CN220133965U - Tunneling equipment for tunnel expanding and excavating - Google Patents

Abstract

The present disclosure relates to a tunneling apparatus for tunnel boring, comprising: the cutterhead structure (10) comprises a cutterhead body (11) and a cutter (12), wherein the cutter (12) is arranged on the cutterhead body (11), the cutterhead body (11) is provided with a first through area (111) and a second through area which penetrate through along the tunneling direction (A) of tunneling equipment, the rotation center of the cutterhead body (11) is located in the first through area (111), and the second through area is located on the radial outer side of the first through area (111); the shield body structure (20) is positioned at the rear side of the cutterhead structure (10) along the tunneling direction (A) of tunneling equipment; the main driving mechanism (30) is in driving connection with the cutter head body (11) and is configured to drive the cutter head body (11) to rotate; and a slag discharging mechanism (40) configured to discharge the slag, which enters the soil bin (B) from the second penetration region, rearward; wherein, in the radial direction of the cutter head body (11), the slag discharging mechanism (40) is positioned outside the first through region (111).

Description

Tunneling equipment for tunnel expanding and excavating

Technical Field

The disclosure relates to the field of tunnel construction, in particular to tunneling equipment for tunnel expansion and excavation.

Background

Since the 19 th century, a great deal of tunnel engineering was built in China. Especially, after the shield method is applied, the shield tunnel construction technology is broken through continuously, and the shield tunnel has tended to be cured. However, early tunnels are limited by technology, the average span and the cross-sectional area of the tunnels are small, and the requirements of the modern society cannot be met. In recent years, urban tunnel construction projects are numerous, an original tunnel line route is often a core route of a city, and if a newly-built tunnel is to directly replace the original tunnel, the new tunnel is limited by the influence of urban construction planning, construction cost and other aspects. How to realize the expansion and excavation, tunnel section and construction technology improvement on the basis of the original tunnel line is a new future direction.

In some related technologies, an original tunnel with a smaller diameter is excavated by an excavation mechanism on a ring cutter, and slag is pushed to a slag discharging system at the rear side by a spiral blade in the excavation mechanism, so that the slag discharging system discharges the slag in the process of excavation.

Disclosure of Invention

According to research, the slag discharging system in the related technology occupies a large space, and has certain interference on the operation of personnel or objects in the process of expanding and excavating, so that the construction efficiency is affected.

In view of the above, the embodiments of the present disclosure provide a tunneling apparatus for tunnel excavation, which can improve construction efficiency.

In one aspect of the present disclosure, there is provided a tunneling apparatus for tunneling, comprising:

the cutter head structure comprises a cutter head body and a cutter, wherein the cutter is arranged on the cutter head body, the cutter head body is provided with a first through area and a second through area which are communicated along the tunneling direction of the tunneling equipment, the rotation center of the cutter head body is positioned in the first through area, and the second through area is positioned at the radial outer side of the first through area;

the shield body structure is positioned at the rear side of the cutterhead structure along the tunneling direction of the tunneling equipment;

the main driving mechanism is arranged in the shield body structure, is in driving connection with the cutter head body and is configured to drive the cutter head body to rotate; and

the slag discharging mechanism is arranged in the shield body structure and is configured to discharge slag soil entering the soil bin positioned at the rear side of the cutter head body from the second through area backwards;

wherein, in the radial direction of the cutter head body, the slag discharging mechanism is positioned at the outer side of the first through area.

In some embodiments, the second through region includes a plurality of openings located at a radially outer edge of the cutter head, the plurality of openings being spaced apart in a circumferential direction of the cutter head.

In some embodiments, the shield body structure comprises a front shield structure comprising:

the front shield center ring frame is connected with the main driving mechanism;

a front shield external cutting ring connected with the front shield center ring frame; and

an inner front shield cutting ring which is connected with the front shield center ring frame and is positioned on the radial inner side of the outer front shield cutting ring;

the cutter head body, the front shield center ring frame, the front shield external cutting ring and the front shield internal cutting ring encircle the annular soil bin.

In some embodiments, the slag discharging mechanism comprises:

the slag discharging interface is arranged on the front shield center ring frame and is communicated with the soil bin;

and the slurry discharging pipeline is positioned and connected with the slag discharging interface and is configured to discharge slag backwards from the slag discharging interface in a muddy water slag discharging mode.

In some embodiments, the slag discharge interface and the slurry discharge pipe are both located on the underside of a cylindrical region formed by the first through region extending in a direction opposite to the tunneling direction of the tunneling apparatus.

In some embodiments, the front inner shield ring is located inside the first through region in a radial direction of the cutterhead body and partially extends into the first through region along a tunneling direction of the tunneling device; the tunneling apparatus further comprises:

and the annular sealing structure is positioned between the front shield inner cutting ring and the inner wall of the first through region.

In some embodiments, the shield body structure further comprises a mid-shield structure comprising:

a middle shield shell;

the middle shield ring frame is positioned at the inner side of the middle shield shell and is fixedly connected with the middle shield shell; and

the door-shaped supporting frame is positioned at the inner side of the middle shield ring frame and is fixedly connected with the middle shield ring frame,

the cutter head comprises a cutter head body, a middle shield ring frame, a door-shaped support frame and a cutter head body, wherein the door-shaped support frame and the middle shield ring frame enclose a hollow channel, and the rotation axis of the cutter head body penetrates through the hollow channel.

In some embodiments, the gabled support frame comprises:

the bottom ends of the first vertical beam and the second vertical beam are fixedly connected with the middle shield ring frame; and

the cross beam is positioned on the upper sides of the first vertical beam and the second vertical beam, is fixedly connected with the top end of the first vertical beam and the top end of the second vertical beam, and is fixedly connected with the middle shield ring frame.

In some embodiments, the ripping apparatus further includes:

a propulsion mechanism mounted on the mid shield ring frame configured to propel the tunneling apparatus; and

and the duct piece splicing machine is arranged on the gate-shaped support frame and is configured to splice duct pieces of the tunnel after the expansion and excavation.

In some embodiments, the peripheral diameter of the cutter head is configured to be greater than a first diameter of the tunnel to be excavated, and the second diameter of the first through region at the front side of the cutter head is configured to be less than the first diameter of the tunnel to be excavated.

Therefore, according to the embodiment of the disclosure, the cutter head body with the first through area and the rotation center located in the first through area and the cutter arranged on the cutter head body are used for expanding and excavating the existing tunnel, the soil bin at the rear side of the cutter head body receives excavated dregs by the second through area on the cutter head body, and the dreg discharging mechanism located at the outer side of the first through area in the radial direction of the cutter head body is used for discharging dregs, so that interference of a dreg discharging system on operation of personnel or objects in the expanding and excavating process of the existing tunnel can be reduced or eliminated, and the construction efficiency is improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.

The disclosure may be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic view of a working scenario of an embodiment of a tunneling apparatus for tunneling according to the present disclosure;

FIG. 2 is a schematic structural view of a cutterhead structure in an embodiment of a ripping apparatus for use in tunnel boring according to the present disclosure;

FIG. 3 is a schematic structural view of some embodiments of a ripping apparatus for use in tunnel boring according to the present disclosure;

FIG. 4 is a schematic structural view of a front shield structure in an embodiment of a ripping apparatus for use in tunnel boring according to the present disclosure;

fig. 5 is a schematic structural view of a mid-shield structure in an embodiment of a tunneling apparatus for tunnel boring according to the present disclosure.

It should be understood that the dimensions of the various elements shown in the figures are not drawn to actual scale. Further, the same or similar reference numerals denote the same or similar members.

Detailed Description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative, and is in no way intended to limit the disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments should be construed as exemplary only and not limiting unless otherwise specifically stated.

The terms "first," "second," and the like, as used in this disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises" and the like means that elements preceding the word encompass the elements recited after the word, and not exclude the possibility of also encompassing other elements. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.

In this disclosure, when a particular device is described as being located between a first device and a second device, there may or may not be an intervening device between the particular device and either the first device or the second device. When it is described that a particular device is connected to other devices, the particular device may be directly connected to the other devices without intervening devices, or may be directly connected to the other devices without intervening devices.

All terms (including technical or scientific terms) used in this disclosure have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs, unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

Fig. 1 is a schematic view of a working scenario of an embodiment of a tunneling apparatus for tunnel boring according to the present disclosure. Fig. 2 is a schematic structural view of a cutterhead structure in an embodiment of a tunneling apparatus for tunnel boring according to the present disclosure. Fig. 3 is a schematic structural view of some embodiments of a ripping apparatus for tunnel boring according to the present disclosure.

Referring to fig. 1-3, an embodiment of the present disclosure provides a tunneling apparatus for tunneling, including: the device comprises a cutter head structure 10, a shield body structure 20, a main driving mechanism 30 and a slag discharging mechanism 40. The cutterhead structure 10 comprises a cutterhead body 11 and a cutter 12, the cutter 12 being mounted on the cutterhead body 11. The cutter head 11 may be mounted with a plurality of cutters 12, and the plurality of cutters 12 may be distributed at different positions on the front surface of the cutter head 11 in the circumferential direction and the radial direction.

The cutterhead 11 has a first through region 111 and a second through region that penetrate in the direction of the heading a of the heading machine. The rotation center of the cutter head 11 is located in the first through area 111. When the existing tunnel is expanded, the first through area 111 is opposite to the hollow area of the existing tunnel, and the existing tunnel can be used continuously to a certain extent, so that the influence of the expanded operation on the use of the existing tunnel is reduced.

The second through region is located radially outward of the first through region 111. The soil bin at the rear side of the cutter head body 11 can receive the dregs formed in the expanding and digging process by utilizing the second through area on the cutter head body 11.

The shield structure 20 is located at the rear side of the cutterhead structure 10 along the tunneling direction a of the tunneling apparatus. The shield structure 20 may support the extended tunnel during forward tunneling of the tunneling apparatus and may utilize the interior space to house and accommodate other components of the tunneling apparatus.

The main driving mechanism 30 is disposed in the shield structure 20, and is in driving connection with the cutter head 11, and configured to drive the cutter head 11 to rotate.

The slag discharging mechanism 40 is disposed in the shield structure 20, and is configured to discharge the slag, which enters the soil bin B located at the rear side of the cutter head 11 from the second penetration region, backward, wherein the slag discharging mechanism 40 is located outside the first penetration region 111 in the radial direction of the cutter head 11.

The slag discharging mechanism is positioned at the outer side of the first through area in the radial direction of the cutter head body for discharging slag, so that the slag discharging system does not occupy the space range corresponding to the first through area, the space is utilized to realize the operation of personnel or objects, the interference of the slag discharging system on the operation of the personnel or objects in the expanding and digging process of the existing tunnel is reduced or eliminated, and the construction efficiency is improved.

In fig. 1, the black arrow corresponds to the heading direction a of the heading device, according to which the shield structure 20 is located at the rear side of the cutterhead structure 10. The cutterhead structure 10 of the tunneling device in fig. 1 acts on one end of a tunnel D to be excavated in an expanding manner, and the tunneling device performs segment assembly on the tunnel F after expanding and excavating in the gradual expanding and excavating process of the tunnel D to be excavated in an expanding manner. The diameter of the tunnel F after the expansion and excavation is larger than that of the tunnel D to be expanded and excavated.

Referring to fig. 2, in some embodiments, the second through region includes a plurality of openings 112 located at a radially outer edge of the cutter head 11, and the plurality of openings 112 are spaced apart in a circumferential direction of the cutter head 11. When the cutter 12 of the cutter head 11 cuts soil, rock and the existing tunnel structure at the front side of the cutter head 11, the cut dregs reach the soil bin B at the rear side of the cutter head 11 through the openings 112, so that the dregs discharging mechanism can be conveniently discharged from the soil bin B further backwards. The cutter head with the structure has smaller size in the tunneling direction A of tunneling equipment, and a slag discharging system formed by the second through area, the soil bin and the slag discharging mechanism has compact space, thereby being beneficial to reducing the size of the tunneling equipment and reducing or eliminating the interference to the operation of personnel or objects in the process of expanding the tunneling of the existing tunnel.

Referring to fig. 3, in some embodiments, the outer diameter D1 of the cutter head 11 is configured to be greater than the first diameter D0 of the tunnel D to be excavated, and the second diameter D2 of the first through region 111 at the front side of the cutter head 11 is configured to be less than the first diameter D0 of the tunnel D to be excavated. Like this, cutter head structure 10 can directly wait to expand the tunnel wall of digging tunnel D and cut, and need not to use the part of dismantling waiting to expand tunnel D, improves the efficiency of construction on the one hand, and on the other hand saves the space that such part took up, eliminates its interference that probably moves personnel or article, also is favorable to improving the efficiency of construction.

Fig. 4 is a schematic structural view of a front shield structure in an embodiment of a tunneling apparatus for tunnel boring according to the present disclosure. Referring to fig. 3 and 4, in some embodiments, the shield body structure 20 includes a front shield structure 21. The front shield structure 21 includes: a front shield center ring frame 211, a front shield outer notch ring 212, and a front shield inner notch ring 213. The front shield center ring frame 211 is connected to the main drive mechanism 30 to provide a mounting base for the main drive mechanism 30.

The main drive mechanism 30 may comprise an annular drive structure mounted to the front shield center ring frame 211 in the form of flange bolts. The annular driving structure can comprise a driving motor or a hydraulic motor and other power systems, and can provide cutter torque for the cutter structure to expand and excavate the tunnel. The annular driving structure may have a stator portion fixedly connected to the front shield center ring frame 211 and a rotor portion flange-connected to the cutter head body.

The front shield outer incision ring 212 is connected to the front shield center ring frame 211, for example, by welding. The front shield external cutting ring 212 can support the soil layer around the tunnel at the rear side of the cutter head body 11 and bear the water and soil pressure at the outer side of the enlarged tunnel.

The front shield inner notch ring 213 is connected with the front shield center ring frame 211 and is located at the radial inner side of the front shield outer notch ring 212, and the cutter head 11, the front shield center ring frame 211, the front shield outer notch ring 212 and the front shield inner notch ring 213 enclose the annular soil bin B. The slag discharging system formed in the way can effectively bear water and soil pressure in the construction process, can adjust ground surface subsidence control in the construction process, improves stability of an expanded excavation construction area, and reduces collapse risk in the construction process.

In fig. 3 and 4, the slag discharging mechanism 40 may include: a slag discharge interface 41 and a slurry discharge pipeline 42. The slag discharging interface 41 is arranged on the front shield center ring frame 211 and is communicated with the soil bin B. A slurry discharge pipe 42 is connected to the slag discharge port 41 and is configured to discharge slag backward from the slag discharge port 41 by means of muddy water slag discharge. The slag discharging mechanism 40 may further include a slurry discharging pump to provide power for slag discharging. The slurry discharging pipe 42 can be arranged more conveniently by the mud water discharging mode, so that the occupied space is reduced. In other embodiments, the deslagging mechanism 40 can be arranged at the mouth in a spiral conveying and slurry discharging mode.

Specifically, referring to fig. 3, the slag discharge interface 41 and the slurry discharge pipe 42 may be located at the lower side of a cylindrical region E formed by extending the first through region 111 in the opposite direction of the tunneling direction a of the tunneling apparatus. The cylindrical area E here does not contain a substantial part of the cutterhead 11 nor the pulp discharging pipe of the slag discharging mechanism 40, and the related personnel and objects can pass through the space more conveniently, thereby improving the working efficiency.

In other embodiments, the slag discharging interface 41 and the slurry discharging pipe 42 may be located in other directions of the cylindrical area E formed by extending the first through area 111 in the opposite direction of the tunneling direction a of the tunneling apparatus, for example, on the left and right sides or on any left and right sides of the cylindrical area E.

Referring to fig. 3 and 4, in some embodiments, the front inner cut-out ring 213 is located inside the first through region 111 in the radial direction of the cutter head 11 and partially protrudes into the first through region 111 in the tunneling direction a of the tunneling apparatus.

The ripper apparatus also includes an annular seal structure 60. An annular seal 60 is located between the front intra-shield ring 213 and the inner wall of the first through-going region 111. The annular seal structure 60 can effectively block the slag or slurry in the soil bin from flowing into the hollow area of the existing tunnel. Specifically, the annular seal structure 60 may include a plurality of annular earth bin seal brushes arranged at intervals along the heading direction a of the heading equipment.

Fig. 5 is a schematic structural view of a mid-shield structure in an embodiment of a tunneling apparatus for tunnel boring according to the present disclosure. Referring to fig. 3 and 5, in some embodiments, the shield body structure 20 further includes a mid-shield structure 22. The middle shield structure 22 includes: the middle shield shell 221, the middle shield ring frame 222 and the portal support frame 223. The middle shield shell 221 can support the peripheral soil layer of the tunnel at the rear side of the front shield structure 21 and bear the water and soil pressure at the outer side of the extended tunnel.

The middle shield ring frame 222 is located inside the middle shield shell 221 and is fixedly connected with the middle shield shell 221. The door-shaped support frame 223 is located inside the middle shield ring frame 222 and is fixedly connected with the middle shield ring frame 222, wherein the door-shaped support frame 223 and the middle shield ring frame 222 enclose a hollow channel C, and the rotation axis of the cutterhead 11 passes through the hollow channel C. The hollow channel C of the portal-shaped supporting frame 223 can be used for passing people or articles, so that the interference to the operation of the people or articles is reduced, and the construction efficiency is improved.

In fig. 5, the gabion support frame 223 includes: a first vertical beam 223a, a second vertical beam 223b, and a cross beam 223c. The bottom ends of the first vertical beams 223a and the second vertical beams 223b are fixedly connected with the middle shield ring frame 222. The cross beam 223c is located at the upper sides of the first vertical beam 223a and the second vertical beam 223b, fixedly connected to the top end of the first vertical beam 223a and the top end of the second vertical beam 223b, and fixedly connected to the middle shield ring frame 222. The first vertical beam 223a, the second vertical beam 223b, and the cross beam 223C may enclose a hollow channel C with the middle shield ring frame 222.

Referring to fig. 3, in some embodiments, the ripping apparatus further includes: a propulsion mechanism 51 and a segment erector 52. A propulsion mechanism 51 is mounted on the centre shield ring 222 and is configured to propel the ripper apparatus. Propulsion mechanism 51 may provide motive power for advancing the ripper apparatus, which may include a plurality of propulsion cylinders arranged at circumferentially spaced intervals.

In fig. 3, a hinge system 54 may be provided between the front shield structure 21 and the rear shield structure 22 to provide attitude adjustment capability of the ripping apparatus. The junction of the anterior shield outer incision ring 212 and the medial shield shell 221 may be provided with a hinge ring and seal arrangement to resist external water and soil pressure.

The segment erector 52 is mounted on the gate-shaped support frame 223 and is configured to segment the enlarged tunnel F. The segment erector 52 can be matched with the tail shield structure 23 which is connected with or integrally made with the middle shield structure 22 to segment the tunnel F after the expansion and excavation. The tunneling apparatus may further include a rear mating structure 53, such as a plurality of rear mating trailers, for carrying components of the electro-mechanical system and the hydraulic system required for the construction of the tunneling apparatus, providing mating facilities such as water and electricity, and implementing the transfer and supplement of the segments. The rear mating structure 53 may also be a portal shaped support frame as desired to form a hollow channel to facilitate the passage of personnel or objects, reduce interference, and increase efficiency.

Thus, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concepts of the present disclosure, some details known in the art are not described. How to implement the solutions disclosed herein will be fully apparent to those skilled in the art from the above description.

Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that the foregoing embodiments may be modified and equivalents substituted for elements thereof without departing from the scope and spirit of the disclosure. The scope of the present disclosure is defined by the appended claims.

Claims (10)

1. A tunneling apparatus for tunneling, comprising:

the cutterhead structure (10) comprises a cutterhead body (11) and a cutter (12), wherein the cutter (12) is installed on the cutterhead body (11), the cutterhead body (11) is provided with a first through area (111) and a second through area which penetrate through along the tunneling direction (A) of the tunneling equipment, the rotation center of the cutterhead body (11) is located in the first through area (111), and the second through area is located on the radial outer side of the first through area (111);

the shield body structure (20) is positioned at the rear side of the cutterhead structure (10) along the tunneling direction (A) of the tunneling equipment;

the main driving mechanism (30) is arranged in the shield body structure (20) and is in driving connection with the cutter head body (11) and is configured to drive the cutter head body (11) to rotate; and

a slag discharging mechanism (40) arranged in the shield body structure (20) and configured to discharge slag, which enters the soil bin (B) positioned at the rear side of the cutter head body (11) from the second through region, backward;

wherein, in the radial direction of the cutter head body (11), the slag discharging mechanism (40) is positioned outside the first through region (111).

2. A tunneling apparatus for tunnel boring according to claim 1 wherein said second through region includes a plurality of openings (112) located at a radially outer edge of said cutterhead body (11), said plurality of openings (112) being spaced apart in a circumferential direction of said cutterhead body (11).

3. A tunneling apparatus for expanding a tunnel according to claim 1 wherein said shield body structure (20) comprises a front shield structure (21), said front shield structure (21) comprising:

a front shield center ring frame (211) connected with the main driving mechanism (30);

a front shield external cutting ring (212) connected with the front shield center ring frame (211); and

an inner front shield ring (213) connected to the central front shield ring holder (211) and located radially inward of the outer front shield ring (212);

the cutter head comprises a cutter head body (11), a front shield center ring frame (211), a front shield external cutting ring (212) and a front shield internal cutting ring (213), wherein the front shield internal cutting ring (213) surrounds an annular soil bin (B).

4. A tunneling apparatus for tunnel boring according to claim 3 wherein the slag discharging mechanism (40) comprises:

the deslagging interface (41) is arranged on the front shield center ring frame (211) and is communicated with the soil bin (B);

and a slurry discharge pipe (42) connected to the slag discharge port (41) and configured to discharge slag backward from the slag discharge port (41) by means of muddy water slag discharge.

5. A tunneling apparatus for tunnel boring according to claim 4, characterized in that the slag discharge interface (41) and the slurry discharge pipe (42) are both located on the underside of a cylindrical region (E) formed by the first through region (111) extending in the opposite direction to the tunneling direction (a) of the tunneling apparatus.

6. A tunneling device for tunnel boring according to claim 3, characterized in that the front inner shield ring (213) is located inside the first through region (111) in the radial direction of the cutterhead body (11) and extends partly into the first through region (111) in the tunneling direction (a) of the tunneling device; the tunneling apparatus further comprises:

an annular sealing structure (60) is located between the front intra-shield ring (213) and the inner wall of the first through region (111).

7. A tunneling apparatus for expanding a tunnel according to claim 1 wherein said shield body structure (20) further comprises a mid shield structure (22), said mid shield structure (22) comprising:

a middle shield shell (221);

the middle shield ring frame (222) is positioned on the inner side of the middle shield shell (221) and is fixedly connected with the middle shield shell (221); and

the door-shaped supporting frame (223) is positioned at the inner side of the middle shield ring frame (222) and is fixedly connected with the middle shield ring frame (222),

the hollow channel (C) is surrounded by the portal supporting frame (223) and the middle shield ring frame (222), and the rotation axis of the cutter head body (11) passes through the hollow channel (C).

8. The tunneling apparatus for tunnel boring as claimed in claim 7, wherein the gabled support (223) comprises:

the first vertical beam (223 a) and the second vertical beam (223 b), wherein the bottom end of the first vertical beam (223 a) and the bottom end of the second vertical beam (223 b) are fixedly connected with the middle shield ring frame (222); and

the cross beam (223 c) is positioned on the upper sides of the first vertical beam (223 a) and the second vertical beam (223 b), fixedly connected with the top end of the first vertical beam (223 a) and the top end of the second vertical beam (223 b), and fixedly connected with the middle shield ring frame (222).

9. A tunneling apparatus for use in expanding a tunnel according to claim 7 further comprising:

a propulsion mechanism (51) mounted on the mid shield ring frame (222) configured to propel the ripping apparatus; and

and the duct piece splicing machine (52) is arranged on the portal-shaped support frame (223) and is configured to perform duct piece splicing on the tunnel (F) after the expansion and excavation.

10. A tunneling apparatus for tunnel boring according to any of claims 1-9 wherein the peripheral diameter (D1) of the cutter head (11) is configured to be greater than the first diameter (D0) of the tunnel (D) to be bored, and the second diameter (D2) of the first through region (111) at the front side of the cutter head (11) is configured to be less than the first diameter (D0) of the tunnel (D) to be bored.