Support integrated structure for underground structure and construction method of support integrated structure

Abstract

The invention discloses a supporting integrated structure for an underground structure and a construction method of the supporting integrated structure, and relates to the technical field of underground structure construction.The supporting integrated structure comprises a plurality of sheet pile supports, movable formworks and supporting connecting pieces; the sides, close to each other, of the sheet pile supports are connected in a clamped mode through butt-joint buckles to form an integral structure with closed ends which are spaced in the opposite directions, and the integral structure is inserted into the outer side of a foundation pit. The movable template is vertically arranged on the other side of the integral structure; and the support connecting piece is horizontally supported and connected between the sheet pile support and the movable template. According to the construction method, the sheet pile support and the movable formwork are safely connected through the adjustable connecting piece, so that the structural outer formwork and the steel sheet pile support which are stressed respectively tend to integrally and jointly resist the soil pressure outside the foundation pit and the concrete pouring pressure inside the foundation pit, and the stability of the support integrated structure is improved; and the excavation area of the foundation pit is reduced to a certain extent, and the construction efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of underground structure construction, and more particularly, to an integrated support structure for underground structures and a construction method thereof. Background Art

[0002] The efficient and high-quality construction of underground structures plays an important role in ensuring the stability of buildings, extending their service life, protecting the environment, enhancing social benefits, and promoting economic development.

[0003] During the construction of underground structures, the formwork engineering and the foundation pit support engineering are particularly important. Due to their light weight, firmness, and reusability, steel sheet piles play an important reinforcement role in many engineering fields such as roads, bridges, and water conservancy, improving the stability and safety of engineering structures, and are widely used in the support of foundation pit engineering.

[0004] Currently, the main steps of most underground structure construction are: foundation pit excavation and support, steel bar binding, formwork installation, and concrete pouring. Among them, steel bar binding and formwork installation are mostly carried out inside the foundation pit. To provide sufficient working space for steel bar binding and formwork installation, the excavation area of the foundation pit often needs to be increased. However, to reduce the earthwork excavation volume, the working space is reduced, resulting in a decrease in construction efficiency. In actual construction, it is difficult to balance the contradiction between the working space and the excavation area, and it is very easy to cause waste of resources and increase in costs. Summary of the Invention

[0005] In view of this, in order to solve the technical problems in the prior art such as the difficulty in balancing the working space and the excavation area, and the insufficient stability of the support structure, the present invention aims to provide an integrated support structure for underground structures and a construction method thereof, so as to connect the external formwork of the underground structure and the steel sheet pile support of the foundation pit into a whole, enabling them to jointly resist the earth pressure outside the foundation pit and the concrete pouring pressure inside the foundation pit, improving the stability of the support structure, simplifying the construction process, reducing the construction time, and lowering the construction cost.

[0006] To solve the above problems, the first object of the present invention is to provide an integrated support structure for underground structures, comprising:

[0007] A plurality of sheet pile braces, the sides of the sheet pile braces close to each other are connected by docking buckles to form an integral structure with mutually opposite and spaced closed ends, and the integral structure is vertically inserted outside the foundation pit;

[0008] A movable formwork, vertically arranged on the other side of the foundation pit relative to the integral structure;

[0009] A plurality of support connectors, correspondingly supported and connected between the sheet pile braces and the movable formwork.

[0010] Preferably, the movable formwork includes a formwork body, two linear guide rails horizontally arranged on the upper edge and the lower edge ribs of the formwork body, several guide blocks slidably mounted on the linear guide rails, and vertical cylindrical steel ribs connecting the guide blocks at corresponding upper and lower positions. A plurality of uniformly distributed horizontal and vertical stiffeners are arranged on the formwork body.

[0011] Preferably, the support connecting member includes a first connecting bolt connected to the movable formwork, a second connecting bolt connected to the sheet pile strut, and a nut sleeve connected between the first connecting bolt and the second connecting bolt. One end of the nut sleeve is threadedly connected to the first connecting bolt, and the other end is threadedly connected to the second connecting bolt.

[0012] Preferably, an annular hole is provided at the center of the side of the closed end facing the foundation pit, and a limiting device is provided at the center of the side of the closed end facing away from the foundation pit. The limiting device is fixedly connected to the end of the second connecting bolt far from the nut sleeve.

[0013] Preferably, an annular support is provided at the end of the first connecting bolt close to the movable formwork, and the annular support is snap-connected to the vertical cylindrical steel rib.

[0014] Preferably, a buffer disc and a buckle are provided at the end of the second connecting bolt close to the sheet pile strut. The buffer disc is adapted to be limited within the limiting device, and the buckle is adapted to be inserted into the annular hole.

[0015] Preferably, a rotary wrench is provided on the outer circumference of the nut sleeve.

[0016] Preferably, the cross-sectional profile of the closed end is a U-shaped single plate, and the U-shaped single plate is made of channel steel.

[0017] Preferably, the buckle is made of plastic.

[0018] The second object of the present invention is to provide a construction method for the integrated supporting structure for underground structures according to the above, and the construction method includes the steps:

[0019] Step S 100 : Fabricate the sheet pile strut;

[0020] Process annular holes at fixed intervals on the front central axis of the steel sheet pile, and weld the limiting device around the annular holes;

[0021] Step S 200 : Insert the sheet pile strut in place;

[0022] According to the structural dimensions of the underground structure and the adjustable range of the support connectors, determine the excavation area of the foundation pit, and after on-site measurement and setting out, carry out the pile driving steps of the sheet pile support, so that the sheet pile support can form the side wall of the foundation pit;

[0023] Step S 300 : Processing and installation of support connectors;

[0024] According to the design dimensions of the support connectors, process the first connecting bolt, the second connecting bolt and the nut sleeve in the factory, and snap the buckle of the second connecting bolt into the annular hole of the sheet pile support, and embed the buffer disc into the limiting device, so as to realize the connection and fixation of the support connectors on the sheet pile support;

[0025] After measuring and setting out according to the dimensions of the underground structure, thread the first connecting bolt and the nut sleeve, and adjust the support length of the support connectors to meet the installation requirements of the movable formwork;

[0026] Step S 400 : Design and processing of the movable formwork;

[0027] Design and process the movable formwork according to the dimensions of the underground structure, and weld the linear guide rails at the upper and lower edge ribs of the movable formwork, and snap the guide blocks onto the linear guide rails;

[0028] Step S 500 : Installation of the movable formwork;

[0029] Insert the vertical columnar steel ribs of the movable formwork into the annular holes of the annular support from top to bottom to complete the installation of the movable formwork.

[0030] Step S 600 : Hoisting of the steel cage of the underground structure and concrete pouring;

[0031] Hoist the steel cage of the underground structure tied outside the site into the integrated structure, and pour concrete after completing the positioning and fixing;

[0032] Step S 700 : Demolition of the integrated support structure;

[0033] First, remove the connection between the buckle and the annular hole, so as to remove all the support connectors; then remove the movable formwork; after the foundation pit is backfilled, pull out all the sheet pile supports.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. The support integrated structure in the present application is composed of a number of sheet pile supports, a movable formwork and a number of support connectors, wherein the side of the sheet pile supports close to each other is connected by a docking buckle to form an integral structure with mutually reverse spaced closed ends, and the integral structure is vertically inserted on the outside of the foundation pit. This docking buckle connection method allows the sheet pile supports to be tightly combined to form a whole. The design of the reverse spaced closed end allows the overall structure to better disperse stress when subjected to force. In this way, the overall structure vertically inserted on the outside of the foundation pit can effectively block the lateral pressure of the soil and prevent the foundation pit from collapsing. During the foundation pit construction process, the movable formwork can be adjusted and moved according to the construction progress and needs, providing formwork support for subsequent construction such as concrete pouring. In addition, the movable formwork can be flexibly adjusted according to the shape and size of the foundation pit to ensure that the formwork fits the foundation pit wall better and improve the quality of concrete pouring. The support connector is horizontally supported and connected between the sheet pile support and the movable formwork to form an integral structure that can effectively resist lateral force and shear force. During the foundation pit construction process, the lateral pressure exerted by the soil on the sheet pile support will be transmitted to the movable formwork through the support connector, and then the movable formwork will disperse the force to the entire structure, thereby avoiding deformation or damage of the structure due to excessive local force. The setting of horizontal support connectors can increase the rigidity of the structure, reduce deformation and improve overall stability.

[0036] 2. The movable formwork can be flexibly adjusted according to the construction progress, pit shape and size to ensure a higher fit with the pit wall. This flexibility enables the construction process to quickly adapt to different engineering scenarios and reduce the time and materials wasted due to adjusting the formwork. The structure can adapt to pits of different shapes and sizes through the connection of sheet pile supports and the adjustment of the movable formwork. Whether it is a regular rectangular pit or an irregular pit, it can be adapted by adjusting the number and position of sheet pile supports.

[0037] 3. The integrated design of the support structure of movable formwork and sheet pile support reduces construction steps and material waste, improves the utilization rate of equipment and materials, and enables the structure to be widely used in the construction of various underground structures such as subway stations, underground parking lots, and deep foundation pits; through the connection of horizontal support connectors, the stability of the integrated structure of steel sheet pile support is significantly enhanced, which can effectively resist the lateral soil pressure of the foundation pit and ensure construction safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic diagram of a three-dimensional structure of an integrated support structure for underground structures in an embodiment of the present invention;

[0039] Figure 2 It is a schematic diagram of a top view of the integrated support structure for underground structures in an embodiment of the present invention;

[0040] Figure 3 This is a schematic structural diagram of the integrated structure of a single steel sheet pile support in an embodiment of the present invention;

[0041] Figure 4 This is a three-dimensional structural diagram of a movable formwork in an embodiment of the present invention;

[0042] Figure 5 This is a three-dimensional structural diagram of a support connecting member in an embodiment of the present invention;

[0043] Figure 6 This is a schematic flow diagram of the construction method of the integrated structure for the support of underground structures in an embodiment of the present invention.

[0044] Explanation of reference numerals:

[0045] 1 - Sheet pile brace; 11 - Docking buckle; 12 - Annular hole; 13 - Limiting device;

[0046] 2 - Movable formwork; 21 - Linear guide rail; 211 - Fixed hole; 22 - Guide block; 23 - Vertical cylindrical steel rib;

[0047] 3 - Support connecting member; 31 - First connecting bolt; 311 - Annular support; 32 - Second connecting bolt; 321 - Buffer disc; 322 - Buckle; 33 - Nut sleeve; 331 - Rotating wrench. Detailed implementation manners

[0048] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0049] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can also be the communication inside two components. It can be a wireless connection or a wired connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0050] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0051] Please refer to Figures 1-5As shown in the figure, an integrated support structure for underground structures is provided in an embodiment of the present invention. The integrated support structure includes a plurality of sheet pile braces 1, a movable formwork 2, and a plurality of support connectors 3, where:

[0052] On one side where the plurality of sheet pile braces 1 are close to each other, they are connected by docking buckles 11 to form an integral structure with mutually reverse spaced closed ends, and the integral structure is vertically inserted outside the foundation pit. This connection method of the docking buckles 11 enables the sheet pile braces 1 to be closely combined to form a whole. Its connection method is similar to the mortise and tenon structure in building structures. Through mechanical biting, the shear resistance and bending resistance of the whole are enhanced. The setting of the reverse spaced closed ends enables the integral structure to better disperse stress when stressed. For example, when the soil outside the foundation pit exerts pressure on the sheet pile braces 1, this structure can evenly disperse the force to each sheet pile brace 1, avoiding structural damage caused by excessive local stress. The integral structure inserted outside the foundation pit is equivalent to forming a solid "fence" around the foundation pit, which can effectively block the lateral pressure of the soil and prevent the foundation pit from collapsing.

[0053] The movable formwork 2 is vertically arranged on the other side of the foundation pit relative to the integral structure. During the construction process of the foundation pit, the movable formwork 2 can be adjusted and moved according to the construction progress and requirements, providing formwork support for subsequent construction such as concrete pouring. In addition, the movable formwork 2 can be flexibly adjusted according to the shape and size of the foundation pit to ensure a higher degree of fit between the formwork and the foundation pit wall, improving the quality of concrete pouring.

[0054] The support connectors 3 are horizontally supported and connected between the sheet pile braces 1 and the movable formwork 2 to form an integral structure. This connection method is similar to the horizontal support in the frame structure and can effectively resist lateral force and shear force. During the construction process of the foundation pit, the lateral pressure exerted by the soil on the sheet pile braces 1 will be transmitted to the movable formwork 2 through the support connectors 3, and then the movable formwork 2 will disperse the force to the entire structure, thus avoiding structural deformation or damage caused by excessive local stress. The setting of the horizontal support connectors 3 can increase the stiffness of the structure, reduce deformation, and improve the overall stability.

[0055] Thus, the sheet pile braces 1 are tightly combined through docking buckles 11 to form an integral structure, enabling the sheet pile braces 1 to work better together when stressed and improving the bearing capacity of the overall structure; the movable formwork 2 can be flexibly adjusted according to the construction progress, the shape and size of the foundation pit, ensuring a higher degree of fit with the foundation pit wall. This flexibility allows for quick adaptation to different engineering scenarios during construction, reducing the time and materials wasted due to formwork adjustment. Through the connection of the sheet pile braces 1 and the adjustment of the movable formwork 2, this structure can adapt to foundation pits of different shapes and sizes. Whether it is a regular rectangular foundation pit or an irregularly shaped foundation pit, it can be adapted by adjusting the quantity and position of the sheet pile braces 1; the integrated design of the movable formwork 2 and the supporting structure of the sheet pile braces 1 reduces construction steps and material waste, improving the utilization rate of equipment and materials, enabling this structure to be widely used in the construction of various underground structures such as subway stations, underground parking lots, and deep foundation pits; through the connection of the horizontal support connectors 3, the stability of the integrated supporting structure is significantly enhanced, capable of effectively resisting the lateral earth pressure of the foundation pit and ensuring construction safety.

[0056] Specifically, please refer to Figure 3 、 4 As shown, the movable formwork 2 includes a formwork body, two linear guide rails 21, several guide blocks 22, and vertical columnar steel ribs 23, where:

[0057] The two linear guide rails 21 are respectively horizontally arranged at the upper edge and the lower edge rib positions of the formwork body. Several guide blocks 22 are suitable for slidingly mounting on the linear guide rails 21. Each vertical columnar steel rib 23 is connected between the guide blocks 22 at the corresponding upper and lower positions. Several uniformly distributed horizontal and vertical stiffeners are arranged on the formwork body. After all the formwork bodies are installed in place, several fixing holes 211 provided on the linear guide rails 21 corresponding to the vertical stiffeners of the movable formwork 2 can be used to fix the guide blocks 22, thereby achieving the purpose of fixing the movable formwork 2.

[0058] Specifically in the technical solution of the present invention, the two linear guide rails 21 are respectively arranged at the upper edge and the lower edge rib positions of the formwork body, used to guide and support the sliding of the guide blocks 22, providing an accurate guiding path for the adjustment of the movable formwork 2, enabling the guide blocks 22 to slide along the linear guide rails 21, thereby realizing the flexible adjustment of the formwork in the horizontal direction; the vertical columnar steel ribs 23 are connected between the corresponding upper and lower guide blocks 22, providing vertical support and enhancing the rigidity of the movable formwork 2; the horizontal and vertical stiffeners are uniformly distributed on the formwork body, used to enhance the overall strength and stability of the formwork.

[0059] Thus, this rapid adjustment function of the movable formwork 2 reduces the formwork adjustment time during construction and improves construction efficiency. Especially in the construction of complex foundation pits where the formwork shape needs to be adjusted frequently, the advantages of this design are more obvious.

[0060] In addition, the flexibility of the movable formwork 2 enables it to better fit the foundation pit wall, reducing the gap between the formwork and the foundation pit wall. This helps to improve the compactness and forming quality of concrete pouring and avoid problems such as slurry leakage and honeycombing caused by poor fitting between the formwork and the foundation pit wall.

[0061] Specifically, please refer to Figure 5 As shown, the support connecting member 3 includes a first connecting bolt 31, a second connecting bolt 32, and a nut sleeve 33, where:

[0062] The first connecting bolt 31 is connected to the movable formwork 2, the second connecting bolt 32 is connected to the sheet pile brace 1, and the nut sleeve 33 is connected between the first connecting bolt 31 and the second connecting bolt 32. One end of the nut sleeve 33 is threadedly connected to the first connecting bolt 31, and the other end is threadedly connected to the second connecting bolt 32.

[0063] Specifically in the implementation of the present invention, the movable formwork 2 is a formwork structure used in the construction or other engineering fields, which needs to be adjusted in position according to the construction progress or requirements. The function of the first connecting bolt 31 is to firmly connect the support connecting member 3 and the movable formwork 2 together. This connection method enables the support connecting member 3 to adjust its position correspondingly as the movable formwork 2 moves, thus ensuring the stability of the entire support system.

[0064] In some embodiments, when the formwork for pouring concrete needs to be moved to adapt to different construction areas, the first connecting bolt 31 can ensure that the support connecting member 3 always maintains a stable connection relationship with the movable formwork 2 during the movement of the movable formwork 2, avoiding affecting the support effect of the movable formwork 2 due to loosening of the connection.

[0065] The sheet pile brace 1, as a component of the support structure, plays the role of bearing external forces and maintaining the stability of the structure. The second connecting bolt 32 connects the support connecting member 3 and the sheet pile brace 1, enabling the support connecting member 3 to transfer the force received by the movable formwork 2 to the sheet pile brace 1.

[0066] In some other embodiments, such as in the deep foundation pit support project, the sheet pile brace 1 is used to support the side wall of the foundation pit to prevent the collapse of the side wall soil. Through the second connecting bolt 32, the support connecting member 3 can effectively transfer the load of the movable formwork 2 (used for structures such as construction operation platforms in the foundation pit) to the sheet pile brace 1, thus ensuring the safety of the entire foundation pit support system.

[0067] The nut sleeve 33 is connected between the first connecting bolt 31 and the second connecting bolt 32 . This threaded connection mode enables the nut sleeve 33 to adjust the relative position between the first connecting bolt 31 and the second connecting bolt 32 .

[0068] For example, during the installation process, if the distance between the movable formwork 2 and the sheet pile support 1 deviates from the designed distance due to construction errors, the nut sleeve 33 can be rotated to adjust the distance between the first connecting bolt 31 and the second connecting bolt 32, thereby ensuring that the support connector 3 can adapt to this deviation and achieve a reliable connection. At the same time, the threaded connection also has a certain self-locking performance, which can prevent the connector from loosening under normal working conditions.

[0069] Through this connection method, the movable formwork 2, the supporting connector 3 and the sheet pile support 1 form a stable support system. The force (such as construction load, concrete side pressure, etc.) applied to the movable formwork 2 can be transmitted to the nut sleeve 33 through the first connecting bolt 31, and then transmitted to the sheet pile support 1 through the second connecting bolt 32. This force transmission path enables the entire system to effectively withstand external forces and maintain the stability of the structure.

[0070] Specifically, see Figure 1 As shown, an annular hole 12 is provided at the center of the side of the closed end facing the foundation pit, and a limiting device 13 is provided at the center of the side of the closed end away from the foundation pit. The limiting device 13 is fixedly connected to the end of the second connecting bolt 32 away from the nut sleeve 33.

[0071] In the foundation pit support project, anchor rods can be inserted through the annular holes 12 to fix the structure in the soil or rock of the foundation pit sidewall to enhance the overall stability. The limit device 13 is used to limit the movement range of the second connecting bolt 32 to prevent it from excessive movement or loosening during use.

[0072] For example, in the support system, the second connection bolt 32 may need to maintain a certain tension, and the limit device 13 can prevent the bolt from loosening due to external force, thereby ensuring the reliability of the connection. By being fixedly connected to the second connection bolt 32, the limit device 13 can ensure the stability of the entire support connection. This connection method enables the second connection bolt 32 to effectively transfer force to the closed end when bearing load, and then to the entire support system.

[0073] Specifically, see Figure 5 As shown, an annular support 311 is provided at one end of the first connecting bolt 31 close to the movable template 2, and the annular support 311 is buckled and connected with the vertical columnar steel rib 23. In this way, through the annular support 311, the first connecting bolt 31 can better transfer the load of the movable template 2 to the vertical columnar steel rib 23.

[0074] In addition, the annular support 311 can increase the stability of the connection, prevent the bolts from skewing or loosening during the application of force, thereby improving the reliability of the entire connection system.

[0075] Specifically, please refer to Figure 5 As shown, a buffer disc 321 and a buckle 322 are provided at one end of the second connecting bolt 32 close to the sheet pile brace 1. The buffer disc 321 is adapted to be limited within the limiting device 13, and the buckle 322 is adapted to be inserted into the annular hole 12.

[0076] Specifically, the buffer disc 321 can play a buffering role when the second connecting bolt 32 is subjected to an external force, reducing the impact of the external force on the bolt and the connecting part. For example, during construction, vibrations or impact forces may occur, and the buffer disc 321 can absorb part of the energy to protect the connecting parts from damage.

[0077] In addition, the buffer disc 321 is limited within the limiting device 13, which can prevent the second connecting bolt 32 from moving excessively or loosening during use. This limiting effect ensures that the second connecting bolt 32 can maintain a stable position when bearing the load, thereby ensuring the reliability of the connection.

[0078] Specifically, please refer to Figure 5 As shown, a rotating wrench 331 is provided on the outer circumference of the nut sleeve 33. In actual operation, the position of the nut sleeve 33 can be quickly adjusted through the rotating wrench 331, improving the installation efficiency.

[0079] In this embodiment, the rotating wrench 331 utilizes the lever principle to amplify the applied torque through a longer force arm, enabling the operator to easily tighten or loosen the nut.

[0080] Specifically, please refer to Figure 5 As shown, the cross-sectional profile of the closed end is a U-shaped single plate, which is made of channel steel. The channel steel with a U-shaped cross-section has high bending and shear strength and can effectively bear the vertical load. This design can ensure that the closed end remains stable during use and will not deform or be damaged due to external forces.

[0081] Preferably, the buckle 322 is made of plastic. The buckle 322 has many technical advantages such as lightweight, cost-effectiveness, convenient installation and disassembly, durable material, flexible design, and environmental friendliness. It is particularly suitable for application scenarios that require rapid assembly, lightweight, and cost control, and can also meet complex engineering requirements.

[0082] Please refer to Figure 6 As shown, the embodiment of the present invention also provides a construction method for an integrated support structure for underground structures, and the construction method includes the steps:

[0083] Step S 100 : Fabricate the sheet pile brace 1;

[0084] At fixed intervals on the front central axis of the steel sheet pile, fabricate the annular holes 12, and weld the limiting device 13 around the annular holes 12;

[0085] In this step, by fabricating the annular holes 12 on the front central axis of the steel sheet pile and welding the limiting device 13 around the annular holes 12, it provides precise positioning and fixing points for the subsequent installation of the support connecting member 3. This design ensures that the support connecting member 3 can be quickly and accurately connected to the sheet pile brace 1 during installation, improving the construction efficiency.

[0086] Step S 200 : Insert the sheet pile brace 1 in place;

[0087] According to the structural dimensions of the underground structure and the adjustable range of the support connecting member 3, determine the excavation area of the foundation pit, and after on-site measurement and setting out, carry out the pile driving step of the sheet pile brace 1 so that the sheet pile brace 1 can form the side wall of the foundation pit;

[0088] In this step, according to the structural dimensions of the underground structure and the adjustable range of the support connecting member 3, determine the excavation area of the foundation pit, and after on-site measurement and setting out, carry out the pile driving step of the sheet pile brace 1. This step ensures that the sheet pile brace 1 can accurately form the side wall of the foundation pit, providing stable support for the subsequent construction.

[0089] Step S 300 : Fabrication and installation of the support connecting member 3;

[0090] According to the design dimensions of the support connecting member 3, fabricate the first connecting bolt 31, the second connecting bolt 32 and the nut sleeve 33 in the factory, and snap the buckle 322 of the second connecting bolt 32 into the annular hole 12 of the sheet pile brace 1, and embed the buffer disc 321 into the limiting device 13 to achieve the connection and fixation of the support connecting member 3 on the sheet pile brace 1;

[0091] After measuring and setting out according to the dimensions of the underground structure, thread the first connecting bolt 31 with the nut sleeve 33, and adjust the support length of the support connecting member 3 to meet the installation requirements of the movable formwork 2;

[0092] In this step, after measuring and setting out according to the dimensions of the underground structure, thread the first connecting bolt 31 with the nut sleeve 33, and adjust the support length of the support connecting member 3 to meet the installation requirements of the movable formwork 2. This adjustable design enables the support connecting member 3 to adapt to different construction scenarios, improving the flexibility and adaptability of the system.

[0093] Step S 400: Design and processing of the movable formwork 2;

[0094] Design and process the movable formwork 2 according to the dimensions of the underground structure, and weld the linear guide rails 21 at the upper and lower edge ribs of the movable formwork 2, and snap the guide blocks 22 onto the linear guide rails 21;

[0095] In this step, the use of the linear guide rails 21 and the guide blocks 22 ensures the smoothness and accuracy of the movement of the movable formwork 2, reducing the construction quality problems caused by the unsteady movement of the formwork.

[0096] Step S 500 : Installation of the movable formwork 2;

[0097] Insert the vertical columnar steel ribs 23 of the movable formwork 2 into the annular holes of the annular support 311 from top to bottom to complete the installation of the movable formwork 2.

[0098] In this step, through the cooperation of the annular holes of the annular support 311 and the vertical columnar steel ribs 23, the connection between the movable formwork 2 and the support connecting member 3 is ensured to be firm, improving the stability of the entire support system.

[0099] Step S 600 : Hoisting of the steel reinforcement cage of the underground structure and concrete pouring;

[0100] Hoist the steel reinforcement cage of the underground structure tied outside the site into the integrated structure, and pour concrete after completing the positioning and fixing;

[0101] Step S 700 : Demolition of the steel sheet pile support integrated structure;

[0102] First, remove the connection between the buckle 322 and the annular hole 12, so as to remove all the support connecting members 3; then remove the movable formwork 2; after the foundation pit is backfilled, pull out all the sheet pile braces 1.

[0103] Thus, the sheet pile brace 1 and the movable formwork 2 achieve structural integration and force integration through the support connecting member 3, greatly improving the stability of the support structure.

[0104] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will all fall within the protection scope of the present invention.

Claims

1. A support integrated structure for underground structures, characterized in that: include: A plurality of sheet pile supports, the sides of the sheet pile supports close to each other are connected by a butt buckle snap connection to form an integral structure with mutually reversely spaced closed ends, and the integral structure is vertically inserted outside the foundation pit; A movable template is vertically arranged on the other side of the foundation pit relative to the integral structure; A plurality of support connectors are connected between the sheet pile support and the movable formwork in a corresponding support manner.

2. The integrated support structure for underground structures according to claim 1, characterized in that: The movable template includes a template body, two linear guide rails laterally arranged on the upper and lower edge ribs of the template body, a plurality of guide blocks suitable for sliding installation on the linear guide rails, and vertical columnar steel ribs connecting the corresponding upper and lower positions of the guide blocks. A plurality of evenly distributed transverse reinforcement ribs and vertical reinforcement ribs are arranged on the template body.

3. The integrated support structure for underground structures according to claim 2, characterized in that: The supporting connecting member includes a first connecting bolt connected to the movable formwork, a second connecting bolt connected to the sheet pile support, and a nut sleeve connected between the first connecting bolt and the second connecting bolt, one end of the nut sleeve is threadedly connected to the first connecting bolt, and the other end is threadedly connected to the second connecting bolt.

4. The integrated support structure for underground structures according to claim 3, characterized in that: An annular hole is arranged at the center of one side of the closed end facing the foundation pit, and a limiting device is arranged at the center of one side of the closed end away from the foundation pit. The limiting device is fixedly connected to one end of the second connecting bolt away from the nut sleeve.

5. The integrated support structure for underground structures according to claim 3, characterized in that: An annular support is provided at one end of the first connecting bolt close to the movable template, and the annular support is buckled and connected to the vertical columnar steel rib.

6. The integrated support structure for underground structures according to claim 4, characterized in that: A buffer disc and a buckle are provided at one end of the second connecting bolt close to the sheet pile support, the buffer disc is suitable for being limited in the limiting device, and the buckle is suitable for being inserted in the annular hole.

7. The integrated support structure for underground structures according to claim 3, characterized in that: A rotary wrench is arranged on the outer circumference of the nut sleeve.

8. The integrated support structure for underground structures according to claim 3, characterized in that: The cross-sectional profile of the closed end is a U-shaped single plate, and the U-shaped single plate is made of channel steel.

9. The integrated support structure for underground structures according to claim 6, characterized in that: The buckle is made of plastic.

10. A construction method for an integrated support structure for underground structures according to any one of claims 1 to 9, characterized in that: The construction method comprises the steps of: Step S 100 : Processing and manufacturing sheet pile supports; Annular holes are processed at fixed intervals on the front center axis of the steel sheet pile, and the limiting devices are welded around the annular holes; Step S 200 : The sheet pile support is inserted into place; According to the structural dimensions of the underground structure and the adjustable range of the supporting connectors, the excavation area of ​​the foundation pit is determined, and the pile sinking step of the sheet pile support is carried out after on-site measurement and layout, so that the sheet pile support can form the side wall of the foundation pit; Step S 300 : Processing and installation of supporting connectors; According to the design size of the supporting connector, the first connecting bolt, the second connecting bolt and the nut sleeve are processed in the factory, and the buckle of the second connecting bolt is inserted into the annular hole of the sheet pile support, and the buffer disc is embedded in the limit device to realize the connection and fixation of the supporting connector on the sheet pile support; After measuring and laying out the size of the underground structure, the first connecting bolt is threadedly connected to the nut sleeve, and the supporting length of the supporting connector is adjusted to meet the installation requirements of the movable formwork; Step S 400 : Design and processing of movable templates; Design and process the movable template according to the size of the underground structure, weld the linear guide rails to the upper and lower edge ribs of the movable template, and insert the guide blocks on the linear guide rails; Step S 500 : Installation of movable templates; Align the vertical columnar steel ribs of the movable formwork with the annular holes of the annular support and insert them from top to bottom to complete the installation of the movable formwork; Step S 600 : Lifting of steel cages and pouring of concrete for underground structures; Lift the steel cage of the underground structure tied off-site into the integrated support structure, and pour concrete after positioning and fixing; Step S 700 : Demolition of integrated support structure; First, remove the connection between the clip and the annular hole, thereby removing all the supporting connectors; then remove the movable formwork; and after backfilling the foundation pit, remove all the sheet pile supports.

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