JP2003313860A - Method and device for assembling pit reinforcement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pit reinforcement assembly method capable of reducing a period and a cost for assembling pit reinforcements and assuring an assembly accuracy. <P>SOLUTION: This pit reinforcement assembly method comprises the steps of forming a scaffold 12 for reinforcement assembly in an excavated pit 10, temporarily and annularly assembling hoop reinforcements 20 for multiple stages by using an assembly device 18 on a ground 16 around the pit 10, carrying the temporarily assembled multiple stages of hoop reinforcements 20, in order, into the pit 10 and connecting the multiple stages of hoop reinforcements 20 to the inside of the pit 10 by using the scaffold 12, inserting the main reinforcements 56a and 56b into the pit 10 and connecting the main reinforcements 56a and 56b to the hoop reinforcements 20 by using the scaffold 12, and dismantling and carrying out the scaffold 12. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft rebar assembling method and device, and more particularly to a shaft rebar assembling method and device for cast-in-place concrete such as piles and linings.

[0002]

BACKGROUND ART AND PROBLEMS TO BE SOLVED BY THE INVENTION In general,
When constructing piles and linings, in-situ concrete is poured into the excavated vertical shaft by assembling reinforcing bars.

[0003] For example, in a deep foundation pile, when the main bar is laid out double in the inside and outside, it is constructed in the following steps.

First, a setup streak is attached to a liner plate in a vertical shaft while building a scaffold in the vertical shaft.

Next, the outer hoop muscles divided into two or three parts are suspended by a wrecker into the shaft, and the outer hoop muscles are connected to each other by joints while the scaffolding is assembled from the lowest stage to the upper stage, and attached to the setup muscles.

Then, the outer main muscles are hung by a wrecker,
A scaffold is used to connect the external main muscles and the external hoop muscles.

Next, the scaffold is disassembled.

In this state, the inner hoop muscles divided into two or three parts are suspended by a wrecker into the shaft, and the inner hoop muscles are connected to each other by joints while attaching scaffolds from the lowest stage to the upper stage and attached to the setup muscles.

Then, the inner main muscles are hung by a wrecker,
A scaffold is used to connect the inner main muscle and the inner hoop muscle.

Then, the scaffold is dismantled and concrete is poured into the shaft.

However, when performing such construction,
As the two or three split inner and outer hoop muscles are assembled one step at a time in the shaft, the work of lifting by a wrecker increases, and when the scaffold is assembled, the inner and outer hoop muscles are Since the scaffolds interfere with each other, the number of times of assembling and disassembling the scaffolding increases, the construction period becomes longer, and the construction cost becomes higher.

Further, if the inner and outer hoop muscles become thicker, the work efficiency in the shaft further decreases, and the bar arrangement accuracy also decreases.

An object of the present invention is to provide a vertical shaft reinforcing bar assembling method and an assembling apparatus capable of shortening the period for assembling the reinforcing bars in the vertical shaft, reducing the cost, and ensuring the assembly accuracy.

[0014]

In order to achieve the above object, a shaft rebar assembling method according to the present invention comprises a step of forming a scaffold for rebar assembly in an excavated shaft, and an assembling apparatus on the ground around the shaft. A step of temporarily assembling the hoop muscles into a ring by dividing the hoop muscles into a plurality of stages, and sequentially loading the temporarily assembled hoop muscles of the plurality of stages into the shaft, and using the scaffolding to form the hoop muscles of each stage into the shaft. And a step of connecting the main muscle and the hoop muscle using the scaffold by inserting a main muscle into the shaft, and a step of disassembling and carrying out the scaffold. And

According to the present invention, by using an assembling device on the ground around the shaft, the hoop muscles are divided into a plurality of stages and temporarily assembled into an annular shape, so that a plurality of stages of hoop muscles are collectively hung in the shaft. It can be attached by attaching, and the number of times of lifting work by the wrecker can be reduced, and since the hoop muscle is hung down in the assembled state, there is no interference with the scaffolding and the number of times of assembling and disassembling the scaffolding is reduced. It is possible to shorten the construction period and the cost.

Also, to assemble the hoop muscle on the ground,
Even if the hoop muscle becomes thick, the work efficiency is good and the bar arrangement accuracy can be good.

In the present invention, the scaffold is formed with a space left between the scaffold and the shaft inner wall in which the temporarily assembled hoop muscle can be installed.

With this structure, the temporarily assembled hoop muscles can be reliably hung and installed in the shaft.

Further, in the present invention, the assembling apparatus has a hoop muscle supporting member which is detachably provided at least at three positions with respect to the base member, and a plurality of the hoop muscles are provided to the hoop muscle supporting member. A step of temporarily lifting the hoop muscle supporting members, lifting the temporarily assembled hoop muscles into the shaft, and carrying out only the hoop muscle supporting members after the loading can be provided.

With such a configuration, if the hoop muscles are suspended with the hoop muscle supporting members being supported, and the hoop muscles are attached and then only the hoop muscle supporting members are taken out, the provisional movement of the hoop muscles is performed. It is possible to assemble, carry in and attach easily and surely.

The assembling apparatus of the present invention has a base member having stand members at at least three positions corresponding to the diameter of the hoop muscle, and at least detachably erected on the base member via the stand member. Three hoop muscle supporting members, and a plurality of temporary assembling means for temporarily assembling a plurality of stages of hoop muscles on the hoop muscle supporting member in an annular shape at a predetermined pitch,
It is characterized by having.

According to the present invention, the hoop muscles can be easily temporarily assembled to the hoop muscle supporting member erected on the stand member by using the temporary assembling means, and a plurality of hoop muscles are temporarily assembled to the hoop muscle supporting member. In this state, by removing the hoop muscle support member from the stand member, the hoop muscle can be transported together with the hoop muscle support member, and the hoop muscle can be easily transported. If the supporting state is released, the hoop muscle supporting member can be easily taken out.

Further, since there are at least three hoop muscle supporting members, it is possible to stably support the annular hoop muscle.

In the present invention, the hoop muscle supporting member may be provided with a lifting jig capable of vertically lifting.

With such a structure, it is possible to reliably convey the hoop streak while maintaining the horizontal state by the hanging jig.

Further, in the present invention, the temporary assembling means includes a plurality of temporary assembling holes formed at a predetermined pitch in the hoop muscle supporting member, and a temporary assembling member that is inserted into the temporary assembling holes to support the hoop muscle. And a combination pin.

With this structure, it is possible to support and release the hoop muscle with a simple structure.

The temporary assembling means may include a plurality of temporary assembling pins which are provided on the hoop muscle supporting member so as to be foldable at a predetermined pitch and which support the hoop muscle.

With this structure, the hoop muscles are temporarily assembled with the temporary assembly pins protruding, the hoop muscles are attached in the shaft, and then the temporary assembly pins can be folded to easily pull the hoop muscles from the hoop muscles. The muscle support member can be removed.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings.

1 to 4 are views showing a shaft rebar assembling method according to an embodiment of the present invention.

FIG. 1 is a diagram showing the overall construction of a shaft rebar assembling method according to this embodiment.

This vertical shaft rebar assembling method is adapted to be used for constructing deep foundation piles. First, as shown in FIG. 1A, after excavating the vertical shaft 10, the scaffolding 12 within the vertical shaft 10 is used.
While assembling, install the setup bar 14 to the liner plate.

In this case, the outer periphery of the scaffold 12 is projected toward the liner plate side and brought close to the scaffold 12, and the setup streak 14 is attached in this state.

Next, as shown in FIG.
Using the assembling device 18 on the ground 16 around the hoop muscle 20
Are tentatively assembled by dividing into multiple stages.

Specifically, the assembling apparatus 18 is shown in FIGS.
As also shown, it has a base member 22, a hoop muscle support member 24, and a temporary assembly means 26.

The base member 22 is a base plate 28.
And a base mold member 30.

The base plate 28 is made of a hexagonal iron plate and is installed horizontally on the ground 16.

The base mold member 30 is formed of six H-shaped steels fixed by bolts or the like on the base plate 28 in a state of radially projecting from the center side of the base plate 28 through the hexagonal corners. .

A stand member 32 is provided on the protruding tip of each base mold member 30.

As shown in FIG. 4, the stand member 32 is slidably engaged with the flange portion 34 of each base mold member 30 in the radial direction, and has a mounting portion 38 which can be fixed by a bolt 36 at a predetermined position. The insertion part 4 formed of a rectangular pipe provided so as to project upward from the upper surface of the mounting part 38.
It has 0 and.

The hoop muscle supporting member 24 has a length capable of supporting a plurality of stages, for example, 6 stages of hoop muscles 20 at a predetermined bar arrangement pitch, and is inserted into the stand member 32 of each base mold member 30 to stand upright. It consists of 6 square steel pipes that can be installed.

The temporary assembling means 26 has a plurality of, for example, six temporary assembling holes 42 formed through the hoop muscle supporting member 24 in accordance with a predetermined bar arrangement pitch, and the hoops inserted through the temporary assembling holes 42. And a temporary assembly pin 44 that supports the muscle 20.

At the time of temporary assembly, first, the base plate 28 is horizontally installed on the ground 16, the base mold members 30 are radially installed on the base plate 28 and fixed by bolts, and the stand member 32 is set to the diameter of the hoop muscle 20. And fix it with bolts 36.

Next, the insertion portion 40 of the stand member 32
After the hoop muscle support member 24 is inserted into and erected, the temporary assembly pin 44 is inserted into the temporary assembly hole 42 of the hoop muscle support member 24.

In this state, the outer hoop muscles 20a and the inner hoop muscles 20b are placed on the temporary assembly pins 44 and temporarily fixed, and the six stages of hoop muscles 20 are temporarily assembled in an annular shape.

Then, as shown in FIG.
Is connected to the upper end of each hoop muscle supporting member 24, lifted up, and the hoop muscle supporting member 24 is pulled out from the insertion portion 40.

The hanging jig 46 is capable of being hung from the hanging hook 50 via the wire 48 and has a ring member 52 having a diameter corresponding to the diameter of the hoop muscle 20, and the hoop muscle supporting member 24 of the ring member 52. The hanging wire 54 is hung from six corresponding positions.

The lower end of the hanging wire 54 is connected to the upper end of the hoop muscle supporting member 24 so that the hoop muscle supporting member 24 can be lifted vertically.

Then, when the hoop muscle supporting member 24 is lifted by the lifting jig 46 in a state where the temporary assembling of the six stages of the hoop muscles is completed, the six stages of the temporary assembly to the hoop muscle supporting member 24 are performed. The hoop muscle 20 is lifted horizontally,
In this state, as shown in Fig. 1 (3), the temporarily assembled hoop muscles 20 of a plurality of stages are carried into the shaft 10, and the hoop muscles 20 are bound to the setup muscles 14 at a predetermined position. Set pin 4
4 is pulled out, and only the hoop muscle supporting member 24 is lifted and taken out.

The temporary assembly of the plurality of steps of the hoop muscles 20, the loading into the vertical shaft 10, and the binding of the hoop muscles 20 to the setup muscles 14 are repeated, for example, six times to connect the hoop muscles 20 to the scaffold. Repeat with 12.

When the temporarily assembled hoop muscle 20 is carried into the shaft 10, the scaffold 12 for mounting the setup muscle 14 is removed, and the temporarily assembled hoop muscle is provided between the inner wall of the shaft 10 and the scaffold 12. 20 is left so that a space for installation can be left.

As a result, the hoop-shaped hoop muscle 20 can be surely inserted into the gap between the inner wall of the shaft 10 and the scaffold 12, and the hoop muscle 20 suspended by the hanging jig is It can be loaded vertically while maintaining the horizontal state.

By dividing the hoop muscles 20 into a plurality of stages and temporarily assembling them, a plurality of stages of the hoop muscles 20 can be collectively hung and attached in the vertical shaft 10, and the number of times of hang-down work can be reduced. Moreover, the hoop muscles 20 can be hung down without interfering with the scaffolding 12, the number of scaffolding assembling and disassembling operations can be reduced, and the construction period and cost can be shortened.

Further, since the hoop muscle 20 is assembled on the ground, the work efficiency is good and the accuracy of the bar arrangement can be good even if the hoop muscle 20 becomes thick.

Next, as shown in FIG. 1 (4), the vertical shaft 10
Insert the outer main muscle 56a and the inner main muscle 56b into the
6a and inner hoop muscle 20a, inner main muscle 56b and inner hoop muscle 2
0b are connected respectively.

Next, as shown in FIG. 1 (5), the scaffold 12
Is dismantled and shipped to the ground.

Then, in this state, the concrete placing pipe 58 is arranged in the vertical shaft 10,
A concrete 60 is placed from the concrete placing pipe 58 into the vertical shaft 10 to form a deep foundation pile.

The present invention is not limited to the above embodiment, but can be modified into various forms within the scope of the gist of the present invention.

For example, in the above-described embodiment, the case where the shaft rebar assembling method is used for constructing the deep foundation pile has been described, but the present invention is not limited to this example, and a shaft using cast-in-place concrete such as a starting shaft or a reaching shaft is used. It can also be used for construction.

Further, in the above-mentioned embodiment, the base member of the assembling apparatus is composed of the base plate and the base mold member, but the present invention is not limited to this example, and the stand member is not directly attached to the base plate or the base plate is not used. It is also possible to use those in which the base mold members are directly joined to each other.

Further, in the above embodiment, the setup muscles are attached while the scaffold is assembled, but the setup muscles may be installed in advance on the liner plate.

Although six hoop muscle supporting members are used, three or more hoop muscle supporting members may be used.

Furthermore, when temporarily assembling the hoop muscles with the assembling apparatus, main muscles having a length corresponding to the number of steps may be temporarily assembled at the same time to connect the main muscles in the shaft.

Further, the temporary assembling means is not limited to the one using the hole and the pin, but the hoop muscle supporting member may be provided with the projecting member so as to be foldable.

Further, in the above-mentioned embodiment, the inner and outer double hoop muscles and main muscles are arranged, but it is also possible to form a single muscle arrangement.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a method for assembling a vertical shaft rebar according to an embodiment of the present invention, where (1) shows a mounting state of scaffolds and setup rebars, and (2) shows a temporarily assembled state of hoop rebars. ,
(3) shows the loading state of the hoop muscles, (4) shows the insertion state of the main muscles, (5) shows the disassembly and delivery state of the scaffold,
(6) shows the concrete pouring condition.

FIG. 2 is a side view of the assembly device.

FIG. 3 is a plan view of the assembling apparatus.

FIG. 4 is a sectional view showing a stand member and a temporary assembling means of the assembling apparatus.

[Explanation of symbols] 10 shafts 12 scaffolding 14 Setup muscle 16 above the ground 18 Assembly device 20 hoop muscles 22 Base member 24 Hoop muscle support member 26 Temporary assembly means 32 Stand member 42 Temporary assembly hole 44 Temporary assembly pin 46 fishing jig 56a Outer main muscle 56b inner main muscle

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yuji Nii             Toda Ken 1-7-1 Kyobashi, Chuo-ku, Tokyo             Inside the corporation (72) Inventor Keiichi Ishibashi             Toda Ken 1-7-1 Kyobashi, Chuo-ku, Tokyo             Inside the corporation (72) Inventor Teruhiko Yamaguchi             Toda Ken 1-7-1 Kyobashi, Chuo-ku, Tokyo             Inside the corporation (72) Inventor Atsushi Ichinose             Toda Ken 1-7-1 Kyobashi, Chuo-ku, Tokyo             Inside the corporation F-term (reference) 2D041 AA01 BA33 DA03 EB10

Claims (5)

[Claims] 1. A step of forming a scaffold for assembling a reinforcing bar in an excavated shaft, a step of temporarily assembling a hoop bar into a plurality of stages using an assembling device on the ground around the shaft, in an annular manner, A step of sequentially loading the temporarily assembled hoop muscles of the plurality of stages into the shaft and connecting the hoop muscles of each stage to the shaft using the scaffold, and using the scaffold by inserting the main muscle into the shaft. And a step of connecting the main bar and the hoop bar with each other, and a step of disassembling the scaffold and carrying out the shaft, the shaft rebar assembling method. 2. The assembly device according to claim 1, further comprising a hoop muscle support member that is detachably erected at least at three locations with respect to the base member, and a plurality of hoop muscles are provided for the hoop muscle support member. A method of assembling a vertical shaft rebar, comprising a step of lifting up the hoop reinforcement supporting member after carrying out temporary step assembly, loading the temporarily assembled hoop reinforcement into a shaft, and carrying out only the hoop reinforcement supporting member after loading. . 3. A base member having stand members at at least three positions corresponding to the diameter of the hoop muscles, and at least three hoop muscles detachably erected on the base member via the stand members. An assembling apparatus comprising: a support member; and a plurality of temporary assembling means for temporarily assembling a plurality of stages of hoop muscles on the hoop muscle supporting member in an annular shape at a predetermined pitch. 4. The temporary assembly means according to claim 3, wherein the temporary assembly means is a plurality of temporary assembly holes formed at a predetermined pitch in the hoop muscle support member, and temporary meshes inserted into the temporary assembly holes to support the hoop muscles. An assembling apparatus having a combination pin. 5. The assembly according to claim 3, wherein the temporary assembly means includes a plurality of temporary assembly pins that are provided on the hoop muscle supporting member so as to be foldable at a predetermined pitch and that support the hoop muscle. apparatus.