One-way multi-cavern underground excavation construction structure and construction method thereof

Abstract

The invention discloses a one-way multi-cavern underground excavation construction structure and a construction method thereof, and relates to the technical field of building construction.The construction structure comprises main tunnels symmetrically distributed on the two sides, a transverse channel is formed between the two main tunnels, and a middle tunnel is constructed on the basis of the transverse channel; an upper half part and a lower half part are arranged in the main tunnel, and the construction method is a triple arch rear middle hole method and comprises the following steps that firstly, during construction, the main tunnel bodies symmetrically distributed on the two sides are constructed, and when the main tunnel bodies are constructed, the upper portions of the main tunnel bodies are excavated firstly, and then the lower portions of the main tunnel bodies are excavated; secondly, a transverse channel is constructed between the main tunnels after construction on the two sides is completed; and thirdly, longitudinal excavation is conducted on the basis after construction of the transverse channel is completed, and a middle tunnel is constructed. According to the one-way multi-cavern underground excavation construction method, it can be guaranteed that the tunnel excavation safety is guaranteed, and meanwhile the influence on the surrounding stratum is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a unidirectional multi-cavity dark excavation construction structure and a construction method thereof. Background Art

[0002] At present, in the construction of multi-chamber dark excavation method, most of the time, multiple chambers are set up from the end of the working shaft and excavated forward. However, when the actual demand is to set up intermediate chambers from the middle, especially when multiple chambers are connected into a large chamber, the construction risk is relatively large. In particular, when there is an existing subway station on the top of the dark tunnel, the settlement caused by the excavation of multiple chambers will cause significant economic losses and greater social impact in serious cases.

[0003] In order to solve the above problems, the purpose of the present invention is that when a multi-chamber dark-excavation tunnel is located under an existing operating subway station and can only be excavated in one direction, the ordinary excavation plan cannot ensure the control of the surrounding environment by the multi-chamber dark-excavation. The present invention can ensure the safety of the dark-excavation tunnel itself to the greatest extent while ensuring the minimum impact on the surrounding environment, and at the same time ensuring the safety of the existing operating subway station. Summary of the invention

[0004] In view of the above technical problems, the present invention discloses a one-way multi-chamber dark excavation construction structure, comprising main tunnels symmetrically distributed on both sides, a transverse passage is arranged in the middle of the two main tunnels, an intermediate tunnel is constructed on the basis of the transverse passage, an upper half and a lower half are arranged in the main tunnel, the upper half comprises an upper excavation area 1 of the main tunnel and an upper excavation area 2 of the main tunnel, the lower half comprises a lower excavation area 1 of the main tunnel and a lower excavation area 2 of the main tunnel, temporary vertical supports for the main tunnel are arranged on the outer sides of the upper half and the lower half, locking anchor rods are arranged at the connection between the upper excavation area 1 of the main tunnel, the upper excavation area 2 of the main tunnel and the lower excavation area 1 of the main tunnel, the lower excavation area 2 of the main tunnel, a primary support of the main tunnel is arranged on the outer side of the main tunnel, a large pipe shed for the transverse passage is arranged between the two main tunnels, and the two ends of the large pipe shed for the transverse passage are respectively connected to the two main tunnels.

[0005] Furthermore, the transverse channel is arranged below the large pipe shed of the transverse channel. When constructing the transverse channel, it is necessary to construct supporting steel arch frames in the transverse channel. The supporting steel arch frames include the middle steel arch frames of the transverse channel, the side steel arch frames of the transverse channel, the temporary transverse steel arch frames of the transverse channel and the top transverse steel arch frames of the transverse channel.

[0006] Furthermore, when constructing the middle tunnel on the basis of the transverse passage, it is necessary to construct temporary support for the middle cavern in the transverse passage, as well as the advance support pipe shed for the middle cavern at the top and the initial support for the transverse passage, wherein the initial support for the transverse passage is located on the inner side of the advance support pipe shed for the middle cavern.

[0007] Furthermore, after the construction of the intermediate tunnel is completed on the basis of the transverse passage, it is excavated downward in the longitudinal direction of the transverse passage. After the excavation is completed, an intermediate cavern floor is set on the longitudinal bottom end of the intermediate tunnel, and an intermediate cavern vault secondary lining is set on the inner side of the primary support of the transverse passage.

[0008] The present invention also provides a one-way multi-cavity dark excavation construction method, comprising the following steps:

[0009] Step 1: During construction, first construct the main tunnels symmetrically distributed on both sides. When constructing the main tunnel, first excavate the upper excavation area 1 and the upper excavation area 2 of the main tunnel. Then, install locking anchor rods on the basis of the excavation of the upper excavation area 1 and the upper excavation area 2 of the main tunnel. After the locking anchor rods are installed, excavate the lower excavation area 1 and the lower excavation area 2 of the main tunnel. After the excavation of the lower excavation area 1 and the lower excavation area 2 of the main tunnel, construct the second lining of the main tunnel. When constructing the second lining of the main tunnel, a large pipe shed for a cross passage should be installed horizontally between the main tunnels on both sides.

[0010] Step 2: construct a transverse passage between the main tunnels after construction on both sides. When constructing the transverse passage, it is necessary to perform transverse excavation between the main tunnels after construction on both sides. When excavating the upper part of the transverse passage, first excavate gradually in an oblique direction and splice half of it through the middle steel arch frame of the transverse passage, the side steel arch frame of the transverse passage and the temporary transverse steel arch frame of the transverse passage, and then excavate gradually in the reverse direction. After the excavation is completed, the temporary transverse steel arch frame of the transverse passage is removed and the entire splicing is completed through the middle steel arch frame of the transverse passage, the side steel arch frame of the transverse passage and the transverse steel arch frame on the top of the transverse passage;

[0011] Step 3: After the construction of the transverse passage is completed, longitudinal excavation is carried out to construct the intermediate tunnel.

[0012] Furthermore, in the step 1, the primary branches of the main tunnel are constructed on the main tunnels on both sides, and the construction height of the primary branches of the main tunnel should be increased at the position of the cross passage during the construction.

[0013] A one-way multi-chamber dark excavation construction method as described in the claim is characterized in that: in the step 2, the construction of the primary support of the main tunnel and the secondary lining of the main tunnel should be completed on the main tunnel first, and then the construction of the cross passage should be carried out, and when the secondary lining of the main tunnel is being constructed, the vertical temporary support of the main tunnel in the main tunnel should be separated and dismantled one by one.

[0014] Furthermore, in step three, after the construction of step two is completed, the upper part of the transverse channel is excavated and the primary support of the transverse channel, the secondary lining of the transverse channel and the secondary lining of the middle cavern vault are constructed. After the upper part of the transverse channel is constructed, the lower part of the transverse channel is excavated and the middle cavern floor is constructed.

[0015] Furthermore, before constructing the initial branch of the transverse channel, a temporary small transverse duct should be constructed first.

[0016] Compared with the prior art, the present invention has the following advantages: (1) by excavating the upper soil and then the lower soil to excavate the main channels on both sides, the deformation of the upper soil can be controlled within a relatively small impact range; (2) by first constructing the main channels on both sides and then excavating the middle tunnel, the stability and safety of the tunnel itself can be ensured; (3) by gradually raising and excavating the cross channel in two turns, the stability of the surrounding soil can be ensured during the excavation of the cross channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the planar structure of the present invention.

[0018] Figure 2 It is a structural schematic diagram of step one in the present invention.

[0019] Figure 3 The structure diagram of step 2 in the present invention is shown in FIG. Figure 1 .

[0020] Figure 4 The structure diagram of step 2 in the present invention is shown in FIG. Figure 2 .

[0021] Figure 5 The schematic diagram of the mechanism of step 3 in the present invention is Figure 1 .

[0022] Figure 6 This is a schematic diagram of the structure of step three in the present invention. Figure 2 .

[0023] Figure numbers: 1-main tunnel; 2-transverse passage; 3-middle tunnel; 4-large pipe shed for transverse passage; 5-temporary cross brace; 6-primary support of main tunnel; 7-netting spraying and mixing area; 8-temporary small duct for transverse passage; 9-middle steel arch frame of transverse passage; 10-side steel arch frame of transverse passage; 11-temporary transverse steel arch frame of transverse passage; 12-transverse steel arch frame at top of transverse passage; 13-secondary lining of transverse passage; 14-primary support of transverse passage; 15-advance support pipe shed for middle cavern; 16-temporary support for middle cavern; 17-secondary lining of arch top of middle cavern; 18-floor of middle cavern; 19-locking anchor rod; 20-upper excavation area one of main tunnel; 21-upper excavation area two of main tunnel; 22-lower excavation area one of main tunnel; 23-lower excavation area two of main tunnel; 24-vertical temporary support for main tunnel. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0025] Embodiment: As shown in the figure, a one-way multi-chamber dark excavation construction structure includes main tunnels 1 symmetrically distributed on both sides, a transverse passage 2 is arranged in the middle of the two main tunnels 1, an intermediate tunnel 3 is constructed on the basis of the transverse passage 2, an upper half and a lower half are arranged in the main tunnel 1, the upper half includes the main tunnel upper excavation area 1 20 and the main tunnel upper excavation area 21, the lower half includes the main tunnel lower excavation area 1 22 and the main tunnel lower excavation area 23, the outer sides of the upper half and the lower half are both provided with main tunnel vertical temporary supports 24, the main tunnel upper excavation area 1 20, the main tunnel upper excavation area 21 and the main tunnel lower excavation area 1 22, the main tunnel lower excavation area 23 are connected at the joints, the main tunnel primary support 6 is arranged on the outer side of the main tunnel 1, and a transverse passage large pipe shed 4 is arranged between the two main tunnels 1. The two ends are respectively connected to the two main tunnels 1, and the transverse channel 2 is arranged below the large pipe shed 4 of the transverse channel. When constructing the transverse channel 2, it is necessary to construct a supporting steel arch frame in the transverse channel 2, and the supporting steel arch frame includes a steel arch frame 9 in the middle of the transverse channel, a steel arch frame 10 on the side of the transverse channel, a temporary transverse steel arch frame 11 of the transverse channel, and a transverse steel arch frame 12 on the top of the transverse channel. When constructing the intermediate tunnel 3 on the basis of the transverse channel 2, it is necessary to construct a temporary support 16 for the intermediate cavern in the transverse channel 2, as well as an advanced support pipe shed 15 for the intermediate cavern at the top and an initial support 14 for the transverse channel. The initial support 14 for the transverse channel is located on the inner side of the advanced support pipe shed 15 for the intermediate cavern. After the intermediate tunnel 3 is constructed on the basis of the transverse channel 2, it is excavated downward in the longitudinal direction of the transverse channel 2. After the excavation is completed, an intermediate cavern floor 18 is arranged on the longitudinal bottom end of the intermediate tunnel 3, and an intermediate cavern vault secondary lining 17 is arranged on the inner side of the initial support 14 of the transverse channel.

[0026] A one-way multi-cavity dark excavation construction method comprises the following steps:

[0027] Step 1: During construction, the main tunnel 1 with symmetrical distribution on both sides is constructed first. When constructing the main tunnel 1, the upper excavation area 1 20 and the upper excavation area 21 of the main tunnel are excavated first, and then the locking anchor rod 19 is installed on the basis of the excavation of the upper excavation area 1 20 and the upper excavation area 21 of the main tunnel. After the locking anchor rod 19 is installed, the lower excavation area 1 22 and the lower excavation area 23 of the main tunnel are excavated. After the excavation of area 1 22 and area 2 23 below the main tunnel is completed, the main tunnel vertical temporary support 24 is constructed in the main tunnels 1 on both sides, and the main tunnels 1 on both sides are penetrated. The main tunnel primary support 6 is constructed on the main tunnels 1 on both sides. When constructing the main tunnel primary support 6, the construction height of the main tunnel primary support 6 should be increased at the position of the cross passage 2. A large pipe shed 4 for the cross passage is horizontally set between the main tunnels 1 on both sides, and the secondary lining of the main tunnel is constructed. The vertical temporary support 24 of the main tunnel is removed one by one.

[0028] Step 2: construct the transverse passage 2 between the main tunnels 1 after the construction on both sides. When constructing the transverse passage 2, it is necessary to carry out transverse excavation between the main tunnels 1 after the construction on both sides. When excavating the upper part of the transverse passage 2, first set a temporary cross brace 5 between the longitudinal beam of the main tunnel 1 and the primary support 6 of the main tunnel, and then open a hole at the corresponding position of the longitudinal beam of the main tunnel 1 and the primary support 6 of the main tunnel. First, set up a temporary small duct 8 for transverse passage, and then dig obliquely from left to right step by step and splice from low to high through the middle steel arch frame 9 of the transverse passage, the side steel arch frame 10 of the transverse passage, and the temporary transverse steel arch frame 11 of the transverse passage, set up one frame every 0.5 meters, and then gradually excavate in the reverse direction. After the excavation is completed, remove the temporary transverse steel arch frame 11 of the transverse passage from right to left one by one and connect it to the top of the transverse passage 2 through the side steel arch frame 10 of the transverse passage, and then set up the transverse steel arch frame 12 on the top of the transverse passage. At this time, the upper part of the transverse passage 2 is completed;

[0029] Step three: After the construction of the transverse channel 2 is completed, longitudinal excavation is carried out to construct the intermediate tunnel 3. After the construction of step two is completed, the intermediate cavern advance support pipe shed 15 is longitudinally installed in the transverse channel 2. The intermediate cavern advance support pipe shed 15 is located on the inner side of the transverse channel primary support 14. After the installation of the intermediate cavern advance support pipe shed 15 is completed, the transverse channel secondary lining 13 in the transverse channel 2 is constructed, and then the guide hole on the upper part of the intermediate tunnel 3 is excavated, and then the transverse channel primary support 14 and the intermediate cavern temporary support 16 are erected. After the installation of the transverse channel primary support 14 and the intermediate cavern temporary support 16 is completed, the intermediate cavern vault secondary lining 17 is constructed, and the lower part of the transverse channel 2 is excavated. After the excavation is completed, the intermediate cavern floor 18 is constructed. At this time, the intermediate tunnel 3 is completed.

[0030] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0032] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A one-way multi-chamber dark excavation construction structure, characterized in that: The invention comprises main tunnels (1) symmetrically distributed on both sides, a transverse passage (2) is arranged between the two main tunnels (1), an intermediate tunnel (3) is constructed on the basis of the transverse passage (2), an upper half and a lower half are arranged in the main tunnel (1), the upper half comprises a main tunnel upper excavation area 1 (20) and a main tunnel upper excavation area 2 (21), the lower half comprises a main tunnel lower excavation area 1 (22) and a main tunnel lower excavation area 2 (23), and the outer sides of the upper half and the lower half are A temporary vertical support (24) for the main tunnel is provided, and locking anchor rods (19) are provided at the connection points between the main tunnel upper excavation area 1 (20), the main tunnel upper excavation area 2 (21) and the main tunnel lower excavation area 1 (22), the main tunnel lower excavation area 2 (23), and a main tunnel primary support (6) is provided on the outer side of the main tunnel (1). A transverse channel large pipe shed (4) is provided between the two main tunnels (1), and the two ends of the transverse channel large pipe shed (4) are respectively connected to the two main tunnels (1).

2. A one-way multi-chamber dark excavation construction structure as claimed in claim 1, characterized in that: The transverse channel (2) is arranged below the transverse channel large pipe shed (4). When constructing the transverse channel (2), a supporting steel arch frame needs to be constructed inside the transverse channel (2). The supporting steel arch frame includes a transverse channel middle steel arch frame (9), a transverse channel side steel arch frame (10), a transverse channel temporary transverse steel arch frame (11) and a transverse channel top transverse steel arch frame (12).

3. A one-way multi-chamber dark excavation construction structure as claimed in claim 2, characterized in that: When constructing the intermediate tunnel (3) on the basis of the transverse passage (2), it is necessary to construct a temporary support (16) for the intermediate cavern in the transverse passage (2) as well as an advanced support pipe shed (15) for the intermediate cavern at the top and an initial support (14) for the transverse passage, wherein the initial support (14) for the transverse passage is located on the inner side of the advanced support pipe shed (15) for the intermediate cavern.

4. A one-way multi-chamber dark excavation construction structure as claimed in claim 3, characterized in that: After the intermediate tunnel (3) is constructed on the basis of the transverse passage (2), it is excavated downward in the longitudinal direction of the transverse passage (2). After the excavation is completed, an intermediate cavern floor (18) is arranged on the longitudinal bottom end of the intermediate tunnel (3), and an intermediate cavern vault secondary lining (17) is arranged on the inner side of the transverse passage primary support (14).

5. A one-way multi-chamber dark excavation construction method, characterized in that: The steps include: Step 1: During construction, first construct the main tunnels (1) symmetrically distributed on both sides. When constructing the main tunnel (1), first excavate the upper excavation area 1 (20) and the upper excavation area 2 (21) of the main tunnel. Then, after the upper excavation area 1 (20) and the upper excavation area 2 (21) of the main tunnel are excavated, install the locking anchor rods (19). After the locking anchor rods (19) are installed, excavate the lower excavation area 1 (22) and the lower excavation area 2 (23) of the main tunnel. After the lower excavation area 1 (22) and the lower excavation area 2 (23) of the main tunnel are excavated, construct the secondary lining of the main tunnel. When constructing the secondary lining of the main tunnel, first install the large pipe shed (4) of the cross passage between the main tunnels (1) on both sides. Step 2: construct a transverse passage (2) between the main tunnels (1) after construction on both sides. When constructing the transverse passage (2), it is necessary to perform transverse excavation between the main tunnels (1) after construction on both sides. When excavating the upper part of the transverse passage (2), first excavate gradually in an oblique direction and splice half of it through the middle steel arch frame (9) of the transverse passage, the side steel arch frame (10) of the transverse passage and the temporary transverse steel arch frame (11) of the transverse passage, and then excavate gradually in the reverse direction. After the excavation is completed, the temporary transverse steel arch frame (11) of the transverse passage is removed and the entire splicing is completed through the middle steel arch frame (9) of the transverse passage, the side steel arch frame (10) of the transverse passage and the transverse steel arch frame (12) at the top of the transverse passage; Step 3: After the construction of the transverse passage (2) is completed, longitudinal excavation is carried out to construct the intermediate tunnel (3).

6. A one-way multi-cavity dark excavation construction method as claimed in claim 5, characterized in that: In the step 1, the primary branch of the main tunnel (6) is constructed on the main tunnel (1) on both sides. When constructing the primary branch of the main tunnel (6), the construction height of the primary branch of the main tunnel (6) should be increased at the position of the transverse passage (2).

7. A one-way multi-cavity dark excavation construction method as claimed in claim 5, characterized in that: In the second step, the construction of the primary support (6) and the secondary lining of the main tunnel should be completed on the main tunnel (1), and then the construction of the cross passage (2) should be carried out. When the secondary lining of the main tunnel is being constructed, the vertical temporary support (24) of the main tunnel in the main tunnel (1) should be separated and removed one by one.

8. A one-way multi-cavity dark excavation construction method as claimed in claim 5, characterized in that: In step three, after step two is completed, the upper part of the transverse passage (2) is excavated, and then the primary support (14) of the transverse passage, the secondary lining (13) of the transverse passage, and the secondary lining (17) of the intermediate cavern vault are constructed. After the upper part of the transverse passage (2) is constructed, the lower part of the transverse passage (2) is excavated and the intermediate cavern floor (18) is constructed.

9. A one-way multi-cavity dark excavation construction method as claimed in claim 8, characterized in that: Before constructing the initial branch (14) of the transverse passage, a temporary small transverse conduit (8) should be constructed.

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