CN108487310B - Geomembrane isolation process for reducing horizontal clear distance between pipeline and building and pipeline - Google Patents
Geomembrane isolation process for reducing horizontal clear distance between pipeline and building and pipeline Download PDFInfo
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- CN108487310B CN108487310B CN201810213320.3A CN201810213320A CN108487310B CN 108487310 B CN108487310 B CN 108487310B CN 201810213320 A CN201810213320 A CN 201810213320A CN 108487310 B CN108487310 B CN 108487310B
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- 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
- E02D29/10—Tunnels or galleries specially adapted to house conduits, e.g. oil pipe-lines, sewer pipes ; Making conduits in situ, e.g. of concrete ; Casings, i.e. manhole shafts, access or inspection chambers or coverings of boreholes or narrow wells
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0085—Geotextiles
- E02D2300/0089—Geotextiles non-woven
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2450/00—Gaskets
- E02D2450/10—Membranes
- E02D2450/105—Membranes impermeable
- E02D2450/106—Membranes impermeable for liquids
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Abstract
The invention relates to a geomembrane isolation construction process for reducing the requirement of horizontal clear distance between a pipeline and a building, which comprises the following steps: excavating a base surface, laying a geomembrane on the base surface, isolating a building from the position of a water or gas pipeline to be laid and the position of the water or gas pipeline to be laid from other laid pipelines by the geomembrane, backfilling soil after the geomembrane is laid to form a groove for laying the pipeline, backfilling, compacting and laying a road base layer and a road surface layer.
Description
Technical Field
The invention relates to the technical field of municipal pipeline construction processes, in particular to a geomembrane isolation process for reducing horizontal clear distance between a pipeline and a building and between pipelines.
Background
Most municipal pipelines in cities are buried underground, and the reasonable arrangement of the pipelines is an important guarantee for life lines in cities. Along with the development of social economy and the improvement of the living standard of people, municipal pipelines under urban roads are increasingly complex, especially for historical culture famous city protection areas, the width of the roads in the areas is small, the types of the pipelines to be laid are various, and the horizontal clear distance between the pipelines and buildings and the pipelines cannot be guaranteed. When the distance between pipelines is difficult to meet the 4.1.9 item of integrated planning specification for urban engineering pipelines GB50289-2016 and the 10.0.2.4 item of design specification for urban residential district GB50180-93 (2016), the horizontal clear distance between the pipelines and the building can be reduced according to the actual situation after safety technical measures are taken.
In "protection planning code for famous city of historical culture" GB50357, it is clearly indicated that "when various municipal pipelines are laid underground, and the clear distance between pipelines and between the pipelines and the building (structure) cannot meet the conventional requirements due to the narrow underground space, engineering measures should be taken to meet the safety, maintenance, etc. of the pipelines. "
Disclosure of Invention
In order to overcome the technical defects, the invention provides a geomembrane isolation process for reducing the horizontal clear distance between pipelines and buildings and between pipelines, which is simple in method and easy to operate, mainly aims at laying construction of water supply pipelines and gas pipelines, and can effectively realize the effect of reducing the horizontal clear distance between the water supply pipelines or the gas pipelines and between the pipelines and the buildings and between the pipelines, and adopts the following technical scheme in order to realize the purpose:
a geomembrane isolation process for reducing the horizontal clear distance between a pipeline and a building or pipeline comprises the following steps:
step 1: and excavating a base surface, cleaning the base surface, and tamping after the cleaning is finished to ensure that the base surface is compact and flat.
Step 2: and laying a geomembrane on the base surface, isolating the position of the water or gas pipeline to be laid from the building by using the geomembrane, and isolating the water or gas pipeline to be laid from other hollow pipelines adjacent to the water or gas pipeline to be laid by using the geomembrane.
And step 3: and after the geomembrane is laid, backfilling soil in the soil foundation to form a foundation cushion layer for laying the pipeline.
And 4, step 4: and laying a pipeline, backfilling after the laying is finished, compacting, and laying a road base layer and a road surface layer.
Further, in the step 1, the cross-sectional shape of the base surface is a trapezoid.
Further, in the step 2, when no other pipeline exists around the water supply or gas pipeline to be laid beside the building, a geomembrane is laid between the water supply or gas pipeline to be laid and the building, and a geomembrane is laid below the water supply or gas pipeline to be laid, wherein the geomembrane is laid in an L shape with one side inclined.
Further, in the step 2, the distance between one end, away from the building, of the geomembrane below the isolated water supply or gas pipeline and the building is not less than the minimum horizontal clear distance between the water supply or gas pipeline and the building, which is specified by the standard.
Further, in step 2, when the water supply or gas pipeline to be laid needs to be laid between the building and other laid hollow pipelines, a geomembrane is laid between the water supply or gas pipeline to be laid and the building, a geomembrane is laid below the water supply or gas pipeline to be laid, a geomembrane is laid between the water supply or gas pipeline to be laid and the adjacent laid pipeline, and a geomembrane is laid above the other pipeline adjacent to the water supply or gas pipeline to be laid.
Further, in step 2, the distance between the circumferential outer wall of the to-be-laid water supply or gas pipeline on one side of the to-be-laid pipeline and one end, far away from the to-be-laid pipeline, of the geomembrane above the to-be-laid pipeline is not less than the minimum horizontal clear distance between the to-be-laid pipeline and the pipeline specified in the standard, and the distance between one end, far away from the to-be-laid pipeline, of the geomembrane above the to-be-laid pipeline and the building is not less than the minimum horizontal clear distance between the to-be-laid water supply or gas pipeline.
Further, in the step 2, the laying of the geomembrane includes the following specific steps:
step (1): and (5) accurately measuring the size, and cutting the geomembrane.
Step (2): and laying the geomembrane, and connecting the adjacent geomembrane joints by adopting a thermal bonding or gluing or lapping method.
And (3): and flattening and tightly adhering the geomembranes and the geomembranes to the base surface.
Further, in the step 2, the geomembrane is a two-cloth one-film composite geomembrane which comprises two layers of 300-400 g/m2 non-woven geotextile and a geomembrane with the thickness of 1mm in the middle of the non-woven geotextile.
Further, in the step 4,
the permeability coefficient of the backfill soil, the road base layer and the road surface layer in the laying range of the geomembrane is not less than 1.0 × 10- 6cm/s, when the permeability coefficient of the road base layer and the road surface layer is less than 1.0 × 10-6And when the density is cm/s, the road cushion layer and the road surface layer adopt the sand-free concrete, so that the concrete void ratio is increased.
The invention has the beneficial effects that:
according to the pipeline laying construction process, the geomembranes are arranged between the pipelines and the building and between the pipelines for isolation, so that the problem that the horizontal clear distance between the pipelines and the building and the horizontal clear distance between the pipelines cannot meet the requirements is effectively solved, the actual horizontal distance between the pipelines and the building and between the pipelines is reduced, the pipelines can be laid in a limited space, and the safety and the maintenance requirements of the pipelines can be guaranteed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a flow chart of the construction process of the present invention;
fig. 2 is a schematic view of geomembrane laying according to example 1 of the present invention;
fig. 3 is a schematic view of geomembrane laying according to example 2 of the present invention;
wherein: 1. water supply pipeline, 2 building, 3 geomembrane, 4 gas pipeline, 5 rain sewage, electric power and communication pipeline.
Detailed Description
As introduced by the background art, municipal pipelines under urban roads are increasingly complex, particularly for historical culture famous city protection areas, the width of the roads in the areas is small, the types of the pipelines needing to be laid are multiple, and the horizontal clear distance between the pipelines cannot be guaranteed.
The application range of the invention is only limited in the historical culture block, the temperature of the heat distribution pipeline is high, the invention is not suitable for a geomembrane isolation method, the standard distance between the electric power pipeline and the communication pipeline and the building is originally very small, protective measures are not necessary to be taken, and the drainage pipeline of the historical culture block is generally not arranged beside the building, therefore, the construction process of the invention mainly aims at the water supply pipeline and the gas pipeline, after the two pipelines leak, the bearing capacity of the foundation soil of the building can be reduced due to water seepage, the building can be subjected to uneven settlement, and the cracking and even the structural safety can be influenced; seepage water penetrates through the building foundation, and the foundation structure is adversely affected; the water seeping into the room directly affects the life of residents. The leaked natural gas can enter cavities of buildings and pipelines, and can cause explosion accidents when meeting open fire after being gathered to a certain concentration. The geomembrane has excellent waterproof and gas-insulating functions, can prevent water supply pipelines and gas pipelines from leaking and then permeating into buildings (structures), and ensures the safety of the buildings (structures), pipelines and personnel. Therefore, the geomembrane is adopted to isolate the water supply pipeline and the gas pipeline.
As shown in fig. 1-3, comprising the steps of:
step 1: excavating a trapezoidal base surface, cleaning the base surface, particularly thoroughly cleaning impurities such as sharp stones, tree roots and the like, allowing a local concave-convex phenomenon to exist on the upper part of the base surface, and tamping by using a tamping hammer or a tamping plate after cleaning to ensure that the base surface is compact and flat.
Step 2: and laying a geomembrane on the base surface, and isolating the position of the water supply or gas pipeline to be laid from other hollow pipelines such as a building and drainage or electric power or communication adjacent to the water supply or gas pipeline to be laid by using the geomembrane.
In embodiment 1 of the application, when there is no other pipeline around the water supply pipeline to be laid beside the building, a geomembrane 3 is laid between the water supply pipeline to be laid and the building 2, and a geomembrane 3 is laid below the water supply pipeline, the geomembrane is laid on a soil foundation, the geomembrane is laid in an L shape with one side inclined, and a distance L1 between an end a of the geomembrane below the water supply pipeline, which is far away from the building, and a surface B of the building is not less than a horizontal clear distance specified by a standard, wherein the horizontal clear distance specified by the standard refers to a minimum horizontal clear distance between the water supply pipeline specified in 4.1.9 in the comprehensive planning specification for urban engineering pipelines GB 50289-2016.
The working principle of the laying process is as follows: if there is no geomembrane protection, the water supply pipe in fig. 2 should be laid beyond point a, and the minimum clear distance between the water supply pipe and the building, i.e., the distance AB, should meet the specification. After the distance between the water supply pipe and the building meets the specification requirement, if the water supply pipe is leaked, the influence of settlement and the like on the building can not be caused. After the geomembrane is adopted for protection, although the distance between the water supply pipe and the building is reduced, the geomembrane has good waterproof performance, after the water supply pipe leaks, the leaked water can reach the foundation of the building only by bypassing the point A, and the distance between the point A and the point B of the building meets the standard requirement, so that the water leakage can not cause sedimentation influence on the building. And the actual distance between the pipeline and the building is smaller than the minimum clear distance specified by the specification, so that the actual distance between the pipeline and the building is reduced after the geomembrane is laid for isolation.
The geomembrane used in the application adopts a two-cloth one-film composite geomembrane for the geomembrane, and comprises two layers of 300-400 g/m2A non-woven geotextile and a 1mm thick geomembrane in the middle of the non-woven geotextile. The anti-seepage device has the advantages that a good anti-seepage effect can be achieved, when a water supply pipeline has a leakage accident, the water in the water supply pipeline can be well prevented from leaking, sedimentation damage to building foundations and the like is avoided, and pollution to underground water is also avoided.
The laying of the geomembrane comprises the following specific steps:
step (1): and (5) accurately measuring the size, and cutting the geomembrane.
Step (2): the geomembrane is laid, the stress is required to be minimum when the geomembrane is laid, raw materials are saved as much as possible on the premise of ensuring the quality, the arrangement direction of the joints is generally parallel to the direction of the maximum gradient, adjacent geomembrane joints are connected by adopting a hot sticking method, an adhesive method or a lap joint method, oil stains and dust cannot be generated at the joints, the joints are required to be tidy and attractive, the phenomena of sliding welding and jumping cannot occur, and the arrangement direction of the geomembrane joints is parallel to the direction of the maximum gradient.
And (3): and flattening and tightly adhering the geomembranes and the geomembranes to the base surface. The geomembrane is not required to be pulled too tightly, but is generally slightly loose, and if the geomembrane is found to have a punctured or torn part, the geomembrane is adhered and supplemented by geomembrane glue with the area three times as large as the damaged area.
And step 3: and after the geomembrane is laid, backfilling soil in the soil foundation to form a foundation cushion for pipeline laying, wherein the size of the foundation cushion can meet the construction standard requirement of pipeline laying.
Step 4, laying pipelines, backfilling after laying, compacting, and laying a road base layer and a road surface layer, wherein the coefficient of permeability of the backfilling soil above the geomembrane, the road base layer above the geomembrane and the road surface layer above the geomembrane are not less than 1.0 × 10-6And cm/s, the road base layer and the road surface layer adopt sand-free concrete, and the concrete void ratio is increased. The purpose is once water or natural gas that water supply pipeline, gas pipeline leaked are blockked by geomembrane and can not get into building and other professional pipeline cavity, and can discharge from water supply, gas pipeline top through backfill layer, roadbed layer, pavement layer, people can discover the sign of leaking from ground or road surface very easily, in time maintain.
In another embodiment 2 of this application, when there are other rain sewage, electric power and communication pipeline around the gas laying pipeline to be laid, the gas pipeline needs to be laid between building and rain sewage, electric power, communication pipeline 5, lays geomembrane 3 between gas pipeline and building 2, lays geomembrane 3 below the gas pipeline, lays geomembrane 3 between gas pipeline and rain sewage, electric power, the communication pipeline, lays the geomembrane above rain sewage, electric power, the communication pipeline, the geomembrane is trapezoidal distribution. The distance L2 between the end C of the geomembrane far away from the building and the surface B of the building is not less than the horizontal clear distance specified in the standard, wherein the horizontal clear distance specified in the standard refers to the minimum horizontal clear distance between 4.1.9 gas pipelines and the building in the urban engineering pipeline comprehensive planning specification GB50289-2016, the distance L3 between the end D of the side circumferential pipe wall of the gas pipeline on one side of the rain sewage, electric power and communication pipelines and the end C on the geomembrane is not less than the horizontal clear distance specified in the standard, and the horizontal clear distance specified in the standard refers to the horizontal clear distance requirement between 4.1.9 gas pipelines and the rain sewage, the electric power and the communication pipelines in the urban engineering pipeline comprehensive planning specification GB 50289-2016.
The principle is as follows: the minimum clear distance between the storm sewage, electrical, communication pipe 5 and the gas pipe in fig. 3 should meet the specification requirements, provided that there is no protection of the geomembrane. After meeting the standard requirement, if the gas pipe leaks in case, the gas of leaking can not cause accidents such as explosion through soil diffusion to in rain sewage, electric power, the communication pipeline cavity. After the geomembrane is adopted for protection, the distance between the rainwater and sewage, the electric power and the communication pipeline 5 and the gas pipe is small, and the geomembrane has good gas isolation performance, so that gas leaked from the gas pipe can reach the drain pipe only by bypassing the point C, and the distance from the point C to the point D to the drain pipe is greater than or equal to the requirement of the clear distance between the gas pipe and the rainwater and sewage, the electric power and the communication pipeline specified by the specification, so that the gas leakage cannot spread into the cavity of the drain pipe, and the safety purpose is achieved. Similarly, after the gas pipeline leaks, due to the isolation effect of the geomembrane, the leaked gas needs to bypass the point C and then reach the building, and at the moment, the distance between the point C and the point B of the building is larger than the minimum horizontal clear distance between the gas pipeline and the building specified in the specification, so that the requirement of the specification is met.
The rest of the procedure was the same as in example 1.
Methods of excavation of a base surface, design of a pipeline foundation pad, excavation, laying of a pipeline and the like are existing well-established technologies and are not described in detail in the application.
Compared with a concrete isolation wall, the geomembrane isolation wall has obvious advantages in the aspects of water resistance, gas insulation performance, occupied space, construction, cost and the like.
The geomembrane isolation measure is adopted, so that the horizontal clear distance between a water supply pipeline and a gas pipeline in a historical culture block and between a building (structure) and other professional pipelines can be reduced, the operation safety of engineering pipelines is guaranteed, and the management and the maintenance are convenient.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (6)
1. The geomembrane isolation construction process for reducing the requirement of horizontal clear distance between a pipeline and a building comprises the following steps of:
step 1: excavating a base surface, wherein the cross section of the base surface is trapezoidal, cleaning the base surface, and tamping after cleaning to ensure that the base surface is compact and flat;
step 2: laying a geomembrane on the base surface, isolating the position of a water or gas pipeline to be laid from a building by using the geomembrane, and isolating the water or gas pipeline to be laid from other hollow pipelines adjacent to the water or gas pipeline to be laid by using the geomembrane;
when no other pipelines are arranged around a water supply or gas pipeline to be laid beside a building, a geomembrane is laid between the water supply or gas pipeline to be laid and the building, and the geomembrane is laid below the water supply or gas pipeline to be laid, wherein the geomembrane is laid in an L shape with one side inclined;
when the water supply or gas pipeline needs to be laid between a building and other laid hollow pipelines, a geomembrane is laid between the water supply or gas pipeline and the building, the geomembrane is laid below the water supply or gas pipeline, the geomembrane is laid between the water supply or gas pipeline and the adjacent laid pipeline, and the geomembrane is laid above the other pipelines adjacent to the water supply or gas pipeline to be laid;
and step 3: after the geomembrane is laid, backfilling soil in the soil foundation to form a groove for laying the pipeline;
step 4, laying pipelines, backfilling after laying, compacting, and laying a road base layer and a road surface layer, wherein the permeation coefficients of the backfilling and the road base layer and the road surface layer in the laying range of the geomembrane are not less than 1.0 × 10-6cm/s。
2. The geomembrane isolation construction process for reducing the horizontal clear distance requirement between the pipeline and the building as claimed in claim 1, wherein in the step 2, the distance between the end of the geomembrane below the water supply or gas pipeline far away from the building and the building is not less than the minimum horizontal clear distance between the water supply or gas pipeline and the building specified by the standard.
3. The geomembrane isolation construction process for reducing the requirement of the horizontal clear distance between the pipeline and the building according to claim 2, wherein in the step 2, the distance between the peripheral outer wall of the pipeline to be laid on the side of the laid pipeline adjacent to the pipeline and the end of the geomembrane above the laid pipeline far away from the pipeline to be laid is not less than the minimum horizontal clear distance between the pipeline specified in the standard, and the distance between the end of the geomembrane above the laid pipeline far away from the pipeline to be laid and the building is not less than the minimum horizontal clear distance between the pipeline to be laid and the building specified in the standard.
4. The geomembrane isolation construction process for reducing the requirement of horizontal clear distance between a pipeline and a building according to claim 1, wherein the step 2, the laying of the geomembrane comprises the following specific steps:
step (1): accurately measuring the size, and cutting the geomembrane;
step (2): laying the geomembrane, and connecting adjacent geomembrane joints by adopting a hot sticking or gluing or lapping method;
and (3): and flattening and tightly adhering the geomembranes and the geomembranes to the base surface.
5. The geomembrane isolation construction process for reducing the requirement of horizontal clear distance between a pipeline and a building according to claim 1, wherein in the step 2, the geomembrane is a two-cloth one-film composite geomembrane comprising two layers of 300-400 g/m2A non-woven geotextile and a 1mm thick geomembrane in the middle of the non-woven geotextile.
6. The geomembrane isolation construction process for reducing the requirement of the horizontal clear distance between the pipeline and the building as claimed in claim 1, wherein in the step 4, the road base layer and the road surface layer adopt non-sand concrete, so that the concrete void ratio is increased.
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| CN202913366U (en) * | 2012-11-12 | 2013-05-01 | 中交第二公路勘察设计研究院有限公司 | Device for repairing waterproof and drainage capacity of original medial strip of road in non-excavation manner |
| CN203498819U (en) * | 2013-08-22 | 2014-03-26 | 中工国际工程股份有限公司 | Expansive soil foundation construction |
| CN107401181B (en) * | 2017-08-10 | 2019-07-12 | 温州市华昌建设有限公司 | A kind of municipal network system and construction method |
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| GB2469770A (en) * | 2009-04-23 | 2010-10-27 | Tubosider United Kingdom Ltd | A drainage bed |
| CN101906785A (en) * | 2010-07-23 | 2010-12-08 | 中国石油集团川庆钻探工程有限公司 | Method for performing anti-seepage treatment on petroleum drilling site by adopting composite geomembrane |
| CN204703179U (en) * | 2015-06-10 | 2015-10-14 | 新疆三星建工集团有限公司 | A kind of composite geo-membrane sloping core cofferdam |
| CN205335804U (en) * | 2016-02-04 | 2016-06-22 | 黄河勘测规划设计有限公司 | Be suitable for cable directly buried installation structure in wet frozen soil area of high and cold height |
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