Construction device and construction method for encapsulating concrete in buried shallow-buried pipeline

Abstract

The invention discloses a construction device and a construction method for encapsulating concrete in a buried shallow-buried pipeline. The construction device comprises guide rails, a slip form trolley, a lifting assembly, a slip form assembly and two guide rails, wherein the two guide rails are arranged in the longitudinal direction of the pipeline; the slip form trolley comprises a frame body and a plurality of tires; the lifting assembly is arranged on the trolley frame body; the sliding formwork assembly comprises a feeding hopper, a storage bin, a shaping formwork, a mechanical vibrating device and a concrete shaping piece. Concrete enters from the feeding hopper, falls into the storage bin and then diffuses towards the shaping formwork, the attached vibrorammer is started to enable the concrete to be compact and formed, and the walking motor on the trolley is started to drive the sliding formwork trolley and the sliding formwork assembly to move forwards on the guide rail in the longitudinal direction of the pipeline. In this way, the upper portion of the pipeline is continuously poured with the encapsulated concrete, and one-time forming is achieved.

Description

Technical Field

[0001] This invention relates to the field of engineering construction technology, and in particular to a concrete encapsulation device and construction method for buried shallow pipelines. Background Technology

[0002] Shallow buried pipelines mainly refer to pipelines installed below ground level, with shallow burial depth, insufficient soil cover, or located in high-load areas or sensitive areas. These include precast concrete pipes, fiberglass reinforced plastic (FRP) pipes, polyurethane pipes, and corrugated metal pipes.

[0003] During pipeline operation, protective sleeves are typically installed for safety reasons. Among existing pipeline protection measures, cast-in-place concrete encapsulation technology can improve the safety and durability of shallow-buried pipelines by dispersing loads, restraining deformation, and isolating corrosion through a rigid protective layer. It is an effective solution for pipeline protection under special working conditions.

[0004] When constructing a concrete enclosure for shallow-buried pipelines, it is generally necessary to pour concrete (the first pour is for the portion below the pipeline centerline) more than twice to complete the entire process. During the second pour, the concrete needs to enclose the upper semi-circular section of the pipeline. Often, due to a lack of molds, the concrete cannot be properly shaped, or the construction workers do not pay attention to quality control, which can easily lead to unstable construction quality of the enclosure concrete. This can cause pain points and difficulties such as safety hazards during later use, and in severe cases, rework can be required, thus delaying the construction period. Summary of the Invention

[0005] The purpose of this invention is to provide a concrete encapsulation device and construction method for buried shallow pipelines, so as to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0006] The technical solution adopted to solve the above-mentioned technical problems is as follows:

[0007] This invention provides a concrete encapsulation construction device for buried shallow pipelines, including guide rails, a sliding formwork trolley, a lifting assembly, and a sliding formwork assembly. Two guide rails are arranged longitudinally with respect to the pipeline. The sliding formwork trolley includes a frame and multiple tires, which are rotatably mounted on the bottom of the frame and slidably mounted on the two longitudinally arranged guide rails. The lifting assembly is mounted on the trolley frame. The sliding formwork assembly includes a feeding hopper, a storage bin, a shaping mold, a mechanical vibrator, and a concrete shaping component. The shaping mold is mounted on the lifting assembly, and a concrete shaping component is mounted on the bottom of the shaping mold. The mechanical vibrator and the storage bin are located on the shaping mold. The feeding hopper is located at the inlet of the storage bin, and the concrete shaping component is connected to the outlet of the storage bin. The concrete shaping component includes a shaping plate with a semi-circular cross-section.

[0008] The beneficial effects of this invention are:

[0009] Concrete enters from the feed hopper, falls into the storage bin, and then spreads towards the forming mold. The attached vibrator is activated to compact and shape the concrete. The traveling motor on the trolley is then turned on, driving the slipform trolley and slipform assembly forward along the guide rails along the pipeline longitudinally. This method allows for continuous, uninterrupted pouring of concrete to encase the upper part of the pipeline, forming it in one step. The coordinated use of the lifting and moving components allows for precise adjustment of the height and inclination between the slipform assembly and the pipeline, ensuring the concrete encasement thickness meets design requirements. The continuous movement of the slipform assembly and the action of the vibrator guarantee the compaction and forming quality of the concrete. This method solves the problems of inability to solidify concrete and inconsistent quality in traditional construction methods.

[0010] As a further improvement to the above technical solution, the shaping plate is arranged along the extension direction of the guide rail, and a sealing plate is provided on the end face of the shaping plate. The width of the sealing plate is greater than the thickness of the concrete to be poured. The sealing plate is a rubber component. The design of the rubber sealing plate can effectively prevent concrete leakage from the front end of the slipform assembly, ensuring the integrity and density of the concrete during the pouring process. The rubber material has a certain degree of elasticity and sealing properties, which can better adapt to minor unevenness on the pipe surface, improving the quality of concrete encapsulation. The width of the rubber sealing plate, greater than the thickness of the concrete to be poured, ensures complete coverage of the concrete cross-section, preventing grout leakage and formwork displacement.

[0011] Further improvements include a detachable sealing plate that can be attached to the end face of the shaping plate. The width of the sealing plate can be selected based on the concrete encapsulation thickness. For example, if the designed concrete encapsulation thickness is 10cm, a 12cm wide sealing plate can be used and installed at the end of the shaping mold frame in the forward direction of the slipform trolley. This ensures that concrete will not leak from the front end during pouring, and the rubber sealing plate can fit tightly against the pipe surface, improving the sealing effect.

[0012] In a further improvement, the sliding formwork trolley is equipped with a variable frequency motor for controlling its movement on the guide rails. The variable frequency motor can rotate in both directions, allowing the trolley frame to move back and forth along the longitudinal direction of the pipeline, thus improving flexibility.

[0013] A further improvement includes a movable component disposed on the lifting assembly, wherein the shaping mold is mounted on the lifting assembly.

[0014] In a further improvement, the lifting assembly includes a lifting rod and a rotating nut sleeve. The rotating nut sleeve is rotatably and fixedly mounted on the shaping mold frame. The moving assembly is located at the bottom end of the lifting rod. The shaping mold frame is provided with a lifting groove that extends vertically. The lifting rod is provided with a threaded section, and the threaded section is threadedly connected to the rotating nut sleeve.

[0015] In a further improvement, the moving component includes a fixed base and a sliding base, the sliding base being slidably fixed to the fixed base, the shaping mold being mounted on the fixed base, and the sliding direction of the sliding base being perpendicular to the extension direction of the guide rail.

[0016] In a further improvement, the shaping plate can be detached from the shaping mold frame.

[0017] This invention also provides a construction method for a concrete encapsulation device for buried shallow-buried pipelines, comprising:

[0018] Install guide rails on the top of the two sidewalls of the trench;

[0019] The tires of the sliding formwork trolley are supported on the guide rails;

[0020] The lifting and moving components adjust the height and inclination between the sliding formwork component and the pipe to meet the required thickness of the concrete for pipe encapsulation.

[0021] Adjust the concrete mix design parameters according to the pipe diameter, the thickness of the encasing concrete, and climatic factors;

[0022] Pour concrete into the feed hopper, start the attached vibrator to compact the concrete, and continuously pour concrete into the feed hopper to maintain a certain amount of concrete in the feed hopper.

[0023] Turn on the traveling motor on the trolley to drive the sliding formwork trolley and sliding formwork assembly to move longitudinally along the pipeline on the guide rail, so as to continuously and uninterruptedly pour and encapsulate concrete on the upper part of the pipeline. The vibrator makes the concrete dense and formed in one go.

[0024] Moisturize and cure the concrete within 12 hours after pouring. After the concrete strength reaches 70% of the design value, backfill the pipe trench and carry out subsequent construction procedures. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0026] Figure 1 This is a front view of an embodiment of a concrete encapsulation construction device for buried shallow pipes provided by the present invention, wherein the four arrows represent left, right, up and down respectively;

[0027] Figure 2 This is a side view of an embodiment of a concrete encapsulation construction device for buried shallow pipes provided by the present invention, wherein the four arrows represent forward, backward, upward and downward directions respectively;

[0028] Figure 3This is a top view of an embodiment of a concrete encapsulation construction device for buried shallow pipes provided by the present invention, wherein the four arrows represent forward, backward, left and right directions respectively;

[0029] Figure 4 This is a top view of an embodiment of a concrete encapsulation construction device for buried shallow pipes provided by the present invention, wherein the four arrows represent forward, backward, left and right directions respectively;

[0030] Figure 5 This is a front view of an embodiment of a concrete encapsulation construction device for buried shallow pipes provided by the present invention, wherein the four arrows represent left, right, up and down respectively;

[0031] Figure 6 This is a front view of an embodiment of a concrete encapsulation construction device for buried shallow pipelines provided by the present invention, wherein the four arrows represent left, right, up and down respectively.

[0032] Figure label:

[0033] Guide rail 100, sliding formwork trolley 200, frame body 210, tire 220, lifting assembly 300, lifting rod 310, rotating nut sleeve 320, sliding formwork assembly 400, feeding hopper 410, storage bin 420, shaping mold frame 430, mechanical vibration device 440, shaping plate 450, sealing plate 451, poured concrete 501, concrete to be poured 502, foundation pad 503, trench sidewall 504, precast pipe 505. Detailed Implementation

[0034] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0035] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0036] In the description of this invention, if there are words such as "several", they mean one or more, "multiple" means two or more, "greater than", "less than", "exceeding" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself.

[0037] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0038] Existing methods for concrete encapsulation of shallow-buried pipelines suffer from inconsistent construction quality. Specifically, during the second pour, the concrete needs to encapsulate the upper semi-circular section of the pipeline. However, due to a lack of molds, the concrete cannot set properly, or construction workers neglect quality control. This leads to unstable concrete encapsulation quality, easily causing safety hazards during later use. In severe cases, rework may be necessary, delaying the project. The main reason for this problem is the lack of effective concrete forming equipment and construction methods in current technology, which cannot guarantee the one-time forming and quality stability of the concrete encapsulation. Therefore, referring to... Figures 1 to 6 The present invention provides a concrete encapsulation construction device and method for buried shallow pipelines, as illustrated in the following embodiments:

[0039] A concrete encapsulation construction device for buried shallow pipelines includes guide rails 100, a slipform trolley 200, a lifting component 300, a moving component, and a slipform component 400. Two guide rails 100, arranged longitudinally with the pipeline, are installed on the top of the two side walls of the trench. The guide rails 100 are detachable and movable steel rails, and the interval between the two detachable and movable steel rails is adjusted according to the width of the trench.

[0040] The slipform trolley 200 includes a frame 210 and four tires 220. The four tires 220 are rotatably mounted on the bottom of the frame 210. The multiple tires 220 are slidably mounted on two longitudinally arranged guide rails 100. The frame 210 can move along the guide rails 100. The slipform trolley 200 is equipped with a variable frequency motor for controlling the movement of the slipform trolley 200 on the guide rails 100. The variable frequency motor can rotate in both directions to control the frame 210 to move back and forth along the longitudinal direction of the pipeline, improving flexibility.

[0041] The lifting assembly 300 is mounted on the trolley frame 210 and is used to adjust the height between the slipform assembly 400 and the pipe. The moving assembly is mounted on the lifting assembly 300 and is used to adjust the position between the slipform assembly and the pipe to meet the required thickness of the concrete for pipe encapsulation. The slipform assembly 400 includes a feeding hopper 410, a storage bin 420, a shaping mold frame 430, a mechanical vibrator 440, and a concrete shaping component. The shaping mold frame 430 is mounted on the moving assembly, and the concrete shaping component is mounted on the bottom end of the shaping mold frame 430. The mechanical vibrator 440 and the storage bin 420 are located on the shaping mold frame 430. The feeding hopper 410 is located at the inlet of the storage bin 420. The concrete shaping component is connected to the outlet end of the storage bin 420. The concrete shaping component includes a shaping plate 450 with a semi-circular cross-section. During operation, the shaping plate 450 is located on the outer periphery of the pipe, enabling continuous and uninterrupted pouring of the upper part of the pipe encapsulation concrete, forming it in one step. For better understanding... Figure 1 The marked areas are: 501 (concrete already poured), 502 (concrete to be poured), 503 (foundation cushion), 504 (trench sidewall), and 505 (precast pipe).

[0042] Concrete enters from the feed hopper 410, falls into the storage bin 420, and then spreads towards the forming mold 430. The attached vibrator is activated to compact and shape the concrete. The traveling motor on the trolley is then turned on, driving the slipform trolley 200 and slipform assembly 400 forward longitudinally along the pipeline on the guide rail 100. This method achieves continuous and uninterrupted pouring of the upper part of the pipeline encapsulation concrete, forming it in one go. This single-stage construction enhances the overall integrity and controls the risk of leakage. The concrete solidifies the pipeline with the surrounding soil, improving the interaction between the pipe and the soil and reducing stress concentration caused by uneven soil settlement. The coordinated use of the lifting assembly 300 and the moving assembly allows for precise adjustment of the height and inclination between the slipform assembly 400 and the pipeline, ensuring the concrete encapsulation thickness meets design requirements. The continuous movement of the slipform assembly 400 and the action of the vibrator guarantee the compaction and forming quality of the concrete. This method solves the problems of inability to solidify concrete and unstable quality in traditional construction.

[0043] Further improvements include a shaping plate 450 extending along the guide rail 100, with a sealing plate 451 on its end face. The width of the sealing plate 451 is greater than the thickness of the concrete to be poured. The sealing plate 451 is a rubber component. This rubber sealing plate 451 effectively prevents concrete leakage from the front end of the slipform, ensuring the integrity and density of the concrete during pouring. Due to the elasticity and sealing properties of rubber, it better adapts to minor unevenness on the pipe surface, improving the quality of the concrete encapsulation. The width of the rubber sealing plate 451, greater than the thickness of the concrete to be poured, ensures complete coverage of the concrete cross-section, preventing grout leakage and formwork slippage.

[0044] Further improvements include a detachable sealing plate 451 attached to the end face of the shaping plate 450. The sealing plate 451 is screwed to the front end of the shaping plate 450, and its width is selected based on the concrete encapsulation thickness. For example, if the designed concrete encapsulation thickness is 10cm, a 12cm wide sealing plate 451 can be used and installed at the end of the shaping mold frame 430 in the forward direction of the slipform trolley 200. This ensures that concrete will not leak from the front end during pouring, and the rubber sealing plate 451 can fit tightly against the pipe surface, improving the sealing effect.

[0045] In a further improvement, the lifting assembly 300 includes a lifting rod 310 and a rotating nut sleeve 320. The rotating nut sleeve 320 is rotatably and fixedly mounted on the shaping mold frame 430. A movable component is located at the bottom end of the lifting rod 310. The shaping mold frame 430 has vertically extending lifting grooves. The lifting rod 310 has a threaded section, which is threadedly connected to the rotating nut sleeve 320. By continuously rotating the nut sleeve 320, the lifting rod 310 rises and falls accordingly, driving the shaping mold frame 430 to rise and fall, adjusting the height of the shaping mold frame 430. The height between the sliding mold assembly 400 and the pipeline meets the construction requirements. For convenient rotation, the rotating nut sleeve 320 is provided with a hand-tightening part; in this embodiment, the hand-tightening part is a rotating handwheel.

[0046] In a further improvement, the moving component includes a fixed base and a sliding base. The sliding base is slidably fixed to the fixed base, and the shaping mold 430 is located on the fixed base. The sliding direction of the sliding base is perpendicular to the extension direction of the guide rail 100. The sliding base can be fixed to the fixed base by multiple screws or a snap-fit ​​structure. By finely adjusting the position of the sliding base left and right, the shaping plate 450 is positioned on a concentric circle at the center of the pipe.

[0047] Further improvements include the ability to detach the shaping plate 450 from the forming mold 430, allowing for adjustments to different specifications of the shaping plate 450 based on varying pipe diameters for better shaping. The concrete encapsulation of shallow-buried pipes constrains pipe deformation. The rigid structure of concrete limits pipe displacement due to backfill settlement, vehicle vibration, or temperature changes, reducing the risk of pipe joint detachment, deformation, or breakage. The concrete wrapping layer outside the pipe forms a rigid protective shell; when subjected to various loads or ground loads, the concrete layer evenly distributes concentrated loads to the surrounding soil and foundation, preventing localized pressure deformation or rupture of the pipe.

[0048] In a further improvement, the mechanical vibrating device 440 is located at the tail end of the shaping mold 430, and the mechanical vibrating device 440 can be an attached vibrator.

[0049] This invention also provides a construction method for a concrete encapsulation device for buried shallow-buried pipelines, comprising:

[0050] Step S100: Install guide rails 100 on the top of the two sidewalls of the trench;

[0051] Step S200: The tires 220 of the sliding formwork trolley 200 are supported on the guide rail 100;

[0052] Step S300: The lifting component 300 and the moving component adjust the height and inclination between the sliding formwork component 400 and the pipe to meet the requirements of the concrete thickness for pipe encapsulation.

[0053] Step S400: Adjust the concrete mix design parameters based on pipe diameter, encasing concrete thickness, and climatic factors. By adjusting the concrete mix design and construction parameters according to specific engineering conditions, the fluidity, workability, and strength of the concrete can be ensured to be best suited to the current construction environment and requirements. This flexible adjustment method can improve the construction quality of concrete and reduce construction problems caused by unsuitable concrete properties, such as segregation, honeycombing, and voids. Simultaneously, this method can optimize resource utilization and improve construction efficiency. For example, for encasing small-diameter pipes such as DN300, smaller aggregate sizes (5-20mm) can be selected, and the concrete slump can be adjusted to between 140-180mm to ensure that the concrete can fully fill confined spaces. During construction in cold weather, the cement content can be appropriately increased, the water-cement ratio reduced, and admixtures such as early-strength agents used to ensure early strength development of the concrete.

[0054] Step S500: Pour concrete into the feed hopper 410, start the attached vibrator to compact the concrete, and continuously pour concrete into the feed hopper 410 to maintain a certain amount of concrete in the feed hopper 410.

[0055] Step S600: Turn on the traveling motor on the trolley to drive the sliding formwork trolley 200 and the sliding formwork assembly 400 to move longitudinally along the pipeline on the guide rail 100, so as to realize continuous and uninterrupted pouring of encapsulating concrete on the upper part of the pipeline, and the vibrator to make the concrete dense and formed in one go.

[0056] Step S200: Moisturize and cure the concrete within 12 hours after pouring. After the concrete strength reaches 70% of the design value, backfill the trench and carry out subsequent construction procedures.

[0057] The specific implementation includes trench excavation and foundation treatment, pipeline installation and pouring of the first stage concrete, and pipeline encapsulation and pouring of the second stage concrete.

[0058] 1. Trench excavation

[0059] 1. Verify the design drawings and confirm the pipeline route, elevation, pipe diameter, and burial depth.

[0060] 2. Use a total station or theodolite to accurately lay out the trench centerline, slope line and excavation boundary, and set control stakes.

[0061] 3. Excavation should be carried out manually or mechanically according to site characteristics, and slopes should be laid according to specifications based on soil conditions.

[0062] 2. Basic processing

[0063] 1. Manually clear the bottom to avoid disturbing the original soil. If there is local over-excavation, backfill with sand and gravel and compact it.

[0064] 2. Lay the subbase according to design requirements and pour the foundation concrete. Recycled aggregate concrete and formaldehyde-free substrates should be used to help reduce environmental pollution and resource waste. Recycled aggregate concrete utilizes construction waste, reducing the use of natural aggregates, while formaldehyde-free substrates reduce the emission of harmful substances. The use of these materials not only improves the environmental performance of the project, but also allows treated waste concrete to be used as recycled aggregate, replacing some of the natural sand and gravel in the foundation concrete. Simultaneously, formaldehyde-free environmentally friendly adhesives or other formaldehyde-free materials should be used as additives or auxiliary materials in the concrete.

[0065] 3. Quality Acceptance Standards

[0066] The elevation of the trench bottom, the flatness of the trench bottom, and the stability of the slope should meet the requirements of the relevant engineering construction data and acceptance specifications.

[0067] Pipeline installation and first stage concrete pouring:

[0068] 1. When installing pipes on the foundation layer, ensure proper pipe joint treatment as required.

[0069] 2. When pouring the first stage of concrete, if necessary, anti-buoyancy treatment should be carried out on the pipeline. The concrete should be poured in layers on both sides of the pipeline simultaneously until it reaches the horizontal height of the center point of the pipeline.

[0070] Second stage of pipe encapsulation concrete pouring:

[0071] 1. Install detachable and movable channel steel guide rails 100 on the top of the two side walls of the trench.

[0072] 2. The slipform assembly 400 and the moving assembly used for concrete molding are installed on the slipform trolley 200 via the lifting assembly 300. The slipform trolley 200 is supported on the guide rail 100 by rubber wheels.

[0073] 3. The lifting component 300, in conjunction with the adjusting and moving component, adjusts the height and inclination between the sliding formwork component 400 and the pipeline to meet the requirements of the concrete thickness for pipeline encapsulation.

[0074] 4. Adjust the parameters such as concrete aggregate particle size and slump to match the construction process based on factors such as pipe diameter, encasing concrete thickness, and climate.

[0075] 5. Concrete is poured into the feed hopper 410. After falling into the storage bin 420, the concrete spreads freely in the front and rear directions of the forming mold 430. A rubber sealing plate 451 is installed at the end of the forming mold 430 in the forward direction of the sliding formwork trolley 200. The width of the rubber sealing plate 451 is greater than the thickness of the concrete to be poured. An attached medium-frequency vibrator is installed on the tail forming mold 430.

[0076] 6. Start the attached vibrator to compact the concrete, and at the same time continuously pour concrete into the feed hopper 410 to maintain a certain amount of concrete in the feed hopper 410.

[0077] 7. Turn on the traveling motor on the trolley. The motor drives the sliding formwork trolley 200 and the sliding formwork assembly 400 to move longitudinally along the pipeline on the guide rail 100, thereby continuously and uninterruptedly pouring and sealing concrete on the upper part of the pipeline. The vibrator makes the concrete dense and formed in one go.

[0078] 8. Moisturize the concrete within 12 hours of pouring. Backfill the trench and proceed with subsequent construction after the concrete strength reaches 70% of the design value. Timely moisturizing ensures sufficient moisture during the initial hardening process, reducing shrinkage cracks and improving the concrete's strength and durability. Waiting until the concrete strength reaches 70% of the design value before backfilling ensures sufficient strength to withstand the pressure of the backfill soil, preventing deformation or cracking due to premature backfilling. This practice significantly improves project quality and long-term performance. In hot summer weather, immediately cover the concrete with damp burlap after pouring and regularly spray water to maintain humidity within 12 hours. Simultaneously, regularly test the concrete strength using non-destructive testing methods such as a rebound hammer. Only begin trench backfilling when the strength reaches 70% of the design value (e.g., 21 MPa for C30).

[0079] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A concrete encapsulation construction device for buried shallow-buried pipelines, characterized in that, include: Two guide rails are arranged longitudinally with the pipe; The sliding formwork trolley includes a frame and multiple tires. The multiple tires are rotatably mounted on the bottom of the frame and are slidably mounted on two longitudinally arranged guide rails. The lifting assembly is mounted on the trolley frame. A slipform assembly includes a feeding hopper, a storage bin, a shaping mold frame, a mechanical vibrating device, and a concrete shaping component. The shaping mold frame is installed on the lifting assembly, and the concrete shaping component is installed at the bottom end of the shaping mold frame. The mechanical vibrating device and the storage bin are located on the shaping mold frame. The feeding hopper is located at the inlet of the storage bin. The concrete shaping component is connected to the outlet end of the storage bin. The concrete shaping component includes a shaping plate with a semi-circular cross-section.

2. The underground shallow-buried pipeline encapsulation concrete construction device according to claim 1, characterized in that: The shaping plate is arranged along the extension direction of the guide rail, and the end face of the shaping plate is provided with a sealing plate, the width of which is greater than the thickness of the concrete to be poured.

3. The underground shallow-buried pipeline encapsulation concrete construction device according to claim 2, characterized in that: The sealing plate is a rubber component.

4. The underground shallow-buried pipeline encapsulation concrete construction device according to claim 2, characterized in that: The sealing plate can be detached from the end face of the shaping plate.

5. The underground shallow-buried pipeline encapsulation concrete construction device according to claim 1, characterized in that: The sliding formwork trolley is equipped with a variable frequency motor for controlling the movement of the sliding formwork trolley on the guide rail.

6. The underground shallow-buried pipeline encapsulation concrete construction device according to claim 1, characterized in that: It also includes a movable component disposed on the lifting assembly, and the shaping mold is mounted on the lifting assembly.

7. The underground shallow-buried pipeline encapsulation concrete construction device according to claim 6, characterized in that: The lifting assembly includes a lifting rod and a rotating nut sleeve. The rotating nut sleeve is rotatably and fixedly mounted on the shaping mold frame. The moving assembly is located at the bottom end of the lifting rod. The shaping mold frame is provided with a lifting groove that extends vertically. The lifting rod is provided with a threaded section, and the threaded section is threadedly connected to the rotating nut sleeve.

8. A concrete encapsulation construction device for buried shallow pipelines according to claim 6, characterized in that: The moving component includes a fixed base and a sliding base. The sliding base is slidably fixed to the fixed base, and the shaping mold is mounted on the fixed base. The sliding direction of the sliding base is perpendicular to the extension direction of the guide rail.

9. A concrete encapsulation construction device for buried shallow pipelines according to claim 1, characterized in that: The shaping plate can be detached from the shaping mold frame.

10. A construction method for a concrete encapsulation device for buried shallow-buried pipelines, characterized in that, The construction apparatus according to any one of claims 1 to 9 comprises: Install guide rails on the top of the two sidewalls of the trench; The tires of the sliding formwork trolley are supported on the guide rails; The lifting and moving components adjust the height and inclination between the sliding formwork component and the pipe to meet the required thickness of the concrete for pipe encapsulation. Adjust the concrete mix design parameters according to the pipe diameter, the thickness of the encasing concrete, and climatic factors; Pour concrete into the feed hopper, start the attached vibrator to compact the concrete, and continuously pour concrete into the feed hopper to maintain a certain amount of concrete in the feed hopper. Turn on the traveling motor on the trolley to drive the sliding formwork trolley and sliding formwork assembly to move longitudinally along the pipeline on the guide rail, so as to continuously and uninterruptedly pour and encapsulate concrete on the upper part of the pipeline. The vibrator makes the concrete dense and formed in one go. Moisturize and cure the concrete within 12 hours after pouring. After the concrete strength reaches 70% of the design value, backfill the pipe trench and carry out subsequent construction procedures.

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