Construction method of reinforced concrete underground diaphragm wall

Abstract

The invention discloses a construction method of a reinforced concrete underground diaphragm wall, which comprises the following steps: excavating a first sequence of underground diaphragm wall slotted hole; a reinforcement cage is arranged below, positioning joint plates are arranged below the front end of the reinforcement cage and the end in the extending direction, and a first-sequence underground diaphragm wall groove section is poured; excavation is conducted from the far end of the subsequent groove section, the whole excavation or expansion procedure is completed, and the positioning connector plate is jacked out; a subsequent reinforcement cage is arranged below and locked with the preorder reinforcement cage, and a joint plate is arranged below the end in the extension direction of the subsequent reinforcement cage; a reinforced concrete underground diaphragm wall is constructed by pouring a subsequent groove section; through a unique locking structure, equivalent stress and torque transmission of transverse or longitudinal steel bars of the reinforcement cage at joints is achieved, grid-shaped structure special-shaped layout of the reinforced concrete underground diaphragm wall is conveniently achieved, a complete and rigid underground diaphragm wall body is truly achieved, the joint quality of the underground diaphragm wall is well improved, and the construction cost is reduced. The joint durability of the engineering can be obviously improved, and the operation cost of the underground diaphragm wall enclosure structure in the later period is reduced.

Description

Technical Field

[0001] The invention relates to the technical fields of water conservancy, municipal administration, environment and seaport engineering, and more specifically to a construction method of a reinforced concrete underground continuous wall. 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 construction method of a reinforced concrete underground continuous wall, aiming to solve the above technical problems.

[0004] In order to achieve the above object, the present invention adopts the following technical solution: A construction method for a reinforced concrete underground continuous wall comprises the following steps: S1. Excavation of the first sequence of underground continuous wall slots is completed; S2. After the slot hole is cleaned, a steel cage is installed underneath, and positioning joint plates are installed at the front end of the steel cage and the end in the extension direction; S3, using conduit slurry to cast the first sequence underground continuous wall trench section; 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 positioning joint plate is lifted out, and the hole is measured and the hole cleaning is completed; S6, a subsequent steel cage is arranged and locked with the preceding steel cage, and a positioning joint plate is arranged at the end of the subsequent steel cage in the extension direction; S7, pouring the subsequent trench section, repeating steps S4-S6, and constructing a reinforced concrete underground continuous wall.

[0005] Preferably, the steel cage comprises a steel cage body, a lock body and a locking member; The steel cage body has a plurality of longitudinal and transverse force-bearing bars; The plurality of lock body parts are all fixedly connected to the ends of the reinforcement cage body in the extending direction; The plurality of locking members are all fixedly connected to one end of the reinforcement cage body close to the preceding reinforcement cage, and are used to lock with the corresponding locking body members on the preceding reinforcement cage.

[0006] Preferably, a protrusion is provided on the steel cage body, close to one end of the preceding steel cage.

[0007] Preferably, the lock body comprises a connecting plate fixedly connected to the main body of the steel cage and two locking members symmetrically fixed to the connecting plate, and the two locking members and the connecting plate together form a locking groove structure.

[0008] 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 locking members.

[0009] Preferably, the locking member includes a locking body and a clamping member; The locking body is a U-shaped structure fixedly connected to the steel cage body; There are two clamping parts, which are symmetrically connected to the opening end of the locking body; the clamping parts are inserted into the locking groove and are clamped and locked with the locking groove.

[0010] Preferably, it further comprises a limiting sleeve, and a plurality of the limiting sleeves are symmetrically connected to the open end of the locking body.

[0011] Preferably, the positioning joint plate comprises a positioning convex plate and a joint member; The positioning convex plate is a structure with a raised middle and flat ends; There are two connectors, which are respectively fixed on the flat surfaces at both ends of the positioning convex plate and are symmetrical with respect to the middle protrusion; the connector is inserted into the locking groove and locked with the locking groove.

[0012] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a construction method for reinforced concrete underground continuous wall, which has the following beneficial effects: The present invention designs a specific locking structure for use on a steel cage body through reasonable processing of fewer steel components, and is connected with transverse or longitudinal force-bearing steel bars, thereby realizing the transmission of equivalent stress and torque of the transverse or longitudinal steel bars of the steel cage at the joints, facilitating the realization of a special-shaped layout of a square structure of a reinforced concrete underground continuous wall, truly realizing a completely rigid underground continuous wall body, better improving the joint quality of the underground continuous wall, significantly improving the durability of the joints of such projects, and reducing the operating cost of the later underground continuous wall enclosure structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] 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.

[0014] Figure 1 The accompanying drawing is a schematic diagram of the steel cage structure provided by the present invention; Figure 2 The accompanying drawing is a schematic diagram of the connection structure between the preceding reinforcement cage and the succeeding reinforcement cage provided by the present invention; Figure 3 The accompanying drawing is a schematic diagram of the connection structure between the lock body and the steel cage body provided by the present invention; Figure 4 The accompanying drawing is a schematic diagram of the structure of the positioning joint plate provided by the present invention; Figure 5 The accompanying drawing is a schematic diagram of the lock body structure provided by the present invention; Figure 6 The accompanying drawing is a schematic diagram of the mutually buckled locking structure of the lock body and the locking member provided by the present invention; in: 1. Steel cage; 2. Positioning joint plate; 3. Steel cage body; 4. Lock body; 5. Locking piece; 6. Protrusion; 7. Connecting plate; 8. Locking piece; 9. Anti-circulation galvanized plate; 10. Locking body; 11. Snap-on piece; 12. Locking groove; 13. Limiting sleeve; 14. Positioning convex plate; 15. Joint piece. DETAILED DESCRIPTION

[0015] 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.

[0016] See also Figure 1-6 The embodiment of the present invention discloses a construction method of a reinforced concrete underground continuous wall, comprising the following steps: S1. Excavation of the first sequence of underground continuous wall slots is completed; S2. After the slot hole is cleaned, a steel cage 1 is installed underneath, and a positioning joint plate 2 is installed at the front end of the steel cage 1 and the end in the extension direction; Multiple steel cages 1 connected in a straight line along the axis can be a straight-line steel cage 1, which is laterally extended and connected in the middle to form a T-shaped steel cage 1. Multiple steel cages 1 are connected in a straight line along the axis and laterally extended and connected at the ends to form an L-shaped steel cage 1. Various structures are combined together to form a grid-like structure, and concrete is poured in sections to finally form a grid-like reinforced concrete underground continuous wall.

[0017] S3, using conduit slurry to cast the first sequence underground continuous wall trench section; 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 positioning joint plate 2 is lifted out, the hole is measured and the hole cleaning is completed; S6, a subsequent steel cage 1 is arranged and locked with the preceding steel cage 1, and a positioning joint plate 2 is arranged at the end of the subsequent steel cage 1 in the extending direction; S7, pouring the subsequent trench section, repeating steps S4-S6, and constructing a reinforced concrete underground continuous wall.

[0018] The steel cage 1 includes a steel cage body 3, a lock body 4 and a lock 5; The reinforcement cage body 3 has a plurality of longitudinal and transverse force-bearing bars; A plurality of lock body parts 4 are fixedly connected to the ends of the steel cage body 3 in the extending direction; A plurality of locking members 5 are fixedly connected to one end of the reinforcement cage body 3 close to the preceding reinforcement cage 1 , and are used to lock with corresponding locking members 4 on the preceding reinforcement cage 1 .

[0019] In order to further optimize the above technical solution, a protrusion 6 is provided on the steel cage body 3 near one end of the preceding steel cage 1. After the positioning joint plate 2 is lifted and taken out, the protrusion 6 on the steel cage body 3 is filled into the protrusion hole; the front and rear ends of the steel cage body 3 are both provided with reinforcing ribs to improve stability.

[0020] In order to further optimize the above technical solution, the lock body 4 includes a connecting plate 7 fixedly connected to the steel cage body 3 and two locks 8 symmetrically fixed to the connecting plate 7. The two locks 8 and the connecting plate 7 together form a lock groove 12 structure.

[0021] In order to further optimize the above technical solution, a galvanized plate 9 for preventing bypass flow is further included, and a plurality of galvanized plates 9 for preventing bypass flow are respectively connected to a plurality of locking members 8. In this embodiment, the outer sides of the two locking members 8 are fixed with the galvanized plates 9 for preventing bypass flow in the concrete slot hole as required, so as to reduce the difficulty of lifting and unloading the positioning joint plate 2 due to bypass flow.

[0022] In order to further optimize the above technical solution, the locking member 5 includes a locking body 10 and a clamping member 11; The locking body 10 is a U-shaped structure fixedly connected to the steel cage body 3; There are two clamping members 11 , which are symmetrically connected to the open end of the locking body 10 ; the clamping members 11 are inserted into the locking groove 12 and are clamped and locked with the locking groove 12 .

[0023] In order to further optimize the above technical solution, a limiting sleeve 13 is further included, and a plurality of limiting sleeves 13 are symmetrically connected to the open end of the locking body 10. The limiting sleeve 13 is welded to the steel cage body 3, and the two longitudinal rods of the locking body 10 pass through the limiting sleeve 13 and are connected to the clamping member 11 respectively. The limiting sleeve 13 is used to limit the movement trajectory of the locking body 10 and improve stability.

[0024] The design and arrangement of the steel cage 1 are similar to the current steel cage 1, 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 the end or side lock body parts 4 and the locking parts 5, and the weld length between the force-bearing steel bars and the connecting steel plates meets the usual design requirements; the cage body welding of the steel cage 1 is carried out 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 plane and three-dimensional welding accuracy, and the welding direction arrangement of the lock body parts 4 and the locking parts 5 at the sides, ends, upper and lower parts must ensure that they can be locked front and back.

[0025] In order to further optimize the above technical solution, the positioning joint plate 2 includes a positioning protruding plate 14 and a joint member 15; The positioning protrusion 14 is a structure with a protrusion in the middle and flat ends; There are two connectors 15 , which are respectively fixed on the flat surfaces at both ends of the positioning protrusion 14 and are symmetrical with respect to the middle protrusion; the connectors 15 are placed in the locking groove 12 and locked with the locking groove 12 .

[0026] When the positioning joint plate 2 is lowered, a small hydraulic jack with a line can be simultaneously lowered, and the positioning joint plate 2 can be lifted and taken out by the hydraulic jack, which is easy to operate.

[0027] In this embodiment, the steel cage 1 arranged in the slot hole of the first-order underground continuous wall has lock body parts 4 welded at both ends of its steel cage body 3. After the lock body parts 4 are protected by the positioning joint plate 2, in the mud slot hole, after the second-phase concrete is poured, the first and second-order steel cages 1 are tightly connected vertically through the dedicated lock body parts 4 and the locking parts 5. The bottom of the lock body parts 4 of the first-order steel cage 1 can be welded with limiting treatment measures. After the second-order steel cage 1 is plugged and installed in place, the upper part can be welded and permanently fixed within the range of the slot hole; the vertical arrangement range of the lock body parts 4 can be arranged within a range greater than 3 meters below the bottom plate of the internal foundation pit excavation of the reinforced concrete underground continuous wall. , there is no need to lay out the entire slot; after the second-sequence concrete is poured, the reinforced concrete underground continuous wall joints are rigidly connected, providing better anti-seepage and force requirements, and realizing a more continuous and complete reinforced concrete underground continuous wall; the first and second-sequence steel cages 1 are tightly connected through the proprietary lock body parts 4 and the locking parts 5, 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 1, 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.

[0028] Before construction, prepare the mud mixing supply system, arrange the underwater concrete production and supply system, the steel cage 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 in the order of the above-mentioned construction method for constructing reinforced concrete underground continuous wall.

[0029] Through the above construction procedures, the construction of a complete tandem underground continuous wall is realized, and the construction of two unit rigid underground continuous walls is completed.

[0030] 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.

[0031] 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 method for constructing a reinforced concrete underground continuous wall, characterized in that: The following steps are involved: S1. Excavation of the first sequence of underground continuous wall slots is completed; S2. After the slot hole is cleaned, a steel cage is installed underneath, and positioning joint plates are installed at the front end of the steel cage and the end in the extension direction; S3, using conduit slurry to cast the first sequence underground continuous wall trench section; 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 positioning joint plate is lifted out, and the hole is measured and the hole cleaning is completed; S6, a subsequent steel cage is arranged and locked with the preceding steel cage, and a positioning joint plate is arranged at the end of the subsequent steel cage in the extension direction; S7, pouring the subsequent trench section, repeating steps S4-S6, and constructing a reinforced concrete underground continuous wall.

2. The construction method of a reinforced concrete underground continuous wall according to claim 1, characterized in that: The steel cage comprises a steel cage body, a lock body and a lock part; The steel cage body has a plurality of longitudinal and transverse force-bearing bars; The plurality of lock body parts are all fixedly connected to the ends of the reinforcement cage body in the extending direction; The plurality of locking members are all fixedly connected to one end of the reinforcement cage body close to the preceding reinforcement cage, and are used to lock with the corresponding locking body members on the preceding reinforcement cage.

3. A method for constructing a reinforced concrete underground continuous wall according to claim 2, characterized in that: A protrusion is provided on the main body of the steel cage, close to one end of the preceding steel cage.

4. The construction method of a reinforced concrete underground continuous wall according to claim 2, characterized in that: The lock body comprises a connecting plate fixedly connected to the main body of the steel cage and two locking pieces symmetrically fixed to the connecting plate. The two locking pieces and the connecting plate are combined to form a locking groove structure.

5. A method for constructing a reinforced concrete underground continuous wall according to claim 4, characterized in that: It also includes an anti-circumference galvanized plate, and a plurality of the anti-circumference galvanized plates are respectively connected to a plurality of the locking members.

6. A method for constructing a reinforced concrete underground continuous wall according to claim 4, characterized in that: The locking member comprises a locking body and a clamping member; The locking body is a U-shaped structure fixedly connected to the steel cage body; There are two clamping parts, which are symmetrically connected to the opening end of the locking body; the clamping parts are inserted into the locking groove and are clamped and locked with the locking groove.

7. A method for constructing a reinforced concrete underground continuous wall according to claim 6, characterized in that: It also includes a limiting sleeve, and a plurality of the limiting sleeves are symmetrically connected to the open end of the locking body.

8. The construction method of a reinforced concrete underground continuous wall according to claim 6, characterized in that: The positioning joint plate includes a positioning convex plate and a joint piece; The positioning convex plate is a structure with a raised middle and flat ends; There are two connectors, which are respectively fixed on the flat surfaces at both ends of the positioning convex plate and are symmetrical with respect to the middle protrusion; the connector is inserted into the locking groove and locked with the locking groove.

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