CN208857661U - A kind of joist of multiple rows of truss assembly - Google Patents

Abstract

The utility model belongs to cast-in-situ box girder technical field, specifically provide a kind of joist of multiple rows of truss assembly, including tray and crossbeam, tray includes base body and U-shaped fork, it is connected between one end of crossbeam and a truss by pin shaft, the other end protrudes into U-shaped fork, and U-shaped fork top and bottom end are abutted with crossbeam, is connected between the base body of tray and another truss by pin shaft.Due to assembly three rows or more truss when, beam-end shelves truss without leeway, simple and convenient by the way that the simple connection of tray and crossbeam to be extended to the length of crossbeam, improves assembly efficiency.

Description

A kind of joist of multiple rows of truss assembly

Technical field

The utility model belongs to cast-in-situ box girder technical field, and in particular to a kind of joist of multiple rows of truss assembly.

Background technique

Cast-in-situ box girder typically belongs to the superstrate portion of large bridges, and bridge usually needs to pass through river, ditch The region with a varied topography such as canal and road, ground environment is complicated and changeable, and ground is softer, and general bridge between subgrade away from From longer, it is therefore desirable to first build supporter on subgrade.Traditional construction is made using full hall total sub-semigroup and Bailey bracket It for the form bracing system of cast-in-situ box girder, takes up a large area, steel pipe spacing is small, and consumptive material is huge, and worker operating space is small, and construction is not Convenient and construction period is longer, especially to the more demanding of ground, it usually needs the particularization of large area is carried out to bottom ground Consolidation process.In addition, total slenderness ratio is larger when total sub-semigroup frame body is higher, the upright bar coefficient of stability is small, bend resistance ability Weaken, the decline of whole lateral stability be easy to cause discontinuity phenomenon between upright bar, the Wind effects to be considered compared with Greatly.When needing to be horizontally mounted three rows or more Bailey brackets, it is inconvenient that positioning is carried out by hanging device, and operate hardly possible Degree is high.

Summary of the invention

The purpose of the utility model is to overcome the difficult problems of multiple rows of Bailey bracket installation in the prior art.

For this purpose, the utility model provides a kind of joist of multiple rows of truss assembly, including tray and crossbeam, tray include Base body and U-shaped fork are connected between one end of the crossbeam and a truss by pin shaft, and the other end protrudes into the U-shaped fork, The U-shaped fork top and bottom end are abutted with the crossbeam, are connected between the base body of the tray and another truss by pin shaft It connects.

Preferably, institute's crossbeam is I-steel, and the web of the I-steel is inserted into the U-shaped fork, the I-steel The edge of a wing is abutted with the U-shaped fork.

Preferably, hole is equipped at the web of the crossbeam, peg passes through described hole and the upper end with the U-shaped fork It abuts.

Preferably, the end at the U-shaped fork is equipped with through-hole corresponding with described hole, and the peg passes through the through-hole And hole.

Preferably, the end at the U-shaped fork is equipped with notch, and the peg is located in the notch.

Preferably, the other end of the crossbeam is equipped with opening, and the end at the U-shaped fork is protruded into the opening.

Preferably, the section of the end at the U-shaped fork is in I-shaped.

The utility model has the beneficial effects that the utility model provides a kind of joist of multiple rows of truss assembly, including support Block and crossbeam, tray include base body and U-shaped fork, are connected between one end of crossbeam and a truss by pin shaft, the other end protrudes into U In type fork, U-shaped fork top and bottom end are abutted with crossbeam, are connected between the base body of tray and another truss by pin shaft. Due to assembly three rows or more truss when, beam-end shelves truss without leeway, passes through simply connecting tray and crossbeam The length for extending crossbeam is connect, it is simple and convenient, improve assembly efficiency.

The utility model is described in further details below with reference to attached drawing.

Detailed description of the invention

Fig. 1 is the assemble flow schematic diagram of cast-in-situ box girder shuttering supporting body provided by the utility model；

Fig. 2 is cast-in-situ box girder shuttering supporting body structure subjectivity schematic diagram provided by the utility model；

Fig. 3 is cast-in-situ box girder shuttering supporting body structure schematic side view provided by the utility model；

Fig. 4 is the truss structure schematic diagram of cast-in-situ box girder shuttering supporting body provided by the utility model；

Fig. 5 is the reinforcement chord member schematic top plan view of cast-in-situ box girder shuttering supporting body provided by the utility model；

Fig. 6 is the reinforcement chord member schematic side view of cast-in-situ box girder shuttering supporting body provided by the utility model；

Fig. 7 is the wind-resistant pull rod structural schematic diagram of cast-in-situ box girder shuttering supporting body provided by the utility model；

Fig. 8 is the supporting block structure view of cast-in-situ box girder shuttering supporting body provided by the utility model；

Fig. 9 is the schematic front view of the chord member jack of cast-in-situ box girder shuttering supporting body provided by the utility model；

Figure 10 is the schematic top plan view of the chord member jack of cast-in-situ box girder shuttering supporting body provided by the utility model；

Figure 11 is the mounting structures schematic diagram of cast-in-situ box girder shuttering supporting body provided by the utility model；

Figure 12 is the chord member jack of cast-in-situ box girder shuttering supporting body provided by the utility model and one kind of truss structure Connection schematic diagram；

Figure 13 be cast-in-situ box girder shuttering supporting body provided by the utility model chord member jack and truss structure it is another Kind connection schematic diagram；

Figure 14 is the field application schematic diagram of cast-in-situ box girder shuttering supporting body provided by the utility model.

Description of symbols: concrete continuous footing 100, vertical Bailey bracket 200, lateral Bailey bracket 300, bowl fastening type foot hand Frame 400, bed course 101, cushion cap 102, top boom 201, lower boom 202, vertical bar 203, brace 204, crossbeam cushion block 205, window catch hole 206, top boom bolt hole 207 supports frame aperture 208, beam clamp hole 209, chord member yin head 210, chord member male 211, lower boom Bolt hole 212, upper location hole 1, lower Positioning holes 2 reinforce chord member male 3, reinforce chord member yin head 4, the first pin 5, the first pin Hole 6, hinge 7, screw-button 8, locking nut 9, Length Indication block 10, the second pin hole 11, the second pin 12, crossbeam 13, tray 14, U-shaped fork 15, peg 16, fastener 17, intermediate plate 18, jack 19, screw rod 20, guiding piece 21, the first connecting hole 22, second Connecting hole 23, mounting 24, the first plate 401, the second plate 402, reinforcing rib 403.

Specific embodiment

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work All other embodiment obtained, fall within the protection scope of the utility model.

In the description of the present invention, it should be understood that term " center ", "upper", "lower", "front", "rear", The orientation or positional relationship of the instructions such as "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is based on attached drawing institute The orientation or positional relationship shown, is merely for convenience of describing the present invention and simplifying the description, rather than indication or suggestion is signified Device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as to this is practical Novel limitation.

Term " first ", " second " be used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or Implicitly indicate the quantity of indicated technical characteristic." first " is defined as a result, the feature of " second " can be expressed or imply Ground includes one or more of the features；In the description of the present invention, unless otherwise indicated, the meaning of " plurality " is two It is a or more than two.

The utility model provides a kind of cast-in-situ box girder shuttering supporting body assembly technology, as shown in Figures 1 to 12, specific to wrap Include following steps:

S01: smooth ground and in pouring multiple concrete continuous footings 100 on ground is provided in the strip footing Bailey bracket unit, the Bailey bracket unit include vertical Bailey bracket 200 and lateral Bailey bracket 300.In particular excavate bar shaped base Lumps of wood template is set up in the plinth earthwork, is poured C2O plain concrete and is formed bed course 101；Strip footing reinforcing bar is bound on the bed course, Then installation template pours C3O concrete bearing platform 102, the big 10cm or more in bed course size side more every than cushion cap.Thus may be used Know, as shown in Figure 1 to Figure 3, the concrete technology flow process of Horizontal concrete strip footing 100 be unwrapping wire position → excavate strip footing The earthwork → plain concrete cushion layer → temporary strip reinforcement foundation binding → installation template → installation of embedded parts → casting concrete → Maintenance.Specifically, earth excavation excavates the method matched with hand excavation, tankage after excavation using a crawler-mounted excavator The rubbish such as loosened soil, the sundries at bottom are cleaned out, and substrate is tamped, and ensure foundation bearing capacity up to 150kPa or more with test.Bed course is adopted With C20 plain concrete, thick 100mm, before pouring, it is ensured that Land leveling is wet.It can be used the lumps of wood as template when pouring, use vibration It smashes device to vibrate, and levelling according to elevation control.The big 10cm in bed course size side more every than cushion cap sprinkles water after the completion of pouring and supports Shield.Reinforcing bar has to comply with existing national technical standard, has outgoing certificate and test report.It to be examined after the entering of reinforcing steel bar It tests, could be used after qualified.Reinforcement installation position deviation should meet in " concrete structure engineering construction quality accident specification " It is required that carrying out self-test to reinforcing bar before casting concrete, after self-test is qualified, report management carries out acceptance of concealed work, items construction Record must be complete, complete.Template opposite joint is tight, no spillage.When assembled, it is necessary to be assembled into strict accordance with cushion cap template size whole Body；The piece between adjacent plate face is controlled, and template connection adds adhesive tape and is sealed at yin-yang angle, with mortar leakage prevention.? In one specific implement scene, interim base built-in fitting is 800*800*20 steel plate, and steel plate welds 4 20mm reinforcing bars.It is pre-buried Part field fabrication will place smooth, and fixation when pre-buried, interim base uses C30 concrete, and length is elongated (base Width and height take different sizes depending on live soil property situation), and vibrated with poker vibrator, after the completion of pouring in time Maintenance.

S02: the vertical Bailey bracket 200, the vertical shellfish thunder are set up respectively on each concrete continuous footing 100 Frame 200 includes multilayer truss structure, and the truss structure is sequentially connected from top to bottom, is led between truss structure described in adjacent two layers It crosses and is bolted.As shown in Figure 4, wherein Bailey bracket unit includes truss structure and support frame 208, and truss structure includes winding up Bar 201, lower boom 202, vertical bar 203 and brace 204.It is connected between the two neighboring truss structure of horizontal direction by truss Pin connection, the both ends of specific top boom 201 and lower boom 202 are designed with chord member yin head 210 and chord member male 211, purlin respectively Frame connecting pin one end is equipped with taper, and pluggable safety plug is equipped on the inclined-plane of the taper.In construction and bridge use process In, truss connecting pin can move, and safety plug can be stuck in the chord member of truss structure, and the presence of taper can be more easily Truss connecting pin is taken out, safety plug and truss connecting pin easy to disassemble from one end, and insured pin to truss connecting pin When conveniently give pretightning force.It is connected between the two neighboring truss structure of vertical direction by truss bolt；Support frame is used Connection between the adjacent two rows Bailey bracket unit of connection horizontal direction, the both ends of support frame are adjacent with horizontal direction respectively It is bolted between support frame aperture 208 on the top boom 201 and vertical bar 203 of two rows of truss structures.It is so just complete At X, Y of Bailey bracket and the installation in three directions of Z axis, horizontally adjacent Bailey bracket is first installed, then pacify by support frame 208 Horizontally adjacent two rows of Bailey brackets are filled, the adjacent Bailey bracket of vertical direction is finally installed.

S03: lateral Bailey bracket (300), the transverse direction Bailey bracket are set at the top of each vertical Bailey bracket 200 (300) include horizontally disposed multiple rows of truss structure, connected between the adjacent two rows truss structure by support frame.Thus may be used Know, the lower end of each row's transverse direction Bailey bracket 300 is all pressed in the top of each vertical Bailey bracket 200, and lateral Bailey bracket 300 can be One row is also possible to horizontally disposed multiple rows of truss structure.

S04: total sub-semigroup 400 is set up at the top of the lateral Bailey bracket 300.As shown in figure 14, in Bailey bracket The top surface of combined system is laid with I-steel, according to the upright bar reasonable cloth of spacing in length and breadth of designed the rim of a bowl formula scaffold support system It sets, it is ensured that upright bar is located on the central axes of I-steel top surface.

The utility model additionally provides a kind of reinforcement chord member of Bailey bracket, including reinforces chord member ontology, the reinforcement string Bar body includes reinforcing rib 403 and the first plate 401 and the second plate 402 that are oppositely arranged in parallel, first plate 401 It is welded between second plate 402 by reinforcing rib 403, is connected between first plate 401 and second plate 402 It is connected to orifice plate, the orifice plate is equipped with positioning corresponding with the top boom bolt hole 207 of Bailey bracket or lower boom bolt hole 212 Hole is bolted between the reinforcement chord member ontology and Bailey bracket.As shown in Figure 5 to Figure 6, upper layer and lower layer Bailey bracket it Between be additionally provided with reinforcement chord member, reinforce chord member ontology and be oppositely arranged in parallel by the first plate 401 and the second plate 402, then led to The welding of reinforcing rib 403 is crossed, reinforcing rib 403 can be I-steel or angle steel, be respectively equipped on top boom 201 and lower boom 202 For the top boom bolt hole 207 and lower boom bolt hole 212 connecting with reinforcement chord member, the both ends for reinforcing chord member, which are also correspondingly provided with, to be added Strong chord member male 3 and reinforce chord member yin head 4, by reinforcing chord member male 3 and to reinforce chord member negative between two neighboring reinforcements chord member First 4 connection, and fixed by bolt.

Preferably scheme, the end for reinforcing chord member yin head 4 are equipped with protrusion, and the reinforcement chord member male 3 is equipped with to be added with described The corresponding recess of protrusion of strong chord member yin head 4.It follows that between two neighboring reinforcement chord member when carrying out assembly alignment, By protrusion insertion recess formed Primary Location, then by bolt will reinforce chord member male 3 and reinforce chord member yin head 4 connect.

Preferably scheme, the location hole include upper location hole 1 and lower Positioning holes 2, the upper location hole 1 and described lower fixed The axis in position hole 2 is not overlapped or the upper location hole 1 and the axis of the lower Positioning holes 2 are overlapped.When the axis of upper lower Positioning holes When line is overlapped, upper layer Bailey bracket reinforces chord member and lower layer's Bailey bracket by a stay bolt through being fixedly connected, and reduces bolt Quantity, it is easy for installation；When the axis of upper lower Positioning holes is not overlapped, upper and lower level Bailey bracket is separately connected by lag bolt, in this way Reinforce chord member and form a buffer strip in the centre of upper and lower level Bailey bracket, can effectively absorb entire Bailey bracket support system Vibration.It can also two kinds of connection types and there are on a reinforcement chord member.

The utility model additionally provides a kind of joist of Bailey bracket assembly, including tray 14 and crossbeam 13, and tray 14 wraps Containing base body and U-shaped fork 15, connected between one end and a truss of the crossbeam 13 by pin shaft, the other end protrudes into described U-shaped In fork 15, U-shaped 15 top of fork and bottom end are abutted with the crossbeam 13, the base body and another truss of the tray 14 Between pass through pin shaft connect.As shown in Figure 4 and Figure 8, wherein lower boom 202 is equipped with crossbeam cushion block 205, and vertical bar 203 is equipped with Beam clamp hole 209, to the position of fixed cross beam 13 in the plane, specifically, the abdomen of crossbeam 13 is equipped with hole, by this Hole cooperates beam clamp hole 209 to form fixation, and is further fixed by the crossbeam cushion block 205 on lower boom 202, After installing the Bailey bracket of a row, support is done to install the Bailey bracket of second row by crossbeam 13, crossbeam 13 is by I-steel structure At, when the length of crossbeam 13 is inadequate, increase the length of crossbeam 13 by connecting tray 14 in 13 one end of crossbeam, specifically, 14 end of tray is equipped with U-shaped fork 15, and the abdomen of crossbeam 13 is protruded at U-shaped fork 15, and, the sheet of tray 14 fixed by peg 16 Body contacts to form support with the edge of a wing of crossbeam 13.Wherein, the vertical bar 203 in truss structure is made of No. 8 I-steel.

Preferably, crossbeam 13 is I-steel, and the web of the I-steel is inserted into the U-shaped fork 15, the I-steel The edge of a wing abutted with the U-shaped fork 15.Fork 15 U-shaped in this way and the edge of a wing of I-steel form two fulcrums, base body energy Next need truss structure to be mounted is held up.Hole can also be equipped at the web of crossbeam 13, peg 16 passes through described Hole is simultaneously abutted with the upper end at the U-shaped fork 15, is formed fulcrum by peg 16, can also be set in the end at U-shaped fork 15 It sets the modes such as notch, through-hole to form fulcrum with peg 16, opening can also be set in the other end of crossbeam 13, U-shaped fork 15 End, which is protruded into, forms fulcrum in the opening.

Preferably, the section of the end at U-shaped fork 15 is in I-shaped, because the end at U-shaped fork 15 is primarily subjected to moment of flexure, It is I-shaped effectively to improve bending strength.

Further, when installing the crossbeam 13, the vertical bar of described 13 one end of crossbeam and the first row truss structure 203 lower end connection, the other end of the crossbeam 13 are connect by diagonal brace with the top boom 201 of the first row truss structure. Support frame aperture on the vertical bar 203 of rigidity of the diagonal brace (not shown) for web beam 13, diagonal brace one end and truss structure 208 are bolted, and are bolted between the other end and crossbeam 13, and every section truss structure fills a pair on vertical bar 203 Diagonal brace.

The utility model additionally provides a kind of wind-resistant pull rod of Bailey bracket, as shown in figs. 4 and 7, comprising: the first connection Bar, the second connecting rod, screw-button 8 and Length Indication block 10, the screw-button 8 are removably nested in the Length Indication block 10 Interior, one end of the first connecting rod is connect with the threaded one end of the screw-button 8, and one end of the first connecting rod against In one end of the instruction block, one end of second connecting rod is connect with the threaded one end of the screw-button 8, and described second One end of connecting rod is resisted against the other end of the Length Indication block 10.It follows that the end of the lower boom 202 of truss structure It is additionally provided with elliptical aperture on the web of channel steel, is used for connection wind-resistant pull rod.Wind-resistant pull rod both ends are respectively equipped with 6 He of the first pin hole Second pin hole 11, it is corresponding to be equipped with the first pin 5 and the second pin 12, wherein the first pin 5 and the second pin 12 pass through Chain system hangs on wind-resistant pull rod, and the side at the both ends on top boom 201 and lower boom 202 is equipped with window catch hole 206, and first The window catch hole 206 of one end of pin hole 6 and lower boom 202 is cooperated by the first pin 5, the and pin hole 11 and top boom 202 The window catch hole 206 of one end pass through the second pin 6 and cooperate, two wind-resistant pull rods of connection in this way, and two wind resisting handrail X-shapes At rock-steady structure, anti-lateral wind action is played.Wherein, wind-resistant pull rod is made of two bars, passes through hinge 7 between two bars Connection, therefore, when wind resisting handrail when not in use, can be folded.

Further, be additionally provided with length adjustment device in one end of wind-resistant pull rod, as shown in fig. 7, at this point, wind-resistant pull rod by Three bar compositions, first connecting rod one end is equipped with the first pin hole 6 and the first pin 5, one end of the other end and the second connecting rod Connected by hinge 7, the other end of the second connecting rod is connect with length adjustment device threaded one end, one end of third connecting rod with The other end of length adjustment device is threadedly coupled, and the other end of third connecting rod is equipped with the second pin 12 and the second pin hole 11. Wherein length adjustment device includes screw-button 8, locking nut 9 and Length Indication block 10, and instruction block 10 detachably connects with screw-button 8 It connects, locking nut 9 is connected in the second connecting rod, instruction block 10 has different specifications, by installing in screw-button 8 Then second connecting rod and third connecting rod are screwed into screw-button 8 respectively and are supported by the Length Indication block 10 of different specification size The both ends of Length Indication block 10 are leaned against, can so reach the length requirement of preset entire wind-resistant pull rod, then tighten locking The second connecting rod is fixed in nut 9, it is preferable that can also also install a locking nut 9 in third connecting rod and realize Fixation to third connecting rod.

The utility model additionally provides a kind of cast-in-situ box girder formwork bracing system, comprising: multiple concrete continuous footings 100, multiple concrete continuous footings 100 are located on smooth ground, and multiple concrete continuous footings 100 are set up respectively There are multiple vertical Bailey brackets 200, be erected with lateral Bailey bracket 300 in multiple vertical Bailey brackets 200, in the lateral shellfish thunder Total sub-semigroup 400 is erected on frame 300.It is cast-in-place that this can be obtained by above-mentioned cast-in-situ box girder shuttering supporting body assembly technology Box girder formwork support system, just repeats no more herein.

The utility model additionally provides a kind of chord member jack device of Bailey bracket, including diamond shape frame unit and screw rod 20, the diamond shape frame unit includes two layers of diamond shape frame body, is fixedly connected between two layers of diamond shape frame body, the diamond shape frame body packet Multiple draw bars 21 are included, multiple 21 head and the tail of draw bar hingedly form a sealing ring, the screw rod 20 and the diamond shape frame A pair of unit is diagonal to be threadedly coupled, and the screw rod 20 is located between two layers of diamond shape frame body.As shown in Fig. 9 to Figure 12, When the upper layer truss structure is installed, the lower boom 202 and lower layer's truss in the truss structure of upper layer are made by chord member jack Truss bolt hole alignment between top boom 201 in structure.Draw bar 21 hingedly forms a water chestnut by fastener 17 two-by-two Shape frame body crosses a screw rod 20 on its diagonal line, with the difference of the rotation direction of screw rod 20, can open diamond shape frame body Or it closes；Intermediate plate 18 is installed at another diagonal line both ends, in order to which rhombic lifting jack is located on the chord member of truss structure, with Closing for rhombic lifting jack, can push or draw over to one's side truss open.Bridge is after installing lower layer, due to dead load and pin and pin Gap between hole, it will curved or upper doming effect under generation must use chord member so that connector is staggered when making to install upper layer truss at this time After upper layer truss is pushed away, drawn in place by jack, pin could be inserted into.

When curved under frame body, as shown in figure 12, it is intended to load onto a layer truss, the top pin hole of vertical adjacent truss can have no to be stranded It is aligned difficultly, is inserted into pin；But the pin hole of the lower boom 202 of truss is sagging due to lower layer's truss structure, is necessarily staggered, to borrow External strength can just be such that they are aligned.At this point, one end of wherein upper layer and lower layer truss is fixed with truss bolt and (is not required to tighten), Mounting 24, the lower edge of the first connecting hole 22 and upper layer truss structure of mounting 24 are placed on the top boom 201 of lower layer's truss structure It is connected between bar 202 by steel pin, the second connecting hole 23 and the jack on the intermediate plate 18 of one end of rhombic lifting jack of mounting 24 It is connected between 19 by steel pin, rhombic lifting jack, the other end and intermediate plate 18 of rhombic lifting jack is put between mounting 24 and truss It is connect between the chord member male 211 of the top boom 201 of next layer of truss structure by steel pin.Rotation screw rod 20 makes diamond shape thousand It is gradually opened by the position closed originally on jin top；At this point, one end of jack heads on mounting 24, the other end pushes truss, under making The bolt hole that portion is staggered is drawn close slowly, until alignment.

It is intended to load onto a layer truss when frame body generates arch, as shown in figure 13, at this point, two mountings 24 are placed on upper layer truss On the top boom 201 of horizontally adjacent two truss, connection rhombic lifting jack in centre rotates screw rod 20, makes rhombic lifting jack by original Position to open progressively closes off, and the adjacent pin hole that upper layer truss top is staggered is drawn over to one's side slowly.

Further, 20 both ends of screw rod are equipped with nut, are fixedly connected between the nut and the screw rod 20.Pass through Spanner is covered can rotate screw rod 20 on nut, more labor-saving.

Further, the both ends of the screw rod 20 are equipped with round tube hole, and the round tube hole axis and 20 axis of screw rod hang down Directly.Being inserted into round tube hole by rod piece can also be more labor-saving with rotary screw 20.

Beneficial effects of the present invention: the present invention provides a kind of cast-in-situ box girder shuttering supporting body assembly technology, in particular to Strip footing is made on ground, Bailey bracket combined platform or steel pipe column+Bailey bracket combined platform is then built, as bowl fastening type The bottom of scaffold supports.This support system can reduce basement process area, be particularly suitable for the more complex region of landform, together When reduce steel pipe, the dosages such as bowl buckle part, increase place space, support system is more firm, and bearing capacity is bigger, more saving duration and people Power.On the other hand, it is not influenced, is not influenced by under-clearance by rainy season and misery season, and the higher superiority of headroom is bigger； Based process simple process, it is easy to loading and unloading, construction period is greatly shortened, and stability is higher.

The foregoing examples are only illustrative of the present invention, does not constitute the limitation to protection scope of the present invention, all It is within being all belonged to the scope of protection of the present invention with the same or similar design of the present invention.

Claims (7)

1. a kind of joist of multiple rows of truss assembly, it is characterised in that: including tray (14) and crossbeam (13), tray (14) includes Base body and U-shaped fork (15), are connected between one end and a truss of the crossbeam (13) by pin shaft, and the other end protrudes into the U In type fork (15), U-shaped fork (15) top and bottom end are abutted with the crossbeam (13), the base body of the tray (14) It is connect between another truss by pin shaft.

2. the joist of multiple rows of truss assembly according to claim 1, it is characterised in that: crossbeam (13) is I-steel, institute The web for stating I-steel is inserted into the U-shaped fork (15), and the edge of a wing of the I-steel is abutted with the U-shaped fork (15).

3. the joist of multiple rows of truss assembly according to claim 2, it is characterised in that: at the web of the crossbeam (13) Equipped with hole, peg (16) passes through described hole and abuts with the upper end of the U-shaped fork (15).

4. the joist of multiple rows of truss assembly according to claim 3, it is characterised in that: the end of the U-shaped fork (15) End is equipped with through-hole corresponding with described hole, and the peg (16) passes through the through-hole and hole.

5. the joist of multiple rows of truss assembly according to claim 3, it is characterised in that: the end of the U-shaped fork (15) End is equipped with notch, and the peg (16) is located in the notch.

6. the joist of multiple rows of truss assembly according to claim 1, it is characterised in that: the other end of the crossbeam (13) Equipped with opening, the end of the U-shaped fork (15) is protruded into the opening.

7. the joist of multiple rows of truss assembly according to claim 1, it is characterised in that: the end of the U-shaped fork (15) The section at end is in I-shaped.