CN209779987U

CN209779987U - one-way superimposed sheet bottom plate of piece pre-compaction

Info

Publication number: CN209779987U
Application number: CN201920064570.5U
Authority: CN
Inventors: 李本悦; 张明山; 樊启广; 夏亮; 陈可鹏; 杨嘉胤; 洪涛; 陈敏伟
Original assignee: Architectural Design and Research Institute of Zhejiang University Co Ltd
Current assignee: Architectural Design and Research Institute of Zhejiang University Co Ltd
Priority date: 2019-01-15
Filing date: 2019-01-15
Publication date: 2019-12-13
Anticipated expiration: 2029-01-15

Abstract

The utility model discloses an one-way superimposed sheet bottom plate of piece pre-compaction, one section post-cast recess is left at one section distance at every interval in the piece junction of one-way superimposed sheet bottom plate, exposes the connecting reinforcement end in the post-cast recess, and the end should carry out screw thread machining in advance. After the one-way laminated slab base plates are manufactured in a factory, the one-way laminated slab base plates are transported to a site and lifted in place, the grooves of two laminated slab base plates needing to be connected by the abutted seams are aligned, the connecting steel bars in the grooves are also aligned, a steel bar connector with a prestress applying function is placed in each groove, tension is applied to the steel bars while the steel bars are connected, pre-pressure can be generated in concrete at the abutted seams by the tension, the pre-pressure can ensure that the abutted seams can be kept in a pressed state in the later use process, and the abutted seams are prevented from cracking. And pouring the post-cast concrete in the groove and the cast-in-place concrete on the upper part of the laminated slab together to finally form the one-way laminated slab capable of bearing load.

Description

One-way superimposed sheet bottom plate of piece pre-compaction

Technical Field

the utility model belongs to the technical field of building industrialization's design and construction, especially, relate to an one-way superimposed sheet bottom plate of piece pre-compaction.

Background

The building industrialization is the current trend of the building industry development in China, and is an important step for realizing 'four-section one-environment-friendly' green buildings. The important characteristics of building industrialization are that building components are prefabricated in factories as much as possible, industrial machinery and complete information management of the factories are fully utilized, the quality of the components prefabricated in the factories can be ensured due to standardization and systematization of management of construction, and the error grade of the building industry can be changed from centimeter grade to millimeter grade.

The horizontal member is one of the earliest members which are prefabricated in factories, and the reason is that the horizontal member prefabrication has small influence on the seismic performance of the whole structure, and the horizontal member is simple to manufacture and install. At present, the most widely used horizontal member prefabrication is a composite floor slab, which is an assembled integral floor slab formed by laminating a composite slab bottom plate and cast-in-place reinforced concrete. The method comprises the steps of prefabricating a bottom plate of the laminated slab in a factory, hoisting the bottom plate of the laminated slab in place by using a tower crane after the bottom plate of the laminated slab is transported to a site by an automobile, laying equipment pre-embedded pipelines on the bottom plate of the laminated slab, laying an upper layer reinforcing mesh of the laminated floor slab, and finally pouring cast-in-place concrete on the bottom plate of the laminated slab. The bottom plate of the composite slab is one of the components of the structural floor slab and is a permanent template for cast-in-place reinforced concrete on the structural floor slab.

The composite floor slab has good integrity and high rigidity, can reduce the workload of supporting templates on a construction site, saves manpower and turnover materials, has good economy, and is an important measure for reducing the manufacturing cost, accelerating the construction period and ensuring the quality of the precast concrete building. The lower surface of the composite floor slab is flat, so that decoration of a finish coat is facilitated, and the composite floor slab is suitable for high-rise buildings and large-bay buildings with high requirements on integral rigidity. The method for manufacturing the composite floor slab is mature, no special requirements are required for the plane and the vertical face of the single body, and the traditional cast-in-place structure is converted into an assembly type building, so that the assembly type floor slab is very convenient. The single prefabricated component of superimposed sheet bottom plate weight ratio is lighter, and conventional tower crane machines can both satisfy the requirement, and construction speed and construction cost are all controlled more easily.

Because the influence of factors such as column nets, room segmentation and the like needs to be comprehensively considered during structural arrangement, the length and the span of the plate are generally larger, if the whole plate is only used as a prefabricated bottom plate, the size of the prefabricated bottom plate exceeds the size limit of automobile transportation, the bottom plate of the laminated slab of each stress unit needs to be formed by splicing a plurality of prefabricated bottom plates, and the laminated slab needs to be divided into a unidirectional plate and a bidirectional plate according to the difference of the seam structure, the support structure and the length-width ratio of the prefabricated bottom plates. The one-way plate is simple and clear in stress, convenient and quick to construct, easy to realize modulization and industrialization of the building industry, and is the mainstream of the current laminated slab application. The bottom plates of the unidirectional superimposed sheet usually adopt separated seams, also called as abutted seams, and structural additional steel bars are arranged on the abutted seams.

The spliced seam is the weakest part of the whole unidirectional composite slab under stress, although the structural additional steel bars are arranged on the spliced seam, because the distance between the steel bars and the bottom of the slab is far, before the additional steel bars play a role, the spliced seam has tensile force, the spliced seam is easy to crack in the using process, the attractiveness and the use of a building are affected, and water seepage and water leakage can be caused in serious cases. At present, the processing method of the edge joint mainly comprises the following two methods:

The first method is that C20 fine stone concrete is used for filling joints at the joints, and micro expansion agent is added into the concrete for filling the joints, so that pre-stress is generated in the joints through the expansion of the concrete in the joints, and the pre-stress can avoid the development of cracks at the joints. The disadvantages of this approach are: (1) the construction is troublesome, the concrete in the abutted seams needs to be constructed before the cast-in-place concrete of the superposed layers is poured, a construction procedure is added, and the construction period and the construction cost are greatly influenced; (2) the little expanding concrete total amount in the piece is little, and the prestressing force magnitude of production is limited, still can guarantee in the use of building early stage that the piece can not produce the crack, but along with the building in active service period growth and the creep influence of piece department prestressing concrete, piece department concrete compressive stress disappears almost gradually, still can the fracture finally, influences the use of building.

The second method is that the building sealant is filled in the abutted seams, the deformation capability of the sealant is stronger, cracks can not be generated in the seams even if the sealant has larger deformation and tension, and the building sealant can be carried out at the stage of building decoration and is used as a part of base layer treatment. However, the service life of the building sealant is generally 15 years, if the environmental temperature is high or the building sealant is irradiated by ultraviolet rays, the service life is shorter, the requirement of 50-year service life of a building structure cannot be met, and if the building sealant is replaced every 15 years, the normal use of the building is influenced greatly. And the fireproof performance of the building sealant is poor, so that the abutted seam position is a weak link of building fireproof, and a fireproof measure needs to be additionally arranged, so that the construction cost of the building is increased.

in conclusion, the abutted seam connection of the bottom plates of the unidirectional laminated slabs is an urgent problem to be solved in the industry, and if the abutted seam connection can be thoroughly solved, the appearance quality and the service performance of a building are certainly improved, and the popularization and implementation of building industrialization are facilitated.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the joint connection, the one-way laminated slab bottom plate for joint prepressing is provided.

the utility model discloses the technical scheme who adopts as follows: a one-way superimposed sheet bottom plate of piece pre-compaction, one section post-cast recess is left to the piece department of one-way superimposed sheet bottom plate at a distance of a section interval, pre-buried connecting reinforcement in the post-cast recess, and the connecting reinforcement end should carry out threaded treatment in advance, connects through the steel bar connector who is used for the on-the-spot connection between the corresponding connecting reinforcement on two one-way superimposed sheet bottom plates of mutually splicing.

Furthermore, the connecting steel bars are connected in the post-cast groove on site.

Furthermore, the steel bar connector needs to be capable of applying prestress, tension can be applied to the connecting steel bars when the steel bars are connected, pre-stress is generated in concrete at the joints through the tension, and the pre-stress can ensure that the joints are kept in a pressed state in the later use process, so that the joints are prevented from cracking.

further, the groove spacing is 600mm to 1000 mm.

Further, the opening length of the groove is 150mm to 200mm, and the opening depth is 100mm to 150 mm.

the utility model has the advantages as follows: the utility model provides an easy difficult problem that ftractures of piece department in the use of one-way superimposed sheet bottom plate, improve the impression quality and the performance of floor, be favorable to building industrialization's popularization and implementation.

Drawings

FIG. 1 is a schematic view of a single one-way laminated slab base plate;

FIG. 2 is an enlarged view of the groove;

FIG. 3 is an enlarged view of the connection of the reinforcing bars at the groove;

FIG. 4 is a schematic diagram of the splicing of two single-direction laminated slab bottom plates;

in the figure: one-way superimposed sheet bottom plate 1, recess 2, connecting reinforcement 3, steel bar connector 4, piece 5.

Detailed Description

The scheme of the invention is further explained in the following with the attached drawings.

As shown in fig. 1-4, the utility model provides an one-way superimposed sheet bottom plate 1 of piece pre-compaction, one section post-cast recess 2 is left to one section distance at every interval of one-way superimposed sheet bottom plate 1's piece department, and pre-buried connecting reinforcement 3 in the post-cast recess 2, connecting reinforcement 3 end should carry out threaded treatment in advance, connects through the steel bar connector 4 that is used for the on-the-spot connection between the connecting reinforcement 3 that corresponds on two one-way superimposed sheet bottom plates 1 of concatenation mutually.

And the connecting steel bars 3 are connected in the post-cast groove 2 on site. The steel bar connector 4 needs to be capable of applying prestress, tension can be applied to the connecting steel bars 3 when steel bars are connected, prestress is generated in concrete at the joints 5 through the tension, the prestress can guarantee that the joints 5 are kept in a pressed state in the later use process, and cracking of the joints 5 is avoided.

further, the distance between the grooves 2 is preferably 600mm to 1000mm, the smaller the distance is, the better the anti-cracking effect is, but the more the number of the connecting steel bars 3 is, the more the cost is increased; the larger the spacing, the less the cost increase, but the cracking resistance effect is limited. The spacing of the grooves 2 needs to be coordinated with the spacing of the distribution bars.

furthermore, the size of the groove 2 is based on meeting the construction requirement, the opening length is 150mm to 200mm, and the opening depth is 100mm to 150 mm.

Furthermore, when the plate span is small and the number of the connecting steel bars 3 is large, the connecting steel bars 3 can directly utilize the distributed steel bars; when the plate span is large or the number of the connecting reinforcing steel bars 3 is small, the connecting reinforcing steel bars 3 need to be arranged independently, or the diameter of the reinforcing steel bars is increased, or the strength grade of the reinforcing steel bars is improved.

Furthermore, a steel bar connector 4 with a prestress applying function is placed in the groove 2, the steel bar connector 4 can adopt Chinese patent ZL201621273630.7 or Chinese patent ZL201820206414.3, the two patents both provide a steel bar connecting structure with the function, other steel bar connecting modes can be adopted, and the requirements can be met as long as the steel bars 3 can be connected and the steel bars can be tensioned.

Another object of the utility model is to provide a construction method of one-way superimposed sheet bottom plate 1 of piece pre-compaction, this method includes following step:

Step 1: manufacturing a one-way laminated slab bottom plate 1 in a factory according to design requirements, reserving a post-cast groove 2 at intervals at a connecting abutted seam 5 of the one-way laminated slab bottom plate 1, pre-burying a connecting steel bar 3 in the post-cast groove 2, and processing the end of the connecting steel bar 3 by connecting threads;

Step 2: pouring and maintaining concrete of the bottom plate 1 of the one-way composite slab, and transporting the concrete to the site after the concrete is qualified;

and step 3: the one-way laminated slab base plate 1 is lifted and positioned on site, the grooves 2 of two laminated slab base plates 1 needing to be connected in a splicing seam are aligned, and the connecting steel bars 3 in the grooves 2 are also aligned;

And 4, step 4: a steel bar connector 4 with a prestress applying function is placed in the groove 2, and tension is applied to the steel bars while the steel bars 3 are connected, the tension can generate prestress on concrete at the joints 5, the prestress can ensure that the joints 5 are kept in a pressed state in the later use process, and the joints 5 are prevented from cracking;

and 5: laying pre-buried equipment pipelines and upper reinforcing steel bars in the unidirectional laminated slab;

Step 6: cast-in-place concrete on the upper part of the laminated slab and in the groove 2 is cast in situ, and finally the one-way laminated slab capable of bearing load is formed. In the later use, because the piece joint keeps the pressurized state all the time, so be difficult to produce the crack.

Claims

1. The utility model provides a one-way superimposed sheet bottom plate of piece pre-compaction which characterized in that: a section of post-pouring groove is reserved at the joint of the one-way laminated slab bottom plate at intervals, connecting steel bars are pre-buried in the post-pouring groove, the ends of the connecting steel bars are subjected to thread treatment in advance, and the corresponding connecting steel bars on the two spliced one-way laminated slab bottom plates are connected through a steel bar connector for field connection.

2. The splice pre-pressed one-way composite floor as claimed in claim 1, wherein the connecting reinforcement is connected in situ within the post-cast groove.

3. The bottom plate of a splice pre-pressed uni-directional composite panel as set forth in claim 1 wherein the reinforcing bar coupler is pre-stressed and is capable of applying a tensile force to the coupling reinforcing bars when the reinforcing bars are coupled.

4. The splice pre-pressed one-way composite floor as claimed in claim 1, wherein the groove pitch is 600mm to 1000 mm.

5. The bottom plate of a seam-precompressed unidirectional laminate as claimed in claim 1 or 4, wherein the groove has an opening length of 150mm to 200mm and an opening depth of 100mm to 150 mm.