A method for determining the horizontal misalignment between segment rings during prefabricated caisson construction

Abstract

This invention discloses a method for determining the horizontal misalignment between segments during the construction of prefabricated caissons, comprising: obtaining the unit weight γ of each soil layer. i The thickness h of each soil layer i The internal friction angle of soil layer i on the outer sidewall of the caisson and the cohesion c of each soil layer. i ; Calculate the active earth pressure coefficient K of each soil layer based on the internal friction angle of soil layer i on the outer sidewall of the caisson. ai ; Calculate the earth pressure intensity p at the top of the upper segment above the bolt. au1 Earth pressure intensity p at the bottom of the upper segment of the bolt au2 Earth pressure intensity p of the lower segment ad Based on the earth pressure strength p of the upper segment of the bolt. au Earth pressure strength p of the lower segment ad Calculation of the height L of a single segment and the force V exerted by the bolts on the upper segment. au The force V acting on the lower segment by the bolts ad According to the force V exerted by the bolt on the upper segment au The force V acting on the lower segment by the bolts ad Calculate the uniformly distributed load q on the bolt; calculate the horizontal misalignment w between the segment rings based on the uniformly distributed load q on the bolt. This enables accurate measurement of the horizontal misalignment between the segment rings.

Description

Technical Field

[0001] This invention relates to the field of measuring the horizontal misalignment between segments during the construction of prefabricated caissons, and particularly to a method for measuring the horizontal misalignment between segments during the construction of prefabricated caissons. Background Technology

[0002] Caisson structures are widely used in underground space engineering due to their advantages such as good integrity, high load-bearing capacity, and small construction footprint. However, the caissons currently used in engineering projects are usually cast-in-place reinforced concrete caissons, which involve a large amount of on-site work, a long construction period, and a significant impact on urban roads and surrounding residents. Therefore, some experts and scholars, based on engineering practice, have proposed the construction method of prefabricated caissons. Compared with cast-in-place reinforced concrete caissons, prefabricated caissons are assembled from factory-prefabricated reinforced concrete segments, with adjacent segments fixed together by bolts, effectively shortening the construction period and reducing the impact on surrounding residents and urban roads.

[0003] However, during the construction of prefabricated caissons, the sidewalls are subjected to earth pressure, which can cause deformation of the bolts connecting the segments, leading to horizontal misalignment between the segments. Furthermore, if the horizontal misalignment between each ring of segments is too large, it will cause unreasonable stress on the caisson structure, ultimately resulting in the failure of the entire caisson structure. In summary, ensuring that the horizontal misalignment between the rings of the caisson structure segments meets construction requirements is crucial. However, to date, there is still no simple and quick method to determine the horizontal misalignment between the rings of prefabricated caisson segments. Summary of the Invention

[0004] The main objective of this invention is to provide a method for determining the horizontal misalignment between segments during the construction of prefabricated caissons. This method can calculate the magnitude of the horizontal misalignment between each ring of segments during the construction of prefabricated caissons. It has the advantages of simple process and reliable results, and effectively avoids construction problems caused by excessive horizontal misalignment between segments.

[0005] To solve the above-mentioned technical problems, the present invention provides a method for determining the horizontal misalignment between segment rings during the construction of prefabricated caissons, comprising:

[0006] Obtain the unit weight γ of each soil layer i The thickness h of each soil layer i The internal friction angle of soil layer i on the outer sidewall of the caisson The cohesion of each soil layer c i ;

[0007] Based on the internal friction angle of soil layer i on the outer sidewall of the caisson Calculate the active earth pressure coefficient K for each soil layer ai ;

[0008] Based on the unit weight γ of each soil layeri The thickness h of each soil layer i The cohesion of each soil layer c i Active earth pressure coefficient K for each soil layer ai Calculate the earth pressure intensity p at the top of the upper segment of the bolt. au1 Earth pressure intensity p at the bottom of the upper segment of the bolt au2 Earth pressure intensity p of the lower segment ad ;

[0009] Based on the earth pressure strength p of the upper segment of the bolt au Earth pressure strength p of the lower segment ad Calculation of the height L of a single segment and the force V exerted by the bolts on the upper segment. au The force V acting on the lower segment by the bolts ad ;

[0010] According to the force V exerted by the bolt on the upper segment au The force V acting on the lower segment by the bolts ad Calculate the uniformly distributed load q on the bolt;

[0011] The horizontal misalignment w between the segments is calculated based on the uniformly distributed load q on the bolt.

[0012] Furthermore, the unit weight γ of each soil layer i The thickness h of each soil layer i The internal friction angle of soil layer i on the outer sidewall of the caisson The cohesion of each soil layer c i Obtained through actual engineering survey reports.

[0013] Furthermore, the active earth pressure coefficient of each soil layer

[0014] Furthermore, the method based on the unit weight γ of each soil layer i The thickness h of each soil layer i The cohesion of each soil layer c i Active earth pressure coefficient K for each soil layer ai Calculate the earth pressure strength p of the upper segment of the bolt. au Earth pressure intensity p of the lower segment ad include:

[0015] Obtain the perimeter U of the outer wall of the caisson and the total number n of bolts between the caisson rings;

[0016] Based on the unit weight γ of each soil layer above the top of the upper segment of the bolt. u1i The height h of each soil layer above the top of the upper segment of the bolt u1i The active earth pressure coefficient K of the soil layer where the upper part of the pipe segment is located. au1 The cohesion c of the soil layer at the top of the upper segment of the boltu1 Calculate the earth pressure intensity p at the top of the upper segment of the bolt. au1 ;

[0017] Based on the unit weight γ of each soil layer above the bottom of the upper segment of the bolt. u2i The height h of each soil layer above the bottom of the upper segment of the bolt u2i The active earth pressure coefficient K of the soil layer at the bottom of the upper segment of the bolt au2 The cohesion c of the soil layer at the bottom of the upper segment of the bolt u2 Calculate the earth pressure intensity p at the bottom of the upper segment above the bolt. au2 ;

[0018] Based on the unit weight γ of each soil layer above the bottom of the lower segment of the bolt. di The height h of each soil layer above the bottom of the bolted segment di The active earth pressure coefficient K of the soil layer at the bottom of the bolted segment ad The cohesion c of the soil layer at the bottom of the bolted segment d Calculate the earth pressure intensity p of the lower segment. ad .

[0019] Furthermore, the earth pressure intensity at the top of the upper segment of the bolt.

[0020] Earth pressure intensity at the bottom of the upper segment of the bolt

[0021] Earth pressure intensity of the lower segment

[0022] Furthermore, the earth pressure strength p of the upper segment of the bolt is... au Earth pressure strength p of the lower segment ad Calculation of the height L of a single segment and the force V exerted by the bolts on the upper segment. au The force V acting on the lower segment by the bolts ad include:

[0023] Based on the unit weight γ of the soil layer above the bottom of the upper segment of the bolt i The active earth pressure coefficient K of the soil layer at the bottom of the upper segment of the bolt ai The cohesion c of the soil layer at the bottom of the upper segment of the bolt i Calculate the critical depth z0, the critical depth Wherein, the critical depth z0 is located on segment m. If z0 is located in the segment closest to the upper part of the bolt, then the force exerted by the bolt on the upper segment is...

[0024] If the critical depth z0 is not located in the segment closest to the upper part of the bolt, the force exerted by the bolt on the upper segment...

[0025] The force exerted by the bolt on the lower segment

[0026] Furthermore, the critical depth

[0027] Furthermore, the force V acting on the upper segment by the bolt... au The force V acting on the lower segment by the bolts ad The calculation of the uniformly distributed load q on the bolt includes:

[0028] Obtain the bolt length l;

[0029] The uniformly distributed load

[0030] Furthermore, the calculation of the horizontal misalignment w between the segment rings based on the uniformly distributed load q on the bolts includes:

[0031] The moment of inertia I of the bolt section is calculated based on the bolt section diameter d.

[0032] Obtain the elastic modulus E of the bolt;

[0033] The horizontal misalignment between the segments

[0034] Furthermore, the elastic modulus E and the bolt cross-sectional diameter d of the bolt are obtained by using parameters corresponding to the bolt model used in actual engineering.

[0035] The beneficial effects of this invention are:

[0036] Firstly, survey data can be quickly obtained regarding the surrounding environment of the caisson construction. Using relevant soil layer data, the active pressure coefficient of each soil layer can be directly calculated. Then, the soil pressure intensity of the upper and lower segments above the bolt can be directly calculated using these active pressure coefficients. Finally, the force exerted by the bolt on the upper and lower segments can be directly calculated using the soil pressure intensity, thus obtaining the uniformly distributed load on the bolt. This uniformly distributed load allows for the accurate calculation of the horizontal misalignment between the upper and lower segments above the bolt.

[0037] Secondly, the horizontal displacement between adjacent ring segments can directly indicate the degree of offset between adjacent segments. The magnitude of the offset can be used to determine problems in the caisson construction process. If the offset is too large, an early warning can be issued immediately, and reconstruction can be carried out to avoid subsequent construction accidents. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a flowchart of the method of the present invention.

[0040] Figure 2 This is a diagram showing the distribution of active earth pressure intensity in a caisson.

[0041] Figure 3 This is a schematic diagram of the force applied to the bolt.

[0042] Figure 4 This is a schematic diagram of the horizontal displacement between the first segment rings of the caisson.

[0043] Figure 5 This is a schematic diagram of the horizontal misalignment between the intermediate segments of the caisson.

[0044] Figure 6 A simplified diagram for calculating the stress on the bolts between the rings of the caisson segments.

[0045] Figure 7 This is a diagram showing the arrangement of the segments in the caisson ring. Detailed Implementation

[0046] To facilitate understanding by those skilled in the art, the structure of the present invention will now be described in further detail with reference to the accompanying drawings. It should be understood that, unless otherwise specified, the order of the steps mentioned in this embodiment can be adjusted according to actual needs, and they can even be executed simultaneously or partially simultaneously.

[0047] like Figure 1 As shown, this invention provides a method for determining the horizontal misalignment between segment rings during the construction of prefabricated caissons, comprising:

[0048] S1 obtains the unit weight γ of each soil layer. i The thickness h of each soil layer i The internal friction angle of soil layer i on the outer sidewall of the caisson The cohesion of each soil layer c i ;

[0049] In this step, such as Figure 2 As shown, the unit weight γ of each soil layer i The thickness h of each soil layer i The internal friction angle of soil layer i on the outer sidewall of the caisson The cohesion of each soil layer c iThe internal friction angle was obtained from the actual engineering survey report. This angle is a soil parameter obtained through triaxial tests and cannot be shown in the figure. If the soil layer is below the groundwater level, the unit weight in the above calculations must be calculated using the buoyant unit weight γ', where γ' = γ - γ w , where γ w γ is the unit weight of water, and γ is the unit weight of soil.

[0050] S2 is based on the internal friction angle of the soil layer i on the outer sidewall of the caisson. Calculate the active earth pressure coefficient K for each soil layer a i;

[0051] In this step, the active earth pressure coefficient of each soil layer It is an essential parameter for calculating the active earth pressure intensity of each soil layer. The active earth pressure coefficient of each soil layer can be directly calculated based on the parameters obtained from the engineering survey report, which facilitates the subsequent calculation of earth pressure intensity.

[0052] S3 is based on the unit weight γ of each soil layer. i The thickness h of each soil layer i The cohesion of each soil layer c i Active earth pressure coefficient K for each soil layer ai Calculate the earth pressure intensity p at the top of the upper segment of the bolt. au1 Earth pressure intensity p at the bottom of the upper segment of the bolt au2 Earth pressure intensity p of the lower segment ad ;

[0053] S301 obtains the perimeter U of the outer wall of the caisson and the total number of bolts n between the caisson rings;

[0054] S302 is based on the unit weight γ of each soil layer above the top of the upper segment of the bolt. u1i The height h of each soil layer above the top of the upper segment of the bolt u1i The active earth pressure coefficient K of the soil layer where the upper part of the pipe segment is located. au1 The cohesion c of the soil layer at the top of the upper segment of the bolt u1 Calculate the earth pressure intensity p at the top of the upper segment of the bolt. au1 Earth pressure strength at the top of the upper segment of the bolt.

[0055] S303 is based on the unit weight γ of each soil layer above the bottom of the upper segment of the bolt. u2i The height h of each soil layer above the bottom of the upper segment of the bolt u2i The active earth pressure coefficient K of the soil layer at the bottom of the upper segment of the bolt au2 The cohesion c of the soil layer at the bottom of the upper segment of the bolt u2 Calculate the earth pressure intensity p at the bottom of the upper segment above the bolt. au2Earth pressure strength at the bottom of the upper segment of the bolt.

[0056] S304 is based on the unit weight γ of each soil layer above the bottom of the lower segment of the bolt. di The height h of each soil layer above the bottom of the bolted segment di The active earth pressure coefficient K of the soil layer at the bottom of the bolted segment ad The cohesion c of the soil layer at the bottom of the bolted segment d Calculate the earth pressure intensity p of the lower segment. ad Earth pressure intensity of the lower segment.

[0057] In this step, since this method is applicable to both cohesive and non-cohesive soils, Rankine's earth pressure theory is more suitable for this method, and the wall tends to shift away from the soil during the caisson process, this method uses the active earth pressure strength formula in Rankine's earth pressure theory for calculation.

[0058] S4 is based on the earth pressure strength p of the upper segment of the bolt. au Earth pressure strength p of the lower segment ad Calculation of the height L of a single segment and the force V exerted by the bolts on the upper segment. au The force V acting on the lower segment by the bolts ad ;

[0059] S401 Based on the unit weight γ of the soil layer above the bottom of the upper segment of the bolt. i The active earth pressure coefficient K of the soil layer at the bottom of the upper segment of the bolt ai The cohesion c of the soil layer at the bottom of the upper segment of the bolt i Calculate the critical depth z0, the critical depth Wherein, the critical depth z0 is located on segment m. If z0 is located in the segment closest to the upper part of the bolt, then the force exerted by the bolt on the upper segment is...

[0060] S402 If the critical depth z0 is not located in the segment closest to the upper part of the bolt, then the force exerted by the bolt on the upper segment is...

[0061] The force exerted by the bolts on the lower segment as described in S403

[0062] In this step, the height L of a single segment is obtained from the caisson design data. The number of segments is determined based on the number of segments above the bolts. If the outer side of the segment is cohesive soil, the Rankine earth pressure strength formula includes negative lateral pressure caused by cohesion. However, this formula requires neglecting the negative pressure at the top; therefore, the critical depth needs to be calculated before the earth pressure strength can be determined. The bolt forces of both the upper and lower segments are calculated as a resultant force. The bolt forces are calculated by treating both ends of the segment as simply supported beams and taking moments about the bolt end. Figure 3 As shown. Figure 4 As shown, if z0 is located in the segment closest to the bolt, there is earth pressure at the bottom of the segment above the bolt, while the earth pressure at the critical depth is 0; Figure 5 As shown, if the critical depth z0 is not located in the nearest segment above the bolt, there is soil pressure intensity at both the top and bottom of the segment above the bolt.

[0063] S5 is based on the force V exerted by the bolt on the upper segment. au The force V acting on the lower segment by the bolts ad Calculate the uniformly distributed load q on the bolt;

[0064] S501 obtains the bolt length l;

[0065] S502 Uniformly distributed load

[0066] In this step, such as Figure 6 As shown, a uniformly distributed load is a force (load) that is evenly distributed on the structure. Under a uniformly distributed load, the load on each point is equal. Bolts are slender rods, therefore, the calculation is based on a uniformly distributed load.

[0067] S6 calculates the horizontal misalignment w between the segment rings based on the uniformly distributed load q on the bolt.

[0068] S601 calculates the moment of inertia I of the bolt section based on the bolt section diameter d.

[0069] S602 obtains the elastic modulus E of the bolt;

[0070] S603 Horizontal misalignment between segments

[0071] In this step, the elastic modulus E and bolt cross-sectional diameter d of the bolt are obtained using parameters corresponding to the bolt type used in actual engineering. The uniformly distributed load q is calculated using various earth pressure intensities in the horizontal direction of the bolt, such as... Figure 6 As shown, the bolt is considered as a rod with one end fixed and the other end free. This is then analyzed using a uniformly distributed load q combined with the displacement formula. The displacement of the free end is calculated as the slip.

[0072] The invention will be further explained with reference to specific construction cases.

[0073] The caisson of a certain project has an excavation depth of 45m, an inner diameter of 12.6m, and an outer diameter of 13.0m. The caisson adopts a prefabricated caisson. In order to ensure that the horizontal misalignment between the caisson segments meets the requirements during construction, the method of the present invention is used to determine the horizontal misalignment between the caisson segments during construction.

[0074] According to the caisson design data, the perimeter of the caisson sidewall is U = 81.68m, the height of a single segment is L = 1.5m, one ring of segments has n = 36 bolts, the bolts are M60, the elastic modulus is E = 210GPa, the bolt cross-sectional diameter is d = 60.00mm, the bolt length is l = 720mm, and the moment of inertia is I = 636172.51mm. 4 .

[0075] According to the survey data, the conditions of each soil layer are as follows:

[0076] Sand fill thickness h1=5m, unit weight γ1=18KN / m3, internal friction angle Cohesion c1 = 3 kPa, active earth pressure K a1 =0.26;

[0077] Backfill silt thickness h2=3m, unit weight γ2=17KN / m3, internal friction angle Cohesion c2 = 11.3 kPa, active earth pressure K a2 =0.92;

[0078] The thickness of the plain fill is h3 = 10m, the unit weight is γ3 = 18.5KN / m3, and the internal friction angle is... Cohesion c3 = 10 kPa, active earth pressure K a3 =0.65;

[0079] The silty soil has a thickness h4 = 3m, a unit weight γ4 = 16.5 kN / m3, and an internal friction angle of 0.5 kN / m3. Cohesion c4 = 9.3 kPa, active earth pressure K a4 =0.91;

[0080] Coarse sand thickness h5 = 10m, unit weight γ5 = 19KN / m3, internal friction angle The angle is 28.0°, the cohesion c5 = 3 kPa, and the active earth pressure K a5 =0.36;

[0081] The residual sandy clay layer has a thickness of h6 = 9m, a unit weight of γ6 = 18 kN / m3, and an internal friction angle of φ6. Cohesion c6 = 27.4 kPa, active earth pressure K a6 =0.45;

[0082] The completely weathered granite has a thickness h7 = 20m, a unit weight γ7 = 19.5KN / m3, and an internal friction angle of [missing information]. Cohesion c7 = 30 kPa, active earth pressure K a7 =0.39;

[0083] The groundwater level is 3 meters deep.

[0084] Taking a caisson sinking 21m as an example, the calculation is as follows: when the caisson sinks 21m, if... Figure 7 As shown, the segments are arranged from top to bottom, and the connections between the segments in each ring are also arranged from top to bottom.

[0085] Calculations yielded Located on the first segment, the calculation yields:

[0086] Earth pressure strength at the bottom of the upper segment of the first connection bolt

[0087] Earth pressure intensity at the bottom of the lower segment

[0088] The force of the bolts on the upper segment

[0089] The force of the bolts on the upper segment

[0090] Uniformly distributed load on bolts

[0091] Horizontal misalignment between segments

[0092] Earth pressure strength at the top of the upper segment of the bolt at the second connection point

[0093] Earth pressure intensity at the bottom of the upper segment

[0094] Earth pressure intensity at the bottom of the lower segment

[0095] The force of the bolts on the upper segment

[0096] The force of the bolts on the upper segment

[0097] Uniformly distributed load on bolts Horizontal misalignment between segments

[0098] The earth pressure intensity at the top of the upper segment of the bolt at the third connection was calculated.

[0099] Earth pressure intensity at the bottom of the upper segment

[0100] Earth pressure intensity at the bottom of the lower segment

[0101] The force of the bolts on the upper segment

[0102] The force of the bolts on the upper segment

[0103] Uniformly distributed load on bolts

[0104] Horizontal misalignment between segments

[0105] Earth pressure strength at the top of the upper segment of the fourth connection bolt

[0106] Earth pressure intensity at the bottom of the upper segment

[0107] Earth pressure intensity at the bottom of the lower segment

[0108] The force of the bolts on the upper segment

[0109] The force of the bolts on the upper segment

[0110] Uniformly distributed load on bolts Horizontal misalignment between segments Earth pressure strength at the top of the upper segment of the fifth connection bolt

[0111] Earth pressure intensity at the bottom of the upper segment

[0112]

[0113] Earth pressure intensity at the bottom of the lower segment

[0114]

[0115] The force of the bolts on the upper segment

[0116] The force of the bolts on the upper segment

[0117] Uniformly distributed load on bolts Horizontal misalignment between segments Earth pressure strength at the top of the upper segment of the sixth connection bolt

[0118] Earth pressure intensity at the bottom of the upper segment

[0119]

[0120] Earth pressure intensity at the bottom of the lower segment

[0121]

[0122] The force of the bolts on the upper segment

[0123] The force of the bolts on the upper segment

[0124] Uniformly distributed load on bolts Horizontal misalignment between segments Earth pressure strength at the top of the upper segment of the seventh connection bolt

[0125] Earth pressure intensity at the bottom of the upper segment

[0126]

[0127] Earth pressure intensity at the bottom of the lower segment

[0128]

[0129] The force of the bolts on the upper segment

[0130] The force of the bolts on the upper segment

[0131] Uniformly distributed load on bolts

[0132] Horizontal misalignment between segments

[0133] Earth pressure strength at the top of the upper segment of the bolt at the eighth connection

[0134] Earth pressure intensity at the bottom of the upper segment

[0135] Earth pressure intensity at the bottom of the lower segment

[0136] The force of the bolts on the upper segment

[0137] The force of the bolts on the upper segment

[0138] Uniformly distributed load on bolts

[0139] Horizontal misalignment between segments

[0140] Earth pressure strength at the top of the upper segment of the ninth connection bolt

[0141] Earth pressure intensity at the bottom of the upper segment

[0142] Earth pressure intensity at the bottom of the lower segment

[0143] The force of the bolts on the upper segment

[0144] The force of the bolts on the upper segment

[0145] Uniformly distributed load on bolts

[0146] Horizontal misalignment between segments

[0147] Earth pressure strength at the top of the upper segment of the tenth connection bolt

[0148] Earth pressure intensity at the bottom of the upper segment

[0149] Earth pressure intensity at the bottom of the lower segment

[0150] The force of the bolts on the upper segment

[0151] The force of the bolts on the upper segment

[0152] Uniformly distributed load on bolts

[0153] Horizontal misalignment between segments Earth pressure strength at the top of the upper segment of the bolt at the eleventh connection.

[0154]

[0155] Earth pressure intensity at the bottom of the upper segment

[0156]

[0157] Earth pressure intensity at the bottom of the lower segment

[0158]

[0159] The force of the bolts on the upper segment

[0160] The force of the bolts on the upper segment

[0161] Uniformly distributed load on bolts Horizontal misalignment between segments Earth pressure strength at the top of the upper segment of the bolt at the twelfth connection.

[0162]

[0163] Earth pressure intensity at the bottom of the upper segment

[0164]

[0165] Earth pressure intensity at the bottom of the lower segment

[0166] The force of the bolts on the upper segment

[0167] The force of the bolts on the upper segment

[0168] Uniformly distributed load on bolts

[0169] Horizontal misalignment between segments

[0170] When the horizontal misalignment is ≥10mm, the waterproofing requirements are not met, and the caisson needs adjustment. Mud slurry can be added inside the caisson during the caisson process. The mud slurry can effectively balance the external soil pressure, reduce the force on the segments, and decrease the reaction force on the bolts, thus effectively reducing the misalignment of the segments. Alternatively, increasing the bolt cross-sectional area (e.g., using M70 bolts or bolts with a larger diameter) to connect the segments can also reduce the misalignment between them, according to the formula... Increasing the cross-section of the bolts increases the moment of inertia (I), naturally reducing the slippage. Finally, increasing the number of bolts in the cross-section can also reduce the slippage. In this example, each segment has 6 bolts, which can be increased to 8 bolts, bringing the total number of bolts in the entire ring to 48, effectively reducing the slippage.

[0171] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0172] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0173] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0174] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0175] It should be noted that any reference signs placed between parentheses in the claims should not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The invention can be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

[0176] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the invention.

[0177] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

[0178] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0179] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

Claims

1. A method for measuring the horizontal misalignment amount between segment rings in fabricated caisson construction, characterized by, include: Obtain the unit weight of each soil layer The thickness of each soil layer Soil layer on the outer side of the caisson wall i internal friction angle Cohesion of each soil layer ; Based on the soil layers on the outer sidewall of the caisson i internal friction angle Calculate the active earth pressure coefficient for each soil layer ; Based on the unit weight of each soil layer The thickness of each soil layer Cohesion of each soil layer Active earth pressure coefficient of each soil layer Calculate the earth pressure intensity at the top of the upper segment of the bolt. Earth pressure strength at the bottom of the upper segment of the bolt Earth pressure strength at the bottom of the lower segment of the bolt ; Based on the earth pressure intensity at the top of the upper segment of the bolt Earth pressure strength at the bottom of the upper segment of the bolt Earth pressure strength at the bottom of the lower segment of the bolt Single segment height Calculate the force exerted by the bolts on the upper segment. The force exerted by the bolts on the lower segment ; Based on the force exerted by the bolts on the upper segment The force exerted by the bolts on the lower segment Calculate the uniformly distributed load on the bolt ; Based on the uniformly distributed load on the bolt Calculate the horizontal displacement between tunnel segments. .

2. The method for determining the horizontal misalignment between segment rings during prefabricated caisson construction according to claim 1, characterized in that, The unit weight of each soil layer The thickness of each soil layer Soil layer on the outer side of the caisson wall i internal friction angle Cohesion of each soil layer Obtained through actual engineering survey reports.

3. The method for determining the horizontal misalignment between segment rings during prefabricated caisson construction according to claim 1, characterized in that, The active earth pressure coefficient of each soil layer .

4. The method for determining the horizontal misalignment between segment rings during prefabricated caisson construction according to claim 1, characterized in that, The above is based on the unit weight of each soil layer The thickness of each soil layer Cohesion of each soil layer Active earth pressure coefficient of each soil layer Calculate the earth pressure intensity at the top of the upper segment of the bolt. Earth pressure strength at the bottom of the upper segment of the bolt Earth pressure strength at the bottom of the lower segment of the bolt include: Obtain the perimeter of the caisson sidewall Total number of bolts between caisson rings ; Based on the unit weight of each soil layer above the top of the upper segment of the bolt The height of each soil layer above the top of the upper segment of the bolt. Active earth pressure coefficient of the soil layer at the top of the upper segment of the bolt. The cohesion of the soil layer at the top of the upper segment of the bolt. Calculate the earth pressure intensity at the top of the upper segment of the bolt. ; Based on the unit weight of each soil layer above the bottom of the upper segment of the bolt The height of each soil layer above the bottom of the upper segment of the bolt. Active earth pressure coefficient of the soil layer at the bottom of the upper segment of the bolt. The cohesion of the soil layer at the bottom of the upper segment of the bolt. Calculate the earth pressure intensity at the bottom of the upper segment above the bolt. ; Based on the unit weight of each soil layer above the bottom of the lower segment of the bolt The height of each soil layer above the bottom of the bolted segment Active earth pressure coefficient of the soil layer at the bottom of the bolted segment The cohesion of the soil layer at the bottom of the bolted segment Calculate the earth pressure intensity at the bottom of the lower segment of the bolt. .

5. The method for determining the horizontal misalignment between segment rings during prefabricated caisson construction according to claim 4, characterized in that, Earth pressure at the top of the upper segment of the bolt ; Earth pressure intensity at the bottom of the upper segment of the bolt ; Earth pressure at the bottom of the lower segment of the bolt .

6. The method for determining the horizontal misalignment between segment rings during prefabricated caisson construction according to claim 1, characterized in that, The soil pressure intensity at the top of the upper segment of the bolt is used as a basis. Earth pressure strength at the bottom of the upper segment of the bolt Earth pressure strength at the bottom of the lower segment of the bolt Single segment height Calculate the force exerted by the bolts on the upper segment. The force exerted by the bolts on the lower segment include: Based on the unit weight of the soil layer above the bottom of the upper segment of the bolt Active earth pressure coefficient of the soil layer at the bottom of the upper segment of the bolt. The cohesion of the soil layer at the bottom of the upper segment of the bolt. Calculate the critical depth The critical depth Wherein, the critical depth z0 is located on segment m. If z0 is located in the segment closest to the upper part of the bolt, the force exerted by the bolt on the upper segment is... ; If the critical depth The force exerted by the bolt on the upper segment is not located in the segment closest to the upper part of the bolt. ; The force exerted by the bolt on the lower segment .

7. The method for determining the horizontal misalignment between segment rings during prefabricated caisson construction according to claim 1, characterized in that, The force exerted by the bolts on the upper segment is described. The force exerted by the bolts on the lower segment Calculate the uniformly distributed load on the bolt include: Get bolt length ; The uniformly distributed load .

8. The method for determining the horizontal misalignment between segment rings during prefabricated caisson construction according to claim 1, characterized in that, The basis is the uniformly distributed load on the bolt Calculate the horizontal displacement between tunnel segments. include: Based on bolt cross-sectional diameter Calculate the moment of inertia of the bolt section The moment of inertia of the cross section ; Obtain the elastic modulus of the bolt ; The horizontal misalignment between the segments .

9. The method for determining the horizontal misalignment between segment rings during prefabricated caisson construction according to claim 8, characterized in that, The elastic modulus of the bolt Bolt cross-section diameter The parameters are obtained by using the bolt type in actual engineering projects.

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