Reinforcing and connecting structure for tunnel portal of mechanical connection channel

Abstract

The utility model discloses a tunnel portal reinforcing and connecting structure of a mechanical method connecting channel. The problem that in the prior art, a mechanical method connecting channel cannot be safely constructed under the condition that no machinable tunnel portal is reserved is solved. The mechanical method connecting channel portal reinforcing and connecting structure comprises a reinforcing ring beam which is arranged on the inner wall of a main tunnel segment and corresponds to a connecting channel door opening, a chiseling opening is formed in the position, corresponding to the connecting channel door opening, of the main tunnel segment, a portal ring plate is arranged in the chiseling opening, a grouting hole is reserved in the portal ring plate, and the grouting hole is communicated with the main tunnel segment. Grouting compaction is adopted between the tunnel portal ring plate and the main tunnel segment. Compared with the prior art, by adopting the tunnel portal reinforcing and connecting structure, the problem that a machinable tunnel portal structure must be reserved in a main tunnel before a mechanical method is adopted for connecting channel construction due to the fact that a connecting channel heading machine cannot directly cut a main tunnel segment structure in the prior art is solved; and meanwhile, the method can be suitable for construction of connection channels with circular and non-circular sections, the construction range of the connection channels through a mechanical method is expanded, and the construction risk can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of communication channel construction, in particular to a mechanical communication channel tunnel door reinforcement and connection structure. Background Art

[0002] As the escape emergency passage of the tunnel, the communication passage is an important part of the municipal tunnel. For dark excavated tunnels, the construction of the communication passage is a high-risk link, and the construction process often involves cave-in collapse, mud spraying, and water gushing. Common communication passage reinforcement methods include freezing, in-tunnel grouting reinforcement, and ground soil reinforcement, but they still cannot change the problems of poor construction environment, low construction efficiency, poor construction quality, and high construction risks of the communication passage. Especially for subway sections in bustling urban areas, since the buried depth of the communication passage is usually about 15m, its construction has a great impact on the ground. In order to ensure construction safety, the construction of the communication passage generally adopts full-section grouting reinforcement or freezing reinforcement, which will greatly increase the construction period and cost.

[0003] The use of modern mechanical equipment to replace manual work is the development trend of underground engineering. At present, some cities have tried and applied experimental projects. The mechanical method of connecting channel needs to reserve a portal that can be directly cut by the connecting channel boring machine. In the prior art, such as the shield tunnel composite pipe segment concrete pipe segment in the Chinese patent with publication number CN106948833B, when starting and receiving with steel sleeves, no large-scale soil reinforcement is required; but since the construction of the mechanical method of connecting channel can only be carried out after the main line tunnel construction is completed, there is a situation: the connecting channel does not consider the mechanical method of construction during the main line construction, the main line tunnel does not reserve a cuttable portal, and the connecting channel boring machine cannot directly break the portal. If the subsequent connecting channel is constructed by mechanical method, it will cause the portal stress to change, affecting the integrity of other pipe segments, and there is a great risk. In addition, the main tunnel does not reserve the connecting channel portal structure, and there are also problems in the connection between the subsequent connecting channel pipe section and the main tunnel portal structure.

[0004] For example, the Chinese patent with publication number CN114439487A proposed a construction method for the opening of the existing shield tunnel communication channel. The method first supports the inside of the tunnel, then uses three steps to excavate the pilot tunnel, and finally removes the support. It only considers how to perform the opening construction, and does not consider the connection between the subsequent communication channel pipe segment and the portal structure of the mechanical communication channel, and it is also necessary to perform the sealing construction of the pipe segment and the portal. The Chinese patent with publication number CN113338993B proposed a communication channel reinforced ring beam structure and its construction method. It mainly considers improving the strength of the pipe segment structure at the communication channel opening by constructing a reinforced ring beam, and does not involve the cuttable portal structure required for the mechanical communication channel. The Chinese patent with publication number CN111441784A proposes a shield receiving construction method without a portal steel ring device, which solves the technical problem of shield receiving under the condition of having an end wall but no portal steel ring device. However, it only considers the use of a 15mm thick steel plate as a portal steel ring, and does not consider the corresponding reinforcement of the end wall during the working shaft reception and the main tunnel segment during the main tunnel construction communication channel.

[0005] In view of the above situation, it is necessary to develop a mechanical method to strengthen and connect the tunnel portals of the communication channel, which can be constructed without reserved cuttable tunnel portals. Utility Model Content

[0006] In view of the deficiencies in the above-mentioned background technology, the utility model proposes a mechanical communication channel portal reinforcement and connection structure, which solves the problem in the prior art that the mechanical communication channel cannot be safely constructed without a reserved cuttable portal.

[0007] The technical solution of the utility model is implemented as follows: a mechanical method connecting channel portal reinforcement and connection structure, including a reinforcement ring beam arranged on the inner wall of the main tunnel segment and corresponding to the connecting channel portal, a chiseling opening is arranged at the main tunnel segment corresponding to the connecting channel portal, a portal ring plate is arranged in the chiseling opening, a grouting hole is reserved on the portal ring plate, and grouting is used to compact the portal ring plate and the main tunnel segment. The reinforcement ring beam and the like are used as portal reinforcement structures to strengthen the main tunnel segment before or after the portal is broken and ensure that the portal can be broken safely. The portal ring plate and the like are used as portal connection structures to achieve reliable connection between the main tunnel segment and the connecting channel segment. The above structure can be carried out without a reserved cuttable portal, and can be applied to the construction of circular and non-circular connecting channels, while meeting the portal sealing and water-stopping conditions, and reliable connection between the connecting channel segment and the main tunnel segment, ensuring the safety of the portal structure and shortening the construction period.

[0008] Further preferably, a reinforced soil body is provided on the outer side of the main tunnel segment corresponding to the door opening of the communication channel, and the reinforced soil body extends in the direction of the communication channel for a distance of not less than 1 m.

[0009] Further preferably, an in-hole support is provided at the middle portion of the main tunnel segment corresponding to the connecting passage doorway.

[0010] Further preferably, the reinforcing ring beam and / or the tunnel door ring plate are provided with a tunnel door sealing and water-stopping member facing the door opening of the communication passage. The tunnel door sealing and water-stopping member is a sealing water-stopping strip or a sleeve.

[0011] Further preferably, the reinforced ring beam is fixed to the main tunnel segment by embedded reinforcement or anchor bolts, and the portal ring plate is fixed to the main tunnel segment by embedded reinforcement or anchor bolts.

[0012] Further preferably, the portal ring plate is connected to the communication channel segment through a portal connecting ring beam. The portal connecting ring beam is a cast-in-place concrete ring beam or an assembled steel structure ring beam.

[0013] Further preferably, the outer contour dimension of the chiseled opening is larger than the door opening dimension of the communication passage and smaller than the inner contour dimension of the reinforced ring beam.

[0014] The beneficial effects of the utility model are as follows: compared with the prior art, the use of this portal reinforcement and connection structure solves the problem in the prior art that the tunnel boring machine for the connecting channel cannot directly cut the main tunnel segment structure, which results in the need to reserve a cuttable portal structure in the main tunnel before the mechanical method connecting channel construction is used. At the same time, it can be applied to the construction of connecting channels with circular and non-circular cross-sections, expanding the construction scope of the mechanical method connecting channel and effectively reducing the construction risk. The portal reinforcement structure mainly includes components such as a reinforcement ring beam. The reinforcement ring beam is connected to the main tunnel segment by embedded bars or anchor bolts, so as to strengthen the main tunnel segment before or after the portal is broken and ensure that the portal can be broken safely. The portal connection structure mainly includes components such as a portal ring plate and a portal connection ring beam. The main tunnel segment and the portal ring plate are connected by embedded bars or anchor bolts, and the portal ring plate and the connecting channel segment are connected by the portal connection ring beam, thereby realizing a reliable connection between the main tunnel segment and the connecting channel segment. The use of this portal reinforcement and connection structure can significantly improve the stability of the tunnel boring machine during excavation, enhance the overall rigidity of the portal structure, and ensure the overall safety of the portal. The design of the reinforced ring beam takes into account the convenience of construction. Through reasonable prefabrication and modular design, the ring beam can be standardized in the factory and then quickly assembled on the construction site, which not only improves construction efficiency, but also reduces the complexity and risk of on-site operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a schematic diagram of the initial state of the main tunnel of the utility model;

[0017] Figure 2 Schematic diagram of installing a reinforced ring beam for the main tunnel;

[0018] Figure 3 This is a schematic diagram of the main tunnel segment structure after the portal is removed under the protection of the reinforced ring beam;

[0019] Figure 4 Schematic diagram of the main tunnel after the gate ring plate is installed;

[0020] Figure 5 Schematic diagram of the main tunnel after the portal water stop is installed;

[0021] Figure 6 Schematic diagram of simultaneous installation of reinforced ring beam and in-tunnel support for the main tunnel;

[0022] Figure 7 Schematic diagram of the main tunnel after the sleeve structure is installed;

[0023] Figure 8 This is a schematic diagram of the installation of the portal water stop on the reinforced ring beam;

[0024] Fig. 9 Schematic diagram of installing in-hole support for the main tunnel;

[0025] Fig.10 This is a schematic diagram of the main tunnel structure with the tunnel portal segment removed under the support and protection inside the tunnel;

[0026] Fig.11 Schematic diagram of installing a reinforced ring beam for the main tunnel;

[0027] Fig.12 Schematic diagram of the main tunnel after the portal water stop is installed;

[0028] Fig.13 Front view of the installation of the reinforced ring beam in the removed segment (the communication channel is circular);

[0029] Fig.14 Front view of the installation of the reinforced ring beam in the removed segment (the communication channel is rectangular);

[0030] Fig.15 Front view of the reinforced ring beam installed on the segment (the communication channel is circular);

[0031] Fig.16 Front view of the reinforced ring beam installed on the pipe segment (the communication channel is rectangular);

[0032] Fig.17 To strengthen the side view of the ring beam;

[0033] Fig.18 This is a side view of the tunnel door ring plate.

[0034] In the figure, 1: main tunnel segment; 2: connecting passage portal; 3: solid soil; 4: reinforced ring beam; 5: embedded reinforcement or anchor bolts; 6: chiseled opening; 7: portal ring plate; 8: grouting hole; 9: portal sealing and water-stopping component; 10: sleeve; 11: support member in the tunnel. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] like Figure 2 As shown, in Example 1, a mechanical method connecting channel portal reinforcement and connection structure includes a reinforcement ring beam 4 arranged on the inner wall of the main tunnel segment 1 and corresponding to the connecting channel portal 2, and the reinforcement ring beam 4 is an arc-shaped ring beam such as Fig.17 As shown, the reinforcing ring beam 4 is arranged at the position to be constructed with the communication channel in the main tunnel, and its shape can be adjusted to circular or non-circular according to the construction conditions. Preferably, the reinforcing ring beam 4 is fixed to the main tunnel segment 1 by anchor bolts or anchors 5. That is, the reinforcing ring beam is a prefabricated reinforced concrete structure, and a structure for anchor bolts or anchor bolts is pre-set, and it is fixed to the main tunnel by anchor bolts or anchor bolts. The main tunnel segment 1 is provided with a chiseled opening 6 at the location corresponding to the communication channel portal 2. The chiseled opening 6 is an opening formed by chiseling the segment within the range of the communication channel portal on the main tunnel. A portal ring plate 7 is provided in the chiseled opening 6 to form the subsequent communication channel portal 2. Preferably, the portal ring plate 7 is fixed to the main tunnel segment 1 by anchor bolts or anchors 5. The portal ring plate 7 is an arc-shaped ring plate such as Fig.18 As shown, a grouting hole 8 is reserved on the tunnel gate ring plate 7, and grouting is used to fill the gap between the tunnel gate ring plate 7 and the main tunnel segment 1; that is, grouting is performed through the grouting hole 8 to fill the gap between the tunnel gate ring plate and the main tunnel segment.

[0037] The portal reinforcement structure mainly includes reinforcement ring beams and other components. The reinforcement ring beam is connected to the main tunnel segment by embedded steel bars or anchor bolts, which is used to strengthen the main tunnel segment before or after the portal is broken and ensure the portal can be broken safely. The portal connection structure mainly includes portal ring plates, portal connection ring beams and other components. The main tunnel segment and the portal ring plate are connected by embedded steel bars or anchor bolts, and the portal ring plate and the connecting channel segment are connected by the portal connection ring beam, thereby realizing a reliable connection between the main tunnel segment and the connecting channel segment.

[0038] This embodiment is a preferred solution. A reinforced soil body 3 is provided at the outer side of the main tunnel segment 1 corresponding to the connecting channel doorway 2. The reinforced soil body 3 extends in the direction of the connecting channel by no less than 1m. During the specific construction, the soil body outside the main tunnel segment is reinforced to form a reinforced soil body. The soil body reinforcement range is at least 1m larger than the outer side of the connecting channel doorway to ensure the stability of the connecting channel and the main tunnel. Grouting reinforcement can also be frozen reinforcement.

[0039] In this embodiment, as a preferred solution, a tunnel gate sealing and water-stopping member 9 facing the connecting passage doorway 2 is provided on the tunnel gate ring plate 7; the tunnel gate sealing and water-stopping member 9 is a sealing and water-stopping strip. In addition, the tunnel gate sealing and water-stopping member is composed of a steel plate with calculated dimensions, which can also be arranged on the reinforcing ring beam or on the inner wall of the main tunnel and fixed by welding. The tunnel gate sealing and water-stopping member can isolate the groundwater outside the main tunnel and prevent adverse conditions such as water gushing during the excavation of the tunnel gate or the excavation of the connecting passage.

[0040] As a preferred solution, the portal ring plate 7 is connected to the communication channel segment through a portal connecting ring beam. The portal connecting ring beam is a cast-in-place concrete ring beam or an assembled steel structure ring beam, which realizes a reliable connection with the communication channel segment.

[0041] In the above portal structure, by setting a reinforcing ring beam in the main tunnel without a reserved cuttable portal, the strength and rigidity of the structure around the portal to be drilled can be greatly improved, and the cracking of the pipe segments around the portal due to stress concentration when drilling the portal can be prevented, so that the pipe segments at the portal of the main tunnel can be safely drilled out, and then the portal sealing water-stopping components are installed, and the water-stopping steel plate is welded to the steel sleeve and the outer side of the portal to avoid water gushing when the connecting channel boring machine is started or received. Then the portal structure is set in the drilled part, the portal water-stopping components are installed, and the connecting channel boring machine is started or received.

[0042] The specific construction process of the above structure is as follows:

[0043] S1. Figure 1 As shown, the size and shape of the main tunnel upper communication passage portal 2 are determined, and the positions of the grouting holes of the main tunnel segments are determined.

[0044] S2. Reinforce the soil outside the main tunnel segments, and the soil reinforcement range should be at least 1m larger than the outside of the connecting channel portal.

[0045] S3. Figure 2 As shown, inside the main tunnel segment 1, a reinforcing ring beam 4 is installed on the outside of the connecting passage portal 2. The shape of the reinforcing ring beam can be adjusted according to actual conditions. The locations where holes need to be drilled for planting rebars or anchor bolts are determined through the segment drawings, and pretreatment of the planting rebars or anchor bolt connections is performed. The reinforcing ring beam is connected to the main tunnel segment through planting rebars or anchor bolts 5.

[0046] S4. Figure 3 As shown, under the support of the reinforced ring beam, the pipe segments within the scope of the main tunnel upper communication channel portal are chiseled out to form a chiseled opening 6, which should be slightly larger than the communication channel portal 2, but not larger than the scope of the reinforced ring beam. That is, the outer contour size of the chiseled opening 6 is larger than the communication channel portal 2 and smaller than the inner contour size of the reinforced ring beam 4.

[0047] S5. Figure 5 As shown, a tunnel gate ring plate 7 is installed, and the tunnel gate ring plate is connected to the main tunnel segment through a reinforcing bar or an anchor bolt 5, and a grouting hole 8 is reserved on the tunnel gate ring plate. Grouting is performed through the grouting hole 8 to fill the gap between the tunnel gate ring plate and the main tunnel segment tightly.

[0048] S6. Install the tunnel door sealing and water-stopping member 9, weld and fix it to the tunnel door ring plate 7, and then carry out the starting and receiving operations of the communication channel boring machine.

[0049] S7. After the construction of the communication channel is completed, the communication channel segment can be connected to the portal ring plate 7 through the portal connecting ring beam. The portal connecting ring beam can be a cast-in-place concrete structure or an assembled steel structure.

[0050] like Figure 6 As shown, in Example 2, a mechanical method for strengthening and connecting the portal of the communication channel, the middle part of the main tunnel segment 1 is provided with an in-hole support 11 corresponding to the portal 2 of the communication channel to form an internal support. The strengthening ring beam is replaced with an assembled steel structure, and the starting and receiving steel sleeves can be directly welded to the steel ring beam.

[0051] In this embodiment, as a preferred solution, Figure 7 As shown, the reinforcing ring beam 4 is provided with a tunnel door sealing and water stopping component 9 facing the communication channel doorway 2. In this embodiment, the tunnel door sealing and water stopping component 9 is a sleeve 10; the sleeve 10 is a steel structure sleeve to meet the water stopping requirements when the communication channel boring machine starts and receives.

[0052] In the portal structure of this embodiment, by setting a reinforcing ring beam in the main tunnel without a reserved cuttable portal, the strength and rigidity of the structure around the portal to be drilled can be greatly improved, and the cracking of the pipe segments around the portal due to stress concentration when drilling the portal can be prevented, so that the pipe segments at the portal of the main tunnel can be safely drilled out, and then the portal sealing and water-stopping components are installed, and the water-stopping steel plate is welded to the steel sleeve and the outer side of the portal to avoid water gushing when the connecting channel boring machine is started or received. Alternatively, an in-tunnel support is set in the main tunnel, and the pipe segments at the portal of the main tunnel are drilled out under the protection of the portal support, and then the portal structure is set in the drilled part, the in-tunnel support is removed, and the portal water-stopping components are installed to start or receive the connecting channel boring machine.

[0053] The specific construction process of the above structure is as follows:

[0054] S1. Fig. 9 As shown, the size and shape of the communication channel portal 2 on the main tunnel segment are determined; at the same time, the soil outside the main tunnel segment is reinforced, and the soil reinforcement range is at least 1m larger than the outside of the communication channel portal; then, an in-tunnel support 11 is set inside the main tunnel to perform internal support.

[0055] S2. Fig.10 As shown, under the support of the support in the tunnel, the pipe segments within the range of the connecting channel portal on the main tunnel are chiseled out to form a chiseled opening, and the chiseled opening 6 should be slightly larger than the connecting channel portal 2; that is, the outer contour size of the chiseled opening 6 is larger than the size of the connecting channel portal 2 and smaller than the inner contour size of the reinforcing ring beam 4.

[0056] S3. Fig.11 As shown, a reinforcing ring beam 4 is installed within the range of the main tunnel portal excavation, and the reinforcing ring beam is connected to the main tunnel segment through embedded bars or anchor bolts 5, and then the gap between the reinforcing ring beam and the main tunnel segment is filled and compacted by grouting.

[0057] S4. Fig.12 As shown, the tunnel door sealing and water-stopping component, namely the sleeve 10, is installed, and then the starting and receiving operations of the communication channel boring machine can be carried out.

[0058] S5. After the construction of the communication channel is completed, the communication channel segment can be connected to the reinforced ring beam 4 through the portal connecting ring beam. The portal connecting ring beam can be a cast-in-place concrete structure or an assembled steel structure.

[0059] Compared with the prior art, the use of this portal reinforcement and connection structure solves the problem in the prior art that the tunnel boring machine for the connecting channel cannot directly cut the main tunnel segment structure, so that a cuttable portal structure must be reserved in the main tunnel before the mechanical method is used to construct the connecting channel. Figures 13-16 As shown, the utility model can be applied to the construction of communication channels with circular and non-circular cross-sections, which expands the construction scope of mechanical communication channels and can effectively reduce construction risks.

[0060] The use of the tunnel portal reinforcement and connection structure of the utility model can significantly improve the stability of the tunnel boring machine during the tunneling process. The overall rigidity of the tunnel portal structure is enhanced to ensure the overall safety of the tunnel portal. The design of the reinforced ring beam takes into account the convenience of construction. Through reasonable prefabrication and modular design, the ring beam can be standardized in the factory and then quickly assembled at the construction site. This not only improves the construction efficiency, but also reduces the complexity and risk of on-site operations.

[0061] Embodiment 3: A mechanical method for strengthening and connecting the tunnel door of the communication channel, combined with Figure 8As shown, the reinforcing ring beam 4 can be placed as close to the communication channel portal 2 as possible, and the portal ring plate 7 is no longer required, and the portal sealing and water-stopping member 9 can be directly installed on the reinforcing ring beam 4. The above structure in this embodiment can also solve the problem in the prior art that the communication channel boring machine cannot directly cut the main tunnel segment structure, so that the cuttable portal structure must be reserved in the main tunnel before the mechanical communication channel construction is adopted, and it can also be applied to the construction of communication channels with circular and non-circular cross-sections.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A mechanical communication channel door reinforcement and connection structure, characterized in that: The invention comprises a reinforcing ring beam (4) arranged on the inner wall of a main tunnel segment (1) and corresponding to a connecting passage doorway (2); a chiseled opening (6) is arranged on the main tunnel segment (1) at a position corresponding to the connecting passage doorway (2); a tunnel door ring plate (7) is arranged in the chiseled opening (6); a grouting hole (8) is reserved on the tunnel door ring plate (7); and grouting is used to compact the tunnel door ring plate (7) and the main tunnel segment (1).

2. The mechanical communication channel door reinforcement and connection structure according to claim 1 is characterized in that: A reinforced soil body (3) is provided on the outer side of the main tunnel segment (1) corresponding to the communication passage doorway (2).

3. The mechanical communication channel door reinforcement and connection structure according to claim 2 is characterized in that: The reinforced soil body (3) extends in the direction of the communication channel for a distance of not less than 1 m.

4. The mechanical communication channel door reinforcement and connection structure according to any one of claims 1 to 3, characterized in that: An in-hole support member (11) is provided at a location in the middle of the main tunnel segment (1) corresponding to the communication passage doorway (2).

5. The mechanical communication channel door reinforcement and connection structure according to claim 1 is characterized in that: The reinforcing ring beam (4) and / or the door ring plate (7) are provided with a door sealing and water-stopping component (9) facing the communication passage doorway (2).

6. The mechanical communication channel door reinforcement and connection structure according to claim 5 is characterized in that: The tunnel door sealing and water-stopping component (9) is a sealing and water-stopping strip or a sleeve (10).

7. The mechanical communication channel door reinforcement and connection structure according to claim 1 is characterized in that: The reinforced ring beam (4) is fixed to the main tunnel segment (1) by means of embedded steel bars or anchor bolts (5), and the portal ring plate (7) is fixed to the main tunnel segment (1) by means of embedded steel bars or anchor bolts (5).

8. The mechanical communication channel door reinforcement and connection structure according to claim 1 is characterized in that: The portal ring plate (7) is connected to the communication channel segment via the portal connecting ring beam.

9. The mechanical communication channel door reinforcement and connection structure according to claim 8 is characterized in that: The portal connecting ring beam is a cast-in-place concrete ring beam or an assembled steel structure ring beam.

10. The mechanical communication channel door reinforcement and connection structure according to claim 1 is characterized in that: The outer contour size of the chiseled opening (6) is larger than the size of the communication passage door opening (2) and smaller than the inner contour size of the reinforced ring beam (4).

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