CN114108947B - Beam string with stress adjustment function and construction method - Google Patents
Beam string with stress adjustment function and construction method Download PDFInfo
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- CN114108947B CN114108947B CN202111436942.0A CN202111436942A CN114108947B CN 114108947 B CN114108947 B CN 114108947B CN 202111436942 A CN202111436942 A CN 202111436942A CN 114108947 B CN114108947 B CN 114108947B
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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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- 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
- E04C3/10—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal prestressed
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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
- E04G21/12—Mounting of reinforcing inserts; Prestressing
- E04G21/121—Construction of stressing jacks
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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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Abstract
The invention discloses a beam string with stress adjustment and a construction method thereof. The invention can realize the internal force balance of the stay cable at the connection part, reduce the abrasion of the stay cable and improve the in-plane stability of the beam string structure by automatically adjusting the connection position of the stay rod on the stay cable in the installation and use stages of the beam string structure.
Description
Technical Field
The invention relates to the technical field of buildings, in particular to a beam string capable of automatically controlling the position and stress of a support rod and a construction method.
Background
The beam structure of the string stretching beam is light in dead weight and large in span and rigidity, and becomes a novel large-span structure system which is rapidly developed in recent years. The beam string structure is mainly applied to buildings such as large-span gymnasiums, airport terminal buildings, exhibition halls, waiting halls of railway stations, rain sheds of platforms and the like.
In the tensioning construction process of the beam string structure, the stay bar freely slides on the stay cable, after the stay bar is fixed with a stay cable connection point, the left and right stress of the stay cable at the stay bar connection point is unbalanced, the stay cable is easy to wear, the stay bar is pushed to adjust the stay bar and stay cable connection point by manual operation, the operation is difficult, the operation precision is low, and the stress balance of the stay cable at the two sides of the stay bar connection point cannot be ensured; the string beam structure of opening is in the use stage, and under wind and the vibration loading effect, structure vibration amplitude is big, and vaulting pole and cable atress produce the change, and it is uneven in both sides atress distribution about the junction point department, and the prestressing force loss increase of string beam structure of opening, later stage engineering maintenance requires highly.
Disclosure of Invention
Aiming at the defects, the invention provides the tension string beam with stress adjustment and the construction method thereof.
The technical scheme of the invention is as follows: the utility model provides a stretch string roof beam with stress adjustment, includes last string girder, cable, vaulting pole, the cable both ends are connected with last string girder both ends respectively, and the vaulting pole has a plurality ofly, and the vaulting pole all sets up between last string girder and cable, vaulting pole and last string girder swing joint set up stress adjustment mechanism between vaulting pole bottom and cable. The stress adjusting mechanism is used for realizing the internal force balance at the joint of the stay bar and the inhaul cable.
The top end of the stay bar is provided with a top connecting node which is movably connected with a connecting plate at the lower part of the upper chord main beam, so that the stay bar can rotate conveniently.
The bottom end of the stay bar is connected with the stay cable through a clamp plate pulley node, the clamp plate pulley node comprises an upper fixing component and a lower clamp plate, the upper fixing component is detachably connected with the lower clamp plate, the top of the upper fixing component is fixed with the bottom end of the stay bar, a cavity is arranged in the upper fixing component, a pulley is arranged in the cavity, horizontal notches are arranged on the upper fixing component bodies on two sides of the cavity, and the horizontal notches and the pulley are on the same straight line; lower part splint are the syllogic structure, and the both ends of lower part splint are horizontal segment splint, and the centre is concave section splint, sets up notch down along splint length direction on lower part splint, notch and horizontal notch cooperation form the cable passageway down. The stay cable channel is convenient for the stay cable to pass through, and the stay rod is connected with the stay cable. The pulley can play the effect that rolls when removing the vaulting pole and support, avoids the rigid pull damage between cable and the upper portion fixed body.
The bolt holes are formed in two sides of the lower notch of the horizontal section clamping plate, the bolt holes are formed in two sides of the horizontal notch, the bolt holes of the horizontal section clamping plate correspond to the bolt holes of the upper fixing component one to one, after the stay rod reaches a specified position, the upper fixing component and the lower clamping plate are fixed through the bolt holes, namely, the horizontal section clamping plate of the lower clamping plate is fixed with the upper fixing component, the fixing purpose of the stay rod and the stay cable is achieved, and when the stay rod is fixed, due to the concave section clamping plate, the pulley cannot be extruded.
Set up the slope notch at horizontal notch outer end, and the direction slope of cable is kept away from to the slope notch, and the axis of slope notch and horizontal notch is unanimous. Thus, the notch can be ensured to be consistent with the direction of the stay cable.
The heights of the horizontal notch and the lower notch are both smaller than the radius of the inhaul cable, and the widths of the horizontal notch and the lower notch are larger than the radius of the inhaul cable, so that the inhaul cable can be placed conveniently; all be equipped with gear form arch on horizontal notch and lower notch inner wall, increase the frictional force with the cable contact. The bolt hole all is equipped with the gear form arch with unilateral bolt screw thread interlock mutually, increases unilateral bolt's pretightning force.
One end of the stress adjusting mechanism is movably connected with the bottom of the supporting rod through a side connecting node, the other end of the stress adjusting mechanism is movably connected with the stay cable fixer, the stress adjusting mechanism comprises a hydraulic oil cylinder and a pressure sensor, a piston rod of the hydraulic oil cylinder is connected with the side connecting node through the pressure sensor, an inner end plate is arranged in a rod body of the hydraulic oil cylinder, the inner end plate divides the inside of the hydraulic oil cylinder into two cavities, two oil nozzles with switches are arranged on the hydraulic oil cylinder, and the two oil nozzles are respectively communicated with the two cavities. Two oil nozzles are communicated with an oil pump, the piston rod can be pushed out or pulled back through oil supply and oil cut-off, the stay bar is adjusted, the final value of the pressure sensor is zero, the pressure sensor is adjusted in place, then the stress adjusting mechanism can buffer and adjust the force between the stay bar and the stay rope during subsequent use, and the two ends of the stress adjusting mechanism are movably connected, so that the stress adjusting mechanism is convenient to maintain and replace later.
The cable fixer comprises a connecting plate with a round hole, a hydraulic oil cylinder is movably connected with the connecting plate through the round hole, a fixed clamping piece used for clamping a cable is fixed at the bottom of the connecting plate and comprises an upper fixed clamping piece and a lower fixed clamping piece, a channel used for the cable to pass through is arranged between the upper fixed clamping piece and the lower fixed clamping piece, the upper fixed clamping piece and the lower fixed clamping piece are fixed through bolts, and the upper fixed clamping piece and the lower fixed clamping piece can be fixed with the cable.
A construction and installation method of a beam string with stress adjustment comprises the following steps:
A. the support installed in the pre-embedded beam string structure comprises a fixed hinged support and a horizontal slidable hinged support, wherein the sliding range of the horizontal slidable hinged support is designed according to the horizontal moving distance of the upper chord main beam arched rear support;
B. installing a top chord main beam, assembling the top chord main beam on the temporary support frame, and connecting the top chord main beam with the support;
C. installing a stay bar, wherein a connecting plate used for being connected with the stay bar is preassembled on the upper chord main beam, and the connecting plate is connected with a connecting node corresponding to the stay bar and is fixedly connected by a pin shaft;
D. hanging a stay cable, wherein one end of the stay cable is fixed at the end part of an upper chord main beam at the fixed support, and the stay cable is connected with a clamp plate pulley node at the lower end of the stay rod;
E. tensioning a stay cable, wherein a jack is arranged at one end of the stay cable close to the sliding hinged support, the stay cable is tensioned by the jack, after the tension design stress is reached, the stay cable end is fixed at one end of the upper chord main beam close to the sliding support, at the moment, the end part of the upper chord main beam slides inwards at the sliding support, and the support at the sliding support is fixed to be changed into a fixed support;
F. installing a stress adjusting mechanism and a stay cable fixer, installing the stay cable fixer at a position of the stay cable close to the stay rod, fixing clamping pieces up and down to clamp the stay cable and screwing a bolt tightly, and connecting nodes at two sides of the stress adjusting mechanism are respectively connected with the stay rod and the connecting nodes of the stay cable fixer by pin shafts;
G. is connected with an electric hydraulic oil pump. Observing a pressure sensor of the stress adjusting mechanism, if the numerical value is positive, the stress adjusting mechanism is pressed, the length of the stress adjusting mechanism needs to be shortened, an oil outlet pipe of the electric hydraulic oil pump is connected with a first oil nozzle of the stress adjusting mechanism, a connecting switch is opened, an oil return pipe of the electric hydraulic oil pump is connected with a second oil nozzle of the stress adjusting mechanism, and the connecting switch is opened; observing a pressure sensor of the stress adjusting mechanism, when the numerical value is negative, the stress adjusting mechanism is pulled, the length of the stress adjusting mechanism needs to be extended, an oil outlet pipe of the electric hydraulic oil pump is connected with a second oil nozzle of the stress adjusting mechanism, a connecting switch is opened, an oil return pipe of the electric hydraulic oil pump is connected with the first oil nozzle of the stress adjusting mechanism, and the connecting switch is opened;
H. the oil pump applies pressure, hydraulic oil is pressed into the oil cylinder, the piston rod is pushed in when the initial value of the pressure sensor is positive, and the stress adjusting mechanism is shortened; when the initial value of the pressure sensor is negative, the piston rod is pushed out, the numerical value of the pressure sensor and the output pressure of the electric hydraulic oil pump are synchronously monitored, and when the numerical value of the pressure sensor is reduced to zero, oil is stopped being added into the hydraulic oil cylinder;
I. closing a switch of a connection port of a hydraulic oil cylinder nozzle and an oil outlet pipe and an oil return pipe of the electric hydraulic oil pump, and withdrawing the electric hydraulic oil pump;
J. sequentially adjusting the lengths of other stress adjusting mechanisms and adjusting the connecting position of the stay bar on the stay cable;
K. the lower clamping plate is fixed by screwing the single-side bolt;
l, dismantling the temporary support frame to finish the installation of the beam string.
In the step F, the included angle between the stay bar and the stress adjusting mechanism is kept at 90 degrees, the horizontal force of the stay rope at the lower end of the stay bar can be accurately measured by the pressure sensor of the stress adjusting mechanism, and whether the horizontal force at the left and right of the stay rope is offset or not is judged.
In step D, when the inhaul cable passes through the lower end of the stay bar, the upper fixing component and the lower clamping plate are fixed through the unilateral bolt but do not clamp the inhaul cable, so that the inhaul cable is in contact with the pulley, and the inhaul cable can slide. And (D) after the step (H) is finished, tightening the single-side bolt to clamp the inhaul cable by the upper fixing component and the lower clamping plate. Since the upper fixing member and the lower clamping plate are fixed by the unilateral bolt at the beginning, the stay cable is prevented from being separated from the stay bar when the stay cable slides.
Through the above description, it can be seen that the problems that the position of the stay bar of the beam string structure cannot be automatically and accurately adjusted in the construction and use stages, the left and right stress of the stay rope at the joint of the stay bar is unbalanced, and the like are solved, and compared with the prior art, the invention has the beneficial effects that: 1. reducing the prestress loss: the prestress generated by tensioning the inhaul cable is maximally transmitted to the upper chord beam through the stay bar by adjusting the position of the stay bar connected with the inhaul cable. 2. And (3) increasing the stability in the plane of the beam string: when the stay bars are adjusted to the condition that the internal force of the stay ropes on the two sides is consistent with the vertical direction of the stay bars, the stay bars are in a balanced state, and the stay bars are kept stable in the plane of the beam string structure. 3. Reduce the frictional force between cable and vaulting pole: the stay bar and cable junction set up splint pulley node, and cable tensioning in-process cable and pulley contact reduce the frictional force of stay bar and cable junction, reduce the loss of the component of junction, tighten unilateral bolt fastening cable after cable tensioning is accomplished, simple to operate. 4. The construction efficiency is improved: the stress adjusting mechanism can be automatically switched on, the length of the device is changed by pumping hydraulic oil into the electric hydraulic oil pump, the operation is convenient, the labor force is reduced, and the construction efficiency is improved. 5. Adjusting the support position of the support rod in real time: by observing the numerical value of the pressure sensor of the stress adjusting mechanism, the supporting position of the supporting rod is adjusted in real time, the beam string structure is always kept in a stable state, and the service life of the structure is prolonged. 6. The material consumption is less: the stress adjusting mechanism is detachable from the inhaul cable fixing device, and monitoring and position adjustment of a plurality of support rods can be completed by one stress adjusting mechanism.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only one embodiment of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a schematic view of the beam string of the present invention.
Fig. 2 is a schematic view of the installation of the stay and the stress adjustment mechanism of the present invention.
Fig. 3 is a schematic view of a stress adjustment mechanism according to the present invention.
Fig. 4 is a diagram of a connection node structure of the present invention.
Fig. 5 is a side view of fig. 4.
Fig. 6 is a top view of fig. 4.
FIG. 7 is a schematic diagram of the position of the front and rear supports of the beam string structure according to the present invention.
FIG. 8 is a schematic view of a cable retainer of the present invention.
Fig. 9 is a side view of fig. 8.
Fig. 10 is a top view of fig. 8.
Fig. 11 is a schematic view of a cleat sheave node of the present invention.
Figure 12 is a schematic view of the cleat sheave node installation of the present invention.
Figure 13 is a schematic view of the upper stationary member of the cleat pulley node of the present invention.
Fig. 14 is a lower cleat illustration of the cleat pulley node of the present invention.
Shown in the figure: 1. a stress adjusting mechanism 11, a connecting node 111, a round hole 112, a connecting plate 113, a connecting end plate 12, a pressure sensor 13, a piston rod 131, an outer end plate 132, an inner end plate 14, a hydraulic cylinder 141, a front end plate 15, a first oil nipple 16, a second oil nipple 2, a stay rod 21, a top connecting node 211, a fixing round hole 212, a fixing connecting plate 213, a fixing end plate 22, a steel pipe stay rod 24, a connecting node 3, a cable holder 31, a connecting plate 32, a fixing clip 33, a round hole 34, a bolt 4, a cable, 5, an upper main beam 6, a clip pulley node 61, an upper fixing member 611, an outer shroud, 612, a pulley 613, a horizontal notch 614, an inclined notch 615, an upper bolt hole 62, a lower clip 621, a horizontal segment clip 622, a lower concave segment clip 623, a lower notch, 624. lower bolt hole, 63, unilateral bolt.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, and is not intended to limit the present invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
According to the scheme, the beam string in the embodiment comprises an upper string main beam 5, a plurality of stay bars 2 and a stay cable 4, wherein two ends of the stay cable 4 are respectively connected with two ends of the upper string main beam 5, the stay bars 2 are arranged between the upper string main beam 5 and the stay cable 4, the stay bars 2 are movably connected with the upper string main beam 5, and a stress adjusting mechanism 1 is arranged between the bottom of the stay bars 2 and the stay cable 4.
The top end of the stay bar 2 is provided with a top connecting node 21, and the top connecting node 21 is movably connected with a connecting plate at the lower part of the upper chord main beam 5; the bottom end of the stay bar 2 is connected with the stay cable 4 through a splint pulley node 6, the splint pulley node 6 comprises an upper fixing member 61 and a lower splint 62, the upper fixing member 61 and the lower splint 62 are fixedly adjusted through a single-side bolt 63, the upper fixing member 61 is detachably connected with the lower splint 62, the top of the upper fixing member 61 is fixed with the bottom end of the stay bar, a cavity is arranged in the upper fixing member 61, an external enclosing plate 611 is arranged around the cavity, a pulley 612 is arranged in the cavity, horizontal notches 613 are arranged on the upper fixing member body 61 at two sides of the cavity, and the horizontal notches 613 and the pulley 612 are on the same straight line; the lower clamping plate 62 is of a three-section structure, the two ends of the lower clamping plate 62 are horizontal section clamping plates 621, the middle of the lower clamping plate 62 is a concave section clamping plate 622, a lower notch 623 is arranged on the lower clamping plate 62 along the length direction of the clamping plate, and the lower notch 623 and the horizontal notch 613 are matched to form a cable channel. Lower bolt holes 624 are arranged on two sides of the lower notch of the horizontal segment clamping plate, upper bolt holes 615 are arranged on two sides of the horizontal notch 613, and the lower bolt holes 624 of the horizontal segment clamping plate correspond to the upper bolt holes 615 of the upper fixing component in a one-to-one mode. An inclined notch 614 is provided at the outer end of the horizontal notch 613, and the inclined notch 614 is inclined away from the direction of the cable, the inclined notch 614 coinciding with the axis of the horizontal notch 613. The heights of the horizontal notch and the lower notch are both smaller than the radius of the inhaul cable, the widths of the horizontal notch and the lower notch are larger than the radius of the inhaul cable, gear-shaped bulges are arranged on the inner walls of the horizontal notch and the lower notch,
stress adjustment mechanism 1's one end is through side connected node 24 and vaulting pole 2 bottom swing joint, and side connected node 24 includes fixed end plate 213, fixed connecting plate 212, fixed round hole 211, and fixed round hole 211 sets up on fixed connecting plate 212, and fixed round hole 211 is used for passing round pin axle and hydraulic cylinder 14 swing joint, and in this embodiment, each connected node's structure is the same. The other end of the stress adjusting mechanism 1 is movably connected with the inhaul cable fixer 3, the stress adjusting mechanism 1 comprises a hydraulic oil cylinder 14 and a pressure sensor 12, a piston rod 13 of the hydraulic oil cylinder 14 is connected with a side connecting node through the pressure sensor 12, the piston rod 13 is internally provided with an inner end plate 132 in a rod body of the hydraulic oil cylinder, the inner end plate 132 divides the interior of the hydraulic oil cylinder into two cavities, the hydraulic oil cylinder is provided with two oil nipples 15 and oil nipples 16 with switches, the two oil nipples are respectively communicated with the two cavities, a hole is formed in the middle of a front end plate 141 at one end of the hydraulic oil cylinder 14 and used for penetrating through the piston rod 13, oil can not leak from the hole of the front end plate 141, the piston rod 13 is inserted into the hydraulic oil cylinder 14 from the front end plate 141 of the hydraulic oil cylinder 14, the inner end plate 132 is used for blocking the internal space of the hydraulic oil cylinder 14, the inner end plate 132 rubs against the inner wall of the hydraulic oil cylinder 14 when the piston rod 13 moves, and the inner end plate 132 ensures that hydraulic oil on two sides can not flow through each other, the other end of the piston rod 13 is connected with a pressure sensor 12 through an outer end plate 131, the pressure sensor 12 is fixed on a connecting end plate 113 of the connecting node 11, the connecting node 11 of the stress adjusting mechanism 1 is connected with a connecting node 24 on the side edge of the stay bar 2 through a pin shaft, and the connecting node 11 at the other end is connected with the stay cable fixer 3 through a pin shaft. The moving range of the inner end plate 132 is the distance between the oil nipple 15 and the oil nipple 16 on the side wall of the hydraulic cylinder 14, and is the range of the stress adjustment mechanism 1. If the stress adjusting mechanism 1 operates to adjust the position of the stay bar 2, the range of the stress adjusting mechanism 1 is insufficient, and the stress adjusting mechanism 1 is operated again after the position of the stay cable fixer 3 on the stay cable 4 is adjusted.
The cable fixer 3 comprises a connecting plate 31 with a round hole 33, the hydraulic oil cylinder 14 is movably connected with the connecting plate 31 through the round hole 33, a fixed clamping piece 33 used for clamping the cable is fixed at the bottom of the connecting plate 31 and comprises an upper fixed clamping piece and a lower fixed clamping piece, a channel used for the cable to pass through is arranged between the upper fixed clamping piece and the lower fixed clamping piece, and the upper fixed clamping piece and the lower fixed clamping piece are fixed through a bolt 34.
The construction and installation method for the beam string is characterized by comprising the following steps:
A. the support installed in the pre-embedded beam string structure comprises a fixed hinged support and a horizontal slidable hinged support, wherein the sliding range of the horizontal slidable hinged support is designed according to the horizontal moving distance of the upper chord main beam arched rear support;
B. installing an upper chord main beam 5, assembling the upper chord main beam 5 on the temporary support frame, and connecting the upper chord main beam 5 with the support;
C. installing a stay bar, wherein a connecting plate used for being connected with the stay bar is preassembled on the upper chord main beam, and the connecting plate is connected with a top connecting node corresponding to the stay bar and is fixedly connected by a pin shaft;
D. hanging a stay cable 4, fixing one end of the stay cable 4 at the end part of an upper chord main beam 5 at a fixed support, and connecting the stay cable 4 with a clamp plate pulley node at the lower end of a stay bar;
E. tensioning a stay cable 4, wherein a jack is arranged at one end of the stay cable 4 close to the sliding hinged support, the stay cable 4 is tensioned by the jack, after the tension design stress is reached, the stay cable end is fixed at one end of the upper chord main beam close to the sliding support, at the moment, the end part of the upper chord main beam 5 slides inwards at the sliding support, and the support at the sliding support is fixed to be changed into a fixed support;
F. installing a stress adjusting mechanism 1 and a stay cable fixer 3, installing the stay cable fixer 3 at the position of a stay cable 4 close to a stay rod 2, clamping the stay cable 4 by a fixed clamping piece 32 and screwing a bolt 34, and connecting nodes at two sides of the stress adjusting mechanism 1 are respectively connected with the stay rod 2 and the stay cable fixer 3 by pin shafts; the included angle between the stay bar 2 and the stress adjusting mechanism 1 is kept at 90 degrees, the horizontal force of the stay bar at the lower end of the stay bar can be accurately measured by the pressure sensor 12 of the stress adjusting mechanism, and whether the horizontal force is offset or not at the left and right of the stay bar is judged.
G. Connecting an electric hydraulic oil pump; observing a pressure sensor 12 of the stress adjusting mechanism 1, if the numerical value is positive, the stress adjusting mechanism is pressed, the length of the stress adjusting mechanism 1 needs to be shortened, an oil outlet pipe of the electric hydraulic oil pump is connected with a first stress adjusting mechanism oil nozzle 15, a connecting switch is opened, an oil return pipe of the electric hydraulic oil pump is connected with a second stress adjusting mechanism oil nozzle 16, and the connecting switch is opened; observing a pressure sensor 12 of the stress adjusting mechanism, when the numerical value is negative, the stress adjusting mechanism 1 is pulled, the length of the stress adjusting mechanism needs to be extended, an oil outlet pipe of the electric hydraulic oil pump is connected with a second oil nozzle 16 of the stress adjusting mechanism, a connecting switch is opened, an oil return pipe of the electric hydraulic oil pump is connected with a first oil nozzle 15 of the stress adjusting mechanism, and the connecting switch is opened;
H. the oil pump applies pressure, hydraulic oil is pressed into the hydraulic oil cylinder 14, the piston rod 13 is pushed in when the initial value of the pressure sensor 12 is positive, and the stress adjusting mechanism 1 is shortened; when the initial value of the pressure sensor 12 is negative, the piston rod 13 is pushed out, the numerical value of the pressure sensor and the output pressure of the electric hydraulic oil pump are synchronously monitored, and when the numerical value of the pressure sensor 12 is reduced to zero, oil is stopped being added into the hydraulic oil cylinder 14;
I. closing a switch of a connection port of a hydraulic oil cylinder nozzle and an oil outlet pipe and an oil return pipe of the electric hydraulic oil pump, and withdrawing the electric hydraulic oil pump;
J. sequentially adjusting the lengths of other stress adjusting mechanisms and adjusting the connecting position of the stay bar on the stay cable;
K. the lower clamping plate is fixed by screwing the single-side bolt;
l, dismantling the temporary support frame to finish the installation of the beam string.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (8)
1. The utility model provides a stretch string roof beam with stress modulation, includes last string girder (5), cable (4), vaulting pole (2), cable (4) both ends are connected with last string girder (5) both ends respectively, and vaulting pole (2) have a plurality ofly, and vaulting pole (2) all set up between last string girder (5) and cable (4), its characterized in that: the stay bar (2) is movably connected with the upper chord main beam (5), and a stress adjusting mechanism (1) is arranged between the bottom of the stay bar (2) and the stay cable (4);
one end of the stress adjusting mechanism (1) is movably connected with the bottom of the supporting rod (2) through a side connecting node (24), the other end of the stress adjusting mechanism (1) is movably connected with the inhaul cable fixer (3), the stress adjusting mechanism (1) comprises a hydraulic oil cylinder (14) and a pressure sensor (12), a piston rod (13) of the hydraulic oil cylinder (14) is connected with the side connecting node (24) through the pressure sensor (12), an inner end plate (132) is arranged in a rod body of the hydraulic oil cylinder by the piston rod (13), the inner end plate (132) divides the interior of the hydraulic oil cylinder (14) into two cavities, two oil nipples with switches are arranged on the hydraulic oil cylinder, and the two oil nipples are respectively communicated with the two cavities;
cable fixer (3) including connecting plate (31) that have round hole (33), hydraulic cylinder (14) pass through round hole (33) and connecting plate (31) swing joint, fixed clamping piece (32) that are used for pressing from both sides tight cable are fixed to connecting plate (31) bottom, fixed clamping piece (32) are including last fixed clamping piece and lower fixed clamping piece, are provided with the channel that is used for cable (4) to pass between the fixed clamping piece from top to bottom, the fixed clamping piece passes through the bolt fastening from top to bottom.
2. Beam string with stress modulation according to claim 1,
the top end of the stay bar (2) is provided with a top connecting node (21), and the top connecting node (21) is movably connected with a connecting plate at the lower part of the upper chord main beam (5).
3. Beam string with stress adjustment according to claim 1 or 2,
the bottom end of the stay bar (2) is connected with the stay cable (4) through a splint pulley node (6), the splint pulley node (6) comprises an upper fixing component (61) and a lower splint (62), the upper fixing component (61) is detachably connected with the lower splint (62), the top of the upper fixing component (61) is fixed with the bottom end of the stay bar (2), a cavity is arranged in the upper fixing component (61), a pulley (612) is installed in the cavity, horizontal notches (613) are formed in the upper fixing component bodies on two sides of the cavity, and the horizontal notches (613) and the pulley (612) are on the same straight line; lower part splint (62) are the syllogic structure, and the both ends of lower part splint (62) are horizontal segment splint (621), and the centre is concave segment splint (622), sets up notch (623) down along splint length direction on lower part splint (62), notch (623) and horizontal notch (613) cooperation form the cable passageway down.
4. Beam string with stress modulation according to claim 3,
bolt holes are arranged on two sides of a lower notch (623) of the horizontal section clamping plate, bolt holes are arranged on two sides of a horizontal notch (613), and the bolt holes of the horizontal section clamping plate correspond to the bolt holes of the upper fixing component one by one.
5. Beam string with stress modulation according to claim 4,
an inclined notch (614) is arranged at the outer end of the horizontal notch (613), the inclined notch (614) is inclined away from the direction of the inhaul cable (4), and the axis of the inclined notch is consistent with that of the horizontal notch.
6. Beam string with stress modulation according to claim 4,
horizontal notch (613) and lower notch (623) height all are less than the cable radius, and the notch width of horizontal notch and lower notch is greater than the cable radius, all is equipped with gear form arch on horizontal notch (613) and lower notch (623) inner wall.
7. A construction installation method for a beam string with stress adjustment as claimed in claim 1, 2, 3, 4, 5 or 6, characterized by comprising the steps of:
A. the support installed in the pre-embedded beam string structure comprises a fixed hinged support and a horizontal slidable hinged support, wherein the sliding range of the horizontal slidable hinged support is designed according to the horizontal moving distance of the upper chord main beam arched rear support;
B. installing a top chord main beam, assembling the top chord main beam on the temporary support frame, and connecting the top chord main beam with the support;
C. installing a stay bar, wherein a connecting plate used for being connected with the stay bar is preassembled on the upper chord main beam, and the connecting plate is connected with a top connecting node corresponding to the stay bar and is fixedly connected by a pin shaft;
D. hanging a stay cable, wherein one end of the stay cable is fixed at the end part of an upper chord main beam at the fixed support, and the stay cable is connected with a clamp plate pulley node at the lower end of the stay rod;
E. tensioning a stay cable, wherein a jack is arranged at one end of the stay cable close to the sliding hinged support, the stay cable is tensioned by the jack, after the tension design stress is reached, the stay cable end is fixed at one end of the upper chord main beam close to the sliding support, at the moment, the end part of the upper chord main beam slides inwards at the sliding support, and the support at the sliding support is fixed to be changed into a fixed support;
F. installing a stress adjusting mechanism and a stay cable fixer, installing the stay cable fixer at a position of the stay cable close to the stay rod, fixing clamping pieces up and down to clamp the stay cable and screwing a bolt tightly, and connecting nodes at two sides of the stress adjusting mechanism are respectively connected with the stay rod and the connecting nodes of the stay cable fixer by pin shafts;
G. connecting an electric hydraulic oil pump; observing a pressure sensor of the stress adjusting mechanism, if the numerical value is positive, the stress adjusting mechanism is pressed, the length of the stress adjusting mechanism needs to be shortened, an oil outlet pipe of the electric hydraulic oil pump is connected with a first oil nozzle of the stress adjusting mechanism, a connecting switch is opened, an oil return pipe of the electric hydraulic oil pump is connected with a second oil nozzle of the stress adjusting mechanism, and the connecting switch is opened; observing a pressure sensor of the stress adjusting mechanism, when the numerical value is negative, the stress adjusting mechanism is pulled, the length of the stress adjusting mechanism needs to be extended, an oil outlet pipe of the electric hydraulic oil pump is connected with a second oil nozzle of the stress adjusting mechanism, a connecting switch is turned on, an oil return pipe of the electric hydraulic oil pump is connected with a first oil nozzle of the stress adjusting mechanism, and the connecting switch is turned on;
H. the oil pump applies pressure to press hydraulic oil into the hydraulic oil cylinder, the piston rod is pushed in when the initial value of the pressure sensor is positive, and the stress adjusting mechanism is shortened; when the initial value of the pressure sensor is negative, the piston rod is pushed out, the numerical value of the pressure sensor and the output pressure of the electric hydraulic oil pump are synchronously monitored, and when the numerical value of the pressure sensor is reduced to zero, oil is stopped being added into the hydraulic oil cylinder;
I. closing a switch of a connection port of a hydraulic oil cylinder nozzle and an oil outlet pipe and an oil return pipe of the electric hydraulic oil pump, and withdrawing the electric hydraulic oil pump;
J. sequentially adjusting the lengths of other stress adjusting mechanisms and adjusting the connecting position of the stay bar on the stay cable;
K. the lower clamping plate is fixed by screwing the single-side bolt;
l, dismantling the temporary support frame to finish the installation of the beam string.
8. The construction installation method of a beam string with stress adjustment according to claim 7,
and F, keeping an included angle between the stay bar and the stress adjusting mechanism at 90 degrees, ensuring that the value of a pressure sensor of the stress adjusting mechanism can accurately measure the horizontal force of the stay rope at the lower end of the stay bar, and judging whether the left horizontal force and the right horizontal force of the stay rope are offset.
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| JP3194104B2 (en) * | 1992-03-11 | 2001-07-30 | 清水建設株式会社 | Large roof structure and construction method |
| CN201778396U (en) * | 2010-06-11 | 2011-03-30 | 北京工业大学 | Cable support node connecting device |
| CN102162279B (en) * | 2011-02-14 | 2012-06-27 | 东南大学 | Tensioning joint and device for single hoop cable in cable-rod structure by top support rod |
| CN205857387U (en) * | 2016-07-29 | 2017-01-04 | 中国建筑西南设计研究院有限公司 | Multistage rung formula firm string tension structure |
| CN212248852U (en) * | 2020-03-27 | 2020-12-29 | 上海同磊土木工程技术有限公司 | Cable connection node of annular cable discontinuous string dome and tensioning device thereof |
| CN111441534B (en) * | 2020-05-09 | 2021-09-28 | 辽宁工程技术大学 | Self-adaptive beam string adjusted along with temperature and using method |
| CN112227705B (en) * | 2020-09-29 | 2022-04-01 | 浙江绿筑集成科技有限公司 | Floor slab supporting method using tensioning strings |
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