Emergency built-in intermediate jacking station device for large-diameter concrete pipe jacking

Abstract

The utility model relates to the field of municipal engineering pipe jacking construction, in particular to a large-diameter concrete pipe jacking emergency built-in intermediate jacking station device. The emergency built-in intermediate jacking station device for large-diameter concrete pipe jacking comprises a front inner supporting ring, a water stop pressing ring, an outer check ring, an outer sealing flange, an inner check ring, an inner sealing flange, an inner friction ring, a limiting flange and a rear inner supporting ring which are sequentially arranged in the axial direction of a pipeline, and intermediate jacking station jacks annularly and evenly distributed between the front inner supporting ring and the rear inner supporting ring. The front inner supporting ring and the rear inner supporting ring are attached to the inner walls of the front concrete pipe joint and the rear concrete pipe joint respectively, the outer sealing flange is connected with the rear end of the front inner supporting ring, and the inner friction ring is connected with the front end of the rear inner supporting ring. The large-diameter concrete pipe jacking emergency built-in intermediate jacking station device can be rapidly assembled in a pipeline through a built-in structure, extra vertical shaft excavation is not needed, the large-diameter concrete pipe jacking emergency built-in intermediate jacking station device is suitable for emergency rescue of urban dense areas, and the construction period is greatly shortened compared with a traditional scheme.

Description

Technical Field

[0001] This utility model relates to the field of municipal engineering pipe jacking construction, and in particular to an emergency built-in relay station device for large-diameter concrete pipe jacking. Background Technology

[0002] Currently, pipe jacking technology is widely used in pipeline construction in China. With increasing construction demands, it has been continuously developing towards larger diameters and longer jacking distances in recent years. Due to the limitations of pipe jacking technology, the overall jacking resistance increases with the jacking distance. During construction, improper resistance reduction measures, unconservative arrangement of intermediate stations, or leakage and failure of existing intermediate stations, among other special circumstances, can easily cause the pipeline to seize up, making further jacking impossible. The traditional solution is to excavate a turning shaft at the jacking head and re-lay out the shaft for jacking. However, with urbanization, dense urban buildings and heavy road traffic are no longer suitable for this traditional solution. Therefore, the solution of adding internal intermediate stations within large-diameter concrete pipe jacking pipelines and segmented jacking is increasingly being adopted.

[0003] A utility model patent with Chinese patent authorization announcement number "CN222026412U" discloses a detachable relay station structure for pipe jacking, including a front pipe, a rear pipe fitted inside the cavity of the front pipe, and a jack unit disposed inside the cavities of the front and rear pipes. An end-face sealing jacket is provided at the joint surface of the front and rear pipes, and two sets of jacket tensioning mechanisms are installed inside the end-face sealing jacket; the jacket tensioning mechanism includes an intermediate block. This utility model installs an end-face sealing jacket at the joint of the front and rear pipes, and installs a tensioning mechanism inside the end-face sealing jacket. The movable rod in the tensioning mechanism, moving within the hollow pipe, is tensioned by a return spring, causing the movable rod to expand the end-face sealing jacket from the inside. When the end-face sealing jacket is expanded, the rubber sealing ring on its outer surface tightly adheres to the joint of the front and rear pipes. Multiple sets of expanded rubber sealing rings prevent mud and water from seeping into the pipe during the pipe jacking process.

[0004] Regarding the aforementioned technologies, the inventors believe that the key technical point of the above-mentioned utility model is to install a steel structure built-in relay chamber on two adjacent pipe sections. The front and rear support rings of the relay chamber are connected to the pipe wall with bolts, and a jack is arranged in the middle to allow the stuck jacking pipe to be released in time. However, the water sealing of the relay chamber relies entirely on the water-sealing rubber ring of the pipe section. The water-sealing rubber ring of the pipe section is prone to failure due to repeated sliding friction, resulting in leakage. Moreover, the relay chamber has no limit on the movement of the travel device, and the two pipe sections are prone to detachment, resulting in a collapse accident.

[0005] Therefore, it is necessary to provide a new emergency built-in relay station device for large-diameter concrete pipe jacking to solve the above-mentioned technical problems. Utility Model Content

[0006] To overcome the shortcomings of existing technologies, an emergency built-in relay station device for large-diameter concrete pipe jacking is provided to solve the above-mentioned problems.

[0007] The emergency built-in relay station device for large-diameter concrete pipe jacking provided by this utility model includes: a front inner support ring, a water-stop pressure ring, an outer retaining ring, an outer sealing flange, an inner retaining ring, an inner sealing flange, an inner friction ring, a limiting flange, and a rear inner support ring arranged sequentially along the pipe axis; and relay station jacks evenly distributed circumferentially between the front and rear inner support rings; the front and rear inner support rings are respectively fitted to the inner walls of the front and rear concrete pipe sections; the outer sealing flange is connected to the rear end of the front inner support ring; the inner friction ring is connected to the front end of the rear inner support ring; the relay station jacks are connected to the front and rear inner support rings through hydraulic cylinder clamps; and the limiting flange is set between the inner friction ring and the outer sealing flange to limit the stroke of the inner friction ring.

[0008] Preferably, the water-stop pressure ring, the outer retaining ring, and the outer sealing flange together constitute the external sealing structure, and the inner retaining ring and the inner sealing flange together constitute the internal sealing structure.

[0009] Preferably, the relay jack is uniformly fixed in the circumferential direction to the corresponding brackets of the front inner support ring and the rear inner support ring by hydraulic cylinder clamps.

[0010] Preferably, the limiting flange cooperates with the outer sealing flange to limit the stroke of the inner friction ring.

[0011] Preferably, the inner friction ring and the outer sealing flange cooperate to form a sliding telescopic structure, which can move axially under the action of the intermediate jack.

[0012] Preferably, the front inner support ring and the rear inner support ring are fixedly connected to the inner walls of the front and rear concrete pipe sections respectively by high-strength bolts.

[0013] Compared with related technologies, the emergency built-in relay station device for large-diameter concrete pipe jacking provided by this utility model has the following beneficial effects:

[0014] This invention allows for rapid assembly within pipelines via a built-in structure, eliminating the need for additional shaft excavation. It is suitable for emergency rescue in densely populated urban areas, significantly shortening the construction cycle compared to traditional solutions.

[0015] This utility model uses two rubber water-stop rings between the front inner support ring, the rear inner support ring and the pipe section, and three water-stop rings between the outer sealing flange and the inner friction ring. Combined with the water-stop pressure ring for emergency tightening, it forms a "double barrier + dynamic sealing" system that can withstand water and soil pressure and solves the leakage problem of traditional relay stations.

[0016] The limiting flange of this utility model limits the travel of the inner friction ring through the flange-groove cooperation, ensuring that at least one water-stop ring of the pipe section does not come off, thus avoiding the risk of pipe section separation and collapse caused by excessive expansion and contraction. Attached Figure Description

[0017] Figure 1 A schematic diagram of a preferred embodiment of the emergency built-in relay station device for large-diameter concrete pipe jacking provided by this utility model.

[0018] Figure 2 for Figure 1 The diagram shows the structure of the front inner support ring;

[0019] Figure 3 for Figure 1 The diagram shows the structure of the limiting flange.

[0020] Figure 4 for Figure 1 The diagram shows the structure of the hydraulic cylinder clamp.

[0021] The following are the labels in the diagram: 1. Front inner support ring; 2. Water-stop pressure ring; 3. Outer retaining ring; 4. Outer sealing flange; 5. Inner retaining ring; 6. Inner sealing flange; 7. Inner friction ring; 8. Intermediate jack; 9. Hydraulic cylinder clamp; 10. Limiting flange; 11. Rear inner support ring. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0023] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0024] This utility model provides an emergency built-in relay station device for large-diameter concrete pipe jacking. The device includes: a front inner support ring 1, a water-stop pressure ring 2, an outer retaining ring 3, an outer sealing flange 4, an inner retaining ring 5, an inner sealing flange 6, an inner friction ring 7, a limiting flange 10, and a rear inner support ring 11 arranged sequentially along the pipe axis; and relay station jacks 8 evenly distributed circumferentially between the front inner support ring 1 and the rear inner support ring 11. The front inner support ring 1 and the rear inner support ring 11 are respectively fitted to the inner walls of the front and rear concrete pipe sections. The outer sealing flange 4 is connected to the rear end of the front inner support ring 1, and the inner friction ring 7 is connected to the front end of the rear inner support ring 11. The relay station jacks 8 are connected to the front inner support ring 1 and the rear inner support ring 11 through a hydraulic cylinder clamp 9. The limiting flange 10 is disposed between the inner friction ring 7 and the outer sealing flange 4 to limit the stroke of the inner friction ring 7.

[0025] It should be noted that: the front inner support ring 1 is an annular plate structure that fits tightly against the inner wall of the front concrete pipe section. The water-stop pressure ring 2 is fitted onto the outside of the front inner support ring 1, working with the rubber water-stop ring to compress and seal, preventing mud leakage between the pipe section and the support ring. The outer retaining ring 3 is fixed to the outside of the outer sealing flange 4, together forming an external sealing structure to prevent external water and soil from entering the relay room. The inner retaining ring 5 is fixed to the inside of the inner sealing flange 6, forming an internal sealing system to prevent leakage of the internal medium in the relay room. The inner friction ring 7 is a cylindrical structure that connects to the front flange of the rear inner support ring 11, and its outer side slides against the inner wall of the outer sealing flange 4, forming a retractable dynamic sealing structure. The limiting flange 10 is set between the inner friction ring 7 and the outer sealing flange 4, and through the cooperation of the limiting flange and the groove, it limits the axial travel of the inner friction ring 7, avoiding excessive expansion and contraction that could lead to water-stop failure. The rear inner support ring 11 is an annular plate structure that fits against the inner wall of the rear concrete pipe section, and is fixed by high-strength bolts and chemical anchoring, serving as the rear support point of the jack 8. Sixteen jacks are evenly distributed around the circumference and are fixed to the brackets of the front inner support ring 1 and the rear inner support ring 11 by hydraulic cylinder clamps 9, providing jacking power.

[0026] In the embodiments of this utility model, the water-stop pressure ring 2, the outer retaining ring 3, and the outer sealing flange 4 together constitute the external sealing structure, and the inner retaining ring 5 and the inner sealing flange 6 together constitute the internal sealing structure.

[0027] It should be noted that: the water-stop pressure ring 2 is an annular plate, fitted onto the outer edge of the front inner support ring 1, forming a sealing cavity between it and the inner wall of the front concrete pipe section. Its main function is to compress the two O-ring rubber water-stop rings embedded in the circumferential groove of the front inner support ring 1. The water-stop pressure ring 2 is connected to the front inner support ring 1 by high-strength bolts evenly distributed along the circumference to apply pressure, ensuring that the water-stop rings fit tightly against the inner wall of the pipe section and preventing slurry leakage from the gap between the pipe section and the support ring. The outer retaining ring 3 is a circular metal plate, fixed to the outer periphery of the front end of the outer sealing flange 4, and the two are connected by welding or bolts to form a whole. The rear end of the outer sealing flange 4 is connected to the rear end flange of the front inner support ring 1 by 36 M20 high-strength bolts, and the inner wall of the front end is machined with an annular groove for embedding three O-ring rubber water-stop rings. The outer retaining ring 3 extends outward to form a flange, contacting the end face of the concrete pipe section, forming the first physical barrier to prevent external sandy soil, silty soil and groundwater from entering the outer gap of the intermediate section. The inner retaining ring 5 is installed inside the inner sealing flange 6, and is annular in shape. It is connected to the inner sealing flange 6 by bolts or integrally formed. Its function is to cooperate with the sealing groove at the front end of the rear inner support ring 11 to fix two O-ring rubber waterstops. This prevents mud leakage between the rear pipe section and the rear inner support ring 11. The inner edge of the inner retaining ring 5 is chamfered to facilitate the installation and positioning of the rubber waterstops, ensuring that the seal is wrinkle-free and does not shift after the bolts are tightened. The inner sealing flange 6 has a cylindrical structure. Its rear end is connected to the front flange of the rear inner support ring 11 by 72 M20 high-strength bolts, and its front inner wall slides against the outer side of the inner friction ring 7. The inner wall of the inner sealing flange 6 is provided with an annular boss, which cooperates with the groove on the outer side of the inner friction ring 7 to form a sliding sealing guide structure. Three O-ring rubber waterstops are embedded between the two. By tightening the water-stop pressure ring, it is ensured that the relative sliding surfaces of the inner friction ring 7 and the inner sealing flange 6 remain sealed during the expansion and contraction of the relay, thus preventing leakage of internal lubricating grease or mud when the jack 8 is working.

[0028] In an embodiment of this utility model, the intermediate jack 8 is uniformly fixed in the circumferential direction to the corresponding brackets of the front inner support ring 1 and the rear inner support ring 11 by the hydraulic cylinder clamp 9.

[0029] It should be noted that the intermediate jacks 8 are evenly spaced along the circumference of the pipeline to ensure that the jacking force is evenly transmitted to the preceding and following pipe sections. The axis of each jack is parallel to the pipeline axis to avoid structural stress concentration caused by eccentric loading. The hydraulic cylinder clamp 9 is a two-part annular metal component with an arc groove machined on the inner wall to match the jack cylinder body. The two halves of the clamp are connected by four sets of high-strength bolts, encircling the middle of the jack cylinder body to form a rigid fixation. Ear plates are provided on the outer side of the clamp, which are bolted to the brackets of the front inner support ring 1 and the rear inner support ring 11. Sixteen sets of bracket ear plates are evenly welded to the outer circumference of the front inner support ring 1 and the rear inner support ring 11, corresponding one-to-one with the jack placement positions. Bolt holes are opened on the ear plates for fixing the hydraulic cylinder clamp 9.

[0030] In an embodiment of this utility model, the limiting flange 10 cooperates with the outer sealing flange 4 to limit the stroke of the inner friction ring 7.

[0031] It should be noted that the limiting flange 10 is an annular component, consisting of two parts: a limiting flange and a limiting groove. The limiting flange is fixed to the inner rear wall of the outer sealing flange 4 and is an annular protrusion. The limiting groove is located on the outer front wall of the inner friction ring 7 and matches the limiting flange. The inner friction ring 7 and the outer sealing flange 4 are in a sleeve structure, and the inner friction ring 7 can slide along the pipeline axial direction. When the jack 8 pushes the inner friction ring 7 backward, the front end face of the limiting groove contacts the rear end face of the limiting flange of the outer sealing flange 4, forming a mechanical limit and preventing the inner friction ring 7 from moving further.

[0032] In an embodiment of this utility model, the inner friction ring 7 and the outer sealing flange 4 cooperate to form a sliding telescopic structure, which can move axially under the action of the intermediate jack 8.

[0033] It should be noted that: the inner friction ring 7 is a cylindrical structure with an inwardly tapered rear end, and its rear outer circumference is fitted with a flange, which is connected to the inner sealing flange 6 at the front end of the rear inner support ring 11 by high-strength bolts. An annular guide boss is machined on the outer wall of the front end, and a spiral oil groove is formed on the surface of the boss to store grease and reduce sliding friction with the outer sealing flange 4. The outer sealing flange 4 is a cylindrical structure with an outwardly expanding front end, and its front outer circumference flange is connected to the rear end of the front inner support ring 1 by high-strength bolts; an annular guide groove is provided on the inner wall of the rear end, which cooperates with the guide boss of the inner friction ring 7 to ensure smooth axial movement and accurate radial positioning. The guide boss of the inner friction ring 7 is embedded in the guide groove of the outer sealing flange 4, forming an axially sliding and radially limited sleeve structure. Under the thrust of the intermediate jack 8, the inner friction ring 7 subsequently moves axially with the inner support ring 11, and the guide boss slides within the groove. The grease in the oil groove is continuously replenished through the oil injection hole, forming a dynamic lubricating film, reducing the coefficient of friction and minimizing component wear.

[0034] In the embodiments of this utility model, the front inner support ring 1 and the rear inner support ring 11 are fixedly connected to the inner walls of the front and rear concrete pipe sections respectively by high-strength bolts.

[0035] It should be noted that both the front inner support ring 1 and the rear inner support ring 11 are annular plate structures with their inner diameter fitting the inner wall of the concrete pipe section and their outer diameter being slightly smaller than the inner diameter of the pipe section.

[0036] The working principle of the emergency built-in relay station device for large-diameter concrete pipe jacking provided by this utility model is as follows: When insufficient jacking force or pipe seizure occurs during pipe jacking construction, the front inner support ring 1 and the rear inner support ring 11 are first fixed to the inner walls of the front and rear concrete pipe sections with chemical anchoring using high-strength bolts to form a rigid support foundation. Then, the external sealing structure consisting of a water-stop pressure ring 2, an outer retaining ring 3, and an outer sealing flange 4, and the internal sealing structure consisting of an inner retaining ring 5 and an inner sealing flange 6 are assembled. An O-ring rubber water-stop ring is embedded and pressed to block the path of mud leakage. At the same time, multiple relay station jacks 8 are circumferentially fixed to the corresponding brackets of the front and rear support rings through hydraulic cylinder clamps 9. The front end of the jack piston rod pushes the outer sealing flange 4, and the rear end is fixed to the rear inner support ring 11. During jacking, the hydraulic system drives the jacks to extend synchronously, pushing the outer sealing flange 4 and the... The inner friction ring 7 slides relative to each other, forming an axial jacking force of "push forward and pull back", which is transmitted to the front and rear pipe sections in segments. The sliding interface between the inner friction ring 7 and the outer sealing flange 4 is dynamically sealed by three water-stop rings and grease filled by the oil injection hole. The precise fit between the guide boss and the groove ensures smooth sliding. When the inner friction ring 7 slides to the limit position of the limiting flange 10, the limiting flange abuts against the groove to limit the stroke and ensure that at least one water-stop ring of the pipe section does not come off. If a slight leakage occurs, the water-stop ring can be further tightened by tightening the water-stop pressure ring 2 bolt. The continuous injection of grease into the oil injection hole can lubricate the sliding interface and prevent sand from entering, thus avoiding stroke failure. After the single-stage jacking stroke reaches the limit length, the jack piston rod is retracted and the extension and retraction action is repeated until the pipe is freed. After the jacking pipe is completed, the device is removed and the integrity of the pipe is restored by grouting.

[0037] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An emergency built-in relay station device for large-diameter concrete pipe jacking, characterized in that, include: The pipeline is arranged in sequence along the pipeline axis as follows: front inner support ring (1), water-stop pressure ring (2), outer retaining ring (3), outer sealing flange (4), inner retaining ring (5), inner sealing flange (6), inner friction ring (7), limiting flange (10), and rear inner support ring (11), as well as intermediate jacks (8) evenly distributed circumferentially between the front inner support ring (1) and the rear inner support ring (11); the front inner support ring (1) and the rear inner support ring (11) are respectively attached to the inner walls of the front and rear concrete pipe sections; the outer sealing flange (4) is connected to the rear end of the front inner support ring (1); the inner friction ring (7) is connected to the front end of the rear inner support ring (11); the intermediate jacks (8) are connected to the front inner support ring (1) and the rear inner support ring (11) through hydraulic cylinder clamps (9); the limiting flange (10) is set between the inner friction ring (7) and the outer sealing flange (4) to limit the stroke of the inner friction ring (7).

2. The emergency built-in relay station device for large-diameter concrete pipe jacking according to claim 1, characterized in that, The water-stop pressure ring (2), outer retaining ring (3), and outer sealing flange (4) together constitute the external sealing structure, and the inner retaining ring (5) and inner sealing flange (6) together constitute the internal sealing structure.

3. The emergency built-in relay station device for large-diameter concrete pipe jacking according to claim 2, characterized in that, The intermediate jack (8) is uniformly fixed in the circumferential direction to the corresponding brackets of the front inner support ring (1) and the rear inner support ring (11) by the hydraulic cylinder clamp (9).

4. The emergency built-in relay station device for large-diameter concrete pipe jacking according to claim 3, characterized in that, The limiting flange (10) cooperates with the outer sealing flange (4) to limit the stroke of the inner friction ring (7).

5. The emergency built-in relay station device for large-diameter concrete pipe jacking according to claim 4, characterized in that, The inner friction ring (7) and the outer sealing flange (4) cooperate to form a sliding telescopic structure, which can move axially under the action of the intermediate jack (8).

6. The emergency built-in relay station device for large-diameter concrete pipe jacking according to claim 5, characterized in that, The front inner support ring (1) and the rear inner support ring (11) are fixedly connected to the inner walls of the front and rear concrete pipe sections respectively by high-strength bolts.

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