CN103924730A

CN103924730A - Permanent glass fiber reinforced polymer (GFRP) material formwork and corresponding GFRP-concrete composite beam

Info

Publication number: CN103924730A
Application number: CN201410143342.9A
Authority: CN
Inventors: 毛继泽; 周鹏; 崔明; 郭庆勇; 贾道光; 李犇
Original assignee: Harbin Engineering University
Current assignee: Harbin Engineering University
Priority date: 2014-04-10
Filing date: 2014-04-10
Publication date: 2014-07-16
Anticipated expiration: 2034-04-10
Also published as: CN103924730B

Abstract

The invention provides a novel permanent glass fiber reinforced polymer (GFRP) material formwork and a corresponding GFRP-concrete composite beam. The GFRP material permanent formwork comprises GFRP box-type structures, wherein the GFRP box-type structures are connected with GFRP grid plates; at least one row of GFRP box-type structures are arranged below the GFRP grid plates; the GFRP grid plates and the GFRP box-type structures are partitioned by a grid bottom plate. The permanent GFRP material formwork is combined with concrete to form the composite beam on the basis of a template. In order to solve the problems that a traditional temporary template needs to be dismantled, the template cannot have a structure function and the time limit for a project is long, the concrete at the upper part is constrained by using GFRP in the template, so that the concrete at the upper part is in a three-dimensional compression state, and the strength of the concrete is improved. Thus, the bearing capacity of the GFRP-concrete composite beam can be improved, the cost can be saved, and the time limit for the project is shortened.

Description

GFRP material permanent formwork and corresponding GFRP-concrete combination beam thereof

Technical field

What the present invention relates to is a kind of template, specifically a kind of GFRP(glass fiber reinforced plastics) material permanent formwork and corresponding GFRP-concrete combination beam thereof.

Background technology

For a long time, in the work items of cast-in-situ concrete both at home and abroad, the making great majority of beam be take the temporary template of application timber or steel as main, the beam forms of this form needs to remove after concrete setting, it is a kind of provisional template, be used for supporting cast structure, in form of construction work, by scene group mould, build moulding.In construction, labour intensity is large, long in time limit, and surface quality cannot meet concrete quality requirement.Simultaneously along with the development in epoch, more " economy ", high " efficiency ", more " environmental protection ", the direction that construction work is from now on pursued beyond doubt, current temporary formwork can not adapt to the new demand that New Times development produces completely.According to statistics, every cubic meter of concrete template consumption is up to 4-5 square metre, and its engineering cost takies the 30%-35% of cast-in-place concrete structure cost, and work consumption 40%-50%, has caused a large amount of wastings of resources at 50% of the duration.Therefore need to design the lifting to improve load bearing beam ability and efficiency of construction and to bring business efficiency of a kind of new permanent template and new combining structure beam.Accompanying drawing 1 is that Northeastern University has proposed the sectional view of a kind of GFRP and box beam and concrete slab combined beam structure in 2009, superstructure concrete structure provides Compressive Bearing Capacity, bottom provides tensile stress for box GFRP structure, although such combination has utilized the characteristic of GFRP tension concrete anti-compression to a certain extent, do not give full play of at that time, without top concrete defect, confine less, thereby can not make concrete improve bearing capacity in three dimension stress, and do not use GFRP have permanent masterplate ability, in the time of construction, still need support, bottom is GFRP structure, utilize the feature that GFRP tensile strength is high, but GFRP is in the tension stage, depth of section is higher, more can make GFRP performance more give full play to, lacking effective design effectively utilizes GFRP, middle shear connector is machinery too, and easily produce stress and concentrate, be structure generation local failure.

Summary of the invention

To the object of the invention is transport in order reducing in cast-in-place concrete construction process, use manpower and material resources sparingly, to shorten the engineering time and a kind of GFRP material permanent formwork and GFRP-concrete combination beam accordingly thereof are provided.

The present invention is achieved in that comprising GFRP box-structure template is comprised of GFRP Turbogrid plates, GFRP box-structure and grid base plate, GFRP box-structure connects GFRP Turbogrid plates, the below of GFRP Turbogrid plates has the GFRP of showing box-structure at least, and GFRP Turbogrid plates and GFRP box-structure separate with grid base plate.Fill concrete in grid in Turbogrid plates, forms GFRP-concrete combination beam.

The present invention also comprises some architectural features like this:

1. on the grid base plate corresponding with GFRP box-structure, there is shear connector, and have the position of grid base plate of shear connector lower than other grid base plates.

The grid shape of 2.GFRP Turbogrid plates adopts rectangle.

The cross sectional shape of 3.GFRP box-structure is rectangle.

4. shear connector and grid base plate are integrated.

5. shear connector is connected with concrete.

Accompanying drawing 4 is the top view of accompanying drawing 3, the grid shape of Turbogrid plates adopts rectangle, in use, during concrete upper portion pressurized, confinement due to grid, make concrete three dimension stress, improved concrete bearing capacity, and longitudinal and horizontal GFRP is in hogging moment place opposing tensile stress, the interaction energy of grid replaces the transverse reinforcement on top simultaneously, makes total reach no-reinforcing-bar design, and structure can more used under adverse circumstances, and template when this part GFRP can be used as construction, accelerating construction progress.

Grid base plate adopts GFRP material back cover, prevent that concrete from flowing to lower part when building, when top is subject to load, the reinforcement of concrete is in opposing compressive stress, fixedly shear connector, increasing section torsional rigidity simultaneously, the extension of middle coagulation, can effectively increase depth of section, and bottom GFRP is made full use of.

Bottom, in order to save concrete, alleviates the weight of member simultaneously, adopts cavity structure.When member is subject to moment of flexure, the following part tension of natural axis, the GFRP that this part pulling force mainly contains bottom bears, because GFRP tensile strength is high, so can bear higher pulling force, when Cross section Design, bottom GFRP thickness is increased, be that the slight high characteristic of GFRP tension is given full play to simultaneously.

Sung Yong PAPK etc. has done a series of tests at GFRP section bar and concrete section scab or use perforated panel connector, proves that the interface bond effect of processing through scab is better compared with epoxy bond.Therefore the design adopts the mixed method of mechanical snap and two kinds of link techniques of scab bonding, guarantees GFRP and concrete synergy, avoids GFRP and concrete stripping damage.

This combining structure has been given full play to the superior function of concrete anti-compression, GFRP tension, by rational design, can accomplish that no-reinforcing-bar is used, so, the corrosion resistant performance of GFRP also can be given full play in combining structure, in the adverse circumstances that this kind of structure can be used.

GFRP-Combined concrete permanent template provided by the invention and corresponding GFRP-concrete combination beam thereof have the advantages such as intensity is high, cost is low, constructability, saving concrete, the pollution of reduction building waste.Can also save the time of stripping, GFRP template can be in the unified making of factory simultaneously, make building operations batch production, be convenient to unified management, improved construction quality, while is the reduction of erection time greatly, save the amount of labour, the negative contingency of avoiding field fabrication template to produce, and make GFRP template become a part for beam, the advantages such as GFRP tensile strength is high, lightweight, corrosion-resistant, good moldability are not fully exerted, and therefore can reduce material cost, particularly reinforcing bar and concrete use amount, can obtain good economic benefit.

Accompanying drawing explanation

Fig. 1 is GFRP and box beam and the concrete slab combined beam structure sectional view of background technology;

Fig. 2 is combined beam structure figure of the present invention;

Fig. 3 is the local amplification sectional view of A part in Fig. 2;

Fig. 4 is the top view of Fig. 3;

Fig. 5 is shear connector structure chart;

Fig. 6 is bottom GFRP box-structure figure.

The specific embodiment

Case study on implementation one: in conjunction with Fig. 2 and Fig. 3, GFRP material permanent formwork and corresponding GFRP-concrete combination beam thereof comprise GFRP Turbogrid plates 1, concrete 2, GFRP shear connector 3, cavity 4, GFRP box-structure 5 and grid base plate 6.GFRP Turbogrid plates 1 have 2 row GFRP box-structures 5, and GFRP Turbogrid plates 1 and GFRP box-structure 5 use grid base plates 6 separate, and make bottom form cavity 4, and the middle shear connector 3 that adopts connects, and makes GFRP and concrete 2 co-ordinations.

Case study on implementation two: in conjunction with Fig. 4, Fig. 5 and Fig. 6, the grid shape in GFRP Turbogrid plates 1 adopts rectangle, has shear connector 3 on grid base plate, and the cross sectional shape of GFRP box-structure 5 is rectangle.

Case study on implementation three: the shear connector 3 in case study on implementation two is integrated with grid base plate 6.

Enforcement case row four: fill concrete 2 in Turbogrid plates 1, form GFRP-concrete combination beam.

Claims

1. a GFRP material permanent formwork, comprise GFRP box-structure, it is characterized in that: GFRP box-structure connects GFRP Turbogrid plates, and the below of GFRP Turbogrid plates has the GFRP of showing box-structure at least, and GFRP Turbogrid plates and GFRP box-structure separate with grid base plate.

2. GFRP material permanent formwork according to claim 1, is characterized in that: on the grid base plate corresponding with GFRP box-structure, have shear connector, and have the position of grid base plate of shear connector lower than other grid base plates.

3. GFRP material permanent formwork according to claim 1, is characterized in that: in GFRP Turbogrid plates, the shape of grid adopts rectangle.

4. GFRP material permanent formwork according to claim 1, is characterized in that: the cross sectional shape of GFRP box-structure is rectangle.

5. GFRP material permanent formwork according to claim 2, is characterized in that: shear connector and grid base plate are integrated.

6. a GFRP-concrete combination beam that comprises GFRP material permanent formwork claimed in claim 1, is characterized in that: fill concrete in the grid in Turbogrid plates, concrete and Turbogrid plates are integrated.

7. GFRP-concrete combination beam according to claim 6, is characterized in that: on the grid base plate corresponding with GFRP box-structure, have shear connector, and shear connector is connected with concrete.