CN2538135Y

CN2538135Y - Arch for steel frame plastic greenhouse and its jointing

Info

Publication number: CN2538135Y
Application number: CN00255429U
Authority: CN
Inventors: 杨永新
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-09-27
Filing date: 2000-09-27
Publication date: 2003-03-05
Anticipated expiration: 2010-09-27

Abstract

A steel-frame vinyl house and the lagging jack of the greenhouse with the connection are provided. The knee lever is a gantry providing with an arch upside and an upright post downside. A circular arc transition is arranged between the arc and the upright post and the strength is increased especially on or near the site of circular arc transition. The two arch springing or nearby sites are connected with each other by tie rod. The short spar welded on the gantry mounting is provided to link the longitudinal tie of the vinyl house and greenhouse.

Description

The bow member in steelframe plastic tunnel and greenhouse and connection thereof

Affiliated technical field

The utility model relates to protection ground facility plastic tunnel and greenhouse, the especially bow member in steelframe plastic tunnel and greenhouse and the connection thereof that plant husbandry and aquaculture are used.

Background technology

The bow member of steelframe plastic tunnel (hereinafter to be referred as booth) ties up in the booth general assembly by being in of being coupled to each other of longitudinal tie and stands on ground steel arched frame or arch door frame in the transversal vertical guide of booth.Existing bow member, according to interrelated data and examine or check in agricultural production and know there are three types, the arch truss that (1) round steel is welded into, its major defect are that material usage is big, blanking and welding job amount are big, the cost height.(2) the arch door frame that curves of single thin-wall steel tube belongs to simple and easy Fast Installation type, is used for north raising rice seedlings in spring more, and its shortcoming is that span is little, bears wind and snow load ability, so that may collapse during driving snow, not corrosion-resistant because of tube wall is thin, service life is short.(3) single steel pipe or round steel curve arched frame, and it is that column occupies cultivated land that there are upright supports, shortcoming in its below, hinders farming.

Steelframe plastic green house (hereinafter to be referred as the greenhouse) bow member structure is similar with booth mostly, and an end of bow member stands on the ground, and the other end is shorter, stands on adverse grade wall top, greenhouse, also exists and the similar shortcoming of Arch frame for large green house.

Summary of the invention

In order to overcome the above-mentioned shortcoming of existing booth and greenhouse bow member, the mechanical characteristics of the utility model utilization arch and door frame improves the bow member structure, and the mode that connects each other of corresponding proposition bow member, mainly makes it cost and hangs down.

The technical scheme that its technical problem that solves the utility model adopts is: the bow member structure has three kinds of patterns: (1) first kind, can be described as simple type, and it is that the arch bottom is the arch door frame of column that curved bar becomes top; Arc transition between arch and the column; Between between two arch springings, near two arch springings or an arch springing connect with near pull bar between another arch springing is; Several quarter butts, the one end is connected on the door frame, the other end towards or deflection door frame inboard, in the general assembly in booth or greenhouse, by these quarter butts and the necessary in addition connector of bow member post end bow member being connected with longitudinal tie is that bow member links up each other.(2) second kinds, can be described as modified, the in the arc-shaped or second-degree parabola shape of the arch on above-mentioned bow member top, and the camber of the span of arch degree central authorities rise-span ratio is little in other words.(3) the third, can be described as reinforced, the arch of above-mentioned modified bow member and the arc transition place between the column and near add hard intensity.

The beneficial effects of the utility model are, the bow member in booth and greenhouse reduces rolled steel dosage about 30 percent than the bow member of existing truss structure, and when reducing a lot of blankings and Welder, the cost that is particularly useful on the large span booth time unit field area is lower; The interior no column of booth the scarp slope interior and greenhouse; If adopt removable the connection between bow member and the longitudinal tie, then accomplish booth or greenhouse easy installation and removal easily, bow member spacing unanimity, installation flushes, and bow member keeps flatness good, increases its stability under loading, helps keeping intensity; Under the not high situation of cost, steel pipe that available wall thickness is bigger or round steel are done the door frame main body of bow member, have improved corrosion resistance, increase the service life; Since the column of bow member part can do than higher and perpendicular to or near perpendicular to ground, then the space at nearly bow member column place is bigger in the booth, it is convenient to do farm work, air flow property is good, can not form the colder dead angle of air, help this place's plant growth or when aquaculture is utilized, increase effectively utilizing the space; Can more convenient ground lay plastic foil on the arch pull bar of bow member, become the insulation of two tunics.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Front view (sketch) when the reinforced bow member of Fig. 1 the utility model connects with longitudinal tie in the booth general assembly.

Front view (sketch) when the reinforced bow member of Fig. 2 the utility model connects with longitudinal tie in the greenhouse general assembly.

Fig. 3 bow member end and longitudinal tie join views (I part among Fig. 1).

The A-A cross section view of Fig. 4 Fig. 3.

Quarter butt on Fig. 5 bow member and with longitudinal tie join views (III part among Fig. 1).

The B-B cross section view of Fig. 6 Fig. 5.

Arch pull bar join views on Fig. 7 bow member (II part among Fig. 1).

The C-C cross section view of Fig. 8 Fig. 7.

Connection between two sections door frames of Fig. 9 bow member, the quarter butt at this place and with longitudinal tie join views (the IV place is local among Fig. 1).

The D-D cross section view of Figure 10 Fig. 9.

Bow member end, Figure 11 greenhouse and adverse grade wall top longitudinal tie and door frame and arch pull bar join views (V part among Fig. 2).

The another kind of pattern view that Figure 12 bow member end connects with longitudinal tie (position is equivalent to I part among Fig. 1).

The E-E cross section view of Figure 13 Figure 12.

Among the figure, 1. ground, 2. longitudinal tie (ground), 3. column, 4. strengthen strength structure (chord member and web member), 5. arch draw-bar seat, 6. arch, 7. longitudinal tie 8. encircles pull bar, 9. longitudinal tie (two sections door frame joints), 10. greenhouse column, 11. adverse grade walls, 12. back walls, 13. vertical pin, 14. quarter butts (U-shaped plate), 15. pins, 16. bolt, 17. quarter butts (bent plate), 18. connecting plates.

Among the figure, F. arch camber, J. arch springing, H. column height, L. span of arch degree.

The principles of science of embodiment and technical scheme institute foundation

In Fig. 1, steel pipe curves arch (6) and column (3), become a door frame, be near the arc transition arch springing (J) between arch and the column, door frame is made with two sections steel pipes here, and the butt joint of IV place connects (for large span arch truss on the door frame symmetrical center line, because of shaped steel raw material limited length, and for the ease of the finished product transportation, the bow member segmentation is manufactured, and is using on-the-spot the connection); The arc transition place between arch and the column and near increasing strength structure (4) is arranged, be welding chord member and web member on the door frame steel pipe here; Two arch springings are linked up in other words (Fig. 1,7 and 8) by being welded to arch draw-bar seat (5) on the door frame and pin (15) near two arch springings with arch pull bar (8) at two arch springings above slightly, for preventing that encircleing pull bar dangles excessive, with finer wire the arch pull bar is hung on the bow member and (not paint among the figure), become the arch door frame of a band arch pull bar of strengthening at the arch springing place like this.

The bow member termination of column in other words is inserted into the vertical pin (13) last (Fig. 1,3 and 4) that is welded on the longitudinal tie (2) that places ground (1); Weld quarter butt (14) on door frame, quarter butt becomes U template shape here, and its end is porose, with pin (15) quarter butt is connected (Fig. 1,5 and 6) with longitudinal tie (7); Weld bent plate with holes (17) at two sections door frame joints, with bolt (16) two sections door frames are connected, and bent plate with holes is connected with longitudinal tie (9), the bent plate with holes here also plays the effect (Fig. 1,9 and 10) of aforementioned quarter butt.Like this, in the booth general assembly, bow member end and each quarter butt and corresponding position longitudinal tie to connect also be that each bow member links up each other.

The structure of greenhouse bow member and with connecting of longitudinal tie be bow member connection each other and similar (Fig. 2 and 11 etc.) of above-mentioned booth.

Bow member can be regarded the arch door frame of band arch pull bar as, its lower end is articulated in ground, if the physical dimension of given above-mentioned routine Arch frame for large green house: the door frame main body of bow member is 1/2 inch heavy wall welded still pipe, encircle in the arc-shaped, column is perpendicular to ground, encircleing in other words, the span of door frame is a L=12 rice, arch camber F=0.1L, arch pitch is F/L=0.1, and the arch pull bar is 6 millimeters round steel of Φ, and column is high 1.65 meters, arch pull bar to the height on ground is 1.75 meters, the bow member spacing is 1 meter, and the cross sectional moment of inertia of transition position and near increasing strength structure thereof is 2～10 times of all the other single steel pipe places between arch and the column, then can calculate its intensity.

The load of bow member has two kinds, and the one, snow load can think to act on the uniform load that is directed downwards of vault, another is the wind load of horizontal direction, the film-pressing line that compresses plastic foil is less to the pressure ratio of bow member, and can think downward uniform load, can ignore.Snow, wind load data standard according to 45 ° of China's north latitude calculate, because arch pitch is smaller, then the moment of inertia of Gong each section can differ very little in theory.The arch pull bar bears the pulling force that two arch springings give when vault is stressed.But when horizontal wind load, the arch pull bar is owing to being flexible generally, and is then inoperative.In theory, the second-degree parabola arch is zero in the moment of flexure of striding arbitrary cross section of encircleing under the downward uniform load effect entirely.Under the little situation of rise-span ratio, the mechanical characteristic of skene arch and second-degree parabola arch differs very little.When bearing horizontal wind load, transition position and near moment of flexure maximum thereof between arch and the column, and vault especially vault middle part moment of flexure is little a lot.

Calculate according to the computational methods that interrelated data provides, the result shows that the intensity of the Arch frame for large green house of above-mentioned the given physical dimension of example is enough.Simultaneously to such as snow load vault center maximum to the both sides linearity be reduced to zero, the snowy half way up the mountain in addition of vault half way up the mountain does not have snow, the long plank of longitudinal lap joint and carry people's weight (stand in plank on plastic foil on lay be incubated overcoat for the people), each situation calculating when all the other specified criterias are 18 meters with above-mentioned identical and span above the booth longitudinal center face vault, its intensity all still can.If the door frame main body of bow member adopts Φ 20 round steel or 3/4 inch common or heavy wall welded still pipe, then the intensity allowance is quite big, and materials are not very too many.Other has one in calculating to be, in the actual use of booth, the film-pressing line two ends of compression molding material film are connected on the ground earth anchor, and film-pressing line becomes certain angle of inclination with ground, then by between it and the plastic foil and the frictional force between plastic foil and the bow member can bear no small horizontal wind load.

Main points for attention in concrete the enforcement: reinforced in the genus aforementioned techniques scheme that (1) present embodiment provides, also can consider to be designed to simple type or modified according to conditions such as weather, span, raw material.(2) the door frame main body of bow member is manufactured the most suitable with steel pipe or round steel generally speaking.(3) arch pitch is general desirable 0.1, and the excessive ceiling center of large span booth that then makes of this value is too high, and each cross section moment of flexure of arch bar differs greatly, and the little pull bar that then encircles of this value is stressed greatly.(4) the arch pull bar generally should be walked in its lower section to work and conveniently be advisable apart from the height on ground with the people, and this highly excessive then column part is also high, and wind load is big.(5) column of door frame can be perpendicular to the ground in the door frame plane, as shown in this embodiment, also can be not orthogonal to ground and promptly favour ground.(6) arc transition is that superincumbent plastic foil local pressure is excessive influence service life in order to prevent to lay between arch and the column, and therefore, the radius of curvature of circular arc should not be too small.(7) quarter butt that is connected on the door frame will have enough length, so that longitudinal tie is not run into the plastic foil that compresses with film-pressing line and make it undermined, but long its intensity that then weakens.(8) other problems, such as arc transition place between arch and the column and near add mode, arch pull bar and the door frame of hard intensity connecting mode, be connected to the quarter butt on the door frame shape and structure and and the segments of the connecting mode of longitudinal tie, door frame knee and per two sections between connecting mode etc. many other selections different with present embodiment are still arranged.Among Figure 12 and 13, weld connecting plate with holes (18) in the bow member termination, bow member is connected with longitudinal tie by the hole on bolt (16) and the longitudinal tie (2).

Claims

1, the bow member in steelframe plastic tunnel and greenhouse and connection thereof, the arched frame of steel or arch door frame, have the structure that can connect on the support body with the longitudinal tie in booth and greenhouse, it is characterized in that: it is that the arch bottom is the arch door frame of column that curved bar becomes top, arc transition between arch and the column, pull bar connects between between two arch springings, near two arch springings or between near an arch springing and another arch springing, have several quarter butt one ends be connected on the door frame other end towards or be partial to the door frame inboard.

2, the bow member and the connection thereof in steelframe plastic tunnel according to claim 1 and greenhouse is characterized in that: the arch on bow member top becomes circular arc or second-degree parabola shape, and arch pitch is little.

3, according to the bow member and the connection thereof in claim 1 and 2 described steelframe plastic tunnels and greenhouse, it is characterized in that: the arch and column between the arc transition place and near add hard intensity.