Manufacturing method of prefabricated building pile foundation

Abstract

The invention provides a manufacturing method of a prefabricated building pile foundation, the manufacturing method is realized through a temperature control template, the temperature control template comprises a template body, the template body is divided into a plurality of mutually spliced subunits along the height direction, the inner wall of each subunit is provided with a temperature sensor in an array, and the temperature sensor is connected with the template body. The temperature sensor is used for detecting the surface temperature of the pile foundation; the manufacturing method comprises the steps that concrete pouring is conducted on each subunit from bottom to top in sequence, then tamping is conducted, after tamping is finished, the temperature of each surface of the pile foundation in each subunit is obtained through a temperature sensor, whether the temperature difference of each surface of the pile foundation in each subunit is lower than a first threshold value or not is judged, and if yes, the pile foundation in each subunit is manufactured. If yes, it is judged that tamping is uniform.

Description

Technical Field

[0001] The present application relates to the technical field of prefabricated component manufacturing, and in particular to a method for manufacturing a prefabricated building pile foundation. Background Art

[0002] The length of the pile foundation of a building is generally between 10m and 30m. When it is produced in a prefabricated factory, the pile foundation has to be cast in layers. However, due to the different order of casting, the solidification speed of the concrete in the lower part is often faster than that of the concrete in the upper part. The different solidification speeds of concrete in different layers will lead to uneven shrinkage between the layers. When the lower concrete solidifies faster and the upper concrete is still in a plastic state, the shrinkage of the lower concrete may be restricted by the upper concrete, thereby generating tensile stress. When the tensile stress exceeds the tensile strength of the concrete, cracks will occur. At the same time, the degree of hydration reaction of concrete with different solidification speeds will also be different. The hydration reaction of concrete with faster solidification may not be sufficient, resulting in insufficient strength development; while the strength of concrete with slower solidification may be too high or uneven due to the long hydration reaction time, and the uneven strength will affect the bearing capacity and stability of the structure. When subjected to load, the lower strength part may be damaged first, resulting in overall failure of the structure.

[0003] At the same time, in the northern regions with lower temperatures, low temperature environments often have a significant impact on concrete structures. Due to the temperature difference between the surface and the interior of the concrete, especially when the cement inside the concrete reacts with water to form a hydration reaction, a significant thermal effect will be generated, which further aggravates the temperature gradient between the interior and the surface of the concrete. The existence of this temperature gradient will cause a large temperature stress between the interior and the surface of the concrete. If the tensile strength of the concrete itself is not enough to withstand the tension caused by the temperature stress, irregular cracks may appear on the surface of the concrete. These cracks may be visible to the naked eye or may be tiny cracks that are invisible to the naked eye. In most cases, these cracks cannot be self-repaired, and they will gradually expand under continuous load. Over time, these cracks will become channels for corrosive components, such as moisture and salt, to enter the interior of the concrete, thereby negatively affecting the integrity, impermeability and durability of the concrete structure. Summary of the invention

[0004] The object of the present invention is to solve the above-mentioned problems and provide a method for manufacturing a prefabricated building pile foundation.

[0005] A method for manufacturing a prefabricated building pile foundation, the manufacturing method is implemented by a temperature-controlled template, the temperature-controlled template comprises: a template body, and the template body is divided into a plurality of mutually spliced ​​sub-units along the height direction, and a temperature sensor is installed on the inner wall array of each sub-unit, and the temperature sensor is used to detect the surface temperature of the pile foundation;

[0006] The manufacturing method comprises:

[0007] Concrete is poured for each subunit from the bottom upwards, and then vibrated. After the vibration, the temperature of each surface of the pile foundation in each subunit is obtained through the temperature sensor, and it is determined whether the temperature difference of each surface of the pile foundation in each subunit is lower than the first threshold value. If so, it is determined that the vibration is uniform, and then the concrete pouring of the next subunit is carried out. Otherwise, it is determined that there is air at the position corresponding to the temperature difference exceeding the first threshold value, which makes the vibration uneven, and then the second vibration is carried out until the gas is discharged from the position corresponding to the temperature difference exceeding the first threshold value and the temperature is tended to other surfaces, and then the concrete pouring of the next subunit is carried out; the above steps are repeated until all subunits are poured.

[0008] The advantages or beneficial effects of the above technical solution include at least:

[0009] By using a formwork equipped with a temperature control module that can pump temperature control liquid, the formwork can be precisely temperature regulated. This method can effectively adjust the temperature of the concrete surface to ensure that the temperature difference between it and the temperature inside the concrete remains within a reasonable range. In addition, the controller has the function of intelligently identifying abnormal temperature areas and hollow areas inside the concrete. After identifying the abnormal temperature areas inside the concrete, the temperature control liquid is accurately pumped to these specific areas. In this way, unnecessary temperature effects on other unaffected areas can be avoided during the temperature control process, thereby achieving optimal management of the overall temperature distribution of the concrete structure; by using the same set of temperature sensor arrays, not only can the bubbles in the concrete be identified, but the temperature can also be accurately detected. Such dual functions ensure that the quality of the concrete is fully guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The accompanying drawings illustrate exemplary implementations of the present application of embodiments of the present invention and, together with the description, are used to explain the principles of the present application. These drawings are included to provide a further understanding of the present application, and the drawings are included in and constitute a part of this specification.

[0011] Figure 1 A schematic diagram showing a temperature control template according to an embodiment of the present invention installed on a template body;

[0012] Figure 2A schematic diagram of installing a temperature control template according to an embodiment of the present invention is shown;

[0013] Figure 3 A schematic diagram showing an inner liquid flow channel of a middle submodule according to an embodiment of the present invention is shown;

[0014] Figure 4 A schematic diagram showing the internal liquid flow channels of the top submodule and the bottom submodule according to an embodiment of the present invention;

[0015] Figure 5 A schematic diagram showing a temperature-controlled liquid flowing through a submodule according to an embodiment of the present invention;

[0016] Figure 6 A schematic diagram showing a temperature-controlled liquid flowing through two submodules according to an embodiment of the present invention is shown;

[0017] Figure 7 A first schematic diagram showing a temperature-controlled liquid flowing through three submodules according to an embodiment of the present invention;

[0018] Figure 8 A second schematic diagram showing a temperature-controlled liquid flowing through three submodules according to an embodiment of the present invention;

[0019] Fig. 9 A third schematic diagram showing the temperature-controlled liquid flowing through three submodules according to an embodiment of the present invention;

[0020] Fig.10 A schematic diagram showing the position of the submodule corresponding to the template body according to an embodiment of the present invention;

[0021] Fig.11 A schematic diagram of a plane coordinate system for a method of drawing a regional distribution diagram of abnormal temperature inside concrete according to a first embodiment of the present invention is shown;

[0022] Fig.12 A three-dimensional schematic diagram showing a method for drawing a regional distribution diagram of abnormal temperature inside concrete according to the first embodiment of the present invention, in which an abnormal temperature region is projected onto a pile foundation;

[0023] Fig.13 A schematic diagram of a plane coordinate system for a method of drawing a regional distribution diagram of abnormal temperature inside concrete according to a second embodiment of the present invention is shown;

[0024] Fig.14 A three-dimensional schematic diagram showing a method for drawing a regional distribution diagram of abnormal temperature inside concrete according to a second embodiment of the present invention, in which an abnormal temperature region is projected onto a pile foundation;

[0025] Fig.15 A schematic diagram of a plane coordinate system for a method of drawing a plurality of regional distribution diagrams of abnormal temperatures inside concrete according to a second embodiment of the present invention is shown;

[0026] Fig.16 A three-dimensional schematic diagram showing a method for drawing a plurality of regional distribution diagrams of abnormal temperatures inside concrete according to a second embodiment of the present invention, in which an abnormal temperature region is projected onto a pile foundation;

[0027] Fig.17 A schematic diagram showing the pouring of temperature control liquid into the temperature detection area according to the distribution conditions in an embodiment of the present invention is shown.

[0028] Fig.18 A schematic diagram of the regional distribution of bubbles inside concrete is shown.

[0029] Figure numerals: 10, pile foundation; 20, temperature control template; 21, template body; 22, temperature control module; 221, bottom submodule; 222, top submodule; 223, middle submodule; 23, liquid pump; 231, opening; 24, liquid flow channel; 241, temperature control flow channel; 242, horizontal connecting flow channel; 243, vertical connecting flow channel; 244, angled connecting flow channel; 25, hose. DETAILED DESCRIPTION

[0030] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Instead, these embodiments are provided for a more thorough and complete understanding of the present application. It should be understood that the drawings and embodiments of the present application are only for exemplary purposes and are not intended to limit the scope of protection of the present application.

[0031] It should be noted that the modifications of "one" and "plurality" mentioned in the present application are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0032] The names of the messages or information exchanged between multiple devices in the embodiments of the present application are only used for illustrative purposes and are not used to limit the scope of these messages or information.

[0033] Reference Figure 1 and Figure 2 , a temperature control template, the temperature control template 20 includes:

[0034] The formwork body 21 is installed outside the pile foundation 10, and the formwork body 21 is used for pouring the pile foundation 10;

[0035] A temperature control module 22, the temperature control module 22 includes a plurality of submodules, and the submodules are installed on the subunits of the template body 21, and the submodules are installed on the outside of the template body 21 along the height direction of the template body 21;

[0036] Submodules include:

[0037] A bottom submodule 221 is installed at a portion of the template body 21 close to the bottom;

[0038] A top submodule 222 is installed at a portion of the template body 21 close to the top;

[0039] The middle submodule 223 is installed between the bottom submodule 221 and the top submodule 222;

[0040] Of course, when the height of the pile foundation 10 is exactly the same as the height when the top submodule 222 and the bottom submodule 221 are stacked together, there is no need to install the top middle submodule 223. The specific module installation can be selected according to the actual situation of the on-site construction.

[0041] Based on the above structure, a liquid flow channel 24 is provided inside each submodule, and a liquid pump 23 is installed on each submodule. The liquid pump 23 is used to pump the temperature control liquid into the liquid flow channel 24, and pump the temperature control liquid into the liquid flow channel 24 of the submodule in the adjacent direction; wherein, the adjacent directions include vertical, lateral and oblique directions; the temperature control liquid is circulated in the liquid flow channel 24, so that the temperature control liquid exchanges heat with the submodule, and after the temperature of the submodule changes, it exchanges heat with the formwork body 21, thereby affecting the surface temperature of the concrete. Further improvement, based on the above structure, the materials of the temperature control module 22 and the formwork body 21 are both made of materials with a thermal conductivity between 200 and 210 W / (m*K), and preferably, a thermal conductivity of 203 W / (m*K) is used, and the material type is selected from aluminum alloy materials.

[0042] The liquid pump 23 is also provided with an opening 231 for filling or discharging the temperature control liquid. The liquid pump 23 can also control the temperature control liquid to be discharged from the opening 231, or the on-site construction personnel insert the pipe for filling the temperature control liquid into the opening 231, and the liquid pump 23 inputs the temperature control liquid into the liquid flow channel 24, wherein the liquid flow channel 24 includes:

[0043] The temperature control channel 241 is distributed in the middle of the bottom submodule 221, the top submodule 222 and the middle submodule 223 in a "bow" shape. The "bow" shape distribution can increase the contact area between the temperature control liquid and the submodules, so that the temperature control liquid can efficiently exchange heat with the submodules.

[0044] The transverse connecting flow channel 242 is distributed on the left and right sides of the bottom submodule 221, the top submodule 222 and the middle submodule 223, and one end of the transverse connecting flow channel 242 is connected to the temperature control flow channel 241, and the other end passes through the side of the submodule;

[0045] Vertical connecting channel 243; in the middle submodule 223, the vertical connecting channel 243 is distributed at the top and bottom of the middle submodule 223, and one end is connected to the temperature control channel 241, and the other end passes through the upper and lower sides of the submodule;

[0046] In the top submodule 222, the vertical connecting channel 243 is distributed at the bottom of the top submodule 222, and one end is connected to the temperature control channel 241, and the other end passes through the lower side of the submodule;

[0047] In the bottom submodule 221 , the vertical connecting channel 243 is distributed at the top of the top submodule 222 , and one end is connected to the temperature control channel 241 , and the other end passes through the upper side of the submodule.

[0048] The liquid flow channel 24 further includes:

[0049] Angle connecting flow channel 244;

[0050] like Figure 3 As shown, in the middle submodule 223, the oblique connecting flow channels 244 are distributed at the four corners of the middle submodule 223;

[0051] like Figure 4 As shown, in the top submodule 222, the bevel connection flow channels 244 are distributed at the lower left corner and the lower right corner of the top submodule 222;

[0052] In the bottom submodule 221 , the bevel connection channels 244 are distributed at the upper left corner and the upper right corner of the bottom submodule 221 ;

[0053] The liquid pump 23 is installed at the position of the submodule corresponding to the oblique connecting flow channel 244, the vertical connecting flow channel 243 and the horizontal connecting flow channel 242, and the liquid pump 23 is also used to open or close the connecting flow channel at the corresponding position;

[0054] Furthermore, the connection flow channel of each submodule is connected to the connection flow channels of the adjacent submodules in the vertical direction, the horizontal direction and the diagonal direction through a hose 25;

[0055] The temperature control template 20 further includes a controller for controlling the liquid pump 23 on each submodule. The controller controls the liquid pump 23 to make the temperature control liquid flow through a maximum of three submodules through the liquid channel 24 and then be discharged through the opening 231. Because after the temperature control liquid flows through three submodules, the temperature of the liquid is equivalent to the temperature of the submodule and no longer has the temperature control ability, so there is no need to make it flow through the fourth submodule. Of course, the controller can also only control the liquid pump 23 so that the temperature control liquid only flows through one or two submodules before being discharged.

[0056] For example Figure 5As shown in the case of FIG. 1 , the submodule filled with blue oblique lines is the submodule through which the temperature-controlled liquid flows. At this time, only the bottom part of the concrete near the front side has a temperature abnormality (the temperature abnormality means that the difference between the surface temperature of the concrete and the internal temperature of the concrete is higher than the second threshold value, and the temperature-controlled liquid needs to be introduced to make the difference between the surface temperature of the concrete and the internal temperature at a safe level). At this time, the controller controls the liquid pump 23 so that the temperature-controlled liquid is discharged immediately after flowing through the submodule of the area until the internal temperature of the concrete in the area is balanced with the surface temperature;

[0057] For example Figure 6 As shown in the case of , at this time, the temperature of the bottom and the front part of the middle of the concrete is abnormal. At this time, the controller controls the liquid pump 23 so that the temperature control liquid only flows through the bottom submodule 221 and the middle submodule 223 of the area and then is immediately discharged until the internal temperature and surface temperature of the concrete in the area are balanced;

[0058] For example Figure 7 As shown in the situation, at this time, the bottom front side, the middle front side and the upper left side of the concrete have abnormal temperatures. At this time, the controller controls the liquid pump 23 so that the temperature-control liquid only flows through the bottom submodule 221, the middle submodule 223 and the top submodule 222 of the area and is immediately discharged until the internal temperature and surface temperature of the concrete in the area are balanced.

[0059] For example Figure 8 As shown in the situation, at this time, the bottom front side, the middle front side and the upper right side of the concrete have abnormal temperatures. At this time, the controller controls the liquid pump 23 so that the temperature-control liquid only flows through the bottom submodule 221, the middle submodule 223 and the top submodule 222 of the area and is immediately discharged until the internal temperature and surface temperature of the concrete in the area are balanced.

[0060] Of course, there are many more possible situations, which will not be presented here one by one. According to the above case, the controller can adjust the temperature of abnormal temperature areas in different areas of the concrete. The controller follows the principle of pumping the liquid to the sub-module in multiple directions up, down, left, right and sideways to transport the temperature-controlled liquid, where the temperature-controlled liquid includes water and oil.

[0061] The present invention also provides a method for manufacturing a prefabricated building pile foundation, which is implemented by a temperature-controlled template 20, wherein the temperature-controlled template 20 comprises: a template body 21, and the template body 21 is divided into a plurality of mutually spliced ​​sub-units along the height direction, and a temperature sensor is installed on the inner wall array of each sub-unit, and the temperature sensor is used to detect the surface temperature of the pile foundation 10;

[0062] The manufacturing method comprises:

[0063] Concrete is poured for each subunit from the bottom upwards, and then vibrated. After the vibration is completed, the temperature of each surface of the pile foundation 10 in each subunit is obtained through a temperature sensor, and it is determined whether the temperature difference of each surface of the pile foundation 10 in each subunit is lower than a first threshold value. If so, it is determined that the vibration is uniform, and then the concrete pouring of the next subunit is carried out. Otherwise, it is determined that there is air at the position corresponding to the temperature difference exceeding the first threshold value, which makes the vibration uneven, and then the second vibration is carried out until the gas is discharged from the position corresponding to the temperature difference exceeding the first threshold value and the temperature is brought close to other surfaces, and then the concrete pouring of the next subunit is carried out; the above steps are repeated until all subunits are poured.

[0064] The above method is not limited to the case where the cross-section of the template body 21 is rectangular. When the cross-section of the template body 21 is circular, the temperature sensors are evenly arranged along the inner wall; when the cross-section of the template body 21 is polygonal, the temperature sensors are evenly arranged along each edge.

[0065] When concrete is not vibrated evenly, bubbles will be generated, which will cause hollow areas in the concrete. Cement is missing in the hollow areas, which releases less heat. In addition, air insulation prevents external heat from entering. Heat release is concentrated in the dense areas, but hollowing causes uneven heat dissipation. Heat cannot accumulate continuously, and the effective volume of cement in the hollow areas is reduced, resulting in a decrease in total heat release. Therefore, the temperature of the hollow areas will be lower than that of other areas, specifically, lower than the first threshold. Taking the rectangular formwork body 21 as an example, Fig.18 As shown, the peak value of the temperature change curve of the third plane coordinate system is significantly lower than the peak values ​​of the temperature change curves of other plane coordinate systems. It is judged that bubbles may appear in this area and manual secondary vibration is required.

[0066] As a further improvement of the above method: by collecting the temperature change curves per unit time of concrete of different proportions, types and volumes after the completion of tamping and vibrating, and conducting detailed statistical analysis on these curves. Then, the regular characteristics of these temperature change curves are sorted and stored in the database for subsequent comparison and analysis. It should be noted that different parts of the hollow area will produce different curves, for example:

[0067] Case 1: When the temperature measurement point is inside the hollow drum, the peak value is significantly lower than expected;

[0068] Case 2: When the temperature measurement point is located at the edge of the hollow drum, a short high temperature appears first, but the overall peak (due to heat accumulation in the surrounding dense area) is still lower than the normal area;

[0069] Case 3: When the hollowing is dispersed and uniform, the overall temperature peak drops evenly and the curve is gentle;

[0070] After the concrete is poured and vibrated, the operator inputs key information such as the proportion, type and volume of the concrete currently used into the controller. The controller will accurately compare and analyze the input information with the temperature change curve stored in the database to estimate the location of the hollow area in the concrete. In addition, this method can also effectively measure some agglomerated areas of concrete and areas where stones are concentrated. This is because the moisture content in these areas is relatively low, resulting in lower temperature conduction efficiency than other areas, so the temperature change curves in these areas will show different characteristics from those in conventional areas. By identifying these special temperature change curves, engineers can make a more accurate assessment of the quality of the finished concrete product, thereby providing a scientific basis for subsequent quality control and improvement.

[0071] In the above, the method for determining the hollow area includes:

[0072] S211, establishing a number of plane coordinate systems equidistantly in the height direction of the pile foundation 10, wherein the plane coordinate system takes the height direction of the pile foundation 10 as the origin, the width direction as the X-axis, and the length direction as the Y-axis;

[0073] S212, calculating the average values ​​of the peak values ​​of the change curves in all the vertical coordinate systems, and screening out the plane coordinate systems whose peak temperatures of the change curves on the X-axis or the Y-axis are lower than the first threshold value;

[0074] S213, determining the temperature sensor at the position corresponding to the plane coordinate system selected in step S212, so as to determine the position of the hollow area.

[0075] Construction workers can carry out secondary vibration according to the location of the hollow area.

[0076] The manufacturing method further comprises a curing step, wherein the curing step comprises:

[0077] During the solidification of concrete, the internal temperature of the concrete is calculated based on the surface temperature of the pile foundation 10 detected by the temperature sensor, and it is determined whether the temperature difference between the internal and surface temperatures exceeds a second threshold value; if it exceeds the second threshold value, the temperature is determined to be abnormal, and a regional distribution map of the abnormal internal temperature of the concrete is drawn according to the position of the temperature sensor and the temperature detected by the temperature sensor. The controller pumps the temperature control liquid to the submodule corresponding to the position of the area according to the distribution map until the temperature is lower than the second threshold value. The temperature difference between the internal temperature and the surface temperature of the concrete should generally be controlled within 25°C, so the second threshold value is selected as 25°C.

[0078] In the above, the detection area of ​​the temperature sensor includes a side area located on the side of the template body 21, and each side area is further divided into a plurality of sub-areas according to the number of sub-modules in the height direction of the template body 21. The number of sub-areas is consistent with the number of sub-modules in the height direction of the template body 21, and at least one sub-module is installed on the portion of the outer side of the template body 21 corresponding to each sub-area, for example Fig.10 As shown, Arabic numerals represent the height direction of concrete, and English letters represent the four inner side surfaces of the template body 21. A temperature sensor array is installed in each detection area. It should be noted that Fig.10 The example in the figure is a case where each side has only one detection area in the width direction. In reality, it may also happen that there are multiple detection areas in the width direction of the side.

[0079] Combined with the above-mentioned control of the liquid flow channel 24 and the liquid pump 23, the temperature of the detection areas adjacent to the corresponding detection area above, below, left, right, or at an angle can be controlled at one time. For example, if the starting point is A1 or , then the end point can be: A2, A3 or B2, B3 or B2, C3 or B1, C1, etc.; for example, if the starting point is B2 or , then the end point can be: A2, D2 or B3 or A3, C3, D3 or C2, D2, B1, C1, etc.

[0080] In the above, the method for calculating the internal temperature of concrete according to the surface temperature of the pile foundation 10 includes the following steps:

[0081] S11. Determine the surface temperature Ts of the concrete;

[0082] S12. Calculate the internal temperature of the concrete: Ti=Ts+ΔT; wherein ΔT is the difference between the internal temperature and the surface temperature of the concrete.

[0083] in,

[0084] Where, Q is the heat of hydration per kilogram of cement (kJ / kg);

[0085] W is the amount of cement per cubic meter of concrete (kg / m3);

[0086] C is the specific heat capacity of concrete (kJ / (kg·℃)), which is taken as 0.97;

[0087] ρ is the density of concrete (kg / m3), generally taken as 2410;

[0088] H is the calculated thickness of concrete (m);

[0089] λ is the thermal conductivity of concrete (W / (m·K)), which is taken as 2.33;

[0090] τ is the age of concrete pouring (days);

[0091] In the above, the method of drawing a regional distribution map of abnormal temperature inside concrete according to the position of the temperature sensor and the temperature detected by the temperature sensor includes:

[0092] S221, establishing a plane coordinate system, wherein the plane coordinate system takes the height direction of the pile foundation 10 as the origin, the width direction as the X-axis, and the length direction as the Y-axis;

[0093] S222, according to the temperature value detected by the temperature sensor array, draw a temperature change curve on the X-axis and the Y-axis, determine the minimum value of the change curve, and extend to determine the outer contour of the temperature area, and draw the specific contour of the temperature abnormal area by calculating the distance between the temperature sensors at both ends of the change curve and the temperature abnormal area, such as Fig.11 As shown, the left and right ends of the temperature anomaly curve are the positions of the temperature sensors where the temperature anomaly is first detected, and the peak is the position where the temperature anomaly difference is the highest;

[0094] S223, establishing a vertical coordinate system, wherein the vertical coordinate system takes the length direction of the pile foundation 10 as the origin, the height direction as the X-axis, and the width direction as the Y-axis;

[0095] S224, according to the temperature values ​​detected by the temperature sensor array, draw a temperature change curve on the Y axis, determine the lowest value of the change curve, and extend to determine the outer contour of the temperature area, by calculating the distance between the temperature sensors at both ends of the change curve and the temperature abnormal area, and draw the specific contour of the temperature abnormal area in conjunction with the X axis of the plane coordinate system;

[0096] S225, identifying the area where the three-dimensional temperature abnormal area is located according to the specific contours drawn in step S223 and step S224, and forming a distribution map; Based on the above, the method for the distance between the temperature sensor and the temperature abnormal area includes: calculating the physical distance from the internal high temperature point to the surface

[0098] Where ΔT is the temperature difference between the interior and surface of the concrete; β s is the temperature gradient in the vertical direction, usually 0.29~1.08℃ / m;

[0099] like Figures 11 to 12 As shown,

[0100] The controller controls the liquid pump 23 according to the distribution map to pump the temperature-controlled liquid to the corresponding position. If the distribution crosses the detection area, the temperature can also be controlled at the same time, for example Fig.17In the case shown in FIG. 1 , the temperature abnormality areas calculated by the above method are distributed in areas A1, A2, B1, B2, C1, and D2. Then, according to this distribution, the controller controls the liquid pump 23 to discharge the temperature control liquid from area A1 through areas A2 and B2, and at the same time controls the liquid pump 23 to discharge the temperature control liquid from area B1 through areas C2 and D2. Fig.17 As shown by the blue single-point long dash arrow in the figure, of course, the above only gives a single example of the starting point and end point of the temperature-control liquid. As long as the temperature-control liquid can enter the sub-module, flow through the three sub-modules and then be discharged, there is no restriction on the end point and the starting point in principle.

[0101] The above method only roughly divides the temperature abnormality area, and the detection speed is fast, but the regional detection accuracy is relatively low. Therefore, as a second embodiment: a method for drawing a regional distribution map of the temperature abnormality inside the concrete according to the position of the temperature sensor and the temperature detected by the temperature sensor includes:

[0102] The method for drawing a regional distribution diagram of abnormal temperature inside concrete according to the position of the temperature sensor and the temperature detected by the temperature sensor comprises:

[0103] S231. Establish several plane coordinate systems in the height direction. The plane coordinate systems take the height direction of the pile foundation 10 as the origin, the width direction as the X-axis, and the length direction as the Y-axis.

[0104] S232, according to the temperature value detected by the temperature sensor array, draw a temperature change curve on the X-axis and the Y-axis, determine the minimum value of the change curve, and extend to determine the outer contour of the temperature area, and draw the specific contour of the temperature abnormal area by calculating the distance between the temperature sensors at both ends of the change curve and the temperature abnormal area;

[0105] S233, establish a vertical coordinate system, the vertical coordinate system takes the length direction of the pile foundation 10 as the origin, the height direction as the X-axis, and the width direction as the Y-axis, fit the values ​​of several plane coordinate systems with the vertical coordinate system, and form a distribution diagram.

[0106] like Fig.13 and 14 As shown, the second embodiment can accurately identify the area with abnormal temperature compared with the first embodiment, but the identification time is slower.

[0107] like Fig.15 and 16 As shown, this method can also identify multiple temperature anomaly areas.

[0108] In the description of the present application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0109] Those skilled in the art should understand that the above embodiments are only for the purpose of clearly illustrating the present application, and are not intended to limit the scope of the present application. For those skilled in the art, other changes or modifications may be made based on the above disclosure, and these changes or modifications are still within the scope of the present application.

Claims

1. A method for manufacturing a prefabricated building pile foundation, characterized in that: The manufacturing method is implemented by a temperature-controlled template, which includes: a template body, and the template body is divided into a plurality of mutually spliced ​​sub-units along the height direction, and a temperature sensor is installed in an array on the inner wall of each sub-unit, and the temperature sensor is used to detect the surface temperature of the pile foundation; The manufacturing method comprises: Concrete is poured for each subunit from the bottom upwards, and then vibrated. After the vibration, the temperature of each surface of the pile foundation in each subunit is obtained through the temperature sensor, and it is determined whether the temperature difference of each surface of the pile foundation in each subunit is lower than the first threshold value. If so, it is determined that the vibration is uniform, and then the concrete pouring of the next subunit is carried out. Otherwise, it is determined that there is air at the position corresponding to the temperature difference exceeding the first threshold value, which makes the vibration uneven, and then the second vibration is carried out until the gas is discharged from the position corresponding to the temperature difference exceeding the first threshold value and the temperature is tended to other surfaces, and then the concrete pouring of the next subunit is carried out; the above steps are repeated until all subunits are poured.

2. The method for manufacturing a prefabricated building pile foundation according to claim 1, characterized in that: When the cross section of the template body is circular, the temperature sensors are evenly arranged along the inner wall; when the cross section of the template body is polygonal, the temperature sensors are evenly arranged along each edge.

3. The method for manufacturing a prefabricated building pile foundation according to claim 1, characterized in that: The temperature control template further includes a temperature control module, which includes a plurality of submodules, and the submodules are installed on the subunits of the template body, each of the submodules is provided with a liquid flow channel, and each of the submodules is provided with a liquid pump, and the liquid pump is used to pump the temperature control liquid into the liquid flow channel, and pump the temperature control liquid into the liquid flow channel of the submodule in the adjacent direction; the liquid pump is also provided with an opening for injecting or discharging the temperature control liquid; the adjacent directions include vertical, lateral and oblique directions; the temperature control template further includes a controller for controlling the liquid pump on each of the submodules, and the controller allows the temperature control liquid to flow through at most three of the submodules and then be discharged through the opening; The manufacturing method further comprises a curing step, wherein the curing step comprises: During the solidification of concrete, the internal temperature of the concrete is calculated based on the surface temperature of the pile foundation detected by the temperature sensor, and it is determined whether the temperature difference between the internal and surface temperature exceeds a second threshold value; If it exceeds the second threshold, the temperature is judged to be abnormal, and a regional distribution map of the abnormal temperature inside the concrete is drawn according to the position of the temperature sensor and the temperature detected by the temperature sensor. The controller pumps the temperature control liquid to the submodule corresponding to the position of the area according to the distribution map until the temperature is lower than the second threshold.

4. The method for manufacturing a prefabricated building pile foundation according to claim 3, characterized in that: The method for calculating the internal temperature of concrete based on the surface temperature of the pile foundation detected by the temperature sensor comprises the following steps: S11. Determine the surface temperature Ts of the concrete; S12, calculating the internal temperature of the concrete: Ti = Ts + ΔT; wherein ΔT is the difference between the internal temperature and the surface temperature of the concrete; in, In the formula, Q is the heat of hydration per kilogram of cement (kJ / kg); W is the amount of cement per cubic meter of concrete (kg / m3); C is the specific heat capacity of concrete (kJ / (kg·℃)), which is taken as 0.97; ρ is the density of concrete (kg / m3), which is taken as 2410; H is the calculated thickness of concrete (m); λ is the thermal conductivity of concrete (W / (m·K)), which is taken as 2.33; τ is the age of concrete pouring (days).

5. The method for manufacturing a prefabricated building pile foundation according to claim 4, characterized in that: The method for drawing a regional distribution diagram of abnormal temperature inside concrete according to the position of the temperature sensor and the temperature detected by the temperature sensor comprises: S221, establishing a plurality of plane coordinate systems equidistantly in the height direction of the pile foundation, wherein the plane coordinate system takes the height direction of the pile foundation as the origin, the width direction as the X-axis, and the length direction as the Y-axis; S222, according to the temperature value detected by the temperature sensor array, draw a temperature change curve on the X-axis and the Y-axis, determine the minimum value of the change curve, and extend to determine the outer contour of the temperature area, and draw the specific contour of the temperature abnormal area by calculating the distance between the temperature sensors at both ends of the change curve and the temperature abnormal area; S223, establishing a vertical coordinate system, wherein the vertical coordinate system takes the length direction of the pile foundation as the origin, the height direction as the X-axis, and the width direction as the Y-axis, and fits the values ​​of several plane coordinate systems with the vertical coordinate system to form a distribution diagram.

6. The method for manufacturing a prefabricated building pile foundation according to claim 5, characterized in that: The method for calculating the distance between the temperature sensors at both ends of the variation curve and the temperature abnormality area comprises: calculating the physical distance x from the internal high temperature point to the surface; Where ΔT is the temperature difference between the interior and surface of the concrete; β s is the temperature gradient in the vertical direction.

7. The method for manufacturing a prefabricated building pile foundation according to claim 3, characterized in that: The submodules include: A bottom submodule, mounted on a portion of the template body close to the bottom; A top submodule, mounted on a portion of the template body close to the top; a middle submodule, installed between the bottom submodule and the top submodule; The temperature control module and the template body are made of materials with a thermal conductivity between 200 and 210 W / (m*K).

8. The method for manufacturing a prefabricated building pile foundation according to claim 7, characterized in that: The liquid flow channel comprises: The temperature control flow channel is distributed in the middle of the bottom submodule, the top submodule and the middle submodule in a "bow" shape; Transverse connecting flow channels are distributed on the left and right sides of the bottom submodule, the top submodule and the middle submodule, and one end of the transverse connecting flow channel is connected to the temperature control flow channel, and the other end passes through the side of the submodule; A vertical connecting flow channel, in the middle submodule, the vertical connecting flow channel is distributed at the top and bottom of the middle submodule, and one end is connected to the temperature control flow channel, and the other end passes through the upper and lower sides of the submodule; in the top submodule, the vertical connecting flow channel is distributed at the bottom of the top submodule, and one end is connected to the temperature control flow channel, and the other end passes through the lower side of the submodule; in the bottom submodule, the vertical connecting flow channel is distributed at the top of the top submodule, and one end is connected to the temperature control flow channel, and the other end passes through the upper side of the submodule; The liquid flow channel further comprises: Bevel connection flow channel; In the middle submodule, the oblique connecting flow channels are distributed at four corners of the middle submodule; In the top submodule, the oblique connecting flow channels are distributed at the lower left corner and the lower right corner of the top submodule; In the bottom submodule, the oblique connecting flow channels are distributed at the upper left corner and the upper right corner of the bottom submodule; The liquid pump is installed at a position of the submodule corresponding to the oblique connecting flow channel, the vertical connecting flow channel and the horizontal connecting flow channel, and the liquid pump is also used to open or close the connecting flow channel at the corresponding position.

9. The method for manufacturing a prefabricated building pile foundation according to claim 8, characterized in that: The connecting flow channel of each submodule is connected to the connecting flow channels of the adjacent submodules in the vertical direction, the transverse direction and the diagonal direction through a hose.

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