CN113802462B - Joint bridging machine and front lifting leg thereof - Google Patents
Joint bridging machine and front lifting leg thereof Download PDFInfo
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- CN113802462B CN113802462B CN202111139766.4A CN202111139766A CN113802462B CN 113802462 B CN113802462 B CN 113802462B CN 202111139766 A CN202111139766 A CN 202111139766A CN 113802462 B CN113802462 B CN 113802462B
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- leg
- telescopic
- portal
- bridge girder
- girder erection
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/06—Methods or apparatus specially adapted for erecting or assembling bridges by translational movement of the bridge or bridge sections
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Abstract
The invention discloses a front landing leg of a crane, which comprises an upper cross beam, landing legs and supporting legs. Two sets of landing legs are installed on the entablature at intervals, and the landing leg includes flexible stand and portal, and the one end slidable of flexible stand is installed on the entablature to adjust the interval of two sets of landing legs, the portal can be dismantled with the other end of flexible stand and be connected, and the stabilizer blade can be dismantled with the portal and be connected. When the front landing leg of the crane is supported on the pier top, the portal frame is connected with the telescopic upright post and the supporting leg; when the front landing leg of the crane is supported on the bridge deck, the portal frame is dismantled to connect the support legs with the telescopic upright posts. The invention also discloses a joint bridge girder erection machine, which comprises the front hanging leg. The section-spliced bridge girder erection machine and the front hanging support leg thereof solve the supporting problem of the traditional bridge girder erection machine on the top of a narrow pier, and can comprehensively realize the suspension construction of the front guide beam of the bridge girder erection machine under different working conditions, thereby obviously improving the construction work efficiency and the economic benefit.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a joint bridge girder erection machine and a front lifting leg thereof.
Background
When the bridge girder erection machine is constructed by the traditional full-hanging or T-shaped construction process, the segments (commonly called as 0# blocks or pier top blocks) at the top of the pier body are firstly installed, are fixedly connected with cast-in-situ concrete at the top of the pier column in a cast-in-situ manner and are used for supporting leg stations in the bridge girder erection machine, and then the assembly construction of the segment girders is started.
However, the existing bridge section beams have slightly different installation sequences, firstly, middle section erection is carried out, a simply supported beam state is formed after prestress construction, then temporary supports are installed for supporting, a bridge girder erection machine is longitudinally moved to the next span after unloading, after the second span of simply supported beams are formed, pier top sections are installed, and finally wet joint construction (the wet joints are positioned at the pier top positions) is finished, namely, the construction process of simply supporting before continuing is achieved.
However, since the width of the supporting leg in the bridge girder erection machine in the longitudinal bridge direction is 3.2m, the pier top block installation area is only 1.4m wide, the station requirements of the middle supporting leg are not met, then the suspension construction can not be carried out by utilizing the guide beam between the two middle supporting legs, and the design and configuration of the traditional bridge girder erection machine do not meet the construction requirements.
Disclosure of Invention
Based on the problems, the middle supporting leg of the traditional bridge girder erection machine cannot be positioned at the pier top block, and then suspension construction cannot be carried out by utilizing a guide beam between the two middle supporting legs, the bridge girder erection machine and the front supporting leg for hoisting the bridge girder erection machine are provided.
A front sling leg comprising:
an upper cross beam;
the support legs are arranged on the upper cross beam at intervals, each support leg comprises a telescopic upright post and a portal frame, one end of each telescopic upright post is slidably arranged on the upper cross beam so as to adjust the distance between the two groups of support legs, and the portal frame is detachably connected with the other end of each telescopic upright post; a kind of electronic device with high-pressure air-conditioning system
The support legs are detachably connected with the door frame;
when the front landing leg of the crane is supported on the pier top, the portal frame is connected with the telescopic upright post and the supporting leg; and when the front landing leg of the crane is supported on the bridge deck, the portal frame is dismantled to connect the support legs with the telescopic upright posts.
In one embodiment, the bridge girder erection machine further comprises a pressing plate, wherein the pressing plate is mounted on the upper cross beam and is used for being connected with the guide girder of the bridge girder erection machine.
In one embodiment, the support leg further comprises a swing frame slidably mounted on the upper beam, and one end of the telescopic upright is connected with the swing frame.
In one embodiment, the swing frame is provided with a main pin shaft and two auxiliary pin shafts, the two auxiliary pin shafts are symmetrically arranged relative to the main pin shaft, the main pin shaft and the auxiliary pin shafts are connected with the telescopic upright post, the main pin shaft is in a tight fit state, the auxiliary pin shafts are in a floating state, and when the telescopic upright post inclines relative to the swing frame, the auxiliary pin shafts are stressed to prevent the telescopic upright post from inclining.
In one embodiment, the rocker is slidably mounted on the upper cross beam by a change gear mechanism that is anchored to the upper cross beam by a bolt.
In one embodiment, the telescopic column comprises a telescopic joint and a driving piece, the telescopic joint is connected with the swing frame, the portal frame is detachably connected with the telescopic joint, and the driving piece is used for driving the telescopic joint to stretch out and draw back.
In one embodiment, the telescopic joint comprises an outer telescopic sleeve, an inner telescopic rod and a bolt, the outer telescopic sleeve is connected with the swing frame, the inner telescopic rod is movably inserted into the outer telescopic sleeve, the door frame is detachably connected with the inner telescopic rod, the outer telescopic sleeve is provided with a first jack, the inner telescopic rod is provided with a second jack, and the bolt is sequentially inserted into the first jack and the second jack to lock the telescopic joint.
In one embodiment, the support leg comprises a connecting seat, an adjusting screw and a spherical seat, wherein the connecting seat is detachably arranged on the portal, one end of the adjusting screw is screwed into the connecting seat, and the other end of the adjusting screw is connected with the spherical seat.
In one embodiment, the spherical seat is provided with an arc-shaped protrusion, the end face of the adjusting screw is provided with a groove matched with the arc-shaped protrusion, and the arc-shaped protrusion is inserted into the groove and locked by a screw.
A joint bridge girder erection machine comprising:
a sling front leg as defined in any one of the preceding claims.
The section-spliced bridge girder erection machine and the front lifting support leg thereof can be supported on the pier top, so that the supporting problem of the traditional bridge girder erection machine on the narrow pier top is solved, and meanwhile, the bridge girder erection machine can be supported and anchored on the bridge deck, and the front guide girder suspension construction of the bridge girder erection machine can be comprehensively realized under different working conditions. The front guide beam hanging construction is carried out by adopting the front hanging support leg, the link of installing the pier top block in advance is omitted, the time of waiting for pouring and maintaining a wet joint is not needed, the next station can be directly crossed, the construction work efficiency is obviously improved, and the economic benefit is obviously improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described. Throughout the drawings, the elements or portions are not necessarily drawn to actual scale.
FIG. 1 is a schematic diagram of a bridge set up of a pitch bridge girder erection machine in an embodiment;
FIG. 2 is a schematic view of the front leg of the sling of FIG. 1 supported on the pier top;
FIG. 3 is a side view of the front leg of the sling of FIG. 2;
FIG. 4 is an enlarged view of a portion of FIG. 3 at A;
FIG. 5 is a schematic illustration of the connection of the swing frame of FIG. 3 to a telescoping mast;
FIG. 6 is a partial enlarged view at B in FIG. 3;
FIG. 7 is a schematic view of the foot of FIG. 2;
FIG. 8 is a schematic view of the front leg of the sling of FIG. 1 supported on a deck;
FIG. 9 is a schematic view of the front leg of the sling of FIG. 2 supported on the pier top with a ladder platform;
fig. 10 is a schematic view of the front leg of the sling of fig. 2 supported on a deck with a ladder platform.
Reference numerals:
10-hanging front support leg, 110-upper beam, 112-boss, 120-support leg, 121-telescopic upright, 122-portal, 123-telescopic joint, 1231-outer telescopic sleeve, 1232-inner telescopic rod, 1233-insert rod, 1234-first insert hole, 1235-second insert hole, 124-driving piece, 125-first mounting plate, 126-second mounting plate, 127-connecting rod, 130-support leg, 131-connecting seat, 132-adjusting screw, 133-spherical seat, 134-baffle, 135-arc-shaped bulge, 140-pressing plate, 150-swing frame, 152-main pin, 154-auxiliary pin, 160-change gear mechanism, 162-connecting frame, 164-roller, 170-anchor, 182-crawling ladder, 184-walking ladder, 20 guide beam, 30-middle support leg, 40-rear support leg, 50-lifting crane and 60-driving.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit or scope of the invention, which is therefore not limited to the specific embodiments disclosed below.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1, a bridge girder erection machine in an embodiment includes a front leg 10 for hoisting. In one embodiment, the joint bridge girder erection machine further comprises a guide beam 20, a middle supporting leg 30, a rear supporting leg 40, a crane crown 50 and a crane 60, wherein the front supporting leg 10, the middle supporting leg 30 and the rear supporting leg 40 are sequentially arranged on the guide beam 20, and the middle supporting leg 30 is positioned between the front supporting leg 10 and the rear supporting leg 40. The crane crown block 50 and the crane 60 are arranged at the top of the guide beam 20, the crane crown block 50 is responsible for hoisting the section beam, the rated hoisting capacity is 250t, the crane 60 is responsible for hoisting the lifting appliance, the materials and the like, and the hoisting capacity is 20t.
Referring to fig. 2 and 3, in one embodiment, the front sling leg 10 includes a top rail 110, a leg 120, and a foot 130. The upper beam 110 is installed at the bottom of the front end of the guide beam 20. In one embodiment, the front hanging leg 10 further includes a pressing plate 140, where the pressing plate 140 is mounted on the upper beam 110, and the pressing plate 140 is anchored at the front end of the guide beam 20, so that the upper beam 110 is mounted at the front end of the guide beam 20. In one embodiment, the platen 140 is anchored to the front end of the guide beam 20 by 64M 30 studs with a 500n.m pre-load torque at a distance of 4.015M from the end.
The supporting legs 120 are installed on the upper beam 110, the supporting legs 120 are provided with two groups, and the two groups of supporting legs 120 are arranged at intervals. The support legs 120 include a telescopic column 121 and a gantry 122, and one end of the telescopic column 121 is slidably mounted on the upper beam 110 to adjust the distance between the two sets of support legs 120.
In one embodiment, the leg 120 further includes a swing frame 150, the swing frame 150 is slidably mounted on the upper beam 110, and one end of the telescopic column 121 is connected to the swing frame 150, so that the telescopic column 121 is slidably mounted on the upper beam 110.
Referring to fig. 4, further, the swing frame 150 is slidably mounted on the upper beam 110 through a gear mechanism 160, where the gear mechanism 160 has two sets of gear mechanisms 160, and the two sets of gear mechanisms 160 are respectively located on two opposite sides of the upper beam 110. The change gear mechanism 160 slides on the upper beam 110, and is positioned and anchored on the upper beam 110 by bolts after adjusting the interval between the two sets of legs 120.
In an embodiment, the change gear mechanism 160 includes a connecting frame 162 and rollers 164, the connecting frame 162 is connected with the swing frame 150, the rollers 164 are rotatably installed on the connecting frame 162, the upper beam 110 is provided with two bosses 112, the two bosses 112 are respectively located at two opposite sides of the upper beam 110, and the rollers 164 of the two sets of change gear mechanisms 160 are respectively disposed on the two bosses 112 in a rolling manner, so that the change gear mechanism 160 and the upper beam 110 can be prevented from being separated. The bolts can anchor the connecting frame 162 and the upper beam 110, so as to realize positioning and anchoring of the change gear mechanism 160 on the upper beam 110.
Referring to fig. 5, in an embodiment, a main pin 152 and two auxiliary pins 154 are installed on the swing frame 150, and the two auxiliary pins 154 are symmetrically disposed about the main pin 152. The main pin shaft 152 and the auxiliary pin shaft 154 are connected with the telescopic upright post 121, so that the telescopic upright post 121 and the swing frame 150 are connected. The primary pin 152 is permanently in a tight fit condition, while the secondary pin 154 is normally in a floating condition and is not functional.
Specifically, the telescopic upright 121 is provided with a pin hole, the main pin shaft 152 and the auxiliary pin shaft 154 are arranged in the pin hole in a penetrating manner, the diameter of the main pin shaft 152 is the same as that of the pin shaft penetrating through the main pin shaft 152, so that the main pin shaft 152 is in a tight fit state, and the diameter of the auxiliary pin shaft 154 is smaller than that of the pin hole penetrating through the auxiliary pin shaft 154, so that the auxiliary pin shaft 154 is in a floating state. The telescopic column 121 can rotate relative to the swing frame 150, can adapt to the inclination of the guide beam 20, and the support leg 120 automatically maintains a vertical state.
Specifically, when the support leg 120 is inclined abnormally, the telescopic upright 121 is inclined relative to the swing frame 150, the auxiliary pin shaft 154 contacts with the side wall of the pin hole to bear force, and the telescopic upright 121 is prevented from being inclined relative to the swing frame 150, so that the support safety of the support leg 120 is ensured. Specifically, in the present embodiment, the diameter of the main pin 152 is 150mm, and the diameter of the auxiliary pin 154 is 70mm.
Referring again to fig. 2, the telescopic column 121 can telescopically adjust the length of the leg 120 to accommodate the deck gradient. In one embodiment, the telescopic column 121 includes a telescopic joint 123 and a driving member 124, where the telescopic joint 123 is connected to the swing frame 150, and the driving member 124 is used to drive the telescopic joint 123 to stretch and retract. In one embodiment, each telescopic column 121 comprises two groups of telescopic joints 123, the two groups of telescopic joints 123 are arranged at intervals, and the driving piece 124 is located between the two groups of telescopic joints 123.
Referring to fig. 6, in one embodiment, the telescopic joint 123 includes an outer telescopic sleeve 1231, an inner telescopic rod 1232 and a plug rod 1233. An outer telescoping sheath 1231 is connected to the swing frame 150. Specifically, outer telescoping sheath 1231 is connected to main pin 152 and auxiliary pin 154, allowing outer telescoping sheath 1231 to be connected to rocker 150. The inner telescopic rod 1232 is movably inserted into the outer telescopic sleeve 1231, and the length of the telescopic joint 123 can be adjusted by moving the inner telescopic rod 1232 relative to the outer telescopic sleeve 1231. The outer telescoping sleeve 1231 is provided with a plurality of first receptacles 1234 axially spaced apart therealong, the inner telescoping rod 1232 is provided with a plurality of second receptacles 1235 axially spaced apart therealong, and the insert rods 1233 are sequentially inserted into the first receptacles 1234 and the second receptacles 1235 to lock the telescoping joint 123.
On the basis of the above embodiment, further, the number of the second jacks 1235 is 6, the interval between the second jacks 1235 is 200mm, so that the total adjusting height of the telescopic joint 123 is 200mm×6=1200 mm, the number of the first jacks 1234 is 4, and the interval between the first jacks 1234 is 300mm, so that the adjusting precision is reduced from 200mm to 100mm, and the accurate height adjustment is more convenient. The first jack 1234 is in the shape of a key hole with a small upper part and a large lower part, and the second jack 1235 is internally provided with a sleeve, so that the two measures are very convenient for the hole alignment operation of the outer telescopic sleeve 1231 and the inner telescopic rod 1232.
Referring to fig. 2 again, in an embodiment, the driving member 124 is an oil cylinder, a cylinder body of the driving member 124 is connected with the outer telescopic sleeve 1231, a piston rod of the driving member 124 is connected with the inner telescopic rod 1232, and the inner telescopic rod 1232 can be driven to move relative to the outer telescopic sleeve 1231 by the telescopic operation of the driving member 124, so as to drive the telescopic joint 123 to extend and retract.
In one embodiment, the outer sleeves 1231 of the two sets of expansion joints 123 are integrally connected by a first mounting plate 125, the first mounting plate 125 is connected to the rocker 150, and the inner rods 1232 of the two sets of expansion joints 123 are integrally connected by a second mounting plate 126. The cylinder of the driving member 124 is mounted on a first mounting plate 125 and the piston rod of the driving member 124 is connected to a second mounting plate 126.
It will be appreciated that in other embodiments, the driver 124 may have other configurations, so long as it is capable of driving the inner telescoping rod 1232 to telescope relative to the outer telescoping sheath 1231. For example, the driver 124 may also be a cylinder, or an electric push rod.
Referring to fig. 8, the gantry 122 is detachably connected to the other end of the telescopic column 121, and the support legs 130 are detachably connected to the gantry 122. Wherein, when the front landing leg 10 of the crane is supported on the pier top, the portal 122 is connected with the telescopic upright post 121 and the supporting leg 130, so as to complete the erection of the section beam under normal condition. Because the segmental beams are connected with the steel beams, working conditions of erection and closure segments exist, the bridge girder erection machine is longitudinally moved on the bridge deck after all the bridges are penetrated, the front supporting legs 10 are required to be hung on the bridge deck, when the front supporting legs 10 are hung on the bridge deck, the door frame 122 is partially dismantled, the distance between the supporting legs 120 is adjusted to be matched with the position of the segmental beam web, and the supporting legs 130 are connected with the telescopic upright posts 121.
In one embodiment, the portal 122 is connected to the second mounting plate 126 through a connecting bolt, so that the portal 122 is detachably connected to the telescopic column 121, the supporting leg 130 is detachably connected to the portal 122 through a connecting bolt, and the supporting leg 130 is detachably connected to the telescopic column 121 through a connecting bolt. The mast 122 is provided with a connecting rod 127, the connecting rods 127 of the two masts 122 being connected to each other, maintaining the two sets of legs 120 as a whole.
When the front lifting leg 10 is supported on the pier top, the front lifting leg must be anchored with the pier top. In one embodiment, the front sling leg 10 further includes an anchor 170, one end of the anchor 170 being secured to the portal 122 and the other end of the anchor 170 being anchored to the pier top. Specifically, the anchor 170 may be an anchor rod or an anchor cable, and one end of the anchor rod 170 is fixed to the connection rod 127. The anchors 170 are provided on opposite sides of the portal 122, and the two portal 122 connect the portal 122 and the pier top embedded part into a whole through 4 phi 40 finish-rolled twisted steel bars.
Referring to fig. 7, in an embodiment, the supporting leg 130 includes a connecting base 131, an adjusting screw 132 and a spherical base 133, the connecting base 131 is detachably mounted on the gantry 122, one end of the adjusting screw 132 is screwed into the connecting base 131, and the other end of the adjusting screw 132 is connected to the spherical base 133. The adjusting screw 132 adopts a trapezoidal threaded connection pair, so that the accurate fine adjustment of the whole height of the front landing leg 10 of the crane can be realized.
On the basis of the above embodiment, the end surface of the adjusting screw 132 located in the connecting seat 131 is provided with the baffle 134, and the baffle 134 can prevent the adjusting screw 132 from being unscrewed too long, so that the number of screwing turns is reduced, and the safety of the equipment is affected. The spherical seat 133 is provided with an arc-shaped protrusion 135, the end surface of the adjusting screw 132 is provided with a groove matched with the arc-shaped protrusion 135, and the arc-shaped protrusion 135 is inserted into the groove and locked by a screw. The arc-shaped protrusion 135 arranged on the spherical seat 133 can meet the requirement of non-planar support, and the maximum adaptation gradient is 2.5%.
Referring to fig. 9 and 10, in one embodiment, the front lifting leg 10 further includes a ladder platform including a crawling ladder 182 and a walking ladder 184, wherein the crawling ladder 182 and the walking ladder 184 are connected to the telescopic column 121. Specifically, the crawling ladder 182 and the walking ladder 184 are connected with the second mounting plate 126.
When the front lifting support leg 10 is supported on the pier top, the front lifting support leg 10 is in a complete assembly state, and the ladder platform mainly meets the requirements of passing of constructors in three working areas of a bridge girder erection machine, the pier top and a bridge deck. When the front landing leg 10 is supported on the bridge deck, the overall height is reduced, the supporting distance is changed, the crawling ladder 182 is removed, and the ladder platform in the state mainly meets the passing of constructors in two working areas of the bridge girder erection machine and the bridge deck.
The section splicing bridge girder erection machine and the front hanging leg 10 thereof solve the supporting problem of the traditional bridge girder erection machine on the narrow pier top, can support and anchor the bridge girder at the bridge deck, and can comprehensively realize the suspension construction of the front guide beam 20 of the bridge girder erection machine under different working conditions, namely, the section girder erection is completed between the front hanging leg 10 and the middle supporting leg 30. Compared with the traditional construction method, after the front hanging support leg 10 is applied to the joint bridge girder erection machine, the economic benefit and the construction work efficiency are improved, and the concrete steps are as follows:
the cost of a newly manufactured set of front supporting legs 10 for hanging weights is 95 ten thousand yuan, and the bridge girder erection machine is assisted to realize the hanging construction of the front guide girder 20. If the traditional scheme is adopted, the two middle supporting legs of the bridge girder erection machine are required to be used for suspension construction, and the direct construction is difficult under the working conditions of narrow pier tops and rear mounting pier top blocks. If the scheme is changed, the pier top block sections are installed first, and then the bridge girder erection machine is supported on the pier top blocks for construction. The cost and difficulty caused by the changing scheme are not considered temporarily, the pier top block is required to be installed in advance by using the large crawler crane by adopting the traditional method, the installation of the section beam is divided into two working points of a merging section (double-layer) and a separating section, the middle of the section beam is blocked by a steel beam, the section beam is divided into left and right frames, the large crawler crane is required to enter at least 4 times because of the incapability of continuous operation in time, each entering is budgeted according to a 1 month lease period, and the related cost is arranged as follows:
to sum up, the front leg 10 is put into the sling, which saves 159.4 ten thousand yuan compared with the traditional scheme (the related materials and measure cost of the traditional scheme are not counted).
According to the construction condition of the previous project, the joint bridge girder erection machine is constructed according to the traditional method, and the whole suspension construction is completed for 10 days on average, and the main construction flow is as follows:
(1) the method comprises the steps of installing pier top blocks, carrying out cast-in-situ consolidation on pier tops, carrying out span crossing on a bridge girder erection machine, carrying out suspension splicing on segmental girders, carrying out in-vivo prestress construction, carrying out wet joint pouring, carrying out maintenance with equal strength, carrying out unloading on the bridge girder erection machine, carrying out span crossing on the bridge girder erection machine to the next station.
The front supporting leg 10 is used for hanging the front guide beam 20, the link of installing pier top blocks in advance is omitted, the time of waiting for pouring and maintaining wet joints is not needed, the front guide beam can directly pass through the next station, and the average working efficiency can reach 7 days/span and can reach 6 days/span at most. The construction flow is as follows:
(1) the bridge girder erection machine spans, the section girder suspension splicing, the in-vivo prestress (simultaneous installation of temporary supports), the unloading of the bridge girder erection machine, the bridge girder erection machine unloading, and the bridge girder erection machine spans to the next station
In actual use, after the front hanging support leg 10 is applied to the joint bridge girder erection machine, the bridge girder erection machine is firstly installed by utilizing the existing bridge deck, then the pier top block is not required to be installed after crossing, and the construction work efficiency is obviously improved.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description.
Claims (8)
1. A front sling leg comprising:
an upper cross beam;
the support legs are arranged on the upper cross beam at intervals, each support leg comprises a telescopic upright post and a portal frame, one end of each telescopic upright post is slidably arranged on the upper cross beam so as to adjust the distance between the two groups of support legs, and the portal frame is detachably connected with the other end of each telescopic upright post; a kind of electronic device with high-pressure air-conditioning system
The support legs are detachably connected with the door frame;
when the front landing leg of the crane is supported on the pier top, the portal frame is connected with the telescopic upright post and the supporting leg; when the front landing leg of the crane is supported on the bridge deck, the portal frame is dismantled to connect the support legs with the telescopic upright posts;
the landing leg further comprises a swing frame, the swing frame is slidably arranged on the upper cross beam, and one end of the telescopic upright post is connected with the swing frame;
the swing frame is provided with a main pin shaft and two auxiliary pin shafts, the two auxiliary pin shafts are symmetrically arranged relative to the main pin shaft, the main pin shaft and the auxiliary pin shafts are connected with the telescopic upright post, the main pin shaft is in a tight fit state, the auxiliary pin shafts are in a floating state, and when the telescopic upright post inclines relative to the swing frame, the auxiliary pin shafts are stressed to prevent the telescopic upright post from inclining.
2. The front sling leg as defined in claim 1 further comprising a pressure plate mounted to the upper cross member, the pressure plate being adapted to be connected to a guide beam of a bridge girder erection machine.
3. The front sling leg as defined in claim 1 wherein the rocker is slidably mounted to the upper cross member by a change gear mechanism, the change gear mechanism being anchored to the upper cross member by a bolt.
4. The front crane leg according to claim 1, wherein the telescopic upright comprises a telescopic joint and a driving member, the telescopic joint is connected with the swing frame, the portal is detachably connected with the telescopic joint, and the driving member is used for driving the telescopic joint to stretch.
5. The front hanging leg according to claim 4, wherein the telescopic joint comprises an outer telescopic sleeve, an inner telescopic rod and a bolt, the outer telescopic sleeve is connected with the swing frame, the inner telescopic rod is movably inserted into the outer telescopic sleeve, the door frame is detachably connected with the inner telescopic rod, the outer telescopic sleeve is provided with a first jack, the inner telescopic rod is provided with a second jack, and the bolt is sequentially inserted into the first jack and the second jack to lock the telescopic joint.
6. The front hanging leg according to claim 1, wherein the supporting leg comprises a connecting seat, an adjusting screw and a spherical seat, the connecting seat is detachably installed on the portal, one end of the adjusting screw is screwed into the connecting seat, and the other end of the adjusting screw is connected with the spherical seat.
7. The front sling leg as defined in claim 6 wherein said spherical seat is provided with an arcuate projection, said adjustment screw end face being provided with a recess cooperating with said arcuate projection, said arcuate projection being inserted into said recess and locked by a screw.
8. A pitch bridge girder erection machine, comprising:
a front sling leg as defined in any one of claims 1 to 7.
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| CN202111139766.4A CN113802462B (en) | 2021-09-28 | 2021-09-28 | Joint bridging machine and front lifting leg thereof |
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| CN202111139766.4A CN113802462B (en) | 2021-09-28 | 2021-09-28 | Joint bridging machine and front lifting leg thereof |
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| CN206941397U (en) * | 2017-02-21 | 2018-01-30 | 郑州市华中建机有限公司 | Splice Bridge Erector in HZP500 single-beams section |
| CN113136810A (en) * | 2021-05-26 | 2021-07-20 | 中交第二航务工程局有限公司 | Bridge girder erection machine for integral erection construction of superstructure of long-span bridge and construction method |
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| JP2768283B2 (en) * | 1994-11-18 | 1998-06-25 | 鹿島建設株式会社 | Bridge construction method |
| CN104631335B (en) * | 2015-02-05 | 2016-06-29 | 郑州新大方重工科技有限公司 | Large-tonnage Bridge Erector and construction method thereof |
| CN104805773B (en) * | 2015-05-15 | 2016-06-29 | 武汉通联路桥机械技术有限公司 | The Segmental assembling bridge-erecting machine of little curved bridge of constructing |
| CN206916628U (en) * | 2017-06-30 | 2018-01-23 | 中交第二航务工程局有限公司 | A kind of Bridge Erector for prefabricated assembled bridge rapid construction |
| CN208792174U (en) * | 2018-07-08 | 2019-04-26 | 中铁十一局集团汉江重工有限公司 | A kind of Bridge Erector |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206941397U (en) * | 2017-02-21 | 2018-01-30 | 郑州市华中建机有限公司 | Splice Bridge Erector in HZP500 single-beams section |
| CN113136810A (en) * | 2021-05-26 | 2021-07-20 | 中交第二航务工程局有限公司 | Bridge girder erection machine for integral erection construction of superstructure of long-span bridge and construction method |
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