A construction method for improving the density of concrete pouring in pipe-roof steel pipes

Abstract

This invention provides a construction method for improving the density of concrete pouring inside steel pipes in tunnel lining for horizontal tunnel support or settlement protection. The method includes the following steps: S1 Pre-treatment of the steel pipe to be constructed: Treating the steel pipe to form a cavity structure with an inlet, the cavity structure is placed horizontally inside the tunnel; S2 Assembly of a mobile pouring device: The mobile pouring device extends into the cavity structure at its maximum extension length, forming a pouring cavity between itself and the end of the cavity structure; S3 Pouring: Pouring fluid enters the pouring cavity through the inlet and is poured. When the pressure in the pouring cavity reaches a set value, pouring stops. The mobile pouring device moves backward to retract, then continues to move backward to its maximum extension length, forming the next pouring cavity between itself and the previously poured cavity; S4 Re-pouring: Repeating step S3 until the entire pouring is completed. This invention achieves control over density through process control, thereby improving the density and strength of the steel pipe in the protection.

Description

Technical Field

[0001] This invention relates to the field of tunnel pipe curtain concrete pouring construction technology, and in particular to a construction method for improving the density of concrete pouring inside the steel pipe of the pipe curtain. Background Technology

[0002] Pipe jacking is a construction method that uses machinery to drive steel pipes into the perimeter of a newly constructed tunnel to form support. The steel pipes are installed inside the soil between the tunnel and the structure requiring settlement control. Concrete is poured inside the pipes, and the interlocking joints on the pipes are lapped together. Grout is injected into the gaps to provide waterproofing and waterproofing, and to create sufficient strength to connect the pipes into a shell-like structure. The pipe jacking then serves as pre-support, and the tunnel is excavated inside until completion. Because pipe jacking construction is underground, it does not require large-scale excavation, minimizing the impact on surface traffic and pedestrian flow, thus avoiding the adverse effects of traffic diversion. It does not damage existing roads or require the relocation of shallow underground pipelines, reducing the impact on the lives of surrounding residents. Due to its effective settlement control, pipe jacking ensures the safety of existing buildings and structures, and its low construction noise and vibration allow for continuous 24-hour construction.

[0003] In existing technologies, the steel pipe is poured directly in one go during support construction. However, the pouring cavity is relatively large and is not constructed in sections. Consequently, it is impossible to monitor the pouring process in real time, resulting in the pouring of the molten liquid being poured arbitrarily, the density not being well guaranteed, and the pouring effect being poor. Summary of the Invention

[0004] The purpose of this invention is to provide a construction method for improving the density of concrete pouring inside steel pipes in pipe curtains. By moving and unfolding the pouring device, segmented pouring is achieved, which facilitates real-time monitoring. In particular, after segmentation, the construction observation points are more specific, the pressure is controlled, the presence of vacuum is reduced, the density of concrete pouring inside the pipe is improved, and the load-bearing capacity is increased.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A construction method for improving the density of concrete pouring inside a steel pipe liner, used for horizontal tunnel support or settlement protection, includes the following steps:

[0007] S1 Pretreatment of the steel pipe to be constructed: The steel pipe to be constructed is treated to form a cavity structure with an entrance, and the cavity structure is placed horizontally inside the tunnel;

[0008] S2 Mobile Casting Device Assembly: The mobile casting device is extended into the cavity structure of the tunnel at its maximum extension length, forming a casting cavity between itself and the end of the cavity structure;

[0009] S3 pouring: The pouring liquid enters the pouring chamber through the inlet via the mobile pouring device. When the pressure in the pouring chamber reaches the set value, the pouring stops. After the mobile pouring device moves backward and contracts, it continues to move backward to its maximum extension length, forming the next pouring chamber with the poured chamber after the previous one.

[0010] S4 Re-pouring: Repeat step S3 until the entire cavity structure is poured.

[0011] In this invention, by processing the steel pipe to be constructed, the end of the steel pipe to be constructed becomes the end of the tunnel. During the pouring process, the sealing and compactness of the end are ensured. Especially for horizontally laid tunnels, it can directly form support.

[0012] In this invention, the cavity structure is placed horizontally inside the tunnel to directly form horizontal support, and then the pouring liquid is used for pouring. At this time, horizontal pouring is not easy to control, but by combining a mobile pouring device, a better pouring effect can be ensured, especially the method of pouring while expanding and contracting.

[0013] In this invention, a telescopic pouring device is used as the main component, which is then used to realize a mobile pouring device. While pouring, the pouring device moves as the pouring progresses. The telescopic nature of the device ensures that the positional relationship between the pouring device and the cavity structure is constantly changing, providing a good guarantee for construction.

[0014] As a further improvement of the present invention, the pretreatment of the steel pipe to be constructed in step S1 is specifically as follows: one end of the steel pipe to be constructed is blocked in advance by a blocking component or welding, and the blocked steel pipe to be constructed is placed horizontally into the tunnel.

[0015] In this technical solution, the steel pipe to be constructed is sealed in advance. Specifically, a baffle can be used for sealing and blocking. In this way, the steel pipe to be constructed directly forms a pouring cavity, providing a foundation for subsequent pouring.

[0016] As a further improvement of the present invention, the assembly of the casting device in step S2 specifically includes the following steps:

[0017] Installation of S21 mobile pouring device: The feeding component, telescopic component and feeding pipe are respectively installed in the mobile component, and the mobile component is equipped with a feeding port that communicates with the feeding component.

[0018] The S22 mobile pouring device is connected to the outside world by connecting the feeding pipe to the external feeding pump assembly through the connecting component.

[0019] The S23 mobile pouring device unfolds: Under the action of external force, the telescopic component unfolds, and when unfolded, it drives the feeding pipe to move towards the blocked end of the steel pipe to be constructed.

[0020] Assembly of S24 mobile pouring device: External force pushes the feeding pipe to drive the moving component away from the inlet, and at the same time, the moving component extends into the steel pipe to be constructed.

[0021] In this technical solution, a mobile pouring device is selected because it can be moved to adjust the position of the entire device, creating pouring cavities of different sizes relative to the pouring location, thus facilitating pouring control. Of course, any pouring device with a movable function that can adjust the size of the pouring cavity can also be used.

[0022] As a further improvement of the present invention, in the installation of the pouring device in step S21, the feeding component is assembled at the feeding port, and several telescopic components are arranged around the feeding port as the base point to form a enclosure structure for the feeding component.

[0023] In this technical solution, since the pouring fluid is pressurized, the feeding pipe and other components will have a certain weight and pressure. If a barrier structure is formed by telescopic components, the feeding pipe can be well protected and the stability of the feeding pipe in the horizontal direction can be ensured.

[0024] As a further improvement of the present invention, the unfolding of the casting device in step S23 is specifically as follows: the telescopic component is formed by a hydraulic rod, and the moving component moves inward along the mounting cavity by controlling the extension of the hydraulic rod, thereby realizing the unfolding.

[0025] In this technical solution, a hydraulic rod is used to form a telescopic assembly. The hydraulic rod is easy to control and has a certain strength. During telescopic movement, it can be well controlled and the stability of the pouring fluid flow can be ensured. Preferably, a 1m or 2m telescopic rod is selected.

[0026] As a further improvement of the present invention, step S3 of casting specifically includes the following steps:

[0027] S31 Pouring Start: The unfolded mobile pouring device forms a pouring cavity with the innermost end of the cavity structure. The pouring of the pouring cavity is started by pressurizing the pouring method.

[0028] S32 Pouring Monitoring: Utilizes real-time monitoring equipment to monitor the pressure inside the pouring cavity and sets early warning pressure values;

[0029] S33 Pouring Control: When the pressure inside the pouring chamber exceeds the warning pressure value, pouring stops, the deployed mobile pouring device retracts and moves toward the end away from the pouring chamber, then deploys again.

[0030] In this technical solution, the pouring device enters in an unfolded manner before pouring, which ensures that the pouring device enters with the longest possible length, providing a basis for subsequent retraction and retraction, and thus enabling subsequent retraction to form a pouring cavity again.

[0031] As a further improvement of the present invention, in the pouring control of step S33, the retraction of the deployed mobile pouring device specifically means that the deployed pouring device compresses towards the inlet direction with the end of the telescopic component away from the mobile component as the base point, so that the mobile component moves backward towards the inlet direction.

[0032] In this technical solution, the concrete action involves compressing and retracting towards the inlet direction, thereby gradually approaching the location of the pouring liquid and pouring it step by step.

[0033] As a further improvement of the present invention, step S3 of the casting process also includes venting control during casting. Specifically, the venting control involves providing several vent holes along the end of the moving component, and the gas flows out through the vent holes via an anti-blocking path and a narrowed annular path located on the outer periphery of the anti-blocking path.

[0034] In this technical solution, there are multiple paths within the vent hole, and therefore there must be partitions between these paths. These partitions are used to prevent clogging of the vent hole in case of leakage of the pouring fluid. Furthermore, the outer periphery of the anti-clogging path has a recessed structure, meaning that the cross-sectional area becomes smaller and smaller. Conversely, the anti-clogging path must have a larger and larger cross-sectional area, resulting in a smaller cross-sectional area near the pouring cavity. At this point, large pouring fluid particles cannot enter, thus achieving anti-clogging.

[0035] As a further improvement of the present invention, the assembly of the casting device in step S2 and the casting in step S3 both include the rotation and movement of the moving component. Specifically, the rotation and movement of the moving component is as follows: the outer wall of the moving component rotates and moves by friction with the inner wall of the cavity structure as the track.

[0036] In this technical solution, the guide rail is directly formed on the inner wall of the cavity structure. Combined with friction, the component can rotate and move directly, which is easy to control. Specifically, rolling structures such as balls can be added to the outer periphery of the moving component by local embedding, so that the rolling component can rotate or move along the inner wall with low friction.

[0037] As a further improvement of the present invention, it also includes the removal of the S5 feeding pipe, specifically: the feeding pipe is connected by several pipe sections, the length of the casting section is equal to the length of the pipe section, and after each casting section is completed, the feeding pipe moves backward toward the inlet direction, withdrawing one pipe section, and the withdrawn pipe section is removed.

[0038] In this technical solution, the length of the pipe section is matched with the length of the corresponding casting section, and the casting and unloading are carried out section by section, which improves efficiency.

[0039] The beneficial effects of the present invention are as follows:

[0040] First, in this invention, a semi-enclosed pipe is used to form a pouring area between the closed end of the pipe and the pouring device. Then, by pouring in sections, combined with the formation of the area, the control during the construction process becomes segmented control, which reduces the difficulty of control and, in particular, avoids the existence of excessively large or too many vacuum holes.

[0041] Secondly, in this invention, the pouring device is telescopic before the pouring is completed. When the pouring reaches a certain level, the pouring device slowly retracts, ensuring the density during the pouring process. Specifically, pressure monitoring and venting can be used to assist in controlling the density.

[0042] Furthermore, in this invention, the pouring device is movable compared to the previous one, and the pouring area is also smaller. As a result, pressure and density measurements are performed simultaneously during pouring. When large air vents or the like occur, pressure and other measurements are taken in advance to ensure density. Attached Figure Description

[0043] Figure 1 A flowchart of a construction method for improving the compactness of concrete pouring inside a steel pipe caisson, provided by the present invention;

[0044] Figure 2 A flowchart of the assembly of the casting device provided by the present invention;

[0045] Figure 3 A flowchart of the pouring steps provided by the present invention;

[0046] Figure 4 This is a schematic diagram of the structure of the casting device provided by the present invention;

[0047] Figure 5 This is a schematic diagram of the structure of the mobile component provided by the present invention;

[0048] In the picture:

[0049] 1. Steel pipe to be constructed; 11. Inlet; 2. Sealing plate; 3. Moving component; 4. Feeding component; 5. Connecting plate; 6. Telescopic component; 7. Feeding pipe; 34. Ball bearing; 35. Steel ring; 36. Feeding port; 37. Vent hole; 38. Conical spring. Detailed Implementation

[0050] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings. However, it should be noted that these embodiments are not intended to limit the present invention. Equivalent changes or substitutions in function, method, or structure made by those skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0051] Example 1

[0052] This embodiment mainly introduces the core principles and steps of a construction method for improving the density of concrete pouring inside a pipe curtain steel pipe.

[0053] See attached document Figure 1-3 This embodiment presents a construction method for improving the density of concrete pouring inside a pipe-jacking steel pipe, used for horizontal tunnel support or settlement protection, comprising the following steps:

[0054] S1 Pretreatment of the steel pipe to be constructed: The steel pipe to be constructed is treated to form a cavity structure with an entrance, and the cavity structure is placed horizontally inside the tunnel;

[0055] S2 Mobile Casting Device Assembly: The mobile casting device is extended into the cavity structure of the tunnel at its maximum extension length, forming a casting cavity between itself and the end of the cavity structure;

[0056] S3 pouring: The pouring liquid enters the pouring chamber through the inlet via the mobile pouring device. When the pressure in the pouring chamber reaches the set value, the pouring stops. After the mobile pouring device moves backward and contracts, it continues to move backward to its maximum extension length, forming the next pouring chamber with the poured chamber after the previous one.

[0057] S4 Re-pouring: Repeat step S3 until the entire cavity structure is poured.

[0058] First, in this invention, a semi-enclosed pipe is used to form a pouring area between the closed end of the pipe and the pouring device. Then, by pouring in sections, combined with the formation of the area, the control during the construction process becomes segmented control, which reduces the difficulty of control and, in particular, avoids the existence of excessively large or too many vacuum holes.

[0059] Secondly, in this invention, the pouring device is telescopic before the pouring is completed. When the pouring reaches a certain level, the pouring device slowly retracts, ensuring the density during the pouring process. Specifically, pressure monitoring and venting can be used to assist in controlling the density.

[0060] Furthermore, in this invention, the pouring device is movable compared to the previous one, and the pouring area is also smaller. As a result, pressure and density measurements are performed simultaneously during pouring. When large air vents or the like occur, pressure and other measurements are taken in advance to ensure density.

[0061] In this invention, by processing the steel pipe to be constructed, the end of the steel pipe to be constructed becomes the end of the tunnel. During the pouring process, the sealing and compactness of the end are ensured. Especially for horizontally laid tunnels, it can directly form support.

[0062] In this invention, the cavity structure is placed horizontally inside the tunnel to directly form horizontal support, and then the pouring liquid is used for pouring. At this time, horizontal pouring is not easy to control, but by combining a mobile pouring device, a better pouring effect can be ensured, especially the method of pouring while expanding and contracting.

[0063] In this invention, a telescopic pouring device is used as the main component, which is then used to realize a mobile pouring device. While pouring, the pouring device moves as the pouring progresses. The telescopic nature of the device ensures that the positional relationship between the pouring device and the cavity structure is constantly changing, providing a good guarantee for construction.

[0064] Example 2

[0065] In this embodiment, a specific pouring device will be described.

[0066] See attached document Figure 1 As shown in this embodiment, the pretreatment of the steel pipe to be constructed in step S1 is specifically as follows: one end of the steel pipe to be constructed is blocked in advance by a blocking component or welding, and the blocked steel pipe to be constructed is placed horizontally into the tunnel.

[0067] In this embodiment, the steel pipe to be constructed is sealed in advance. Specifically, a baffle can be used for sealing and blocking. In this way, the steel pipe to be constructed directly forms a pouring cavity, providing a foundation for subsequent pouring.

[0068] In this embodiment, by sealing the end, a sealing surface is formed at the end, creating a small pouring area with the ground to be poured. Then, combined with the pouring device, a method of simultaneous pouring and control is used. As the concrete flows into the pouring area, it does not accumulate in the pipe but directly enters the pouring area. At the same time, combined with subsequent pressure monitoring, the existence of a vacuum zone is avoided, resulting in full pouring, less air entrapment, improved pouring density, and increased pipe load-bearing capacity.

[0069] Specifically, refer to the appendix Figure 2 As shown, the pouring device in this embodiment includes a steel pipe 1 to be constructed, a sealing plate 2 located at the end of the steel pipe, a moving component 3, a feeding component 4, and a telescopic component 6. One end of the telescopic component 6 is fixed to the moving component 3, and the other end is fixed to the connecting plate 5. Specifically, the assembly process of the pouring device is as follows:

[0070] Installation of S21 mobile casting device: The feeding component 4, the telescopic component 6 and the feeding pipe 7 are respectively installed in the mobile component 3. The mobile component 3 is equipped with a feeding port 36 that communicates with the feeding component 4.

[0071] Connection between the S22 mobile pouring device and the outside world: The feeding pipe 7 is connected to the external feeding pump assembly through the connecting component.

[0072] The S23 mobile pouring device unfolds: Under the action of external force, the telescopic component 6 unfolds, and when unfolded, it drives the feeding pipe 7 to move towards the blocked end of the steel pipe 1 to be constructed.

[0073] Assembly of the S24 mobile pouring device: An external force pushes the feeding pipe 7, causing it to move the moving component 3 toward the end away from the inlet 11. At the same time, the moving component extends into the steel pipe to be constructed. Specifically, the above operation causes the feeding port 36 to be positioned toward the end away from the opening 11, and the moving component 3 to extend into the steel pipe 1 to be constructed.

[0074] In this embodiment, before pouring, the pouring device is pre-connected to the outside environment and enters by unfolding, directly forming a relatively small pouring space. As the pouring process progresses, the pouring cavity can be adjusted later by controlling the movement of the mobile device backward. Furthermore, a mobile pouring device is chosen because it can be moved to adjust the position of the entire device, creating pouring cavities of different sizes relative to the pouring location, facilitating pouring control. Of course, a pouring device with a movable function, capable of adjusting the size of the pouring cavity, can also be used.

[0075] Furthermore, in the installation of the pouring device in step S21, the feeding component 4 is assembled at the feeding port 36, and several telescopic components 6 are arranged around the feeding port 36 as the base point to form the enclosure structure of the feeding component 4.

[0076] In this embodiment, several telescopic components are circumferentially welded to the cross-sectional direction of the movable component. This cross-sectional arrangement forms a barrier, and the multiple telescopic components extend and retract synchronously, allowing for control of the pouring area length from multiple directions, as well as post-pouring retraction. Furthermore, since the pouring fluid is pressurized, the feeding pipe and other components experience weight and pressure. Using telescopic components to form a barrier structure effectively protects the feeding pipe, ensuring its stability during horizontal movement.

[0077] Specifically, the length of the feeding component is greater than or equal to the maximum length of the telescopic component, and a plurality of the telescopic components form a enclosure cavity, and the feeding component is located inside the enclosure cavity.

[0078] Furthermore, the unfolding of the casting device in step S23 specifically involves: forming the telescopic component with a hydraulic rod, and controlling the extension of the hydraulic rod to make the moving component move inward along the mounting cavity to achieve unfolding.

[0079] In this embodiment, a hydraulic rod is used to form the telescopic assembly. The hydraulic rod is easy to control and has a certain strength. During telescopic movement, it can be well controlled and the stability of the pouring fluid flow can be ensured. Preferably, a 1m or 2m telescopic rod is selected.

[0080] In this embodiment, pouring and support are mainly used in pipe jacking construction, and their support effect is better.

[0081] Example 3

[0082] This embodiment mainly describes other steps, especially the pouring process.

[0083] Specifically, step S3, pouring, includes the following steps:

[0084] S31 Pouring Start: The unfolded mobile pouring device forms a pouring cavity with the innermost end of the cavity structure. The pouring of the pouring cavity is started by pressurizing the pouring method.

[0085] In this embodiment, pressurized pouring specifically refers to pouring at a pressure of 600-650N. At this time, the pouring liquid is pressurized by a pressurizing device to reach this pressure range. This pressure range can ensure that the concrete density meets the specifications and prevent the grouting pipe from bursting or becoming blocked. That is, when the expansion device reaches this pressure, it can expand and contract.

[0086] S32 Pouring Monitoring: Utilizes real-time monitoring equipment to monitor the pressure inside the pouring cavity and sets early warning pressure values;

[0087] S33 Pouring Control: When the pressure inside the pouring chamber exceeds the warning pressure value, pouring stops, the deployed mobile pouring device retracts and moves toward the end away from the pouring chamber, then deploys again.

[0088] In this embodiment, the warning pressure value is less than or equal to 650 Pa. If the pressure exceeds 650 Pa, it is easy to cause the grouting pipe to burst, resulting in construction failure.

[0089] Specifically, when the section is full of fluid, the average pressure on the section is calculated using the formula for the total pressure exerted by the fluid on the section. The specific formula is as follows:

[0090] F=ρghA (1)

[0091] In the above formula (1), ρ is the unit weight of concrete, g is the gravitational acceleration, h is the centroid height, A is the contact area, and F is the pressure, but the value of F cannot exceed 650 Pa.

[0092] In this embodiment, the pouring device enters in an unfolded manner before pouring, which ensures that the pouring device enters with its longest length, providing a basis for subsequent retraction and retraction, and thus enabling subsequent retraction to form a pouring cavity again.

[0093] In this embodiment, when the pouring pressure is between 600-650N, the pouring speed of the pouring fluid is between 0.4-0.5m / s. Using this speed, in combination with this pressure, allows the pouring fluid to be injected relatively well and evenly. Especially in horizontal construction, the pouring fluid carries a certain pressure, and the speed cannot be too fast or too slow. If it is too fast, there will be more friction during pouring, which will reduce some of the pressure. Also, the pouring section is relatively short, and if the speed is too fast, it will be more difficult to control. If the speed is too slow, the pouring process will be slow, affecting the construction period.

[0094] Furthermore, in step S33 of the pouring control, the retraction of the deployed mobile pouring device specifically involves: the deployed pouring device compressing towards the inlet direction with the end of the telescopic component away from the mobile component as the base point, causing the mobile component to retract towards the inlet direction.

[0095] In this embodiment, the concrete compression and retreat towards the inlet direction is used to gradually approach the pouring liquid position and pour the liquid step by step.

[0096] In this embodiment, the telescopic component is specifically an electric push rod telescopic rod, such as a DC electric push rod.

[0097] Furthermore, in step S33 of the pouring control, the retraction of the deployed mobile pouring device specifically involves: the deployed pouring device compressing towards the inlet direction with the end of the telescopic component away from the mobile component as the base point, causing the mobile component to retract towards the inlet direction.

[0098] In this embodiment, the moving component compresses and retracts towards the inlet, gradually approaching the pouring liquid location and pouring the liquid step by step. Furthermore, the entire moving component is controlled to move backward, controlling the pouring process by retracting. This involves pouring while simultaneously retracting, ensuring smooth progress of the pouring process.

[0099] Furthermore, step S3 of the pouring process also includes venting control during the pouring process. Specifically, the venting control involves setting several vent holes along the end of the moving component, and the gas flows out through the vent holes via an anti-blocking path and a narrow-diameter annular path located on the outer periphery of the anti-blocking path.

[0100] In this embodiment, there are multiple paths within the vent hole, and there must be partitions between these paths. These partitions are used to prevent blockage of the vent hole in case of leakage of the casting liquid. Furthermore, the outer periphery of the anti-blockage path has a recessed structure, that is, the cross-sectional area becomes smaller and smaller. Conversely, the anti-blockage path must have a larger and larger cross-sectional area, and thus the cross-sectional area near the casting cavity is small. At this time, large casting liquid particles cannot enter, thus achieving anti-blockage.

[0101] In this embodiment, the added vent holes and the multiple paths formed allow the moving plate to compress and exhaust air inwards; concrete pouring also involves exhaust; and outward movement involves intake. By using different control methods, air intake is ensured while exhaust during pouring is also guaranteed.

[0102] In this embodiment, both the assembly of the casting device in step S2 and the casting in step S3 include the rotation and movement of the moving component. Specifically, the rotation and movement of the moving component is as follows: the outer wall of the moving component rotates and moves by friction with the inner wall of the cavity structure as the track.

[0103] In this embodiment, the guide rail is directly formed on the inner wall of the cavity structure. Combined with friction, the component can rotate and move directly, which is easy to control. Specifically, rolling structures such as balls can be added to the outer periphery of the moving component by local embedding, so that the rolling component can rotate or move along the inner wall with low friction.

[0104] In this embodiment, at least two steel rings 35 are provided on the outer periphery of the moving component 3 to form a receiving cavity. Then, a number of balls 34 are provided in the receiving cavity to form a rolling structure, which then rolls along the inner wall of the steel pipe 1 to be constructed, thereby realizing the movement of the moving component during the extension and retraction of the telescopic component.

[0105] Specifically, it also includes the removal of the S5 feeding pipe, which is as follows: the feeding pipe is connected by several pipe sections, the length of the pouring section is equal to the length of the pipe section, and after each pouring of a pouring cavity is completed, the feeding pipe moves backward toward the inlet direction, withdrawing one pipe section, and the withdrawn pipe section is removed.

[0106] In this embodiment, the pouring is carried out segment by segment according to the length of the pipe section and the length of the corresponding pouring segment, which improves efficiency.

[0107] Example 4

[0108] In this embodiment, the specific construction process is described.

[0109] First, the pretreatment of the steel pipe 1 to be constructed: using welding, the sealing plate 2 is sealed at one end of the steel pipe 1 to be constructed, so that it forms a structure with one end closed and the other end open.

[0110] In this embodiment, the steel pipe 1 to be constructed can be of a fixed length or can be multiple splices. If it is multiple splices, the end of the steel pipe 1 to be constructed at the very end is closed, and the other steel pipes 1 to be constructed are not processed.

[0111] Secondly, the telescopic pouring device is assembled:

[0112] In this embodiment, the telescopic pouring device has three telescopic components 6 with a stroke of 2m, arranged in a circular array. The feeding port and feeding pipe are moved to the center, and the feeding pipe becomes a telescopic pipe, powered by the telescopic components 6.

[0113] Next, pouring: The assembled telescopic pouring device is placed into the steel pipe 1 to be constructed. The feeding component is connected to several pumped concrete pipe sections (2m long) through flanges, and these pipe sections extend all the way to the outside of the steel pipe, connecting to an external pump to pump concrete into the pipe. After the telescopic component and the pumped concrete pipe sections are delivered to the end of the steel pipe, concrete is poured into the pipe. After the concrete fills the cavity, it reaches the sensing pressure of the telescopic component 6. The telescopic component 6 contracts with the connecting plate 5, which is made of steel circular plate, as the leverage point, driving the moving component 3 to pull outward by 2m. At this time, the telescopic component 6 is in its shortest state. It then extends with the connecting plate 5 as the leverage point, pushing the pumped concrete pipe section outward. After removing one pumped concrete pipe section, the process continues while contracting and pouring. After pouring 2m, another pipe section is removed. This cycle is repeated until the entire steel pipe is filled. After the concrete has set, the other components in the telescopic pouring device are removed.

[0114] In this embodiment, pouring is stopped when the pouring distance reaches 2m, the feeding pipe is disassembled, and pouring resumes, repeating this cycle. In this embodiment, when the pouring pressure is between 600-650N, the pouring speed of the pouring liquid is between 0.4-0.5m / s.

[0115] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

[0116] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0117] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A construction method for improving the density of concrete pouring inside a steel pipe liner, used for horizontal tunnel support or settlement protection, characterized in that... Includes the following steps, S1 Pretreatment of the steel pipe to be constructed: The steel pipe to be constructed is treated to form a cavity structure with an entrance, and the cavity structure is placed horizontally inside the tunnel; S2 Mobile Casting Device Assembly: The mobile casting device is extended into the cavity structure of the tunnel at its maximum extension length, forming a casting cavity between itself and the end of the cavity structure; S3 pouring: The pouring liquid enters the pouring chamber through the inlet via the mobile pouring device. When the pressure in the pouring chamber reaches the set value, the pouring stops. After the mobile pouring device moves backward and contracts, it continues to move backward to its maximum extension length, forming the next pouring chamber with the poured chamber after the previous one. The casting is pressurized casting, specifically casting with a casting pressure of 600-650N. When the expansion component reaches the casting pressure, it can expand and contract. When the pouring pressure is between 600-650N, the pouring speed of the pouring fluid is 0.4-0.5m / s; S4 Re-pouring: Repeat step S3 pouring until the entire cavity structure is poured; It also includes a pouring device, including a steel pipe to be constructed, a sealing plate located at the end of the steel pipe to be constructed, a moving component, a feeding component, and a telescopic component, wherein one end of the telescopic component is fixed to the moving component and the other end is fixed to the connecting plate. The telescopic components are multiple, and the multiple telescopic components are circumferentially welded to the cross-sectional direction of the moving component. The multiple telescopic components extend and retract synchronously.

2. The construction method for improving the density of concrete pouring inside the steel pipe of the pipe curtain as described in claim 1, characterized in that, The pretreatment of the steel pipe to be constructed in step S1 is as follows: one end of the steel pipe to be constructed is blocked in advance by a blocking component or welding, and the blocked steel pipe to be constructed is placed horizontally into the tunnel.

3. The construction method for improving the compactness of concrete pouring inside the steel pipe of the pipe drape according to claim 2, characterized in that, The assembly of the casting device in step S2 specifically includes the following steps: Installation of S21 mobile pouring device: The feeding component, telescopic component and feeding pipe are respectively installed in the mobile component, and the mobile component is equipped with a feeding port that communicates with the feeding component. The S22 mobile pouring device is connected to the outside world by connecting the feeding pipe to the external feeding pump assembly through the connecting component. The S23 mobile pouring device unfolds: Under the action of external force, the telescopic component unfolds, and when unfolded, it drives the feeding pipe to move towards the blocked end of the steel pipe to be constructed. Assembly of S24 mobile pouring device: External force pushes the feeding pipe to drive the moving component away from the inlet, and at the same time, the moving component extends into the steel pipe to be constructed.

4. The construction method for improving the density of concrete pouring inside the steel pipe of the pipe drape according to claim 3, characterized in that, In the installation of the pouring device in step S21, the feeding component is assembled at the feeding port, and several telescopic components are arranged around the feeding port as the base point to form a enclosure structure for the feeding component.

5. A construction method for improving the density of concrete pouring inside a pipe liner steel pipe according to claim 3, characterized in that, The deployment of the casting device in step S23 specifically involves: forming the telescopic component with a hydraulic rod, and controlling the extension of the hydraulic rod to make the moving component move inward along the mounting cavity to achieve deployment.

6. A construction method for improving the density of concrete pouring inside a pipe drape as described in claim 3, characterized in that, The pouring process in step S3 specifically includes the following steps: S31 Pouring Start: The unfolded mobile pouring device forms a pouring cavity with the innermost end of the cavity structure. The pouring of the pouring cavity is started by pressurizing the pouring method. S32 Pouring Monitoring: Utilizes real-time monitoring equipment to monitor the pressure inside the pouring cavity and sets early warning pressure values; S33 Pouring Control: When the pressure inside the pouring chamber exceeds the warning pressure value, pouring stops, the deployed mobile pouring device retracts and moves toward the end away from the pouring chamber, then deploys again.

7. A construction method for improving the density of concrete pouring inside a pipe drape as described in claim 6, characterized in that, In step S33 of the pouring control, the retraction of the deployed mobile pouring device specifically involves the deployed pouring device compressing towards the inlet direction with the end of the telescopic component away from the mobile component as the base point, causing the mobile component to retract towards the inlet direction.

8. A construction method for improving the density of concrete pouring inside a pipe drape as described in claim 3, characterized in that, The step S3 pouring process also includes venting control during pouring. Specifically, the venting control involves setting several vent holes along the end of the moving component. Gas flows out through the vent holes via an anti-blocking path and a narrowed annular path located around the anti-blocking path.

9. A construction method for improving the density of concrete pouring inside a pipe drape as described in claim 3, characterized in that, In both step S2 (assembly of the casting device) and step S3 (casting), the rotation and movement of the moving component are included. Specifically, the rotation and movement of the moving component are achieved by the outer wall of the moving component rotating and moving along the inner wall of the cavity structure via friction.

10. A construction method for improving the density of concrete pouring inside a pipe liner as described in claim 1, characterized in that, It also includes the removal of the S5 feeding pipe, specifically: the feeding pipe is made up of several pipe sections connected together, and the length of the pouring section is equal to the length of the pipe section. After each pouring of a section of the pouring cavity is completed, the feeding pipe moves backward toward the inlet direction, withdrawing one pipe section, and the withdrawn pipe section is removed.

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