CN110512521B - Butt joint device and butt joint method for large-section steel truss girder - Google Patents
Butt joint device and butt joint method for large-section steel truss girder Download PDFInfo
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- CN110512521B CN110512521B CN201910696451.6A CN201910696451A CN110512521B CN 110512521 B CN110512521 B CN 110512521B CN 201910696451 A CN201910696451 A CN 201910696451A CN 110512521 B CN110512521 B CN 110512521B
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- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Abstract
The invention discloses a butt joint device of a large-section steel truss girder, which is used for butt joint of a girder erection section and a girder to be erected; the large-section steel truss girder comprises an upper chord, a lower chord, a vertical rod, a butt joint rod and a large cross beam; the docking device includes: one end of the first counter-pulling mechanism is connected with a large cross beam in the beam section to be erected, and the other end of the first counter-pulling mechanism is connected with a corresponding large cross beam in the erected beam section; when the first counter-pulling mechanism is in counter-pulling, a large cross beam of the beam section to be erected approaches to a corresponding large cross beam in the erected beam section; two ends of the second counter-pulling mechanism are respectively arranged in the middle of the erected beam section and the beam section to be erected; when the second counter-pulling mechanism is in counter-pulling, a counter-connecting rod in the beam section to be erected approaches to a corresponding counter-connecting rod in the erected beam section; a jack-up mechanism comprising a jack-up; the jacking device is arranged on the upper chord in the beam section to be erected, and the top of the jacking device is fixed; when the jack is jacked upwards, the beam section to be erected is pressed downwards. The invention effectively adjusts the relative deformation between the erected beam section and the beam section to be erected, and realizes the butt joint of the large-section steel truss beam.
Description
Technical Field
The invention relates to the technical field of steel truss girder butt joint, in particular to a butt joint device and a butt joint method for a large-section steel truss girder.
Background
With the rapid development of economic and technological innovations, bridge spans in traffic construction are also becoming longer. The large-span bridge is mostly cable-stay bridge, and to cable-stay bridge, especially the dual-purpose heavy load cable-stay bridge of public railway compares in real web member, adopts the steel longeron can alleviate the dead weight and increase rigidity in order to be adapted to the load-carrying members of great span better.
In the prior art, a conventional butt joint method is that a temporary table is erected below a butt joint area, a lower chord support of a steel truss girder to be erected is arranged on the temporary table, the upper chord height of the steel truss girder to be erected and the position of the steel truss girder to be erected are adjusted through crane suspension, a crane is continuously suspended, and the crane is moved after butt joint welding is completed. However, when a large-section steel truss girder is integrally erected in a large-span cable-stayed bridge, the large-section steel truss girder forms a stable structure with large self-weight, so that the front support point reaction force at the crane station is large, and the position of the butt joint of the erected large-section steel truss girder and the steel truss girder to be erected is large in vertical and axial relative deformation, and under the condition, if the conventional butt joint method is adopted, the large-section steel truss girder cannot be directly butted by adopting a nail punching mode.
Therefore, one of the purposes of the invention is to solve the difficult problem of butt joint of the large-section steel truss girder.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a butt joint device and a butt joint method for a large-section steel truss girder, which can effectively adjust the relative deformation between a girder erection section and a girder section to be erected and realize butt joint of the large-section steel truss girder.
In order to achieve the above object, in a first aspect, an embodiment of the present invention provides a butt joint device for large-section steel trusses, which is used for butt joint of two large-section steel trusses, and defining the two large-section steel trusses as a beam section to be erected and a beam section to be erected; the large-section steel truss girder comprises:
the bridge structure comprises a plurality of groups of chord beam units arranged in parallel at intervals, wherein each group of chord beam units comprises an upper chord, a lower chord, at least one vertical rod connected with the upper chord and the lower chord, and two butt-joint rods arranged outside all the vertical rods;
at least two large beams are arranged between every two adjacent upper chords and are respectively arranged at two ends of the two upper chords, and the large beams in the beam section to be erected are arranged opposite to the large beams in the beam section already erected;
the docking device includes:
one end of the first counter-pulling mechanism is connected with a large cross beam in the beam section to be erected, and the other end of the first counter-pulling mechanism is connected with a corresponding large cross beam in the erected beam section; when the first counter-pulling mechanism is in counter-pulling, a large cross beam of the beam section to be erected approaches to a corresponding large cross beam in the erected beam section;
two ends of the second counter-pulling mechanism are respectively arranged in the middle of the erected beam section and the beam section to be erected; when the second counter-pulling mechanism is in counter-pulling, a counter-connecting rod in the beam section to be erected approaches to a corresponding counter-connecting rod in the erected beam section;
a jack-up mechanism comprising a jack-up; the jacking device is arranged on an upper chord in the beam section to be erected, and the top of the jacking device is fixedly arranged; when the jack is jacked upwards, the beam section to be erected is pressed downwards.
On the basis of the technical scheme, the jacking mechanism further comprises:
one end of the shoulder pole beam is connected with the upper chord in the erected beam section, the other end of the shoulder pole beam is connected with the upper chord in the beam section to be erected, and the shoulder pole beam is fixedly arranged at the top of the jack; when the jack jacks up the shoulder pole beam, the upper chord in the beam section to be erected moves downwards.
On the basis of the technical scheme, the jacking mechanism further comprises:
and the two third lug seats are fixedly arranged on the upper chord of the erected beam section and the upper chord of the beam section to be erected respectively, and two ends of the shoulder pole beam are detachably connected with the two third lug seats through pin shafts respectively.
On the basis of the above technical solution, the first counter-pulling mechanism includes:
two ends of the steel rope are respectively connected with the two large cross beams which are opposite;
and the jack is arranged at least one end of the steel rope and is used for contracting the length of the steel rope.
On the basis of the above technical solution, the first counter-pulling mechanism further includes:
and the two first lug seats are fixedly arranged on the erected beam section and the beam section to be erected respectively, and each first lug seat is detachably connected with one steel rope.
On the basis of the technical scheme, one end of the second counter-pulling mechanism is connected with the butt-joint rod in the erected beam section, and the other end of the second counter-pulling mechanism is connected with the vertical rod which is close to the butt-joint rod in the beam section to be erected.
In a second aspect, an embodiment of the present invention further provides a butt joint device for large-section steel trusses, which is used for butt joint of two large-section steel trusses, and defining the two large-section steel trusses as a beam section to be erected and a beam section to be erected; the large-section steel truss girder comprises:
the bridge structure comprises a plurality of groups of chord beam units arranged in parallel at intervals, wherein each group of chord beam units comprises an upper chord, a lower chord, at least one vertical rod connected with the upper chord and the lower chord, and two butt-joint rods arranged outside all the vertical rods;
the large cross beams in the beam section to be erected and the large cross beams in the erected beam section are arranged oppositely;
the docking device includes:
one end of the first counter-pulling mechanism is used for being connected with a large cross beam in the erected beam section, and the other end of the first counter-pulling mechanism is used for being connected with a corresponding large cross beam in the beam section to be erected;
two ends of the second counter-pulling mechanism are respectively used for being arranged in the middle of the erected beam section and the beam section to be erected;
a jack-up mechanism comprising a jack-up; the bottom of the jack is used for being arranged on an upper chord in the beam section to be erected, and the top of the jack is used for being fixedly arranged; the jacking device is used for pressing the beam section to be erected downwards when jacking upwards.
In a third aspect, an embodiment of the present invention further provides a butt joint method for a large-section steel truss girder, where the butt joint method is implemented by the above butt joint apparatus, and the butt joint method includes:
step 1: aligning and butting all lower chords in the beam section to be erected with all lower chords in the erected beam section;
step 2: using a first counter-pulling mechanism to counter-pull the large cross beam in the beam section to be erected and the large cross beam in the erected beam section, and roughly aligning the butt joint rod in the beam section to be erected and the butt joint rod in the erected beam section;
and step 3: using a second opposite-pulling mechanism to oppositely pull the middle parts of the beam section to be erected and the erected beam section, accurately aligning and abutting the abutting rod in the beam section to be erected and the abutting rod in the erected beam section;
and 4, step 4: and (3) jacking upwards by using a jacking device in the jacking mechanism, pressing down the upper chord in the girder section to be erected, aligning and butting the upper chord, and thus completing the butting of the large-section steel truss girder.
On the basis of the technical scheme, the specific steps of the step 4 comprise:
step 401: secondly, the first counter-pulling mechanism is used for counter-pulling the large cross beam in the beam section to be erected and the large cross beam in the erected beam section, and the upper chord in the beam section to be erected and the upper chord in the erected beam section are roughly aligned;
step 402: and (3) jacking upwards by using a jacking device in the jacking mechanism, pressing down the upper chord in the beam section to be erected, and accurately aligning and butting the upper chord in the beam section to be erected and the upper chord in the erected beam section.
On the basis of the technical scheme, the first counter-pulling mechanism comprises a first ear seat, the second counter-pulling mechanism comprises a second ear seat, and the jacking mechanism comprises a third ear seat; the step 1 further comprises:
and before the lower chord is butted, the first lug seat, the second lug seat and the third lug seat are all pre-arranged on the erected beam section and the beam section to be erected.
Compared with the prior art, the invention has the advantages that:
(1) the embodiment of the invention provides a butt joint device of a large-section steel truss girder, which is characterized in that adjusting devices are reasonably distributed at the butt joint position of the large-section steel truss girder, so that the relative deformation between the butt joint of a girder erection section and a girder section to be erected is effectively adjusted, the rapid butt joint construction of the large-section steel truss girder is realized, and the butt joint quality is improved.
(2) The adjusting device adopted by the embodiment of the invention has a simple structure, can be repeatedly used, improves the utilization rate and reduces the engineering cost.
(3) The embodiment of the invention provides a butt joint method of a large-section steel truss girder, which is characterized in that according to a specific sequence, the relative deformation between butt joints of a girder erection section and a girder to be erected is correspondingly adjusted, the rapid butt joint construction of the large-section steel truss girder is realized, and the butt joint quality and the erection work efficiency are improved.
Drawings
FIG. 1 is a schematic view of the arrangement of the vertical surfaces of the butt joint device of a large-section steel truss girder in the embodiment of the invention;
FIG. 2 is a schematic side view of a butt joint device for a large-section steel truss girder according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a schematic top view arrangement of a butt joint device for a large-section steel truss beam according to an embodiment of the invention;
FIG. 4 is a schematic view of the jacking mechanism from the same perspective as FIG. 1;
FIG. 5 is a schematic view of the first counter-pulling mechanism from the same perspective as FIG. 1;
in the figure: 1. a string beam unit; 11. winding; 12. a lower chord; 13. a vertical rod; 14. a diagonal bar; 140. a docking rod; 2. a large cross beam; 3. a first counter-pulling mechanism; 31. a first ear mount; 32. a winding device; 33. a steel cord; 34. a nut; 4. a second counter-pulling mechanism; 5. a jack-up mechanism; 50. a jack-up device; 51. a third ear mount; 52. a shoulder pole beam; 53. a pin shaft; A. a beam section is erected; B. and (5) a beam section to be erected.
Detailed Description
The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.
Examples
Referring to fig. 1 to 3, an embodiment of the present invention provides a large-section steel truss girder butt-joint device, which is used for butt-jointing two large-section steel truss girders, and defining the two large-section steel truss girders as a girder erection section a and a girder erection section B; the large-section steel truss girder comprises:
the bridge structure comprises a plurality of groups of chord beam units 1 arranged in parallel at intervals, wherein each group of chord beam units 1 comprises an upper chord 11, a lower chord 12, at least one vertical rod 13 connected with the upper chord 11 and the lower chord 12, and two butt-joint rods 140 arranged outside all the vertical rods 13;
at least two large beams 2 are arranged between every two adjacent upper chords 11, the two large beams 2 are respectively arranged at two ends of the two upper chords 11, and the large beam 2 in the beam section B to be erected is arranged opposite to the large beam 2 in the beam section A already erected;
the docking device includes:
one end of the first counter-pulling mechanism 3 is connected with one large cross beam 2 in the beam section B to be erected, and the other end of the first counter-pulling mechanism is connected with the corresponding large cross beam 2 in the beam section A already erected; when the first counter-pulling mechanism 3 is in counter-pulling, a large cross beam 2 of the beam section B to be erected approaches to a corresponding large cross beam 2 in the erected beam section A;
two ends of the second counter-pulling mechanism 4 are respectively arranged in the middle of the erected beam section A and the beam section B to be erected; when the second counter-pulling mechanism 4 is in counter-pulling, a counter-connecting rod 140 in the beam section B to be erected approaches to a corresponding counter-connecting rod 140 in the erected beam section a;
a jack-up mechanism 5 including a jack-up 50; the jacking device 50 is arranged on the upper chord 11 in the beam section B to be erected, and the top of the jacking device 50 is fixedly arranged; when the jack 50 jacks upwards, the beam section B to be erected is pressed downwards.
The principles of the present invention will be described below in connection with a docking device and a manner of use of the docking device in accordance with embodiments of the present invention. In the actual construction process, a lifting appliance is used for suspending the beam section B to be erected so as to align and butt the lower chord 12 in the beam section B to be erected with the lower chord 12 in the erected beam section A; the first counter-pulling mechanism 3 is used for counter-pulling the large cross beam 2 in the erected beam section A and the large cross beam 2 in the beam section B to be erected, so that the space distance between one large cross beam 2 of the beam section B to be erected and the corresponding large cross beam 2 in the erected beam section A is shortened, and the space distance between the butt-joint rod 140 in the beam section B to be erected and the corresponding butt-joint rod 140 in the erected beam section A is further preliminarily shortened; using a second counter-pulling mechanism 4 to counter-pull the middle parts of the erected beam section a and the beam section B to be erected, and shortening the spatial distance between a counter-connecting rod 140 in the beam section B to be erected and a corresponding counter-connecting rod 140 in the erected beam section a, so that the counter-connecting rods 140 in the erected beam section a and the counter-connecting rods 140 in the beam section B to be erected are effectively in counter-connection; the upper chord 11 of the beam section B to be erected is pressed down to be flush with the upper chord 11 of the erected beam section A by using the jacking mechanism 5, then the upper chord 11 is in butt joint, and because the upper part of the jacking device 50 is fixedly arranged, when the jacking device 50 jacks upwards, the bottom of the jacking device 50 moves downwards under the action of force, so that the upper chord 11 connected with the jacking device 50 is pressed down, and the purpose of reversely jacking the beam section B to be erected is achieved. The first pair of pulling mechanisms 3, the second pair of pulling mechanisms 4 and the jacking mechanism 5 align and butt the upper chord 11 which is not aligned with the butt joint rod 140, and adjust the relative displacement between the beam section joints, thereby improving the butt joint precision and the butt joint quality.
In the embodiment of the invention, the erected beam section a and the girder section B to be erected are both large-section steel trusses, theoretically, after the lower chord 12 of the girder section B to be erected is butted with the erected beam section a, the upper chord 11 and the butt rod 140 of the girder section B to be erected can be exactly aligned and butted with the erected beam section a, however, in the actual construction process, as for the large-section steel trusses, because a stable structure with large self-weight is formed, after the lower chord 12 of the girder section B to be erected is hoisted, the upper chord 11 and the butt rod 140 of the girder section B to be erected are not actually aligned and have vertical and axial relative deformation, wherein the butt joint of the upper chord 11 in the girder section a to be erected is higher than the height of the upper chord 11 in the erected beam section B, under the condition that the girder section B to be erected cannot be directly aligned and butted with the erected beam section a. By adopting the butt joint device for the large-section steel truss girder provided by the embodiment of the invention, the upper chord 11 and the butt joint rod 140 which are not aligned vertically and axially can be aligned and butted, and the aim of accurate alignment is achieved by shortening and adjusting the relative displacement between joints in the girder section B to be erected and the erected girder section A, so that direct butt joint is carried out, and the butt joint precision and the butt joint quality are effectively improved.
In particular, the jack 50 is a jack. The jack has wide sources and low price, and is beneficial to reducing the economic cost of the butt joint device.
Referring to fig. 1 to 3, in the embodiment of the present invention, each of the erected beam segment a and the beam segment B to be erected to which the butting device is butted includes three groups of beam units 1, each group of beam units 1 includes an upper chord 11, a lower chord 12, two vertical rods 13 vertically arranged in parallel between the upper chord 11 and the lower chord 12, an oblique rod 14 arranged on a diagonal line of the two vertical rods 13, and two butting rods 140 arranged outside all the vertical rods 13, wherein a pair of connecting rods 140 in the beam segment B to be erected can be connected with a corresponding butting rod 140 in the erected beam segment a to form an oblique rod identical to the oblique rod 14. Two large cross beams 2 are arranged between two adjacent upper chords 11, and the two large cross beams 2 are respectively positioned at two ends of the upper chords 11 and are used for being connected with the connected large-section steel truss girders.
As shown in fig. 4, as a further improvement and supplement to this embodiment, the lifting mechanism 5 further includes a shoulder-pole beam 52, one end of which is connected to the upper chord 11 in the erected beam section a, and the other end of which is connected to the upper chord 11 in the beam section B to be erected, and the shoulder-pole beam 52 is fixedly arranged on the top of the lifter 50; when the jack 50 jacks up the shoulder pole beam 52, the upper chord 11 in the beam section B to be strung moves downward. The shoulder pole beam 52 is easy to process and wide in source, and can be fixedly connected with the jack 50 in a welding mode, so that the whole mode is simple and easy to construct. Meanwhile, the carrying pole beam 52 is erected at the top of the jacking device 50, and two ends of the carrying pole beam 52 are fixed, when the length of the jacking device 50 is increased, the jacking device 50 presses the upper chord 11 directly connected with the jacking device 50 downwards due to the fact that the top of the jacking device 50 is limited, so that the upwarped beam section B to be erected can be pressed downwards to be flush with the erected beam section A, and alignment and butt joint of the upper chord 11 are facilitated.
Further, the jacking mechanism 5 further comprises two third ear seats 51 which are respectively and fixedly arranged on the upper chord 11 of the erected beam section a and the upper chord 11 of the beam section B to be erected, and two ends of the shoulder pole beam 52 are respectively and detachably connected with the two third ear seats 51 through pin shafts 53. The third ear seat 51 is arranged on the upper chord 11, and two ends of the shoulder pole beam 52 are detachably and fixedly connected to the upper chord 11 in a pin joint mode, so that the purpose that the jack 50 jacks the beam section B to be erected reversely can be realized, the detachable mode is favorable for the repeated use of the jack-up mechanism 5, when the jack-up mechanism 5 needs to be used, the shoulder pole beam 52 is installed on the third ear seat 51 by using the pin shaft 53, otherwise, the shoulder pole beam 52 can be detached for the next continuous use, the use frequency of parts in the butt joint device is improved, and the expenditure cost of construction facilities is effectively reduced.
As shown in fig. 2 to 3, a jacking mechanism 5 is arranged above each upper chord 11, and meanwhile, two ends of the jacking mechanism 5 are respectively connected with a beam section B to be erected and a beam section a already erected, and a plurality of jacking mechanisms 5 are arranged along the axial direction of the large-section steel truss girder, so that the butt joint of the upper chords 11 on the large-section steel truss girder is accurately butted, the relative displacement between the butt joint surfaces of the whole girder sections is reduced, the butt joint quality of the whole large-section steel truss girder can be ensured, the mismatching of the upper chords is avoided, and the butt joint precision is improved.
Referring to fig. 5, as a first embodiment of the first pair of pulling mechanisms in the embodiment of the present invention, the first pair of pulling mechanisms 3 includes a steel cable 32 and a jack 33, and two ends of the steel cable 32 are respectively connected to two opposite large beams 2; the jack 33 is disposed at one end of the steel cable 32 for contracting the length of the steel cable 32. The two oppositely arranged large beams are oppositely pulled through the jack 33, the space distance of the large beam 2 is shortened, and the space distance between the beam sections B to be erected and the butt-joint rods 140 in the middle of the erected beam section A is shortened at intervals.
Further, the first counter-pulling mechanism further comprises two first ear seats 31 which are fixedly arranged on the erected beam section a and the beam section B to be erected respectively, and each first ear seat 31 is detachably connected with one steel rope 32. Specifically, two ends of the steel cable 32 respectively penetrate through the two first ear seats 31, one end of the steel cable is fastened through a nut 34, the other end of the steel cable is connected to a jack 33, the length of the steel cable 32 is adjusted and contracted through the jack 33, so as to realize the counter-pulling of the two large cross beams 2, and in the embodiment, the detachable mode is favorable for the repeated use of the first counter-pulling mechanism.
As a second implementation manner of the first counter-pulling mechanism in the embodiment of the present invention, the first counter-pulling mechanism includes two lug seats, two winding devices, and a steel rope, the two lug seats are respectively and fixedly disposed on the erected beam section a and the to-be-erected beam section B, each lug seat is detachably connected to one winding device, and two ends of the steel rope are respectively connected to the two winding devices and can be wound around the winding devices. This embodiment is already known in the art and is therefore not illustrated in the drawings of the description. First mechanism of drawing adopts the mode of rolling steel cable to draw two crossbeams that set up relatively, shorten the spatial distance of crossbeam, the interval shortens to treat a beam section B, the spatial distance between the butt joint pole at frame beam section A middle part, secondly, link firmly on the crossbeam with the detachable mode through with the coiling mechanism, not only can realize treating a beam section B, the purpose of frame beam section A to drawing, and, the detachable mode is favorable to the used repeatedly of first mechanism of drawing, when needs use first mechanism of drawing, install the coiling mechanism on the ear seat, otherwise, then can pull down first mechanism of drawing in order to supply to continue to use next time, improve the frequency of use of spare part among the butt joint device, effectively reduce construction facilities's expenditure cost.
As a third implementation manner of the first pair of pulling mechanisms in the embodiment of the present invention, the first pair of pulling mechanisms 3 includes a steel wire rope and a hydraulic tensioning device, the beam section B to be erected is provided with a hole, one end of the steel wire rope is fixedly connected to a large cross beam 2 of the beam section a to be erected, and the other end of the steel wire rope penetrates through the hole and is connected to the hydraulic tensioning device, and the length of the steel wire rope is adjusted by controlling the hydraulic tensioning device, so as to shorten the spatial distance between the large cross beam 2 of the beam section B to be erected and the corresponding large cross beam 2 of the beam section a to be erected.
Referring to fig. 2-3, the uniform distribution has two first pair to draw mechanism 3 on every big crossbeam 2, and the first pair of quantity of drawing mechanism 3 of rational layout can carry out accurate butt joint with the big crossbeam 2 that the span is great wholly, realizes the accurate butt joint of whole big crossbeam 2 on great span, further improves the butt joint quality. Meanwhile, the first counter-pulling mechanism 3 is arranged on the upper surface of the large cross beam 2, the jacking mechanism 5 is arranged on the upper chord 11, and most of operation surfaces of the counter-pulling mechanism or the jacking mechanism are arranged on the top of the steel truss girder, so that the construction operability and the safety performance of high-altitude operation are improved.
Referring to fig. 1, as a preferable mode of the embodiment of the present invention, one end of the second counter-pulling mechanism 4 is connected to the butt-joint rod 140 of the erected beam segment a, and the other end is connected to the vertical rod 13 of the beam segment B to be erected near the butt-joint rod 140. One end of the second counter-pulling mechanism 4 is fixed on the vertical rod 13 of the beam section B to be erected, and the other end is fixed on the butt joint rod 140 of the erected beam section A, and the implementation mode is simple and easy to operate by combining the vertical and axial relative displacement of the butt joint rod 140. Specifically, one end of the second counter-pulling mechanism 4 is disposed in the middle or on the upper point of the vertical rod 13 of the beam section B to be erected, and the other end is disposed at the free end of the butt-joint rod 140 in the erected beam section a, so that the interference of the butt-joint rod 140 opposite to the butt-joint rod 140 in the erected beam section a in the beam section B to be erected in the counter-pulling process can be effectively avoided.
In the embodiment of the present invention, the second counter-pulling mechanism 4 is similar to the first counter-pulling mechanism 3, and the second counter-pulling mechanism 4 includes a second ear seat, a second winding mechanism, and a second steel rope, so that the second counter-pulling mechanism 4 is not shown in the drawings of the specification, and the specific structure of the second counter-pulling mechanism 4 is not described in detail herein, and of course, the second counter-pulling mechanism 4 may also be any counter-pulling structure in the prior art. When the distance between the two ends of the second counter-pulling mechanism 4 is the shortest distance that can be achieved, the tension capability is stronger when the counter-pulling mechanism is installed at other positions relative to the second counter-pulling mechanism 4, and therefore, the arrangement can effectively tension the rod 140.
As another way of the embodiment of the present invention, one end of the second counter-pulling mechanism 4 is disposed on the butt-joint rod 140 of the beam segment B to be erected, and the other end is disposed on the butt-joint rod 140 of the erected beam segment a opposite to the butt-joint rod 140 of the beam segment B to be erected, in this way, the distance of the steel rope in the second counter-pulling mechanism 4 can be minimized, which is beneficial for pulling, and this embodiment is not illustrated in the drawings of the specification.
According to the butt joint device for the large-section steel trusses, the sources of the opposite pulling mechanism and the jacking mechanism are conventional facilities, and when the mechanisms are reasonably arranged on the large-section steel trusses and matched with each other, the two large-section steel trusses can be effectively butted, the relative displacement between beam section joints is adjusted, and therefore the butt joint precision and the butt joint quality are improved.
For the butt joint of large-section steel trussed beams, in the construction of a bridge, the butt joint needs to be carried out for multiple times, and the first lug seat 31, the second lug seat and the third lug seat 51 in the butt joint device are arranged on the steel trussed beams in advance, so that the hoisting operation is not influenced, and the construction period is saved; but also can effectively and repeatedly use the butt joint parts in the butt joint device, save the construction cost in the butt joint construction, and has high popularization and application values aiming at the erection of the large-section steel truss girder.
Referring to fig. 1 to 2, an embodiment of the present invention further provides a second aspect, and an embodiment of the present invention further provides a butt joint device for large-section steel trusses, which is used for butt joint of two large-section steel trusses to define two large-section steel trusses as a beam erected section a and a beam to be erected section B; the large-section steel truss girder comprises:
the bridge structure comprises a plurality of groups of chord beam units 1 arranged in parallel at intervals, wherein each group of chord beam units 1 comprises an upper chord 11, a lower chord 12, at least one vertical rod 13 connected with the upper chord 11 and the lower chord 12, and two butt-joint rods 140 arranged outside all the vertical rods 13;
at least two large beams 2 are arranged between every two adjacent upper chords 11, and the large beam 2 in the beam section B to be erected is opposite to the large beam 2 in the beam section A already erected;
the docking device includes:
one end of the first counter-pulling mechanism 3 is used for being connected with one large cross beam 2 in the erected beam section A, and the other end of the first counter-pulling mechanism is used for being connected with the corresponding large cross beam 2 in the beam section B to be erected;
two ends of the second counter-pulling mechanism 4 are respectively arranged in the middle of the erected beam section A and the beam section B to be erected;
a jack-up mechanism 5 including a jack-up 50; the bottom of the jack 50 is used for being arranged on the upper chord 11 in the beam section B to be erected, and the top of the jack is used for being fixedly arranged; the jack 50 is used for pressing the beam section B to be erected downwards when jacking upwards.
The embodiment of the invention provides a butting device in a non-construction state, when the butting device is used, the first pair of pulling mechanisms 3, the second pair of pulling mechanisms 4 and the jacking mechanism 5 align and butt the upper chord 11 which is not aligned with the butting rod 140, and adjust the relative displacement between the beam section joints, thereby improving the butting precision and the butting quality.
The embodiment of the invention also provides a butt joint method of the large-section steel truss girder, which is realized by the butt joint device, and the butt joint method comprises the following steps:
step 1: aligning and butting all lower chords 12 in the beam section B to be erected with all lower chords 12 in the beam section A already erected;
step 2: using a first counter-pulling mechanism 3 to counter-pull the large cross beam 2 in the beam section B to be erected and the beam section A already erected, and roughly aligning the butt joint rod 140 in the beam section B to be erected and the butt joint rod 140 in the beam section A already erected;
and step 3: using a second opposite-pulling mechanism 4 to oppositely pull the middle parts of the beam section B to be erected and the erected beam section A, and accurately aligning and abutting the abutting rod 140 in the beam section B to be erected and the abutting rod 140 in the erected beam section A;
and 4, step 4: and (3) jacking upwards by using a jacking device 50 in the jacking mechanism 5, pressing down the upper chord 11 in the beam section B to be erected, aligning and butting the upper chord 11, and thus completing the butting of the large-section steel truss beam.
In order to further improve the docking quality, further, the specific steps of step 4 include:
step 401: the first counter-pulling mechanism 3 is used again for counter-pulling the beam section B to be erected and the large cross beam 2 in the erected beam section A, and the upper chord 11 in the beam section B to be erected and the upper chord 11 in the erected beam section A are roughly aligned;
step 402: and (3) jacking upwards by using a jack 50 in the jacking mechanism 5, pressing down the upper chord 11 in the beam section B to be erected, and accurately aligning and butting the upper chord 11 in the beam section B to be erected and the upper chord 11 in the beam section A to be erected.
Specifically, the first counter-pulling mechanism 3 comprises a first ear seat 31, the second counter-pulling mechanism 4 comprises a second ear seat, and the jack-up mechanism 5 comprises a third ear seat 51; the step 1 further comprises:
before the lower chord 12 is butted, the first ear seat 31, the second ear seat and the third ear seat 51 are all preset on the beam section A to be erected and the beam section B to be erected.
In the embodiment of the invention, the method is according to the specific order, namely, the coarse adjustment and the fine adjustment are firstly carried out to butt joint the butt joint rod 140, the upper chord 11 is butted, the relative deformation between the butt joint of the erected beam section and the beam section to be erected is correspondingly adjusted, the rapid butt joint construction of the large-section steel truss beam is realized, the butt joint quality and the erection work efficiency are improved, the parts used in the butt joint method are simple and easy to obtain, the butt joint method is simple, and the large-section steel truss beam can be effectively and rapidly butted; secondly, predetermine first ear seat 31, second ear seat, third ear seat 51, can dismantle the interfacing apparatus with large section steel truss and be connected, be favorable to the interfacing apparatus to supply to dock the continuation in the next time and use, improve the frequency of use of spare part in the interfacing apparatus, effectively reduce construction facilities's expenditure cost.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (7)
1. A butt joint device of a large-section steel truss girder is used for butt joint of two large-section steel truss girders and defines the two large-section steel truss girders as a girder erection section (A) and a girder erection section (B); the large-section steel truss girder comprises:
the device comprises a plurality of groups of chord beam units (1) which are arranged in parallel at intervals, wherein each group of chord beam units (1) comprises an upper chord (11), a lower chord (12), at least one vertical rod (13) which is connected with the upper chord (11) and the lower chord (12) and two butt-joint rods (140) which are arranged on the outer sides of all the vertical rods (13);
the large cross beams (2) are arranged between every two adjacent upper chords (11), the two large cross beams (2) are respectively arranged at two ends of the two upper chords (11), and the large cross beam (2) in the beam section (B) to be erected is opposite to the large cross beam (2) in the beam section (A) already erected;
characterized in that, the interfacing apparatus comprises:
one end of the first counter-pulling mechanism (3) is connected with one large cross beam (2) in the beam section (B) to be erected, and the other end of the first counter-pulling mechanism is connected with the corresponding large cross beam (2) in the beam section (A) already erected; when the first counter-pulling mechanism (3) is in counter-pulling, a large cross beam (2) of the beam section (B) to be erected approaches to a corresponding large cross beam (2) of the erected beam section (A);
two ends of the second counter-pulling mechanism (4) are respectively arranged in the middle of the erected beam section (A) and the beam section (B) to be erected; when the second counter-pulling mechanism (4) is in counter-pulling, a counter-connecting rod (140) in the beam section (B) to be erected approaches to a corresponding counter-connecting rod (140) in the erected beam section (A);
a jack-up mechanism (5) including a jack-up (50); the jacking device (50) is arranged on the upper chord (11) in the beam section (B) to be erected, and the top of the jacking device (50) is fixedly arranged; when the jack (50) jacks upwards, the beam section (B) to be erected is pressed downwards;
the jack-up mechanism (5) further comprises:
one end of the shoulder pole beam (52) is connected with the upper chord (11) in the erected beam section (A), the other end of the shoulder pole beam (52) is connected with the upper chord (11) in the beam section (B) to be erected, and the shoulder pole beam (52) is fixedly arranged at the top of the jack (50); when the jack (50) jacks up the shoulder pole beam (52), the upper chord (11) in the beam section (B) to be erected moves downwards;
the first counter-pulling mechanism (3) comprises:
two ends of the steel rope (32) are respectively connected with the two large beams (2) which are opposite;
a jack (33) provided at least one end of the steel rope (32) for contracting the length of the steel rope (32).
2. The butt-joint device of a large-section steel truss as claimed in claim 1, wherein the jacking mechanism (5) further comprises:
and the two third ear seats (51) are fixedly arranged on the upper chord (11) of the erected beam section (A) and the upper chord (11) of the beam section (B) to be erected respectively, and two ends of the shoulder pole beam (52) are detachably connected with the two third ear seats (51) respectively through pin shafts (53).
3. The butt joint device of a large-section steel truss as claimed in claim 1, wherein the first counter-pulling mechanism (3) further comprises:
the two first lug seats (31) are fixedly arranged on the erected beam section (A) and the beam section (B) to be erected respectively, and each first lug seat (31) is detachably connected with one steel rope (32).
4. The butt joint device of the large-section steel truss girder according to claim 1, wherein one end of the second counter-pulling mechanism (4) is connected with the butt joint rod (140) in the erected girder section (a), and the other end is connected with the vertical rod (13) close to the butt joint rod (140) in the girder section (B) to be erected.
5. A butt joint method of a large-section steel truss girder, wherein the butt joint method is realized by the butt joint device according to claim 1, and the butt joint method comprises the following steps:
step 1: aligning and butting all lower chords (12) in the beam section (B) to be erected with all lower chords (12) in the beam section (A) already erected;
step 2: a first counter-pulling mechanism (3) is used for counter-pulling a beam section (B) to be erected and a large cross beam (2) in the erected beam section (A), and a butt joint rod (140) in the beam section (B) to be erected and a butt joint rod (140) in the erected beam section (A) are roughly aligned;
and step 3: using a second counter-pulling mechanism (4) to counter-pull the middle parts of the beam section (B) to be erected and the erected beam section (A), and accurately aligning and butting the butting rod (140) in the beam section (B) to be erected and the butting rod (140) in the erected beam section (A);
and 4, step 4: and (3) jacking upwards by using a jacking device (50) in the jacking mechanism (5), pressing down the upper chord (11) in the beam section (B) to be erected, aligning and butting the upper chord (11), and thus completing the butting of the large-section steel truss beam.
6. The butt joint method of the large-section steel truss girder according to claim 5, wherein the specific steps of the step 4 comprise:
step 401: secondly, the first counter-pulling mechanism (3) is used for counter-pulling the beam section (B) to be erected and the large cross beam (2) in the erected beam section (A), and the upper chord (11) in the beam section (B) to be erected and the upper chord (11) in the erected beam section (A) are roughly aligned;
step 402: and (3) jacking upwards by using a jacking device (50) in the jacking mechanism (5), pressing down the upper chord (11) in the beam section (B) to be erected, and accurately aligning and butting the upper chord (11) in the beam section (B) to be erected and the upper chord (11) in the erected beam section (A).
7. The method of docking a large section steel truss girder according to claim 5, wherein the first counter-pulling mechanism (3) comprises a first ear seat (31), the second counter-pulling mechanism (4) comprises a second ear seat, and the jacking mechanism (5) comprises a third ear seat (51); the step 1 further comprises:
and before the lower chord (12) is butted, the first ear seat (31), the second ear seat and the third ear seat (51) are all preset on the erected beam section (A) and the beam section (B) to be erected.
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| CN111188273A (en) * | 2019-12-31 | 2020-05-22 | 湖北省路桥集团有限公司 | Large-section steel truss girder erection system of large-span steel-concrete composite bridge and construction method |
| CN113123250B (en) * | 2021-05-10 | 2023-03-14 | 南通帆森能源科技有限公司 | Precise assembling and adjusting device for steel truss girder and assembling construction method |
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