Construction accessory and construction method for shield grinding and removing of non-reserved underground diaphragm wall and reinforcement

Abstract

The invention relates to the technical field of ground-removing underground diaphragm wall reinforcing construction, in particular to a shield ground-removing non-reserved underground diaphragm wall and reinforcing construction accessory and construction method.The shield ground-removing non-reserved underground diaphragm wall reinforcing construction accessory comprises an underground diaphragm wall and an outer sleeve, and the outer sleeve is placed over the underground diaphragm wall; the outer sleeve is composed of a plurality of sleeve bodies, and a threaded sleeve is in threaded connection between the sleeve bodies on the upper side and the lower side. The method has the beneficial effects that the vertical MJS reinforcing technology and the horizontal MJS reinforcing technology are integrated, the vertical MJS reinforcing link focuses on restraining horizontal movement of the underground diaphragm wall, the horizontal MJS reinforcing link aims at preventing sinking of the station main body structure, construction operation is easy, convenient and practical, wide applicability is achieved, and the method is suitable for popularization and application. And the connecting sleeve provided with the special-shaped block is installed on the lower side of the outer sleeve, so that the multiple sections of vertical piles formed through grouting are connected more stably, the machining effect is higher, and powerful technical support is provided for high-quality development of urban rail transit.

Description

Technical Field

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

[0002] With the rapid development of urbanization, the rational use of underground space has become particularly important. In the gradual formation of the subway network, new subway tunnels may need to fully cross the existing subway tunnels or other underground structural facilities of the enclosure structure, such as the ground-connected wall. These ground-connected walls are usually used as enclosure structures to ensure the safety and stability of underground projects. Generally, glass fiber reinforcement bars are used for underground continuous wall reinforcements at the planned tunnel line, taking advantage of the material properties of glass fiber reinforcements such as high tensile strength, good corrosion resistance, low shear strength, and easy brittle fracture, so as to adapt to the smooth passage of subways and tunnel shield machinery.

[0003] During the construction process, the shield machine faces technical and safety challenges when crossing the ground-connected wall. On the one hand, the shield crossing may have an impact on the existing underground structure, such as causing ground settlement or structural deformation. On the other hand, the crossing construction of the ground-connected wall requires special technology (such as MJS method) and equipment (such as outer casing, drilling rig, installation of orifice sealing and spray-stopping devices, etc.) to ensure the smooth progress of the construction and the safety of the existing structure. Therefore, reinforcement before construction is particularly important, and during the shield crossing process, it is necessary to effectively manage possible risks, such as unstable strata, sudden water gushing, etc. Otherwise, it may cause damage to the ground-connected wall and surrounding structures, such as causing cracks or deformation, posing a threat to the safety of the existing structure.

[0004] At the same time, when the MJS method is used for reinforcement and the outer casing is used for multiple jet grouting, the upper surface of the reinforcement body formed by the grouting is generally a plane, and then the bottom surface of the next grouting, when it is not solidified, will be combined with the solidified upper surface of the previous grouting. 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, technical personnel in this field now propose a shield grinding without reserved ground connection wall and reinforcement construction accessories and construction methods to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a construction accessory and a construction method for shield grinding away unreserved ground connection walls and reinforcement, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a construction accessory for reinforcing a shield-milled unreserved ground-connected wall, comprising a ground-connected wall and an outer sleeve, wherein the outer sleeve is placed directly above the ground-connected wall, the outer sleeve is composed of a plurality of sleeve bodies, a threaded sleeve is threadedly connected between the sleeve bodies on the upper and lower sides, a connecting sleeve is threadedly connected to the bottom end of the sleeve body on the lower side, a plurality of placement grooves are provided on the outside of the connecting sleeve, a micro motor is fixedly connected to the inside of the placement groove, a rotating shaft is fixedly connected to the output end of the micro motor, the rotating shaft is rotatably connected to the inside of the placement groove, a placement block is fixedly connected to the outside of the rotating shaft, a plurality of protrusions are installed on the outside of the placement block, the placement block is movably connected to the inside of the placement groove, a mounting block is fixedly connected to the lower side of the inner wall of the placement groove, a connecting groove is provided inside the mounting block, a push rod 2 is slidably connected to the inside of the connecting groove, a special-shaped block is fixedly connected to the bottom end of the push rod 2, a plurality of grooves are provided on the outside of the special-shaped block, the special-shaped block is slidably connected to the inside of the connecting sleeve, and two cleaning brushes are 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 in design, the limiting slot is slidably connected to the inside of the limiting slot, 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 an elastic member is sleeved on the outside of the push rod 2.

[0008] Preferably, a plurality of mounting grooves are provided on the inner lower side of the connecting sleeve, a fixed block is fixedly connected to the interior 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, a push plate is fixedly connected to the other end of the rubber block, the push plate is slidably connected to the interior of the slide groove, a slide rod is fixedly connected to the other end of the push plate, the slide rod is slidably connected to the interior of the slide groove, and one 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-driven wall without reserved ground connection, the method comprising the following steps:

[0011] Step 1: construct vertical MJS reinforcement before the first ground-connected wall;

[0012] Step 2: construct horizontal MJS reinforcement under the main structure of the station;

[0013] Step 3: The shield machine passes through the vertical MJS reinforcement area;

[0014] Step 4: The shield machine grinds away the first ground-connected wall;

[0015] Step 5: The shield machine passes through the horizontal MJS reinforcement area;

[0016] Step 6: The shield machine grinds away the second ground-connected wall.

[0017] Preferably, the construction process of the vertical MJS reinforcement is as follows: the reinforcement range is measured according to the pile arrangement requirements of the design drawings and the benchmark control network, and the position points of each pile are positioned; to ensure the smooth drilling of the MJS rotary jet piles, the original road surface is broken to the original soil layer, and trenches are excavated to drain and store the return slurry to prevent drilling difficulties and mud overflow; the drilling rig is in place according to the designed plane position and construction angle, and the drilling rig is placed on the designed hole position; the hole is guided using a special hole guiding equipment, 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 is lowered, the outer casing is pulled back, and then the drill rod is lowered, and grouting is sprayed to the pulled-back outer casing, the outer casing is pulled back again, and grouting is sprayed to the pulled-back outer casing again, and then all the outer casings are pulled out, and grouting is sprayed to the designed elevation.

[0018] Preferably, the construction process of the horizontal MJS reinforcement is as follows: first, the pile position is measured and placed, and the accuracy is ensured by controlling the measurement outside the hole and laying out 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 control the hole position error within ±50mm. Subsequently, the sealing device is buried in the hole to prevent sudden surge. After the power head is adjusted and fixed, the hole is constructed 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 smooth construction and the realization of the final reinforcement effect.

[0019] Preferably, the construction method of the shield machine passing through the ground-connected wall is as follows:

[0020] Step 1: Before shield tunnel construction, it is necessary to survey the subway station floor, analyze the deformation of the tunnel structure, communicate with the operating unit to ensure safety, coordinate the property rights and operating unit before the shield tunnel passes through, obtain the train timetable, arrange the construction time reasonably, and conduct core drilling inspection on the MJS reinforcement before passing through to ensure that the quality meets the standards. The inspection points should be no less than 1% of the pile number and the strength should be no 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 the double-liquid slurry, testing the filling effect, and monitoring the roadbed and track conditions. The goal is to determine the effective injection amount of mud, the optimal slag improvement parameters, and the excavation parameters to control the 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 rear section of the crossing 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 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 in the crossing section: After grinding away the first ground-connecting wall, it passes through the subway station floor, and then grinds away the second ground-connecting 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, replaceable tearing knives bolted on the front, and inner circumference roller track welded tearing knives, with a knife height of 140mm, and the main function is to cut reinforced concrete; the third layer is mainly composed of outer circumference 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 is consistent with the excavation before the reinforcement area; when grinding the first wall, the upper soil pressure is 0.02MPa lower than that of the reinforcement area. After the wall grinding is completed, the soil pressure is 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 cutter disc starts to grind the wall, the speed is controlled at 3mm / min, and the low-speed pump is used in slow mode to ensure that the cutter can effectively grind the ground wall concrete. Considering that the ground wall is outward, it is necessary to reduce the speed 20cm in advance. The relative position simulation uses the incision mileage for back calculation;

[0028] In terms of thrust, the thrust is in the range of 1200t to 1900t during the wall grinding stage. Specifically, when the cutter on one side of the shield machine starts to grind the wall after contacting the ground wall, the thrust does not change significantly and is stable in the range of 1300 to 1400t. When the center cutter enters, the thrust rises to the range of 1400 to 1900t, and the thrust gradually decreases after the center cutter leaves 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 cutterhead panel is completely 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 leaves the ground wall, the torque of the cutterhead 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. During the excavation process, slag sample analysis is carried out, and the improvement parameters are dynamically evaluated and adjusted. If the temperature is high, add ice cubes to the bentonite box for cooling.

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

[0032] The present invention proposes a construction accessory and a 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 It is a process flow diagram of the construction method of the present invention;

[0034] Figure 2 It 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 It is a schematic diagram of the structure 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;

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

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

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

[0043] Fig.11 For the present invention Fig.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 make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail 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, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work 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-driven grinding-off wall without a reserved ground connection wall, comprising a ground connection wall and an outer sleeve 26, wherein the outer sleeve 26 is placed directly above the ground connection wall, and 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 a connecting sleeve 2 is threadedly connected to the bottom end of the lower sleeve body 1, wherein 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, and when it is necessary to increase the contact area of ​​the pile, the connecting sleeve 2 is installed at the bottom end of the lowermost sleeve body 1, thereby making the use more flexible, and 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, and a rotating shaft 5 is fixedly connected to the output end of the micro motor 4, and the rotating shaft 5 is rotatably connected to the inside of the placement groove 3, and the placement groove 3 limits the micro motor 4 so that the micro motor 4 can rotate smoothly, and a placement block 6 is fixedly connected to the outside of the rotating shaft 5, and a plurality of protrusions are installed on the outside of the placement block 6, and the protrusions 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 mounting block 11 is provided with a connecting groove 25. The inside of the connecting groove 25 is slidably connected to the push rod 13. The connecting groove 25 limits the push rod 13 so that the push rod 13 will not deviate when it slides. The bottom end is fixedly connected with a special-shaped block 15, and a plurality of grooves are provided on the outer side 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 with two cleaning brushes 22. The cleaning brushes 22 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] When grouting is being performed, 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 be moved out from the placement groove 3, and the push rod 13 is moved downward, so that the push rod 13 can push the special-shaped block 15 to move out from the inside of the connecting sleeve 2. 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, and then when the secondary grouting is performed, the slurry can 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 shifting up and down, and the reserved groove left by the special-shaped block 15 prevents the two piles from shifting left and right, so that the pile connection is more stable, 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 the special-shaped block 15, the inner sides of the multiple placement blocks 6 are fixedly connected with a slider 7, the lower side of the slider 7 is an inclined surface, the slider 7 is movably connected to the inside of the placement groove 3, and a limiting groove 8 is provided inside the bottom end of the slider 7. The limiting groove 8 is designed to be inclined, and the internal sliding connection of the limiting groove 8 is connected to the limiting block 9. 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 a slider 23, the limiting block 9 is used to connect the slider 23, the upper side of the slider 23 is an inclined surface, and the inclined surface of the slider 23 slides with the inclined surface of the slider 1 7, so that when the slider 1 7 rotates, the slider 1 7 can move the slider 23 downward. The slider 23 is slidably connected to the inside of the placement groove 3, and the placement groove 3 limits the slider 23, so that the slider 23 will not deviate when moving. The bottom end of the slider 23 is fixedly connected to the push rod 10, and the push rod 10 is slidably connected to the inside of the connecting groove 25. The bottom end of the push rod 10 is fixedly connected to the connecting block 12, and the connecting block 12 is slidably connected to the inside of the connecting groove 25. The connecting groove 25 limits the connecting block 12, so that the connecting block 12 will not deviate when moving. The connecting block 12 is fixedly connected to the top of the push rod 213, and the outer sleeve of the push rod 213 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 moves with the placement block 6, the inclined surface on 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 to move downward through the push rod 2 13, so that the special-shaped block 15 can be separated from the inside of the connecting sleeve 2, and at the same time, the connecting block 12 can 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 then the connecting block 12 can 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 sleeve body 1 can be pulled back at this time.

[0050] Embodiment 3: On the basis of embodiment 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 inner lower side of the connecting sleeve 2, and the mounting grooves 16 match the special-shaped block 15. A fixing block 17 is fixedly connected to the interior of the mounting grooves 16, and the mounting grooves 16 provide installation space for the fixing block 17. A plurality of slide grooves 18 are provided inside the fixing block 17, and the slide grooves 18 are annular and evenly distributed inside the fixing block 17. A rubber block 19 is fixedly connected to the inner wall of the slide groove 18, and the rubber block The other end of 19 is fixedly connected with 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 with 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, so that 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, so that 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, so that 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, so that 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] Embodiment 4: Based on Embodiment 3, a construction method for reinforcing a shield-driven wall without reserved ground connection 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 upper soil bin pressure as the basis, and the cutter head torque and thrust can be adjusted according to actual conditions; 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 placement block 6 to move, 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 1 10 to move downward. At this time, the limit block 9 can slide inside the limit groove 8, so that the push rod 1 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 separated from the inside of the connecting sleeve 2, and the connecting block 12 is squeezed by the elastic member 14 to deform. 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 can drive the placement block 6 to enter the inside of the placement groove 3 through the rotating shaft 5, and can drive the slider 1 7 to gradually move 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 23 can pull the connecting block 12 to move upward through the push rod 10. At this time, the elastic member 14 can perform a reset movement, so that the elastic member The rubber block 14 can push the connecting block 12 to move upward, so that the connecting block 12 can 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 can fit the special-shaped block 15 with the cleaning brush 22, and the cleaning brush 22 can move outward, so that the cleaning brush 22 can push the push plate 20 to move outward through the slide bar 21, so that the push plate 20 can squeeze the rubber block 19 to produce deformation, so that the rubber block 19 can perform a reset movement, so that the rubber block 19 can push the push plate 20 to move in the opposite direction, so that the push plate 20 can push the slide bar 21 to move inward, so that the slide bar 21 can push the cleaning brush 22 to fit closely with the special-shaped block 15, so that 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 the above action is repeated during the second grouting, 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 by the first grouting, and spray the grouting to the designed elevation, and exceed 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 shifting up and down, and the reserved groove left by the special-shaped block 15 prevents the two piles from shifting 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 station's main structure from sinking.

[0061] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A construction accessory for reinforcing a shield machine for grinding away a ground-connected wall without a reserved ground-connected wall, comprising a ground-connected wall and an outer sleeve (26), wherein the outer sleeve (26) is placed directly above the ground-connected 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 a connecting sleeve (2) is threadedly connected to the bottom end of the sleeve body (1) on the lower side, and a plurality of placement grooves (3) are provided on the outside of the connecting sleeve (2), wherein a micro motor (4) is fixedly connected to the inside of the placement groove (3), and a rotating shaft (5) is fixedly connected to the output end of the micro motor (4), wherein the rotating shaft (5) is rotatably connected to the inside of the placement groove (3), and a placement block (6) is fixedly connected to the outside of the rotation shaft (5), and the outside of the placement block (6) is 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), a connecting groove (25) is provided inside the installation block (11), a push rod 2 (13) is slidably connected inside the connecting groove (25), the bottom end of the push rod 2 (13) is fixedly connected to a special-shaped block (15), a plurality of grooves are provided on the outside of the special-shaped block (15), the special-shaped block (15) is slidably connected to the inside of the connecting sleeve (2), and two sliding rod cleaning brushes (22) are slidably connected to the outside of the special-shaped block (15).

2. The construction accessory for reinforcing a shield machine by grinding away a wall without reserved ground connection according to claim 7, characterized in that: The inner sides of the plurality of placement blocks (6) are all fixedly connected with a slider (7), the lower side of the slider (7) is an inclined surface, the slider (7) is movably connected inside the placement slot (3), a limiting slot (8) is provided inside the bottom end of the slider (7), the limiting slot (8) is of inclined design, the limiting slot (8) is internally slidably connected with a limiting block (9), the bottom end of the limiting block (9) is fixedly connected with a slider (23), the slider (23) is ) has an inclined surface on its upper side, 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 inside the placement groove (3), the bottom end of the slider 2 (23) is fixedly connected to the push rod 1 (10), the bottom end of the push rod 1 (10) is fixedly connected to the 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 reinforcing a shield machine by grinding away a wall without reserved ground connection according to claim 7, characterized in that: A plurality of mounting grooves (16) are provided on the lower inner side of the connecting sleeve (2), a fixed block (17) is fixedly connected to the inner side of the mounting groove (16), a plurality of slide grooves (18) are provided inside the fixed block (17), a rubber block (19) is fixedly connected to the inner wall of the slide groove (18), a push plate (20) is fixedly connected to the other end of the rubber block (19), the push plate (20) is slidably connected to the inner side of the slide groove (18), a slide rod (21) is fixedly connected to the other end of the push plate (20), the slide rod (21) is slidably connected to the inner side 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. A construction accessory for reinforcing a shield machine by grinding away a wall without reserved ground connection according to claim 8, 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 1 (10) is slidably connected to the inside of the connecting groove (25).

5. A construction method for reinforcing a shield-driven grinding wall without reserved ground connection 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-driven wall without reserved 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; the drilling rig is positioned according to the designed plane position and construction angle, and the drilling rig is placed on the designed hole position; the hole is guided using a special hole guiding device, and the hole is guided 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 back outer casing (26), the outer casing (26) is pulled back again, and grouting is sprayed to the pulled back 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-driven wall without reserved 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 by controlling the measurement outside the hole and laying out 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 control the hole position error within ±50mm. Subsequently, the sealing device is buried in the hole to prevent sudden surge. After the power head is adjusted and fixed, the lead 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-driven wall without reserved ground is described in claim 5, characterized in that: The construction method of the shield machine passing through the ground-connected wall is as follows: Step 1: Before shield tunnel construction, it is necessary to survey the subway station floor, analyze the deformation of the tunnel structure, communicate with the operating unit to ensure safety, coordinate the property rights and operating unit before the shield tunnel passes through, obtain the train timetable, arrange the construction time reasonably, and conduct core drilling inspection on the MJS reinforcement before passing through to ensure that the quality meets the standards. The inspection points should be no less than 1% of the pile number 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 the double-liquid slurry, testing the filling effect, and monitoring the roadbed and track conditions. The goal is to determine the effective injection amount of mud, the optimal slag improvement parameters, and the excavation parameters to control the 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 rear section of the crossing 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 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 in the crossing section: After grinding away the first ground-connecting wall, it passes through the subway station floor, and then grinds away the second ground-connecting wall; Step 4: Set the crossing parameters.

9. A construction method for reinforcing a shield-driven wall without reserved ground according to claim 5, characterized in that: The tool configuration is divided into five height steps: the first layer is the center knife, with a knife 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 knives bolted on the front, and inner roller track welded tearing knives, with a knife height of 140mm. The 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. The 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. The 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. The main function is to collect the debris into the soil bin.

10. A construction method for reinforcing a shield-driven wall without reserved 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 is consistent with the excavation before the reinforcement area; when grinding the first wall, the upper soil pressure is 0.02MPa lower than that of the reinforcement area. After the wall grinding is completed, the soil pressure is 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 cutter disc starts to grind the wall, the speed is controlled at 3mm / min, and the low-speed pump is used in slow mode to ensure that the cutter can effectively grind the ground wall concrete. Considering that the ground wall is outward, it is necessary to reduce the speed 20cm in advance. The relative position simulation uses the incision mileage for back calculation; In terms of thrust, the thrust is in the range of 1200t to 1900t during the wall grinding stage. Specifically, when the cutter on one side of the shield machine starts to grind the wall after contacting the ground wall, the thrust does not change significantly and is stable in the range of 1300 to 1400t. When the center cutter enters, the thrust rises to the range of 1400 to 1900t, and the thrust gradually decreases after the center cutter leaves 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 cutterhead panel is completely 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 leaves the ground wall, the torque of the cutterhead 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 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. During the excavation process, slag sample analysis is carried out, and the improvement parameters are dynamically evaluated and adjusted. If the temperature is high, add ice cubes to the bentonite box for cooling.

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