JP4150521B2 - Construction method of earth retaining wall - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for constructing a retaining wall using a self-propelled press-fitting machine.
[0002]
[Prior art]
As the retaining wall such as a road retaining wall, a concrete retaining wall represented by an L-shaped retaining wall has been mainstream.
However, it is difficult to install ordinary concrete retaining walls in places where construction conditions are severe, such as proximity construction, current traffic, and effects on the surrounding environment. In such cases, steel pipe sheet piles, steel sheet piles, box-type sheet piles, H-type sheet piles, etc. The earth retaining wall has a structure in which the sheet piles and underground continuous walls are self-supporting.
[0003]
[Problems to be solved by the invention]
The above conventional techniques have the following problems.
First, when a ground anchor is used for a retaining wall with a high wall height in a place where the construction conditions are severe, a temporary scaffold for installing a boring machine for drilling is required continuously, resulting in a long construction period. At the same time, the construction cost also increases.
Secondly, in places where the construction conditions are severe, such as proximity construction, current traffic, and the influence on the surrounding environment, there is no installation place for the temporary scaffolding itself, and construction of the retaining wall itself has been impossible.
The present invention is made in view of the above problems, and provides a method for constructing a retaining wall that enables construction under severe construction conditions, such as no provision of a temporary scaffolding, and can reduce the construction period and construction cost. The purpose is to do.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention of claim 1 takes a reaction force from an existing pile or a sheet pile (for example, sheet pile 2 etc.) and newly creates a pile or sheet pile (for example, sheet pile, for example) as shown in FIGS. 2) and press on the existing pile or sheet pile (for example, sheet pile 2) and press the new pile or sheet pile sequentially into a position adjacent to the existing pile or sheet pile (for example, sheet pile 2). The construction method of the earth retaining wall 50 using the self-propelled press-fitting construction machine 1 capable of changing the press-fitting angle of a new pile or sheet pile,
The self-propelled press-fitting construction machine 1 is a chuck that press-fits a new pile or sheet pile (for example, sheet pile 2) by detachably grasping and lifting the new pile or sheet pile (for example, sheet pile 2) to be press-fitted. Part 8 and an inclined mast part 5 that can be turned to change the raising and lowering direction of the chuck part 8, and
A new pile or sheet pile (for example, sheet pile 2) is applied to the existing pile while taking a reaction force from the existing pile or sheet pile (for example, sheet pile 2) for the sheet pile wall 2a to be the retaining wall 50 by the self-propelled press-fitting construction machine 1. Or build by pressing along the sheet pile ,
And the slant pile 3 which suppresses the displacement of the sheet pile wall 2a while taking the reaction force from the existing pile or the sheet pile (for example, the sheet pile 2) by the self-propelled press fitting construction machine 1 is obliquely press-fitted into the sheet pile wall 2a. In addition, the slant pile 3 and the sheet pile wall 2a are joined.
[0005]
According to the construction method of the retaining wall of the invention of claim 1, by using the self-propelled press-fitting construction machine 1, a new pile or sheet pile 2 can be obtained while taking a reaction force from the existing pile or sheet pile 2 with the sheet pile wall 2a. The slant pile 3 that press-fits and suppresses the displacement of the sheet pile wall 2a while taking a reaction force from the existing pile or the sheet pile 2 is obliquely press-fitted to the sheet pile wall 2a, and the slant pile 3 and the sheet pile wall 2a are joined. Thus, the earth retaining wall 50 can be constructed. Thereby, while building the sheet pile wall 2a, the earth retaining wall 50 which can suppress the displacement of the sheet pile wall 2a by the diagonal pile 3 can be built efficiently. That is, by combining the sheet pile 2 constituting the retaining wall 50 and the slant pile 3 that reinforces the retaining wall 50, the required space of the machine can be suppressed, and the temporary scaffolding is installed. Even in a narrow space where there is no earthwork, it is possible to shorten the construction period and reduce the construction cost for constructing the retaining wall 50 provided with the ground anchor (slope pile 3).
[0006]
The invention of claim 2 is, for example, as shown in FIGS. 3 and 4, in the construction method of the earth retaining wall according to claim 1, the construction of the sheet pile wall 2 a is performed by the self-propelled press-fitting construction machine 1. After the press-fitting of the plurality of sheet piles 2, the slant piles 3 are press-fitted obliquely at intervals by repeating the press-fitting of the slant piles 3 obliquely.
[0007]
According to the invention of claim 2, during the construction of the sheet pile wall 2a, after the plurality of sheet piles 2 are press-fitted by the self-propelled press-fitting construction machine 1, by repeatedly pressing the slant pile 3 obliquely, The press-fitting of the sheet pile 2 and the work of press-fitting the plurality of slant piles 3 at intervals can be continuously performed. Since the self-propelled press-fitting construction machine 1 has a characteristic that it is difficult to move backward, if the machine that separates the sheet pile 2 and the oblique pile 3 and constructs it, in order to press-fit the oblique pile 3 after the construction of the sheet pile wall 2a, If a machine is arranged again, or a plurality of machines are required, a plurality of sheet piles 2 and a plurality of slant piles 3 are press-fitted obliquely with the same machine. The earth retaining wall 50 can be efficiently constructed with the traveling press-fitting construction machine 1.
[0008]
The invention of claim 3 is, for example, as shown in FIG. 4, in the method for constructing a retaining wall according to claim 1 or 2, the slant pile 3 is provided with a rotary press-fitting provided with a spiral screw 3 a at least at the tip. A pile (for example, rotary press-fit steel pipe pile 31) is used, and the rotary press-fit pile (for example, rotary press-fit steel pipe pile 31) is press-fitted while rotating.
[0009]
According to the invention of claim 3, the slant pile is the rotary press-fit pile 31 provided with the spiral screw 3a at least at the tip, and the rotary press-fit pile 31 is press-fitted while rotating, so that depending on the direction of the screw 3a The rotary press-fit pile 31 can be smoothly press-fitted while rotating. Moreover, for example, earth pressure is applied to the sheet pile wall 2a in the horizontal direction (arrow F in FIG. 4), and a force that pulls the slant pile 3 is applied. With respect to such a force, the normal slant pile 3 has only resistance due to friction between the slant pile 3 and the earth and sand, but by using the rotary press pile 31 provided with the screw 3a, the friction between the rotary press pile 31 and the earth and sand. In addition to the resistance caused by the above, a load of earth and sand on the screw 3a is applied. Further, when a force that lifts the earth and sand by the screw 3a acts, in the support layer P, due to the stress against the shearing force generated between the earth and sand that the force that is lifted by the screw 3a acts and the surrounding earth and sand. High pulling resistance can be obtained, and it can cope with back soil pressure.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a method for constructing a retaining wall according to the present invention will be described with reference to the drawings. First, the self-propelled press-fitting construction machine 1 used for the construction method of the retaining wall in this Embodiment is demonstrated. FIG. 1 is a diagram showing a main part of a self-propelled press-fitting machine 1 according to the present embodiment, and FIG. 2 (a) is a side view of the self-propelled press-fitting machine 1 shown in FIG. FIG. 2 (b) is a side view of the self-propelled press-fitting construction machine of FIG. The self-propelled press-fitting construction machine 1 detachably grips an existing pile gripping portion 7 that detachably grips a previously pressed sheet pile 2 (pile) and takes a reaction force from the sheet pile 2 and detachably grips a sheet pile 2 to be press-fitted. In addition, it is provided in the chuck portion 8 for press-fitting the sheet pile 2 gripped by lifting and lowering, and the existing pile gripping portions 7,... And the main part is comprised by the mast part 9 provided in the existing pile holding part 7 so that turning was possible so that direction could be changed right and left.
[0011]
The existing pile gripping portion 7 is provided with a slide portion 72 that can freely move back and forth (in the direction of arrow C in FIG. 1) with respect to the existing pile gripping portion 7, and the mast portion 9 is provided on the slide portion 72. The slide unit 72 is pivotably attached so as to change its direction from side to side. Furthermore, the lower part of the existing pile holding part 7 is equipped with clamps 71,... That are fixed to the cylindrical sheet pile 2 (steel pipe sheet pile) previously press-fitted so as to be pushed open from the inside.
[0012]
A swivel seat 6 is provided on the front surface of the mast portion 9, and the inclined mast portion 5 is attached to the swivel seat 6 so as to be turnable so as to be tilted to the left and right. Furthermore, hydraulic cylinders 10 and 10 are attached to both sides of the swivel seat 6 as drive means for driving the tilted mast 5 to pivot with respect to the mast 9 outside the mast 9 and the tilted mast 5.
[0013]
The chuck portion 8 includes a gripping portion 81 that grips the sheet pile 2 or the inclined pile 3, is attached to the front surface of the inclined mast portion 5 so as to be movable up and down, and is driven up and down by a hydraulic cylinder 82 provided on the upper portion of the chuck portion 8. To go up and down.
[0014]
The main difference between the conventional self-propelled press-fitting machine and the self-propelled press-fitting machine of the present embodiment is that a chuck part that can be moved up and down is conventionally attached to the front surface of the mast part. However, the self-propelled press-fitting construction machine 1 according to the present embodiment includes the inclined mast portion 5 between the mast portion 9 and the chuck portion 8 so as to be rotatable with respect to the mast portion 9. Therefore, when the inclined mast portion 5 is inclined, the chuck portion 8 is inclined with respect to the mast portion 9, and the chuck portion 8 can be moved up and down, so that the vertical pile or the sheet pile 2 and the inclined pile 3 are press-fitted. This is a possible point.
[0015]
Next, the construction method of the earth retaining wall in this Embodiment is demonstrated. Using the construction method of the retaining wall in the present embodiment, for example, as shown in FIG. 3, a plurality of sheet piles 2 (stakes) are sequentially press-fitted in an engaged state in the locking portion 20, and this row The slant pile 3 is placed on one surface of a sheet pile wall 2a formed by a plurality of sheet piles 2 arranged in a shape at a predetermined interval from a position adjacent to the upper portion of the sheet pile 2 with respect to the longitudinal direction of the sheet pile 2 Inclining and press-fitting work.
[0016]
When press-fitting the sheet pile 2, the inclined mast portion 5 is in a vertical state, the sheet pile 2 is gripped by the gripping portion 81 as in the conventional state, and the sheet pile 2 is gripped by the hydraulic cylinder 82 of the chuck portion 8. The chuck part 8 is lowered and the sheet pile 2 is press-fitted into the ground.
[0017]
On the other hand, when the inclined pile 3 is press-fitted, the existing sheet piles 2,... Are gripped by the clamps 71, and the hydraulic cylinders 10, 10 are operated in the opposite directions while the chuck portion 8 is raised. As a result, the swivel seat 6 connected to the hydraulic cylinders 10 and 10 swivels, and the tilted mast portion 5 engaged with the swivel seat 6 tilts. Then, the hydraulic cylinder 82 provided in the chuck portion 8 is obliquely lowered in the ground direction, whereby the chuck portion 8 holding the oblique pile 3 is lowered by the grasping portion 81, and the oblique pile 3 is inclined with respect to the sheet pile 2. Pressed into the ground.
[0018]
And after this diagonal pile 3 is press-fit, the existing sheet pile 2 and the diagonal pile 3 are fastened by the coupling member 32, and then the concrete D is poured and hardened to join the diagonal pile 3 and the sheet pile wall 2a. To do.
[0019]
In addition, the self-propelled press-fitting construction machine is known not to have the inclined mast portion 5, but to take a reaction force from the existing pile, press the pile almost vertically, and to self-run on the existing pile. As in this example, the self-propelled press-fitting construction machine 1 is self-propelled.
[0020]
By the way, the gripping portion 81 can be rotationally driven with respect to the chuck portion 8 main body, so that the gripped oblique pile 3 can be press-fitted while being rotated. If it is set as such a structure, as shown in FIG. 4, the rotary press-fit steel pipe pile 31 (rotary press-fit pile) provided with the helical screw 3a at the front-end | tip can be used, for example. If the rotary press-fit steel pipe pile 31 is press-fitted while rotating according to the direction of the screw 3a, the rotary press-fit steel pipe pile 31 can be smoothly press-fitted. In addition, earth pressure is applied to the sheet pile wall 2a in the horizontal direction (in the direction of arrow F in FIG. 4), and a force that pulls the slant pile 3 is applied. With respect to such a force, the normal slant pile 3 has only resistance due to friction between the slant pile 3 and earth and sand, but by using the rotary press-fit steel pipe pile 31 having the screw 3a, the load of earth and sand on the screw 3a is reduced. Take it. Further, when a force that lifts the earth and sand by the screw 3a acts, in the support layer P, due to the stress against the shearing force generated between the earth and sand that the force that is lifted by the screw 3a acts and the surrounding earth and sand, High pulling resistance can be obtained, and it can cope with back soil pressure.
[0021]
According to the construction method of the earth retaining wall in the present embodiment, it is possible to sequentially press-fit new sheet piles 2 at positions adjacent to the existing sheet piles 2 by moving on the sheet piles 2 (existing sheet piles) that have been previously press-fitted. In addition, the slant pile 3 can be press-fitted into at least one of the front part and the rear part of the sheet pile wall 2a formed by the sheet piles 2,... Can be combined. Thereby, while constructing the sheet pile wall 2a, it is possible to efficiently construct the earth retaining wall 50 capable of suppressing the displacement of the sheet pile wall 2a by the oblique pile 3 that is obliquely press-fitted, and the height is high. In addition, the work for constructing the earth retaining wall 50 standing stably can be facilitated. Further, even in a narrow place where there is no temporary scaffolding installation place, it is possible to construct the retaining wall 50 having the ground anchor (slope pile 3), and the construction period can be shortened and the construction cost can be reduced. .
[0022]
Further, since the inclined mast portion 5 is connected to the mast portion 9 via the swivel seat 6 provided on the front surface of the mast portion 9, the turning operation of the inclined mast portion 5 is performed by the mast portion 9 and the existing pile gripper. There is no restriction of the holding part 7. Further, since the hydraulic cylinder 10 is provided outside the mast portion 9, there is no restriction on the size of the hydraulic cylinder 10 by the mast portion 9 and the inclined mast portion 5, and a large driving force can be provided. 5 can be increased, and the inclined state of the inclined mast portion 5 can be maintained.
[0023]
In addition, since the sheet pile 2 and the slant pile 3 are press-fitted and installed in the construction of the retaining wall 50, vibration and noise are suppressed, and the construction space and cost are reduced compared to the construction using the batting method or the digging method. can do.
[0024]
In addition, in the construction method of the earth retaining wall 50 in this Embodiment, after fastening the existing sheet pile 2 and the diagonal pile 3 with the coupling member 32, the sheet pile wall 2a, the diagonal pile 3 and However, the present invention is not limited to this, and the main point is that the sheet pile wall 2a and the oblique pile 3 can be joined together.
[0025]
Moreover, although the slant pile 3 was arrange | positioned on the side pulled out with respect to the earth pressure F from the side, it is not limited to this, For example, you may arrange | position to the side compressed. Furthermore, as a construction procedure, the sheet pile 2 may be continuously press-fitted to complete the sheet pile wall 2a, and then the diagonal pile 3 may be press-fitted.
[0026]
In the construction method of the retaining wall 50 in the present embodiment, the sheet pile 2 is press-fitted in the vertical direction, but a pile may be used as long as the retaining wall can be constructed.
[0027]
【The invention's effect】
According to the earth retaining wall construction method of the present invention, a self-propelled press-fitting construction machine is used to sequentially press-fit piles or sheet piles and to suppress displacement of sheet pile walls while taking reaction force from existing piles or sheet piles. The retaining wall can be easily constructed by pressing the pile diagonally against the sheet pile wall. Moreover, a pile or a sheet pile can be newly press-fitted sequentially in the position adjacent to an existing pile or a sheet pile by moving on an existing pile or a sheet pile. Therefore, since a self-propelled press-fitting construction machine capable of press-fitting a pile or sheet pile constituting the retaining wall and an oblique slant pile (anchor) that reinforces the sheet pile wall and self-propelled is used, Installation is not required. This eliminates the need for installation work for temporary scaffolds, which not only contributes to reductions in work period and cost, but also earth retaining walls equipped with ground anchors (slanted piles) even in narrow spaces where temporary scaffolding is not available. Can be constructed.
[Brief description of the drawings]
FIG. 1 is a front view showing an example of an embodiment of a self-propelled press-fitting construction machine used in a method for constructing a retaining wall according to the present invention.
2 is a side view of the self-propelled press-fitting construction machine shown in FIG. 1, wherein (a) is a side view seen from the direction of arrow A in FIG. 1, and (b) is a side view seen from the direction of arrow B in FIG. FIG.
FIG. 3 is a diagram showing an example in which a pile or sheet pile constituting a sheet pile wall and an oblique pile that suppresses displacement of the sheet pile wall are press-fitted using the construction method of the retaining wall according to the present invention; ) Is a plan view thereof, and (b) is a side view thereof.
FIG. 4 shows an example in which a pile or sheet pile constituting a sheet pile wall and a rotary press-fit steel pipe pile as a slant pile that suppresses displacement of the sheet pile wall are press-fitted using the retaining wall construction method according to the present invention. (A) is the top view, (b) is the side view.
[Explanation of symbols]
1 Self-propelled press-fitting machine 2 Sheet pile (pile)
3 inclined pile 3a screw 2a sheet pile wall 31 rotary press-fit steel pipe pile (rotary press-fit pile)
50 retaining wall

Claims (3)

Take the reaction force from the existing pile or sheet pile and press-fit a new pile or sheet pile, move the existing pile or sheet pile and press the pile or sheet pile sequentially into the position adjacent to the existing pile or sheet pile A construction method for retaining walls using a self-propelled press-fitting machine that can change the press-fit angle of a new pile or sheet pile,
The self-propelled press-fitting construction machine detachably grasps a new pile or sheet pile to be press-fitted and moves up and down to change the ascending / descending direction of the chuck portion to press-fit the new pile or sheet pile. And an inclined mast part that can be swiveled,
Constructed by press-fitting a new pile or sheet pile along the existing pile or sheet pile while taking a reaction force from the existing pile or sheet pile as a retaining wall by the self-propelled press-fitting construction machine,
And the diagonal pile which suppresses the displacement of the sheet pile wall while taking the reaction force from the existing pile or the sheet pile by the self-propelled press fitting construction machine is obliquely press-fitted with respect to the sheet pile wall, and the diagonal pile and the sheet pile wall A method for constructing a retaining wall, characterized by joining the two. During the construction of the sheet pile wall, after the plurality of sheet piles are press-fitted by the self-propelled press-fitting construction machine, the slant piles are obliquely press-fitted and repeated to form a plurality of slant piles at an interval. The method for constructing a retaining wall according to claim 1, wherein the retaining wall is press-fitted into a wall. The method for constructing a retaining wall according to claim 1 or 2, wherein the oblique pile is a rotary press-fit pile having a spiral screw at least at a tip end portion, and the rotary press-fit pile is press-fitted while rotating.

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