Large-size pump station construction method

Abstract

The invention discloses a large-size pump station construction method, and relates to the technical field of constructional engineering. The invention discloses a large-volume pump station construction method. The method comprises the following steps: analyzing concrete stirring performance and warehousing strength; construction auxiliary preparation; treating a basic surface; processing a protective layer; mounting a template; constructing an embedded part; performing water stop construction; pouring concrete; and concrete curing. According to the method, the structural precision and durability are improved through foundation surface treatment, protection layer treatment, optimization of formwork reinforcement and a steel bar protection layer control method; through temperature control material pre-cooling, layered pouring and dynamic cooling, the temperature rise in the concrete is effectively inhibited, and the crack risk is reduced; an integrated curing measure is adopted, so that uniform development of concrete strength is ensured, and potential quality hazards are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of construction engineering, and in particular to a large-volume pump station construction method. Background Art

[0002] With the continuous advancement of urbanization, large-volume concrete pumping stations, as the core infrastructure of municipal engineering, have a direct impact on the stability of urban drainage systems due to their construction quality. The traditional large-volume pumping station construction process has significant technical bottlenecks: the internal temperature rise caused by the heat of concrete hydration often leads to structural cracking, especially in components with a cross-sectional size of more than 1m, where the temperature difference stress can reach 1.5-2 times the tensile strength of concrete, and the traditional layered pouring process is difficult to achieve effective control of the temperature gradient.

[0003] In the existing technology, temperature control measures mostly rely on a single cooling water pipe layout or surface covering maintenance, and have failed to form a full-cycle management system from raw material pre-cooling, temperature control during the pouring process to later maintenance. The formwork reinforcement technology is still mainly based on traditional tension bolts, which are not adaptable enough when facing complex curved structures. Concrete maintenance mostly uses manual sprinkling, and its uniformity is difficult to ensure. While the maintenance cycle is extended by 30-50%, there is still a 15-20% risk of leakage. These technical defects lead to a construction cold joint incidence rate as high as 5-8%, and the rework cost accounts for 3-5% of the total cost, which seriously restricts the improvement of project quality and economic benefits. At the same time, when pouring concrete, the lateral pressure of the concrete will cause uncontrollable deformation of the formwork, resulting in a high formwork scrap rate and high later maintenance costs.

[0004] Therefore, developing an integrated construction management system to achieve dynamic monitoring of template installation accuracy and build a material-machinery-process collaborative scheduling system has become a key technical issue that needs to be urgently solved in the field of large-volume pump station construction. Summary of the invention

[0005] The technical problem to be solved by the present invention is that the existing construction method has the problems of easy hydration and cracking of concrete, high occurrence rate of construction cold joints and high rate of template scrapping. The purpose is to provide a large-volume pump station construction method to solve the problems of easy hydration and cracking of concrete.

[0006] The present invention is achieved through the following technical solutions:

[0007] A large-volume pump station construction method comprises the following steps:

[0008] S1. Concrete mixing performance and entry strength analysis: Calculate the entry strength and concrete mixing capacity;

[0009] S2. Construction auxiliary preparation: prepare wind, water and electricity equipment and facilities for construction, and arrange construction roads and pedestrian passages;

[0010] S3. Foundation surface treatment: excavate the foundation surface, remove scum, sand and dirt, make the concrete base surface clean, and remove loose debris, debris, harmful substances and water on the surface. Vibrate and tamp the loose parts of the soil foundation;

[0011] S4. Protective layer treatment: pour concrete cushion on the cleaned foundation surface, pour concrete for leveling, and implant supporting steel bars;

[0012] S5. Formwork installation: Apply an adaptive coating on the surface of the memory alloy, dry it, heat it and apply pre-pressure, then make the formwork, use the embedded steel bars as the fixing points of the formwork reinforcement, set anchor bars around the bottom of the formwork at the back to prevent slipping, install the formwork, and use double-sided tape to seal the contact surface between the formwork and the concrete, as well as the joints of each formwork;

[0013] S6. Embedded parts construction: install the first-phase embedded parts and second-phase embedded parts, electromechanical equipment grounding system and auxiliary equipment pipelines at the construction location;

[0014] S7, Waterstop construction: After the embedded parts are installed, pour the concrete base, put in the waterstop sheet, and install the waterstop copper sheet and rubber waterstop strip at the construction gap, ensure that the groove is consistent with the expansion joint position, clean the surface impurities, and pour the concrete and vibrate it to make it dense;

[0015] S8. Concrete pouring: After the water-stopping construction, first lay a layer of cement mortar, pour concrete in layers, and vibrate and solidify the concrete;

[0016] S9. Concrete curing: After the concrete hardens, it is cured and covered with materials to keep the temperature difference between the inside and outside of the concrete within 0 to 20°C.

[0017] As a possible design, the above step S1 includes the following steps:

[0018] S11. Calculate the warehousing strength according to the following formula:

[0019] Qm=Qj*m*n*K 1 *K 2 *K 3 *K 4 ;

[0020] S12. Calculate the concrete production capacity based on the warehouse strength, specifically according to the following formula:

[0021]

[0022] in,

[0023] Q m is the practical productivity, m 3 / moon;

[0024] Qj technical productivity, m 3 / h;

[0025] m is the number of working days per month, which is 25 days;

[0026] n is the decimal number of hours worked per day, which is 17 hours;

[0027] K1 is the working condition (hoisting debris) coefficient, which is 0.8;

[0028] K2 is the time utilization coefficient, which is 0.85;

[0029] K3 is the productivity utilization coefficient, which is taken as 0.85;

[0030] K4 is the utilization coefficient of multiple mechanical equipment, which is 0.9;

[0031] P is the theoretical hourly capacity of the concrete production system, m 3 / h;

[0032] M is the average number of effective working days per month, days / month;

[0033] N is the effective working time per day, hours / day;

[0034] Kh is the safety factor, which is 1.5.

[0035] As a possible design, the above step S4 includes:

[0036] S41. Pour a 5-15 cm thick concrete cushion layer on the cleaned foundation surface and dry it;

[0037] S42. Implant supporting steel bars, with the supporting steel bars entering the rock 15 to 25 cm.

[0038] As a possible design, the above construction location includes the gate piers, station body and forebay of the pump station.

[0039] As a possible design, the above step S5 includes:

[0040] S51, modifying the carbon nanotubes with a coupling agent, adding the carbon nanotubes together with the conductive carbon black into N-methylpyrrolidone, mixing evenly, adding the polyurethane emulsion, and dispersing evenly to obtain an adaptive coating;

[0041] S52, spraying an adaptive coating on the surface of the Ni-Ti-Cu alloy, applying an electric field to induce, and then drying to obtain an adaptive material;

[0042] S53. Heat the adaptive material to 35±2℃ and apply pre-pressure to make the adaptive material shrink to 88-93% of the designed curvature. Make a formwork and remove impurities on the surface of the formwork. Use the embedded steel bars as the fixing points for the formwork reinforcement. Set anchor bars around the bottom of the formwork at the back to prevent slipping. Install the formwork. Use double-sided tape to seal the contact surface between the formwork and concrete, as well as the joints between each formwork.

[0043] As a possible design, the above-mentioned carbon nanotube coupling agent modification is specifically to ultrasonically treat the multi-walled carbon nanotubes with an acid solution, then add an ethanol solution of the coupling agent, and reflux for 3 to 4 hours at 55 to 65° C., wherein the acid solution includes a concentrated HNO solution with a volume ratio of (2.5 to 3.5): 1 3 and H 2 SO 4 The ultrasonic treatment is specifically 75-85° C. for 100-150 min; the coupling agent is a silane coupling agent, and the volume concentration of the coupling agent is 5-10%;

[0044] The Ni-Ti-Cu alloy surface is roughened, cleaned, and then sprayed with adaptive coating, spraying a film layer of 80-104 μm, standing for 5-10 minutes, and at a voltage of 300 V / mm and 0.1-0.3 mA / cm 2 , electric field induction at 35-40°C for 10-14 minutes, and then gradient drying and curing;

[0045] The pre-pressure is 8-12 MPa.

[0046] As a possible design, the above step S7 includes:

[0047] S71. After the embedded parts are installed, the concrete base is poured. After the age of the solidified concrete reaches 7 days, the water stop is placed so that the water stop is 20 to 30 cm higher than the concrete base. The water stop copper sheet is installed at the construction gap to ensure that the groove is consistent with the expansion joint position;

[0048] S72. Connect the rubber waterstop with the copper waterstop, clean the impurities on the surface of the waterstop, copper waterstop and rubber waterstop, and finally pour the concrete and vibrate it to make it dense.

[0049] As a possible design, the rubber waterstop strip and the copper waterstop plate are connected by riveting.

[0050] As a possible design, the thickness of the cement mortar is 4 to 8 cm.

[0051] As a possible design, the above-mentioned layered concrete pouring has a thickness of 30 to 50 cm for each layer, a front-to-back distance of 2 to 5 m between the upper and lower layers, and the joints of the same layer are fully vibrated. When pouring concrete on the slope base, start from a low place and rise layer by layer to maintain horizontal stratification.

[0052] As a possible design, the above-mentioned vibration is specifically that when vibrating the upper layer, it should be inserted into the lower layer by 4 to 8 cm, and the upper layer of concrete should be vibrated before the lower layer of concrete begins to set;

[0053] During the vibration process, the vibration time of each insertion point is 20 to 30 seconds;

[0054] The total thickness of the pouring layer is 1.0 to 2m, the step width is 1.0 to 1.5m, and the slope is not greater than 1:2;

[0055] After the poured concrete layer reaches 1.5Mpa, continue pouring the next layer.

[0056] As a possible design, the strength of the above concrete after hardening is ≥2.5MPa;

[0057] After the concrete hardens, it is watered and maintained. 20m 3 The water tank is used as maintenance water. After watering maintenance is completed, film covering maintenance is adopted when the temperature is between 15 and 35°C. Insulating quilts are laid on the concrete surface when the temperature is between -5 and 14°C. After the concrete is poured, film sealing is adopted to form a water-retaining film. The maintenance period is 28 to 35 days.

[0058] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0059] The present invention improves the structural accuracy and durability through foundation surface treatment, protective layer treatment, optimized formwork reinforcement and steel bar protective layer control methods; effectively suppresses the internal temperature rise of concrete and reduces the risk of cracks through precooling of temperature control materials, layered pouring and dynamic cooling; adopts integrated maintenance measures to ensure uniform development of concrete strength and reduce quality risks. In view of the high scrap rate of formwork, the formwork is adaptively processed so that after pouring concrete, the formwork can be adjusted as the state of concrete changes, compensate for thermal expansion deformation, facilitate concrete demoulding, reduce formwork damage, and improve formwork reuse rate. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with Examples. The illustrative embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention. If specific conditions are not specified in the examples, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0061] The following is a detailed explanation using a pump station water conservancy as an example.

[0062] A large-volume pump station construction method comprises the following steps:

[0063] S1. Concrete mixing performance and entry strength analysis: Calculate the entry strength and concrete mixing capacity.

[0064] In some embodiments of the present invention, step S1 comprises the following steps:

[0065] S11. Calculate the warehousing strength according to the following formula:

[0066] Qm=Qj*m*n*K 1 *K 2 *K 3 *K 4

[0067] in,

[0068] Qm is the practical productivity, m 3 / moon;

[0069] Qj technical productivity, m 3 / h;

[0070] m is the number of working days per month, which is 25 days;

[0071] n is the decimal number of hours worked per day, which is 17 hours;

[0072] K1 is the working condition (hoisting debris) coefficient, which is 0.8;

[0073] K2 is the time utilization coefficient, which is 0.85;

[0074] K3 is the productivity utilization coefficient, which is taken as 0.85;

[0075] K4 is the utilization coefficient of multiple mechanical equipment, which is taken as 0.9.

[0076] S12. Calculate the concrete production capacity based on the warehouse strength. According to the overall schedule, the total amount of concrete pouring for this project is about 227,000 m 3 , the maximum monthly intensity is 19,000 m 3 / month, which occurred in October 2019, is calculated according to the following formula:

[0077]

[0078] in,

[0079] P is the theoretical hourly capacity of the concrete production system, m 3 / h;

[0080] Q m is the practical productivity, m 3 / moon;

[0081] M is the average number of effective working days per month, days / month;

[0082] N is the effective working time per day, hours / day;

[0083] Kh is the safety factor, which is 1.5.

[0084] The production scale of the concrete production system is calculated to be 79m 3 / h<90m 3 / h (production capacity of a single mixing station), meeting the actual production requirements on site.

[0085] S2. Auxiliary construction preparation: prepare wind, water and electricity equipment and facilities for construction, and arrange construction roads and pedestrian walkways.

[0086] Construction wind: Since the wind used in concrete pouring construction is relatively small, mainly for concrete foundation construction and roughening, it is planned to use two 6m 3 Mobile air compressor supply air.

[0087] Construction water: According to the large-volume concrete pouring construction site, it is initially planned to arrange a 10m 3 The water tank is used to supply water for cleaning the concrete foundation surface and for concrete maintenance. 10m 3 The water tank is replenished with a 10t sprinkler truck.

[0088] Construction power: Based on the load of large-volume concrete electrical machinery construction equipment and combined with the overall concrete construction considerations, it is initially planned to arrange three 400kVA transformers on the right bank of the pump station as power for concrete construction and drainage construction.

[0089] According to the peak power consumption of concrete: 3 6012 tower cranes (45kW) + construction drainage (8 35kW sewage pumps) + construction lighting (10kW) + vibration power (1kW) + other construction power (576kW), a total of 486KW, 2 400kVA transformers fully meet the construction power consumption. At the same time, a 400kw generator is configured as a backup power supply for concrete construction in the pump station.

[0090] S3. Foundation surface treatment: Excavate the foundation surface, remove scum, mud and dirt, make the concrete base surface clean, and free of loose debris, fragments, harmful substances and stagnant water on the surface. Vibrate and compact the loose parts of the soil foundation.

[0091] S4. Protective layer treatment: pour concrete cushion layer on the cleaned foundation surface, pour concrete for leveling, and implant supporting steel bars.

[0092] In some embodiments of the present invention, the above step S4 includes:

[0093] S41. Pour a 5 to 15 cm thick concrete cushion layer on the cleaned foundation surface and let it dry.

[0094] For the over-excavation of the bottom plate, concrete is poured first to level it, ensuring that the bottom steel bar protection layer of the bottom plate meets the requirements of the specification. Specifically, the bottom plate tooth groove slope protection layer is leveled by spraying concrete, and the construction site with large over-excavation is leveled by mold spraying

[0095] S42. Implant supporting steel bars, with the supporting steel bars entering the rock 15 to 25 cm.

[0096] The supporting steel bars are constructed manually with electric drills. For the special-section steel bars of the inlet and outlet flow channels of the pump station, in order to ensure the processing size and installation accuracy of different sections, the steel bars are laid out before processing, and each steel bar is processed according to the large sample. At the same time, additional sleeves and forming frames for bending special-shaped steel bars are added to the steel bar bending machine. According to the required bending arc, the steel sleeve of the corresponding size is selected. For steel bar joints with a diameter of 16 to 40 mm, mechanical connection is mostly adopted. When a straight thread connection is adopted, the length of the straight thread of the two connected steel bars screwed into the sleeve should be equal. For some steel bars that cannot be mechanically connected, lap welding is adopted. The lap length of double-sided welding is 5d, and the lap length of single-sided welding is 10d. The weld is required to be full and the welding slag is removed cleanly. The processed steel bars are transported to the construction site by a 15t flatbed truck.

[0097] S5. Formwork installation: Apply adaptive coating on the surface of memory alloy, dry it, heat it and apply pre-pressure, then make the formwork, use pre-buried steel bars as fixing points for formwork reinforcement, set anchor bars around the bottom of the formwork at the back to prevent slipping, install the formwork, and use double-sided tape to seal the contact surface between the formwork and concrete, as well as the joints between each formwork.

[0098] The above step S5 comprises:

[0099] S51. Modify the carbon nanotubes with a coupling agent, add them together with conductive carbon black into N-methylpyrrolidone, mix them evenly, add polyurethane emulsion, and disperse them evenly to obtain an adaptive coating.

[0100] The multi-walled carbon nanotubes are acidified to increase the surface carboxyl (-COOH) density, and then the multi-walled carbon nanotubes are coupled with amino groups to enhance the interfacial bonding force with the polyurethane matrix, which is convenient for subsequent treatment; the obtained adaptive coating has a low friction coefficient, which is convenient for subsequent cement demoulding.

[0101] The above-mentioned carbon nanotube coupling agent modification is specifically to treat the multi-walled carbon nanotubes with an acid solution by ultrasonic treatment, then add an ethanol solution of the coupling agent, and reflux for 3 to 4 hours at 55 to 65° C., wherein the acid solution includes a concentrated HNO solution with a volume ratio of (2.5 to 3.5): 1 3 and H 2 SO 4The ultrasonic treatment is specifically 75-85° C. for 100-150 min; the coupling agent is a silane coupling agent, preferably KH550, and the coupling agent concentration is 5-10%.

[0102] The above-mentioned polyurethane emulsion: carbon nanotube: silane coupling agent: conductive carbon black: N-methylpyrrolidone (mass ratio) = 75-80: 8-12: 1.8-2.3: 3-5: 5-12.5.

[0103] S52, spraying the adaptive coating on the surface of the Ni-Ti-Cu alloy, applying an electric field to induce, and then drying to obtain an adaptive material.

[0104] The Ni-Ti-Cu alloy contains 50-54% nickel, 43-48% titanium and the remainder copper.

[0105] The surface of the Ni-Ti-Cu alloy was roughened, cleaned, and then sprayed with adaptive coating, with a film layer of 80-104 μm, and allowed to stand for 5-10 minutes. 2 , electric field induction at 35-40℃ for 10-14min, and then gradient drying and curing.

[0106] Roughening treatment can improve the adhesion of the alloy surface. After spraying the coating, electric field induction can physically regulate the microscopic arrangement direction of carbon nanotubes (CNTs) to achieve intelligent response of the coating's macroscopic performance. Specifically, by switching the direction of the electric field (voltage reversal), the CNTs are arranged axially to form a graphene-like layered slip surface, which greatly reduces friction and improves the demolding effect.

[0107] Roughening can be done by sandblasting, sandpapering or other methods.

[0108] Gradient drying and curing includes curing at 75-83° C. for 30-60 minutes, curing at 120-140° C. for 60-120 minutes, and finally vacuum annealing at 50-60° C. Gradient drying and curing can eliminate internal stress.

[0109] S53. Heat the adaptive material to 35±2℃ and apply pre-pressure to make the adaptive material shrink to 88-93% of the designed curvature. Make a formwork and remove impurities on the surface of the formwork. Use the embedded steel bars as the fixing points for the formwork reinforcement. Set anchor bars around the bottom of the formwork at the back to prevent slipping. Install the formwork. Use double-sided tape to seal the contact surface between the formwork and concrete, as well as the joints between each formwork.

[0110] Heating ensures that SMA is completely transformed into the austenite phase (high elastic state) to facilitate plastic deformation. By applying prestress, the martensitic phase transformation can be induced to shrink the material. After pre-deformation, the formwork is in a metastable state, providing deformation space for subsequent adaptive adjustment, so that it can better adapt to the lateral pressure of concrete during the subsequent pouring process and prepare for adaptive adjustment.

[0111] The above-mentioned pre-pressure is 8 to 12 MPa.

[0112] The bottom plate template adopts a flat template, 1200×1500mm;

[0113] Inlet gate and control gate templates: The flat part of the gate pier uses the bottom plate flat template, and the size of the flat template is mainly 1200×1500mm, and 90cm×150cm and 60cm×150m are used as adjustment templates.

[0114] The outer perimeter of the bottom plate formwork is surrounded by steel pipe purlins in the horizontal direction (the initial spacing is 50-70cm) and 10# channel steel back side in the vertical direction (the initial spacing is 70-80cm). At the same time, in the process of pouring the bottom plate cushion layer, pre-buried anchor bars are used as the fixing points of the template reinforcement (according to the force analysis, the depth is 2-8cm in the bedrock), and the spacing of Φ14 steel bars (reinforcements) is 0.75×0.6m. Anchor bars are set at the back side around the bottom to prevent sliding.

[0115] S6. Embedded parts construction: Install the first-phase embedded parts and second-phase embedded parts, electromechanical equipment grounding system and auxiliary equipment pipelines at the construction location.

[0116] The construction location includes the gate piers, station body and forebay of the pump station.

[0117] The installation of the first-phase inserted bars and the second-phase embedded parts shall be strictly carried out in accordance with the specifications DL / T5018, DL / 5019, GB8564 and GB50205. The first-phase embedded parts (inserted bars) are metal, and the embedding is carried out simultaneously with the concrete engineering. Before installing the embedded parts, check whether the installation marks of each component at the joint belong to the embedded parts of the same hole. All embedded parts that do not belong to the same hole shall be classified and placed as required. The stability of the structure and no permanent deformation shall be ensured during the installation process. The connection joints of the embedded parts shall be connected only after inspection and qualification in accordance with the provisions of the construction drawings. At the joints where welding and bolts are used together, the installation shall be carried out according to the principle of "bolting first and welding later". After the concrete pouring and demolding, the embedded parts shall be re-measured, and the remaining steel bar heads and contaminants shall be removed, and the out-of-tolerance parts of the embedded concrete shall be processed. The installation of pipelines at the concrete joints requires the installation of joint sleeves according to the requirements of the drawings. During the pouring process, a dedicated installation person shall monitor the warehouse to prevent the displacement of embedded parts due to vibration.

[0118] After the second-phase embedded parts are adjusted in place, they must be welded to the reserved dowel bars or anchor bolts in the first-phase concrete. Avoid welding the reinforcement materials directly on the working surfaces such as the main rail, counter rail, side rail, or on the main components such as the water seal seat plate. After the embedded parts are installed, clean all the working surfaces, remove the exposed objects in the gate slot that affect the safe operation of the gate, remove the cement slurry on the surface of the stainless steel water seal seat plate, and re-measure the final installation accuracy of the embedded parts.

[0119] S7. Waterstop construction: After the embedded parts are installed, pour the concrete base, put in the waterstop sheet, and install the waterstop copper sheet and rubber waterstop strip at the construction gap to ensure that the groove position is consistent with the expansion joint position. After cleaning the surface impurities, pour the concrete and vibrate it to make it dense.

[0120] In some embodiments of the present invention, step S7 includes:

[0121] S71. After the embedded parts are installed, pour the concrete base. After the concrete solidifies for 7 days, put in the water stop plate so that it is 20 to 30 cm higher than the concrete base. Install the water stop copper plate at the construction gap to ensure that the groove is consistent with the expansion joint position.

[0122] The water stop installed in the expansion joint of the silo adopts a whole piece of special water stop large template. After the formwork is erected, the water stop or grout stop is set at the predetermined position and fixed with angle steel to prevent displacement due to concrete unloading or vibration. When pouring concrete, remove the large-diameter aggregate in the concrete around the water stop and ensure the quality of concrete pouring and vibration.

[0123] S72. Connect the rubber waterstop with the copper waterstop, clean the impurities on the surface of the waterstop, copper waterstop and rubber waterstop, and finally pour the concrete and vibrate it to make it dense.

[0124] In some embodiments of the present invention, the rubber waterstop strip and the copper waterstop sheet are connected by riveting.

[0125] The above-mentioned rubber waterstop joints are connected by vulcanization, the tensile strength of the joints is greater than 75% of the strength of the parent material, and the overlap length between the rubber waterstop pieces is greater than 10 cm.

[0126] During pouring, use a soft-shaft vibrator to vibrate the lower part of the waterstop carefully to ensure that the waterstop is tightly bonded to the surrounding concrete. Pay special attention to the close bonding of the concrete under the horizontal waterstop and vibrate it densely to prevent honeycombs, dog holes and folding of the waterstop. Ensure that the covering thickness of the concrete is greater than 30cm after closing.

[0127] S8. Concrete pouring: After the water-stopping construction, first lay a layer of cement mortar, pour the concrete in layers, vibrate the concrete, solidify it, and remove the formwork.

[0128] When pouring concrete, the concrete will apply pressure to the side of the formwork. When the pressure increases, the formwork will undergo phase change expansion. Then, when the concrete is finally set, the temperature will rise to about 32°C, and the formwork will phase change and shrink, returning to its original shape, thus achieving lossless demolding.

[0129] In some embodiments of the present invention, the cement mortar has a thickness of 4 to 8 cm and has the same strength grade as concrete.

[0130] In some embodiments of the present invention, the above-mentioned layered concrete pouring has a thickness of 30 to 50 cm for each layer, a front-to-back distance of 2 to 5 m between the upper and lower layers, and the joints of the same layer are fully vibrated. When pouring concrete on a sloped base, start from a low point and increase layer by layer to maintain horizontal stratification.

[0131] During the above concrete pouring process, timely remove the mortar adhering to the formwork, steel bars, water stop plates and embedded parts. When there is too much water seepage on the concrete surface, timely measures should be taken to drain the water in the bin without taking away the mortar. The concrete surface should be leveled, compacted and finished to prevent loose tops and shrinkage cracks. During the pouring process, the position of the steel bars, the thickness of the protective layer and the position accuracy of all embedded parts should be checked frequently, and at the same time, the concrete should be ensured to rise evenly. When pouring concrete on an inclined surface, start from the lowest point until the horizontal surface is maintained. The concrete is put into the bin with a string tube and vibrated with an inserted vibrator. Strictly control the pouring speed and pay attention to and monitor the settlement of the concrete formwork in a timely manner.

[0132] The above-mentioned vibration should be inserted into the next layer 4 to 8 cm when vibrating the upper layer to eliminate the joint between the two layers, and the upper concrete should be vibrated before the lower concrete begins to set. During the vibration process, the vibrating rod should be pulled up and down to make the upper and lower concretes vibrated evenly and densely. Preferably, the vibration is carried out in a "fast insertion and slow withdrawal" manner. The standards for concrete vibration are based on the concrete surface no longer sinking significantly, no bubbles appearing, and mortar oozing out of the surface. The vibration method of the flat vibrator is to drag and move slowly flatly, and the concrete surface is vibrated flat and slurry is oozing out, no bubbles appearing, and no sinking is qualified. It is strictly forbidden to vibrate the concrete that has already set again to prevent the concrete from cracking. If the pouring is interrupted due to special circumstances, the interruption time does not exceed the initial setting time, and the pouring can continue.

[0133] In some embodiments of the present invention, during the above-mentioned vibration process, the vibration time of each insertion point is 20 to 30 seconds. If it is too short, it is difficult to vibrate densely, and if it is too long, concrete segregation may occur.

[0134] In some embodiments of the present invention, after the poured concrete layer reaches a compressive strength of 1.5 MPa or more, the next layer is poured.

[0135] In some embodiments of the present invention, the total thickness of the casting layer is 1.0-2m, the step width is 1.0-1.5m, and the slope is not greater than 1:2.

[0136] S9. Concrete curing: After the concrete hardens, it is cured and covered with materials to keep the temperature difference between the inside and outside of the concrete within 0 to 20°C.

[0137] In some embodiments of the present invention, the strength of the concrete after hardening is ≥2.5MPa.

[0138] In some embodiments of the present invention, the concrete is watered after hardening, and 20m 3 The water tank is used as maintenance water. After watering maintenance is completed, film covering maintenance is adopted when the temperature is between 15 and 35°C. Insulating quilts are laid on the concrete surface when the temperature is between -5 and 14°C. After the concrete is poured, film sealing is adopted to form a water-retaining film. The maintenance period is 28 to 35 days.

[0139] Example 1

[0140] A large-volume pump station construction method comprises the following steps:

[0141] S1. Concrete mixing performance and entry strength analysis: Calculate the entry strength and concrete mixing capacity.

[0142] S11. Calculate the warehousing strength according to the following formula:

[0143] Qm=Qj*m*n*K 1 *K 2 *K 3 *K 4 ;

[0144] S12. Calculate the concrete production capacity based on the warehouse strength, specifically according to the following formula:

[0145]

[0146] in,

[0147] Q m is the practical productivity, m 3 / moon;

[0148] Qj technical productivity, m 3 / h;

[0149] m is the number of working days per month, which is 25 days;

[0150] n is the decimal number of hours worked per day, which is 17 hours;

[0151] K1 is the working condition (hoisting debris) coefficient, which is 0.8;

[0152] K2 is the time utilization coefficient, which is 0.85;

[0153] K3 is the productivity utilization coefficient, which is taken as 0.85;

[0154] K4 is the utilization coefficient of multiple mechanical equipment, which is 0.9;

[0155] P is the theoretical hourly capacity of the concrete production system, m 3 / h;

[0156] M is the average number of effective working days per month, days / month;

[0157] N is the effective working time per day, hours / day;

[0158] Kh is the safety factor, which is 1.5.

[0159] S2. Auxiliary construction preparation: prepare wind, water and electricity equipment and facilities for construction, and arrange construction roads and pedestrian walkways.

[0160] S3. Foundation surface treatment: Excavate the foundation surface, remove scum, mud and dirt, make the concrete base surface clean, and free of loose debris, fragments, harmful substances and stagnant water on the surface. Vibrate and compact the loose parts of the soil foundation.

[0161] S4. Protective layer treatment: pour concrete cushion layer on the cleaned foundation surface, pour concrete for leveling, and implant supporting steel bars.

[0162] S41. Pour a 10 cm thick concrete cushion layer on the cleaned foundation surface and dry it;

[0163] S42. Implant supporting steel bars, with the supporting steel bars entering the rock 15 cm deep.

[0164] S5. Formwork installation: Apply adaptive coating on the surface of memory alloy, dry it, heat it and apply pre-pressure, then make the formwork, use pre-buried steel bars as fixing points for formwork reinforcement, set anchor bars around the bottom of the formwork at the back to prevent slipping, install the formwork, and use double-sided tape to seal the contact surface between the formwork and concrete, as well as the joints between each formwork.

[0165] S51, carbon nanotubes were treated with concentrated HNO in a volume ratio of 2.5:1 3 and H 2 SO 4Ultrasonic treatment was performed at 75°C for 100 min, and a 5% coupling agent ethanol solution was refluxed at 55°C for 3 h, and then added to N-methylpyrrolidone together with conductive carbon black, mixed evenly, and polyurethane emulsion was added and evenly dispersed to obtain an adaptive coating, wherein the polyurethane emulsion: carbon nanotube: silane coupling agent: conductive carbon black: N-methylpyrrolidone (mass ratio) = 75:8:1.8:3:12.2;

[0166] S52, spray the Ni-Ti-Cu alloy surface with adaptive coating to form a film layer of 80-104 μm, let it stand for 5 minutes, and then 2 , electric field induction at 35°C for 10 minutes, gradient drying and curing, curing at 75°C for 30 minutes, curing at 120°C for 60 minutes, and finally vacuum annealing at 50°C to obtain the adaptive material;

[0167] S53. Heat the adaptive material to 35±2℃ and apply pre-pressure to make the adaptive material shrink to 88% of the designed curvature. Make a formwork and remove impurities on the surface of the formwork. Use the embedded steel bars as the fixing points for the formwork reinforcement. Set anchor bars around the bottom of the formwork at the back to prevent slipping. Install the formwork. Use double-sided tape to seal the contact surface between the formwork and concrete, as well as the joints between each formwork.

[0168] S6. Embedded parts construction: Install the first-phase embedded parts and second-phase embedded parts, electromechanical equipment grounding system and auxiliary equipment pipelines at the construction location.

[0169] S7. Waterstop construction: After the embedded parts are installed, pour the concrete base, put in the waterstop sheet, and install the waterstop copper sheet and rubber waterstop strip at the construction gap to ensure that the groove position is consistent with the expansion joint position. After cleaning the surface impurities, pour the concrete and vibrate it to make it dense.

[0170] S71. After the embedded parts are installed, the concrete base is poured. After the age of the solidified concrete reaches 7 days, the water stop is placed so that the water stop is 20 cm higher than the concrete base. The water stop copper sheet is installed at the construction gap to ensure that the groove is consistent with the expansion joint position;

[0171] S72, connecting the rubber waterstop with the copper waterstop sheet, cleaning the impurities on the surface of the waterstop sheet, the copper waterstop sheet and the rubber waterstop, and finally pouring concrete and vibrating it to make it dense, wherein the rubber waterstop and the copper waterstop are connected by riveting.

[0172] S8. Concrete pouring: After the water stop construction, first lay a layer of cement mortar with a thickness of 4cm, and pour concrete in layers. The thickness of each layer is 30cm. The distance between the upper and lower layers is 2m. The joints of the same layer are fully vibrated. When pouring concrete on the slope base, start from the bottom and rise layer by layer. Keep the horizontal layers and vibrate the concrete. When vibrating the upper layer, insert 4cm into the next layer. Vibrate the upper layer of concrete before the lower layer begins to set. During the vibration process, the vibration time of each insertion point is 20s. The total thickness of the poured layer is 1.0m, the step width is 1.0m, and the slope is not greater than 1:2. After the poured concrete layer reaches 1.5Mpa, continue to pour the next layer and solidify.

[0173] S9. Concrete curing: After the concrete hardens, it is cured by sprinkling water. Set 20m on both sides of the foundation pit. 3 The water tank is used as maintenance water. After watering maintenance is completed, film covering maintenance is adopted when the temperature is between 15 and 35°C. Insulating quilts are laid on the concrete surface when the temperature is between -5 and 14°C. After the concrete is poured, film sealing is adopted to form a water-retaining film. The maintenance period is 28 days.

[0174] The template was subjected to a friction and wear test, and the friction coefficient of the template was found to be 0.18.

[0175] After observing the dismantled formwork, it was found that the dismantled formwork can be reused.

[0176] Example 2

[0177] A large-volume pump station construction method comprises the following steps:

[0178] S1. Concrete mixing performance and entry strength analysis: Calculate the entry strength and concrete mixing capacity.

[0179] S11. Calculate the warehousing strength according to the following formula:

[0180] Qm=Qj*m*n*K 1 *K 2 *K 3 *K 4 ;

[0181] S12. Calculate the concrete production capacity based on the warehouse strength, specifically according to the following formula:

[0182]

[0183] in,

[0184] Q m is the practical productivity, m 3 / moon;

[0185] Qj technical productivity, m3 / h;

[0186] m is the number of working days per month, which is 25 days;

[0187] n is the decimal number of hours worked per day, which is 17 hours;

[0188] K1 is the working condition (hoisting debris) coefficient, which is 0.8;

[0189] K2 is the time utilization coefficient, which is 0.85;

[0190] K3 is the productivity utilization coefficient, which is taken as 0.85;

[0191] K4 is the utilization coefficient of multiple mechanical equipment, which is 0.9;

[0192] P is the theoretical hourly capacity of the concrete production system, m 3 / h;

[0193] M is the average number of effective working days per month, days / month;

[0194] N is the effective working time per day, hours / day;

[0195] Kh is the safety factor, which is 1.5.

[0196] S2. Auxiliary construction preparation: prepare wind, water and electricity equipment and facilities for construction, and arrange construction roads and pedestrian walkways.

[0197] S3. Foundation surface treatment: Excavate the foundation surface, remove scum, mud and dirt, make the concrete base surface clean, and free of loose debris, fragments, harmful substances and stagnant water on the surface. Vibrate and compact the loose parts of the soil foundation.

[0198] S4. Protective layer treatment: pour concrete cushion layer on the cleaned foundation surface, pour concrete for leveling, and implant supporting steel bars.

[0199] S41. Pour a 15 cm thick concrete cushion layer on the cleaned foundation surface and dry it;

[0200] S42. Implant supporting steel bars, with the supporting steel bars entering the rock 20 cm deep.

[0201] S5. Formwork installation: Apply adaptive coating on the surface of memory alloy, dry it, heat it and apply pre-pressure, then make the formwork, use pre-buried steel bars as fixing points for formwork reinforcement, set anchor bars around the bottom of the formwork at the back to prevent slipping, install the formwork, and use double-sided tape to seal the contact surface between the formwork and concrete, as well as the joints between each formwork.

[0202] S51, carbon nanotubes were treated with concentrated HNO in a volume ratio of 3:1 3 and H 2SO 4 Ultrasonic treatment was performed at 80°C for 120 min, and an ethanol solution of a coupling agent with a concentration of 8% was refluxed at 60°C for 3.5 h, and then added to N-methylpyrrolidone together with conductive carbon black, mixed evenly, and polyurethane emulsion was added and evenly dispersed to obtain an adaptive coating, wherein the polyurethane emulsion: carbon nanotube: silane coupling agent: conductive carbon black: N-methylpyrrolidone (mass ratio) = 78:10:2:4:10;

[0203] S52, spray the Ni-Ti-Cu alloy surface with adaptive coating to form a film layer of 80-104μm, let it stand for 8min, and then 2 , electric field induction at 38°C for 12 minutes, gradient drying and curing, curing at 80°C for 45 minutes, curing at 130°C for 90 minutes, and finally vacuum annealing at 55°C to obtain the adaptive material;

[0204] S53. Heat the adaptive material to 35±2℃ and apply pre-pressure to make the adaptive material shrink to 88-93% of the designed curvature. Make a formwork and remove impurities on the surface of the formwork. Use the embedded steel bars as the fixing points for the formwork reinforcement. Set anchor bars around the bottom of the formwork at the back to prevent slipping. Install the formwork. Use double-sided tape to seal the contact surface between the formwork and concrete, as well as the joints between each formwork.

[0205] S6. Embedded parts construction: Install the first-phase embedded parts and second-phase embedded parts, electromechanical equipment grounding system and auxiliary equipment pipelines at the construction location.

[0206] S7. Waterstop construction: After the embedded parts are installed, pour the concrete base, put in the waterstop sheet, and install the waterstop copper sheet and rubber waterstop strip at the construction gap to ensure that the groove position is consistent with the expansion joint position. After cleaning the surface impurities, pour the concrete and vibrate it to make it dense.

[0207] S71. After the embedded parts are installed, the concrete base is poured. After the age of the solidified concrete reaches 7 days, the water stop is placed so that the water stop is 5 cm higher than the concrete base, and the water stop copper sheet is installed at the construction gap to ensure that the groove is consistent with the expansion joint position;

[0208] S72, connecting the rubber waterstop with the copper waterstop sheet, cleaning the impurities on the surface of the waterstop sheet, the copper waterstop sheet and the rubber waterstop, and finally pouring concrete and vibrating it to make it dense, wherein the rubber waterstop and the copper waterstop are connected by riveting.

[0209] S8. Concrete pouring: After the water stop construction, first lay a layer of cement mortar with a thickness of 6cm, and pour concrete in layers. The thickness of each layer is 40cm. The distance between the upper and lower layers is 3m. The joints of the same layer are fully vibrated. When pouring concrete on the slope base, start from the bottom and rise layer by layer. Keep the horizontal layers and vibrate the concrete. When vibrating the upper layer, insert 5cm into the next layer. Vibrate the upper layer of concrete before the lower layer begins to set. During the vibration process, the vibration time of each insertion point is 25s. The total thickness of the poured layer is 1.5m, the step width is 1.5m, and the slope is not greater than 1:2. After the poured concrete layer reaches 1.5Mpa, continue to pour the next layer and solidify.

[0210] S9. Concrete curing: After the concrete hardens, it is cured by sprinkling water. Set 20m on both sides of the foundation pit. 3 The water tank is used as maintenance water. After watering maintenance is completed, film covering maintenance is adopted when the temperature is between 15 and 35°C. Insulating quilts are laid on the concrete surface when the temperature is between -5 and 14°C. After the concrete is poured, film sealing is adopted to form a water-retaining film. The maintenance period is 32 days.

[0211] The template was subjected to a friction and wear test, and the friction coefficient of the template was found to be 0.12.

[0212] After observing the dismantled formwork, it was found that the dismantled formwork can be reused.

[0213] Example 3

[0214] A large-volume pump station construction method comprises the following steps:

[0215] S1. Concrete mixing performance and entry strength analysis: Calculate the entry strength and concrete mixing capacity.

[0216] S11. Calculate the warehousing strength according to the following formula:

[0217] Qm=Qj*m*n*K 1 *K 2 *K 3 *K 4 ;

[0218] S12. Calculate the concrete production capacity based on the warehouse strength, specifically according to the following formula:

[0219]

[0220] in,

[0221] Q m is the practical productivity, m 3 / moon;

[0222] Qj technical productivity, m3 / h;

[0223] m is the number of working days per month, which is 25 days;

[0224] n is the decimal number of hours worked per day, which is 17 hours;

[0225] K1 is the working condition (hoisting debris) coefficient, which is 0.8;

[0226] K2 is the time utilization coefficient, which is 0.85;

[0227] K3 is the productivity utilization coefficient, which is taken as 0.85;

[0228] K4 is the utilization coefficient of multiple mechanical equipment, which is 0.9;

[0229] P is the theoretical hourly capacity of the concrete production system, m 3 / h;

[0230] M is the average number of effective working days per month, days / month;

[0231] N is the effective working time per day, hours / day;

[0232] Kh is the safety factor, which is 1.5.

[0233] S2. Auxiliary construction preparation: prepare wind, water and electricity equipment and facilities for construction, and arrange construction roads and pedestrian walkways.

[0234] S3. Foundation surface treatment: Excavate the foundation surface, remove scum, mud and dirt, make the concrete base surface clean, and free of loose debris, fragments, harmful substances and stagnant water on the surface. Vibrate and compact the loose parts of the soil foundation.

[0235] S4. Protective layer treatment: pour concrete cushion layer on the cleaned foundation surface, pour concrete for leveling, and implant supporting steel bars.

[0236] S41. Pour a 15 cm thick concrete cushion layer on the cleaned foundation surface and dry it;

[0237] S42. Implant supporting steel bars, with the supporting steel bars entering the rock 25 cm deep.

[0238] S5. Formwork installation: Apply adaptive coating on the surface of memory alloy, dry it, heat it and apply pre-pressure, then make the formwork, use pre-buried steel bars as fixing points for formwork reinforcement, set anchor bars around the bottom of the formwork at the back to prevent slipping, install the formwork, and use double-sided tape to seal the contact surface between the formwork and concrete, as well as the joints between each formwork.

[0239] S51, carbon nanotubes were treated with concentrated HNO in a volume ratio of 3.5:1 3 and H2 SO 4 Ultrasonic treatment was performed at 85°C for 150 min, and a 10% coupling agent ethanol solution was refluxed at 65°C for 4 h, and then added to N-methylpyrrolidone together with conductive carbon black, mixed evenly, and polyurethane emulsion was added and evenly dispersed to obtain an adaptive coating, wherein the polyurethane emulsion: carbon nanotube: silane coupling agent: conductive carbon black: N-methylpyrrolidone (mass ratio) = 80:8:1.8:3:8.2;

[0240] S52, spray the Ni-Ti-Cu alloy surface with adaptive coating to form a film layer of 80-104μm, let it stand for 10min, and then 2 , electric field induction at 40°C for 14 minutes, gradient drying and curing, curing at 75-83°C for 60 minutes, curing at 140°C for 120 minutes, and finally vacuum annealing at 60°C to obtain the adaptive material;

[0241] S53. Heat the adaptive material to 35±2℃ and apply pre-pressure to make the adaptive material shrink to 88-93% of the designed curvature. Make a formwork and remove impurities on the surface of the formwork. Use the embedded steel bars as the fixing points for the formwork reinforcement. Set anchor bars around the bottom of the formwork at the back to prevent slipping. Install the formwork. Use double-sided tape to seal the contact surface between the formwork and concrete, as well as the joints between each formwork.

[0242] S6. Embedded parts construction: Install the first-phase embedded parts and second-phase embedded parts, electromechanical equipment grounding system and auxiliary equipment pipelines at the construction location.

[0243] S71. After the embedded parts are installed, the concrete base is poured. After the age of the solidified concrete reaches 7 days, the water stop is placed so that the water stop is 5 cm higher than the concrete base, and the water stop copper sheet is installed at the construction gap to ensure that the groove is consistent with the expansion joint position;

[0244] S72, connecting the rubber waterstop with the copper waterstop sheet, cleaning the impurities on the surface of the waterstop sheet, the copper waterstop sheet and the rubber waterstop, and finally pouring concrete and vibrating it to make it dense, wherein the rubber waterstop and the copper waterstop are connected by riveting.

[0245] S8. Concrete pouring: After the water stop construction, first lay a layer of cement mortar with a thickness of 6cm, and pour concrete in layers. The thickness of each layer is 40cm. The distance between the upper and lower layers is 3m. The joints of the same layer are fully vibrated. When pouring concrete on the slope base, start from the bottom and rise layer by layer. Keep the horizontal layers and vibrate the concrete. When vibrating the upper layer, insert 5cm into the next layer. Vibrate the upper layer of concrete before the lower layer begins to set. During the vibration process, the vibration time of each insertion point is 25s. The total thickness of the poured layer is 1.5m, the step width is 1.5m, and the slope is not greater than 1:2. After the poured concrete layer reaches 1.5Mpa, continue to pour the next layer and solidify.

[0246] S9. Concrete curing: After the concrete hardens, it is cured by sprinkling water. Set 20m on both sides of the foundation pit. 3 The water tank is used as maintenance water. After watering maintenance is completed, film covering maintenance is adopted when the temperature is between 15 and 35°C. Insulating quilts are laid on the concrete surface when the temperature is between -5 and 14°C. After the concrete is poured, film sealing is adopted to form a water-retaining film. The maintenance period is 32 days.

[0247] The template was subjected to a friction and wear test, and the friction coefficient of the template was found to be 0.15.

[0248] After observing the dismantled formwork, it was found that the dismantled formwork can be reused.

[0249] Comparative Example 1

[0250] This comparative example is basically the same as Example 1, except that no adaptive coating is applied.

[0251] The template was subjected to a friction and wear test, and the friction coefficient of the template was found to be 0.35.

[0252] Comparative Example 2

[0253] This comparative example is basically the same as Example 1, except that ordinary wooden templates are used to replace Ni-Ti-Cu alloy.

[0254] The template was subjected to a friction and wear test, and the friction coefficient of the template was found to be 0.48.

[0255] By observing the dismantled formwork, it was found that 18.3% of the dismantled wooden formwork was non-reusable.

[0256] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for constructing a large-volume pump station, characterized in that: The steps include: S1. Concrete mixing performance and entry strength analysis: Calculate the entry strength and concrete mixing capacity; S2. Construction auxiliary preparation: prepare wind, water and electricity equipment and facilities for construction, and arrange construction roads and pedestrian passages; S3. Foundation surface treatment: excavate the foundation surface, remove scum, sand and dirt, make the concrete base surface clean, and remove loose debris, debris, harmful substances and water on the surface. Vibrate and tamp the loose parts of the soil foundation; S4. Protective layer treatment: pour concrete cushion on the cleaned foundation surface, pour concrete for leveling, and implant supporting steel bars; S5. Formwork installation: Apply an adaptive coating on the surface of the memory alloy, dry it, heat it and apply pre-pressure, then make the formwork, use the embedded steel bars as the fixing points of the formwork reinforcement, set anchor bars around the bottom of the formwork at the back to prevent slipping, install the formwork, and use double-sided tape to seal the contact surface between the formwork and the concrete, as well as the joints of each formwork; S6. Embedded parts construction: install the first-phase embedded parts and second-phase embedded parts, electromechanical equipment grounding system and auxiliary equipment pipelines at the construction location; S7, Waterstop construction: After the embedded parts are installed, pour the concrete base, put in the waterstop sheet, and install the waterstop copper sheet and rubber waterstop strip at the construction gap, ensure that the groove is consistent with the expansion joint position, clean the surface impurities, and pour the concrete and vibrate it to make it dense; S8. Concrete pouring: After the water-stopping construction, first lay a layer of cement mortar, pour concrete in layers, and vibrate and solidify the concrete; S9. Concrete curing: After the concrete hardens, it is cured and covered with materials to keep the temperature difference between the inside and outside of the concrete within 0 to 20°C.

2. A large-volume pump station construction method according to claim 1, characterized in that: The step S1 comprises the following steps: S11. Calculate the warehousing strength according to the following formula: Qm=Qj*m*n*K1*K2*K3*K4; S12. Calculate the concrete production capacity based on the warehouse strength, specifically according to the following formula: in, Q m is the practical productivity, m 3 / moon; Qj technical productivity, m 3 / h; m is the number of working days per month, which is 25 days; n is the decimal number of hours worked per day, which is 17 hours; K1 is the working condition (hoisting debris) coefficient, which is 0.8; K2 is the time utilization coefficient, which is 0.85; K3 is the productivity utilization coefficient, which is taken as 0.85; K4 is the utilization coefficient of multiple mechanical equipment, which is 0.9; P is the theoretical hourly capacity of the concrete production system, m 3 / h; M is the average number of effective working days per month, days / month; N is the effective working time per day, hours / day; Kh is the safety factor, which is 1.

5.

3. A large-volume pump station construction method according to claim 1, characterized in that: The step S4 comprises: S41. Pour a 5-15 cm thick concrete cushion layer on the cleaned foundation surface and dry it; S42. Implant supporting steel bars, with the supporting steel bars entering the rock 15 to 25 cm.

4. A large-volume pump station construction method according to claim 1, characterized in that: The construction location includes the gate piers, station body and front pool of the pump station.

5. A large-volume pump station construction method according to claim 1, characterized in that: The step S5 comprises: S51, modifying the carbon nanotubes with a coupling agent, adding the carbon nanotubes together with the conductive carbon black into N-methylpyrrolidone, mixing evenly, adding the polyurethane emulsion, and dispersing evenly to obtain an adaptive coating; S52, spraying an adaptive coating on the surface of the Ni-Ti-Cu alloy, applying an electric field to induce, and then drying to obtain an adaptive material; S53. Heat the adaptive material to 35±2℃ and apply pre-pressure to make the adaptive material shrink to 88-93% of the designed curvature. Make a formwork and remove impurities on the surface of the formwork. Use the embedded steel bars as the fixing points for the formwork reinforcement. Set anchor bars around the bottom of the formwork at the back to prevent slipping. Install the formwork. Use double-sided tape to seal the contact surface between the formwork and concrete, as well as the joints between each formwork.

6. A method for constructing a large-volume pump station according to claim 5, characterized in that: The carbon nanotube coupling agent modification is specifically to ultrasonically treat the multi-walled carbon nanotubes with an acid solution, then add an ethanol solution of the coupling agent, and reflux for 3 to 4 hours at 55 to 65° C., wherein the acid solution includes concentrated HNO3 and H2SO4 in a volume ratio of (2.5 to 3.5):1, and the ultrasonic treatment is specifically 75 to 85° C. for 100 to 150 minutes; the coupling agent is a silane coupling agent, and the volume concentration of the coupling agent is 5 to 10%; The Ni-Ti-Cu alloy surface is roughened, cleaned, and then sprayed with adaptive coating, spraying a film layer of 80-104 μm, standing for 5-10 minutes, and at a voltage of 300 V / mm and 0.1-0.3 mA / cm 2 , electric field induction at 35-40°C for 10-14 minutes, and then gradient drying and curing; The pre-pressure is 8-12 MPa.

7. A large-volume pump station construction method according to claim 1, characterized in that: The step S7 comprises: S71. After the embedded parts are installed, the concrete base is poured. After the age of the solidified concrete reaches 7 days, the water stop is placed so that the water stop is 20 to 30 cm higher than the concrete base. The water stop copper sheet is installed at the construction gap to ensure that the groove is consistent with the expansion joint position; S72, connecting the rubber water stop strip with the copper water stop sheet, cleaning the impurities on the surface of the water stop sheet, the copper water stop sheet and the rubber water stop strip, and finally pouring concrete and vibrating it to make it dense, wherein the rubber water stop strip and the copper water stop sheet are connected by riveting; The thickness of the cement mortar is 4 to 8 cm.

8. A large-volume pump station construction method according to claim 1, characterized in that: The layered concrete pouring has a thickness of 30 to 50 cm for each layer, a front-to-back distance of 2 to 5 m between the upper and lower layers, and joints of the same layer are fully vibrated. When pouring concrete on the slope base, start from the bottom and rise layer by layer to maintain horizontal stratification.

9. A large-volume pump station construction method according to claim 1, characterized in that: The vibrating concrete is specifically to be inserted into the next layer by 4 to 8 cm when vibrating the upper layer, and the upper layer of concrete is vibrated before the lower layer of concrete begins to set; During the vibration process, the vibration time of each insertion point is 20 to 30 seconds; The total thickness of the pouring layer is 1.0 to 2m, the step width is 1.0 to 1.5m, and the slope is not greater than 1:2; After the poured concrete layer reaches 1.5Mpa, continue pouring the next layer.

10. A method for constructing a large-volume pump station according to claim 1, characterized in that: The strength of the concrete after hardening is ≥2.5MPa; After the concrete hardens, it is watered and maintained. 20m 3 The water tank is used as maintenance water. After watering maintenance is completed, film covering maintenance is adopted when the temperature is between 15 and 35°C. Insulating quilts are laid on the concrete surface when the temperature is between -5 and 14°C. After the concrete is poured, film sealing is adopted to form a water-retaining film. The maintenance period is 28 to 35 days.

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