CN113847053A

CN113847053A - Tunnel slag hopper

Info

Publication number: CN113847053A
Application number: CN202110902334.8A
Authority: CN
Inventors: 冉晓辉; 阎明东; 赵杰; 郝亮
Original assignee: China Railway 19th Bureau Group Co Ltd; Fifth Engineering Co Ltd of China Railway 19th Bureau Group Co Ltd
Current assignee: China Railway 19th Bureau Group Co Ltd; Fifth Engineering Co Ltd of China Railway 19th Bureau Group Co Ltd
Priority date: 2021-08-06
Filing date: 2021-08-06
Publication date: 2021-12-28
Anticipated expiration: 2041-08-06
Also published as: CN113847053B

Abstract

The invention provides a tunnel slag bucket, which comprises a first sleeve, a turnover cover and a locking mechanism, wherein the first sleeve is provided with a bottom opening, the turnover cover is hinged to the bottom opening of the first sleeve through a hinge assembly, the edge of the bottom opening of the first sleeve is matched with the edge of the top of the turnover cover, when the slag soil is required to be transferred through the tunnel slag bucket, after the slag soil in the tunnel slag bucket is filled, the turnover cover which closes the bottom opening of the first sleeve is locked to the first sleeve through the locking mechanism, the tunnel slag bucket is lifted through a lifting system to enable the tunnel slag bucket to be lifted and transferred in a narrow lifting hole, when the tunnel slag bucket is conveyed to a blanking position, after the tunnel slag bucket is supported on the ground, the locking state between the first sleeve and the turnover cover is released, the first sleeve supported on the ground is lifted again through the lifting system, and the turnover cover moves downwards relative to the first sleeve, the bottom opening of first sleeve is opened, accomplishes unloading of dregs, has improved the efficiency of unloading in the tunnel sediment fill.

Description

Tunnel slag hopper

Technical Field

The invention relates to the technical field of subway construction, in particular to a tunnel slag hopper.

Background

The subway construction in China is carried out in a main urban traffic road and a dense personnel area in a long distance, so that the engineering geology is complex and changeable, the hydrogeology is changeable, pipelines in urban areas are various, houses and bridges are arranged under the subway construction, the subway construction is carried out in old buildings and the like, the distance from the subway construction to the structure is short, the narrow conditions of a construction field are limited, the construction difficulty is large, the safety risk is high, and the slag tapping working link is particularly important in the construction for achieving the purpose of 'quick closing' of tunnel excavation.

Most of the sediment fill among the prior art structure is comparatively complicated, and is bulky, is unsuitable to be lifted directly from narrow lift hole with the sediment fill that is filled with the dregs in the underground tunnel and shifts in order to accomplish the transport of dregs, and the inventor has adopted the box that the top was equipped with the open-ended to carry out the transfer of dregs, pours the dregs into the box from the open-top into in the box, and lift systems such as rethread loop wheel machine shift the box through narrow lift hole, though solved the dregs can carry out the problem of lift transport from narrow hole, nevertheless the pouring of the dregs in the box still need to shovel the dregs from the open-top in proper order with the manual mode, and efficiency is lower.

Disclosure of Invention

The invention provides a tunnel slag hopper, which aims to solve the technical problems that the slag hopper in the prior art cannot transfer slag in an underground tunnel from a narrow lifting hole and cannot pour the slag in the slag hopper out quickly.

The invention provides a tunnel slag hopper which comprises a first sleeve, a turnover cover and a locking mechanism, wherein a connecting assembly used for being connected with a lifting system is arranged at the top of the first sleeve, the first sleeve is provided with a bottom opening, the first sleeve completes lifting movement through the driving of the lifting system, the turnover cover is hinged to the bottom opening of the first sleeve through a hinge assembly, the turnover cover rotates through the hinge assembly to open or close the bottom opening of the first sleeve, the edge of the bottom opening of the first sleeve is matched with the edge of the top of the turnover cover, and the locking mechanism is used for locking the turnover cover after the bottom opening of the first sleeve is closed to the first sleeve.

Furthermore, a side plate assembly is arranged on the top edge of the turnover cover, the top of the side plate assembly is obliquely arranged, and the top of the side plate assembly is matched with the bottom opening edge of the first sleeve.

Specifically, the side plate assembly may be a single side plate or an assembly formed by a plurality of plate bodies arranged on the top edge of the flip cover.

Further, locking mechanism includes the body of rod, first cylinder and first locating part, the body of rod is equipped with the hinged end and passes through the hinged end articulate in first sleeve, first cylinder set up in flip, the body of rod passes through the hinged end rotates and makes first locating part butt or keep away from the bottom of first cylinder, the butt the bottom of first cylinder first locating part is right the downstream of first cylinder plays limiting displacement.

Further, locking mechanism still includes the second cylinder and second locating part, the second locating part set up in the body of rod, first locating part with the second locating part is located respectively the both sides of the axis of the body of rod are located respectively the both sides of hinged end, the body of rod passes through the hinged end rotates and makes the second locating part butt or keep away from the bottom of the second cylinder, the butt the top of the second cylinder the second locating part is right the rebound of the second cylinder plays limiting displacement.

Further, the end of the rod body provided with the second limiting part is heavier than the end of the rod body provided with the first limiting part.

Further, the hinge assembly comprises a rotating shaft, a second sleeve and a third sleeve, the rotating shaft is connected in series with the middle holes of the second sleeve and the third sleeve and is rotatably connected with the second sleeve and the third sleeve, the second sleeve is connected with the first sleeve, and the third sleeve is connected with the flip cover.

Furthermore, lubricating oil is coated on the surface of the rotating shaft, which is used for connecting the second sleeve and the third sleeve.

Furthermore, the bottom end of the side face of the first sleeve is provided with a first angle steel, and the top end of the side face of the turnover cover is provided with a second angle steel.

Further, the connecting assembly comprises a plurality of lifting lugs, the plurality of lifting lugs are distributed in a circumferential array by taking the center of the first sleeve as a center, and the number of the lifting lugs is greater than or equal to three.

Furthermore, the bottom of the flip cover is provided with a third angle steel.

The tunnel slag hopper provided by the invention has the beneficial effects that:

when the transfer of the muck is required to be carried out through the tunnel muck bucket, the muck is shoveled into the upper surface of the turnover cover from the bottom opening of the first sleeve, after the muck in the tunnel muck bucket is filled, the turnover cover which closes the bottom opening of the first sleeve is locked on the first sleeve through the locking mechanism after the edge of the bottom opening of the first sleeve is attached to the top edge of the turnover cover, the tunnel muck bucket is lifted through a lifting system such as a crane and the like, so that the tunnel muck bucket can be lifted and transferred in a narrow lifting hole, when the tunnel muck bucket is transferred to a blanking position, after the tunnel muck bucket is supported on the ground, the locking state between the first sleeve and the turnover cover is released through the locking mechanism, the first sleeve supported on the ground is lifted again through the lifting system, the turnover cover moves downwards relative to the first sleeve under the self gravity of the turnover cover and the rotation action of the hinge assembly, and the bottom opening of the first sleeve is opened, the discharging of the slag soil is completed, and the discharging efficiency in the tunnel slag hopper is improved.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

FIG. 1 is a schematic structural front view of a tunnel slag hopper in a state that a bottom opening is closed according to a first embodiment;

FIG. 2 is a schematic right-view diagram of the structure of the tunnel slag hopper in the first embodiment in a state that the bottom opening is closed;

FIG. 3 is a rear view schematically illustrating the structure of the tunnel slag hopper according to the first embodiment;

FIG. 4 is a schematic front view of the tunnel slag hopper of the first embodiment in a state that the bottom opening is ready to be opened;

FIG. 5 is a right-side schematic view of the tunnel slag hopper of the first embodiment in a state that the bottom opening is open and the first sleeve is lifted;

fig. 6 is a schematic right view of the tunnel slag hopper of the first embodiment in a state where the bottom opening is open and the tunnel slag hopper is lifted as a whole;

fig. 7 is a schematic three-dimensional structure diagram of a turning cover of the tunnel slag hopper in the first embodiment;

fig. 8 is an exploded schematic view of a three-dimensional structure of a first sleeve and a flip cover of a tunnel slag hopper according to a second embodiment;

FIG. 9 is a schematic structural front view of a tunnel slag hopper of the third embodiment in a state that the bottom opening is closed;

FIG. 10 is a schematic structural front view of a tunnel slag hopper of the third embodiment in a state that the bottom opening is closed;

FIG. 11 is a rear view schematically illustrating the structure of the tunnel slag hopper of the third embodiment;

FIG. 12 is a schematic top view of the structure of a tunnel slag hopper of the third embodiment;

description of reference numerals:

1. a first sleeve; 11. the bottom is open; 12. the top is open; 13. a first angle steel; 14. a fourth angle steel; 2. a cover is turned; 21. a side plate assembly; 22. a second angle steel; 23. third angle steel; 211. a rear side plate; 212. a left side plate; 213. a right side plate; 3. a locking mechanism; 31. a rod body; 32. a first column; 33. a first limit piece; 34. a second cylinder; 35. a second limiting member; 36. a hinged end; 4. lifting lugs; 41. a frame; 5. a hinge assembly; 51. a rotating shaft; 52. a second sleeve; 53. a third sleeve; 6. a base; 7. and (4) the ground.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.

In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, reference to the description of the terms "one embodiment," "first-aspect embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

The following describes the tunnel slag hopper provided by the invention with reference to fig. 1-12.

As shown in fig. 1 to 7, a tunnel slag hopper according to a first embodiment of the present invention includes a first sleeve 1, a flip cover 2, and a locking mechanism 3, a connecting assembly for connecting to a lifting system is disposed at a top of the first sleeve 1, the first sleeve 1 is provided with a bottom opening 11, the first sleeve 1 completes a lifting motion by being driven by the lifting system, the flip cover 2 is hinged to the bottom opening 11 of the first sleeve 1 by a hinge assembly 5, the flip cover 2 rotates by the hinge assembly 5 to open or close the bottom opening 11 of the first sleeve 1, an edge of the bottom opening 11 of the first sleeve 1 is matched with an edge of a top of the flip cover 2, and the locking mechanism 3 is configured to lock the flip cover 2, which closes the bottom opening 11 of the first sleeve 1, to the first sleeve 1.

When the slag soil is required to be transferred through the tunnel slag hopper, the slag soil is shoveled into the upper surface of the turnover cover 2 from the bottom opening 11 of the first sleeve 1, after the filling of the slag soil in the tunnel slag hopper is finished, the turnover cover 2 which closes the bottom opening 11 of the sleeve is locked on the first sleeve 1 through the locking mechanism 3 after the edge of the bottom opening 11 of the sleeve is attached to the top edge of the turnover cover 2, the tunnel slag hopper is lifted through a lifting system such as a crane and the like so that the tunnel slag hopper can be lifted and transferred in a narrow lifting hole, when the tunnel slag hopper is transferred to a blanking position, after the tunnel slag hopper is supported on the ground 7, the locking state between the first sleeve 1 and the turnover cover 2 is released through the locking mechanism 3, the first sleeve 1 which is supported on the ground 7 is lifted again through the lifting system, the turnover cover 2 moves downwards relative to the first sleeve 1 under the self gravity of the turnover cover 2 and the rotation action of the hinge assembly 5, the bottom opening 11 of the first sleeve 1 is opened, so that the discharging of the slag soil is completed, and the discharging efficiency in the tunnel slag hopper is improved.

Specifically, in this embodiment, the middle hole of the first sleeve 1 is vertically disposed and penetrates through the first sleeve 1, that is, the top of the first sleeve 1 is further provided with a top opening 12, the top opening 12 is communicated with a bottom opening 11, the bottom of the flip 2 is further provided with a plurality of bases 6 for stably supporting the flip 2 on the ground 7, the slag soil can be piled on the upper surface of the flip 2 in a manner of opening the bottom opening 11 of the first sleeve 1, the slag soil can also be directly poured into the slag soil from the top opening 12 of the first sleeve 1, and the slag soil enters the upper surface of the flip 2 through the top opening 12 of the first sleeve 1.

According to the present embodiment, the top edge of the flip cover 2 is provided with a side plate assembly 21, the top of the side plate assembly 21 is disposed obliquely, and the top of the side plate assembly 21 is matched with the edge of the bottom opening 11 of the first sleeve 1. With such an arrangement, the length of the opening-closing line of the bottom opening 11 of the first sleeve 1 for matching the obliquely arranged top of the side plate assembly 21 is longer than that of the horizontal opening-closing line for matching the upper surface of the flip cover 2, and when the height of the muck stored in the first sleeve 1 is higher than the height of the opening-closing line, more muck falls along the obliquely arranged opening-closing line when the bottom opening 11 of the first sleeve 1 is opened during deslagging.

Specifically, the side plate assembly 21 may refer to a single side plate, or may be an assembly formed by a plurality of plate bodies disposed on the top edge of the flip cover 2. In this embodiment, the side plate assembly 21 includes a rear side plate 211, a left side plate 212 with an inclined top, and a right side plate 213 with an inclined top, the left side plate 212 and the right side plate 213 are disposed oppositely, bottoms of the left side plate 212 and the right side plate 213 are connected to top edges of left and right sides of the flip 2, two sides of the rear side plate 211 are connected to a rear end of the left side plate 212 and a rear end of the right side plate 213, a bottom of the rear side plate 211 is connected to a top edge of a rear end of the flip 2, a rear end of the left side plate 212 is higher than a front end, and a rear end of the right side plate 213 is higher than a front end.

According to the embodiment, the locking mechanism 3 includes a rod 31, a first cylinder 32 and a first limiting member 33, the rod 31 has a hinge end 36 and is hinged to the first sleeve 1 through the hinge end 36, the first cylinder 32 is disposed on the flip 2, the rod 31 rotates through the hinge end 36 to enable the first limiting member 33 to abut against or be away from the bottom of the first cylinder 32, and the first limiting member 33 abutting against the bottom of the first cylinder 32 limits the downward movement of the first cylinder 32. By rotating the rod 31 in the direction D, the first position-limiting member 33 is away from the bottom of the first cylinder 32, when the first sleeve 1 is lifted, the first cylinder 32 can move downward relative to the first sleeve 1, that is, the flip cover 2 can move downward relative to the first sleeve 1, so that the bottom opening 11 of the first sleeve 1 is opened, the slag dumping operation is completed, after the edge of the bottom opening 11 is attached and turned open, by rotating the rod 31 in the direction opposite to the direction D, the first position-limiting member 33 can be moved to the position below the first cylinder 32 and abut against the bottom of the first cylinder 32, when the first sleeve 1 is lifted and away from the ground 7, the first cylinder 32 cannot move downward relative to the first sleeve 1 due to the position-limiting function of the first position-limiting member 33, that is, the flip cover 2 in the current state cannot move downward relative to the first sleeve 1, so as to ensure that when the slag is transferred, when the first sleeve 1 is lifted and leaves the ground 7, the bottom opening 11 of the first sleeve 1 is always kept in a closed state, and slag leakage is avoided.

According to this embodiment, the locking mechanism 3 further includes a second cylinder 34 and a second limiting member 35, the second limiting member 35 is disposed on the rod 31, the first limiting member 33 and the second limiting member 35 are respectively located at two sides of the axis of the rod 31 and at two sides of the hinge end 36, the rod 31 rotates through the hinge end 36 to make the second limiting member 35 abut against or be away from the bottom of the second cylinder 34, and the second limiting member 35 abutting against the top of the second cylinder 34 limits the upward movement of the second cylinder 34. The second limiting part 35, the first rod body 31 and the first limiting part 33 which are connected in sequence form a Z-shaped structure or an S-shaped structure, and the first limiting part 33 and the second limiting part 35 limit the downward movement of the flip cover 2 together, so that the bottom opening 11 of the first sleeve 1 can be kept in a closed state when slag charge is transferred.

According to the embodiment, the end of the rod 31 provided with the second limiting member 35 is heavier than the end of the rod 31 provided with the first limiting member 33. The center of gravity of the rod body 31 is concentrated on the second limiting member 35, and when the second limiting member 35 abuts against the second column 34, the second limiting member 35 generates a pressing force on the second column 34 after abutting against the second column 34, so that the locking effect is improved.

According to the present embodiment, the hinge assembly 5 includes a rotating shaft 51, a second sleeve 52 and a third sleeve 53, the rotating shaft 51 is connected in series to the middle holes of the second sleeve 52 and the third sleeve 53 and is rotatably connected to the second sleeve 52 and the third sleeve 53, the second sleeve 52 is connected to the first sleeve 1, the third sleeve 53 is connected to the flip 2, and specifically, in the present embodiment, the third sleeve 53 is connected to the rear side plate 211. The hinge assembly 5 is simple in structure and easy to enclose.

According to the present embodiment, the surface of the rotating shaft 51 for connecting the second sleeve 52 and the third sleeve 53 is coated with a lubricating oil. The friction between the rotating shaft 51 and the second and

third sleeves

52 and 53 is reduced, and the service life of the hinge assembly 5 is enhanced.

As shown in fig. 8, the second embodiment of the present invention provides a tunnel slag hopper, different from the side plate assembly 21 of the first embodiment of the present invention, the side plate assembly 21 of the present embodiment only includes a right side plate 213 with an inclined top, a bottom of the right side plate 213 is connected to a top edge of a right side of the flip cover 2, a rear end of the right side plate 213 is higher than a front end, and in the present embodiment, a third sleeve 53 is connected to a rear end of the flip cover 2.

According to the third embodiment of the invention, as shown in fig. 9-11, a tunnel slag hopper is provided, wherein a first angle steel 13 is arranged at the bottom end of the side surface of the first sleeve 1, and a second angle steel 22 is arranged at the top end of the side surface of the flip cover 2. The problem of dregs leakage caused by the fact that the bottom opening 11 of the first sleeve 1 and the top edge of the turnover cover 2 cannot be precisely matched due to the fact that the position near the opening line is deformed due to the transverse extrusion force of the dregs is avoided.

According to the present embodiment, the connecting assembly includes a plurality of lifting lugs 4, the plurality of lifting lugs 4 are distributed in a circumferential array around the center of the first sleeve 1, the number of the lifting lugs 4 is greater than or equal to three, specifically, in the present embodiment, the number of the lifting lugs 4 is four, and four lifting lugs 4 are respectively disposed at four corners of the top of the first sleeve 1. The first sleeve 1 can be smoothly lifted and lowered by connecting the four lifting lugs 4 with lifting ropes of a crane.

Specifically, as shown in fig. 12, in order to improve the fixing effect of the lifting lugs 4 on the first sleeve 1, a frame 41 is further disposed at the top of the first sleeve 1, and the inner edge of the frame 41 is connected with the 4 lifting lugs 4.

According to the present embodiment, the bottom of the flip 2 is provided with a third angle steel 23. The rigidity and the strength of the bottom of the flip cover 2 are enhanced, and the tunnel slag hopper is prevented from deforming under the gravity action of the slag after losing the supporting action force of the ground 7 during the slag transferring operation.

Specifically, in the present embodiment, the top of the side of the first sleeve 1 is provided with a fourth angle iron 14. The top of the side of placing first sleeve 1 is avoided being out of shape because of the transverse acting force of dregs to lead to the distance between a plurality of rings to increase, influence the accuracy of hoist and mount.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A tunnel slag hopper, comprising:

the top of the first sleeve is provided with a connecting component for connecting a lifting system, the first sleeve is provided with an opening at the bottom, and the first sleeve completes lifting movement through the driving of the lifting system;

a second sleeve is arranged on the first sleeve,

the turnover cover is hinged to the bottom opening of the first sleeve through a hinge component, the turnover cover enables the bottom opening of the first sleeve to be opened or closed through the rotation of the hinge component, and the edge of the bottom opening of the first sleeve is matched with the edge of the top of the turnover cover;

and the locking mechanism is used for locking the flip cover which closes the bottom opening of the sleeve to the first sleeve.

2. The tunnel slag hopper of claim 1, wherein a side plate assembly is arranged at the top edge of the flip cover, the top of the side plate assembly is obliquely arranged, and the top of the side plate assembly is matched with the bottom opening edge of the first sleeve.

3. The tunnel slag hopper according to claim 1, wherein the locking mechanism comprises a rod body, a first cylinder and a first limiting member, the rod body is provided with a hinged end and is hinged to the first sleeve through the hinged end, the first cylinder is arranged on the flip cover, the rod body rotates through the hinged end to enable the first limiting member to abut against or be far away from the bottom of the first cylinder, and the first limiting member abutting against the bottom of the first cylinder has a limiting effect on downward movement of the first cylinder.

4. The tunnel slag hopper according to claim 3, wherein the locking mechanism further comprises a second post and a second limiting member, the second limiting member is disposed on the post, the first limiting member and the second limiting member are respectively disposed on two sides of the axis of the post and on two sides of the hinge end, the post rotates through the hinge end to enable the second limiting member to abut against or be away from the bottom of the second post, and the second limiting member abutting against the top of the second post has a limiting effect on the upward movement of the second post.

5. The tunnel slag hopper of claim 4, wherein an end of the rod body provided with the second limiting member is heavier than an end of the rod body provided with the first limiting member.

6. The tunnel slag hopper of claim 1, wherein the hinge assembly comprises a shaft, a second sleeve and a third sleeve, the shaft is connected in series to the middle holes of the second sleeve and the third sleeve and is rotatably connected to the second sleeve and the third sleeve, the second sleeve is connected to the first sleeve, and the third sleeve is connected to the flip.

7. The tunnel slag hopper according to claim 6, wherein the surface of the rotating shaft for connecting the second sleeve and the third sleeve is coated with lubricating oil.

8. The tunnel slag hopper of claim 1, wherein a bottom end of the side of the first sleeve is provided with a first angle steel, and a top end of the side of the flip is provided with a second angle steel.

9. The tunnel slag hopper of claim 1, wherein the attachment assembly comprises a plurality of lifting lugs distributed in a circumferential array centered on the center of the first sleeve, the number of lifting lugs being greater than or equal to three.

10. The tunnel slag hopper of claim 1, wherein the bottom of the flip cover is provided with a third angle steel.