CN102182866B - Backfilling process for large ultra-deep circulating water pipe - Google Patents
Backfilling process for large ultra-deep circulating water pipe Download PDFInfo
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- CN102182866B CN102182866B CN2011100736543A CN201110073654A CN102182866B CN 102182866 B CN102182866 B CN 102182866B CN 2011100736543 A CN2011100736543 A CN 2011100736543A CN 201110073654 A CN201110073654 A CN 201110073654A CN 102182866 B CN102182866 B CN 102182866B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000004567 concrete Substances 0.000 claims abstract description 54
- 239000004576 sand Substances 0.000 claims abstract description 48
- 238000010276 construction Methods 0.000 claims description 23
- 238000005056 compaction Methods 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 9
- 238000012360 testing method Methods 0.000 claims description 8
- 238000009415 formwork Methods 0.000 claims description 7
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 6
- 239000000758 substrate Substances 0.000 claims description 6
- 238000009412 basement excavation Methods 0.000 claims description 4
- 238000012937 correction Methods 0.000 claims description 4
- 210000000115 thoracic cavity Anatomy 0.000 claims description 4
- 230000007935 neutral effect Effects 0.000 claims description 3
- 238000009416 shuttering Methods 0.000 claims description 3
- 239000004575 stone Substances 0.000 abstract description 17
- 230000007797 corrosion Effects 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 5
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- 241000196324 Embryophyta Species 0.000 description 5
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- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
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Abstract
The invention discloses a backfilling process for a large ultra-deep circulating water pipe, comprising the steps of: (1) constructing a sand bedding layer, wherein the sand bedding layer is 1000-1500 mm in thickness and is made of moderate-coarse sand and coarse sand; (2) covering the pipe by using concrete, wherein the concrete layer is 4000-5500 mm in thickness; and putting a circulating water pipe on the sand bedding layer; (3) backfilling: paving a stone chip layer on the concrete layer, wherein each backfilling layer is less than or equal to 500 mm in thickness, the compactedness is more than 90%, and the total thickness of the stone chip layer is 3000-4500 mm; paving a macadam layer on the stone chip layer, wherein the maximum grain size of the macadam is not more than 100 mm, each backfilling layer is less than or equal to 500 mm in thickness, the compactedness is more than 85%, and the macadam layer is 4000-6000 mm in thickness. By use of the backfilling process, the anticorrosion performance of the large ultra-deep circulating water pipe can be improved so that the pipe can be effectively prevented from corrosion for the service life of 60 years.
Description
Technical field
The invention belongs to a kind of circulating water pipeline backfilling process.
Background technique
The circulating water pipeline engineering is located in the field, is open work, and long construction period needs exceedingly odious weathers such as freezing severe cold of experience summer high temperature and typhoon, winter, and backfill brings a lot of difficulty to pipeline; Pipeline need pass through the different geological layer, and pool slag backfill layer, mud, horizon d are arranged, and the pipeline ground is various informative.
For large-scale pipeline, especially the circulating water pipeline in the power station adopts common backfilling process, can not satisfy at least 60 years life-spans of pipeline corrosion protection.
Summary of the invention
The deficiency relatively poor for the antiseptic property that overcomes existing circulating water pipeline backfilling process, that working life is short, the present invention provides a kind of and promotes antiseptic property, effectively guarantees that pipeline corrosion protection reaches the large-scale ultra dark circulating water pipeline backfilling process in 60 year life-span.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of large-scale ultra dark circulating water pipeline backfilling process, said backfilling process may further comprise the steps:
(1) sand bedding course construction:
Sand bedding course thickness 1000～1500mm, material are medium coarse sand and coarse sand, and work progress is: measure substrate absolute altitude → foundation trench and check and accept and receive → emit sideline → blanking → pave and share → sprinkle water afterwards with plate pulsator ram-jolt → sand degree of compaction sampling test;
(2) concrete is assured
The thickness of said concrete layer is 4000～5500mm, and circulating water pipeline is placed on the sand bedding course, and work progress is: appearance check and correction → concrete shuttering panel making → formwork reinforcing → concrete blanking → examination → form removal is checked → turned over to axis, absolute altitude;
(3) backfill
On said concrete layer, lay the aggregate chips layer, every layer of backfill thickness≤500mm, degree of compaction reaches more than 90%, and the total thickness of aggregate chips layer is 3000～4500mm;
On said aggregate chips layer, lay macadam, the maximum particle diameter of rubble is not more than 100mm, every layer of backfill thickness≤500mm, and degree of compaction reaches more than 85%, and the thickness of said macadam is 4000～6000mm.
Further, in said step (2), concrete layer is provided with the expansion joint one along the per 20～30m of circulating water pipeline direction, and the wide 20mm in expansion joint separates with the pitch board slot.
Further again; In said step (3); The process of aggregate chips layer or macadam blanking: utilize the direct blanking of extension arm excavator, 15 meters of extension arm digging machine armed lever length overalls are in the blanking of foundation ditch both sides; With aggregate chips or rubble directly down to the pipeline top, earlier by dividing to the four sides by manual work again in excavator blanking to the foundation ditch.
Further, in said step (3), the process of aggregate chips layer or macadam blanking: the place, thoracic cavity sets up a chute between excavation slope neutral position and pipeline, utilizes machinery blanking in chute again.
Beneficial effect of the present invention mainly shows: promote antiseptic property, effectively guarantee that pipeline corrosion protection reaches 60 year life-span.
Description of drawings
Fig. 1 is the schematic representation of large-scale ultra dark circulating water pipeline backfill structure;
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
With reference to Fig. 1, a kind of large-scale ultra dark circulating water pipeline backfilling process, said backfilling process may further comprise the steps:
(1) sand bedding course construction:
Sand bedding course thickness 1000～1500mm, material are medium coarse sand and coarse sand, and work progress is: measure substrate absolute altitude → foundation trench and check and accept and receive → emit sideline → blanking → pave and share → sprinkle water afterwards with plate pulsator ram-jolt → sand degree of compaction sampling test;
(2) concrete is assured
The thickness of said concrete layer is 4000～5500mm, and circulating water pipeline is placed on the sand bedding course, and work progress is: appearance check and correction → concrete shuttering panel making → formwork reinforcing → concrete blanking → examination → form removal is checked → turned over to axis, absolute altitude;
(3) backfill
On said concrete layer, lay the aggregate chips layer, every layer of backfill thickness≤500mm, degree of compaction reaches more than 90%, and the total thickness of aggregate chips layer is 3000～4500mm;
On said aggregate chips layer, lay macadam, the maximum particle diameter of rubble is not more than 100mm, every layer of backfill thickness≤500mm, and degree of compaction reaches more than 85%, and the thickness of said macadam is 4000～6000mm.
In the present embodiment; Said backfill structure comprises sand bedding course 1, concrete layer 2, aggregate chips layer 3 and macadam 4; Said concrete layer 2 covers the end face of said sand bedding course 1; Circulating water pipeline is arranged in said concrete layer 2, and said concrete layer 2 is provided with the expansion joint for 20～30 meters along circulating water pipeline direction interval; The end face of said concrete layer 2 covers aggregate chips layer 3, and the end face of said aggregate chips layer 3 covers macadam 4.
The thickness of said sand bedding course is 1000～1500mm, and the thickness of said concrete layer is 4000～5500mm, and the thickness of said aggregate chips layer is 3000～4500mm, and the thickness of said macadam is 4000～6000mm.
The work progress of present embodiment is following:
(1) sand bedding course construction
Sand bedding course thickness 1000～1500mm, material be medium coarse sand and coarse sand (particle diameter＜2mm), according to near local Investigation of Raw three nuclear power plants, circulating pipe sand consumption is big, particle diameter＜2mm medium coarse sand and the coarse sand nearby source of goods are not enough.Should shift to an earlier date charging according to local material supply situation and construction aggregate scheduling conditions of demand, specified position is stacked near the foundation ditch of ground.
Construction technology process: measure substrate absolute altitude → foundation trench and check and accept and receive → emit sideline → blanking → pave and share → sprinkle water afterwards with plate pulsator ram-jolt → sand degree of compaction sampling test.
Substrate can not ponding, can not stop up the gutter during sand bedding course construction, forbids the construction of heavy rain weather, and surfacing is accomplished in the sand bedding course construction, and whole closely knit, thickness satisfies.
Suitably add water and use the wooden stick tamping during welding job hole backfill sand.
(2) concrete is assured
Because threeway and elbow concrete backfill highly reach 7m, consider formwork bracing system safety, concrete is built at twice here, builds to big buttress top for the first time, water to designed elevation for the second time, so template is installed at twice.Other backfill section concretes once water to designed elevation.
Per 20～the 30m of designing requirement plain concrete backfill section is provided with the expansion joint one, and the wide 20mm in expansion joint separates with the pitch board slot; According to drawing requirement with make things convenient for site operation, at several places down the expansion joint is set:
A, stay at three-way elbow concrete backfill section and arm concrete backfill boundary and to establish an expansion joint;
B, extend 2.0m at-6.9m and-3.0m area limit place northwards and stay and establish an expansion joint;
C, stay on border, 2# buttress southern side in three-way elbow concrete backfill section and to establish an expansion joint;
D, every 30m stays and establishes an expansion joint in-3.0m concrete backfill zone.
Engineering is installed and removed to template and supporting system: construction technology process: appearance check and correction → template construct → formwork reinforcing → cleaning foreign material → examination → form removal is checked → turned over to axis, absolute altitude.
According to the stay in place form physical dimension; Template adopts 12 thick wood veneers to add the assembly of 50 * 100mm Wooden Batten and processes typified form; On-the-spot install the back with Φ 48 * 3.5mm steel pipe carry out level, the two-way reinforcing of Vertical direction, utilize ∮ 16 tiltedly draw the bolt fastening, carry out the template trim designs in advance, be main with the combined type template; The preparation template in the internal field is moved on-the-spot the installation again to.The fritter assembly unit must not be arranged, and is main with bulk.
All templates and support system thereof have enough intensity, rigidity and stability, guarantee the correctness of construction element position, shape and size.
According to axis and absolute altitude, tell each member actual size, position and absolute altitude with steel ruler etc. before the formwork, the good line of ink marker of bullet is as the formwork reference line.The template edge joint position is pasted 20 * 3mm foam single face adhesive tape.
Tiltedly draw screw rod to be provided with by ∮ 12 spacings 600 * 600mm, every screw rod adopts double nut, and nut is reserved outward and is not less than the long screw head of 30mm.Screw arbor with nut at both-ends should be according to template contours size degree of tightness degree of having.
Construction inspection rules and designing requirement are pressed in strictness during form removal, confirm the form removal scheme, prevent accident.Tear open earlier according to what propped up the back, tear open after propping up earlier, tear the order of non-bearing part earlier open and carry out, it is too urgent not overexert during form removal, in order to avoid damaged structure concrete quality.
Template must be strengthened protection in demolishing process, remove back block-by-block transmission, must not throwing, and the template that removes is cleaned out, and in time transports, and repairs impaired parts, and the good oil of isolating of plate face brush is neat by the specification classify and pile up, in order to using again.
Concrete design: concrete construction mixing ratio, entrust the nuclear power laboratory to carry out, it is single to provide mixing ratio by test room, and this engineering concrete mixing ratio has C20, C30, C35.
The concrete blanking: concrete is a deep foundation ditch concrete, selects for use automotive pump and mounted pump to cooperate and carries out the concrete blanking.
Placement layer by layer during casting and compacting of concrete, every layer thickness is controlled in the 300mm, so that hydration heat in time discharges.Arrange the abundant manpower and the machinery that vibrates, worker 8 people of vibrating of every work team, 8 of vibrating heads.Vibrating head is inserted soon and is pulled out slowly.It is evenly distributed to insert the some layout, and pointwise is moved, and order is carried out, and should not omit, and moving interval is not more than 300-400mm.In the process of vibrating, vibrating head must not directly vibrate reinforcing bar and template.Should vibrating spear be stretched into lower-layer concrete during the upper strata concrete vibrating and be not less than 100mm, concrete vibrating should be looked the concrete bubble that do not go out to emerge, and slurry no longer sinks for degree, must not owe to shake and cross and shake.
During concreting, answer running check to observe template, preformed hole, pinpoint the problems and in time correct.
The purpose of concrete conservation system concrete curing is in order to make concrete that suitable curing condition arranged; Guarantee that concrete reaches the intensity of designing requirement in prescribed period of time; And prevent that concrete from producing shrinkage crack; Covering and water seasoning, geotextiles covering curing pattern are adopted in concrete maintenance process, this engineering.
(3) backfill
According to local material supply situation investigation and engineering construction experience always of the same type: the above 4500mm of sand bedding course (absolute altitude is-2.00m～2.50m) the interior backfill amount of scope is bigger; Restricted by the local material supply; Adopt the medium coarse sand backfill to be difficult to satisfy engineering construction progress demand; Relatively more sufficient according to market material supply investigation aggregate chips (stone flour) source of goods, and also have part aggregate chips (stone flour) available in the factory.The contrast of aggregate chips (stone flour) and sand facies, close to protective action and the specific resistance that pipeline rose, so the above 4500mm of sand bedding course (absolute altitude is-scope of 2.00m～2.50m) in, the backfill of employing aggregate chips (stone flour) can be satisfied and designs and schedule requirement, every layer of backfill thickness≤500mm,
Degree of compaction reaches more than 90%; The circulating pipe pipe push up above 3500mm (absolute altitude is to adopt aggregate chips (stone flour) backfill in the scope of 2.50m～6.00m), every layer of backfill thickness≤500mm, degree of compaction reaches more than 90%; Plant area ground down 6000mm (absolute altitude is to adopt the graded broken stone backfill in the scope of 6.00m～12.00m), and maximum particle diameter should not be greater than 100mm, every layer of backfill thickness≤500mm, degree of compaction reaches more than 85%; The circulating pipe pipe pushes up above 3500mm, and (absolute altitude is metal conduit buffer protection district in the scope of 2.50m～6.00m); Formerly be designed to the spoils that medium coarse sand or aggregate grading or other meet the backfill quality requirement, use with the alternative sand of aggregate chips (stone flour), graded broken stone with the above.Backfill maximum particle diameter≤100mm is down adopted in the 6000mm scope in plant area ground; Particle diameter≤5mm particle diameter content surpasses 25% of full weight; Because of having pressed designing requirement production in rock crushing plant in the factory, as long as supply can satisfy schedule requirement, so adopt the graded broken stone backfill by former design.
The blanking measure: 1, (absolute altitude is aggregate chips (stone flour) blanking in the scope of-2.00m～2.50m) to the above 4500mm of sand bedding course: reach 30 meters because foundation depth reaches 15 meters, width suitable for reading deeply; Give backfill blanking difficulty bigger; Especially the backfill between two pipelines; Will be under the prerequisite of not damaging pipeline corrosion protection with backfill from ground blanking to foundation ditch overhead by 14 meters height, and the foundation ditch horizontal equivalent from the foundation ditch center line suitable for reading is long.Utilize common directly blanking of 200 excavators; There are two kinds of schemes feasible in conjunction with past construction experiences: one, to utilize the direct blanking of extension arm excavator; 15 meters of extension arm digging machine armed lever length overalls, in the blanking of foundation ditch both sides, can be with aggregate chips (stone flour) directly down to the pipeline top; For reducing the free drop of aggregate chips (stone flour), reduce excavator hopper height as far as possible.Earlier by dividing to the four sides by manual work again in excavator blanking to the foundation ditch.Whenever establish a blanking point at a distance from 5～10 meters.Two, the place, thoracic cavity sets up a chute between excavation slope neutral position and pipeline, utilizes machinery blanking in chute again.More than two kinds of schemes do selection again according to field condition.2, pipeline pushes up above 3500mm (absolute altitude is aggregate chips (stone flour) blanking in the scope of 2.50m～6.00m), adopts dump truck directly to open the down batch turning to the foundation ditch limit, and ting model bulldozer or ting model excavator are spread out and put on.3, below ground 6m (absolute altitude is 6.00m～12.00m) in the scope transportation chute is set, dumping car directly by opening in the foundation ditch, is paved with excavator or bulldozer, because of percent consolidation greater than 85%, exerting pressure with the excavator crawler belt gets final product.
The sampling of backfill compacting degree: the test of backfill compacting degree is established 1 point by per 50 meters, and per 1 presses the sampling of 50cm one deck once; For not influencing construction speed, every lamination solidity is tested on the step that is unified in reservation and is taken a sample.
Must be noted that following item during backfill:
After A, circulating water pipeline install and check and accept, should in time carry out backfill, not allow the pipeline of installation is exposed for a long time.Before backfill, the emptying of substrate ponding, mud, foreign material are removed, and must not under the situation of ponding, carry out backfill.To underground pipework both sides or before reaching the top backfill all around, should carry out each item inspection to underground engineering earlier, perform hidden record and handle the examination formality.
Artificial backfill is used at B, position, pipeline thoracic cavity, and rammer compacter compacting should the evenly backfill simultaneously in the pipeline both sides during backfill, and carries out layering from bottom to top with the compacting of oscillatory type rammer compacter, makes it enough intensity and stability, every layer of empty shop, and thickness should not be greater than 500mm.
C, the pipe following backfill in top; Forbid one-sided backfill or push away in the side direction hole to be filled out, be out of shape in order to avoid cause conduit axis displacement and interface with bulldozer; Hand compaction will be used in the tube wall edge during compacting, avoids destroying the anticorrosive coat of pipeline.Should in time repair if any destroying.
D, the above zone of pipeline end face 3500mm are with small-sized machine backfill, vibrating rammer compacting, and lift height is controlled in the 500mm.
Available conventional construction plant backfill compacting in G, the following 6 meters scopes in the face of land.
E, can reach designing requirement for guaranteeing the backfill degree of compaction; Except that adopting compaction in layers; Material selection must accomplish that grating is reasonable, and the control water content. different because of material and construction plant that each construction part adopts, reply is on-the-spot through carrying out extensive backfill again after the test of degree of compaction test section.
Can backfill reach the degree of compaction requirement of design, closely related with the moisture content of backfill, should carry out following measure for the water content that guarantees earth material can meet the demands:
A, forbid the rainy day backfill, guarantee not ponding of foundation ditch.
B, should control amount of water to big materials of water absorption rate such as aggregate chips (stone flour), sand.
Welding job hole construction: according to the piping erection situation, cheat after sand bedding course is constructed and accomplished, and establish the sand block wall that height is 800mm by sand bag heap in the good working pit both sides setting of excavation with the mini-excavator excacation; Backfill receives the restriction of place and execution conditions can only adopt artificial backfill around the working pit; Simple artificial backfill progress is slow, to not assurance of duration, selects the press water ramming technology in the construction for use; And combine minicomputer instrument compacting way, can adopt machinery to ram after pipe top 1m is above and fill out.
Claims (4)
1. one kind large-scale ultra dark circulating water pipeline backfilling process, it is characterized in that: said backfilling process may further comprise the steps:
(1) sand bedding course construction:
Sand bedding course thickness 1000～1500mm, material are medium coarse sand and coarse sand, and work progress is: measure substrate absolute altitude → foundation trench and check and accept and receive → emit sideline → blanking → pave and share → sprinkle water afterwards with plate pulsator ram-jolt → sand degree of compaction sampling test;
(2) concrete is assured
The thickness of said concrete layer is 4000～5500mm, and circulating water pipeline is placed on the sand bedding course, and work progress is: appearance check and correction → concrete shuttering panel making → formwork reinforcing → concrete blanking → examination → form removal is checked → turned over to axis, absolute altitude;
(3) backfill
On said concrete layer, lay the aggregate chips layer, every layer of backfill thickness≤500mm, degree of compaction reaches more than 90%, and the total thickness of aggregate chips layer is 3000～4500mm;
On said aggregate chips layer, lay macadam, the maximum particle diameter of rubble is not more than 100mm, every layer of backfill thickness≤500mm, and degree of compaction reaches more than 85%, and the thickness of said macadam is 4000～6000mm.
2. a kind of large-scale ultra dark circulating water pipeline backfilling process as claimed in claim 1, it is characterized in that: in said step (2), concrete layer is provided with the expansion joint one along the per 20～30m of circulating water pipeline direction, and the wide 20mm in expansion joint separates with the pitch board slot.
3. a kind of large-scale ultra dark circulating water pipeline backfilling process as claimed in claim 2; It is characterized in that: in said step (3); The process of aggregate chips layer or macadam blanking: utilize the direct blanking of extension arm excavator, 15 meters of extension arm digging machine armed lever length overalls are in the blanking of foundation ditch both sides; With aggregate chips or rubble directly down to the pipeline top, earlier by dividing to the four sides by manual work again in excavator blanking to the foundation ditch.
4. a kind of large-scale ultra dark circulating water pipeline backfilling process as claimed in claim 2; It is characterized in that: in said step (3); The process of aggregate chips layer or macadam blanking: the place, thoracic cavity sets up a chute between excavation slope neutral position and pipeline, utilizes machinery blanking in chute again.
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| CN102943945A (en) * | 2012-12-07 | 2013-02-27 | 中国石油集团工程设计有限责任公司 | Earthquake-proof protection method for pipeline projects passing through fault zones |
| CN103615043B (en) * | 2013-11-06 | 2016-05-25 | 中铁二十一局集团第二工程有限公司 | Direct-burried drainpipe and the construction method thereof on carrying main equipment or dynamic load ground |
| CN109812621B (en) * | 2019-02-01 | 2024-01-30 | 北京城建集团有限责任公司 | Concrete encapsulated pipeline structure and construction method thereof |
| CN109888712A (en) * | 2019-03-14 | 2019-06-14 | 济南轨道交通集团有限公司 | The backfill protection structure and method of deep basal pit top high-voltage power pipeline |
| CN112555503A (en) * | 2020-12-01 | 2021-03-26 | 上海宝冶集团有限公司 | Biological enzyme curing method for backfilling pipeline groove |
| CN113718800A (en) * | 2021-08-20 | 2021-11-30 | 广东省水利水电第三工程局有限公司 | Method for backfilling and compacting pressure pipeline within limited time |
| CN114960690B (en) * | 2022-06-02 | 2023-06-09 | 中国建筑第八工程局有限公司 | Ditch backfilling and guiding tool for automatically separating natural graded sand and construction method thereof |
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| JP2592429B2 (en) * | 1990-08-08 | 1997-03-19 | 建設基礎エンジニアリング 株式会社 | Sewer and its construction method |
| KR100926173B1 (en) * | 2009-03-31 | 2009-11-10 | 정병양 | Piping structure and method for constructing the same |
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| CN101565964A (en) * | 2009-05-25 | 2009-10-28 | 青岛恒生源集团建设有限公司 | Construction method for mounting outdoor embedded high-density polyethylene double-wall corrugated drain pipe |
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