JPH0681316A - Construction method for cross beam of concrete building - Google Patents

Abstract

PURPOSE:To efficiently and safely construct a cross beam in a concrete building. CONSTITUTION:Hole sections 60 are bored on side walls of a building, temporary structures 61, 61 are extended in the horizontal direction from the lower edges of the hole sections 60, 60 respectively while being supported from above with ropes 62, tips of the temporary structures 61, 61 are connected together, and a high-tension steel wire 63 communicated with the hole sections 60, 60 is stretched in the temporary structures 61. The high-tension steel wire 63 is slightly curved downward only at the center section of the temporary structures 61, concrete is placed in the temporary structures 61, and the high-tension steel wire 63 is tightened after the concrete is hardened. Necessary reinforcing work is applied to the upper side of the temporary structures 61 after the ropes 62 are removed.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, a concrete main tower may be used to support a bridge floor of a bridge such as a road, a railroad, and a water supply.

In such a concrete main tower, an inner frame body and an outer frame body are formed by using a concrete formwork of a wooden or steel plate material, and concrete is poured between the inner frame body and the outer frame body. It is constructed by installing. And, these are usually erected in a plurality and are connected to each other by lateral beams to form an integral structure.

In the construction of such a horizontal beam, a concrete formwork was supported by a large number of support works from below, and work scaffolds were installed over a wide area.

[0005]

However, in the above-mentioned conventional method, it takes a lot of time and labor to install a support and a scaffold on the large and tall main tower and to remove it. .

Further, when constructing a long concrete main tower, it is necessary to make the inner frame and the outer frame as long as possible in order to save labor. Therefore, the unstable work at high places increases, and the work of installing the formwork for the horizontal beam at high places is dangerous and inefficient.

In addition to the above problems, a concrete main tower usually requires a step of passing a horizontal beam between two main equalizers. Therefore, this step must be performed at the same time as the construction of the conventional concrete main tower. However, it is pointed out that the construction process will be extremely complicated.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a method capable of efficiently and safely constructing a horizontal beam in a concrete structure.

[0009]

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

That is, the hole 60 is formed in the side wall of each building, and the temporary structure 6 is formed from the lower edges of the holes 60, 60.
1 and 61 are horizontally supported while being supported from above by a rope 62, the tips of these temporary structures 61 and 61 are joined together, and the high-tensile steel wire 63 is connected to the holes 60 and 60.
While being stretched in the temporary structure 61, the high-tensile steel wire 63 is slightly bent downward only in the central portion of the temporary structure 61, and concrete is placed in the temporary structure 61.
After the concrete is hardened, the high-tensile steel wire 63 is tensioned and the rope 62 is removed, and then the upper surface side of the temporary structure 61 is reinforced.

[0011]

In the method for constructing a horizontal beam in a concrete structure according to the present invention, the construction can be optimized after the concrete construction is completed or alternately with the progress of construction of the construction. it can. In addition, it is safe because the work of constructing the formwork at high places is minimal. Further, the tension of the high-tensile steel wire 63 allows the strength after construction to be maintained for a long period of time.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. First, for convenience of description, 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 the figure, the concrete main tower includes a main tower section 20 and a beam section 2 connecting the left and right main tower sections 20, 20.
1 and 1. The main tower portion 20 is a rectangular frame having a hollow cross section.

The beam portion 21 is a member made of concrete that extends in the horizontal direction, and connects the pair of main tower portions 20, 20. The beam portion 21 is provided between the main tower portions 20 and 20,
It is provided in four places in parallel.

In the present invention, concrete is poured into the moving mold 3 to be hardened, and the moving mold 3 at the portion where the hardening is completed is moved upward and continuous prisms (main tower 2).
0). First, the moving mold 3 that determines the shape of the main tower 20 will be described.

The moving frame 3 comprises an inner frame 1 and an outer frame 2 surrounding the inner frame 1. The inner frame body 1 and the outer frame body 2 have squares whose cross sections are similar to each other,
The concrete 8 is placed between the inner frame 1 and the outer frame 2. Then, the inner side of the inner frame body 1 becomes a cavity. The inner frame body 1 and the outer frame body 2 are connected to each other at their upper edges and are integrated. However, a sufficient space is set between the inner frame 1 and the outer frame 2 so as not to interfere with various operations.

A drive unit 51 is attached to the moving mold 3.
Is provided, and 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 of the moving mold 3. The climbing device 4 is a device for moving the posts 5 inserted in the cavities 42 upward by using the locking holes 41 provided in the cavities 42 formed in the inner frame 1 as a foothold.

The post 5 has a structure in which a steel frame is assembled in a truss, and a fixed arm 43 is fixed to the lower end of this 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 be moved toward and away from each other. Then, these fixed and movable arms 43, 4
Each of the stoppers 4 is provided with a stopper 46 that can be retracted in the side direction. The stopper 46 is provided at a position where it can be engaged with 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 the climbing girder 7 is constituted by a portion that integrally rises including the post 5 and the climbing device 4.

Therefore, the climbing girder 7 is located so as to bridge between the main tower portions 20, 20. The moving form 3 is installed so as to surround the post 5. First, in the initial stage, a base part is formed by a jump-up method in the above-ground portion, and then a 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 this climbing rod 50 is enclosed in the main tower portion 20 like a reinforcing bar, it functions as a kind of rail during construction. That is, the driving device 51 is engaged with the climbing rod 50 so as to draw it closer, and serves as a foothold for moving the moving mold 3 upward.

First, in the main tower portion 20, concrete 8 is poured between the inner frame body 1 and the outer frame body 2 as shown in FIGS. 1 and 2.
At this time, a metal cup (not shown) is embedded as the locking hole 41 in the inner wall of the cavity 42 formed in the inner frame 1. This metal cap is fixed to a part of a reinforcing bar provided between the inner frame body 1 and the outer frame body 2, and the rim of the metal cap is flush with the inner wall.

After the elapse of a predetermined time, it is confirmed that the lower concrete 8 has hardened, and the driving device 51 moves the moving mold 3 upward, and the climbing device 4 is operated to raise the post 5.

The climbing device 4 constitutes a construction moving device, and its operation will be described with reference to FIGS. 3 to 10. First, as shown in FIG. 3, the stationary and moving arms 43 and 44 are initially operated as shown in FIG. Stopper 4 provided
6 are locked in the locking holes 41, respectively. Then, in FIG. 4, the stopper 46 on the fixed arm 43 side is retracted to contract the jack 45. Then, the fixed arm 43 rises, and the post 5 integrated with the fixed arm 43 rises. Then, the jack 45 is further contracted (FIG. 5), and when the stopper 46 reaches the next locking port 41 (FIG. 6), the stopper 46 on the fixed arm 43 side is projected and engaged with the locking port 41.

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 it reaches the next locking port 41 (FIG. 10)
The stopper 46 on the fourth side is projected and engaged with the locking port 41. This completes one cycle, and the post 5 rises by the pitch of the locking port 1. Further, this rising distance is synchronized with the movement of the moving form 3, and the moving speeds thereof are determined in relation to the hardening speed of the concrete 8. That is, the above-mentioned movement is performed when the concrete 8 is completely hardened.

In this way, the concrete columns are sequentially extended upward to form the main tower section 20. Next, a method of constructing the beam portion 21 connecting the left and right main tower portions 20, 20 will be described.

This construction method is a construction method in which a horizontal beam is passed between a plurality of concrete structures, which will be described with reference to FIGS. 11 to 18. That is, the holes 60 are provided in advance in the side walls of the main towers 20 and 20 which are concrete structures facing each other (FIG. 1).

Then, the temporary structures 61, 61 are horizontally extended from the lower edges of the respective holes 60, while the ropes 62 support the temporary structures 61, 61 from above. The temporary structures 61, 61 are steel members assembled in a truss, and the rope 62 is a structural spiral rope. Then, PC foam is stretched on the bottom surfaces of the temporary structures 61, 61.

The ropes 62 are stretched while the temporary structures 61, 61 are held in proper positions by hoists (FIGS. 12 and 13). Then, these temporary structures 61,
The high-strength steel wire 63, which is connected to the distal ends of 61 and communicates with the holes 60, 60, is stretched in the temporary structure 61. The high-tensile steel wire 63 is for post-tensioning and is arranged so as to bend downward only at the central portion of the temporary structure 61 (FIG. 14).

Next, concrete is poured into the temporary structure 61 (FIG. 15), and after the strength of the concrete is developed,
The high-tensile steel wire 63 is tensioned. Here, since the high-tensile steel wire 63 has a shape that slightly bends downward only in the central portion of the temporary structure 61, a moment that raises the intermediate portion of the temporary structure 61 is generated. Here, after the rope 62 is removed (FIG. 16), the second-stage temporary structure 64 is erected on the upper surface of the temporary structure 61, PC foam is stretched in the same manner, and then concrete placing is performed. further,
On the upper surface of the second-stage temporary structure 64, the third-stage temporary structure 6 is provided.
5 is erected (FIG. 17), PC foam is stretched in the same manner, and then concrete is poured (FIG. 18).

According to such a method of constructing a horizontal beam, not only is a formwork unnecessary, but the high-tensile steel wire 63 acts against the weight of concrete, causing cracks or the like in the concrete as it ages. Can be prevented.

FIGS. 19 to 22 show the above-mentioned construction methods performed in cooperation with each other. That is, the construction of the main tower portion 20 and the beam portion 21 is performed in parallel, and the process of completing the main tower portion 20 and the four-stage beam portion 21 at the same time is shown.

As described above, according to the present invention, it is essentially possible to carry out the construction without scaffolding and without supporting work, and it is possible to achieve safety and shorten the construction period. Moreover, the main tower section 20 and the beam section 21
Since there is no interference in the process with and the optimum treatment can be performed for each construction, high-quality construction can be performed.

Further, all the equipment used in the present construction method can be assembled and disassembled by a small hoist, and a tower crane which requires a huge cost for installation and removal is also unnecessary. Also,
It is advantageous in terms of construction period and cost as compared with the conventional construction method because it is possible to unitize members and make them into pre-products. Also,
If you support the work platform with the post and girder part,
The movement and rearrangement are easy, and work efficiency can be improved. In addition, the tower crane, which requires a huge cost to install and remove, is no longer required.

In the above-mentioned embodiment, the method of forming a horizontal beam in constructing a concrete main tower has been described, but the present invention is not limited to this example, and can be applied to any structure for horizontal beam construction. Of course, you can

[0037]

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

Further, it is safe because the construction work at a high place can be minimized. Furthermore, the tension of the high-tensile steel wire allows the strength after construction to be maintained for a long period of time.

[Brief description of drawings]

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

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

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

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

FIG. 5 is a front view showing a rising process of the post according to the embodiment of the present invention.

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

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

FIG. 8 is a front view showing a rising process of the post according to the embodiment of the present invention.

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

FIG. 10 is a front view showing a rising process of the post according to the embodiment of the present invention.

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

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

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

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

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

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

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

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

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

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

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

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

[Explanation of symbols]

 60 ・ ・ Hole 61 ・ ・ Temporary structure 62 ・ ・ Rope 63 ・ ・ High-tensile steel wire

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shin Nishida 2-10-10 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industry Co., Ltd. (72) Inaka Sakae 2-1026 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industry Co., Ltd. (72) Inventor Masayuki Shiraishi 2-10-10 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industry Co., Ltd. (72) Ken Ken Takaragami 2-10-26 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industry Co., Ltd.

Claims (1)

[Claims] 1. A method of passing a horizontal beam between a plurality of concrete structures, wherein holes are bored in the side wall of each structure, and a temporary structure is roped from the lower edge of each hole. Extend horizontally while supporting from above, and join the tips of these temporary structures together,
A high-tensile steel wire communicating with each of the holes is stretched in a temporary structure, and the high-tensile steel wire is slightly bent downward only in the central portion of the temporary structure, and concrete is inserted in the temporary structure. A method for constructing a horizontal beam in a concrete structure, which comprises placing, after hardening the concrete, tensioning the high-tensile steel wire and removing the rope, and then reinforcing work on the upper surface side of the temporary structure.