CN111962404A - T-shaped rigid frame cantilever bridge synchronous pushing displacement control closure method and cantilever bridge - Google Patents
T-shaped rigid frame cantilever bridge synchronous pushing displacement control closure method and cantilever bridge Download PDFInfo
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- CN111962404A CN111962404A CN202010872644.5A CN202010872644A CN111962404A CN 111962404 A CN111962404 A CN 111962404A CN 202010872644 A CN202010872644 A CN 202010872644A CN 111962404 A CN111962404 A CN 111962404A
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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
- E01D21/10—Cantilevered erection
Abstract
The invention discloses a T-shaped rigid frame cantilever bridge synchronous pushing displacement control closure method and a cantilever bridge, relates to the technical field of bridge erection and aims to solve the technical problem of poor pushing effect at present. The closure method of the cantilever beam bridge comprises the following steps: a plurality of pushing mechanisms are arranged in the first closure opening and the second closure opening which are symmetrically distributed; the main box is controlled to synchronously control a plurality of pushing mechanisms in the first closing port and the second closing port to synchronously push; locking the two cantilever beams on two sides of the first closure opening and locking the two cantilever beams on two sides of the second closure opening; and pouring the first closure opening and the second closure opening. The cantilever beam bridge is closed by adopting the closing method. The invention ensures that all points at the end part of each cantilever beam are stressed consistently, and realizes better pushing effect.
Description
Technical Field
The invention relates to the technical field of bridge erection, in particular to a T-shaped rigid frame cantilever bridge synchronous pushing displacement control closure method and a cantilever bridge.
Background
The cantilever beam bridge is a beam bridge with a pier top fixed beam body and a simple beam with one end or two ends freely hanging outwards as an upper main bearing component. The cantilever beam bridge is influenced by factors such as the dead weight of a beam body, concrete shrinkage and creep in the construction process, the displacement from two ends to the midspan can be generated, secondary stress is generated on the bridge and a pier body, concrete cracking is caused, and the safety of the structure is influenced. Therefore, pushing closure is needed during mid-span closure, namely a horizontal thrust is applied to the two cantilever ends, so that the side piers generate reverse horizontal displacement to offset displacement generated by factors such as temperature difference and later-stage concrete shrinkage and creep, the stress state of the bridge formed by the bridge is improved, and the safety of the bridge structure is ensured.
When pushing and closing the existing cantilever beam bridge, pushing jacks are installed at the closing section, each jack is connected with an oil pump, each oil pump is controlled by one worker, and interphones are used among multiple workers to call to coordinate the work. When the oil pump supplies oil to the jack, the jack applies horizontal thrust to the cantilever end, and then the side pier generates horizontal displacement in the opposite direction.
However, because the oil pumps are controlled by personnel, the time points of operating the oil pumps by each worker cannot be completely the same, so that the pushing of the jacks cannot be synchronous, the stress of each point of the cantilever end is inconsistent, and the pushing effect is poor. Meanwhile, under the condition of not considering displacement, due to the existence of construction friction of a hanging basket, a hanging bracket and the like, although jacking force is achieved, displacement is not controlled in place, and the jacking effect is also influenced.
Disclosure of Invention
The embodiment of the application provides a T-shaped rigid frame cantilever bridge synchronous pushing displacement control closure method and a cantilever bridge, and aims to solve the technical problems that synchronization cannot be realized by pushing of a plurality of jacks at present and the pushing effect is poor.
In a first aspect, the present invention provides a method for closing a cantilever bridge, including:
a plurality of pushing mechanisms are arranged in the first closure opening and the second closure opening which are symmetrically distributed;
the pushing mechanisms in the first closing port and the second closing port are synchronously controlled to synchronously push by controlling the main box;
locking the two cantilever beams at two sides of the first closing opening and locking the two cantilever beams at two sides of the second closing opening;
and pouring the first closure opening and the second closure opening.
In a possible closing method, the synchronously pushing by controlling a main box to synchronously control a plurality of pushing mechanisms in the first closing port and the second closing port comprises:
the control main box controls a plurality of pushing mechanisms in the first closure opening to synchronously push, and control signals are transmitted to the control auxiliary box in real time;
and the control auxiliary box controls a plurality of pushing mechanisms in the second closure mouth to synchronously push.
In a possible closing method, the synchronously pushing by controlling a main box to synchronously control a plurality of pushing mechanisms in the first closing port and the second closing port comprises:
the control main box controls the plurality of pushing mechanisms in the first closure mouth and the plurality of pushing mechanisms in the second closure mouth to synchronously carry out graded pushing;
and the plurality of pushing mechanisms synchronously perform pressure maintaining after each stage of pushing is finished.
In a possible closure method, further comprising:
displacement observation points and elevation observation points are arranged on the end surfaces of the two cantilever beams on the two sides of the first closing opening and the end surfaces of the two cantilever beams on the two sides of the second closing opening;
measuring the distance between the displacement observation points on the two sides of the first closure opening and the elevation of each elevation observation point after pressure maintaining each time, and determining the displacement and the height difference of the two cantilever beams on the two sides of the first closure opening;
measuring the distance between the displacement observation points on the two sides of the second closure opening and the elevation of each elevation observation point after each pressure maintaining, and determining the displacement and the height difference of the two cantilever beams on the two sides of the second closure opening;
and after pushing is finished, determining the accumulated displacement and the accumulated height difference of the two cantilever beams at the two sides of the first closing opening and the accumulated displacement and the accumulated height difference of the two cantilever beams at the two sides of the second closing opening.
In a possible closure method, the setting a displacement observation point and an elevation observation point on end surfaces of two cantilever beams on two sides of the first closure opening and end surfaces of two cantilever beams on two sides of the second closure opening includes:
the displacement observation points are arranged at the symmetrical positions on two sides of the center line of the cantilever beam end surface at two sides of the first closing port and the symmetrical positions on two sides of the center line of the cantilever beam end surface at two sides of the second closing port;
and the elevation observation points are arranged at the center line positions of the cantilever beam end surfaces on two sides of the first closure opening and the center line positions of the cantilever beam end surfaces on two sides of the second closure opening.
In a possible closing method, a plurality of pushing mechanisms are installed in a first closing opening and a second closing opening which are symmetrically distributed, and the method comprises the following steps:
a plurality of supporting plates are arranged at the end parts of the cantilever beams on the two sides of the first closing port and the end parts of the cantilever beams on the two sides of the second closing port, and each supporting plate is parallel to the end surface of the corresponding cantilever beam;
mounting a rear seat on the supporting plate on one side of the first closing opening and the supporting plate on one side of the second closing opening, and enabling the length direction of the rear seat to be parallel to the length direction of the corresponding cantilever beam;
and a jack is arranged on each rear seat, and the front end of the jack is close to or abutted against the supporting plate on the other side.
In one possible closing method, the arranging support plates at the end portions of the cantilever beams on two sides of the first closing opening and the end portions of the cantilever beams on two sides of the second closing opening comprises:
and embedding the support plate before pouring the last sections of the cantilever beams on two sides of the first closure opening and the cantilever beams on two sides of the second closure opening.
In one possible closing method, the arranging support plates at the end portions of the cantilever beams on two sides of the first closing opening and the end portions of the cantilever beams on two sides of the second closing opening comprises:
if the cantilever beam is a corrugated steel web cantilever box beam, arranging the supporting plates at the middle line position of a top plate and the middle line position of a bottom plate of the cantilever beam;
if the cantilever beam is a T-shaped rigid frame cantilever box beam, the supporting plates are arranged at the centroid positions of the web plate block sections on the two sides of the cantilever beam.
In a possible closure method, the locking two cantilever beams at two sides of the first closure opening and the locking two cantilever beams at two sides of the second closure opening include:
before the cantilever beams on two sides of the first closure opening and the last sections of the cantilever beams on two sides of the second closure opening are poured, a locking plate is embedded;
a first locking framework is arranged between two opposite locking plates of the first closure opening so as to lock the positions of the cantilever beams on two sides of the first closure opening;
and a second locking framework is arranged between the two opposite locking plates of the second closure opening so as to lock the positions of the cantilever beams at two sides of the second closure opening.
In a second aspect, the invention provides a cantilever bridge, which adopts the method for controlling closure by synchronously pushing and displacing the T-shaped rigid frame cantilever bridge in the first aspect.
The application provides a T-shaped rigid frame cantilever beam bridge synchronous pushing displacement control closure method, a plurality of pushing mechanisms are arranged in a first closure opening and a second closure opening which are symmetrically distributed, and a main control box synchronously controls the inside of the first closure opening and the inside of the second closure opening to synchronously push, so that the plurality of pushing mechanisms in the first closure opening synchronously push, the plurality of pushing mechanisms in the second closure opening synchronously push, the pushing mechanisms in the first closure opening and the second closure opening are also synchronous, further each point of the end part of each cantilever beam is stressed consistently, the pushing progress of the two closure openings are synchronous, a better pushing effect is realized, then two cantilever beams on two sides of the first closure opening and two cantilever beams on two sides of the second closure opening are locked, and the first closure opening and the second closure opening are poured, and completing closure of the cantilever bridge. The invention also provides a cantilever bridge which adopts the T-shaped rigid frame cantilever bridge synchronous pushing displacement control closure method for closure, and the closure effect is better.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a closure method of a cantilever bridge according to an embodiment of the present disclosure;
fig. 2 is a specific flowchart for controlling a main box to control a plurality of pushing mechanisms to perform synchronous pushing according to the embodiment of the present application;
fig. 3 is a flowchart illustrating a specific process of controlling a main box to control a plurality of pushing mechanisms to push in a stepped manner according to an embodiment of the present disclosure;
FIG. 4 is a flowchart of determining an accumulated displacement and an accumulated height difference according to an embodiment of the present disclosure;
fig. 5 is a specific flowchart for setting a displacement observation point and an elevation observation point according to the embodiment of the present application;
FIG. 6 is a flow chart of the installation of multiple pushing mechanisms provided by the embodiments of the present application;
FIG. 7 is a detailed flow chart of the locking cantilever provided by the embodiments of the present application;
FIG. 8 is a schematic structural diagram of a cantilever bridge according to an embodiment of the present disclosure;
fig. 9 is a schematic structural view illustrating the pushing mechanism according to the embodiment of the present disclosure mounted on the cantilever beam;
FIG. 10 is a schematic structural view of a corrugated steel web cantilever box beam provided by an embodiment of the present application;
fig. 11 is a schematic structural diagram of a T-shaped rigid frame cantilever box beam provided in an embodiment of the present application;
fig. 12 is a schematic structural diagram of the first closure opening provided in the embodiment of the present application being locked.
Reference numerals: 10-cantilever beam; 11-a first closure opening; 12-a second closing port; 20-a pushing mechanism; 21-a support plate; 22-a rear seat; 23-a jack; 30-control the main box; 40-control the auxiliary box; 50-a first locking skeleton; 60-locking plate.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The embodiment of the invention provides a method for controlling closure of a T-shaped rigid frame cantilever bridge by synchronously pushing and displacing, and refers to fig. 1 to 12 in the attached drawings.
As shown in fig. 1, 8, 9 and 12, the closure method of the cantilever bridge includes the following steps.
Step S101, a plurality of pushing mechanisms 20 are respectively arranged in the first closing opening 11 and the second closing opening 12 which are symmetrically distributed.
Step S102, synchronously controlling a plurality of pushing mechanisms 20 in the first closing port 11 and the second closing port 12 to push synchronously by controlling the main box 30.
Step 103, locking the two cantilever beams 10 at two sides of the first closing opening 11 and locking the two cantilever beams 10 at two sides of the second closing opening 12.
And step S104, pouring the first closing opening 11 and the second closing opening 12.
Taking the cantilever beam bridge shown in fig. 8 as an example, the cantilever beam bridge has three cantilever beams 10, a first closing opening 11 is formed between the cantilever beam 10 on the left side and the cantilever beam 10 in the middle in fig. 8, a second closing opening 12 is formed between the cantilever beam 10 on the right side and the cantilever beam 10 in the middle, and the first closing opening 11 and the second closing opening 12 are symmetrical about the middle position of the cantilever beam bridge.
Of course, the cantilever bridge may also comprise other numbers of cantilever beams 10. For example, the cantilever bridge includes five cantilever beams 10, at this time, two closure openings are formed together, each closure opening includes a first closure opening and a second closure opening 12, and the first closure opening 11 and the second closure opening 12 in each closure opening are symmetrical with respect to the cantilever bridge, and the closure method provided in this embodiment is used for closing each closure opening. For example, the cantilever bridge includes four cantilever beams 10, at this time, three closure ports are formed together, the closure ports located at two sides are a first closure port 11 and a second closure port 12, respectively, and the closure port located at the middle part does not belong to the first closure port 11 or the second closure port 12 because there is no closure port symmetrical to the closure port, and the closure port at the middle part can be closed by using a pushing method first, and then the closure ports located at two sides are closed by using the closure method provided in this embodiment for the first closure port 11 and the second closure port 12.
Specifically, when the step S101 is implemented, a plurality of pushing mechanisms 20 are installed at the first closing opening 11, and then a plurality of pushing mechanisms 20 are installed at the second closing opening 12; or, a plurality of pushing mechanisms 20 are installed on the second closing opening 12, and then a plurality of pushing mechanisms 20 are installed on the first closing opening 11; or, a plurality of pushing mechanisms 20 are simultaneously installed on the first closing opening 11 and the second closing opening 12.
After the pushing mechanisms 20 are installed in the first closing opening 11 and the second closing opening 12, step S102 is performed, and the plurality of pushing mechanisms 20 in the first closing opening 11 and the second closing opening 12 are synchronously controlled by the control main box 30 to synchronously push. Specifically, the control main box 30 is operated by a constructor, and the control main box 30 can control the plurality of pushing mechanisms 20 in the first closing port 11 and the second closing port 12 to push synchronously, that is, all the pushing mechanisms 20 push synchronously under the control of the control main box 30, so that the plurality of pushing mechanisms 20 in the first closing port 11 push synchronously, the plurality of pushing mechanisms 20 in the second closing port 12 push synchronously, and the pushing mechanisms 20 in the first closing port 11 and the pushing mechanisms 20 in the second closing port 12 are also synchronous, so that each point of the end of each cantilever beam 10 is stressed consistently, the pushing progress of the two closing ports is synchronous, and a good pushing effect is achieved.
After the pushing mechanism 20 pushes, the reverse pre-deviation quantity applied to the side pier offsets the deviation quantity caused by the later operation, creep and shrinkage of the concrete of the cantilever beam 10, prevents the concrete cantilever beam 10 from generating shrinkage cracks in the traffic operation process, prolongs the service life of the bridge, and ensures the quality safety of the bridge structure.
After the first closing port 11 and the second closing port 12 are pushed synchronously, step S103 is performed. The two cantilever beams 10 on the two sides of the first closing opening 11 are locked, and the two cantilever beams 10 on the two sides of the second closing opening are locked, so that the cantilever beams 10 are kept in a pushed state, the two cantilever beams 10 on the two sides of the first closing opening 11 are fixedly connected into a whole, and the two cantilever beams 10 on the two sides of the second closing opening 12 are fixedly connected into a whole, and the cantilever beams 10 are prevented from extending and contracting due to temperature changes.
Finally, step S104 is performed. Specifically, steel bars are bound in the first closing opening 11 and the second closing opening 12, concrete is poured, and closing of the first closing opening 11 and the second closing opening 12 of the cantilever beam bridge is achieved after pouring is completed. Before step S104, the ejector mechanism 20 may be detached, and the detached ejector mechanism 20 may be used in the next closing.
The closure method can be implemented at low temperature, such as at night, so that the influence of high temperature on the pushing process and the pouring process can be avoided, and the quality of the first closure opening 11 and the second closure opening 12 after pouring is improved.
As shown in fig. 2, step S102 is to synchronously control the pushing mechanisms 20 in the first closing port 11 and the second closing port 12 to push synchronously by controlling the main box 30, which specifically includes the following steps.
Step S201, the main control box 30 controls the plurality of pushing mechanisms 20 in the first closing port 11 to push synchronously, and transmits the control signal to the auxiliary control box 40 in real time.
Step S202, controlling the auxiliary box 40 to control the plurality of pushing mechanisms 20 in the second closing port 12 to push synchronously.
As shown in fig. 9, when closing the cantilever bridge, a control sub-tank 40 is provided in addition to the control main tank 30. The control main box 30 is connected with the plurality of pushing mechanisms 20 in the first closing port 11, and can directly control the plurality of pushing mechanisms 20 in the first closing port 11, so that the plurality of pushing mechanisms 20 in the first closing port 11 push synchronously. The control auxiliary box 40 is connected with the plurality of pushing mechanisms 20 in the second closing port 12, and can directly control the plurality of pushing mechanisms 20 in the second closing port 12, so that the plurality of pushing mechanisms 20 in the second closing port 12 push synchronously. In addition, the control main box 30 is in signal connection with the control main box 30, and the signal connection can be wireless connection or wired connection; the control main box 30 sends a control signal to the control auxiliary box 40 while controlling the plurality of thrusting mechanisms 20 in the first closing port 11, and controls the plurality of thrusting mechanisms 20 in the second closing port 12 after receiving the control signal, so that the control auxiliary box 40 realizes indirect control over the plurality of thrusting mechanisms 20 in the second closing port 12, and further the thrusting mechanisms 20 in the first closing port 11 and the thrusting mechanisms 20 in the second closing port 12 are synchronized.
Step S201 and step S202 are performed simultaneously.
Specifically, the control main box 30 is provided with a first button, a second button, a third button, a fourth button and a fifth button, which are respectively used for controlling the pushing, oil returning, pushing target displacement, pushing speed and oil returning roof of the pushing mechanism 20.
Of course, in addition to implementing step S201 and step S202 to make the main control box 30 directly control the plurality of pushing mechanisms 20 in the first closing port 11 and indirectly control the plurality of pushing mechanisms 20 in the second closing port 12, the main control box 30 may be directly connected to all the pushing mechanisms 20, and when the constructor operates the main control box 30, the main control box 30 directly and synchronously controls all the pushing mechanisms 20.
Further, as shown in fig. 3, step S102 is to synchronously control the plurality of pushing mechanisms 20 in the first closing port 11 and the second closing port 12 to synchronously push through controlling the main box 30, and specifically includes the following steps.
Step S301, the main box 30 is controlled to control the plurality of pushing mechanisms 20 in the first closing port 11 and the plurality of pushing mechanisms 20 in the second closing port 12 to synchronously push in a grading manner.
Step S302, after each stage of pushing is completed, the plurality of pushing mechanisms 20 synchronously perform pressure maintaining.
The step pushing means to step the pushing force of the pushing mechanism 20 and then control the main box 30 to control the pushing mechanism 20 to push step by step. For example, the pushing force of the pushing mechanism 20 is divided into four stages, which are: the control method comprises the steps of controlling a main box 30 to firstly control a pushing mechanism 20 to push the cantilever beam 10 by 25% of total top thrust, controlling the main box 30 to control the pushing mechanism 20 to push the cantilever beam 10 by 50% of total top thrust, controlling the main box 30 to control the pushing mechanism 20 to maintain pressure, namely keeping 25% of total top thrust for 5 minutes, and then controlling the main box 30 to control the pushing mechanism 20 to push the cantilever beam 10 by 50% of total top thrust. The pushing process with 50% total top pushing force, 75% total top pushing force and 100% total top pushing force is the same as the above. The graded jacking can gradually load the jacking force applied to the cantilever beam 10, and the cantilever beam 10 can be prevented from being damaged due to the suddenly loaded overlarge jacking force. Of course, the pushing force of the pushing mechanism 20 may also be divided into other stages, for example, 20% total pushing force, 40% total pushing force, 60% total pushing force, 80% total pushing force and 100% total pushing force, and the staged pushing process is the same as the above process, and will not be described herein again.
The pressure maintaining means that after the pushing mechanism 20 completes one stage of pushing, the pushing mechanism 20 maintains the current pushing force for a period of time, such as 5 minutes, 10 minutes, etc., so that the cantilever 10 gradually adapts to the loaded pushing force, and also provides for pushing or locking the closure opening at the next stage.
In the case of performing steps S301 and S302, the control of the main box 30 may be performed such that the plurality of jack mechanisms 20 in the first closing port 11 are directly controlled and the plurality of jack mechanisms 20 in the second closing port 12 are indirectly controlled, or the control of the main box 30 may be performed such that all the jack mechanisms 20 are directly and synchronously controlled.
Of course, the main control box 30 may also control the plurality of pushing mechanisms 20 in the first closing port 11 and the plurality of pushing mechanisms 20 in the second closing port 12 to push with the same level of pushing force. For example, the main control box 30 controls the plurality of pushing mechanisms 20 in the first closing port 11 and the plurality of pushing mechanisms 20 in the second closing port 12 to push at 75% of the total pushing force.
As shown in fig. 4, the closure method further includes the following steps.
Step S401, displacement observation points and elevation observation points are arranged on the end surfaces of the two cantilever beams 10 on the two sides of the first closing opening 11 and the end surfaces of the two cantilever beams 10 on the two sides of the second closing opening 12.
Step S402, measuring the distance between the displacement observation points on the two sides of the first closure port 11 and the elevation of each elevation observation point after pressure maintaining, and determining the displacement and the elevation difference of the two cantilever beams 10 on the two sides of the first closure port 11.
And S403, measuring the distance between the displacement observation points on the two sides of the second closure spout 12 and the elevation of each elevation observation point after pressure maintaining, and determining the displacement and the elevation difference of the two cantilever beams 10 on the two sides of the second closure spout 12.
Step S404, after the pushing is completed, determining the accumulated displacement amount and the accumulated height difference of the two cantilever beams 10 at the two sides of the first closing port 11, and the accumulated displacement amount and the accumulated height difference of the two cantilever beams 10 at the two sides of the second closing port 12.
By measuring the distance between the displacement observation points at the two sides of the first closing opening 11, the displacement and the displacement of the two cantilever beams 10 at the two sides of the first closing opening 11 after each stage of pushing can be timely obtained, and the accumulated displacement after the pushing is completed can be obtained. Similarly, by measuring the distance between the displacement observation points at the two sides of the second closing opening 12, the displacement of the two cantilever beams 10 at the two sides of the second closing opening 12 after pushing at each stage can be timely obtained, and the accumulated displacement after pushing is completed can be obtained. The displacement can be measured by using a steel tape, a laser range finder and other devices.
By measuring the elevations of the elevation observation points at the two sides of the first closing port 11 and calculating the difference value of the elevation observation points at the two sides, the height difference of the cantilever beam 10 after each stage of top pushing at the two sides of the first closing port 11 and the accumulated height difference after the top pushing are obtained. By measuring the elevation of the elevation observation points at the two sides of the second closing opening 12 and calculating the difference value of the elevation observation points at the two sides, the height difference of the cantilever beam 10 pushed at each stage at the two sides of the second closing opening 12 and the accumulated height difference after pushing are obtained. The measured elevation can be measured by tools such as an optical level gauge and the like.
Wherein, the step S402 and the step S403 do not distinguish the sequence. Step S402 may be performed first, and then step S403 may be performed; step S403 may be performed first, and then step S402 may be performed; step S402 and step S403 may be performed simultaneously.
As shown in fig. 5, step S401 sets displacement observation points and elevation observation points on the end surfaces of the two cantilever beams 10 on both sides of the first closing port 11 and on the end surfaces of the two cantilever beams 10 on both sides of the second closing port 12, and specifically includes the following steps.
Step S501, displacement observation points are arranged at the symmetrical positions on the two sides of the center line of the end surfaces of the cantilever beams 10 at the two sides of the first closing port 11 and the symmetrical positions on the two sides of the center line of the end surfaces of the cantilever beams 10 at the two sides of the second closing port 12.
Step S502, setting elevation observation points at the center line positions of the end surfaces of the cantilever beams 10 on the two sides of the first closing port 11 and the center line positions of the end surfaces of the cantilever beams 10 on the two sides of the second closing port 12.
Wherein, the step S501 and the step S502 do not distinguish the sequence. Step S501 may be performed first, and then step S502 may be performed; step S501 may be performed after step S502 is performed; step S501 and step S502 may be performed simultaneously.
Of course, the displacement observation point and the elevation observation point can be arranged at other positions according to actual conditions and actual needs.
As shown in fig. 6, in step S101, a plurality of pushing mechanisms 20 are respectively installed in the first closing opening 11 and the second closing opening 12 which are symmetrically distributed, and the method specifically includes the following steps.
Step S601, arranging a plurality of support plates 21 at the end portions of the cantilever beams 10 at the two sides of the first closing port 11 and the end portions of the cantilever beams 10 at the two sides of the second closing port 12, and enabling each support plate 21 to be parallel to the end surface of the corresponding cantilever beam 10.
In step S602, the rear seat 22 is mounted on both the support plate 21 on the first closing port 11 side and the support plate 21 on the second closing port 12 side, and the longitudinal direction of the rear seat 22 is parallel to the longitudinal direction of the corresponding cantilever 10.
Step S603 is to attach a jack 23 to each rear seat 22 and to bring the front end of the jack 23 close to or into abutment with the support plate 21 on the other side.
The pushing mechanism 20 is specifically configured as shown in fig. 9, and includes a jack 23, a rear seat 22, and two support plates 21. The two support plates 21 are respectively installed at the end parts of the two cantilever beams 10 at the two sides of the first closing opening 11 or the second closing opening 12, one end of the rear seat 22 is connected with one support plate 21, and the other end of the rear seat 22 is connected with the rear part of the jack 23. The front end of the jack 23 is close to or abuts against the other support plate 21. The control main box 30 is communicated with the jack 23 in the first closure port 11 through an oil pipe, and controls the first jack 23 to push; the control auxiliary box 40 is connected with the jack 23 of the second closure opening 12 through an oil pipe, and controls the second jack 23 to push; the control main box 30 sends a control signal to the control auxiliary box 40 while controlling the jack 23 in the first closing port 11, and controls the jack 23 in the second closing port 12 after receiving the control signal.
The specific structure of the rear seat 22 may be a 36a i-beam, and one end of the rear seat 22 is welded to the support plate 21.
The steps S601, S602, and S603 can be performed by attaching a plurality of pushing mechanisms 20 shown in fig. 9 to the first closing port 11 and the second closing port 12.
Taking the rear seat 22 in the first closing opening 11 as an example, the length of the rear seat 22 may be the length obtained by subtracting the length of the retracted state of the jack 23 from the distance between the two corresponding support plates 21 of the first closing opening 11, and when step S603 is performed, the front end of the jack 23 abuts against the other support plate 21; when the length of the seat 22 is less than the distance between the two corresponding support plates 21 of the first closure 11 minus the length of the retracted state of the jack 23, then step S603 is performed, the front end of the jack 23 is close to the support plate 21 on the other side, and a certain gap is kept between the support plate 21 and the support plate 21, and the gap may be 20-30mm, and is not abutted against the support plate 21, so that the installation of the jack 23 can be facilitated.
Taking a pushing mechanism 20 in the first closing opening 11 as an example, when the jack 23 applies pushing force outwards, the front end of the jack 23 directly abuts against one of the supporting plates 21 and applies the pushing force, and the pushing force is applied to the cantilever beam 10 on one side through the supporting plate 21; the rear part of the jack 23 is connected with the rear seat 22, and the jacking force exerted outwards by the rear part of the jack 23 acts on the rear seat 22 and is applied to the cantilever beam 10 on the other side through the rear seat 22 and the other support plate 21. Similarly, the operation of the other pushing mechanisms 20 in the second closing port 12 and the pushing mechanism 20 of the second closing port 12 are the same as the above.
In addition, in step S601, each support plate 21 is parallel to the end surface of the corresponding cantilever beam 10, and in step S602, the length direction of the rear seat 22 is parallel to the length direction of the corresponding cantilever beam 10, so that the direction of the pushing force applied to the cantilever beam 10 by the jack 23 through the rear seat 22 and the support plate 21 is parallel to the length direction of the cantilever beam 10, the pushing direction of the jack 23 is ensured, and the cantilever beam 10 is prevented from deviating in the pushing process.
In the step S602, the support plates 21 are respectively disposed at the end portions of the cantilever beams 10 on both sides of the first closing port 11 and the end portions of the cantilever beams 10 on both sides of the second closing port 12, which specifically includes the following steps.
Before the cantilever beams 10 at two sides of the first closing opening 11 and the last sections of the cantilever beams 10 at two sides of the second closing opening 12 are poured, the supporting plates 21 are buried.
The cantilever beams 10 can be constructed by a hanging basket suspension casting method during construction, and each cantilever beam 10 is divided into a plurality of blocks for construction. In the above steps, the last section of the cantilever beam 10 refers to a section of the cantilever beam 10 before the first closing opening 11 or the second closing opening 12, and the support plate 21 is embedded before the last section of the cantilever beam 10 is poured, so that the support plate 21 can be poured into the cantilever beam 10, and the connection between the support plate 21 and the cantilever beam 10 is firmer.
The supporting plates 21 are respectively arranged at the end parts of the cantilever beams 10 at the two sides of the first closing opening 11 and the end parts of the cantilever beams 10 at the two sides of the second closing opening 12, and the method specifically comprises the following conditions.
If the cantilever beam 10 is a corrugated steel web cantilever box beam, the support plate 21 is disposed at both the top plate centerline and the bottom plate centerline of the cantilever beam 10, as shown in fig. 10.
If the cantilever beam 10 is a T-shaped rigid frame cantilever box beam, the support plates 21 are disposed at the centroid positions of the web block sections on both sides of the cantilever beam 10, as shown in fig. 11.
The central line position of the top plate refers to the position of the symmetrical line of the top plate; the central line position of the bottom plate refers to the position of the symmetrical line of the bottom plate. By centroid location of a web segment is meant the location of the center of the shape of the web segment.
Of course, the support plate 21 may be disposed at other positions according to actual requirements, except for the positions of the center line of the top plate and the center line of the bottom plate of the corrugated steel web cantilever box girder, or the centroid positions of the web block sections at the two sides of the T-shaped rigid frame cantilever box girder. For example, the supporting plates 21 are arranged on two sides of the center line position of the top plate of the corrugated steel web cantilever box girder, and the supporting plates 21 are arranged on two sides of the center line position of the bottom plate.
In addition, if the cantilever beam 10 is a corrugated steel web cantilever box beam or another type of box beam other than a T-shaped rigid frame cantilever box beam, the support plate 21 may be provided according to the specific shape of the end surface of the cantilever beam 10.
As shown in fig. 10 to 12 and fig. 7, the step S103 of locking the two cantilever beams 10 at two sides of the first closing opening 11 and the two cantilever beams 10 at two sides of the second closing opening 12 specifically includes the following steps.
And step S701, embedding the locking plate 60 before pouring the last sections of the cantilever beams 10 on the two sides of the first closing opening 11 and the cantilever beams 10 on the two sides of the second closing opening 12.
Step S702, arranging first locking skeletons 50 between two opposite locking plates 60 of the first closing opening 11, so as to lock positions of the cantilever beams 10 on two sides of the first closing opening 11.
Step S703, arranging second locking frameworks 50 between the two opposite locking plates 60 of the second closing opening 12, so as to lock the positions of the cantilever beams 10 on the two sides of the second closing opening 12.
The last segment of the cantilever 10 in step S701 is a segment of the cantilever 10 before the first closing opening 11 or the second closing opening 12. As shown in fig. 10 and 11, embedding the locking plate 60 before pouring the last section of the cantilever 10 can anchor the locking plate 60 in the cantilever 10, so that the locking plate 60 and the cantilever 10 are firmly connected.
By implementing the step S702, as shown in fig. 12, two ends of the first locking framework 50 are respectively and fixedly connected to the two corresponding locking plates 60 at two sides of the first closing opening 11, and the first locking framework 50 locks the two cantilever beams 10 at two sides of the first closing opening 11, so that the two cantilever beams 10 at two sides of the first closing opening 11 are fixedly connected into a whole, thereby avoiding the extension and contraction of the cantilever beams 10 caused by the change of air temperature and ensuring the quality of the first closing opening 11 after pouring.
Similarly, by implementing step S703, two ends of the second locking framework are respectively fixedly connected to the two corresponding locking plates 60 on two sides of the second closing opening 12, and the second locking framework locks the two cantilever beams 10 on two sides of the second closing opening 12, so that the two cantilever beams 10 on two sides of the second closing opening 12 are fixedly connected into a whole, thereby avoiding the extension and contraction of the cantilever beams 10 caused by temperature change, and ensuring the quality of the second closing opening 12 after pouring.
The first locking framework 50 and the second locking framework may both be stiff frameworks, and of course, the first locking framework 50 and/or the second locking framework may also be other types of structures, such as i-beams.
In addition, the embodiment also provides a cantilever bridge which adopts the T-shaped rigid frame cantilever bridge synchronous pushing displacement control closure method for closure. When the closing method of the cantilever beam bridge is adopted to close the cantilever beam bridge, the stress of each point of the end part of each cantilever beam 10 can be consistent, the pushing progress of the first closing port 11 and the second closing port 12 of the cantilever beam bridge is synchronous, the closing elevation control meets the regulation, the displacement control approaches to the theoretical calculation value, the better pushing effect is realized, and the engineering quality and the service life of the cantilever beam bridge are further improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; 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; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A T-shaped rigid frame cantilever bridge synchronous pushing displacement control closure method is characterized by comprising the following steps:
a plurality of pushing mechanisms are arranged in the first closure opening and the second closure opening which are symmetrically distributed;
the pushing mechanisms in the first closing port and the second closing port are synchronously controlled to synchronously push by controlling the main box;
locking the two cantilever beams at two sides of the first closing opening and locking the two cantilever beams at two sides of the second closing opening;
and pouring the first closure opening and the second closure opening.
2. The method for controlling closure of the T-shaped rigid frame cantilever bridge by synchronously pushing displacement according to claim 1, wherein the step of synchronously controlling the plurality of pushing mechanisms in the first closure and the second closure by controlling the main box to synchronously push comprises the following steps:
the control main box controls a plurality of pushing mechanisms in the first closure opening to synchronously push, and control signals are transmitted to the control auxiliary box in real time;
and the control auxiliary box controls a plurality of pushing mechanisms in the second closure mouth to synchronously push.
3. The T-shaped rigid frame cantilever bridge synchronous pushing displacement control closure method according to claim 1 or 2, wherein the step of synchronously controlling a plurality of pushing mechanisms in the first closure and the second closure to push synchronously by controlling a main box comprises the following steps:
the control main box controls the plurality of pushing mechanisms in the first closure mouth and the plurality of pushing mechanisms in the second closure mouth to synchronously carry out graded pushing;
and the plurality of pushing mechanisms synchronously perform pressure maintaining after each stage of pushing is finished.
4. The T-shaped rigid frame cantilever bridge synchronous pushing displacement control closure method according to claim 3, further comprising:
displacement observation points and elevation observation points are arranged on the end surfaces of the two cantilever beams on the two sides of the first closing opening and the end surfaces of the two cantilever beams on the two sides of the second closing opening;
measuring the distance between the displacement observation points on the two sides of the first closure opening and the elevation of each elevation observation point after pressure maintaining each time, and determining the displacement and the height difference of the two cantilever beams on the two sides of the first closure opening;
measuring the distance between the displacement observation points on the two sides of the second closure opening and the elevation of each elevation observation point after each pressure maintaining, and determining the displacement and the height difference of the two cantilever beams on the two sides of the second closure opening;
and after pushing is finished, determining the accumulated displacement and the accumulated height difference of the two cantilever beams at the two sides of the first closing opening and the accumulated displacement and the accumulated height difference of the two cantilever beams at the two sides of the second closing opening.
5. The synchronous pushing displacement control closure method for the T-shaped rigid frame cantilever bridge according to claim 4, wherein displacement observation points and elevation observation points are arranged on the end surfaces of the two cantilever beams on both sides of the first closure port and the end surfaces of the two cantilever beams on both sides of the second closure port, and the method comprises the following steps:
the displacement observation points are arranged at the symmetrical positions on two sides of the center line of the cantilever beam end surface at two sides of the first closing port and the symmetrical positions on two sides of the center line of the cantilever beam end surface at two sides of the second closing port;
and the elevation observation points are arranged at the center line positions of the cantilever beam end surfaces on two sides of the first closure opening and the center line positions of the cantilever beam end surfaces on two sides of the second closure opening.
6. The method for synchronously pushing and controlling closure of the cantilever bridge with the T-shaped rigid frame according to claim 1, wherein a plurality of pushing mechanisms are respectively installed in the first closure opening and the second closure opening which are symmetrically distributed, and the method comprises the following steps:
a plurality of supporting plates are arranged at the end parts of the cantilever beams on the two sides of the first closing port and the end parts of the cantilever beams on the two sides of the second closing port, and each supporting plate is parallel to the end surface of the corresponding cantilever beam;
mounting a rear seat on the supporting plate on one side of the first closing opening and the supporting plate on one side of the second closing opening, and enabling the length direction of the rear seat to be parallel to the length direction of the corresponding cantilever beam;
and a jack is arranged on each rear seat, and the front end of the jack is close to or abutted against the supporting plate on the other side.
7. The T-shaped rigid frame cantilever bridge synchronous pushing displacement control closure method according to claim 6, wherein the supporting plates are arranged at the end parts of the cantilever beams at two sides of the first closure port and the end parts of the cantilever beams at two sides of the second closure port, and the method comprises the following steps:
and embedding the support plate before pouring the last sections of the cantilever beams on two sides of the first closure opening and the cantilever beams on two sides of the second closure opening.
8. The T-shaped rigid frame cantilever bridge synchronous pushing displacement control closure method according to claim 6, wherein the supporting plates are arranged at the end parts of the cantilever beams at two sides of the first closure port and the end parts of the cantilever beams at two sides of the second closure port, and the method comprises the following steps:
if the cantilever beam is a corrugated steel web cantilever box beam, arranging the supporting plates at the middle line position of a top plate and the middle line position of a bottom plate of the cantilever beam;
if the cantilever beam is a T-shaped rigid frame cantilever box beam, the supporting plates are arranged at the centroid positions of the web plate block sections on the two sides of the cantilever beam.
9. The method for synchronously pushing and displacing to control closure of the T-shaped rigid frame cantilever beam bridge according to claim 1, wherein the locking the two cantilever beams at two sides of the first closure opening and the two cantilever beams at two sides of the second closure opening comprises:
before the cantilever beams on two sides of the first closure opening and the last sections of the cantilever beams on two sides of the second closure opening are poured, a locking plate is embedded;
a first locking framework is arranged between two opposite locking plates of the first closure opening so as to lock the positions of the cantilever beams on two sides of the first closure opening;
and a second locking framework is arranged between the two opposite locking plates of the second closure opening so as to lock the positions of the cantilever beams at two sides of the second closure opening.
10. A cantilever bridge, characterized in that the cantilever bridge adopts the method for controlling closure by synchronous pushing displacement of the T-shaped rigid frame cantilever bridge according to any one of claims 1 to 9.
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| CN202010872644.5A CN111962404A (en) | 2020-08-26 | 2020-08-26 | T-shaped rigid frame cantilever bridge synchronous pushing displacement control closure method and cantilever bridge |
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