Shield reaction device and shield starting operation method

Abstract

The present invention is applicable to the technical field of underground engineering, and provides a shield reaction device and a shield launching operation method. The shield reaction device includes: a support frame; a steel ring fixedly installed on the support frame; a reaction member, one end of the reaction member is obliquely inserted into the surrounding rock of the mined-out interval tunnel, and the other end of the reaction member is fixedly connected to the steel ring; a reference ring coaxially arranged with the steel ring and fixedly connected to the steel ring, and the reference ring is used to transmit the reaction thrust to the shield machine through the negative segment lining. Along the tunneling direction of the mined-out interval tunnel, the position where the reaction member is inserted into the surrounding rock is in front of the steel ring, and a plurality of reaction members are connected to the steel ring, and each reaction member is evenly distributed along the circumference of the steel ring. In the present invention, the shield reaction device can provide stable reaction thrust for the tunneling machine. Moreover, it will not damage the lining structure in the mined-out station, improving the safety of the mined-out station structure, with remarkable social and economic benefits and broad development prospects.

Description

Technical Field

[0001] The present invention belongs to the technical field of underground engineering, and particularly relates to a shield reaction device and a shield starting operation method. Background Art

[0002] Due to the advantages of mature technology, safety, speed, no need for dewatering, little impact on the surrounding environment during construction, and excellent quality of the formed tunnel, shield construction is widely used in the construction of urban rail transit underground interval tunnels. With the development of urban rail transit construction towards deeper depths, in recent years, deep buried and mined stations have emerged continuously in newly built urban rail transit. As a result, a "mined + shield" combined construction method has emerged, which uses a mined station as a shield starting or receiving site and then uses a shield to excavate the interval tunnel.

[0003] This construction method generally uses the ventilation shaft of the mined station as the access passage for shield starting and receiving. During construction, the main structures of the mined station and the ventilation shaft are constructed first, and the internal structure of the station is not constructed temporarily. Then, the shield machine is transferred into the ground through the station ventilation shaft for assembly, and then translated into the mined tunnel for shield starting. In actual projects, because the main structure of the station has been constructed, when starting the shield in the mined station, there are problems such as damage to the lining structure of the station during the erection of the reaction frame, potential quality hazards of the waterproof structure, and increased safety risks of the station structure. Summary of the Invention

[0004] In view of this, embodiments of the present invention provide a shield reaction device and a shield starting operation method to solve the problems of potential quality hazards of the waterproof structure and increased safety risks of the station structure caused by damage to the lining structure of the station during the erection of the reaction frame.

[0005] To solve the above problems, the technical solution of the embodiments of the present invention is realized as follows:

[0006] A shield reaction device is arranged in the mined interval tunnel in the mined station and includes: a support frame; a steel ring fixedly installed on the support frame; a reaction member, one end of which is obliquely inserted into the surrounding rock of the mined interval tunnel, and the other end of which is fixedly connected to the steel ring, and the reaction member is used to provide a reaction thrust to the shield machine starting the shield in the mined station; a reference ring coaxially arranged with the steel ring and fixedly connected to the steel ring, and the reference ring is used to transmit the reaction thrust to the shield machine through the negative segment lining; wherein, along the tunneling direction of the mined interval tunnel, the position where the reaction member is inserted into the surrounding rock is in front of the steel ring, and a plurality of the reaction members are connected to the steel ring, and each of the reaction members is evenly distributed along the circumference of the steel ring.

[0007] Preferably, the support frame includes: two columns, which are opposite to each other and vertically spaced apart; a first cross beam, the two ends of which are respectively fixedly connected to the two columns and are located at the upper ends of the two columns; a second cross beam, the two ends of which are respectively fixedly connected to the two columns and are located at the lower ends of the two columns; wherein, the steel ring is fixedly connected to at least the two columns through a first fastener.

[0008] Preferably, a plurality of connection holes for the first fastener to pass through are respectively provided on the two columns, and the connection holes are spaced apart along the height direction of the columns.

[0009] Preferably, the support frame further includes: a diagonal brace, which is respectively connected to the two columns and is located on the side opposite to the shield direction; wherein, one end of the diagonal brace is fixedly connected to the column, and the other end of the diagonal brace extends downward obliquely and is flush with the bottom end of the column.

[0010] Preferably, the steel ring includes: a body; special-shaped plates, which are fixedly connected to the opposite two surfaces of the body, and the two special-shaped plates are respectively used for fixedly connecting to the support frame and the reference ring; wherein, one end of the reaction member is connected to any one of the two special-shaped plates.

[0011] Preferably, the body includes a plurality of splicing blocks, and the splicing blocks are spliced with each other to form the body, and the splicing blocks are fixedly connected through a second fastener.

[0012] Preferably, the special-shaped plate includes a plurality of splicing plates, and the splicing plates are spliced with each other to form the special-shaped plate, and the splicing plates are connected to the corresponding splicing blocks.

[0013] Preferably, the reference ring includes a first surface and a second surface arranged oppositely, a first outer edge for connecting with the negative segment is arranged on the first surface, a second outer edge for connecting with the support frame is arranged on the second surface, and the diameter of the first outer edge is smaller than the diameter of the second outer edge.

[0014] The embodiment of the present invention further provides a shield starting operation method for operating the above shield reaction device for shield starting. The shield starting operation method includes: in the mined tunnel section, driving one end of the reaction member into the surrounding rock of the mined tunnel section, and hanging the other end of the installed reaction member on the side wall of the mined tunnel section; arranging the support frame at the tail of the shield machine, and successively installing the steel ring and the reference ring, then connecting the other end of the reaction member to the steel ring, and adjusting the reaction member to a tensioned state; arranging the negative segment lining between the shield machine and the reference ring, and keeping both ends of the negative segment lining in close contact with the reference ring and the shield machine respectively, and the shield starting operation is completed. Preferably, the shield starting operation method further includes: after arranging the support frame at the tail of the shield machine, jacks are arranged between the support frame and the surrounding rock, and the position of the support frame is controlled and stabilized by the jacks.

[0015] A shield reaction device provided by an embodiment of the present invention includes a support frame, a steel ring, a reaction member and a reference ring. The steel ring is fixed on the support frame, and the reference ring is fixedly connected to the steel ring. By inserting one end of the reaction member obliquely into the surrounding rock along the tunneling direction of the mined tunnel section and fixing it, and the other end of the reaction member is fixedly connected to the steel ring. In this way, the reaction member is obliquely arranged and fixedly connected in the surrounding rock, which can not only provide reliable tensile force to stabilize the position of the support frame and provide stable reaction thrust for the tunneling machine. Moreover, the obliquely arranged reaction member will not damage the lining structure in the mined station, so that the waterproof structure quality of the station can be kept reliable, stable waterproofing can be realized, the safety of the mined station structure is improved, and the social and economic benefits are remarkable, and the development prospect is broad. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention, and those skilled in the art can also obtain other drawings based on these drawings without creative efforts.

[0017] Figure 1 is a schematic structural view of the shield reaction device provided by an embodiment of the present invention inside the mined station;

[0018] Figure 2 is a partial cross-sectional view of the shield reaction device provided by an embodiment of the present invention arranged in the mined station;

[0019] Figure 3 is a front view of the shield reaction device provided by an embodiment of the present invention;

[0020] Figure 4It is a side view of the shield reaction device provided by an embodiment of the present invention;

[0021] Figure 5 is Figure 4 a partial enlarged schematic view at position A in

[0022] Figure 6 It is a plan schematic view of the launching bracket provided by an embodiment of the present invention;

[0023] Figure 7 It is a side view of the launching bracket provided by an embodiment of the present invention.

[0024] Explanation of reference numerals:

[0025] 1. Shield reaction device; 11. Support frame; 111. Column; 112. First cross beam; 113. Second cross beam; 114. First fastener; 115. Diagonal brace; 116. Reinforcing plate; 12. Steel ring; 121. Body; 1211. Splicing block; 122. Special-shaped plate; 1221. Splicing plate; 13. Reaction member; 14. Reference ring; 141. First surface; 142. Second surface; 143. First outer edge; 144. Second outer edge; 21. Cover and cut station; 22. Cover and cut tunnel section; 23. Surrounding rock; 24. Shield machine; 25. Negative segment; 26. Launching bracket; 261. Ballast sleeper; 262. Corbel; 263. I-beam; 27. Gravel layer; 28. Steel plate; 29. Jack. Detailed implementation manners

[0026] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] In the various specific technical features described in the specific embodiments, they can be combined in any suitable manner without conflict. For example, different embodiments and technical solutions can be formed by combining different specific technical features. To avoid unnecessary repetition, various possible combination methods of the various specific technical features in the present invention will not be described separately.

[0028] Such as Figure 1 and Figure 2As shown in the figure, a shield reaction device 1 provided by an embodiment of the present invention is arranged in the mined tunnel 22 within the mined station 21, and is used to provide a reaction force to the shield machine 24 that starts shield tunneling in the mined tunnel 22, so as to realize the shield propulsion during the starting process of the shield machine 24. The shield reaction device 1 includes a support frame 11, a steel ring 12, a reaction member 13, and a reference ring 14. The support frame 11 is preferably welded by "H"-shaped steel with a material of Q235B (indicating carbon structural steel with a quality grade of B and a yield strength value of 235 MPa) into a portal frame structure, which is roughly in the shape of a "quadrilateral" and has strong structural strength, and is used to provide installation support for the steel ring 12 and the reference ring 14. The steel ring 12 is fixedly installed on the support frame 11, and the reference ring 14 is coaxially arranged with the steel ring 12 and fixedly connected to the steel ring 12. After installation, the steel ring 12 is located between the support frame 11 and the reference ring 14, and the reference ring 14 is close to the shield machine 24. The reference ring 14 is used to transfer the reaction force to the shield machine 24 through the negative segment lining 25. Specifically, the shapes of both the steel ring 12 and the reference ring 14 are circular rings, and their shapes can generally match the shape of the shield machine 24, and the shape of the negative segment lining 25 can at least match the shape of the reference ring 14, so that after the reference ring 14 is in close contact with the negative segment lining 25, there is a good contact surface between the reference ring 14 and the negative segment lining 25 to transfer the reaction force. The reaction member 13 is used to provide a reaction force to the shield machine 24 that starts shield tunneling in the mined station 21. One end of the reaction member 13 is inserted into the surrounding rock 23 of the mined tunnel 22 in a manner inclined at an angle with respect to the center line of the mined tunnel 22, and the other end of the reaction member 13 is fixedly connected to the steel ring 12. And, along the tunneling direction of the mined tunnel 22, the position where the reaction member 13 is inserted into the surrounding rock 23 is in front of the steel ring 12. At the same time, in order to provide a reliable reaction force, a plurality of reaction members 13 are connected to the steel ring 12, and the reaction members 13 are evenly distributed along the circumferential direction of the steel ring 12. In this way, one end of each reaction member 13 inserted into the surrounding rock 23 is fixed in the surrounding rock 23, and the other end of each reaction member 13 is correspondingly fixedly connected to the steel ring 12. Thus, when a force opposite to the tunneling direction is generated on the steel ring 12, the position of the support frame 11 can be prevented from moving under the tensile force provided by each reaction member 13. In this way, in actual use, after the thrust generated by the shield machine 24 acts on the steel ring 12 through transmission, the thrust generated by the shield machine 24 can be converted into the driving force for the shield machine 24 to advance forward through the pulling of each reaction member 13. And the function of providing a reaction force to the shield machine 24 that starts shield tunneling in the mined tunnel 22 is achieved.Moreover, by inclining and fixedly connecting the reaction member 13 in the surrounding rock 23, not only can reliable tensile force be provided, but also the reaction member 13 will not damage the lining structure inside the mined - out station 21. Thus, the waterproof structure quality of the station can be kept reliable, realizing stable waterproofing and enhancing the safety of the structure of the mined - out station 21. At the same time, it will not interfere with the operation of the shield machine 24, with good design ingenuity, and well solve the problems existing in the shield starting in the deep - buried mined - out station 21.

[0029] Specifically, the reaction member 13 is usually preferably set as a cable anchor. After one end of the cable anchor is driven into the surrounding rock 23, it can be reliably connected in the surrounding rock 23 without falling off, and then stably provide the acting force for pulling the steel ring 12. Moreover, the cable anchor can also adjust its own length to always maintain a tensioned state during the working process. In actual setting, it is necessary to calculate and determine the inclination angle value and quantity of the reaction member 13, as well as the length of the anchorage section driven into the surrounding rock 23 according to specific working conditions requirements to ensure a firm connection. And the end of the reaction member 13 connected to the steel ring 12 is preferably connected through a fixture device to achieve a reliable connection.

[0030] As Figure 2 and Figure 3 shown, in a possible implementation scheme, the support frame 11 includes columns 111, a first cross - beam 112, and a second cross - beam 113. Specifically, there are two columns 111, and the two columns 111 are arranged relatively and vertically at intervals. The two ends of the first cross - beam 112 are respectively fixedly connected to the two columns 111 and are located at the upper ends of the two columns 111; while the two ends of the second cross - beam 113 are respectively fixedly connected to the two columns 111 and are located at the lower ends of the two columns 111. With such a setting, the formed support frame 11 is a frame structure similar to a quadrilateral. The steel ring 12 is fixedly connected to at least two columns 111 through the first fasteners, thereby realizing the fixed installation of the steel ring 12. Of course, it can be understood that since the steel ring 12 is circular, under the condition of meeting the connection requirements, the steel ring 12 can also be connected to the first cross - beam 112 and / or the second cross - beam 113 through the first fasteners 115 to further improve the connection stability between the steel ring 12 and the mounting frame. The first fasteners 115 are preferably high - strength bolts with good connection reliability.

[0031] In a possible implementation scheme, a plurality of connection holes for the first fasteners 115 to pass through are respectively arranged on the two columns 111, and the connection holes are spaced along the height direction of the columns 111. In this way, when fixedly connecting the steel ring 12 to the columns 111, the installation position of the steel ring 12 can be adjusted by installing the steel ring 12 in the connection holes at different heights as required.

[0032] As Figure 3 andFigure 4 As shown, in a possible implementation, the support frame 11 further includes a diagonal brace 115. The diagonal brace 115 is respectively connected to the two columns 111 and is located on the side opposite to the shield direction. That is, the diagonal braces 115 are respectively connected to the two columns 111 on the side opposite to the shield direction. The diagonal brace 115 is used to provide a backseat reaction force for the support frame 11, so that when the shield machine 24 pushes the support frame 11 backward, the diagonal brace 115 located at the rear can provide support to keep the support frame 11 stable. Specifically, one end of the diagonal brace 115 is fixedly connected to the column 111, and the connection method can be welding or bolt connection. The other end of the diagonal brace 115 extends downward obliquely and is flush with the bottom end of the column 111. The plane where the extended ends of the two diagonal braces 115 are located can be kept consistent with the plane where the bottom ends of the two columns 111 are located, so that the support frame 11 can be kept stable when placed. In actual setting, the angle between the diagonal brace 115 and the column 111 needs to be determined according to the design requirements. At the same time, a reinforcing plate 116 can be connected between the extended end of the diagonal brace 115 and the bottom end of the column 111 to increase the stability of the overall structure, and at the same time, it can also increase the contact area with the ground, with a large stress area, enhancing the stability of the setting.

[0033] As Figure 3 and Figure 4As shown, in a possible implementation, the steel ring 12 includes a body 121 and a special-shaped plate 122. The body 121 is in a circular ring shape and its size is basically matched with that of the reference ring 14. The special-shaped plates 122 are fixedly connected to two opposite surfaces of the body 121, that is, the special-shaped plates 122 are fixedly connected to the surface facing the support frame 11 and the surface facing the reference ring 14. These two special-shaped plates 122 are respectively used for fixedly connecting with the support frame 11 and the reference ring 14. Specifically, since the body 121 is in a circular ring shape and the support frame 11 is quadrilateral, in order to fixedly connect the body 121 to the support frame 11, the special-shaped plates 122 are provided. The special-shaped plates 122 are made of steel plate material. After the special-shaped plates 122 are fixedly connected to the body 121 by welding or bolt connection, they have extended parts, and at least the extended parts can increase the contact area with the column 111. In actual setting, it is preferably to set the shape formed by the extended parts on the special-shaped plates 122 to be roughly in an "octagon" shape, and the special-shaped plates 122 have through holes with an inner diameter not less than the inner diameter of the body 121. In this way, on the premise of ensuring that the shape of the body 121 is not damaged, the reliability of the installation of the body 121 is improved through the fixed connection of the special-shaped plates 122. Moreover, for the special-shaped plates 122 in this shape, the shapes of each surface are basically the same. During installation, the installation position can be flexibly adjusted, overcoming the defect that installation can only be carried out through specific positions, and the installation convenience is good. And due to the provision of the special-shaped plates 122, one end of the reaction member 13 is connected to any one of the two special-shaped plates 122. In the embodiment of the present invention, it is preferably to connect each reaction member 13 to the special-shaped plate 122 connected to the reference ring 14 and be respectively located at the corners of the special-shaped plate 122.

[0034] As Figure 3 and Figure 4 shown, in a possible implementation, the body 121 includes a plurality of splicing blocks 1211, and the splicing blocks 1211 are spliced with each other to form the body 121. That is, the body 121 is set to be formed by splicing a plurality of splicing blocks 1211 with each other. The splicing blocks 1211 are fixedly connected by second fasteners, and after the splicing blocks 1211 are spliced, they form a circular ring. With such a setting, the body 121 is set to be composed of a plurality of splicing blocks 1211, which is convenient for production and manufacturing, and also convenient for disassembly and transportation. The second fasteners for connecting the splicing blocks 1211 are preferably bolts. And when the body 121 is set in this way, the special-shaped plates 122 connected to two opposite surfaces of the body 121 can be fixedly connected after the splicing blocks 1211 are spliced, and at this time the special-shaped plates 122 are an integral plate-like structure.

[0035] As Figure 3 and Figure 4As shown, in a possible implementation, the special-shaped plate 122 can also be arranged in a dispersed splicing structure, that is, the special-shaped plate 122 is arranged to include a plurality of splicing plates 1221, and the splicing plates 1221 are spliced with each other to form a complete special-shaped plate 122. Specifically, each splicing plate 1221 is connected to the corresponding splicing block 1211. After the splicing blocks 1211 are spliced to form the main body 121, the splicing plates 1221 are also spliced accordingly to form the special-shaped plate 122. In this setting method, the splicing plates 1221 are fixedly connected to the opposite two surfaces of each splicing block 1211 respectively. Thus, the overall shape formed has good interchangeability, and it can be flexibly installed during installation without selecting specific parts of the components, making the installation convenient and flexible.

[0036] As Figure 4 and Figure 5 As shown, in a possible implementation, the reference ring 14 includes a first surface 141 and a second surface 142 arranged opposite to each other. A first outer edge 143 for connecting to the negative segment 25 is provided on the first surface 141, and a second outer edge 144 for connecting to the support frame 11 is provided on the second surface 142. And the outer diameter of the first outer edge 143 is smaller than the outer diameter of the second outer edge 144. Specifically, both the first outer edge 143 and the second outer edge 144 are circular rings. The first outer edge 143 faces the tail of the shield machine 24 and is used to connect to the first negative segment 25 during construction. The second outer edge 144 is used to be closely connected to the steel ring 12 so as to be fixedly connected to the steel ring 12 through bolts. The outer diameter of the second outer edge 144 is set to be larger than the outer diameter of the first outer edge 143, so that the second outer edge 144 has a larger contact area with the steel ring 12, improving the stability during force application.

[0037] During actual shield construction, the jacks at the tail of the shield machine 24 act on the negative segments 25, and the negative segments 25 transfer the force to enable the shield machine 24 to obtain the reaction force for forward tunneling. After the shield machine 24 tunnels forward a certain distance, negative segments 25 are added to enable the shield machine 24 to continuously obtain the reaction force until the smooth starting of the shield machine 24 is completed.

[0038] In an embodiment of the present invention, a shield reaction force device 1 is provided. One end of a reaction force member 13 is inserted obliquely into the surrounding rock 23 along the tunneling direction of the mined - out interval tunnel 22 and fixed, and the other end of the reaction force member 13 is fixedly connected to a special - shaped plate 122. In this way, by obliquely arranging and fixedly connecting the reaction force member 13 in the surrounding rock 23, not only can a reliable tensile force be provided to stabilize the position of the support frame 11, and then provide a stable reaction thrust for the tunneling machine, but also the obliquely arranged reaction force member 13 will not damage the lining structure in the mined - out station 21, so that the quality of the waterproof structure of the station can be kept reliable, realizing stable waterproofing and improving the safety of the structure of the mined - out station 21. It has a relatively promising application prospect in the construction of underground interval projects where the quality of the surrounding rock 23 is good and the thickness of the surrounding rock on the left and right lines meets certain requirements, with remarkable social and economic benefits.

[0039] An embodiment of the present invention also provides a shield starting operation method for operating the above - mentioned shield reaction force device 1 for shield starting. The shield starting operation method includes:

[0040] Inside the mined - out interval tunnel 22, one end of the reaction force member 13 is driven into the surrounding rock 23 of the mined - out interval tunnel 22, then fixed, and the firmness of the insertion into the surrounding rock 23 is ensured. The position of the reaction force member 13 arranged in the mined - out interval tunnel 22 is obtained by calculation according to various requirements in the early stage of construction and is allowed within a specified error range. After one end of the reaction force member 13 is fixed, the other end is temporarily suspended on the side wall of the mined - out interval tunnel 22 waiting to be connected to the steel ring 12. In this way, according to the construction requirements, a plurality of reaction force members 13 are arranged as needed in the mined - out interval tunnel 22.

[0041] After the installation of the reaction force member 13 is completed, the support frame 11 is arranged at the tail of the shield machine 24, and the steel ring 12 and the reference ring 14 are installed in sequence. That is, the steel ring 12 is first fixedly installed on the support frame 11, and then the reference ring 14 is fixedly installed on the steel ring 12. Then the other ends of the respective reaction force members 13 are connected to the steel ring 12 in sequence, and each reaction force member 13 is adjusted to a tensioned state so that each reaction force member 13 is in a stressed state.

[0042] After the installation of the shield reaction force device 1 is completed, a negative - ring segment 25 is arranged between the shield machine 24 and the reference ring 14, and both ends of the negative - ring segment 25 are kept in close contact with the reference ring 14 and the shield machine 24 respectively and are in a stressed state. At this time, the shield starting operation is completed.

[0043] In an embodiment of the present invention, when the shield starting operation is carried out inside the mined - out station 21, it is necessary to first excavate and construct the mined - out station 21 in the surrounding rock of the formation and form the mined - out interval tunnel 22 by means of the mining method. To ensure the safety of the mined - out station 21, the secondary lining pouring of the mined - out station 21 is completed before shield starting, and only the initial support is constructed after the excavation of the mined - out interval tunnel 22.

[0044] In the embodiment of the present invention, before the operation of setting the support frame 11 at the tail of the shield machine 24, a crushed stone layer 27 (refer to Figure 2 ) is filled to the elevation at the bottom of the mined tunnel 22, and then a steel plate 28 (refer to Figure 2 ) is laid on the crushed stone layer 27. Then, the shield machine 24 is transferred into the ground for assembly through the ventilation shaft of the station, and then is towed to the starting section position in the mined tunnel 22 through the starting bracket 26 (refer to Figure 2 ), and the attitude of the shield machine 24 is adjusted to the designed starting position. At the same time, other components of the shield reaction device 1 are transferred into the mined station 21 for assembly and use.

[0045] Specifically, as shown in Figure 6 and Figure 7 , in the embodiment of the present invention, the starting bracket 26 is preferably a steel roadbed structure. The roadbed sleeper 261 is made of H-shaped steel and is laid flat on the steel plate 28 at a certain interval (0.5 m to 1 m) along the direction of shield tunneling. Two bracket feet 262 are installed on each roadbed sleeper 261, and two I-shaped steel beams 263 are erected along the tunneling direction on the bracket feet 262 and are buckled into a whole by fasteners for supporting and limiting the shield machine 24. There are two sets of supporting jacks on the starting bracket 26, which can provide operations related to the vertical jacking of the shield machine 24 and the forward and backward translation of the starting bracket 26.

[0046] In a possible implementation scheme, the shield starting operation method further includes: after setting the support frame 11 at the tail of the shield machine 24, jacks 29 (refer to Figure 2 ) are arranged between the support frame 11 and the surrounding rock 23, and the position of the support frame 11 is stabilized by controlling the jacks 29. Specifically, preferably, jacks 29 are respectively arranged on the two opposite sides of the support frame 11 and the surrounding rock 23, and then the position of the support frame 11 is stabilized by controlling the jacks 29 on both sides to prevent the position from changing before shield starting.

[0047] Through the shield starting operation provided by the embodiment of the present invention, the reliable starting of the shield machine 24 in the mined station 21 is realized, which provides a solution idea and method for setting the support reaction device for shield starting in the mined station 21, and has a relatively promising application prospect.

[0048] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A shield reaction force device is arranged in a mined tunnel section within a mined station, and is characterized in that, Comprising: Support frame; Steel ring, fixedly installed on the support frame; Reaction member, one end of the reaction member is obliquely inserted into the surrounding rock of the mined - out section tunnel, the other end of the reaction member is fixedly connected to the steel ring, the reaction member forms an angle with the center line of the mined - out section tunnel, and the reaction member is kept in a tensioned state to provide a reaction thrust to the shield machine starting in the mined - out station; Reference ring, coaxially arranged with the steel ring and fixedly connected to the steel ring, the reference ring is used to transfer the reaction thrust to the shield machine through the negative segment; Wherein, along the tunneling direction of the mined - out section tunnel, the position where the reaction member is inserted into the surrounding rock is in front of the steel ring and on the side wall of the mined - out section tunnel; a plurality of the reaction members are connected to the steel ring, and each of the reaction members is evenly distributed along the circumferential direction of the steel ring; The steel ring includes: Body; Special - shaped plates, fixedly connected to two opposite surfaces of the body, and the two special - shaped plates are respectively used for fixedly connecting with the support frame and the reference ring; Wherein, the reaction member is connected to the special - shaped plate connected to the reference ring, is respectively located at the corners of the special - shaped plate, and is inclined away from the center line of the body starting from the special - shaped plate.

2. The shield reaction force device according to claim 1, characterized in that, The support frame includes: Two columns, the two columns are opposite and vertically spaced; First cross - beam, with both ends respectively fixedly connected to the two columns and located at the upper ends of the two columns; Second cross - beam, with both ends respectively fixedly connected to the two columns and located at the lower ends of the two columns; Wherein, the steel ring is fixedly connected to at least two of the columns through the first fasteners.

3. The shield reaction force device according to claim 2, characterized in that, A plurality of connection holes for the first fasteners to pass through are respectively arranged on the two columns, and each of the connection holes is spaced along the height direction of the column.

4. The shield reaction force device according to claim 2, characterized in that, The support frame further includes: Diagonal bracing, respectively connected to the two columns and located on the side opposite to the shield direction; Wherein, one end of the diagonal bracing is fixedly connected to the column, the other end of the diagonal bracing extends obliquely downward and is flush with the bottom end of the column.

5. The shield reaction force device according to claim 1, wherein, The body includes a plurality of splicing blocks, and the splicing blocks are spliced with each other to form the body, and the splicing blocks are fixedly connected to each other through the second fasteners.

6. The shield reaction force device according to claim 5, wherein, The special - shaped plate includes a plurality of splicing plates, and the splicing plates are spliced with each other to form the special - shaped plate, and each of the splicing plates is connected to the corresponding splicing block.

7. The shield reaction force device according to any one of claims 1 to 6, characterized in that The reference ring includes a first surface and a second surface arranged oppositely, a first outer edge for connecting with the negative segment is arranged on the first surface, a second outer edge for connecting with the support frame is arranged on the second surface, and the outer diameter of the first outer edge is smaller than the outer diameter of the second outer edge.

8. A shield starting operation method for operating the shield reaction force device as described in any one of claims 1 to 7 to start the shield, characterized in that, The shield starting operation method includes: Inside the mined - out section tunnel, driving one end of the reaction member into the surrounding rock of the mined - out section tunnel, and hanging the other end of the installed reaction member on the side wall of the mined - out section tunnel; Set the support frame at the tail of the shield machine, and sequentially install the steel ring and the reference ring. Then connect the other end of the reaction member to the steel ring and adjust the reaction member to a tensioned state; Set the negative segment between the shield machine and the reference ring, and keep both ends of the negative segment in close contact with the reference ring and the shield machine respectively, and the shield starting operation is completed.

9. The shield starting operation method according to claim 8, characterized in that The shield starting operation method further includes: After setting the support frame at the tail of the shield machine, jacks are arranged between the support frame and the surrounding rock, and the jacks are controlled to stabilize the position of the support frame.

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