Underground diaphragm wall node wall structure, construction method thereof and underground diaphragm wall construction method

Abstract

The invention relates to an underground diaphragm wall node wall structure, a construction method thereof and an underground diaphragm wall construction method. A diaphragm wall node wall structure comprises a prefabricated part, a first filling body and a second filling body, the prefabricated part is formed by connecting a plurality of node connecting parts located on the same circumference and arc-shaped connecting parts between the adjacent node connecting parts in the circumferential direction, a closed space is formed, and a pouring space can be provided for concrete to form the first filling body; the strength of the underground diaphragm wall joint wall is met, the second filling body is gravel or an undisturbed stratum, the prefabricated part can be stabilized, the groove milling balance condition of the to-be-constructed second-stage rectangular underground diaphragm wall section is provided, and the condition can be provided for construction of the to-be-constructed second-stage rectangular underground diaphragm wall section; the prefabricated part is of a steel structure or a reinforced concrete structure, can be machined and prefabricated in a factory, is convenient to transport and not prone to deformation, and can meet the construction requirement of the underground diaphragm wall joint.

Description

Technical Field

[0001] This invention relates to the field of diaphragm wall technology, and in particular to a diaphragm wall node wall structure, its construction method, and a diaphragm wall construction method. Background Technology

[0002] During diaphragm wall construction, cross-shaped, X-shaped, and Y-shaped diaphragm wall nodes may appear. For example, a figure-eight diaphragm wall may have two Y-shaped diaphragm wall nodes in the middle. The construction of these diaphragm wall nodes requires first binding the reinforcing cage, and then milling the groove shape of the diaphragm wall node using equipment such as a diaphragm wall milling machine. Due to the complexity of the groove shape of the diaphragm wall node and the possible presence of curved sections, the milling process becomes complicated and cumbersome. Moreover, since this type of Y-shaped diaphragm wall node is an irregular structure (not a conventional rectangular structure), it is more difficult to bind the reinforcing cage on site. A special reinforcing cage production line needs to be set up on site, which results in a large footprint and may pose a significant risk of interference with other equipment. Therefore, it is considered to process the reinforcing cage of the diaphragm wall node in the factory and then transport it to the site for installation. However, the reinforcing cage of this type of diaphragm wall node is large in size and heavy in weight, which may cause inconvenience and deformation during transportation. As a result, the construction of the reinforcing cage of the diaphragm wall node is subject to limitations in terms of site and transportation, making the construction quite difficult. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies, such as the difficulty of constructing steel cages for diaphragm wall nodes due to site and transportation limitations, as well as the complexity of the groove shape and the cumbersome milling process of diaphragm wall nodes. This invention provides a diaphragm wall node structure, its construction method, and a diaphragm wall construction method.

[0004] In a first aspect, the present invention provides a diaphragm wall node wall structure, comprising:

[0005] The precast component is a steel structure or a reinforced concrete structure. The precast component includes several node connection parts located on the same circumference and arc-shaped connection parts between adjacent node connection parts in the circumferential direction. The node connection part is a channel-shaped structure facing the connection end of the rectangular diaphragm wall segment to be constructed in the second phase. The two channel walls of the channel-shaped structure are arranged in parallel and can be located on both sides of the connection end of the rectangular diaphragm wall segment to be constructed in the second phase. The arc-shaped connection part is an arc-shaped facade structure. The arc-shaped facade structure connects the adjacent channel walls of two circumferentially connected node connection parts. All the arc-shaped connection parts and all the node connection parts are connected to form a closed space. The first filling material is concrete, and the first filling material fills the closed space. The second filling body is located outside the original stratum. The second filling body is composed of gravel or original stratum and fills the outside of the closed space.

[0006] Preferably, the bottom of the groove structure is a vertical surface structure; When the prefabricated component is a steel structure, the outer side of the groove opening of the adjacent groove wall of the two circumferentially connected node connection parts of the arc-shaped facade structure is connected, and the node connection parts are reinforced by welding reinforcing steel bars within the closed space. When the precast component is a reinforced concrete structure, the outer side of the arc-shaped facade structure is connected to the outer side of the groove of the adjacent groove wall of the two circumferentially connected node connection parts, and the inner side of all the arc-shaped facade structures and the inner side of all the node connection parts form a circular closed space.

[0007] Preferably, the bottom of the trough structure is an arc-shaped facade structure, the prefabricated component is a steel structure, and the bottom of all the trough structures and all the arc-shaped connecting parts are connected to form a steel pipe.

[0008] Preferably, when the second filler is crushed stone, the prefabricated component further includes a bottom sealing plate, which is connected to the bottom of the closed space to form a bottom seal.

[0009] In a second aspect, the present invention provides a construction method for a diaphragm wall node structure, which is used to construct the diaphragm wall node structure by transporting prefabricated components to the site for construction after processing in the factory.

[0010] Preferably, when the local diaphragm wall node structure is located in a soil layer with low settlement resistance (such as soft soil, or general clay, sandy soil, etc.), the precast components are steel structures, the bottom of the trough structure is an arc-shaped facade structure, and the bottom of all the trough structures is connected to all the arc-shaped connection parts to form a steel pipe, the construction steps are as follows: S1A, at the pre-set location of the diaphragm wall node, the precast components are completely pressed from the ground surface into the original stratum. S2A. Excavate the soil from top to bottom and clean the hole within the closed space of the precast component; S3A. Place a circular steel cage in the closed space, and pour concrete in the closed space of the precast component to form the first filling layer.

[0011] Preferably, the construction steps are as follows: S1B. Place a steel casing at the preset position of the diaphragm wall node wall structure, then construct the first circular pile hole with the help of the steel casing, and clean the first circular pile hole so that the prefabricated component can be adapted to be vertically placed into the first circular pile hole. S2B. Vertically place the prefabricated component into the first circular pile hole; S3B, Fix the top and bottom of the prefabricated component; S4B. Fill the space between the first circular pile hole and the precast component with crushed stone to the ground surface to form a second filling layer, so that the first circular pile hole and the precast component are stable. S5B, pour concrete into the closed space of the precast component to form the first filling layer, and then pull out the outer steel casing.

[0012] Preferably, step S1B is replaced by step S1B', which is: placing a steel casing at a preset position in the diaphragm wall node structure, and then constructing a second circular pile hole with the help of the steel casing. The outer diameter of the second circular pile hole is adapted to the outer diameter of the arc-shaped connection part of the precast component. A groove segment adapted to the node connection part of the precast component is milled at the preset position in the diaphragm wall node structure. The groove segment adapted to the node connection part of the precast component is connected to the second circular pile hole. Step S2B is replaced by step S2B', which is: aligning the node connection of the precast component with the groove of the node connection of the precast component, so that the precast component is vertically placed into the groove of the connected second circular pile hole and the node connection of the precast component. Step S4B is replaced by step S4B', which is: filling the space between the groove of the node connection part of the adapted precast component and the second circular pile hole and the precast component with crushed stone to the ground surface to form a second filling layer, so that the groove of the node connection part of the adapted precast component, the second circular pile hole and the precast component are stable. Step S5B is replaced by step S5B', which is: pouring concrete into the closed space of the precast component to form the first filling layer.

[0013] Preferably, in step S3B, the bottom of the precast component is fixed by pouring concrete to a height of 5m-8m into the bottom of the closed space of the precast component, and fixing the bottom of the precast component after the concrete has set. The method for fixing the top of the precast component is to level the top of the precast component using a ground leveling structure and then fix it.

[0014] In a third aspect, the present invention provides a method for constructing a diaphragm wall, comprising the following steps: S1. A rectangular diaphragm wall segment for the first phase of construction and a diaphragm wall node structure as described in any one of claims 1-4; S2. The construction steps for the second-phase rectangular diaphragm wall segment to be constructed between the first-phase rectangular diaphragm wall segment and the adjacent diaphragm wall node are as follows: When milling the groove of the second-phase rectangular diaphragm wall segment to be constructed, the second filling layer inside the groove structure needs to be milled away; then, the steel cage of the second-phase rectangular diaphragm wall segment is placed in the groove of the second-phase rectangular diaphragm wall segment, so that the steel cage overlaps the inside of the groove structure, with an overlap length of 0.35m-1m (related to the burial depth and verticality); then, concrete is poured to form the second-phase rectangular diaphragm wall segment, connecting the first-phase rectangular diaphragm wall segment and the adjacent diaphragm wall node structure. When the second filling layer is crushed stone and all the rectangular diaphragm wall segments to be connected in the node connection part of the diaphragm wall node wall structure are completed, grouting is injected into the remaining crushed stone in the second filling layer to form a seal, thus completing the construction of the diaphragm wall.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention provides a diaphragm wall node structure, which forms a precast component by connecting several node connection parts located on the same circumference and arc-shaped connection parts between circumferentially adjacent node connection parts. The node connection part is a groove-shaped structure facing the connection end of the rectangular diaphragm wall segment to be constructed in the second phase, capable of overlapping with the reinforcing cage of the rectangular diaphragm wall segment to be constructed in the second phase, ensuring shear resistance. The second filling material is crushed stone or undisturbed stratum. The second filling material fills the outside of the closed space, stabilizing the precast component and providing stable conditions for pouring the concrete of the first filling material, preventing the precast component from shifting. Furthermore, the second filling material can form a diaphragm wall structure with the undisturbed stratum to be constructed in the second phase. The milling balance condition of the rectangular diaphragm wall segment in the first phase; the arc-shaped facade structure connects the adjacent groove walls of the two circumferentially connected node connection parts, and all the arc-shaped connection parts and all the node connection parts are connected to form a closed space, which can provide a space for concrete pouring, meet the strength of the diaphragm wall node wall. Through the design of the diaphragm wall node wall structure, the conditions for the construction of the rectangular diaphragm wall segment to be constructed in the second phase can be provided, and the strength of the diaphragm wall after construction can be guaranteed to meet the requirements. Moreover, the prefabricated components are steel structures or reinforced concrete structures, which can be prefabricated in the factory, and are convenient to transport and not easily deformed, which can meet the construction requirements of the diaphragm wall node.

[0016] 2. This invention provides a construction method for a diaphragm wall node structure, in which prefabricated components are processed in the factory and then transported to the site for construction, which can meet the construction requirements of the diaphragm wall node.

[0017] 3. This invention provides a diaphragm wall construction method. By first constructing a first-stage rectangular diaphragm wall segment and a diaphragm wall node wall structure, and then constructing the second-stage rectangular diaphragm wall segment to be constructed between the first-stage rectangular diaphragm wall segment and the adjacent diaphragm wall node wall structure, the construction accuracy of the diaphragm wall can be improved. The construction of the diaphragm wall node wall structure does not require milling or the number of milling operations is greatly reduced, making the construction simpler. When milling the groove of the second-stage rectangular diaphragm wall segment to be constructed, the second filling layer inside the groove structure is milled off. Then, the reinforcing cage of the second-stage rectangular diaphragm wall segment is placed in the groove of the second-stage rectangular diaphragm wall segment, so that the reinforcing cage overlaps the inside of the groove structure with an overlap length of 0.35m-1m, thereby ensuring the shear resistance of the connection at the diaphragm wall node, making the diaphragm wall more stable and suitable for larger foundation pit construction. Attached Figure Description

[0018] Figure 1 A plan view of the precast steel components at the bottom of the arc-shaped facade of the Y-shaped diaphragm wall node structure; Figure 2 A plan view of the precast steel components at the bottom of the arc-shaped facade of the cross-shaped diaphragm wall node structure; Figure 3 for Figure 2 A schematic diagram of the precast steel components being pressed into the original stratum at predetermined positions; Figure 4 for Figure 2 A schematic diagram of the corresponding cross-shaped diaphragm wall node structure; Figure 5 for Figure 4 A schematic diagram of the plan of the rectangular diaphragm wall segment to be constructed in the second phase corresponding to the cross-shaped diaphragm wall node structure (the original strata are not shown). Figure 6 for Figure 5 A schematic diagram of the completed rectangular diaphragm wall segment after the construction of the second phase rectangular diaphragm wall segment (original strata not shown). Figure 7 for Figure 6 A schematic diagram of the completed second-phase rectangular diaphragm wall segments after the construction of other unfinished second-phase rectangular diaphragm wall segments (original strata not shown). Figure 8 A plan view of the precast steel components at the bottom of the vertical groove of a Y-shaped diaphragm wall node structure; Figure 9 A plan view of the precast steel components at the bottom of the vertical groove of a cross-shaped diaphragm wall node structure; Figure 10 A schematic diagram showing the plan of the first circular pile hole after the steel casing is placed at a predetermined location in the original stratum and constructed with the help of the steel casing; Figure 11For the purpose of decentralization Figure 9 A schematic diagram of the precast steel components after they have entered the first circular pile hole (the original strata are not shown). Figure 12 In order to be in Figure 11 A schematic diagram of a plan view showing a fixed bottom formed after 5m-8m of concrete is poured into the closed space of a precast steel component (original strata not shown). Figure 13 In order to be in Figure 12 A schematic diagram of the plan after the space between the first circular pile hole and the precast steel component is filled with crushed stone to the ground surface to form the second filling layer (the original strata are not shown). Figure 14 for Figure 9 A schematic diagram of the corresponding cross-shaped diaphragm wall node structure (original strata not shown). Figure 15 for Figure 14 A schematic diagram of the plan of the rectangular diaphragm wall segment to be constructed in the second phase corresponding to the cross-shaped diaphragm wall node structure (the original strata are not shown). Figure 16 for Figure 15 A schematic diagram of the completed rectangular diaphragm wall segment after the construction of the second phase rectangular diaphragm wall segment (original strata not shown). Figure 17 for Figure 16 A schematic diagram of the completed second-phase rectangular diaphragm wall segments after the construction of other unfinished second-phase rectangular diaphragm wall segments (original strata not shown). Figure 18 for Figure 17 A schematic diagram of the sealed plan formed by grouting the remaining second filling layer of crushed stone (the original strata are not shown). Figure 19 A plan view of a precast reinforced concrete component with a vertical groove in a cross-shaped diaphragm wall joint. Figure 20 For the purpose of decentralization Figure 19 A plan view of the precast reinforced concrete components after they have been inserted into the first circular pile hole (the original strata are not shown). Figure 21 In order to be in Figure 20 A schematic diagram of a precast reinforced concrete component in which concrete of a height of 5m-8m is poured into the closed space to form a fixed bottom (original strata not shown). Figure 22 for Figure 19 A schematic diagram of the corresponding cross-shaped diaphragm wall node structure (original strata not shown). Figure 23 for Figure 22A schematic diagram of the plan of the rectangular diaphragm wall segment to be constructed in the second phase corresponding to the cross-shaped diaphragm wall node structure (the original strata are not shown). Figure 24 for Figure 23 A schematic diagram of the completed rectangular diaphragm wall segment after the construction of the second phase rectangular diaphragm wall segment (original strata not shown). Figure 25 for Figure 24 A schematic diagram of the completed second-phase rectangular diaphragm wall segments after the construction of other unfinished second-phase rectangular diaphragm wall segments (original strata not shown). Figure 26 for Figure 25 A schematic diagram of the sealed plan formed by grouting the remaining second filling layer of crushed stone (the original strata are not shown). Figure 27 This is a schematic diagram of the diaphragm wall structure constructed through the diaphragm wall nodes of S1B-S5B. Figure 28 This is a schematic diagram of the diaphragm wall structure constructed through the diaphragm wall nodes of S1A-S3A.

[0019] The diagram is marked as follows: 0. Closed space; 1. Channel structure; 11. Flange steel plate; 2. Arc-shaped facade structure; 3. Reinforcing steel; 4. Steel casing; 41. First circular pile hole; 51. Crushed stone; 6. First filling layer; 71. Rectangular diaphragm wall segment to be constructed in the second phase; 72. Rectangular diaphragm wall segment already constructed in the second phase; 8. Grouting location; 9. Original stratum; 101. Y-shaped diaphragm wall node; 102. Cross-shaped diaphragm wall node; 103. X-shaped diaphragm wall node; 104. Straight diaphragm wall node. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to specific embodiments. However, this should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0021] Unless otherwise specified, the terms "upper," "lower," "left," "right," "center," "inner," and "outer," etc., used in the description of specific embodiments of the present invention to indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the product / equipment / device is usually placed during use. These terms are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, and for enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a particular device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on the present invention.

[0022] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," "parallel," and "coaxial" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, parallel, or coaxial. Slight tilt or deviation is permissible, as long as it does not affect the normal function of the relevant component. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be perfectly horizontal; a slight tilt is acceptable. "Coaxial" means that two components are arranged as coaxially as possible, allowing them to move coaxially or approximately coaxially when their relative positions change. Alternatively, it can be simplified to mean that the corresponding device / component / element, when arranged in "horizontal," "vertical," "suspended," "parallel," or "coaxial" directions, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. For example, the deviation in the "coaxial" direction is controlled within 0.2-1mm, preferably within 0.2-0.5mm. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the solution of the present invention.

[0023] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0024] Furthermore, in the description of the embodiments of the present invention, "several", "more than", and "a number of" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0025] Furthermore, in the description of the technical solution of this invention, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to connection methods commonly used in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0026] Example 1 Example 1 like Figures 1-26 As shown, a diaphragm wall node structure includes: prefabricated components, a first infill body, and a second infill body; The prefabricated components are steel structures or reinforced concrete structures, such as... Figure 1 and Figure 8 The precast components are steel precast components with Y-shaped diaphragm wall joints, such as... Figure 2 and Figure 9 The precast components are steel precast components with a cross-shaped diaphragm wall node structure, such as... Figure 19 The precast components are reinforced concrete precast components with a cross-shaped diaphragm wall node structure. The precast components include several node connections located on the same circumference and arc-shaped connections between adjacent circumferential node connections. The same circumference refers to a horizontal circumference. The number of node connections is the same as the number of rectangular diaphragm wall segments 71 to be constructed in the second phase. For example, if a Y-shaped diaphragm wall node requires three rectangular diaphragm wall segments 71 to be constructed in the second phase, then the number of node connections is three. Figure 1 and Figure 8 As shown; both the cross-shaped and X-shaped diaphragm wall nodes require four rectangular diaphragm wall segments 71 to be constructed in the second phase, thus the number of node connections is four, as follows. Figure 2 , Figure 9 and Figure 19 The planar structural forms of the locations where the Y-shaped diaphragm wall node 101, the cross-shaped diaphragm wall node 102, the X-shaped diaphragm wall node 103, and the straight diaphragm wall node 104 are set can be referenced. Figure 27 and Figure 28 As shown, the purpose is to connect other diaphragm wall segments to form an integral diaphragm wall structure. If the straight diaphragm wall is relatively long, a straight diaphragm wall node 104 can be arranged in the straight wall to reduce the construction length of the wall.

[0027] The node connection part is a groove-shaped structure 1 facing the connection end of the rectangular diaphragm wall segment 71 to be constructed in the second phase. The length direction of the groove-shaped structure 1 is vertical. The two groove walls of the groove-shaped structure 1 are vertical plates. The two groove walls of the groove-shaped structure 1 are arranged in parallel. The two groove walls of the groove-shaped structure 1 can be located on both sides of the connection end of the rectangular diaphragm wall segment 71 to be constructed in the second phase. The arc-shaped connection part is an arc-shaped facade structure 2. The arc-shaped facade structure 2 connects the adjacent groove walls of the two node connection parts that are circumferentially connected. All the arc-shaped connection parts and all the node connection parts are connected to form a closed space 0. The closed space 0 means that it is closed in the circumferential direction. The first filling material is concrete. The first filling material is filled into the closed space 0. By filling the closed space 0 of the precast component with concrete, a whole is formed, so that the strength can meet the requirements of the diaphragm wall node. The second filling material is crushed stone 51 or undisturbed stratum 9. The second filling material fills the outside of the closed space 0, and the outside of the second filling material is the undisturbed stratum 9. Specifically, when the undisturbed stratum 9 is a soil layer with low settlement resistance (such as soft soil, general clay, sandy soil, etc.), Figure 4 As shown, the second filler can be clay or sandy soil layers, meaning the precast components can be directly pressed into the undisturbed strata. When the undisturbed strata 9 are hard strata such as pebbles, gravelly sand, or moderately weathered rock, the second filler can be crushed stone 51. When the second filler is crushed stone 51, it is the backfill after the undisturbed soil of the strata 9 has been removed.

[0028] In an optional embodiment, the groove of the groove structure 1 is a vertical surface structure. This vertical surface design makes it easier and faster to mill the grooves of the rectangular diaphragm wall segment 71 to be constructed in the second phase using a diaphragm wall milling machine. When the precast component is a steel structure, such as Figure 8 and Figure 9 As shown, the arc-shaped facade structure 2 connects the outer sides of the groove openings of adjacent groove walls of two circumferentially connected node connection parts, forming a closed space 0. Within this closed space 0, welded reinforcing steel bars 3 reinforce the node connection parts to prevent deformation. When the precast component is a reinforced concrete structure, such as... Figure 19 As shown, the outer side of the arc-shaped facade structure 2 is connected to the outer side of the groove of the adjacent groove wall of the two circumferentially connected node connection parts, and the inner side of all the arc-shaped facade structures 2 and the inner side of all the node connection parts form a circular closed space 0, that is, a circular hole.

[0029] In an optional embodiment, the bottom of the trough structure 1 is an arc-shaped facade structure 2, and the prefabricated component is a steel structure. The bottoms of all the trough structures 1 are connected to all the arc-shaped connecting parts to form a steel pipe, allowing the prefabricated component to be processed by first forming the steel pipe, and then welding flange steel plates 11 to the outside of the steel pipe to form the trough wall of the trough structure 1. Figure 1 and Figure 2 As shown, the processing is simpler. However, because the bottom of its trough structure 1 is an arc-shaped vertical structure 2, the angle between it and the two sides of the trough wall is small. When the diaphragm wall milling machine is used to mill the trough segment 71 of the rectangular diaphragm wall to be constructed in the second phase, it is impossible to mill to the angle between the bottom of the trough and the two sides of the trough wall. Therefore, it is necessary to clean it with a high-pressure water gun.

[0030] In an optional embodiment, when the second filler is crushed stone 51, since it is not squeezed into the original stratum 9, the precast component can also be provided with a bottom sealing plate. The bottom sealing plate is connected to the bottom of the closed space 0 to form a bottom seal. By providing a bottom sealing plate, the poured concrete can be prevented from leaking down from the bottom of the closed space, thereby reducing the concrete pouring requirements and better ensuring the pouring quality of the first filler, thus improving the structural stability of the diaphragm wall node.

[0031] This embodiment describes a diaphragm wall node structure, which forms a precast component by connecting several node connection parts located on the same circumference and arc-shaped connection parts between adjacent circumferential node connection parts. The node connection part is a groove-shaped structure 1 facing the connection end of the rectangular diaphragm wall segment 71 to be constructed in the second phase, capable of overlapping with the reinforcing cage of the connection end of the rectangular diaphragm wall segment 71 to ensure shear resistance. The second filling body is crushed stone 51 or a soil layer with low settlement resistance (such as soft soil, general clay, sandy soil, etc.). The second filling body fills the outside of the closed space 0, which can stabilize the precast component, provide stable conditions for pouring the concrete of the first filling body, prevent the precast component from shifting, and the second filling body can... The original stratum 9 forms the milling balance condition for the rectangular diaphragm wall segment 71 to be constructed in the second phase; the arc-shaped facade structure 2 connects the adjacent groove walls of the two circumferentially connected node connection parts, and all the arc-shaped connection parts and all the node connection parts are connected to form a closed space 0, which can provide a space for concrete pouring and meet the strength of the diaphragm wall node wall. Through the design of the diaphragm wall node wall structure, the conditions for the construction of the rectangular diaphragm wall segment 71 to be constructed in the second phase can be provided, and the strength of the diaphragm wall after construction can be guaranteed to meet the requirements. Moreover, the prefabricated components are steel structures or reinforced concrete structures, which can be prefabricated in the factory, and are relatively convenient to transport and not easily deformed, which can meet the construction requirements of the diaphragm wall node.

[0032] Example 2 A construction method for a diaphragm wall node structure, used in the diaphragm wall node structure described in Example 1, involves prefabricating components in the factory and transporting them to the site for construction. Compared to transporting steel cages after they are tied in the factory, this method is less prone to deformation during transportation and can meet the construction requirements of the diaphragm wall node.

[0033] The following describes several construction methods: like Figures 2-4 As shown, when the local diaphragm wall node structure is located in a soil layer with low settlement resistance, the precast components are steel structures, the bottom of the trough structure 1 is an arc-shaped facade structure 2, and the bottom of all the trough structures 1 is connected to all the arc-shaped connecting parts to form a steel pipe, the construction steps are as follows: S1A, such as Figure 3 As shown, at the preset position of the diaphragm wall node wall structure, the precast component is completely pressed from the ground surface into the original stratum; the equipment for pressing the precast component can be a vibratory hammer, which is existing technology; the precast component is a steel pipe with flanged steel plate 11, and if the sinking encounters resistance, soil can be extracted by rotary excavation inside the steel pipe. S2A. Excavate the soil from top to bottom and clean the hole within the closed space 0 of the precast component; the excavation method is existing technology. S3A. Place a circular steel cage inside the closed space 0, and underwater pour concrete inside the closed space 0 of the precast component to form the first filling layer 6, as shown. Figure 4 As shown. Since this steel cage is a circular steel cage, it is relatively simple to process and can be processed on-site.

[0034] This method is suitable for construction in undisturbed strata that are easy to penetrate, such as soft soil, general cohesive soil, or sandy soil. Figure 28 As shown, because the precast components can be completely pressed into the original stratum from the ground surface, and subsequent excavation only requires excavating the soil within the enclosed space of the precast components, the excavation volume is small. Moreover, the excavation process can be supported by the precast components, utilizing the arch effect of the arc-shaped connection of the precast components for support, making the excavation process safer. Furthermore, with the balanced support of the original stratum on the outside as a second infill body, the verticality of the precast components can be guaranteed, resulting in higher construction accuracy. This provides a better benchmark for the subsequent construction of the second-phase rectangular diaphragm wall segments, ensuring the smooth progress of the second-phase rectangular diaphragm wall segment construction.

[0035] When the local diaphragm wall node is located in a soil layer with low settlement resistance or a hard stratum, such as Figure 27 As shown, the following construction method can also be used, with the following construction steps: S1B, such as Figure 10 As shown, a steel casing 4 is placed at a preset position in the diaphragm wall node structure, and then the first circular pile hole 41 is constructed with the help of the steel casing 4. The first circular pile hole 41 is constructed with mud wall protection according to the drilling pile method, and the first circular pile hole 41 is cleaned. The first circular pile hole 41 is a vertical hole, so that the precast component can be adapted to be placed vertically into the first circular pile hole 41. That is, the height of the first circular pile hole 41 is adapted to the height of the precast component, and the dimensions of its horizontal cross section can allow the precast component to be placed vertically. For example, the diameter of the first circular pile hole 41 is not less than 10cm larger than the precast component. S2B, such as Figure 11 and Figure 20 As shown, the prefabricated component is vertically placed into the first circular pile hole 41; the lowering process can be carried out by a crane. S3B, Fix the top and bottom of the prefabricated component; In optional implementations, such as Figure 12 and Figure 21As shown, the method for fixing the bottom of the precast component is as follows: pour concrete to a height of 5m-8m into the bottom of the closed space 0 of the precast component, and then embed the bottom of the precast component after the concrete has set; in this case, the bottom of the closed space 0 is sealed by a bottom sealing plate; pouring concrete to a height of 5m-8m can act as a counterweight to ensure that the center of gravity is at the bottom, thereby fixing the bottom of the precast component and reducing the disturbance of the stratum to the precast component; compared with other fixing methods, this method not only fixes the bottom of the precast component, but also realizes the pouring of part of the first filling body, thereby reducing the subsequent pouring construction time, and the verticality of the precast component will not be affected during the pouring of concrete to a height of 5m-8m, and the pouring height should not be less than 5m to avoid weak fixing ability of the bottom of the precast component, nor more than 8m to avoid the vibration process affecting the verticality of the precast component. The method for fixing the top of the precast component is as follows: the top of the precast component is leveled and then fixed using a ground leveling structure. The ground leveling structure is an existing leveling and fixing structure that can adjust the verticality of vertical components such as precast components on the ground surface and fix them. By fixing the top and bottom of the precast component, the verticality of the precast component can be guaranteed, thereby ensuring the overall molding quality after the concrete is poured later. In this method, the opening is positioned primarily by fixing the top of the precast component to ensure its verticality. However, for ease of viewing, the method of fixing the top of the precast component is not specified. Figure 12 and Figure 21 Shown; S4B, such as Figure 13 As shown, crushed stone 51 is filled into the space between the first circular pile hole 41 and the precast component to the ground surface to form a second filling layer. Due to the previous fixation of the top and bottom of the precast component, the verticality of the precast component is less affected or even has no effect when the crushed stone 51 is filled. Moreover, after the crushed stone 51 is filled, the support of the crushed stone 51 for the precast component can further ensure the verticality of the precast component, making the first circular pile hole 41 and the precast component more stable. S5B, such as Figure 14 and Figure 22 As shown, concrete is poured into the closed space 0 of the precast component to form the first filling layer 6 (i.e., reaching the design elevation), and then the outer steel casing 4 is pulled out. Due to the previous guarantee of the verticality of the precast component, when the concrete is poured to form the first filling layer 6, the impact of the concrete vibration on the precast component can be offset by the top and bottom fixing of the precast component and the support of the outer crushed stone 51. Therefore, the construction of the first filling layer 6 does not affect the verticality of the precast component, thus ensuring the construction quality. In an optional implementation, step S1B is replaced with step S1B', step S2B is replaced with step S2B', step S4B is replaced with step S4B', and step S5B is replaced with step S5B'. The specific construction steps are as follows: S1B', A second circular pile hole is formed at a preset position in the diaphragm wall node structure. The outer diameter of the second circular pile hole is adapted to the outer diameter of the arc-shaped connection part of the precast component. That is, the size of the second circular pile hole is smaller than the size of the first circular pile hole 41, but slightly larger than the outer diameter of the arc-shaped connection part, so that the precast component can be lowered normally. A groove segment adapted to the node connection part of the precast component is milled at the preset position in the diaphragm wall node structure. The groove segment adapted to the node connection part of the precast component is connected to the second circular pile hole. The preferred construction method involves first milling a groove segment at a predetermined location in the diaphragm wall node structure to accommodate the joint connection of the precast component. Then, a second circular pile hole is formed at the same predetermined location in the diaphragm wall node structure, ensuring that the outer diameter of the second circular pile hole matches the outer diameter of the arc-shaped connection of the precast component. This sequence facilitates the construction of the second circular pile hole and does not affect the balance of the groove milling process. The milling can be performed using equipment such as a diaphragm wall milling machine; the milling method is existing technology.

[0036] S2B' Align the node connection of the precast component with the groove of the node connection of the precast component, so that the precast component is vertically placed into the groove of the connected second circular pile hole and the node connection of the precast component. S3B. Fix the top and bottom of the precast component; the fixing method can be the same as described above. S4B', fill the space between the groove of the node connection of the precast component and the groove structure 1 of the precast component, as well as between the second circular pile hole and the arc-shaped connection of the precast component, with crushed stone 51 to the ground surface to form a second filling layer, so that the groove of the node connection of the precast component, the second circular pile hole and the precast component are stable; due to the small excavation area, the backfill area is also small, so that compared with the first circular pile hole 41, the backfilling work is lower and the backfilling is simpler. S5B', pour concrete into the closed space 0 of the precast component to form the first filling layer 6.

[0037] Example 3 This embodiment provides a method for constructing a diaphragm wall, including the following steps: S1. The construction of the first-phase rectangular diaphragm wall segment and the diaphragm wall node wall structure described in Example 1 can provide precise positioning for the construction of the second-phase rectangular diaphragm wall segment 71 to be constructed between the first-phase rectangular diaphragm wall segment and the adjacent diaphragm wall node wall structure, enabling higher precision in diaphragm wall construction; such as Figure 5 , Figure 15and Figure 23 As shown, the first-phase rectangular diaphragm wall segment is not displayed; the main focus is on the construction positioning of the second-phase rectangular diaphragm wall segment 71 to be constructed between the diaphragm wall node structures. The construction method of the diaphragm wall node wall structure described in Example 1 can be adopted in Example 2. The construction of the first-phase rectangular diaphragm wall segment can be carried out by the conventional reinforced concrete diaphragm wall milling method. In an optional implementation, the diaphragm wall node wall structure described in Example 1 can be constructed first. After the diaphragm wall node wall structure is constructed, it can serve as a positioning for the construction of the first-phase rectangular diaphragm wall segment corresponding to the diaphragm wall node wall, making the construction of the first-phase rectangular diaphragm wall segment more precise. S2. The construction steps for the second-phase rectangular diaphragm wall segment 71, which is to be constructed between the first-phase rectangular diaphragm wall segment and the adjacent diaphragm wall node, are as follows: Milling the groove segment of the second-phase rectangular diaphragm wall segment 71 to be constructed requires milling away the second infill layer within the groove structure 1; then, placing the reinforcing cage of the second-phase rectangular diaphragm wall segment into the groove segment, so that the reinforcing cage overlaps the inner side of the groove structure 1 with an overlap length of 0.35m-1m, and then pouring concrete to form the second-phase rectangular diaphragm wall segment, connecting the first-phase rectangular diaphragm wall segment and the adjacent diaphragm wall node structure; such as Figure 6 , Figure 7 , Figure 16 , Figure 17 , Figure 24 and Figure 25 This is to form the already constructed rectangular diaphragm wall segment 72 after the construction of the second-phase rectangular diaphragm wall segment 71, which is to be constructed later. Figure 7 , Figure 17 and Figure 25 The diagram shows the connection between the cross-shaped diaphragm wall node 104 and the straight diaphragm wall node 102 via the already constructed second-phase rectangular diaphragm wall segment 72. When the second filling layer is crushed stone 51 and all the rectangular diaphragm wall segments 71 to be connected in the node connection part of the diaphragm wall node wall structure are completed, grout is injected into the remaining crushed stone 51 in the second filling layer to form a seal, such as... Figure 18 and Figure 26 As shown, grouting section 8 is illustrated.

[0038] The construction of diaphragm walls is completed in the above manner. The shear resistance of the diaphragm wall joints can be guaranteed by the overlapping, which makes the diaphragm wall more stable and can be used for larger foundation pit construction.

[0039] This construction method for diaphragm walls eliminates the need for milling at the joints, or significantly reduces the number of milling operations. This avoids the high-cost operation of repeatedly milling away 20-30cm of concrete at the joints of conventional cast-in-place diaphragm walls, making construction simpler and resulting in better overall quality and higher stability of the diaphragm walls after construction.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A diaphragm wall joint wall construction characterised in that, The utility model relates to a kind of prefabricated components, and the prefabricated components are steel structure or reinforced concrete structure, the prefabricated components include several node connecting parts on the same circumference and the arc connecting part between circumferentially adjacent node connecting parts, the node connecting part is the slot structure (1) connected to the connecting end of the to-be-constructed secondary rectangular diaphragm wall section (71), two slot walls of the slot structure (1) are arranged in parallel, two slot walls of the slot structure (1) can be arranged on both sides of the connecting end of the to-be-constructed secondary rectangular diaphragm wall section (71), the arc connecting part is the arc facade structure (2) connected between the adjacent slot walls of the two circumferentially connected node connecting parts, all the arc connecting parts and all the node connecting parts are connected to form closed space (0);First filling body, the first filling body is concrete, and the first filling body is filled in the closed space (0);Second filling body, the second filling body is the original stratum (9) outside, and the second filling body is gravel (51) or the original stratum (9), and the second filling body is filled outside the closed space (0). The recess of the slot structure (1) is a vertical surface structure; When the prefabricated component is a steel structure, the arc facade structure (2) is connected to the slot opening outside of the adjacent slot walls of the two circumferentially connected node connecting parts, and the closed space (0) is reinforced by welding reinforcing steel bars (3) inside. When the prefabricated component is a reinforced concrete structure, the arc facade structure (2) is connected to the slot opening outside of the adjacent slot walls of the two circumferentially connected node connecting parts outside, and the closed space (0) is formed in a circular shape by the inside of all the arc facade structures (2) and the inside of all the node connecting parts.

2. A diaphragm wall joint wall construction according to claim 1, wherein, The slot bottom of the slot structure (1) is an arc facade structure (2), the prefabricated component is a steel structure, and all the slot bottoms of the slot structure (1) are connected to all the arc connecting parts to form a steel pipe. When the second filling body is gravel (51), the prefabricated component further comprises a bottom sealing plate connected to the bottom of the closed space (0) to form a bottom seal. The utility model is used for constructing the diaphragm wall node wall structure of any one of claims 1-4, and the prefabricated component is transported to the construction site after being processed in the factory.

3. A diaphragm wall joint wall construction according to claim 1, wherein, When the original stratum where the diaphragm wall node wall structure is located is a soil layer with small sinking resistance, the prefabricated component is a steel structure, the slot bottom of the slot structure (1) is an arc facade structure (2), and all the slot bottoms of the slot structure (1) are connected to all the arc connecting parts to form a steel pipe, the construction steps are as follows:

4. A diaphragm wall joint wall construction according to any one of claims 1 to 3, wherein, S1A, the prefabricated component is completely pressed into the original stratum from the ground surface at the preset position of the diaphragm wall node wall structure; 5. A method of constructing a diaphragm wall joint wall construction, characterised in that, S2A, the soil body is excavated from top to bottom in the closed space (0) of the prefabricated component, and the hole is cleaned; 6. A method of constructing a diaphragm wall node wall construction according to claim 5, wherein, S3A, a circular reinforcement cage is placed in the closed space (0), and concrete is poured in the closed space (0) of the prefabricated component to form a first filling layer (6). The construction steps are as follows: ​ ​ 7. A method of constructing a diaphragm wall node wall construction according to claim 5, wherein, ​ S1B, place the steel casing (4) at the preset position of the diaphragm wall joint wall structure, then construct the first circular pile hole (41) by means of the steel casing (4), and clean the first circular pile hole (41) to enable the prefabricated component to be vertically placed in the first circular pile hole (41); S2B, vertically place the prefabricated component in the first circular pile hole (41); S3B, fix the top and bottom of the prefabricated component; S4B, fill the space between the first circular pile hole (41) and the prefabricated component with gravel (51) to the ground surface to form a second filling layer, so that the first circular pile hole (41) and the prefabricated component are stable; S5B, pour concrete into the closed space (0) of the prefabricated component to form a first filling layer (6), and then pull out the peripheral steel casing (4).

8. A method of constructing a diaphragm wall node wall construction according to claim 7, wherein, Step S1B is replaced by step S1B', which is: placing the steel casing (4) at the preset position of the diaphragm wall joint wall structure, then constructing a second circular pile hole by means of the steel casing (4), the outer diameter of the second circular pile hole being adapted to the outer diameter of the arc-shaped connecting part of the prefabricated component; and milling a groove section adapted to the node connecting part of the prefabricated component at the preset position of the diaphragm wall joint wall structure; wherein the groove section adapted to the node connecting part of the prefabricated component is in communication with the second circular pile hole; Step S2B is replaced by step S2B', which is: aligning the node connecting part of the prefabricated component with the groove section adapted to the node connecting part of the prefabricated component, so that the prefabricated component is vertically placed in the second circular pile hole and the groove section adapted to the node connecting part of the prefabricated component in communication; Step S4B is replaced by step S4B', which is: filling the space between the groove section adapted to the node connecting part of the prefabricated component, the second circular pile hole and the prefabricated component with gravel (51) to the ground surface to form a second filling layer, so that the groove section adapted to the node connecting part of the prefabricated component, the second circular pile hole and the prefabricated component are stable; Step S5B is replaced by step S5B', which is: pouring concrete into the closed space (0) of the prefabricated component to form a first filling layer (6).

9. A method of constructing a diaphragm wall joint wall construction according to any one of claims 7-8, characterised in that, In step S3B, the way to fix the bottom of the prefabricated component is to pour 5-8m high concrete into the bottom of the closed space (0) of the prefabricated component, and then fix the bottom of the prefabricated component after the concrete is set; The way to fix the top of the prefabricated component is to level the top of the prefabricated component through the ground leveling structure and then fix it.

10. A diaphragm wall construction method characterized by, The method comprises the following steps: S1, constructing a first-stage rectangular diaphragm wall segment and a diaphragm wall joint wall structure according to any one of claims 1-4; S2, constructing a to-be-constructed second-stage rectangular diaphragm wall segment (71) between the first-stage rectangular diaphragm wall segment and the adjacent diaphragm wall joint wall structure, and the steps are as follows: The second filling layer inside the trough structure (1) needs to be milled out before the second phase rectangular diaphragm wall segment (71) is constructed. Then, the steel cage of the second phase rectangular diaphragm wall segment is placed in the trough of the second phase rectangular diaphragm wall segment so that the steel cage overlaps the inside of the trough structure (1) with an overlap length of 0.5m-1m. Then, concrete is poured to form the second phase rectangular diaphragm wall segment, which connects the first phase rectangular diaphragm wall segment and the adjacent diaphragm wall node wall structure. When the second filling layer is crushed stone (51) and all the rectangular diaphragm wall segments (71) to be connected in the node connection part of the diaphragm wall node wall structure are completed, grouting is injected into the remaining crushed stone (51) in the second filling layer to form a seal, and the construction of the diaphragm wall is completed.

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