A waterproofing construction method for a floor of an underground structure

Abstract

The application provides a waterproof construction method for a bottom plate of an underground structure, and comprises the following steps: compacting original soil of a foundation to form a foundation of the underground structure; pouring a waterproof cushion layer on the foundation; sequentially performing a steel bar engineering construction and a formwork engineering construction on the waterproof cushion layer; pouring bottom plate waterproof concrete, with a vibration time of 10-30s and layer pouring; and performing maintenance for more than or equal to 14 days after final setting of the waterproof concrete to form the bottom plate of the underground structure. The application adopts two waterproof defenses of a rigid waterproof layer and a concrete structure self-waterproofing which are both water-based mud materials, and the two have good compatibility, thus fundamentally solving quality defects such as water channeling, cold joints, honeycomb and dog holes, reducing concrete cracking, improving concrete strength and impermeable waterproof performance, achieving a quality effect of "one-time construction and lifelong maintenance", and simultaneously reducing project development and construction costs.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building waterproofing, in particular to a waterproof construction method for the bottom plate of an underground structure. BACKGROUND

[0002] At present, with the expansion of construction projects in China, the demand for underground space is increasing. However, due to the special environment of the basement, strict requirements are placed on waterproofing, anti-permeability, and anti-cracking. Leakage problems such as basement floor seepage are common in buildings and are an important issue affecting the use of buildings. Moreover, once the basement leaks, it will result in high maintenance costs and difficulty in maintenance.

[0003] Rigid waterproofing has existed since the founding of the country, but in the early years, due to the incomplete solution of waterproofing and leakage problems caused by process bottlenecks, it has been gradually replaced by flexible waterproofing. In recent years, with the application and popularization of new technologies and new materials, rigid waterproofing technology has been greatly improved. In addition, flexible waterproofing still has problems that cannot be completely solved in underground waterproofing projects. Rigid waterproofing is gradually being accepted by the market due to its low cost, short construction period, and good results.

[0004] The current "rigid-flexible combination" waterproofing process applies a flexible waterproofing layer outside the structure to compensate for the waterproofing defects of the structural concrete. However, in construction, quality problems such as "honeycomb dog holes" and "cold joints" are often ignored, and the flexible waterproofing layer outside the structure is prone to "water channeling" problems. Therefore, there are post-construction leakage problems in buildings. SUMMARY

[0005] To solve the above problems, the present application provides a waterproof construction method for the bottom plate of an underground structure, which uses two waterproofing measures of rigid waterproofing layer and concrete structure self-waterproofing with water-based mud material. The two have good compatibility, which solves the quality defects of "water channeling", "cold joints", and "honeycomb dog holes" from the root, reduces concrete cracking, improves concrete strength and anti-permeability and waterproofing performance, achieves the quality effect of "one-time construction, lifelong maintenance-free", and reduces project development and construction costs.

[0006] The application provides a waterproof construction method for a bottom plate of an underground structure, comprising the following steps: compacting original soil of a foundation to form a foundation of the underground structure; pouring a waterproof cushion layer on the foundation, wherein the thickness of the waterproof cushion layer is not less than 17 mm; the waterproof cushion layer comprises 28 wt% cement, 56 wt% sand, 16 wt% water and 0.15-0.25 wt% of a mortar waterproof agent based on the weight of the cement; sequentially performing steel reinforcement engineering construction and formwork engineering construction on the waterproof cushion layer; pouring waterproof concrete for the bottom plate, wherein the vibrating time is 10-30 s, the pouring is performed in layers, and the overall structure thickness is not less than 250 mm; the waterproof concrete comprises 10 wt% cement, 76.5 wt% sand and stone, 0.3 wt% water reducing agent, 3.3 wt% fly ash, 2.5 wt% slag powder, 7.4 wt% water and 0.15-0.25 wt% of a waterproof densifying agent based on the total weight of the cement and sand and stone; and the waterproof concrete is cured for not less than 14 days after final setting to form the bottom plate of the underground structure.

[0007] Further, the water reducing agent is selected from the combination of one or more of a lignin sulfonate water reducing agent, a naphthalene water reducing agent, a melamine water reducing agent, an aminosulfonate water reducing agent, a fatty acid high water reducing agent and a polycarboxylate water reducing agent.

[0008] Further, the mortar waterproof agent comprises 6-20 wt% sodium dodecyl benzene sulfonate, 1.2-18 wt% oleoyl polypeptide complex, 5-15 wt% silicate, 20-40 wt% calcium hydroxide and 7-67.8 wt% water, and the weight ratio of sodium dodecyl benzene sulfonate to oleoyl polypeptide complex is 1:(0.2-0.9).

[0009] Further, the waterproof densifying agent comprises 3-8 wt% sodium dodecyl benzene sulfonate, 3-10 wt% carboxylic acid surfactant, 5-15 wt% silicate, 20-40 wt% calcium hydroxide and 30-60 wt% water, and the weight ratio of sodium dodecyl benzene sulfonate to oleoyl polypeptide complex is 1:(1-3).

[0010] Further, the oleoyl polypeptide complex is a combination of one or more of N-oleoyl polypeptide, N-oleoyl polysodium amino acid and N-alkanoyl polypeptide, and the silicate is a combination of one or more of sodium silicate, lithium silicate, aluminum silicate and calcium silicate.

[0011] Further, before the waterproof cushion layer construction, the foundation is ensured to be flat, and detailed treatment is performed.

[0012] Further, before the waterproof cushion layer construction, the cement, sand and water are uniformly stirred, and after the mortar waterproof agent is added on the construction site, stirring is performed for not less than 3 min, and then pouring operation is performed.

[0013] Further, in the process of layered pouring waterproof concrete, continuous pouring is adopted, and the pouring of the waterproof concrete of the upper layer is completed before the initial setting of the waterproof concrete of the bottom layer.

[0014] Further, before pouring the waterproof concrete, cement, sand, fly ash, slag powder and water are uniformly stirred, and a water reducing agent is filled in for stirring; after adding the waterproof densifying agent at the construction site, stirring is carried out for greater than or equal to 5 minutes, and pouring operation is carried out.

[0015] Further, in the process of vibrating, the vibrating rod is inserted into the waterproof concrete of the lower layer by 50mm + 10mm for vibrating.

[0016] The waterproof effect of the underground structure floor is realized by adding the additive with the waterproof effect into the mortar and the concrete, and the specific principle is that:

[0017] By adding the mortar waterproof agent in the mortar cushion layer, the silicate in the interior reacts with the hydration product of cement to generate gel containing silicic acid group, the gel as the aggregate component fills and blocks the pores in the concrete in the growth process, thereby cutting off the connection of capillary pipes, reducing the porosity in the interior of the concrete, and improving the compactness and impermeability; the oil acyl polypeptide complex and sodium dodecyl benzene sulfonate are neutralized to the alkali generated by the hydration of cement in the interior under the alkaline condition, long-acting maintain the interior environment of the mortar, and prevent the back-alkaline phenomenon in the interior of the mortar; the oil acyl polypeptide complex and sodium dodecyl benzene sulfonate as the surfactant make the interior fluidity of the mortar good, and reduce the cracking shrinkage; the oil acyl polypeptide complex as the auxiliary surfactant also has the properties of foaming, dispersion and suspension, and adsorption, and is used to improve the uniformity of the waterproof agent, prevent the precipitation of the aggregate component in the interior reaction, and be beneficial to the stability of the performance. The mortar waterproof layer is arranged on the outer side of the concrete, the interior reaction of the concrete is blocked from contacting the air outside, the entry of carbon dioxide in the air is prevented, the service life of the concrete is increased, and the impermeability of the concrete is improved.

[0018] By adding waterproof densifying agent in the concrete, it becomes waterproof concrete, because in the process of concrete construction, the hydration reaction in the concrete will produce "honeycomb dog hole", "cold joint" and other pores, the silicate in the waterproof densifying agent reacts with the hydration product of cement to generate gel containing silicic acid group, the gel as aggregate component will fill and block the pores in the growth process, thereby cutting off the connection of capillary channel, reducing the porosity of the concrete, improving the density and impermeability, and as long as the silicate is not consumed, the gel will be continuously generated, continuously blocking the pores, the silicate can greatly increase the impermeability, and with the growth of time, in the presence of water, the impermeability effect will be better and better, and the penetration depth will be increased; at the same time, the existence of the gel reduces the volume shrinkage and cracking of the concrete in the drying process; the oleoyl polypeptide complex is complexed with sodium dodecyl benzene sulfonate under alkaline conditions to form a complex, neutralize the alkali inside, long-acting maintain the internal environment of the concrete, prevent the occurrence of back alkali; at the same time, a large amount of micro-bubbles are generated, cutting off the capillary channel generated in the hardening process of the concrete, reducing the capillary effect, and improving the impermeability; the oleoyl polypeptide complex helps the extension of the surfactant molecules, significantly reduces the interaction between the surfactant molecules, and improves the effect of the surfactant; sodium dodecyl benzene sulfonate can destroy the electrostatic attraction generated in the concrete system, improve the dispersity of the aggregate component, make it more evenly distributed to the inside of the concrete, and increase the density of the concrete; at the same time, sodium dodecyl benzene sulfonate has strong penetration in water, and can be complexed with Ca 2+ When the complex is replaced by SiO3 2- , etc., to generate crystal or precipitate to block the pores, thereby increasing the impermeability; and the sodium dodecyl benzene sulfonate will not be consumed, thereby having long-acting waterproof performance.

[0019] The present application designs the bottom plate cushion layer in the traditional construction to have waterproof function, reduces the process of smearing a waterproof mortar on the cushion layer in the traditional design, reduces the construction period and cost, realizes double protection with the waterproof mortar, eliminates the water channeling problem between the two waterproof layers, simplifies the construction process, reduces the construction period, and improves the waterproof life.

[0020] It should be understood that the content described in the summary section is not intended to limit the key or important features of the embodiments of the present application, nor to limit the scope of the present application. Other features of the present application will become apparent through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0021] The above and other features, advantages, and aspects of embodiments of the present application will become more apparent by describing in detail the following embodiments with reference to the attached drawings. In the drawings, the same or similar reference numerals refer to the same or similar elements, in which:

[0022] Figure 1 is a waterproof construction process diagram of a basement floor of the embodiment;

[0023] Figure 2 is a waterproof structure schematic diagram of the basement floor of the embodiment.

[0024] wherein, Figures 1-2 the correspondence between the reference signs and the component names in the drawings is as follows:

[0025] 1 foundation; 2 waterproof cushion layer; 3 waterproof concrete. DETAILED DESCRIPTION

[0026] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0027] In addition, the term “and / or” in the present document merely describes an association relationship of associated objects, and can represent three relationships, for example, A and / or B can represent three cases of existence of A alone, existence of A and B simultaneously, and existence of B alone. In addition, the character “ / ” in the present document generally represents an “or” relationship of the front and rear associated objects.

[0028] According to Figure 1 and Figure 2 , the present application provides a waterproof construction method of a basement floor, comprising the following steps:

[0029] S1: compacting the original soil of the foundation to form a foundation of the underground structure;

[0030] The foundation treatment construction is completed according to the design requirements, and a strong bearing layer structure can be formed for the basement floor of subsequent construction;

[0031] S2: pouring a waterproof cushion layer on the foundation, the thickness of the waterproof cushion layer is not less than 17 mm; the waterproof cushion layer comprises 28wt% cement, 56wt% sand, 16wt% water and 0.15-0.25wt% of the weight of the cement of a mortar waterproof agent; the preferred addition amount of the mortar waterproof agent is 0.16wt%, 0.18wt%, 0.2wt%, 0.22wt% and 0.24wt% of the weight of the cement.

[0032] The specific process is: foundation inspection, cleaning, detail treatment, pouring of the waterproof cushion layer, maintenance, waterproof layer inspection after maintenance, and next step construction after acceptance.

[0033] Specifically, before the waterproof cushion construction, it must be accepted by four parties, the base layer should be flat, rough, solid, clean, not peeling, not sanding, not spongy, should be fully moistened, no water, no through joint, no storage separation joint and expansion joint. When the base layer has cracks, pitting, holes or not smooth at the joint, the details need to be pre-processed.

[0034] The mortar of the waterproof cushion uses pre-mixed mortar, which is made by mixing ordinary Portland cement, medium sand and water. In the field mixing, according to the weight ratio of the mortar waterproof agent: water = 1:200, dilute the mortar waterproof agent diluent, according to the need of waterproof performance, add a certain quality of mortar waterproof agent diluent to the cement, add to the inside of the mixed mortar and stir for not less than 3 min, use the waterproof mortar within 2h. In the construction process, if there is mortar segregation phenomenon, secondary mixing should be carried out, if necessary, add cement paste and mortar waterproof agent diluent, do not add water at will, so as to protect the waterproof effect of the mortar waterproof agent. Before pouring the waterproof cushion, control the thickness of the waterproof mortar.

[0035] After pouring the waterproof cushion, use concrete truck pump for pumping operation construction, use flat vibrator for vibrating, use floor sander for secondary surface polishing treatment before the initial setting of the waterproof mortar, to prevent cracks, cover the mulch for maintenance after troweling.

[0036] If unforeseen factors must be left joint during the construction of the waterproof cushion, the joint part should be left with an inclined joint. Before pouring again, remove the loose stones and floating slurry in the inclined joint part and rinse it clean. Use the same batch of waterproof mortar as the bonding layer for subsequent pouring.

[0037] S3: Steel reinforcement engineering construction and formwork engineering construction are carried out on the waterproof cushion in turn; the thickness of the steel reinforcement protection layer is not less than 50mm;

[0038] The use of steel reinforcement increases the internal structure of concrete, so before the construction of waterproof concrete, various steel reinforcements or iron wire binding should be set up, and the formwork should not be touched. In order to ensure the waterproof effect, water stop belt needs to be buried, which can be set by steel plate. When the bolts used to fix the formwork must pass through the waterproof concrete structure, tool type bolts or bolts with plugs can be used, and square water stop rings should be welded on the bolts. After the formwork is removed, waterproof measures should be taken to seal the remaining grooves tightly.

[0039] S4: Pouring waterproof concrete, the vibrating time is 10-30s, pouring by layers, the overall structure thickness is not less than 250mm; the waterproof concrete includes 10wt% cement, 76.5wt% sand and stone, 0.3wt% water reducing agent, 3.3wt% fly ash, 2.5wt% slag powder, 7.4wt% water and 0.15-0.25wt% waterproof densifying agent of the total weight of cement and sand and stone; the preferred addition amount of the waterproof densifying agent is 0.16wt%, 0.18wt%, 0.2wt%, 0.22wt% and 0.24wt% of the total weight of cement and sand and stone.

[0040] When the waterproof concrete is manually mixed, the mixing time should not be less than 5min, and when the waterproof concrete is strongly stirred, the stirring time should not be less than 30s; if the waterproof concrete mixture is segregated after transportation, it must be stirred again, and when the slump loss cannot meet the construction requirements, cement paste with an original water-cement ratio of 0.46 or water reducing agent should be added for stirring, and water should not be directly added.

[0041] When the waterproof concrete is pre-mixed, the pump entry slump should be controlled at 160-180mm, the slump loss value per hour should not be greater than 20mm, and the total slump loss value should not be greater than 40mm.

[0042] The waterproof concrete of the same construction section should be continuously poured, and the previous layer of waterproof concrete should be poured before the bottom waterproof concrete is initially set.

[0043] The waterproof concrete must be vibrated and compacted, and the vibrating time should be 10-30s, so that the waterproof concrete does not overflow and does not bubble, and the vibrating should be avoided to be missed, insufficient and excessive. When the lower layer of concrete is vibrated, the vibrating rod should be inserted into the lower layer by about 50mm. The joint between the two layers is eliminated to ensure the integrity of the concrete structure, and the vibrating should be ended before the next layer of concrete is initially set. The vibrating duration time of each vibrating point should avoid segregation caused by excessive vibration.

[0044] The waterproof concrete should be continuously poured, and the construction joint should be left as little as possible or not left.

[0045] S5: The waterproof concrete is maintained for ≥14 days after the final setting to form the underground structure bottom plate.

[0046] When the waterproof concrete is constructed in winter, the waterproof concrete should meet the following requirements: the temperature of the waterproof concrete entering the mold should not be lower than 10℃; the comprehensive heat storage method, warm shed method and other maintenance methods should be used, and the surface of the concrete should be kept wet to prevent early dehydration of the concrete.

[0047] In the above-mentioned embodiments, when the mass concrete construction is carried out, the 60d strength of the concrete is used as the design strength under the permission of the design; the low-heat or medium-heat cement is used, and the admixtures such as fly ash, slag powder and the like and the additives such as water reducing agent, retarding agent, air entraining agent, pumping agent and the like are used in combination; in the hot season, the measures such as reducing the temperature of the raw materials, reducing the heat absorption of the concrete during transportation and the like are used to reduce the temperature; the pipes can be pre-buried in the concrete to dissipate the heat by the cold water; the heat and moisture preservation is carried out; the difference between the temperature of the center of the concrete and the surface temperature of the concrete should not be greater than 25℃, the difference between the surface temperature of the concrete and the atmospheric temperature should not be greater than 25℃, and the curing time should not be less than 14d.

[0048] In the above-mentioned embodiments, the mortar waterproofing agent comprises 6-20wt% sodium dodecyl benzene sulfonate, 1.2-18wt% oleoyl polypeptide complex, 5-15wt% silicate, 20-40wt% calcium hydroxide and 7-67.8wt% water; and the weight ratio of sodium dodecyl benzene sulfonate to oleoyl polypeptide complex = 1:(0.2-0.9).

[0049] The preparation method of the mortar waterproofing agent comprises the following steps: sodium dodecyl benzene sulfonate is added into water, and stirred and dissolved to form a dissolved solution; the oleoyl polypeptide complex is added into the dissolved solution, and stirred uniformly to form a primary solvent; three-fifths of the calcium hydroxide is added into the primary solvent, and stirred to form an intermediate solvent; the remaining calcium hydroxide is added, and after stirring uniformly, the silicate is added, and stirred to form the waterproofing agent. The mortar waterproofing agent is used according to 0.15-0.25wt% of the total amount of cement in the mortar.

[0050] The mortar waterproofing agent is prepared by using the silicate, sodium dodecyl benzene sulfonate and oleoyl polypeptide complex to interact in the environment of calcium hydroxide, introducing the structures of -COO - , -COONa and -SO3Na to efficiently chelate the Ca 2+ , Al 3+ ions in the cement, and further forming a stable and dense waterproof layer, so as to solve the problems of poor compatibility between the organic polymer and the inorganic cement and easy delamination and fracture, and to give the waterproofing agent the hydrophobic property, and to improve the workability, crack resistance and waterproof performance of the mortar as a whole, and to completely solve the problem of water leakage.

[0051] In the above-mentioned embodiments, the waterproofing and compacting agent comprises 3-8wt% sodium dodecyl benzene sulfonate, 3-10wt% carboxylic acid surfactant, 5-15wt% silicate, 20-40wt% calcium hydroxide and 30-60wt% water; and the weight ratio of sodium dodecyl benzene sulfonate to oleoyl polypeptide complex = 1:(1-3).

[0052] The preparation method of the waterproof densifier comprises the following steps: adding sodium dodecyl benzene sulfonate into water, stirring and dissolving to form a dissolved solution; adding an oleoyl polypeptide complex into the dissolved solution, stirring to form a primary solvent; adding five-thirds of calcium hydroxide into the primary solvent, stirring to form an intermediate solvent; adding the remaining calcium hydroxide, stirring uniformly, then adding a silicate, and stirring to form the waterproof densifier. The waterproof densifier is used according to 0.15-0.25 wt% of the total cement content of the concrete.

[0053] The waterproof densifier uses the silicate, the sodium dodecyl benzene sulfonate, and the oleoyl polypeptide complex to interact in the environment of the calcium hydroxide, introduces the structures of -COO - , -COONa, -SO3Na, and the like to efficiently chelate the Ca 2+ , Al 3+ , and the like ions in the cement, and further forms a stable and dense waterproof layer, thereby solving the problems of poor compatibility between the organic polymer and the inorganic cement and easy delamination and fracture, and simultaneously endowing the waterproof densifier with hydrophobic properties, so that the overall modified cement-based waterproof concrete has the characteristics of good impermeability, low water absorption, waterproofness, and dirt resistance, and further improves the strength and mechanical properties of the concrete.

[0054] In the above embodiment, the water reducing agent is selected from one or more of the following: a lignin sulfonate water reducing agent, a naphthalene water reducing agent, a melamine water reducing agent, an aminosulfonate water reducing agent, a fatty acid high water reducing agent, and a polycarboxylate water reducing agent.

[0055] In the above embodiment, the oleoyl polypeptide complex is one or more of the following: an N-oleoyl polypeptide, an N-oleoyl polypolyamino acid sodium, and an N-alkanoyl polypeptide; and the silicate is one or more of the following: sodium silicate, lithium silicate, aluminum silicate, and calcium silicate.

[0056] In the above embodiment, the material requirements during construction are as follows:

[0057] The testing requirements for mortar waterproofing agents and waterproofing densifiers should comply with the requirements of JC474 "Mortar and Concrete Waterproofing Agents"; ordinary Portland cement or Portland cement with a strength grade of not less than 32.5 MPa should be used, and expired or damp and lumpy cement is strictly prohibited, and cement of different brands or strength grades should not be mixed; the sand used for the mortar waterproofing layer should preferably be medium sand with a mud content of not more than 1% and a sulfide and sulfate content of not more than 1%; the aggregate used for waterproof concrete should be composed of medium sand and gravel, of which medium sand and gravel should be used. The mud content of sand should not exceed 3.0%, and the mud lump content should not exceed 1.0%. Sea sand should not be used. The maximum particle size of gravel should not exceed 40mm. When pumping, the maximum particle size should be 1 / 4 of the conveying pipe diameter. The mud content should not exceed 1.0%, the mud lump content should not exceed 0.5%, and the water absorption rate should not exceed 1.5%. Other requirements for sand and gravel should comply with the provisions of "Standard for Quality and Inspection Methods of Sand and Gravel for Ordinary Concrete" JGJ52-2006. Water should comply with the provisions of "Standard for Water Used in Concrete" JGJ63-2006.

[0058] [Testing the waterproof performance of the base plate]

[0059] The number of waterproof base slab test blocks produced should meet the specifications. The concrete strength grade, impermeability grade, mix proportion, and construction process of the same base slab should be basically the same, and the internal structure should be as follows: Figure 2 As shown, from bottom to top, the layers are: foundation 1, waterproof cushion layer 2, and waterproof concrete 3. Each unit project must have at least two sets of test blocks, with six test blocks in each set; continuous pouring of waterproof concrete should be done every 500m³. 3 Leave a set of impermeability test specimens, less than 500m 3 Sampling shall be conducted at least once, and at least twice for each project. Simultaneously, compressive strength test specimens shall be taken from the same batch of waterproof concrete mixture. The sampling method shall be the same as for ordinary concrete, and the test blocks shall be prepared at the pouring site. Specific performance data are shown in Table 1.

[0060] Table 1. Crack-resistant and waterproof performance data of waterproof concrete and ordinary concrete.

[0061]

[0062] As can be clearly seen from the table above,

[0063] The waterproof concrete is composed of a waterproof cushion layer added with a mortar waterproof agent and a waterproof concrete added with a waterproof densifying agent, compared with the ordinary concrete without the waterproof agent, the waterproof concrete has low early compressive strength, relatively large shrinkage, gradually increased later compressive strength, and obviously smaller shrinkage, and the total shrinkage is smaller than that of the ordinary concrete at the end of 60-day shrinkage period. It can be seen that the shrinkage ratio of the waterproof concrete decreases with the increase of the compressive strength, which is beneficial to control the deformation release of the concrete, the total shrinkage is reduced, the anti-cracking effect is obvious, and the permeable pressure ratio is high, the water absorption is small, and the excellent anti-cracking and anti-seepage effects are achieved.

[0064] From the above conclusion, the application starts from changing the quality of the building structure concrete, and the waterproof densifying agent is added to the concrete in construction, and a chemical reaction occurs with the cement hydration product to generate gel and crystal, fill the small voids of the cement stone, inhibit the penetration of pressure water, improve the fluidity, density and impermeability of the mortar and concrete, and achieve the first rigid self-waterproof purpose of the building structure. In order to ensure that the building does not drip after being put into use, the waterproof mortar containing the mortar waterproof agent is applied on the structure concrete facing water, and the second rigid waterproof construction is realized. The rigid additional waterproof layer is closely combined with the self-waterproof of the concrete structure, and the water channeling problem is completely solved. The two waterproofs reinforce each other, and the zero defect waterproof quality is realized.

[0065] The preferred embodiments of the application are described above, and it should be understood that the preferred embodiments described herein are only used to illustrate and explain the application, and are not used to limit the application.

[0066] In the description of the present application, the terms "connection", "installation", "fixation" and the like should be understood in a broad sense, for example, "connection" can be fixed connection, detachable connection or integral connection, and can be direct connection or indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0067] In the description of the present application, the terms "in the above embodiment", "in some embodiments" and the like mean that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0068] The above merely describes the preferred embodiments of the present application and is not used to limit the present application, and various changes and modifications can be made by those skilled in the art based on the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A waterproofing construction method for a floor of an underground structure, characterized by, The method comprises the following steps: a foundation of original soil is rammed to form a foundation of an underground structure; a waterproof cushion layer is cast on the foundation, the thickness of the waterproof cushion layer is not less than 17 mm; the waterproof cushion layer comprises 28 wt% cement, 56 wt% sand, 16 wt% water and 0.15-0.25 wt% of the weight of the cement of a mortar waterproofing agent; the mortar waterproofing agent comprises 6-20 wt% sodium dodecyl benzene sulfonate, 1.2-18 wt% oleoyl polypeptide complex, 5-15 wt% silicate, 20-40 wt% calcium hydroxide and 7-67.8 wt% water; and the weight ratio of sodium dodecyl benzene sulfonate to oleoyl polypeptide complex = 1:(0.2-0.9); steel reinforcement engineering construction and formwork engineering construction are sequentially performed on the waterproof cushion layer; waterproof concrete is cast, the vibration time is 10-30 s, the waterproof concrete is cast in layers, and the overall structure thickness is not less than 250 mm; the waterproof concrete comprises 10 wt% cement, 76.5 wt% sand and stone, 0.3 wt% water reducing agent, 3.3 wt% fly ash, 2.5 wt% slag powder, 7.4 wt% water and 0.15-0.25 wt% of the total weight of the cement and sand and stone of a waterproof densifying agent; the waterproof densifying agent comprises 3-8 wt% sodium dodecyl benzene sulfonate, 3-10 wt% carboxylic acid surfactant, 5-15 wt% silicate, 20-40 wt% calcium hydroxide and 30-60 wt% water; and the weight ratio of sodium dodecyl benzene sulfonate to oleoyl polypeptide complex = 1:(1-3); the waterproof concrete is maintained for ≥14 days after final setting to form a bottom plate of the underground structure.

2. The construction method according to claim 1, wherein the water reducing agent is selected from one or more of a combination of lignin sulfonate water reducing agents, naphthalene series water reducing agents, melamine series water reducing agents, aminosulfonate series water reducing agents, fatty acid series high water reducing agents and polycarboxylate series water reducing agents.

3. The construction method according to claim 1, wherein the oleoyl polypeptide complex is one or more of a combination of N-oleoyl polypeptide, N-oleoyl polypeptide sodium, N-alkanoyl polypeptide; and the silicate is one or more of a combination of sodium silicate, lithium silicate, aluminum silicate and calcium silicate.

4. The construction method according to claim 1, wherein the foundation is leveled and detailed treatment is performed before the waterproof cushion layer is constructed.

5. The construction method according to claim 1, wherein the cement, sand and water are uniformly stirred before the waterproof cushion layer is constructed, the mortar waterproofing agent is added on the construction site, stirring is performed for ≥3 min, and then the casting operation is performed.

6. The construction method according to claim 1, wherein continuous casting is adopted when the waterproof concrete is cast in layers, and the casting of the waterproof concrete of the upper layer is completed before the initial setting of the waterproof concrete of the bottom layer.

7. The construction method according to claim 1, wherein ​ Before the waterproof concrete is poured, cement, sand, fly ash, slag powder and water are stirred uniformly, and a water reducing agent is filled in for stirring; after the waterproof densifying agent is added at a construction site, stirring is performed for ≥5 min, and pouring operation is performed.

8. The construction method according to claim 1, characterized in that, During the vibrating process, a vibrating rod is inserted into the waterproof concrete of the lower layer at 50 mm±10 mm for vibrating.

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