A sealing device for the grouting port of a tunnel lining trolley arch.

Abstract

This utility model relates to the technical field of tunnel construction equipment, specifically a sealing device for the grouting port of a tunnel lining trolley arch. It includes a sealing window, a vertical rotating shaft, a bearing, a horizontal rotating shaft, and a hydraulic jack. The sealing window is made of high-strength ultra-thin steel plate and is located inside the trolley template. The bearing is mounted on the trolley template, and the upper end of the vertical rotating shaft passes through a through-hole in the bearing and connects to the sealing window. The vertical rotating shaft is rotatably connected relative to the trolley template via the bearing. The lower end of the vertical rotating shaft is connected to one end of the horizontal rotating shaft, and the other end of the horizontal rotating shaft is rotatably connected to the telescopic end of the hydraulic jack via a hinge. The hydraulic jack is fixed to the trolley crossbeam base. This device completely eliminates the risk of arch voids, avoids the concrete protrusions and grinding processes caused by traditional sealing methods, and also avoids the problem of cement slurry jamming the mechanism.

Description

Technical Field

[0001] This utility model relates to the technical field of tunnel construction equipment, specifically a sealing device for the grouting port of the tunnel lining trolley arch. Background Technology

[0002] The physical and aesthetic quality of tunnel secondary lining construction is of paramount importance, especially when the secondary lining reaches the arch crown. Sealing the pump pipe hole is the final step in the process, and its quality directly affects the physical and aesthetic quality of the secondary lining arch crown grouting inlet. Failure to achieve the desired sealing quality can lead to two problems:

[0003] 1. When the pumping of concrete is terminated, there is a certain height difference between the newly pumped concrete and the lower concrete, which causes the concrete at the lining trolley grouting port to fall. There are certain gaps between the concrete and the waterproof membrane during construction, resulting in the secondary lining arch becoming void. After non-destructive testing, the voided area needs to be grouted. In severe cases, the lining may even need to be removed and reworked, which greatly increases the construction risk and cost.

[0004] 2. Currently, the sealing device for lining construction is set below the trolley panel and inside the formwork. In this case, after the concrete is poured, a protruding cylinder will be formed. When the trolley moves, it will damage the appearance of the secondary lining at the pouring port, affecting the appearance quality of the secondary lining. The subsequent grinding work is more arduous and increases costs.

[0005] Even more seriously, the existing sliding sealing mechanism relies on the guide of the slot, and cement slurry can easily seep into the gap of the slot and solidify, causing the sealing plate to jam and fail. It needs to be disassembled and cleaned every 10 rings, which seriously restricts the continuity of construction.

[0006] Therefore, how to develop a grouting port sealing device that can simultaneously solve the problems of arch voids and appearance damage, and avoid mechanical jamming, has become a technical bottleneck that urgently needs to be overcome in the field of tunnel lining engineering. Utility Model Content

[0007] The purpose of this utility model is to provide a sealing device for the grouting port of the tunnel lining trolley arch, so as to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a sealing device for the grouting port of a tunnel lining trolley arch, comprising a sealing window, a vertical rotating shaft, a bearing, a horizontal rotating shaft, and a hydraulic jack. The sealing window is made of high-strength ultra-thin steel plate and is located inside the trolley template. The bearing is installed on the trolley template, and the upper end of the vertical rotating shaft passes through the through hole of the bearing and is connected to the sealing window. The vertical rotating shaft is rotatably connected relative to the trolley template via the bearing. The lower end of the vertical rotating shaft is connected to one end of the horizontal rotating shaft, and the other end of the horizontal rotating shaft is rotatably connected to the telescopic end of the hydraulic jack via a hinge. The hydraulic jack is fixed on the trolley crossbeam base.

[0009] Preferably, when the sealing window is closed, its outer surface is coplanar with the working surface of the trolley template.

[0010] Preferably, the circumferential edge of the sealing window is provided with a cutting edge, the angle of which is 30°-45°.

[0011] Preferably, the sealing window is circular or rectangular.

[0012] Compared with existing technologies, this utility model provides a sealing device for the grouting port of the tunnel lining trolley arch, which has the following beneficial effects: This utility model achieves a triple breakthrough through the synergistic innovation of ultra-thin sealing window and rotary locking mechanism: First, the sealing window is designed to be coplanar with the template when closed, making the surface of the grouting port flat and without protrusions, completely eliminating the need for subsequent grinding, significantly improving the appearance quality of the lining and reducing construction costs; Second, during the hydraulically driven rotation and downward pressing of the sealing window, its circumferential cutting edge cuts the freshly poured concrete at the optimal inclination angle of 30°-45° to form a sealed interface, effectively blocking the concrete backflow path and fundamentally eliminating the hidden danger of arch voids; Third, the adoption of a trackless rotary locking mechanism avoids the problem of mechanism jamming caused by cement slurry intrusion, greatly improving the durability of the device and the continuity of construction. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 for Figure 1 An enlarged bottom view of point A in the middle;

[0015] Figure 3 This is a schematic diagram of a sealing window structure.

[0016] Explanation of reference numerals in the attached diagram: 1. Sealing window; 2. Vertical rotation axis; 3. Bearing; 4. Horizontal rotation axis; 5. Hydraulic jack; 6. Hinge; 7. Template; 8. Crossbeam base; 9. Injection port; 10. Cutting edge. Detailed Implementation

[0017] The technical solutions of the present utility model will now be described with reference to the accompanying drawings in the embodiments of the present utility model:

[0018] like Figure 1-3 As shown, this utility model provides a sealing device for the grouting port of the tunnel lining trolley arch, including a sealing window 1, a vertical rotating shaft 2, a bearing 3, a horizontal rotating shaft 4, and a hydraulic jack 5.

[0019] The sealing window 1 is circular or rectangular, made of high-strength ultra-thin steel plate with a thickness of 3-5mm and an area of ​​0.02-0.07m². 2 The sealing window 1 has a cutting edge 10 on its circumferential edge, with an angle α of 30°-45°. When closed, the cutting edge 10 cuts through the concrete to form a sealing interface. The sealing window 1 is located inside the trolley formwork 7, and its size and shape (circular or rectangular) must precisely match the contour of the pouring port 9. When the sealing window 1 is closed, its outer surface is coplanar with the working surface of the trolley formwork 7, ensuring that there are no protrusions on the surface of the pouring port. The bearing 3 is installed on the trolley template 7. The bearing 3 is firmly embedded in the preset position of the trolley template 7. Its through hole axis is perpendicular to the working surface of the template 7. The bearing 3 provides the rotation fulcrum of the sealing window to reduce frictional resistance. The upper end of the vertical rotating shaft 2 passes through the through hole of the bearing 3 and is welded to the sealing window 1 to ensure that the sealing window 1 can rotate synchronously with the shaft. The vertical rotating shaft 2 is rotatably connected to the trolley template 7 through the bearing 3. The lower end of the vertical rotating shaft 2 is connected to one end of the horizontal rotating shaft 4. The other end of the horizontal rotating shaft 4 is rotatably connected to the telescopic end of the hydraulic oil top 5 through the hinge 6. The hydraulic oil top 5 is fixed on the trolley crossbeam base 8.

[0020] Implementation process of this device:

[0021] 1. Initial State (Preparation for Pouring): Before the concrete pouring operation begins, the hydraulic jack 5 is retracted, pulling the horizontal rotating shaft 4 via the hinge 6. The horizontal rotating shaft 4 then drives the vertical rotating shaft 2 to rotate counterclockwise around the axis of the bearing 3. This rotational action drives the rigidly connected sealing window 1 to rotate counterclockwise synchronously, completely moving it away from the position of the pouring port 9 and stably retracting it above the inner side of the formwork 7. At this time, the pouring port 9 area is completely open and unobstructed, creating conditions for the smooth insertion of the concrete pump pipe and the smooth injection of concrete.

[0022] 2. Concrete Pouring Operation: Accurately insert the end of the concrete pump pipe into the fully open pouring port 9. Start the concrete pumping equipment; under pump pressure, concrete is continuously and stably injected into the sealed cavity formed by the trolley formwork 7 through the pouring port 9. The pouring operation must continue until the concrete completely fills the entire lining contour, especially the arch area, ensuring that the concrete around and above the pouring port 9 is fully and densely filled, without voids or segregation. Operators must closely monitor the pouring height and flowability of the concrete.

[0023] 3. Locking Operation: Once it is confirmed that the concrete in the arch area has been poured to full and reached the predetermined elevation, the sealing procedure can be initiated. The hydraulic jack 5 is activated to push the telescopic end outwards smoothly and at a uniform speed, sequentially driving the horizontal rotating shaft 4 and the vertical rotating shaft 2 to rotate synchronously clockwise. The rotation of the vertical rotating shaft 2 causes the sealing window 1 to rotate clockwise around the bearing 3 and fall. During the rotation and fall, the pre-set cutting edge on the circumferential edge of the sealing window 1 begins to contact and cut into the newly poured, yet-to-set concrete at the pouring port 9 at a 35° angle. This cutting process is not a simple vertical downward press, but a combined motion of rotational shearing and pressing against the formwork 7.

[0024] The working principle of the cutting edge: The specific angled cutting edge design (rather than a 90° right angle edge) has significant advantages. On the one hand, the sharp cutting edge reduces cutting resistance; on the other hand, its tilt angle can more effectively cut the concrete flow circumferentially during the rotating downward pressing process, forming a gradually closing sealing interface, rather than a rigid compression. This greatly reduces the risk of the concrete being pushed as a whole or the formation of internal disturbance voids. At the same time, the gravity of the concrete itself also helps in the falling and compaction process of the sealing window 1.

[0025] 4. Sealing Formation: The hydraulic jack 5 extends continuously, pushing the sealing window 1 to continue rotating clockwise and eventually completely covering the injection port 9. When the hydraulic jack 5 reaches its end point (maximum extension position), the outer surface of the sealing window 1 is completely flush with (coplanar) the working surface of the trolley template 7. This is a key design to eliminate later protrusions and ensures a smooth transition of the inner surface of the secondary lining arch.

[0026] Sealing interface completed: At the end of the rotation and compaction, the circumferential cutting edge of the sealing window 1 has formed a complete, dense, and gapless annular cutting seal between its edge and the concrete around the injection port 9. This interface "cut" out by the cutting edge effectively blocks any possible path for concrete to flow back down through the injection port 9, fundamentally eliminating the phenomenon of arch voids caused by backflow.

[0027] After locking is completed, the concrete pump pipe can be removed. The hydraulic jack 5 remains extended to maintain the sealing pressure until the concrete reaches sufficient strength.

[0028] 5. Demolding and maintenance: After the lining has initially set, it shrinks and detaches from the template 7. The hydraulic jack 5 retracts and resets in the opposite direction. The retraction end of the hydraulic jack 5 pulls the horizontal rotating shaft 4 through the hinge 6, driving the vertical rotating shaft 2 to rotate counterclockwise around the axis of the bearing 3, thereby causing the sealing window 1 to rotate counterclockwise synchronously, so that it can open smoothly and detach from the hardened lining surface.

[0029] Residue Removal: When the sealing window 1 closes, its cutting edge cuts into the concrete to form a seal. After opening, a very thin layer of concrete residue may adhere to the cutting edge. Because the sealing window 1 is made of ultra-thin steel plate (3-5mm thick) and has a sharp cutting edge, this residue is usually very thin and poorly adhered. Operators can easily and quickly remove it completely using simple tools. The cleaning process is simple and efficient, will not damage the functional surfaces of the sealing window 1, and will not affect the normal operation of the device in the next lining cycle.

[0030] The advantage of being jam-free is evident: the entire opening and closing process relies entirely on the rotating bearing 3 and the hinge 6, completely eliminating the need for traditional sliding guide rails or slot structures. Even if cement slurry splashes onto the rotating shaft or bearing, because these components are in continuous rotational motion and lack narrow, sealed sliding gaps, the cement slurry cannot effectively penetrate and solidify, preventing jamming. Even if a small amount adheres, it is easily scraped off or broken during the opening and closing process. This significantly reduces maintenance frequency, ensuring the continuity of construction and the reliability of the equipment.

[0031] The beneficial effects of this utility model are:

[0032] 1. The sealing window is made of high-strength steel plate and is closely fitted to the secondary lining trolley.

[0033] 2. The steel plate only needs to support the weight of the concrete. After removal, it will not have the protruding cylindrical part that requires manual grinding, unlike traditional methods of blocking the exit.

[0034] 3. At the same time, it will not cause concrete to flow back under gravity, resulting in local voids near the injection port.

[0035] 4. Traditionally, the steel plate used for sealing the injection port moves back and forth along a fixed groove to seal it, but cement slurry can flow into the groove, affecting its use.

[0036] The above embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A device for closing a crown pouring hole of a tunnel lining jumbo, characterized in that: The assembly includes a sealing window (1), a vertical rotating shaft (2), a bearing (3), a horizontal rotating shaft (4), and a hydraulic jack (5). The sealing window (1) is made of high-strength ultra-thin steel plate and is located on the inner side of the trolley template (7). The bearing (3) is installed on the trolley template (7), and the upper end of the vertical rotating shaft (2) passes through the through hole of the bearing (3) and is connected to the sealing window (1). The vertical rotating shaft (2) is rotatably connected to the trolley template (7) through the bearing (3). The lower end of the vertical rotating shaft (2) is connected to one end of the horizontal rotating shaft (4), and the other end of the horizontal rotating shaft (4) is rotatably connected to the telescopic end of the hydraulic jack (5) through a hinge (6). The hydraulic jack (5) is fixed on the trolley beam base (8).

2. A tunnel lining trolley springline closure device according to claim 1, characterised in that: When the sealing window (1) is closed, its outer surface is coplanar with the working surface of the trolley template (7).

3. The tunnel lining jumbo crown pour portal closure device of claim 1, wherein: The sealing window (1) has a cutting edge (10) on its circumferential edge, and the angle of the cutting edge (10) is 30°-45°.

4. The tunnel lining jumbo crown pour portal closure device of claim 1, wherein: The sealing window (1) is circular or rectangular.

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