CN115324360A - Construction method of large-span suspended truss - Google Patents
Construction method of large-span suspended truss Download PDFInfo
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- CN115324360A CN115324360A CN202210891365.2A CN202210891365A CN115324360A CN 115324360 A CN115324360 A CN 115324360A CN 202210891365 A CN202210891365 A CN 202210891365A CN 115324360 A CN115324360 A CN 115324360A
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- 238000010276 construction Methods 0.000 title claims abstract description 72
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 68
- 239000010959 steel Substances 0.000 claims abstract description 68
- 238000009434 installation Methods 0.000 claims abstract description 56
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims description 24
- 238000013461 design Methods 0.000 description 5
- 210000001503 joint Anatomy 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/342—Structures covering a large free area, whether open-sided or not, e.g. hangars, halls
Abstract
The invention discloses a construction method of a large-span suspended truss, which comprises the following steps: s1, preparing before installation; s2, assembling the segmented truss; s3, arranging a temporary supporting device; s4, installing the segmented truss, the secondary truss and the steel beam; s5, dismantling the temporary supporting device; the installation of the orthogonal truss is realized through the steps, the problem of hoisting of the large-span orthogonal truss structure in construction is solved, the stability of each part structure in the construction process is ensured, the construction efficiency is improved, and the construction process is promoted.
Description
Technical Field
The invention relates to the field of buildings, in particular to a construction method of a large-span suspended truss.
Background
The truss is widely applied to steel structures, and is mainly applied to projects such as roofs (roof trusses and the like), crane beams (namely crane trusses), stations, bridges and the like of industrial and civil buildings. Steel trusses are commonly used as the main members of load-bearing structures, and the steel trusses are most commonly planar trusses which are essentially lattice-type beams under transverse loads. Compared with a solid-web steel beam, the steel truss is characterized in that a chord member replaces a flange and a web member replaces a web plate, and the web member and the chord member are connected with each other at each node through a node plate (or other parts) by welding seams or other connections; the rod pieces can also be directly welded and connected with each other. Thus, the bending moment when the plane truss is bent integrally is expressed by the axial compression and tension of the upper chord and the lower chord, and the shearing force is expressed by the axial compression or tension of each web member. Therefore, the plane truss structure has the advantages of less material consumption, light weight, good toughness and plasticity, strong bearing capacity, convenience for factory manufacture, construction site assembly and the like.
The plane truss is orthogonally installed to form an orthogonal truss, particularly the orthogonal truss with large span is generally constructed by adopting a method of segmented transportation, field ground assembly and then hoisting. In the field construction, a tower crane is mostly adopted for hoisting the steel structure; however, when the large-span orthogonal truss is hoisted, the normal tower crane cannot bear the weight of the large-span orthogonal truss due to large load of the large-span orthogonal truss, and large machinery cannot normally enter construction due to narrow field, so that the large-span orthogonal truss is difficult to hoist, and engineering construction is difficult.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a construction method of a large-span suspended truss, and solve the problem that the construction of a large-span orthogonal truss is difficult.
In order to realize the purpose, the invention adopts the technical scheme that:
a construction method of a large-span suspended truss is used for installing an orthogonal truss in a suspended manner in a building space with a large span, wherein the orthogonal truss comprises a plurality of single trusses arranged in parallel and a plurality of secondary trusses arranged in parallel, the orthogonal truss further comprises steel beams, the single trusses are used for connecting the large-span building, at least most of the secondary trusses are used for connecting adjacent single trusses, and the steel beams are connected with the secondary trusses arranged in parallel; the single trusses comprise segmented trusses connected end to end;
the method comprises the following steps:
s1, arranging a truck crane; the method comprises the following steps of (1) opening a truck-mounted crane channel leading to a building space, driving a truck-mounted crane into the building space through the channel and arranging the truck-mounted crane in the building space, wherein the truck-mounted crane channel is arranged below the installation positions of single trusses, and when the truck-mounted crane channel is hoisted, the truck-mounted crane channel is sequentially hoisted outwards by a first single truss positioned at the innermost end of the truck-mounted crane channel;
s2, assembling the segmented truss; the segmented truss comprises an upper chord, a lower chord and web members; the assembly is realized by connecting the upper chord member and the lower chord member through web members;
s3, arranging a temporary supporting device; the temporary supporting device is used for temporarily supporting the hoisted segmented trusses, and the installation points of the temporary supporting device are arranged in a one-to-one correspondence mode according to the installation points of the segmented trusses;
s4, hoisting the segmented truss and the secondary truss through a truck crane; comprises the following steps which are repeatedly implemented:
(1) A first single truss connected with the first installation wall surface and corresponding lifting of the sub-trusses and the steel beams, comprising
A. Firstly, hanging a first section of segmented truss forming a first single truss to an installation position, wherein one end of the first section of segmented truss is connected with a reserved steel column of the first installation wall surface, and the other end of the first section of segmented truss is temporarily supported on a corresponding temporary supporting device;
B. a plurality of secondary trusses corresponding to the first segmented truss are hung to the installation point, and then the plurality of secondary trusses are connected between the second installation wall surface and the first segmented truss in a mode of being horizontal and perpendicular to the segmented truss;
C. hoisting the rest segmented trusses of the first single truss, hoisting the secondary trusses corresponding to the segmented trusses in the mode of the step B after each segment of segmented trusses is hoisted, and supporting the head ends and the tail ends of the adjacent segmented trusses through the same supporting device; until all the sectional trusses of the first single truss and the corresponding secondary trusses are hoisted; connecting the tail part of the last section of the segmented truss with the head part of the next section of the segmented truss to form a first single truss connected in series, wherein in the first single truss, the tail end of the tail section of the segmented truss is connected with a reserved steel column on a third installation wall surface opposite to the first installation wall surface;
D. hoisting the steel beams to the upper surfaces of the sub-trusses, and installing the steel beams on the upper surfaces of the sub-trusses arranged in parallel to form an orthogonal truss;
(2) Repeating the A-D steps to hoist the other single trusses arranged in parallel with the first single truss and the corresponding secondary trusses and steel beams to form an orthogonal truss; the difference is that the secondary trusses corresponding to the other single trusses are arranged between the adjacent single trusses;
s5, dismantling the temporary supporting device; and after the orthogonal truss is hoisted, removing the temporary supporting device.
Further, the channel is a lower floor slab of the area to be provided with the orthogonal truss after reinforced construction, and a driving channel for the truck crane to enter and exit the construction site after reinforced construction.
Further, the number of dedicated channels is 2.
Further, the assembling of the segmented truss comprises the following steps:
arranging a jig frame on an assembly site; and hoisting the upper chord member and the lower chord member to the jig frame by adopting truck crane hoisting to fix, and then installing the web members from the middle to the two ends.
Further, the temporary supporting device comprises a conversion platform, a supporting frame and a supporting platform which are sequentially arranged from bottom to top; the conversion platform is used for enlarging the stress area of the support frame on the floor slab, and the conversion platform is arranged above the bearing beam.
Furthermore, cushion blocks are arranged below four corners of the conversion platform.
Furthermore, the supporting legs of the truck crane are erected on the roadbed box.
Further, the cross beam on the passage is constructed after the truck crane is driven out of the building space.
The invention has the beneficial effects that:
the invention provides a construction method of a large-span suspended truss, which comprises the steps that after a segmented truss is assembled in an assembling field, a temporary supporting device is arranged at the joint of two segmented trusses through a preset position to serve as temporary support of the segmented truss, and then the segmented truss is sequentially hoisted outwards through a truck crane from a first single truss positioned at the innermost end of a truck crane channel; the problem of hoist and mount difficulty in the construction of quadrature truss is solved. Firstly, hoisting a first section of segmented truss forming a first single truss, and further hoisting a secondary truss corresponding to the segmented truss in order to ensure the stability of the first section of segmented truss in the installation process; and hoisting the rest of the segmented trusses of the first single truss and the secondary truss, connecting the multi-segment trusses end to form the first single truss, and then hoisting the rest of the orthogonal trusses and the corresponding secondary truss. Then, in order to enhance the stability of the structure of the secondary truss, steel beams are arranged on the upper surface of the secondary truss and are hoisted to the upper surface of the secondary truss, and each single steel beam is respectively arranged on the upper surfaces of a plurality of secondary trusses which are arranged in parallel to form an orthogonal truss; the stability of the installation of the orthogonal truss structure is ensured. The installation method solves the problem of hoisting of the large-span orthogonal truss structure in construction, ensures the stability of each part structure in the construction process, improves the construction efficiency and promotes the construction process.
Drawings
FIG. 1 is a construction flow chart of the present invention;
FIG. 2 is a block diagram of the segmented truss of the present invention;
FIG. 3 is a view showing the construction of the supporting device of the present invention;
FIG. 4 is a schematic view of the step A construction in step S4 of the present invention;
FIG. 5 is a schematic view of the step B construction in step S4 of the present invention;
FIG. 6 is a schematic view of the step C construction in step S4 of the present invention;
FIG. 7 is a schematic view of the step D construction in step S4 according to the present invention;
FIG. 8 is a schematic view of the step (2) of the present invention in step S4;
FIG. 9 is a schematic view of the connection between the segmented truss and the wall-surface reserved steel columns according to the present invention;
FIG. 10 is a schematic view of the connection between the segmented truss and the wall-mounted steel columns;
fig. 11 is a schematic view of the connection between the secondary truss and the wall reserved steel column according to the invention.
In the figure: 1. a segmented truss; 101. an upper chord; 102. a web member; 103. a lower chord; 2. a support device; 201. a conversion platform; 202. a support frame; 203. a support platform; 204. cushion blocks; 3. a channel; 4. a truck crane; 5. a first mounting wall; 6. a second mounting wall surface; 7. a third mounting wall surface; 8. a sub-truss; 9. a steel beam; 10. an orthogonal truss; 11. reserving a steel column; 12. a bracket; 13. i-shaped steel.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described with reference to the accompanying drawings. In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Example 1
As shown in fig. 1 to 11, the present embodiment provides a construction method of a large-span suspended truss, which is used for installing an orthogonal truss 10 in a suspended manner in a building space with a large span, wherein the orthogonal truss 10 includes a plurality of single trusses arranged in parallel and a plurality of sub trusses 8 arranged in parallel, the orthogonal truss 10 further includes steel beams 9, the single trusses are used for connecting the large-span building, at least most of the sub trusses 8 are used for connecting adjacent single trusses, and the steel beams 9 are connected to the sub trusses 8 arranged in parallel; the single truss comprises segmented trusses 1 which are connected end to end; the single truss, the sub-truss 8 and the steel beam 9 jointly realize the stability of the structure of the orthogonal truss 10.
The orthogonal truss installation method comprises the following steps:
s1, arranging a truck crane 4; opening a truck-mounted crane 4 channel 3 leading to a building space, driving in the truck-mounted crane 4 through the channel 3 and arranging the truck-mounted crane 4 channel 3 in the building space, and starting to sequentially hoist outwards from a first single truss positioned at the innermost end of the truck-mounted crane 4 channel 3 during hoisting; the truck crane 4 is combined with a tower crane to hoist the segmented truss 1, the sub-truss 8 and the steel beam 9, so that the hoisting problem of the orthogonal truss 10 construction is solved; as a preferred embodiment, a 150t truck crane 4 is adopted, the operating radius is 10m, the main arm length is 29m, and the rated hoisting weight is 40t, so that the hoisting requirements on the segmented truss 1, the secondary truss 8 and the steel beam 9 are met.
S2, assembling the segmented truss 1; the segmented truss 1 comprises an upper chord 101, a lower chord 103 and a web member 102; the assembly is that an upper chord 101 and a lower chord 103 are connected through a web member 102; as a preferred embodiment, the assembly of the segmented truss 1 is completed, the segmented truss 1 is coded, code scanning is carried out on the coded segmented truss 1 and is recorded into a computer system for unified management, when the components are installed, code scanning is carried out again, the condition that the components are not installed is eliminated, and accurate and ordered supply of the components is achieved.
S3, arranging a temporary supporting device 2; the temporary supporting devices 2 are used for temporarily supporting the hoisted segmented trusses 1, and the installation points of the temporary supporting devices 2 are arranged in a one-to-one correspondence mode according to the installation points of the segmented trusses 1; when the sectional truss 1 is installed, the temporary supporting device 2 is arranged as an installation supporting piece, and the structural stability of the sectional truss 1 during installation is guaranteed.
S4, hoisting the segmented truss 1 and the secondary truss 8 through a truck crane 4; comprises the following steps which are repeatedly implemented:
(1) The first single truss connected to the first installation wall 5 and the corresponding sub-truss 8 are hoisted to the steel beam 9, the first installation wall 5 is arranged adjacent to and perpendicular to the second installation wall 6, and the third installation wall 7 is arranged opposite to the first installation wall 5 and adjacent to and perpendicular to the other end of the second installation wall 6. As a preferred embodiment, as shown in fig. 9 to 11, the bracket 12 for mounting the orthogonal truss 10 is provided on each of the first installation wall 5 and the reserved steel column 11 of the third installation wall 7, the end of the orthogonal truss 10 is directly mounted on the bracket 12 or the bracket 12 is provided with the i-shaped steel 13, and the end of the orthogonal truss 10 is connected with the i-shaped steel 13. The second installation wall surface 6 is used for installing a secondary truss 8 installed with a first truss, and as a preferred embodiment, the secondary truss 8 is connected with I-shaped steel 13 arranged on a reserved steel column 11 of the second installation wall surface 6. When the end of the orthogonal truss 10 and the end of the sub-truss 8 are connected with the I-shaped steel 13, the structures are primarily fixed through bolts and then connected through welding and the like. The sub-trusses 8 are connected between the two single trusses by welding or the like. The hoisting of the first single truss and the corresponding secondary truss 8 and steel beam 9 comprises the following steps:
A. firstly, a first-section segmented truss 1 forming a first single truss is hung to an installation point, one end of the first-section segmented truss 1 is connected with a reserved steel column 11 of the first installation wall surface 5, and the other end of the first-section segmented truss is temporarily supported on a corresponding temporary supporting device 2;
B. a plurality of secondary trusses 8 corresponding to the first section of the segmented truss 1 are hung to the installation point, and then the plurality of secondary trusses 8 are connected between the second installation wall surface 6 and the first section of the truss 1 in a mode of being horizontal and perpendicular to the segmented truss 1;
C. hoisting the other segmented trusses 1 of the first single truss, hoisting the secondary truss 8 corresponding to the segmented truss 1 according to the mode of the step B after each segment of the segmented truss 1 is hoisted, ensuring the installation stability of the segmented truss 1, and supporting the head end and the tail end of the adjacent segmented truss 1 through the same supporting device 2; until all the sectional trusses 1 of the first single truss and the corresponding sub-trusses 8 are hoisted; connecting the tail part of the upper section of the segmented truss 1 with the head part of the lower section of the segmented truss 1 to form a first single truss which is connected in series, wherein in the first single truss, the tail end of the tail section of the segmented truss 1 is connected with a reserved steel column 11 on a third installation wall surface 7 opposite to the first installation wall surface 5;
D. hoisting a steel beam 9 to the upper surface of the secondary truss 8, and installing the steel beam 9 on the upper surfaces of the plurality of secondary trusses 8 arranged in parallel to form an orthogonal truss 10; the steel beam 9 is used for increasing the stability between the secondary cross beams, so that the stability of the structure of the overall orthogonal truss 10 is improved, and the construction quality of the project is guaranteed.
(2) Repeating the A-D steps to hoist the other single trusses arranged in parallel with the first single truss and the corresponding secondary truss 8 and steel beam 9 to form an orthogonal truss 10; the difference is that the secondary trusses 8 corresponding to the other single trusses are installed between the adjacent single trusses; it should be noted that the secondary truss 8 corresponding to the last single truss is connected to the adjacent single truss, and the last single truss is also connected to the preset steel structure or the fixed structure at the other end through another group of secondary trusses 8, so as to ensure the installation stability.
S5, dismantling the temporary supporting device 2; after the construction of the orthogonal truss 10 is completed, the temporary support device 2 is removed.
The single trusses are hoisted by the truck crane 4 from inside to outside, the first single truss inside is hoisted firstly until the internal hoisting is finished, the truck crane 4 hoists the secondary internal structure in sequence, the hoisting mode is adopted due to the self-weight of the truck crane 4 and the influence of load on a floor slab, the implementation of engineering is facilitated, and the truck crane 4 needs to hoist the single trusses from inside to outside during construction due to the structure of the truck crane 4 and the laying of the special channel 3 in a construction scene.
Example 2
As shown in fig. 1 to 11, the present embodiment is developed on the basis of the above embodiments, and in particular, the present embodiment provides a construction method of a large-span suspended truss, where the dedicated passageway 3 is a lower floor slab of an area to be installed with an orthogonal truss 10 through reinforcement construction, and the truck crane 4 enters and exits from a construction site through the travel passageway 3 through reinforcement construction. The truck crane 4 drives into the construction area through the special passage 3, and because the self weight of the truck crane 4 is large, and when the truck crane 4 carries out steel structure hoisting, a common floor slab can not support the pressure of the truck crane 4, the special passage 3 needs to be arranged to strengthen the lower floor slab in the area of the orthogonal truss 10 to be installed and the driving passage 3 for the truck crane 4 to pass in and out of the construction site, so that the floor slab can bear the pressure of the truck crane 4 and the hoisting of the truck crane 4.
Further, the number of the dedicated channels 3 is 2, as a preferred embodiment, two trucks 4 can be driven into a construction site from the two transfer channels 3 for standby, and when the orthogonal truss 10 is installed, the two trucks 4 are constructed simultaneously according to a construction method, so that the construction period is shortened, and the construction efficiency is improved.
Further, step S2 includes the steps of:
a jig frame is arranged on an assembling site and used for positioning the sectional truss 1 during assembling; and hoisting the upper chord 101 and the lower chord 103 to the jig frame by adopting a truck crane 4 for hoisting, fixing, and then installing the web members 102 from the middle to the two ends. Specifically, when the segmented truss 1 is assembled, the upper chord member 103 and the lower chord member 103 of the truss are firstly hung, positioning is carried out according to a bed jig bottom line and a segmented positioning line, ear plates are firstly welded at the end part of the main rod of the segmented truss 1 and are temporarily fixed during butt joint, and the ear plates are cut off and ground flat after butt joint. In the butt joint between the upper chord member 103 and the lower chord member 103 of the segmented truss 1, according to design rules, lining pipes are arranged inside the members, and after the member segments are in place, the butt joint device is tightened to fix the main pipes. After the upper chord member 103 and the lower chord member 103 are installed in place, the web members 102 of the segmented truss 1 are assembled, the web members 102 are installed from the middle to two sides when being installed, so that the accumulated errors of assembly can be controlled, in addition, the center line of the jig frame must be fixed when the web members 102 are installed, and intersecting line interfaces cannot be cut and corrected arbitrarily.
Further, the temporary supporting device 2 comprises a conversion platform 201, a supporting frame 202 and a supporting platform 203 which are sequentially arranged from bottom to top; the conversion platform 201 is used for and the conversion platform 201 is arranged above the bearing beam. When the support frame 202 is arranged on a concrete floor, because the bearing capacity of the concrete floor plate cannot meet the stress requirement of the support frame 202, a steel structure conversion platform 201 needs to be arranged at the bottom of the support frame 202, the stress area of the support frame 202 on a floor slab is enlarged, stress acts on a bearing beam, the stress of the floor slab is reduced, and the support platform 203 serves as a support point when the segmented truss 1 is installed.
Furthermore, cushion blocks 204 are arranged below four corners of the conversion platform 201, so that the load of the conversion platform 201 is uniformly distributed, the effect of multiple floors of the support frame 202 is reduced, and the conversion is carried out on the bearing beam below the conversion platform 201.
Furthermore, the supporting legs of the truck crane 4 are erected on the roadbed box, in the hoisting operation process, when the supporting legs fall on a concrete floor slab, the acting force on the floor slab is large, and the floor slab is difficult to bear the load, so that the roadbed box is arranged below the supporting legs, the acting area of the supporting legs is increased, and the concentrated stress condition of the floor slab is reduced.
Further, the beam on the passage 3 is constructed after the truck-crane 4 is driven out of the building space. The crossbeam on the passageway 3 is used for strengthening the stability of passageway 3 structure, but the installation of crossbeam can reduce the height of passageway 3, influences truck crane 4 and normally gos out into and out the building space, consequently need wait to carry out the construction of crossbeam again after truck crane 4 gos out the building space, guarantees the normal development of engineering.
Example 3
As shown in fig. 1 to 11, the present embodiment is developed on the basis of the above embodiments, and specifically, the present embodiment provides a construction method of an orthogonal truss 10 in combination with actual working conditions, before the construction of the orthogonal truss 10, the components are checked according to design drawings, and the data are checked. In addition, in this embodiment, the orthogonal truss 10 is installed in a sectional hoisting construction manner, and the stress condition of the structure is different from that of the original design in a one-time forming state, so that the simulation analysis needs to be performed on the structure construction process to guide the safe implementation of the engineering construction scheme. The engineering adopts MIDAS Information Technology Co, universal finite element analysis software MIDAS/Gen Ver.855 of Ltd company to carry out simulation analysis, thereby ensuring the construction safety. The specific construction method comprises the following steps:
the orthogonal truss 10 comprises a plurality of single trusses arranged in parallel and a plurality of secondary trusses 8 arranged in parallel, the orthogonal truss 10 further comprises steel beams 9, the single trusses are used for connecting a large-span building, at least most of the secondary trusses 8 are used for connecting adjacent single trusses, and the steel beams 9 are connected with the secondary trusses 8 arranged in parallel; the single truss comprises segmented trusses 1 which are connected end to end; in the working condition, the sub-trusses 8 and the steel beams 9 are mainly hoisted by adopting tower cranes, partial tower crane blind areas are installed by adopting automobile cranes 4 in an auxiliary mode, the hoisting weight of part of the sub-trusses 8 and the steel beams 9 exceeds the hoisting range of the tower cranes and also needs to be installed by the automobile cranes 4 in an auxiliary mode, the single trusses are mainly assembled on the ground, and the automobile cranes 4 are hoisted in sections;
the method of installing the orthogonal truss 10 includes the steps of:
s1, preparing before installation; two 150t truck cranes 4 drive into a construction site for standby through two truck crane 4 channels 3; before the channel 3 is arranged, when 150t of truck crane 4 goes to the floor for operation, the floor bearing capacity is checked, an operation area of the truck crane 4 is determined according to a design drawing, the wheel pressure load of the truck crane 4 is taken as a moving load, and the wheel pressure position corresponding to the maximum value of positive (negative) bending moment, shearing force and support counterforce of the plate and the beam is calculated through the influence line of a wheel moving concentrated load group; then, judging the actual station positions of the truck crane 4 corresponding to different indexes (including the maximum values of bending moment and shearing force) of the floor slab and the concrete, calculating the internal force of the floor slab or the concrete beam through a finite element model, and further judging whether the bearing capacity of the floor slab or the concrete beam can meet the standard requirement; if not, a reinforced design is needed, namely, a special channel 3 is arranged.
S2, assembling the segmented truss 1; the segmented truss 1 comprises an upper chord 101, a lower chord 103 and a web member 102; the upper chord 101 and the lower chord 103 are connected through the web member 102; arranging a jig frame on an assembly site; and hoisting the upper chord 101 and the lower chord 103 to the jig frame by adopting a truck crane 4 for hoisting, fixing, and then installing the web members 102 from the middle to the two ends. The segmented truss 1 mainly comprises an upper chord 101, a lower chord 103 and a web member 102, has simple structure, the height of the sectional truss 1 is mainly 2m-3m, thus, a separate split type split heads jig frame is adopted. According to the weight and the size of the assembled blocks, the split heads are 500-800mm high in tire frame, 800mm in beam length, 300 × 300 × 20mm in bottom plate specification, H200 × 8 × 12 in upright rod specification, H200 × 8 × 12 in beam specification, and 12mm in stiffening plates. When the segmented truss 1 is assembled, a total station is used for measuring in an assembling field, the axis of the truss is lofted to the ground, an assembling jig frame is arranged according to the axis position, and the total station is used for rechecking. Assembling the segmented truss 1 in three segments, wherein each segment comprises an upper chord member 103, a lower chord member 103 and a web member 102, assembling the three segments, assembling a first segment of the truss according to the axis position, and rechecking by using a total station; and continuously assembling the second section of the truss. Assembling the third subsection of the truss to complete the assembly of the subsection truss 1; and final measurement and rechecking are carried out after the assembly is finished, so that the assembly quality is ensured.
S3, arranging a temporary supporting device 2; the temporary supporting device 2 is arranged at the joint of the two segmented trusses 1 positioned at the same transverse position and used as a temporary support of the segmented trusses 1; the temporary supporting device 2 comprises a conversion platform 201, a supporting frame 202 and a supporting platform 203 which are arranged in sequence from bottom to top; the conversion platform 201 is used for enlarging the stress area of the support frame 202 on a floor slab, and the conversion platform 201 is arranged above the bearing beam; the conversion platform 201 is a steel structure conversion beam, the conversion beam is supported on a bearing beam, and a 30mm steel plate is arranged between the conversion beam and a concrete beam column so as to make the load distribution of the support frame 202 uneven. The engineering selects the standard support 202 as the support 202 of the temporary support device 2, the support 202 uses every 6m as a standard section, adopts single-chip combination, has the basic combination size of 2.0m multiplied by 2.0m, and can be expanded to any combination with 3m as a modulus. The support frame 202 is composed of three components A, B and C, can be combined and expanded at will according to the needs in construction, and all the components of the support frame are composed of square pipes. The bottom of the support frame 202 is made of a cross beam in a shape like a Chinese character jing, the cross beam is made of HM250 multiplied by 9 multiplied by 14, the top cross beam is made of HM390 multiplied by 300 multiplied by 10 multiplied by 16 and HM480 multiplied by 300 multiplied by 11 multiplied by 18, and all steel materials are made of Q345B;
s4, hoisting the segmented truss 1 and the sub-truss 8 through a truck crane 4; comprises the following steps which are repeatedly implemented:
(1) A first single truss connected with the first installation wall surface 5 and corresponding lifting of the sub-truss 8 and the steel beam 9, comprising
A. Firstly, a first-section segmented truss 1 forming a first single truss is hung to an installation point, one end of the first-section segmented truss 1 is connected with a reserved steel column 11 of the first installation wall surface 5, and the other end of the first-section segmented truss is temporarily supported on a corresponding temporary supporting device 2;
B. a plurality of secondary trusses 8 corresponding to the first section of the segmented truss 1 are hung to the installation point, and then the plurality of secondary trusses 8 are connected between the second installation wall surface 6 and the first section of the truss 1 in a mode of being horizontal and perpendicular to the segmented truss 1;
C. hoisting the rest segmented trusses 1 of the first single truss, hoisting the secondary truss 8 corresponding to the segmented truss 1 according to the mode of the step B after each segment of the segmented truss 1 is hoisted, and supporting the head end and the tail end of the adjacent segmented truss 1 through the same supporting device 2; until all the sectional trusses 1 of the first single truss and the corresponding secondary trusses 8 are hoisted; connecting the tail part of the last section of the segmented truss 1 with the head part of the next section of the segmented truss 1 to form a first single truss which is connected in series, wherein in the first single truss, the tail end of the tail section of the segmented truss 1 is connected with a reserved steel column 11 on a third installation wall surface 7 opposite to the first installation wall surface 5;
D. hoisting a steel beam 9 to the upper surface of the secondary truss 8, and installing the steel beam 9 on the upper surfaces of the plurality of secondary trusses 8 arranged in parallel to form an orthogonal truss 10; the arrangement of the steel beams 9 strengthens the stability among the secondary trusses 8, and improves the stability of the overall structure of the orthogonal truss 10;
(2) Repeating the A-D steps to hoist the other single trusses arranged in parallel with the first single truss and the corresponding secondary truss 8 and steel beam 9 to form an orthogonal truss 10; the difference is that the secondary trusses 8 corresponding to the other single trusses are installed between the adjacent single trusses;
s5, dismantling the temporary supporting device 2; after the construction of the orthogonal truss 10 is completed, the temporary support device 2 is removed.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A construction method of a large-span suspended truss is used for installing an orthogonal truss (10) in a suspended manner in a building space with large span, and is characterized in that: the orthogonal truss (10) comprises a plurality of single trusses arranged in parallel and a plurality of secondary trusses (8) arranged in parallel, the orthogonal truss (10) further comprises steel beams (9), the single trusses are used for connecting a large-span building, at least most of the secondary trusses (8) are used for connecting adjacent single trusses, and the steel beams (9) are connected with the secondary trusses (8) arranged in parallel; the single truss comprises segmented trusses (1) which are connected end to end;
the method comprises the following steps:
s1, arranging a truck crane (4); the method comprises the following steps of (1) opening a truck crane (4) channel (3) leading to a building space, driving the truck crane (4) into the building space through the channel (3) and arranging the truck crane (4) in the building space, setting the truck crane (4) channel (3) below a single truss installation position, and starting to hoist outwards in sequence from a first single truss positioned at the innermost end of the truck crane (4) channel (3) during hoisting;
s2, assembling the segmented truss (1); the segmented truss (1) comprises an upper chord (101), a lower chord (103) and a web member (102); the assembly is realized by connecting an upper chord (101) and a lower chord (103) through a web member (102);
s3, arranging a temporary supporting device (2); the temporary supporting devices (2) are used for temporarily supporting the hoisted segmented trusses (1), and the installation points of the temporary supporting devices (2) are arranged in a one-to-one correspondence mode according to the installation points of the segmented trusses (1);
s4, hoisting the segmented truss (1), the secondary truss (8) and the steel beam (9) through a truck crane (4); comprises the following steps which are repeatedly implemented:
(1) A first single truss connected with a first installation wall surface (5) and hoisting of a corresponding secondary truss (8) and a steel beam (9), comprising
A. Firstly, a first-section segmented truss (1) forming a first single truss is hung to an installation point, one end of the first-section segmented truss (1) is connected with a reserved steel column (11) of a first installation wall surface (5), and the other end of the first-section segmented truss is temporarily supported on a corresponding temporary supporting device (2);
B. a plurality of secondary trusses (8) corresponding to the first section of the segmented truss (1) are hung to the installation point, and then the plurality of secondary trusses (8) are connected between the second installation wall surface (6) and the first section of the truss (1) in a mode of being horizontal and perpendicular to the segmented truss (1);
C. hoisting the rest sectional trusses (1) of the first single truss, hoisting the sub-trusses (8) corresponding to the sectional trusses (1) according to the method of the step B after each section of sectional truss (1) is hoisted, and supporting the head ends and the tail ends of the adjacent sectional trusses (1) through the same supporting device (2); until all the sectional trusses (1) of the first single truss and the corresponding sub trusses (8) are hoisted; connecting the tail part of the upper section of the segmented truss (1) with the head part of the lower section of the segmented truss (1) to form a first single truss which is connected in series, wherein in the first single truss, the tail end of the tail section of the segmented truss (1) is connected with a reserved steel column (11) on a third installation wall surface (7) opposite to the first installation wall surface (5);
D. hoisting the steel beams (9) to the upper surfaces of the sub-trusses (8), and installing the steel beams (9) on the upper surfaces of the sub-trusses (8) which are arranged in parallel to form an orthogonal truss (10);
(2) Repeating the A-D steps to hoist the other single trusses arranged in parallel with the first single truss and the corresponding secondary trusses (8) and steel beams (9) to form an orthogonal truss (10); the difference is that the secondary trusses (8) corresponding to the other single trusses are arranged between the adjacent single trusses;
s5, dismantling the temporary supporting device (2); and after the orthogonal truss (10) is hoisted, removing the temporary supporting device (2).
2. The construction method of the large-span suspended truss according to claim 1, characterized in that: the channel (3) is a lower floor slab of an area to be provided with the orthogonal truss (10) after reinforced construction, and the travelling channel (3) for the truck crane (4) to enter and exit the construction site after reinforced construction.
3. The construction method of the large-span suspended truss according to claim 1, wherein the construction method comprises the following steps: the number of the special channels (3) is 2.
4. The construction method of the large-span suspended truss according to claim 1, wherein the construction method comprises the following steps: the assembling segmented truss (1) comprises the following steps:
arranging a jig frame on an assembly site; and hoisting the upper chord (101) and the lower chord (103) to the jig frame by adopting a truck crane (4) for fixation, and then installing the web members (102) from the middle to the two ends.
5. The construction method of the large-span suspended truss according to claim 1, characterized in that: the temporary supporting device (2) comprises a conversion platform (201), a supporting frame (202) and a supporting platform (203) which are sequentially arranged from bottom to top; the conversion platform (201) is used for enlarging the stress area of the support frame (202) on the floor slab, and the conversion platform (201) is arranged above the bearing beam.
6. The construction method of the large-span suspended truss according to claim 5, wherein the construction method comprises the following steps: cushion blocks (204) are arranged below four corners of the conversion platform (201).
7. The construction method of the large-span suspended truss according to claim 1, characterized in that: and the supporting legs of the truck crane (4) are erected on the roadbed box.
8. The construction method of the large-span suspended truss according to claim 1, wherein the construction method comprises the following steps: and the beam on the channel (3) is constructed after the truck crane (4) is driven out of the building space.
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Cited By (1)
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