CN2183659Y

CN2183659Y - Plastic-fibre reinforced cement frame of tunnel greenhouse

Info

Publication number: CN2183659Y
Application number: CN94205682U
Authority: CN
Inventors: 汪士尚
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-03-31
Filing date: 1994-03-31
Publication date: 1994-11-30
Anticipated expiration: 2004-03-31

Abstract

The utility model provides a plastic fibre reinforced cement arch frame for greenhouses, which uses plastic fiber reinforced cement as base materials and is an arch frame of plastic greenhouses for horticulture. The utility model belongs to the technical field of roof slabs. The utility model is characterized in that plastic fibre which takes 1% to 4 % (dry weight) of base materials of cement mortar are distributed in the base materials evenly; main reinforcing steel bars paved in base materials are positioned on the left and right axial lines which are symmetrical on the section of the arch frame particularly; each two steel bars are connected by an equidistant support rod. The utility model can full satisfy the design strength of the arch frame and has easy fabrication. Besides, the structure strength and the service life of the utility model can be guaranteed easily. In addition, the utility model not requests types and the basicity level of cement strictly.

Description

Plastic-fibre reinforced cement frame of tunnel greenhouse

The utility model relates to a kind of precast member for building, belongs to the roofing board technical field.

The plastic tunnel bow member that existing horticultural gardening is used generally is to make with materials such as bamboo wood, reinforcing bar or steel pipes.Wherein, though bamboo radwood Arch frame for large green house cost is low, intensity is little, and the life-span is short, and in the middle of the bow member many pillars need be set, and makes troubles to cultivation management.The plastic tunnel bow member of bar construction is welded into truss structure during manufacturing, though intensity is higher, steel using amount is big, the cost height, and because of surperficial easy-to-rust, impel the plastic greenhouse film accelerated ageing, shorten the life-span.Though steel pipe plastic tunnel bow member steel using amount is few, cultivation management is convenient, but steel tube surface zinc-plated after anti-corrosion, cost is too high, influences large-scale promotion.

1984, document reported once that it was the plastic tunnel bow member of base material that a kind of alkali resistant glass fiber strengthens aluminium sulfate type high-early (strength) cement.Advantages such as though this kind plastic tunnel bow member has the intensity height, the life-span is long, cost is low, not corrosion, but causing in the raw-material selection, its design feature has limitation, be that its fibre reinforced materials only is defined in the employing alkali resistant glass fiber, cement is only limited to the aluminium sulfate type high-early (strength) cement that adopts low basicity, if wherein any material is undesirable, all can cause glass fibre half a year to the one-year age by the powder of the alkaline environment of cement corrosion for disperseing, lose humidification, cause plastic tunnel bow member intensity to reduce, until damage.In addition,, make skin produce to disturb and itch, even allergy occurs, and short broken glass fiber easily disperses to fly upward, cause local environment to pollute, thereby make troubles for the manufacturing construction of plastic tunnel bow member because glass fibre easily stimulates human body.

It is long that the purpose of this utility model provides a kind of intensity height, life-span, be easy to make, and overcritical cement type and basicity plastic tunnel bow member just.

The purpose of this utility model realizes with following technical scheme: on an arch form structure basis of being made up of cement mortar base material and main stress reinforcing bar, the main stress reinforcing bar is divided into main stress reinforcing bar and following main stress reinforcing bar, they all are positioned on the left-right symmetry axis of bow member section, connect by equidistant pole between the reinforcing bar, in the cement mortar base material around the reinforcing bar, add the 1-4%(dry weight) plastic optical fibre.

For the bigger bow member of span, the design bow member by about two symmetrical members form, two members dock by connecting plate.

Plastic optical fibre length in the above-mentioned said cement mortar base material is the 20-60 millimeter, and the cement mortar base material is silicate-type high-early (strength) cement or aluminium sulfate type high-early (strength) cement or the Portland cement that adds early strong accelerator etc.

In addition, bow member section length is 1-2 times of width, and the bottom is the plane with parallel both sides, and top is circular arc.

Structural design of the present utility model can fully satisfy the design strength of bow member, be easy to make, and, because plastic optical fibre has the performance of good antiacid, alkali resistant and resistance to chemical attack, be complementary with any cement so can not make excessive demands the height of the type of cement and basicity, and because plastic optical fibre can not resemble the glass fibre skin to the people produces and stimulate, thereby not only select to raw material and make construction to bring convenience, and be easy to guarantee the intensity and the service life of goods.In addition, the plastic tunnel bow member that integrated cost of the present utility model is a base material than known alkali resistant glass fiber enhancing aluminium sulfate type high-early (strength) cement is low by 25～30%, and is close with bamboo radwood Arch frame for large green house.

Fig. 1 is a cross section of the present utility model;

Fig. 2 is a reinforcing bar configuration end view of the present utility model;

Fig. 3 is connecting plate and main stress reinforcing bar seam schematic diagram.

The utility model is described in further detail below in conjunction with drawings and Examples.

The utility model is made of with pole 2 cement mortar base material 4 that adds plastic optical fibre 3 and the main stress reinforcing bar 1 that is laid in the base material.The height of its section is 1～2 times of width dimensions, and the bottom is the plane with parallel both sides, and top is circular arc.The length of plastic optical fibre 3 is 20～60 millimeters, is evenly distributed in the cement mortar base material 4, and its content is 1～4% of cement mortar dry weight.Main stress reinforcing bar 1 is positioned on the left-right symmetry axis of section, be divided into main stress reinforcing bar and following main stress reinforcing bar, its quantity is decided according to the design strength and the span of bow member, is generally 2～4, promptly respectively distributes 1～2 near near section top circular arc and base plane.The length of main stress reinforcing bar 1 and the shape of laying, according to the length of run of plastic tunnel bow member and dome shape and decide, should be consistent with it.Pole 2 also is the reinforcing bar material, its length is less than the height dimension of bow member section, and according to the centripetal direction of bow member dome-shaped, equidistantly fix with main stress reinforcing bar 1 seam of being laid in advance, make the distance of every main stress reinforcing bar 1 of upper and lower laying keep certain.

For span is 5～12 meters dome-shaped plastic tunnel bow member, and in order to reduce the length of centering member, so that make and transportation, bow member is divided into two members of left and right symmetry.Two members with connecting plate 5 and bolt butt joint, form complete dome-shaped bow member when mounted.Connecting plate 5 is to make with the steel plate of 3～5 millimeters of thickness, is positioned at the upper end of centering member, fixes with main stress reinforcing bar 1 seam of being laid in advance.

The plastic optical fibre 3 that the utility model adopted can be the polypropylene film-fibre, also can be the low-pressure polyethylene monofilament.The diameter of used polypropylene film-fibre counts 6000～26000 with danier (per 9000 meters long gram number); The diameter of low-pressure polyethylene monofilament is 0.05～0.20 millimeter.

The cement that the utility model adopted can be aluminium sulfate type high-early (strength) cement (low basicity), also can be silicate-type high-early (strength) cement (high basicity), or normal silicate type cement adds early strong accelerator.

Main stress reinforcing bar 1 pole 2 of the present utility model and connecting plate 5, its material is carbon structural steel; The diameter of main stress reinforcing bar 1 is 6～10 millimeters, and pole 2 diameters are 5～8 millimeters.

Actual design such as span are that 5～10 meters dome-shaped one plastic optical fibre refinforced cement is the plastic tunnel bow member of base material, are made up of two members that constitute the circular arch type.The profile height of member is 80～120 millimeters, and width is 40～60 millimeters, and the top arc radius is 20～30 millimeters.The polypropylene film-fibre that contains 2～4 mm lengths of 1～4% ratio in the cement mortar of member, cement are the silicate-type high-early (strength) cement, or aluminium sulfate type high-early (strength) cement.The main stress reinforcing bar is 2～4, is the carbon structural steel muscle of 6～10 millimeters of diameters.Pole is the carbon structural steel muscle of 6～8 millimeters of diameters, and 300～450 millimeters every main stress reinforcing bar seam with upper and lower laying in every interval are fixed.The connecting plate of member upper end is that thickness is 3～5 millimeters carbon structural steel plate, and screwhole diameter is 9～13 millimeters.

Claims

1, a kind of plastic optical fibre refinforced cement Arch frame for large green house, it forms arch form structure by cement mortar base material and main stress reinforcing bar, the plastic optical fibre 3 that it is characterized in that uniform 1-4% (dry weight) in the cement mortar base material 4, the main stress reinforcing bar 1 that is laid among the base material is divided into main stress reinforcing bar and following main stress reinforcing bar, they all are positioned on the left-right symmetry axis of bow member section, are connected by equidistant pole 2 between the reinforcing bar 1.

2, plastic tunnel bow member according to claim 1, it is characterized in that bow member can by about two symmetrical members form, two members are by connecting plate 5 butt joint.

3, plastic tunnel bow member according to claim 1 and 2 is characterized in that plastic optical fibre 3 length in the cement mortar base material 4 are the 20-60 millimeter.

4, plastic tunnel bow member according to claim 1 and 2 is characterized in that cement mortar base material 4 is silicate-type high-early (strength) cement or aluminium sulfate type high-early (strength) cement or the Portland cement that adds early strong accelerator etc.

5, plastic tunnel bow member according to claim 1 and 2 is characterized in that the bow member profile height is 1-2 a times of width, and the bottom is the plane with parallel both sides, and top is circular arc.