A method for replacing horizontal tie cable of a through tied-arch bridge

Abstract

The application relates to a replacement construction method of a horizontal tie rod cable of a through tied arch bridge. A permanent tensioning working chamber is designed at the rear end of a main beam horizontal tie rod tensioning area of a bridge abutment, a large-tonnage jack and a temporary support pier are used at the approach bridge end to lift the approach bridge body as a whole to a certain height, and a large and small two sets of winches are arranged at the approach bridge end. The application can realize efficient and safe replacement of the horizontal tie rod under the premise that the abutment back is not dug and the structure of the approach bridge end is not damaged; the construction period is short, the operation is convenient, the cost is controllable, and meanwhile, the construction quality of the tie rod replacement is ensured.

Description

Technical Field

[0001] This invention relates to the field of bridge construction, and in particular to a method for replacing the horizontal tie cables of a tied arch bridge with under-deck construction. Background Technology

[0002] See Figure 1 The following drawbacks exist in replacing the horizontal tie cables of existing tied arch bridges with under-deck structures:

[0003] 1) The bridge abutment end is affected by the backfill behind the abutment, and the approach bridge end is restricted by the low space and the beam crossbeam, which makes it difficult to arrange construction equipment, and the cable movement trajectory is interfered with by the structure, making construction difficult to implement.

[0004] 2) The tensioning space reserved behind the main longitudinal beam at the abutment end is limited. After the back wall is constructed, the rear space is closed. When replacing the cable, it is necessary to excavate the backfill of the abutment and break the back wall to temporarily create a working space. The workload is large and the construction cost is high.

[0005] 3) The approach bridge end crossbeam structure affects or even obstructs the cable-passing path, and the cable body and the beam body are prone to scraping, resulting in damage to the PE protective layer, reducing the cable body life and affecting structural safety;

[0006] 4) After the cable replacement, the back wall needs to be re-poured and the abutment backfilled, which will result in a long construction period, long road closure time, and traffic disruption.

[0007] 5) During the dismantling of old cables, due to the influence of the cable path, it is often necessary to pull them out and cut them into shorter sections multiple times, which is cumbersome and inefficient.

[0008] Therefore, there is an urgent need for a construction method for replacing horizontal tie rods that requires no excavation of the abutment back, no damage to the approach bridge structure, high construction efficiency, and safety and reliability. Summary of the Invention

[0009] To address the aforementioned technical problems in the background art, this invention provides a method for replacing horizontal tie rods in a tied arch bridge with under-deck structure. This method enables efficient and safe replacement of horizontal tie rods without excavating the abutment back or damaging the approach bridge structure. It also achieves short construction period, convenient operation, controllable cost, and ensures the quality of tie rod replacement.

[0010] The technical solution of this invention is as follows: This invention provides a construction method for replacing the horizontal tie cables of a tied-arch bridge with under-deck construction, characterized by the following steps:

[0011] 1) During the bridge construction phase, a precast tensioning working chamber is constructed behind the horizontal tie rod tensioning zone of the main beam at the abutment end;

[0012] 2) During the replacement construction, temporary supports are set up under the approach bridge body, and temporary supports are erected on the temporary supports. The approach bridge body is then lifted to the predetermined height using jacks.

[0013] 3) Install the large and small winches at the approach bridge end; install the steering pulleys;

[0014] 4) Use tensioning equipment to release the old horizontal tie cable, remove the anchors at both ends of the old horizontal tie cable, and put the old horizontal tie cable in a stress-free free state;

[0015] 5) Connect the traction wire rope of the large winch to the end of the old horizontal tie rod at the approach bridge end, pull out the old horizontal tie rod, and form a cable passage; 6) The traction wire rope of the small winch is passed from the approach bridge end into the main beam cable guide tube, turns back through the steering pulley in the tensioning working chamber and enters the bottom of the beam, and then returns to the approach bridge end through the steering pulley at the bottom of the beam.

[0016] 7) Connect the traction wire rope of the small winch to the traction wire rope of the large winch at the approach bridge end, start the small winch to reverse the recovery, pull the traction wire rope of the large winch to the tensioning working chamber at the bridge abutment end, enter the beam through the steering pulley and return to the approach bridge end.

[0017] 8) Install the new horizontal tie rod cable onto the cable release reel, and connect the end of the new horizontal tie rod cable to the traction wire rope of the large winch;

[0018] 9) Start the large winch to thread the new horizontal tie rod cable;

[0019] 10) After the cable is threaded, tension and anchor the new horizontal tie rod cable to complete the replacement.

[0020] Furthermore, after step 10), there is also step 11), which involves replacing the cables one by one in sequence, repeating steps 4) to 9), to complete the replacement of all cables.

[0021] Furthermore, after step 11), step 12) is also included: the jacks are lowered, the approach bridge beams are lowered, and the construction is completed.

[0022] Furthermore, the tensioning working chamber is a concrete structure box chamber.

[0023] Furthermore, temporary supports are constructed using steel pipe columns or steel profile columns, with two or more sets up as needed for construction.

[0024] Furthermore, the lower part of the temporary support is a precast pipe column, and the upper part is equipped with short-section columns according to the jacking stroke, which are connected by flanges or welding.

[0025] Furthermore, there are multiple steering pulleys, arranged according to site conditions. Specifically, the first steering pulley is located at the bottom of the main beam at the approach bridge end, near the cable guide outlet of the main beam; the middle steering pulley is located below the under-bearing tied arch bridge; and the last steering pulley is located in the tensioning working chamber at the bridge abutment end.

[0026] Furthermore, large-tonnage intelligent lifting equipment is selected for the jacks.

[0027] Furthermore, large winches are selected based on traction requirements.

[0028] This invention provides a method for replacing the horizontal tie cables of a tied-arch bridge with under-deck construction. A permanent tensioning chamber is designed at the rear end of the horizontal tie cable tensioning zone of the main beam at the abutment end (to be completed during bridge construction). Large-tonnage jacks and temporary supports are used at the approach bridge ends to lift the entire approach bridge structure to a certain height. Simultaneously, two sets of winches, one large and one small, are arranged at the approach bridge ends. Therefore, this invention has the following advantages:

[0029] 1) In the process of replacing tie rods, the abutment back does not need to be excavated, and the approach bridge end structure remains intact, which is economical and efficient.

[0030] 2) The present invention has a fast construction speed, avoids backfill excavation, reduces operating costs, and reduces road interruption time caused by construction.

[0031] 3) The construction method of the present invention is simple, the equipment is universal and easy to obtain, and it has good promotional value. Attached Figure Description

[0032] Figure 1 This is a current view of the existing tied arch bridge with under-deck structure;

[0033] Figure 2 This is a schematic diagram of the lifting approach bridge main beam of the present invention;

[0034] Figure 3 This is a schematic diagram showing the installation of the winch and steering pulley in this invention;

[0035] Figure 4 This is a schematic diagram illustrating the process of pulling out the horizontal tie rod to be replaced according to the present invention;

[0036] Figure 5 This is a schematic diagram of the traction system formed by using a small winch to pull the wire rope of a large winch according to the present invention;

[0037] Figure 6 This is a schematic diagram illustrating the installation of the cable release disc, the operation of a large winch to pull the horizontal tie rod cable, and the tensioning and anchoring of the cable.

[0038] Figure 7 This is a schematic diagram showing the completed construction of the approach bridge beams according to the present invention.

[0039] The attached figures are labeled as follows:

[0040] 1. Temporary support piers; 2. Jacks or lifting equipment; 3. Large winches; 4. Cable release reel; 5. Traction wire rope; 6. New horizontal tie rods; 7. Steering pulleys; 8. Old horizontal tie rods; 9. Tensioning working chamber; 10. Small winches. Detailed Implementation

[0041] This invention provides a method for replacing horizontal tie cables in a tied-arch bridge with under-deck construction, specifically including the following steps:

[0042] 1) During the bridge construction phase, a precast tensioning working chamber is constructed behind the horizontal tie rod tensioning zone of the main beam at the abutment end;

[0043] 2) During the replacement construction, temporary supports are set up under the approach bridge body, and temporary supports are erected on the temporary supports. The approach bridge body is then lifted to the predetermined height using jacks.

[0044] 3) Install the large and small winches at the approach bridge end; install the steering pulleys;

[0045] 4) Use tensioning equipment to release the old horizontal tie cable, remove the anchors at both ends of the old horizontal tie cable, and put the old horizontal tie cable in a stress-free free state;

[0046] 5) Connect the traction wire rope of the large winch to the end of the old horizontal tie rod at the approach bridge end, pull out the old horizontal tie rod, and form a cable passage; 6) The traction wire rope of the small winch is passed from the approach bridge end into the main beam cable guide tube, turns back through the steering pulley in the tensioning working chamber and enters the bottom of the beam, and then returns to the approach bridge end through the steering pulley at the bottom of the beam.

[0047] 7) Connect the traction wire rope of the small winch to the traction wire rope of the large winch at the approach bridge end, start the small winch to reverse the recovery, pull the traction wire rope of the large winch to the tensioning working chamber at the bridge abutment end, enter the beam through the steering pulley and return to the approach bridge end.

[0048] 8) Install the new horizontal tie rod cable onto the cable release reel, and connect the end of the new horizontal tie rod cable to the traction wire rope of the large winch;

[0049] 9) Start the large winch to thread the new horizontal tie rod cable;

[0050] 10) After the cable threading is completed, tension and anchor the new horizontal tie cable to complete the replacement;

[0051] 11) Replace the cables one by one in sequence, repeating steps 4) to 9) to complete the replacement of all cables;

[0052] 12) The jacks were lowered, the approach bridge beams were lowered, and the construction was completed.

[0053] The tensioning working chamber is a concrete structure box chamber.

[0054] Temporary supports are constructed using steel pipe columns or structural steel columns, with two or more sets up as needed for construction. The lower part of the temporary support consists of precast pipe columns, while the upper part is fitted with short-segment columns according to the jacking stroke, connected by flanges or welding.

[0055] There are multiple steering pulleys, arranged according to site conditions. Specifically, the first steering pulley is located at the bottom of the main beam at the approach bridge end, near the cable guide outlet of the main beam; the middle steering pulley is located below the under-bearing tied arch bridge; and the last steering pulley is located in the tensioning working chamber at the bridge abutment end.

[0056] The jacks are made of large-tonnage intelligent lifting equipment.

[0057] Large winches are selected based on traction requirements.

[0058] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0059] In a specific application embodiment of the present invention, the specific construction steps are as follows:

[0060] 1) See Figure 2 Design and install temporary support 1. Temporary support 1 is made of steel pipe column. There are multiple temporary support 1, such as 4, which are symmetrically erected under both ends of the approach bridge. There are multiple jacks 2, such as 4, which are erected on the 4 temporary support 1. The jacks 2 gradually lift the approach bridge to the predetermined height.

[0061] 2) See Figure 3 Large winches 3 and small winches 10 are installed at the approach bridge end; steering pulleys 7 are arranged on site; the first steering pulley 7 is arranged at the bottom of the main beam at the approach bridge end near the cable guide outlet of the main beam, the middle steering pulley 7 is arranged under the under-bearing tied arch bridge, and the last steering pulley 7 is arranged in the tensioning working chamber 9 at the bridge abutment end.

[0062] 3) Use tensioning equipment to release the old horizontal tie cable 8, remove the anchorages at both ends of the old horizontal tie cable 8, so that the old horizontal tie cable 8 is in a stress-free state;

[0063] 4) See Figure 4 Connect the traction wire rope 5 of the large winch 3 to the end of the old horizontal tie rod cable 8 at the approach bridge end, start the large winch 3 to pull out the old horizontal tie rod cable 8, and form a cable passage.

[0064] 5) Pass the traction wire rope of the small winch 10 through the main beam cable guide to the tensioning working chamber 9 at the bridge abutment end, enter the bottom of the beam through the steering pulley 7, and then return to the approach bridge end through the steering pulley 7.

[0065] 6) See also Figure 5 Connect the traction wire rope of the small winch 10 to the traction wire rope 5 of the large winch 3, start the small winch 10 to reverse and retract it, and pull the traction wire rope 5 of the large winch 3 to the tensioning working chamber 9 at the bridge abutment end, enter the beam through the steering pulley 7 and return to the approach bridge end.

[0066] 7) See Figure 6 Install cable release plate 4, and place the new horizontal tie rod cable 6 on cable release plate 4 after it has been transported to the location.

[0067] 8) Connect the traction wire rope 5 of the large winch 3 to the new horizontal tie rod 6, and start the large winch 3 to thread the rope;

[0068] 9) After the cable threading is completed, tension and anchor the new horizontal tie cable 6;

[0069] 10) Replace the cables one by one in sequence, repeating steps 4) to 9) to complete the replacement of all cables;

[0070] 11) See Figure 7 The jacks were lowered twice, the approach bridge beams were lowered, and the construction was completed.

[0071] The technical contents of this invention and those not specifically described in the above embodiments are the same as those in the prior art.

[0072] The above are merely specific embodiments disclosed in this invention, but the scope of protection disclosed in this invention is not limited thereto. The scope of protection disclosed in this invention should be determined by the scope of the claims.

Claims

1. A method for replacing the horizontal tie cables of a tied-arch bridge with under-deck construction, characterized in that: The method includes the following steps: 1) During the bridge construction phase, a precast tensioning working chamber is constructed behind the horizontal tie rod tensioning zone of the main beam at the abutment end; 2) During the replacement construction, temporary supports are set up under the approach bridge body, and temporary supports are erected on the temporary supports. The approach bridge body is then lifted to the predetermined height using jacks. 3) Install the large and small winches at the approach bridge end; install the steering pulleys; 4) Use tensioning equipment to release the old horizontal tie cable, remove the anchors at both ends of the old horizontal tie cable, and put the old horizontal tie cable in a stress-free free state; 5) Connect the traction wire rope of the large winch to the end of the old horizontal tie rod at the approach bridge end, pull out the old horizontal tie rod, and form a cable passage; 6) The traction wire rope of the small winch is passed from the approach bridge end into the main beam cable guide tube, turns back through the steering pulley in the tensioning working chamber and enters the bottom of the beam, and then returns to the approach bridge end through the steering pulley at the bottom of the beam. 7) Connect the traction wire rope of the small winch to the traction wire rope of the large winch at the approach bridge end, start the small winch to reverse the recovery, pull the traction wire rope of the large winch to the tensioning working chamber at the bridge abutment end, enter the beam through the steering pulley and return to the approach bridge end. 8) Install the new horizontal tie rod cable onto the cable release reel, and connect the end of the new horizontal tie rod cable to the traction wire rope of the large winch; 9) Start the large winch to thread the new horizontal tie rod cable; 10) After the cable is threaded, tension and anchor the new horizontal tie rod cable to complete the replacement.

2. The method for replacing the horizontal tie cables of a tied-arch bridge according to claim 1, characterized in that: Step 10) is followed by step 11) replacing the cables one by one in sequence, repeating steps 4) to 9) to complete the replacement of all cables.

3. The method for replacing the horizontal tie cables of a tied-arch bridge according to claim 2, characterized in that: Step 11) is followed by step 12) where the jacks are lowered, the bridge beams are lowered, and the construction is completed.

4. The method for replacing the horizontal tie cables of a tied-arch bridge according to any one of claims 1 to 3, characterized in that: The tensioning working chamber is a concrete structure box chamber.

5. The method for replacing the horizontal tie cables of a tied-arch bridge according to claim 4, characterized in that: The temporary supports are made of steel pipe columns or steel profile columns, and two or more are set up as needed for construction.

6. The method for replacing the horizontal tie cables of a tied-arch bridge according to claim 5, characterized in that: The lower part of the temporary support is a precast pipe column, and the upper part is equipped with short-section columns according to the jacking stroke, which are connected by flanges or welding.

7. The method for replacing the horizontal tie cables of a tied-arch bridge according to claim 6, characterized in that: The steering pulleys are multiple and arranged according to the site conditions. Specifically, the first steering pulley is located at the bottom of the main beam at the approach bridge end, near the cable guide outlet of the main beam; the middle steering pulley is located below the under-bearing tied arch bridge; and the last steering pulley is located in the tensioning working chamber at the bridge abutment end.

8. The method for replacing the horizontal tie cables of a tied-arch bridge according to claim 7, characterized in that: The jacks used are large-tonnage intelligent lifting equipment.

9. The method for replacing the horizontal tie cables of a tied-arch bridge according to claim 8, characterized in that: The large winch is selected based on the traction requirements.

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