CN115341671A - UHPC seam interface processing method with controllable roughness and continuous interface - Google Patents
UHPC seam interface processing method with controllable roughness and continuous interface Download PDFInfo
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- CN115341671A CN115341671A CN202211006638.7A CN202211006638A CN115341671A CN 115341671 A CN115341671 A CN 115341671A CN 202211006638 A CN202211006638 A CN 202211006638A CN 115341671 A CN115341671 A CN 115341671A
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- steel wire
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- roughness
- concrete
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- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 61
- 238000003672 processing method Methods 0.000 title claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 66
- 239000010959 steel Substances 0.000 claims abstract description 66
- 239000004567 concrete Substances 0.000 claims abstract description 29
- 239000000835 fiber Substances 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims description 21
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 claims description 5
- 238000004873 anchoring Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 7
- 238000005266 casting Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 5
- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract description 2
- 238000009415 formwork Methods 0.000 description 12
- 238000010276 construction Methods 0.000 description 5
- 238000007788 roughening Methods 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000011178 precast concrete Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000001680 brushing effect Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- 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
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/66—Sealings
- E04B1/68—Sealings of joints, e.g. expansion joints
-
- 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
- E01D19/06—Arrangement, construction or bridging of expansion joints
- E01D19/067—Flat continuous joints cast in situ
-
- 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
- E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the field of civil engineering, in particular to a UHPC joint interface processing method with controllable roughness and continuous interface. Arranging steel wire meshes on the inner sides of end templates of a casting mold, and assembling the side templates and the end templates with the steel wire meshes to form the casting mold; the pouring molds are arranged in sections according to pouring capacity; a seam is reserved in front of the adjacent casting mold; pouring ultrahigh-performance concrete at the end mould to form a smooth interface; after the maintenance is finished, the pouring mold is dismantled, and the steel wire meshes are pulled out at the same time; respectively building vertical templates on two sides of the reserved joint twice; and performing secondary pouring of the ultra-high performance concrete to form a post-poured concrete joint. The invention realizes the high roughness of the interface which is difficult to realize by the traditional interface processing mode and can not damage the concrete base material; the interface has a standard grid groove scribing effect, the interface roughness can be accurately controlled, and the interface roughness can be adjusted and controlled; the interface steel fiber at the seam is continuous.
Description
Technical Field
The invention relates to the field of civil engineering, in particular to a UHPC joint interface treatment method with controllable roughness and continuous interface.
Background
The ultra-high performance concrete (UHPC) is a novel cement-based composite material, has excellent physical and mechanical properties, high tensile and compressive strength, good toughness and durability, and small creep under the action of long-term load. The UHPC has high ultimate tensile strain and high tensile strength, and the fibers after tensile cracking have a bridging effect, thereby ensuring the tensile property of the matrix. UHPC is widely applied to new construction and reinforcement engineering at home and abroad due to the excellent mechanical property. Researches show that in engineering and experiments, a sectional layered pouring mode is adopted for pouring the UHPC, and sectional pouring causes discontinuity of steel fibers at the inner interface of each section of the UHPC and difficulty in exerting a bridging effect, so that the bonding force at the interface is weak and the structural integrity is poor.
In order to improve the bonding performance of a sectional pouring UHPC interface, an interface agent brushing method and an interface roughening method are mostly adopted in engineering practice and scientific research at present. However, the traditional processing method cannot meet the roughness requirement, and the roughness is not controllable; the interface bridging effect of the steel fiber is difficult to play by adopting a brushing method, the structure cannot generate multi-crack cracking under stress, the interface bonding characteristic is similar to that of common concrete, and the ultrahigh performance of UHPC is difficult to play; and the roughening method has lower construction efficiency for UHPC, and the common roughening method can not carve grooves on the UHPC base material and cause material damage to the UHPC structure. Therefore, innovative applications are necessary to achieve high adhesion of UHPC interfaces.
Disclosure of Invention
The invention aims to provide a UHPC joint interface treatment method with controllable roughness and continuous interface, which is characterized in that a steel wire mesh is shallowly buried in concrete, the steel wire mesh is pulled out by removing a mould and a proper amount of concrete is taken out, a certain interface roughness is obtained while steel fiber is exposed, and the interface bonding property of a UHPC structure is improved.
The invention adopts the following technical scheme:
the UHPC joint interface processing method with controllable roughness and continuous interface comprises the following steps:
step (1), arranging steel wire meshes on the inner side of an end template of a pouring mould, wherein the distance between a steel wire network and the end template is 10-20 mm;
step (2), assembling the side templates and the end templates with the steel wire meshes to form a pouring mold; the pouring molds are arranged in sections according to the pouring capacity; a seam is reserved in front of the adjacent casting mold; carrying out primary ultra-high performance concrete pouring in the pouring mould, and forming a smooth interface at the end mould;
step (3) curing the ultra-high performance concrete poured in the step (2), dismantling the pouring mold after curing is finished, and simultaneously pulling out the steel wire meshes; the concrete interface at the end part forms naked steel fibers and gridding notches matched with the shape of the steel wire meshes;
step (4), building vertical templates on two sides of the joint reserved in the step (2) for two times respectively; and performing secondary pouring of the ultra-high performance concrete to form a post-poured concrete joint.
According to the UHPC joint interface treatment method with controllable roughness and continuous interface, the diameter of steel wires adopted by the steel wire meshes is 2-4 mm; the interval of each grid in the steel wire mesh is controlled to be 10mm-20mm.
According to the UHPC seam interface processing method with controllable roughness and continuous interface, the steel wire meshes are rectangular meshes, rhombic meshes or circular meshes.
According to the UHPC joint interface processing method with controllable roughness and continuous interface, the steel wire meshes are fixed by binding, cementing, fixing by a gas nail gun and fixing by an end template.
According to the UHPC joint interface treatment method with controllable roughness and continuous interface, the bare steel fibers in the step (4) are anchored into the post-cast concrete plate.
Advantageous effects
The UHPC joint interface processing method with controllable roughness and continuous interface provided by the invention can realize high interface roughness which is difficult to realize by the traditional interface processing mode and can not damage a concrete base material; the interface presents a standard grid groove scribing effect, the interface roughness can be accurately controlled, and the interface roughness can be adjusted and controlled; the steel fiber at the interface of the joint is continuous, the concrete interface at the joint, which cannot be realized by a coating interface agent method and a scabbling method, is continuous, and the integrity of the joint is greatly improved; meanwhile, the construction process is simple, the construction efficiency is high, and the problems of time consumption and labor consumption in the traditional ultra-high performance concrete joint interface treatment can be solved.
The UHPC joint interface processing method with controllable roughness and continuous interface, provided by the invention, realizes steel fiber exposure at the joint interface by pre-embedding steel wire meshes on a concrete pouring template, obtains the ultra-large roughness which is difficult to realize by the traditional processing method, and can realize adjustable and controllable interface roughness by accurately controlling the interface roughness by adjusting the area of the steel wire meshes and the space between the steel wire meshes.
The UHPC joint interface processing method with controllable roughness and continuous interface provided by the invention has the advantages that steel fibers at the joint interface are continuous, the concrete interface at the joint is continuous, the bonding performance of the interface is greatly improved, the force transmission effect of the ultra-high performance concrete interface is improved, the shear-resistant bearing capacity of the interface is greatly improved, and the construction quality can be ensured;
the UHPC joint interface processing method is simple to operate and low in cost, the steel wire meshes are fixed on a template, the meshes are pulled out when the template is removed, equipment can be repeatedly used, compared with manual roughening, the UHPC joint interface processing method is free from greatly reducing the damage cost of UHPC materials, and is simple to operate and free from generating noise and dust.
The invention has wide application range, can be suitable for structural forms such as I-shaped beams, T-shaped beams, box beams and the like, is suitable for horizontal joints of various scales, and has wide applicability and higher reliability.
Drawings
FIG. 1 is a schematic diagram of a rectangular wire mesh grid structure of the present invention;
FIG. 2 is a schematic diagram of a rhombus wire lattice structure of the present invention;
FIG. 3 is a schematic diagram of a circular steel wire mesh structure according to the present invention;
FIG. 4 is a schematic view of the mold after installation of the wire mesh grid of the present invention;
FIG. 5 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 4;
FIG. 6 is a schematic view of the present invention illustrating cast-in-place concrete placement;
FIG. 7 is a schematic view of the interface structure after the removal of the mold according to the present invention;
FIG. 8 is a schematic view of the present invention illustrating the completion of the seam casting;
wherein: 1. rectangular steel wire meshes; 2. rhombus steel wire meshes; 3. circular steel wire meshes; 4. pouring end templates with concrete; 5. riveting; 6. pouring concrete into the side formwork; 7. reserving space between the grids and the end template; 8. pouring concrete firstly; 9. steel fibers; 10. grooving the grids; 11. and post-pouring concrete.
Detailed Description
In order to make the purpose and technical solution of the embodiments of the present invention clearer, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
Example 1:
the UHPC seam interface treatment method with controllable roughness and continuous interface comprises the following steps:
1. as shown in fig. 1 and 4, a rectangular steel wire mesh 1 is adopted, the diameter of the steel wire is 3mm, and the distance between meshes is 15mm. Fixing the steel wire mesh 1 on a concrete pouring end formwork 6 by using rivets 5, and reserving 15mm intervals 7 between the steel wire mesh 1 and the end formwork 6;
2. as shown in fig. 5 and 6, the templates are completely assembled, ultra-high performance concrete is poured on one end of each template layer by layer to form pre-cast concrete 8, and a smooth interface is formed on the template at the end;
3. as shown in fig. 7, after the pre-cast concrete reaches the specified curing time, the end formwork 4 is removed and the rectangular steel wire mesh 1 is pulled out, the exposed steel fiber 9 and the gridding notch 10 are formed at the interface, then the side formwork 6 is removed, and the bottom formwork is removed after the ultra-high performance concrete reaches the standard strength;
4. as shown in fig. 8, a formwork is erected at the joint interface again, the ultrahigh-performance concrete is poured for the second time to form post-cast concrete 11, and efficient bonding of the ultrahigh-performance concrete joint interface is achieved after curing is completed.
Example 2:
the UHPC seam interface treatment method with controllable roughness and continuous interface comprises the following steps:
1. rhombic steel wire grids 2 are adopted, the diameter of the steel wires is 2mm, and the space between the grids is 10mm. Fixing the rhombic steel wire meshes 2 on a concrete pouring end template 4 by using an air nail gun, and reserving 10mm intervals 7 between the rhombic steel wire meshes 2 and the end template 4;
2. completely assembling the templates, pouring ultra-high performance concrete at one end of each template in a layering manner to form pre-cast concrete 8, and forming a smooth interface on the template at the end;
3. after the concrete is poured in advance for a specified curing time, the end template 4 is dismantled, the steel wire meshes 2 are pulled out, exposed steel fibers 9 and gridding carving grooves 10 are formed in the interface, then the side template 6 is dismantled, and the bottom die is dismantled after the ultrahigh-performance concrete reaches the standard strength;
4. and erecting the template again at the joint interface, performing secondary pouring of the ultra-high performance concrete to form post-poured concrete 11, and realizing efficient bonding of the ultra-high performance concrete joint interface after maintenance is finished.
Example 3:
the UHPC seam interface treatment method with controllable roughness and continuous interface comprises the following steps:
1. circular steel wire meshes 3 are adopted, the diameter of a steel wire is 4mm, and the distance between meshes is 20mm. Fixing the steel wire meshes 3 on the concrete pouring end formwork 4 by using a strong glue, and reserving 20mm intervals 7 between the steel wire meshes 3 and the end formwork 4;
2. completely assembling the templates, pouring ultra-high performance concrete at one end of each template in a layering manner to form pre-cast concrete 8, and forming a smooth interface on the template at the end;
3. after the cast-in-place concrete reaches the specified curing time, the end formwork 4 is dismantled and the steel wire meshes 2 are pulled out, the exposed steel fibers 9 and the gridding carved grooves 10 are formed at the interface, then the side formwork 6 is dismantled, and the bottom formwork is dismantled after the ultra-high performance concrete reaches the standard strength;
4. and erecting the template again at the joint interface, performing secondary pouring of the ultra-high performance concrete to form post-cast concrete 11, and realizing efficient bonding of the ultra-high performance concrete joint interface after maintenance is finished.
By adopting the method, the steel wire meshes are utilized to treat the ultra-high performance concrete joint interface to replace the original manual and mechanical roughening treatment method or the original treatment method of the interface agent, so that the steel fibers at the joint interface are exposed, uniform meshed notches are formed, the continuity of the steel fibers at the interface is ensured, and the bonding strength and the impermeability of the ultra-high performance concrete joint interface are ensured. Because only need survey fixed wire net check in the template when the equipment template, saved the time of scribbling the interfacial agent, also avoided simultaneously because of the matrix damage that the chisel hair brought to the cast-in-place concrete, also can not produce powder and noise pollution simultaneously, be applicable to the level ultrahigh performance concrete joint of handling various scales.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (5)
1. The UHPC seam interface processing method with controllable roughness and continuous interface is characterized in that: the method comprises the following steps:
step (1), arranging steel wire meshes on the inner side of an end template of a pouring mould, wherein the distance between a steel wire network and the end template is 10-20 mm;
step (2), assembling the side templates and the end templates with the steel wire meshes to form a pouring mold; the pouring molds are arranged in sections according to the pouring capacity; a seam is reserved in front of the adjacent pouring mold; carrying out the first ultra-high performance concrete pouring in the pouring mould, and forming a smooth interface at the end mould;
step (3) curing the ultra-high performance concrete poured in the step (2), removing the pouring mould after curing, and simultaneously pulling out the steel wire mesh grids; the concrete interface at the end part forms naked steel fibers and gridding notches matched with the shape of the steel wire meshes;
step (4), building vertical templates on two sides of the joint reserved in the step (2) for two times respectively; and performing secondary pouring of the ultra-high performance concrete to form a post-poured concrete joint.
2. The UHPC joint interface processing method with controllable roughness and continuous interface according to claim 1, wherein: the diameter of the steel wire adopted by the steel wire mesh is 2mm-4mm; the interval of each grid in the steel wire mesh is controlled to be 10mm-20mm.
3. The UHPC joint interface treatment process with controlled roughness and continuous interface according to claim 1 or 2, characterized by: the shape of the steel wire mesh is a rectangular mesh, a rhombic mesh or a circular mesh.
4. A UHPC seam interface processing method with controlled roughness and continuous interface according to claim 1 or 2 or 3 characterized by that: the steel wire meshes are fixed by adopting binding, cementing and fixing, and fixing by using a gas nail gun and fixing by using an end template.
5. The UHPC joint interface treatment process with controlled roughness and continuous interface as claimed in claim 1, wherein: and (4) anchoring the bare steel fibers into the post-cast concrete plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211006638.7A CN115341671A (en) | 2022-08-22 | 2022-08-22 | UHPC seam interface processing method with controllable roughness and continuous interface |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211006638.7A CN115341671A (en) | 2022-08-22 | 2022-08-22 | UHPC seam interface processing method with controllable roughness and continuous interface |
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| Publication Number | Publication Date |
|---|---|
| CN115341671A true CN115341671A (en) | 2022-11-15 |
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| CN202211006638.7A Pending CN115341671A (en) | 2022-08-22 | 2022-08-22 | UHPC seam interface processing method with controllable roughness and continuous interface |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002061296A (en) * | 2000-08-15 | 2002-02-28 | Taisei Corp | Structure of joint and construction method therefor |
| CN203361643U (en) * | 2013-06-27 | 2013-12-25 | 中国二十冶集团有限公司 | Removing-free and dabbing-free template provided with preformed holes |
| CN107060117A (en) * | 2017-04-25 | 2017-08-18 | 福州大学 | The continuous construction method of seam crossing fiber is realized in concrete gradation casting process |
| CN109629416A (en) * | 2018-12-10 | 2019-04-16 | 同济大学 | A kind of wet joint construction method of fiber concrete floorings |
-
2022
- 2022-08-22 CN CN202211006638.7A patent/CN115341671A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002061296A (en) * | 2000-08-15 | 2002-02-28 | Taisei Corp | Structure of joint and construction method therefor |
| CN203361643U (en) * | 2013-06-27 | 2013-12-25 | 中国二十冶集团有限公司 | Removing-free and dabbing-free template provided with preformed holes |
| CN107060117A (en) * | 2017-04-25 | 2017-08-18 | 福州大学 | The continuous construction method of seam crossing fiber is realized in concrete gradation casting process |
| CN109629416A (en) * | 2018-12-10 | 2019-04-16 | 同济大学 | A kind of wet joint construction method of fiber concrete floorings |
Non-Patent Citations (1)
| Title |
|---|
| 王宁，王晨源等: "UHPC 结构界面处理方法研究综述", 城市住宅, no. 8, pages 255 - 256 * |
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