JPH0820910A - Construction method of PC cable stayed bridge - Google Patents

Abstract

(57) [Summary] [Purpose] In the construction method of PC cable-stayed bridges, conventionally, girder heads were constructed independently, but construction was carried out prior to the anchorage section of the diagonal cable of the main tower block. Provide a construction method that shortens the construction period. [Structure] A part of the corbel block and a part of the lower main tower block are constructed, an upper main tower block and a lower horizontal beam are constructed, and at the same time a main girder head is constructed, and further, an anchoring block on the main tower side. The construction method of the PC cable-stayed bridge, which is repeated by constructing up to the upper main tower, assembling the wagon on the main girder column head, and constructing the anchoring part that becomes the diagonal cable of the main girder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction method for a main tower and a main girder of a PC cable-stayed bridge.

[0002]

2. Description of the Related Art Conventionally, (1) as shown in FIG. 5, a block of corbel parts C1 to C4 is first constructed.

(2) Next, as shown in FIG. 6, a corbel portion C5 and main girder column heads H1 and H2 are installed. The main girder column heads H1 and H2 serve as a space for assembling a wagon (work erection vehicle).

(3) Next, as shown in FIG. 7, a frame scaffold 2 is erected on the main girder heads H1 and H2, and main towers T1 and T
Build block 2.

(4) Next, as shown in FIG. 8, the frame scaffold 2
And the blocks of the main towers T3 to T6 and the lower horizontal beams are constructed.

(5) Next, as shown in FIG.
Build a block of T9. In the case of this example, the main tower T9 serves as a fixing block for the first diagonal cables B1 and B2. Generally, the fixing position of the first diagonal cables B1 and B2 is usually located considerably above the main tower. Further, the wagens W1 and W2 are assembled and the blocks of the main girders K1 and K2 are constructed. Here, the main girders K1 and K2 are fixing blocks on the girder side of the first-stage diagonal cables B1 and B2.

(6) As shown in FIG. 10 below, the construction of the main tower and the construction of the main girder block by the movement of the wages W1 and W2 are carried out in parallel and the tensions of the diagonal cables B3 and B4 are repeated to construct the cable-stayed bridge. Was building.

[0008]

As described above, in the erection erection method for the PC cable-stayed bridge, the main girder is erected while the diagonal cable is erected, so the construction is not completed up to the anchoring block of the main tower. And I could not start the main girder construction.

It is an object of the present invention to provide a method of constructing a slant cable of a main tower block in advance by fixing it to a fixing portion to shorten the construction period.

[0010]

[Means for Solving the Problem] In a PC cable-stayed bridge, a part of the block of the corbel part and a block of the lower main tower part are constructed, and the frame scaffolding is re-established so that the upper main tower block and the lower horizontal beam are installed. At the same time as the construction, construct the main girder head, and also construct up to the upper main tower which will be the anchoring block on the main tower side,
Assembling the wagon on the main girder column head, constructing the fixing part that will be the first diagonal cable of the main girder, tensioning the first diagonal cable, and tensioning the diagonal cable while repeating the construction of the main tower and the main girder at the same time. Build a cable-stayed bridge.

[0011]

EXAMPLES Examples will be described below with reference to FIGS.

First, (1) in FIG. 1, the block C of the corbel portion
1 to C5 and blocks T1 and T2 of the main tower are constructed.

(2) Next, in FIG. 2, the frame scaffolding is refilled and blocks T3 to T6 of the main tower and the lower horizontal beams are constructed.
At the same time, the main girder stigmas H1 and H2 are constructed.

(3) Next, the main towers T7 to T9 are constructed in FIG. 3, and the block T9 in the main tower portion is used as the fixing portion on the main tower side. Further, the wagens W1 and W2 are assembled, the fixing portions K1 and K2 of the first diagonal cables B1 and B2 of the main girder are installed, and the diagonal cables are tensioned.

(4) A cable-stayed bridge is constructed by tensioning a diagonal cable while repeating construction of a main tower and a main girder at the same time.

[0016]

According to the present invention, since the main tower, which is the anchoring portion for the cable-stayed material, is constructed at the same time as the construction of the main girder column head, the construction period is shortened by the number of construction days of the main girder column head separately constructed as in the conventional case. To be done. Table 1 shows the average shortened days.

[0017]

[Table 1]

[Brief description of drawings]

FIG. 1 is a diagram of constructing blocks C1 to C5 of a corbel portion and blocks T1 and T2 of a main tower portion.

[Fig. 2] Block T3 of the main tower after the frame scaffolding was replaced
~ T6 and lower cross beam are installed, and at the same time, main girder column heads H1, H
It is a figure which builds 2.

[Fig. 3] Construction of main towers T7 to T9, block T of the main tower
9 is the fixing section on the main tower side. Further, the wagons W1 and W2 are assembled to fix the fixing portion K of the first diagonal cable B1 and B2 of the main girder.
It is a figure which tensions a diagonal cable by constructing No. 1 and K2.

FIG. 4 is a diagram in which a cable-stayed bridge is constructed by tensioning a diagonal cable while repeating construction of a main tower and a main girder at the same time.

FIG. 5 is a diagram in which blocks of corbel parts C1 to C4 are first constructed by a conventional method.

[Fig. 6] Corbel part C5 and main girder head H by the conventional method
It is a figure which constructs 1 and H2.

FIG. 7 is a view in which the frame scaffolding 2 is installed on the main girder column heads H1 and H2 and the blocks of the main towers T1 and T2 are constructed by the conventional method.

FIG. 8 is a diagram in which the blocks of the main towers T3 to T6 and the lower horizontal beams are constructed by refilling the framework scaffold 2 by a conventional construction method.

FIG. 9: Construct blocks of the main towers T7 to T9 by a conventional method. In the case of this example, the main tower T9 serves as a fixing block for the first diagonal cables B1 and B2. Further Wagen W
1 and W2 are assembled and the blocks of the main girders K1 and K2 are constructed. Here, the main girders K1 and K2 are the diagonal cable B of the first stage.
FIG. 3 is a diagram illustrating a fixing block on the digit side of 1 and B2.

[Fig. 10] Construction of the main tower and wagons W1, W by the conventional method
It is a figure which constructs a cable-stayed bridge by repeating construction of the main girder block by moving 2 and tensioning the diagonal cable B3, B4 repeatedly.

[Explanation of symbols]

1 ... Bracket, 2 ... Frame scaffolding, 3 ... Supporting work, B1, B2 ... First stage diagonal cable, B3, B4
... Second-stage diagonal cable, C1-C5 ... Corbel parts 1-5, H1, H2 ... Main girder column head, K1, K2 ...
..Main girders, T1-T9 ... Main towers 1-9, W1, W2
..Wagen

Claims (1)

[Claims] 1. In a PC cable-stayed bridge, a part of the block of the corbel part and a block of the lower main tower part are constructed, and the frame scaffolding is re-established to construct the main tower block of the upper stage and the lower horizontal beam at the same time. After constructing the girder pillar head, further constructing up to the upper main tower that will be the anchoring block on the main tower side, assembling the wagon on the main girder pillar head and constructing the anchoring part that will be the first diagonal cable of the main girder, A construction method for a PC cable-stayed bridge, characterized in that the cable-stayed bridge is constructed by tensioning the cable diagonally and simultaneously tensioning the cable diagonally while repeating the construction of the main tower and main girder.