CN103912722B - A kind of group of pipeline river crossing is to immersed tube method - Google Patents
A kind of group of pipeline river crossing is to immersed tube method Download PDFInfo
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- CN103912722B CN103912722B CN201410166762.9A CN201410166762A CN103912722B CN 103912722 B CN103912722 B CN 103912722B CN 201410166762 A CN201410166762 A CN 201410166762A CN 103912722 B CN103912722 B CN 103912722B
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- riverbed
- immersed tube
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/12—Laying or reclaiming pipes on or under water
- F16L1/16—Laying or reclaiming pipes on or under water on the bottom
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/12—Laying or reclaiming pipes on or under water
- F16L1/16—Laying or reclaiming pipes on or under water on the bottom
- F16L1/161—Laying or reclaiming pipes on or under water on the bottom the pipe being composed of sections of short length
Abstract
The group that the invention discloses a kind of pipeline river crossing, to immersed tube method, belongs to tubing technical field under water.The steps include: (1) pipeline stringing, its group comprises pre-group to process and pontoon group to process to process, on bank, river, to pipeline pre-group carried out to pipeline and the second pre-group to the first pre-group right, and at its end face labeling position dot information, pontoon platform completes the group of the first riverbed straight length and the second riverbed straight length to process; (2) pipeline immersed tube, integrated piping sinker technique is adopted in its pipeline immersed tube process, and the first elbow section place on pipeline fastens the first buoy, fastening the second buoy at the second elbow section place, guaranteeing that pipeline accurately sinks in pipe trench by controlling the first valve, on center line that the second valve, the first buoy, the second buoy remain at pipe trench.The present invention accurately can control sinking in the pipe trench of specifying of whole pipeline stabilization, and control accuracy is high.
Description
Technical field
The present invention relates to tubing technical field under water, more particularly, relate to a kind of group of pipeline river crossing to immersed tube method.
Background technique
In the work progress of natural gas pipeline projects, pipeline river crossing is " project of primary importance " in pipeline construction, and not only technical difficulty is high, and investment is many, and long in time limit, has a big risk.Pipeline river crossing requires higher to the hydrological geological conditions in river, and especially for the river of following situation, difficulty of construction is larger: do not open the navigation or air flight in (1) river, two sides do not have highway, and riverbank is nature riverbank; (2) river is clipped between two mountains, and the two sides gradient is comparatively large, and limit of pulling in shore, riverbed is rock, is organic silt in the middle of riverbed; (3) river is in Pipeline Crossing Program place river surface wider width, and the riverbed degree of depth is comparatively dark, and river surface water velocity is very fast.
In above-mentioned River Hydrology geological condition, because riverbed is comparatively dark, water flow is large, and cofferdam method should not be adopted to construct; Again because there is rock in riverbed, geological condition is complicated, and directional drilling method should not be adopted to construct.Therefore, relatively more suitable method only has fluting, Immersed tunnel method under water, but the difficulty of construction of " under water fluting, Immersed tunnel method " is very large, be mainly reflected in following two aspects: (1) is middle for riverbed is organic silt, limit of pulling in shore, riverbed is the Complicated Geologic Condition of rock, how to complete pipe canal digging work fast, be the huge test to the construction period; (2) how pipeline being put into pipe trench accurately, reduce error simultaneously as far as possible, for this problem, is the great difficult problem of puzzlement " under water slot, Immersed tunnel method " smooth construction, and technological scheme of the prior art all fails solution.
By patent retrieval, the technological scheme about " under water fluting, Immersed tunnel method " is existing open.As China Patent No. ZL200410023552.0, authorized announcement date is on May 17th, 2006, invention and created name is: construction method for river crossing pipeline, this application case discloses a kind of method of construction of pipeline river crossing, long-armed power shovel is adopted to carry out ditching under water on self-control buoyancy tank, then by prefabricated crossing pipeline two ends shutoff, utilize the characteristic that closed conduit can be floating on the water, drift about to cross the river with construction equipment in placely make it sink in pipe trench to water filling in pipeline again by sending ditch traction pipeline, last pressure pipe is firm and backfill, its working procedure is: preparation of construction, surveying setting-out, ditching under water, drift pipe immersed tube and underwater pipeline stabilizing backfill.
And for example, China Patent No. ZL200810028920.9, authorized announcement date is on June 8th, 2011, and invention and created name is: a kind of immersed pipe construction technique of river crossing pipe, and this application case comprises the steps: 1) shore pipeline is shaping; 2) foundation trench excavation and muck haulage under water; 3) broken dike; 4) throwing coarse sand; 5) pipe basis bolster process; 6) ship assembling is hung; 7) water under swing pipe; 8) hauling pipe; 9) transverse tube; 10) immersed tube; 11) foundation trench backfill; 12) cofferdam construction is connected with shore pipeline.Above-mentioned two application cases to some extent solve the problem of pipeline river crossing, but its technological scheme finds all accurately pipeline to be put into pipe trench by repeatedly doing simulation, and its error is comparatively large, causes difficulty of construction large.
Summary of the invention
1. invent the technical problem that will solve
The object of the invention is to overcome the pipeline stringing in the construction of prior art pipeline river crossing and the irrational deficiency of pipeline immersed tube technology, provide a kind of group of pipeline river crossing to immersed tube method, adopt technological scheme of the present invention, what accurately can control whole pipeline stabilization sinks in the pipe trench of specifying, make it sit in the right seat, ensure carrying out smoothly of work progress.
2. technological scheme
For achieving the above object, technological scheme provided by the invention is:
The group of a kind of pipeline river crossing of the present invention, to immersed tube method, the steps include:
Step one, pipeline stringing
Pipeline stringing comprises group to, welding, weld seam detection, carries out electrical spark, carrying out flaw detection after weld seam detection, wherein: described group is to comprising pre-group to process and pontoon group to process, specific as follows:
(I), pre-group is to process
Described pipeline is divided into the first pre-group to pipeline and the second pre-group to pipeline, this first pre-group comprises the first slope, river section, the first elbow section and the first riverbed straight length to pipeline, completes the welding successively of the first slope, river section, the first elbow section, the first riverbed straight length on bank, river, this second pre-group comprises the second slope, river section, the second elbow section and the second riverbed straight length to pipeline, also the welding successively of the second slope, river section, the second elbow section, the second riverbed straight length is completed on bank, river, simultaneously, in the upper end of the first slope, river section, the first valve is installed, in the upper end of the second slope, river section, the second valve is installed, complete the first pre-group to pipeline and the second pre-group to after each self assembly of pipeline, lineup clamp is used on bank, river, it is right that sideboom tractor carries out pre-group to pipeline and the second pre-group to pipeline to the first pre-group, guarantee that the first elbow section and the second elbow section are in same level, and mark on the end face of the first riverbed straight length and the end face of the second riverbed straight length, be specially: on the end face of the first riverbed straight length, mark location point A1, B1, C1 and D1, the end face of the second riverbed straight length marks location point A2, B2, C2 and D2, above-mentioned location point A1 is corresponding with location point A2, by that analogy,
(II), pontoon group is to process
After the pre-group of completing steps (I) is to process, first the first pre-group is drawn in river to pipeline, one end wherein with the first valve swims on the water surface due to the buoyancy of self, and its other end with labeling position point rests in the pontoon platform in the excavation floating pontoon arrangement on bank; Then dilatory second pre-group is to pipeline, one end with labeling position point is also rested in the pontoon platform on bank, make the first riverbed straight length end face marks location point A1, B1, C1, D1 respectively with the second riverbed straight length end face mark location point A2, B2, C2, D2 match; Wherein: described excavation floating pontoon arrangement comprises pontoon platform, first hoist, second hoist and excavator, the first anchor point and the 3rd anchor point is provided with in the side on bank, river, the opposite side on bank, river is provided with the second anchor point and the 4th anchor point, the first above-mentioned anchor point is connected by the first guide line with the second anchor point, and this first guide line interts in pontoon platform; The 3rd above-mentioned anchor point is connected by the second guide line with the 4th anchor point, and this second guide line also interts in pontoon platform, and the first guide line and the second guide line all parallel with pipe trench, and this first guide line and the second guide line are used for fixing pontoon platform; Pontoon platform is fixed with first hoist and second hoist, first hoist is connected with the second anchor point by its wire rope, second hoist is connected with the 4th anchor point by its wire rope, by controlling first hoist and second hoist work, drive pontoon platform on the water surface, moved back and forth pipe canal digging work; Excavator is positioned in pontoon platform; After above-mentioned group completes process, the end face of the end face of the first riverbed straight length and the second riverbed straight length is welded and fixed and carries out weld seam detection, after completing integrated piping welding, by controlling first hoist and the motion of second hoist driving pontoon platform, the excavator in pontoon platform and the excavator on bank match and are transported on river surface by integrated piping;
Step 2, pipeline immersed tube
Pipeline immersed tube is carried out in place after the pipeline stringing of completing steps one, its pipeline immersed tube process is specific as follows: on pipeline, be equipped with balancing weight, balancing weight is C30 concrete, the weight of every block balancing weight is 100kg, the Lay interval of adjacent two pieces of balancing weights is 10 meters, in addition, the first elbow section place on pipeline fastens the first buoy, the second buoy is fastened at the second elbow section place, one, excavator is respectively established on bank, river two, use the excavator in pontoon platform in the middle of river, utilize three excavators by pipeline handling in river; Simultaneously, the central position of pipe trench is determined and electronic tachometer on frame on the bank in river, the position of the first valve, the second valve, the first buoy, the second buoy is controlled by electronic tachometer, by the first valve on pipeline and the second valve open, to be poured water in pipeline immersed tube by inlet valve, speed during pipeline immersed tube is wanted evenly, and the first slope, river section and the second slope, river section will balance sinking; In pipeline immersed tube process, during three excavators control immersed tube that utilization arranges, current are to the effect of pipeline, the amplitude that adjustment pipeline swings in river, guarantee that the first valve, the second valve, the first buoy, the second buoy remain on the center line of pipe trench, if depart from the position of pipe trench in pipeline commissioning process, then adjust in time, guarantee that pipeline entirety sinks in pipe trench.
As further improvement of the present invention, the pontoon platform in step one comprises steel pipe and the I-steel of closed at both ends, and steel pipe is laid out in parallel, and I-steel is fixed by welding and steel pipe two ends, and the steel pipe of laid out in parallel is equipped with plank.
As further improvement of the present invention, the repetition measurement of immersed tube is carried out after pipeline immersed tube in step 2, the repetition measurement process of immersed tube adopts mark post mechanism to carry out, this mark post mechanism comprises steel pipe mark post main body and magnet, described magnet is fixed on the bottom of steel pipe mark post main body, by the repetition measurement of magnet adsorption complete twin conduit on pipeline.
3. beneficial effect
Adopt technological scheme provided by the invention, compared with prior art, there is following remarkable result:
(1) group of a kind of pipeline river crossing of the present invention is to immersed tube method, its group comprises pre-group to process and pontoon group to process to process, use on bank, river lineup clamp, sideboom tractor carry out organizing in advance to pipeline to pipeline and the second pre-group to the first pre-group right, and at its end face labeling position dot information; In addition, pontoon platform completes the group of the first riverbed straight length and the second riverbed straight length to process, make the assembling precision of integrated piping high, for sinking in the pipe trench of specifying of pipeline stabilization provides technical foundation, coordinate pipeline immersed tube process, what make it possible to accurately to control whole pipeline stabilization sinks in the pipe trench of specifying;
(2) group of a kind of pipeline river crossing of the present invention is to immersed tube method, integrated piping sinker technique is adopted in its pipeline immersed tube process, and the first elbow section place on pipeline fastens the first buoy, the second buoy is fastened at the second elbow section place, guarantee that pipeline accurately sinks in pipe trench by controlling the first valve, on center line that the second valve, the first buoy, the second buoy remain at pipe trench, control accuracy is high, and constructing operation is easy to realize.
Accompanying drawing explanation
Fig. 1 is the construction process figure of pipeline river crossing;
Fig. 2 is the excavation floating pontoon arrangement structural representation in the present invention;
Fig. 3 is that in the present invention pre-group is to process schematic, wherein: figure (a) is that the first pre-group carries out the right structural representation of pre-group to pipeline and the second pre-group to pipeline, figure (b) is the endface position point mark schematic diagram of the first pre-group to pipeline, and figure (c) is the endface position point mark schematic diagram of the second pre-group to pipeline;
Fig. 4 is the pipeline immersed tube schematic diagram in the present invention;
Fig. 5 is the concreting underwater pipeline stabilizing schematic diagram in the present invention.
Label declaration in schematic diagram:
1, pontoon platform; 21, first hoist; 22, second hoist; 3, funnel is built; 4, excavator; 51, the first anchor point; 52, the second anchor point; 53, the 3rd anchor point; 54, the 4th anchor point; 61, the first guide line; 62, the second guide line; 7, pipe trench; 8, pipeline; 81, the first pre-group is to pipeline; 82, the second pre-group is to pipeline; 91, the first buoy; 92, the second buoy; 101, the first valve; 102, the second valve; 111, the first slope, river section; 112, the second slope, river section; 121, the first elbow section; 122, the second elbow section; 131, the first riverbed straight length; 132, the second riverbed straight length.
Embodiment
For understanding content of the present invention further, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.
Embodiment 1
Pipeline river crossing is constructed, and conventional cofferdam water conservancy diversion method construction is applicable to the situation that riverbed is more shallow, water flow is less.Have rock for riverbed, the river of geological condition complexity, directional drilling method construction is also not suitable for.The present embodiment for be the engineering in Gas Pipeline Crossing river in natural gas pipeline projects, the hydrological geological conditions in this river is as follows: a), river do not open the navigation or air flight, and two sides do not have highway, belong to nature riverbank; B), river is clipped between two mountains, and the two sides gradient is comparatively large, and limit of pulling in shore, riverbed is rock, is organic silt in the middle of riverbed; C), river is 110m at Pipeline Crossing Program place river surface width, and the riverbed degree of depth is 4 ~ 5m, and river surface water velocity is very fast.Through retrieval related documents data, the river crossing construction comparatively complicated for the such hydrology in this river, geological condition, water flow is larger, in prior art, the technology such as existing cofferdam, Directional Drilling all can not solve this type of construction difficult problem, the difficult point of its key is how pipeline is put into pipe trench accurately, reduce error simultaneously as far as possible.
Claimant is on the basis of summing up Large River Crossing construction experience in the past, off the beaten track, take stage excavation technology that underwater excavation process and underwater demolition process combine, the novel construction method of docking technique, overall immersed tube etc. that the first pre-group matches to process to process and pontoon group to the prefabricate technology of pipeline, pre-group to pipeline and the second pre-group a series of " slot under water, immersed tube pass through ", what make it possible to accurately to control whole pipeline stabilization sinks in the pipe trench of specifying, make it sit in the right seat, guarantee that the construction of pipeline river crossing is carried out smoothly.
The group of a kind of pipeline river crossing of the present embodiment, to immersed tube method, comprises pipeline stringing and pipeline immersed tube process, before pipeline stringing, has carried out preparation of construction, at pipeline immersed tube after-pouring concrete underwater pipeline stabilizing and pipeline backfill, river recovery.Its Specific construction process following (as shown in Figure 1):
Step one, preparation of construction
Preparation of construction in step one comprises surveying setting-out, pipe canal digging and pipeline transport, carries out surveying setting-out according to river regime, determines position and the excavation width of pipe trench 7.Pipe canal digging comprises underwater excavation process and underwater demolition process, described underwater excavation process adopts excavation floating pontoon arrangement to carry out, excavate floating pontoon arrangement for excavating the organic silt in riverbed, described excavation floating pontoon arrangement comprises pontoon platform 1, first hoist 21, second hoist 22, build funnel 3 and excavator 4, the first anchor point 51 and the 3rd anchor point 53 (as shown in Figure 2) is provided with in the side on bank, river, the opposite side on bank, river is provided with the second anchor point 52 and the 4th anchor point 54, the first above-mentioned anchor point 51 is connected by the first guide line 61 with the second anchor point 52, this first guide line 61 interts in pontoon platform 1, the 3rd above-mentioned anchor point 53 is connected by the second guide line 62 with the 4th anchor point 54, this second guide line 62 also interts in pontoon platform 1, first guide line 61 and the second guide line 62 all parallel with pipe trench 7, and this first guide line 61 and the second guide line 62 are for fixing pontoon platform 1.
Pontoon platform 1 in the present embodiment is fixed with first hoist 21 and second hoist 22, first hoist 21 is connected with the second anchor point 52 by its wire rope, second hoist 22 is connected with the 4th anchor point 54 by its wire rope, worked by control first hoist 21 and second hoist 22, drive pontoon platform 1 on the water surface, moved back and forth pipe canal digging work.Pontoon platform 1 is also provided with and builds funnel 3 and excavator 4, excavator 4 is for excavating organic silt and the blasting broken stone in riverbed, and the bottom of building funnel 3 is positioned at the top of pipe trench 7, this build funnel 3 for by concreting at pipeline 8.Concrete pontoon platform 1 comprises steel pipe and the I-steel of closed at both ends, and steel pipe is laid out in parallel in the present embodiment, and I-steel is fixed by welding and steel pipe two ends, and the steel pipe of laid out in parallel is equipped with plank.
Underwater demolition process in the present embodiment is used for the rock in explosion riverbed, and rock is after explosion, and its blasting broken stone excavates further by excavating floating pontoon arrangement, and the blasting broken stone excavating the water surface is transported to bank process.
Step 2, pipeline stringing
After step one completes preparation of construction, carry out pipeline stringing, pipeline stringing comprise group to, welding, weld seam detection, carry out electrical spark, carrying out flaw detection after weld seam detection.Because overall welding, difficulty of going to river are comparatively large, the present embodiment implementation segmentation is gone to river, bank is welded, the construction sequence of integral sinking.Group comprises pre-group to process and pontoon group to process to process, and detailed process is as follows:
(I), pre-group is to process
Pipeline 8 in the present embodiment is divided into the first pre-group to pipeline 81 and the second pre-group to pipeline 82, this first pre-group comprises the first slope, river section 111, first elbow section 121 and the first riverbed straight length 131 to pipeline 81, completes the welding successively of the first slope, river section 111, first elbow section 121, first riverbed straight length 131 on bank, river; This second pre-group comprises the second slope, river section 112, second elbow section 122 and the second riverbed straight length 132 to pipeline 82, also the welding successively of the second slope, river section 112, second elbow section 122, second riverbed straight length 132 is completed on bank, river, simultaneously, in the upper end of the first slope, river section 111, first valve 101 is installed, in the upper end of the second slope, river section 112, second valve 102 is installed.
Complete the first pre-group to pipeline 81 and the second pre-group to after each self assembly of pipeline 82, use on bank, river lineup clamp, sideboom tractor carry out organizing in advance to pipeline 82 to pipeline 81 and the second pre-group to the first pre-group right, guarantee that the first elbow section 121 and the second elbow section 122 are in same level, and mark on the end face of the first riverbed straight length 131 and the end face of the second riverbed straight length 132.As shown in Figure 3, wherein: figure (a) is that the first pre-group carries out the right structural representation of pre-group to pipeline 81 and the second pre-group to pipeline 82, figure (b) is the endface position point mark schematic diagram of the first pre-group to pipeline 81, figure (c) is the endface position point mark schematic diagram of the second pre-group to pipeline 82, concrete mark situation is as follows: on the end face of the first riverbed straight length 131, mark location point A1, B1, C1 and D1, the end face of the second riverbed straight length 132 marks location point A2, B2, C2 and D2, above-mentioned location point A1 is corresponding with location point A2, by that analogy.
(II), pontoon group is to process
After the pre-group of completing steps (I) is to process, first the first pre-group is drawn in river to pipeline 81, one end wherein with the first valve 101 swims on the water surface due to the buoyancy of self, and its other end with labeling position point rests in the pontoon platform 1 on bank; Then dilatory second pre-group is to pipeline 82, one end with labeling position point is also rested in the pontoon platform 1 on bank, make the first riverbed straight length 131 end face marks location point A1, B1, C1, D1 respectively with the second riverbed straight length 132 end face mark location point A2, B2, C2, D2 match.After above-mentioned group completes process, the end face of the end face of the first riverbed straight length 131 and the second riverbed straight length 132 is welded and fixed and carries out weld seam detection, after completing integrated piping 8 welding, drive pontoon platform 1 to move by controlling first hoist 21 and second hoist 22, the excavator 4 in pontoon platform 1 and the excavator on bank match and to be transported on river surface by integrated piping 8.Pipeline 8 carries out pressure test after connecting into entirety, and for pipeline 8 during guarantee pressure testing does not sink, reduce the bearing capacity of pontoon platform 1, pressure pressure testing adopts pneumatic test simultaneously.Before pressure test, all pipelines and system should be checked, guarantee to test part not to be covered completely isolated; After having tested, immediately test pressurization manifold is separated with by pressure testing system.The group completing the first riverbed straight length 131 and the second riverbed straight length 132 in the present embodiment in pontoon platform 1, to process, makes the assembling precision of integrated piping 8 high, for sinking in the pipe trench 7 of specifying of pipeline stabilization provides technical foundation.
Step 3, pipeline immersed tube
After the pipeline stringing of completing steps two, review at pipe trench 7, pipeline 8 pressure test, pipeline 8 after the assay was approved anticorrosion, it is in place to carry out pipeline immersed tube, and its pipeline immersed tube process is specific as follows:
Pipeline 8 is equipped with balancing weight, balancing weight is C30 concrete, the weight of every block balancing weight is 100kg, the Lay interval of adjacent two pieces of balancing weights is 10 meters, and in addition, the first elbow section 121 place on pipeline 8 fastens the first buoy 91, the second buoy 92 is fastened at the second elbow section 122 place, respectively establish 4 one, excavator on bank, river two, use the excavator 4 in pontoon platform 1 in the middle of river, utilize three excavators 4 by pipeline 8 handling in river.Simultaneously, the central position of pipe trench 7 is determined and electronic tachometer on frame on the bank in river, the position of the first valve 101, second valve 102, first buoy 91, second buoy 92 is controlled by electronic tachometer, the first valve 101 on pipeline 8 and the second valve 102 are opened, to be poured water in pipeline 8 immersed tube by inlet valve, speed during pipeline 8 immersed tube is wanted evenly, and the first slope, river section 111 and the second slope, river section 112 will balance sinking.Pipeline immersed tube process as shown in Figure 4, when utilizing three excavators 4 arranging to control immersed tube, current are to the effect of pipeline 8, the amplitude that adjustment pipeline 8 swings in river, guarantee that the first valve 101, second valve 102, first buoy 91, second buoy 92 remains on the center line of pipe trench 7, if depart from the position of pipe trench 7 in pipeline 8 sinking watching, then adjust in time, guarantee that pipeline 8 entirety sinks in pipe trench 7.The repetition measurement of immersed tube is carried out after pipeline immersed tube, the repetition measurement process of immersed tube adopts mark post mechanism to carry out, this mark post mechanism comprises steel pipe mark post main body and magnet, and described magnet is fixed on the bottom of steel pipe mark post main body, by the repetition measurement of magnet adsorption complete twin conduit 8 on pipeline 8.
Pipeline immersed tube process guarantees that pipeline 8 accurately sinks to the important construction stage in pipe trench 7, claimant once determined several feasible scheme through discussion, by repeatedly doing simulation, this several scheme is screened, finally determine by controlling the first elbow section 121 on whole pipeline 8 and the second elbow section 122 carries out underwater pipeline stabilizing, determine straight line at 2, as long as control the position of the first elbow section 121 and the second elbow section 122 well, make it sit in the right seat, so whole pipeline 8 also just can be stabilized to the position of specifying, and this is one of innovative point of key of the present invention.The present embodiment remains at pipe trench 7 center line by controlling the first valve 101, second valve 102, first buoy 91, second buoy 92 guarantees that pipeline 8 accurately sinks in pipe trench 7, and control accuracy is high, and constructing operation is easy to realize.
Step 4, concreting underwater pipeline stabilizing
After step 3 pipeline immersed tube is in place, first the braided bag installing stone is thrown to river bed, carry out preliminary underwater pipeline stabilizing, then build non-dispersible underwater concrete and carry out final underwater pipeline stabilizing, wherein, the detailed process of building non-dispersible underwater concrete is as follows:
The particular location of pipeline 8 is first found out with magnet, then in pontoon platform 1, funnel 3 is fixedly built, this vertical motion of building funnel 3 is controlled by guide chain, guide chain is pulled to make to build funnel 3 perpendicular to pipeline 8 and the top of building the bottom distance pipeline 8 of funnel 3 is 50cm, again by concrete delivery pipe by concrete conveyance to building in funnel 3 (as shown in Figure 5), by the width of pipe trench 7 and concrete slump calculate a certain immovable point build funnel 3 below needed for the amount of concrete of building, stop when being poured into and calculating required amount of concrete, the situation of building is observed by underwater camera, building of next immovable point is carried out after concrete covers pipeline 8 top 30cm, otherwise continue to build until the top of pipeline 8 covers the thick concrete of 30cm, wherein: concrete is C30 concrete, flocculant usage is 2% of cement consumption.
Step 5, pipeline backfill, river recovery
After step 4 pipeline underwater pipeline stabilizing, pipeline 8 through purging, pressure testing qualified after, at block fort, both sides, riverbank bank with protective conduit 8, river bed adopt original soil backfill, river course is recovered original landforms.Carry out pigging operations after pipeline backfill, river recovery complete, pigging operations comprises and carries out logical ball, purging to pipeline 8, removes the ponding in pipeline 8 and impurity.
Adopt the technological scheme of the present embodiment, what make it possible to accurately to control whole pipeline stabilization sinks in the pipe trench of specifying, make it sit in the right seat, ensure carrying out smoothly of work progress, ensure that rock gas is delivered to owner on time on the one hand, guarantee that owner puts into operation smoothly, on the other hand also for project has saved cost, obtain good economic effect.By analyzing, more cost-saved than general method of construction 150,000 yuan of this method of construction, shifts to an earlier date 10 days than the predetermined duration.Pipeline successfully passes through this river, the up-to-standard rate 100% of construction unit; Welding first-time qualification rate more than 95%; Pressure testing through ball test is success once; Concrete placed under water is disposable qualified.Meanwhile, any pollution and destruction are not caused to local water and soil and natural ecological environment.
Claims (3)
1. the group of pipeline river crossing is to an immersed tube method, it is characterized in that, the steps include:
Step one, pipeline stringing
Pipeline stringing comprises group to, welding, weld seam detection, carries out electrical spark, carrying out flaw detection after weld seam detection, wherein: described group is to comprising pre-group to process and pontoon group to process, specific as follows:
(I), pre-group is to process
Described pipeline (8) is divided into the first pre-group to pipeline (81) and the second pre-group to pipeline (82), this first pre-group comprises the first slope, river section (111), the first elbow section (121) and the first riverbed straight length (131) to pipeline (81), completes the welding successively of the first slope, river section (111), the first elbow section (121), the first riverbed straight length (131) on bank, river; This second pre-group comprises the second slope, river section (112), the second elbow section (122) and the second riverbed straight length (132) to pipeline (82), also the welding successively of the second slope, river section (112), the second elbow section (122), the second riverbed straight length (132) is completed on bank, river, simultaneously, in the upper end on the first slope, river section (111), the first valve (101) is installed, in the upper end on the second slope, river section (112), the second valve (102) is installed;
Complete the first pre-group to pipeline (81) and the second pre-group to after each self assembly of pipeline (82), lineup clamp is used on bank, river, it is right that sideboom tractor carries out pre-group to pipeline (81) and the second pre-group to pipeline (82) to the first pre-group, guarantee that the first elbow section (121) and the second elbow section (122) are in same level, and mark on the end face of the first riverbed straight length (131) and the end face of the second riverbed straight length (132), be specially: on the end face of the first riverbed straight length (131), mark location point A1, B1, C1 and D1, the end face of the second riverbed straight length (132) marks location point A2, B2, C2 and D2, above-mentioned location point A1 is corresponding with location point A2, by that analogy,
(II), pontoon group is to process
After the pre-group of completing steps (I) is to process, first the first pre-group is drawn in river to pipeline (81), one end wherein with the first valve (101) swims on the water surface due to the buoyancy of self, and its other end with labeling position point rests in the pontoon platform (1) in the excavation floating pontoon arrangement on bank; Then dilatory second pre-group is to pipeline (82), one end with labeling position point is also rested in the pontoon platform (1) on bank, make the first riverbed straight length (131) end face marks location point A1, B1, C1, D1 respectively with the second riverbed straight length (132) end face mark location point A2, B2, C2, D2 match; Wherein: described excavation floating pontoon arrangement comprises pontoon platform (1), first hoist (21), second hoist (22) and excavator (4), the first anchor point (51) and the 3rd anchor point (53) is provided with in the side on bank, river, the opposite side on bank, river is provided with the second anchor point (52) and the 4th anchor point (54), above-mentioned the first anchor point (51) is connected by the first guide line (61) with the second anchor point (52), and this first guide line (61) interts in pontoon platform (1); The 3rd above-mentioned anchor point (53) is connected by the second guide line (62) with the 4th anchor point (54), this second guide line (62) also interts in pontoon platform (1), first guide line (61) and the second guide line (62) all parallel with pipe trench (7), and this first guide line (61) and the second guide line (62) are for fixing pontoon platform (1); Pontoon platform (1) is fixed with first hoist (21) and second hoist (22), first hoist (21) is connected with the second anchor point (52) by its wire rope, second hoist (22) is connected with the 4th anchor point (54) by its wire rope, by controlling first hoist (21) and second hoist (22) work, drive pontoon platform (1) on the water surface, moved back and forth pipe canal digging work; Excavator (4) is positioned in pontoon platform (1);
After above-mentioned group completes process, the end face of the end face of the first riverbed straight length (131) and the second riverbed straight length (132) is welded and fixed and carries out weld seam detection, after completing integrated piping (8) welding, by controlling first hoist (21) and second hoist (22) driving pontoon platform (1) motion, the excavator (4) in pontoon platform (1) and the excavator on bank match and are transported on river surface by integrated piping (8);
Step 2, pipeline immersed tube
Carry out pipeline immersed tube after the pipeline stringing of completing steps one in place, its pipeline immersed tube process is specific as follows:
Pipeline (8) is equipped with balancing weight, balancing weight is C30 concrete, the weight of every block balancing weight is 100kg, the Lay interval of adjacent two pieces of balancing weights is 10 meters, in addition, the first elbow section (121) place on pipeline (8) fastens the first buoy (91), the second buoy (92) is fastened at the second elbow section (122) place, (4) one, excavator is respectively established on bank, river two, use the excavator (4) in pontoon platform (1) in the middle of river, utilize three excavators (4) by pipeline (8) handling in river; Simultaneously, the central position of pipe trench (7) is determined and electronic tachometer on frame on the bank in river, the position of the first valve (101), the second valve (102), the first buoy (91), the second buoy (92) is controlled by electronic tachometer, the first valve (101) on pipeline (8) and the second valve (102) are opened, to be poured water in pipeline (8) immersed tube by inlet valve, speed during pipeline (8) immersed tube is wanted evenly, and the first slope, river section (111) and the second slope, river section (112) will balance sinking; In pipeline immersed tube process, during three excavators (4) control immersed tube that utilization arranges, current are to the effect of pipeline (8), the amplitude that adjustment pipeline (8) swings in river, guarantee the first valve (101), the second valve (102), first buoy (91), second buoy (92) remain on the center line of pipe trench (7), if depart from the position of pipe trench (7) in pipeline (8) sinking watching, then adjust in time, guarantee that pipeline (8) entirety sinks in pipe trench (7).
2. the group of a kind of pipeline river crossing according to claim 1 is to immersed tube method, it is characterized in that: the pontoon platform (1) in step one comprises steel pipe and the I-steel of closed at both ends, steel pipe is laid out in parallel, I-steel is fixed by welding and steel pipe two ends, and the steel pipe of laid out in parallel is equipped with plank.
3. the group of a kind of pipeline river crossing according to claim 2 is to immersed tube method, it is characterized in that: the repetition measurement carrying out immersed tube in step 2 after pipeline immersed tube, the repetition measurement process of immersed tube adopts mark post mechanism to carry out, this mark post mechanism comprises steel pipe mark post main body and magnet, described magnet is fixed on the bottom of steel pipe mark post main body, has been gone up the repetition measurement of twin conduit (8) by magnet adsorption at pipeline (8).
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| CN113007440B (en) * | 2021-02-18 | 2022-11-29 | 呼和浩特中燃城市燃气发展有限公司 | Construction method for gas pipeline to pass through river bottom |
| CN113531210B (en) * | 2021-07-06 | 2022-06-21 | 广西华硕建设工程有限公司 | Method for underwater immersed tube construction |
| CN114737609A (en) * | 2022-04-28 | 2022-07-12 | 广东省源天工程有限公司 | Underwater immersed tube construction method |
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