CN113668613A - Application of GRP sewage well in ultra-deep sewage pipeline system - Google Patents
Application of GRP sewage well in ultra-deep sewage pipeline system Download PDFInfo
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- CN113668613A CN113668613A CN202110993077.3A CN202110993077A CN113668613A CN 113668613 A CN113668613 A CN 113668613A CN 202110993077 A CN202110993077 A CN 202110993077A CN 113668613 A CN113668613 A CN 113668613A
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- 239000010865 sewage Substances 0.000 title claims abstract description 21
- 238000012360 testing method Methods 0.000 claims abstract description 80
- 238000010276 construction Methods 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 238000009434 installation Methods 0.000 claims abstract description 20
- 238000009412 basement excavation Methods 0.000 claims description 15
- 238000007689 inspection Methods 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 15
- 238000001556 precipitation Methods 0.000 claims description 15
- 230000015572 biosynthetic process Effects 0.000 claims description 9
- 239000004744 fabric Substances 0.000 claims description 9
- 239000004677 Nylon Substances 0.000 claims description 6
- 239000004698 Polyethylene Substances 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 6
- 238000005056 compaction Methods 0.000 claims description 6
- 238000012790 confirmation Methods 0.000 claims description 6
- 239000003651 drinking water Substances 0.000 claims description 6
- 210000001503 joint Anatomy 0.000 claims description 6
- 229920001778 nylon Polymers 0.000 claims description 6
- -1 polyethylene Polymers 0.000 claims description 6
- 229920000573 polyethylene Polymers 0.000 claims description 6
- 238000000275 quality assurance Methods 0.000 claims description 6
- 238000003908 quality control method Methods 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 230000004888 barrier function Effects 0.000 claims description 3
- 235000012206 bottled water Nutrition 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 230000002950 deficient Effects 0.000 claims description 3
- 235000020188 drinking water Nutrition 0.000 claims description 3
- 239000004746 geotextile Substances 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 230000007774 longterm Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 238000010926 purge Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 230000008439 repair process Effects 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 229920011532 unplasticized polyvinyl chloride Polymers 0.000 claims description 3
- 238000011179 visual inspection Methods 0.000 claims description 3
- 238000004078 waterproofing Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 abstract description 5
- 238000000576 coating method Methods 0.000 abstract description 5
- 238000002360 preparation method Methods 0.000 abstract 1
- 230000002706 hydrostatic effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/18—Making embankments, e.g. dikes, dams
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Sewage (AREA)
Abstract
The invention discloses an application of a GRP sewage well in an ultra-deep sewage pipeline system, which comprises the steps of work preparation, pipeline installation, GRP well installation, a water closing test, a deflection ball passing test and the like. The invention reduces the secondary coating of GRP anticorrosive coating on the outer side of the concrete well, is prefabricated in a factory, saves the construction period, is convenient to install, can ensure the quality, and reduces the leakage of a sewage system through technical and technological innovation.
Description
Technical Field
The invention relates to an application of a GRP sewage well in an ultra-deep sewage pipeline system.
Background
In ultra-deep sewer line systems. How to reduce the problem that the concrete well is secondarily coated with a GRP anticorrosive coating on the outer side and reduce the leakage of a sewage system is a problem which needs to be solved for a long time in the field, and the problems can not be effectively solved by the existing construction technology. .
Disclosure of Invention
The invention aims to provide the application of the GRP sewage well in the ultra-deep sewage pipeline system, which saves the construction period, is convenient to install and reduces the leakage of a sewage system.
The technical solution of the invention is as follows:
the application of the GRP sewage well in the ultra-deep sewage pipeline system is characterized in that: comprises the following steps:
preparing for work:
the method comprises the following steps: preparing a pipeline; couplers and fittings to be installed on defective items, inspected by engineers, and then installed on trenches and replacement items, ensuring that the associated recipe statements are approved; submitting the RFI for pipeline laying; ensuring that traffic management is in place as required; submitting and approving a construction drawing of a specific project; confirmation of ILS of pipe/MHS; from prior to approved construction drawings/detailed design, the pipeline is installed with the pre-excavation precipitation system in place;
ensuring that the pipes and fittings are tested at the factory in compliance with ADSSC specifications and approved material submissions; ensure that the pipes and fittings are safe and reliable during transport, provide adequate support along their length and should be covered during transport; ensuring that the pipe and fittings are lifted using nylon or large diameter rope slings, the slings should be placed in the center and two per quarter of the pipe length from each side; the storage area must be covered with a sun cloth; the pipeline and the fittings are covered under the opaque sunshade cloth, and the sunshade cloth is not directly irradiated by sunlight at any time and keeps the air around the pipeline to freely flow; the rubber joint ring is stored in a well ventilated place and is not irradiated by sunlight; ensuring that each submitted QA/QC report is attached, and ensuring that the material is inspected and approved by a consultant, ensuring that the height of the stacked pipes does not exceed 2 m;
(II) pipeline installation
During transport from storage to construction, ensuring that the pipe and fittings are lifted using nylon or large diameter rope slings, one quarter of the pipe length should be placed from each side for lifting; the pipeline cutting uses special tools, and the installation, laying and connection of pipelines and fittings along a planned ditch bed and to lines and elevations are carried out by a machine; the laying of the pipeline is carried out from downstream to upstream; the ends of the pipes should be protected from any foreign material; before laying the pipeline, arranging geotextile in the groove, covering the pipeline with broken stone to cover the thickness of not less than 300mm, and once the pipeline is laid from the manhole to the manhole, checking whether the pipeline is aligned and elevated by an engineer; after approval, the bottom bed and top mat are compacted prior to backfilling, and after backfilling the trench, the layers should be layered with the selected materials and compacted as specified. Concrete is required to be wrapped and protected for the pipelines which are not deeply buried or pass through the pipelines, and the required concrete periphery is poured according to the size shown in a standard drawing, namely the specified outer diameter thickness; after concrete pouring, immediately covering and curing the surface for at least one day by using a polyethylene sheet;
the pipes should be tested as follows: a water closing test and a deflection ball test; quality assurance/quality control checks should ensure compliance with quality assurance/quality control procedures and specifications, and the mesh/warning tape should be used for safe and correct working procedures;
continuing excavating to a stratum elevation according to the approved construction drawing, and performing pipe well construction; the construction site will be kept clean all the time and continuously supervised; setting a safety barrier for foundation pit excavation according to a safety manual, rules and approved safety plans; after the foundation pit excavation reaches the stratum report, slowly excavating to a pipe bottom report according to an approved construction drawing; protecting the excavation side to avoid collapse; the formation level should be manually leveled and compacted with a compactor, as approved by engineers, to ensure a sufficiently firm formation;
if precipitation is required according to standard and approved protocols, formation compaction tests should be performed and the required compaction must be passed with an MDD of at least 95%; before pouring concrete, submitting WIR in advance, and checking elevation and coordination;
GRP well installation
(1) Concrete for foundation mat
The excavated foundation pit is leveled and compacted to a designed elevation; placing 1000G polyethylene plates before pouring so as to pour C20-grade concrete with the specified thickness of 100 mm; curing is carried out according to the regulations; if the excavation exceeds the elevation required by the design, filling the concrete with C20 grade concrete; the size of the template is required to be used for manufacturing a manhole base installation larger than 150mm according to an approved construction drawing; the waterproofing membrane should be installed according to the materials and methods of use approved by approved suppliers; leveling concrete is adopted for waterproof protection; the WIR acceptance needs to be submitted in advance before the manhole base is installed; filling the concrete in the base with C40;
(2) installing GRP manhole well
Checking and accepting the GRP well, closing the pouring hole, moving the GRP manhole out of the warehouse area by using a mobile crane, fixing chain slings on 4 lifting hooks, and loading a truck; the GRP well is the MH main well and will be installed at the final confirmation location according to the approved construction drawings; before the manhole is installed, please put forward inspection requirements to engineers in advance; after the MH main well is installed, the bobbin is lifted, and the centering direction is checked; repairing the background and pouring concrete around the background; filling the manhole layer by layer according to standard requirements, wherein the layering does not exceed 250mm, and each layer is tested for FDT 95%; the tests required for GRP (hydrostatic and deflection) should be performed as per standard requirements and approved by engineers for separate method statements; after the GRP manhole is installed, an engineer checks and measures the elevation, and then the upstream port and the downstream port of the manhole are connected; the pipe between the two manholes is tested and inspected according to an approved protocol, before laying the underlayment and the surround, and inspected by an engineer; before the manhole is installed, WIR inspection elevation and positioning are required to be submitted;
(IV) Water shut-off test
After the supervision approval is obtained, performing a water-closing test; water shut-off tests and pipeline cleaning with potable water, using appropriately designed fittings to temporarily close the opening in the pipeline for testing; sufficiently supported using a fitting to withstand a specified pressure; ensuring that the arrangement of the test pipes includes provisions for purging air from the pipes prior to the water test; in the case of multiple pipelines, either common or trench-laid, testing only one pipeline at any one time ensures availability and operational status of all test equipment; pressure gauges for testing pipes, the accuracy of which should be checked in a separate laboratory, providing engineers with detailed accuracy certificates, precipitation should be stopped at least 3 days before testing, all points must be checked before testing to avoid failures and to ensure that the trench keeps the dry line to be slowly and uniformly filled with drinking water, from lowest end point to highest point; installing a vent to release the entrapped air, leaving the test portion for stable observation after filling the pipeline with water; the filling rate of the waterline should be controlled to ensure proper and flow rate kept below the allowable limit for testing all non-pressurized pipes, after concrete or granular wrapping is completed, until the sewage system of the pipe is completed, cleaning the objects around the pipe joints, allowing visual inspection of leakage using a water head test for any depth inversion plus 1.0m or 5.0m, whichever is greater; the end socket at the lower end of the measuring pipeline keeps a water head for 30 minutes, and water is added from the measuring container every 10 minutes if necessary; recording the water addition of the measuring container, which is evaluated to pass the formula of the test; if any leaks or damage is found during the inspection, the pipe or joint must not be accepted; the length of the test pipe between manholes or the shorter length precipitation that an engineer may allow will stop 3 days before the test; saving all test records and providing for inspection; the process should be repeated until the specification requirements are met;
(V) deflection ball test
After a UPVC pipeline is installed, a water closing test and groove backfilling are carried out, but before precipitation is removed, a ball is pulled through the pipeline as soon as possible, so that the size of the ball cannot pass through any point in the pipeline, and the point is allowed to be larger than the point allowed after the initial installation; immediately before issuing the provisional acceptance certificate, passing the ball through the conduit so that it does not pass through any point in the conduit which is deflected to a greater extent than is permitted for a longer period of time, the conduit being replaced if any of these tests indicate that the deflection may exceed the permitted value;
detaching any pipeline which cannot be subjected to deflection inspection from the site, wherein all replaced pipelines are deflected; carrying out deflection test on 20m adjacent pipelines at two sides of the removed pipeline; the positive and negative deflections on the pipe must not exceed the following values: a 3m, 5% long term diameter reduction after initial installation should be considered as negative deflection.
In the middle of the work progress, some local change or deviation often can appear, especially in the well height, as long as it is more convenient to repair at certain increase height within range, utilizes finished product GRP pipe, directly with GRP glass steel glue butt joint increase, if the part that the superelevation appears also can directly cut off.
The invention reduces the secondary coating of GRP anticorrosive coating on the outer side of the concrete well, is prefabricated in a factory, saves the construction period, is convenient to install, can ensure the quality, and reduces the leakage of a sewage system through technical and technological innovation. Is particularly suitable for middle east.
The present invention will be further described with reference to the following examples.
Detailed Description
Use of a GRP bilge well in an ultra-deep bilge pipeline system, comprising the steps of:
preparing for work:
the method comprises the following steps: preparing a pipeline; couplers and fittings to be installed on defective items, inspected by engineers, and then installed on trenches and replacement items, ensuring that the associated recipe statements are approved; submitting the RFI for pipeline laying; ensuring that traffic management is in place as required; submitting and approving a construction drawing of a specific project; confirmation of ILS of pipe/MHS; from prior to approved construction drawings/detailed design, the pipeline is installed with the pre-excavation precipitation system in place;
ensuring that the pipes and fittings are tested at the factory in compliance with ADSSC specifications and approved material submissions; ensure that the pipes and fittings are safe and reliable during transport, provide adequate support along their length and should be covered during transport; ensuring that the pipe and fittings are lifted using nylon or large diameter rope slings, the slings should be placed in the center and two per quarter of the pipe length from each side; the storage area must be covered with a sun cloth; the pipeline and the fittings are covered under the opaque sunshade cloth, and the sunshade cloth is not directly irradiated by sunlight at any time and keeps the air around the pipeline to freely flow; the rubber joint ring is stored in a well ventilated place and is not irradiated by sunlight; ensuring that each submitted QA/QC report is attached, and ensuring that the material is inspected and approved by a consultant, ensuring that the height of the stacked pipes does not exceed 2 m;
(II) pipeline installation
During transport from storage to construction, ensuring that the pipe and fittings are lifted using nylon or large diameter rope slings, one quarter of the pipe length should be placed from each side for lifting; the pipeline cutting uses special tools, and the installation, laying and connection of pipelines and fittings along a planned ditch bed and to lines and elevations are carried out by a machine; the laying of the pipeline is carried out from downstream to upstream; the ends of the pipes should be protected from any foreign material; before laying the pipeline, arranging geotextile in the groove, covering the pipeline with broken stone to cover the thickness of not less than 300mm, and once the pipeline is laid from the manhole to the manhole, checking whether the pipeline is aligned and elevated by an engineer; after approval, the bottom bed and top mat are compacted prior to backfilling, and after backfilling the trench, the layers should be layered with the selected materials and compacted as specified. Concrete is required to be wrapped and protected for the pipelines which are not deeply buried or pass through the pipelines, and the required concrete periphery is poured according to the size shown in a standard drawing, namely the specified outer diameter thickness; after concrete pouring, immediately covering and curing the surface for at least one day by using a polyethylene sheet;
the pipes should be tested as follows: a water closing test and a deflection ball test; quality assurance/quality control checks should ensure compliance with quality assurance/quality control procedures and specifications, and the mesh/warning tape should be used for safe and correct working procedures;
continuing excavating to a stratum elevation according to the approved construction drawing, and performing pipe well construction; the construction site will be kept clean all the time and continuously supervised; setting a safety barrier for foundation pit excavation according to a safety manual, rules and approved safety plans; after the foundation pit excavation reaches the stratum report, slowly excavating to a pipe bottom report according to an approved construction drawing; protecting the excavation side to avoid collapse; the formation level should be manually leveled and compacted with a compactor, as approved by engineers, to ensure a sufficiently firm formation;
if precipitation is required according to standard and approved protocols, formation compaction tests should be performed and the required compaction must be passed with an MDD of at least 95%; before pouring concrete, submitting WIR in advance, and checking elevation and coordination;
GRP well installation
(1) Concrete for foundation mat
The excavated foundation pit is leveled and compacted to a designed elevation; placing 1000G polyethylene plates before pouring so as to pour C20-grade concrete with the specified thickness of 100 mm; curing is carried out according to the regulations; if the excavation exceeds the elevation required by the design, filling the concrete with C20 grade concrete; the size of the template is required to be used for manufacturing a manhole base installation larger than 150mm according to an approved construction drawing; the waterproofing membrane should be installed according to the materials and methods of use approved by approved suppliers; leveling concrete is adopted for waterproof protection; the WIR acceptance needs to be submitted in advance before the manhole base is installed; filling the concrete in the base with C40;
(2) installing GRP manhole well
Checking and accepting the GRP well, closing the pouring hole, moving the GRP manhole out of the warehouse area by using a mobile crane, fixing chain slings on 4 lifting hooks, and loading a truck; the GRP well is the MH main well and will be installed at the final confirmation location according to the approved construction drawings; before the manhole is installed, please put forward inspection requirements to engineers in advance; after the MH main well is installed, the bobbin is lifted, and the centering direction is checked; repairing the background and pouring concrete around the background; filling the manhole layer by layer according to standard requirements, wherein the layering does not exceed 250mm, and each layer is tested for FDT 95%; the tests required for GRP (hydrostatic and deflection) should be performed as per standard requirements and approved by engineers for separate method statements; after the GRP manhole is installed, an engineer checks and measures the elevation, and then the upstream port and the downstream port of the manhole are connected; the pipe between the two manholes is tested and inspected according to an approved protocol, before laying the underlayment and the surround, and inspected by an engineer; before the manhole is installed, WIR inspection elevation and positioning are required to be submitted;
(IV) Water shut-off test
After the supervision approval is obtained, performing a water-closing test; water shut-off tests and pipeline cleaning with potable water, using appropriately designed fittings to temporarily close the opening in the pipeline for testing; sufficiently supported using a fitting to withstand a specified pressure; ensuring that the arrangement of the test pipes includes provisions for purging air from the pipes prior to the water test; in the case of multiple pipelines, either common or trench-laid, testing only one pipeline at any one time ensures availability and operational status of all test equipment; pressure gauges for testing pipes, the accuracy of which should be checked in a separate laboratory, providing engineers with detailed accuracy certificates, precipitation should be stopped at least 3 days before testing, all points must be checked before testing to avoid failures and to ensure that the trench keeps the dry line to be slowly and uniformly filled with drinking water, from lowest end point to highest point; installing a vent to release the entrapped air, leaving the test portion for stable observation after filling the pipeline with water; the filling rate of the waterline should be controlled to ensure proper and flow rate kept below the allowable limit for testing all non-pressurized pipes, after concrete or granular wrapping is completed, until the sewage system of the pipe is completed, cleaning the objects around the pipe joints, allowing visual inspection of leakage using a water head test for any depth inversion plus 1.0m or 5.0m, whichever is greater; the end socket at the lower end of the measuring pipeline keeps a water head for 30 minutes, and water is added from the measuring container every 10 minutes if necessary; recording the water addition of the measuring container, which is evaluated to pass the formula of the test; if any leaks or damage is found during the inspection, the pipe or joint must not be accepted; the length of the test pipe between manholes or the shorter length precipitation that an engineer may allow will stop 3 days before the test; saving all test records and providing for inspection; the process should be repeated until the specification requirements are met;
(V) deflection ball test
After a UPVC pipeline is installed, a water closing test and groove backfilling are carried out, but before precipitation is removed, a ball is pulled through the pipeline as soon as possible, so that the size of the ball cannot pass through any point in the pipeline, and the point is allowed to be larger than the point allowed after the initial installation; immediately before issuing the provisional acceptance certificate, passing the ball through the conduit so that it does not pass through any point in the conduit which is deflected to a greater extent than is permitted for a longer period of time, the conduit being replaced if any of these tests indicate that the deflection may exceed the permitted value;
detaching any pipeline which cannot be subjected to deflection inspection from the site, wherein all replaced pipelines are deflected; carrying out deflection test on 20m adjacent pipelines at two sides of the removed pipeline; the positive and negative deflections on the pipe must not exceed the following values: a 3m, 5% long term diameter reduction after initial installation should be considered as negative deflection.
In the middle of the work progress, some local change or deviation often can appear, especially in the well height, as long as it is more convenient to repair at certain increase height within range, utilizes finished product GRP pipe, directly with GRP glass steel glue butt joint increase, if the part that the superelevation appears also can directly cut off.
Claims (2)
1. The application of the GRP sewage well in the ultra-deep sewage pipeline system is characterized in that: comprises the following steps:
preparing for work:
the method comprises the following steps: preparing a pipeline; couplers and fittings to be installed on defective items, inspected by engineers, and then installed on trenches and replacement items, ensuring that the associated recipe statements are approved; submitting the RFI for pipeline laying; ensuring that traffic management is in place as required; submitting and approving a construction drawing of a specific project; confirmation of ILS of pipe/MHS; from prior to approved construction drawings/detailed design, the pipeline is installed with the pre-excavation precipitation system in place;
ensuring that the pipes and fittings are tested at the factory in compliance with ADSSC specifications and approved material submissions; ensure that the pipes and fittings are safe and reliable during transport, provide adequate support along their length and should be covered during transport; ensuring that the pipe and fittings are lifted using nylon or large diameter rope slings, the slings should be placed in the center and two per quarter of the pipe length from each side; the storage area must be covered with a sun cloth; the pipeline and the fittings are covered under the opaque sunshade cloth, and the sunshade cloth is not directly irradiated by sunlight at any time and keeps the air around the pipeline to freely flow; the rubber joint ring is stored in a well ventilated place and is not irradiated by sunlight; ensuring that each submitted QA/QC report is attached, and ensuring that the material is inspected and approved by a consultant, ensuring that the height of the stacked pipes does not exceed 2 m;
(II) pipeline installation
During transport from storage to construction, ensuring that the pipe and fittings are lifted using nylon or large diameter rope slings, one quarter of the pipe length should be placed from each side for lifting; the pipeline cutting uses special tools, and the installation, laying and connection of pipelines and fittings along a planned ditch bed and to lines and elevations are carried out by a machine; the laying of the pipeline is carried out from downstream to upstream; the ends of the pipes should be protected from any foreign material; before laying the pipeline, arranging geotextile in the groove, covering the pipeline with broken stone to cover the thickness of not less than 300mm, and once the pipeline is laid from the manhole to the manhole, checking whether the pipeline is aligned and elevated by an engineer; after approval, the bottom bed and top mat are compacted prior to backfilling, and after backfilling the trench, the layers should be layered with the selected materials and compacted as specified. Concrete is required to be wrapped and protected for the pipelines which are not deeply buried or pass through the pipelines, and the required concrete periphery is poured according to the size shown in a standard drawing, namely the specified outer diameter thickness; after concrete pouring, immediately covering and curing the surface for at least one day by using a polyethylene sheet;
the pipes should be tested as follows: a water closing test and a deflection ball test; quality assurance/quality control checks should ensure compliance with quality assurance/quality control procedures and specifications, and the mesh/warning tape should be used for safe and correct working procedures;
continuing excavating to a stratum elevation according to the approved construction drawing, and performing pipe well construction; the construction site will be kept clean all the time and continuously supervised; setting a safety barrier for foundation pit excavation according to a safety manual, rules and approved safety plans; after the foundation pit excavation reaches the stratum report, slowly excavating to a pipe bottom report according to an approved construction drawing; protecting the excavation side to avoid collapse; the formation level should be manually leveled and compacted with a compactor, as approved by engineers, to ensure a sufficiently firm formation;
if precipitation is required according to standard and approved protocols, formation compaction tests should be performed and the required compaction must be passed with an MDD of at least 95%; before pouring concrete, submitting WIR in advance, and checking elevation and coordination;
GRP well installation
(1) Concrete for foundation mat
The excavated foundation pit is leveled and compacted to a designed elevation; placing 1000G polyethylene plates before pouring so as to pour C20-grade concrete with the specified thickness of 100 mm; curing is carried out according to the regulations; if the excavation exceeds the elevation required by the design, filling the concrete with C20 grade concrete; the size of the template is required to be used for manufacturing a manhole base installation larger than 150mm according to an approved construction drawing; the waterproofing membrane should be installed according to the materials and methods of use approved by approved suppliers; leveling concrete is adopted for waterproof protection; the WIR acceptance needs to be submitted in advance before the manhole base is installed; filling the concrete in the base with C40;
(2) installing GRP manhole well
Checking and accepting the GRP well, closing the pouring hole, moving the GRP manhole out of the warehouse area by using a mobile crane, fixing chain slings on 4 lifting hooks, and loading a truck; the GRP well is the MH main well and will be installed at the final confirmation location according to the approved construction drawings; before the manhole is installed, please put forward inspection requirements to engineers in advance; after the MH main well is installed, the bobbin is lifted, and the centering direction is checked; repairing the background and pouring concrete around the background; filling the manhole layer by layer according to standard requirements, wherein the layering does not exceed 250mm, and each layer is tested for FDT 95%; the testing of the GRP requirements should be performed as per the standard requirements and the individual method statements approved by the engineer; after the GRP manhole is installed, an engineer checks and measures the elevation, and then the upstream port and the downstream port of the manhole are connected; the pipe between the two manholes is tested and inspected according to an approved protocol, before laying the underlayment and the surround, and inspected by an engineer; before the manhole is installed, WIR inspection elevation and positioning are required to be submitted;
(IV) Water shut-off test
After the supervision approval is obtained, performing a water-closing test; water shut-off tests and pipeline cleaning with potable water, using appropriately designed fittings to temporarily close the opening in the pipeline for testing; sufficiently supported using a fitting to withstand a specified pressure; ensuring that the arrangement of the test pipes includes provisions for purging air from the pipes prior to the water test; in the case of multiple pipelines, either common or trench-laid, testing only one pipeline at any one time ensures availability and operational status of all test equipment; pressure gauges for testing pipes, the accuracy of which should be checked in a separate laboratory, providing engineers with detailed accuracy certificates, precipitation should be stopped at least 3 days before testing, all points must be checked before testing to avoid failures and to ensure that the trench keeps the dry line to be slowly and uniformly filled with drinking water, from lowest end point to highest point; installing a vent to release the entrapped air, leaving the test portion for stable observation after filling the pipeline with water; the filling rate of the waterline should be controlled to ensure proper and flow rate kept below the allowable limit for testing all non-pressurized pipes, after concrete or granular wrapping is completed, until the sewage system of the pipe is completed, cleaning the objects around the pipe joints, allowing visual inspection of leakage using a water head test for any depth inversion plus 1.0m or 5.0m, whichever is greater; the end socket at the lower end of the measuring pipeline keeps a water head for 30 minutes, and water is added from the measuring container every 10 minutes if necessary; recording the water addition of the measuring container, which is evaluated to pass the formula of the test; if any leaks or damage is found during the inspection, the pipe or joint must not be accepted; the length of the test pipe between manholes or the shorter length precipitation that an engineer may allow will stop 3 days before the test; saving all test records and providing for inspection; the process should be repeated until the specification requirements are met;
(V) deflection ball test
After a UPVC pipeline is installed, a water closing test and groove backfilling are carried out, but before precipitation is removed, a ball is pulled through the pipeline as soon as possible, so that the size of the ball cannot pass through any point in the pipeline, and the point is allowed to be larger than the point allowed after the initial installation; immediately before issuing the provisional acceptance certificate, passing the ball through the conduit so that it does not pass through any point in the conduit which is deflected to a greater extent than is permitted for a longer period of time, the conduit being replaced if any of these tests indicate that the deflection may exceed the permitted value;
detaching any pipeline which cannot be subjected to deflection inspection from the site, wherein all replaced pipelines are deflected; carrying out deflection test on 20m adjacent pipelines at two sides of the removed pipeline; the positive and negative deflections on the pipe must not exceed the following values: a 3m, 5% long term diameter reduction after initial installation should be considered as negative deflection.
2. The use of a GRP bilge well in an ultra-deep bilge pipeline system according to claim 1, wherein: in the middle of the work progress, some local change or deviation often can appear, especially in the well height, as long as it is more convenient to repair at certain increase height within range, utilizes finished product GRP pipe, directly with GRP glass steel glue butt joint increase, if the part that the superelevation appears also can directly cut off.
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