CN113802462A - Section-splicing bridge girder erection machine and front supporting leg for hoisting - Google Patents
Section-splicing bridge girder erection machine and front supporting leg for hoisting Download PDFInfo
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- CN113802462A CN113802462A CN202111139766.4A CN202111139766A CN113802462A CN 113802462 A CN113802462 A CN 113802462A CN 202111139766 A CN202111139766 A CN 202111139766A CN 113802462 A CN113802462 A CN 113802462A
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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
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Abstract
The invention discloses a front supporting leg for hoisting, which comprises an upper cross beam, supporting legs and supporting legs. Two sets of landing legs intervals are installed on the entablature, 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 support legs of the hoisting crane are supported on the pier tops, the portal frame is connected with the telescopic upright posts and the support legs; when the front supporting legs of the hoisting machine are supported on the bridge floor, the portal frame is detached to connect the supporting legs with the telescopic upright posts. The invention also discloses a section splicing bridge girder erection machine which comprises the hoisting front supporting leg. The section-splicing bridge girder erection machine and the front hoisting support leg thereof solve the problem of difficult support of the traditional bridge girder erection machine on the narrow pier top, can comprehensively realize front guide beam suspension construction of the bridge girder erection machine under different working conditions, obviously improve the construction efficiency and obviously improve the economic benefit.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a section splicing bridge girder erection machine and a front lifting support leg thereof.
Background
When the traditional 'full-suspension' or 'T-structure' process construction is carried out by the segment-splicing bridge girder erection machine, a segment (commonly called '0 # block' or 'pier top block') at the top of a pier body is generally installed firstly, is solidified with cast-in-place concrete at the top of a pier column and then is used for a supporting leg standing position in the bridge girder erection machine, and then segment girder splicing construction is started.
However, the installation sequence of some existing bridge section beams is slightly different, the intermediate section is firstly erected, a simple beam state is formed after prestress construction, then a temporary support is installed for supporting, the bridge girder erection machine is longitudinally moved to the next span after being unloaded, the pier top section is installed after the second span simple beam is formed, and finally wet joint construction (wet joints are located at the pier top position) is completed, namely the erection process of 'simply supporting first and then continuously'.
However, the width of the support leg in the bridge girder erection machine in the longitudinal bridge direction is 3.2m, the width of the pier top block installation area is only 1.4m, the requirement of the stand position of the support leg in the bridge girder erection machine cannot be met, then the guide beam between the two support legs cannot be utilized for suspension construction, and the design and configuration of the traditional bridge girder erection machine cannot meet the construction requirement.
Disclosure of Invention
On the basis, the section splicing bridge girder erection machine and the front suspension support leg thereof are needed to solve the problem that the middle support leg of the traditional bridge girder erection machine cannot stand on the pier top block and cannot be suspended by the guide beam between the two middle support legs.
A front leg for a sling, comprising:
an upper cross beam;
the two groups of supporting legs are arranged on the upper cross beam at intervals, each supporting 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 supporting legs, and the portal frame is detachably connected with the other end of each telescopic upright post; and
the support legs are detachably connected with the portal frame;
when the front support leg of the hoisting machine is supported on the pier top, the gantry is connected with the telescopic upright post and the support leg; when the front support leg of the hoisting machine is supported on the bridge floor, the portal frame is detached to connect the support leg with the telescopic upright post.
In one embodiment, the bridge girder erection machine further comprises a pressing plate, wherein the pressing plate is installed on the upper cross beam and is used for being connected with a guide beam of the bridge girder erection machine.
In one embodiment, the support leg further comprises a swing frame, the swing frame is slidably mounted on the upper cross beam, and one end of the telescopic upright post is connected with the swing frame.
In one embodiment, a main pin shaft and two auxiliary pin shafts are mounted on the swing frame, the two auxiliary pin shafts are symmetrically arranged around the main pin shaft, the main pin shaft and the auxiliary pin shafts are connected with the telescopic upright columns, the main pin shaft is in a tight fit state, the auxiliary pin shafts are in a floating state, and when the telescopic upright columns incline relative to the swing frame, the auxiliary pin shafts are stressed to prevent the telescopic upright columns from inclining.
In one embodiment, the swing frame is slidably mounted on the upper cross beam through a gear train mechanism, and the gear train mechanism is fixedly anchored on the upper cross beam through bolts.
In one embodiment, the telescopic upright column comprises a telescopic joint and a driving piece, the telescopic joint is connected with the swing frame, the door frame is detachably connected with the telescopic joint, and the driving piece is used for driving the telescopic joint to stretch.
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 gantry 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 rod and a spherical seat, the connecting seat is detachably mounted on the gantry, one end of the adjusting screw rod is screwed in the connecting seat, and the other end of the adjusting screw rod is connected with the spherical seat.
In one embodiment, the spherical seat is provided with an arc-shaped protrusion, the end surface 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 section-splicing bridge girder erection machine comprises:
the front support leg of the sling according to any one of the preceding claims.
Above-mentioned bridge girder erection machine is pieced together to festival and landing leg before the hoist weight thereof, the landing leg can support on the mound top before the hoist weight, has solved the difficult problem of support of traditional bridge girder erection machine on narrow mound top, still can support the anchor at the bridge floor simultaneously, can realize bridge girder erection machine front guide beam suspension construction under different operating modes comprehensively. The front guide beam suspension construction is carried out by adopting the front hoisting support leg, the link of installing a pier top block in advance is omitted, the wet joint pouring and maintenance time does not need to be waited, the construction efficiency can be directly striden to the next station, and the construction 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, which are required to be used in the embodiments, will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to actual scale.
FIG. 1 is a schematic view of a bridge erected by a section splicing bridge erecting machine according to an embodiment;
FIG. 2 is a schematic view of the front leg of the hoist 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 view of the connection between the swing frame and the telescopic column in FIG. 3;
FIG. 6 is an enlarged view of a portion of FIG. 3 at B;
FIG. 7 is a schematic view of the structure of the supporting foot in FIG. 2;
FIG. 8 is a schematic view of the front leg of the hoist of FIG. 1 supported on a deck;
FIG. 9 is a schematic illustration of the front leg of the sling of FIG. 2 with a ladder platform supported atop the pier;
figure 10 is a schematic illustration of the front leg of the sling of figure 2 when supported on a deck of a bridge with a ladder platform.
Reference numerals:
10-sling front leg, 110-upper beam, 112-boss, 120-leg, 121-telescopic column, 122-gantry, 123-telescopic joint, 1231-outer telescopic sleeve, 1232-inner telescopic rod, 1233-inserted rod, 1234-first insertion hole, 1235-second insertion hole, 124-driving piece, 125-first mounting plate, 126-second mounting plate, 127-connecting rod, 130-foot, 131-connecting seat, 132-adjusting screw, 133-spherical seat, 134-baffle, 135-arc bulge, 140-pressing plate, 150-swing frame, 152-main pin shaft, 154-auxiliary pin shaft, 160-hanging wheel mechanism, 162-connecting frame, 164-roller, 170-anchoring piece, 182-climbing ladder, 184-walking ladder, 20 guide beams, 30 middle support legs, 40 rear support legs, 50 hoisting crown blocks and 60 travelling cranes.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It will be understood that when an element is referred to as being "secured 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 as used herein are for illustrative purposes only and do not represent the only embodiments.
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 in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1, an exemplary segmental bridge girder erection machine includes front legs 10 for hoisting. In one embodiment, the segmental bridge erection machine further comprises a guide beam 20, a middle leg 30, a rear leg 40, a hoisting crown block 50 and a traveling crane 60, wherein the hoisting front leg 10, the middle leg 30 and the rear leg 40 are sequentially arranged on the guide beam 20, and the middle leg 30 is positioned between the hoisting front leg 10 and the rear leg 40. The hoisting crown block 50 and the traveling crane 60 are arranged at the top of the guide beam 20, the hoisting crown block 50 is responsible for hoisting the segmental beam, the rated hoisting capacity is 250t, and the traveling crane 60 is responsible for hoisting a lifting appliance, materials and the like, and the hoisting capacity is 20 t.
Referring to fig. 2 and 3, in one embodiment, the front leg 10 of the hoist includes an upper beam 110, a leg 120 and a foot 130. The upper cross member 110 is mounted to the bottom of the front end of the guide beam 20. In one embodiment, the front leg 10 further includes a pressing plate 140, 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 64 studs of M30 spaced from the end 4.015M, with a stud pretension torque of 500 n.m.
The landing legs 120 are installed on the upper cross beam 110, two groups of landing legs 120 are arranged, and the two groups of landing legs 120 are arranged at intervals. The legs 120 include telescopic columns 121 and a gantry 122, and one end of each telescopic column 121 is slidably mounted on the upper beam 110 to adjust the distance between the two sets of 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 can be slidably mounted on the upper beam 110.
Referring to fig. 4, in addition to the above embodiment, the swing frame 150 is slidably mounted on the upper beam 110 through the two sets of the gear change mechanisms 160, and the two sets of the gear change mechanisms 160 are respectively located at two opposite sides of the upper beam 110. The change gear mechanism 160 slides on the upper cross beam 110, and after the distance between the two sets of support legs 120 is adjusted, the change gear mechanism is positioned and anchored on the upper cross beam 110 through bolts.
In one embodiment, the change gear mechanism 160 includes a connecting frame 162 and two rollers 164, the connecting frame 162 is connected to the swing frame 150, the rollers 164 are rotatably mounted on the connecting frame 162, the upper beam 110 has two bosses 112, the two bosses 112 are respectively located on two opposite sides of the upper beam 110, and the rollers 164 of the two change gear mechanisms 160 are respectively arranged on the two bosses 112 in a rolling manner, so as to prevent the change gear mechanism 160 from separating from the upper beam 110. Bolts can anchor the connecting frame 162 to the upper cross beam 110, so that the change gear mechanism 160 is positioned and anchored on the upper cross beam 110.
Referring to fig. 5, in one embodiment, the swing frame 150 is provided with a main pin 152 and two auxiliary pins 154, 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 both connected with the telescopic upright column 121, so that the connection between the telescopic upright column 121 and the swing frame 150 is realized. The kingpin 152 is permanently in a tight fit, while the kingpin 154 is normally in a floating position and is inoperative.
Specifically, the telescopic column 121 is provided with a pin hole, the main pin 152 and the auxiliary pin 154 are inserted into the pin hole, the main pin 152 has the same diameter as the pin inserted through the main pin 152, so that the main pin 152 is in a tight fit state, and the auxiliary pin 154 has a diameter smaller than the pin hole inserted through the auxiliary pin 154, so that the auxiliary pin 154 is in a floating state. The telescopic upright 121 can rotate relative to the swing frame 150, and can adapt to the inclination of the guide beam 20, and the support leg 120 automatically keeps a vertical state.
Specifically, when the support leg 120 is abnormally inclined, the telescopic upright column 121 is inclined relative to the swing frame 150, and the auxiliary pin shaft 154 is in contact with the side wall of the pin hole to bear force, so that the telescopic upright column 121 is prevented from being inclined relative to the swing frame 150, and the support safety of the support leg 120 is guaranteed. Specifically, in the present embodiment, the diameter of the main pin 152 is 150mm, and the diameter of the auxiliary pin 154 is 70 mm.
Referring to fig. 2 again, the telescopic columns 121 can telescopically adjust the length of the legs 120 to adapt to the gradient of the bridge deck. In one embodiment, the telescopic column 121 includes a telescopic joint 123 and a driving member 124, the telescopic joint 123 is connected to the swing frame 150, and the driving member 124 is used for driving the telescopic joint 123 to extend and retract. In one embodiment, each telescopic column 121 has two telescopic joints 123, the two telescopic joints 123 are spaced apart, and the driving member 124 is located between the two telescopic joints 123.
Referring also to fig. 6, in one embodiment, the telescopic joint 123 includes an outer telescopic sleeve 1231, an inner telescopic rod 1232 and an insertion rod 1233. The outer telescoping sleeve 1231 is connected to the swing frame 150. Specifically, the outer telescoping sleeve 1231 is connected to the main pin 152 and the auxiliary pin 154, so that the outer telescoping sleeve 1231 is connected to the swing frame 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 the movement of the inner telescopic rod 1232 relative to the outer telescopic sleeve 1231. The outer telescopic sleeve 1231 is provided with a plurality of first jacks 1234 at intervals along the axial direction thereof, the inner telescopic rod 1232 is provided with a plurality of second jacks 1235 at intervals along the axial direction thereof, and the inserted rods 1233 are sequentially inserted into the first jacks 1234 and the second jacks 1235 so as to lock the telescopic joint 123.
On the basis of the above embodiment, further, the number of the second insertion holes 1235 is 6, and the distance between the second insertion holes 1235 is 200mm, so that the total adjustment height of the telescopic joint 123 is 200mm × 6 — 1200mm, the number of the first insertion holes 1234 is 4, and the distance between the first insertion holes 1234 is 300mm, so that the adjustment precision is reduced from 200mm to 100mm, and the accurate adjustment is more convenient. The first insertion hole 1234 is in a shape of a key hole with a small upper part and a large lower part, and a sleeve is arranged in the second insertion hole 1235, so that the hole aligning operation of the outer telescopic sleeve 1231 and the inner telescopic rod 1232 is greatly facilitated by the two measures.
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 to the outer telescopic sleeve 1231, a piston rod of the driving member 124 is connected to the inner telescopic rod 1232, and the expansion and contraction of the driving member 124 can drive the inner telescopic rod 1232 to move relative to the outer telescopic sleeve 1231, so as to realize the expansion and contraction of the driving telescopic joint 123.
In one embodiment, the outer telescoping sleeves 1231 of the two telescoping sections 123 are integrally connected by the first mounting plate 125, the first mounting plate 125 is connected to the swing frame 150, and the inner telescoping rods 1232 of the two telescoping sections 123 are integrally connected by the second mounting plate 126. The cylinder of the actuator 124 is mounted on a first mounting plate 125 and the piston rod of the actuator 124 is connected to a second mounting plate 126.
It is understood that in other embodiments, the driving member 124 may have other configurations as long as the inner telescopic rod 1232 can be driven to extend or retract relative to the outer telescopic sleeve 1231. For example, the driver 124 may also be a pneumatic cylinder, or an electric push rod.
Referring to fig. 8, the door frame 122 is detachably connected to the other end of the telescopic column 121, and the leg 130 is detachably connected to the door frame 122. Wherein, when the front support leg 10 of the hoist is supported on the pier top, the gantry 122 connects the telescopic upright 121 and the support foot 130 to complete the erection of the segment beam under normal conditions. Because the segmental beam is connected with the steel beam, a working condition of erecting a folding section exists, the working condition comprises that the bridge erecting machine longitudinally moves on the bridge floor after the bridge is completely penetrated, the landing legs 10 before hoisting are required to be supported on the bridge floor, when the landing legs 10 before hoisting are supported on the bridge floor, the gantry 122 is partially disassembled, the distance between the landing legs 120 is adjusted to be matched with the position of a segmental beam web, and the supporting legs 130 are connected with the telescopic upright columns 121.
In one embodiment, the door frame 122 is connected to the second mounting plate 126 through a connecting bolt, so that the door frame 122 is detachably connected to the telescopic upright 121, the supporting leg 130 is detachably connected to the door frame 122 through a connecting bolt, and the supporting leg 130 is detachably connected to the telescopic upright 121 through a connecting bolt. The door frames 122 are provided with connecting rods 127, and the connecting rods 127 of the two door frames 122 are connected with each other to maintain the two sets of legs 120 as a whole.
The front leg 10 of the sling must be anchored to the pier top while supported on the pier top. In one embodiment, front leg 10 further includes an anchor 170, one end of anchor 170 is fixed to gantry 122, and the other end of anchor 170 is anchored to the pier top. Specifically, the anchor member 170 may be a bolt or an anchor cable, and one end of the bolt member 170 is fixed to the connecting rod 127. The two opposite sides of the portal 122 are provided with anchoring parts 170, and the two portals 122 connect the portal 122 and the pier top embedded part into a whole through 4 finish-rolled threaded steel bars with the diameter of 40 mm.
Referring to fig. 7, in one embodiment, the supporting leg 130 includes a connecting seat 131, an adjusting screw 132 and a spherical seat 133, the connecting seat 131 is detachably mounted on the gantry 122, one end of the adjusting screw 132 is screwed into the connecting seat 131, and the other end of the adjusting screw 132 is connected to the spherical seat 133. The adjusting screw 132 adopts a trapezoidal thread connection pair, so that the accurate fine adjustment of the whole height of the front supporting leg 10 can be realized.
On the basis of the above embodiment, the baffle 134 is installed to the terminal surface that adjusting screw 132 is located connecting seat 131, and baffle 134 can prevent that adjusting screw 132 from unscrewing the overlength, leads to the number of turns of closing soon to reduce, influences equipment safety. 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 bulge 135 arranged on the spherical seat 133 can meet the requirement of uneven support, and the maximum adaptive gradient is 2.5%.
Referring to fig. 9 and 10, in one embodiment, the front leg 10 further comprises a ladder platform including a crawling ladder 182 and a walking ladder 184, wherein the crawling ladder 182 and the walking ladder 184 are both connected to the telescopic mast 121. Specifically, the creeper ladder 182 and the walking ladder 184 are coupled to the second mounting plate 126.
When the front support leg 10 of the hoisting weight is supported on the pier top, the front support leg 10 of the hoisting weight is in a complete assembly state, and the ladder platform mainly meets the passing requirements of constructors in three working areas, namely a bridge girder erection machine, the pier top and a bridge floor. When the supporting legs 10 are supported on the bridge floor before hoisting, the overall height is reduced, the supporting distance is changed, the crawling ladder 182 is detached, and the ladder platform in the state mainly meets the passing requirements of construction personnel in two working areas, namely a bridge girder erection machine and the bridge floor.
The section splicing bridge girder erection machine and the hoisting front supporting leg 10 solve the problem of difficult support of the traditional bridge girder erection machine on a narrow pier top, and meanwhile, the bridge girder erection machine can be supported and anchored on a bridge floor, the suspension construction of the front guide beam 20 of the bridge girder erection machine can be comprehensively realized under different working conditions, namely the section girder erection is completed between the hoisting front supporting leg 10 and the middle supporting leg 30. Compared with the traditional construction method, after the front support leg 10 of the hoisting crane is applied to the section splicing bridge girder erection machine, the economic benefit and the construction work efficiency are improved, and the construction method specifically comprises the following steps:
the cost of newly manufacturing a set of hoisting front supporting legs 10 is 95 ten thousand yuan, and the bridge girder erection machine is assisted to realize the suspension construction of the front guide beam 20. If adopt traditional scheme, need to utilize two well landing legs of bridge girder erection machine to hang the construction, be difficult to direct construction under the operating mode of narrow mound top and back installation mound kicking block. If the scheme is changed, the pier top block segments need to be installed firstly, and then the bridge girder erection machine supports on the pier top blocks to construct. The method is characterized in that cost and difficulty generated by a change scheme are not considered, a pier top block is required to be installed in advance by using a large crawler crane by adopting a traditional method, a section beam is installed and divided into 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 a left beam and a right beam, the large crawler crane needs to enter a field for at least 4 times due to the fact that continuous operation cannot be carried out in time, the lease budget of 1 month is reserved when the large crawler crane enters the field every time, and related cost is arranged as follows:
in summary, the investment of the front support leg 10 for hoisting is saved by at least 159.4 ten thousand yuan compared with the traditional scheme (the related material and measure expenses of the traditional scheme are not counted).
According to the construction condition of the previous project, the section-splicing bridge girder erection machine is constructed according to the traditional method, the full-suspension construction is completed in 10 days on average, and the main construction flow is as follows:
installing pier top blocks → pouring and concreting pier tops in situ → crossing of bridge girder erection machines → hanging and splicing of segmental beams → internal prestress construction → pouring of wet joints → maintenance of equal strength → unloading of bridge girder erection machines → crossing of bridge girder erection machines to the next station.
The front guide beam 20 is suspended and constructed by the front support legs 10 with the hoisting weights, a link of mounting a pier top block in advance is omitted, wet joint pouring and maintenance time does not need to be waited, the next station can be directly spanned, the average work efficiency can reach 7 days per span, and the maximum work efficiency can reach 6 days per span. The construction process comprises the following steps:
firstly, spanning of bridge girder erection machine → suspension assembly of segmental girder → internally prestressed (temporary support is simultaneously installed) → unloading of bridge girder erection machine → crossing of bridge girder erection machine to next station
In actual use, after the front support leg 10 of the hoisting weight is applied to the node splicing bridge girder erection machine, the bridge girder erection machine is firstly installed by utilizing the existing bridge deck, and then a pier top block is not needed to be installed when the bridge girder passes over the span, so that the construction efficiency is obviously improved.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (10)
1. A front leg for lifting a weight, comprising:
an upper cross beam;
the two groups of supporting legs are arranged on the upper cross beam at intervals, each supporting 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 supporting legs, and the portal frame is detachably connected with the other end of each telescopic upright post; and
the support legs are detachably connected with the portal frame;
when the front support leg of the hoisting machine is supported on the pier top, the gantry is connected with the telescopic upright post and the support leg; when the front support leg of the hoisting machine is supported on the bridge floor, the portal frame is detached to connect the support leg with the telescopic upright post.
2. The front leg of claim 1, further comprising a clamp plate mounted to the upper cross member, the clamp plate configured to couple to a guide beam of a bridge girder erection machine.
3. The front leg of claim 1, further comprising a swing frame slidably mounted to the upper cross member, wherein one end of the telescoping mast is connected to the swing frame.
4. The front crane weight support leg as claimed in claim 3, wherein the swing frame is provided with a main pin shaft and two auxiliary pin shafts, the two auxiliary pin shafts are symmetrically arranged about 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.
5. The front leg of claim 3, wherein the swing frame is slidably mounted to the upper beam via a change gear mechanism that is anchored in place by bolts to the upper beam.
6. The front lifting leg of claim 3, wherein the telescopic column comprises a telescopic joint and a driving member, the telescopic joint is connected with the swing frame, the gantry is detachably connected with the telescopic joint, and the driving member is used for driving the telescopic joint to stretch.
7. The front support leg for hoisting according to claim 6, 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 gantry 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.
8. The front support leg for hoisting according to claim 1, wherein the support leg comprises a connecting seat, an adjusting screw and a spherical seat, the connecting seat is detachably mounted on the gantry, 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.
9. Front leg for lifting loads according to claim 8, characterized in that the spherical seat is provided with an arc-shaped projection, the end surface of the adjusting screw is provided with a groove cooperating with the arc-shaped projection, and the arc-shaped projection is inserted into the groove and locked by a screw.
10. The utility model provides a section amalgamation bridging machine which characterized in that includes:
front leg of a sling according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111139766.4A CN113802462B (en) | 2021-09-28 | 2021-09-28 | Joint bridging machine and front lifting leg thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111139766.4A CN113802462B (en) | 2021-09-28 | 2021-09-28 | Joint bridging machine and front lifting leg thereof |
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| Publication Number | Publication Date |
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| CN113802462A true CN113802462A (en) | 2021-12-17 |
| CN113802462B CN113802462B (en) | 2023-04-25 |
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Cited By (1)
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| CN114855623A (en) * | 2022-05-13 | 2022-08-05 | 中交二航局第二工程有限公司 | Front supporting leg auxiliary standing position device and method for section-splicing bridge girder erection machine |
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| CN114855623A (en) * | 2022-05-13 | 2022-08-05 | 中交二航局第二工程有限公司 | Front supporting leg auxiliary standing position device and method for section-splicing bridge girder erection machine |
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| CN113802462B (en) | 2023-04-25 |
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