Long distance tunneling cutter head capable of cutting piles in soft soil layer and tunneling method thereof

Abstract

The application belongs to the technical field of shield construction, and discloses a long-distance tunneling cutter head capable of cutting piles in soft soil layers and a tunneling method thereof. The tunneling cutter head comprises a disc body, a fishtail cutter, spoke assemblies fixed on the disc surface of the disc body, a plurality of main spokes, a plurality of cutting tool groups, a plurality of second tearing tool groups, a plurality of scraper groups, and a plurality of first wear monitors. The height of the first scraper is lower than that of the cutting tool, and the first scraper is used for scraping and peeling the cut soil and pile body. The first wear monitors are respectively fixed on the main spokes, and are used for monitoring whether the wear of the first scraper exceeds a first set value, and sending a signal for replacing the cutting tool when the wear of the first scraper exceeds the first set value. The shield machine directly cuts piles, and fast tunneling, which greatly reduces the construction cost and shortens the construction period. Compared with the pile cutting cutter head design relying on a single tearing tool or a rolling tool, the cutter head has higher adaptability and strong risk response ability.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of shield construction, and particularly relates to a long-distance tunneling cutter head capable of cutting piles in soft soil layers and a tunneling method thereof. BACKGROUND

[0002] In existing projects, there are existing pipe piles, such as mud piers and pipelines sunk in river bottoms, and the shield machine needs to be designed to cut piles. The shield machine passes through potential pile foundations, which is difficult and risky to construct. Common pile removal measures include pile foundation underpinning before the shield arrives, manual hole digging pile removal, pile pulling, and pile flushing, but these methods have a large impact on the surrounding environment, and are high in construction cost and long in construction period. The shield directly cutting and breaking the obstacle pile has obvious advantages and significant economic and social benefits, and has a broader application prospect in engineering practice, but the shield pile cutting technology still needs further exploration in terms of both theoretical research and technical practice. Generally, a pure cutter head with a cutter in the prior art has the ability to cut piles, but it is not suitable for soft soil layers. The cutter usually faces serious mud cake and severe eccentric wear in soft soil layers, especially in clay soil and silt soil layers, which leads to the inability of the cutter head to tunnel for a long distance. Therefore, the present application provides a long-distance tunneling cutter head capable of cutting piles in soft soil layers and a tunneling method thereof to solve the above problems. SUMMARY

[0003] To solve the above problems, the present application provides a long-distance tunneling cutter head capable of cutting piles in soft soil layers and a tunneling method thereof, which solves the problems of high cost of manual pile removal and serious mud cake in cutter pile removal.

[0004] The present application is realized by the following scheme: a long-distance tunneling cutter head capable of cutting piles in soft soil layers, comprising:

[0005] a disc body;

[0006] a fish tail cutter fixed at the center of the disc surface of the disc body;

[0007] a spoke assembly fixed on the disc surface of the disc body, the spoke assembly comprising a plurality of main spokes, and the plurality of main spokes being arranged in a diverging manner on the disc surface of the disc body from the center of the disc surface;

[0008] a plurality of cutting tool groups, each cutting tool group comprising a plurality of cutting tools arranged at intervals along the length direction of the corresponding main spoke, the cutting tools being selected from cutters and first tear cutters, and being detachably connected to the corresponding main spoke;

[0009] a plurality of second tear cutter groups are fixed on the plurality of main spokes respectively, each of the second tear cutter groups comprises a plurality of second tear cutters arranged alternately with a plurality of cutting knives on the same main spoke, the height of the cutting knives, the height of the second tear cutters and the height of the fishtail knives are consistent, and the second tear cutters are used for synchronous cutting of the soil body and the pile body;

[0010] a plurality of scraper groups are fixed on one side of the plurality of main spokes towards the adjacent main spokes respectively, each of the scraper groups comprises a plurality of first scrapers arranged at intervals, the height of the first scrapers is lower than the height of the cutting knives, and the first scrapers are used for scraping and peeling the soil body and the pile body after being cut;

[0011] a plurality of first wear monitors are fixed on the plurality of main spokes respectively, the first wear monitors are used for monitoring whether the wear of the first scrapers exceeds a first set value, and a signal of replacing the cutting knives is sent when it is monitored that the wear of the first scrapers exceeds the first set value.

[0012] The further improvement of the long-distance tunneling cutter head capable of cutting piles in soft soil layers of the present application lies in that the spoke assembly further comprises a plurality of secondary spokes, the plurality of secondary spokes are arranged along the periphery of the disc surface of the disc body and are arranged alternately and at intervals between the plurality of main spokes, and are used for compensating the cutting gap formed between the adjacent main spokes, a plurality of third tear cutters are fixed at intervals along the length direction on each of the secondary spokes, and the height of the third tear cutters is consistent with the height of the second tear cutters.

[0013] a plurality of second scrapers are arranged at intervals on one side of the secondary spokes towards the main spokes, and the height of the second scrapers is consistent with the height of the first scrapers.

[0014] The further improvement of the long-distance tunneling cutter head capable of cutting piles in soft soil layers of the present application lies in that an interval is left between each of the secondary spokes and the center position of the disc surface of the disc body, a plurality of fourth tear cutters are fixed in the interval, the plurality of fourth tear cutters are linearly arranged with the plurality of third tear cutters on the same secondary spoke, and the height of the fourth tear cutters is consistent with the height of the third tear cutters.

[0015] The further improvement of the long-distance tunneling cutter head capable of cutting piles in soft soil layers of the present application lies in that the first wear monitor can be used for monitoring whether the wear of the second scrapers exceeds the first set value at the same time, and the signal of replacing the cutting knives is sent when it is monitored that the wear of any one of the first scrapers and the second scrapers exceeds the first set value.

[0016] The further improvement of the long-distance tunneling cutter head capable of cutting piles in soft soil layers of the present application lies in that the tunneling cutter head further comprises a second wear monitor used for monitoring whether the disc surface of the disc body is worn and alarming when it is monitored that the disc surface of the disc body is worn, and the second wear monitor is fixed on the main spoke.

[0017] The further improvement of the long-distance tunneling cutter head capable of cutting piles in soft soil layers of the present application lies in that the tunneling cutter head further comprises a third wear monitoring group for monitoring whether the wear of any one of the first scrapers on the main spokes close to the periphery of the disc body and the second scrapers on the auxiliary spokes close to the periphery of the disc body exceeds a second set value and alarming when the wear exceeds the second set value, and the third wear monitoring group is fixed to one end of the main spokes close to the periphery of the disc body.

[0018] The further improvement of the long-distance tunneling cutter head capable of cutting piles in soft soil layers of the present application lies in that the main spokes are provided with a plurality of installation slots corresponding to a plurality of cutting tools respectively, and each of the cutting tools comprises a tool box fixed in the corresponding installation slot, a tool seat inserted into the tool box, and a tool body fixed to the tool seat and extending out of the tool box.

[0019] Each of the cutting tools further comprises a fastener for fixing the tool seat and the tool box.

[0020] A tunneling method of the long-distance tunneling cutter head capable of cutting piles in soft soil layers as described above comprises the following steps:

[0021] S1, starting the rotation and advancement of the tunneling cutter head to drive the plurality of first tearing tools, the plurality of second tearing tools and the fish tail tool to cut the soil and the pile in advance, and drive the first scrapers to scrape and peel the cut soil and pile;

[0022] S2, during the rotation and advancement of the tunneling cutter head, monitoring by the first wear monitoring device, and stopping the tunneling cutter head when receiving the signal of replacing the cutting tool from the first wear monitoring device;

[0023] S3, replacing the first tearing tool with a roller cutter, and then returning to step S1.

[0024] The further improvement of the tunneling method of the long-distance tunneling cutter head capable of cutting piles in soft soil layers of the present application lies in that the spoke assembly further comprises a plurality of auxiliary spokes, and the plurality of auxiliary spokes are arranged along the periphery of the disc surface of the disc body and are alternately and spacedly arranged between the plurality of main spokes, a plurality of third tearing tools are fixed on each of the auxiliary spokes along the length direction, and the height of the third tearing tool is consistent with the height of the second tearing tool; a plurality of second scrapers are spacedly arranged on the side of the auxiliary spokes facing the main spokes, and the height of the second scraper is consistent with the height of the first scraper.

[0025] When step S1 is performed, the third tearing tool cuts the soil and the pile together with the first tearing tool, the second tearing tool and the fish tail tool, and the second scraper scrapes and peels the cut soil and pile together with the first scraper.

[0026] The further improvement of the long-distance tunneling cutter head of the pile cutting tunneling method in soft soil layer of the present application is that the tunneling cutter head further comprises a third wear monitor group, and the third wear monitor group is fixed to the main spoke near one end of the disc body periphery.

[0027] In the process of rotating and advancing of the tunneling cutter head, the third wear monitor group is used to monitor the wear of any one of the first scraper near the disc body periphery on the main spoke and the second scraper near the disc body periphery on the auxiliary spoke, and an alarm is given when the third wear monitor group monitors that the wear of any one exceeds the second set value;

[0028] After receiving the alarm signal of the third wear monitor group, the tunneling cutter head is controlled to stop;

[0029] The first scraper near the disc body periphery on the main spoke and the second scraper near the disc body periphery on the auxiliary spoke are replaced, and then the step S1 is returned.

[0030] Compared with the prior art, the present application has the following beneficial effects:

[0031] The present application directly cuts piles by the shield machine, and quickly tunnels, so that the construction cost is greatly reduced and the construction period is shortened; compared with the pile cutting cutter head design relying on the tearing cutter or the rolling cutter alone, the cutter head has higher adaptability and strong risk response ability; the multi-level wear monitoring and cutter health management system can timely discover risks in the process of pile cutting and soft soil long-distance tunneling, and has high reliability. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 The disc surface structure schematic diagram of the present application is shown.

[0033] Figure 2 The cutter height difference schematic diagram of the cutting tool and the first scraper of the present application is shown.

[0034] Figure 3 The first tearing cutter and the cutter box connection structure schematic diagram of the present application is shown.

[0035] Figure 4 The rolling cutter and the cutter box connection structure schematic diagram of the present application is shown.

[0036] Figure 5 The cutter box and the cutter seat connection structure schematic diagram of the present application is shown.

[0037] Figure 6 The wedge block installation position schematic diagram of the present application is shown.

[0038] Figure 7 The second bolt installation position schematic diagram of the present application is shown.

[0039] Figure 8 The surface position schematic diagram of the present application is shown.

[0040] In the figure: 1, disc body; 2, fish tail knife; 3, main spoke; 4, auxiliary spoke; 5, cutting knife; 501, knife box; 502, knife body; 503, knife seat; 5031, third screw hole; 5032, limiting block; 504, fastener; 5041, mounting port; 5042, tension block; 5043, first screw hole; 5044, stop washer; 5045, second screw hole; 5046, first bolt; 5047, tension port; 5048, wedge block; 5049, second bolt; 6, second tearing knife; 7, first scraper; 8, third tearing knife; 9, second scraper; 10, fourth tearing knife; 11, first wear monitor; 12, third wear monitor; 13, second wear monitor; 14, cutting track. DETAILED DESCRIPTION

[0041] In order to solve the problems of high cost of manual pile removal and serious mud cake caused by cutter pile removal, the application provides a long-distance tunneling cutter head capable of cutting piles in soft soil layers and a tunneling method thereof. The long-distance tunneling cutter head capable of cutting piles in soft soil layers and the tunneling method thereof are further described below in combination with specific embodiments and the accompanying drawings.

[0042] Referring to Figures 1-8 The long-distance tunneling cutter head capable of cutting piles in soft soil layers comprises:

[0043] a disc body 1;

[0044] a fish tail knife 2 fixed at the center of the disc surface of the disc body 1;

[0045] a spoke assembly fixed on the disc surface of the disc body 1, wherein the spoke assembly comprises a plurality of main spokes 3, and the plurality of main spokes 3 are arranged in a diverging manner on the disc surface of the disc body 1 from the center of the disc surface;

[0046] a plurality of cutting knife groups, each of which is arranged on a corresponding main spoke 3 and comprises a plurality of cutting knives 5, wherein the plurality of cutting knives 5 are arranged in a spaced manner along the length direction of the corresponding main spoke 3, the cutting knives 5 are selected from a rolling cutter and a first tearing knife, and the cutting knives 5 are detachably connected to the corresponding main spoke 3;

[0047] a plurality of second tearing knife groups, each of which is fixed on a corresponding main spoke 3 and comprises a plurality of second tearing knives 6 arranged alternately with the plurality of cutting knives 5 on the same main spoke 3, wherein the height of the cutting knives 5, the height of the second tearing knives 6 and the height of the fish tail knife 2 are consistent, and the plurality of second tearing knives 6 are used for synchronous cutting of soil and pile bodies;

[0048] a plurality of first scrapers 7 arranged at intervals, the height of the first scrapers 7 being lower than the height of the cutting knives 5, for scraping and peeling the soil and pile body after cutting;

[0049] a plurality of first wear monitors 11 fixed on the plurality of main spokes 3, for monitoring whether the wear of the first scrapers 7 exceeds a first set value, and sending a signal to replace the cutting knives 5 when the wear of the first scrapers 7 is monitored to exceed the first set value.

[0050] Specifically, the full-face cutting track 14 can be formed by the arrangement of the fishtail cutter 2, the cutting knife 5 and the second tearing knife 6, so as to better cut the soil and pile body; the full-face scraping track can be formed by the arrangement of the first scraper 7, so as to better scrape the soil and pile body after cutting; the first set value is 2 mm, and the wear of the first scraper 7 on different scraping tracks can be monitored in real time by the plurality of first wear monitors 11, so as to judge the cutting state of the cutter; when the first scraper 7 has no wear or only a small amount of wear, the wear of the scraper should be 0, and at this time it can be judged that the cutting state is good; when the wear exceeds 2 mm, it means that the protection of the first scraper 7 by the cutting knife 5 and the second tearing knife 6 is invalid, and at this time it can be judged that the cutting knife 5 of the first tearing knife should be at risk for the pile body, and the first tearing knife should be replaced by a rolling cutter for cutting the pile body in time to avoid serious wear of the cutter;

[0051] Further, as shown in Figure 2 the height of the cutting knife 5 and the second tearing knife 6 is 180 mm, the height of the first scraper 7 is 135 mm, and the height difference is 45 mm; by setting the height difference, the cutter with higher height can cut first and protect the first scraper 7.

[0052] Among them, as shown in Figure 1 the spoke assembly further comprises a plurality of secondary spokes 4, and the plurality of secondary spokes 4 are arranged along the periphery of the disc surface of the disc body 1 and are alternately and spaced apart from the plurality of main spokes 3, for filling the cutting gap formed between the adjacent main spokes 3, and a plurality of third tearing knives 8 are fixed at intervals along the length direction on each secondary spoke 4, and the height of the third tearing knife 8 is consistent with the height of the second tearing knife 6;

[0053] a plurality of second scrapers 9 are arranged at intervals on the side of the secondary spoke 4 facing the main spoke 3, and the height of the second scraper 9 is consistent with the height of the first scraper 7.

[0054] Specifically, by arranging the third tearing knife 8, the cutting knife 5 between the adjacent main spokes 3 can be filled, so as to improve the cutting frequency of the soil and pile body at the same time, and further improve the cutting efficiency; by arranging the second scraper 9, the scraping efficiency can be greatly improved.

[0055] As shown in Figure 1 Each of the vice spokes 4 is spaced from the center of the disc surface of the disc body 1, and a plurality of fourth tear knives 10 are fixed in the space. The fourth tear knives 10 are linearly arranged with the plurality of third tear knives 8 on the same vice spoke 4, and the height of the fourth tear knives 10 is consistent with the height of the third tear knives 8.

[0056] The linear arrangement of the fourth tear knives 10 and the third tear knives 8 can improve the cutting frequency at the same time, thereby improving the cutting efficiency.

[0057] As shown in Figure 1 The first wear monitor 11 can also be used to monitor whether the wear of the second scraper 9 exceeds the first set value. When the wear of any one of the first scraper 7 and the second scraper 9 exceeds the first set value, a signal for replacing the cutting tool 5 is sent.

[0058] The plurality of first wear monitors 11 can monitor the wear of the first scraper 7 and the second scraper 9 on different scraping trajectories in real time, so as to determine the cutting state of the tool. When the wear of any one of the first scraper 7 and the second scraper 9 is zero or micro-wear, the wear of the scraper is 0, and the cutting state is good at this time. When the wear exceeds 2mm, it indicates that the protection of the first scraper 7 and the second scraper 9 by the cutting tool 5, the second tear knife 6, the third tear knife 8 and the fourth tear knife 10 is invalid, and the cutting tool 5 of the first tear knife is at risk for the pile body at this time. The first tear knife should be replaced with a rolling cutter to cut the pile body in time to avoid serious tool wear.

[0059] As shown in Figure 1 The tunneling cutter head further comprises a second wear monitor 13 for monitoring whether the disc surface of the disc body 1 is worn and alarming when the disc surface of the disc body 1 is worn. The second wear monitor 13 is fixed on the main spoke 3.

[0060] Specifically, the number of the second wear monitor 13 is two, and the two second wear monitors 13 are respectively fixed on the sides of the two main spokes 3 facing the adjacent main spokes 3. The disc surface of the disc body 1 can be monitored in real time by the second wear monitor 13. Once the disc surface of the disc body 1 is worn to 25mm, an alarm will be prompted, and the tunneling cutter head will be stopped and the corresponding tool replacement measures will be taken.

[0061] As shown in Figure 1As shown, the tunneling cutter head further comprises a third wear monitor group 12 for monitoring whether the wear of any one of the first scrapers 7 on the main spoke 3 close to the periphery of the disc body 1 and the second scrapers 9 on the auxiliary spoke 4 close to the periphery of the disc body 1 exceeds a second set value, and alarming when the wear exceeds the second set value.

[0062] Specifically, the first scrapers 7 on the main spoke 3 close to the edge of the disc body 1 and the second scrapers 9 on the auxiliary spoke 4 close to the edge of the disc body 1 are both arc scrapers, and each third wear monitor group comprises two third wear monitors 12, which are respectively arranged on both sides of the same main spoke 3, for monitoring the arc scrapers on both sides of the same main spoke 3 close to the edge of the disc body 1 and the arc scrapers on both sides of the same auxiliary spoke 4 close to the edge of the disc body 1 in real time. Once the wear exceeds the second set value of 20mm, the arc scrapers can be replaced to avoid affecting normal scraping use; the scrapers located in the outer peripheral scraping track are generally more severely worn, and therefore need to be particularly monitored in real time.

[0063] Wherein, referring to Figures 3-4 As shown, the main spoke 3 is provided with a plurality of installation grooves corresponding to a plurality of cutting tools 5, and each cutting tool 5 comprises a tool box 501 fixed in the corresponding installation groove, a tool seat 503 inserted into the tool box 501, and a tool body 502 fixed to the tool seat 503 and extending out of the tool box 501.

[0064] Each cutting tool 5 further comprises a fastener 504 for fixing the tool seat 503 and the tool box 501.

[0065] Specifically, referring to Figures 5-8 As shown, the fastener 504 comprises an installation port 5041, two tensioning ports 5047, two limiting blocks 5032, two wedge groove groups, two wedge block groups, two veneer groups, and two tensioning blocks 5042.

[0066] The installation port 5041 penetrates along the width direction of the tool box 501 and is provided for the insertion of the tool seat 503, the two tensioning ports 5047 are respectively provided on the opposite inner walls of the installation port 5041, the two limiting blocks 5032 are respectively arranged on the two sides of the tool seat 503 and are respectively embedded in a part of the two tensioning ports 5047, each wedge groove group comprises two wedge grooves, and the two wedge grooves are respectively provided on the opposite inner walls of the same tensioning port 5047, each veneer group comprises two veneers, and the two veneers are respectively formed on the two sides of the same limiting block 5032 facing the two wedge grooves, each wedge block group comprises two wedge blocks 5048, and the two wedge blocks 5048 are respectively embedded in the two wedge grooves in the same tensioning port 5047 for tightly abutting the veneers, and the two tensioning blocks 5042 are respectively embedded in another part of the two tensioning ports 5047 for tightly abutting the limiting blocks 5032.

[0067] The fastener 504 further comprises two first fixing members for connecting and fixing the two limiting blocks 5032 with the two tension blocks 5042 respectively, each of the first fixing members comprising a first bolt 5046, a stop washer 5044, a second threaded hole 5045 penetrating through the thickness direction of the stop washer 5044, a first threaded hole 5043 penetrating through the height direction of the tension block 5042, and a third threaded hole 5031 arranged on the limiting block 5032; the first bolt 5046 penetrates through the second threaded hole 5045, the first threaded hole 5043 and the third threaded hole 5031 in sequence to realize the connection and fixation of the limiting block 5032 with the tension block 5042.

[0068] The fastener 504 further comprises four second fixing members for fixing the four wedge blocks 5048 in the four wedge grooves respectively, each of the second fixing members comprising a second bolt 5049, a fourth threaded hole penetrating through the length direction of the wedge block 5048, and a fifth threaded hole arranged on the inner wall of the wedge groove, the second bolt 5049 being matched with the fourth threaded hole to facilitate the dismounting of the wedge block 5048.

[0069] Further, referring to Figure 6 As shown in the figure, the side of the wedge block 5048 facing the tensioning port 5047 is provided with a limiting groove, and the two sides of the tension block 5042 are fixed with limiting strips embedded in the limiting grooves respectively, so that when the wedge block 5048 is fixed and the tension block 5042 is installed, the transverse movement of the tension block 5042 can be avoided, and the second bolt 5049 is used for dismounting the wedge block 5048 to facilitate the grasping of the wedge block 5048; the wedge block 5048 is fixed by the tension block 5042 after being embedded in the limiting groove.

[0070] A long-distance tunneling cutter head capable of cutting piles in soft soil layers, comprising the following steps:

[0071] S1, starting the rotation and advancement of the tunneling cutter head to drive the first tearing cutter, the second tearing cutter 6 and the fish tail cutter 2 to cut the soil and the pile body in advance, and drive the first scraping cutter 7 to scrape and peel the cut soil and pile body;

[0072] S2, during the rotation and advancement of the tunneling cutter head, the first wear monitor 11 is used for monitoring, and when a signal of replacing the cutting cutter 5 is received from the first wear monitor 11, the tunneling cutter head is controlled to stop;

[0073] S3, replacing the first tearing cutter with a rolling cutter, and then returning to step S1.

[0074] The spoke assembly further comprises a plurality of sub-spokes 4, which are arranged alternately with the plurality of main spokes 3 along the periphery of the disc surface of the disc body 1, and a plurality of third tear knives 8 are fixed on each sub-spoke 4 along the length direction at intervals, and the height of the third tear knives 8 is consistent with the height of the second tear knives 6; a plurality of second scrapers 9 are arranged at intervals on the side of the sub-spoke 4 facing the main spoke 3, and the height of the second scrapers 9 is consistent with the height of the first scrapers 7;

[0075] In the step S1, the third tear knives 8 cut the soil and the pile body together with the first tear knives, the second tear knives 6 and the fishtail knives 2, and the second scrapers 9 scrape and peel the cut soil and pile body together with the first scrapers 7.

[0076] The tunneling cutter head further comprises a third wear monitor group, which is fixed to the main spoke 3 at the end close to the periphery of the disc body 1;

[0077] In the process of rotating and advancing of the tunneling cutter head, the third wear monitor group is used to monitor the wear of any one of the first scrapers 7 on the main spoke 3 close to the periphery of the disc body 1 and the second scrapers 9 on the sub-spoke 4 close to the periphery of the disc body 1, and an alarm is given when the third wear monitor group monitors that the wear of any one exceeds the second set value;

[0078] After receiving the alarm signal of the third wear monitor group, the tunneling cutter head is controlled to stop;

[0079] The first scrapers 7 on the main spoke 3 close to the periphery of the disc body 1 and the second scrapers 9 on the sub-spoke 4 close to the periphery of the disc body 1 are replaced, and then the step S1 is returned.

[0080] It should be noted that, in the present document, the terms such as first and second are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between such entities or operations. Also, the terms “comprises”, “comprising”, or any other variations thereof are intended to cover a non-exclusive inclusion, so that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0081] The above embodiments of the present application are described in detail in combination with the drawings, and those skilled in the art can make various changes to the present application according to the above description. Therefore, some details in the embodiments should not constitute a limitation on the present application, and the scope of protection of the present application will be defined by the appended claims.

Claims

1. A long distance tunneling cutter head capable of cutting piles in soft soil layers, characterized in that, The tunneling cutter head comprises a disc body, a fishtail knife fixed at the center of the disc surface of the disc body, a spoke assembly fixed on the disc surface of the disc body, a plurality of main spokes arranged on the disc surface of the disc body in a diverging manner from the center of the disc surface, a plurality of cutting tool groups arranged on the main spokes respectively, each of the cutting tool groups comprising a plurality of cutting tools arranged along the length direction of the corresponding main spoke, the cutting tools comprising a hobbing tool and a first tearing tool and being detachably connected to the corresponding main spoke, a plurality of second tearing tool groups fixed on the main spokes respectively, each of the second tearing tool groups comprising a plurality of second tearing tools arranged alternately with the plurality of cutting tools on the same main spoke, the height of the cutting tools, the height of the second tearing tools and the height of the fishtail knife being consistent for synchronous cutting of the soil and the pile, a plurality of scraper groups fixed on one side of the main spokes towards the adjacent main spokes, each of the scraper groups comprising a plurality of first scrapers arranged at intervals, the height of the first scrapers being lower than the height of the cutting tools for scraping and peeling the cut soil and pile, and a plurality of first wear monitors fixed on the main spokes for monitoring whether the wear of the first scrapers exceeds a first set value and sending a signal for replacing the cutting tools when the wear of the first scrapers exceeds the first set value. The spoke assembly further comprises a plurality of secondary spokes arranged along the periphery of the disc surface of the disc body and arranged alternately with the plurality of main spokes for making up the cutting gap between the adjacent main spokes, a plurality of third tearing tools fixed on each of the secondary spokes along the length direction, the height of the third tearing tools being consistent with the height of the second tearing tools, a plurality of second scrapers arranged at intervals on one side of the secondary spokes towards the main spokes, the height of the second scrapers being consistent with the height of the first scrapers, and an interval between each of the secondary spokes and the center of the disc surface of the disc body, a plurality of fourth tearing tools fixed in the interval, the plurality of fourth tearing tools being linearly arranged with the plurality of third tearing tools on the same secondary spoke, the height of the fourth tearing tools being consistent with the height of the third tearing tools. The tunneling cutter head further comprises a third wear monitor group for monitoring whether the wear of any one of the first scrapers close to the periphery of the disc body on the main spokes and the second scrapers close to the periphery of the disc body on the secondary spokes exceeds a second set value and sending an alarm when the wear exceeds the second set value, the third wear monitor group being fixed on one end of the main spokes close to the periphery of the disc body. The first wear monitor can also be used for monitoring whether the wear of the second scrapers exceeds the first set value and sending the signal for replacing the cutting tools when the wear of any one of the first scrapers and the second scrapers exceeds the first set value. The tunneling cutter head further comprises a second wear monitor for monitoring whether the disc surface of the disc body is worn and sending an alarm when the disc surface is worn, the second wear monitor being fixed on the main spokes. ​ ​ ​ ​ ​ ​ ​ 2. The long distance tunneling cutter head capable of cutting piles in soft soil layers according to claim 1, characterized in that, ​ 3. The long distance digging cutter head capable of cutting piles in soft soil layers according to claim 1, characterized in that, ​ 4. The long distance digging cutter head capable of cutting piles in soft soil layers according to claim 1, characterized in that, The main spoke is provided with a plurality of installation slots corresponding to a plurality of cutting tools, each of the cutting tools comprises a cutter box fixed in the corresponding installation slot, a cutter seat inserted into the cutter box, and a cutter body fixed to the cutter seat and extending out of the cutter box; Each of the cutting tools further comprises a fastener for fixing the cutter seat and the cutter box.

5. A method of tunneling using the long distance tunneling cutter head capable of cutting piles in soft ground layers according to claim 1, characterized in that, The method comprises the following steps: S1, starting the rotation and propulsion of the tunneling cutter head to drive the first tearing tools, the second tearing tools and the fish tail tools to cut the soil and the pile body in advance, and to drive the first scraping tools to scrape and peel the cut soil and pile body; S2, monitoring the first wear monitor during the rotation and propulsion of the tunneling cutter head, and stopping the tunneling cutter head when receiving the signal of replacing the cutting tools from the first wear monitor; S3, replacing the first tearing tools with the rolling cutter, and returning to step S1; During the execution of step S1, the third tearing tool cuts the soil and the pile body together with the first tearing tool, the second tearing tool and the fish tail tool, and the second scraping tool scrapes and peels the cut soil and pile body together with the first scraping tool; During the rotation and propulsion of the tunneling cutter head, the third wear monitor group monitors the wear of any one of the first scraping tools near the periphery of the disc body on the main spoke and the second scraping tools near the periphery of the disc body on the auxiliary spoke, and alarms when the wear of any one exceeds the second set value; After receiving the alarm signal of the third wear monitor group, the tunneling cutter head is stopped; The first scraping tools near the periphery of the disc body on the main spoke and the second scraping tools near the periphery of the disc body on the auxiliary spoke are replaced, and then the step S1 is returned.

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