JP3224152B2 - Construction method of cross beam in concrete building - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a cross beam in a concrete structure, and more particularly to a method of extremely high working efficiency and high safety.

[0002]

2. Description of the Related Art Conventionally, a concrete main tower is sometimes used for a bridge such as a road, a railway, and a water supply to support a bridge floor.

[0003] In such a concrete main tower, an inner frame and an outer frame are formed using a concrete form made of a wooden or steel plate, and concrete is poured between the inner frame and the outer frame. It is constructed by setting. Usually, a plurality of these are erected and connected to each other by a cross beam to form an integrated structure.

In the construction of such cross beams, a concrete formwork is supported by a large number of supports from below, and work scaffolds are installed in a wide range.

[0005]

However, in the above-mentioned conventional method, the work of providing a support and a scaffold on the large and tall main tower and removing the same requires a lot of time and labor. .

When building a long concrete main tower, it is necessary to make the inner frame and the outer frame as long as possible to save labor. Therefore, unstable work at high places increases, and the work of installing the formwork for the cross beams at high places is dangerously inefficient.

In addition to the above problems, a concrete main tower usually requires a step of providing a cross beam between two main towers. Therefore, this step must be performed simultaneously with the construction of the conventional concrete main tower. However, it has been pointed out that the construction is extremely complicated.

[0008] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a method for efficiently and safely constructing a cross beam in a concrete building.

[0009]

Means for Solving the Problems In order to achieve the above object, the following method is used in a method of passing a cross beam between a plurality of concrete structures.

[0010] That is, advance drilled a hole 60 in the side wall of the building, the provisional set structure from the lower edge of the hole portion 60, 60 of the severally 6
1, 61 a extends in the horizontal direction while supporting the upper rope 62 combines the tips of these temporary structures 6 1, 61, high tension steel wire communicating with the respective holes 60, 60 63
Is stretched in the temporary structure 61, and the high tension steel wire 63 is slightly bent downward only at the center of the temporary structure 61, and concrete is poured into the temporary structure 61.
To remove the rope 62 causes tensioning of the high tension steel wire 63 after curing of the concrete.

[0011]

According to the method for constructing a cross beam in a concrete building of the present invention, the construction can be performed after the completion of the concrete building or alternately with the progress of the construction of the building. it can. In addition, the construction work of the formwork at a high place can be minimized, which is safe. Further, the strength after the construction can be maintained for a long period of time due to the tension of the high tension steel wire 63.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. First, for convenience of explanation, a concrete main tower installed by the method for installing a concrete main tower according to the present invention will be described with reference to FIGS. 1, 2 and 19 to 22.

In FIG. 1, a concrete main tower comprises a main tower section 20 and a beam section 2 connecting the left and right main tower sections 20, 20.
And 1. The main tower section 20 is a quadrangular frame having a hollow inside.

The beam portion 21 is a concrete member extending in the horizontal direction, and connects the pair of main tower portions 20 with each other. This beam portion 21 is located between the main tower portions 20, 20.
It is provided in four places in parallel.

In the present invention, concrete is hardened while pouring concrete into the moving mold 3, and the moving mold 3 in the hardened portion is moved upward while the continuous prism (main tower 2) is moved.
0). First, the moving formwork 3 that determines the shape of the main tower section 20 will be described.

The moving mold 3 includes an inner frame 1 and an outer frame 2 surrounding the inner frame. The inner frame 1 and the outer frame 2 have squares similar in cross section to each other.
Concrete 8 is cast between the inner frame 1 and the outer frame 2. Then, the inside of the inner frame 1 is hollow. The inner frame 1 and the outer frame 2 are connected at the upper edges of each other and are integrated. However, a sufficient space is set between the inner frame 1 and the outer frame 2 so as not to hinder various operations.

A driving device 51 is provided on the moving mold 3.
The driving device 51 can be engaged with a climbing rod 50 described later to move the entire moving mold 3 upward.

A climbing device 4 is installed inside the inner frame 1 in the moving mold 3. The climbing device 4 is a device for moving the posts 5 inserted into the cavity 42 upward using the locking holes 41 provided in the cavity 42 formed in the inner frame 1 as a foothold.

The post 5 has a structure in which a steel frame is assembled on a truss, and a fixed arm 43 is fixed to a lower end of the post. On the other hand, a moving arm 44 is slidably held by the post 5 above the fixed arm 43.

The fixed and movable arms 43 and 44 are connected by a jack 45 so that they can approach and separate from each other. Then, these fixed and movable arms 43, 4
4 is provided with a stopper 46 which can come and go in the side direction. The stopper 46 is provided at a position where it can be engaged and disengaged from the locking hole 41.

The climbing device 4 having the above structure is provided at the lower end position of the post 5, and the girder portion 6 is supported above the post 5. The girder portion 6 is a structure for supporting the hoist H, and a portion that rises integrally including the post 5 and the climbing device 4 constitutes a climbing girder 7.

Therefore, the climbing girder 7 is positioned so as to bridge between the main tower portions 20. The moving formwork 3 is installed so as to surround the post 5. First, in the initial stage, a base portion is formed on the ground portion by a jump-up method, and then the concrete 8 is formed.
Is placed between the inner frame 1 and the outer frame 2. A climbing rod 50 is previously provided between the inner frame 1 and the outer frame 2.
Is erected. Although the climbing rod 50 is sealed in the main tower portion 20 like a reinforcing bar, it works like a kind of rail during the construction. That is, the driving device 51 is engaged so as to approach the climbing rod 50, and serves as a foothold for moving the moving mold 3 upward.

The construction procedure of the above configuration will be described . Also not a, the main column portion 20, FIG. 1, concrete as shown in FIG. 2 - pouring between the door 8 inner frame 1 and the outer frame member 2. At this time, a metal cup (not shown) is embedded in the inner wall of the cavity 42 formed in the inner frame 1 as the locking hole 41. The metal cup is fixed to a part of a reinforcing bar provided between the inner frame 1 and the outer frame 2, and the edge of the metal cup is flush with the inner wall.

After a lapse of a predetermined time, it is confirmed that the lower layer concrete 8 has hardened, and the driving form 51 is moved upward by the driving device 51, and the climbing device 4 is operated to raise the post 5.

The climbing device 4 constitutes an architectural moving device. This operation will be described with reference to FIGS. 3 to 10. First, as shown in FIG. Stopper 4 provided
Numerals 6 are locked in locking holes 41 respectively. In FIG. 4, the stopper 46 on the fixed arm 43 side is retracted to contract the jack 45. Then, the fixed arm 43 is raised, and the post 5 integrated with the fixed arm 43 is raised. Then, retracting the jack 45 (FIG. 5) when the stopper 46 reaches the next locking hole 41 (FIG. 6) projecting fixing arm 43 side of the stopper 46 engaging
The hole 41 is engaged.

Next, in FIG. 7, the stopper 46 on the moving arm 44 side is retracted to extend the jack 45 (FIG. 8). Then, the moving arm 44 rises, and the stopper 46
When is that led to the next locking hole 41 (FIG. 10) moves the arm 4
Projecting the 4 side of the stopper 46 engaged with the engaging hole 41. This one cycle is completed, post 5 locking hole 4 1
Rise by the pitch of. Further, this rising distance is synchronized with the movement of the moving mold 3, and the moving speed thereof is determined in relation to the hardening speed of the concrete 8. That is, the above-described movement is performed when the concrete 8 is completely hardened.

In this manner, the concrete pillars extend sequentially upward to form the main tower portion 20. Next, a method of constructing the beam portion 21 connecting the left and right main tower portions 20 will be described.

This method is a method of passing a cross beam between a plurality of concrete structures, and will be described with reference to FIGS. That is, the hole portions 60 are formed in advance in the side walls of the main tower portions 20, 20 which are concrete buildings, facing each other ( FIG. 11 ).

Then, the temporary structures 61, 61 are extended from the lower edges of the holes 60, 60 in the horizontal direction while being supported from above by the ropes 62. The temporary structures 61, 61 are made of a truss made of steel, and the rope 62 is a structural spiral rope. Then, a PC foam is stretched on the bottom surfaces of the temporary structures 61.

The ropes 62 are stretched while the temporary structures 61, 61 are held at appropriate positions by a hoist (FIGS. 12 and 13). And these temporary structures 61,
The high-strength steel wires 63 communicating with the holes 60 are connected to the temporary structure 61 by connecting the tips of the 61 to each other. The high tension steel wire 63 is used for post tension, and is arranged so as to be slightly curved downward only at the center of the temporary structure 61 (FIG. 14).

Next, concrete is poured into the temporary structure 61 (FIG. 15).
The high tension steel wire 63 is tensioned. Here, since the high-tensile steel wire 63 is shaped so as to be slightly curved downward only at the central portion of the temporary structure 61, a moment is generated to lift the intermediate portion of the temporary structure 61. Here, after removing the rope 62 (FIG. 16), a temporary structure 64 of the second stage is temporarily mounted on the upper surface of the temporary structure 61, and a PC form (buried formwork made of concrete) is similarly formed. ) And then concrete is cast. Furthermore, the second-stage temporary structure 64
A temporary structure 65 of the third tier is temporarily provided on the upper surface of FIG.
Similarly, a PC foam is stretched (FIG. 17). Similarly, a PC foam is stretched and concrete is cast (FIG. 1).
8).

[0032] According to the construction method of the cross beam, conventional
Not only is there no need for a formwork that requires demolding,
High tension steel wire 63 acts against the weight of concrete,
It is possible to prevent cracks or the like from occurring in concrete due to aging.

FIG. 19 to FIG. 22 show the results obtained by coordinating the above-described methods. That is, the construction of the main tower 20 and the beam 21 is performed in parallel, and the process of completing the four-stage beam 21 simultaneously with the completion of the main tower 20 is shown.

As described above, according to the present invention, it is essentially possible to perform construction without scaffolding and unsupported construction, and to achieve a safe and shortened construction period. Moreover, the main tower 20 and the beam 21
Therefore, it is possible to perform the most suitable treatment for each construction without interference in the process, and high quality construction can be performed.

In addition, all of the equipment used in the present construction method can be assembled and disassembled with a small hoist, and a tower crane which requires enormous costs for installation and removal is unnecessary. Also,
Since the components can be unitized and pre-producted, it is advantageous in terms of the construction period and cost as compared with the conventional construction method. Also,
If the work stand is supported by posts and girders,
Movement and re-arrangement are facilitated, and work efficiency can be improved. In addition, there is no need for a tower crane that requires huge costs for installation and removal.

In the above-described embodiment, the method of forming the cross beam in constructing the concrete main tower has been described. However, the present invention is not limited to this example. Of course you can.

[0037]

According to the present invention configured as described above,
In constructing the cross beam, the construction procedure can be optimized after the concrete building is completed or alternately with the progress of the construction of the building.

Further, the construction work at high places can be minimized, so that it is safe. In addition, the strength after construction can be maintained over a long period of time due to the tension of the high tension steel wire.

[Brief description of the drawings]

FIG. 1 is a side view of a construction process of a concrete main tower showing an embodiment of the present invention.

FIG. 2 is a side view of a construction process of a concrete main tower showing one embodiment of the present invention.

FIG. 3 is a front view showing a post elevating process according to the embodiment of the present invention.

FIG. 4 is a front view showing a post elevating process according to the embodiment of the present invention.

FIG. 5 is a front view showing a post ascending process showing one embodiment of the present invention.

FIG. 6 is a front view showing a post elevating process according to the embodiment of the present invention.

FIG. 7 is a front view showing a post raising process according to the embodiment of the present invention.

FIG. 8 is a front view showing a post ascending process showing one embodiment of the present invention.

FIG. 9 is a front view showing a post raising process according to the embodiment of the present invention.

FIG. 10 is a front view showing a post ascending process showing one embodiment of the present invention.

FIG. 11 is a front view showing a process of a cross beam construction method showing one embodiment of the present invention.

FIG. 12 is a front view showing a process of a cross beam construction method showing one embodiment of the present invention.

FIG. 13 is a front view showing a process of a cross beam construction method showing one embodiment of the present invention.

FIG. 14 is a front view showing a process of a cross beam construction method showing one embodiment of the present invention.

FIG. 15 is a front view showing a process of a cross beam construction method showing one embodiment of the present invention.

FIG. 16 is a front view showing a process of a cross beam construction method showing one embodiment of the present invention.

FIG. 17 is a front view showing a process of a cross beam construction method showing one embodiment of the present invention.

FIG. 18 is a front view showing a process of a cross beam construction method showing one embodiment of the present invention.

FIG. 19 is a front view of a working example of a concrete main tower showing one embodiment of the present invention.

FIG. 20 is a front view of a construction example of a concrete main tower showing one embodiment of the present invention.

FIG. 21 is a front view of a working example of a concrete main tower showing one embodiment of the present invention.

FIG. 22 is a front view of a working example of a concrete main tower showing one embodiment of the present invention.

[Explanation of symbols]

 60 hole 61 temporary structure 62 rope 63 high tension steel wire

Continuing on the front page (72) Inventor Tadashi Nishita 2-10-10 Fujimi, Chiyoda-ku, Tokyo Inside Tadashi Construction Industry Co., Ltd. Inside Construction Industry Co., Ltd. (72) Inventor Masahiro Shiraishi 2--10-26 Fujimi, Chiyoda-ku, Tokyo In front of Construction Industry Co., Ltd. Maeda Construction Industry Co., Ltd. (58) Field surveyed (Int. Cl. ⁷ , DB name) E01D 21/00

Claims (1)

(57) [Claims] 1. A method for performing cross beam among a plurality of concrete buildings, in the side wall of the building leave drilled hole, the provisional set structure from the lower edge of the hole portion of the severally The ropes are extended in the horizontal direction while being supported from above by ropes, and the ends of these temporary structures are connected to each other, and a high-tensile steel wire communicating with each of the holes is stretched into the temporary structures and tension steel wire is Shomoto curved downward only at the central portion of the temporary structure, and Da設concrete into the temporary structure in a removal child the ropes with tensioning after curing the high tension steel wire concrete A method of constructing a cross beam in a concrete building, characterized by the following.