Prefabricable reaction frame system for secondary tunnel boring machine launch

Abstract

This utility model provides an assemblable reaction frame system for secondary launch of a tunnel boring machine (TBM), belonging to the technical field of tunnel excavation equipment. The lower crossbeam of the main reaction frame is divided into a lower left crossbeam and a lower right crossbeam; the left column is divided into an upper left column and a lower left column; the right column is divided into an upper right column and a lower right column; the left and right ends of the upper crossbeam are connected to the upper left column and the upper right column, respectively; the left end of the lower left crossbeam is connected to the lower left column, and the right end of the lower right crossbeam is connected to the lower right column; the lower left and lower right crossbeams are fixedly connected to form the lower crossbeam; the upper left column and the lower left column are fixedly connected to form the left column; the upper right column and the lower right column are fixedly connected to form the right column; the left and right integrated diagonal braces are fixed to the rear sides of the left and right columns, respectively, and are fixedly connected to pre-embedded anchors. This utility model, through the design of "pre-embedded anchors + assembly structure + hydraulic jacking," enables the TBM to successfully restart even when there is no traditional reaction force support midway through the tunnel.

Description

Technical Field

[0001] This utility model provides an assemblable reaction frame system for secondary launching of shield tunnels, belonging to the technical field of tunnel excavation construction equipment. Background Technology

[0002] In tunnel boring machine (TBM) excavation, the TBM typically relies on the pre-installed segment rings behind it for jacking reaction support. When the TBM needs to restart midway through a section (e.g., in a station or in a cut-and-cover tunnel), it often faces the problem of having no pre-assembled segments to push forward. In this case, a temporary reaction frame must be erected to provide the reaction force required for the TBM to advance.

[0003] Traditional methods for constructing secondary launch reaction frames are typically time-consuming and complex. They require drilling holes in the existing structure to install anchor bolts or installing large steel supports to fix the reaction frame to the tunnel portal, floor, or other structures. This not only increases the number of construction steps but also risks disturbing the existing structure, and positioning accuracy is difficult to guarantee. Furthermore, operating large equipment in the confined space of tunnels or stations is challenging, increasing construction risks. How to quickly and reliably construct reaction supports while ensuring safety has always been a key technical challenge in secondary launch tunnel boring machine (TBM) construction.

[0004] In recent years, scholars and engineering practitioners have proposed accelerating the construction of reaction frames by pre-embedding load-bearing components. For example, a patented technology for secondary launch of mined tunnels involves pre-embedding steel plates in the secondary lining concrete and welding steel supports and steel ring reaction frames to these pre-embedded steel plates, forming a shield launch reaction support system. This allows for a smooth secondary launch of the tunnel boring machine (TBM) within confined spaces. This method utilizes conventional materials and improves construction efficiency by cleverly designing the positions of pre-embedded components and reserved holes, avoiding high-risk operations such as the removal of existing tunnel lining segments. However, publicly available information on solutions using pre-embedded reaction frames for secondary launch of TBMs mid-station is still rare, and most existing technologies do not fully integrate pre-embedded components with prefabricated components to achieve this goal. Therefore, it is necessary to develop an innovative reaction frame system that pre-embeds support components during the main structure construction phase and rapidly assembles them during the secondary launch of the TBM to provide sufficient reaction force while ensuring safe and efficient construction. Utility Model Content

[0005] The purpose of this invention is to provide an assemblable reaction frame system for secondary tunnel boring machine (TBM) launching, solving the problems of time-consuming, difficult-to-position, and high-risk secondary launching reaction support construction in existing technologies. By combining pre-embedded anchors with a modular assemblable reaction frame, the TBM can quickly obtain the required jacking reaction support when launching midway through the tunnel (such as inside a station), ensuring construction safety and efficiency.

[0006] The specific technical solution is as follows:

[0007] The prefabricable reaction frame system for secondary tunnel boring machine launch includes pre-embedded anchors, main reaction frame frame, left integrated diagonal brace and right integrated diagonal brace;

[0008] The load-bearing components pre-embedded in the main structure at the secondary starting position of the shield tunnel serve as pre-embedded anchors.

[0009] The main reaction frame includes an upper crossbeam, a lower crossbeam, a left column, and a right column;

[0010] The lower crossbeam is divided into a lower left crossbeam and a lower right crossbeam; the left column is divided into an upper left column and a lower left column; the right column is divided into an upper right column and a lower right column.

[0011] The upper crossbeam is connected to the upper left column and the upper right column at its left and right ends, respectively.

[0012] The left end of the lower left crossbeam is connected to the lower left column, and the right end of the lower right crossbeam is connected to the lower right column.

[0013] The lower left crossbeam has a left connecting plate at the right end and a right connecting plate at the left end. The left connecting plate and the right connecting plate are connected to fix the lower left crossbeam and the lower right crossbeam to form a lower crossbeam.

[0014] The upper left column is provided with a connecting plate at the lower end, and the lower left column is provided with a connecting plate at the upper end. The connecting plate of the upper left column and the connecting plate of the lower left column are connected together to fix the upper left column and the lower left column to form a left column.

[0015] The upper right column is provided with a connecting plate at the lower end, and the lower right column is provided with a connecting plate at the upper end. The connecting plate of the upper right column and the connecting plate of the lower right column are connected together to fix the upper right column and the lower right column to form a right column.

[0016] The left and right integrated diagonal braces are fixed to the rear sides of the left and right columns, respectively;

[0017] The front end of the left integrated diagonal brace is provided with a vertical left connecting plate for fixed connection with the left column; the bottom end is provided with a left bottom connecting plate for fixed connection with the pre-embedded anchor.

[0018] The front end of the right integrated diagonal brace is provided with a vertical right connecting plate for fixed connection with the right column; the bottom end is provided with a right bottom connecting plate for fixed connection with the pre-embedded anchor.

[0019] Small diagonal braces are provided on the inner side of the corners where the upper crossbeam, lower crossbeam, left column, and right column of the main reaction frame are connected in sequence.

[0020] This utility model organically combines embedded component technology with prefabricated structure design, and its innovation is mainly reflected in the following aspects:

[0021] (1) Pre-embedded reaction support foundation: Bearing steel plates and anchor bars are pre-embedded during the main structure construction stage, and used directly as reaction frame support points during the second launch of the shield. This pre-embedded + on-site method eliminates the cumbersome steps of drilling and anchoring on site, and has precise positioning and high anchoring strength. The position and specifications of the pre-embedded anchors are carefully designed and laid out to fully withstand the huge reaction force required for shield jacking, and to ensure minimal disturbance to the existing structure during construction.

[0022] (2) Modular Assembleable Reaction Frame: The reaction frame adopts a modular design, with each component prefabricated in the factory and strength-checked. It is then quickly assembled on-site using bolts and minimal welding. Compared to traditional integral welded frames, the modular components are of moderate weight, easy to transport and install, and particularly suitable for manual or small-scale hoisting assembly in the confined spaces of stations. Its octagonal / ring-shaped frame structure is arranged close to the tunnel cross-section, distributing the thrust evenly, and its highly integrated design facilitates disassembly and reuse.

[0023] (3) Diagonal Bracing Combination Structure: To address the issue of instability of the reaction frame under stress, this invention incorporates multiple diagonal bracings. These bracings and L-shaped fixed steel plates form a stable spatial force-bearing system. The lower ends of the diagonal bracings are directly welded to or connected to pre-embedded steel plates (embedded in the base plate or side wall), eliminating the need for temporary supports and thus efficiently transferring the tunnel boring machine's thrust to the main structure. This diagonal bracing combination design is simple to install, and its structure reliably resists slippage or overturning of the reaction frame under stress, achieving highly stable reaction support.

[0024] (4) Faster and more efficient construction, improved safety: Due to the pre-installed and precisely positioned pre-embedded anchors, the workload and time required for on-site assembly of the reaction frame are significantly reduced. For example, in actual projects, the reaction frame components can be installed and positioned within hours based on the pre-reserved locations of the steel plates, saving a significant amount of time compared to traditional methods. Pre-embedded supports avoid drilling and anchoring in existing structures, reducing the risk of damage to existing structures and waterproofing risks. Furthermore, all materials and equipment used are conventional profiles (such as Q235 steel plates, etc.). The method utilizes various materials (such as reinforcing bars and conventional hydraulic jacks), offering good versatility and high economic efficiency. Analysis shows that this invention can significantly improve construction efficiency while ensuring the safety of tunnel boring machine (TBM) launch, resulting in substantial economic and social benefits.

[0025] In summary, the assemblable reaction frame system provided by this utility model, through its comprehensive and innovative design of "pre-embedded anchors + assembly structure + hydraulic jacking," enables the tunnel boring machine to successfully restart even when there is no traditional reaction force support midway (such as at a station). This solution balances structural reliability and construction convenience, possessing unique innovativeness and practical value in the field of shield tunneling. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the main reaction frame structure of this utility model;

[0027] Figure 2 This is a schematic diagram of the upper crossbeam structure of this utility model;

[0028] Figure 3 This is a schematic diagram of the lower crossbeam structure of this utility model;

[0029] Figure 4 This is a schematic diagram of the diagonal bracing structure of this utility model. Detailed Implementation

[0030] A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings. It should be understood that this embodiment is only used to explain the present invention and is not intended to limit the scope of protection of the present invention.

[0031] The modular reaction frame system for secondary launch of a tunnel boring machine (TBM) of this invention mainly includes the following components: pre-embedded anchors, main reaction frame frame, diagonal bracing and cross bracing components, and a jacking device that abuts against the TBM.

[0032] Pre-embedded anchors: These are load-bearing components pre-embedded in the main structure at the secondary launch position of the tunnel boring machine (TBM), preferably thick steel plates with additional anchor bars. Several pre-embedded steel plates are pre-positioned in locations such as the station end wall, bottom slab, or walkway, and firmly connected to the structural concrete by reinforcing bars. The specifications and arrangement of the pre-embedded steel plates are determined according to the design reaction force requirements, for example, steel plates with dimensions of 600×600×20mm or 800×600×20mm, with several anchor bars of 25mm diameter and 3m length welded to the bottom. The location and quantity of the pre-embedded anchors are precisely measured and laid out to match the installation requirements of each component of the reaction frame, ensuring that the TBM's jacking thrust is reliably transferred to the surrounding structure.

[0033] like Figures 1 to 3 As shown, the main reaction frame is a support frame assembled from high-strength steel components. It is the main structure that bears the reaction force of the shield tunneling. It is preferably a segmented, assembleable ring or portal frame.

[0034] The main reaction frame includes an upper crossbeam 1, a lower crossbeam, a left column, and a right column;

[0035] The lower crossbeam is divided into a lower left crossbeam 2 and a lower right crossbeam 3; the left column is divided into an upper left column 6 and a lower left column 8; the right column is divided into an upper right column 7 and a lower right column 9.

[0036] The upper horizontal beam 1 is connected to the upper left column 6 and the upper right column 7 at its left and right ends, respectively.

[0037] The left end of the lower left crossbeam 2 is connected to the lower left column 8, and the right end of the lower right crossbeam 3 is connected to the lower right column 9.

[0038] The lower left crossbeam 2 is provided with a lower crossbeam left connecting plate 12 at its right end, and the lower right crossbeam 3 is provided with a lower crossbeam right connecting plate 13 at its left end. The lower crossbeam left connecting plate 12 and the lower crossbeam right connecting plate 13 are connected to fix the lower left crossbeam 2 and the lower right crossbeam 3 into a lower crossbeam.

[0039] The upper left column 6 is provided with an upper left column connecting plate 10 at its lower end, and the lower left column 8 is provided with a lower left column connecting plate 11 at its upper end. The upper left column connecting plate 10 and the lower left column connecting plate 11 are connected to fix the upper left column 6 and the lower left column 8 to form a left column.

[0040] The upper right column 7 is provided with an upper right column connecting plate 19 at its lower end, and the lower right column 9 is provided with a lower right column connecting plate 20 at its upper end. The upper right column connecting plate 19 and the lower right column connecting plate 20 are connected to fix the upper right column 7 and the lower right column 9 to form a right column.

[0041] The cross-sectional dimensions and material specifications of each major component have undergone specialized design calculations. For example, the horizontal and vertical beams are box-shaped beams welded from Q235 steel plates, with a steel plate thickness of 30mm in the main load-bearing parts and a cross-sectional shape of approximately 900mm × 600mm. This cross-sectional design ensures that the reaction frame has sufficient strength and rigidity to withstand thrusts of thousands of tons (up to approximately 12,000kN). The inner shape of the main frame can be customized according to the shape of the tunnel boring machine, such as an equilateral polygon or a ring, to closely fit the tunnel cross-section and evenly distribute the thrust.

[0042] diagonal bracing components: such as Figure 1 and Figure 4 As shown, the left integrated diagonal brace 4 and the right integrated diagonal brace 5 are fixed to the rear side of the left column and the right column, respectively;

[0043] The front end of the left integrated diagonal brace 4 is provided with a vertical left connecting plate 15 for fixed connection with the left column; the bottom end is provided with a left bottom connecting plate 16 for fixed connection with the pre-embedded anchor.

[0044] The front end of the right integrated diagonal brace 5 is provided with a vertical right connecting plate 17 for fixed connection with the right column; the bottom end is provided with a right bottom connecting plate 18 for fixed connection with the pre-embedded anchor.

[0045] The left integrated diagonal brace 4 and the right integrated diagonal brace 5 are auxiliary support members connecting the main reaction frame and the pre-embedded anchors, used to enhance the overall stability of the reaction frame. It is preferable to install multiple sets of diagonal braces (inclined supports) and necessary transverse struts to fix the main reaction frame to the pre-embedded steel plate above or to the side of the pre-embedded anchors. The diagonal braces can be made of I-beam or box-section steel components, such as a variable cross-section I-beam welded from 30mm thick steel plates with a height of approximately 600mm, with a minimum cross-sectional size of approximately 600mm × 380mm. One end of the diagonal brace is connected to the main frame via a connecting plate or flange, and the other end is fixed to the pre-embedded steel plate by welding or bolting.

[0046] If necessary, lateral support rods can be added to the top, bottom, or sides of the frame to form a spatially stable support system. Through the combination of diagonal and lateral bracing, the reaction frame can distribute the tunnel boring machine's thrust to multiple pre-embedded points in the surrounding rock or structural lining, improving support stability and preventing frame displacement.

[0047] During construction, this utility model also requires a jacking device: a jacking mechanism installed between the main reaction frame and the tunnel boring machine (TBM), used to push the TBM away from the support base and provide initial tunneling power at the start. The jacking device typically consists of several large-tonnage hydraulic jacks, one end of which rests against the main reaction frame (such as the main frame beam or steel ring), and the other end abuts against the corresponding force-bearing part of the TBM (such as the tail thrust bearing or the thrust transmission ring at the front of the cutterhead). By synchronously controlling the extension of multiple jacks, the TBM can be steadily jacked forward until its cutterhead cuts into the soil ahead and establishes normal tunneling reaction force. Once the TBM autonomously tunnels to form the first ring of segments and establishes its own reaction force, the jacking device can be retrieved. The specifications of the jacking device should be selected according to the tonnage and thrust requirements of the TBM to ensure sufficient stroke and jacking force. For example, multiple double-acting hydraulic jacks with a rated jacking force of 300 tons and a stroke of more than 1 meter can be used, distributed evenly around the circumference of the TBM to apply force.

[0048] The specific construction process is as follows:

[0049] (1) Installation of Embedded Anchors: During the construction of the civil structure at the secondary launch position of the tunnel boring machine, reaction frame anchor steel plates are pre-embedded according to the design drawings. Specific steps include: embedding several thick steel plates as reaction frame support points during the concrete pouring of the station end wall; and simultaneously embedding the bottom plate pre-embedded steel plates in the backfill concrete of the walkway bottom slab. All pre-embedded steel plates must be accurately positioned, have an elevation that conforms to the design, and be reliably connected or anchored to the surrounding steel reinforcement cage to ensure the load-bearing capacity in the later stage. After the pre-embedded anchors are installed, their outer surface should be basically flush with the surrounding structural surface, and measures should be taken to avoid damage or displacement of the pre-embedded anchors during subsequent construction (e.g., adding a cover plate for protection or making markings).

[0050] (2) Tunnel Boring Machine (TBM) Positioning and Launch Preparation: After the TBM completes the excavation of the previous section and arrives at the secondary launch site (such as a station), first place the TBM on the launch base or guide platform, and center and level it so that its axis coincides with the tunnel centerline. Clean the tail of the TBM and the surrounding construction site to ensure that the pre-embedded reaction steel plates are exposed and the surface is clean and free of debris. Check the position and condition of each pre-embedded anchor to confirm that the anchors are firm and not loose. Then, according to the launch direction of the TBM, place the jacking jack foundation pads (if necessary) at the tail of the TBM or in front of the cutterhead. Normally, the TBM's own main jacking cylinder can apply force through the reaction frame without the need for additional pads; however, if the design uses independent jacks for jacking, jack seats or pads need to be set at the tail of the TBM for force transmission.

[0051] (3) Reaction frame assembly installation: Quickly erect the reaction frame device at the tunnel boring machine's launch section according to the predetermined plan. The installation sequence is as follows:

[0052] Main Frame Placement: The prefabricated main reaction frame is transported to the site in sections. The upper crossbeam 1, upper left column 6, and upper right column 7 are pre-fixed to form the upper crossbeam component. The lower left crossbeam 2, lower left column 8, lower right crossbeam 3, and lower right column 9 are pre-fixed to form the lower left and lower right crossbeam components. Using a crane or chain hoist, the lower left and lower right crossbeam components are placed near the corresponding pre-embedded steel plates on the station floor slab, aligning their bottom connecting plates with the pre-embedded anchor plates and securing them with bolts. The lower left and lower right crossbeam components are then bolted together. The upper crossbeam component is then hoisted to the top of the lower left and lower right crossbeam components, and the hole positions are corrected. High-strength bolts are then used to connect and lock the upper crossbeam component to the lower left and lower right crossbeam components. At this point, the upper and lower crossbeams form a portal / ring-shaped main frame skeleton.

[0053] Diagonal bracing installation: According to the design layout, diagonal braces are installed on both sides of the main frame. The left integrated diagonal brace 4 and the right integrated diagonal brace 5 have pre-processed connecting steel plates on their sides, which are fixed to the corresponding nodes of the main frame by bolts or welding. The lower end of the diagonal brace is aligned with the pre-embedded steel plate at its location and fixed by full welding. Installation must be symmetrical on both sides and proceed from top to bottom to ensure the frame is not subjected to eccentric loading. After completing the above steps, a complete reaction frame system is assembled.

[0054] Position Verification and Reinforcement: Using a total station and other surveying equipment, the assembled reaction frame is positioned and verified to ensure its end face is orthogonal to the tunnel boring machine's (TBM) launch direction, its center coincides with the TBM's axis, and its elevation meets design requirements. If necessary, the uniformity of stress on each support member is fine-tuned using shims. After confirming correct positioning, all connections are reinforced a second time: all bolts are tightened to the specified torque; the quality of critical welds is checked, and any deficiencies are promptly repaired. In particular, it is crucial to ensure all reaction support components are located within the same vertical section to prevent eccentric loads on the reaction frame. Finally, the connection between the embedded anchors and the reaction frame is checked again to ensure there are no looseness or cracks.

[0055] (4) Arrangement of the jacking system: The hydraulic jacking jacks are grouped and placed at the designed positions between the tunnel boring machine (TBM) and the reaction frame. A symmetrical arrangement is generally used, such as 4 or 6 jacks evenly distributed around the circumference of the TBM's tail. Each jack is supported by a steel plate or pad, tightly against the load-bearing surface of the reaction frame's main beam; the piston end of the jack presses against the thrust bearing plate (or a custom-made load-bearing block) at the tail of the TBM. Connect the high-pressure oil pipes of the jacks to the synchronous jacking system, and install pressure gauges and distribution valves to ensure that the operator can simultaneously control the advancement of all jacks. Conduct a no-load pressure test to check whether the force on the reaction frame support surface and the contact surface of the TBM is uniform; if uneven, adjust the pad thickness or the jack position until the force at each jacking point is balanced.

[0056] (5) Secondary jacking of the tunnel boring machine (TBM): After all preparations are complete, the secondary jacking of the TBM begins. First, the synchronous jacking jack system is activated, slowly and evenly applying thrust to the TBM. The jacking force is transmitted to the pre-embedded anchors through the reaction frame, and then from the anchors to the surrounding structure, forming reliable reaction force support, enabling the TBM cutterhead to cut steadily into the soil. During the jacking process, the TBM's attitude and the deformation of the reaction frame are monitored in real time: ensuring the TBM's advancing posture is controlled. If abnormal deformation or displacement of the reaction frame is detected, jacking should be immediately stopped and the pressure released. Jacking should only continue after inspection and reinforcement. Typically, after the jacks have advanced several tens of centimeters to one meter, the TBM cut enters a stable state, and earth pressure can be gradually established or excavation can continue until the first ring of tunnel segments can be installed. Subsequently, the external jacking is stopped, and the TBM's own main propulsion cylinder pushes against the installed tunnel segment ring to continue excavation. At this point, the TBM has successfully completed its secondary jacking and enters normal excavation mode.

[0057] (6) Reaction Frame Removal: After the tunnel boring machine has advanced several rings and its propulsion system is confirmed to be working normally and no longer required, the reaction frame can be removed. The removal sequence is the reverse of the installation sequence: First, remove the jacks and pads, and move the jacks off the trolley; then cut and remove the transverse steel pipe supports, and sequentially remove the bolts connecting the diagonal supports and the embedded steel plates, carefully lifting out the diagonal support assembly; next, disassemble the main frame, loosen the bolts between the upper and lower crossbeam components, remove the upper crossbeam component, lift the upper crossbeam component, and finally remove the lower left and lower right crossbeam components. During the disassembly process, take care to protect the surface of the embedded steel plates from excessive damage so that they can be reused or the structure restored later. All bolts, pads, jacks, etc. removed from the structure should be collected and recycled in a timely manner.

[0058] (7) Finishing and Structural Restoration: After the reaction frame is removed, if the embedded steel plates remain on the structural surface and do not affect subsequent use, they can be retained. If it is necessary to restore the structural flatness, the exposed embedded anchors can be treated with anti-corrosion measures and then sealed with mortar. The concrete surface excavated during construction should be repaired and leveled, and waterproofing should be done to ensure that no leakage risks remain. Finally, the surrounding structure and ground surface should be monitored and retested to confirm that the removal of the reaction frame has not had an adverse impact on the stability of the station structure. The entire construction of the secondary starting temporary reaction support is then completed.

[0059] Through the above implementation steps, the pre-embedded, assemblable reaction frame system of this utility model has been successfully applied in actual engineering projects. Specific engineering cases show that the multiple sets of steel plate embeddings pre-embedded in the bottom slab and side walls of the station's walkway greatly accelerated the erection and dismantling of the secondary launch reaction frame for the tunnel boring machine (TBM), significantly shortening the overall time compared to traditional methods. In a section of the Chongqing Rail Transit project, this utility model was used for the secondary launch preparation of the TBM. Nineteen pre-embedded steel plates of three specifications (600×600×20mm and 800×600×20mm, etc.) were fixed to the structure using anchor bars or anchor rods. The on-site erection of the octagonal frame reaction frame took less than one day, achieving ready-to-work reaction support for the TBM jacking, saving approximately 3-5 days compared to the traditional drilling and anchoring method. Simultaneously, the reaction frame exhibited good stability during the jacking process, without significant deformation or slippage, proving that the design calculations and structural measures are safe and reliable. After construction is completed, only a few welds need to be cut off, and the entire reaction frame system can be quickly dismantled to restore the station structure, with virtually no damage to the main structure during the process.

[0060] In summary, the "Assembleable Reaction Frame System for Secondary Tunnel Boring Machine Launching" provided by this utility model lays the support foundation through pre-embedding, achieves rapid construction through assembly technology, and ensures smooth tunnel boring machine launching by combining hydraulic jacking equipment. It possesses significant innovation and practical value. In the fields of urban rail transit, railway tunnels, and other engineering, this technology can provide new ideas for secondary tunnel boring machine launching under similar conditions, and has broad prospects for promotion and application.

Claims

1. A prefabricable reaction frame system for secondary launching of a tunnel boring machine, characterized in that, Includes pre-embedded anchors, main reaction frame, left integrated diagonal brace (4) and right integrated diagonal brace (5); The load-bearing components pre-embedded in the main structure at the secondary starting position of the shield tunnel serve as pre-embedded anchors. The main reaction frame includes an upper crossbeam (1), a lower crossbeam, a left column, and a right column; The lower crossbeam is divided into a lower left crossbeam (2) and a lower right crossbeam (3); the left column is divided into an upper left column (6) and a lower left column (8); the right column is divided into an upper right column (7) and a lower right column (9); The upper crossbeam (1) is connected to the upper left column (6) and the upper right column (7) at its left and right ends respectively; The left end of the lower left crossbeam (2) is connected to the lower left column (8), and the right end of the lower right crossbeam (3) is connected to the lower right column (9). The lower left crossbeam (2) is provided with a lower crossbeam left connecting plate (12) at the right end, and the lower right crossbeam (3) is provided with a lower crossbeam right connecting plate (13) at the left end. The lower crossbeam left connecting plate (12) and the lower crossbeam right connecting plate (13) are connected to fix the lower left crossbeam (2) and the lower right crossbeam (3) into a lower crossbeam. The lower end of the upper left column (6) is provided with an upper left column connecting plate (10), and the upper end of the lower left column (8) is provided with a lower left column connecting plate (11). The upper left column connecting plate (10) and the lower left column connecting plate (11) are connected to fix the upper left column (6) and the lower left column (8) to form a left column. The upper right column (7) is provided with an upper right column connecting plate (19) at its lower end, and the lower right column (9) is provided with a lower right column connecting plate (20) at its upper end. The upper right column connecting plate (19) and the lower right column connecting plate (20) are connected to fix the upper right column (7) and the lower right column (9) to form a right column. The left integrated diagonal brace (4) and the right integrated diagonal brace (5) are fixed to the rear side of the left column and the right column, respectively; and are fixedly connected with the pre-embedded anchors.

2. The prefabricable reaction frame system for secondary shield launching according to claim 1, characterized in that, The front end of the left integrated diagonal brace (4) is provided with a vertical left connecting plate (15) for fixed connection with the left column; the bottom end is provided with a left bottom connecting plate (16) for fixed connection with the pre-embedded anchor. The front end of the right integrated diagonal brace (5) is provided with a vertical right connecting plate (17) for fixed connection with the right column; the bottom end is provided with a right bottom connecting plate (18) for fixed connection with the pre-embedded anchor.

3. The prefabricable reaction frame system for secondary shield launching according to claim 1, characterized in that, The inner side of the corner where the upper crossbeam (1), lower crossbeam, left column and right column of the main reaction frame are connected in sequence is provided with small diagonal bracing (14).

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