An underground main structure modular temporary sealing wall and a construction method thereof

Abstract

The application discloses a kind of underground main structure modular temporary plugging wall and its construction method, and plugging wall includes: the connecting reinforcement for being arranged at the port of underground main structure, for assisting to strengthen positioning plugging wall overall structure;Prefabricated concrete module, including square module main body, module interconnection mechanism, pre-embedded handle, reinforcing rib plate, water stop unit;The module interconnection mechanism includes the groove being opened in the periphery of the module main body, the connecting reinforcement being fixedly connected with module main body and the end being elongated into the groove, the interconnection component for the interconnection of connecting reinforcement between modules;By using modular prefabricated concrete structure assembly to form temporary plugging wall, effectively solve the technical problem that traditional retaining wall needs to use large mechanical equipment to break, cause pre-embedded component and waterproof layer to cause damage, enhance the safety of construction, ensure the structure connection quality, simultaneously detachable module group can realize reuse, with green environmental protection effect.

Description

Technical Field

[0001] This invention belongs to the technical field of temporary sealing walls for underground main structures, and more specifically, relates to a modular temporary sealing wall for underground main structures and its construction method. Background Technology

[0002] Currently, underground linear projects such as underground ring roads and underground utility tunnels are often constructed in phases and sections, requiring the reservation of connection points for later connection. Therefore, after the existing structure is completed, retaining walls are used for temporary sealing, followed by earthwork backfilling. When the main structure is connected in the subsequent construction, the earthwork is excavated to the design foundation pit bottom elevation, and then the sealing wall is broken.

[0003] Regarding the aforementioned sealing wall design, on-site construction typically involves simultaneously pouring the concrete retaining wall and the main structure, followed by mechanical demolition of the sealing wall. Furthermore, Chinese invention patent CN104099942B discloses a design and construction method for a temporary sealing wall, characterized by: pre-embedding connecting steel bars at the ends of the pre-constructed box culvert structure; setting low-foamed PVC filling blocks according to the shape and position of the embedded and externally attached waterstops at the ends of the pre-constructed box culvert structure; and pouring reinforced concrete connecting blocks to connect the main box culvert structure and the temporary sealing wall as a single unit. Additionally, Chinese invention patent CN108049425A… A temporary sealing wall structure and construction method for a utility tunnel are disclosed. The structure includes H1-shaped steel, H2-shaped steel, H3-shaped steel, H4-shaped steel, and a sealing plate. The H1-shaped steel, H2-shaped steel, and H3-shaped steel are welded together to form a sealing skeleton. A waterproof mortar pad is provided at the bottom of the sealing skeleton. A polysulfide sealant layer is provided at the connection between the sealing skeleton and the utility tunnel. The sealing skeleton is sealed to the upper and lower surfaces of the utility tunnel through the waterproof mortar pad and the polysulfide sealant layer. The sealing plate is welded onto the sealing skeleton, and the H4-shaped steel is fixed inside the sealing plate. The two ends of the H4-shaped steel are fixed to the wall of the utility tunnel with bolts to fix the temporary sealing wall.

[0004] The above technologies have all realized the design and construction of temporary sealing walls for underground main structures, but there are the following technical problems: (1) When the main structure and retaining wall are cast in an integrated manner, the existing components such as the reserved components, connecting steel bars, and waterproof layer at the joint are easily damaged when the sealing wall is broken due to the use of mechanical construction. This results in the reserved steel bars and waterproof layer being damaged when the new and old structures are connected, affecting the connection quality and waterproof performance of the main structure and increasing the maintenance work in the later stage; (2) The risk is high when mechanically breaking the whole panel wall. At the same time, the concrete fragments generated during the demolition process are not easy to clean up. The demolition process is easy to disturb the main structure, which may cause cracks in the structure; (3) The use of steel profiles and sealing plates for sealing involves many welding procedures. The steel profiles at the top plate need to be welded and bolted, which is difficult to implement. Summary of the Invention

[0005] To address the aforementioned deficiencies or improvement needs of existing technologies, this invention provides a modular temporary sealing wall for underground main structures and its construction method. By assembling a modular precast concrete structure to form the temporary sealing wall, it effectively solves the technical problem of traditional retaining walls requiring large machinery for demolition, which damages embedded components and waterproof layers. This enhances construction safety, ensures structural connection quality, and allows for reuse of detachable modules, thus achieving an environmentally friendly effect. Furthermore, by combining precast and cast-in-place methods to form reinforcing ribs, the dispersed modular structures are connected and reinforced to form a whole, further improving the overall load-bearing performance of the temporary sealing wall. According to a first aspect of this invention, a modular temporary sealing wall for underground main structures, characterized in that it comprises:

[0006] The connecting steel bars located at the port of the underground main structure are used to assist in strengthening the overall structure of the positioning and sealing wall;

[0007] A precast concrete module includes a square module body, a module interconnection mechanism disposed around the module body as a primary reinforcing connector for each module, a pre-embedded handle fixedly installed in the middle of the module body, a reinforcing rib plate disposed on the back side of the module body as a secondary reinforcing connector, and a water-stop unit.

[0008] The module interconnection mechanism includes grooves formed around the module body, connecting steel bars fixedly connected to the module body and extending to the grooves at their ends, and interconnection components for connecting the connecting steel bars between modules.

[0009] The precast concrete modules are transported to the underground main structure installation area by pre-embedded handles, and the connecting steel bars between the underground main structure and the precast concrete modules, and between the precast concrete modules themselves, are positioned and connected by the module interconnection mechanism. The connection and positioning are further strengthened by reinforcing ribs, thereby completing the construction of the modular sealing wall.

[0010] Preferably, the interconnection component includes:

[0011] The connecting steel bars in the groove are composed of a first connecting steel bar set on the lower left side and a second connecting steel bar set on the upper right side of the module body;

[0012] Threads are formed at the ends of the connecting reinforcing bars;

[0013] A straight threaded sleeve with internal threads that connect to the threaded ends of the connecting steel bars is used for butt joints between the ends of adjacent connecting steel bars.

[0014] A rotating handle located on the side of a straight threaded sleeve.

[0015] Preferably, the interconnection component further includes:

[0016] The straight threaded sleeve has a full thread along the axial direction.

[0017] The thread length of the second connecting steel bar is not less than the thread length inside the straight thread sleeve;

[0018] The thread length of the first connecting steel bar is set to be half the axial length of the straight thread sleeve.

[0019] Preferably, the water-stopping unit includes:

[0020] A series of caulking grooves are continuously opened around the precast concrete module;

[0021] Water-stopping strip installed inside the caulking groove.

[0022] Preferably, the interconnection component includes:

[0023] Turn the handle;

[0024] A plug-in component used to snap into the groove to position modules together;

[0025] A linear transmission unit that converts the rotational force of the rotating handle into the horizontal linear insertion force of the plug-in assembly.

[0026] Preferably, the linear transmission unit includes:

[0027] A base plate fixedly connected to the bottom surface of the groove below the groove, and a lead screw positioning block fixedly connected to the base plate and used for positioning the transmission lead screw;

[0028] A driven worm gear is coaxially and fixedly connected to the rear side of the transmission screw, and a driving worm gear meshes with the driven worm gear for transmission. The driving worm gear is coaxially and fixedly connected to the rotating handle.

[0029] A helical transmission block is connected to the helical transmission of the transmission screw, and the helical transmission block is fixedly connected to the support block and the plug-in assembly through a support connecting plate.

[0030] Preferably, the plug-in assembly comprises:

[0031] A sliding connection block with an internal through hole and fitted onto the connecting steel bars to maintain a sliding connection;

[0032] The inner positioning steel plate is slidably connected to the groove set on the surface of the base plate;

[0033] The sliding connecting block is used to snap the connecting steel bars, and the inner positioning steel plate is used to insert between the inner side of the groove and the connecting steel bars, so as to play the role of snapping between modules.

[0034] According to a second aspect of the present invention, a construction method for a modular temporary sealing wall for an underground main structure includes the following steps:

[0035] S100: First, pre-embed the connecting steel bars; before pouring the main structure concrete, determine the location of the temporary sealing wall, and based on the size of the opening to be sealed on site, determine the optimal size of the precast concrete module to be installed and the specifications and location of the connecting steel bars, to ensure that the precast module can be used multiple times, and use this to locate the position and size of the pre-embedded connecting steel bars in the main structure and the position of the pre-embedded steel bars in the post-concrete stiffening ribs; the pre-embedded connecting steel bars of the module should be threaded in advance, and the direction of the steel bar threads on both sides of the connection position should be consistent when threading, and the effective length of the exposed threads after pre-embedding should match the connecting steel bars at the corresponding position of the module, so as to connect with the concrete module. The construction can be carried out by pre-embedding before the initial setting of the concrete after pouring or by placing the steel bars directly and then pouring the concrete, and it should be ensured that the pre-embedded steel bars are not disturbed.

[0036] S200: Precast concrete modules; the size and quantity of each precast concrete module are determined based on the size of the opening to be temporarily sealed on site. A groove and annular caulking groove are left in the middle of each of the four sides of the module. The width of the groove should be sufficient to allow for the working space when tightening the straight threaded sleeve with a small wrench. The reserved length of the connecting steel bars on the module is flush with the edge of the module. The length of the connecting steel bars on the upper and right sides of the module is the full length of the straight threaded sleeve, and the sleeve is installed there. The length of the threaded steel bars on the lower and left sides of the module is 1 / 2 the length of the straight threaded sleeve, ensuring a good connection between the module and the main structure and between modules. Two handles are reserved on the precast concrete module to facilitate hoisting and transportation during the installation and dismantling of the temporary retaining wall.

[0037] S300: Install concrete modules layer by layer;

[0038] S400: Cast concrete stiffening ribs; according to the steel bar joints pre-embedded in the bottom and top slabs of the structure during the casting of the main structure concrete, the steel bars of the stiffening ribs are tied and the formwork is installed. The stiffening ribs are set between the module groove and the handle. After the subsequent backfilling, the retaining wall itself and the stiffening ribs behind it can jointly resist the soil pressure of the backfill soil on the outside of the structure, ensuring the stability of the entire temporary sealing wall.

[0039] S500: Demolish concrete modules layer by layer;

[0040] S600: Cutting of structural connection steel bars; After the temporary sealing wall is demolished, the exposed connection steel bars on the structure should be cut and ground flat so as not to affect the construction of subsequent procedures.

[0041] Preferably, step S300 further includes the following steps:

[0042] S301: Before module installation, fill the annular caulking groove with water-swellable sealing strips;

[0043] S302: During installation, mechanical hoisting is used. The hook is suspended above the short side of the pre-embedded handle of the module for transportation and hoisting, which can ensure that the module is always in a vertical and upright state during transportation and hoisting.

[0044] S303: After the first module is in place, since the threads on both sides of the connecting steel bar are in the same direction, a small wrench can be used on the handle of the straight thread sleeve. By rotating the handle, the straight thread sleeve pre-reserved on the main structure is screwed into the module direction, connecting the pre-reserved steel bars of the structure and the module to form a whole.

[0045] S304: Using the same method, install and connect each module layer by layer from bottom to top to form a whole. After installation, check the connection of each straight threaded sleeve and take certain protective measures for the straight threaded sleeve in the groove to prevent the sleeve from rusting.

[0046] S305: If there are gaps between the module and the structure due to unevenness of the main structure surface, polyurethane foam can be used to fill the gaps.

[0047] Preferably, step S500 further includes the following steps:

[0048] S501; When the subsequent underground main structure needs to be connected with the structure constructed in the early stage, after the earthwork is excavated to the foundation elevation, the stiffening ribs behind the temporary sealing wall shall be removed on the inside of the structure constructed in the early stage.

[0049] S502: Next, use a small wrench to loosen the straight threaded sleeve, so that the connection between the module and the structure is broken and separated into individual units. The concrete modules are disassembled layer by layer and hoisted to the designated location and stacked neatly until the entire temporary sealing wall is removed.

[0050] S503: The removed modules can be used for temporary sealing in other areas. A small number of new modules can be added or the number of modules can be reduced according to the size of the temporary sealing opening to meet the temporary sealing requirements of the new area.

[0051] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects:

[0052] 1. The present invention provides a modular temporary sealing wall for underground main structures. By assembling modular precast concrete structures to form a temporary sealing wall, it effectively solves the technical problem that traditional retaining walls require the use of large mechanical equipment for demolition, which causes damage to embedded components and waterproof layers. This enhances construction safety, ensures the quality of structural connections, and allows for reuse of detachable modular units, thus achieving a green and environmentally friendly effect. Furthermore, by using a combination of precast and cast-in-place methods to form reinforcing ribs, the dispersed modular structures are connected and reinforced to form a whole, further improving the load-bearing performance of the entire temporary sealing wall.

[0053] 2. The present invention provides a modular temporary sealing wall for underground main structures. By using threaded sleeve interconnection components to strengthen the connection between modules and structures, and between modules themselves, it effectively solves the technical problem of installation difficulties caused by the connection of steel bars being fixed within their respective components and unable to rotate. After the modules are installed in place, the modules are tightened and reinforced by using a straight threaded sleeve with one end of the steel bar fully threaded and the other end partially threaded, keeping the thread direction of both ends consistent. This achieves a tight connection between the two, resulting in good load-bearing capacity and easy installation and disassembly.

[0054] 3. The present invention provides a modular temporary sealing wall for underground main structure, which eliminates the existing welding method by using snap-fit ​​or threaded connection for positioning. This not only improves installation efficiency and simplifies construction equipment and construction difficulty, but also allows for multiple reuse of materials by using detachable connection, thereby improving module utilization.

[0055] 4. The present invention provides a modular temporary sealing wall for underground main structures. By combining a worm gear module with a lead screw and slider structure, the manual turntable 1216 is located outside the groove 4, solving the technical problem of limited space when the wrench applies rotational force to control the horizontal movement of the sleeve. In use, only the manual turntable 1216 needs to be manually rotated to realize the horizontal movement of the sliding connecting block 1203 and to engage with the connecting steel bars. In addition, an inner positioning steel plate 1202 is added to the locking part of the sliding connecting block 1203. It is positioned relative to the sliding connecting block 1203. While the sliding connecting block 1203 is horizontally moving and engaging with the adjacent connecting steel bars, the sliding connecting block 1203 is inserted between the inner side of the groove 4 and the connecting steel bars, which further strengthens the positioning between adjacent templates. Attached Figure Description

[0056] Figure 1 This is a schematic diagram of a precast concrete module structure of a modular temporary sealing wall for an underground main structure, according to an embodiment of the present invention.

[0057] Figure 2 This is a schematic diagram of the installation process of a straight threaded sleeve for a modular temporary sealing wall for an underground main structure, according to an embodiment of the present invention.

[0058] Figure 3 This is a schematic diagram of the first connecting steel reinforcement structure of a modular temporary sealing wall for an underground main structure according to an embodiment of the present invention;

[0059] Figure 4 This is a schematic diagram of the installation state of the second connecting steel reinforcement of a modular temporary sealing wall for underground main structure according to an embodiment of the present invention;

[0060] Figure 5 This is a structural schematic diagram of the completed installation state of the connecting steel bars of a modular temporary sealing wall for an underground main structure according to an embodiment of the present invention;

[0061] Figure 6 This is a schematic diagram of the installation state of the bottom modular temporary sealing wall of an underground main structure according to an embodiment of the present invention;

[0062] Figure 7 This is a schematic diagram of the installation state of a multi-layer modular temporary sealing wall for an underground main structure, according to an embodiment of the present invention.

[0063] Figure 8 This is a schematic diagram of the completed installation state of a modular temporary sealing wall for an underground main structure according to an embodiment of the present invention;

[0064] Figure 9 This is a schematic diagram of the completed installation state of a modular temporary sealing wall for an underground main structure according to an embodiment of the present invention;

[0065] Figure 10 This is a schematic diagram of the right-side slot structure of a modular temporary sealing wall for an underground main structure according to an embodiment of the present invention;

[0066] Figure 11 This is a front view of the inter-block positioning and connection unit of a modular temporary sealing wall for an underground main structure according to an embodiment of the present invention;

[0067] Figure 12 This is a side view of a positioning and connection unit between modular temporary sealing wall blocks of an underground main structure according to an embodiment of the present invention;

[0068] Figure 13 This is a flowchart illustrating a construction method for a modular temporary sealing wall for an underground main structure, according to an embodiment of the present invention.

[0069] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1-main structure, 2-reserved connecting steel bar, 3-precast concrete module, 4-groove, 401-groove bottom surface, 402-groove side surface, 5-straight threaded sleeve, 6-first connecting steel bar, 7-second connecting steel bar, 8-embedded handle, 9-concrete stiffening rib plate, 10-caulking groove, 11-handle, 1201-base plate, 1202-inner positioning steel plate, 1203-sliding connecting block, 1210-motion adjustment mechanism, 1211-screw positioning block, 1212-transmission screw, 1213-driven worm gear, 1214-screw transmission block, 1215-driving worm gear, 1216-manual turntable, 1217-support block, 1218-support connecting plate. Detailed Implementation

[0070] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0071] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0072] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0073] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0074] According to a first aspect of the invention, such as Figures 1-12 As shown, the aforementioned modular temporary sealing wall for underground main structures includes:

[0075] The connecting steel bars located at port 1 of the underground main structure are used to assist in strengthening the overall structure of the positioning and sealing wall;

[0076] The precast concrete module 3 includes a square module body, a module interconnection mechanism set around the module body as a primary reinforcing connector for each module, a pre-embedded handle 8 fixedly installed in the middle of the module body, a reinforcing rib plate set on the back side of the module body as a secondary reinforcing connector, and a water-stop unit.

[0077] The module interconnection mechanism includes a groove 4 formed around the module body, a connecting steel bar fixedly connected to the module body and extending to the groove 4 at its end, and an interconnection component for connecting the connecting steel bars between modules.

[0078] The precast concrete module 3 is transported to the installation area of ​​the underground main structure 1 by pre-embedded handle 8, and the connecting steel bars between the underground main structure 1 and the precast concrete module 3, and between the precast concrete modules 3 and each other are positioned and connected by the module interconnection mechanism. The connection positioning is further strengthened by using reinforcing ribs, thereby completing the construction of the modular sealing wall.

[0079] In this embodiment of the invention, the use of modular precast concrete structures to assemble temporary sealing walls effectively solves the technical problem that traditional retaining walls require the use of large mechanical equipment for demolition, which can damage embedded components and waterproof layers. This enhances construction safety, ensures the quality of structural connections, and allows for reuse of detachable modular units, thus achieving a green and environmentally friendly effect. Furthermore, by combining precast and cast-in-place methods to form reinforcing ribs, the dispersed modular structures are connected and reinforced to form a whole, further improving the load-bearing performance of the entire temporary sealing wall.

[0080] like Figures 1-5 As shown, in this embodiment of the invention, the interconnection component includes:

[0081] The connecting steel bars in the groove 4 are composed of a first connecting steel bar 6 set on the lower left side of the module body and a second connecting steel bar 7 set on the upper right side;

[0082] Threads are formed at the ends of the connecting reinforcing bars;

[0083] A straight threaded sleeve 5 with internal threads and threaded connection to the end of the connecting steel bar is used for the butt joint between the ends of adjacent connecting steel bars.

[0084] The handle 11 is located on the side of the straight thread sleeve 5.

[0085] like Figures 3-5 As shown, in this embodiment of the invention, the interconnection component further includes:

[0086] The straight threaded sleeve 5 has a full thread along the axial direction.

[0087] The thread length of the second connecting steel bar 7 is not less than the thread length inside the straight thread sleeve 5;

[0088] The thread length of the first connecting steel bar 6 is set to be half the axial length of the straight thread sleeve 5.

[0089] In this embodiment of the invention, by using threaded sleeve interconnection components to strengthen the connection between modules and structures, and between modules, the technical problem of installation difficulties caused by the inability to rotate due to the connecting steel bars being fixed within their respective components is effectively solved. After the module is installed in place, the module is tightened and reinforced by using a straight threaded sleeve with one end of the steel bar fully threaded and the other end partially threaded, with the thread directions of both ends kept consistent. This achieves a tight connection between the two, resulting in good stress resistance and easy installation and disassembly.

[0090] In addition, by modifying the straight threaded sleeve and adding a handle around the sleeve, the operation of the sleeve can be reduced without the need for a torque wrench, thus reducing the operating space of the groove. This allows the sleeve to be rotated using only a small wrench placed on the handle.

[0091] like Figure 1 As shown, in this embodiment of the invention, the water-stopping unit includes:

[0092] The caulking grooves 10 are continuously opened around the precast concrete module 3;

[0093] Water-stopping strip installed inside the caulking groove 10.

[0094] like Figures 10-12 As shown, in this embodiment of the invention, a second type of interconnection component is proposed, including:

[0095] Manual turntable 1216;

[0096] A plug-in component used to snap into the groove 4 to position the modules together.

[0097] A linear transmission unit that converts the rotational force of the manual turntable 1216 into the horizontal linear insertion force of the insertion assembly.

[0098] like Figures 10-12 As shown, in this embodiment of the invention, the linear transmission unit includes:

[0099] A base plate 1201 fixedly connected to the bottom surface 401 of the groove 4 below, and a screw positioning block 1211 fixedly connected to the base plate 1201 and used for positioning the transmission screw 1212;

[0100] A driven worm gear 1213 is coaxially and fixedly connected to the rear side of the transmission screw 1212, and a driving worm gear 1215 meshes with the driven worm gear 1213 for transmission. The driving worm gear 1215 is coaxially and fixedly connected to the manual turntable 1216.

[0101] The helical transmission block 1214 is helically connected to the transmission screw 1212, and the helical transmission block 1214 is fixedly connected to the plug-in assembly via the support connecting plate 1218 and the support block 1217.

[0102] like Figures 10-12 As shown, in this embodiment of the invention, the plug-in assembly includes:

[0103] A sliding connection block 1203 with an internal through hole and fitted onto the connecting steel bar to maintain a sliding connection;

[0104] The inner positioning steel plate 1202 is slidably connected to the groove provided on the surface of the base plate 1201;

[0105] The sliding connecting block 1203 is used to snap the connecting steel bars, and the inner positioning steel plate 1202 is used to insert between the inner side of the groove 4 and the connecting steel bars, so as to play the role of snapping between modules.

[0106] In this embodiment of the invention, by combining a worm gear module with a lead screw and slider structure, the manual turntable 1216 is located outside the groove 4, solving the technical problem of limited space when the wrench applies rotational force. In use, only manual rotation of the manual turntable 1216 is required to realize the horizontal movement of the sliding connecting block 1203 and to engage with the connecting steel bars. In addition, an inner positioning steel plate 1202 is added to the locking component of the sliding connecting block 1203. It is positioned relative to the sliding connecting block 1203. While the sliding connecting block 1203 moves horizontally to engage with adjacent connecting steel bars, the sliding connecting block 1203 is inserted between the inner side of the groove 4 and the connecting steel bars, which further strengthens the positioning between adjacent templates.

[0107] According to a second aspect of the invention, such as Figure 13As shown, the construction method of the modular temporary sealing wall for underground main structure includes the following steps:

[0108] S100: First, pre-embed the connecting steel bars; before pouring the concrete of the main structure 1, determine the location of the temporary sealing wall, and based on the size of the opening to be sealed on site, determine the optimal size of the precast concrete module 3 to be installed and the specifications and location of the connecting steel bars, to ensure that the precast module can be used multiple times, and use this to locate the position and size of the pre-embedded connecting steel bars 2 of the main structure and the position of the pre-embedded steel bars of the post-concrete stiffening rib plate 9; the pre-embedded connecting steel bars of the module should be threaded in advance, and the direction of the steel bar threads on both sides of the connection position should be consistent when threading, and the effective length of the exposed threads after pre-embedding should match the connecting steel bars at the corresponding position of the module, so as to connect with the concrete module. The construction should be carried out by pre-embedding before the initial setting of the concrete after pouring or by placing the steel bars directly and then pouring the concrete, and it should be ensured that the pre-embedded steel bars are not disturbed.

[0109] S200: Precast concrete modules; the size and quantity of each precast concrete module are determined based on the size of the opening to be temporarily sealed on site. A groove 4 and an annular caulking groove 10 are reserved in the middle of each of the four sides of the module. The width of the groove should be sufficient to allow for the working space when tightening the straight threaded sleeve with a small wrench. The reserved length of the connecting steel bars on the module is flush with the edge of the module. The length of the connecting steel bars 7 on the upper and right sides of the module is the full length of the straight threaded sleeve and the sleeve is installed there. The thread length of the connecting steel bars 6 on the lower and left sides of the module is 1 / 2 the length of the straight threaded sleeve to ensure a good connection between the module and the main structure and between modules. Two handles are reserved on the precast concrete module 3 to facilitate hoisting and transportation during the installation and dismantling of the temporary retaining wall.

[0110] S300: Install concrete modules layer by layer;

[0111] S400: Pour concrete stiffening rib plate 9; According to the steel bar joints pre-embedded in the bottom and top slabs of the structure during the pouring of the main structure concrete, carry out the steel bar binding of the stiffening rib and the formwork installation. The stiffening rib is set between the module groove and the handle. After the subsequent backfilling, the retaining wall itself and the stiffening rib behind it can jointly resist the soil pressure of the backfill soil on the outside of the structure, ensuring the stability of the entire temporary sealing wall.

[0112] S500: Demolish concrete modules layer by layer;

[0113] S600: Cutting of structural connection steel bars; After the temporary sealing wall is demolished, the exposed connection steel bars on the structure should be cut and ground flat so as not to affect the construction of subsequent procedures.

[0114] In this embodiment of the invention, step S300 further includes the following steps:

[0115] S301: Before module installation, fill the annular caulking groove 10 with water-swellable sealing strips;

[0116] S302: During installation, mechanical hoisting is used. The hook is suspended above the short side of the pre-embedded handle 8 of the module for transportation and hoisting, which can ensure that the module is always in a vertical and upright state during transportation and hoisting.

[0117] S303: After the first module is in place, since the threads on both sides of the connecting steel bar are in the same direction, a small wrench can be used on the handle 11 of the straight thread sleeve. By rotating the handle, the straight thread sleeve pre-reserved on the main structure is screwed into the module direction, and the pre-reserved steel bars of the structure and the module are connected to form a whole.

[0118] S304: Using the same method, install and connect each module layer by layer from bottom to top to form a whole. After installation, check the connection of each straight threaded sleeve and take certain protective measures for the straight threaded sleeve in the groove to prevent the sleeve from rusting.

[0119] S305: If there are gaps between the module and the structure due to unevenness of the main structure surface, polyurethane foam can be used to fill the gaps.

[0120] In this embodiment of the invention, step S500 further includes the following steps:

[0121] S501; When the subsequent underground main structure 1 needs to be connected with the structure constructed earlier, after the earthwork excavation reaches the foundation elevation, the stiffening ribs behind the temporary sealing wall on the inside of the structure constructed earlier shall be removed.

[0122] S502: Next, use a small wrench to loosen the straight threaded sleeve, so that the connection between the module and the structure is broken and separated into individual units. The concrete modules are disassembled layer by layer and hoisted to the designated location and stacked neatly until the entire temporary sealing wall is removed.

[0123] S503: The removed modules can be used for temporary sealing in other areas. A small number of new modules can be added or the number of modules can be reduced according to the size of the temporary sealing opening to meet the temporary sealing requirements of the new area.

[0124] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A modular temporary sealing wall for underground main structures, characterized in that, include: The connecting steel bars located at the port of the underground main structure (1) are used to assist in strengthening the overall structure of the positioning and sealing wall; The precast concrete module (3) includes a square module body, a module interconnection mechanism set around the module body as a primary reinforcing connector for each module, a pre-embedded handle (8) fixedly installed in the middle of the module body, a reinforcing rib plate set on the back side of the module body as a secondary reinforcing connector, and a water-stop unit. The module interconnection mechanism includes a groove (4) formed around the module body, a connecting steel bar fixedly connected to the module body and extending to the groove (4) at its end, and an interconnection component for connecting the connecting steel bars between modules. The precast concrete module (3) is transported to the installation area of ​​the underground main structure (1) by pre-embedded handle (8), and the connecting steel bars between the underground main structure (1) and the precast concrete module (3) and between the precast concrete module (3) are positioned and connected by the module interconnection mechanism, and the connection positioning is further strengthened by using reinforcing ribs, thereby completing the construction of the modular sealing wall. The interconnection components include: Manual turntable (1216); The plug-in component is used to snap into the groove (4) to position the modules together. A linear transmission unit that converts the rotational force of the manual turntable (1216) into the horizontal linear insertion force of the insertion assembly; The linear transmission unit includes: A base plate (1201) fixedly connected to the bottom surface (401) of the groove (4) below the groove, and a screw positioning block (1211) fixedly connected to the base plate (1201) and used for positioning the transmission screw (1212). A driven worm gear (1213) is coaxially and fixedly connected to the rear side of the transmission screw (1212), and a driving worm gear (1215) meshes with the driven worm gear (1213). The driving worm gear (1215) is coaxially and fixedly connected to the manual turntable (1216). A helical transmission block (1214) is helically connected to the transmission screw (1212), and the helical transmission block (1214) is fixedly connected to the support block (1217) and the plug-in assembly through a support connecting plate (1218); The aforementioned plug-in assembly includes: A sliding connection block (1203) with an internal through hole and fitted onto the connecting steel bar to maintain a sliding connection. The inner positioning steel plate (1202) is slidably connected to the groove provided on the surface of the base plate (1201). The sliding connecting block (1203) is used to snap the connecting steel bars, and the inner positioning steel plate (1202) is used to insert between the inner side of the groove (4) and the connecting steel bars, so as to play the role of snapping between modules.

2. The modular temporary sealing wall for underground main structure according to claim 1, characterized in that, The interconnection components include: The connecting steel bars in the groove (4) are composed of the first connecting steel bar (6) set on the lower left side of the module body and the second connecting steel bar (7) set on the upper right side; Threads are formed at the ends of the connecting reinforcing bars; A straight threaded sleeve (5) with internal threads and threaded connection to the end of the connecting steel bar is used for the connection between the ends of adjacent connecting steel bars. A handle (11) is provided on the side of the straight thread sleeve (5).

3. A modular temporary sealing wall for underground main structures according to claim 2, characterized in that, The interconnection component further includes: The straight thread sleeve (5) has a full thread along the axial direction; The thread length of the second connecting steel bar (7) is not less than the thread length inside the straight thread sleeve (5); The thread length of the first connecting steel bar (6) is set to be half the axial length of the straight thread sleeve (5).

4. A modular temporary sealing wall for underground main structures according to any one of claims 1 to 3, characterized in that, The aforementioned water-stopping unit includes: A caulking groove (10) is continuously opened around the precast concrete module (3). Water-stop strip installed inside the caulking groove (10).

5. A construction method for a modular temporary sealing wall for an underground main structure, applied to the modular temporary sealing wall for an underground main structure as described in claim 2, characterized in that, Includes the following steps: S100: First, pre-embed the connecting steel bars; before pouring the main structure (1) concrete, determine the location of the temporary sealing wall, and according to the size of the opening to be sealed on site, formulate the optimal size of the precast concrete module (3) to be installed and the specifications and location of the connecting steel bars, so as to ensure that the precast module can be used multiple times, and use this to locate the location and size of the pre-embedded connecting steel bars (2) of the main structure and the location of the pre-embedded steel bars of the post-installed concrete stiffening rib plate (9); the pre-embedded connecting steel bars of the module should be threaded in advance. When threading, the direction of the steel bar threads on both sides of the connection position should be consistent, and the length of the exposed effective thread after pre-embedding should match the connecting steel bars at the corresponding position of the module so as to connect with the concrete module. The construction is carried out by pre-embedding before the initial setting of the concrete after pouring or by placing the steel bars directly and then pouring the concrete. It should be ensured that the pre-embedded steel bars are not disturbed. S200: Precast concrete modules; The size and quantity of a single precast concrete module are determined based on the size of the opening to be temporarily sealed on site. A groove (4) and an annular caulking groove (10) are left in the middle of each of the four sides of the module. The width of the groove should meet the working space when tightening the straight thread sleeve with a small wrench. The reserved length of the connecting steel bar on the module is flush with the edge of the module. The length of the second connecting steel bar (7) on the upper and right sides of the module is the full length of the straight thread sleeve and the sleeve is installed here. The thread length of the first connecting steel bar (6) on the lower and left sides of the module is 1 / 2 the length of the straight thread sleeve to ensure that the module is properly connected with the main structure and between modules. Two handles are reserved on the precast concrete module (3) to facilitate hoisting and transportation during the installation and dismantling of the temporary retaining wall. S300: Install concrete modules layer by layer; S400: Pour concrete stiffening ribs (9); According to the steel bar joints pre-embedded in the bottom and top slabs of the structure when pouring the main structure concrete, carry out the steel bar binding of the stiffening ribs and the formwork installation. The stiffening ribs are set between the module groove and the handle. After the subsequent backfilling, the retaining wall itself and the stiffening ribs behind it jointly resist the soil pressure of the backfill soil on the outside of the structure, ensuring the stability of the entire temporary sealing wall. S500: Demolish concrete modules layer by layer; S600: Cutting of structural connection steel bars; After the temporary sealing wall is demolished, the exposed connection steel bars on the structure should be cut and ground flat so as not to affect the construction of subsequent procedures.

6. The construction method of a modular temporary sealing wall for an underground main structure according to claim 5, characterized in that, Step S300 further includes the following steps: S301: Before module installation, fill the annular caulking groove (10) with water-swellable sealing strips; S302: During installation, mechanical hoisting is used. The hook is suspended above the short side of the pre-embedded handle (8) of the module for transportation and hoisting, ensuring that the module is always in a vertical and upright state during the transportation and hoisting process. S303: After the first module is in place, since the threads on both sides of the connecting steel bar are in the same direction, a small wrench is used on the handle (11) of the straight thread sleeve. By rotating the handle, the straight thread sleeve pre-reserved on the main structure is screwed into the module direction, and the pre-reserved steel bars of the structure and the module are connected to form a whole. S304: Using the same method, install and connect each module layer by layer from bottom to top to form a whole. After installation, check the connection of each straight threaded sleeve and take certain protective measures for the straight threaded sleeve in the groove to prevent the sleeve from rusting. S305: If the unevenness of the main structure surface causes gaps between the module and the structure, polyurethane foam should be used to fill the gaps.

7. A construction method for a modular temporary sealing wall for an underground main structure according to any one of claims 5 or 6, characterized in that, Step S500 further includes the following steps: S501: When the subsequent underground main structure (1) needs to be connected with the structure constructed in advance, after the earthwork is excavated to the foundation elevation, the stiffening ribs behind the temporary sealing wall on the inside of the structure constructed in advance shall be removed. S502: Next, use a small wrench to loosen the straight threaded sleeve, so that the connection between the module and the structure is broken and separated into individual units. Disassemble the concrete modules layer by layer and hoist them to the designated location and stack them neatly until the entire temporary sealing wall is removed. S503: The removed modules are used for temporary sealing of other parts. Depending on the size of the temporary sealing opening, a small number of new casting modules may be added or modules may be reduced to meet the temporary sealing requirements of the new area.

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