CN212001215U

CN212001215U - Prefabricated raft board

Info

Publication number: CN212001215U
Application number: CN201922215498.4U
Authority: CN
Inventors: 杨节
Original assignee: Xuancheng Municipal Construction Group Co ltd
Current assignee: Xuancheng Municipal Construction Group Co ltd
Priority date: 2019-12-11
Filing date: 2019-12-11
Publication date: 2020-11-24
Anticipated expiration: 2029-12-11

Abstract

The utility model provides a prefabricated raft board, which comprises a bottom board, a post-cast strip and an overhanging reinforcing steel bar; the number of the bottom plates is two, the post-cast strip is arranged between the two bottom plates, and one side of each bottom plate, which is far away from the post-cast strip, is provided with an overhanging steel bar; a plurality of reinforcing steel bars are arranged at the joint of the bottom plate and the post-cast strip, and the reinforcing steel bars are arranged in a crossed manner and connected with the steel bars on the post-cast strip; the utility model has the advantages that: the bottom plate, the post-cast strip and the overhanging reinforcing steel bars are integrally cast, the bottom plate part is made of reinforced concrete, and the reinforcing steel bars are arranged at the joint of the bottom plate and the post-cast strip and used for enhancing the strength of the joint; the reinforcing steel bars are arranged in a crossed mode and connected with the steel bars on the post-cast strip, integrity of the bottom plate, the reinforcing steel bars and the post-cast strip is guaranteed, and cracks are not prone to occurring in the later period.

Description

Prefabricated raft board

Technical Field

The utility model relates to a concrete construction technical field especially relates to a prefabricated raft board.

Background

Raft board, a concrete slab in the foundation engineering, the foundation is under the board, and the column, wall, etc. are arranged on the board. It is also called a raft board since it floats on the soil. The foundation type adopted by the building is closely related to the type of foundation soil and the distribution condition of soil layers. In engineering design, the geological conditions are often encountered, and the rock-soil layers under the basement bottom plate are weathered residual soil layers, completely weathered rock layers, strongly weathered rock layers or weathered soft rock layers, so that a natural foundation is possibly adopted as a building foundation. The basement of the high-rise building is usually used as an underground parking garage, and excessive inner walls are not allowed to be arranged on the building, so that the use of box type foundations is limited; the raft foundation can not only give full play to the bearing capacity of the foundation and adjust the uneven settlement, but also meet the space use requirement of the parking garage, thereby becoming a more ideal foundation type. The main construction types of the raft foundation are a flat-plate type raft foundation and a beam-plate type raft foundation, and the flat-plate type raft foundation is widely applied to high-rise buildings due to simple construction; the building load is great, and the foundation bearing capacity is weaker, often adopts the concrete bottom plate, bears the building load, forms raft foundation, and its wholeness is good, can be fine resist building differential settlement.

In many times, the raft is not very convenient when the building site is under construction, and prefabricated formula raft is all adopted in many places, does not make the raft major structure in mill and transports to the building site again for the construction rhythm is saved engineering time.

However, the integrity between the main body of the prefabricated raft and the concrete poured behind the post-cast strip is not very good, cracks are easy to appear, and the performance of the whole raft is affected.

SUMMERY OF THE UTILITY MODEL

The utility model provides a prefabricated raft board to the not enough of prior art.

The utility model discloses a following technical means realizes solving above-mentioned technical problem:

a prefabricated raft comprises a bottom plate, a post-cast strip and an overhanging steel bar; the number of the bottom plates is two, the post-cast strip is arranged between the two bottom plates, and one side of each bottom plate, which is far away from the post-cast strip, is provided with an overhanging steel bar; the bottom plate is provided with a plurality of reinforcing steel bars at the joint with the post-cast strip, and the reinforcing steel bars are arranged in a crossed manner and connected with the reinforcing steel bars on the post-cast strip.

As an improvement of the technical scheme, a concave part is arranged at the joint of the bottom plate and the post-cast strip.

As an improvement of the above technical solution, a convex portion is provided in the middle of the concave portion, and the crossing portion of the reinforcing steel bar is provided in the convex portion.

As an improvement of the above technical solution, the surfaces of the concave portion and the convex portion are provided with unevenness.

As an improvement of the technical scheme, the post-cast strip comprises longitudinal steel bars and stirrups; the longitudinal steel bars and the overhanging steel bars are arranged into a whole and are integrally cast and molded with the bottom plate; and the longitudinal steel bars are bound and connected with the stirrups.

The utility model has the advantages that: the bottom plate, the post-cast strip and the overhanging reinforcing steel bars are integrally cast, the bottom plate part is made of reinforced concrete, and the reinforcing steel bars are arranged at the joint of the bottom plate and the post-cast strip and used for enhancing the strength of the joint; the reinforcing steel bars are arranged in a crossed mode and connected with the steel bars on the post-cast strip, integrity of the bottom plate, the reinforcing steel bars and the post-cast strip is guaranteed, and cracks are not prone to occurring in the later period.

Drawings

Fig. 1 is a schematic structural view of a prefabricated raft in an embodiment of the present invention;

FIG. 2 is a schematic view of the cross-sectional structure A-A of FIG. 1;

fig. 3 is a schematic structural view of a convex portion in the concave portion according to an embodiment of the present invention;

the steel plate comprises a bottom plate 1, a post-cast strip 2, an overhanging steel bar 3, a reinforcing steel bar 11, a concave part 12 and a convex part 13.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Examples

As shown in fig. 1 and 2, the prefabricated raft according to the embodiment includes a bottom plate 1, a post-cast strip 2, and an overhanging reinforcement bar 3; the number of the bottom plates 1 is two, the post-cast strip 2 is arranged between the two bottom plates 1, and one side of each bottom plate 1, which is far away from the post-cast strip 2, is provided with an overhanging steel bar 3; the bottom plate 1 is provided with a plurality of reinforcing steel bars 11 with the postcast strip 2 junction, cross arrangement and with the steel bar connection on the postcast strip 2 between the reinforcing steel bar 11.

The bottom plate 1, the post-cast strip 2 and the overhanging reinforcing steel bars 3 are integrally cast, the bottom plate 1 is partially made of reinforced concrete, and the reinforcing steel bars 11 are arranged at the joint of the bottom plate 1 and the post-cast strip 2 and used for enhancing the strength of the joint, because the post-cast strip 2 is cast with concrete at the later stage, strength gaps are easy to occur, and the strength is insufficient at the joint; reinforcing steel bar 11 is crossed between the setting and with the steel bar connection on the post-cast strip 2 guarantee bottom plate 1, reinforcing steel bar 11 and post-cast strip 2's wholeness, the difficult crackle that appears in later stage.

As shown in fig. 2, a concave part 12 is arranged at the joint of the bottom plate 1 and the post-cast strip 2; set up in sunken part 12 can be in 2 later stages of post-cast strip cast concrete extend to sunken part 12, make bottom plate 1, reinforcing bar 11 and the concrete that pours become the wholeness, the difficult fracture in later stage.

As shown in fig. 3, a convex portion 13 is provided in the middle of the concave portion 12, and the crossing portion of the reinforcing bars 11 is provided in the convex portion 13; the cross points and two ends of the reinforcing steel bars 11 are integrally cast and formed with the bottom plate 1, so that the reinforcing steel bars are not easy to bend after the post-cast strip 2 is poured with concrete at the later stage, a shaping effect is achieved, and cracks are prevented from being generated between the post-poured concrete and the bottom plate; the post-poured concrete should be a compensating shrinkage concrete of one level stronger than the concrete used for the bottom plate 1.

The surfaces of the concave part 12 and the convex part 13 are arranged to be uneven; the tightness between the bottom plate 1 and the back poured concrete is increased, and cracks are prevented.

The post-cast strip 2 comprises longitudinal steel bars and stirrups; the longitudinal steel bars and the overhanging steel bars 3 are arranged into a whole and are integrally cast and molded with the bottom plate 1; the longitudinal steel bars are bound and connected with the stirrups; the integrity of the post-cast strip 2 is strengthened, and the part is prevented from cracking when receiving force vertical to the direction of the longitudinal steel bar after the concrete is poured in later period.

It is noted that, in this document, relational terms such as first and second, and the like, if any, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A prefabricated raft board, its characterized in that: comprises a bottom plate (1), a post-cast strip (2) and an overhanging reinforcing steel bar (3); the two bottom plates (1) are arranged, the post-cast strip (2) is arranged between the two bottom plates (1), and one side, far away from the post-cast strip (2), of each bottom plate (1) is provided with an outward extending reinforcing steel bar (3); the bottom plate (1) is provided with a plurality of reinforcing steel bars (11) with post-cast strip (2) junction, cross arrangement and with the steel bar connection on the post-cast strip (2) between reinforcing steel bar (11).

2. A prefabricated raft according to claim 1, wherein: and a concave part (12) is arranged at the joint of the bottom plate (1) and the post-cast strip (2).

3. A prefabricated raft according to claim 2, wherein: a convex part (13) is arranged in the middle of the concave part (12), and the cross part of the reinforcing steel bar (11) is arranged in the convex part (13).

4. A prefabricated raft according to claim 3, wherein: the surfaces of the concave part (12) and the convex part (13) are arranged to be uneven.

5. A prefabricated raft according to claim 1, wherein: the post-cast strip comprises longitudinal steel bars and stirrups; the longitudinal steel bars and the overhanging steel bars (3) are arranged into a whole and are integrally cast with the bottom plate (1); and the longitudinal steel bars are bound and connected with the stirrups.