JP2966287B2 - Construction method of steel tube column wall - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a column wall by sequentially laying a large number of steel pipe piles underground.

[0002]

2. Description of the Related Art As a method of constructing this type of column wall,
Conventionally, a method described in JP-A-03-228913 is known. This method involves drilling a hole of the required depth with an earth auger drill of an excavator and injecting cement milk to form a hole filled with soil cement, in which a male side for interconnection is provided. A steel pipe having a connecting strip and a female connecting strip on both sides is erected, and the connecting strip of the earth auger drill is fitted to the connecting strip of the buried steel pipe which has been completely installed, so that the buried steel pipe can be used as a new guide. forming a hole for filling the Soi Rusemento drilled holes, a new steel pipe, the coupling strip is intended to repeat the work of Tatekomu by fitting the binding conditions of the embedded steel pipe.

However, in the above-mentioned conventional method, a new hole is excavated by fitting a joint of an earth auger drill of an excavator into a joint of a buried steel pipe and using the joint of the buried steel pipe as a guide. The joints of the buried steel pipe are not only easily damaged or deformed due to the impact of excavated rubble, etc. However, there is a problem that the connecting strip is twisted or broken due to excessive force, which hinders the excavation of a hole and also hinders the installation of a new steel pipe.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to excavate a new hole without damaging a joint of an existing steel pipe pile, and to reliably insert a new steel pipe. To provide a method of constructing steel
And there .

[0005]

In order to solve the above-mentioned problems, a first method of the present invention is to excavate a hole of a required depth by an excavator and inject cement milk to fill the soil cement. Forming a soil cement pit, and laying a steel pipe pile provided on the side with a connecting strip for interconnection in the soil cement pit, and substantially the same as the steel pipe pile on the outer surface of the completed steel pipe pile. the coercive <br/> protection member having a length, a binding strip which is provided on the protective member is engaged with the binding conditions of the steel pipe pile Rutotomoni, ribs of the steel pipe pile provided in the protective member
It is installed by being inserted into the soil cement mine in a state of being in contact with the outer side surface, and subsequently, a new hole is excavated by an excavator using the protection member as a guide to form a soil cement mine, and the protection member is formed. Then, a new steel pipe pile is built in the soil cement mine by engaging one of the connecting strips on the side with the connecting strip of the existing steel pipe pile, and the following steps after the installation of the protective member will be described. It is characterized by repeating the required number of times.

A second method of the present invention is to form a soil cement pit filled with soil cement by digging a hole of a required depth with an excavator and injecting cement milk. In a pit, a steel pipe pile with a connecting strip on the side for interconnection is almost the same as the steel pipe pile
A protection member having a length is fitted to the connection member of the steel pipe pile so as to be engaged with the connection member provided on the protection member ;
After the rib provided on the protection member is built in contact with the outer surface of the steel pipe pile, a new hole is excavated by an excavator using the protection member as a guide to form a soil cement pit,
Pull out the protection member, into the soil cement mine,
A new steel pipe pile in which one joint is covered with a protective member is erected by engaging the other joint with a joint of an existing steel pipe pile, and a new hole is excavated using the protective member as a guide. The subsequent steps are repeated a required number of times. In the present invention, it is also possible to simultaneously drill a plurality of holes using a multi-axis excavator.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The method of the present invention will be described below in more detail with reference to the drawings. In the present invention, first,
As shown in FIG. 1A, a leader mast 2 of an excavator 1
Attach an earth auger drill 3 with a drilling diameter about 400 mm larger than the diameter of the steel pipe pile to control the vertical accuracy,
With this earth auger drill 3, a hole 4a having a required depth is drilled at a position where the reference steel pipe pile is to be built.

As shown in FIGS. 1 (B) and 1 (C), the earth auger drill 3 is lifted up while the cement milk 6 is injected from the tip of the earth auger drill 3 into the hole 4a, so that the excavated soil is removed. A soil cement well 4A filled with the mixed soil cement 5 is formed. Next, after moving the excavator 1, FIGS. 1 (D) and 1 (E)
As shown in (1), a reference steel pipe pile 7 is erected at a required position in the soil cement pit 4A.

As shown in FIG. 2, the steel pipe pile 7 extends over substantially the entire length on both left and right sides thereof, and has a male connecting strip 8 and a female connecting strip 9 for connecting adjacent steel pipe piles to each other. The connecting strips 8 and 9 are located on the center line L of the steel pipe column wall, and the male connecting strips 8 and 9 are provided in the same direction.
With each steel pipe pile 7 facing the side where the next steel pipe pile is to be built.
To be built.

The shape of the male and female connecting strips 8 and 9 is as follows.
There are various types other than those having a rectangular cross section as shown in FIG.
FIG. 7 shows some typical examples. That is, the one shown in FIG.
(B) is composed of a male connecting strip 8 having a T-shaped cross section and a female connecting strip 9 having a C-shaped cross section. As shown in FIG. 3C, the male and female connecting strips 8 and 9 each have a C-shaped cross section.

Subsequently, as shown in FIGS. 3 and 4, a protection member 10 is provided on the outer side surface of the male connecting strip 8 in the steel pipe pile 7 which has been completely built. The protection member 10 has a function of covering the joint strip 8 of the existing steel pipe pile 7 and protecting the joint strip 8 from rubble generated when drilling a new hole, and a function of protecting the earth auger drill 3 when drilling a new hole. And a guide curved surface having a protective curved surface 11 for enclosing the connecting streak 8 therein and having a radius of curvature substantially equal to the radius of excavation of the earth auger drill 3. The protective curved surface 11 has a female coupling 13 that can be engaged with the male coupling 8 of the steel pipe pile 7, and a plurality of ribs 14 that contact the outer surface of the steel pipe pile 7. Are formed in the axial direction, and the length of the protection member 10 is formed to be substantially the same as the length of the steel pipe pile 7. The protective member 10 Thus, by inserting into the soil cement pit 4A in a state of engaging the female coupling conditions 13 to the male side coupling conditions 8 of the steel pipe pile 7, is to be set in the steel pipe pile 7 You.

When the protection member 10 is completely installed, a new hole 4b is excavated by the excavator 1 at a position adjacent to the existing steel pipe pile 7 as shown in FIG. The drilling of the new hole 4b is performed by positioning the earth auger drill 3 along the curved guide surface 12 of the protective member 10 and digging down the protective member 10 to a predetermined depth as a guide. The excavation can be performed stably by the guide, and the excavation accuracy is also improved. Further, not only the male joint strip 8 is protected from rubble and the like generated during excavation, but also the male joint strip 8 due to the acting force, which is common in the conventional method of excavating using the male joint strip 8 as a guide. There is no problem such as torsion or breakage, and therefore, when the new steel pipe pile 7 is erected, the engagement between the connecting strips 8 and 9 is reliably and smoothly performed.

After drilling the hole 4b having a predetermined depth, the soil auger drill 3 is pulled up while pouring cement milk into the hole from the tip of the earth auger drill 3 in the same manner as described above. A filled soil cement well 4B is formed.

Next, the protective member 10 provided on the existing steel pipe pile 7 is pulled out, and as shown in FIG. 6, a new steel pipe pile 7 is replaced with the female side connecting strip 9 on the side thereof. Pile 7
In the state of being engaged with the male connecting strip 8
Build by inserting into B.

Again, the step of providing the protective member 10 covering the male joint strip 8 on the outer surface of the steel pipe pile 7 that has been erected, the step of excavating a new hole and forming a soil cement pit, By repeating the process of extracting the member 10 and the process of setting up a new steel pipe pile 7 a required number of times, the desired steel pipe column wall is constructed.

In the above method, the protection member 10 is provided after the steel pipe pile 7 is erected, but the protection member 10 is provided in advance on one side surface of the steel pipe pile 7 before being erected. In that state, the steel pipe pile may be built,
Accordingly, since the work of installing the protection member 10 can be performed in advance or in parallel with the excavation of the hole, the number of steps is reduced and the work is simplified.

Further, in the above description, the case where one hole is excavated one by one with a single-shaft excavator having one earth auger drill 3 has been described. However, as shown in FIGS. A plurality of holes can be drilled at the same time using a multi-axis excavator having a plurality of earth auger drills 3, thereby enabling a plurality of steel pipe piles 7 to be laid at the same time. The construction period can be shortened.
In this case, the adjacent earth auger drills are rotated in opposite directions. However, if the adjacent earth auger drills are in a positional relationship such that they do not contact each other, they can be rotated in the same direction. When a plurality of holes are excavated at the same time, it goes without saying that the protection member 10 is provided on the steel pipe pile 7 that has been erected at the most distal end.

[0018]

As described above, according to the present invention, the connecting joint on the outer surface of the previously built steel pipe pile is covered with the protective member, and a new hole is excavated by the excavator using the protective member as a guide. After that, the protective member was pulled out, and the new steel pipe pile was joined to the existing steel pipe pile and built, so that a new hole could be excavated without damaging the joint of the existing steel pipe pile. Therefore, a new steel pipe can be reliably installed.

[Brief description of the drawings]

1 (A) to 1 (E) are cross-sectional views showing steps of a method according to the present invention until a reference steel pipe pile is erected.

FIG. 2 is an enlarged cross-sectional plan view in a state where a steel pipe pile is erected.

FIG. 3 is a side sectional view showing a state where a protection member is provided on a steel pipe pile.

FIG. 4 is an enlarged cross-sectional plan view of FIG.

FIG. 5 is a cross-sectional plan view showing a pattern of excavating a hole adjacent to an existing steel pipe pile.

FIG. 6 is a cross-sectional plan view showing a state where a new steel pipe pile is built by being connected to an existing steel pipe pile.

FIGS. 7A to 7C are cross-sectional plan views showing various shapes of a joint.

FIGS. 8A to 8D are main part side views showing an example of a multi-axis excavator having a plurality of earth auger drills.

[Description of sign]

DESCRIPTION OF SYMBOLS 1 Excavator 4a, 4b Hole 4A, 4B Soil cement pit 5 Soil cement 6 Cement milk 7 Steel pipe pile 8 Male side connecting line 9, 13 Female side connecting line

Claims (3)

(57) [Claims] An excavator drills a hole of a required depth and injects cement milk to form a soil cement pit filled with soil cement, and a connection for interconnection in the soil cement pit. like an anchor a steel pipe pile with a strip on the sides, on the outer surface of the steel pipe pile like an anchor has been completed, the
A protective member having substantially the same length as the steel pipe pile, engaging the binding strip which is provided on the protective member in the binding conditions of the steel pipe pile Rutotomoni,
It is installed by inserting the rib provided on the protection member into the soil cement mine in a state where it is in contact with the outer surface of the steel pipe pile ,
Subsequently, a new hole is excavated by an excavator using the protection member as a guide to form a soil cement pit, and the protection member is pulled out. By engaging a connecting strip of an existing steel pipe pile, and thereafter repeating the steps after the installation of the protective member a required number of times. 2. A soil cement pit filled with soil cement is formed by drilling a hole of a required depth by an excavator and injecting cement milk, and a connection for interconnection is formed in the soil cement pit. a steel pipe pile with the side surface of the strip, and a protective member having substantially the same length as the steel pipe pile, the locked state of the binding strip which is provided on the protective member in the binding conditions of the steel pipe pile
At the same time, the rib provided on the protection member is
It is built in a state of being in contact with the outer side surface, and after excavating a new hole with an excavator using the protective member as a guide to form a soil cement mine, pulling out the protective member, into the soil cement mine, A new steel pipe pile with the connecting strip covered with a protective member is installed by engaging the other connecting strip with the connecting strip of the existing steel pipe pile. A method for constructing a steel tube column wall, wherein the step of repeating is repeated a required number of times. 3. The method according to claim 1, wherein a plurality of holes are excavated simultaneously using a multi-axis excavator.