JPH04124321A - Rigid joining of pile - Google Patents

Abstract

PURPOSE:To simplify work by fitting the cylindrical part of a rigid block in which anchor steel rods are firmly attached at the cylinder with an opening at the bottom, at outer part of the head of piles and pouring an expansion agent unto the space between the cylinder and the outer periphery of the pile to rigidly join the block at the head of pile by the expansion pressure. CONSTITUTION:After a support pile 2 is constructed, a base slab 21 is inwardly inserted in the head of the pile 2 and a reinforced plate 22 is arranged in the working chamber 5 of the caisson. The cylinder 3 of a rigidly joined block 1 is fitted at the outer periphery of the head of the pile 2. Next, an expansive agent 6 is poured from pouring inlets 33, 34 into each chamber A, B, and further, the expansive pressure of the expansive material 6 acts on the inner and outer faces of the pile 2 positioned between both chambers A, B in the respectively confronting direction to rigidly join the pile 2 and the cylinder 3.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a method for rigidly tying piles.

<Prior art> The caisson construction method with legs is known, in which supporting piles such as steel pipe piles or concrete piles are constructed deep underground before the caisson is sunk, and then the caisson is sunk and the caisson is supported by the supporting piles. It is being

In this construction method, it is important to ultimately pour concrete into the caisson's pressurized work chamber to integrate the support pile and caisson.

<Problems to be Solved by the Present Invention> In order to rigidly connect the support pile and the caisson, reinforcing bars may be placed integrally with the support pile in the work room.

However, because the use of open flame is prohibited in a pressurized workroom and the working time is short (limited), anchor bars are currently attached to the pile body using simple joining methods such as bolting. It is.

Therefore, it is desired to propose a technology that can rigidly connect reinforcing bars to pile bodies with simple operations.

<Object of the present invention> The present invention has been made in view of the above points, and an object thereof is to provide a method for rigidly connecting reinforcing bars to one pile body with simple operations. Al.

<Means for solving the problems> The present invention provides a method for rigidly connecting anchor bars to the pile head,
A rigid block is fixed to a cylindrical part with only the lower opening open, and the anchor rod is integrally attached to the cylindrical part. This method of rigidly connecting piles is characterized by injecting engraving material into the sealed space of the pile and rigidly connecting the rigidly connecting block to the propagation head using the engraving pressure of the engraving material.

<Description of the Present Invention> Hereinafter, main members used in the present invention will be explained with reference to the drawings.

In this example, a case where the present invention is applied to a steel pipe pile will be explained.

<A> Rigid block FIG. 1 shows an overall view of the rigid block, and FIG. 2 shows a central sectional view of the rigid block 1 when attached to the pile body 2.

The rigid block 1 consists of a steel cylindrical part 3 and an anchor bar 4 fixed to the cylindrical part 3, and is manufactured in advance at a factory or the like.

<Mouth> Cylindrical part The cylinder part 3 is a cylinder whose upper mouth is closed and whose lower mouth is open, and has a ring-shaped projecting part 31 at its lower part.

The inner diameter of the overhanging portion 31 is set to be approximately equal to or slightly smaller than the outer diameter of the pile body 2, and a sealing material 32 is provided around the entire circumference of the overhanging portion 31 to ensure close contact with the outer circumference of the pile body 2. It is installation.

In addition, injection ports 33 and 34 for filling the engraving material into the inside and outside of the pile body 2 are provided on the ceiling of the cylindrical portion 3, and piping is provided so that the engraving material can be injected from an injection device (not shown). .

In the figure, reference numeral 35 indicates an exhaust hole opened at an appropriate position in the cylindrical portion 3.

<C> Anchor muscle The anchor muscle 4 is composed of a knitted body of a plurality of longitudinal reinforcements 41 and tie reinforcements 42, and the lower part of each longitudinal reinforcement 41 is fixed to the outer peripheral surface of the cylindrical portion 3 by welding or the like.

<2> Engraving material As the engraving material, an engraving agent or engraving cement whose main ingredient is quicklime can be used.

<Effect> Next, the construction method will be explained.

<A> Construction of support piles (Figure 2) A plurality of support piles 2 are constructed in the ground where the caisson is to be sunk using conventional construction methods.

<Exit> Sinking the caisson (Fig. 2) Next, while applying pressure to the working chamber 5 at the bottom of the caisson and excavating the ground, sink the caisson until the head of the support pile 2 is exposed inside the working chamber 5. .

Then, the bottom plate 21 is inserted into the head of the pile body 2 made of steel pipe, and the cross-shaped reinforcing plate 22 is inserted.

<C> Setting of the rigid block (FIG. 2) Next, the cylindrical portion 3 of the rigid block 1 is mounted on the head of the pile body 20.

As a result, an inner chamber A having a sealed structure and an outer chamber B having an annular sealing structure around the inner chamber A are defined in the rigid block l.

<2> Injection of expansion/relaxation material (Fig. 3) Merely mounting the rigid block 1 on the pile body 2 will not rigidly connect the two.

Therefore, the engraving material 6 is injected into each of the chambers A and B through the injection ports 33 and 34.

As a result, the engraving pressure of the engraving material 6 acts on the inner and outer surfaces of the pile body 2 located between the chambers A and B in directions facing each other, and the pile body 2 and the cylindrical part 3 are rigidly connected. .

After binding reinforcing bars (not shown) using the anchor bars 4 integrated with the cylindrical portion 3 as a foothold, concrete is poured to integrate the pile body 2 and the caisson.

<Other Examples> In the above embodiments, the case where the rigidly connected block 1 is rigidly connected to the pile body 2 made of a steel pipe has been described.

FIG. 4 shows a case in which the present invention is applied to a concrete pile or cast-in-place pile in which the head of the pile body 2 is filled with concrete.

In the case of this embodiment, the injection range of the engraving material 6 is between the pile body 2 and the cylinder part 3.
There is only an outer room B defined by .

When the pile body 2 is a cast-in-place pile, the excess concrete (deteriorated concrete) on the pile head is removed, and the surface of the pile body 2 is cleaned and prepared for chipping.

Effects of the Invention> Since the present invention is as explained above, the following effects can be obtained.

<A> Bed head treatment can be performed in a pressurized work room without using fire.

<Mouth> Since the work only requires setting the rigid blocks and pouring the engraving material, the work can be simplified, which is advantageous under pressure conditions where the work time is short and limited.

<C> When applied to cast-in-place piles, the amount of industrial waste generated can be reduced because it is only necessary to remove deteriorated conch notes.

(2) It can be rigidly connected to any pile body without being restricted by the cross-sectional shape of the pile body.

<E> It can be applied not only to pressure caissons but also to so-called lighting construction.

[Brief explanation of drawings]

Figure 1: Overall view of the rigid block used in the present invention Figure 2: Central sectional view of the pile head with the rigid block attached Figure 3: Central sectional view of the pile head when engraving material is poured Figure 4: Explanatory diagram of another embodiment

Claims (1)

[Claims] (1) In the method of rigidly connecting anchor bars to the pile head, a rigid block is used in which the anchor bars are integrally fixed to a cylindrical part with only the lower mouth open, and the cylindrical part of the rigid block is connected to the pile head. It is characterized by injecting an inflatable material into the annular sealed space formed between the pile and the outer circumference of the pile, and rigidly connecting the rigid block to the pile head by the expansion pressure of the inflatable material. Method of rigidly connecting piles.