CN113914907B - Method and device for waterproofing concrete at outer corners of shield tunnel segments - Google Patents

Method and device for waterproofing concrete at outer corners of shield tunnel segments Download PDF

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CN113914907B
CN113914907B CN202110993634.1A CN202110993634A CN113914907B CN 113914907 B CN113914907 B CN 113914907B CN 202110993634 A CN202110993634 A CN 202110993634A CN 113914907 B CN113914907 B CN 113914907B
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steel bar
value
stress
concrete
extrusion force
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CN113914907A (en
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肖明清
薛光桥
鲁志鹏
罗驰恒
张忆
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China Railway Siyuan Survey and Design Group Co Ltd
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China Railway Siyuan Survey and Design Group Co Ltd
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
    • E21D11/385—Sealing means positioned between adjacent lining members
    • E21D11/386—Sealing means positioned between adjacent lining members inflatable sealing means
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04—Lining with building materials
    • E21D11/08—Lining with building materials with preformed concrete slabs
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04—Lining with building materials
    • E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/13—Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2111/00—Details relating to CAD techniques
    • G06F2111/10—Numerical modelling
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy

Abstract

The invention discloses a method and a device for waterproofing concrete at the outer corners of segments of a shield tunnel, which belong to the technical field of shield tunnel construction and comprise the steps of extruding the joint of two segments through an elastic rubber sealing gasket and a sponge rubber strip to obtain extrusion force values; obtaining tensile stress values in the concrete at the outer corners of the two segments through numerical simulation calculation; obtaining a development width value of the crack according to the tensile stress value and a preset standard formula, and obtaining corresponding V-shaped steel bar parameters if the development width value of the crack is not greater than the value A; according to the parameters of the V-shaped steel bars, the stress and the area of the steel bars are obtained through a stress calculation formula of the longitudinal common steel bars in the tension zone of the reinforced concrete member; according to the stress and the area of the steel bars, the diameter value and the spacing value of the V-shaped steel bars arranged at the outer corners of the segments are converted. The invention can enhance the tensile strength of the concrete at the outer corner of the shield tunnel segment, and is beneficial to improving the waterproof performance.

Description

Method and device for waterproofing concrete at outer corners of shield tunnel segments
Technical Field
The invention belongs to the technical field of shield tunnel construction, and particularly relates to a method and a device for waterproofing concrete at the outer corners of shield tunnel segments.
Background
The shield method is a fully mechanized construction method in the construction of a hidden excavation method, and is a mechanized construction method which is characterized in that shield machinery is propelled in the ground, surrounding rocks around a shield shell and a duct piece support are used for preventing collapse in a tunnel, soil body excavation is carried out by a cutting device in front of an excavation face, the soil body is carried out of the tunnel by an earth-discharging machine, the soil body is pressurized and jacked in the rear part by a jack, and precast concrete duct pieces are assembled to form a tunnel structure.
At present, in the existing shield tunnel construction technology, a treatment method of arranging a reinforcing mesh in a concrete area outside a sealing gasket groove is generally adopted, but the maximum water pressure of an underwater shield tunnel breaks through 100m, so that the joint waterproof requirement on the shield tunnel is higher and higher, the contact pressure of a duct piece waterproof sealing gasket is also higher and higher, the reinforcing mesh is difficult to fix in the treatment method of arranging the reinforcing mesh in the concrete area outside the sealing gasket groove, deformation and deflection are easy to occur in the duct piece concrete pouring process, and the use effect is poor. And the plain concrete range of the area where the reinforcing mesh is located is small, even if powerful fixing measures are taken for the reinforcing mesh, the distance between the reinforcing mesh and the segment steel bars is small, so that adverse effects on the concrete pouring quality and compactness are caused, the waterproof performance is further influenced, the tensile strength of the concrete at the outer side corner of the segment of the shield tunnel is weaker, and the waterproof performance is reduced.
In summary, in the existing shield tunnel construction technology, there are technical problems that the tensile strength of the concrete at the outer corner of the shield tunnel segment is weak and the waterproof property is poor.
Disclosure of Invention
The invention aims to solve the technical problems that the tensile strength of concrete at the outer corner of a shield tunnel segment is weak and the waterproof performance is poor.
In order to solve the technical problems, the invention provides a method for waterproofing concrete at the outer corners of shield tunnel segments, which comprises the following steps: the extrusion force value is obtained by extruding the joint of the two duct pieces through the elastic rubber sealing gasket and the sponge rubber strip; according to the obtained extrusion force value, obtaining the tensile stress values in the concrete at the outer corners of the two segments through numerical simulation calculation; obtaining a development width value of the crack according to the obtained tensile stress value and a preset standard formula, and comparing and judging the development width value of the crack with a value A, wherein the value range of the value A is 0.05mm to 0.1mm; if the development width value of the crack is not greater than the value A, corresponding V-shaped steel bar parameters are obtained, wherein the V-shaped steel bar parameters comprise the steel bar diameter and the steel bar arrangement interval; according to the obtained V-shaped steel bar parameters, the steel bar stress and the steel bar area are obtained through a stress calculation formula of a longitudinal common steel bar in a tension zone of the reinforced concrete member; and converting the diameter value and the spacing value of the V-shaped steel bars arranged at the outer corners of the segments according to the obtained steel bar stress and the steel bar area.
Further, the method further comprises: and installing the V-shaped steel bars to an installation area on the outer side of the duct piece according to the calculated diameter values and the interval values of the V-shaped steel bars, wherein the installation area is close to a main steel bar on the outer side of the duct piece.
Further, the main ribs on the outer side of the duct piece are U-shaped ribs, and the main ribs on the inner side of the duct piece are straight ribs.
Further, the obtaining the tensile stress values in the concrete at the outer corners of the duct piece according to the obtained extrusion force values through numerical simulation calculation comprises: establishing a segment C60 type concrete structure model by adopting finite element calculation software; adopting a plane strain model for simulation, wherein the boundary condition is that an upper cambered surface of the plane strain model is a free surface, the left side and the lower side of the plane strain model are fixed ends, and extrusion force formed by an elastic sealing gasket and a sponge rubber strip acts on the right side of a segment structure in the plane strain model; after a plane strain model of a structure, constraint and load is established, stress calculation is carried out through software according to extrusion force values, a structural stress cloud picture is obtained, and the structural maximum tensile stress is extracted, wherein the structural maximum tensile stress is the tensile stress value in the concrete at the outer corner of the duct piece.
Further, the preset canonical formula includes:
Figure BDA0003233138280000031
wherein said->
Figure BDA0003233138280000032
For the crack development width value, the alpha cr The psi is a stress characteristic coefficient of the component, and is a strain non-uniformity coefficient of longitudinal tension steel bars among cracks; when the psi is less than 0.2, then the psi=0.2, and when the psi is more than 1.0, then the psi=1.0; for members directly subjected to repeated loads, then the ψ=1.0; the sigma s The method comprises the steps of calculating the longitudinal tensile normal steel bar stress of the reinforced concrete member according to load quasi-permanent combination or the longitudinal tensile steel bar equivalent stress of the prestressed concrete member according to standard combination; the Es is the elastic modulus of the steel bar, the Cs is the distance from the outer edge of the longitudinal tensile steel bar of the outermost layer to the bottom edge of the tensile zone, when the Cs is less than 20, the Cs=20, and when the Cs is more than 65, the Cs=65; the p is te The longitudinal tension steel bars are calculated according to the effective tension concrete cross-sectional area; said d eq Is the equivalent diameter of the longitudinal steel bar in the tension zone; for unbonded post-tensioning members, only the tension zone is longitudinally tensioned with the equivalent diameter of the common reinforcing steel bar.
According to still another aspect of the present invention, there is provided an apparatus for waterproofing concrete at an outside corner of a shield tunnel segment, the apparatus comprising: the extrusion force value acquisition module is used for extruding the joint of the two duct pieces through the elastic rubber sealing gasket and the sponge rubber strip to obtain an extrusion force value; the tensile stress value acquisition module is used for acquiring tensile stress values in the concrete at the outer corners of the two segments through numerical simulation calculation according to the acquired extrusion force values; the comparison and judgment module is used for obtaining the development width value of the crack according to the obtained tensile stress value and a preset standard formula, and comparing and judging the development width value of the crack with a value A, wherein the value range of the value A is 0.05mm to 0.1mm; the steel bar parameter acquisition module is used for acquiring corresponding V-shaped steel bar parameters if the development width value of the crack is not larger than the value A, wherein the V-shaped steel bar parameters comprise the steel bar diameter and the steel bar arrangement interval; the steel bar stress and area acquisition module is used for acquiring the steel bar stress and the steel bar area through a stress calculation formula of the longitudinal common steel bar in the tension zone of the reinforced concrete member according to the obtained V-shaped steel bar parameters; and the diameter and interval value acquisition module is used for converting the diameter value and interval value of the V-shaped reinforcing steel bars arranged at the outer corners of the duct piece according to the obtained reinforcing steel bar stress and the reinforcing steel bar area.
Further, the apparatus further comprises: and the installation module is used for installing the V-shaped steel bars to an installation area on the outer side of the duct piece according to the diameter value and the interval value of the converted V-shaped steel bars, and the installation area is close to a main bar on the outer side of the duct piece.
Further, the main ribs on the outer side of the duct piece are U-shaped ribs, and the main ribs on the inner side of the duct piece are straight ribs.
Further, the obtaining the tensile stress values in the concrete at the outer corners of the duct piece according to the obtained extrusion force values through numerical simulation calculation comprises: the obtaining the tensile stress values in the concrete at the outer corners of the duct piece through numerical simulation calculation according to the obtained extrusion force values comprises the following steps: establishing a segment C60 type concrete structure model by adopting finite element calculation software; adopting a plane strain model for simulation, wherein the boundary condition is that an upper cambered surface of the plane strain model is a free surface, the left side and the lower side of the plane strain model are fixed ends, and extrusion force formed by an elastic sealing gasket and a sponge rubber strip acts on the right side of a segment structure in the plane strain model; after a plane strain model of a structure, constraint and load is established, stress calculation is carried out through software according to extrusion force values, a structural stress cloud picture is obtained, and the structural maximum tensile stress is extracted, wherein the structural maximum tensile stress is the tensile stress value in the concrete at the outer corner of the duct piece.
Further, the preset canonical formula includes:
Figure BDA0003233138280000041
wherein said->
Figure BDA0003233138280000042
For the crack development width value, the alpha cr The psi is a stress characteristic coefficient of the component, and is a strain non-uniformity coefficient of longitudinal tension steel bars among cracks; when the psi is less than 0.2, then the psi=0.2, and when the psi is more than 1.0, then the psi=1.0; for members directly subjected to repeated loads, then the ψ=1.0; the sigma s The method comprises the steps of calculating the longitudinal tensile normal steel bar stress of the reinforced concrete member according to load quasi-permanent combination or the longitudinal tensile steel bar equivalent stress of the prestressed concrete member according to standard combination; the Es is the elastic modulus of the steel bar, the Cs is the distance from the outer edge of the longitudinal tensile steel bar of the outermost layer to the bottom edge of the tensile zone, when the Cs is less than 20, the Cs=20, and when the Cs is more than 65, the Cs=65; the p is te The longitudinal tension steel bars are calculated according to the effective tension concrete cross-sectional area; said d eq Is the equivalent diameter of the longitudinal steel bar in the tension zone; for unbonded post-tensioning members, only the tension zone is longitudinally tensioned with the equivalent diameter of the common reinforcing steel bar.
The beneficial effects are that:
the invention provides a method for waterproofing concrete at the outer corners of segments of a shield tunnel, which comprises the steps of extruding the joint of two segments through an elastic rubber sealing gasket and a sponge rubber strip to obtain extrusion force values; according to the obtained extrusion force value, obtaining the tensile stress values in the concrete at the outer corners of the two segments through numerical simulation calculation; obtaining a development width value of the crack according to the obtained tensile stress value and a preset standard formula, and comparing and judging the development width value of the crack with a value A, wherein the value range of the value A is 0.05mm to 0.1mm; if the development width value of the crack is not greater than the value A, corresponding V-shaped steel bar parameters are obtained, wherein the V-shaped steel bar parameters comprise the steel bar diameter and the steel bar arrangement interval; according to the obtained V-shaped steel bar parameters, the steel bar stress and the steel bar area are obtained through a stress calculation formula of a longitudinal common steel bar in a tension zone of the reinforced concrete member; and converting the diameter value and the spacing value of the V-shaped steel bars arranged at the outer corners of the segments according to the obtained steel bar stress and the steel bar area. Therefore, the space for installing the V-shaped steel bars is arranged in the corner area outside the duct piece, the installed V-shaped steel bars are arranged according to the diameter value and the interval value of the obtained V-shaped steel bars, the corner area outside the duct piece can be reinforced, the tensile strength of concrete in the corner area outside the duct piece is enhanced, and the waterproof performance of the corner area outside the duct piece is improved. Thereby achieving the technical effects of enhancing the tensile strength of the concrete at the outer corner of the shield tunnel segment and being beneficial to improving the waterproofness.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for waterproofing concrete at an outer corner of a shield tunnel segment according to an embodiment of the present invention;
fig. 2 is a structural diagram of a device for waterproofing concrete at an outer corner of a shield tunnel segment, which is provided by an embodiment of the invention;
FIG. 3 is a calculated stress cloud chart of segment joint values in a method for waterproofing concrete at the outer corners of segments of a shield tunnel according to an embodiment of the present invention;
fig. 4 is a schematic diagram one of a device for waterproofing concrete at an outer corner of a shield tunnel segment according to an embodiment of the present invention;
fig. 5 is a schematic diagram II of a device for waterproofing concrete at an outer corner of a shield tunnel segment according to an embodiment of the present invention.
Detailed Description
The invention discloses a method for waterproofing concrete at the outer corners of shield tunnel segments, which comprises the steps of extruding the joint of two segments through an elastic rubber sealing gasket and a sponge rubber strip to obtain extrusion force values; according to the obtained extrusion force value, obtaining the tensile stress values in the concrete at the outer corners of the two segments through numerical simulation calculation; obtaining a development width value of the crack according to the obtained tensile stress value and a preset standard formula, and comparing and judging the development width value of the crack with a value A, wherein the value range of the value A is 0.05mm to 0.1mm; if the development width value of the crack is not greater than the value A, obtaining corresponding V-shaped steel bar 7 parameters, wherein the V-shaped steel bar 7 parameters comprise steel bar diameters and steel bar arrangement intervals; according to the obtained parameters of the V-shaped steel bar 7, the steel bar stress and the steel bar area are obtained through a stress calculation formula of a longitudinal common steel bar in a tension zone of the reinforced concrete member; and converting the diameter value and the spacing value of the V-shaped steel bars arranged at the outer corners of the segments according to the obtained steel bar stress and the steel bar area. Therefore, the space for installing the V-shaped steel bars is arranged in the corner area (namely the installation area) on the outer side of the duct piece, the installed V-shaped steel bars are arranged according to the diameter value and the interval value of the obtained V-shaped steel bars, the corner area on the outer side of the duct piece can be reinforced, the tensile strength of concrete in the corner area on the outer side of the duct piece is enhanced, and the waterproof performance of the corner area on the outer side of the duct piece is improved. Thereby achieving the technical effects of enhancing the tensile strength of the concrete at the outer corner of the shield tunnel segment and being beneficial to improving the waterproofness.
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention are within the scope of the present invention; wherein reference to "and/or" in this embodiment indicates and/or two cases, in other words, reference to a and/or B in the embodiments of the present invention indicates two cases of a and B, A or B, and describes three states in which a and B exist, such as a and/or B, and indicates: only A and not B; only B and not A; includes A and B.
It will be understood that, although the terms "first," "second," etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments. Spatially relative terms, such as "below," "above," and the like, may be used herein to facilitate a description of one element or feature's relationship to another element or feature. It will be understood that the spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "below" would then be oriented "on" other elements or features. Thus, the exemplary term "below" may include both above and below orientations. The device may be oriented (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Also, in embodiments of the present invention, when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical", "horizontal", "left", "right" and the like are used in the embodiments of the present invention for illustrative purposes only and are not intended to limit the present invention.
Example 1
Referring to fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, fig. 1 is a flowchart of a method for waterproofing outside corner concrete of a shield tunnel segment according to an embodiment of the present invention, fig. 2 is a structural diagram of a device for waterproofing outside corner concrete of a shield tunnel segment according to an embodiment of the present invention, fig. 3 is a calculated stress cloud chart of segment joint values in a method for waterproofing outside corner concrete of a shield tunnel segment according to an embodiment of the present invention, fig. 4 is a schematic diagram one of a device for waterproofing outside corner concrete of a shield tunnel segment according to an embodiment of the present invention, and fig. 5 is a schematic diagram two of a device for waterproofing outside corner concrete of a shield tunnel segment according to an embodiment of the present invention. The embodiment of the invention provides a method for waterproofing concrete at the outer corner of a shield tunnel segment, which comprises the following steps:
step S100, extruding the joint of the two duct pieces through an elastic rubber sealing gasket and a sponge rubber strip to obtain an extrusion force value;
the main ribs 5 on the outer side of the duct piece are U-shaped ribs, and the main ribs 6 on the inner side of the duct piece are straight ribs.
Specifically, the main rib 5 on the outer side of one segment is set as a U-shaped rib, and the main rib 6 on the inner side of the segment is set as a straight rib, and the U-shaped rib and the straight rib are connected to each other. The elastic rubber gasket and the sponge rubber strip are installed in the duct piece joint groove 4 in the joint between the two duct pieces, and the extrusion force of the elastic rubber gasket and the sponge rubber strip (the sponge rubber strip can be positioned at the outer side of the elastic gasket) in the two duct pieces is acted on the joint between the two duct pieces (the joint can be extrusion of the face of the duct piece where the elastic gasket and the sponge rubber strip are installed). The arrangement mode of the main ribs of the duct piece is set to be U-shaped outside main ribs and straight inside main ribs, so that the range of a corner plain concrete area can be enlarged, and the arrangement condition of the detail construction steel bars is reserved. Meanwhile, the extrusion force value is provided for the step S110, namely the extrusion force of the joint outer sealing gasket and the sponge rubber strip on the pipe piece acts on the pipe piece, and the tensile stress in the corner concrete can be obtained by adopting a numerical analysis method.
Step S110, according to the obtained extrusion force value, obtaining the tensile stress values in the concrete at the outer corners of the duct piece through numerical simulation calculation;
the obtaining the tensile stress values in the concrete at the outer corners of the duct piece through numerical simulation calculation according to the obtained extrusion force values comprises the following steps: establishing a segment C60 type concrete structure model by adopting finite element calculation software; adopting a plane strain model for simulation, wherein the boundary condition is that an upper cambered surface of the plane strain model is a free surface, the left side and the lower side of the plane strain model are fixed ends, and extrusion force formed by an elastic sealing gasket and a sponge rubber strip acts on the right side of a segment structure in the plane strain model; after a plane strain model of a structure, constraint and load is established, stress calculation is carried out through software according to extrusion force values, a structural stress cloud picture is obtained, and the structural maximum tensile stress is extracted, wherein the structural maximum tensile stress is the tensile stress value in the concrete at the outer corner of the duct piece.
Specifically, after the extrusion force value is obtained in the step S100, a segment C60 concrete structure model may be established by using finite element calculation software, and a plane strain model is used for simulation, where the boundary condition is that the upper cambered surface is a free surface, the left side and the lower side of the model are fixed ends, and the extrusion force formed by the elastic sealing gasket and the sponge rubber strip acts on the right side of the segment structure. After the plane strain model of the structure-constraint-load is established, stress calculation is carried out through software, a structural stress cloud chart (shown in figure 3) is obtained, and the maximum structural tensile stress is extracted. The tensile stress value in the concrete at the outer corner of the segment is then provided for step S120 described below.
Step S120, obtaining a development width value of the crack according to the obtained tensile stress value and a preset standard formula, and comparing and judging the development width value of the crack with a value A, wherein the value range of the value A is 0.05mm to 0.1mm (the value is taken as a large value when the water pressure is small and as a small value when the water pressure is large);
the preset standard formula comprises:
Figure BDA0003233138280000091
wherein said->
Figure BDA0003233138280000092
For the crack development width value, the alpha cr The psi is a stress characteristic coefficient of the component, and is a strain non-uniformity coefficient of longitudinal tension steel bars among cracks; when the psi is less than 0.2, then the psi=0.2, and when the psi is more than 1.0, then the psi=1.0; for members directly subjected to repeated loads, then the ψ=1.0; the sigma s The method comprises the steps of calculating the longitudinal tensile normal steel bar stress of the reinforced concrete member according to load quasi-permanent combination or the longitudinal tensile steel bar equivalent stress of the prestressed concrete member according to standard combination; the Es is the elastic modulus of the steel bar, the Cs is the distance from the outer edge of the longitudinal tensile steel bar of the outermost layer to the bottom edge of the tensile zone, when the Cs is less than 20, the Cs=20, and when the Cs is more than 65, the Cs=65; the p is te The longitudinal tension steel bars are calculated according to the effective tension concrete cross-sectional area; said d eq Is the equivalent diameter of the longitudinal steel bar in the tension zone; for unbonded post-tensioning members, only the tension zone is longitudinally tensioned with the equivalent diameter of the common reinforcing steel bar.
Specifically, after the tensile stress value in the concrete at the outer corner of the segment is obtained in the step S100 and the step S110, the value a is not greater than the value a, which is greater than or equal to 0.05mm and is less than or equal to 0.1mm, by a preset design specification (i.e., the formula 7.1.2-1 in the "concrete structure design specification" 7.1.2), and according to the width of the crack (i.e., the width of the crack developed by the tensile stress action of the concrete at the corner of the segment). To divide the development width of the crack into a number (i.e
Figure BDA0003233138280000101
) And comparing with the value A, and judging, according to the comparison result, if the crack development width value is not larger than the value A, providing the V-shaped steel bar 7 parameters in the following step S130.
Step S130, if the development width value of the crack is not greater than the value A, obtaining corresponding V-shaped steel bar parameters, wherein the V-shaped steel bar parameters comprise the steel bar diameter and the steel bar arrangement interval;
specifically, according toThe step S100, the step S110 and the step S120 are described above to obtain the development width value of the crack (i.e.
Figure BDA0003233138280000102
) And in the process of comparing and judging with the value A, if the development width value of the crack is not larger than the value A, taking the diameter of the steel bar and the arrangement interval of the steel bar at the moment as the corresponding V-shaped steel bar 7 parameters. The required parameters of the V-bar 7 are then provided in step S140 described below.
Step S140, according to the obtained V-shaped steel bar parameters, the steel bar stress and the steel bar area are obtained through a stress calculation formula of a longitudinal common steel bar in a tension zone of the reinforced concrete member;
specifically, according to the parameters of the V-shaped steel bar 7 obtained in the steps S100, S110, S120 and S130 and the stress calculation formula of the longitudinal common steel bar in the tensile zone of the reinforced concrete member in the "concrete structure design Specification" 7.1.4, the steel bar stress can be calculated, and then the steel bar area As is obtained.
And S150, converting the diameter value and the spacing value of the V-shaped steel bars arranged at the outer corners of the segments according to the obtained steel bar stress and the steel bar area.
Specifically, after the steel bar stress and the steel bar area are obtained according to the steps S100, S110, S120, S130 and S140, according to the disclosure in the prior art, a person skilled in the art can directly calculate the diameter value and the distance value of the V-shaped steel bar disposed at the outer corner of the segment according to the obtained steel bar stress and the obtained steel bar area.
The method for waterproofing the concrete at the outer corner of the shield tunnel segment provided by the embodiment of the invention further comprises the following steps: and installing the V-shaped steel bars to an installation area on the outer side of the pipe piece according to the calculated diameter values and the interval values of the V-shaped steel bars, wherein the installation area is close to the main steel bars 5 on the outer side of the pipe piece.
Specifically, after the diameter value and the spacing value of the V-shaped reinforcing bars converted according to the above steps S100, S110, S120, S130, S140 and S150 are set to the installation area of the outside of the segment according to the diameter value and the spacing value of the V-shaped reinforcing bars, the installation area is close to the main bar 5 of the outside of the segment, that is, after the arrangement mode of the main bar of the segment is set to "the outside main bar is a U-shaped bar and the inside main bar is a straight bar", the V-shaped reinforcing bars are arranged at the outer arc corner gaps (i.e., the installation area) given by the main bar 5 of the outside of the segment set to the U-shaped bar according to the diameter value and the spacing value of the V-shaped reinforcing bars, so that the concrete of the outer arc corner of the segment at the waterproof gasket is protected, and the waterproof ability of the segment can be improved. The remaining construction bars may then be configured for ease of mounting the stressed bars. And the V-shaped steel bars arranged at the outer corners (namely the installation areas) of the shield tunnel segments are simpler, so that the installation is more convenient compared with the arrangement of the steel bar meshes, and the convenience and the construction reliability of construction are improved. The range of the plain concrete area of the corner is enlarged, conditions are reserved for the arrangement of the detail construction steel bars, the tensile strength of the concrete at the corner outside the duct piece can be enhanced in a reinforcement mode on the premise that the casting quality of the concrete at the corner is not affected, the construction is facilitated, and the practical operation is facilitated. And then the tensile strength of the concrete at the outer corner of the shield tunnel segment can be enhanced, which is beneficial to improving the waterproofness.
The invention provides a method for waterproofing concrete at the outer corners of segments of a shield tunnel, which comprises the steps of extruding the joint of two segments through an elastic rubber sealing gasket and a sponge rubber strip to obtain extrusion force values; according to the obtained extrusion force value, obtaining the tensile stress values in the concrete at the outer corners of the two segments through numerical simulation calculation; obtaining a development width value of the crack according to the obtained tensile stress value and a preset standard formula, and comparing and judging the development width value of the crack with a value A, wherein the value range of the value A is 0.05mm to 0.1mm; if the development width value of the crack is not greater than the value A, obtaining corresponding V-shaped steel bar 7 parameters, wherein the V-shaped steel bar 7 parameters comprise steel bar diameters and steel bar arrangement intervals; according to the obtained parameters of the V-shaped steel bar 7, the steel bar stress and the steel bar area are obtained through a stress calculation formula of a longitudinal common steel bar in a tension zone of the reinforced concrete member; and converting the diameter value and the spacing value of the V-shaped steel bars arranged at the outer corners of the segments according to the obtained steel bar stress and the steel bar area. The space for installing the V-shaped steel bars is arranged in the corner area (namely the installation area) on the outer side of the pipe piece, the installed V-shaped steel bars are arranged according to the diameter value and the interval value of the obtained V-shaped steel bars, the corner area on the outer side of the pipe piece can be reinforced, the tensile strength of concrete in the corner area on the outer side of the pipe piece is enhanced, and the waterproof performance of the corner area on the outer side of the pipe piece is improved. Thereby achieving the technical effects of enhancing the tensile strength of the concrete at the outer corner of the shield tunnel segment and being beneficial to improving the waterproofness.
In order to describe the device for waterproofing the concrete at the outer corner of the shield tunnel segment in detail, the embodiment of the invention describes the method for waterproofing the concrete at the outer corner of the shield tunnel segment in detail, and based on the same inventive concept, the application also provides a device for waterproofing the concrete at the outer corner of the shield tunnel segment, and the detail is shown in the second embodiment.
Example two
The second embodiment of the invention provides a device for waterproofing concrete at the outer corner of a shield tunnel segment, which comprises a extrusion force value acquisition module 200, a tensile stress value acquisition module 210, a comparison and judgment module 220, a steel bar parameter acquisition module 230, a steel bar stress and area acquisition module 240 and a diameter and interval value acquisition module 250, wherein the extrusion force value acquisition module 200 is used for extruding the joint of two segments through an elastic rubber sealing gasket and a sponge rubber strip to obtain an extrusion force value; the main ribs 5 on the outer side of the duct piece are U-shaped ribs, and the main ribs 6 on the inner side of the duct piece are straight ribs.
The tensile stress value obtaining module 210 is configured to obtain tensile stress values in the concrete at the outer corners of the two segments through numerical simulation calculation according to the obtained extrusion force values; wherein, according to the obtained extrusion force value, obtaining the tensile stress values in the concrete at the outer corners of the duct piece through numerical simulation calculation comprises the following steps: establishing a segment C60 type concrete structure model by adopting finite element calculation software; adopting a plane strain model for simulation, wherein the boundary condition is that an upper cambered surface of the plane strain model is a free surface, the left side and the lower side of the plane strain model are fixed ends, and extrusion force formed by an elastic sealing gasket and a sponge rubber strip acts on the right side of a segment structure in the plane strain model; after a plane strain model of a structure, constraint and load is established, stress calculation is carried out through software according to extrusion force values, a structural stress cloud picture is obtained, and the structural maximum tensile stress is extracted, wherein the structural maximum tensile stress is the tensile stress value in the concrete at the outer corner of the duct piece.
Meanwhile, the comparison and judgment module 220 is configured to obtain a value of a development width of the crack according to the obtained tensile stress value and a preset standard formula, and compare and judge the value of the development width of the crack with a value a, where the value range of the value a is 0.05mm to 0.1mm; wherein, the preset standard formula comprises:
Figure BDA0003233138280000131
wherein said->
Figure BDA0003233138280000132
For the crack development width value, the alpha cr The psi is a stress characteristic coefficient of the component, and is a strain non-uniformity coefficient of longitudinal tension steel bars among cracks; when the psi is less than 0.2, then the psi=0.2, and when the psi is more than 1.0, then the psi=1.0; for members directly subjected to repeated loads, then the ψ=1.0; the sigma s The method comprises the steps of calculating the longitudinal tensile normal steel bar stress of the reinforced concrete member according to load quasi-permanent combination or the longitudinal tensile steel bar equivalent stress of the prestressed concrete member according to standard combination; the Es is the elastic modulus of the steel bar, the Cs is the distance from the outer edge of the longitudinal tensile steel bar of the outermost layer to the bottom edge of the tensile zone, when the Cs is less than 20, the Cs=20, and when the Cs is more than 65, the Cs=65; the p is te The longitudinal tension steel bars are calculated according to the effective tension concrete cross-sectional area; said d eq Is a longitudinal steel in a tension zoneEquivalent diameter of the ribs; for unbonded post-tensioning members, only the tension zone is longitudinally tensioned with the equivalent diameter of the common reinforcing steel bar.
And, the reinforcement parameter obtaining module 230 is configured to obtain corresponding V-shaped reinforcement 7 parameters if the value of the development width of the crack is not greater than the value a, where the V-shaped reinforcement 7 parameters include a reinforcement diameter and a reinforcement arrangement pitch; the steel bar stress and area obtaining module 240 is configured to obtain a steel bar stress and a steel bar area according to the obtained V-shaped steel bar 7 parameter and by using a stress calculation formula of a normal steel bar in a tension zone of the reinforced concrete member; the diameter and distance value obtaining module 250 is configured to convert a diameter value and a distance value of the V-shaped steel bar disposed at the outer corner of the segment according to the obtained steel bar stress and the steel bar area. The device for waterproofing concrete at the outer corner of the shield tunnel segment provided by the second embodiment of the invention further comprises an arrangement and installation module 260, wherein the arrangement and installation module 260 is used for installing the V-shaped steel bars to an installation area at the outer side of the segment according to the diameter value and the interval value of the converted V-shaped steel bars, and the installation area is close to the main bar 5 at the outer side of the segment.
The invention provides a device for waterproofing concrete at the outer corners of segments of a shield tunnel, which is used for obtaining extrusion force values by extruding the joint of two segments through an elastic rubber sealing gasket and a sponge rubber strip through an extrusion force value obtaining module 200; the tensile stress value obtaining module 210 is configured to obtain tensile stress values in the concrete at the outer corners of the two segments through numerical simulation calculation according to the obtained extrusion force values; the comparison and judgment module 220 is configured to obtain a value of a development width of the crack according to the obtained tensile stress value and a preset standard formula, and compare and judge the value of the development width of the crack with a value a, where the value range of the value a is 0.05mm to 0.1mm; the steel bar parameter obtaining module 230 is configured to obtain corresponding V-shaped steel bar 7 parameters if the value of the development width of the crack is not greater than the value a, where the V-shaped steel bar 7 parameters include a steel bar diameter and a steel bar arrangement interval; the steel bar stress and area obtaining module 240 is configured to obtain a steel bar stress and a steel bar area according to the obtained V-shaped steel bar 7 parameter and by using a stress calculation formula of a normal steel bar in a tension zone of the reinforced concrete member; the diameter and distance value obtaining module 250 is configured to convert a diameter value and a distance value of the V-shaped steel bar disposed at the outer corner of the segment according to the obtained steel bar stress and the steel bar area. The space for installing the V-shaped steel bars is arranged in the corner area (namely the installation area) on the outer side of the pipe piece, the installed V-shaped steel bars are arranged according to the diameter value and the interval value of the obtained V-shaped steel bars, the corner area on the outer side of the pipe piece can be reinforced, the tensile strength of concrete in the corner area on the outer side of the pipe piece is enhanced, and the waterproof performance of the corner area on the outer side of the pipe piece is improved. Thereby achieving the technical effects of enhancing the tensile strength of the concrete at the outer corner of the shield tunnel segment and being beneficial to improving the waterproofness.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present invention.

Claims (6)

1. A method for waterproofing concrete at an outer corner of a shield tunnel segment, the method comprising:
the extrusion force value is obtained by extruding the joint of the two duct pieces through the elastic rubber sealing gasket and the sponge rubber strip;
according to the obtained extrusion force value, obtaining the tensile stress values in the concrete at the outer corners of the two segments through numerical simulation calculation;
obtaining a development width value of the crack according to the obtained tensile stress value and a preset standard formula, and comparing and judging the development width value of the crack with a value A, wherein the value range of the value A is 0.05mm to 0.1mm;
if the development width value of the crack is not greater than the value A, corresponding V-shaped steel bar parameters are obtained, wherein the V-shaped steel bar parameters comprise the steel bar diameter and the steel bar arrangement interval;
according to the obtained V-shaped steel bar parameters, the steel bar stress and the steel bar area are obtained through a stress calculation formula of a longitudinal common steel bar in a tension zone of the reinforced concrete member;
according to the obtained steel bar stress and the steel bar area, converting the diameter value and the interval value of the V-shaped steel bars arranged at the outer corners of the segments;
the obtaining the tensile stress values in the concrete at the outer corners of the duct piece through numerical simulation calculation according to the obtained extrusion force values comprises the following steps:
establishing a segment C60 type concrete structure model by adopting finite element calculation software;
adopting a plane strain model for simulation, wherein the boundary condition is that an upper cambered surface of the plane strain model is a free surface, the left side and the lower side of the plane strain model are fixed ends, and extrusion force formed by an elastic sealing gasket and a sponge rubber strip acts on the right side of a segment structure in the plane strain model;
after a plane strain model of a structure, constraint and load is established, carrying out stress calculation through software according to extrusion force values to obtain a structural stress cloud picture so as to extract the structural maximum tensile stress, wherein the structural maximum tensile stress is a tensile stress value in the concrete at the corner of the outer side of the duct piece;
the preset standard formula is as follows:
Figure FDA0004214170880000021
wherein said omega max For the crack development width value, the alpha cr The psi is a stress characteristic coefficient of the component, and is a strain non-uniformity coefficient of longitudinal tension steel bars among cracks; the sigma s The method comprises the steps of calculating the longitudinal tensile normal steel bar stress of the reinforced concrete member according to load quasi-permanent combination or the longitudinal tensile steel bar equivalent stress of the prestressed concrete member according to standard combination; the E is s Is the elastic modulus of the steel bar, the C s Is the outermost layer is longitudinalThe distance from the outer edge of the tension steel bar to the bottom edge of the tension zone; said ρ te The longitudinal tension steel bars are calculated according to the effective tension concrete cross-sectional area; said d eq Is the equivalent diameter of the longitudinal steel bar in the tension zone; for unbonded post-tensioning members, only the tension zone is longitudinally tensioned with the equivalent diameter of the common reinforcing steel bar.
2. The method for waterproofing shield tunnel segment outside corner concrete according to claim 1, wherein the method further comprises:
and installing the V-shaped steel bars to an installation area on the outer side of the duct piece according to the calculated diameter values and the interval values of the V-shaped steel bars, wherein the installation area is close to a main steel bar on the outer side of the duct piece.
3. The method for waterproofing concrete at the outer corners of shield tunnel segments according to claim 1, wherein:
the main rib on the outer side of the duct piece is set to be a U-shaped rib, and the main rib on the inner side of the duct piece is set to be a straight rib.
4. A device for waterproofing concrete at an outer corner of a shield tunnel segment, the device comprising:
the extrusion force value acquisition module is used for extruding the joint of the two duct pieces through the elastic rubber sealing gasket and the sponge rubber strip to obtain an extrusion force value;
the tensile stress value acquisition module is used for acquiring tensile stress values in the concrete at the outer corners of the two segments through numerical simulation calculation according to the acquired extrusion force values;
the comparison and judgment module is used for obtaining the development width value of the crack according to the obtained tensile stress value and a preset standard formula, and comparing and judging the development width value of the crack with a value A, wherein the value range of the value A is 0.05mm to 0.1mm;
the steel bar parameter acquisition module is used for acquiring corresponding V-shaped steel bar parameters if the development width value of the crack is not larger than the value A, wherein the V-shaped steel bar parameters comprise the steel bar diameter and the steel bar arrangement interval;
the steel bar stress and area acquisition module is used for acquiring the steel bar stress and the steel bar area through a stress calculation formula of the longitudinal common steel bar in the tension zone of the reinforced concrete member according to the obtained V-shaped steel bar parameters;
the diameter and interval value acquisition module is used for converting the diameter value and interval value of the V-shaped steel bars arranged at the outer corners of the duct piece according to the obtained steel bar stress and the steel bar area;
the obtaining the tensile stress values in the concrete at the outer corners of the duct piece through numerical simulation calculation according to the obtained extrusion force values comprises the following steps:
establishing a segment C60 type concrete structure model by adopting finite element calculation software;
adopting a plane strain model for simulation, wherein the boundary condition is that an upper cambered surface of the plane strain model is a free surface, the left side and the lower side of the plane strain model are fixed ends, and extrusion force formed by an elastic sealing gasket and a sponge rubber strip acts on the right side of a segment structure in the plane strain model;
after a plane strain model of a structure, constraint and load is established, carrying out stress calculation through software according to extrusion force values to obtain a structural stress cloud picture so as to extract the structural maximum tensile stress, wherein the structural maximum tensile stress is a tensile stress value in the concrete at the corner of the outer side of the duct piece;
the preset standard formula is as follows:
Figure FDA0004214170880000031
wherein said omega max For the crack development width value, the alpha cr The psi is a stress characteristic coefficient of the component, and is a strain non-uniformity coefficient of longitudinal tension steel bars among cracks; the sigma s The method comprises the steps of calculating the longitudinal tensile normal steel bar stress of the reinforced concrete member according to load quasi-permanent combination or the longitudinal tensile steel bar equivalent stress of the prestressed concrete member according to standard combination;the E is s Is the elastic modulus of the steel bar, the C s The distance from the outer edge of the longitudinal tension steel bar at the outermost layer to the bottom edge of the tension zone; said ρ te The longitudinal tension steel bars are calculated according to the effective tension concrete cross-sectional area; said d eq Is the equivalent diameter of the longitudinal steel bar in the tension zone; for unbonded post-tensioning members, only the tension zone is longitudinally tensioned with the equivalent diameter of the common reinforcing steel bar.
5. The apparatus for waterproofing concrete at an outside corner of a shield tunnel segment according to claim 4, wherein said apparatus further comprises:
and the installation module is used for installing the V-shaped steel bars to an installation area on the outer side of the duct piece according to the diameter value and the interval value of the converted V-shaped steel bars, and the installation area is close to a main bar on the outer side of the duct piece.
6. The device for waterproofing outside corner concrete of shield tunnel segment according to claim 4, wherein:
the main rib on the outer side of the duct piece is set to be a U-shaped rib, and the main rib on the inner side of the duct piece is set to be a straight rib.
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