CN111101600A - Construction method of double-oblique-arch hyperbolic paraboloid cable net structure with limited construction space - Google Patents
Construction method of double-oblique-arch hyperbolic paraboloid cable net structure with limited construction space Download PDFInfo
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- CN111101600A CN111101600A CN201911140626.1A CN201911140626A CN111101600A CN 111101600 A CN111101600 A CN 111101600A CN 201911140626 A CN201911140626 A CN 201911140626A CN 111101600 A CN111101600 A CN 111101600A
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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
- E04B1/34—Extraordinary structures, e.g. with suspended or cantilever parts supported by masts or tower-like structures enclosing elevators or stairs; Features relating to the elastic stability
Abstract
The invention relates to the technical field of prestressed structure space construction, and discloses a construction method of a double-oblique-arch hyperbolic paraboloid cable net structure with limited construction space. One side of a construction site below the cable net structure is provided with a barrier, and the construction method comprises the steps of laying a cable net on the ground of the construction site; installing a lifting tool and a lifting steel strand; lifting the bearing cable on the side B in a single-sided mode, lifting the side A in an auxiliary mode, starting lifting the side A when the whole cable net is eccentric to a position where a limited space can be broken through in the lifting process, and mainly lifting the bearing cable on one side to simultaneously lift the bearing cable on two sides; assembling the rest cable net structure in the air in the process of lifting the bearing cable on the side A, and connecting the wind-resistant cable and the bearing cable through a cable clamp; after the bearing cable is lifted in place, fixed tensioning is carried out; integrally and synchronously lifting the wind resisting cable; and then the wind resisting cable is integrally and synchronously tensioned and fixed. The invention combines ground assembly and high-altitude assembly, lifts the bearing cable eccentrically on a single surface, and the bearing cable is firstly in place and then stretches the wind-resistant cable to form a cable net, so the construction is simple, convenient and efficient.
Description
Technical Field
The invention relates to the technical field of prestressed structure space construction, in particular to a construction method of a double-oblique-arch hyperbolic paraboloid cable net structure with limited construction space.
Background
The cable net structure is a novel structure which is developed in the middle of the 20 th century, is a space stress full-flexible prestressed structure and transmits external load by taking cables and steel members as main bearing structures. The appearance of the cable net structure has a great pushing effect on structural development, can give full play to the strength of materials, has high structural efficiency, and is particularly suitable for large-span space structures.
The cable net structure is generally in a saddle-shaped orthogonal cable net shape, the bearing cable is arranged below, the wind resisting cable is arranged above, and the upper part and the lower part are connected by a cable clamp, so that the vertical gravity load can be borne, and the wind suction force can be resisted. The edge members of the cable net structure have various forms, and can be rigid members or flexible members. The rigid members may be space curved beams, space frames or space arches, which form a self-balancing system with the cable mesh structure. If these self-balancing systems are designed to be very reasonable, then most of the horizontal forces can cancel each other out.
The flexible cable net structure has large span, more inhaul cables and larger cable force after forming. In the construction process, the rigidity of the structure is from zero to zero from assembly to forming, the geometric nonlinearity of the structure is extremely strong, and the structural shape is very difficult to control in actual construction, so that the construction difficulty is extremely high.
The existing construction method for the cable net structure is a high-altitude splicing method, a bearing cable and a wind resisting cable are respectively lifted and tensioned, connection and installation are completed in the air, a full-hall support method is generally adopted, a large number of high supports need to be erected, the occupied space is large, cross construction is not facilitated, and the construction period is seriously influenced. The other method is an integral traction lifting method, the construction idea is ground assembly, synchronous lifting and integral tensioning forming, the method has the advantages of reducing high-altitude operation and saving construction period and construction cost, and the defects are that the ground assembly requires spacious and flat space, no obstacle protruding out of the ground or rising in the whole cable net assembly range is required, the requirement on the construction site is high, and larger construction space is occupied.
For some construction projects of stages and open-air music squares, a stand area and a stage area are grown in the field, the ground elevations are different, when the roof cable net structure is constructed, the cable net is projected to the ground, and a small part of cable body is projected to a local area on the stand in the field. Under the condition that the space is limited, the cable body is bound to be in contact with the stand in the laying process, especially under the condition that the stand is high, the cable net cannot be integrally assembled and synchronously lifted on the ground, and the traditional integral traction lifting method is not applicable any more.
Disclosure of Invention
The invention provides a construction method of a cable net structure of a double-oblique-arch bearing hyperbolic paraboloid, which is suitable for a class of construction space-limited cable net structures. According to the characteristic that the structural space is limited, a construction method combining ground assembly and high-altitude assembly is adopted, the space limitation is broken through, and the construction is simple, convenient and efficient.
The technical problem to be solved is that: the general integral traction lifting method is not suitable for the condition that the ground space is limited, and the high-altitude assembly mode has large field workload, low construction efficiency and large occupied space, is not beneficial to the implementation of cross construction and seriously influences the construction period.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a construction method of a double-oblique-arch hyperbolic paraboloid cable net structure with limited construction space, wherein the cable net structure comprises a lower layer of bearing cables, an upper layer of wind resisting cables and peripheral members of the cable net, and the bearing cables and the wind resisting cables are connected and fixed through cable clamps; there is the barrier construction place one side of cable net structure below, for the limited A side in space, relative one side is the unlimited B side in space, its characterized in that: the method comprises the following steps:
step one, early design preparation: according to the construction design requirements, an integral structure model is established, the blanking lengths of the bearing cable and the wind resisting cable are respectively determined by considering the bidirectional inhaul cable under the action of prestress, and the cable clamp position is marked;
step two, arranging a supporting jig frame, and assembling an arched beam on the supporting jig frame;
thirdly, laying a cable laying channel in the construction site;
transporting the bearing cables and the wind-resistant cables to a construction site, laying a cable net on the ground of the construction site, connecting the bearing cables and the wind-resistant cables on the side B with unlimited space through cable clamps, throwing and laying the bearing cables on the side A with limited space to two sides, and temporarily not connecting the bearing cables and the wind-resistant cables;
fifthly, adjusting screw threads at the end parts of the bearing cables, and installing lifting tools and lifting steel strands at corresponding positions at the two ends of the bearing cables;
lifting the bearing cable on a single side of the side B, lifting the side A in an auxiliary manner, starting lifting the side A when the whole cable net is eccentric to break through the limited space in the lifting process, and converting the lifting of the bearing cable from one side into the lifting of the two sides simultaneously;
step seven, assembling a residual cable net structure in the air in the process of lifting the bearing cable on the side A, and connecting the wind-resistant cable and the bearing cable through a cable clamp;
step eight, after the whole bearing cable is lifted in place, cable heads at two ends of the bearing cable are respectively pinned and fixed with connecting lug plates on the arched beam, the lower layer bearing cable is in place, then the supporting jig frame with increased pressure is dismantled below two sides of the arched beam after the bearing cable is connected, and meanwhile, welding seams between the tops of the rest supporting jig frames and the arched beam are opened;
removing the lifting tools and the lifting steel strands at the two ends of the bearing cable, installing the lifting tools and the lifting steel strands at the corresponding positions at the two ends of the wind-resistant cable, and then integrally and synchronously lifting the wind-resistant cable;
tenthly, positioning the wind-resistant cable, then integrally and synchronously tensioning the wind-resistant cable, and fixing cable heads at two ends of the wind-resistant cable with the connecting lug plates on the arched beam.
The construction method of the double-oblique-arch hyperbolic paraboloid cable net structure with limited construction space further comprises the step of enabling the cable net structure to be saddle-shaped, enabling the edge component to be an arch beam, and enabling cable head screw threads at two ends of the bearing cable and the wind resisting cable to be respectively in pin joint with connecting lug plates on the arch beam.
The invention relates to a construction method of a double-oblique-arch hyperbolic paraboloid cable net structure with limited construction space, further comprising the following steps of firstly, bearing cables and then resisting cables in the cable spreading sequence in the fourth step:
step 4.1, transporting the stay cable to the site by adopting a reel, and placing the stay cable in the working range of a peripheral tower crane according to the number by using a truck crane;
step 4.2, lofting the projection positions of the bearing cable and the wind-resistant cable head of a half of the symmetry axis according to the three-dimensional space coordinate of the stay cable;
4.3, hoisting the guy cable to a guy cable releasing platform by using a crane or a tower crane according to the position number of the guy cable;
4.4, laying the bearing cable on the ground in the axial direction of the bearing cable by using a crane and a cable laying disc, and mounting a cable clamp on the bearing cable;
and 4.5, laying the wind-resistant cable on the ground in the axis direction of the wind-resistant cable by using the crane and the cable laying disc, and fixing the wind-resistant cable and the cable clamp.
The construction method of the double-inclined-arch-support hyperbolic paraboloid cable net structure with the limited construction space further comprises the step five, wherein the length of the lifting steel strand on the side where the space is not limited is the vertical distance between the connecting lug plate and the construction ground, and the length of the lifting steel strand on the side where the space is limited is the sum of the maximum distance between the connecting lug plate and the edge of the obstacle and the distance between the edge of the obstacle and the cable head of the ground cable.
The construction method of the double-oblique-arch hyperbolic paraboloid cable net structure with limited construction space further comprises the step six of lifting cable sections upwards section by section from the cable head to cross an obstacle in the process of auxiliary lifting of the bearing cable on the side A, and after the cable sections of the bearing cable on the side A completely cross the obstacle, the auxiliary lifting of the bearing cable on the side A is changed into synchronous lifting on two sides.
The construction method of the double-oblique-arch hyperbolic paraboloid cable net structure with limited construction space further comprises the steps of synchronously and slowly grading in the lifting process in the sixth step, monitoring the lifting cable force and the lifting cable position, adjusting the space position of the cable net and the distance between the cable net and an obstacle by controlling the lifting speed and the lifting height on two sides of A, B, and after the head height of the A-side cable is lifted to be at least 0.5m above the edge of the obstacle, converting the bearing cable into simultaneous lifting on two sides (the head height of the A-side cable is lifted to be at least 0.5m above the edge of the obstacle, so that the A-side cable can cross the obstacle, the lifting on the two sides is completely carried out after the obstacle is crossed and the cable clamp is installed completely), wherein the front and back related contents are the same.
The construction method of the double-oblique-arch hyperbolic paraboloid cable net structure with limited construction space further comprises the step seven of installing cable clamps while the A-side bearing cable sections cross the obstacle section by section along with the auxiliary lifting of the A-side bearing cable when the head of the A-side bearing cable upwards crosses the obstacle in the lifting process of the A-side bearing cable, completing the installation of the cable clamps synchronously when the cable sections of the A-side bearing cable completely cross the obstacle, and then changing the auxiliary lifting of the A-side bearing cable into the synchronous lifting of two sides.
The construction method of the double-oblique-arch hyperbolic paraboloid cable net structure with limited construction space further comprises the step eight of manually unloading and dismantling the support jig frame required to be dismantled in the step eight before the wind resisting cable is tensioned, wherein the support jig frame is not completely unloaded or separated in support force or pressure after the wind resisting cable is tensioned.
The construction method of the double-oblique-arch hyperbolic paraboloid cable net structure with limited construction space further comprises the following steps in the lifting and tensioning stage in the step eight:
8.1, symmetrically drawing the tooling cables of the bearing cables in batches to enable each drawing cable to gradually approach to the arched beam;
step 8.2, controlling the overall position of the cable net mainly in the traction process and controlling the traction length and traction force of the tooling cable as an auxiliary;
and 8.3, after the bearing cable is lifted in place, respectively pinning and fixing cable heads at two ends of the bearing cable with the connecting lug plates on the arched beam.
The construction method of the double-oblique-arch-bearing hyperbolic paraboloid cable net structure with limited construction space further comprises the step ten of determining the tensile force of each axis wind resisting cable according to the result of construction simulation calculation, integrally and synchronously tensioning the wind resisting cables, adjusting the lengths of cable heads at two ends, connecting the cable heads with connecting lug plates through pin shafts, automatically separating an arch beam from the top end of a middle supporting jig frame when the wind resisting cables are tensioned to a designed value, then detaching all the supporting jig frames, and finely adjusting the cable force of the roof cable according to the stress monitoring result of the cable net structure.
Compared with the prior art, the construction method of the double-oblique-arch hyperbolic paraboloid cable net structure with limited construction space has the following beneficial effects:
under the condition that the space of the site is limited, the invention adopts a construction method of combining ground assembly and high-altitude assembly, combining single-side auxiliary lifting and two-side synchronous lifting directions and respectively stretching and forming the bearing cable and the wind resisting cable (the bearing cable is firstly pulled in place and then stretched and formed) for the conventional cable net structure inhaul cable, thereby solving the problem that the cable net can not be completely assembled on the ground under the condition that the site is limited.
According to the invention, most of the cable net components are assembled on the ground, and a small number of cable net components limited by the field space are reserved for being assembled in the air in the cable net lifting process, so that the air operation amount is greatly reduced, the work load of erecting an operation platform required by assembling the inhaul cables in the air is reduced, the potential safety hazard is avoided, and the construction efficiency is improved.
The invention adopts the single-sided eccentric lifting bearing cable, the limited space side is used for assisting lifting, and after the cable net integrally crosses the limited space, the double-sided synchronous lifting is recovered, thereby solving the problem that the lifting of the cable net is blocked by a locally protruded barrier and avoiding the surface abrasion of the cable net component. The invention adopts the cable net forming method that the bearing cable is directly lifted and installed in place and then the wind resisting cable is tensioned, thereby reducing the tensioning quantity of the inhaul cable and being convenient for controlling the tensioning forming effect of the cable net.
The construction method of the double-oblique-arch hyperbolic paraboloid cable net structure with limited construction space is further explained with reference to the attached drawings.
Drawings
FIG. 1 is a schematic structural diagram of a construction method of a double-oblique-arch hyperbolic paraboloid cable net structure with limited construction space;
FIG. 2 is a top view of a cable net structure;
FIG. 3 is a schematic structural view of a cable clamp connection node;
FIG. 4 is a schematic view of the arrangement of the support jig;
FIG. 5 is the mounting structure shown in step five;
FIG. 6 is a schematic view of the construction process of side B single-sided lifting of the bearing cable and side A auxiliary lifting in step six;
FIG. 7 is a schematic view of the construction process of bilateral synchronous lifting after bursting the restricted space in step six;
fig. 8 is a schematic diagram of the construction process of positioning the bearing cable in the eighth step.
Reference numerals:
1-a load bearing cable; 2-wind-resistant cable; 3-arched girders; 4-a cable clamp; 5-an obstacle; 6-supporting the jig frame; 7-lifting the steel strand.
Detailed Description
As shown in fig. 1 to 3, the cable net structure of the double-oblique-arch hyperbolic paraboloid of the invention with limited construction space is saddle-shaped and comprises a bearing cable 1 at the lower layer, a wind-resistant cable 2 at the upper layer and edge members at the periphery of the cable net, wherein the bearing cable 1 and the wind-resistant cable 2 are fixedly connected through a cable clamp 4; the edge component is an arched beam 3, the arched beam 3 is a floor type double-inclined arched beam 3, cable head screw threads at two ends of the bearing cable 1 and the wind resisting cable 2 are respectively in pin joint with connecting lug plates on the arched beam 3, one side of a construction site below the cable net structure is provided with a barrier 5, the side is a space limited A side, and the opposite side is a space unlimited B side.
In this embodiment, a stage roof on an open music square is taken as an example for explanation, the maximum span of two arched beams 3 in the north-south direction is 180m, the maximum span in the east-west direction is 90m, and the heights of the top points of steel arched beams 3 on the east and west sides are 45m, wherein stay cables arranged in the east-west direction are bearing cables 1, vanadium cables with the diameter of 48mm are adopted, and the number of the bearing cables 1 is 33; the south-north direction guy cable is a wind resistant cable 2, a high vanadium cable with the diameter of 48mm is adopted, and the number of the wind resistant cables 2 is 21. The maximum span of the bearing cable 1 is about 90m, and the maximum span of the wind resisting cable 2 is 134 m.
The invention relates to a construction method of a cable net structure of a double-oblique-arch hyperbolic paraboloid with limited construction space, which specifically comprises the following steps:
step one, early design preparation: according to the construction design requirements, an integral structure model is established, and the blanking lengths of the bearing cable 1 and the wind resisting cable 2 are respectively determined by considering the bidirectional guy cable under the action of prestress.
Carrying out simulation calculation analysis in the whole construction process according to a designed pre-stress value, and finally determining the blanking marking force of the stay cable, wherein when the stay cable is blanked in a factory, the bearing cable 1 and the wind-resistant cable 2 are blanked under the stress action, and the position of a cable clamp 4 is marked on a cable body; and strict control is performed in the construction process, the cable clamp 4 is ensured to be installed according to the marked position in the installation process of the cable clamp 4, and meanwhile, local adjustment is performed according to the actual situation.
The tension of each inhaul cable is determined through simulation analysis and calculation of the construction process, and the construction simulation calculation and analysis are carried out through the control of the lifting process, so that the structure safety and reliability of each stage of the construction process are ensured. The simulation calculation analysis of each construction step can be carried out on the structure through finite element analysis software, so that the rationality and the feasibility of the construction process are verified, a theoretical basis is provided for the whole cable lifting process, and the following calculation results are obtained:
①, verifying the feasibility of the lifting construction scheme and ensuring the safety of the structure traction lifting forming process;
②, the magnitude of the cable force of the stay cable in each lifting step is given, and theoretical basis is provided for the design of a tensioning tool and the configuration of a jack during actual lifting;
③, the deformation of each tension step structure and the stress of the arched girder 3 structure are given, and a theoretical basis is provided for the deformation monitoring and the stress monitoring in the tension process.
Step two, arranging a supporting jig frame 6, assembling the arched beam 3 on the supporting jig frame 6, and arranging the supporting jig frame 6 as shown in fig. 4;
thirdly, laying a cable laying channel in the construction site;
lay respectively at stage district and stand district and put the cable passageway, because the stand is continuous echelonment, highly be the gradient change, the partial cable of stage roof projection in stand top need be spread on the stand, consequently before the construction, in order to prevent that the cable from promoting the in-process and leading to the fact destruction to the stand, pass through concrete height stand juncture and the inboard edge of stadium stand at the cable and adopt the plank to set up the passageway, in order to alleviate the friction to the cable body in the promotion process, prevent that the cable from wearing and tearing or the surface is stained with earth, also avoid the damage of cable body to the stand.
And fourthly, conveying the bearing cable 1 and the wind resisting cable 2 to a construction site, laying a cable net on the ground of the construction site, connecting the bearing cable 1 and the wind resisting cable 2 on the side B with unlimited space through a cable clamp 4, throwing the bearing cable 1 on the side A with limited space to two sides, and temporarily not making connection.
According to the characteristics of the cable net of the roof, the whole roof is projected on the ground to form a jujube-stone shape, the bearing cable 1 is arranged in the short axis direction, the wind resisting cable 2 is arranged in the long axis direction, and the bearing cable 1 is arranged below the wind resisting cable 2. Therefore, the cable spreading sequence is that the bearing cable 1 is firstly carried out and then the wind resisting cable 2 is carried out, and the specific operation steps are as follows:
step 4.1, transporting the stay cable to the site by adopting a reel, and placing the stay cable in the working range of a peripheral tower crane according to the number by using a truck crane;
step 4.2, lofting the projection positions of the bearing cable 1 and the wind resisting cable 2, which are half of the symmetry axis, according to the three-dimensional space coordinate of the stay cable;
4.3, hoisting the guy cable to a guy cable releasing platform by using a crane or a tower crane according to the position number of the guy cable;
4.4, laying the bearing cable 1 on the ground in the axial direction of the bearing cable 1 by using a crane and a cable laying disc, mounting a cable clamp 4 on the bearing cable 1, and laying the bearing cable 1 to form flow construction, so that the construction efficiency is improved, and the construction period is shortened;
and 4.5, laying the wind-resistant cable 2 on the ground in the axis direction of the wind-resistant cable 2 by using a crane and a cable releasing disc, fixing the wind-resistant cable 2 and the cable clamp 4, reasonably arranging construction teams, constructing orderly, and trying to basically finish the installation of the cable clamp 4 after the cable net is laid.
In the process of releasing the cable, the cable can be accelerated when the cable is opened, so that the cable can be bounced off the scattered disc, the safety of workers is easily endangered, and therefore, in the process of releasing the cable, the local cable disc is bound by a hoisting belt, the cable is released while being bound, the cable disc is slowly pulled at a constant speed, and the cable disc is prevented from bouncing off and hurting people. After the inhaul cable is unfolded, the inhaul cable is straightened by adopting the guide chain according to the straight marked line on the surface of the inhaul cable body, so that the inhaul cable body is prevented from twisting and jumping. The flexibility of the flexible cable is relatively good, and the cable body is prevented from being damaged and scratched in the processes of assembling, lifting, drawing and tensioning.
And step five, adjusting screw threads at the end parts of the bearing cables 1, and installing lifting tools and lifting steel strands 7 at corresponding positions at the two ends of the bearing cables 1, as shown in fig. 5.
And (3) actually measuring the installation error after the arched beam 3 is installed, actually measuring the cable length error after the inhaul cable is manufactured, and then adjusting the exposed length of the screw rod at the tensioning end of the inhaul cable according to the error value of the two errors.
One end of the lifting steel strand 7 is connected with a connecting lug plate on the arched beam 3 through a rotatable inserting lug, the other end of the lifting steel strand penetrates through a lifting tool, and the lifting tool can use application number 2014100659413 and is named as a self-climbing construction device in the invention patent of a method for self-climbing construction of the self-climbing construction device.
The length of the lifting steel strand 7 needs to be determined through lofting, the length of the lifting steel strand 7 on the side where the space is not limited is the vertical distance between the connecting lug plate and the construction ground, and the length of the lifting steel strand 7 on the side where the space is limited is the sum of the maximum distance between the connecting lug plate and the edge of the obstacle 5 and the distance between the edge of the obstacle 5 and the ground cable head.
Sixthly, lifting the bearing rope 1 on the side B in a single-sided manner, assisting lifting on the side A, and starting lifting on the side A when the whole rope net is eccentric to break through the limited space in the lifting process as shown in figure 7, wherein the lifting is also started on the side A, and the bearing rope 1 is mainly lifted from one side to be lifted into two sides to be lifted simultaneously.
In the lifting process of the bearing rope 1 on the side A, the rope segments are lifted upwards section by section from the rope head to cross the obstacle 5, and after the rope segments of the bearing rope 1 on the side A completely cross the obstacle 5, the auxiliary lifting of the bearing rope 1 on the side A is changed into synchronous lifting on two sides.
The lifting process is carried out synchronously and slowly in a grading manner, the lifting cable force and the lifting cable position are monitored, and the spatial position of the cable net and the distance between the cable net and the barrier 5 are adjusted by controlling the lifting speed and the lifting height of A, B on two sides in the lifting process; monitoring the cable net shape by using a total station, wherein the monitoring point is given in advance in a construction monitoring scheme; issuing an adjusting instruction according to a real-time monitoring result of the total station and the prejudgment of a technician on the position relation between the cable net and the obstacle 5, and adjusting A, B the lifting speed and the lifting height of the lifting devices on the two sides; through three-dimensional lofting, when the height of the A side cable head is at least lifted to be 0.5m above the edge of the barrier 5, the A side cable net can be guaranteed to smoothly break through the limited space, and the A side cable net is prevented from colliding with the edge of the barrier 5.
Seventhly, assembling a residual cable net structure in the air in the process of lifting the bearing cable 1 on the side A, and connecting the wind resisting cable 2 with the bearing cable 1 through a cable clamp 4;
in the lifting process of the A-side bearing rope 1, when the head of the A-side rope upwards crosses the obstacle 5, along with the auxiliary lifting of the A-side bearing rope 1, the rope clip 4 is installed while the rope section of the A-side bearing rope 1 passes through the obstacle 5 section by section, when the rope section of the A-side bearing rope 1 completely passes through the obstacle 5, the installation of the rope clip 4 is synchronously completed, and then the auxiliary lifting of the A-side bearing rope 1 is changed into the synchronous lifting of two sides; and the cable clamp 4 is installed, and the rest cable clamp 4 on the bearing cable 1 is fixedly connected with the wind resisting cable 2 in the air by using a high-altitude arm lifting vehicle.
And step eight, after the whole bearing cable 1 is lifted to the proper position, cable heads at two ends of the bearing cable 1 are respectively connected and fixed with connecting lug plates on the arched beam 3 through pins, as shown in figure 8, the bearing cable 1 at the lower layer is positioned, then the supporting tire frames 6 with increased pressure after the bearing cables 1 are connected below two sides of the arched beam 3 are dismantled, and meanwhile, welding seams between the tops of the rest supporting tire frames 6 and the arched beam 3 are opened.
The floor type double-oblique-arch hyperbolic paraboloid cable net structure is supported by a supporting jig frame 6 before cable net stretch forming, and after the cable net stretch forming is completed, the load of the whole cable net structure is born by a gravity type anti-pushing foundation of arch feet at two sides.
According to the process, the bearing cable 1 is lifted and installed firstly, then the wind resisting cable 2 is stretched to stretch and form a cable net structure, and the construction simulation shows that in the process of stretching the wind resisting cable 2, the supporting jig frame 6 which is higher near the center of the arch is gradually unloaded and separated, and the supporting force of the supporting jig frame 6 which is lower near the arch feet at two sides is increased. Therefore, after the load-bearing cable 1 is installed in place and before the wind-resistant cable 2 is stretched, the supporting jig frame 6 with increased pressure needs to be removed, and the specific removal positions and the number are determined by construction simulation analysis.
The position of the support bed-jig 6 is determined according to the standard that after the wind-resistant cable 2 is stretched, the supporting force or pressure of the support bed-jig 6 is not completely unloaded and separated, and the manual unloading and the removal are required before the wind-resistant cable 2 is stretched.
In this lifting tension stage, the specific operation process is as follows:
8.1, symmetrically drawing the tooling cables of the bearing cables 1 in batches to enable each drawing cable to gradually approach to the arched beam 3;
8.2, controlling the overall position of the cable net in the traction process, and controlling the traction length and traction force of the tooling cable as an auxiliary;
the control standard of the overall configuration of the cable net in the traction process is as follows: the overall configuration conforms to theoretical analysis, the geometry is stable, and the stay cable does not twist; the control standard of the traction length of the tool cable in the traction process is as follows: deviation from the theoretical value is less than +/-50 mm; the control standard of the traction force in the traction process is as follows: deviation from the theoretical calculation cable force value is less than +/-30 percent; the bearing capacity of the traction tool cable subjected to main stress has twice safety factor;
8.3, after the bearing cable 1 is lifted to the proper position, cable heads at two ends of the bearing cable 1 are respectively fixed with connecting lug plates on the arched girder 3 in a pin joint mode.
And ninthly, removing the lifting tools and the lifting steel strands 7 at the two ends of the bearing cable 1, installing the lifting tools and the lifting steel strands at the corresponding positions at the two ends of the wind resisting cable 2, and then integrally and synchronously lifting the wind resisting cable 2.
The wind-resistant cable 2 is connected with the bearing cable 1 through the cable clamp 4 on the ground, when the bearing cable 1 is lifted in place, the cable head of the wind-resistant cable 2 is lifted in the air, the cable clamp 4 is connected, the wind-resistant cable 2 is close to the connecting lug plate, a lifting tool and the lifted wind-resistant cable 2 are assembled by adopting a guide chain and a node part operating platform, the lifting can be carried out after the assembly is finished, the lifting process needs to be synchronously and slowly carried out in a grading manner, the lifting cable force and the position and shape are monitored at the same time, and the wind-resistant cable is lifted to the connecting lug plate of the arch beam 3 at one time, and the stretching and fixing can be carried out.
Tenthly, positioning the wind resisting cable 2, then integrally and synchronously tensioning the wind resisting cable 2, and fixing cable heads at two ends of the wind resisting cable 2 with connecting lug plates on the arched girder 3.
According to the result of construction simulation calculation, determining the tension force of each axis wind-resistant cable 2, integrally and synchronously tensioning the wind-resistant cables 2, adjusting the lengths of cable heads at two ends, connecting the cable heads with a connecting lug plate by using a pin shaft, automatically separating the top ends of an arch beam 3 and a middle supporting jig frame 6 when the wind-resistant cables 2 are tensioned to a designed value, then removing all the supporting jig frames 6, and finely adjusting the cable force of the roof cable according to the stress monitoring result of a cable net structure.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (10)
1. The construction method of the double-oblique-arch hyperbolic paraboloid cable net structure with limited construction space comprises the following steps that the cable net structure comprises a lower layer of bearing cables (1), an upper layer of wind-resistant cables (2) and peripheral members of the cable net, wherein the bearing cables (1) and the wind-resistant cables (2) are fixedly connected through cable clamps (4); there is barrier (5) construction place one side of cable net structure below, for the limited A side in space, relative one side is the unlimited B side in space, its characterized in that: the method comprises the following steps:
step one, early design preparation: according to the construction design requirements, an integral structure model is established, the blanking lengths of the bearing cable (1) and the wind-resistant cable (2) are respectively determined by considering the bidirectional guy cable under the action of prestress, and the position of a cable clamp (4) is marked;
step two, arranging a supporting jig frame (6), and assembling the arched beam (3) on the supporting jig frame (6);
thirdly, laying a cable laying channel in the construction site;
transporting the bearing cables (1) and the wind-resistant cables (2) to a construction site, laying a cable net on the ground of the construction site, connecting the bearing cables (1) and the wind-resistant cables (2) on the side B with unlimited space through cable clamps (4), throwing the bearing cables (1) on the side A with limited space to two sides, and laying without connection temporarily;
fifthly, adjusting screw threads at the end part of the bearing cable (1), and installing lifting tools and lifting steel strands (7) at corresponding positions at the two ends of the bearing cable (1);
lifting the bearing rope (1) on a single side of the side B, wherein the side A is lifted in an auxiliary mode, when the whole rope net is eccentric to break through a limited space in the lifting process, the side A is lifted, and the bearing rope (1) is mainly lifted from one side to be lifted into two sides to be lifted simultaneously;
seventhly, assembling a residual cable net structure in the air in the process of lifting the bearing cable (1) on the side A, and connecting the wind-resistant cable (2) with the bearing cable (1) through a cable clamp (4);
step eight, after the whole bearing cable (1) is lifted to the right position, cable heads at two ends of the bearing cable (1) are respectively fixed with connecting lug plates on the arched beam (3) in a pin joint mode, the lower layer bearing cable (1) is in position, then a supporting jig frame (6) with increased pressure is removed after the lower portions of two sides of the arched beam (3) are connected with the bearing cable (1), and meanwhile welding seams between the tops of the rest supporting jig frames (6) and the arched beam (3) are opened;
ninthly, removing the lifting tools and the lifting steel strands (7) at the two ends of the bearing cable (1), installing the lifting tools and the lifting steel strands at corresponding positions at the two ends of the wind-resistant cable (2), and then integrally and synchronously lifting the wind-resistant cable (2);
tenthly, positioning the wind resisting cable (2), then integrally and synchronously tensioning the wind resisting cable (2), and fixing cable heads at two ends of the wind resisting cable (2) with connecting lug plates on the arched beam (3).
2. The construction method of the double-oblique-arch hyperbolic paraboloid cable net structure with limited construction space according to claim 1, wherein: the cable net structure is saddle-shaped, the edge component is an arched beam (3), and cable head screw threads at two ends of the bearing cable (1) and the wind resistant cable (2) are respectively in pin joint with connecting lug plates on the arched beam (3).
3. The construction method of the double-oblique-arch hyperbolic paraboloid cable net structure with limited construction space according to claim 1, wherein: the cable spreading sequence in the fourth step is that the bearing cable (1) is firstly carried out and then the wind resisting cable (2) is carried out, and the concrete operation steps are as follows:
step 4.1, transporting the stay cable to the site by adopting a reel, and placing the stay cable in the working range of a peripheral tower crane according to the number by using a truck crane;
step 4.2, lofting the projection positions of the bearing cable (1) and the wind-resistant cable (2) which are half of the symmetry axis according to the three-dimensional space coordinate of the stay cable;
4.3, hoisting the guy cable to a guy cable releasing platform by using a crane or a tower crane according to the position number of the guy cable;
4.4, laying the bearing cable (1) on the ground in the axial direction of the bearing cable (1) by using a crane and a cable laying disc, and installing a cable clamp (4) on the bearing cable (1);
and 4.5, laying the wind-resistant cable (2) on the ground in the axis direction of the wind-resistant cable (2) by using a crane and a cable laying disc, and fixing the wind-resistant cable and the cable clamp (4).
4. The construction method of the double-oblique-arch hyperbolic paraboloid cable net structure with limited construction space according to claim 1, wherein: and fifthly, the length of the lifting steel strand (7) on the side where the space is not limited is the vertical distance between the connecting lug plate and the construction ground, and the length of the lifting steel strand (7) on the side where the space is limited is the sum of the maximum distance between the connecting lug plate and the edge of the obstacle (5) and the distance between the edge of the obstacle (5) and the ground cable head.
5. The construction method of the double-oblique-arch hyperbolic paraboloid cable net structure with limited construction space according to claim 1, wherein: and step six, in the process of auxiliary lifting of the A-side bearing rope (1), the rope sections are lifted upwards section by section from the rope head to cross the obstacle (5), and after the rope sections of the A-side bearing rope (1) completely cross the obstacle (5), the auxiliary lifting of the A-side bearing rope (1) is changed into synchronous lifting of two sides.
6. The construction method of the double-oblique-arch hyperbolic paraboloid cable net structure with limited construction space according to claim 5, wherein the construction method comprises the following steps: and step six, synchronously and slowly carrying out grading in the lifting process, monitoring the lifting rope force and the position, adjusting the space position of the rope net and the distance between the rope net and the barrier (5) by controlling the lifting speed and the lifting height of A, B two sides, and after the height of the rope head at the A side is lifted to be at least 0.5m above the edge of the barrier (5), the bearing rope (1) is lifted simultaneously by two sides.
7. The construction method of the double-oblique-arch hyperbolic paraboloid cable net structure with limited construction space according to claim 1, wherein: seventhly, in the lifting process of the A-side bearing rope (1), when the head of the A-side rope passes over the obstacle (5) upwards, the rope clamp (4) is installed while the rope section of the A-side bearing rope (1) passes over the obstacle (5) section by section along with the auxiliary lifting of the A-side bearing rope (1), when the rope section of the A-side bearing rope (1) completely passes over the obstacle (5), the installation of the rope clamp (4) is completed synchronously, and then the auxiliary lifting of the A-side bearing rope (1) is changed into synchronous lifting of two sides.
8. The construction method of the double-oblique-arch hyperbolic paraboloid cable net structure with limited construction space according to claim 1, wherein: and step eight, the supporting jig frame (6) needing to be dismantled is the supporting jig frame (6) of which the supporting force or pressure is not completely unloaded and separated after the wind resisting cable (2) is tensioned, and the supporting jig frame (6) is manually unloaded and dismantled before the wind resisting cable (2) is tensioned.
9. The construction method of the double-oblique-arch hyperbolic paraboloid cable net structure with limited construction space according to claim 1, wherein: in the eighth step, in the lifting and tensioning stage, the method specifically comprises the following steps:
8.1, symmetrically drawing the tooling cables of the bearing cables (1) in batches to enable each drawing cable to gradually approach the arched beam (3);
step 8.2, controlling the overall position of the cable net mainly in the traction process and controlling the traction length and traction force of the tooling cable as an auxiliary;
and 8.3, after the bearing cable (1) is lifted to the position, cable heads at two ends of the bearing cable (1) are respectively fixed with connecting lug plates on the arched beam (3) in a pin joint mode.
10. The construction method of the double-oblique-arch hyperbolic paraboloid cable net structure with limited construction space according to claim 1, wherein: in the tenth step, the tension force of each axis wind resisting cable (2) is determined according to the result of construction simulation calculation, the wind resisting cables (2) are integrally and synchronously tensioned, the lengths of cable heads at two ends are adjusted, the cable heads are connected with the connecting lug plates through pin shafts, when the wind resisting cables (2) are tensioned to a designed value, the arch beam (3) is automatically separated from the top end of the middle supporting jig frame (6), then all the supporting jig frames (6) are dismantled, and the cable force of the roof cable is finely adjusted according to the stress monitoring result of the cable net structure.
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| CN112324150A (en) * | 2020-10-15 | 2021-02-05 | 广东省建筑设计研究院有限公司 | Single-layer saddle-shaped cable net tensioning construction method |
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