Underground continuous wall underground excavation clearance scaffold for abutting existing station and construction method

Abstract

The present application relates to underground excavation construction technical field, specifically for the underground continuous wall excavation of existing station close to the barrier scaffold and construction method, including frame, the upper part of frame is equipped with two walkway board, the front side of frame is provided with dense mesh, the left and right sides of walkway board are both provided with two installation slot, the inner wall of installation slot is inserted with installation block, the front and back sides of installation block are both installed with sliding block, the beneficial effect is: through adopting MJS horizontal reinforcement technology, and five steps three steps method is carried out to break the hole door, realizes the quick, safe, low cost hole door breaking work, not only speeds up the construction progress, but also reduces the construction risk, simultaneously in the process of erecting scaffold, through the synergistic cooperation between hook, lower hook piece and rubber pad, thereby effectively reduces the possibility of walkway board sliding on frame, further enhances the stability of walkway board installation, and can also improve the use effect of scaffold.

Description

Technical Field

[0001] The present invention relates to the technical field of underground excavation construction, in particular to a scaffold for clearing obstacles by excavation close to an underground continuous wall of an existing station and a construction method thereof. Background Art

[0002] As a key livelihood project, urban rail transit construction plays an extremely important role in promoting high-quality development in many aspects of urban operation, management and services. In order to build a developed regional rail transit network, it is urgent to carry out rail transit expansion projects under the complex and restricted conditions of the urban core area. Under such conditions, the newly built tunnel section will inevitably pass through the existing line structure closely. Usually, existing stations will reserve through-passages for future lines, but in actual projects, due to insufficient planning, some reserved passages cannot be used. This leads to obstacles such as retaining piles, pull-out piles and lattice columns in the foundation of existing stations hindering the normal advancement of the shield machine. In order to ensure that the shield section can safely pass under the operating subway station, it is necessary to conduct research and analysis on the removal of obstacles around the foundation of the existing station.

[0003] In view of the high risks and complexity of construction technology brought about by dismantling underground continuous walls and excavating sandwich soil close to operating stations, and taking into account the problem of walkway plates sliding when temporarily setting up scaffolding, the present invention conducts in-depth research on the dark excavation and obstacle clearance technology close to the underground continuous walls of existing stations, and proposes a dark excavation and obstacle clearance scaffolding and construction method close to the underground continuous walls of existing stations to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a scaffolding and a construction method for dark excavation and obstacle removal close to the underground continuous wall of an existing station, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a scaffold for dark excavation and obstacle removal close to the underground continuous wall of an existing station, comprising a frame, two walkway plates installed on the upper part of the frame, a dense mesh provided on the front side of the frame, two mounting grooves provided on the left and right sides of the walkway plates, mounting blocks inserted into the inner walls of the mounting grooves, sliders installed on the front and rear sides of the mounting blocks, hooks installed on the separated sides of the mounting blocks on the left and right sides, a movable groove provided inside the hook, a pushing block inserted into the inner wall of the movable groove, and the pushing block A fixing plate is installed on the outside of the block, and an insert block is provided on the top of the pushing block. A slide groove is provided on the upper inner side of the mounting block, and a limit block is installed on the inner wall of the slide groove. A spring is installed on the adjacent side of the limit blocks on the left and right sides. A gear is rotatably connected to the inner wall of the mounting block, and a slide groove is provided on the bottom of the mounting block. A lower hook is inserted into the inner wall of the slide groove. Rubber pads are installed on the separated sides of the lower hooks on the left and right sides. A limit groove is provided on the adjacent side of the slide grooves on the left and right sides, and a connecting plate is installed on the inner wall of the limit groove.

[0006] The adjacent sides of the left and right plug blocks pass through the hooks and are inserted into the inner wall of the mounting block. The bottom of the plug block is engaged with the gear. The separated sides of the left and right lower hooks are engaged with the gears, and the adjacent sides are installed between the connecting plates. The fixed plate is slidably connected to the inner wall of the second slide groove. The bottom of the pushing block is attached to the surface of the frame. The separated sides of the rubber pads on the left and right sides are attached to the surface of the frame. The slider is inserted into the inner wall of the mounting groove. The adjacent ends of the left and right springs are installed on the inner wall of the first slide groove.

[0007] Preferably, one of the magnets 1 is installed at the bottom of the lower hook, and another magnet 1 is installed on the separated sides of the left and right hooks, a slide groove 3 is opened inside the hook, an elastic metal plate is inserted into the inner wall of the slide groove 3, a pull cloth is installed at the bottom of the elastic metal plate, and magnet 2 is installed on the adjacent sides of the left and right pull cloths;

[0008] The adjacent sides of the elastic metal plates on the left and right sides are both plugged into the bottom of the lower hook, the second magnet is fitted with the first middle magnet, and the elastic metal plates are fitted on the surface of the frame.

[0009] Preferably, a placement groove is provided on the separated sides of the left and right hooks, a rubber cover is hinged on the adjacent sides of the left and right placement grooves, a plurality of mounting rings are installed on the bottom wall of the placement groove, and a fixing rope is sleeved on the outer side of the plurality of mounting rings;

[0010] The two fixing ropes on the front side are both installed between the dense mesh, and the two ends of the fixing ropes are respectively installed between the mounting rings;

[0011] Two clamping grooves are provided on both sides of the inner wall of the mounting groove, a sliding groove four is provided inside the slider, a moving block is installed on the inner wall of the sliding groove four, and a clamping block is installed on the separated side of the moving block on the front and rear sides, and an elastic member is provided on the inner wall of the sliding groove four;

[0012] The elastic member is fitted with the moving block, and the clamping blocks on the left and right sides both pass through the slider and are respectively fitted between the clamping slots on both sides.

[0013] A construction method for dark excavation and obstacle removal close to an existing underground continuous wall of a station, including a dark excavation and obstacle removal scaffold close to an existing underground continuous wall of a station, the method comprising the following steps:

[0014] S1: Carry out MJS horizontal reinforcement under the operating station to reduce the impact of subsequent construction on the operating station;

[0015] S2: Build a scaffold at the bottom of the clearance shaft. The scaffold consists of multiple frames, and two walkway boards are installed on the upper part of the frame. At the same time, a dense mesh is laid on the front side of the frame;

[0016] S3: Horizontal drilling is used to check the reinforcement effect of the soil ahead, and grouting reinforcement is carried out if there is water leakage;

[0017] S4: The tunnel door is chiseled out, and the underground continuous wall of the clearance shaft is broken down layer by layer from top to bottom;

[0018] S5: Following the order of tunnel portal excavation, excavate the obstacle clearance well and the interbedded soil between the operating stations in layers and blocks, and carry out initial support;

[0019] S6: Gradually demolish underground continuous walls of operating stations;

[0020] S7: Backfilling of the underground excavation section.

[0021] Preferably, in said S1, φ2400mmMJS semicircular horizontal reinforcement is adopted below the bottom plate of the operating station structure, with a vertical spacing of 800mm and a horizontal spacing of 1800mm, and the piles are constructed layer by layer from bottom to top and from both sides to the middle.

[0022] Preferably, in said S2, the ground-level diagonal braces of the scaffolding are connected with steel pipes to limit the aspect ratio, or act on the stable structure, each platform is paved with walkway boards, stairs are set between the upper and lower floors, and a fence about 1.2 meters high is set on the edge, and a dense mesh and safety warning signs are hung as required;

[0023] In S2, the angle between the scaffolding's guy prop and the ground is no more than 60°. Considering the limitation of the erection space, the position of the guy prop top is changed. At the same time, the upper, middle and lower positions on both sides are connected to the main reinforcement of the ground-connected wall or the shield steel ring to form a wall connection member, thereby improving the overall stability of the entire frame.

[0024] Preferably, in S3, the exploration holes are distributed at the edge and center of the ruptured portion.

[0025] Preferably, in said S4, the tunnel door is manually removed in stages from top to bottom and from both sides to the middle, and the grid steel frame is installed and concrete is sprayed immediately after the removal is completed.

[0026] Preferably, in said S5, the interlayer soil excavation between the clearance shaft ground wall and the operating station ground wall is carried out on a scale of 50 cm, and is gradually dug from top to bottom and from both sides to the middle. After the soil is removed in layers, 4 cm of concrete is sprayed on the upper end of the hole and grid steel bars are installed.

[0027] Preferably, in S6, after the ground wall and sandwich soil of the obstacle clearance pit are secretly excavated and the initial support is completed, the ground wall of the operating station is demolished;

[0028] In S6, 300mm of the ground wall of the operating station is reserved. First, a temporary scaffold is set up to break the front ground wall. After the breaking is completed, the temporary scaffold is removed, and then the remaining 300mm thick ground wall is broken layer by layer from bottom to top. The breaking height is controlled at 1000-1100mm each time. After breaking one layer, backfill one layer. When the backfill strength below meets the conditions of the construction station, the next layer is broken and backfilled. Repeat the operation until the ground wall of the tunnel portal is broken;

[0029] In the above-mentioned S7, the dark excavation section is backfilled with C15 plain concrete, which is backfilled to the outer facade of the inner lining wall of the main body of the operating station. The side door of the clearance shaft is backfilled with M5 mortar, and the backfill range is the dark excavation section and the entire foundation pit.

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

[0031] The construction method for dark excavation and obstacle removal close to the underground continuous wall of an existing station proposed by the present invention effectively prevents the instability and damage of water and soil after losing support and protection by adopting MJS horizontal reinforcement technology, avoids the large-scale surface collapse and cracking damage that may occur in the soil inside the tunnel portal, and significantly improves construction safety. At the same time, the five-step three-step method is adopted for tunnel portal demolition, which optimizes the excavation sequence, reduces the influence of mechanical vibration load, and effectively controls the deformation of the existing structure, thereby more safely ensuring the normal operation of underground and surface buildings, and realizing fast, safe and low-cost tunnel portal demolition work, which not only speeds up the construction progress but also reduces construction risks, and has significant economic and social benefits.

[0032] At the same time, in the process of erecting the scaffolding, the coordinated cooperation between the hooks, lower hooks and rubber pads is used to effectively reduce the possibility of the walkway board sliding on the frame, thereby enhancing the stability of the walkway board installation and improving the use effect of the scaffolding. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a flow chart of the MJS pile horizontal reinforcement construction method of the present invention;

[0034] Figure 2 This is a schematic diagram of the dark excavation area of ​​the present invention;

[0035] Figure 3 This is a schematic diagram of the scaffolding erection of the present invention;

[0036] Figure 4 This is a schematic diagram of the MJS horizontal reinforcement and tunnel portal exploration hole of the present invention;

[0037] Figure 5 This is a plan and elevation view of the side excavation of the obstacle clearance well of the present invention;

[0038] Figure 6 This is a schematic diagram of the initial support of the present invention;

[0039] Figure 7 This is a schematic diagram of backfilling of the dark excavation section of the present invention;

[0040] Figure 8 This is a flow chart of the dark excavation obstacle removal method of the present invention;

[0041] Figure 9 This is a schematic diagram of a partial frame structure of the scaffold of the present invention;

[0042] Figure 10 This is a schematic diagram of the hook structure of the present invention;

[0043] Figure 11 This is a schematic diagram of the walkway plate structure of the present invention;

[0044] Figure 12 for Figure 11 Structural cross-section at AA in the middle;

[0045] Figure 13 This is a schematic diagram of the lower hook structure of the present invention;

[0046] Figure 14 This is a schematic diagram of the installation block structure of the present invention;

[0047] Figure 15 for Figure 14 Structural cross-section at the middle BB;

[0048] Figure 16 This is a schematic diagram of the structure of the fixing rope of the present invention when in use;

[0049] Figure 17 This is a schematic diagram of the fabric pulling structure of the present invention;

[0050] Figure 18 This is a schematic diagram of the structure of the installation block of the present invention after being plugged in and hidden;

[0051] Figure 19 This is a schematic diagram of the slider structure of the present invention;

[0052] Figure 20 for Figure 19 Structural cross-section at CC.

[0053] In the figure: 1. frame; 2. dense mesh; 3. walkway board; 4. hook; 5. mounting groove; 6. slider; 7. lower hook; 8. mounting block; 9. rubber pad; 10. elastic metal plate; 11. limit block; 12. slide groove one; 13. spring; 14. insert block; 15. slide groove two; 16. gear; 17. limit groove; 18. connecting plate; 19. pull cloth; 20. slide groove three; 21. placement groove; 22. rubber cover; 23. push block; 24. fixed plate; 25. movable groove; 26. fixing rope; 27. mounting ring; 28. clamping block; 29. ​​magnet one; 30. magnet two; 31. clamping groove; 32. movable block; 33. slide groove four; 34. elastic part. DETAILED DESCRIPTION

[0054] In order to clearly and completely describe the objectives and technical solutions of the present invention and make the advantages more clearly understood, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, not all of them, and are only used to explain the embodiments of the present invention, not to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0055] Example 1: Please refer to Figures 1 to 20 The present invention provides a technical solution: a scaffold for dark excavation and obstacle removal close to the underground continuous wall of an existing station, comprising a frame 1, two walkway plates 3 are installed on the upper part of the frame 1, a dense mesh 2 is provided on the front side of the frame 1, two mounting grooves 5 are provided on the left and right sides of the walkway plate 3, the inner wall of the mounting groove 5 is plugged with a mounting block 8, the front and rear sides of the mounting block 8 are both installed with a slider 6, the left and right mounting blocks 8 are both installed on the separated side with a hook 4, the inside of the hook 4 is provided with a movable groove 25, the inner wall of the movable groove 25 is plugged with a push block 23, and the outer side of the push block 23 is installed with a fixed plate. 24. An insert block 14 is provided on the top of the push block 23. A slide groove 12 is provided on the upper inner side of the mounting block 8. A limit block 11 is installed on the inner wall of the slide groove 12. Springs 13 are installed on the adjacent sides of the limit blocks 11 on both sides. The inner wall of the mounting block 8 is rotatably connected to a gear 16. A slide groove 2 is provided at the bottom of the mounting block 8. The inner wall of the slide groove 2 15 is plugged with a lower hook 7. Rubber pads 9 are installed on the separated sides of the lower hooks 7 on both sides. A limit groove 17 is provided on the adjacent sides of the left and right slide grooves 15. A connecting plate 18 is installed on the inner wall of the limit groove 17.

[0056] The adjacent sides of the left and right plug blocks 14 pass through the hook 4 and are inserted into the inner wall of the mounting block 8. The bottom of the plug block 14 is engaged with the gear 16. The separated sides of the left and right lower hook members 7 are engaged with the gear 16, and the adjacent sides are installed between the connecting plates 18. When the hook 4 is mounted on the surface of the frame 1, the gravity of the walkway plate 3 itself is used to press downward, driving the pushing block 23 to push upward, thereby driving the plug block 14 to push the gear 16 to rotate, and then driving the lower hook member 7 engaged with it to extend downward, while hooking the lower surface of the frame 1, and using the setting of the rubber pad 9 to increase the stability of the installation of the walkway plate 3 and prevent it from occurring. The sliding phenomenon, the fixed plate 24 is slidably connected to the inner wall of the slide groove 2 15, and the fixed plate 24 plays a limiting role, thereby preventing the pushing block 23 from separating from the moving groove 25, and the bottom of the pushing block 23 is in contact with the surface of the frame 1, and the separated sides of the left and right rubber pads 9 are in contact with the surface of the frame 1, so that the rubber pads 9 are used to increase the friction between the hook 4 and the lower hook 7 and the frame 1, thereby improving the anti-slip effect of the walkway plate 3 and improving its installation stability. The slider 6 is inserted into the inner wall of the installation groove 5, and the adjacent ends of the left and right springs 13 are installed on the inner wall of the slide groove 12, so that the elastic force of the spring 13 is used to facilitate the reset of the plug block 14.

[0057] When the temporary scaffolding is erected, its frame 1 is gradually erected and the walkway board 3 can be laid at this time. When the walkway board 3 is placed on the surface of the frame 1, the gravity of the walkway board 3 is used to press downward, driving the pushing block 23 to push upward along the inner wall of the movable groove 25, thereby pushing the insertion block 14 to insert into the inner wall of the mounting block 8, and driving the limit block 11 to squeeze the spring 13, while driving the gear 16 engaged with it to rotate, thereby driving the lower hook 7 to extend downward, and using the connecting plate 18 to slide on the inner wall of the limiting groove 17 to limit the lower hook 7. At this time, the rubber pad 9 will contact the lower surface of the frame 1, thereby utilizing the cooperation between the hook 4 and the lower hook 7 and the rubber pad 9 to increase the stability of the installation between the walkway board 3 and the frame 1, thereby preventing it from sliding.

[0058] Example 2: On the basis of Example 1, in order to further improve the installation effect of the walkway plate 3, one of the magnets 29 is installed at the bottom of the lower hook 7, and another magnet 29 is installed on the separated side of the left and right hooks 4. A chute 3 20 is opened inside the hook 4, and an elastic metal plate 10 is inserted into the inner wall of the chute 3 20. A pull cloth 19 is installed at the bottom of the elastic metal plate 10, and magnets 2 30 are installed on the adjacent sides of the pull cloth 19 on the left and right sides;

[0059] The adjacent sides of the left and right elastic metal plates 10 are both inserted into the bottom of the lower hook 7, the magnet 2 30 is fitted with the middle magnet 1 29, and the elastic metal plate 10 is fitted on the surface of the frame 1, so that the elastic metal plate 10 is used to connect the hook 4 and the lower hook 7 together, further improving the installation effect of the walkway plate 3. At the same time, the magnetic attraction between the magnet 1 29 and the magnet 2 30 is used to facilitate the resetting of the elastic metal plate 10.

[0060] Pulling the cloth 19 drives the elastic metal plate 10 to extend downward, and at the same time allows the elastic metal plate 10 to slide along the inner wall of the slide groove three 20, and inserts one side of the elastic metal plate 10 into the inner wall of the lower hook 7. At this time, the magnet two 30 set on one side of the cloth 19 and the magnet one 29 at the bottom of the lower hook 7 are magnetically installed to connect the hook 4 and the lower hook 7 together, and cover the frame 1, further improving the stability of the installation of the walkway plate 3.

[0061] Example 3: Based on Example 2, in order to facilitate the folding of the mounting block 8 for storage, and at the same time, to eliminate the need for additional ropes to fix the dense mesh 2 and improve the use effect of the walkway board 3, a placement groove 21 is provided on the separated sides of the left and right hooks 4, and a rubber cover plate 22 is hinged on the adjacent sides of the left and right placement grooves 21. A plurality of mounting rings 27 are installed on the bottom wall of the placement groove 21, and a fixing rope 26 is sleeved on the outer side of the plurality of mounting rings 27;

[0062] The two fixing ropes 26 on the front side are both installed between the dense mesh 2, and the two ends of the fixing ropes 26 are respectively installed between the mounting rings 27, so that the dense mesh 2 can be installed and fixed without the help of additional ropes, thereby improving the practicality of the walkway board 3;

[0063] A plurality of slots 31 are provided on both sides of the inner wall of the mounting groove 5. A fourth slide groove 33 is provided inside the slider 6. A moving block 32 is installed on the inner wall of the fourth slide groove 33. A locking block 28 is installed on the separated side of the front and rear moving blocks 32. An elastic member 34 is provided on the inner wall of the fourth slide groove 33.

[0064] The elastic member 34 is arranged on the inner wall of the slide groove 33, and the left and right side blocks 28 both pass through the slider 6 and are respectively fitted between the two side slots 31. When not in use, push it toward the middle of the walkway plate 3 to insert the mounting block 8 into the inner wall of the mounting groove 5. At the same time, the two blocking blocks 28 are engaged with the two middle slots 31, thereby facilitating the storage of the walkway plate 3.

[0065] When use is finished, the fixing rope 26 is retracted into the two hooks 4 on the front side, and the rubber cover 22 is closed. Then, the magnet 2 30 on the side of the cloth 19 is separated from the magnet 1 29 at the bottom of the lower hook 7, and the elastic metal plate 10 is retracted to the inner wall of the hook 4, and the magnetic installation between the magnet 2 30 and the magnet 1 29 on the side of the hook 4 is used to fix the elastic metal plate 10. After completion, the walkway plate 3 is pulled upwards. At this time, the elastic force of the spring 13 is used to drive the limit block 11 to move along the inner wall of the slide groove 12, and drive the plug block 14 to follow the movement of the walkway plate 3 and gradually plug into the inner wall of the hook 4. At the same time, the push block 23 is pushed downwards. At this time, the lower hook 7 will follow the reset of the plug block 14 and gradually retract to the inner wall of the slide groove 2 15. When the hook 7 is fully retracted to the inner wall of the second slide groove 15, the walkway board 3 can be taken out upward to separate it from the frame 1, and then the mounting block 8 can be pushed toward the middle of the walkway board 3, thereby driving the two blocking blocks 28 to be gradually pushed to the inner wall of the mounting groove 5, and at the same time driving the moving block 32 to squeeze the elastic member 34 and compress it. At this time, the blocking blocks 28 are separated from the blocking grooves 31 on both sides, and continue to push the mounting block 8, allowing the two sliders 6 to be inserted along the inner wall of the mounting groove 5. When the mounting block 8 is fully reset, the elastic force of the elastic member 34 is used to drive the two blocking blocks 28 to be inserted into the inner wall of the blocking groove 31 in the middle, thereby facilitating the retraction of the mounting block 8 to the inner wall of the walkway board 3 for the subsequent storage of the walkway board 3, thereby improving the use effect of the walkway board 3.

[0066] Example 4: Based on Example 3, a method for dark excavation and obstacle removal close to the underground continuous wall of an existing station is proposed, including a dark excavation and obstacle removal scaffolding close to the underground continuous wall of an existing station. The method includes the following steps:

[0067] S1: Carry out MJS horizontal reinforcement under the operating station to reduce the impact of subsequent construction on the operating station;

[0068] S2: Build a scaffold at the bottom of the clearance shaft, and fine-tune the platform height and size according to the actual situation on site. The scaffold consists of multiple frames 1, and two walkway boards 3 are installed on the upper part of the frame 1. At the same time, a dense mesh 2 is laid on the front side of the frame 1;

[0069] S3: Horizontal drilling is used to check the reinforcement effect of the soil ahead, and grouting reinforcement is carried out if there is water leakage;

[0070] S4: The tunnel door is chiseled out, and the underground continuous wall of the clearance shaft is broken down layer by layer from top to bottom;

[0071] S5: Following the order of tunnel portal excavation, excavate the obstacle clearance well and the interbedded soil between the operating stations in layers and blocks, and carry out initial support;

[0072] S6: Gradually demolish underground continuous walls of operating stations;

[0073] S7: backfilling of the tunneling section.

[0074] The interchange design between the Lijing South Road Station of Ningbo Rail Transit Line 8 and the Lijing South Road Station of the already operated Line 2. In order to meet the condition of the shield section of Line 8 underpassing the Lijing South Road Station of Line 2, a clearance work shaft is set to break the diaphragm wall of the Lijing South Road Station of Line 2 by tunneling;

[0075] After scheme comparison, the cost of modifying the cutter head of the shield machine is high and the irreversible deformation of the structure of the operating station will be caused during the wall grinding period. Considering the geological characteristics of the soft soil in Ningbo coastal area, it is confirmed that the micro-disturbance clearance construction by tunneling method is adopted;

[0076] When the clearance construction by tunneling is carried out close to the underground diaphragm wall of the existing station, the water and soil lose support and protection, and the soil inside the hole is extremely easy to be unstable and damaged, thus causing large-scale surface collapse and cracking damage, leading to construction safety accidents, and the safety risk is extremely great. Therefore, the ground reinforcement under the operating station before tunneling, the clearance tunneling technology and the improvement of safety measures are the key points of the clearance tunneling;

[0077] When the hole is broken and the sandwich soil is excavated, various measures are adopted to reduce the unsupported exposure time, prevent structural instability and collapse, and safely and successfully remove the hole for sandwich soil excavation. The underground diaphragm wall of the operating station is the key point of the construction, especially the breaking of the underground diaphragm wall of the operating station;

[0078] The length of the clearance tunneling construction section is relatively short, but it is close to the operating station, and even the diaphragm wall of the operating station needs to be broken;

[0079] It is extremely easy to cause uneven deformation of the structure and large shear force of the wall. The breaking and excavation sequence needs to be strictly controlled during the tunneling process, and gradual unloading and timely support are needed to ensure the stability of the operating station.

[0080] When the scaffolding is in use, the frame 1 is gradually erected and the walkway board 3 can be laid. When the walkway board 3 is placed on the surface of the frame 1, the gravity of the walkway board 3 is used to press downward, driving the pushing block 23 to push upward along the inner wall of the movable groove 25, thereby pushing the inserting block 14 to insert into the inner wall of the mounting block 8, and driving the limiting block 11 to squeeze the spring 13, while driving the gear 16 engaged with it to rotate, thereby driving the lower hook 7 to extend downward, and using the connecting plate 18 to slide on the inner wall of the limiting groove 17 to limit the lower hook 7. At this time, the rubber pad 9 will contact the lower surface of the frame 1, thereby using the hanging The cooperation between the hook 4 and the lower hook 7 and the rubber pad 9 increases the stability of the installation between the walkway board 3 and the frame 1, thereby preventing it from sliding. After the installation is completed, the pull cloth 19 is pulled to drive the elastic metal plate 10 to extend downward, and at the same time, the elastic metal plate 10 is allowed to slide along the inner wall of the slide groove 3 20, and one side of the elastic metal plate 10 is inserted into the inner wall of the lower hook 7. At this time, the magnet 2 30 set on one side of the pull cloth 19 is magnetically installed with the magnet 1 29 at the bottom of the lower hook 7, so that the hook 4 and the lower hook 7 are connected together, and the frame 1 is covered, further improving the stability of the installation of the walkway board 3;

[0081] When installing the dense mesh net 2, the dense mesh net 2 is placed on the front side of the frame 1, and the two rubber cover plates 22 on the front side are opened at the same time. The fixing rope 26 on the inner wall of the placement groove 21 is taken out and wound between the dense mesh net 2 and the frame 1, and then wound again between the mounting ring 27 on the inner wall of the placement groove 21 for installation. In this way, the dense mesh net 2 can be installed without the help of additional ropes, thereby improving the practicality and use effect of the walkway board 3.

[0082] When use is finished, the fixing rope 26 is retracted into the two hooks 4 on the front side, and the rubber cover 22 is closed. Then, the magnet 2 30 on the side of the cloth 19 is separated from the magnet 1 29 at the bottom of the lower hook 7, and the elastic metal plate 10 is retracted to the inner wall of the hook 4, and the magnetic installation between the magnet 2 30 and the magnet 1 29 on the side of the hook 4 is used to fix the elastic metal plate 10. After completion, the walkway plate 3 is pulled upwards. At this time, the elastic force of the spring 13 is used to drive the limit block 11 to move along the inner wall of the slide groove 12, and drive the plug block 14 to follow the movement of the walkway plate 3 and gradually plug into the inner wall of the hook 4. At the same time, the push block 23 is pushed downwards. At this time, the lower hook 7 will follow the reset of the plug block 14 and gradually retract to the inner wall of the slide groove 2 15. When the hook 7 is fully retracted to the inner wall of the second slide groove 15, the walkway board 3 can be taken out upward to separate it from the frame 1, and then the mounting block 8 can be pushed toward the middle of the walkway board 3, thereby driving the two blocking blocks 28 to be gradually pushed to the inner wall of the mounting groove 5, and at the same time driving the moving block 32 to squeeze the elastic member 34 and compress it. At this time, the blocking blocks 28 are separated from the blocking grooves 31 on both sides, and continue to push the mounting block 8, allowing the two sliders 6 to be inserted along the inner wall of the mounting groove 5. When the mounting block 8 is fully reset, the elastic force of the elastic member 34 is used to drive the two blocking blocks 28 to be inserted into the inner wall of the blocking groove 31 in the middle, thereby facilitating the retraction of the mounting block 8 to the inner wall of the walkway board 3 for the subsequent storage of the walkway board 3, thereby improving the use effect of the walkway board 3.

[0083] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A scaffold for clearing obstacles by dark excavation close to an existing underground continuous wall of a station, comprising a frame (1), two walkway plates (3) being installed on the upper part of the frame (1), and a dense mesh (2) being provided on the front side of the frame (1), characterized in that: The walkway plate (3) has two mounting grooves (5) on both sides, the inner wall of the mounting groove (5) is plugged with a mounting block (8), the front and rear sides of the mounting block (8) are both installed with sliders (6), the left and right sides of the mounting blocks (8) are both installed with hooks (4), the inside of the hook (4) is provided with a moving groove (25), the inner wall of the moving groove (25) is plugged with a pushing block (23), the outer side of the pushing block (23) is installed with a fixed plate (24), the top of the pushing block (23) is provided with an insert block (14), the upper side of the inner side of the mounting block (8) is provided with a slide groove (12), a limit block (11) is installed on the inner wall of the slide groove (12), and a spring (13) is installed on the adjacent side of the limit blocks (11) on the left and right sides. The inner wall of the mounting block (8) is rotatably connected with a gear (16). A slide groove (15) is provided at the bottom of the mounting block (8), and a lower hook (7) is inserted into the inner wall of the slide groove (15). A rubber pad (9) is installed on the separated side of the lower hook (7) on the left and right sides. A limit groove (17) is provided on the adjacent side of the slide groove (15) on the left and right sides, and a connecting plate (18) is installed on the inner wall of the limit groove (17); The adjacent sides of the plug blocks (14) on the left and right sides pass through the hook (4) and are inserted into the inner wall of the mounting block (8). The bottom of the plug block (14) is engaged with the gear (16). The separated sides of the lower hooks (7) on the left and right sides are engaged with the gear (16), and the adjacent sides are installed between the connecting plate (18). The fixed plate (24) is slidably connected to the inner wall of the second slide groove (15). The bottom of the push block (23) is attached to the surface of the frame (1). The separated sides of the rubber pads (9) on the left and right sides are attached to the surface of the frame (1). The slider (6) is inserted Connected to the inner wall of the mounting groove (5), the adjacent ends of the springs (13) on the left and right sides are mounted on the inner wall of the slide groove (12); one of the magnets (29) is mounted on the bottom of the lower hook (7), and the other magnet (29) is mounted on the separated sides of the hooks (4) on the left and right sides; a slide groove (20) is provided inside the hook (4), an elastic metal plate (10) is inserted into the inner wall of the slide groove (20), a pull cloth (19) is mounted on the bottom of the elastic metal plate (10), and magnets (30) are mounted on the adjacent sides of the pull cloth (19) on the left and right sides; The adjacent sides of the elastic metal plates (10) on the left and right sides are plugged into the bottom of the lower hook (7), the second magnet (30) is fitted with the middle magnet (29), and the elastic metal plates (10) are fitted on the surface of the frame (1).

2. The scaffolding for clearing obstacles by digging underground continuous walls close to existing stations according to claim 1 is characterized in that: A placement groove (21) is provided on the separated sides of the hooks (4) on the left and right sides, and a rubber cover plate (22) is hingedly connected to the adjacent sides of the placement grooves (21) on the left and right sides. A plurality of mounting rings (27) are installed on the bottom wall of the placement groove (21), and a fixing rope (26) is sleeved on the outer side of the plurality of mounting rings (27); The two fixing ropes (26) on the front side are both installed between the dense mesh (2), and the two ends of the fixing ropes (26) are respectively installed between the mounting rings (27); Two clamping grooves (31) are provided on both sides of the inner wall of the installation groove (5), a sliding groove (33) is provided inside the slider (6), a moving block (32) is installed on the inner wall of the sliding groove (33), and a clamping block (28) is installed on the separated side of the moving block (32) on the front and rear sides, and an elastic member (34) is provided on the inner wall of the sliding groove (33); The elastic member (34) is fitted with the movable block (32), and the clamping blocks (28) on the left and right sides both pass through the slider (6) and are respectively fitted between the clamping slots (31) on both sides.

3. A construction method for dark excavation and obstacle removal close to an existing underground continuous wall of a station, using the dark excavation and obstacle removal scaffolding close to an existing underground continuous wall of a station according to any one of claims 1-2, characterized in that: The method comprises the following steps: S1: Carry out MJS horizontal reinforcement under the operating station to reduce the impact of subsequent construction on the operating station; S2: A scaffold is set up at the bottom of the clearance shaft, the scaffold is composed of a plurality of frames (1), and two walkway boards (3) are set up on the upper part of the frames (1), and a dense mesh (2) is laid on the front side of the frames (1); S3: Horizontal drilling is used to check the reinforcement effect of the soil ahead, and grouting reinforcement is carried out if there is water leakage; S4: The tunnel door is chiseled out, and the underground continuous wall of the clearance shaft is broken down layer by layer from top to bottom; S5: Following the order of tunnel portal excavation, excavate the obstacle clearance well and the interbedded soil between the operating stations in layers and blocks, and carry out initial support; S6: Gradually demolish underground continuous walls of operating stations; S7: Backfilling of the underground excavation section.

4. The construction method of a scaffolding for concealed excavation and obstacle removal close to an existing underground continuous wall of a station according to claim 3 is characterized in that: In said S2, the ground-level diagonal braces of the scaffolding are connected with steel pipes to limit the length-to-curvature ratio, or act on the stable structure, a walkway board (3) is laid on each platform, a staircase is set between the upper and lower floors, a 1.2-meter-high enclosure is set on the edge, and a dense mesh (2) and safety warning signs are hung as required; In S2, the angle between the scaffolding's guy prop and the ground is no more than 60°. Considering the limitation of the erection space, the position of the guy prop top is changed. At the same time, the upper, middle and lower positions on both sides are connected to the main reinforcement of the ground-connected wall or the shield steel ring to form a wall connection member, thereby improving the overall stability of the entire frame.

5. The construction method of a scaffolding for concealed excavation and obstacle removal close to an existing underground continuous wall of a station according to claim 3 is characterized in that: In the above-mentioned S3, the exploration holes are distributed at the edge and center of the broken part.

6. The construction method of a scaffolding for dark excavation and obstacle removal close to an existing underground continuous wall of a station according to claim 3 is characterized in that: In the above-mentioned S4, the tunnel door is manually removed in stages from top to bottom and from both sides to the middle. After the removal is completed, the grid steel frame is immediately installed and concrete is sprayed.

7. The construction method of a scaffolding for dark excavation and obstacle removal close to an existing underground continuous wall of a station according to claim 3 is characterized in that: In the above-mentioned S5, the interlayer soil between the clearance shaft ground wall and the operating station ground wall is excavated with a scale of 50 cm, and is gradually excavated from top to bottom, from both sides to the middle. After the soil is removed layer by layer, 4 cm of concrete is sprayed on the upper end of the hole and grid steel bars are installed.

8. The construction method of a scaffolding for concealed excavation and obstacle removal close to an existing underground continuous wall of a station according to claim 3 is characterized in that: In S6, after the underground excavation of the obstacle clearance pit ground wall and sandwich soil is completed and the initial support is completed, the ground wall of the operating station is demolished; In S6, 300mm of the ground wall of the operating station is reserved. First, a temporary scaffold is set up to break the front ground wall. After the breaking is completed, the temporary scaffold is removed, and then the remaining 300mm thick ground wall is broken layer by layer from bottom to top. The breaking height is controlled at 1000-1100mm each time. After breaking one layer, backfill one layer. When the backfill strength below meets the conditions of the construction station, the next layer is broken and backfilled. Repeat the operation until the ground wall of the tunnel portal is broken; In the above-mentioned S7, the dark excavation section is backfilled with C15 plain concrete, which is backfilled to the outer facade of the inner lining wall of the main body of the operating station. The side door of the clearance shaft is backfilled with M5 mortar, and the backfill range is the dark excavation section and the entire foundation pit.

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