Construction method for treating water seepage of building basement floor

Abstract

The application relates to the technical field of water seepage treatment, in particular to a construction method for water seepage treatment of a basement floor of a building, which comprises the following steps: S1: organizing construction according to on-site construction conditions and process arrangement; S2: removing an original decoration surface layer; S3: removing floor concrete along the position of an existing grouting pipe, and the removal range is Phi 300*30mm; S4: low-pressure grouting of the existing grouting pipe; S5: water absorption treatment; S6: primary plugging treatment; S7: surrounding crack treatment; S8: removal of redundant grouting pipes; S9: removal hole sealing and secondary plugging; S10: pressure-smoothing benefit mortar; S11: superimposed layer construction; and S12: building ground recovery. The application has the effect of treating the water seepage condition of the floor.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of water seepage treatment, in particular to a construction method for water seepage treatment of a basement floor of a building. BACKGROUND

[0002] When a shield tunnel passes through existing buildings, the soil layer under the buildings is grouted and reinforced for safety to improve the bearing capacity of the soil. After the shield tunnel passes through and is re-pushed, the soil is disturbed, and a gap appears between the soil and the basement floor, causing underground water to flow into or seep onto the ground, resulting in water or dampness on the basement floor.

[0003] The existing method often only focuses on the surface and only performs surface treatment, which can be applicable to the case where the width is small and the cracks are shallow, but for wider, deeper or extended cracks, this method cannot fundamentally solve the seepage problem and does not fill and reinforce the inside of the cracks. Therefore, a new technical solution is needed to solve the above problems. SUMMARY

[0004] In order to deal with the water seepage of the floor, the application provides a construction method for water seepage treatment of a basement floor of a building.

[0005] The construction method for water seepage treatment of a basement floor of a building provided by the application adopts the following technical solution:

[0006] A construction method for water seepage treatment of a basement floor of a building includes the following steps:

[0007] S1: Organize construction according to the site construction conditions and process arrangement;

[0008] S2: Remove the original decorative surface layer: remove the original decorative surface layer to the floor structure layer around the existing grouting pipe of the water seepage, and the removal range is 1000mm*1000mm;

[0009] S3: Remove the floor concrete along the position of the existing grouting pipe, and the removal range is a circle with a diameter of 300mm, and the depth is 30mm (Φ300*30mm);

[0010] S4: Low-pressure grouting of the existing grouting pipe: select the grouting method according to the site water seepage condition, and perform grouting treatment, and grouting to the orifice;

[0011] S5: Water absorption treatment: drill a hole around the existing grouting pipe to embed a water absorption grouting nozzle, and inject hydrophilic polyurethane into the water absorption grouting nozzle;

[0012] S6: Initial plugging treatment: drill a hole around the existing grouting pipe and embed an initial plugging grouting nozzle, and inject an acrylic salt into the initial plugging grouting nozzle;

[0013] S7: Surrounding crack treatment: embedding crack grouting nozzle along the crack periphery, and injecting polyurea waterproof coating into the crack grouting nozzle;

[0014] S8: Excess grouting pipe cutting: cutting the part of the existing grouting pipe, water absorption grouting nozzle, primary plugging grouting nozzle, and crack grouting nozzle protruding from the bottom plate;

[0015] S9: Chiseling opening sealing and secondary plugging: sealing the chiseling opening of the bottom plate with plugging material, and injecting polyurea waterproof coating;

[0016] S10: Pressing and smearing cement mortar: pressing and smearing cement mortar on the surface of the bottom plate;

[0017] S11: Construction of composite layer: binding steel bars at the chiseling opening of the original decorative layer, and pouring concrete;

[0018] S12: Restoration of building ground: after the construction of the composite layer (13) is completed, the ground is restored to the original decorative layer.

[0019] By adopting the above technical scheme, firstly, low-pressure grouting is performed on the existing grouting pipe until the grout overflows from the pipe opening, so as to fill the gap between the basement bottom plate and the soil, treat the voiding of the basement bottom plate due to the disturbance of the lower soil, and cut off the path of groundwater upwelling; secondly, the hydrophilic polyurethane is used to absorb the residual moisture in the basement bottom plate reinforced concrete, so that it can be kept in a dry state as much as possible; since the acrylic salt can quickly dissolve in water to form a gel, the acrylic salt is used for primary plugging to fill the cracks of the basement bottom plate; the polyurea waterproof coating is used in two places, one is to inject the polyurea waterproof coating around the existing grouting pipe to fill the gap between the existing grouting pipe and the surrounding bottom plate concrete, and the other is to use it in the surrounding small cracks, which only need to be surface plugged, so that the construction is conducive to improving the stability of the basement bottom plate water seepage treatment.

[0020] Optionally, the step S4 further includes the following steps:

[0021] S4.1: The grouting uses 42.5 early strength ordinary Portland cement, and the cement slurry with a water-cement ratio of 0.7-1.1 and the double liquid slurry mixed by cement and water glass at a ratio of 1:1 are used;

[0022] S4.2: Key pressure: the initial pressure range of grouting is 0.1-0.2 Mpa, the grouting termination pressure is 0.2-0.3 Mpa, and the pressure is stabilized for 10 minutes;

[0023] S4.3: At the beginning of grouting, the grouting pipe is lowered to the hole bottom, the cement slurry is stirred according to the water-cement ratio requirement, the grouting pump is started, the cement slurry is pressed to the hole bottom, and the cement slurry is returned from the hole opening until the cement slurry is returned from the hole opening;

[0024] S4.4: hole flushing: after the grouting is completed, the hole is sealed.

[0025] By adopting the above technical scheme, the double slurry is adopted, and the low-pressure slow injection is performed to the hole to emerge slurry, which is beneficial to avoid damaging the basement floor. By the low-pressure slow injection, the gap between the basement floor and the soil is beneficial to be filled, the void condition of the basement floor due to the disturbance of the lower soil is handled, and the path of the underground water upwelling is cut off.

[0026] Optionally, the water absorption grouting nozzle in the step S5 is pre-buried to the position of 3 / 4 of the thickness of the floor. After the first injection of the hydrophilic polyurethane, the hydrophilic polyurethane is stopped for 10-15 seconds, and then the second injection of the hydrophilic polyurethane is performed.

[0027] By adopting the above technical scheme, the hydrophilic polyurethane has good hydrophilicity. By pre-buried to the position of 3 / 4 of the thickness of the floor and stopped for 10-15 seconds after the first injection, the hydrophilic polyurethane is beneficial to absorb the residual moisture in the reinforced concrete of the basement floor, so that the hydrophilic polyurethane is kept in a dry state as much as possible.

[0028] Optionally, the initial plugging grouting nozzle in the step S6 is located at a distance of 10-15 cm from the existing grouting pipe, and the initial plugging grouting nozzle is pre-buried to the position of 1 / 2 of the thickness of the floor along 45°.

[0029] By adopting the above technical scheme, the acrylic salt penetrates into the gap of the hydrophilic polyurethane that absorbs water and quickly solidifies to form a waterproof sealing colloid, so as to further prevent the water from seeping out of the floor, and the initial plugging of the floor is completed.

[0030] Optionally, the step S7 further includes the following steps:

[0031] S7.1: a 50mm*50mm V-shaped groove is opened at the crack of the floor;

[0032] S7.2: the crack grouting nozzle is pre-buried to the crack at 45°, and the polyurea waterproof coating is poured into the crack grouting nozzle;

[0033] S7.3: after the crack pouring is completed, the part of the crack grouting nozzle protruding from the floor is cut off and ground flat;

[0034] S7.4: the epoxy repair glue is used for sealing, and the sealing range is within 100mm around the crack grouting nozzle.

[0035] By adopting the above technical scheme, the polyurea waterproof coating has the advantages of deep waterproof and simple construction. The pouring state of the polyurea waterproof coating is convenient to observe through the V-shaped groove. After the crack pouring around the existing grouting pipe is completed, the overall water permeability of the floor is improved.

[0036] Optionally, the step S9 further includes the following steps:

[0037] S9.1: arranging the perforated grouting pipe along the periphery of the existing grouting pipe;

[0038] S9.2: vacuumizing the perforated grouting pipe after the sealing material is pressed and smoothed;

[0039] S9.3: injecting the polyurea waterproof coating into the perforated grouting pipe after the sealing material hardens.

[0040] By adopting the above technical scheme, the pipe wall of the perforated grouting pipe is provided with a plurality of regularly arranged small holes, which are beneficial to the uniform outflow of the grouting liquid into the concrete medium to be sealed; the injection of the polyurea waterproof coating into the perforated grouting pipe further fills the cracks in the basement floor and realizes secondary sealing; and the vacuumization of the perforated grouting pipe is beneficial to the removal of air interference and the full filling of the polyurea waterproof coating into the surrounding concrete cracks.

[0041] Optionally, the step S11 further includes the following steps:

[0042] S11.1: adding new stirrups, the stirrups being arranged in two directions;

[0043] S11.2: adding 180° hooked steel bars;

[0044] S11.3: the hooked steel bars are arranged in a quincunx shape, one end of the hooked steel bars is embedded into the floor with a depth of 15d, and the other end of the hooked steel bars is bound with the stirrups.

[0045] By adopting the above technical scheme, the stirrups are beneficial to improving the strength of the floor, and the hooked steel bars are beneficial to realizing the common stress of the superimposed layer and the original floor, so that the integrity of the floor can be better maintained under the action of the load.

[0046] Optionally, the water absorption grouting nozzle is provided with at least two, and the at least two water absorption grouting nozzles are respectively arranged in a ring array along the existing grouting pipe.

[0047] By adopting the above technical scheme, the number of the water absorption grouting nozzles is selected according to the water content or wetness of the floor, which is beneficial to reducing the water content in the floor and keeping the floor dry.

[0048] Optionally, the primary sealing grouting nozzle is provided with at least two, and the at least two primary sealing grouting nozzles are respectively arranged in a ring array along the existing grouting pipe.

[0049] By adopting the above technical scheme, the number of the primary sealing grouting nozzles is selected according to the cracking of the floor around the existing grouting pipe, which is beneficial to improving the efficiency of the primary sealing of the floor.

[0050] In summary, the present application includes the following beneficial technical effects:

[0051] First, low-pressure grouting is carried out in the existing grouting pipe until the grout overflows from the pipe opening, in order to fill the gap between the basement floor and the soil, treat the voiding of the basement floor due to disturbance of the lower soil, and cut off the path of groundwater upwelling; second, the hydrophilic polyurethane is used to absorb the residual moisture in the basement floor reinforced concrete, so as to keep it in a dry state as much as possible; since the acrylic salt can quickly dissolve in water to form a gel body, the acrylic salt is used for the first time to fill the cracks in the basement floor; the polyurea waterproof coating is used in two places, one is to inject polyurea waterproof coating around the existing grouting pipe to fill the gap between the existing grouting pipe and the surrounding floor concrete; the other is to use it in the surrounding small cracks, which only need to be surface sealed, so that the construction is conducive to improving the stability of the floor water seepage treatment. BRIEF DESCRIPTION OF DRAWINGS

[0052] Figure 1 is a schematic diagram of the construction method steps of the basement floor water seepage treatment of the present application;

[0053] Figure 2 is a schematic diagram of the basement floor water seepage treatment before the construction method steps of the present application;

[0054] Figure 3 is a schematic diagram of steps S2-S3 of the present application;

[0055] Figure 4 is a schematic diagram of steps S4-S7 of the present application;

[0056] Figure 5 is a schematic diagram of steps S8-S9 of the present application;

[0057] Figure 6 is a schematic diagram of step S10 of the present application;

[0058] Figure 7 is a schematic diagram of steps S11-S12 of the present application.

[0059] Reference signs: 1, decorative surface layer; 2, existing grouting pipe; 3, floor; 4, water absorption grouting nozzle; 5, first sealing grouting nozzle; 6, crack grouting nozzle; 7, web; 8, hooked steel bar; 9, sealing material; 10, benefit mortar; 11, perforated grouting pipe; 12, V-shaped groove; 13, superimposed layer. DETAILED DESCRIPTION

[0060] The following will be described in detail in combination with the accompanying drawings Figures 1-7 The present application will be further described in detail.

[0061] Reference Figures 1-7 A construction method for treating water seepage of a basement floor, comprising the following steps:

[0062] S1: Maintain the construction site and organize personnel construction according to the site construction conditions and process arrangement;

[0063] S2: Chisel off the original decorative layer 1: there is an existing grouting pipe 2 on the building bottom plate 3, and the existing grouting pipe 2 protrudes above the original decorative layer 1. The original decorative layer 1 is chiseled around the existing grouting pipe 2 that seeps water, and is chiseled to expose the structural layer of the bottom plate 3, and the chiseled range of the original decorative layer 1 is 1000mm*1000mm;

[0064] S3: Chisel off the structural layer of the bottom plate 3 around the existing grouting pipe 2, and the chiseled range of the bottom plate 3 is Φ300*30mm, in a conical shape;

[0065] S4: Low-pressure grouting of the existing grouting pipe 2: select a suitable grouting method for grouting treatment, and grouting to the orifice;

[0066] S5: Water absorption treatment: drill holes around the existing grouting pipe 2 and pre-bury the water absorption grouting nozzle 4, then inject hydrophilic polyurethane into the water absorption grouting nozzle 4;

[0067] S6: Initial plugging treatment: drill holes around the existing grouting pipe 2 and pre-bury the initial plugging grouting nozzle 5, then inject acrylic salt into the initial plugging grouting nozzle 5;

[0068] S7: Crack treatment: pre-bury the crack grouting nozzle 6 around the crack, and inject polyurea waterproof coating into the crack grouting nozzle 6;

[0069] S8: Excess grouting pipe cutting: cut off the part of the existing grouting pipe 2, water absorption grouting nozzle 4, initial plugging grouting nozzle 5, and crack grouting nozzle 6 that protrudes from the bottom plate 3 to avoid affecting the subsequent construction;

[0070] S9: Chiseled opening sealing and secondary plugging: use the plugging material 9 to plug the chiseled opening of the bottom plate 3, and inject polyurea waterproof coating;

[0071] S10: Pressing and smearing the benefit mortar 10: press and smear the benefit mortar 10 on the surface of the bottom plate 3, the thickness of the benefit mortar 10 is 5.0, and it is pressed and smeared in two layers;

[0072] S11: Construction of the composite layer 13: bind the reinforcement at the chiseled opening of the original decorative layer 1, and pour concrete;

[0073] S12: Building ground restoration: after the construction of the composite layer 13 is completed, the ground is restored to the original decorative layer 1.

[0074] When the existing grouting pipe 2 around the building floor 3 needs to be sealed and treated, first find the location of the existing grouting pipe 2, then remove the original decorative layer 1 with the existing grouting pipe 2 as the center and a range of 1000mm*1000mm, until the structure layer of the floor 3 is exposed. Then, the structure layer of the floor 3 is removed with the existing grouting pipe 2 as the center, and the excavation area is a Φ300*30mm tapered area. By observing the water inflow rate of the floor 3 excavation opening, the appropriate grouting method is selected. In this embodiment, the low-pressure grouting method is adopted.

[0075] First, low-pressure grouting is carried out in the existing grouting pipe 2 until the slurry overflows from the pipe opening, which is to fully fill the gap between the basement floor 3 and the soil, treat the basement floor 3 due to the disturbance of the lower soil, and cut off the path of groundwater upwelling; second, hydrophilic polyurethane is used to absorb the residual moisture in the basement floor 3 reinforced concrete, so that it can be kept in a dry state as much as possible; since the acrylic salt can quickly dissolve in water to form a gel, then the acrylic salt is used to initially seal and fill the cracks of the basement floor; polyurea waterproof coating is used in two places, one is to inject polyurea waterproof coating around the existing grouting pipe to fill the gap between the existing grouting pipe 2 and the surrounding floor concrete; the second is used in the surrounding small cracks, which only need to be surface sealed, and the water seepage treatment of the floor 3 is completed.

[0076] Specifically, in order to facilitate low-pressure grouting into the floor 3, step S4 further includes the following steps:

[0077] S4.1: The grouting adopts 42.5 early strength ordinary Portland cement, uses 0.7-1.1 water-cement ratio cement slurry and 1:1 cement-silicate mixed double liquid slurry. The use of double slurry, low-pressure slow injection to the orifice, is beneficial to avoid the damage of the basement floor 3 caused by high-pressure grouting;

[0078] S4.2: Key pressure: the initial pressure range of the grouting pressure is 0.1-0.2Mpa, the grouting termination pressure is 0.2-0.3Mpa, and the pressure is stabilized for 10 minutes;

[0079] S4.3: At the beginning of grouting, the grouting pipe is lowered to the bottom of the hole, the cement slurry is stirred according to the water-cement ratio requirement, the grouting pump is started, and the cement slurry is pressed to the bottom of the hole until the cement slurry returns from the orifice.

[0080] S4.4: Hole sealing and flushing: after grouting, the orifice is sealed.

[0081] Through the way of low-pressure slow injection, it is also beneficial to fully fill the gap between the basement floor 3 and the soil, treat the basement floor 3 due to the disturbance of the lower soil, and cut off the path of groundwater upwelling.

[0082] Specifically, referring to Figure 4 , the bottom end of the water absorption grouting nozzle 4 in step S5 is pre-buried at a position of 3 / 4 of the thickness of the bottom plate 3, and after the first injection of the hydrophilic polyurethane, it is stopped for 10-15s, and then the second injection of the hydrophilic polyurethane is performed.

[0083] The hydrophilic polyurethane is a polyurethane material with good hydrophilicity. By pre-buried the bottom end of the water absorption grouting nozzle 4 to a position of 3 / 4 of the thickness of the bottom plate 3, it is beneficial to ensure that the hydrophilic polyurethane can fully absorb the residual moisture in the basement bottom plate 3 reinforced concrete, so as to keep it in a dry state as much as possible. By stopping and then injecting the hydrophilic polyurethane again, it is beneficial to improve the quality of the hydrophilic polyurethane in absorbing water seepage.

[0084] Specifically, referring to Figure 4 , the primary plugging grouting nozzle 5 in step S6 is arranged at a distance of 10-15cm from the periphery of the existing grouting pipe 2, and the primary plugging grouting nozzle 5 is pre-buried to a position of 1 / 2 of the thickness of the bottom plate 3 along 45°.

[0085] Acrylate grouting reinforcement material performs well in underground engineering, which can significantly improve the impermeability of underground engineering, effectively prevent water seepage, and ensure the dryness and stability of underground structure. It has strong fluidity, can penetrate into fine cracks, and can also form a gel in water, which is used for primary plugging of water seepage points. In addition, the acrylate grouting material can also enhance the stability of the underground structure, disperse stress, reduce crack propagation and structural deformation. By pre-buried the bottom end of the primary plugging grouting nozzle 5 to a position of 1 / 2 of the thickness of the bottom plate 3, the acrylate flows in the internal gap of the hydrophilic polyurethane and quickly solidifies to form a waterproof sealing gel, thereby further preventing water seepage from the bottom plate 3.

[0086] Specifically, referring to Figure 4 , step S7 further includes the following steps:

[0087] S7.1: A V-shaped groove 12 with a size of 50mm*50mm is opened at the crack opening of the bottom plate 3;

[0088] S7.2: The crack grouting nozzle 6 is pre-buried to the crack at 45°, and the polyurea waterproof coating is poured into the crack grouting nozzle 6;

[0089] S7.3: After the crack pouring is completed, the part of the crack grouting nozzle 6 protruding from the bottom plate 3 is cut off and ground flat;

[0090] S7.4: The surface is sealed with epoxy repair glue, and the sealing range is 100mm around the crack grouting nozzle 6.

[0091] Since water seepage in the base slab 3 is often accompanied by cracks in the base slab 3, when it is necessary to treat the cracks in the base slab 3, firstly, a 50mm*50mm V-shaped groove 12 is cut at the crack opening in the base slab 3, then the crack injection nozzle 6 is pre-embedded at a 45° angle into the crack, and then polyurea waterproof coating is poured into the crack injection nozzle 6. The filling status of the polyurea waterproof coating is observed through the V-shaped groove 12. Finally, epoxy repair adhesive is applied as a cover, which ultimately helps to improve the overall water resistance of the base slab 3.

[0092] For details, see Figure 5 Step S9 further includes the following steps:

[0093] S9.1: Arrange perforated grouting pipes 11 around the perimeter of the existing grouting pipe 2;

[0094] S9.2: After the sealing material 9 is compacted, the grouting pipe 11 with holes is evacuated. The sealing material is a leak-stopping agent.

[0095] S9.3: After the sealing material 9 has hardened, inject polyurea waterproof coating into the grouting pipe 11.

[0096] The perforated grouting pipe 11 has numerous regularly arranged small holes on its wall. These holes facilitate the even flow of grouting fluid into the concrete medium requiring sealing. Injecting polyurea into the perforated grouting pipe 11 further fills the gaps within the basement floor slab 3, completing a secondary sealing process. Vacuuming the perforated grouting pipe 11 helps eliminate air interference, allowing the polyurea waterproof coating to better and more effectively fill the cracks.

[0097] For details, see Figure 7 Step S11 further includes the following steps:

[0098] S11.1: Add a new reinforcement bar 7. The reinforcement bar 7 is a single-layer bidirectional reinforcement bar, and the specification of the reinforcement bar 7 is grade III steel bar 12@150.

[0099] S11.2: Add 180° hook steel bar 8, and the specification of hook steel bar 8 is grade III steel bar 8@400*400;

[0100] S11.3: The hooked steel bars 8 are arranged in a quincunx pattern. One end of the hooked steel bars 8 is inserted into the bottom plate 3 at a depth of 15d, and the other end of the hooked steel bars 8 is tied to the top reinforcement 7.

[0101] The top reinforcement 7 helps to improve the strength of the bottom plate 3, and the hook reinforcement 8 helps the composite layer 13 and the original bottom plate 3 to share the load, thus maintaining the integrity of the bottom plate under load.

[0102] It is worth noting that, see Figure 4In order to reduce the water content inside the floor 3 and keep the floor 3 dry, the number of water absorption grouting nozzles 4 is at least two, and the at least two water absorption grouting nozzles 4 are respectively arranged in a ring array along the existing grouting pipe 2 as the axis.

[0103] Similarly, referring to Figure 4 In order to improve the efficiency of the initial plugging of the floor 3, the number of initial plugging grouting nozzles 5 is also at least two, and the at least two initial plugging grouting nozzles 5 are respectively arranged in a ring array along the existing grouting pipe 2 as the axis.

[0104] The working principle of a construction method for treating water seepage of a building basement floor is as follows:

[0105] When it is necessary to treat water seepage of the building floor 3, first, the location of the existing grouting pipe 2 is found, and then the original decorative surface layer 1 within a range of 1000mm*1000mm around the existing grouting pipe 2 is chiseled until the floor 3 structure layer is exposed. Then, a Φ300*30mm conical groove is chiseled in the floor 3 structure layer around the existing grouting pipe 2. By observing the water gushing rate of the floor 3 chiseled opening, a suitable grouting method is selected. In this embodiment, the low-pressure grouting method is adopted.

[0106] First, low-pressure grouting is carried out in the existing grouting pipe 2 until the grout overflows from the pipe opening, which is to fill the gap between the basement floor 3 and the soil, treat the voiding of the basement floor 3 due to disturbance of the lower soil, and cut off the path of groundwater upwelling; second, the hydrophilic polyurethane is to absorb the residual moisture in the reinforced concrete of the basement floor 3, so that it is kept in a dry state as much as possible; since the acrylic salt can quickly dissolve in water to form a gel, the acrylic salt is used to initially plug and fill the cracks of the basement floor; the polyurea waterproof coating is used in two places, one is to inject the polyurea waterproof coating around the existing grouting pipe to fill the gap between the existing grouting pipe 2 and the surrounding floor concrete; the other is to use it in the surrounding small cracks, which only need to be surface plugged, to complete the water seepage treatment of the floor 3.

[0107] In summary, the use of hydrophilic polyurethane solves the problem of moisture and water secretion of the floor 3, the use of acrylic salt initially plugs and solves the problem of concrete crack seepage around the existing grouting pipe 2 of the floor 3, and the use of polyurea waterproof coating for secondary plugging further enhances the waterproof sealing of the floor 3, which is conducive to improving the stability of treating water seepage of the floor 3.

[0108] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A construction method for treating water seepage of a basement floor of a building, characterized by, The method comprises the following steps: S1: according to the field construction conditions and process arrangement, organize construction; S2: chisel out the original decorative layer (1): chisel out the original decorative layer (1) to the bottom plate (3) structure surface around the existing grouting pipe (2) which seeps water, the chiseling range is 1000mm*1000mm; S3: chisel out the bottom plate (3) concrete along the position of the existing grouting pipe (2), the chiseling range is a circle with a diameter of 300mm, and the depth is 30mm (Φ300*30mm); S4: low pressure grouting of the existing grouting pipe (2): according to the seepage condition of the site, select the grouting method, carry out grouting treatment, and grout to the orifice; S5: water absorption treatment: drill holes and pre-bury water absorption grouting nozzle (4) along the periphery of the existing grouting pipe (2), and inject hydrophilic polyurethane into the water absorption grouting nozzle (4); S6: initial plugging treatment: drill holes and pre-bury initial plugging grouting nozzle (5) along the periphery of the existing grouting pipe (2), and inject acrylic salt into the initial plugging grouting nozzle (5); S7: surrounding crack treatment: pre-bury crack grouting nozzle (6) along the periphery of the crack, and inject polyurea waterproof coating into the crack grouting nozzle (6); S8: excess grouting pipe cutting: cut off the part of the existing grouting pipe (2), water absorption grouting nozzle (4), initial plugging grouting nozzle (5), crack grouting nozzle (6) which protrudes from the bottom plate (3); S9: chiseling mouth sealing and secondary plugging: use plugging material (9) to plug the chiseling mouth of the bottom plate (3), and inject polyurea waterproof coating; S10: press and smear the Yi cement mortar (10): press and smear the Yi cement mortar (10) on the surface of the bottom plate (3); S11: construction of the composite layer (13): bind the reinforcement on the chiseling mouth of the original decorative layer (1), and pour concrete; S12: building ground recovery: after the construction of the composite layer (13) is completed, the ground is recovered to the original decorative layer (1).

2. The construction method for treating water seepage of a basement floor of a building according to claim 1, characterized in that: The step S4 further comprises the following steps: S4.1: grouting uses 42.5 early strength ordinary portland cement, and uses cement slurry with a water-cement ratio of 0.7-1.1 and double liquid slurry mixed by cement and water glass 1:1; S4.2: key pressure: the grouting pressure uses the initial pressure range of 0.1-0.2Mpa, the grouting termination pressure is 0.2-0.3Mpa, and the pressure is stable for 10 minutes; S4.3: at the beginning of grouting, the grouting pipe is lowered to the hole bottom, the cement slurry is stirred according to the water-cement ratio requirement, the grouting pump is started, the cement slurry is pressed to the hole bottom, and the cement slurry is returned to the orifice until the end; S4.4: hole sealing and flushing: after grouting, the orifice is sealed.

3. The construction method for treating water seepage of a basement floor of a building according to claim 1, characterized in that: The water absorption grouting nozzle (4) in the step S5 is pre-buried to the bottom plate (3) thick 3 / 4, and after the first injection of the hydrophilic polyurethane, it is stopped for 10-15s, and then the second injection of the hydrophilic polyurethane is carried out.

4. The construction method for treating water seepage of a basement floor of a building according to claim 1, characterized in that: The initial plugging grouting nozzle (5) in the step S6 is 10-15cm away from the existing grouting pipe (2), and the initial plugging grouting nozzle (5) is pre-buried to the bottom plate (3) thick 1 / 2 along 45°.

5. The construction method for treating water seepage of a basement floor of a building according to claim 1, characterized in that: The step S7 further comprises the following steps: S7.1: open a 50mm*50mm V-shaped groove (12) at the crack mouth of the bottom plate (3); S7.2: The crack grouting nozzle (6) is embedded at 45° to the crack, and polyurea waterproof coating is poured into the crack grouting nozzle (6); S7.3: After the crack pouring is completed, the part of the crack grouting nozzle (6) protruding from the bottom plate (3) is cut off and ground flat; S7.4: An epoxy repair adhesive is used for sealing, and the sealing range is within 100 mm around the crack grouting nozzle (6).

6. The construction method for treating water seepage of a basement floor of a building according to claim 1, characterized in that: The step S9 further comprises the following steps: S9.1: The opening grouting pipe (11) is arranged along the periphery of the existing grouting pipe (2); S9.2: After the sealing material (9) is pressed and smoothed, the opening grouting pipe (11) is vacuumized; S9.3: After the sealing material (9) is hardened, polyurea waterproof coating is injected into the opening grouting pipe (11).

7. The construction method for treating water seepage of a basement floor of a building according to claim 1, characterized in that: The step S11 further comprises the following steps: S11.1: The new reinforcement (7) is arranged in two directions; S11.2: The new 180° hooked steel bar (8) is arranged; S11.3: The hooked steel bar (8) is arranged in a quincunx shape, one end of the hooked steel bar (8) is embedded in the bottom plate (3), and the other end of the hooked steel bar (8) is tied with the reinforcement (7).

8. The construction method for treating water seepage of a basement floor of a building according to claim 1, characterized in that: The water absorption grouting nozzle (4) is provided with at least two, and the at least two water absorption grouting nozzles (4) are respectively arranged in a ring array along the existing grouting pipe (2).

9. The construction method for treating water seepage of a basement floor of a building according to claim 1, characterized in that: The primary sealing grouting nozzle (5) is provided with at least two, and the at least two primary sealing grouting nozzles (5) are respectively arranged in a ring array along the existing grouting pipe (2).

Images