JPH0559728A - Sheathing work above underground structure - Google Patents

Abstract

PURPOSE:To permit a sheathing wall to be supported by using a timbering work having sufficiently great strength even when the penetration of sheathing piles into the ground deeply is impossible due to the presence of a structure under the ground. CONSTITUTION:Excavation for deep foundation is made until an underground structure 15 is reached, and sheathing piles 19 are set into the vertical pit so formed, and the lower end of the piles 19 is fixed to the structure 15. A shore strut 9 is provided to the piles 19 so fixed to form a timbering work 17 to support the sheathing wall 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mountain retaining method for preventing collapse of earth and sand when excavating the ground for constructing a building.

[0002]

2. Description of the Related Art When constructing a building such as a building,
With the increase in the height and scale of buildings, it is becoming more necessary to excavate the ground before building the basement, as the number of layers of basement is increased.

Excavation is also required when constructing an underground structure such as an underground shopping mall. In such excavation, a retaining wall is provided to prevent the surrounding sediment from collapsing, and a supporting structure is provided to support the retaining wall with beams and columns.

There are various mountain retaining methods for constructing such retaining walls and supporting works, depending on various conditions such as the size of a building and the condition of the ground. For example, FIG. 5 is a perspective view of a general supporting work made by a conventional earth retaining method as seen from the inside. The horizontal sheet pile 3 that constitutes the retaining wall 1 is supported by the main pile 5 made of H-shaped steel,
The transverse sheet pile 3 and the main pile 5 are supported by the cross beam 9 via the abdomen 7 so as not to bend inside.
This girder 9 is provided between two soil retaining walls 1 that are relatively piled, and the force to be supported by the jack 11 or the like is adjusted,
It is supported by the support pile 13.

A part or all of the support pile 13 and the parent pile 5 may be previously driven deep into the ground as a retaining pile. In this way, when it is necessary to excavate the ground deeply such as in a high-rise building, it is necessary to drive the pillars that constitute the support work, that is, the earth retaining piles into the ground beforehand and then excavate the ground. For example, boring is performed first, and concrete is placed in the vertical hole formed by boring to form a deep foundation, and at the same time, a retaining pile is erected. Then, while digging the ground, the earth retaining wall is applied to the inner wall of the excavated ground, and beams are attached to the earth retaining pile to support the earth retaining. While supporting this, the ground is further excavated deeper.

Incidentally, it is also possible to drive the earth retaining pile further deeply without forming the deep foundation to replace it. However, when a concrete structure or the like is already provided underground in the metropolitan area or urban areas, it may not be possible to perform boring for forming a deep foundation, or it may be impossible to drive the retaining pile deep.
In such a case, since the supporting work is not provided sufficiently, the force to support the retaining wall becomes weak and the risk of collapse of the sediment increases, so a chemical solution for solidifying the sediment was injected on a large scale. ..

Further, since the retaining pile cannot be driven deeply, the number of retaining piles is increased and the strength of the entire support work is increased. Furthermore, when the existing structure exists in a sufficiently shallow place, the existing structure is cut around or modified so that the mountain can be retained as much as possible.

[0008]

However, large-scale chemical solution injection, an increase in the number of retaining piles, cutting and remodeling of existing structures lead to high cost of mountain retaining, and moreover, existing underground structures. In the area where things are congested, these conventional Yamatome construction methods are extremely expensive and time consuming.

The present invention has been made in order to solve the above problems, and it is possible to easily make a mountain detention even in an area having an existing underground structure, which can save construction cost and time. The purpose is to provide a mountain retaining method above the object.

[0010]

[Means for Solving the Problems] In order to achieve the above object, the present invention comprises a step of excavating a deep foundation until reaching an existing underground structure, and a step of setting up a retaining pile in a vertical hole for excavating a deep foundation, A step of cementing the lower end of the soil retaining pile to the existing structure,
A mountain retaining method, which comprises a step of supporting a retaining wall by providing a cutting beam for the consolidated retaining pile.

Further, the cutting beams are provided in a plurality of stages as the ground excavation proceeds deeply, and a connecting member for connecting the cutting beams to each other is installed in an inclined state between the cutting beams to form a truss structure for the entire supporting work. It can also be strengthened.

[0012]

[Operation] By strengthening the soil retaining piles by utilizing the strength of the existing structure, it is possible to make a supporting structure having a sufficiently large strength and reliably support the soil retaining wall.

Further, when the entire supporting work has a truss structure, it can be made stronger.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is an overall front view of a support work made by the mountain retaining method of this embodiment, and FIG. 2 shows an enlarged view of the retaining pile in FIG. Further, FIG. 3 shows a main part of FIG. Figure 3
A plan view of is shown in FIG.

In this embodiment, a concrete structure (existing structure 15) is already installed underground in the area where the structure is to be constructed. In order to create the support work 17 for mountain retaining in this area, it is necessary to install the retaining pile 19 in the ground beforehand. For this reason, first, the position where the soil retaining pile 19 is provided is performed, and thereafter, deep foundation excavation is performed by an excavation bucket (for example, a clam-sur-bucket) or the like to form the vertical hole 21 and reach the surface of the existing structure 15.

Then, a consolidation work 23 for securing the soil retaining pile 19 is installed. This installation is shown in Figure 3.
And, as shown in FIG. 4, a plurality of thin vertical holes 25 are dug in the concrete surface of the existing structure 15 to form the chemical anchor 2
7 is provided, and this chemical anchor 27 is used for root consolidation 2
Attach with 3.

Then, the retaining pile 19 is erected in the vertical hole 21 formed by the deep foundation excavation. Then, the bottom end of the soil retaining pile 19 is consolidated with respect to the consolidation work 23. The vertical hole 21 is backfilled after being hardened.

After the earth retaining piles 19 are provided in this manner, various methods can be considered as a method of forming the support work 17 based on the earth retaining piles 19. For example, while excavating the ground 29, the cross pile 3 for forming the earth retaining wall 1 is provided to the earth retaining pile 19. Further, in order to prevent the retaining wall 1 from being bent inward, a bellows raising member 7 is provided horizontally.
The abdomen 7 is supported by the beam 9. This girder 9 is provided so as to stretch two earth retaining walls 1 which are staken relative to each other,
Adjust the thrust with a jack in the center. Further, the cross beam 9 is supported by a support pile 13 or the like. This support pile 13
May be the soil retaining pile according to the present embodiment, or may be a simple intermediate pile without root consolidation. The cutting beams 9 are provided in a plurality of stages as the ground is deeply excavated, and the connecting members 31 (the same material as the cutting beams 9) provided in an inclined state between the plurality of stages of the cutting beams 9. It is also possible to form a truss structure in which the entire supporting structure 17 has a strong structure.

Regarding the existing underground structure 15 used for making the support work in this way, the strength is confirmed or other necessary conditions are investigated. According to the above-mentioned embodiment, although the soil retaining pile 19 cannot be driven sufficiently deep into the ground, it is hardened to the concrete structure (existing structure 15) already provided. The originally-supported shoring 17 has a sufficiently large strength.

Further, since the retaining pile 19 is simply stopped by the concrete structure as compared with the case where the retaining pile 19 is driven deep into the ground, the retaining pile 19 is easily deflected by the lateral load applied by the earth and sand. On the other hand, since the truss structure increases the strength of the supporting structure 17 and supports the supporting structure 17, the stability of the entire supporting structure can be increased. Thereby, the soil retaining wall 1 can be stably supported.

Thus, like in the metropolitan area and urban areas,
Even in the area where the existing structure 15 is congested underground, the supporting structure 17 having sufficient strength can be formed, and therefore large-scale underground excavation becomes possible.

[0022]

As described above, according to the earth retaining method above the existing underground structure of the present invention, the earth retaining pile is solidified by utilizing the existing underground structure, and the supporting work of sufficiently large strength is performed. Since it can be installed and can support the retaining wall, it cannot support the retaining wall as in the past, so it is not necessary to inject a large-scale chemical solution to harden the soil in the ground, and the number of retaining piles can be increased. This eliminates the need for cutting and remodeling the existing structure, thus saving the cost and time and making the mountain stay.

[Brief description of drawings]

FIG. 1 is a front view of a support work by a mountain retaining method according to an embodiment of the present invention.

FIG. 2 is an enlarged view of the soil retaining pile of FIG.

FIG. 3 is an enlarged view showing the lower end of the retaining pile in FIG.

4 is a horizontal sectional view of FIG.

FIG. 5 is a perspective view of a conventional shoring method, which is seen from the inside.

[Explanation of symbols]

 1 Soil retaining wall 3 Horizontal sheet pile 5 Parent pile 7 Raised belly 9 Girder 13 Support pile 15 Existing structure 17 Support work 19 Soil retaining pile 21 Vertical hole 23 Consolidation work

Claims (2)

[Claims] 1. In the mountain retaining method in an area having an existing underground structure, a step of excavating a deep foundation until reaching the existing underground structure, a step of setting up a retaining pile in a vertical hole for excavating the deep foundation, and a soil retaining method. A mountain retaining method comprising a step of consolidating a lower end of a pile to an existing structure and a step of supporting a retaining wall by providing a cutting beam for the consolidated retaining pile. 2. A truss structure for the entire supporting work by providing the cutting beams in a plurality of stages as the ground excavation proceeds deeper and installing a connecting member connecting the cutting beams in an inclined state between the cutting beams. The Yamadome method of claim 1.