CN118207799A - Continuous combined template of interface structural steel fibers and construction method - Google Patents
Continuous combined template of interface structural steel fibers and construction method Download PDFInfo
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- CN118207799A CN118207799A CN202410321674.5A CN202410321674A CN118207799A CN 118207799 A CN118207799 A CN 118207799A CN 202410321674 A CN202410321674 A CN 202410321674A CN 118207799 A CN118207799 A CN 118207799A
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- 239000000835 fiber Substances 0.000 title claims abstract description 145
- 238000010276 construction Methods 0.000 title claims abstract description 27
- 229910000746 Structural steel Inorganic materials 0.000 title claims abstract description 9
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 135
- 239000010959 steel Substances 0.000 claims abstract description 135
- 239000011374 ultra-high-performance concrete Substances 0.000 claims abstract description 105
- 238000000034 method Methods 0.000 claims abstract description 22
- 238000009415 formwork Methods 0.000 claims description 12
- 239000002131 composite material Substances 0.000 claims description 9
- 238000012423 maintenance Methods 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 7
- 238000005266 casting Methods 0.000 abstract description 3
- 238000004080 punching Methods 0.000 description 11
- 239000004567 concrete Substances 0.000 description 10
- 239000006260 foam Substances 0.000 description 10
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 6
- 239000002002 slurry Substances 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000000741 silica gel Substances 0.000 description 4
- 229910002027 silica gel Inorganic materials 0.000 description 4
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000013013 elastic material Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000002040 relaxant effect Effects 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003079 width control Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
- E04B5/32—Floor structures wholly cast in situ with or without form units or reinforcements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
- E04C5/012—Discrete reinforcing elements, e.g. fibres
-
- 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
- E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
- E04G11/36—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings
- E04G11/365—Stop-end shutterings
-
- 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
- E04G9/00—Forming or shuttering elements for general use
- E04G9/10—Forming or shuttering elements for general use with additional peculiarities such as surface shaping, insulating or heating, permeability to water or air
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention relates to the technical field of structural design and construction methods of joints of buildings, in particular to a continuous combined template of interface structural steel fibers and a construction method. A continuous combined template of interface structural steel fibers, wherein the combined template is positioned at an interface of the ultra-high performance concrete poured twice when in use; the combined template comprises an elastic strip and a hard sheet, wherein the elastic strip separates ultra-high performance concrete from the hard sheet, and a plurality of steel fibers are inserted into one side of the elastic strip, which is close to the first pouring area. Realizing connection of steel fibers to adjacent primary UHPC and secondary UHPC; the pre-tensioning-releasing operation applies three-way confining pressure to the pre-tensioned inserted steel fibers to better fix the steel fibers and prevent the steel fibers from shifting or falling off in the casting UUHPC process.
Description
Technical Field
The invention relates to the technical field of structural design and construction methods of joints of buildings, in particular to a continuous combined template of interface structural steel fibers and a construction method.
Background
In order to improve the construction efficiency, a shallow-buried steel wire mesh method is proposed by a learner, so that the exposure of the fibers can be realized, a certain interface roughness can be obtained, and further, the bonding strength of the interface is improved, but the length, the orientation and the distribution of the exposed steel fibers are uncontrollable, so that the randomness of the bonding strength and the crack width control capability of the interface is larger. In the prior art CN107060117a, fibers are partially penetrated into a connecting plate (such as foamed plastic) along the length direction, then a template is installed at a preset concrete joint interface, one side of the connecting plate, which is not exposed by the fibers, is tightly attached to the inner side of the template, the template and the connecting plate at the joint interface are removed after one-time concrete pouring and curing, the fibers penetrated into the connecting plate are exposed at the joint interface, and then the template is installed and the next-time concrete pouring and curing are performed, so that the fibers are connected to adjacent concrete in different batches. The rigidity of the foam board in the prior art is low, and effective supporting force is difficult to provide for a large-volume ultra-high performance concrete (UHPC) structure; secondly, the porosity of the raw material of the foam board is large, and the fixing effect on the inserted steel fibers is not ideal; in addition, if some steel fibers are obliquely penetrated into the foam board, the foam board is damaged during demolding, and the recycling of the foam board cannot be realized.
Disclosure of Invention
The invention aims to solve the problems that the foam board in the prior art has lower rigidity and is difficult to provide effective supporting force for a large-volume UHPC structure; secondly, the porosity of the raw material of the foam board is large, and the fixing effect on the inserted steel fibers is not ideal; in addition, if part of steel fibers are obliquely penetrated into the foam board, the foam board can be damaged when the mould is disassembled, and the problem that the foam board cannot be reused is solved; the combined template comprises an elastic strip and a hard sheet, wherein the elastic strip surrounds the hard sheet along the length direction of the hard sheet, the elastic strip separates ultra-high performance concrete from the hard sheet, and a plurality of steel fibers are inserted into one side of the elastic strip, which is close to the first pouring area. The combined template is adopted as a template for pouring UHPC, so that the steel fiber is connected with the adjacent primary UHPC and secondary UHPC; the elastic strip can apply three-way confining pressure to the steel fiber inserted after pretension by pretension-relaxation operation so as to better fix the steel fiber and prevent the steel fiber from shifting or falling off in the process of pouring UUHPC, and meanwhile, the elastic strip has better ductility, can facilitate punching and inserting the steel fiber and is used for filling a combined template to serve as a template gap for pouring UHPC, and UHPC slurry leakage during pouring is prevented; the hard thin plate is used as the framework of the combined template, so that the combined template can bear various loads in the construction process, the stability of the pouring template is ensured, and the strength is enough.
Preferably, fixing structures are arranged at two ends of the elastic strip, the elastic strip is fixed outside the hard sheet by adopting the fixing structures, the fixing structures are provided with at least two fixing points, each fixing point comprises a first fixing point and a second fixing point, and the stretching length of the elastic strip when the elastic strip is fixed by adopting the first fixing point is larger than that of the elastic strip when the elastic strip is fixed by adopting the first fixing point. The elastic strip is fixed by surrounding the hard sheet along the length direction by arranging the fixing structures at the two ends of the elastic strip, and the fixing structures are provided with a plurality of fixing points, so that the elastic strip can be conveniently pretensioned and loosened, and the elastic strip is still in a stretching state and is attached to the hard sheet when the elastic strip is pretensioned.
Preferably, the thickness of the elastic strip is equal to 1/2 of the length of the steel fibers. In order to ensure that the bonding performance of the new UHPC and the old UHPC is consistent with that of the steel fibers, the steel fibers with equal lengths are respectively embedded into the primary UHPC and the secondary UHPC, so that the bonding performance of the steel fibers-UHPC on both sides of the interface of the primary UHPC and the secondary UHPC is ensured.
Preferably, the thickness of the hard sheet is 1/2 to 1/3 of the thickness of the elastic strip. In order to ensure that the hard sheet can bear various loads in one UHPC pouring process and the hard sheet does not bend when being wound with the elastic strip, the hard sheet needs to reach 1/3 of the thickness of the elastic strip, and simultaneously, in order to avoid too heavy combined templates and reduce construction cost, the thickness of the hard sheet can be less than 1/2 of the thickness of the elastic strip.
Preferably, the elastic strip is provided with a plurality of through holes, and steel fibers are placed in the through holes. The distribution and the gesture of the steel fibers are manually controlled by punching through holes on the pre-tensioned elastic strips, and the seams of the primary UHPC and the secondary UHPC with different shapes and characteristics can be controlled.
Preferably, the angles of the through holes are randomly distributed, the number of the through holes is obtained according to the volume mixing amount of the steel fibers in the ultra-high performance concrete, and the volume mixing amount of the steel fibers in the ultra-high performance concrete is 1-3%.
Preferably, the combined template is used as a pouring template of the joint interface of the primary ultra-high-performance concrete; before the elastic strip is inserted into the steel fiber, the fixing structure of the elastic strip is fixed by adopting a first fixing point; after the elastic strip is inserted into the steel fiber, the fixing structure of the elastic strip is fixed by adopting a second fixing point. The elastic strip is fixed by a first fixed point to realize pretension operation, and is fixed by a second fixed point to realize relaxation operation, so that three-way confining pressure is applied to the steel fiber inserted after pretension, the steel fiber is well fixed, and the steel fiber is prevented from being displaced or falling off in the UHPC pouring process.
Preferably, after the fixing structure of the elastic strip is fixed by adopting the first fixing point, a through hole is punched on one side of the elastic strip, which is close to the first pouring area.
Preferably, the fixing structure of the elastic strip is installed by adopting a pouring template which is used as a joint interface of the primary ultra-high performance concrete after being fixed by a second fixing point. The elastic strip adopts the second fixed point to fix the steel fiber, prevents to pour UHPC in-process steel fiber and takes place displacement or drop, because expose the steel fiber of remaining 1/2 length on the elastic strip, the steel fiber can imbed in UHPC once.
Preferably, the combined template is used for removing the hard thin plate and the elastic strip after one ultra-high performance concrete pouring maintenance is completed. After the hard sheet and the elastic strip are removed, 1/2 steel fibers inserted into the elastic strip part are exposed at the joint of the primary UHPC and the secondary UHPC, and the secondary UHPC is poured, so that the steel fibers with equal length can be respectively embedded into the new UHPC and the old UHPC, and the uniform steel fiber-UHPC bonding performance at the two sides of the joint is ensured.
The invention solves the problems in the prior art and has the following beneficial effects that the elastic strip is made of elastic material, and the hard sheet is made of hard material. The elastic strip can apply three-way confining pressure to the inserted steel fiber through pre-tensioning-loosening operation so as to better fix the steel fiber and prevent the steel fiber from shifting or falling off in the UHPC pouring process; secondly, the UHPC has excellent fluidity, and the elastic strips can be used for filling the die plate joints to prevent the UHPC from leaking slurry; the elastic strip is soft and convenient to detach; the hard sheet has enough strength and rigidity, is mainly used for bearing various loads possibly occurring in the construction process, and ensures the stability of the pouring template.
Drawings
FIG. 1 is a schematic diagram of a construction of a UHPC poured once according to the present invention;
FIG. 2 is a schematic diagram of the structure of a cast secondary UHPC of the present invention;
FIG. 3 is a schematic view of a combined form of the present invention;
FIG. 4 is a schematic structural view of an elastic strip according to embodiment 1 of the present invention;
FIG. 5 is a schematic structural view of an elastic strip according to embodiment 2 of the present invention;
FIG. 6 is a schematic structural view of an elastic strip according to embodiment 3 of the present invention;
Fig. 7 is a schematic structural view of a hard sheet according to embodiment 3 of the present invention.
Legend description: primary UHPC1; a combined template 2; secondary UHPC3; a hard sheet 4; an elastic strip 5; steel fibers 6; a magic tape 7; a first fixed point 8; a second fixed point 9; an elastic ring 10; a fixing hole 11; and a fixing protrusion 12.
Detailed Description
For the purpose of embodiments of the present invention; the technical scheme and the advantages are more clear, and the technical scheme in the embodiment of the invention is clearly and completely described below with reference to the accompanying drawings in the embodiment of the invention.
Example 1
As shown in fig. 1 and 2, in this embodiment, a continuous composite form of steel fibers of an interface structure, where the interface structure includes a first ultra-high performance concrete poured for the first time and a second ultra-high performance concrete poured for the second time, where the composite form is located at an interface 2 of the ultra-high performance concrete poured for the second time when in use, where the composite form 2 is designed to enable continuous steel fibers 6 to be applied to a joint between a primary UHPC1 and a secondary UHPC3, and where the distribution of the steel fibers 6 can be specifically designed according to different performances required for the joint of each construction UHPC, so that the performance of the concrete joint is improved, and the performance of the concrete joint is more excellent in terms of bearing pressure and crack resistance; the length of the combined template 2 is equal to the length of the interface of the ultra-high performance concrete poured twice; the combined formwork 2 comprises an elastic strip 5 and a hard sheet 4, the elastic strip 5 surrounds the hard sheet 4 along the length direction of the hard sheet 4, the ultra-high performance concrete and the hard sheet 4 are separated, the hard formwork and the fixed steel fibers 6 are conveniently removed, the ultra-high performance concrete and the hard sheet 4 are separated by the elastic strip 5, and a plurality of steel fibers 6 are inserted into one side, close to the first pouring area, of the elastic strip 5.
The combined template 2 is adopted as a template for pouring UHPC, so that the steel fiber 6 is connected with the adjacent primary UHPC1 and secondary UHPC3; the elastic strip 5 can be used for applying three-way confining pressure to the steel fiber 6 inserted after pretensioning by pretensioning-loosening operation so as to better fix the steel fiber 6 and prevent the steel fiber 6 from shifting or falling off in the process of pouring UUHPC, and meanwhile, the elastic strip 5 has better ductility, can facilitate punching and inserting the steel fiber 6 and filling the combined template 2 as a template gap for pouring UHPC, and prevent UHPC from leaking slurry during pouring; the hard thin plate 4 is adopted as the framework of the combined template 2, and the framework has the function of providing stable support, so that the combined template 2 can bear various loads in the construction process, the stability of the pouring template is ensured, the framework has enough strength, the interface can better disperse stress when bearing external pressure, and the stability of joints is improved.
In this embodiment, the elastic strip 5 is a silica gel strip, two ends of the elastic strip 5 are provided with fixing structures, the fixing structures are magic tapes 7 adhered to two ends of the silica gel strip, the elastic strip 5 is fixed outside the hard sheet 4 by adopting the fixing structures, the hard sheet 4 is an aluminum alloy sheet, the fixing structures are provided with three fixing points, each fixing point comprises a first fixing point 8 and a second fixing point 9, and the stretching length of the elastic strip 5 when the elastic strip 5 is fixed by adopting the first fixing point 8 is greater than that of the second fixing point 9.
In the implementation process, three fixing points are arranged at two ends of the elastic strip 5, so that pretension and release operation of the elastic strip 5 are realized. The pretensioning operation enables a better fit of the elastic strip 5 around the stiff sheet 4, thereby improving its load-carrying capacity and stability. The loosening operation is opposite to the pretensioning operation, so that the elastic strip 5 maintains the reduced stretching length of the stretched state, and three-way confining pressure is applied to the steel fibers 6 inserted after pretensioning, so that the steel fibers 6 are well fixed, and the steel fibers 6 are prevented from being displaced or falling off in the pouring UUHPC process.
The thickness of the elastic strip 5 is equal to 1/2 of the length of the steel fibre 6. The thickness of the hard sheet 4 is 1/2 to 1/3 of the thickness of the elastic sheet. The elastic strip 5 is provided with a plurality of through holes, and steel fibers 6 are placed in the through holes. The angles of the through holes are randomly distributed, the number of the through holes is obtained according to the volume mixing amount of the steel fibers 6 in the ultra-high performance concrete, the volume mixing amount of the steel fibers 6 and the ultra-high performance concrete is 1-3%. In this embodiment, a silica gel strip with a thickness of 8 mm and an aluminum alloy sheet with a thickness of 2.5 mm are adopted, steel fibers 6 with a diameter of 0.2mm and a length of 16mm are adopted, the design volume doping amount of the steel fibers 6 is 1.8% based on the design volume doping amount of the steel fibers 6, the number of the steel fibers 6 at the joint is calculated, and angle random distributed punching is carried out on the silica gel strip according to the stress between the primary UHPC1 and the secondary UHPC3 and the number.
In this embodiment, the following construction method for the ultra-high performance concrete joint is adopted: s1, encircling a pretensioned elastic strip 5 around a hard sheet 4 with the same width along the length direction, and fixing the elastic strip 5 through a fixing structure, wherein the fixing structure selects a first fixing point 8 far away from the edge of the hard sheet 4; s2, punching a plurality of through holes with the diameter of 0.2 mm and the depth of 8 mm on the surface of the elastic strip 5, enabling the through holes to penetrate through the elastic strip 5, ensuring the surface of the hard sheet 4 to be intact, and calculating the number of the through holes according to the volume doping amount of the steel fibers 6 in the UHPC; s3, inserting steel fibers 6 with the diameter of 0.2 millimeter and the length of 16 millimeters into the through holes, loosening the elastic strips 5 after the insertion is finished, and fixing the elastic strips 5 through second fixing points 9 close to the edges of the hard thin plates 4; s4, taking the combination of the elastic strip 5-hard sheet 4-steel fiber 6 and the combination template 2 as a pouring template of a joint interface of the primary ultra-high performance concrete, and pouring UHPC1 once on one side of the combination template 2 exposed out of the steel fiber 6; s5, curing the UHPC1 poured in the step S4 once, after reaching the construction target age, unlocking the fixed structure of the elastic template, taking down the hard sheet 4, and then tearing off the elastic strip 5 to expose the 8 mm steel fiber 6 embedded in the elastic strip 5; s6, pouring the secondary UHPC3 on the side of the 8 mm steel fiber 6 exposed in the step S5 to form a UHPC interface seam.
Example 2
In this embodiment, a continuous composite form of interface structural steel fibers is provided. The interface structure comprises primary ultra-high performance concrete poured for the first time and secondary ultra-high performance concrete poured for the second time, and the combined template 2 is positioned at the interface of UHPC poured for the second time. The design goal of the combined template is to enable continuous steel fibers 6 to be applied to the joint of the primary UHPC1 and the secondary UHPC3, and the distribution of the steel fibers 6 is specially designed according to the performance requirement of the joint of the UHPC under each construction so as to improve the performance of the concrete joint and enable the concrete joint to be more excellent in bearing pressure and crack resistance.
The length of the combined template 2 is equal to the length of the UHPC interface of the two pouring processes. The UHPC hard sheet comprises an elastic strip 5 and a hard sheet 4, wherein the elastic strip 5 surrounds the hard sheet 4 along the length direction, separates the UHPC from the hard sheet 4, and facilitates the subsequent removal of the hard template and the fixation of the steel fibers 6. A number of steel fibres 6 are inserted on the side of the elastic strip 5 close to the first casting area.
The combined template 2 is used as a template for pouring UHPC, and the steel fibers 6 are connected with adjacent primary and secondary UHPC3. The elastic strips 5 can apply three-way confining pressure to the steel fibers 6 inserted after pretensioning through pretensioning-releasing operation so as to better fix the steel fibers 6 and prevent the steel fibers 6 from shifting or falling off in the UHPC pouring process. Meanwhile, the elastic strip 5 has good ductility, is convenient for punching and inserting the steel fiber 6 and filling the gap of the combined template 2, and prevents UHPC from leaking slurry during pouring. The hard sheet 4 is used as a framework of the combined template 2, provides stable support, ensures that the combined template 2 can bear various loads in the construction process, keeps stability, has enough strength, ensures that the interface can better disperse stress when bearing external pressure, and improves the stability of joints.
In this embodiment, the elastic strip 5 is made of TPE material, and has fixing structures at both ends. The fixing structure is that one end of the TPE strip is provided with an elastic ring 10 for fixing the rope sleeve and a plurality of rows of fixing bulges 12 at the other end. The elastic strip 5 is fixed outside the hard sheet 4 by a fixing structure. The hard sheet 4 is a resin sheet. In this embodiment, the fixing structure is provided with three fixing points, a row of fixing protrusions 12 far from the resin sheet is a first fixing point 8, and a row of fixing protrusions 12 near the resin sheet is a second fixing point 9. The elastic strip 5 has a greater extension when fastened at the first fastening point 8 than at the second fastening point 9.
In the implementation of this embodiment, pretensioning and releasing operation of the elastic strap 5 is achieved by providing three fixing points at both ends of the elastic strap 5. The pretensioning operation gives the elastic strip 5a better fit around the stiff sheet 4, thereby improving its load carrying capacity and stability. The relaxing operation is opposite to the pretensioning operation, but it should be noted that the elastic strip 5 is still kept in a stretched state, the relaxing operation reduces the stretched length, and applies a three-way confining pressure to the steel fiber 6 inserted after pretensioning to better fix the steel fiber 6, preventing the steel fiber 6 from being displaced or falling off during the casting of the UHPC.
The thickness of the elastic strip 5 is equal to 1/2 of the length of the steel fibre 6. The thickness of the hard sheet 4 is 1/2 to 1/3 of the thickness of the elastic sheet. The elastic strip 5 is provided with a plurality of through holes, and steel fibers 6 are placed in the through holes. The angles of the through holes are randomly distributed, the number of the through holes is obtained according to the volume mixing amount of the steel fibers 6 in the ultra-high performance concrete, the volume mixing amount of the steel fibers 6 and the ultra-high performance concrete is 1-3%. As shown in fig. 5, in this embodiment, a TPE tape with a thickness of 7 mm and a resin sheet with a thickness of 2mm were used, steel fibers 6 with a diameter of 0.2mm and a length of 14mm were used, the designed volume doping amount of the steel fibers 6 was 2.2% based on the designed volume doping amount of the steel fibers 6 to obtain the number of steel fibers 6 at the joint, and distributed punching was performed on the TPE tape with random angles according to the stress between the primary UHPC1 and the secondary UHPC3 and the number.
In this embodiment, the following construction method for the ultra-high performance concrete joint is adopted: s1, encircling a pretensioned elastic strip 5 around a hard sheet 4 with the same width along the length direction, and fixing the elastic strip 5 through a fixing structure, wherein the fixing structure selects a first fixing point 8 far away from the edge of the hard sheet 4; s2, punching a plurality of through holes with the diameter of 0.2 mm and the depth of 7 mm on the surface of the elastic strip 5, enabling the through holes to penetrate through the elastic strip 5, ensuring the surface of the hard sheet 4 to be intact, and calculating the number of the through holes according to the volume doping amount of the steel fibers 6 in the UHPC; s3, inserting steel fibers 6 with the diameter of 0.2 millimeter and the length of 14 millimeters into the through holes, loosening the elastic strips 5 after the insertion is finished, and fixing the elastic strips 5 through second fixing points 9 close to the edges of the hard thin plates 4; s4, taking the combination of the elastic strip 5-hard sheet 4-steel fiber 6 and the combination template 2 as a pouring template of a joint interface of the primary ultra-high performance concrete, and pouring UHPC1 once on one side of the combination template 2 exposed out of the steel fiber 6; s5, curing the UHPC1 poured in the step S4 once, after reaching the construction target age, unlocking the fixed structure of the elastic template, taking down the hard sheet 4, and then tearing off the elastic strip 5 to expose 7 mm steel fibers 6 embedded in the elastic strip 5; s6, pouring the secondary UHPC3 on the side of the 7 mm steel fiber 6 exposed in the step S5 to form a UHPC interface seam.
Example 3
In the embodiment, the interface structure comprises a first-time ultra-high-performance concrete poured for the first time and a second-time ultra-high-performance concrete poured for the second time, the combined template is positioned at an ultra-high-performance concrete interface 2 of the second-time pouring when in use, the design of the combined template aims at enabling continuous steel fibers 6 to be applied to the joint of a first UHPC1 and a second UHPC3, and the distribution of the steel fibers 6 can be specially designed according to different performances required by the joint of the UHPC under construction each time, so that the performance of the concrete joint is improved, and the concrete joint has more excellent performances in bearing pressure and crack resistance; the length of the combined template 2 is equal to the length of the interface of the ultra-high performance concrete poured twice; the combined formwork 2 comprises an elastic strip 5 and a hard sheet 4, the elastic strip 5 surrounds the hard sheet 4 along the length direction of the hard sheet 4, the ultra-high performance concrete and the hard sheet 4 are separated, the hard formwork and the fixed steel fibers 6 are conveniently removed, the ultra-high performance concrete and the hard sheet 4 are separated by the elastic strip 5, and a plurality of steel fibers 6 are inserted into one side, close to the first pouring area, of the elastic strip 5.
The combined template 2 is adopted as a template for pouring UHPC, so that the steel fiber 6 is connected with the adjacent primary UHPC1 and secondary UHPC3; the elastic strip 5 can be used for applying three-way confining pressure to the steel fiber 6 inserted after pretensioning by pretensioning-loosening operation so as to better fix the steel fiber 6 and prevent the steel fiber 6 from shifting or falling off in the process of pouring UUHPC, and meanwhile, the elastic strip 5 has better ductility, can facilitate punching and inserting the steel fiber 6 and filling the combined template 2 as a template gap for pouring UHPC, and prevent UHPC from leaking slurry during pouring; the hard thin plate 4 is adopted as the framework of the combined template 2, and the framework has the function of providing stable support, so that the combined template 2 can bear various loads in the construction process, the stability of the pouring template is ensured, the framework has enough strength, the interface can better disperse stress when bearing external pressure, and the stability of joints is improved.
In this embodiment, as shown in fig. 6 and 7, a rubber strip is selected as the elastic strip 5, and fixing structures are provided at both ends thereof. The fixing structure is characterized in that fixing holes 11 are formed in two ends of a rubber strip, and four rows of fixing protrusions 12 with two symmetrical ends are arranged on an acrylic sheet. The elastic strip 5 is fixed outside the acrylic sheet by a fixing structure. In this embodiment, the fixing structure is symmetrically arranged and has two fixing points. Taking one side of the acrylic sheet as an example, a row of fixing protrusions 12 far from the edge of the acrylic sheet in the length direction is used as a first fixing point 8, and a row of fixing protrusions 12 near the edge of the acrylic sheet in the length direction is used as a second fixing point 9. The elastic strip 5 has a greater stretched length at the first fixing point 8 than at the second fixing point 9.
In practice, pretensioning and releasing of the elastic strip 5 is achieved by providing three fixing points at both ends of the elastic strip 5. The pretensioning operation gives the elastic strip 5 a better fit around the stiff sheet 4, thereby improving its load carrying capacity and stability. The loosening operation is opposite to pretension, so that the elastic strip 5 is kept in a stretched state, the stretching length is reduced, the three-way confining pressure is applied to the steel fibers 6 inserted after pretension, the steel fibers 6 are well fixed, and the steel fibers 6 are prevented from being displaced or falling off in the process of pouring ultra-high performance concrete.
The thickness of the elastic strip 5 is equal to 1/2 of the length of the steel fibre 6. The thickness of the hard sheet 4 is 1/2 to 1/3 of the thickness of the elastic sheet. The elastic strip 5 is provided with a plurality of through holes for placing steel fibers 6. The angle of the through holes is randomly distributed, and the number of the through holes is determined according to the volume doping amount of the steel fibers 6 in the ultra-high-performance concrete. In this example, the volume doping amount of the steel fiber 6 in the ultra-high performance concrete is 1% to 3%. A rubber strip with a thickness of 9mm, an acrylic sheet with a thickness of 3 mm, and steel fibers 6 with a diameter of 0.2mm and a length of 18mm were used. The number of steel fibers 6 at the joint is calculated according to the design volume mixing amount of the steel fibers 6, and the angle random distributed punching is carried out on the rubber strip according to the corresponding number according to the stress between the primary UHPC1 and the secondary UHPC 3.
In this embodiment, the following construction method for the ultra-high performance concrete joint is adopted: s1, encircling a pretensioned elastic strip 5 around a hard sheet 4 with the same width along the length direction, and fixing the elastic strip 5 through a fixing structure, wherein the fixing structure selects a first fixing point 8 far away from the edge of the hard sheet 4; s2, punching a plurality of through holes with the diameter of 0.2 mm and the depth of 9 mm on the surface of the elastic strip 5, enabling the through holes to penetrate through the elastic strip 5, ensuring the surface of the hard sheet 4 to be intact, and calculating the number of the through holes according to the volume doping amount of the steel fibers 6 in the UHPC; s3, inserting steel fibers 6 with the diameter of 0.2 mm and the length of 18 mm into the through holes, loosening the elastic strips 5 after the insertion is finished, and fixing the elastic strips 5 through second fixing points 9 close to the edges of the hard thin plates 4; s4, taking the combination of the elastic strip 5-hard sheet 4-steel fiber 6 and the combination template 2 as a pouring template of a joint interface of the primary ultra-high performance concrete, and pouring UHPC1 once on one side of the combination template 2 exposed out of the steel fiber 6; s5, curing the UHPC1 poured in the step S4 once, after reaching the construction target age, unlocking the fixed structure of the elastic template, taking down the hard sheet 4, and then tearing off the elastic strip 5 to expose the 9 mm steel fiber 6 embedded in the elastic strip 5; s6, pouring the secondary UHPC3 on the side of the 9 mm steel fiber 6 exposed in the step S5 to form a UHPC interface seam.
The invention solves the problems of the prior art and has the following advantages that the elastic strip 5 is made of elastic material, and the hard sheet 4 is made of hard material. The elastic strips 5 can apply three-way confining pressure to the inserted steel fibers 6 through pre-tensioning-loosening operation so as to better fix the steel fibers 6 and prevent the steel fibers 6 from shifting or falling off in the UHPC pouring process; secondly, the UHPC has excellent fluidity, and the elastic strip 5 fills the template seam to prevent the UHPC from leaking slurry; the elastic strip 5 is soft and convenient to detach; the hard sheet 4 has enough strength and rigidity and is mainly used for bearing various loads possibly occurring in the construction process and ensuring the stability of the pouring template.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions, without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (10)
1. The continuous combined template for the steel fibers of the interface structure is characterized in that the interface structure comprises primary ultra-high-performance concrete poured for the first time and secondary ultra-high-performance concrete poured for the second time, the combined template is positioned at an ultra-high-performance concrete interface of the two times when in use, and the length of the combined template is equal to that of the ultra-high-performance concrete interface of the two times;
The combined template comprises an elastic strip and a hard sheet, wherein the elastic strip surrounds the hard sheet along the length direction of the hard sheet, the elastic strip separates ultra-high performance concrete from the hard sheet, and a plurality of steel fibers are inserted into one side of the elastic strip, which is close to the first pouring area.
2. The continuous combined template for the steel fibers of the interface structure according to claim 1, wherein fixing structures are arranged at two ends of the elastic strip, the elastic strip is fixed outside the hard sheet by adopting the fixing structures, the fixing structures are provided with at least two fixing points, the fixing points comprise a first fixing point and a second fixing point, and the stretching length of the elastic strip when the elastic strip is fixed by adopting the first fixing point is larger than that of the second fixing point.
3. A continuous composite form according to claim 2 wherein said elastomeric strip has a thickness equal to 1/2 of the length of the steel fibers.
4. A continuous composite formwork panel according to claim 3 wherein the thickness of the rigid sheet is 1/2 to 1/3 of the thickness of the resilient sheet.
5. The continuous composite formwork of steel fibers in interface structure according to claim 1, wherein the elastic strip is provided with a plurality of through holes, and the steel fibers are placed through the through holes.
6. The continuous combined formwork for the steel fibers of the interface structure according to claim 5, wherein the angles of the through holes are randomly distributed, the number of the through holes is obtained according to the volume mixing amount of the steel fibers in the ultra-high-performance concrete, and the volume mixing amount of the steel fibers in the ultra-high-performance concrete is 1-3%.
7. A construction method of a continuous combined template of interface structural steel fibers, comprising the continuous combined template of interface structural steel fibers as set forth in any one of claims 1 to 6, wherein the combined template is used as a pouring template of a joint interface of primary ultra-high performance concrete; before the elastic strip is inserted into the steel fiber, the fixing structure of the elastic strip is fixed by adopting a first fixing point; after the elastic strip is inserted into the steel fiber, the fixing structure of the elastic strip is fixed by adopting a second fixing point.
8. The construction method of the continuous combined formwork of the interface structure steel fibers according to claim 7, wherein after the fixing structure of the elastic strip is fixed by adopting a first fixing point, a through hole is punched on one side, close to the first pouring area, of the elastic strip.
9. The construction method of the continuous combined formwork of the interface structural steel fibers according to claim 7 or 8, wherein the fixing structure of the elastic strip is installed as a pouring formwork of the joint interface of the primary ultra-high-performance concrete after being fixed by the second fixing point.
10. The method for constructing a composite formwork continuous with steel fibers in an interface structure according to claim 9, wherein the composite formwork is removed from the hard sheet and the elastic strip after one ultra-high performance concrete pouring maintenance is completed.
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| CN202410321674.5A CN118207799A (en) | 2024-03-20 | 2024-03-20 | Continuous combined template of interface structural steel fibers and construction method |
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| CN202410321674.5A CN118207799A (en) | 2024-03-20 | 2024-03-20 | Continuous combined template of interface structural steel fibers and construction method |
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