A method for setting the camber of precast beam pedestals on soft soil foundations

Abstract

The present invention provides a method for setting the camber of a precast beam pedestal on soft soil foundation, which includes the following steps: on-site investigation and data collection to obtain information on the geological conditions of the soft soil foundation layer, determine the foundation reinforcement range and treatment measures, and obtain relevant technical parameters of the composite foundation reinforcement pile; obtain the force characteristics of the precast beam pedestal; according to the structural dimensions and steel bar structure of the precast beam pedestal; calculate the maximum stress on the foundation and the stress on the foundation at both ends of the precast beam pedestal; obtain the deformation settlement curve Y1 of the precast beam pedestal on soft soil foundation; obtain the designed camber circular curve or quadratic parabola Y2; obtain the actual camber setting curve Y3; carry out the camber construction of the precast beam pedestal according to the obtained actual camber setting curve Y3. The present invention takes into account the maximum stress on the foundation and the stress on the foundation at both ends of the precast beam pedestal to analyze the possibility of foundation deformation and settlement, thereby reducing the camber setting according to the design theoretical value or empirical parameter value.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of precast beam and slab preparation, and particularly relates to a method for setting the camber of a precast beam pedestal on a soft soil foundation. Background Art

[0002] When designing precast beams and slabs, in order to enable the beam body to have sufficient strength and stiffness to withstand the bending moments generated by dead loads and live loads, prestressing tendons are often arranged. The negative bending moment generated by the tension of the prestressing tendons is used to offset the positive bending moment generated by dead loads and live loads. However, when the beams and slabs are prestressed, excessive upward camber will occur, and it is necessary to offset it by presetting a suitable downward reverse camber for the precast beam pedestal to ensure the smoothness of the linearity at the bottom of the beams and slabs.

[0003] When the precast beam pedestal is set on a soft soil foundation, the soft soil foundation is often treated by default without deformation settlement, and the camber is set directly according to the design theoretical value or empirical parameter value. The design theoretical value is based on the assumption that the precast beam pedestal is an absolute rigid body, and the empirical parameter value has great uncertainty. Therefore, large deviations are likely to occur, and it is very troublesome to adjust later. And large camber deviations will lead to unevenness at the bottom of the beams and slabs, affecting the subsequent installation of beams and slabs and the construction of the bridge deck pavement, and even seriously affecting the service life of the bridge. Summary of the Invention

[0004] The present invention mainly provides a method for setting the camber of a precast beam pedestal on a soft soil foundation to solve the technical problems raised in the above background art.

[0005] The technical solution adopted by the present invention to solve the above technical problems is as follows:

[0006] A method for setting the camber of a precast beam pedestal on a soft soil foundation, comprising the following steps:

[0007] Step 1, on-site investigation and data collection to obtain information on the geological conditions of the soft soil foundation layer, determine the foundation reinforcement range and treatment measures, obtain relevant technical parameters of the composite foundation reinforcement piles, and use cement mixing piles, powder jet piles, and high-pressure jet grouting piles for composite foundation reinforcement;

[0008] Step 2, obtain the force characteristics of the precast beam pedestal, and perform simulation calculations on the force characteristics of the precast beam pedestal, the information on the geological conditions of the soft soil foundation layer obtained in Step 1, the relevant technical parameters of the composite foundation reinforcement piles, and the force characteristics of the precast beam pedestal through three-dimensional finite element software to determine the structural dimensions and steel bar structures of the precast beam pedestal;

[0009] Step 3, obtain the data of the precast beam pedestal according to the structural dimensions and steel bar structures of the precast beam pedestal;

[0010] Step 4: Determine the self-weight of the beam slab, the load of the operators, and the load of the formwork and tools according to the design drawings and empirical parameters.

[0011] Step 5: Calculate the maximum stress on the foundation and the stress on the foundations at both ends of the precast beam pedestal based on the precast beam pedestal data obtained in Step 3 and the self-weight of the beam slab, the load of the operators, and the load of the formwork and tools obtained in Step 4.

[0012] Step 6: Based on the maximum stress calculated in Step 5 and the stress on the foundations at both ends of the precast beam pedestal, form a three-dimensional numerical simulation using finite element software to obtain the deformation and settlement curve Y1 of the precast beam pedestal on the soft soil foundation.

[0013] Step 7: Obtain the reverse arch design circular curve or quadratic parabola Y2 according to the design drawings, or deduce the quadratic parabola Y2 according to the reverse pre-camber value setting table in the design drawings.

[0014] Step 8: Superimpose the deformation and settlement curve Y1 obtained in Step 6 and the design circular curve or quadratic parabola Y2 obtained in Step 7 in the reverse direction to obtain the actual reverse arch setting curve Y3.

[0015] Step 9: Perform the reverse arch construction of the precast beam pedestal according to the actual reverse arch setting curve Y3 obtained in Step 8.

[0016] Furthermore, in Step 1, the relevant technical parameters of the composite foundation reinforcement piles include the distribution, quantity, pile length, pile diameter, replacement ratio, and mix ratio of the composite foundation reinforcement piles.

[0017] Furthermore, in Step 3, the precast beam pedestal data includes the self-weight of the pedestal, the self-weight of the pedestal foundation, the self-weight of the enlarged foundation, the bottom area of the pedestal foundation, and the bottom area of the enlarged foundation.

[0018] Furthermore, in Step 2, the precast beam pedestal includes a pedestal main body, a pedestal foundation installed at the bottom end of the pedestal main body, and enlarged foundations installed at both ends of the bottom of the pedestal main body.

[0019] Furthermore, in Steps 1 to 9, the precast beam pedestal data, the relevant technical parameters of the composite foundation reinforcement piles, the self-weight of the beam slab, the load of the operators, and the load of the formwork and tools are input into the analysis and processing system. The analysis and processing system calculates the maximum stress on the foundation and the stress on the foundations at both ends of the precast beam pedestal, and based on the maximum stress on the foundation and the stress on the foundations at both ends of the precast beam pedestal, obtains the deformation and settlement curve Y1 of the precast beam pedestal on the soft soil foundation, and inputs the reverse arch design circular curve or quadratic parabola Y2.

[0020] Furthermore, the analysis and processing system includes:

[0021] An application processing APP, installed in the user's communication device, is used to extract the precast beam pedestal data, relevant technical parameters of the composite foundation reinforcement piles, the self-weight of the beam slab, the load of the operating personnel, and the load of the formwork and machinery and tools input by the user;

[0022] An analysis and processing terminal, which is used to calculate the maximum stress on the foundation and the stress on the foundations at both ends of the precast beam pedestal according to the input precast beam pedestal data, relevant technical parameters of the composite foundation reinforcement piles, the self-weight of the beam slab, the load of the operating personnel, and the load of the formwork and machinery and tools.

[0023] Further, in step five, the maximum stress on the foundation is calculated by the analysis and processing terminal, and the calculation formula for the maximum stress on the foundation is:

[0024] F1 = G1 + G2 + 2 * G3 + G4 + G5 + G6;

[0025] σ1 = F1 / (A1 + 2 * A2);

[0026] Wherein, F1 is the maximum load on the foundation;

[0027] G1 is the self-weight of the pedestal;

[0028] G2 is the self-weight of the pedestal foundation;

[0029] G3 is the self-weight of the enlarged foundation;

[0030] G4 is the self-weight of the beam slab;

[0031] G5 is the load of the operating personnel;

[0032] G6 is the load of the formwork and machinery and tools;

[0033] σ1 is the maximum stress on the foundation;

[0034] A1 is the bottom area of the pedestal foundation;

[0035] A2 is the bottom area of the enlarged foundation.

[0036] Further, in step five, the stress on the foundations at both ends of the precast beam pedestal is calculated by the analysis and processing terminal, and the calculation formula for the stress on the foundations at both ends of the precast beam pedestal is:

[0037] F2 = (G1 + G4) / 2 + G3;

[0038] σ2 = F2 / A2;

[0039] Wherein, F2 is the load on the foundations at both ends of the precast beam pedestal;

[0040] G1 is the self-weight of the pedestal;

[0041] G4 is the self-weight of the beam slab;

[0042] G3 is for increasing the self - weight of the foundation;

[0043] σ2 is the stress on the foundations at both ends of the precast beam pedestal;

[0044] A2 is the bottom area of the enlarged foundation.

[0045] Furthermore, the application processing APP is also used to input pictures or photos of the camber of the precast beam pedestal after construction.

[0046] Furthermore, the analysis and processing system further includes:

[0047] An alarm terminal, which is used to calculate the gap between the curve formed by the arc surface at the top of the camber of the precast beam pedestal and the actual camber setting curve Y3, so as to send an alarm message to the application processing APP when the gap between the curve formed by the arc surface at the top of the camber of the precast beam pedestal and the actual camber setting curve Y3 exceeds a preset value.

[0048] Compared with the prior art, the beneficial effects of the present invention are:

[0049] The present invention takes into account the maximum stress on the foundation and the stress on the foundations at both ends of the precast beam pedestal to analyze the possibility of foundation deformation and settlement, thereby reducing the error caused by setting the camber according to the design theoretical value or empirical parameter value, and improving the construction effect of subsequent beam slab installation and bridge deck paving.

[0050] The following will explain the present invention in detail in conjunction with the drawings and specific embodiments. Description of the Drawings

[0051] Figure 1 It is a setting curve graph of the precast beam pedestal and the camber of the precast beam pedestal of the present invention;

[0052] Figure 2 It is a structural schematic diagram of the precast beam pedestal of the present invention;

[0053] Figure 3 It is a structural schematic diagram of the analysis and processing system of the present invention.

[0054] In the figure: 10, pedestal main body; 12, pedestal foundation; 13, enlarged foundation; 14, analysis and processing system; 141, application processing APP; 142, analysis and processing terminal; 143, alarm terminal. Detailed Embodiments

[0055] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0056] It should be noted that when an element is referred to as being "fixedly provided on" another element, it can be directly on the other element or there can be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0058] For the embodiments, please refer to the attached Figures 1 to 3 , the present invention provides a method for setting the camber of a precast beam pedestal on soft soil foundation. The method includes the following steps:

[0059] Step 1: Conduct on-site investigations and collect data to obtain information on the geological conditions of the soft soil foundation layer, determine the scope of foundation reinforcement and treatment measures, obtain relevant technical parameters of the composite foundation reinforcement piles, and plan to adopt composite foundation reinforcement methods such as cement mixing piles, powder jet piles, and high-pressure jet grouting piles;

[0060] Step 2: Obtain the stress characteristics of the precast beam pedestal. Through three-dimensional finite element software, simulate and calculate the stress characteristics of the precast beam pedestal, the geological conditions information of the soft soil foundation layer obtained in Step 1, the relevant technical parameters of the composite foundation reinforcement piles, and determine the structural dimensions and steel bar structures of the precast beam pedestal;

[0061] Step 3: Obtain the data of the precast beam pedestal according to the structural dimensions and steel bar structures of the precast beam pedestal;

[0062] Step 4: Determine the self-weight of the beam slab, the load of the operating personnel, and the load of the formwork and tools according to the design drawings and empirical parameters;

[0063] Step 5: Calculate the maximum stress on the foundation and the stress on the foundation at both ends of the precast beam pedestal according to the data of the precast beam pedestal obtained in Step 3 and the self-weight of the beam slab, the load of the operating personnel, and the load of the formwork and tools obtained in Step 4;

[0064] Step 6: Based on the maximum stress calculated in Step 5 and the stress on the foundations at both ends of the precast beam pedestal, a three-dimensional numerical simulation is formed in combination with finite element software to obtain the deformation and settlement curve Y1 of the precast beam pedestal on the soft soil foundation;

[0065] Step 7: Obtain the reverse arch design circular curve or quadratic parabola Y2 according to the design drawings, or deduce the quadratic parabola Y2 according to the reverse camber value setting table in the design drawings;

[0066] Step 8: The deformation and settlement curve Y1 obtained in Step 6 and the design circular curve or quadratic parabola Y2 obtained in Step 7 are reversely superimposed to obtain the actual reverse arch setting curve Y3;

[0067] Step 9: Carry out the reverse arch construction of the precast beam pedestal according to the actual reverse arch setting curve Y3 obtained in Step 8.

[0068] Furthermore, in Step 3, the precast beam pedestal data includes the self-weight of the pedestal, the self-weight of the pedestal foundation, the self-weight of the enlarged foundation, the bottom area of the pedestal foundation, and the bottom area of the enlarged foundation;

[0069] Furthermore, in Step 2, the precast beam pedestal includes a pedestal main body 11, a pedestal foundation 12 installed at the bottom end of the pedestal main body 11, and enlarged foundations 13 installed at both ends of the bottom of the pedestal main body 11;

[0070] Furthermore, in Steps 1 to 9, the precast beam pedestal data, the relevant technical parameters of the composite foundation reinforcement piles, the self-weight of the beam slab, the load of the operating personnel, and the load of the formwork and construction machinery are input through the analysis and processing system 14. The analysis and processing system 14 calculates the maximum stress on the foundation and the stress on the foundations at both ends of the precast beam pedestal, and based on the maximum stress on the foundation and the stress on the foundations at both ends of the precast beam pedestal, the deformation and settlement curve Y1 of the precast beam pedestal on the soft soil foundation is obtained, and the reverse arch design circular curve or quadratic parabola Y2 is input;

[0071] Furthermore, the analysis and processing system 14 includes:

[0072] An application processing APP 141, installed in the user's communication device, for extracting the precast beam pedestal data, the relevant technical parameters of the composite foundation reinforcement piles, the self-weight of the beam slab, the load of the operating personnel, and the load of the formwork and construction machinery input by the user;

[0073] An analysis and processing terminal 142, for calculating the maximum stress on the foundation and the stress on the foundations at both ends of the precast beam pedestal according to the input precast beam pedestal data, the relevant technical parameters of the composite foundation reinforcement piles, the self-weight of the beam slab, the load of the operating personnel, and the load of the formwork and construction machinery;

[0074] Further, in the fifth step, the maximum stress on the foundation is calculated by the analysis and processing terminal 142. The calculation formula for the maximum stress on the foundation is as follows:

[0075] F1 = G1 + G2 + 2 * G3 + G4 + G5 + G6;

[0076] σ1 = F1 / (A1 + 2 * A2);

[0077] Wherein, F1 is the maximum load on the foundation;

[0078] G1 is the self - weight of the pedestal;

[0079] G2 is the self - weight of the pedestal foundation;

[0080] G3 is the self - weight of the enlarged foundation;

[0081] G4 is the self - weight of the beam slab;

[0082] G5 is the load of the operating personnel;

[0083] G6 is the load of the formwork and tools;

[0084] σ1 is the maximum stress on the foundation;

[0085] A1 is the bottom area of the pedestal foundation;

[0086] A2 is the bottom area of the enlarged foundation;

[0087] Further, in the fifth step, the stress on the foundations at both ends of the precast beam pedestal is calculated by the analysis and processing terminal 142. The calculation formula for the stress on the foundations at both ends of the precast beam pedestal is as follows:

[0088] F2 = (G1 + G4) / 2 + G3;

[0089] σ2 = F2 / A2;

[0090] Wherein, F2 is the load on the foundations at both ends of the precast beam pedestal;

[0091] G1 is the self - weight of the pedestal;

[0092] G4 is the self - weight of the beam slab;

[0093] G3 is the self - weight of the enlarged foundation;

[0094] σ2 is the stress on the foundations at both ends of the precast beam pedestal;

[0095] A2 is the bottom area of the enlarged foundation;

[0096] Further, the application processing APP141 is also used to input pictures or photos of the camber of the precast beam pedestal after construction, and take pictures at different construction stages of the camber of the precast beam pedestal. For example, when the camber of the precast beam pedestal is constructed to form an arc surface at the top of the orthographic projection of the precast beam pedestal;

[0097] Further, the analysis and processing system 14 further includes:

[0098] An alarm terminal 143, which is used to calculate the gap between the curve formed by the arc surface at the top of the camber of the precast beam pedestal and the actual camber setting curve Y3. When the gap between the curve formed by the arc surface at the top of the camber of the precast beam pedestal and the actual camber setting curve Y3 exceeds a preset value, an alarm message is sent to the application processing APP141. A coordinate system is established with one end of the curve formed by the orthographic projection of the arc surface at the top of the precast beam pedestal as the origin, and the area of the figure enclosed by the curve and the horizontal axis is calculated using calculus. Similarly, the area of the figure enclosed by the actual camber setting curve Y3 and the horizontal axis is calculated. The area obtained from the curve formed by the arc surface at the top of the precast beam pedestal is subtracted from the area obtained from the actual camber setting curve Y3, and the obtained value is compared with the preset value;

[0099] It should be noted that in this embodiment, the self-weight G1 of the pedestal = the length × width × height of the pedestal × the gravity density of concrete + ∑ the lengths of various types of steel bars × the number of roots × the weight per linear meter;

[0100] The self-weight G2 of the pedestal foundation = the length × width × height of the pedestal foundation × the gravity density of concrete + ∑ the lengths of various types of steel bars × the number of roots × the weight per linear meter;

[0101] The self-weight G3 of the enlarged foundation = the length × width × height of the enlarged foundation × the gravity density of concrete + ∑ the lengths of various types of steel bars × the number of roots × the weight per linear meter;

[0102] The bottom area A1 of the pedestal foundation = the length × width of the pedestal foundation;

[0103] The bottom area A2 of the enlarged foundation = the length × width of the enlarged foundation.

[0104] The specific operation method of the present invention is as follows:

[0105] On-site investigation and data collection to obtain information on the geological conditions of the soft soil foundation layer, determine the scope of foundation reinforcement and treatment measures, obtain relevant technical parameters of the composite foundation reinforcement piles, and plan to adopt composite foundation reinforcement methods such as cement mixing piles, powder jet piles, and high-pressure jet grouting piles;

[0106] Obtain the stress characteristics of the precast beam pedestal, and simulate and calculate the stress characteristics of the precast beam pedestal, the geological information of the soft soil foundation layer obtained in step 1, the relevant technical parameters of the composite foundation reinforcement piles, and the stress characteristics of the precast beam pedestal through three-dimensional finite element software to determine the structural dimensions and reinforcement structure of the precast beam pedestal;

[0107] According to the structural dimensions and reinforcement structure of the precast beam pedestal, the precast beam pedestal data is obtained, and according to the design drawings and empirical parameters, the beam and slab deadweight, operator load, and template and machine load are determined;

[0108] Based on the obtained precast beam pedestal data and the beam and slab deadweight, operator load, and template and equipment load obtained in step 4, the maximum stress on the foundation and the stress on the foundation at both ends of the precast beam pedestal are calculated;

[0109] According to the calculated maximum stress and the stress on the foundation at both ends of the precast beam pedestal, a three-dimensional numerical simulation is formed in combination with finite element software to obtain the deformation and settlement curve Y1 of the precast beam pedestal on the soft soil foundation;

[0110] Obtain the anti-arch design circular curve or quadratic parabola Y2 according to the design drawing, or derive the quadratic parabola Y2 according to the anti-pre-arch value setting table of the design drawing, and reversely superimpose the deformation settlement curve Y1 and the design circular curve or quadratic parabola Y2 to obtain the actual anti-arch setting curve Y3;

[0111] According to the actual counter-arch setting curve Y3, the counter-arch construction of the prefabricated beam pedestal is carried out.

[0112] Compared with the prior art, the present invention has the following beneficial effects:

[0113] The present invention takes into consideration the maximum stress on the foundation and the stress on the foundations at both ends of the prefabricated beam pedestal, so as to analyze the possibility of deformation and settlement of the foundation, thereby reducing the error caused by setting the anti-arch according to the design theoretical value or empirical parameter value, and improving the subsequent beam and slab installation and bridge deck paving construction effects.

[0114] The above is an exemplary description of the present invention in combination with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as such non-substantial improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A method for setting the camber of a precast beam pedestal on soft soil foundation, characterized in that, the method comprises the following steps: Step 1, conduct on-site investigation and data collection to obtain information on the geological conditions of the soft soil foundation layer, determine the scope of foundation reinforcement and treatment measures, obtain relevant technical parameters of the composite foundation reinforcement piles, and use cement mixing piles, dry jet mixing piles, and high-pressure jet grouting piles for composite foundation reinforcement; Step 2, obtain the stress characteristics of the precast beam pedestal. Through three-dimensional finite element software, simulate and calculate the stress characteristics of the precast beam pedestal, the geological conditions information of the soft soil foundation layer obtained in Step 1, the relevant technical parameters of the composite foundation reinforcement piles, and the stress characteristics of the precast beam pedestal to determine the structural dimensions and steel bar structures of the precast beam pedestal; Step 3, obtain the data of the precast beam pedestal according to the structural dimensions and steel bar structures of the precast beam pedestal; Step 4, determine the self-weight of the beam slab, the load of the operating personnel, and the load of the formwork and tools according to the design drawings and empirical parameters; Step 5, calculate the maximum stress on the foundation and the stress on the foundation at both ends of the precast beam pedestal according to the data of the precast beam pedestal obtained in Step 3 and the self-weight of the beam slab, the load of the operating personnel, and the load of the formwork and tools obtained in Step 4; Step 6, based on the maximum stress calculated in Step 5 and the stress on the foundation at both ends of the precast beam pedestal, form a three-dimensional numerical simulation in combination with the finite element software to obtain the deformation settlement curve Y1 of the precast beam pedestal on the soft soil foundation; Step 7, obtain the camber design circular curve or quadratic parabola Y2 according to the design drawings, or deduce the quadratic parabola Y2 according to the camber value setting table in the design drawings; Step 8, perform reverse superposition on the deformation settlement curve Y1 obtained in Step 6 and the design circular curve or quadratic parabola Y2 obtained in Step 7 to obtain the actual camber setting curve Y3; Step 9, carry out the camber construction of the precast beam pedestal according to the actual camber setting curve Y3 obtained in Step 8.

2. A method for setting the camber of a precast beam pedestal on soft soil foundation according to claim 1, characterized in that, in the said Step 1, the relevant technical parameters of the composite foundation reinforcement piles include the distribution, quantity, pile length, pile diameter, replacement ratio, and mix ratio of the composite foundation reinforcement piles.

3. A method for setting the camber of a precast beam pedestal on soft soil foundation according to claim 2, characterized in that, in the said Step 3, the data of the precast beam pedestal include the self-weight of the pedestal, the self-weight of the pedestal foundation, the self-weight of the enlarged foundation, the bottom area of the pedestal foundation, and the bottom area of the enlarged foundation.

4. A method for setting the camber of a precast beam pedestal on soft soil foundation according to claim 1, characterized in that, in the said Step 2, the precast beam pedestal includes a pedestal main body (11), a pedestal foundation (12) installed at the bottom end of the pedestal main body (11), and enlarged foundations (13) installed at both ends of the bottom of the pedestal main body (11).

5. A method for setting the camber of a precast beam pedestal on soft soil foundation according to claim 1, characterized in that, In Steps 1 to 9, the precast beam pedestal data, relevant technical parameters of the composite foundation reinforcement piles, the self-weight of the beam slab, the load of the operating personnel, and the load of the formwork and tools are input through the analysis and processing system (14). The analysis and processing system (14) calculates the maximum stress on the foundation and the stress on the foundations at both ends of the precast beam pedestal. And based on the maximum stress on the foundation and the stress on the foundations at both ends of the precast beam pedestal, the deformation settlement curve Y1 of the precast beam pedestal on the soft soil foundation is obtained, and the reverse arch design circular curve or quadratic parabola Y2 is input.

6. A method for setting the reverse arch of a precast beam pedestal on a soft soil foundation according to claim 5, characterized in that the analysis and processing system (14) includes: an application processing APP (141), installed in the user's communication device, for extracting the precast beam pedestal data, relevant technical parameters of the composite foundation reinforcement piles, the self-weight of the beam slab, the load of the operating personnel, and the load of the formwork and tools input by the user; an analysis and processing terminal (142), for calculating the maximum stress on the foundation and the stress on the foundations at both ends of the precast beam pedestal according to the input precast beam pedestal data, relevant technical parameters of the composite foundation reinforcement piles, the self-weight of the beam slab, the load of the operating personnel, and the load of the formwork and tools.

7. A method for setting the reverse arch of a precast beam pedestal on a soft soil foundation according to claim 1, characterized in that in Step 5, the maximum stress on the foundation is calculated by the analysis and processing terminal (142), and the calculation formula for the maximum stress on the foundation is: F1 = G1 + G2 + 2 * G3 + G4 + G5 + G6; σ1 = F1 / (A1 + 2 * A2); wherein, F1 is the maximum load on the foundation; G1 is the self-weight of the pedestal; G2 is the self-weight of the pedestal foundation; G3 is the self-weight of the enlarged foundation; G4 is the self-weight of the beam slab; G5 is the load of the operating personnel; G6 is the load of the formwork and tools; σ1 is the maximum stress on the foundation; A1 is the bottom area of the pedestal foundation; A2 is the bottom area of the enlarged foundation.

8. A method for setting the reverse arch of a precast beam pedestal on a soft soil foundation according to claim 1, characterized in that in Step 5, the stress on the foundations at both ends of the precast beam pedestal is calculated by the analysis and processing terminal (142), and the calculation formula for the stress on the foundations at both ends of the precast beam pedestal is: F2 = (G1 + G4) / 2 + G3; σ2 = F2 / A2; wherein, F2 is the load on the foundations at both ends of the precast beam pedestal; G1 is the self-weight of the pedestal; G4 is the self-weight of the beam slab; G3 is the self-weight of the enlarged foundation; σ2 is the stress on the foundations at both ends of the precast beam pedestal; A2 is the bottom area of the enlarged foundation.

9. A method for setting the reverse arch of a precast beam pedestal on a soft soil foundation according to claim 6, characterized in that the application processing APP (141) is further used for inputting pictures or photos of the reverse arch of the precast beam pedestal after construction.

10. A method for setting the reverse arch of a precast beam pedestal on a soft soil foundation according to claim 9, characterized in that the analysis and processing system (14) further includes: An alarm terminal (143) is used to calculate the gap between the curve formed by the top arc surface of the camber of the precast beam pedestal and the actual camber setting curve Y3, so as to send an alarm message to the application processing APP (141) when the gap between the curve formed by the top arc surface of the camber of the precast beam pedestal and the actual camber setting curve Y3 exceeds a preset value.

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