CN113914907A - Method and device for preventing concrete at corner part outside shield tunnel segment from water - Google Patents

Method and device for preventing concrete at corner part outside shield tunnel segment from water Download PDF

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Publication number
CN113914907A
CN113914907A CN202110993634.1A CN202110993634A CN113914907A CN 113914907 A CN113914907 A CN 113914907A CN 202110993634 A CN202110993634 A CN 202110993634A CN 113914907 A CN113914907 A CN 113914907A
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steel bar
concrete
value
stress
area
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CN113914907B (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 preventing concrete at the corner part of the outer side of a shield tunnel segment from water, belonging to the technical field of shield tunnel construction, and comprising the steps of extruding the joint of two segments by an elastic rubber sealing gasket and a sponge rubber strip to obtain an extrusion force value; obtaining tensile stress values in concrete at the corners of the outer sides of the two pipe pieces through numerical simulation calculation; obtaining the numerical value of the developing width of the crack according to the tensile stress value and a preset standard formula, and if the numerical value of the developing width of the crack is not more than the numerical value A, obtaining the corresponding V-shaped steel bar parameter; according to the parameters of the V-shaped steel bars, the stress of the steel bars and the area of the steel bars are obtained through a stress calculation formula of the longitudinal common steel bars in the tension area of the reinforced concrete member; and (4) converting the diameter numerical value and the space numerical value of the V-shaped steel bar arranged at the corner part outside the duct piece according to the steel bar stress and the steel bar area. The invention can enhance the tensile strength of the concrete at the corner part outside the shield tunnel segment and is beneficial to improving the technical effect of waterproofness.

Description

Method and device for preventing concrete at corner part outside shield tunnel segment from water
Technical Field
The invention belongs to the technical field of shield tunnel construction, and particularly relates to a method and a device for preventing concrete at the corner part of the outer side of a shield tunnel segment from water.
Background
The shield method is a fully mechanical construction method in the construction of the undercut method, and is a mechanical construction method for pushing a shield machine in the ground, preventing collapse into a tunnel by supporting surrounding rocks around a shield shell and segments, excavating a soil body in front of an excavation surface by using a cutting device, transporting out of the tunnel by an unearthing machine, jacking at the rear part by a jack under pressure, and assembling precast concrete segments to form a tunnel structure.
At present, in the existing shield tunnel construction technology, a processing method of configuring a reinforcing mesh in a concrete area outside a sealing gasket groove is usually adopted, but the maximum water pressure of an underwater shield tunnel breaks through 100m, so that the waterproof requirement of a joint of the shield tunnel is higher and higher, the contact pressure of a segment waterproof sealing gasket is also higher and higher, the reinforcing mesh is difficult to fix in the processing method of configuring the reinforcing mesh in the concrete area outside the sealing gasket groove, the reinforcing mesh is easy to deform and shift in the segment concrete pouring process, and the use effect is poor. And the regional plain concrete scope of reinforcing bar net is little, even take powerful fixed measure to the reinforcing bar net, also can lead to producing adverse effect to concrete placement quality and closely knit degree because the interval of reinforcing bar net and section of jurisdiction reinforcing bar is little, and then influences waterproof performance, then the tensile strength of shield tunnel section of jurisdiction outside bight concrete is more weak, has reduced waterproof performance.
In conclusion, in the existing shield tunnel construction technology, the technical problems that the tensile strength of concrete at the corner part of the outer side of the shield tunnel segment is weak and the waterproofness is poor exist.
Disclosure of Invention
The technical problems to be solved by the invention are that the concrete at the corner part of the outer side of the shield tunnel segment has weak tensile strength and poor waterproofness.
In order to solve the technical problem, the invention provides a method for preventing concrete at the corner part outside the shield tunnel segment from water, which comprises the following steps: extruding the joint of the two pipe pieces through the elastic rubber sealing gasket and the sponge rubber strip to obtain an extrusion force value; according to the obtained extrusion force values, obtaining tensile stress values in the concrete at the corner parts of the outer sides of the two pipe pieces through numerical simulation calculation; obtaining a numerical value of the crack developing width according to the obtained tensile stress value and a preset standard formula, and comparing and judging the numerical value of the crack developing width with a numerical value A, wherein the numerical value A ranges from 0.05mm to 0.1 mm; if the numerical value of the developing width of the crack is not greater than the numerical value A, obtaining corresponding V-shaped steel bar parameters, wherein the V-shaped steel bar parameters comprise the diameter of the steel bar and the arrangement distance of the steel bar; according to the obtained V-shaped steel bar parameters, obtaining steel bar stress and steel bar area through a stress calculation formula of a longitudinal common steel bar in a tension area of the reinforced concrete member; and converting the diameter value and the space value of the V-shaped steel bar arranged at the corner part outside the pipe piece according to the obtained steel bar stress and the obtained 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 converted diameter numerical value and the converted interval numerical value of the V-shaped steel bars, wherein the installation area is close to the main bars on the outer side of the duct piece.
Further, the main rib in the section of jurisdiction outside sets up to U type muscle, the inboard main rib of section of jurisdiction sets up to straight type muscle.
Further, the obtaining of the tensile stress values in the concrete at the corner parts outside the duct piece through numerical simulation calculation according to the obtained extrusion force values 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 the 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 pipe sheet structure in the plane strain model; after a plane strain model of the structure, the constraint and the load is built, stress calculation is carried out through software according to extrusion force numerical values to obtain a structural stress cloud chart, and the structural maximum tensile stress is extracted, and is the tensile stress value in the corner concrete on the outer side of the duct piece.
Further, the preset specification formula includes:
Figure BDA0003233138280000031
wherein said
Figure BDA0003233138280000032
For the value of the propagation width of the fracture, said αcrThe coefficient is a stress characteristic coefficient of the component, and psi is a coefficient of uneven strain of longitudinal tension steel bars among cracks; when the psi is less than 0.2, the psi is 0.2, and when the psi is more than 1.0, the psi is 1.0; for a component directly bearing repeated loads, the psi is 1.0; the sigmasThe normal longitudinal tension steel bar stress of the reinforced concrete member calculated according to the load quasi-permanent combination or the equivalent longitudinal tension steel bar stress of the prestressed concrete member calculated according to the standard combination; the Es is the elastic modulus of the steel bar, the Cs is the distance from the outer edge of the outermost longitudinal tension steel bar to the bottom edge of the tension area, when the Cs is less than 20, the Cs is 20, and when the Cs is more than 65, the Cs is 65; said p isteThe longitudinal tension steel bar is calculated according to the effective section area of the tension concrete; d iseqThe equivalent diameter of the longitudinal steel bar in the tension area; for the unbonded post-tensioning member, the equivalent diameter of the common steel bar longitudinally tensioned in the tension area is only.
According to still another aspect of the present invention, there is also provided an apparatus for waterproofing concrete at an outside corner of a shield tunnel segment, the apparatus comprising: the extrusion force numerical value acquisition module is used for extruding the joint of the two pipe pieces through the elastic rubber sealing gasket and the sponge rubber strip to acquire an extrusion force numerical value; the tensile stress value acquisition module is used for acquiring tensile stress values in the concrete at the corner parts of the outer sides of the two duct pieces through numerical simulation calculation according to the acquired extrusion force values; the comparison and judgment module is used for obtaining the developing width value of the crack according to the obtained tensile stress value and a preset standard formula, and comparing and judging the developing width value of the crack with a value A, wherein the value range of the value A is 0.05mm to 0.1 mm; the steel bar parameter acquisition module is used for acquiring corresponding V-shaped steel bar parameters if the developing width value of the crack is not greater than the value A, wherein the V-shaped steel bar parameters comprise the diameter of the steel bar and the arrangement distance of the steel bar; the steel bar stress and area acquisition module is used for acquiring steel bar stress and steel bar area according to the acquired V-shaped steel bar parameters through a stress calculation formula of a longitudinal common steel bar in a tension area of the reinforced concrete member; and the diameter and interval value acquisition module is used for converting the diameter value and the interval value of the V-shaped steel bar arranged at the corner part outside the duct piece according to the obtained steel bar stress and the steel bar area.
Further, the apparatus further comprises: and the arrangement and installation module is used for installing the V-shaped steel bars to the installation area on the outer side of the duct piece according to the converted diameter numerical value and the converted interval numerical value of the V-shaped steel bars, and the installation area is close to the main bars on the outer side of the duct piece.
Further, the main rib in the section of jurisdiction outside sets up to U type muscle, the inboard main rib of section of jurisdiction sets up to straight type muscle.
Further, the obtaining of the tensile stress values in the concrete at the corner parts outside the duct piece through numerical simulation calculation according to the obtained extrusion force values comprises: the step of obtaining tensile stress values in the concrete at the corner parts outside the two pipe pieces 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 the 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 pipe sheet structure in the plane strain model; after a plane strain model of the structure, the constraint and the load is built, stress calculation is carried out through software according to extrusion force numerical values to obtain a structural stress cloud chart, and the structural maximum tensile stress is extracted, and is the tensile stress value in the corner concrete on the outer side of the duct piece.
Further, the preset specification formula includes:
Figure BDA0003233138280000041
wherein said
Figure BDA0003233138280000042
For the value of the propagation width of the fracture, said αcrThe coefficient is a stress characteristic coefficient of the component, and psi is a coefficient of uneven strain of longitudinal tension steel bars among cracks; when the psi is less than 0.2, the psi is 0.2, and when the psi is more than 1.0, the psi is 1.0; for a component directly bearing repeated loads, the psi is 1.0; the sigmasThe normal longitudinal tension steel bar stress of the reinforced concrete member calculated according to the load quasi-permanent combination or the equivalent longitudinal tension steel bar stress of the prestressed concrete member calculated according to the standard combination; the Es is the elastic modulus of the steel bar, the Cs is the distance from the outer edge of the outermost longitudinal tension steel bar to the bottom edge of the tension area, when the Cs is less than 20, the Cs is 20, and when the Cs is more than 65, the Cs is 65; said p isteThe longitudinal tension steel bar is calculated according to the effective section area of the tension concrete; d iseqThe equivalent diameter of the longitudinal steel bar in the tension area; for the unbonded post-tensioning member, the equivalent diameter of the common steel bar longitudinally tensioned in the tension area is only.
Has the advantages that:
the invention provides a method for preventing concrete at the corner part of the outer side of a shield tunnel segment from water, which comprises the following steps of extruding the joint of two segments by an elastic rubber sealing gasket and a sponge rubber strip to obtain an extrusion force value; according to the obtained extrusion force values, obtaining tensile stress values in the concrete at the corner parts of the outer sides of the two pipe pieces through numerical simulation calculation; obtaining a numerical value of the crack developing width according to the obtained tensile stress value and a preset standard formula, and comparing and judging the numerical value of the crack developing width with a numerical value A, wherein the numerical value A ranges from 0.05mm to 0.1 mm; if the numerical value of the developing width of the crack is not greater than the numerical value A, obtaining corresponding V-shaped steel bar parameters, wherein the V-shaped steel bar parameters comprise the diameter of the steel bar and the arrangement distance of the steel bar; according to the obtained V-shaped steel bar parameters, obtaining steel bar stress and steel bar area through a stress calculation formula of a longitudinal common steel bar in a tension area of the reinforced concrete member; and converting the diameter value and the space value of the V-shaped steel bar arranged at the corner part outside the pipe piece according to the obtained steel bar stress and the obtained steel bar area. The V-shaped reinforcing steel bar is arranged according to the diameter numerical value and the interval numerical value of the obtained V-shaped reinforcing steel bar, the corner area outside the duct piece can be strengthened, 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 favorably improved. Thereby reached and to have strengthened the tensile strength that shield tunnel section of jurisdiction outside bight concrete is favorable to improving waterproof nature's technological effect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings 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 it is obvious for those skilled in the art to obtain other drawings without creative efforts.
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 view of a device for waterproofing concrete at an outer corner of a shield tunnel segment according to an embodiment of the present invention;
fig. 3 is a segment joint numerical calculation stress cloud chart in the method for preventing concrete at the corner of the shield tunnel segment from water according to the embodiment of the invention;
fig. 4 is a first schematic view 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 second schematic diagram of a device for preventing concrete from water 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 preventing concrete at the corner part of the outer side of a shield tunnel segment from water, which comprises the following steps of extruding the joint of two segments by an elastic rubber sealing gasket and a sponge rubber strip to obtain an extrusion force value; according to the obtained extrusion force values, obtaining tensile stress values in the concrete at the corner parts of the outer sides of the two pipe pieces through numerical simulation calculation; obtaining a numerical value of the crack developing width according to the obtained tensile stress value and a preset standard formula, and comparing and judging the numerical value of the crack developing width with a numerical value A, wherein the numerical value A ranges from 0.05mm to 0.1 mm; if the numerical value of the developing width of the crack is not greater than the numerical value A, obtaining corresponding V-shaped steel bar 7 parameters, wherein the V-shaped steel bar 7 parameters comprise the diameter of a steel bar and the arrangement distance of the steel bar; according to the obtained parameters of the V-shaped steel bar 7, the stress of the steel bar and the area of the steel bar are obtained through a stress calculation formula of a longitudinal common steel bar in a tension area of the reinforced concrete member; and converting the diameter value and the space value of the V-shaped steel bar arranged at the corner part outside the pipe piece according to the obtained steel bar stress and the obtained steel bar area. The V-shaped reinforcing steel bars are arranged according to the diameter numerical value and the interval numerical value of the obtained V-shaped reinforcing 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 reached and to have strengthened the tensile strength that shield tunnel section of jurisdiction outside bight concrete is favorable to improving waterproof nature's technological effect.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention belong to the protection scope of the present invention; the "and/or" keyword referred to in this embodiment represents sum or two cases, in other words, a and/or B mentioned in the embodiment of the present invention represents two cases of a and B, A or B, and describes three states where a and B exist, such as a and/or B, which represents: only A does not include B; only B does not include A; including 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 describing one element or feature's relationship to another element or feature. It will be understood that the spatially relative terms are 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 "lower" would then be oriented "upper" other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device may be oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Also, in embodiments of the invention where an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used in the embodiments of the present invention are for illustrative purposes only and are not intended to limit the present invention.
Example one
Referring to fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, fig. 1 is a flowchart of a method for preventing concrete at an outer corner of a shield tunnel segment according to an embodiment of the present invention from being waterproofed, fig. 2 is a structural diagram of an apparatus for preventing concrete at an outer corner of a shield tunnel segment according to an embodiment of the present invention from being waterproofed, fig. 3 is a segment joint numerical calculation stress cloud chart in the method for preventing concrete at an outer corner of a shield tunnel segment according to an embodiment of the present invention, fig. 4 is a first schematic diagram of the apparatus for preventing concrete at an outer corner of a shield tunnel segment according to an embodiment of the present invention from being waterproofed, and fig. 5 is a second schematic diagram of the apparatus for preventing concrete at an outer corner of a shield tunnel segment according to an embodiment of the present invention. The embodiment of the invention provides a method for preventing concrete at the corner part outside a shield tunnel segment from water, which comprises the following steps:
s100, extruding the joint of the two pipe 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.
Particularly, set up main muscle 5 through outside a section of jurisdiction into U type muscle, set up main muscle 6 inboard with this section of jurisdiction into straight type muscle, U type muscle and straight type muscle interconnect. In the section of jurisdiction seam slot 4 in the junction between two sections of jurisdiction is installed to the sealed pad of elasticity rubber and sponge rubber strip, act on the junction of two sections of jurisdiction with the extrusion force of the sealed pad of elasticity rubber and sponge rubber strip (the sponge rubber strip can be located the sealed outside of elasticity) in two sections of jurisdiction (this junction can refer to and extrudes the face of installing the sealed pad of elasticity and sponge rubber strip in the section of jurisdiction). The configuration mode of the main ribs of the duct piece is set to be that the main ribs on the outer side are U-shaped ribs and the main ribs on the inner side are straight ribs, so that the range of a corner plain concrete area can be enlarged, and conditions are provided for the configuration of the reinforcing bars of the detailed structure. Meanwhile, extrusion force values are provided for the following step S110, namely, extrusion forces of the sealing gaskets on the outer sides of the joints and the sponge rubber strips to the pipe pieces act on the pipe pieces, and the tensile stress in corner concrete can be obtained by adopting a numerical analysis method.
Step S110, obtaining tensile stress values in concrete at corners on the outer sides of the two pipe pieces through numerical simulation calculation according to the obtained extrusion force values;
the step of obtaining tensile stress values in the concrete at the corner parts outside the two pipe pieces 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 the 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 pipe sheet structure in the plane strain model; after a plane strain model of the structure, the constraint and the load is built, stress calculation is carried out through software according to extrusion force numerical values to obtain a structural stress cloud chart, and the structural maximum tensile stress is extracted, and is the tensile stress value in the corner concrete on the outer side of the duct piece.
Particularly, after the extrusion force value is obtained in the step S100, a duct piece C60 concrete structure model can be established by adopting finite element calculation software, a plane strain model is adopted for simulation, the boundary condition is that the upper arc 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 duct piece structure. After a plane strain model of the structure, the constraint and the load is established, stress calculation is carried out through software to obtain a structural stress cloud picture (as shown in figure 3), and the maximum tensile stress of the structure is extracted. The tensile stress values in the concrete at the outboard corner of the duct piece are then provided for step S120 described below.
Step S120, obtaining a numerical value of the developing width of the crack according to the obtained tensile stress value and a preset standard formula, and comparing and judging the numerical value of the developing width of the crack with a numerical value A, wherein the numerical value A ranges from 0.05mm to 0.1mm (the numerical value is a large value when the water pressure is small, and the numerical value is a small value when the water pressure is large);
the preset specification formula comprises:
Figure BDA0003233138280000091
wherein said
Figure BDA0003233138280000092
For the value of the propagation width of the fracture, said αcrThe coefficient is a stress characteristic coefficient of the component, and psi is a coefficient of uneven strain of longitudinal tension steel bars among cracks; when the psi is less than 0.2, the psi is 0.2, and when the psi is more than 1.0, the psi is 1.0; for a component directly bearing repeated loads, the psi is 1.0; the sigmasThe normal longitudinal tension steel bar stress of the reinforced concrete member calculated according to the load quasi-permanent combination or the equivalent longitudinal tension steel bar stress of the prestressed concrete member calculated according to the standard combination; the Es is the elastic modulus of the steel bar, the Cs is the distance from the outer edge of the outermost longitudinal tension steel bar to the bottom edge of the tension area, when the Cs is less than 20, the Cs is 20, and when the Cs is more than 65, the Cs is 65; said p isteThe longitudinal tension steel bar is calculated according to the effective section area of the tension concrete; d iseqThe equivalent diameter of the longitudinal steel bar in the tension area; for the unbonded post-tensioning member, the equivalent diameter of the common steel bar longitudinally tensioned in the tension area is only.
Specifically, after the tensile stress value in the corner concrete at the outer side of the duct piece is obtained through the step S100 and the step S110, the preset design specification (namely, the formula 7.1.2-1 in the item 7.1.2 of the concrete structure design specification) is passed, and the development width of the crack (namely, the crack developed under the action of the tensile stress of the corner concrete of the duct piece is further passedSlot width) is not greater than a value a, the value a is greater than or equal to 0.05mm, and the value a is less than or equal to 0.1 mm. Numerical value of crack propagation width (i.e. crack propagation width)
Figure BDA0003233138280000101
) And comparing and judging with the value A, and providing the parameters of the V-shaped steel bar 7 provided in the following step S130 when the comparison result is that the numerical value of the crack development width is not more than the value A.
Step S130, if the numerical value of the crack developing width is not larger than the numerical value A, obtaining corresponding V-shaped steel bar parameters, wherein the V-shaped steel bar parameters comprise the diameter of a steel bar and the arrangement distance of the steel bar;
specifically, the crack propagation width value (i.e., the propagation width value) is determined according to the above-described steps S100, S110, and S120
Figure BDA0003233138280000102
) And in the process of comparing and judging with the value A, if the developing width value of the crack is not more than the value A, taking the diameter of the steel bar and the arrangement distance of the steel bar at the moment as the parameters of the corresponding V-shaped steel bar 7. The required V-shaped bead 7 parameters are then provided for the following step S140.
Step S140, according to the obtained V-shaped steel bar parameters, obtaining steel bar stress and steel bar area through a stress calculation formula of longitudinal common steel bars in a tension area 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 ordinary steel bar in the tension area of the reinforced concrete member in item 7.1.4 of the specification of concrete structure design, the steel bar stress can be calculated, and then the steel bar area As can be obtained.
And S150, converting the diameter value and the space value of the V-shaped steel bar arranged at the corner part of the outer side of the duct piece according to the obtained steel bar stress and the steel bar area.
Specifically, after the reinforcement stress and the reinforcement area are obtained according to the above steps S100, S110, S120, S130 and S140, those skilled in the art can directly calculate the diameter value and the pitch value of the V-shaped reinforcement disposed at the corner portion of the tube sheet outer side according to the reinforcement stress and the reinforcement area obtained according to the disclosure of the prior art.
The method for preventing the concrete at the corner part outside the shield tunnel segment provided by the embodiment of the invention further comprises the following steps: and (3) mounting the V-shaped steel bars to a mounting area on the outer side of the duct piece according to the converted diameter numerical value and the converted interval numerical value of the V-shaped steel bars, wherein the mounting area is close to the main bar 5 on the outer side of the duct piece.
Specifically, according to the diameter value and the interval value of the V-shaped steel bar converted in the above step S100, step S110, step S120, step S130, step S140 and step S150, the V-shaped steel bar is installed to the installation area outside the segment according to the diameter value and the interval value of the V-shaped steel bar, the installation area is close to the main bar 5 outside the segment, that is, after the configuration mode of the segment main bar 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 bar is arranged at the corner gap (i.e., the installation area) of the outer arc face left by the main bar 5 outside the segment set as the U-shaped bar, the concrete at the corner of the outer arc face at the waterproof gasket is protected, and the waterproof capability of the segment can be improved. The reinforcing bars, which are then arranged for the installation of the stressed reinforcing bars, may also be provided with the remaining construction bars. And the V-shaped reinforcing steel bars arranged at the corner part (namely the installation area) outside the shield tunnel segment are simpler and more convenient to install compared with reinforcing steel bar net arrangement, and the convenience and the construction reliability of construction are improved. Therefore, the range of a corner plain concrete area is enlarged, conditions are reserved for the arrangement of the concrete bars of the detailed structure, the tensile strength of corner concrete on the outer side of the duct piece can be enhanced through a reinforcement arrangement mode on the premise of not influencing the pouring quality of the corner concrete, construction is facilitated, and actual operation is facilitated. And then, the tensile strength of the concrete at the corner part outside the shield tunnel segment can be enhanced, and the waterproof performance is favorably improved.
The invention provides a method for preventing concrete at the corner part of the outer side of a shield tunnel segment from water, which comprises the following steps of extruding the joint of two segments by an elastic rubber sealing gasket and a sponge rubber strip to obtain an extrusion force value; according to the obtained extrusion force values, obtaining tensile stress values in the concrete at the corner parts of the outer sides of the two pipe pieces through numerical simulation calculation; obtaining a numerical value of the crack developing width according to the obtained tensile stress value and a preset standard formula, and comparing and judging the numerical value of the crack developing width with a numerical value A, wherein the numerical value A ranges from 0.05mm to 0.1 mm; if the numerical value of the developing width of the crack is not greater than the numerical value A, obtaining corresponding V-shaped steel bar 7 parameters, wherein the V-shaped steel bar 7 parameters comprise the diameter of a steel bar and the arrangement distance of the steel bar; according to the obtained parameters of the V-shaped steel bar 7, the stress of the steel bar and the area of the steel bar are obtained through a stress calculation formula of a longitudinal common steel bar in a tension area of the reinforced concrete member; and converting the diameter value and the space value of the V-shaped steel bar arranged at the corner part outside the pipe piece according to the obtained steel bar stress and the obtained steel bar area. The V-shaped reinforcing steel bar is arranged according to the diameter numerical value and the interval numerical value of the obtained V-shaped reinforcing steel bar, the corner area outside the segment can be reinforced, the tensile strength of concrete in the corner area outside the segment is enhanced, and the waterproof performance of the corner area outside the segment is favorably improved. Thereby reached and to have strengthened the tensile strength that shield tunnel section of jurisdiction outside bight concrete is favorable to improving waterproof nature's technological effect.
In order to explain the device for preventing the concrete at the outer corner of the shield tunnel segment provided by the invention in detail, the embodiment explains the method for preventing 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 preventing the concrete at the outer corner of the shield tunnel segment, which is shown in the second embodiment in detail.
Example two
The device for concrete waterproofing of the corner part outside the shield tunnel segment provided by the embodiment of the invention comprises an extrusion force numerical value acquisition module 200, a tensile stress value acquisition module 210, a comparison judgment module 220, a reinforcing steel bar parameter acquisition module 230, a reinforcing steel bar stress and area acquisition module 240 and a diameter and distance value acquisition module 250, wherein the extrusion force numerical 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 acquire an extrusion force numerical 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 corner portions outside the two duct pieces through numerical simulation calculation according to the obtained extrusion force values; wherein, according to the extrusion force numerical value, through numerical simulation calculation to obtain two tensile stress values in section of jurisdiction outside corner concrete includes: 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 the 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 pipe sheet structure in the plane strain model; after a plane strain model of the structure, the constraint and the load is built, stress calculation is carried out through software according to extrusion force numerical values to obtain a structural stress cloud chart, and the structural maximum tensile stress is extracted, and is the tensile stress value in the corner concrete on the outer side of the duct piece.
Meanwhile, the comparison and judgment module 220 is configured to obtain a fracture propagation width value according to the obtained tensile stress value and a preset standard formula, and compare and judge the fracture propagation width value with a value a, where the value range of the value a is 0.05mm to 0.1 mm; wherein, the preset specification formula comprises:
Figure BDA0003233138280000131
wherein said
Figure BDA0003233138280000132
For the value of the propagation width of the fracture, said αcrIs a stress characteristic coefficient of the component, and psi is a crackThe uneven strain coefficient of the longitudinal tension steel bars; when the psi is less than 0.2, the psi is 0.2, and when the psi is more than 1.0, the psi is 1.0; for a component directly bearing repeated loads, the psi is 1.0; the sigmasThe normal longitudinal tension steel bar stress of the reinforced concrete member calculated according to the load quasi-permanent combination or the equivalent longitudinal tension steel bar stress of the prestressed concrete member calculated according to the standard combination; the Es is the elastic modulus of the steel bar, the Cs is the distance from the outer edge of the outermost longitudinal tension steel bar to the bottom edge of the tension area, when the Cs is less than 20, the Cs is 20, and when the Cs is more than 65, the Cs is 65; said p isteThe longitudinal tension steel bar is calculated according to the effective section area of the tension concrete; d iseqThe equivalent diameter of the longitudinal steel bar in the tension area; for the unbonded post-tensioning member, the equivalent diameter of the common steel bar longitudinally tensioned in the tension area is only.
The steel bar parameter obtaining module 230 is configured to obtain a corresponding V-shaped steel bar 7 parameter if the developing width value of the crack is not greater than the value a, where the V-shaped steel bar 7 parameter includes a steel bar diameter and a steel bar arrangement interval; the steel bar stress and area obtaining module 240 is configured to obtain steel bar stress and steel bar area through a stress calculation formula of a longitudinal common steel bar in a tension region of the reinforced concrete member according to the obtained parameter of the V-shaped steel bar 7; the diameter and distance value obtaining module 250 is configured to convert the diameter value and the distance value of the V-shaped steel bar arranged at the corner of the duct piece outer side according to the obtained steel bar stress and the obtained steel bar area. The device for concrete waterproofing of the corner part outside the shield tunnel segment provided by the second embodiment of the invention further comprises an arranging and installing module 260, wherein the arranging and installing module 260 is used for installing the V-shaped steel bars to an installing area outside the segment according to the converted diameter numerical value and the converted distance numerical value of the V-shaped steel bars, and the installing area is close to the main bar 5 outside the segment.
The invention provides a device for preventing concrete at the corner part of the outer side of a shield tunnel segment from water, wherein an 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 acquire an extrusion force value; the tensile stress value obtaining module 210 is configured to obtain tensile stress values in the concrete at the corner portions outside the two duct pieces through numerical simulation calculation according to the obtained extrusion force values; the comparison and judgment module 220 is configured to obtain a fracture propagation width value according to the obtained tensile stress value and a preset standard formula, and compare and judge the fracture propagation width value with a value a, where a value range of the value a is 0.05mm to 0.1 mm; the steel bar parameter obtaining module 230 is configured to obtain a corresponding V-shaped steel bar 7 parameter if the developing width value of the crack is not greater than the value a, where the V-shaped steel bar 7 parameter includes a steel bar diameter and a steel bar arrangement interval; the steel bar stress and area obtaining module 240 is configured to obtain steel bar stress and steel bar area through a stress calculation formula of a longitudinal common steel bar in a tension region of the reinforced concrete member according to the obtained parameter of the V-shaped steel bar 7; the diameter and distance value obtaining module 250 is configured to convert the diameter value and the distance value of the V-shaped steel bar arranged at the corner of the duct piece outer side according to the obtained steel bar stress and the obtained steel bar area. The V-shaped reinforcing steel bar is arranged according to the diameter numerical value and the interval numerical value of the obtained V-shaped reinforcing steel bar, the corner area outside the segment can be reinforced, the tensile strength of concrete in the corner area outside the segment is enhanced, and the waterproof performance of the corner area outside the segment is favorably improved. Thereby reached and to have strengthened the tensile strength that shield tunnel section of jurisdiction outside bight concrete is favorable to improving waterproof nature's technological effect.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, 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 or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.

Claims (10)

1. A method for waterproofing concrete at the corner part outside a shield tunnel segment is characterized by comprising the following steps:
extruding the joint of the two pipe pieces through the elastic rubber sealing gasket and the sponge rubber strip to obtain an extrusion force value;
according to the obtained extrusion force values, obtaining tensile stress values in the concrete at the corner parts of the outer sides of the two pipe pieces through numerical simulation calculation;
obtaining a numerical value of the crack developing width according to the obtained tensile stress value and a preset standard formula, and comparing and judging the numerical value of the crack developing width with a numerical value A, wherein the numerical value A ranges from 0.05mm to 0.1 mm;
if the numerical value of the developing width of the crack is not greater than the numerical value A, obtaining corresponding V-shaped steel bar parameters, wherein the V-shaped steel bar parameters comprise the diameter of the steel bar and the arrangement distance of the steel bar;
according to the obtained V-shaped steel bar parameters, obtaining steel bar stress and steel bar area through a stress calculation formula of a longitudinal common steel bar in a tension area of the reinforced concrete member;
and converting the diameter value and the space value of the V-shaped steel bar arranged at the corner part outside the pipe piece according to the obtained steel bar stress and the obtained steel bar area.
2. The method for waterproofing shield tunnel segment outboard corner concrete according to claim 1, further comprising:
and installing the V-shaped steel bars to an installation area on the outer side of the duct piece according to the converted diameter numerical value and the converted interval numerical value of the V-shaped steel bars, wherein the installation area is close to the main bars on the outer side of the duct piece.
3. The method for waterproofing concrete for the outside corner of a shield tunnel segment according to claim 1, wherein:
the main muscle in the section of jurisdiction outside sets up to U type muscle, the inboard main muscle of section of jurisdiction sets up to straight type muscle.
4. The method for waterproofing shield tunnel segment outside corner concrete according to claim 1, wherein said obtaining tensile stress values in two of said segment outside corner concrete by numerical simulation calculation based on said obtained extrusion force values 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 the 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 pipe sheet structure in the plane strain model;
after a plane strain model of the structure, the constraint and the load is built, stress calculation is carried out through software according to extrusion force numerical values to obtain a structural stress cloud chart, and the structural maximum tensile stress is extracted, and is the tensile stress value in the corner concrete on the outer side of the duct piece.
5. The method for waterproofing shield tunnel segment outside corner concrete according to claim 1, wherein said predetermined specification formula includes:
Figure FDA0003233138270000021
wherein said
Figure FDA0003233138270000022
For the value of the propagation width of the fracture, said αcrThe coefficient is a stress characteristic coefficient of the component, and psi is a coefficient of uneven strain of longitudinal tension steel bars among cracks; when the psi is less than 0.2, the psi is 0.2, and when the psi is more than 1.0, the psi is 1.0; for a component directly bearing repeated loads, the psi is 1.0; the sigmasThe normal longitudinal tension steel bar stress of the reinforced concrete member calculated according to the load quasi-permanent combination or the equivalent longitudinal tension steel bar stress of the prestressed concrete member calculated according to the standard combination; es is the elastic modulus of the steel bar, Cs is the distance from the outer edge of the outermost longitudinal tension steel bar to the bottom edge of the tension area, and when Cs is less than 20, the Cs is the elastic modulus of the steel barCs 20, when said Cs > 65, then said Cs 65; said p isteThe longitudinal tension steel bar is calculated according to the effective section area of the tension concrete; d iseqThe equivalent diameter of the longitudinal steel bar in the tension area; for the unbonded post-tensioning member, the equivalent diameter of the common steel bar longitudinally tensioned in the tension area is only.
6. A device for preventing concrete at the corner part outside a shield tunnel segment from water is characterized by comprising:
the extrusion force numerical value acquisition module is used for extruding the joint of the two pipe pieces through the elastic rubber sealing gasket and the sponge rubber strip to acquire an extrusion force numerical value;
the tensile stress value acquisition module is used for acquiring tensile stress values in the concrete at the corner parts of the outer sides of the two duct pieces through numerical simulation calculation according to the acquired extrusion force values;
the comparison and judgment module is used for obtaining the developing width value of the crack according to the obtained tensile stress value and a preset standard formula, and comparing and judging the developing width value of the crack with a value A, wherein the value range of the value A is 0.05mm to 0.1 mm;
the steel bar parameter acquisition module is used for acquiring corresponding V-shaped steel bar parameters if the developing width value of the crack is not greater than the value A, wherein the V-shaped steel bar parameters comprise the diameter of the steel bar and the arrangement distance of the steel bar;
the steel bar stress and area acquisition module is used for acquiring steel bar stress and steel bar area according to the acquired V-shaped steel bar parameters through a stress calculation formula of a longitudinal common steel bar in a tension area of the reinforced concrete member;
and the diameter and interval value acquisition module is used for converting the diameter value and the interval value of the V-shaped steel bar arranged at the corner part outside the duct piece according to the obtained steel bar stress and the steel bar area.
7. The apparatus for waterproofing concrete for the outside corner portions of shield tunnel segments according to claim 6, wherein said apparatus further comprises:
and the arrangement and installation module is used for installing the V-shaped steel bars to the installation area on the outer side of the duct piece according to the converted diameter numerical value and the converted interval numerical value of the V-shaped steel bars, and the installation area is close to the main bars on the outer side of the duct piece.
8. The apparatus of claim 6, wherein the shield tunnel segment is provided with a waterproof device for concrete at the outer corner thereof, wherein the waterproof device comprises:
the main muscle in the section of jurisdiction outside sets up to U type muscle, the inboard main muscle of section of jurisdiction sets up to straight type muscle.
9. The apparatus for waterproofing shield tunnel segment outside corner concrete according to claim 6, wherein said obtaining tensile stress values in two of said segment outside corner concrete by numerical simulation calculation based on said obtained extrusion force values comprises:
the step of obtaining tensile stress values in the concrete at the corner parts outside the two pipe pieces 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 the 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 pipe sheet structure in the plane strain model;
after a plane strain model of the structure, the constraint and the load is built, stress calculation is carried out through software according to extrusion force numerical values to obtain a structural stress cloud chart, and the structural maximum tensile stress is extracted, and is the tensile stress value in the corner concrete on the outer side of the duct piece.
10. The apparatus for waterproofing shield tunnel segment outside corner concrete according to claim 6, wherein said predetermined specification formula includes:
Figure FDA0003233138270000041
wherein said
Figure FDA0003233138270000042
For the value of the propagation width of the fracture, said αcrThe coefficient is a stress characteristic coefficient of the component, and psi is a coefficient of uneven strain of longitudinal tension steel bars among cracks; when the psi is less than 0.2, the psi is 0.2, and when the psi is more than 1.0, the psi is 1.0; for a component directly bearing repeated loads, the psi is 1.0; the sigmasThe normal longitudinal tension steel bar stress of the reinforced concrete member calculated according to the load quasi-permanent combination or the equivalent longitudinal tension steel bar stress of the prestressed concrete member calculated according to the standard combination; the Es is the elastic modulus of the steel bar, the Cs is the distance from the outer edge of the outermost longitudinal tension steel bar to the bottom edge of the tension area, when the Cs is less than 20, the Cs is 20, and when the Cs is more than 65, the Cs is 65; said p isteThe longitudinal tension steel bar is calculated according to the effective section area of the tension concrete; d iseqThe equivalent diameter of the longitudinal steel bar in the tension area; for the unbonded post-tensioning member, the equivalent diameter of the common steel bar longitudinally tensioned in the tension area is only.
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