Section steel supporting leg underground diaphragm wall

Abstract

The utility model discloses a section steel landing leg underground diaphragm wall which comprises a plurality of prefabricated wall units which are sequentially connected through locking devices, each prefabricated wall unit comprises a reinforced concrete workpiece and a section steel workpiece arranged below the reinforced concrete workpiece, and an expanding and supporting mechanism is arranged between every two adjacent prefabricated wall units. The lock catch device comprises a clamping groove formed in the side face of one prefabricated wall unit and a buckle arranged on the side face of the other prefabricated wall unit and matched with the clamping groove, and every two adjacent prefabricated wall units are expanded through an expanding mechanism and lock the clamping groove and the buckle in a buckled mode. According to the scheme, the gap between the two adjacent reinforced concrete parts is expanded through the expansion device, the gap between the buckle structures is eliminated, the buckle structures are tightly buckled and locked, and the connection strength and the connection stability between the two adjacent reinforced concrete parts in the underground cement soil continuous wall are improved; the problems of pile pitching soil squeezing and large soil replacement amount in the pile pitching process of the prefabricated wall unit are solved, and the effect of slightly disturbing the surrounding environment in the construction process is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of foundation pit enclosure, in particular to an underground continuous wall with steel legs. Background Art

[0002] In the existing construction of building foundation pits, the underground continuous wall is used to replace the traditional cast-in-place reinforced concrete building foundation pit side wall, which can not only serve as the foundation pit enclosure structure of the construction building, but also serve as the permanent building foundation pit side wall. The existing underground continuous wall includes an underground cement soil continuous wall and prefabricated reinforced concrete components inserted in the underground cement soil continuous wall. The prefabricated reinforced concrete components are arranged and distributed in sequence along the length direction of the underground cement soil continuous wall. The adjacent two prefabricated reinforced concrete components are connected as a whole through a plug-in device. Since there must be a gap between the plug-in devices of the adjacent two prefabricated reinforced concrete components, the stability of the underground continuous wall is poor during the plug-in process of the prefabricated reinforced concrete components and the curing process, and the prefabricated reinforced concrete components are easily offset.

[0003] In addition, during the construction of the foundation pit, the part above the pit bottom has a higher bending strength to the foundation pit retaining structure, while the part below the pit bottom is an embedded section and is subject to a smaller bending moment. The existing underground cement soil continuous wall uses prefabricated reinforced concrete components with the same upper and lower sections for pile insertion, which causes the problem of large soil extrusion and replacement in the underground cement soil continuous wall. In order to smoothly insert the piles, the mud concentration needs to be diluted, resulting in a reduction in the strength of the underground cement soil continuous wall, which affects the durability and service life of the concrete to a certain extent.

[0004] For example, China's patent publication number CN111980046A, published on November 24, 2020, is titled "An underground continuous wall and its construction method", which includes a cement-soil water-stop curtain, prestressed pipe piles and prefabricated steel pipe components. Prefabricated steel pipe components are driven into the cement-soil water-stop curtain, and prestressed pipe piles are arranged in the steel pipe component unit. The center of the closed surface formed on the cross-section of the steel pipe component unit coincides with the pile center of the prestressed pipe pile.

[0005] The disadvantages of the existing patent are: during the construction and curing process of the existing underground continuous wall, due to the gap between the plug-in devices of the two adjacent prefabricated reinforced concrete components, the stability of the prefabricated reinforced concrete components located in the underground cement soil continuous wall is poor and it is easy to cause displacement; and the existing underground cement soil continuous wall uses prefabricated reinforced concrete components with consistent upper and lower cross-sections for pile insertion, which causes the problem of large soil squeezing and replacement of soil during pile insertion in the underground cement soil continuous wall. In order to smoothly insert the piles, the mud concentration needs to be diluted, resulting in a reduction in the strength of the underground cement soil continuous wall, which affects the durability and service life of the underground continuous wall to a certain extent. Utility Model Content

[0006] The first purpose of the utility model is to solve the problem that the prefabricated reinforced concrete components located in the underground cement soil continuous wall in the existing underground continuous wall have poor stability and are easy to deviate during the construction and curing process, and to provide a steel support leg underground continuous wall that improves the connection stability between the prefabricated reinforced concrete components.

[0007] The second purpose of the utility model is to solve the problem that the existing underground cement continuous wall uses prefabricated reinforced concrete components with consistent upper and lower cross-sections for pile insertion, which causes a large amount of soil squeezing and replacement in the underground cement soil continuous wall, and the mud is diluted to reduce the overall strength, and to provide a steel-legged underground continuous wall that saves concrete materials and improves the strength of the underground continuous wall.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A steel-leg underground continuous wall comprises a plurality of prefabricated wall units connected in sequence by locking devices, the prefabricated wall units comprise reinforced concrete parts and steel-legged parts arranged below the reinforced concrete parts, an expansion mechanism is arranged between two adjacent prefabricated wall units, the locking device comprises a slot arranged on the side of one of the prefabricated wall units and a buckle arranged on the side of the other prefabricated wall unit to cooperate with the slot, and the adjacent prefabricated wall units are expanded and locked with the slot and the buckle by the expansion mechanism. In the steel-leg underground continuous wall described in this solution, the prefabricated wall units are arranged in the cement-soil continuous wall and are arranged in sequence along the length direction of the cement-soil continuous wall. Two adjacent prefabricated wall units are connected by a buckle structure. Since there must be a gap between the buckle structures, the adjacent prefabricated wall units are prone to offset and dislocation during assembly and curing of the underground cement soil continuous wall. The gap between the adjacent reinforced concrete parts is expanded by an expansion device to eliminate the gap between the buckle structures, so that the buckle structures are tightly locked. The adjacent prefabricated wall units are expanded and locked along the length direction of the underground cement soil continuous wall by the expansion device, thereby improving the connection strength and connection stability between the adjacent prefabricated wall units in the underground cement soil continuous wall. The problem that the existing underground continuous wall has poor stability and is prone to offset during construction and curing due to the gap between the plug-in devices of the adjacent prefabricated wall units is solved; the surface of the underground continuous wall is subjected to uniform force and has strong bending and torsion resistance.

[0010] In the construction of building foundation pits, the part above the pit bottom has a higher bending strength to the foundation pit retaining structure, while the part below the pit bottom is an embedded section and is subject to a smaller bending moment. In the existing underground cement soil continuous wall, prefabricated reinforced concrete parts with the same upper and lower sections are used for pile insertion, which causes the problem of large soil displacement and soil replacement during pile insertion in the underground cement soil continuous wall. In order to smoothly insert the piles, the mud concentration needs to be diluted, which reduces the strength of the underground cement soil continuous wall and affects the durability and service life of the underground continuous wall to a certain extent. In this scheme, a prefabricated wall unit consisting of reinforced concrete parts and steel parts arranged below the reinforced concrete parts is used for pile insertion. The part above the pit bottom has a higher bending strength to the foundation pit retaining structure, so prefabricated reinforced concrete parts are used; the part below the pit bottom is an embedded section and is subject to a smaller bending moment, so steel parts are used to meet the stiffness requirements and save a large amount of concrete materials. In addition, the cross-section of the steel parts is small, which avoids the problem of large soil displacement and soil displacement during pile insertion of the prefabricated wall unit, and achieves the effect of micro-disturbance to the surrounding environment during construction. It also avoids the problem of diluting the mud concentration for smooth pile insertion, improves the strength of the underground cement soil continuous wall, and to a certain extent improves the durability and service life of the underground cement soil continuous wall.

[0011] Preferably, it includes a cement-soil continuous wall, wherein the prefabricated wall units are arranged in the cement-soil continuous wall and are arranged in sequence along the length direction of the cement-soil continuous wall. The prefabricated wall units are inserted in sequence into the underground cement-soil continuous wall, and two adjacent prefabricated wall units are connected by buckles and slots, wherein the buckles are inserted into the slots. Since there must be a gap between the buckles and the slots, an expansion device is required to expand and lock the buckle structure along the length direction of the underground cement-soil continuous wall, so as to improve the connection strength and connection stability between two adjacent prefabricated wall units in the underground cement-soil continuous wall.

[0012] Preferably, the expansion mechanism includes two expansion plates rotatably connected by a rotating shaft and an expansion block located between the two expansion plates, the rotating shaft is provided with a screw, the expansion block is sleeved on the screw and limited on the screw by a limiter, the limiter is threadedly connected to the screw, and the expansion plate abuts against one side surface of the reinforced concrete part through the expansion block. After the prefabricated wall unit is inserted into the underground cement soil continuous wall, the expansion device is inserted between two adjacent reinforced concrete parts, the limiter is rotated so that the expansion part is inserted between the two rotatably arranged expansion plates, so that the expansion plate props up the two adjacent reinforced concrete parts, so that the buckle and the slot of the buckle structure are engaged and clamped, the friction between the buckle and the slot is increased, so that the buckle structure is stably connected and not easy to deviate along the length and width directions of the underground cement soil continuous wall.

[0013] Preferably, the locking device comprises a first slot provided on the side of one of the reinforced concrete parts and a first buckle provided on the side of the other reinforced concrete part, and the first buckle cooperates with the first slot. The first slot passes through the upper end face and the lower end face of the reinforced concrete part. The first slot and the first buckle are expanded and locked by the expansion device to achieve the connection strength between the prefabricated wall units.

[0014] Preferably, the locking device further comprises a second slot provided on the side of one of the steel parts and a second clip provided on the side of the other steel part, the second clip cooperates with the second slot, and the second slot passes through the upper and lower end surfaces of the steel part. The cooperation between the second slot and the second clip enables a better guiding effect when the prefabricated wall unit is inserted. The second clip on one side of the same prefabricated wall unit is located at the lower end of the first clip, the second slot on one side of the same prefabricated wall unit is located at the lower end of the first slot, the upper end of the second slot passes through the lower end of the first slot, the first clip is first inserted into the first slot, and then the second clip is smoothly inserted into the second slot.

[0015] Preferably, the locking device comprises two first angle steels vertically arranged on the side of one of the prefabricated wall units and two second angle steels vertically arranged on the side of the other prefabricated wall unit, one side plate of the first angle steel is fixed to the prefabricated wall unit by a locking member, and the other side plate of the first angle steel is parallel to the side of the prefabricated wall unit where the first angle steel is located to form the slot that matches the buckle; one side plate of the second angle steel is fixed to the prefabricated wall unit by a locking member, and the other side plate of the second angle steel is parallel to the side of the prefabricated wall unit where the second angle steel is located, and the expansion device is placed between the two first angle steels on the side of the prefabricated wall unit. The two first steel plates on one side of the same prefabricated wall unit are symmetrically arranged or arranged in the same direction, and the first steel plate and the second steel plate are matched one by one. The two second steel plates on one side of the same prefabricated wall unit are symmetrically arranged or arranged in the same direction, and the first steel plate and the second steel plate are matched one by one. The expansion device is located between two groups of first and second steel plates that are locked and connected between two adjacent prefabricated wall units, so that the expansion device can stably expand along the length direction of the underground cement soil continuous wall and lock the buckle structure.

[0016] Preferably, two first angle steels on one side of one prefabricated wall unit are symmetrically arranged, and the two first angle steels and the side of the prefabricated wall unit form the slot; two second angle steels on one side of another prefabricated wall unit are symmetrically arranged, and the two second angle steels form a buckle that matches the slot, so as to enable a more stable plug-in connection.

[0017] Preferably, the cross-section of the steel-shaped part is smaller than the cross-section of the reinforced concrete part. The part above the pit bottom has a higher bending strength to the foundation pit retaining structure, so prefabricated reinforced concrete parts are used; the part below the pit bottom belongs to the embedded section, which is subject to a smaller bending moment, so the use of steel-shaped parts can meet the stiffness requirements and save a lot of concrete materials. In addition, the cross-section of the steel-shaped part is small, which avoids the problem of large soil displacement and pile squeezing during the insertion of prefabricated wall units, and achieves the effect of micro-disturbance to the surrounding environment during construction. It also avoids the problem of diluting the mud concentration for smooth pile insertion, improves the strength of the underground cement soil continuous wall, and to a certain extent improves the durability and service life of the underground cement soil continuous wall.

[0018] Preferably, bolts are embedded in the upper end of the steel member, and the lower end of the reinforced concrete member and the upper end of the steel member are connected as a whole by bolts.

[0019] Preferably, the upper and lower ends of the reinforced concrete parts are pre-embedded with steel sleeves, and the number of the steel sleeves is multiple. The steel sleeves can be used to extend the reinforced concrete parts, and can also be used to connect the concrete crown beam upwards and the steel end plate downwards.

[0020] Preferably, the outer side of the flange of the reinforced concrete part is provided with a plurality of bolt holes and high-strength bolts. The bolt holes and high-strength bolts are preset on the outer side of the flange of the reinforced concrete part for connecting the concrete waist beam or steel waist beam of the support system after the subsequent foundation pit excavation, and can also be used to connect the waterproof material of the basement outer wall. The pre-buried high-strength bolts or bolt holes are removed for installation when the purlin / waterproof membrane needs to be connected.

[0021] Therefore, the utility model has the following beneficial effects: (1) the gap between two adjacent reinforced concrete parts is expanded by the expansion device, the gap between the buckle structure is eliminated, and the buckle structure is tightly locked. The adjacent reinforced concrete parts are expanded and locked along the length direction of the underground cement soil continuous wall by the expansion device, thereby improving the connection strength and connection stability between the two adjacent reinforced concrete parts in the underground cement soil continuous wall; (2) the problem of large amount of soil displacement and pile squeezing caused by pile insertion of prefabricated wall units is avoided, and the effect of micro-disturbance to the surrounding environment is achieved during the construction process. It also avoids the problem of diluting the mud concentration for smooth pile insertion, thereby improving the strength of the underground cement soil continuous wall and, to a certain extent, improving the durability and service life of the underground cement soil continuous wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an assembly drawing of the utility model.

[0023] Figure 2 It is a structural schematic diagram of the utility model.

[0024] Figure 3 It is a structural schematic diagram of the medium-sized steel component of the utility model.

[0025] Figure 4 It is a structural schematic diagram of the expansion device in the utility model.

[0026] Figure 5 yes Figure 1 A partial enlarged view of point A in the middle.

[0027] Figure 6 yes Figure 2 A partial enlarged view of point B in the middle.

[0028] As shown in the figure:

[0029] Reinforced concrete parts 1. Reinforcement sleeve 1.1.

[0030] First card slot 2.1, second card slot 2.2, first buckle 2.3, second buckle 2.4,

[0031] Expansion mechanism 3, expansion plate 3.1, expansion member 3.2, screw rod 3.3, limit member 3.4, rotating shaft 3.5,

[0032] Insert rod 4,

[0033] Steel parts 5. Bolts 5.1. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the technical solution embodiments of the utility model clearer, the utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0035] Embodiment 1, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 A steel-legged underground continuous wall shown in the figure comprises an underground cement-soil continuous wall, wherein the underground cement-soil continuous wall is provided with prefabricated wall units arranged in sequence along the length direction of the underground cement-soil continuous wall, the prefabricated wall units comprising reinforced concrete parts 11 and steel-shaped parts 5 arranged below the reinforced concrete parts 11, two adjacent prefabricated wall units are connected by a snap-fit ​​structure, an expansion device 3 is provided between the two adjacent prefabricated wall units, and the two adjacent prefabricated wall units are expanded by the expansion device 3 and locked with the snap-fit ​​structure.

[0036] In the above-mentioned embodiment, a steel-leg underground continuous wall is described, where two adjacent prefabricated wall units are connected by a buckle structure. Since there must be a gap between the buckle structures, the adjacent prefabricated wall units are prone to offset and misalignment during assembly and curing of the underground cement soil continuous wall. The gap between the adjacent reinforced concrete parts 11 is expanded by the expansion device 3 to eliminate the gap between the buckle structures, so that the buckle structures are tightly locked. The adjacent prefabricated wall units are expanded and locked by the expansion device 3 along the length direction of the underground cement soil continuous wall, thereby improving the connection strength and connection stability between the adjacent prefabricated wall units in the underground cement soil continuous wall. The problem that the existing underground continuous wall has poor stability and is prone to offset during construction and curing due to the gap between the plug-in devices of the adjacent prefabricated wall units is solved; the surface of the underground continuous wall is subjected to uniform force and has strong bending and torsion resistance.

[0037] During the construction of building foundation pits, the part above the pit bottom has a higher bending strength to the foundation pit retaining structure, while the part below the pit bottom is an embedded section and is subject to less bending moment. In the existing underground cement soil continuous wall, prefabricated reinforced concrete parts 11 with the same upper and lower cross-sections are used for pile insertion, which causes the problem of large soil squeezing and replacement of soil during pile insertion in the underground cement soil continuous wall. In order to smoothly insert the piles, the mud concentration needs to be diluted, resulting in a reduction in the strength of the underground cement soil continuous wall, which affects the durability and service life of the underground continuous wall to a certain extent. In this solution, a prefabricated wall unit consisting of a reinforced concrete part 11 and a steel part 5 arranged below the reinforced concrete part 11 is used for pile insertion. The part above the pit bottom has a higher bending strength to the foundation pit retaining structure, so a prefabricated reinforced concrete part 11 is used; the part below the pit bottom is an embedded section and is subject to less bending moment, so a steel part 5 is used to meet the stiffness requirements and save a large amount of concrete materials. The cross section of the steel member 5 is small, which avoids the problem of soil squeezing and large soil displacement during the prefabricated wall unit pile insertion process, and achieves the effect of micro-disturbance to the surrounding environment during the construction process. It also avoids the problem of diluting the mud concentration for smooth pile insertion, improves the strength of the underground cement soil continuous wall, and to a certain extent improves the durability and service life of the underground cement soil continuous wall.

[0038] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6The reinforced concrete parts 111 shown are prefabricated in the factory, and their length is determined according to the number of basement floors. Generally, it is considered to be 1~3m beyond the basement depth. The total length can be designed to be 4m~20m. It can be used as a retaining structure for foundation pit protection and can also serve as the exterior wall of the basement structure. It is prefabricated in the factory, with good quality control and fast production speed. The retaining pile wall does not need to be pulled out after the construction is completed, which can avoid the ground deformation problem caused by the pile pulling process of the existing prefabricated construction methods such as SMW method, TRD method, HU method, CSM method, etc.

[0039] Specifically, the cross-section of the steel component 5 is smaller than the cross-section of the reinforced concrete component 11. The portion above the pit bottom has a higher bending strength to the foundation pit retaining structure, so a prefabricated reinforced concrete component 11 is used; the portion below the pit bottom belongs to the embedded section, which is subject to a smaller bending moment, so the steel component 5 is used to meet the stiffness requirements and save a large amount of concrete materials. In addition, the steel component 5 has a small cross-section, which avoids the problem of large soil displacement and pile squeezing during the insertion of prefabricated wall units, and achieves the effect of micro-disturbance to the surrounding environment during construction. It also avoids the problem of diluting the mud concentration for smooth pile insertion, improves the strength of the underground cement soil continuous wall, and to a certain extent improves the durability and service life of the underground cement soil continuous wall.

[0040] like Figure 3 As shown, the lower end of the reinforced concrete component 11 and the upper end of the steel component 5 are connected as a whole by bolts 5.1.

[0041] Further optimization of reinforced concrete component 11, such as Figure 1 , Figure 2 , Figure 5 , Figure 6 As shown, the upper and lower ends of the reinforced concrete part 11 are both provided with a steel sleeve 1.1, and the steel sleeve 1.1 is pre-embedded in the reinforced concrete part 11. The steel sleeve 1.1 can be used to extend the reinforced concrete part 11, and can also be used to connect the concrete crown beam upwards and the steel end plate downwards.

[0042] Further optimization of reinforced concrete component 11, such as Figure 1 , Figure 2 , Figure 5 , Figure 6 As shown, the outer side of the flange of the reinforced concrete component 11 is provided with a plurality of bolt 5.1 holes and high-strength bolts 5.1. The bolt 5.1 holes and high-strength bolts 5.1 are preset on the outer side of the flange of the reinforced concrete component 11 for connecting the concrete waist beam or steel waist beam of the support system after the subsequent foundation pit excavation, and can also be used to connect the waterproof material of the basement outer wall. The pre-buried high-strength bolts 5.1 or bolt 5.1 holes are removed for installation when the purlin / waterproof membrane needs to be connected.

[0043] Embodiment 1, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 A steel-legged underground continuous wall shown in the figure comprises an underground cement-soil continuous wall, wherein the underground cement-soil continuous wall is provided with prefabricated wall units arranged in sequence along the length direction of the underground cement-soil continuous wall, the prefabricated wall units comprising reinforced concrete parts 11 and steel-shaped parts 5 arranged below the reinforced concrete parts 11, two adjacent prefabricated wall units are connected by a snap-fit ​​structure, an expansion device 3 is provided between the two adjacent prefabricated wall units, and the two adjacent prefabricated wall units are expanded by the expansion device 3 and locked with the snap-fit ​​structure.

[0044] In this embodiment, Figure 1 , Figure 2 , Figure 5 , Figure 6 As shown, the buckle structure includes a slot provided on the side of one of the prefabricated wall units and a buckle provided on the side of another prefabricated wall unit, and the buckle cooperates with the slot. The prefabricated wall units are inserted into the underground cement soil continuous wall in sequence, and the adjacent prefabricated wall units are connected by the buckle and the slot, and the buckle is inserted into the slot. Since there must be a gap between the buckle and the slot, an expansion device 3 is required to expand and lock the buckle structure along the length direction of the underground cement soil continuous wall, so as to improve the connection strength and connection stability between the adjacent prefabricated wall units in the underground cement soil continuous wall.

[0045] In this embodiment, Figure 1 , Figure 2 , Figure 5 , Figure 6 As shown, the expansion device 3 includes two expansion plates 3.1 rotatably connected by a rotating shaft 3.5 and an expansion piece 3.2 located between the two expansion plates 3.1, the rotating shaft 3.5 is provided with a screw 3.3, the expansion piece 3.2 is sleeved on the screw 3.3 and limited on the screw 3.3 by a stopper 3.4, and the expansion plate 3.1 abuts against the side of the reinforced concrete member 11 through the expansion piece 3.2. After the prefabricated wall unit is inserted into the underground cement soil continuous wall, the expansion device 3 is inserted between two adjacent reinforced concrete members 11, and the stopper 3.4 is rotated so that the expansion piece 3.2 is inserted between the two rotationally arranged expansion plates 3.1, so that the expansion plate 3.1 props up the two adjacent reinforced concrete members 11, so that the buckle and the slot of the buckle structure are engaged and clamped, and the friction between the buckle and the slot is increased, so that the buckle structure is stably connected and not easy to deviate along the length direction and width direction of the underground cement soil continuous wall.

[0046] Further optimize the buckle structure, such as Figure 1 , Figure 2 , Figure 3 As shown, the buckle structure includes a first buckle 2.1 provided on the side of one of the reinforced concrete parts 11 and a first buckle 2.3 provided on the side of another reinforced concrete part 11, the first buckle 2.3 cooperates with the first buckle 2.1, and the first buckle 2.1 penetrates the upper end face and the lower end face of the reinforced concrete part 11. The first buckle 2.1 and the first buckle 2.3 are expanded and locked by the expansion device 3 to achieve the connection strength between the prefabricated wall units. Figure 1 , Figure 2 , Figure 3 As shown, the buckle structure also includes a second buckle 2.2 provided on the side of one of the steel parts 5 and a second buckle 2.4 provided on the side of the other steel part 5, the second buckle 2.4 cooperates with the second buckle 2.2, and the second buckle 2.2 penetrates the upper end face and the lower end face of the steel part 5. The second buckle 2.2 and the second buckle 2.4 cooperate so that the prefabricated wall unit can play a better guiding role when the pile is inserted. The second buckle 2.4 on one side of the same prefabricated wall unit is located at the lower end of the first buckle 2.3, and the second buckle 2.2 on one side of the same prefabricated wall unit is located at the lower end of the first buckle 2.1, and the upper end of the second buckle 2.2 penetrates the lower end of the first buckle 2.1. The first buckle 2.3 is first inserted into the first buckle 2.1, and then the second buckle 2.4 is smoothly inserted into the second buckle 2.2.

[0047] The buckle structure is further optimized, as shown in the figure Figure 1 , Figure 2As shown, the buckle structure includes two first steel plates vertically arranged on the side of one of the prefabricated wall units and two second steel plates vertically arranged on the side of the other prefabricated wall unit. One side plate of the first steel plate is fixed to the prefabricated wall unit by bolts 5.1, and the other side plate of the first steel plate is parallel to the side of the prefabricated wall unit where the first steel plate is located to form the clamping groove; one side plate of the second steel plate is fixed to the prefabricated wall unit by bolts 5.1, and the other side plate of the second steel plate is parallel to the side of the prefabricated wall unit where the second steel plate is located, and the expansion device 3 is located between the two first steel plates on the side of the prefabricated wall unit. The two first steel plates on one side of the same prefabricated wall unit are symmetrically arranged or arranged in the same direction, and the first steel plate and the second steel plate are matched one by one. The two second steel plates on one side of the same prefabricated wall unit are symmetrically arranged or arranged in the same direction, and the first steel plate and the second steel plate are matched one by one. The expansion device 3 is located between two groups of first and second steel plates that are locked and connected between two adjacent prefabricated wall units, so that the expansion device 3 can stably expand along the length direction of the underground cement soil continuous wall and lock the buckle structure.

[0048] Specifically, the cross-section of the steel component 5 is smaller than the cross-section of the reinforced concrete component 11 .

[0049] like Figure 3 As shown, the lower end of the reinforced concrete component 11 and the upper end of the steel component 5 are connected as a whole by bolts 5.1.

[0050] Further optimization of reinforced concrete component 11, such as Figure 1 , Figure 2 , Figure 5 , Figure 6 As shown, the upper and lower ends of the reinforced concrete component 11 are both provided with a steel sleeve 1.1, and the steel sleeve 1.1 is pre-embedded in the reinforced concrete component 11.

[0051] Further optimization of reinforced concrete component 11, such as Figure 1 , Figure 2 , Figure 5 , Figure 6 As shown, the outer side surface of the flange of the reinforced concrete component 11 is provided with a plurality of bolt 5.1 holes and high-strength bolts 5.1.

[0052] The buckle structure and the expansion device are further optimized. A plug rod 4 is provided in the first slot 2.1. The first buckle 2.3 and the plug rod 4 are both inserted in the first slot 2.1. The plug rod 4 is located on the other side of the first buckle 2.3 and the first slot 2.1. The plug rod 4 is used to fill the gap in the first slot 2.1. When the expansion device 3 expands along the length direction of the underground cement soil continuous wall and locks the buckle structure 2, there is a gap between the other side of the first buckle 2.3 and the first slot 2.1 and the first slot 2.1. The plug rod 4 is inserted into the gap to further improve the stability of the buckle structure 2.

[0053] In summary, both Embodiment 1 and Embodiment 2 have the following beneficial effects: (1) The gap between two adjacent reinforced concrete parts 11 is expanded by the expansion device 3, the gap between the buckle structure is eliminated, and the buckle structure is tightly locked. The adjacent reinforced concrete parts 11 are expanded and buckled along the length direction of the underground cement soil continuous wall by the expansion device 3, thereby improving the connection strength and connection stability between the two adjacent reinforced concrete parts 11 in the underground cement soil continuous wall; (2) The problem of large amount of soil displacement and pile squeezing caused by pile insertion of prefabricated wall units is avoided, and the effect of micro-disturbance to the surrounding environment during construction is achieved. It also avoids the problem of diluting the mud concentration for smooth pile insertion, improves the strength of the underground cement soil continuous wall, and improves the durability and service life of the underground cement soil continuous wall to a certain extent.

[0054] The specific embodiments described above are only preferred implementations of the present invention, and are not intended to limit the specific implementation scope of the present invention. All equivalent changes made in accordance with the shape and structure of the present invention should be included in the protection scope of the present invention.

Claims

1. A steel leg underground continuous wall, characterized in that: The invention comprises a plurality of prefabricated wall units connected in sequence by locking devices, wherein the prefabricated wall units comprise reinforced concrete parts and steel parts arranged below the reinforced concrete parts, and an expansion mechanism is arranged between two adjacent prefabricated wall units, wherein the locking device comprises a slot arranged on the side of one of the prefabricated wall units and a buckle arranged on the side of the other prefabricated wall unit and matched with the slot, and the adjacent prefabricated wall units are expanded and locked with the slot and the buckle by the expansion mechanism.

2. The underground continuous wall with steel legs according to claim 1, characterized in that: It comprises a cement-soil continuous wall, wherein the prefabricated wall units are arranged in the cement-soil continuous wall and are arranged in sequence along the length direction of the cement-soil continuous wall.

3. The underground continuous wall with steel legs according to claim 2, characterized in that: The expansion mechanism includes two expansion plates rotatably connected by a rotating shaft and an expansion block located between the two expansion plates, the rotating shaft is provided with a screw rod, the expansion block is sleeved on the screw rod and limited on the screw rod by a limiting member, the limiting member is threadedly connected to the screw rod, and the expansion plate abuts against one side surface of the reinforced concrete component through the expansion block.

4. The underground continuous wall with steel legs according to claim 3, characterized in that: The locking device comprises a first locking groove arranged on the side surface of one of the reinforced concrete parts and a first buckle arranged on the side surface of the other reinforced concrete part, and the first buckle cooperates with the first locking groove.

5. The underground continuous wall with steel legs according to claim 4, characterized in that: The locking device also includes a second slot arranged on the side of one of the steel parts and a second buckle arranged on the side of the other steel part, the second buckle cooperates with the second slot, and the second slot passes through the upper and lower end surfaces of the steel part.

6. The underground continuous wall with steel legs according to claim 1, 2, 3, 4 or 5, characterized in that: The locking device includes two first angle steels vertically arranged on the side of one of the prefabricated wall units and two second angle steels vertically arranged on the side of the other prefabricated wall unit, one side plate of the first angle steel is fixed to the prefabricated wall unit by a locking piece, and the other side plate of the first angle steel is parallel to the side of the prefabricated wall unit where the first angle steel is located to form the slot that cooperates with the buckle; one side plate of the second angle steel is fixed to the prefabricated wall unit by a locking piece, and the other side plate of the second angle steel is parallel to the side of the prefabricated wall unit where the second angle steel is located, and the expansion device is placed between the two first angle steels on the side of the prefabricated wall unit.

7. The underground continuous wall with steel legs according to claim 6, characterized in that: The two first angle steels on one side surface of one prefabricated wall unit are symmetrically arranged, and the two first angle steels and the side surface of the prefabricated wall unit constitute the slot; the two second angle steels on one side surface of the other prefabricated wall unit are symmetrically arranged, and the two second angle steels constitute a buckle that cooperates with the slot.

8. The underground continuous wall with steel legs according to claim 2, 3, 4 or 5, characterized in that: The cross-section of the steel section is smaller than the cross-section of the reinforced concrete section.

9. The underground continuous wall with steel legs according to claim 8, characterized in that: Bolts are pre-embedded at the upper end of the steel-shaped component, and the lower end of the reinforced concrete component and the upper end of the steel-shaped component are connected as a whole through the bolts.

10. The underground continuous wall with steel legs according to claim 9, characterized in that: The upper end and the lower end of the reinforced concrete part are both pre-embedded with steel sleeves, and the number of the steel sleeves is multiple.

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