A construction method for outer waterproof layer of underground structure engineering

Abstract

The present invention relates to the field of building construction technology, and in particular to a method for constructing an external waterproof layer of an underground structure project, including bottom plate waterproof construction, side wall waterproof construction and top plate waterproof construction, wherein the bottom plate waterproof construction and the top plate waterproof construction are constructed by dry paving, and the side wall waterproof construction is constructed by wet paving; the method has the effect of resisting tree root puncture by arranging a root puncture-resistant layer on the top plate, and is suitable for external waterproofing of underground structure projects under green belts. The method can improve the paving quality of waterproof coiled materials and ensure the paving efficiency of waterproof coiled materials; in particular, the side wall waterproof coiled materials are wet-paved, the coiled materials are fully adhered to the polymer cement mortar, the coiled materials are densely paved without hollows and are anti-slip. In addition, the method has simple construction procedures, is easy for on-site workers to understand and operate, and adopts different paving methods for different parts, and has both advantages and disadvantages, thereby ensuring construction quality and improving construction efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a method for constructing an outer waterproof layer of an underground structure engineering. Background Art

[0002] Underground structural projects, such as the outer waterproof layer of the base plate, side wall and top plate of underground structural projects, generally adopt the construction method of laying membranes and applying waterproof coatings.

[0003] The existing "comprehensive pipe gallery bottom plate spray membrane external waterproof construction method" (patent application number: CN202011367968.X) only focuses on the waterproofing treatment of the inner corners of the guide wall and the side wall. The construction process is cumbersome, the operation is inflexible, and the construction speed is slow.

[0004] The known "cross-type integrated pipe corridor external waterproofing construction method" (patent application number CN202011162000.3) only focuses on the waterproofing treatment of the construction joints of the side walls at a certain distance from the bottom plate and the top plate; the construction has great limitations and complicated procedures, which is not conducive to improving the construction speed. The laying of waterproof materials does not solve the control of the laying construction quality in a humid environment and the quality control of the laying of waterproof membranes when the wall base is uneven.

[0005] The above-mentioned prior art construction method of the outer waterproof layer of the underground structure engineering has various inconveniences and problems, which are not desired by those skilled in the art. Summary of the invention

[0006] In view of the above problems, the present invention discloses a method for constructing an external waterproof layer of an underground structure engineering, including bottom plate waterproofing construction, side wall waterproofing construction and top plate waterproofing construction:

[0007] The bottom plate waterproofing construction comprises the following steps:

[0008] Step S11, performing a concrete cushion construction process to form a concrete cushion on the bottom plate;

[0009] Step S12, after applying a layer of base treatment agent on the concrete cushion layer, laying a bottom plate waterproofing membrane on the concrete cushion layer;

[0010] Step S13, forming a bottom plate fine stone concrete protective layer on the bottom plate waterproof membrane;

[0011] The side wall waterproofing construction comprises the following steps:

[0012] Step S21, cleaning the side wall base and determining the paving reference line of the side wall roll material;

[0013] Step S22, applying polymer cement mortar on the side wall base according to the side wall waterproofing coiled material laying reference line, and laying the side wall waterproofing coiled material on the polymer cement mortar;

[0014] Step S23, forming a waterproof mortar protective layer on the side wall waterproof membrane;

[0015] Step S24, laying bricks outside the waterproof mortar protective layer to form a brick protective layer;

[0016] The roof waterproofing construction comprises the following steps:

[0017] Step S31, cleaning the roof base, applying a layer of cold primer on the roof base, and popping up a roof coil paving reference line on the roof base;

[0018] Step S32, laying the roof waterproofing coiled material on the roof base layer according to the roof coiled material laying reference line;

[0019] Step S33, laying a root penetration resistant layer on the top plate waterproofing membrane;

[0020] Step S34, forming a top plate fine stone concrete protective layer on the root penetration resistant layer.

[0021] Preferably, the step S11 specifically includes:

[0022] After measuring and releasing the edge line of the concrete cushion, set the template of the concrete cushion on the bottom plate, and the height of the template of the concrete cushion is the height of the concrete pouring surface; the template of the concrete cushion is made of wooden beams, and the template of the straight section is fixed every 1m, and the template of the curved section is fixed every 0.5m;

[0023] Concrete is poured in the formwork of the concrete cushion layer and vibrated while pouring to form the concrete cushion layer.

[0024] Preferably, the baseboard waterproofing membrane is a double-sided self-adhesive polymer modified asphalt waterproofing layer;

[0025] In step S12, the step of laying the bottom plate waterproofing membrane on the concrete cushion layer specifically includes:

[0026] From one end, the isolation paper of the bottom plate waterproofing roll is peeled off from the back, and two people hold the peeled isolation paper and pull it back evenly to pull out the whole set of isolation paper. At the same time, the part of the bottom plate waterproofing roll with the isolation paper peeled off is pasted on the concrete cushion layer, and after the bottom plate waterproofing roll is laid, the bottom plate waterproofing roll is rolled forward and backward with a rubber roller;

[0027] Among them, the overlapping width of adjacent bottom plate waterproof membranes is greater than or equal to 80mm, and the adjacent bottom plate waterproof membranes are overlapped with adhesive tape, and the bottom plate waterproof membrane is provided with a first reinforcement layer at the corners where the bottom plate and the side wall meet, and the width of the first reinforcement layer is 300-500mm.

[0028] Preferably, in step S22,

[0029] The steps of preparing the polymer cement mortar include:

[0030] The polymer masterbatch and cement are dry-mixed in a mass ratio of 1:10 and then water is added to form a slurry mixture, wherein the water-cement ratio is 0.4;

[0031] The slurry mixture is stirred with an electric stirrer, and after being stirred evenly, it is allowed to stand for 5 to 8 minutes, wherein the stirring time is 1 to 2 minutes.

[0032] Preferably, the side wall waterproofing membrane is a double-sided self-adhesive polymer modified asphalt waterproofing layer;

[0033] In the step S22, the isolation film on the lower surface of the side wall waterproofing membrane is peeled off, and the side wall waterproofing membrane is laid flat on the coated polymer cement mortar, and after one membrane is laid, the next polymer cement mortar is applied, and the next side wall waterproofing membrane is laid, and after laying, the upper surface of the side wall waterproofing membrane is patted and pressed with a trowel or a rubber sheet to make the side wall waterproofing membrane and the mortar fit tightly;

[0034] Among them, the overlapping width of adjacent side wall waterproof membranes is greater than or equal to 80mm, and the side wall waterproof membrane is provided with a second reinforcement layer at the chamfered position where the side wall and the top plate meet, and the width of the second reinforcement layer is 300-500mm.

[0035] Preferably, in step S23, a protective layer of waterproof mortar is applied on the side wall waterproof membrane from bottom to top, and the height applied every day is less than or equal to 1.2 m.

[0036] Preferably, in step S24, bricks are laid from both ends of the side wall toward the middle on the outside of the waterproof mortar protective layer to form a brick protective layer, and the daily laying height is less than or equal to 1 m.

[0037] Preferably, the roof waterproofing membrane is a double-sided self-adhesive polymer modified asphalt waterproofing layer;

[0038] In step S32, the roof waterproofing roll is aligned with the paving reference line of the roof, and the isolation paper of the roof waterproofing roll is peeled off from the back from one end. Two people hold the peeled isolation paper and pull it back evenly to pull out the whole set of isolation paper. At the same time, the roof waterproofing roll with the peeled isolation paper is pasted to the roof base layer, and after the roof waterproofing roll is laid, the bottom plate waterproofing roll is rolled forward and backward with a rubber roller.

[0039] Among them, the overlapping width of adjacent top plate waterproof membranes is greater than or equal to 80mm.

[0040] Preferably, in step S33, adjacent root penetration resistant layers are connected by hot melt welding.

[0041] Preferably, the underground structure project is an underground integrated pipeline gallery, an underground underpass tunnel or an underground ventilation shaft.

[0042] Compared with the prior art, the above invention has the following advantages or beneficial effects:

[0043] 1. The present invention has the function of resisting tree root puncture by arranging a root puncture resistant layer on the top plate, and is suitable for external waterproofing of underground structure engineering under the green belt.

[0044] 2. It can improve the laying quality of waterproof membrane and ensure the laying efficiency of waterproof membrane; especially the wet laying of side wall waterproof membrane, the membrane and polymer cement mortar are fully adhered and tightly attached, the membrane is laid densely without hollows and prevents slipping.

[0045] 3. The construction process is simple, easy for on-site workers to understand and operate, and different paving methods are used in different parts, which have both advantages and disadvantages, ensuring construction quality and improving construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a schematic diagram of the construction structure of the outer waterproof layer of the underground structure engineering in an embodiment of the present invention;

[0047] Among them, 11 is the concrete cushion layer; 12 is the bottom plate fine stone concrete protective layer; 13 is the bottom plate waterproof membrane; 21 is the side wall base layer; 22 is the polymer cement mortar; 23 is the side wall waterproof membrane; 24 is the waterproof mortar protective layer; 25 is the brickwork protective layer; 31 is the top plate base layer; 32 is the cold primer; 33 is the top plate waterproof membrane; 34 is the root penetration resistance layer; 35 is the top plate fine stone concrete protective layer. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] like Figure 1 As shown, the present invention discloses a method for constructing an external waterproof layer of an underground structural project. The construction method can be applied to the external waterproof construction of underground structural projects such as underground comprehensive pipe corridors, underground underpasses, and underground ventilation shafts. This embodiment is described by taking the underground comprehensive pipe corridor as an example; specifically, the construction method includes bottom plate waterproofing construction, side wall waterproofing construction, and top plate waterproofing construction, wherein the bottom plate waterproofing construction and the top plate waterproofing construction are constructed by dry laying, and the side wall waterproofing construction is constructed by wet laying; wherein the advantages of the wet laying method are: low requirements on the base surface, high construction freedom, not affected by weather changes, and can be constructed on a wet base surface, which can greatly shorten the construction period, save costs, and can achieve a full adhesion effect between the roll material and the base surface; the advantages of the dry laying method are: simple construction and high construction efficiency.

[0050] Specifically, in an embodiment of the present invention, the above-mentioned baseboard waterproofing construction includes the following steps:

[0051] Step S11 , performing a concrete cushion construction process to form a concrete cushion 11 on the bottom plate.

[0052] Specifically, the above-mentioned concrete cushion layer is a C20 concrete cushion layer, and the step S11 specifically includes: after measuring and releasing the edge line of the concrete cushion layer, setting a template of the concrete cushion layer on the bottom plate, and the template height of the concrete cushion layer is the height of the concrete pouring surface; wherein, the template of the concrete cushion layer adopts wooden beams, and the straight segment template is fixed every 1m, and the curve change segment template is fixed every 0.5m to prevent the mold from running during the pouring process of the cushion layer concrete; then pouring concrete in the template of the concrete cushion layer, and vibrating while pouring to form a concrete cushion layer 11, and the vibration is carried out using a 50-type vibrating rod with a moving range of 1.5 times the effective radius to ensure the density of the concrete.

[0053] S12, after applying a layer of base treatment agent on the concrete cushion layer 11, a bottom plate waterproofing membrane 13 is laid on the concrete cushion layer 11.

[0054] Specifically, the bottom plate waterproofing membrane 13 is a 4mm thick double-sided self-adhesive polymer modified asphalt waterproofing layer, which is laid in a single layer by the point-bonding method. That is, after the concrete cushion layer 11 reaches the designed strength, the concrete cushion layer 11 is cleaned and dried, and then a layer of base treatment agent is applied, and then the bottom plate waterproofing membrane 13 is laid; and before the bottom plate waterproofing membrane 13 is laid, the laying line of the bottom plate waterproofing membrane 13 is popped up on the concrete cushion layer 11, aligned with the reference line and laid flat on the reference surface, and then the isolation paper is lifted from the back from one end, and two people pull the lifted isolation paper evenly and pull it back, slowly pulling out the whole set of isolation paper, and at the same time, the part of the bottom plate waterproofing membrane 13 lifted by the isolation paper is glued to the concrete cushion layer 11. After the bottom plate waterproofing membrane 13 is laid, it can be rolled forward and backward with a rubber roller at any time to make it firmly bonded to the base surface. The overlapping width of the short sides of adjacent bottom plate waterproofing membranes 13 shall not be less than 80mm (i.e. greater than or equal to 80mm), and the overlapping shall be done with adhesive tape, and the overlapping ends of adjacent bottom plate waterproofing membranes 13 shall be staggered; the overlapping width of the long sides shall not be less than 80mm (i.e. greater than or equal to 80mm), and the overlapping shall be done with adhesive tape. When overlapping adjacent bottom plate waterproofing membranes 13, the oil paper of the lower layer of membrane shall be untied, and the upper layer of membrane shall be laid on it, and the relatively weak places shall be sealed with sealing paste. And the first reinforcement layer of the bottom plate waterproofing membrane 13 shall be prepared in advance at the corners where the bottom plate and the side wall meet. The width of the first reinforcement layer is 300-500mm, and it is made into an arc or a 45° slope angle.

[0055] S13, forming a bottom slab fine stone concrete protective layer 12 on the bottom slab waterproof membrane 13.

[0056] Specifically, the workability of the fine stone concrete is tested when it is delivered to the site, and construction can only be carried out after it meets the requirements. Before pouring the fine stone concrete protective layer 12, a 5 cm high template is set on the bottom plate. The template is made of wooden beams. The template is fixed every 1m in the straight section, and the template is reinforced every 0.5m in the curved section. When pouring, it is evenly spread on the bottom plate waterproof membrane 13, and then spread evenly with a wooden spatula to ensure the thickness of the fine stone concrete protective layer.

[0057] The above-mentioned side wall waterproofing construction includes the following steps:

[0058] Step S21, cleaning the side wall base layer 21 and determining the reference line for laying the coiled material of the side wall.

[0059] Specifically, the surface flatness of the side wall base layer 21 is checked and the surface is cleaned; then the reference line for laying the coiled material of the side wall is determined.

[0060] Step S22 , coating the polymer cement mortar 22 on the side wall base layer 21 according to the side wall waterproofing membrane laying reference line, and laying the side wall waterproofing membrane 23 on the polymer cement mortar 22 .

[0061] Specifically, 32.5R ordinary silica cement is used to prepare the polymer cement mortar 22, and the steps of preparing the above-mentioned polymer cement mortar 22 specifically include: mixing the polymer masterbatch and cement dry in a mass ratio of 1:10 and then adjusting water to form a slurry mixture, wherein the water-cement ratio is 0.4; using an electric stirrer to stir the slurry mixture, and let it stand for 5 to 8 minutes after stirring, wherein the stirring time is 1 to 2 minutes.

[0062] The above step S22 specifically includes: applying polymer cement mortar 22 on the side wall base 21 according to the side wall roll material paving reference line, and determining that the thickness of the polymer cement mortar 22 is 3mm. Here, it should be noted that the range of applying cement mortar within the roll material paving range should not be too large, and the mortar should be applied while paving. The above-mentioned side wall waterproofing membrane 23 is a 4mm thick double-sided self-adhesive polymer modified asphalt waterproof layer. Remove the isolation film on the lower surface of the side wall waterproofing membrane 23, and lay the side wall waterproofing membrane 23 flat on the polymer cement mortar 22 that has just been laid; after the first membrane is laid, apply the polymer cement mortar 22, and lay the second membrane, and so on; use a trowel or rubber sheet to pat and press the upper surface of the membrane, raise the slurry, and exhaust the air on the lower surface of the membrane, so that the membrane and the mortar fit tightly; when overlapping, lift the transparent isolation film at the overlapping part of the lower membrane, and stick the upper membrane flatly on the lower membrane, and the overlapping width of the membrane is not less than 80mm; after the membrane is laid, seal the membrane end, pipe wrapping and other parts with sealing paste. The side wall waterproofing coiled material 23 is provided with a second reinforcement layer with a width of 300-500mm at the chamfered position between the side wall and the top plate, and the second reinforcement layer and the chamfered position are formed into an arc or a 45° chamfer.

[0063] Step S23 , applying 20 mm thick 1:3 waterproof mortar on the side wall waterproof membrane 23 to form a waterproof mortar protective layer 24 .

[0064] Specifically, the waterproof mortar protective layer 24 uses cement mortar with a grade of M7.5. The mortar uses commercial mortar, which is transported to the construction site and tested for workability. It can be used only if it meets the requirements. The waterproof mortar protective layer 24 is applied on the side wall waterproof membrane 23 from the bottom to the top, and the daily application height is less than or equal to 1.2m; wait until the mortar reaches a certain strength before proceeding to prevent the mortar from falling off due to insufficient strength.

[0065] Step S24, laying bricks outside the waterproof mortar protective layer 24 to form a 120 mm thick brick protective layer 25;

[0066] Specifically, the masonry bricks are made of cement with a strength grade of MU5 and a size of 240×115×90. Bricks are laid from both ends of the side wall to the middle outside the waterproof mortar protective layer 24 to form a brick protective layer 25, and the height of the masonry is less than or equal to 1m per day to prevent the masonry from collapsing if the masonry does not reach a certain strength.

[0067] The above-mentioned roof waterproofing construction includes the following steps:

[0068] Step S31 , cleaning the top plate base layer 31 , applying a layer of cold primer 32 on the top plate base layer 31 , and drawing a base line for laying the coiled material of the bottom plate on the top plate base layer 31 .

[0069] Specifically, after the top slab concrete is poured and reaches the designed strength, the dust and debris on the top surface are cleaned, and a layer of cold primer 32 is applied. The cold primer is applied evenly without missing any transition areas, and before the roll material is laid, a base line for laying the roll material of the bottom slab is popped up on the top slab base layer 31.

[0070] Step S32 , laying the roof waterproofing coiled material 33 on the roof base layer 31 according to the roof coiled material laying reference line.

[0071] Specifically, the roof waterproofing roll 33 is a 4mm thick double-sided self-adhesive polymer modified asphalt waterproof layer. In step S32, the roll is laid flat on the reference plane aligned with the roof's roll laying reference line, and the isolation paper of the roof waterproofing roll 33 is lifted from the back from one end. Two people hold the lifted isolation paper and pull it back evenly, slowly pulling out the entire set of isolation paper, and at the same time, the part of the roof waterproofing roll 33 lifted by the isolation paper is glued to the roof base 31. After the roll is laid, it can be rolled forward and backward with a rubber roller at any time to make it firmly bonded to the base surface. The overlap width of the roll is not less than 80mm. The oil paper of the lower roll is untied at the overlapped part, and the upper roll is laid on it; the relatively weak places are sealed with sealing paste.

[0072] Step S33 , laying the root penetration resistant layer 34 on the top plate waterproofing membrane 33 .

[0073] Specifically, before paving, the oil paper on the top surface of the roof waterproofing membrane 33 is peeled off, and then the root puncture resistant layer 34 is paved on the roof waterproofing membrane 33. The paving method of the root puncture resistant layer 34 is the same as that of the roof waterproofing membrane 33; the overlapping parts of adjacent root puncture resistant layers 34 are connected by hot-melt welding.

[0074] Step S34 , forming a top plate fine stone concrete protective layer 35 on the root penetration resistant layer 34 .

[0075] Specifically, after backfilling on both sides of the tunnel is completed, a 70mm thick top plate fine stone concrete protective layer 35 is poured. Before pouring concrete, a 7cm high formwork is set around the top plate. The formwork is made of wooden beams. The formwork is fixed every 1m in the straight section and reinforced every 0.5m in the curved section. During pouring, it is evenly spread on the roll material, and then spread evenly with a wooden trowel to ensure the thickness of the top plate fine stone concrete protective layer 35.

[0076] It should be noted that, in this article, terms such as "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0077] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for constructing an external waterproof layer of an underground structure engineering, characterized in that: Including bottom plate waterproofing construction, side wall waterproofing construction and top plate waterproofing construction: The bottom plate waterproofing construction comprises the following steps: Step S11, performing a concrete cushion construction process to form a concrete cushion on the bottom plate; The step S11 specifically includes: After measuring and releasing the edge line of the concrete cushion, set the template of the concrete cushion on the bottom plate, and the height of the template of the concrete cushion is the height of the concrete pouring surface; the template of the concrete cushion is made of wooden beams, and the template of the straight section is fixed every 1m, and the template of the curved section is fixed every 0.5m; Concrete is poured in the formwork of the concrete cushion layer, and vibrated while pouring to form the concrete cushion layer; Step S12, after applying a layer of base treatment agent on the concrete cushion layer, laying a bottom plate waterproofing membrane on the concrete cushion layer; The bottom plate waterproofing membrane is a double-sided self-adhesive polymer modified asphalt waterproofing layer; In step S12, the step of laying the bottom plate waterproofing membrane on the concrete cushion layer specifically includes: From one end, the isolation paper of the bottom plate waterproofing roll is peeled off from the back, and two people hold the peeled isolation paper and pull it back evenly to pull out the whole set of isolation paper. At the same time, the part of the bottom plate waterproofing roll with the isolation paper peeled off is pasted on the concrete cushion layer, and after the bottom plate waterproofing roll is laid, the bottom plate waterproofing roll is rolled forward and backward with a rubber roller; The overlapping width of adjacent bottom plate waterproofing membranes is greater than or equal to 80mm, and the adjacent bottom plate waterproofing membranes are overlapped with adhesive tapes, and the bottom plate waterproofing membrane is provided with a first reinforcement layer at the corners where the bottom plate and the side wall meet, and the width of the first reinforcement layer is 300-500mm; Step S13, forming a bottom plate fine stone concrete protective layer on the bottom plate waterproof membrane; The side wall waterproofing construction comprises the following steps: Step S21, cleaning the side wall base and determining the paving reference line of the side wall roll material; Step S22, applying polymer cement mortar on the side wall base according to the side wall waterproofing coiled material laying reference line, and laying the side wall waterproofing coiled material on the polymer cement mortar; Step S23, forming a waterproof mortar protective layer on the side wall waterproof membrane; Step S24, laying bricks outside the waterproof mortar protective layer to form a brick protective layer; The roof waterproofing construction comprises the following steps: Step S31, cleaning the roof base, applying a layer of cold primer on the roof base, and popping up a roof coil paving reference line on the roof base; Step S32, laying the roof waterproofing coiled material on the roof base layer according to the roof coiled material laying reference line; Step S33, laying a root penetration resistant layer on the top plate waterproofing membrane; Step S34, forming a top plate fine stone concrete protective layer on the root penetration resistant layer.

2. The method for constructing an outer waterproof layer of an underground structure engineering as claimed in claim 1, characterized in that: In step S22, The steps of preparing the polymer cement mortar include: The polymer masterbatch and cement are dry-mixed in a mass ratio of 1:10 and then water is added to form a slurry mixture, wherein the water-cement ratio is 0.4; The slurry mixture is stirred with an electric stirrer and allowed to stand for 5 to 8 minutes after being stirred evenly, with the stirring time being 1 to 2 minutes.

3. The method for constructing an outer waterproof layer of an underground structure engineering as claimed in claim 1, characterized in that: The side wall waterproofing membrane is a double-sided self-adhesive polymer modified asphalt waterproofing layer; In the step S22, the isolation film on the lower surface of the side wall waterproofing membrane is peeled off, and the side wall waterproofing membrane is laid flat on the coated polymer cement mortar, and after one membrane is laid, the next polymer cement mortar is applied, and the next side wall waterproofing membrane is laid, and after laying, the upper surface of the side wall waterproofing membrane is patted and pressed with a trowel or a rubber sheet to make the side wall waterproofing membrane and the mortar fit tightly; Among them, the overlapping width of adjacent side wall waterproof membranes is greater than or equal to 80mm, and the side wall waterproof membrane is provided with a second reinforcement layer at the chamfered position where the side wall and the top plate meet, and the width of the second reinforcement layer is 300-500mm.

4. The method for constructing an outer waterproof layer of an underground structure engineering as claimed in claim 1, characterized in that: In step S23, a protective layer of waterproof mortar is applied on the side wall waterproof membrane from bottom to top, and the height applied every day is less than or equal to 1.2 m.

5. The method for constructing an outer waterproof layer of an underground structure engineering as claimed in claim 1, characterized in that: In step S24, bricks are laid from both ends of the side wall toward the middle outside the waterproof mortar protective layer to form a brick protective layer, and the daily laying height is less than or equal to 1m.

6. The method for constructing an outer waterproof layer of an underground structure engineering as claimed in claim 1, characterized in that: The roof waterproofing membrane is a double-sided self-adhesive polymer modified asphalt waterproofing layer; In the step S32, the roof sheet waterproofing roll is aligned with the roof sheet laying reference line, and the release paper of the roof sheet waterproofing roll is peeled off from the back side from one end, and two persons pull the peeled release paper back evenly to pull out the whole set of release paper, and at the same time, the part of the roof sheet waterproofing roll with the peeled release paper is pasted to the roof sheet base layer, and after the roof sheet waterproofing roll is laid, the roof sheet waterproofing roll is rolled forward and backward with a rubber roller; Among them, the overlapping width of adjacent top plate waterproof membranes is greater than or equal to 80mm.

7. The method for constructing an outer waterproof layer of an underground structure engineering as claimed in claim 1, characterized in that: In step S33, adjacent root penetration resistant layers are connected by hot-melt welding.

8. The method for constructing an outer waterproof layer of an underground structure engineering as claimed in claim 1, characterized in that: The underground structure project is an underground comprehensive pipeline gallery, an underground underpass tunnel or an underground ventilation shaft.

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