Pipe reinforcement system

Abstract

The present invention provides a pipeline reinforcement system, comprising: a foundation pit, located below a road surface, and having an inclined pit wall; a cushion layer, located at the bottom of the foundation pit; a plurality of retaining walls, located on the cushion layer; a cover plate, located on the plurality of retaining walls, and each two adjacent retaining walls and the cover plate in the horizontal direction extending vertically from the pipeline form a receiving space; a pipeline, located in the receiving space; wherein the receiving space has backfill sand, and backfill soil is provided between the foundation pit and the retaining walls and the cover plate. The pipeline reinforcement system according to the embodiment of the present invention increases the compressive strength of the pipeline, and at the same time has good economic benefits, simple and quick construction, and does not affect normal road and bridge construction.

Description

Technical Field

[0001] The invention relates to the field of multi-purpose pipeline laying, and in particular to a sub-high pressure gas pipeline reinforcement system. Background Art

[0002] In the process of road construction, in order to obtain a smooth road surface structure, it is usually necessary to roll the laid road surface materials, and the materials must be compacted and leveled before they can be opened to traffic. At the same time, in order to make the road surface have sufficient strength and pressure bearing capacity, a multi-layer paving structure is mostly used when paving the road surface. For example, it is usually achieved by spreading rubber asphalt on the surface of the asphalt road surface to form a rubber asphalt layer, laying gravel on the rubber asphalt layer to form a gravel layer, and then laying an emulsified asphalt layer on the gravel layer. Although the road surface of this structure has good bonding strength and waterproofness, its load-bearing capacity is still insufficient and it is easy to crack when heavy vehicles pass by.

[0003] Moreover, since the current road surface structure is not just a single road, it is often accompanied by intersections with other pipeline networks, such as cable networks, natural gas pipelines, water pipelines, etc., most of which are buried under the roadbed, so the installation and safety of internal pipelines must be considered when paving roads. In particular, the gas pipe is a special pipeline for transporting combustible gas. When natural gas is developed, the purity is not high and contains more impurities. It needs to be specially treated to form gas. my country has a large land area, a wide population distribution, and a long transportation distance. The erected pipelines are easily damaged by weather or environmental influences. Therefore, it is necessary to use safety protection devices to strengthen the protection of vulnerable pipeline sections.

[0004] The pipeline safety protection devices currently on the market have certain defects when in use. Traditional pipeline safety protection devices are fixed by adding an integral casing or masonry trenches. The material strength is not high, and when affected by large external forces, it is easy to cause the protection measures and the protected pipeline to break at the same time. It is also difficult to disassemble and install, and can only fix pipes of specified sizes. It is not suitable for the fixed protection of pipes of various specifications. It has certain limitations and is easy to be eliminated. In addition, due to the low connection strength between the traditional protection structure and the road, the road surface on both sides of the pipeline network and the road surface directly above the pipeline network are inconsistent in strength. After a period of time, faults are prone to occur, which will also affect the quality of road projects. Summary of the invention

[0005] Therefore, the purpose of the present invention is to overcome the above technical problems so as to protect the buried pipelines from damage by vehicles in an efficient and low-cost manner.

[0006] The present invention provides a pipeline reinforcement system, comprising:

[0007] The foundation pit is located below the road surface and has sloping pit walls;

[0008] The cushion layer is located at the bottom of the foundation pit;

[0009] a plurality of retaining walls, located on the cushion layer;

[0010] A cover plate is located on the plurality of guard walls, and each two adjacent guard walls and the cover plate in the horizontal direction along which the vertical pipeline extends form a receiving space;

[0011] A pipeline is located in the accommodation space;

[0012] Among them, there is backfill sand in the accommodating space, and there is backfill soil between the foundation pit and the retaining wall and the cover plate.

[0013] Among them, the slope ratio of the pit wall is less than or equal to 1:1 and greater than or equal to 1:0.8.

[0014] Among them, temperature deformation joints are left between adjacent retaining walls.

[0015] Among them, the top width of the protective wall is smaller than the bottom width.

[0016] Among them, the cushion layer and the retaining wall are formed by pouring concrete, and the cover plate is a prefabricated steel-concrete part.

[0017] The thickness of the cushion layer is greater than or equal to 50 mm, the height of the protective wall is greater than or equal to 1 meter, and the length along the extension direction of the pipeline is less than or equal to 50 meters.

[0018] Among them, the distance between the pipe and the protective wall is greater than or equal to 200 mm.

[0019] Among them, the backfill sand is divided into multiple layers that are compacted layer by layer, and the thickness of each layer is 250 to 300 mm.

[0020] There are hanging rings on both sides of the top of the cover plate, and a warning tape in the middle of the top of the cover plate.

[0021] The backfill soil is divided into at least two sides, with the bottom layer being a compacted coating with a thickness of 1 meter, and the thickness of the upper layers ranging from 50 to 1000 mm.

[0022] The top of the guard wall has a fixing groove that matches the end of the cover plate, and the clamping column at the bottom of the lifting ring matches the lifting ring clamping groove at the bottom of the fixing groove. The clamping column is a cylindrical shape that is narrow at the top and wide at the bottom. The size of the clamping column is smaller than the size of the hollow cavity in the cover plate, and the top pin added in the lifting stage and retained on the side of the top of the guard wall during the installation stage serves as a sliding stopper.

[0023] The support rods at the top of the foundation pit during the excavation of the foundation pit to expose the old pipeline are at least partially retained in the foundation pit after the reinforcement process is completed. The sunshade nets laid on the support rods are retained at the interface between the backfill soil and the pit wall after the reinforcement process is completed.

[0024] The pipeline includes at least one or a combination of a gas pipeline, an electric power pipeline, a water supply pipeline, and a communication pipeline.

[0025] During the pouring of the retaining wall, HRB400 (3) grade steel bars are used as buried reinforcement, and a 20 mm protective layer is set on the surface of the reinforcement to prevent corrosion.

[0026] Wherein, filler particles with a negative thermal expansion coefficient are mixed in the fine sand. The volume mixing ratio of fine sand to filler is greater than or equal to 100:1 and less than or equal to 1000:1. Wherein, the material with a negative thermal expansion coefficient includes 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, B2O3.

[0027] The warning tape is a coating containing fluorescent powder or colored paint, which is used to indicate the buried depth of the pipeline protection structure, providing convenience for subsequent maintenance. Furthermore, the warning tape contains a pressure-sensitive element. When the upper pressure exceeds the preset threshold, an alarm is sent to a nearby controller via near-field communication (NFC) or Bluetooth communication, and the controller forwards the pressure alarm to the server.

[0028] The pipeline reinforcement system according to the embodiment of the present invention has the following advantages:

[0029] 1) Achieve non-stop operation to ensure that downstream users are not affected.

[0030] 2) Enhanced the mechanical properties of the protection corridor and more effectively protected the pipelines.

[0031] 3) Economical and reasonable, short implementation period, safe and reliable. It improves work efficiency and saves a lot of capital investment.

[0032] 4) Practice has proved that this technology can well meet the construction requirements of medium-high pressure gas pipeline reinforcement, overcome the shortcomings of traditional methods such as large investment, difficult construction, long construction period and many procedures, and can be used in other similar construction environments and conditions. It has good social and economic benefits and promotion and application benefits.

[0033] In summary, the pipeline reinforcement system according to the embodiment of the present invention increases the compressive strength of the pipeline, has good economic benefits, is simple and quick to construct, and does not affect normal road and bridge construction.

[0034] The objectives of the present invention, as well as other objectives not listed here, are met within the scope of the independent claims of the present application. Embodiments of the present invention are defined in the independent claims, and specific features are defined in the dependent claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The technical solution of the present invention is described in detail below with reference to the accompanying drawings, wherein:

[0036] Figure 1 A cross-sectional view of a pipeline reinforcement system according to an embodiment of the present invention is shown;

[0037] Figure 2 Shows Figure 1 An enlarged view of the connection between the cover plate and the retaining wall in the pipe reinforcement system shown in FIG; and

[0038] Figure 3 Shows Figure 1 Schematic diagrams of other embodiments of the retaining wall in the pipeline reinforcement system are shown in FIG. DETAILED DESCRIPTION

[0039] The features and technical effects of the technical solution of the present invention are described in detail below with reference to the accompanying drawings and in combination with illustrative embodiments, and a system is disclosed that can efficiently and inexpensively protect the air supply pipeline from damage by heavy-loaded vehicles. It should be noted that similar reference numerals represent similar structures, and the terms "first", "second", "upper", "lower", etc. used in this application can be used to modify various structures. These modifications do not imply the spatial, sequential or hierarchical relationship of the modified structures unless otherwise specified.

[0040] The road in this specification takes Jinsheng Expressway in Horqin New District, Inner Mongolia as an example. It starts from the intersection of Jinsheng Road and the planned North Ring Road of the New District in the south and ends at the intersection of Hohhot South Second Ring Road and Zhaowuda Road in the north. The total length of the route is about 20.297km. The road grade is urban expressway with a design speed of 80km / h. It is a two-way four-lane road. Most of the vehicles traveling on this road are heavy-loaded trucks with large traffic volume and heavy loads, which puts great pressure on the pipelines buried under the road. For this reason, according to the pipeline distribution plan, it is necessary to adopt the reinforcement system disclosed in this specification on a 1,300-meter section to strengthen the protection of the pipeline.

[0041] like Figure 1As shown, the pipeline reinforcement system according to the preferred embodiment of the present invention includes a foundation pit or a pipe trench, which is excavated from the road surface downward to expose the pipelines that have been buried in the early stage, including but not limited to gas pipelines, power pipelines, water supply pipelines, communication optical cable pipelines, etc. Taking the Jinsheng Road sub-high pressure gas pipeline as an example, the pipe trench within the protection range is excavated by manual or small excavators, and the excavation is carried out in sections, and the length of each section is not more than 50 meters, so as to balance the construction progress with environmental protection and traffic needs. The slope ratio of the pit wall of the foundation pit should ensure that the pipe groove and the pile of soil are stable and no landslide occurs. In a preferred embodiment, the slope ratio of the pit wall (for example, the ratio of the width difference between the top and bottom of the foundation pit to the height of the foundation pit) is preferably less than or equal to 1:1 to prevent landslides, but preferably greater than 1:0.8 to speed up the construction progress and reduce costs, and the best is 1:0.75. During the construction process, in order to avoid the natural gas pipeline from being exposed to the sun for a long time, it is preferred that a hard temporary support rod such as a steel pipe be used to support the black sunshade net when the excavation reaches the top of the pipe, that is, when the top of the pipe is exposed. After the subsequent reinforcement process is completed, at least a portion of these temporary support poles can be retained in the foundation pit to further enhance the compressive strength. Furthermore, after the sunshade is completed, 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 no additional adhesion reinforcement materials are required, thereby saving money.

[0042] When excavating downward to the designed elevation of the bottom of the cushion layer, the pipe is completely exposed at this time, and concrete with a commercial number of C20, for example, is poured from the side and bottom of the pipe to form a cushion layer, which is used to provide a high-quality base for the entire reinforcement system. The thickness of the cushion layer is, for example, greater than or equal to 50 mm, preferably greater than or equal to 70 mm, and optimally 100 mm. Preferably, at least a plurality of fixed anchors (not shown) are arranged on the bottom surface of the cushion layer, which are integrally formed with the cushion layer material, and the bottom size of the fixed anchor is larger than the top size, such as an inverted cone or claw shape, so as to improve the bonding strength between the cushion layer and the base soil layer at the bottom of the pit, and avoid the horizontal displacement of the reinforcement system caused by the unilateral heavy pressure from above.

[0043] Then, formwork is supported and concrete is poured on the cushion layer to form a Figure 1Multiple guard walls are shown, such as the guard wall A on the left and the guard wall B on the right. When the pipelines are multiple pipelines with a small spacing, only two guard walls A and B may be provided. When the pipelines are multiple pipelines with a large spacing or multiple pipelines of different types (such as a combination of at least two of gas, water supply, electricity, and communications), more guard walls may be provided to form more than two channels between adjacent guard walls. The environmental category of the guard wall component is Class IIb, and the component is made of C30 concrete. Preferably, along the extension direction of the pipeline (vertical to the paper plane), the length of the guard wall is less than or equal to 50 meters, preferably 40-10 meters, and preferably 20 meters. Temperature deformation joints are left between adjacent guard walls along the extension direction of the pipeline. The width of the joint is, for example, 20 mm. Asphalt hemp fibers or asphalt-coated wooden boards are filled between the joints to reduce the stress caused by the thermal expansion and contraction of the concrete guard walls. The height from the top to the bottom of the guard wall is usually more than 1 m, preferably 1.5 m, to provide sufficient accommodation space for the pipeline. As Figure 1 As shown in FIG. 1 , the guard wall is a convex shape, that is, it includes a narrower upper part and a wider lower part. Figure 3 As shown, the retaining wall may also have other morphologies, such as Figure 3 The three-level trapezoidal platform shown on the left, the single trapezoidal platform shown in the middle, and the three-level square platform shown on the right. In fact, as long as the upper width of the guard wall is smaller than the lower width (along the vertical pipeline extension direction), on the one hand, it improves the stability of the guard wall itself, and on the other hand, it gradually enhances the compressive strength to relieve the stress in the internal space. The non-smooth side wall can further improve the bonding strength with adjacent materials. During the pouring of the guard wall, the buried steel bars are HRB400 (3) grade steel bars, and a 20mm protective layer is set on the surface of the steel bars for corrosion prevention. The spacing between the bottom of the guard wall and the outside of the pipeline, and the spacing between the top of the guard wall and the top of the pipeline are both greater than or equal to 200mm to prevent accidental impact. In an embodiment of the present invention, the outer diameter of the pipeline is, for example, 350mm. Preferably, D508 anti-corrosion steel pipes are used to replace existing old pipelines to improve protection capabilities.

[0044] Then, the space surrounded by the two side walls is backfilled with fine sand to reduce the external vibration of the pipeline. The average particle size of the fine sand is less than or equal to 500 microns, preferably less than or equal to 200 microns, and optimally less than or equal to 100 microns. During the construction process, every 250-300 mm of backfill is compacted manually or with a small machine, and the compaction coefficient should be not less than 0.96. In a preferred embodiment, filler particles with a negative temperature expansion coefficient are also mixed in the fine sand. For example, the material with negative thermal expansion coefficient includes 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, B2O3. These fillers with negative thermal expansion coefficient can shrink and leave some gaps when the fine sand generates heat due to friction caused by long-term continuous heavy pressure or when exposed to high temperature in summer, thereby relieving the stress between the protective wall and the pipeline, and avoiding excessive pressure and overflow of fine sand or damage to the pipeline. The volume mixing ratio of fine sand to filler may be greater than or equal to 100:1 and less than or equal to 1000:1, preferably 300:1 to 500:1, and most preferably 400:1.

[0045] After the fine sand is backfilled until it is flush with the top of the retaining wall, the cover plate is hoisted to the top of the retaining wall and placed across. The cover plate is, for example, a 500mm wide and 200mm thick concrete reinforced (grade three steel ￠12 double-layer two-way @150) prefabricated cover plate, and the design load of the prefabricated cover plate is 50T. The top of the cover plate has a lifting ring or hook for connecting with the hook of the crane. It uses a steel bar with a diameter of 12mm. The anti-corrosion paint on the surface of the steel bar should use epoxy asphalt paint with a coating thickness of ≥200 microns. Preferably, the top of the cover plate also has a warning strip, such as a coating containing fluorescent powder or colored paint, which is used to indicate the buried depth of the pipeline protection structure to facilitate subsequent maintenance. More preferably, the warning strip contains a pressure-sensitive element. When the upper pressure exceeds the preset threshold, an alarm is sent to a nearby controller through near field communication (NFC), Bluetooth communication, etc., and the controller forwards the pressure alarm to the server, thereby reminding the road maintenance personnel to arrive at the site in time for processing or repair.

[0046] like Figure 2As shown, the top of the guard wall has an L-shaped fixing groove (or a space formed by a single-sided fixing protrusion and the top surface) for engaging with the top of the cover plate. Preferably, the lifting ring or hook on the top surface of the cover plate extends downward through the cover plate body and has a metal clamping column that is narrow at the top and wide at the bottom and is integrally formed therewith. The size of the clamping column is slightly smaller than the size of the cavity in the cover plate, and the top pin that is added during the lifting stage and can be retained on the side of the top of the guard wall during the installation stage is used as a sliding stopper. The top of the guard wall has a clamping groove that matches the clamping column, thereby effectively preventing the cover plate from sliding in translation.

[0047] After the cover is installed, backfill the foundation pit. Preferably, the backfill is divided into at least two layers, the lower layer is 1m thick, compacted by manual or small machinery, and the total equivalent weight applied shall not be greater than 2T, otherwise the safety of the natural gas pipeline during construction cannot be guaranteed; the thickness of the upper layer is selected according to the road surface conditions, and can include various gravel, soil or asphalt, etc., with a total thickness ranging from 50 to 1000mm.

[0048] Finally, the road pavement construction continues on top of the backfill soil, which can be either a cement pavement or an asphalt pavement.

[0049] The pipeline reinforcement system according to the embodiment of the present invention increases the compressive strength of the pipeline, has good economic benefits, is simple and quick to construct, and does not affect normal road and bridge construction.

[0050] Although the present invention has been described with reference to one or more exemplary embodiments, those skilled in the art will appreciate that various suitable changes and equivalents may be made to the system structure without departing from the scope of the present invention. In addition, many modifications that may be suitable for specific situations or materials may be made from the disclosed teachings without departing from the scope of the present invention. Therefore, the purpose of the present invention is not to be limited to the specific embodiments disclosed as the best mode for implementing the present invention, and the disclosed system structure and its manufacturing method will include all embodiments that fall within the scope of the present invention.

Claims

1. A pipeline reinforcement system, comprising: A foundation pit is located below the road surface and has an inclined pit wall, 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; The cushion layer is located at the bottom of the foundation pit; a plurality of retaining walls, located on the cushion layer; A cover plate is located on the plurality of guard walls, and each two adjacent guard walls and the cover plate in the horizontal direction along which the vertical pipeline extends form a receiving space; A pipeline is located in the accommodation space; There is backfill sand in the accommodation space, and the backfill sand is composed of fine sand and filler particles, and the average particle size of the fine sand of the backfill sand is less than or equal to 500 microns; during the construction process, each backfill of 250-300mm of the fine sand of the backfill sand needs to be compacted manually or with a small machine, and the compaction coefficient should be not less than 0.

96. The backfill sand is divided into multiple layers that are compacted layer by layer, and the thickness of each layer is 250 to 300 mm; There is backfill soil between the foundation pit and the retaining wall and the cover plate. The fine sand is mixed with filler particles with a negative temperature expansion coefficient. The volume mixing ratio of the fine sand and the filler particles in the backfill sand is greater than or equal to 100:1 and less than or equal to 1000:

1.

2. The pipeline reinforcement system according to claim 1, wherein: Temperature deformation joints are left between adjacent retaining walls.

3. The pipeline reinforcement system according to claim 1, wherein: The top width of the retaining wall is smaller than the bottom width.

4. The pipeline reinforcement system according to claim 1, wherein: The cushion layer and retaining wall are both formed by pouring concrete, and the cover plate is a prefabricated steel-concrete part.

5. The pipeline reinforcement system according to claim 4, wherein: The thickness of the cushion layer is greater than or equal to 50 mm, the height of the protective wall is greater than or equal to 1 meter, and the length along the extension direction of the pipeline is less than or equal to 50 meters.

6. The pipeline reinforcement system according to claim 1, wherein: The distance between the pipe and the retaining wall is greater than or equal to 200 mm.

7. The pipeline reinforcement system according to claim 1, wherein: There are lifting rings on both sides of the top of the cover plate, and a warning tape in the middle of the top of the cover plate.

8. The pipeline reinforcement system according to claim 1, wherein: The backfill is divided into at least two sides, with the bottom layer being a compacted coating of 1 meter thickness and the upper layers varying in thickness from 50 to 1000 mm.

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