Prestressed concrete superposed beam

Abstract

The invention provides a prestressed concrete superposed beam which is divided into a middle prefabricated superposed beam section and end prefabricated superposed beam sections in the length direction of the prestressed concrete superposed beam, and the end prefabricated superposed beam sections are arranged on the two sides of the middle prefabricated superposed beam section. Wherein the middle prefabricated superposed beam section is arranged to be suitable for extending into a support. According to the prestressed concrete superposed beam, the prestressed reinforcements are arranged at the bottom, so that the overall rigidity of the beam is enhanced, less supporting of the main beams and no supporting of the secondary beams and the plates can be achieved, only the prestressed reinforcements stretch out, the problem that the prefabricated beam reinforcements collide with columns and beam reinforcements during installation is avoided, and installation is easy; and the middle prefabricated superposed beam section adopts a rectangular superposed section, and the end prefabricated superposed beam sections adopt U-shaped sections, so that the cast-in-place concrete amount is reduced, and meanwhile, the self weight of the prefabricated part is reduced, and the transportation and on-site hoisting installation difficulty is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of composite beams, in particular to a prestressed concrete composite beam. BACKGROUND

[0002] The prefabricated composite beams generally adopt ordinary reinforced concrete prefabricated composite beams, prestressed reinforced concrete prefabricated composite beams, prestressed reinforced concrete steel pipe truss composite beams and the like.

[0003] However, the above-mentioned existing composite beams have the following defects:

[0004] The ordinary reinforced concrete prefabricated composite beams and the prestressed reinforced concrete prefabricated composite beams have a large self-weight, and the steel bars are prone to collision, so that the installation quality is difficult to guarantee on site;

[0005] The prestressed reinforced concrete steel pipe truss composite beam has no side plate, and the on-site construction, beam plate support, steel bar binding and concrete pouring work are large in workload, so that it is difficult to achieve the original intention of convenient and fast assembly type concrete structure.

[0006] Therefore, in order to solve the above-mentioned problems, the present application provides a prestressed concrete composite beam which can avoid steel bar collision, reduce self-weight and reduce on-site workload. SUMMARY

[0007] In order to solve the above-mentioned problems of the existing composite beams, such as the steel bars being prone to collision, affecting the installation quality, the prefabricated components having a large self-weight and the on-site construction workload being large, the present application provides a prestressed concrete composite beam.

[0008] According to one object of the present application, the present application provides a prestressed concrete composite beam, in the length direction of the prestressed concrete composite beam, the prestressed concrete composite beam is divided into a middle prefabricated composite beam section and an end prefabricated composite beam section, the end prefabricated composite beam section is arranged on both sides of the middle prefabricated composite beam section, and the prestressed concrete composite beam comprises:

[0009] a bottom plate and a steel bar cage hidden in the inner side of the bottom plate, the bottom of the steel bar cage is provided with prestressed steel bars, and in the length direction of the prestressed concrete composite beam, the end of the prestressed steel bars extends to the outer side of the bottom plate;

[0010] In the middle prefabricated composite beam section, the bottom plate has a rectangular cross section, and the steel bar cage is embedded in the inner side of the bottom plate; in the end prefabricated composite beam section, the bottom plate has a U-shaped cross section, and the steel bar cage is anchored in the inner side of the bottom plate;

[0011] The steel reinforcement cage comprises a first lower longitudinal reinforcement, the first lower longitudinal reinforcement being continuously arranged in the middle precast composite beam segment and the end precast composite beam segment, in the middle precast composite beam segment, the steel reinforcement cage further comprises a second lower longitudinal reinforcement, the second lower longitudinal reinforcement being arranged to extend into the support, and the second lower longitudinal reinforcement is provided with a detachable connection at the end of the middle precast composite beam segment.

[0012] Preferably, in the vertical direction, the steel reinforcement cage comprises the first lower longitudinal reinforcement and the second lower longitudinal reinforcement at the bottom, the waist reinforcement and the tie reinforcement at the middle, and the stirrup at the top.

[0013] The second lower longitudinal reinforcement and the bottom plate of the end precast composite beam segment are connected through a connector.

[0014] Preferably, the connector is located at the end of the rectangular cross section of the bottom plate of the end precast composite beam segment.

[0015] Preferably, the waist reinforcement of the end precast composite beam segment and the waist reinforcement of the middle precast composite beam segment are continuously arranged.

[0016] Preferably, the stirrup is a U-shaped open stirrup, the stirrups are arranged at intervals, and the stirrups are connected through a stirrup horizontal segment to form a closed stirrup.

[0017] Preferably, a shear key groove is arranged between the end face of the bottom plate of the middle precast composite beam segment and the end face of the bottom plate of the end precast composite beam segment.

[0018] Preferably, the top of the middle precast composite beam segment and the side face of the end precast composite beam segment are arranged to be connected to a precast composite slab.

[0019] Compared with the prior art, the beneficial effects of the present application are:

[0020] The prestressed concrete composite beam is provided with prestressed reinforcement at the bottom, so that the overall rigidity of the beam is strengthened, the main beam can be supported by few supports, the secondary beam and the slab can be supported without support, and only the prestressed reinforcement is extended, avoiding the problem of collision between the reinforcement of the precast beam and the reinforcement of the column and beam during installation, and facilitating installation.

[0021] The middle precast composite beam segment adopts a rectangular composite cross section, and the end precast composite beam segment adopts a U-shaped cross section, thereby reducing the amount of cast-in-place concrete, reducing the self-weight of the precast component, and reducing the difficulty of transportation and on-site lifting and installation.

[0022] The present application will be further described below in conjunction with the accompanying drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a front view schematic diagram of the prestressed concrete composite beam of the present application;

[0024] Figure 2 A reinforcement arrangement of a prestressed concrete composite beam according to the present application is shown in a front view;

[0025] Figure 3 A Figure 2 sectional view along B-B;

[0026] Figure 4 A Figure 2 sectional view along C-C;

[0027] Figure 5 A Figure 2 sectional view along E-E;

[0028] Figure 6 A Figure 2 sectional view along F-F. DETAILED DESCRIPTION

[0029] The following description is made for the purpose of fully disclosing the present application in order to enable those skilled in the art to practice the present application. The preferred embodiments are only examples of the present application and other obvious modifications are possible. The basic principles defined in the following description can be applied to other embodiments, variations, improvements, equivalents and other technical solutions without departing from the spirit and scope of the present application.

[0030] Referring to Figures 1-6 , the present application provides a technical solution: a prestressed concrete composite beam, in the length direction of the prestressed concrete composite beam, the prestressed concrete composite beam is divided into a middle prefabricated composite beam section 100 and an end prefabricated composite beam section 200, the end prefabricated composite beam section 200 is arranged on both sides of the middle prefabricated composite beam section 100, and the prestressed concrete composite beam comprises:

[0031] a bottom plate 300 and a steel cage 400 hidden inside the bottom plate 300, the bottom of the steel cage 400 is provided with prestressed steel bars 500, and in the length direction of the prestressed concrete composite beam, the end of the prestressed steel bars 500 extends to the outside of the bottom plate 300;

[0032] In the middle prefabricated composite beam section 100, the bottom plate 300 is rectangular section, the reinforcement cage 400 is embedded in the inner side of the bottom plate 300, in the end prefabricated composite beam section 200, the bottom plate 300 is U-shaped section, the reinforcement cage 400 is anchored in the inner side of the bottom plate 300, the reinforcement cage 400 includes lower longitudinal reinforcement one 405, the lower longitudinal reinforcement one 405 in the middle prefabricated composite beam section 100 and the end prefabricated composite beam section 200 is continuously arranged, in the middle prefabricated composite beam section 100, the reinforcement cage 400 further includes lower longitudinal reinforcement two 401, the lower longitudinal reinforcement two 401 is arranged to extend into the support, and the lower longitudinal reinforcement two 401 is arranged to be detachably connected at the end of the middle prefabricated composite beam section 100.

[0033] The prestressed concrete composite beam is provided with prestressed reinforcement 500 at the bottom, so that the overall rigidity of the beam is strengthened, the main beam can be supported by few supports, the secondary beam and the plate can be supported without support, and only the prestressed reinforcement 500 is extended, so that the problem of collision between the reinforcement of the prefabricated beam and the column and beam reinforcement during installation is avoided, and the installation is easy;

[0034] The middle prefabricated composite beam section 100 adopts a rectangular composite section, and the end prefabricated composite beam section 200 adopts a U-shaped section, so that the amount of site-poured concrete is reduced, the self-weight of the prefabricated component is reduced, and the difficulty of transportation and site lifting and installation is reduced. The self-weight of the prestressed concrete composite beam is 60% to 70% of that of a conventional prefabricated beam. In addition, the reinforcement cage 400 of the end prefabricated composite beam section 200 is prefabricated in the bottom plate 300 of the U-shaped section, which does not affect the site installation. The reinforcement cage 400 of the middle prefabricated composite beam section 100 is placed above the bottom plate 300 of the rectangular section. The reinforcement cage 400 of the end prefabricated composite beam section 200 and the reinforcement cage 400 of the end prefabricated composite beam section 200 are detachably connected. The site lengthening reinforcement extends into the support, and the reserved length is beneficial to the on-site position adjustment of the reinforcement.

[0035] Specifically, in the vertical direction, the reinforcement cage 400 includes the lower longitudinal reinforcement one 405 and the lower longitudinal reinforcement two 401 at the bottom, the waist reinforcement 402 and the tie reinforcement 403 at the middle, and the stirrup 404 at the top;

[0036] The lower longitudinal reinforcement one 405 is arranged close to the bottom of the U-shaped section of the end prefabricated composite beam section 200, and the lower longitudinal reinforcement two 401 is arranged above the lower longitudinal reinforcement one 405. In the horizontal direction, the lower longitudinal reinforcement two 401 and the lower longitudinal reinforcement one 405 are both arranged with two. The lower longitudinal reinforcement one 405 corresponds to the two corner portions of the end prefabricated composite beam section 200, and the lower longitudinal reinforcement two 401 is located on the opposite inner side of the lower longitudinal reinforcement one 405, so as to improve the stability of the connection between the two composite beam sections.

[0037] The lower longitudinal reinforcement 401 of the end precast composite beam segment 200 and the bottom plate 300 are connected by a connector 600, wherein the connector 600 is located at the end of the bottom plate 300 of the end precast composite beam segment 200, the reinforcement is extended into the support, and the reserved length is used for adjusting the position of the reinforcement on site;

[0038] The waist reinforcement 402 of the end precast composite beam segment 200 and the waist reinforcement 402 of the middle precast composite beam segment 100 are continuously arranged.

[0039] The stirrup 404 is a U-shaped open stirrup 404, and the stirrups 404 are arranged at a relative interval and connected by a stirrup horizontal section to form a closed stirrup.

[0040] The reinforcement in the precast beam includes the bottom pre-stressed reinforcement 500, the lower longitudinal reinforcement one of the reinforcement cage 400 in the middle precast composite beam segment 100, the lower longitudinal reinforcement one of the reinforcement cage 400 in the end precast composite beam segment 200, the ordinary reinforcement, the waist reinforcement 402, the tendon 403, and the U-shaped open stirrup 404. The reinforcement installed later includes the upper beam reinforcement, the lower longitudinal reinforcement two 401 connected with the bottom plate 300 of the end precast composite beam segment 200 by the connector, the stirrup horizontal section connected with the open stirrup 404 to form a closed stirrup, and the waist reinforcement 402 of the end precast composite beam segment 200 connected with the embedded waist reinforcement 402 of the middle precast composite beam segment 100. The on-site reinforcement binding mainly includes the upper beam reinforcement and the top stirrup 404, and the on-site reinforcement workload is small.

[0041] To solve the problem that the shear bearing capacity of the vertical joint at the end of the existing composite beam is weak, the additional reinforcement is more, and the installation and construction difficulty is increased, further, the shear key groove 301 is arranged between the end face of the bottom plate 300 of the middle precast composite beam segment 100 and the end face of the bottom plate 300 of the end precast composite beam segment 200, so that the shear bearing capacity of the vertical joint at the end of the beam is strong, the weak part of the cast-in-place and precast vertical joint is transferred to the beam span 1 / 3 area with smaller shear force, the stress requirement is easy to meet, and the shear requirement is met.

[0042] Further, the top of the middle precast composite beam segment 100 and the side face of the end precast composite beam segment 200 are provided to be suitable for connecting the precast composite slab, so as to achieve the effect of free side form and reduce the on-site formwork workload, wherein the bottom plate 300 of the end precast composite beam segment 200 includes a side plate part and a bottom plate part, the side plate part is arranged at two opposite sides of the bottom plate part to form a U-shaped cross section, and the side plate part is provided to be suitable for being connected with the precast composite slab.

[0043] The prestressed concrete composite beam further includes a lifting bolt 700 arranged in the bottom plate 300 of the middle precast composite beam segment 100.

[0044] The prestressed concrete composite beam, the rectangular section middle prefabricated composite beam section 100 and the two end U-shaped section end prefabricated composite beam section 200, are suitable for different span prefabricated beams, the beam section width is greater than or equal to 300, and the height is greater than or equal to 400.

[0045] In summary, the prestressed concrete composite beam can improve the work efficiency of on-site construction, make the assembly type concrete structure construction more convenient, speed up the construction progress, guarantee the construction safety, solve the problems of steel bar collision and joint connection strength, and guarantee the construction quality and quality safety requirements.

[0046] The above-described embodiments are only used to illustrate the technical ideas and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and cannot be limited to the patent application range of the present application only by the above-described embodiments, that is, any equivalent changes or modifications made according to the disclosed spirit of the present application still fall within the patent scope of the present application.

Claims

1. A prestressed concrete composite beam, characterized by, In the length direction of the prestressed concrete composite beam, the prestressed concrete composite beam is divided into a middle prefabricated composite beam section (100) and an end prefabricated composite beam section (200), the end prefabricated composite beam section (200) is arranged on both sides of the middle prefabricated composite beam section (100), and the prestressed concrete composite beam comprises: a bottom plate (300) and a reinforcement cage (400) hidden inside the bottom plate (300), the bottom of the reinforcement cage (400) is provided with prestressed reinforcement (500), and the end of the prestressed reinforcement (500) extends to the outside of the bottom plate (300) in the length direction of the prestressed concrete composite beam; in the middle prefabricated composite beam section (100), the bottom plate (300) is of a rectangular cross section, and the reinforcement cage (400) is embedded in the inside of the bottom plate (300); in the end prefabricated composite beam section (200), the bottom plate (300) is of a U-shaped cross section, and the reinforcement cage (400) is anchored in the inside of the bottom plate (300); the reinforcement cage (400) comprises lower longitudinal reinforcement one (405), the lower longitudinal reinforcement one (405) in the middle prefabricated composite beam section (100) and the end prefabricated composite beam section (200) is arranged continuously, the reinforcement cage (400) further comprises lower longitudinal reinforcement two (401) in the middle prefabricated composite beam section (100), the lower longitudinal reinforcement two (401) is arranged to extend into a support, and the lower longitudinal reinforcement two (401) is provided with detachable connections at the ends of the middle prefabricated composite beam section (100).

2. The prestressed concrete composite beam according to claim 1, characterized in that, In the vertical direction, the reinforcement cage (400) comprises the lower longitudinal reinforcement one (405) and the lower longitudinal reinforcement two (401) at the bottom, waist reinforcement (402) and tension reinforcement (403) at the middle, and stirrups (404) at the top; the lower longitudinal reinforcement two (401) and the bottom plate (300) of the end prefabricated composite beam section (200) are connected through a connector (600).

3. The prestressed concrete composite beam according to claim 2, characterized in that, The connector (600) is located at the end of the rectangular cross section of the bottom plate (300) of the end prefabricated composite beam section (200).

4. The prestressed concrete composite beam according to claim 2, wherein The waist reinforcement (402) of the end prefabricated composite beam section (200) and the waist reinforcement (402) of the middle prefabricated composite beam section (100) are arranged continuously.

5. The prestressed concrete composite beam according to claim 2, wherein The stirrups (404) are U-shaped open stirrups (404), the stirrups (404) are arranged at a relative interval, and the stirrups (404) are connected through stirrup horizontal sections to form a closed hoop.

6. The prestressed concrete composite beam according to claim 1, wherein A shear key groove (301) is arranged between the end face of the bottom plate (300) of the middle prefabricated composite beam section (100) and the end face of the bottom plate (300) of the end prefabricated composite beam section (200).

7. The prestressed concrete composite beam according to claim 1, wherein The top of the middle prefabricated composite beam section (100) and the side face of the end prefabricated composite beam section (200) are arranged to be suitable for connecting a prefabricated composite slab.

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