JPH0565652B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a construction method for sinking a hollow foundation pile into the ground and a pile head filler used when sinking the hollow foundation pile.

<Prior art> As this type of construction method, conventionally, for example, the method shown in FIG. 5 (hereinafter referred to as conventional example 1) or the method shown in FIG.
(hereinafter referred to as conventional example 2) is known.

In conventional example 1, cement milk or the like is poured into an excavated hole 1 as a hardening agent 2, and then a hollow foundation pile 3 is placed in the excavated hole 1.
Fill the hollow part 3b of the foundation pile 3 with a foot hardening hardening agent 2, and when the foot hardening hardening agent 2 hardens and hardens the foot, the foundation pile 3 is cut to a predetermined height H,
This is a construction method in which reinforcing bars forming the base of the structure are fixed to the cut pile head 3a.
In addition, the reference numeral 10 in the figure is a holder for sinking the foundation pile 3.

Also, in conventional example 2, similar to conventional example 1, hollow foundation pile 3
After the foundation pile hardening agent 2 has not yet hardened, the root hardening agent 2 inside the head 3a of the hollow foundation pile 3 is removed with water jet, and the structure is poured into the pile head inner cavity 3A formed there. This is a construction method that fixes the reinforcing bars that make up the base of the building. In addition, the reference numeral 11 in the figure is a spray removal device for the root hardening and curing agent.

<Problem to be solved by the invention> In conventional example 1, as shown in FIG.
Because the head 3a of the foundation pile 3 is filled with the hardening agent 2, cutting the foundation pile 3 at a predetermined height H after this has hardened takes several times the time it would take to cut a hollow one. It takes. Moreover, the pile head 3a
In order to fix the base part of the structure to the pile head, it is necessary to further process the pile head to form a hollow space inside the pile head.
This led to longer construction periods and increased costs.

On the other hand, Conventional Example 2 solves the above-mentioned difficulties, but since the unhardened root hardening agent is removed by jet water to form the pile head inner cavity 3A, the root hardening inside the hollow foundation pile 3 is The hardening agent 2 contains a large amount of water, causing a change in the composition of cement milk and the like. Furthermore, if the timing of spray removal is missed and the root hardening curing agent is hardened, the same problem as in Conventional Example 1 will occur. Moreover, since the injection removal device 11 is required, an increase in cost is inevitable.

To avoid such inconvenience, a hollow foundation pile with a closed bottom end may be used. However, as shown in Fig. 4, if the length of the foundation pile 3 is a little short, the foot hardening agent 2 may be Flowing in from the pile head inner cavity 3A
There is a risk of blocking the If this pile cap internal space 3A is blocked, the base portion 8 of the structure cannot be fixed, as will be described later with reference to FIG.

The present invention has been made in view of the above circumstances, and has the following features: (a) to easily secure and form the hollow space inside the pile head; (b) to facilitate cutting of the pile head; and (c) to fill the hollow foundation pile with the hollow foundation pile. The technical challenges are to ensure that the root hardening agent used in the construction site does not change its composition, and (2) to shorten the construction period and reduce costs.

<Means for Solving the Problems> In order to solve the above problems, the present invention is configured as follows.

That is, the first invention is a hollow foundation pile sinking construction method similar to the conventional method, in which a pile head filler is loaded in advance into the head of the hollow foundation pile, and after the hollow foundation pile is completely sunk, the pile head is filled. This is a construction method for hollow foundation piles, which is characterized by forming a hollow space inside the pile head by removing a tool.

The second invention is a pile head filler made of a synthetic resin material and filled into a foundation pile.

<Function> In the first invention, since the hollow foundation pile is sunk with the pile head filler installed in advance in the head of the hollow foundation pile, after the sinking of the hollow foundation pile is completed,
When the pile head filler is removed, a pile head internal cavity is formed there.

In the second invention, the pile head filler used in the first invention is made of a synthetic resin material such as pile corulu, and is lightweight and inexpensive, and can be easily attached to and removed from the head of the hollow foundation pile. Even after the root hardening hardening agent has hardened, the filling tool can be broken and easily removed.

<Example> FIG. 1 is a vertical cross-sectional view of a main part showing a state in which a hollow foundation pile according to the present invention is sunk.

That is, an excavated hole 1 is made in the ground by pre-boring, a hardening agent 2 such as cement milk is poured into the excavated hole 1, and a hollow foundation pile 3 with both ends open is sunk into the excavated hole 1. has been done.

A pile head filler 4 is loaded in advance into the head 3a of the hollow foundation pile 3 and fixed with a stopper 7.

This pile head filler 4 is made of a synthetic resin material called pile cork, and has a punch hole 5 in its axial center, and by sinking the hollow foundation pile 3, the hollow part 3b of the foundation pile The punch hole 5 is filled with a hardening agent 2 such as cement or mortar.

After completing the sinking of the hollow foundation pile 3, the pile head filler 4 is removed, and a pile head inner cavity 3A is formed there.

In addition, Figure 2 shows another embodiment of the pile head filler 4, in which Figure A shows half of the pile head filler 4 formed vertically in half, and Figure B shows a set of the same halves formed in the skin. It is a perspective view illustrating what is integrally connected by the connection part 4a, and it is a perspective view which takes into consideration the convenience in handling.

The hardening agent filled in the punching hole 5 remains in the pile cap inner cavity 3A formed as described above, but if it is unnecessary, it can be removed and the base portion 8 of the structure shown in FIG. The reinforcing bars that make up the structure are inserted, and the base portion 8 thereof is fixed.

Note that reference numerals 8a and 8b in the figure are metal fittings for fixing the base portion.

In the above embodiments, the hollow foundation pile is of the type with both ends open, but it can also be applied to a type of hollow foundation pile with the lower end closed. Further, the cross-sectional shape of the pile head filler is not limited to a circular shape, but is formed to match the hollow shape of the foundation pile.

In addition, in the present invention, the material etc. of the pile head filler are not limited as long as it forms the hollow space inside the pile head.

In addition, in the above embodiment, since the hollow foundation pile with both ends open was illustrated, the pile head filling tool has a hole that communicates the hollow part in the foundation pile to the atmosphere. Foundation piles do not necessarily require punched holes, and can be implemented with appropriate modifications.

<Effects of the Invention> As is clear from the above explanation, in the first invention, a pile head filler is loaded into the head of a hollow foundation pile, and a hollow space inside the pile head is secured and formed when the hollow foundation pile is sunk. By doing so, the following effects are achieved.

(b) By simply loading a pile head filler into the head of a hollow foundation pile in advance and sinking the foundation pile, a hollow space inside the pile head can be easily secured and the intrusion of earth and sand and concrete can be prevented.

(b) When cutting the pile head to the specified height,
Since it is not solid like Conventional Example 1, it can be easily cut.

C. Conventional Example It is safe because there is no need to remove the unhardened root hardening hardening agent with sprayed water, and the composition of the root hardening hardening agent does not change.

In addition, in the second invention, the pile head filler is made of a lightweight and inexpensive synthetic resin material, and does not cause any adverse effects during installation, and can also be easily attached to and removed from the foundation pile head. produces the following effect.

(d) There is no need for a spray removal device or the like as in Conventional Example 2, and the overall cost can be reduced and the construction period can be shortened.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a main part illustrating the state of sinking a hollow foundation pile according to the present invention, Fig. 2 is a perspective view showing another embodiment of a pile head filler, and Fig. 3 is a hollow part inside the pile cap. Fig. 4 is a vertical cross-sectional view of a main part illustrating a state in which the base part of a structure is fixed, Fig. 4 is a longitudinal cross-sectional view of a bottom-end closed type hollow foundation pile, and Figs. 5 and 6 are main parts showing a conventional example. FIG. 1... Excavation hole, 2... Root hardening agent, 3... Hollow foundation pile, 3a... Head of hollow foundation pile, 3A...
Hollow part inside the pile head, 3b... Hollow part inside the foundation pile, 4...
Pile head filling tool.

Claims (1)

[Claims] 1. Injecting a foot hardening agent 2 into the excavated hole 1, sinking the hollow foundation pile 3 into the excavated hole 1, and fixing the base part 8 of the structure in the hollow part 3A of the pile head. In the hollow foundation pile construction method, a pile head filler 4 is loaded in advance into the head 3a of the hollow foundation pile 3, and after the hollow foundation pile 3 is completely sunk,
A method for constructing a hollow foundation pile, characterized in that a pile head inner cavity 3A is formed by removing the pile head filler 4. 2. The pile head filling tool 4 according to claim 1, which is made of a synthetic resin material.