阅读说明：本技术 一种地铁叠线区间隧道联络通道结构及施工方法 (Subway laminated line interval tunnel connection channel structure and construction method ) 是由 唐志辉 张存 雷明锋 刘讴 王东存 李海洋 李锦� 蒋礼平 宁超 熊清华 于 2021-09-18 设计创作，主要内容包括：一种地铁叠线区间隧道联络通道结构及施工方法,本发明涉及隧道施工技术领域；右线盾构隧道横向通道贯通连接在右线盾构隧道的侧壁上；左线盾构隧道位于右线盾构隧道的左下方；左线盾构隧道横向通道贯通连接在左线盾构隧道的侧壁上；右线盾构隧道横向通道与左线盾构隧道横向通道之间利用联络通道贯通连接；所述联络通道内设置楼梯,楼梯中连通有休息平台。能够解决左右线区间隧道大高差无法直接用横向通道联络的问题,通过合理安排各开挖施工步骤,采用刚性隔离桩与地层注浆的方式减少联络通道施工时对既有左右区间隧道的扰动,首先完成横向通道的开洞与开挖,然后再进行联络通道的开挖,并及时进行初期支护和二次衬砌浇注。(The invention relates to a subway superimposed line interval tunnel connection channel structure and a construction method, which relate to the technical field of tunnel construction; the transverse channel of the right shield tunnel is communicated and connected with the side wall of the right shield tunnel; the left line shield tunnel is positioned at the left lower part of the right line shield tunnel; the transverse channel of the left line shield tunnel is communicated and connected with the side wall of the left line shield tunnel; the right shield tunnel transverse channel is communicated with the left shield tunnel transverse channel by using a communication channel; the communication channel is internally provided with a stair, and the stair is communicated with a rest platform. The problem that the big difference in height of tunnel can't directly use the cross passage to contact about can solving, through each excavation construction step of rational arrangement, to the disturbance of interval tunnel about existing when adopting the mode of rigidity isolation stake and stratum slip casting to reduce the contact passageway construction, at first accomplish the opening and the excavation of cross passage, then carry out the excavation of contact passageway again to in time carry out preliminary bracing and secondary lining pouring.)

1. The utility model provides a subway superimposed line interval tunnel contact access structure which characterized in that: it comprises the following steps:

the height difference between the right line shield tunnel (1) and the off-line shield tunnel is larger;

the right shield tunnel transverse channel (2), the right shield tunnel transverse channel (2) is connected on the side wall of the right shield tunnel (1) in a penetrating way;

the left line shield tunnel (3), the left line shield tunnel (3) is positioned at the lower left of the right line shield tunnel (1);

the left line shield tunnel transverse channel (4), the left line shield tunnel transverse channel (4) is connected on the side wall of the left line shield tunnel (3) in a penetrating way;

the right shield tunnel transverse channel (2) is communicated with the left shield tunnel transverse channel (4) through a communication channel; the communication channel is internally provided with a stair which is provided with a handrail and a rest platform.

2. A subway line section tunnel communication channel structure as claimed in claim 1, wherein: the connecting channel is a longitudinal channel (5), the distance between the central lines of the right shield tunnel (1) and the left shield tunnel (3) is larger, namely S is larger than or equal to D +2 XP + B, the height difference between the right shield tunnel (1) and the left shield tunnel (3) is larger, namely H is more than (S-D-4) x tan30 degrees, D is the diameter of the shield tunnel, namely the diameter of the right shield tunnel and the diameter of the left shield tunnel, P is a construction safety distance, B is a connecting excavation width, H is a tunnel height difference, namely the height difference between the right shield tunnel and the left shield tunnel, and S is the distance between the central lines; the longitudinal channel (5) is arranged in a Z-shaped structure and is spatially parallel to the right shield tunnel (1) and the left shield tunnel (3); the stairs are single-run stairs (17) and the horizontal inclination angle is 30 degrees.

3. A subway line section tunnel communication channel structure as claimed in claim 1, wherein: the connecting channel is a vertical channel (6), the distance between the central lines of the right shield tunnel (1) and the left shield tunnel (3) is smaller, namely S is less than D +2 XP + B, the height difference between the right shield tunnel (1) and the left shield tunnel (3) is larger, namely H is more than (S-D-4) x tan30 degrees, D is the diameter of the shield tunnel, namely the diameter of the right shield tunnel and the diameter of the left shield tunnel, P is a construction safety distance, B is a connecting excavation width, H is the height difference of the tunnel, namely the height difference between the right shield tunnel and the left shield tunnel, and S is the distance between the central lines; the vertical channel (6) is arranged in a C-shaped structure and is spatially perpendicular to the right shield tunnel (1) and the left shield tunnel (3); the stairs are double-running stairs (16).

4. A construction method of a subway superimposed line interval tunnel connection channel structure is characterized by comprising the following steps: the construction steps are as follows:

the method comprises the following steps that (I), a rigid isolation pile (12) is used for isolating the area where the communication channel is located;

step two, adopting a shield machine to finish the construction of the right shield tunnel (1) and the left shield tunnel (3) in sequence;

step three, completing transverse opening of the right shield tunnel (1), wherein before opening, shield segments at the opening are supported and reinforced by portal frame type section steel, and core pulling detection is carried out on soil in a range of a connecting channel to ensure that surrounding rocks have good stability and water stopping and water resisting properties; before the transverse channel (2) of the right shield tunnel is excavated, an arch part advanced small guide pipe (14) is arranged, grouting reinforcement is carried out on the stratum, the transverse channel is excavated, and then primary support and secondary lining are completed; a frame-surrounding beam (7) needs to be poured at the opening connection part of the right shield tunnel (1) and the right shield tunnel transverse passage (2), a deformation joint (8) is arranged, and a space for installing a fireproof door (10) is reserved;

step four, transverse opening of the left shield tunnel (3) is completed, shield segments at the opening are supported and reinforced by portal type section steel before opening, and loose core detection is carried out on soil in the range of the connecting channel, so that the surrounding rock is ensured to have good stability and water stopping and water resisting properties; before the transverse channel (4) of the left shield tunnel is excavated, an arch part advanced small guide pipe (14) is arranged, grouting reinforcement is carried out on the stratum, the transverse channel is excavated, and then primary support and secondary lining are completed; a frame-surrounding beam (7) needs to be poured at the opening connection part of the left-line shield tunnel (3) and the left-line shield tunnel transverse passage (4), a deformation joint (8) is arranged, and a space for installing a fireproof door (10) is reserved;

fifthly, opening a hole in the connection channel, dismantling a reinforcing steel frame (11) at the position where the hole is opened in the transverse channel, excavating the connection channel, and finishing primary support and secondary lining;

and step six, finishing stair pouring, and finishing the installation of the fireproof door (10) and the handrail.

5. The construction method of the subway laminated line section tunnel connection channel structure as claimed in claim 3, wherein: and drainage ditches (9) are arranged on the left side and the right side of the right shield tunnel transverse channel (2), the left shield tunnel transverse channel (4) and the left communication channel.

6. The construction method of the communication channel structure of the subway stacking line section tunnel as claimed in claim 3, when the communication channel is a longitudinal channel (5), the construction is carried out by adopting a mining method, the main structure adopts C40 impervious concrete, the whole is waterproof, the fireproof door and the civil air defense door frame wall adopt C35 common concrete; the longitudinal channel (5) is in a step shape, and the bottom plate is provided with stair steps and a rest platform; before longitudinal channel (5) excavates, before right side shield tunnel lateral passage (2) and left side shield tunnel lateral passage (4) excavate, establish the leading little pipe of hunch portion (14), its general arrangement mode is: the external inserting angle is 30 degrees, the circumferential distance is 0.3m, the length is 3.5m, the arch parts are arranged according to 120 degrees, the surrounding stratum is subjected to grouting reinforcement through a small guide pipe, the excavation of a longitudinal channel (5) is completed, and primary support and secondary lining are completed; the general construction sequence of the longitudinal channel (5) is as follows: adding a waterproof layer, primary supporting, pouring 70mmC20 fine stone concrete, secondary lining and pouring a bottom plate 50mm cement mortar leveling layer; when the longitudinal channel (5) is subjected to secondary lining pouring, handrail anchoring parts are reserved on the side walls of the two sides, so that the stainless steel handrail can be conveniently installed in the later period.

7. The construction method of the communication channel structure of the subway stacking line section tunnel according to claim 3, when the communication channel is a vertical channel (6), temporary supports (13) are adopted to support the surrounding strata and structures during excavation, the construction is conducted from top to bottom in a layered mode, the main structure is made of C40 impervious concrete, the structure is fully-enclosed and waterproof, and the main structure is made of C35 common concrete for fire doors and civil air defense door frame walls; the arch buckling part of the vertical channel (6) adopts a small advanced conduit (14) for grouting, and the general arrangement mode is as follows: the external inserting angle is 30 degrees, the circumferential distance is 0.3m, the length is 3.5m, the arch parts are arranged according to 120 degrees, the surrounding strata are grouted and reinforced through small guide pipes, the excavation of the arch buckling part of the vertical channel (6) is completed, and primary support and secondary lining are completed; vertical passageway (6) hole body part is inside to set up the dual-race stair to set up the rest platform, before the excavation, adopt slip casting anchor pipe (15) to carry out the interior curtain slip casting of hole, from the top down the layering is excavated, and general construction order is as follows: adding a waterproof layer, primary supporting, pouring 70mmC20 fine stone concrete, secondary lining and pouring a bottom plate 50mm cement mortar leveling layer; when the secondary lining of the body part of the vertical channel (6) is poured, later-stage stair steel bars and handrail anchoring parts are reserved on the side walls, so that later-stage stair pouring and stainless steel handrail installation are facilitated.

Technical Field

The invention relates to the technical field of tunnel construction, in particular to a subway superimposed line section tunnel connection channel structure and a construction method.

Background

In the design of the connection channel of the subway section tunnel, the tunnel between the left line and the right line is generally connected in a transverse connection mode. However, with the large-scale construction of urban subways and the increasing complexity of underground space conditions traversed by subway tunnels, tunnel sections with superimposed lines and large height difference of left and right lines appear, and transverse channels cannot be adopted for direct connection. In addition, as the subway tunnel passes through the underground space of the city, the condition of passing through the adjacent important buildings can occur. How to complete the high-efficiency safe construction of the tunnel connection channel between the subway superposed lines with large height difference of the left and right lines under the condition of ensuring the safety of the nearby buildings becomes an inevitable problem in the design and construction of the urban subway.

Disclosure of Invention

The invention aims to provide a subway laminated line interval tunnel connection channel structure and a construction method, which can solve the problem that the large height difference of a tunnel between a left line and a right line cannot be directly connected by a transverse channel, reduce the disturbance of the existing tunnel between the left section and the right section during the construction of the connection channel by reasonably arranging each excavation construction step and adopting a rigid isolation pile and stratum grouting mode, firstly complete the opening and excavation of the transverse channel, then excavate the connection channel, and timely perform primary support and secondary lining pouring.

In order to achieve the above object, the invention provides a subway line segment tunnel communication channel structure, comprising:

the height difference between the right-line shield tunnel and the lower-line shield tunnel is larger;

the right shield tunnel transverse channel is connected on the side wall of the right shield tunnel in a penetrating way;

the left line shield tunnel is positioned at the lower left side of the right line shield tunnel, and the distance between the central lines of the right line shield tunnel and the left line shield tunnel reaches 13.435 m;

the left line shield tunnel transverse channel is connected to the side wall of the left line shield tunnel in a penetrating manner;

the right shield tunnel transverse channel is communicated with the left shield tunnel transverse channel by the communication channel; the communication channel is internally provided with a stair which is provided with a handrail and a rest platform.

Preferably, the connection channel is a longitudinal channel, and at this time, the distance between the central lines of the right-line shield tunnel and the left-line shield tunnel is larger, that is, S is greater than or equal to D +2 × P + B, and the height difference between the right-line shield tunnel and the left-line shield tunnel is larger, that is, H > (S-D-4) × tan30 °, where D is the diameter of the shield tunnel (that is, the diameter of the right-line shield tunnel and the diameter of the left-line shield tunnel), P is the construction safety distance, B is the connection excavation width, H is the tunnel height difference (that is, the height difference between the right-line shield tunnel and the left-line shield tunnel), and S is the distance between the central lines; the longitudinal channel is arranged in a Z-shaped structure and is spatially parallel to the right line shield tunnel and the left line shield tunnel; the stairs are single-run stairs, and the horizontal inclination angle is 30 degrees.

Preferably, the connection channel is a vertical channel, and at this time, the distance between the center lines of the right shield tunnel and the left shield tunnel is smaller, i.e., S is less than D +2 × P + B, and the height difference between the right shield tunnel and the left shield tunnel is larger, i.e., H > (S-D-4) × tan30 °, where D is the diameter of the shield tunnel (i.e., the diameter of the right shield tunnel and the diameter of the left shield tunnel), P is a construction safety distance, B is a connection excavation width, H is a tunnel height difference (i.e., the height difference between the right shield tunnel and the left shield tunnel), and S is the distance between the center lines; the vertical channel is arranged in a C-shaped structure and is spatially perpendicular to the right shield tunnel and the left shield tunnel; the stairs are dual-run stairs.

The construction method of the subway laminated line interval tunnel connection channel comprises the following construction steps:

firstly, isolating the area where the contact channel is located by using a rigid isolation pile;

step two, adopting a shield tunneling machine to finish the construction of a right shield tunneling and a left shield tunneling in sequence;

thirdly, transverse opening of the right shield tunnel is completed, shield segments at the opening are supported and reinforced by portal frame type section steel before opening, and core pulling detection is carried out on soil in the range of the connecting channel to ensure that surrounding rocks have good stability and water stopping and water resisting properties; before excavating the transverse channel of the right shield tunnel, constructing an arch part advanced small guide pipe, grouting and reinforcing the stratum, excavating the transverse channel, and then finishing primary support and secondary lining; the right shield tunnel transverse passage is arranged at the opening connection part of the right shield tunnel, a ring frame beam needs to be poured, a deformation joint is arranged, and meanwhile, a space for installing a fireproof door is reserved. (ii) a

Fourthly, transverse opening of the left shield tunnel is completed, shield segments at the opening are supported and reinforced by portal frame type section steel before opening, and core pulling detection is carried out on soil in the range of the connecting channel to ensure that surrounding rocks have good stability and water stopping and water resisting properties; before excavating a transverse channel of the left shield tunnel, constructing an arch part advanced small guide pipe, grouting and reinforcing the stratum, excavating the transverse channel, and then finishing primary support and secondary lining; a ring frame beam is required to be poured at the position of a left-line shield tunnel transverse passage, which is connected with a left-line shield tunnel opening, a deformation joint is arranged, and a space for installing a fireproof door is reserved;

fifthly, opening a hole in the connection channel, dismantling the reinforcing steel frame at the position where the hole is opened in the transverse channel, excavating the connection channel, and finishing primary support and secondary lining;

and step six, finishing stair pouring and finishing the installation of the fireproof door and the handrail.

Preferably, drainage ditches are arranged on the left side and the right side of the right shield tunnel transverse channel, the left shield tunnel transverse channel and the communication channel.

Preferably, when the communication channel is a longitudinal channel, the construction is carried out by adopting a mining method, the main structure adopts C40 impervious concrete, the whole bag is waterproof, and the fireproof door and the civil air defense door frame wall adopt C35 common concrete; the longitudinal channel is in a step shape, and the bottom plate is provided with stair steps and a rest platform; before the longitudinal channel is excavated, before the right shield tunnel transverse channel and the left shield tunnel transverse channel are excavated, an arch part advanced small conduit is arranged, and the general arrangement mode is as follows: the external inserting angle is 30 degrees, the circumferential distance is 0.3m, the length is 3.5m, the arch parts are arranged according to 120 degrees, the surrounding strata are grouted and reinforced through small guide pipes, the excavation of a longitudinal channel is completed, and the primary support and the secondary lining are completed; the general construction sequence of the longitudinal channel is as follows: adding a waterproof layer, primary supporting, pouring 70mmC20 fine stone concrete, secondary lining and pouring a bottom plate 50mm cement mortar leveling layer; when the longitudinal channel is subjected to secondary lining pouring, the handrail anchoring parts are reserved on the side walls of the two sides, so that the stainless steel handrail can be conveniently installed at the later stage.

Preferably, when the communication channel is a vertical channel, temporary supports are required to support surrounding strata and structures during excavation, the construction is performed layer by layer from top to bottom, the main structure adopts C40 impervious concrete, the door is completely covered and waterproof, and the fireproof door and the civil air defense door frame wall adopt C35 common concrete; the arch buckling part of the vertical channel adopts advanced small conduit grouting, and the general arrangement mode is as follows: the external insertion angle is 30 degrees, the circumferential distance is 0.3m, the length is 3.5m, the arch parts are arranged according to 120 degrees, the surrounding strata are grouted and reinforced through small guide pipes, the excavation of the arch buckling part of the vertical channel is completed, and primary support and secondary lining are completed; vertical passageway hole body part is inside to set up the dual-race stair to set up rest platform, before the excavation, adopt slip casting anchor pipe to carry out the interior curtain slip casting of hole, from the top the layering is excavated, and general construction order is as follows: adding a waterproof layer, primary supporting, pouring 70mmC20 fine stone concrete, secondary lining and pouring a bottom plate 50mm cement mortar leveling layer; when the secondary lining of the vertical channel body part is poured, later-stage stair steel bars and handrail anchoring parts are reserved on the side walls, so that later-stage pouring of the stairs and installation of stainless steel handrails are facilitated.

Compared with the prior art, the invention has the beneficial effects that: the invention provides a subway superimposed line interval tunnel connection channel structure and a construction method, which can solve the problem that the large height difference of tunnels between a left line and a right line cannot be directly connected by a transverse channel, reduce the disturbance of the existing tunnel between the left section and the right section during the construction of the connection channel by reasonably arranging all excavation construction steps and adopting a rigid isolation pile and stratum grouting mode, firstly complete the opening and the excavation of the transverse channel, then excavate the connection channel, and timely perform primary support and secondary lining pouring.

Description of the drawings:

fig. 1 is a cross sectional view showing the relationship between the communication passage and the right shield tunnel and the left shield tunnel according to the present invention.

Fig. 2 is a schematic plan view of the present invention in which the communication channel is a longitudinal channel.

Fig. 3 is a schematic cross-sectional view of the present invention in which the communication channel is a longitudinal channel.

Fig. 4 is a schematic construction view of the present invention in which the communication passage is a longitudinal passage.

Fig. 5 is a schematic sectional view of the present invention in which the communication channel is a vertical channel.

Fig. 6 is a schematic plan view of the position of the transverse passage of the shield tunnel on the right line when the communication passage is a vertical passage in the present invention.

Fig. 7 is a schematic plan view of the horizontal passage of the shield tunnel at the left line when the communication passage is a vertical passage.

Fig. 8 is a schematic construction view of the present invention in which the communication passage is a vertical passage.

Fig. 9 is an enlarged view of a portion a in fig. 2.

Fig. 10 is an enlarged view of a portion B in fig. 2.

Fig. 11 is an enlarged view of the portion C in fig. 3.

FIG. 12 is a schematic plan view of the fourth embodiment.

FIG. 13 is a schematic sectional view of the fourth embodiment.

Description of reference numerals:

the tunnel comprises a right-side shield tunnel 1, a right-side shield tunnel transverse passage 2, a left-side shield tunnel 3, a left-side shield tunnel transverse passage 4, a longitudinal passage 5, a vertical passage 6, a ring frame beam 7, a deformation joint 8, a drainage ditch 9, a fireproof door 10, a reinforcing steel frame 11, a rigid isolation pile 12, a temporary support 13, an advanced small conduit 14, a grouting anchor rod 15, a double-race stair 16 and a single-race stair 17.

The specific implementation mode is as follows:

the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings, and the preferred embodiments in the description are only examples, and all other embodiments obtained by those skilled in the art without any inventive work belong to the protection scope of the present invention.

In the specific embodiment, D is the diameter of the shield tunnel, P is the construction safety distance, B is the contact excavation width, H is the height difference of the tunnel, and S is the distance between central lines; when the tunnel height difference H is large, i.e., H > (S-D-4) × tan30 °, it is impossible to arrange the cross connecting channels at the maximum slope, and only the longitudinal channels or the vertical channels can be arranged in the tunnel direction.

The first embodiment is as follows:

as shown in FIGS. 1-4 and 9-11, in the present embodiment, the right shield tunnel 1 and the left shield tunnel 2 have a large left-right distance and a large vertical height difference, i.e. H > (S-D-4) × tan30 °, and S ≧ D +2 × P + B, the middle longitudinal channel 5 can be arranged along the tunnel direction, and the construction steps are as follows:

firstly, constructing a rigid isolation pile 12;

step two, completing construction of the right shield tunnel 1 by adopting a shield machine;

thirdly, completing construction of the left shield tunnel 3 by adopting a shield machine;

fourthly, opening the right shield tunnel 1 and excavating a right shield tunnel transverse channel 2;

fifthly, completing excavation of the transverse channel 2 of the right shield tunnel, and completing primary support and secondary lining;

sixthly, completing the opening of the left shield tunnel 3, and excavating a transverse channel 4 of the right shield tunnel;

seventhly, completing excavation of the transverse channel 4 of the left shield tunnel, and completing primary support and secondary lining;

eighthly, forming holes in a longitudinal channel 5 of the communication channel;

step nine, excavating a longitudinal channel of the communication channel, and finishing primary support and secondary lining;

and step ten, completing the installation of the fireproof door 10 and the stair handrail in the communication channel system.

After adopting above-mentioned structure, this embodiment's beneficial effect is as follows: the specific embodiment provides a subway superposed line interval tunnel connection channel structure and a construction method, and can solve the problem that the large height difference of a tunnel between a left line and a right line cannot be directly connected by a transverse channel.

Example two:

referring to fig. 5-8, the right shield tunnel 1 and the left shield tunnel 2 in this embodiment have a small left-right distance and a large height difference, i.e. when H > (S-D-4) x tan30 ° and S < D +2 x P + B, then the side vertical channel 6 is adopted, and the net distance between the vertical channel 6 and the shield tunnel is about 1.5D; meanwhile, the tunnel in the overlapped region is buried deeply or does not have open cut conditions, the contact channel is constructed by adopting a subsurface excavation method, and the construction steps are as follows:

step one, completing construction of a right shield tunnel 1 by adopting a shield machine;

step two, adopting a shield machine to complete the construction of the left shield tunnel 2;

thirdly, grouting and reinforcing the stratum within the range of 3m outside the excavation outline of the communication channel system by using an in-tunnel curtain, wherein the grout adopts cement-water glass double grout;

fourthly, opening the right shield tunnel 1 and excavating a right shield tunnel transverse channel 2;

fifthly, completing excavation of the transverse channel 2 of the right shield tunnel, and completing primary support and secondary lining;

taking the transverse channel 2 of the right shield tunnel as a working surface, finishing arch buckling and excavating of the vertical channel 6, and finishing primary support and secondary lining;

seventhly, completing excavation of the vertical channel 6, and completing primary support and secondary lining;

eighthly, completing the opening of the left shield tunnel 3 and excavating a transverse channel 4 of the right shield tunnel;

step nine, completing excavation of the transverse channel 4 of the left shield tunnel, and completing primary support and secondary lining;

and step ten, completing the installation of the fireproof door 10 and the stair handrail in the communication channel system.

Example three:

referring to fig. 5-8, in the embodiment, the right shield tunnel 1 and the left shield tunnel 2 have a small left-right distance and a large vertical height difference, that is, when H > (S-D-4) x tan30 °, and S < D +2 x P + B, and the tunnel in the overlapped area has a shallow buried depth, the construction is performed by using a light and dark excavation combination method, and the construction method is composed of an open-excavated vertical channel and a closed-excavated horizontal channel, and the construction steps are as follows:

firstly, carrying out building envelope construction on a vertical channel 6;

step two, excavating the earthwork of the vertical channel 6;

thirdly, constructing a vertical channel 6 structure;

step four, earthing and backfilling the vertical channel 6 to finish ground restoration;

fifthly, completing construction of the right shield tunnel 1 by adopting a shield machine;

sixthly, completing construction of the left shield tunnel 2 by adopting a shield machine;

seventhly, grouting and reinforcing the stratum within the range of 3m outside the excavation outline of the communication channel system by using an in-tunnel curtain, wherein the grout adopts cement-water glass double grout;

eighthly, completing the opening of the right shield tunnel 1 and excavating a transverse channel 2 of the right shield tunnel;

step nine, completing excavation of the transverse channel 2 of the right shield tunnel, completing primary support and secondary lining, and communicating with the open-cut vertical channel;

step ten, completing the opening of the left shield tunnel 3 and excavating the transverse channel 4 of the right shield tunnel;

eleven, completing excavation of a transverse channel 4 of the left shield tunnel, completing primary support and secondary lining, and communicating with an open-cut vertical channel;

and step twelve, finishing the installation of the fireproof door and the stair handrail in the communication channel system.

Example four:

referring to fig. 12 and 13, in the present embodiment, the right shield tunnel 1 and the left shield tunnel 3 have a smaller left-right distance and a larger up-down height difference, i.e. when H > (S-D-4) × tan30 ° and S < D +2 × P + B, the lateral longitudinal channels 5 can be arranged along the tunnel direction, and the construction procedure is the same as that of the first embodiment.

It will be appreciated by those skilled in the art that modifications and equivalents may be made to the embodiments described above, and that various modifications, equivalents, improvements and the like may be made without departing from the spirit and scope of the invention.