A digital diaphragm wall closed loop pouring system and construction method

Abstract

The application discloses a digital diaphragm wall closed-loop pouring system and a construction method, which comprises a concrete supply device, a central integrated control machine and at least one pouring unit in electric connection with the central integrated control machine, wherein the pouring unit comprises a pouring mechanism, a grouting mechanism and the central integrated control machine; the application adopts an active pressure pouring technology, and through a boosting mechanism such as a concrete pump or an air pressure boosting system, provides a continuous and controllable additional power for concrete flow, and replaces a traditional pouring mode which simply depends on the gravity of concrete. The fundamental change enables the concrete in the guide pipe to actively overcome greater mud static pressure and pipeline resistance, and thus completely solves the technical problems of poor concrete outflow, pipe blockage and even broken pile caused by excessive burying depth.

Description

Technical Field

[0001] This invention relates to the field of water conservancy and geological treatment technology, and particularly to the field of construction and pouring technology of anti-seepage walls, specifically to a digital diaphragm wall closed-loop pouring system and construction method. Background Technology

[0002] The quality of concrete pouring for diaphragm walls directly determines their final performance as seepage barriers or load-bearing structures. Currently, the tremie pipe replacement method is commonly used in this field: the tremie pipe is lowered to the bottom of the borehole, and the initial grouting is achieved by the weight of the concrete itself overcoming the pressure of the mud inside the pipe. During the pouring process, the appropriate burial depth of the concrete under the mud is maintained by disassembling the tremie pipe section by section.

[0003] However, this traditional gravity-based casting method suffers from a core technical problem that has long remained unresolved: controlling the timing and height of pipe extraction is extremely difficult and has a very low margin for error. Specifically: Pulling the conduit too late or at insufficient height will result in excessive static pressure of mud that the concrete inside the conduit must overcome, also known as "burial depth pressure." When this pressure exceeds the weight of the concrete itself, the concrete will not be able to flow smoothly from the bottom of the conduit, causing construction interruptions such as "conduit blockage" or "casting," and leading to fatal defects such as mud inclusions in the wall and broken piles.

[0004] Pulling the conduit too early or at too high a height can cause the bottom of the conduit to detach from the poured concrete surface, allowing concrete from a higher position to directly flow into the slurry, resulting in severe mixing of the concrete and slurry. This not only creates a loose interlayer with extremely low strength and high permeability, severely affecting the integrity and waterproofing performance of the wall, but this defect is also hidden, irreversible, and unrecoverable.

[0005] Although construction specifications have clear requirements for the burial depth of the guide pipe, in complex working conditions such as deep holes, ultra-deep holes, or fluctuating mud properties, relying solely on the experience of construction personnel to judge and control the pipe extraction process is extremely risky. Most existing so-called automated pouring systems merely add data monitoring to the gravity pouring framework, without changing their inherently "passive" reliance on the concrete's own weight, thus failing to fundamentally solve the aforementioned "pipe extraction dilemma." Summary of the Invention

[0006] This application provides a digital diaphragm wall closed-loop casting system and construction method to replace existing cutoff wall casting technology. It primarily addresses the problem of poor accuracy in judging the timing and height of pipe extraction during the cutoff wall casting process. Existing cutoff wall casting requires operators to rely on their casting experience and data from sensors underground to make comprehensive judgments about the burial depth of the casting pipe. This is highly dependent on and uncertain in terms of operator experience and responsibility. Furthermore, for deep-seated construction, the accuracy of sensors is affected by mud and high-pressure environments. Data distortion can lead to misjudgments, resulting in irreversible mud-concrete mixing defects in the cutoff wall. To address this drawback, this invention fundamentally abandons the inventive concept of installing sensors below the stratum to collect data such as concrete pouring depth and concrete interface. Instead, it adopts a completely opposite technical approach, using only flow, level, and / or weighing sensors installed on the ground to calculate the flow / volume of mud and concrete, thereby deducing the burial depth of the pouring pipe below the foundation. Simultaneously, by combining pressure conveying with the existing gravity conveying method, it can further overcome the problems of high requirements for pipe pulling timing and height, significantly improving the margin for error.

[0007] To achieve the above objectives, the technical solution adopted in this application is as follows: A digital diaphragm wall closed-loop pouring system includes a concrete supply device, a central integrated control unit, and at least one pouring unit electrically connected to the central integrated control unit, wherein the pouring unit includes... The pouring mechanism includes a concrete supply device and a concrete storage and distribution device for receiving and distributing concrete. The concrete storage and distribution device has at least one discharge port connected to a pouring pipe. A device for collecting the concrete pouring flow rate is also provided between the discharge port and the pouring pipe. The flow meter A, and the booster mechanism for increasing the concrete supply pressure; The slurry pumping mechanism includes a slurry pump and a slurry storage tank connected in sequence, as well as a slurry recovery pipeline for collecting the slurry recovery flow rate. Flow meter B; The central integrated control unit collects real-time data on the remaining concrete volume in the concrete storage and distribution device. Concrete pouring flow rate Mud recovery flow rate Control commands are sent to both the pressurizing mechanism and the pumping mechanism to ensure that the pressurizing mechanism continuously supplies concrete and that the pumping mechanism simultaneously recovers the slurry and meets the requirements. and Until the concrete pouring flow rate of the xth joint pile hole / groove = ;in, It is a preset minimum concrete allowance. This is the theoretical concrete pouring volume for the xth joint pile hole / groove, in meters; k It is the overflow prevention coefficient. k =0.8-0.99.

[0008] Preferably, the concrete storage and distribution device includes a storage silo for temporarily storing concrete and which can be sealed or has an open top, and a device for collecting the remaining amount of concrete. The sensing unit includes a level gauge installed inside the storage silo for detecting the concrete level and / or a weighing sensor installed at the bottom of the storage silo.

[0009] Preferably, the pressurizing mechanism adopts a mechanical pressurizing structure, including a concrete pump installed between the discharge port and the pouring pipe.

[0010] Preferably, the pressurization mechanism is a pneumatic pressurization mechanism, including an air compressor, a pressure tank, and an air supply pipe connected in sequence. The air supply pipe is equipped with a solenoid valve for connecting to and supplying compressed air to the storage silo. At least one outlet for connecting to the casting pipe is installed at the bottom of the storage silo. A first pressure relief valve is installed at the top of the storage silo. The air compressor, the solenoid valve, and the first pressure relief valve are all electrically connected to the central integrated control unit.

[0011] Preferably, the concrete storage and distribution device includes two storage bins, a first storage bin and a second storage bin, connected at their bottoms by electric valves, and a first pressure relief valve and a second pressure relief valve respectively disposed at the top of the first storage bin and the second storage bin; the pressurization mechanism is a pneumatic pressurization mechanism, including an air compressor, a pressure tank, and an air supply pipe connected in sequence, the other end of the air supply pipe being connected to the first storage bin and the second storage bin near the top via two parallel first solenoid valves and a second solenoid valve respectively, and the bottom of the first storage bin and / or the second storage bin is provided with an outlet for connecting a pouring pipe.

[0012] A digital diaphragm wall closed-loop construction method includes the following steps: Step STP100: Surface grid construction. Plan a seepage prevention zone M on the surface. Within the seepage prevention zone M, set up positioning trenches with intersecting horizontal and vertical lines. The width of the positioning trenches shall not be less than 0.6m and the depth shall not be less than 0.2m. Excavate joint pile holes at the intersection of the positioning trenches to the preset seepage prevention wall depth. Step STP200: Hole cleaning and slag removal. Place the hole cleaning device into the joint pile hole, immerse it in the mud, and lower it to the bottom of the hole. Then, raise it at the same speed of 0.5-1m / min to clean the bottom of the hole to a height of 5-10 meters. Step STP300, integral casting, using the digital diaphragm wall closed-loop casting system as described in any one of claims 1-5 to cast one or more joint pile holes until the casting of all joint pile holes is completed. Step STP400: Trenching excavation. Using a dual-wheel milling machine, trenches are excavated along the positioning groove to the strata between two adjacent joint piles until the joint installation depth or a preset depth is obtained to form the trench. Step STP500: Tank cleaning. Use a wheel brush device to clean the surface of the tank and the joint piles at both ends. Then repeat step STP300 to pour the entire cleaned tank as a whole until all tanks are poured.

[0013] Beneficial effects: 1. This invention employs active pressure casting technology, which provides continuous and controllable additional power for concrete flow through a pressurization mechanism, such as a concrete pump or a pneumatic pressurization system, replacing the traditional casting mode that relies solely on the gravity of concrete. This fundamental change enables the concrete inside the tremie pipe to actively overcome greater slurry static pressure and pipeline resistance, thereby completely solving the technical problems of poor concrete flow, pipe blockage, and even pile breakage caused by excessive burial depth.

[0014] 2. This invention employs a combination of pressure casting and closed-loop control, allowing the duct to remain inside the concrete for a longer period without the need for hasty removal. This significantly relaxes the stringent requirements on the timing and height of duct removal, substantially improving construction tolerance. Construction workers no longer need to navigate the difficult and dangerous balance between the risk of duct blockage and the risk of concrete segregation, fundamentally avoiding fatal defects such as concrete mixing with slurry and the formation of mud inclusions in the wall due to excessively high or premature duct removal, thus ensuring the uniformity, density, and overall continuity of the diaphragm wall.

[0015] 3. This invention employs real-time linkage control technology between concrete pouring flow rate and mud recovery flow rate, which satisfies... This achieves a dynamic balance between pouring and recycling. This not only effectively prevents overflow at the orifice and maintains stable mud pressure inside the orifice, but also creates a stable working environment for pressure pouring, ensuring the smooth rise of concrete and the smooth discharge of mud under controllable pressure.

[0016] 4. This invention adopts a modular and digitally integrated system design, organically integrating pressure supply, storage monitoring, flow metering, and central control. This system can adapt to the high-thrust scenarios of mechanical booster (concrete pumps) and also achieve gentler, more closed-loop delivery through pneumatic booster. In particular, the dual-compartment design supports the switching of different grades of concrete or continuous, uninterrupted pouring, greatly enhancing the applicability and reliability of the system in complex engineering projects. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of a diaphragm wall.

[0019] Figure 2 This is a schematic diagram of the trench excavation.

[0020] Figure 3 This is a schematic block diagram of the system and connection relationships of the present invention.

[0021] Figure 4 This is a schematic diagram of an embodiment of a pneumatic booster structure.

[0022] Figure 5 This is a schematic diagram of another embodiment of the air pressure boosting structure.

[0023] Figure 6 This is a schematic diagram of the casting of the joint pile hole.

[0024] In the diagram: 1-Positioning groove; 2-Joint pile hole; 21-Trench body; 3-Double wheel milling machine; 4-Concrete supply device; 5-Concrete storage and distribution device; 6-Pressure boosting mechanism; 7-Pouring pipe; 8-Pipe pulling machine; 9-Flow meter A; 61-Air compressor; 62-Air tank; 63-Air supply pipe; 64-1-First solenoid valve; 64-2-Second solenoid valve; 65-First storage bin; 66-First pressure relief valve; 67-Second storage bin; 68-Second pressure relief valve; 69-Electric valve; 71-First casting pipe; 72-Second casting pipe. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] In the description of this application, it should be noted that the use of terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product is in use. These terms are used solely for the convenience of describing this application and for simplifying the description, and do not 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 limitations on this application. Furthermore, the use of terms such as "first" and "second" in the description of this application is only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of this application does not imply that the component is required to be absolutely horizontal or suspended, but rather that it may be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it may be slightly tilted.

[0030] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0031] Example 1: This embodiment provides a digital diaphragm wall closed-loop casting system. The system architecture is described below. Figure 3 As shown, it includes a concrete supply device 4, a central integrated control unit, and at least one pouring unit electrically connected to the central integrated control unit, the pouring unit including... The pouring mechanism includes a concrete supply device 4 and a concrete storage and distribution device 5 for receiving and distributing concrete. The concrete storage and distribution device 5 has at least one discharge port, which is connected to a pouring pipe 7. A device for collecting the concrete pouring flow rate is also provided between the discharge port and the pouring pipe 7. The system includes a flow meter A9 and a booster mechanism 6 for increasing concrete supply pressure. Notably, the central integrated control unit can simultaneously control multiple electrically connected pouring units, enabling integrated intelligent pouring of multiple areas at different stages of the process. The processes of each pouring unit can be independent and will not interfere with each other. See also... Figure 1 As shown, multiple joint pile holes 2 can be poured simultaneously, and the ground data monitoring for the pouring of each structural pile hole 2 is independent. Therefore, compared with the existing anti-seepage wall pouring, it is more efficient.

[0032] The slurry pumping mechanism includes a slurry pump and a slurry storage tank connected in sequence, as well as a slurry recovery pipeline for collecting the slurry recovery flow rate. The flow meter B; This embodiment is based on the concept of constant volume, coordinating the supply of concrete and the recovery of mud. Since the volume of the joint pile hole 2 or the trench 21 being poured is constant and does not change during pouring, when a certain volume of concrete is injected into the joint pile hole 2 or the trench 21, an equal volume of mud will overflow. To avoid mud overflow and waste, and to prevent environmental pollution, and to avoid the risk of hole collapse caused by a significant drop in the mud level in the joint pile hole 2 or the trench 21 due to excessively fast mud recovery, it is necessary to measure the mud recovery flow rate of the joint pile hole 2 or the trench 21 currently at number x. With concrete pouring flow rate This matching ensures that the mud level remains at the surface with only minor fluctuations, achieving the dual effect of stabilizing the bottom borehole wall, preventing borehole collapse, and avoiding mud overflow and waste during pouring.

[0033] The central integrated control unit collects real-time data on the remaining concrete volume within the concrete storage and distribution device 5. Concrete pouring flow rate Mud recovery flow rate Control commands are sent to the pressurizing mechanism 6 and the pumping mechanism respectively, so that the pressurizing mechanism 6 continuously supplies concrete, and the pumping mechanism simultaneously recovers the mud and meets the requirements. and Until the concrete pouring flow rate of the xth joint pile hole 2 / trench 21 = ;in, It is a preset minimum concrete allowance. This is the theoretical concrete pouring volume for the xth joint pile hole 2 / trench 21, in meters. 3 ; k It is the overflow prevention coefficient. k =0.8-0.99.

[0034] This embodiment will illustrate the control logic of the central integrated control unit using a single pouring unit as an example: This embodiment uses concrete flow rate to calculate the cumulative volume of poured concrete. Since the shape of the joint pile hole 2 / trench 21 is regular, usually cylindrical or rectangular, given the known bottom area, the pouring thickness of the concrete in the joint pile hole 2 / trench 21 can be calculated, thereby calculating the current embedment depth of the pouring pipe in the concrete. The specific calculation process is as follows: The theoretical concrete pouring volume for the current joint pile hole 2 / trench 21 is determined by inputting data via human body input devices or a digital touchscreen to the central integrated control unit. This will be illustrated using joint pile hole 2 as an example. The bottom area of ​​the current joint pile hole 2 is set as... Unit m 2 Depth is The unit is meters (m). Theoretical concrete pouring volume for the xth joint pile hole 2 So, what is the burial depth of the casting pipe at time t? ;in, The initial gap between the casting pipe and the bottom of the joint pile hole 2 before extraction, in meters; Here, is the height of a single pipe pull, 'n' is the number of pipe pulls completed, and 'i' represents the number of pipe pulls at time 't'. The system can then calculate the current pipe burial depth based on the actual amount of concrete poured at time 't', and then prompt the operator according to the system's preset pipe burial depth range or directly send a pipe pull drive command to the pipe puller 8. The mud recovery flow rate... Controlled to a flow rate slightly greater than that of concrete pouring The purpose is to prevent mud overflow; a small drop in the mud level will not cause borehole wall collapse, thus ensuring accurate mud recovery and construction stability. One of the prerequisites for the system to operate is... The goal is to ensure that there is always sufficient excess concrete during the pouring process, once the system's preset minimum value is reached. In this case, the entire system will suspend operation and issue an alarm, prompting the system to supply concrete as soon as possible via concrete supply device 4. See also... Figure 1As shown, this invention supports two supply methods: intermittent supply, such as supplying in batches via mixer trucks or mixers; and continuous supply, such as direct supply from a mixing plant. Generally, a mixing plant is set up at the pouring site, and its layout can be determined according to actual construction needs.

[0035] Example 2: This embodiment optimizes the data acquisition method based on embodiment 1. Specifically, the concrete storage and distribution device 5 includes a storage silo for temporarily storing concrete that can be sealed or opened at the top, and a device for collecting the remaining amount of concrete. The sensing unit includes a level gauge installed inside the storage silo for detecting the concrete level and / or a weighing sensor installed at the bottom of the storage silo. The level gauge method calculates the remaining concrete volume based on volume = bottom area * liquid level; the weighing sensor method calculates the remaining concrete volume based on volume = mass / density. Those skilled in the art can flexibly choose a suitable layout. Of course, under the disclosure and inspiration of this embodiment, both methods can also be used for data acquisition, either by averaging or by determining the final value according to priority. Setting two data acquisition methods can improve system stability and provide mutual backup; furthermore, simultaneous activation can improve calculation accuracy and enhance the precision of the remaining concrete volume.

[0036] Example 3: This embodiment further optimizes any of the above embodiments. The pressurization mechanism 6 adopts a mechanical pressurization structure, including a concrete pump installed between the discharge port and the pouring pipe 7. Using a concrete pump for pressurization is the most direct and fastest method, but energy consumption increases with the number of concrete pumps; without adding a concrete pump, the efficiency of construction pouring cannot be significantly improved. The operation of the concrete pump is based on the actual concrete pouring flow rate. In other words, whether the total amount of concrete already poured has reached the theoretical amount of concrete to be poured. Start / stop commands are sent by the central integrated control unit.

[0037] Example 4: This embodiment also provides another adding mechanism 6, which can be found in the appendix of the specification. Figures 4-5As shown, the pressurization mechanism 6 is a pneumatic pressurization mechanism, including an air compressor 61, a pressure tank 62, and an air supply pipe 63 connected in sequence. The air supply pipe 63 is equipped with a solenoid valve for connecting to and supplying compressed air to the storage silo. At least one outlet for connecting to the pouring pipe 7 is installed at the bottom of the storage silo. A first pressure relief valve 66 is installed at the top of the storage silo. The air compressor 61, the solenoid valve, and the first pressure relief valve 66 are all electrically connected to the central integrated control unit. This method, due to the limited capacity of the storage silo requiring replenishment, cannot achieve continuous pouring from beginning to end. When the actual pouring volume reaches the maximum storage capacity of the storage silo, no more concrete needs to be added. At this point, the solenoid valve needs to be closed to block the supply of high-pressure gas from the pressure tank 62, while the first pressure relief valve 66 is opened to reduce the air pressure in the storage silo to standard atmospheric pressure. Then, the storage silo is opened to replenish concrete, and then the storage silo is sealed again, the first pressure relief valve 66 is closed, the solenoid valve is opened to supply pressure, and the pressurized pouring state is restored.

[0038] Example 5: To achieve continuous supply based on the above-mentioned pneumatic pressurization method, this embodiment improves upon embodiment 4 and provides a more preferred structure as another continuous pouring method. The concrete storage and distribution device 5 includes two storage bins, a first storage bin 65 and a second storage bin 67, whose bottoms are connected by an electric valve 69, and a first pressure relief valve 66 and a second pressure relief valve 68 respectively located at the top of the first storage bin 65 and the second storage bin 67. The pressurization mechanism 6 adopts a pneumatic pressurization mechanism, including an air compressor 61, a pressure tank 62, and an air supply pipe 63 connected in sequence. The other end of the air supply pipe 63 is connected to the first storage bin 65 and the second storage bin 67 near the top through two parallel first solenoid valves 64-1 and second solenoid valves 64-2 respectively. The bottom of the first storage bin 65 and / or the second storage bin 67 is provided with an outlet for connecting the pouring pipe.

[0039] See further Figures 4-5 As shown, both this embodiment and Embodiment 4 are based on the principle of gas-assisted casting to replace the existing gravity casting. However, this embodiment is significantly superior to Embodiment 4 in terms of casting supply efficiency, achieving uninterrupted casting supply. The principle of continuous casting is as follows: Taking the first storage silo 65 as the main pouring silo as an example, when the concrete in the first storage silo 65 reaches the lower limit, the system will close the second solenoid valve 64-2 and the electric valve 69, so that the first storage silo 65 can continue to be pressure poured under the pressure of the pressurizing mechanism 6. At this time, the second pressure relief valve 68 is opened to release the pressure of the second storage silo 67, and the second storage silo 67 is opened to receive concrete from the concrete supply device 4. After the supply is completed, the second storage silo 67 is closed, the second pressure relief valve 68 is closed, the first solenoid valve 64-1 is closed, and the second solenoid valve 64-2 and the electric valve 69 are opened, so that the newly added concrete can enter the first storage silo 65 under the push of air pressure to supplement the concrete required for pouring, thereby achieving continuous pouring. Of course, as an optional control mode, the first pressure relief valve 66 can also be opened to reduce the air pressure in the first storage silo 65, quickly moving the concrete from the second storage silo 67 to the first storage silo 65, and then the first pressure relief valve 66 can be closed. It is worth noting that due to the compressibility of air, it is only necessary to open the first pressure relief valve 66 for about 1-2 minutes, without waiting for all the air in the first storage silo 65 to be expelled by the concrete before closing it. Even if the first storage silo 65 is in a near-empty state, under standard atmospheric pressure conditions, the space occupied by the stored air after reaching the working pressure is extremely limited and will not affect the concrete entering the first storage silo 66.

[0040] See Figure 4 As shown, in actual supply, concrete can be supplied simultaneously by the first storage silo 65 and the second storage silo 67; or only the first storage silo 65 can perform the pouring, and the second storage silo 687 can serve as a receiving and conversion device for continuous supply of concrete.

[0041] Example 6: A digital diaphragm wall closed-loop construction method includes the following steps: Step STP100: Surface grid construction. A seepage prevention zone M is planned on the surface. Positioning trenches 1 are dug in a horizontal and vertical pattern within seepage prevention zone M. The width of each positioning trench 1 is not less than 0.6m, and the depth is not less than 0.2m. Joint pile holes 2 are excavated at the intersection of the positioning trenches 1 to the predetermined depth of the seepage prevention wall. (See also...) Figure 1 As shown; Step STP200: Clean the hole and remove slag. Place the cleaning device into the joint pile hole 2, immerse it in the mud and lower it to the bottom of the hole. Then, raise it at the same speed of 0.5-1m / min to clean the bottom of the hole to a height of 5-10 meters. Step STP300, integral casting, using the digital diaphragm wall closed-loop casting system as described in any one of claims 1-5 to cast one or more of the joint pile holes 2 until the casting of all joint pile holes 2 is completed. Step STP400: Trenching excavation. Using a twin-wheel milling machine 3, trenches are excavated along the positioning groove 1 between two adjacent joint piles to the joint installation depth or a preset depth to obtain the trench body 21; see [link to relevant documentation]. Figure 2 As shown; Step STP500: Tank cleaning. Use a wheel brush device to clean the surface of the tank and the joint piles at both ends. Then repeat step STP300 to pour the concrete into any one of the cleaned tanks 21 as a single piece, until all tanks 21 are poured. (Participate) Figure 6 As shown.

[0042] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A digital diaphragm wall closed-loop pouring system, comprising a concrete supply device (4), a central integrated control unit, and at least one pouring unit electrically connected to the central integrated control unit, characterized in that, The casting unit includes The pouring mechanism includes a concrete supply device (4) and a concrete storage and distribution device (5) for receiving and distributing concrete. The concrete storage and distribution device (5) has at least one discharge port connected to a pouring pipe (7). A device for collecting concrete pouring flow rate is also provided between the discharge port and the pouring pipe (7). The flow meter A (9) and the booster mechanism (6) for increasing the concrete supply pressure. The slurry pumping mechanism includes a slurry pump and a slurry storage tank connected in sequence, as well as a slurry recovery pipeline for collecting the slurry recovery flow rate. Flow meter B; The central integrated control unit collects the residual concrete volume in the concrete storage and distribution device (5) in real time. Concrete pouring flow rate Mud recovery flow rate Control commands are sent to the pressurizing mechanism (6) and the pumping mechanism respectively, so that the pressurizing mechanism (6) continuously supplies concrete, and the pumping mechanism simultaneously recovers the mud and meets the requirements. and The concrete pouring flow rate up to the xth joint pile hole (2) / trench (21) = ;in, It is a preset minimum concrete allowance. This is the theoretical concrete pouring volume for the xth joint pile hole (2) / trench (21), in meters. 3 ; k It is the overflow prevention coefficient. k =0.8-0.

99.

2. The digital diaphragm wall closed-loop casting system according to claim 1, characterized in that: The concrete storage and distribution device (5) includes a storage silo for temporarily storing concrete and which can be sealed or opened at the top, and a silo for collecting the remaining amount of concrete. The sensing unit includes a level gauge installed inside the storage silo for detecting the concrete level and / or a weighing sensor installed at the bottom of the storage silo.

3. The digital diaphragm wall closed-loop casting system according to claim 1, characterized in that: The pressurization mechanism (6) adopts a mechanical pressurization structure, including a concrete pump installed between the discharge port and the pouring pipe (7).

4. The digital diaphragm wall closed-loop casting system according to claim 2, characterized in that: The pressurization mechanism (6) is a pneumatic pressurization mechanism, including an air compressor (61), a pressure tank (62), and an air supply pipe (63) connected in sequence. The air supply pipe (63) is equipped with a solenoid valve for connecting to and supplying compressed air to the storage silo. The bottom of the storage silo is equipped with at least one outlet for connecting to the casting pipe (7). The top of the storage silo is equipped with a first pressure relief valve (66). The air compressor (61), the solenoid valve, and the first pressure relief valve (66) are all electrically connected to the central integrated control electromechanical system.

5. A digital diaphragm wall closed-loop casting system according to claim 2, characterized in that: The concrete storage and distribution device (5) includes a first storage silo (65) and a second storage silo (67) connected at the bottom by an electric valve (69), and a first pressure relief valve (66) and a second pressure relief valve (68) respectively installed at the top of the first storage silo (65) and the second storage silo (67); the pressurization mechanism (6) adopts a pneumatic pressurization mechanism, including an air compressor (61), a pressure tank (62), and an air supply pipe (63) connected in sequence. The other end of the air supply pipe (63) is connected to the first storage silo (65) and the second storage silo (67) near the top through two parallel first solenoid valves (64-1) and second solenoid valves (64-2). The bottom of the first storage silo (65) and / or the second storage silo (67) is provided with an outlet for connecting the pouring pipe.

6. A digital diaphragm wall closed-loop construction method, characterized in that: Includes the following steps Step STP100: Surface grid construction. Plan a seepage prevention area M on the surface. In the seepage prevention area M, open positioning grooves (1) with horizontal and vertical intersections. The width of the positioning grooves (1) is not less than 0.6m and the depth is not less than 0.2m. Excavate joint pile holes (2) at the intersection of positioning grooves (1) to the preset seepage prevention wall depth. Step STP200, cleaning the hole and removing slag, put the cleaning device into the joint pile hole (2), and immerse it in the mud and lower it to the bottom of the hole. Then, raise it at the same speed of 0.5-1m / min to clean the bottom of the hole to a height of 5-10 meters. Step STP300, integral casting, using the digital diaphragm wall closed-loop casting system as described in any one of claims 1-5 to cast one or a batch of the joint pile holes (2) until the casting of all joint pile holes (2) is completed; Step STP400, trench excavation, using a double wheel milling machine (3) to excavate the strata between two adjacent joint piles along the positioning groove (1) to the joint installation depth or preset depth to obtain the trench body (21). Step STP500, tank cleaning, use a wheel brush device to clean the surface of the tank and the joint piles at both ends, then repeat step STP300 to pour the entire cleaned tank (21) together until all tanks (21) are poured.

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