CN113982617A - Milling and excavating construction equipment for large-span mid-partition-free multi-arch tunnel - Google Patents

Abstract

The embodiment of the invention provides a large-span mid-partition-free multi-arch tunnel milling and excavating construction device, and relates to the field of tunnel construction devices. Aims to improve the efficiency of excavating the multi-arch part of the multi-arch tunnel. The excavator comprises an excavator small arm, a driving arm and a milling and digging head; the small arm of the excavator is provided with a first connecting part, and the driving arm is provided with a second connecting part; the milling and digging head is provided with a third connecting part and a fourth connecting part, the third connecting part is detachably connected with the first connecting part, and the fourth connecting part is detachably connected with the second connecting part; the milling and digging head rotates relative to the small arm of the excavator within a preset angle range from the vertical plane, and the preset angle range is 0-90 degrees. The milling and digging head can be directly assembled and connected with the small arm and the driving arm of the excavator, so that the utilization rate of the machine body is obviously improved, and the maneuverability is strong; in addition, the milling and digging head can swing within 0-90 degrees relative to the vertical surface, and dead-angle-free digging can be realized at different step heights; the method has obvious advantages for excavating the multi-arch part.

Description

Milling and excavating construction equipment for large-span mid-partition-free multi-arch tunnel

Technical Field

The invention relates to the field of tunnel construction equipment, in particular to large-span mid-partition-free multi-arch tunnel milling and excavating construction equipment.

Background

With the development of economy and social progress, the mechanization degree of the highway construction industry is higher and higher; various machines are developed in the direction of economy, high efficiency and multifunction. Generally, a milling and excavating machine is used in the excavation of a tunnel, and the milling and excavating machine directly purchases a complete machine, so that the cost is high, and the function is single.

The multi-arch part of the multi-arch tunnel is generally subjected to traditional blasting, drilling, charging and blasting are needed, the risk is high, hidden danger and inaccurate positioning exist in blasting, manual auxiliary operation is needed, surrounding rock is disturbed greatly, the quality of the prior tunnel is damaged, and construction safety cannot be guaranteed.

Disclosure of Invention

The invention aims to provide a large-span continuous arch tunnel milling construction device without an intermediate wall, which can improve the efficiency of continuous arch part excavation of the continuous arch tunnel.

Embodiments of the invention may be implemented as follows:

the embodiment of the invention provides milling and excavating construction equipment for a large-span diaphragm-free multi-arch tunnel, which comprises an excavator small arm, a driving arm and a milling and excavating head, wherein the excavator small arm is connected with the driving arm;

the small arm of the excavator is provided with a first connecting part, and the driving arm is provided with a second connecting part; the milling and digging head is provided with a third connecting part and a fourth connecting part, the third connecting part is detachably connected with the first connecting part, and the fourth connecting part is detachably connected with the second connecting part; the driving arm is used for driving the milling and digging head to rotate relative to the small arm of the excavator;

the milling and digging head rotates relative to the small arm of the excavator within a range of a preset angle with the vertical plane, and the range of the preset angle is 0-90 degrees.

In addition, the large-span mid-partition-free multi-arch tunnel milling construction equipment provided by the embodiment of the invention can also have the following additional technical characteristics:

optionally, the milling and excavating head comprises a mounting seat, a mounting frame, a cutting gear, a first bolt and a second bolt; the first connecting part is a first pin hole arranged on the small arm of the excavator, and the second connecting part is a second pin hole arranged on the driving arm; the third connecting part is a third pin hole arranged on the mounting seat, and the fourth connecting part is a fourth pin hole arranged on the mounting seat; the third pin hole corresponds to the first pin hole and is fixedly connected through the first bolt, and the fourth pin hole corresponds to the second pin hole and is fixedly connected through the second bolt;

the mounting bracket with the mount pad is connected, cut the gear setting and be in on the mounting bracket.

Optionally, the milling and excavating head further comprises a connecting frame; the mounting seat, the connecting frame and the mounting frame are connected in sequence.

Optionally, the mounting seat is provided with a first connecting plate; the connecting frame is provided with a second connecting plate and a third connecting plate; the mounting frame is provided with a fourth connecting plate; the first connecting plate, the second connecting plate, the third connecting plate and the fourth connecting plate are sequentially arranged, the first connecting plate is attached to and fixedly connected with the second connecting plate, and the third connecting plate is attached to and fixedly connected with the fourth connecting plate.

Optionally, the mounting frame comprises a first bracket and a second bracket; the first bracket is provided with the fourth connecting plate; the second support is connected to one end, far away from the fourth connecting plate, of the first support, and the second support is obliquely arranged relative to the first support, so that the second support is close to the front of construction relative to the first support in the construction process; the section gear is disposed on the second bracket.

Optionally, the second bracket includes a first support plate and a second support plate arranged at an interval; the first support plate and the second support plate are both connected with the first support, and the second support plate is far away from the front of construction relative to the first support plate; the second support plate is obliquely arranged relative to the first support plate, wherein the inclination angle of the second support plate relative to the vertical surface is larger than that of the first support plate relative to the vertical surface; and the rotating shaft of the section gear is positioned between the first support plate and the second support plate.

Optionally, the large-span mid-partition-free multi-arch tunnel milling and excavating construction equipment further comprises a hydraulic motor, the hydraulic motor is arranged in the first support and connected with the cutting tooth wheel, and the hydraulic motor is used for driving the cutting tooth wheel to rotate.

Optionally, the cutting gear comprises a wheel body and a plurality of rows of picks; each row of cutting picks comprises a plurality of cutting picks arranged at intervals along the circumference of the wheel body; the multiple rows of cutting teeth are arranged at intervals along the axial direction of the wheel body; and the two rows of cutting teeth positioned on the outermost side of the wheel body are obliquely arranged towards the outer side of the wheel body.

Optionally, the two rows of picks located outermost in the wheel body are at an angle in the range 0-30 ° to the vertical.

Optionally, the number of the cutting teeth is two, and the two cutting teeth are arranged on two sides of the mounting frame.

The large-span mid-partition-free multi-arch tunnel milling construction equipment provided by the embodiment of the invention has the beneficial effects that the equipment comprises the following components:

the milling and excavating construction equipment for the large-span diaphragm-free double-arch tunnel comprises an excavator forearm, a driving arm and a milling and excavating head; the small arm of the excavator is provided with a first connecting part, and the driving arm is provided with a second connecting part; the milling and digging head is provided with a third connecting part and a fourth connecting part, the third connecting part is detachably connected with the first connecting part, and the fourth connecting part is detachably connected with the second connecting part; the driving arm is used for driving the milling and digging head to rotate relative to the small arm of the excavator; the milling and digging head rotates relative to the small arm of the excavator within a preset angle range from the vertical plane, and the preset angle range is 0-90 degrees.

The milling and digging head can be directly assembled and connected with the small arm and the driving arm of the excavator, the excavator bucket and the milling and digging head can be flexibly selected and applied, the utilization rate of the machine body is obviously improved, and the maneuverability is strong; the tunnel excavation operation can be carried out by mounting the milling and excavating head after the excavator bucket is disassembled, the walking track, the chassis and the excavation big arm of the excavator do not need to be modified, the milling and excavating head can efficiently replace the excavator bucket, the breaking hammer and other configurations, the rock mass is cut through the milling and excavating head, and the rock mass is broken into slag. In addition, the milling and digging head can swing within 0-90 degrees relative to a vertical surface, dead-angle-free digging can be realized at different step heights, the digging size can meet the requirement of space lap joint of the arch centering at the multi-arch part, the disturbance to rock mass is small, the grooving speed is high, dangerous stones do not need to be cleaned manually, and the construction efficiency is obviously improved; compared with the traditional explosive blasting positioning, the positioning method is more accurate, the disturbance to the surrounding rock and the lining of the preceding tunnel is obviously reduced, the secondary damage rework is avoided to a limited extent, and no manual auxiliary operation is needed; the method has obvious advantages for excavating the multiple-arch part, and improves the efficiency of excavating the multiple-arch part of the multiple-arch tunnel.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a large-span mid-partition-free multi-arch tunnel milling construction device provided by an embodiment of the invention;

FIG. 2 is an enlarged view of a portion of FIG. 1;

fig. 3 is a schematic structural diagram of a first view angle of a milling and excavating head in the large-span mid-partition-free multi-arch tunnel milling and excavating construction equipment provided by the embodiment of the invention;

fig. 4 is a schematic structural diagram of a second view angle of the milling head in the large-span mid-partition-free multi-arch tunnel milling construction equipment provided by the embodiment of the invention.

Icon: 10-milling and excavating construction equipment for a large-span mid-partition-free multi-arch tunnel; 100-excavator forearm; 110-a drive arm; 200-milling and digging a head; 210-a mount; 211-a first connection plate; 212-a first mounting plate; 215-a second mounting plate; 213-first bolt; 214-a second bolt; 220-a connecting frame; 221-a second connecting plate; 222-a third connecting plate; 223-a support plate; 230-a mounting frame; 231-a first support; 232-a fourth connecting plate; 233-a second scaffold; 234-a first plate; 235-a second plate; 240-section gear; 241-wheel body; 242-picks; 300-a hydraulic motor; 400-hydraulic hose.

Detailed Description

In order to make the objects, 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 with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.

The milling construction equipment 10 for the large-span mid-partition-less multi-arch tunnel according to the present embodiment will be described in detail with reference to fig. 1 to 4.

Referring to fig. 1, the embodiment of the present invention provides a large-span mid-partition-free multi-arch tunnel milling construction device 10, and the embodiment of the present invention provides a large-span mid-partition-free multi-arch tunnel milling construction device 10, which includes an excavator forearm 100, a driving arm 110 and a milling head 200; the excavator boom 100 is provided with a first connection portion, and the driving arm 110 is provided with a second connection portion; the milling and digging head 200 is provided with a third connecting part and a fourth connecting part, the third connecting part is detachably connected with the first connecting part, and the fourth connecting part is detachably connected with the second connecting part; the driving arm 110 is used for driving the milling and digging head 200 to rotate relative to the small arm 100 of the excavator; the milling and excavating head 200 is rotated relative to the excavator forearm 100 within a predetermined angle from the vertical, the predetermined angle being in the range of 0-90 °.

The milling and excavating head 200 is detachably connected with the first connecting part and the second connecting part through the third connecting part and the fourth connecting part, respectively, so as to be detachably assembled with the excavator forearm 100. The milling and digging head 200 and the hydraulic excavator can replace the digging bucket and the milling and digging head 200, the tunnel excavation operation can be carried out by mounting the milling and digging head 200 after the digging bucket is disassembled, the walking crawler, the chassis and the excavation big arm of the digging machine do not need to be modified, the operation is simple, convenient and quick, multiple purposes can be realized, the use is economical, and the mechanical utilization rate is improved.

Referring to FIG. 2, the term "predetermined angle" as used herein refers to angle A, which is in the range of 0-90. Specifically, the preset angle is 45 °. The milling and digging head 200 can conveniently realize dead-angle-free digging at different step heights, the digging size can meet the requirement of space lap joint of the arch centering at the multi-arch part, the rock mass disturbance is small, the grooving speed is high, dangerous stones do not need to be cleaned manually, and the construction efficiency is obviously improved; compared with the traditional explosive blasting positioning, the positioning method is more accurate, the disturbance to the surrounding rock and the lining of the preceding tunnel is obviously reduced, the secondary damage rework is avoided to a limited extent, and no manual auxiliary operation is needed; the method has obvious advantages for excavating the multiple-arch part, and improves the efficiency of excavating the multiple-arch part of the multiple-arch tunnel. Improve current blasting and garrulous hammer excavation mode, avoid and weaken the excavation disturbance, the flexible operation, and do not need the hand labor power, can improve excavation operation quality, reduce construction safety risk. It can be seen that the milling and excavating machine formed by effectively connecting the milling and excavating head 200 and the small arm 100 of the hydraulic excavator plays an especially important role in excavating special parts and weak links in the long-span continuous arch tunnel without the intermediate wall.

Referring to fig. 2, in the present embodiment, the milling head 200 includes a mounting block 210, a mounting block 230, a cutting pick wheel 240, a first bolt 213, and a second bolt 214; the first connection part is a first pin hole provided in the excavator boom 100, and the second connection part is a second pin hole provided in the driving arm 110; the third connecting portion is a third pin hole disposed in the mounting seat 210, and the fourth connecting portion is a fourth pin hole disposed in the mounting seat 210; the third pin hole corresponds to the first pin hole and is fixedly connected through a first bolt 213, and the fourth pin hole corresponds to the second pin hole and is fixedly connected through a second bolt 214; a mounting block 230 is connected to the mounting block 210, and a cutting pick wheel 240 is provided on the mounting block 230.

The driving arm 110 drives the milling head 200 to rotate around the center of the second pin hole. The first bolt 213 and the second bolt 214 are used for realizing the disassembly and the assembly, and the disassembly and the assembly are convenient and quick. The cutting gear 240 is used to cut the rock mass during rotation.

Specifically, the mounting base 210 includes a first mounting plate 212 and a second mounting plate 215 that are disposed at an interval, where corresponding positions of the first mounting plate 212 and the second mounting plate 215 are both provided with a first pin hole, and corresponding positions of the first mounting plate 212 and the second mounting plate 215 are both provided with a second pin hole.

Referring to fig. 3, in the present embodiment, the milling and digging head 200 further includes a connecting frame 220; the mounting seat 210, the connecting frame 220 and the mounting frame 230 are connected in sequence. The connecting frame 220 is arranged between the mounting base 210 and the mounting frame 230, and the connecting frame 220 is used for increasing the overall length of the milling and digging head 200 so as to improve the flexibility of the milling and digging head 200 and improve the efficiency and the quality of excavation of the multi-arch part of the multi-arch tunnel.

Referring to fig. 3, in the present embodiment, the mount 210 is provided with a first connection plate 211; the connection frame 220 is provided with a second connection plate 221 and a third connection plate 222; the mounting bracket 230 is provided with a fourth connecting plate 232; first connecting plate 211, second connecting plate 221, third connecting plate 222 and fourth connecting plate 232 set gradually, and first connecting plate 211 and the laminating of second connecting plate 221 and fixed connection, third connecting plate 222 and the laminating of fourth connecting plate 232 and fixed connection.

The first connecting plate 211, the second connecting plate 221, the third connecting plate 222 and the fourth connecting plate 232 are sequentially arranged from top to bottom. The first connecting plate 211 is attached to the second connecting plate 221 and connected thereto by bolts, and the third connecting plate 222 is attached to the fourth connecting plate 232 and connected thereto by bolts.

Specifically, the first mounting plate 212 and the second mounting plate 215 are both provided on the first connection plate 211.

Specifically, the connection frame 220 further includes a plurality of support plates 223, and the plurality of support plates 223 are disposed at intervals between the second connection plate 221 and the third connection plate 222 and are used to connect the second connection plate 221 and the third connection plate 222.

Referring to fig. 3, in the present embodiment, the mounting frame 230 includes a first bracket 231 and a second bracket 233; the first bracket 231 is provided with a fourth connecting plate 232; the second bracket 233 is connected to one end of the first bracket 231, which is far away from the fourth connecting plate 232, and the second bracket 233 is arranged obliquely relative to the first bracket 231, so that the second bracket 233 is close to the front of construction relative to the first bracket 231 in the construction process; the pinion gear 240 is provided to the second holder 233.

The second holder 233 is obliquely arranged relative to the first holder 231, so that the cutting pick wheel 240 is closer to the construction front, the flexibility of the cutting pick wheel 240 is improved, the operable space of the cutting pick wheel 240 is enlarged, the cutting pick wheel 240 can carry out all-dimensional excavation operation, and the operation dead angle is avoided.

Referring to fig. 3, in the present embodiment, the second bracket 233 includes a first support plate 234 and a second support plate 235 arranged at intervals; the first support plate 234 and the second support plate 235 are both connected with the first bracket 231, and the second support plate 235 is far away from the construction front relative to the first support plate 234; the second support plate 235 is arranged obliquely relative to the first support plate 234, wherein the inclination angle of the second support plate 235 relative to the vertical plane is larger than the inclination angle of the first support plate 234 relative to the vertical plane; the axis of rotation of the cutoff gear 240 is located between the first plate 234 and the second plate 235.

The first and second brackets 234 and 235 are arranged in this order from left to right. The angle of inclination of the second plate 235 with respect to the vertical is angle B and the angle of inclination of the first plate 234 with respect to the vertical is angle C. Therefore, the cutting gear 240 is closer to the front of construction in the construction process, the construction range is larger, and the construction position is more accurate.

Referring to fig. 3, in the embodiment, the large-span diaphragm-free multi-arch tunnel milling and excavating construction equipment 10 further includes a hydraulic motor 300, the hydraulic motor 300 is disposed in the first bracket 231, the hydraulic motor 300 is connected with the cutting pick wheel 240, and the hydraulic motor 300 is used for driving the cutting pick wheel 240 to rotate.

The large-span mid-wall-free multi-arch tunnel milling and excavating construction equipment 10 further comprises an excavator hydraulic hose 400, the excavator hydraulic hose 400 is connected with the hydraulic motor 300, the excavator hydraulic hose 400 is used for conveying hydraulic oil to the hydraulic motor 300, and the hydraulic motor 300 is used for converting the hydraulic oil into mechanical energy and applying the mechanical energy to the cutting gear 240.

The excavator hydraulic hose 400 and the milling and digging head 200 can be directly used after being butted. The machine body forms mechanical energy during working, the mechanical energy is converted into hydraulic energy through the hydraulic plunger pump, the hydraulic energy is distributed to the execution elements (the hydraulic hose 400, the hydraulic motor 300 and the cutting tooth wheel 240) through the hydraulic system, the hydraulic energy is converted into the mechanical energy through the execution elements, the rotary operation of the cutting gear 240 is realized, and the drill bit continuously crushes rock masses to perform excavation.

Referring to fig. 4, in this embodiment, the pick wheel 240 includes a wheel body 241 and a plurality of rows of picks 242; each row of picks 242 includes a plurality of picks 242 spaced circumferentially along the wheel body 241; multiple rows of picks 242 are spaced axially along the wheel body 241; the two rows of picks 242 located outermost of the wheel body 241 are each arranged obliquely towards the outside of the wheel body 241.

Specifically, each cutting gear 240 is provided with three rows of picks 242, the three rows of picks 242 being spaced sequentially from left to right. Wherein the left-most pick 242 is disposed obliquely to the left with respect to the vertical plane, and the right-most pick 242 is disposed obliquely to the right with respect to the vertical plane. Such a cutting gear 240 can fully cut the rock body when cutting the rock body, also satisfies the size requirement of quick grooving simultaneously, and the direct collision contact with the rock body of the milling and digging head 200 will not be had for the rock body is loose, thereby multiplicable operation factor of safety.

Referring to fig. 4, in this embodiment, the two rows of picks 242 located outermost of the wheel body 241 are angled from the vertical in the range of 0-30 °. The two rows of picks 242 located outermost of the wheel body 241 are angled from the vertical at an angle D shown in figure 4, which is in the range 0-30 °.

Referring to fig. 4, in the present embodiment, the number of the cutting pick wheels 240 is two, and two cutting pick wheels 240 are provided on both sides of the mounting block 230. The mounting bracket 230 is used for mounting the hydraulic motor 300 and the hydraulic hose 400, and the mounting of the two cutting gears 240 does not affect the upper structure of the mounting bracket 230.

The large-span mid-partition-free multi-arch tunnel milling and excavating construction equipment 10 provided by the embodiment at least has the following advantages:

after the bucket of the hydraulic excavator is disassembled, the milling and digging head 200 is installed on the small arm 100 of the excavator, so that the multifunctional excavator is multifunctional, and the utilization rate of the machine is improved. And then, the milling and digging head 200 is used for excavating the multi-arch part of the multi-arch tunnel, compared with the traditional blasting mode, the milling and digging head 200 can realize 0-90-degree rotation relative to the vertical surface relative to the small arm 100 of the excavator, so that dead-angle-free excavation can be realized at different step heights, the excavating size can meet the requirement of space lap joint of the arch centering of the multi-arch part, the rock mass disturbance is small, the grooving speed is high, dangerous rocks do not need to be manually cleaned, and the construction efficiency is obviously improved.

The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (10)

1. The utility model provides a large-span does not have mid-board double arch tunnel and mills construction equipment that digs which characterized in that includes:

the excavator comprises an excavator small arm (100), a driving arm (110) and a milling and digging head (200);

the excavator small arm (100) is provided with a first connecting part, and the driving arm (110) is provided with a second connecting part; the milling and digging head (200) is provided with a third connecting part and a fourth connecting part, the third connecting part is detachably connected with the first connecting part, and the fourth connecting part is detachably connected with the second connecting part; the driving arm (110) is used for driving the milling and digging head (200) to rotate relative to the small arm (100) of the excavator;

the milling and digging head (200) rotates relative to the small arm (100) of the excavator within a range of a preset angle with the vertical plane, and the range of the preset angle is 0-90 degrees.

2. The large-span mid-partition-free multi-arch tunnel milling construction equipment as claimed in claim 1, wherein:

the milling and excavating head (200) comprises a mounting base (210), a mounting frame (230), a cutting pick wheel (240), a first bolt (213) and a second bolt (214); the first connecting part is a first pin hole arranged on the excavator small arm (100), and the second connecting part is a second pin hole arranged on the driving arm (110); the third connecting part is a third pin hole arranged in the mounting seat (210), and the fourth connecting part is a fourth pin hole arranged in the mounting seat (210); the third pin hole corresponds to the first pin hole and is fixedly connected through the first bolt (213), and the fourth pin hole corresponds to the second pin hole and is fixedly connected through the second bolt (214);

the mounting frame (230) is connected with the mounting seat (210), and the cutting gear (240) is arranged on the mounting frame (230).

3. The large-span mid-wall-free multi-arch tunnel milling construction equipment as claimed in claim 2, wherein:

the milling and digging head (200) further comprises a connecting frame (220); the mounting seat (210), the connecting frame (220) and the mounting frame (230) are connected in sequence.

4. The large-span mid-wall-free multi-arch tunnel milling construction equipment as claimed in claim 3, wherein:

the mounting seat (210) is provided with a first connecting plate (211); the connecting frame (220) is provided with a second connecting plate (221) and a third connecting plate (222); the mounting frame (230) is provided with a fourth connecting plate (232); the first connecting plate (211), the second connecting plate (221), the third connecting plate (222) and the fourth connecting plate (232) are sequentially arranged, the first connecting plate (211) is attached to and fixedly connected with the second connecting plate (221), and the third connecting plate (222) is attached to and fixedly connected with the fourth connecting plate (232).

5. The large-span mid-wall-free multi-arch tunnel milling construction equipment as claimed in claim 4, wherein:

the mounting frame (230) comprises a first bracket (231) and a second bracket (233); the first bracket (231) is provided with the fourth connecting plate (232); the second bracket (233) is connected to one end, away from the fourth connecting plate (232), of the first bracket (231), and the second bracket (233) is obliquely arranged relative to the first bracket (231) so that the second bracket (233) is close to the front of construction relative to the first bracket (231) in the construction process; the cutting gear (240) is provided to the second bracket (233).

6. The large-span mid-wall-free multi-arch tunnel milling construction equipment as claimed in claim 5, wherein:

the second bracket (233) comprises a first support plate (234) and a second support plate (235) which are arranged at intervals; the first support plate (234) and the second support plate (235) are connected with the first bracket (231), and the second support plate (235) is far away from the construction front relative to the first support plate (234); the second support plate (235) is obliquely arranged relative to the first support plate (234), wherein the inclination angle of the second support plate (235) relative to the vertical plane is larger than the inclination angle of the first support plate (234) relative to the vertical plane; the rotating shaft of the section gear (240) is positioned between the first support plate (234) and the second support plate (235).

7. The large-span mid-wall-free multi-arch tunnel milling construction equipment as claimed in claim 5, wherein:

the large-span mid-partition-free multi-arch tunnel milling and excavating construction equipment further comprises a hydraulic motor (300), wherein the hydraulic motor (300) is arranged in the first support (231), the hydraulic motor (300) is connected with the cutting gear (240), and the hydraulic motor (300) is used for driving the cutting gear (240) to rotate.

8. The milling construction equipment for the large-span mid-wall-free multi-arch tunnel according to any one of claims 2 to 7, wherein:

the section gear (240) including a wheel body (241) and a plurality of rows of picks (242); each row of the picks (242) includes a plurality of picks (242) spaced circumferentially along the wheel body (241); the rows of picks (242) being spaced axially along the wheel body (241); the two rows of cutting picks (242) located on the outermost side of the wheel body (241) are arranged obliquely towards the outside of the wheel body (241).

9. The large-span mid-wall-free multi-arch tunnel milling construction equipment as claimed in claim 8, wherein:

the two rows of cutting picks (242) located on the outermost side of the wheel body (241) form an included angle with the vertical plane in the range of 0-30 degrees.

10. The large-span mid-partition-free multi-arch tunnel milling construction equipment as claimed in claim 9, wherein:

the number of the section gears (240) is two, and the two section gears (240) are arranged on two sides of the mounting rack (230).

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