New Austrian method integrated mobile unit suitable for short step excavation and construction method

Abstract

The invention belongs to the technical field of tunnel construction equipment, and particularly relates to a new Austrian integrated mobile unit suitable for short step excavation and a construction method. According to the technical scheme, the novel Austrian integrated moving unit suitable for short step excavation comprises a main rack structure, a main tunneling arm assembly is installed on the front side of the main rack structure, a rear tunneling arm assembly is installed on the rear side of the main rack structure, and auxiliary slagging-off arm assemblies and slagging-off scrapers are installed on the left side and the right side of the main rack structure correspondingly; an arch anchor arm assembly and a middle arch spraying arm assembly are installed on the top of the main rack structure, a telescopic conveying belt is arranged on the main rack structure and close to the deslagging scraper, and the middle arch spraying arm assembly is connected with a movable guniting tool. The invention provides a new Austrian method integrated mobile unit suitable for short bench excavation and a construction method. The problems that during short bench method excavation, mechanical equipment of all functional blocks in front excavation and primary supporting procedures of a front tunnel face is difficult to connect, and parallel construction cannot be achieved are solved.

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 integrated mobile unit suitable for short-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 primary support operations. In the construction of medium-span tunnels, some surrounding rocks are relatively intact, and the short step method (1 to 1.5 times the tunnel diameter step length) can be considered for tunnel construction with general faults.

[0003] At present, there is no mature integrated tunnel construction equipment in the industry that is only for closed loop front process operations. In the existing short bench excavation equipment, the various functional block mechanical equipment for the front excavation and primary support process of the front face are difficult to connect and cannot be constructed in parallel. Summary of the invention

[0004] 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 Method integrated mobile unit and construction method suitable for short-step excavation, so as to solve the difficulties in connecting the mechanical equipment of various functional blocks in the front excavation and initial support process of the front face during short-step excavation and the inability to carry out parallel construction, and complete the initial support and ring forming process of the new Austrian Tunneling Method construction through mechanized and integrated stand-integrated equipment.

[0005] The technical solution adopted by the present invention is:

[0006] A new Austrian tunneling method integrated mobile unit suitable for short-step excavation, including a main frame structure, a main tunneling arm assembly is installed on the front side of the main frame structure, a rear tunneling arm assembly is installed on the rear side of the main frame structure, auxiliary slag scraper arm assemblies and slag scrapers are installed on the left and right sides of the main frame structure respectively, an arch anchor arm assembly and an intermediate arch spray arm assembly are installed on the top of the main frame structure, a telescopic conveyor belt is arranged on the main frame structure near the slag scraper, an arch frame transfer mechanism is also installed on the main frame structure, and a mobile spraying tooling is connected to the intermediate arch spray arm assembly.

[0007] The present invention solves the problem of connecting the construction procedures of the short-step method under general circumstances of surrounding rock of medium-span tunnels by reasonably arranging the main tunneling arm assembly, the rear tunneling arm assembly, the auxiliary slag removal arm assembly, the slag scraper, the arch anchor arm assembly, the intermediate arch spray arm assembly and other structures on the main frame structure, thereby ensuring safe step distance and timely looping, increasing excavation efficiency and safety, improving the labor intensity of workers, and improving construction safety.

[0008] The reasonable arrangement of the assemblies of the present invention can realize parallel construction and cyclic operation of two integrated mobile units of the new Austrian Tunneling Method, further improving efficiency. The present invention integrates mechanized construction equipment to complete the process requirements of the tunnel during construction and realizes the combination of the new Austrian Tunneling Method support method and the step method mechanical excavation.

[0009] As a preferred embodiment of the present invention, the main platform structure includes a frame mechanism, and the front and rear sides of the frame mechanism are connected to single-layer sliding mechanisms. The main excavation arm assembly is installed on the single-layer sliding mechanism on the front side of the frame mechanism, and the rear excavation arm assembly is installed on the single-layer sliding mechanism on the rear side of the frame mechanism; gantries are provided on the left and right sides of the frame mechanism, and the auxiliary slag scraper arm assembly and the slag scraper are installed on the gantries; the arch anchor arm assembly and the intermediate arch spray arm assembly are installed on the top of the frame mechanism, and the arch frame transfer mechanism is installed on the frame mechanism.

[0010] The bottom of the frame mechanism is also equipped with a stepping walking mechanism and a telescopic leg mechanism. The 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.

[0011] Each position of the main frame structure is respectively connected to the main tunneling arm assembly, the rear tunneling arm assembly, the auxiliary slag removal arm assembly, the slag scraper, the arch anchor arm assembly, the intermediate arch spray arm assembly and the arch frame transfer mechanism to ensure that each assembly can work in coordination.

[0012] As a preferred solution of the present invention, the main tunneling arm assembly includes a boom turntable, which is installed on the output end of the single-layer sliding mechanism on the front side of the frame mechanism, and the output end of the boom turntable is connected to a folding boom, and the other end of the folding boom is installed with a tunneling tool. The main tunneling arm assembly also includes cylinders, valve groups, sensors and other execution control elements for controlling the tunneling tool, and the tunneling tool is a breaker hammer, etc.

[0013] As a preferred embodiment of the present invention, the auxiliary slag scraper arm assembly includes an arm frame turntable, which is installed on the main frame structure. The output end of the arm frame turntable is connected to a folding arm frame, and the other end of the folding arm frame is connected to a digging and scraping integrated tooling, which is located next to the main tunneling arm assembly. The auxiliary slag scraper arm assembly also includes cylinders, valve groups, sensors and other execution control elements for controlling the digging and scraping integrated tooling, and the digging and scraping integrated tooling is a breaker hammer and a slag scraper bucket. The auxiliary slag scraper arm assembly is divided into two groups, which are arranged on the left and right sides of the main tunneling arm assembly.

[0014] As a preferred embodiment of the present invention, the arch-anchor arm assembly includes a sliding mechanism, which is installed on the top of the main frame structure. 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 drill and an arch gripper. The arch-anchor arm assembly also includes cylinders, valve groups, sensors and other execution control elements for controlling the actions of each structure. The arch-anchor arm assembly is divided into two groups, which are arranged symmetrically on the top of the main frame structure.

[0015] As a preferred embodiment of the present invention, the intermediate arch spray arm assembly includes a sliding mechanism, which is installed on the top of the main frame structure, and 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, and the telescopic arm is connected to the arch frame transfer auxiliary arm and the flip folding arm, and the other end of the flip folding arm is installed with a spraying operation head, and the other end of the arch frame transfer auxiliary arm is installed with an arch frame gripper, and the spraying operation head is connected to the mobile spraying tooling through a pump pipe. The intermediate arch spray arm assembly also includes execution control elements such as oil cylinders, valve groups, sensors, etc. for controlling the actions of each structure.

[0016] As a preferred solution of the present invention, the slag scraper comprises a box chute, which is installed on the side of the main frame structure, and the other end of the box chute is arranged close to the telescopic conveyor belt. The box 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, and the shovel mechanism is installed on the chain scraper group. The slag scraper collects the slag and transfers it to the telescopic conveyor belt, which is then transferred to the slag truck behind the main frame structure.

[0017] As a preferred solution of the present invention, the rear excavation arm assembly includes an arm turntable, which is installed on the output end of the single-layer sliding mechanism on the rear side of the 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 connected to a digging and scraping integrated tooling. The rear excavation arm assembly also includes cylinders, valve groups, sensors and other execution control elements for controlling the action of the digging and scraping integrated tooling, and the digging and scraping integrated tooling is a breaker hammer and a scraping bucket.

[0018] As a preferred solution of the present invention, the mobile spraying tool comprises a pump group, the pump group is connected to a spraying pipeline, and the other end of the spraying pipeline is connected to the middle arch spraying arm assembly. The mobile spraying tool also includes an arch frame transfer mechanism.

[0019] A short step excavation construction method, comprising the following steps:

[0020] S1: The main excavation arm assembly performs excavation work at the front, and the auxiliary slag removal arm assemblies on the left and right sides perform auxiliary excavation and slag removal operations;

[0021] S2: The scraper conveyor transfers the slag to the telescopic conveyor belt, which transfers the slag to the slag truck behind the main frame structure;

[0022] S3: The auxiliary scraper arm assembly cooperates with the main excavation arm assembly to perform trimming, risk removal, arch footing, and complete the excavation work of the tunnel construction cycle;

[0023] S4: When the excavation is completed, the initial spraying operation is carried out by using the middle arch spray arm assembly in conjunction with the pump group of the mobile spraying tooling;

[0024] S5: After the initial spraying and curing is completed, anchor bolting is performed through the arch anchor arm assemblies on both sides;

[0025] S6: After the bolting operation is completed, re-spraying is carried out to complete the cycle operation of the initial support of the tunnel;

[0026] S7: When excavating the upper step, staggered excavation is performed on the lower step at the same time. When excavating the lower step, invert construction is performed. The slag turning operation is performed through the left-right staggered excavation method and the telescopic slag discharge platform; and the excavation cycle is completed.

[0027] The beneficial effects of the present invention are:

[0028] The present invention solves the problem of connecting the construction procedures of the short-step method under general circumstances of surrounding rock of medium-span tunnels by reasonably arranging the main tunneling arm assembly, the rear tunneling arm assembly, the auxiliary slag removal arm assembly, the slag scraper, the arch anchor arm assembly, the intermediate arch spray arm assembly and other structures on the main frame structure, thereby ensuring safe step distance and timely looping, increasing excavation efficiency and safety, improving the labor intensity of workers, and improving construction safety.

[0029] The reasonable arrangement of the assemblies of the present invention can realize parallel construction and cyclic operation of two integrated mobile units of the new Austrian Tunneling Method, further improving efficiency. The present invention integrates mechanized construction equipment to complete the process requirements of the tunnel during construction and realizes the combination of the new Austrian Tunneling Method support method and the step method mechanical excavation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a front view of the present invention;

[0031] Figure 2 is a top view of the present invention;

[0032] Figure 3 It is the full cross-section of the tunnel during excavation;

[0033] Figure 4 It is a construction process diagram of the present invention;

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

[0035] In the figure: 1-main frame structure; 2-main excavation arm assembly; 3-rear excavation arm assembly; 4-auxiliary slag removal arm assembly; 5-slag scraper; 6-arch anchor arm assembly; 7-middle arch spray arm assembly; 8-telescopic conveyor belt; 9-mobile spraying tooling. 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 and Figure 2 As shown, the new Austrian Tunneling Maturation integrated mobile unit suitable for short-step excavation in this embodiment includes a main frame structure 1, a main excavation arm assembly 2 is installed on the front side of the main frame structure 1, a rear excavation arm assembly 3 is installed on the rear side of the main frame structure 1, and auxiliary slag scraper arm assemblies 4 and slag scraper 5 are installed on the left and right sides of the main frame structure 1 respectively. An arch anchor arm assembly 6 and an intermediate arch spray arm assembly 7 are installed on the top of the main frame structure 1. A telescopic conveyor belt 8 is arranged on the main frame structure 1 near the slag scraper 5. An arch frame transfer mechanism is also installed on the main frame structure 1, and the intermediate arch spray arm assembly 7 is connected to a mobile spraying tooling 9.

[0039] The present invention solves the problem of connecting the construction procedures of the short-step method under general circumstances of surrounding rock of medium-span tunnels by reasonably arranging the main tunneling arm assembly 2, the rear tunneling arm assembly 3, the auxiliary slag removal arm assembly 4, the slag scraper 5, the arch anchor arm assembly 6, the intermediate arch spray arm assembly 7 and other structures on the main platform structure 1, thereby ensuring safe step distance and timely ring formation, increasing excavation efficiency and safety, improving the labor intensity of workers, and improving construction safety.

[0040] The reasonable arrangement of the assemblies of the present invention can realize parallel construction and cyclic operation of two integrated mobile units of the new Austrian Tunneling Method, further improving efficiency. The present invention integrates mechanized construction equipment to complete the process requirements of the tunnel during construction and realizes the combination of the new Austrian Tunneling Method support method and the step method mechanical excavation.

[0041] Specifically, the main platform structure 1 includes a frame mechanism, and the front and rear sides of the frame mechanism are connected to single-layer sliding mechanisms. The main excavation arm assembly 2 is installed on the single-layer sliding mechanism on the front side of the frame mechanism, and the rear excavation arm assembly 3 is installed on the single-layer sliding mechanism on the rear side of the frame mechanism; gantries are provided on the left and right sides of the frame mechanism, and the auxiliary slag arm assembly 4 and the slag scraper 5 are installed on the gantries; the arch anchor arm assembly 6 and the intermediate arch spray arm assembly 7 are installed on the top of the frame mechanism, and the arch frame transfer mechanism is installed on the frame mechanism.

[0042] The bottom of the frame mechanism is also equipped with a stepping walking mechanism and a telescopic leg mechanism. The 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.

[0043] The electrical system consists of control circuit, power circuit, lighting circuit and emergency circuit. The hydraulic system is distributed in all components and mechanisms that need to perform actions. The lubrication system consists of lubrication plunger pump group, pipeline system, heating system, etc. The ventilation system consists of fan and air duct. The water circulation system consists of booster pump and water circulation pipeline.

[0044] Each position of the main frame structure 1 is respectively connected to the main excavation arm assembly 2, the rear excavation arm assembly 3, the auxiliary slag removal arm assembly 4, the slag scraper 5, the arch anchor arm assembly 6, the middle arch spray arm assembly 7 and the arch frame transfer mechanism to ensure that each assembly can work in coordination.

[0045] Specifically, the main excavation arm assembly 2 includes an arm turntable, which is installed on the output end of the single-layer sliding mechanism on the front side of the 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 2 also includes cylinders, valve groups, sensors and other execution control elements for controlling the excavation tool, and the excavation tool is a breaker hammer, etc.

[0046] Specifically, the auxiliary slag scraper arm assembly 4 includes an arm turntable, which is installed on the frame mechanism. 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 excavation arm assembly 2. The auxiliary slag scraper arm assembly 4 also includes an oil cylinder, a valve group, a sensor 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 4 is divided into two groups, which are arranged on the left and right sides of the main excavation arm assembly 2.

[0047] Specifically, the arch anchor arm assembly 6 includes a sliding mechanism, which is installed on the top of the frame mechanism. The output end of the sliding mechanism is connected to the boom turntable, and the output end of the boom turntable is connected to the telescopic boom. The output ends of the telescopic boom are respectively installed with an operating basket, an anchor drilling rig and an arch frame grabber. The staff can stand on the operating basket to work, the anchor drilling rig is used for anchor operations, and the arch frame grabber is used to grab the arch frame when installing the arch frame. The arch anchor arm assembly 6 also includes cylinders, valve groups, sensors and other execution control elements for controlling the actions of each structure. The arch anchor arm assembly 6 consists of two groups, which are arranged symmetrically on the top of the main frame structure 1.

[0048] Specifically, the intermediate arch spray arm assembly 7 includes a sliding mechanism, which is installed on the top of the main frame structure 1. 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 telescopic arm is connected to the arch transport auxiliary arm and the flip folding arm. The other end of the flip folding arm is equipped with a spraying operation head, and the other end of the arch transport auxiliary arm is equipped with an arch gripper. The spraying operation head is connected to the mobile spraying tool 9 through a pump pipe. When the excavation is completed, the spraying operation is performed by the spraying operation head; the arch gripper is used to grab the arch. The intermediate arch spray arm assembly 7 also includes cylinders, valve groups, sensors and other execution control elements for controlling the actions of each structure.

[0049] Specifically, the slag scraper 5 includes a box chute, which is installed on the side of the main frame structure 1, and the other end of the box chute is arranged close to the telescopic conveyor belt 8. The box 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, and the shovel mechanism is installed on the chain scraper group. The slag scraper 5 collects the slag and transfers it to the telescopic conveyor belt 8, which is then transferred to the slag truck behind the main frame structure 1.

[0050] Specifically, the rear excavation arm assembly 3 includes an arm turntable, which is installed on the output end of the single-layer sliding mechanism on the rear side of the frame mechanism. 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. The rear excavation arm assembly 3 also includes an oil cylinder, a valve group, a sensor and other execution control elements for controlling the action of the digging and scraping integrated tooling. The digging and scraping integrated tooling is a breaker hammer and a scraping bucket, the breaker hammer is used for crushing, and the scraping bucket is used to scrape off the crushed debris.

[0051] Specifically, the mobile spraying tool 9 includes a pump group, the pump group is connected to a spraying pipeline, and the other end of the spraying pipeline is connected to the middle arch spray arm assembly 7. The mobile spraying tool 9 also includes an arch frame transfer mechanism.

[0052] like Figure 3 to Figure 5 As shown, the short step excavation construction method of this embodiment includes the following steps:

[0053] S1: The main excavation arm assembly 2 performs excavation work at the front side, and the auxiliary slag removal arm assemblies 4 on the left and right sides perform auxiliary excavation and slag removal operations;

[0054] S2: The slag scraper 5 transfers the slag to the telescopic conveyor belt 8, and the telescopic conveyor belt 8 transfers the slag to the slag truck behind the main frame structure 1, and then transfers the slag to the outside of the tunnel;

[0055] S3: The auxiliary scraper arm assembly 4 cooperates with the main excavation arm assembly 2 to perform trimming, risk removal, arch footing and other related work to complete the excavation operation of the tunnel construction cycle;

[0056] S4: When the excavation is completed, the middle arch spray arm assembly 7 cooperates with the pump group of the mobile spraying tooling 9 to perform the initial spraying operation;

[0057] S5: After the initial spraying and curing is completed, anchor bolting is performed through the arch anchor arm assemblies 6 on both sides;

[0058] S6: After the bolting operation is completed, re-spraying is carried out to complete the cycle operation of the initial support of the tunnel;

[0059] S7: When excavating the upper step, staggered excavation is performed on the lower step at the same time. When excavating the lower step, invert construction is performed. The slag turning operation is performed through the left-right staggered excavation method and the telescopic slag discharge platform; and the excavation cycle is completed.

[0060] 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 integrated mobile unit suitable for short step excavation, characterized by: The invention comprises a main frame structure (1), wherein a main excavation arm assembly (2) is installed on the front side of the main frame structure (1), a rear excavation arm assembly (3) is installed on the rear side of the main frame structure (1), an auxiliary slag removal arm assembly (4) and a slag removal scraper (5) are installed on the left and right sides of the main frame structure (1), an arch anchor arm assembly (6) and an intermediate arch spray arm assembly (7) are installed on the top of the main frame structure (1), a telescopic conveyor belt (8) is arranged on the main frame structure (1) near the slag removal scraper (5), and a mobile spraying tool (9) is connected to the intermediate arch spray arm assembly (7).

2. According to claim 1, a NATM integrated mobile unit suitable for short step excavation is characterized by: The main frame structure (1) comprises a frame mechanism, the front and rear sides of the frame mechanism are connected to single-layer sliding mechanisms, the main excavation arm assembly (2) is mounted on the single-layer sliding mechanism on the front side of the frame mechanism, and the rear excavation arm assembly (3) is mounted on the single-layer sliding mechanism on the rear side of the frame mechanism; the left and right sides of the frame mechanism are provided with portal frames, the auxiliary slag removal arm assembly (4) and the slag removal scraper (5) are both mounted on the portal frames; the arch anchor arm assembly (6) and the intermediate arch spray arm assembly (7) are mounted on the top of the frame mechanism, and the arch frame transfer mechanism is mounted on the frame mechanism.

3. The NATM integrated mobile unit suitable for short step excavation according to claim 2 is characterized in that: The main excavation arm assembly (2) comprises an arm turntable, which is installed on the output end of the single-layer sliding mechanism on the front side of the frame mechanism. 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.

4. According to claim 1, a NATM integrated mobile unit suitable for short step excavation is characterized by: The auxiliary scraper arm assembly (4) comprises an arm turntable, which is mounted on the main frame structure (1). The output end of the arm turntable is connected to a folding arm, and the other end of the folding arm is connected to an integrated scraper and digging tool. The integrated scraper and digging tool is located next to the main excavation arm assembly (2).

5. According to claim 1, a NATM integrated mobile unit suitable for short step excavation is characterized in that: The arch anchor arm assembly (6) comprises a sliding mechanism, which is installed on the top of the main frame structure (1), the output end of the sliding mechanism is connected to the arm turntable, the output end of the arm turntable is connected to the telescopic arm, and the output end of the telescopic arm is respectively installed with an operating basket, an anchor drill and an arch gripper.

6. The NATM integrated mobile unit suitable for short step excavation according to claim 1 is characterized in that: The intermediate arch spray arm assembly (7) comprises a sliding mechanism, which is installed on the top of the main frame structure (1). 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 spraying operation head and an arch gripper, and the spraying operation head is connected to the mobile spraying tooling (9) through a pipeline.

7. The NATM integrated mobile unit suitable for short step excavation according to claim 1 is characterized in that: The slag scraper (5) comprises a box-type chute, which is installed on the side of the main frame structure (1). The other end of the box-type chute is arranged close to the telescopic conveyor belt (8). 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.

8. The NATM integrated mobile unit suitable for short step excavation according to claim 2 is characterized by: The rear excavation arm assembly (3) comprises an arm turntable, which is installed on the output end of the single-layer sliding mechanism at the rear side of the frame mechanism. The output end of the arm turntable is connected to a folding arm, and the other end of the folding arm is connected to an integrated excavation tool.

9. The NATM integrated mobile unit suitable for short step excavation according to claim 1 is characterized in that: The mobile spraying tool (9) comprises a pump group, the pump group is connected to a spraying pipeline, and the other end of the spraying pipeline is connected to the middle arch spray arm assembly (7).

10. A short step excavation construction method, using a new Austrian Tunneling integrated mobile unit suitable for short step excavation according to claim 1, characterized in that: After including the following: S1: The main excavation arm assembly (2) performs excavation operations at the front side, and the auxiliary slag removal arm assemblies (4) on the left and right sides perform auxiliary excavation and slag removal operations; S2: The slag scraper (5) transfers the slag to the telescopic conveyor belt (8), and the telescopic conveyor belt (8) transfers the slag to the slag truck behind the main platform structure (1); S3: The auxiliary scraper arm assembly (4) cooperates with the main excavation arm assembly (2) to perform trimming, risk removal, arch footing, and complete the excavation work of the tunnel construction cycle; S4: When the excavation is completed, the middle arch spray arm assembly (7) cooperates with the pump group of the mobile spraying tooling (9) to carry out the initial spraying operation; S5: After the initial spraying and curing is completed, anchor bolting is performed through the arch anchor arm assemblies (6) on both sides; S6: After the bolting operation is completed, re-spraying is carried out to complete the cycle operation of the initial support of the tunnel; S7: When excavating the upper step, staggered excavation is performed on the lower step at the same time. When excavating the lower step, invert construction is performed. The slag turning operation is performed through the left-right staggered excavation method and the telescopic slag discharge platform; and the excavation cycle is completed.

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