JP3754384B2 - Steel pipe sheet pile placing method and guide pile used in this method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a steel pipe sheet pile placing method and a guide pile used in this method. More specifically, the joint portion of the sheet pile is not deformed or damaged during the steel pipe sheet pile placement, and how TECHNICAL FIELD The present invention relates to a steel pipe sheet pile placing method capable of smoothly placing a steel pipe sheet pile even on a ground having a high hardness and a guide pile used in this method.
[0002]
[Prior art]
There are the following methods as a method for placing steel pipe sheet piles that has been used frequently. In this method, a down-the-hole hammer having a bit whose diameter can be enlarged or reduced is used.
First, a down-the-hole hammer whose diameter is reduced is inserted into a steel pipe main body of a steel pipe sheet pile together with a rotating rod connected to the hammer, and the diameter of the bit coming out from the tip of the steel pipe main body is expanded. The down-the-hole hammer is applied to the shoe provided on the inner surface of the lower end of the steel pipe body, and drilling is started with an enlarged diameter bit. After completion of drilling, the bit is reduced in diameter and the down-the-hole hammer and the steel pipe main body are released, and the down-the-hole hammer and the rotating rod are pulled up with the steel pipe sheet pile remaining.
[0003]
However, this method often causes the following problems.
The steel pipe sheet pile is comprised from the steel pipe main body and the joint part provided in the outer surface of this steel pipe main body. Since the conventional placing method described above is a method performed by inserting the down-the-hole hammer only into the steel pipe main body, when the steel pipe sheet pile is placed, the joint portion must advance by pressing its lower end surface against the ground.
In this case, since the joint portion receives a great reaction force from the ground, it may be deformed or damaged, and when the ground is hard, it is difficult to drive the steel pipe sheet pile itself. If deformation or breakage occurs in the joint portion, water or muddy water enters the sheet pile from the portion, and the function as the sheet pile is remarkably impaired.
[0004]
[Problems to be solved by the invention]
The present invention has been made in view of such a situation, and the joint portion of the sheet pile is not deformed or damaged when the steel pipe sheet pile is placed, and for any hardness of the ground. Another object of the present invention is to provide a steel pipe sheet pile placing method capable of smoothly placing a steel pipe sheet pile and a guide pile used in this method.
[0005]
[Means for Solving the Problems]
The invention according to claim 1 includes a guide pile comprising a cylindrical guide pile main body, and a guide pile sub-body provided on the outer surface of the guide pile main body along the longitudinal direction thereof, and a bit capable of expanding and contracting the diameter. Using the down-the-hole hammer for the main body and the down-the-hole hammer for the sub body, the down-the-hole hammer for the main body is inserted into the guide pile main body, and the bit of the down-the-hole hammer for the main body is expanded from the tip of the guide pile main body. And projecting the down-the-hole hammer for the sub body into the guide pile sub-body and causing the bit of the down-the-hole hammer for the sub body to protrude from the tip of the guide pile sub-body in a diameter-expanded state, The hammer is rotatably disposed while pressing the down-the-hole hammer for the main body against a shoe attached to the inner surface, and the lower end of the guide pile sub-body A hole in which the main body of the steel pipe sheet pile is built by starting the drilling with each bit in a state where the hammer is rotatably arranged while pressing the down-the-hole hammer for the sub body against the shoe attached to the surface. After the hole and the sub-hole into which the joint portion of the steel pipe sheet pile is built, the guide pile and each down-the-hole hammer are pulled out from the main hole and the sub-hole, and then the main body of the steel pipe sheet pile in the main hole The joint portion of the steel pipe sheet pile is built in the auxiliary hole, and the auxiliary hole has a diameter capable of installing both joint portions used for the connection of the connected steel pipe sheet piles. This is a method for placing a steel pipe sheet pile.
[0006]
The invention according to claim 2 is a steel pipe sheet pile comprising a cylindrical guide pile main body and a guide pile sub-body provided along the longitudinal direction on the outer surface of the guide pile main body, and comprising a main body and a joint portion. A down-the-hole hammer that guides a down-the-hole hammer for excavating a hole to be built and is pulled out from the drill-hole after completion of the excavation, and the guide-pile main body is a down-the-hole hammer for a main body provided with a bit whose diameter can be increased or decreased The guide pile sub-body is a guide pile for placing a steel sheet pile, wherein a down-the-hole hammer for a sub-body provided with a bit capable of expanding and contracting the diameter can be inserted.
[0007]
The diameter of the guide pile main body is set to be substantially the same as the diameter of the steel pipe sheet pile main body, and the diameter of the guide pile sub-body is substantially the same as the distance between the main bodies of the connected steel pipe sheet piles. The steel pipe sheet pile driving guide pile according to claim 2, wherein the steel pile sheet pile is placed.
By providing these inventions, the above problems can be solved.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
1 and 2 are views showing a method for placing a steel pipe sheet pile according to the present invention.
The steel pipe sheet pile driving method according to the present invention comprises a cylindrical guide pile main body (1) and a guide pile sub-body (2) provided on the outer surface of the guide pile main body (1) along its longitudinal direction. The guide pile (3), the down-the-hole hammer for the main body (4) and the down-the-hole hammer for the sub body (5) are used.
[0009]
As shown in FIG. 3, a steel pipe sheet pile (6) to be placed by the placing method according to the present invention includes a cylindrical sheet pile main body (7) and left and right side surfaces on the outer side of the sheet pile main body (7). It consists of a joint part (8) provided along the longitudinal direction of the main body (7). One of the joint portions (8) is a cylindrical body having a C-shaped cross section. The other joint part (8) may have the same shape as the one joint part (8) (see FIG. 3A), or may be a rod-shaped body having a T-shaped cross section (FIG. 3 ( b)).
This steel pipe sheet pile (6) can be connected to the adjacent steel pipe sheet pile (6) by engaging the joint portions (8) and (8).
Prior to the description of the method for placing the steel pipe sheet pile, the configuration of the guide pile (3) and the down-the-hole hammers (4) and (5) will be described.
[0010]
The guide pile (3) guides the down-the-hole hammer (4) (5) excavating the hole (9) (see FIG. 3 (a)) in which the steel pipe sheet pile (6) is built (placed) in the direction of excavation. After the excavation is completed, the excavation hole (9) is pulled out.
As described above, the guide pile (3) (see FIG. 4) includes a cylindrical guide pile main body (1) and a guide pile sub-unit provided on the outer surface of the guide pile main body (1) along its longitudinal direction. A body (2).
[0011]
The guide pile main body (1) can be inserted with the down-the-hole hammer (4) for the main body provided with the bit (10) capable of expanding and contracting the diameter, and can be lowered as the inserted down-the-hole hammer (4) for the main body is dug. ing.
[0012]
Although the diameter of a guide pile main body (1) is not specifically limited, For example, it forms in the substantially same diameter as the sheet pile main body (7) of a steel pipe sheet pile (6). After the guide pile body (1) and the down-the-hole hammer (4) for the body are pulled out from the ground by forming the guide pile body (1) to be approximately the same diameter as the sheet pile body (7) of the steel pipe sheet pile (6), The sheet pile main body (7) of the steel pipe sheet pile (6) can be reliably built into the main hole (11) of the excavation hole (9) formed by the down-the-hole hammer for the main body (4).
The down-the-hole hammer (4) for the main body is dug in a state where the diameter is larger than the diameter of the guide pile main body (1). Therefore, since a slightly larger diameter excavation portion is formed than the guide pile main body (1), the steel pipe sheet pile (6) is inserted into the main hole (11) of the excavation hole (9) formed by the down-the-hole hammer (4) for the main body. The sheet pile main body (7) can be securely built. This extra excavation part is filled with a stable liquid such as bentonite mud injected from the tip of the down-the-hole hammer (4) for the main body after excavation.
[0013]
The guide pile sub-body (2) is capable of inserting a sub-body down-the-hole hammer (5) having a bit (10) whose diameter can be expanded and contracted, and descends as the sub-body down-the-hole hammer (5) is inserted. It is possible.
[0014]
Although the diameter of a guide pile sub-body (2) is not specifically limited, For example, as shown in FIG. 5, it is set substantially the same as the distance (d) between the main bodies (7) (7) of the connected steel pipe sheet piles. By setting the diameter of the guide pile sub-body (2) to be substantially the same as the distance (d) between the main bodies (7) and (7) of the connected steel pipe sheet piles, the guide pile sub-body (2) and the down-the-hole hammer for the sub-body After pulling out (5) from the ground, the joint part (8) of the steel pipe sheet pile (6) is surely inserted into the subhole (12) of the excavation hole (9) formed by the down-the-hole hammer for subbody (5). Can be cast. Further, the joint portion (8) of the steel pipe sheet pile (6) placed next is also placed in the sub-hole (12), and at this time, the joint portion of these adjacent steel pipe sheet piles (6) (6) ( 8) Can be placed while engaging (8).
[0015]
The down body hole hammer (5) for the sub body is dug in a state where the diameter is larger than the diameter of the guide pile sub body (2). As a result, a slightly larger diameter excavation portion is formed than the guide pile sub-body (2), so that the sub-hole (12) of the excavation hole (9) formed by the sub-body down-the-hole hammer (5) The joint portions (8) and (8) of the adjacent steel pipe sheet piles (6) and (6) are reliably accommodated in the engaged state. This surplus digging portion is filled with a stable liquid such as bentonite mud injected from the tip of the sub body down the hole hammer (5) or the tip of the main body down the hole hammer (4) after excavation.
[0016]
The down-the-hole hammer (4) for the main body is connected to a rotating rod (14) that is rotationally driven by, for example, a rotational driving device (20) illustrated in FIG. 7, and an impact force is applied from the hammer to the rotating rod (14). The excavation is performed by the bit (10) that has obtained the rotational force. This bit (10) changes into a diameter-expanded state and a diameter-reduced state according to the direction of rotation of the rotating rod (14). Normally, when the rotating rod (14) rotates in the forward direction, the diameter increases, and when the rotating rod (14) rotates in the reverse direction, the diameter decreases. As such an expansion / contraction mechanism, for example, a conventionally known form can be used.
In addition, in the example shown in FIG. 7, the rotational drive device (20) for rotationally driving the down-the-hole hammer (4) for the main body is provided in the guide pile main body (1), but the upper outer side of the guide pile main body (1). May be provided.
[0017]
Compressed air for driving the hammer of the down-the-hole hammer (4) for the main body is supplied from the outside through an air supply pipe (15) provided in the rotating rod (14). Stabilizing liquid such as bentonite mud that stabilizes the inner surface of the drilling hole (9) is supplied from the outside to the tip of the down-the-hole hammer (4) for the main body through a stabilizing liquid supply pipe (16) provided in the rotating rod (14). And discharged from the bit (10).
[0018]
The mud (slime) generated by the excavation is a mud mud passage (not shown) provided in the down-the-hole hammer (4) for the main body, and an inner space of the rotating rod (14) communicating with the mud mud passing channel, or a rotating rod ( 14) Ascended between the outer peripheral surface and the inner peripheral surface of the guide pile main body (1) and connected to the slime collecting cap (17) provided at the upper end of the rotating rod (14), and the collecting cap (17). It is discharged outside through the suction hose (18).
[0019]
The sub-body down-the-hole hammer (5) (see FIG. 6) can have the same configuration as the main-body down-the-hole hammer (4). The down-the-hole hammer (5) for the sub body has a smaller bit (10) than the down-the-hole hammer (4) for the main body. Further, the stable liquid supply pipe (16) is not always necessary.
[0020]
Next, a steel pipe sheet pile placing method using the above-described guide pile (3), the main body down-the-hole hammer (4), and the sub-body down-the-hole hammer (5) will be described.
[0021]
First, the down-the-hole hammer (4) for the main body is inserted into the guide pile main body (1), and the bit (10) of the down-the-hole hammer (4) for the main body is protruded in an expanded state from the tip of the guide pile main body (1). . Furthermore, the down-the-hole hammer (5) for the sub body is inserted into the guide pile sub-body (2) and the bit (10) of the down-the-hole hammer (5) for the sub body is expanded from the tip of the guide pile sub-body (2). Make it protrude with.
[0022]
Next, the hammer (4) is rotatably disposed while pressing the down-the-hole hammer (4) for the main body against the ring-shaped shoe (21) (see FIG. 6) attached to the inner surface of the lower end of the guide pile main body (1). In the state where the hammer (5) is rotatably disposed while pressing the down-the-hole hammer (5) for the subsidiary body against the ring-shaped shoe attached to the inner surface of the lower end of the guide pile subsidiary body (2), Start drilling with bit (10).
By this drilling operation, a main hole (11) (see FIG. 3 (a)) in which the sheet pile main body (7) of the steel pipe sheet pile (6) is built, and a joint portion (8) of the steel pipe sheet pile (6) are built. And a sub-hole (12) to be inserted. This hole (11) is made into the diameter which can build in the sheet pile main body (7) of a steel pipe sheet pile (6). The sub-hole (12) has a diameter capable of installing both joint portions (8) and (8) used for the connection of the connected steel pipe sheet piles (6) and (6).
If the stabilizing liquid is injected into the excavation holes (main hole (11) and sub hole (12)) after excavation, the inner surfaces of the main hole (11) and sub hole (12) are stabilized.
[0023]
When the main hole (11) and the sub hole (12) are formed, the guide pile (3) and each down-the-hole hammer (4) (5) are pulled out from the main hole (11) and the sub hole (12).
Thereafter, the sheet pile main body (7) of the steel pipe sheet pile (6) is built in the main hole (11), and the joint portion (8) of the steel pipe sheet pile (6) is built in the sub hole (12). At this time, the steel pipe sheet pile (6) may be lowered by its own weight, or may be lowered by using a vibrator.
[0024]
Once the steel pipe sheet pile (6) has been installed, drilling is performed in the same manner as described above, and after excavation holes (main hole (11) and sub hole (12)) are formed, the steel pipe sheet pile is formed in the same manner as described above. Build (6). At this time, the steel pipe sheet pile (6) of the steel pipe sheet pile (6) that was previously placed is slidably engaged with the joint part (8) of the steel pipe sheet pile (6) that is to be subsequently placed. 6) is built. The mud (slime) discharged by the drilling is put into the built-in steel pipe sheet pile (6).
Thereafter, the same process is repeated.
Thus, the erection (setting) of the steel pipe sheet pile (6) is completed.
[0025]
According to the placing method of the steel pipe sheet pile (6) and the guide pile (3) used in this method according to the present invention, before placing the steel pipe sheet pile (6), the sheet pile main body ( 7) The main hole (11) into which the steel pipe sheet pile (6) is inserted and the sub-hole (12) into which the joint portion (8) of the steel pipe sheet pile (6) is inserted are formed. The joint portion (8) of (6) is not deformed or damaged, and the steel pipe sheet pile (6) can be smoothly placed on the ground of any hardness.
[0026]
【The invention's effect】
According to the present invention, before the steel pipe sheet pile is placed, the main hole into which the main body of the steel pipe sheet pile is inserted and the sub-hole into which the joint portion of the steel pipe sheet pile is inserted are formed. In addition, the joint portion of the steel pipe sheet pile is not deformed or damaged, and the steel pipe sheet pile can be smoothly placed on the ground of any hardness.
[Brief description of the drawings]
FIG. 1 is a diagram showing a method for placing a steel pipe sheet pile according to the present invention.
FIG. 2 is a diagram showing a method for placing a steel pipe sheet pile according to the present invention.
FIGS. 3A and 3B are diagrams showing a connected state of steel pipe sheet piles according to the present invention, wherein FIG. 3A is a plan view showing an example thereof, and FIG. 3B is a plan view showing another example.
FIG. 4 is a plan view showing a guide pile according to the present invention.
FIG. 5 is a view showing an example of a connected state of a joint portion of a guide pile according to the present invention.
FIG. 6 is a diagram showing an example of a usage state of each down-the-hole hammer in the present invention.
FIG. 7 is a diagram showing another example of the usage state of each down-the-hole hammer in the present invention.
[Explanation of symbols]
1. Guide pile body 2 ... Guide pile sub-body 3 ... Guide pile 4 ... Down-the-hole hammer 5 for main body ... Down-the-hole hammer 6 for sub-body ··· Steel pipe sheet pile 7 ··· Sheet pile body 8 ··· Joint portion 9 ··· Drilling hole 10 ··· Bit 11 ··· Main hole 12 ··· Sub-hole 21 ··· Shoe d ... Distance between main bodies

Claims (3)

Down-the-hole hammer for the main body having a guide pile comprising a cylindrical guide pile main body and a guide pile sub-body provided on the outer surface of the guide pile main body along the longitudinal direction thereof, and a bit capable of expanding and contracting the diameter The body down-the-hole hammer is inserted into the guide pile body and the bit of the body down-the-hole hammer protrudes from the tip of the guide pile body in an expanded state, and the sub-body down-the hole is used. A hammer is inserted into the guide pile sub-body and a bit of the down-the-hole hammer for the sub-body is protruded from the tip of the guide pile sub-body in an expanded state, and the shoe attached to the inner surface of the lower end of the guide pile body The hammer is rotatably disposed while pressing the down-the-hole hammer for the main body and is attached to the inner surface of the lower end of the guide pile sub-body. The drilling by each bit is started in a state where the hammer is disposed rotatably while pressing the down-the-hole hammer for the sub body to the main body and the steel pipe sheet pile in which the main body of the steel pipe sheet pile is built by this drilling operation. After forming the sub-hole in which the joint portion of the steel pipe is built, the guide pile and each down-the-hole hammer are pulled out from the main hole and the sub-hole, and then the main body of the steel pipe sheet pile is built in the main hole and Placing a joint portion of the steel pipe sheet pile in the sub-hole, and the sub-hole has a diameter capable of installing both joint portions provided for the connection of the connected steel pipe sheet piles. Method. A down-the-hole for excavating a hole into which a steel pipe sheet pile composed of a main body and a joint portion is built while having a cylindrical guide pile main body and a guide pile sub-body provided along the longitudinal direction on the outer surface of the guide pile main body It is a guide pile that guides the hammer in the direction of excavation and is pulled out from the excavation hole after completion of excavation, and the guide pile main body can be inserted with a down-the-hole hammer for a body having a bit whose diameter can be expanded and contracted. The pile pile is a guide pile for placing a steel pipe sheet pile, characterized in that a down-the-hole hammer for a secondary body provided with a bit whose diameter can be expanded and contracted can be inserted. The diameter of the guide pile main body is set to be substantially the same as the diameter of the main body of the steel pipe sheet pile, and the diameter of the guide pile sub-body is set to be substantially the same as the distance between the main bodies of the connected steel pipe sheet piles. A guide pile for placing a steel pipe sheet pile according to claim 2.

Images