Construction assembly and method for shielded grinding of a wall without reservation and reinforcement

Abstract

The present application relates to the technical field of diaphragm wall removal and reinforcement construction, in particular to a shield removal and reinforcement construction accessory and method for diaphragm walls without reserved diaphragm walls, wherein the shield removal and reinforcement construction accessory for diaphragm walls without reserved diaphragm walls comprises a diaphragm wall and an outer sleeve, the outer sleeve is placed directly above the diaphragm wall, and the outer sleeve is composed of a plurality of sleeve bodies, and a threaded sleeve is threadedly connected between the sleeve bodies on the upper and lower sides; the beneficial effect is that the vertical MJS reinforcement and horizontal MJS reinforcement technologies are combined, the vertical MJS reinforcement link focuses on suppressing the horizontal movement of the diaphragm wall, and the horizontal MJS reinforcement link is committed to preventing the sinking of the main structure of the station, which not only makes the construction operation simple and practical, but also has wide applicability, and the connecting sleeve with a special-shaped block is installed and arranged on the lower side of the outer sleeve, so that the multiple sections of piles connected by grouting are more stable, and the processing effect is higher, thereby providing strong technical support for the high-quality development of urban rail transit.

Description

Technical Field

[0001] The invention relates to the technical field of grinding and reinforcing ground diaphragm walls, and in particular to a construction accessory and a construction method for grinding and reinforcing unreserved ground diaphragm walls through a shield machine. Background Art

[0002] With the rapid development of urbanization, the rational use of underground space has become increasingly important. As subway networks gradually develop, new subway tunnels may need to fully penetrate existing subway tunnels or other underground structures, such as retaining walls. These retaining walls typically serve as retaining structures to ensure the safety and stability of underground projects. Fiberglass rebar is typically used for underground continuous wall reinforcement along planned tunnel routes. Its material properties, such as high tensile strength, excellent corrosion resistance, low shear strength, and brittle fracture resistance, ensure smooth passage through subways and tunnel boring machines.

[0003] During the construction process, shield machines facing technical and safety challenges when crossing ground-connected walls. On the one hand, shield crossing may affect existing underground structures, such as causing ground subsidence or structural deformation. On the other hand, the construction of ground-connected walls requires special techniques (such as the MJS method) and equipment (such as outer casing, drilling rigs, installation of orifice sealing and anti-spouting devices, etc.) to ensure the smooth progress of construction and the safety of existing structures. Therefore, pre-construction reinforcement is particularly important, and during the shield crossing process, it is necessary to effectively manage possible risks, such as unstable strata and sudden water inrush. Otherwise, damage may be caused to the ground-connected wall and surrounding structures, such as cracks or deformation, posing a threat to the safety of existing structures.

[0004] At the same time, when using the MJS method for reinforcement and using the outer sleeve for multiple jet grouting, the upper surface of the reinforcement body formed by the grouting is generally flat, and then the bottom surface of the next grouting will be combined with the solidified upper surface of the previous grouting when it is not solidified. If the stirring between the two groutings is not sufficient, the new slurry will not be able to completely penetrate into the solidified reinforcement body, forming local incomplete mixing areas. These areas may become weak points in the structure, affecting the overall uniformity and stability. For this reason, those skilled in the art now propose a shield grinding and reinforcement construction accessory and construction method for removing unreserved ground walls and reinforcing to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a shield machine for grinding away unreserved ground ties and reinforcing construction accessories and a construction method, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a construction accessory for reinforcing a shield-machined ground wall without a reserved ground connection wall, comprising a ground connection wall and an outer sleeve, the outer sleeve being placed directly above the ground connection wall, the outer sleeve being composed of a plurality of sleeve bodies, a threaded sleeve being threadedly connected between the sleeve bodies on the upper and lower sides, a connecting sleeve being externally threadedly connected to the bottom end of the lower sleeve body, a plurality of placement grooves being provided on the outside of the connecting sleeve, a micro motor being fixedly connected inside the placement groove, an output end of the micro motor being fixedly connected to a rotating shaft, the rotating shaft being rotatably connected inside the placement groove, a placement block being fixedly connected outside the rotating shaft, a plurality of protrusions being installed outside the placement block, the placement block being movably connected inside the placement groove, a mounting block being fixedly connected to the lower side of the inner wall of the placement groove, a connecting groove being provided inside the mounting block, a push rod second being slidably connected inside the connecting groove, a special-shaped block being fixedly connected to the bottom end of the push rod second, a plurality of grooves being provided on the outside of the special-shaped block, the special-shaped block being slidably connected inside the connecting sleeve, and two cleaning brushes being slidably connected to the outside of the special-shaped block.

[0007] Preferably, the inner sides of the plurality of placement blocks are fixedly connected with a slider 1, the lower side of the slider 1 is an inclined surface, the slider 1 is movably connected to the inside of the placement slot, a limiting slot is provided inside the bottom end of the slider 1, the limiting slot is inclined, the internal sliding connection of the limiting slot is connected to the limiting block, the bottom end of the limiting block is fixedly connected with a slider 2, the upper side of the slider 2 is an inclined surface, the inclined surface of the slider 2 slides with the inclined surface of the slider 1, the slider 2 is slidably connected to the inside of the placement slot, the bottom end of the slider 2 is fixedly connected with a push rod 1, the bottom end of the push rod 1 is fixedly connected with a connecting block, the connecting block is fixedly connected to the top end of the push rod 2, and the outer sleeve of the push rod 2 is provided with an elastic member.

[0008] Preferably, a plurality of mounting grooves are provided on the lower inner side of the connecting sleeve, a fixed block is fixedly connected to the inner side of the mounting groove, a plurality of slide grooves are provided inside the fixed block, a rubber block is fixedly connected to the inner wall of the slide groove, the other end of the rubber block is fixedly connected to a push plate, the push plate is slidably connected to the inside of the slide groove, the other end of the push plate is fixedly connected to a slide rod, the slide rod is slidably connected to the inside of the slide groove, and the end of the slide rod away from the push plate is fixedly connected to the cleaning brush.

[0009] Preferably, one end of the elastic member is fixedly connected to the inner wall of the connecting groove, the other end of the elastic member is fixedly connected to the bottom end of the connecting block, the connecting block is slidably connected to the inside of the connecting groove, and the push rod is slidably connected to the inside of the connecting groove.

[0010] A construction method for reinforcing a shield-bored wall by grinding away unreserved ground, the method comprising the following steps:

[0011] Step one, vertical MJS reinforcement before the first wall;

[0012] Step two, horizontal MJS reinforcement below the main structure of the station;

[0013] Step three, shield machine crossing the vertical MJS reinforcement area;

[0014] Step four, shield machine grinding the first wall;

[0015] Step five, shield machine crossing the horizontal MJS reinforcement area;

[0016] Step six, shield machine grinding the second wall.

[0017] Preferably, the construction process of the vertical MJS reinforcement is as follows: according to the design drawing pile arrangement requirements and benchmark control network, the reinforcement range is measured, and the position points of each pile are positioned; in order to ensure the smooth drilling of MJS rotary jetting pile, the original pavement is broken to the original soil layer, a trench is excavated for drainage and storage of returned slurry to prevent difficult drilling and slurry overflow; according to the designed plane position and construction angle, the drilling machine is positioned on the designed hole position; the hole is drilled by special hole drilling equipment according to the positioned position and angle to the designed depth; after the hole is drilled by the drilling machine, the outer sleeve pipe is lowered, the outer sleeve pipe is pulled back, then the drill rod is lowered, grouting is sprayed to the outer sleeve pipe, the outer sleeve pipe is pulled back again, grouting is sprayed to the outer sleeve pipe again, then all the outer sleeve pipes are removed, and grouting is sprayed to the designed elevation.

[0018] Preferably, the construction process of the horizontal MJS reinforcement is as follows: first, measure and place the pile position, ensure accuracy through hole outside control measurement and triangular network layout, and confirm that the pile position error is not more than 5mm after acceptance, then carry out equipment installation and debugging, including leveling the working platform, digging and setting the drainage channel, and checking the equipment operation to ensure safety and hole position error control within ±50mm, then open the hole and bury the sealing device to prevent sudden gushing, after the power head is adjusted and fixed, the hole drilling is carried out, the underground continuous wall is penetrated and the drill rod is pulled back in time, the next steps include pile machine positioning, slurry preparation, rod pulling and grouting, to ensure smooth construction and realization of the final reinforcement effect.

[0019] Preferably, the construction method of the shield machine crossing the wall is as follows:

[0020] First step, the subway station floor needs to be surveyed before shield tunnel construction, the tunnel structure deformation is analyzed, the safety is communicated with the operation unit, the property right and operation unit are coordinated before the shield crossing, the train timetable is obtained, the construction time is reasonably arranged, the MJS reinforcement body is core detected before crossing to ensure that the quality meets the standard, the detection points are not less than 1% of the pile number, and the strength is not less than 1.0Mpa;

[0021] The second step is to select the first 50 rings of the shield tunnel as the test section before construction to determine the optimal propulsion parameters and ground settlement rules. The test section tasks include collecting propulsion parameters, adjusting the shield posture, familiarizing with grouting operations, measuring the initial setting time of dual-liquid slurry, testing the filling effect, and monitoring the roadbed and track conditions. The goal is to determine the effective injection volume of mud, the optimal slag improvement parameters, and the excavation parameters to control surface settlement. The task of the crossing section is to strictly control the construction parameters to ensure that the roadbed and track settlement is controllable. The task of the post-crossing section is to take measures such as grouting according to the monitoring data to ensure the stability of the tunnel. The test results are used to predict the impact of the station on the construction and optimize the construction parameters. When the shield tunnel is crossing, it is necessary to debug the equipment, reasonably set the soil pressure, control the propulsion speed, synchronize the grouting, maintain the soil bin pressure, strengthen monitoring, and establish an on-site duty team to evaluate the monitoring data in a timely manner.

[0022] Step 3: Shield tunneling through the crossing section: After grinding away the first diaphragm wall, the tunnel passes through the subway station floor, and then grinds away the second diaphragm wall;

[0023] Step 4: Set the crossing parameters.

[0024] Preferably, the tool configuration is arranged in five height steps: the first layer is the center knife, with a knife height of 180mm, and its main function is to enter the soil in advance and stabilize the posture; the second layer is mainly composed of replaceable edge rollers, front-bolted replaceable tearing knives and inner roller track welded tearing knives, with a knife height of 140mm, and its main function is to cut reinforced concrete; the third layer is mainly composed of outer peripheral welded tearing knives, with a knife height of 130mm, and the same track as the roller, and its main function is to protect the roller and assist the roller in cutting concrete; the fourth layer is mainly composed of welded tearing knives, with a knife height of 100mm, and its main function is to still have the ability to cut walls after the first three layers of knives are worn; the fifth layer is a scraper, with a knife height of 80mm, and its main function is to collect the debris into the soil bin.

[0025] Preferably, the crossing parameter setting includes:

[0026] In terms of soil pressure, when entering the reinforcement area, the soil pressure was consistent with that before the reinforcement area; when grinding the first wall, the upper soil pressure was 0.02MPa lower than that in the reinforcement area. After the wall grinding was completed, the soil pressure was adjusted according to the real-time monitoring of the station;

[0027] In terms of excavation speed, after entering the MJS reinforcement area, the excavation speed is controlled at 30mm / min. When the cutterhead begins to grind the wall, the speed is controlled at 3mm / min, and a low-speed pump is used in slow mode to ensure that the cutter can effectively grind the ground wall concrete. Considering the outward extension of the ground wall, the speed needs to be reduced 20cm in advance. The relative position simulation is back-calculated using the incision mileage.

[0028] In terms of thrust, the thrust ranges from 1200t to 1900t during the wall grinding stage. Specifically, when the cutter on one side of the shield machine contacts the ground wall and begins grinding, the thrust does not change significantly and remains stable in the range of 1300-1400t. When the center cutter enters, the thrust rises to the range of 1400-1900t, and gradually decreases after the center cutter exits the ground wall.

[0029] In terms of torque, when the cutter on one side of the shield machine contacts the ground wall and begins to grind the wall, the torque increases relatively steadily and stabilizes in the range of 1500 to 3000 kN·m. When the center cutter enters, the torque begins to increase significantly. When the entire cutterhead panel is in the ground wall, the torque reaches a peak and remains in the range of 3000 to 4000 kN·m. When the cutter on one side exits the ground wall, the cutterhead torque begins to gradually decrease.

[0030] Slag improvement: Use foam and bentonite to improve and cool the slag. The dilution ratio of the foam agent stock solution is 2%. Try not to use air for mixing and injection to avoid excessive fluctuations in soil pressure that may cause station settlement. The flow rate of the foam solution is adjusted according to the cutter head torque, and the control range is about 120L / min. When using foam, it is used in conjunction with a mud pump and water. Slag sample analysis is carried out during the excavation process, and the improvement parameters are dynamically evaluated and adjusted. If the temperature is high, add ice cubes to the bentonite box to cool it down.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The present invention proposes a construction accessory and construction method for shield grinding away unreserved ground-connected walls and reinforcement, which integrates vertical MJS reinforcement and horizontal MJS reinforcement technologies. The vertical MJS reinforcement link focuses on curbing the horizontal movement of the ground-connected walls, while the horizontal MJS reinforcement link is dedicated to preventing the sinking of the main structure of the station. It not only makes the construction operation simple and practical, but also has wide applicability. A connecting sleeve with special-shaped blocks is installed on the lower side of the outer casing, so that the multi-section pile connection formed by grouting is more stable, thereby making the processing effect higher, providing strong technical support for the high-quality development of urban rail transit. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagram of the process flow of the construction method of the present invention;

[0034] Figure 2 This is a schematic diagram of the construction of the present invention;

[0035] Figure 3 This is a schematic diagram of the outer sleeve structure of the present invention;

[0036] Figure 4 This is a schematic structural diagram of the threaded sleeve of the present invention;

[0037] Figure 5 For the present invention Figure 4 Structural cross-section at AA in the middle;

[0038] Figure 6 For the present invention Figure 4 Structural cross-section at the middle BB;

[0039] Figure 7 For the present invention Figure 6 A magnified view of the structure at center A;

[0040] Figure 8 For the present invention Figure 4 Structural cross-section at the middle CC;

[0041] Figure 9 For the present invention Figure 8 A magnified view of the structure at point B in the middle;

[0042] Figure 10 It is a schematic diagram of the block structure of the present invention;

[0043] Figure 11 For the present invention Figure 10 Structural cross-section at DD in the middle.

[0044] In the figure: 1. sleeve body; 2. connecting sleeve; 3. placement groove; 4. micro motor; 5. rotating shaft; 6. placement block; 7. slider 1; 8. limiting groove; 9. limiting block; 10. push rod 1; 11. mounting block; 12. connecting block; 13. push rod 2; 14. elastic member; 15. special-shaped block; 16. mounting groove; 17. fixing block; 18. slide groove; 19. rubber block; 20. push plate; 21. slide rod; 22. cleaning brush; 23. slider 2; 24. threaded sleeve; 25. connecting groove; 26. outer sleeve. DETAILED DESCRIPTION

[0045] 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.

[0046] Example 1: Please refer to Figures 1 to 11The present invention provides a technical solution: a construction accessory for reinforcing a shield-torn ground wall without a reserved ground connection wall, comprising a ground connection wall and an outer sleeve 26, the outer sleeve 26 is placed just above the ground connection wall, the outer sleeve 26 is composed of a plurality of sleeve bodies 1, a threaded sleeve 24 is threadedly connected between the sleeve bodies 1 on the upper and lower sides, the bottom end of the sleeve body 1 on the lower side is externally threadedly connected to a connecting sleeve 2, a plurality of placement grooves 3 are provided on the outside of the connecting sleeve 2, and the connecting sleeve 2 can be selectively installed. When it is necessary to increase the contact area of ​​the pile, the connecting sleeve 2 is installed at the bottom end of the lower sleeve body 1, thereby making the use more flexible. A micro motor 4 is fixedly connected to the inside of the placement groove 3, and the placement groove 3 provides an installation space for the micro motor 4. The output end of the micro motor 4 is fixedly connected to a rotating shaft 5, and the rotating shaft 5 is rotatably connected to the inside of the placement groove 3. The placement groove 3 limits the micro motor 4 so that the micro motor 4 can rotate smoothly. The outside of the rotating shaft 5 is fixedly connected to a placement block 6, and a plurality of protrusions are installed on the outside of the placement block 6. The design enables the pile to form a more rugged shape. The placement block 6 is movably connected to the inside of the placement groove 3. The placement groove 3 limits the placement block 6 so that the placement block 6 will not deviate when it moves. The lower side of the inner wall of the placement groove 3 is fixedly connected to the mounting block 11. The interior of the mounting block 11 is provided with a connecting groove 25. The interior of the connecting groove 25 is slidably connected to the push rod 2 13. The connecting groove 25 limits the push rod 2 13 so that the push rod 2 13 will not deviate when it slides. The bottom end is fixedly connected to a special-shaped block 15, and a plurality of grooves are provided on the outside of the special-shaped block 15. The special-shaped block 15 enables the pile to form a more rugged shape. The special-shaped block 15 is slidably connected to the inside of the connecting sleeve 2. The connecting sleeve 2 limits the special-shaped block 15, so that the special-shaped block 15 will not deviate when moving. The outside of the special-shaped block 15 is slidably connected to two cleaning brushes 22, which are used to clean the special-shaped block 15, so that the special-shaped block 15 is tidy after entering the inside of the connecting sleeve 2.

[0047] During grouting, by starting the micro motor 4, the micro motor 4 is able to drive the rotating shaft 5 to rotate, and then the rotating shaft 5 is able to drive the placement block 6 to rotate, so that the placement block 6 can be moved out from the placement groove 3, and the push rod 2 13 is moved downward, so that the push rod 2 13 is able to push the special-shaped block 15 to move out from the inside of the connecting sleeve 2. At this time, grouting is carried out so that the upper surface of the grouting exceeds the bottom end height of the connecting sleeve 2 by 50 cm, so that the shape formed by the grouting is relatively rugged, and then when the second grouting is carried out, the slurry is able to enter the relatively rugged reserved groove reserved for the first grouting. At this time, the reserved groove left by the placement block 6 prevents the two piles from deviating up and down, and the reserved groove left by the special-shaped block 15 prevents the two piles from deviating left and right, so that the pile connection stability is higher, and the vertical MJS reinforcement can curb the horizontal movement of the ground-connected wall, and the horizontal MJS reinforcement technology can prevent the sinking of the main structure of the station.

[0048] Embodiment 2: On the basis of embodiment 1, in order to realize the convenient movement of special-shaped blocks 15, the inner sides of multiple placement blocks 6 are fixedly connected with slider 1 7, the lower side of slider 1 7 is an inclined surface, and slider 1 7 is movably connected to the inside of the placement groove 3. A limiting groove 8 is provided inside the bottom end of slider 1 7, and the limiting groove 8 is inclined. The internal sliding connection of the limiting groove 8 is a limiting block 9, and the limiting groove 8 plays a limiting role on the limiting block 9, so that the limiting block 9 can slide smoothly. The bottom end of the limiting block 9 is fixedly connected with slider 2 23, and the limiting block 9 is used to connect slider 2 23. The upper side of slider 2 23 is an inclined surface, and the inclined surface of slider 2 23 slides with the inclined surface of slider 1 7, so that when slider 1 7 rotates, slider 1 7 can move slider 2 23 downward. The connecting groove 25 is provided with an elastic member 14, one end of the elastic member 14 is fixedly connected to the inner wall of the connecting groove 25, and the other end of the elastic member 14 is fixedly connected to the bottom end of the connecting block 12.

[0049] When the slider 1 7 follows the placement block 6 to move, the inclined surface on the lower side of the slider 1 7 is able to slide on the slider 2 23, so that the slider 2 23 is pushed downward by the slider 1 7, and the slider 2 23 is able to push the push rod 1 10 to move downward. At this time, the limit block 9 is able to slide inside the limit groove 8, so that the push rod 1 10 is able to push the connecting block 12 to move downward, and the connecting block 12 is able to push the special-shaped block 15 downward through the push rod 2 13, so that the special-shaped block 15 is able to detach from the inside of the connecting sleeve 2, and at the same time the connecting block 12 is able to squeeze the elastic member 14 to produce deformation. On the contrary, when the placement After the placement block 6 enters the placement groove 3, the slider 1 7 gradually moves to a horizontal state, so that the limit block 9 can slide in the opposite direction inside the limit groove 8, so that the limit block 9 can pull the slider 2 23 to move upward, and the slider 2 23 can pull the connecting block 12 upward through the push rod 10. At this time, the elastic member 14 can perform a reset movement, so that the elastic member 14 can push the connecting block 12 to move upward, and the connecting block 12 can smoothly pull the special-shaped block 15 upward, so that the special-shaped block 15 can enter the interior of the connecting sleeve 2, and the sleeve body 1 can be pulled back at this time.

[0050] Example 3: On the basis of Example 2, in order to make the special-shaped block 15 enter the interior of the connecting sleeve 2 more neatly, a plurality of mounting grooves 16 are provided on the lower side of the interior of the connecting sleeve 2. The mounting grooves 16 match the special-shaped block 15. The interior of the mounting grooves 16 is fixedly connected with a fixed block 17. The mounting grooves 16 provide installation space for the fixed block 17. The interior of the fixed block 17 is provided with a plurality of chute grooves 18. The chute grooves 18 are annular and evenly distributed inside the fixed block 17. The inner wall of the chute 18 is fixedly connected with a rubber block 19. The rubber block The other end of 19 is fixedly connected to a push plate 20, which is slidably connected to the inside of the slide groove 18. The slide groove 18 limits the push plate 20, so that the push plate 20 can slide smoothly. The other end of the push plate 20 is fixedly connected to a slide rod 21, which is slidably connected to the inside of the slide groove 18. The slide groove 18 limits the slide rod 21, so that the slide rod 21 will not deviate when moving. The end of the slide rod 21 away from the push plate 20 is fixedly connected to the cleaning brush 22.

[0051] When the special-shaped block 15 enters the interior of the connecting sleeve 2, the rubber block 19 is able to fit the special-shaped block 15 with the cleaning brush 22, and the cleaning brush 22 is able to move outward, and then the cleaning brush 22 is able to push the push plate 20 to move outward through the sliding rod 21, so that the push plate 20 is able to squeeze the rubber block 19 to produce deformation, and then the rubber block 19 is able to perform a reset movement, so that the rubber block 19 is able to push the push plate 20 to move in the opposite direction, and then the push plate 20 is able to push the sliding rod 21 to move inward, so that the sliding rod 21 is able to push the cleaning brush 22 to fit closely with the special-shaped block 15, and then the cleaning brush 22 is able to clean the special-shaped block 15, so that the special-shaped block 15 can be kept in a relatively tidy state when it is used next time.

[0052] Example 4: Based on Example 3, a construction method for reinforcing a shield-bored wall without reserved ground is proposed, comprising the following steps:

[0053] Step 1: Construct vertical MJS reinforcement before the first ground-connected wall;

[0054] Step 2: Construct horizontal MJS reinforcement under the main structure of the station;

[0055] Step 3: The shield machine passes through the vertical MJS reinforcement area;

[0056] Step 4: The shield machine grinds away the first ground-connected wall;

[0057] Step 5: The shield machine passes through the horizontal MJS reinforcement area;

[0058] Step 6: The shield machine grinds away the second ground-connected wall.

[0059] When using it, please note that when excavating slowly, pay attention to controlling the excavation speed and the amount of slag discharged to prevent over-excavation; when excavating slowly through a ground-connected wall, control the excavation speed and the pressure of the upper soil bin as the basis, and the cutter head torque and thrust can be adjusted according to the actual situation; pay attention to the slag discharge, observe whether the slag is steaming, whether there are concrete fragments, and whether the slag has a cement smell, to determine whether the cutter head cooling effect is sufficient.

[0060] In actual use, when the outer sleeve 26 is used for grouting, the micro motor 4 is started to operate, so that the micro motor 4 can drive the rotating shaft 5 to rotate, and then the rotating shaft 5 can drive the placement block 6 to rotate, so that the placement block 6 can move out from the placement groove 3, and when the slider 1 7 can follow the movement of the placement block 6, the inclined surface of the lower side of the slider 1 7 can slide on the slider 2 23, so that the slider 2 23 can be pushed downward by the slider 1 7, and then the slider 2 23 can push the push rod 10 to move downward. At this time, the limit block 9 can slide inside the limit groove 8, so that the push rod 10 can push the connecting block 12 to move downward, and then the connecting block 12 can push the special-shaped block 15 downward through the push rod 2 13, so that the special-shaped The block 15 is able to be separated from the inside of the connecting sleeve 2, and the connecting block 12 is able to squeeze the elastic member 14 to produce deformation. At this time, grouting is performed so that the upper surface of the grouting exceeds the bottom end height of the connecting sleeve 2 by 50 cm, so that the shape formed by the grouting is relatively rugged. On the contrary, by causing the micro motor 4 to rotate in the opposite direction, the micro motor 4 is able to drive the placement block 6 to enter the inside of the placement groove 3 through the rotating shaft 5, and drive the slider 1 7 to gradually move to a horizontal state, so that the limit block 9 is able to slide in the opposite direction inside the limit groove 8, so that the limit block 9 is able to pull the slider 2 23 to move upward, and the slider 2 23 is able to pull the connecting block 12 upward through the push rod 10. At this time, the elastic member 14 is able to perform a reset movement, so that the elastic member 14 is able to push the connecting block 12 to move upward, thereby enabling the connecting block 12 to smoothly pull the special-shaped block 15 to move upward, so that the special-shaped block 15 can enter the interior of the connecting sleeve 2, and the rubber block 19 is able to fit the special-shaped block 15 with the cleaning brush 22, and enable the cleaning brush 22 to move outward, thereby enabling the cleaning brush 22 to push the push plate 20 to move outward through the slide bar 21, thereby enabling the push plate 20 to squeeze the rubber block 19 to produce deformation, thereby enabling the rubber block 19 to perform a reset movement, thereby enabling the rubber block 19 to push the push plate 20 to move in the opposite direction, thereby enabling the push plate 20 to push the slide bar 21 to move inward, thereby enabling the slide bar 21 to push the cleaning brush 22 to fit closely with the special-shaped block 15, thereby enabling the cleaning The brush 22 can clean the special-shaped block 15 so that the special-shaped block 15 can be kept in a relatively neat state when it is used next time. At this time, the casing body 1 can be pulled back, and then when the second grouting is carried out, the above action is repeated, so that the upper surface of the second grouting can form a special-shaped reserved groove again, and the slurry can enter the relatively rugged reserved groove reserved for the first grouting, and the grouting is sprayed to the design elevation, and exceeds the grouting upper surface by 50 cm above the bottom end height of the connecting sleeve 2. At this time, the reserved groove left by the placement block 6 prevents the two piles from deviating up and down, and the reserved groove left by the special-shaped block 15 prevents the two piles from deviating left and right, thereby making the pile connection more stable, and cooperating with the vertical MJS reinforcement to curb the horizontal movement of the ground-connected wall.The horizontal MJS reinforcement technology was used to prevent the main structure of the station from sinking.

[0061] 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 construction accessory for reinforcing a shield-bored ground wall without a reserved ground wall, comprising a ground wall and an outer sleeve (26), wherein the outer sleeve (26) is placed directly above the ground wall, and is characterized in that: The outer sleeve (26) is composed of a plurality of sleeve bodies (1), wherein a threaded sleeve (24) is threadedly connected between the sleeve bodies (1) on the upper and lower sides, and the bottom end of the sleeve body (1) on the lower side is externally threadedly connected to a connecting sleeve (2), and the outside of the connecting sleeve (2) is provided with a plurality of placement grooves (3), the inside of the placement groove (3) is fixedly connected to a micro motor (4), and the output end of the micro motor (4) is fixedly connected to a rotating shaft (5), and the rotating shaft (5) is rotatably connected to the inside of the placement groove (3), and the outside of the rotating shaft (5) is fixedly connected to a placement block (6), and the outside of the placement block (6) is fixedly connected to the outside of the placement block (6). A plurality of protrusions are installed on the side, the placement block (6) is movably connected to the inside of the placement groove (3), the lower side of the inner wall of the placement groove (3) is fixedly connected to the installation block (11), the inside of the installation block (11) is provided with a connecting groove (25), the inside of the connecting groove (25) is slidably connected to the push rod 2 (13), the bottom end of the push rod 2 (13) is fixedly connected to the special-shaped block (15), the outside of the special-shaped block (15) is provided with a plurality of grooves, the special-shaped block (15) is slidably connected to the inside of the connecting sleeve (2), and the outside of the special-shaped block (15) is slidably connected to two sliding rod cleaning brushes (22).

2. The construction accessory for shield grinding to remove the reinforcement of the unreserved ground wall according to claim 1, characterized in that: The inner sides of the plurality of placement blocks (6) are all fixedly connected with a slider 1 (7), the lower side of the slider 1 (7) is an inclined surface, the slider 1 (7) is movably connected to the inside of the placement groove (3), the bottom end of the slider 1 (7) is provided with a limiting groove (8), the limiting groove (8) is designed to be inclined, the limiting groove (8) is internally slidably connected to the limiting block (9), the bottom end of the limiting block (9) is fixedly connected with a slider 2 (23), the upper side of the slider 2 (23) is an inclined surface, the inclined surface of the slider 2 (23) slides with the inclined surface of the slider 1 (7), the slider 2 (23) is slidably connected to the inside of the placement groove (3), the bottom end of the slider 2 (23) is fixedly connected with a push rod 1 (10), the bottom end of the push rod 1 (10) is fixedly connected with a connecting block (12), the connecting block (12) is fixedly connected to the top end of the push rod 2 (13), and the outer sleeve of the push rod 2 (13) is provided with an elastic member (14).

3. The construction accessory for shield grinding to reinforce unreserved ground walls according to claim 2, characterized in that: The lower inner side of the connecting sleeve (2) is provided with a plurality of mounting grooves (16), the inner part of the mounting groove (16) is fixedly connected with a fixed block (17), the inner part of the fixed block (17) is provided with a plurality of slide grooves (18), the inner wall of the slide groove (18) is fixedly connected with a rubber block (19), the other end of the rubber block (19) is fixedly connected with a push plate (20), the push plate (20) is slidably connected to the inner part of the slide groove (18), the other end of the push plate (20) is fixedly connected with a slide rod (21), the slide rod (21) is slidably connected to the inner part of the slide groove (18), and the end of the slide rod (21) away from the push plate (20) is fixedly connected to the cleaning brush (22).

4. The construction accessory for shield grinding to remove the reinforcement of the unreserved ground wall according to claim 3, characterized in that: One end of the elastic member (14) is fixedly connected to the inner wall of the connecting groove (25), the other end of the elastic member (14) is fixedly connected to the bottom end of the connecting block (12), the connecting block (12) is slidably connected to the inside of the connecting groove (25), and the push rod (10) is slidably connected to the inside of the connecting groove (25).

5. A construction method for reinforcing a shield-bored ground wall by grinding away a non-reserved ground wall, which uses the construction accessory for reinforcing a shield-bored ground wall by grinding away a non-reserved ground wall according to any one of claims 1 to 4, characterized in that: The method comprises the following steps: Step 1: Construct vertical MJS reinforcement before the first ground-connected wall; Step 2: Construct horizontal MJS reinforcement under the main structure of the station; Step 3: The shield machine passes through the vertical MJS reinforcement area; Step 4: The shield machine grinds away the first ground-connected wall; Step 5: The shield machine passes through the horizontal MJS reinforcement area; Step 6: The shield machine grinds away the second ground-connected wall.

6. A construction method for reinforcing a shield-bored wall by grinding away unreserved ground according to claim 5, characterized in that: The construction process of the vertical MJS reinforcement is as follows: according to the pile arrangement requirements of the design drawings and the benchmark control network, the reinforcement range is measured and the position points of each pile are positioned; in order to ensure the smooth drilling of the MJS jet grouting pile, the original road surface is broken to the original soil layer, and a trench is excavated to drain and store the return slurry to prevent drilling difficulties and mud overflow; according to the designed plane position and construction angle, the drilling rig is positioned and placed on the designed hole position; the hole is guided using a special guiding device, and the hole is drilled to the designed depth according to the positioned position and angle; after the drilling rig guides the hole, the outer casing (26) is lowered, the outer casing (26) is pulled back, and then the drill rod is lowered, and grouting is sprayed to the pulled-out outer casing (26), the outer casing (26) is pulled back again, and grouting is sprayed to the pulled-out outer casing (26) again, and then all the outer casings (26) are pulled out and grouting is sprayed to the designed elevation.

7. A construction method for reinforcing a shield-bored wall by grinding away unreserved ground according to claim 6, characterized in that: The construction process of the horizontal MJS reinforcement is as follows: first, the pile position is measured and placed, and the accuracy is ensured through off-hole control measurement and layout of the triangulation network. After acceptance, it is confirmed that the pile position error does not exceed 5mm. Then the equipment is installed and debugged, including leveling the working platform, digging drainage channels and checking the operation of the equipment to ensure safety and the hole position error is controlled within ±50mm. Then the hole is opened and the sealing device is buried to prevent sudden surge. After the power head is adjusted and fixed, the guide hole construction is carried out to penetrate the underground continuous wall and ensure that the drill rod is pulled back in time. The next steps include positioning the pile driver, preparing the slurry, pulling the rod and spraying, and sealing the hole and grouting to ensure the smooth progress of the construction and the realization of the final reinforcement effect.

8. The construction method for reinforcing a shield-bored wall by grinding away unreserved ground according to claim 5, characterized in that: The construction method of the shield machine passing through the ground-connected wall is as follows: The first step is to survey the subway station floor before shield tunnel construction, analyze the deformation of the tunnel structure, communicate with the operating unit to ensure safety, coordinate with the property rights and operating unit before shield tunneling, obtain the train schedule, and reasonably arrange the construction time. Before crossing, conduct core drilling inspection on the MJS reinforcement to ensure that the quality meets the standards. The inspection points should be no less than 1% of the piles and the strength should be no less than 1.0Mpa. The second step is to select the first 50 rings of the shield tunnel as the test section before construction to determine the optimal propulsion parameters and ground settlement rules. The test section tasks include collecting propulsion parameters, adjusting the shield posture, familiarizing with grouting operations, measuring the initial setting time of dual-liquid slurry, testing the filling effect, and monitoring the roadbed and track conditions. The goal is to determine the effective injection volume of mud, the optimal slag improvement parameters, and the excavation parameters to control surface settlement. The task of the crossing section is to strictly control the construction parameters to ensure that the roadbed and track settlement is controllable. The task of the post-crossing section is to take grouting measures based on the monitoring data to ensure the stability of the tunnel. The test results are used to predict the impact of the station on the construction and optimize the construction parameters. When the shield tunnel is crossing, it is necessary to debug the equipment, reasonably set the soil pressure, control the propulsion speed, synchronize the grouting, maintain the soil bin pressure, strengthen monitoring, and establish an on-site duty team to evaluate the monitoring data in a timely manner. Step 3: Shield tunneling through the crossing section: After grinding away the first diaphragm wall, the tunnel passes through the subway station floor, and then grinds away the second diaphragm wall; Step 4: Set the crossing parameters.

9. The construction method for reinforcing a shield-bored wall by grinding away unreserved ground according to claim 5, characterized in that: The tool configuration is arranged in five height steps: the first layer is the center cutter, with a height of 180mm. Its main function is to enter the soil in advance and stabilize its posture; the second layer is mainly composed of replaceable edge rollers, replaceable tearing cutters bolted on the front, and inner roller track welded tearing cutters, with a height of 140mm. Its main function is to cut reinforced concrete; the third layer is mainly composed of outer peripheral welded tearing cutters, with a height of 130mm and the same track as the roller. Its main function is to protect the roller and assist the roller in cutting concrete; the fourth layer is mainly composed of welded tearing cutters, with a height of 100mm. Its main function is to still have the ability to cut walls after the first three layers of cutters are worn; the fifth layer is a scraper, with a height of 80mm. Its main function is to collect debris into the soil bin.

10. A construction method for reinforcing a shield-bored wall by grinding away unreserved ground according to claim 8, characterized in that: The crossing parameter setting includes: In terms of soil pressure, when entering the reinforcement area, the soil pressure was consistent with that before the reinforcement area; when grinding the first wall, the upper soil pressure was 0.02MPa lower than that in the reinforcement area. After the wall grinding was completed, the soil pressure was adjusted according to the real-time monitoring of the station; In terms of excavation speed, after entering the MJS reinforcement area, the excavation speed is controlled at 30mm / min. When the cutterhead begins to grind the wall, the speed is controlled at 3mm / min, and a low-speed pump is used in slow mode to ensure that the cutter can effectively grind the ground wall concrete. Considering the outward extension of the ground wall, the speed needs to be reduced 20cm in advance. The relative position simulation is back-calculated using the incision mileage. In terms of thrust, the thrust ranges from 1200t to 1900t during the wall grinding stage. Specifically, when the cutter on one side of the shield machine contacts the ground wall and begins grinding, the thrust does not change significantly and remains stable in the range of 1300-1400t. When the center cutter enters, the thrust rises to the range of 1400-1900t, and gradually decreases after the center cutter exits the ground wall. In terms of torque, when the cutter on one side of the shield machine contacts the ground wall and begins to grind the wall, the torque increases relatively steadily and stabilizes in the range of 1500 to 3000 kN·m. When the center cutter enters, the torque begins to increase significantly. When the entire cutterhead panel is in the ground wall, the torque reaches a peak and remains in the range of 3000 to 4000 kN·m. When the cutter on one side exits the ground wall, the cutterhead torque begins to gradually decrease. Slag improvement: Use foam and bentonite to improve and cool the slag. The dilution ratio of the foam agent stock solution is 2%. Try not to use air for mixing and injection to avoid excessive fluctuations in soil pressure that may cause station settlement. The flow rate of the foam solution is adjusted according to the cutterhead torque, and the control range is about 120L / min. When using foam, it is used in conjunction with a mud pump and water. Slag sample analysis is carried out during the excavation process, and the improvement parameters are dynamically evaluated and adjusted. If the temperature is high, add ice cubes to the bentonite box to cool it down.

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