Water pipe well construction method

Abstract

The invention provides a water pipe well construction method, and belongs to the technical field of water pipe well construction.The water pipe well construction method comprises the following steps that a prefabricated pipe well bottom mold is deeply designed, and through holes and non-through holes are designed; the prefabricated pipe well bottom mold is made of GRC materials, reinforcing meshes are arranged in the prefabricated pipe well bottom mold, and reinforcing steel bars are additionally arranged on the four sides to reinforce and extend out of the plate face. Prefabricated barrier strips are made of GRC materials; concrete lifting lugs are additionally arranged on frame beams on the periphery of the tube well; the prefabricated pipe well bottom mold is hoisted to a designated pipe well hole, two plummets are adopted for positioning at the same time, and the prefabricated plate is manually tilted to adjust laser points in two holes to the circle center; the prefabricated blocking strips are bonded to the periphery of the prefabricated pipe well bottom mold; paving a thin film for concrete curing on the surface of the prefabricated slab, and pouring structural layer concrete; mounting a vertical tube of the tube well, and placing a steel sleeve on the reserved hole of the prefabricated slab; micro-expansive fine aggregate concrete is adopted for secondary pouring of tube well structural slab concrete, and a secondary calendaring process is adopted for the surface.

Description

Technical Field

[0001] The invention belongs to the technical field of water pipe well construction, and in particular relates to a water pipe well construction method. Background Art

[0002] The water pipe well is an indispensable and important part of modern buildings. It undertakes the vertical transportation function of various pipelines such as water supply and drainage, fire protection, and heating. With the continuous expansion of building scale and the increasing complexity of functions, the design and construction of water pipe wells are facing more and more challenges. The traditional water pipe well construction method mainly adopts cast-in-place concrete technology. Although this method is widely used, it has many problems. First, the construction period of cast-in-place concrete is long, and it requires multiple steps such as on-site formwork, steel bar tying, concrete pouring, and maintenance, which seriously affects the construction progress. Secondly, the quality of on-site construction is difficult to control, and defects such as honeycombs, pits, and holes are prone to occur, which affects the waterproof performance and service life of the water pipe well. Furthermore, the traditional method has high requirements for the construction environment and is greatly affected by the weather. When constructing in cold or hot seasons, the quality of concrete is more difficult to guarantee. In addition, on-site construction generates a lot of noise, dust and construction waste, which causes serious pollution to the surrounding environment. In terms of pipe well bottom treatment, the common practice is to use post-casting belt technology, but this method has many shortcomings. Cold joints are easily formed in the post-cast strips, affecting the integrity of the structure; waterproofing is difficult and leakage is prone to occur; and the construction of the post-cast strips requires a special formwork system, which increases the project cost and construction difficulty.

[0003] In recent years, prefabricated assembly technology has been widely used in the construction field, but its application in water pipe well construction is not mature enough. At present, there are some prefabricated pipe well bottom mold products on the market, but the following problems are common: poor material performance, compressive strength and impermeability are difficult to meet the requirements; the connection method with the cast-in-place structure is not reliable enough, and cracks and leakage are prone to occur; the positioning accuracy of prefabricated parts is difficult to guarantee, which affects the accuracy of pipeline installation; improper connection between prefabricated parts and risers can easily become a weak link for leakage. Therefore, there is an urgent need for a new water pipe well construction method that can give full play to the advantages of prefabricated assembly technology, solve various problems existing in the existing technology, improve construction efficiency and quality, reduce costs, and realize fast, efficient and environmentally friendly water pipe well construction. Summary of the invention

[0004] In view of this, the present invention provides a water pipe well construction method, which solves the drawbacks of long construction period and complicated operation of cast-in-place concrete, improves construction efficiency and quality, and reduces costs.

[0005] The present invention is achieved in that:

[0006] The present invention provides a water pipe well construction method, which comprises the following steps:

[0007] S10. Conduct in-depth design of the prefabricated pipe well bottom mold, and design through holes and non-through holes;

[0008] S20, using GRC material to make the prefabricated pipe well bottom mold, with a steel mesh inside, and additional steel bars on the four sides to strengthen and extend out of the plate surface;

[0009] S30, use GRC material to make prefabricated stop bars, with steel bars inside and grooves on the top;

[0010] S40, adding concrete ears on the frame beams around the pipe well, and the length of the prefabricated pipe well bottom mold entering the ears is 6 cm when the size is designed;

[0011] S50, hoisting the prefabricated pipe well bottom mold to the designated pipe well opening, using two plumb lines to position it simultaneously, and manually tilting the prefabricated plate to adjust the laser points in the two holes to the center of the circle;

[0012] S60, using epoxy resin glue or marble glue to bond the prefabricated stop strips around the prefabricated pipe well bottom mold;

[0013] S70, laying a concrete curing film on the precast slab surface and pouring structural layer concrete;

[0014] S80, install the pipe well riser, make and weld the water stop ring on the steel casing, and place the steel casing on the reserved hole of the prefabricated plate;

[0015] S90, use micro-expansion fine stone concrete for secondary pouring of pipe well structure slab concrete, and use secondary calendering process on the surface;

[0016] The GRC material is optimized by using a multi-objective optimization model, and the specific steps include:

[0017] S21, obtaining experimental data, including physical properties of the prefabricated pipe well bottom mold made of GRC materials with various ratios and each ratio and steel mesh, including compressive strength, flexural strength, impermeability and shrinkage; the ratio is specifically the ratio of cement, sand, glass fiber, fly ash and admixture;

[0018] S22, establishing a mapping relationship between the proportion of each component in the GRC material and each physical property, wherein the mapping relationship is a combination of a linear relationship, a power relationship, a reciprocal relationship, and a logarithmic relationship;

[0019] S23, according to the mapping relationship, establish a relationship model equation group of each physical property and the ratio, including a compressive strength equation, a flexural strength equation, an anti-permeability performance equation and a shrinkage rate equation;

[0020] S24, fitting the relationship model equation group using the experimental data to obtain a fitting equation group;

[0021] S25, establishing a multi-objective optimization model according to the fitting equation group, and determining the constraint conditions of the multi-objective optimization model;

[0022] S26, solving the multi-objective optimization model to obtain 10 non-inferior solutions;

[0023] S27. Conduct a small-scale experiment on each non-inferior solution, and select the ratio with the best physical properties of the prefabricated pipe well bottom mold made with the steel mesh as the final ratio of the GRC material.

[0024] The relationship model equation group is specifically expressed as follows:

[0025] 1. Compressive strength equation:

[0026]

[0027] 2. Flexural strength equation:

[0028]

[0029] 3. Anti-seepage performance equation:

[0030]

[0031] 4. Shrinkage equation:

[0032]

[0033] Among them, f c ,f f ,f p ,f s Respectively represent compressive strength, flexural strength, impermeability and shrinkage rate; x1, x2, x3, x4, x5 have the same meaning as above; a k0 ,a ki ,b ki ,c ki ,d ki ,e kij (k=c,f,p,s) is the coefficient to be determined; ε k (k=c,f,p,s) is the error term of each equation.

[0034] Parameter acquisition method:

[0035] 1. x1, x2, x3, x4, x5 are obtained through ratio design, ranging from 0 to 1, and satisfy

[0036] 2.f c ,f f ,f p ,f sObtained through experiments, the specific steps are as follows:

[0037] Step 1: Prepare GRC specimens according to the designed mix ratio;

[0038] Step 2: Perform physical property test after 28 days of curing;

[0039] Step 3: Compressive strength and flexural strength are tested according to GB / T 17671-1999;

[0040] Step 4: The anti-seepage performance is tested according to GB / T 50082-2009;

[0041] Step 5: The shrinkage rate is tested according to JC / T 603-2004.

[0042] 3. Undetermined coefficient a k0 ,a ki ,b ki ,c ki ,d ki ,e kij (k=c,f,p,s) is obtained by least squares fitting, the specific steps are as follows:

[0043] Step 1: Construct the objective function Where M is the number of test groups, f km is the measured value, is the predicted value;

[0044] Step 2: Solve

[0045] Step 3: Solve the above system of equations to obtain the values ​​of the unknown coefficients.

[0046] 4. Error term ε k (k=c,f,p,s)Assume that it follows a normal distribution in The residual analysis is used to estimate:

[0047]

[0048] Where p is the number of undetermined coefficients in the model.

[0049] The constraints of the multi-objective optimization model are specifically the reasonable range of compressive strength, flexural strength, impermeability and shrinkage rate, which are determined based on engineering experience.

[0050] On the basis of the above technical solution, a water pipe well construction method of the present invention can also be improved as follows:

[0051] Wherein, the step S10 specifically includes the following steps:

[0052] Step 101, analyzing the distribution pattern of the risers in each manhole, comparing the changes in the positions of the risers on different floors, and determining the positions of the full-length risers;

[0053] Step 102, designing the positions of the full-length risers as through holes, and designing the positions of the other risers as non-through holes;

[0054] Step 103, establishing a universal plate model for each tube well, including through holes and non-through holes;

[0055] Step 104, design the prefabricated well bottom template to be 3 cm thick and determine to use GRC material;

[0056] Step 105, calculate the required compressive strength of the GRC board to ensure that it is not less than the structural design strength;

[0057] Step 106, design the reserved hole diameter to be 2 cm larger than the casing diameter;

[0058] Step 107, design the steel mesh in the prefabricated plate, and make sure that the steel bar type and spacing are the same as the single-layer reinforcement of the pipe well structure plate;

[0059] Step 108: For areas with a large number of holes, adjust the steel bar layout to follow the principle of connecting as much as possible;

[0060] Step 109, design the opening and the four-side reinforcement ribs so that the four-side reinforcement ribs extend out of the plate surface as positioning ribs;

[0061] Step 110: Design the position of the lifting ring on the prefabricated board to ensure the convenience of lifting.

[0062] Furthermore, the step S20 specifically includes the following steps:

[0063] Step 201: prepare GRC raw materials, including cement, sand, glass fiber, fly ash, and admixtures;

[0064] Step 202, weighing various raw materials according to the optimized ratio;

[0065] Step 203, putting the weighed raw materials into the mixer in order;

[0066] Step 204, start the mixer and stir until the GRC slurry is uniform;

[0067] Step 205, preparing the prefabricated pipe well bottom mold, cleaning it and applying a release agent;

[0068] Step 206: Place a steel mesh at the bottom of the mold to ensure accurate positioning;

[0069] Step 207, pouring the stirred GRC slurry into a mold and vibrating to exhaust the air;

[0070] Step 208, smoothing the surface of the GRC slurry to ensure that the surface is flat;

[0071] Step 209, curing the GRC prefabricated parts for no less than 7 days;

[0072] Step 210, demoulding and inspecting the quality of the prefabricated pipe well bottom mold, and storing it after it is qualified.

[0073] Further, the step S30 specifically comprises the following steps:

[0074] Step 301, prepare GRC raw materials, with the same proportion as the prefabricated pipe well bottom mold;

[0075] Step 302, making a stop bar mold, including a straight line segment and a corner segment;

[0076] Step 303, placing a 6 mm diameter steel bar in the mold to prevent the stop bar from breaking;

[0077] Step 304, pouring the GRC slurry into the mold and vibrating to exhaust the air;

[0078] Step 305, forming a groove on the upper part of the stop bar for placing the structural plate reinforcement;

[0079] Step 306, determine the length of the bar according to the size of the pipe well to avoid it being too long;

[0080] Step 307, calculate the height of the stop bar to make it equal to the thickness of the pipe well structure plate minus 3 cm;

[0081] Step 308: Maintain the GRC strip for no less than 7 days;

[0082] Step 309, demoulding and checking the quality of the stop bar to ensure that there are no defects;

[0083] Step 310: Classify and store the bars according to the size of the pipe well to facilitate subsequent use.

[0084] Furthermore, the step S40 specifically includes the following steps:

[0085] Step 401, analyzing the frame beam structure around the pipe well to determine the position of adding the lugs;

[0086] Step 402, designing U-shaped stirrups and determining the stirrup diameter to be 8 mm;

[0087] Step 403, calculate the length of the U-shaped stirrup side anchored into the frame beam to ensure a firm connection;

[0088] Step 404, design the corner reinforcement, using 8 mm diameter grade 3 steel;

[0089] Step 405, determine that the width of the concrete lug is 8 cm;

[0090] Step 406, design the size of the prefabricated pipe well bottom mold so that its length entering the ear is 6 cm; Step 407, calculate the reserved error adjustment space to be 2 cm;

[0091] Step 408, draw a detailed structure diagram of the ear, including a reinforcement diagram;

[0092] Step 409, making a cantilever steel bar skeleton to ensure accurate size;

[0093] Step 410, tie and fix the ear steel bar skeleton and the main reinforcement of the frame beam.

[0094] Furthermore, the step S50 specifically includes the following steps:

[0095] Step 501: Use a tower crane to hoist the prefabricated pipe well bottom mold to a designated pipe well opening;

[0096] Step 502, comparing the current layer riser distribution map, confirming the non-through holes that need to be drilled;

[0097] Step 503: Use a screwdriver to chisel out the non-through holes that need to be opened;

[0098] Step 504: Use a handheld angle grinder to cut the fibers and grind and trim the edges;

[0099] Step 505: Use a level ruler to check the levelness of the precast panel;

[0100] Step 506: placing a customized target plate on the reserved holes of the upper and lower layers;

[0101] Step 507, selecting holes in the diagonal direction as positioning holes;

[0102] Step 508, set up two plumb lines and align them with the positioning holes at the same time;

[0103] Step 509, start the plumb line instrument and project a laser point into the positioning hole;

[0104] Step 510: manually tilt the prefabricated plate so that the laser points in the two holes are adjusted to the center of the circle. Further, the step S60 specifically includes the following steps:

[0105] Step 601, clean the surrounding surface of the prefabricated pipe well bottom mold to ensure that there is no dust or impurities;

[0106] Step 602: prepare epoxy resin glue or marble glue;

[0107] Step 603, applying adhesive to the bottom of the prefabricated stop strip;

[0108] Step 604, aligning the prefabricated stop strips with the edges around the prefabricated pipe well bottom mold;

[0109] Step 605: Gently press the prefabricated stop bar to ensure that it fits tightly with the prefabricated board;

[0110] Step 606, check whether the grooves on the prefabricated stop bar correspond correctly;

[0111] Step 607, use a fixture to fix the prefabricated stop bar for more than 24 hours;

[0112] Step 608, check the bonding effect to ensure there is no looseness;

[0113] Step 609, clean up excess adhesive to keep the seam clean;

[0114] Step 610, measure the height of the top surface of the stop bar to ensure that it is consistent with the elevation of the structural plate surface.

[0115] Furthermore, the step S70 specifically includes the following steps:

[0116] Step 701, prepare a concrete curing film, ensuring that the size is sufficient to cover the precast panel surface;

[0117] Step 702: clean the prefabricated panel surface to remove dust and impurities;

[0118] Step 703, laying the film on the prefabricated board surface to ensure that there are no wrinkles;

[0119] Step 704: sprinkle water evenly on the film and add weight to prevent displacement;

[0120] Step 705, check whether the edge of the film completely covers the prefabricated board;

[0121] Step 706: prepare structural layer concrete and mix it according to the proportion;

[0122] Step 707: Use pumping equipment to transport concrete to the pouring location;

[0123] Step 708, pouring concrete evenly to avoid concentrated impact on the precast slab;

[0124] Step 709: Use a vibrating rod to vibrate the concrete to ensure compactness;

[0125] Step 710: Smooth the concrete surface to make it flush with the precast panel surface.

[0126] Furthermore, the step S80 specifically includes the following steps:

[0127] Step 801, making a water stop ring according to the design drawing to ensure accurate size;

[0128] Step 802, cleaning the surface of the steel casing to remove oil stains and rust;

[0129] Step 803, marking the welding position of the water stop ring on the steel casing;

[0130] Step 804, put the water stop ring on the steel casing and align it with the welding position;

[0131] Step 805: Use a welding machine to weld the water stop ring to the steel casing;

[0132] Step 806, cleaning the weld and removing welding slag;

[0133] Step 807, check welding quality to ensure there is no leakage;

[0134] Step 808, carefully place the steel casing on the reserved hole of the prefabricated plate;

[0135] Step 809, check whether the steel casing is centered and adjust it if necessary;

[0136] Step 810: Install the pipe well riser, ensuring it is concentric with the steel casing.

[0137] Furthermore, the step S90 specifically includes the following steps:

[0138] Step 901, prepare micro-expansion fine stone concrete, the strength of which is one level higher than that of structural concrete;

[0139] Step 902: clean the surface of the pipe well structure plate to ensure that there is no debris;

[0140] Step 903, check the sealing condition around the steel casing to prevent slurry leakage;

[0141] Step 904, pouring slightly expanded fine stone concrete to the designed elevation;

[0142] Step 905: Use a vibrating rod to vibrate the concrete to ensure that it is tightly bonded to the precast slab;

[0143] Step 906: Use a scraper to scrape the concrete surface to keep it flat;

[0144] Step 907, after the concrete has initially set, perform the first calendering;

[0145] Step 908: Perform a second calendering at an appropriate time to improve surface flatness;

[0146] Step 909, curing the concrete to keep the surface moist;

[0147] Step 910: Check the molding effect to ensure that the requirements of the building decoration layer are met.

[0148] Compared with the prior art, the water pipe well construction method provided by the present invention has the following beneficial effects:

[0149] First, the present invention uses GRC (glass fiber reinforced cement) material to make the prefabricated pipe well bottom mold, which significantly improves the performance of the prefabricated parts. The multi-objective optimization model is used to optimize the ratio, so that the GRC material achieves the best balance in terms of compressive strength, flexural strength, impermeability and shrinkage, meeting the various performance requirements of the water pipe well. This not only solves the problem of poor performance of traditional prefabricated materials, but also improves the durability and service life of the prefabricated parts;

[0150] Secondly, the present invention designs an innovative prefabricated pipe well bottom mold structure, including the design of through holes and non-through holes, as well as the design of additional steel bars on the four sides that are reinforced and extend out of the board surface. This structural design greatly improves the connection reliability between the prefabricated parts and the cast-in-place structure, and effectively prevents the occurrence of cracks and leakage. At the same time, the design of reserved holes facilitates the installation of subsequent pipelines, improving the flexibility and adaptability of construction;

[0151] Furthermore, the present invention adopts the double plumb positioning technology, combined with the artificial tilting adjustment of the prefabricated plate, which greatly improves the installation accuracy of the prefabricated pipe well bottom mold. This solves the problem of low positioning accuracy of traditional prefabricated parts, ensures the accuracy of pipeline installation, and lays a good foundation for subsequent construction;

[0152] In addition, the present invention innovatively adopts the method of using prefabricated stop bars in conjunction with prefabricated pipe well bottom molds, effectively solving the connection problem between prefabricated parts and cast-in-place structures. The groove design on the prefabricated stop bars provides a good shelf space for the structural plate reinforcement, further enhancing the integrity of the structure;

[0153] In terms of the installation of the pipe well riser, the present invention effectively solves the waterproof problem at the connection between the riser and the prefabricated plate by welding a water stop ring on the steel casing and using micro-expansion fine stone concrete for secondary pouring, thereby greatly reducing the risk of leakage.

[0154] Finally, the construction method of the present invention significantly improves construction efficiency and shortens the construction period. The factory production of prefabricated parts not only ensures product quality, but also greatly reduces on-site construction time. At the same time, this method greatly reduces the impact of on-site construction on the environment, reduces the generation of noise, dust and construction waste, and conforms to the concept of green buildings;

[0155] To sum up, the water pipe well construction method of the present invention has made remarkable progress in material properties, structural design, installation accuracy, connection reliability, waterproof performance, construction efficiency and environmental friendliness, effectively solving various problems existing in the prior art and providing a new and efficient solution for water pipe well construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0156] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0157] Figure 1 The present invention is a flow chart of a water pipe well construction method;

[0158] Figure 2 A flow chart of step S20 of a water pipe well construction method;

[0159] Figure 3 This is an example diagram of a prefabricated pipe well bottom mold for a water pipe well construction method;

[0160] Figure 4 A schematic diagram of a water pipe well construction method for picking up ears;

[0161] Figure 5 A schematic diagram of a prefabricated retaining strip for a water pipe well construction method. DETAILED DESCRIPTION

[0162] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0163] Embodiment 1:

[0164] like Figure 3 , Figure 4 , Figure 5 As shown, the following is a specific embodiment written according to a specific implementation method of the present invention:

[0165] In a high-rise residential project, a water pipe well needs to be installed in a 30-story building. The building has a height of 3 meters per floor and a total height of 90 meters. This embodiment will describe in detail how to use the water pipe well construction method of the present invention to complete this task.

[0166] First, the prefabricated pipe well bottom mold was designed in depth. The designers analyzed the distribution map of the risers on each floor and found that the building had 4 full-length risers, which were used for water supply, drainage, fire protection and HVAC. The positions of these 4 full-length risers were designed as through holes. In addition, there are 2-3 non-through-length risers on each floor, and their positions are designed as non-through holes. The designers established a universal prefabricated pipe well bottom template block model, which contains 4 through holes and 3 non-through holes. The thickness of the prefabricated pipe well bottom template is designed to be 3 cm and is made of GRC material. Calculations show that the compressive strength of the required GRC board is not less than C30. The diameter of the reserved hole is designed to be 2 cm larger than the diameter of the casing, that is, the diameter of the water supply riser hole is 12 cm, the diameter of the drainage riser hole is 16 cm, the diameter of the fire riser hole is 14 cm, and the diameter of the HVAC riser hole is 18 cm. The steel mesh in the prefabricated panel is designed with Φ8@200mm bidirectional reinforcement, which is the same as the single-layer reinforcement of the pipe well structure panel. For areas with more holes, the layout of the steel bars is adjusted to follow the principle of "if it can be passed, it can be passed". The reinforcement bars at the opening and the four sides are Φ10mm steel bars, and the reinforcement bars on the four sides extend 10 cm from the panel surface as positioning bars. Four lifting ring positions are designed on the prefabricated panel to ensure the convenience of lifting.

[0167] Next, GRC materials are used to make the prefabricated pipe well bottom mold. First, prepare the GRC raw materials according to the optimal ratio obtained by the multi-objective optimization model. The ratio is: 38.5% cement, 41.2% sand, 2.8% glass fiber, 16.5% fly ash, and 1.0% admixture. According to this ratio, weigh various raw materials: 385kg cement, 412kg sand, 28kg glass fiber, 165kg fly ash, and 10kg admixture. Put these materials into the mixer in order, start the mixer and stir for 15 minutes until the GRC slurry is uniform. Then, prepare a prefabricated pipe well bottom mold with a size of 2.2 meters by 2.2 meters, clean it and apply a release agent. Place a steel mesh at the bottom of the mold to ensure accurate positioning. Pour the stirred GRC slurry into the mold, vibrate it for 3 minutes on a vibrating table to exhaust it, and smooth the surface of the slurry with a scraper to ensure a smooth surface. The GRC prefabricated parts are cured for 10 days, with the curing temperature controlled at 20±2℃ and the relative humidity kept above 95%. After the curing, the mold is removed and the quality of the prefabricated pipe well bottom mold is checked, and the qualified ones are put into storage.

[0168] At the same time, GRC materials are used to make prefabricated stoppers. The same GRC ratio as that used for the prefabricated pipe well bottom mold is used. The stopper mold is made, including straight sections and corner sections. A 6 mm diameter steel bar is placed in the mold to prevent the stopper from breaking. The GRC slurry is poured into the mold, vibrated and exhausted for 3 minutes, and a groove with a width of 2 cm and a depth of 1 cm is formed on the upper part of the stopper to hold the structural board reinforcement. According to the size of the pipe well, the length of the stopper is determined to be 2.2 meters and the height is 22 cm (the thickness of the pipe well structural board is 25 cm minus the thickness of the prefabricated board is 3 cm). The GRC stopper is cured for 10 days under the same curing conditions as the prefabricated pipe well bottom mold. After the curing is completed, the mold is removed and the quality of the stopper is checked to ensure that there are no defects, and it is stored according to the size of the pipe well.

[0169] Add concrete ears to the frame beams around the pipe well. Design U-shaped stirrups, use 8mm diameter steel bars, and the length of the U-shaped stirrups anchored into the frame beam is 20 cm to ensure a firm connection. The angle bars are made of 8mm diameter grade 3 steel, and the width of the concrete ears is 8 cm. The length of the prefabricated pipe well bottom mold entering the ears is 6 cm, and the error adjustment space is reserved for 2 cm. Make the steel bar skeleton of the ears, ensure the size is accurate, and tie it to the main reinforcement of the frame beam.

[0170] At the construction site, a 50-ton tower crane was used to hoist the prefabricated pipe well bottom mold to the designated pipe well opening. Compare the riser distribution map of the current layer to confirm the non-through holes that need to be opened. Use an electric screwdriver to chisel out the non-through holes that need to be opened, and use a handheld angle grinder to cut the fibers and grind and trim. Use a level ruler to check the levelness of the prefabricated board, place customized target plates on the reserved holes on the upper and lower layers, and select the water supply riser holes and drainage riser holes in the diagonal direction as positioning holes. Set up two laser plumb meters, align them with the positioning holes at the same time, start the plumb meters, and project the laser point into the positioning hole. Four workers tilted the prefabricated board so that the laser points in the two holes were adjusted to the center of the circle, and the deviation was controlled within ±2 mm.

[0171] After the adjustment is completed, clean the surface around the prefabricated pipe well bottom mold to ensure that there is no dust or impurities. Prepare epoxy resin glue, apply a 2 mm thick adhesive on the bottom of the prefabricated stop bar, align it with the edges around the prefabricated pipe well bottom mold, and press gently to ensure a close fit with the prefabricated board. Check whether the grooves on the prefabricated stop bar correspond correctly, and use a clamp to fix the prefabricated stop bar for more than 24 hours. Check the bonding effect to ensure that there is no looseness, clean up the excess adhesive, and keep the joints clean. Measure the top surface height of the stop bar to ensure that it is consistent with the elevation of the structural board surface.

[0172] Next, prepare the PE film for concrete curing, which is 2.5 meters by 2.5 meters in size, enough to cover the precast panel surface. Clean the precast panel surface, remove dust and impurities, lay the film on the precast panel surface, ensure that there are no wrinkles, and sprinkle 2 liters of water evenly on the film to increase the weight to prevent displacement. Prepare C30 structural layer concrete, mix it according to the cement: sand: stone: water ratio of 1:1.57:2.36:0.5, and use pumping equipment to transport the concrete to the pouring location. Pour the concrete evenly to avoid concentrated impact on the precast panel, and the pouring height is 22 cm. Use a Φ50mm inserted vibrator to vibrate the concrete, and the vibration time is 20-30 seconds / point to ensure density. Finally, use a wooden trowel to smooth the concrete surface and make it flush with the precast panel surface.

[0173] After the initial setting of the concrete, install the pipe well riser. First, make a water stop ring according to the design drawings, with an outer diameter 4 cm larger than the pipe and a thickness of 5 mm. Clean the surface of the steel casing, remove oil and rust, and mark the welding position of the water stop ring on the steel casing. Put the water stop ring on the steel casing, align it with the welding position, and weld it to the steel casing using manual arc welding. The electrode model is E4303 and the welding current is 80-100A. Clean the weld, remove the welding slag, and use the color penetrant flaw detection method to check the welding quality to ensure that there is no leakage. Carefully place the steel casing on the reserved hole of the prefabricated panel, use a spirit level to check whether it is centered, and adjust it if necessary. Install the pipe well riser to ensure that it is concentric with the steel casing, and the deviation is controlled within 3 mm.

[0174] Finally, the secondary pouring of the pipe well structural slab concrete is carried out. Prepare micro-expansion fine stone concrete with a strength grade of C35, which is one level higher than the structural concrete. The micro-expansion agent dosage is 8% of the cement dosage. Clean the surface of the pipe well structural slab to ensure that there is no debris, and check the sealing around the steel casing to prevent leakage. Pour the micro-expansion fine stone concrete to the designed elevation with a thickness of 3 cm. Use a Φ25mm inserted vibrator to vibrate the concrete, and the vibration time is 15-20 seconds / point to ensure that it is tightly combined with the precast slab. Use a scraper to scrape the concrete surface and keep it flat. After the concrete is initially set (about 2 hours), the first calendering is carried out, using a hand-held trowel with a speed of 60-90 rpm. After 3 hours, the second calendering is carried out, and the speed is increased to 90-120 rpm to improve the flatness of the surface. Then, the concrete is cured, and the curing agent is sprayed on the surface for no less than 7 days. Finally, check the molding effect to ensure that it meets the requirements of the building decoration layer and the surface flatness deviation is no more than 2 mm / 2 m.

[0175] Quality control measures are strictly implemented throughout the construction process. For the production of GRC materials, samples are taken from each batch for compressive strength, flexural strength, impermeability and shrinkage tests to ensure that they meet the design requirements. The dimensional error of the prefabricated pipe well bottom mold is controlled within ±2 mm, and the surface flatness is controlled within 2 mm / 2 meters. The thickness of the steel bar protective layer is controlled at 20±5 mm. During the concrete pouring process, samples are taken every 100 cubic meters to make test blocks for compressive strength testing.

[0176] The main quality control data during the construction process are shown in the following table:

[0177] Control Project Control indicators Measured data Eligibility GRC compressive strength ≥30MPa 32.5MPa qualified GRC flexural strength ≥10MPa 11.2MPa qualified GRC anti-seepage performance ≥P8 P10 qualified GRC shrinkage ≤0.1％ 0.08％ qualified Precast panel size error ±2mm +1.5mm qualified Precast panel surface flatness 2mm / 2m 1.8mm / 2m qualified Steel bar cover thickness 20±5mm 18mm qualified Structural concrete strength C30 31.8MPa qualified Strength of micro-expanded fine aggregate concrete C35 36.5MPa qualified Flatness of pipe well structure plate 2mm / 2m 1.5mm / 2m qualified

[0178] By adopting the water pipe well construction method of the present invention, the construction quality of the water pipe well of the high-rise residential project has been significantly improved. The use of prefabricated pipe well bottom molds greatly reduces on-site wet work and improves construction efficiency. The application of GRC materials makes prefabricated components lighter and more durable, and is easy to transport and install. The application of multi-objective optimization models ensures the optimization of GRC material performance. The precise positioning method ensures the verticality and concentricity of the pipe well. The use of micro-expanded fine stone concrete improves the integrity and waterproof performance of the structure.

[0179] During the construction of the water pipe wells of the entire 30-story building, the average construction time per floor was shortened from 5 days using traditional methods to 3 days, and the overall construction efficiency was increased by 40%. The material loss rate was reduced from the original 8% to 3%, saving a lot of resources. The finished product protection is more convenient, reducing the probability of rework in the later stage. In the end, the water pipe well construction quality of the project was rated as excellent, which won unanimous praise from the owner and the supervisor.

[0180] Embodiment 2:

[0181] like Figure 1 , Figure 2 FIG. 2 is a second embodiment of a water pipe well construction method provided by the present invention. In this embodiment, the following steps are included:

[0182] S10. Conduct in-depth design of the prefabricated pipe well bottom mold, and design through holes and non-through holes;

[0183] S20, use GRC material to make the prefabricated pipe well bottom mold, with steel mesh inside, and additional steel bars on the four sides to strengthen and extend out of the board surface;

[0184] S30, use GRC material to make prefabricated stop bars, with steel bars inside and grooves on the top;

[0185] S40. Add concrete ears to the frame beams around the pipe well. The length of the ear that enters the ear is 6 cm when the size of the prefabricated pipe well bottom mold is designed;

[0186] S50, hoist the prefabricated pipe well bottom mold to the designated pipe well opening, use two plumb lines to position it simultaneously, and adjust the laser points in the two holes to the center of the circle by manually tilting the prefabricated plate;

[0187] S60, using epoxy resin glue or marble glue to bond the prefabricated stopper strip around the prefabricated pipe well bottom mold;

[0188] S70, laying a concrete curing film on the precast slab surface and pouring structural layer concrete;

[0189] S80, install the pipe well riser, make and weld the water stop ring on the steel casing, and place the steel casing on the reserved hole of the prefabricated plate;

[0190] S90, use micro-expansion fine stone concrete for secondary pouring of pipe well structure slab concrete, and use secondary calendering process on the surface;

[0191] GRC materials are optimized using a multi-objective optimization model. The specific steps include:

[0192] S21. Obtaining experimental data, including physical properties of prefabricated pipe well bottom molds made of GRC materials with various ratios and each ratio and steel mesh, including compressive strength, flexural strength, impermeability and shrinkage; the ratio is specifically the ratio of cement, sand, glass fiber, fly ash and admixture;

[0193] S22, establishing a mapping relationship between the proportion of each component in the GRC material and each physical property, wherein the mapping relationship is a combination of a linear relationship, a power relationship, a reciprocal relationship, and a logarithmic relationship;

[0194] S23, according to the mapping relationship, establish a relationship model equation group between each physical property and the ratio, including a compressive strength equation, a flexural strength equation, an anti-permeability performance equation and a shrinkage rate equation;

[0195] S24, fitting the relationship model equation group using the experimental data to obtain a fitting equation group;

[0196] S25. Establishing a multi-objective optimization model according to the fitting equation group, and determining the constraint conditions of the multi-objective optimization model;

[0197] S26, solving the multi-objective optimization model and obtaining 10 non-inferior solutions;

[0198] S27. Conduct a small-scale experiment on each non-inferior solution and select the ratio with the best physical properties of the prefabricated pipe well bottom mold made of steel mesh as the final ratio of GRC material.

[0199] The mapping relationship is specifically expressed as follows:

[0200]

[0201] Where, f is the physical property (such as compressive strength, flexural strength, etc.); x1, x2, x3, x4, x5 are the mass fractions of cement, sand, glass fiber, fly ash, and admixture respectively; a0, a i ,b i ,c i ,d i ,e ij is the unknown coefficient; ε is the error term.

[0202] According to the mapping relationship, a relationship model equation group between each physical property and the mix ratio is established, including a compressive strength equation, a flexural strength equation, an anti-permeability performance equation and a shrinkage rate equation;

[0203] Wherein, in the above technical solution, step S10 specifically includes the following steps:

[0204] Step 101, analyzing the distribution pattern of the risers in each manhole, comparing the changes in the positions of the risers on different floors, and determining the positions of the full-length risers;

[0205] Step 102, designing the positions of the full-length risers as through holes, and designing the positions of the other risers as non-through holes;

[0206] Step 103, establishing a universal plate model for each tube well, including through holes and non-through holes;

[0207] Step 104, design the prefabricated pipe well bottom template to be 3 cm thick, and determine to use GRC material;

[0208] Step 105, calculate the required compressive strength of the GRC board to ensure that it is not less than the structural design strength;

[0209] Step 106, design the reserved hole diameter to be 2 cm larger than the casing diameter;

[0210] Step 107, design the steel mesh in the prefabricated plate, and make sure that the steel bar type and spacing are the same as the single-layer reinforcement of the pipe well structure plate;

[0211] Step 108: For areas with a large number of holes, adjust the steel bar layout to follow the principle of connecting as much as possible;

[0212] Step 109, design the opening and the four-side reinforcement ribs so that the four-side reinforcement ribs extend out of the plate surface as positioning ribs;

[0213] Step 110: Design the position of the lifting ring on the prefabricated board to ensure the convenience of lifting.

[0214] The specific implementation method of step S10 is: first, analyze the distribution law of each pipe shaft riser, compare the changes in the position of the risers on different floors, and determine the position of the full-length riser. The position of the full-length riser is designed as a through hole, and the position of the remaining risers is designed as a non-through hole. Then, a common plate model for each pipe shaft is established, including through holes and non-through holes. Next, the thickness of the prefabricated pipe shaft bottom template is designed to be 3 cm, and it is determined to be made of GRC material. Next, calculate the compressive strength of the required GRC board to ensure that it is not lower than the structural design strength. After that, design the diameter of the reserved hole to make it 2 cm larger than the diameter of the casing. Subsequently, design the steel mesh in the prefabricated board, and determine that the steel bar model and spacing are the same as the single-layer reinforcement of the pipe shaft structural board. For areas with a large number of holes, adjust the layout of the steel bars to follow the principle of "if it can be connected, it can be connected". Finally, design the reinforcement bars at the opening and four sides so that the reinforcement bars on the four sides extend out of the board surface as positioning bars, and design the position of the lifting ring on the prefabricated board to ensure the convenience of lifting.

[0215] Furthermore, in the above technical solution, step S20 specifically includes the following steps:

[0216] Step 201: prepare GRC raw materials, including cement, sand, glass fiber, fly ash, and admixtures;

[0217] Step 202, weighing various raw materials according to the optimized ratio;

[0218] Step 203, putting the weighed raw materials into the mixer in order;

[0219] Step 204, start the mixer and stir until the GRC slurry is uniform;

[0220] Step 205, prepare the prefabricated pipe well bottom mold, clean it and apply a release agent;

[0221] Step 206: Place a steel mesh at the bottom of the mold to ensure accurate positioning;

[0222] Step 207, pouring the stirred GRC slurry into a mold and vibrating to exhaust the air;

[0223] Step 208, smoothing the surface of the GRC slurry to ensure that the surface is flat;

[0224] Step 209, curing the GRC prefabricated parts for no less than 7 days;

[0225] Step 210, demoulding and checking the quality of the prefabricated pipe well bottom mold, and storing it after it is qualified.

[0226] The specific implementation method of step S20 is: first, prepare GRC raw materials, including cement, sand, glass fiber, fly ash and admixtures. Then, weigh various raw materials according to the optimized ratio, and put them into the mixer in order, and start the mixer until the GRC slurry is uniform. Next, prepare the prefabricated pipe well bottom mold mold, clean and apply the release agent, and place the steel mesh at the bottom of the mold to ensure the accurate position. After that, pour the stirred GRC slurry into the mold, vibrate to exhaust, and smooth the surface of the slurry to ensure the surface is flat. Subsequently, the GRC prefabricated parts are maintained for no less than 7 days. Finally, demould and check the quality of the prefabricated pipe well bottom mold, and put it into storage after passing the test.

[0227] Further, in the above technical solution, step S30 specifically includes the following steps:

[0228] Step 301, prepare GRC raw materials, and mix them in the same proportion as the prefabricated pipe well bottom mold;

[0229] Step 302, making a stop bar mold, including a straight line segment and a corner segment;

[0230] Step 303, placing a 6 mm diameter steel bar in the mold to prevent the stop bar from breaking;

[0231] Step 304, pouring the GRC slurry into the mold and vibrating to exhaust the air;

[0232] Step 305, forming a groove on the upper part of the stop bar for placing the structural plate reinforcement;

[0233] Step 306, determine the length of the bar according to the size of the pipe well to avoid it being too long;

[0234] Step 307, calculate the height of the stop bar to make it equal to the thickness of the pipe well structure plate minus 3 cm;

[0235] Step 308: Maintain the GRC strip for no less than 7 days;

[0236] Step 309, demoulding and checking the quality of the stop bar to ensure that there are no defects;

[0237] Step 310: Classify and store the bars according to the size of the pipe well to facilitate subsequent use.

[0238] The specific implementation method of step S30 is: first, prepare the GRC raw materials and mix them in the same proportion as the prefabricated pipe well bottom mold. Then, make a stopper mold, including a straight section and a corner section. Place a 6 mm diameter steel bar in the mold to prevent the stopper from breaking. After that, pour the GRC slurry into the mold, vibrate to exhaust the air, and form a groove on the upper part of the stopper to hold the structural board ribs. Determine the length of the stopper according to the size of the pipe well to avoid it being too long, and calculate the height of the stopper so that it is equal to the thickness of the pipe well structure plate minus 3 cm. Next, maintain the GRC stopper for no less than 7 days. Finally, demold and check the quality of the stopper to ensure that there are no defects, and store them according to the size of the pipe well for subsequent use.

[0239] Furthermore, in the above technical solution, step S40 specifically includes the following steps:

[0240] Step 401, analyzing the frame beam structure around the pipe well to determine the position of adding the lugs;

[0241] Step 402, designing U-shaped stirrups and determining the stirrup diameter to be 8 mm;

[0242] Step 403, calculate the length of the U-shaped stirrup side anchored into the frame beam to ensure a firm connection;

[0243] Step 404, design the corner reinforcement, using 8 mm diameter grade 3 steel;

[0244] Step 405, determine that the width of the concrete lug is 8 cm;

[0245] Step 406, design the size of the prefabricated pipe well bottom mold so that its length entering the ear is 6 cm;

[0246] Step 407, calculating the reserved error adjustment space as 2 cm;

[0247] Step 408, draw a detailed structure diagram of the ear, including a reinforcement diagram;

[0248] Step 409, making a cantilever steel bar skeleton to ensure accurate size;

[0249] Step 410, tie and fix the ear steel bar skeleton and the main reinforcement of the frame beam.

[0250] The specific implementation method of step S40 is: first, analyze the structure of the frame beams around the pipe well to determine the position of adding the lugs. Then, design the U-shaped stirrups, determine that the diameter of the stirrups is 8 mm, and calculate the length of the U-shaped stirrups anchored into the frame beam to ensure a firm connection. Next, design the angle bars, use grade 3 steel with a diameter of 8 mm, and determine that the width of the concrete lug is 8 cm. After that, design the size of the prefabricated pipe well bottom mold so that the length it enters into the lug is 6 cm, and calculate the reserved error adjustment space to be 2 cm. Then, draw a detailed structural drawing of the lug, including a reinforcement drawing. Subsequently, make the steel skeleton of the lug to ensure accurate size, and tie it to the main reinforcement of the frame beam.

[0251] Furthermore, in the above technical solution, step S50 specifically includes the following steps:

[0252] Step 501: Use a tower crane to hoist the prefabricated pipe well bottom mold to the designated pipe well opening;

[0253] Step 502, comparing the current layer riser distribution map, confirming the non-through holes that need to be drilled;

[0254] Step 503, using a screwdriver to chisel out the non-through holes that need to be opened;

[0255] Step 504: Use a handheld angle grinder to cut the fibers and grind and trim the edges;

[0256] Step 505: Use a level ruler to check the levelness of the precast panel;

[0257] Step 506: placing a customized target plate on the reserved holes of the upper and lower layers;

[0258] Step 507, selecting holes in the diagonal direction as positioning holes;

[0259] Step 508, set up two plumb lines and align them with the positioning holes at the same time;

[0260] Step 509, start the plumb line instrument and project a laser point into the positioning hole;

[0261] Step 510: manually tilt the prefabricated plate so that the laser points in the two holes are adjusted to the center of the circle.

[0262] The specific implementation method of step S50 is: first, use a tower crane to lift the prefabricated pipe well bottom mold to the designated pipe well opening. Then, compare the riser distribution map of the current layer to confirm the non-through holes that need to be opened. Next, use a screwdriver to chisel out the non-through holes that need to be opened, and use a handheld angle grinder to cut the fibers and grind and trim. After that, use a spirit level to check the levelness of the prefabricated board, place customized target plates on the reserved holes of the upper and lower layers, and select the holes in the diagonal direction as positioning holes. Subsequently, set up two plumb lines, align them with the positioning holes at the same time, start the plumb lines, and project a laser point into the positioning hole. Finally, by manually tilting the prefabricated board, adjust the laser points in the two holes to the center of the circle.

[0263] Furthermore, in the above technical solution, step S60 specifically includes the following steps:

[0264] Step 601, clean the surface around the prefabricated pipe well bottom mold to ensure that there is no dust or impurities;

[0265] Step 602: prepare epoxy resin glue or marble glue;

[0266] Step 603, applying adhesive to the bottom of the prefabricated stop strip;

[0267] Step 604, align the prefabricated stop strip with the edges around the prefabricated pipe well bottom mold;

[0268] Step 605: Gently press the prefabricated stop bar to ensure that it fits tightly with the prefabricated board;

[0269] Step 606, check whether the grooves on the prefabricated stop bar correspond correctly;

[0270] Step 607, use a fixture to fix the prefabricated stop bar for more than 24 hours;

[0271] Step 608, check the bonding effect to ensure there is no looseness;

[0272] Step 609, clean up excess adhesive to keep the seam clean;

[0273] Step 610, measure the height of the top surface of the stop bar to ensure that it is consistent with the elevation of the structural plate surface.

[0274] The specific implementation method of step S60 is: first, clean the surface around the prefabricated pipe well bottom mold to ensure that there is no dust or impurities. Then, prepare epoxy resin glue or marble glue, apply the adhesive to the bottom of the prefabricated stop bar, align it with the edges around the prefabricated pipe well bottom mold, and press gently to ensure a tight fit with the prefabricated board. Next, check whether the grooves on the prefabricated stop bar correspond correctly, and use a clamp to fix the prefabricated stop bar for more than 24 hours. After that, check the bonding effect to ensure that there is no looseness, clean up the excess adhesive, and keep the joints clean. Finally, measure the top surface height of the stop bar to ensure that it is consistent with the elevation of the structural board surface.

[0275] Furthermore, in the above technical solution, step S70 specifically includes the following steps:

[0276] Step 701, prepare a concrete curing film, ensuring that the size is sufficient to cover the precast panel surface;

[0277] Step 702: clean the prefabricated panel surface to remove dust and impurities;

[0278] Step 703, laying the film on the prefabricated board surface to ensure that there are no wrinkles;

[0279] Step 704: sprinkle water evenly on the film and add weight to prevent displacement;

[0280] Step 705, check whether the edge of the film completely covers the prefabricated board;

[0281] Step 706: prepare structural layer concrete and mix it according to the proportion;

[0282] Step 707: Use pumping equipment to transport concrete to the pouring location;

[0283] Step 708, pouring concrete evenly to avoid concentrated impact on the precast slab;

[0284] Step 709: Use a vibrating rod to vibrate the concrete to ensure compactness;

[0285] Step 710: Smooth the concrete surface to make it flush with the precast panel surface.

[0286] The specific implementation method of step S70 is as follows: First, prepare a film for concrete curing, ensuring that the size is sufficient to cover the precast panel surface. Then, clean the precast panel surface, remove dust and impurities, lay the film on the precast panel surface, ensure that there are no wrinkles, and sprinkle water evenly on the film to increase the weight to prevent displacement. Next, prepare the structural layer concrete, mix it according to the ratio, use pumping equipment to transport the concrete to the pouring position, pour the concrete evenly to avoid concentrated impact on the precast panel, and use a vibrating rod to vibrate the concrete to ensure density. Finally, smooth the concrete surface and make it flush with the precast panel surface.

[0287] Furthermore, in the above technical solution, step S80 specifically includes the following steps:

[0288] Step 801, making a water stop ring according to the design drawing to ensure accurate size;

[0289] Step 802, cleaning the surface of the steel casing to remove oil stains and rust;

[0290] Step 803, marking the welding position of the water stop ring on the steel casing;

[0291] Step 804, put the water stop ring on the steel casing and align it with the welding position;

[0292] Step 805: Use a welding machine to weld the water stop ring to the steel casing;

[0293] Step 806, cleaning the weld and removing welding slag;

[0294] Step 807, check welding quality to ensure there is no leakage;

[0295] Step 808, carefully place the steel casing on the reserved hole of the prefabricated plate;

[0296] Step 809, check whether the steel casing is centered and adjust it if necessary;

[0297] Step 810: Install the pipe well riser, ensuring it is concentric with the steel casing.

[0298] The specific implementation method of step S80 is: first, make the water stop ring according to the design drawings to ensure accurate size. Then, clean the surface of the steel casing, remove oil and rust, and mark the welding position of the water stop ring on the steel casing. Next, put the water stop ring on the steel casing, align it with the welding position, use a welding machine to weld it on the steel casing, clean the weld, remove the welding slag, and check the welding quality to ensure that there is no leakage. After that, carefully place the steel casing on the reserved hole of the prefabricated panel, check whether it is centered, and adjust it if necessary. Finally, install the pipe shaft riser to ensure that it is concentric with the steel casing.

[0299] Furthermore, in the above technical solution, step S90 specifically includes the following steps:

[0300] Step 901, prepare micro-expansion fine stone concrete, the strength of which is one level higher than that of structural concrete;

[0301] Step 902: clean the surface of the pipe well structure plate to ensure that there is no debris;

[0302] Step 903, check the sealing condition around the steel casing to prevent slurry leakage;

[0303] Step 904, pouring slightly expanded fine stone concrete to the designed elevation;

[0304] Step 905: Use a vibrating rod to vibrate the concrete to ensure that it is tightly bonded to the precast slab;

[0305] Step 906: Use a scraper to scrape the concrete surface to keep it flat;

[0306] Step 907, after the concrete has initially set, perform the first calendering;

[0307] Step 908: Perform a second calendering at an appropriate time to improve surface flatness;

[0308] Step 909, curing the concrete to keep the surface moist;

[0309] Step 910: Check the molding effect to ensure that the requirements of the building decoration layer are met.

[0310] The specific implementation method of step S90 is: first, prepare slightly expanded fine stone concrete, whose strength is one level higher than that of structural concrete. Then, clean the surface of the pipe well structure plate to ensure that there is no debris, and check the sealing around the steel casing to prevent leakage. Next, pour the slightly expanded fine stone concrete to the designed elevation, use a vibrating rod to vibrate the concrete to ensure that it is tightly combined with the precast panel, and use a scraper to scrape the concrete surface to keep it flat. After that, after the concrete is initially set, perform the first calendering, and perform the second calendering at an appropriate time to improve the flatness of the surface. Then, perform concrete maintenance to keep the surface moist. Finally, check the molding effect to ensure that the requirements of the building decoration layer are met.

[0311] Specifically, the principle of the present invention is:

[0312] The water pipe well construction method of the present invention can effectively solve the problems existing in the prior art, and its core principles lie in the following aspects:

[0313] Material optimization principle: The present invention uses GRC materials to make prefabricated pipe well bottom molds, and optimizes the ratio through a multi-objective optimization model. The principle of this method is to use mathematical models to balance various performance indicators, such as compressive strength, flexural strength, impermeability and shrinkage. By establishing a mapping relationship between each physical property and the material ratio, and fitting it using the least squares method, an accurate prediction model is obtained. This method can maximize the role of each component while ensuring the performance of each material, thereby obtaining the GRC material with the best performance;

[0314] Structural mechanics principles: The design of the prefabricated pipe well bottom mold fully considers the principles of mechanics. The design of through holes and non-through holes is based on the distribution law of pipe well risers, which not only ensures the integrity of the structure, but also meets the needs of pipeline layout on different floors. The design of additional steel bars on the four sides that extend out of the plate surface enhances the bending resistance of the prefabricated parts, while providing connection points with the cast-in-place structure, effectively transferring loads and ensuring the integrity of the structure;

[0315] Precision measurement principle: The dual plumb line positioning technology is used to utilize the high-precision characteristics of optical measurement. Two plumb lines are simultaneously aligned with the positioning holes in the diagonal direction to form a precise positioning system. By adjusting the prefabricated plate so that the laser points in the two holes are both located at the center of the circle, high-precision installation of the prefabricated parts is achieved. This method overcomes the limitations of traditional single-point positioning and greatly improves installation accuracy;

[0316] Interface connection principle: The use of prefabricated stop bars and prefabricated pipe well bottom molds reflects the importance of interface connection. The groove design on the stop bar provides an anchor point for the structural plate reinforcement, which enhances the connection strength between the prefabricated parts and the cast-in-place structure. At the same time, the use of epoxy resin glue or marble glue to bond the stop bar takes advantage of the high bonding strength and durability of these materials to ensure the reliability of the connection;

[0317] Waterproof principle: Welding a water stop ring on the steel casing and using micro-expansion fine stone concrete for secondary pouring embodies the principle of multiple waterproofing. The water stop ring acts as a physical barrier to prevent water from penetrating along the surface of the steel casing. Micro-expansion fine stone concrete uses its micro-expansion characteristics to fill tiny gaps during the hardening process, further improving the waterproof effect. At the same time, the micro-expansion characteristics also help reduce the occurrence of concrete shrinkage cracks;

[0318] Industrialized production principle: The factory production of prefabricated parts embodies the standardized and modular industrial production concept. Through a strictly controlled factory environment, the consistency and high quality of the products can be guaranteed. This method not only improves production efficiency, but also greatly reduces the uncertainty of on-site construction;

[0319] Green building principle: The method of the invention reduces wet work on site, reduces noise, dust and construction waste, and conforms to the concept of green building. This is not only reflected in environmental protection, but also achieves efficient use of resources by improving material utilization and reducing rework;

[0320] In summary, the water pipe well construction method of the present invention forms a set of systematic and scientific construction methods through the comprehensive application of multidisciplinary principles such as material science, structural mechanics, precision measurement, interface engineering, waterproof technology, industrial production and green building. This method can effectively solve the problems in the prior art, achieve high efficiency, high quality and environmental protection of water pipe well construction, and has strong technical innovation and practical value.

Claims

1. A water pipe well construction method, characterized in that: The following steps are involved: S10. Conduct in-depth design of the prefabricated pipe well bottom mold and design through holes and non-through holes; S20, using GRC material to make the prefabricated pipe well bottom mold, with a steel mesh inside, and additional steel bars on the four sides to strengthen and extend out of the plate surface; S30, use GRC material to make prefabricated stop bars, with steel bars inside and grooves on the top; S40, adding concrete ears on the frame beams around the pipe well, and the length of the prefabricated pipe well bottom mold entering the ears is 6 cm when the size is designed; S50, hoisting the prefabricated pipe well bottom mold to the designated pipe well opening, using two plumb lines to position it simultaneously, and manually tilting the prefabricated plate to adjust the laser points in the two holes to the center of the circle; S60, using epoxy resin glue or marble glue to bond the prefabricated stop strips around the prefabricated pipe well bottom mold; S70, laying a concrete curing film on the precast slab surface and pouring structural layer concrete; S80, install the pipe well riser, make and weld the water stop ring on the steel casing, and place the steel casing on the reserved hole of the prefabricated plate; S90, use micro-expansion fine stone concrete for secondary pouring of pipe well structure slab concrete, and use secondary calendering process on the surface; The GRC material is optimized by using a multi-objective optimization model, and the specific steps include: S21, obtaining experimental data, including physical properties of the prefabricated pipe well bottom mold made of GRC materials with various ratios and each ratio and steel mesh, including compressive strength, flexural strength, impermeability and shrinkage; the ratio is specifically the ratio of cement, sand, glass fiber, fly ash and admixture; S22, establishing a mapping relationship between the proportion of each component in the GRC material and each physical property, wherein the mapping relationship is a combination of a linear relationship, a power relationship, a reciprocal relationship, and a logarithmic relationship; S23, according to the mapping relationship, establish a relationship model equation group of each physical property and the ratio, including a compressive strength equation, a flexural strength equation, an anti-permeability performance equation and a shrinkage rate equation; S24, fitting the relationship model equation group using the experimental data to obtain a fitting equation group; S25, establishing a multi-objective optimization model according to the fitting equation group, and determining the constraint conditions of the multi-objective optimization model; S26, solving the multi-objective optimization model to obtain 10 non-inferior solutions; S27. Conduct a small-scale experiment on each non-inferior solution, and select the ratio with the best physical properties of the prefabricated pipe well bottom mold made with the steel mesh as the final ratio of the GRC material.

2. A water pipe well construction method according to claim 1, characterized in that: The S10 specifically includes the following steps: Step 101, analyzing the distribution pattern of the risers in each manhole, comparing the changes in the positions of the risers on different floors, and determining the positions of the full-length risers; Step 102, designing the positions of the full-length risers as through holes, and designing the positions of the other risers as non-through holes; Step 103, establishing a universal plate model for each tube well, including through holes and non-through holes; Step 104, design the prefabricated well bottom template to be 3 cm thick and determine to use GRC material; Step 105, calculate the required compressive strength of the GRC board to ensure that it is not less than the structural design strength; Step 106, design the reserved hole diameter to be 2 cm larger than the casing diameter; Step 107, design the steel mesh in the prefabricated plate, and make sure that the steel bar type and spacing are the same as the single-layer reinforcement of the pipe well structure plate; Step 108: For areas with a large number of holes, adjust the steel bar layout to follow the principle of connecting as much as possible; Step 109, design the opening and the four-side reinforcement ribs so that the four-side reinforcement ribs extend out of the plate surface as positioning ribs; Step 110: Design the position of the lifting ring on the prefabricated board to ensure the convenience of lifting.

3. A water pipe well construction method according to claim 2, characterized in that: The S20 specifically includes the following steps: Step 201: prepare GRC raw materials, including cement, sand, glass fiber, fly ash, and admixtures; Step 202, weighing various raw materials according to the optimized ratio; Step 203, putting the weighed raw materials into the mixer in order; Step 204, start the mixer and stir until the GRC slurry is uniform; Step 205, preparing the prefabricated pipe well bottom mold, cleaning it and applying a release agent; Step 206: Place a steel mesh at the bottom of the mold to ensure accurate positioning; Step 207, pouring the stirred GRC slurry into a mold and vibrating to exhaust the air; Step 208, smoothing the surface of the GRC slurry to ensure that the surface is flat; Step 209, curing the GRC prefabricated parts for no less than 7 days; Step 210, demoulding and inspecting the quality of the prefabricated pipe well bottom mold, and storing it after it is qualified.

4. A water pipe well construction method according to claim 3, characterized in that: The S30 specifically comprises the following steps: Step 301, prepare GRC raw materials, with the same proportion as the prefabricated pipe well bottom mold; Step 302, making a stop bar mold, including a straight line segment and a corner segment; Step 303, placing a 6 mm diameter steel bar in the mold to prevent the stop bar from breaking; Step 304, pouring the GRC slurry into the mold and vibrating to exhaust the air; Step 305, forming a groove on the upper part of the stop bar for placing the structural plate reinforcement; Step 306, determine the length of the bar according to the size of the pipe well to avoid it being too long; Step 307, calculate the height of the stop bar to make it equal to the thickness of the pipe well structure plate minus 3 cm; Step 308: Maintain the GRC strip for no less than 7 days; Step 309, demoulding and checking the quality of the stop bar to ensure that there are no defects; Step 310: Classify and store the bars according to the size of the pipe well to facilitate subsequent use.

5. A water pipe well construction method according to claim 4, characterized in that: The S40 specifically includes the following steps: Step 401, analyzing the frame beam structure around the pipe well to determine the position of adding the lugs; Step 402, designing U-shaped stirrups and determining the stirrup diameter to be 8 mm; Step 403, calculate the length of the U-shaped stirrup side anchored into the frame beam to ensure a firm connection; Step 404, design the corner reinforcement, using 8 mm diameter grade 3 steel; Step 405, determine that the width of the concrete lug is 8 cm; Step 406, design the size of the prefabricated pipe well bottom mold so that its length entering the ear is 6 cm; Step 407, calculating the reserved error adjustment space as 2 cm; Step 408, draw a detailed structure diagram of the ear, including a reinforcement diagram; Step 409, making a cantilever steel bar skeleton to ensure accurate size; Step 410, tie and fix the ear steel bar skeleton and the main reinforcement of the frame beam.

6. A water pipe well construction method according to claim 5, characterized in that: The S50 specifically includes the following steps: Step 501: Use a tower crane to hoist the prefabricated pipe well bottom mold to a designated pipe well opening; Step 502, comparing the current layer riser distribution map, confirming the non-through holes that need to be drilled; Step 503, using a screwdriver to chisel out the non-through holes that need to be opened; Step 504: Use a handheld angle grinder to cut the fibers and grind and trim the edges; Step 505: Use a level ruler to check the levelness of the precast panel; Step 506: placing a customized target plate on the reserved holes of the upper and lower layers; Step 507, selecting holes in the diagonal direction as positioning holes; Step 508, set up two plumb lines and align them with the positioning holes at the same time; Step 509, start the plumb line instrument and project a laser point into the positioning hole; Step 510: manually tilt the prefabricated plate so that the laser points in the two holes are adjusted to the center of the circle.

7. A water pipe well construction method according to claim 6, characterized in that: The S60 specifically includes the following steps: Step 601, clean the surrounding surface of the prefabricated pipe well bottom mold to ensure that there is no dust or impurities; Step 602: prepare epoxy resin glue or marble glue; Step 603, applying adhesive to the bottom of the prefabricated stop strip; Step 604, aligning the prefabricated stop strips with the edges around the prefabricated pipe well bottom mold; Step 605: Gently press the prefabricated stop bar to ensure that it fits tightly with the prefabricated board; Step 606, check whether the grooves on the prefabricated stop bar correspond correctly; Step 607, use a fixture to fix the prefabricated stop bar for more than 24 hours; Step 608, check the bonding effect to ensure there is no looseness; Step 609, clean up excess adhesive to keep the seam clean; Step 610, measure the height of the top surface of the stop bar to ensure that it is consistent with the elevation of the structural plate surface.

8. A water pipe well construction method according to claim 7, characterized in that: The S70 specifically includes the following steps: Step 701, prepare a concrete curing film, ensuring that the size is sufficient to cover the precast panel surface; Step 702: clean the prefabricated panel surface to remove dust and impurities; Step 703, laying the film on the prefabricated board surface to ensure that there are no wrinkles; Step 704: sprinkle water evenly on the film and add weight to prevent displacement; Step 705, check whether the edge of the film completely covers the prefabricated board; Step 706: prepare structural layer concrete and mix it according to the proportion; Step 707: Use pumping equipment to transport concrete to the pouring location; Step 708, pouring concrete evenly to avoid concentrated impact on the precast slab; Step 709: Use a vibrating rod to vibrate the concrete to ensure compactness; Step 710: Smooth the concrete surface to make it flush with the precast panel surface.

9. A water pipe well construction method according to claim 8, characterized in that: The S80 specifically includes the following steps: Step 801, making a water stop ring according to the design drawing to ensure accurate size; Step 802, cleaning the surface of the steel casing to remove oil stains and rust; Step 803, marking the welding position of the water stop ring on the steel casing; Step 804, put the water stop ring on the steel casing and align it with the welding position; Step 805: Use a welding machine to weld the water stop ring to the steel casing; Step 806, cleaning the weld and removing welding slag; Step 807, check welding quality to ensure there is no leakage; Step 808, carefully place the steel casing on the reserved hole of the prefabricated plate; Step 809, check whether the steel casing is centered and adjust it if necessary; Step 810: Install the pipe well riser, ensuring it is concentric with the steel casing.

10. A water pipe well construction method according to claim 9, characterized in that: The S90 specifically includes the following steps: Step 901, prepare micro-expansion fine stone concrete, the strength of which is one level higher than that of structural concrete; Step 902: clean the surface of the pipe well structure plate to ensure that there is no debris; Step 903, check the sealing condition around the steel casing to prevent slurry leakage; Step 904, pouring slightly expanded fine stone concrete to the designed elevation; Step 905: Use a vibrating rod to vibrate the concrete to ensure that it is tightly bonded to the precast slab; Step 906: Use a scraper to scrape the concrete surface to keep it flat; Step 907, after the concrete has initially set, perform the first calendering; Step 908: Perform a second calendering at an appropriate time to improve surface flatness; Step 909, curing the concrete to keep the surface moist; Step 910: Check the molding effect to ensure that the requirements of the building decoration layer are met.

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