CN112681350A - River cofferdam diversion construction method - Google Patents
River cofferdam diversion construction method Download PDFInfo
- Publication number
- CN112681350A CN112681350A CN202011490463.2A CN202011490463A CN112681350A CN 112681350 A CN112681350 A CN 112681350A CN 202011490463 A CN202011490463 A CN 202011490463A CN 112681350 A CN112681350 A CN 112681350A
- Authority
- CN
- China
- Prior art keywords
- pipeline
- cofferdam
- river
- trench
- diversion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Revetment (AREA)
Abstract
The invention discloses a river cofferdam diversion construction method, which comprises the following steps: determining excavation axes of the diversion trench and the pipeline trench, and excavating the diversion trench on one side of the river along the excavation axes; carrying out cofferdam construction around a construction site, constructing a cofferdam, constructing water retaining dams at the upstream and downstream of a river channel through which a pipeline ditch is excavated, and constructing water retaining dams at two sides of the pipeline ditch; dredging after the cofferdam construction is finished, excavating two drainage ditches at two sides of the river bottom operation zone at the open position after dredging, and arranging a water accumulation pit; excavating the pipeline trench along the excavation axis of the pipeline trench, and pumping and draining the seepage water to a drainage ditch while excavating the pipeline trench; connecting two adjacent sections of prefabricated pipe sections to form a pipeline, and integrally putting the pipeline down to a pipeline ditch and crossing a river channel; and adding a balance weight to the pipeline, backfilling the pipeline ditch, removing the cofferdam and recovering the landform and the landform of the construction section. The method can overcome the defects of geological conditions, effectively avoid landslide and collapse in the pit and improve the construction efficiency of the river channel.
Description
Technical Field
The invention belongs to a construction technology, and particularly relates to a river cofferdam diversion construction method.
Background
The artificial fill layer of the fourth system holonove (Q4m), muddy soil deposited by coastal facies, silty clay layer and silt layer deposited by lake-flushing facies have obvious thixotropy and rheological property, are easy to generate lateral creep, and when the soil of the layer is excavated, if the slope height of the inner side slope of the pipe trench is larger, the inner side slope of the pit is easy to generate.
According to the underground water level and the geological condition, when the pipe trench is excavated to the designed depth, large-area collapse is easy to occur, and the pipe trench is difficult to form; because the ground water level is higher, the surface gathered water is more, the ground bearing capacity is very poor, and the equipment is difficult to walk.
For flood discharge rivers, the water can not be cut off during the construction period of crossing, the working surface along the bank of the river is narrow, and water is accumulated in the river channel all the year round continuously.
Aiming at the addresses and the landforms, the existing excavation construction method cannot meet the construction requirements.
Disclosure of Invention
The invention aims to provide a river channel cofferdam diversion construction method, which can overcome the defects of geological conditions, effectively avoid landslide and collapse in pits and improve the construction efficiency of river channel pipe ditches.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the river cofferdam diversion construction method comprises the following steps:
determining the excavation axes of the diversion trench and the pipeline trench, and releasing the excavation position and the head remaining position of the diversion trench by using a measuring instrument; excavating a diversion channel on one side of the river along an excavation axis, excavating the diversion channel from the middle part to the head retaining positions at two ends, and excavating the diversion channel at the head retaining position of the river channel;
carrying out cofferdam construction around a construction site, constructing a cofferdam, constructing water retaining dams at the upstream and downstream of a river channel through which a pipeline ditch is excavated, and constructing water retaining dams at two sides of the pipeline ditch; laying geotextile on the upstream face of the water retaining dam for retaining water, driving timber piles along two sides of the water retaining dam respectively for reinforcement, and connecting two rows of timber piles by using iron wires;
dredging after the cofferdam construction is finished, excavating two drainage ditches at two sides of the river bottom operation zone at the open position after dredging, arranging a water accumulation pit, guiding accumulated water in the cofferdam into the water accumulation pit, and pumping and discharging the accumulated water out of the cofferdam by a slurry pump;
retesting and setting out the pipeline trench, setting pipeline center line piles and pipeline trench boundary line piles, excavating the pipeline trench along the excavation axis of the pipeline trench to reach a set depth, excavating the pipeline trench by adopting a large slope ratio, excavating in place at one time, and pumping and draining water to a drainage ditch while excavating the pipeline trench;
plugging two ends of the prefabricated pipe section, taking off the plugs at the two ends of the prefabricated pipe section and connecting the two adjacent prefabricated pipe sections to form a pipeline, and after the pipeline ditch is excavated and formed, integrally dropping the pipeline to the pipeline ditch and penetrating through a river channel;
and adding a balance weight to the pipeline, backfilling the pipeline ditch, removing the cofferdam and recovering the landform and the landform of the construction section.
Furthermore, in the process of landform and landform, after the river channel is cleaned, the diversion channel is cut and buried, the landform at the diversion channel is recovered, and river water is led to the river channel again.
Further, in order to prevent the pipeline from being exposed due to later river channel scouring, a cement cover plate is laid on the upper part of the pipeline; after the pipeline trench is excavated, fine sand is paved at the bottom of the trench.
Furthermore, constructing a cofferdam at a place where water exists around the pipeline trench, and covering geotextile on the top of the cofferdam; the bottom of the diversion channel is lower than the river surface water level, and the tops of the cofferdam and the retaining dam are higher than the river surface water level; the retaining dam is located between two junctions of diversion trench and river course.
Further, the retaining dam and the cofferdam are enclosed by sandbags, the width of each layer of sandbag is determined, and the riverbed is leveled at the position of the gunny bag; the steel floating plate is laid on the top of the dam to increase the bearing capacity of the dam.
The invention has the technical effects that:
the method can effectively avoid landslide in the pit and improve the construction efficiency of the river channel. Particularly for places with accumulated water in a river channel, high water level of a construction section and obvious thixotropy and rheological property under geological conditions, the method can overcome the defects of the geological conditions, avoid collapse and obviously improve the construction efficiency.
The invention can also reduce the pollution to the water quality of the river channel and simultaneously protect the surrounding ecological environment.
Drawings
FIG. 1 is a flow chart of a river cofferdam diversion construction method of the invention;
fig. 2 is a schematic view of river diversion excavation according to the present invention.
Detailed Description
The following description sufficiently illustrates specific embodiments of the invention to enable those skilled in the art to practice and reproduce it.
As shown in fig. 1, it is a flow chart of the river cofferdam diversion construction method of the invention;
the river cofferdam diversion construction method specifically comprises the following steps:
step 1: construction preparation;
firstly, according to the approved construction scheme, the occupied area required by the construction site is determined according to the data of site tread lines, design files and the like.
Secondly, organizing and participating constructors to study the drawing contents, making clear the construction process and the construction process, comprehending the construction technical requirements and completing the construction safety, quality and technical completion.
Preparing materials required by construction, determining a material stacking site, determining the approach time of subsequent materials, and ensuring that the construction progress is not influenced by material supply.
And fourthly, equipment required by construction is equipped, maintenance of the equipment is fully carried out, and particularly, careful maintenance is required for the power machinery, so that safe and reliable operation is ensured.
Step 2: measuring and paying off;
before construction, a measurement control point and a construction mark are established, an excavation axis of the diversion trench 1 is determined, a measuring instrument is used for releasing the excavation position and the head retaining position of the diversion trench 1, and meanwhile, an operation zone and a soil piling site are released.
Fig. 2 is a schematic view of river diversion excavation according to the present invention.
And step 3: constructing a diversion channel 1;
firstly, by field measurement, the river beach land planned to dig the diversion trench 1 has sea silt and quicksand, the height difference between the ground and the water surface is 1.5 meters, and the water level of the planned diversion trench 1 is 1 meter lower than that of the river surface. The excavation slope ratio of the diversion trench 1 is 1:0.75, the width of the excavation bottom of the diversion trench 1 is 2 meters, and the depth of the diversion trench 1 is 2.5 meters.
Secondly, excavating a diversion channel 1 on one side of the river, wherein the specific size of the effective width of the diversion channel 1 is determined according to the actual situation of the site during construction, and the trend of the diversion channel 1 is excavated along a route with lower topography according to the terrain. The diversion trench 1 is excavated from the middle part to two ends, and the diversion trench 1 is excavated in the river channel.
And 4, step 4: constructing a cofferdam;
and carrying out cofferdam construction around the construction site, and building a cofferdam and a retaining dam 2.
1. The cofferdam is built at the place where water exists around the pipe trench 3, the top of the cofferdam is covered with geotextile, unsafe accidents such as collapse caused by sunlight exposure weathering, corrosion and damage during construction are prevented, the cofferdam is built by sand bags, and the quality of each sand bag needs to meet the construction requirements.
2. And determining the height and slope rate of the cofferdam and the width of each layer of sandbags according to the hydrogeological conditions of the engineering location.
3. And the measuring personnel controls the plane position and the elevation according to the construction drawing. And inserting marks in the range of the cofferdam by using the steel pipes coated with the obvious marks to determine the position of the cofferdam.
4. When the ground elevation fluctuates too much, the ground elevation is correspondingly adjusted by machinery and manpower so as to improve the water blocking effect of the cofferdam and level the riverbed at the sacks.
5. At the upstream and downstream of the river course department of 3 excavations of pipe ditches process, 15 meters departments apart from the central line of pipe ditches 3 build one retaining dam 2 respectively with sack dress soil, the length of retaining dam 2 is confirmed according to the bank width, at the upstream face of retaining dam 2 the worker's cloth of spreading soil is kept off the water and is in order to avoid the seepage, 2 both sides along the retaining dam are beaten the stake and are consolidated, the diameter 10 centimetres of stake, the interval is 0.5 meters, the stake length is 5 meters, lean out when firmly connecting with the iron wire in order to avoid bearing between two rows of stake, the steel kickboard is spread at the dam crest, increase the bearing capacity of retaining dam 2.
And 5: excavating a drainage ditch and a pipeline ditch 3;
1. after the cofferdam construction is completed, river bottom silt is cleaned by manually matching an excavator, the river bottom silt is placed to one side of an operation area, two drainage ditches of 1m multiplied by 1m are dug at two sides of the river bottom operation area at the open position after the silt is cleaned, a water accumulation pit is arranged according to the actual situation on site, accumulated water which cannot be naturally discharged in the cofferdam is led into the water accumulation pit, and the accumulated water is pumped and discharged out of the cofferdam by a mud pump.
2. And after pumping water between the cofferdams, monitoring and observing the cofferdam body for 24 hours, and after the cofferdam body has no displacement and deformation, starting small-area pipe trench excavation.
3. Before the pipeline ditch 3 is excavated, the position of the pipeline ditch 3 is retested and set out, a pipeline center line pile and a pipeline ditch 3 boundary line pile are arranged, and the line inlet control is carried out on the pipeline center line and the pipeline ditch 3 boundary line at any time.
4. The depth of the duct 3 reaches the design requirement. The pipeline trench 3 is excavated at a large slope ratio, the pipeline trench is excavated in place at one time, and water seepage is pumped and drained while the pipeline trench is excavated.
5. After the pipeline ditch 3 is excavated, fine sand with the thickness of 0.2 m is paved at the bottom of the ditch after the ditch is tested to be qualified by each party, and the next procedure construction is carried out.
6. And (5) assembling and positioning the pipeline.
Considering that the width of the river is relatively small, the total width is 20 meters, and a wide place is selected at the river edge for prefabricating the pipeline, and detection and corrosion prevention are carried out. And the prefabricated pipe section which is prefabricated uses steel plates to plug two ends.
Step 6: the pipeline is arranged in a ditch;
after the pipe trench 3 is excavated and formed, an equipment walking channel is built on the side, and because the width of the river is relatively small, two excavators are adopted to integrally lower the prefabricated pipe section into the trench to pass through the river channel.
And after the prefabricated pipe sections are subjected to groove descending, connecting the lower connecting heads of the two prefabricated pipe sections. According to the actual situation on site, if the underground water level of the river channel is high, the bearing capacity of soil is small, and the collapse sections are more, necessary anti-collapse measures need to be taken when the continuous operation under the ditch is carried out.
And 7: counterweight, pipe ditch backfill, cofferdam demolition and landform restoration.
In order to prevent the gas pipeline from floating upwards in the flood season during later operation, the pipeline is subjected to ballast bag ballast measures, and the distance between the centers of ballast bags is 7 meters for each group. In addition, in order to prevent the pipeline from being exposed due to later river channel erosion, a cement cover plate should be additionally paved on the pipeline along the pipeline, the cement cover plate should be paved after the ballast bag is backfilled for 0.5m, the cover plate specification is 1500mm multiplied by 3000mm multiplied by 200mm, and the soil covering above the cover plate is not less than 0.8 m.
The pipe ditch is backfilled by an excavator, the backfilled soil in the pipe ditch is manually tamped in a layering mode during backfilling, the tamping thickness cannot be larger than 300mm each time, and a single bucket excavator is used for rolling when the pipe ditch is backfilled to the bottom of a river, so that the compactness of the backfilled soil meets the design requirement.
And (3) removing the cofferdam after the pipe trench is backfilled, removing the downstream cofferdam firstly, pouring soil to the edge of the river bank by using a ditcher for the cofferdam, removing the upstream cofferdam finally, removing the upstream cofferdam by adopting a backward moving method by using the ditcher, and restoring the earthwork of the weir body to the original position.
And after the cofferdam is dismantled, building a dam according to the strict standards and design to clean the river bottom. The landform of the ditch, the canal, the riverbed and the bank slope is restored according to the original landform without changing the natural form of the bank slope. The edge of the revetment is smoothly connected with the original river bank, and adverse factors influencing flood discharge objects, water fall, vortex and the like and influencing soil and water conservation are not allowed to appear on the riverbed.
After the river channel is cleaned, the diversion trench is cut and buried, river water is led to the original river channel, and the landform of the diversion trench is restored according to the original landform.
The terminology used herein is for the purpose of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.
Claims (5)
1. A river channel cofferdam diversion construction method comprises the following steps:
determining the excavation axes of the diversion trench and the pipeline trench, and releasing the excavation position and the head remaining position of the diversion trench by using a measuring instrument; excavating a diversion channel on one side of the river along an excavation axis, excavating the diversion channel from the middle part to the head retaining positions at two ends, and excavating the diversion channel at the head retaining position of the river channel;
carrying out cofferdam construction around a construction site, constructing a cofferdam, constructing water retaining dams at the upstream and downstream of a river channel through which a pipeline ditch is excavated, and constructing water retaining dams at two sides of the pipeline ditch; laying geotextile on the upstream face of the water retaining dam for retaining water, driving timber piles along two sides of the water retaining dam respectively for reinforcement, and connecting two rows of timber piles by using iron wires;
dredging after the cofferdam construction is finished, excavating two drainage ditches at two sides of the river bottom operation zone at the open position after dredging, arranging a water accumulation pit, guiding accumulated water in the cofferdam into the water accumulation pit, and pumping and discharging the accumulated water out of the cofferdam by a slurry pump;
retesting and setting out the pipeline trench, setting pipeline center line piles and pipeline trench boundary line piles, excavating the pipeline trench along the excavation axis of the pipeline trench to reach a set depth, excavating the pipeline trench by adopting a large slope ratio, excavating in place at one time, and pumping and draining water to a drainage ditch while excavating the pipeline trench;
plugging two ends of the prefabricated pipe section, taking off the plugs at the two ends of the prefabricated pipe section and connecting the two adjacent prefabricated pipe sections to form a pipeline, and after the pipeline ditch is excavated and formed, integrally dropping the pipeline to the pipeline ditch and penetrating through a river channel;
and adding a balance weight to the pipeline, backfilling the pipeline ditch, removing the cofferdam and recovering the landform and the landform of the construction section.
2. A river cofferdam diversion construction method as claimed in claim 1, wherein in the process of topographic features, after the river is cleaned, the diversion trench is cut and buried, the topography at the diversion trench is restored, and the river is led to the river again.
3. The river course cofferdam diversion construction method of claim 1, wherein in order to prevent the pipeline from being exposed due to the later-stage river course scouring, a cement cover plate is laid on the upper part of the pipeline; after the pipeline trench is excavated, fine sand is paved at the bottom of the trench.
4. The river cofferdam diversion construction method of claim 1, wherein a cofferdam is constructed at a place where water exists around the pipe trench, and geotextile is added on the top of the cofferdam; the bottom of the diversion channel is lower than the river surface water level, and the tops of the cofferdam and the retaining dam are higher than the river surface water level; the retaining dam is located between two junctions of diversion trench and river course.
5. The river cofferdam diversion construction method of claim 1, wherein the retaining dam and the cofferdam are enclosed with sandbags, the width of each layer of sandbag is determined, and the riverbed is leveled to the sack position; the steel floating plate is laid on the top of the dam to increase the bearing capacity of the dam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011490463.2A CN112681350A (en) | 2020-12-16 | 2020-12-16 | River cofferdam diversion construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011490463.2A CN112681350A (en) | 2020-12-16 | 2020-12-16 | River cofferdam diversion construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112681350A true CN112681350A (en) | 2021-04-20 |
Family
ID=75448441
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011490463.2A Pending CN112681350A (en) | 2020-12-16 | 2020-12-16 | River cofferdam diversion construction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112681350A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113106993A (en) * | 2021-05-13 | 2021-07-13 | 中建一局集团第一建筑有限公司 | Underground space excavation closure flow guide structure containing inland river channel |
| CN113250266A (en) * | 2021-06-18 | 2021-08-13 | 中铁四局集团有限公司 | Dry-type dredging method for river channel |
| CN113585164A (en) * | 2021-08-31 | 2021-11-02 | 中煤科工集团北京土地整治与生态修复科技研究院有限公司 | River diversion method based on underground coal mining engineering of coal mining working face |
| CN114150612A (en) * | 2021-11-17 | 2022-03-08 | 中交水利水电建设有限公司 | Construction method suitable for digging small river channel |
| CN114703770A (en) * | 2022-04-15 | 2022-07-05 | 中铁三局集团广东建设工程有限公司 | Box culvert construction process |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04254606A (en) * | 1991-02-07 | 1992-09-09 | Fujita Corp | Construction of double closing levee |
| CN103775735A (en) * | 2012-10-25 | 2014-05-07 | 陕西龙海工程建设有限公司 | Construction method for pipeline crossing river |
| CN103912722A (en) * | 2014-04-23 | 2014-07-09 | 中国化学工程第三建设有限公司 | Sunken pipe assembling method for making pipeline pass through river |
| CN204356792U (en) * | 2014-12-26 | 2015-05-27 | 长安大学 | The construction equipment of cofferdam, a kind of river water conservancy diversion |
-
2020
- 2020-12-16 CN CN202011490463.2A patent/CN112681350A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04254606A (en) * | 1991-02-07 | 1992-09-09 | Fujita Corp | Construction of double closing levee |
| CN103775735A (en) * | 2012-10-25 | 2014-05-07 | 陕西龙海工程建设有限公司 | Construction method for pipeline crossing river |
| CN103912722A (en) * | 2014-04-23 | 2014-07-09 | 中国化学工程第三建设有限公司 | Sunken pipe assembling method for making pipeline pass through river |
| CN204356792U (en) * | 2014-12-26 | 2015-05-27 | 长安大学 | The construction equipment of cofferdam, a kind of river water conservancy diversion |
Non-Patent Citations (1)
| Title |
|---|
| ZZQYYF: "河流穿越施工方案（围堰导流法）", 《豆丁建筑》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113106993A (en) * | 2021-05-13 | 2021-07-13 | 中建一局集团第一建筑有限公司 | Underground space excavation closure flow guide structure containing inland river channel |
| CN113250266A (en) * | 2021-06-18 | 2021-08-13 | 中铁四局集团有限公司 | Dry-type dredging method for river channel |
| CN113585164A (en) * | 2021-08-31 | 2021-11-02 | 中煤科工集团北京土地整治与生态修复科技研究院有限公司 | River diversion method based on underground coal mining engineering of coal mining working face |
| CN114150612A (en) * | 2021-11-17 | 2022-03-08 | 中交水利水电建设有限公司 | Construction method suitable for digging small river channel |
| CN114703770A (en) * | 2022-04-15 | 2022-07-05 | 中铁三局集团广东建设工程有限公司 | Box culvert construction process |
| CN114703770B (en) * | 2022-04-15 | 2023-08-04 | 中铁三局集团广东建设工程有限公司 | Box culvert construction process |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112681350A (en) | River cofferdam diversion construction method | |
| CN106801424B (en) | A kind of cofferdam construction method | |
| CN110306616A (en) | A kind of construction method of sewage conduct | |
| WO2021232416A1 (en) | Water intake pipeline structure passing through soft-foundation embankment below flood level, and construction method | |
| CN110656621A (en) | River channel closure system structure and construction method | |
| CN113006108B (en) | Construction method of film bag sand cofferdam | |
| CN111455737A (en) | Wading railway roadbed structure and construction method thereof | |
| CN112663558B (en) | Construction process for excavating weathered rock in inland river harbor pool | |
| CN109235474B (en) | Structure of super-large cofferdam based on marine environment and construction process thereof | |
| CN114482096A (en) | Steel sheet pile-cofferdam water retaining system suitable for inland river harbor basin and construction method thereof | |
| CN111851546A (en) | Construction method for sealing precipitation of drainage well in deep foundation pit construction | |
| CN212316981U (en) | Water intake pipeline structure penetrating through soft foundation dike below flood level | |
| CN216275788U (en) | Drainage device used after failure of water interception curtain of deep foundation pit | |
| CN115419091A (en) | Bearing platform island-building cofferdam structure under rapid-flow and large-amplitude water level environment and construction method | |
| CN112253848B (en) | Sand geology water network swamp area pipeline construction method | |
| CN115341561A (en) | Water area cofferdam construction method | |
| CN114075805A (en) | Construction method for foundation earthwork of trestle | |
| CN114775620B (en) | Construction method for progressive excavation of plain riverbank under mucky soil condition | |
| CN218204449U (en) | Structure for river-crossing pipe burying engineering | |
| CN111501681B (en) | TRD construction method continuous wall and earth-rock cofferdam combined composite temporary water retaining structure and construction method | |
| CN217460445U (en) | Novel refute bank suitable for soft soil foundation | |
| CN212506339U (en) | Long double larsen steel sheet pile stone-filling slag cofferdam | |
| CN217710783U (en) | Occupy full section cofferdam of river course structure and break stream structure not | |
| CN112900364B (en) | Anti-scouring and anti-sliding structure of diversion tunnel outlet opposite-bank road side slope and construction method thereof | |
| CN213038406U (en) | TRD construction method diaphragm wall and earth-rock cofferdam combined composite temporary water retaining structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210420 |
|
| RJ01 | Rejection of invention patent application after publication |