JPH05140939A - Sheathing method in large depth excavation - Google Patents

Abstract

PURPOSE:To provide possibility of constructing a large depth sheathing wall and also constructing an inclined sheathing wall, and widen the scope of application. CONSTITUTION:A sheathing wall to be constructed is divided vertically into a plurality of elements 14, each of which is executed individually in the depth direction in such a sequence as excavation of a pit 1, execution of element 14, excavation of the ground inside of the element, and fixation of element 14 by a lock bolt 15 while the ends of the upper and lower elements 14, 14 are overlapped, and thereby the whole sheathing wall is constructed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth retaining method for deep excavation.

[0002]

2. Description of the Related Art Generally, earth retaining works are used for the purpose of preventing collapse of the excavated earth and sand when constructing an underground structure. Conventionally, earth retaining works have been used as earth retaining works of this type. A sheet pile construction method using steel sheet piles or horizontal sheet piles for partitioning to block the is known and is most commonly practiced.

[0003]

However, this sheet pile construction method requires a large amount of support materials because the sheet piles need to be supported by the support constructions composed of a lot of angulations and beams. There is a problem that a lot of manpower is required for assembling the work and the construction is likely to be complicated.

Further, since the length of the main pile for standing up the steel sheet pile and the horizontal sheet pile is limited, the depth of the earth retaining wall that can be constructed is naturally limited, and the deep underground structure There was a problem that it could not be applied to the construction of objects. Furthermore, since only vertical earth retaining walls can be constructed, and sloped earth retaining walls cannot be constructed, it cannot be applied, for example, to the lining of slopes that face roads in mountainous areas. It was something that was

The present invention has been proposed in order to solve the above-mentioned conventional problems, and enables construction of a deep soil retaining wall, and not only construction of a vertical soil retaining wall but also sloped soil retaining wall. It is an object of the present invention to provide a soil retaining method for large-scale excavation that enables wall construction and has many applications.

[0006]

According to the deep soil retaining method of the present invention, an earth retaining wall to be constructed is vertically divided into a plurality of elements, and each divided element is excavated with a vertical hole to construct the element. In this order, excavation of the ground inside the element, and fixing with the lock bolt of the element,
The above-mentioned object is achieved by constructing the whole earth retaining wall by constructing the earth retaining walls individually by constructing them in the depth direction while overlapping the ends of the upper and lower earth retaining walls.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The deep soil retaining method according to the present invention will be described below in order with reference to FIGS.

(1) First, the vertical hole 1 is excavated in the ground in the shape of a groove having a constant width (see FIG. 1). Although the vertical hole 1 varies depending on the shape of the underground structure, the vertical hole 1 is continuously excavated in the horizontal direction while maintaining a predetermined depth, and is continuous in a circular or rectangular annular shape (see FIGS. 11 and 12). Further, the vertical hole 1 is constructed by excavating the vertical hole 1 slightly inward so that the elements 14 described later are constructed in substantially the same vertical plane (see FIG. 10).

For excavating the vertical hole 1, a chain saw excavator as shown in FIGS. 14 and 15, as well as a disc cutter, a hydraulic excavator, a clam shell or the like, which can continuously excavate the vertical hole 1 in a groove shape. Shall be used.

(2) Subsequently, the reinforcing bar 2 is inserted into the vertical hole 1 and fixed to the central portion of the vertical hole 1 (see FIG. 2). As the reinforcing bar 2, for example, one having a large rigidity such as a lattice reinforcing bar or a lath wire net, or one having a relatively small rigidity such as a wire net is used.

The reinforcing bar 2 has a high rigidity, for example,
When using lattice reinforcing bars, either the edges of adjacent lattice reinforcing bars should be wrapped (see Figures 16 and 17), or the male joint 3 and steel pipe made of T-shaped steel etc. that engage with each other at the edges should be used. The lattice joints are already connected by the method of jointing the reinforcing rods in the underground continuous wall construction, such as by providing the female joint 4 (Figs. 18 and 19). In either case, the lattice reinforcing bars are covered with concrete as described later. Attach the spacer 5 so that the thickness is sufficiently secured (see Fig. 22).

When a reinforcing bar 2 having a relatively small rigidity, for example, a wire net is used, H is placed in the vertical hole 1.
The struts 6 made of shaped steel or the like are built at predetermined intervals and tightly connected to the struts 6 to support them (see FIG. 20).

A mold release material 7 such as asphalt roofing is inserted inside the reinforcing bar 2 together with the reinforcing bar 2 (see FIG. 22). This release material 7 is for eliminating the adhesion between the concrete to be placed later and the soil inside it, and for facilitating the excavation work of the ground.

(3) Subsequently, concrete 8 is placed in the vertical hole 1 and cured until sufficient strength is exhibited (Fig. 2
reference).

When the concrete 8 is poured all over the vertical hole 1 at a time, it is poured continuously while being careful not to separate it by the concrete pump 9 (see FIG. 23).

When partitioning into a plurality of parts and placing them, the reinforcing bar 2 is fixed to the center of the vertical hole 1 from both sides by the tubular packer 10 and the reaction force receiver 11, and the vertical hole 1 is divided into a plurality of parts. Compartment, 8 concrete for each compartment
(See Figures 24, 25 and 26).

The packer 10 and the reaction force receiver 11 are set in advance on the reinforcing bar 2 and set up in the vertical hole 1 together with the reinforcing bar 2, and the packer 10 is filled with concrete 8 therein. To expand (Figs. 25, 26
See).

As a method for partitioning the vertical hole 1, there is also a method in which a locking pipe 12 having a diameter substantially the same as the lateral width of the vertical hole 1 is set up at the connecting portion of the reinforcing bar 2 (see FIG. 21).

In this case, in order to fix the reinforcing bar 2 in the vertical hole 1, a connecting bar 13 is provided on the side of the locking pipe 12, and the end of the reinforcing bar 2 is tightly bound or wrapped with the connecting bar 13. To do.

When fiber concrete is used as the concrete 8, the reinforcing bar 2 can be omitted.

(4) Subsequently, when the concrete 8 exhibits sufficient strength, the inside of the concrete 8, that is, the inside of the concrete wall 14 (hereinafter simply referred to as "element 14") is excavated (see FIG. 3). .. A conventionally used excavator is used for excavation.

(5) Subsequently, when the element 14 can be excavated to the extent that it can withstand the earth pressure behind it, the excavation is temporarily stopped,
A plurality of lock bolts 15 are installed in the surrounding ground from the front side of the element 14 to the back side thereof to firmly fix the upper end of the element 14 to the surrounding ground (see FIG. 4). And
Again, excavation of the ground is started, and the lower end of the element 14 is also fixed by the lock bolt 15.

(6) When the construction of the lock bolt 15 is completed,
The vertical hole 1 is excavated again along the inner surface of the element 14 just installed. The excavation of the vertical hole 1 is performed in exactly the same way as in (1) (see Figures 14 and 15).

(7) Subsequently, the reinforcing bar 2 is set up in the vertical hole 1 in the same manner as in the case of (2), and the release material 7 is placed inside it.
Insert.

(8) Subsequently, the vertical hole 1 is filled with concrete 8 by the same method as in the case of (3), and is sufficiently cured.

(9) Subsequently, the inside of the concrete 8, that is, the element 14 is excavated by the same method as in the case of (4).

(10) Subsequently, the element 14 is fixed to the surrounding ground by the same method as in (5).

In the same manner, the steps (1) to (5) are repeated in the same manner to sequentially construct the third and fourth elements 14 in the depth direction, thereby constructing the whole earth retaining wall. (See Figures 6-10). In such a case, the upper and lower elements 14,1
The upper and lower elements 14 and 14 are made continuous by overlapping the ends of 4 by a predetermined length.

Incidentally, the construction of the element 14 does not necessarily have to be performed by cast-in-place concrete, but may be performed by precast concrete.

FIG. 13 shows a construction method of a sloped earth retaining wall, which can be applied to a slope lining facing a road in a mountainous area, for example.

27 to 30 show that the upper and lower elements 14 are not fixed individually but are fixed together by the same lock bolt 15 so that the construction of the lock bolt can be shortened. ..

[0032]

Since the present invention is constructed as described above, it has the following effects.

The earth retaining wall is not constructed over the entire length from the beginning, but is divided into a plurality of elements in the depth direction, and each divided element is sequentially constructed in the depth direction to form the entire earth retaining wall. Due to the construction, the vertical holes for building each element can be relatively shallow and need not be deep. Therefore, the excavator can be a small one that is easy to handle, and since it is possible to proceed with the work while checking each construction status such as the vertical hole drilling status and the concrete driving status, safe construction and reliable construction are possible. Is.

Further, by adding a required number of elements in the depth direction, it is possible to construct an earth retaining wall of an arbitrary depth, and it is possible to sufficiently cope with the construction of deep underground structures.

Further, not only the vertical earth retaining wall but also the inclined earth retaining wall can be constructed (see FIG. 13).
It can also be applied to slope lining of roads in mountainous areas and has a very wide range of applications.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of the ground showing a method of excavating a vertical hole by a Cheng Saw excavator.

FIG. 2 is a sectional view of the ground showing a concrete pouring method.

FIG. 3 is a sectional view of the ground showing a method of excavating the ground.

FIG. 4 is a sectional view of the ground showing a method of constructing a rock bolt.

FIG. 5 is a cross-sectional view of the ground showing a method of excavating a vertical hole.

FIG. 6 is a sectional view of the ground showing an element under construction.

FIG. 7 is a cross-sectional view of the ground showing an element under construction.

FIG. 8 is a cross-sectional view of the ground showing a method of constructing a lock bolt.

FIG. 9 is a cross-sectional view of the ground showing an element under construction.

FIG. 10 is a cross-sectional view of the ground showing an element under construction.

FIG. 11 is a perspective view showing a part of the earth retaining wall which is circularly constructed and is being constructed.

FIG. 12 is a perspective view showing a part of the earth retaining wall during construction.

FIG. 13 is a sectional view of the ground showing a part of the sloped earth retaining wall during construction.

FIG. 14 is a perspective view showing a method of excavating a vertical hole by a Cheng Saw excavator.

FIG. 15 is a perspective view showing a method of excavating a vertical hole by using a chainsaw excavator.

FIG. 16 is a front view of a reinforcing bar showing a reinforcing bar arrangement method.

FIG. 17 is a plan view of a reinforcing bar showing a reinforcing bar arrangement method.

FIG. 18 is a front view of a reinforcing bar showing a reinforcing bar arrangement method.

FIG. 19 is a plan view of a reinforcing bar showing a reinforcing bar arrangement method.

FIG. 20 is a partial perspective view of a reinforcing bar showing a reinforcing bar arrangement method.

FIG. 21 is a partial perspective view of a reinforcing bar showing a reinforcing bar arrangement method.

FIG. 22 is a partial perspective view of an earth retaining wall showing a reinforcing bar arrangement method.

FIG. 23 is a partial perspective view of an earth retaining wall showing a concrete pouring method using a concrete pump.

FIG. 24 is a partial plan view of a vertical hole showing a method for placing split concrete.

FIG. 25 is a partial plan view of a vertical hole showing a method for placing split concrete.

FIG. 26 is a partial plan view of a vertical hole showing a method for placing split concrete.

FIG. 27 is a perspective view showing a method of excavating a vertical hole by a Cheng Saw excavator.

FIG. 28 is a partial perspective view of an earth retaining wall showing a reinforcing bar arrangement method.

FIG. 29 is a partial perspective view of an earth retaining wall showing a concrete pouring method using a concrete pump.

FIG. 30 is a partial perspective view of an earth retaining wall showing a method of constructing a lock bolt.

[Explanation of symbols]

1 ... Vertical hole, 2 ... Reinforcing bar, 3 ... Male joint, 4 ... Female joint, 5 ...
Spacer, 6 ... Strut, 7 ... Mold release material, 8 ... Concrete, 9 ... Concrete pump, 10 ... Packer, 11 ... Reaction force receiving, 12 ... Rocking pipe, 13 ... Connecting bar, 14 ... Concrete wall (element), 15 … Rock bolt.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Tadashi Yoshikawa 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd.

Claims (1)

[Claims] 1. An earth retaining wall to be constructed is vertically divided into a plurality of elements, and each of the divided elements is used for excavation of a vertical hole, construction of an element, excavation of an element inner ground, and fixation of the element with a lock bolt. In order,
A soil retaining method for large depth excavation, characterized by constructing the entire soil retaining wall by stacking the ends of the upper and lower soil retaining walls and constructing them individually in the depth direction.