CN118065561A - CTRC-steel pipe semi-assembled RC column facing marine environment and preparation method - Google Patents
CTRC-steel pipe semi-assembled RC column facing marine environment and preparation method Download PDFInfo
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- CN118065561A CN118065561A CN202410029551.4A CN202410029551A CN118065561A CN 118065561 A CN118065561 A CN 118065561A CN 202410029551 A CN202410029551 A CN 202410029551A CN 118065561 A CN118065561 A CN 118065561A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 331
- 239000010959 steel Substances 0.000 title claims abstract description 331
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 57
- 239000004917 carbon fiber Substances 0.000 claims abstract description 57
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 57
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 18
- 230000000712 assembly Effects 0.000 claims abstract description 11
- 238000000429 assembly Methods 0.000 claims abstract description 11
- 238000004210 cathodic protection Methods 0.000 claims abstract description 5
- 230000005611 electricity Effects 0.000 claims abstract description 3
- 239000004567 concrete Substances 0.000 claims description 61
- 239000002985 plastic film Substances 0.000 claims description 15
- 229920006255 plastic film Polymers 0.000 claims description 15
- 239000011248 coating agent Substances 0.000 claims description 12
- 238000000576 coating method Methods 0.000 claims description 12
- 230000004224 protection Effects 0.000 claims description 12
- 230000006835 compression Effects 0.000 claims description 8
- 238000007906 compression Methods 0.000 claims description 8
- 230000002787 reinforcement Effects 0.000 claims description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 6
- 239000011889 copper foil Substances 0.000 claims description 6
- 239000000835 fiber Substances 0.000 claims description 6
- 239000013535 sea water Substances 0.000 claims description 6
- 238000005260 corrosion Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 230000007797 corrosion Effects 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 3
- 239000000460 chlorine Substances 0.000 claims description 3
- 229910052801 chlorine Inorganic materials 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000005476 soldering Methods 0.000 claims description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims 1
- 239000003513 alkali Substances 0.000 abstract 1
- 239000002689 soil Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 90
- 238000010276 construction Methods 0.000 description 16
- 230000000452 restraining effect Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
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- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000003841 chloride salts Chemical class 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
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Abstract
The invention discloses a CTRC-steel pipe semi-assembled RC column facing marine environment and a preparation method thereof, wherein the RC column comprises an inner steel pipe, a TRC shell, a core reinforced concrete layer and an external power supply; the inner steel tube comprises a plurality of inner steel tube assemblies which are coaxially stacked in sequence from top to bottom; each inner layer steel tube assembly comprises inner layer steel tube segments and connecting steel bars for connecting longitudinal steel bars; the TRC shell comprises a carbon fiber woven mesh which can conduct electricity; the negative electrode of the external power supply is connected with the longitudinal steel bars in an electrified way, and the positive electrode is connected with each circle of carbon fiber woven mesh in an electrified way. The invention uses the carbon fiber woven mesh in the TRC shell as an anode and uses the impressed current cathodic protection method to protect the internal steel skeleton by taking the carbon fiber woven mesh bundles as the anode and the internal steel skeleton as the cathode, thereby effectively improving the overall durability of the structure, and being particularly suitable for projects such as buildings, bridges and the like in severe environments which are easy to corrode, such as ocean, wet, salty land, saline-alkali soil and the like.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to a CTRC-steel pipe semi-assembled RC column facing to marine environment and a preparation method.
Background
The traditional concrete-filled steel tube column can effectively overcome the defects of high brittleness and poor ductility of concrete by placing the concrete under the constraint of an outer layer steel tube, has the advantages of high bearing capacity, convenient construction and the like, and is widely applied; however, in the marine environment, the outer layer steel pipe of the steel pipe concrete column is easy to be corroded by the chloride salt environment, and the durability problem is particularly remarkable, so that development of a concrete structure suitable for the marine environment is needed.
With the improvement of environmental protection requirements of the civil construction industry in recent years in China, the price of materials such as steel, concrete and the like is increased, so that the cost of the traditional solid concrete column is higher and higher, and the related energy sources such as material conservation and the like are also a big problem facing the current civil construction industry. The traditional concrete filled steel tube column is mainly in the form of a solid section column, and the traditional concrete filled steel tube column is used as an axial compression member or a bending member with smaller load eccentricity and good performance. When the solid steel pipe concrete column bears the load with larger eccentricity, the bearing capacity is mainly controlled by bending rigidity, and the concrete with the section close to the centroid part has smaller contribution to the bending rigidity, but the dead weight of the component is increased, so that the economic cost can be effectively reduced by adopting the hollow section.
The traditional concrete hollow column has large welding workload when a reinforcement cage is buried, no good construction space exists, and construction is difficult; in addition, the template needs to be supported in the production and manufacturing process, after pouring is completed, demolding is needed, the template mounting and dismounting engineering quantity in the process is large, the service cycle is long, the personnel and equipment are more, and the process is complex.
In view of the above, it is necessary to invent a concrete hollow column which is oriented to the marine corrosive environment, has good economic effect, convenient construction and reliable quality, and meets industrialization.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a CTRC-steel pipe semi-assembled RC column facing the marine environment and a preparation method thereof, wherein the CTRC-steel pipe semi-assembled RC column facing the marine environment is prepared by compounding and restraining core area concrete through inner steel pipes and TRC shells, forming inner steel pipes and prefabricated TRC shells by utilizing inner steel pipe assemblies in a rapid combination way, and adopting an impressed current cathode protection method, thereby solving the problems of insufficient structural durability, long construction period, overlarge economic cost and the like.
In order to solve the technical problems, the invention adopts the following technical scheme:
A CTRC-steel pipe semi-assembled RC column facing marine environment comprises an inner steel pipe, a TRC shell, a core reinforced concrete layer and an external power supply.
The core reinforced concrete layer comprises a core concrete column and longitudinal steel bars buried in the core concrete column.
The inner steel tube comprises a plurality of inner steel tube assemblies which are coaxially stacked in sequence from top to bottom.
Each inner layer steel tube assembly includes an inner layer steel tube segment and at least one turn of tie bars.
Each circle of connecting bars comprises a plurality of connecting bars which are uniformly distributed along the periphery of the inner layer steel pipe section, and each connecting bar is distributed along the radial direction of the inner layer steel pipe section; the inner side end of each connecting steel bar is connected with the inner layer steel tube segment, each connecting steel bar is provided with at least one longitudinal steel bar trepanning, and each longitudinal steel bar trepanning is longitudinally inserted with one longitudinal steel bar.
The core concrete column is poured between the inner steel pipe and the TRC shell.
The TRC housing includes at least one loop of carbon fiber woven mesh capable of conducting electricity.
The negative electrode of the external power supply is connected with the longitudinal steel bar in an electrifying way; the positive electrode of the external power supply is electrically connected with each circle of carbon fiber woven net.
Each connecting steel bar is 8-shaped and is provided with two longitudinal steel bar trepanning holes.
The inner side end of each connecting steel bar is connected with the inner layer steel pipe section through threads.
Each inner layer steel pipe assembly comprises two rings of connecting steel bars, namely a top ring connecting steel bar and a bottom ring connecting steel bar.
The top ring connecting steel bars are arranged on the periphery of the top of the corresponding inner layer steel pipe section and are provided with N connecting steel bars.
The bottom ring connecting steel bars are arranged at the periphery of the bottom of the corresponding inner layer steel pipe section and are provided with N connecting steel bars.
N connecting steel bars in the top ring connecting steel bars and N connecting steel bars in the bottom ring connecting steel bars are distributed in a staggered mode in the circumferential direction.
N=3; 3 connecting steel bars in the top ring connecting steel bars are distributed in a regular triangle; 3 of the bottom ring connecting reinforcements are distributed in an inverted triangle.
The inner steel tube and the TRC shell play a role in binding the core reinforced concrete layer in a complex manner, so that the compression resistance of the core reinforced concrete layer can be improved; assuming that the total axial pressure bearable by CTRC-steel pipe semi-assembled RC column is F T, the calculation formula of F T is as follows:
FT＝Fc+Fe
Wherein:
Fc＝fcAc+fyAs
Fe＝(σr+σsv)Ac
Wherein F c is the axial bearing capacity provided by the core reinforced concrete layer.
And F e is the additional axial pressure bearing capacity provided by the inner steel pipe, the TRC shell and the connecting steel bar constraint core reinforced concrete layer.
And f c is the axial compression strength of the core reinforced concrete layer.
A c is the effective cross-sectional area of the core concrete column.
And f y is the yield strength of the longitudinal rebar.
A s is the total cross-sectional area of the longitudinal rebar.
Σ r is the radial compressive stress to which the inner steel tube and the TRC shell constraint core concrete column are subjected.
Σ sv is the radial compressive stress to which the tie bars constrain the core concrete column.
N is the number of layers or turns of the carbon fiber woven mesh in the TRC shell.
And f f is the ultimate tensile strength of the fibers in the carbon fiber woven mesh.
A f is the cross-sectional area of single Shu Wei fiber in the carbon fiber woven mesh;
And f a is the yield strength of the inner steel pipe.
S 1 is the grid spacing of the carbon fiber woven mesh.
D a is the wall thickness of the inner steel pipe.
D 1 is the distance between the inner steel pipe and the TRC housing.
A is the number of turns of the connecting steel bars arranged on the periphery of the inner layer steel pipe section.
N is the number of the interlinking steel bars contained in one circle of interlinking steel bars.
And f yv is the yield strength of the tie bar.
A yv is the cross-sectional area of the tie bar.
D 2 is the inner diameter of the TRC housing.
S 2 is the vertical height of one inner steel pipe segment.
The external power supply is a solar external power supply facility.
A preparation method of CTRC-steel pipe semi-assembled RC column facing marine environment comprises the following steps:
Step 1, prefabricating an inner layer steel pipe assembly: preparing a plurality of inner layer steel pipe sections; arranging a circle of connecting steel bars on the periphery of each inner layer steel pipe section; each circle of connecting steel bars comprises N connecting steel bars which are uniformly distributed along the circumferential direction; each connecting steel bar is provided with b longitudinal steel bar trepanning holes; wherein a is more than or equal to 1; n is more than or equal to 2; b is more than or equal to 1.
When a is more than or equal to 2, two adjacent rings of connecting steel bars are distributed in a circumferential staggered way.
At the same cross section, a×n×b longitudinal rebar trepanning will be formed.
Step 2, prefabricating a TRC shell: preparing a TRC shell comprising n layers of carbon fiber woven meshes, wherein each layer of carbon fiber woven mesh is provided with an external lead.
Step 3, positioning the longitudinal steel bars: the a multiplied by N multiplied by b longitudinal steel bars are uniformly distributed in N circles along the circumferential direction and correspond to the positions of the trepanning holes of the a multiplied by N multiplied by b longitudinal steel bars one by one.
And 4, splicing the inner steel pipe, which specifically comprises the following steps:
Step 4-1, hoisting: and (3) hoisting the inner layer steel pipe assembly prefabricated in the step (1) to the position right above the positioned longitudinal steel bars, and enabling the a multiplied by N multiplied by b longitudinal steel bar trepanning of the inner layer steel pipe assembly to be located right above the corresponding longitudinal steel bars.
Step 4-2, sleeving longitudinal steel bars: the height of the inner layer steel pipe assembly is reduced, so that the a multiplied by N multiplied by b longitudinal steel bar trepanning of the inner layer steel pipe assembly is sleeved on the periphery of the corresponding longitudinal steel bar; the inner layer steel pipe assembly continues to descend to the very bottom.
Step 4-3, splicing: repeating the steps 4-1 to 4-2 until all the set inner layer steel pipe assemblies are sleeved; at this time, all inner layer steel pipe assemblies are stacked up and down to form an assembled inner steel pipe; the inner steel pipe and the longitudinal steel bar are formed into a steel skeleton together.
Step 5, mounting a TRC shell: hoisting the TRC shell prefabricated in the step 2 to the position right above the assembled inner steel pipe in the step 4, and then lowering the height of the TRC shell to the bottommost part, and coaxially sleeving the TRC shell on the periphery of the longitudinal steel bar of the outermost ring.
And step 6, pouring: and pouring core concrete between the inner steel pipe and the TRC shell and curing, so as to form the double-wall restraining column.
Step 7, electrifying: the negative electrode of the external power supply is connected with the longitudinal steel bars in an energized mode, and the positive electrode of the external power supply is connected with external wires of the n layers of carbon fiber woven meshes in an energized mode, so that an external current cathode protection circuit ICCP is formed; wherein, n layers of carbon fiber woven mesh are used as auxiliary anodes of an impressed current cathodic protection circuit ICCP; the external power supply continuously transmits electrons to the inner steel pipe through the longitudinal steel bars and the connecting steel bars, so that on one hand, the electrons loss of the steel skeleton can be inhibited, and further the corrosion of the steel skeleton by seawater is inhibited; on the other hand, chloride ions in the seawater migrate to the auxiliary anode, and a chlorine evolution reaction occurs at the auxiliary anode, so that the content of chloride ions penetrating into the core reinforced concrete layer and the steel skeleton is reduced.
In step 1, a=2; n=3; b=2; at the same cross section, 12 longitudinal rebar trepanning will be formed.
In step 2, the preparation method of the TRC shell comprises the following steps:
Step 2-1, paving a plastic film: and selecting a PVC pipe with a set size specification, paving a layer of plastic film on the PVC pipe, and uniformly coating an interface adhesive on the plastic film.
Step 2-2, preparing a carbon fiber woven mesh: and (3) coating conductive silver paste on the connection part of the wires of the carbon fiber woven net, clamping and firmly adhering the conductive silver paste by using a copper foil, and finally welding the wires on the copper foil by using a tin soldering method, thereby manufacturing the carbon fiber woven net with the wires.
Step 2-3, coating fine aggregate concrete: and coating a layer of fine aggregate concrete on the plastic film to form a first layer of fine aggregate concrete.
Step 2-4, paving a carbon fiber woven net: and (3) paving a layer of carbon fiber woven mesh prepared in the step (2-2) on the outer side of the first layer of fine aggregate concrete.
And step 2-5, repeating the steps 2-3 to 2-4, and finishing the laying of the n layers of carbon fiber woven meshes until the design thickness is reached and curing is carried out.
Step 2-6, forming a TRC shell: and after curing is completed, removing the internal PVC pipe and the plastic film to form the TRC shell.
The invention has the following beneficial effects:
1. Economic cost is saved: compared with the traditional concrete column, the hollow section is adopted, so that the concrete pouring quantity can be effectively reduced on the premise of ensuring the structural performance, the dead weight of the structure is reduced, the economic cost is saved, and the hollow section concrete column is suitable for concrete columns with larger section requirements.
2. Improving mechanical properties: the invention improves the stress performance of the core concrete by compounding the inner steel pipe wall and the TRC shell with the constraint concrete. In addition, the double-row annular longitudinal bars are adopted, and the longitudinal bars can directly provide axial bearing capacity, so that the compression performance of the double-wall restraining column is effectively improved.
3. The corrosion resistance is good: the double-wall restraining column of the TRC shell is adopted, the durability is better in the marine environment, the TRC shell is used as a protective layer of the double-wall restraining column, the steel skeleton can be effectively prevented from being directly exposed in the marine environment, and the passive protection effect of the TRC shell is exerted. In addition, the carbon fiber woven mesh in the TRC is made of conductive materials, and the shells are uniformly distributed around the double-wall constraint column, so that an external current cathode protection method can be adopted, the TRC shell serves as an auxiliary anode, the electronic process of power failure of an internal steel skeleton is restrained, and the active protection effect of the TRC is exerted. The two protections act together, so that the durability of the whole structure is greatly improved.
4. Shortening the construction period: the marine environment has high construction requirements and quick construction is generally required. The invention adopts a semi-assembly process, and when in construction, the holes of the connecting ribs in the inner layer steel pipe assembly are only required to be aligned with the positions of the longitudinal steel bars for hoisting, so that the inner layer steel pipe walls of the structure can be quickly assembled and spliced, the positioning is simple and convenient, and the problem that the steel bars are difficult to weld on site of the traditional double-wall restraining column is avoided. In addition, the inner steel pipe and the TRC shell can be respectively used as an inner supporting plate and a permanent outer template for pouring core concrete, and the templates do not need to be additionally supported, so that the site construction process is simplified, and the site construction is faster and more efficient.
Drawings
FIG. 1 shows a schematic structural diagram of a CTRC-steel pipe semi-assembled RC column for marine environments.
Fig. 2 shows a three-dimensional schematic of the inner layer steel tube assembly of the present invention.
Fig. 3 shows a schematic view of the combined connection of the inner layer steel tube assembly and the longitudinal steel bars of the present invention.
Fig. 4 shows a cross-sectional view of the inner layer steel tube assembly of the present invention in conjunction with longitudinal rebar.
Fig. 5 shows a schematic diagram of the impressed current cathodic protection method of the present invention.
Fig. 6 shows a force analysis chart of the restraining effect of the TRC outer shell and inner steel tube of the present invention on core concrete.
Fig. 7 shows a force analysis of the constraining effect of the tie bars of the present invention on core concrete.
The method comprises the following steps:
1. an inner layer steel pipe assembly; 11. an inner layer steel pipe section; 12. connecting steel bars; 13. a connection hole;
2. a core reinforced concrete layer; 21. longitudinal steel bars;
3. A TRC housing; 31. a carbon fiber woven mesh;
4. And (5) externally applying a power supply.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings and specific preferred embodiments.
In the description of the present invention, it should be understood that the terms "left", "right", "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and "first", "second", etc. do not indicate the importance of the components, and thus are not to be construed as limiting the present invention. The specific dimensions adopted in the present embodiment are only for illustrating the technical solution, and do not limit the protection scope of the present invention.
As shown in FIG. 1, the CTRC-steel pipe semi-assembled RC column facing the marine environment comprises an inner steel pipe, a TRC shell 3, a core reinforced concrete layer 2 and an external power supply 4.
The core reinforced concrete layer includes a core concrete column and longitudinal reinforcement 21 buried in the core concrete column.
As shown in fig. 2,3 and 4, the inner steel pipe includes a plurality of inner steel pipe assemblies 1 coaxially stacked in order from top to bottom. Each inner layer steel tube assembly 1 comprises an inner layer steel tube segment 11 and at least one turn of tie bars 12.
Each circle of connecting bars comprises a plurality of connecting bars which are uniformly distributed along the periphery of the inner layer steel pipe section, and each connecting bar is distributed along the radial direction of the inner layer steel pipe section; the inner side end of each connecting steel bar is connected with the inner layer steel tube segment, each connecting steel bar is provided with at least one longitudinal steel bar trepanning, and each longitudinal steel bar trepanning is longitudinally inserted with one longitudinal steel bar.
In this embodiment, two rings of tie bars, i.e., top ring tie bars and bottom ring tie bars, are preferred.
The top ring connecting steel bars are arranged on the periphery of the top of the corresponding inner layer steel pipe section and are provided with N connecting steel bars.
The bottom ring connecting steel bars are arranged at the periphery of the bottom of the corresponding inner layer steel pipe section and are provided with N connecting steel bars.
N connecting steel bars in the top ring connecting steel bars and N connecting steel bars in the bottom ring connecting steel bars are distributed in a staggered mode in the circumferential direction.
Further, in the present embodiment, n=3 is preferable; 3 connecting steel bars in the top ring connecting steel bars are distributed in a regular triangle; 3 of the bottom ring connecting reinforcements are distributed in an inverted triangle.
Furthermore, each connecting steel bar is preferably 8-shaped and is provided with two longitudinal steel bar trepanning holes.
Connecting holes 13 are reserved at the connecting steel bar installation positions of each inner layer steel tube segment, and the inner side end (preferably a threaded rod) of each connecting steel bar is connected with the connecting holes of the inner layer steel tube segments through threads.
The core concrete column is poured between the inner steel pipe and the TRC shell.
The TRC housing comprises at least one ring of electrically conductive carbon fiber woven mesh 31 and fine aggregate concrete. Wherein, the carbon fiber fabric net is used as a reinforcing rib, and the fine aggregate concrete is used as a matrix.
As shown in fig. 5, the negative electrode of the external power supply 4 is electrically connected with the longitudinal steel bar; the positive electrode of the external power supply is electrically connected with each circle of carbon fiber woven net. The longitudinal steel bars are connected to the inner steel skeleton by tie bars, thereby establishing an electron transfer path between the TRC housing and the inner steel skeleton.
In this embodiment, the external power source is preferably a solar external power source facility, and a solar direct current power source is adopted.
As shown in fig. 6 and 7, the inner steel pipe and the TRC casing act in a composite binding manner on the core reinforced concrete layer, so that the compression resistance of the core reinforced concrete layer can be increased; assuming that the total axial pressure bearable by CTRC-steel pipe semi-assembled RC column is F T, the calculation formula of F T is as follows:
FT＝Fc+Fe
Wherein:
Fc＝fcAc+fyAs
Fe＝(σr+σsv)Ac
Wherein F c is the axial bearing capacity provided by the core reinforced concrete layer.
And F e is the additional axial pressure bearing capacity provided by the inner steel pipe, the TRC shell and the connecting steel bar constraint core reinforced concrete layer.
And f c is the axial compression strength of the core reinforced concrete layer.
A c is the effective cross-sectional area of the core concrete column.
And f y is the yield strength of the longitudinal rebar.
A s is the total cross-sectional area of the longitudinal rebar.
Σ r is the radial compressive stress to which the inner steel tube and the TRC shell constraint core concrete column are subjected.
Σ sv is the radial compressive stress to which the tie bars constrain the core concrete column.
N is the number of layers or turns of the carbon fiber woven mesh in the TRC shell.
And f f is the ultimate tensile strength of the fibers in the carbon fiber woven mesh.
A f is the cross-sectional area of single Shu Wei fiber in the carbon fiber woven mesh;
And f a is the yield strength of the inner steel pipe.
S 1 is the grid spacing of the carbon fiber woven mesh.
D a is the wall thickness of the inner steel pipe.
D 1 is the distance between the inner steel pipe and the TRC housing.
A is the number of turns of the connecting steel bars arranged on the periphery of the inner layer steel pipe section.
N is the number of the interlinking steel bars contained in one circle of interlinking steel bars.
And f yv is the yield strength of the tie bar.
A yv is the cross-sectional area of the tie bar.
D 2 is the inner diameter of the TRC housing.
S 2 is the vertical height of one inner steel pipe segment.
A preparation method of CTRC-steel pipe semi-assembled RC column facing marine environment comprises the following steps.
Step 1, prefabricating an inner layer steel pipe assembly: preparing a plurality of inner layer steel pipe sections; arranging a circle of connecting steel bars on the periphery of each inner layer steel pipe section; each circle of connecting steel bars comprises N connecting steel bars which are uniformly distributed along the circumferential direction; each connecting steel bar is provided with b longitudinal steel bar trepanning holes; wherein a is more than or equal to 1; n is more than or equal to 2; b is more than or equal to 1.
When a is more than or equal to 2, two adjacent rings of connecting steel bars are distributed in a circumferential staggered way.
At the same cross section, a×n×b longitudinal rebar trepanning will be formed. Based on the dislocation arrangement mode, the section of the inner layer steel pipe assembly at the combined connection part is provided with 6 connecting steel bars.
In this embodiment, a=2 is preferable; n=3; b=2; at the same cross section, 12 longitudinal rebar trepanning will be formed.
Step 2, prefabricating a TRC shell: preparing a TRC shell comprising n layers of carbon fiber woven meshes, wherein each layer of carbon fiber woven mesh is provided with an external lead.
The preparation method of the TRC casing preferably comprises the following steps.
Step 2-1, paving a plastic film: and selecting a PVC pipe with a set size specification, paving a layer of plastic film on the PVC pipe, and uniformly coating an interface adhesive on the plastic film.
Step 2-2, preparing a carbon fiber woven mesh: and (3) coating conductive silver paste on the connection part of the wires of the carbon fiber woven net, clamping and firmly adhering the conductive silver paste by using a copper foil, and finally welding the wires on the copper foil by using a tin soldering method, thereby manufacturing the carbon fiber woven net with the wires.
Step 2-3, coating fine aggregate concrete: and coating a layer of fine aggregate concrete on the plastic film to form a first layer of fine aggregate concrete.
Step 2-4, paving a carbon fiber woven net: and (3) paving a layer of carbon fiber woven mesh prepared in the step (2-2) on the outer side of the first layer of fine aggregate concrete.
And step 2-5, repeating the steps 2-3 to 2-4, and finishing the laying of the n layers of carbon fiber woven meshes until the design thickness is reached and curing is carried out.
Step 2-6, forming a TRC shell: and after curing is completed, removing the internal PVC pipe and the plastic film to form the TRC shell.
Step3, positioning the longitudinal steel bars: preferably, the a×n×b longitudinal bars are uniformly distributed in N circles along the circumferential direction by adopting a positioning fixture (such as a column bar distance frame, etc.), and the positions of the trepanning of the a×n×b longitudinal bars are in one-to-one correspondence.
And 4, splicing the inner steel pipe, which specifically comprises the following steps:
Step 4-1, hoisting: and (3) hoisting the inner layer steel pipe assembly prefabricated in the step (1) to the position right above the positioned longitudinal steel bars, and enabling the a multiplied by N multiplied by b longitudinal steel bar trepanning of the inner layer steel pipe assembly to be located right above the corresponding longitudinal steel bars.
Step 4-2, sleeving longitudinal steel bars: the height of the inner layer steel pipe assembly is reduced, so that the a multiplied by N multiplied by b longitudinal steel bar trepanning of the inner layer steel pipe assembly is sleeved on the periphery of the corresponding longitudinal steel bar; the inner layer steel pipe assembly continues to descend to the very bottom.
Step 4-3, splicing: repeating the steps 4-1 to 4-2 until all the set inner layer steel pipe assemblies are sleeved; at this time, all inner layer steel pipe assemblies are stacked up and down to form an assembled inner steel pipe; the inner steel pipe and the longitudinal steel bar are formed into a steel skeleton together.
Step 5, mounting a TRC shell: hoisting the TRC shell prefabricated in the step 2 to the position right above the assembled inner steel pipe in the step 4, and then lowering the height of the TRC shell to the bottommost part, and coaxially sleeving the TRC shell on the periphery of the longitudinal steel bar of the outermost ring.
And step 6, pouring: and pouring core concrete between the inner steel pipe and the TRC shell and curing, so as to form the double-wall restraining column.
Step 7, electrifying: the negative electrode of the external power supply is connected with the longitudinal steel bars in an energized mode, and the positive electrode of the external power supply is connected with external wires of the n layers of carbon fiber woven meshes in an energized mode, so that an external current cathode protection circuit ICCP is formed; wherein, n layers of carbon fiber woven mesh are used as auxiliary anodes of an impressed current cathodic protection circuit ICCP; the external power supply continuously transmits electrons to the inner steel pipe through the longitudinal steel bars and the connecting steel bars, so that on one hand, the electrons loss of the steel skeleton can be inhibited, and further the corrosion of the steel skeleton by seawater is inhibited; on the other hand, chloride ions in the seawater migrate to the auxiliary anode, and a chlorine evolution reaction occurs at the auxiliary anode, so that the content of chloride ions penetrating into the core reinforced concrete layer and the steel skeleton is reduced.
The reaction formulas of the anode and the cathode are respectively as follows:
2Cl --2e-→Cl2 (anode)
Fe 2++2e- -Fe (cathode)
According to the invention, by adopting the inner layer steel pipe and the TRC shell, the core concrete can be effectively restrained under the condition of considering economic effects, so that the bearing capacity of the RC column shaft pressure is improved. The semi-assembled RC column does not need to additionally support a template when pouring core concrete, an inner steel pipe can be used as an inner supporting plate, a TRC shell can be used as a permanent outer template, the construction process can be effectively simplified, and the formwork supporting materials are saved. In addition, the carbon fiber woven mesh bundles are used as anodes and the inner steel skeleton is used as cathodes by utilizing the excellent conductivity of the carbon fiber woven mesh in the TRC shell and using an impressed current cathode protection method, so that the inner steel skeleton is protected, and the overall durability of the structure is effectively improved. The invention can improve the mechanical property, bending rigidity, compressive strength, anti-seismic property and anti-corrosion property of the hollow pipe column; the construction is convenient, the construction period is shortened, and the economic effect is good; is especially suitable for the projects such as buildings, bridges and the like under the severe environments which are easy to be corroded, such as ocean, wet, saline land and the like.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various equivalent changes can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the equivalent changes belong to the protection scope of the present invention.
Claims (10)
1. CTRC-steel pipe semi-assembled RC column towards marine environment, its characterized in that: comprises an inner steel pipe, a TRC shell, a core reinforced concrete layer and an external power supply;
The core reinforced concrete layer comprises a core concrete column and longitudinal steel bars buried in the core concrete column;
the inner steel tube comprises a plurality of inner steel tube assemblies which are coaxially stacked in sequence from top to bottom;
each inner layer steel pipe assembly comprises an inner layer steel pipe section and at least one circle of connecting steel bars;
each circle of connecting bars comprises a plurality of connecting bars which are uniformly distributed along the periphery of the inner layer steel pipe section, and each connecting bar is distributed along the radial direction of the inner layer steel pipe section; the inner side end of each connecting steel bar is connected with the inner layer steel tube section, each connecting steel bar is provided with at least one longitudinal steel bar trepanning, and each longitudinal steel bar trepanning is longitudinally inserted with one longitudinal steel bar;
The core concrete column is poured between the inner steel pipe and the TRC shell;
The TRC housing comprises at least one circle of carbon fiber woven mesh capable of conducting electricity;
The negative electrode of the external power supply is electrically connected with the longitudinal steel bars; the positive electrode of the external power supply is electrically connected with each circle of carbon fiber woven net.
2. The marine environment-oriented CTRC-steel pipe semi-fabricated RC column of claim 1, wherein: each connecting steel bar is 8-shaped and is provided with two longitudinal steel bar trepanning holes.
3. Marine environment facing CTRC-steel pipe semi-fabricated RC column according to claim 1 or 2, characterized in that: the inner side end of each connecting steel bar is connected with the inner layer steel pipe section through threads.
4. Marine environment facing CTRC-steel pipe semi-fabricated RC column according to claim 1 or 2, characterized in that: each inner layer steel pipe assembly comprises two rings of connecting steel bars, namely a top ring connecting steel bar and a bottom ring connecting steel bar;
The top ring connecting steel bars are arranged on the periphery of the top of the corresponding inner layer steel pipe section and are provided with N connecting steel bars;
the bottom ring connecting steel bars are arranged at the periphery of the bottom of the corresponding inner layer steel pipe section and are provided with N connecting steel bars;
n connecting steel bars in the top ring connecting steel bars and N connecting steel bars in the bottom ring connecting steel bars are distributed in a staggered mode in the circumferential direction.
5. The marine environment-oriented CTRC-steel pipe semi-fabricated RC column of claim 4, wherein: n=3; 3 connecting steel bars in the top ring connecting steel bars are distributed in a regular triangle; 3 of the bottom ring connecting reinforcements are distributed in an inverted triangle.
6. The marine environment-oriented CTRC-steel pipe semi-fabricated RC column of claim 1, wherein: the inner steel tube and the TRC shell play a role in binding the core reinforced concrete layer in a complex manner, so that the compression resistance of the core reinforced concrete layer can be improved; assuming that the total axial pressure bearable by CTRC-steel pipe semi-assembled RC column is F T, the calculation formula of F T is as follows:
FT＝Fc+Fe
Wherein:
Fc＝fcAc+fyAs
Fe＝(σr+σsv)Ac
Wherein F c is the axial bearing capacity provided by the core reinforced concrete layer;
f e is the additional axial pressure bearing capacity provided by the inner steel pipe, the TRC shell and the connecting steel bar constraint core reinforced concrete layer;
f c is the axial compression strength of the core reinforced concrete layer;
a c is the effective cross-sectional area of the core concrete column;
f y is the yield strength of the longitudinal rebar;
a s is the total cross-sectional area of the longitudinal rebar;
sigma r is the radial compressive stress to which the inner steel tube and the TRC shell restrict the core concrete column;
σ sv is the radial compressive stress to which the connecting steel bars constraint the core concrete column;
n is the number of layers or turns of the carbon fiber woven mesh in the TRC shell;
f f is the ultimate tensile strength of the fibers in the carbon fiber woven mesh;
a f is the cross-sectional area of single Shu Wei fiber in the carbon fiber woven mesh;
f a is the yield strength of the inner steel pipe;
s 1 is the grid spacing of the carbon fiber woven mesh;
d a is the wall thickness of the inner steel pipe;
d 1 is the distance between the inner steel pipe and the TRC casing;
a is the number of turns of the connecting steel bars arranged on the periphery of one inner layer steel pipe section;
n is the number of the connecting reinforcements included in a circle of connecting reinforcements;
f yv is the yield strength of the tie bar;
a yv is the cross-sectional area of the tie bar;
d 2 is the inner diameter of the TRC housing;
s 2 is the vertical height of one inner steel pipe segment.
7. The marine environment-oriented CTRC-steel pipe semi-fabricated RC column of claim 1, wherein: the external power supply is a solar external power supply facility.
8. A preparation method of CTRC-steel pipe semi-assembled RC column facing marine environment is characterized by comprising the following steps: the method comprises the following steps:
Step 1, prefabricating an inner layer steel pipe assembly: preparing a plurality of inner layer steel pipe sections; arranging a circle of connecting steel bars on the periphery of each inner layer steel pipe section; each circle of connecting steel bars comprises N connecting steel bars which are uniformly distributed along the circumferential direction; each connecting steel bar is provided with b longitudinal steel bar trepanning holes; wherein a is more than or equal to 1; n is more than or equal to 2; b is more than or equal to 1;
When a is more than or equal to 2, circumferentially staggering two adjacent circles of linking reinforcing steel bars;
Forming a multiplied by N multiplied by b longitudinal steel bar trepanning on the same cross section;
Step 2, prefabricating a TRC shell: preparing a TRC shell comprising n layers of carbon fiber woven meshes, wherein each layer of carbon fiber woven mesh is provided with an external lead;
Step 3, positioning the longitudinal steel bars: uniformly arranging the a multiplied by N multiplied by b longitudinal steel bars in N circles along the circumferential direction, wherein the positions of the longitudinal steel bar sleeve holes are in one-to-one correspondence with the a multiplied by N multiplied by b longitudinal steel bars;
and 4, splicing the inner steel pipe, which specifically comprises the following steps:
Step 4-1, hoisting: hoisting the prefabricated inner layer steel pipe assembly in the step 1 to the position right above the positioned longitudinal steel bars, and enabling the a multiplied by N multiplied by b longitudinal steel bar trepanning of the inner layer steel pipe assembly to be located right above the corresponding longitudinal steel bars;
Step 4-2, sleeving longitudinal steel bars: the height of the inner layer steel pipe assembly is reduced, so that the a multiplied by N multiplied by b longitudinal steel bar trepanning of the inner layer steel pipe assembly is sleeved on the periphery of the corresponding longitudinal steel bar; the height of the inner layer steel pipe assembly is continuously lowered to the bottommost part;
Step 4-3, splicing: repeating the steps 4-1 to 4-2 until all the set inner layer steel pipe assemblies are sleeved; at this time, all inner layer steel pipe assemblies are stacked up and down to form an assembled inner steel pipe; the inner steel pipe and the longitudinal steel bars are formed into a steel skeleton together;
step 5, mounting a TRC shell: hoisting the TRC shell prefabricated in the step 2 to the position right above the assembled inner steel pipe in the step 4, and then lowering the height of the TRC shell to the bottommost part, and coaxially sleeving the TRC shell on the periphery of the longitudinal steel bar of the outermost ring;
And step 6, pouring: pouring core concrete between the inner steel pipe and the TRC shell and curing, so as to form a double-wall constraint column;
Step 7, electrifying: the negative electrode of the external power supply is connected with the longitudinal steel bars in an energized mode, and the positive electrode of the external power supply is connected with external wires of the n layers of carbon fiber woven meshes in an energized mode, so that an external current cathode protection circuit ICCP is formed; wherein, n layers of carbon fiber woven mesh are used as auxiliary anodes of an impressed current cathodic protection circuit ICCP; the external power supply continuously transmits electrons to the inner steel pipe through the longitudinal steel bars and the connecting steel bars, so that on one hand, the electrons loss of the steel skeleton can be inhibited, and further the corrosion of the steel skeleton by seawater is inhibited; on the other hand, chloride ions in the seawater migrate to the auxiliary anode, and a chlorine evolution reaction occurs at the auxiliary anode, so that the content of chloride ions penetrating into the core reinforced concrete layer and the steel skeleton is reduced.
9. The marine environment-oriented CTRC-steel pipe semi-assembled RC column preparation method of claim 8, wherein the method comprises the following steps: in step 1, a=2; n=3; b=2; at the same cross section, 12 longitudinal rebar trepanning will be formed.
10. The marine environment-oriented CTRC-steel pipe semi-assembled RC column preparation method of claim 8, wherein the method comprises the following steps: in step 2, the preparation method of the TRC shell comprises the following steps:
Step 2-1, paving a plastic film: selecting a PVC pipe with a set size specification, paving a layer of plastic film on the PVC pipe, and uniformly coating an interface adhesive on the plastic film;
Step 2-2, preparing a carbon fiber woven mesh: coating conductive silver paste on the connection part of the wires of the carbon fiber woven net, then clamping and firmly adhering the conductive silver paste by using a copper foil, and finally welding the wires on the copper foil by using a tin soldering method, thereby manufacturing the carbon fiber woven net with the wires; step 2-3, coating fine aggregate concrete: coating a layer of fine aggregate concrete on the plastic film to form a first layer of fine aggregate concrete;
step 2-4, paving a carbon fiber woven net: paving a layer of carbon fiber woven mesh prepared in the step 2-2 on the outer side of the first layer of fine aggregate concrete;
step 2-5, repeating the steps 2-3 to 2-4, finishing the laying of the n layers of carbon fiber woven meshes until the design thickness is reached, and curing;
Step 2-6, forming a TRC shell: and after curing is completed, removing the internal PVC pipe and the plastic film to form the TRC shell.
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