A tunnel excavation construction device and method

Abstract

The present invention discloses a tunnel excavation construction device, including a drilling jumbo. A sector-shaped drilling mechanism is rotatably installed at the front end of the drilling jumbo. The sector-shaped drilling mechanism includes a rotating frame with a sector shape and a rotating motor. A drilling unit is provided on the rotating frame. A rotating main shaft is arranged on the drilling jumbo. The rotating motor drives the sector-shaped drilling mechanism to rotate through a reducer for drilling operations on different sector-shaped drilling areas of the tunnel face. At the same time, a tunnel excavation construction method is disclosed. Through the tunnel excavation construction device and method provided by the present invention, the problem in the prior art that when the drill-and-blast method is used for tunnel excavation, effective support cannot be provided in time, and due to the large tunnel blasting surface, there is a safety hazard of tunnel collapse before effective support is completed is solved. Through sectional excavation and temporary support, the safety of tunnel construction is ensured, and at the same time, the construction efficiency is improved, which is applicable to the technical field of tunnel construction.

Description

Technical Field

[0001] The present invention belongs to the technical field of tunnel construction. Specifically, it relates to a tunnel excavation construction device and method. Background Technique

[0002] Tunnels are key projects in the construction of highways, railways, etc. With the development of railway construction and the progress of technology, tunnel excavation methods have developed rapidly. Commonly used excavation methods include the drill and blast method, the shield method, and the tunneling machine method. Since the drill and blast method has strong adaptability to geological conditions and low excavation costs, and is especially suitable for the construction of hard rock tunnels, broken rock tunnels, and a large number of short tunnels, the drill and blast method is still the commonly used tunnel excavation method at home and abroad at present.

[0003] However, the drill and blast method usually uses manual drilling or a modified excavation drill to drill holes and then blast. No matter which method is used, effective support can only be carried out through the arch frame after the crushed stones are cleared. Due to the large blasting surface, there is a potential safety hazard of tunnel collapse before effective support is completed. Summary of the Invention

[0004] The present invention provides a tunnel excavation construction device and method, which are used to solve the problem that when the drill and blast method is used for tunnel excavation in the prior art, effective support cannot be carried out in time, and due to the large tunnel blasting surface, there is a potential safety hazard of tunnel collapse before effective support is completed.

[0005] To achieve the above object, the technical solutions adopted by the present invention are as follows:

[0006] A tunnel excavation construction device includes a drilling jumbo. A fan-shaped drilling mechanism is rotatably installed at the front end of the drilling jumbo. The fan-shaped drilling mechanism includes a rotating frame with a fan-shaped structure and a rotating motor. A drilling unit is provided on the rotating frame. A rotating main shaft is arranged on the drilling jumbo. The rotating motor drives the fan-shaped drilling mechanism to rotate through a speed reducer to perform drilling operations on different fan-shaped drilling areas of the tunnel face.

[0007] Further, the drilling unit includes a blasting drilling unit and a non-blasting drilling unit. The non-blasting drilling unit is located at the edge position of the rotating frame, and the blasting drilling unit is located at the middle position.

[0008] Further, the non-blasting drilling unit includes a first drilling unit, a second drilling unit, and a third drilling unit. The first drilling unit is installed on one side of the rotating frame through a first walking mechanism, the second drilling unit is installed on the other side of the rotating frame through a second walking mechanism, and the third drilling unit is installed in the arc-shaped edge area of the rotating frame through a first arc walking mechanism.

[0009] Further, the first drilling unit, the second drilling unit, and the third drilling unit each include a drilling rig. First installation grooves, second installation grooves, and third installation grooves for the corresponding traveling mechanisms and the installation of the drilling rigs are respectively formed on both sides and the arc-shaped edge positions of the rotating frame. Each traveling mechanism is connected to the drilling rig through a connecting rod passing through the installation groove, and a drill pipe is installed on the drilling rig.

[0010] Further, the blasting drilling unit includes a swing arm and a drilling rig. One end of the swing arm is rotatably installed at the central position of the rotating frame, and the other end is installed in the inner area of the arc-shaped edge of the rotating frame through a second arc-shaped traveling mechanism. The drilling rig is installed on the swing arm through a fourth traveling mechanism. A fourth installation groove for the installation of the fourth traveling mechanism and the drilling rig is formed on the swing arm. The fourth traveling mechanism is connected to the drilling rig through a connecting rod, and a drill pipe is installed on the drilling rig.

[0011] Further, the drilling jumbo includes a crawler traveling mechanism and a jumbo body. A bow-shaped frame is provided at the top of the jumbo body. The front end of the bow-shaped frame is connected to the rotating frame through a support rod. One end of the support rod is fixedly connected to the rotating frame, and the other end is movably connected to the bow-shaped frame through a roller. A wheel groove adapted to the roller is formed at the front end of the bow-shaped frame.

[0012] The present invention also discloses a tunnel excavation construction method, which includes the following steps:

[0013] S1: Divide the area, divide the tunnel face into two fan-shaped areas A and B with the same area;

[0014] S2: Determine the blasting position, determine the middle area of area A as the blasting position and the edge as the non-blasting position, and determine the position distribution of the blasting holes in the blasting position and the drilling holes in the non-blasting position. The hole spacing in the non-blasting position is dense, and the hole spacing in the blasting area is relatively sparse;

[0015] S3: Drill holes in area A, perform drilling operations on the blasting holes and drilling holes in area A through the fan-shaped drilling mechanism, and determine the hole diameter and hole depth according to the rock formation structure;

[0016] S4: Blast area A, install explosives and delay detonator detonators in the blasting holes, and perform delay blasting in the order of first the middle and then the periphery. The amount of explosives is determined according to the rock formation structure;

[0017] S5: Clean the crushed stones, use cleaning equipment to remove the blasted crushed stones in area A, and trim the tunnel shape. Before cleaning, ventilate to disperse the gun smoke and spray for dust removal;

[0018] S6: Support with arch frames, use the first arch frame, the arc-shaped connecting frame, and the support structure of several assembled arch frames to temporarily support the blasted area A, and then lock and fix the assembled arch frames to the tunnel wall of area A through the anchor bolts inserted into the tunnel wall;

[0019] S7: Repeat the above steps S2 - S5 to perform blasting operations on area B. Connect and fix the second arch frames of several assembled arch frames to the corresponding first arch frames through connecting frames to support the entire tunnel. Lock and fix the second arch frames to the tunnel wall in area B through anchor bolts inserted into the tunnel wall. Then, remove the support structure and switch the drilling operations between area A and area B through the fan - shaped drilling mechanism;

[0020] S8: Cement spraying. Use spraying equipment to perform cement spraying treatment on the supported tunnel wall. After the cement solidifies, repeat steps S1 - S7.

[0021] Furthermore, the assembled arch frame includes a first arch frame, a second arch frame, and an arc - shaped connecting frame. The first arch frame and the second arch frame are fixedly connected through the connecting frame, and all three are fixed to the tunnel wall through anchor bolts. The end of the connecting frame is provided with two connecting plates, and a connecting sleeve is provided in the middle. The top ends of the first arch frame and the second arch frame are provided with connecting sleeves, and connecting sleeves are provided on the frames of both arch frames. The distance between the two connecting sleeves on each arch frame is the same as the arc length of the connecting frame. When connecting, the connecting sleeves at the top ends of the two arch frames are located between the two connecting plates at the end of the connecting frame and are locked and fixed through bolts. Several assembled arch frames are evenly arranged along the depth direction of the tunnel, and the bottom ends of several first arch frames and second arch frames are connected and fixed through a bottom beam. The frames of the arch frames and several connecting frames are connected and fixed through strengthening screw rods.

[0022] Furthermore, the support structure for the temporary support in S6 includes a base, a longitudinal beam, and several columns arranged along the depth direction of the tunnel. The base and the longitudinal beam are fixedly connected through several columns. The longitudinal beam is provided with several groups of connecting ears adapted to the connecting sleeves. When the support structure supports area A, one end of the connecting frame is fixedly connected to the connecting sleeve at the top end of the first arch frame, and the other end is fixedly connected to the connecting sleeve on the frame of the first arch frame. The connecting sleeve in the middle of the connecting frame is located between each group of connecting ears and is fixedly connected through bolts.

[0023] Furthermore, when performing the overall support of the tunnel in S7, remove the connecting sleeve and the connecting ear on the connecting frame at the middle position of the longitudinal beam, so that the connecting frame changes from the folded state on the first arch frame to the unfolded state and is fixedly connected to the second arch frame. Then, remove and install the connecting frames at both ends, and the removal sequence is from the middle to both ends.

[0024] Due to the adoption of the above - mentioned construction device and method, compared with the prior art, the technical progress achieved by the present invention is as follows:

[0025] (1) Divide the tunnel heading face into two areas, area A and area B, and perform blasting one by one. Compared with the full - scale blasting in the traditional technology, the blasting area is small, which reduces the probability of tunnel collapse to a certain extent. At the same time, timely and effective temporary support is provided for the tunnel wall, further ensuring the stability of the tunnel wall;

[0026] (2) Determine that the edge positions of each area are non-blasting positions, the non-blasting holes are dense, and the middle is the blasting position where the blasting holes are sparse. During the blasting process at the blasting position, on the one hand, the dense blasting holes contribute to the fragmentation of the rock, and on the other hand, they can reduce the impact force of the blasting on the tunnel wall, playing an isolation role, increasing the safety factor, and preventing the tunnel from collapsing;

[0027] (3) Use a fan-shaped drilling mechanism to drill holes at multiple positions on the face of the working area simultaneously, with high working efficiency. Moreover, the fan-shaped drilling mechanism can be driven by a rotating motor to switch between Area A and Area B, with high flexibility;

[0028] In summary, the tunnel excavation construction device and method provided by the present invention solve the problem that when the drill-and-blast method is used for tunnel excavation in the prior art, effective support cannot be carried out in a timely manner. Due to the large blasting surface of the tunnel, there is a safety hazard of tunnel collapse before effective support is completed. Through sectional excavation and temporary support, the safety of tunnel construction is ensured, and at the same time, the construction efficiency is improved, which is applicable to the technical field of tunnel construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.

[0030] In the drawings:

[0031] Figure 1 is a step diagram of a tunnel excavation construction method provided by the present invention;

[0032] Figure 2 is a distribution diagram of the face division, blasting holes and drill holes of the tunnel in the embodiment of the present invention;

[0033] Figure 3 is a working schematic diagram of the fan-shaped drilling mechanism in the embodiment of the present invention;

[0034] Figure 4 is a three-dimensional structure schematic diagram of the fan-shaped drilling mechanism in the embodiment of the present invention;

[0035] Figure 5 is a front view of the fan-shaped drilling mechanism in the embodiment of the present invention;

[0036] Figure 6 is a side view of the fan-shaped drilling mechanism in the embodiment of the present invention;

[0037] Figure 7 is a structure schematic diagram of the assembled arch support for tunnel support in the embodiment of the present invention;

[0038] Figure 8Schematic structural diagram of the assembled arch frame in the embodiment of the present invention;

[0039] Figure 9 It is Figure 8 Partial enlarged view of area A in

[0040] Figure 10 Schematic three-dimensional structure diagram of the connection between the support structure and the first arch frame in the embodiment of the present invention;

[0041] Figure 11 Front view of the connection between the support structure and the first arch frame in the embodiment of the present invention;

[0042] Figure 12 It is Figure 11 Partial enlarged view of area B in

[0043] Figure 13 Schematic structural diagram of the support structure in the embodiment of the present invention;

[0044] Figure 14 Schematic structural diagram of the connection in the embodiment of the present invention;

[0045] Figure 15 Schematic structural diagram of the connection in the embodiment of the present invention;

[0046] Figure 16 Schematic structural diagram of the connecting frame in the embodiment of the present invention.

[0047] Labeled components: 1 - tunnel wall, 11 - non-blasting hole, 12 - blasting hole, 01 - Area A, 02 - Area B, 2 - drilling jumbo, 20 - jumbo body, 21 - crawler travel mechanism, 22 - bow-shaped frame, 221 - wheel groove, 3 - fan-shaped drilling mechanism, 30 - rotating frame, 301 - third installation groove, 302 - first installation groove, 303 - second installation groove, 31 - third drilling unit, 311 - first arc walking mechanism, 32 - first drilling unit, 321 - drill pipe, 33 - second drilling unit, 34 - swing arm, 35 - rotating motor, 36 - support rod, 37 - rotating main shaft, 340 - fourth installation groove, 341 - second arc walking mechanism, 342 - blasting drilling unit, 4 - assembled arch frame, 40 - bottom beam, 41 - first arch frame, 42 - strengthening screw, 420 - connecting sleeve, 43 - connecting frame, 431 - connecting plate, 44 - second arch frame, 45 - connecting sleeve, 46 - bolt, 5 - support structure, 50 - base, 500 - end plate, 51 - column, 52 - longitudinal beam, 521 - connecting ear. Detailed implementation manners

[0048] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustration and explanation of the present invention, and are not intended to limit the present invention.

[0049] The present invention discloses a tunnel excavation construction device, as Figure 3 shown, which includes a drilling jumbo 2. A sector drilling mechanism 3 is rotatably installed at the front end of the drilling jumbo 2. The sector drilling mechanism 3 includes a rotating frame 30 with a sector structure and a rotating motor 35. A drilling unit is provided on the rotating frame 30. A rotating main shaft 37 is arranged on the drilling jumbo 2. The rotating motor 35 drives the sector drilling mechanism 3 to rotate through a speed reducer for drilling operations on different sector drilling areas of the tunnel face.

[0050] The sector drilling mechanism 3 is used to drill holes at multiple positions on the face of the working area simultaneously, with relatively high working efficiency. Moreover, the sector drilling mechanism 3 can be driven by the rotating motor 35 to switch between area A 01 and area B 02, with relatively high flexibility. When the blasting in area A 01 is completed and the sector drilling mechanism 3 is switched to area B 02 for drilling operations, the gravel in area A 01 can be cleared simultaneously, and the two will not interfere with each other, resulting in relatively high construction efficiency.

[0051] As a preferred embodiment, as Figure 4 、 Figure 6 shown, the drilling jumbo 2 includes a crawler traveling mechanism 21 and a jumbo body 20. An arch-shaped frame 22 is provided at the top of the jumbo body 20. The front end of the arch-shaped frame 22 is connected to the rotating frame 30 through a support rod 36. One end of the support rod 36 is fixedly connected to the rotating frame 30, and the other end is movably connected to the arch-shaped frame 22 through a roller. A wheel groove 221 adapted to the roller is provided at the front end of the arch-shaped frame 22.

[0052] By adopting the crawler traveling mechanism 21, it can travel in a relatively harsh environment in the tunnel and is less affected by the road surface quality. The setting of the support rod 36 improves the stability during drilling while realizing the flexibility of the rotating frame 30.

[0053] As a preferred embodiment, as Figure 5 shown, the drilling unit includes a blasting drilling unit 342 and a non-blasting drilling unit 342. The non-blasting drilling unit 342 is located at the edge position of the rotating frame 30, and the blasting drilling unit 342 is located at the middle position.

[0054] The non-blasting drilling unit 342 includes a first drilling unit 32, a second drilling unit 33 and a third drilling unit 31. The first drilling unit 32 is installed on one side of the rotary frame 30 through a first traveling mechanism, the second drilling unit 33 is installed on the other side of the rotary frame 30 through a second traveling mechanism, and the third drilling unit 31 is installed on the arc-shaped edge area of the rotary frame 30 through a first arc traveling mechanism 311. The first drilling unit 32, the second drilling unit 33 and the third drilling unit 31 all include drilling rigs. First installation grooves 302, second installation grooves 303 and third installation grooves 301 for the corresponding traveling mechanisms and the installation of the drilling rigs are respectively formed on both sides and the arc-shaped edge position of the rotary frame 30. Each traveling mechanism is connected to the drilling rig through a connecting rod passing through the installation groove, and a drill pipe 321 is installed on the drilling rig. The blasting drilling unit 342 includes a swing arm 34 and a drilling rig. One end of the swing arm 34 is rotatably installed at the central position of the rotary frame 30, and the other end is installed on the inner side area of the arc-shaped edge of the rotary frame 30 through a second arc traveling mechanism 341. The drilling rig is installed on the swing arm 34 through a fourth traveling mechanism. A fourth installation groove 340 for the installation of the fourth traveling mechanism and the drilling rig is formed on the swing arm 34. The fourth traveling mechanism is connected to the drilling rig through a connecting rod, and a drill pipe 321 is installed on the drilling rig. By moving along the rotary frame 30 through the fourth arc traveling mechanism, the swing arm 34 rotates around the rotary main shaft 37. At the same time, in cooperation with the movement of the fourth traveling mechanism, the position of the blasting drilling can be flexibly adjusted to realize the drilling operation at different positions.

[0055] For the first traveling mechanism and the second traveling mechanism, a gear-rack transmission or a hydraulic cylinder transmission can be adopted, or a chain transmission can also be adopted. The first arc traveling mechanism 311 and the second arc traveling mechanism 341 can adopt a gear and an arc-shaped rack transmission, and can be selected according to needs. By arranging the corresponding traveling mechanisms at different positions such as the edge and the middle of the fan-shaped frame, the drilling rigs at different positions can work simultaneously without interference. Compared with the traditional technology of drilling one by one by manual or drilling rig, the present invention realizes comprehensive drilling and improves the work efficiency.

[0056] The present invention also discloses a tunnel excavation construction method, as Figure 1 shown, which includes the following steps:

[0057] S1: Divide the area, as Figure 2 shown, divide the tunnel face into two fan-shaped areas, area A 01 and area B 02, with the same area;

[0058] S2: Determine the blasting position. As shown in the figure, determine the middle area of area A 01 as the blasting position and the edge as the non-blasting position, and determine the position distribution of the blasting holes 12 at the blasting position and the drilling holes at the non-blasting position. The hole spacing at the non-blasting position is dense, and the hole spacing in the blasting area is relatively sparse;

[0059] In the present invention, short-hole blasting is adopted for blasting; the tunnel face is divided into two areas, namely area A 01 and area B 02, and blasting is carried out one by one. Compared with the full-face blasting in the traditional technology, the blasting area is small, which reduces the probability of tunnel collapse to a certain extent. The edge positions of each area are determined as non-blasting positions, where the non-blasting holes 11 are dense, and the middle is the blasting position where the blasting holes 12 are sparse. During the blasting process at the blasting position, on the one hand, the dense blasting holes 12 contribute to the fragmentation of the rock, and on the other hand, they can reduce the impact force of the blasting on the tunnel wall, playing an isolating role and improving the safety factor, thus preventing tunnel collapse.

[0060] S3: Drilling holes in area A 01. The blasting holes 12 and drill holes in area A 01 are drilled through the fan-shaped drilling mechanism 3, and the hole diameter and hole depth are determined according to the rock formation structure.

[0061] S4: Blasting in area A 01. Explosives and delay detonator detonators are installed in the blasting holes 12, and delay blasting is carried out in the order of first the middle and then the periphery. The amount of explosives is determined according to the rock formation structure.

[0062] S5: Debris cleaning. The debris after blasting in area A 01 is removed through the cleaning equipment, and the shape of the tunnel is trimmed. Before cleaning, the gun smoke is dispersed by ventilation and dust is removed by spraying.

[0063] S6: Arch support, as Figures 10 - 12 shown, the blasted area A 01 is temporarily supported by the first arch 41 of several assembled arches 4, the arc-shaped connecting frame 43 and the support structure 5. Then, the assembled arch 4 is locked and fixed on the tunnel wall 1 of area A 01 through the anchor bolts inserted into the tunnel wall 1; as Figure 13 shown, the support structure 5 for temporary support in S6 includes a base 50, a longitudinal beam 52 and several columns 51 arranged along the tunnel depth direction. The base 50 and the longitudinal beam 52 are fixedly connected through several columns 51. Several groups of connecting ears 521 adapted to the connecting sleeve 45432 are provided on the longitudinal beam 52. When the support structure 5 supports area A 01, one end of the connecting frame 43 is fixedly connected to the connecting sleeve 45432 at the top of the first arch 41, and the other end is fixedly connected to the connecting sleeve 45432 on the frame body of the first arch 41. The connecting sleeve 45432 in the middle of the connecting frame 43 is located between each group of connecting ears 521 and is fixedly connected through bolts 46. The first arch 41, the second arch 44 and the connecting arch are all formed by bending multiple steel bars and then welding them. The cross-section of each arch is square, and it is formed by welding four steel bars through stirrups and reinforcing bars, and is an arc-shaped three-dimensional structure. The end of the bottom beam 40 is provided with an end plate 500, and the end plates 500 between adjacent bottom beams 40 are connected and fixed through bolts 46. As Figures 14 - 15 shown, adjacent reinforcing screws 42 are connected and fixed through a connecting sleeve 420 and a lock nut.

[0064] Timely and effective temporary support for the tunnel wall 1 further ensures the stability of the tunnel wall 1, and is safer than full-face blasting in traditional technologies;

[0065] S7: Repeat the above steps S2 - S5 to carry out blasting operations in area B02. Connect and fix the second arch frames 44 of several assembled arch frames 4 to the corresponding first arch frames 41 through connecting frames 43 to support the whole tunnel. Lock and fix the second arch frames 44 on the tunnel wall 1 in area B02 through anchor bolts inserted into the tunnel wall 1. Then remove the support structure 5 and switch the drilling operations in area A01 and area B02 through the fan-shaped drilling mechanism 3. When supporting the whole tunnel, remove the connecting sleeve 45432 and the connecting ear 521 on the connecting frame 43 at the middle position of the longitudinal beam 52, so that the connecting frame 43 changes from the folded state on the first arch frame 41 to the unfolded state and is fixedly connected to the second arch frame 44. Then remove and install the connecting frames 43 at both ends, and the removal sequence is from the middle to both ends. Supporting from the middle to both ends can first support the whole tunnel wall 1 and then carry out local precise support, preventing the reverse wall from collapsing during the construction in the order of one-way support, and its reliability is higher.

[0066] S8: Cement spraying. Carry out cement spraying treatment on the supported tunnel wall 1 through spraying equipment, and repeat steps S1 - S7 after the cement solidifies.

[0067] As a preferred embodiment, as Figure 8 shown, the assembled arch frame 4 includes a first arch frame 41, a second arch frame 44 and an arc-shaped connecting frame 43. The first arch frame 41 and the second arch frame 44 are fixedly connected through the connecting frame 43, and all three are fixed to the tunnel wall 1 through anchor bolts. As Figure 16 shown, two connecting plates 431 are provided at the end of the connecting frame 43, and a connecting sleeve 45432 is provided in the middle. Connecting sleeves 45432 are provided at the tops of the first arch frame 41 and the second arch frame 44, and connecting sleeves 45432 are provided on the frames of both arch frames. The distance between the two connecting sleeves 45432 on each arch frame is the same as the arc length of the connecting frame 43. When connecting, as Figure 9As shown in the figure, the connecting sleeve 45432 at the top of the two arch frames is located between the two connecting plates 431 at the end of the connecting frame 43 and is locked and fixed by bolts 46. A number of assembled arch frames 4 are evenly arranged along the tunnel depth direction, and the bottom ends of a number of first arch frames 41 and second arch frames 44 are connected and fixed by a bottom beam 40. The frame body of the arch frame and a number of connecting frames 43 are connected and fixed by strengthening screw rods 42. The strengthening screw rods 42 connect the connecting sleeves 45432 on each arch frame body, making each assembled arch frame 4 form a stable whole, and supporting the tunnel wall 1 more firmly. This assembled arch frame 4 is a split structure, which is convenient for processing and transportation, and does not require welding operations during later construction. It can be assembled through bolts 46, which is convenient for construction. At the same time, the connecting frame 43 has a dual function. In the folded state, it can connect the first arch frame 41, the column 51, the longitudinal beam 52 and the bottom beam 40 to form a stable whole to temporarily support the tunnel wall 1. In the unfolded state, as Figure 7 shown in the figure, the first arch frame 41 and the second arch frame 44 can be permanently connected, and cooperate with anchor bolts to achieve permanent stable support for the tunnel wall 1.

[0068] In summary, the tunnel excavation construction device and method provided by the present invention solve the problem that in the prior art, when tunneling by the drill and blast method, effective support cannot be carried out in time. Due to the large tunnel blasting surface, there is a safety hazard of tunnel collapse before effective support is completed. Through sectional excavation, the temporary support ensures the safety of tunnel construction and improves the construction efficiency at the same time, and is applicable to the technical field of tunnel construction.

Claims

1. A tunnel excavation construction device, comprising a drilling jumbo, characterized in that: A sector drilling mechanism is rotatably installed at the front end of the jumbo. The sector drilling mechanism includes a rotary frame in the shape of a sector and a rotary motor. A drilling unit is provided on the rotary frame. A rotary main shaft is arranged on the jumbo. The rotary motor drives the sector drilling mechanism to rotate through a speed reducer for drilling operations on different sector drilling areas of the tunnel face; The drilling unit includes a blasting drilling unit and a non-blasting drilling unit. The non-blasting drilling unit is located at the edge position of the rotary frame, and the blasting drilling unit is located in the middle position; The non-blasting drilling unit includes a first drilling unit, a second drilling unit, and a third drilling unit. The first drilling unit is installed on one side of the rotary frame through a first walking mechanism, the second drilling unit is installed on the other side of the rotary frame through a second walking mechanism, and the third drilling unit is installed in the arc-shaped edge area of the rotary frame through a first arc walking mechanism; The first drilling unit, the second drilling unit, and the third drilling unit all include a drill rig. First installation grooves, second installation grooves, and third installation grooves for the corresponding walking mechanisms and drill rig installations are respectively opened on both sides and the arc-shaped edge position of the rotary frame. Each walking mechanism is connected to the drill rig through a connecting rod passing through the installation groove, and a drill pipe is installed on the drill rig; The blasting drilling unit includes a swing arm and a drill rig. One end of the swing arm is rotatably installed at the central position of the rotary frame, and the other end is installed in the inner area of the arc-shaped edge of the rotary frame through a second arc walking mechanism. The drill rig is installed on the swing arm through a fourth walking mechanism. A fourth installation groove for the fourth walking mechanism and drill rig installation is opened on the swing arm. The fourth walking mechanism is connected to the drill rig through a connecting rod, and a drill pipe is installed on the drill rig; The jumbo includes a crawler walking mechanism and a jumbo body. A bow-shaped frame is provided at the top of the jumbo body. The front end of the bow-shaped frame is connected to the rotary frame through a support rod. One end of the support rod is fixedly connected to the rotary frame, and the other end is movably connected to the bow-shaped frame through a roller. A wheel groove adapted to the roller is opened at the front end of the bow-shaped frame.

2. A construction method of the tunnel excavation construction device according to claim 1, characterized in that: It includes the following steps: S1: Divide the area. Divide the tunnel face into two sector areas, area A and area B, with the same area; S2: Determine the blasting position. Determine the middle area of area A as the blasting position and the edge as the non-blasting position, and determine the position distribution of the blasting holes at the blasting position and the drilling holes at the non-blasting position. The hole spacing at the non-blasting position is dense, and the hole spacing in the blasting area is relatively sparse; S3: Drill holes in area A. Use the sector drilling mechanism to drill the blasting holes and drilling holes in area A, and determine the hole diameter and hole depth according to the rock formation structure; S4: Blast area A. Install explosives and delay detonator detonators in the blasting holes, and conduct delay blasting in the order of first the middle and then the surrounding. The amount of explosives used is determined according to the rock formation structure; S5: Clean the crushed stones. Use cleaning equipment to remove the crushed stones after blasting in area A and trim the shape of the tunnel. Ventilate and blow away the gun smoke and spray dust before cleaning; S6: Arch support. The blasted area A is temporarily supported by the first arch of several assembled arches, the arc-shaped connecting frame and the support structure. Then, the assembled arch is locked and fixed to the tunnel wall of area A by inserting anchor bolts into the tunnel wall. S7: Repeat the above steps S2 - S5 for blasting operation in area B. Connect and fix the second arch of several assembled arches to the corresponding first arches through the connecting frame to support the whole tunnel. Insert anchor bolts into the tunnel wall to lock and fix the second arch to the tunnel wall of area B. Then remove the support structure and switch the drilling operation between area A and area B through the fan-shaped drilling mechanism. S8: Cement spraying. The supported tunnel wall is treated with cement spraying by spraying equipment. After the cement solidifies, repeat steps S1 - S7.

3. The construction method according to claim 2, wherein: The assembled arch includes a first arch, a second arch and an arc-shaped connecting frame. The first arch and the second arch are fixedly connected through the connecting frame, and all three are fixed to the tunnel wall by anchor bolts. The end of the connecting frame is provided with two connecting plates, and a connecting sleeve is arranged in the middle. The top ends of the first arch and the second arch are provided with connecting sleeves, and connecting sleeves are arranged on the frames of both arches. The distance between the two connecting sleeves on each arch is the same as the arc length of the connecting frame. When connecting, the connecting sleeves at the top ends of the two arches are located between the two connecting plates at the end of the connecting frame and are locked and fixed by bolts. Several assembled arches are evenly arranged along the depth direction of the tunnel, and the bottom ends of several first arches and second arches are connected and fixed by a bottom beam. The frame of the arch and several connecting frames are connected and fixed by strengthening screws.

4. The construction method according to claim 3, characterized in that: The support structure for the temporary support in S6 includes a base, a longitudinal beam and several columns arranged along the depth direction of the tunnel. The base and the longitudinal beam are fixedly connected by several columns. Several groups of connecting ears adapted to the connecting sleeves are arranged on the longitudinal beam. When the support structure supports area A, one end of the connecting frame is fixedly connected to the connecting sleeve at the top end of the first arch, and the other end is fixedly connected to the connecting sleeve on the frame of the first arch. The connecting sleeve in the middle of the connecting frame is located between each group of connecting ears and is fixedly connected by bolts.

5. The construction method according to claim 4, characterized in that: When the whole tunnel is supported in S7, remove the connecting sleeve and the connecting ear on the connecting frame at the middle position of the longitudinal beam, so that the connecting frame changes from the folded state on the first arch to the unfolded state and is fixedly connected to the second arch. Then remove and install the connecting frames at both ends, and the removal sequence is from the middle to both ends.

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