Maintenance structure for downstream face of diaphragm wall structure and construction method of maintenance structure

Abstract

The invention relates to a maintenance structure of a downstream face of an underground diaphragm wall structure and a construction method of the maintenance structure, and belongs to the technical field of underground construction engineering leakage water treatment. The maintenance structure comprises an underground diaphragm wall structure, an upstream face double-layer grouting waterproof curtain of the underground diaphragm wall structure, an underground diaphragm wall deep grouting layer, a downstream face waterproof mortar layer of the underground diaphragm wall structure, a waterproof grouting material layer, a waterproof coating layer and a cement pressure plate layer. Four waterproof fortification including the double-layer grouting waterproof curtain layer, the downstream face waterproof mortar layer, the waterproof grouting material layer and the corrosion-resistant flexible waterproof coating layer is adopted, the waterproof effect of the basement is guaranteed in multiple directions, and especially the waterproof effect of the basement used in high-end application scenes such as clubs and office buildings is guaranteed; the maintenance structure does not need to use an existing partition drainage ditch, so that no space is used for accumulating dirty water in the wall, space is saved, and safety and cleanness are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of water leakage control in underground construction projects, and in particular to a maintenance structure for the back water surface of a ground-connected wall structure and a construction method thereof. Background Art

[0002] The existing exterior walls of many basement projects are constructed in the following form: the ground-connected wall also serves as the structural wall, with a masonry partition wall inside, and a drainage ditch between the ground-connected wall and the masonry wall. Since the ground-connected wall of this structure is cast in the soil and is only a protective structure, it is bound to have quality defects such as honeycomb surface and mixed soil, and the ground-connected wall and the basement floor and roof are not cast at the same time, which is bound to cause water leakage. Therefore, this type of basement exterior wall structure often has huge hidden dangers of water leakage, basement leakage, mold, high moisture, excessive harmful gases, etc., and is difficult to repair.

[0003] In order to solve the water leakage problem of the above-mentioned structure, the existing technology generally focuses on drainage and assists with shallow grouting. However, this method has limited effect on improving the air quality and the quality of waterproofing, moisture-proofing and mildew-proofing. It is not suitable for high-end basements that have extremely high requirements for air quality, waterproofing, moisture-proofing and mildew-proofing and do not allow drainage, such as basements used as clubs, hotels, and office spaces.

[0004] In addition, the existing partition wall drainage ditch has the following problems:

[0005] (1) Drainage partition walls take up a large space, which is cost-effective for cities where land is scarce;

[0006] (2) Mold and dirty water can easily grow inside the partition walls, and rats and other animals can easily hide and move around;

[0007] (3) Due to the special characteristics of the underground, radioactive gases, such as radon, enter the room along with groundwater, which seriously affects the living environment of the basement;

[0008] (4) Since the existing partition wall drainage ditch has no waterproof layer, once the drainage is blocked, groundwater accumulates in the wall and is still prone to leakage;

[0009] (5) Since the water collection well is indoors, the indoor humidity is high and the fresh air system needs to be turned on for a long time for dehumidification, which increases the cost of living. Summary of the invention

[0010] In order to solve the problems existing in the prior art, the present application provides a maintenance structure and a construction method for the back water surface of a ground-connected wall structure, so as to obtain a basement that can eliminate leakage hazards, save space and is safe and clean. It is suitable as a non-reinforced concrete structural wall of the basement exterior wall.

[0011] In order to achieve the above objectives, this application adopts the following technical solutions.

[0012] In a first aspect, the present application provides a maintenance structure for the back water surface of a ground-connected wall structure, comprising a ground-connected wall structure, a double-layer grouting water-stopping curtain on the water-facing surface of the ground-connected wall structure, a deep grouting layer of the ground-connected wall, a waterproof mortar layer on the back water surface of the ground-connected wall structure, a waterproof grouting material layer, a waterproof coating layer and a cement pressure plate layer; wherein,

[0013] The ground-connected wall structure comprises a ground-connected wall, a beam slab, a bottom slab and a column;

[0014] The double-layer grouting waterproof curtain includes an inorganic grouting waterproof curtain and an acrylate grouting waterproof curtain;

[0015] The deep grouting layer of the ground-connected wall includes grouting material poured into the grouting holes drilled in the ground-connected wall and a plugging agent used to plug the grouting holes;

[0016] The back-water surface waterproof mortar layer, waterproof grouting material layer, waterproof coating layer and cement pressure layer plate are sequentially arranged on the back-water surface of the ground-connected wall structure;

[0017] The back waterproof mortar layer includes waterproof mortar and pre-buried grouting pipes and grouting conduits;

[0018] The waterproof grouting material layer includes a wall formed by the waterproof grouting material, a pre-buried steel mesh support and a steel mesh for the lining;

[0019] The waterproof coating layer is coated on the water-facing surface of the cement pressure plate layer;

[0020] The cement pressure plate layer comprises cement pressure plates, waterproof coatings at the joints of the cement pressure plates, angle steel fixings and waterproof grouting materials.

[0021] The maintenance structure of the back water surface of the ground-connected wall structure provided in this application includes four waterproof defenses, namely, a double-layer grouting water-stop curtain layer, a back water surface waterproof mortar layer, a waterproof grouting material layer and a waterproof coating layer (for example, a corrosion-resistant flexible waterproof coating layer), which comprehensively guarantees the waterproof effect of the basement using this structure, especially the waterproof effect of the basement used in high-end application scenarios such as clubs and office buildings. Among them, the double-layer grouting water-stop curtain includes an inorganic grouting water-stop curtain and an acrylate grouting water-stop curtain; the two intersect together, the inorganic grouting water-stop curtain can play a role in blocking large leaks, and the acrylate grouting water-stop curtain forms an overall waterproof layer on the outside of the inorganic grouting water-stop curtain, thereby effectively improving the waterproof effect.

[0022] As an optional implementation, the inorganic grouting material includes cement, water glass and special waterproof material.

[0023] In the present application, cement-water glass can be a conventional commercial grouting material in the art, wherein a waterproofing agent is added to form the inorganic grouting material of the present application. The waterproofing agent can be a conventional waterproofing agent in the art.

[0024] As an optional implementation, the acrylate grouting material includes two components A and B, and the volume ratio of A to B is 1:0.8-1.2 (for example, 1:1).

[0025] In the present application, the acrylate grouting material adopts the conventional grouting material in the art. For example, in the acrylate grouting material, component A includes component A1 and component A2, and component B includes component B1 and component B2, wherein A1 is acrylate resin, A2 is accelerator, B1 is acrylic emulsion, and B2 is initiator. Add all the A2 components to the A1 component and stir evenly to form the A component; add all the B2 components to B1 and stir evenly to form the B component; and mix the A and B components in a volume ratio of 1:1 for grouting.

[0026] As an optional implementation, in the deep grouting layer of the ground-anchored wall, the grouting material includes a permeable epoxy resin grouting material, which is used to seal and reinforce defects such as cracks in the structural concrete.

[0027] As an optional implementation, in the deep grouting layer of the ground-anchored wall, the plugging agent includes at least one of polymer waterproof mortar, epoxy mortar and leak-proof sealant.

[0028] As an optional embodiment, in the back waterproof mortar layer, the waterproof mortar includes at least one of polymer cement waterproof mortar and waterproof mortar mixed with waterproofing agent, which has an anti-seepage effect and improves the anti-seepage property of the ground-connected wall structure.

[0029] In the present application, the waterproofing agent in the waterproof mortar mixed with the waterproofing agent is not specifically limited, and conventional waterproofing agents in the art may be used.

[0030] As an optional implementation, in the back waterproof mortar layer, the pre-buried grouting pipe is parallel to the wall surface of the ground-connected wall structure.

[0031] As an optional implementation, in the back waterproof mortar layer, the pre-buried grouting pipe includes a stainless steel grouting pipe.

[0032] In the present application, the thickness of the back-water waterproof mortar layer can be selected according to actual needs.

[0033] As an optional implementation, the thickness of the waterproof mortar layer on the back water surface is 0.5 to 1.5 cm (for example, 1 cm).

[0034] As an optional implementation manner, in the waterproof grouting material layer or the cement pressure board layer, the waterproof grouting material includes cement, mortar, epoxy resin, polyurea and waterproof coating.

[0035] In the present application, the main components of the waterproof grouting material are cement and mortar, with epoxy resin, polyurea, waterproofing agent, etc. The material is fine and has no coarse aggregate. There will be no vibration problem. Compared with concrete, it can better fill and compact the cavity. At the same time, the pouring method from bottom to top can be used to cover all aspects, avoiding the problem that the top of the wall cannot be poured when pouring concrete. The waterproof grouting material has the characteristics of high strength. In addition, the waterproof grouting material is waterproof, which further ensures the waterproof safety of the joints of the cement pressure plate in the waterproof grouting material layer and the cement pressure plate layer.

[0036] As an optional implementation, the waterproof grouting material includes a penetrating epoxy resin.

[0037] In the present application, the thickness of the waterproof grouting material layer can be selected according to actual needs.

[0038] As an optional implementation manner, the thickness of the waterproof grouting material layer is ≥5 cm.

[0039] As an optional implementation, the waterproof coating layer includes a waterproof coating, and the waterproof coating is a flexible waterproof coating.

[0040] As an optional implementation, the flexible waterproof coating is a corrosion-resistant flexible waterproof coating.

[0041] As an optional embodiment, the corrosion-resistant flexible waterproof coating includes at least one of a polyurea waterproof coating and a high-strength polyurethane waterproof coating; or uses the same waterproof coating as that in the waterproof grouting layer.

[0042] In the present application, the waterproof coating in the waterproof coating layer can be bonded with the waterproof glue in the waterproof grouting material layer to form a whole, ensuring the continuity and integrity of the waterproof layer on the water-facing surface of the wall of the waterproof grouting material layer. For example, pure polyurea waterproof coating, high-strength polyurethane waterproof coating, etc. can be used, or the same material as the material added in the grouting material can be compatible and firmly bonded.

[0043] As an optional implementation, the thickness of the waterproof coating layer is 1.5 to 2.0 mm (eg, 1.5 mm or 2.0 mm).

[0044] As an optional implementation, in the cement pressure board layer, the joints of the cement pressure boards are butt-jointed with tongue and groove, which are closed on the outside but not on the inside.

[0045] As an optional implementation, the angle steel fixing piece includes an angle steel and a fixing nail.

[0046] As an optional implementation, in the high-strength cement pressure plate, the cement pressure plate at the position where the angle steel is fixed is made thin to ensure the flatness of the surface after the angle steel is constructed.

[0047] As an optional implementation, in the high-strength cement pressure plate, the thickness of the cement pressure plate at the position where the angle steel is fixed is more than 5 mm thinner than the overall thickness of the high-strength cement pressure plate, so that the angle steel does not bulge out after being fixed.

[0048] For example, the total thickness of the high-strength cement pressure plate is ≥2 cm, and the thickness of the cement pressure plate at the angle steel fixing position is made thinner so that it is recessed by more than 5 mm to ensure the flatness of the plane after the angle steel is constructed.

[0049] As an optional implementation, the surface of the angle steel fixing piece is coated with a waterproof coating, for example, a flexible waterproof coating.

[0050] As an optional implementation, the cement pressure plate adopts a high-strength cement pressure plate.

[0051] As an optional embodiment, in the back waterproof mortar layer, the pre-buried grouting pipe and grouting conduit are used to inject grouting material through the pre-buried grouting pipe to seal water seepage cracks when water seepage occurs after the wall of the waterproof grouting material layer is finally set and the formwork is removed, or when water seepage occurs during use of the maintenance structure on the back water surface of the ground-connected wall structure.

[0052] As an optional embodiment, in the back waterproof mortar layer, the grouting pipe and the grouting conduit may contain grouting material, which can expand into a foam when exposed to water and become an elastic resin body when there is no water, and can effectively seal water seepage cracks.

[0053] As an optional embodiment, the grouting material includes a two-component elastomeric polyurethane.

[0054] The repair structure of the back-to-water surface of the ground-connected wall structure provided by this application uses high-strength waterproof grouting material (mainly composed of cement and mortar, with epoxy resin, polyurea, waterproofing agent, etc.) and flexible waterproof coating to perfectly bond and form an integral body. At the same time, the fluidity of the high-strength waterproof grouting material will fill the gaps between the ground-connected wall and the columns, beams, and bottom plates as much as possible, and form an integral, complete and closed waterproof layer on the water-facing surface with the flexible waterproof coating. The high-strength waterproof wall formed by the high-strength waterproof grouting material can replace the exterior wall of the newly built reinforced concrete structure, saving space and avoiding the difficulty of pouring.

[0055] The maintenance structure of the back water surface of the ground-connected wall structure provided in the present application adopts a cement pressure plate with a flexible waterproof layer attached to the back of the formwork, so that the flexible waterproof layer becomes the water-facing waterproof layer of the cement pressure plate, and at the same time, the waterproof layer is perfectly bonded to the grouting wall to form a waterproof layer on the back water surface of the grouting wall, thereby having multiple functions, being water pressure-resistant, mildew-proof, and moisture-proof.

[0056] The maintenance structure of the back water surface of the ground-connected wall structure provided in this application uses cement pressure plates as inner lining plates to provide a base layer for interior decoration, without the need for release agents, inner moisture-proof layers, etc. The cement pressure plates are butt-jointed at the joints, with the outside closed but the inside closed, to ensure the continuity of the waterproof coating and the continuity of the grouting material without leakage. The pressure plate at the angle steel fixing point is made thinner by more than 5mm, but the total thickness must still be ensured to be ≥15mm to avoid cracking of the pressure plate during grouting due to being too thin, while also making the surface smooth after the angle steel is fixed without affecting subsequent decoration.

[0057] In a second aspect, the present application provides a construction method for the maintenance structure of the back water surface of the above-mentioned ground-connected wall structure, comprising the following steps:

[0058] (1) Remove the partition walls and drainage ditches in the basement and clean up the remaining structural components;

[0059] (2) Curtain grouting, including the following steps:

[0060] Inorganic grouting material and acrylate grouting material are sequentially injected into the water-facing surface of the ground-connected wall to obtain a double-layer grouting water-stopping curtain;

[0061] (3) Deep grouting of ground-anchored wall, including the following steps:

[0062] After the acrylate grouting water-stopping curtain obtained in step (2) has no visible water leakage, a hole is drilled vertically on the wall surface around the original leakage part, and a hole is drilled parallel to the wall surface at the junction seam of the ground-connected wall structure including the column, beam plate, and bottom plate, so as to obtain a grouting hole, and grouting material is poured through the grouting hole for sealing and reinforcement; after the grouting is completed, if there is no leakage, the grouting needle is knocked out, the overflowed grouting material is cleaned, and the grouting hole is blocked and smoothed with a blocking agent to obtain the deep grouting layer of the ground-connected wall;

[0063] (4) Pre-buried grouting pipes and grouting conduits, including the following steps:

[0064] Grouting pipes and grouting ducts are pre-buried around the ground-connected wall structure except the ground-connected wall, and the grouting ducts are exposed.

[0065] (5) Pre-buried steel mesh support;

[0066] (6) using polymer cement waterproof mortar to spray a layer of waterproof mortar on the back surface of the overall structure behind the embedded steel mesh bracket to obtain a waterproof mortar layer on the back surface;

[0067] (7) Install steel mesh;

[0068] (8) Installing a cement pressure plate with a waterproof coating layer includes the following steps:

[0069] Before installing the cement pressure board, spray waterproof coating on the water-facing surface of the cement pressure board;

[0070] When installing and fixing the cement pressure plate, the formwork is supported on one side, and the side of the cement pressure plate containing the waterproof coating layer faces the waterproof mortar layer, and is fixed with angle steel, with a grouting material gap (or grouting wall) reserved in the middle, so that the formwork is fixed against (for example, closely attached to) the cement pressure plate;

[0071] (9) Pouring high-strength cement waterproof grouting material, including the following steps;

[0072] The grouting pipe is extended into the grouting material gap reserved in step (8), and the grouting material is poured from bottom to top, so that the grouting material and the steel mesh support and steel mesh located in the grouting material gap form a wall, that is, a high-strength cement waterproof grouting material layer.

[0073] In this application, the structural member refers to the ground-connected wall structure, including the ground-connected wall, beam-slab, bottom plate and column. The construction personnel strengthen the waterproof effect of the ground-connected wall and eliminate open water leakage by grouting and consolidating the soil from the interior to the back of the ground-connected wall (i.e., the water-facing surface of the ground-connected wall) to form a water-stop curtain.

[0074] As an optional implementation, step (2) also includes thickening the curtain grouting at the junction of the bottom of the ground-connected wall and the floor slab and the bottom slab to ensure the waterproof effect at this location.

[0075] As an optional embodiment, in step (2), the grouting of the inorganic grouting material (including cement-water glass grouting material and waterproof material (for example, special waterproof material)) comprises the following steps:

[0076] (211) Determining the depth, spacing and arrangement of the grouting holes specifically comprises the following steps:

[0077] Through design drawings, construction records, etc., collect and determine data such as the structural waterproof design structure, structural plate thickness, etc., so as to determine the drilling depth (the drilling depth penetrates the structural plate wall), drilling angle (especially for deformation joints, expansion joints and other parts with embedded waterstops, the waterstops should be avoided by oblique drilling to the cavity behind the waterstop to avoid damaging the waterstops) and select drill rods and grouting rods of appropriate lengths.

[0078] (212) Drill holes at the leakage points and install grouting rods. Use special grouting rods with ball valves to effectively prevent water and sand gushing after drilling and before grouting.

[0079] (213) Prepare grouting liquid according to the designed composition, install grouting pipes, and inject grouting into the leakage points. Stop grouting after no more visible water and mud overflows, and the grouting pressure and flow rate reach the set values. Observe and carry out secondary grouting reinforcement if necessary.

[0080] (214) After the grouting is completed, the grouting rod is cut off, and a waterproof plugging agent (e.g., waterproof plugging treasure, micro-expanding waterproof mortar, etc.) is used to seal the grouting hole to obtain an inorganic grouting water-stopping curtain set on the water-facing surface of the ground-connected wall structure.

[0081] As an optional embodiment, in step (2), the grouting of the acrylate grouting material comprises the following steps:

[0082] (221) Plum blossom-shaped curtain grouting drilling points are arranged around the junction of the ground-connected wall and the beams, columns, and bottom slabs, and in the middle of the ground-connected wall. Grouting holes are arranged along the bottom of the beam slab, the side of the column, and the middle leakage point.

[0083] (222) The grouting construction of acrylic acid grouting material comprises the following steps:

[0084] Prepare grouting material; grouting; after grouting, observe whether the leaking part is leaking; if there is still leakage, perform secondary grouting or increase the number of grouting holes and grouting at the leaking part; if there is no leakage, clean up the overflowed grouting material, remove the exposed grouting needle (or grouting nozzle), use a plugging agent to seal the grouting hole, compact and smooth it, and obtain an acrylate grouting water-stop curtain.

[0085] As an optional implementation, in step (221), the interval between the curtain grouting drilling points is 1-2m; the interval between the grouting holes is 1.5m; the drilling depth is ≥ the thickness of the ground-connected wall, and the hole diameter is ≯2cm (i.e., the hole diameter is not greater than 2cm).

[0086] As an optional implementation, in step (221), the grouting hole is flushed with water before grouting.

[0087] As an optional implementation, in step (222), the preparation of the grouting material includes the following steps: using a two-liquid high-pressure grouting machine, the two components A and B of the high-strength acrylate grouting material are mixed in a volume ratio of 1:1 to prepare the grouting material.

[0088] As an optional implementation, in step (3), a hole is drilled vertically on the wall within a range of not less than 500 mm around the original leakage part, and a hole is drilled parallel to the wall at the junction of the ground-connected wall structure including columns, beams, and bottom plates to obtain a grouting hole.

[0089] As an optional implementation, in step (3), the depth of the grouting holes is 1 / 3 to 1 / 2 of the thickness of the ground-anchored wall structure, and the spacing is 250 mm to 300 mm.

[0090] In the present application, holes are drilled vertically on the wall surface around the original leakage part, holes are drilled parallel to the wall surface at the junction seams of the ground-connected wall structure including columns, beams, and bottom plates to obtain grouting holes, and then grouting materials are poured through the grouting holes to seal and reinforce the inside of the ground-connected wall. That is, the gaps in the ground-connected wall obtained by pouring in the prior art, which are not dense and have easy leakage due to the presence of gravel and soil, are blocked to form a solid wall.

[0091] As an optional implementation, in step (4), the ground-anchored wall structure other than the ground-anchored wall includes the bottom of the beam slab, the top of the base slab and the column.

[0092] As an optional implementation, the pre-buried grouting pipes are laid flat along the bottom of the beam slab and the top of the base plate in parallel to the wall surface of the ground-connected wall.

[0093] As an optional implementation, step (4) further includes the following steps:

[0094] Before pre-burying the grouting pipes and grouting ducts, the surface of the ground-connected wall is washed with high pressure to remove exposed attachments on the inner wall surface and steel bar surface of the ground-connected wall.

[0095] As an optional implementation, in step (5), the steel mesh bracket (or steel bar head) is pre-embedded in the ground-connected wall so that the length of the exposed steel bar head is at least half the thickness of the grouting material plus the thickness of the waterproof mortar (i.e., the length of the exposed steel bar head ≥ the thickness of the grouting material / 2 + the thickness of the waterproof mortar, for example ≥5.5mm), ensuring that the steel mesh is installed in the middle of the grouting wall section.

[0096] As an optional implementation, in step (6), the back water surface waterproof mortar includes a water-stopping one of polymer cement waterproof mortar and waterproof mortar mixed with waterproofing agent, which has an anti-seepage effect and improves the anti-seepage property of the ground-connected wall.

[0097] As an optional implementation, in step (8), the cement pressure plate joints are butt-jointed, and the notch on one side of the tongue (or joint or joint) is fully coated with pure polyurea waterproof coating, and the other side is only applied to half the thickness (i.e., applied to the facade, or only applied to the vertical surface perpendicular to the cement pressure plate plane). The waterproof coating can be bonded to the post-cast high-strength waterproof grouting material to form a whole, ensuring the continuity and integrity of the waterproof layer on the water-facing surface of the grouting wall.

[0098] This application uses a cement pressure plate to first spray a flexible waterproof layer, and then stick it on the template, so that the waterproof layer becomes the water-facing waterproof layer of the cement pressure plate, and at the same time perfectly bonds with the grouting wall to form the water-receiving waterproof layer of the grouting wall. It has multiple functions, and is both water-pressure-resistant and waterproof, and mildew-proof and moisture-proof.

[0099] As an optional implementation, in step (8), angle steel fixing grooves are reserved on both sides of the T-shaped joint where the cement pressure plate is connected to the tongue and groove, and the cement pressure plate is fixed to the wall surface at the grooves using a special angle steel fixing piece (including angle steel and fixing nails), and a gap for grouting material is reserved during fixing. The angle steel and fixing nails need to be coated with flexible waterproof coating in advance, and pure polyurea waterproof coating is used in this embodiment.

[0100] As an optional implementation, in step (8), when installing and fixing the cement pressure plate, grouting holes are reserved every 1 m at the top of the template for extending the grouting pipe into the gap of the grouting material and pouring the grouting material.

[0101] In the present application, the grouting pipe extends into the bottom of the grouting material gap through the grouting hole, and the grouting material is poured from bottom to top, while being drawn outward and poured, and finally completely taken out. The steel mesh is located in the grouting material gap, and when the grouting material gap is filled with grouting, a wall is formed, that is, a waterproof grouting material layer, the thickness of which is not less than 5 cm.

[0102] As an optional implementation, in step (8), the grouting pipe is a soft hose.

[0103] As an optional embodiment, in step (8), when the waterproof coating is applied to the back of the cement pressure plate, the coating method includes at least one of spraying, rolling and brushing.

[0104] As an optional implementation, in step (8), the waterproof coating is a flexible waterproof coating; the flexible waterproof coating includes at least one of a polyurea waterproof coating and a high-strength polyurethane waterproof coating. The flexible waterproof coating has the characteristic of corrosion resistance.

[0105] In the present application, the waterproof coating can be bonded with the post-cast high-strength waterproof grouting material (i.e., the high-strength waterproof grouting material poured later) to form a whole, ensuring the continuity and integrity of the waterproof layer on the water-facing surface of the grouting wall. For example, the waterproof coating can be pure polyurea waterproof coating, high-strength polyurethane waterproof coating, etc., which are homogeneous with the materials added in the grouting material, compatible and firmly bonded.

[0106] In the present application, in step (9), the grouting pipe is extended into the grouting material gap reserved in step (8), and the high-strength cement waterproof grouting material is poured from bottom to top, so that the grouting material and the steel mesh support and steel mesh located in the grouting material gap form a wall, that is, a waterproof grouting material layer (or a high-strength cement waterproof grouting material layer); its thickness is not less than 5 cm, that is, the wall of the grouting material layer at the thinnest point is 5 cm thick. Among them, the main components of the high-strength cement waterproof grouting material are cement and mortar, with epoxy resin, polyurea, waterproofing agent, etc. The material body is fine and fine, without coarse aggregate, and there will be no vibration problem. Compared with conventional concrete, it can better fill and compact the cavity. At the same time, the pouring method from bottom to top can be used to cover all aspects, avoiding the problem that the top of the wall cannot be poured when pouring concrete. In addition, the high-strength cement waterproof grouting material is waterproof, which further ensures the waterproof safety here.

[0107] As an optional implementation, the construction method further includes grouting through a pre-buried grouting conduit and a grouting pipe, specifically comprising the following steps:

[0108] After the wall formed by the waterproof grouting material has completely set, remove the formwork and observe whether there is still water seepage. If there is still water seepage around or leakage occurs during later use, grouting can be done along the pre-buried grouting duct. Use a two-component elastomeric polyurethane grouting material. This grouting material can expand into a foam when it comes into contact with water, and become an elastic resin when there is no water, which can effectively seal water seepage cracks.

[0109] In the present application, the above technical features can be freely combined to form a new technical solution without conflicting with each other.

[0110] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0111] (1) The maintenance structure of the back surface of the ground-connected wall structure provided in this application adopts four waterproof defenses, namely, a double-layer grouting waterproof curtain layer, a back surface waterproof mortar layer, a waterproof grouting material layer, and a corrosion-resistant flexible waterproof coating layer, to ensure the waterproof effect of the basement in all aspects, especially the waterproof effect of the basement used in high-end application scenarios such as clubs and office buildings;

[0112] (2) The maintenance structure of the back water surface of the ground-connected wall structure of the present application does not need to use the existing partition wall drainage ditch, so there is no space inside the wall to accumulate dirty water, which saves space and is safe and clean;

[0113] (3) The present application adds a waterproof layer on the back side and a waterproof layer on the front side of the ground-connected wall structure, and at least one flexible waterproof layer is provided to prevent leakage hazards; in addition, the waterproof layer can isolate toxic gases and ensure the air quality safety of the basement; the maintenance structure has the same lifespan as the building, protects the ground-connected wall steel bars to reduce corrosion, and improves structural safety;

[0114] (4) In the repair structure of the back water surface of the ground-connected wall structure provided by the present application, the pre-buried grouting pipe can further repair the gap between the ground-connected wall and the column, beam plate, and bottom plate. This is a weak point in waterproofing and is tightly sealed. If leakage occurs, it can also be used for repair grouting, so one pipe has multiple uses;

[0115] (5) In the present application, double-layer curtain grouting is performed by first using a special grouting rod with a ball valve to inject inorganic grouting material behind the ground-connected wall structure to consolidate the mud and sand and block large leaks; then a high-elastic acrylate grouting liquid is used for back-wall grouting to form a rubber-like gel curtain on the water-facing surface of the ground-connected wall structure to repair (or reconstruct) the flexible waterproof layer on the water-facing surface and serve as a new waterproof layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0116] Figure 1 This is a schematic diagram of a backwater surface maintenance structure of a ground-connected wall structure according to the present application;

[0117] Figure 2 for Figure 1 Enlarged view of the middle interface A;

[0118] Figure 3 It is a schematic diagram of the docking and waterproof structure of the cement pressure plate as the inner lining plate;

[0119] Figure 4 It is a plan view of the fixing structure at the T-shaped joint of the cement pressure plate;

[0120] Figure 5 It is a cross-sectional schematic diagram of the fixing structure at the T-joint of the cement pressure plate.

[0121] Among them, the figures are marked as: 1-double-layer grouting water-stop curtain, 2-deep grouting layer of ground-connected wall, 3-back water waterproof mortar layer, 4-waterproof grouting material layer, 5-waterproof coating layer, 6-cement pressure plate layer, 7-embedded grouting pipe, 8-steel mesh bracket, 9-steel mesh, 10-angle steel. DETAILED DESCRIPTION

[0122] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0123] The experimental methods in the following examples without specifying specific conditions are usually measured according to national standards. If there is no corresponding national standard, it is carried out according to the general international standards, conventional conditions, or according to the conditions recommended by the manufacturer. Unless otherwise specified, the various raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.

[0124] Some embodiments of the present application provide a maintenance structure for the back water surface of a ground-connected wall structure, comprising a ground-connected wall structure, a double-layer grouting water-stopping curtain 1 on the water-facing surface of the ground-connected wall structure, a deep grouting layer 2 of the ground-connected wall, a waterproof mortar layer 3 on the back water surface of the ground-connected wall structure, a waterproof grouting material layer 4, a waterproof coating layer 5 and a cement pressure plate layer 6; wherein,

[0125] The ground-connected wall structure includes ground-connected walls, beam-slabs, bottom plates and columns;

[0126] The double-layer grouting waterproof curtain 1 includes an inorganic grouting waterproof curtain and an acrylate grouting waterproof curtain;

[0127] The deep grouting layer 2 of the ground-connected wall includes grouting materials poured into the grouting holes formed by drilling holes in the ground-connected wall and a plugging agent used to plug the grouting holes;

[0128] The back water surface waterproof mortar layer 3, the waterproof grouting material layer 4, the waterproof coating layer 5 and the cement pressure plate layer 6 are sequentially arranged on the back water surface of the ground-connected wall structure;

[0129] The back waterproof mortar layer 3 includes waterproof mortar and pre-buried grouting pipes 7 and grouting conduits (not shown);

[0130] The waterproof grouting material layer 4 includes waterproof grouting material, an embedded steel mesh support 8 and a steel mesh 9 for lining;

[0131] The waterproof coating layer 5 is coated on the water-facing surface of the cement pressure plate layer 6;

[0132] The cement pressure plate layer 5 comprises a cement pressure plate, a waterproof coating 5 at the joints of the cement pressure plate, an angle steel fixing piece 10 and a waterproof grouting material.

[0133] In some embodiments, the thickness of the waterproof mortar layer on the back water surface is 0.5-1.5 cm (eg, 0.8 cm, 1 cm, or 1.2 cm).

[0134] In some embodiments, the waterproof grouting material includes cement, mortar, epoxy resin, polyurea and waterproof coating.

[0135] In some embodiments, the thickness of the waterproof grouting layer is ≥5 cm.

[0136] In some embodiments, the waterproof coating layer has a thickness of 1.5 to 2.0 mm (eg, 1.5 mm or 2.0 mm).

[0137] In some embodiments, in the cement pressure board layer, the joints of the cement pressure boards are butt-jointed with tongue and groove, which are closed on the outside but not on the inside.

[0138] In some embodiments, the angle steel fixing member includes an angle steel and a fixing nail.

[0139] In some embodiments, in the high-strength cement pressure plate, the cement pressure plate at the angle steel fixing location is made thinner to ensure the flatness of the plane after the angle steel is constructed. For example, the total thickness of the high-strength cement pressure plate is ≥2mm, and the cement pressure plate at the angle steel fixing location is made thinner so that it is recessed by more than 5mm to ensure the flatness of the plane after the angle steel is constructed.

[0140] In some embodiments, the surface of the angle steel fixing is coated with a waterproof coating, for example, a corrosion-resistant flexible waterproof coating.

[0141] Example 1

[0142] A maintenance structure for the back water surface of a ground-connected wall structure, such as Figure 1 and Figure 2 As shown, it includes a ground-connected wall structure, a double-layer grouting water-stop curtain 1 on the water-facing surface of the ground-connected wall structure, a deep grouting layer 2 of the ground-connected wall, a waterproof mortar layer 3 on the back surface of the ground-connected wall structure, a waterproof grouting material layer 4, a waterproof coating layer 5 and a cement pressure plate layer 6; wherein,

[0143] The ground-connected wall structure includes ground-connected walls, beam-slabs, bottom plates and columns;

[0144] The double-layer grouting waterproof curtain 1 includes an inorganic grouting waterproof curtain and an acrylate grouting waterproof curtain intersecting each other, wherein the inorganic grouting waterproof curtain is used to block large leakage, and the acrylate grouting waterproof curtain forms an integral waterproof layer on its outer side, thereby effectively improving the waterproof effect;

[0145] The deep grouting layer 2 of the ground-connected wall includes a permeable epoxy resin grouting material injected into the grouting holes drilled in the ground-connected wall and a polymer waterproof mortar or epoxy mortar plugging agent used to block the grouting holes;

[0146] The back water surface waterproof mortar layer 3, the waterproof grouting material layer 4, the corrosion-resistant flexible waterproof coating layer 5 and the high-strength cement pressure plate 6 are sequentially arranged on the back water surface of the ground-connected wall structure;

[0147] The back waterproof mortar layer 3 includes high-strength waterproof mortar and pre-buried stainless steel grouting pipes 7 and grouting conduits;

[0148] The waterproof grouting material layer 4 includes high-strength waterproof grouting material, an embedded steel mesh support 8 and a steel mesh 9 for lining;

[0149] The waterproof coating layer 5 is formed by coating the water-facing surface of the cement pressure plate layer with a corrosion-resistant flexible waterproof coating. Figure 3 As shown; the thickness of the waterproof coating layer is 1.5mm;

[0150] The cement pressure plate layer 6 includes a cement pressure plate (thickness greater than or equal to 2 cm), a corrosion-resistant flexible waterproof coating (such as Figure 3 As shown), angle steel fixing member 10 (as Figure 4 Shown and Figure 5 As shown) and high-strength waterproof grouting material; wherein, the angle steel fixing member 10 includes an angle steel (thickness is 3mm) and a fixing nail, and its surface is coated with corrosion-resistant flexible waterproof coating.

[0151] The construction method of the maintenance structure of the back water surface of the above-mentioned ground-connected wall structure comprises the following steps:

[0152] Step S1: Remove the partition walls and drainage ditches in the basement, leaving only structural components, such as ground-connected walls, beams, bottom plates, columns, etc., and clean them up;

[0153] Step S2: Curtain grouting, including the following steps: grouting inorganic grouting material (step S21) and acrylate grouting material (step S22) are sequentially performed on the water-facing surface of the ground-connected wall (i.e., the outer side of the ground-connected wall) to obtain a double-layer grouting waterproof curtain; at the same time, thickening the grouting at the junction of the wall bottom and the beam slab and the bottom slab to obtain a thickened double-layer grouting waterproof curtain. Specifically, the waterproof effect of the ground-connected wall is enhanced by consolidating the soil behind the ground-connected wall to form a waterproof curtain, eliminating open water leakage, and the curtain needs to be thickened at the junction of the wall bottom and the floor slab and the bottom slab to ensure the waterproof effect there.

[0154] Specifically, step S21: grouting of inorganic grouting material (including cement-water glass grouting material and special waterproof material) includes the following steps.

[0155] Step S211: Determine the depth, spacing and arrangement of the grouting holes: collect and determine data such as the structural waterproof design structure and the thickness of the structural plate through design drawings and construction records, so as to determine the drilling depth (the drilling depth penetrates the structural plate wall), the drilling angle (especially for deformation joints, expansion joints and other parts with embedded waterstops, the waterstop should be avoided by oblique drilling to the cavity behind the waterstop to avoid damaging the waterstop) and select the appropriate length of drill rod and grouting rod.

[0156] Step S212: drilling a hole at the leakage point, installing a grouting rod, and using a special grouting rod with a ball valve to effectively prevent water and sand gushing after drilling and before grouting.

[0157] Step S213: prepare grouting liquid according to the designed composition. After the grouting machine is debugged and qualified, install the grouting pipe and grout the leakage point. After grouting until no clear water and mud overflow, and the grouting pressure and flow rate reach the set value, stop grouting; and observe and perform secondary grouting reinforcement if necessary.

[0158] Step S214: After the grouting is completed, the grouting rod is cut off, and a waterproof plugging agent (for example, at least one of waterproof plugging agent, micro-expansion waterproof mortar, etc.) is used to seal the grouting hole to obtain an inorganic grouting water-stopping curtain set on the water-facing surface of the ground-connected wall structure.

[0159] Step S22: The grouting construction method of the acrylate grouting material includes the following steps.

[0160] Step S221: For the water-facing surface of the inorganic grouting water-stop curtain obtained in step S214, the curtain grouting drilling points are evenly arranged in a plum blossom shape every 1-2 meters along the junctions of the surrounding ground-connected walls with beams, columns, and bottom plates, and in the middle of the wall. Grouting holes are arranged every 1.5 meters along the bottom of the beams, the sides of the columns, and the middle leakage points. The drilling depth is ≥ the thickness of the ground-connected wall, and the hole diameter is ≯2 cm. The grouting holes are rinsed with water before grouting.

[0161] Step S222: Grouting construction (including observation and secondary grouting): Preparation of grouting materials. According to the construction dosage, the two components A and B of high-strength acrylate grouting materials are mixed in a volume ratio of 1:1 using a two-liquid high-pressure grouting machine. The inner wall of the grouting machine should be dry and free of dirt before construction.

[0162] Step S223: After the grouting is completed, check whether there is water seepage at the leakage site 72 hours later. If there is still water leakage, secondary grouting should be carried out or the grouting holes at the repeated leakage site should be increased and grouting should be carried out until there is no obvious leakage on the surface of all concrete structures. If there is no water seepage and it is confirmed that there is no leakage, the overflowed grouting material can be cleaned and removed, and the exposed grouting nozzle (or needle) can be removed. The grouting holes are sealed, compacted, and smoothed with a plugging agent such as epoxy mortar or plugging treasure to finally obtain an acrylate grouting water-stop curtain.

[0163] Step S3: deep grouting of the ground-anchored wall, including the following steps:

[0164] After there is no obvious water leakage from the acrylate grouting water-stopping curtain in step S2, grouting holes are drilled within a range of not less than 500 mm around the leakage point of the ground-connected wall structure, and the depth of the grouting holes is 1 / 3 to 1 / 2 of the thickness of the ground-connected wall structure, and the spacing is 250 mm to 300 mm; the grouting holes are injected with penetrating epoxy resin grouting material to seal and reinforce defects such as concrete cracks in the ground-connected wall structure.

[0165] After the grouting is completed, observe for 1 to 2 days to confirm that there is no leakage, knock out the grouting needle, clean up the overflowed grouting material; and use polymer waterproof mortar or epoxy mortar to seal and smooth the grouting holes to obtain the deep grouting layer 2 of the ground-connected wall.

[0166] Step S4: pre-buried stainless steel grouting pipe 7 and grouting conduit, such as Figure 2 As shown, the specific steps include: high-pressure washing of the ground-connected wall surface to remove exposed attachments on the inner wall surface and the steel bar surface of the ground-connected wall; pre-embedding stainless steel grouting pipes 7 and grouting conduits around the ground-connected wall structure other than the ground-connected wall, such as the bottom of the beam slab, the top of the bottom plate, the column, etc., and exposing the grouting conduits.

[0167] Step S5: pre-embed the steel mesh support 8, such as Figure 2 As shown, the length of the exposed steel bar head is about 3.5 cm; note that the length of the exposed steel bar head is at least half the thickness of the grouting material plus the thickness of the waterproof mortar, ensuring that the steel mesh 9 is installed in the middle of the grouting wall section.

[0168] Step S6: Use polymer cement waterproof mortar to spray a layer of back-water surface waterproof mortar on the above whole to obtain a back-water surface waterproof mortar layer 3 with a thickness of about 1 cm.

[0169] Step S7: Follow Figure 1 and Figure 2 The structure shown is installed with a steel mesh 9.

[0170] Step S8: installing the cement pressure board containing the waterproof coating layer, including the following steps.

[0171] Before installing the cement pressure board, a 1.5 mm thick pure polyurea waterproof coating (i.e., corrosion-resistant flexible waterproof coating) is sprayed on the back of the cement pressure board (i.e., the side not in contact with the above-mentioned back-to-water waterproof mortar layer, or the water-facing side of the cement pressure board) to obtain a cement pressure board containing a waterproof coating layer 5.

[0172] Among them, the joints of cement pressure plates are butt-jointed with tongue and groove, with a spacing of 1 to 3 cm. Figure 3 As shown, the concave part on one side of the tongue-and-groove (or joint or joint) is fully coated with pure polyurea waterproof coating, and only half the thickness is required on the other side. The waterproof coating can be bonded with the post-cast high-strength waterproof grouting material to form a whole, ensuring the continuity and integrity of the waterproof layer on the water-facing surface of the grouting wall. In addition, angle steel fixing grooves are reserved on both sides of the T-shaped joint where the cement pressure plate butts the tongue-and-groove, and special angle steel fixing parts (including angle steel 10 and fixing nails) are used to fix the cement pressure plate to the wall at the grooves, such as Figure 4As shown, a gap of grouting material is reserved in the middle when fixing; wherein, according to the fixed position of the angle steel relative to the cement board pressure plate, the angle steel is fixed on the wall in advance to avoid the situation where the angle steel cannot be installed after the pre-embedded steel mesh bracket and the steel mesh. The angle steel 10 and the fixing nails need to be painted with flexible waterproof coating in advance. This embodiment uses pure polyurea waterproof coating. The total thickness of the high-strength cement pressure plate is ≥2cm, and the cement pressure plate at the angle steel fixing position is made thin so that it is concave by more than 5mm, such as Figure 5 As shown, to ensure the flatness of the surface after the angle steel construction is completed.

[0173] When installing and fixing the cement pressure plate, support the formwork on one side, and make one side of the cement pressure plate containing the waterproof coating layer 5 contact the waterproof mortar layer 3 on the back surface, so that the cement pressure plate is close to the formwork. In addition, grouting holes are reserved at every 1m on the top of the formwork, so that the grouting pipe can be inserted into the gap of the grouting material and the grouting material can be poured.

[0174] Step S9: pouring high-strength cement waterproof grouting material, including the following steps;

[0175] The grouting pipe is extended into the bottom of the grouting material gap reserved in step S8 through the above-mentioned grouting hole, and the high-strength cement waterproof grouting material is poured into the steel mesh support and the steel mesh from bottom to top through the grouting material gap reserved when fixing the cement pressure plate, and the grouting pipe is drawn out while pouring, so that the grouting material and the steel mesh support and steel mesh located in the grouting material gap form a wall, and a high-strength cement waterproof grouting material layer 4 is obtained, and the wall of the grouting material layer at the thinnest point is 5cm thick. Among them, the main components of the high-strength cement waterproof grouting material are cement and mortar, with epoxy resin, polyurea, waterproofing agent, etc., the material body is fine, there is no coarse aggregate, there will be no vibration problem, compared with conventional concrete, it can better fill and compact the cavity, and at the same time, the pouring method from bottom to top can be used to cover all aspects, avoiding the problem that the top of the wall cannot be poured when pouring concrete. And the high-strength cement waterproof grouting material is waterproof, which further ensures the waterproof safety here.

[0176] Step S10: Grouting is performed through the pre-buried grouting conduit and grouting pipe, including the following steps:

[0177] After the grouting wall is completely set, remove the formwork and observe whether there is still water seepage. If there is still water seepage around or leakage occurs during later use, grouting can be done along the pre-buried grouting duct. Use a two-component elastomeric polyurethane grouting material. This grouting material can expand into a foam when it comes into contact with water, and become an elastic resin when there is no water, which can effectively seal water seepage cracks.

[0178] Clean up the site and hand over to the interior decoration unit.

Claims

1. A maintenance structure for the back water surface of a ground-connected wall structure, characterized in that: It comprises a ground-connected wall structure, a double-layer grouting water-stopping curtain 1 on the water-facing surface of the ground-connected wall structure, a deep grouting layer 2 of the ground-connected wall, a waterproof mortar layer 3 on the back surface of the ground-connected wall structure, a waterproof grouting material layer 4, a waterproof coating layer 5 and a cement pressure plate layer 6; wherein, The ground-connected wall structure comprises a ground-connected wall, a beam slab, a bottom slab and a column; The double-layer grouting waterproof curtain 1 includes an inorganic grouting waterproof curtain and an acrylate grouting waterproof curtain; The deep grouting layer 2 of the ground-connected wall includes grouting materials poured into the grouting holes drilled in the ground-connected wall and a plugging agent used to plug the grouting holes; The back-water surface waterproof mortar layer 3, waterproof grouting material layer 4, waterproof coating layer 5 and cement pressure layer 6 are sequentially arranged on the back-water surface of the ground-connected wall structure; The back waterproof mortar layer 3 includes waterproof mortar and pre-buried grouting pipes 7 and grouting conduits; The waterproof grouting material layer 4 includes a wall formed by waterproof grouting material, an embedded steel mesh support 8 and a steel mesh 9 for lining; The waterproof coating layer 5 is coated on the water-facing surface of the cement pressure plate layer; The cement pressure plate layer 6 includes cement pressure plates, waterproof coatings at the joints of the cement pressure plates, angle steel fixings and waterproof grouting materials.

2. The maintenance structure of the back water surface of the ground-connected wall structure according to claim 1 is characterized in that: The maintenance structure includes at least one of the following technical features: In the double-layer grouting water-stopping curtain, the inorganic grouting material includes cement, water glass and special waterproof material; In the double-layer grouting waterproof curtain, the acrylate grouting material includes two components A and B, and the volume ratio of A to B is 1:0.8-1.2; In the deep grouting layer of the ground-connected wall, the grouting material includes a permeable epoxy resin grouting material; the plugging agent includes at least one of a polymer waterproof mortar, an epoxy mortar and a leak-proof sealant; In the back waterproof mortar layer, the waterproof mortar includes at least one of polymer cement waterproof mortar and waterproof mortar mixed with waterproofing agent; In the back waterproof mortar layer, the pre-buried grouting pipe comprises a stainless steel grouting pipe; In the waterproof grouting material layer or the cement pressure board layer, the waterproof grouting material includes cement, mortar, epoxy resin, polyurea and waterproof coating; The waterproof coating layer comprises a waterproof coating, and the waterproof coating is a flexible waterproof coating.

3. The maintenance structure of the back water surface of the ground-connected wall structure according to claim 1 is characterized in that: The maintenance structure includes at least one of the following technical features: The thickness of the waterproof mortar layer on the back surface is 0.5 to 1.5 cm; The thickness of the waterproof grouting material layer is ≥5cm; The thickness of the waterproof coating layer is 1.5 to 2.0 mm.

4. The maintenance structure of the back water surface of the ground-connected wall structure according to claim 2 is characterized in that: The flexible waterproof coating includes at least one of a polyurea waterproof coating and a high-strength polyurethane waterproof coating; or the same waterproof coating as that in the waterproof grouting material layer is used.

5. The maintenance structure of the back water surface of the ground-connected wall structure according to claim 1 is characterized in that: In the cement pressure plate layer, the cement pressure plate joints are butt-jointed with tongue and groove, which are closed outside but not inside; the angle steel fixing piece includes an angle steel and a fixing nail, and the surface of the angle steel fixing piece is coated with a waterproof coating; In the high-strength cement pressure plate, the thickness of the cement pressure plate at the angle steel fixing position is more than 5 mm thinner than the overall thickness of the high-strength cement pressure plate, so that the angle steel does not protrude after being fixed; In the back waterproof mortar layer, the grouting pipe and the grouting conduit may contain grouting material, which can expand into a foam body when in contact with water and become an elastic resin body when there is no water, and can effectively block water seepage cracks.

6. A construction method for repairing the back water surface of a ground-connected wall structure according to any one of claims 1 to 5, characterized in that: The following steps are involved: (1) Remove the partition walls and drainage ditches in the basement and clean up the remaining structural components; (2) Curtain grouting, including the following steps: Inorganic grouting material and acrylate grouting material are sequentially injected into the water-facing surface of the ground-connected wall to obtain a double-layer grouting water-stopping curtain; (3) Deep grouting of ground-anchored wall, including the following steps: After the acrylate grouting water-stopping curtain obtained in step (2) has no visible water leakage, a hole is drilled vertically on the wall surface around the original leakage part, and a hole is drilled parallel to the wall surface at the junction seam of the ground-connected wall structure including the column, beam plate, and bottom plate to obtain a grouting hole, and a grouting material is poured through the grouting hole for sealing and reinforcement; after the grouting is completed, if there is no leakage, the grouting needle is knocked out, the overflowed grouting material is cleaned, and the grouting hole is blocked and smoothed with a blocking agent to obtain the deep grouting layer of the ground-connected wall; (4) Pre-buried grouting pipes and grouting conduits, including the following steps: Pre-buried grouting pipes and grouting conduits around the ground-connected wall structure except the ground-connected wall, and the grouting conduits are exposed; (5) Pre-buried steel mesh support; (6) using polymer cement waterproof mortar to spray a layer of waterproof mortar on the back surface of the overall structure behind the embedded steel mesh bracket to obtain a waterproof mortar layer on the back surface; (7) Install steel mesh; (8) Installing a cement pressure plate with a waterproof coating layer includes the following steps: Before installing the cement pressure board, spray waterproof coating on the water-facing surface of the cement pressure board; When installing and fixing the cement pressure plate, support the formwork on one side, with the side of the cement pressure plate containing the waterproof coating layer facing the waterproof mortar layer, fix it with angle steel, and reserve a gap for grouting material in the middle so that the formwork is fixed against the cement pressure plate; reserve grouting holes every 1m above the formwork; (9) Pouring high-strength cement waterproof grouting material, including the following steps; The grouting pipe is extended into the grouting material gap reserved in step (8), and the grouting material is poured from bottom to top, so that the grouting material and the steel mesh support and steel mesh located in the grouting material gap form a wall, that is, a waterproof grouting material layer.

7. The construction method of the maintenance structure of the back water surface of the ground-connected wall structure according to claim 6 is characterized in that: Step (2) also includes thickening curtain grouting at the junction of the bottom of the ground-connected wall and the floor slab and bottom slab.

8. The construction method of the maintenance structure of the back water surface of the ground-connected wall structure according to claim 6 is characterized in that: The construction method comprises at least one of the following steps: (i) In the step (2), the grouting of the inorganic grouting material comprises the following steps: (211) Determining the depth, spacing and arrangement of the grouting holes specifically comprises the following steps: Determine the structural waterproof design structure and structural plate thickness data through design drawings and construction records, so as to determine the drilling depth and drilling angle and select the appropriate length of drill rod and grouting rod; (212) Drill holes at the leakage point and install grouting rods. Use special grouting rods with ball valves to effectively prevent water and sand gushing after drilling and before grouting. (213) Prepare grouting liquid according to the designed composition, install grouting pipes, and inject grouting into the leakage points. When no clear water or mud overflows and the grouting pressure and flow rate reach the set values, stop grouting; (214) After the grouting is completed, the grouting rod is cut off, and the grouting hole is sealed with a waterproof plugging agent to obtain an inorganic grouting water-stopping curtain set on the water-facing surface of the ground-connected wall structure; (ii) In the step (2), the grouting of the acrylate grouting material comprises the following steps: (221) Arrange plum blossom-shaped curtain grouting drilling points around the junction of the ground-connected wall and the beams, columns, and bottom slabs, and in the middle of the ground-connected wall. Arrange grouting holes along the bottom of the beam slab, the side of the column, and the middle leakage point; (222) The grouting construction of acrylic acid grouting material comprises the following steps: Prepare grouting material; grouting; after grouting, observe whether the leaking part is leaking; if there is still leakage, perform secondary grouting or increase the number of grouting holes and grouting at the repeated leaking part; if there is no leakage, clean up the overflowed grouting material, remove the exposed grouting needle, use a plugging agent to seal the grouting hole, compact and smooth it, and obtain an acrylate grouting water-stop curtain; (iii) Step (4) further includes the following steps: Before burying the grouting pipe and grouting conduit, high-pressure washing is performed on the surface of the ground-connected wall to remove exposed attachments on the inner wall surface and steel bar surface of the ground-connected wall; (iv) In step (8), the cement pressure plate is butted with tongue and groove at the joint, and the notch on one side of the tongue and groove is fully coated with pure polyurea waterproof coating, and only half the thickness is applied on the other side; (v) In step (8), angle steel fixing grooves are reserved on both sides of the T-shaped joint where the cement pressure plate is connected to the tongue and groove, and the cement pressure plate is fixed to the wall at the grooves using special angle steel fixing parts, and gaps for grouting are reserved during fixing; the angle steel and fixing nails need to be coated with flexible waterproof coating in advance; (vi) The construction method further comprises step (9): grouting is performed through the pre-buried grouting conduit and the grouting pipe, specifically comprising the following steps: After the grouting wall is completely set, remove the formwork and observe whether there is still water seepage. If there is still water seepage around or leakage occurs during later use, grouting can be done along the pre-buried grouting duct. Use a two-component elastomeric polyurethane grouting material. This grouting material can expand into a foam when it comes into contact with water, and become an elastic resin when there is no water, which can effectively seal water seepage cracks.

9. The construction method of the maintenance structure of the back water surface of the ground-connected wall structure according to claim 8 is characterized in that: In step (221), the interval between the curtain grouting drilling points is 1 to 2 m; the interval between the grouting holes is 1.5 m; the drilling depth is ≥ the thickness of the ground-connected wall, and the hole diameter is not greater than 2 cm; In step (221), the grouting hole is rinsed with water before grouting; In step (222), the preparation of the grouting material includes the following steps: using a two-liquid high-pressure grouting machine, the two components A and B of the high-strength acrylate grouting material are mixed in a volume ratio of 1:1 to prepare the grouting material.

10. The construction method of the maintenance structure of the back water surface of the ground-connected wall structure according to claim 7 is characterized in that: The construction method also includes at least one of the following technical features: In step (3), vertical holes are drilled on the wall within a range of not less than 500 mm around the original leakage part; the depth of the grouting holes is 1 / 3 to 1 / 2 of the thickness of the ground-connected wall structure, and the spacing is 250 mm to 300 mm; In step (4), the ground-connected wall structure other than the ground-connected wall includes the bottom of the beam slab, the top of the bottom slab and the column; In step (5), the steel mesh support is pre-buried in the ground-connected wall so that the length of the exposed steel bar head is at least half the thickness of the grouting material plus the thickness of the waterproof mortar; In step (6), the back-water surface waterproof mortar includes at least one of a polymer cement waterproof mortar and a waterproof mortar mixed with a waterproofing agent; In step (8), a corrosion-resistant flexible waterproof coating is applied on the back of the cement pressure plate, and the coating method includes at least one of spraying, rolling and brushing; In step (8), the waterproof coating is a flexible waterproof coating; the flexible waterproof coating includes at least one of a polyurea waterproof coating and a high-strength polyurethane waterproof coating.

Images