CN113512946A - Deviation error control method for main tower of suspension bridge - Google Patents
Deviation error control method for main tower of suspension bridge Download PDFInfo
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- CN113512946A CN113512946A CN202110427966.3A CN202110427966A CN113512946A CN 113512946 A CN113512946 A CN 113512946A CN 202110427966 A CN202110427966 A CN 202110427966A CN 113512946 A CN113512946 A CN 113512946A
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- cable
- counterweight
- catwalk
- load
- deviation
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- 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
- E01D19/00—Structural or constructional details of bridges
- E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
Abstract
The invention discloses a method for controlling deviation errors of a main tower of a suspension bridge, which belongs to the technical field of bridge construction, wherein after catwalk modification and cable-carrying cranes are installed, a counterweight load is applied to a catwalk construction platform to ensure that the horizontal unbalance force F of the tower top is 0 and the deviation error Delta L of the main tower is 0 under the combined action of catwalk load, cable-carrying crane load and counterweight load, and the counterweight, the cable-carrying cranes and the catwalk are dismantled after the bridge is formed. By adopting the control method, the deviation error of the main tower in the bridge forming state can be controlled, and the construction quality of the bridge is ensured.
Description
Technical Field
The invention belongs to the technical field of bridge construction, and particularly relates to a deviation error control method for a main tower of a suspension bridge.
Background
At present, the construction control of the suspension bridge focuses on the stress-free manufacturing lengths of the main cable and the suspension cable and the line shapes of the main cable and the main beam, and the line shapes of the main tower are less concerned, so that the deviation error of the main tower is larger when most of the suspension bridges form the bridge. The main tower is used as a main pressure-bearing member, the tower top deviation error is large, the tower bottom pressure stress is not uniformly distributed, the safe storage of the main tower pressure stress is reduced, the stability of the main tower is reduced, and even the normal use of the bridge is influenced under the extreme load condition. Therefore, it is desirable to provide a method for controlling the deviation error of the main tower of the suspension bridge, which can control the deviation error of the main tower in the bridge-forming state.
Disclosure of Invention
In view of this, the present invention provides a method for controlling deviation error of a main tower of a suspension bridge, which can control deviation error of the main tower in a bridge forming state, and ensure construction quality of the bridge.
In order to achieve the purpose, the invention provides the following technical scheme:
after catwalk modification and cable-carried crane installation are completed, counterweight load is applied to a catwalk construction platform, so that tower top unbalance horizontal force F is 0 and main tower offset error delta L is 0 under the combined action of catwalk load, cable-carried crane load and counterweight load, and after a bridge is formed, the counterweight, cable-carried crane and catwalk are dismantled.
Further, the control method comprises the following steps:
(1) calculating a balance weight, namely calculating a main tower deviation delta L caused by catwalk load and cable-carried crane load in an empty cable state, and adjusting balance weight load concentration and a balance weight area through trial calculation to ensure that the tower top unbalance horizontal force F is 0 and the delta L is 0 under the combined action of catwalk load, cable-carried crane load and balance weight load;
(2) formulating a counterweight scheme;
(3) and monitoring the deviation of the main tower in the counterweight process.
Further, in the step (1), the counterweight calculation uses a finite element model to equate the catwalk dead weight to the node load acting on the main cable clamp, and equate the dead weights of the two midspan cable cranes to the node loads acting on the two cable clamps closest to the midspan, so as to calculate the main tower deviation Δ L.
Further, in the step (2), the counterweight scheme adopts a counterweight which has good integrity and is prevented from scattering, the whole catwalk working surface is uniformly paved in the transverse direction and the longitudinal direction during counterweight, and graded loading is carried out in regions according to the counterweight calculation result.
Further, in the step (3), the step of monitoring the deviation of the main tower in the process of balancing weight comprises the following steps: a. after the main cable is erected, the deviation L of the main tower is measured0(ii) a b. After catwalk hanging change is completed, cable crane installation is completed and the cable crane is moved to a midspan position, main tower deviation L is measured1(ii) a c. Carrying out graded loading according to the counterweight scheme in different regions, and measuring the deviation L of the main tower after each grade of loading2，L3，···，Li(ii) a d. The actual measurement deviation L of the main tower after the final stage of counterweight is finished is ensured by taking the actual measurement deviation of the main tower as a control targeti＝L0。
Furthermore, after the bridge is formed, the midspan cable crane is returned to the midspan position, then the counterweight and the cable crane are removed, and finally the catwalk is removed.
The invention has the beneficial effects that:
according to the method for controlling the deviation error of the main tower of the suspension bridge, after catwalk modification and cable-carried crane installation are completed, counterweight load is applied to a catwalk construction platform, so that the unbalanced horizontal force and deviation of the tower top under the combined action of catwalk load, cable-carried crane load and counterweight load are guaranteed to be equal to zero, the deviation error of the main tower in a bridge forming state caused by modification and removal of catwalks and installation and removal of cable-carried cranes is eliminated, and the construction quality of bridges is guaranteed.
Additional advantages, objects, and features of the invention will be set forth 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. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
In order to make the object, technical scheme and beneficial effect of the invention more clear, the invention provides the following drawings for explanation:
FIG. 1 is a schematic diagram of the deviation of catwalk changing and crane load generated on the tower top under the condition of no counterweight in an empty cable state;
FIG. 2 is a schematic diagram of an offset error generated at the top of a tower after a catwalk and a crane are dismantled in a bridge state;
fig. 3 is a schematic view of the counterweight in an empty cable state.
Detailed Description
Cause analysis: because the design of the suspension bridge catwalk construction platform and the main cable is calculated by adopting the catenary theory, and the horizontal forces of the construction platform and the main cable at the top of the tower are equal, the main tower cannot deviate in the process of erecting the catwalk construction platform and the main cable. When the main cable saddle is installed, the pre-deviation is set in advance on the tower top, and when the main tower deviates due to the hoisting of the stiffening beam and the subsequent second-stage constant-load construction, the main tower is reset through pushing. Theoretically, catwalk construction platform erection, main cable erection, stiffening beam hoisting and follow-up second-stage constant-load construction can not cause the main tower to generate deviation errors.
Before the hoisting construction of the stiffening beam, in order to adapt to the large displacement deformation of the main cable in the hoisting construction process of the stiffening beam, the catwalk needs to be hung on the main cable instead. The modified catwalk stress system does not accord with the catenary theory any more, the dead weight load of the modified catwalk stress system is equivalent to the node load acting on the main cable, and unbalanced horizontal force is generated at the tower top due to the fact that the dead weight load of the middle-side span catwalk is asymmetric. In addition, the cable crane is also installed before the hoisting construction of the stiffening beam, the dead load is equivalent to the node load acting on the main cable, and unbalanced horizontal force can be generated on the tower top under the condition that only the cable crane is arranged in the midspan or the cable crane is arranged in the midspan (the midspan is generally asymmetric in span).
As shown in fig. 1 to 2, assuming that an unbalanced horizontal force generated at the tower top by a catwalk modifying and installing a cable crane is F, and the thrust stiffness of the main tower in an empty cable state is K, an offset Δ L, that is, Δ L is F/K, is generated at the tower top. Because the main cable force under the bridge state is far greater than the main cable force under the empty cable state, the stiffening beam limiting device also changes the constraint state of the main tower, so that the thrust resistance rigidity K 'of the main tower under the bridge state is greatly changed, and K' is not equal to K. The catwalk and the cable crane are generally dismantled after the bridge is formed, and the dismantling process can be regarded as that horizontal force-F with equal magnitude and opposite direction is generated at the tower top, the generated tower top deviation delta L 'is-F/K', as K 'is not equal to K, the | delta L | ≠ delta L |, the main tower cannot be completely reset, and thus the tower top deviation error F is ═ delta L | - |, delta L' |. Therefore, the modification and the removal of the catwalk and the installation and the removal of the cable crane are main reasons of deviation errors of the main tower in the bridge forming state.
As shown in fig. 3, after catwalk modification and cable crane installation are completed, the method for controlling deviation error of main tower of suspension bridge according to the present invention applies counterweight load on catwalk construction platform to ensure that tower top unbalance horizontal force F is 0 and main tower deviation error Δ L is 0 under combined action of catwalk load, cable crane load and counterweight load, and then removes counterweight, cable crane and catwalk after forming bridge.
In this embodiment, the control method includes the following steps:
(1) calculating a balance weight, namely calculating a main tower deviation delta L caused by catwalk load and cable-carried crane load in an empty cable state, and adjusting balance weight load concentration and a balance weight area through trial calculation to ensure that the tower top unbalance horizontal force F is 0 and the delta L is 0 under the combined action of catwalk load, cable-carried crane load and balance weight load;
(2) formulating a counterweight scheme;
(3) and monitoring the deviation of the main tower in the counterweight process.
In this embodiment, in step (1), the counterweight calculation uses a finite element model to equate the catwalk deadweight to the node load acting on the main cable clamp, and equate the two midspan cable cranes deadweight to the node load acting on the two cable clamps closest to the midspan, so as to calculate the main tower deviation Δ L.
In this embodiment, in step (2), the counterweight scheme adopts a counterweight that has good integrity and prevents scattering, and when the counterweight is used, the whole catwalk working surface is uniformly paved along the transverse direction and the longitudinal direction, and graded loading is performed in regions according to the counterweight calculation result.
In this embodiment, in step (3), the step of monitoring the deviation of the main tower during the counterweight process includes: a. after the main cable is erected, the deviation L of the main tower is measured0(ii) a b. After catwalk hanging change is completed, cable crane installation is completed and the cable crane is moved to a midspan position, main tower deviation L is measured1(ii) a c. Carrying out graded loading according to the counterweight scheme in different regions, and measuring the deviation L of the main tower after each grade of loading2，L3，···，Li(ii) a d. The actual measurement deviation L of the main tower after the final stage of counterweight is finished is ensured by taking the actual measurement deviation of the main tower as a control targeti＝L0。
In this embodiment, after the bridge is formed, the midspan cable crane is first retracted to the midspan position, then the counterweight and the cable crane are removed, and finally the catwalk is removed.
The method for controlling the deviation error of the main tower of the suspension bridge is also suitable for a separated catwalk or a suspension bridge with a cable crane on a side span, the dead weight of the cable crane on the side span is equivalent to the node load acting on a cable clamp at the hoisting position of a stiffening girder on the side span during counterweight calculation, and a counterweight area is not limited to the side span and can be arranged in the middle span according to the actual condition (not shown in a schematic diagram); in addition, the method can also adjust the counterweight area and concentration to make the actual measurement deviation L of the main tower after counterweight is finishediAnd reaching a specific target value, and eliminating the deviation error of the main tower caused by construction errors before the stiffening girder is hoisted and realizing the optimal linear shape of the main tower in a bridge forming state.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (6)
1. A deviation error control method for a main tower of a suspension bridge is characterized by comprising the following steps: after catwalk modification and installation of the cable-carrying crane are completed, counterweight load is applied to a catwalk construction platform, the unbalanced horizontal force F of the tower top is 0 under the combined action of catwalk load, cable-carrying crane load and counterweight load, the deviation error delta L of the main tower is 0, and the counterweight, the cable-carrying crane and the catwalk are detached after a bridge is formed.
2. The method of claim 1, wherein: the control method comprises the following steps:
(1) calculating a balance weight, namely calculating a main tower deviation delta L caused by catwalk load and cable-carried crane load in an empty cable state, and adjusting balance weight load concentration and a balance weight area through trial calculation to ensure that the tower top unbalance horizontal force F is 0 and the delta L is 0 under the combined action of catwalk load, cable-carried crane load and balance weight load;
(2) formulating a counterweight scheme;
(3) and monitoring the deviation of the main tower in the counterweight process.
3. The method of claim 2, wherein: in the step (1), the counterweight calculation utilizes a finite element model to equate the dead weight of the catwalk to the node load acting on the main cable clamp, and equate the dead weights of the two midspan cable cranes to the node load acting on the two cable clamps closest to the midspan, so as to calculate the main tower deviation delta L.
4. The method of claim 2, wherein: in the step (2), the counterweight scheme adopts a counterweight which has good integrity and is prevented from scattering, the whole catwalk working surface is uniformly paved in the transverse direction and the longitudinal direction during counterweight, and graded loading is carried out in regions according to the counterweight calculation result.
5. A suspension cable according to claim 2The bridge main tower deviation error control method is characterized by comprising the following steps: in the step (3), the step of monitoring the deviation of the main tower in the process of balancing weight comprises the following steps: a. after the main cable is erected, the deviation L of the main tower is measured0(ii) a b. After catwalk hanging change is completed, cable crane installation is completed and the cable crane is moved to a midspan position, main tower deviation L is measured1(ii) a c. Carrying out graded loading according to the counterweight scheme in different regions, and measuring the deviation L of the main tower after each grade of loading2，L3，…，Li(ii) a d. The actual measurement deviation L of the main tower after the final stage of counterweight is finished is ensured by taking the actual measurement deviation of the main tower as a control targeti＝L0。
6. The method of claim 1, wherein: and after the bridge is formed, the midspan cable crane is returned to the midspan position, then the counterweight and the cable crane are removed, and finally the catwalk is removed.
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