JP3952843B2

JP3952843B2 - Construction method of tower structure

Info

Publication number: JP3952843B2
Application number: JP2002139853A
Authority: JP
Inventors: 大輔石松; 淳高橋
Original assignee: 鹿島建設株式会社
Priority date: 2002-05-15
Filing date: 2002-05-15
Publication date: 2007-08-01
Anticipated expiration: 2022-05-15
Also published as: JP2003328323A

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for constructing an inverted Y-shaped tower structure such as a main tower of a cable-stayed bridge.
[0002]
[Prior art]
When constructing an inverted Y-shaped main tower of a cable-stayed bridge, conventionally, a so-called climbing form 50 and a tower crane 51 have been mainly used as shown in FIG. The inverted Y-shaped main tower 1 has a pair of left and right main tower bases 2 and 2 across the main girder, and two pillars that stand upright so as to approach each other from the main tower bases 2 and 2 The main tower central part 3 composed of the parts 3a and 3a, the main tower coupling part 4 where the two column parts 3a and 3a are combined, the main tower top part 5 projecting upward from the main tower coupling part 4 and the like. It was constructed according to the following procedure.
[0003]
(1) The main tower base 2 will be constructed with a ground crane and a total scaffold construction method.
(2) The climbing form 50 and the tower crane 51 are assembled, the climbing form 50 is sequentially raised by the climbing device, and each lot of the pillar portion 3a is sequentially constructed. The tower crane 51 is for carrying in a pre-embedded steel frame or main bar for attaching a climbing device (center hole jack, high-strength screw rebar, etc.). Sequentially add and extend. The mast portion 51a is supported by a stay (wall connection) 52 on the existing column portion 3a. Further, the existing pillar portions 3 a and 3 a are connected by a horizontal strut 53.
(3) When the construction of the central part 3 of the main tower is completed, the climbing form 50 is dismantled, the bracket 54 is attached to the upper part of the central part 3, and the main tower connection part 4 is constructed by the total scaffold method, followed by the total scaffold method. Then, each lot of the main tower top 5 is constructed in sequence.
[0004]
[Problems to be solved by the invention]
However, in the conventional construction method as described above, the tower crane is extended along the main tower, so that the stay becomes longer as the stay moves upward, and the cost of equipment accompanying the construction of the main tower increases. There was a point.
[0005]
The present invention has been made to solve such problems, and the purpose thereof is to eliminate the stay of the tower crane in the middle of the tower when constructing the inverted Y-shaped tower structure, An object of the present invention is to provide a method for constructing a tower-like structure capable of reducing the equipment cost associated with tower construction.
[0006]
[Means for Solving the Problems]
Claim 1 of the present invention is a tower-like structure in which the two column portions are inclined and arranged so as to approach each other from the base portion, and the top portion protrudes from the joint portion of the two column portions. This is a construction method, and a tower crane is installed at the both ends of the climbing gantry that has a formwork of two pillars and is stretched over the two pillars in a minimum state where no mast is added. The construction of the two pillars is carried out sequentially by carrying in and the climbing of the climbing gantry, and after the two pillars are joined, the mast is added to the tower crane and the top part is attached by the total scaffolding method or the formwork. It is the construction method of the tower-like structure characterized by constructing.
[0007]
According to claim 2 of the present invention, in the construction method according to claim 1, a push-up type climbing device is provided on the lower surfaces of both ends of the climbing gantry to push up the climbing gantry by taking a reaction force against the existing tower body. A tower-like structure construction method characterized in that a formwork and a scaffold are provided on a climbing gantry so as to be laterally movable.
[0008]
The present invention is effectively applied to the construction of an inverted Y-shaped main tower of a cable-stayed bridge, for example. The climbing gantry consists of a truss girder that is rectangular in plan view with a maximum width of two pillars that narrows upward, that is, a size that can surround the base, and is connected to the two pillars via a climbing device. Mounted and raised by climbing device.
[0009]
The climbing device is a push-up type climbing device including a push-up member such as a push-up beam and a push-up device such as a push-up jack. The climbing device pushes up the climbing gantry by taking a reaction force on the existing towers such as two pillars. Further, the push-up member is connected to the lower surface of the climbing gantry so as to be laterally movable in the tower width direction via a lateral pushing device such as a lateral pushing jack so as to correspond to the inclination of the two column portions. The formwork and scaffolding are placed on a carriage that can move in the tower width direction, for example, on the upper surface of the climbing gantry, and can be moved laterally by a lateral pushing device such as a lateral pushing jack to cope with the inclination of the two pillars. Has been.
[0010]
After constructing the base with the total scaffold construction method, assemble the climbing gantry on the base, carry in the material with the tower crane in the minimum state where the masts at both ends of the climbing gantry are not added, place the concrete, 1 When the construction of the lot is completed, the climbing gantry is raised by one lot, and the two steps are constructed by sequentially repeating the above steps.
[0011]
When the construction of the two pillars is completed before the joint part of the pillar part, the joint part is constructed by the total scaffold construction method, and then the cranes at both ends of the climbing gantry are extended upward by adding unit masts. While constructing the top with the total scaffold construction method. In this total scaffold construction method, the climbing gantry may be removed, and the bracket may be used as the base of the tower crane instead. Further, not only the total scaffold construction method, but also the construction of the connecting portion and the top portion can be performed using the climbing gantry and the formwork as they are.
[0012]
According to the construction method of the present invention, when the inverted Y-shaped tower structure is constructed, the tower crane is mounted on the climbing gantry in the minimum state in the construction of the intermediate portion of the tower. When the total scaffolding method is used for the upper part of the tower, the length of the stay can be shortened in the construction of the top of the tower, and the equipment cost associated with the construction of the main tower can be reduced. In addition, a push-up type climbing device consisting of a push-up member such as a push-up beam and a push-up device such as a push-up jack is provided on the lower surface of the climbing gantry, and the formwork and scaffolding are provided on the upper part so that it can be moved laterally. And can be done quickly.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on an embodiment shown in the drawings. This embodiment is an example applied to an inverted Y-shaped main tower of a cable-stayed bridge. 1, 2, and 3 are a front view, a plan view, and a side view showing a starting state of a middle portion of the main tower of the construction method of the present invention. FIG. 4 is a front view showing from the start state to the end state of the middle part of the main tower. FIG. 5 is a front view showing a construction state from the main tower coupling part to the main tower top part.
[0014]
As shown in FIG. 1, the inverted Y-shaped main tower 1 has a pair of left and right main tower bases 2 and 2 sandwiching the main girder and is inclined so as to approach each other from the main tower base parts 2 and 2. A main tower central portion 3 composed of two pillar portions 3a, 3a provided, a main tower coupling portion 4 where the two pillar portions 3a, 3a are united, and a main projecting upward from the main tower coupling portion 4 Consists of a tower top 5, and in the present invention, two pillars 3a and 3a are constructed using a climbing gantry 10 and tower cranes 11 at both ends thereof (climbing foam construction range A: FIG. 1 and FIG. 1). 4) After joining the two pillars, the tower crane 11 is extended to construct the main tower top 5 (upper construction range: see FIG. 5).
[0015]
As shown in FIGS. 1 to 3, the climbing gantry 10 includes a rectangular truss girder 12 and a push-up type climbing device 13 in a plan view having a size capable of surrounding a pair of left and right main tower bases 2 and 2. . The push-up climbing device 13 includes, for example, a push-up beam 13a and a push-up jack 13b. The push-up climbing device 13 raises the truss girder 12 by taking a reaction force on the outer surface of the existing main tower base or column. The push-up beam 13a and the push-up jack 13b are attached to the lower surface of the truss girder 12 so as to be laterally movable in the main tower width direction by a lateral push jack or the like, so as to cope with the inclination of the column portion 3a.
[0016]
Forms 20 and scaffolds 21 are installed on the upper surfaces of both ends of the truss girder 12, the formwork 20 rises one lot at a time together with the climbing gantry 10, and the two pillar portions 3a and 3a are sequentially constructed for one lot. Is done. These molds 20 and scaffolds 21 are mounted on, for example, a carriage and can be moved laterally in the width direction of the main tower by a lateral push jack or the like so as to cope with the inclination of the column part 3a.
[0017]
The tower crane 11 is installed outside the formwork 20 and the scaffolding 21 at both ends of the truss girder 12 and carries in materials such as reinforcing bars that precede the formwork 20. The tower crane 11 is installed in a minimum state where no mast is added, and as shown in FIG. 4, the tower crane 11 is lifted together with the climbing gantry 10 to perform crane work. Moreover, the tower crane 11 is moved and fixed to the main tower side corresponding to the column part 3a which inclines.
[0018]
As shown in FIG. 5, when the climbing gantry 10 rises to the front of the main tower coupling portion 4, a scaffold is assembled on the truss girder 12, and the main tower coupling portion 4 is constructed by a total scaffold construction method. Subsequently, a unit mast is added to the lower part of the tower crane 11, and a scaffold is assembled while the mast 11a is extended upward, and the main tower top 5 is constructed by a total scaffold construction method.
[0019]
In the construction of the main tower coupling part 4 and the main tower top part 5, the climbing gantry 10 may be removed, and a bracket (not shown) may be installed on the upper outer surface of the column part instead to serve as the base of the tower crane 11. it can.
[0020]
It is also possible to construct the main tower coupling part 4 and the main tower top part 5 by using the climbing gantry 10, the formwork 20, and the scaffold 21 as they are.
[0021]
In addition, although the above has illustrated the case where it applies to the construction of the inverted Y-shaped main tower of the cable-stayed bridge, the present invention is not limited to this, and the present invention is also applied to the construction of other inverted Y-shaped tower structures. it can.
[0022]
【The invention's effect】
(1) According to the construction method of the present invention, when constructing an inverted Y-shaped tower structure, the construction of the intermediate part of the tower is to carry the climbing form method by placing the tower crane on the climbing gantry in the minimum state. The tower crane stay can be eliminated, and if the total scaffold construction method is used at the top of the tower, the length of the stay can be shortened in the construction of the top of the tower, reducing the equipment costs associated with the construction of the main tower Can be planned.
(2) A push-up type climbing device consisting of a push-up member such as a push-up beam and a push-up device such as a push-up jack is provided on the lower surface of the climbing gantry, and the formwork and scaffolding are provided on the upper part so as to be able to move laterally. Moreover, it can be performed quickly, and the construction time can be shortened and the construction cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a front view showing a starting state of a middle part of a main tower in a construction method of the present invention.
2 is a plan view of FIG. 1. FIG.
FIG. 3 is a side view of FIG. 1;
FIG. 4 is a front view showing from the start state to the end state of the middle part of the main tower of the construction method of the present invention.
FIG. 5 is a front view showing a construction state from the main tower coupling part to the main tower top part of the construction method of the present invention.
FIG. 6 is a front view showing a method of constructing an inverted Y-shaped main tower of a conventional cable-stayed bridge.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Reverse Y-shaped main tower 2 ... Main tower base part 3 ... Main tower center part 3a ... Column part 4 ... Main tower connection part 5 ... Main tower top part 10 ... Climbing gantry 11 ... Tower crane 12 ... Truss girder 13 ... Push-up type climbing device 13a ... Push-up beam 13b ... Push-up jack 20 ... Formwork 21 ... Scaffolding

Claims

It is a construction method of a tower-like structure in which two pillars are inclined and arranged so as to approach each other from the base, and the top part protrudes from the joint part of the two pillars. Install tower cranes at both ends of the climbing gantry spanned by the two pillars with the column formwork, with no mast added, and carry the material with the tower crane and raise the formwork with the climbing gantry The two pillar parts are constructed by repeating the above, and after the two pillar parts are combined, the top part is constructed by the total scaffold construction method while adding the mast to the tower crane, or by using the climbing gantry and the formwork. A construction method of a tower-like structure characterized by constructing the top.
In the construction method according to claim 1, a push-up type climbing device is provided on the lower surface of both ends of the climbing gantry to take up a reaction force on the existing tower body and push up the climbing gantry. A construction method of a tower-like structure, wherein the scaffold is provided so as to be laterally movable.