Basement exterior wall construction method and device

Abstract

The invention discloses a basement exterior wall construction method and device.The method comprises the following steps that the soil surface, attached to a fender post, of the interior of a foundation pit is tamped, and the fender post and the soil surface are cleaned; hanging a net on the surface of the soil and the fender posts; carrying out guniting treatment on the net hanging area; planting steel bars on the fender posts; spraying a waterproof coating, wherein the waterproof coating comprises PB polymer modified asphalt; reinforcing steel bar binding, single-side hoisting mold closing and concrete pouring are carried out; after detecting that the hardness of the concrete meets the standard, demolding and curing. The purposes of reducing construction procedures, reducing labor investment, reducing construction cost and improving construction efficiency can be achieved.

Description

Technical Field

[0001] The present application relates to the technical field of building construction, and in particular to a method and device for constructing a basement exterior wall. Background Art

[0002] The integration of piles and walls refers to the use of foundation pit retaining piles and basement exterior walls together as the basement side wall retaining structure during normal use.

[0003] The existing construction method of later welding of exterior wall reinforcement during the pile-wall integration construction process leads to complex construction procedures and low construction efficiency. Summary of the invention

[0004] The embodiments of the present specification provide a basement exterior wall construction method and device, which are used to solve the problem of low construction efficiency in the prior art.

[0005] The technical solutions provided by the embodiments of this specification are: In a first aspect, an embodiment of the present application provides a basement exterior wall construction method, comprising the following steps: Tamp the soil surface inside the foundation pit on the side where the retaining piles meet, and clean the retaining piles and soil surface; Hang nets on the soil surface and the retaining piles; Carry out spraying treatment on the mesh hanging area; Plant reinforcement on the retaining piles; Spraying waterproof coating, waterproof coating includes PB polymer modified asphalt; Tie steel bars, single-side hoisting and mould closing and concrete pouring; After testing the concrete hardness and meeting the composite standard, the formwork is removed and maintenance is carried out.

[0006] Furthermore, a spraying method is used for spraying treatment; including: Base treatment, chiseling and repairing the holes in the pile body and cleaning the surface of the sandblasted layer, repairing and installing the wire trough and then hanging the net; During the spraying construction, water is sprayed on the pile surface to maintain the wetness, and the spraying pressure is 0.4MPa~1.0MPa. The distance between the spray gun and the structural surface should be 0.6m~1.5m; the angle between the spray gun and the wall should be greater than 30°, and the spraying construction should be carried out from top to bottom or from left to right at a uniform speed.

[0007] Furthermore, the area after the spraying treatment is subjected to brushing treatment, including: After the spraying of the shotcrete slurry but before the initial setting, use a plastic brush to finish and roughen the surface. The mortar surface should be treated to a smooth rough surface, and the roughening depth should be controlled at 1 to 2 mm.

[0008] Furthermore, the spray waterproof coating is evenly sprayed from bottom to top, including: Reinforce the drain holes and apply waterproof coating 2 - 3 times. During the construction of the coating, the principle of uniform brushing and consistent thickness should be followed. After each coating film dries completely, the next spraying is carried out. The dosage of each coating is about 0.5 kg. The nozzle should be 50 - 60 cm away from the spraying surface for vertical spraying. To ensure the uniform spraying of PB - 2 type polymer modified asphalt waterproof coating, the spraying pressure is controlled between 1.4 mpa - 1.5 mpa.

[0009] Furthermore, tying the steel bars includes firmly fixing the customized finished steel mesh with the fixing bars implanted in the retaining piles.

[0010] Furthermore, the concrete pouring is carried out in layers continuously by the conduit method.

[0011] Furthermore, before tying the steel bars, it also includes installing an expansion water stop strip on the foundation surface, including: Clean the debris on the surface of the installation position and ensure the surface is dry. Tear off the release paper outside the water - swelling water stop strip, then directly install the water stop strip on the concrete surface, and add a cement nail every 80 - 120 cm to fix the water stop strip to the concrete to prevent the water stop strip from shifting and expanding outwards. Use a roller to roll the upper surface of the water - swelling rubber water stop strip to make it closely fit with the concrete surface and keep it stable.

[0012] In a second aspect, the embodiments of the present application provide a device for the construction method of the basement exterior wall, including: An outer support, a steel formwork, a concrete pouring layer, implanted steel bars, a PB polymer modified asphalt coating, and a retaining pile arranged in sequence from inside to outside; The support mechanism is used to support the steel formwork; The concrete pouring layer is provided with tied steel bars, and the tied steel bars are fixedly connected with the implanted steel bars; The implanted steel bars are fixedly implanted into the retaining pile.

[0013] Furthermore, the outer support adopts a Y - shaped support structure.

[0014] At least one of the above - mentioned technical solutions adopted in the embodiments of the present application can achieve the following beneficial effects: Adopting the method of later implanting steel bars to anchor the fixing bars has less disturbance to the retaining piles and improves the overall stability. Using PB polymer modified asphalt waterproof coating for spraying construction can not only improve the crack resistance and tensile resistance of the waterproof layer, but also improve the construction convenience. It can achieve the purpose of reducing construction procedures, reducing the labor input, reducing the construction cost, and improving the construction efficiency. Description of the Drawings

[0015] The accompanying drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application. In the drawings: Figure 1 It is a schematic flowchart of the method provided by the embodiments of this specification. Figure 2 It is a schematic side view structure diagram of the device provided by the embodiments of this specification. Figure 3 It is a schematic top view structure diagram of the device provided by the embodiments of this specification. Detailed implementation manners

[0016] To make the objectives, technical solutions, and advantages of the present application clearer, the technical solutions of the present application will be clearly and completely described below in conjunction with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0017] The following will describe in detail the technical solutions provided by each embodiment of the present application in conjunction with the drawings.

[0018] Embodiment 1 Embodiment 1 of this specification provides a construction method for the basement exterior wall. Please refer to Figure 1 as shown, and it includes the following steps: S1. Ram the soil surface on the side of the foundation pit that fits the retaining piles, and clean the retaining piles and the soil surface; In a possible implementation, it should be noted that before the specific construction, the retaining piles have been constructed and passed the acceptance. The soil within the operation area has been cleared and transported out. The basement exterior wall foundation such as the cushion layer, concrete cushion layer, and raft has been constructed and passed the acceptance. Lifting equipment such as tower cranes, vertical concrete transportation equipment, vibrators, etc. have entered the site and passed the acceptance. The site for placing templates and materials has been hardened, leveled, and moderately sloped to prevent water accumulation. The steel molds, steel bars, implanting glue, and PB polymer modified asphalt waterproof coating required for construction have been transported to the site and stacked as required. The placement of steel molds should strictly comply with safety requirements: set up isolation belts in the placement area, strictly prohibit irrelevant personnel from entering, and the self-stabilizing angle of the template placement should meet the requirements (70° - 80°). Check whether the size of the customized template meets the design requirements. S2. Hang a mesh on the soil surface and the retaining piles; S3. Spray mortar on the meshed area; including but not limited to spraying mortar by the spraying method. Level the area after spraying mortar.

[0019] In a possible specific implementation, for the mortar used in shotcreting treatment, qualified products with a grade of 32.5 or above should be used for cement; medium sand with qualified quality should be used for fine aggregate, and the mud content should not exceed 3%; tap water can be used as mixing water. The shotcreting construction equipment includes: platform scale, shotcreting machine with air compressor, electric mixer, sprayer; the platform scale and the pressure gauge of the air compressor must be calibrated and qualified in accordance with relevant national regulations and be within the validity period; the weighing accuracy of the platform scale should be 50g; the pressure gauge should be matched with the air compressor. For the base treatment, before shotcreting construction, the base surface of the pile body should be treated, and the sundries attached to the surface of the pile body should be cleaned to enable the shotcrete layer to effectively and firmly adhere to the concrete base surface. The parts with bulging formwork and shrinkage holes on the surface of the pile body should be chiseled flat and cleaned in advance, the installation wire groove should be repaired, and the mesh cloth should be nailed and hung before shotcreting. To ensure the effective and firm adhesion of the cement mortar to the concrete base surface, the holes on the base surface should also be repaired with the same cement mortar as the shotcrete material, and the concrete base surface should be fully wetted by spraying water. After the base treatment is completed, a construction platform should be erected. For working surfaces with a height exceeding 2 meters, fixed or mobile scaffolds should be used. The scaffold should be equipped with upper and lower ladders and essential safety devices such as safety guards. And safety belts should be worn throughout the operation process. Before spraying, the base should be clean, free of oil stains, and the holes should be repaired according to the aforementioned method. Construction can only be carried out after passing the acceptance. Before shotcreting construction, the pile body should be appropriately watered and wetted in advance according to the actual situation to ensure the effective and firm adhesion of the mortar. When the wind force is level 4 or above, shotcreting construction shall not be carried out. Shotcreting construction is strictly prohibited in moderate to heavy rain weather. During shotcreting construction, the spraying pressure should preferably be 0.4 MPa to 1.0 MPa. The distance between the spray gun and the structural surface should preferably be 0.6 m to 1.5 m; the angle between the spray gun and the wall should be greater than 30°, and the spraying construction should be carried out by moving uniformly from top to bottom or from left to right. Before formal shotcreting, on-site trial spraying should be carried out, and the trial spraying area should not be less than 10 m². After determining the pressure of the air compressor (shotcreting machine) and the distance between the spray gun and the working surface, the formal shotcreting operation can be carried out. Large-area spraying can only be started after passing the acceptance by the supervisor and the owner. During spraying, the slurry should be evenly covered on the base in the form of dots and meshes, and the height of the formed shotcrete points should be 1 to 3 mm, and the bottom diameter of the dots should be 2 to 5 mm. The spraying should be uniform, and the unevenly sprayed parts should be treated by secondary spraying. Before the initial setting of the shotcrete slurry, a plastic brush should be used for finishing and roughening treatment, and the mortar surface should be treated as a flat rough surface (increasing the friction force to improve the anti-slip performance). After the initial setting of the shotcrete slurry, spray curing should be adopted, and the spraying degree should keep the wall completely wet. Starting from the second day, water spraying curing should be adopted, 2 to 3 times per day. In dry, hot and windy seasons, 1 to 2 additional water sprayings should be added, and the water spraying curing should not be less than 3 days.

[0020] The area after shotcreting treatment should be leveled by brushing. Before the initial setting of the shotcrete slurry, a plastic brush should be used for finishing and roughening treatment, and the mortar surface should be treated as a flat rough surface (increasing the friction force to improve the anti-slip performance), and the roughening depth should be controlled at 1 to 2 mm.

[0021] During the roughening process, the force applied to the plastic brush should be uniform to ensure that the hair depth and hair width are uniform during the pulling process. After the roughened concrete solidifies, the surface scum needs to be removed, otherwise it will affect the bonding strength of the new concrete. Control the roughening time well. If it is too early, there will be serious slurry carrying, affecting the flatness. If it is too late, the roughening depth will be insufficient. The roughening is carried out along the transverse direction of the bridge and shall not stop during one operation. The appearance of the roughening should have smooth texture.

[0022] S4. Carry out rebar planting on the retaining piles; In a possible implementation, tying the steel bars includes firmly fixing the customized finished steel bar mesh with the fixed bars implanted in the retaining piles.

[0023] Specifically, the diameter and depth of the drilled hole shall meet the requirements. The allowable deviation of the depth is +20, -5 mm, and the allowable deviation of the perpendicularity is 5°. The drilled hole shall avoid the stressed steel bars. For the waste holes, chemical anchoring glue or high-strength resin cement mortar shall be used to fill them solidly. Use an air compressor or a manual air pump to thoroughly blow out the debris and dust in the hole, then wipe the hole with acetone and keep the hole dry. Inject the adhesive into the hole, and the quantity of the glue shall meet the anchoring requirements. Insert the steel bar into the hole, make a temporary fixation, and carry out curing maintenance according to the curing conditions provided by the manufacturer. During the curing period, disturbance is prohibited. Insert the steel bar into the hole, make a temporary fixation, and carry out curing maintenance according to the curing conditions provided by the manufacturer. During the curing period, disturbance is prohibited. When the newly planted steel bar overlaps with the original steel bar, the lap length l of the tension steel bar shall be based on the percentage of the lap joint area of the steel bars within the same connection area. The net spacing between the newly planted steel bar and the original steel bar at the lap joint shall not be greater than 6d. When the net spacing exceeds 4d, the lap length shall be increased by 2d. When planting steel bars, the steel bars shall preferably be welded first and then planted; if it is difficult and welding must be done later, the distance between the welding point and the surface of the base concrete shall be >20d and >200 mm, and the root of the planted steel bar shall be wrapped with a towel soaked in ice water. Before the construction of planting steel bars, on-site pull-out tests shall be carried out on the used steel bars and the planting glue to determine whether the steel bars and the planting glue meet the design requirements. The method is: make concrete specimens with the same strength grade as the concrete component where the steel bars are to be planted, implant 3 groups of steel bars according to the steps of planting steel bars, and carry out pull-out tests after the planting glue is completely cured. Use a special steel bar dynamometer for the test. When the applied force reaches the yield strength of grade II steel bars (450 N / mm2), necking phenomenon appears and then it breaks. When testing, the force applied by the dynamometer to the fixture shall meet FC≥FYK (FC: the force applied by the dynamometer, N / mm2; FYK: the yield strength of the steel bar, N / mm2). The test proves that the strength of the planting glue for planting steel bars is greater than the yield strength of the steel bars, and the failure of the planted steel bars is the yield failure of the steel bars, not the bonding failure of the glue, which indicates that both the steel bars and the planting glue are qualified. After planting steel bars, non-destructive pull-out tests shall be carried out to detect the quality of the planted steel bars in the working state, and the number of tests is 10% of the total number of planted steel bars. During the test, the force applied by the dynamometer shall be less than the yield strength of the steel bars and greater than the designed anchoring force value of the planted steel bars provided by the design department. After the test is qualified, the next process can be carried out.

[0024] Reinforcement mesh processing: All reinforcement mesh processing must be completed in the designated steel processing shed to ensure uniform processing conditions. First, use a steel bar straightening machine to straighten the steel bars, and then cut them into steel bars. The mesh size is 20cm×20cm. Considering the arch spacing and the lap length between meshes, the size of the reinforcement mesh is generally 1.2m×1.5m. The longitudinal and transverse steel bars should be spot welded. Pay attention not to burn the steel bars during welding. The reinforcement mesh should be flat, there should be no scars on the steel bar surface, and the cross-section of the steel bar should be weakened. The formed wire mesh must be lifted and placed gently to prevent falling and deformation. The finished wire mesh should be kept away from the processing site, stacked in the designated finished product stacking site, and covered. The height of the padding under the original and finished steel bars should not be less than 30cm. During storage and transportation, a humid environment should be avoided to prevent corrosion, pollution, and deformation. Hang the mesh, and the processed wire mesh should be hung at the position marked on the drawing. The wire mesh should be laid along with the undulation of the initial sprayed surface, tied and fixed to the system bolts or longitudinal connecting steel bars constructed earlier, and then welded between the wire meshes. The overlapping length of the meshes should be 1-2 meshes.

[0025] Key points for construction control: The size of the reinforcement mesh should meet the design requirements; the laying of the reinforcement mesh should be carried out as follows: lay the reinforcement mesh after spraying the waterproof material on the working surface, and the thickness of the protective concrete layer should not be less than 2cm; the reinforcement mesh should be laid along with the undulation of the initial sprayed surface, and the gap between the reinforcement mesh and the sprayed surface is generally not more than 3cm, and it should be firmly connected to the bolts or other fixing devices. Key points for processing: Before welding the steel bars, the parts such as oil stains, paint, cement slurry, floating skin, and rust that are peeled off by hammering on the steel bar surface should be cleaned. The processed reinforcement mesh should be flat to ensure that there are no scars on the steel bar surface.

[0026] S5. Spray waterproof coating, and the waterproof coating includes PB polymer modified asphalt; the spraying method includes but is not limited to spraying the waterproof material in a uniform spraying method from bottom to top. After spraying, install an expansion water stop strip on the foundation surface. The spraying thickness is at least 3mm.

[0027] In a possible implementation, the high polymer modified asphalt bridge deck waterproof coating is mainly made of a large dose of composite polymer as the main material, with a small amount of high-quality petroleum asphalt, and made into a new type of composite waterproof coating. This coating not only has the excellent elasticity, plasticity, heat resistance and adhesion of polymer, but also has good affinity with concrete products. Since the product is a single-component water-based coating, it does not need to be heated during use, does not produce harmful volatile gases, is harmless to the human body, does not pollute the environment, and belongs to an environmentally friendly product. This waterproof coating is easy to construct, easy to repair, has a low viscosity, can be sprayed or brushed; the construction speed is fast and the labor intensity is low. The material has excellent performance, large elongation and good crack resistance after film formation, does not flow at high temperature, does not become brittle at low temperature, and has good temperature change resistance. After the layer is cleaned, the parts such as internal and external corners, expansion joints, and construction joints should be treated. In particular, parts that are not easy to paint, such as drain holes, should be strengthened and painted with waterproof coating 2 - 3 times. The coating construction should follow the principle of uniform brushing and consistent thickness, achieving "thin, even, and uniform". After each coating film is completely dry, the next spraying can be carried out. The interval time for each time is about 2 - 5 hours. The amount of each coating is about 0.5 kg. When spraying PB polymer waterproof coating, it should be constructed with the wind. The nozzle should be 50 - 60 cm away from the spraying surface for vertical spraying. To ensure the uniform spraying of PB - 2 type polymer modified asphalt waterproof coating, the spraying pressure should be controlled between 1.4 mpa - 1.5 mpa, and its height can also be adjusted appropriately according to the wind direction. To avoid the pollution of the crash barrier by PB - 2 type waterproof coating, when spraying PB - 2 type polymer modified asphalt waterproof coating, the crash barrier should be blocked. Generally, the root of the crash barrier can be painted manually. The waterproof layer of PB - 2 type waterproof coating can be painted or sprayed multiple times according to the project grade and thickness requirements until the standard requirements are met. After the concrete is poured, the watering curing method should be adopted and covered with non - woven fabric to keep the inside of the concrete moist and maintain its temperature, preventing sun exposure. The curing time interval depends on the air temperature, and the concrete must be kept in a wet state. The curing water should be the water used for concrete mixing to ensure the cleanliness of the concrete. When the maintenance personnel are maintaining, the water should be evenly poured and not allowed to flow freely at a fixed place.

[0028] S6. Binding steel bars, single - side hoisting and closing the formwork, and concrete pouring; Binding steel bars includes firmly fixing the customized finished steel bar mesh with the fixed bars implanted in the retaining piles. The concrete pouring adopts the conduit method for layered continuous pouring.

[0029] In a possible implementation, after the external wall formwork is closed, concrete should be poured in time. The conduit should be inserted to a height of 300 - 500 mm from the bottom elevation. Check the installation length of the conduit and make records. Record should be filled for each truck of concrete. The depth of the conduit inserted into the concrete should be maintained at 0.5 - 1 m. The concrete storage capacity of the conduit aggregate hopper should ensure the initial pouring volume. Generally, each conduit should be prepared with 1 truck of 6 - cubic - meter concrete volume to ensure that the pipe - burying depth is not less than 500 mm when starting to pour concrete. To ensure the fluidity of the concrete in the conduit, it should rise evenly and be continuously poured. The pouring rising speed should not be less than 2 m / h. In case of interruption of pouring, the time should not exceed 30 minutes. The height difference of the concrete surface between two conduits should not be greater than 50 cm. The horizontal layout distance between conduits is generally 2.5 m, the maximum is not greater than 3 m, and the distance from the formwork end should not be greater than 1.5 m.

[0030] S7. After the concrete hardness is detected to meet the standard, the formwork is removed for curing.

[0031] In this embodiment, the steel bars implanted in the retaining piles are used to bind and fix the steel bars of the basement exterior wall, which has the characteristics of convenient construction, strong anchoring force and easy quality control. The construction method of using sprayed PB polymer modified asphalt waterproof coating as the waterproof layer of the basement exterior wall has the characteristics of fast construction, strong weather resistance, anti-aging and good anti-seepage effect. This process uses the method of pouring concrete with a fixed steel formwork supported unilaterally, which has the characteristics of convenient installation and disassembly, fast formwork support speed, time-saving and labor-saving, etc.

[0032] Furthermore, it should be noted that the formwork at the internal and external corners is preferably designed as an integral part with the large planar steel formwork, and the corner length should be greater than 30 cm. To prevent the deformation of the formwork at the internal and external corners, triangular steel supports should be designed on the back of the internal corner formwork, while the external corner formwork should be designed with additional external supports. When designing the support positions and fixing methods, the positions of the planar supports and the internal and external corner supports should be considered according to the shape of the formwork, the size of the formwork and the stiffness of the formwork body. The material of the support should have sufficient stiffness and adjustable length. The support positions should ensure the stability of the formwork system, and at least two supports should be set for each formwork. To prevent the cross-collision of the external supports of the internal corner formwork, the external supports are preferably designed in a Y shape.

[0033] Further preferably, before binding the steel bars, it also includes installing an expansion waterstop strip on the foundation surface. Specifically, for the parts where the waterstop strip needs to be installed, the concrete surface should be chiseled flat first; then, use a wire brush, putty knife and brush to clean the hardened concrete surface of the construction joint, and thoroughly clean the cement slurry, debris and dust to ensure the surface is dry; when installing the water-swelling waterstop strip, the following steps should be followed for construction: first, tear off the release paper outside the water-swelling waterstop strip, and then directly install the waterstop strip on the concrete surface, and add a cement nail every 80 - 120 cm to fix the waterstop strip to the concrete to prevent the waterstop strip from being displaced and expanding outwards; use a roller to roll the upper surface of the water-swelling rubber waterstop strip to make it closely fit with the concrete surface and keep it stable; when two waterstop strips need to be connected, cut the ends of the two waterstop strips to be lapped into a bevel or flattened by 1 / 2 within a range of 6 cm respectively, then overlap and lap them up and down, and press and condense them by hand to make them closely contact the concrete surface. Then fix them with cement nails in the middle of the lap, staggering more than 6 cm, and no gap should be left. The waterstop strip is strictly prohibited from being butt-jointed to avoid the risk of water leakage caused by dislocation damage during concrete pouring.

[0034] Finished product protection: After the construction of the waterstop strip is completed, the concrete pouring of the next process should be carried out in a timely manner. If there is an objective reason that requires a long time interval before the concrete pouring can be carried out, it should be covered with protective materials in a timely manner to prevent pollution, long-term sunlight exposure, and avoid the influence of rain and waterlogging.

[0035] During the construction of the exterior wall of the basement, the following points should be noted for the installation technology of the water-swellable waterstop strip: The waterstop strips for vertical construction joints and bottom construction joints need to be installed after the concrete is chiseled and before the steel bars are tied; the waterstop strip for the top construction joint of the wall needs to be installed after the formwork of the top slab is erected and before the slab steel bars are tied. The specific construction process flow is as follows: First, chisel the construction joint, then perform the plaster cleaning work, then place the waterstop strip, brush a layer of cement slurry, and carry out the steel nail shooting operation. Finally, conduct the acceptance inspection and then carry out the steel bar tying work.

[0036] Embodiment 2 Embodiment 2 of this specification provides a device for the construction method of the exterior wall of the basement. Please refer to Figure 2 and Figure 3 as shown, including: An outer support 7, a steel formwork 6, a concrete pouring layer 5, implanted steel bars 3, a PB polymer modified asphalt coating 2, and a retaining pile 1 arranged in sequence from the inside to the outside; The support mechanism is used to support the steel formwork; Binding steel bars 4 are arranged in the concrete pouring layer, and the binding steel bars are fixedly connected to the implanted steel bars; The implanted steel bars are fixedly implanted into the retaining pile.

[0037] Furthermore, the outer support adopts a Y support structure.

[0038] It should also be noted that the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such a process, method, commodity or device. Without further limitations, the element defined by the statement "including one..." does not exclude the existence of other identical elements in the process, method, commodity or device including the said element.

[0039] The above are only the embodiments of this application and are not used to limit this application. For those skilled in the art, this application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the scope of the claims of this application.

Claims

1. A basement exterior wall construction method, characterized in that: The following steps are involved: Tamp the soil surface inside the foundation pit on the side where the retaining piles meet, and clean the retaining piles and soil surface; Hang nets on the soil surface and the retaining piles; Carry out spraying treatment on the mesh hanging area; Plant reinforcement on the retaining piles; Spraying waterproof coating, waterproof coating includes PB polymer modified asphalt; Tie steel bars, single-side hoisting and mould closing and concrete pouring; After testing the concrete hardness and meeting the composite standard, the formwork is removed and maintenance is carried out.

2. A basement exterior wall construction method according to claim 1, characterized in that: The spraying treatment is carried out by the spraying method; including: Base treatment, chiseling and repairing the holes in the pile body and cleaning the surface of the sandblasted layer, repairing and installing the wire trough and then hanging the net; During the spraying construction, water is sprayed on the pile surface to maintain wetness, and the spraying pressure is 0.4MPa~1.0MPa; The distance between the spray gun and the structural surface should be 0.6m~1.5m; the angle between the spray gun and the wall should be greater than 30°, and the spraying construction should be carried out by moving at a uniform speed from top to bottom or from left to right.

3. A basement exterior wall construction method according to claim 1, characterized in that: The area after the spraying treatment is brushed and leveled, including: After the spraying of the shotcrete slurry but before the initial setting, use a plastic brush to finish and roughen the surface. The mortar surface should be treated to a smooth rough surface, and the roughening depth should be controlled at 1 to 2 mm.

4. A basement exterior wall construction method according to claim 1, characterized in that: The spray waterproof coating is evenly sprayed from bottom to top, including: Strengthen the drainage holes and apply 2-3 coats of waterproof coating; The paint application should follow the principle of uniform brushing and consistent thickness. Each time the coating film is completely dry, the next coat of spraying should be carried out. The amount of paint used for each coat is about 0.5kg. The nozzle should be sprayed vertically 50-60cm away from the spraying surface. To ensure uniform spraying of PB-2 polymer modified asphalt waterproof coating, the spraying pressure should be controlled between 1.4 MPa and 1.5 MPa.

5. A basement exterior wall construction method according to claim 1, characterized in that: Rebar tying involves securing the custom-made finished steel mesh with fixing bars embedded in the retaining piles.

6. A basement exterior wall construction method according to claim 1, characterized in that: Concrete pouring is carried out in layers continuously using the conduit method.

7. A basement exterior wall construction method according to claim 1, characterized in that: Before tying the steel bars, the expansion water stop strips are also installed on the foundation surface, including: Clean the debris on the surface of the installation location and ensure that the surface is dry; Tear off the isolation paper on the outside of the water-swelling waterstop strip, then install the waterstop strip directly on the concrete surface, and add a cement nail every 80 to 120 cm to fix the waterstop strip to the concrete to prevent the waterstop strip from being dislocated and expanding outwards; Use a roller to roll the upper surface of the water-swelling rubber waterstop strip to make it fit tightly against the concrete surface and remain firm.

8. A device for a basement exterior wall construction method, characterized in that: include: From inside to outside, the external support, steel formwork, concrete pouring layer, embedded reinforcement, PB polymer modified asphalt coating and retaining piles are arranged in sequence; The supporting mechanism is used to support the steel mold; The concrete pouring layer is provided with binding steel bars, and the binding steel bars are fixedly connected to the embedded steel bars; The embedded reinforcement is fixedly implanted in the retaining pile.

9. The device for the basement exterior wall construction method according to claim 8, characterized in that: The outer support adopts a Y support structure.

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