A shield type circulating pre-support shield equipment for soft soil surrounding rock tunnel

Abstract

The present invention belongs to the technical field of tunnel construction, and specifically relates to a shield-type cyclic pre-support shield equipment for soft soil surrounding rock tunnels, equipment body; support ring, which includes a support shell for supporting the tunnel and an inner cross brace and a frame for reinforcing the support shell, and the two end faces of the support shell are fixedly embedded with an extended connecting plate for splicing the head and the tail; a jacking system, which is used to push the equipment body and the support ring into the tunnel; wherein a clamping system for splicing each other is provided between the equipment body and the support ring and between the two end faces of the support ring, and adjacent support rings are spliced ​​by the clamping system to gradually increase the support length through a segmented structure. The present invention can simultaneously support during the process of tunnel excavation and continuously extend the support length in a cycle, improve work efficiency, and reduce engineering workload. It is a technical measure and equipment that integrates simplicity, high efficiency, and environmental protection.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a shield-type circulating pre-support shield equipment for a soft soil surrounding rock tunnel. Background Art

[0002] The construction of tunnels and the development of underground space in complex geological and urban environments are very likely to induce accidents such as surface collapse, structure settlement, and road damage. Especially in the development of urban underground space, the social impact and destructive power caused by these accidents are very large. These accidents are caused by the displacement changes of the surrounding rock within 1.5 times the tunnel diameter of the tunnel face. The engineering community has many methods and technical measures to control the displacement and deformation of the surrounding rock in front of the tunnel face, such as:

[0003] Advance support: By setting up advance support measures such as face anchors and pipe sheds, the deformation of the surrounding rock in front of the face can be effectively controlled. These measures can enhance the stability of the surrounding rock in advance and reduce the advance displacement caused by excavation.

[0004] Face anchor reinforcement: Face anchor is an effective pre-reinforcement technology that can control the pre-displacement and face displacement after surrounding rock excavation, creating conditions for large-section excavation. The length of face anchor is generally between 10 and 20 meters, and glass fiber anchors that are easy to cut should be used first.

[0005] Pipe-roof support: Before tunnel excavation, steel pipes are driven into the stratum in front of the tunnel face and grouting is performed so that the stratum and the steel pipes together form a bearing structure that can transfer the load to a larger area of ​​soil in front of the tunnel face, thereby reducing the deformation of the surrounding rock at the tunnel face.

[0006] Strengthening of initial support: Initial support, such as shotcrete and steel support, should be carried out promptly after tunnel excavation to enhance the self-bearing capacity of the surrounding rock and control the deformation of the surrounding rock behind the face.

[0007] Full-section pre-reinforcement method: For example, the full-section pre-reinforcement method can significantly control the deformation of the surrounding rock by pre-reinforcing the core soil in advance to improve the strength and stiffness of the core soil to be excavated.

[0008] However, these methods are relatively large in engineering workload and require various preparatory work before construction. At the same time, the tunnel needs to be continuously reinforced during the process of advancement. The construction efficiency is low, the investment is large, and it is not convenient to construct in a small space.

[0009] The country is vigorously developing underground space, such as rail transit, municipal facilities, civil air defense projects, underground pipe networks, etc. Due to the diversity of the depth, geology and hydrology, scale, structure and function of the proposed underground projects, the differences in the ground environment and underground geological conditions, and the different requirements for construction control, and limited by the existing construction technology and technical level, the construction methods of underground projects are diverse, and their advancement, safety and economy vary.

[0010] In addition, with the increasing requirements for safe and civilized construction and the urgent need to increase the mechanized construction rate, the space for the continued development of some backward construction methods and equipment is getting smaller and smaller. A technical measure and equipment that is simple, efficient and environmentally friendly is needed, which should have both the function of advanced pre-support and the function of primary support structure installation. Summary of the invention

[0011] The purpose of the present invention is to provide a shield-type circulating pre-support shield equipment for a soft soil surrounding rock tunnel, which can simultaneously carry out support during the tunnel excavation and advancement process, and continuously extend the support length in a cycle, thereby improving work efficiency and reducing the amount of engineering work. It is a technical measure and equipment that integrates simplicity, high efficiency and environmental protection.

[0012] The technical solution adopted by the present invention is as follows:

[0013] A shield type circulating pre-support shield equipment for a soft soil surrounding rock tunnel, comprising:

[0014] Equipment body;

[0015] A support ring, comprising a support shell for supporting the tunnel and an inner cross brace and a frame for reinforcing the support shell, wherein both end surfaces of the support shell are fixedly embedded with an extended connecting plate for connecting the head and the tail;

[0016] A jacking system, used to push the equipment body and the support ring into the tunnel, comprising a jacking cylinder and a transmission frame fixedly mounted on the power output end of the jacking cylinder;

[0017] Wherein, a clamping system for mutual splicing is provided between the equipment body and the support ring and between the two end surfaces of the support ring, and adjacent support rings are spliced ​​by using the clamping system to gradually increase the support length through a segmented structure and gradually advance into the tunnel;

[0018] The clamping system comprises a clamping end and a clamping plate which are adapted to be clamped to each other. The clamping end and the clamping plate are respectively installed on two end faces of the support ring. The clamping plate is installed on the end face of the equipment body close to the support ring.

[0019] As a preferred solution, the equipment body includes a drilling shell, a cutting disc rotatably mounted on the propulsion end of the drilling shell, an auger rod fixedly mounted with the cutting disc, and a servo motor fixedly mounted in the equipment body. The servo motor is connected to the auger rod through a reducer to drive the cutting disc and the auger rod to move synchronously. Blades are fixedly welded at the four corners of the propulsion end of the drilling shell.

[0020] As a preferred solution, first bolt holes for mutual connection are evenly opened on the surface of the extension connection plate, the inner cross brace is made of channel steel, and the frame and the extension connection plate are both made of steel plates.

[0021] As a preferred solution, it also includes a top iron, which includes an inner frame and a reinforcing cross brace vertically welded together, and an outer panel is fixedly welded to the two end faces of the inner frame and the reinforcing cross brace, and an angle iron for reinforcement is fixedly welded between the inner frame and the outer panel, a hollow through groove is opened through the outer panel, and second bolt holes for mutual connection are evenly opened on the edge, and a track slot for advancing positioning is opened symmetrically through the bottom surface of the outer panel laterally.

[0022] As a preferred embodiment, the clamping end includes a conical head and a connecting seat, the conical head is provided with a spiral groove, and the center is provided with a threaded through groove, the connecting seat is integrally formed with a bolt rod matching the threaded through groove, the connecting seat is fixedly provided with an annular washer near one end of the bolt rod to form an annular clamping groove between the connecting seat and the conical head, the connecting seat is provided with an annular connecting groove at one end away from the bolt rod, and a bearing is fixedly provided inside the connecting seat.

[0023] As a preferred solution, a connecting through hole with the same maximum diameter as the conical head is opened through the center of the clamping plate, a positioning pin head is protruded from the inner wall of the connecting through hole, and a third bolt hole for connection is opened at the edge of the clamping plate.

[0024] As a preferred solution, it also includes a slag discharge system for transporting slag that runs through the equipment body and the support ring, which includes a slag discharge trolley and tracks laid at the bottom of the equipment body and the support ring. A continuously extendable steel cable is suspended between the slag discharge trolley and the transmission frame, so that the slag discharge trolley can be pulled by the jacking cylinder to move on the track.

[0025] As a preferred solution, the slag hopper vehicle includes a bottom support plate and a slag hopper placed on the bottom support plate, positioning columns for limiting the slag hopper are fixedly welded at the four corners of the top surface of the bottom support plate, track wheels compatible with the track are fixedly installed at the four corners of the bottom surface of the bottom support plate, and a pull ring for bolting the steel cable is integrally formed at one end of the bottom support plate.

[0026] As a preferred solution, the track consists of three sections: a limiting section, a power-assisting section and an extension section. The extension section can be continuously extended by means of a threaded connection. The limiting section is laid at the discharge port inside the equipment body, and is bent at one end away from the power-assisting section to form a limiting elbow, so as to limit the position of the slag bucket car to receive the slag through the limiting elbow and the power-assisting section.

[0027] As a preferred solution, at least four groups of the jacking cylinders are provided, and are fixed to each other via metal frames, and the transmission frame is fixedly installed between the power output ends.

[0028] The technical effects achieved by the present invention are:

[0029] The present invention cooperates with an equipment body, a support ring and a jacking system, and utilizes the jacking system to continuously push the equipment body and the support ring into the tunnel to be excavated, and excavates the tunnel through the equipment body. At the same time, the support ring completes the support of the excavated tunnel, and in the process of continuous excavation, support rings can be continuously added in sections to form a cyclically lengthened support structure, thereby improving the support capacity. Compared with the prior art, no preliminary support preparation work is required, and support is carried out simultaneously during the excavation process. The support structure is stable, and it integrates simplicity, high efficiency and environmental protection, and is convenient for construction in a small space.

[0030] The present invention provides a snap-on system between the equipment body and the support ring and between adjacent support rings. In the process of mutual advancement, the relative rotation and snap-on between the spiral groove and the positioning pin head can be used to automatically position and connect them, so that they can be stably connected to each other and accurately aligned, thereby making the overall stability of the support structure better and the integrity higher. After use, the support structure can be disassembled or re-tightened without affecting reuse, which is very convenient and environmentally friendly.

[0031] The present invention provides a slag discharge system between the equipment body and the support ring, which can continuously take on slag during the advancement process, and at the same time use the return power of the jacking cylinder after the advancement is completed to pull the slag bucket car, so that after passing the power-assisting section on the track, the slag bucket car can automatically slide out of the tunnel using its own gravitational potential energy. No external power equipment is required, resource utilization is improved, energy damage is reduced, the structural design is reasonable, and it is more in line with the design concept of simplicity, efficiency, and environmental protection, which is convenient for construction in a small space. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic diagram of the three-dimensional structure of an embodiment of the present invention;

[0033] Figure 2 is a top view of an embodiment of the present invention;

[0034] Figure 3 The present invention Figure 2 AA cross-sectional view;

[0035] Figure 4 is a schematic diagram of the three-dimensional structure of one side of the device body in an embodiment of the present invention;

[0036] Figure 5 is a schematic diagram of the three-dimensional structure of the other side of the device body in an embodiment of the present invention;

[0037] Figure 6 is a schematic diagram of the three-dimensional structure of one side of the support ring in an embodiment of the present invention;

[0038] Figure 7 is a schematic diagram of the three-dimensional structure of the other side of the support ring in an embodiment of the present invention;

[0039] Figure 8 The present invention Figure 6 A magnified view of the part in the middle;

[0040] Fig. 9 The present invention Figure 7 A magnified view of the part in middle B;

[0041] Fig.10 is a schematic diagram of the three-dimensional structure of one side of the clamping terminal in an embodiment of the present invention;

[0042] Fig.11 is a schematic diagram of the three-dimensional structure of the other side of the clamping terminal in an embodiment of the present invention;

[0043] Fig.12 is an exploded view of a clamping terminal in an embodiment of the present invention;

[0044] Fig.13 Schematic diagram of the three-dimensional structure of the top iron in the embodiment of the present invention;

[0045] Fig.14 2 is a schematic diagram of the three-dimensional structure of the jacking system in an embodiment of the present invention;

[0046] Fig.15 Schematic diagram of the connection structure between the slag discharge system and the jacking system in an embodiment of the present invention;

[0047] Fig.16 Schematic diagram of the three-dimensional structure of the slag bucket car in the embodiment of the present invention;

[0048] Fig.17 It is a schematic diagram of the three-dimensional structure of the track in an embodiment of the present invention.

[0049] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0050] 1. Equipment body;

[0051] 11. Drilling shell; 12. Cutting disc; 13. Auger rod; 14. Servo motor; 15. Shovel blade;

[0052] 2. Support ring;

[0053] 21. Support shell; 22. Inner cross brace; 23. Frame; 24. Outer connecting plate; 25. First bolt hole;

[0054] 3. Top iron;

[0055] 31. Inner frame; 32. Reinforced cross brace; 33. Angle iron; 34. Outer panel; 35. Second bolt hole; 36. Hollow through groove; 37. Track slot;

[0056] 4. Jacking system;

[0057] 41. Push-in cylinder; 42. Transmission frame;

[0058] 5. Card connection system;

[0059] 51. Snap-fit ​​end; 511. Conical head; 512. Spiral groove; 513. Threaded through groove; 514. Connecting seat; 515. Bolt rod; 516. Annular washer; 517. Annular connecting groove; 518. Bearing;

[0060] 52, snap-on plate; 521, connecting through hole; 522, positioning pin head; 523, third bolt hole;

[0061] 6. Slag discharge system;

[0062] 61. Slag bucket car; 611. Bottom support plate; 612. Positioning column; 613. Track wheel; 614. Pull ring; 615. Slag bucket;

[0063] 62, track; 621, limit section; 622, power section; 623, extension section; 624, limit elbow;

[0064] 63. Steel cable. DETAILED DESCRIPTION

[0065] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific embodiments of the present invention, and does not strictly limit the scope of protection of the specific claims of the present invention.

[0066] like Figure 1-Figure 17As shown, a shield-type circulating pre-support shield equipment for a soft soil surrounding rock tunnel includes an equipment body 1 for excavating the tunnel, a supporting ring 2 spliced ​​with the equipment body 1 for supporting the tunnel, and a jacking system 4 for synchronously pushing the equipment body 1 and the supporting ring 2 into the tunnel. At the same time, a jacking iron 3 for pushing positioning and buffering is also provided between the jacking system 4 and the supporting ring 2.

[0067] During excavation, the equipment body 1 is placed at the tunnel entrance, and the jacking system 4 is used in conjunction with the top iron 3 to advance the equipment body 1 into the tunnel to a depth of one body position to complete the excavation of that length. Then, the support ring 2 is extended and placed behind the equipment body 1, and then the jacking system 4 is used in conjunction with the top iron 3 to advance the support ring 2 into the tunnel to a depth of one body position. At the same time, the support ring 2 is used to support the excavated part, and then the support ring 2 is placed in a cycle and continuously advanced into the tunnel until the excavation of the entire tunnel is completed, thereby forming a circulation and support structure in the process of excavation to form complete support for the tunnel.

[0068] See attached Figure 3-Figure 5 The equipment body 1 includes a drilling shell 11, a cutting disc 12 rotatably mounted on the propulsion end of the drilling shell 11, an auger rod 13 fixedly mounted with the cutting disc 12, and a servo motor 14 fixedly mounted in the equipment body 1. The servo motor 14 is connected to the auger rod 13 through a reducer to drive the cutting disc 12 and the auger rod 13 to move synchronously, thereby continuously excavating the tunnel during the propulsion process. At the same time, the auger rod 13 continuously outputs the slag for easy transportation. At the same time, the drilling shell 11 can form preliminary support to avoid collapse, so as to facilitate the subsequent propulsion of the support ring 2. By fixing and welding blades 15 at the four corners of the propulsion end of the drilling shell 11, the propulsion efficiency can be improved, and the slag at the edge can be cleaned up.

[0069] In this embodiment, two groups of servo motors 14 are provided, with power: 37KW*2; reducer speed ratio: I=42.5; power head speed ratio: I=48 / 19=2.52; total speed ratio: I=42.5*2.52=107.2; at the same time, the reducer output speed: N=13r / min; the reducer output torque: T=55KNM.

[0070] See attached Figure 6-Figure 7 The support ring 2 includes a support shell 21 for supporting the tunnel and an inner cross brace 22 and a frame 23 for reinforcing the support shell 21. The two are welded and fixed to each other. The frame 23 forms a frame on the support shell 21, and the inner cross brace 22 forms a support frame on the inner wall of the support shell 21, so as to cooperate with each other to improve the support strength. At the same time, the two end surfaces of the support shell 21 are fixedly embedded with extended connecting plates 24 for head-to-tail splicing, which facilitates the mutual docking between adjacent support rings 2.

[0071] Furthermore, first bolt holes 25 for mutual connection are evenly opened on the surface of the extended connecting plate 24, so that after the tunnel excavation is completed, two adjacent support rings 2 can be spliced ​​into one through the first bolt holes 25 and bolts, thereby improving the integrity of the support structure and increasing the strength of the mutually spliced ​​supports.

[0072] In this embodiment, the inner cross brace 22 is made of channel steel, and the frame 23 and the outer connecting plate 24 are both made of steel plates. By utilizing their good welding, riveting performance and comprehensive mechanical properties, as well as their unique structure, they can withstand greater pressure and weight, thereby better supporting the tunnel.

[0073] See attached Figure 3 as well as Fig.14 The jacking system 4 includes a jacking cylinder 41 and a transmission frame 42 fixedly installed on the power output end of the jacking cylinder 41. The jacking cylinder 41 can be gradually extended to push the equipment body 1 and the support ring 2 into the tunnel. At the same time, the setting of the transmission frame 42 can evenly transmit the driving power to the equipment body 1 and the support ring 2, so that the pushing direction is more accurate and the process is smoother, avoiding the occurrence of inconsistent pushing progress.

[0074] Among them, in this embodiment, four groups of jacking cylinders 41 are provided, and they are fixed to each other through metal frames. The transmission frame 42 is fixedly installed between each power output end to balance the propulsion power between each jacking cylinder 41; of course, in other embodiments, at least four groups of jacking cylinders 41 are provided, and construction personnel can choose according to specific construction requirements.

[0075] See attached Figure 3 as well as Fig.13 In order to make the pushing process more stable and avoid damaging the equipment body 1 and the support ring 2, a top iron 3 is also provided in this embodiment, which includes an inner frame 31 and a reinforcing cross brace 32 vertically welded together to form a pushing buffer frame, and an outer panel 34 is fixedly welded on the two end faces of the inner frame 31 and the reinforcing cross brace 32 to make the surface that fits with the equipment on both sides smoother to avoid excessive relative force damaging the contact surface. At the same time, an angle iron 33 for reinforcement is fixedly welded between the inner frame 31 and the outer panel 34 to reinforce the connection structure between the outer panel 34 and the inner frame 31 to avoid deformation under great pressure.

[0076] Of course, in other embodiments, the top iron 3 may not be provided, and the construction personnel may make a choice according to specific construction requirements.

[0077] Secondly, second bolt holes 35 for mutual connection are evenly opened on the edge of the outer panel 34, which are used to cooperate with the first bolt holes 25 to connect the supporting rings 2 that fit therewith to each other, so as to facilitate a higher synchronization rate during the advancement process, and a hollow through groove 36 is opened through the outer panel 34 to facilitate the staff to pass through and discharge waste materials such as slag to the outside, and a track slot 37 for advancement positioning is opened through the bottom surface of the outer panel 34 in a transversely symmetrical manner, and a positioning advancement track is laid on its bottom surface to match it, so that they can engage with each other, and when the equipment body 1 and the support ring 2 are advanced, they can move along the established track, and the advancement direction is more controllable and the advancement is more precise.

[0078] In this embodiment, the inner frame 31 and the reinforcing cross brace 32 are made of channel steel, and the outer panel 34 is made of steel plate. Its unique structure can be used to enable it to withstand greater pressure and weight, and thus will not easily deform during the advancement process.

[0079] See attached Figure 3 as well as Figure 5-Figure 7 In order to make the mutual splicing between the equipment body 1 and the supporting ring 2 more stable and the docking positioning more accurate, a clamping system 5 for mutual splicing is provided between the equipment body 1 and the supporting ring 2 and between the two end surfaces of the supporting ring 2, which includes a clamping end 51 and a clamping plate 52 that are adapted to be clamped to each other.

[0080] Please refer to the attached Figure 9-12 A connecting through hole 521 is formed through the center of the clamping plate 52 , and a positioning pin head 522 is protruded from the inner wall of the connecting through hole 521 .

[0081] Secondly, the clamping end 51 includes a conical head 511 and a connecting seat 514. The maximum diameter of the conical head 511 is the same as the inner diameter of the connecting through hole 521. During the process of gradually advancing the conical head 511 into the connecting through hole 521, the edges of the two can gradually fit each other until they are fully engaged, and the splicing positioning is gradually completed. The conical head 511 is provided with a spiral groove 512, and the positioning pin head 522 can be embedded in the spiral groove 512 during the process of advancing the engagement, thereby pushing the conical head 511 to rotate as a whole, so as not to The engagement position is constantly changed, and at the same time, an annular gasket 516 is fixedly installed on the connecting seat 514 near one end of the bolt rod 515 to form an annular groove between the connecting seat 514 and the conical head 511. After the connecting through hole 521 and the conical head 511 are fully engaged, the positioning pin head 522 is embedded in the annular groove to form a hanging structure, so that the conical head 511 can no longer be correctly separated along the spiral groove 512, thereby completing the automatic mutual engagement of the two, and after the engagement, the separation cannot be restored, thereby ensuring the stability of the engagement.

[0082] Furthermore, a threaded through groove 513 is opened in the center of the conical head 511, and a bolt rod 515 matching the threaded through groove 513 is integrally formed on the connecting seat 514. The two are connected by threads, and manual intervention can be performed after the tunnel excavation is completed to split or tighten them again as needed.

[0083] Furthermore, a third bolt hole 523 for connection is provided on the edge of the clamping plate 52, which is used to cooperate with the second bolt hole 35 and the first bolt hole 25, so that the mutually fitted parts can be reinforced for a second time by bolts, or after the tunnel is excavated, the adjacent support rings 2 can be fixedly connected to form a complete support shield structure.

[0084] Please refer to the attached Figure 6-Figure 7 The connecting seat 514 is provided with an annular connecting groove 517 at one end away from the bolt rod 515, and a bearing 518 is fixedly installed inside the connecting seat 514, which is rotatably connected to the four corners of the extended connecting plate 24 of one end face of the support ring 2. At the same time, the outer fixing plate is fixed with screws. When necessary, the connecting seat 514 can be removed from the extended connecting plate 24 by removing the outer fixing plate; and the clamping plate 52 is fixedly welded to the four corners of the other end face of the support ring 2 to correspond to the clamping end 51; so that the clamping end 51 cooperates with the clamping plate 52, when the two groups of support rings 2 are butt-jointed, by inserting the conical head 511 into the connecting through hole 521 During the gradual advancement inside, the edges of the two can gradually fit together until they are fully engaged, and the splicing positioning is gradually completed. At the same time, during the process of engagement and advancement, the positioning pin head 522 is embedded in the spiral groove 512, thereby pushing the conical head 511 to rotate as a whole to continuously change the engagement orientation. After the connecting through hole 521 and the conical head 511 are fully engaged, the positioning pin head 522 is embedded in the annular groove to form a hanging structure, so that the two sets of support rings 2 can be connected and engaged with each other, and then the snap-on system 5 is used for splicing to gradually increase the support length through the segmented structure, and gradually advance into the tunnel to form a complete support for the tunnel.

[0085] Please refer to the attached Figure 5 In this embodiment, a clamping plate 52 is installed on the end face of the equipment body 1 close to the support ring 2, and is fixedly welded to the four corners of the drilling shell 11; in this way, when the equipment body 1 and the support ring 2 are synchronously advanced, the clamping end 51 and the clamping plate 52 can be used to cooperate with each other, and the positioning and clamping are performed according to the above method to ensure the connection stability, further ensure the consistency of advancement, and make the tunnel excavation more stable. Of course, in other embodiments, the clamping plate 52 may not be set on the equipment body 1, or only at least one group of clamping plates 52 may be set, and the construction personnel can choose according to the specific construction needs.

[0086] See attached Figure 3 as well as Figure 15-17In order to clear the slag during the tunnel excavation process, a slag discharge system 6 for slag transportation is also passed through between the equipment body 1 and the support ring 2, which includes a slag discharge trolley 61 and a track 62 laid at the bottom of the equipment body 1 and the support ring 2. A continuously extendable steel cable 63 is suspended between the slag discharge trolley 61 and the transmission frame 42, so that the slag discharge trolley 61 is pulled by the jacking cylinder 41 to move on the track 62, and the length of the steel cable 63 can be continuously extended according to the number of support rings 2 to match the changes in tunnel depth and stroke length during the continuous excavation process.

[0087] In this embodiment, the track 62 is fixedly laid on the bottom surface of the equipment body 1 and the inner side of the support ring 2 by welding, and the cross section of the track 62 is circular, which can reduce the friction when traveling. Of course, it can also be laid by bundling or grooving, and then removed after the tunnel excavation is completed.

[0088] Please refer to the attached Fig.16 The slag hopper car 61 includes a bottom support plate 611 and a slag hopper 615 placed on the bottom support plate 611. Positioning columns 612 for limiting the slag hopper 615 are fixedly welded at the four corners of the top surface of the bottom support plate 611, so that the slag hopper 615 can be split up and down from the bottom support plate 611 as needed. At the same time, track wheels 613 compatible with the track 62 are fixedly installed at the four corners of the bottom surface of the bottom support plate 611, so that it can stably move along the track 62. A pull ring 614 integrally formed at one end of the bottom support plate 611 can be used to bolt the steel cable 63, so that when the jacking cylinder 41 returns, the retraction force can be used to pull it along the track 62.

[0089] Please refer to the attached Fig.17The track 62 is composed of a limit section 621, a power section 622 and an extension section 623. The extension section 623 can be continuously extended by means of a threaded connection so as to extend its length and increase its stroke during the continuous excavation of the tunnel. The limit section 621 is laid at the discharge port inside the equipment body 1, that is, directly below the auger rod 13, and is bent at one end away from the power section 622 to form a limit elbow 624, so that the position of the slag bucket car 61 receiving the slag is limited by the limit elbow 624 and the power section 622, so that the slag bucket car 61 can only be located directly below the auger rod 13 In this way, the debris generated by excavation can be taken over. At the same time, the arc-shaped slope structure design of the assisting section 622 can pull the slag bucket car 61 over the top slope of the assisting section 622 when the jacking cylinder 41 returns, and then use its downward gravitational potential energy to push it to slide outward along the track 62, thereby outputting the debris. Thereafter, the slag storage bucket 615 is lifted up by the lifting equipment, and after the debris is cleaned, it is reset. Thereafter, the slag bucket car 61 is reset to between the limit elbow 624 and the assisting section 622 by manual or other power equipment, and the debris is continued to be taken over. This reciprocating process completes the removal of the debris.

[0090] The working principle of the present invention is as follows: first, the equipment body 1 is placed at the tunnel entrance, and the jacking system 4 is used to cooperate with the top iron 3 to push the equipment body 1 into the tunnel to a depth of one body position, so as to complete the excavation of the length, and then the support ring 2 is extended and placed behind the equipment body 1, and they are positioned and engaged with each other through the clamping system 5, and then the jacking system 4 is used to cooperate with the top iron 3 to push the support ring 2 into the tunnel to a depth of one body position, and at the same time, the support ring 2 is used to support the excavated part, and then the support ring 2 is placed cyclically, and the adjacent support rings 2 are positioned and engaged with each other by the clamping system 5, and are continuously pushed into the tunnel until the excavation of the entire tunnel is completed;

[0091] Secondly, during the excavation process, the slag bucket car 61 is used to receive the slag generated by tunnel excavation. After a support ring 2 is pushed, the jacking system 4 needs to perform a return movement. At this time, the return power of the jacking cylinder 41 can be used to pull the slag bucket car 61 over the top slope of the power-assisting section 622, and then use its downward gravitational potential energy to push it to slide outward along the track 62, and then output the slag. Then, the slag storage bucket 615 is lifted by the lifting equipment, and after the slag is cleaned, it is reset. Then, the slag bucket car 61 is reset to between the limit elbow 624 and the power-assisting section 622 by manual or other power equipment, and the slag continues to be received. This reciprocating process completes the removal of the slag.

[0092] Finally, after the tunnel excavation is completed, bolts can be used to fix them together through the first bolt holes 25 between adjacent support rings 2. At the same time, the conical head 511 and the connecting seat 514 are engaged in the connecting through hole 521. The threaded through groove 513 and the bolt rod 515 can be used to tighten the conical head 511 and the connecting seat 514 again to strengthen the connection between the adjacent support rings 2, or the conical head 511 and the connecting seat 514 can be removed from the support ring 2 for recycling.

[0093] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims

1. A shield type circulating pre-support shield equipment for soft soil surrounding rock tunnel, characterized in that: include: Equipment body (1); A support ring (2), comprising a support shell (21) for supporting a tunnel, and an inner cross brace (22) and a frame (23) for reinforcing the support shell (21), wherein both end surfaces of the support shell (21) are fixedly embedded with an extended connecting plate (24) for connecting the end and the end to each other; A jacking system (4) is used to push the equipment body (1) and the support ring (2) into the tunnel, and comprises a jacking cylinder (41) and a transmission frame (42) fixedly mounted on a power output end of the jacking cylinder (41); A clamping system (5) for mutual splicing is provided between the equipment body (1) and the support ring (2) and between the two end surfaces of the support ring (2); adjacent support rings (2) are spliced ​​together using the clamping system (5) to gradually increase the support length through a segmented structure and gradually advance into the tunnel; The clamping system (5) comprises a clamping end head (51) and a clamping plate (52) adapted to be clamped to each other, the clamping end head (51) and the clamping plate (52) being respectively mounted on two end faces of the support ring (2), and the clamping plate (52) is mounted on the end face of the equipment body (1) close to the support ring (2).

2. The soft soil surrounding rock tunnel shield type circulating pre-support shield equipment according to claim 1, characterized in that: The device body (1) comprises a drilling shell (11), a cutting disc (12) rotatably mounted on the propulsion end of the drilling shell (11), a spiral drill rod (13) fixedly mounted on the cutting disc (12), and a servo motor (14) fixedly mounted in the device body (1); the servo motor (14) is connected to the spiral drill rod (13) through a reducer for driving the cutting disc (12) and the spiral drill rod (13) to move synchronously; scrapers (15) are fixedly welded to the four corners of the propulsion end of the drilling shell (11).

3. The soft soil surrounding rock tunnel shield type circulating pre-support shield equipment according to claim 1, characterized in that: The surface of the extension connection plate (24) is evenly provided with first bolt holes (25) for mutual connection, the inner cross brace (22) is made of channel steel, and the frame (23) and the extension connection plate (24) are both made of steel plates.

4. The soft soil surrounding rock tunnel shield type circulating pre-support shield equipment according to claim 1, characterized in that: It also comprises a top iron (3), which comprises an inner frame (31) and a reinforcing cross brace (32) vertically welded together, and an outer panel (34) is fixedly welded to the two end surfaces of the inner frame (31) and the reinforcing cross brace (32), and an angle iron (33) for reinforcement is fixedly welded between the inner frame (31) and the outer panel (34), a hollow through groove (36) is formed through the outer panel (34), and second bolt holes (35) for mutual connection are evenly formed on the edge, and a track slot (37) for advancing positioning is formed through the bottom surface of the outer panel (34) in a transversely symmetrical manner.

5. The soft soil surrounding rock tunnel shield type circulating pre-support shield equipment according to claim 1, characterized in that: The clamping end (51) comprises a conical head (511) and a connecting seat (514); a spiral groove (512) is formed on the conical head (511), and a threaded through groove (513) is formed at the center; a bolt rod (515) matching the threaded through groove (513) is integrally formed on the connecting seat (514); an annular washer (516) is fixedly mounted on one end of the connecting seat (514) close to the bolt rod (515) to form an annular clamping groove between the connecting seat (514) and the conical head (511); an annular connecting groove (517) is formed on one end of the connecting seat (514) away from the bolt rod (515), and a bearing (518) is fixedly mounted therein.

6. The soft soil surrounding rock tunnel shield type circulating pre-support shield equipment according to claim 5, characterized in that: A connecting through hole (521) having the same maximum diameter as the conical head (511) is formed through the center of the clamping plate (52), a positioning pin head (522) is protruding from the inner wall of the connecting through hole (521), and a third bolt hole (523) for connection is formed on the edge of the clamping plate (52).

7. The soft soil surrounding rock tunnel shield type circulating pre-support shield equipment according to claim 1, characterized in that: It also includes a slag discharge system (6) for conveying slag and soil, which runs through the equipment body (1) and the support ring (2), and includes a slag discharge hopper car (61) and a track (62) laid on the bottom of the equipment body (1) and the support ring (2). A continuously extendable steel cable (63) is suspended between the slag discharge hopper car (61) and the transmission frame (42) so that the slag discharge hopper car (61) can be pulled by the push cylinder (41) to move on the track (62).

8. The soft soil surrounding rock tunnel shield type circulating pre-support shield equipment according to claim 7, characterized in that: The slag hopper vehicle (61) comprises a bottom support plate (611) and a slag hopper (615) placed on the bottom support plate (611); positioning columns (612) for defining the slag hopper (615) are fixedly welded at the four corners of the top surface of the bottom support plate (611); track wheels (613) adapted to the track (62) are fixedly installed at the four corners of the bottom surface of the bottom support plate (611); and a pull ring (614) for bolting the steel cable (63) is integrally formed at one end of the bottom support plate (611).

9. The soft soil surrounding rock tunnel shield type circulating pre-support shield equipment according to claim 7, characterized in that: The track (62) is composed of three sections, namely a limit section (621), an assist section (622) and an extension section (623); the extension section (623) is continuously extended by means of a threaded connection; the limit section (621) is laid at the discharge port inside the equipment body (1) and is bent at one end away from the assist section (622) to form a limit elbow (624), so that the position of the slag bucket car (61) receiving the slag is limited by the limit elbow (624) and the assist section (622).

10. The soft soil surrounding rock tunnel shield type circulating pre-support shield equipment according to claim 1, characterized in that: At least four groups of the push cylinders (41) are provided and are fixed to each other as a whole via metal frames, and the transmission frame (42) is fixedly installed between the power output ends.

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