CN105863145B - Beam-string structure, beam string and building - Google Patents

Abstract

The invention discloses a kind of beam-string structure, beam string and building, the present invention uses the drag-line component by tensioning for the beam-string structure of basic building block.Drag-line is a kind of current common building element, routinely, its construction weight is substantially reduced relative to rigid member used in buckstay, certain enabling capabilities are capable of forming by tensioning, it is adapted to the composite construction of wind up drag-line and lower edge drag-line, this enabling capabilities can effectively be improved, so as to support light roof, such as membrane roofing, structure whereby, span tension cable anti-tensile draws the influence of ability, and capacity of being self-possessed by it is greatly diminished, so as to the span of opposite raising beam string.

Description

Beam-string structure, beam string and building

Technical field

The present invention relates to a kind of beam-string structure, beam string and building.

Background technique

Have such as workshop, large-scale open food market, the provisional parking lot with large span ceiling at present big The facility of span ceiling, roofing, main structure are generally post and panel structure, brick mix structure, reinforced concrete structure or steel knot Structure.This class formation will generally use crossbeam as the architecture of such as ceiling, build other affiliated facilities again according to architecture. Being self-possessed by crossbeam, bigger and itself is rigid is influenced, such as the span of ceiling will receive very big limitation.In addition, even applying Work speed is than faster steel construction, and construction period still can be long, and the requirement to ground is relatively high.

To adapt to existing civil engineering to the needs of large-span steel, in such as Chinese patent literature In CN101196015A, it discloses a kind of beam string, architecture is horizontally disposed buckstay, then in buckstay Downside is hinged with more struts, and the lower end of strut has by cord clip to be fixedly connected with drag-line.Wherein zipper is after tensioning, both ends point It is not fixedly connected with the both ends of buckstay, a kind of bow-shaped structural is integrally formed, to make buckstay because of flexure caused by self weight Deformation is had relatively large span compared to traditional buckstay by a degree of inhibition.

Chinese patent literature CN102199939A discloses a kind of string strutbeam (also known as truss string structure) structure, is a kind of typical case Semirigid structure system, by complicated main rope, secondary rope and oblique cord system change whole string branch structure Path of Force Transfer and its Stress distribution situation, to make string branch girder construction entirety uniform force and improve span.Due to such beam still fall within it is semi-rigid Beam, therein " partly " to refer to grid beams therein, main body self weight is still larger.In addition, the equilibrium of stress distribution is between each rope Stress form, adjustment is got up relatively troublesome.

In addition, the dome structure used in such as big sport place, some spans reach rice up to a hundred or even longer, reality The primary structure of existing large span is also using rope and ring beam and steel construction, and the multilayer tensioning propped up by string, interlayer is in selected spy Strut is set at fixed node, for the stability for keeping dome structure, the Suo Shizhi positioned at bottom is located under the bottom surface of dome, Aesthetics will receive bigger influence, and the strut requires relatively high, design and manufacture hardly possible to the position selection of node Spend it is bigger, so that the duration is relatively long.It substantially constitutes within the scope of long length in addition, being located at undermost rope without any The problem of fulcrum, has even carried out pre- tensioning, can also be generated at middle part it is bigger sagging, and with using prolonging for time It is long, it is sagging can be further obvious.

In addition, netted dome structure in common buildings because its structure is complicated, and be rarely employed in common buildings.

The background technology part of Chinese patent literature CN103993660A provides a kind of patent document as the aforementioned CN101196015A almost the same structure, i.e., using the lower edge drag-line for beam cooperation drop-down of winding up, by the tensioning of lower edge drag-line, The allowance for camber for the beam that winds up is provided, so that the beam that makes to wind up improves the rigid of beam string because the amount of deflection that self weight generates is compensated on the whole Degree.As previously mentioned, this kind of structure belongs to semirigid structure system, it is necessary to which the beam that for example winds up dependent on rigid structure can Basis of formation framework, but the rigid element in " semi-rigid " inevitably generates bigger self weight.Simultaneously, it is clear that , due to string drag-line will the beam string bigger to rigidity be tensioned, required stretching force is very big, itself fail A possibility that also can be bigger.

Meanwhile structural system provided by patent document CN103993660A is also tension string beam structure system, core is still It is wind up beam or upper beam, simply by the system for configuring suitable strut, rope, makes a force dispersion for string drag-line, but It is still necessary to using this foundation structure of beam of winding up.

Summary of the invention

It is an object of the invention on the one hand provide a kind of beam-string structure, in the case where buckstay, Neng Gouyou Effect improves the span of beam string.

Another aspect of the present invention is to provide a kind of beam string using above-mentioned beam-string structure.

Another aspect of the invention is to provide a kind of building using above-mentioned beam string.

According to one aspect of the present invention, a kind of beam-string structure, comprising:

Wind up drag-line；

Lower edge drag-line is opposite with the drag-line that winds up；

Support rod component, upper end to support wind up drag-line described in tensioning and lower end be supported in by tensioning it is described under Support rod assembly array described in one group of string drag-line is winding up between drag-line and lower edge drag-line；

Wherein, the length for being distributed the support rod component in an array gradually shortens from the middle part of array to both ends.

Above-mentioned beam-string structure, optionally, the array are uniform array.

Optionally, the support rod component is straight-bar part, and both ends are fitted with support joint.

Optionally, the support joint is removable be fixedly connected with the connection winded up between drag-line or lower edge drag-line.

Optionally, the support joint includes the support tube for being oriented to and supporting for wind up drag-line or lower edge drag-line, the branch One end of stay tube and accordingly wind up drag-line or lower edge drag-line pressing.

Optionally, the tensile strength of lower edge drag-line is higher than the tensile strength for the drag-line that winds up.

Optionally, the tensile strength of the lower edge drag-line is to wind up 1.5~5.0 times of drag-line tensile strength.

First scheme according to another aspect of the invention, using the beam string of the beam-string structure of first aspect, Further comprise:

Both ends tensioning point；

The height of one midfoot support, the midfoot support is higher than both ends tensioning point, thus between midfoot support and tensioned at one end point Equipped with a beam-string structure, and another beam-string structure is equipped between other end tensioning point；

Wherein, each beam-string structure is formed to form the first tensioning point in respective end tensioning point and formed in midfoot support The first structure of second tensioning point, or there is following second structure:

The drag-line that winds up of two beam-string structures is a upper drag-line two parts that midfoot support is demarcated, correspondingly, two The lower edge drag-line of beam string structure is a downhaul in two parts that midfoot support is demarcated, thus branch among upper drag-line and downhaul It supports in the midfoot support, the corresponding tensioning in both ends is in the end tensioning point of respective end.

Above-mentioned beam string, optionally, in the second structure, the support of upper drag-line and downhaul on midfoot support is removable Fixed support.

Optionally, the structure of the removable fixed support are as follows:

Midfoot support is the support beam perpendicular to vertical plane where beam string；

Upper drag-line is supported in the upside of support beam, and detachable joint compresses；

Downhaul is then hung by detachable joint in the downside of support beam.

Optionally, it is equipped with the locating piece with longitudinal groove in the upper surface of support beam, wherein longitudinal groove is to accommodate And upper drag-line part by the groove is supported, to carry out located lateral；

Downhaul is hung after then passing through a positioning bend pipe in the downside of support beam.

Optionally, the locating piece is compressed by the U-bolt that Open Side Down, and positions bend pipe then by the U of opening upwards Type bolt is hung；

Correspondingly, the corresponding bolt hole for U-bolt assembly is provided in support beam.

Optionally, the both ends tensioning point in the first tensioning point in first structure, the second tensioning point and the second structure In tensioning be using anchor structure.

Optionally, wind up drag-line and the lower edge drag-line are prestress wire.

Alternative plan according to another aspect of the invention, using the beam string of the beam-string structure of first aspect, Further comprise:

Both ends tensioning point, one end tensioning point are higher than other end tensioning point；

One beam-string structure, the both ends tensioning of wind up drag-line and the lower edge drag-line of the beam-string structure is in the end tensioning of respective end Point.

Another aspect according to the present invention, a kind of building of the beam string of another aspect of the invention, in the cross of building There is one group of beam string to array, it is coplanar or belong to a company with the drag-line that winds up for two groups of beam-string structures that midfoot support is boundary Continue guidable composite surface, is outer roofing using the roofing that drag-line is built as skeleton that winds up.

Above-mentioned building, it is optionally, coplanar or belong to the lower edge drag-line for two groups of beam-string structures that midfoot support is boundary In a continuous guidable composite surface, the roofing built using lower edge drag-line as skeleton is interior roofing.

Optionally, after building outer roofing, the drag-line that winds up is straight line or is upper camber line.

Optionally, the support beam supported including one by central post, the support beam constitute the middle part of each beam string Support.

Optionally, tensioning point setting in end is on the column of end.

Optionally, the lower end of the end column hingedly forms swinging structure, and a balance drag-line is connected to the upper of end column End, and pull down and be fixed on bottom surface.

Optionally, the end column is in an acute angle with bottom surface relative to central post flare.

Optionally, the acute angle is 45~75 degree.

Embodiment according to the present invention, it is used neither rigid girder construction, nor semi-rigid girder construction, but adopt With the beam-string structure for by the drag-line component of tensioning being basic building block.Drag-line is a kind of current common building element, routinely, Construction weight is substantially reduced relative to rigid member used in buckstay, and certain enabling capabilities are capable of forming by tensioning, It is adapted to the composite construction of wind up drag-line and lower edge drag-line, this enabling capabilities can be improved, effectively so as to support lightweight Roofing, such as membrane roofing, structure, span tension cable anti-tensile draw the influence of ability whereby, and capacity of being self-possessed by it is by significantly It reduces, so as to the span of opposite raising beam string.

Detailed description of the invention

Fig. 1 is the building structure schematic diagram having in an embodiment according to the present invention by the ceiling that beam string is skeleton.

Fig. 2 is the structural schematic diagram of beam string in an embodiment.

Fig. 3 is the portion the X enlarged drawing of Fig. 1.

Fig. 4 is the portion the Y enlarged drawing of Fig. 1.

Fig. 5 is the portion the Z enlarged drawing of Fig. 1.

Fig. 6 is that tension string beam structure is the ceiling framework structure schematic diagram that basic unit is constituted.

In figure: 1. beam strings, 2. support beams, 3. balance drag-lines, 4. grounds, 5. pile foundations, 6. central posts, 7. end columns, 8. end tension structure.

11. wind up drag-line, 12. lower edge drag-lines, 13. support rod components, 14. support joints.

21. locating piece, 22.U type bolt, 23. positioning bend pipes, 24.U type bolt.

It winds up anchor plate 81. wind up anchorage, 82., 83. lower edge anchor plates, 84. lower edge anchorages, 85. brackets, 86. balances Drag-line anchor plate, 87. balance dragline anchorages.

Specific embodiment

In the present invention, basic structural unit is beam-string structure, and beam-string structure is vertically arranged, thus the vertical plane at place To indulge face, in turn, by across in space, here it is longitudinal crossings.

Laterally, then it is constrained with 1 quantity of beam string, however, the quantity of beam string 1 is not influenced by span.

Routinely, beam-string structure used in beam string at present, the beam string as cited in background technology part or class As beam-string structure, be all buckstay part by the part essence of tensioning, in other words with the " rigid portion in semirigid structure Point ".

It should be appreciated that for a flexible piece, such as common drag-line in building, when it is by horizontal tensioning, with both ends The line of tensioning point is reference, by its effect of weight, closer to intermediate sagging more severe.In plane geometry, jump stay It naturally droops the line between two-end-point and constitutes bow-shaped structural in geometry, the line between two-end-point is in bow-shaped structural String, drag-line then constitute the arc in bow-shaped structural, are also understood as the back of a bow in some applications.

In the present invention, drag-line be referred to as example wind up drag-line 11, lower edge drag-line 12 without departing from beam string it is generally understood that Really, in the structure there is no by the rigid member of tensioning, essence by tensioning is drag-line, but the two inherently constitutes room The skeleton part of face structure, functionally be the same by the rigid member of tensioning.

By the drag-line of tensioning, because middle part caused by gravity naturally droops, to can be understood as being formed by be a kind of lower arc Shape, lower in other words to bend (arch), if supported without others, this kind of structure can be only formed arc lower.

It will be understood then that working as, stretching force suffered by the drag-line by tensioning is bigger, then the lower curvature bent will be smaller, or Person says that horizontality is better.

When by the structure of tensioning, there are also when other fulcrums, sagging meeting is suppressed, will shape when by more fulcrum support It is upper in other words to bend (arch) at the upper arcuate structure of the drag-line 11 shown in Fig. 2 that winds up.

It is not that proper camber line is formed about winding up with lower edge, it is obvious that due to depositing for fulcrum The specifically such as presence of support rod component 13, such as the position that drag-line 11 is supported of winding up will form quilt relatively outstanding Supporting point, two are supported the structure that also will form both ends tensioning between a little, i.e., in the presence of being supported also meeting between a little for two Hang down, even ideally, there is no sagging, as both ends support and the Suo Chengwei between the both ends support that makes is straight Line.

In summary, about wind up drag-line 11 and lower edge drag-line 12 be not upper arc on stringent geometric meaning or under Arc, this is common naming method in engineering.Such as the bolt head of hexagon-headed bolt is also not on stringent geometric meaning Hexagonal prism is a kind of equivalent structure.This kind of naming method can be understood by the technical staff of field of engineering technology, not several Geometry institute considered critical in what meaning.

, it should be understood that the effect of upper bow is arch under this technical conditions, it is seen that the domes in Chinese traditional architecture, Such as arched door, arch bridge.

In contrast, the rate of tension that the drag-line 11 that winds up needs to keep certain, so that making it be formed by bow as far as possible is phase To smooth, influenced by such as support rod component 13 it is smaller, in other words under normal circumstances, under the support of support rod component 13, The position being supported tip easy to form or ridge, if the drag-line 11 that winds up is by the stronger of tensioning, tip or ridge are also unknown It is aobvious, advantageously form the good roofing in surface.

Different from conventional beam string, in the present invention, beam string includes two string units in some embodiments, and In further embodiments then comprising one string unit, each string unit is known as a beam-string structure, when using two When opening string unit, beam string needs longitudinally having midfoot support, and using midfoot support as separation, divides into two string lists Member.

In addition, for it is some continuously across structure, such as be formed by continuously across should be this hair based on multiple midfoot supports A kind of bright application, beam string belong to basic unit therein, should not exist continuously across and think to deviate from protection model of the invention It encloses.

About string unit beam-string structure in other words, as shown in Fig. 2, its constitute substantially it is as follows:

Wind up drag-line 11, and as basic structure, when not building roofing, the drag-line 11 that winds up is upper arc, or is arched up, from And under loaded state, after building roofing in other words, it is driven plain or keeps certain upper arch structure；Under loaded state, 11 lower arch of drag-line of winding up is undesirable state, the lower edge drag-line 12 that can make lay it is relatively difficult, meanwhile, be formed by roofing knot Structure aesthetics is bad, and the wind loading rating of roofing is weaker, is less useful for draining.

With reference to following principle:

In a first aspect, certain rate of tension is necessarily maintained, with bearing capacity when the drag-line 11 that for example winds up is opened by tensioning Increase, rate of tension counteracts the weight of a part of carrier, and curvature becomes smaller.

The structure of second aspect, beam string only one beam-string structure is referred to as one-way slope, have there are two be known as it is double Face slope, wherein the structure of one-way slope winds up tensioning point of the drag-line 11 from the tensioning point of lower end to upper end by each support After the supporting point of bar assembly 13, every section of drag-line and the lift angle degree of facing upward on ground become smaller step by step from bottom to up, form similar upper bow pattern； Tensioning point of the lower edge drag-line 12 from the tensioning point of lower end to upper end is in the supporting point for passing through each support rod component 13 Afterwards, every section of drag-line and the lift angle degree of facing upward on ground become larger step by step from bottom to up, form similar lower bow pattern.

Optionally, double pitched structure winds up supporting point of the drag-line 11 from the tensioning points of two lower ends to upper end by described Each support component support fulcrum after, every section of drag-line and the lift angle degree of facing upward on ground become smaller step by step from bottom to up, formed it is similar Big upper bow pattern, tensioning point of the lower edge drag-line 12 from 2 lower end tensioning points to upper end in this structure is by described each After the supporting point of support rod component 13, every section of drag-line and the lift angle degree of facing upward on ground become larger step by step from bottom to up, form two centres The low continuous lower bow pattern in high both ends.

The second aspect shows under loaded state, will not generate the drag-line 11 that winds up by exceptionally straight state, be through After crossing the supporting point of each support rod component 13, the lift angle degree of facing upward is variation.

It is opposite with the drag-line 11 that winds up about lower edge drag-line 12, as shown in Fig. 2, lower edge drag-line 12, which is located at, to wind up in figure Below drag-line 11, here below should be sensu lato in the following, the height for the every bit on drag-line 11 that is not offered as winding up all Point higher than lower edge drag-line 12, but on same vertical direction, the drag-line 11 that winds up are higher than lower edge drag-line.Here opposite be also It is opposite from bottom to top, and conceptually distinguished under above.

Firstly, be generally cable wire about the drag-line in civil engineering, architectural engineering, design parameter be related to rope diameter, Used steel wire diameter, steel wire item number, metal basal area and metal minimum breaking force (i.e. tensile capacity), cable wire is straight Diameter with steel wire diameter be it is positively related, i.e., rope diameter becomes larger, and correspondingly, used steel wire diameter also becomes larger.

Simultaneously there is also another situation, cable wire generally uses 2,3,7 or 19 steel wires to be twisted, and referred to as 2 Cable wire, 3 cable wires etc..By the twisted of steel wire, flexible rigging with a certain toughness is formed, has very strong tensile capacity.

Concept as used in the present invention, such as the drag-line that winds up, primarily to the title for meeting tensioning and drafting, Selection range is not limited to the cable wire in technical field of civil, can choose including wirerope.

About wirerope, be by mechanical property and the satisfactory steel wire of geometric dimension according to certain rules twisting one The helical form steel tendon risen, wirerope is by steel wire, wire rope core and grease composition.Wirerope be stock is first twisted by multilayer steel wire, then Centered on wire rope core, helically wound rope is twisted by certain amount stock.In material carrying machine, for promotion, traction, tension and Carrying is used.The intensity of wirerope is high, from heavy and light, stable working, be not easy whole root fracture suddenly, reliable operation.

In contrast, construction of wire rope is more complicated than steel strand wires, from another level, it can also be expected that wirerope It is that steel strand wires are twisted again, belongs to the upgraded version of steel strand wires.The frame mode being only twisted again is very more, and respectively has Each purposes.

In addition, such as steel strand wires used in the present invention, also not necessarily need to have label specification using existing Steel strand wires, be twisted since steel strand wires generally use more steel wires, suitable steel strand wires selected according to Suo Li size, thus, Under this technical conditions, in order in the case where meeting used Suo Li size, using Suo Li within the scope of safety coefficient most The drag-line of little Suo power, therefore, it is possible to according to design requirement, using off-gauge such as 5 steel strand wires, 6 or other multifibres Steel strand wires etc..

About the rigging in road and bridge construction, such as suspension cable, used drag-line elasticity modulus reaches 100,000 megapascal easily More than, in order to obtain powerful crystallized ability, anchor structure is generallyd use for the fixation of drag-line.

About used drag-line, for example, wind up drag-line 11 and the preferred prestress steel wiring of lower edge drag-line 12, prestress steel Twisted wire is the stranded steel cable being made of 2,3,7 or 19 high-tensile steel wires, and through eliminating stress processing (stabilization processes).

Here, prestress wire need to coat epoxy resin through preservative treatment, such as surface.

In addition, those skilled in the art can refer to: explanation and tablet menu in we be frequently seen, have 15-7 Φ 5, The prestress wire of the model specifications such as 12-7 Φ 5,9-7 Φ 5.By taking 15-7 Φ 5 as an example, 5 indicate the steel of single diameter 5.0mm Silk, 7 Φ 5 indicate that 7 this steel wires form a steel strand wires, and 15 indicate that the diameter of per share steel strand wires is 15mm, total meaning It is exactly " a branch of 7 (every overall diameter about 15.24mm, dimensional discrepancy+0.40-0.20 by diameter 15mm；Every diameter is about 5.0mm) the reinforcing bar of steel strand wires composition ".General section product is calculated by 140mm2, theoretical fracture value=140*1860=260.4kn, By prestressing force 60%-65% standard, pulling force 156.24-169.26KN can be born.

Due to using high-carbon steel wire rod, cold-drawn, then will be certain by strand structure at steel wire after surface treatment The steel wire of quantity is twisted into stock, forms using the stabilization processes process for eliminating stress.It can be with to extend durability, on steel wire There are metal or nonmetallic cladding or coating, such as zinc-plated, painting epoxy resin.The prestress wire that mould pulls out after twisted by Dies compress process, structure is more closely knit, surface layer be more suitable anchorage grasping.Make un-bonded prestressed steel strand (unbonded steel strand) uses common prestress wire, packet high-density polyethylene after preservation rouge or paraffin Alkene (HDPE) just at.

Above structure based on prestress wire it is found that those skilled in the art according to different applications, Ke Yixuan It selects with other riggings being substituted for each other.

In addition, there is the standard for prestress wire in each state, such as: Chinese Industrial Standards (CIS) GB/T 5224-2014, this field Technical staff can refer to.

Predictably, for different applications, the fixed form of drag-line also be can choose, it is not necessary to all selection anchoring knots Structure, condition are to obtain good fixed function.

As previously mentioned, the application of a simple drag-line is generally structure as described in the background section, pass through it It draws, makes such as its so-called beam string by tensioning.Merely for drag-line, based on the structure of both ends tensioning, no matter both ends are used Great power, it is intermediate always to generate more or less sagging, and upper arch structure as shown in Figure 2 can not be formed.

Using two drag-lines, following drag-line, that is, lower edge drag-line 12 provides the support force for the arch of drag-line 11 of winding up, generates branch The connector of support is support rod component 13 shown in figure, and it is two that support rod component 13 can simplify in design in the figure Power bar, when installation, the support rod component 13 can be separately fixed at wind up drag-line 11 or lower edge drag-line according to design, both ends On 12.Under the conditions of given tensioning, it is believed that above the elongation of lower edge drag-line is positively related, thus, fixed in advance The connection of support rod component 13 and upper lower edge drag-line is not influence its tensioning.

Refer to the only bar in balance by two power about two power bars.It should be known to those skilled in the art that bar was both It can occur to stretch or compressive deformation, can also bend or torsional deformation, therefore the elastic force of bar is not necessarily along the extension of bar Direction, still, the elastic force at two power bar both ends must be along the direction of bar both ends line, and otherwise bar cannot balance.

About support rod component 13, as shown in Fig. 2, the upper end is to support the drag-line 11 that winds up described in tensioning, to upper String drag-line 11 is a kind of supporting role, and the lower end of the support rod component 13 is then supported in by the lower edge drag-line 12 of tensioning, It is then a kind of suppressing action to lower edge drag-line 12, therefore, its tensioning of lower edge drag-line 12 is also wanted gram other than self gravity to be overcome Flexural stress caused by the weight of support rod component 13 is taken, and the flexural stress that the drag-line 11 that winds up is passed over.

Beam-string structure shown in Fig. 2 is a kind of fish belly structure, and in contrast, the curvature of the drag-line 11 that winds up can be relative to The curvature of lower edge drag-line 12 is small, and in other words, the drag-line 11 that winds up can be with opposing straight, to obtain good outer roof structure.

Specifically such as, lower edge drag-line 12 is using tensile strength than the big more ropes of 11 tensile strength of drag-line that wind up, lower edge drag-line It is 12 smaller than 11 curvature of drag-line of winding up, with being described above, 11 upper end of drag-line of winding up to face upward lift angle small, it is big that lift angle is faced upward in lower end, Designing in reasonable range does not influence to drain, this structure can increase interior space height.

Drag-line is the flexible piece different from rigid member after all, and bearing capacity is limited, under the conditions of large span, outer room plane materiel matter The film of lightweight, such as polyurethane film are used as far as possible, mainly plays bridging effect, and ignores its bearing capacity, that is, ignore room The bearing capacity in face itself.

For example roofing uses single layer color steel plate or composite color steel plate again, also belongs to light material.

Large span in the present invention establishes large span on the basis of light roof.Under the conditions of identical span, system Making cost also can be relatively low, and the difficulty of construction of such as polyurethane film also can be relatively low, although service life, bearing capacity can not Compared with the roof structure under the conditions of buckstay, but the application for also thering is it to be applicable in, for example, some industrial building structures, make Not high with life requirements, externally, roofing does not need to possess bearing capacity, and such as polyurethane film, itself can be transparent knot Structure is conducive to daylighting, so as to effectively save alternating current daylighting.

Need can choose different roofings according to different, such as polyurethane film cost is relatively low, itself is also Transparent material can choose such as color steel plate if more demanding to fire rating.

In fig. 1 and 2, it can be seen that in each beam-string structure, there is one group of support rod component 13, it can with this The skeleton of fish belly structure is constructed, external roofing material obtains good supporting role and disperses the effect of outer roofing load, in figure Support rod component is substantially equally distributed.

However, about support rod component count and distribution, be not necessarily it is equally distributed, be, as shown in Figure 2 Structure, support force suffered by the support rod component 13 positioned at middle part is relatively large, and is located at the support rod component 13 at edge Suffered support force is smaller, meanwhile, in design, it is also necessary to consider the rigidity and enabling capabilities of support rod component 13 itself, One side stiffness by itself can bring the variation in weight, and enabling capabilities are then the external manifestations of rigidity.If be distributed more Support rod component 13, will definitely increase the burden of lower edge drag-line 12, to make the requirement of the tensioning component of tensioning lower edge drag-line 12 It further increases.

In the structure shown in Fig. 1 and 2, for each beam-string structure, the support rod component 13 positioned at middle part is played mainly Tectonism, that is, construct beam-string structure effect, and be located at edge support rod component 13, then play the work of distractive load With.

Since the support rod component 13 for being located at edge is relatively short, according to rational mechanics, net stability can be better, changes Yan Zhi, Static stiffness are higher than relatively long support rod component 13, in contrast, positioned at point of the support rod component 13 at edge Cloth density can be relatively large.

As long as can be effectively reduced in being located to wind up drag-line 11 and lower edge drag-line 12 matches suitable curvature The stress of the support rod component 13 in portion.

Bow-shaped structural be in order to make the support rod inside beam-string structure that can play a supporting role, and formed face upward lift angle by The similar bowed structure that grade increases or reduces step by step, between support rod and the node and node of drag-line for straightway (certainly by Effect of weight straightway and nonideal straightway, but have recessed), and form one between adjacent straightway and be less than 180 obtuse angle.

By taking center stayrod as an example, the stress condition of node be can be analyzed to herein: 1, twocouese of the direction perpendicular to support rod Pulling force, 2, to the pressure of support rod axial direction.This structure it is to be understood that

1, upper and lower two drag-lines are constrained to upper and lower arch by support rod, after by being fixed to the tensioning of drag-line both ends, drag-line Length is elongated, makes to generate pulling force then support rod generation pressure inside drag-line, pressure suffered by support rod, reaction is pair The support of upper and lower two drag-lines makes upper and lower two drag-lines have certain opposed restraining forces, prevents what other side's radian from becoming smaller to become Gesture.

2, two connect subparallel upper and lower drag-line and are fixed into linear state (not essential pulling force) at both ends respectively, Parallel uniformly arrangement strut between upper and lower two drag-line, supports as above structure, and upper and lower drag-line becomes class under the action of strut Like bowed shape, upper and lower two drag-lines are made there are certain opposed restraining forces, the trend for preventing other side's radian from becoming smaller.

To sum up, single beam-string structure and the beam string of extension, 4 fixed points of upper and lower drag-line are in a perpendicular, Upper and lower drag-line generates the trend for mutually preventing curvature from becoming smaller by the effect of strut and tensioning, after this beam-string structure is stablized, when Upper and lower string either party bear external applied load pressure after, the drag-line for bearing external force has the tendency that shortening, and another drag-line have it is elongated Trend, the drag-line to shorten gradually become smaller elongated drag-line pressure influence, keep external force value added suffered by elongated drag-line small In external applied load bring pressure, the entire beam-string structure made is more stable.

In addition, the support rod component 13 for being located at edge other than the effect of distractive load, also acts as adjustment and winds up drag-line 11 The effect of shape is laid, with the arc relatively regular as one of drag-line 11 that make to wind up as far as possible, to obtain one relatively Good skeleton.

First, the pressure that lower edge drag-line 12 is transmitted due to the drag-line 11 that assumes responsibility for winding up by support rod component 13, root Lower edge drag-line 12 and strut stationary nodes shearing force are shown as according to mechanical analysis and is converted into cable tension, and multiple groups pole structure can To disperse the certain pressure transmitted that winds up, the shearing force and strut component count of each node have the relationship of inverse ratio, can Reduce the stress defect that drag-line is sheared；Second, similar upper bow, lower arc-shaped are in order to which every support rod component can be played Good effect.

In contrast, the skeleton constructed is relatively low to the Spreading requirements of support rod component 13, to support node It selects complicated unlike present dome structure.

In order to obtain the upper arch structure for the drag-line 11 that winds up, as previously mentioned, the support rod component 13 for being located at middle part is opposite It is longer, and the support rod component 13 for being located at both ends is relatively short, thus, from distribution, the support rod component in an array 13 length gradually shortens from the middle part of array to both ends.

Length tendency about support rod component 13 changes, can to carry the load-bearing after roofing as design element, Under bearing condition, the drag-line 11 that winds up can be substantially straight line or the state in arch, it is clear that and arch is more severe, or The curvature for saying string drag-line 11 is bigger, then the load carried required for lower edge drag-line 12 is bigger.

It is even number under the conditions of a kind of about the quantity of support rod component 13, is odd number under the conditions of a kind of, is preferred with the former Quantity is generally arranged one at the middle part of beam-string structure, then uniformly lays to both ends in a beam-string structure.

When using even number, then it is to be not necessarily forming too long single pole structure, i.e., under odd-condition, there are intermediate single pole knots Structure, the single pole structure are individually formed the top of beam-string structure, and bearing capacity is big, meanwhile, under the conditions of identical arch, the single pole knot The length of structure compares larger, and Static stiffness can decrease.

It about Static stiffness, further, is reacted to above drag-line, node is on the other hand most of on the one hand by shearing force It is converted into cable tension, wherein one can consider that pulling force suffered by interior point is approximately equal since drag-line is flexible member, Pulling force can conduct.

For even number condition, central structure is constructed by two support rod components 13, can effective distractive load, meanwhile, phase For, the length of this two support rod components 13 is grown not as single pole structure, and Static stiffness is easier to ensure that.

In addition, as shown in Figure 1, be individually obliquely installed on beam-string structure ontology, both ends of beam-string structure in other words It is different high, relatively regular roofing skeleton structure is more readily formed although with the support rod component 13 of odd number, but individual Under the conditions of beam-string structure ontology is inclined, the support rod component 13 of even number forms relatively regular roofing skeleton structure and is not also stranded It is difficult.Supporting is state similar or close to circular arc, shape, is straightway (perfect condition) between single every node, Gu odd number item Under part preferably.

In Fig. 2, the main body of support rod component 13 is straight-bar part, lays angle, in some embodiments, can be perpendicular In facing directly, laid with the perpendicular direction of the both ends line for the drag-line 11 that for example winds up, it can also be with 12 both ends line of lower edge drag-line It lays in perpendicular direction.

In some embodiments, the support rod component 13 under the conditions of even number, the support rod component 13 of antithesis can be with two-by-two Angled, which is generally less than 15 degree, based on being parallel to each other, in other words, with this condition, it is understood that there may be support rod The case where component 13 is parallel to each other.

In contrast, when the support rod component 13 of antithesis is angled two-by-two, it is easier to form good supporting role.

So-called antithesis two-by-two is referring to fig. 2 a pair near two intermediate support rod components 13, constitutes an antithesis group, left It outside one, dextrad outer one, constitutes further to antithesis group, and so on.

It take the strong structural member of shear resistance as preferred, such as round tube about the main body of support rod component 13, it is at low cost, and Has good shear resistance, in other words under the conditions of identical weight, the shear resistance of round tube is stronger.

In some embodiments, the main body of support rod component 13 can use fashioned iron, such as I-steel or H profile steel, Shear resistance is also very strong.Square tube material or rectangle pipe material can also be used.

In the profile with complex section, generally to improve shear resistance as the main purpose, such as certain aluminum profiles, Cross section structure is extremely complex, under conditions of guaranteeing integral light, can obtain good shear resistance.Therefore, in some realities Apply in example, can choose relative lightweight aluminum profile (density of aluminium is that the one third of iron is slightly strong, and price is relatively expensive, but by In surface oxidation film easy to form, corrosion resistance is better than steel).

If when using steel pipe, steel tube surface needs to do preservative treatment, for example, by using coating steel pipe.

Since flexible piece is under the action of such as wind, bigger shaking can be generated, thus, the two of support rod component 13 End is fitted with support joint 14, to respective end wind up drag-line 11 or lower edge drag-line 12 is reliably connected.

Beam-string structure is finally accomplished that the carrying to roofing, and roofing is to the load of beam-string structure, in addition to self gravity Outside, the influence of natural environment, such as the impact force of rainwater, the wind pressure of wind, the pressure of snow are also suffered from.The wind pressure of its apoplexy is not Balanced, fatigue load can be generated, so that beam-string structure leads to the problem of bearing capacity decline under the conditions of antifatigue.

In view of this, the support joint 14 and the connection winded up between drag-line 11 or lower edge drag-line 12 are removable fixation Connection, releasable connection purpose be it is adjustable, thus the maintainability under the conditions of adapting to the long-time service of beam-string structure.

It is fixedly connected, is one of necessary condition of structural stability.

In addition, but still can be used although non-disconnectable connection and not preferred, for example, by a pressure ring will for example on String drag-line 11 is pressed in the upper end of support rod component 13, and pressure ring is then fixed on support rod component 13 by the connection structure riveted In the rivet hole of upper end.Riveting belongs to a kind of non-disconnectable connection, but the spiral shell in its antifatigue load-carrying ability ratio such as releasable connection It tethers and connects by force, and be widely used in the strong application of antifatigue load-carrying ability.

When needing to adjust, grind away manufactured head, the riveting after being adjusted using new rivet be also it is feasible, can not The maintainability for tearing connection open is relatively poor, but antifatigue load-carrying ability is stronger than releasable connection.

In some embodiments, the support joint 14 can be a kind of clamp structure, and for example winding up, drag-line 11 is adjusted After in place, clamp.

It in some embodiments, is a kind of supporting role to the drag-line 11 that winds up due to support rod component 13, to lower edge drag-line 12 be that one kind compresses effect, and under conditions of other no loading effects, the support rod component 13 in vertical plane is subject to additional Load is smaller, and therefore, the bonding strength requirement of the connection structure for the drag-line 11 that for example winds up to remaining is not high.Therefore, in this skill Under the conditions of art, one steel pipe is set in such as upper end of support rod component 13, across the steel pipe and adjusts position in the drag-line 11 that winds up It postpones, applying pressure makes the pipe deformation, to lock the drag-line 11 that winds up.It is, prestretching bidirectional stress may be otherwise design To latch pattern.

About steel pipe to the compression point for the drag-line 11 that winds up, in the case where steel pipe is shorter, can as Crimping Pliers crimping, By entire steel pipe compressive strain.If steel pipe is longer, steel pipe throat can be made from one end and is pressed on and for example winds up on drag-line 11.

In addition, used steel pipe can be seamless steel pipe, it is also possible to seamed steel pipe, wherein it is preferred that seamed steel pipe, no Only price is relatively low, and seamed steel pipe is under conditions of its own deforms, it is easier to be removed, can tie up Shield property is stronger.

Support joint herein is fixed with drag-line, connecting portion bearing area be not easy it is excessive, Ying Xuanyong 20CM-50CM it Between be advisable, the excessive transmitting for influencing rope force, make each position discontinuity of drag-line so as to cause deformation it is uneven influence it is entire The dismountable press strip in arc-shaped semi-circular tube cooperation top or the fixed company of hose clamp of above gap can be used in structural stability and intensity herein Supporting point and drag-line, or the block with fixing groove are connect, top cooperates dismountable press strip or lock to be fixedly connected with supporting point and drag-line.

Bigger bearing area is conducive to provide using the support joint 14 of cylinder structure, and cylinder structure can use A degree of bend pipe is easy structure on the whole so that the curvature of supporting point be made to be adapted to the curvature of whole drag-line 11 that for example winds up Make the metastable camber line of curvature.

Meanwhile cylinder structure guide frame easy to form, so that assembly difficulty is relatively much lower in assembly.

Cylinder structure can be directly used necking down process and directly form compression, and construction technology difficulty is low.For cylinder structure In such as seamed steel pipe, dismoutability is also relatively good.

, can be using lifting bolt as support joint 14 for certain structures, the hanging ring of lifting bolt is for for example String drag-line 11 penetrates, the screw rod of lifting bolt, and directly using the inner hole of the support rod component of cast as threaded hole, structure is very simple It is single.

In addition, the adjustment of lifting bolt is also more convenient under conditions of being configured with loose joint nut, loose joint spiral shell can be passed through Mother can adjust the bearing length of whole support rod component 13 in a certain range.

As previously discussed with respect to drag-line 11 and the lower edge drag-line 12 of winding up, identical drag-line can be used, it can also be using difference Drag-line, especially, the tensile strength (the highest Suo Li being capable of providing) of lower edge drag-line 12 is higher than the tension for the drag-line 11 that winds up Intensity.

Using identical drag-line, just with buying and dispensing, but whole use cost is higher, for example, when the lower edge needed is drawn The most hawser power of rope 12 be greater than wind up drag-line 11 when, the lower edge drag-line 12 of minimalist configuration for the drag-line 11 that winds up be also waste.

In view of above-mentioned technical requirements, in specific application, the drag-line of two kinds of specifications is configured, one kind being used as the drag-line that winds up 11, one kind being used as lower edge drag-line, so as to save cost on the whole.

It is smaller especially for span in some simple applications since application is different, and apply relatively simple field It closes, such as the ceiling of provisional food market is built, it is not high to the technical requirements of construction, it is not necessary to accurately be calculated, be winded up Drag-line 11 and lower edge drag-line 12 can use identical drag-line.

In some complicated applications, in particular, for example workshop, may there is relatively high technical requirements to service life, because This, to drag-line 11 is winded up and lower edge drag-line 12 is preferably formed with and is precisely calculated, with the control of save the cost and safety coefficient.

Different according to application, the tensile strength of the lower edge drag-line 12 is to wind up the 1.5~5.0 of 11 tensile strength of drag-line Times, it is however generally that, with the increase of span, lower edge drag-line 12 and the tensile strength ratio of lower edge drag-line 11 can increase under the conditions of this kind Greatly, in other words span and both ratio positive correlation.

Content above-mentioned essentially bright beam-string structure, the beam string addressed below using above-mentioned beam-string structure.

Pointed out in content above-mentioned, as illustrated in fig. 1 and 2, the both ends of beam-string structure be it is different high, be formed by structure As shown in figs. 1 and 6, it is a kind of building roof shape with ridge, while should be appreciated that in the present invention, the ridge Shape is not obvious, and more specifically, the ridge is more like the vault of domes.

Therefore, in some embodiments, two beam-string structures are configured to one string unit, that is, form a beam string 1, Other accessory structures are reconfigured, whole beam string 1 is formed, corresponding roofing is double slope surface structure.

And in further embodiments, a beam string can be with only one beam-string structure, and corresponding roofing is Dan Po Face structure.

Beam string 1 may further comprise: other than configuring necessary beam-string structure

Two are located at the end tensioning point of end, and tensioning point in both ends constrains span, rather than single beam-string structure, or Say that two beam-string structures constrain span.The point is different from existing beam string, and existing beam string, basic string unit is just It is to limit entire span, in other words, a beam-string structure limits a span.

Specifically, as in Fig. 1 and Fig. 2, there are four tensioning anchor points for two end tensioning points reality in single group beam string, divide Not Wei the anchor point of two drag-lines 11 that wind up and the anchor point of two lower edge drag-lines 12, the anchor point of two drag-lines 11 that wind up is in a water In plane, the anchor point of two lower edge drag-lines 12 is on a horizontal surface, and the horizontal plane is relative to construction ground Basal plane, four anchor points are in the same vertical plane, and the vertical plane is the longitudinal surface of beam-string structure noted earlier, while online Guy anchor point is located at the surface of lower edge drag-line anchor point, and there are distances between them, and the distance is by beam string span and winds up The influence of drag-line formation amount of curvature.

Relative to traditional beam string, as shown in Figure 1, the support beam 2 positioned at institute's span from middle part is provided with, in formation Portion's support, it should be understood that support beam 2 needs central post 6 and supported, and central post 6 can have two or more, thus formation pair Effective support of support beam 2, in contrast, support beam 2 then belongs to buckstay, and therefore, it is necessary to meet its span condition Under support.

As previously described, because ridge structure is needed to form, and therefore, the height amount of the being higher than end tensioning point of midfoot support, from And two beam-string structures made are referred to as incline structure.

It is on one side a beam-string structure using midfoot support as separation, another side is another beam-string structure.It should be appreciated that Separating not is segmentation, does not represent two beam-string structures and needs to disconnect from there, does not also indicate that the two cannot not turn off here.

There are two types of basic implementations, referred to as first to implement for configuration tool of two beam-string structures in beam string 1 as a result, Example and second embodiment.

In the first embodiment, in each beam-string structure wind up drag-line 11 and lower edge drag-line 12 is all independent single drawing Rope, correspondingly, the tensioned at one end of the single cable on the end tensioning point of respective end, the other end then tensioning on midfoot support. This kind of structural stability is preferable, but the tensioning difficulty on midfoot support is bigger.

In a second embodiment: the drag-line 11 that winds up in same beam string 1 is in integrated beam string 1 same in other words Two drag-lines 11 that wind up are a drag-lines, and two lower edge drag-lines 12 are also a drag-line, are correspondingly known as upper drag-line and downhaul.

With this condition, midfoot support is no longer tensioning point, but supporting point, thus the drag-line 11 that winds up of two beam-string structures Drag-line is gone up for one, and is become in two parts that midfoot support is demarcated, correspondingly, the lower edge drag-line 12 of two bracing cable structures is one Root downhaul is in two parts that midfoot support is demarcated, so that upper drag-line and downhaul intermediate supports are in the midfoot support, two Hold corresponding tensioning in the end tensioning point of respective end.

In a second embodiment, whole tensioning difficulty is lowered, and the tensioning difficulty especially on midfoot support is being held More selection and operating space are had on tensioning point.

In turn, in a second embodiment, the support of upper drag-line and downhaul on midfoot support is removable fixed support, first First using fixed support, primarily to influence of such as wind pressure to 1 overall stability of beam string is avoided to meet if be not fixed The beam-string structure in wind face can be compressed, simultaneously as the beam-string structure of leeward can be by opposite expansion in by tensile state Greatly, upper drag-line and downhaul can form dragsaw on midfoot support, and be easy to produce very much failure, and whole stability can be very Difference leads to global failure.

It is removable, it is the maintenance convenient for the later period.

About one-way slope structure, can be laid with reference to content above-mentioned.

In some embodiments, should reduce as far as possible therefore should to the structural destruction of such as support beam 2 Number of aperture and perforated area are reduced as far as possible, it is therefore preferred that the structure of the removable fixed support are as follows:

Midfoot support is the support beam 2 perpendicular to vertical plane where beam string；

Upper drag-line is supported in the upside of support beam 2, and detachable joint compresses；

Downhaul is then hung by detachable joint in the downside of support beam 2.

Releasable connection is mainly bolted, and compression can be using such as tabletting or other pressure holding structures, in addition, bolt There are many form, the bolt of some structure types, foregoing lifting bolt configuration movable joint nut can also for example be drawn Rope being fixed and loosening.

U-bolt, such as U-bolt 22, U-bolt 24 shown in Fig. 5 configure a pair of bolts hole, U-shaped structure for it Portion may be constructed compressing structure or hanging structure.

It about compression or hanging, preferably special purpose parts, rather than directlys adopt fastener and is compressed or hung, excellent It is found in Fig. 5 in the embodiment of choosing, in figure, is equipped with the locating piece 21 with longitudinal groove in the upper surface of support beam 2, wherein Longitudinal groove is to accommodate and support the upper drag-line part by the groove, and to carry out located lateral, transverse direction here refers to propping up The direction that " cross " in support crossbeam 2 is referred to.

Obviously in this kind of structure, a beam string 1 can not constitute roofing skeleton, as shown in fig. 6, needing groups of Beam string 1 cooperatively forms roofing skeleton structure, be as previously mentioned, the roofing carried be light roof, thus need compared with More fulcrum, to guarantee that light roof is capable of forming more even curface.Therefore, to beam string 1 in 2 direction of support beam On positioning become extremely important, the structure that there is circular cross-section to drag-line class etc. can be effectively formed using locating piece 21 Positioning.

For hanging, then as shown in figure 5, downhaul is hung under support beam 2 after then passing through a positioning bend pipe 23 Side.In addition, can also be replaced using the pipe with fixing groove or block of such as arc-shaped about positioning bend pipe 23.

Hanging and compression are all made of double bolt arrangements, such as two U-bolts 22 in figure, two U type bolts 24, with Guarantee the stability of assembly.

Under conditions of using U-bolt 22,24, adaptable bolt hole is needed to configure, in figure, support beam 2 is type Steel construction is I-steel in figure, smaller to the reduction of its structural strength directly in the Bian Shangkai bolt hole of I-steel.I.e. not The aperture on the waist of I-steel, to reduce the damage to its structural strength.

Using I-steel or H profile steel structure, be conducive to the laying of bolt.

Since tensioning needs very big power, in the relevant tensioning point of the present invention, such as in first structure The tensioning in both ends tensioning point in first tensioning point, the second tensioning point and the second structure is using anchor structure.

About anchor structure, as shown in figure 3, in figure by the way of anchorage and anchor plate cooperation, by related anchor-hold On bracket 85, bracket 85 is provided with balance cable anchorage 87 and tail rope anchor plate by backwards to the power for holding tensioning point thus 86, so that bracket is in a kind of state of relative equilibrium.Compatible is balance drag-line 3, it is seen that in overall structure shown in FIG. 1 In, i.e., in building applied by beam string.

About the building being applied to, basic characteristics are that longitudinal span is determined by the beam string 1, or is limited to Beam string 1 is then determined by support beam 2 in its transverse direction, due to being buckstay, in the unrestricted situation of 6 number of central post Under, span can not considered.

Thus, in some embodiments, central post 6 can be a pair, to support the both ends of the support beam 2, There can be the central post 6 of auxiliary, be used to support other positions between the middle part or both ends of support beam 2.

It is support spine with support beam 2, has one group of beam string in the horizontal array of building, with midfoot support, such as institute The drag-line 11 that winds up for stating two groups of beam-string structures that support beam 2 is boundary is coplanar or belong to a continuous guidable composite surface, It is the roofing that skeleton is built with the drag-line 11 that winds up is outer roofing.

Coplanar expression support beam 2 is substantially linearly extended, continuously can directive/guide show that support beam 2 may be straight Line extends, it is also possible to and it is not that adapt to different requirement of engineering, such as support beam 2 is annular girder, it is so much corresponding outer Roofing is exactly a pyramidal structure.

In some embodiments, double roof structures be can be, with the lower edge for two groups of beam-string structures that midfoot support is boundary Drag-line 12 is coplanar or belongs to a continuous guidable composite surface, be the roofing that skeleton is built with lower edge drag-line 12 is interior roofing.

Double roof structures contain the structure of interior roofing and outer roofing, other attachmentes can be set, to effectively adjust Temperature in section building, double roof structures are also beneficial to improve the controllability of room temperature.

Preferably, after building outer roofing, the drag-line 11 that winds up is straight line or is upper camber line, to guarantee the integrated beauty of outer roofing The property seen, and mitigate the pressure to lower edge drag-line 12.

As shown in Figure 1, end tensioning point setting, on the column 7 of end, end column 7 can be arranged one for each end tensioning point.

Hold column 7 that can use fixed piling strtucture, due to needing to undertake bigger stretching force, thus, if end When column 7 is arranged perpendicular to ground, the Pile Foundations Design of its own requires relatively high.

In a preferred embodiment, the lower end of the end column 7 hingedly forms swinging structure, and a balance drag-line 3 connects It in the upper end of end column 7, and pulls down and is fixed on bottom surface, tensioning is completed by balance drag-line 3, and end column 7 is played a supporting role.

The angle for balancing drag-line 3 and bottom surface can be changeable, from bearing mode, holds column 7 and bottom surface (usually Face) angle depend on its stress condition, if but end 7 inclination of column it is excessive, bigger construction area can be occupied.For This, the end column 7 is in an acute angle with bottom surface relative to 6 flare of central post.

The acute angle is 45~75 degree.

Under this technical conditions, balance drag-line 3 is directly sagging to be anchored at bottom surface by earth anchor.

Claims (21)

1. a kind of beam string, including beam-string structure, which is characterized in that the beam-string structure includes:

It winds up drag-line (11)；

Lower edge drag-line (12) is opposite with the drag-line that winds up (11)；

Support rod component (13), which has one group, and the upper end of support rod component (13) is opened to support The drag-line that winds up (11) drawn, lower end are supported on the lower edge drag-line (12) by tensioning, and are located at wind up drag-line (11) and lower edge drawing Between rope (12)；

Wherein, the length for being distributed the support rod component (13) in an array gradually shortens from the middle part of array to both ends；

Wind up drag-line (11) curvature it is smaller than the curvature of lower edge drag-line (12)；

The beam string further comprises:

Both ends tensioning point；

The height of one midfoot support, the midfoot support is higher than both ends tensioning point, to be equipped between midfoot support and tensioned at one end point One beam-string structure, and another beam-string structure is equipped between other end tensioning point；

Wherein, each beam-string structure is formed to form the first tensioning point in respective end tensioning point and form second in midfoot support The first structure of tensioning point, or there is following second structure:

The drag-line that winds up (11) of two beam-string structures is a upper drag-line two parts that midfoot support is demarcated, correspondingly, two The lower edge drag-line (12) of beam string structure is a downhaul in two parts that midfoot support is demarcated, thus in upper drag-line and downhaul Between be supported in the midfoot support, the corresponding tensioning in both ends is in the end tensioning point of respective end.

2. beam string according to claim 1, which is characterized in that in the second structure, upper drag-line and downhaul are at middle part Support in support is removable fixed support.

3. beam string according to claim 2, which is characterized in that the structure of the removable fixed support are as follows:

Midfoot support is the support beam (2) perpendicular to vertical plane where beam string；

Upper drag-line is supported in the upside of support beam (2), and is compressed by detachable joint；

Downhaul is then hung by detachable joint in the downside of support beam (2).

4. beam string according to claim 3, which is characterized in that being equipped in the upper surface of support beam (2) has longitudinal direction The locating piece (21) of groove, wherein longitudinal groove is laterally fixed to carry out to accommodate and support the upper drag-line part by the groove Position；

Downhaul, which then passes through, is hung downside in support beam (2) after a positioning bend pipe (23).

5. beam string according to claim 4, which is characterized in that the locating piece (21) is by the U-bolt that Open Side Down (22) it is compressed, and positions bend pipe (23) and then hung by the U-bolt of opening upwards (24)；

Correspondingly, the corresponding U-shaped spiral shell for the U-bolt (22), opening upwards that Open Side Down is provided on support beam (2) The bolt hole of bolt (24) assembly.

6. -5 any beam string according to claim 1, which is characterized in that the first tensioning point in first structure, the The tensioning in both ends tensioning point in 2 tensioning points and the second structure is using anchor structure.

7. beam string according to claim 1, which is characterized in that the array is uniform array.

8. beam string according to claim 1 or claim 7, which is characterized in that the support rod component (13) be straight-bar part, two End is fitted with support joint (14).

9. beam string according to claim 8, which is characterized in that the support joint (14) and wind up drag-line (11) or under Connection between string drag-line (12) is removable is fixedly connected.

10. beam string according to claim 9, which is characterized in that the support joint (14) includes for the drag-line that winds up (11) or lower edge drag-line (12) is oriented to and the support tube that supports, one end of the support tube and accordingly winds up drag-line (11) or lower edge is drawn Rope (12) pressing.

11. beam string according to claim 1 or claim 7, which is characterized in that the tensile strength of lower edge drag-line (12), which is higher than, winds up The tensile strength of drag-line (11).

12. beam string according to claim 11, which is characterized in that the tensile strength of the lower edge drag-line (12) is to wind up 1.5 ~ 5.0 times of drag-line (11) tensile strength.

13. beam string according to claim 1 or claim 7, which is characterized in that the drag-line that winds up (11) and lower edge drag-line (12) For prestress wire.

14. a kind of building using any beam string of claim 1-13, which is characterized in that in the horizontal array of building There is one group of beam string, it is coplanar with the drag-line that winds up (11) for two groups of beam-string structures that midfoot support is boundary or to belong to one continuous It is outer roofing that guidable composite surface, which is the roofing that skeleton is built with the drag-line that winds up (11),.

15. building according to claim 14, which is characterized in that with midfoot support be boundary two groups of beam-string structures under String drag-line (12) is coplanar or belongs to a continuous guidable composite surface, is in roofing that skeleton is built is with lower edge drag-line (12) Roofing.

16. building according to claim 14, which is characterized in that after building outer roofing, the drag-line that winds up (11) is upper camber line.

17. any building of 4-16 according to claim 1, which is characterized in that the branch supported including one by central post (6) It supports crossbeam (2), which constitutes the midfoot support of each beam string.

18. building according to claim 17, which is characterized in that end tensioning point setting is on end column (7).

19. building according to claim 18, which is characterized in that the lower end of the end column (7) is hinged and is formed and is swung Structure, balance drag-line (3) are connected to the upper end at end column (7), and pull down and be fixed on bottom surface.

20. building according to claim 19, which is characterized in that the end column (7) relative to central post (6) flare and It is in an acute angle with bottom surface.

21. building according to claim 20, which is characterized in that the acute angle is 45 ~ 75 degree.