JPH0360972B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a construction method for retaining mountains so as not to affect the adjacent land and structures when a structure such as a building is being rebuilt, It is characterized by being constructed with underground obstacles (underground obstacles) left as they are.

[Conventional technology]

Recently, in urban areas, for effective land use,
Buildings and other structures are built close together.

Therefore, when rebuilding the above structures, it is necessary to ensure that the adjacent land and structures are not affected.

In other words, the rebuilding of the above structures naturally begins with the removal of the old structures. First, above-ground structures are destroyed and removed, and then underground structures are removed.

However, when underground structures are removed, adjacent land and structures must be protected. In other words, it must be done so that the adjacent land does not collapse.

Conventionally, a temporary pile was constructed by driving sheet piles or H-steel continuously on the outside of an underground structure, and the temporary pile was supported by hypotenuse beams or shoring to prevent it from falling inward. A method has been adopted in which the inner underground structure is destroyed and removed, the necessary mountain retainers are constructed in the removed portion, and then the temporary mountain retainers are removed.

[Problem that the invention seeks to solve]

In the above-mentioned conventional method, sheet piles or H-steel etc. are continuously driven into the outside of the underground structure to form a temporary mountain retainer, and measures must be taken to prevent them from falling inward. After the underground structures have been destroyed and removed, the required retaining structure must be removed, which requires time and effort and is extremely uneconomical.

The present invention eliminates the above drawbacks,
The present invention aims to provide an economical mountain retaining construction method that does not require the construction of a temporary mountain retainer and, therefore, does not require removal work.

[Means for trying to solve problems]

The present invention solves the above problems by:
After the above-ground structure is removed, the underground structure is left as it is, and a pile is constructed by drilling a hole using a drilling machine capable of destroying the underground structure, placing soil pillars, and connecting them.

[Effect]

Underground structures themselves protect adjacent land and buildings.

In other words, while the underground structure remains, the adjacent land will not collapse.

Therefore, the underground structure itself to be removed has the function of retaining the mountain.

Previously, the underground structure in that area was removed prior to constructing the mountain retainer. Therefore, temporary mountain retainers were required, and their construction and removal required time and effort.

In the present invention, the mountain retainer is first constructed while leaving the underground structure as it is.

That is, drilling is performed by a drilling machine that has the ability to destroy underground structures, and furthermore, soil pillars are placed and their connections are performed.

The above-mentioned soil pillars are placed and connected by placing the soil pillars at appropriate intervals according to the pile installation line in advance, and successively overlapping the soil pillars in between to connect them. It is made to be a wall.

In other words, when drilling holes at appropriate intervals and placing soil pillars, the underground structure that remains acts as a heap retainer, and does not affect the adjacent land and structures, and the underground structure cannot be removed after the heap retainer is completed. is removed.

〔Example〕

The construction method of the present invention is shown in FIGS. 1a to 1h.

In the figure, Y indicates an underground structure (underground obstacle), which is not removed at the time of constructing a pile in the present invention.

In addition, numeral 1 in the figure is a drilling machine capable of destroying the above-mentioned underground structure Y. Although not shown in the figure, an auger head screw and an auger head are provided in the casing 1a, and solids such as cement milk are ejected from the tip of the auger head. The casing 1a, the auger head screw, and the auger head are configured to be able to eject the binder in reverse directions.

The casing 1a, the head screw, and the auger head are made of high-tensile steel plates, and the cutting edge is coated with strong wear-resistant hardfacing to ensure good rotation and biting.

In the present invention, first, as shown in FIG. 1a, a ruler 2 made of H steel is installed at a position for forming a heap, and at the same time a working ground for horizontally supporting the drilling machine 1 is constructed.

Then, the casing 1a is installed vertically.
Next, excavation is performed while discharging the injection liquid from the tip of the auger head (Fig. 1b).

They are the first regardless of the existence of underground structure Y.
As shown in Figure c, the hole is drilled to a predetermined depth.

Next, the injected liquid and soil are stirred by repeatedly moving the auger up and down (Figure 1d).

Furthermore, the auger is pulled up in a forward rotation while continuing to discharge the injection liquid (Fig. 1e).

Thereafter, the auger portion is removed from the drilling machine 1, the H steel 3 as a stress material is suspended, and the H steel 3 is erected by its own weight (FIG. 1f).

Specifically, they are guided by a guide jig 4 for erecting the H-steel 3 provided using the ruler 2, and the H-steel 3 is erected at the point indicated on the ruler 2 in advance.

The H steel 3 is then fixed in place (Fig. 1g).

Specifically, they are fixed by bolts or the like (not shown) provided on the side of the erection guide jig 4 of the H steel 3.

Then, the soil pillar 5 is completed by solidifying the soil cement (Fig. 1h).

In the present invention, a row of pillars serving as a mountain retainer is constructed by repeating the above steps.

As shown in Figure 2, this is done by placing soil pillars at appropriate intervals, waiting for the soil to solidify, and then sequentially overlapping the soil pillars and connecting them.

That is, Fig. 2 shows the case of a single-shaft auger, but the first time (A in the same figure), the soil pillars 5a are constructed with three spacings apart, and the second time (B in the same figure), the soil pillars 5a are constructed with three pillars apart. A soil pillar 5b is constructed in the center of the 3rd (C) and 4th (D)
Soil pillars 5c and 5d are constructed between soil pillars 5a and 5b, forming a row of pillars that serve as a mount.

FIG. 3 shows the column arrangement order in the case of a two-shaft auger.

In other words, when configuring a two-shaft auger to increase work efficiency, the spacing must be set in advance so that one soil column can fit between them, and the first time (see figure A)
The soil pillars 5e are constructed with intervals between the main parts, and the second
For the second time (FIG. B), a soil pillar 5f is constructed in the center of the five pillars.

As a result, soil columns 5e and 5b are formed at one spacing.

Then, for the third time (C) in the same figure and the fourth time (D) in the same figure, soil pillars 5g and 5h are constructed between the soil pillars 5e and 5f, and a row of pillars serving as a crest is constructed.

Thereafter, the earth and sand and underground structure Y inside the pile are removed, and as the earth and sand and underground structure Y are removed, shoring etc. are installed inside. After that, new construction will begin.

〔Effect of the invention〕

According to the present invention, there is no need to remove the underground structure prior to configuring the heap retainer, and therefore there is no need to construct a temporary retainer as in the past. This will give you the desired effect.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIGS. 1A to 1H are process diagrams thereof, and FIGS. 2 and 3 are explanatory diagrams showing the order of soil column casting. 1...Drilling machine, 5a-5h...Soil column, Y...
...underground construction.

Claims (1)

[Claims] 1. A soil pouring pile retaining construction method, which is characterized in that after removing an above-ground structure, the underground structure is left as it is, and a pile is constructed by drilling a hole using a drilling machine capable of destroying the underground structure, placing a soil pillar, and connecting the columns.