Prefabricated underground diaphragm wall vertical seam horizontal connecting structure and construction method thereof

Abstract

The invention discloses a prefabricated horizontal connecting structure for a vertical seam of an underground diaphragm wall and a construction method of the prefabricated horizontal connecting structure. The prefabricated horizontal connecting structure comprises a steel pipe, a sealing ring, a spring ring, a clamping groove device and a grouting pipe. The head of the steel pipe is welded with a hexagon bolt connected with the clamping groove device, and the tail of the steel pipe is fixed in the convex wall; the steel pipe is provided with a sealing ring and a spring ring which are respectively positioned at 1 / 3 of the tail end and 1 / 6 of the front end of the steel pipe to form a concentric ring; the elastic force of the spring ring drives the clamping groove device to open and close, and the clamping groove device can rotate around the shaft and is clamped into the reserved notch in the groove to prevent falling. The prefabricated underground diaphragm wall is high in operability, the overall rigidity of the prefabricated underground diaphragm wall can be improved, the structural stability is enhanced, the prefabricated underground diaphragm wall has certain deformation capacity, the deformation requirement of the prefabricated underground diaphragm wall body can be met, meanwhile, deformation is controlled within a reasonable range through a force transmission mechanism at the joint, and safety and stability of a deep foundation pit are guaranteed.

Description

Technical Field

[0001] This project involves strengthening the bearing capacity and overall performance of the joints of prefabricated ground-connected walls in the underground retaining structure of deep foundation pit projects. More specifically, it involves a prefabricated assembled ground-connected wall vertical seam horizontal connection structure and its construction method. Background Art

[0002] With the increasing development and utilization of underground space, the scale of foundation pit projects has continued to rise, showing a significant trend of "large-scale and deep", especially super-large-scale foundation pit group projects are common. Although this development trend has promoted urban construction, it has also brought many challenges. When carrying out foundation pit construction in densely populated urban areas, facing the complex and changing surrounding environment, more stringent requirements are put forward for the foundation pit support system: it is necessary to ensure the structural safety and economic efficiency of the foundation pit itself, maintain the stability of the surrounding environment, and pursue energy conservation, emission reduction and sustainable development goals.

[0003] At present, the traditional methods commonly used in the field of foundation pit support in my country, such as bored cast-in-place piles and underground continuous wall technology, have met the engineering needs to a certain extent, but have exposed many drawbacks: the construction process is inefficient, the working environment is harsh, and quality control is difficult; the large amount of mud discharge generated during the construction process not only increases the environmental burden, but also consumes a lot of energy and resources.

[0004] As an efficient underground structure construction method, prefabricated ground-connected walls have the advantages of fast construction speed, controllable quality, and low environmental impact. In the connection process of prefabricated ground-connected walls, the key is to ensure that the connection between the prefabricated walls is firm and sealed to meet the integrity and waterproof requirements of the structure. Studies have found that reasonable structural layout and size design at the joints can ensure that the connection parts of the prefabricated ground-connected walls can transfer loads evenly and remain stable when subjected to external forces, which is crucial to the construction quality of prefabricated underground continuous walls and the safety of foundation pits. Reinforced joints are a reasonable and feasible option that can enhance the bearing capacity of the connection parts and improve the bearing performance and stability of prefabricated ground-connected walls.

[0005] However, due to the limitations of site conditions such as small space, insufficient light, and poor ventilation, the construction of accurate docking of prefabricated ground-connected walls needs to be fully considered. When assembling prefabricated ground-connected walls, the concave end of the ground-connected wall is docked with the convex end, and grouting is injected at the joints on both sides. It can effectively transmit the internal forces of the left and right ground-connected walls, while increasing the bearing capacity of the horizontal joints of the ground-connected walls, filling the tiny gaps at the joints, improving the water-stopping effect of the joints, and ensuring the overall waterproof performance of the underground continuous wall. The docking of the concave and convex ends of the prefabricated ground-connected walls requires a high degree of construction precision, which affects the efficiency of the splicing construction.

[0006] Therefore, it is necessary to design a reinforced prefabricated ground-connected wall connection construction method that can achieve precise docking of prefabricated ground-connected walls, facilitate construction, and effectively transmit force, so as to solve the above technical problems. Summary of the invention

[0007] The purpose of the present invention is to provide a prefabricated assembled ground-connected wall vertical seam horizontal connection structure and a construction method thereof, so as to solve the limitations of the prefabricated ground-connected wall connection parts such as weak connection parts and water seepage described in the above background technology, while strengthening the prefabricated ground-connected wall connection and reducing water seepage at the joints, it can also further improve the splicing construction efficiency.

[0008] To achieve the above-mentioned object, the present invention provides the following technical solutions: a prefabricated assembled ground-connected wall vertical seam horizontal connection structure, comprising a prefabricated convex wall, a prefabricated concave wall and a reinforced connection device, wherein the prefabricated convex wall and the prefabricated concave wall are horizontally butted against each other through the reinforced connection device;

[0009] The strengthening connection device comprises a steel pipe, a sealing ring, a spring ring, a slot device, and a grouting pipe;

[0010] The steel pipe is the main body of the strengthening connection device. The tail of the steel pipe is fixed in the prefabricated convex wall. The head of the steel pipe is welded with a hexagonal bolt. The hexagonal bolt is connected to the slot device through a rotating shaft. The bolt plays a key role in positioning and aligning when the strengthening connection device extends into the prefabricated concave wall, ensuring that the prefabricated concave wall and the prefabricated convex wall can achieve accurate matching; a cylindrical-hexagonal prism combination groove is provided in the prefabricated concave wall, and the head of the steel pipe extends into the cylindrical-hexagonal prism combination groove;

[0011] The sealing ring is located 1 / 3 of the length of the steel pipe from the end of the steel pipe, installed on the outer surface of the steel pipe, and forms a concentric ring with the steel pipe. It is a rubber ring with a spring. It is mainly used to provide additional sealing effect on the connection after the grouting is completed between the prefabricated concave wall and the prefabricated convex wall, to ensure the integrity and safety of the splicing of the prefabricated ground-connected wall. At the same time, the sealing ring can also play a certain buffering and protective role, reduce damage to the connection parts due to vibration, impact and other factors, and extend the service life of the reinforced connection device.

[0012] The spring ring is located at 1 / 6 of the pipe length from the head end of the steel pipe, installed on the outer surface of the steel pipe, and forms a concentric ring with the steel pipe. It is a rubber ring with a spring. The elastic force of the spring can drive the slot device circumscribed to the spring ring to open and close. The main function of the spring ring is to assist the slot device to open smoothly after entering the slot when the strengthening connection device extends into the reserved slot of the prefabricated concave wall, and to help the slot device accurately snap into the preset notch in the slot through its thrust, so as to ensure that the prefabricated concave wall and the prefabricated convex wall can be stably and firmly installed in place.

[0013] The clamping slot device is located inside the strengthening connection device, connected to the hexagonal bolt at the end of the steel pipe through a rotating shaft, and can rotate around the shaft. At the same time, the middle part of the clamping slot device is circumscribed to the spring coil, and the clamping function is realized under the elastic force of the spring coil: in the initial stage when the strengthening connection device extends into the prefabricated concave wall, due to the annular constraint of the notch of the cylindrical-hexagonal prism combination groove, the spring coil will be compressed and drive the clamping slot device to tighten. When the clamping slot device and the spring coil pass through the notch of the cylindrical-hexagonal prism combination groove, the annular constraint is released, and the spring coil will restore the elastic force to push the clamping slot device to clamp at the notch;

[0014] The grouting pipe is arranged along the inner wall of the steel pipe and extends into the cylinder-hexagonal prism combination groove of the prefabricated concave wall. After the slot device is clamped in the cylinder-hexagonal prism combination groove, cement mortar is injected into the interlayer between the slot device, the groove wall of the cylinder-hexagonal prism combination groove, the sealing ring, and the spring ring through the grouting pipe to reinforce this part of the space, so as to further improve the overall stiffness of the prefabricated ground-connected wall connection.

[0015] Preferably, the diameter of the steel pipe is 34-60mm, which is suitable for walls with a thickness of 800-1500mm in actual projects. Three rows of keys can be used according to actual conditions, with double or triple keys in each row. The distance between the steel pipe and the edge of the wall is not less than 50mm to ensure positioning and anti-deviating effects. The length L1 of the anchoring section of the steel pipe extending into the prefabricated concave wall is not less than 40d1, where d1 is the diameter of the steel pipe. The tail end of the steel pipe is embedded in the prefabricated convex wall, and the embedding depth L2 needs to be greater than 40d1, where d1 is the diameter of the steel pipe. A certain length of the anchoring section can ensure that there is sufficient contact area and friction between the joint and the concrete, thereby effectively resisting external loads and increasing the bearing capacity of the prefabricated ground-connected wall.

[0016] Preferably, the bolt diameter (M20-M42) selected for the hexagonal bolt should be slightly smaller than or equal to the actual outer diameter of the steel pipe to ensure that the bolt can circumscribe the steel pipe and fit tightly. Stainless steel or carbon steel bolts such as grade 4.8 and grade 8.8 can be selected to meet the requirements of the working environment and corrosion resistance.

[0017] Preferably, the slot device is composed of six steel plate coils with a thickness of 5-10mm. The six steel plate coils are respectively combined on the rotating shaft of the hexagonal bolt, and the slot device composed of the six steel plate coils is circumscribed on the spring coil. The test ensures that the steel plate coil can rotate around the hexagonal bolt at the end of the steel pipe and realize the opening and closing function under the elastic force of the spring coil; its opening and closing structure makes it difficult for the joint to loosen and fall off due to vibration or external force after clamping, thereby improving the integrity of the prefabricated ground wall connection; there are also reserved holes on the steel plate coil to facilitate the inflow of slurry during the later grouting, further providing protection for the anti-seepage of the prefabricated ground wall connection.

[0018] Preferably, the grouting pipe is a steel round pipe with a conical tip at the bottom for easy insertion into the soil. The diameter of the grouting pipe is 20-50mm. Two rows of symmetrical round holes are opened in the lower 1 / 3 of the grouting pipe. The diameter of the round holes is 5-8mm and the spacing is 15cm to achieve the effect of sufficient grouting reinforcement of the connection. The round holes are sealed with tape before grouting to prevent blockage. The strength of the grouting material for the grouting pipe is C50.

[0019] The steel pipe of the present invention is interconnected with the spring ring and the slot device to form an expandable and closable mechanism, which extends together into the groove reserved in the concave wall of the prefabricated underground continuous wall. In the process of the reinforced connection device initially entering the concave wall, due to the annular restriction imposed by the notch, the spring ring will be subjected to pressure and compression, and the slot device will deform, close and close together with the spring ring under the action of the annular pressure. Once the slot device and the spring ring successfully pass through the notch, the annular restriction disappears, and the spring ring releases its elastic force, pushing the slot device to open and firmly clamp at the notch reserved in the concave wall to ensure the tightness of the connection between the concave wall and the convex wall.

[0020] The sealing ring and spring ring of the present invention not only assist in installation and provide sealing, but also promote zoning control during the grouting process. The spring ring is located at 1 / 6 of the pipe length at the front end of the steel pipe, and can serve as a preliminary barrier to the flow of slurry during grouting, guiding the slurry to enter the first reinforcement area along a predetermined path. The sealing ring is located at 1 / 3 of the pipe length from the rear end of the steel pipe, serving as the starting point of the second grouting area and the end point of the previous area, and can effectively isolate different reinforcement areas to prevent the slurry from mixing with each other. The coordinated use of sealing rings and spring rings to achieve zoned grouting not only provides additional sealing effects, but also enhances the stability and bearing capacity of the overall structure. In areas with complex geological conditions or uneven settlement, the grouting amount and pressure can be adjusted according to actual conditions to ensure that the grouting effect is optimal.

[0021] The construction method of the present invention for strengthening the prefabricated ground-wall connection joint by using the strengthening connection device comprises:

[0022] Step S1: Strengthen the production of the connection device. According to the actual wall thickness (800-1500mm), a steel pipe with a nominal diameter of 34-60mm is selected to ensure that the material and strength of the steel pipe meet the engineering requirements; the length of the steel pipe should be customized according to the actual wall thickness (800-1500mm) to ensure that the subsequent steel pipe extends into the prefabricated concave wall anchoring section L1 is not less than 40d1 (d1: steel pipe diameter), and its tail can be fixed in the prefabricated convex wall; a hexagonal bolt is welded on the head of the steel pipe, and the selected bolt diameter (M20-M42) should be slightly smaller than or equal to the actual outer diameter of the steel pipe to ensure that the bolt can be externally cut on the steel pipe and fit tightly. Stainless steel or carbon steel bolts such as 4.8 and 8.8 can be selected to meet the requirements of the working environment and corrosion resistance. The six sides of the hexagonal bolt are welded with a rotating shaft so that the slot device can rotate around the shaft; a rubber ring with a spring is prepared as a sealing ring to ensure that its inner diameter size is consistent with the steel pipe. The outer diameter of the steel pipe is matched, and it is fixed at 1 / 3 of the length of the steel pipe tail end to form a concentric ring with the steel pipe and provide additional sealing effect; prepare a rubber ring with a spring as a spring ring, ensure that its inner diameter matches the outer diameter of the steel pipe, and fix it at 1 / 6 of the length of the steel pipe front end to form a concentric ring with the steel pipe, and ensure that the size and elasticity of the spring ring and the sealing ring meet the design requirements; select a steel plate with a thickness of 5-10mm to roll into a slot device, which consists of six steel plate rolls, and the six steel plate rolls are respectively combined on the rotating shaft of the hexagonal bolt, and the slot device composed of the six steel plate rolls is circumscribed to the spring ring. Tests ensure that the steel plate roll can rotate around the hexagonal bolt at the end of the steel pipe and realize the opening and closing function under the elastic force of the spring ring; arrange a steel grouting pipe along the inner wall of the steel pipe, with a diameter between 20-50mm and a length that matches the steel pipe, and a conical tip at the bottom to facilitate driving into the soil;

[0023] Step S2: Production of prefabricated concave wall, firstly, produce the steel cage of the prefabricated concave wall, support the formwork and pay attention to leaving a space at the reserved concrete groove, the space is the cylinder-hexagonal prism combination groove, one end of the cylinder of the cylinder-hexagonal prism combination groove is connected to a bottom surface of the hexagonal prism, the entrance of the prefabricated concave wall groove is the top surface of the cylinder, and its diameter needs to be reserved 10mm more than the steel pipe diameter d1, the diameter of the hexagonal prism bottom surface circumscribed circle of the cylinder-hexagonal prism combination groove needs to be reserved 15mm more than the steel pipe diameter d1, the height of the cylinder of the cylinder-hexagonal prism combination groove is: L1-(2 / 3)*steel pipe length, so as to ensure that the reinforcing connection device is smoothly inserted into the groove, pour concrete and maintain according to the design requirements, and complete the production of the prefabricated concave wall;

[0024] Step S3: Production of prefabricated convex wall, the actual wall thickness is 800-1500mm, firstly, the prefabricated convex wall steel cage is produced, and then the transverse steel bars are welded to the corresponding position of the steel cage according to the design drawing requirements; nine connection keys are evenly arranged in three rows and three columns on the butt wall to prevent the connection between the prefabricated ground connection walls from being separated, and the connection key of the prefabricated convex wall close to the wall side needs to be 50mm away from the wall edge; the tail of the steel pipe of the strengthening connection device is fixed in the prefabricated convex wall, and the length L2 of the embedded section in the prefabricated convex wall is not less than 40d1, d1 is the diameter of the steel pipe, and a certain length of anchor section can be To ensure that there is enough contact area and friction between the joint and the concrete, so as to effectively resist external loads and increase the bearing capacity of the prefabricated ground-connected wall; secondly, the grouting pipe embedded in the steel pipe extends upward from the tail of the steel pipe to ensure that the grouting pipe extends from the top of the prefabricated convex wall, which is convenient for the subsequent grouting work after the splicing is completed; finally, the beard reinforcement is tied at the tail of the steel pipe to connect it with the prefabricated convex wall, so that the joint is not easy to fall out of the prefabricated convex wall; after the pouring is completed, maintenance work is carried out to ensure that the concrete meets the strength and other performance indicators required by the design, and the production of the prefabricated convex wall is completed;

[0025] Step S4: Ground treatment and measurement to ensure that the foundation is flat and solid, and mark the wall position; use lifting equipment to lift the first prefabricated wall to the designated position and adjust it to a vertical level; install the second wall in the same way, push it to dock after precise alignment, and ensure that the redundant steel bars enter the groove of the cylinder-hexagonal column combination, and the concave and convex wall axes coincide;

[0026] Step S5: When the end of the reinforced connection device of the prefabricated convex wall enters the cylinder-hexagonal prism combination groove reserved in the prefabricated concave wall, it will first pass through the cylindrical groove. At this time, the clamping groove device and the spring ring are firstly subject to the annular constraint of the cylindrical groove, shrink and close inward to pass through the cylindrical groove, and after entering the hexagonal groove, the clamping groove device opens outward under the elastic force of the spring ring, clamps the groove wall, and when the sealing ring is compressed through the cylindrical groove and enters the hexagonal groove and cannot move forward, the prefabricated concave wall and the prefabricated convex wall are preliminarily connected;

[0027] Step S6: Pull the prefabricated convex wall outward horizontally to ensure that the slot device clamps the prefabricated concave wall slot wall, and check whether the sealing ring is out of place. If it is not out of place, it means that the slot has been sealed, and the mechanical installation inside and outside the wall is completed; if the sealing ring does not enter the hexagonal prism slot or is out of place, repeat step S5 for secondary installation;

[0028] Step S7: Grouting reinforcement is performed inside the gaps of the prefabricated concave wall and the prefabricated convex wall through the reserved grouting pipe.

[0029] Beneficial effects: Compared with the prior art, the technical advantages of the present invention are:

[0030] The present invention provides a technology and construction method for horizontal connection of vertical seams of prefabricated assembled ground-connected walls, which realizes efficient connection and excellent sealing performance through the combined design of a slot device and a spring ring, and the use of a sealing ring. The slot device can realize the opening and closing function under the elastic force of the spring ring, and smoothly enter and clamp the hexagonal prism-shaped slot wall of the prefabricated concave wall. The sealing ring ensures the sealing of the connection, prevents the leakage of slurry during the grouting process, realizes the precise positioning of the splicing, and solves the problem of weakening of the connection of the previous prefabricated ground-connected walls, and improves the overall stiffness of the underground continuous wall; finally, the grouting process is adopted, and the spring ring and the sealing ring can realize the partitioned reinforcement of the grouting in the groove, and the sealing ring can prevent the slurry from seeping out of the groove, optimizing the connection effect and the water-stopping effect of the joint. The method also optimizes the construction steps and improves the construction efficiency. Through a series of steps such as foundation treatment, wall hoisting, docking adjustment, clamping of the slot device, sealing ring inspection and grouting reinforcement, the prefabricated ground-connected wall is connected quickly and accurately. Compared with the traditional connection method, the method not only shortens the construction period, but also reduces the subsequent maintenance cost. In addition, while enhancing the overall stiffness and bearing capacity of the prefabricated ground-connected wall connection, the materials used in the present invention meet environmental protection requirements, reduce environmental pollution during the construction process, and the efficient construction method reduces energy consumption, which is in line with the concept of sustainable development. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a bird's-eye view of the wall splicing of the present invention.

[0032] Figure 2 It is a top view of the joint of the present invention before docking.

[0033] Figure 3 It is a top view of the joint of the present invention after docking.

[0034] Figure 4 It is a schematic diagram of a single reserved groove after the prefabricated concave wall of the present invention is completed.

[0035] Figure 5 Schematic diagram of a steel pipe of a single reinforced connection device of the present invention.

[0036] Figure 6 This is a schematic diagram of the positional relationship between the sealing ring, the spring ring and the steel pipe after the prefabricated convex wall of the present invention is installed.

[0037] Figure 7 It is a large-scale drawing of the card slot device of the present invention.

[0038] Figure 8 It is a schematic diagram of the position relationship between the grouting pipe and the steel pipe after the prefabricated convex wall of the present invention is installed. DETAILED DESCRIPTION

[0039] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] See also Figure 1-8 A prefabricated assembled ground-connected wall vertical seam horizontal connection structure, comprising a prefabricated convex wall 6, a prefabricated concave wall 7 and a strengthening connection device, wherein the prefabricated convex wall 6 and the prefabricated concave wall 7 are horizontally butted against each other through the strengthening connection device; the strengthening connection device comprises a steel pipe 1, a sealing ring 2, a spring ring 3, a slot device 4, and a grouting pipe 5;

[0041] The steel pipe 1 is the main body of the strengthening connection device. The tail of the steel pipe 1 is fixed in the prefabricated convex wall 6. The head of the steel pipe 1 is welded with a hexagonal bolt 9. The hexagonal bolt 9 is connected to the slot device 4 through a rotating shaft 10. The bolt plays a key role in positioning and aligning when the strengthening connection device extends into the prefabricated concave wall, ensuring that the prefabricated concave wall and the prefabricated convex wall can be accurately matched; a cylindrical-hexagonal prism combination groove is provided in the prefabricated concave wall 7, and the head of the steel pipe 1 extends into the cylindrical-hexagonal prism combination groove; the diameter of the steel pipe 1 is 34-60mm, which is suitable for 800-1500mm thick in actual engineering. The wall can adopt three rows of keys according to the actual situation, with double or triple keys in each row. The distance between the steel pipe 1 and the edge of the wall is not less than 50mm to ensure the positioning and anti-deviating effect; the length L1 of the anchoring section of the steel pipe 1 extending into the prefabricated concave wall 7 is not less than 40d1, d1 is the diameter of the steel pipe, and the tail end of the steel pipe 1 is embedded in the prefabricated convex wall, and the embedding depth L2 needs to be greater than 40d1, d1 is the diameter of the steel pipe. A certain length of anchoring section can ensure that there is enough contact area and friction between the joint and the concrete, so as to effectively resist external loads and increase the bearing capacity of the prefabricated ground-connected wall. The bolt diameter (M20-M42) selected for the hexagonal bolt 9 should be slightly less than or equal to the actual outer diameter of the steel pipe 1 to ensure that the bolt can be externally cut into the steel pipe and fit tightly. Stainless steel or carbon steel bolts such as 4.8 and 8.8 can be selected to meet the requirements of the working environment and corrosion resistance.

[0042] The sealing ring 2 is located 1 / 3 of the length of the steel pipe 1 from the tail end, installed on the outer surface of the steel pipe 1, and forms a concentric ring with the steel pipe 1. It is a rubber ring with a spring. It is mainly used to provide additional sealing effect on the connection after the grouting is completed between the prefabricated concave wall and the prefabricated convex wall, to ensure the integrity and safety of the splicing of the prefabricated ground-connected wall. At the same time, the sealing ring can also play a certain buffering and protective role, reduce the damage to the connection parts due to vibration, impact and other factors, and extend the service life of the strengthening connection device.

[0043] The spring ring 3 is located at 1 / 6 of the pipe length from the head end of the steel pipe 1, installed on the outer surface of the steel pipe 1, and forms a concentric ring with the steel pipe 1. It is a rubber ring with a spring. The elastic force of the spring can drive the slot device 4 circumscribed to the spring ring 3 to open and close; the main function of the spring ring 3 is to assist the slot device 4 to open smoothly after entering the slot when the strengthening connection device extends into the reserved slot of the prefabricated concave wall, and to help the slot device accurately snap into the preset notch in the slot through its thrust, so as to ensure that the prefabricated concave wall and the prefabricated convex wall can be stably and firmly installed in place;

[0044] The slot device 4 is located inside the strengthening connection device, and is connected to the hexagonal bolt 9 at the end of the steel pipe 1 through the rotating shaft 10, and can rotate around the shaft. At the same time, the middle part of the slot device 4 is circumscribed to the spring coil 3, and the clamping function is realized under the elastic force of the spring coil 3: in the initial stage when the strengthening connection device extends into the prefabricated concave wall 7, due to the annular constraint of the notch of the cylindrical-hexagonal prism combination groove, the spring coil 3 will be compressed and drive the slot device 4 to tighten. When the slot device 4 and the spring coil 3 pass through the notch of the cylindrical-hexagonal prism combination groove, the annular constraint is released, and the spring coil 3 will restore the elastic force to push the slot device 4 to clamp at the notch; the clamping The slot device 4 is composed of six steel plate coils, which are made of steel plate coils with a thickness of 5-10mm. The six steel plate coils are respectively combined on the rotating shaft 10 of the hexagonal bolt 9, and the slot devices composed of the six steel plate coils are all circumscribed on the spring coil. The test ensures that the steel plate coil can rotate around the hexagonal bolt 9 at the end of the steel pipe 1, and realize the opening and closing function under the elastic force of the spring coil 3; its opening and closing structure makes it difficult for the joint to loosen and fall off due to vibration or external force after clamping, thereby improving the integrity of the prefabricated ground-connected wall connection; there are also reserved holes on the steel plate coil to facilitate the inflow of slurry during the later grouting, further providing protection for the anti-seepage of the prefabricated ground-connected wall connection.

[0045] The grouting pipe 5 is arranged along the inner wall of the steel pipe 1 and extends into the cylinder-hexagonal prism combination groove of the prefabricated concave wall 7. After the slot device 4 is clamped in the cylinder-hexagonal prism combination groove, cement mortar is injected into the interlayer between the slot device 4, the groove wall of the cylinder-hexagonal prism combination groove, the sealing ring 2, and the spring ring 3 through the grouting pipe 5 to reinforce this part of the space, so as to further improve the overall rigidity of the prefabricated ground-connected wall connection. The grouting pipe 5 is a steel round pipe, and the bottom end is a conical tip for easy insertion into the soil. The diameter of the grouting pipe 5 is 20-50mm. Two rows of symmetrical eye holes are opened in the lower 1 / 3 of the grouting pipe 5. The diameter of the eye holes is 5-8mm and the spacing is 15cm, so as to achieve the effect of sufficient grouting reinforcement of the connection. The eye holes are sealed with tape before grouting to prevent blockage. The strength of the grouting material of the grouting pipe 5 is C50.

[0046] The present invention realizes precise positioning of splicing; the mechanism of the spring ring 3 driving the slot device 4 to open and close can significantly solve the weak problem of the prefabricated underground continuous wall connection, thereby improving the overall stiffness of the underground continuous wall; a grouting pipe 5 is reserved in the convex wall, and a grouting process can be used after the concave wall and the convex wall are spliced, which can effectively prevent water seepage and optimize the connection effect; the sealing ring 2 and the spring ring 3 work together to realize the partition reinforcement of the grouting in the groove, and the sealing ring 2 also plays an additional role in preventing the slurry from leaking out of the groove, which significantly enhances the waterproof performance of the joint.

[0047] The specific implementation steps of the present invention are described below:

[0048] Step S1: Strengthen the production of the connection device. According to the actual wall thickness of 800-1500mm, select a steel pipe 1 with a diameter of 34-60mm to ensure that the material and strength of the steel pipe 1 meet the engineering requirements. The length of the steel pipe 1 should be customized according to the actual wall thickness of 800-1500mm to ensure that the subsequent steel pipe 1 extends into the prefabricated concave wall 7. The anchoring section length L1 is not less than 40d1, d1 is the diameter of the steel pipe, and the tail of the steel pipe 1 can be fixed in the prefabricated convex wall 6; weld a hexagonal bolt 9 at the head of the steel pipe 1, and the six edges of the hexagonal bolt 9 are welded with a rotating shaft 10, so that the slot device 4 can rotate around the axis; prepare a rubber ring with a spring as a sealing ring 2, ensure that its inner diameter size matches the outer diameter size of the steel pipe 1, and fix it at 1 / 3 of the pipe length of the tail end of the steel pipe 1 to form a concentric ring with the steel pipe 1 and provide additional sealing effect. ; Prepare a rubber ring with a spring as the spring ring 3, ensure that its inner diameter matches the outer diameter of the steel pipe 1, fix it at the front end of the steel pipe 1 at 1 / 6 of the pipe length, and form a concentric ring with the steel pipe 1, ensuring that the size and elasticity of the spring ring 3 and the sealing ring 2 meet the design requirements; select a steel plate with a thickness of 5-10mm to roll into a slot device 4, the slot device 4 is composed of six steel plate rolls, and the six steel plate rolls are respectively combined on the rotating shaft of the hexagonal bolt 9, and the slot device 4 composed of the six steel plate rolls is circumscribed to the spring ring 3, and the test ensures that the steel plate roll can rotate around the hexagonal bolt 9 at the end of the steel pipe 1, and realize the opening and closing function under the elastic force of the spring ring 3; arrange a steel grouting pipe 5 along the inner wall of the steel pipe 1, the diameter of which is between 20-50mm, the length should match the steel pipe 1, and the bottom is a conical tip, which is convenient for driving into the soil;

[0049] Step S2: Production of prefabricated concave wall 7. First, a steel cage of the prefabricated concave wall 7 is produced. The formwork is supported and a space is left at the reserved concrete groove. The space is a cylinder-hexagonal prism combination groove. One end of the cylinder of the cylinder-hexagonal prism combination groove is connected to a bottom surface of the hexagonal prism. The entrance of the groove of the prefabricated concave wall 7 is a circular top surface of the cylinder. Its diameter needs to be reserved 10 mm more than the diameter d1 of the steel pipe. The diameter of the circumscribed circle of the bottom surface of the hexagonal prism of the cylinder-hexagonal prism combination groove needs to be reserved 15 mm more than the diameter d1 of the steel pipe. The height of the cylinder of the cylinder-hexagonal prism combination groove is: L1-(2 / 3)*steel pipe length, so as to ensure that the reinforcing connection device can be smoothly inserted into the groove. Concrete is poured and maintained according to the design requirements to complete the production of the prefabricated concave wall.

[0050] Step S3: Production of prefabricated convex wall 6, the actual wall thickness is 800-1500mm, taking the 6000mm high prefabricated convex wall as an example, firstly, the prefabricated convex wall steel cage is produced, and then the transverse steel bars are welded to the corresponding positions of the steel cage according to the design requirements; nine connection keys are evenly arranged in three rows and three columns on the butt joint wall to prevent the connection between the prefabricated ground connecting walls from being detached. It should be noted that the connection key of the prefabricated convex wall 6 close to the wall side needs to be 50mm away from the edge of the wall; the tail of the steel pipe 1 of the strengthening connection device is fixed in the prefabricated convex wall 6, and its embedded section length L2 in the prefabricated convex wall 6 is not less than 40d1, d1 is the straightness of the steel pipe The anchoring section of a certain length can ensure that there is enough contact area and friction between the joint and the concrete, so as to effectively resist the external load, thereby increasing the bearing capacity of the prefabricated ground-connected wall; secondly, the grouting pipe 5 embedded in the steel pipe 1 extends upward from the tail of the steel pipe 1, ensuring that the grouting pipe 5 extends from the top of the prefabricated convex wall, which is convenient for the subsequent grouting work after the splicing is completed; finally, the beard reinforcement is tied at the tail of the steel pipe 1, and it is connected with the prefabricated convex wall 6 by pouring, so that the joint is not easy to fall out of the prefabricated convex wall 6; after the pouring is completed, the maintenance work is carried out to ensure that the concrete reaches the strength and other performance indicators required by the design, and the production of the prefabricated convex wall is completed;

[0051] Step S4: Ground treatment and measurement to ensure that the foundation is flat and solid, and mark the wall position; use lifting equipment to lift the first prefabricated wall to the designated position and adjust it to a vertical level; install the second wall in the same way, push it to dock after precise alignment, and ensure that the redundant steel bars enter the groove of the cylinder-hexagonal column combination, and the concave and convex wall axes coincide;

[0052] Step S5: When the end of the reinforced connection device of the prefabricated convex wall 6 enters the cylindrical-hexagonal prism combination groove reserved in the prefabricated concave wall 7, it will first pass through the cylindrical groove. At this time, the clamping groove device 4 and the spring ring 3 are first subjected to the annular constraint of the cylindrical groove, shrink and close inward to pass through the cylindrical groove, and after entering the hexagonal groove, the clamping groove device 4 opens outward under the elastic force of the spring ring 3, clamps the groove wall, and waits for the sealing ring 2 to be compressed through the cylindrical groove and enter the hexagonal groove. When it cannot move forward, the prefabricated concave wall 7 and the prefabricated convex wall 6 are preliminarily connected;

[0053] Step S6: Pull the prefabricated convex wall 6 outward horizontally to ensure that the slot device 4 clamps the slot wall of the prefabricated concave wall 7, and check whether the sealing ring is out of place. If it is not out of place, it means that the slot has been sealed, and the mechanical installation inside and outside the wall is completed; if the sealing ring 2 does not enter the hexagonal prism groove or is out of place, repeat step S5 for secondary installation;

[0054] Step S7: Grouting reinforcement is performed inside the gaps between the prefabricated concave wall 7 and the prefabricated convex wall 6 through the reserved grouting pipe 5 .

[0055] The working principle of the present invention is described below:

[0056] The tail of the steel pipe is fixed in the convex wall, and the axis of the steel pipe is aligned with the axis of the joint connection of the concave wall of the prefabricated ground connection wall. This step ensures the accuracy and stability of the subsequent connection. The combination of the steel pipe, the spring ring, and the slot device are extended into the reserved groove of the concave wall. In the initial entry stage, the spring ring is compressed due to the annular restriction of the cylindrical channel of the reserved groove of the concave wall, and drives the slot device to tighten in order to pass through the channel. When they enter the hexagonal prism groove, the spring ring recovers its elastic force due to the release of the annular constraint, pushing the slot device to open outward and firmly snapping into the preset notch in the groove, thereby effectively preventing the strengthening connection device from loosening. Then, continue to push the convex wall until the anchoring length requirement is met (anchoring length L1 ≥ 40d). In this process, the slot device is fully opened and grasps the groove wall, and the steel pipe is firmly fixed in the groove. At the same time, the sealing ring also enters the hexagonal groove through the cylindrical channel of the concave wall reserved groove, and changes from a compressed state to a normal state to achieve a sealing effect on the groove, thereby solving the weakening problem of the prefabricated ground-connected wall connection to a certain extent and enhancing the strength and stability of the prefabricated ground-connected wall connection. When the connection device is fully in place and fixed, cement mortar is injected into the steel pipe, the slot device and the groove wall through the reserved grouting pipe on the inner wall of the steel pipe to improve the overall stiffness of the prefabricated ground-connected wall connection. In this process, the sealing ring and the spring ring work together to achieve the partition reinforcement of the grouting in the groove. At the same time, the sealing ring prevents the slurry from leaking out, ensuring the overall waterproof performance of the prefabricated ground-connected wall assembly. This type of joint also gives full play to the bearing capacity of the prefabricated ground-connected wall by improving the integrity and avoiding economic waste.

[0057] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A prefabricated and assembled ground-connected wall vertical seam horizontal connection structure, characterized in that: It comprises a prefabricated convex wall (6), a prefabricated concave wall (7) and a reinforced connection device, wherein the prefabricated convex wall (6) and the prefabricated concave wall (7) are horizontally butted against each other via the reinforced connection device; The strengthening connection device comprises a steel pipe (1), a sealing ring (2), a spring ring (3), a slot device (4), and a grouting pipe (5); The steel pipe (1) is the main body of the reinforced connection device. The tail of the steel pipe (1) is fixed in the prefabricated convex wall (6). The head of the steel pipe (1) is welded with a hexagonal bolt (9). The hexagonal bolt (9) is connected to the slot device (4) through a rotating shaft (10). The prefabricated concave wall (7) is provided with a cylindrical-hexagonal prism combination groove. The head of the steel pipe (1) extends into the cylindrical-hexagonal prism combination groove. The sealing ring (2) is located at 1 / 3 of the length of the steel pipe (1) from the rear end, is installed on the outer surface of the steel pipe (1), forms a concentric ring with the steel pipe (1), and is a rubber ring with a spring; The spring ring (3) is located 1 / 6 of the length of the steel pipe (1) from the head end, is installed on the outer surface of the steel pipe (1), forms a concentric ring with the steel pipe (1), and is a rubber ring with a spring. The elastic force of the spring drives the slot device (4) circumscribed to the spring ring (3) to open and close; The slot device (4) is located inside the strengthening connection device, connected to the hexagonal bolt (9) at the end of the steel pipe (1) through a rotating shaft (10), and can rotate around the shaft. At the same time, the middle part of the slot device (4) is circumscribed to the spring ring (3), and the clamping function is realized under the elastic force of the spring ring (3): in the initial stage when the strengthening connection device extends into the prefabricated concave wall (7), due to the annular constraint of the notch of the cylindrical-hexagonal prism combination groove, the spring ring (3) will be compressed and drive the slot device (4) to tighten. When the slot device (4) and the spring ring (3) pass through the notch of the cylindrical-hexagonal prism combination groove, the annular constraint is released, and the spring ring (3) will restore the elastic force to push the slot device (4) to clamp at the notch; The grouting pipe (5) is arranged along the inner wall of the steel pipe (1) and extends into the cylindrical-hexagonal prism combination groove of the prefabricated concave wall (7). After the slot device (4) is clamped in the cylindrical-hexagonal prism combination groove, cement mortar is injected into the interlayer between the slot device (4), the groove wall of the cylindrical-hexagonal prism combination groove, the sealing ring (2), and the spring ring (3) through the grouting pipe (5).

2. The prefabricated assembled ground-connected wall vertical seam horizontal connection structure according to claim 1 is characterized in that: The steel pipe (1) has a diameter of 34-60 mm and is suitable for walls with a thickness of 800-1500 mm. Three rows of keys are used, with double keys or triple keys in each row. The distance between the steel pipe (1) and the edge of the wall is not less than 50 mm. The length L1 of the anchoring section of the steel pipe (1) extending into the prefabricated concave wall (7) is not less than 40d1, where d1 is the diameter of the steel pipe. The tail end of the steel pipe (1) is embedded in the prefabricated convex wall (6), and the embedding depth L2 needs to be greater than 40d1, where d1 is the diameter of the steel pipe.

3. The prefabricated assembled ground-connected wall vertical seam horizontal connection structure according to claim 2 is characterized by: The bolt diameter of the hexagonal bolt (9) should be slightly smaller than or equal to the actual outer diameter of the steel pipe (1), and stainless steel or carbon steel bolts of grade 4.8 or 8.8 should be selected.

4. The prefabricated assembled ground-connected wall vertical seam horizontal connection structure according to claim 3 is characterized by: The slot device (4) is made of a steel plate roll with a thickness of 5-10 mm, and the steel plate roll is provided with reserved holes for slurry to flow in during the subsequent grouting.

5. The prefabricated assembled ground-connected wall vertical seam horizontal connection structure according to claim 4 is characterized in that: The grouting pipe (5) is a steel round pipe, the bottom end of which is a conical tip for easy insertion into the soil. The diameter of the grouting pipe (5) is 20-50 mm. Two rows of symmetrical eyelet holes are opened within the lower 1 / 3 of the grouting pipe (5). The eyelet holes have a diameter of 5-8 mm and a spacing of 15 cm. The eyelet holes are sealed with tape before grouting. The strength of the grouting material of the grouting pipe (5) is C50.

6. A construction method for the prefabricated assembled ground-connected wall vertical seam horizontal connection structure as claimed in claim 1, 2, 3, 4 or 5, characterized in that: The following steps are involved: Step S1: Strengthen the production of the connection device. According to the actual wall thickness of 800-1500 mm, select a steel pipe (1) with a diameter of 34-60 mm to ensure that the material and strength of the steel pipe (1) meet the engineering requirements. The length of the steel pipe (1) should be customized according to the actual wall thickness of 800-1500 mm to ensure that the length L1 of the subsequent steel pipe (1) extending into the prefabricated concave wall (7) is not less than 40d1, d1 is the diameter of the steel pipe, and the tail of the steel pipe (1) can be fixed in the prefabricated convex wall (6); weld a hexagonal bolt (9) at the head of the steel pipe (1), and weld six sides of the hexagonal bolt (9) with a rotating shaft (10) so that the slot device (4) can rotate around the axis; prepare a rubber ring with a spring as a sealing ring (2), ensure that its inner diameter size matches the outer diameter size of the steel pipe (1), and fix it at 1 / 3 of the length of the tail end of the steel pipe (1) to form a concentric ring with the steel pipe (1) and provide an additional sealing effect; A rubber ring with a spring is prepared as the spring ring (3), and its inner diameter is ensured to match the outer diameter of the steel pipe (1). The spring ring is fixed to the front end of the steel pipe (1) at 1 / 6 of the pipe length to form a concentric ring with the steel pipe (1), and the size and elasticity of the spring ring (3) and the sealing ring (2) meet the design requirements; a steel plate with a thickness of 5-10 mm is selected to roll into a slot device (4), and the slot device (4) is composed of six steel plate rolls. The six steel plate rolls are respectively assembled on the rotating shaft of the hexagonal bolt (9), and the slot device (4) composed of the six steel plate rolls is circumscribed to the spring ring (3). Tests are performed to ensure that the steel plate roll can rotate around the hexagonal bolt (9) at the end of the steel pipe (1) and realize the opening and closing function under the elastic force of the spring ring (3); a steel grouting pipe (5) is arranged along the inner wall of the steel pipe (1), and its diameter is between 20-50 mm, and its length should match the steel pipe (1). The bottom is a conical tip, which is convenient for driving into the soil; Step S2: Production of the prefabricated concave wall (7), firstly, the steel cage of the prefabricated concave wall (7) is produced, the formwork is supported and attention is paid to leaving a space at the reserved concrete groove, the space being the cylinder-hexagonal prism combination groove, one end of the cylinder of the cylinder-hexagonal prism combination groove is connected to a bottom surface of the hexagonal prism, the entrance of the groove of the prefabricated concave wall (7) is the top circular surface of the cylinder, and its diameter needs to be reserved 10mm more than the diameter d1 of the steel pipe, the diameter of the hexagonal prism bottom surface of the cylinder-hexagonal prism combination groove needs to be reserved 15mm more than the diameter d1 of the steel pipe, the height of the cylinder of the cylinder-hexagonal prism combination groove is: L1-(2 / 3)*steel pipe length, so as to ensure that the reinforcing connection device can be smoothly inserted into the groove, pour concrete and maintain according to the design requirements, and complete the production of the prefabricated concave wall; Step S3: Production of the prefabricated convex wall (6), the actual wall thickness is 800-1500mm, taking the 6000mm high prefabricated convex wall as an example, firstly, a prefabricated convex wall steel cage is produced, and then the transverse steel bars are welded to the corresponding positions of the steel cage according to the design requirements; nine connection keys are evenly arranged in three rows and three columns on the butt joint wall to prevent the connection between the prefabricated ground connecting walls from being detached. It should be noted that the connection key of the prefabricated convex wall (6) close to the wall side needs to be 50mm away from the wall edge; the tail of the steel pipe (1) of the strengthening connection device is fixed in the prefabricated convex wall (6), and the length L2 of the embedded section in the prefabricated convex wall (6) is not less than 40d1, d1 is the diameter of the steel pipe, and one The fixed length anchoring section can ensure that there is sufficient contact area and friction between the joint and the concrete, thereby effectively resisting external loads and increasing the bearing capacity of the prefabricated ground-connected wall; secondly, the grouting pipe (5) pre-buried in the steel pipe (1) extends upward from the tail of the steel pipe (1), ensuring that the grouting pipe (5) extends from the top of the prefabricated convex wall (6), which is convenient for the subsequent grouting work after the splicing is completed; finally, the beard reinforcement is tied to the tail of the steel pipe (1) and connected to the prefabricated convex wall (6) by pouring, so that the joint is not easy to fall out of the prefabricated convex wall (6); after the pouring is completed, maintenance work is carried out to ensure that the concrete reaches the strength and other performance indicators required by the design, and the production of the prefabricated convex wall is completed; Step S4: Ground treatment and measurement to ensure that the foundation is flat and solid, and mark the wall position; use lifting equipment to lift the first prefabricated wall to the designated position and adjust it to a vertical level; install the second wall in the same way, push it to dock after precise alignment, and ensure that the redundant steel bars enter the groove of the cylinder-hexagonal column combination, and the concave and convex wall axes coincide; Step S5: When the end of the reinforced connection device of the prefabricated convex wall (6) enters the cylindrical-hexagonal prism combination groove reserved in the prefabricated concave wall (7), it will first pass through the cylindrical groove. At this time, the clamping groove device (4) and the spring ring (3) are first subjected to the annular constraint of the cylindrical groove, shrink and close inward to pass through the cylindrical groove, and after entering the hexagonal groove, the clamping groove device (4) is pushed outward by the elastic force of the spring ring (3) to clamp the groove wall. When the sealing ring (2) is compressed to pass through the cylindrical groove and enter the hexagonal groove and cannot move forward, the prefabricated concave wall (7) and the prefabricated convex wall (6) are preliminarily connected; Step S6: Pull the prefabricated convex wall (6) outward horizontally to ensure that the slot device (4) clamps the slot wall of the prefabricated concave wall (7), and check whether the sealing ring is out of place. If it is not out of place, it means that the slot has been sealed, and the mechanical installation inside and outside the wall is completed; if the sealing ring (2) does not enter the hexagonal prism slot or is out of place, repeat step S5 for secondary installation; Step S7: Grouting reinforcement is performed inside the gaps of the prefabricated concave wall (7) and the prefabricated convex wall (6) through the reserved grouting pipe (5).

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