Construction method of suspended splay cable sleeve of self-anchored suspension bridge

Abstract

The invention belongs to the technical field of bridge construction, and provides a construction method of a suspended splay cable sleeve of a self-anchored suspension bridge. A multi-layer opening and closing sliding rod structure is adopted to restrain the cable strands, the cable strands are prevented from being stretched upwards in the installation process, and the erecting precision of the cable strands can be improved; when a certain cable strand is installed, the sliding rod is opened in a rotating mode or slides horizontally, it is guaranteed that an installation channel of the cable strand is reserved, and erecting construction of the cable strand can be facilitated; and after one layer of cable strand is installed, the upper layer of sliding rod is started until all the cable strands are installed in place, and then the splay cable sleeve upper cover is installed. The construction method is easy to operate, high in efficiency and high in installation precision, the splay rope sling upper cover can be installed in one step, and repeated correction through a jack is not needed.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and relates to a construction method of a suspended loose cable sleeve of a self-anchored suspension bridge. Background Art

[0002] The main cable of a self-anchored suspension bridge is anchored at both ends of the main beam. In order to reduce the size of the anchor blocks at both ends of the main beam, a smaller loose cable sleeve is often used to replace the loose cable saddle. The appearance of the loose cable sleeve is similar to a cable clamp that opens and closes up and down. The front end fixes and clamps the main cable to form a circular main cable with a small porosity, and the rear end spreads the main cable strands in all directions at different angles. The spread strands pass through the cable tube and are anchored on the anchor pad. Unlike the loose cable saddle, the spread angle of some strands of the loose cable sleeve can be located above the central axis of the main cable, making it difficult to fix these strands during installation. The main construction methods currently used are: Li Aidi proposed the use of temporary traction wire in "Linear Control of Main Cable Under Suspended Loose Cable Sleeve of Self-anchored Suspension Bridge"; Zhao Dongli used a limit frame in "A Construction Method of Loose Cable Sleeve of Suspension Bridge". Although these temporary construction measures can temporarily fix the cables, the traction wires are concentrated at the bends of the cables, which conflicts with the dense positions of the cables. Large holes need to be opened in the main beams. The limit frame method can only be used to preliminarily position the cables during installation. When installing the loose cable cover, these temporary measures must be removed first. Once the temporary measures are removed, the originally positioned cable lines will be affected to a certain extent. After the loose cable cover is installed, the cables can be adjusted using a jack. Summary of the invention

[0003] The present invention provides a construction method for a suspended loose cable sleeve of a self-anchored suspension bridge. A multi-layer openable sliding rod structure is adopted. When installing the cable strand located above the central axis of the main cable, the sliding rod is rotated to open or slide to leave an installation channel for the cable strand. Each time a cable strand is installed, the sliding rod is used to press the cable strand to prevent it from stretching upward. When installing other cables of the same layer, the sliding rod can be opened or slid to leave a position to be installed for installation. The cables that have been installed in place are pressed by the sliding rod and cannot be stretched. After all cables of this layer are installed, the sliding rod of the upper layer is opened, and the above process is repeated until all cables are installed in place. Then only the sliding rod assembly of the highest layer is retained, the sliding rod assembly of the lower layer is removed, and the loose cable sleeve cover is installed, and finally the sliding rod assembly of the highest layer is removed.

[0004] The technical solution of the present invention:

[0005] A construction method for a suspended loose cable sleeve of a self-anchored suspension bridge, the steps are as follows:

[0006] A multi-layer sliding bar assembly 1 is used to constrain the cable strands and prevent them from being stretched upward during installation. When installing a certain cable strand, the sliding bar 2 is rotated to open or horizontally slid to ensure that an installation channel for the cable strand is reserved. After installation, the sliding bar 2 is used to press the cable strand in time. When installing other cable strands on the same layer, the sliding bar is rotated to open or horizontally slid to reserve a position for installation. The cable strands that have been installed in place are pressed by the sliding bar and cannot be stretched. After all the cable strands on this layer are installed, the sliding bar of the upper layer is opened, and the above process is repeated until all the cable strands are installed in place. Then, only the sliding bar assembly of the highest layer is retained, the sliding bar assembly of the lower layer is removed, and the loose cable cover 7 is installed, and finally the sliding bar assembly of the highest layer is removed.

[0007] A set of multi-layer opening and closing slide bar assemblies 1 is manufactured, including two sets of slide bars 2, a base 3, a column 4 and a fixing pin 5, wherein the base 3 of the highest layer is separated from the bases 3 of other layers; there are slide grooves on the slide bars 2, each slide bar 2 is fixed to the column 4 through two fixing pins 5, the lower column 4 is fixed to the lower saddle body 6 of the loose cable sleeve through the base 3, and the uppermost column 4 is fixed to the temporary support 10 through the base 3; the slide bar 2 can slide horizontally along the connecting line direction of the two fixing pins 5, and can also unlock one of the fixing pins 5 and rotate around the other fixing pin 5 to open the slide bar 2;

[0008] During construction, the lower saddle body 6 of the loose cable sleeve is first fixed to the anchor block 9 of the self-anchored suspension bridge through a temporary support 10 according to the angle required by the design, the base 3 of the slide bar assembly 1 is fixed to the lower saddle body 6 of the loose cable sleeve, and the base 3 of the highest layer is directly fixed to the temporary support 10; the cable strands 81 below the central axis of the main cable and the cable strands 82 above the central axis of the main cable must be installed layer by layer from bottom to top; the cable strands 81 below the central axis of the main cable are bent downward, and the installation line shape is easily guaranteed due to the constraint of the lower saddle body 6 of the loose cable sleeve; but when installing the cable strands 82 above the central axis of the main cable, since the rear end of the cable strands is bent upward after being spread out, if no constraint is applied, the cable strands 82 above the central axis of the main cable will be stretched upward, affecting the accuracy of its installation line shape, and also making the installation of the upper cover 7 of the loose cable sleeve very difficult; therefore, a set of multi-layer opening and closing slide bar assembly is adopted. 1, unlock one of the fixing pins 5, rotate and open the slide bar 2, or keep the two fixing pins 5, slide and remove the slide bar 2 horizontally, and leave an installation channel for the cable strand 82 above the central axis of the main cable. Each time a cable strand 82 above the central axis of the main cable is installed, the cable strand 82 above the central axis of the main cable is pressed by the horizontal sliding slide bar 2 to prevent it from stretching upward; when installing other cable strands on the same layer, the slide bar 2 can be rotated to open or slide horizontally to leave a position to be installed for installation, and the cable strands that have been installed in place are pressed by the slide bar 2 and cannot be stretched; after all the cable strands of this layer are installed, the slide bar 2 of the upper layer is started, and the above process is repeated until all the cable strands 82 above the central axis of the main cable are installed in place, and then only the highest layer of the slide bar assembly 1 is retained, the rest of the slide bar assembly 1 is removed, and then the loose cable cover 7 is installed, and finally the highest layer of the slide bar assembly 1 is removed.

[0009] The effects and benefits of the present invention are as follows: (1) a multi-layer sliding rod structure is adopted to constrain the cable strands above the center line of the main cable to prevent them from being stretched upward, which helps to improve the installation accuracy of the cable strands; (2) during the installation process, the sliding rod is rotated to open or horizontally slided to ensure that an installation channel for the cable strands is reserved, which can facilitate the installation of the cable strands; (3) after the installation of one layer of cable strands is completed, the sliding rod of the upper layer is started to perform the same operation, which is simple, easy and efficient; (4) after all the cable strands are installed in place, the loose cable sleeve cover is installed. Since the installation accuracy of all the cable strands is guaranteed, the loose cable sleeve cover can be installed in one step without the need for repeated correction by a jack. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is an elevation view of the construction method of a suspended loose cable sleeve for a self-anchored suspension bridge.

[0011] Figure 2 It is a cross-sectional view of the construction method of a suspended loose cable sleeve for a self-anchored suspension bridge.

[0012] Figure 3Schematic diagram of the cable strand installation process, where (a) is to open the first layer of the A group slide bar 2, install the 22# cable strand, and first press it with the B group slide bar 2; (b) use the A group slide bar 2 to press the 22# cable strand, remove the B group slide bar 2, and install the 23# cable strand; (c) first slide the B group slide bar 2 to the left and press it on the installed 22# cable strand, then slide the A group slide bar 2 to the left horizontally (or open) to leave an installation channel, and install the 21# cable strand; (d) use the A group slide bar 2 to press the 21#, 22#, and 23# cable strands, slide the B group slide bar 2 to the right horizontally, leave an installation channel, and install the 24# cable strand.

[0013] In the figure: 1-slide rod assembly; 2-slide rod; 3-base; 4-column; 5-fixing pin; 6-lower saddle of loose cable sleeve; 7-upper cover of loose cable sleeve; 81-cable strand below the central axis of the main cable; 82-cable strand above the central axis of the main cable; 9-anchor block; 10-temporary support. DETAILED DESCRIPTION

[0014] The specific implementation of the present invention is described in detail below in conjunction with the technical scheme and the accompanying drawings.

[0015] Example

[0016] like Figure 3As shown, the main cable of a self-anchored suspension bridge has 37 strands, of which 1# to 20# are strands 81 located below the central axis of the main cable, and 21# to 37# are strands 82 located above the central axis of the main cable. During construction, the lower saddle body 6 of the loose cable sleeve is first fixed to the anchor block 9 through a temporary support 10, and then the strands 81 located 1# to 20# below the central axis of the main cable are installed according to the conventional erection method; then the base 3 of the slide bar assembly 1 is fixed to the lower saddle body 6 of the loose cable sleeve, and the highest base 3 is directly fixed to the temporary support 10. Then, turn and open the A group slide bar 2 of the first layer, install the 22# cable strand, and press it with the B group slide bar 2 in time after adjusting the linear shape. Then, use the A group slide bar 2 to press the 22# cable strand, and remove the B group slide bar 2; install the 23# cable strand and press it with the B group slide bar 2; when installing the 21# cable strand, in order to prevent the installed 22# cable strand from being stretched upward, first slide the B group slide bar 2 to the left and press it on the installed 22# cable strand, and then slide the A group slide bar 2 to the left horizontally (or open) to leave an installation channel, install the 21# cable strand, and press it with the A group slide bar 2; when installing the 24# cable strand, in order to prevent the installed 21# and 2 The 2# and 23# cables are stretched upwards, and the A group slide bar 2 is first slid to the right and pressed on the already installed 21#, 22#, and 23# cables, and then the B group slide bar 2 is horizontally slid to the right to leave an installation channel, and the 24# cable is installed and pressed with the B group slide bar 2; after the installation of the 21#, 22#, 23#, and 24# cables of the first layer is completed, the upper layer slide bar 2 is opened, and the operation of the first layer is repeated. Each layer of cable strands 82 is installed from the inside to the outside. It should be noted that when the first layer slide bar 2 blocks the installation of the second layer of cable strands 82, the A group slide bar 2 or the B group slide bar 2 of the first layer can be horizontally slid to make way for the installation channel. Repeat the above process until all the cables 82 are installed in place, and then only the highest layer of the slide bar assembly 1 is retained, the lower layer of the slide bar assembly 1 is removed, and then the loose cable cover 7 is installed, and finally the highest layer of the slide bar assembly 1 is removed.

Claims

1. A construction method for a suspended loose cable sleeve of a self-anchored suspension bridge, characterized in that: Here are the steps: A multi-layer sliding bar assembly (1) is used to constrain the cable strands and prevent them from being stretched upward during the installation process. When installing a certain cable strand, the sliding bar (2) is rotated to open or horizontally slid to ensure that an installation channel for the cable strand is reserved. After installation, the sliding bar (2) is used to press the cable strand in time. When installing other cable strands on the same layer, the sliding bar is rotated to open or horizontally slid to reserve a position to be installed for installation. The cable strands that have been installed in place are pressed by the sliding bar and cannot be stretched. After all the cable strands on the layer are installed, the sliding bar of the upper layer is opened, and the above process is repeated until all the cable strands are installed in place, and then only the sliding bar assembly of the highest layer is retained, the sliding bar assembly of the lower layer is removed, and then the loose cable sleeve cover (7) is installed, and finally the sliding bar assembly of the highest layer is removed.

2. The construction method of the suspended loose cable sleeve of the self-anchored suspension bridge according to claim 1 is characterized in that: The multi-layer opening and closing slide bar assembly (1) comprises two groups of slide bars (2), a base (3), a column (4) and a fixing pin (5), wherein the base (3) of the highest layer is separated from the bases (3) of other layers; a slide groove is provided on the slide bar (2), each slide bar (2) is fixed to the column (4) through two fixing pins (5), the column (4) of the lower layer is fixed to the saddle body (6) under the loose cable sleeve through the base (3), and the column (4) of the highest layer is fixed to the temporary support (10) through the base (3); the slide bar (2) can slide horizontally along the connecting line direction of the two fixing pins (5), and can also unlock one of the fixing pins (5) and rotate around the other fixing pin (5) to open the slide bar (2).

3. The construction method of the suspended loose cable sleeve of the self-anchored suspension bridge according to claim 2 is characterized in that: During construction, the lower saddle body (6) of the loose cable sleeve is first fixed to the anchor block (9) of the self-anchored suspension bridge through a temporary support (10) according to the angle required by the design, the base (3) of the slide bar assembly (1) is fixed to the lower saddle body (6) of the loose cable sleeve, and the base (3) of the highest layer is directly fixed to the temporary support (10); the cable strands (81) below the central axis of the main cable and the cable strands (82) above the central axis of the main cable must be installed one by one from bottom to top layer by layer; the cable strands (81) located at the central axis of the main cable must be installed one by one from bottom to top layer by layer; the cable strands (82) located at ... The cable strands (81) below the main cable are bent downwards, and due to the constraints of the lower saddle body (6) of the loose cable sleeve, the installation line shape is easily guaranteed; however, when installing the cable strands (82) above the central axis of the main cable, since the rear end of the cable strands bends upwards after being spread out, if no constraints are applied, the cable strands (82) above the central axis of the main cable will be stretched upwards, affecting the accuracy of its installation line shape, and also making the installation of the loose cable sleeve cover (7) very difficult; therefore, a set of multi-layer opening and closing slide bar assemblies (1) is used, by unlocking one of the fixing pins (5), rotating to open the slide bar (2), or retaining two fixing pins (5), horizontally sliding and moving the slide bar (2), leaving an installation channel for the cable strands (82) above the central axis of the main cable, each time a cable strand (82) above the central axis of the main cable is installed, the cable strand (82) above the central axis of the main cable is pressed by means of a horizontal sliding slide bar (2) to prevent it from stretching upwards; when installing other cable strands on the same layer, the cable strands (82) above the central axis of the main cable can be opened or closed by rotating. The slide bar (2) is slid horizontally to leave a position to be installed for installation. The cables that have been installed in place are pressed by the slide bar (2) and cannot be stretched. After all cables of this layer are installed, the slide bar (2) of the previous layer is started, and the above process is repeated until all cables (82) above the central axis of the main cable are installed in place. Then only the top layer of the slide bar assembly (1) is retained, the rest of the slide bar assembly (1) is removed, and the loose cable cover (7) is installed. Finally, the top layer of the slide bar assembly (1) is removed.

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