JPS5814524B2 - Pillar row pile construction method combined with drainage drain - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a column-row pile-stopping construction method that uses a drainage drain, that is, a column-row pile-stopping method in which a row of pile-stopping columns are consecutively connected via a drainage drain.

The purpose of this invention is to allow groundwater on the ground side to seep out naturally to the root cutting side through drainage drains in conjunction with excavation and drainage on the root cutting side, thereby reducing the groundwater pressure on the ground side that is applied to the pile retaining column row. Furthermore, it is an object of the present invention to provide an improved method for securing pillar rows by using relatively small core materials and strut supports for the pillar rows.

BACKGROUND ART Conventionally, when constructing a basement floor structure of a building, the pillar-row pile construction method has been widely practiced because of its ease of excavation, low noise, and relatively low cost.

However, the conventional pillar row pile locking method, for example,
As typified by the invention described in Publication No. 36112, it is constructed in such a way that the column rows have perfect water-stopping properties, and the column rows receive all of the earth pressure and water pressure during root cutting, and the strut supports are used. ing.

Naturally, the core material of the columns and the strut supports are required to have a large cross-sectional strength sufficient to withstand the loads of earth pressure and water pressure.

For example, in the case of a structure with about two stories underground, safety can be ensured by using 300-inch H-beam supports as support beams, but if the structure is deeper than four stories underground, the influence of groundwater pressure increases rapidly. It is difficult to ensure safety with the above-mentioned 300 mm H-shaped beam support, and this has become a problem because larger H-shaped steel must be used to ensure safety.

In other words, if a strut support larger than the commonly used 300 mm H-shaped steel is used, it will not only be difficult to procure such materials and increase costs considerably, but also require a large strut support. Naturally, this method has the disadvantage that it occupies a large proportion of the space occupied by the root cutting space, which increases the space constraints when constructing the basement floor structure of a building, and causes various inconveniences.

This invention was made for the purpose of solving the above-mentioned drawbacks and problems of the prior art, and the ultimate purpose of this invention is to form a column stopper row and In the column direction of the stopper columns, column defects that do not form a column are provided at required intervals, and in the column defects, perforated tubes are used as the core material and gravel with good water permeability is provided. Drainage piles with a filler material such as Drain Pile are slightly offset towards the ground side, overlap with the adjacent row of columns, and reach the ground surface from a predetermined depth in the ground like the other rows of columns. We provide a column-row pile stop construction method that uses a drainage drain, which is characterized by the fact that groundwater on the ground side is allowed to seep out to the root cutting side through a drainage drain in conjunction with excavation and drainage on the root cutting side. It is to be.

Next, the present invention will be explained with reference to illustrated embodiments.

FIG. 1 shows, in plan, an example of the construction method of the pillar row pile stop construction method using a drainage drain according to the present invention.

In the figure, 1 is a dog-diameter soil pile with a reinforcing core that forms a row of columns, and 2 is the same small-diameter soil pile without core that forms a row of columns.
3 shows a drainage pile having a water-permeable structure.

Further, in the figure, 4 refers to the root cutting side, and 5 refers to the ground side.

Arrow a indicates the flow line of groundwater.

In the case of this construction example, the column rows are arranged in an overlapping arrangement by combining piles of different diameters, and the column rows are spaced at the required intervals in the column direction, that is, at intervals appropriate for reducing the hydraulic load due to groundwater drainage. In order to prevent the formation of a small-diameter soil pile 2 between the large-diameter fill piles 1 and 1 at the site, a gap, that is, a column defect point A, is provided, and the column column defect point A is slightly offset toward the ground side 5. The drainage piles 3, 3 are formed in an overlapping arrangement.

Next, the construction procedure for forming the row of retaining pillars shown in FIG. 1 will be explained.

As a first step, small diameter soil piles 2 having a diameter of about 450φ are formed at a pitch of about lm.

However, small diameter fill pile 2 is different from wastewater drain pile 3.
. . ., that is, at intervals of approximately 3 m in the column direction (vertical direction in FIG. 1).

In other words, the small-diameter piles 2... are arranged so that every second one is missing (however, this is not limited to this example.

). As the next step, by dropping the H-shaped steel 6 that is the reinforcing core material, the dog-diameter pile piles 1 with a diameter of about 600φ are made at a pitch of about 1 m so that they overlap slightly between the small-diameter fill piles 2, 2. Then, the column row C where the large and small soil piles 1 and 2 are arranged in parallel is constructed.

The dog-diameter pile pile 1 and the small-diameter soil pile 2 forming the column row C are strongly formed using cement and bentonite as a coagulant and the soil at the current excavation position as an aggregate.

As a next step, the small diameter fill pile 2 is constructed as described above.
The diameter is approximately 450φ at the place where the hole was not formed, that is, at the opening of the column row C, which was provided at the required interval in the row direction of the column row C.
Drainage drain piles 3... are formed so as to be slightly offset to the ground side 5 and overlap the dog-diameter soil piles 1, 1.

The drainage drain pile 3 is formed by using gravel or the like with good water permeability as the filling material, and by inserting a perforated tube (or mesh tube) 7 as a core material to increase the pressure resistance of the drainage drain pile 3. do.

Particularly suitable perforated tubes I are perforated polyethylene tubes sold under the trademark Netronshito.

FIGS. 2A to 2G show construction procedures for forming the wastewater drain pile 3 using the earth auger 10.

To briefly explain this, FIG. 2A shows a step in which the auger screw 13 is driven to rotate by the auger machine 12 moving up and down along the leader 11 to press-fit the casing pipe 14 while drilling, and FIG. 2B shows the step in which the casing pipe 14 is press-fitted while drilling Casing pipe 1
4 is compressed to a predetermined depth, and then the winch 15 is used to pull out the auger screw 13 and remove the soil.

As a result, the casing pipe 14 is left underground, and its hollow part becomes the hole 16 for forming a drainage pile.

FIG. 2C shows the step of inserting the perforated tube 7 into the hole 16, and FIG. 2F shows an enlarged view of section f in FIG. 2C.

The perforated tube 7 is inserted into the hole 16 using the auger machine 12, but at this time, it is necessary to be strong enough to withstand the resistance of the muddy water filling the hole 16. As the open tube 7, it is preferable to use the netron sheet described above.

FIG. 2D shows seven stages in which the casing pipe 14 is pulled out after the gravel 11 as a filling material is poured in densely, and FIG. 2G shows an enlarged view of section g in FIG. 2D.

The perforated tube 1 is buried in the gravel 11 at the stage of introducing the gravel 17, and is arranged concentrically with the hole 16.

Incidentally, if the ground is stable, the casing pipe 14 may be pulled out immediately after inserting the perforated tube 7, and then the gravel 17 is introduced, but if the ground is unstable, the perforated tube 7 may be pulled out. After inserting the tube 7 and injecting the bentonite liquid for stabilizing the hole wall, the casing pipe 14 is pulled out, and then the gravel 17 is introduced.

FIG. 2E shows the completed formation of the wastewater drain pile 3.

As described above, and according to the present invention, (a) A pillar row defect that forms a column stopper column and is spaced at a required interval in the column direction of the column stopper column row, and does not form a column column; (b) A perforated tube is used as a core material in the missing part of the column row,
The drainage pile, which is filled with highly permeable sand or the like, is slightly offset to the ground side and wraps with the adjacent row of columns, and like the other rows of columns, it is installed from a predetermined depth in the ground to the surface of the ground. (c) Groundwater on the ground side is made to seep out to the root cutting side through the drainage drain in conjunction with the excavation and drainage on the root cutting side. Since the gist of this method is the mountain-stop method, it achieves the following effects.

■ It can be easily and inexpensively constructed in the same way as the conventional pillar-row pile construction method.

■ Drainage drain piles 3, 3, etc. in the missing areas of the pillar row work in an integral relationship with other pillar rows (large-diameter, small-diameter soil piles 1, 2) and work together to prevent piles. There is no problem with the action and effect.

■ As the excavation and drainage on the root cutting side 4 progresses, the groundwater in the ground side 5 passes through each of the permeable drainage drain piles 3, 3... as shown by flow a and flows to the root cutting side 4. It naturally oozes out.

■ Therefore, the groundwater level in the ground side 5 is lowered, and the groundwater pressure applied to the pile pillar row can be reduced to almost zero, and the pile pillar row only needs to absorb the earth pressure. Become.

■ Therefore, the safety of the row of retaining columns is increased, and the cross section of the H-shaped steel 6, which is the reinforcing core material of the large-diameter fill panel 1, and the strut support can be made relatively small, which makes the construction easier. You can enjoy top and economical benefits, such as the space convenience of underground floor construction and the effect of saving pile-up costs.

This is especially effective in Wago where the roots are deep and the groundwater pressure load is high.

Furthermore, since the drainage pile 3 allows only groundwater to pass through and prevents water from flowing out from behind, it has excellent stability on the ground side, and can prevent unexpected accidents such as road collapse and house tilting.

■ In addition, the groundwater seeping out to the root cutting side 4 is collected in a water channel and drained away by a drainage pump.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a part of a column column when the column pile stopper method according to the present invention is implemented, Fig. 2 A to E are process diagrams showing the procedure for constructing a drainage drain pile, and Fig. 2 F is Figure 2C
FIG. 2G is an enlarged view of section g in FIG. 2D. 1...Dog diameter soil pile, 2...Small diameter soil pile, 3...Drainage drain pile, A, mouth...column missing spot, C...column column.

Claims (1)

[Scope of Claims] 1 (a) Forming a row of pillars with a retaining pillar, and providing pillar row defects that do not form a row of pillars at a required interval in the row direction of the row of retaining pillars, ) A perforated tube is used as a core material in the missing part of the column row,
The drainage pile is made of highly permeable gravel, etc., and is slightly offset to the ground side and wraps with the adjacent pillar row, and is installed from a predetermined depth in the ground to the ground surface in the same way as the pond pillar row. (c) Groundwater on the ground side is made to seep out to the root cutting side through drainage drains in conjunction with excavation and drainage on the root cutting side. Stop method.