CN101315139B - Immersed pipe construction technique of river crossing pipe - Google Patents

Immersed pipe construction technique of river crossing pipe Download PDF

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Publication number
CN101315139B
CN101315139B CN2008100289209A CN200810028920A CN101315139B CN 101315139 B CN101315139 B CN 101315139B CN 2008100289209 A CN2008100289209 A CN 2008100289209A CN 200810028920 A CN200810028920 A CN 200810028920A CN 101315139 B CN101315139 B CN 101315139B
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pipe
construction
pipeline
water
cofferdam
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CN101315139A (en
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何伟清
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Guangzhou Water Supply Engineering Co., Ltd.
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GUANGZHOU WATER SUPPLY ENGINEERING Co
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Abstract

The invention relates to a construction process of a river crossing immersed pipe, which comprises the following steps of: (1) forming an onshore pipeline; (2) excavating an underwater foundation trench and earthmoving; (3) breaking a levee; (4) filling with coarse sands; (5) treating a pipe foundation with pillow blocks; (6) assembling a suspended working platform; (7) placing the pipe into water in a suspension way; (8) hauling the pipe; (9) laying down the pipe; (10) immersing the pipe; (11) backfilling the foundation trench; and (12) connecting the onshore pipeline, and constructing a cofferdam. The inventive construction process can lay a pipeline crossing a river at the rive bottom in the case of no conditions overhead the pipeline across a watercourse. The inventive construction process has the advantages of simple process, high operational efficiency, and effectively reduced construction cost. By using the inventive construction process, the river channel may not be influenced by the pipeline erection, and the construction cost is saved.

Description

A kind of immersed pipe construction technique of river crossing pipe
Technical field
The present invention is a kind of immersed pipe construction technique of river crossing pipe, belongs to the renovation technique of river crossing construction process.
Background technique
In the process of construction of water supply network and sewage network, the inevasible meeting of pipeline runs into the situation across the rivers water channel, when running into this situation and not having condition, just need adopt the method for construction of immersed tube that the bottom is gushed in pipe laying in the river pipeline is built on stilts when crossing water channel.
Summary of the invention
The objective of the invention is to consider the problems referred to above and provide a kind of solution not have condition pipeline is built on stilts when crossing water channel, can gush pipe laying in the river immersed pipe construction technique of river crossing pipe of bottom across the pipeline of rivers.The present invention makes the rivers navigation channel not be subjected to the influence of support of pipelines, saves engineering cost.
Technological scheme of the present invention is: immersed pipe construction technique of river crossing pipe of the present invention, and it includes following steps:
1) shore pipeline moulding;
2) excavating foundation trench and muck haulage under water;
3) broken dike;
4) coarse sand is filled out in throwing;
5) the basic bolster of pipe is handled;
6) hang the ship assembling;
7) water under the swing pipe;
8) hauling pipe;
9) transverse tube;
10) immersed tube;
11) foundation trench backfill;
12) be connected cofferdam construction with shore pipeline;
Above-mentioned steps 10) immersed tube in comprises the steps:
101) water inlet
After transverse tube is finished, open the outlet valve of two pipe ends, open water intake, adopt the entry of nature douche; Under unified command,, respectively hang ship and tighten up simultaneously or loosen anchor hawser and the same moved further of steel pipe, above steel pipe is in foundation trench fully, pipeline is the attitude of half-formed foundation trench in place the steel pipe moulding of slinging;
102) sink
Exhaust situation according to pipe ends is loosened wire rope by respectively hanging ship several times, and steel pipe is sunk gradually, and 0.2m sinks at every turn; Along with water constantly pours into, pipeline sinks gradually, and each suspension centre is constantly adjusted simultaneously, to guarantee the reasonable distribution of each suspension centre; In an orderly manner during the sinking process, manage the measurement monitoring work that center line and foundation trench axis are proofreaied and correct at pipeline; Respectively hang ship and move to reach and progressively aim at foundation trench axis and terminal position, two sides, until adhering to specification substantially;
When foundation trench has 0.3m, stop to sink when the pipe end, utilize the survey crew of two sides that the steel pipe axis is readjusted, after accurate,, respectively hang ship hoist cable is relaxed to the pretension state, stay original position and await orders under the unified command steel pipe being sink on the pipe basis;
The two sides, river course are provided with line traffic control stake and temporary bench mark in the pipeline, and every side should not be less than 2, the position that should be located at firm location and be convenient to observe, and take protective measure; Measurement and positioning was accurate when river crossing sank, and often school survey in sinking; It is stressed even that the two ends crane gear should keep when lifting, and the sinking pipeline is in place in bottom land synchronously;
104) pressure testing
Check whether the steel pipe position adheres to specification, carry out the operation of the tight intake pipe flange plate of bolt screw by water under the diver after confirming, carrying out the hydraulic pressure pressure testing then checks and accepts, the hydrostatic test specifically requires to carry out with reference to pipeline pressure test, when if pressure drop is excessive, again carry out fasteningly to the water inlet shrouding by the diver, the two sides personnel handle the leakage of pressure testing pipe fitting simultaneously, check and accept until pressure testing to reach qualified requirement;
104) location
Respectively hang the ship decomplexing after the pressure testing, stay original position, allow under the diver water place chockstone in the bolster both sides to stablize pipeline.
Being connected cofferdam construction with shore pipeline and comprising the steps: above-mentioned steps 12)
121) measure unwrapping wire
Measure the workmen and emit the pipeline boundary of works area in construction according to perforated pipe or river crossing design attitude, and the scope in cofferdam;
122) cofferdam construction
The cofferdam is filled to adopt and is accounted for into method effluent limit and carry out to the korneforos; People's frock soil is gone into bag, and soil loading amount is about 2/3 of bag capacity, and sack is sewed up with linen thread or thin wire; Earth bag is transported to working surface by dump truck and unloads at the construction field (site), then by manually piling up the sand bag; During the pile earth bag, accomplish up and down that mutually the fissure of displacement, pile are neatly closely knit;
Sand surrounds the weir puts the slope at upstream face, and the gradient is 1: 1; The back side gradient is 1: 1.5, leaks in order to prevent the sand bag, at upstream face fibre cloth is set and carries out the sealing processing; The fibre cloth base pressure is under the sand bag, and the fibre cloth top adopts the sand bag pressure to live, the top absolute altitude than the cofferdam after highest water level exceed 50cm;
123) construction measures of preventing water
Still have the ground of seepage can cotton-wool, cloth etc. is stifled tight with it, the location that the part sealing does not live can adopt fibre cloth sealing and sand to surround the weir sealing; Need for handling special circumstances, prepare enough sandbags one and be equipped with the possible period of want or need;
Both sides all are provided with the gutter at the bottom of the foundation ditch, and every construction section is established four sumps, and draining the water away at any time with many Φ 100mm submersible pumps gets final product, and avoid river crossing foundation ditch hole subsoil earth to be soaked;
124) construction water guide measure
Adopt totally-enclosed cofferdam to construct,, intend adopting installation D1200 steel pipe to carry out water guide and handle for guaranteeing former flow; Steel pipe carries out the installation of aqueduct when cofferdam construction is at the bottom of the aqueduct designed elevation, aqueduct length is longer during the cofferdam construction of perforation hole, can add temporary rest pier and reinforce at the bottom of aqueduct; Proceed piling up of cofferdam sand bag after the aqueduct installation, until adopting the sand bag that aqueduct is pushed down;
125) draw water and substrate cleaning
The cofferdam pile up finish close up after, suction engine is installed is drawn water, the ponding in the cofferdam is drained; Draw water and the substrate in the cofferdam is cleared up after finishing, the foreign material that remove rubbish are conveniently to construct.
The present invention is owing to adopt the construction process that includes following steps: 1) shore pipeline moulding; 2) excavating foundation trench and muck haulage under water; 3) broken dike; 4) coarse sand is filled out in throwing; 5) the basic bolster of pipe is handled; 6) hang the ship assembling; 7) water under the swing pipe; 8) hauling pipe; 9) transverse tube; 10) immersed tube; 11) foundation trench backfill; 12) be connected cofferdam construction with shore pipeline.Therefore, the present invention solves pipeline across rivers does not have condition pipeline is built on stilts when crossing water channel, can gush the bottom to pipe laying in the river.Construction process of the present invention is simple, and high working efficiency can effectively reduce operating expenses.The present invention makes the rivers navigation channel not be subjected to the influence of support of pipelines, saves engineering cost, is a kind of convenient and practical immersed pipe construction technique of river crossing pipe.
Description of drawings
Fig. 1 is connected worker's process flow diagram of cofferdam construction with shore pipeline for the present invention;
Fig. 2 is a cofferdam of the present invention planimetric map.
Fig. 3 is a cofferdam of the present invention sectional drawing.
Embodiment
Construction process of the present invention includes following steps:
One, preliminary preparation
1. investigation ambient environmental conditions, behind definite moulding pipe place, auxilliary facility worker sidewalk.
2. must handle formalities such as construction declaration, construction announcement and notice to navigator before the construction.
With construction unit and architect carry out coordinate points, leveling point handing-over, check, fill in " record is checked in measurement " and the signature put on record.
4. carry out unwrapping wire and water gauge is installed according to the position of coordinate points, leveling point, and the baseline and the network point of river crossing are set.
5. tissue part's facility, personnel march into the arena, and temporary facility is set up in smooth place.
Two, shore pipeline moulding
1. preparation of construction
In river crossing moulding place with the pipeline welding moulding.Before the pipeline moulding, according to the elevation dimension repetition measurement river bed absolute altitude in design riverbed and the developed width of river surface, check with design drawing is errorless and can carry out the pipeline moulding earlier.
The smooth required moulding place of elder generation before the construction, the length in place is wanted to hold four parallel river crossings of D530 and machinery operating space with width, organizes facility, personnel, materials arrival then.
2. pipeline moulding
Carry out the developed width of repetition measurement river bed absolute altitude and river surface before installing earlier according to the elevation dimension in design riverbed, check with design drawing errorless after.On the moulding place (near the river course) of lease, carried out the welding fabrication of river pipe.Through the place is investigated, plan the moulding place and fix on and be positioned at river crossing engineering section embankment next door, this place has more smooth and near along the river, is very good moulding place.
During piping erection, according to the moulding pipe shape every about 5m place mat sleeper (middle part of every steel pipe is taken three layers anyhow with sleeper, become " well " font) aerial pipeline.The pipeline lifting rope should be pliable and tough, and the braid of broad, suspender belt or rope are fixed with timber wedge in the pipeline both sides behind the installation qualification, prevent pipe shifted.The quality of shore pipeline moulding is the first step that guarantees the river crossing construction quality, also is the key link, must work out and take some measures and welding quality is guaranteed in requirement.The river crossing welding fabrication can be carried out with reference to steel pipe welding requirements in pond, the farmland the requirement of people, material, machine and welding process, and weldquality must reach " code for construction and acceptance of water supply and sewerage pipeline engineering " (50268-97) requirement.
Carry out quality inspection as requested after the weld seam welding finishes, must do the kerosene permeability test.The weld seam that needs are further identified carries out X-ray film making or ultrasonic flaw detection, checks the weld seam inner case.Defective weld seam should be rooted out and reweld, and after weld inspection is qualified, adopts epoxide coal bituminous technology to carry out preservative treatment.
3. the pipeline corrosion protection of crossing the river
Derusting grade is ST3, and inner tube wall primary coat KY-2021 thick paste type epoxy anticorrosive paint, rust, thick 240um, face are coated with the heavily anti-coating of KY-2026 high waterproof epoxy, brownish black, thick about 240um, the about 480um of coating dry film thickness; The thick about 240um of pipe outer wall primary coat KY-2021 thick paste type epoxy anticorrosive paint, face are coated with the heavily anti-coating of KY-2026 high waterproof epoxy, brownish black, thick about 360um, the about 600um of coating dry film thickness.Corrosion-resistant detects should carry out spark test by standard, and test voltage must not be lower than 5Kv.Steel pipe adopts the soft cloth lifting when managing down, in order to avoid damage anticorrosive coat.
4. test on the bank
Recheck each spot size after every section river crossing moulding, add shrouding at every river crossing two ends then, install in the top of disembarkation two end-plates and connect the usefulness that short tube is done immersed tube water inlet and exhaust in two DN200mm steels.
Must carry out the hydrostatic test on the bank after the river crossing moulding, test pressure after hydraulic pressure rises to test pressure lentamente, kept constant voltage 10 minutes by designing requirement, checked that interface, pipe shaft do not have breakage and water leakage phenomenon, thought the pipeline strength pass the test.10 minutes pressure descends and is not more than 0.05MPa, and the pressure testing quality is qualified, and 10 minutes pressure descends and is not more than 0.02MPa, and the pressure testing quality is good, water in the vomit pipe of hydrostatic test success back.
Three, excavating foundation trench and muck haulage under water
1. preparation of construction
Before pipe excavation, handled over-water construction license and notice to navigator, troop of organizing construction determines the construction boats and ships, carries out material supply and depository projects such as fuel oil, machine maintenance, material.
Horizontal control point according to construction unit provides adopts plane control and Height control, adopts GPS location excavation construction, and is accurate to guarantee the groove central position.During conditions permit, can set up beacon between two shore beacons is that pipe centerline and side slope line are set up the water gauge observed stage at two of bank, so that workboat control cutting depth can be surveyed the position and the bottom land elevation of groove under water with scale or plumb bob.
2. method of construction
Underwater excavation adopts 4-6m3 clamshell ship, excavates the pipeline that the crosses the river fluting gradient 1: 3 respectively to main channel from two sides far from the bank.Note digging to a segment length, the top inspection of fetching water, groove is adhered to specification till.
Pearl base height point according to plane coordinate point and construction use positions fixed point work.Two banks of gushing in the river are provided with water gauge and carry out degree of depth control.
1) locatees (checking) foundation trench center line and sideline, both sides point at the construction field (site).To excavate sign and erect, clearly excavate direction and length.After will excavating coordinate and data input computer, employing location day-mark or gps satellite location excavation (precision is at 0.5-1.0 rice) side slope were by 1: 3 calculating excavation face width degree.
2) set up two water gauges on the bank both sides of foundation trench, boats and ships are watched during convenient construction, in time control cutting depth.
Reduce silt amount when 3) considering construction, adopt layering to divide two sections excavations, reduce back-silting of mud, every layer of cutting depth is at 2-3 rice.
4) construction period adopts and to Da Shui and proofread and correct cutting depth and check the excavation quality, accomplish to complete preceding, complete in, three the sounding self checks of being completed (adopting sounding machine to measure).
5) excavation silt is transported to interim stacking the in bank and is treated that immersed tube finishes silt is covered pipeline (remaining silt is transported).
6) after excavating foundation trench completion, carry out finish construction survey and check and accept, must accomplish that cutting depth meets design, lay behind the sleeper beam repetition measurement depth of water more then.
3. excavation quality standard
The excavation of foundation trench uses standard to construct with Ministry of Communications's " port works technical specification " and " port works quality evaluation standard ", and each section Height control should adhere to specification.The excavating foundation trench degree of depth sees relevant design figure for details with pipe end absolute altitude.
Use the sounding machine work that carries out an acceptance inspection after the tube seat excavation works is finished, carry out thinly clearly again to what do not meet designing requirement, until meeting design and construction requirement, foundation trench just can carry out immersed tube after Waterway Bureau's retest-ok, guarantee construction quality and duration progress.
Four, broken dike
In the steel pipe work progress that crosses the river of this engineering, the old embankment that needs earlier the river to be gushed two sides is removed, and after work such as treat that two the steel pipe sinking successes of crossing the river, valve wells are built by laying bricks or stones are all finished, the embankment that destroys is restored to the original state again.Construction operation is coordinated in the requirement of broken dike, the multiple strict tender document of dike.
Excavators of embankment dismounting plan employing etc. are about machinery and manually cooperate the old embankment of dismounting, and the width of embankment dismounting is as the criterion with construction requirement.When removing old embankment, should be noted that the existing waterway is protected, prevent that the cubic metre of earth and stone of removing is scattering in the river gushes, and causes channel filling.
Five, coarse sand is filled out in throwing
Throwing is filled out coarse sand and is used the belt self-discharging ship that the basis is fixed a point to throw, and after basis for establishing position ramming is finished, by the diver basis is carried out carefully putting down, and makes the thin flat absolute altitude requirement that meets.
Six, the basic bolster of pipe is handled
After the pipeline foundation trench is checked and accepted and to be passed through, in part, bolster position by the plan requirement dig again deep-cut wide.Bolster is placed by designed depth in the check back.
Fill out in the process in throwing: 1. Ying Qin is to mark, and duty is moved ship; 2. the diligent depth of water and the calculating side's amount surveyed; 3. diligent observed stage and current situation of change are particularly in the situation of fluctuation tide; 4. diligent record.
Bolster is undertaken prefabricated by designing requirement, curing time is transported to the job site later.Dispose one small-sized hang ship by survey crew on the bank with the accurate measurement and positioning of infrared rays, be placed on corresponding position, install under water by the diver, until installing.At any time the bolster elevation is measured in the put procedure, be adjusted to design altitude.
Bolster position and elevation be through after the assay was approved, backfill rubble between bolster.Bed course setting and jackstone pressure pipe arrangement and method for construction employing bottom opened and belt type stone dumper location, quantitative jackstone method.
Seven, hang the ship assembling
After the acceptance(check) of moulding pipeline pressure test, adopt crane and many crust lever systems to hang the method that ship lifts simultaneously, the moulding pipeline section is placed from winching to the water surface on the bank.
Determine pipeline lifting concrete time of water down according to Construction Plan, handle port, relevant construction operation waters to port prison application in advance and supervise supervisory service waterborne, half iceound hand preface, require to specify pipeline temporarily to leave with the waters.
Every meter weight of welded steel pipe is very big, use during water under the swing pipe and hang ship, and pipe ends respectively is provided with loop wheel machine on the coast, is distributed in proportion between each suspension centre, the anchor-hold that hangs power and retreat with increase.
Before ship was hung in assembling, the boats and ships selected for use of reply were tested, and stability, intensity and the yardstick of boats and ships calculated, and after meeting the requirements fully, could select use.
The boats and ships that suitable engineering construction needs are dispatched near the harbour the job site, hang the ship assembling.Assembling is hung ship and is divided into lifting (herringbone raking arm etc.) system, and power (generator set, winch etc.) system, chain of command and configure equipment etc. need each with regard to its position according to construction, finish assembling after the assay was approved.
Be to guarantee construction quality and safety, all hang ship and carry out the lift heavy examination and hang and related detection work that carry out in strict accordance with " lifting boats and ships working specification " (Ministry of Communications 1998), the special messenger is responsible for detecting and record, can put in the construction after qualified and use.
Eight, water under the swing pipe
1. preparation of construction
Pipeline lifting before the water, answers whether ponding clears in the access tube down, export the accommodation depth of water that whether seals, hang ship (according to site specific, needing in advance the accommodation to dredge) whether meet the demands etc. qualified after.Carry out earlier the suspension centre numbering on pipeline, hang the numbering of ship according to oneself, the numbering of aiming at steel pipe respectively is in place, and throws good back anchor.Fasten preceding cable on the coast, with the astern speed of control ship handkerchief.
2. work progress
During lifting the landing stage correspondence separately suspension centre be located in bank, tubulation place, locate and establish that cable hangs suspension centre separately before the some, hang network and pipeline enclosure and wooden clamping plate should be set to protect pipeline anticorrosion coating.
Steel pipe is directly sling by hanging ship, puts into water, tugs the scene then.
Nine, hauling pipe
Work to arrange ship according to hauling pipe arrangement figure (seeing pipeline section towage schematic representation waterborne) before dragging, main tugboat and tube head connect with nylon rope.In the haul process should note following some:
1) the emergent taboo anchor buoy will that should be careful two sides when casting anchor avoids damaging underwater facility.
2) do not allow hanger to contact in the towage process, break outside the steel pipe anticorrosion with pipe shaft.
3) towage overall process keep supervising by walkie-talkie and other contact by the commanding with the port and each ship Line Leader between getting in touch so that fleet in time, fill order correctly.
4) determine the hauling pipe date, should shift to an earlier date 5 days and handle notice to navigator, and application port prison sends ship to be assisted.
Ten, transverse tube
1. preparation of construction
The date of immersed tube should be less according to the selected tidal range of local tidal tables, the advection time in the morning the date during 9-11 be good, determine that immersed tube day after date need shift to an earlier date 5 days and handles iceound formality, notifies.
2. work progress
1) major part is hung ship cloth anchor and in place in position separately during transverse tube.Mild and begin preceding 1 hour beginning transverse tube of turn of tidal stream at tidewater.With hanging ship north pipe end is fixed, pipe end and embankment are maintained a certain distance, avoid the pipe fitting of pipe end when transverse tube, to break.
2) use tugboat and anchor ship during transverse tube, steel pipe this shore is hauled out to other shore.When steel pipe was dragged to river surface 2/3, the speed of the hauling pipe that should slow down utilized the current that still have slowly pipe to be flow to other shore, and the tugboat of this moment should be controlled the speed of steel pipe transverse tube.
3) since the horizontal length of steel pipe greater than the distance of two sides, natural transverse tube can not make steel pipe lie across on the foundation trench.When two pipe ends will contact with two sides, stop transverse tube, respectively hang ship and hasten forward, and on suspension centre separately, hold network to the steel pipe limit, finish and await orders after holding network.
4) when all hang ship finish hold network can the unified command under prestressed.The overall command is according to respectively hanging the residing position of ship, the sling height that commander respectively hangs ship, the hanging ship and will keep prestressed of middle straight pipeline section this moment.When slinging at the bottom of the two pipe end pipes to the two sides height, can continue transverse tube, be in the pipe in the foundation trench until the steel pipe two ends.
11, immersed tube
1. water inlet
After transverse tube is finished, open the outlet valve of two pipe ends, open water intake, adopt the entry of nature douche.Under unified command,, respectively hang ship and tighten up simultaneously or loosen anchor hawser and the same moved further of steel pipe, above steel pipe is in foundation trench fully, pipeline is the attitude of half-formed foundation trench in place the steel pipe moulding of slinging.
2. sink
The overall command commands several times according to the exhaust situation of pipe ends and respectively hangs ship and loosen wire rope, and steel pipe is sunk gradually, and 0.2m sinks at every turn.Along with water constantly pours into, pipeline sinks gradually, and each suspension centre is constantly adjusted simultaneously, to guarantee the reasonable distribution of each suspension centre.In an orderly manner during the sinking process, manage the measurement monitoring work that center line and foundation trench axis are proofreaied and correct at pipeline.Commander respectively hangs ship and moves to reach and progressively aim at foundation trench axis and terminal position, two sides, until adhering to specification substantially.
When foundation trench has 0.3m, stop to sink when the pipe end, utilize the survey crew of two sides that the steel pipe axis is readjusted, after accurate,, respectively hang ship hoist cable is relaxed to the pretension state, stay original position and await orders under the unified command steel pipe being sink on the pipe basis.
The two sides, river course are provided with line traffic control stake and temporary bench mark in the pipeline, and every side should not be less than 2, the position that should be located at firm location and be convenient to observe, and take protective measure.Measurement and positioning was accurate when river crossing sank, and often school survey in sinking.It is stressed even that the two ends crane gear should keep when lifting, and the sinking pipeline is in place in bottom land synchronously.
3. pressure testing
Check whether the steel pipe position adheres to specification, carry out the operation of the tight intake pipe flange plate of bolt screw by water under the diver after confirming.Carry out the hydraulic pressure pressure testing then and check and accept, the hydrostatic test specifically requires to carry out with reference to pipeline pressure test, if when pressure drop is excessive, again the water inlet shrouding is carried out fasteningly by the diver, and the two sides personnel handle the leakage of pressure testing pipe fitting simultaneously, check and accept until pressure testing to reach qualified requirement.
4. locate
Respectively hang the ship decomplexing after the pressure testing, stay original position, allow under the diver water place chockstone in the bolster both sides to stablize pipeline.
12, foundation trench backfill
The backfilling material of groove is according to the design drawing requirement under water.Adopt belt type to drive ship and throw and fill out, the ship location is filled out by slowly throwing to groove on the ship by control position on the bank, fills out ship to be moved it can be thrown equably in the groove scope in throwing to fill in the groove.Fill out in throwing and will answer in the process that diligent duty is moved ship to mark, diligently survey the depth of water and measure the side of calculatinging, diligent record.
13, be connected cofferdam construction with shore pipeline
1. measurement unwrapping wire
Measure the workmen and emit the pipeline boundary of works area in construction according to perforated pipe or river crossing design attitude, and the scope in cofferdam.
2. cofferdam construction
The cofferdam is filled to adopt and is accounted for into method effluent limit and carry out to the korneforos.People's frock soil is gone into bag, and soil loading amount is about 2/3 of bag capacity, and sack is sewed up with linen thread or thin wire.Earth bag is transported to working surface by dump truck and unloads at the construction field (site), then by manually piling up the sand bag.During the pile earth bag, accomplish up and down that mutually the fissure of displacement, pile are neatly closely knit.
Sand surrounds the weir puts the slope at upstream face, and the gradient is 1: 1; The back side gradient is 1: 1.5, leaks in order to prevent the sand bag, at upstream face fibre cloth is set and carries out the sealing processing.The fibre cloth base pressure is under the sand bag, and the fibre cloth top adopts the sand bag pressure to live, the top absolute altitude than the cofferdam after highest water level exceed 50cm.
3. construction measures of preventing water
Still have the ground of seepage can cotton-wool, cloth etc. is stifled tight with it, the location that the part sealing does not live can adopt fibre cloth sealing and sand to surround the weir sealing.Need for handling special circumstances, prepare enough sandbags one and be equipped with the possible period of want or need.
Both sides all are provided with the gutter at the bottom of the foundation ditch, and every construction section is established four sumps, and draining the water away at any time with many Φ 100mm submersible pumps gets final product, and avoid river crossing foundation ditch hole subsoil earth to be soaked.
4. construction water guide measure
Adopt totally-enclosed cofferdam to construct,, intend adopting installation D1200 steel pipe to carry out water guide and handle for guaranteeing former flow.Steel pipe carries out the installation of aqueduct when cofferdam construction is at the bottom of the aqueduct designed elevation, aqueduct length is longer during the cofferdam construction of perforation hole, can add temporary rest pier and reinforce at the bottom of aqueduct.Proceed piling up of cofferdam sand bag after the aqueduct installation, until adopting the sand bag that aqueduct is pushed down.
5. draw water and the substrate cleaning
The cofferdam pile up finish close up after, suction engine is installed is drawn water, the ponding in the cofferdam is drained.Draw water and the substrate in the cofferdam is cleared up after finishing, the foreign material that remove rubbish are conveniently to construct.
14, the cemented rock river levee is repaired
1. should perform construction drainage before the construction.
2. cut the earth to the substrate absolute altitude, making bed course on ground, compacting is to designing the substrate absolute altitude.No. 25 concretes are adopted on the basis, have to come in and go out with design conditions behind the foundation excavation appropriate to the occasionly to add deep foundation by actual conditions.
3. build by laying bricks or stones
Stone should be put down block, and every layer of building stones height should be roughly same.Outer ring location ranks and veneer stone, Ying Ding arranges along alternate or two suitable fourths, and the puzzle joint width is not more than 3cm; The upper and lower layers perps staggers apart from being not less than 8cm.
During peace building block stone, build keratite earlier for every layer, face stone is filled out abdomen then again.Seat is starched earlier before connecing block, and stone is drenched.The vertical lap seam of veneer stone should be inserted mortar laminated, with grey cutter tamping, and unavailable thin pulp perfusion.Fill out abdomen and also should adopt the shove method, the shop slurry is put into jam-packed with stone more earlier, should clamp-on 1/3~1/2 mortar in the vertical lap seam, and discontented part layering is again inserted mortar.Can clog finger stone to bigger vertical mortar joint as far as possible.But the unavailable finger stone of horizontal mortar joint props up pad or levelling.
The masonry exposed face carries out jointing, and should be when building by laying bricks or stones the outer appearance hollow joint of reserving dark about 2cm is made the usefulness of jointing fully.Masonry concealed surface puzzle joint can be with building with strickling not jointing in addition.
4. after river levee was repaired, cofferdam demolition was taked man-machine coordinative construction, should be begun by the downstream, and at the bottom of the weir, back side is progressively removed to upstream face by weir crest.
15, the mark plate fabrication and installation of " forbidding casting anchor "
Place, two sides, river at river crossing establishes the water pipe marker peg and the sign of forbidding casting anchor, and by navigation channel authorities corresponding relevant sign is set suitably.

Claims (2)

1. immersed pipe construction technique of river crossing pipe is characterized in that including following steps:
1) shore pipeline moulding;
2) excavating foundation trench and muck haulage under water;
3) broken dike;
4) coarse sand is filled out in throwing;
5) the basic bolster of pipe is handled;
6) hang the ship assembling;
7) water under the swing pipe;
8) hauling pipe;
9) transverse tube;
10) immersed tube;
11) foundation trench backfill;
12) be connected cofferdam construction with shore pipeline;
Above-mentioned steps 10) immersed tube in comprises the steps:
101) water inlet
After transverse tube is finished, open the outlet valve of two pipe ends, open water intake, adopt the entry of nature douche; Under unified command,, respectively hang ship and tighten up simultaneously or loosen anchor hawser and the same moved further of steel pipe, above steel pipe is in foundation trench fully, pipeline is the attitude of half-formed foundation trench in place the steel pipe moulding of slinging;
102) sink
Exhaust situation according to pipe ends is loosened wire rope by respectively hanging ship several times, and steel pipe is sunk gradually, and 0.2m sinks at every turn; Along with water constantly pours into, pipeline sinks gradually, and each suspension centre is constantly adjusted simultaneously, to guarantee the reasonable distribution of each suspension centre; In an orderly manner during the sinking process, manage the measurement monitoring work that center line and foundation trench axis are proofreaied and correct at pipeline; Respectively hang ship and move to reach and progressively aim at foundation trench axis and terminal position, two sides, until adhering to specification substantially;
When foundation trench has 0.3m, stop to sink when the pipe end, utilize the survey crew of two sides that the steel pipe axis is readjusted, after accurate,, respectively hang ship hoist cable is relaxed to the pretension state, stay original position and await orders under the unified command steel pipe being sink on the pipe basis;
The two sides, river course are provided with line traffic control stake and temporary bench mark in the pipeline, and every side should not be less than 2, the position that should be located at firm location and be convenient to observe, and take protective measure; Measurement and positioning was accurate when river crossing sank, and often school survey in sinking; It is stressed even that the two ends crane gear should keep when lifting, and the sinking pipeline is in place in bottom land synchronously;
103) pressure testing
Check whether the steel pipe position adheres to specification, carry out the operation of the tight intake pipe flange plate of bolt screw by water under the diver after confirming, carrying out the hydraulic pressure pressure testing then checks and accepts, the hydrostatic test specifically requires to carry out with reference to pipeline pressure test, when if pressure drop is excessive, again carry out fasteningly to the water inlet shrouding by the diver, the two sides personnel handle the leakage of pressure testing pipe fitting simultaneously, check and accept until pressure testing to reach qualified requirement;
104) location
Respectively hang the ship decomplexing after the pressure testing, stay original position, allow under the diver water place chockstone in the bolster both sides to stablize pipeline.
2. immersed pipe construction technique of river crossing pipe according to claim 1 is characterized in that above-mentioned steps 12) in be connected cofferdam construction with shore pipeline and comprise the steps:
121) measure unwrapping wire
Measure the workmen and emit the pipeline boundary of works area in construction according to perforated pipe or river crossing design attitude, and the scope in cofferdam;
122) cofferdam construction
The cofferdam is filled to adopt and is accounted for into method effluent limit and carry out to the korneforos; People's frock soil is gone into bag, and soil loading amount is about 2/3 of bag capacity, and sack is sewed up with linen thread or thin wire; Earth bag is transported to working surface by dump truck and unloads at the construction field (site), then by manually piling up the sand bag; During the pile earth bag, accomplish up and down that mutually the fissure of displacement, pile are neatly closely knit;
Sand surrounds the weir puts the slope at upstream face, and the gradient is 1: 1; The back side gradient is 1: 1.5, leaks in order to prevent the sand bag, at upstream face fibre cloth is set and carries out the sealing processing; The fibre cloth base pressure is under the sand bag, and the fibre cloth top adopts the sand bag pressure to live, the top absolute altitude than the cofferdam after highest water level exceed 50cm;
123) construction measures of preventing water
Still have the ground of seepage can cotton-wool, cloth etc. is stifled tight with it, the location that the part sealing does not live can adopt fibre cloth sealing and sand to surround the weir sealing; Need for handling special circumstances, prepare enough sandbags one and be equipped with the possible period of want or need;
Both sides all are provided with the gutter at the bottom of the foundation ditch, and every construction section is established four sumps, and draining the water away at any time with many Φ 100mm submersible pumps gets final product, and avoid river crossing foundation ditch hole subsoil earth to be soaked;
124) construction water guide measure
Adopt totally-enclosed cofferdam to construct,, intend adopting installation D1200 steel pipe to carry out water guide and handle for guaranteeing former flow; Steel pipe carries out the installation of aqueduct when cofferdam construction is at the bottom of the aqueduct designed elevation, aqueduct length is longer during the cofferdam construction of perforation hole, can add temporary rest pier and reinforce at the bottom of aqueduct; Proceed piling up of cofferdam sand bag after the aqueduct installation, until adopting the sand bag that aqueduct is pushed down;
125) draw water and substrate cleaning
The cofferdam pile up finish close up after, suction engine is installed is drawn water, the ponding in the cofferdam is drained; Draw water and the substrate in the cofferdam is cleared up after finishing, the foreign material that remove rubbish are conveniently to construct.
CN2008100289209A 2008-06-20 2008-06-20 Immersed pipe construction technique of river crossing pipe Active CN101315139B (en)

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CN102434719A (en) * 2011-08-28 2012-05-02 中国石油天然气集团公司 Construction technology for hierarchical excavation and pipeline sinking
CN103912721B (en) * 2014-04-23 2016-01-13 中国化学工程第三建设有限公司 A kind of method of construction of fluting, immersed tube river crossing under water
CN103912722B (en) * 2014-04-23 2016-01-13 中国化学工程第三建设有限公司 A kind of group of pipeline river crossing is to immersed tube method
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