阅读说明：本技术 一种采用预制u形ecc永久模板的钢筋混凝土复合t梁 (Reinforced concrete composite T beam adopting prefabricated U-shaped ECC permanent template ) 是由 秦凤江 朱常乐 张志刚 狄谨 黄志鹏 于 2021-07-21 设计创作，主要内容包括：本发明公开了一种采用预制U形ECC永久模板的钢筋混凝土复合T梁,属于结构工程领域领域,包括预制U形ECC永久模板、钢筋笼和混凝土,钢筋笼呈T形结构,钢筋笼的竖直部分吊装在所述预制U形ECC永久模板中,混凝土浇筑在钢筋笼中。本发明采用ECC材料预制内表面凸凹不平的U形永久模板,在施工现场直接在预制ECC永久模板内安装钢筋笼,浇筑混凝土形成T形梁,解决传统钢筋混凝土T梁运输与吊装难的问题；同时充分利用ECC材料抗拉强度高、控制裂缝性能优异的优点,解决传统钢筋混凝土T梁易开裂的问题,提高结构的开裂荷载、承载力、延性和耗能能力。(The invention discloses a reinforced concrete composite T-beam adopting a prefabricated U-shaped ECC permanent template, belonging to the field of structural engineering. The ECC material is adopted to prefabricate the U-shaped permanent formwork with the uneven inner surface, the reinforcement cage is directly installed in the prefabricated ECC permanent formwork on the construction site, and concrete is poured to form the T-shaped beam, so that the problem that the traditional reinforced concrete T-shaped beam is difficult to transport and hoist is solved; meanwhile, the advantages of high tensile strength and excellent crack control performance of the ECC material are fully utilized, the problem that the traditional reinforced concrete T beam is easy to crack is solved, and the cracking load, the bearing capacity, the ductility and the energy consumption capacity of the structure are improved.)

1. The reinforced concrete composite T beam adopting the prefabricated U-shaped ECC permanent template is characterized by comprising the prefabricated U-shaped ECC permanent template, a reinforcement cage and concrete, wherein the reinforcement cage is of a T-shaped structure, the vertical part of the reinforcement cage is hoisted in the prefabricated U-shaped ECC permanent template, and the concrete is poured in the reinforcement cage.

2. The reinforced concrete composite T-beam adopting the prefabricated U-shaped ECC permanent formwork as claimed in claim 1, wherein the reinforcement cage is a grid frame consisting of a cross beam reinforcement bracket and a longitudinal beam reinforcement bracket, and the top end of the longitudinal beam reinforcement bracket penetrates through the center position of the cross beam reinforcement bracket.

3. The reinforced concrete composite T-beam adopting the prefabricated U-shaped ECC permanent formwork as claimed in claim 2, wherein the beam steel bar support comprises a plurality of top plate longitudinal steel bars and a plurality of top plate stirrups, the top plate longitudinal steel bars are arranged in an upper layer and a lower layer, and the top plate stirrups are used for transversely hooping the top plate longitudinal steel bars from the outer side.

4. The reinforced concrete composite T-beam adopting the prefabricated U-shaped ECC permanent formwork is characterized in that the longitudinal beam steel bar support comprises a plurality of web stirrups and a plurality of web lower edge longitudinal main steel bars, the web stirrups are bent into a rectangle according to the size of a U-shaped cavity of the prefabricated U-shaped ECC permanent formwork, and the top ends of the web stirrups extend to the upper side of the top plate longitudinal steel bars.

5. The reinforced concrete composite T-beam adopting the prefabricated U-shaped ECC permanent formwork is characterized in that the top ends of two edges of the U-shaped cavity of the U-shaped ECC permanent formwork are provided with uniformly arranged notches, and the bottoms of the top plate stirrups of the beam steel bar supports are embedded in the notches.

6. The reinforced concrete composite T-beam adopting the prefabricated U-shaped ECC permanent formwork is characterized in that the inner surface of the U-shaped cavity of the prefabricated U-shaped ECC permanent formwork is provided with uniformly arranged convex-concave surfaces or convex-rib surfaces.

7. The reinforced concrete composite T-beam adopting the prefabricated U-shaped ECC permanent formwork is characterized in that temporary supports are designed among spans according to the length of the prefabricated U-shaped ECC permanent formwork when the prefabricated U-shaped ECC permanent formwork is installed.

Technical Field

The invention belongs to the field of structural engineering, and particularly relates to a reinforced concrete composite T-beam adopting a prefabricated U-shaped ECC permanent template.

Background

The reinforced concrete T-beam is widely applied to building structures and bridge structures in China by virtue of the advantages of reasonable stress, simple construction, good economy and the like. However, due to the characteristic of low tensile strength of concrete materials, the built reinforced concrete T-beam often suffers from bending or shearing cracking, and further causes the problems of corrosion of reinforcing steel bars, reduced durability and even threatened structural use safety. In addition, the existing reinforced concrete T-beam mostly adopts a prefabricated assembly construction method, a large-scale beam transporting vehicle and a large-tonnage crane are required in the construction process, and the transportation and hoisting cost is high.

ECC (engineered cementious composites) is a novel high-performance cement-based material and is prepared from raw materials such as cement, fly ash, rubber powder, quartz sand, PVA/PE fibers, a high-efficiency water reducing agent, water and the like. Compared with the common concrete material, the ECC has the tensile strain of 3-38%, which is about 300-800 times of that of the common concrete or steel fiber concrete, and the tensile process of the ECC shows the strain hardening behavior similar to that of metal; the bending tensile strength of the ECC can reach 18-30 MPa, which is about 5-8 times of that of ordinary cement concrete; meanwhile, ECC has excellent crack width control capability, the waterproof impermeability of the ECC in a cracking state is far better than that of conventional concrete, and self-healing of cracks is easier to realize.

Therefore, how to provide a reinforced concrete composite T-beam made of ECC materials is a problem to be solved by those skilled in the art.

Disclosure of Invention

In view of the above, the invention provides a reinforced concrete composite T-beam adopting a prefabricated U-shaped ECC permanent template, which can solve the problem that the traditional reinforced concrete T-beam is difficult to transport and hoist.

In order to achieve the purpose, the invention adopts the following technical scheme:

the reinforced concrete composite T beam adopting the prefabricated U-shaped ECC permanent template is characterized by comprising the prefabricated U-shaped ECC permanent template, a reinforcement cage and concrete, wherein the reinforcement cage is of a T-shaped structure, the vertical part of the reinforcement cage is hoisted in the prefabricated U-shaped ECC permanent template, and the concrete is poured in the reinforcement cage.

Furthermore, the reinforcement cage is a grid frame consisting of a cross beam reinforcement support and a longitudinal beam reinforcement support, and the top end of the longitudinal beam reinforcement support penetrates through the center position of the cross beam reinforcement support.

Furthermore, the beam steel bar support comprises a plurality of top plate longitudinal steel bars and a plurality of top plate stirrups, the top plate longitudinal steel bars are arranged in an upper layer and a lower layer, and the top plate stirrups are used for transversely hooping the top plate longitudinal steel bars from the outer side.

Furthermore, longeron steel bar support includes the vertical main reinforcing bar of a plurality of web stirrups and a plurality of web lower limb, the U-shaped chamber size of buckling for the rectangle according to prefabricated U-shaped ECC permanent mould board of abdomen stirrup, abdomen stirrup top extends the top of the vertical reinforcing bar of roof.

Furthermore, notches which are uniformly arranged are formed in the top ends of two edges of a U-shaped cavity of the U-shaped ECC permanent template, and the bottoms of the top plate stirrups of the beam steel bar support are embedded into the notches.

Further, the inner surface of the U-shaped cavity of the prefabricated U-shaped ECC permanent template is provided with convex-concave surfaces or convex-rib surfaces which are uniformly arranged.

Further, when the prefabricated U-shaped ECC permanent formwork is installed, temporary supports are designed among the spans according to the length of the prefabricated U-shaped ECC permanent formwork.

The invention has the beneficial effects that: the ECC material is adopted to prefabricate the U-shaped permanent formwork with the uneven inner surface, the reinforcement cage is directly installed in the prefabricated ECC permanent formwork on the construction site, and concrete is poured to form the T-shaped beam, so that the problem that the traditional reinforced concrete T-shaped beam is difficult to transport and hoist is solved; meanwhile, the advantages of high tensile strength and excellent crack control performance of the ECC material are fully utilized, the problem that the traditional reinforced concrete T beam is easy to crack is solved, and the cracking load, the bearing capacity, the ductility and the energy consumption capacity of the structure are improved.

Drawings

FIG. 1 is a schematic diagram of the main structure of the present invention.

Fig. 2 is a structural diagram of a prefabricated U-shaped ECC permanent formwork according to the present invention.

Fig. 3 is a schematic structural diagram of the reinforcement cage of the present invention.

Fig. 4 is a schematic structural diagram of the steel reinforcement cage hoisted into the prefabricated U-shaped ECC permanent formwork.

FIG. 5 is a schematic diagram of the final form of the present invention.

FIG. 6 is a schematic view of the inner surface of the prefabricated U-shaped ECC permanent formwork according to the present invention.

FIG. 7 is a schematic view of the inner surface of the prefabricated U-shaped ECC permanent formwork according to the present invention. The method comprises the following steps of 1-prefabricating a U-shaped ECC permanent formwork, 2-a reinforcement cage, 3-concrete, 4-web plate lower edge longitudinal main reinforcement, 5-web plate stirrups, 6-top plate longitudinal reinforcement, 7-top plate stirrups, 8-notches, 9-convex-concave surfaces and 10-convex rib surfaces.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

Examples

Referring to fig. 1-7, the invention provides a reinforced concrete composite T-beam adopting a prefabricated U-shaped ECC permanent template, which comprises a prefabricated U-shaped ECC permanent template 1, a reinforcement cage 2 and concrete 3, wherein the two works of the prefabricated U-shaped ECC permanent template 1 and the reinforcement cage 2 are simultaneously carried out in a processing plant, the construction time of the composite T-beam is shortened, the inner surface of the prefabricated U-shaped ECC permanent template 1 can adopt uniformly distributed convex-concave surfaces 9 or convex rib surfaces 10, the reinforcement cage 2 is in a T-shaped structure and is a grid frame consisting of a plurality of cross beam reinforcement supports and a plurality of longitudinal beam reinforcement supports, the top end of each longitudinal beam reinforcement support penetrates through the central position of each cross beam reinforcement support, each cross beam reinforcement support comprises a plurality of top plate longitudinal reinforcements 6 and a plurality of top plate stirrups 7, the top plate longitudinal reinforcements 6 are arranged in an upper layer and a lower layer, the top plate stirrups 7 transversely hoop reinforcements clamp the top plate longitudinal reinforcements 6 from the outer side, longeron steel bar support includes the vertical main reinforcing bar 4 of a plurality of web stirrups 5 and a plurality of web lower limb, and web stirrups 5 buckles for the rectangle according to the U-shaped chamber size of prefabricated U-shaped ECC permanent mould board 1, and the vertical main reinforcing bar 4 of web lower limb arranges in 5 base tops of web stirrups, and the vertical reinforcing bar 6 of roof and roof stirrup 7 arrange in the top of web stirrups 5.

The prefabricated U-shaped ECC permanent formwork 1 is transported to a construction site, the top ends of two edges of a U-shaped cavity of the prefabricated U-shaped ECC permanent formwork 1 are respectively provided with uniformly arranged notches 8, the prefabricated U-shaped ECC permanent formwork 1 is hoisted to an actual use position by a crane, and if the span of the prefabricated U-shaped ECC permanent formwork 1 is large, temporary supports are designed among spans according to requirements; further, hoisting the processed reinforcement cage 2, hoisting the vertical part of the reinforcement cage 2 to the inside of the prefabricated U-shaped ECC permanent formwork 1, embedding the bottom of a top plate stirrup 7 of the beam reinforcement bracket into the notch 8, erecting a formwork for pouring a top plate by relying on the prefabricated U-shaped ECC permanent formwork 1, and pouring concrete in the reinforcement cage 2 to form the reinforced concrete composite T-beam adopting the prefabricated U-shaped ECC permanent formwork.

The method can be widely applied to T-shaped beam construction, and compared with the conventional common T-shaped beam, the method can improve the bearing capacity and service performance of the structure, accelerate the construction speed and improve the construction quality; meanwhile, because the crack width of the ECC layer is extremely thin, the self-healing can be realized, the problem of corrosion of the reinforcing steel bar is thoroughly solved, the durability of the structure is improved, and the service life of the structure is prolonged. By adopting the prefabricated U-shaped ECC permanent template, the use of wood templates can be reduced in the construction of the composite T-beam, and meanwhile, the process of assembling and disassembling the template and the bracket is omitted, so that the construction progress is accelerated; in addition, standardized prefabrication construction is adopted, the construction quality of the prefabricated U-shaped ECC permanent formwork is easier to guarantee, a rugged interface is arranged on the inner surface of the prefabricated U-shaped ECC permanent formwork, the combination area of the ECC and concrete is increased, and the composite T-shaped beam can resist the shearing force and the normal stripping force of the prefabricated permanent formwork and a post-cast concrete interface by using the interface bonding force and the mechanical interlocking force of the rugged interface; when the web bears great exogenic action, mechanical interlock also can guarantee after the cohesive force became invalid that the structure does not take place brittle failure, and compound T roof beam need not the form removal after the maintenance is accomplished at the inside concrete of pouring of permanent template, can accelerate the construction progress.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the technical scope of the present invention.