The invention belongs to building field, relate to a kind of concrete reinforced pipe construction method of installation and steel concrete pipeline special fixture.
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In the past when reinforced concrete pipiline lifts, usually used punching to hang or bundle the method for hanging and carried out lifting operation.When using punching to hang, concrete mouth of pipe place is easily damaged by wire rope, and peace pipe time, for the ease of winning wire rope, pipe joint place stay in gap establish excessive, when using binding to hang, can solve the control problem in mouth of pipe gap, but Yin Pingji is formed, after causing pipeline in place, below road, the wire rope side of being crushed on, be difficult to win.
Traditional construction construction technology concrete reinforced pipe is installed, the frequent generator tube road mouth of pipe is by damaged in wire rope hoisting process, mouth of pipe dabbing is thorough, mortar comes off, crack, pipe joint imprecision, interface leaks, and closes the defective phenomenon of water, interface imprecision, cause pipeline cavity by current scour, depression occurs.
5, this method of construction should be applied in concrete reinforced pipe installing engineering, particularly the duration is tight, and concrete duct seal is high, under closing the high condition of water requirement, construction advantage is more obvious, has the remarkable advantages such as easy and simple to handle, the duration fast, cost province, construction safety.
4, adopt concrete interface agent, the cohesive force to concrete surface can be strengthened, have good water-fast, freezing and thawing performance, avoid coat of plaster hollowing, flake, interface mortar is caused to come off, water leakage phenomenon, improve and close water up-to-standard rate, improve reinforced concrete pipiline interface integrity, there is protection tubing interface, easy and simple to handle, efficiency is high, improve pipeline Integral sealing, reach and well close water effect, avoid because of remarkable advantages such as the pipeline cavity road depressions that causes of seepage, ensure people's life safety, reduce pipe-line maintenance expense simultaneously, social benefit is quite significant.Promotional value is had in reinforced concrete pipe construction.
3, smear the even mix of band mortar admixture asbestos long wool fiber, improve mortar characteristic, improve the intensity of mortar, smear seam construction to pipeline, interior out-seam joint filling process, avoids the easy drying shrinkage of mortar, crack, comes off, cause pipe joint water leakage phenomenon.
2, adopt dabbing machine to replace artificial chiseling, improve mouth of pipe dabbing effect and efficiency of construction, strengthen mouth of pipe mortar in conjunction with effect, avoid combining and closely do not cause infiltration.
This stone tongs well-designedly to obtain with improved experimental with reference to a large amount of jig Design document incorporation engineering actual conditions basis is carried out, compare with other method of construction, operating expenses is low and invest little, there is good Social benefit and economic benefit, in municipal engineering construction, have promotional value.
1, under concrete reinforced pipe in pipe process, adopt the lifting of steel concrete fixture, ensure pipeline balance in hoisting process, tubing remains level, increases work efficiency, concrete mouth of pipe place is avoided easily to be damaged by wire rope, solve the control problem in mouth of pipe gap, solve workman frequently dislodging wire rope and wire rope be crushed on below pipeline, be difficult to win problem, improve working efficiency, solve existing two kinds of drawbacks of hanging method.
The invention has the beneficial effects as follows:
Steel concrete pipeline special fixture of the present invention, the middle part inside claw and bottom are respectively with the auxiliary clamping plate parallel with steel concrete pipeline, and rubber fender is fixed on auxiliary clamping plate.
Steel concrete pipeline special fixture of the present invention, its special way is: comprise two hinged handles, the upper end of handle is provided with lanyard hole, and the lower end of handle is provided with aduncate semicircular arc claw, with rubber fender inside claw.
(3) belt construction is smeared: during pipeline peace pipe, adopt concrete interface agent uniform application pipe joint; Then carry out pipeline and smear belt construction, smear band mortar admixture asbestos long wool fiber, mortar quality is than being asbestos long wool fiber: cement: the ratio of yellow ground=1:3:6, and mechanical uniform mixing mortar, smears seam process to pipeline;
(2) mouth of pipe dabbing: mouth of pipe dabbing adopts hand-held concrete dabbing machine, and dabbing is even;
(1) the lower pipe of lifting: adopt the auxiliary steel concrete pipeline special fixture that uses of crane in groove inner lower tube, during lifting, fixture lengthwise centers aligns with duct length center, and interface is in place, and keeps balance in hoisting process;
Concrete reinforced pipe construction method of installation of the present invention, its special way is: comprise the following steps:
The present invention is achieved through the following technical solutions:
The present invention in order to make up the deficiencies in the prior art, provide a kind of good leak tightness, closed-water test effective, fast concrete reinforced pipe construction method of installation and steel concrete pipeline special fixture are installed.
Embodiment
Accompanying drawing is a kind of specific embodiment of the present invention.
Concrete reinforced pipe construction method of installation of the present invention, comprises the following steps:
(1) the lower pipe of lifting: adopt the auxiliary steel concrete pipeline special fixture that uses of crane in groove inner lower tube, during lifting, fixture lengthwise centers aligns with duct length center, and jointing gap is in place, and keeps balance in hoisting process;
(2) mouth of pipe dabbing: mouth of pipe dabbing adopts hand-held concrete dabbing machine, and dabbing is even;
(3) belt construction is smeared: during pipeline peace pipe, adopt concrete interface agent uniform application pipe joint; Then carry out pipeline and smear belt construction, smear band mortar admixture asbestos long wool fiber, mortar quality is than being asbestos long wool fiber: cement: the ratio of yellow ground=1:3:6, and mechanical uniform mixing mortar, smears seam process to pipeline;
(4) base construction;
(5) closed-water test.
Steel concrete pipeline special fixture of the present invention, comprise two hinged handles 1, the upper end of handle is provided with lanyard hole 2, and the lower end of handle is provided with aduncate semicircular arc claw 3, with rubber fender inside claw.Middle part inside claw and bottom are respectively with the auxiliary clamping plate 4 parallel with steel concrete pipeline, and rubber fender is fixed on auxiliary clamping plate.
detailed step is as follows:
1 surveying and locating
Plan-position and the elevation such as built pipeline, structure that are connected with this engineering should be surveyed in school before going into operation.During measurement, first measuring channel center line and inspection shaft position, arrange construction control stake in pipeline turning, bifurcation and spread out lime line to excavate, and sets up level instrument carry out tracking measurement when mechanical equivalent of light excavation is constructed.
channel excavation
(1) before channel excavation, should investigate according to construction needs, grasp situation and engineering geology, hydrogeologic data, the drainage condition of pipeline site contour, landforms, building, various pipeline and other facilities along the line, and work out drainaging scheme.
(2) channel excavation process controls cutting depth in time, prevents from backbreaking; Groove center line should be recovered after channel excavation in time and control elevation, adopting and gradient plate is set to carry out elevation, center line control, whether accurately to check gradient plate setting position and elevation at any time, guarantee groove center line, the gradient and auxiliary construction correct position.
(3) width of groove should be convenient to pipe laying, installation, and compacting facility operate and underground water is discharged.The minimum width of groove should be calculated as follows to be determined:
b≥D1+2S
The minimum width (mm) of b--groove in formula;
D1--pipe external diameter (mm);
S--tube wall, to the distance (mm) of trench wall, is determined by table 5.2.2.
(4) steepest gradient of groove side slope should be determined according to groove soil property, and trench wall should arrange support or backplate if desired, and works out emergency preplan.Earth excavation adopts mechanical equivalent of light excavation, and bottom land reserves 20cm by the artificial clear end, and digging process is forbidden to backbreak, in case disturbance ground.
(5) static load or dynamic load should not be set on top, weak soil groove slope; When needing to arrange, the bearing capacity of reply soil and the stability of side slope check.
(6) when groove digs deeply larger, should by the degree of depth of reasonable mechanical performance determination stage excavation.
(7) groove timbering
According to soil property and the groundwater condition of job site, groove will carry out slope retaining.Groove supports general point veneer support, the support of well word, rare support, close support, grooved pile etc., according to situations such as on-the-spot soil property, level of ground water, groove depth, construction seasons and trough rim buildings, selects supporting type.
based process
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(1) when bearing capacity of soil be 8 ~ 100KPa and non-rock time should adopt based on undisturbed soil; When bearing capacity of soil is 5 ~ 70KPa, should adopt based on the original soil after compacting, compacted density should reach 95%.
(2) groove bottom is met mud, cobble, rock, hard soil, irregular crushed stone and is soaked soil property and should excavate the process of rear work corresponding pipe base.Pipeline should carry out the reinforcing of pipe base by designing requirement through unfavorable geology.
pipeline foundation
Groove formed qualified by inspection after, carry out piping foundation construction.Make pipe centerline by survey crew electronic tachometer before foundation construction, and measure elevation on Center stake, basic elevation and degree of compaction will strictly control.Basis is divided into 120 ° of concrete bases, 180 ° of reinforced concrete bases, sand encapsulation basis and concrete encapsulating bases.
pipe installing
The lower pipe of 1 fixture lifting
(1) first carry out safety technique to Field Force to tell somebody what one's real intentions are, check crane vehicle mass, guarantee operational excellence, and running construction in payload, check the closed whether smooth of steel concrete pipeline special fixture, ensure wire rope and crane and special fixture firm and reliable connection.
(2) this engineering method is managed under adopting human assistance 16T crane to use steel concrete pipeline special fixture, during lower pipe, according to ambient conditions such as groove width, the degree of depth, soil properties, determines that crane is deposited apart from the distance of trough rim, tubing, traffic route etc.People must not be had except staff, to guarantee safety in the crane turning radius.
(3) before lifting pipeline, guarantee that fixture is clipped in pipeline center, ensure pipeline center and hoisting wirerope roughly on one wire, first carry out examination before lifting to hang, first sling overhead 100mm, after guaranteeing situation without exception, can hang in groove, and have special messenger to command, forbid under the gib arm of crane stand people.During lifting, fixture lengthwise centers aligns with duct length center, and jointing gap is in place, and keeps balance in hoisting process.
(4), when pipeline is soon close to bottom land, reduces pipeline rate of descent, make pipeline steady fall to bottom land, then continue downward convergent-divergent wire rope certain length, conveniently pull down steel concrete special fixture, lifting clamp to reach, continue next root lifting pipeline, repeat lifting successively.
(5) during Pipe installing, also firm according to control stake control flow check water level elevation.Be as the criterion with absolute altitude at the bottom of bore during underwater pipeline stabilizing.Adjustment pipeline elevation, cushion block used must be firm, and this engineering is intended adopting Prefabricated Concrete correcting wedge underwater pipeline stabilizing, and ensures that cushion block is placed steadily.
(6) pipeline center controls to adopt sideline and center line bilinear con-trol, to ensure that elevation and plan-position meet the requirements.
(7) underwater pipeline stabilizing order from downstream row upstream, ensures following quality requirement: tube hub position permissible error 20mm during underwater pipeline stabilizing; Elevation permissible error ± 10mm at the bottom of pipe; In adjacent 2-section pipe mouth, the end discrepancy in elevation is not more than 3mm.
2. mouth of pipe dabbing
Mouth of pipe dabbing adopts hand-held concrete dabbing machine, and replace artificial chiseling, type is little, easy to use, the cutter that can be 24000-50600 time per minute hits frequency, and cutter per hour hits area can reach 30-100 square metre by different concrete strength, reduces the destruction to tubing simultaneously.Dabbing head is become by two high high-quality tungsten steel alloy dabbing boots head groups, and air compressor provides machine power.The working life of dabbing boots head, easy to operate, efficiency of construction was high at more than 3000m2, and to tubing without breakage, dabbing is effective, smeared band in conjunction with effective.
3 interfacial agents smear belt construction
During pipeline peace pipe, for ensure smear band mortar can with steel concrete good bonding, ensure the integrity of interface and pipeline, adopt Product Interface agent to smear pipe joint to construct, smear evenly, the cohesiveencess of reinforced mortar and the concrete mouth of pipe, ensures the seal of mortar and concrete pipe bond effect and pipeline.
Concrete interface agent is a kind of polymer-modified cement mortar, the cohesive force to basic unit can be strengthened, the phenomenon have good water-fast, wet-heat resisting, freezing and thawing performance, avoiding coat of plaster hollowing, flake, is mainly used in the concrete mouth of pipe and smears the junction of being with mortar.
4. smear belt construction
After interfacial agents smears the mouth of pipe, carry out pipeline and smear belt construction, smear band mortar admixture asbestos long wool fiber, mechanical uniform mixing mortar, mortar quality is than being asbestos long wool fiber: cement: the ratio of yellow ground=1:3:6, seam process is smeared to pipeline.First the asbestos long wool fibre mortar mixed should be filled in interface during interface, and reality beaten by layering special tool, should carry out the moisture-keeping maintaining of interface after having beaten mouth.
5. base construction
Pipe installing is complete and after carrying out passed examination to elevation and center line off normal, can carry out the construction of base.Base construction adopts and manually installs set shaped steel formwork, Cast-in-place concrete in groove, and the artificial vibrating spear that uses vibrates shaping, covers straw screen or mat, watering health.
6 closed-water tests
Closed-water test must be carried out before pipeline backfill
(1) following work is carried out before closed-water test
Pipeline and inspection shaft appearance quality inspected qualified; Without ponding in groove; Whole reserving hole after shutoff etc. satisfies the requirements, carries out sewage conduct closed-water test.
(2) method of inspection
By the mouth of pipe shutoff of pipe ends, water filling in the inspection shaft closing water section, after filling water in pipe, soak time is no less than 24h, and pipeline is fully soaked into; Start timing when test head reaches regulation head, observe the water percolating capacity of pipeline, until at the end of observation, constantly to moisturizing in pipe, keep test head constant, the observation time of water percolating capacity must not be less than 30 minutes.Can earthing after pass the test, and interface does not allow before closing water with slush or other materials jointing.Water percolating capacity will be surveyed show to compare with " drainage pipe closed-water test allows water percolating capacity ", determine that whether this section is qualified.
Drainage pipe closed-water test allows water percolating capacity to see GB50268-2008.
Pipeline actual measurement water percolating capacity is calculated as follows: q=W/T*L
Q in formula-actual measurement water percolating capacity (m3/d.km);
Water percolating capacity (m3) during the observation of W-close waterpipe;
T-actual measurement water percolating capacity observation time (d); L-close water pipe segment length (km).
Pipeline allows water percolating capacity to be calculated as follows:
;
Q in formula-permission water percolating capacity (m
3/ d.km)
D-internal diameter of the pipeline (mm)
As q≤Q, test as qualified.
7. trench backfill
(1) after pipeline connects, must backfill as early as possible, prevent pipeline from moving and be destroyed.Answer selecting properly area under control backfilling material during backfill, and carry out area under control backfill and compacting by designing requirement, tube seat section is see figure below.
(2) foreign material in groove should be removed before backfill, and drain the water away, must not backfill having in ponding situation.Pipe top thickness of earth-fill cover should meet designing requirement, when pipeline earthing is more shallow, the bearing capacity of pipeline is lower, the load of compactor is larger, or original soil backfill is not when reaching the degree of compaction of requirement, can consult to adopt rendzinas, sand, gravel etc. to have structural strength maybe can meet the requirements of other material backfill with architect.
(3) area under control should symmetrical back-filling in layers, forbids one-sided backfill.Each backfill thickness should be determined according to backfilling material and earth-filling method, and refilling step need meet " code for construction and acceptance of water supply and sewerage pipeline engineering " GB50268 and specify.
the situation applied and promoted:
Through my company updating for many years, field practice, defines fixture lifting concrete reinforced pipe construction and solves common quality defect in reinforced concrete pipiline installation process.This engineering method prolongs engineering in the pulp-water spring south of road, Jinan City, Beijing West Railway Station of Jinan City municipal engineering (first phase) three bid section, Jinan City's culture (east, west) be applied in the drainage works of way road, wherein engineering is prolonged in Jinan City's pulp-water spring south of road, Jinan City's culture (east, west) drainage works of way road wins the prize of Jinan City golden cup, this engineering method solves concrete reinforced pipe mouth of pipe place and is easily damaged by wire rope, the control problem in mouth of pipe gap, workman frequently dislodging wire rope and wire rope is crushed on below pipeline, be difficult to win problem, mouth of pipe dabbing efficiency, smear band mortar strength low, mortar is combined not tight with pipeline, seepage problem.Ensure that the leakproofness of pipe joint, reach and close water effect.Wide application space and promotional value is had in the installation of municipal engineering concrete reinforced pipe.
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