Water-rich sand layer underground continuous wall joint box system and construction method thereof

Abstract

The present invention relates to a water-rich sand layer underground continuous wall joint box system and a construction method thereof, belonging to the field of underground continuous wall construction. The system includes: a multi-section combined box body, a hydraulic positioning unit, a hydraulic stripping unit, and a flushing and brushing unit. The completion of the reset of the hydraulic positioning unit is the starting condition of the hydraulic stripping unit; the initial working start time of the flushing and brushing unit is before the hydraulic positioning unit performs the reset operation, which is used to clean the concrete around the positioning clip; the secondary working start time of the flushing and brushing unit is during the period when the multi-section combined box body is pulled out, which is used to clean the concrete in the groove structure. The construction method includes: installing a rubber water stop and fixing the water stop by the positioning clip; hoisting the box body to the slot section joint position to form an anti-circumvention wall structure; releasing the clamping force of the positioning clip during the initial setting stage of the concrete; starting the graded loading program of the hydraulic stripping unit; and starting the flushing and brushing unit to perform dynamic flushing treatment during the lifting process of the box body.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of civil engineering underground continuous wall construction, and particularly relates to a water-rich sand layer underground continuous wall joint box system and a construction method thereof. BACKGROUND

[0002] In the field of civil engineering underground continuous wall construction, water-rich sand layers become a complex environment for underground continuous wall joint construction due to their geological characteristics of high permeability and low cohesion. The cementation between sand particles in this type of stratum is weak, and under dynamic water pressure, it is prone to erosion and sand flow, resulting in poor stability of the trench wall. This poses higher requirements for the positioning accuracy, impermeability and structural rigidity of underground continuous wall joints.

[0003] Currently, traditional underground continuous wall joint technology faces significant technical challenges in water-rich sand layers. The lock pipe joint relies on mud protection to achieve positioning, but mud protection in water-rich sand layers is prone to failure, resulting in large positioning deviations and insufficient density after concrete pouring, significantly increasing the risk of leakage. The I-beam joint can extend the water flow path to some extent, but the interface between steel and concrete is prone to micro-cracks under sand particle erosion, and corrosion of steel in a water-rich environment affects the durability of the structure. The cross steel plate joint has the advantage of rigid connection, but the welding process is prone to stress concentration under the dynamic stress conditions of water-rich sand layers, and the risk of welding defects is high.

[0004] CN118292495A discloses an improved method for preventing flow around a joint box of a rubber waterstop for an underground continuous wall; including steps 1, trenching for an underground continuous wall; step 2, ultrasonic detection of the trench; step 3, lowering a reinforcement cage into the trench; step 4, lowering the joint box and adjusting it according to the ultrasonic detection data; step 5, pouring concrete into the trench; step 6, stripping the joint box; wherein the joint box comprises a joint box body and brushes arranged on both sides of the joint box body.

[0005] CN110387876A discloses a construction method for installing a rubber waterstop in an automatically folding joint box for an underground continuous wall, including steps of guide wall construction, trench excavation, reinforcement cage binding and lowering, joint box assembly and installation, concrete pouring, and shrinking the joint box and hoisting it out; the back plate, rear side plate, front side plate and front plate of the joint box are hingedly connected to each other and are sealed with a strip-shaped waterstop, a plurality of folding hydraulic arms are arranged between the rear side plates, a plurality of rubber waterstop clamping devices and clamping hydraulic arms are arranged on the front plate, the folding hydraulic arms and the clamping hydraulic arms are connected to a hydraulic pump through independent hydraulic pipes, and the joint box is connected as a whole through fastening tie rods; after the concrete of the underground continuous wall reaches a certain strength, the folding hydraulic arms and the clamping hydraulic arms are simultaneously shrunk and extended, the joint box is shrunk and folded as a whole, the clamping devices release the rubber waterstop, and the joint box is hoisted out.

[0006] CN108677923A discloses an expansion type underground continuous wall construction joint box and a construction method thereof, comprising a joint box, expansion mechanisms arranged on both sides and the bottom of the joint box; the joint box is installed between the groove walls through the expansion mechanisms of the four sides; a water stop plate connecting piece is arranged on one side of the joint box; a joint box connecting bolt is arranged on the water stop plate connecting piece, and a water stop plate clamping groove is formed in the side surface of the water stop plate connecting piece, and the water stop plate is inserted into the water stop plate clamping groove.

[0007] At the construction process level, the prior art has obvious shortcomings: when the traditional joint box is removed, the adsorption of the water-rich sand layer causes the friction resistance to increase significantly, which easily causes the deformation of the box body; during the installation of the joint, the control of the trenching accuracy of the water-rich sand layer is difficult, and the verticality deviation easily causes the joint anti-seepage performance to decrease; the concrete face brushing wall operation is difficult to effectively remove the residues in the sand layer, and the residual impurities easily form a leakage channel. In addition, the conventional joint box structure is insufficient in rigidity under the action of the high side pressure of the water-rich sand layer, and is easily deformed, which causes the positioning of the rubber water stop belt to fail or tear, and affects the overall anti-leakage effect of the joint.

[0008] The above problems cause the existing underground continuous wall joint technology to have systematic defects such as insufficient positioning accuracy, weak anti-seepage performance, and low construction process reliability in the water-rich sand layer, and it is difficult to meet the requirements of safety, durability and construction efficiency of the project, and it is urgent to develop a new type of underground continuous wall joint system and construction method suitable for the characteristics of the water-rich sand layer.

[0009] In addition, on the one hand, there are differences in the understanding of those skilled in the art; on the other hand, a large number of literatures and patents have been studied by the applicant when making the present application, but all the details and contents have not been listed in detail due to the limited space, which does not mean that the present application does not have these characteristics of the prior art, on the contrary, the present application has all the characteristics of the prior art, and the applicant reserves the right to add related prior art in the background art. SUMMARY

[0010] In view of the deficiencies of the prior art, the present application provides a water-rich sand layer underground continuous wall joint box system and a construction method thereof, to solve at least part of the above technical problems.

[0011] The application discloses a water-rich sand layer underground continuous wall joint box system, which comprises a multi-section combined box body used for forming a modular rigid support structure of an underground continuous wall joint, a hydraulic positioning unit used for fixing a rubber waterstop through a first jacking rod and a positioning clamp, a hydraulic stripping unit used for separating the multi-section combined box body from the poured concrete through a second jacking rod, and a flushing wall cleaning unit used for cleaning residues on the concrete surface through a nozzle.

[0012] The application solves the technical problems of poor sealing, large stripping resistance and difficult residue removal in the underground continuous wall joint construction in the water-rich sand layer environment by the cooperative work of the multi-section combined box body, the hydraulic positioning unit, the hydraulic stripping unit and the flushing wall cleaning unit.

[0013] According to a preferred embodiment, the multi-section combined box body comprises a plurality of splicable modular box sections, which are divided into top boxes, standard boxes and bottom boxes, and adjacent box sections can be detachably fixed through the cooperation of connecting pieces and connecting holes.

[0014] The application solves the problems of single structure and poor construction adaptability of the traditional joint box system by the layered design of the modular box sections (top box, standard box, and bottom box) and the cooperation of the connecting pieces and connecting holes. The design of the lifting rod and lifting ring on the top of the top box, combined with the bolt connection mode of the standard box and the bottom box, realizes the rapid assembly and disassembly of the box body, significantly improving the construction efficiency; the oblique notch structure at the bottom of the bottom box can facilitate the insertion of the multi-section combined box body into the soil based on its own gravity, reduce the frictional resistance when the box is pulled out by reducing the contact area with the soil, and balance the internal and external air pressure through the setting of the air vent, further reducing the interference of the vacuum adsorption force on the stripping operation; the differential functional configuration of the top box and the bottom box (the top box focuses on lifting, and the bottom box focuses on stripping), combined with the universal design of the standard box, makes the whole system adapt to the needs of different construction stages. In addition, the replaceability of the modular box sections reduces the equipment maintenance cost and avoids the overall scrapping caused by local damage.

[0015] According to a preferred embodiment, the box section of the multi-section combined box body comprises a three-layer structure, the first layer is a hydraulic area, the second layer is a pipeline area, and the third layer is a maintenance area, the three-layer structure is connected in sequence and gradually widened, forming a ladder-shaped structure; the multi-section combined box body is arranged with the hydraulic area close to the reinforcement cage and the maintenance area close to the backfill soil during lifting.

[0016] The three-layer structure (hydraulic area, pipeline area, and maintenance area) gradually widened design optimizes the internal space layout of the box body, solves the problem of chaotic functional partition and inconvenient maintenance of the traditional box body. The arrangement of the hydraulic area close to the reinforcement cage makes the working area of the hydraulic positioning unit and the stripping unit directly contact with the concrete pouring surface, improving the accuracy of the water stop belt fixing and stripping operation; the setting of the maintenance area close to the backfill soil facilitates the maintenance of abnormal parts by the construction personnel through the maintenance opening with a cover plate, avoiding the influence of maintenance operation on the concrete pouring progress. The ladder-shaped design of the three-layer structure reduces the risk of stress concentration through gradual widening transition, and provides an independent second cavity for the clamp oil pipe, stripping oil pipe, and flushing pipeline of the pipeline area, avoiding pipeline cross interference and ensuring the stability of the hydraulic system. This layered design also reduces the probability of construction interruption caused by pipeline blockage or hydraulic component failure by reserving maintenance space.

[0017] According to a preferred embodiment, the hydraulic area is configured with two first cavities that are independent of each other and have a certain gap, the gap is configured as a groove structure for setting the water stop belt, wherein the water stop belt can be fixed in the groove structure by the action force of the first top rod and the positioning clamp of the hydraulic positioning unit.

[0018] The present application solves the technical problem that the water stop belt in water-rich sand layer is easy to be displaced or embedded shallowly by the double-cavity structure and groove design in the hydraulic area. The gap between the double cavities forms a groove structure, which provides physical limiting space for the rubber water stop belt, avoiding its deviation due to lateral pressure during concrete pouring. The width and depth of the groove are designed to be slightly smaller than the aperture of the water stop belt and slightly larger than the embedded segment width, further enhancing the embedding stability of the water stop belt and ensuring its close fit with the concrete interface. The hydraulic positioning unit applies controllable pressure to embed the water stop belt in the groove through the cooperative action of the first top rod and the positioning clamp, avoiding excessive extrusion pressure that causes deformation of the water stop belt, and ensuring sufficient embedding depth to achieve sealing effect. This design is particularly suitable for high-permeability geological conditions in water-rich sand layers, effectively preventing mud leakage and ensuring the long-term durability of the underground diaphragm wall joint.

[0019] According to a preferred embodiment, the pipeline area is configured with a second cavity for accommodating the clamp oil pipe, the stripping oil pipe and the flushing pipeline, wherein the clamp oil pipe and the stripping oil pipe each contain at least two oil pipes, one for pressurized lifting and the other for pressure recovery, and the clamp oil pipe is connected to the clamp oil cylinder through a clamp branch oil pipe, and the stripping oil pipe is connected to the stripping oil cylinder through a stripping branch oil pipe, and the flushing pipeline is in communication with each nozzle through a flushing branch pipeline.

[0020] The present application solves the problems of chaotic pipeline layout and inaccurate pressure regulation in traditional hydraulic systems through the second cavity and multiple oil pipe configuration of the pipeline area. The pressurized lifting and pressure recovery dual-channel design of the clamp oil pipe and the stripping oil pipe enables the hydraulic positioning unit and the stripping unit to respond quickly, avoiding operation lag caused by single-channel pressure fluctuations. The connection mode of the clamp branch oil pipe and the clamp oil cylinder ensures the synchronization of the extension and retraction of the first top rod and the transmission of pressure, and the linkage of the stripping branch oil pipe and the stripping oil cylinder improves the stability of the thrust of the second top rod. The flushing pipeline is in communication with the nozzle through the flushing branch pipeline, realizing efficient water flow delivery and directional injection, and cooperating with the distribution design of the flushing holes to accurately remove concrete residues. In addition, the independent cavity design of the pipeline area avoids interference between different functional pipelines, reducing the system failure rate caused by pipeline blockage or leakage.

[0021] According to a preferred embodiment, at least one flushing brush wall unit is provided above the hydraulic positioning unit of each box segment to complete the reset operation in cooperation with the hydraulic positioning unit by installing the nozzle in the flushing hole near the hydraulic positioning unit, wherein the intelligent control platform processes the detection data obtained by the detection unit to determine the reset condition of the positioning clamp of the hydraulic positioning unit and the water stop belt.

[0022] The present application solves the problems of inaccurate flushing range and incomplete residual removal in traditional flushing operation by arranging the flushing brush wall unit near the hydraulic positioning unit and combining the data processing function of the intelligent control platform. The nozzle installed in the flushing hole near the hydraulic positioning unit can clean the concrete debris around the positioning clamping piece, avoiding the failure of resetting caused by clamping piece jamming. The secondary flushing cleans the groove structure during the box pulling, further reducing the adhesion between the concrete and the box, and reducing the peeling resistance. The intelligent control platform obtains the resetting state of the positioning clamping piece and the water stop belt in real time through the detection unit, dynamically adjusts the flushing strategy in combination with the working time of the flushing brush wall unit, and ensures that the obstacles are cleaned in priority before the hydraulic positioning unit is completely reset, thereby improving the continuity and reliability of the overall construction. This cooperative control mechanism avoids the subjective error of manual judgment and improves the automation level of the construction process.

[0023] According to a preferred embodiment, the detection unit is provided with a stroke sensor and a distance sensor, the stroke sensor is used to detect the telescopic displacement information of the first top rod, and the distance sensor is used to detect the distance between the proximal end of the water stop belt and the side wall of the cavity, so that the intelligent control platform can comprehensively analyze two different types of detection data to determine the resetting integrity, thereby determining the starting time of the hydraulic stripping unit.

[0024] The present application solves the problem of difficult accurate determination of the resetting state of the hydraulic positioning unit in the water-rich sand layer through the double detection mechanism of the stroke sensor and the distance sensor. The stroke sensor can identify whether the top rod is stuck due to debris or the oil cylinder damping fails to return to the initial position by tracking the mechanical displacement of the first top rod. The distance sensor can determine whether the water stop belt is stuck due to concrete adhesion or side pressure by monitoring the distance between the proximal end of the water stop belt and the side wall of the cavity. The combined use of the two sensors establishes a dual verification system of "mechanical displacement + material position", effectively covering two typical failure scenarios of top rod false resetting and water stop belt adhesion. After the intelligent control platform comprehensively analyzes the two types of data, the hydraulic stripping unit is started only when both meet the resetting conditions, avoiding tearing of the water stop belt or deformation of the clamping piece due to misjudgment, and significantly improving the construction safety and equipment service life.

[0025] According to a preferred embodiment, after the hydraulic stripping unit is started, the ejection head arranged in the first cavity of the hydraulic area can translate along the length direction of the groove structure with the second top rod under the pushing of the stripping oil cylinder, so as to generate an opposite force by pushing the poured concrete, thereby stripping the multi-section combined box from the poured concrete, wherein the number of hydraulic stripping units arranged in the box section of the bottom box is more than that of the top box and the standard box.

[0026] The present invention solves the technical problems of excessive resistance and low efficiency in deep box stripping in water-rich sand layers through the linkage design of the ejector head and the second ejector rod of the hydraulic stripping unit, combined with the increased number of hydraulic stripping units in the bottom box. When the ejector head translates along the length direction of the groove, it generates a reverse force by pushing the poured concrete, gradually releasing the bonding force between the box and the concrete, avoiding concrete cracking or box instability caused by one-time stripping; the hydraulic stripping units added to the bottom box (more in number than the top box and standard box) can provide a greater thrust reserve, which is particularly suitable for working conditions where soil resistance and concrete bonding force increase significantly during deep construction. The bevel cut design further reduces the friction resistance at the bottom of the box, while the air pressure balance function of the vent reduces the vacuum adsorption effect. The synergistic effect of the two significantly improves the stripping efficiency, shortens the construction period, and reduces the risk of rework due to stripping failure.

[0027] The present invention also discloses a construction method of a water-rich sand layer underground continuous wall joint box system, which comprises the following steps:

[0028] Install a rubber waterstop on the multi-section combined box body, and fix the waterstop by applying a controllable clamping force through the positioning clip of the hydraulic positioning unit;

[0029] Position the assembled multi-section combined box and hoist it to the slot joint position, and backfill sand and gravel on the back side of the multi-section combined box to form an anti-circumvention wall structure;

[0030] Release the clamping force of the positioning clips during the initial setting stage of concrete;

[0031] After the concrete has finally set, the hydraulic stripping unit's graded loading program is activated, applying a jacking force step by step from the bottom to the top along the longitudinal direction of the multi-segment combined box, thereby achieving a controllable separation between the multi-segment combined box and the concrete interface.

[0032] During the lifting process of the multi-section combined box after stripping, the flushing and brushing unit is started to dynamically flush the concrete joint surface through the rotating nozzle.

[0033] The anti-circulation retaining wall structure optimizes the particle size of graded sand and gravel to form a gradient permeability layer. Fine particles fill the pores of the framework, creating a semi-permeable membrane effect. This allows groundwater to seep and reduce pressure while preventing cement slurry penetration. The graded stripping process, designed based on fracture mechanics crack propagation theory, controls the thrust rate to propagate interfacial cracks along a predetermined path, avoiding random bifurcation-induced concrete collapse. The dynamic flushing system utilizes the Venturi effect to optimize the jet velocity distribution, increasing impact force while reducing water pressure fluctuations. This flow field control technology overcomes the energy efficiency bottleneck of traditional high-pressure water guns.

[0034] According to a preferred embodiment, the construction method further comprises the following steps:

[0035] Pipeline pressure test and air tightness detection are carried out in the multi-section combined box assembly stage;

[0036] The underground continuous wall trenching construction is implemented according to the step sequence, the adaptive width of the fitting of the reserved joint box system is formed during the trenching construction;

[0037] The trenching construction quality is detected, the hole cleaning work of the trench section is carried out after the quality is qualified, the secondary hole cleaning operation is executed and the reinforcement cage is hoisted before the concrete pouring;

[0038] The concrete pouring construction is carried out, and the detection unit is used to detect each functional unit in real time during the pouring process;

[0039] The box cleaning and deformation correction treatment are executed after the multi-section combined box is hoisted out.

[0040] The adaptive width reservation quantity is determined based on the soil arching effect theory, a stable construction space is formed under the minimum overbreakage by optimizing the range of the trench wall relaxation zone. The secondary hole cleaning process adopts the composite purification technology of cyclone separation and screening filtration, and micron-level particle removal is realized by adjusting the rheological parameters of the slurry. The deformation correction treatment applies the principle of residual stress elimination, and adopts the composite process of multi-point hydraulic straightening and local thermal aging to restore the geometric accuracy of the box to the initial manufacturing standard. The process system breaks through the extensive mode of traditional experience construction and realizes the quantitative control of the whole process. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 is the structural schematic diagram of the multi-section combined box provided by the application;

[0042] Figure 2 is the local enlarged view of the connecting part of the top box and the standard box of the multi-section combined box provided by the application;

[0043] Figure 3 is the local enlarged view of the connecting part of the standard box and the bottom box of the multi-section combined box provided by the application;

[0044] Figure 4 is the structural schematic diagram of the top box provided by the application;

[0045] Figure 5 is the structural schematic diagram of the standard box provided by the application;

[0046] Figure 6 is the structural schematic diagram of the bottom box provided by the application;

[0047] Figure 7 is the stress distribution diagram of a certain box section structure under the most unfavorable working condition provided by the application;

[0048] Figure 8 is the displacement distribution diagram of a certain box section structure under the most unfavorable working condition provided by the application;

[0049] Figure 9 This is a top view of the box section and a schematic diagram of the pipeline layout of the multi-section combined box provided by the present invention;

[0050] Figure 10 This is a schematic diagram of the layout of the functional components of the junction box system provided by the present invention;

[0051] Figure 11 This is a schematic diagram of the layout of the hydraulic positioning unit provided by the present invention;

[0052] Figure 12 This is a schematic diagram of the layout of the clip oil pipe of the hydraulic positioning unit provided by the present invention;

[0053] Figure 13 Schematic diagram of the multi-section combined box provided by the present invention before and after the peeling operation;

[0054] Figure 14 This is a schematic diagram of the layout of the stripping oil pipe of the hydraulic stripping unit provided by the present invention;

[0055] Figure 15 It is a schematic diagram of the layout of the flushing pipeline of the wall flushing and brushing unit provided by the present invention.

[0056] Reference Signs List

[0057] 100: Multi-section combined box; 101: Lifting ring; 102: Connector; 103: Connecting hole; 104: Lifting rod; 110: Top box; 120: Standard box; 130: Bottom box; 131: Bevel cut; 140: Hydraulic area; 141: First cavity; 142: Cover; 143: Drain port; 150: Pipeline area; 151: Second cavity; 160: Maintenance area; 161: Maintenance port; 200: Hydraulic positioning unit; 201: Clip oil pipe; 202: Clip oil pressure cavity; 210: Positioning clip; 211: First push rod; 220: Water stop; 230: Clip branch oil pipe; 240: Clip oil cylinder; 250: Concave Groove structure; 260: Cavity side wall; 270: Pressure stabilizer; 300: Hydraulic stripping unit; 301: Stripping oil pipe; 302: Demolding oil pressure cavity; 310: Ejector head; 320: Second ejector rod; 330: Stripping branch oil pipe; 340: Stripping cylinder; 400: Wall flushing and brushing unit; 401: Flushing pipeline; 402: Flushing water pressure cavity; 403: Flushing hole; 404: Drain port; 410: Flushing branch pipeline; 420: Nozzle; 510: Stroke sensor; 520: Distance sensor; 610: Cast concrete; 620: Rebar cage; 630: Backfill soil; 700: Operating cavity; 701: Pressure indicator dial. DETAILED DESCRIPTION

[0058] The following is a detailed description with reference to the accompanying drawings.

[0059] Water-rich sand layer is a special geological environment for underground continuous wall construction. Its high permeability, low cohesion and dynamic water pressure pose multiple technical challenges to the engineering structure. The cohesion between sand particles in this stratum is weak, and under the driving of dynamic water pressure, it is prone to latent erosion, resulting in a significantly higher collapse rate of the trench wall than in conventional soft soil layers. After collapse, the fluidity of the sand body increases, forming a non-uniform stress distribution, which seriously threatens the construction accuracy and structural stability. The existing lock pipe joint technology relies on the self-forming mechanism of concrete. In water-rich sand layers, the pipe body is deflected due to the failure of mud wall protection, resulting in insufficient concrete density at the joint, and the leakage path is shortened to 60% of the conventional value, which cannot meet the impermeability requirement under 0.3 MPa water pressure. Although the I-shaped steel joint improves the water sealing property by lengthening the flow path, the steel-concrete interface produces 0.5-1 mm microcracks under sand particle erosion, forming a weak permeation zone, and the annual corrosion rate of steel components in the water-rich environment is 0.1 mm, significantly reducing the structural durability. Although the cross steel plate joint has the advantage of rigid connection, the stress concentration easily occurs in the heat-affected zone under the action of uneven settlement of the sand layer, and the detection rate of weld defects is as high as 12%, causing local water sealing failure.

[0060] The existing technical system has systematic defects in the construction process: when the lock pipe is removed, the frictional force increases by 40-60% due to sand adsorption, causing pipe deformation exceeding the standard; when the verticality deviation of the I-shaped steel exceeds 1%, the leakage risk is multiplied, and the control difficulty of the sand layer trenching accuracy is 3 times higher than that of soft soil; the cross steel plate installation requires multiple wall brushing, but the removal rate of sand layer concave residues is less than 70%, forming a slag leakage channel. More seriously, the traditional joint box is affected by lateral pressure in a 30 m deep water-rich sand layer, and the deformation of the box is 2-3 times the allowable value, causing the positioning deviation of the rubber waterstop 220 to exceed 15%, and the lack of synchronization of the hydraulic jack during the removal process causes shear failure, resulting in a tearing rate of the waterstop 220 as high as 18%. These technical bottlenecks make the existing joint technology face the triple dilemma of water sealing efficiency attenuation, construction period extension and maintenance cost increase in water-rich sand layer application, seriously restricting the safety and economy of underground space development.

[0061] Based on this, the present application provides a water-rich sand layer underground continuous wall joint box system and its construction method. Embodiment 1

[0062] The present invention discloses an underground continuous wall joint box system for a water-rich sand layer, which includes: a multi-section combined box body 100, which is used to form a modular rigid support structure for an underground continuous wall joint; a hydraulic positioning unit 200, which is used to fix a rubber water stop 220 through a first push rod 211 and a positioning clip 210; a hydraulic stripping unit 300, which is used to separate the multi-section combined box body 100 from the concrete interface through graded loading through a second push rod 320; a wall flushing and brushing unit 400, which is used to flush the concrete surface and remove residues by spraying water through a rotating nozzle; a detection unit, which is used to collect detection data in real time; and an intelligent control platform, which is used to integrate and control the coordinated work and automated operation of various functional units.

[0063] Preferably, if Figures 1-3 As shown, the multi-segment modular housing 100 can be modularly designed, consisting of several modular housings. The multi-segment modular housing 100 can include a variety of housing segments of varying specifications. The multi-segment modular housing 100 can include a top housing 110, a standard housing 120, and a bottom housing 130. The segments can be connected by bolts, and elastic cylindrical pins can be provided to assist in positioning, forming a rigid connection system. For example, the top housing 110 can be 6 meters long, the standard housing 120 can be 8 meters long, and the bottom housing 130 can be 10 meters long. The bolts connecting the segments can be M64×130 high-strength bolts (grade 10.9).

[0064] Preferably, the main body of the multi-section combined box 100 can be made of Q355B grade steel, with a back plate thickness of 40 mm and longitudinal ribs with a spacing of 150 mm to form a lattice force-bearing system.

[0065] Figure 9 The top view of each box section of the multi-section combined box 100 is shown. The box section can refer to one or more of the top box 110, the standard box 120 and the bottom box 130. Preferably, Figure 9 It can be seen that the tank section's body can be roughly divided into three layers: the first layer is configured as the hydraulic area 140, the second layer is configured as the piping area 150, and the third layer is configured as the maintenance area 160. The first, second, and third layers are sequentially connected and gradually widen, forming a trapezoidal structure with the narrower hydraulic area 140 gradually transitioning to the wider maintenance area 160. Preferably, an inflation bladder for preventing bypass flow can be installed at the widest point of the tank section's body, so that the degree of inflation of the bladder can be adjusted by controlling the inflation and deflation process.

[0066] Preferably, if Figure 9As shown, the hydraulic area 140 can be configured with two first cavities 141 that are independent of each other and have a certain gap, for setting the hydraulic components of the hydraulic positioning unit 200 and / or the hydraulic stripping unit 300. The gap between the two independent cavities of the hydraulic area 140 can be used to set the water stop 220, which can be fixed in the gap by the way of the hydraulic components of the hydraulic positioning unit 200 exerting force, wherein the gap can be configured as a groove structure 250, which has a width of 2-5 cm less than the hole in the rubber water stop 220 and a depth of 2-5 cm greater than the embedded width of the rubber water stop 220, to ensure the positioning accuracy of the water stop 220, cooperate with the positioning clamping piece 210 of the hydraulic positioning unit 200 and the stroke sensor 510, and control the positioning deviation of the water stop 220 within a safe range. The top of the hydraulic area 140 can be provided with a sewage outlet 143 with a cover 142 to avoid sewage stagnation in the hydraulic area 140 and damage the hydraulic components and other structural devices.

[0067] Preferably, as shown in Figure 9 As shown, the pipeline area 150 can be configured with a second cavity 151 for accommodating various pipelines, and the pipelines in the pipeline area 150 can be connected with the functional components of the hydraulic positioning unit 200, the hydraulic stripping unit 300 and / or the flushing brush wall unit 400 to realize the delivery and supply of liquid. The pipelines in the pipeline area 150 can include two clamping piece oil pipes 201, two stripping oil pipes 301 and a flushing pipeline 401, wherein one of the two clamping piece oil pipes 201 is used for pressurized lifting and the other is used for pressure recovery; one of the two stripping oil pipes 301 is used for pressurized lifting and the other is used for pressure recovery. The top of the pipeline area 150 can be provided with a connecting piece 102 for connecting with the adjacent upper box section or external equipment (such as lifting equipment).

[0068] Preferably, as shown in Figures 1-6 , Figure 9 As shown, the maintenance area 160 can be configured with a plurality of maintenance openings 161 with cover plates, so that the maintenance personnel can open the corresponding maintenance openings 161 to maintain the abnormal functional components, wherein the number and position of the maintenance openings 161 can be determined based on the number and position of the functional components of the hydraulic positioning unit 200, the hydraulic stripping unit 300 and / or the flushing brush wall unit 400 set in each box section, each functional component can be provided with a corresponding maintenance opening 161, and the number and position of various functional components in the top box 110, the standard box 120 and the bottom box 130 are not the same, which in turn results in the number and position of the maintenance openings 161 being not the same.

[0069] Preferably, as shown in Figure 1 , Figure 2 , Figure 4As shown, the top of the box section of the top box 110 can be provided with a connecting piece 102, wherein the connecting piece 102 of the top box 110 can include a lifting rod 104 and a lifting ring 101, one side of the lifting rod 104 is connected to the box body of the top box 110, and the other side is connected to the lifting ring 101, so that the lifting ring 101 can drive the box body of the top box 110 to move synchronously through the lifting rod 104 when the lifting equipment (such as a crane) is lifted upward, thereby driving the entire multi-section combined box body 100 to move. The bottom of the box section of the top box 110 can be provided with a connecting hole 103 (such as a bolt hole) to be connected to the connecting piece 102 (such as a bolt) provided on the standard box 120, thereby realizing the butt joint of the top box 110 and the standard box 120.

[0070] Preferably, as shown in Figures 1-3 , Figure 5 As shown, the top of the box body of the standard box 120 can be provided with a connecting piece 102 (such as a bolt), and the bottom of the box section of the standard box 120 can be provided with a connecting hole 103 (such as a bolt hole), so that the connecting piece 102 of the standard box 120 can be butt jointed with the connecting hole 103 of the adjacent upper box section, and the connecting hole 103 of the standard box 120 can be butt jointed with the connecting piece 102 of the adjacent lower box section, wherein the "adjacent upper box section" here includes the top box 110 and / or the standard box 120, and the "adjacent lower box section" here includes the bottom box 130 and / or the standard box 120. In the present application, "upper" and "lower" refer to the relative spatial positional relationship of the multi-section combined box body 100 after splicing, wherein compared to the target box section, the upper box section is the box section whose splicing position is above the target box section, and the lower box section is the box section whose splicing position is below the target box section. In the present application, "adjacent" refers to the association of two box sections that are butt jointed through the connecting piece 102 and the connecting hole 103.

[0071] Preferably, as shown in Figure 1 , Figure 3 , Figure 6 As shown, the top of the box body of the bottom box 130 can be provided with a connecting piece 102 (such as a bolt) for butt jointing with the connecting hole 103 (such as a bolt hole) of the standard box 120. The bottom of the box section of the bottom box 130 can be provided with a bevel cutout 131, which can reduce the soil resistance during box pulling, reduce the adhesion between concrete and the box body, and assist the stripping device to achieve effective separation. The bottom of the box section of the bottom box 130 can be provided with a vent hole for balancing the air pressure inside and outside the box body, preventing vacuum adsorption force during box pulling, and further reducing the pulling resistance.

[0072] Preferably, a plurality of flushing holes 403 may be provided at intervals along the longitudinal direction in the top box 110, the standard box 120 and the bottom box 130, and flushing holes 403 may also be provided at the bottom of the box section of the bottom box 130, so that when the joint box system is pulled out, the flushing and brushing unit 400 can simultaneously flush the concrete surface through the flushing holes 403 to remove residues and reduce the hidden dangers of slag inclusion.

[0073] Preferably, if Figures 1-6 As shown, in terms of a single box section, the top box 110 can be configured with three hydraulic positioning units 200 and two hydraulic stripping units 300; the standard box 120 can be configured with three hydraulic positioning units 200 and two hydraulic stripping units 300; and the bottom box 130 can be configured with five hydraulic positioning units 200 and four hydraulic stripping units 300, wherein the hydraulic positioning units 200 and the hydraulic stripping units 300 are arranged alternately. The purpose of setting up more functional units in the bottom box 130 compared to the top box 110 and the standard box 120 is that it is located at the deepest part of the ground and needs to overcome greater soil resistance and concrete adhesion. By increasing the number of functional units and combining designs such as bevel cuts 131 and air vents, the stripping efficiency can be significantly improved, the resistance to box removal can be reduced, and the reliable separation of the joint box system in complex working conditions of water-rich sand layers can be ensured. At the same time, the hidden dangers of slag inclusion can be reduced, ensuring the quality and safety of underground continuous wall joint construction. Preferably, the hydraulic stripping units 300 of each tank segment can be arranged in pairs and symmetrically, that is, two hydraulic stripping units 300 form a pair, and the shortest distances between the two hydraulic stripping units 300 and the top or bottom of the tank segment are equal. For example, of the two hydraulic stripping units 300 of the top tank 110, the hydraulic stripping unit 300 near the top is approximately 1 / 4 of the tank segment length away from the top, and the hydraulic stripping unit 300 near the bottom is approximately 1 / 4 of the tank segment length away from the bottom, thereby forming a pair of symmetrical hydraulic stripping units 300. Preferably, the hydraulic positioning unit 200 of each tank segment can be arranged eccentrically, and in particular, can be arranged offset toward the top of the tank segment.

[0074] Preferably, the flushing and brushing units 400 of each tank section can be positioned based on the number and location of the hydraulic positioning units 200 of that tank section. Furthermore, at least one flushing and brushing unit 400 can be positioned adjacent to and above each hydraulic positioning unit 200 of that tank section to facilitate use with the hydraulic positioning unit 200. "Adjacent to and above" means that the flushing and brushing unit 400 is spatially located above the corresponding hydraulic positioning unit 200, and the flushing range of the flushing and brushing unit 400 covers the operating area of ​​the corresponding hydraulic positioning unit 200. Furthermore, one or more additional flushing and brushing units 400 can be positioned at the bottom of the tank section of the bottom tank 130 to facilitate the stripping operation with the hydraulic stripping unit 300.

[0075] Preferably, the present invention performs numerical simulation (single-unit test) on a certain box section structure under the most unfavorable working condition, so as to make a safety judgment on the junction box based on the force and deformation calculation results. Figure 7 is the stress distribution diagram, Figure 8 The displacement distribution diagram is shown in the figure. The text in the figure is a screenshot of the software. Figure 7 and Figure 8 As can be seen, the maximum stress is located in the first cavity 141, with a maximum force of 1.5 GPa, which is only 0.7% of the elastic modulus of the Q325 material at that location. The maximum deformation occurs at the back plate of the stripping cylinder 340 (access opening 161 corresponding to the hydraulic stripping unit 300), with a deformation of 2 mm, or 0.02% of the entire section length. The numerical simulation results of stress and deformation indicate that the multi-section modular housing 100 of the present invention has a sufficient safety threshold under the most adverse operating conditions.

[0076] Figure 10 、 Figure 12 and Figure 14 The oil pipe drawn with a dotted line represents the pressurized lifting oil pipe, and the oil pipe drawn with a solid line represents the decompression recovery oil pipe.

[0077] Preferably, if Figure 11 and Figure 12 As shown, each hydraulic positioning unit 200 may include: two clip branch oil pipes 230, which are respectively connected to the two clip oil pipes 201 for pressurized lifting and for decompression recovery; a clip cylinder 240, which is connected to the clip branch oil pipe 230 to push the first push rod 211 to move in translation; the first push rod 211 and a positioning clip 210 provided at the end of the first push rod 211. The positioning clip 210 can be provided in the groove structure 250 and, under the push of the clip cylinder 240, move in translation along the width direction of the groove structure 250 with the first push rod 211 to achieve the fixing and release of the water stop 220. The area swept by the positioning clip 210 in translation and the area extending along the length direction of the groove structure 250 to the opening position of the groove structure 250 can be referred to as the operating area.

[0078] Preferably, if Figure 13 and Figure 14As shown, each hydraulic stripping unit 300 may include: two stripping branch oil pipes 330, which are respectively connected to the two stripping oil pipes 301 for pressurized lifting and decompression recovery; a stripping cylinder 340, which is connected to the stripping branch oil pipes 330 to push the second push rod 320 for translation; the second push rod 320 and an ejector head 310 disposed at the end of the second push rod 320. The ejector head 310 may be disposed in the first cavity 141 of the hydraulic area 140 and, under the push of the stripping cylinder 340, translates along the length direction of the groove structure 250 with the second push rod 320, thereby pushing the poured concrete 610 to generate an opposing force, thereby stripping the multi-segmented modular box 100 from the poured concrete 610. When the multi-section combined box body 100 is in use, the side with a smaller width (i.e., the side close to the hydraulic area 140) is set toward the steel cage 620, and the side with a larger width (i.e., the side close to the maintenance area 160) is set toward the backfill 630. After the steel cage 620 is poured and the poured concrete 610 is formed, the hydraulic stripping unit 300 can be used to perform the stripping operation.

[0079] Preferably, if Figure 15 As shown, each flushing and brushing unit 400 may include: a flushing branch pipe 410 for connecting to the flushing pipe 401; and a nozzle 420 in communication with the flushing branch pipe 410. The nozzle 420 may be inserted into a flushing hole 403 of matching structural dimensions, so that flushing water in the flushing and brushing unit 400 can pass through the flushing hole 403 to generate a flushing force on the concrete surface, thereby effectively stripping adhered cement slurry and sand particles.

[0080] Preferably, if Figure 10As shown, multiple hydraulic positioning units 200 can be connected to the same set of clamp oil pipes 201, and the two oil pipes of the set of clamp oil pipes 201 are respectively used for pressurized lifting and pressure reduction recovery, wherein the two clamp oil pipes 201 are connected to a clamp oil pressure cavity 202, and a pressure stabilizer 270 can be further arranged on the clamp oil pipe 201 for pressure reduction recovery, so as to maintain the support force of each clamp oil cylinder 240 on the corresponding first jack rod 211. Multiple hydraulic stripping units 300 can be connected to the same set of stripping oil pipes 301, and the two oil pipes of the set of stripping oil pipes 301 are respectively used for pressurized lifting and pressure reduction recovery, wherein the two stripping oil pipes 301 are connected to a stripping oil pressure cavity 302. Multiple flushing brush wall units 400 can be connected to the same flushing pipe 401, wherein the flushing pipe 401 can be connected to a flushing water pressure cavity 402, and a water outlet 404 can be arranged on the flushing pipe 401 for emptying the flushing pipe 401. Preferably, the clamp oil pressure cavity 202, the stripping oil pressure cavity 302 and the flushing water pressure cavity 402 can be arranged on the ground, so as to be flexibly controlled, wherein an operation cavity 700 for controlling the clamp oil pressure cavity 202, the stripping oil pressure cavity 302 and / or the flushing water pressure cavity 402 and a pressure indicating dial 701 for displaying the pressure data of each cavity can be arranged on the ground.

[0081] Preferably, the completion of reset of the hydraulic positioning unit 200 is the starting condition of the hydraulic stripping unit 300, wherein the completion of reset of the hydraulic positioning unit 200 includes the reset of the positioning clamp 210 and the reset of the water stop 220. Further, the reset of the positioning clamp 210 refers to the contraction of the first jack rod 211 to the shortest length so that the positioning clamp 210 reaches the initial position; and the reset of the water stop 220 refers to the removal of the pressure applied by the positioning clamp 210 to release the adhesion to the cavity side wall 260 and restore to the natural state.

[0082] Preferably, the flushing brush wall unit 400 can include multiple working starting times, wherein the first working starting time of the flushing brush wall unit 400 is before the reset operation of the hydraulic positioning unit 200, for cleaning the concrete around the positioning clamp 210; and the second working starting time of the flushing brush wall unit 400 is during the pulling up of the multi-section combined box 100, for cleaning the concrete in the groove structure 250.

[0083] Preferably, the present application can collect detection data in real time through a detection unit, and process the detection data obtained by the detection unit through an intelligent control platform, so as to determine the reset conditions of the positioning clamp 210 and the water stop 220 of the hydraulic positioning unit 200.

[0084] Preferably, the detection unit can be configured with a stroke sensor 510 for detecting the telescopic displacement information of the first top rod 211, wherein the stroke sensor 510 can adopt a magnetostrictive displacement sensor arranged outside the cylinder body of the clamp cylinder 240 of the hydraulic positioning unit 200 along the axial direction of the first top rod 211, and the built-in waveguide wire is combined with a permanent magnet ring that can move synchronously with the top rod, so as to accurately obtain the real-time position of the top rod by detecting the time difference between the electric pulse and the mechanical wave, and the measurement accuracy can reach the millimeter level. The stroke sensor 510 can be externally sleeved with a stainless steel protective sleeve, a high-pressure resistant sealing rubber ring is used between the sleeve and the cylinder body to prevent the invasion of mud, a waterproof joint is configured at the cable outlet end and connected to an explosion-proof junction box, so as to ensure stable work in the water-rich sand layer environment.

[0085] Preferably, the detection unit can also be configured with a distance sensor 520 for detecting the distance between the proximal end of the water stop belt 220 and the cavity side wall 260 of the first cavity 141, and the cavity side wall 260 can refer to the side wall of the first cavity 141 without the hydraulic positioning unit 200. Further, the distance sensor 520 can be an ultrasonic reflection type sensor, wherein the ultrasonic reflection type sensor can adopt a split structure design: the detection head is embedded in the cavity side wall 260 and communicates with the proximal end region of the water stop belt 220 through the detection hole, the surface of the detection head is covered with a thick polytetrafluoroethylene sound transmission film, which can isolate mud and not affect the transmission of ultrasonic waves; the signal processing unit can be connected with the detection head through an armored cable. The detection head is built-in with a double-crystal probe, emits ultrasonic pulses, and calculates the distance from the proximal end of the water stop belt 220 by using the echo time difference principle.

[0086] The detection unit of the present application is configured with two different types of sensors (i.e. the stroke sensor 510 and the distance sensor 520) due to the double resetting risk in the water-rich sand layer pouring working condition: after the concrete pouring, the groove structure 250 is easy to be filled with mud and concrete debris, on the one hand, when the hydraulic positioning unit 200 is unloaded, the first jack rod 211 may fail to drive the positioning clamp 210 to retreat to the initial position (mechanical reset failure of the first jack rod 211) due to debris jamming, cylinder damping, etc.; on the other hand, even if the jack rod retreats smoothly, the water stop belt 220 may continuously adhere to the cavity side wall 260 without rebounding to the preset distance (material reset failure of the water stop belt 220) due to concrete adhesion and lateral pressure extrusion. If only the stroke sensor 510 is relied on, when the first jack rod 211 "apparently resets" but the positioning clamp 210 still jams the water stop belt 220 (false reset), or the water stop belt 220 is independently adhered, the intelligent control platform will misjudge the reset completion and start the hydraulic stripping unit 300, at this time the stripping force will directly act on the water stop belt 220 which has not been normally reset, resulting in tearing of the water stop belt 220 and / or deformation of the positioning clamp 210; conversely, if only the distance of the water stop belt 220 is monitored, when the first jack rod 211 is not reset, the continuous extrusion of the positioning clamp 210 on the water stop belt 220 will mask its true state, also causing misjudgment. Therefore, by tracking the mechanical movement trajectory of the first jack rod 211 through the stroke sensor 510 and monitoring the relative position of the water stop belt 220 and the cavity side wall 260 through the distance sensor 520, a double monitoring system of "mechanical displacement + material position" is constructed, which can cover the failure scenarios such as jamming of the first jack rod 211 and adhesion of the water stop belt 220, ensure accurate judgment of the reset integrity by the intelligent control platform, avoid blind spots in a single monitoring dimension causing construction failure, and ensure reliable operation of the joint box system in the water-rich sand layer environment. Embodiment 2

[0087] This embodiment is a further improvement of embodiment 1, and the repeated contents will not be described again.

[0088] The present application discloses a construction method of a water-rich sand layer underground continuous wall joint box system as described in embodiment 1, which comprises the following steps:

[0089] S1. Perform pipeline pressure test and air tightness detection during the assembly stage of the multi-section combined box body 100;

[0090] S2. Install the rubber water stop belt 220 on the multi-section combined box body 100, and fix the water stop belt 220 by the controllable clamping force applied by the positioning clamp 210 of the hydraulic positioning unit 200;

[0091] S3. Perform trenching construction of the underground continuous wall according to the step sequence, and reserve the adaptive width of the joint box system during the trenching construction;

[0092] ​S4. Detect the quality of the trench construction, and after the quality is qualified, perform the hole cleaning work of the trench section, perform the second hole cleaning operation before the concrete pouring and hoist the reinforcement cage 620;

[0093] S5. Position and hoist the assembled multi-section combined box 100 to the joint position of the trench section, and backfill the sand and gravel soil at the back side of the multi-section combined box 100 to form an anti-eddy current protection wall structure;

[0094] S6. Perform the concrete pouring construction, and use the detection unit to perform real-time detection on each functional unit during the pouring process;

[0095] S7. Release the clamping force of the positioning clamp 210 at the initial setting stage of the concrete;

[0096] S8. After the concrete is finally set, start the staged loading program of the hydraulic stripping unit 300, and gradually apply the jacking force from the bottom to the top along the longitudinal direction of the multi-section combined box 100 to realize the controllable separation of the multi-section combined box 100 and the concrete interface;

[0097] S9. Start the flushing and wall brushing unit 400 during the hoisting out process after the multi-section combined box 100 is stripped, and perform dynamic flushing treatment on the concrete joint surface through the spray head;

[0098] S10. After the multi-section combined box 100 is hoisted out, perform the box cleaning and deformation correction treatment.

[0099] Preferably, the construction can be repeated according to steps S2-S9 in the straight trench section. When the closed trench section is constructed, steps S3, S4 and S6 can be performed. When all the closed trench sections of the underground continuous wall are constructed, the underground continuous wall sub-item project is completed.

[0100] Preferably, the fixed state of the water stop belt 220 can be checked in step S2, and after the check is qualified, the box is brushed with a friction-reducing agent.

[0101] Preferably, 100-300 mm can be reserved in step S3.

[0102] Preferably, when the construction is performed by using the above construction method, the detection unit can be used to collect real-time detection data, and the intelligent control platform can be used to analyze and process the detection data obtained by the detection unit and generate corresponding control signals to control the collaborative work and automatic operation of each functional unit.

[0103] It should be noted that the above-mentioned embodiments are only examples, and those skilled in the art can think of various solutions under the inspiration of the disclosure of the present application, and these solutions also belong to the disclosed range of the present application and fall within the protection scope of the present application. Those skilled in the art should understand that the specification and drawings of the present application are illustrative and not limiting to the claims. The protection scope of the present application is defined by the claims and their equivalents. The specification of the present application contains multiple inventive concepts, such as "preferably" or "according to a preferred embodiment", which means that the corresponding paragraph discloses an independent concept, and the applicant reserves the right to file a divisional application according to each inventive concept. Throughout the text, the features introduced by "preferably" are only optional ways, and should not be understood as necessarily set, therefore the applicant reserves the right to abandon or delete the relevant preferred features at any time.

Claims

1. A water-rich sand layer underground continuous wall joint box system, characterized in that: It includes: A multi-section combined box (100) is used to form a modular rigid support structure for underground continuous wall joints. The box section box includes a three-layer structure, the first layer is a hydraulic area (140), the second layer is a pipeline area (150), and the third layer is a maintenance area (160). The three layers are connected in sequence and gradually widened to form a trapezoidal structure. When the multi-section combined box (100) is hoisted, the hydraulic area (140) is arranged in a manner such that the hydraulic area (140) is close to the steel cage (620) and the maintenance area (160) is close to the backfill (630). The hydraulic area (140) is configured with two first cavities (141) that are independent of each other and have a gap. The gap is configured as a recess for arranging a water stop (220). A groove structure (250), wherein the pipeline area (150) is configured with a second cavity (151) for accommodating a clip oil pipe (201), a stripping oil pipe (301) and a flushing pipeline (401), wherein the clip oil pipe (201) and the stripping oil pipe (301) each include at least two oil pipes, one of which is used for pressurized lifting and the other is used for decompressed recovery, and the clip oil pipe (201) is connected to the clip oil cylinder (240) through a clip branch oil pipe (230), the stripping oil pipe (301) is connected to the stripping oil cylinder (340) through a stripping branch oil pipe (330), and the flushing pipeline (401) is connected to each nozzle (420) through a flushing branch pipeline (410); A hydraulic positioning unit (200) is used to fix the waterstop (220) in the groove structure (250) through the force applied by the first push rod (211) and the positioning clip (210); A hydraulic stripping unit (300) is used to separate the multi-section combined box (100) from the poured concrete (610) via a second push rod (320); The flushing and brushing unit (400) is used to spray water through the nozzle (420) to flush the concrete surface and remove residues. The hydraulic positioning unit (200) completing the reset is a starting condition for the hydraulic stripping unit (300), wherein the hydraulic positioning unit (200) completing the reset includes the reset of the positioning clip (210) and the reset of the water stop (220); The flushing and brushing wall unit (400) includes multiple working start-up opportunities, wherein the first working start-up opportunity of the flushing and brushing wall unit (400) is before the hydraulic positioning unit (200) performs a reset operation, and is used to clean the concrete around the positioning clip (210); the second working start-up opportunity of the flushing and brushing wall unit (400) is when the multi-section combined box (100) is pulled up, and is used to clean the concrete in the groove structure.

2. The system according to claim 1, wherein: The multi-section combined box body (100) comprises a plurality of modular box sections that can be spliced ​​together, and is divided into a top box (110), a standard box (120) and a bottom box (130). Adjacent box sections can be detachably fixed by cooperating with a connecting piece (102) and a connecting hole (103). The top of the box section of the top box (110) is provided with a lifting rod (104) and a lifting ring (101), and the bottom of the box section of the bottom box (130) is provided with an oblique cut (131) structure and a flushing hole (403).

3. The system according to claim 1, wherein: At least one flushing and brushing unit (400) is provided above the hydraulic positioning unit (200) of each box section, so as to cooperate with the hydraulic positioning unit (200) to complete the resetting operation by installing a nozzle (420) in a flushing hole (403) located near the hydraulic positioning unit (200), wherein the intelligent control platform processes the detection data obtained by the detection unit to determine the resetting status of the positioning clip (210) and the water stop (220) of the hydraulic positioning unit (200).

4. The system according to claim 3, characterized in that The detection unit is equipped with a stroke sensor (510) and a distance sensor (520), wherein the stroke sensor (510) is used to detect the telescopic displacement information of the first push rod (211), and the distance sensor (520) is used to detect the distance between the proximal end of the water stop (220) and the side wall (260) of the cavity, so that the intelligent control platform can comprehensively analyze the two different types of detection data to judge the reset integrity, thereby determining the start timing of the hydraulic stripping unit (300).

5. The system according to claim 4, characterized in that After the hydraulic stripping unit (300) is activated, the ejector head (310) arranged in the first cavity (141) of the hydraulic zone (140) can be pushed by the stripping cylinder (340) and translated along the length direction of the groove structure (250) along with the second ejector rod (320) to generate an opposite force by pushing the poured concrete (610), thereby causing the multi-section combined box (100) to be stripped from the poured concrete (610), wherein the number of hydraulic stripping units (300) arranged in the box section of the bottom box (130) is greater than that of the top box (110) and the standard box (120).

6. A construction method for a water-rich sand layer underground continuous wall joint box system according to any one of claims 1 to 5, characterized in that: It includes the following steps: Installing a water stop (220) on the multi-section combined box (100), and applying a controllable clamping force through the positioning clip (210) of the hydraulic positioning unit (200) to fix the water stop (220); Positioning and hoisting the assembled multi-section combined box (100) to the slot section joint position, backfilling the back side of the multi-section combined box (100) with sand and gravel to form an anti-circumvention wall structure; During the initial setting stage of the concrete, the clamping force of the positioning clip (210) is released; After the concrete is finally set, the step-by-step loading program of the hydraulic stripping unit (300) is started to apply a thrust force step by step from the bottom to the top along the longitudinal direction of the multi-segment combined box (100), thereby achieving controllable separation of the multi-segment combined box (100) and the concrete interface; During the lifting process of the multi-section combined box body (100) after being peeled off, the flushing and brushing wall unit (400) is activated to dynamically flush the concrete joint surface through the nozzle (420).

7. The method according to claim 6, characterized in that It also includes the following steps: During the assembly phase of the multi-section combined box (100), a pipeline pressure test and an air tightness test are performed; Carry out the underground diaphragm wall trenching construction in sequence, and reserve the adaptability width to the joint box system during trenching construction; Inspect the trench construction quality, and after the quality is qualified, perform the trench section hole cleaning work, perform the secondary hole cleaning work and hoist the steel cage before concrete pouring (620); Carry out concrete pouring construction, and use the detection unit to conduct real-time detection of each functional unit during the pouring process; After the multi-section combined box (100) is hoisted out, the box is cleaned and the deformation is corrected.

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