CN114673159A

CN114673159A - Concrete heat preservation construction method for winter construction

Info

Publication number: CN114673159A
Application number: CN202210491991.2A
Authority: CN
Inventors: 陈继祥; 张泽; 秦庆彬; 马忠海; 王寅飞
Original assignee: Huaneng Hegang Power Generation Co ltd
Current assignee: Huaneng Hegang Power Generation Co ltd
Priority date: 2022-05-07
Filing date: 2022-05-07
Publication date: 2022-06-28

Abstract

The invention relates to the technical field of wind power project construction, and particularly discloses a concrete heat preservation construction method for winter construction, which comprises the following five steps: firstly, the method comprises the following steps: heating and insulating the concrete before the concrete is molded, and ensuring the molding temperature and the curing temperature of the concrete; II, secondly: before concrete is stirred, a roller of the stirrer needs to be cleaned by water and continuously operated until internal sundries are cleaned; thirdly, the method comprises the following steps: after the concrete is stirred, detecting the discharge temperature of the concrete, and heating the concrete by adopting a water heating method when the discharge temperature of the concrete is lower than 10 ℃; fourthly, the method comprises the following steps: after the concrete is discharged, the temperature of the concrete is detected before the concrete is fed into a mold, and when the temperature of the concrete fed into the mold is detected to be lower than 5 ℃, the concrete also needs to be heated; fifthly: after pouring is finished, the top surface needs to be covered with a film in a moisture-preserving mode, and the opening of the foundation pit is covered by the tarpaulin, so that the problem that concrete is easy to freeze when the concrete construction is carried out on the wind power project in an extremely cold area in the prior art is solved.

Description

Concrete heat-preservation construction method for winter construction

Technical Field

The application relates to the technical field of wind power project construction, and particularly discloses a concrete heat preservation construction method for winter construction.

Background

The construction of the wind power project is carried out in the extremely cold region, because the days of extremely cold climate are longer in winter construction at the engineering location, the winter construction period of the engineering is from 11 months last to 5 months next year, the construction progress is influenced by factors such as insufficient construction experience in the extremely cold weather, south-north climate and regional difference, and when the wind power project is constructed in a concrete foundation pit in the environment,

the phenomenon of freezing is very easy to occur in the stirring construction process, so that the construction is difficult.

Accordingly, the present inventors have made an effort to provide a concrete heat preservation construction method for winter construction in order to solve the above problems.

Disclosure of Invention

The invention aims to solve the problem that concrete is easy to freeze when concrete construction is carried out on a wind power project in an extremely cold area.

In order to achieve the above object, a basic aspect of the present invention provides a concrete heat-insulating construction method for winter construction, including the steps of:

step S001: heating and insulating the concrete before the concrete is put into a mold, and ensuring the mold-putting temperature and the curing temperature of the concrete;

step S002: before concrete is stirred, a roller of the stirrer needs to be cleaned by water and continuously operated until internal sundries are cleaned;

step S003: after the concrete is stirred, detecting the discharge temperature of the concrete, and heating the concrete by adopting a water heating method when the discharge temperature of the concrete is lower than 10 ℃;

step S004: after the concrete is discharged, the concrete is fed into a mold in time, the temperature of the concrete is detected before the concrete is fed into the mold, and when the temperature of the concrete fed into the mold is detected to be lower than 5 ℃, the concrete also needs to be heated;

step S005: after pouring is finished, a film is needed to be used for moisturizing and covering the top surface, the opening of the foundation pit is covered through tarpaulin, and concrete is maintained.

Further, in step S002, the stirring time per tank of concrete was 135 seconds.

Further, in step S003, the temperature at which water is heated is 50 to 80 ℃.

Further, in step S003, the concrete may be heated by building a coal furnace in the foundation pit.

Further, in step S003, when the discharge temperature and the mold-entering temperature of the concrete still do not satisfy the requirements after the heating method is used for heating, the mold-entering temperature of the concrete can be ensured by adding the heating sand and the stone.

Furthermore, a stir-frying table which is formed by erecting angle steel, steel plates and steel pipes is used for stir-frying the sand and the stone.

Further, in step S002, the washing of the stirrer should be continued for 10 to 20 minutes.

Further, in step S003, the feeding sequence during concrete mixing is as follows: water, broken stone, sand and cement.

Further, in step S005, the curing method of the concrete is completed by a heating method.

Further, the heating method comprises the following steps:

step A001: the top surface of the foundation is covered by a film moisture-preserving cover, and the pithead is covered by tarpaulin;

step A002: the top surface of the foundation and other parts which are easy to be frozen are padded with heat insulation cotton, and the tarpaulin is covered with heat insulation materials such as the heat insulation cotton;

step A003: the temperature is raised by heating with a coal stove or a stove in a pit.

The principle and effect of this basic scheme lie in:

1. the invention heats and preserves the temperature of the concrete mould, and ensures that the concrete can not be excessively adhered to the template due to the over-low temperature of the template when the concrete enters the mould.

2. The invention cleans impurities in the mixer roller before mixing, mainly removes snow and frost, prevents water content increase caused by mixing of concrete into the snow or the frost in the mixing process, and also can prevent the temperature from being too low due to the influence of the snow and the frost.

3. The invention can heat by heating water, coal stove and sand stone and stone, to confirm the concrete not easy to freeze.

4. The invention can keep the temperature by a heating and temperature raising method after the concrete pouring is finished, and prevent the concrete from being frozen too fast to finish the solidification.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 shows a flow chart of a concrete heat preservation construction method for winter construction according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The following is further detailed by the specific embodiments:

a concrete heat preservation construction method for winter construction, the method is directed at carrying on the fan installation construction in the extremely cold area and proposing;

carry out the fan installation in extremely cold area, at first need survey the job site, according to surveying the result, adopt deep well precipitation construction to the foundation ditch of job site, according to surveying the result, pointed increase light well point, through deep well and light-duty looped netowrk pipe joint precipitation construction, following be two kinds of precipitation construction process flows:

the main process of the single deep well construction is as follows: firstly, measuring, paying off and positioning, then digging a deep pit and putting down a protective cylinder, putting down a drilling machine, positioning the drilling machine, drilling holes through the drilling machine, installing filter pipes in the drilled holes, filling filter materials, cleaning the inner cavity of the holes, installing a water pump, trying to pump water, and operating the water pump after the water pumping is successful;

the construction process of the light well point comprises the following steps: firstly, setting out line and positioning, drilling a well hole, burying a well point pipe after the well hole is finished, installing a main pipe, and communicating the well point pipe with the main pipe by using a bent connecting pipe;

in a construction site, a foundation pipe pile adopts a composite prefabricated pipe, the foundation pipe pile adopts a patent technology composite prefabricated pipe pile, a composite pile construction process is prefabricated by drilling, and a composite prefabricated pile is constructed by adopting a novel patent technology of the composite prefabricated pile, so that time and working strength are saved;

in foundation pile foundation construction field, drop into 4 rigs and corollary equipment and carry out the operation, 36 work piles in every basic position, 7 experimental piles, 22 piles of construction at least are guaranteed every day to the rig, and cement is in time gone into the field and is done the sample and send out the inspection work, site operation machinery: each pump station is provided with 3 cement paste mixers, 2 cement paste pumps, 2 water tanks and 3 water pumps for preparing and pumping cement paste;

after drilling by a drilling machine, starting a hole forming process, wherein the process comprises the following steps:

during construction, the drill nozzle is tightly blocked, so that sand and soil are prevented from entering the grout spraying hole in the drilling process to block a cement slurry conveying pipeline; wherein, the drilling speed of the drilling machine needs to be stable, after the drilling machine drills to the elevation of the designed hole bottom, a grouting pump is started to perform grouting in the hole, the grouting pressure is controlled to be 3-5MPa, and then grouting is started;

when grouting is started, the drilling tool rotates at the bottom of a hole for a period of time, then grouting is carried out while lifting, but the drill bit is guaranteed to be buried in cement paste for not less than 2m, the drill bit cannot be lifted out of a grouting surface, grouting is stopped when the cement paste surface reaches a position which is enough to support the stability of the hole wall and exceeds the underground water level by 0.5-1.0 m, the grouting amount is recorded, and the tubular pile can be placed after grouting is finished;

need carry out the closely knit process of benefit thick liquid after the tubular pile installation is accomplished, the process step is as follows:

after the tubular pile is fixed, a slurry supplementing worker puts a slurry supplementing pipe; the first slurry supplement, namely arching water and impurities in the pile out of the pile; after the grout is replenished for many times, when the grout is full and no longer permeates and is not less than 50cm higher than the elevation of the pile top, under the condition of approval of a field technician, the grout replenishing can be stopped, the short grout replenishing pipe is pulled out, and the grout replenishing amount is recorded;

wherein, the slurry supplementing pressure is controlled to be 0.5-3 Mpa, and the slurry supplementing and compacting process is finished before the initial setting of the cement slurry;

for cement required by slurry supplement, the stirring process comprises the following steps:

the cement adopts P.O42.5, and the water cement ratio is controlled to be 0.6; the cement paste is checked regularly, the water cement ratio is allowed to be used only when meeting the requirements, and water and cement are added in a given amount strictly according to the technical requirements; the cement slurry is filtered by a screen, stored in a slurry storage tank and sent to a specially assigned person for stirring to prevent sedimentation, and the storage time does not exceed the initial setting time of the cement;

in the above, for the non-winter construction scheme, the winter construction method of the present invention is proposed as follows:

the winter construction method provided by the invention is based on the fan installation area, and because the duration of extremely cold weather in winter construction at the location of the installed area can be as long as half a year, the construction is difficult by adopting a common method, so that a concrete heat preservation construction method for winter construction needs to be formulated;

before the method is implemented, winter construction preparation needs to be made, and the winter construction preparation comprises the following steps: arranging a construction plan during winter construction, defining winter construction projects, implementing a contract unit and urging the contract unit to make various preparation works according to requirements;

the preparation work before construction comprises technical preparation work and material preparation work;

wherein the technical preparation work comprises: before winter construction, technicians at the project department compile winter construction material plans, winter construction operation heat preservation measures, temperature measuring point arrangement and the like in advance, and carry out technical intersection and safety intersection of winter construction project on field managers and constructors at all levels;

training quality inspectors, material operators, safety operators and constructors is strengthened before winter construction, the norms, regulations and regulations related to winter construction are learned, specific project winter construction methods and winter construction measures are learned, temperature measurement projects, temperature measurement interval time, use of temperature measurement instruments, heat preservation measures of a mixing station, finished product protection of each project in winter and the like are determined;

the number of on-site temperature measuring personnel is not less than 2, the continuous temperature measurement is carried out for 24 hours, the highest and lowest thermometers are adopted for measuring the atmospheric temperature, the glass liquid thermometers and the electronic thermometers are adopted for measuring the temperature of various raw materials and the curing temperature of concrete, and the various thermometers are required to be checked, measured and registered before being used.

Wherein the material preparation comprises: fire-proof heat-insulating materials used in winter are stored properly according to planned use amount, specification, model and quality requirements to prevent damage and waste;

organizing the work of materials, equipment sources, incoming inspection and acceptance in winter;

preparing a heating facility, preparing a CO alarm, and protecting raw materials and semi-finished products;

for damp-proof materials such as templates, battens and the like, moisture-proof measures are taken, the materials are covered by color strip cloth when necessary, and the stacking positions of the templates need to be padded up and stacked and well ventilated;

the piling of the reinforcing steel bars needs to be padded with battens to prevent snow water from soaking;

the steel pipes are orderly stacked, the antirust paint is brushed, a fastener room is erected when the fasteners are stored, the fasteners are cleaned in time and put into a warehouse after being turned off, the fireproof cotton curtain, a temperature measuring instrument and other materials required by winter construction are completely prepared according to a plan, a specially-assigned person is arranged to take care of, easily-damaged articles are found out, the damages are repaired or updated immediately, and inflammable articles are stacked, stored and provided with the warehouse and the specially-assigned person to take care of;

besides the material preparation work and the technology preparation work, the heat preservation work of a pipeline water outlet, a fire-fighting pipeline and an exposed water pipe for water supply and drainage on site is needed, and a winter construction leader group performs one-time comprehensive inspection and implementation on each preparation work of a construction site to ensure the normal construction of winter construction;

arranging a specially-assigned person to uniformly carry out related temperature measurement work such as atmospheric temperature measurement and the like, and recording the temperature measurement work;

a bracket is additionally arranged at the lower part of a distribution box of mechanical equipment, a protective shed is arranged at the upper part of the distribution box to prevent snow and damp, and a grounding protection device is arranged;

before winter, carefully checking electric equipment and tools such as an on-site distribution box, a brake box, a cable temporary support, an electric welding machine and the like, timely reinforcing the electric equipment and tools needing reinforcing, timely filling up a gap cover, a cover and a door, preventing snow and moisture, ensuring the electric safety, and discharging water in a water tank after the on-site machinery is used;

and a normal heat insulation shed is erected on the concrete delivery pump, and the pump pipe is insulated by 50-thick rock wool and is fastened by winding cloth outwards.

The method for constructing the concrete in winter can be implemented after preparation work is finished before winter construction, and the method comprises the following basic steps:

step S001: heating and insulating the concrete before the concrete is molded, and ensuring the molding temperature and the curing temperature of the concrete;

step S002: before the concrete is stirred, the roller is washed by water and is operated for 10 minutes, residues such as frost, ice, snow and the like in the roller are washed clean, and then the concrete is mixed;

In the step S003, the feeding sequence during the concrete mixing is as follows: water-crushed stone-sand-cement;

and in the step S002, the stirring time of each tank of concrete is at least 135 seconds;

when the step S003 is implemented, a coal stove can be used for heating the concrete mixture in a construction site, and when the discharging temperature and the mold-entering temperature of the concrete after the concrete is stirred by heated water cannot meet the requirements, a method for heating sand and stone is needed to ensure the mold-entering temperature of the concrete, wherein the temperature for adding the sand is not more than 65 ℃;

and when the step S003 is carried out, the highest temperature of water heating is 80 ℃;

when the method of heating the sand and the stone is adopted to ensure the mold-entering temperature of the concrete, the work of stir-frying the sand and the stone is required, a stir-frying table is required to be erected for the stir-frying of the sand and the stone, the stir-frying table is firmly erected by using angle steel, steel pipes and steel plates, and the weight of 2-3 disks of sand or stone for the concrete can be borne;

after each outdoor foundation is poured, timely collecting slurry and plastering, covering the top surface of the foundation with a film for moisturizing, tightly covering the whole pithead with tarpaulin, and tightly pressing the periphery with stones or earth;

in step S005, the cast-in-place foundation is maintained mainly by heating and raising the temperature, namely, after the cast-in-place foundation is covered with a film for keeping moisture, the pit opening is covered tightly by tarpaulin, and heat-preservation cotton and other objects are additionally arranged at the parts which are easy to freeze, such as the top surface of the foundation, and the like, and the tarpaulin is covered with heat-preservation cotton and other heat-preservation objects, the compaction thickness of the tarpaulin is not less than 0.3m, the tarpaulin is away from the top surface of the foundation by more than 300mm when being covered, so as to avoid frosting and freezing the top surface of the foundation, and the cast-in-place foundation is maintained by heating by a coal stove or heating by a raw furnace in the pit.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims

1. A concrete heat preservation construction method for winter construction is characterized by comprising the following steps:

2. The concrete thermal insulation construction method for winter construction according to claim 1, wherein in the step S002, the mixing time per tank of concrete is 135 seconds.

3. The concrete thermal insulation construction method for winter construction according to claim 1, wherein the water is heated at a temperature of 50-80 ℃ in the step S003.

4. The concrete heat preservation construction method for winter construction as claimed in claim 1, wherein in step S003, the concrete is further heated by building a coal stove in the pit.

5. The concrete heat preservation construction method for winter construction as claimed in claim 1, wherein in step S003, when the discharging temperature and the molding temperature of the concrete still fail to satisfy the requirements after heating by heating, the molding temperature of the concrete can be ensured by adding heating sand and stone.

6. The concrete heat preservation construction method for winter construction as claimed in claim 5, wherein a stir-fry platform constructed by angle steel, steel plate and steel pipe is used for stir-frying sand and stone.

7. The concrete heat preservation construction method for winter construction as claimed in claim 1, wherein the washing of the mixer should last for 10-20 minutes at step S002.

8. The concrete thermal insulation construction method for winter construction according to any one of claims 3 to 6, wherein in the step S003, the concrete is mixed in a feeding sequence of: water, broken stone, sand and cement.

9. The concrete thermal insulation construction method for winter construction according to claim 1, wherein the curing method of the concrete is performed by a heating method in step S005.

10. The concrete heat preservation construction method for winter construction according to claim 9, wherein the heating and warming method comprises the steps of:

step A001: covering the top surface of the foundation by a film moisture-preserving layer, and covering the pithead by tarpaulin;