JPH0118215B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of foundation piles such as column bases of buildings, bridges, and piping stanchions in the fields of civil engineering and architecture, and the connection between steel pipe piles constituting the foundation piles and structures. It relates to a method, and more specifically, it aims to simplify the structure of foundation piles, simplify the work of connecting the steel pipe piles that make up the foundation piles and structures, and significantly reduce the number of work steps. This is the purpose.

When forming the foundation of a structure with steel pipe piles, conventionally, the steel pipe piles and the structure are joined in the following construction order, as shown in FIGS. 1 and 2.

That is, Driving steel pipe pile 1 as a foundation pile.

Excavation to the bottom of the foundation concrete.

Placing base concrete 2 (including assembly of reinforcing bars).

Anchor bolts 4 for attaching a structure 6, which is a steel column, are set in a predetermined posture.

Placement of standing concrete 3 (including assembly of reinforcing bars).

Construction of mortar 5 to directly receive structure 6.

Installation of the structure 6 onto the standing concrete 3 using the anchor bolts 4.

This will be achieved in the following order.

The following drawbacks can be pointed out in the above-described conventional method for joining steel pipe piles and structures.

In other words: (1) Since the entire foundation becomes extremely large, the amount of construction work will increase.

(2) The load borne by the steel pipe pile 1 needs to support not only the load of the structure 6 but also the weight of the concrete foundation consisting of the base concrete 2 and rising concrete 3 and the earth and sand.
The number of steel pipe piles 1 increases.

(3) Due to the large amount of work and types of work, it will take a considerable number of days to complete.

(4) Because the foundation is deeper than the ground surface, excavation work may cause underground water to spring up in some places, making it necessary to treat wastewater.

(5) Overall construction costs are high.

It is possible to point out shortcomings such as:

The present invention was devised to eliminate the drawbacks of the conventional example described above.The drawback of the conventional example is that it is not possible to directly connect the foundation pile and the structure, so it is necessary to pour base concrete. Focusing on the problem that occurs due to the failure of foundation piles, we created a structure that allows the foundation pile to be directly connected to the structure, and also formed the steel pipe pile that is a component of the driven foundation pile. The space formed at the top, that is, the upper end, is used as a part for fixing anchor bolts, and the anchor bolts are fixed directly to the steel pipe pile.
The structure is directly connected to the driven steel pipe piles.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 3 to 6.

Note that the same parts as those in the conventional example shown in FIGS. 1 and 2 are indicated by the same reference numerals.

The foundation pile K according to the present invention includes a steel pipe pile 1, a filling 7 made of concrete or mortar cast in the top space of the steel pipe pile 1, and a filling 7 extending upward from the upper end of the steel pipe pile 1. The anchor bolt 4 is fixed to the steel pipe pile 1 in the form shown in FIG.

That is, since the foundation pile K according to the present invention has the anchor bolt 4 integrally provided, the anchor bolt 4 can be attached without interposing the base concrete 2 as in the conventional example shown in FIGS. 1 and 2.
By using this, the structure 6 can be directly connected and fixed to the foundation pile K.

In addition, the structure 6 is added to the foundation pile K according to the present invention.
When joining and fixing, it is actually preferable to provide mortar 5 on top of the filler 7, as in the illustrated embodiment, in order to obtain accurate horizontal level.

The method of forming the foundation pile K according to the present invention is not particularly limited, but from the viewpoint of actual operation, the method of forming the foundation pile K and the structure 6 at the same time as forming the foundation pile K.
It is advantageous to join.

In other words, the structure 6 supported by the foundation pile K
When constructing, in the top space of the steel pipe pile 1 after driving,
A foundation pile K is formed by directly fixing an anchor bolt 4 with a filler 7 formed using concrete or mortar in such a manner that the anchor bolt 4 extends upward from the upper end of the steel pipe pile 1,
The structure 6 mounted on this foundation pile K is integrally connected to this foundation pile K by the anchor bolt 4.

In addition, in this method of joining the foundation pile K and the structure 6, as described above, the laying mortar 5 is provided on the filler 7 in which the anchor bolt 4 is fixed, and the structure 6 is attached to the foundation via this laying mortar 5. It is best to place it on the pile K.

When the steel pipe pile 1 is driven into the ground surface, the earth and sand surface inside the steel pipe pile 1 is compressed and lowered due to friction with the inner surface of the steel pipe pile 1 as the steel pipe pile 1 is driven. It will be located at a lower level than the surrounding ground level.

The amount of descent of the earth and sand surface inside the steel pipe pile 1 varies depending on the size of the steel pipe pile 1, soil quality, etc., but is generally about 3 to 4 m, and in the case of a steel pipe pile 1 with a small diameter. It can reach up to 10m.

In this way, the top of the driven steel pipe pile 1, that is, the upper end, is covered with the above-mentioned falling earth and sand.
A space will definitely be created.

Using the space formed at the upper end of the steel pipe pile 1, the anchor bolt 4 is fixedly installed in this space with a filler 7.

The anchor bolt 4 fixed to the upper end of the steel pipe pile 1 by the filler 7 extends upward from the upper end of the steel pipe pile 1 and is firmly fixed.

After the middle filling 7 has solidified, that is, after the anchor bolt 4 is fixed by the middle filling 7, on the upper surface of the middle filling 7,
A mortar 5 is applied and formed to improve the accuracy of horizontal and vertical assembly of the structure 6.

This mortar 5 is intended to improve the accuracy of horizontal and vertical assembly of a structure 6 that is assembled to a foundation mainly composed of steel pipe piles 1, so naturally the anchor bolts 4 are attached to the mortar 5.
It will pass through and extend upward.

In this way, the foundation pile K is completed by the steel pipe pile 1, the filler 7, the anchor bolt 4, and the mortar 5. When the foundation is completed at the same time as the foundation pile K, the mortar 5
By installing the upper structure 6 on the foundation surface formed by this and tightening and fixing this structure 6 with anchor bolts 4, integral connection between the lower structure (foundation) and the upper structure (structure) is achieved.

FIGS. 5 and 6 show an example in which the method of the present invention is applied to joining a main column (steel column) that is a structure 6 of a factory building to a foundation.

In the example shown in Figs. 5 and 6, the construction will be explained in order: (1) Driving the foundation steel pipe pile 1 into the ground surface (after driving, a space of approximately 4 m will be created above the steel pipe pile 1). (This space was backfilled with earth and sand, leaving a 1m space above.) (2) In order to increase the adhesion between the inner surface of the steel pipe pile 1 and the filler 7, 16φ round steel 8 was It is welded and fixed to the inner surface of the steel pipe pile 1 in a ring shape.

(3) Anchor bolts 4 for achieving fixation between the structure 6 and the steel pipe pile 1 are assembled and attached into the steel pipe pile 1.

(4) Expanded concrete is poured into the upper part of the steel pipe pile 1 to form the filler 7, and the formation of the foundation pile K is completed.

(5) Apply adjustment mortar on the top surface of the filling 7 to form the bed mortar 5.

(6) Place the structure 6 on the mortar 5 and tighten the anchor bolts 4 with nuts.

With the above steps, the joining and fixing of the structure 6 to the foundation pile K (the part composed of the steel pipe pile 1, the anchor bolt 4, the filler 7, and the mortar 5), that is, the installation, is completed.

In addition, although the above-mentioned embodiment was explained with reference to an example in which the mortar 5 was previously applied on the upper surface of the filling material 7 and the structure 6 was placed and attached on top of this mortar 5, A liner 5', which is indicated by a chain double-dashed line in the drawing, is placed above the liner 5', and the structure 6 is placed on the liner 5', and the anchor bolt 4 is placed on the liner 5'.
It is also possible to apply the mortar 5 after tightening and fixing.

In this way, the method of joining the steel pipe pile 1, which is a constituent part of the foundation pile K, and the structure 6 can omit the conventional work such as excavation for the foundation and concrete pouring, and therefore, for example, as shown in Figs. 5 and 6. Conventionally, the construction work of the embodiment shown in Figure 1 would have taken 3 to 4 weeks, but according to the method of the present invention, the entire work could be completed in about one week.

In addition, since the overall structure is extremely simple, the number of man-hours required to complete construction can be significantly reduced, and material costs can also be significantly reduced.

Furthermore, since the structure 6 is directly attached to the upper end of the steel pipe pile 1 via the mortar 5, the number and type of equipment and tools required for construction work can be reduced.

As is clear from the above description, since the present invention has an integral anchor bolt, it is possible to directly mount and fix a structure, thereby omitting the troublesome construction and forming work of the foundation surface. Also, since the structure is simple, it is easy to manufacture, and it requires less man-hours, does not require special technology, and has fewer structural parts, so it is easy to construct, and it is easy to use as a foundation. It can simplify the structure of the combination with the building, and it can also significantly reduce the amount of construction work, so it has many excellent effects such as greatly reducing construction costs. be.

[Brief explanation of drawings]

Figures 1 and 2 show conventional examples.
FIG. 1 is a plan view, and FIG. 2 is a longitudinal sectional view. Third
The figures and FIG. 4 show an embodiment of the method of the present invention, with FIG. 3 being a plan view and FIG. 4 being a longitudinal sectional view. 5 and 6 show a specific example of the method of the present invention, with FIG. 5 being a plan view and FIG. 6 being a longitudinal sectional view. Explanation of symbols, K: Foundation pile, 1: Steel pipe pile, 2: Base concrete, 3: Standing concrete,
4: Anchor bolt, 5: Mortar, 6: Structure, 7: Filling, 8: Round steel.

Claims (1)

[Claims] 1. A steel pipe pile, and a filling made of concrete or mortar cast in the top space of the steel pipe pile,
and an anchor bolt fixed to the steel pipe pile in a form extending upward from the upper end of the steel pipe pile by the filling. 2. When constructing a structure supported by steel pipe piles, anchor bolts are directly fixed in the top space of the steel pipe piles with concrete or mortar in such a manner that the anchor bolts extend upward from the upper ends of the steel pipe piles. A method for joining a steel pipe pile and a structure, wherein the structure mounted on the steel pipe pile is integrally connected to the steel pipe pile by the anchor bolt.