CN114045935A - Hoisting method of large-span curve truss - Google Patents
Hoisting method of large-span curve truss Download PDFInfo
- Publication number
- CN114045935A CN114045935A CN202111217147.2A CN202111217147A CN114045935A CN 114045935 A CN114045935 A CN 114045935A CN 202111217147 A CN202111217147 A CN 202111217147A CN 114045935 A CN114045935 A CN 114045935A
- Authority
- CN
- China
- Prior art keywords
- truss
- hoisting
- curved
- turning
- curved truss
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/342—Structures covering a large free area, whether open-sided or not, e.g. hangars, halls
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
- Jib Cranes (AREA)
Abstract
The invention relates to a hoisting method of a large-span curved truss, belonging to the technical field of large-span steel structure construction. The method comprises the steps of assembling the curved truss, preparing hoisting equipment, demoulding, turning over, hoisting, turning, positioning and installing the support. The method of the invention designs and uses the auxiliary turning-over device, the use of the auxiliary turning-over device enables the truss to always have a supporting point which is contacted with the ground in the turning-over process of hoisting, the stability of the truss in the hoisting process is improved, and due to the fact that the truss can be hoisted by only two cranes, the difficulty of cooperation of a plurality of cranes is reduced, the safety of the construction process is improved, the hoisting difficulty is further reduced, the hoisting efficiency is improved, and the construction period is saved.
Description
Technical Field
The invention belongs to the technical field of building construction, particularly relates to the technical field of large-span steel structure construction, and particularly relates to a hoisting method of a large-span curved truss.
Background
The large-span steel structure is one of the important marks for measuring the national building technology level, and the steel structure becomes one of the mainstream structures in the building field. The space steel pipe truss structure system is an important member in a large-span space structure, and it is particularly important to adopt a reasonable construction mode to ensure safe and efficient construction. The installation technology of the large-span steel structure mainly comprises the following steps: the method comprises the following steps of high-altitude in-situ installation technology, sliding construction technology and lifting (jacking) technology, wherein the lifting (jacking) technology needs to undergo the process of turning over to be in place to be in a lifting posture aiming at the lifting of a large-span heavy truss which is horizontally assembled.
At present, a hoisting method of double-machine lifting or double-machine lifting and single-machine auxiliary turning is mostly adopted in the process of turning the large-span space pipe truss from assembling to hoisting. The method comprises the following steps: the two cranes respectively lift one side of the truss, and the truss rotates by taking a chord member at one side as an axis along with the lifting of the lifting ropes until the turning is completed. If a curved truss with large span and self-weight is encountered, a third crane is added to assist in turning over, so that the posture of the truss in the air in the turning-over process is ensured. The hoisting method is adopted for construction, and the following defects generally exist:
1) the large-span curve type truss has the characteristics of large span, great self weight, curve trend and the like, and is easy to be interfered by various factors when a plurality of lifting cranes are used for lifting, so that safety accidents occur.
2) The synchronous hoisting of a plurality of cranes has great difficulty, and if the hoisting process is not matched properly, the truss is easy to deflect or even turn over.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a hoisting method of a large-span curved truss.
The invention is realized by the following technical scheme:
a hoisting method of a large-span curve truss comprises the following steps:
1) assembly of curved trusses
Arranging an assembly jig frame at the in-position, and assembling a curve type truss in a lying state on the assembly jig frame;
the auxiliary turning-over device is arranged in the middle of the assembled jig frame and comprises a middle connecting piece, a chord hoop is fixed at the top end of the middle connecting piece, a wheel carrier is fixed at the bottom end of the middle connecting piece, a wheel shaft is fixed on the wheel carrier, a wheel body is installed on the wheel shaft through a bearing, two ends of the wheel shaft are outwards extended to the outer side of the wheel carrier, a lateral brace is respectively fixed on the extension sections at two ends of the wheel shaft, the lateral brace at the left end of the wheel shaft is obliquely arranged towards the rear upper left, the lateral brace at the right end of the wheel shaft is obliquely arranged towards the rear upper right, and a connecting flange is arranged at the rear end of the lateral brace; the chord member hoop of the auxiliary turning-over device is fixedly clamped at the middle point of the lower chord member of the curve truss, a wheel body of the auxiliary turning-over device is supported on the ground in a rolling manner, and two lateral support rods of the auxiliary turning-over device are respectively connected and fixed with temporary steel pipes on the chord member of the curve truss through connecting flanges on the lateral support rods;
2) preparation of hoisting equipment
Hoisting the curved truss by adopting a hoisting method of double-crane hoisting, preparing two crawler cranes, standing on the same side of the curved truss and respectively arranging the two crawler cranes on two sides of the center line of the curved truss, respectively connecting and fixing steel wire ropes on the two crawler cranes with an upper chord of the curved truss and respectively arranging the connecting and fixing points on two sides of the midpoint of the upper chord;
3) demoulding
The two crawler cranes simultaneously lift the curved truss, when the lower chord of the curved truss just leaves the assembly jig frame, the auxiliary turning-over device rotates and is in a state of supporting the curved truss, and then the assembly jig frame is moved away;
4) turning over
The two crawler cranes continue to vertically lift the curved truss to drive the auxiliary turnover device supported on the ground to slide and rotate the curved truss, at the moment, the vertical load in the state is gradually reduced along with the turnover of the curved truss, the included angle between the auxiliary turnover device and the ground is gradually reduced, and the curved truss is gradually turned over under the lifting of the cranes;
5) hoisting crane
After the curved truss is turned over, the auxiliary turning device is detached, the auxiliary turning device is stably and statically placed for several minutes, the auxiliary turning device is slowly lifted when the peripheral conditions are observed to meet the lifting conditions, two sliding ropes are arranged at two ends of the truss in the lifting process, the swinging posture of the truss is controlled in an auxiliary mode, and the auxiliary turning device is finally lifted to a position where the position of a base plate of a support is 1.5m higher than the elevation of the top of a column;
6) swivel body
Turning the curved truss after the lifting is finished, wherein the turning adopts an arm climbing method, one crawler crane climbs the arm, the other crawler crane keeps static, and the arms are gradually and alternately climbed until the turning is finished;
7) in position
After the turning of the curve truss is finished, the curve truss vertically descends to a position in place, when the hoisting height of the curve truss exceeds the height of a column, a crawler crane performs posture adjustment and slowly rotates to enable the curve truss to rotate to the position above the installation position, then slowly falls into the position, a support is aligned to a control line to be initially in place during the falling, and horizontal displacement is temporarily controlled by a stop iron piece;
8) mounting of support
After the curved truss is in place, a support at one end and a column top plate are welded and fixed, an upper chord tangential inclined strut is installed, and a stabilizing measure is installed at the other end of the support in a tangential direction and comprises a support tangential baffle and the upper chord tangential inclined strut, so that the normal direction is kept in a sliding state, and wind-catching ropes are arranged on two sides of the upper chord at the four-point part of the span.
Furthermore, the curved truss is a concave inverted triangular three-dimensional steel pipe truss which is mainly formed by splicing two upper chords, a lower chord and a plurality of web members.
Further, the specific process steps of the step 2) are as follows: firstly, two crawler cranes respectively stand at corresponding positions of a plane layout of a curved truss, and the gravity center of a lifting hook is aligned with a given lifting point; binding the hoisting steel wire rope according to the designed hoisting point position, and padding a rubber pad at the binding position when the steel wire rope is bound; the steel wire rope binding method comprises the following steps: the two ends of the curved truss are respectively provided with four lifting points and two steel wire ropes, wherein two of the four lifting points at each end are positioned on one upper chord, the other two lifting points are positioned on the other upper chord, one of the two steel wire ropes at each end is bound with the two lifting points on one of the upper chords, and the other steel wire rope is bound with the two lifting points on the other upper chord.
Further, the specific process steps of the steps 3) and 4) are as follows: the two crawler cranes slowly lift the curved truss under the same instruction, because the curved truss is in a horizontal position, a steel wire rope on an upper chord close to the ground is stressed when the curved truss starts to lift, the steel wire rope on the upper chord far away from the ground is in an unstressed state, and meanwhile, an auxiliary turnover device at the middle point of a lower chord slowly slides along with the lifting of the upper chord to enable the curved truss to start to turn over until the whole curved truss is only lifted by the crawler cranes and supported by the auxiliary turnover device, the curved truss is integrally separated from an assembly jig frame, and then the assembly jig frame is removed; then, the upper chord is continuously and vertically lifted along with the two crawler cranes, the auxiliary turning-over device on the lower chord continuously slides, and the curved truss continuously turns over; the two crawler cranes continuously lift and rotate the upper chord to the extending arm until the auxiliary turning-over device on the lower chord is lifted off and the upper chord is close to the horizontal, and then the auxiliary turning-over device is removed; and after the upper chord of the curved truss is completely horizontal, the steel wire rope is completely stressed, and the turning is completed.
Furthermore, in the auxiliary turning-over device, the middle connecting piece comprises a connecting frame body and a first vertical supporting plate, the connecting frame body is formed by fixing an upper connecting plate, a lower connecting plate, a left connecting plate and a right connecting plate, the vertical section of the connecting frame body is in an inverted isosceles trapezoid shape, the first vertical supporting plate is fixed in the connecting frame body, the first vertical supporting plate is in an inverted isosceles trapezoid shape, and four plate edges of the first vertical supporting plate are respectively and vertically fixed with the four connecting plates of the connecting frame body.
Furthermore, in the auxiliary turning-over device, the chord hoops comprise a bottom plate, a second vertical supporting plate is vertically fixed on the bottom plate, a hoop body is fixed on the top plate edge of the second vertical supporting plate and is divided into a lower hoop body and an upper hoop body, the upper hoop body and the lower hoop body are detachably connected through high-strength bolts, and the cross section of the hoop body is matched with that of the lower chord of the curve type truss.
Furthermore, a plurality of reinforcing rib plates are uniformly distributed between the bottom plate and the hoop body and positioned on two sides of the second vertical supporting plate respectively, and the reinforcing rib plates are fixedly connected with the hoop body, the second vertical supporting plate and the bottom plate respectively; the outer surface of the upper half hoop body of the hoop body is uniformly and fixedly provided with a plurality of reinforcing ribs.
Furthermore, in the auxiliary turning-over device, the wheel carrier comprises a third vertical supporting plate, a top plate edge of the third vertical supporting plate is fixed with a top plate, two side plate edges of the third vertical supporting plate are respectively fixed with a side plate, the wheel shaft is fixed between the bottoms of the two side plates, and the wheel body is rotatably installed on the wheel shaft section between the two side plates through a bearing.
According to the hoisting method, the hoisting operation can be completed only by two cranes, the difficulty in cooperation of multiple cranes is reduced, the safety of the construction process is improved, the hoisting difficulty is reduced, the hoisting efficiency is improved, and the construction period is shortened. The method of the invention designs and uses the auxiliary turning-over device, the use of the auxiliary turning-over device enables the truss to always have a supporting point contacted with the ground in the turning-over process of hoisting, the stability of the truss in the hoisting process is improved, and therefore, the method of the invention can complete the whole hoisting operation only by two cranes, the construction difficulty and the workload are greatly reduced, and the device can be disassembled for repeated use after being used, thereby saving energy, protecting environment, controlling the production cost and being worthy of popularization and application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
Fig. 1 is an assembly schematic diagram before hoisting of a curved truss.
Fig. 2 is a schematic structural diagram of the turning-over assisting device.
Fig. 3 is a schematic view of the connection between the auxiliary turning-over device and the curved truss.
Fig. 4 is a schematic structural view of a chord hoop in the turning-over assisting device.
Fig. 5 is an exploded view of fig. 4.
Fig. 6 is a schematic structural diagram of a middle connecting piece in the turnover assisting device.
Fig. 7 is an exploded view of fig. 6.
Fig. 8 is a schematic structural view of a wheel carrier, a wheel shaft and a wheel body in the turning-over assisting device.
Fig. 9 is an exploded view of fig. 8.
Fig. 10 is a schematic view of the turning process of the curved truss in the method of the invention.
In the figure: a-a curve type truss, b-an assembly jig frame, c-an auxiliary turning device, d-a crawler crane and e-a steel wire rope;
1-chord hoops, 1-1-bottom plates, 1-2-second vertical support plates, 1-3-lower half hoop bodies, 1-4-upper half hoop bodies, 1-5-reinforcing rib plates, 1-6-reinforcing ribs, 2-high-strength bolts, 3-middle connecting pieces, 3-1-connecting frame bodies, 3-2-first vertical support plates, 3-3-connecting plates, 4-wheel shafts, 5-wheel bodies, 6-lateral support rods, 7-connecting flanges, 8-temporary steel pipes, 9-wheel carriers, 9-1-third vertical support plates, 9-2-top plates and 9-3-side plates.
Detailed Description
In order that those skilled in the art will better understand the present invention, a more complete and complete description of the present invention is provided below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
A hoisting method of a large-span curve truss comprises the following steps:
1) assembly of curved truss a
As shown in fig. 1, an assembly jig frame b is arranged at a position in place, a curve truss a in a lying state is assembled on the assembly jig frame b, the curve truss a is a concave inverted triangle three-dimensional steel pipe truss which is mainly formed by assembling two upper chord members, a lower chord member and a plurality of web members, and the overall appearance of the curve truss is in a catenary shape; the span of the curve truss a is 71m, the rise is 10.8m, the section height is 4m, the width is 3.5m, and the positioning height is 22.64 m;
the curved truss a is assembled by three sections of assembling units, the assembling contents comprise butt welding of an upper chord member and a lower chord member and reinforcement of a web member, the butt welding adopts an ear plate and a connecting plate for positioning, a working platform and wind and rain prevention measures are arranged at the welding part, and the welding method adopts manual or robot gas shielded welding;
an auxiliary turning-over device c is arranged at the middle position of the assembly jig frame b, as shown in fig. 1 to 3, the auxiliary turning-over device c comprises a middle connecting piece 3, a chord hoop 1 is fixed at the top end of the middle connecting piece 3, a wheel frame 9 is fixed at the bottom end of the middle connecting piece 3, a wheel shaft 4 is fixed on the wheel frame 9, a wheel body 5 is installed on the wheel shaft 4 through a bearing, two ends of the wheel shaft 4 extend outwards to the outer side of the wheel frame 9, a lateral brace 6 is respectively fixed on the extending sections at the two ends of the wheel shaft 4, the lateral brace 6 at the left end of the wheel shaft 4 is obliquely arranged towards the rear upper left, the lateral brace 6 at the right end of the wheel shaft 4 is obliquely arranged towards the rear upper right, and a connecting flange 7 is arranged at the rear end part of the lateral brace 6; the chord hoops 1 of the auxiliary turning-over device c are fixedly clamped at the middle point of the lower chord of the curved truss a, the wheel body 5 of the auxiliary turning-over device c is supported on the ground in a rolling manner, and two lateral support rods 6 of the auxiliary turning-over device c are respectively connected and fixed with temporary steel pipes 8 on the chord of the curved truss a through connecting flanges 7 on the lateral support rods;
as shown in fig. 6 and 7, in the auxiliary turning-over device c, the middle connecting piece 3 comprises a connecting frame body 3-1 and a first vertical supporting plate 3-2, the connecting frame body is formed by fixing four connecting plates 3-3, namely an upper connecting plate, a lower connecting plate, a left connecting plate and a right connecting plate, the vertical section of the connecting frame body 3-1 is in an inverted isosceles trapezoid shape, the first vertical supporting plate 3-2 is fixed in the connecting frame body 3-1, the first vertical supporting plate 3-2 is in the inverted isosceles trapezoid shape, and four plate edges of the first vertical supporting plate 3-2 are respectively and vertically fixed with the four connecting plates 3-3 of the connecting frame body 3-1;
as shown in fig. 4 and 5, in the auxiliary turning-over device c, the chord hoop 1 comprises a bottom plate 1-1, a second vertical support plate 1-2 is vertically fixed on the bottom plate 1-1, a hoop body is fixed on the top plate edge of the second vertical support plate 1-2, the hoop body is divided into a lower half hoop body 1-3 and an upper half hoop body 1-4, the upper half hoop body 1-3 and the lower half hoop body 1-4 are detachably connected through a high-strength bolt 2, and the cross section of the hoop body is matched with the cross section of the lower chord of the curved truss a; a plurality of reinforcing rib plates 1-5 are uniformly distributed between the bottom plate 1-1 and the hoop body and positioned at two sides of the second vertical supporting plate 1-2, and the reinforcing rib plates 1-5 are fixedly connected with the lower half hoop body 1-3, the second vertical supporting plate 1-2 and the bottom plate 1-1 respectively; a plurality of reinforcing ribs 1-6 are uniformly distributed and fixed on the outer surface of the upper half hoop body 1-4 of the hoop body;
as shown in fig. 8 and 9, in the auxiliary turning-over device c, the wheel carrier 9 comprises a third vertical support plate 9-1, a top plate 9-2 is fixed on the top plate edge of the third vertical support plate 9-1, side plates 9-3 are respectively fixed on the two side plate edges of the third vertical support plate 9-1, the wheel axle 4 is fixed between the bottoms of the two side plates 9-3, and the wheel body 5 is rotatably mounted on the shaft section of the wheel axle 4 between the two side plates 9-3 through a bearing;
the connecting plate 3-3 at the upper part of the middle connecting piece 3 is fixedly connected with the bottom plate 1-1 in the chord hoop 1, and the connecting plate 3-3 at the lower part of the middle connecting piece 3 is fixedly connected with the top plate 9-2 in the wheel carrier 9.
2) Preparation of hoisting equipment
Hoisting a curved truss a by adopting a hoisting method of double-crane hoisting, preparing two crawler cranes d, standing on the same side of the curved truss a and respectively arranging the crawler cranes d on two sides of the center line of the curved truss a, and respectively connecting and fixing steel wire ropes e on the two crawler cranes d with an upper chord of the curved truss a and respectively arranging the connecting and fixing points on two sides of the midpoint of the upper chord; the specific process steps are as follows: firstly, two crawler cranes d stand at corresponding positions of a plane layout diagram of a curved truss a respectively, the gravity center of a lifting hook is aligned to a given lifting point position, 260t of crawler cranes d are adopted by the crawler cranes d, the working radius of the crawler cranes d is 16m, and the hoisting of the crawler cranes d is calculated according to 85% of rated power; binding a hoisting steel wire rope e according to the designed hoisting point position, wherein the steel wire rope e adopts a steel wire rope with the diameter of 62mm, and a rubber pad is padded at the binding part when the steel wire rope e is bound; the binding method of the steel wire rope e comprises the following steps: the two ends of the curved truss a are respectively provided with four lifting points and two steel wire ropes e, wherein two of the four lifting points at each end are positioned on one upper chord, the other two lifting points are positioned on the other upper chord, and one of the two steel wire ropes e at each end is bound with two lifting points on one of the upper chords, and the other steel wire rope e is bound with two lifting points on the other upper chord; checking before hoisting, wherein the checking content comprises: whether all tool tools are cleaned when the curve-shaped truss a is assembled, whether the curve-shaped truss a is connected with the assembling jig frame b, whether the steel wire rope e is bound reasonably and reliably, whether the position of a lifting hook lifting point of the crawler crane d meets the designed technological requirements, whether other irrelevant objects are not cleaned in the lifting range, whether command information transmission of a commander, a driver of the crawler crane d and an operator is smooth, and after all conditions are met, instructions of next-step demoulding and turning over and lifting are carried out.
3) Demoulding
The two crawler cranes d simultaneously lift the curved truss a, when the lower chord of the curved truss a just leaves the assembly jig frame b, the auxiliary turning device c rotates and is in a state of supporting the curved truss a, and then the assembly jig frame b is removed; the specific process steps are as follows: the two crawler cranes d slowly lift, because the curved truss a is in a horizontal position, the steel wire rope e on the upper chord close to the ground is stressed when the lifting is started, the steel wire rope e on the upper chord far away from the ground is in an unstressed state, and meanwhile, the auxiliary turning-over device c at the middle point position of the lower chord slowly slides along with the lifting of the upper chord to enable the curved truss a to start to turn over until the whole curved truss a is only lifted by the crawler cranes d and supported by the auxiliary turning-over device c, the curved truss a is integrally separated from the assembly jig frame b, the auxiliary turning-over device c bears the weight 39t according to construction checking, and the two cranes share the lifting capacity respectively: 22.1t and 22.1t, less than 85% of the rated load capacity of the corresponding crane in this state, 54.6t and 54.6t, respectively, and then the assembly jig b is removed.
4) Turning over
The two crawler cranes d continue to vertically lift the curved truss a to drive the auxiliary turning-over device c supported on the ground to slide and rotate the curved truss a, at the moment, the vertical load in the state is turned over along with the curved truss a, the included angle between the auxiliary turning-over device c and the ground is smaller and smaller, the shared vertical load is gradually reduced, and the curved truss a is gradually turned over under the lifting of the cranes; the specific process steps are as follows: the two crawler cranes d continue to vertically lift the upper chord, the auxiliary turning-over device c on the lower chord continues to slide, the curved truss a continues to turn over, the two crawler cranes d continue to lift and rotate the upper chord until the auxiliary turning-over device c on the lower chord is lifted off and the upper chord approaches the horizontal, and then the auxiliary turning-over device c is removed; and (5) after the upper chord of the curved truss a is completely horizontal, all the steel wire ropes e are stressed, and the turning is completed.
In the turning process, when the turning machine rotates by 5 degrees, the deformation and the stress of the curve type truss a and the lifting load of the crawler crane d in the whole turning process are respectively checked, the space state of the steel wire rope e is checked, and the steel wire rope e is checked to ensure that the design requirements are met.
The whole turning process of the curved truss a is shown in figure 10.
5) Hoisting crane
After the curved truss a is turned over, the auxiliary turning device c is detached, the device is stably and statically kept for a few minutes, the device is slowly lifted when the peripheral conditions are observed to meet the lifting conditions, two sliding ropes are arranged at two ends of the truss in the lifting process, the swinging posture of the truss is controlled in an auxiliary mode, the device is finally lifted to a position where the position of a bottom plate of a support is 1.5m higher than the elevation of the top of a column, and deformation and stress of the curved truss a in the state are checked to ensure that the design requirements are met.
6) Swivel body
Turning the curved truss a after the lifting is finished, wherein the turning adopts an arm climbing method, the climbing arm of one crawler crane d and the other crawler crane d are kept static, and the climbing arms are gradually and alternately climbed until the turning is finished; and (3) carrying out simulation analysis on the whole turning process, checking and calculating the deformation and stress of the curve type truss a and the hoisting load of the crawler crane d respectively to ensure that the design requirements are met, and simultaneously carrying out attitude control through the climbing arm angle until the turning is finished to the in-position.
7) In position
After the turning of the curve truss a is completed, the curve truss a vertically descends to a position in place, when the hoisting height of the curve truss a exceeds the height of a column, a crawler crane d performs attitude adjustment and slowly rotates to enable the curve truss a to rotate to the position above the installation position, then slowly falls into the position, the support is aligned to a control line to be initially in place during the falling, and the horizontal displacement is temporarily controlled by using a stop iron piece;
8) mounting of support
After the curved truss a is in place, a support at one end and a column top plate are welded and fixed, an upper chord tangential inclined strut is installed, and a stabilizing measure including a support tangential baffle and the upper chord tangential inclined strut is installed at the other end of the support in a tangential manner, so that the normal direction is kept in a sliding state, and wind-catching ropes are arranged on two sides of the upper chord at the four-point part of the span.
The technical solutions in the embodiments of the present invention are clearly and completely described above, and the described embodiments are only a part of the embodiments of the present invention, but 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.
Claims (8)
1. A hoisting method of a large-span curve truss is characterized by comprising the following steps:
1) assembly of curved trusses
Arranging an assembly jig frame at the in-position, and assembling a curve type truss in a lying state on the assembly jig frame;
the auxiliary turning-over device is arranged in the middle of the assembled jig frame and comprises a middle connecting piece, a chord hoop is fixed at the top end of the middle connecting piece, a wheel carrier is fixed at the bottom end of the middle connecting piece, a wheel shaft is fixed on the wheel carrier, a wheel body is installed on the wheel shaft through a bearing, two ends of the wheel shaft are outwards extended to the outer side of the wheel carrier, a lateral brace is respectively fixed on the extension sections at two ends of the wheel shaft, the lateral brace at the left end of the wheel shaft is obliquely arranged towards the rear upper left, the lateral brace at the right end of the wheel shaft is obliquely arranged towards the rear upper right, and a connecting flange is arranged at the rear end of the lateral brace; the chord member hoop of the auxiliary turning-over device is fixedly clamped at the middle point of the lower chord member of the curve truss, a wheel body of the auxiliary turning-over device is supported on the ground in a rolling manner, and two lateral support rods of the auxiliary turning-over device are respectively connected and fixed with temporary steel pipes on the chord member of the curve truss through connecting flanges on the lateral support rods;
2) preparation of hoisting equipment
Hoisting the curved truss by adopting a hoisting method of double-crane hoisting, preparing two crawler cranes, standing on the same side of the curved truss and respectively arranging the two crawler cranes on two sides of the center line of the curved truss, respectively connecting and fixing steel wire ropes on the two crawler cranes with an upper chord of the curved truss and respectively arranging the connecting and fixing points on two sides of the midpoint of the upper chord;
3) demoulding
The two crawler cranes simultaneously lift the curved truss, when the lower chord of the curved truss just leaves the assembly jig frame, the auxiliary turning-over device rotates and is in a state of supporting the curved truss, and then the assembly jig frame is moved away;
4) turning over
The two crawler cranes continue to vertically lift the curved truss to drive the auxiliary turnover device supported on the ground to slide and rotate the curved truss, at the moment, the vertical load in the state is gradually reduced along with the turnover of the curved truss, the included angle between the auxiliary turnover device and the ground is gradually reduced, and the curved truss is gradually turned over under the lifting of the cranes;
5) hoisting crane
After the curved truss is turned over, the auxiliary turning device is detached, the auxiliary turning device is stably and statically placed for several minutes, the auxiliary turning device is slowly lifted when the peripheral conditions are observed to meet the lifting conditions, two sliding ropes are arranged at two ends of the truss in the lifting process, the swinging posture of the truss is controlled in an auxiliary mode, and the auxiliary turning device is finally lifted to a position where the position of a base plate of a support is 1.5m higher than the elevation of the top of a column;
6) swivel body
Turning the curved truss after the lifting is finished, wherein the turning adopts an arm climbing method, one crawler crane climbs the arm, the other crawler crane keeps static, and the arms are gradually and alternately climbed until the turning is finished;
7) in position
After the turning of the curve truss is finished, the curve truss vertically descends to a position in place, when the hoisting height of the curve truss exceeds the height of a column, a crawler crane performs posture adjustment and slowly rotates to enable the curve truss to rotate to the position above the installation position, then slowly falls into the position, a support is aligned to a control line to be initially in place during the falling, and horizontal displacement is temporarily controlled by a stop iron piece;
8) mounting of support
After the curved truss is in place, a support at one end and a column top plate are welded and fixed, an upper chord tangential inclined strut is installed, and a stabilizing measure is installed at the other end of the support in a tangential direction and comprises a support tangential baffle and the upper chord tangential inclined strut, so that the normal direction is kept in a sliding state, and wind-catching ropes are arranged on two sides of the upper chord at the four-point part of the span.
2. The hoisting method of the large-span curved truss according to claim 1, characterized in that: the curved truss is a concave inverted triangular three-dimensional steel pipe truss which is mainly formed by splicing two upper chords, a lower chord and a plurality of web members.
3. The hoisting method of the large-span curved truss according to claim 2, wherein the specific process steps of the step 2) are as follows: firstly, two crawler cranes respectively stand at corresponding positions of a plane layout of a curved truss, and the gravity center of a lifting hook is aligned with a given lifting point; binding the hoisting steel wire rope according to the designed hoisting point position, and padding a rubber pad at the binding position when the steel wire rope is bound; the steel wire rope binding method comprises the following steps: the two ends of the curved truss are respectively provided with four lifting points and two steel wire ropes, wherein two of the four lifting points at each end are positioned on one upper chord, the other two lifting points are positioned on the other upper chord, one of the two steel wire ropes at each end is bound with the two lifting points on one of the upper chords, and the other steel wire rope is bound with the two lifting points on the other upper chord.
4. The hoisting method of the large-span curved truss according to claim 3, wherein the specific process steps of the steps 3) and 4) are as follows: the two crawler cranes slowly lift the curved truss under the same instruction, because the curved truss is in a horizontal position, a steel wire rope on an upper chord close to the ground is stressed when the curved truss starts to lift, the steel wire rope on the upper chord far away from the ground is in an unstressed state, and meanwhile, an auxiliary turnover device at the middle point of a lower chord slowly slides along with the lifting of the upper chord to enable the curved truss to start to turn over until the whole curved truss is only lifted by the crawler cranes and supported by the auxiliary turnover device, the curved truss is integrally separated from an assembly jig frame, and then the assembly jig frame is removed; then, the upper chord is continuously and vertically lifted along with the two crawler cranes, the auxiliary turning-over device on the lower chord continuously slides, and the curved truss continuously turns over; the two crawler cranes continuously lift and rotate the upper chord to the extending arm until the auxiliary turning-over device on the lower chord is lifted off and the upper chord is close to the horizontal, and then the auxiliary turning-over device is removed; and after the upper chord of the curved truss is completely horizontal, the steel wire rope is completely stressed, and the turning is completed.
5. The method for hoisting the large-span curved truss according to any one of claims 1 to 4, wherein the method comprises the following steps: in the auxiliary turning-over device, the middle connecting piece comprises a connecting frame body and a first vertical supporting plate, the connecting frame body is formed by fixing an upper connecting plate, a lower connecting plate, a left connecting plate and a right connecting plate, the vertical section of the connecting frame body is in an inverted isosceles trapezoid shape, the first vertical supporting plate is fixed in the connecting frame body, the appearance of the first vertical supporting plate is in the inverted isosceles trapezoid shape, and four plate edges of the first vertical supporting plate are respectively vertically fixed with the four connecting plates of the connecting frame body.
6. The method for hoisting the large-span curved truss according to any one of claims 1 to 4, wherein the method comprises the following steps: in the supplementary device that stands up, the chord member staple bolt includes the bottom plate, and the vertical fixation has the perpendicular backup pad of second on the bottom plate, and the top flange limit that the backup pad was erected to the second is fixed with the hoop body, and the hoop body divide into the lower half hoop body and the upper half hoop body, through high strength bolt releasable connection between the upper and lower half hoop body, the cross sectional shape of hoop body and the cross sectional shape looks adaptation of the lower chord member of curve type truss.
7. The method for hoisting the large-span curved truss according to claim 6, wherein the method comprises the following steps: a plurality of reinforcing rib plates are uniformly distributed between the bottom plate and the hoop body and positioned on two sides of the second vertical supporting plate respectively, and the reinforcing rib plates are fixedly connected with the hoop body, the second vertical supporting plate and the bottom plate respectively; the outer surface of the upper half hoop body of the hoop body is uniformly and fixedly provided with a plurality of reinforcing ribs.
8. The method for hoisting the large-span curved truss according to any one of claims 1 to 4, wherein the method comprises the following steps: in the auxiliary turning-over device, the wheel carrier comprises a third vertical supporting plate, a top plate edge of the third vertical supporting plate is fixedly provided with a top plate, two side plate edges of the third vertical supporting plate are respectively fixedly provided with a side plate, the wheel shaft is fixed between the bottoms of the two side plates, and the wheel body is rotatably arranged on the wheel shaft section between the two side plates through a bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111217147.2A CN114045935B (en) | 2021-10-19 | 2021-10-19 | Hoisting method of large-span curve truss |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111217147.2A CN114045935B (en) | 2021-10-19 | 2021-10-19 | Hoisting method of large-span curve truss |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114045935A true CN114045935A (en) | 2022-02-15 |
| CN114045935B CN114045935B (en) | 2023-01-10 |
Family
ID=80205508
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111217147.2A Active CN114045935B (en) | 2021-10-19 | 2021-10-19 | Hoisting method of large-span curve truss |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114045935B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114439249A (en) * | 2022-04-07 | 2022-05-06 | 中铁建工集团有限公司 | Construction method for lifting large-span triangular truss through air swivel |
| CN115030317A (en) * | 2022-06-23 | 2022-09-09 | 中国建筑第二工程局有限公司 | Large-span truss ceiling without prestressed component |
| CN115162534A (en) * | 2022-06-23 | 2022-10-11 | 中国建筑第二工程局有限公司 | Construction method of large-span special-shaped truss ceiling |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5526628A (en) * | 1991-12-19 | 1996-06-18 | Knudson; Gary A. | Building and method and apparatus for making, panel assemblies and connecting apparatus |
| CN107090932A (en) * | 2017-05-26 | 2017-08-25 | 中国建筑第八工程局有限公司 | Large span thin-walled planar based on stiffness ring beam encircles the construction method of truss |
| CN108979152A (en) * | 2018-08-31 | 2018-12-11 | 上海宝冶集团有限公司 | Fetal membrane and its construction method for the high-altitude segmented assembly of large span steel truss |
| CN111042540A (en) * | 2019-12-18 | 2020-04-21 | 徐州中煤百甲重钢科技股份有限公司 | Construction method for aerial butt joint of ground suspension cables of super-large-span prestressed pipe truss |
| CN211840797U (en) * | 2020-03-23 | 2020-11-03 | 江西凯马百路佳客车有限公司 | Device for overturning vehicle body framework |
-
2021
- 2021-10-19 CN CN202111217147.2A patent/CN114045935B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5526628A (en) * | 1991-12-19 | 1996-06-18 | Knudson; Gary A. | Building and method and apparatus for making, panel assemblies and connecting apparatus |
| CN107090932A (en) * | 2017-05-26 | 2017-08-25 | 中国建筑第八工程局有限公司 | Large span thin-walled planar based on stiffness ring beam encircles the construction method of truss |
| CN108979152A (en) * | 2018-08-31 | 2018-12-11 | 上海宝冶集团有限公司 | Fetal membrane and its construction method for the high-altitude segmented assembly of large span steel truss |
| CN111042540A (en) * | 2019-12-18 | 2020-04-21 | 徐州中煤百甲重钢科技股份有限公司 | Construction method for aerial butt joint of ground suspension cables of super-large-span prestressed pipe truss |
| CN211840797U (en) * | 2020-03-23 | 2020-11-03 | 江西凯马百路佳客车有限公司 | Device for overturning vehicle body framework |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114439249A (en) * | 2022-04-07 | 2022-05-06 | 中铁建工集团有限公司 | Construction method for lifting large-span triangular truss through air swivel |
| CN115030317A (en) * | 2022-06-23 | 2022-09-09 | 中国建筑第二工程局有限公司 | Large-span truss ceiling without prestressed component |
| CN115162534A (en) * | 2022-06-23 | 2022-10-11 | 中国建筑第二工程局有限公司 | Construction method of large-span special-shaped truss ceiling |
| CN115162534B (en) * | 2022-06-23 | 2023-07-21 | 中国建筑第二工程局有限公司 | Construction method of large-span special-shaped truss ceiling |
| CN115030317B (en) * | 2022-06-23 | 2023-07-25 | 中国建筑第二工程局有限公司 | Large-span truss ceiling without prestress component |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114045935B (en) | 2023-01-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114045935B (en) | Hoisting method of large-span curve truss | |
| CN201580914U (en) | Monospar trackless combination gantry crane | |
| CN104805773B (en) | The Segmental assembling bridge-erecting machine of little curved bridge of constructing | |
| CN102190255B (en) | Crane | |
| WO2020048102A1 (en) | Hoisting equipment | |
| EP0480683B1 (en) | Erection workbench and construction process | |
| CN203583901U (en) | Universal assembling jig frame for any trusses | |
| CN109812021A (en) | A kind of installation method of large span welding ball grid | |
| CN201567164U (en) | Large-span self-propelled tower crane | |
| CN205917604U (en) | Case roof beam seam synovial membrane bracket that wets | |
| CN211622534U (en) | Movable cantilever operation platform | |
| CN110195411A (en) | A kind of self-propelled bridge formwork Mobile workbench | |
| CN115478649A (en) | Large-span diagonal member truss and installation method thereof | |
| CN216665066U (en) | Auxiliary turning-over device for hoisting large-span curve truss | |
| CN210457234U (en) | Assembling device for ultra-large air pipe in tall and large space | |
| CN110424811B (en) | Construction method of steel structure indirect cooling tower expansion platform | |
| CN201074167Y (en) | Indoor light movable crane | |
| CN209427655U (en) | A kind of square steel transposer | |
| CN112663583A (en) | Construction method for total assembly and closure of pile stabilizing platform | |
| CN208701520U (en) | A kind of hanging-filling beam suspension basket stretch-draw jack mobile device | |
| CN202098988U (en) | Crane | |
| CN214879613U (en) | Movable simple gantry crane device | |
| CN211945892U (en) | Roof steel truss hoisting system | |
| CN213740646U (en) | Bridge deck temporary support for mounting steel box girder | |
| CN216038318U (en) | Non-normal position one-time hoisting and overturning structure of large-span truss |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |