JP2935634B2 - Steel pipe sheet pile wall construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel sheet pile wall construction method used in the field of civil engineering, and more particularly to a steel sheet pile wall construction method suitable for an earth retaining structure.

[0002]

2. Description of the Related Art As is well known, earth retaining works are works for minimizing deformation and settlement of the ground during excavation.
In recent years, with the demand for effective utilization of underground space, etc., it has become necessary to develop a construction method of a retaining wall corresponding to various site conditions.

[0003] Retaining walls are roughly classified into cast sheet walls, underground continuous walls, column-type underground continuous walls, stable liquid-solidified walls, prefabricated steel walls, and the like. Among the walls, the steel pipe sheet pile wall is a retaining wall suitable for large-scale excavation in soft ground or the like, and is often used recently for construction in a bay area.

In order to construct a steel sheet pile wall, it is common to drive the steel sheet pile with a diesel hammer, bipro hammer or drop hammer while checking the verticality of the steel pipe sheet pile. In order to clear the noise, a soundproof cover is attached to the diesel hammer, and the use of a water jet is used to reduce vibration and noise.

However, in the vicinity of the city, the regulation of vibration or noise is very strict, so that at present it is almost impossible to construct by the driving method.

On the other hand, in order to avoid the above-mentioned problem of noise, a method of erection of a steel pipe sheet pile in a hole excavated in advance is conceivable. In this case, however, the water stoppage at the joint between the steel pipe sheet piles is reduced. This creates another problem.

[0007]

In view of such circumstances, the same applicant as the present application has developed a new steel pipe sheet pile wall construction method having both quietness and water stoppage. While attaching a predetermined sheet to the steel pipe sheet pile so as to surround the connecting portion of the steel pipe sheet pile, while excavating a hole for embedding the steel pipe sheet pile in the ground, simultaneously with the excavation, the hole was previously built. The sheet of the adjacent steel pipe sheet pile is broken, and the filler inside the sheet is taken out to expose the inside of the connecting portion of the adjacent steel pipe sheet pile. Next, the steel pipe sheet pile is built into the hole while the connection part of the steel pipe sheet pile is fitted into the connection part of the adjacent steel pipe sheet pile. Next, a predetermined filler is filled into the inside of the sheet, and a predetermined hardening material is injected into a space between a connecting portion of the adjacent steel pipe sheet piles and a connecting portion of the steel pipe sheet piles and around the steel pipe sheet piles.

However, when a bentonite stabilizer is used to prevent the collapse of the pore wall, even if an attempt is made to insert a filler inside the sheet, the sheet can be connected exactly by the hydrostatic pressure of the bentonite stabilizer. In some cases, the filler was clogged on the way, and the workability was sometimes reduced.

Further, when the mortar is injected in a state where the filler is clogged on the way, the mortar infiltrates into the connecting portion, and as a result, the mortar hardened in the connecting portion obstructs,
There is also a problem that hindrance to the later construction work may occur.

The present invention has been made in view of the above-mentioned circumstances, and has both a quietness and a water-stopping property, and has a workability of a steel pipe sheet pile wall improved in workability in a filling step and a subsequent erection step. The purpose is to provide.

[0011]

In order to achieve the above object, a steel pipe sheet pile wall construction method according to the present invention is provided on a steel pipe sheet pile so as to be opposite to each other.
A predetermined sheet is attached to the steel pipe sheet pile so as to surround one of the two connection parts, and a hole for embedding the steel pipe sheet pile is excavated while pouring a predetermined non-hardening type stable liquid. At the same time as the excavation process, one of the adjacent steel pipe sheet piles
Tearing the sheet attached to the joint to collapse the filler inside the sheet to expose the inside of the joint of the adjacent steel pipe sheet pile; and one of the joints of the adjacent steel pipe sheet pile. Embedding the steel pipe sheet pile in the hole while fitting the other connection part of the steel pipe sheet pile into the hole, and surrounding the one connection part of the steel pipe sheet pile with the non-hardening type stabilizing liquid .
A step of filling a predetermined filling material inside of the sheet while flowing down on the inner side of the sheet attached to the earthenware pots, another one of the steel pipe sheet pile and the one connecting part of the adjacent steel sheet pile
Injecting a predetermined hardening material into the space between the two connecting portions and around the steel pipe sheet pile, and replacing the non-hardening type stable liquid with the hardening material.

[0012]

In the steel sheet pile wall construction method of the present invention, first, a predetermined sheet is attached to the steel pipe sheet pile so as to surround one connecting portion of the steel pipe sheet pile to be built.

On the other hand, apart from such an attaching step, a hole for erection of a steel pipe sheet pile with a sheet attached is excavated while a non-hardening type stabilizing liquid such as a bentonite stabilizing liquid is injected into the hole.

In the excavation step, at the same time as the excavation, the sheet of the adjacent steel pipe sheet pile built in advance is torn off, the filler inside the sheet collapses, and the inside of the connecting portion of the adjacent steel pipe sheet pile is exposed. Keep it.

Next, while fitting the other connecting portion of the steel pipe sheet pile to be Komimo built now to one junction of the adjacent steel sheet pile, Tatekomu the steel pipe sheet pile into the hole.

Next, while allowing the non-hardening type stable liquid to flow down inside the sheet attached to the completed steel pipe sheet pile,
A predetermined filler is filled inside the sheet.

Next, a predetermined hardening material is injected into the space formed between the connecting portions of the two steel pipe sheet piles and around the steel pipe sheet piles, and the non-hardening type stable liquid is replaced with the hardening material, and the hardened material is removed. Let it cure.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the steel sheet pile construction method of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a flowchart showing the procedure of the steel pipe sheet pile wall construction method according to this embodiment.

A steel pipe sheet pile 1 used in such a method is shown in FIG.
As shown in (a), a connecting portion 3 and a connecting portion 4 are provided on a steel pipe main body 2 having an outer diameter of, for example, 1.5 m and a length of about 50 m,
Each is a long member along the longitudinal axis of the steel pipe main body 2.

A connecting portion 3 as the other connecting portion and one
The connecting portion 4 of the coupling portion, is provided with on opposite sides of the longitudinal axis of the steel pipe body 2, the connecting portion 3, Yes and juxtaposed towards the pair of angle 5 tip outwardly, The connecting portion 4 is arranged side by side with a pair of angles 6 facing each other.

In such a steel pipe sheet pile 1, the adjacent steel pipe sheet piles 1 are connected to each other by locking the angle 5 of the connecting part 3 of the steel pipe sheet pile 1 adjacent to the connection part 4 of one steel pipe sheet pile 1. It can be connected to.

FIG. 2 (b) shows a state in which steel pipe sheet piles 1a and 1b having the same structure as steel pipe sheet pile 1 are connected to each other.

Next, the procedure of the steel sheet pile wall construction method of this embodiment will be described with reference to the flowchart of FIG.

In this embodiment, for the sake of convenience of explanation, the steel pipe sheet piles 1b, 1c,... Are sequentially built adjacent to the already built steel pipe sheet pile 1a.
, 1b, 1c... Have the same structure as the steel pipe sheet pile 1 described in FIG. 2, and the same portions as the steel pipe sheet pile 1 are denoted by a, b, c,.・ It is to be expressed by adding.

As can be seen from FIG. 1, in the steel pipe sheet pile construction method of the present embodiment, first, the sheet 11b is surrounded so as to surround the connecting part 4b as one connecting part of the steel pipe sheet pile 1b to be built. Attach to the steel pipe sheet pile 1b (step 101).

FIG. 3 shows a state in which a sheet 11b is attached to a steel pipe sheet pile 1b.

As can be seen from the figure, the sheet 11b has
Lobes 12b are provided on both sides of the sheet 11b to reinforce the sheet 11b. The sheet 11b is attached to the steel pipe sheet pile 1b by placing a holding plate 13b in front of the rope 12b and driving a stud 14b into the angle 6b. In this state, a longitudinal hollow space is formed inside the sheet 11b.

On the other hand, apart from the above-mentioned sheet mounting step, a hole 21b for excavating the steel pipe sheet pile 1b to which the sheet 11b is mounted is excavated (FIG. 1, step 102).

FIG. 4 shows an excavation line of the hole 21b by a broken line.

In excavation, a stable solution of bentonite, a stable solution of polymer, or the like as a non-hardening type stabilizing solution is injected into the hole to prevent the hole wall from collapsing. In addition, excavation is performed using, for example, an earth drill, and drilling is performed by rotating a drilling bucket attached to the tip of the kelly bar.

The excavation line (broken line) for the hole 21b is
As can be seen from the fact that it extends to the hardened material 23a filled around the steel pipe sheet pile 1a built in advance, in this step, the ground is excavated and a part of the hardened material 23a is also cut off.

Similarly, as can be seen from the fact that the excavation line of the hole 21b extends to the sheet 11a of the steel pipe sheet pile 1a and the filler 22a filled in the internal space of the sheet 11a, in this step, the ground is removed. At the same time as excavation, tear off the sheet 11a with a drilling bucket or the like to remove the sheet 11a.
a The inner filling material 22a is collapsed to expose the inside of the connecting portion 4a of the steel pipe sheet pile 1a (FIG. 1, step 103).

FIG. 5 shows a state in which a hole 21b has been formed after the excavation step.

As can be seen from the figure, it can be seen that the sheet 11a is torn and the filler 22a inside collapses, and the inside of the connecting portion 4a is exposed to the bentonite stabilizer 31b.

Next, the connecting portion 4a of the adjacent steel pipe sheet pile 1a
Other connection of steel pipe sheet pile 1b to be built
While inserting the connecting part 3b as a part, the steel pipe sheet pile 1b
Is built in the hole 21b (FIG. 1, step 104).

FIG. 6 shows a state at the time when the construction of the steel pipe sheet pile 1b has been completed.

As can be seen from this figure, in this state, the sheet 11b is pressed against the connecting portion 4b of the steel sheet pile 1b by the hydrostatic pressure of the bentonite stabilizing solution 31b.

Next, the bentonite stabilizer was applied to sheet 11b.
The filling material 22b is filled while flowing down inside the step (step 105).

In flowing down the bentonite stabilizer, it is preferable to adjust the flow rate and the like of the sheet 11b so that the hydrostatic pressure inside the sheet 11b becomes larger than the hydrostatic pressure outside the sheet 11b and the sheet 11b swells outward.

The bentonite stabilizing liquid 31b filled around the steel pipe sheet pile 1b is circulated through a sediment separator, a thickening tank, a decanter, a sand settling tank, etc., not shown, and is adjusted to a predetermined concentration. The bentonite solution which is poured into the inside of the sheet 11b may be branched from this circulation system, or the bentonite stable liquid 31b sucked up from the hole 21b may be used as the sheet 11b.
You may make it spout inside.

FIG. 7 shows a state in which the bentonite stabilizing liquid 32b flows down inside the sheet 11b and the sheet 11b is developed outside.

During the filling of the filler 22b, the flow of the bentonite stabilizing solution 32b is continuously performed, and the sheet 11b
Is always deployed outward.

As the filler 22b, a material having a specific gravity higher than the specific gravity of the bentonite solution (usually in the range of 1.0 to 1.3), for example, crushed stone, blast furnace slag (specific gravity of about 2.5), or the like is preferably used. Materials such as iron, magnetite, iron sand and limonite (specific gravity 2.4 to 8
Is more preferred.

FIG. 8 shows a state at the time when the filling of the filler is completed.

Next, bentonite mortar 23b is injected into the space formed between the connecting part 4a of the steel pipe sheet pile 1a and the connecting part 3b of the steel pipe sheet pile 1b and around the steel pipe sheet pile 1b, and the bentonite stabilizing liquid 31b is poured into the bentonite mortar. 23b (step 106).

FIG. 9 shows a state after the bentonite stabilizing solution 31b has been replaced with bentonite mortar 23b. In the figure, reference numerals 41, 42, and 43 indicate piping positions for injecting bentonite mortar.

As can be seen from the piping position, care is taken so that the steel pipe sheet pile 1b does not tilt due to the mortar injection pressure.

Thus, a series of processes relating to the steel pipe sheet pile 1b is completed. However, when the steel pipe sheet pile 1c is to be erected continuously, as in step 101, one of the steel pipe sheet piles 1c is formed .
The sheet 11c is attached to the steel pipe sheet pile 1c so as to surround the connection part 4c as a connection part.
The hole 21c for excavating the hole is excavated. Then, as in step 103, at the same time as excavating the ground, the sheet 11b is torn by a drilling bucket or the like to collapse the filler 22b inside the sheet 11b, and the connecting portion 4b of the steel pipe sheet pile 1b is crushed.
To expose the inside of

FIG. 10 shows a state after excavation of the hole 21c.

Hereinafter, although detailed description is omitted, the steps 104 to 106 may be sequentially repeated as described above.

Thus, by repeating steps 101 to 106 of FIG. 1 as necessary to build a plurality of steel pipe sheet piles, a steel pipe sheet pile wall having a desired length, for example, several hundred meters can be constructed.

After the steel sheet pile wall was constructed, the area surrounded by the steel sheet pile wall was excavated while providing bellows, cutting beams and the like as appropriate.
Build a given structure. After constructing the structure, the work such as backfilling is performed, and if necessary, the constructed steel sheet pile wall is removed.

The conventional steel pipe sheet pile wall method has advantages and disadvantages in that the noise and vibration are severe when performed by the driving method, and the water stopping performance is reduced when the method is performed by the built-in method. In the construction method, as described above, a predetermined sheet is attached to one connection portion of the steel pipe sheet pile in advance, and a filler is filled therein, thereby preventing mortar from entering the connection portion. After the mortar has hardened, the filler is removed and the
Since the other connecting portion is fitted, mortar or the like does not adhere to the vicinity of the connecting portion so that the fitting of the connecting portions is not hindered. Can be easily built.

As described above, since there is almost no friction or resistance at the time of building, no noise or vibration is generated, and the construction method is extremely quiet.

[0056] After that built up the following steel sheet pile, prior to filling the mortar into the gap occurring between one of the connecting portion and the other connecting <br/> formation of the next steel sheet pile of steel sheet pile As a result, it is possible to remarkably improve the water stoppage at the connecting portion.

The underground continuous wall method is well known as an earth retaining method excellent in silence and water stoppage. However, if removal is necessary later, the steel pipe sheet pile wall method of this embodiment is the most suitable method. Becomes

Further, in the steel sheet pile wall construction method by the same applicant as the present application, the sheet is pressed against the connecting portion of the steel sheet pile by the hydrostatic pressure of the bentonite stabilizing solution filled in the hole. Even if it was inserted, it sometimes clogged on the way. As a result, the mortar penetrates into the inside of the connecting portion, and there has been a problem that the steel pipe sheet pile cannot be smoothly installed.However, in the steel pipe sheet pile wall construction method of this embodiment, the filler material is not used. During filling, the bentonite stabilizing solution is injected inside the sheet and the sheet is expanded outside, so the filling material charged from the ground is sequentially filled from the bottom without clogging in the middle I can do it. The downward flow of the bentonite stabilizer also contributes to preventing clogging of the filler.

Thus, the workability of the filling step and the subsequent building step is greatly improved.

Since a filler having a specific gravity larger than the specific gravity of the stabilizer to be injected into the holes is selected as the filler, the filler sinks smoothly into the stabilizer when filling the inside of the sheet, and does not clog in the middle of the sheet. Can be filled inside.

In this embodiment, bentonite mortar is used as the hardening material. However, a material having a predetermined strength and water-blocking property, for example, ordinary mortar or concrete may be used.

Further, in this embodiment, the connecting portion of the steel pipe sheet pile is formed as shown in FIG. 2. However, as long as a space in which mortar can be filled is formed in the connected portion, any shape of connecting portion can be used. Department.

[0063]

As described above, the steel pipe sheet pile wall construction method of the present invention is provided on steel pipe sheet piles so as to be opposite to each other.
A predetermined sheet is attached to the steel pipe sheet pile so as to surround one of the two connection parts, and a hole for installing the steel pipe sheet pile is filled with a predetermined non-curing type stabilizing liquid. The excavation process and one of the adjacent steel pipe sheet piles built earlier at the same time as the excavation process
A step by collapse of the filler of the sheet inside to expose the interior of the connecting portion of the steel pipe sheet piles of the adjacent beating sheet attached to the connecting portion of the adjacent steel sheet pile one
Square a step Tatekomu the steel pipe sheet pile into the hole while fitting the other connecting portion of the steel pipe sheet pile the coupling portion of the, circumference takes one coupling portion of the non-curable stabilizing solution the steel pipe sheet pile
Filling the inside of the sheet with a predetermined filler while flowing down the inside of the sheet attached so that it is between the one connecting portion of the adjacent steel pipe sheet pile and the other connecting portion of the steel pipe sheet pile. A step of injecting a predetermined hardening material into the space and around the steel pipe sheet pile and replacing the non-hardening type stabilizing liquid with the hardening material. In addition, the workability at the time of filling the filler is improved, and the subsequent building process can be performed more smoothly.

[0064]

[Brief description of the drawings]

FIG. 1 is a flowchart showing a procedure of a steel pipe sheet pile wall construction method according to the present embodiment.

2A is a cross-sectional view of a steel pipe sheet pile used in the steel sheet pile wall construction method according to the present embodiment, and FIG. 2B is a view showing a state in which two steel pipe sheet piles are connected.

FIG. 3 is a view showing a state in which a sheet is attached to a connecting portion of a steel pipe sheet pile.

FIG. 4 is a diagram showing a line for excavating a hole for installing a steel pipe sheet pile.

FIG. 5 is a view showing a state in which excavation of a hole for a steel pipe sheet pile has been completed.

FIG. 6 is a view showing a state in which a steel pipe sheet pile is erected in a hole excavated.

FIG. 7 is a diagram showing a state in which a bentonite solution flows down inside a sheet and the sheet is developed outside.

FIG. 8 is a diagram showing a state in which a filler is filled inside a sheet of a piled steel pipe sheet pile.

FIG. 9 is a diagram showing a state in which bentonite mortar is injected into a space formed between a connecting portion between two steel pipe sheet piles and a surrounding portion of the steel pipe sheet pile.

FIG. 10 is a diagram showing a state where another hole is excavated.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Steel sheet pile 3 Connection part (the other connection part) 4 Connection part (one connection part) 11 Sheet 22 Filler 23 Bentonite mortar (hardening material) 31 Bentonite solution (non-hardening type stable liquid) 32 Bentonite solution (non-hardening) Mold stabilizing liquid) 101 Sheet mounting process 102 Excavation process 103 Filler removal process 104 Building process 105 Filler filling process 106 Hardening material injection process

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Jin Kitamura 4-33 Kitahama Higashi, Chuo-ku, Osaka City Inside Obayashi Corporation Osaka Main Store (72) Inventor Hitoshi Nagao 4-33 Kitahama Higashi, Chuo-ku, Osaka City Otsuka Co., Ltd. Inside the Hayashigumi Osaka Main Store (72) Kyouji Ikeda 4-33 Kitahama Higashi, Chuo-ku, Osaka City Inside the Obayashigumi Osaka Main Store (72) Mitsuo Tanigaki 2-2-25 Umeda, Kita-ku, Osaka Goyo Construction Co., Ltd. (72) Inventor Kazuhiro Kimoto 2-2-25 Umeda, Kita-ku, Osaka-shi Goyo Construction Co., Ltd. Inside Osaka Branch (72) Inventor Yasuo Nakata 2-6-1 Higashitenma, Kita-ku, Osaka-shi No. Marugo Basic Industry Co., Ltd. Kansai Branch (56) References JP-A-54-48911 (JP, A) JP-A-5-156625 (JP, A) (58) Fields studied (Int. Cl. ⁶ , (DB name) E02D 5/00-5/20

Claims (1)

(57) [Claims] 1. A steel pipe sheet pile is provided on opposite sides thereof.
A predetermined sheet is attached to the steel pipe sheet pile so as to surround one of the two connection parts, and a hole for embedding the steel pipe sheet pile is filled with a predetermined non-curable stabilizer. Simultaneously excavating, and simultaneously with the excavating step, break the sheet attached to one connecting portion of the adjacent steel pipe sheet pile built in advance to collapse the filler inside the sheet and to reduce the size of the adjacent steel pipe Exposing the inside of the connection portion of the sheet pile; and connecting the steel pipe sheet pile to one connection portion of the adjacent steel pipe sheet pile.
Building the steel pipe sheet pile into the hole while fitting the other connection part; and applying the uncured stabilizing liquid to the one connection part of the steel pipe sheet pile.
Filling the inside of the sheet with a predetermined filler while flowing down the inside of the sheet attached so as to surround it; and connecting one of the connecting portions of the adjacent steel pipe sheet piles to the steel pipe sheet pile.
Injecting a predetermined hardening material into the space between the other connecting portion and the periphery of the steel sheet pile and replacing the non-hardening type stable liquid with the hardening material. Construction method.