JP2002322642A - Installation of cage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an installation for a cage capable of efficiently and economically positioning the cage without using any large-scale crane even when the heavy cage is constructed in a deep trench in a narrow construction area under the ground with insufficient ground strength. SOLUTION: This installation method is carried out through five processes. In the first process, a wire jack A serving as a small hanging means is installed on an opening circumference edge of the trench T. In the second process, the cage 10a in the lowermost level is inserted into the trench T. In the third process, a hanging frame 30 arranged in the cage 10a is connected to a wire W held movably in the vertical direction by means of the wire jack A. In the fourth process, a cage 10b in the following level is connected to the cage 10a. In the fifth process, these connected cages are lowered to a predetermined depth inside the trench T by means of the wire jack A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of building a reinforced cage in which a reinforced cage is built in a trench when a reinforced concrete structure or the like is constructed.

[0002]

2. Description of the Related Art Efficiency, denseness, etc., for construction, such as realization of efficient structure arrangement by effective use of land or construction of an underground structure that does not interfere with existing structures, are improved. What is more demanding is the current situation at construction sites. Under such circumstances, the demand for complex and large-scale reinforced concrete structures planned in narrow construction areas in overcrowded urban areas, etc. is increasing in demand, such as structural strength, adaptability to large depths, and environmental conservation. In many cases, the underground diaphragm wall method, which is excellent in the field, is adopted.

Conventionally, in this construction method, due to the nature of construction, it is necessary to produce a reinforcing bar basket as a core material of a continuous wall in advance at an appropriate stage in a reinforcing bar manufacturing yard or the like on the ground.
It is manufactured up to about 0m (incomplete). The unfinished steel cage is transported to a temporary placing table or the like by a large crane and is waiting to be built in a trench.

[0004]

However, in the construction of a conventional reinforcing cage, in a construction yard where only a limited area is generally secured in many cases, various machines and reinforcing materials are used. In a complicated situation, a large crane will be required to run around the area while making reinforced cages, but on the other hand, the depth of the trenches where the reinforced cages will be built is deep, and the soil is also soft. In such a case, a large crane, which is a considerably heavy object, cannot even approach a trench, and the use of the large crane itself becomes difficult. In addition, the difficulty is further increased if the rebar basket weight is excessive.

[0005] In other words, in a narrow construction area, it is inherently very difficult for a large crane to cope with a situation where the trench depth is deep and the ground is soft, which significantly reduces the work efficiency. Increases in personnel costs and equipment costs required for response measures were unavoidable. On the other hand, even if a large crane could be used, the opportunity to use it was almost limited when building a reinforced cage, and it was difficult to obtain results worth the high rental fee.

Accordingly, the present invention has been made in view of such conventional problems, and without using a large crane, the construction area is narrow, the trench depth is deep, and the ground strength is not good. It is another object of the present invention to provide a method for installing a reinforcing bar cage that enables efficient and economical mounting of the reinforcing bar cage even in a construction situation where the weight of the reinforcing bar cage is large.

[0007]

In order to achieve the above-mentioned object, the invention described in claim 1 is a method for installing a reinforcing bar cage in which a plurality of reinforcing bar cages are sequentially built in a trench. A first step of installing a small suspending means on the periphery of the opening of the trench, a second step of inserting a lowermost reinforcing rod cage into the trench, and a vertically movable means by the small suspending means. A third step of connecting the held suspension wire to a suspension frame provided on the lowermost reinforced cage, a fourth step of connecting a next reinforced basket to the lowermost reinforced cage, A fifth step of lowering the connected rebar baskets to a predetermined depth in the trench by the small suspension means.

According to a second aspect of the present invention, in the method of constructing a reinforced cage according to the first aspect, the suspension frame is integrated with a reinforcing frame near an upper end portion of the lowermost reinforced cage. It is characterized by having.

According to a third aspect of the present invention, there is provided the method for building a reinforcing bar cage according to the first or second aspect, wherein the fourth step and the fifth step are performed until the reinforcing bar is built to a desired length. Is repeated.

[0010]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG.
(A) is a top view which shows the installation structure of the wire jack A used as a small suspension means in this embodiment,
(B) is a side view of the main part. Figure 2 shows wire jack A
It is a front view which shows the structure of. FIGS. 3 to 7 are explanatory views showing the steps of the method of building a reinforcing cage in the present embodiment, and FIGS. 8A and 8B are front views of the reinforcing cage 10a built at the lowermost level, respectively. It is a figure and a top view.

In the present embodiment, a case will be described in which, for example, a bridge pier foundation portion of a road is assumed, and the present invention is employed when the side wall portion of the structure is constructed. In order to carry out concrete casting work and the like in a narrow space, which is an underground excavation area, the reinforcing bar cage 10 as a reinforcing structure of the side wall is manufactured on the ground. At this time, the reinforcing bar cage 10 is replaced with an appropriate number of reinforcing bar cages 10a,
It is divided and manufactured in 10b or the like.

FIG. 8 shows the construction of the reinforcing rod cage.
As shown in (a) and (b), a suspension frame 30 for connecting the wire W held by the wire jack A is fixed in advance near the upper end of the reinforcing bar cage 10a to be built at the lowermost stage. deep. More specifically, of the reinforcing frames 32 provided at appropriate intervals in the vertical direction in order to hold the reinforcing bars of the reinforcing bar cage 10a, the reinforcing frames 32a near the uppermost portion are strengthened by increasing the thickness or the like. Keep it. And this reinforcement frame 3
For example, two suspension frames 30 are fixed so as to connect opposite sides of 2a, and the suspension frames 30 are integrated with the reinforcing frame 32a. However, the number of the suspension frames 30 may be appropriately determined according to the weight of the reinforcing bar cage 10a or the like. Further, the configuration for fixing the suspension frame 30 is not limited to the above-described configuration, and any configuration may be used as long as it is strong enough to support the weight of the reinforcing bar cage 10a and can be fixed to the reinforcing bar cage 10a without causing deformation of the reinforcing bar cage 10a. . Alternatively, the reinforcement frame 32a itself may be used as the suspension frame 30, and the wire W may be directly connected to the reinforcement frame 32a.

On the periphery of the opening of the trench T in which the reinforcing cage 10 is to be built, a wire jack A as a small suspension means is installed. The installation of the wire jack A is shown in FIG.
As shown in (b), the mounting is performed via a jack mounting piece 12 on a jack gantry 11 fixed to a gantry frame F laid over the periphery of the opening of the trench T, and the number of installations and the installation pattern are built. It is appropriately determined according to the weight and shape of the reinforcing bar cage 10, the building speed, and the like. In the present embodiment, four wire jacks A are arranged, two on each of two opposing sides of the gantry frame F, corresponding to the configuration of the suspension frame 30 described above. A wire having an appropriate shape and a sliding function so that a wire W such as a wire which the wire jack A grips so as to be vertically movable does not excessively come into contact with the gantry frame F, the gantry 11 or the like to be worn and torn. A guide 13 is attached to the inner peripheral edge of the frame F.

The wire jack A is, as shown in FIG.
It has a tower-like outer shape in which cylindrical bodies are connected, and a wire W is inserted through the center of the circle. The connected cylinders function as a single unit and exhibit a reliable vertical movement function of the wire W. They are Wire Jack A
In order from the upper part of the figure, there are a jack-side chuck 21, a jack-side claw opening jack 22, a center hole jack 23, a changeover-side chuck 24, and a changeover-side claw opening jack 25.
As an actual function, the center hole jack 23 is used as an intermediary, and the jack-side claw opening jacks 22 and the replacement side claw-opening jacks 25 located at both ends of the center hole jack 23 are inserted with the wire W in accordance with the direction in which the wire W is moved. Each slides and moves the wire W arbitrarily,
While continuing such a sliding motion, the jack-side chuck 2
1 and the transfer side chuck 24 exert a gripping function of tightening the wire W to suppress a shift or the like during the movement of the suspension wire, and to exhibit a reliable and stable jack function even in a situation where a heavy object is suspended. .

Hereinafter, the actual procedure from the installation of the wire jack A to the completion of the installation of the reinforcing rod cage will be described in detail with reference to FIGS.

First, as shown in FIG. 3, a wire jack A is placed on the periphery of the opening of the trench T into which the stabilizing solution L has been injected. Next, as shown in FIG.
0a is suspended by an appropriate means such as a crawler crane 40 or the like, and the suspension frame 3 fixed near the upper end portion of the reinforcing bar cage 10a.
It is inserted into the trench T until 0 reaches near the ground surface.

Next, as shown in FIG. 5, the wire W gripped by the wire jack A is connected to the suspension frame 30 fixed to the reinforcing cage 10a by using a suitable binding tool 34, and then the reinforcing cage 10a Is further suspended by the crawler crane 40 until its weight is completely supported by the wire W.

Next, as shown in FIG. 6, the reinforcing bar cage 10b of the second stage is suspended from above the trench T, and the lower end of the reinforcing bar cage 10b is inserted into the reinforcing bar cage 1 previously inserted into the trench T.
0a is connected to the upper end using a coupler such as a coupler joint 36. Then, as shown in FIG.
Wire jack A until the upper end reaches near the ground surface
Gradually jack down. Since then, all reinforced baskets 1
Until 0 is built, the process of connecting the next-stage rebar basket 10 and jacking down is repeated to secure the finally required total building length.

The rebar cage 10 having a predetermined total length of building through the above-described steps is completed by joining and fixing the upper end thereof to the upper end portion of the structure. After that, the solidification material such as concrete is poured into the trench T where the reinforced cage 10 has been completely built, and the target structure is constructed. Note that the wire W
The hanging frame 30 is preferably buried together with the rebar cage 10 as it is to carry out various operations, from the viewpoint of improving work efficiency.

As described above, in the present embodiment, the suspension frame 30 fixed to the lowermost reinforcing rod cage 10a is suspended in the trench by the wire jack A, which is a small suspending means. The rebar basket 10 is built by connecting the rebar baskets 10b of the step and hanging down by jack-down. For this reason, in a construction yard where only a limited narrow area can often be secured, the necessary work height, work radius, etc., should be set up using a wire jack A that is significantly smaller than a heavy machine such as a crane. Can be. Therefore, according to the present embodiment, it is possible to improve the working environment and the working efficiency without forming a situation in which the equipment used for the reinforced cage building work and other various machines and the reinforcing materials are complicated. It can be realized.

The main equipment required in each of the above steps is a wire jack A and a crawler crane 40.
Only, there is no need to use a large crane.
For this reason, the trench depth at which the reinforcing bar cage 10 is built is deep,
In addition, problems with conventional methods that require a large crane, such as the difficulty of using a large crane under construction conditions such as soil being soft and the weight of the reinforcing cage being excessive, Problems in construction costs such as high use costs can also be solved.

Further, since the suspension frame 30 is provided near the upper end of the reinforcing cage 10a, the stability of the reinforcing cage 10a is improved when the reinforcing rod cage 10a is suspended via the suspension frame 30 by the wire jack A. The workability is improved, and the suspension frame 30 can be easily fixed. Further, by fixing the hanging frame 30 to the reinforcing frame 32a and integrating it with the reinforcing frame 32a, it is possible to prevent the reinforcing cage 10a from being deformed when the reinforcing cage 10a is hung, and to prevent the reinforcing cage 10a from being deformed. It is not necessary to take measures to prevent deformation.

In addition, since the hanging frame 30 is fixed to the reinforcing bar cage 10a in advance, the hanging frame for hanging the reinforcing bar cage 10a is separated from the reinforcing bar cage 10a during the construction work. The operation for connecting the suspension frame and the reinforcing rod cage 10a is not required. For this reason, the time required for the erection work can be reduced.

Further, if the hanging frame is formed separately from the reinforcing bar cage 10a, it is necessary to place the reinforcing bar cage 10a on the hanging frame for the convenience of work. In this case, only the thickness of the hanging frame is required. The total height of the object to be built is increased, and therefore, it is necessary to make the trench T deeper. On the other hand, in the present embodiment, the suspension frame 30 is connected to the reinforcing frame 32a of the reinforcing bar cage 10a.
, It is not necessary to make the trench T deep, and the excavation time of the trench T is shortened.

[0025]

As described above, according to the present invention,
Without using a large crane, the construction area is narrow,
In a construction situation where the trench depth is deep, the ground strength is not good, and the weight of the reinforcing bar is large, the reinforcing bar can be built efficiently and economically. In addition, by providing a suspension frame for connecting the suspension wire to the reinforcement frame near the upper end of the reinforcing cage, it is possible to perform the erection work while hanging the reinforcing cage in a stable manner. The fixing of the frame is facilitated, and the deformation of the reinforcing bar cage during suspension can be prevented.

[Brief description of the drawings]

FIG. 1 (a) is a plan view showing an installation structure of a wire jack used as a small suspension means in a method of installing a reinforcing rod cage according to the present invention, and FIG. 1 (b) is a side view of the relevant part.

FIG. 2 is a front view showing a configuration of a wire jack.

FIG. 3 is an explanatory diagram showing a first step of a procedure for installing a reinforcing cage in the embodiment.

FIG. 4 is an explanatory view showing a second step of the procedure for installing a reinforcing rod cage in the present embodiment.

FIG. 5 is an explanatory diagram showing a third step in the procedure for installing a reinforcing cage in the present embodiment.

FIG. 6 is an explanatory view showing a fourth step of the procedure for installing a reinforcing cage in the present embodiment.

FIG. 7 is an explanatory view showing a fifth step in the procedure for installing a reinforcing bar cage in the embodiment.

FIGS. 8A and 8B are diagrams showing a configuration of a rebar basket built at the lowermost stage, wherein FIG. 8A is a front view and FIG. 8B is a plan view.

[Explanation of symbols]

 A wire jack (small suspension means) T trench W wire (suspension wire) 10 (10a, 10b) Reinforcing cage 30 suspension frame

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Masaki Ito 2-15-2 Konan, Minato-ku, Tokyo F-term (reference) 2D049 GB01 GC03 GD01 GD09 GE15

Claims (3)

[Claims] 1. A method of building a reinforcing cage in which a plurality of divided reinforcing cages are sequentially built in a trench, comprising: a first step of installing a small suspension means on an opening periphery of the trench; A second step of inserting the lowermost rebar basket into the trench, and connecting a suspension wire movably held up and down by the small suspension means to a suspension frame provided in the lowermost rebar basket. A third step of connecting the next-stage rebar basket to the lowermost rebar basket, and lowering the connected rebar basket to a predetermined depth in the trench by the small suspension means. 5. A method comprising the steps of: 2. The method according to claim 1, wherein the hanging frame is integrated with a reinforcing frame near an uppermost portion of the lowermost cage. 3. The method according to claim 1, wherein the fourth step and the fifth step are repeated until the reinforcing bar is built to a desired length.