JP2812177B2 - Bridge pier construction method by slip form method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pier construction method for a bridge constructed in a mountainous area or the like by a slip form method.

[0002]

2. Description of the Related Art A concrete pier of a bridge generally has an RC structure. Conventionally, a scaffold is assembled, and an RC frame for assembling a formwork, assembling a reinforcing bar, placing concrete, and disassembling a formwork using a tower crane or the like. The construction method is adopted.

[0003]

The maximum height of an existing pier is about 79 m. Recently, however, a plurality of piers exceeding 100 m are planned for a road bridge in a mountainous area or the like.
When such a high pier is constructed by the conventional RC method, a large amount of rebar work is enormous, and it is necessary to install scaffolds and forms inside and outside because of the hollow cross section for weight reduction. A great deal of labor and time are required for the work of reinforcing bars, scaffolds and formwork, and it takes about twice as long as a pier having a normal height, and there is a problem that it is expensive.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to significantly reduce the work of reinforcing bars, eliminate the conventional internal and external scaffolding and formwork work, and provide a high pier. Sri that labor-saving construction, shortening the construction period, the low-cost attained
An object of the present invention is to provide a pier construction method using a foam forming method .

[0005]

In the present invention, a construction method is adopted in which the pier main body has an SRC structure mainly composed of steel, and a skeleton is constructed by slip foam using the steel for the main construction.

That is, in the pier of the present invention, the pier body having a hollow cross section has an SRC structure in which concrete and steel frames bear an axial load. The concrete and the axial steel frame bear all the load in the pier axial direction, and the horizontal steel frame placed between the axial steel frames secures the horizontal strength, and the axial and horizontal reinforcing bars control the surface cracks. Minimize necessary for restraint. These steel frames and rebars are pre-assembled as unit blocks, and the unit blocks are connected after being built.

According to the method of the present invention, the cross section is hollow.
With concrete and steel frames to bear the axial load
When constructing a bridge pier body with SRC structure, it takes care of the axial steel frame that bears the axial load of the pier and the horizontal strength
One horizontal assembled prior plan view rectangular frame steel blocks of directions steel Rutotomoni, viewed in the steel block
Extrapolating a square frame-shaped reinforcing bar, suspending a slip foam using the steel block, placing concrete while raising the slip foam, pre-assembling the steel block and the reinforcing bar, and raising the slip foam. The pier is constructed by repeating concrete placement in sequence.

[0008]

[Function] In the above configuration, concrete and the axial steel frame bear the axial load of the pier body, and the horizontal steel frame bears the horizontal strength, so that the rebar can be minimized. The rebar can be greatly reduced as compared with the RC structure of the above, and the rebar work requiring a large amount of work can be greatly reduced.

Concrete is continuously poured by a slip foam using a steel frame for permanent construction, and no special slip foam support member is required, and the conventional internal and external scaffolds and formwork are laid out. Work can be eliminated, and labor and labor can be saved.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention. This is 100m on the road bridge in the mountains
FIGS. 1 and 2 are longitudinal and transverse sectional views showing the pier, and FIGS. 3 and 4 are side and plan sectional views showing an example of a slip form. , FIG.
Is a schematic side view showing a construction procedure.

As shown in FIGS. 1 and 2, the pier body 1 is hollow in cross section, and has an axial steel frame 2 and a horizontal steel frame 3.
, A reinforcing bar 4 and concrete 5.

A plurality of axial steel frames 2 are made of H-shaped steel and are arranged at intervals on four sides of the cross section, and the axial steel frames 2 and concrete 5 bear all of the axial load of the pier. The horizontal steel frame 3 is made of angle iron and is composed of a horizontal steel frame 3a and a diagonal steel frame 3b arranged horizontally and diagonally between the axial steel frames 2.

The reinforcing bar 4 includes an axial reinforcing bar 4a and a lateral reinforcing bar 4b.
And the axial reinforcing bar 4a is considered as an assembling bar of the surface crack control and the lateral reinforcing bar 4b. The horizontal reinforcing bars 4b are the minimum reinforcing bars necessary for the restraining effect, and most of the steel materials necessary for securing the horizontal strength are the horizontal steel frames 3a and the oblique steel frames 3.
Expect b. Further, in order to secure toughness, the inner and outer reinforcing bars 4b, 4b are fixed with tie bars, for example, reinforcing bars having hooks at both ends (not shown).

The axial steel frame 2 and the lateral steel frame 3
Is a steel block A having a predetermined height assembled in advance, and after being built, these steel frame blocks are joined together by an appropriate method such as bolting or welding. Similarly, the reinforcing bar 4 is assembled in advance as a reinforcing bar panel B, and the reinforcing bar panels are joined by welding or the like. (See FIG. 5) As shown in FIGS. 3 and 4, the slip form 10 is a center core including an upper suspension gantry 11 installed on an upper part of a previously assembled steel block A and an inner formwork 12. 13
, A suspension frame 15 having an outer formwork 14, a suspension wire 16 for suspending the center core 13 and the suspension frame 15 from the upper suspension gantry 11, an internal suspension scaffold 17, an external suspension scaffold 18, and the like.

The suspension wire 16 has an upper end fixed to the upper suspension gantry 11 and a lower end attached to the center core 13 and the suspension frame 15 via a lift jack (center hole jack) 19. The gripping device of the lift jack 19 is extended to grasp the suspension wire 16, and the lift jack 19 is contracted to raise the center core 13 and the suspension frame 15.
By repeating this, the concrete 5 is continuously poured while the inner frame 12 and the outer frame 14 are continuously raised.

If the cross section of the pier has a taper that gradually decreases in the axial direction, the inner core 12 is attached to the center core 13.
Slidably inward and outward, and a suspension frame 1
5 is divided into four parts and combined so as to movably support the end of the suspension frame along the external slide truss 20 of the suspension frame 15 so that it can follow a change in cross section. The molds 12 and 14 are also divided so that they can cope with changes in the width direction.

In the case of a straight section having the same cross section in the axial direction of the pier, it goes without saying that an integral slip form requiring no adjustment can be used.

In the above configuration, the pier is constructed by the slip-form method as follows (see FIGS. 5 and 6).

(1) The steel block A is assembled on the foundation concrete 21 in advance. This assembly is performed to a height of, for example, 45 m (self-standing height of the tower crane) by using a commonly used lift-up type tower crane 22 or the like.

(2) Assemble the reinforcing bar panel B with the tower crane 22. Thereafter, as shown in FIG.
(Solid section, wall thickness change portion) is constructed by the total scaffold formwork method 24.

(3) The slipform 10 is suspended from the upper end of the already assembled steel block A, and concrete 5 is poured while the slipform 10 is continuously raised, and the intermediate pier C is placed on the pier base 23. To build.

(4) The stay 25 of the tower crane 22 is connected to the intermediate pier C, and the steel block A and the reinforcing panel B are assembled on the intermediate pier C by a height of, for example, 18 m. The slip form 10 is replaced and suspended from the new top, and the concrete 5 is poured while the slip form 10 is raised. After that, the pre-assembly of this steel block etc.
1 Concrete casting work by raising the slip form
It repeats every time it rises by 8 m, and works up to a predetermined height.

Although the above description has been given of a road bridge in a mountainous area, the present invention is not limited to this, and it goes without saying that the present invention can be applied to other high bridge piers.

[0024]

As described above, according to the present invention, the pier body having a hollow cross section has an SRC structure which bears the load in the pier axial direction with concrete and an axial steel frame. The following effects can be obtained because of the construction.

(1) Since the conventional reinforcing steel bar is replaced with a steel frame as much as possible, the amount of rebar work requiring a large amount of work can be reduced, and labor saving and rapid construction can be achieved.

(2) By using the steel frame and the reinforcing bar as a unit block, labor saving and speeding up can be achieved.

(3) Since concrete is continuously cast by the slip-form method, the process can be shortened, and the conventional internal and external scaffolding and formwork are eliminated.
Speed up. In addition, since the slip-form method uses a steel frame for permanent construction, it does not require a special slip-form support member, and can save labor and speed up work.

(4) By combining the above-mentioned adoption of the steel frame and the slip form method using the steel frame, it is possible to surely save labor, shorten the construction period, and reduce the cost even on a high pier.

(5) If the cross section of the pier is standardized, the slip form equipment can be diverted and the cost can be further reduced.

(6) Since a steel frame is used, it is easy to secure vertical construction accuracy.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a tall pier according to the present invention.

FIG. 2 is a cross-sectional view of a base of the high pier of FIG.

FIG. 3 is a side view showing an example of a slip foam used in the pier construction method according to the present invention.

FIG. 4 is a plan sectional view of the slip foam shown in FIG. 3;

FIG. 5 is a schematic side view showing a procedure of a pier construction method according to the present invention.

FIG. 6 is a schematic side view showing a procedure when the pier construction method according to the present invention is applied to a road bridge in a mountainous area.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Bridge main body 2 ... Axial steel frame 3 ... Lateral steel frame 3a ... Horizontal steel frame 3b ... Diagonal steel frame 4 ... Reinforcing bar 4a ... Axial reinforcing bar 4b ... Lateral reinforcing bar 5 ... Concrete A ... Steel frame block B ... Reinforcement panel C ... Intermediate pier DESCRIPTION OF SYMBOLS 10 ... Slip form 11 ... Upper suspension gantry 12 ... Inner frame 13 ... Center core 14 ... Outer frame 15 ... Suspension frame 16 ... Suspension wire 17 ... Internal suspension scaffold 18 ... External suspension scaffold 19 ... Lift jack 20 ... External slide truss 21 ... foundation concrete 22 ... tower crane 23 ... pier base 24 ... total scaffold formwork method 25 ... stay

Continued on the front page (72) Inventor Yasushi Murayama 2-191-1, Tobita-Shi, Chofu-shi, Tokyo Kashima Construction Co., Ltd. (72) Kumiko Suda 2-191-1, Tobita-Shi, Chofu-shi, Tokyo Kashima (72) Inventor: Kikuo Koseki, 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Kashima Corporation (72) Inventor: Akio Yamauchi 1-2-7, Moto-Akasaka, Minato-ku, Tokyo Kashima JP-A-3-125755 (JP, A) JP-A-60-78008 (JP, A) JP-A-6-257285 (JP, A) JP-A-5-280012 (JP) , A) JP-A-56-31911 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E01D 19/02 E04G 11/22

Claims (1)

(57) [Claims] (1) concrete and iron having a hollow cross section;
A bridge pier body with SRC structure that bears axial load with bone
When building, a plane consisting of an axial steel frame that bears the axial load of the pier and a horizontal steel frame that bears the horizontal strength
Ru assembled prior to rectangular frame steel block viewing the co
Next, a square frame-shaped reinforcing bar panel is attached to this steel block.
Extrapolating, suspending the slip form using the steel block, placing concrete while raising the slip form, sequentially repeating the pre-assembly of the steel block and the reinforcing bar panel and the concrete placement by raising the slip form. A pier construction method using a slip-form method characterized by constructing a pier.