CN113186798A - Main cable slippage control method in non-support construction process of cable-first and beam-second suspension bridge - Google Patents
Main cable slippage control method in non-support construction process of cable-first and beam-second suspension bridge Download PDFInfo
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- CN113186798A CN113186798A CN202110341791.4A CN202110341791A CN113186798A CN 113186798 A CN113186798 A CN 113186798A CN 202110341791 A CN202110341791 A CN 202110341791A CN 113186798 A CN113186798 A CN 113186798A
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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
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/02—Suspension 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
Abstract
The invention discloses a main cable slippage control method in a cable-first-beam-second suspension bridge non-support construction process, which comprises the following steps: step one, side span beam sections on two sides are symmetrically erected from the side of an anchoring beam section to the side of a cable tower in sequence, and a mid-span beam section is symmetrically erected from the mid-span to the side of the cable tower in sequence; step two, when the mid-span beam section is lifted and erected, the difference between the horizontal force of the main cables on the mid-span side and the horizontal force of the main cables on the side-span side reaches a certain value, and a weight mechanism is arranged on the installed beam section on the side-span side; and step three, unloading the weight mechanism or reducing the weight of the weight mechanism when the side beam sections of the side span are lifted and erected. In the construction process of 'cable first and beam second' of the self-anchored suspension bridge, no bracket is needed in the whole process of midspan/side span, temporary material measure quantity is saved, influence on a navigation channel is reduced, the safety factor of strand sliding resistance is improved by arranging the water bag weight and the tower area suspender to adjust the angle of the main cable, and the stress of the main cable in the construction process is ensured to be safe, reliable and controllable.
Description
Technical Field
The invention relates to the field of non-support construction of a cable-first and beam-second suspension bridge. More specifically, the invention relates to a main cable slippage control method in a cable-first-beam-second suspension bridge non-support construction process.
Background
The self-anchored suspension bridge has an attractive shape and is competitive in urban bridges with 500m span, at present, a support is mostly erected on the self-anchored suspension bridge, a main beam is constructed firstly, then a main cable is constructed, and system conversion is completed by tensioning a suspension rod. The construction method has the disadvantages that navigation cannot be guaranteed, and material measures are high. For the conditions of high navigation requirement, high environmental protection requirement, large span, high investment of temporary supports and high construction difficulty of covering layer thin steel pipe piles, the traditional construction method of 'cable first and beam second' is not economical and reasonable.
A new construction method of a self-anchored suspension bridge is developed, a main cable is constructed firstly, then a temporary anchorage is arranged, a main beam anchoring segment is connected with the temporary anchorage through a temporary buckle cable, the self-anchored suspension bridge is converted into a ground anchored suspension bridge for construction, the main beams are symmetrically lifted and installed until closure, and finally system conversion is completed by removing the temporary buckle cable, so that investment of a temporary support is avoided, and navigation in the whole construction process is guaranteed. Although the method converts the self-anchored suspension bridge into the ground-anchored suspension bridge for construction, the method is still significantly different from the traditional ground-anchored suspension bridge, the rise-span ratio of the method is relatively large, usually about twice, and if the horizontal force of the main cable in the side span is difficult to balance according to the traditional ground-anchored suspension bridge construction process, the slippage control of the cable strand in the construction process is difficult.
Chinese patent publication No. CN110761168A provides a design and construction method of a cable-first and beam-second self-anchored suspension bridge, wherein it is pointed out that, even under the condition that the auxiliary roadway has no temporary navigation requirement, in order to reduce the construction difficulty and save the cost, a temporary support is adopted to erect the side span main beam, and under the condition of temporary navigation, on the basis of the prior treatment, the main beam segment hoisting is required to be performed after the main cable is erected, that is, the temporary support must be erected in the whole construction process, not only a large amount of materials and a large amount of labor are required, but also the environment is polluted, and the erection of the temporary support per se also has a certain influence on the roadway.
Disclosure of Invention
To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a main cable slip control method in a cable-girder-behind suspension bridge non-support construction process, comprising the steps of: constructing and building anchoring beams and cable towers at two sides, wherein the two cable towers are positioned between the two anchoring beams; constructing a temporary anchorage, and installing a temporary guy cable between the temporary anchorage and the anchoring beam; erecting a main cable between the cable tower and the anchoring beam, and further comprising the following steps:
step one, side span beam sections on two sides are symmetrically erected from the side of an anchoring beam section to the side of a cable tower in sequence, a mid-span beam section is symmetrically erected from the mid-span to the side of the cable tower in sequence, and the temporary inhaul cables are synchronously tensioned along with the gradual increase of main cable force during erecting the beam sections so as to balance unbalanced horizontal force at the anchoring beam sections and ensure that the anchoring beam sections have no horizontal displacement;
step two, when the mid-span beam section is lifted and erected, the difference between the horizontal force of the main cables on the mid-span side and the horizontal force of the main cables on the side-span side reaches a certain value, so that the main cable strands slide and the stress safety of a cable tower is influenced, and a weight mechanism is arranged on the installed beam section on the side-span side to adjust the difference between the horizontal forces of the main cables on the side-span side and the main cables on the mid-span side;
and step three, synchronously unloading the weight mechanism or reducing the weight of the weight mechanism when the side span side beam section is hoisted and erected and is hinged with the installed beam section, so that the horizontal forces of the main cables on the two sides of the cable saddle are balanced as much as possible.
According to a preferred embodiment of the present invention, in the main cable slippage control method in the non-support construction process of the cable-first and beam-second suspension bridge, when the mid-span beam section is lifted, the weight of the ballast weight mechanism can be adjusted in real time according to the difference between the horizontal force of the main cable at the side span side and the horizontal force of the main cable at the mid-span side.
According to a preferred embodiment of the present invention, in the main cable slip control method in the non-bracket construction process of the cable-first and beam-second suspension bridge, the ballast mechanism is installed on the span-installed beam section, and the ballast mechanism includes a water bag provided with a water passage for pumping/discharging water to the water area below the suspension bridge to adjust the weight of the ballast mechanism.
According to a preferred embodiment of the present invention, in the main cable slippage control method in the non-support construction process of the cable-first-girder-second suspension bridge, beam sections are installed at both sides of the bridge tower, in the first step, a boom is installed at the side beam section of the bridge tower, and the top of the boom is fixed to the main cables at both sides of the bridge tower through a cable clamp to adjust the tensioning angle.
According to a preferred embodiment of the present invention, in the main cable slippage control method in the non-support construction process of the cable-first and beam-second suspension bridge, the ballast mechanism further includes a main beam, which is arranged on a beam section installed on the side span side, and the water bag is arranged on the main beam.
According to a preferred embodiment of the invention, in the main cable slippage control method in the non-support construction process of the cable-first and beam-second suspension bridge, in the first step, the temporary inhaul cables are tensioned in multiple times to ensure that the anchoring beam section does not have horizontal displacement.
According to a preferred embodiment of the present invention, in the main cable slippage control method in the non-support construction process of the cable-first and beam-second suspension bridge, a plurality of water bags are distributed along different positions, and in the third step, water discharging and unloading processing is performed on the water bags at corresponding positions in real time according to the horizontal force difference borne by the main cable at the side span side and the main cable at the mid-span side.
According to a preferred embodiment of the present invention, in the main cable slippage control method in the non-support construction process of the cable-first and beam-second suspension bridge, a flow detection device is disposed in the water bag or the water passage.
The invention at least comprises the following beneficial effects: in the construction process of 'cable first and beam second' of the self-anchored suspension bridge, no bracket is needed in the whole midspan/side span, so that the temporary material measure amount is saved, and the pollution to the environment and the influence on the channel are reduced. And the anti-sliding safety coefficient of the cable strand is improved by arranging the water bag weight and adjusting the angle of the main cable by the hanger rod in the tower area, the stress of the main cable is safe, reliable and controllable in the construction process, and the main cable is prevented from sliding.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
Fig. 1 is a schematic view of a no-support construction process of a cable-first-girder-second suspension bridge in one embodiment of the present invention.
Fig. 2 is a schematic view of the weight mechanism during hoisting of the midspan beam section in an embodiment of the present invention.
Fig. 3 is a schematic view of the weight mechanism during hoisting of the side span beam segment according to the embodiment of the invention.
Fig. 4 is a schematic view of the angle of the main cable adjusted by the tension suspender according to an embodiment of the invention.
FIG. 5 is a schematic view of the whole water bag during the hoisting of the side span beam section according to one embodiment of the present invention.
FIG. 6 is a schematic top view of a water bag for lifting an edge-span beam section according to an embodiment of the present invention.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be constructed and operated in a particular orientation and thus are not to be considered limiting.
It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.
As shown in fig. 1, the main cable slip control method in the non-support construction process of the cable-first-girder-second suspension bridge of the invention comprises the following steps: constructing and building anchoring beams 1 and cable towers 2 at two sides, wherein the cable towers 2 are positioned between the two anchoring beams 1; constructing a temporary anchorage 3, and installing a temporary guy cable 4 between the temporary anchorage 3 and the anchoring beam 1; erecting a main cable 5 between the cable tower 2 and the anchoring beam 1, further comprising the steps of:
firstly, side span beam sections 61 are symmetrically erected from the side of an anchoring beam section to the side of a cable tower in sequence, mid span beam sections 62 are symmetrically erected from the mid span to the side of a cable tower 2 in sequence, the force of main cables is gradually increased along with the erection of the beam sections, and the temporary stay cables 4 are synchronously tensioned in multiple times so as to balance the unbalanced horizontal force at the anchoring beam section and ensure that the anchoring beam section has no horizontal displacement;
step two, when the mid-span beam section 62 is lifted and erected, the difference between the horizontal force of the main cables on the mid-span side and the horizontal force of the main cables on the side-span side is large, so that the main cable strands slide and the stress safety of a cable tower is influenced, and a weight mechanism is arranged on the installed beam section on the side-span side to adjust the difference between the horizontal forces of the main cables on the side-span side and the main cables on the mid-span side;
and step three, synchronously unloading the weight mechanism 7 or reducing the weight of the weight mechanism 7 when the side span side beam section 61 is hoisted and erected and is hinged with the installed beam section, so that the horizontal forces of the main cables on the two sides of the cable saddle 2 are balanced as much as possible.
In the embodiment, the temporary anchorage 3 is connected with the anchoring beam 1 through the temporary guy cable 4, the main cable force in the construction process is transmitted to the temporary anchorage 3, and the temporary guy cable 4 can be tensioned and adjusted according to the horizontal force generated by the main cable 5 in the construction process so as to eliminate the unbalanced horizontal force at the anchoring beam in the construction process.
The side span main beam is erected by adopting the temporary support in the existing construction process of the cable-first beam and the rear beam, so that a large amount of materials and a large amount of labor are needed, the environment is polluted, the erection of the temporary support can also generate certain influence on a navigation channel, and the part for constructing the temporary support cannot allow ships to pass through. In view of this disadvantage, the above embodiment adopts the construction without the support, and does not adopt the temporary support in the prior art to support the whole process, so as to eliminate all the problems caused by the use of the temporary support, but this will create a new problem: since the span of the self-anchored suspension bridge is usually large, when the beam section is hoisted at the middle side span, the difference of the main cable forces at two sides of the cable tower 1 is large, and the difference of the horizontal included angles at two sides is also large, which brings great difficulty to the sliding control of the main cable.
The above embodiment therefore further proposes a solution: when the side span side beam section 61 is hoisted and erected and is hinged with the installed beam section, the weight mechanism 7 is synchronously unloaded or the weight of the weight mechanism 7 is reduced, so that the horizontal forces of the main cables on the two sides of the cable saddle 2 are balanced as much as possible, and the aim of controlling the main cable 5 to slide is achieved.
In another preferred embodiment, in the main cable slippage control method in the non-support construction process of the cable-first-beam-second suspension bridge, when the mid-span beam section 62 is lifted, the weight of the ballast mechanism can be adjusted in real time according to the difference between the horizontal force of the main cable at the side span side and the horizontal force of the main cable at the mid-span side. The weight of the weight mechanism 7 is adjusted according to the actual force difference at any time to realize the force balance, thereby preventing the main cable 5 from sliding.
In actual construction, the weight mechanism 7 is not directly hung on the main cable 5, because the main cable is easily deformed when being pulled and pressed, and imbalance of the weight mechanism 7 is easily caused, so that the weight mechanism 7 is installed on the beam section to be hung on the side span side in the above embodiment to ensure that the weight mechanism 7 is in a balanced state during construction.
It should be further noted that, in order to adjust the weight of the ballast mechanism 7 at high altitude in the construction process, considering that the whole construction process is performed at high altitude on the water surface, the ballast mechanism 7 is configured to include a water bag 71, the water bag 71 is provided with a water passage so as to be convenient for pumping/discharging water to the water area below the suspension bridge to adjust the weight of the ballast mechanism, so when the ballast is required to be increased, only the water in the water area below the suspension bridge needs to be pumped, if the ballast needs to be discharged, only the water in the water bag 71 needs to be discharged, and the water bag 71 is only used as a container for containing water, and has no other requirements, because the structure is not limited to the conventional water bag.
In order to ensure the balance of the water bags 71, a main beam 72 is further arranged in the weight pressing mechanism 7 and is arranged on the beam section 6 to be lifted and moved on the side span side, and the water bags 71 are arranged on the main beam 72, so that the water bags can be placed in a more balanced manner. And a guardrail 73 is provided on the main beam 72 around the water bag 71 to prevent the water bag 71 from moving in case of tilting. And a lifting lug 74 is arranged on the main beam 72 for convenient lifting construction. And, the water bag 71 as a whole is movably hinged on the main beam 72.
In another preferred embodiment, in the main cable slip control method in the non-support construction process of the cable-first-beam-second suspension bridge, beam sections are installed on two sides of the cable tower 2, in the step one, the suspender 8 can be installed on the cable tower side beam section 63, and the top of the suspender 8 is fixed on the main cables 5 on two sides of the cable tower 2 through a cable clamp to adjust the tension angle of the main cables.
In order to further improve main cable 5's the safety coefficient that slides, another kind of solution has still been proposed to above-mentioned embodiment, when setting up ballast mechanism 7, still is in cable tower curb girder section installation jib 8 utilizes jib 8 adjusts main cable horizontal included angle and improves strand antiskid factor of safety, and 2 both sides jibs 8 of cable tower select stretch-draw as required and relax, and the weight of tower district beam section can be transmitted to the main cable through the jib simultaneously on, adjusts main cable power, and in order to prevent that tower district beam section one side is unsettled, produces "seesaw effect", carries out the ballast at the relevant position and handles, guarantees overall structure's atress safety.
Like this, through tower district jib stretch-draw and the cooperation of water bag ballast weight regulation, and then can further ensure main push-towing rope 5 factor of safety that slides.
To sum up, this application obtains economic reasonable the order of erectting through earlier computational analysis, and the rethread sets up the water bag on the girder bridge floor, carries out the counter weight through the water that extracts in the rivers, also can adjust the counter weight through letting water simultaneously, attaches the tower jib before the tower that the girder corresponds on the tower support through installing mid-span side in advance simultaneously, when adjusting the main push-towing rope angle, adjusts unbalanced main push-towing rope horizontal force as partial counter weight with the beam section of tower district part. The core idea of the control method is to adjust two most critical influence parameters of the slip safety coefficient of the cable strand, namely main cable forces on two sides of the tower top cable saddle and wrap angles of the main cables and the cable saddle.
In another preferred embodiment, in the method for controlling the main cable sliding in the process of the non-support construction of the cable-first and beam-second suspension bridge, in the first step, when the main cable 5 slides, the temporary guy cable 4 is tensioned in several times, so that the temporary guy cable 4 without horizontal displacement of the anchoring beam section can be tensioned and adjusted according to the horizontal force generated by the main cable 5 in the construction process, and the unbalanced horizontal force at the anchoring beam 1 in the construction process is eliminated.
In another preferred embodiment, in the main cable slip control method in the non-support construction process of the cable-first and beam-second suspension bridge, the water bags 71 are distributed along different positions, and in the third step, the water bags 71 at corresponding positions are subjected to water discharging and unloading treatment in real time according to the difference between the horizontal forces borne by the main cable at the side span side and the main cable at the mid-span side, so that accurate adjustment of the main cable force can be realized. The tool capable of conveniently measuring the weight is used for adjusting the weight in real time through the water bag 71, and is convenient to operate, simple and easy to use in actual construction.
In another preferred embodiment, in the main cable slip control method in the non-bracket construction process of the cable-first and beam-second suspension bridge, a flow detection device is arranged in the water bag 71 or the water passage, so that a worker can know the weight adding amount and the load removing amount of water in the water bag 71 conveniently, and can know the increased and decreased water weight accurately.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (8)
1. A main cable slippage control method in a cable-first-beam-second suspension bridge support-free construction process comprises the following steps: constructing and building anchoring beams and cable towers at two sides, wherein the two cable towers are positioned between the two anchoring beams; constructing a temporary anchorage, and installing a temporary guy cable between the temporary anchorage and the anchoring beam; erecting a main cable between the cable tower and the anchoring beam, and characterized by further comprising the following steps:
step one, side span beam sections on two sides are symmetrically erected from the side of an anchoring beam section to the side of a cable tower in sequence, a mid-span beam section is symmetrically erected from the mid-span to the side of the cable tower in sequence, and the temporary inhaul cables are synchronously tensioned along with the gradual increase of main cable force during erecting the beam sections so as to balance unbalanced horizontal force at the anchoring beam sections and ensure that the anchoring beam sections have no horizontal displacement;
step two, when the mid-span beam section is lifted and erected, the difference between the horizontal force of the main cables on the mid-span side and the horizontal force of the main cables on the side-span side reaches a certain value, so that the main cable strands slide and the stress safety of a cable tower is influenced, and a weight mechanism is arranged on the installed beam section on the side-span side to adjust the difference between the horizontal forces of the main cables on the side-span side and the main cables on the mid-span side;
and step three, synchronously unloading the weight mechanism or reducing the weight of the weight mechanism when the side span side beam section is hoisted and erected and is hinged with the installed beam section, so that the horizontal forces of the main cables on the two sides of the cable saddle are balanced as much as possible.
2. The main cable slippage control method in the stentless construction process of the cable-first-beam-second suspension bridge according to claim 1, wherein the weight of the ballast mechanism can be adjusted in real time according to the horizontal force difference of the main cable at the side span side and the main cable at the middle span side in the hoisting process of the middle span beam section.
3. The method of claim 1, wherein the ballast means is installed on the span-mounted beam section, and the ballast means includes a water bag having a water passage for pumping/discharging water to/from the water area under the suspension bridge to adjust the weight of the ballast means.
4. The method for controlling slippage of main cables during the stentless construction of a cable-girder-after-bridge suspension bridge according to claim 1, wherein a girder section is installed at both sides of the bridge tower, and in the first step, the tension angle of the hanger rod is adjusted by installing the hanger rod at the side girder section of the bridge tower, and fixing the top of the hanger rod on the main cables at both sides of the bridge tower through a cable clamp.
5. The method of claim 3, wherein the ballast mechanism further comprises a main beam disposed on the installed beam section on the side span side, and the water bag is disposed on the main beam.
6. The method for controlling main cable slippage during stentless construction of a cable-girder-behind suspension bridge according to claim 1, wherein in the first step, the temporary cables are tensioned in multiple times to ensure that the anchoring girder section has no horizontal displacement.
7. The method according to claim 3, wherein the water bags are distributed along different positions, and in the third step, the water bags at corresponding positions are discharged and unloaded in real time according to the difference between the horizontal forces borne by the main cables at the side span and the main cables at the mid-span.
8. The method for controlling main cable slippage in the stentless construction process of the cable-first-beam-second suspension bridge according to claim 3, wherein a flow detection device is arranged in the water bag or the water channel.
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| CN202110341791.4A CN113186798B (en) | 2021-03-30 | 2021-03-30 | Main cable slippage control method in non-support construction process of cable-first and beam-second suspension bridge |
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| CN202110341791.4A CN113186798B (en) | 2021-03-30 | 2021-03-30 | Main cable slippage control method in non-support construction process of cable-first and beam-second suspension bridge |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114086482A (en) * | 2021-12-13 | 2022-02-25 | 中铁大桥局集团有限公司 | Suspension bridge steel beam erecting method |
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| JPH11323839A (en) * | 1998-05-19 | 1999-11-26 | Shinko Kosen Kogyo Kk | Girder connecting method for suspended structure |
| CN106012797A (en) * | 2016-07-25 | 2016-10-12 | 同济大学 | All-ground-anchor type single-tower double-span cable-stayed bridge structure and construction method thereof |
| CN108643057A (en) * | 2018-06-20 | 2018-10-12 | 大连理工大学 | A kind of interim anchor cable in girder of suspension bridge erection process balances construction method |
| CN109972493A (en) * | 2019-03-15 | 2019-07-05 | 浙江省交通规划设计研究院有限公司 | A kind of self-anchored suspension bridge design and construction method of First cable later girder |
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2021
- 2021-03-30 CN CN202110341791.4A patent/CN113186798B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11323839A (en) * | 1998-05-19 | 1999-11-26 | Shinko Kosen Kogyo Kk | Girder connecting method for suspended structure |
| CN106012797A (en) * | 2016-07-25 | 2016-10-12 | 同济大学 | All-ground-anchor type single-tower double-span cable-stayed bridge structure and construction method thereof |
| CN108643057A (en) * | 2018-06-20 | 2018-10-12 | 大连理工大学 | A kind of interim anchor cable in girder of suspension bridge erection process balances construction method |
| CN109972493A (en) * | 2019-03-15 | 2019-07-05 | 浙江省交通规划设计研究院有限公司 | A kind of self-anchored suspension bridge design and construction method of First cable later girder |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114086482A (en) * | 2021-12-13 | 2022-02-25 | 中铁大桥局集团有限公司 | Suspension bridge steel beam erecting method |
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