CN114622685B - Prefabricated UHPC-steel-UHPC pipe concrete composite column and construction method thereof - Google Patents
Prefabricated UHPC-steel-UHPC pipe concrete composite column and construction method thereof Download PDFInfo
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- CN114622685B CN114622685B CN202210211275.4A CN202210211275A CN114622685B CN 114622685 B CN114622685 B CN 114622685B CN 202210211275 A CN202210211275 A CN 202210211275A CN 114622685 B CN114622685 B CN 114622685B
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- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 145
- 239000004567 concrete Substances 0.000 title claims abstract description 77
- 239000002131 composite material Substances 0.000 title claims abstract description 25
- 238000010276 construction Methods 0.000 title claims abstract description 25
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 148
- 239000010959 steel Substances 0.000 claims abstract description 148
- 230000000712 assembly Effects 0.000 claims abstract description 16
- 238000000429 assembly Methods 0.000 claims abstract description 16
- 239000010410 layer Substances 0.000 claims description 27
- 239000011241 protective layer Substances 0.000 claims description 18
- 238000003466 welding Methods 0.000 claims description 7
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 2
- 230000008901 benefit Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 239000004568 cement Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 210000001503 joint Anatomy 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000009991 scouring Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 108010053481 Antifreeze Proteins Proteins 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 230000002528 anti-freeze Effects 0.000 description 1
- 230000003487 anti-permeability effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011372 high-strength concrete Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/36—Columns; Pillars; Struts of materials not covered by groups E04C3/32 or E04C3/34; of a combination of two or more materials
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/58—Connections for building structures in general of bar-shaped building elements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Rod-Shaped Construction Members (AREA)
Abstract
The invention relates to a prefabricated UHPC-steel-UHPC pipe concrete composite column and a construction method thereof, comprising prefabricated UHPC-steel-UHPC pipe sections, UHPC post-pouring joints and core cast-in-place concrete, wherein the prefabricated UHPC-steel-UHPC pipe sections are coaxially filled with core cast-in-place concrete, bolt fixing assemblies are pre-embedded at the upper end and the lower end of the prefabricated UHPC-steel-UHPC pipe sections, the upper and the lower adjacent prefabricated UHPC-steel-UHPC pipe sections are fixed through the bolt fixing assemblies and connecting steel plates, the connecting steel plates are fixedly connected with the upper and the lower adjacent UHPC-steel-UHPC pipe sections through the UHPC post-pouring joints, a plurality of stirrups are welded on the outer walls of the steel pipes, a plurality of short longitudinal ribs are welded and fixed on the inner walls, and a plurality of bolt fixing assemblies are pre-embedded at the end parts. The rapid assembly and positioning of the prefabricated UHPC-steel-UHPC pipe sections are realized through the concave mortise and tenon respectively arranged at the upper end part and the lower end part of the UHPC hoop layer. The prefabricated UHPC-steel-UHPC pipe concrete composite column has high bearing capacity, good adhesion performance of new and old interfaces and remarkable durability, and can effectively reduce the cross section size of the structure, prolong the service life of the structure and reduce the construction cost.
Description
Technical Field
The invention relates to the technical field of various engineering applying prefabricated pipe concrete columns, in particular to a prefabricated UHPC-steel-UHPC pipe concrete combined column and a construction method thereof.
Background
The prefabricated pipe concrete column is generally composed of an outer-layer high-strength concrete prefabricated pipe and core cast-in-place concrete, the prefabricated pipe is produced in a factory in a large scale, the quality is controllable, the splicing of prefabricated components is mainly completed on a construction site, no template is built and removed, the prefabricated pipe concrete column is a semi-assembled component meeting the rapid construction requirement, and the prefabricated pipe concrete column has remarkable economic and social benefits and good application prospect.
The prefabricated pipe serves as a pouring template of core concrete and is an important bearing component, and the mechanical property of the prefabricated pipe concrete column is greatly influenced. With the continuous improvement of the material preparation technology, the performance of core cast-in-place concrete is continuously improved, and the performance requirement of a prefabricated pipe is also improved in a matched manner. At present, the prefabricated pipe has the defects of obvious brittleness, poor durability and poor crack resistance, and the invention of the prefabricated pipe with higher performance is urgently needed.
The ultra-high performance concrete (ultra high performance concrete, UHPC for short) is a novel cement-based material with ultra-high strength, high durability and high toughness by optimizing aggregate grading and adopting fiber reinforcement, toughening and crack resistance, and is of great interest in building and bridge reinforcement engineering. However, UHPC has severe preparation and maintenance conditions, so that the quality of the UHPC is difficult to ensure on a construction site, and the large-scale popularization and application of the UHPC are hindered.
The steel pipe concrete composite material fully utilizes the mechanical properties of steel and concrete through the close-fitting support of the hoops of the steel pipes and the concrete, has the advantages of high bearing capacity, good earthquake resistance, good fire resistance and the like, and is widely applied to industrial plants, high-rise buildings and bridge engineering.
The method comprehensively utilizes the respective performance advantages of the UHPC and the concrete-filled steel tube, simultaneously gives consideration to the defect of uncontrollable quality existing in the UHPC construction site preparation, and provides a prefabricated UHPC-steel-UHPC tube concrete composite column so as to solve the problem that the prefabricated tube concrete is not high enough in performance.
Disclosure of Invention
In view of the defects of the prior art, the technical problem to be solved by the invention is to provide the prefabricated UHPC-steel-UHPC pipe concrete composite column and the construction method thereof, which have the advantages of reasonable structure, high bearing capacity and prolonged service life.
In order to solve the technical problems, the technical scheme of the invention is as follows: the utility model provides a prefabricated UHPC-steel-UHPC pipe concrete composite column, includes prefabricated UHPC-steel-UHPC pipe section, UHPC post-cast joint and core cast-in-place concrete, coaxial filling is equipped with core cast-in-place concrete in the prefabricated UHPC-steel-UHPC pipe section, and prefabricated UHPC-steel-UHPC pipe section upper and lower tip has all been pre-buried bolt fastening assembly to the upper and lower adjacent prefabricated UHPC-steel-UHPC pipe section is fixed with the connection steel sheet through bolt fastening assembly, the connection steel sheet is outside to be filled with the UHPC-steel-UHPC pipe section that is adjacent from top to bottom through UHPC post-cast joint and links firmly, through a plurality of connection steel sheets with UHPC post-cast joint realizes vertical concatenation fixedly and extension.
Furthermore, the prefabricated UHPC-steel-UHPC pipe segment is a permanent column template of the core cast-in-place concrete, and the working performance of the core cast-in-place concrete meets the requirements of construction pouring and structural design.
Further, the prefabricated UHPC-steel-UHPC pipe section comprises a steel pipe, and a UHPC hoop layer and a UHPC protective layer which are respectively fixedly arranged on the inner end face and the outer end face of the steel pipe.
Further, the UHPC hoop layer is positioned between the steel pipe and the core cast-in-place concrete, the upper end part and the lower end part of the UHPC hoop layer are respectively provided with a concave mortise and a tenon so as to facilitate the splicing and the limiting of the upper and lower adjacent prefabricated UHPC-steel-UHPC pipe sections, the shape and the size of the concave mortise and the tenon are matched with the rapid splicing and positioning requirements of the upper and lower adjacent prefabricated UHPC-steel-UHPC pipe sections, and the material strength and the thickness of the UHPC hoop layer are matched with the performance requirements of the core cast-in-place concrete; the UHPC protective layer is cast on the periphery of the steel pipe in a tubular shape and is fixedly connected into a whole, and the thickness of the UHPC protective layer is matched with the substance exchange which effectively isolates the steel pipe from the external environment.
Further, a plurality of stirrups are uniformly distributed on the periphery of the steel pipe at intervals along the length direction of the steel pipe, the stirrups are uniformly sleeved on the outer surface of the steel pipe and welded on the outer surface of the steel pipe, and the diameters and the intervals of the stirrups are matched with the interface performance of the steel pipe and the UHPC protective layer, so that the efficiency of the hoops of the steel pipe is improved, and the interface performance of the steel pipe and the UHPC protective layer is improved.
Further, a plurality of short longitudinal rib groups are uniformly distributed on the inner surface of the steel pipe along the length direction at intervals, each short longitudinal rib group comprises a plurality of short longitudinal ribs which are symmetrically welded on the inner wall of the steel pipe along the center of the center axis of the steel pipe, and the arrangement parameters of the plurality of short longitudinal ribs on the inner wall of the steel pipe are matched with the interface performance of the improved steel pipe and the UHPC hoop layer.
Further, the bolt fixing assembly comprises threaded steel bars, gaskets and nuts, the upper end and the lower end of the steel pipe are respectively provided with reserved holes through which the inner pipe penetrates along the periphery of the steel pipe at intervals, the threaded steel bars are radially penetrated into the reserved holes, the threaded steel bars positioned in the steel pipe are pre-tightened with the nuts through the gaskets, the threaded steel bars positioned outside the steel pipe are tightly fastened with the nuts through the gaskets after being covered by the connecting steel plates, and the diameter and the arrangement parameters of the bolt fixing assembly are matched with the splicing performance requirements of the prefabricated UHPC-steel-UHPC pipe sections.
Further, the connecting steel plates are arc-shaped and cover the butt joint positions of the upper and lower adjacent steel pipes, namely, the inner contours of the connecting steel plates are attached to the outer contours of the upper and lower adjacent steel pipes, and a plurality of connecting steel plates are arranged along the periphery of the steel pipes so as to be convenient for fastening the upper and lower adjacent steel pipes.
Furthermore, the inner layer of the UHPC cuff layer is zigzag-like along the length direction of the inner layer so as to be bonded with core cast-in-place concrete.
Further, hole groups for the threaded steel bars to radially penetrate out are formed in the connecting steel plates, the number and the arrangement mode of the hole groups are consistent with those of the bolt fixing assemblies, and the diameter of the hole groups is slightly larger than that of the threaded steel bars of the bolt fixing assemblies.
Further, the rapid splicing and fixing of the upper and lower adjacent prefabricated UHPC-steel-UHPC pipe sections is realized by adopting a plurality of connecting steel plates and bolt fixing assemblies, screw reinforcing steel bars of the bolt fixing assemblies penetrate through hole groups of the connecting steel plates one by one, and gaskets and nuts of the bolt fixing assemblies are screwed one by one.
Further, after the upper and lower adjacent prefabricated UHPC-steel-UHPC pipe sections are spliced and fixed, a gap for placing a connecting steel plate is arranged between the upper and lower adjacent UHPC protective layers, and a layer of UHPC post-pouring seam is wrapped at the gap to ensure the splicing durability of the upper and lower adjacent prefabricated UHPC-steel-UHPC pipe sections.
The construction method of the prefabricated UHPC-steel-UHPC pipe concrete composite column comprises the following steps: step S1: firstly, preparing a steel pipe, and spot-welding stirrups on the periphery of the steel pipe; step S2: welding a short longitudinal rib group on the inner periphery of the steel pipe, and forming reserved holes for bolts to pass through at the upper end and the lower end of the steel pipe; step S3: installing a bolt fixing assembly at the reserved hole, and screwing a nut; step S4: pouring an UHPC protective layer and an UHPC cuff layer; step S5: removing a gasket and a nut of the bolt fixing assembly on the outer side of the steel pipe; step S6: splicing and positioning the upper and lower adjacent prefabricated UHPC-steel-UHPC pipe sections, butting the tenons with the concave mortise of the adjacent prefabricated UHPC-steel-UHPC pipe sections, and installing a connecting steel plate at the butting position; step S7: resetting the dismantled gasket and the nut, and fastening and connecting the steel plate; step S8: pouring a UHPC wet joint; step S9: pouring core cast-in-place concrete to finish assembly.
Compared with the prior art, the invention has the following beneficial effects: the prefabricated UHPC-steel-UHPC pipe concrete composite column is a semi-assembled high-performance steel pipe concrete composite column, has the advantages of high bearing capacity, high durability, strong bonding between new and old interfaces, high anti-seismic performance and high construction efficiency, and comprises the following concrete contents:
(1) The UHPC has remarkable compression resistance, can remarkably improve the bearing capacity of the prefabricated UHPC-steel-UHPC pipe concrete composite column, and has great significance in reducing the cross section size and the dead weight of the structure.
(2) The UHPC-steel-UHPC pipe is a prefabricated pipe fitting, has stable performance and controllable quality, can provide a pouring template for core cast-in-place concrete, omits the work of building and dismantling the column template, and has low construction cost and simpler and more convenient construction;
(3) The prefabricated UHPC-steel-UHPC pipe is externally covered with a UHPC protective layer, and the UHPC has compact internal structure and strong anti-cracking, anti-permeability and anti-scouring capabilities, so that the substance exchange between the steel pipe and the external environment can be effectively prevented, the prefabricated UHPC-steel-UHPC pipe has an important effect on preventing corrosion or external collision damage of the steel pipe, and the prefabricated UHPC-steel-UHPC pipe concrete composite column has remarkable durability.
(4) The prefabricated UHPC-steel-UHPC pipe adopts a steel pipe as a stiffness framework of the prefabricated pipe, replaces steel bar binding of the prefabricated pipe, is beneficial to obviously improving the pressed ductility of the prefabricated pipe and the hoop effect of the prefabricated pipe on core cast-in-place concrete, and enables the prefabricated UHPC-steel-UHPC pipe combined column to show good anti-seismic performance;
(5) A zigzag UHPC cuff layer is attached in the prefabricated UHPC-steel-UHPC pipe, so that the interface bonding performance of new and old concrete can be effectively improved, and the overall performance of the prefabricated UHPC-steel-UHPC pipe concrete combined column is better; meanwhile, the UHPC is used for smaller transverse deformation coefficient than the core concrete, the core concrete is under the double hooping effect of the steel pipe and the UHPC, and the ultimate strength and the plastic deformation capability of the core concrete are improved;
(6) The concave mortise and tenon are arranged on the UHPC hoop layer of the prefabricated UHPC-steel-UHPC pipe, so that the assembly and positioning of the upper and lower adjacent prefabricated UHPC-steel-UHPC pipe sections can be realized rapidly, the construction rate is accelerated, and the construction period is shortened.
(7) The upper and lower adjacent prefabricated UHPC-steel-UHPC pipe segments are spliced by adopting a bolt fixing assembly and a connecting steel plate, and meanwhile, the UHPC wet joint protection is matched, so that the splicing rate is high and the splicing node performance is reliable.
The invention will be described in further detail with reference to the drawings and the detailed description.
Drawings
FIG. 1 is a schematic view of a construction of an embodiment of the present invention;
FIG. 2 is a schematic view of the female mortise position of the cross-sectional view of A-A in FIG. 1;
FIG. 3 is a schematic illustration of the construction of a prefabricated UHPC-steel-UHPC pipe segment in an embodiment of the present invention;
FIG. 4 is a cross-sectional view of B-B in FIG. 3;
FIG. 5 is a schematic view of the structure of a steel pipe according to an embodiment of the present invention;
FIG. 6 is a cross-sectional view of C-C of FIG. 5;
FIG. 7 is a top view of a joined steel sheet according to an embodiment of the present invention;
FIG. 8 is a front view of a connecting steel plate according to an embodiment of the present invention;
FIG. 9 is a schematic view of the structure of the steel pipe in step 1 of the embodiment of the present invention;
FIG. 10 is a schematic view illustrating the installation of stirrups in step 1 of the present embodiment;
FIG. 11 is a schematic diagram illustrating the state of step 2 according to the embodiment of the present invention;
FIG. 12 is a schematic diagram illustrating the state of step 3 according to the embodiment of the present invention;
FIG. 13 is a schematic diagram showing the state of step 4 according to the embodiment of the present invention;
FIG. 14 is a schematic diagram showing the state of step 5 according to the embodiment of the present invention;
FIG. 15 is a schematic diagram illustrating the state of step 6 according to the embodiment of the present invention;
FIG. 16 is a schematic diagram showing the state of step 7 according to the embodiment of the present invention;
FIG. 17 is a schematic diagram illustrating the state of step 8 according to the embodiment of the present invention;
fig. 18 is a schematic diagram illustrating a state of step 9 according to the embodiment of the present invention.
In the figure: 1-core cast-in-place concrete; 2-UHPC post-pouring wet joint; 3-connecting steel plates; 4, a steel pipe; 5-UHPC protective layer; 6-UHPC cuff layer; 7, hooping; 8-short longitudinal ribs; 9-a screw thread reinforcing steel bar; 10-a gasket; 11-a nut; 12-tenons and 13-concave mortise and tenon joints; 14-prefabrication of UHPC-steel-UHPC pipe segments, 15-hole group.
Detailed Description
In order to make the above features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1-18, a prefabricated UHPC-steel-UHPC tube concrete composite column, comprises prefabricated UHPC-steel-UHPC tube segments 14, a UHPC post-cast-in-place joint 2, core cast-in-place concrete 1 and a connecting steel plate 3.
Specifically, the prefabricated UHPC-steel-UHPC pipe segment is prefabricated at the factory, comprising a steel pipe 4, a UHPC protective layer 5 and a UHPC ferrule layer 6.
In the embodiment of the invention, the prefabricated UHPC-steel-UHPC pipe segment is a permanent column template of the core cast-in-place concrete, and the working performance of the core cast-in-place concrete meets the requirements of construction pouring and structural design.
In the embodiment of the invention, the steel pipe 4 provides a hoop function for the concrete in the pipe for prefabricating the stiff framework of the pipe, and is the key for realizing good shock resistance and ductility of the prefabricated UHPC-steel-UHPC pipe concrete composite column. The outer wall and the inner wall of the steel pipe 4 are respectively attached with a plurality of stirrups 7 and a plurality of short longitudinal ribs 8, and a plurality of bolt fixing assemblies are pre-embedded at the upper end part and the lower end part. The stirrups 7 are welded on the outer wall of the steel pipe 4 in a spot mode at certain intervals along the axial direction, and the short longitudinal ribs 8 are welded and fixed on the inner wall of the steel pipe 4 in a certain interval along the axial direction and the circumferential direction. The stirrup 7 is used for enhancing the interface performance of the UHPC protective layer 5 and the outer wall of the steel pipe 4, and improving the hooping effect of the steel pipe 4 on the filled concrete; the short longitudinal ribs 8 are used for enhancing the interface performance of the UHPC hoop layer 6 and the inner wall of the hollow steel pipe 4. Among the several bolt-up components that are pre-buried, a single bolt-up component includes a rebar 9, 2 shims 10, and 2 nuts 11. The steel pipe 4 is provided with holes at certain intervals along the axial direction and the circumferential direction at the end part, the diameter of the twisted steel 9 is slightly smaller than that of the reserved holes, and the gasket 10 and the nut 11 are matched with the twisted steel 9. When a plurality of bolt fixing assemblies are pre-buried and positioned, the threaded steel bars 9 penetrate through holes reserved at the end parts of the steel pipes 4 one by one and protrude out of two sides of the steel pipes 4 by a certain height according to requirements, 1 gasket 10 and 1 nut 11 are respectively penetrated through two sides of the steel pipes 4, and the threaded steel bars 9 are fixed by screwing the nuts 11 on the two sides of the steel pipes 4.
In the embodiment of the invention, the UHPC protective layer 5 on the outer wall of the steel pipe aims at preventing the steel pipe from being corroded; the UHPC hoop layer 6 on the inner wall of the steel pipe aims to improve the combination effect of the steel pipe on the core concrete by utilizing the transverse deformation coefficient difference of the core concrete with different strengths, optimize the concrete filling material in the pipe, adopt a zigzag-like inner interface in the UHPC hoop layer, and have a positioning tenon 12 at the end part, and be matched with the tenon of the upper prefabricated UHPC-steel-UHPC pipe section through the concave mortise 13 at the top end, so that the interface bonding performance of new and old concrete can be improved, and the rapid assembly and positioning of the prefabricated UHPC-steel-UHPC pipe section can be realized.
In the embodiment of the invention, the rapid splicing and fixing of the upper and lower adjacent prefabricated UHPC-steel-UHPC pipe sections is realized by adopting a plurality of longitudinal connecting steel plates 3 matched with a plurality of bolt fixing components, and the splicing mode omits the welding work of butt joint of the steel pipes and has high construction rate. The inner wall of the longitudinal connecting steel plate 3 is attached to the outer wall of the steel pipe 4, and the inner circumference of the longitudinal connecting steel plate 3 can be 1/4 of the outer circumference of the steel pipe 4. The longitudinal connecting steel plate 3 is provided with hole groups 15 in a reserved mode at certain intervals along the axial direction and the circumferential direction, the number and the arrangement mode of the hole groups are consistent with those of a plurality of bolt fixing assemblies reserved at the end part of the steel pipe 4, and the diameter of the reserved holes is slightly larger than that of the deformed steel bars 9. When the prefabricated UHPC-steel-UHPC pipe sections are assembled and fixed, firstly, the gaskets 10 and the nuts 11 of the bolt fixing assemblies on the outer sides of the steel pipes 4 are removed, then the threaded reinforcing steel bars 9 of the bolt fixing assemblies penetrate through a plurality of hole groups of the longitudinal connecting steel plates one by one, and the longitudinal connecting steel plates 3 are fixed by screwing the removed gaskets 10 and the nuts 11 back again.
In the embodiment of the invention, core cast-in-place concrete 3 is poured into the prefabricated UHPC-steel-UHPC pipe, so that the prefabricated UHPC-steel-UHPC pipe concrete composite column is formed. The prefabricated UHPC-steel-UHPC pipe segment is used as a permanent column template of the core cast-in-place concrete 3, and the advantages of the building and dismantling work of the traditional prefabricated pipe concrete column non-column template are inherited. The working performance and the mechanical performance of the core cast-in-place concrete 3 are respectively matched with the construction requirement and the structural design requirement, and the core cast-in-place concrete has high fluidity and pumpability.
In the embodiment of the invention, the diameters of the deformed bars 9 in the pre-buried bolt fixing assemblies at the upper end part and the lower end part of the prefabricated UHPC-steel-UHPC pipe segment, the heights of the deformed bars 9 protruding out of the two sides of the steel pipe 4 and the reserved hole spacing of the steel pipe 4 are matched with the splicing requirements of the prefabricated UHPC-steel-UHPC pipe segment.
The UHPC provided by the embodiment has the compressive strength of more than 150MPa, the composition materials mainly comprise cement, a high-efficiency water reducing agent, fine sand with good grading, ground quartz sand powder, silica fume and other mineral admixtures, and the micro steel fiber is doped for reinforcement, toughening and crack resistance, so that the UHPC has good self-compaction property, is an ultrahigh-performance cement-based material with high strength, high toughness and low porosity, and has strong anti-seepage, crack resistance, anti-scouring, anti-corrosion and anti-freeze thawing capabilities. The UHPC protective layer 4 on the outer side of the steel pipe has the advantage of good durability, can be used as the protective layer of the prefabricated UHPC-steel-UHPC pipe concrete composite column, can effectively prolong the service life of the structure, and has remarkable economic and social benefits from the viewpoint of the cost of the whole life cycle. The UHPC hoop layer 5 on the inner side of the steel pipe utilizes the advantage of ultrahigh compressive strength, and has important effects of reducing the cross section of the member, reducing the dead weight of the structure and optimizing the steel-concrete combined effect.
The construction method of the prefabricated UHPC-steel-UHPC pipe concrete composite column comprises the following steps: step S1: firstly, preparing a steel pipe, and spot-welding stirrups on the periphery of the steel pipe; step S2: welding a short longitudinal rib group on the inner periphery of the steel pipe, and forming reserved holes for bolts to pass through at the upper end and the lower end of the steel pipe; step S3: installing a bolt fixing assembly at the reserved hole, and screwing a nut; step S4: pouring an UHPC protective layer and an UHPC cuff layer; step S5: removing a gasket and a nut of the bolt fixing assembly on the outer side of the steel pipe; step S6: splicing and positioning the upper and lower adjacent prefabricated UHPC-steel-UHPC pipe sections, butting the tenons with the concave mortise of the adjacent prefabricated UHPC-steel-UHPC pipe sections, and installing a connecting steel plate at the butting position; step S7: resetting the dismantled gasket and the nut, and fastening and connecting the steel plate; step S8: pouring a UHPC wet joint; step S9: pouring core cast-in-place concrete to finish assembly.
The invention is not limited to the above-mentioned best mode, any person can obtain other various forms of prefabricated UHPC-steel-UHPC pipe concrete composite columns and construction methods thereof under the teaching of the invention. All equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the present invention.
Claims (4)
1. A prefabricated UHPC-steel-UHPC tube concrete composite column, characterized in that: the method comprises the steps of prefabricating UHPC-steel-UHPC pipe sections, UHPC post-pouring wet joints and core cast-in-place concrete, wherein the core cast-in-place concrete is coaxially filled in the prefabricating UHPC-steel-UHPC pipe sections, bolt fixing assemblies are pre-embedded at the upper end parts and the lower end parts of the prefabricating UHPC-steel-UHPC pipe sections, the upper and lower adjacent prefabricating UHPC-steel-UHPC pipe sections are fixed through the bolt fixing assemblies and connecting steel plates, and the connecting steel plates are filled with the UHPC post-pouring wet joints outside the connecting steel plates so as to be fixedly connected with the upper and lower adjacent UHPC-steel-UHPC pipe sections;
the prefabricated UHPC-steel-UHPC pipe section comprises a steel pipe, and an UHPC hoop layer and an UHPC protective layer which are respectively and fixedly arranged on the inner end face and the outer end face of the steel pipe;
the UHPC hoop layer is positioned between the steel pipe and the core cast-in-place concrete, and the upper end part and the lower end part of the UHPC hoop layer are respectively provided with a concave mortise and a convex tenon so as to facilitate splicing and splicing limiting of the upper and lower adjacent prefabricated UHPC-steel-UHPC pipe sections; the UHPC protective layer is cast on the periphery of the steel pipe in a tubular shape and is fixedly connected into a whole;
a plurality of stirrups are uniformly distributed on the periphery of the steel pipe at intervals along the length direction of the steel pipe, and the stirrups are uniformly sleeved with the hoop and welded on the outer surface of the steel pipe;
a plurality of short longitudinal rib groups are uniformly distributed on the inner surface of the steel pipe along the length direction at intervals, and each short longitudinal rib group comprises a plurality of short longitudinal ribs which are symmetrically welded on the inner wall of the steel pipe along the center of the center shaft of the steel pipe;
the connecting steel plates are arc-shaped and are covered at the joint of the upper adjacent steel pipes and the lower adjacent steel pipes, and a plurality of connecting steel plates are arranged along the periphery of the steel pipes so as to be convenient for fastening the upper adjacent steel pipes and the lower adjacent steel pipes;
the inner layer of the UHPC cuff layer is zigzag-like along the length direction of the inner layer so as to be bonded with core cast-in-place concrete.
2. A prefabricated UHPC-steel-UHPC tube concrete composite column according to claim 1, wherein: the bolt fixing assembly comprises screw bars, gaskets and nuts, the upper end and the lower end of the steel pipe are respectively provided with reserved holes through which the inner pipe penetrates along the periphery of the steel pipe at intervals, the screw bars radially penetrate into the reserved holes, the screw bars positioned in the steel pipe are pre-tightened through the gaskets and the nuts, and the screw bars positioned outside the steel pipe are tightly fastened through the gaskets and the nuts after being covered by the connecting steel plates.
3. A prefabricated UHPC-steel-UHPC tube concrete composite column according to claim 2, characterized in that: and the connecting steel plate is provided with hole groups for the threaded reinforcing steel bars to radially penetrate out.
4. A construction method for prefabricating a UHPC-steel-UHPC pipe concrete composite column, which is characterized in that the prefabricating UHPC-steel-UHPC pipe concrete composite column according to any one of claims 1-3 is adopted, and the steps are carried out as follows: step S1: firstly, preparing a steel pipe, and spot-welding stirrups on the periphery of the steel pipe; step S2: welding a short longitudinal rib group on the inner periphery of the steel pipe, and forming reserved holes for bolts to pass through at the upper end and the lower end of the steel pipe; step S3: installing a bolt fixing assembly at the reserved hole, and screwing a nut; step S4: pouring an UHPC protective layer and an UHPC cuff layer; step S5: removing a gasket and a nut of the bolt fixing assembly on the outer side of the steel pipe; step S6: splicing and positioning the upper and lower adjacent prefabricated UHPC-steel-UHPC pipe sections, butting the tenons with the concave mortise of the adjacent prefabricated UHPC-steel-UHPC pipe sections, and installing a connecting steel plate at the butting position; step S7: resetting the dismantled gasket and the nut, and fastening and connecting the steel plate; step S8: pouring UHPC post-pouring wet joints; step S9: pouring core cast-in-place concrete to finish assembly.
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