Double-machine TBM (Tunnel Boring Machine)

Abstract

The utility model discloses a double-machine TBM (Tunnel Boring Machine) which solves the problem that a main hole and a deeply-buried drainage ditch cannot be constructed synchronously in the prior art. The double-machine TBM comprises a large TBM body and a small TBM body arranged on the lower portion of the large TBM body, the large TBM body and the small TBM body conduct excavation of a large tunnel and a small tunnel at the same time, the small TBM body is connected with the large TBM body through a connecting mechanism, a first deslagging mechanism is arranged in the large TBM body, and a second deslagging mechanism is arranged in the small TBM body. And the second deslagging mechanism is correspondingly connected with the first deslagging mechanism through a lifting conveyor to form a common deslagging system. By means of the design, synchronous excavation of the main hole and the deeply-buried drainage ditch can be conducted synchronously. Compared with an existing tunnel excavation mode, the double-machine TBM has the advantages that a main hole and a deeply-buried drainage ditch can be excavated at the same time, tunnel excavation and secondary lining can be conducted synchronously, the total project construction period is shortened, and construction efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a tunnel construction technical field, especially a double-hole excavation double-machine TBM. BACKGROUND

[0002] With the continuous development of transportation and other infrastructure, tunnel construction is increasing. In the current general tunnel construction, the main hole needs to be excavated first, and then the deep buried drainage ditch at the bottom is excavated separately, and then the inverted arch and secondary lining are constructed. Because the main hole and the drainage ditch cannot be constructed at the same time, it greatly affects the speed of the secondary lining of the tunnel, and further affects the overall construction progress of the tunnel.

[0003] In the prior art, multiple cutters are often used for the excavation of one tunnel, such as a large-diameter split combined pipe jacking machine and its construction method disclosed in CN 114810119 A, which adopts a large and small cutter combination form, optimizes the cutter structure and cutting mode of the traditional circular pipe jacking machine, i.e. reduces the center large cutter cutting torque, and improves the overall cutting efficiency and cutter penetration of the cutter. However, the problem of synchronous construction of the main hole and the deep buried drainage ditch has not been solved. Therefore, it is necessary to design a double-machine TBM to solve this problem. SUMMARY

[0004] In view of the deficiencies in the above background art, the utility model provides a double-machine TBM, which solves the problem that the main hole and the deep buried drainage ditch cannot be constructed synchronously in the prior art.

[0005] The technical solution of the utility model is as follows: a double-machine TBM, comprising a large TBM and a small TBM arranged at the lower part of the large TBM, the large TBM and the small TBM simultaneously excavate two tunnels of different sizes, the small TBM is connected to the large TBM through a connecting mechanism, the large TBM is provided with a first slag discharge mechanism, the small TBM is provided with a second slag discharge mechanism, and the second slag discharge mechanism is connected to the first slag discharge mechanism through a lifting conveyor to form a common slag discharge system. Through the above design, synchronous excavation of the main hole and the deep buried drainage ditch can be realized, and through the common slag discharge system, the load of the small TBM is reduced, the slag discharge of the small TBM is satisfied, and the tunneling efficiency of the small TBM is ensured.

[0006] Further preferably, the tail part of the small TBM is provided with a slag collecting bucket, and the lower slag inlet of the lifting conveyor is located in the slag collecting bucket. The excavated slag of the small TBM is temporarily stored in the slag collecting bucket, and then transported to the first slag discharge mechanism through the lifting conveyor, realizing continuous and efficient slag discharge.

[0007] Further preferably, the connecting mechanism comprises a fixed connecting rod, both ends of the fixed connecting rod are hingedly connected to the main girder of the large TBM and the shield body of the small TBM respectively; the slag discharging end of the second slag discharging mechanism corresponds to the slag collecting bucket, and the slag discharging end of the lifting conveyor corresponds to the slag discharging part of the first slag discharging mechanism; the lifting conveyor is a bucket elevator, and the upper part of the bucket elevator is connected to the main girder of the large TBM.

[0008] Further preferably, the connecting mechanism comprises at least two direction adjusting oil cylinders, both ends of the direction adjusting oil cylinders are hingedly connected to the main girder of the large TBM and the shield body of the small TBM respectively; the lifting conveyor is a telescopic lifting conveyor, the slag discharging end of the second slag discharging mechanism corresponds to the slag collecting bucket, and the slag discharging end of the lifting conveyor corresponds to the slag discharging part of the first slag discharging mechanism.

[0009] Further preferably, the lifting conveyor comprises an upper shell, a lower shell and a conveying chain, the upper shell is hingedly connected to the main girder of the large TBM, the lower shell is hingedly connected to the slag collecting bucket, and the upper shell and the lower shell are inserted and slidingly matched, and the upper shell and / or the lower shell is / are provided with a chain adjusting mechanism matched with the conveying chain.

[0010] Further preferably, the chain adjusting mechanism comprises a telescopic adjusting oil cylinder fixed in the upper shell and / or the lower shell, both ends of the telescopic adjusting oil cylinder are provided with an ear seat, and a sprocket matched with the conveying chain is rotatably arranged on the ear seat. The chain adjusting mechanism is used for adjusting the vertical length of the chain, so as to adapt to the steering of the small TBM.

[0011] Further preferably, the lower part of the main girder of the large TBM is provided with a sliding box support, the sliding box support is provided with a guide rail, and the upper shell and / or the lower shell is / are provided with a sliding block, the sliding block and the guide rail are slidingly matched, and in the steering process of the small TBM, the sliding block moves on the guide rail, so as to improve the stability of the lifting conveyor.

[0012] Further preferably, the large TBM comprises a large cutter head, a large shield body and a main girder, the main girder is fixedly connected to the large shield body, the rear part of the main girder is connected to a rear matching part, the large shield body is provided with a first main drive for driving the large cutter head to rotate; the first slag discharging mechanism is arranged on the main girder and the rear matching part; the first slag discharging mechanism comprises a front conveyor arranged on the main girder and corresponding to the large cutter head and a main machine belt conveyor arranged on the rear matching part; the slag discharging end of the lifting conveyor corresponds to the main machine belt conveyor; the lower part of the main girder is movably connected to an inverted arch crane.

[0013] Further preferably, the small TBM comprises a small cutter head, a front shield and a support shield, the small cutter head is connected with the second main drive arranged in the front shield, the small cutter head is located at the lower rear of the large shield body and the excavation section of the small cutter head intersects with the excavation section of the large cutter head; the front shield and the support shield are provided with a pushing oil cylinder, the support shield is provided with a secondary support shoe, the tail part of the support shield is provided with a residue collecting hopper, the second residue discharging mechanism is a small belt conveyor, the front part of the small belt conveyor is located in the front shield and corresponds to the small cutter head, and the rear part of the small belt conveyor is located in the support shield and corresponds to the residue collecting hopper.

[0014] A double-machine TBM construction method, which adopts the double-machine TBM construction, and steps are as follows:

[0015] S1, placing the double-machine TBM in a to-be-excavated area, the large TBM to-be-excavated area is ahead of the small TBM excavation area;

[0016] S2, simultaneously starting the large TBM and the small TBM, the main support shoe of the large TBM supports the large hole wall, the secondary support shoe of the small TBM supports the small hole wall, the large TBM performs main hole excavation, and the small TBM synchronously performs lower deep buried drainage ditch excavation;

[0017] S3, in the excavation process, the residue of the small TBM excavation is transported to the residue collecting hopper at the tail part of the small TBM through the second residue discharging mechanism, the residue in the residue collecting hopper is lifted and transported to the main machine belt conveyor of the first residue discharging mechanism under the action of the lifting conveyor; at the same time, the residue of the large TBM excavation is transported to the main machine belt conveyor through the front conveyor, and the residue of the small TBM excavation and the residue of the large TBM excavation are both transported to the outside of the hole by the main machine belt conveyor;

[0018] S4, when the tunneling work of one stroke is completed, the large cutter head of the large TBM and the small cutter head of the small TBM stop rotating, the main support shoe of the large TBM is withdrawn, the jacking oil cylinder of the large TBM is retracted to drive the main support shoe and the rear part to move forward, at the same time, the secondary support shoe of the small TBM is withdrawn, and the pushing oil cylinder of the small TBM drives the support shield and the secondary support shoe to migrate, to complete the synchronous step changing of the double-machine TBM;

[0019] S5, repeating steps S2-S4 until the whole double-hole excavation is completed.

[0020] When the deep buried drainage ditch needs to be excavated at a small angle, the connecting mechanism is connected between the large TBM and the small TBM through the steering oil cylinder, the small TBM adjusts the tunneling direction through the steering oil cylinder, at the same time, the lifting conveyor adopts the telescopic elevator to match the steering of the small TBM and successfully discharge the residue.

[0021] The utility model discloses the beneficial effect is: the utility model discloses the two-stage arrangement form of big and small TBM, and the big TBM cutterhead is in front of the small TBM cutterhead, and the synchronous excavation of main hole and lower deep buried drainage ditch is carried out respectively, and the excavation range of big and small TBM overlaps, to reduce the blind area of excavation, improve the excavation efficiency. Big and small TBM structure is in series, and the function is in parallel design, changes the traditional tunnel construction method, realizes the synchronous construction of main hole and deep buried drainage ditch, one -time forming, greatly improves the double -hole construction efficiency.

[0022] The utility model discloses the common residue system of big and small TBM adopts Y type residue line, and this structure design makes small TBM exempt from the configuration of the matching equipment, reduces the load of small TBM and reduces the cost, improves the flexibility of small TBM, further improves the driving efficiency of small TBM.

[0023] The utility model discloses the connecting mechanism can be replaced for the direction adjusting structure, namely through the direction adjusting oil cylinder and realize the connection of big and small TBM, through the direction adjusting oil cylinder and adjust the driving direction of small TBM, can be used for excavating the deep buried water ditch of non - straight line, improves the flexibility of small TBM excavation. Meanwhile for adapting the small TBM of steering, the telescopic elevator is used to the lifting conveyor, when the driving direction of small TBM changes, the vertical residue length changes, for this, the telescopic elevator of the vertical residue length is selected adjustable, to realize the continuity of residue.

[0024] The utility model discloses the double -machine structure and method compared with the existing tunnel excavation mode, adopts this double -machine TBM to excavate main hole and deep buried drainage ditch simultaneously, simultaneously can make the tunnel excavation and secondary lining synchronous, further shorten the total project period, improve the construction efficiency, has higher practical value and popularization value. ACCURACY

[0025] In order to more clearly illustrate the utility model embodiment, the following will be needed to use the drawing in the embodiment description briefly introduced, obviously, the following description in the drawing is only some embodiments of the utility model, for those skilled in the art, under the premise of not paying the creative labor, can also obtain other drawings according to these drawings.

[0026] Figure 1 It is the whole structure schematic diagram of the utility model;

[0027] Figure 2 It is the small TBM structure schematic diagram of the utility model;

[0028] Figure 3 It is the main view schematic diagram of the utility model using double -round TBM;

[0029] Figure 4 It is the residue conveying state schematic diagram of the utility model;

[0030] Figure 5 is a schematic view of the lifting conveyor in Example 2;

[0031] Figure 6 is a schematic view of the chain adjusting mechanism. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] As shown in Figure 1 Example 1, a double-machine TBM includes a large TBM 1 and a small TBM 2 arranged at the lower part of the large TBM 1. The large TBM 1 and the small TBM 2 serve as two excavation devices, and the large TBM 1 and the small TBM 2 simultaneously excavate two tunnels of different sizes. It should be noted that the large TBM 1 can adopt a rectangular or circular shield, and the small TBM 2 can also adopt a rectangular or circular shield. In this embodiment, the large TBM is circular, and the small TBM is circular. The diameter of the large TBM is greater than the diameter of the small TBM, forming a double-circle TBM. The small TBM 2 is connected to the large TBM 1 through a connecting mechanism 3. The connecting mechanism achieves the structural connection of the large and small TBMs. The large TBM 1 is provided with a first slag discharge mechanism 10, and the small TBM 2 is provided with a second slag discharge mechanism 20. The second slag discharge mechanism 20 is connected to the first slag discharge mechanism 10 through a lifting conveyor 30 to form a common slag discharge system. The common slag discharge system adopts a Y-shaped slag discharge line. The first slag discharge mechanism 10 is used to transport the spoil excavated by the large TBM and also used to transport the spoil conveyed by the second slag discharge mechanism to the outside of the tunnel. This structural design eliminates the configuration of the rear matching equipment of the small TBM, reduces the load of the small TBM, reduces the cost, improves the flexibility of the small TBM, and further improves the tunneling efficiency of the small TBM.

[0034] In this embodiment, the tail part of the small TBM 2 is provided with a slag collecting bucket 206. The lower slag inlet of the lifting conveyor 30 is located in the slag collecting bucket 206 and used to transport the spoil in the slag collecting bucket. The spoil excavated by the small TBM is temporarily stored in the slag collecting bucket and then transported to the first slag discharge mechanism through the lifting conveyor, realizing continuous and efficient slag discharge.

[0035] The connecting mechanism 3 in the embodiment includes a fixed connecting rod, which is only used to connect the large TBM, so that the large TBM is located above the small TBM, and the small TBM is located below and at the rear of the large TBM, thereby ensuring the synchronism of the excavation of the two. The two ends of the fixed connecting rod are respectively hinged to the main girder 4 of the large TBM 1 and the shield body of the small TBM 2, thereby realizing the connection between the two. The slag discharging end of the second slag discharging mechanism 20 corresponds to the slag collecting bucket 206, and the slag discharging end of the lifting conveyor 30 corresponds to the slag discharging part of the first slag discharging mechanism 10. As shown in Figure 4 the lifting conveyor 30 is a bucket elevator, the upper part of which is connected to the main girder 4 of the large TBM 1, and the main girder is used to bear the weight of the bucket elevator, thereby reducing the load of the slag collecting bucket and the small TBM. In the embodiment, the bucket elevator can adopt a conventional elevator, the slag inlet of which is located in the slag collecting bucket for slag feeding, and the slag outlet is located above the main machine belt conveyor of the first slag discharging mechanism, thereby completing the slag transportation from the second slag discharging mechanism to the first slag discharging mechanism, realizing the synchronous slag discharging of the large and small TBMs, and satisfying the simultaneous excavation of the main tunnel and the deep drainage ditch, thereby improving the efficiency of tunnel construction.

[0036] As shown in Figure 3 the embodiment 2, a double-machine TBM includes a large TBM 1 and a small TBM 2 arranged at the lower part of the large TBM 1. The large TBM 1 and the small TBM 2 serve as two excavation devices, and the large TBM 1 and the small TBM 2 simultaneously excavate two tunnels of different sizes. It should be noted that the large TBM 1 can adopt a rectangular or circular shield, and the small TBM 2 can also adopt a rectangular or circular shield. In the embodiment, the large TBM is circular, and the small TBM is circular. The diameter of the large TBM is greater than that of the small TBM, thereby forming a double-circle TBM. The small TBM 2 is connected to the large TBM 1 through a connecting mechanism 3, the connection between the large and small TBMs is realized through the connecting mechanism, the first slag discharging mechanism 10 is arranged in the large TBM 1, the second slag discharging mechanism 20 is arranged in the small TBM 2, and the second slag discharging mechanism 20 is connected to the first slag discharging mechanism 10 through a lifting conveyor 30 to form a common slag discharging system. The common slag discharging system adopts a Y-shaped slag discharging line. The first slag discharging mechanism 10 is used to transport the slag excavated by the large TBM, and also used to transport the slag transported by the second slag discharging mechanism to the outside of the tunnel. The structure design eliminates the configuration of the rear matching equipment of the small TBM, reduces the load of the small TBM, reduces the cost, improves the flexibility of the small TBM, and further improves the tunneling efficiency of the small TBM.

[0037] In the embodiment, the tail part of the small TBM 2 is provided with a slag collecting bucket 206, and the lower slag inlet of the lifting conveyor 30 is located in the slag collecting bucket 206, thereby being used to transport the slag in the slag collecting bucket. The slag excavated by the small TBM is temporarily stored in the slag collecting bucket, and then transported to the first slag discharging mechanism through the lifting conveyor, thereby realizing continuous and efficient slag discharging.

[0038] The connecting mechanism 3 in the embodiment comprises at least two steering oil cylinders 207, which are connected between the large and small TBMs in a V shape and divided into two groups. The two ends of the steering oil cylinders 207 are respectively hinged to the main girder 4 of the large TBM 1 and the shield body of the small TBM 2, and have a certain degree of freedom. The steering oil cylinders are used to adjust the tunneling direction of the small TBM, which can be used to excavate a non-linear deep buried water ditch and improve the flexibility of the small TBM. In order to adapt to the small TBM capable of steering, the lifting conveyor 30 is a telescopic elevator. When the tunneling direction of the small TBM changes, the vertical length of the slag discharge changes. Therefore, the telescopic elevator with adjustable vertical length of slag discharge is selected to realize the continuity of slag discharge. The slag discharge end of the second slag discharge mechanism 20 in the embodiment is also corresponding to the slag collecting bucket 206, which is used for receiving and temporarily storing the slag. The slag discharge end of the lifting conveyor 30 corresponds to the slag discharge part of the first slag discharge mechanism 10. The slag in the slag collecting bucket enters the first slag discharge mechanism through the lifting machine, and is transported to the outside of the hole, thereby realizing the combined slag discharge of the large and small TBMs, improving the slag discharge efficiency, and ensuring the synchronization of the large and small TBM excavation.

[0039] As shown in Figure 5 The lifting conveyor 30 in the embodiment comprises an upper shell 301, a lower shell 302 and a conveying chain 303. The upper shell 301 is hinged to the main girder 4 of the large TBM 1, the lower shell 302 is hinged to the inside of the slag collecting bucket 206, and the upper shell 301 and the lower shell 302 are inserted and slidably connected. The lower shell is shorter than the upper shell, thereby reducing the load of the small TBM. It should be noted that in order to further reduce the load of the slag collecting bucket, the lower shell can also be connected to the upper shell by using a vertical oil cylinder, so as to concentrate the weight on the main girder. During the steering process of the small TBM, the upper and lower shells can slide relative to each other to change the length of the entire shell, so as to ensure the continuity of the slag discharge. In addition, the upper shell 301 and / or the lower shell 302 are provided with a chain adjusting mechanism matched with the conveying chain 303. The chain adjusting mechanism is used to adjust the length of the chain, so as to adapt to the shell and the large and small TBMs, and realize the synchronous slag discharge. The conveying chain is similar to other bucket elevators, which has a bucket engaged with an upper sprocket provided in the upper shell and a lower sprocket provided in the lower shell. The upper sprocket is connected with a driving motor, which drives the chain to rotate under the action of the motor, thereby realizing the lifting and transportation of the slag.

[0040] Specifically, as shown in Figure 6As shown, the chain adjusting mechanism in the embodiment includes a telescopic adjusting oil cylinder 304 fixed in the upper housing 301 and / or the lower housing 302, both ends of the telescopic adjusting oil cylinder 304 are provided with an ear seat, and a sprocket 305 cooperating with the conveying chain 303 is rotatably arranged on the ear seat. The telescopic adjusting oil cylinder can be arranged in the upper housing 301 or the lower housing 302 according to the need, or can be arranged in both the upper housing 301 and the lower housing 302, and the specific arrangement position can be selected according to the actual need. The telescopic adjusting oil cylinder preferably adopts a bidirectional telescopic oil cylinder. The oil cylinder is arranged between the endless chain, and both sprockets are engaged with the corresponding chain; when the upper and lower housing directions slide relative to each other to increase the length, the corresponding telescopic adjusting oil cylinder is retracted, the vertical length of the conveying chain is increased, the steering of the small TBM is adapted, and the continuous slag discharge is ensured.

[0041] In order to further improve the stability of the lifting conveyor, the lower part of the main girder 4 of the large TBM 1 is fixedly provided with a sliding box support 306, the sliding box support 306 is provided with a guide rail 307, and the upper housing 301 and / or the lower housing 302 is provided with a sliding block 308. When the upper housing is inserted into the lower housing, the sliding block is arranged on the upper housing 301, and when the lower housing is inserted into the upper housing, the sliding block is arranged on the lower housing. The sliding block 308 and the guide rail 307 are in sliding cooperation. During the steering of the housing with the small TBM, the sliding block slides on the guide rail with the housing, plays a supporting role for the lifting conveyor, ensures the stability, and at the same time reduces the bearing pressure on the small TBM.

[0042] Embodiment 3: a double-machine TBM, based on Embodiment 1 or 2, the large TBM 1 further comprises a large cutterhead 1-1, a large shield 31, a main girder 4 and a pushing oil cylinder, the main girder 4 is fixedly connected with the large shield 31, the rear part of the main girder 4 is connected with a rear matching device 8, the rear matching device provides power and material transportation for the double-circle TBM. The pushing oil cylinder provides the excavation axial force of the large TBM. The large shield 31 is provided with a first main drive for driving the large cutterhead 1-1 to rotate. The first slag discharging mechanism 10 is arranged on the main girder 4 and the rear matching device 8. The first slag discharging mechanism 10 comprises a front conveyor arranged on the main girder 4 and corresponding to the large cutterhead 1-1, and a main machine belt conveyor 6 arranged on the rear matching device 8. The front conveyor can be a screw conveyor, which is used for front conveying of slag soil. The main machine belt conveyor 6 is used for rear conveying of slag soil. The slag discharging end of the lifting conveyor 30 corresponds to the main machine belt conveyor 6, and the lifting conveyor 30 is located at the side of the belt conveyor. The lifting conveyor 30 conveys the slag soil conveyed by the second slag discharging mechanism to the main machine belt conveyor, and then to the outside of the hole. The main girder 4 is movably connected with an inverted arch crane 7 at the lower part. The main girder 4 is further provided with a supporting system 5, which provides necessary initial support for the large TBM to excavate the main hole, including an anchor rod drilling machine, etc. The inverted arch crane 7 is used for lifting and laying inverted arch blocks 9, which are transported by a trolley. During the excavation of the double-circle TBM, the installation of the inverted arch blocks 9 can be carried out synchronously without interference. The main girder 4 is further provided with a main support shoe, which provides counterforce for the TBM excavation by tightening the hole wall and relying on friction. The main girder 4 is further provided with a rear support, which improves the stability of the large TBM step change.

[0043] As Figure 2As shown, the small TBM 2 in this embodiment includes a small cutter head 201, a front shield 202, and a support shield 204, the small cutter head 201 is connected with the second main drive 208 arranged in the front shield 202, the small cutter head 201 is located below and behind the large shield body 31, and the excavation section of the small cutter head 201 intersects with the excavation section of the large cutter head 1-1; the excavation range of the large TBM slightly overlaps with the excavation range of the small TBM, so as to reduce the excavation blind area. The front shield 202 and the support shield 204 are provided with a pushing oil cylinder 203, the pushing oil cylinder 203 provides the axial force for the tunneling of the small TBM, and can also provide the steering for the TBM. The support shield 203 is provided with a secondary support shoe 205, the secondary support shoe 205 is tightly pressed against the tunnel wall, and relies on the friction force to provide the counterforce for the tunneling of the small TBM; the tail part of the support shield 203 is provided with a residue collecting hopper 206, the second residue discharging mechanism 20 is a small belt conveyor 209, the front part of the small belt conveyor 209 is located in the front shield 202 and corresponds to the small cutter head 201, and the rear part of the small belt conveyor 209 is located in the support shield 203 and corresponds to the residue collecting hopper 206. The residue excavated by the small cutter head 201 enters the residue collecting hopper through the small belt conveyor, and then is transported to the main belt conveyor through the lifting conveyor, so as to complete the combined residue discharging. In this embodiment, the double-machine TBM adopts the upper and lower two-stage arrangement of the large and small circular TBMs, the cutter head of the large TBM is arranged in front of the cutter head of the small TBM, and the excavation ranges of the large and small TBMs slightly overlap, so as to reduce the excavation blind area and ensure the smooth tunneling of the small TBM.

[0044] Embodiment 4: A double-machine TBM construction method, which adopts the double-machine TBM construction in embodiment 3, and the steps are as follows:

[0045] S1: Place the double-machine TBM in the to-be-excavated area, the excavation area of the large TBM 1 is ahead of the excavation area of the small TBM 2; and provide the double-machine TBM with a suitable starting tunneling area.

[0046] S2: Start the large TBM 1 and the small TBM 2 at the same time, the main support shoe of the large TBM 1 tightly presses against the large tunnel wall, the secondary support shoe 205 of the small TBM 2 tightly presses against the small tunnel wall, the large TBM 1 performs main tunnel excavation, and the small TBM 2 synchronously performs lower deep buried drainage ditch excavation. During the excavation process, the jacking oil cylinder of the large TBM 1 and the pushing oil cylinder 205 of the small TBM push forward, the large and small TBMs move forward, and the large cutter head 1-1 and the small cutter head 201 rotate and tunnel.

[0047] S3: During the excavation process, the residue excavated by the small TBM 2 is transported to the residue collecting hopper 206 at the tail part of the small TBM 2 through the second residue discharging mechanism 20, the residue in the residue collecting hopper 206 is lifted and transported to the main belt conveyor 6 of the first residue discharging mechanism 10 under the action of the lifting conveyor 30; at the same time, the residue excavated by the large TBM 1 is transported to the main belt conveyor 6 through the front conveyor, and the residue excavated by the small TBM 2 and the residue excavated by the large TBM 1 are both transported to the outside of the tunnel by the main belt conveyor 6, so as to continuously perform the combined continuous residue discharging of the large and small TBMs.

[0048] When the S4 completes a tunneling process, the large cutter head 1-1 of the large TBM 1 and the small cutter head 201 of the small TBM 2 stop rotating, the main support shoe of the large TBM 1 is retracted, the pushing oil cylinder of the large TBM 1 is retracted to drive the main support shoe and the rear matching part to move forward, at the same time, the auxiliary support shoe 205 of the small TBM 2 is retracted, the pushing oil cylinder 203 of the small TBM 2 drives the support shield 204 and the auxiliary support shoe 205 to move, and the synchronous step changing of the double-machine TBM is completed. A tunneling process of the double-circle TBM is completed. The supporting system 5 performs primary support along with the tunneling process, and the inverted arch block 9 can be hoisted and installed at any time, and the tunneling process is not affected.

[0049] S5 repeats steps S2-S4 until the entire double-hole excavation is completed.

[0050] It should be pointed out that when the deep buried drainage ditch needs to be excavated at a small angle, the connecting mechanism 3 is connected between the large TBM 1 and the small TBM 2 through the steering oil cylinder 207, the small TBM 2 adjusts the tunneling direction through the steering oil cylinder 207 in cooperation with the pushing oil cylinder, at the same time, the lifting conveyor 30 adopts a telescopic elevator to match the steering of the small TBM 2, and the slag is smoothly discharged.

[0051] Compared with the existing tunnel excavation mode, the double-machine TBM can simultaneously excavate the main hole and the deep buried drainage ditch, the tunnel excavation and the secondary lining can be simultaneously performed, the total project period is shortened, and the construction efficiency is improved.

[0052] In the description of the utility model creation, it should be understood that the orientation or positional relationship indicated by the terms "vertical", "horizontal", "upper", "lower", "front", "rear", "left", "right", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model creation and simplifying the description, and therefore cannot be understood as a limitation on the utility model creation.

[0053] In the description of the utility model creation, it should be pointed out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection" and "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model creation can be understood according to the specific circumstances.

[0054] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A twin machine TBM characterized by: The application relates to a tunnel boring machine (TBM) system, which comprises a large TBM (1) and a small TBM (2) arranged at the lower part of the large TBM (1), the large TBM (1) and the small TBM (2) simultaneously excavate two tunnels, the small TBM (2) is connected with the large TBM (1) through a connecting mechanism (3), the large TBM (1) is internally provided with a first slag discharging mechanism (10), the small TBM (2) is internally provided with a second slag discharging mechanism (20), and the second slag discharging mechanism (20) is connected with the first slag discharging mechanism (10) through a lifting conveyor (30) to form a common slag discharging system.

2. The twin TBM of claim 1, wherein: The tail part of the small TBM (2) is provided with a slag collecting bucket (206), and the lower slag inlet of the lifting conveyor (30) is located in the slag collecting bucket (206).

3. The twin TBM of claim 2, wherein: The connecting mechanism (3) comprises a fixed connecting rod, the two ends of the fixed connecting rod are respectively hinged to the main girder (4) of the large TBM (1) and the shield body of the small TBM (2), the slag discharging end of the second slag discharging mechanism (20) corresponds to the slag collecting bucket (206), and the slag discharging end of the lifting conveyor (30) corresponds to the slag discharging part of the first slag discharging mechanism (10); the lifting conveyor (30) is a bucket elevator, and the upper part of the bucket elevator is connected to the main girder (4) of the large TBM (1).

4. The twin TBM of claim 2, wherein: The connecting mechanism (3) comprises at least two direction adjusting oil cylinders (207), the two ends of the direction adjusting oil cylinders (207) are respectively hinged to the main girder (4) of the large TBM (1) and the shield body of the small TBM (2), the lifting conveyor (30) is a telescopic elevator, the slag discharging end of the second slag discharging mechanism (20) corresponds to the slag collecting bucket (206), and the slag discharging end of the lifting conveyor (30) corresponds to the slag discharging part of the first slag discharging mechanism (10).

5. The twin TBM of claim 4, wherein: The lifting conveyor (30) comprises an upper shell (301), a lower shell (302) and a conveying chain (303), the upper shell (301) is hinged to the main girder (4) of the large TBM (1), the lower shell (302) is hinged to the slag collecting bucket (206), the upper shell (301) and the lower shell (302) are in plug-in sliding fit, and the upper shell (301) and / or the lower shell (302) are internally provided with a chain adjusting mechanism matched with the conveying chain (303).

6. The twin TBM of claim 5, wherein: The chain adjusting mechanism comprises telescopic adjusting oil cylinders (304) fixed in the upper shell (301) and / or the lower shell (302), the two ends of the telescopic adjusting oil cylinders (304) are provided with ear seats, and sprockets (305) matched with the conveying chain (303) are rotatably arranged on the ear seats.

7. The twin TBM of claim 6, wherein: The lower part of the main girder (4) of the large TBM (1) is provided with a sliding box support (306), the sliding box support (306) is provided with guide rails (307), the upper shell (301) and / or the lower shell (302) are provided with sliding blocks (308), and the sliding blocks (308) are in sliding fit with the guide rails (307).

8. The twin TBM of any one of claims 1-7, wherein: The large TBM (1) comprises a large cutter head (1-1), a large shield (31) and a main girder (4), the main girder (4) is fixedly connected with the large shield (31), the rear part of the main girder (4) is connected with a rear matching part (8), the large shield (31) is internally provided with a first main drive for driving the large cutter head (1-1) to rotate; a first slag discharging mechanism (10) is arranged on the main girder (4) and the rear matching part (8); the first slag discharging mechanism (10) comprises a front conveyor arranged on the main girder (4) and corresponding to the large cutter head (1-1) and a main machine belt conveyor (6) arranged on the rear matching part (8); the slag discharging end of the lifting conveyor (30) corresponds to the main machine belt conveyor (6); the lower part of the main girder (4) is movably connected with an inverted arch crane (7).

9. The twin TBM of claim 8, wherein: The small TBM (2) comprises a small cutter head (201), a front shield (202) and a supporting shield (204), the small cutter head (201) is connected with a second main drive (208) arranged in the front shield (202), the small cutter head (201) is located below and behind the large shield (31) and the excavation section of the small cutter head (201) intersects with the excavation section of the large cutter head (1-1); the front shield (202) and the supporting shield (204) are provided with a propelling oil cylinder (203) therebetween, the supporting shield (204) is provided with a secondary supporting shoe (205), the tail part of the supporting shield (204) is provided with a slag collecting hopper (206), a second slag discharging mechanism (20) is a small belt conveyor (209), the front part of the small belt conveyor (209) is located in the front shield (202) and corresponds to the small cutter head (201), the rear part of the small belt conveyor (209) is located in the supporting shield (204) and corresponds to the slag collecting hopper (206).

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