CN112228631A

CN112228631A - Pipeline reinforcing system

Info

Publication number: CN112228631A
Application number: CN202011209197.1A
Authority: CN
Inventors: 赵斌; 云晨; 杨伟; 庞慧萍
Original assignee: Hohhot China Gas Urban Gas Development Co ltd
Current assignee: Hohhot China Gas Urban Gas Development Co ltd
Priority date: 2020-11-03
Filing date: 2020-11-03
Publication date: 2021-01-15

Abstract

The invention provides a pipeline reinforcing system, comprising: the foundation pit is positioned below the road surface and is provided with an inclined pit wall; the cushion layer is positioned at the bottom of the foundation pit; a plurality of retaining walls positioned on the cushion layer; the cover plate is positioned on the plurality of protective walls, and an accommodating space is enclosed by every two adjacent protective walls and the cover plate along the horizontal direction extending along the vertical pipeline; the pipeline is positioned in the accommodating space; wherein, the accommodating space is internally provided with backfill sand, and backfill soil is arranged among the foundation pit, the retaining wall and the cover plate. According to the pipeline reinforcing system provided by the embodiment of the invention, the compressive strength of the pipeline is increased, and meanwhile, the economic benefit is good, the construction is simple and rapid, and the normal road and bridge construction is not influenced.

Description

Pipeline reinforcing system

Technical Field

The invention relates to the field of multipurpose pipeline laying, in particular to a secondary high-pressure gas pipeline reinforcing system.

Background

In the road construction process, in order to obtain a flat road surface structure, the paved road surface material is generally rolled, and the vehicle can be driven after the pavement material is compacted and leveled. Meanwhile, in order to make the road surface have sufficient strength and compressive capacity, a multi-layer pavement structure is mostly adopted when paving the road surface, for example, rubber asphalt is generally spread on the surface of the asphalt road surface to form a rubber asphalt layer, crushed stone is paved on the rubber asphalt layer to form a crushed stone layer, and then an emulsified asphalt layer is paved on the crushed stone layer. Although the road surface having such a structure has good adhesive strength and water resistance, the load-bearing capacity is still insufficient, and cracks are likely to occur when a heavy vehicle passes.

Furthermore, because the existing road surface structure is not only a single road, but also often accompanied by crossing with other pipe networks, such as cable networks, natural gas pipelines, tap water pipelines, etc., most of the existing road surface structures are buried under the roadbed, the installation and safety of the internal pipelines also need to be considered when the road is laid. Particularly, the gas pipe is a special pipeline for conveying combustible gas, when the natural gas is developed, the purity is not high, more impurities are contained, the natural gas can be formed only through special treatment, the national soil area of China is large, the population distribution is wide, the conveying distance is longer, the erected pipeline is easily damaged by weather or environmental influence, and therefore the pipeline section which is easily damaged needs to be reinforced and protected by the safety protection device.

Pipeline safety device in the existing market has certain defect when using, and traditional pipeline safety device adopts and installs an integral sleeve pipe additional or builds the trench by laying bricks or stones and fixes, and material intensity is not high, causes the protection measure easily when receiving great external force to influence and is cracked simultaneously with the protected pipeline. And difficult dismantlement, it is comparatively difficult during the installation, and can only fix the pipeline of regulation size, can't be applicable to the fixed protection of multiple specification pipeline, have certain limitation, are eliminated easily. In addition, the traditional protection structure is lower in connection strength with the road, so that the strength of the road surfaces on two sides of the pipe network is inconsistent with that of the road surface on the right upper side of the pipe network, and after a period of time, the phenomenon of fault easily occurs, so that the quality of road engineering is influenced.

Disclosure of Invention

The object of the present invention is therefore to overcome the above technical problems, in order to be able to protect vehicles from damage to buried pipelines with high efficiency and low cost.

The invention provides a pipeline reinforcing system, comprising:

the foundation pit is positioned below the road surface and is provided with an inclined pit wall;

the cushion layer is positioned at the bottom of the foundation pit;

a plurality of retaining walls positioned on the cushion layer;

the cover plate is positioned on the plurality of protective walls, and an accommodating space is enclosed by every two adjacent protective walls and the cover plate along the horizontal direction extending along the vertical pipeline;

the pipeline is positioned in the accommodating space;

wherein, the accommodating space is internally provided with backfill sand, and backfill soil is arranged among the foundation pit, the retaining wall and the cover plate.

Wherein the slope ratio of the pit wall is less than or equal to 1:1 and greater than or equal to 1: 0.8.

Wherein a temperature deformation joint is reserved between the adjacent protecting walls.

Wherein the top width of the retaining wall is less than the bottom width.

Wherein, the bed course, dado are formed by concrete placement, and the apron is reinforcing bar-concrete prefabricated component.

Wherein, the thickness of bed course is more than or equal to 50 millimeters, and the height of dado is more than or equal to 1 meter, and the length along pipeline extending direction is less than or equal to 50 meters.

Wherein, the distance between the pipeline and the protective wall is more than or equal to 200 mm.

Wherein, the backfill sand is divided into a plurality of layers which are tamped layer by layer, and the thickness of each layer is 250 to 300 millimeters.

Wherein, apron top both sides have rings, and apron top middle part has warning area.

Wherein, the backfill soil is divided into at least two sides, the bottom layer is a compacted coating with the thickness of 1 meter, and the thickness of each layer above is different from 50 to 1000 millimeters.

Wherein, the dado top have with apron tip complex fixed slot, the card post of rings bottom and the rings joint groove cooperation of fixed slot bottom. Wherein the clamping column is in a cylindrical shape with a narrow upper part and a wide lower part. Wherein the size of the clamping column is smaller than that of the hollow cavity of the cover plate, the lifting stage is increased, and the jacking pin which is reserved on the side of the top of the protective wall in the mounting stage is used as a sliding stopper.

And at least part of the support rods at the top of the foundation pit are remained in the foundation pit after the reinforcing procedure is completed in the stage of excavating the foundation pit to expose the old pipeline. Wherein, the sunshade net laid on the supporting rod is kept on the interface of the backfill soil and the pit wall after the reinforcing procedure is finished.

Wherein, the pipeline includes at least one or the combination of gas pipeline, electric power pipeline, water supply pipe, communication pipeline.

In the process of pouring the retaining wall, the embedded steel pulling bars adopt HRB400(3) -grade steel bars, and a protective layer with the thickness of 20mm is arranged on the surfaces of the steel pulling bars to prevent corrosion.

Wherein the fine sand is mixed with filler particles having a negative temperature expansion coefficient. The volume mixing ratio of the fine sand to the filler is more than or equal to 100:1 and less than or equal to 1000: 1. Wherein the material with negative thermal expansion coefficient comprises one or more of the following compounds: ZrW₂O₈、ZrMo₂O₈、HfW₂O₈HfMo₂O₈、 ScW₃O₁₂、AlW₃O₁₂、Zr(WO₄)(PO₄)₂、ScF₃-BaF₂-YF₃、ScF₃-BaF₂-ZnF₂、 ScF₃-BaF₂-InF₃、ScF₃-MgF₂、YbF₃-ScF₃、LuF₃-ScF₃、Zn(CN)₂、BeF₂、B₂O₃And a zeolite.

Wherein, the warning area is the coating that contains phosphor powder or colored paint for mark pipeline protective structure's buried depth, provide convenience for follow-up maintenance. Furthermore, the warning belt comprises a pressure-sensitive element, when the upper pressure exceeds a preset threshold value, the warning belt sends a warning to a nearby controller in a Near Field Communication (NFC) or Bluetooth communication mode, and the controller forwards the pressure warning to the server.

The pipeline reinforcing system provided by the embodiment of the invention has the following advantages:

1) the method realizes the operation without stopping transmission and ensures that downstream users are not influenced.

2) The mechanical property of the protection pipe gallery is enhanced, and the pipeline is protected more effectively.

3) The method is economical, reasonable, short in implementation period, safe and reliable. The working efficiency is improved, and the investment is greatly saved.

4) Practice proves that the technology can well meet the construction requirement of secondary high-pressure gas pipeline reinforcement, overcomes the defects of large investment, difficult construction, long construction period and multiple procedures of the traditional method, can be applied to other similar construction environments and conditions, and has good social and economic benefits and popularization and application benefits.

In conclusion, according to the pipeline reinforcing system provided by the embodiment of the invention, the compressive strength of the pipeline is increased, and meanwhile, the economic benefit is good, the construction is simple and rapid, and the normal road and bridge construction is not influenced.

The stated objects of the invention, as well as other objects not listed here, are met within the scope of the independent claims of the present application. Embodiments of the invention are defined in the independent claims, with specific features being defined in the dependent claims.

Drawings

The technical solution of the present invention is explained in detail below with reference to the accompanying drawings, in which:

FIG. 1 illustrates a cross-sectional view of a pipe reinforcement system in accordance with an embodiment of the present invention;

FIG. 2 is an enlarged view of the joint of the cover plate and the retaining wall of the pipe reinforcement system shown in FIG. 1; and

FIG. 3 shows a schematic view of another embodiment of a retaining wall in the pipe reinforcing system shown in FIG. 1.

Detailed Description

The features and technical effects of the technical solution of the present invention will be described in detail below with reference to the accompanying drawings and illustrative embodiments, disclosing a system capable of protecting a heavy-duty vehicle from damaging an air supply duct with high efficiency and low cost. It is noted that like reference numerals refer to like structures and that the terms "first", "second", "upper", "lower", and the like as used herein may be used to modify various structures. These modifications do not imply a spatial, sequential, or hierarchical relationship to the structures being modified unless specifically stated.

In the specification, the road is a Jinsheng expressway in a new Mongolian and Linger district, the Nangusheng expressway is intersected with a north loop planned in the new district, the north-to-south Bicycles of Hui city are intersected with a Zhaowada expressway, the total length of the route is about 20.297km, the road grade is an urban expressway, and the design speed is 80 km/h. Is a bidirectional four-lane. Most of the vehicles running on the road are heavy-duty trucks, the traffic flow is large, the load is large, and the pressure of the pipeline buried under the road is large. For this purpose, the reinforcement system disclosed in the present description is used to reinforce the protection of the pipeline over a 1300-meter stretch according to the pipeline layout.

As shown in fig. 1, the pipe reinforcing system according to the preferred embodiment of the present invention includes a foundation pit or trench dug down from the road surface to expose previously buried pipes including, but not limited to, gas pipes, power pipes, water supply pipes, communication cable pipes, etc. Taking the gold-filled road secondary high-pressure gas pipeline as an example, a pipe trench in the protection range is excavated by adopting a manual or small excavator, a sectional excavation mode is adopted, and the excavation length of each section is not more than 50 meters, so that the construction progress and the requirements of environmental protection and traffic are balanced. The slope-laying proportion of the pit wall of the foundation pit is to ensure that the pipe groove and the piled soil are stable and do not collapse. In a preferred embodiment, the ratio of the slope of the pit wall (e.g. the ratio of the difference in width between the top and bottom of the pit to the height of the pit) is preferably less than or equal to 1:1 to prevent collapse, but preferably greater than 1:0.8 to speed up the construction process and reduce cost, most preferably 1: 0.75. In the construction process, in order to avoid exposing the natural gas pipeline to the sun for a long time, a black sunshade net is preferably supported by a hard temporary support rod such as a steel pipe when the natural gas pipeline is excavated to the top of the pipe, namely the top of the pipeline is exposed. At least a portion of these temporary support rods may remain within the excavation after the subsequent reinforcement process is completed to further enhance the compressive resistance. Further, after the sunshade is finished, the black sunshade net can be retained and laid on the surface of the pit wall to enhance the bonding strength between the pit wall and the backfill soil, so that additional adhesion enhancing materials can be omitted, and the expenditure is saved.

When the excavation is made down to the designed elevation of the underlayment base, where the pipe is fully exposed, concrete, such as that available under the trade designation C20, is poured from the sides and bottom of the pipe to form the underlayment to provide a high quality foundation for the entire reinforcement system. The thickness of the cushion layer is, for example, 50mm or more, preferably 70mm or more, and most preferably 100 mm. Preferably, a plurality of fixing anchors (not shown) are provided on at least the bottom surface of the bedding layer, integrally formed as the same material as the bedding layer, and the bottom dimension of the fixing anchors is larger than the top dimension thereof, for example, in an inverted cone shape or a claw shape, so as to improve the bonding strength between the bedding layer and the foundation layer of the pit bottom and to prevent the reinforcing system from being deviated in the horizontal direction due to the upper unilateral weight pressure.

Subsequently, a plurality of retaining walls, such as a left retaining wall a and a right retaining wall B, are formed on the cushion layer by formwork and pouring concrete materials, as shown in fig. 1. When the duct is a plurality of ducts at a small pitch, only two retaining walls a and B may be provided. When the duct is a plurality of ducts at large intervals or a plurality of ducts of different types (e.g. a combination of at least two of gas, water supply, electricity, communication), more retaining walls may be provided to form more than two channels between adjacent retaining walls. The environmental category of the retaining wall member is class two b, and the member adopts C30 concrete. Preferably, the length of the protecting wall along the extending direction of the pipeline (vertical to the paper surface) is less than or equal to 50 meters, preferably 40-10 meters, preferably 20 meters, a temperature deformation joint is left between the adjacent protecting walls along the extending direction of the pipeline, the width of the joint is 20mm for example, and asphalt hemp threads or asphalt-coated wood boards are filled between the joints, so that the stress caused by the thermal expansion of the concrete protecting wall is relieved. The height of the retaining wall from the top to the bottom is typically 1m or more, preferably 1.5m, to provide sufficient accommodation space for the pipes. As shown in fig. 1, the retaining wall is convex, i.e. comprises a narrower upper part and a wider lower part. In addition, as shown in FIG. 3, the retaining wall may also take other configurations, such as a three-stage trapezoidal platform shown on the left side of FIG. 3, a single trapezoidal platform shown in the middle, and a three-stage square platform shown on the right side. In fact, the retaining wall is only required to have an upper width (in the direction of extension of the vertical duct) smaller than a lower width, on the one hand to improve the stability of the retaining wall itself and on the other hand to gradually increase the pressure resistance to relieve the stresses in the internal space, and the non-smooth side walls are more likely to improve the bonding force with the adjacent material. In the process of pouring the retaining wall, the embedded steel pulling bars adopt HRB400(3) grade steel bars, and a 20mm protective layer is arranged on the surfaces of the steel pulling bars to prevent corrosion. The distance between the bottom of the retaining wall and the outer side of the pipeline and the distance between the top of the retaining wall and the top of the pipeline are both larger than or equal to 200mm so as to prevent accidental impact. In an embodiment of the invention, the outer diameter of the pipe is for example 350 mm. Preferably, D508 anticorrosion steel pipes are adopted to replace the existing old pipelines, and the protection capability is improved.

And then, fine sand is backfilled in the space surrounded by the two side protective walls, so that the vibration of the pipeline from the outside is relieved. The average particle size of the fine sand is 500 microns or less, preferably 200 microns or less, and most preferably 100 microns or less. In the construction process, every 300mm of backfill is compacted manually or by a small machine, and the compaction coefficient is not less than 0.96. In a preferred embodiment, negative temperature coefficient of expansion filler particles are also mixed into the fine sand. For example, a material having a negative coefficient of thermal expansion comprises one or more of the following compounds: ZrW₂O₈、ZrMo₂O₈、HfW₂O₈HfMo₂O₈、ScW₃O₁₂、AlW₃O₁₂、Zr(WO₄)(PO₄)₂、ScF₃-BaF₂-YF₃、ScF₃-BaF₂-ZnF₂、ScF₃-BaF₂-InF₃、ScF₃-MgF₂、YbF₃-ScF₃、 LuF₃-ScF₃、Zn(CN)₂、BeF₂、B₂O₃And a zeolite. The fillers with negative temperature expansion coefficients can shrink when fine sand generates heat due to friction or is exposed to high temperature in summer due to continuous heavy pressure for a long time, and gaps are left, so that the stress between the protective wall and the pipeline is relieved, and the phenomenon that the fine sand overflows or the pipeline is damaged due to overlarge pressure is avoided. The volume mixing ratio of the fine sand and the filler may be 100:1 or more and 1000:1 or less, preferably 300:1 to 500:1, and most preferably 400: 1.

And after the fine sand is backfilled until the fine sand is level to the top of the retaining wall, hoisting the cover plate to the position above the retaining wall and bridging and placing. The cover plate is, for example, a 500mm wide, 200mm thick concrete reinforcement (three-level steel phi 12 double-layer bi-directional @ 150) prefabricated cover plate with a design load of 50T. The top of the cover plate is provided with a hanging ring or a hanging hook which is used for being connected with the hanging hook of a crane, a reinforcing steel bar with the diameter of 12mm is adopted, an anti-corrosive coating on the surface of the reinforcing steel bar is an epoxy asphalt coating, and the thickness of the coating is more than or equal to 200 microns. Preferably, the top of the cover plate is also provided with a warning tape, such as a coating containing fluorescent powder or colored paint, which is used for indicating the burial depth of the pipeline protection structure and providing convenience for subsequent overhaul. More preferably, the warning tape comprises a pressure-sensitive element, when the upper pressure exceeds a preset threshold value, a warning is sent to a nearby controller through Near Field Communication (NFC), Bluetooth communication and the like, and the controller forwards the pressure warning to the server, so that road maintenance personnel are reminded to arrive at the site in time for processing or maintenance.

As shown in fig. 2, the top of the retaining wall has an L-shaped fixing groove (or a space formed by the one-sided fixing protrusion and the top surface) for engaging with the top end of the cover plate. Preferably, the hanging ring or the hook on the top surface of the cover plate extends downwards to extend through the cover plate body to form a clamping column which is made of metal and is narrow at the top and wide at the bottom, the size of the clamping column is slightly smaller than that of the hollow cavity of the cover plate, and the top pin which is increased in the hoisting stage and can be left on the side of the top of the protective wall in the mounting stage is used as a sliding stopper. The top of the retaining wall is provided with a clamping groove matched with the clamping column, so that the cover plate is effectively prevented from sliding in a translation manner.

And after the cover plate is installed, backfilling soil into the foundation pit. Preferably, the backfill soil is divided into at least two layers, the thickness of the lower layer is 1m, manual or small-sized mechanical compaction is adopted, the applied equivalent total weight is not more than 2T, otherwise, the safety of the natural gas pipeline during construction cannot be ensured; the thickness of the upper layer is selected according to the road surface condition and may comprise various gravels, soil or asphalt, etc., and the total thickness thereof is varied from 50 to 1000 mm.

And finally, continuing to construct the road pavement above the backfill soil, wherein the road pavement can be a cement pavement or an asphalt pavement.

According to the pipeline reinforcing system provided by the embodiment of the invention, the compressive strength of the pipeline is increased, and meanwhile, the economic benefit is good, the construction is simple and rapid, and the normal road and bridge construction is not influenced.

While the invention has been described with reference to one or more exemplary embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the disclosure without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed as the best mode contemplated for carrying out this invention, but that the disclosed system configuration and method of manufacture will include all embodiments falling within the scope of the present invention.

Claims

1. A pipeline strengthening system comprising:

the cushion layer is positioned at the bottom of the foundation pit;

a plurality of retaining walls positioned on the cushion layer;

the pipeline is positioned in the accommodating space;

2. The pipe reinforcing system according to claim 1, wherein a slope ratio of the pit wall is 1:1 or less and 1:0.8 or more.

3. The pipe reinforcing system of claim 1, wherein a temperature deformation joint is left between adjacent retaining walls.

4. The pipe reinforcing system of claim 1, wherein the retaining wall top width is less than the bottom width.

5. The pipe reinforcing system according to claim 1, wherein the bedding layer and the retaining wall are formed by concrete casting, and the cover plate is a steel bar-concrete prefabricated member.

6. The pipe reinforcing system of claim 5, wherein the mat has a thickness of 50mm or more, the retaining wall has a height of 1m or more, and a length in the pipe extending direction of 50m or less.

7. The pipe strengthening system of claim 1, wherein a spacing between the pipe and the retaining wall is greater than or equal to 200 millimeters.

8. The pipe reinforcing system of claim 1, wherein the backfill sand is divided into layers that are tamped layer by layer, each layer having a thickness of 250 to 300 millimeters.

9. The pipe reinforcing system of claim 1, wherein the deck has hanging rings on both sides of the deck top and a warning band in the middle of the deck top.

10. The pipe reinforcing system of claim 1, wherein the backfill is divided into at least two sides, the bottom layer is a compacted coating with a thickness of 1 meter, and the thickness of the upper layers varies from 50 to 1000 mm.