A sealing device for the exhaust port of a tunnel steel formwork trolley

Abstract

This utility model discloses a sealing device for the vent hole of a tunnel steel formwork trolley, comprising: a cylindrical rubber plug, a circular steel plate, fastening bolts, a steel plate, nuts, and a screw. One end of the cylindrical rubber plug is fixedly connected to one end of the steel plate, and the other end of the cylindrical rubber plug mates with the inner wall of the circular steel plate. A screw hole is provided on the side of the cylindrical rubber plug. The end of the circular steel plate is fixedly connected to the outer side of the steel panel of the lining trolley. The fastening bolt passes sequentially through the side wall of the circular steel plate and the cylindrical rubber plug, and mates with the screw hole on the side of the cylindrical rubber plug. A screw is provided at the other end of the steel plate, and the screw passes through the steel plate and is fixedly connected to the steel plate and the steel panel of the lining trolley via several nuts. This utility model can effectively ensure the compactness of the concrete pouring for the tunnel arch and the appearance quality of the lining, improve construction efficiency, reduce construction costs, and is applicable to tunnel lining construction of different specifications and cross-sectional types, possessing high application value.

Description

Technical Field

[0001] This utility model belongs to the field of municipal engineering construction technology, specifically relating to a sealing device for the exhaust port of a tunnel steel formwork trolley. Background Technology

[0002] In tunnel lining construction in fields such as water conservancy and hydropower, highways, and municipal engineering, the concrete pouring of the crown arch is a crucial process for ensuring the structural strength and durability of the tunnel. Because the crown arch is located at the highest point of the tunnel cross-section, defects such as air bubbles and voids are easily formed during concrete pouring due to the inability to expel internal air in a timely manner, severely affecting the quality of the concrete pouring. Furthermore, the sealing quality of the grouting pipes reserved for subsequent repair of defects in the crown arch concrete, as well as the side venting pipes installed for air expulsion, directly affects the overall density and aesthetic appearance of the crown arch concrete after they have fulfilled their respective functions.

[0003] The commonly used methods for sealing vents in the industry currently have the following problems: First, the method of manually filling cement mortar or rubber plugs is inefficient and prone to leakage during concrete pouring due to loose filling, which can lead to quality problems such as voids in the top arch and honeycomb pitting on the lining surface; Second, most existing sealing devices do not consider integration and compatibility with steel formwork trolleys. Therefore, it is urgent to add a simple, low-cost, easy-to-operate, and highly adaptable auxiliary sealing device to the existing steel formwork trolley to ensure that the vent holes and grouting holes can be closed in a timely and reliable manner after the top arch concrete is sealed, effectively preventing the top arch from becoming void due to grout leakage, while ensuring the flatness of the lining surface and improving the quality and efficiency of tunnel lining construction. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an auxiliary sealing device that is simple in structure, low in cost, easy to operate and highly adaptable, so as to ensure that the vent hole and grouting hole can be closed in a timely and reliable manner after the top arch concrete is sealed, effectively preventing the top arch from falling off due to grout leakage, while ensuring the flatness of the lining surface and improving the construction quality and efficiency of tunnel lining.

[0005] The technical solution of this utility model is as follows: A sealing device for the vent of a tunnel steel formwork trolley includes: a cylindrical rubber plug, a circular steel plate, fastening bolts, a steel plate, nuts, and a screw. One end of the cylindrical rubber plug is fixedly connected to one end of the steel plate, and the other end of the cylindrical rubber plug mates with the inner wall of the circular steel plate. A screw hole is provided on the side of the cylindrical rubber plug. The end of the circular steel plate is fixedly connected to the outer side of the steel panel of the lining trolley. The fastening bolt passes through the side wall of the circular steel plate and the cylindrical rubber plug in sequence and mates with the screw hole on the side of the cylindrical rubber plug. A screw is provided at the other end of the steel plate. The screw passes through the steel plate and is fixedly connected to the steel plate and the steel panel of the lining trolley through several nuts.

[0006] Furthermore, the diameter of the cylindrical rubber plug is adapted to the inner diameter of the vent hole, and the diameter of the cylindrical rubber plug is in the range of 50mm-100mm, and the height of the cylindrical rubber plug is 50mm-80mm.

[0007] Furthermore, the thickness of the circular steel plate is 3mm, its inner diameter is 5mm-10mm larger than the inner diameter of the vent hole, its outer diameter is 20mm-30mm larger than the inner diameter, and the side wall of the circular steel plate is evenly provided with 4 mounting holes with a diameter of 8mm; the fastening bolt passes through any mounting hole on the side wall of the circular steel plate and fixes the cylindrical rubber plug inside the circular steel plate through the fastening nut.

[0008] Furthermore, a flat washer is provided between the steel plate and the nut, and a flat washer is provided between the nut and the steel panel of the lining trolley.

[0009] Furthermore, the diameter of the screw is 12mm-16mm, the length is 100mm-200mm, and the length of the external thread on the screw body is not less than 30mm.

[0010] The beneficial effects of this utility model are: 1. Double fixation for high stability: The combination of fastening bolts and circular steel plate effectively restricts the circumferential rotation and radial displacement of the rubber plug; the combination of screw, steel plate and nut applies axial preload. This structure can effectively resist the impact force during high-pressure grouting or concrete pouring, prevent the sealing device from loosening and falling off, and completely solve the problem that traditional sealing methods are easily blown open.

[0011] 2. Good sealing performance and prevention of grout leakage: The steel plate is pulled by the screw to press the cylindrical rubber plug. The elastic deformation characteristics of the rubber material make the plug body form an interference fit with the vent hole wall and the trolley panel. With the use of flat washers, the sealing performance of the connection is further enhanced, effectively preventing concrete grout leakage and ensuring the flatness and aesthetics of the lining surface.

[0012] 3. Flexible structure and strong adaptability: The diameter and height of the cylindrical rubber plug are adjustable to accommodate vent holes of different diameters; the circular steel plate has 4 evenly distributed mounting holes, which means that the rubber plug does not need to be aligned with extremely high precision when it is installed. It can be laterally fixed by simply aligning it with any one of the holes, which greatly reduces the difficulty of on-site installation; the design of the screw length and thread length allows the device to adapt to trolley panels of different thicknesses and installation gaps.

[0013] 4. Easy to assemble and disassemble, and low cost: The main components of the device (steel plate, screw, nut) are all standard parts or simple processed parts, which are inexpensive and have high strength. After construction, the device can be quickly disassembled by simply loosening the nuts and tightening the bolts. Except for the rubber plug, which is a consumable, the rest of the metal parts can be reused, which significantly reduces long-term construction costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a tunnel steel formwork trolley exhaust port sealing device in a closed state.

[0015] Figure 2 This is a schematic diagram of the structure of a tunnel steel formwork trolley exhaust hole sealing device in the open state.

[0016] In the diagram: 1- Lining trolley steel panel, 2- Cylindrical rubber plug, 3- Circular steel plate, 4- Fastening bolt, 5- Steel plate, 6- Nut, 7- Screw. Detailed Implementation

[0017] like Figure 1-2 As shown, this embodiment provides a sealing device for the vent hole of a tunnel steel formwork trolley, mainly composed of a lining trolley steel panel 1, a cylindrical rubber plug 2, a circular steel plate 3, fastening bolts 4, a steel plate 5, a nut 6, and a screw 7. The circular steel plate 3 is fixed to the outside of the lining trolley steel panel 1, and its thickness is preferably 3mm. The inner diameter is designed to be 5mm-10mm larger than the inner diameter of the vent hole, and the outer diameter is 20mm-30mm larger than the inner diameter to ensure sufficient welding or fixing area. Four mounting holes with a diameter of 8mm are evenly opened on the side wall of the circular steel plate 3 for installing lateral fasteners. The cylindrical rubber plug 2 is located inside the circular steel plate 3, and its diameter is adapted to the inner diameter of the vent hole (50mm-100mm), and its height is 50mm-80mm. The side of the plug body has a pre-reserved screw hole for mating with the fastening bolt 4. The steel plate 5 is set at one end of the cylindrical rubber plug 2 and is attached to it. The fixed connection serves as the main load-bearing component. The fastening bolt 4 passes through any mounting hole on the side wall of the annular steel plate 3 and is screwed into the threaded hole on the side of the cylindrical rubber plug 2. By tightening the fastening bolt 4, the rubber plug is locked horizontally within the annular steel plate 3, preventing rotation or displacement under grouting pressure. The screw 7 is made of Q235 steel bar with a diameter of 12mm-16mm and a length of 100mm-200mm, and the external thread length is not less than 30mm. One end of the screw 7 is connected to the steel plate 5, and the other end passes through the steel plate 5 and extends to the steel panel 1 of the lining trolley. Several nuts 6 are screwed in to longitudinally tighten and fix the steel plate 5 and the steel panel 1 of the lining trolley. Flat washers are provided between the steel plate 5 and the nuts, and between the nuts 6 and the steel panel 1 of the lining trolley, to increase the contact area and prevent stress concentration from causing loosening of the connection.

[0018] In use, the cylindrical rubber plug 2, the annular steel plate 3, and the steel plate 5 are machined according to the size of the vent hole. The annular steel plate 3 is welded and fixed to the outside of the vent hole of the steel panel 1 of the lining trolley to ensure concentricity. The steel plate 5 is pre-fixed to the top of the cylindrical rubber plug 2. The rubber plug 2 is pushed into the annular steel plate 3, and the angle is adjusted so that the screw hole on the side of the rubber plug is aligned with the mounting hole on the side wall of the annular steel plate 3. The fastening bolt 4 is screwed in to connect the annular steel plate 3 and the cylindrical rubber plug 2, completing the initial positioning. The screw 7 is passed through the steel plate 5, and the nut 6 and flat washer are used to tighten the nut forcefully. 6; The axial tensile force generated by nut 6 is transmitted to steel plate 5 through screw 7, which in turn presses the cylindrical rubber plug 2, causing it to undergo slight elastic deformation, tightly filling the vent hole and completing the sealing; After the concrete has initially set (usually 4-6 hours after pouring), use a wrench to loosen nut 6, remove screw 7, steel plate 5, fastening bolt 4 and cylindrical rubber plug 2, leaving only the ring steel plate 3 fixed on the steel panel 1 of the lining trolley. The disassembled parts can be cleaned and maintained, making them easy to reuse in the next construction cycle. Only the worn rubber parts need to be replaced.

[0019] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this utility model.

Claims

1. A tunnel steel form jumbo exhaust hole plugging device, characterized in that, include: The cylindrical rubber plug (2), the annular steel plate (3), the fastening bolt (4), the steel plate (5), the nut (6) and the screw (7) are provided. One end of the cylindrical rubber plug (2) is fixedly connected to one end of the steel plate (5), and the other end of the cylindrical rubber plug (2) is fitted with the inner wall of the annular steel plate (3). The cylindrical rubber plug (2) has a screw hole on its side. The end of the annular steel plate (3) is fixedly connected to the outer side of the lining trolley steel panel (1). The fastening bolt (4) passes through the side wall of the annular steel plate (3) and the cylindrical rubber plug (2) in sequence and fits with the screw hole on the side of the cylindrical rubber plug (2). The other end of the steel plate (5) is provided with a screw (7). The screw (7) passes through the steel plate (5) and is fixedly connected to the steel plate (5) and the lining trolley steel panel (1) by several nuts (6).

2. The device according to claim 1, characterized in that, The diameter of the cylindrical rubber plug (2) is adapted to the inner diameter of the vent hole. The diameter range of the cylindrical rubber plug (2) is 50mm-100mm, and the height of the cylindrical rubber plug (2) is 50mm-80mm.

3. The device according to claim 1, wherein, The thickness of the circular steel plate (3) is 3mm, its inner diameter is 5mm-10mm larger than the inner diameter of the exhaust hole, and its outer diameter is 20mm-30mm larger than the inner diameter. The side wall of the circular steel plate (3) is evenly provided with 4 mounting holes with a diameter of 8mm. The fastening bolt (4) passes through any mounting hole on the side wall of the circular steel plate (3) and fixes the cylindrical rubber plug (2) in the circular steel plate (3) through the fastening nut.

4. The device according to claim 1, wherein, A flat washer is provided between the steel plate (5) and the nut (6), and a flat washer is provided between the nut (6) and the steel panel (1) of the lining trolley.

5. The device according to claim 1, wherein The screw (7) has a diameter of 12mm-16mm, a length of 100mm-200mm, and an external thread length of not less than 30mm.

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