Sealing structure for rectangular jacking pipe starting portal

Abstract

The utility model discloses a sealing structure for a rectangular pipe jacking starting tunnel portal, which comprises an upper section sealing steel plate welded with a tunnel portal embedded steel ring and a lower section sealing steel plate welded with the outer end face of a tail end pipe section, and the upper section sealing steel plate and the lower section sealing steel plate are connected through a welding seam. Each of the upper-section sealing steel plate and the lower-section sealing steel plate is formed by welding a plurality of blocks which are arranged side by side left and right, the lower-section sealing steel plate is welded on the outer end surface of the tail-end pipe section before sealing construction, and the upper-section sealing steel plate blocks are overlapped on the outer side surface of the lower-section sealing steel plate and are connected with the corresponding lower-section sealing steel plate blocks by adopting socket structures. By the adoption of the structure that the upper and lower sections, the left and right blocks and the upper and lower corresponding blocks are overlapped front and back and connected through the socket structures, when sealing is conducted, the upper section blocks are pushed to the position of a tunnel portal embedded steel ring and fixed through full welding, welding construction is easy and convenient, workload is small, time for sealing the tunnel portal can be greatly shortened, and the tunnel portal can be rapidly sealed.

Description

Technical Field

[0001] The utility model belongs to the technical field of rectangular jacking pipe construction, in particular to a sealing structure for a rectangular jacking pipe starting tunnel. Background Art

[0002] To ensure smooth entry of the rectangular pipe jacking machine into the tunnel for the pedestrian crossing, the starting tunnel portal was designed to be larger than the machine and the pipe segments. Once all the segments were in place, a gap—typically 10-15 cm—was left between the structural sidewalls and the segments. Furthermore, the gaps between the soil and the segments created a channel for soil erosion between the stratum and the tunnel portal. In water-rich soft soil, the risk of water and sand gushing during the launch and receiving phases was significant.

[0003] Conventional sealing measures involve welding a sealing ring plate between the portal steel ring and the end pipe segment. In practice, the sealing ring plate is heavy, often requiring three workers to lift and weld a single plate. Reducing the size of the block units will inevitably result in a larger weld surface and a greater number of welds, impacting the integrity of the sealing ring. This is particularly true at the starting portal, where a small steel box with rubber cord is filled with mud. Once the pipe segment is detached, the mud will spill onto the end face of the segment, creating significant difficulties for welding. In particular, once the pipe segment is in place, the portal needs to be quickly sealed, and the sealing ring plate must be quickly welded and secured to prevent the portal from being exposed for extended periods, which could lead to water and sand gushing. However, the aforementioned sealing structure makes it difficult to achieve rapid portal closure. Utility Model Content

[0004] The utility model provides a sealing structure for a rectangular pipe jacking starting tunnel in order to solve the technical problems existing in the known technology. The structure can quickly close the tunnel and is easy to construct.

[0005] The utility model adopts the following technical solutions to solve the technical problems existing in the known technology: a sealing structure for a rectangular jacking starting tunnel, comprising an upper sealing steel plate welded to a pre-embedded steel ring of the tunnel and a lower sealing steel plate welded to the outer end face of the terminal pipe segment, the upper sealing steel plate and the lower sealing steel plate are connected by welds, and the upper sealing steel plate and the lower sealing steel plate are both welded by a plurality of blocks arranged in parallel on the left and right. Before the sealing construction, the lower sealing steel plate is welded to the outer end face of the terminal pipe segment, the upper sealing steel plate blocks are superimposed on the outer side face of the lower sealing steel plate, and are connected to the corresponding lower sealing steel plate blocks by a socket structure.

[0006] Pins are provided on both sides of the bottom inner side of the upper sealing steel plate block, and sockets are provided on both sides of the bottom outer side of the lower sealing steel plate block, and the sockets are adapted to the pins.

[0007] The advantages and positive effects of the utility model are as follows: by adopting a structure in which upper and lower sections, left and right blocks are formed, and the upper and lower corresponding blocks are overlapped front and back and connected by a socket structure, when sealing, the upper section block is pushed to the position of the embedded steel ring of the tunnel door and fully welded and fixed. The section and block structure is adopted, the steel plate is light in weight, and the welding construction is simple; and the lower section sealing steel plate is welded to the end pipe section in advance. When sealing, it is only necessary to push up the upper section sealing steel plate block and complete the welding. The welding workload is small, which can greatly shorten the time for closing the tunnel door and can quickly close the tunnel opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a structural diagram of the utility model;

[0009] Figure 2 for Figure 1 A partial enlarged view of

[0010] Figure 3 This is a schematic diagram of the upper sealing steel plate of the utility model being divided into blocks;

[0011] Figure 4 This is a schematic diagram of the subdivision of the lower sealing steel plate of the present invention;

[0012] Figure 5 This is a schematic diagram of the upper and lower sealing steel plates of the present invention being connected in corresponding blocks;

[0013] Figure 6 for Figure 1 The elevation drawing is also the sealing steel plate block and weld arrangement drawing.

[0014] In the figure: 1. End pipe section; 2-1. Upper section sealing steel plate; 2-2. Lower section sealing steel plate; 3. Pre-buried steel ring for portal; 4. Main structure; 5. Enclosure structure; 6. Reinforced soil; 7. Socket; 8. Pin. DETAILED DESCRIPTION

[0015] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0016] See also Figures 1 to 6 A sealing structure for a rectangular jacking tunnel portal comprises an upper sealing steel plate 2-1 welded to a pre-buried steel ring 3 of the tunnel portal and a lower sealing steel plate 2-2 welded to an outer end face of a terminal pipe section 1. The upper sealing steel plate 2-1 and the lower sealing steel plate 2-2 are connected by welds. The upper sealing steel plate 2-1 and the lower sealing steel plate 2-2 are both welded from a plurality of blocks arranged side by side on the left and right, are light in weight, and are convenient for lifting and welding.

[0017] Before the sealing construction, the lower sealing steel plate 2-2 is welded to the outer end surface of the terminal pipe section 1, and the upper sealing steel plate blocks are superimposed on the outer surface of the lower sealing steel plate 2-2 and connected to the corresponding lower sealing steel plate blocks using a socket structure.

[0018] In this embodiment, pins 8 are provided on both sides of the bottom inner side of the upper sealing steel plate block, and sockets 7 are provided on both sides of the bottom outer side of the lower sealing steel plate block, and the sockets 7 are adapted to the pins 8.

[0019] Production and application of this utility model:

[0020] The pre-embedded steel ring 3 of the tunnel portal is fixed to the main structure 4 in advance during structural construction. The sealing steel plate is made of 8mm thick steel plate and is divided into two sections, each of which is connected by multiple blocks connected left and right. The upper sealing steel plate block has a pin 8 welded to the bottom of the inner side, and the lower sealing steel plate block has a socket 7 welded to the bottom of the outer side. After the semi-finished product is processed, the lower sealing steel plate 2-2 is welded and fixed to the end pipe section 1 in advance, and the upper sealing steel plate block is connected to the lower sealing steel plate 2-2. The lower sealing steel plate 2-2 and the upper sealing steel plate block are hoisted into the well along with the end pipe section 1. After the retaining structure 5 is demolished, the pipe section is pushed forward, gradually passing through the reinforced soil 6 and the retaining structure 5. When all the pipe sections are in place, the upper sealing steel plate block is pushed out to the position of the pre-embedded steel ring 3 of the tunnel portal and fully welded and fixed, finally completing the entire sealing process. When welding the upper sealing steel plate in blocks, give priority to welding the position with the larger gap between the pipe section and the portal steel ring. When welding, first perform spot welding to fix it, then perform large-surface welding to fix it, and finally complete all welds.

[0021] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which all fall within the scope of protection of the present invention.

Claims

1. A sealing structure for a rectangular jacking tunnel, characterized in that: It includes an upper sealing steel plate welded to the pre-buried steel ring of the tunnel door and a lower sealing steel plate welded to the outer end face of the terminal pipe section. The upper sealing steel plate and the lower sealing steel plate are connected by a weld seam. The upper sealing steel plate and the lower sealing steel plate are both welded by multiple blocks arranged side by side. Before sealing construction, the lower sealing steel plate is welded to the outer end surface of the terminal pipe section, and the upper sealing steel plate blocks are superimposed on the outer side surface of the lower sealing steel plate and connected to the corresponding lower sealing steel plate blocks using a socket structure.

2. The sealing structure for a rectangular jacking tunnel according to claim 1, characterized in that: Pins are provided on both sides of the bottom inner side of the upper sealing steel plate block, and sockets are provided on both sides of the bottom outer side of the lower sealing steel plate block, and the sockets are adapted to the pins.

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