CN110630030A - P-UHPC reinforcing device for reinforced concrete structure and construction method thereof - Google Patents
P-UHPC reinforcing device for reinforced concrete structure and construction method thereof Download PDFInfo
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- CN110630030A CN110630030A CN201910877487.4A CN201910877487A CN110630030A CN 110630030 A CN110630030 A CN 110630030A CN 201910877487 A CN201910877487 A CN 201910877487A CN 110630030 A CN110630030 A CN 110630030A
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- 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
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0203—Arrangements for filling cracks or cavities in building constructions
- E04G23/0211—Arrangements for filling cracks or cavities in building constructions using injection
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- 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
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
Abstract
The invention relates to the field of structural reinforcement of constructional engineering, and discloses a P-UHPC (P-ultra high Performance concrete) reinforcement device for a reinforced concrete structure and a construction method thereof. The P-UHPC reinforcing device for the reinforced concrete structure comprises an UHPC reinforcing layer and connecting steel bars, wherein the UHPC reinforcing layer and the connecting steel bars are fixed at the bottom of the reinforced concrete structure, one ends of the connecting steel bars are fixed in the reinforced concrete structure, the other ends of the connecting steel bars are fixed in the UHPC reinforcing layer, reinforcing layer steel bars and corrugated pipes are fixedly arranged in the UHPC reinforcing layer in a penetrating mode along the length direction of the UHPC reinforcing layer, steel stranded wires are fixedly arranged in the corrugated pipes in a penetrating mode, and two ends, extending out of the corrugated pipes, of the steel stranded wires are respectively anchored on the UHPC reinforcing layer. The reinforcement structure can effectively improve the rigidity, the bending strength and the crack resistance of the original structure, has good durability, short construction period and high reinforcement efficiency, and can meet the requirements of bending resistance and reinforcement of various projects.
Description
Technical Field
The invention relates to the field of structural reinforcement of constructional engineering, in particular to a P-UHPC reinforcing device for a reinforced concrete structure and a construction method thereof.
Background
At present, the problems of cracking damage, insufficient bending resistance bearing capacity and the like generally exist in an aged reinforced concrete structure in civil engineering construction, and the overall performance of the structure is also reduced due to the influence of factors such as poor construction quality, severe use environment or natural disasters on part of newly-built structures. Therefore, reinforcing a problematic reinforced concrete structure in order to eliminate the potential safety hazard existing within the service life of the structure has become an important branch of the civil engineering industry.
The traditional reinforcing method for the reinforced concrete structure mainly comprises a section enlarging method, a sticking reinforcing method, an external prestress reinforcing method, a high-strength soft steel wire rope and polymer reinforcing method and the like. The section increasing method is characterized in that longitudinal steel bars are additionally arranged by chiseling an original concrete structure protective layer, and the section size of a main beam is increased; the sticking and reinforcing method adopts chemical binders such as epoxy resin and the like or sticks reinforcing materials on the surface of the original concrete structure through anchor bolts, and the reinforcing materials and the original structure form a stressed whole, so that the bearing capacity and the rigidity of the original structure are improved; the external prestress reinforcing method applies prestress to the original concrete structure by adopting a prestress rib with corrosion resistance outside the structure or in a box girder; the high-strength soft steel wire rope and polymer reinforcing method uses polymer mortar to connect a prestressed steel wire strand net and a concrete structure into a whole, the high-strength prestressed steel wire strand net and the permeable polymer mortar play different roles in a reinforcing system, the steel wire strand net improves the bearing capacity of the structure, and a mortar layer plays a role in protection and bonding.
The traditional reinforcing method is influenced by material performance, structural form and construction process, and has certain limitations, such as large construction workload, long period, difficult guarantee of construction quality and unsatisfactory reinforcing effect of the section increasing method; the technical requirements of a bonding reinforcement method on constructors are high, the structural adhesive is prone to bonding failure due to improper surface treatment of the reinforcement layer, the reinforcement effect is not ideal, and the organic adhesive has the problem of high-temperature timeliness; the construction process of the external prestress reinforcement method is complex, external prestress tendons are easy to corrode to cause durability problems, and the prestressed tendon anchoring area has the problems of stress concentration and insufficient structural ductility; the reinforcing method of the prestressed high-strength mild steel wire and the polymer is limited by material performance, the level of the prestressed force which can be applied is lower, the reinforcing effect is limited, the mortar layer is easy to fatigue crack, and the durability of the structure is greatly reduced.
Because of the defects of the conventional reinforcement method, research and application of the novel reinforcement technology are paid great attention and attention in the industry.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provides a P-UHPC reinforcing device for a reinforced concrete structure and a construction method thereof.
In order to achieve the above object, the present invention provides a P-UHPC reinforcement device for a reinforced concrete structure, including a UHPC reinforcement layer fixed at the bottom of the reinforced concrete structure and a connection steel bar, one end of the connection steel bar is fixed in the reinforced concrete structure, and the other end of the connection steel bar is fixed in the UHPC reinforcement layer, wherein a reinforcement layer steel bar and a corrugated pipe are fixedly arranged in the UHPC reinforcement layer along the length direction, a steel strand is fixedly arranged in the corrugated pipe, and two ends of the steel strand extending out of the corrugated pipe are respectively anchored on the UHPC reinforcement layer.
Preferably, the UHPC reinforcing layer and the reinforced concrete structure are fixed by pouring ultrahigh-performance concrete.
Preferably, the end face of the reinforced concrete structure, which is in contact with the UHPC reinforcing layer, is a roughened surface, the roughened surface is provided with a groove and a bar planting hole, the UHPC reinforcing layer further comprises a plurality of protruding blocks, the protruding blocks are poured and fixed in the groove, an orifice of the bar planting hole faces the UHPC reinforcing layer, and one end of the connecting steel bar is planted and inserted in the bar planting hole.
Preferably, the thickness of the middle part is thinner than that of the end part along the length direction of the UHPC reinforcing layer, wherein the thickness of the middle part is 50-60mm, and the thickness of the end part is 100-120 mm.
Preferably, the UHPC reinforcing layer is formed by pouring toughened ultrahigh-performance concrete, and the connecting steel bars are high-strength steel bars.
Preferably, two ends of the UHPC reinforcing layer in the length direction are provided with steel backing plates, and two ends of the steel strand are respectively anchored on the UHPC reinforcing layer together with the corresponding steel backing plates through anchors.
The invention provides a construction method of a P-UHPC reinforcing device for a reinforced concrete structure, which comprises the following steps:
s1, erecting a template of a UHPC reinforcing layer at the bottom of a region to be reinforced of the reinforced concrete structure, arranging reinforcing layer steel bars and corrugated pipes along the length direction of the template, fixing one end of a connecting steel bar at the bottom of the region to be reinforced of the reinforced concrete structure, and positioning the other end of the connecting steel bar in an inner cavity of the template;
s2, wetting the bottom surface of a region to be reinforced of the reinforced concrete structure, pouring ultra-high performance concrete in the template, curing to form a UHPC reinforcing layer, and dismantling the template;
s3, penetrating steel strands in the corrugated pipe, and anchoring two ends of each steel strand on the UHPC reinforcing layer after the steel strands are tensioned to control stress;
and S4, injecting cement paste into the corrugated pipe, and spraying antirust paint on the exposed steel strand.
Preferably, step S1 further includes: and carrying out chiseling treatment on the bottom surface of a region to be reinforced of the reinforced concrete structure to form a chiseled surface, cutting a groove on the chiseled surface, drilling a bar-planting hole, and then erecting a template of the UHPC reinforcing layer.
Preferably, the process of fixing one end of the connection bar to the bottom of the region of the reinforced concrete structure to be reinforced in step S1 includes: and injecting bar planting glue into the bar planting holes and planting and inserting the connecting steel bars.
Preferably, step S3 further includes: and installing steel backing plates at two ends of the UHPC reinforcing layer in the length direction, and anchoring two ends of the steel strand and the corresponding steel backing plates on the UHPC reinforcing layer by using an anchorage device.
Through the technical scheme, the invention has the beneficial effects that:
1. the P-UHPC reinforcing device for the reinforced concrete structure adopts the matching use of the ultra-high performance concrete, reinforcing steel bars of the reinforcing layer and low-relaxation prestressed steel strands, so that the interior of the UHPC reinforcing layer has pre-stress, namely a P-UHPC structure is formed, the mechanical property and the durability are superior to the combination of polymer mortar and high-strength soft steel wires, the pre-stress level of the original damaged reinforced concrete structure can be greatly improved, and the anti-bending reinforcing effect is obvious;
2. according to the P-UHPC reinforcing device for the reinforced concrete structure, the pre-pressing stress exists in the UHPC reinforcing layer, the UHPC reinforcing layer and the original damaged reinforced concrete structure are fixed to form an integral work together, the original damaged reinforced concrete structure is subjected to the pre-pressing stress through the ultra-high performance concrete-common concrete interface, so that the ultra-high strength performance of the ultra-high performance concrete is fully exerted, and the anti-cracking strength of the original damaged reinforced concrete structure is effectively improved;
3. the roughened surface of the reinforced concrete structure is provided with the groove and the embedded steel bar structure, so that the shear strength and the ductility between the UHPC reinforcing layer and the reinforced concrete structure can be improved, the premature debonding failure of an ultra-high performance concrete-common concrete interface is prevented, the local thickness of the end part of the UHPC reinforcing layer is increased, and the risk of local compression cracking of the anchoring end of the reinforcing layer is reduced;
4. the P-UHPC reinforcing device for the reinforced concrete structure has the advantages of short construction period, high reinforcing efficiency, light dead weight and good durability of the ultra-high performance concrete, the thickness of the middle part of the UHPC reinforcing layer is 40-60mm, the size is small, the overload burden on the original reinforced concrete structure can not be caused, and the P-UHPC reinforcing device is suitable for various construction and use environments.
Drawings
Fig. 1 is a schematic structural view of one embodiment of a P-UHPC reinforcement device for a reinforced concrete structure according to the present invention;
figure 2 is a schematic structural view of one embodiment of a roughened surface of a reinforced concrete structure of the present invention;
FIG. 3 is a cross-sectional reinforcement view of one embodiment of a UHPC reinforcement layer of the present invention;
figure 4 is a schematic end view of one embodiment of a UHPC reinforcement layer in accordance with the present invention.
Description of the reference numerals
1 reinforced concrete structure 2 roughened surface
3 UHPC reinforced layer 4 bar planting hole
5 connecting reinforcement 6 groove
7 steel strand 8 reinforced layer steel bar
9 corrugated pipe 10 steel backing plate
11 anchor device
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, and it is to be understood that the detailed description is provided for purposes of illustration and explanation and is not intended to limit the scope of the invention.
It should be noted that in the following description of the present invention, the terms "bottom", "inner cavity", and the like are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which are only used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise specifically stated or limited, the terms "fixed" and "anchored" are to be understood in a broad sense, and may be, for example, a cast-in-place fixed connection, a detachable connection, or an integral connection; the connection may be direct or indirect through an intermediate medium, and may be a communication between two components or an interaction relationship between two components. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. It should be explained that the UHPC in the present invention is an Ultra-High Performance Concrete (UHPC for short), which refers to a cement-based structural engineering material with definite Performance indexes, new constitutive relation and long structural life; the P-UHPC is Prestressed Ultra-high performance Concrete (P-UHPC for short), and refers to an Ultra-high performance Concrete structure with prestress inside.
The P-UHPC reinforcement device for a reinforced concrete structure provided by the first aspect of the present invention, as shown in fig. 1-4, comprises a UHPC reinforcement layer 3 and a connecting steel bar 5 fixed at the bottom of a reinforced concrete structure 1, wherein one end of the connecting steel bar 5 is fixed in the reinforced concrete structure 1, and the other end is fixed in the UHPC reinforcement layer 3, a reinforcement layer steel bar 8 and a corrugated pipe 9 are fixedly penetrated in the UHPC reinforcement layer 3 along the length direction, a steel strand 7 is fixedly penetrated in the corrugated pipe 9, and two ends of the steel strand 7 extending out of the corrugated pipe 9 are respectively anchored on the UHPC reinforcement layer 3.
It should be noted that the reinforcing layer steel bars 8 and the corrugated pipe 9 are fixed inside the UHPC reinforcing layer 3 by Ultra High Performance Concrete (UHPC) casting, and the steel strands 7 are fixed inside the corrugated pipe 9 by cement paste or other grout casting.
According to the P-UHPC reinforcing device for the reinforced concrete structure, provided by the invention, the reinforcing layer steel bars 8 and the steel stranded wires 7 are arranged in the UHPC reinforcing layer 3, so that the internal of the reinforcing layer has pre-stress, namely the P-UHPC structure is formed, the UHPC reinforcing layer 3 and the reinforced concrete structure 1 are fixed to form an integral joint work, the original damaged reinforced concrete structure 1 obtains the pre-stress through an ultra-high performance concrete-common concrete interface, the ultra-high performance of the ultra-high performance concrete is fully exerted, the anti-cracking strength of the original damaged reinforced concrete structure 1 is effectively improved, and the anti-bending reinforcing effect is obvious; the connection of the UHPC reinforcing layer 3 and the reinforced concrete structure 1 is locally reinforced through the connecting steel bars 5, so that the shear strength and the ductility between the end part of the UHPC reinforcing layer 3 and the interface of the reinforced concrete structure 1 are improved, and the damage of the end part interface of the UHPC reinforcing layer 3 due to overlarge shear stress in the working process of the bending-resistant reinforcing structure is prevented.
As a preferred embodiment of the present invention, the UHPC reinforcing layer 3 and the reinforced concrete structure 1 are fixed by Ultra High Performance Concrete (UHPC) to form an ultra high performance concrete-common concrete interface, which has good adhesion.
Preferably, as shown in fig. 2, the end surface of the reinforced concrete structure 1 contacting the UHPC reinforcing layer 3 is a roughened surface 2, the roughened surface 2 is provided with a groove 6 and a bar planting hole 4, the UHPC reinforcing layer 3 further comprises a plurality of protruding blocks, the protruding blocks are poured and fixed in the groove 6, the orifice of the bar planting hole 4 faces the UHPC reinforcing layer 3, and one end of the connecting steel bar 5 is planted and inserted in the bar planting hole 4. The roughened surface 2 enables the tensile longitudinal rib part of the surface layer of the reinforced concrete structure 1 to be exposed, so that the bonding strength of an ultra-high performance concrete-common concrete interface can be increased, the transfer efficiency of the shear stress of the interface is improved, and the premature debonding failure of the UHPC reinforcing layer 3 under the load action after reinforcement is avoided. The arrangement of the groove 6 and the bar planting holes 4 can improve the shear strength and the ductility between the UHPC reinforcing layer 3 and the reinforced concrete structure 1, and prevent the end interface of the UHPC reinforcing layer 3 from being damaged due to overlarge shear stress in the working process of the structure. It should be noted that the size of the groove 6 may be 30mm wide and 20mm deep, the distance between the grooves 6 is 80mm, the size of the bar planting holes 4 may be 15mm diameter and 150mm deep, the distance between the bar planting holes 4 is 80mm, and the number of the grooves 6 and the bar planting holes 4 is determined by the specific engineering.
Further preferably, as shown in fig. 1, along the length direction of the UHPC reinforcing layer 3, the thickness of the middle part is thinner than that of the end part, wherein the thickness of the middle part is 50-60mm, and the thickness of the end part is 100-120mm, so that the stress of the anchoring end of the UHPC reinforcing layer 3 can be effectively prevented from being locally concentrated and pressed to crack, the volume and the weight of the UHPC reinforcing layer 3 can be reduced, and no overload load is caused on the reinforced concrete structure 1. At this time, the steel strand 7 may be a 12.7mm 1860 MPa-level low-relaxation prestressed steel strand, and the corrugated tube 9 is a customized flat corrugated tube, and may have a specific size of 20mm 30mm, and is used in cooperation with the UHPC reinforcing layer 3, so as to ensure that the concrete protective layer of the UHPC reinforcing layer 3 is not too thin and affects the structural performance.
Specifically, the UHPC reinforcing layer 3 is formed by pouring toughened ultrahigh-performance concrete, and the connecting steel bars 5 are high-strength steel bars. The toughened ultra-high performance concrete contains 2-3% of steel fiber by volume fraction, for example, the toughened ultra-high performance concrete contains 2% of end hook type (13mm) and 1% of short straight type (8mm), so that the toughness of the UHPC reinforced layer 3 can be enhanced.
As a preferred embodiment of the present invention, as shown in fig. 3, two ends of the UHPC reinforcement layer 3 in the length direction are provided with steel backing plates 10, and two ends of the steel strand 7 and the corresponding steel backing plates 10 are anchored on the UHPC reinforcement layer 3 through anchors 11, respectively, so that the UHPC reinforcement layer 3 obtains a pre-compressive stress. When the steel strand 7 is a 1860 MPa-level low-relaxation prestressed steel strand with the diameter of 12.7mm, the external diameter of the anchorage device 11 is 40mm and is matched with the steel strand 7.
It can be seen from the description of the above specific embodiment of the present invention that the P-UHPC reinforcement device for a reinforced concrete structure of the present invention employs the matching use of ultra-high performance concrete, the reinforcement layer steel bar 8, and the low-relaxation steel strand 7, so that the interior of the UHPC reinforcement layer has a pre-stress, i.e. a P-UHPC structure is formed, the mechanical properties and the durability are superior to the combination of polymer mortar and high-strength mild steel wires, the pre-stress level of the original damaged reinforced concrete structure 1 can be greatly improved, and the anti-bending reinforcement effect is obvious; the UHPC reinforcing layer 3 has pre-stress inside and is fixed with the original damaged reinforced concrete structure 1 to form integral joint work, the original damaged reinforced concrete structure 1 obtains pre-stress through an ultra-high performance concrete-common concrete interface, the ultra-high strength performance of the ultra-high performance concrete is fully exerted, and the anti-cracking strength of the original damaged reinforced concrete structure 1 is effectively improved.
In addition, in the preferred embodiment of the present invention, the roughened surface 2 of the reinforced concrete structure 1 is provided with the grooves 6 and the embedded bar structure, so that the shear strength and the ductility between the UHPC reinforcing layer 3 and the reinforced concrete structure 1 can be improved, the premature debonding failure of the ultra-high performance concrete-common concrete interface can be prevented, the local thickness of the end part of the UHPC reinforcing layer 3 is increased, and the risk of local compression cracking of the anchoring end of the reinforcing layer can be reduced.
The invention provides a construction method of a P-UHPC reinforcing device for a reinforced concrete structure, which comprises the following steps:
s1, erecting a template of the UHPC reinforcing layer 3 at the bottom of the area to be reinforced of the reinforced concrete structure 1, laying reinforcing layer steel bars 8 and corrugated pipes 9 along the length direction of the template, fixing one end of a connecting steel bar 5 at the bottom of the area to be reinforced of the reinforced concrete structure 1, and positioning the other end of the connecting steel bar in the inner cavity of the template;
s2, wetting the bottom surface of the area to be reinforced of the reinforced concrete structure 1, pouring ultra-high performance concrete in the template, curing until a UHPC reinforcing layer 3 is formed, and removing the template;
s3, penetrating steel strands 7 into the corrugated pipe 9, tensioning the steel strands 7 until stress is controlled, anchoring two ends of the steel strands 7 on the UHPC reinforcing layer 3 to enable the UHPC reinforcing layer 3 to obtain pre-stress, and enabling the reinforced concrete structure 1 to obtain pre-stress through the bonding action of an ultra-high performance concrete-common concrete interface;
and S4, injecting cement paste into the corrugated pipe 9 under pressure, spraying antirust paint on the exposed steel strand 7 to protect the steel strand 7 from rusting, and bonding the steel strand 7 and the UHPC reinforcing layer 3 into a whole to finish construction.
In step S2 of the present invention, the bottom surface of the region to be reinforced of the reinforced concrete structure 1 is sufficiently wetted, and after the ultra-high performance concrete is poured into the form, it is cured at normal temperature to a desired strength to form the UHPC reinforcing layer 3.
Preferably, step S1 further includes: the bottom surface of a region to be reinforced of a reinforced concrete structure 1 is subjected to roughening treatment to form a roughened surface 2, grooves 6 are cut on the roughened surface 2, and after bar planting holes 4 are drilled, a template of a UHPC reinforcing layer 3 is built. The roughening process exposes the longitudinal reinforcing steel bar portion by chiseling the concrete protective layer on the surface of the region to be reinforced of the reinforced concrete structure 1, forming a chiseled surface 2.
Further preferably, in step S1, by injecting the bar-planting glue into the bar-planting hole 4 and planting the connecting bar 5, one end of the connecting bar 5 is fixed at the bottom of the region to be reinforced of the reinforced concrete structure 1, and the bar-planting glue in the present invention is preferably a quick-setting bar-planting glue.
Specifically, step S3 further includes: installing steel backing plates 10 at two ends of the UHPC reinforcing layer 3 in the length direction, respectively anchoring two ends of the steel strand 7 and the corresponding steel backing plates 10 on the UHPC reinforcing layer 3 by using an anchorage device 11, and spraying antirust paint on the exposed anchorage device 11 to prevent the anchorage device 11 from being rusted.
The P-UHPC reinforcing device for the reinforced concrete structure has the advantages of short construction period, high reinforcing efficiency and light dead weight and good durability of the ultra-high performance concrete.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. The P-UHPC reinforcing device for the reinforced concrete structure is characterized by comprising an UHPC reinforcing layer (3) and connecting steel bars (5) which are fixed at the bottom of the reinforced concrete structure (1), wherein one ends of the connecting steel bars (5) are fixed in the reinforced concrete structure (1), the other ends of the connecting steel bars are fixed in the UHPC reinforcing layer (3), reinforcing layer steel bars (8) and corrugated pipes (9) are fixedly arranged in the UHPC reinforcing layer (3) in a penetrating manner along the length direction of the UHPC reinforcing layer, steel stranded wires (7) are fixedly arranged in the corrugated pipes (9) in a penetrating manner, and two ends, extending out of the corrugated pipes (9), of the steel stranded wires (7) are respectively anchored on the UHPC reinforcing layer (3).
2. The P-UHPC reinforcement apparatus for a reinforced concrete structure according to claim 1, wherein the UHPC reinforcement layer (3) is fixed to the reinforced concrete structure (1) by ultra high performance concrete casting.
3. The P-UHPC reinforcement device for a reinforced concrete structure according to claim 1, wherein the end surface of the reinforced concrete structure (1) contacting the UHPC reinforcement layer (3) is a roughened surface (2), the roughened surface (2) is provided with a groove (6) and a bar planting hole (4), the UHPC reinforcement layer (3) further comprises a plurality of protruding blocks, the protruding blocks are cast and fixed in the groove (6), the opening of the bar planting hole (4) faces the UHPC reinforcement layer (3), and one end of the connecting steel bar (5) is planted in the bar planting hole (4).
4. The P-UHPC reinforcement apparatus for a reinforced concrete structure according to claim 1, wherein the thickness of the central portion is thinner than the thickness of the end portions along the length direction of the UHPC reinforcement layer (3), wherein the thickness of the central portion is 50-60mm, and the thickness of the end portions is 100-120 mm.
5. The P-UHPC reinforcement apparatus for a reinforced concrete structure according to claim 1, wherein the UHPC reinforcement layer (3) is formed by pouring toughened ultra-high performance concrete, and the connection bars (5) are high-strength bars.
6. The P-UHPC reinforcing device for the reinforced concrete structure as claimed in claim 1, wherein steel backing plates (10) are arranged at two ends of the UHPC reinforcing layer (3) in the length direction, and two ends of the steel strand (7) and the corresponding steel backing plates (10) are anchored on the UHPC reinforcing layer (3) through anchors (11).
7. A construction method of a P-UHPC reinforcing device for a reinforced concrete structure is characterized by comprising the following steps:
s1, erecting a template of the UHPC reinforcing layer (3) at the bottom of the area to be reinforced of the reinforced concrete structure (1), laying reinforcing layer steel bars (8) and corrugated pipes (9) along the length direction of the template, fixing one end of a connecting steel bar (5) at the bottom of the area to be reinforced of the reinforced concrete structure (1), and positioning the other end of the connecting steel bar in the inner cavity of the template;
s2, wetting the bottom surface of a region to be reinforced of the reinforced concrete structure (1), pouring ultra-high performance concrete in the template, curing to form a UHPC reinforcing layer (3), and dismantling the template;
s3, penetrating steel strands (7) in the corrugated pipe (9), and anchoring two ends of the steel strands (7) on the UHPC reinforcing layer (3) after the steel strands (7) are tensioned to control stress;
s4, injecting cement paste into the corrugated pipe (9) under pressure, and spraying antirust paint on the exposed steel strand (7).
8. The construction method according to claim 7, wherein the step S1 further includes: the bottom surface of a region to be reinforced of a reinforced concrete structure (1) is subjected to roughening treatment to form a roughened surface (2), grooves (6) are cut in the roughened surface (2), rib planting holes (4) are drilled, and then a template of a UHPC reinforcing layer (3) is erected.
9. The construction method as claimed in claim 8, wherein the process of fixing one end of the connecting reinforcement (5) at the bottom of the region of the reinforced concrete structure (1) to be reinforced in step S1 comprises: and (3) injecting bar planting glue into the bar planting holes (4) and planting and inserting the connecting steel bars (5).
10. The construction method according to claim 7, wherein the step S3 further includes: and installing steel backing plates (10) at two ends of the UHPC reinforcing layer (3) in the length direction, and respectively anchoring two ends of the steel strand (7) and the corresponding steel backing plates (10) on the UHPC reinforcing layer (3) by using an anchorage device (11).
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| CN111233405A (en) * | 2020-03-23 | 2020-06-05 | 上海城建物资有限公司 | Quick-hardening type ultrahigh-performance concrete and preparation method thereof |
| CN113152897A (en) * | 2021-05-20 | 2021-07-23 | 凤冈县奇异园林景观工程有限公司 | Functional shell for cement product and preparation and use methods thereof |
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