CN114837348A - Beam string structure - Google Patents
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- CN114837348A CN114837348A CN202210652234.9A CN202210652234A CN114837348A CN 114837348 A CN114837348 A CN 114837348A CN 202210652234 A CN202210652234 A CN 202210652234A CN 114837348 A CN114837348 A CN 114837348A
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- 229910001294 Reinforcing steel Inorganic materials 0.000 abstract description 2
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- 230000005856 abnormality Effects 0.000 description 1
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- 230000006835 compression Effects 0.000 description 1
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- 238000005034 decoration Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
- E04C3/11—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with non-parallel upper and lower edges, e.g. roof trusses
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Abstract
The invention relates to a beam string structure, which fixes an upper string through an upper string connecting pipe and improves the installation efficiency and the installation precision of the upper string. The upper chord comprises a first upper chord and a second upper chord which are arranged in the same structure, so that the cost is saved, and the installation efficiency is improved. The first upper chord and the second upper chord both comprise a plurality of straight line segments, and the slopes of two adjacent connected straight line segments are arranged in a different mode. The distance between the middle of the first upper chord and the middle of the second upper chord is the farthest, and the distance between the end of the first upper chord and the end of the second upper chord is the closest. A plurality of web members are used to connect the first upper chord to the second upper chord. One end of the stay cable is connected with one group of the upper chord connecting pipes, and the other end of the stay cable is connected with the other group of the upper chord connecting pipes. The upper chord is arranged in an arch shape, so that the span and the clearance can be improved, the cross section of a component can be reduced, the concrete amount and the using amount of reinforcing steel bars are saved, and moreover, anti-floating measures are not needed, the construction is simple and convenient, the speed is high, the construction cost can be saved, and the construction period can be shortened.
Description
Technical Field
The invention relates to the field of building materials, in particular to a beam string structure.
Background
In order to meet the requirements of modern buildings on floor height, dead weight, large space, free space, earthquake resistance and the like, the selection and the arrangement of the floor system not only relate to structural stress, but also have great influence on construction, manufacturing cost and indoor landscape effect. The traditional structure form has higher cost and longer construction period.
It is desirable to provide a beam string structure to solve the above problems.
Disclosure of Invention
The invention relates to a beam string structure, which fixes an upper string through an upper string connecting pipe and improves the installation efficiency and the installation precision of the upper string. The upper chord comprises a first upper chord and a second upper chord which are arranged in the same structure, so that the cost is saved, and the installation efficiency is improved. The first upper chord and the second upper chord respectively comprise a plurality of straight line segments, and the slopes of two adjacent connected straight line segments are arranged in a different mode. The distance between the middle of the first upper chord and the middle of the second upper chord is farthest, and the distance between the end of the first upper chord and the end of the second upper chord is closest. A plurality of web members are used to connect the first upper chord to the second upper chord. One end of the stay cable is connected with one group of the upper chord connecting pipes, and the other end of the stay cable is connected with the other group of the upper chord connecting pipes. The upper chord is arched, so that the span and the clearance can be improved, the cross section of a component can be reduced, the concrete amount and the using amount of a reinforcing steel bar are saved, an anti-floating measure is not required to be adopted, the construction is simple and convenient, the speed is high, the construction cost can be saved, the construction period is shortened, and the problems that the cost is high and the construction period is long due to the adoption of a traditional structural form in the prior art are solved.
In order to solve the above problems, the present invention comprises: a beam string structure, comprising:
two groups of upper chord connecting pipes are arranged, and one end of each upper chord connecting pipe is fixedly connected with the concrete beam column;
the upper chord comprises a first upper chord and a second upper chord, the first upper chord and the second upper chord are arranged in the same structure, the first upper chord and the second upper chord respectively comprise a plurality of straight line segments, and the slopes of two adjacent connected straight line segments are arranged in a different manner; the distance between the middle part of the first upper chord and the middle part of the second upper chord is farthest, and the distance between the end part of the first upper chord and the end part of the second upper chord is nearest;
a plurality of web members for connecting the first upper chord and the second upper chord;
one end of the stay cable is connected with one group of the upper chord connecting pipes, and the other end of the stay cable is connected with the other group of the upper chord connecting pipes; and the number of the first and second groups,
the stay bars are arranged in a plurality and are uniformly distributed between the upper chord and the inhaul cable.
In the beam string structure of the present invention, the first upper chord includes a plurality of first pipe sections, a plurality of second pipe sections, and a plurality of third pipe sections. The second pipe section is arranged in the middle of the first upper chord, one end of the second pipe section is connected with one group of the upper chord connecting pipes through a plurality of the first pipe sections, and the other end of the second pipe section is connected with the other group of the upper chord connecting pipes through a plurality of the third pipe sections. The first pipe section, the third pipe section and the second pipe section are symmetrically arranged. The first pipe section and the first pipe section, the first pipe section and the second pipe section, the second pipe section and the third pipe section, and the third pipe section are connected through welding. The installation is segmented, the installation efficiency is improved, and the transportation is convenient.
Furthermore, the first upper chord is provided with a plurality of fixing blocks and a plurality of fixing plates. The fixing blocks are welded to the end portions of the first pipe section, the second pipe section and the third pipe section respectively, and at least three fixing blocks are arranged at the end portions of the first pipe section, the second pipe section and the third pipe section. The fixing plate is used for connecting the fixing blocks on the two adjacent end parts, so that the two adjacent end parts are tightly connected. The mounting efficiency and the alignment precision of two adjacent pipe sections are improved, and the welding quality is also improved.
Furthermore, a plurality of first bolt holes are formed in the fixing block, a plurality of second bolt holes corresponding to the first bolt holes are formed in the two ends of the fixing plate, and the fixing plate and the fixing block penetrate through bolts to be fixedly connected with the second bolt holes and the first bolt holes, so that the mounting efficiency is improved.
Furthermore, the first upper chord and the second upper chord are of steel pipe structures, and are arranged in a hollow mode, so that the self weight is reduced, and the cost is saved.
Further, the upper chord connecting pipe comprises a first connecting pipe, a second connecting pipe and an ear plate. The first connecting pipe is hollow, a first connecting section is arranged at one end of the first connecting pipe, a first tangent plane inclined to the central axis of the first connecting section is arranged on the side face of the first connecting section, the width of one end, close to the concrete beam column, of the first tangent plane is the largest, and the welding area is increased. The other end of the first connecting pipe is fixedly connected with the first upper chord. The second connecting pipe is arranged the same as the first connecting pipe. The second connecting pipe is provided with a second connecting section, the second connecting section and the first connecting section are arranged correspondingly, and a second tangent plane is arranged on the second connecting section. The first connecting section and the second connecting section are connected through the first tangent plane and the second tangent plane in a welding mode. The other end of the first connecting pipe is separated from the other end of the second connecting pipe, and the other end of the second connecting pipe is connected with the end part of the second upper chord. The upper end of otic placode with first linkage segment second linkage segment welded connection, the lower extreme of otic placode is used for fixed cable. The installation is convenient, can improve the installation effectiveness and the precision of last string.
Furthermore, the area of the end face enclosed by one ends of the first connecting section and the second connecting section, which are close to the concrete beam column, is the same as the area of the end face of the other end of the first connecting pipe, so that the contact area is increased, and the welding quality is improved.
Further, the otic placode includes fixed part and ear, the fixed part presss from both sides and establishes first tangent plane with between the second tangent plane, just two sides of fixed part respectively with first tangent plane the welding of second tangent plane improves bearing strength. One side of ear with the lower extreme of fixed part is connected, the unsettled setting of opposite side of ear practices thrift the cost.
Further, the one end protrusion of fixed part the ear sets up, the tip of the convex one end of fixed plate with concrete beam column welding sets up, improves the bearing strength of fixed part.
Furthermore, the outer diameters of the first connecting pipe and the second connecting pipe are the same as the outer diameter of the upper chord, so that the welding efficiency and the welding quality are improved. The wall thickness of the lower side of the first connecting pipe and the wall thickness of the lower side of the second connecting pipe are 4-6 mm more than that of the upper chord, and cost is saved.
Because the beam string structure is adopted, compared with the prior art, the beam string structure has the beneficial effects that: the invention relates to a beam string structure, which fixes an upper string through an upper string connecting pipe and improves the installation efficiency and the installation precision of the upper string. The upper chord comprises a first upper chord and a second upper chord which are arranged in the same structure, so that the cost is saved, and the installation efficiency is improved. The first upper chord and the second upper chord respectively comprise a plurality of straight line segments, and the slopes of two adjacent connected straight line segments are arranged in a different mode. The distance between the middle of the first upper chord and the middle of the second upper chord is farthest, and the distance between the end of the first upper chord and the end of the second upper chord is closest. A plurality of web members are used to connect the first upper chord to the second upper chord. One end of the stay cable is connected with one group of the upper chord connecting pipes, and the other end of the stay cable is connected with the other group of the upper chord connecting pipes. The upper chord is the arch and sets up and can improve span and headroom, can reduce the component cross-section, saves concrete volume and reinforcing bar quantity, moreover, need not to adopt anti-floating measure, and the construction is simple and convenient, and is fast, can save construction cost, and reduction of erection time has solved among the prior art because of adopting traditional structural style to lead to the problem that the cost is higher and the time limit for a project is longer.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments are briefly introduced below, and the drawings in the following description are only corresponding to some embodiments of the present invention.
Fig. 1 is a schematic structural diagram of an embodiment of a beam string structure according to the present invention.
Fig. 2 is a front view of an embodiment of the upper chord structure of the beam string structure of the present invention.
FIG. 3 is a top view of one embodiment of the winding structure of the present invention.
Fig. 4 is an enlarged schematic view of the a structure of fig. 2.
Fig. 5 is a schematic structural diagram of an embodiment of a winding structure according to the present invention.
Fig. 6 is a front view of one embodiment of an ear plate of the present invention.
Fig. 7 is a front view of an embodiment of the beam string structure of the present invention.
Fig. 8 is a top view of an embodiment of the upper chord of the beam string structure of the present invention.
Fig. 9 is a schematic cross-sectional view of an embodiment of an upper chord of the beam string structure of the present invention.
Fig. 10 is a schematic structural view of an embodiment of the fixing structure of the beam string structure of the present invention.
Fig. 11 is a schematic side view of an embodiment of the beam string structure of the present invention.
Fig. 12 is a front view of an embodiment of the cable of the present invention.
FIG. 13 is a top view of one embodiment of a cable of the present invention.
FIG. 14 is a front view of one embodiment of the cable of the present invention placed on a cable drum.
In the figure: 10. the beam structure comprises a beam structure body, 20 parts of upper chord connecting pipes, 21 parts of first connecting pipes, 211 parts of first cut surfaces, 22 parts of second connecting pipes, 221 parts of second cut surfaces, 23 parts of lug plates, 231 parts of fixing parts, 232 parts of lug parts, 233 parts of flitch plates, 234 parts of inner holes, 235 parts of process holes, 30 parts of upper chords, 31 parts of first upper chords, 32 parts of second upper chords, 33 parts of fixing blocks, 34 parts of fixing plates, 35 parts of mounting seats, 351 parts of mounting plates, 352 parts of support plates, 36 parts of purlins, 37 parts of first pipe sections, 38 parts of second pipe sections, 39 parts of third pipe sections, 40 parts of web members, 50 parts of guy cables, 51 parts of connecting pieces, 52 parts of fixing screws, 53 parts of clamping grooves, 54 parts of screw holes, 55 parts of cable trays, 60 parts of support rods and 70 parts of concrete columns.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the present invention, directional terms such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", "top" and "bottom" are used only with reference to the orientation of the drawings, and the directional terms are used for illustration and understanding of the present invention, and are not intended to limit the present invention.
In the drawings, elements having similar structures are denoted by the same reference numerals.
Referring to fig. 1 and 2, in the present embodiment, the beam string structure 10 includes an upper chord connecting tube 20, an upper chord 30, a web member 40, a pulling cable 50, and a brace 60. Two groups of upper chord connecting pipes 20 are arranged, and one end of each upper chord connecting pipe 20 is fixedly connected with the concrete beam column 70. One end of the upper chord 30 is connected to one set of upper chord nozzles 20 and the other end of the upper chord 30 is connected to another set of upper chord nozzles 20. Web member 40 is located between first upper chord 31 and second upper chord 32. One end of the pulling cable 50 is connected to one group of the upper chord connecting tubes 20, and the other end of the pulling cable 50 is connected to the other group of the upper chord connecting tubes 20. The stay 60 is provided in plural numbers, and is uniformly arranged between the upper chord 30 and the stay 50.
Referring to fig. 2 and 3, in the present embodiment, one end of the upper chord adapter 20 is connected to the concrete beam column 70, and the other end of the upper chord adapter 20 is fixedly connected to the upper chord 30. The upper chord adapter 20 structure includes a first connecting tube 21, a second connecting tube 22, and an ear plate 23. The first connection pipe 21 and the second connection pipe 22 have the same structure, one end of the first connection pipe 21 is connected to one end of the second connection pipe 22, and the other end of the first connection pipe 21 is separated from the other end of the second connection pipe 22. The wall thickness of the first connecting pipe 21 and the wall thickness of the second connecting pipe 22 are both 4mm-6mm more than that of the upper chord 30, and the bearing strength is improved. Experiments show that 5mm can be selected, and the cost can be effectively saved while sufficient bearing capacity is ensured. The outer diameters of the first connecting pipe 21 and the second connecting pipe 22 are the same as the outer diameter of the upper chord 30, so that the welding efficiency and the welding quality are improved. Preferably, referring to fig. 4, the lower portions of the first connecting pipe 21 and the second connecting pipe 22 are used as main load-bearing bodies, the wall thickness of the lower portion can be set to be 5mm more than that of the upper chord 30, and the wall thickness of the upper portion is consistent with that of the upper chord 30, so that the cost can be saved.
In this embodiment, referring to fig. 5, the first connection pipe 21 is hollow, a first connection section is disposed at one end of the first connection pipe 21, a first tangent plane 211 inclined with respect to a central axis of the first connection section is disposed on a side surface of the first connection section, and a width of one end of the first tangent plane 211 close to the concrete beam column 70 is the largest. The second connecting pipe 22 is provided with a second connecting section, the second connecting section is arranged corresponding to the first connecting section, and a second tangent plane 221 is arranged on the second connecting section. The first connection section and the second connection section are welded and connected through the first tangent plane 211 and the second tangent plane 221. The end surface area that first linkage segment and second linkage segment are close to the one end of concrete beam column 70 and surround is the same with the end surface area of the other end of first connecting pipe 21 and sets up, and increase area of contact improves welded quality.
The first cut surface 211 is cut obliquely from the diameter of the first connection section along the length direction of the first connection section, so that the area of the outer circumference of the first connection section is gradually increased, and the area of the first cut surface 211 is gradually decreased. The second cut surface 221 has the same structure as the first cut surface 211, and when welded, the first connection pipe 21 may be disposed apart from the other end of the second connection pipe 22. Meanwhile, the other end of the first connecting pipe 21 and the other end of the second connecting pipe 22 are respectively and fixedly connected with the upper chord 30, and the mounting precision of the upper chord 30 is ensured.
In the present embodiment, referring to fig. 5 and 6, the upper end of the ear plate 23 is welded to the first connecting section and the second connecting section, and the lower end of the ear plate 23 is used for fixing the cable 50. The thickness of the ear plate 23 is set to be 55mm to 65mm, so that the cost is saved. The ear plate 23 includes a fixing portion 231, an ear portion 232 and two attaching plates 233. The fixing portion 231 is sandwiched between the first cut surface 211 and the second cut surface 221, and two side surfaces of the fixing portion 231 are respectively welded with the first cut surface 211 and the second cut surface 221, so that the welding quality and the bearing strength are improved. The upper end of the fixing portion 231 protrudes out of the upper surfaces of the first connecting pipe 21 and the second connecting pipe 22, so that welding is facilitated, and welding efficiency and welding quality are improved.
One side of ear 232 is connected with the lower extreme of fixed part 231, and the unsettled setting of the opposite side of ear 232 practices thrift the cost. The end portion of the one end of the fixing portion 231 protrudes from the ear portion 232, and the end portion of the protruding one end of the fixing plate 34 is welded to the concrete beam column 70, so that the bearing strength of the fixing portion 231 is improved. The ear 232 has an inner hole 234 and a tooling hole 235. An internal bore 234 is provided at the end of the ear 232 adjacent the upper chord 30 and a tooling hole 235 is provided on one side of the internal bore 234 for reducing flash and for aesthetic or convenient tooling. The two panels 233 are respectively arranged on the peripheries of two sides of the inner hole 234, one end of the cable 50 passes through the inner hole 234 to be fixed, and the two panels 233 can improve the bearing strength of the ear 232. The flitch 233 is arranged to be a circular ring structure, so that cost is saved, and the inhaul cable 50 can be prevented from being scratched.
In this embodiment, referring to fig. 7 and 8, the upper chord 30 includes a first upper chord 31 and a second upper chord 32, the first upper chord 31 and the second upper chord 32 are arranged in the same structure, the first upper chord 31 and the second upper chord 32 both include a plurality of straight line segments, and the slopes of two adjacent straight line segments are arranged differently. The distance between the middle part of the first upper chord 31 and the middle part of the second upper chord 32 is farthest, the distance between the end part of the first upper chord 31 and the end part of the second upper chord 32 is closest, and the first upper chord 31 and the second upper chord 32 are arranged in a fish belly shape. The first upper chord 31 and the second upper chord 32 are of steel tube type structures and are arranged in a hollow mode, self weight is reduced, and cost is saved.
Wherein the first upper chord 31 comprises a plurality of first tube segments 37, second tube segments 38 and a plurality of third tube segments 39. A second pipe section 38 is arranged in the middle of the first upper chord 31, one end of the second pipe section 38 being connected to one set of upper chord nozzles 20 via a number of first pipe sections 37, and the other end of the second pipe section 38 being connected to another set of upper chord nozzles 20 via a number of third pipe sections 39. In the present embodiment, the first pipe section 37 and the third pipe section 39 are provided in three according to the actual conditions at the construction site. The first and third pipe sections 37, 39 are arranged symmetrically to the second pipe section 38. The first pipe section 37 and the first pipe section 37, the first pipe section 37 and the second pipe section 38, the second pipe section 38 and the third pipe section 39, and the third pipe section 39 are connected by welding. The installation is segmented, the installation efficiency is improved, and the transportation is convenient. The first pipe section 37, the second pipe section 38 and the third pipe section 39 are all arranged in a linear structure, the adjacent pipe sections are arranged obliquely, and the second pipe section 38 is arranged horizontally, so that the safety and the reliability of foundation bearing are improved. The cross section of the member can be reduced, the concrete quantity is saved, the using amount of the steel bars is reduced, the loss of the template is low, and the vertical decoration cost is saved. The clearance can be improved, the ceiling is not needed, and the sound insulation effect is good. The lengths of the first pipe section 37, the second pipe section 38 and the third pipe section 39 can be the same or different, and the lengths can be determined according to actual conditions on site.
Referring to fig. 9 and 10, the first upper chord 31 is provided with a plurality of fixing blocks 33, a plurality of fixing plates 34 and a plurality of mounting seats 35. The fixing blocks 33 are welded to the ends of the first pipe section 37, the second pipe section 38 and the third pipe section 39, and at least three fixing blocks 33 are arranged at the end of each pipe section. The fixing plate 34 is used for connecting the fixing blocks 33 on two adjacent end portions, so that the two adjacent end portions are tightly connected. The mounting efficiency and the alignment precision of two adjacent pipe sections are improved, and the welding quality is also improved. Wherein, be provided with a plurality of first bolt holes on the fixed block 33, the both ends of fixed plate 34 are provided with a plurality of second bolt holes corresponding with first bolt hole, and fixed plate 34 passes second bolt hole and first bolt hole fixed connection with fixed block 33 through the bolt, improves the installation effectiveness. The mounting seat 35 includes a mounting plate 351 and two support plates 352, the two support plates 352 are respectively mounted at two ends of the mounting plate 351, the mounting plate 351 is welded to the upper surface of the first upper chord 31 or the second upper chord 32, and one end of the support plate 352 away from the mounting plate 351 is welded to the side surface of the first upper chord 31 or the second upper chord 32. A plurality of mounting seats 35 are spaced on the first upper chord 31 and the second upper chord 32 for mounting purlins 36.
Referring to fig. 11, the web members 40 are used for connecting the first upper chord 31 and the second upper chord 32, and the plurality of web members 40 are arranged between the first upper chord 31 and the second upper chord 32 at intervals, so as to improve the stability of the first upper chord 31 and the second upper chord 32. Two ends of the web member 40 are respectively connected with a brace 60, and the two braces 60 and the web member 40 form a triangular structure, so that the support is more stable. The ends of the two struts 60 remote from the web member 40 are provided with clamping cables. The lower ends of the two stay bars 60 are connected with the stay 50 through a cable clamp, one end of the stay 50 is connected with one group of the upper chord connecting tubes 20, and the other end of the stay 50 passes through the cable clamp to be connected with the other group of the upper chord connecting tubes 20. After the tensioning of the inhaul cable 50 is completed, the cable clamping pin shaft is connected with the inhaul cable, so that the inhaul cable 50 is wrapped in the cable clamping pin shaft and the inhaul cable to fix the inhaul cable 50. Due to the arched arrangement of the first upper chord 31 and the second upper chord 32, the length of the brace 60 and the web member 40 on the first pipe section 37 or the third pipe section 39 gradually increases from the end close to the upper chord adapter 20 to the end of the second pipe section 38, and the length of the brace 60 and the web member 40 connected with the two second pipe sections 38 is the longest.
Referring to fig. 12 and 13, two ends of the cable 50 are respectively provided with a connecting member 51 and a fixing screw 52, one end of the connecting member 51 is provided with a slot 53, one end of the slot 53 is open, and two opposite side walls of the slot 53 are respectively provided with a screw hole 54. During installation, the lug part 232 and one end of the attachment plate 233 are located in the clamping groove 53, the two screw holes 54 are arranged opposite to the inner hole 234, one end of the screw rod sequentially penetrates through the screw holes 54, the inner hole 234 and the screw holes 54, and two ends of the screw rod are in threaded connection with two ends of the clamping groove 53, so that the installation efficiency can be improved.
The stay 50 is a hot-extruded polyethylene parallel steel wire stay 50, and the dead load breaking load of the stay 50 is not less than 95% of the nominal breaking load of the cable body. The cable 50 is additionally provided with a double-layer PE, the inner layer is black, and the outer layer is white. The cable making error is plus or minus 15mm when the length of the stay cable 50 is less than or equal to 50000mm, and the cable making error is plus or minus 20mm when the length of the stay cable is more than 50000 mm. Spraying zinc-rich primer after hot spraying zinc on the outer surfaces of the adjustable cable head and the adjustable anchor cup, and plating zinc on the surfaces of the pin shaft, the pin shaft cover plate, the screw rod, the sealing compression ring and the connecting cylinder.
The principles of the present invention are explained in detail below.
In the installation process, the first connecting pipe 21 and the second connecting pipe 22 are positioned, the first connecting pipe 21 is erected to make the first tangent plane 211 face the direction of the second connecting pipe 22, and then the ear plate 23 is placed to make one side surface of the fixing part 231 of the ear plate 23 closely attached to the first tangent plane 211. Then, the second connection pipe 22 is placed at a corresponding position such that the second cut surface 221 is closely attached to the other side surface of the fixing portion 231. Welding and quality detection are carried out according to the construction requirements of the site, and the concrete beam column 70 is hoisted to be installed after the welding and the quality detection are finished.
The fixing blocks 33 are welded to both ends of the first, second and third pipe sections 37, 38 and 39, respectively, and four fixing blocks 33 are welded to each end. The first pipe section 37 is then hoisted into position and the first pipe section 37 and its abutting position are detected. The fixing block 33 of one end of the first pipe section 37 is aligned with the fixing block 33 of one end of the first connecting pipe 21, and is fixedly connected with the bolt by the fixing plate 34, and then the first pipe section 37 and the end of the first connecting pipe 21 are welded. Then another first pipe section 37 is hoisted, the fixing blocks 33 at two adjacent end parts are aligned, and the fixing plates 34 are fixedly connected with the bolts. The remaining first, second and third pipe sections 37, 38, 39 are then installed in the same manner as described above. After the first upper chord 31 and the second upper chord 32 are installed, all the fixing blocks 33 are cut off and the surface of the pipe section is ground flat.
And hoisting the web members 40 according to the measurement positioning and welding connection. And after the support rods 60 and the cable clamps are assembled on the ground, starting hoisting, measuring and positioning the specific parts of the support rods 60 and the cable clamps according to a design drawing, checking whether the axes and the elevations of the support rods 60 and the cable clamps meet the design requirements after hoisting in place, and welding and fixing after retesting is qualified.
Referring to fig. 14, after the cable 50 is transported to a construction site, the place where the cable 50 is placed is cleaned, the cable 50 is taken out and horizontally placed on the mat, and the cable 50 with the cable disc 55 is taken out together with the cable disc 55. When the cable is released in a construction site, the cable 50 is firstly placed on the cable releasing disc 55, then the cable disc 55 is rotated and opened along the reverse direction of the circle of the cable disc 55, and the cable 50 is prevented from being directly and vertically hung when the cable 50 is not opened. Corresponding protective measures are taken for anchors at two ends during hoisting and pulling, and scratching and collision are prevented. The cable 50 is slowly spread along its projected position by using tools such as a truck crane, a hoist, a sling, etc., according to the spatial projection of the cable 50. The stay cable 50 is lifted by three points, and after the stay cable rises gently to the designed elevation, the stay cable is firstly fixed on the lug plates 23 at the two ends through the pin shafts at the two ends of the stay cable 50, and then the cable clamp fixation is completed in sequence from the middle to the two sides. And after the cable is butted, installing a cable head pin shaft, and installing a cable clamp according to the corresponding cable clamp marking line.
And finally, tensioning the stay 50. And finally, tensioning the stay 50. Taking 7 groups of string beams as an example, firstly symmetrically tensioning the string beams at the two most sides, then sequentially symmetrically tensioning the string beams to the middle part, and finally tensioning the string beams at the middle part. The support bed-jig actively takes off the tire without passive unloading, and the tensioning construction is tensioned according to the following steps:
1) step 1: installing secondary structures of the roof, such as an upper chord 30 of the beam string, a stay bar 60, a web member 40 and the like, and a beam string stay cable 50 of the beam string, wherein all supporting jig frames are only contacted with the upper chord 30 and are not welded before tensioning;
2) step 2: pre-tightening the first group of beam string beams and the seventh group of beam string beams, wherein the first group of beam string beams and the seventh group of beam string beams have a graded batch tensioning condition;
3) and 3, step 3: stretching the first group and the seventh group of beam strings in a grading manner of 50% → 80% → 105%;
4) and 4, step 4: synchronously tensioning the second group and the sixth group of beam string beams in a grading manner of 50% → 80% → 105%;
5) and 5, step 5: synchronously tensioning the third group and the fifth group of beam strings in a grading manner of 50% → 80% → 105%;
6) and 6, step 6: synchronously tensioning the fourth group of beam strings in a grading manner of 50% → 80% → 105%;
7) and 7, step 7: and (5) finishing the prestressed construction of the beam string cables and handing over the working face.
The tension of the stay 50 adopts double control indexes of ridge deformation and cable force, the cable force and the extension of the zipper are mainly controlled, and the deformation of a monitoring point is assisted. And immediately measuring and correcting after tensioning is finished. If an abnormality is found, tensioning is suspended, the cause is found out, and after measures are taken, tensioning is continued. The tensioning process is strictly required according to the temperature of 28 +/-2 ℃. The length of the free part of the prestressed steel cable can be used as the original length before tensioning, after tensioning is finished, the length of the original free part is measured again, and the difference between the two is the actual elongation value. Besides the recording of the tension length, the deformation of the steel structure measured by a total station should be recorded so as to monitor the behavior of the structure during construction.
Wherein, the load speed control: because the number of tensioning equipment components is large, the tensioning equipment components must be carefully arranged during installation, and the centroid of the tensioning equipment is overlapped with the steel cable, so that the prestressed steel cable is ensured not to be eccentric during tensioning; and after the oil pump starts to supply oil normally, pressurizing is started, and when the pressure reaches the design tension of the steel cable, the pressurizing is stopped, so that the prestressed steel cable tensioning is completed. And during tensioning, the oil feeding speed is controlled, and the oil feeding time is not less than 0.5 min.
Time control of a tensioning process: the tensioning process needs to be performed in stages. If the first tensioning step 1 (50% cable force), the step subdivides 2 stages, and the interval of each stage is not less than 15 minutes. Namely, when the tensile force reaches 25 percent of the cable force, the suspension is carried out for 15 minutes, and the tension is continued to 50 percent of the cable force after the cable force is stable, so that the first step (50 percent of the cable force) of construction is completed. And tensioning each cable to 105% according to the steps, and completing tensioning of the corresponding cable.
Stress control in a tensioning process: the tensioning jack and the oil pressure gauge are calibrated by a local metering test institute, and the tensioning force can be accurately obtained through the reading of the oil pressure gauge. The tensioning construction should indicate 50 force of each cable tensioning cable and the oil pressure meter reading required to be reached during tensioning, and the meter is used as the basis for construction process recording and tensioning stress control.
In the embodiment, the invention relates to a beam string structure, which fixes an upper string through an upper string connecting pipe, and improves the installation efficiency and the installation precision of the upper string. The upper chord comprises a first upper chord and a second upper chord which are arranged in the same structure, so that the cost is saved, and the installation efficiency is improved. The first upper chord and the second upper chord respectively comprise a plurality of straight line segments, and the slopes of two adjacent connected straight line segments are arranged in a different mode. The distance between the middle of the first upper chord and the middle of the second upper chord is farthest, and the distance between the end of the first upper chord and the end of the second upper chord is closest. A plurality of web members are used to connect the first upper chord to the second upper chord. One end of the stay cable is connected with one group of the upper chord connecting pipes, and the other end of the stay cable is connected with the other group of the upper chord connecting pipes. The upper chord is the arch and sets up and can improve span and headroom, can reduce the component cross-section, saves concrete volume and reinforcing bar quantity, moreover, need not to adopt anti-floating measure, and the construction is simple and convenient, and is fast, can save construction cost, and reduction of erection time has solved among the prior art because of adopting traditional structural style to lead to the problem that the cost is higher and the time limit for a project is longer.
In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.
Claims (10)
1. A beam string structure, comprising:
two groups of upper chord connecting pipes are arranged, and one end of each upper chord connecting pipe is fixedly connected with the concrete beam column;
the upper chord comprises a first upper chord and a second upper chord, the first upper chord and the second upper chord are arranged in the same structure, the first upper chord and the second upper chord respectively comprise a plurality of straight line segments, and the slopes of two adjacent connected straight line segments are arranged in a different manner; the distance between the middle part of the first upper chord and the middle part of the second upper chord is farthest, and the distance between the end part of the first upper chord and the end part of the second upper chord is nearest;
a plurality of web members for connecting the first upper chord and the second upper chord;
one end of the stay cable is connected with one group of the upper chord connecting pipes, and the other end of the stay cable is connected with the other group of the upper chord connecting pipes; and the number of the first and second groups,
the stay bars are arranged in a plurality and are uniformly distributed between the upper chord and the inhaul cable.
2. A beam structure according to claim 1, wherein said first upper chord comprises a plurality of first pipe segments, a second pipe segment and a plurality of third pipe segments, said second pipe segment is disposed at the middle of said first upper chord, one end of said second pipe segment is connected with one group of said upper chord adapter tubes through a plurality of said first pipe segments, and the other end of said second pipe segment is connected with another group of said upper chord adapter tubes through a plurality of said third pipe segments; the first pipe section, the third pipe section and the second pipe section are symmetrically arranged; the first pipe section and the first pipe section, the first pipe section and the second pipe section, the second pipe section and the third pipe section, and the third pipe section are connected through welding.
3. A beam string structure according to claim 2, wherein the first upper chord is provided with a plurality of fixing blocks and a plurality of fixing plates, the plurality of fixing blocks are respectively welded at the end parts of the first pipe section, the second pipe section and the third pipe section, and each end part is provided with at least three fixing blocks; the fixing plate is used for connecting the fixing blocks on the two adjacent end parts, so that the two adjacent end parts are tightly connected.
4. A beam string structure according to claim 3, wherein a plurality of first bolt holes are formed in the fixing block, a plurality of second bolt holes corresponding to the first bolt holes are formed in both ends of the fixing plate, and the fixing plate and the fixing block are fixedly connected to the first bolt holes by bolts passing through the second bolt holes.
5. A beam string structure according to claim 1, wherein said first upper chord and said second upper chord are provided in a steel pipe type structure and are provided hollow inside.
6. The beam string structure according to claim 1, wherein said upper chord receiving tube comprises:
the first connecting pipe is hollow, a first connecting section is arranged at one end of the first connecting pipe, a first tangent plane inclined to the central axis of the first connecting section is arranged on the side surface of the first connecting section, and the width of one end, close to the concrete beam column, of the first tangent plane is the largest; the other end of the first connecting pipe is fixedly connected with the first upper chord;
the second connecting pipe is arranged the same as the first connecting pipe; the second connecting pipe is provided with a second connecting section, the second connecting section is arranged corresponding to the first connecting section, and a second tangent plane is arranged on the second connecting section; the first connecting section and the second connecting section are connected with each other through the first tangent plane and the second tangent plane in a welding mode; the other end of the first connecting pipe is separated from the other end of the second connecting pipe, and the other end of the second connecting pipe is connected with the end part of the second upper chord; and the number of the first and second groups,
the upper end of otic placode with first linkage segment second linkage segment welded connection, the lower extreme of otic placode is used for fixed cable.
7. A beam string structure according to claim 6, wherein the area of the end surface enclosed by the ends of the first connecting section and the second connecting section near the concrete beam column is the same as the area of the end surface of the other end of the first connecting pipe.
8. The beam string structure according to claim 6, wherein said ear plate comprises a fixing portion and an ear portion, said fixing portion is sandwiched between said first cut surface and said second cut surface, and two side surfaces of said fixing portion are welded to said first cut surface and said second cut surface respectively; one side of ear with the lower extreme of fixed part is connected, the unsettled setting of opposite side of ear.
9. A beam string structure according to claim 8, wherein one end of said fixing portion is projected from said ear portion, and an end portion of said projected end of said fixing plate is welded to said concrete beam column.
10. The beam string structure according to claim 6, wherein the first connecting pipe and the second connecting pipe have the same outer diameter as that of the upper string; the lower side wall thickness of the first connecting pipe and the lower side wall thickness of the second connecting pipe are 4mm-6mm more than the wall thickness of the upper chord.
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