New Austrian split type mobile unit suitable for long step excavation and construction method

Abstract

The invention belongs to the technical field of tunnel construction equipment, and particularly relates to a novel Austrian-method split type mobile unit suitable for long step excavation and a construction method. The new Austrian split type mobile unit suitable for long step excavation comprises a front unit body arranged on an upper step and a rear unit body arranged on a rear step. The front unit comprises a front rack assembly, a main tunneling arm assembly is mounted on the front side of the front rack assembly, auxiliary slagging-off arm assemblies and front slagging-off mechanisms are mounted on the left side and the right side of the front rack assembly respectively, and an arch anchor arm assembly, a guniting arm assembly, an arch center transfer mechanism and an arch center transfer arm assembly are mounted at the top of the front rack assembly. The rear unit comprises a rear rack assembly, the front side of the rear rack assembly is provided with a front approach bridge mechanism used for being in lap joint with the front unit, and the rear rack assembly is further provided with a lower tunneling arm, a lower guniting arm, a rear deslagging mechanism, a jumbolter and a hoisting arch frame arm. The invention provides a novel Austrian-method split type mobile unit suitable for long step excavation and a construction method.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel construction equipment, and in particular relates to a new Austrian tunneling method split mobile unit suitable for long-step excavation and a construction method. Background Art

[0002] In the construction of the New Austrian Tunneling Method, the first process of the tunnel construction cycle is excavation, slag removal and initial support operations. Among them, there is no mature integration of tunnel construction equipment on the market that only operates in the first process of closed loops. In the construction tunnels with medium spans, some surrounding rocks are relatively intact, and the long step method (step length greater than 5 times the tunnel diameter) can be considered for tunnel construction with general faults. At present, due to the long steps of step-by-step excavation, the arch excavation process cannot keep up, and the lower construction affects the upper construction excavation. Summary of the invention

[0003] In order to solve the above-mentioned problems existing in the prior art, the purpose of the present invention is to provide a new Austrian Tunneling Maturation Tunneling split mobile unit and construction method suitable for long-step excavation, which does not affect vehicle passages, safety passages, maintenance passages, etc. during excavation, slag discharge and initial support operations.

[0004] The technical solution adopted by the present invention is:

[0005] A new Austrian Tunneling Mold split mobile unit suitable for long-step excavation, including a front unit arranged on an upper step and a rear unit arranged on a rear step; the front unit includes a front frame assembly, a main tunneling arm assembly is installed on the front side of the front frame assembly, auxiliary slag scraping arm assemblies and front slag discharge mechanisms are respectively installed on the left and right sides of the front frame assembly, and an arch anchor arm assembly, a shotcrete arm assembly, an arch frame transfer mechanism and an arch frame transfer arm assembly are installed on the top of the front frame assembly; the rear unit includes a rear frame assembly, a front approach bridge mechanism is installed on the front side of the rear frame assembly, the front unit and the rear unit are overlapped by the front approach bridge mechanism, and a lower tunneling arm, a lower shotcrete arm, a rear slag discharge mechanism, an anchor drill and a hoisting arch frame arm are also installed on the rear frame assembly.

[0006] The mobile unit of the present invention is a construction equipment for the long step method in medium-span tunnels with good surrounding rock conditions. Through the different excavation, parallel slag discharge and initial support equipment modules of the front and rear steps, the process of timely looping on the face is completed, thereby improving the utilization rate of personnel and equipment. The present invention cooperates with the construction cycle by ensuring the driving channel, personnel safety channel, material channel and equipment maintenance channel. The split equipment can avoid the mutual influence of construction between the upper and lower steps, enhance the interconnection of the construction process, increase the rational distribution of the processes while operating in parallel, and connect the processes to complete the long step excavation method and the process connection of the New Austrian Tunneling Method support.

[0007] As a preferred embodiment of the present invention, the front frame assembly includes a front frame mechanism, a front single-layer sliding mechanism is arranged on the front side of the front frame mechanism, the main tunneling arm assembly is installed on the front single-layer sliding mechanism, the auxiliary slag scraping arm and the front slag discharge mechanism are installed on the gantries on both sides of the front frame mechanism, and the arch anchor arm assembly, the shotcrete arm assembly, the arch frame transfer mechanism and the arch frame transfer arm assembly are installed on the top of the front frame mechanism.

[0008] The bottom of the front frame mechanism is also equipped with a stepping walking mechanism and a telescopic leg mechanism. The front frame mechanism is also equipped with an electrical system, a hydraulic system, a compressed air system, a water circulation system, a lubrication system and a dust removal and ventilation system.

[0009] Various positions of the front frame assembly are respectively connected to the main tunneling arm assembly, the slag removal arm assembly, the shotcrete arm assembly, the arch anchor arm assembly, the arch frame transfer mechanism, and the arch frame transfer arm assembly to ensure that each assembly can work in coordination.

[0010] As a preferred embodiment of the present invention, the rear frame assembly includes a rear frame mechanism, which is provided with sliding mechanisms on both the front and rear sides, the front approach bridge mechanism is installed on the front side of the rear frame mechanism, the lower road excavation arm assembly is installed on the sliding mechanism on the front side of the rear frame mechanism, and the lower road excavation arm, the lower road shotcrete arm, the rear slag discharge mechanism, the anchor drilling rig and the lifting arch frame arm are respectively installed on the rear frame mechanism.

[0011] The rear frame mechanism is also equipped with an electrical system, a hydraulic system, a compressed air system, a water circulation system, a lubrication system and a dust removal and ventilation system.

[0012] As a preferred solution of the present invention, the front approach bridge mechanism includes an approach bridge body, one end of which is mounted on the rear frame assembly, and an oil cylinder is connected between the middle section of the approach bridge body and the rear frame assembly.

[0013] As a preferred solution of the present invention, the lower tunneling arm includes a slewing support, which is fixed to the rear frame assembly, a slewing turntable is installed on the slewing support, a folding arm frame is connected to the output end of the slewing turntable, and the other end of the folding arm frame is connected to the tunneling tool. The lower tunneling arm also includes an execution control element such as a cylinder, a valve group, and a sensor for controlling the tunneling tool.

[0014] As a preferred embodiment of the present invention, the second-stage front slag discharge mechanism includes a box-type chute, which is installed on the side of the rear frame assembly. A chain scraper group, a power mechanism, a tensioning mechanism and a shovel mechanism are installed on the box-type chute. The output end of the power mechanism is connected to the rotating shaft of the chain scraper group, the tensioning mechanism is used to tension the chain scraper group, and the shovel mechanism is installed on the chain scraper group.

[0015] As a preferred embodiment of the present invention, the lower spraying arm includes a sliding trolley, which is mounted on the rear frame assembly, and a rotary turntable is mounted on the sliding trolley, and a spraying telescopic mechanism is connected to the output end of the rotary turntable, and a spray head is connected to the output end of the spraying telescopic mechanism. The lower spraying arm also includes an oil cylinder, a valve group, a sensor and other execution control elements.

[0016] As a preferred solution of the present invention, the anchor drilling machine includes a rotary table, which is installed on the rear frame assembly, and a dovetail anchor drilling machine is installed on the rotary table. The anchor drilling machine also includes cylinders, valve groups, sensors and other execution control elements.

[0017] As a preferred solution of the present invention, the hoisting arch arm includes an arm turntable, which is installed on the rear frame assembly, a telescopic arm is installed on the arm turntable, and a winch hoisting system is installed at the other end of the telescopic arm. The hoisting arch arm also includes cylinders, valve groups, sensors and other execution control elements.

[0018] A long step excavation construction method comprises the following steps:

[0019] S1: The excavation and slag removal operations of the front unit are completed by the cooperation of the main excavation arm assembly and the slag removal arm. The slag removal operation is carried out through the front slag removal mechanism to complete the tunnel excavation operation;

[0020] The initial spraying of the tunnel is completed by the shotcrete arm assembly, and the arch anchor arm assembly and the arch spray arm assembly are used to coordinate the erection operation;

[0021] The supporting materials are transported to the working surface by the arch frame transfer mechanism and the middle driving channel. After the erection is completed, the anchor drilling rig of the arch anchor arm is used to carry out the operations of leading, system and locking foot anchors, and then the spraying arm assembly is cooperated to complete the re-spraying to complete the initial support of the upper road;

[0022] S2: While the front unit is working, the rear unit is excavating at the same time, turning the slag to the backfill surface of the previous cycle, and the excess slag is transferred to the slag truck by the excavator;

[0023] After the excavation is completed, the bottom of the arch is cleaned, and after that, the first initial spraying operation is carried out by the lower shotcrete arm;

[0024] The arch frame is erected in time by the hoisting arch frame arm;

[0025] After the erection work is completed, the anchor work is carried out by the anchor drilling rig;

[0026] After the process is completed, the next shotcrete arm is used for re-spraying to complete the operation cycle;

[0027] S3: The front unit and the rear unit are connected by a front approach bridge mechanism, and the movement mode is step-by-step movement.

[0028] The beneficial effects of the present invention are:

[0029] The mobile unit of the present invention is a construction equipment for the long step method in medium-span tunnels with good surrounding rock conditions. Through the different excavation, parallel slag discharge and initial support equipment modules of the front and rear steps, the process of timely looping on the face is completed, thereby improving the utilization rate of personnel and equipment. The present invention cooperates with the construction cycle by ensuring the driving channel, personnel safety channel, material channel and equipment maintenance channel. The split equipment can avoid the mutual influence of construction between the upper and lower steps, enhance the interconnection of the construction process, increase the rational distribution of the processes while operating in parallel, and connect the processes to complete the long step excavation method and the process connection of the New Austrian Tunneling Method support. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is the main view of the front unit;

[0031] Figure 2 This is a top view of the front unit;

[0032] Figure 3 This is the left side view of the rear unit;

[0033] Figure 4 It is a construction flow chart of the present invention;

[0034] Figure 5 It is a construction simulation diagram of the present invention.

[0035] In the figure: 1-front unit; 2-rear unit; 11-front frame assembly; 12-main tunneling arm assembly; 13-auxiliary slag removal arm assembly; 14-front slag discharge mechanism; 15-arch anchor arm assembly; 16-grouting arm assembly; 17-arch frame transfer mechanism; 18-arch frame transfer arm assembly; 19-slurry storage system; 110-pumping system; 21-rear frame assembly; 22-front approach bridge mechanism; 23-lower tunneling arm; 24-lower grouting arm; 25-rear slag discharge mechanism; 26-anchor drilling rig; 27-hoisting arch frame arm. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0038] like Figure 1 to Figure 3 As shown, the new Austrian Tunneling Maturation Tunneling Split Mobile Unit adapted to long-step excavation of this embodiment comprises a front unit 1 arranged on the upper step and a rear unit 2 arranged on the rear step; the front unit 1 comprises a front frame assembly 11, a main excavation arm assembly 12 is installed on the front side of the front frame assembly 11, an auxiliary slag scraping arm assembly 13 and a front slag discharge mechanism 14 are respectively installed on the left and right sides of the front frame assembly 11, an arch anchor arm assembly 15, a shotcrete arm assembly 16, an arch frame transfer mechanism 17 and an arch frame transfer arm assembly 18 are installed on the top of the front frame assembly 11; the rear unit 2 comprises a rear frame assembly 21, a front approach bridge mechanism 22 is installed on the front side of the rear frame assembly 21, the front unit 1 and the rear unit 2 are overlapped by the front approach bridge mechanism 22, and a lower tunneling arm 23, a lower shotcrete arm 24, a rear slag discharge mechanism 25, an anchor drilling rig 26 and a hoisting arch frame arm 27 are also installed on the rear frame assembly 21.

[0039] The mobile unit of the present invention is a construction equipment for the long step method in medium-span tunnels with good surrounding rock conditions. Through the different excavation, parallel slag discharge and initial support equipment modules of the front and rear steps, the process of timely looping on the face is completed, thereby improving the utilization rate of personnel and equipment. The present invention cooperates with the construction cycle by ensuring the driving channel, personnel safety channel, material channel and equipment maintenance channel. The split equipment can avoid the mutual influence of construction between the upper and lower steps, enhance the interconnection of the construction process, increase the rational distribution of the processes while operating in parallel, and connect the processes to complete the long step excavation method and the process connection of the New Austrian Tunneling Method support.

[0040] Specifically, Figure 1 and Figure 2 As shown, the front frame assembly 11 includes a front frame mechanism, a front single-layer sliding mechanism is arranged on the front side of the front frame mechanism, the main excavation arm assembly 12 is installed on the front single-layer sliding mechanism, the auxiliary slag scraper arm and the front slag discharge mechanism 14 are installed on the two side portals of the front frame mechanism, and the arch anchor arm assembly 15, the shotcrete arm assembly 16, the arch frame transfer mechanism 17 and the arch frame transfer arm assembly 18 are installed on the top of the front frame mechanism.

[0041] The bottom of the front frame mechanism is also equipped with a step-by-step walking mechanism and a telescopic leg mechanism. The front frame mechanism is also equipped with an electrical system, a hydraulic system, a compressed air system, a water circulation system, a lubrication system, and a dust removal and ventilation system. The electrical system consists of a control circuit, a power circuit, a lighting circuit, and an emergency circuit. The hydraulic system is distributed in all the original mechanisms that need to perform actions. The lubrication system consists of a lubrication plunger pump group, a pipeline system, a heating system, etc. The ventilation system consists of a fan and air duct. The water circulation system consists of a booster pump and a water circulation pipeline.

[0042] Each position of the front frame assembly 11 is respectively connected to the main excavation arm assembly 12, the slag removal arm assembly, the grouting arm assembly 16, the arch anchor arm assembly 15, the arch frame transfer mechanism 17, and the arch frame transfer arm assembly 18 to ensure that each assembly can work in coordination.

[0043] The main excavation arm assembly 12 includes an arm turntable, which is installed on the output end of the front single-layer sliding mechanism of the front frame mechanism, and the output end of the arm turntable is connected to a folding arm, and the other end of the folding arm is installed with an excavation tool. The main excavation arm assembly 12 also includes an oil cylinder, a valve group, a sensor and other execution control elements for controlling the excavation tool, and the excavation tool is a breaker hammer, etc.

[0044] The auxiliary slag scraper arm assembly 13 includes an arm turntable, which is installed on the front frame assembly 11. The output end of the arm turntable is connected to a folding arm, and the other end of the folding arm is connected to a digging and scraping integrated tooling, which is located next to the main tunneling arm assembly 12. The auxiliary slag scraper arm assembly 13 also includes cylinders, valve groups, sensors and other execution control elements for controlling the digging and scraping integrated tooling. The digging and scraping integrated tooling is a breaker hammer and a slag scraper bucket. The breaker hammer is used for crushing, and the slag scraper bucket is used to scrape off the crushed slag. The auxiliary slag scraper arm assembly 13 is divided into two groups, which are arranged on the left and right sides of the main tunneling arm assembly 12.

[0045] The arch-anchor arm assembly 15 includes a sliding mechanism, which is installed on the top of the front frame assembly 11. The output end of the sliding mechanism is connected to the arm turntable, and the output end of the arm turntable is connected to the telescopic arm. The output ends of the telescopic arm are respectively installed with an operating basket, an anchor drilling rig and an arch grabber. The staff can stand on the operating basket to work, the anchor drilling rig is used for anchor operations, and the arch grabber is used to grab the arch when installing the arch. The arch-anchor arm assembly 15 also includes cylinders, valve groups, sensors and other execution control elements for controlling the actions of each structure. The arch-anchor arm assembly 15 consists of two groups, which are arranged symmetrically on the top of the front frame structure.

[0046] The shotcrete arm assembly 16 includes a sliding mechanism, which is installed on the top of the front frame assembly 11. The output end of the sliding mechanism is connected to the arm turntable, and the output end of the arm turntable is connected to the telescopic arm. The output end of the telescopic arm is respectively installed with an arch transfer auxiliary arm, a flip folding arm, a shotcrete operation head and an arch grabber. The shotcrete operation head is connected to a pumping system 110 through a pipeline, and the pumping system 110 is connected to a slurry storage system 19. When the excavation is completed, the shotcrete operation is performed through the shotcrete operation head; the arch grabber is used to grab the arch. The shotcrete arm assembly 16 also includes execution control elements such as oil cylinders, valve groups, sensors, etc. for controlling the actions of each structure.

[0047] The front slag discharge mechanism 14 includes a box-type chute, which is installed on the side of the front frame assembly 11. The box-type chute is equipped with a chain scraper group, a power mechanism, a tensioning mechanism and a shovel mechanism. The output end of the power mechanism is connected to the rotating shaft of the chain scraper group. The tensioning mechanism is used to tension the chain scraper group. The shovel mechanism is installed on the chain scraper group. The front slag discharge mechanism 14 collects the slag and transfers it to the telescopic conveyor belt, which then delivers it out.

[0048] Specifically, Figure 3 As shown, the rear frame assembly 21 includes a rear frame mechanism, and the rear frame mechanism is provided with sliding mechanisms on both the front and rear sides. The front approach bridge mechanism 22 is installed on the front side of the rear frame mechanism, and the lower road excavation arm 23 assembly is installed on the sliding mechanism on the front side of the rear frame mechanism. The lower road excavation arm 23, the lower road shotcrete arm 24, the rear slag discharge mechanism 25, the anchor drill rig 26 and the hoisting arch arm 27 are respectively installed on the rear frame mechanism.

[0049] The bottom of the rear frame mechanism is also equipped with a step-by-step walking mechanism and a telescopic leg mechanism. The rear frame mechanism is also equipped with an electrical system, a hydraulic system, a compressed air system, a water circulation system, a lubrication system, and a dust removal and ventilation system. The electrical system consists of a control circuit, a power circuit, a lighting circuit, and an emergency circuit. The hydraulic system is distributed in all the original mechanisms that need to perform actions. The lubrication system consists of a lubrication plunger pump group, a pipeline system, a heating system, etc. The dust removal and ventilation system consists of a fan and air duct. The water circulation system consists of a booster pump and a water circulation pipeline.

[0050] The front bridge approach mechanism 22 includes a bridge approach body, one end of which is mounted on the rear frame assembly 21 , and an oil cylinder is connected between the middle section of the bridge approach body and the rear frame assembly 21 .

[0051] The lower tunneling arm 23 includes a slewing support, which is fixed to the rear frame assembly 21. A slewing turntable is installed on the slewing support. The output end of the slewing turntable is connected to a folding arm frame, and the other end of the folding arm frame is connected to a tunneling tool. The lower tunneling arm 23 also includes an oil cylinder, a valve group, a sensor and other execution control elements for controlling the tunneling tool. The tunneling tool is a breaker hammer, etc.

[0052] The second-stage front slag discharge mechanism 14 includes a box-type chute, which is installed on the side of the rear frame assembly 21. A chain scraper group, a power mechanism, a tensioning mechanism and a shovel mechanism are installed on the box-type chute. The output end of the power mechanism is connected to the rotating shaft of the chain scraper group. The tensioning mechanism is used to tension the chain scraper group, and the shovel mechanism is installed on the chain scraper group.

[0053] The lower spraying arm 24 includes a sliding trolley, which is mounted on the rear frame assembly 21. A rotary table is mounted on the sliding trolley, and a spraying telescopic mechanism is connected to the output end of the rotary table, and a spray head is connected to the output end of the spraying telescopic mechanism. The lower spraying arm 24 also includes execution control elements such as a cylinder, a valve group, and a sensor.

[0054] The anchor drill 26 includes a rotary table, which is mounted on the rear frame assembly 21, and a dovetail anchor drill is mounted on the rotary table. The anchor drill 26 also includes execution control elements such as a cylinder, a valve group, and a sensor.

[0055] The hoisting arch arm 27 includes an arm turntable, which is installed on the rear frame assembly 21. A telescopic arm is installed on the arm turntable, and a winch hoisting system is installed at the other end of the telescopic arm. The hoisting arch arm 27 also includes execution control elements such as oil cylinders, valve groups, and sensors.

[0056] like Figure 4 and Figure 5 As shown, the long step excavation construction method of this embodiment includes the following steps:

[0057] S1: The excavation and slag removal operation of the front unit 1 is completed by the cooperation of the main excavation arm assembly 12 and the slag removal arm, and the slag removal operation is completed by the front slag removal mechanism 14 to complete the tunnel excavation operation;

[0058] The initial spraying operation of the tunnel is completed by the spraying arm assembly 16, and the arch anchor arm assembly 15 and the arch spraying arm assembly cooperate with the erection operation;

[0059] The supporting materials are transported to the working surface by the arch frame transport mechanism 17 and the middle driving channel. After the erection is completed, the anchor drilling machine of the arch anchor arm performs the operations of leading, system and locking foot anchors, and then cooperates with the shotcrete arm assembly 16 to complete the re-spraying to complete the initial support of the upper road;

[0060] S2: While the unit 1 is working before going up the track, the unit 2 is excavating after going down the track, turning the slag to the backfill surface of the previous cycle, and the excess slag is transferred to the slag truck by the excavator;

[0061] After the excavation is completed, the bottom of the arch is cleaned, and after that, the first initial spraying operation is carried out by the lower spraying arm 24;

[0062] And the arch frame is erected in time by the hoisting arch frame arm 27;

[0063] After the erection operation is completed, the anchor operation is performed by the anchor drilling machine 26;

[0064] After the process is completed, the next shotcrete arm 24 is used for re-spraying to complete the operation cycle;

[0065] S3: The front unit 1 and the rear unit 2 are overlapped by the front approach bridge mechanism 22, and the movement mode is step-by-step movement.

[0066] The present invention is not limited to the above-mentioned optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope defined by the claims of the present invention fall within the protection scope of the present invention.

Claims

1. A new Austrian Tunneling Mold split mobile unit suitable for long-step excavation, characterized by: The invention comprises a front unit (1) arranged on an upper step and a rear unit (2) arranged on a rear step; the front unit (1) comprises a front frame assembly (11), a main excavation arm assembly (12) is installed on the front side of the front frame assembly (11), an auxiliary slag removal arm assembly (13) and a front slag discharge mechanism (14) are installed on the left and right sides of the front frame assembly (11), an arch anchor arm assembly (15), a grouting arm assembly (16), an arch frame transfer arm assembly (17) and a grouting arm assembly (18) are installed on the top of the front frame assembly (11). The rear unit (2) comprises a rear frame assembly (21), a front approach bridge mechanism (22) is installed on the front side of the rear frame assembly (21), the front unit (1) and the rear unit (2) are overlapped by the front approach bridge mechanism (22), and the rear frame assembly (21) is also equipped with a lower tunneling arm (23), a lower grouting arm (24), a rear slag discharge mechanism (25), an anchor drilling machine (26) and a hoisting arch frame arm (27).

2. According to claim 1, a New Austrian Tunneling Mold Split Mobile Unit suitable for long-step excavation is characterized by: The front frame assembly (11) comprises a front frame mechanism, a front single-layer sliding mechanism is arranged at the front side of the front frame mechanism, a main excavation arm assembly (12) is mounted on the front single-layer sliding mechanism, an auxiliary slag scraping arm and a front slag discharging mechanism (14) are mounted on the door frames on both sides of the front frame mechanism, and an arch anchor arm assembly (15), a grouting arm assembly (16), an arch frame transfer mechanism (17) and an arch frame transfer arm assembly (18) are mounted on the top of the front frame mechanism.

3. According to claim 1, a New Austrian Tunneling Mold Split Mobile Unit suitable for long-step excavation is characterized by: The rear frame assembly (21) comprises a rear frame mechanism, on which sliding mechanisms are arranged on both the front and rear sides, a front approach bridge mechanism (22) is installed on the front side of the rear frame mechanism, a lower tunneling arm (23) assembly is installed on the sliding mechanism on the front side of the rear frame mechanism, and a lower tunneling arm (23), a lower shotcrete arm (24), a rear slag discharge mechanism (25), an anchor drill (26) and a hoisting arch arm (27) are respectively installed on the rear frame mechanism.

4. According to claim 1, a New Austrian Tunneling Mold Split Mobile Unit suitable for long-step excavation is characterized by: The front approach bridge mechanism (22) comprises an approach bridge body, one end of which is mounted on a rear frame assembly (21), and an oil cylinder is connected between the middle section of the approach bridge body and the rear frame assembly (21).

5. According to claim 1, a New Austrian Tunneling Mold Split Mobile Unit suitable for long-step excavation is characterized by: The lower tunneling arm (23) comprises a slewing support, which is fixed on the rear frame assembly (21). A slewing turntable is installed on the slewing support. The output end of the slewing turntable is connected to a folding arm frame, and the other end of the folding arm frame is connected to a tunneling tool.

6. The NATM split mobile unit suitable for long-step excavation according to claim 1 is characterized in that: The second-stage front slag discharge mechanism (14) comprises a box-type chute, which is installed on the side of the rear frame assembly (21). A chain scraper group, a power mechanism, a tensioning mechanism and a shovel mechanism are installed on the box-type chute. The output end of the power mechanism is connected to the rotating shaft of the chain scraper group. The tensioning mechanism is used to tension the chain scraper group. The shovel mechanism is installed on the chain scraper group.

7. The NATM split mobile unit suitable for long step excavation according to claim 1 is characterized by: The lower spraying arm (24) comprises a sliding trolley, which is mounted on the rear frame assembly (21). A rotary table is mounted on the sliding trolley, and the output end of the rotary table is connected to a spraying telescopic mechanism, and the output end of the spraying telescopic mechanism is connected to a spray head.

8. The NATM split mobile unit suitable for long step excavation according to claim 1 is characterized by: The anchor drilling machine (26) comprises a rotary turntable which is mounted on a rear frame assembly (21) and a dovetail anchor drilling machine is mounted on the rotary turntable.

9. The NATM split mobile unit suitable for long-step excavation according to claim 1 is characterized by: The hoisting arch arm (27) comprises an arm turntable, which is mounted on the rear frame assembly (21). A telescopic arm is mounted on the arm turntable, and a winch hoisting system is mounted on the other end of the telescopic arm.

10. A long step excavation construction method, using a New Austrian Tunneling Mold Split Mobile Unit suitable for long step excavation as claimed in claim 1, characterized in that: The following steps are involved: S1: The front unit (1) performs the tunnel excavation and slag removal operations in cooperation with the main excavation arm assembly (12) and the slag removal arm, and the slag removal operation is completed through the front slag removal mechanism (14), thereby completing the tunnel excavation operation; The initial tunnel spraying operation is completed by the spraying arm assembly (16), and the arch anchor arm assembly (15) and the arch spraying arm assembly cooperate with the frame erection operation; The supporting materials are transported to the working surface by the arch frame transport mechanism (17) and the middle driving channel. After the erection is completed, the anchor drilling machine of the arch anchor arm performs the operations of leading, system and locking foot anchor bolts, and then cooperates with the shotcrete arm assembly (16) to complete the re-spraying to complete the initial support of the upper road; S2: While the upper track front unit (1) is operating, the lower track rear unit (2) is excavating synchronously, turning the slag onto the backfill surface of the previous cycle, and the excess slag is transferred to the slag truck by the excavator; After the excavation is completed, the bottom of the arch is cleaned, and after completion, the first initial spraying operation is carried out by the lower spraying arm (24); The arch frame is erected in time by the hoisting arch frame arm (27); After the erection operation is completed, the anchor operation is performed by using an anchor drilling machine (26); After the process is completed, the next shotcrete arm (24) performs re-spraying to complete the operation cycle; S3: The front unit (1) and the rear unit (2) are overlapped by the front approach bridge mechanism (22), and the movement mode is step-by-step movement.

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