Grid-shaped reinforced concrete underground diaphragm wall and construction method thereof

Abstract

The invention discloses a grid-shaped reinforced concrete underground diaphragm wall which comprises an underground diaphragm wall body, the underground diaphragm wall body is of a grid-shaped structure, and the underground diaphragm wall body is formed by a plurality of rigid joints which are buckled and locked with one another and pouring concrete in sections; according to the reinforced concrete underground diaphragm wall tool capable of being constructed into the grid-shaped structure and the construction method, the application range of the reinforced concrete underground diaphragm wall is expanded, and the grid-shaped underground diaphragm wall can improve the joint connecting quality of an underground space supporting structure or a building foundation bearing structure; the integral supporting, load-bearing and impact-resistant functions of the reinforced concrete underground diaphragm wall are remarkably improved, and great help is provided for improving the safety and prolonging the service life of an underground space or a structure.

Description

Technical Field

[0001] The invention relates to the technical fields of water conservancy, municipal administration, environment and seaport engineering, and more particularly to a grid-shaped reinforced concrete underground continuous wall and a construction method thereof. Background Art

[0002] Reinforced concrete underground continuous walls are now widely used in domestic underground enclosure and support structure engineering fields such as municipal engineering, marine engineering, hydropower and transportation; the existing reinforced concrete underground continuous walls are generally regular long strips for easy connection, while the reinforced concrete underground continuous walls with grid-shaped structures are still relatively rare in China; the existing reinforced concrete underground continuous wall joints are divided into rigid joints and flexible joints according to the construction method. Rigid joints can bear greater horizontal and vertical tensile and shear stresses, the overall rigidity of the wall is greater, and the anti-seepage performance of rigid joints is also better than other joint forms; the current common rigid joints of steel cages, such as cross steel plate joints, I-beam joints and other joints, all involve the use and welding of a large number of steel plates or steel sections. There is a lack of continuous connection of the steel structure between the first and second phases of concrete after solidification, and it is not easy to meet the standards by brushing the joints. Therefore, the joints between the first and second phases are prone to water leakage defects, and it is difficult to transmit large tensile and shear forces between the first and second phases. Summary of the invention

[0003] In view of this, the present invention provides a grid-shaped reinforced concrete underground continuous wall and a construction method thereof, aiming to provide a reinforced concrete underground continuous wall that can be constructed into a grid-shaped structure, expand the scope of application, and improve the joint quality problems that usually occur in the current underground deep foundation pit or underground space retaining structure, and significantly improve the overall function of the reinforced concrete underground continuous wall; lay a better foundation for designing the reinforced concrete underground continuous wall as a permanent structure of the underground space; and be of great help in improving the safety and service life of the underground space.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] A grid-shaped reinforced concrete underground continuous wall comprises an underground continuous wall body, wherein the underground continuous wall body is a grid-shaped structure and is formed by pouring concrete in sections through a plurality of rigid joints that are interlocked and locked.

[0006] Preferably, the rigid joint comprises a steel cage, a standard locking member and an adjustable locking member;

[0007] The steel cage has a plurality of longitudinal and transverse force-bearing bars;

[0008] The plurality of standard locking fasteners are respectively connected to the plurality of transverse force-bearing ribs through connecting plates, and the plurality of standard locking fasteners can be mutually buckled and locked;

[0009] The plurality of adjusting locking fasteners are respectively connected to the plurality of transverse force-bearing bars through connecting plates, and the plurality of adjusting locking fasteners can be mutually buckled and locked, and reserved holes are left at the buckled and locked joints for filling concrete.

[0010] Preferably, the standard locking component includes a first L-shaped locking connector and a first locking hook bent toward the first L-shaped locking connector.

[0011] Preferably, the adjustment locking member includes a second L-shaped locking connector and a second locking hook bent toward the second L-shaped locking connector, and a limiting plate is fixedly connected to the end surface of the second L-shaped locking connector.

[0012] Preferably, it also includes an anti-circumvention galvanized plate, and a plurality of the anti-circumvention galvanized plates are respectively connected to the plurality of the connecting plates.

[0013] The present invention also provides a construction method for constructing a grid-shaped reinforced concrete underground continuous wall, comprising the following steps:

[0014] S1. Processing a plurality of rigid joints as described above, a plurality of steel cages are connected and extended along the axis to form a standard steel cage, a plurality of steel cages are connected along the axis and extended and connected transversely in the middle to form a T-shaped steel cage, a plurality of steel cages are connected along the axis and extended and connected transversely at the ends to form an L-shaped steel cage, the extended parts of the steel cages are connected with standard fasteners or adjustable fasteners, and the underground continuous wall slot is excavated after the guide wall is prepared;

[0015] S2. After the slot hole is cleaned, a rigid joint processed in step S1 is set, and a special joint plate for positioning is set at the front end of the rigid joint and the end in the extension direction;

[0016] S3, using conduit slurry to cast the first sequence of underground continuous wall trench sections;

[0017] S4, excavating from the far end of the subsequent trench section until the entire excavation or expansion process is completed;

[0018] S5. During the hole cleaning process, the special joint plate is lifted out, and the hole is measured and the hole cleaning is completed;

[0019] S6, a subsequent rigid joint is provided and locked with the preceding rigid joint by a locking member, and a special joint plate is provided at the end of the subsequent rigid joint in the extension direction;

[0020] S7, pouring the subsequent trench section, repeating steps S4-S6, constructing a I-shaped underground continuous wall, a T-shaped underground continuous wall and an L-shaped underground continuous wall, and combining and connecting them to complete the construction of the grid-shaped reinforced concrete underground continuous wall.

[0021] Preferably, the special joint plate includes an extension joint plate for a plurality of rigid joints in a straight line and a butt joint plate for a plurality of rigid joints in a T-shaped or L-shaped extension.

[0022] Preferably, the extended joint plate comprises a first main web, a first inner connection plate, a first thick-walled steel pipe and an inner convex web;

[0023] The first main web is a groove structure, and its two side walls are hooked side panels;

[0024] The number of the first inner contact plates is two, and the two first inner contact plates are both located on the inner side of the first main web and respectively abut against the two hooked side plates;

[0025] The first thick-walled steel pipe is clamped between the two first inner connecting plates;

[0026] The inner convex web plate includes a main plate abutting against the first thick-walled steel pipe and two side plates located at both ends of the main plate and respectively fixed to the two first inner contact plates;

[0027] It also includes a first current limiting strip, which is fixed to the first inner connecting plate.

[0028] Preferably, the butt joint plate comprises a second main web, a second inner connection plate, a second thick-walled steel pipe and an inner limit support;

[0029] The second main web is a groove structure, and its two side walls are hooked side panels;

[0030] The number of the second inner contact plates is two, and the two second inner contact plates are both located on the inner side of the second main web and respectively abut against the two hooked side plates;

[0031] The second thick-walled steel pipe is clamped between the two second inner connecting plates;

[0032] The inner limit support includes a main plate abutting against the second thick-walled steel pipe and two side plates located at both ends of the main plate and respectively fixed to the two second inner contact plates;

[0033] The invention also includes a second current limiting strip, wherein the second current limiting strip is fixed on the second inner connecting plate.

[0034] Preferably, it further comprises an outer limiting plate, the number of the outer limiting plates is two, and the two outer limiting plates are respectively fixedly connected to the outer sides of the two hooked side plates.

[0035] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a grid-shaped reinforced concrete underground continuous wall and a construction method thereof, which has the following beneficial effects:

[0036] The present invention is designed to form a specific interlocking structure for use on the steel cage body through the reasonable processing of fewer steel components, and is connected with the transverse or longitudinal force-bearing steel bars to realize the grid-like structural layout of the reinforced concrete underground continuous wall, and realize the equivalent stress and torque transmission of the transverse or longitudinal steel bars of the steel cage at the joints, truly realizing a complete and rigid underground continuous wall body, better improving the joint quality of the underground continuous wall, and can significantly improve the durability of the joints of such projects, and reduce the operating cost of the later underground continuous wall retaining structure, that is, saving investment and construction and reducing carbon emissions, which is in line with the current national dual carbon requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0038] Figure 1 The accompanying drawing is a schematic diagram of the overall structure of the rigid joint provided by the present invention;

[0039] Figure 2 The accompanying drawing is a schematic diagram of the structure of a standard lock fastener provided by the present invention;

[0040] Figure 3 The accompanying drawing is a schematic diagram of the structure of two standard locking parts provided by the present invention being locked together;

[0041] Figure 4 The accompanying drawing is a schematic diagram of the structure of the adjustable lock fastener provided by the present invention;

[0042] Figure 5 The accompanying drawing is a schematic diagram of the structure of two adjustable lock fasteners provided by the present invention being locked together;

[0043] Figure 6 The accompanying drawing is a schematic diagram of the reserved hole structure provided by the present invention;

[0044] Figure 7 The accompanying drawing is a schematic diagram of the structure of the extended connector plate provided by the present invention;

[0045] Figure 8 The accompanying drawing is a schematic diagram of the structure of a butt-joint joint plate provided by the present invention;

[0046] Fig. 9 The accompanying drawing is a schematic diagram of the connection structure of the preceding rigid joint and the succeeding rigid joint provided by the present invention;

[0047] Fig.10 The accompanying drawing is a schematic diagram of a T-shaped steel cage connection structure provided by the present invention;

[0048] Fig.11 The accompanying drawing is a schematic diagram of the L-shaped steel cage connection structure provided by the present invention;

[0049] Fig.12 The accompanying drawing is a schematic diagram of a T-shaped connection construction structure of a preceding rigid joint and a succeeding rigid joint provided by the present invention;

[0050] Fig.13 The accompanying drawing is a schematic diagram of an L-shaped connection construction structure of a preceding rigid joint and a succeeding rigid joint provided by the present invention;

[0051] Fig.14 The accompanying drawing is a schematic diagram of a partial unit structure of a grid-shaped reinforced concrete underground continuous wall provided by the present invention;

[0052] 1. Rigid joint; 2. Steel cage; 3. Standard locking piece; 31. Adjustment locking piece; 32. Reserved hole; 4. Connecting plate; 5. First L-shaped locking connector; 6. First locking hook; 7. Second L-shaped locking connector; 8. Second locking hook; 9. Limiting plate; 10. Anti-circumvention galvanized plate; 11. Extended joint plate; 12. First main web; 13. First inner connection plate; 14. First thick-walled steel pipe; 15. Inner convex web; 16. Current limiting strip; 17. Butt joint plate; 18. Second main web; 19. Second inner connection plate; 20. Second thick-walled steel pipe; 21. Inner limiting support; 22. Outer limiting plate. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] See also Figure 1-14 The embodiment of the present invention discloses a grid-shaped reinforced concrete underground continuous wall, including an underground continuous wall body, wherein the underground continuous wall body is a grid-shaped structure, and the underground continuous wall body is formed by pouring concrete in sections by a plurality of rigid joints 1 that are interlocked and locked with each other.

[0055] In this embodiment, a plurality of rigid joints 1 are designed to be interlocked and locked with each other to form a straight-line structure, an L-shaped structure, a T-shaped structure, etc. The various structures are combined to form a grid-like structure, and concrete is poured in sections to finally form a grid-like reinforced concrete underground continuous wall.

[0056] In order to further optimize the above technical solution, the rigid joint 1 includes a steel cage 2, a standard locking member 3 and an adjustable locking member 31;

[0057] The steel cage 2 has a plurality of longitudinal and transverse force-bearing bars;

[0058] A plurality of standard locking fasteners 3 are respectively connected to a plurality of transverse force-bearing ribs through a connecting plate 4, and the plurality of standard locking fasteners 3 can be mutually buckled and locked;

[0059] The plurality of adjustment locks 31 are respectively connected to the plurality of transverse force bars through the connection plates, and the plurality of adjustment locks 31 can be mutually buckled and locked, and reserved holes 32 are left at the buckled and locked places for filling concrete. The adjustment lock 31 has a longer buckling space than the standard lock 3, and a limit plate is welded thereto, so that the adjustment lock can be adjusted within the buckling space to have an appropriate range.

[0060] In this embodiment, the design and arrangement of the steel cage 2 are similar to the current steel cage 2, which is composed of longitudinal and transverse force-bearing bars, frame bars and connecting bars, which will not be repeated here. The difference lies in the welding of standard locking parts or adjustable locking parts at the ends or sides, and the weld length between the force-bearing steel bars and the connecting steel plates meets the usual design requirements; the cage body of the steel cage 2 is welded on a pre-set steel cage membrane frame, and the steel bars are cut in batches. Manual or robot welding is used to ensure the accuracy of plane and three-dimensional welding, and the welding direction of standard locking parts or adjustable locking parts at the sides, ends, upper and lower parts must ensure that they can be locked front and back.

[0061] In order to further optimize the above technical solution, the standard locking component 3 includes a first L-shaped locking connector 5 and a first locking hook 6 bent toward the first L-shaped locking connector 5 .

[0062] In order to further optimize the above technical solution, the adjustment lock fastener 31 includes a second L-shaped lock fastener 7 and a second lock hook 8 bent toward the second L-shaped lock fastener 7, and a limit plate 9 is fixedly connected to the end surface of the second L-shaped lock fastener 7. The adjustment lock fastener 31 is an adjustable lock fastener, which has the function of balancing construction errors and can realize the lock connection between two cast units; wherein the second L-shaped lock fastener of the adjustment lock fastener has a space left in the part with surplus force transmission strength, and the reserved hole 32 allows concrete to enter and fill the space.

[0063] In this embodiment, the length of the cross plate of the second L-shaped locking connector 7 is designed to be longer than the length of the cross plate of the first L-shaped locking connector 5. The second L-shaped locking connector 7, the second locking hook 8 and the limiting plate 9 together constitute a limiting space. The two adjustment locking members 31 are locked with each other, and the force can be appropriately adjusted to increase practicality. A reserved hole 32 is reserved on the adjustment locking member 31, and concrete can be filled into the space between the two mutually locked adjustment locking members 31 through the reserved hole 32; special hot-rolled interlocking steel buckle strips and steel plates of suitable sizes are used, and they are processed into special standard locking members or adjustment locking members in the factory. When processing the steel cage 2 of the underground continuous wall, the connecting plate 4 is welded to the transverse or longitudinal main reinforcement, and the weld length is greater than the equivalent lap length of the main reinforcement to ensure that the steel strength is met; if the steel strength is Under the condition of consistency, the minimum transverse cross-sectional area of ​​the standard locking piece or the adjustable locking piece shall be larger than the cross-sectional area of ​​the transverse force-bearing steel bars; the tensile and compressive strength of the vertical standard locking piece or the adjustable locking piece in the length direction shall be larger than the equivalent strength of the vertical steel bars designed at the corresponding position. If the strength of the steel is consistent, the cross-sectional area of ​​the vertical standard locking piece or the adjustable locking piece shall be larger than the cross-sectional area of ​​the designed vertical steel bars; the factory processing of the standard locking piece or the adjustable locking piece can ensure the processing accuracy, and the welding of the on-site steel bars with the standard locking piece or the adjustable locking piece can also achieve the corresponding welding quality, and can also be welded on a large scale, with a high degree of standardization and lower cost. The overall welding volume is less than the welding volume of the current cross steel plate and I-beam steel joints, and the actual steel mass consumed is less than 50% of the current joint method.

[0064] The transverse direction of the standard lock fastener or the adjustable lock fastener, the steel plate thickness of the lock fastener strip and the minimum thickness of the connecting plate 4 should be matched according to the number, size and spacing of the transverse force-bearing bars of the steel cage 2, ensuring that the product of the thickness A of the minimum connection part of the standard lock fastener or the adjustable lock fastener, the center spacing L of the force-bearing bars and the steel strength f1 is greater than the product of the cross-sectional area B of the steel bar and the strength f2 of the steel bar;

[0065] That is: A ※ L ※ f1 > B ※ f2

[0066] In the vertical direction of the standard lock or the adjusted lock, the product of the cross section a and the strength f1 of the standard lock or the adjusted lock shall be twice greater than the area b where the vertical force-bearing steel bars should be arranged and the strength f2 of the steel bars;

[0067] That is: a※f1※2>b※f2

[0068] That is, the strength of the transverse and vertical steel plates of the standard locking parts or the adjusted locking parts should be greater than the equivalent strength of the corresponding designed vertical force-bearing steel bars and transverse force-bearing main bars and have a certain safety margin to achieve the equivalent connection of the first and second sequence steel cages 2.

[0069] At present, the domestic hot rolling technology and processing technology of standard locking fasteners or adjustable locking fasteners have been greatly improved. Standard locking fasteners or adjustable locking fasteners are made of customized hot-rolled locking strips and connecting steel plates on the factory's processing platform. They can be welded manually or automatically. There are positioning and anti-deformation measures during the processing to ensure high processing accuracy, which can achieve large-scale processing and controllable costs.

[0070] In order to further optimize the above technical solution, the connecting plate 4 is an E-shaped structure, which can increase the welding contact area with the steel cage 2 and make the connection more stable.

[0071] In order to further optimize the above technical solution, it also includes an anti-circulation galvanized plate 10, and multiple anti-circulation galvanized plates 10 are respectively connected to multiple connecting plates 4. In this embodiment, the outer side of the standard locking member or the adjustable locking member fixes the anti-circulation galvanized plate 10 for preventing the flow from circling in the concrete slot hole as needed, reducing the difficulty of lifting and unloading the special joint plate 11 due to the flow.

[0072] The present invention also provides a construction method for constructing a grid-shaped reinforced concrete underground continuous wall, comprising the following steps:

[0073] S1. Process multiple rigid joints 1 as above, connect multiple steel cages along the axis in a straight line to form a standard steel cage, connect multiple steel cages along the axis in a straight line and extend them laterally in the middle to form a T-shaped steel cage, connect multiple steel cages along the axis in a straight line and extend them laterally at the ends to form an L-shaped steel cage, connect the extended parts of the steel cages with standard fasteners or adjust the fasteners, and excavate the underground continuous wall slot after the guide wall is prepared;

[0074] S2, after the slot hole is cleaned, a rigid joint 1 processed in step S1 is set, and a special positioning joint plate 11 is set at the front end and the end of the extension direction of the rigid joint 1;

[0075] S3, using conduit slurry to cast the first sequence of underground continuous wall trench sections;

[0076] S4, excavating from the far end of the subsequent trench section until the entire excavation or expansion process is completed;

[0077] S5, during the hole cleaning process, the special joint plate 11 is lifted out, the hole is measured and the hole cleaning is completed;

[0078] S6, a subsequent rigid joint 1 is provided and locked with the preceding rigid joint 1 by a locking member 3, and a special joint plate 11 is provided at the end of the subsequent rigid joint 1 in the extending direction;

[0079] S7, pouring the subsequent trench section, repeating steps S4-S6, constructing a I-shaped underground continuous wall, a T-shaped underground continuous wall and an L-shaped underground continuous wall, and combining and connecting them to complete the construction of the grid-shaped reinforced concrete underground continuous wall.

[0080] In this embodiment, the locking parts of the first-phase reinforced concrete underground continuous wall unit are protected by a special joint plate 11. After the second-phase concrete is poured in the mud groove, the first and second sequence steel cages 2 are vertically tightly connected through the special locking parts. The bottom of the locking parts of the first-phase steel cage 2 can be welded with limiting treatment measures. After the second-phase steel cage 2 is plugged and installed in place, the upper part can be welded and permanently fixed within the range near the groove hole. The vertical arrangement range of the locking parts can be arranged more than 3 meters below the bottom plate of the internal foundation pit excavation of the reinforced concrete underground continuous wall, and there is no need to arrange the entire groove. The second-phase concrete After the concrete is poured, the reinforced concrete underground continuous wall joints are rigidly connected to provide better anti-seepage and force requirements, and realize a more continuous and complete reinforced concrete underground continuous wall; the first and second sequence steel cages 2 are tightly connected through proprietary locking parts, and can be combined into a straight-line structure, an L-shaped structure, and a T-shaped structure, etc. According to the design drawings and the extension direction of the steel cages 2, various structures are combined to form a grid-shaped reinforced concrete underground continuous wall. Through the L-shaped and T-shaped structural joint connection methods, the underground continuous wall construction can be extended to the slot axis, and can also be extended laterally or vertically.

[0081] Before construction, prepare the mud mixing supply system, arrange the underwater concrete production supply system, the steel cage 2 processing workshop and the processing tire frame platform, as well as the on-site measurement and positioning and construction guide wall and platform preparation work, and construct them in the order of the above-mentioned construction method of constructing reinforced concrete underground continuous wall.

[0082] Through the above construction procedures, a complete front and rear sequence rigid joint 1 is constructed, and the construction of two unit rigid underground continuous walls is completed.

[0083] Although the steel cage 2 has a certain flexibility in the suspended state and its stiffness is not much different from that of the steel sheet pile or the special joint plate 11, there will definitely be an accumulation of construction errors, and it is possible that the lock buckle deviation cannot be plugged in. First, it is necessary to strengthen the precise measurement of the state of the steel cage 2 under the mud after the on-site installation is complete, reduce the error accumulation and timely fine-tune the local size of the steel cage 2; second, when a large deviation has occurred, the locking parts on the inner side of the subsequent steel cage 2 can be replaced with straight steel plates, and the state of the steel cage 2 can be adjusted when it is lowered, and the locking parts can be reinforced and welded after the later excavation to meet the locking requirements.

[0084] In order to further optimize the above technical solution, the special joint plate includes an extension joint plate 11 for a plurality of rigid joints with a straight extension connection and a butt joint plate 17 for a plurality of rigid joints with a T-shaped or L-shaped extension connection. The extension joint plate 11 is used for connecting the ends of the horizontal and vertical straight rigid joints; the butt joint plate 17 is used for T-shaped connection in the middle of the rigid joint and L-shaped connection at the side end of the rigid joint.

[0085] In order to further optimize the above technical solution, the extended joint plate 11 includes a first main web 12, a first inner connecting plate 13, a first thick-walled steel pipe 14 and an inner convex web 15;

[0086] The first main web 12 is a groove structure, and its two side walls are hooked side panels;

[0087] There are two first inner contact plates 13, both of which are located inside the first main web 12 and respectively abut against the two hooked side plates;

[0088] The first thick-walled steel pipe 14 is clamped between the two first inner connecting plates 13;

[0089] The inner convex web 15 includes a main board abutting against the first thick-walled steel pipe 14 and two side boards located at both ends of the main board and respectively fixed to the two first inner contact plates 13. In this embodiment, the extended joint plate 11 is a plate-type device composed of steel structure accessories such as the first main web 12, the first inner contact plate 13, the first thick-walled steel pipe 14 and the inner convex web 15. The first main web 12, the first inner contact plate 13, the first thick-walled steel pipe 14 and the inner convex web 15 are welded by steel plate processing; the extended joint plate 11 is processed by the factory to ensure the plane and three-dimensional welding accuracy, and the end hooks of the hooked side plates of the extended joint plate 11 can be inserted and locked with the locking parts of the steel cage 2 from top to bottom.

[0090] In order to further optimize the above technical solution, a current limiting strip 16 is further included, and the current limiting strip 16 is fixed on the first inner connection plate 13. In this embodiment, the current limiting strip 16 is a steel pipe or round steel with a diameter of about 20 mm.

[0091] In order to further optimize the above technical solution, the butt joint plate 17 includes a second main web 18, a second inner connection plate 19, a second thick-walled steel pipe 20 and an inner limit support 21;

[0092] The second main web 18 is a groove structure, and its two side walls are hooked side panels;

[0093] There are two second inner contact plates 19, both of which are located inside the second main web 18 and respectively abut against the two hooked side plates;

[0094] The second thick-walled steel pipe 20 is clamped between the two second inner connecting plates 19;

[0095] The inner limit stay 21 includes a main plate abutting against the second thick-walled steel pipe 20 and two side plates located at both ends of the main plate, respectively fixed to the two second inner contact plates 19. In this embodiment, the butt joint plate 17 is a plate-type device composed of steel structure accessories such as the second main web 18, the second inner contact plate 19, the second thick-walled steel pipe 20 and the inner limit stay 21. The second main web 18, the second inner contact plate 19, the second thick-walled steel pipe 20 and the inner limit stay 21 are processed and welded by steel plates; the butt joint plate 17 is processed by the factory to ensure the plane and three-dimensional welding accuracy, and the end hooks of the hooked side plates of the butt joint plate 17 can be inserted and locked with the locking parts of the steel cage 2 from top to bottom.

[0096] It also includes two outer limiting plates 22 , and the two outer limiting plates 22 are respectively fixedly connected to the outer ends of the two hooked side plates.

[0097] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0098] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A grid-shaped reinforced concrete underground continuous wall, characterized in that: It comprises an underground continuous wall body, wherein the underground continuous wall body is a lattice structure, and the underground continuous wall body is formed by pouring concrete in sections with a plurality of rigid joints which are interlocked and locked.

2. The grid-shaped reinforced concrete underground continuous wall according to claim 1, characterized in that: The rigid joint includes a steel cage, a standard locking fastener and an adjustable locking fastener; The steel cage has a plurality of longitudinal and transverse force-bearing bars; The plurality of standard locking fasteners are respectively connected to the plurality of transverse force-bearing ribs through connecting plates, and the plurality of standard locking fasteners can be mutually buckled and locked; The plurality of adjusting locking fasteners are respectively connected to the plurality of transverse force-bearing bars through connecting plates, and the plurality of adjusting locking fasteners can be mutually buckled and locked, and reserved holes are left at the buckled and locked joints for filling concrete.

3. The grid-shaped reinforced concrete underground continuous wall according to claim 2, characterized in that: The standard locking component includes a first L-shaped locking connector and a first locking hook bent toward the first L-shaped locking connector.

4. The grid-shaped reinforced concrete underground continuous wall according to claim 2, characterized in that: The adjusting lock component includes a second L-shaped lock connector and a second lock hook bent toward the second L-shaped lock connector, and a limiting plate is fixedly connected to the end surface of the second L-shaped lock connector.

5. The grid-shaped reinforced concrete underground continuous wall according to claim 2, characterized in that: It also includes an anti-circumvention galvanized plate, and a plurality of the anti-circumvention galvanized plates are respectively connected to a plurality of the connecting plates.

6. A construction method for constructing a grid-shaped reinforced concrete underground continuous wall, characterized in that: The following steps are involved: S1. Processing a plurality of rigid joints as described in any one of claims 1 to 5, wherein a plurality of steel cages are connected and extended along the axis to form a standard steel cage, a plurality of steel cages are connected along the axis and extended and connected transversely in the middle to form a T-shaped steel cage, a plurality of steel cages are connected along the axis and extended and connected transversely at the ends to form an L-shaped steel cage, the extended parts of the steel cages are connected with standard fasteners or adjustable fasteners, and the underground continuous wall slot is excavated after the guide wall is prepared; S2. After the slot hole is cleaned, a rigid joint processed in step S1 is set, and a special joint plate for positioning is set at the front end of the rigid joint and the end in the extension direction; S3, using conduit slurry to cast the first sequence of underground continuous wall trench sections; S4, excavating from the far end of the subsequent trench section until the entire excavation or expansion process is completed; S5. During the hole cleaning process, the special joint plate is lifted out, and the hole is measured and the hole cleaning is completed; S6, a subsequent rigid joint is provided and locked with the preceding rigid joint by a locking member, and a special joint plate is provided at the end of the subsequent rigid joint in the extension direction; S7, pouring the subsequent trench section, repeating steps S4-S6, constructing a I-shaped underground continuous wall, a T-shaped underground continuous wall and an L-shaped underground continuous wall, and combining and connecting them to complete the construction of the grid-shaped reinforced concrete underground continuous wall.

7. A construction method for constructing a grid-shaped reinforced concrete underground continuous wall according to claim 6, characterized in that: The special joint plate includes an extension joint plate for a plurality of rigid joints in a straight line and a butt joint plate for a plurality of rigid joints in a T-shaped or L-shaped extension.

8. A construction method for constructing a grid-shaped reinforced concrete underground continuous wall according to claim 7, characterized in that: The extended joint plate comprises a first main web, a first inner connection plate, a first thick-walled steel pipe and an inner convex web; The first main web is a groove structure, and its two side walls are hooked side panels; The number of the first inner contact plates is two, and the two first inner contact plates are both located on the inner side of the first main web and respectively abut against the two hooked side plates; The first thick-walled steel pipe is clamped between the two first inner connecting plates; The inner convex web plate includes a main plate abutting against the first thick-walled steel pipe and two side plates located at both ends of the main plate and respectively fixed to the two first inner contact plates; It also includes a first current limiting strip, which is fixed to the first inner connecting plate.

9. A construction method for constructing a grid-shaped reinforced concrete underground continuous wall according to claim 7, characterized in that: The butt joint plate comprises a second main web, a second inner connection plate, a second thick-walled steel pipe and an inner limit support; The second main web is a groove structure, and its two side walls are hooked side panels; The number of the second inner contact plates is two, and the two second inner contact plates are both located on the inner side of the second main web and respectively abut against the two hooked side plates; The second thick-walled steel pipe is clamped between the two second inner connecting plates; The inner limit support includes a main plate abutting against the second thick-walled steel pipe and two side plates located at both ends of the main plate and respectively fixed to the two second inner contact plates; The invention also includes a second current limiting strip, wherein the second current limiting strip is fixed on the second inner connecting plate.

10. A construction method for constructing a grid-shaped reinforced concrete underground continuous wall according to claim 9, characterized in that: It also includes two outer limiting plates, and the two outer limiting plates are respectively fixedly connected to the outer sides of the two hooked side plates.

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