CN106758767A - A kind of suspension bridge segmented cat road and its construction method - Google Patents

Abstract

The invention discloses a segmented catwalk of a suspension bridge and a construction method thereof, relating to the field of suspension bridge construction, which is used to connect two main towers respectively located on both sides of the main span of the suspension bridge and anchorages located on both sides of the suspension bridge. Each side is fixed with a first anchoring device, and the two first anchoring devices of the same main tower are connected by a tensioning device embedded in the main tower, and the two first anchoring devices opposite to each other are connected with a The main span load-bearing cable; the second anchoring device is provided on the anchorage, and the side-span load-bearing cable is connected between the second anchoring device and the first anchoring device of the opposite main tower.

Description

A segmented catwalk of a suspension bridge and its construction method

The invention relates to the field of suspension bridge construction, in particular to a segmented catwalk for a suspension bridge and a construction method thereof.

Background technique

The construction catwalk of the suspension bridge is a high-altitude scaffold erected under the main cable and arranged parallel to the main cable to allow construction personnel to carry out construction work. , Saddle shaping, cable tightening, cable clamp and sling installation, main girder hoisting and site connection, main cable winding, protective coating and other important tasks. At present, the load-bearing cables of the catwalk used in the construction of the suspension bridge are continuous between the anchorage on both sides and the main tower. By setting the steering cable saddle on the top of the tower to cross the main tower structure, since the load-bearing cable needs to cross the top area of the main tower, at the same time In order to ensure that the catwalk load-bearing cables meet the design requirements on both sides of the main tower, load-bearing cable pull-down devices need to be installed on both sides of the main tower, making the structure of the catwalk in the main tower area complex, the working space is narrow, and the construction of the main cable strands is difficult. Convenience; in addition, because a single load-bearing cable is only provided with a linear cable adjustment device at the anchorage position on both banks, and at the same time there are pull-down devices on both sides of the main tower, it is difficult to adjust the linear shape of the load-bearing cable during installation and use. It is also inconvenient to hang and remove.

Contents of the invention

Aiming at the defects existing in the prior art, the object of the present invention is to provide a segmented catwalk of a suspension bridge and its construction method, so that the load-bearing cables of the catwalk of the suspension bridge can be quickly and conveniently adjusted in alignment and later dismantled during installation and use. , while simplifying the layout of the catwalk at the top of the tower to facilitate related construction operations.

For achieving above object, the technical scheme that the present invention takes is:

A segmented catwalk of a suspension bridge, which is used to connect two main towers located on both sides of the main span of the suspension bridge and anchorages located on both sides of the suspension bridge,

A first anchoring device is fixed on both sides of the main tower, and the two first anchoring devices of the same main tower are connected by a tensioning device embedded in the main tower. There is a main span load-bearing cable connected between the anchorage devices;

The anchor is provided with a second anchoring device, and a side span load-bearing cable is connected between the second anchoring device and the first anchoring device of the main tower opposite to it.

On the basis of the above technical solution, the main span load-bearing cables next to the first anchoring device and the side-span load-bearing cables next to the second anchorage device are equipped with cable adjustment devices for adjusting the line shape of the load-bearing cables.

On the basis of the above-mentioned technical solution, the said tensioning device is a tensioning finish-rolled threaded steel bar pre-buried in the main tower.

The present invention also provides a construction method for the sectioned catwalk of the above-mentioned suspension bridge, which comprises the following steps:

S1. Install the main cable saddles on the main towers on both sides of the suspension bridge, and loose cable saddles on the anchorages on both sides; then install the tower top gantry, loose cable saddle gantry, first anchor device, second anchor device and cable adjustment device ;

S2. Erection of the pilot cable to form a one-way reciprocating traction system. Using this traction system, first install two side span load-bearing cables, then install the main span load-bearing cables, and finally install the portal cable and the traction cable;

S3. Install catwalk load-bearing cable displacement steel frame structure, catwalk surface structure and horizontal bridge structure.

On the basis of the above technical solution, when the first anchoring device is installed, the pulling device is pre-tensioned by setting.

On the basis of the above technical solution, the linear adjustment of the load-bearing cables of the main span and the load-bearing cables of the side spans is carried out separately.

On the basis of the above technical solution, the step S2 also includes adjusting the line shape of the pilot cable to the design line shape in the state of empty cable through the cable adjustment device.

On the basis of the above technical solution, the step S3 also includes adjusting the alignment of the main-span load-bearing cables and the side-span load-bearing cables to the designed positions through the cable adjustment device.

Compared with the prior art, the present invention has the advantages of:

(1) In the segmented catwalk of the present invention, the load-bearing cables of the catwalk are disconnected at the main tower, and the side-span and mid-span load-bearing cables can be installed and debugged separately, so that the load-bearing cables are less affected by the temperature and the length of the blanking material, and the on-site construction Simple organization, high construction efficiency, strong applicability and economy.

(2) In the segmented catwalk of the present invention, the load-bearing cables of the catwalk are disconnected at the main tower, which greatly simplifies the catwalk cable erection and alignment adjustment process, shortens the erection time, saves the engineering cost, and makes the tower top layout simpler , to facilitate the erection of the main cable strands of the suspension bridge. At the same time, it is more convenient to dismantle the catwalk structure in the later stage. At the same time, it is more convenient to adjust the line shape of the catwalk load-bearing cables during installation and use.

Description of drawings

Fig. 1 is the structural representation of suspension bridge section catwalk in the embodiment of the present invention;

Fig. 2 is the schematic structural view of the catwalk at the side span anchorage position in the embodiment of the present invention;

Fig. 3 is the structural representation of catwalk at the top of main tower in the embodiment of the present invention;

Fig. 4 is the schematic diagram of construction step S1 in the embodiment of the present invention;

Fig. 5 is the schematic diagram of construction step S2 in the embodiment of the present invention;

Fig. 6 is the schematic diagram of construction step S3 in the embodiment of the present invention;

In the figure: 1-main tower, 2-anchor, 3-main span load-bearing cable, 4-side span load-bearing cable, 5-first anchoring device, 501-pair pull device, 6-second anchoring device, 7-adjustment Cable device, 8-pilot cable, 9-gantry cable, 10-drawing cable, 11-tower gantry, 12-scattering saddle gantry.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

Referring to Fig. 1 to Fig. 3, an embodiment of the present invention provides a segmented catwalk of a suspension bridge, which is used to connect two main towers 1 located on both sides of the main span of the suspension bridge and anchorages 2 located on both sides of the suspension bridge,

A first anchoring device 5 is fixed on both sides of the main tower 1, and the two first anchoring devices 5 of the same main tower are connected by a tensioning device 501 embedded in the main tower 1. A main span load-bearing cable 3 is connected between the two opposite first anchoring devices 5;

The anchorage 2 is provided with a second anchoring device 6, and a side span load-bearing cable 4 is connected between the second anchoring device 6 and the first anchoring device 5 of the main tower 1 opposite to it.

The segmental catwalk of the suspension bridge of the present invention can also be provided with several cable adjustment devices 7, and the cable adjustment devices 7 can be arranged on the main span load-bearing cables 3 next to the first anchor device 5 and the side spans next to the second anchor device 6 On the load-bearing cable 4, by tensioning or relaxing the load-bearing cable, the fixed load-bearing cable line shape is adjusted. By arranging the cable adjusting device 7 , the line shape of the load-bearing cable can be adjusted under the condition that the main-span load-bearing cable 3 and the side-span load-bearing cable 4 have been anchored, so as to facilitate the construction operation.

The tensioning device 501 between the two first anchoring devices 5 of the same main tower 1 can be set as a tensioning finish-rolled threaded steel bar pre-embedded in the main tower 1, and fixedly connected, further strengthening the main span load-bearing cable 3 The fixed structure of the side-span load-bearing cables 4 and the main tower 1 ensures its tensile bearing capacity, thereby enhancing the stability of the suspension bridge structure.

In the segmented catwalk of the present invention, the load-bearing cable of the catwalk is disconnected at the main tower 1, and the side-span load-bearing cable 3 and the mid-span load-bearing cable 4 can be installed and debugged separately, so that the load-bearing cable is less affected by the temperature and the length of the blanking material. The on-site construction organization is simple, the construction efficiency is high, and it has strong applicability and economy.

The embodiment of the present invention also provides a construction method for the segmental catwalk of the aforementioned suspension bridge, which will be described in detail step by step below:

Referring to Fig. 4, first install the main cable saddles on the main towers 1 on both sides of the suspension bridge, and install the loose cable saddles on the anchorages 2 on both sides; then install the tower top gantry 11, the loose cable saddle gantry 12, and the first anchoring device 5. The second anchoring device 6 and the cable adjusting device 7;

As shown in Figure 5, the second step is to erect the pilot cable 8 to form a one-way reciprocating traction system. Using this traction system, first install two side span load-bearing cables 4, then install the main span load-bearing cables 3, and finally install the door frame Cable 9 and traction cable 10;

In this step, the line shape of the catwalk cable can also be adjusted to the design line shape under the empty cable state through the cable adjustment device 7 .

As shown in Figure 6, the third step is to install the catwalk load-bearing cable displacement steel frame structure, catwalk surface structure and horizontal bridge structure.

During construction, the first anchoring device 5 can be pre-tensioned by setting the tensioning device 501 to ensure its tensile bearing capacity and make the suspension bridge structure more stable.

When adjusting the alignment of the load-bearing cables during construction, the alignment adjustments of the main-span load-bearing cables 3 and the side-span load-bearing cables 4 are performed separately without interfering with each other. While simplifying the construction difficulty, it also improves the construction efficiency.

In the second step of construction, the line shape of the pilot cable 8 can be adjusted to the design line shape under the empty cable state through the cable adjustment device 7 .

In the third step of construction, the line shape of the main span load-bearing cables 3 and side-span load-bearing cables 4 can be adjusted to the design positions by using the cable adjustment device 7 .

The present invention is not limited to the above-mentioned embodiments. For those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also considered protection of the present invention. within range. The content not described in detail in this specification belongs to the prior art known to those skilled in the art.

Claims (8)

1. a suspension bridge segmented catwalk, which is used to connect two main towers (1) positioned at both sides of the main span of the suspension bridge and anchorages (2) positioned at the both sides of the suspension bridge, is characterized in that: A first anchoring device (5) is respectively fixed on both sides of the main tower (1), and the two first anchoring devices (5) of the same main tower are passed through a tensioning device ( 501) connection, a main span load-bearing cable (3) is connected between two relative first anchoring devices (5) between the two main towers (1); The anchorage (2) is provided with a second anchoring device (6), and is connected between the second anchoring device (6) and the first anchoring device (5) of the main tower (1) opposite to it. Side span load-bearing cables (4). 2. The segmented catwalk of suspension bridge as claimed in claim 1, characterized in that: the main span load-bearing cables (3) next to the first anchoring device (5) and the ones next to the second anchoring device (6) The side-span load-bearing cables (4) are all provided with a cable-adjusting device (7) for adjusting the line shape of the load-bearing cables. 3. The segmental catwalk of the suspension bridge according to claim 1, characterized in that: the said tensioning device (501) is a tensioning finish-rolled threaded steel bar pre-buried in the main tower (1). 4. a construction method of suspension bridge segmented catwalk as claimed in claim 2 or 3, is characterized in that, comprises the following steps in the method: S1. Install the main cable saddles on the main towers (1) on both sides of the suspension bridge, and install loose cable saddles on the anchorages (2) on both sides; then install the tower top gantry (11), loose cable saddle gantry (12), the second An anchoring device (5), a second anchoring device (6) and a cable adjusting device (7); S2. Erection of the pilot cable (8) to form a one-way reciprocating traction system, using the traction system to first install two side span load-bearing cables (4), then install the main span load-bearing cables (3), and finally install the mast cable (9) and towing rope (10); S3. Install catwalk load-bearing cable displacement steel frame structure, catwalk surface structure and horizontal bridge structure. 5. The construction method of the segmented catwalk of the suspension bridge according to claim 4, characterized in that: when the first anchoring device (5) is installed, pre-tensioning is carried out by setting the pulling device (501). 6. The construction method of the sectioned catwalk of the suspension bridge according to claim 4, characterized in that: the linear adjustment of the main span load-bearing cables (3) and the side-span load-bearing cables (4) is carried out respectively. 7. The construction method of the sectioned catwalk of the suspension bridge according to claim 4, characterized in that: said step S2 also includes adjusting the line shape of the pilot cable (8) to the state of the empty cable through the cable adjustment device (7) Design linear. 8. the construction method of suspension bridge segmented catwalk as claimed in claim 4, is characterized in that: also comprise in the described step S3, main span load-bearing cable (3) and side span load-bearing cable (3) and side span load-bearing cable are respectively connected by cable adjustment device (7) Cable (4) is linearly adjusted to the design position.