Construction process of water-filled prestressed bottom plate concrete and side wall temperature control anti-cracking anti-seepage

Abstract

The application discloses a construction process of water-filled prestressed bottom plate concrete and side wall temperature control anti-cracking anti-seepage, and relates to the technical field of building construction, and comprises the following steps: formwork design, pipe network, steel bar, water storage transfer tank preparation and installation, concrete pouring, internal circulation initial start, water storage heat preservation curing tank before concrete initial setting, three intercommunication operation of external circulation, surface circulation and internal circulation after concrete initial setting, mid-term concrete temperature control maintenance and monitoring acceptance and concrete internal drainage steam exhaust. The application aims at the defects of the current construction method of traditional bottom plate concrete and side wall concrete, utilizes bonded prestressed steel bars and common steel bars to resist temperature shrinkage deformation together in the bottom plate concrete, adopts PVC coated hose circulating pipe network in the non-post-cast strip area, adopts polyester fiber reinforced net+PVC coated hose as the support of the side mold to replace the traditional steel mesh, wood mold and other methods in the post-cast strip area, adopts multiple constraint anti-seepage technology, and effectively reduces the post-cast strip leakage risk.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building construction, in particular to a water-filled prestressed bottom plate concrete and side wall temperature control anti-cracking and anti-seepage construction process. BACKGROUND

[0002] In recent years, with the rapid development of high-rise buildings, the engineering structure type is becoming more and more complex, and most of the cast-in-place structures have large size, especially the basement concrete structure has problems such as cracks and waterproofing. In engineering practice, more than 80% of the cracks caused by temperature difference changes and concrete shrinkage are caused by structural deformation of the super-long basement bottom plate and side wall structure.

[0003] For the bottom plate concrete crack prevention measures, the current common methods are "leaving deformation joint", "combining post-pouring band", and "skip-parking method", and are supplemented by conventional covering maintenance and structural measures, mainly including whole layered continuous pouring or push-type continuous pouring, various insulation material covering insulation measures, setting structural reinforcement, setting sliding layer on the cushion, setting external restraint reduction measures, etc. However, these methods are time-consuming, labor-intensive and have little effect.

[0004] (1) For the basement concrete structure, leaving deformation joint will be one of the main sources of long-term seepage of the basement; setting deformation joint also increases the construction difficulty and the amount and cost of material components.

[0005] (2) The settlement post-pouring band penetrates the entire structure, and the settlement post-pouring band may cause beam and plate breakage at the through part, which brings inconvenience to construction; or the post-pouring band is dense in steel, such as using a formwork as a side mold support, the processing technology is complicated, the construction difficulty is great, and the construction forming effect is poor. Improper post-pouring band treatment will seriously affect the integrity and safety of the structure. Especially, the waterproof treatment of the post-pouring band of the basement structure has more stringent quality requirements, and improper treatment is easy to cause cracking, leakage and other phenomena, and a large amount of manpower and material resources are needed for repair and compensation in the later period.

[0006] (3) When the skip-parking method is constructed, according to the adjacent conditions of the concrete post-pouring block and the pre-pouring block, the more constraints, the smaller the shrinkage deformation that the concrete can release, and the more likely to appear cracks. If the skip-parking construction scheme is improper, the warehouse area is unreasonable, and the construction sequence organization is improper, it will cause irreparable engineering quality accidents.

[0007] (4) The various insulation material covering insulation measures have very complex maintenance procedures and are difficult to completely guarantee the maintenance conditions.

[0008] In view of the disadvantages of the above-mentioned traditional bottom plate concrete and side wall concrete construction methods, our company has improved the bottom plate concrete and side wall concrete temperature control anti-cracking and anti-seepage process. SUMMARY

[0009] The application aims to provide a water-filled prestressed bottom plate concrete and side wall temperature control anti-cracking and anti-seepage construction process to overcome the above-mentioned defects in the prior art.

[0010] A water-filled prestressed bottom plate concrete and side wall temperature control anti-cracking and anti-seepage construction process, comprising the following steps:

[0011] S1, template design: adopt double-layer polyester fiber reinforced net + PVC coated hose, wooden square and multi-layer board to perform circulating hose horizontal design and circulating hose vertical design;

[0012] S2, pipe network, steel bar, water storage and transfer pool preparation and installation: perform circulating hose construction including steel bar binding, polyester fiber reinforced net + PVC coated hose installation, PVC coated hose fixing and water filling, thermocouple sensor layout, and then perform water storage and transfer pool construction;

[0013] S3, concrete pouring and internal circulation initial start: before concrete pouring, connect the preset circulating pipe network and the water storage and transfer pool pipeline by using a special joint, and perform water circulation in the circulating pipe network system in advance; during concrete pouring, start the preset circulating pipe network, and run water in the circulating pipe network inside the concrete to take away part of the heat inside the bottom plate and bearing platform concrete in the initial pouring process, so that the circulating water is synchronously heated in the whole concrete pouring process;

[0014] S4, water storage and heat preservation curing pool before concrete initial setting: before concrete initial setting, make a water storage and heat preservation curing pool by using the brick formwork of the bottom plate peripheral guide wall, preset a small submersible pump in the water storage and heat preservation curing pool, timely discharge high-temperature water to the external circulation system, and at the same time, exchange low-temperature water to cool the circulating water by increasing water flow exchange amount;

[0015] S5, implement three-connection operation of external circulation, surface circulation and internal circulation after concrete initial setting: the internal circulation and surface circulation systems control the electric water pump by the concrete temperature monitoring system to implement whole-process synchronous circulating water exchange, the external circulation system controls the electric water pump by the recharge well monitoring system to automatically control the flow and speed of recharge water, and the external circulation and surface circulation systems control the electric water pump by the automatic float valve and intelligent temperature control instrument of the water storage and heat preservation curing pool on the bottom plate to implement whole-process automatic monitoring and synchronous circulating water exchange;

[0016] S6, medium-term concrete temperature control and monitoring and acceptance: after concrete final setting, first drain the water in the preset circulating water pipe, then pull out and remove the PVC coated hose, clean the polyester fiber reinforced net + PVC coated hose after removal with clean water, dry and reuse, inject water into the concrete circulating hole, and at the same time, make the water flow in the bottom plate concrete structure continue to flow into the whole water storage and heat preservation pool on the bottom plate, and perform curing on the bottom plate concrete inside and surface for no less than 14 days;

[0017] S7, the concrete internal hydrophobic steam exhaust: after the concrete curing for fourteen days, when the temperature difference between the inside and outside of the concrete is continuously less than the critical value of 25℃ for 3 days, the circulating water work can be stopped, the water in the bottom plate concrete hole is drained, the circulating curing water is introduced to the basement outer wall inside drainage ditch, and is drained to the nearby water collecting well. The bottom plate internal circulating pipeline and the bottom plate peripheral drainage ditch are communicated with the water collecting well to form the later stage hydrophobic steam exhaust system.

[0018] Preferably, the PVC coating hose in S1 has a wall thickness of 1.0 mm, a burst pressure of 0.6 Mpa, and a diameter of 50 mm, 80 mm or 100 mm; the wood square has a specification of 45×90 mm; and the multi-layer board has a thickness of 15 mm.

[0019] Preferably, the horizontal design of the circulating hose in S1 includes the following steps: the water filling hose in the non-post-cast strip area is arranged in a longitudinal and transverse horizontal manner with a spacing of less than or equal to 6m×6m; and the water filling hose in the post-cast strip area is arranged in a longitudinal direction along the two sides of the post-cast strip with a horizontal spacing of less than or equal to 0.8m, the water inlet is left on the top surface of the bottom plate or the pile cap, and the water outlet is left on the side surface of the pile cap or the post-cast strip.

[0020] Preferably, the vertical design of the circulating hose in S1 includes the following steps: in the non-post-cast strip area, when the plate thickness exceeds 400 mm, the number of polyester fiber reinforced mesh + PVC coating hose required is greater than or equal to three, and the double support bracket adopts Φ10@500; in the post-cast strip area of the superposed water stop, when the plate thickness is greater than or equal to 400 mm, the high polymer waterproof special-shaped sheet is laid on the upper part of the post-cast strip of the bottom plate, the lap joint is adopted to form a water filtering channel, the connection is penetrated at the intersection of the post-cast strip, and the water is drained to the nearby water collecting well in time, 3-4 PVC coating hoses are arranged in the post-cast strip of the expanded concrete, and the PVC coating hose is additionally provided with a Φ10@500 double bracket for reinforcement on both sides; in the post-cast strip area of the side wall, the high polymer protective drainage special-shaped sheet is fully laid between the double vertical steel bars, the laying sequence is from top to bottom, the additional steel bar is positioned and reinforced, the hollow drainage layer in the post-cast strip area of the side wall is connected with the hollow drainage layer in the post-cast strip area of the bottom plate at the corner, and the seepage water outside the wall flows downward into the drainage layer of the bottom plate and flows into the water collecting pit.

[0021] Preferably, the steel bar binding in S2 includes the following steps: the tensioning end of the bottom plate prestressed tendon is arranged at the center of the bottom plate or the post-cast strip area, the through-length bundle of the prestressed tendon cannot pass through the root parts of two shear walls at the same time, the through-length prestressed tendon in the post-cast strip area is combined with the non-through-length prestressed tendon, and the non-through-length prestressed tendon accounts for more than the through-length prestressed tendon in the total amount of the prestressed tendon in the post-cast strip area.

[0022] Preferably, the polyester fiber reinforced net + PVC coating hose installation in S2 comprises the following steps: one or more polyester fiber reinforced net + PVC coating hoses are used for construction, bottom wood strips are arranged on the surface of the formwork according to the construction drawing position, the PVC coating hose is passed through the double-layer steel reinforcement fixed support, after the bottom steel reinforcement and the fixed support are installed, water is not filled temporarily, and then the upper steel reinforcement is bound and water filling and fixing are performed after the upper steel reinforcement is bound.

[0023] Preferably, the coating hose fixing and water filling in S2 comprises the following steps: when the plate thickness is more than 300 mm, the number of polyester fiber reinforced net + PVC coating hoses reaches three or more, and double-layer fixed support steel reinforcement Φ10@500 is arranged to prevent the polyester fiber reinforced net + PVC coating hose from falling off before the concrete is poured, the both ends are blocked by using a special joint after reinforcement is completed, and the water filling pump is used to fill water before the concrete is poured, and the water filling pressure is less than 0.6 Mpa.

[0024] Preferably, the thermocouple sensor arrangement in S2 comprises the following steps: for the circulating pipe system of different depths of the bottom plate engineering, the temperature measuring point is 1 m away from the horizontal edge of the bottom plate, the horizontal interval is set to 4.5-6.0 m, each temperature sensor of the measuring point is connected with the lead wire and the temperature measurement and control instrument, and is arranged on, in and under the concrete, the center distance between the upper and lower sensors and the upper surface and the lower bottom of the concrete is 0.3 m, and the distance from the circulating pipe is greater than 0.3 m, the sensor contact with the steel reinforcement needs to be isolated by using insulation material during installation, so as to accurately monitor the internal temperature change of the concrete.

[0025] Preferably, the water storage and transfer tank construction in S2 comprises the following steps: before the construction site dewatering construction, the underground water storage and transfer tank is built first, the water tank is connected with the dewatering discharge water and the site rainwater collection system, and the control of the recharge water is realized by means of the automatic opening and closing of the electronic inductor of the water level observation float valve and the electric water pump.

[0026] Preferably, the brick formwork in S4 is built to a height of 300 mm above the upper surface of the bottom plate, and is subjected to double-sided cement waterproof mortar finishing.

[0027] The application has the following advantages:

[0028] 1. In view of the disadvantages of the current construction method of traditional bottom slab concrete and side wall concrete, the application makes technical innovation on temperature control, crack resistance and seepage prevention of bottom slab concrete and side wall concrete, the bottom slab concrete uses bonded prestressed steel and ordinary steel to resist temperature shrinkage deformation together, the non-post-pouring belt area adopts PVC coated hose circulating pipe network, the post-pouring belt area adopts polyester fiber reinforcement net + PVC coated hose as the support of side formwork to replace the traditional steel mesh, wood formwork and other methods, adopts multiple constraint seepage prevention technology, effectively reduces the risk of post-pouring belt leakage. The high-molecular protective drainage special-shaped piece is used to build the hollow layer of the wall surface on the post-pouring belt of the basement side wall, and the hollow layer at the post-pouring belt of the basement side wall is used to isolate the underground water return and drain the seepage water. Through the practice of many projects, the achievement has innovation, operability, generalizability, significant economic benefit and social benefit.

[0029] 2. The polyester fiber reinforcement net + PVC coated hose is used to set up a ring network under the bottom slab, and when pouring and tamping concrete, it is not easy to appear bulging, slurry leakage and other phenomena, the forming effect is good, manual chiseling and cleaning of bulging and slurry leakage are not needed, time and labor are saved, cost is saved, and it is beneficial to the improvement of construction quality.

[0030] 3. The polyester fiber reinforcement net + PVC coated hose is used to set up a method at the post-pouring belt of the bottom slab, which is used as a post-pouring belt formwork support, replacing the traditional steel mesh and plywood hard formwork setting, the steel bars are usually dense at the post-pouring belt, especially at the post-pouring belt, and it is not necessary to slot, drill or arrange in the form of fixed small wooden strips, as long as the polyester fiber reinforcement net + PVC coated hose is passed through the steel bars from the upper and lower steel bars of the post-pouring belt and then filled with water, the installation can be completed, which is simple to install, convenient to construct and saves construction period.

[0031] 4. The high-molecular protective drainage special-shaped piece is fully laid on the bottom slab and the post-pouring belt joint surface of the advanced water stop post-pouring belt, the convex table is downward, the hollow layer of the floor is formed on the special-shaped piece fulcrum, and the seepage water of the post-pouring belt of the basement bottom slab can be quickly discharged.

[0032] 5. The high-molecular protective drainage special-shaped piece is used to build the hollow layer of the wall surface on the post-pouring belt of the basement side wall, which is communicated with the hollow layer between the advanced water stop post-pouring belt and the post-pouring belt joint surface, and is used to isolate the underground water return and drain the seepage water, after the bottom slab concrete is poured and reaches the final setting, the water in the polyester fiber reinforcement net + PVC coated hose is discharged, the hose is pulled out to complete the formwork removal, and the removal is easy. It can be reused, improves the turnover frequency, and reduces the construction cost. The concrete PVC coated hose internal circulating pipe network can realize early circulating temperature control, medium-term maintenance and late drainage and steam exhaust functions of the concrete structure.

[0033] 6. By using a pre-installed PVC-coated flexible hose circulation network in the concrete to absorb and discharge heat, the high-temperature zone of hydration heat inside the concrete is difficult to concentrate, reducing the impact on the surrounding constraints of the concrete. This eliminates the need for temperature-controlled structural reinforcement, sliding layers, and external constraint mitigation measures, accelerating construction progress and reducing construction costs. Low-temperature water is delivered to various areas in the center of the concrete, absorbs heat, and then circulates and exchanges it externally. This provides strong operational initiative, improves upon conventional passive insulation practices, reduces construction difficulty, and minimizes the risk of high-temperature stress deformation within the concrete. By discharging the hydration heat from within the concrete, combined with the control of the circulating water volume, temperature, and flow rate, the temperature relationship between the internal and surface layers of the component is more effectively managed, improving the reliability of construction operations and ensuring component safety.

[0034] 7. The concrete surface is cured using circulating water, which makes the temperature adjustment of the curing water highly controllable, better maintains a reasonable temperature difference, and has a significant "external insulation" effect. There is no need to cover it with other insulation materials, thus improving construction efficiency.

[0035] 8. By installing thermocouple sensors at the temperature measurement points, the temperature change pattern inside the concrete is monitored in real time. When the temperature control warning value is reached, the flow rate and velocity of the circulating water are automatically adjusted to balance the temperature difference between the inside and outside of the concrete and control the rate of temperature rise inside the concrete, effectively solving the technical problem of preventing temperature cracks in "ultra-large volume concrete".

[0036] 9. This construction method involves continuous pouring in one go, eliminating the need for anti-crack measures such as skip-pouring. It simplifies the placement and treatment of expansion joints and post-pouring strips, accelerating construction progress, reducing construction costs, shortening concrete insulation time, enabling early formwork removal, facilitating external waterproofing of the foundation concrete and backfilling, and allowing for the construction of the superstructure, thus speeding up the project schedule. The three major circulating water systems—the interconnected circulating pipe network, the water in the integrated water storage and insulation curing tank on the foundation slab, and the recharge water—all originate from the foundation pit dewatering and on-site rainwater collection system, saving significant water resources, achieving green construction, and aligning with national energy conservation and environmental protection policies. Attached Figure Description

[0037] Figure 1 This is a schematic diagram showing the horizontal arrangement of the water-filling hose of the present invention.

[0038] Figure 2 This is a schematic diagram showing the horizontal arrangement of the flexible hoses in the post-cast strip area of ​​the present invention.

[0039] Figure 3 This is a schematic diagram of the arrangement of the circulating pipe drainage system of the present invention.

[0040] Figure 4 This is a schematic diagram of the arrangement of the plate when the thickness is 300-500mm.

[0041] Figure 5 This is a schematic diagram of the arrangement when the plate thickness of the present invention is 400-500mm.

[0042] Figure 6 It is a waterproofing arrangement schematic diagram of the back-poured belt of the outer wall of the application.

[0043] Figure 7 It is a fixing schematic diagram of the thermocouple sensor of the application.

[0044] 1, PVC coating hose; 2, batten; 3, steel reinforcement fixing support; 4, waterproof special-shaped sheet; 5, temperature sensor; 6, drainage ditch; 7, water collecting well; 8, bottom plate. DETAILED DESCRIPTION

[0045] The specific embodiments of the application will be further described in detail below with reference to the accompanying drawings, and by describing the embodiments, so as to help the skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical scheme of the application.

[0046] As shown in Figures 1-7 , the application provides a construction process of water-filled prestressed bottom plate concrete and side wall temperature control anti-cracking anti-seepage, comprising the following steps:

[0047] S1, formwork design: adopting double-layer polyester fiber reinforced net + PVC coating hose 1, wherein the PVC coating hose 1: wall thickness is 1.0 mm, burst pressure is 0.6 Mpa, diameter is 50 mm or 80 mm or 100 mm; batten 2 specification: 45x90 mm; multi-layer plate thickness: 15 mm to carry out circulating hose horizontal design and circulating hose vertical design;

[0048] Among them, the circulating hose horizontal design comprises the following steps: the water filling hose in the non-back-poured belt area is arranged in longitudinal and horizontal directions, and the interval is less than or equal to 6m x 6m; the water filling hose in the back-poured belt area is laid along the longitudinal direction on both sides of the back-poured belt, and the horizontal interval is less than or equal to 0.8m; the water inlet is left on the bottom plate 8 or the top surface of the pile cap, and the water outlet is left on the side surface of the pile cap or the side surface of the back-poured belt; the water filling hose intersection is not continuous, so as to facilitate the through water filling or removal; a tee joint is arranged at the back-poured belt to connect; after the bottom plate concrete pouring is completed and reaches the final setting, the water filling hose connected therewith is removed;

[0049] In addition, the circulating hose facade design comprises the following steps: in the non-post-cast strip area, when the plate thickness exceeds 400 mm, the required number of polyester fiber reinforced mesh + PVC coated hose 1 is greater than or equal to three, and the double support bracket adopts Φ10@500; in the post-cast strip area of the advanced water stop post-cast strip area, when the plate thickness is greater than or equal to 400 mm, the bottom plate 8 is laid with a high polymer waterproof special-shaped sheet 4 on the upper part of the advanced post-cast strip, a lap joint is formed to form a water filtering channel, a through connection is made at the intersection of the post-cast strip, water is discharged to the nearby water collecting well 7 in time, 3-4 PVC coated hoses 1 are arranged in the expanded concrete of the post-cast strip, and the double sides of the PVC coated hose 1 are additionally provided with Φ10@500 double support brackets for reinforcement, so as to prevent the lateral displacement of the PVC coated hose 1 from causing the instability of the air separation column system and causing the mold explosion and slurry leakage. The multiple constraint anti-seepage technology is adopted to prevent the post-cast strip from seeping water.

[0050] In the double-layer vertical steel bars in the side wall post-cast strip area, a high polymer protection drainage special-shaped sheet is fully laid, the laying sequence is from top to bottom, additional steel bars are positioned and reinforced special-shaped sheets are formed, the hollow drainage layer in the side wall post-cast strip area is connected with the hollow drainage layer in the bottom plate 8 post-cast strip area at the corner, so that the seepage water outside the wall flows downward into the drainage layer of the bottom plate 8 and flows into the water collecting pit.

[0051] S2, pipe network, steel bar, water storage and transfer tank preparation and installation: the circulating hose construction includes steel bar binding, polyester fiber reinforced mesh + PVC coated hose 1 installation, PVC coated hose 1 fixing and water filling, thermocouple sensor layout, and then water storage and transfer tank construction is carried out.

[0052] The steel bar binding comprises the following steps: the tensioning end of the bottom plate 8 prestressed steel bar is arranged at the center of the bottom plate 8 or the post-cast strip area, the full-length bundle of the prestressed steel bar cannot pass through the roots of two shear walls at the same time, the full-length prestressed steel bar in the post-cast strip area is combined with the non-full-length prestressed steel bar, the broken reinforcement ratio at the structure column support of the post-cast strip span and the compression zone meet the requirements, and the non-full-length prestressed steel bar accounts for more than the full-length prestressed steel bar in the total amount of the prestressed steel bar in the post-cast strip area.

[0053] In addition, the polyester fiber reinforced mesh + PVC coated hose 1 installation comprises the following steps: one or more polyester fiber reinforced mesh + PVC coated hoses 1 are used for support during construction, bottom wood strips are arranged on the surface of the formwork according to the position on the construction drawing, the PVC coated hose 1 passes through the double-layer steel bar fixed support 3, after the bottom steel bar and the fixed support are installed, the polyester fiber reinforced mesh + PVC coated hose 1 needs to be placed in place, and water is not filled temporarily, and then water filling and fixing are carried out after the upper steel bar binding is completed.

[0054] In addition, the coating hose fixing and water filling include the following steps: when the plate thickness exceeds 300 mm, the number of polyester fiber reinforced net + PVC coating hoses reaches three or more, and double-layer fixing support steel Φ10@500 is arranged to prevent the polyester fiber reinforced net + PVC coating hose from falling off before the concrete pouring, and after the reinforcement is completed, the two ends are blocked with special joints, the water filling is carried out with a water filling pump before the concrete pouring, the water filling pressure is less than 0.6 Mpa to prevent the hose from bursting, and the polyester fiber reinforced net + PVC coating hose 1 at the advanced water stop post-pouring belt position is filled with water to form a water column to play the effect of a side mold, so that the concrete pouring is ensured without grout leakage and mold running.

[0055] However, the thermocouple sensor arrangement includes the following steps: for the circulating pipe system of different depths of the bottom plate 8 project, the temperature measuring point is 1 m away from the horizontal edge of the bottom plate 8, the horizontal spacing is set to 4.5-6.0 m, the water flow is controlled, each temperature sensor 5 is connected with a lead wire and a temperature measurement and control instrument, a WZG-010 resistance temperature sensor (produced in Shanghai) is used as the most basic temperature measuring unit, and is buried on, in and under the concrete, the center distance between the upper and lower sensors and the upper surface and lower bottom of the concrete is 0.3 m, and the distance from the circulating pipe is greater than 0.3 m. When installing, the sensor needs to be isolated from the steel reinforcement with insulating material to accurately monitor the internal temperature change of the concrete.

[0056] In addition, the water storage and transfer tank construction includes the following steps: before the construction site dewatering construction, first build the underground water storage and transfer tank (the water tank is divided into three parts, the bottom of the tank is high, medium and low, which plays a role in sedimentation and filtration, and the size of the water tank is determined according to the size of the project), the water tank is connected with the dewatering discharge water and the site rainwater collection system, and the control of the recharge water is realized through the automatic opening and closing of the electronic inductor of the water level observation float valve and the electric water pump.

[0057] S3, concrete pouring and initial start of internal circulation: before pouring the concrete, the pre-installed circulating pipe network (internal circulation) is connected with the water storage and transfer tank (external circulation) pipeline using a special joint, the pump is started in advance to water the circulating pipe network system, and pressure test is performed, each joint is carefully checked to ensure that the pipeline is leakproof; if water leakage is found, it should be marked, stopped and repaired to ensure that the place is leakproof; during the concrete pouring process, the pre-installed circulating pipe network (internal circulation) is started, the circulating water in the internal circulating pipe network is run in the concrete, part of the heat inside the bottom plate 8 and the pile cap concrete in the initial pouring process is taken away, the circulating water is heated synchronously during the whole concrete pouring process, which can effectively reduce the internal temperature before the initial setting of the concrete, and the heat preservation and covering measures before the initial setting of the concrete can be omitted.

[0058] S4, before the initial setting of the concrete, use the brick formwork of the peripheral guide wall of the bottom plate 8, the height of the brick formwork is 300mm higher than the upper surface of the bottom plate 8, and the double-sided cement waterproof mortar is applied, forming a water storage and heat preservation maintenance pool, a small submersible pump is pre-installed in the water storage and heat preservation maintenance pool, and the high-temperature water is discharged to the external circulation system in time, while the low-temperature water is introduced, and the circulation water is cooled by increasing the water flow exchange;

[0059] S5, after the initial setting of the concrete, the outer circulation, surface circulation and inner circulation are implemented in three interconnected operations: the inner circulation and surface circulation system control the electric water pump through the concrete temperature monitoring system to implement full-range synchronous circulation water exchange, the outer circulation system controls the electric water pump through the recharge well monitoring system to automatically control the flow and speed of the recharge water, the outer circulation and surface circulation system control the electric water pump through the automatic float valve and intelligent temperature control instrument of the water storage and heat preservation maintenance pool on the bottom plate 8 to implement full-range automatic monitoring and synchronous circulation water exchange, and the uninterrupted heat conduction process of the circulation water is realized.

[0060] S6, mid-term concrete temperature control and monitoring and acceptance: after the final setting of the concrete, the water in the pre-installed circulation pipe is drained, then the PVC coated hose 1 is pulled out and removed, the polyester fiber reinforced net + PVC coated hose 1 cannot be pulled out by force when the formwork is removed, the polyester fiber reinforced net + PVC coated hose 1 after removal is cleaned with clean water, dried and reused, and water is injected into the concrete circulation hole, and the water flow in the bottom plate 8 concrete structure continues to flow into the overall water storage and maintenance pool on the bottom plate 8, and the bottom plate 8 concrete interior and surface are maintained for not less than 14 days;

[0061] S7, concrete internal drainage and steam exhaust: after the concrete maintenance for 14 days, when the temperature difference between the inside and outside of the concrete is continuously lower than the critical value of 25℃ specified in the specification for 3 days, the circulation water work can be stopped, the water in the bottom plate 8 concrete hole is drained, the circulation maintenance water is led to the drainage ditch 6 on the inner side of the basement outer wall, and is discharged to the nearby water collecting well 7, the bottom plate 8 concrete internal circulation pipe is connected with the bottom plate 8 peripheral drainage ditch 6 and the water collecting well 7 to form a late-stage drainage and steam exhaust system.

[0062] The principle of the method is that the "inner circulation, surface circulation and outer circulation" three-circulation system is set in the early stage of the bottom plate concrete, the water flow and heat exchange change the flow rate, flow volume and water temperature in the circulation to realize uninterrupted heat conduction of the circulation water; in the middle stage, the circulation pipe network continues to play a role: concrete internal and external temperature control and concrete surface water storage and maintenance; in the later stage, the maintenance water in the PVC coated hose 1 of the bottom plate concrete is drained, the hose is pulled out to complete the form removal, the bottom plate 8 is connected with the drainage facilities of the side wall and the drainage facilities of the basement floor to form a drainage and steam exhaust channel, and the seepage resistance and crack resistance are realized.

[0063] Early circulation temperature control principle: internal circulation in prestressed foundation concrete, PVC-coated circulating pipe network is set, PVC-coated hose 1 in prestressed foundation concrete plate is laid out in depth, thermocouple temperature measuring point is designed in depth; PVC-coated circulating pipe network is connected with the surface water storage heat preservation pool of bottom plate 8 and external water storage transfer pool, water in the circulating pipe network in concrete is run, part of heat in the internal of bottom plate and bearing platform concrete during pouring process is taken away, so that the circulating water is synchronized in temperature during the whole process of concrete pouring, and the circulating pipe network is exchanged by cold and heat, and the circulating temperature is controlled.

[0064] Mid-term maintenance function principle: after the final setting of concrete, the PVC-coated hose 1 of the circulating pipe network in the prestressed bottom plate concrete structure is pulled out and removed, water is injected into the concrete, and the internal structure of the concrete is maintained; the water flow in the concrete structure continues to flow into the bottom plate to form an integrated water storage maintenance pool, which is used as water for the maintenance of the surface of the bottom plate concrete and the internal maintenance of the bottom plate concrete.

[0065] Late drainage and steam exhaust principle: after fourteen days of concrete maintenance, the maintenance circulating water stops, and the water in the concrete hole is drained. The late circulating maintenance water is led to the drainage ditch 6 on the inner side of the basement outer wall, and is drained to the nearby water collecting well 7. The drainage and steam exhaust holes formed in the bottom plate are communicated with the drainage ditch 6 and the water collecting well 7 around the bottom plate, and form a late drainage and steam exhaust system.

[0066] The main key technologies of the application include:

[0067] 1. Early circulating temperature measurement and control deepening design technology of prestressed concrete structure: according to the thickness of prestressed concrete structure, the number, layout form, fixing mode, inlet and outlet form and position of PVC-coated hose 1 are optimized; the temperature measuring equipment is optimized, and the temperature measuring point is laid out, so as to accurately monitor the internal temperature change of prestressed concrete structure.

[0068] 2. Early circulating pipe network (internal circulation) construction technology: according to the deepening design scheme, polyester fiber reinforced network + PVC-coated hose 1 is installed in the gap between the upper and lower steel bars in the bottom plate concrete structure, and after the installation of PVC-coated hose 1, water is filled, the polyester fiber reinforced network + PVC-coated hose is extruded by the gap caused by the steel bars, and the water column formed after the hose is filled with water is used to block the concrete, and the circulating pipe network is formed.

[0069] 3. Early and mid-term water storage heat preservation and maintenance (surface circulation) construction technology: the brick formwork of the peripheral guide wall of the bottom plate is used to carry out double-sided cement waterproof mortar finishing, and a water storage heat preservation and maintenance pool is formed. The "internal circulation" and "external circulation exchange circulation" are used to maintain the surface of the bottom plate concrete, which is beneficial to adjust the surface temperature of the bottom plate concrete.

[0070] 4. Early cycle water collection and transfer storage (external circulation) construction technology: collect outdoor precipitation, rainwater precipitation and store in water storage transfer tank, initially pump to circulating pipe network system, later control electric water pump through recharge well monitoring system, automatically control recharge water flow and flow rate, and continuously replace water flow to circulating pipe network to realize dynamic adjustment of concrete internal humidity.

[0071] 5. Advanced water stop post-pouring belt construction technology: PVC coated hose is buried on the bottom plate on both sides of the advanced water stop post-pouring belt, high polymer protection drainage special-shaped sheet is fully laid on the post-pouring expansion concrete bottom plate, the upper layer is filtered and flows into the water collection pit, 50mm expansion joint is left in the middle of the advanced water stop belt, extruded polystyrene board is filled in the expansion joint, embedded rubber water stop belt is arranged in the middle, the hose is led to the longitudinal and transverse coated hoses under the nearby bottom plate partition joint to form a longitudinal and transverse intersecting circulating pipe network, high polymer protection drainage special-shaped sheet is fully laid between the double-layer vertical reinforcements in the side wall post-pouring belt area, additional reinforcement is positioned and reinforced, the hollow drainage layer of the side wall post-pouring belt area and the hollow drainage layer of the bottom plate post-pouring belt area are connected at the corner, so that the seepage water outside the wall flows downward into the drainage layer of the bottom plate and flows into the water collection pit.

[0072] 6. Bottom plate concrete mid-term internal and external collaborative maintenance construction technology: after the concrete is finally cured, the circulating pipe network PVC coated hose in the prestressed concrete structure is pulled out and removed, water is injected into the concrete internal structure for maintenance; the water flow in the concrete structure continues to flow into the overall water storage maintenance tank on the bottom plate, which is used as water for concrete surface maintenance.

[0073] 7. Bottom plate concrete late-stage drainage and steam exhaust construction technology: after the concrete is maintained for fourteen days, the maintenance circulating water is stopped, the water in the concrete hole is drained, and the late-stage circulating maintenance water is led to the drainage ditch inside the basement outer wall and drained to the nearby water collection well. The steam exhaust channel formed in the bottom plate is connected with the drainage ditch around the bottom plate and the water collection well to form a late-stage drainage and steam exhaust system.

[0074] The application is described above in conjunction with the drawings, and it is obvious that the specific implementation of the application is not limited by the above method. Any non-essential improvement or direct application of the application and technical solution to other occasions is within the protection scope of the application.

Claims

1. A construction process for a water-filled prestressed concrete base slab and sidewalls with temperature control, crack resistance, and seepage prevention, characterized in that: The method comprises the following steps: S1, template design: adopt double-layer polyester fiber reinforced net + PVC coated hose (1), wood (2) and multi-layer board to design circulating hose horizontally and vertically; S2, pipe network, steel bar, water storage and transfer tank preparation and installation: conduct circulating hose construction including steel bar binding, polyester fiber reinforced net + PVC coated hose (1) installation, PVC coated hose (1) fixing and water filling, thermocouple sensor layout, and then conduct water storage and transfer tank construction; S3, concrete pouring and internal circulation initial start: before concrete pouring, connect the preset circulating pipe network and the water storage and transfer tank pipeline by using a special joint, and pre-pump water to the circulating pipe network system; during concrete pouring, start the preset circulating pipe network, and run water in the circulating pipe network in the concrete to take away part of the heat in the bottom plate (8) and bearing platform concrete in the initial pouring process, so that the circulating water is synchronously heated in the whole concrete pouring process; S4, build a water storage and heat preservation maintenance tank before concrete initial setting: before concrete initial setting, use the brick formwork of the peripheral guide wall of the bottom plate (8) to build a water storage and heat preservation maintenance tank, preset a small submersible pump in the water storage and heat preservation maintenance tank, timely discharge high-temperature water to the external circulation system, and at the same time, exchange low-temperature water to cool the circulating water by increasing water flow exchange amount; S5, after concrete initial setting, implement three-communication operation of external circulation, surface circulation and internal circulation: the internal circulation and surface circulation systems control the electric water pump by the concrete temperature monitoring system to implement whole-process synchronous circulating water exchange, the external circulation system controls the electric water pump by the recharge well monitoring system to automatically control the flow and flow rate of recharge water, and the external circulation and surface circulation systems control the electric water pump by the automatic float valve and intelligent temperature control instrument of the water storage and heat preservation maintenance tank on the bottom plate (8) to implement whole-process automatic monitoring and synchronous circulating water exchange; S6, medium-term concrete temperature control and maintenance and monitoring and acceptance: after concrete final setting, first, drain the water in the preset circulating water pipe, then, pull out and remove the PVC coated hose (1), clean the polyester fiber reinforced net + PVC coated hose (1) after removal by using clean water, dry the polyester fiber reinforced net + PVC coated hose (1) after drying, and then reuse the polyester fiber reinforced net + PVC coated hose (1), at the same time, inject water into the concrete circulating hole, and make the water flow in the bottom plate (8) structure continue to flow into the overall water storage and maintenance tank on the bottom plate (8) to maintain the bottom plate (8) concrete inside and surface for no less than 14 days; S7, concrete internal drainage and steam exhaust: after concrete maintenance for 14 days, when the temperature difference between the inside and outside of the concrete is continuously less than 25℃, the critical value specified in the specification, for 3 days, stop the circulating water work, drain the water in the bottom plate (8) concrete hole, and lead the circulating maintenance water to the basement outer wall inside drainage ditch (6), and then to the nearby water collecting well (7), the bottom plate (8) concrete internal circulating pipe and the bottom plate (8) peripheral drainage ditch (6) and the water collecting well (7) are connected to form a later-stage drainage and steam exhaust system.

2. The construction process of the water-filled prestressed bottom slab concrete and side wall temperature control anti-cracking and anti-seepage according to claim 1, characterized in that: The PVC coated hose (1) in S1 has a wall thickness of 1.0 mm, a burst pressure of 0.6 Mpa, and a diameter of 50 mm, 80 mm or 100 mm; the wood (2) has a specification of 45×90 mm; and the multi-layer board has a thickness of 15 mm.

3. The construction process of the water-filled prestressed bottom slab concrete and side wall temperature control anti-cracking and anti-seepage according to claim 1, characterized in that: The horizontal design of the circulating hose in S1 includes the following steps: the water filling hose in the non-post-cast strip area is arranged horizontally in longitudinal and transverse directions, with a spacing of less than or equal to 6m x 6m; the water filling hose in the post-cast strip area is laid along the two sides of the post-cast strip in a longitudinal direction, with a horizontal spacing of less than or equal to 0.8m, the water inlet is left on the bottom plate (8) or the top surface of the pile cap, and the water outlet is left on the side surface of the pile cap or the side surface of the post-cast strip.

4. The construction process of the water-filled prestressed bottom slab concrete and side wall temperature control anti-cracking and anti-seepage according to claim 1, characterized in that: The vertical design of the circulating hose in S1 includes the following steps: in the non-post-cast strip area, when the plate thickness exceeds 400mm, the number of required polyester fiber reinforced mesh + PVC coated hose (1) is greater than or equal to three, and Φ10@500 double support brackets are used; in the post-cast strip area of the advanced water stop, when the plate thickness is greater than or equal to 400mm, the bottom plate (8) is laid with high polymer waterproof special-shaped sheet (4) on the upper part of the post-cast strip, which is connected by overlapping to form a water filtering channel, and is connected through at the intersection of the post-cast strip to timely drain water to the nearby water collecting well (7), 3-4 PVC coated hoses (1) are arranged in the expanded concrete of the post-cast strip, and Φ10@500 double support brackets are additionally arranged on both sides of the PVC coated hose (1) for reinforcement; in the post-cast strip area of the side wall, high polymer protective drainage special-shaped sheets are fully laid between the double vertical steel bars, the laying sequence is from top to bottom, additional steel bars are positioned to reinforce the special-shaped sheets, and the hollow drainage layer in the post-cast strip area of the side wall is connected with the hollow drainage layer in the post-cast strip area of the bottom plate (8) at the corner, so that the seepage water outside the wall flows downward into the drainage layer of the bottom plate (8) and flows into the water collecting pit.

5. The construction process of the water-filled prestressed bottom slab concrete and side wall temperature control anti-cracking and anti-seepage according to claim 1, characterized in that: The steel bar binding in S2 includes the following steps: the tensioning end of the prestressed steel bar of the bottom plate (8) is arranged at the center of the bottom plate (8) or in the post-cast strip area, the full-length bundle of the prestressed steel bar cannot pass through the root of two shear walls at the same time, the full-length prestressed steel bar in the post-cast strip area is combined with the non-full-length prestressed steel bar, and the total amount of the non-full-length prestressed steel bar in the post-cast strip area is greater than that of the full-length prestressed steel bar.

6. The construction process of water-filled prestressed bottom slab concrete and side wall temperature control anti-cracking and anti-seepage according to claim 1, characterized in that: The installation of the polyester fiber reinforced mesh + PVC coated hose (1) in S2 includes the following steps: one or more polyester fiber reinforced mesh + PVC coated hoses (1) are used for support during construction, bottom wooden bars are arranged on the surface of the formwork according to the position on the construction drawing, the PVC coated hose (1) passes through the double-layer steel bar fixed support (3), after the bottom steel bar and the fixed support are installed, water is not filled temporarily, and then water filling and fixing are performed after the upper steel bar binding is completed.

7. The construction process of water-filled prestressed bottom slab concrete and side wall temperature control anti-cracking and anti-seepage according to claim 1, characterized in that: The fixing and water filling of the coated hose in S2 include the following steps: when the plate thickness exceeds 300mm, the number of polyester fiber reinforced mesh + PVC coated hoses reaches three or more, and double-layer fixed support steel bars Φ10@500 are arranged to prevent the polyester fiber reinforced mesh + PVC coated hose from falling off before the concrete is poured, after the reinforcement is completed, the two ends are sealed with special joints, the concrete is poured before the water filling pump is used for water filling, and the water filling pressure is less than 0.6Mpa.

8. The construction process of the water-filled prestressed bottom slab concrete and side wall temperature control anti-cracking and anti-seepage according to claim 1, characterized in that: The heat couple sensor arrangement in S2 includes the following steps: for the circulating pipe system of different depths of the bottom plate (8) project, the temperature measuring point is 1 m away from the horizontal edge of the bottom plate (8), the horizontal interval is set to 4.5-6.0 m, each temperature sensor (5) is connected with the temperature measuring and control instrument through a wire, and is buried on, in and under the concrete, the center distance between the upper and lower sensors and the upper surface and lower bottom of the concrete is 0.3 m, and is greater than 0.3 m away from the circulating pipe, the contact part between the sensor and the steel bar needs to be isolated by insulation material during installation, so as to accurately monitor the internal temperature change of the concrete.

9. The construction process of water-filled prestressed bottom slab concrete and side wall temperature control anti-cracking and anti-seepage according to claim 1, characterized in that: The construction of the water storage and transfer tank in S2 includes the following steps: before the construction of the construction site dewatering, the underground water storage and transfer tank is built first, the water storage and transfer tank is communicated with the dewatering discharge water and the construction site rainwater collection system, and the control of the recharge water is realized through the automatic opening and closing of the electronic inductor of the water level observation float valve and the electric water pump.

10. The construction process of water-filled prestressed bottom slab concrete and side wall temperature control anti-cracking and anti-seepage according to claim 1, characterized in that: The brick formwork in S4 is built with a height of 300 mm higher than the upper surface of the bottom plate (8), and is double-faced cement waterproof mortar finished.

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