WO2023173588A1

WO2023173588A1 - Construction method for splay cable sleeve of suspension bridge

Info

Publication number: WO2023173588A1
Application number: PCT/CN2022/095283
Authority: WO
Inventors: 赵东黎; 梁辉; 李桐; 朱东明; 付小莲; 张园华; 任华焘; 周辉; 徐新学; 龚士平; 焦剑英; 黄剑宇; 郭文晔
Original assignee: 中铁九桥工程有限公司; 中铁高新工业股份有限公司
Priority date: 2022-03-16
Filing date: 2022-05-26
Publication date: 2023-09-21
Also published as: CN114941288B; CN114941288A

Abstract

A construction method for a splay cable sleeve of a suspension bridge. The method comprises: mounting a splay cable sleeve lower saddle body (6); mounting limiting constraint frames (1) at the front end and the rear end of the splay cable sleeve lower saddle body (6), a cable saddle IP point, and a midpoint position between the cable saddle IP point and the rear end; erecting a main cable, and carrying out initial positioning by means of the splay cable sleeve lower saddle body (6) and the limiting constraint frames (1); tightening the transverse diameter of the main cable after the main cable is totally erected; removing the limiting constraint frames (1) at the cable saddle IP point and the midpoint position between the cable saddle IP point and the rear end; and mounting a splay cable sleeve upper saddle body (5) on the splay cable sleeve lower saddle body (6), such that a clearance rate of the splay cable sleeve upper saddle body (5) and the splay cable sleeve lower saddle body (6) reach a standard. When and after the main cable is put into a saddle, the transverse diameter thereof is limited, such that the interference on the assembly of the splay cable sleeve upper saddle body (5) and the splay cable sleeve lower saddle body (6) can be avoided. Therefore, it is ensured that the splay cable sleeve upper saddle body (5) is mounted precisely and smoothly, and the mounting efficiency of a splay cable sleeve is improved.

Description

A kind of construction method of loose cable sleeves for suspension bridges

Technical field

The present invention relates to the technical field of bridge erection, and specifically to a construction method of loose cable sets for a suspension bridge.

Background technique

With the development of bridges, suspension bridges are increasingly used. As one of the important force transmission structures of the suspension bridge, the installation accuracy of the loose cable sleeve has a great influence on the overall linear shape of the main cable, which directly affects the stress of the entire bridge.

The sling sling is in the shape of a trumpet as a whole, and is assembled from the upper saddle body of the sling sling and the lower saddle body of the sling sling. Since the loose rope sleeve has a certain length, there is upward and outward tension when the main cable strands are inserted into the saddle, which inevitably leads to the enlargement of the main cable's transverse diameter. The existing construction methods of loose rope casings mostly use steel plate lattice structures to restrain the diverging main cable strands. However, this method is difficult to restrain the main cable strands, making it difficult to assemble the upper saddle body of the loose rope casing and the lower saddle body of the loose rope casing; and Even if the installation of the loose sling is forcibly completed, most of it will cause the main cable type to not meet the requirements, requiring multiple adjustments, causing inconvenience.

Contents of the invention

In view of the above problems, the present invention provides a construction method of loose cable sleeves for a suspension bridge to solve one of the above problems.

In order to achieve the above objectives, the construction method of loose cable sleeves for suspension bridges of the present invention includes:

Install the lower saddle body of the loose rope sleeve;

Limiting restraint frames are installed at the front end, rear end of the lower saddle body of the loose rope casing, the IP point of the cable saddle, and the midpoint between the IP point of the cable saddle and the rear end;

Set up the main cable and preliminarily position it through the lower saddle body of the loose rope sleeve and the limiting restraint frame;

After all the main cables are erected, tighten the transverse diameter of the main cables;

Remove the cable saddle IP point and the limiting restraint frame at the midpoint between the cable saddle IP point and the rear end;

The upper saddle body of the loose rope cover is installed on the lower saddle body of the loose rope cover, and the clearance rate between the upper saddle body of the loose rope cover and the lower saddle body of the loose rope cover reaches the standard.

Optionally, the installation of the lower saddle body of the loose rope sleeve includes:

Pour the concrete foundation and embed the embedded parts with embedded parts slots for loose cable sets;

Install the lower saddle body of the loose rope casing into the groove of the embedded parts of the loose rope casing, with the slope being the same as the slope of the loose rope casing when forming a bridge; and arrange a limit in the groove of the embedded parts of the loose rope casing Stopper to restrict the lower saddle body of the loose rope sleeve from sliding in the groove of the embedded part of the loose rope sleeve.

Optionally, tightening the transverse diameter of the main cable includes:

Tighten the transverse diameters of the main cables on the side span side and the main cables on the anchor span side;

When the cable saddle IP point and the limiting restraint frame at the midpoint between the cable saddle IP point and the rear end are not separated from the main cable, install a tightening system;

The transverse diameter of the main cable is tightened by the tightening system until the IP point of the cable saddle and the limiting restraint frame and the main cable are located at the midpoint between the IP point of the cable saddle and the rear end. Detach.

Optionally, the jacking system includes a reverse frame and a plurality of jacks, and installing the jacking system includes:

Install the reverse rack;

A plurality of the jacks are arranged on the reverse frame at intervals along the length direction of the lower saddle body of the loose rope sleeve to tighten the main cable.

Optionally, the transverse diameter of the main cable is tightened by the tightening system until the cable saddle IP point and the limiting restraint frame at the midpoint between the cable saddle IP point and the rear end are The main cable detachment includes:

Along the direction from the side span of the suspension bridge to the anchor span, first start a part of the jacks to exert force on the main cable, and then start a part of the jacks to exert force on the main cable;

Repeat the above steps until the cable saddle IP point and the limiting restraint frame at the midpoint between the cable saddle IP point and the rear end are separated from the main cable.

Optionally, the transverse diameters of the main cables on the tightening side span side and the main cables on the anchor span side include:

Install tighteners on the main cables on the side span side and the main cables on the anchor span side;

The tightener is stretched according to preset rules until the transverse diameters of the main cables on the edge span side and the main cables on the anchor span side meet the design requirements.

Optionally, the tensioning of the tightener according to preset rules includes:

The upper row of tie rods and the lower row of tie rods of the tightener are synchronously stretched multiple times, and the force value increases each time.

Optionally, the step of installing the upper saddle body of the loose rope casing on the lower saddle body of the loose rope casing, and making the gap ratio between the upper saddle body of the loose rope casing and the lower saddle body of the loose rope casing meet the standard includes: :

Install a pull-down system, and gradually pull down the upper saddle body of the loose rope sleeve to the preset position through the pull-down system;

Remove the tightening system and adjust the distance between the upper saddle body of the loose rope casing and the lower saddle body of the loose rope casing until the gap between the upper saddle body of the loose rope casing and the lower saddle body of the loose rope casing is The rate meets the target.

Optionally, the pull-down system includes a plurality of first pull rods and a through-hole jack matching the first pull rods;

The installation of the pull-down system and the step-by-step pull-down of the upper saddle body of the loose rope sleeve to the preset position through the pull-down system include:

Install a plurality of first pull rods; the plurality of first pull rods are arranged symmetrically with respect to the center line of the main cable and penetrated through the upper saddle body of the loose rope sleeve and the lower saddle body of the loose rope sleeve; the third One end of a pull rod is limited to the lower saddle body of the loose rope sleeve, and the other end is installed in conjunction with the through-hole jack;

The first tension rod is stretched by the through-hole jack to realize the pull-down of the upper saddle body of the loose rope sleeve; during the process of pulling down the upper saddle body of the loose rope sleeve, multiple installations are carried out in stages. a second pull rod, the second pull rod is passed through the upper saddle body of the loose rope sleeve and the lower saddle body of the loose rope sleeve and limits the position;

Remove the pull-down system, and install and limit the second pull rod at the position where the first pull rod is removed from the upper saddle body of the loose lanyard and the lower saddle body of the loose lanyard;

Tighten all the second tie rods until the upper saddle body of the loose rope sleeve is pulled down to the preset position.

Optionally, the stepwise installation of multiple second tie rods includes:

When the upper saddle body of the loose rope sleeve is pulled down to a position where the second pull rod can be installed, the third saddle body is installed on one end of the upper saddle body of the loose rope sleeve and the lower saddle body of the loose rope sleeve toward the side span of the suspension bridge. Two tie rods;

When the upper saddle body of the loose rope set is pulled down to collide with the top cone located at the first area of the upper saddle body of the loose rope set, the upper saddle body of the loose rope set and the lower saddle body of the loose rope set face toward The second tie rod is installed at one end of the anchor span of the suspension bridge;

When the upper saddle body of the loose rope casing is pulled down to conflict with the top cone located at the second area of the top cone of the upper saddle body of the loose rope casing, the upper saddle body of the loose rope casing and the lower saddle of the loose rope casing The second tie rod is installed in the middle part of the body; wherein, along the direction from the side span of the suspension bridge to the anchor span, the first area and the second area are arranged in sequence.

Compared with the existing technology, the beneficial effects of the present invention are:

When installing the loose rope casing, first install the lower saddle body of the loose rope casing, and install the limit restraint frame at the front end, rear end of the lower saddle body of the loose rope lanyard, the IP point of the cable saddle, and the midpoint between the IP point of the cable saddle and the rear end. ; Then set up the main cable, and initially position it through the lower saddle body of the loose rope sleeve and the limit restraint frame. This can be regarded as the first transverse diameter limit of the main cable; after the main cable is fully erected, tighten the main cable The transverse diameter can be regarded as the second transverse diameter limit of the main cable; at this time, due to the second transverse diameter limit of the main cable, the cable saddle IP point and the midpoint between the cable saddle IP point and the rear end can be removed position of the limit restraint to avoid interfering with the installation of the upper saddle body of the loose rope sleeve; then install the upper saddle body of the loose rope sleeve on the lower saddle body of the loose rope sleeve, and make the upper saddle body of the loose rope sleeve and the lower saddle body of the loose rope sleeve The gap rate reached the standard, and the construction of the loose rope casing was finally completed. The invention limits the transverse diameter when and after the main cable is inserted into the saddle, which can avoid interfering with the assembly of the upper saddle body of the loose rope sleeve and the lower saddle body of the loose rope sleeve, and ensures the accurate and smooth installation of the upper saddle body of the loose rope sleeve. Improved the installation efficiency of loose slings.

Description of the drawings

Figure 1 is a schematic flow diagram of an embodiment of the construction method of loose cable sleeves for suspension bridges in the present invention;

Figure 2 is a schematic structural diagram of an embodiment of the position-limiting restraint frame of the present invention;

Figure 3 is a schematic structural diagram of an embodiment of the clamping system in the present invention;

Figure 4 is a schematic structural diagram of an embodiment of the lower saddle body of the loose rope lanyard according to the present invention;

Figure 5 is a schematic diagram of the assembly of the upper saddle body of the loose rope cover and the lower saddle body of the loose rope cover according to the present invention.

Explanation of reference symbols:

1. Limiting restraint frame; 11. Limiting steel plate; 12. Steel bracket; 2. Pier mast; 3. Reverse frame; 31. Cross beam; 32. Support beam; 33. First diagonal brace; 34. Back Beam; 4. Jack; 5. Upper saddle body of loose rope sleeve; 6. Lower saddle body of loose rope sleeve; 61. Slotted structure; 7. Second tie rod.

Detailed ways

In order to make the above objects, features and advantages of the present invention more obvious and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

What needs to be understood is that in the bridge construction industry, loose cable sleeves mainly play the role of dispersing the main cable strands to facilitate the anchoring of the main cable; the IP point of the cable saddle is the intersection position of the center line of the main cable in the cable saddle.

As shown in Figure 1, the construction method of loose cable sleeves for suspension bridges according to the embodiment of the present invention includes the following steps:

S100, install the lower saddle body 6 of the loose rope sleeve;

S200. Install the limit restraint frame 1 on the front end, rear end of the lower saddle body 6 of the loose rope sleeve, the IP point of the cable saddle, and the midpoint between the IP point of the cable saddle and the rear end;

S300. Set up the main cable and preliminarily position it through the lower saddle body 6 of the loose rope sleeve and the limit restraint frame 1;

S400. After all the main cables are installed, tighten the transverse diameter of the main cables;

S500. Remove the cable saddle IP point and the limit restraint frame 1 at the midpoint between the cable saddle IP point and the rear end;

S600. Install the upper saddle body 5 of the loose rope sleeve on the lower saddle body 6 of the loose rope sleeve, and make the gap rate between the upper saddle body 5 of the loose rope sleeve and the lower saddle body 6 of the loose rope sleeve meet the standard.

Using the construction method of the loose cable casing of the suspension bridge of this embodiment, when installing the loose cable casing, the lower saddle body 6 of the loose cable casing is first installed, and the front end, rear end, cable saddle IP point and cable casing of the lower saddle body 6 of the loose cable casing are installed. Install the limit restraint frame 1 at the midpoint between the saddle IP point and the rear end; then set up the main cable, and preliminary position it through the lower saddle body 6 of the loose rope sleeve and the limit restraint frame 1. This can be regarded as the first horizontal movement of the main cable. diameter limit; after all the main cables are erected, tighten the transverse diameter of the main cable, which can be regarded as the second transverse diameter limit of the main cable; at this time, due to the second transverse diameter limit of the main cable , the cable saddle IP point and the limit restraint frame 1 at the midpoint between the cable saddle IP point and the rear end can be removed to avoid interfering with the installation of the loose rope sleeve upper saddle body 5; then install the loose rope sleeve upper saddle body 5 on the loose rope sleeve Lower saddle body 6, and make the gap ratio between the upper saddle body 5 of the loose rope casing and the lower saddle body 6 of the loose rope casing reach the standard, and finally complete the construction of the loose rope casing. The present invention limits the transverse diameter when and after the main cable is inserted into the saddle, which can avoid interfering with the assembly of the upper saddle body 5 of the loose rope casing and the lower saddle body 6 of the loose rope casing, and ensures the accuracy of the upper saddle body 5 of the loose rope casing Smooth installation improves the installation efficiency of loose slings.

Optionally, in step S100, the following steps are included:

S101. Pour the concrete foundation and embed the embedded parts with embedded parts slots for loose cable sets;

S102. Install the lower saddle body 6 of the loose rope casing into the embedded part groove of the loose rope casing. The slope is the same as the slope of the loose rope casing when the bridge is formed; and arrange a limit stop in the embedded part groove of the loose rope casing. To restrict the lower saddle body 6 of the loose lanyard from sliding in the embedded groove of the loose lanyard.

In this embodiment, in step S101, the embedded parts of the anchor pier gantry 2 need to be pre-embedded in order to install the anchor pier gantry 2, which can be used for the upper saddle body 5 of the loose rope sleeve and the lower saddle of the loose rope sleeve. Body 6 hoisting, translation and positioning and other processes.

Optionally, in step S200, as shown in Figure 2, the limit restraint frame 1 includes a limit steel plate 11 and a profile steel bracket 12. The profile steel bracket 12 is used to connect the anchor pier mast 2, and the two limit steel plates 11 The intervals are arranged on the steel bracket 12. The limit steel plate 11 is a 1/4 arc steel plate. The aperture of the arc should be processed to be 5mm smaller than the radius R of the inner opening of the loose rope casing section, and the two arc steel plates should be reserved in the middle just above the lower saddle body 6 of the loose rope casing. The opening is 60mm wider than the diameter d of a single main cable strand. On the one hand, it can facilitate the entry of the main cable strand into the anchor. On the other hand, it can limit the transverse diameter of the main cable strand and control the porosity of the entire main cable.

Since the main cable includes a large number of main cable strands, some of the main cable strands have large vertical angles; and the loose rope sleeve is in the form of a bell mouth, with no saddle groove inside and a smooth inner wall. A limit restraint frame 1 is used at the front end, rear end of the lower saddle body 6 of the loose rope casing, the cable saddle IP point and the midpoint between the cable saddle IP point and the rear end, which can better constrain the arrangement of the main cable strands in the loose rope casing. cloth to avoid stringing and drumming between the main cable strands, and reduce the gaps between the main cable strands to facilitate the installation of the saddle body 5 on the subsequent loose rope sleeves.

At the same time, before the main cable strand enters the lower saddle body of the loose rope sleeve, two layers of transparent tape are wrapped at the contact point between the arc steel plate and the main cable strand to prevent the main cable strand from being scratched.

Optionally, in step S400, tightening the transverse diameter of the main cable includes:

S401. Tighten the cross diameter of the main cable on the side span side and the main cable on the anchor span side;

S402. When the cable saddle IP point and the limit restraint frame 1 at the midpoint of the cable saddle IP point and the rear end are not separated from the main cable, install the tightening system;

S403. Tighten the transverse diameter of the main cable through the tightening system until the cable saddle IP point and the limit restraint frame 1 at the midpoint of the cable saddle IP point and the rear end are separated from the main cable.

What needs to be understood is that during the erection process of the main cable strands, the vertical component force and the transverse horizontal component force generated by the main cable strands turning downward cause the main cable strands to have a tendency to expand the transverse diameter. In order to overcome the lateral horizontal component force near the cable saddle IP point, the front and rear ends of the main cable are clamped to reduce the transverse diameter, thereby reducing the lateral horizontal component force near the cable saddle IP point and ensuring smooth subsequent tightening work.

In this embodiment, step S401 includes: installing a tightener on the main cable on the side span side and the main cable on the anchor span side; tensioning the tightener according to preset rules until the main cable on the side span side and the anchor span side The transverse diameter of the main cable meets the design requirements.

Among them, tensioning the tightener according to the preset rules includes: synchronously applying force to the upper row of tie rods and the lower row of tie rods of the tightener multiple times, and the force value increases each time.

Specifically, the tightener consists of two sets of clamping components. Both sets of clamping components are pierced by 2 rows of 3 φ25mm precision-rolled threads, and are pulled by a hydraulic through-hole jack, from 20% → 40% → 60% →80%→100%, each level increases by 20%, and the maximum side span side clamping load is 30.5t. Before the tightener is installed, the main cable needs to be temporarily protected, and a rubber pad is used at the clamping position to prevent the main cable from being pinched. During the clamping process, the main cable needs to be observed. If the main cable is damaged, the load must be unloaded immediately, and the change in the transverse diameter of the main cable must be observed until the transverse diameter of the main cable meets the requirements after tensioning.

After step S401, it also includes: using calipers to clamp the main cable protective steel belt and installing temporary auxiliary cable clamps.

Among them, the temporary auxiliary cable clamp is the permanent cable clamp of the bridge. The temporary auxiliary cable clamp is located between the tightener on the side span side and the loose rope sleeve. It is installed after the tightener on the side span side tightens the main cable. The loose rope sleeve After the upper saddle body 5 is installed in place, it is removed and transferred to the permanent cable clamp position.

In step S402, the jacking system includes a reverse frame 3 and multiple jacks 4. Installing the jacking system includes: installing the reverse frame 3; and arranging multiple jacks 4 at intervals along the length direction of the lower saddle body 6 of the loose rope casing. On the reverse frame 3, tighten the main cable.

Among them, as shown in Figure 3, the entire reaction frame is vertical to the bottom surface of the loose rope sleeve, and includes a cross beam 31, a support beam 32, a back beam 34, a first diagonal brace 33 and a second diagonal brace. Two support beams 32 The upper ends of the two support beams 32 are connected by cross beams 31. Each support beam 32 is provided with a first diagonal brace 33 and a second diagonal brace. The first diagonal brace 33 is provided on the end surfaces of the two support beams 32 that are away from each other for connecting with the support piers. The top-rotating cable saddle is connected, and the second diagonal brace is provided for fixing with the side wall of the loose cable saddle pier. A back beam 34 is provided at the lower end of the end surface of each support beam 32 that is away from each other. The two back beams 34 are formed into a pair of pulleys through precision-rolled threaded rods.

It should be noted that before the construction of the beam 31, the upper saddle body 5 of the loose rope sleeve needs to be placed above the lower saddle body 6 of the loose rope sleeve to prevent the upper saddle body 5 of the loose rope sleeve from being unable to be in place after the connection of the cross beam 31 is completed. The beam 31 is welded as a whole. After completion, the loose rope can be put on the saddle body 5 and hung on the cross beam 31 for installation and lowering.

In this embodiment, along the side span of the suspension bridge in the direction of the anchor span, as shown in Figures 4 and 5, the lower saddle body 6 of the loose rope sleeve is provided with two slotted structures 61 at intervals; the upper saddle body 5 of the loose rope sleeve is provided at intervals. There are two protruding structures, and the two protruding structures and the two slotted structures 61 are arranged in cooperation. The jacks 4 of the tightening system tighten the main cable from the two slotted structures 61 and from the middle of the two slotted structures 61 respectively.

In this embodiment, step S403 includes:

Along the direction of the suspension bridge side span to the anchor span, first start some 4 jacks to exert force on the main cable, and then start some 4 jacks to exert force on the main cable;

Repeat the above steps until the cable saddle IP point and the limit restraint frame 1 at the midpoint between the cable saddle IP point and the rear end are separated from the main cable.

Specifically, the tightening operation sequence is gradually carried out from the suspension bridge side span to the anchor span. First, start the jack 4 at the first slotted structure 61, preload it to 25% of the design load (50t), and then start the first slotted structure. Jack 4 between structure 61 and the second slotted structure 61, to 12.5% of the design load (50t), observe the cable saddle IP point and the limit restraint frame 1 at the midpoint between the cable saddle IP point and the rear end. Whether it is detached from the main cable, if not, the side span shall be loaded and tightened according to 10% and the anchor span shall be 5% until the cable saddle IP point and the limit restraint frame 1 at the midpoint of the cable saddle IP point and the rear end. Detached from the main cable.

In this embodiment, step S600 includes the following steps:

S601. Install the pull-down system, and gradually pull down the saddle body 5 of the loose rope sleeve to the preset position through the pull-down system;

S602. Remove the tightening system and adjust the distance between the upper saddle body 5 of the loose rope casing and the lower saddle body 6 of the loose rope casing until the gap rate between the upper saddle body 5 and the lower saddle body 6 of the loose rope casing reaches the standard.

In this embodiment, the pull-down system includes a plurality of first pull rods and a through-hole jack matching the first pull rods; step S601 includes:

Install a plurality of first pull rods; the plurality of first pull rods are arranged symmetrically with respect to the center line of the main cable and penetrate the upper saddle body 5 of the loose rope sleeve and the lower saddle body 6 of the loose rope sleeve; one end of the first pull rod is limited to the loose rope Put down the saddle body 6, and install the other end with the through-hole jack;

The first tension rod is stretched by a through-hole jack to realize the pull-down of the upper saddle body 5 of the loose rope sleeve; during the pull-down process of the upper saddle body 5 of the loose rope sleeve, multiple second tension rods 7 are gradually installed in stages. The two tie rods 7 are passed through the upper saddle body 5 of the loose rope casing and the lower saddle body 6 of the loose rope casing and are limited in position;

Remove the pull-down system, and install the second tie rod 7 at the position where the first tie rod is removed from the upper saddle body 5 of the loose rope casing and the lower saddle body 6 of the loose rope hood and limit the position;

Tighten all the second tie rods 7 until the saddle body 5 of the loose rope sleeve is pulled down to the preset position.

Optionally, the stepwise installation of the plurality of second tie rods 7 includes: the stepwise installation of the plurality of second tie rods 7 includes: when the saddle body 5 of the loose rope sleeve is pulled down to a position where the second tie rod 7 can be installed, the stepwise installation of the plurality of second tie rods 7 includes: The second tie rod 7 is installed at one end of the suspension bridge side span on the upper saddle body 5 of the loose rope sleeve and the lower saddle body 6 of the loose rope sleeve; the upper saddle body 5 of the loose rope sleeve is pulled down to the first area of the lower saddle body 6 of the loose rope sleeve. When the top cone conflicts, a second tie rod 7 is installed on one end of the loose rope casing upper saddle body 5 and the loose rope casing lower saddle body 6 toward the anchor span of the suspension bridge; the loose rope casing upper saddle body 5 is pulled down to be in contact with the loose rope casing lower saddle. When the top cone at the second area of the body 6 conflicts, install the second tie rod 7 in the middle part of the upper saddle body 5 of the loose rope sleeve and the lower saddle body 6 of the loose rope sleeve; wherein, along the direction of the side span of the suspension bridge to the anchor span On the top, the first area and the second area are set in sequence.

Specifically, the first area is where the lower saddle body 6 of the loose rope cover faces the slotted structure 61 of the side span of the suspension bridge, and the second area is the position between the two slotted structures 61 of the lower saddle body 6 of the loose rope cover.

At the same time, during the third pull-down process, if there is a large resistance, it is necessary to observe whether there is any wire clamping. If there is no wire clamping, add a jack to pull down. During the pull-down process, the nut matching the second pull rod needs to be tightened.

The reader will understand that in the description of this specification, reference to the description of the terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" is intended to be described in connection with the embodiment or example. The specific features, structures, materials, or characteristics of are included in at least one embodiment or example of the invention. In this specification, the schematic expressions of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification unless they are inconsistent with each other.

Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will fall within the protection scope of the present invention.

Claims

A method for constructing loose cable sets for a suspension bridge, which is characterized by including:

Install the lower saddle body of the loose rope sleeve;

Limiting restraint frames are installed at the front end, rear end of the lower saddle body of the loose rope casing, the IP point of the cable saddle, and the midpoint between the IP point of the cable saddle and the rear end;

Set up the main cable and preliminarily position it through the lower saddle body of the loose rope sleeve and the limiting restraint frame;

After all the main cables are erected, tighten the transverse diameter of the main cables;

Remove the cable saddle IP point and the limiting restraint frame at the midpoint between the cable saddle IP point and the rear end;

The upper saddle body of the loose rope cover is installed on the lower saddle body of the loose rope cover, and the clearance rate between the upper saddle body of the loose rope cover and the lower saddle body of the loose rope cover reaches the standard.
The construction method of the loose cable casing of a suspension bridge according to claim 1, wherein the installation of the lower saddle body of the loose cable casing includes:

Pour the concrete foundation and embed the embedded parts with embedded parts slots for loose cable sets;

Install the lower saddle body of the loose rope casing into the groove of the embedded parts of the loose rope casing, with the slope being the same as the slope of the loose rope casing when forming a bridge; and arrange a limiter in the groove of the embedded parts of the loose rope casing Stopper to restrict the lower saddle body of the loose rope sleeve from sliding in the groove of the embedded part of the loose rope sleeve.
The construction method of loose cable sleeves for a suspension bridge according to claim 1, wherein the tightening of the transverse diameter of the main cable includes:

Tighten the transverse diameters of the main cables on the side span side and the main cables on the anchor span side;

When the cable saddle IP point and the limiting restraint frame at the midpoint between the cable saddle IP point and the rear end are not separated from the main cable, install a tightening system;

The transverse diameter of the main cable is tightened by the tightening system until the IP point of the cable saddle and the limiting restraint frame and the main cable are located at the midpoint between the IP point of the cable saddle and the rear end. Detach.
The construction method of loose cable sleeves for a suspension bridge according to claim 3, wherein the tightening system includes a reverse frame and a plurality of jacks, and the installation of the tightening system includes:

Install the reverse rack;

A plurality of the jacks are arranged on the reverse frame at intervals along the length direction of the lower saddle body of the loose rope sleeve to tighten the main cable.
The construction method of loose cable sleeves for a suspension bridge according to claim 4, characterized in that the transverse diameter of the main cable is tightened by the tightening system until the IP point of the cable saddle and the IP point of the cable saddle are connected to the The separation of the limiting restraint frame at the midpoint position of the rear end from the main cable includes:

Along the direction from the side span of the suspension bridge to the anchor span, first start a part of the jacks to exert force on the main cable, and then start a part of the jacks to exert force on the main cable;

Repeat the above steps until the cable saddle IP point and the limiting restraint frame at the midpoint between the cable saddle IP point and the rear end are separated from the main cable.
The construction method of loose cable sleeves for a suspension bridge according to claim 3, characterized in that the transverse diameters of the main cables on the tightening side span side and the main cables on the anchor span side include:

Install tighteners on the main cables on the side span side and the main cables on the anchor span side;

The tightener is stretched according to preset rules until the transverse diameters of the main cables on the edge span side and the main cables on the anchor span side meet the design requirements.
The construction method of loose cable sleeves for a suspension bridge according to claim 6, wherein the tensioning of the tightener according to preset rules includes:

The upper row of tie rods and the lower row of tie rods of the tightener are synchronously stretched multiple times, and the force value increases each time.
The construction method of the loose cable casing of the suspension bridge according to claim 1, wherein the upper saddle body of the loose cable casing is installed on the lower saddle body of the loose cable casing, and the upper saddle body of the loose cable casing is The gap rate of the lower saddle body of the loose rope sleeve reaches the standard including:

Install a pull-down system, and gradually pull down the upper saddle body of the loose rope sleeve to the preset position through the pull-down system;

Remove the tightening system and adjust the distance between the upper saddle body of the loose rope casing and the lower saddle body of the loose rope casing until the gap between the upper saddle body of the loose rope casing and the lower saddle body of the loose rope casing is The rate meets the target.
The construction method of loose cable sleeves for a suspension bridge according to claim 8, wherein the pull-down system includes a plurality of first tie rods and a through-hole jack matched with the first tie rods;

The installation of the pull-down system and the step-by-step pull-down of the upper saddle body of the loose rope sleeve to the preset position through the pull-down system include:

Install a plurality of first pull rods; the plurality of first pull rods are arranged symmetrically with respect to the center line of the main cable and penetrated through the upper saddle body of the loose rope sleeve and the lower saddle body of the loose rope sleeve; the third One end of a pull rod is limited to the lower saddle body of the loose rope sleeve, and the other end is installed in conjunction with the through-hole jack;

The first tension rod is stretched by the through-hole jack to realize the pull-down of the upper saddle body of the loose rope sleeve; during the process of pulling down the upper saddle body of the loose rope sleeve, multiple installations are carried out in stages. a second pull rod, the second pull rod is passed through the upper saddle body of the loose rope sleeve and the lower saddle body of the loose rope sleeve and limits the position;

Remove the pull-down system, and install and limit the second pull rod at the position where the first pull rod is removed from the upper saddle body of the loose lanyard and the lower saddle body of the loose lanyard;

Tighten all the second tie rods until the upper saddle body of the loose rope sleeve is pulled down to the preset position.
The construction method of loose cable sleeves for a suspension bridge according to claim 9, wherein the stepwise installation of a plurality of second tie rods includes:

When the upper saddle body of the loose rope sleeve is pulled down to a position where the second pull rod can be installed, the third saddle body is installed on one end of the upper saddle body of the loose rope sleeve and the lower saddle body of the loose rope sleeve toward the side span of the suspension bridge. Two tie rods;

When the upper saddle body of the loose lanyard is pulled down to collide with the top cone located at the first area of the lower saddle body of the loose lanyard, the upper saddle body of the loose lanyard and the lower saddle body of the loose lanyard face toward The second tie rod is installed at one end of the anchor span of the suspension bridge;

When the upper saddle body of the loose lanyard is pulled down to collide with the top cone located at the second area of the top cone of the lower saddle body of the loose lanyard, the upper saddle body of the loose lanyard and the lower saddle of the loose lanyard The second tie rod is installed in the middle part of the body; wherein, along the direction from the side span of the suspension bridge to the anchor span, the first area and the second area are arranged in sequence.