CN210947410U - Prestressed recycled concrete hollow composite beam - Google Patents
Prestressed recycled concrete hollow composite beam Download PDFInfo
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- CN210947410U CN210947410U CN201920858940.2U CN201920858940U CN210947410U CN 210947410 U CN210947410 U CN 210947410U CN 201920858940 U CN201920858940 U CN 201920858940U CN 210947410 U CN210947410 U CN 210947410U
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Abstract
The utility model discloses a prestressing force recycled concrete is superimposed roof beam on an empty stomach, including main part roof beam (2) and edge a plurality of stirrups (3) that main part roof beam (2) axis direction set up, main part roof beam (2) form through the recycled concrete placement. The prestressed recycled concrete hollow superposed beam is beneficial to recycling of construction wastes, the construction wastes are reasonably recycled, the cost is low, energy is saved, emission is reduced, and the prestressed recycled concrete hollow superposed beam is environment-friendly.
Description
Technical Field
The utility model relates to a building structure engineering technical field especially relates to a prestressing force recycled concrete is superimposed roof beam on an empty stomach.
Background
Nowadays, the fabricated concrete structure has been widely applied abroad, and is also in a vigorous popularization stage at present in China. The superposed beam frame is a statically indeterminate structure formed by integrally connecting a concrete precast beam with a column through a post-cast superposed layer, and has the characteristics of good integrity, template and support system saving, short construction period, high benefit, environmental friendliness and the like. The superposed beam is formed by pouring and tamping concrete twice, the precast beam is made in a precast yard for the first time, the pouring and tamping are carried out in a construction site for the second time, and after the precast beam is hoisted and placed, the upper concrete is poured and tamped to connect the precast beam and the precast beam into a whole. The stress performance of the superposed beam can be divided into two types of 'one-stage stressed superposed beam' and 'two-stage stressed superposed beam'. The former means that a reliable support is arranged under a precast beam in the construction stage, so that all loads acting in the construction stage can be completely transmitted to the support; the latter is that no support is arranged under the simply supported precast beam in the construction stage, and all the construction stage is completely borne by the precast beam.
Trusses are used in a wide range of steel structures, for example, steel trusses are commonly used as the main elements of load-bearing structures in roof and crane beams, bridges, cranes, offshore production platforms for industrial and civil buildings. Various types of steel mesh frames which are more adopted in a large-span public building roof structure belong to space steel trusses. The section steel beam is made of I-shaped steel or channel steel formed by hot rolling, and the light beam such as purline can also adopt Z-shaped steel and channel steel formed by cold bending. The section steel beam is simple to process and low in manufacturing cost, but the section size of the section steel is limited by a certain specification. When the load and the span are large and the section of the adopted section steel cannot meet the requirements of strength, rigidity or stability, the combined beam is adopted. The combined beam is formed by welding or riveting steel plates or section steel. Welding is often the primary technique. The beam has higher bending rigidity and torsional rigidity, and is suitable for the conditions of higher requirements on lateral load and torsion resistance, limited beam height and the like.
In the application of large-span engineering, the prestressed reinforced concrete beam needs a very large beam section, the consumption of concrete and reinforcing steel bars is very large, the self weight of the beam is very large, and in addition, due to the characteristics of the concrete, the tension area of the prestressed reinforced concrete beam can not be fully used, namely, the prestressed reinforced concrete beam is cracked and damaged, so that the waste of the concrete is caused. The steel truss, the section steel beam and the combined beam have high structure cost and small application range and are difficult to popularize and use; and the concrete beam can not be fully utilized, so that the building resources are wasted, and the quantity of building wastes is increased.
In summary, how to effectively solve the problems of building resource waste and the like caused by the fact that the concrete beam cannot be fully utilized is a problem which needs to be solved urgently by technical personnel in the field at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a prestressing force recycled concrete is superimposed beam on an empty stomach, this prestressing force recycled concrete is superimposed beam on an empty stomach makes the reasonable cyclic utilization of building waste, reduces the building resources waste.
In order to solve the technical problem, the utility model provides a following technical scheme:
the prestressed recycled concrete hollow composite beam comprises a main beam and a plurality of stirrups arranged along the axis direction of the main beam, wherein the main beam is formed by pouring recycled concrete.
Preferably, the body beam has a cavity in a middle portion thereof.
Preferably, the bottom of the cavity has a thickness not less than 120 mm.
Preferably, the cavity is filled with gypsum or foam concrete or poured together with the floor slab.
Preferably, the main body beam is provided with at least two prestressed tendons penetrating in the axial direction.
Preferably, the tendons are disposed at four corners and side middle portions of the stirrup, and a tie bar is connected to the tendon corresponding to the side middle portions.
Preferably, the stirrups extend out of the beam surface of the main beam, and the distance between the adjacent stirrups is 100-300 mm.
The utility model provides a prestressing force recycled concrete is superposed beam on an empty stomach, including main part roof beam and a plurality of stirrup, a plurality of stirrups set up along main part roof beam axis direction, and the stirrup makes superposed beam form wholly, increases superposed beam's bulk strength. The main body beam is formed by pouring recycled concrete, the recycled concrete refers to new concrete formed by crushing, cleaning and grading waste concrete blocks, mixing the waste concrete blocks with grading according to a certain proportion, partially or completely replacing natural aggregates such as sand stones and the like, mainly coarse aggregates, and adding cement, water and the like, the waste concrete blocks are namely construction waste, in other words, the main body beam is formed by pouring the construction waste, the recycling of the construction waste is facilitated, the construction waste is reasonably recycled, the cost is lower, energy is saved, emission is reduced, and the environment is friendly.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a front view of a prestressed recycled concrete open-web composite beam.
Fig. 2 is a top view of a prestressed recycled concrete open web composite beam.
Fig. 3 is a cross-sectional view of a concave shape of the center portion of a prestressed recycled concrete hollow composite beam.
The drawings are numbered as follows:
1-cavity, 2-main body beam, 3-stirrup, 4-prestressed tendon and 5-tie tendon.
Detailed Description
The core of the utility model is to provide a prestressing force regeneration concrete superposed beam on an empty stomach, this prestressing force regeneration concrete superposed beam on an empty stomach makes the reasonable cyclic utilization of building waste, reduces the building resources waste.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1 to 3, fig. 1 is a front view of a prestressed recycled concrete hollow composite beam. Fig. 2 is a top view of a prestressed recycled concrete open web composite beam. Fig. 3 is a cross-sectional view of a concave shape of a prestressed recycled concrete hollow composite beam.
In a specific embodiment, the utility model provides a prestressing force recycled concrete is superimposed roof beam on an empty stomach, including main part roof beam 2 and a plurality of stirrups 3 that set up along 2 axis directions of main part roof beam, main part roof beam 2 forms through the recycled concrete pouring.
Among the above-mentioned structure, prestressing force recycled concrete is superposed beam on an empty stomach includes main part roof beam 2 and a plurality of stirrup 3, and a plurality of stirrups 3 set up along 2 axis directions of main part roof beam, and stirrup 3 makes superposed beam form wholly, increases superposed beam's bulk strength. The shape and structure of the body beam 2 and the stirrups 3 can refer to the shape and structure of the prior art, and further description is omitted here. Fig. 1 is a front view of a prestressed recycled concrete hollow composite beam, in which a dotted line indicates a division line of an opening position in the middle of a main beam, and the composite beam has a length of l, a height of h, and a width of b.
The main body beam 2 is formed by pouring recycled concrete, the recycled concrete refers to new concrete formed by crushing, cleaning and grading waste concrete blocks, mixing the waste concrete blocks with grading according to a certain proportion, partially or completely replacing natural aggregates such as sand stones and the like, mainly coarse aggregates, and adding cement, water and the like, the waste concrete blocks are construction waste, in other words, the main body beam 2 is formed by pouring the construction waste, and the method is beneficial to recycling the construction waste, reasonably recycling the construction waste, and has the advantages of low cost, energy conservation, emission reduction and environmental friendliness.
The prestressed recycled concrete hollow composite beam is only a preferred scheme, the technical scheme is further optimized on the basis that the end part of the composite beam is a hogging moment area, the upper end is tensioned, the lower part is compressed and has higher compression force, the upper part of the middle position is compressed and the lower part is tensioned, the upper part of the middle position is provided with a cavity 1, the lower part of the end part can be provided with a cavity, the cavity is difficult to be arranged at the lower part of the end part, the middle part of the main beam 2 is provided with the cavity 1, the middle section of the main beam is concave, the cavity 1 is arranged, and the specific shape of the cavity 1 is not limited. The cavity 1 is filled with light materials (such as gypsum, foam concrete and the like) or can be poured together with the floor slab, the self weight is small, inconvenience is caused in the construction, transportation and hoisting processes, and the construction cost is economical.
For the prestressed recycled concrete hollow composite beam in the embodiment, the thickness of the bottom of the cavity 1 is not less than 120mm, so that the strength use requirement of the middle position is met, and the beam cannot be broken.
In another more reliable embodiment, on the basis of any one of the above embodiments, the main body beam 2 is provided with at least two prestressed tendons 4 penetrating through the main body beam in the axial direction, specifically, pre-stressing the concrete, that is, manually stressing the steel tendons in the tension area of the concrete, and pre-stressing the tension area of the concrete by using the retraction force of the steel tendons. When the member bears the tensile force generated by the external load, the pre-pressure of the prestressed tendons 4 in the concrete in the tensile region is firstly counteracted, then the concrete is tensioned along with the increase of the load, and the cracks are delayed or not caused to appear. The method is commonly applied to large-span projects and adopts forms of prestressed reinforced concrete beams, steel truss structures, section steel amount, combination beams and the like.
Further optimizing the above technical scheme, the number of the prestressed tendons 4 is at least two, and the specific positions can be determined according to the actual application situation. The end part of the composite beam is a hogging moment area, the upper end of the composite beam is pulled, the lower part of the composite beam is compressed, the compression force is large, when the number of the prestressed tendons 4 is two, the prestressed tendons are preferably arranged at the corner of the lower part of the stirrup 3, the compression resistance of the end part is good, the strength is good, and the composite beam is suitable for large span. The number of the prestressed tendons 4 can also be many, for example 6, and the prestressed tendons are respectively arranged in the four corners and the middle parts of the hooping 3, the prestressed tendons 4 corresponding to the middle parts of the two sides are connected with the tie bars 5, and for the laminated beam with longer length, the prestressed tendons 4 are integrated through the tie bars 5, so that the integral strength of the prestressed tendons 4 is increased, the prestressed tendons are firm, the rigidity is increased, and the application capability in a large-span structure is improved. Of course, the concrete position of prestressing tendons 4 is unrestricted, can set for by oneself according to the difference of specific in service behavior, all is in the utility model discloses a protection range.
The utility model provides a prestressing force recycled concrete is superimposed beam on an empty stomach, under the unchangeable condition of other parts, stirrup 3 stretches out the beam surface, and adjacent stirrup 3's interval is 100 and supplyes arbitrary value between the 300mm, including endpoint value, for example for 200mm, also be exactly stirrup 3 and arrange along roof beam full length direction, and the interval is 100 and supplyes 300mm, sets up many stirrups 3 in recycled concrete, makes superimposed beam form wholly, increases the bulk strength of superimposed beam. The stirrups 3 can be uniformly distributed or non-uniformly distributed, and the specific distribution condition can be determined according to the stress condition, the strength requirement and the like.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The prestressed recycled concrete hollow composite beam provided by the utility model is introduced in detail above. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The prestressed recycled concrete hollow composite beam is characterized by comprising a main body beam (2) and a plurality of stirrups (3) arranged along the axis direction of the main body beam (2), wherein the main body beam (2) is formed by pouring recycled concrete, and at least two penetrating prestressed tendons (4) are arranged on the main body beam (2) in the axis direction.
2. The prestressed recycled concrete open web composite beam according to claim 1, wherein the central portion of said body beam (2) has a cavity (1).
3. The prestressed recycled concrete open web composite beam according to claim 2, wherein the bottom thickness of said cavity (1) is not less than 120 mm.
4. The prestressed recycled concrete open web composite beam according to claim 2, wherein said cavity (1) is filled with gypsum or foamed concrete or cast with a floor slab.
5. The prestressed recycled concrete open web composite beam according to claim 1, wherein said tendons (4) are disposed at four corners and middle portions of said stirrups (3), and tie bars (5) are connected to said tendons (4) corresponding to the middle portions of the two sides.
6. The prestressed recycled concrete open web composite beam according to claim 1, wherein said stirrups (3) extend from the beam surface of said main body beam (2), and the distance between adjacent stirrups (3) is 100-300 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201920858940.2U CN210947410U (en) | 2019-06-06 | 2019-06-06 | Prestressed recycled concrete hollow composite beam |
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| CN201920858940.2U CN210947410U (en) | 2019-06-06 | 2019-06-06 | Prestressed recycled concrete hollow composite beam |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110080461A (en) * | 2019-06-06 | 2019-08-02 | 广东工业大学 | A kind of prestressing force regeneration concrete empty stomach composite beam |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110080461A (en) * | 2019-06-06 | 2019-08-02 | 广东工业大学 | A kind of prestressing force regeneration concrete empty stomach composite beam |
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