CN112195785A - Rotatable ultra-low-altitude bridge construction method for underpass existing bridge small-radius curve bridge - Google Patents
Rotatable ultra-low-altitude bridge construction method for underpass existing bridge small-radius curve bridge Download PDFInfo
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- CN112195785A CN112195785A CN202010988761.8A CN202010988761A CN112195785A CN 112195785 A CN112195785 A CN 112195785A CN 202010988761 A CN202010988761 A CN 202010988761A CN 112195785 A CN112195785 A CN 112195785A
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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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Abstract
The invention relates to a rotatable ultra-low-altitude bridge construction method for a small-radius curve bridge passing through an existing bridge, which comprises the following steps: (1) adjusting a rotating flange: the upper connecting hole of the rotary flange connected up and down adopts an arc slotted hole, the lower connecting hole adopts a circular hole, and the arc slotted hole is connected with the circular hole through a bolt; (2) preparing an ultra-low altitude state: the supporting height of the rear part of the main truss is reduced, the structure of the support leg in the main truss is changed, and the supporting height of the front support leg of the main truss is reduced; (3) angle adjustment: and (3) loosening the connecting bolts of the rotating flanges, adjusting the self angle of the main truss under the driving of the transverse movement of the front supporting legs, adaptively changing the positions of all the supports of the main truss during angle adjustment, and simultaneously moving the positions of the main truss back and forth to adjust until all the supporting parts of the main truss are in place and the height of the main truss is reduced to the required height. The adjustment is easy and simple to handle, and at the bridge girder erection machine steering in-process, compare in traditional flange structure and can effectively reduce bridge girder erection machine unstability risk, safe secure.
Description
Technical Field
The invention relates to a construction method of a bridge, in particular to a rotatable ultra-low-altitude bridge construction method for a small-radius curve bridge which penetrates through an existing bridge downwards.
Background
In a project junction of a mountain expressway, the minimum curve radius R =130 m of a ramp bridge, a main line bridge passes through the ramp bridge, the minimum clearance is 5.9 m, the main line bridge is used as a beam transporting channel and needs to be erected in advance, otherwise, ramp beam plates cannot be transported to a site for installation. The project belongs to the mountain expressway engineering, the lower part structure is a hollow thin-wall pier, the maximum pier height is 48.8 meters, the field topography is steep and dangerous, and the project is difficult to erect by adopting a crane. If the bridge erecting machine is adopted for erecting, the angle of the placing position of the beam plate is usually achieved by continuously adjusting the angle of the bridge erecting machine. The rotatory flange of bridge crane that has now includes top rotary flange and lower rotary flange, top and bottom rotary flange is fixed through a plurality of bolts, all bolts need be lifted off during the rotation, can realize the rotation of top rotary flange, this has not only increased the labour, there is certain risk still, if all lift off top and bottom rotary flange bolt at rotatory in-process, the upper and lower ring flange is in the detached state, overturn taking place easily at bridge crane angular adjustment in-process, and the operating personnel when fastening bolt, if the bolt is omitted to screw up, also overturn easily when the bridge crane is moving, cause serious consequence.
Disclosure of Invention
The invention solves the defects that the existing bridge girder erection machine is easy to overturn in the process of continuously adjusting the self angle, and all bolts of a rotary flange need to be disassembled in the adjusting process, so that an upper rotary flange and a lower rotary flange are in a separated state, and the safety is poor.
The specific technical scheme of the invention is as follows: a rotatable ultra-low-altitude bridge construction method for a small-radius curve bridge passing through an existing bridge comprises the following steps:
(1) adjusting a rotating flange: the upper connecting hole of the rotary flange connected up and down adopts an arc slotted hole, the lower connecting hole adopts a circular hole, and the arc slotted hole is connected with the circular hole through a bolt;
(2) preparing an ultra-low altitude state: the supporting height of the rear part of the main truss is reduced, the structure of the support leg in the main truss is changed, and the supporting height of the front support leg of the main truss is reduced, so that the overall height of the main truss is reduced;
(3) angle adjustment: loosening connecting bolts of the rotary flange, adjusting the self angle of the main truss under the driving of the transverse movement of the front supporting legs, adaptively changing the positions of all supports of the main truss during angle adjustment, and simultaneously moving the positions of the main truss back and forth to adjust until all supporting parts of the main truss are in place and the height of the main truss is reduced to the required height;
(4) and (4) performing cross-hole operation.
The mode that it is fixed to adopt the round hole to connect with spiral changes into circular arc slotted hole and circular port cooperation with bolted connection fixed mode with former rotatory flange for during the adjustment rotatory flange, need not all dismantle the bolt of connecting usefulness, only need loosen connecting bolt, can adjust rotatory flange, thereby the angle of adjustment primary truss, in angle of adjustment, rotatory flange can not separate, still has the spiral to play the effect of connecting, thereby it guarantees the operation safety to rotate angle of adjustment. After the angle adjustment, sufficient screwed connection is in addition on the rotating flange, and omission can not appear when refastening again, also can not appear the phenomenon of losing the bolt behind the dismantlement bolt. In order to realize the ultra-low altitude state, the overall height of the main truss is reduced, the supporting heights of all parts of the main truss are changed one by one, and the supporting height of the rear part of the main truss is reduced, a mode of reducing the supporting height of the rear supporting leg of the main truss can be adopted, if the supporting height is further reduced, other devices with low supporting heights are considered to replace the supporting, and because the supporting position and the supporting weight of the middle supporting leg are more important, the structure of the middle supporting leg of the main truss is considered to be changed, for example, a middle supporting leg beam and a middle supporting leg reverse roller are disassembled and respectively used, the function of pushing the main truss by the middle supporting leg reverse roller is kept, meanwhile, the enough supporting force of the main truss of the middle supporting leg beam is kept, and because the front supporting leg has the requirement. The ramp bridge has a curve radius, so that the angle of a main truss needs to be adjusted when the bridge is bridged, after a rotating flange is loosened, a front supporting leg moves transversely, the main truss deflects, in the deflection process, each supporting component needs to be moved adaptively, the supporting stability of each supporting component is ensured, and finally the main truss needs to move forwards when the angle of the main truss is adjusted. The adjustment operation is simple and convenient, and compared with the traditional flange structure, the instability risk of the bridge girder erection machine can be effectively reduced in the steering process of the bridge girder erection machine, and the safety is guaranteed; the construction efficiency can be improved, the construction cost is reduced, the building time of a crane girder erection platform is saved, and the time spent on angle adjustment is obviously reduced during cross-hole operation of a bridge girder erection machine, so that the construction period is shortened; compared with a crane girder erection machine, the girder erection platform is not required to be constructed, the measure cost is saved, the labor cost and the dead time of installation equipment are reduced, the installation time of the precast beam is shortened, and the construction cost is reduced.
Preferably, the rotary flange adopts an upper, middle and lower three-section structure, wherein the connecting flange part of the upper rotary flange is a round hole, the upper connecting flange part of the middle rotary flange is a round hole, the lower connecting flange part of the middle rotary flange is an arc slotted hole, and the upper connecting flange part of the lower rotary flange is an arc slotted hole. The rotary flange is divided into an upper, middle and lower three-section splicing structure, and is mainly used for connecting the upper rotary flange with the main truss in order to facilitate rotation, so that the upper rotary flange and the middle rotary flange are connected in a circular hole mode, and after the connection structure with the main truss is ensured, a proper middle rotary flange can be selected, particularly the selection on the height is realized; the lower connecting flange part of the middle rotating flange adopts an arc groove, and the upper connecting flange part of the lower rotating flange adopts an arc groove hole, so that the middle rotating flange and the lower rotating flange can rotate.
Preferably, the middle support leg structure is changed by splitting the middle support leg counter-roller and the middle support leg cross beam, the middle support leg counter-roller and the middle support leg cross beam are respectively and independently used, and the supporting positions of the middle support leg counter-roller and the middle support leg cross beam on the main truss are changed along with the reduction of the height of the main truss. The supporting height can be reduced by using the split middle supporting leg integral structure independently, the supporting positions of the middle supporting leg counter-roller and the middle supporting leg cross beam are changed, meanwhile, more choices are provided for the supporting positions of the lower ends of the middle supporting leg counter-roller and the middle supporting leg cross beam, and the reduction of the integral height of the main truss is promoted.
Preferably, after the middle support leg cross beam and the middle support leg counter-roller are detached, the middle support leg heightening seat is additionally arranged on the upper portion of the middle support leg cross beam, and the middle support leg cross beam supports the main truss through the middle support leg heightening seat. In order to ensure the supporting effect of the middle supporting leg cross beam, the middle supporting leg heightening seat is additionally arranged on the upper part of the middle supporting leg cross beam.
Preferably, the step of lowering the supporting height of the rear part of the main truss is realized by replacing the rear supporting leg with a jack, and the jack supports the rear part of the main truss; the jack and the front support leg support the main truss and reduce the overall height of the main truss, the middle support leg cross beam is placed behind the front support leg, and the middle support leg counter-roller falls to the ground and supports the main truss.
Further preferably, the foremost end of the main truss is provided with an auxiliary supporting leg support, and the angle adjustment comprises the following steps: a. loosening the connecting bolts of the rotary flange, starting the front support leg cart to transversely move, starting the reverse roller driving wheel set when the front support leg cart interferes with the front support leg transverse moving track, driving the main truss to backwards move, and adjusting the front support leg transverse moving track to enable the front support leg cart to have a transverse moving space again when the auxiliary support legs stand at the bridge pier; b. after the front support leg transverse moving track is adjusted, the middle support leg reverse roller set is started to move forwards and is stressed when falling to the ground, then the middle support leg cart is started to move transversely, and when the middle support leg cart interferes with the transverse moving track, a jack at the rear part of the rear main truss is supported and stabilized, and then the middle support leg transverse moving track is adjusted; and (c) repeatedly adjusting according to the mode of the step (a) and the step (b) until the angle is adjusted in place, and enabling the auxiliary supporting leg to be located at the front pier.
More preferably, the traverse limit distance of the front leg cart is about 1m, and the traverse limit distance of the middle leg cart is about 1 m.
Preferably, after the angle of the main truss is adjusted in place, the middle supporting leg cross beam is supported in a floor mode, the crane trolley moves to the middle supporting leg cross beam, and the front supporting leg is moved to the front pier to be supported in the floor mode.
Preferably, when the height of the main truss needs to be further reduced, the middle support leg counter-roller is started to move the main truss forwards, the middle support leg cross beam is removed after the main truss is moved to the place, the front part of the main truss is supported by the front support leg under the assistance of the jack, and the middle rear part of the main truss is supported by the middle support leg counter-roller in a floor mode.
Further preferably, the upper connecting hole of the rotating flange adopts a mode that an arc slotted hole and a circular hole are spaced, and the arc slotted hole is arranged in central symmetry on the circumference.
The invention has the beneficial effects that: 1. the original rotary flange is changed into a mode that the circular hole is connected and fixed by the spiral into a mode that the circular arc slotted hole is matched with the circular hole and is connected and fixed by the bolt, so that when the rotary flange is adjusted, the bolt for connection is not required to be completely disassembled, and the rotary flange can be adjusted only by loosening the connecting bolt, thereby adjusting the angle of the main truss, and when the angle is adjusted, the rotary flange can not be separated, and the spiral connection effect is also realized, so that the operation safety is ensured when the angle is adjusted by rotating;
2. the adjustment operation is simple and convenient, and compared with the traditional flange structure, the instability risk of the bridge girder erection machine can be effectively reduced in the steering process of the bridge girder erection machine, and the safety is guaranteed;
3. the construction efficiency can be improved, the construction cost is reduced, the building time of a crane girder erection platform is saved, and the time spent on angle adjustment is obviously reduced during cross-hole operation of a bridge girder erection machine, so that the construction period is shortened;
4. compared with a crane girder erection machine, the girder erection platform is not required to be constructed, the measure cost is saved, the labor cost and the dead time of installation equipment are reduced, the installation time of the precast beam is shortened, and the construction cost is reduced.
Detailed Description
The invention is further described below by means of specific examples.
Example (b):
a rotatable ultra-low-altitude bridge construction method for a small-radius curve bridge passing through an existing bridge comprises the following steps:
(1) adjusting a rotating flange: the rotary flange adopts an upper, middle and lower three-section structure, wherein the connecting flange part of the upper rotary flange is a round hole, the upper connecting flange part of the middle rotary flange is a round hole, the lower connecting flange part of the middle rotary flange is an arc slotted hole, and the upper connecting flange part of the lower rotary flange is an arc slotted hole; the three sections of structures are mutually overlapped, a round hole of the lower connecting flange part of the upper rotating flange and a round hole of the upper connecting flange part of the middle rotating flange are coaxially corresponding and are fixedly connected by bolts, and an arc slotted hole of the lower connecting flange part of the middle rotating flange and an arc slotted hole of the upper connecting flange part of the lower rotating flange are corresponding and are connected by bolts;
(2) preparing an ultra-low altitude state: detaching a rear supporting leg of the main truss, replacing the rear supporting leg with a jack to reduce the supporting height, detaching a middle supporting leg reverse roller and a middle supporting leg cross beam to change the structure of the middle supporting leg of the main truss, wherein the middle supporting leg reverse roller and the middle supporting leg cross beam are respectively and independently used, the supporting positions of the middle supporting leg reverse roller and the middle supporting leg cross beam on the main truss are changed along with the reduction of the height of the main truss, after the middle supporting leg cross beam and the middle supporting leg reverse roller are detached, a middle supporting leg heightening seat is additionally arranged at the upper part of the middle supporting leg cross beam, and the middle supporting leg cross beam supports the main truss; the jack and the front support leg support the main truss and reduce the overall height of the main truss, the middle support leg cross beam is placed behind the front support leg, and the middle support leg counter-roller falls to the ground and supports the main truss;
(3) angle adjustment: the foremost end of the main truss is provided with an auxiliary supporting leg support, and the angle adjustment comprises the following steps: a. loosening connecting bolts of a rotary flange, starting a front support leg cart to transversely move, adjusting the self angle of a main truss under the transverse movement driving of the front support leg, starting a reverse roller driving wheel set when the front support leg cart interferes with a front support leg transverse moving track, driving the main truss to backwards move, adjusting the front support leg transverse moving track after an auxiliary support leg is positioned at a pier and stably supported, and enabling the front support leg cart to have a transverse moving space again; b. after the front support leg transverse moving track is adjusted, the middle support leg reverse roller set is started to move forwards and is stressed when falling to the ground, then the middle support leg cart is started to move transversely, and when the middle support leg cart interferes with the transverse moving track, a jack at the rear part of the rear main truss is supported and stabilized, and then the middle support leg transverse moving track is adjusted; repeatedly adjusting according to the mode of the step a and the step b until all the supporting parts of the main truss are in place, the height of the main truss is reduced to the required height, adjusting the angle to be in place, and enabling the auxiliary supporting legs to stand in front of the pier; the transverse movement limit distance of the front leg cart is about 1m, and the transverse movement limit distance of the middle leg cart is about 1 m; after the angle of the main truss is adjusted in place, the middle landing leg cross beam is supported in a landing mode, the crane trolley moves onto the middle landing leg cross beam, and the front landing leg is moved to the front pier landing support; the whole height of the bridge girder erection machine is reduced to 5.287 m;
(4) and (4) performing cross-hole operation.
When the height of the main truss needs to be further reduced, the middle supporting leg counter-roller is started to move the main truss forwards, the middle supporting leg cross beam is removed after the main truss is moved in place, the front part of the main truss is supported by the front supporting leg, and the middle and rear parts of the main truss are supported by the middle supporting leg counter-roller in a floor mode under the assistance of the jack. The whole height of the bridge girder erection machine is reduced to 4.964 m.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, alterations and equivalents of the above embodiments according to the technical spirit of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (10)
1. A rotatable ultra-low-altitude bridge construction method for a small-radius curve bridge of an existing underpass bridge is characterized by comprising the following steps:
(1) adjusting a rotating flange: the upper connecting hole of the rotary flange connected up and down adopts an arc slotted hole, the lower connecting hole adopts a circular hole, and the arc slotted hole is connected with the circular hole through a bolt;
(2) preparing an ultra-low altitude state: the supporting height of the rear part of the main truss is reduced, the structure of the support leg in the main truss is changed, and the supporting height of the front support leg of the main truss is reduced, so that the overall height of the main truss is reduced;
(3) angle adjustment: loosening connecting bolts of the rotary flange, adjusting the self angle of the main truss under the driving of the transverse movement of the front supporting legs, adaptively changing the positions of all supports of the main truss during angle adjustment, and simultaneously moving the positions of the main truss back and forth to adjust until all supporting parts of the main truss are in place and the height of the main truss is reduced to the required height;
(4) and (4) performing cross-hole operation.
2. The rotatable ultra-low altitude bridging construction method of claim 1, wherein the rotary flange has a three-stage structure of upper, middle and lower, wherein the connecting flange portion of the upper rotary flange is a circular hole, the upper connecting flange portion of the middle rotary flange is a circular hole, the lower connecting flange portion of the middle rotary flange is a circular arc slot hole, and the upper connecting flange portion of the lower rotary flange is a circular arc slot hole.
3. The rotatable ultra-low-altitude bridge construction method for the existing small-radius curved bridge passing through the existing bridge is characterized in that the structure of the middle support leg is changed by adopting the structure that the middle support leg counter roller and the middle support leg cross beam are detached and are respectively and independently used, and the supporting positions of the middle support leg counter roller and the middle support leg cross beam on the main truss are changed along with the reduction of the height of the main truss.
4. The rotatable ultra-low-altitude bridge construction method for the existing small-radius curved bridge passing through the lower part of the existing bridge as claimed in claim 3, wherein after the middle leg beam and the middle leg counter-roller are disassembled, the middle leg heightening seat is additionally arranged on the upper part of the middle leg beam, and the middle leg beam supports the main truss through the middle leg heightening seat.
5. The rotatable ultra-low-altitude bridge construction method for the existing small-radius curved bridge passing through the existing bridge downwards according to claim 1, 3 or 4, wherein the supporting height of the rear part of the main truss is reduced by replacing a rear supporting leg with a jack, and the jack supports the rear part of the main truss; the jack and the front support leg support the main truss and reduce the overall height of the main truss, the middle support leg cross beam is placed behind the front support leg, and the middle support leg counter-roller falls to the ground and supports the main truss.
6. The rotatable ultra-low-altitude bridge construction method for the existing small-radius curved bridge passing through the lower part of the existing bridge according to claim 1, 2, 3 or 4, wherein the foremost end of the main truss is provided with an auxiliary leg support, and the angle adjustment comprises the following steps: a. loosening the connecting bolts of the rotary flange, starting the front support leg cart to transversely move, starting the reverse roller driving wheel set when the front support leg cart interferes with the front support leg transverse moving track, driving the main truss to backwards move, and adjusting the front support leg transverse moving track to enable the front support leg cart to have a transverse moving space again when the auxiliary support legs stand at the bridge pier; b. after the front support leg transverse moving track is adjusted, the middle support leg reverse roller set is started to move forwards and is stressed when falling to the ground, then the middle support leg cart is started to move transversely, and when the middle support leg cart interferes with the transverse moving track, a jack at the rear part of the rear main truss is supported and stabilized, and then the middle support leg transverse moving track is adjusted; and (c) repeatedly adjusting according to the mode of the step (a) and the step (b) until the angle is adjusted in place, and enabling the auxiliary supporting leg to be located at the front pier.
7. The rotatable ultra-low-altitude bridging construction method for the existing small-radius curve bridge passing through the lower part of the bridge as claimed in claim 6, wherein the traverse limit distance of the front leg cart is about 1m, and the traverse limit distance of the middle leg cart is about 1 m.
8. The rotatable ultra-low-altitude bridge construction method for the curve bridge with the small radius passing through the existing bridge is characterized in that after the angle of the main truss is adjusted to a proper position, the middle supporting leg cross beam is supported in a grounding mode, the crane trolley moves onto the middle supporting leg cross beam, and the front supporting leg is moved to the front pier to be supported in a grounding mode.
9. The rotatable ultra-low-altitude bridge construction method for penetrating the existing small-radius curved bridge downwards according to claim 1, 2, 3 or 4, wherein when the height of the main truss needs to be further reduced, the middle support leg counter-roller is started to move the main truss forwards, the middle support leg cross beam is removed after the main truss is moved in place, the front part of the main truss is supported by the front support leg under the assistance of the jack, and the middle rear part of the main truss is supported by the middle support leg counter-roller in a floor mode.
10. The rotatable ultra-low-altitude bridge construction method for the existing small-radius curved bridge passing through the lower part of the existing bridge according to claim 1 or 2, wherein the upper connecting holes of the rotating flanges are formed in a manner that circular arc slotted holes and circular holes are spaced, and the circular arc slotted holes are arranged in a central symmetry manner on the circumference.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010988761.8A CN112195785B (en) | 2020-09-18 | 2020-09-18 | Rotatable ultra-low-altitude bridge construction method for underpass existing bridge small-radius curve bridge |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010988761.8A CN112195785B (en) | 2020-09-18 | 2020-09-18 | Rotatable ultra-low-altitude bridge construction method for underpass existing bridge small-radius curve bridge |
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| Publication Number | Publication Date |
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| CN112195785A true CN112195785A (en) | 2021-01-08 |
| CN112195785B CN112195785B (en) | 2022-07-01 |
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| CN202010988761.8A Expired - Fee Related CN112195785B (en) | 2020-09-18 | 2020-09-18 | Rotatable ultra-low-altitude bridge construction method for underpass existing bridge small-radius curve bridge |
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Citations (7)
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| JPH08134845A (en) * | 1994-11-11 | 1996-05-28 | Kajima Corp | Erection method of bridge |
| CN103572699A (en) * | 2012-08-03 | 2014-02-12 | 浙江中建路桥设备有限公司 | Novel road bridge girder erection machine |
| CN205893920U (en) * | 2016-05-26 | 2017-01-18 | 浙江中建路桥设备有限公司 | Rotatable middle support leg |
| CN109763430A (en) * | 2019-01-31 | 2019-05-17 | 浙江中建路桥设备有限公司 | A kind of Bridge Erector that curve via holes are set a roof beam in place and its application method |
| CN208884372U (en) * | 2018-09-17 | 2019-05-21 | 中铁二局集团有限公司 | A kind of large-tonnage Bridge Erector for the construction of sharp radius curve railway whole opening box girder |
| CN209276997U (en) * | 2018-08-24 | 2019-08-20 | 浙江中建路桥设备有限公司 | A kind of Novel road bridge girder erection machine |
| CN210066495U (en) * | 2019-01-31 | 2020-02-14 | 浙江中建路桥设备有限公司 | Bridge erecting machine |
-
2020
- 2020-09-18 CN CN202010988761.8A patent/CN112195785B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08134845A (en) * | 1994-11-11 | 1996-05-28 | Kajima Corp | Erection method of bridge |
| CN103572699A (en) * | 2012-08-03 | 2014-02-12 | 浙江中建路桥设备有限公司 | Novel road bridge girder erection machine |
| CN205893920U (en) * | 2016-05-26 | 2017-01-18 | 浙江中建路桥设备有限公司 | Rotatable middle support leg |
| CN209276997U (en) * | 2018-08-24 | 2019-08-20 | 浙江中建路桥设备有限公司 | A kind of Novel road bridge girder erection machine |
| CN208884372U (en) * | 2018-09-17 | 2019-05-21 | 中铁二局集团有限公司 | A kind of large-tonnage Bridge Erector for the construction of sharp radius curve railway whole opening box girder |
| CN109763430A (en) * | 2019-01-31 | 2019-05-17 | 浙江中建路桥设备有限公司 | A kind of Bridge Erector that curve via holes are set a roof beam in place and its application method |
| CN210066495U (en) * | 2019-01-31 | 2020-02-14 | 浙江中建路桥设备有限公司 | Bridge erecting machine |
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| CN112195785B (en) | 2022-07-01 |
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