Construction method for comprehensive maintenance and reinforcement system of multi-tower cable-stayed bridge

Abstract

The invention relates to a construction method of a comprehensive maintenance and reinforcement system of a multi-tower cable-stayed bridge, which adopts a tower bracket rotating span-reducing supporting and hanging combined in-tower steel construction platform technology, can realize folding span reduction of the in-tower steel construction platform through an in-tower bracket rotating mechanism, is convenient for hoisting of an in-tower hoisting winch, and effectively improves the construction efficiency; by adopting a tower exterior profile steel rail sliding and lifting profile steel construction platform technology and through standardized, factory-like and assembled design, multiple times of turnover use of main components are achieved, transportation is convenient, the construction efficiency is improved, meanwhile, enough operation space is provided, and the safety of high-altitude construction is guaranteed; a bridge floor cantilever moving type rail lower hanging type beam bottom construction platform technology is adopted, and the mobility and operability of the platform are achieved by installing walking wheels on a rail. Through the design that the chain block connecting structure is fixed to the front face of the cantilever hanging basket beam, the chain block connecting structure is fixed to the side face of the cantilever hanging basket and the balance weight, the stability and safety of the platform are enhanced.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a construction method for a comprehensive maintenance and reinforcement system of a multi-tower cable-stayed bridge. Background Art

[0002] With the development of the economy, bridge construction has made great progress. There are more and more bridge projects in operation, and the structural construction has become more complex and diverse. Many bridges that have been built for many years need repair and reinforcement, especially the repair and reinforcement construction of multi-tower cable-stayed bridges, which has become the top priority in bridge maintenance.

[0003] The maintenance and reinforcement of multi-tower cable-stayed bridges face technical challenges, such as insufficient safety and flexibility, slow construction speed, and non-standard safety facility settings. Therefore, innovative construction methods and technologies are needed to improve the efficiency and safety of maintenance and reinforcement. The use of a comprehensive maintenance and reinforcement system and construction method for multi-tower cable-stayed bridges is an effective measure to solve this problem. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a construction method for a comprehensive maintenance and reinforcement system for a multi-tower cable-stayed bridge.

[0005] The construction method of the comprehensive maintenance and reinforcement system of the multi-tower cable-stayed bridge comprises the following steps:

[0006] Step 1: Using the anchor tooth block platform in the tower as the support point, set up the tower support rotation span reduction support hanging combination tower steel construction platform, and then carry out the multi-tower cable-stayed bridge tower maintenance and reinforcement construction;

[0007] Step 2: Install the outer tower sliding steel track along the main tower of the cable tower, install the outer tower steel track sliding steel system on the outer tower sliding steel track, and carry out the outer tower maintenance and reinforcement construction of the multi-tower cable-stayed bridge;

[0008] Step 3. Repair and reinforcement of the anchorage position of the cable end at the bottom of the beam: lay a movable track at the predetermined position on the front of the beam, and set up a construction platform at the bottom of the beam hanging under the movable track of the bridge deck cantilever; remove the old anchor cup nut of the cable beam end and install the new anchor cup nut of the cable beam end at the anchorage position of the cable end.

[0009] Step 4: Move the cantilevered movable track-mounted bottom beam construction platform to start the repair and reinforcement construction of the next bottom beam cable end anchorage position until all repair and reinforcement construction of the bottom cable end anchorage position of the multi-tower cable-stayed bridge is completed.

[0010] Preferably, in step one, the tower support rotating span-reducing support and hanging combination tower steel construction platform includes a tower construction platform support steel frame, a tower patterned plate construction platform and a tower construction platform protective railing. The tower construction platform support steel frame, the tower patterned plate construction platform and the tower construction platform protective railing are hoisted by the tower hoisting winch. The middle part of the construction platform support steel frame is the tower support rotating mechanism. The tower support rotating mechanism can be used to fold the tower construction platform support steel frame. The construction platform support steel frame can be hoisted in and out after being folded. Arrive at the predetermined position, open the rotating mechanism of the tower support for installation, fix the supporting steel frame of the construction platform in the tower as the load-bearing structure on the anchor tooth block platform in the tower, fully lay the tower patterned plate construction platform on the top of the supporting steel frame of the construction platform in the tower, fix the protective railings of the tower construction platform around the patterned plate construction platform in the tower, and then carry out the repair and reinforcement construction inside the tower of the multi-tower cable-stayed bridge; after the repair and reinforcement construction of one position in the tower of the multi-tower cable-stayed bridge is completed, repeat the above steps to start the repair and reinforcement construction at the next position until all the repair and reinforcement construction in the tower of the multi-tower cable-stayed bridge is completed.

[0011] Preferably, in step two, the base of the outer tower sliding steel system is first installed near the main tower of the cable tower, and then the outer tower sliding steel track is installed along the main tower of the cable tower, and the outer tower steel track sliding steel system is installed on the outer tower sliding steel track. The outer tower steel track sliding steel system is provided with an upper and lower outer tower construction platform, and the outer tower construction platform protection system is installed around the outer tower construction platform. The outer tower construction platform driving system controls the tower outer steel track sliding steel system to run along the outer tower sliding steel track to a predetermined position, and then the outer tower maintenance and reinforcement construction of the multi-tower cable-stayed bridge is carried out.

[0012] Preferably, in step three, a mobile track is laid at a predetermined position on the front side of the beam, and a mobile track running wheel is installed on the mobile track. The mobile track running wheel is vertically connected to a first vertical connecting rod and a second vertical connecting rod, and the first vertical connecting rod and the second vertical connecting rod are horizontally connected through an upper telescopic arm and a lower telescopic arm. The lateral extension and contraction of the upper telescopic arm and the lower telescopic arm can be controlled by a control system. The upper telescopic arm and the first vertical connecting rod are connected through a first cross beam of a cantilever hanging basket, and the upper telescopic arm and the second vertical connecting rod are connected through a second cross beam of the cantilever hanging basket. A suitable The balancing weight is measured to strengthen the stability of the bridge deck cantilever mobile track-mounted bottom beam construction platform, and the cantilever basket beam front fixed fall chain connection structure is installed on the cantilever basket longitudinal beam inside the guardrail to strengthen and fix it on the front face of the beam, a first strengthening connecting diagonal rod is arranged between the second vertical connecting rod and the cantilever basket longitudinal beam, and a cantilever guardrail folding beam is arranged on the cantilever basket longitudinal beam, and the cantilever mobile track-mounted bottom beam construction platform is controlled to fold upwards through the control system, and the lateral extension and contraction of the upper telescopic arm and the lower telescopic arm are jointly controlled to enable the cantilever mobile track-mounted bottom beam construction platform to pass through the inclined cable.

[0013] Preferably, a third cross beam of the cantilever basket is connected to the longitudinal beam of the cantilever basket, and the upper ends of the third reinforced connecting vertical rod and the fourth reinforced connecting vertical rod are respectively connected to the longitudinal beam of the cantilever basket, and the lower ends of the third reinforced connecting vertical rod and the fourth reinforced connecting vertical rod are respectively connected through the cantilever basket working platform connecting cross rod and the cantilever basket working bottom platform, and the middle of the third reinforced connecting vertical rod and the fourth reinforced connecting vertical rod are respectively connected through the third reinforced connecting diagonal rod, the cantilever basket working platform connecting diagonal rod and the reinforced connecting cross rod, the cantilever basket longitudinal beam is connected to the fourth reinforced connecting vertical rod through the second reinforced connecting diagonal rod, the cantilever basket working platform connecting cross rod and the cantilever basket working bottom platform are connected through the cantilever basket working platform connecting vertical rod, and the cantilever basket side fixed fall chain connection structure is installed on the third reinforced connecting vertical rod to strengthen the fixation on the side of the beam, and then the old inclined cable beam end anchor cup nut and new inclined cable beam end anchor cup nut are removed from the inclined cable end anchor position and installed.

[0014] Preferably, after the construction of an anchoring position of an inclined cable end at the bottom of a multi-tower cable-stayed bridge is completed, the control system controls the cantilevered movable track-mounted bottom beam construction platform to fold upward, and jointly controls the lateral extension and retraction of the upper telescopic arm and the lower telescopic arm to ensure that when the cantilevered movable track-mounted bottom beam construction platform is moved, the mobile track walking wheels on the mobile track allow the construction platform to smoothly move through the inclined cable, and then start the maintenance and reinforcement construction of the next anchoring position of the inclined cable end at the bottom of the beam, repeat the above steps to start the maintenance and reinforcement construction of the next position, until all the maintenance and reinforcement construction of the anchoring position of the inclined cable end at the bottom of the multi-tower cable-stayed bridge is completed.

[0015] The beneficial effects of the present invention are:

[0016] 1) The present invention adopts the technology of tower support rotation and span reduction support and hanging combination tower steel construction platform. Through the tower support rotation mechanism, the tower steel construction platform can be folded and span reduced, which is convenient for hoisting winches in the tower and effectively improves construction efficiency.

[0017] 2) The present invention adopts the technology of the tower outer steel track sliding steel construction platform. Through standardized, factory-based and assembled design, it realizes the multiple turnover use of the main components, facilitates transportation, improves construction efficiency, and provides sufficient operating space to ensure the safety of high-altitude construction.

[0018] 3) The present invention adopts the technology of bridge deck cantilever movable track-mounted beam bottom construction platform, and realizes the mobility and operability of the platform by installing walking wheels on the track; the stability and safety of the platform are enhanced by the design of the cantilever basket beam front fixed fall chain connection structure, the cantilever basket side fixed fall chain connection structure and the counterweight; through the setting of the cantilever guardrail folding beam and the telescopic arm, it can be ensured that when the cantilever movable track-mounted beam bottom construction platform is moved, the construction platform can pass through the inclined cable smoothly, and the crane can be eliminated for lifting, which effectively improves the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the steel construction platform in the tower with a rotating, span-reducing, and hanging combination tower support;

[0020] Figure 2 This is a schematic diagram of the structure of the steel track sliding steel construction platform outside the tower;

[0021] Figure 3 It is a structural schematic diagram of the bridge deck cantilever movable track-mounted under-beam construction platform.

[0022] In the figure: 1-main tower of cable tower, 2-stayed cable, 3-tensioning end of stay cable, 4-treadle plate construction platform in tower, 5-anchor tooth block platform in tower, 6-support steel frame of construction platform in tower, 7-rotating mechanism of bracket in tower, 8-protective railing of construction platform in tower, 9-hoisting winch in tower, 10-base of sliding steel system outside tower, 11-sliding steel track outside tower, 12-sliding steel system of steel track outside tower, 13-construction platform outside tower, 14-protection system of construction platform outside tower, 15-driving system of construction platform outside tower, 16-beam, 17-mobile track, 18-first vertical connecting rod, 19-first beam of cantilever hanging basket, 20-control system, 21-upper telescopic arm, 22-lower telescopic arm, 23-second vertical connecting rod, 24-second beam of cantilever hanging basket, 25- Guardrail, 26-front fixed fall chain connection structure of cantilever basket beam, 27-counterweight, 28-first reinforced connecting diagonal rod, 29-folding beam of cantilever guardrail, 30-third cross beam of cantilever basket, 31-second reinforced connecting diagonal rod, 32-longitudinal beam of cantilever basket, 33-third reinforced connecting diagonal rod, 34-third reinforced connecting vertical rod, 35-side fixed fall chain connection structure of cantilever basket, 36-cantilever basket working platform connecting diagonal rod, 37-cantilever basket working platform connecting cross rod, 38-cantilever basket working platform connecting vertical rod, 39-cantilever basket working bottom platform, 40-anchor position of inclined cable end, 41-anchor cup nut of old inclined cable beam end, 42-anchor cup nut of new inclined cable beam end, 43-mobile track walking wheel, 44-fourth reinforced connecting vertical rod, 45-reinforced connecting cross rod. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0024] Embodiment 1

[0025] As an embodiment, the construction method of the comprehensive maintenance and reinforcement system of the multi-tower cable-stayed bridge comprises the following steps:

[0026] Step 1: Repair and reinforcement construction inside the tower of a multi-tower cable-stayed bridge: When the original ladder platform inside the main tower 1 of the cable tower cannot be used as the tensioning platform for the tensioning end 3 of the cable 2, the anchor tooth block platform 5 inside the tower is used as the support point to set up a tower support rotation span reduction support and hanging combination tower steel construction platform. The tower construction platform support steel frame 6, the tower patterned plate construction platform 4 and the tower construction platform guardrail 8 are hoisted by the tower hoisting winch 9. The middle part of the construction platform support steel frame 6 is the tower support rotation mechanism 7. The rotating mechanism 7 can fold the supporting steel frame 6 of the construction platform in the tower. After the construction platform supporting steel frame 6 is folded, it can be hoisted in and out. When it is hoisted to the predetermined position, the rotating mechanism 7 of the bracket in the tower is opened for installation. The supporting steel frame 6 of the construction platform in the tower is fixed on the anchoring tooth block platform 5 in the tower as a load-bearing structure. The top of the supporting steel frame 6 of the construction platform in the tower is fully paved with the patterned plate construction platform 4 in the tower. The protective railings 8 of the construction platform in the tower are fixed around the patterned plate construction platform 4 in the tower, and then the maintenance and reinforcement construction of the multi-tower cable-stayed bridge tower is carried out. After the maintenance and reinforcement construction of one position in the tower of the multi-tower cable-stayed bridge is completed, the above steps are repeated to start the maintenance and reinforcement construction of the next position until all the maintenance and reinforcement construction in the tower of the multi-tower cable-stayed bridge is completed.

[0027] Step 2, external tower maintenance and reinforcement construction of multi-tower cable-stayed bridge: first install the external tower sliding steel system base 10 near the main tower 1 of the cable tower, then install the external tower sliding steel track 11 along the main tower 1 of the cable tower, install the external tower steel track sliding steel system 12 on the external tower sliding steel track 11, and the external tower steel track sliding steel system 12 is provided with an upper and lower external tower construction platform 13 on the external tower steel track sliding steel system 12, and the external tower construction platform 13 is surrounded by a tower construction platform protection system 14, and the external tower construction platform driving system 15 controls the external tower steel track sliding steel system 12 to run along the external tower sliding steel track 11 to a predetermined position, and then carry out the external tower maintenance and reinforcement construction of the multi-tower cable-stayed bridge.

[0028] Step 3: Repair and reinforcement of the anchoring position of the inclined cable end at the bottom of the beam: a mobile track 17 is laid at a predetermined position on the front of the beam 16, and a mobile track running wheel 43 is installed on the mobile track 17. The first vertical connecting rod 18 and the second vertical connecting rod 23 are vertically connected to the mobile track running wheel 43. The first vertical connecting rod 18 and the second vertical connecting rod 23 are horizontally connected through the upper telescopic arm 21 and the lower telescopic arm 22. The upper telescopic arm 21 and the lower telescopic arm 22 can be controlled to extend and retract horizontally through the control system 20. The upper telescopic arm 21 and the first vertical connecting rod 18 are connected through the first cross beam 19 of the cantilever hanging basket. The upper telescopic arm 21 and The second vertical connecting rod 23 is connected through the second cross beam 24 of the cantilever basket, and a proper counterweight 27 is placed on the lower telescopic arm 22 to strengthen the stability of the bridge deck cantilever movable track under-hanging beam bottom construction platform. The cantilever basket beam front fixed fall chain connection structure 26 is installed on the cantilever basket beam inner side of the guardrail 25 to strengthen the fixation on the front of the beam 16. A first strengthening connecting diagonal rod 28 is arranged between the second vertical connecting rod 23 and the cantilever basket beam 32, and a cantilever guardrail folding beam 29 is arranged on the cantilever basket beam 32. The cantilever movable track under-hanging beam bottom construction platform can be controlled to fold upwards through the control system 20, and combined with Controlling the lateral extension and retraction of the upper telescopic arm 21 and the lower telescopic arm 22 can ensure that when the cantilever movable track under-hanging beam bottom construction platform is moved, the construction platform can smoothly pass through the inclined cable 2. The cantilever hanging basket longitudinal beam 32 is connected with the cantilever hanging basket third cross beam 30. The upper ends of the third reinforced connecting vertical rod 34 and the fourth reinforced connecting vertical rod 44 are respectively connected to the cantilever hanging basket longitudinal beam 32. The lower ends of the third reinforced connecting vertical rod 34 and the fourth reinforced connecting vertical rod 44 are respectively connected to the cantilever hanging basket working platform connecting cross rod 37 and the cantilever hanging basket working bottom platform 39. The third reinforced connecting vertical rod 34 and the fourth reinforced connecting vertical rod 44 are respectively connected to the cantilever hanging basket working platform connecting cross rod 37 and the cantilever hanging basket working bottom platform 39 through the third reinforced connecting vertical rod 34 and the fourth reinforced connecting vertical rod 44. The connecting diagonal rod 33, the cantilever basket working platform connecting diagonal rod 36 and the reinforcing connecting cross rod 45 are reinforced and connected, the cantilever basket longitudinal beam 32 and the fourth reinforcing connecting vertical rod 44 are reinforced and connected by the second reinforcing connecting diagonal rod 31, the cantilever basket working platform connecting cross rod 37 and the cantilever basket working bottom platform 39 are connected by the cantilever basket working platform connecting vertical rod 38, and the cantilever basket side fixed fall chain connecting structure 35 is installed on the third reinforcing connecting vertical rod 34 to strengthen and fix it on the side of the beam 16, and then the cable end anchor position 40 is carried out to remove the old cable beam end anchor cup nut 41 and install the new cable beam end anchor cup nut 42.After the construction of an anchoring position of an inclined cable end at the bottom of the multi-tower cable-stayed bridge is completed, the control system 20 controls the cantilevered movable track-mounted bottom beam construction platform to fold upward, and jointly controls the lateral extension and contraction of the upper telescopic arm 21 and the lower telescopic arm 22 to ensure that when the cantilevered movable track-mounted bottom beam construction platform is moved, the mobile track walking wheels 43 on the mobile track 17 allow the construction platform to smoothly move through the inclined cable 2, and then start the maintenance and reinforcement construction of the next anchoring position of the inclined cable end at the bottom of the beam, repeat the above steps to start the maintenance and reinforcement construction of the next position, until all the maintenance and reinforcement construction of the anchoring position of the inclined cable end at the bottom of the multi-tower cable-stayed bridge is completed.

[0029] Note: If there are enough construction workers and the construction of the anchorage positions of the cable ends inside and outside the towers and at the bottom of the beams of a multi-tower cable-stayed bridge does not affect each other, the construction can be carried out simultaneously, effectively saving the construction period.

[0030] Embodiment 2

[0031] As another embodiment, this embodiment 2 proposes, based on the embodiment 1, a comprehensive maintenance and reinforcement system for a multi-tower cable-stayed bridge:

[0032] The anchoring tooth block platform 5 in the tower is used as the support point in the main tower 1 of the cable tower, and a tower bracket rotation span reduction support and hanging combined tower steel construction platform is set up.

[0033] An outer tower sliding steel track 11 is installed along the main tower 1 of the cable tower, an outer tower steel track sliding steel system 12 is installed on the outer tower sliding steel track 11, and an upper and lower outer tower construction platform 13 is arranged on the outer tower steel track sliding steel system 12;

[0034] A movable track 17 is laid on the front side of the beam 16 , and a bridge deck cantilever movable track underhanging beam bottom construction platform is provided on the movable track 17 .

[0035] When the original ladder platform in the main tower 1 of the cable tower cannot be used as the tensioning platform of the cable tensioning end 3 of the cable 2, the anchor tooth block platform 5 in the tower is used as the supporting point to set up the tower support rotating span reduction support and hanging combined tower steel construction platform, the tower construction platform support steel frame 6, the tower pattern plate construction platform 4 and the tower construction platform guardrail 8 are hoisted by the tower hoisting winch 9, and the middle part of the construction platform support steel frame 6 is the tower support rotation mechanism 7, through which the tower support rotation mechanism 7 can be used to rotate the tower The inner construction platform support steel frame 6 is folded, and after being folded, the construction platform support steel frame 6 is hoisted in and out, and hoisted to the predetermined position, the tower bracket rotation mechanism 7 is opened for installation, and the tower construction platform support steel frame 6 is fixed on the tower anchor tooth block platform 5 as a load-bearing structure, and the top of the tower construction platform support steel frame 6 is fully paved with the tower inner patterned plate construction platform 4, and the tower inner patterned plate construction platform 4 is fixed with the tower construction platform protection railings 8, and then the multi-tower cable-stayed bridge tower maintenance and reinforcement construction is carried out.

[0036] First, install the outer tower sliding steel system base 10 near the main tower 1 of the cable tower, then install the outer tower sliding steel track 11 along the main tower 1, install the outer tower steel track sliding steel system 12 on the outer tower sliding steel track 11, and set upper and lower outer tower construction platforms 13 on the outer tower steel track sliding steel system 12. The outer tower construction platform 13 is surrounded by an outer tower construction platform protection system 14. The outer tower construction platform driving system 15 controls the outer tower steel track sliding steel system 12 to run along the outer tower sliding steel track 11 to a predetermined position, and then carry out the outer tower maintenance and reinforcement construction of the multi-tower cable-stayed bridge.

[0037] A mobile track 17 is laid at a predetermined position on the front of the beam 16, and a mobile track running wheel 43 is installed on the mobile track 17. The mobile track running wheel 43 is vertically connected to a first vertical connecting rod 18 and a second vertical connecting rod 23. The first vertical connecting rod 18 and the second vertical connecting rod 23 are horizontally connected through an upper telescopic arm 21 and a lower telescopic arm 22. The lateral extension and contraction of the upper telescopic arm 21 and the lower telescopic arm 22 can be controlled by a control system 20. The upper telescopic arm 21 and the first vertical connecting rod 18 are connected through a first cross beam 19 of a cantilever hanging basket, and the upper telescopic arm 21 and the second vertical connecting rod 23 are connected through a first cross beam 19 of a cantilever hanging basket. The two cross beams 24 are connected, and a proper amount of counterweight 27 is placed on the lower telescopic arm 22 to strengthen the stability of the bridge deck cantilever mobile track under-hanging beam bottom construction platform. The cantilever basket beam front fixed fall chain connection structure 26 is installed on the inner side of the guardrail 25 to strengthen the fixation on the front of the beam 16. A first strengthening connecting diagonal rod 28 is arranged between the second vertical connecting rod 23 and the cantilever basket beam 32. A cantilever guardrail folding beam 29 is arranged on the cantilever basket beam 32. The cantilever mobile track under-hanging beam bottom construction platform can be controlled to fold upwards through the control system 20, and the upper telescopic arm 21 and the lower telescopic arm can be jointly controlled to move the cantilever basket under-hanging beam upwards. The lateral extension and retraction of the retracted arm 22 can ensure that when the construction platform under the mobile cantilever track under-hanging beam bottom is moved, the construction platform can smoothly pass through the inclined cable 2. The cantilever basket longitudinal beam 32 is connected with the cantilever basket third cross beam 30. The upper ends of the third strengthening connecting vertical rod 34 and the fourth strengthening connecting vertical rod 44 are respectively connected to the cantilever basket longitudinal beam 32. The lower ends of the third strengthening connecting vertical rod 34 and the fourth strengthening connecting vertical rod 44 are respectively connected to the cantilever basket working platform connecting cross rod 37 and the cantilever basket working bottom platform 39. The third strengthening connecting vertical rod 34 and the fourth strengthening connecting vertical rod 44 are respectively connected to the cantilever basket working platform connecting cross rod 37 and the cantilever basket working bottom platform 39. 3. The cantilever basket working platform is connected with the diagonal rod 36 and the reinforced connecting cross rod 45 to strengthen the connection. The cantilever basket longitudinal beam 32 and the fourth reinforced connecting vertical rod 44 are reinforced by the second reinforced connecting diagonal rod 31. The cantilever basket working platform connecting cross rod 37 and the cantilever basket working bottom platform 39 are connected by the cantilever basket working platform connecting vertical rod 38. The cantilever basket side fixed fall chain connecting structure 35 is installed on the third reinforced connecting vertical rod 34 to strengthen the fixation on the side of the beam 16. Then, the cable end anchor position 40 is carried out to remove the old cable beam end anchor cup nut 41 and install the new cable beam end anchor cup nut 42.

[0038] It should be noted that the parts in this embodiment that are the same or similar to those in the first embodiment can be referenced to each other and will not be described in detail in this application.

[0039] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

Claims

1. A construction method for a comprehensive maintenance and reinforcement system for a multi-tower cable-stayed bridge, characterized in that: The following steps are involved: Step 1: Using the anchor tooth block platform in the tower as the support point, set up the tower support rotation span reduction support hanging combination tower steel construction platform, and then carry out the multi-tower cable-stayed bridge tower maintenance and reinforcement construction; Step 2: Install the outer tower sliding steel track along the main tower of the cable tower, install the outer tower steel track sliding steel system on the outer tower sliding steel track, and carry out the outer tower maintenance and reinforcement construction of the multi-tower cable-stayed bridge; Step 3. Repair and reinforcement of the anchorage position of the cable end at the bottom of the beam: lay a movable track at the predetermined position on the front of the beam, and set up a construction platform at the bottom of the beam hanging under the movable track of the bridge deck cantilever; remove the old anchor cup nut of the cable beam end and install the new anchor cup nut of the cable beam end at the anchorage position of the cable end. Step 4: Move the cantilevered movable track-mounted bottom beam construction platform to start the repair and reinforcement construction of the next bottom beam cable end anchorage position until all repair and reinforcement construction of the bottom cable end anchorage position of the multi-tower cable-stayed bridge is completed.

2. The construction method of the comprehensive maintenance and reinforcement system of a multi-tower cable-stayed bridge according to claim 1 is characterized in that: In step 1, the tower support rotates to reduce the span and hang the combined tower steel construction platform, including the tower construction platform support steel frame, the tower pattern plate construction platform and the tower construction platform guardrail. The tower construction platform support steel frame, the tower pattern plate construction platform and the tower construction platform guardrail are hoisted by the tower hoisting winch. The middle part of the construction platform support steel frame is the tower support rotation mechanism. The tower support rotation mechanism can be used to fold the tower construction platform support steel frame. After the construction platform support steel frame is folded, it can be hoisted in and out to the predetermined position. Open the rotating mechanism of the bracket inside the tower for installation, fix the supporting steel frame of the construction platform inside the tower as the load-bearing structure on the anchor tooth block platform inside the tower, cover the supporting steel frame of the construction platform inside the tower with the patterned plate construction platform inside the tower, fix the protective railings of the construction platform inside the tower around the patterned plate construction platform inside the tower, and then carry out the repair and reinforcement construction inside the tower of the multi-tower cable-stayed bridge; after the repair and reinforcement construction at one position inside the tower of the multi-tower cable-stayed bridge is completed, repeat the above steps to start the repair and reinforcement construction at the next position until all the repair and reinforcement construction inside the tower of the multi-tower cable-stayed bridge is completed.

3. The construction method of the comprehensive maintenance and reinforcement system for a multi-tower cable-stayed bridge according to claim 1 is characterized in that: In step two, the base of the outer tower sliding steel system is first installed near the main tower of the cable tower, and then the outer tower sliding steel track is installed along the main tower of the cable tower, and the outer tower steel track sliding steel system is installed on the outer tower sliding steel track. The outer tower steel track sliding steel system is provided with an upper and lower outer tower construction platform, and the outer tower construction platform protection system is installed around the outer tower construction platform. The outer tower construction platform driving system controls the tower outer steel track sliding steel system to run along the outer tower sliding steel track to the predetermined position, and then the outer tower maintenance and reinforcement construction of the multi-tower cable-stayed bridge is carried out.

4. The construction method of the comprehensive maintenance and reinforcement system of a multi-tower cable-stayed bridge according to claim 1 is characterized in that: In step three, a mobile track is laid at a predetermined position on the front side of the beam, and a mobile track running wheel is installed on the mobile track. The mobile track running wheel is vertically connected to a first vertical connecting rod and a second vertical connecting rod. The first vertical connecting rod and the second vertical connecting rod are horizontally connected through an upper telescopic arm and a lower telescopic arm. The lateral extension and contraction of the upper telescopic arm and the lower telescopic arm can be controlled by a control system. The upper telescopic arm and the first vertical connecting rod are connected through a first cross beam of a cantilever hanging basket, and the upper telescopic arm and the second vertical connecting rod are connected through a second cross beam of a cantilever hanging basket. An appropriate amount of matching is placed on the lower telescopic arm. In order to strengthen the stability of the bridge deck cantilever mobile track-mounted bottom beam construction platform, a cantilever basket beam front fixed fall chain connection structure is installed on the cantilever basket longitudinal beam inside the guardrail to strengthen and fix it on the front face of the beam, a first strengthening connecting diagonal rod is arranged between the second vertical connecting rod and the cantilever basket longitudinal beam, a cantilever guardrail folding beam is arranged on the cantilever basket longitudinal beam, the cantilever mobile track-mounted bottom beam construction platform is controlled to fold upwards through the control system, and the lateral extension and contraction of the upper telescopic arm and the lower telescopic arm are jointly controlled to make the cantilever mobile track-mounted bottom beam construction platform pass through the inclined cable.

5. The construction method of the comprehensive maintenance and reinforcement system of a multi-tower cable-stayed bridge according to claim 4 is characterized in that: The third cross beam of the cantilever basket is connected to the longitudinal beam of the cantilever basket, the upper ends of the third reinforced connecting vertical rod and the fourth reinforced connecting vertical rod are respectively connected to the longitudinal beam of the cantilever basket, and the lower ends of the third reinforced connecting vertical rod and the fourth reinforced connecting vertical rod are respectively connected to the cantilever basket working platform connecting cross rod and the cantilever basket working bottom platform through the cantilever basket working platform connecting cross rod, the middle of the third reinforced connecting vertical rod and the fourth reinforced connecting vertical rod are respectively connected through the third reinforced connecting diagonal rod, the cantilever basket working platform connecting diagonal rod and the reinforced connecting cross rod, the cantilever basket longitudinal beam is connected to the fourth reinforced connecting vertical rod through the second reinforced connecting diagonal rod, the cantilever basket working platform connecting cross rod and the cantilever basket working bottom platform are connected through the cantilever basket working platform connecting vertical rod, the cantilever basket side fixed fall chain connection structure is installed on the third reinforced connecting vertical rod to strengthen the fixation on the side of the beam, and then the construction of removing the old inclined cable beam end anchor cup nut and installing the new inclined cable beam end anchor cup nut at the inclined cable end anchor position is carried out.

6. The construction method of the comprehensive maintenance and reinforcement system for a multi-tower cable-stayed bridge according to claim 4 is characterized in that: After the construction of an anchoring position of an inclined cable end at the bottom of the multi-tower cable-stayed bridge is completed, the control system controls the cantilevered mobile track-mounted bottom beam construction platform to fold upward, and jointly controls the lateral extension and retraction of the upper telescopic arm and the lower telescopic arm to ensure that when the cantilevered mobile track-mounted bottom beam construction platform is moved, the mobile track walking wheels on the mobile track allow the construction platform to smoothly move through the inclined cable, and then start the maintenance and reinforcement construction of the next anchoring position of the inclined cable end at the bottom of the beam, repeat the above steps to start the maintenance and reinforcement construction of the next position, until all the maintenance and reinforcement construction of the anchoring position of the inclined cable end at the bottom of the multi-tower cable-stayed bridge is completed.

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