Installation method and device for supporting rigid suspension cable using existing hanger rod

Abstract

The present invention discloses an installation method and device for supporting a rigid suspension cable using an existing hanger, comprising: installing the lower end of the hanger on a steel beam through a first hinge structure, applying an upward force to the stiffening chord during installation, inserting the lower end of the hanger into position through the pin of the first hinge structure, and placing a first limiter between the bottom end of the hanger and the steel beam; adjusting the limit of the hanger to keep the hanger in a vertical state; hoisting the stiffening chord to a corresponding position, applying a certain upward force to the stiffening chord, inserting the upper end of the hanger into position through the pin of the second hinge structure, and placing a second limiter between the top of the hanger and the stiffening chord; after the stiffening chord closure construction and high-strength bolt construction are completed, the first limiter and the second limiter are removed, so that the hanger changes from being compressed to being tensile, and the force system conversion is completed. The present invention solves the problem that the linear shape of the bridge structure does not match the design caused by the stiffening chord during the closure process.

Description

Technical Field

[0001] The present invention relates to the field of bridges, and more particularly to an installation method and device for supporting rigid suspension cables using existing hangers. Background Art

[0002] The design of the steel truss rigid stiffening cable structure uses a rigid hanger to connect the steel beam and the rigid cable, and the connection method is generally pin connection (hinge connection), that is, ear plate pin holes are set at the nodes of the stiffening cable and the upper chord rod, which are concentric with the ear plate pin holes at both ends of the hanger. In order to ensure that the pin shaft can be inserted into the pin hole, most designs use the method of enlarging the ear plate pin holes at the nodes of the stiffening cable and the upper chord rod. This results in the structure being unable to eliminate the mismatch between the structural line shape caused by the pin hole gap and the design during the installation process, no matter what method is used (such as the bracket method, the jacking method). Summary of the invention

[0003] The purpose of the present invention is to provide an installation method and device for supporting a rigid suspension cable using an existing hanger rod. The rigid hanger rod is first used as a supporting structure (compression rod) for assembling a stiffening chord, and the verticality of the hanger rod is adjusted using an eight-shaped support arranged at the lower end, and then limit positions are set at the upper and lower ends. After the stiffening chord rod is connected, the limit positions are cancelled to perform system conversion, and the hanger rod is changed from a compression structure to a tension structure. In addition, each component is always kept in the designed position during the installation process, and the installation of the rigid suspension cable is completed.

[0004] In order to achieve these purposes and other advantages according to the present invention, a method for installing a rigid suspension cable using an existing hanger rod is provided, comprising the following steps:

[0005] Step 1: Install the lower end of the suspension rod on the steel beam through the first hinge structure. When installing, first apply an upward force to the suspension rod, then insert the lower end of the suspension rod through the pin of the first hinge structure into place, and make the pin of the first hinge structure in a tensioned position, and put a first limit device between the bottom end of the suspension rod and the steel beam;

[0006] Step 2: Adjust the limit of the boom to keep it vertical;

[0007] Step 3: hoist the stiffening chord to the corresponding position, apply a certain upward force to the stiffening chord, insert the upper end of the suspension rod through the pin of the second hinge structure, and make the pin of the second hinge structure in a tensioned position, and place the second limit device between the top of the suspension rod and the stiffening chord;

[0008] Step 4: After the stiffening chord closure construction and high-strength bolt construction are completed, the first limit device and the second limit device are removed to change the hanger from being under compression to being under tension, completing the force system conversion.

[0009] Preferably, in the step 2, the suspension rod is fixed by an eight-shaped diagonal brace structure so that the suspension rod is kept in a vertical state.

[0010] Preferably, the eight-shaped diagonal bracing structure comprises:

[0011] A clamp, which is pre-tightened on the boom;

[0012] A pair of adjustable steel tie rods are symmetrically arranged on both sides of the clamp, and both ends of the adjustable steel tie rods are connected to the clamp and the steel beam through ear plates.

[0013] Preferably, the first hinge structure and the second hinge structure are the same; the first hinge structure comprises:

[0014] A group of relatively arranged steel supports, wherein the steel supports are provided with stiffening plates;

[0015] The pin is detachably mounted between a set of steel supports.

[0016] Preferably, the first limiting device is a pair of square pads with a height-adjustable screw structure disposed between them, and the pin of the first hinge structure is in point-surface contact with the first limiting device;

[0017] The second limit device is a screw structure with adjustable height arranged between a wedge-shaped pad and a square pad, the top surface of the second limit device is in contact with the stiffening chord, and the second limit device and the pin shaft of the second hinge structure are in point-surface contact;

[0018] In step one and step three, when the first limit device and the second limit device are placed, the heights of the first limit device and the second limit device have been adjusted to the designed heights by corresponding screw rods; in step four, before removing the first limit device and the second limit device, the heights of the first limit device and the second limit device need to be lowered by adjusting the corresponding screw rods.

[0019] The present invention also provides a device for installing a rigid suspension cable supported by an existing hanger rod, comprising:

[0020] boom;

[0021] The first hinge structure and the second hinge structure are the same, both comprising a group of steel supports and a pin, the group of steel supports are arranged opposite to each other, and the pin is detachably installed between the group of steel supports; the lower end of the suspension rod is interlacedly connected with the pin of the first hinge structure, and the upper end of the suspension rod is interlacedly connected with the pin of the second hinge structure;

[0022] A first limiting device and a second limiting device, wherein the first limiting device is arranged at the bottom end of the suspension rod, and the second limiting device is arranged at the top end of the suspension rod;

[0023] An eight-shaped diagonal bracing structure is used to fix the suspension rod; the eight-shaped diagonal bracing structure includes a clamp and a pair of adjustable steel tie rods, the clamp is pre-tightened and fixed on the suspension rod, and the pair of adjustable steel tie rods are symmetrically arranged on both sides of the clamp, and one end of the adjustable steel tie rod is fixed to the clamp through an ear plate.

[0024] Preferably, the first limiting device is a pair of square pads with a height-adjustable screw structure disposed between them, and the pin of the first hinge structure is in point-surface contact with the first limiting device;

[0025] The second limit device is a screw structure with adjustable height arranged between the wedge-shaped pad and the square pad. The top surface of the second limit device is in contact with the stiffening chord, and the second limit device is in point-to-surface contact with the pin shaft of the second hinge structure.

[0026] Preferably, a stiffening plate is provided on the steel support. The present invention has at least the following beneficial effects:

[0027] 1. The method of the present invention uses a permanent structure as a supporting member, and does not require additional temporary support to assist the installation of the rigid suspension cable, thereby reducing the investment in temporary projects, greatly saving project costs, and improving installation efficiency.

[0028] 2. The method of the present invention is quick to operate, the structural stress is clear, and the safety factor is increased.

[0029] 3. The present invention avoids the safety risks caused by the large-scale use of temporary structures.

[0030] 4. The present invention avoids the use of traditional temporary supports as supporting structures to occupy bridge deck space.

[0031] 5. The present invention is highly practical for installation of rigid force-bearing structures.

[0032] 6. The adjustable S-shaped steel tie rod of the present invention is simple to set up, convenient for adjusting the verticality of the steel suspension rod, and can be repeatedly used, thus saving construction costs.

[0033] 7. The first limit device and the second limit device are less deformed under pressure, and the linear control is more guaranteed.

[0034] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram after the rigid suspension cable of the present invention is installed;

[0036] Figure 2It is a schematic diagram of the suspension rod of the present invention being reinforced by an eight-shaped diagonal bracing structure;

[0037] Figure 3 It is a schematic diagram of the position limit after the top pin of the suspension rod of the present invention is in a tension state;

[0038] Figure 4 is a structural schematic diagram of a first rotary hinge structure of the present invention;

[0039] Figure 5 is a structural schematic diagram of an implementation mode of the first limiting device of the present invention;

[0040] Figure 6 It is a structural schematic diagram of an implementation manner of the second limiting device of the present invention.

[0041] Among them, 1 is a rigid suspension cable, 2 is a hanger, 3 is a stiffening chord, 4 is a first hinge structure, 5 is a second hinge structure, 6 is a first limit device, 7 is a second limit device, 8 is an eight-shaped diagonal bracing structure, 9 is a clamp, 10 is an adjustable steel rod, 11 is an ear plate, 12 is a steel beam, 13 is a pin, 14 is a steel support, 15 is a stiffening plate, 16 is a square pad, 17 is a wedge-shaped pad, and 18 is an adjustable height screw. DETAILED DESCRIPTION

[0042] The present invention is further described in detail below in conjunction with embodiments so that those skilled in the art can implement the invention with reference to the description.

[0043] In the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. to indicate directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0044] Example 1

[0045] This embodiment is based on the Zengjiayan Jialing River Bridge, a double-deck main span 270m rigid suspension cable 1 stiffened steel truss beam bridge, which ranks first among similar bridges in China. Among them, the installation method of the present invention using the existing hanger 2 to support the rigid suspension cable 1 is applied to the joint installation of the stiffening chord 3, such as Figures 1 to 4 As shown, the following steps are included:

[0046] Step 1: Install the lower end of the suspension rod 2 on the steel beam 12 through the first hinge structure 4. When installing, first apply a certain upward force to the suspension rod 2, then insert the lower end of the suspension rod 2 into place through the pin 13 of the first hinge structure 4, and make the pin 13 of the first hinge structure 4 in a tensioned state, and put the first limit device 6 between the bottom end of the suspension rod 2 and the steel beam 12;

[0047] Step 2: Adjust the limit of the boom 2 to keep the boom 2 in a vertical state;

[0048] Step 3: hoist the stiffening chord 3 to the corresponding position, apply a certain lifting force to the stiffening chord 3, insert the upper end of the suspension rod 2 through the pin 13 of the second hinge structure 5, and make the pin 13 of the second hinge structure 5 in a tensioned position, and put the second limit device 7 between the top of the suspension rod 2 and the stiffening chord 3;

[0049] Step 4: After the closure construction of the stiffening string 3 and the high-strength bolt construction are completed, the first limit device 6 and the second limit device 7 are removed, so that the suspension rod 2 changes from being compressed to being tensile, completing the force system conversion.

[0050] In the above technical solution, the present invention utilizes the dual tensile and compressive properties of the permanent structural rigid hanger 2, and makes the hanger 2 replace the temporary support in a compressed state when the stiffening chord 3 is installed. When using the permanent structural rigid hanger 2, due to the gap limitation of the hinge structure, if the compression state changes to the tension state, a displacement of 2-3mm will be generated, which directly causes the overall deformation of the steel structure and even makes it impossible to close. The present invention allows the hinge structure to be in a tensile state in advance before being compressed, thereby avoiding structural deformation caused by displacement after the stiffening chord 3 is installed.

[0051] In a preferred embodiment of the installation method of the present application using an existing hanger 2 to support a rigid cable 1, in step 2, the hanger 2 is fixed by an eight-shaped diagonal brace structure 8 so that the hanger 2 remains in a vertical state and is smoothly connected to the upper and lower chords by a pin 13.

[0052] In the above technical scheme, in order to ensure that the hanger 2 is in the designed vertical state, the force on the limit device and the hanger 2 is point-to-surface contact, the contact is prone to slippage and the angle of the hanger 2 cannot be guaranteed. An adjustable steel pull rod is provided in the middle of the adopted eight-shaped support structure, and the upper part of the eight-shaped support is connected to the hanger 2 with a clamp 9. This structure has reliable force and is easy to operate.

[0053] In a preferred embodiment of the installation method of the present application using the existing hanger rod 2 to support the rigid suspension cable 1, the eight-shaped diagonal bracing structure 8 includes:

[0054] The hoop 9 is made of fine-rolled threaded steel bar, which is pre-tightened on the suspension rod 2. In this embodiment, the pre-tightening force of a single fine-rolled threaded steel bar is 250KN.

[0055] A pair of adjustable steel tie rods 10 are symmetrically arranged on both sides of the clamp 9 , and both ends of the adjustable steel tie rods 10 are connected to the clamp 9 and the steel beam 12 through ear plates 11 .

[0056] In a preferred embodiment of the installation method of the present application using the existing hanger 2 to support the rigid suspension cable 1, the first hinge structure 4 and the second hinge structure 5 are the same; the first hinge structure 4 includes:

[0057] A group of relatively arranged steel supports 14, wherein the steel supports 14 are provided with stiffening plates 15;

[0058] The pin shaft 13 is detachably installed between a group of steel supports 14 .

[0059] In a preferred embodiment of the installation method of the present application using the existing hanger rod 2 to support the rigid suspension cable 1, as shown in FIG. Figures 5-6 As shown, the first limiting device 6 is a pair of square pads 16, between which a screw rod 18 with adjustable height is arranged, so that the height between the square pads 16 can be adjusted, and the pin shaft 13 of the first hinge structure 4 is in point-surface contact with the first limiting device 6;

[0060] The second limiting device 7 is a wedge-shaped pad 17 and a square pad 16, and an adjustable screw 18 structure is arranged between the wedge-shaped pad 17 and the square pad 16, and the height between the wedge-shaped pad 17 and the square pad 16 can be adjusted. The top surface of the second limiting device 7 is in contact with the stiffening chord 3, and the second limiting device 7 and the pin shaft 13 of the second hinge structure 5 are in point-to-surface contact.

[0061] In step one and step three, when the first limit device and the second limit device are placed, the heights of the first limit device and the second limit device have been adjusted to the designed heights by corresponding screw rods; in step four, before removing the first limit device and the second limit device, the heights of the first limit device and the second limit device need to be lowered by adjusting the corresponding screw rods.

[0062] Example 2

[0063] A device for installing a rigid suspension cable supported by an existing boom, comprising:

[0064] Boom 2;

[0065] The first hinge structure 4 and the second hinge structure 5 are the same, and both include a group of steel supports 14 and a pin 13, wherein the group of steel supports 14 are arranged opposite to each other, and the pin 13 is detachably installed between the group of steel supports 14; the lower end of the suspension rod 2 is interlacedly connected with the pin 13 of the first hinge structure 4, and the upper end of the suspension rod 2 is interlacedly connected with the pin 13 of the second hinge structure 5;

[0066] A first limiting device 6 and a second limiting device 7, wherein the first limiting device 6 is arranged at the bottom end of the suspension rod 2, and the second limiting device 7 is arranged at the top end of the suspension rod 2;

[0067] The eight-shaped diagonal bracing structure 8 fixes the suspension rod 2; the eight-shaped diagonal bracing structure 8 includes a clamp 9 and a pair of adjustable steel tie rods 10, the clamp 9 is pre-tightened and fixed on the suspension rod 2, and the pair of adjustable steel tie rods 10 are symmetrically arranged on both sides of the clamp 9, and one end of the adjustable steel tie rod 10 is fixed to the clamp 9 through an ear plate 11.

[0068] In a preferred embodiment of the present application, the device for installing a rigid suspension cable 1 supported by an existing suspension rod 2 is as follows: Figures 5-6 As shown, the first limiting device 6 is a pair of square pads 16 with a height-adjustable screw 18 structure disposed between them, and the pin 13 of the first hinge structure 4 is in point-surface contact with the first limiting device 6;

[0069] The second limit device 7 is a structure with an adjustable screw rod 18 between a wedge-shaped cushion block 17 and a square cushion block 16. The top surface of the second limit device 7 is in contact with the stiffening chord 3, and the second limit device 7 is in point-to-surface contact with the pin shaft 13 of the second hinge structure 5. In this embodiment, the adjustable screw rod 18 is composed of an internal threaded sleeve and a pair of screw rods arranged at both ends of the internal threaded sleeve.

[0070] In a preferred embodiment of the device for installing the rigid suspension cable 1 with the existing hanger rod 2 of the present application, a stiffening plate 15 is provided on the steel support 14 .

[0071] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the embodiments shown and described herein.

Claims

1. A device for installing a rigid suspension cable supported by an existing boom, It is characterized in that include: boom; The first hinge structure and the second hinge structure are the same, both comprising a group of steel supports and a pin, the group of steel supports are arranged opposite to each other, and the pin is detachably installed between the group of steel supports; the lower end of the suspension rod is interlacedly connected with the pin of the first hinge structure, and the upper end of the suspension rod is interlacedly connected with the pin of the second hinge structure; A first limiting device and a second limiting device, wherein the first limiting device is arranged at the bottom end of the suspension rod, and the second limiting device is arranged at the top end of the suspension rod; An eight-shaped diagonal brace structure is used to fix the suspension rod; the eight-shaped diagonal brace structure includes a clamp and a pair of adjustable steel tie rods, the clamp is pre-tightened and fixed on the suspension rod, and the pair of adjustable steel tie rods are symmetrically arranged on both sides of the clamp, and one end of the adjustable steel tie rod is fixed to the clamp through an ear plate; The first limiting device is a pair of square pads with a height-adjustable screw structure disposed between them, and the pin of the first hinge structure is in point-surface contact with the first limiting device; The second limit device is a screw structure with adjustable height arranged between the wedge-shaped pad and the square pad. The top surface of the second limit device is in contact with the stiffening chord, and the second limit device is in point-to-surface contact with the pin shaft of the second hinge structure.

2. The device for installing a rigid suspension cable supported by an existing boom as claimed in claim 1, It is characterized in that A stiffening plate is arranged on the steel support.

3. An installation method using the device according to any one of claims 1 to 2, It is characterized in that The following steps are involved: Step 1: Install the lower end of the suspension rod on the steel beam through the first hinge structure. When installing, first apply an upward force to the suspension rod, then insert the lower end of the suspension rod through the pin of the first hinge structure into place, and make the pin of the first hinge structure in a tensioned position, and put a first limit device between the bottom end of the suspension rod and the steel beam; Step 2: Adjust the limit of the boom to keep it vertical; Step 3: hoist the stiffening chord to the corresponding position, apply a certain upward force to the stiffening chord, insert the upper end of the suspension rod through the pin of the second hinge structure, and make the pin of the second hinge structure in a tensioned position, and place the second limit device between the top of the suspension rod and the stiffening chord; Step 4: After the stiffening chord closure construction and high-strength bolt construction are completed, the first limit device and the second limit device are removed to change the hanger from being under compression to being under tension, completing the force system conversion.

4. The installation method according to claim 3, It is characterized in that In the step 2, the suspension rod is fixed by an eight-shaped diagonal brace structure so that the suspension rod is kept in a vertical state.

5. The installation method according to claim 4, It is characterized in that The eight-shaped diagonal bracing structure comprises: A clamp, which is pre-tightened on the boom; A pair of adjustable steel tie rods are symmetrically arranged on both sides of the clamp, and both ends of the adjustable steel tie rods are connected to the clamp and the steel beam through ear plates.

6. The installation method according to claim 3 or 4, It is characterized in that The first hinge structure and the second hinge structure are the same; The first hinge structure comprises: A group of relatively arranged steel supports, wherein the steel supports are provided with stiffening plates; The pin is detachably mounted between a set of steel supports.

7. The installation method according to claim 3, It is characterized in that The first limiting device is a pair of square pads with a height-adjustable screw structure disposed between them, and the pin of the first hinge structure is in point-surface contact with the first limiting device; The second limit device is a screw structure with adjustable height arranged between a wedge-shaped pad and a square pad, the top surface of the second limit device is in contact with the stiffening chord, and the second limit device and the pin shaft of the second hinge structure are in point-surface contact; In step one and step three, when the first limit device and the second limit device are placed, the heights of the first limit device and the second limit device have been adjusted to the designed heights by corresponding screw rods; in step four, before removing the first limit device and the second limit device, the heights of the first limit device and the second limit device need to be lowered by adjusting the corresponding screw rods.

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