Parallel double island type tunnel construction method

Abstract

The application discloses a parallel double-island type tunnel construction method, which comprises the following steps: building a vertical shaft at a first preset position on the ground; after the vertical shaft is built, building a horizontal air duct at the bottom of the vertical shaft along a first preset construction direction towards a second preset position; with the construction of the horizontal air duct, sequentially building a first tunnel and a second tunnel which are spaced apart from each other along a second preset direction in the already formed horizontal air duct; during the construction of the first tunnel and the second tunnel, a connecting passage is arranged every preset interval along the second preset construction direction, and the connecting passage is used for connecting the first tunnel and the second tunnel. The construction method provided by the application facilitates the synchronous construction of two tunnels, improves the construction efficiency, and ensures the safe and rapid construction of the double-island type station tunnel.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a method for constructing a parallel double-island tunnel. Background Technology

[0002] A subway is a high-speed, high-capacity, electrically powered rail transit system built in cities. Trains run on fully enclosed tracks. Lines in the city center are primarily located underground in tunnels, while lines outside the city center are generally located on elevated bridges or above ground. The English term is metro (underground railway, subway). A subway is a high-density, high-capacity urban rail transit system encompassing various underground and above-ground sections of a city.

[0003] With the rapid urbanization in my country, the number and mileage of subway lines in some cities have experienced explosive growth. However, due to the initial construction of some lines without considering future additions, there are numerous problems such as uneconomical track design and overlapping / duplicated station construction, resulting in the destruction of significant underground space resources. Based on the consensus among subway builders, the rational and effective development of underground space resources has become a crucial factor in the initial planning of subway lines. Currently, there is a lack of efficient and safe construction methods for building multiple lines with shared tracks and stations. Summary of the Invention

[0004] The main objective of this invention is to provide a parallel double-island tunnel construction method, which aims to solve the technical problem that existing technologies lack safe and efficient construction methods for multi-track co-station designs.

[0005] To achieve the above objectives, this invention proposes a parallel double-island tunnel construction method, comprising the following steps:

[0006] A vertical shaft is constructed at a first predetermined location on the ground. After the construction of the vertical shaft is completed, a horizontal ventilation duct is constructed at the bottom of the vertical shaft along the first predetermined construction direction toward a second predetermined location.

[0007] As the horizontal air duct is constructed, a first tunnel and a second tunnel are sequentially built in the already formed horizontal air duct along a second preset direction, spaced apart from each other. During the construction of the first tunnel and the second tunnel, a connecting channel is set at a preset interval along the second preset construction direction. The connecting channel is used to connect the first tunnel and the second tunnel.

[0008] In some embodiments of the present invention, during the construction of the horizontal air duct, the CD method and the step method are used to excavate the upper section of the horizontal air duct along a first preset direction to construct the first construction cross passage.

[0009] In the already formed first construction cross passage, the upper sections of the first tunnel and the second tunnel are excavated along the second preset direction.

[0010] In some embodiments of the present invention, during the excavation of the upper section of the first tunnel and the upper section of the second tunnel, after the upper section of the first tunnel reaches a preset distance, the upper section of the second tunnel is then excavated simultaneously until the excavation of the upper sections of the first tunnel and the second tunnel is completed.

[0011] In some embodiments of the present invention, during the excavation of the upper section of the first tunnel and the upper section of the second tunnel, the connecting channel is provided at preset intervals between the upper sections of the first tunnel and the second tunnel that have been excavated.

[0012] In some embodiments of the present invention, after the upper section of the first tunnel and the upper section of the second tunnel are excavated, the middle section of the horizontal ventilation duct and the lower section of the horizontal ventilation duct are excavated using the CD method and the step method to construct the second construction cross passage.

[0013] In the already formed second construction cross passage, the lower sections of the first tunnel and the second tunnel are excavated along the second preset direction.

[0014] In some embodiments of the present invention, during the excavation of the lower cross-section of the first tunnel and the lower cross-section of the second tunnel, after the lower cross-section of the first tunnel reaches a preset distance, the lower cross-section of the second tunnel is then excavated simultaneously until the lower cross-sections of the first tunnel and the lower cross-section of the second tunnel are excavated, so as to construct the complete first tunnel and the second tunnel.

[0015] In some embodiments of the present invention, the first construction crosswalk and the second construction crosswalk constitute the horizontal ventilation duct.

[0016] In some embodiments of the present invention, after the construction of the vertical shaft and the horizontal ventilation duct is completed, a gate is built in the vertical shaft. After the gate is built, the construction of the first tunnel and the second tunnel begins.

[0017] In some embodiments of the present invention, the preset spacing is 50 meters.

[0018] In some embodiments of the present invention, during the construction of the first tunnel and the second tunnel, when the core rock pillar is removed, the removal distance of the core rock pillar is controlled within 15 meters.

[0019] This invention constructs a horizontal ventilation duct by setting up a vertical shaft, and uses the horizontal ventilation duct as the starting point for excavation of a parallel double-island station tunnel. That is, it uses the horizontal ventilation duct as the starting point for excavation, and realizes the discharge of slag and feeding of materials through the connecting channel between the two tunnels, which facilitates the synchronous construction of the two tunnels, improves construction efficiency, and ensures the safe and rapid construction of the double-island station tunnel. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the vertical shaft and horizontal ventilation duct in an embodiment of the parallel double-island tunnel construction method of the present invention;

[0022] Figure 2 This is a schematic diagram of the excavation of the ventilation duct and the inclined tunnel in the parallel double-island tunnel construction method of the present invention;

[0023] Figure 3 This is a schematic diagram of the tunnel excavation sequence in the parallel double-island tunnel construction method of the present invention;

[0024] Figure 4 This is a diagram showing the construction sequence of the tunnel structure in the parallel double-island tunnel construction method of the present invention. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0026] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0027] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0029] like Figures 1-4 As shown, the present invention provides a parallel double-island tunnel construction method, which includes the following steps:

[0030] S100 constructs a vertical shaft at a first preset location on the ground. After the vertical shaft is constructed, a horizontal air duct is constructed at the bottom of the vertical shaft along a first preset direction toward a second preset location.

[0031] Specifically, before constructing the shaft, shaft excavation and lifting equipment needs to be installed at the predetermined location. The equipment selection is determined based on the shaft's cyclic advance project volume.

[0032] It is understandable that during the construction of the shaft, the shaft can be excavated manually or mechanically at the first predetermined location, and the excavation residue such as waste slag can be handled using lifting equipment.

[0033] S102 The upper section of the horizontal ventilation duct is excavated along the first preset direction using the CD method and the step method to construct the first construction cross passage.

[0034] S103 Before the construction of the first tunnel and the second tunnel, a gate is built in the vertical shaft. After the gate is built, the construction of the first tunnel and the second tunnel begins.

[0035] The advanced support and initial support at the horizontal ventilation shaft gate should be reinforced in the design. Within a 120° range of the top supply area of ​​the conversion tunnel section, a large pipe shed with a diameter of 108mm should be used as advanced support, and it should work together with the I25 steel supply frame initial support system to avoid tunnel deformation and settlement caused by stress conversion during the excavation of the gate.

[0036] S104 In the already formed first construction cross passage, the upper section of the first tunnel is excavated first along the second preset direction. After the upper section of the first tunnel is constructed to the preset distance, the upper section of the second tunnel is excavated simultaneously until the upper sections of the first and second tunnels are completely excavated.

[0037] During the excavation of the upper sections of the first tunnel and the second tunnel, connecting passages are set up at predetermined intervals between the upper sections of the first tunnel and the second tunnel that have been excavated.

[0038] After the excavation of the upper sections of the first and second tunnels of S106 was completed, the middle and lower sections of the horizontal ventilation ducts were excavated using the CD method and the bench method to construct the second construction cross passage.

[0039] S108 In the already formed second construction cross passage, the lower sections of the first tunnel and the second tunnel are excavated along the second preset direction. During the excavation of the lower sections of the first tunnel and the second tunnel, after the lower section of the first tunnel reaches the preset distance, the lower section of the second tunnel is excavated simultaneously until the lower sections of the first tunnel and the second tunnel are excavated, so as to construct the complete first tunnel and the second tunnel.

[0040] It should be further clarified that the lower sections of "the first tunnel and the second tunnel" together, along with the upper sections mentioned above ("the upper sections of the first tunnel and the second tunnel"), constitute the complete first and second tunnels.

[0041] Specifically, the first and second tunnels were constructed using the double-sided pilot tunnel method. The lower and middle sections of the pilot tunnels on both sides of the first and second tunnels were excavated, and the lower and middle sections of the horizontal ventilation ducts were constructed simultaneously. The steps of the lower and middle sections of the horizontal ventilation ducts were staggered by 3-5m.

[0042] During the construction of the pilot tunnel on the same tunnel sidewall, the front and rear distances of the tunnel face should be staggered by no less than 10m. The front and rear distances of the pilot tunnel faces of the first and second tunnels should be staggered by no less than 15m to avoid safety problems caused by excessive tunnel deformation and settlement due to mutual interference between the excavation of adjacent tunnel faces.

[0043] During the construction of the first and second tunnels, the distance between the core rock pillar and the working faces of the left and right pilot tunnels should be staggered by no less than 10m. When the core rock pillar is removed, it should be ensured that the closed-loop connection of each arch frame and the connection between arch frames are timely, firm and reliable to avoid stress mutation and deformation settlement caused by the removal of the arch crown. At the same time, it is necessary to ensure that the timing of the construction is closely related to the core rock pillar, and the distance between the core rock pillar and the removal of the core rock pillar is controlled within 15m. The initial support should not be exposed for a long time.

[0044] It should be noted that at the intersection of the connecting passage with the first and second tunnels, a combination of 42mm diameter steel pipe pre-supported small pipe sheds and I18 steel arch frames is used for initial support reinforcement to avoid spatial effects when the small cross-section tunnel is excavated upwards to the large cross-section tunnel, which could cause tunnel deformation and settlement. The same structural protection is also implemented at the intersection when the horizontal ventilation duct is excavated into the first and second tunnels. The specific materials are selected according to the actual situation.

[0045] When excavating the triangular area at the end of the first (or second) tunnel of the inclined pilot tunnel in the reverse direction, a 5-meter-long, 42mm-diameter small guide pipe is installed in the reverse direction on the upper section of the first (or second) tunnel pilot tunnel for advance support. At the initial support steel arch frame locking position, a 4-meter-long, 28mm-diameter self-advancing hollow grouting locking foot anchor rod is used instead of an ordinary steel bar anchor rod for reinforcement. An I25 steel support is set in its horizontal direction to restrain the horizontal convergence deformation of the upper section of the pilot tunnel sidewall of the first (or second) tunnel.

[0046] It should be further explained that the first and second tunnels, which are large-section tunnels, are constructed simultaneously. During construction, the front-to-back distance and construction step distance of the first (or second) tunnel face should be strictly controlled. Information technology should be used to monitor the tunnel and dynamically adjust the tunnel support parameters to effectively ensure the safe and rapid construction of the parallel double-island station tunnel.

[0047] See Figure 4 During the construction of the first and second tunnels, the construction area was divided and excavation was carried out in the order of the areas marked 1, 2, 3, 4, 5, 6, 7, 8, and 9 in the diagram. That is, the construction was carried out in the order of the two sides first and then the middle, and the upper part first and then the lower part, in order to excavate and construct the first and second tunnels.

[0048] Meanwhile, during the construction of the first and second tunnels, the distance between the tunnel face and the construction step distance were controlled according to the set distance, and tunnel detection was carried out through information technology to dynamically adjust the tunnel support parameters, thereby effectively ensuring the safe and rapid construction of the parallel double island station tunnel.

[0049] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for constructing a parallel double-island tunnel, characterized in that, Includes the following steps: A vertical shaft is constructed at a first predetermined location on the ground. After the vertical shaft is constructed, a horizontal ventilation duct is constructed at the bottom of the vertical shaft along the first predetermined construction direction toward a second predetermined location. As the horizontal air duct is constructed, a first tunnel and a second tunnel are sequentially built in the already formed horizontal air duct along the second preset construction direction, spaced apart from each other. During the construction of the first tunnel and the second tunnel, a connecting channel is set at a preset interval along the second preset construction direction. The connecting channel is used to connect the first tunnel and the second tunnel. During the construction of the horizontal air duct, the CD method and the step method are used to excavate the upper section of the horizontal air duct along the first preset construction direction to construct the first construction cross passage. In the already formed first construction cross passage, the upper section of the first tunnel and the upper section of the second tunnel are excavated along the second preset construction direction. During the excavation of the upper sections of the first tunnel and the second tunnel, after the upper section of the first tunnel reaches a preset distance, the upper section of the second tunnel is excavated simultaneously until the excavation of the upper sections of the first tunnel and the second tunnel is completed. During the excavation of the upper section of the first tunnel and the upper section of the second tunnel, the connecting channel is set at preset intervals between the upper sections of the first tunnel and the second tunnel that have been excavated. After the upper sections of the first tunnel and the second tunnel are excavated, the middle section and the lower section of the horizontal ventilation duct are excavated using the CD method and the step method to construct the second construction cross passage. In the already formed second construction cross passage, the lower section of the first tunnel and the lower section of the second tunnel are excavated along the second preset construction direction. During the excavation of the lower sections of the first tunnel and the second tunnel, after the lower section of the first tunnel reaches a preset distance, the lower section of the second tunnel is excavated simultaneously until the lower sections of the first tunnel and the second tunnel are excavated, so as to construct the complete first tunnel and the second tunnel. The preset spacing is 50 meters, the middle and lower sections of the horizontal air duct are staggered by 3-5 meters, and the tunnel faces of the first and second tunnels are staggered by no less than 15 meters.

2. The construction method for a parallel double-island tunnel according to claim 1, characterized in that, The first construction cross passage and the second construction cross passage constitute the horizontal ventilation duct.

3. The construction method for a parallel double-island tunnel according to claim 1, characterized in that, After the construction of the vertical shaft and the horizontal ventilation duct is completed, a gate is built in the vertical shaft. After the gate is built, the construction of the first tunnel and the second tunnel begins.

4. The construction method for a parallel double-island tunnel according to claim 1, characterized in that, During the construction of the first tunnel and the second tunnel, when removing the core rock pillar, the removal distance of the core rock pillar is controlled within 15 meters.

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