JPH045308A - Reinforcing steel cage - Google Patents

Abstract

PURPOSE:To make a pressurizing expansion process possible in a part for size expansion by forming an outer cage through a process of connecting together longitudinal steel bars through a flexible rope of high strength fiber or the like and connecting inner and outer cages to each other by an arm through a hinge part. CONSTITUTION:An inner cage 6 is formed by connecting together longitudinal steel bars 8 with hoop bars 9, An outer cage 7 is formed by connecting together longitudinal steel bars 8' by flexible ropes 11 of high strength fiber and tightening them by binding wires 12. A steel bar cage is formed by arranging the lower part of the inner cage 6 in the outer cage 7 and connecting a flat bar 10 to the lower end of the steel bar 8' by an arm 14 through a hinge part 13 and connecting together the steel bars 8,8' by an arm 15 through the hinge part 13. Further the steel bar cage is inserted into a hole which has its bottom part expanded in its size, and when the bottom positions of both cages 6, 7 approach each other, the arm 14 is folded outward so that the arm 5 may be placed in its horizontal attitude to extend the rope 11, resulting in the pressurized expansion of the outer cage 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a reinforcing cage used in the construction of cast-in-place concrete piles.

[Conventional technology]

When using cast-in-place concrete piles in the construction of a building with a basement, as shown in Figures 8 to 10, dig a hole 1 from the ground with a drilling device, insert the reinforcing bar cage 2 into this hole 1, and then , the basement part is filled with concrete 3 to the required depth, the upper part is backfilled 4, and then the roots of the basement part are cut 5.

The reason why the hole is drilled from the ground surface prior to root cutting 5 is to take into account the difficulty of setting it on the ground after root cutting 5, since the pile excavator is large. be.

In addition, the reinforcing bar cage 2 is placed in the hole 1 in order to prevent it from lifting up.
Insert a piece with the same length as the depth into hole 1.
Cut and remove along with.

[Problem to be solved by the invention]

As mentioned above, the upper part of the hole 1 and the upper part of the reinforcing bar cage 2, which correspond to the basement part, will eventually become unnecessary, so it is desirable to have as few as possible.

However, there is no construction technology for piles in which only the upper part of the unnecessary part is made smaller in diameter.

In addition, as a special type of pile, there is an enlarged-diameter cast-in-place pile with an enlarged diameter at the bottom of the pile.

Various types of excavators have been proposed for the construction of such diameter-expanding piles.
Expanding drilling is possible. However, since a regular reinforcing bar cage is used, the reinforcing bar cage does not extend around the enlarged diameter portion of the excavation hole, which is disadvantageous against bending moments.

An object of the present invention is to eliminate the disadvantages of the conventional example, and to provide a reinforcing bar cage that can be inserted into a hole whose bottom part is enlarged in diameter, and which can be pushed and expanded using this enlarged diameter part.

[Means for Solving the Problems] In order to achieve the above object, the present invention consists of an inner basket and an outer basket into which the lower part of the inner basket enters, and the outer basket is made of flexible high-strength fiber as a substitute for the hoop muscle. A rope is used to connect the vertical reinforcing bars with each other, and a flat bar is provided at the bottom of the outer basket to connect the lower end of the vertical reinforcing bars with an arm that bends outward via a hinge. The gist is that the inner cage and the outer cage are connected by an arm via a hinge section.

[Function] According to the present invention, since the outer cage uses a flexible rope made of high-strength fiber instead of the hoop reinforcement, the vertical reinforcing bars are spaced apart depending on whether the flexible rope is stretched or loosened. It is subject to change.

Therefore, when inserted into the hole, the inner cage is slightly shifted upwards relative to the outer cage, the arm connecting the inner cage and the outer cage is diagonal, and the distance between the vertical reinforcing bars of the outer cage is narrow. In other words, it is in a folded state.

In this state, it can be inserted from the upper part of the hole, which does not expand in diameter.

When the rebar cage reaches the bottom of the hole and the bottom positions of the inner and outer cages approach each other, the arm is also raised horizontally, pushing the outer cage to spread out laterally at the bottom of the hole, which has expanded in diameter.

[Example] Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a side view showing one embodiment of the reinforcing bar cage of the present invention.
The reinforcing cage of the present invention consists of an inner cage 6 and an outer cage 7.
It has a heavy cage structure.

Of these, the inner cage 6 may be the same as a normal reinforcing cage,
Vertical reinforcing bars 8 were connected by circular hoop bars 9. In the figure, 10 indicates a flat bar.

The outer cage 7 is into which the lower part of the inner cage 6 enters, and instead of connecting the vertical reinforcing bars 8° with the circular hoop bars 9, they are connected with a flexible rope 11 made of high-strength fibers such as carbon fiber or aramid fiber. did.

The flexible rope 11 and the vertical reinforcing bars 8' may be connected using binding wires 12.

Further, the outer basket 7 has a flat bar 10 only at the bottom, and the flat bar 10 and the lower end of the vertical reinforcing bar 81 are connected by an arm 14 via a hinge part 13. The arm 14 is arranged between the flat bar 10 and the lower end of the vertical reinforcing bar 8' so as to be bent outwardly.

In addition, the vertical reinforcing bars 8' of the outer cage 7 and the vertical reinforcing bars 8 of the inner cage 6
are connected by arms 15 at appropriate intervals (2 to 3 m) in the vertical direction, and the arms 15 are also connected via hinge parts 13.

FIGS. 2 and 3 show the arm 14.15 and the hinge part 13.
This figure shows the details of this, and employs a pin joint structure in which the ends of the flat flange bodies are overlapped and connected by pins 16. Further, when a reinforcing bar is used for the arm 14, the end of this flat plate-shaped flange is provided in a holder 17 into which the end of the reinforcing bar or the 8° end of the vertical reinforcing bar is screwed.

The hinge part 13 where the fir reinforcing bar 8 of the inner basket 6 and the arm 15 are connected is formed by providing the flat flange body on the holder 17' through which the vertical reinforcing bar 8 is inserted, and attaching the flat flange body at the end of the arm 15 to this. They are joined using stack pins 16.

Next, how to use it will be explained.

As shown in Fig. 5, the lower part 1a is excavated using an excavator for diameter expansion.
A hole 1' is drilled in which the diameter of the steel bar increases, and the reinforcing steel cage of the present invention is suspended in this hole 1'.

When inserted into the hole 1', the inner basket 6 is slightly shifted upward (approximately 20 C11) relative to the outer basket 7, and the arm 15 connecting the inner basket 6 and the outer basket 7 is slanted. Since the arm 14 is also vertical, and the flexible rope 11 is slack, the outer cage 7 has a narrow interval of 8° between the vertical reinforcing bars, and is in a folded state.

In this state, the reinforcing bar cage can be inserted from the upper part 1b of the hole 1'' whose diameter does not expand.

As shown in FIG. 6, when the rebar cage reaches the bottom of the hole 1' and the bottom positions of the inner cage 6 and outer cage 7 approach each other, the arms 14 are directed outward in a pantograph manner, as shown in FIG. The arm 15 is also raised horizontally, and the slack flexible rope 11 is tightened, and the lower part 1a of the 1° diameter hole is bent.
Then, the outer basket 7 is pushed out so that it spreads out laterally.

After the reinforcing cage is set within 1° of the hole in this way, the tremie pipe 18 is inserted into the inner cage 6, and the concrete 3 is poured.

If the upper part 1b of the hole 1° is to be used as the basement part, concrete 3 is poured only in the expanded diameter lower part 1a, as described above.
The upper part 1b will be backfilled and the roots in the basement will be cut.

In addition, in the case of an expanded diameter pile, the entire 1° hole may be filled with concrete 3 to form the pile.

In the above embodiment, the outer basket 7 has a flat par 1 on the bottom.
0, and the flat par 10 and the lower end of the vertical reinforcing bar 8' are connected by an arm 14 via a hinge part 13, but depending on the case, the flat par 10 may be omitted, and the arm 14 may also be unnecessary. good.

(Effects of the Invention) As described above, the reinforcing bar cage of the present invention can be inserted into a hole whose bottom part has an enlarged diameter, and can be pushed and expanded using this enlarged diameter part.

In recent years, buildings being planned on waterfronts and other areas are required to have basements because their heights are being restricted. Moreover, because the supporting ground is deep, the piles will have to be placed under the basement.

In this case, there is no need for piles in the basement area, so if the reinforcing cage of the present invention is used, the basement area of the piles can be made as small as possible, the amount of holes drilled and the amount of backfilling soil reduced, and root cutting work is reduced. This reduces the chance of the mountain-stopping wall falling inward, increasing safety.

In addition, in the case of expanded diameter piles, reinforcing bars can be effectively placed in the expanded diameter portion.

[Brief explanation of the drawing]

Fig. 1 is a side view of one embodiment of the reinforcing bar cage of the present invention in a folded state, Fig. 2 is a side view of the main parts of the same, Fig. 3 is a front view of the same, and Fig. 4 is a side view of the cage in an expanded state. 5 to 7 are side views showing the state of use, and FIGS. 8 to 10 are side views showing a conventional example. 1.1°...hole 1a...lower part 1b...
Upper part 2... Rebar basket 3... Concrete 4... Backfill 5... Root cutting 6... Inner basket 7... Outer basket 8.8'
... Vertical reinforcing bar 9... Hoop bar 10... Flat par 11... Flexible rope 12... Binding wire
13... Hinge part 1415... Arm 16... Pin 17.17... Holder 18... Tremy tube

Claims (2)

[Claims] (1) It consists of an inner cage and an outer cage into which the lower part of the inner cage enters.The outer cage uses a flexible rope made of high-strength fiber instead of the hoop reinforcement, and this flexible rope connects the vertical reinforcing bars. A steel cage characterized in that the inner cage and the outer cage are connected by an arm through a hinge part. (2) It consists of an inner cage and an outer cage into which the lower part of the inner cage enters.The outer cage uses a flexible rope made of high-strength fibers as a substitute for hoop reinforcement, and this flexible rope connects vertical reinforcing bars to each other. In addition, a flat bar was provided at the bottom of the outer car that was connected to the lower end of the vertical reinforcing bar by an arm that bent outward through a hinge, and the inner and outer cages were connected by an arm through the hinge. A steel cage characterized by: