Construction method of segmental foam concrete

Abstract

The invention provides a construction method of segmental foam concrete, which is applied to the technical field of building construction, and provides a stable frame structure for subsequent foam concrete pouring by firstly constructing a lateral reinforced concrete plate and a horizontal support at a to-be-treated part. And then a segmental foam concrete pouring method is adopted, pushing is conducted from the two ends of the tunnel to the center at the same time, the construction efficiency is improved, and deformation of the pipeline can be effectively controlled. The method solves the problems that traditional sandbag back pressure construction is low in efficiency and poor in deformation control effect, meanwhile, the method adapts to the characteristics that the in-service oil and gas pipeline construction space is limited and gas continuous construction is needed, and the method has the beneficial effects that the construction efficiency is improved, the safety risk is reduced, the pipeline stress uniformity is improved, and the method adapts to the in-service oil and gas pipeline construction conditions.

Description

Technical Field

[0001] The present application relates to the technical field of building construction, and in particular to a construction method of segmental foam concrete. Background Art

[0002] Oil and gas pipelines are important energy infrastructure that serve as the main carriers for transporting oil, natural gas and other products, and at the same time promote national economic development and social progress. According to incomplete statistics, by the end of 2023, the total mileage of my country's long-distance oil and gas pipelines will reach 183,000 kilometers, and an oil and gas network that spans the east and west, runs north and south, covers the entire country, and connects overseas has basically been formed. As a typical linear structure, the terrain and geological conditions that oil and gas pipelines cross are highly variable. During long-term operation, affected by factors such as transportation pressure, thermal expansion and melting, environmental corrosion, and geological activities, the pipelines will inevitably have excessive local deformations, resulting in local stress concentration in the pipelines, leading to diseases such as bulges and hollowing out. In severe cases, they may even cause pipeline leaks or explosions. At present, the sandbag back pressure method is commonly used to treat existing oil and gas pipeline defects. By increasing the overburden load on the pipeline and the interface friction between the sandbag and the pipeline, the vertical floating deformation and lateral swing deformation of the pipeline can be controlled. However, the treatment of in-service oil and gas pipeline defects often faces difficulties such as tight construction period, limited working space, and the need for continuous gas construction. Due to the narrow construction space, the sandbag back pressure construction needs to be carried by manpower, which has high labor costs, extremely low construction efficiency and high construction risks. In addition, due to the need for stacked sandbags to stabilize themselves, the sandbags from top to bottom must have a slope, which leads to uneven force along the lateral direction of the pipeline during back pressure construction. In the long run, the pipeline is prone to biased deformation and damage.

[0003] Therefore, in order to treat the deformation of in-service oil and gas pipelines, a treatment method with high construction efficiency, good deformation control effect and low requirements on the construction environment is urgently needed. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present application provides a construction method of segmented foam concrete, which is applied to the field of building construction technology and has the advantages of improving construction efficiency, reducing safety risks, improving pipeline force uniformity, and adapting to the construction conditions of in-service oil and gas pipelines.

[0005] In a first aspect, a construction method of segmental foam concrete is applied to an in-service oil and gas pipeline, the method comprising the steps of: S1: Obtain the part of the in-service oil and gas pipeline to be treated; S2: constructing a lateral reinforced concrete slab at the location to be treated; S3: After the lateral reinforced concrete slab is constructed, horizontal support construction is performed; S4: After the horizontal support construction is completed, the foam concrete pouring construction is carried out section by section from the tunnel openings at both ends to the center of the tunnel simultaneously until the foam concrete pouring of all the parts to be treated is completed.

[0006] The present application provides a construction method of segmented foam concrete, which is applied to in-service oil and gas pipelines. This technical solution provides a stable frame structure for the subsequent foam concrete pouring by first constructing lateral reinforced concrete slabs and horizontal supports (4) at the site to be treated. Then, a segmented foam concrete pouring method is adopted to advance from both ends of the tunnel to the center at the same time, which not only improves the construction efficiency but also effectively controls the deformation of the pipeline. This method solves the problems of low efficiency and poor deformation control effect of traditional sandbag back pressure construction. At the same time, it also adapts to the characteristics of in-service oil and gas pipeline construction space being limited and requiring continuous gas construction. It has the beneficial effects of improving construction efficiency, reducing safety risks, improving pipeline force uniformity, and adapting to the construction conditions of in-service oil and gas pipelines.

[0007] Furthermore, in step S2, the reinforced concrete slab is a cast-in-place or prefabricated reinforced concrete slab, and the slab thickness is not less than 15 cm.

[0008] The present application provides a construction method of segmented foam concrete, which solves the specification and strength problems of reinforced concrete slabs by specifying the manufacturing method and minimum thickness of reinforced concrete slabs. This design ensures both the flexibility of construction and the stability and safety of the structure. By using cast-in-place or prefabricated reinforced concrete slabs with a thickness of not less than 15 cm, effective lateral support and protection can be provided for in-service oil and gas pipelines, thereby improving the reliability and applicability of the entire construction method.

[0009] Furthermore, in step S3, the installation height of the horizontal support is 1 / 2 to 3 / 4 of the height of the reinforced concrete slab.

[0010] The present application provides a construction method for segmented foam concrete. By controlling the installation height of the horizontal support, the force distribution of the pipeline reinforcement structure can be optimized, the stability and reliability of the overall construction can be improved, and strong support can be provided for subsequent foam concrete pouring.

[0011] Further, in step S3, the horizontal support is one or more of an I-beam, a steel pipe, an angle steel, and a square steel, and the length of the horizontal support is not less than 0.8 m.

[0012] The present application provides a construction method for segmented foam concrete, which solves the technical problem of horizontal support installation by specifying the material selection and minimum length requirements of the horizontal support. This design allows flexible selection of support materials according to actual conditions, while ensuring that the support structure has sufficient length to provide the necessary stability and bearing capacity. This method not only improves the flexibility and adaptability of construction, but also ensures the stability and safety of the entire structure, creating favorable conditions for subsequent foam concrete pouring construction.

[0013] Furthermore, the in-service oil and gas pipeline is arranged in a tunnel lining structure. In step S3, the horizontal support is connected to the reinforced concrete slab and the tunnel lining structure by bolts.

[0014] Furthermore, in step S4, the pouring volume of the foamed concrete is not higher than 400 cubic meters.

[0015] Furthermore, in step S4, the thickness of the protective layer of the foamed concrete on the top surface and the side surface facing the in-service oil and gas pipeline is not less than 20 cm.

[0016] Furthermore, in step S4, the dry density grade of the foamed concrete is A08-A12, and the strength grade is C3-C10.

[0017] Furthermore, after step S4, the method further comprises: S5: Sprinkle water on the poured foam concrete for maintenance.

[0018] Furthermore, the grade of the reinforced concrete slab is C15~C25.

[0019] Beneficial effects: The present application provides a method for the construction of segmented foam concrete, which is applied to in-service oil and gas pipelines. This technical solution provides a stable frame structure for the subsequent pouring of foam concrete by first constructing lateral reinforced concrete slabs and horizontal supports at the site to be treated. Then, a segmented foam concrete pouring method is adopted to advance from both ends of the tunnel to the center at the same time, which not only improves the construction efficiency, but also effectively controls the deformation of the pipeline. This method solves the problems of low efficiency and poor deformation control effect of traditional sandbag back-pressure construction. At the same time, it also adapts to the characteristics of in-service oil and gas pipeline construction space being limited and requiring continuous gas construction. It has the beneficial effects of improving construction efficiency, reducing safety risks, improving pipeline force uniformity, and adapting to the construction conditions of in-service oil and gas pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A flow chart of a construction method of segmented foam concrete provided in this application.

[0021] Figure 2A structural schematic diagram of a segmental foam concrete construction method provided in this application applied to an in-service oil and gas pipeline.

[0022] Explanation of numbers: 1. Tunnel lining structure; 2. In-service oil and gas pipeline; 3. Reinforced concrete slab; 4. Horizontal support; 5. Foam concrete. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application usually described and marked in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0024] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0025] The following disclosure provides many different implementations or examples for achieving the purpose of the present invention, which solve the problems in the prior art that the stator installation accuracy of the linear motor cannot be adjusted and the installation, detection and adjustment processes are inefficient.

[0026] For details, please refer to Figure 1 to Figure 2 In a first aspect, a construction method of segmental foam concrete 5 is applied to an in-service oil and gas pipeline 2, the method comprising the steps of: S1: Obtain the part to be treated of the in-service oil and gas pipeline 2; S2: Construction of lateral reinforced concrete slab 3 at the part to be treated; S3: After the lateral reinforced concrete slab 3 is constructed, the horizontal support 4 is constructed; S4: After the construction of the horizontal support 4 is completed, the foam concrete 5 is poured section by section from the tunnel openings at both ends to the center of the tunnel simultaneously until the foam concrete 5 pouring of all the parts to be treated is completed.

[0027] Among them, in the process of treating the defects of the in-service oil and gas pipeline 2, the sandbag back pressure method is generally used to control the vertical floating deformation and lateral swing deformation of the pipeline. However, this method has many technical difficulties in practical application. The primary problem is the low construction efficiency. Due to the narrow construction space, the sandbag back pressure construction mainly relies on manual handling, which not only leads to high labor costs, but also greatly reduces the construction efficiency. Secondly, the deformation control effect is not ideal. The stacking of sandbags needs to maintain a certain slope to ensure its own stability, which leads to uneven force along the lateral direction of the pipeline, which may cause pipeline bias deformation and damage in the long run. In addition, the treatment of defects in the in-service oil and gas pipeline 2 also faces technical challenges such as tight construction period, limited working space, and the need for continuous gas construction, which further increases the difficulty and risk of construction.

[0028] In view of the problems of low construction efficiency and poor deformation control effect in the treatment of defects in in-service oil and gas pipelines 2, this application proposes to use foamed concrete 5 to replace traditional concrete and sandbags. Foamed concrete 5 has the characteristics of light weight, good fluidity, and adjustable strength, and is more suitable for construction in a small space. However, there are still construction risks in directly using the integral casting method, and the construction process needs to be further optimized.

[0029] To ensure construction safety and quality control, the present application first constructs a lateral reinforced concrete slab 3 at the location to be treated to establish a stable support structure; then adds horizontal supports 4 to form a reliable frame system; and finally adopts a segmented foam concrete 5 pouring process to advance from both ends to the center, thereby achieving uniform and controllable support for the pipeline.

[0030] Among them, in step S1, the part to be treated refers to the specific area in the in-service oil and gas pipeline 2 that needs to be treated for defects. Specifically, the deformation and defect conditions of the in-service oil and gas pipeline 2 in the tunnel can be investigated and the pipeline stress can be checked to identify the bulge, hollow deformation and stress concentration parts of the pipeline as the parts to be treated.

[0031] Wherein, in step S2, the lateral reinforced concrete slab 3 refers to a reinforced concrete structure installed on both sides of the part to be treated, which can be realized by cast-in-place or prefabrication.

[0032] Among them, in step S3, the horizontal support 4 refers to a transverse structural member installed between the reinforced concrete slab 3 and the tunnel lining structure 1, and can be implemented by materials such as I-beams, steel pipes, angle steels or square steels.

[0033] Among them, in step S4, the segmental foam concrete 5 pouring refers to dividing the part to be treated into several segments, and performing the foam concrete 5 pouring construction segment by segment, which can be specifically achieved by using foam concrete 5 pouring equipment.

[0034] This application solves the problems of construction efficiency and deformation control in the treatment of defects in in-service oil and gas pipelines 2 through a step-by-step and area-by-area construction plan. The method first establishes a stable support structure at the site to be treated, and then adopts a segmental foam concrete 5 pouring process to achieve uniform and controllable support for the pipeline. The specific construction principle is: First, by obtaining the parts to be treated, determine the specific area that needs to be treated. This step can be completed through methods such as on-site surveys and pipeline inspections to accurately locate the location and scope of the disease.

[0035] Next, the lateral reinforced concrete slab 3 is constructed at the part to be treated. The reinforced concrete slab 3 can be cast in situ or prefabricated and installed on one side of the part to be treated. These slab structures provide stable lateral support to prevent lateral deformation during the subsequent pouring of foamed concrete 5.

[0036] After the construction of the lateral reinforced concrete slab 3 is completed, the horizontal support 4 is constructed. The horizontal support 4 can be made of materials such as I-beams, steel pipes, angle steels or square steels, and is installed between the reinforced concrete slab 3 and the tunnel lining structure 1. This step further enhances the stability of the overall structure and prevents vertical deformation during the pouring of the foamed concrete 5.

[0037] Finally, the foam concrete 5 is poured segment by segment from the tunnel openings at both ends to the center of the tunnel. This method of advancing from both ends to the center ensures the uniformity and symmetry of the overall construction, which is conducive to controlling the overall deformation of the pipeline. The segmental pouring method not only improves the construction efficiency, but also makes it easier to control the quality of each segment.

[0038] The components and steps work together to form a complete support system. The lateral reinforced concrete slab 3 and the horizontal support 4 form a stable frame structure, providing a reliable foundation for the pouring of foam concrete 5. The segmental foam concrete 5 pouring fills the support material in this frame to achieve uniform and controllable support for the pipe.

[0039] The selection of foamed concrete 5 as the main supporting material is based on its light weight, good fluidity, adjustable strength and other characteristics, which makes it more suitable for construction in a small space. The segmental casting method is selected to ensure construction safety and quality control, while improving construction efficiency.

[0040] Furthermore, in step S2, the reinforced concrete slab 3 is a cast-in-place or prefabricated reinforced concrete slab 3, and the slab thickness is not less than 15 cm.

[0041] Among them, the technical solution of the present application involves the manufacturing method and thickness specification of the reinforced concrete slab 3. Specifically, the reinforced concrete slab 3 can be manufactured by cast-in-place or prefabrication, and the requirement that the slab thickness is not less than 15 cm is stipulated. This design aims to solve the specification and strength problems of the reinforced concrete slab 3 and provide effective lateral support and protection for the in-service oil and gas pipeline 2.

[0042] This application solves the specification and strength issues of the reinforced concrete slab 3 by stipulating the manufacturing method and minimum thickness of the reinforced concrete slab 3. The cast-in-place or prefabricated manufacturing method provides flexibility for construction, and the appropriate manufacturing method can be selected according to the actual situation. For example, if the construction conditions permit, on-site casting can be selected to ensure that the reinforced concrete slab 3 fits perfectly with the on-site environment; and if the construction conditions are limited or the construction progress needs to be accelerated, prefabricated reinforced concrete slabs 3 can be selected to improve construction efficiency.

[0043] The slab thickness of not less than 15 cm ensures that the reinforced concrete slab 3 has sufficient strength and rigidity to provide sufficient support without excessively increasing the deadweight of the structure. Specifically, the thickness of 15 cm allows sufficient steel bar cover thickness while providing sufficient concrete cross-sectional area to withstand lateral pressure.

[0044] The technical solution of the present application has obvious advantages over the prior art. The traditional sandbag counter-pressure method has problems such as low construction efficiency, high labor cost, and high safety risk. The reinforced concrete slab 3 solution proposed in the present application greatly improves the construction efficiency, reduces labor cost and safety risk by means of cast-in-place or prefabrication. At the same time, the uniform stress characteristics of the reinforced concrete slab 3 avoid the problem of uneven stress caused by the stacking of sandbags, and effectively prevents the biased deformation of the pipeline.

[0045] Furthermore, in step S3 , the installation height of the horizontal support 4 is 1 / 2 to 3 / 4 of the height of the reinforced concrete slab 3 .

[0046] Among them, by setting the horizontal support 4 in the upper area between the reinforced concrete slab 3 and the tunnel lining structure 1, the middle and upper parts of the reinforced concrete slab 3 can be effectively supported, so that the support point is in a relatively stable position. When the horizontal support 4 is installed at 1 / 2 of the slab height, it can provide basic support; when installed at 3 / 4, the deformation of the upper part of the slab can be better controlled. The selection of this height range makes the support structure more evenly stressed, avoiding poor support effects caused by too low a support point, or local stress concentration caused by too high a support point.

[0047] During specific implementation, the horizontal support 4 can be in various forms such as I-beams and steel pipes. The connection between the support and the reinforced concrete slab 3 is fixed with bolts to ensure the reliability of the connection. The support spacing is reasonably arranged according to the actual engineering needs, and it is generally recommended that the spacing is not more than 2 meters to ensure the support effect. For example, when the slab height is 60 cm, the support installation height can be set within the range of 30-45 cm. Compared with the traditional method of arbitrarily determining the support height, this application solves the technical problems such as uneven force and poor stability of the support structure by scientifically setting the installation height of the horizontal support 4, creating good conditions for the pouring construction of the foam concrete 5.

[0048] Further, in step S3, the horizontal support 4 is one or more of an I-beam, a steel pipe, an angle steel, and a square steel, and the length of the horizontal support 4 is not less than 0.8 m.

[0049] Among them, the horizontal support 4 of the present application can be selected from one or more of I-beam, steel pipe, angle steel, square steel. This diverse material selection provides flexibility for different construction environments and requirements, and the most suitable support material can be selected according to the specific situation. The length of the horizontal support 4 is not less than 0.8m. This minimum length requirement ensures the stability and bearing capacity of the support structure, and provides reliable support for the subsequent pouring of foam concrete 5.

[0050] Specifically, the material selection of the horizontal support 4 of the present application can be flexibly adjusted according to the actual construction needs. For example, when a higher bearing capacity is required, an I-beam can be selected as the material of the horizontal support 4. The I-beam has high bending strength and rigidity, and can effectively withstand the pressure during the pouring of the foam concrete 5. In a construction environment where the space is relatively narrow, a steel pipe can be selected as the material of the horizontal support 4. The steel pipe has a smaller cross-sectional area and can maximize the use of limited space. For situations that require quick installation and disassembly, angle steel or square steel can be selected as the material of the horizontal support 4. These materials are easy to process and connect, which can improve construction efficiency.

[0051] Furthermore, the design of the horizontal support 4 being not less than 0.8 m takes into account the stability and bearing capacity of the support structure. A longer support length can provide a larger support area, thereby more evenly dispersing the pressure generated during the pouring of the foam concrete 5. At the same time, this minimum length requirement also takes into account the operability of actual construction, ensuring that construction personnel can easily install and adjust the horizontal support 4.

[0052] Therefore, the technical solution of the present application effectively solves the technical problem of installing the horizontal support 4 by specifying the material selection and minimum length requirements of the horizontal support 4. This design allows flexible selection of support materials according to actual conditions, while ensuring that the support structure has sufficient length to provide the necessary stability and bearing capacity. This method not only improves the flexibility and adaptability of construction, but also ensures the stability and safety of the entire structure, creating favorable conditions for the subsequent pouring of foam concrete 5.

[0053] Furthermore, the in-service oil and gas pipeline 2 is arranged in the tunnel lining structure 1. In step S3, the horizontal support 4 is connected to the reinforced concrete slab 3 and the tunnel lining structure 1 by bolts.

[0054] The horizontal support 4 is an important part of the construction method of the segmental foam concrete 5, and its function is to provide additional support for the reinforced concrete slab 3 and enhance the stability of the overall structure. Through the bolt connection method, a firm connection between the horizontal support 4 and the reinforced concrete slab 3 and the tunnel lining structure 1 can be achieved.

[0055] This connection method has the advantages of improving connection strength, facilitating installation and disassembly, strong adaptability, and reducing structural damage. By adopting the bolt connection method, the connection problem between the horizontal support 4 and the reinforced concrete slab 3 and the tunnel lining structure 1 can be effectively solved, ensuring the stability and safety of the entire segmental foam concrete 5 construction system. This connection method provides a reliable technical support for the treatment of defects in the in-service oil and gas pipeline 2.

[0056] Specifically, the present application adopts a bolt connection method to connect the horizontal support 4 with the reinforced concrete slab 3 and the tunnel lining structure 1. Among them, the tunnel lining structure 1 is a cast-in-place or prefabricated reinforced concrete structure in the tunnel, which is used to accommodate in-service oil and gas pipelines and provide support and protection. The connection method between the horizontal support 4 and the reinforced concrete slab 3 and the tunnel lining structure 1 can be achieved in a variety of ways, such as: Embedded bolts: pre-embed bolts in the reinforced concrete slab 3 and the tunnel lining structure 1, and then fix the horizontal support 4 on these embedded bolts; or expansion bolts: drill holes in the reinforced concrete slab 3 and the tunnel lining structure 1, and then use expansion bolts to fix the horizontal support 4; or chemical bolts: drill holes in the reinforced concrete slab 3 and the tunnel lining structure 1, and use a combination of chemical anchors and bolts to fix the horizontal support 4.

[0057] These connection methods can be selected according to actual construction conditions and requirements. For example, embedded bolts can be used in new structures, while expansion bolts or chemical bolts may be more suitable for existing structures.

[0058] The bolt connection method has a synergistic effect with the design of the horizontal support 4 and the reinforced concrete slab 3. The installation height of the horizontal support 4 is 1 / 2 to 3 / 4 of the height of the reinforced concrete slab 3. This design, combined with the bolt connection, can better disperse the force and improve the stability of the overall structure. At the same time, the adjustability of the bolt connection also makes the installation of the horizontal support 4 more flexible and can adapt to different construction environments and requirements.

[0059] Furthermore, in step S4, the pouring volume of the foamed concrete 5 is not higher than 400 cubic meters.

[0060] The volume control problem in the construction process is solved by limiting the pouring volume of the foamed concrete 5. Specifically, limiting the single pouring volume to no more than 400 cubic meters can effectively control the construction scale and facilitate management and quality control.

[0061] This technical solution can effectively solve the problems that may be caused by large-volume pouring by limiting the maximum pouring volume of foam concrete 5. First, controlling the pouring volume can reduce the internal temperature stress of concrete and reduce the risk of cracking. Secondly, pouring in batches is conducive to ensuring the uniformity and density of concrete and improving the construction quality. Furthermore, the smaller pouring volume is convenient for on-site management and construction control, which can better ensure the construction progress and quality. Finally, this segmented pouring method is also conducive to the maintenance of concrete and the later quality inspection.

[0062] By adopting this segmental foam concrete 5 pouring method, not only the construction efficiency can be improved, but also the construction quality can be ensured, providing a reliable technical solution for the treatment of defects in the in-service oil and gas pipeline 2.

[0063] Furthermore, in step S4, the thickness of the protective layer of the foamed concrete 5 on the top surface and the side surface facing the in-service oil and gas pipeline 2 is not less than 20 cm.

[0064] Among them, this technical solution solves the problem of protecting the in-service oil and gas pipeline 2 during the pouring of the foamed concrete 5 by ensuring that the thickness of the protective layer on the top and side surfaces of the in-service oil and gas pipeline 2 is not less than 20 cm during the pouring of the foamed concrete 5. Specifically, this technical feature plays a key role in solving the problem of protecting the in-service oil and gas pipeline 2: The thickness of the protective layer refers to the minimum thickness of the foamed concrete 5 on the surface of the in-service oil and gas pipeline 2. The thickness of the protective layer is not less than 20 cm to prevent the foamed concrete 5 from being too thin, which may cause cracks or other damage to the foamed concrete 5 during normal operation of the in-service oil and gas pipeline 2. The thickness of the protective layer is to prevent the in-service oil and gas pipeline 2 from vibrating during the construction period, which may damage the foamed concrete 5 structure, and to prevent the foamed concrete 5 in contact with the in-service oil and gas pipeline 2 from cracking or even falling off due to the thin thickness, which may affect the operation safety of the in-service oil and gas pipeline 2.

[0065] By providing such a protective layer, the solution can effectively protect the safety and integrity of the in-service oil and gas pipeline 2 while carrying out the pouring construction of the foam concrete 5, reduce the potential damage to the pipeline during the construction process, and thus ensure the normal operation of the oil and gas pipeline during and after the treatment.

[0066] In the present application, the thickness of the protective layer is set to be no less than 20 cm. This thickness can be adjusted according to specific circumstances. For example, for pipes with larger diameters or pipes subjected to higher pressures, the thickness of the protective layer can be appropriately increased to 25 cm or 30 cm.

[0067] In the actual construction process, the layered pouring method can be used to ensure the uniformity of the protective layer. For example, a 10cm thick protective layer is poured first, and the remaining part is poured after it is initially set. This can better control the quality and thickness of the protective layer. In addition, fiber materials or lightweight aggregates can be added to the protective layer to enhance its crack resistance and reduce its weight.

[0068] Furthermore, in step S4, the dry density grade of the foamed concrete 5 is A08-A12, and the strength grade is C3-C10.

[0069] Among them, the dry density and strength of the foam concrete 5 are key parameters affecting its performance. The dry density range corresponding to the dry density grade A08~A12 is between 800-1200kg / m³, which can ensure that the material has good lightness and thermal insulation properties, and can also ensure sufficient structural strength. The compressive strength range corresponding to the strength grade C3~C10 is between 3-10MPa, which can provide sufficient protection and support for the in-service oil and gas pipeline 2.

[0070] In specific implementation, the appropriate dry density and strength grade can be selected within the above range according to the actual project requirements. For example, when the pipeline is buried at a shallow depth, a higher strength grade can be selected to provide better protection; when the pipeline load needs to be reduced, a lower dry density grade can be selected. The target performance indicators can be achieved by adjusting the process parameters such as the mix ratio and foaming ratio.

[0071] Furthermore, after step S4, the method further comprises: S5: Sprinkling water on the poured foamed concrete 5 for curing.

[0072] Among them, the watering curing step proposed in this application can be implemented in a variety of ways. For example, manual watering, automatic sprinkler system or mobile watering device can be used for curing. The frequency and duration of watering can be adjusted according to the specific situation. Usually, watering can be carried out 2-3 times a day within the first 7 days after pouring, each time lasting 15 to 30 minutes. When watering, attention should be paid to the control of water volume to avoid excessive water from washing the surface of the foam concrete 5.

[0073] Sprinkling curing forms a good coordination relationship with the above steps. The lateral reinforced concrete slab 3 and the horizontal support 4 provide a stable structural support for the foamed concrete 5. The segment-by-segment pouring ensures the construction quality, while sprinkling curing further improves the strength and durability of the foamed concrete 5. This coordination not only solves the maintenance problem of the foamed concrete 5, but also improves the stability and durability of the overall structure.

[0074] Furthermore, the grade of the reinforced concrete slab 3 is C15~C25.

[0075] Among them, the present application solves the problem of insufficient strength of the reinforced concrete slab 3 by clearly specifying the strength grade range of the reinforced concrete slab 3. The strength grade of C15~C25 ensures sufficient structural strength while providing flexibility for selection according to specific engineering requirements. This can not only effectively support the foam concrete 5, but also work in conjunction with other steps such as horizontal support 4 and foam concrete 5 pouring, thereby achieving comprehensive protection and stabilization of the in-service oil and gas pipeline 2.

[0076] Specifically, reinforced concrete slabs 3 are a key component in the segmental foam concrete 5 construction method, which is used to provide lateral support in the area to be treated. The strength grade range of C15 to C25 can provide sufficient structural strength while maintaining a certain economy. The C15 grade provides basic strength, while C25 provides higher strength for different engineering needs. By specifying the strength grade range of C15 to C25, the method allows the appropriate concrete strength to be selected according to specific engineering needs. This flexibility helps optimize cost and performance.

[0077] The above description is only an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

Claims

1. A construction method of segmental foam concrete, characterized in that: Applied to an in-service oil and gas pipeline (2), the method comprises the steps of: S1: obtaining the part of the in-service oil and gas pipeline (2) to be treated; S2: constructing a lateral reinforced concrete slab (3) at the location to be treated; S3: After the construction of the lateral reinforced concrete slab (3) is completed, the horizontal support (4) is constructed; S4: After the construction of the horizontal support (4) is completed, the foam concrete (5) is poured section by section from the tunnel openings at both ends to the center of the tunnel simultaneously until the foam concrete (5) is poured in all the parts to be treated.

2. A construction method of segmental foam concrete according to claim 1, characterized in that: In step S2, the reinforced concrete slab (3) is a cast-in-place or prefabricated reinforced concrete slab (3), and the slab thickness is not less than 15 cm.

3. The construction method of segmental foam concrete according to claim 1, characterized in that: In step S3, the installation height of the horizontal support (4) is 1 / 2 to 3 / 4 of the height of the reinforced concrete slab (3).

4. The construction method of segmental foam concrete according to claim 3, characterized in that: In step S3, the horizontal support (4) is one or more of an I-beam, a steel pipe, an angle steel, and a square steel, and the length of the horizontal support (4) is not less than 0.8 m.

5. The construction method of segmental foam concrete according to claim 1, characterized in that: The in-service oil and gas pipeline (2) is arranged in the tunnel lining structure (1). In step S3, the horizontal support (4) is connected to the reinforced concrete slab (3) and the tunnel lining structure (1) by bolts.

6. The construction method of segmental foam concrete according to claim 1, characterized in that: In step S4, the pouring volume of the foamed concrete (5) is not higher than 400 cubic meters.

7. The construction method of segmental foam concrete according to claim 1, characterized in that: In step S4, the protective layer thickness of the foamed concrete (5) on the top surface and the side surface facing the in-service oil and gas pipeline (2) is not less than 20 cm.

8. The construction method of segmental foam concrete according to claim 1, characterized in that: In step S4, the dry density grade of the foamed concrete (5) is A08-A12, and the strength grade is C3-C10.

9. The construction method of segmental foam concrete according to claim 1, characterized in that: After step S4, the following steps are included: S5: Sprinkling water on the poured foamed concrete (5) for curing.

10. The construction method of segmental foam concrete according to claim 2, characterized in that: The grade of the reinforced concrete slab (3) is C15-C25.

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