JP2015121051A - Ruler for installation of steel pipe sheet pile, installation method of steel pipe sheet pile, and turning excavator for use in installation method of steel pipe sheet pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an installation method of a steel pipe sheet pile which can be applied to the ground or the like in which bedrock and an in-ground concrete construction which is constructed in the past exist.SOLUTION: An installation method of a steel pipe sheet pile includes: a process for building up a first steel pipe sheet pile 10 by using a ruler; a process for piling the first steel pipe sheet pile 10 into bedrock by using a vibration-type piling machine; a process for performing tip-hole drilling by using a down-the-hole hammer; a process for pulling up the first steel pipe sheet pile 10, making a rotating excavator 4 penetrate the steel pipe sheet pile 10, and downwardly setting and fixing a blade of a cutting part 4c of the rotating excavator; a process for pressure-inserting the first steel pipe sheet pile 10 into the bedrock by using the vibration-type excavator while cutting the bedrock by using the rotating excavator 4; a process for upwardly setting an orientation of the blade of the rotating excavator 4 when hole-drilling is completed up to a preset depth, driving the rotating excavator 4 once again, and upwardly excavating the bedrock; a process for removing the rotating excavator 4 from the first steel pipe sheet pile 10 when pulled up from a hole of the bedrock; and a process for placing concrete succeeding to slime treatment.

Description

The present invention relates to a steel pipe sheet pile placing method, a swivel excavator used in the method, and a steel pipe pile. In the present specification, the obstacle ground is a concept including a hard rock, an underground concrete structure built in the past in the soil, and a rock in the sedimentary layer.

The following methods are known as methods for placing steel pipe sheet piles. That is, in a method of using a down-the-hole hammer having a bit whose diameter can be enlarged / reduced, first, the down-the-hole hammer having a reduced diameter is inserted into a steel pipe body of a steel pipe sheet pile together with a rotating rod connected to the hammer, The diameter of the bit coming out from the tip of 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.

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. Therefore, since the conventional placing method described above is a method performed by inserting the down-the-hole hammer only into the steel pipe body, when the steel pipe sheet pile is placed, the joint portion must be pushed against the ground to advance. It will not be. 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.

As a method for solving such a problem of the prior art, Patent Literature 1 includes 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. Using the guide pile and the down-the-hole hammer for the main body and the down-the-hole hammer for the sub body provided with the bit whose diameter can be enlarged / reduced, the down-the-hole hammer for the main body is inserted into the guide pile main body and the tip of the guide pile main body A bit of the down-the-hole hammer for the main body is projected in an expanded state, and the down-the-hole hammer for the sub-body is inserted into the guide pile sub-body and the bit of the down-the-hole hammer for the sub body is expanded from the tip of the guide pile sub-body. The hammer is rotated while pressing the down-the-hole hammer for the main body against a shoe attached to the inner surface of the lower end of the guide pile main body. Drilling with each bit in a state where the hammer is rotatably arranged while pressing the down-the-hole hammer for the subsidiary body against the shoe attached to the inner surface of the lower end of the subsidiary body of the guide pile. After the main hole into which the main body of the steel pipe sheet pile is built by the drilling operation 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. Thereafter, the main body of the steel pipe sheet pile is built in the main hole, and a joint portion of the steel pipe sheet pile is built in the sub hole, and the sub hole is used for both connections of the connected steel pipe sheet piles. A steel pipe sheet pile driving method characterized in that the diameter of the steel sheet pile can be installed is disclosed.

Patent Document 1 includes 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 a steel pipe sheet pile made of the main body and a joint portion. This is a guide pile that guides the down-the-hole hammer that excavates the hole to be inserted in the direction of digging, and is pulled out from the drill hole after completion of the excavation. A guide pile for placing a steel pipe sheet pile, in which a down-the-hole hammer for a sub body provided with a bit whose diameter can be expanded and contracted, can be inserted.

On the other hand, according to claim 1 of Patent Document 2, in the method of placing a steel pipe sheet pile using a vibro hammer, in a state where anti-rotation jigs for preventing rotation of the steel pipe sheet pile are installed on both sides of one steel pipe sheet pile, A space for one steel pipe sheet pile is provided between the first steel pile sheet pile and another steel pipe sheet pile, and the one steel pipe sheet pile is placed. The second steel pipe sheet pile is placed in a state where a space for at least one steel pipe sheet pile is provided on the opposite side, and the rotation prevention jig is installed on both sides of the other steel sheet pile sheet. A method comprising a reference pile placing step and a closed pile placing step in which one steel pipe sheet pile is placed between the one steel pipe sheet pile and the other steel pipe sheet pile is disclosed. And according to invention of Claim 1 of patent document 2, even if a steel pipe sheet pile tries to rotate by the vibration of a vibro hammer, a joint pipe is restrained by the joint pipe fixing port of the rotation prevention jig installed in the both sides. In addition, the rotation accuracy is prevented and the interval accuracy of the steel pipe sheet pile joint portion is increased. As a result, the accuracy of steel pipe sheet pile installation will be better than in the prior art, so the mortar material injected into the joint will be lost, the joint efficiency will be lowered, the water stoppage of the joint will be reduced, and the safety of construction will be reduced due to the reduced joint efficiency. It is said that problems such as reduction and material cost loss due to material loss are improved from the prior art. In addition, because the steel pipe sheet piles to be placed in advance, that is, the reference piles are all independent, the range affected by the existing steel pipe sheet piles is also reduced, and construction can be performed more accurately, and the steel pipe sheet piles to be placed between them Also, because it is only necessary to place in accordance with the steel pipe sheet piles that were previously placed on both sides, it can be constructed with the same precision, for example, in the case of a well-shaped steel pipe sheet pile foundation, It is also said that it is difficult to occur that the cross section is not closed as predetermined due to the accumulation of the inclination, rotation, and planar displacement of steel pipe sheet piles that occur when placing them one by one in order.

In Patent Document 2, it is an essential constituent requirement that a space for one steel pipe sheet pile adjacent to one placed steel pipe sheet pile is provided and another steel pipe sheet pile is placed.

 In order to solve such technical problems, Claim 1 of Patent Document 3 discloses that when pile materials such as steel pipe sheet piles are placed in the ground by a vibration pile driving machine such as a vibratory hammer. In a placement ruler that guides in a predetermined placement direction, at least a pair of guide piles whose lower end portions are placed in the ground, and a first receiving material that is constructed between these at least a pair of guide piles and is in contact with the ground And a plurality of support frames that are located above the first receiving material and have a second receiving material that is laid between the upper ends of the at least one pair of guide piles, with a predetermined interval therebetween. And a pair of first members slidably sandwiched between the plurality of first receiving members of the support portion and the pile material in the direction of placing the pile material. A bridge frame and a plurality of second receiving members of the support portion, And a pair of second guide frames that slidably hold the pile material along a direction in which the pile material is placed, and the pair of second guide frames includes the pair of second guide frames. There is disclosed a placement ruler characterized by comprising slide means for sliding a frame along the length direction of the plurality of second receiving members.

Further, according to claim 2 of Patent Document 3, in the ruler for placing according to claim 1, a stopper member that restricts sliding of the pair of second guide frames is provided on the second receiving material. The pile member is provided detachably at a predetermined position in the length direction of the receiving material, and in claim 3, the pile material is vertically placed in the ground using the ruler for placing according to claim 2. A method for placing a pile material to be placed, wherein the ruler for placement is installed at a position where the pile material is placed, and the pile material is attached to the pair of first guide frames and a pair of While being clamped by the second guide frame, the pair of stopper members restricts the pair of second guide frames from sliding in a direction away from each other. After being driven by the vibration pile driver so as to reach the vicinity of the second guide frame of the After removing the stopper member from the second receiving material, the pair of second guide frames are slid in a direction in which the pair of second guide frames are separated from each other, and then the pile material is moved to the upper end of the pile material. A pile material placing method is disclosed, wherein the pile material is placed by the vibration pile driver so that the portion reaches the vicinity of the pair of first guide frames.

However, in the method of Patent Document 3, as a ruler, the pile material is laid between a plurality of second receiving members laid between the upper ends of the pair of guide piles, and the pile material is slidably held along the placing direction. It is essential to use a pair of guide frames provided with slide means along the length direction of the second receiving material, and the configuration is somewhat complicated. Also, it is assumed that pile material will be driven using a vibration pile driver, and the use of drilling holes such as rotating bits is not described. There is a problem that it cannot be applied to the one where the underground concrete structure constructed in 1 is present in the soil and the one where the rock layer is present in the sedimentary layer. Furthermore, since the pile material is driven using the Patent Document 3 vibration type pile driving machine, the length of the joint cannot be shortened.

JP 2003-268768 A Japanese Patent No. 3245126 Japanese Patent No. 5080347

The problem to be solved is that the pile material (that is, steel pipe pile) cannot be swiveled. As a result, the bedrock (especially hard rock) and underground concrete structures built in the past are in the soil. It cannot be applied to existing ones or rocks in the sedimentary layer.

The ruler for placing the steel pipe sheet pile according to the first aspect of the present invention,
A plurality of long guiding piles that are placed on the obstacle ground and arranged opposite each other at a first distance along two rows of the first row and the second row, respectively.
A first lower guide portion made of a steel material extending along lower portions of a plurality of guide piles arranged and driven along the first row;
A second lower guide portion made of a steel material extending along lower portions of a plurality of guide piles arranged and driven along the second row,
A first upper guide portion made of a steel material extending on the pile heads of a plurality of guide piles that are arranged and driven along the first row, and a plurality of that are arranged and driven along the second row The gripping mechanism is composed of a second upper guide portion made of a steel material extending on the pile head of the lead pile, and a gripping mechanism for pressing and gripping the steel pipe sheet pile to each of the first lower guide portion and the second lower guide portion is a second one. It is characterized by being provided at a distance.

The method for placing the steel pipe sheet pile according to the second aspect of the present invention,
Using a ruler for placing the steel pipe sheet pile according to the first aspect, a hollow cylindrical steel pipe part, and a first sub-body part provided along the longitudinal direction on the outer surface of the steel pipe part, A steel pipe sheet pile consisting of a second sub-body part provided on the outer surface of the steel pipe part at a symmetrical position of the first sub-body part with respect to the axis of the steel pipe part, a vibration pile driver and a rotary excavator In combination, a steel pipe sheet pile placed so that the first sub-body of one steel pipe sheet pile of the two adjacent steel pipe sheet piles and the second sub-body of the other steel pipe sheet pile are engaged with each other. A placement method,
(A) a step of building a first steel pipe sheet pile using the ruler;
(B) The step of driving the first steel pipe sheet pile to the bedrock by the vibration pile driver,
(C) A step of pre-drilling using a down-the-hole hammer,
(D) After the step (c), the first steel pipe sheet pile is pulled up, the rotary excavator is inserted into the steel pipe sheet pile from the upper end part of the first steel pipe sheet pile, and the lower end part of the first steel pipe sheet pile Exposing the rotary cutting device from, and setting and fixing the direction of the blade of the cutting portion downward,
(E) a step of press-fitting the first steel pipe sheet pile into the bedrock by a vibration pile driver while cutting the bedrock by the rotary excavator;
(F) Once drilling is completed to a predetermined depth, the vibration pile driver and the rotary excavator are stopped, the blade direction of the rotary excavator is set upward, and the turning diameter is set as a step. In the case of (d), it is enlarged and fixed, the rotary excavator is driven again, excavated upward, and the rotary cutting device is exposed at the lower end of the first steel sheet pile from the hole (HL). A step of stopping the rotary excavator and removing it from the first steel sheet pile,
(G) After the step (f), following the slime treatment, placing the concrete;
(H) A step of building a second steel pipe sheet pile adjacent to the first steel pipe sheet pile that has been placed by the steps (a) to (g), wherein the first sub-pile of the first steel pipe sheet pile Building a second steel pipe sheet pile comprising a step of engaging the body or the second sub body with the second sub body or the first sub body of the second steel pipe sheet pile;
(I) A step of executing the steps (b) to (g) for the second steel pipe sheet pile instead of the first steel pipe sheet pile,
(J) For the third steel pipe sheet pile adjacent to the second steel pipe sheet pile, the step (a) is performed, and then the third steel pipe sheet pile instead of the first steel pipe sheet pile, the step (b ) To (g),
It is characterized by comprising.

The method for placing a steel pipe sheet pile according to the alternative of the second aspect, after placing 3 or 4 steel pipe sheet piles by the above method,
(K) After the step (j), a step of installing a fourth steel pipe sheet pile adjacent to the third steel pipe sheet pile, on the first and second upper guide portions using the ruler. Providing a guide tube and engaging the first sub-body or the second sub-body of the third steel pipe sheet pile with the second sub-body or the first sub-body of the fourth steel pipe sheet pile. The process of building 4 steel pipe sheet piles,
(L) After the step (j), a step of performing the steps (b) to (g) for the fourth steel pipe sheet pile instead of the first steel pipe sheet pile,
(M) For the fourth steel pipe sheet pile adjacent to the third steel pipe sheet pile, the step (a) is performed, and then the fourth steel pipe sheet pile instead of the first steel pipe sheet pile, the step (b ) To (g),
(N + 1) -th steel pipe sheet pile adjacent to the n-th steel pipe sheet pile, wherein a guide pipe is provided on the first and second upper guide portions using the ruler, (n + 1) comprising the step of engaging the first sub-body or the second sub-body of the n-th steel pipe sheet pile with the second sub-body or the first sub-body of the (n + 1) -th steel pipe sheet pile. The process of building the second steel pipe sheet pile,
For the (n + 1) -th steel pipe sheet pile instead of the first steel pipe sheet pile, executing the steps (b) to (g),
For the (n + 1) -th steel pipe sheet pile adjacent to the n-th steel pipe sheet pile, the step (a) is performed, and then the (n + 1) -th steel pipe sheet pile instead of the first steel pipe sheet pile, Including the step of performing steps (b) to (g), wherein n is an integer of 4 or more.

A third aspect of the present invention is a rotary excavator used in the steel pipe sheet pile placing method according to the first and second aspects,
A drilling main body part that is inserted into the steel pipe sheet pile from the upper end of the steel pipe sheet pile made of a hollow cylindrical steel pipe and is exposed and held outside the steel pipe sheet pile at the lower end of the steel pipe sheet pile;
A cutting part rotatably provided on the cutting body part;
A rotational drive source for applying a rotational force around the longitudinal axis of the steel pipe sheet pile to the cutting portion via a rotational force transmission mechanism;
The cutting section includes a plurality of cutters for excavating the obstacle ground in the longitudinal direction of the steel pipe sheet pile, and the cutter can be switched between two directions, a direction of moving forward toward the obstacle ground and a direction of retreating from the obstacle ground. And the length in the radial direction can be increased or decreased.

Further, the rotational force transmission mechanism is a shaft having one end connected to the rotational drive source and the other end connected to the cutting device, and a steady stop mechanism that rotatably supports the shaft within the steel pipe sheet pile. Is preferably provided.

According to the steel pipe sheet pile placing method of the present invention, since the use of a drilling method such as a rotating bit is used in combination, a rock mass (particularly a hard rock mass) or an underground concrete structure constructed in the past can be used. It can be applied to those that exist in the soil and those that have rock blocks in the sedimentary layer. According to the steel pipe sheet pile driving method of the present invention, the steel pipe sheet pile (pile material) is driven in combination with the use of a drilling hole such as a rotating bit, so that the length of the joint is shortened. Can do. Furthermore, according to the present invention, as a ruler, the first lower guide part and the second lower guide part are provided with a gripping mechanism that presses and grips the steel pipe sheet pile at a second distance. As a ruler described in claim 1 of Patent Document 3, the pile material is laid between a plurality of second receiving members laid between the upper ends of the pair of guide piles. The structure is simple compared to the case where a pair of guide frames that are slidably held along the installation direction is required to use a slide frame provided along the length direction of the second receiving material. . Furthermore, in Patent Document 2, although it is an essential constituent requirement to place a space for one steel pipe sheet pile adjacent to the one steel pipe sheet pile placed, the other steel pipe sheet pile is provided as an essential constituent requirement. There is no need for this, and since the next steel pipe sheet pile adjacent to the placed steel pipe sheet pile can be built and placed, the placing method is simple.

It is side surface explanatory drawing which shows an example of the ruler for placing of the steel pipe sheet pile which concerns on one Embodiment of this invention. It is a plane explanatory view showing an example of a ruler for placing a steel pipe sheet pile according to an embodiment of the present invention. It is side surface explanatory drawing which shows an example of the rotary excavation apparatus used for the placement method of the steel pipe sheet pile which concerns on other embodiment of this invention. FIG. 4 is a partially cutaway side view illustrating a state in which the cutting portion of the rotary excavator in FIG. 3 is cut downward. It is a partially notched side surface explanatory view which shows the state which cuts the cutting part of the rotary excavation apparatus of FIG. 3 upward. FIG. 4 is an explanatory plan view of the rotary excavator in FIG. 3. It is a plane explanatory view showing the relation of two adjacent steel pipe sheet piles cast by the steel pipe sheet pile placing method of one embodiment of the present invention. It is a section explanatory view showing the shape of the hole drilled by the placing method of the steel pipe sheet pile of one embodiment of the present invention. It is a schematic diagram which shows the engagement method at the time of driving | operation of the relationship of two adjacent steel pipe sheet piles cast | placed by the casting method of the steel pipe sheet pile of one Embodiment of this invention, and also one steel pipe sheet pile. . It is side explanatory drawing which shows the process of placing one steel pipe sheet pile further in addition to the three steel pipe sheet piles cast | placed by the casting method of the steel pipe sheet pile of one Embodiment of this invention. It is side explanatory drawing which shows the process of placing one steel pipe sheet pile further in addition to the three steel pipe sheet piles cast | placed by the casting method of the steel pipe sheet pile of one Embodiment of this invention. It is side explanatory drawing which shows the process of placing one steel pipe sheet pile further in addition to the three steel pipe sheet piles cast | placed by the casting method of the steel pipe sheet pile of one Embodiment of this invention. It is side explanatory drawing which shows the process of placing one steel pipe sheet pile further in addition to the three steel pipe sheet piles cast | placed by the casting method of the steel pipe sheet pile of one Embodiment of this invention. It is side explanatory drawing which shows the process of placing one steel pipe sheet pile further in addition to the three steel pipe sheet piles cast | placed by the casting method of the steel pipe sheet pile of one Embodiment of this invention. It is side explanatory drawing which shows the process of placing one steel pipe sheet pile further in addition to the three steel pipe sheet piles cast | placed by the casting method of the steel pipe sheet pile of one Embodiment of this invention. It is side explanatory drawing which shows the process of placing one steel pipe sheet pile further in addition to the three steel pipe sheet piles cast | placed by the casting method of the steel pipe sheet pile of one Embodiment of this invention. It is side explanatory drawing which shows the process of placing one steel pipe sheet pile further in addition to the three steel pipe sheet piles cast | placed by the casting method of the steel pipe sheet pile of one Embodiment of this invention.

A ruler for placing a steel pipe sheet pile according to an embodiment of the present invention will be described with reference to the accompanying drawings.
Referring to FIGS. 1 to 3, the ruler for placing the steel pipe sheet pile of the present embodiment has a first distance (D1) along two rows of the first row (A) and the second row (B), respectively. ) A plurality of long lead piles (1A, 1B) placed on the obstacle ground (R) so as to be separated from each other and spaced apart from each other (without limitation, for example, using H-shaped steel) The first lower guide portion (3A) and the second portion made of steel material extending along the lower portions of the plurality of guide piles (1A) arranged and placed along the first row (A) A lower guide part (3) composed of a second lower guide part (3B) made of a steel material extending along the lower part of a plurality of guiding piles (1B) placed in line along the row (B); A first upper guide made of a steel material extending on the pile heads of a plurality of guide piles (1A) arranged in line along the first row (A) (2A) and the upper guide comprised from the 2nd upper guide part (2B) which consists of steel materials extended on the pile head of the several guide pile (1B) arranged and laid along the 2nd row | line | column (B) A gripping mechanism (G) configured to press and grip the steel pipe sheet pile (10) to each of the first lower guide portion (3A) and the second lower guide portion (3B) at a second distance. (D2) is provided open.

Below, with reference to FIGS. 3-17, the placement method of a steel pipe sheet pile is demonstrated to other embodiment of this invention.
The steel pipe sheet pile placing method of the present embodiment uses the above-described ruler for placing the steel pipe sheet pile, and in the longitudinal direction on the outer surface of the hollow cylindrical steel pipe portion (10a) and the steel pipe portion (10a). A second sub-unit (10b) provided on the outer surface of the steel pipe part (10a) at a symmetrical position of the first sub-body part (10b) with respect to the axis of the first sub-body part (10b) and the steel pipe part (10a). Two steel pipe sheet piles (10) adjacent to a plurality of steel pipe sheet piles (10) using a vibration pile driver and a rotary excavator together with a steel pipe sheet pile (10) composed of the sub-body part (10c). , 10) A steel pipe sheet pile placing method in which the first sub body (10b) of one steel pipe sheet pile (10) and the second sub body (10c) of the other steel pipe sheet pile (10) are engaged. It is. The vibration pile driver is not limited to a specific one. For example, a known pile driver such as a vibro hammer, a grab hammer, or a down-the-hole hammer can be used. Moreover, it is preferable to use the thing of other embodiment mentioned later for a rotary excavation apparatus.

And the placing method of the steel pipe sheet pile of this embodiment includes the following process.
Step (a): The first steel pipe sheet pile (10) is built using the above-mentioned ruler.
The following steps (b) to (h) will be described on the assumption that there is no existing steel pipe sheet pile.
Process (b): A 1st steel pipe sheet pile (10) is driven to a bedrock by vibration type pile driving machines, such as the above-mentioned vibro hammer, a grab hammer, and a down-the-hole hammer (refer FIG. 10).
Step (c): The first steel pipe sheet pile (10) is once raised (see FIG. 11) (there is a shallow hole (H)). Next, a down-the-hole hammer is mounted on the steel pipe sheet pile (10), and a pre-drilled hole is formed using the down-the-hole hammer (see FIG. 12).
Step (d): After the step (c), the first steel pipe sheet pile (10) is pulled up (a small-diameter hole (Hs) is generated at this time). Next, the rotary excavator (4a, 4b, 4c) is inserted into the steel pipe sheet pile (10) from the upper end part of the first steel pipe sheet pile (10), and the lower end part of the first steel pipe sheet pile (10). Then, the rotary cutting device (4b, 4c) is exposed, and the direction of the blade (C) of the cutting portion (4c) is set downward and fixed (see FIG. 13).
Step (e): While cutting the rock mass (R) with the rotary excavator (4a, 4b, 4c), the first steel pipe sheet pile (10) is press-fitted into the rock mass (R) with the vibration pile driver (Fig. 14).
Step (f): Once the drilling is completed to a predetermined depth (D3), the vibration pile driver and the rotary excavator (4a, 4b, 4c) are stopped once, and the rotary excavator (4a, 4b, 4c) is set with the blade (C) facing upward, the turning diameter is set larger than that in the step (d) and fixed (see FIG. 15), and the rotary excavator (4a, 4b, 4c) again. And excavating upward, and when the rotary cutting device (4c) is exposed at the lower end of the first steel pipe sheet pile (10), the rotary excavator (4a, 4b, Step 4c) is stopped, and the rotary excavator (4a, 4b, 4c) is removed from the first steel pipe sheet pile (10) (g): Concrete is placed following the slime treatment.
This completes the placement of the first steel pipe sheet pile.

Next, step (h) (a step of building a second steel pipe sheet pile adjacent to the first steel pipe sheet pile (10) that has been placed by the steps (a) to (g)): the first steel pipe sheet pile (10 The first sub-body (10a) or the second sub-body (10b) is engaged with the second sub-body (10b) or the first sub-body (10a) of the second steel sheet pile (10). Here, with reference to FIG. 7 and 9, the engagement relationship of two adjacent steel pipe sheet piles (10, 10) is demonstrated. A first sub-body (10b) made of a plurality of small-diameter steel pipes is welded to the left outer surface of the steel pipe part (10a) constituting one steel pipe sheet pile (10) in the longitudinal direction of the steel pipe part (10a). . A slit (SL) is formed in the longitudinal direction of the first sub-body (10a). On the other hand, on the right side of the steel pipe portion (10a), the second sub-body (10c) made of a steel material having a T-shaped cross section is symmetrical with respect to the opposite side of the first sub-body (10a) (the axis of the steel pipe portion (10a)). Is formed on the outer surface. Therefore, as shown in FIG. 9, in order to engage the right steel pipe sheet pile (10) so as to be adjacent to the left steel pipe sheet pile (10), the right steel pipe sheet pile (10) The T-shaped second sub-body (10c) of the left steel pipe sheet pile (10) is fitted through the slit (SL) of the right steel pipe sheet pile (10) from above the steel pipe sheet pile (10). As shown in FIG. 7, after the placement is completed, a sunny hose (not shown) is inserted into the engaging portion of the first sub body (10b) and the second sub body (10c), and the mortar (M) is inserted. It is also possible to fill, thereby providing a water stop.
Step (i): Steps (b) to (g) are performed on the second steel pipe sheet pile (10) instead of the first steel pipe sheet pile (10).
Step (j): For the third steel pipe sheet pile (10) adjacent to the second steel pipe sheet pile (10), the step (a) is performed, and then the third steel pipe sheet pile instead of the first steel pipe sheet pile, The steps (b) to (g) are performed.
In this way, three steel pipe sheet piles (10, 10, 10) are driven adjacent to each other, and the above steps are further repeated,
That is,
(N + 1) -th steel pipe sheet pile adjacent to the n-th steel pipe sheet pile, wherein a guide pipe is provided on the first and second upper guide portions using the ruler, (n + 1) comprising the step of engaging the first sub-body or the second sub-body of the n-th steel pipe sheet pile with the second sub-body or the first sub-body of the (n + 1) -th steel pipe sheet pile. The process of building the second steel pipe sheet pile,
For the (n + 1) -th steel pipe sheet pile instead of the first steel pipe sheet pile, executing the steps (b) to (g),
For the (n + 1) -th steel pipe sheet pile adjacent to the n-th steel pipe sheet pile, the step (a) is performed, and then the (n + 1) -th steel pipe sheet pile instead of the first steel pipe sheet pile, By executing the steps (b) to (g) (where n is an integer of 4 or more), an arbitrary number of steel pipe sheet piles can be placed.

The steel pipe sheet pile placing method according to the alternative of the present embodiment includes the following steps (h) to (m) after placing three or four steel pipe sheet piles as ruler piles by the above method. Run.

Step (h): (After the step (j), the fourth steel pipe sheet pile (10) adjacent to the third steel pipe sheet pile (10) is built in) Using the above-mentioned ruler, the first upper guide part A guide pipe (GP) is provided on (2A) and the second upper guide part (2B), the first subbody (10b) or the second subbody (10c) of the third steel pipe sheet pile (10), The second sub-body (10c) or the first sub-body (10b) of the fourth steel pipe sheet pile (10) is engaged.
Step (l): After the step (j), the steps (b) to (g) are performed on the fourth steel pipe sheet pile (10) instead of the first steel pipe sheet pile (10).
Step (m) For the fourth steel pipe sheet pile (10) adjacent to the third steel pipe sheet pile (10), the step (a) is executed, and then the fourth steel pipe sheet pile (10) is replaced with the fourth steel pipe sheet pile (10). Steps (b) to (g) are performed on the steel pipe sheet pile (10).
According to the above-described embodiment, as shown in FIG. 8, in addition to the hole (HL) obtained conventionally (see FIG. 8 (a)), the hole (HLc) (see FIG. 8 (b)). , (HLs) (see FIG. 8C).

Referring to FIGS. 3 to 6, a rotary excavator (4a, 4b, 4c) used in a steel pipe sheet pile placing method according to still another embodiment of the present invention includes a steel pipe sheet pile (10) comprising a hollow cylindrical steel pipe. ) Is inserted into the steel pipe sheet pile (10) from the upper end of the steel pipe sheet pile, and the drilled main body part (4b) is exposed and held outside the steel pipe sheet pile (10) at the lower end of the steel pipe sheet pile (10). A cutting part (4c) provided rotatably on the cutting part, and a rotational force around the longitudinal axis of the steel sheet pile (10) is applied to the cutting part via a rotational force transmission mechanism (4a) (for example, a long shaft). A rotational drive source (5) is provided.

The cutting part (4c) includes a plurality of cutters (c) for excavating the obstacle ground (R) in the longitudinal axis direction of the steel pipe sheet pile (10). The cutter (c) is provided so as to be switchable between two directions, a direction of moving forward toward the obstacle ground (R) and a direction of retreating from the obstacle ground (R), and the length in the radial direction can be increased or decreased. It has been. For example, the cutting portion (4c) shown in FIGS. 4 and 5 is pivotally supported by a sleeve (4bs) slidably provided on the cutting main body portion (4b). ) Is realized by using a hydraulic cylinder (HC) having one end fixed to the cutting body (4b) and the other end fixed to the cutting part (4c).
It is characterized by that.

In the present embodiment, as described above, the rotational force transmission mechanism (4a) employs a shaft having one end connected to the rotational drive source (5) and the other end connected to the cutting device (4c). An anti-sway mechanism (4) that supports the shaft rotatably in the steel pipe sheet pile (10) is preferably provided.

According to the present invention, the use of drilling by a swivel method, such as a rotating bit, is combined, so that the rock (particularly hard rock) and underground concrete structures built in the past exist in the soil, It can be applied to those in which sedimentary rocks exist. And according to this invention, since the steel pipe sheet pile (pile material) is driven together using use of the drilling by a turning method, such as a rotation bit, the length of a joint can be shortened. Furthermore, according to the present invention, as a ruler, the first lower guide part and the second lower guide part are provided with a gripping mechanism that presses and grips the steel pipe sheet pile at a second distance. As a ruler described in claim 1 of Patent Document 3, the pile material is laid between a plurality of second receiving members laid between the upper ends of the pair of guide piles. The structure is simple compared to the case where a pair of guide frames that are slidably held along the installation direction is required to use a slide frame provided along the length direction of the second receiving material. . Furthermore, in Patent Document 2, although it is an essential constituent requirement to place a space for one steel pipe sheet pile adjacent to the one steel pipe sheet pile placed, the other steel pipe sheet pile is provided as an essential constituent requirement. There is no need for this, and since the next steel pipe sheet pile adjacent to the placed steel pipe sheet pile can be built and placed, the placing method is simple.

1, 1A, 1B Lead pile 2 Upper guide part 2A First upper guide part 2B Second upper guide part 3 Lower guide part 3A First lower guide part 3B Second lower guide part 4 Rotating excavator 4a Rotational force Transmission mechanism (shaft)
4b Cutting body portion 4bs Sleeve 4c Cutting portion 5 Rotation drive source 10 Steel pipe sheet pile 10a Steel pipe portion 10b First sub body 10c Second sub body G Grip mechanism A First row B Second row Gh Hydraulic cylinder Gg Gripper GP Guide pipe HC Hydraulic pressure Cylinder C Cutter (blade)
Ca preceding bit R obstacle ground

Claims (5)

A plurality of long guiding piles that are placed on the obstacle ground and arranged opposite each other at a first distance along two rows of the first row and the second row, respectively.
A first lower guide portion made of a steel material extending along lower portions of a plurality of guide piles arranged and driven along the first row;
A second lower guide portion made of a steel material extending along lower portions of a plurality of guide piles arranged and driven along the second row,
A first upper guide portion made of a steel material extending on the pile heads of a plurality of guide piles that are arranged and driven along the first row, and a plurality of that are arranged and driven along the second row The gripping mechanism is composed of a second upper guide portion made of a steel material extending on the pile head of the lead pile, and a gripping mechanism for pressing and gripping the steel pipe sheet pile to each of the first lower guide portion and the second lower guide portion is a second one. A ruler for placing a steel pipe sheet pile characterized by being provided at a distance. Using the ruler for placing the steel pipe sheet pile according to claim 1, a hollow cylindrical steel pipe part, a first sub-body part provided along the longitudinal direction on the outer surface of the steel pipe part, and A steel pipe sheet pile composed of a second sub-body portion provided on the outer surface of the steel pipe portion at a symmetrical position of the first sub-body portion with respect to the axis of the steel pipe portion is used in combination with a vibration pile driver and a rotary excavator. Then, the steel pipe sheet pile driven so that the first sub body of one steel pipe sheet pile of the two adjacent steel pipe sheet piles and the second sub body of the other steel pipe sheet pile are engaged with each other. It is a construction method,
(A) a step of building a first steel pipe sheet pile using the ruler;
(B) The step of driving the first steel pipe sheet pile to the bedrock by the vibration pile driver,
(C) A step of pre-drilling using a down-the-hole hammer,
(D) After the step (c), the first steel pipe sheet pile is pulled up, the rotary excavator is inserted into the steel pipe sheet pile from the upper end part of the first steel pipe sheet pile, and the lower end part of the first steel pipe sheet pile Exposing the rotary cutting device from, and setting and fixing the direction of the blade of the cutting portion downward,
(E) a step of press-fitting the first steel pipe sheet pile into the bedrock by a vibration pile driver while cutting the bedrock by the rotary excavator;
(F) Once drilling is completed to a predetermined depth, the vibration pile driver and the rotary excavator are stopped, the blade direction of the rotary excavator is set upward, and the turning diameter is set as a step. In the case of (d), it is enlarged and fixed, the rotary excavator is driven again, excavated upward, and the rotary cutting device is exposed at the lower end of the first steel sheet pile from the hole (HL). A step of stopping the rotary excavator and removing it from the first steel sheet pile,
(G) After the step (f), following the slime treatment, placing the concrete;
(H) A step of building a second steel pipe sheet pile adjacent to the first steel pipe sheet pile that has been placed by the steps (a) to (g), wherein the first sub-pile of the first steel pipe sheet pile Building a second steel pipe sheet pile comprising a step of engaging the body or the second sub body with the second sub body or the first sub body of the second steel pipe sheet pile;
(I) A step of executing the steps (b) to (g) for the second steel pipe sheet pile instead of the first steel pipe sheet pile,
(J) For the third steel pipe sheet pile adjacent to the second steel pipe sheet pile, the step (a) is performed, and then the third steel pipe sheet pile instead of the first steel pipe sheet pile, the step (b ) To (g),
A method of placing a steel pipe sheet pile, comprising: After placing 3 or 4 steel pipe sheet piles by the steel pipe sheet pile placing method according to claim 2,
(K) After the step (j), a step of installing a fourth steel pipe sheet pile adjacent to the third steel pipe sheet pile, on the first and second upper guide portions using the ruler. Providing a guide tube and engaging the first sub-body or the second sub-body of the third steel pipe sheet pile with the second sub-body or the first sub-body of the fourth steel pipe sheet pile. The process of building 4 steel pipe sheet piles,
(L) After the step (j), a step of performing the steps (b) to (g) for the fourth steel pipe sheet pile instead of the first steel pipe sheet pile,
(M) For the fourth steel pipe sheet pile adjacent to the third steel pipe sheet pile, the step (a) is performed, and then the fourth steel pipe sheet pile instead of the first steel pipe sheet pile, the step (b ) To (g),
(N + 1) -th steel pipe sheet pile adjacent to the n-th steel pipe sheet pile, wherein a guide pipe is provided on the first and second upper guide portions using the ruler, (n + 1) comprising the step of engaging the first sub-body or the second sub-body of the n-th steel pipe sheet pile with the second sub-body or the first sub-body of the (n + 1) -th steel pipe sheet pile. The process of building the second steel pipe sheet pile,
For the (n + 1) -th steel pipe sheet pile instead of the first steel pipe sheet pile, executing the steps (b) to (g),
For the (n + 1) -th steel pipe sheet pile adjacent to the n-th steel pipe sheet pile, the step (a) is performed, and then the (n + 1) -th steel pipe sheet pile instead of the first steel pipe sheet pile, A method for placing a steel pipe sheet pile comprising the steps of performing steps (b) to (g), wherein n is an integer of 4 or more. A rotary excavator used in a steel pipe sheet pile placing method,
A drilling main body part that is inserted into the steel pipe sheet pile from the upper end of the steel pipe sheet pile made of a hollow cylindrical steel pipe and is exposed and held outside the steel pipe sheet pile at the lower end of the steel pipe sheet pile;
A cutting part rotatably provided on the cutting body part;
A rotational drive source for applying a rotational force around the longitudinal axis of the steel pipe sheet pile to the cutting portion via a rotational force transmission mechanism;
The cutting section includes a plurality of cutters for excavating the obstacle ground in the longitudinal direction of the steel pipe sheet pile, and the cutter can be switched between two directions, a direction of moving forward toward the obstacle ground and a direction of retreating from the obstacle ground. A rotary excavator characterized in that it is provided in such a manner that its length in the radial direction can be increased or decreased. The rotational force transmission mechanism is a shaft having one end connected to the rotational drive source and the other end connected to the cutting device, and a steadying mechanism is provided for rotatably supporting the shaft within the steel pipe sheet pile. The rotary excavation device according to claim 4.