CN112052586A - Jacking force prediction method and jacking force prediction device - Google Patents
Jacking force prediction method and jacking force prediction device Download PDFInfo
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- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
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Abstract
The invention discloses a jacking force prediction method and a jacking force prediction device, and relates to the technical field of pipe jacking construction. The jacking force prediction method comprises the following steps: acquiring jacking force when each pipe joint is jacked respectively and finishing jacking force when jacking is finished respectively; calculating the additional jacking force of the (n-1) th pipe joint according to the jacking force of the (n-1) th pipe joint and the finished jacking force of the (n-2) th pipe joint, wherein n is an integer greater than or equal to 3; calculating the additional jacking force of the nth pipe joint according to the jacking force of the nth pipe joint and the finished jacking force of the (n-1) th pipe joint; calculating the theoretical jacking force difference of the (n + 1) th pipe joint according to the theoretical jacking force of the (n) th pipe joint and the theoretical jacking force of the (n + 1) th pipe joint; and calculating the predicted jacking force of the (n + 1) th pipe joint according to the finished jacking force of the (n + 1) th pipe joint, the theoretical jacking force difference of the (n-1) th pipe joint, the additional jacking force of the (n-1) th pipe joint and the additional jacking force of the n-1 th pipe joint. The prediction result of the jacking force prediction method provided by the invention is more accurate and reliable.
Description
Technical Field
The invention relates to the technical field of pipe jacking construction, in particular to a jacking force prediction method and a jacking force prediction device.
Background
In the jacking force construction process, jacking interruption is caused by over-low jacking force of the pipe jacking machine, and unnecessary waste of engineering cost is caused by over-high jacking force. Therefore, accurate prediction of the jacking force of the pipe jacking machine is very important in the construction process.
At present, the jacking force required by jacking a target pipe joint is predicted by adopting a theoretical formula or empirical formula calculation method in the market. The conventional formula calculation method does not consider the additional jacking force caused by construction factors such as construction pause, grouting lubrication and the like, and the calculated theoretical value has larger deviation from the actual value.
Disclosure of Invention
The invention aims to provide a jacking force prediction method which can predict the jacking force of a pipe joint more accurately.
Another object of the present invention is to provide a thrust force prediction device that can predict the thrust force of a pipe joint more accurately.
The invention provides a technical scheme that:
a jacking force prediction method is applied to the sequential jacking process of a plurality of pipe joints in pipe jacking construction, and comprises the following steps:
acquiring jacking force when each pipe joint is jacked respectively and finishing jacking force when jacking is finished respectively;
calculating the additional jacking force of the (n-1) th pipe joint according to the jacking force of the (n-1) th pipe joint and the finished jacking force of the (n-2) th pipe joint, wherein n is an integer greater than or equal to 3;
calculating the additional jacking force of the nth pipe joint according to the jacking force of the nth pipe joint and the finished jacking force of the (n-1) th pipe joint;
calculating the theoretical jacking force difference of the (n + 1) th pipe joint according to the theoretical jacking force of the (n) th pipe joint and the theoretical jacking force of the (n + 1) th pipe joint;
and calculating the predicted jacking force of the (n + 1) th pipe joint according to the finished jacking force of the (n + 1) th pipe joint, the theoretical jacking force difference of the (n-1) th pipe joint, the additional jacking force of the (n-1) th pipe joint and the additional jacking force of the n-1 th pipe joint.
Further, the step of calculating the predicted jacking force of the (n + 1) th pipe joint according to the finished jacking force of the (n) th pipe joint, the theoretical jacking force difference of the (n + 1) th pipe joint, the additional jacking force of the (n-1) th pipe joint and the additional jacking force of the n-1 th pipe joint comprises the following steps of:
according to the formula
Calculating the predicted jacking force of the (n + 1) th pipe joint, wherein Fn+1Denotes the predicted jacking force, N, of the (N + 1) th jointnDenotes a finished jacking force, Δ F ', of the n-th joint'n+1Represents the theoretical head force difference of the (N + 1) th pipe joint, delta NnDenotes the additional jacking force, Δ N, of the nth pipe jointn-1Showing the additional jacking force of the (n-1) th pipe joint.
Further, the step of calculating the additional jacking force of the (n-1) th pipe joint according to the jacking force of the (n-1) th pipe joint and the finished jacking force of the (n-2) th pipe joint comprises the following steps:
according to the formula: delta Nn-1＝N'n-1-Nn-2Calculating the additional jacking force of the (N-1) th pipe joint, wherein the additional jacking force is delta Nn-1An additional jacking force, N 'of the N-1 th joint'n-1Shows the jacking force of the (N-1) th pipe joint, Nn-2Showing the finished jacking force of the (n-2) th pipe joint.
Further, the step of calculating the additional jacking force of the nth pipe joint according to the jacking force of the nth pipe joint and the finished jacking force of the (n-1) th pipe joint comprises the following steps:
according to the formula: delta Nn＝N'n-Nn-1Calculating the additional jacking force of the nth pipe joint, wherein the additional jacking force is delta NnDenotes an additional jacking force, N 'of the N-th pipe joint'nIndicates the jacking force of the nth pipe joint, Nn-1Showing the finished jacking force of the (n-1) th pipe joint.
Further, the step of calculating the theoretical jacking force difference of the (n + 1) th pipe joint according to the theoretical jacking force of the nth pipe joint and the theoretical jacking force of the (n + 1) th pipe joint comprises the following steps:
calculating the theoretical jacking force of the nth pipe joint;
calculating the theoretical jacking force of the (n + 1) th pipe joint;
according to the formula delta F'n+1＝F'n+1-F’nCalculating the theoretical jacking force difference of the n +1 th pipe joint, wherein delta F'n+1Denotes the theoretical head force difference, F 'of the n +1 th pipe joint'n+1Denotes the theoretical jacking force, F 'of the n +1 th pipe joint'nThe theoretical jacking force of the nth pipe joint is shown.
Further, the step of calculating the theoretical jacking force of the nth pipe joint comprises the following steps:
according to formula F'n＝πDnLnfn+NFCalculating the theoretical jacking force of the nth pipe joint, wherein DnDenotes the outside diameter, L, of the nth pipe jointnExpressing the jacking length of the front n-joint pipe joint, fnRepresents the average frictional resistance per unit area between the outer wall of the front N-joint pipe joint and the soil layer, NFRepresenting the head-on resistance of the push bench.
Further, the step of calculating the theoretical jacking force of the (n + 1) th pipe joint comprises the following steps:
according to formula F'n+1＝πDn+1Ln+1fn+1+NFCalculating the theoretical jacking force of the (n + 1) th pipe joint, wherein Dn+1Denotes the outside diameter, L, of the (n + 1) th pipe jointn+1Denotes the jacking length of the front n +1 joint, fn+1Represents the average frictional resistance per unit area of the outer wall of the front N +1 tube joint and the soil layer, NFRepresenting the head-on resistance of the push bench.
The present invention also provides a jacking force predicting apparatus, including:
the acquisition module is used for acquiring the jacking force when each pipe joint is jacked respectively and the finish jacking force when the pushing is finished respectively;
the first calculation module is used for calculating the additional jacking force of the (n-1) th pipe joint according to the jacking force of the (n-1) th pipe joint and the finished jacking force of the (n-2) th pipe joint, wherein n is an integer greater than or equal to 3;
the second calculation module is used for calculating the additional jacking force of the nth pipe joint according to the jacking force of the nth pipe joint and the finished jacking force of the (n-1) th pipe joint;
the third calculation module is used for calculating the theoretical jacking force difference of the (n + 1) th pipe joint according to the theoretical jacking force of the nth pipe joint and the theoretical jacking force of the (n + 1) th pipe joint;
and the fourth calculation module is used for calculating the predicted jacking force of the (n + 1) th pipe joint according to the finished jacking force of the (n) th pipe joint, the theoretical jacking force difference of the (n + 1) th pipe joint, the additional jacking force of the (n-1) th pipe joint and the additional jacking force of the n-1 th pipe joint.
Compared with the prior art, the jacking force prediction method provided by the invention has the advantages that the jacking force when each pipe joint is jacked and the jacking force when each pipe joint is jacked are obtained in the jacking force construction process in an actual measurement mode, the additional jacking force caused by construction factors such as construction pause and grouting lubrication is further calculated, the theoretical jacking force is calculated, and the theoretical jacking force and the additional jacking force are combined to obtain the predicted jacking force of the target pipe joint. The method for predicting the jacking force eliminates the influence of the additional jacking force on the prediction result, and is more accurate and reliable. Therefore, the jacking force prediction method provided by the invention has the beneficial effects that: the prediction result is more accurate and reliable.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below. It is appreciated that the following drawings depict only certain embodiments of the invention and are therefore not to be considered limiting of its scope. For a person skilled in the art, it is possible to derive other relevant figures from these figures without inventive effort.
Fig. 1 is a block flow diagram of a method for predicting a jacking force according to a first embodiment of the present invention;
FIG. 2 is a block flow diagram of sub-steps of step S104 of FIG. 1;
fig. 3 is a block diagram of a jacking force predicting apparatus according to a second embodiment of the present invention.
Icon: 100-a jacking force predicting device; 110-an acquisition module; 120-a first calculation module; 130-a second calculation module; 140-a third calculation module; 150-a fourth calculation module.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "inside", "outside", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships that the products of the present invention are conventionally placed in use, or the orientations or positional relationships that are conventionally understood by those skilled in the art, and are used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is also to be noted that, unless otherwise explicitly stated or limited, the terms "disposed" and "connected" are to be interpreted broadly, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The following detailed description of embodiments of the invention refers to the accompanying drawings.
First embodiment
Fig. 1 is a flow chart of a jacking force prediction method provided in this embodiment, and the jacking force prediction method is applied to a sequential jacking process of multiple pipe joints in pipe jacking construction. Referring to fig. 1, the method for predicting the jacking force includes:
and step S101, acquiring jacking force when each pipe joint is jacked respectively and finishing jacking force when jacking is finished respectively.
In the process of pipe jacking construction, after the previous pipe joint is jacked by a pipe jacking machine, the next pipe joint is jacked. In the process, the output jacking force of the push bench in the process of jacking each push pipe respectively is collected, wherein the output jacking force comprises the jacking force when each pipe joint is jacked and the completed jacking force when each pipe joint completes jacking respectively. In this embodiment, the controller is electrically connected with the push bench to acquire data of the push bench in real time.
Further, the jacking force prediction method may further include:
and S102, calculating the additional jacking force of the (n-1) th pipe joint according to the jacking force of the (n-1) th pipe joint and the finished jacking force of the (n-2) th pipe joint, wherein n is an integer greater than or equal to 3.
According to the formula: delta Nn-1＝N'n-1-Nn-2Calculating the additional jacking force of the (N-1) th pipe joint, wherein the additional jacking force is delta Nn-1An additional jacking force, N 'of the N-1 th joint'n-1Shows the jacking force of the (N-1) th pipe joint, Nn-2Showing the finished jacking force of the (n-2) th pipe joint.
And obtaining an additional jacking force caused by construction factors such as construction pause and grouting lubrication before the n-1 section of pipe joint starts jacking when the n-2 section of pipe joint finishes jacking by calculating a difference value between the jacking force of the n-1 section of pipe joint and the finished jacking force of the n-2 section of pipe joint.
Further, the jacking force prediction method may further include:
and step S103, calculating the additional jacking force of the nth pipe joint according to the jacking force of the nth pipe joint and the finished jacking force of the (n-1) th pipe joint.
According to the formula: delta Nn＝N'n-Nn-1Calculating the additional jacking force of the nth pipe joint, wherein the additional jacking force is delta NnDenotes an additional jacking force, N 'of the N-th pipe joint'nIndicates the jacking force of the nth pipe joint, Nn-1Showing the finished jacking force of the (n-1) th pipe joint.
The difference value of the jacking force of the nth pipe joint and the finished jacking force of the nth-1 pipe joint is obtained, so that the additional jacking force caused by construction factors such as construction pause and grouting lubrication before the nth pipe joint starts jacking when the nth-1 pipe joint is jacked completely is obtained.
Further, the jacking force prediction method may further include:
and step S104, calculating the theoretical jacking force difference of the (n + 1) th pipe joint according to the theoretical jacking force of the (n) th pipe joint and the theoretical jacking force of the (n + 1) th pipe joint.
Referring to fig. 2, step S104 further includes the following sub-steps:
and a substep S1041 of calculating a theoretical jacking force of the nth pipe joint.
In the embodiment, the formula is F'n＝πDnLnfn+NFCalculating theoretical ejection force of the n-th pipe joint, wherein F'nRepresents the theoretical jacking force of the nth pipe joint, DnDenotes the outside diameter, L, of the nth pipe jointnExpressing the jacking length of the front n-joint pipe joint, fnThe average frictional resistance of the outer wall of the front N-joint pipe joint and the soil layer in unit area is shown and determined through tests, NFThe head-on resistance of the push bench is determined by the jacking mode of the push bench.
And a substep S1042 of calculating the theoretical jacking force of the (n + 1) th pipe joint.
In the embodiment, the formula is F'n+1＝πDn+1Ln+1fn+1+NFCalculating theoretical ejection force of the (n + 1) th pipe joint, wherein F'n+1Represents the theoretical jacking force of the (n + 1) th pipe joint, Dn+1Denotes the outside diameter, L, of the (n + 1) th pipe jointn+1Denotes the jacking length of the front n +1 joint, fn+1The average frictional resistance of the outer wall of the front N +1 tube joint and the soil layer in unit area is shown and determined through tests, and N isFThe head-on resistance of the push bench is determined by the jacking mode of the push bench.
Substep S1043, according to formula delta F'n+1＝F'n+1-F’nCalculating the theoretical jacking force difference of the n +1 th pipe joint, wherein delta F'n+1Representing the theoretical head force difference of the (n + 1) th pipe joint.
Taking into account the uniformity of the external diameter of the pipe sections during construction, i.e. Dn+1＝Dn＝D0，D0Represents the collective outside diameter of the plurality of pipe joints used in the pipe jacking construction of this time, and therefore,. DELTA.F'n+1＝πD0(Ln+1fn+1-Lnfn) In actual construction, in the case where the condition of the ground layer does not change much, fn+1Can be processed approximately, i.e.
That is, the average friction resistance per unit area of the (n + 1) th pipe joint can be obtained by averaging the average friction resistances per unit area of the two preceding pipe joints.
With reference to fig. 1, the method for predicting the jacking force may further include:
and step S105, calculating the predicted jacking force of the (n + 1) th pipe joint according to the finished jacking force of the (n) th pipe joint, the theoretical jacking force difference of the (n + 1) th pipe joint, the additional jacking force of the (n-1) th pipe joint and the additional jacking force of the n-1 th pipe joint.
According to the formula
Calculating the predicted jacking force of the (n + 1) th pipe joint, wherein Fn+1Denotes the predicted jacking force, N, of the (N + 1) th jointnIndicating the finished jacking force of the nth pipe joint.
Therefore, the temperature of the molten metal is controlled,
wherein n is an integer greater than or equal to 3.
In practical application, the jacking of the nth pipe joint is finished, and the predicted jacking force F of the (n + 1) th pipe joint is obtained by the jacking force prediction methodn+1Then, the maximum jacking force for jacking the (n + 1) th pipe joint of the pipe jacking machine is set to be Fn+1. And starting to push the (n + 1) th pipe section from zero, and gradually increasing the pushing force of the pipe pushing jack until the (n + 1) th pipe section is pushed to the preset pushing length from the beginning. In the process, the jacking force N 'of the (N + 1) th pipe joint is collected'n+1And completing the jacking force Nn+1Thereby to apply a jacking force N 'to the (N + 1) -th pipe joint'n+1And the finished jacking force N of the nth pipe jointnCalculating the difference value to obtain the additional jacking force delta N of the (N + 1) th pipe jointn+1. Calculating theoretical ejection force F 'of the (n + 2) th pipe joint'n+2And the theoretical ejection force F 'of the (n + 1) th pipe joint'n+1Obtaining the theoretical jacking force difference delta F 'of the n +2 pipe joint by difference'n+2。
Further, by the formula:
the prediction of the jacking force of the (n + 2) th pipe joint can be realized.
In summary, the embodiment provides a jacking force prediction method, which can perform more accurate and reliable prediction on the jacking force of the rear pipe joint by respectively monitoring and collecting the jacking force and the finished jacking force in the process of jacking the previous pipe joint and combining with a theoretical formula for calculation, and uses the prediction result as the upper limit of the jacking force of the next jacking pipe machine, so as to ensure smooth jacking of the rear pipe joint and save construction cost.
Second embodiment
Referring to fig. 3, the present embodiment provides a jacking force predicting apparatus 100, including:
and the acquisition module 110 is used for acquiring the jacking force when each pipe joint is jacked respectively and the finish jacking force when each pipe joint finishes pushing respectively.
The acquisition module 110 is electrically connected with the push bench and can acquire the push-up force data of the push bench in real time. In the process that the pipe jacking machine jacks a plurality of pipe joints in sequence, the acquisition module 110 can acquire the jacking force when each jacked pipe joint is jacked and the finish jacking force when pushing is finished in sequence.
The first calculation module 120 is configured to calculate an additional jacking force of the (n-1) th pipe joint according to the jacking force of the (n-1) th pipe joint and the completed jacking force of the (n-2) th pipe joint, where n is an integer greater than or equal to 3.
The first calculation module 120 follows the formula: delta Nn-1＝N'n-1-Nn-2Calculating the additional jacking force of the (N-1) th pipe joint, wherein the additional jacking force is delta Nn-1An additional jacking force, N 'of the N-1 th joint'n-1Shows the jacking force of the (N-1) th pipe joint, Nn-2Showing the finished jacking force of the (n-2) th pipe joint.
And the second calculating module 130 is configured to calculate an additional jacking force of the nth pipe joint according to the jacking force of the nth pipe joint and the finished jacking force of the (n-1) th pipe joint.
The second calculation module 130 follows the formula: delta Nn＝N'n-Nn-1Calculating the additional jacking force of the nth pipe joint, wherein the additional jacking force is delta NnDenotes an additional jacking force, N 'of the N-th pipe joint'nIndicates the jacking force of the nth pipe joint, Nn-1Showing the finished jacking force of the (n-1) th pipe joint.
And the third calculating module 140 is configured to calculate the theoretical jacking force difference of the (n + 1) th pipe joint according to the theoretical jacking force of the nth pipe joint and the theoretical jacking force of the (n + 1) th pipe joint.
The third calculation module 140 is according to formula F'n＝πDnLnfn+NFCalculating the theoretical jacking force of the nth pipe joint, wherein DnDenotes the outside diameter, L, of the nth pipe jointnExpressing the jacking length of the front n-joint pipe joint, fnThe average frictional resistance of the outer wall of the front N-joint pipe joint and the soil layer in unit area is shown and determined through tests, NFThe head-on resistance of the push bench is determined by the jacking mode of the push bench. And according to a formula F'n+1＝πDn+1Ln+1fn+1+NFCalculating the theoretical jacking force of the (n + 1) th pipe joint, wherein Dn+1Denotes the outside diameter, L, of the (n + 1) th pipe jointn+1Denotes the jacking length of the front n +1 joint, fn+1Unit for representing outer wall and soil layer of front n +1 tube jointArea average frictional resistance, determined by experiment, NFThe head-on resistance of the push bench is determined by the jacking mode of the push bench. After the theoretical jacking force of the n-th pipe joint and the theoretical jacking force of the n + 1-th pipe joint are respectively calculated, the formula delta F 'is adopted'n+1＝F'n+1-F’nCalculating the theoretical jacking force difference of the n +1 th pipe joint, wherein delta F'n+1Representing the theoretical head force difference of the (n + 1) th pipe joint.
And the fourth calculating module 150 is configured to calculate the predicted jacking force of the (n + 1) th pipe joint according to the finished jacking force of the (n + 1) th pipe joint, the theoretical jacking force difference of the (n-1) th pipe joint, the additional jacking force of the (n-1) th pipe joint, and the additional jacking force of the (n) th pipe joint.
The fourth calculation module 150 is based on the formula
Calculating the predicted jacking force of the (n + 1) th pipe joint, wherein Fn+1Denotes the predicted jacking force, N, of the (N + 1) th jointnIndicating the finished jacking force of the nth pipe joint.
Therefore, the jacking force prediction device 100 provided in this embodiment can perform more accurate and reliable prediction on the jacking force of the rear pipe joint by monitoring and acquiring the jacking force and the completed jacking force of the previous pipe joint in the jacking process respectively and calculating by combining a theoretical formula, and the prediction result is used as the upper limit of the jacking force of the next jacking of the pipe jacking machine, so that smooth jacking of the rear pipe joint is ensured, and the construction cost is saved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A jacking force prediction method is applied to the sequential jacking process of a plurality of pipe joints in pipe jacking construction, and is characterized by comprising the following steps:
acquiring jacking force when each pipe joint is jacked respectively and finishing jacking force when jacking is finished respectively;
calculating the additional jacking force of the (n-1) th pipe joint according to the jacking force of the (n-1) th pipe joint and the finished jacking force of the (n-2) th pipe joint, wherein n is an integer greater than or equal to 3;
calculating the additional jacking force of the nth pipe joint according to the jacking force of the nth pipe joint and the finished jacking force of the (n-1) th pipe joint;
calculating the theoretical jacking force difference of the (n + 1) th pipe joint according to the theoretical jacking force of the (n) th pipe joint and the theoretical jacking force of the (n + 1) th pipe joint;
and calculating the predicted jacking force of the (n + 1) th pipe joint according to the finished jacking force of the (n + 1) th pipe joint, the theoretical jacking force difference of the (n-1) th pipe joint, the additional jacking force of the (n-1) th pipe joint and the additional jacking force of the n-1 th pipe joint.
2. The jacking force prediction method according to claim 1, wherein the step of calculating the predicted jacking force of the (n + 1) th pipe joint based on the finished jacking force of the (n + 1) th pipe joint, the theoretical jacking force difference of the (n + 1) th pipe joint, the additional jacking force of the (n-1) th pipe joint, and the additional jacking force of the (n) th pipe joint comprises:
according to the formula
Calculating the predicted jacking force of the (n + 1) th pipe joint, wherein Fn+1Denotes the predicted jacking force, N, of the (N + 1) th jointnDenotes a finished jacking force, Δ F ', of the n-th joint'n+1Represents the theoretical head force difference of the (N + 1) th pipe joint, delta NnDenotes the additional jacking force, Δ N, of the nth pipe jointn-1Showing the additional jacking force of the (n-1) th pipe joint.
3. The method for predicting the jacking force according to claim 1, wherein the step of calculating the additional jacking force of the (n-1) th pipe joint according to the jacking force of the (n-1) th pipe joint and the finished jacking force of the (n-2) th pipe joint comprises the steps of:
according to the formula: delta Nn-1＝N'n-1-Nn-2Calculating the additional jacking force of the (N-1) th pipe joint, wherein the additional jacking force is delta Nn-1Showing additional jacking force of the (n-1) th pipe joint，N'n-1Shows the jacking force of the (N-1) th pipe joint, Nn-2Showing the finished jacking force of the (n-2) th pipe joint.
4. The method according to claim 1, wherein the step of calculating the additional top force of the nth pipe joint based on the top dynamic top force of the nth pipe joint and the finished top force of the (n-1) th pipe joint comprises:
according to the formula: delta Nn＝N'n-Nn-1Calculating the additional jacking force of the nth pipe joint, wherein the additional jacking force is delta NnDenotes an additional jacking force, N 'of the N-th pipe joint'nIndicates the jacking force of the nth pipe joint, Nn-1Showing the finished jacking force of the (n-1) th pipe joint.
5. A jacking force prediction method according to claim 1, wherein the step of calculating the theoretical jacking force difference of the (n + 1) th pipe joint from the theoretical jacking force of the (n) th pipe joint and the theoretical jacking force of the (n + 1) th pipe joint comprises:
calculating the theoretical jacking force of the nth pipe joint;
calculating the theoretical jacking force of the (n + 1) th pipe joint;
according to the formula delta F'n+1＝F'n+1-F’nCalculating the theoretical jacking force difference of the n +1 th pipe joint, wherein delta F'n+1Denotes the theoretical head force difference, F 'of the n +1 th pipe joint'n+1Denotes the theoretical jacking force, F 'of the n +1 th pipe joint'nThe theoretical jacking force of the nth pipe joint is shown.
6. A jacking force prediction method as claimed in claim 5, wherein said step of calculating the theoretical jacking force of the nth pipe segment comprises:
according to formula F'n＝πDnLnfn+NFCalculating the theoretical jacking force of the nth pipe joint, wherein DnDenotes the outside diameter, L, of the nth pipe jointnExpressing the jacking length of the front n-joint pipe joint, fnRepresents the average frictional resistance per unit area between the outer wall of the front N-joint pipe joint and the soil layer, NFRepresenting the head-on resistance of the push bench.
7. The jacking force prediction method according to claim 5, wherein the step of calculating the theoretical jacking force of the (n + 1) th pipe joint comprises:
according to formula F'n+1＝πDn+1Ln+1fn+1+NFCalculating the theoretical jacking force of the (n + 1) th pipe joint, wherein Dn+1Denotes the outside diameter, L, of the (n + 1) th pipe jointn+1Denotes the jacking length of the front n +1 joint, fn+1Represents the average frictional resistance per unit area of the outer wall of the front N +1 tube joint and the soil layer, NFRepresenting the head-on resistance of the push bench.
8. A jacking force predicting device, comprising:
the acquisition module is used for acquiring the jacking force when each pipe joint is jacked respectively and the finish jacking force when the pushing is finished respectively;
the first calculation module is used for calculating the additional jacking force of the (n-1) th pipe joint according to the jacking force of the (n-1) th pipe joint and the finished jacking force of the (n-2) th pipe joint, wherein n is an integer greater than or equal to 3;
the second calculation module is used for calculating the additional jacking force of the nth pipe joint according to the jacking force of the nth pipe joint and the finished jacking force of the (n-1) th pipe joint;
the third calculation module is used for calculating the theoretical jacking force difference of the (n + 1) th pipe joint according to the theoretical jacking force of the nth pipe joint and the theoretical jacking force of the (n + 1) th pipe joint;
and the fourth calculation module is used for calculating the predicted jacking force of the (n + 1) th pipe joint according to the finished jacking force of the (n) th pipe joint, the theoretical jacking force difference of the (n + 1) th pipe joint, the additional jacking force of the (n-1) th pipe joint and the additional jacking force of the n-1 th pipe joint.
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