CN218643674U

CN218643674U - Reinforced concrete rectangular beam containing FRP grid reinforced UHPC permanent formwork

Info

Publication number: CN218643674U
Application number: CN202221565290.0U
Authority: CN
Inventors: 李倍安; 李士东; 刘宪林
Original assignee: Guangxi Xinxiang Expressway Co ltd
Current assignee: Guangxi Xinxiang Expressway Co ltd
Priority date: 2022-06-22
Filing date: 2022-06-22
Publication date: 2023-03-17
Anticipated expiration: 2032-06-22

Abstract

The utility model discloses a reinforced concrete rectangular beam containing FRP grid reinforced UHPC permanent formwork shell, which comprises a UHPC permanent formwork shell layer (1) and a reinforced concrete core (2), wherein the reinforced concrete core (2) is arranged inside the UHPC permanent formwork shell layer (1); the UHPC permanent mold shell layer (1) consists of an UHPC outer template (101) and an FRP grid layer (102), wherein the FRP grid layer (102) is embedded in the UHPC outer template (101); the reinforced concrete core (2) is composed of a concrete beam (201), longitudinal steel bars (202) and transverse stirrups (203), and the longitudinal steel bars (202) and the transverse stirrups (203) are buried inside the concrete beam (201).

Description

Reinforced concrete rectangular beam containing FRP grid reinforced UHPC permanent formwork

Technical Field

The utility model relates to a bridge technical field, in particular to reinforced concrete rectangular beam who contains FRP net reinforcing UHPC permanent mould shell.

Background

The roof beam is that building structure bears the important component of vertical and horizontal load, and traditional reinforced concrete roof beam has the low, easy corrosion of ratio of strength to weight, ductility difference and the not enough problem of power consumption, and the roof beam often needs the formwork when making moreover, and formwork turnover rate is extremely low, and this not only leads to extravagant resource, still the progress of greatly reduced construction. The presence of a permanent UHPC formwork reinforced by FRP grids makes it possible to completely solve the above problems. The FRP grid reinforced UHPC permanent membrane shell not only can be used as a construction template of a beam, but also can increase the density and toughness of the interior of a composite beam. Meanwhile, by utilizing the characteristics of light weight, high strength, durability and corrosion resistance of FRP and the mechanical characteristics of high strength, good ductility and excellent impermeability of UHPC, the bearing capacity, rigidity and durability of the composite beam can be improved, and the FRP grid strengthens the constraint of the UHPC permanent membrane shell on the beam, thereby achieving the purposes of crack control, structural safety and reliability of the composite beam.

The terminology used is:

FRP: a Fiber Reinforced Polymer (FRP) is a composite material formed by winding and extruding fibers and a matrix material. The FRP includes Carbon Fiber (CFRP), glass Fiber (GFRP), aramid Fiber (AFRP) or Basalt Fiber (BFRP). The composite material has the characteristics of high specific strength, large specific modulus, and good corrosion resistance and durability.

UHPC: ultra-high Performance Concrete (UHPC for short) is an Ultra-high Performance fiber reinforced cement composite material with Ultra-high strength, high ductility and Ultra-high durability, and is mainly obtained by improving the fineness and activity of components and improving the compactness of the material.

SUMMERY OF THE UTILITY MODEL

The utility model discloses solve the not enough problem of durability of current preparation roof beam cycle length and roof beam and provide a reinforced concrete rectangular beam who bears the weight of the permanent membrane shell of FRP net reinforcing UHPC that dynamic height, durability are good, anti-crack ability reinforce, the construction is simple and convenient and with low costs. In order to solve the above problem, the utility model provides a technical scheme as follows:

the utility model discloses a reinforced concrete rectangular beam that contains FRP net reinforcing UHPC permanent mould shell, reinforced concrete rectangular beam includes UHPC permanent mould shell and reinforced concrete kernel, the reinforced concrete kernel set up in UHPC permanent mould shell is inside; the UHPC permanent formwork shell layer consists of an UHPC outer formwork and an FRP grid layer, and the FRP grid layer is buried inside the UHPC outer formwork; the reinforced concrete inner core is composed of a concrete beam, longitudinal steel bars and transverse stirrups, and the longitudinal steel bars and the transverse stirrups are buried inside the concrete beam.

Furthermore, each panel of the UHPC permanent formwork shell layer is of a rectangular structure, the UHPC outer formwork is poured around the FRP grid layer to form an integral structure, and each panel is prefabricated and formed respectively and then is assembled into a rectangular groove structure to serve as the permanent formwork shell layer of the reinforced concrete rectangular beam.

Furthermore, the longitudinal steel bars and the transverse stirrups are bundled or welded to form a steel reinforcement cage, the steel reinforcement cage is placed in the UHPC permanent formwork layer to be preset, and then the concrete beam is poured to form the reinforced concrete core.

Furthermore, the longitudinal steel bars are provided with 4-8 longitudinal steel bars, the 4-8 longitudinal steel bars are arranged in or outside the transverse stirrup rings, the longitudinal steel bars and the transverse stirrups form a steel bar cage of an integral structure through steel wire bundling or welding, the distance between every two adjacent transverse stirrups is 8cm-20cm, and the distance between every two adjacent longitudinal steel bars is 8cm-40cm.

Furthermore, the thickness of the UHPC outer template is 3cm-5cm, and the FRP grid layer is positioned at the position of 1/3-1/2 of the outer wall of the UHPC outer template.

The utility model provides a reinforced concrete rectangular beam who contains FRP net reinforcing UHPC permanent mould shell's beneficial effect is:

1. the utility model discloses the manufacturing process of roof beam compares with the manufacturing process of traditional roof beam, and the manufacturing process of this novel roof beam can reduce the template and prop up the recruitment volume of tearing open for the progress of construction reduces construction cost.

2. The utility model discloses a FRP net reinforcing UHPC permanent mould shell is prefabricated in advance, therefore this combination beam both can be at the mill prefabrication, also can be with prefabricated UHPC permanent mould shell hoist and mount the back cast in situ concrete that takes one's place at the job site and form.

3. The utility model discloses the roof beam is compared with traditional roof beam, and this novel combination roof beam can improve the brittle failure characteristic of component.

4. Due to the reinforcing effect of the FRP grids, the shearing resistance of the composite beam is effectively improved. Because the outermost layer also has UHPC, the combined beam has good ductility and earthquake resistance. The concrete is poured into the UHPC permanent formwork shell layer reinforced by the prefabricated FRP grid, so that the construction speed can be accelerated, the construction quality can be improved, the cost can be saved, and the requirement of building assembly is met.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained without creative efforts.

FIG. 1 is a schematic view of a sectional structure of a reinforced concrete rectangular beam according to the present invention;

FIG. 2 is a schematic view of the cross-sectional structure of the reinforced concrete rectangular beam of the present invention.

The figures are labeled as follows:

1-UHPC permanent mould shell layer; 2-reinforced concrete inner core; 101-UHPC external template; 102-FRP grid layer; 201-concrete beam; 202-longitudinal steel bars; 203-transverse stirrups.

Detailed Description

In order to make the technical solution in the embodiments of the present invention better understood and make the above objects, features and advantages of the present invention more obvious and understandable, the following description of the embodiments of the present invention is provided with reference to the accompanying drawings.

It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features related to the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Referring to fig. 1 and 2, the reinforced concrete rectangular beam with the FRP mesh reinforced UHPC permanent formwork of the present embodiment includes a UHPC permanent formwork shell layer 1 and a reinforced concrete core 2, wherein the reinforced concrete core 2 is disposed inside the UHPC permanent formwork shell layer 1; the UHPC permanent mold shell layer 1 consists of an UHPC outer template 101 and an FRP grid layer 102, and the FRP grid layer 102 is embedded inside the UHPC outer template 101; the reinforced concrete core 2 is composed of a concrete beam 201, longitudinal steel bars 202 and transverse stirrups 203, and the longitudinal steel bars 202 and the transverse stirrups 203 are buried inside the concrete beam 201.

As a preferred embodiment, each panel of the UHPC permanent mold shell layer 1 is of a rectangular structure, the UHPC outer formwork 101 is poured around the FRP grid layer 102 to form an integral structure, and each panel is prefabricated and assembled into a rectangular groove structure after being respectively formed to serve as the permanent mold shell layer of the reinforced concrete rectangular beam.

Preferably, the longitudinal steel bars 202 and the transverse stirrups 203 form a steel reinforcement cage through bundling or welding, the steel reinforcement cage is placed in a predetermined position in the UHPC permanent mold shell layer 1, and then the concrete beam 201 is poured to form the reinforced concrete core 2.

Preferably, the longitudinal steel bars 202 have 4-8 longitudinal steel bars 202, the 4-8 longitudinal steel bars 202 are arranged in or out of the ring of the transverse stirrups 203, the longitudinal steel bars 202 and the transverse stirrups 203 form a steel reinforcement cage of an integral structure through steel wire bundling or welding, the distance between two adjacent transverse stirrups 203 is 8cm-20cm, and the distance between two adjacent longitudinal steel bars 202 is 8cm-40cm.

Preferably, the thickness of the UHPC outer template 101 is 3cm-5cm, and the FRP grid layer 102 is positioned at the position of 1/3-1/2 of the outer wall of the UHPC outer template 101.

The FRP mesh layer 102 is an integral mesh formed by impregnating CFRP, GFRP, BFRP or AFRP in epoxy resin with good corrosion resistance, fixing the impregnated FRP bundle layer by layer in a criss-cross manner, and then extruding. The UHPC external template 101 is mainly formed by solidifying cement, silica fume, a water reducing agent, steel fiber, clean water and other materials in a specific template, when pouring, firstly, the manufactured FRP grid is placed in the specific template, then, the position of the FRP grid is fixed, then, the UHPC is slowly poured, vibrated, the surface of the template is flattened, and finally, film covering and maintenance are carried out.

The model of the longitudinal steel bar 202 is HRB300 steel bar, HRB335 steel bar, HRB400 steel bar or HRB500 steel bar. The transverse stirrup 203 is HRB300 stirrup, HRB335 stirrup, HRB400 stirrup or HRB500 stirrup. The size and dimension of the UHPC permanent mould shell layer 1 and the dosage of the FRP grid layer 102, the longitudinal steel bars 202 and the transverse stirrups 203 are determined according to actual engineering.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments.

The embodiments of the present invention are described in detail with reference to the drawings, but the present invention is not limited to the described embodiments. Various changes, modifications, substitutions and alterations to these embodiments will be apparent to those skilled in the art without departing from the principles and spirit of the invention.

Claims

1. A reinforced concrete rectangular beam containing an FRP grid reinforced UHPC permanent formwork is characterized by comprising an UHPC permanent formwork shell layer (1) and a reinforced concrete core (2), wherein the reinforced concrete core (2) is arranged inside the UHPC permanent formwork shell layer (1);

the UHPC permanent mold shell layer (1) consists of an UHPC outer template (101) and an FRP grid layer (102), wherein the FRP grid layer (102) is embedded in the UHPC outer template (101); the reinforced concrete core (2) is composed of a concrete beam (201), longitudinal steel bars (202) and transverse stirrups (203), and the longitudinal steel bars (202) and the transverse stirrups (203) are buried inside the concrete beam (201).

2. The rectangular reinforced concrete beam containing the FRP grid reinforced UHPC permanent formwork shell as claimed in claim 1, wherein each panel of the UHPC permanent formwork shell layer (1) is of a rectangular structure, the UHPC outer formwork (101) is poured around the FRP grid layer (102) to form an integral structure, and each panel is prefabricated and formed respectively and then spliced into a rectangular groove structure to serve as the permanent formwork shell layer of the rectangular reinforced concrete beam.

3. The rectangular reinforced concrete beam with the FRP grid reinforced UHPC permanent formwork as claimed in claim 2, wherein the longitudinal steel bars (202) and the transverse stirrups (203) form a reinforcement cage by bundling or welding, the reinforcement cage is placed in a preset position in the UHPC permanent formwork shell layer (1), and then the concrete beam (201) is poured to form the reinforced concrete inner core (2).

4. Rectangular reinforced concrete beam comprising an FRP grid reinforced UHPC permanent formwork according to claim 3, characterized in that the longitudinal reinforcement bars (202) have 4-8, 4-8 longitudinal reinforcement bars (202) are arranged in or out of the ring of the transversal stirrup (203), a reinforcement cage is formed by the longitudinal reinforcement bars (202) and the transversal stirrup (203) into an integral structure through steel wire tying or welding, the distance between two adjacent transversal stirrups (203) is 8-20 cm, and the distance between two adjacent longitudinal reinforcement bars (202) is 8-40 cm.

5. The rectangular reinforced concrete beam containing the FRP grid reinforced UHPC permanent formwork of claim 4 is characterized in that the thickness of the UHPC outer formwork (101) is 3cm-5cm, and the FRP grid layer (102) is positioned at the position of 1/3-1/2 of the outer wall of the UHPC outer formwork (101).