JPS62197526A - Trussed pile and its construction - Google Patents

Abstract

PURPOSE:To easily construct a trussed pile by a method in which a custom-made pile is penetrated into soil cement, and while penetrating a truss into the soil cement wall formed, the custom-made pile is connected with the truss. CONSTITUTION:A soil cement column 3a is formed and soil cement columns 3b and 3c are then formed. Soil cement walls 5a and 5b are formed between the columns 3a and 3b and also between the columns 3b and 3c. A steel tubular pile 4 is penetrated into the soil cement column 3a, and cement mortar is poured into the hollow 11 of an angular hollow coupler 9. A truss 6 is penetrated into the soil cement wall 5a, and the flange 14a of a T-shaped coupler 14 is inserted into the hollow 11 to joint the pile 4 to the truss 6 in the soil cement. The construction of the truss portion as a horizontal resistance element can thus be made easier, and the trussed pile for supporting vertical horizontal forces can be stably constructed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a trussed pile constructed by a soil cement construction method and its construction method.

[Conventional technology]

The soil cement construction method involves rotating auger rods mounted on a traveling vehicle using electric power, etc., and injecting cement milk, etc., made of a cement-based hardening agent, from the center of the tip of each auger rod while drilling holes in the ground. A soil cement column or soil cement wall is formed by forcibly stirring using the stirring blades of the auger lot. In the case of soil-cement walls, a steel mold is press-fitted before the cement hardens, and this steel mold is used as a stress-bearing material, and the soil-cement wall functions as a water-impermeable retaining wall.

The support pile using this soil cement construction method is 1, for example, 12
As shown in Figure (al), a uniaxial soil-cement column 3 is formed by using a peripheral fixative with a small cement mixing ratio in the soft layer 1 as the injection material, and using a root hardening solution with a high cement mixing ratio in the supporting layer 2. However, before the soil cement pillar 6 is converted to cement, the steel pipe pile 4.
Prefabricated steel pipe concrete piles or prefabricated concrete piles are formed as built-in support piles.

[Problem that the invention seeks to solve]

When using nearly 100% of the bearing capacity of the above steel pipe piles, ready-made steel pipe concrete piles, or ready-made concrete piles, steel pipe piles,
Since the outer diameter DpY of the Suki steel pipe concrete pile or ready-made concrete pile is smaller than that of conventional piles, there is a problem that the bending rigidity and bending strength at the top of the pile tend to be insufficient.

To solve this problem, a pile foundation can be considered that supports vertical and horizontal forces by providing a truss at the head of the pile. This trussed pile foundation is a foundation that uses the minimum necessary steel materials and has a large horizontal resistance, but the construction method for the truss part is complicated, making it difficult to actually construct it. This invention was made to solve the problem of trussed piles and facilitates the construction of trussed piles.
The purpose of this project is to propose a construction method that can

[Means for solving problems]

The trussed pile according to the present invention includes a plurality of soil cement columns formed in the ground by the soil cement construction method, a soil cement wall formed between the column heads of the soil cement columns, and a press fit into the plurality of soil cement columns. steel pipe pile,
It consists of ready-made steel pipe concrete piles or ready-made concrete piles, and a truss that is press-fitted into the soil cement wall and connected to the already-made pile.

In addition, the method for constructing trussed piles according to the present invention involves creating a plurality of soil cement columns in the ground using the soil cement construction method, and before adding weight to the soil cement columns, a steel pipe pile, a ready-made steel pipe concrete pile, or a ready-made concrete pile is installed. A prefabricated pile consisting of piles is press-fitted into a soil-cement column, a soil-cement wall is created between the soil-cement columns before or after the pre-fabricated pile is press-fitted, and a truss is press-fitted into the soil-cement wall before the soil-cement wall hardens. At the same time, a trussed pile is formed by truss-like connection with a ready-made pile that is press-fitted into a soil-cement column.

[For production]

In this invention, slurry soil cement is created using the soil cement construction method, with a cylinder shape in the pile part and a wall shape in the truss part, and before the soil cement hardens, the ready-made pile and truss are press-fitted and connected to form a trussed pile.'' This makes construction of the truss part easier.

〔Example〕

FIG. 1 is a sectional view showing a trussed pile according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line AA of the embodiment shown in FIG. In the figure, 1 is a soft layer, 2 is a supporting layer, 6 is a soil cement column with an outer diameter of Ds, and 4 is a steel pipe pile press-fitted into the soil cement column 3.

5 is a soil cement wall provided at the upper end of the soil cement column 3; 6 is a truss having upper and lower chord members press-fitted into the soil cement wall 5 and connected to the steel pipe piles 4; and 7 is a superstructure.

The construction procedure of the trussed pile constructed as above will be explained. First, as shown in Fig. 5, the soil cement column 3a
Create.

Next, after creating the soil cement columns 5b and 3c, between the soil cement columns 3a and 3b and between the soil cement columns 3b and 5
Soil cement walls 5a and 5h are formed between c. After that, before the soil cement hardens, each soil cement) 3a, 3b
, 3c, press-fit the steel pipe pile 4.

As shown in FIG. 4 (al), the steel pipe pile 4 is provided with a hollow prismatic joint 9 formed by welding two steel sections 8 to the upper part of the IC side surface. There is a gap 10 in the radial direction, and a protective film such as cloth is provided on the upper and lower surfaces of the hollow prismatic joint 9 and the gap 10 to prevent soil cement from entering the hollow part 11 when the steel pipe pile 4t is press-fitted into the soil cement column 6a. 12 is stretched, and this maintenance fl!
5CVC is press-fitted.

After press-fitting the steel pipe pile 4, cement mortar is injected into the hollow part 11 of the hollow prismatic joint 9, and then the truss 6 is press-fitted into the soil cement wall 5a as shown in FIG. While destroying the protective film 12 of the hollow prismatic joint 9 of the steel pipe pile 4 with the joint 14 provided at the end, the hollow part 1
Insert the flange i aiv of the T-type joint 14 into the fi T-type joint 14 by hardening the cement mortar in the hollow part 11.
The steel pipe pile 4 and the truss 6 are fixed in a Y hollow prismatic joint 9 and connected in soil cement as shown in FIG.

In the above embodiment, after creating the soil cement wall, the steel pipe piles 4 are attached to each soil cement column 3a, 3b.

Although the case of press fitting into 3C is shown, each soil cement column 3
Even if the soil cement walls 5a, 5b are constructed after the steel pipe piles 4 are press-fitted into the a, 15b, and 5c, IC construction can be performed in the same manner as in the above embodiment.

In addition, in the above embodiment, the force explained in the case where the truss 6 having upper and lower chord members is used as the horizontal resistance element [, as shown in Fig. 6, the truss with the lower chord removed or the upper chord t-footing used for both] When the truss 6 is used, or when a panel 15'Y having shear resistance as shown in Fig. g7 is used in place of the truss, construction can be easily carried out in the same manner as in the above embodiment.

Furthermore, as shown in FIG. 8, it is possible to construct a trussed pile in the same manner as in the above embodiment by using a steel pipe pile 4 as the part of the antibody that contacts the truss 6 as a horizontal resistance element, and using a prefabricated concrete pile 17 below it. can.

Further, in the above embodiment, the case where the truss 6 is connected to the steel pipe pile 4 and the snack body has been explained, but it may also be connected in terms of Vcq as shown in FIG. When a T-shaped joint 14 is welded to the steel pipe pile 4 and a hollow prismatic joint 9 is attached to the truss 6 as shown in Fig. 10, or when a hollow prismatic joint 9 is attached to the steel pipe pile 4 as shown in Fig. 11. Welded and mutually outward L-shaped joints 16 at the ends of the truss 6
Even when two Y pieces are attached, the same effect as in the above embodiment can be achieved.

〔Effect of the invention〕

As explained above, the present invention is capable of press-fitting and connecting a truss with a steel pipe pile, a ready-made steel pipe concrete pile, or a ready-made concrete pile before soil cement conversion of a soil cement column or a soil cement wall. Therefore, the construction of the truss portion, which is a horizontal resistance element, is easy, and the trussed pile for supporting vertical and horizontal forces can be stably and easily constructed.

Furthermore, since the construction method is easy, it also has the effect of significantly reducing construction costs.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a trussed pile according to an embodiment of the present invention, Fig. 2 is a sectional view taken along line A-A of the above embodiment, and Fig. 5 shows a soil cement column and a soil cement wall of the above embodiment. Cross-sectional view, Fig. 4 (al, (bl) is a construction process explanatory diagram of each of the above embodiments, Fig. 5 is a sectional view showing a part of the above embodiment, @ Fig. 6, Fig. 7, Fig. 8 , Figures 9-10, 11
The figures are explanatory diagrams showing other embodiments, and Fig. 12 (at,
(BL is an explanatory diagram showing support piles by the conventional soil cement construction method. 3.3a, 5b, 3C... Soil cement column, 4...
・Steel pipe piles, 5.5a, 5b... Soil cement wall, 6
···truss. Agent Patent Attorney Tadashi Sato Figure 1 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 81 Figure 9 Figure 10 1! 11 W! JFigure 12 (a) (b)

Claims (3)

[Claims] (1) A plurality of soil cement columns formed in the ground using the soil cement method, a soil cement wall formed between the column heads of the soil cement columns, and steel pipe piles and ready-made steel pipes press-fitted into the plurality of soil cement columns. A trussed pile consisting of a concrete pile or a ready-made concrete pile, and a truss press-fitted into the soil cement wall and connected to the ready-made pile. (2) Create a plurality of soil cement columns in the ground using the soil cement method, and before the soil cement columns harden, press-fit ready-made piles consisting of steel pipe piles, ready-made steel pipe concrete piles, or ready-made concrete piles into the soil cement columns, Create a soil cement wall between each soil cement column before or after press-fitting the ready-made pile, and connect the ready-made pile press-fitted into the soil-cement column and the truss while press-fitting the truss into the soil cement wall before the soil cement wall hardens. Construction method for trussed piles. (3) The connection between the ready-made pile and the truss is achieved by attaching the ready-made pile to the side surface of the ready-made pile and injecting cement mortar into a hollow columnar joint having a gap in the radial direction of the ready-made pile and using a T-shaped joint at the truss part. Implementation method for trussed piles as described in Section.