CN109571748A - The manufacturing method of concrete prefabricated pipe gallery - Google Patents
The manufacturing method of concrete prefabricated pipe gallery Download PDFInfo
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- CN109571748A CN109571748A CN201811456705.9A CN201811456705A CN109571748A CN 109571748 A CN109571748 A CN 109571748A CN 201811456705 A CN201811456705 A CN 201811456705A CN 109571748 A CN109571748 A CN 109571748A
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- prefabricated pipe
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/04—Producing shaped prefabricated articles from the material by tamping or ramming
- B28B1/045—Producing shaped prefabricated articles from the material by tamping or ramming combined with vibrating or jolting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/08—Producing shaped prefabricated articles from the material by vibrating or jolting
- B28B1/093—Producing shaped prefabricated articles from the material by vibrating or jolting by means directly acting on the material, e.g. by cores wholly or partly immersed in the material or elements acting on the upper surface of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/247—Controlling the humidity during curing, setting or hardening
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/10—Tunnels or galleries specially adapted to house conduits, e.g. oil pipe-lines, sewer pipes ; Making conduits in situ, e.g. of concrete ; Casings, i.e. manhole shafts, access or inspection chambers or coverings of boreholes or narrow wells
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention discloses a kind of manufacturing methods of concrete prefabricated pipe gallery, the maintaining process of progress including casting craft and pouring after, when pouring, to determine at 5-35 DEG C of die plate temperature, Shi Jinhang；After the completion of one-piece casting, the maintenance of prefabricated component is carried out.Stick is made firm by ramming using plug-in type tentatively to vibrate to corner, bottom plate, top plate, then form vibrator, interruption vibration 30S are used, it is sequentially the weak vibration of weak vibration-Qiang Zhen-(based on form vibrator that interruption, which is vibrated, it supplemented by internal vibration stick, vibrates in blanking)；It is combined using steam phase and promotes curing temperature, generated the outlet of steam promotion curing temperature steam pipe using steam generator and be arranged in piping lane bottom, eyelet is uniformly arranged on pipeline, guarantees that temperature is uniform；Steam-cured process according to it is quiet stop, heat up, the process sequence of constant temperature and cooling is conserved.
Description
Technical field
The invention belongs to city integrated piping lane technical field of construction, in particular to a kind of concrete prefabricated pipe gallery
Manufacturing method.
Background technique
Urban Underground pipe gallery has had more than 180 years history, and the country for building piping lane earliest is France, it collects certainly
Water, the pipelines such as communication, electric power, sewage treatment, gas inlet pipe road and heat supply are.But China's major part piping lane
Construction is all made of mode cast-in-place on the spot and carries out, and underground pipe gallery is prefabricated to be in starting stage, workable specification at home
With reference to municipal administration, the specifications such as building, pipeline installation engineering are designed construction, temporarily without perfect design, construction, examination isotactic
Model.Due to being limited by transporting, domestic main piping lane is prefabricated more in the form of Dan Cang and double storehouses, and general 3 meters of production is with down tube
Corridor Fang Han.Three storehouse large size piping lanes, the prefabricated piping lane country that width reaches 10.3 meters are less.
The characteristics of country's Large Underground pipe gallery is all made of cast-in-place mode and constructs at present, cast in situs is: by
The limitation curing condition in place is difficult, and design requirement conserves 14d, and maintenance water consumption is big and maintenance pipeline is inconvenient to lay, scene
Casting concrete quality cannot be guaranteed, and concrete impermeability is good not as good as prefabrication concrete, easily leak, piping lane
Easily there is construction crack, contains body sidewall entire crack etc., product quality is not easy to control, and construction cost is higher.
Summary of the invention
It is an object of the invention to: in view of the above-mentioned problems of the prior art, providing a kind of concrete prefabricated synthesis
The manufacturing method of piping lane, has that product quality is easy to control, and material is controllable, and product cost is more cast-in-place low, short construction period, society
It is profitable, the advantages such as environmental pollution is smaller.
The technical scheme of the present invention is realized as follows: a kind of manufacturing method of concrete prefabricated pipe gallery, the side
Method the following steps are included:
S1: pouring condition detection, and measurement concrete molding temperature summer is 5-35 DEG C before pouring, and winter is 10-35 DEG C,
Die plate temperature is 5-35 DEG C；And environment temperature temperature when pouring is measured, just start to pour when determining environment temperature lower than 35 DEG C；
S2: underplate concrete pours, and is first poured from combustion gas storehouse using gantry crane, hopper and sliding slot, then successively pour comprehensive
Close storehouse and sewage storehouse；Using vibrating head guiding concrete and vibration compacting in casting process, the slump control of concrete exists
Within the scope of 160-200mm；Ensure underplate concrete pour it is closely knit after, in core indoor location bottom cover plate, prevent coagulation in core room
Soil, which turns over, to be gushed；Comprehensive orlop plate and sewage orlop board concrete casting method are consistent with combustion gas storehouse；
S3: web concrete pours, and after the completion of underplate concrete pours, starts to pour web concrete；Web concrete
It pours based on form vibrator, immersion vibrator cooperation is vibrated, and vibrating on the inside of web should extend compared with web outside shakes
Smash the time；
S4: after the completion of one-piece casting, carrying out the maintenance of prefabricated component, and the qualified pipe gallery prefabricated component that completes.
The manufacturing method of concrete prefabricated pipe gallery of the present invention first uses in underplate concrete casting process
50 vibrating head guiding concrete of Φ and vibration compacting, turn over stick using Φ 30 in bottom plate bell and spigot position after vibrating and make firm by ramming,
And after ensuring that bottom plate is made firm by ramming, thickness should be lower than design thickness 5-10mm, can voluntarily fill when web concrete pours.
The manufacturing method of concrete prefabricated pipe gallery of the present invention, the vibrating of web outside answer it is close insert, short vibration,
Diligent vibration, the interval 200mm of insertion point, the insertion depth of vibrating spear should be inserted into 50~100mm of one layer of casting concrete；Every
The junction of wall and bottom plate is vibrated using attached vibrator progress multifrequency time, low frequency, short time, avoids excessively vibrating mixed
Solidifying soil founding.
The manufacturing method of concrete prefabricated pipe gallery of the present invention, after the completion of pouring, timely covering curing
Cover, and enter steam curing shed, and steam curing is carried out using steam generator.
The manufacturing method of concrete prefabricated pipe gallery of the present invention, the steam curing include that the quiet of sequence stops
Stage, temperature rise period, constant temperature stage and temperature-fall period, it is described it is quiet stop the stage, guarantee concrete temperature not less than 10 DEG C
It rests under environment temperature, the temperature rise period is entered after resting 4 hours.
The manufacturing method of concrete prefabricated pipe gallery of the present invention, in the temperature rise period, heating rate is per small
When be no more than 10 DEG C.
The manufacturing method of concrete prefabricated pipe gallery of the present invention, in the constant temperature stage, steam curing shed inner loop
Border temperature is not higher than 50 DEG C, not more than 65 DEG C of concrete core.
The manufacturing method of concrete prefabricated pipe gallery of the present invention, constant temperature time is 8-10 hours, later per small
When check the intensity and temperature of concrete, be allowed for access temperature-fall period after the intensity of concrete reaches lifting intensity.
The manufacturing method of concrete prefabricated pipe gallery of the present invention, in temperature-fall period, cooling rate is per hour not
More than 10 DEG C, can be demoulded when concrete core is respectively less than 15 DEG C with the surface layer temperature difference, surface layer and circumstance of temperature difference.
The manufacturing method of concrete prefabricated pipe gallery of the present invention, piping lane inner cavity, top surface coagulation before piping lane demoulds
The relative air humidity of soil and air contact portion will ensure to cannot be below 80%, if being lower than 80%, need to carry out watering moisturizing
Maintenance, maintenance water temperature and piping lane surface temperature difference are not more than 15 DEG C.
The invention has the benefit that the prefabricated early strength for taking measures to improve concrete of pipe gallery improves
The turnaround speed of template so that concrete reaches lifting intensity as early as possible, and can carry out pouring construction, by environment in winter
The influence of temperature is smaller.Steam curing is carried out using steam generator, can be demoulded in 20 hours, model turnover is improved
Speed has been saved the duration, and can ensure that concrete peripheral temperature and humidity are met the requirements；Waste residue, exhaust gas and noise will not be generated
Deng to more environment-friendly.
Detailed description of the invention
Fig. 1 is the schematic diagram of pipe gallery prefabricated component of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments,
The technology of the present invention is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain this
Invention, is not intended to limit the present invention.
It is as shown in Figure 1 the schematic diagram of pipe gallery prefabricated component of the invention, wherein 1 is bottom plate, 2 be web, and 3 be top
Plate, 4 be combustion gas storehouse, and 5 be comprehensive storehouse, and 6 be sewage storehouse.
The casting craft of piping lane concrete: being poured using horizontal, and feature is that A1 type piping lane height is 3.6 meters, width
It is 10.3 meters, centre is divided into three warehouses, and comprehensive storehouse, combustion gas storehouse, sewage storehouse, three storehouse partition wall thicknesses are 30cm.From structure
Feature can be seen that pouring order of concrete and pour time control by be piping lane concrete research emphasis.
Concreting process are as follows: pour preceding preparation, pour combustion gas orlop plate, pouring synthetic orlop plate pours sewage storehouse
Bottom plate symmetrically pours web, pours top plate, carries out steam curing.
Vibrating head and side form dither is wanted to combine and vibrate during pouring.Dither is each
The vibration time is 20-30s, is vibrated using the intermittent vibrator that starts.
Wherein, preceding preparatory process is poured are as follows: appraised and decided operator in place, related equipment has installed.Quality inspection personnel
Temperature when measurement pours at that time guarantees to be poured when environment temperature temperature is lower than 35 DEG C.The slump control of concrete
System, if considering the loss amount of concrete slump when temperature is higher, properly increases Control Measures for Concrete Slump within the scope of 160-200mm
Degree.The molding temperature for paying attention to measuring concrete, measures the presetting period of concrete.
Concreting
Underplate concrete, which is poured, to be poured using gantry crane+hopper+sliding slot from combustion gas storehouse, and Φ 50 is used in casting process
Vibrating head guiding concrete and vibration compacting, turn over stick using Φ 30 in bottom plate bell and spigot position after vibrating and make firm by ramming, bottom plate
Making rear thickness firm by ramming can should voluntarily fill when web concrete pours lower than design thickness 5-10mm.Comprehensive orlop plate and sewage storehouse
Underplate concrete casting craft is consistent with combustion gas storehouse.
Ensure underplate concrete pour it is closely knit after, in core indoor location bottom cover plate, prevent core indoor concrete from turning over and gush.
The time of cover board must not exceed the presetting period for pouring combustion gas storehouse concrete at first, and the purpose of cover board is to allow concrete to exist
During pouring partition wall and side wall, concrete is turned over because of gravity pressure and exciting force to be gushed.
After the completion of underplate concrete pours, start to pour web concrete.Web concrete pours vibrator as a plug
It vibrates with form vibrator cooperation, it is noted that outside in web is divided to vibrate when web vibrates, the Ying Yimi that vibrates of web outside
Slotting, short vibration, diligent vibration are advisable, and vibrating on the inside of web should be compared with lateral vibrating time.The interval 200mm of insertion point, vibrating spear
Insertion depth should be inserted into 50~100mm of one layer of casting concrete.Pay attention to slightly being twitched up and down in favor of row when vibrating
Gas.When web vibrates, hand must not be removed after vibrating spear insertion concrete regardless of or vibrating spear being attached to outboard template and is vibrated.Socket joint
Mouth position must make stick firm by ramming with Φ 30 and make firm by ramming.The junction of partition wall and bottom plate carries out multifrequency time, low frequency using attached vibrator
Rate, short time vibrate, and avoid excessive vibrated concrete founding.
In the case with the template of hand hammer or other tools tapping web, judge whether concrete is closely knit by sound, when out
When existing hollowing sound, it should be replenished in time and vibrate, it is ensured that concrete compaction.When pouring piping lane concrete, special messenger is arranged to be responsible for inspection
Template situation is looked into, timely processing of finding the problem, what cannot be handled will contact technician's processing in time.
The maintaining process of pipe gallery prefabricated component:
Pipe gallery is prefabricated to have biggish difference with cast-in-place maintenance.Cast-in-place concrete maintenance is generally supported using watering nature
Shield, water source deposit is not easy and pipe arrangement is difficult, and the time of maintenance is longer, and the template and bracket of occupancy are more, when template is had enough to meet the need
Between it is longer, and cast-in-place be unfavorable for winter construction.And the prefabricated early strength for taking measures to improve concrete of pipe gallery
The turnaround speed for improving template, so that concrete reaches lifting intensity as early as possible.
Maintenance record statistics is produced according to piping lane early period, 18 hours concrete of steam curing are average with condition test piece intensity
It can reach 41.3MPa, meet design lifting intensity requirement.
Specific steam curing arrangement and method for construction is as follows:
1. after the completion of pouring, timely covering curing cover (uses other temperature-boosting measures using steam generator when necessary
Cooperation) steam curing is carried out, carry out monitoring temperature record.
2. the prefabricated phase of piping lane is summer, at 20 DEG C or more, steam curing can make to conserve temperature of shed outdoor mean temperature
Reach 48 DEG C or more.When winter construction environment temperature is lower, the heating of hot wind big gun auxiliary can be increased in maintenance canopy or increased and steamed
The heating of vapour generator quantity.
3. quiet stop the stage: guaranteeing that concrete temperature is rested under the environment temperature not less than 10 DEG C, rest 4 hours
Enter the temperature rise period afterwards.The stage of resting should cover steam curing shed in time, and solar exposure or wind is avoided to lead to concrete water evaporation
It is too fast, occur dry and cracked.
4. the temperature rise period: heating rate is no more than 10 DEG C per hour.
5. the constant temperature stage: quickly to improve concrete strength, general steam curing environment temperature should not be greater than 50 DEG C,
Concrete core highest is no more than 65 DEG C, and the thermostatic curing time is depending on piping lane concrete strength growth pattern.In constant temperature 8
After hour, the intensity and temperature of concrete need to be checked per hour, drop of being allowed for access after the intensity of concrete reaches lifting intensity
Thermophase is general between constant temperature time 8-10 hours.
6. temperature-fall period: when being connected to cooling notice, health thermometric personnel can start gradually to lower to be discharged into quantity of steam
Method cools down, and cooling rate is no more than 10 DEG C per hour, when concrete core and the surface layer temperature difference, surface layer and circumstance of temperature difference
It can be demoulded when less than 15 DEG C.Thermometric number: primary, stage temperature rise period and temperature-fall period were surveyed within the stage in stage of resting every 1 hour
It surveys within every 0.5 hour once, surveyed within the constant temperature stage every 1 hour primary.
7. the relative air humidity of piping lane inner cavity, top surface concrete and air contact portion will ensure not before piping lane demoulds
80% can be lower than.If being lower than 80%, watering moisture-keeping maintaining is carried out, and conserves water temperature and piping lane surface temperature difference no more than 15
℃。
In the present embodiment, the steam-cured experiment in 2-section pipe corridor has been carried out altogether, and first segment piping lane steam curing uses
Two steam generators gas supply, 20 DEG C of outdoor temperature, be 6 hours between the quiet stopping time, and thermostat temperature is 38 DEG C, from being warming up to constant temperature,
Cooling is arrived again finishing the time and used altogether 30 hours, the intensity of concrete is 40MPa.Wherein in maintenance processes, examine within 12 hours
The intensity 29.8MPa of concrete is surveyed.
Second section piping lane steam curing is using four steam generator gas supply, 25 DEG C of outdoor temperature, quiet to stop 4 hours, constant temperature
48 DEG C of temperature, from cooling steam-cured 18 hours 20 points altogether are warming up to, concrete strength reaches 42MPa.
Steam curing conclusion: steam curing is to improve the critical process of concrete strength growth rate.Two steam generations
Device can guarantee that maintenance canopy temperature reaches 40 degree or so, and at steam curing 30 hours, concrete strength can reach 39.8MPa.Four
Platform steam generator works at the same time, it is ensured that steam curing temperature of shed can be protected in 24 hours between 45 DEG C -50 DEG C
The intensity of card concrete can reach 80% or more of design requirement intensity, meet lifting requirements.
Sprinkling maintenance: the sprinkling maintenance in steam-cured stage is only to improve maintenance humidity, and the sprinkling maintenance after proposing pedestal is main
Condition is provided for later strength growth.After product proposes pedestal, intensity only reaches the 80% of design strength, need to carry out watering and support
Protect 14d, it is ensured that reach design strength；After piping lane storage, geotextiles are covered in top surface, human assistance sprinkling maintenance, in case and abdomen
Plate uses automatic sprinkler fire-extinguishing system spray maintenance.
The characteristics of pipe gallery preform product made in the present embodiment, is as follows:
Product outline size: piping lane length 2m, width 10.3m, height 3.6m, comprehensive 4 × 3 meters of storehouse, combustion gas storehouse 1.8 ×
3m, 3.3 × 3m of sewage storehouse, piping lane wall thickness 0.3m.
Structure type: common waterproof concrete structure.
Built-in fitting form: 20 reinforcing bar load-bearing earth anchor of Φ, 40 × 40cm steel plate, 60 × 60cm steel plate, 60 × 15cm steel plate,
20 × 20cm steel plate, waterproof copper plate, 10 × 10cm are grounded steel plate, 14 bar planting of Φ.
Quality requirement: city integrated piping lane is designed as bell and spigot connection, and bell and spigot position dimension required precision is not more than
2mm。
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within principle.
Claims (10)
1. a kind of manufacturing method of concrete prefabricated pipe gallery, it is characterised in that: the described method comprises the following steps:
S1: pouring condition detection, and measurement concrete molding temperature summer is 5-35 DEG C before pouring, and winter is 10-35 DEG C, template temperature
Degree is 5-35 DEG C；And environment temperature temperature when pouring is measured, just start to pour when determining environment temperature lower than 35 DEG C；
S2: underplate concrete pours, and is first poured from combustion gas storehouse using gantry crane, hopper and sliding slot, then successively pouring synthetic storehouse
With sewage storehouse；Using vibrating head guiding concrete and vibration compacting in casting process, the slump of concrete is controlled in 160-
Within the scope of 200mm；Ensure underplate concrete pour it is closely knit after, in core indoor location bottom cover plate, prevent core indoor concrete from turning over
It gushes；Comprehensive orlop plate and sewage orlop board concrete casting method are consistent with combustion gas storehouse；
S3: web concrete pours, and after the completion of underplate concrete pours, starts to pour web concrete；Web concrete pours
Based on form vibrator, immersion vibrator cooperation is vibrated, when vibrating on the inside of web should vibrate compared with web outside extension
Between；
S4: after the completion of one-piece casting, carrying out the maintenance of prefabricated component, and the qualified pipe gallery prefabricated component that completes.
2. the manufacturing method of concrete prefabricated pipe gallery according to claim 1, it is characterised in that: underplate concrete pours
First using 50 vibrating head guiding concrete of Φ and vibration compacting during building, Φ is used in bottom plate bell and spigot position after vibrating
30, which turn over stick, makes firm by ramming, and after ensuring that bottom plate is made firm by ramming, and thickness should be lower than design thickness 5-10mm, can be voluntarily when web concrete pours
Filling.
3. the manufacturing method of concrete prefabricated pipe gallery according to claim 2, it is characterised in that: the vibration of web outside
It smashes and answers close slotting, short vibration, diligent vibration, the interval 200mm of insertion point, the insertion depth of vibrating spear should be inserted into one layer of casting concrete
50~100mm；The junction of partition wall and bottom plate is vibrated using attached vibrator progress multifrequency time, low frequency, short time, is avoided
Excessive vibrated concrete founding.
4. the manufacturing method of concrete prefabricated pipe gallery according to claim 1, it is characterised in that: completed pouring
Afterwards, timely covering curing cover, and enter steam curing shed, and steam curing is carried out using steam generator.
5. the manufacturing method of concrete prefabricated pipe gallery according to claim 4, it is characterised in that: the steam curing
Quiet including sequence stops stage, temperature rise period, constant temperature stage and temperature-fall period, it is described it is quiet stop the stage, guarantee concrete temperature
It rests under the environment temperature not less than 10 DEG C, the temperature rise period is entered after resting 4 hours.
6. the manufacturing method of concrete prefabricated pipe gallery according to claim 5, it is characterised in that: in the heating rank
Section, heating rate are no more than 10 DEG C per hour.
7. the manufacturing method of concrete prefabricated pipe gallery according to claim 6, it is characterised in that: in the constant temperature rank
Section, steam curing shed interior environment temperature are not higher than 50 DEG C, not more than 65 DEG C of concrete core.
8. the manufacturing method of concrete prefabricated pipe gallery according to claim 7, it is characterised in that: constant temperature time 8-
It 10 hours, checks the intensity and temperature of concrete per hour later, is allowed for access after the intensity of concrete reaches lifting intensity
Temperature-fall period.
9. the manufacturing method of concrete prefabricated pipe gallery according to claim 8, it is characterised in that: in temperature-fall period,
Cooling rate is no more than 10 DEG C per hour, when concrete core and the surface layer temperature difference, surface layer and circumstance of temperature difference are respectively less than 15 DEG C of when sides
It can demould.
10. the manufacturing method of concrete prefabricated pipe gallery according to claim 9, it is characterised in that: before piping lane demoulding
The relative air humidity of piping lane inner cavity, top surface concrete and air contact portion will ensure to cannot be below 80%, if be lower than
80%, watering moisture-keeping maintaining need to be carried out, maintenance water temperature and piping lane surface temperature difference are not more than 15 DEG C.
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| CN113021598A (en) * | 2021-03-11 | 2021-06-25 | 江苏和天下节能科技股份有限公司 | Preparation method of environment-friendly high-durability prefabricated member of underground comprehensive pipe gallery |
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Address after: Qinghua East Road in Qingbaijiang District of Chengdu City, Sichuan Province, No. 173 610300 Applicant after: No.7 Engineering Co., Ltd. of China Railway No.8 Engineering Group Co., Ltd Address before: Qinghua East Road in Qingbaijiang District of Chengdu City, Sichuan Province, No. 173 610300 Applicant before: BRIDGE ENGINEERING COMPANY OF CHINA RAILWAY NO.8 ENGINEERING GROUP Co.,Ltd. |
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