JP2005171596A - Cylindrical casing driving construction method, ruler for driving and gripping tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the occurrence of nonclosure between a sheet pile 1a driven in the first place and a sheet pile 1j to be driven finally, by improving a technology for forming a cylindrical casing such as E by driving a large number of sheet piles 1a-1j. <P>SOLUTION: As indicated in (A) and (B), a ruler of arranging sheet pile-shaped tools 3a to 3e every other one piece, is arranged on the ground surface. As indicated in (C), the sheet piles 1a, 1c, etc. are driven every other one piece in the shape of filling up "clearance of the sheet pile-shaped tool". The sheet pile-shaped tool is removed, and is put in a state of (D). The sheet pile 1b is driven between the sheet piles 1a, 1c, ...1i driven every other one piece. When driving the sheet piles 1d, 1f...1j, the cylindrical casing as (E) is completed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a technique for forming a cylindrical casing by driving a large number of sheet piles into the ground. The present invention relates to a particularly suitable sheet pile gripper.

For example, when constructing a bridge pier for an elevated railway or an elevated road, an operation of forming a cylindrical casing by arranging a number of steel sheet piles and placing them in the ground is performed.
The cylindrical shape may be a columnar shape or a prismatic shape. In addition, there are cases in which an embedded casing with almost the entire length of the steel sheet pile is driven into the ground and used as the foundation. May be configured. In either case, the present invention is applicable.
FIG. 8 is a plan view for explaining a cylindrical casing constituted by a large number of sheet piles.
(A) is an example in which ten vertically divided cylindrical sheet piles for a cylindrical casing are arranged to form a cylindrical casing, and the sheet piles 1a and 1b to 1j are combined with each other. The part shown with the code | symbol 2 is a coupling | joint, The expansion detail is shown to (B).
FIG. 8C illustrates three of many steel sheet piles when a cylindrical casing is formed using a continuous steel sheet pile.
“Casing” is a predicate that is commonly used in the art, but the JIS Industrial Glossary describes “a pipe that is inserted into a well for drilling and finishing purposes”.
JIS Industrial Terminology Dictionary, Japanese Standards Association edited and published

A closed curve (for example, a circle) is established on the ground, and as shown in FIG. 9A, a sheet pile 1a, a sheet pile 1b,... Are sequentially placed along the closed curve, and finally a sheet pile 1i and a sheet pile 1j. In many cases, the joints of both sheet piles 1j and 1a cannot reach as shown in section a. In addition, there are not a few cases where the sheet piles 1j and 1a overlap each other as shown in FIG. 9B and the joint cannot be fitted.
The reason for this is that when a large number (10 in this example) of sheet piles are sequentially joined and driven, even if the dimensional error of one joint is small, a large number (9 in this example) The error of the joint portion is accumulated, and the last sheet pile 1a and the last sheet pile 1j cannot be combined. Such a malfunction is referred to as “not closing”.

FIG. 10 is a schematic perspective view for explaining another cause of upsetting the combination of the first sheet pile and the last sheet pile.
8 and 9, reference numeral 1 a is a sheet pile that is first driven, reference numeral 1 i is a sheet pile that is driven second from the end, and reference numeral 1 j is a sheet pile that is to be driven last. .
Since the ground into which the sheet pile is driven is not necessarily homogeneous and changes in hardness, even if the sheet pile is driven by a pile driving machine located on the ground, it is not easy to penetrate vertically.
In addition, as will be described in detail later with reference to FIG. 7, (see FIG. 10) the action line of the force (arrow P) for press-fitting the sheet pile 1i into the ground, and the penetration resistance force (arrow R) that the sheet pile 1i receives from the ground When the action line is not located on the same straight line, a couple is generated, and the verticality of the sheet pile 1i is deviated or the sheet pile 1i is bent.

In the state illustrated in FIG. 10, the parallelism between the first sheet pile 1a and the last sheet pile 1i from the last is poor, and the joint interval is the dimension i at the upper end of both sheet piles. The joint interval at the lower end is dimension I> i.
For this reason, when the last sheet pile 1j is driven, even if it seems that the joint interval dimension i matches and closes at the upper end portion of the sheet pile appearing on the ground, the final sheet pile sinks as the last sheet pile 1j is driven. The speed decreases and stops halfway.
In this case, when the inside of the unfinished casing was dug up for research, it was confirmed that the sheet pile 1i was bent as shown in FIG.
The present invention has been made in view of the above circumstances, and the object of the present invention is to construct a cylindrical casing by sequentially driving a large number of sheet piles, and to easily form the large number of sheet piles, and It is in providing the technology to make sure closure.

In order to achieve the above-mentioned purpose of “closing the sheet pile”, the present invention includes “the misalignment of the joint between the first sheet pile and the last sheet pile” described with reference to FIG. 9 and “the bending of the sheet pile” described with reference to FIG. 10. Eliminate both.
Since there are multiple causes of sheet pile incoherence, there are also several technologies created to prevent this, but all of these techniques "prevent the sheet sheet forming the cylindrical casing from being unenclosed." It has the same purpose.

In the construction method of the invention method according to claim 1 (see FIG. 1), a method of constructing a cylindrical casing (FIG. 1E) by placing a large number of sheet piles (1a to 1j),
a. Using a ruler (Fig. (A), (B)) installed on the ground, the sheet piles (1a, 1c) are driven every other line (Fig. (C)),
b. Remove the ruler (Fig. (D)),
c. A sheet pile (1b) is driven by fitting a sheet pile joint between sheet piles (1a, 1c) driven every other.
According to the invention method of the first aspect described above, since a large number of sheet piles to be driven are positioned with a ruler every other one, they are driven without accumulating dimensional errors occurring in the joint portion, and are driven first. There is no risk of incoherence between the sheet pile and the last sheet pile to be driven.

The invention method according to claim 2 is an improvement of the method of claim 1 (FIG. 1) (see FIG. 5). The same rulers (FIG. 5 (A)) and (B) as above are installed on the ground. And
a. Using the above-mentioned ruler, the shape and dimension guide temporary sheet piles (8a to 8i) obtained by cutting the sheet pile 1 to be permanently cut are driven (FIG. 5 (C)),
b. Remove the ruler above,
c. With the guide sheet pile, a temporary casing having a smaller installation depth than the real one is formed (FIG. 5 (D),
d. One temporary sheet pile 8 is extracted from the temporary casing (arrow f in FIG. 5 (E)),
e. After the extracted one sheet pile 8, the sheet pile 1 to be permanently placed is driven by using the sheet piles on both sides that have not yet been extracted as guides (FIG. 5 (E), arrow g), and this operation is sequentially repeated. Thus, a cylindrical casing made of the permanent sheet pile 1 is completed (FIG. 5F).
According to the invention method of the second aspect described above, since a large number of sheet piles to be permanently placed are guided by the guide temporary sheet pile longer than the ruler, the same effect as in the first aspect can be obtained. Moreover, the perpendicularity of the driven sheet pile is excellent.

In the invention according to claim 3, in addition to the constituent elements of the method of the invention of claim 1 (see FIG. 6), when the sheet pile (1a, 1c) to be permanently placed is driven by a sheet pile jig as a ruler, Without driving in to the full depth, keep the driving depth to a fraction (∠ / n) (Fig. 6 (A))
Using the portion driven to a depth of a fraction of the above as a guide, one sheet pile 1h is driven further deeply, and this operation is repeated sequentially to drive the entire length (∠) into the ground to Completed (FIG. 6C). However, it is also possible to leave a part of the total length of the sheet pile on the ground to be in a “state in which casing columns are planted”.
According to the invention of the third aspect described above, it is not necessary to use the guide sheet pile as in the second aspect, and the verticality comparable to that when the guide sheet pile is used can be obtained.

The structure of the invention method according to claim 4 is that, in addition to the constituent elements of any one of claims 1 to 3, a ground auger is swallowed in advance in each of the placement positions of a large number of sheet piles, Without removing the earth auger, the ground surface is leveled.
According to the method of the invention of claim 4 described above, the ground is dug and loosened, so it is not only easy to drive a sheet pile, but also the area excavated with an earth auger is stirred and homogenized. As a result, the sheet pile that is driven into it has little deviation in verticality.

The configuration of the inventive method according to claim 5 has the same or similar cross-sectional shape as the above-mentioned multiple sheet piles to be driven, in addition to the constituent features of the inventive method of the above-described first to fourth embodiments. Configure a sheet pile-shaped jig shorter than the sheet pile,
The ruler is configured by intermittently arranging the sheet-like jigs along the closed curve,
And assuming a state in which a large number of sheet piles are driven along the closed curve, a rubber sheet for the guide is arranged so as to be in contact with this virtual sheet pile,
The ruler is constituted by the sheet-shaped jig and the rubber plate.
According to the invention method of claim 5 described above, since the clearance of the jointed sheet pile is elastically packed by the rubber plate, noise and vibration pollution due to pile driving work can be prevented.

The configuration of the inventive method according to claim 6 is in addition to the constituent features of the inventive method of claims 1 to 5, when driving the multiple sheet piles,
Assuming a plane g passing through the center of gravity G of the sheet pile and parallel to the longitudinal direction of the sheet pile,
The chuck of the pile driver grips “a plurality of locations where the sheet pile intersects the plane g”.
According to the above-described method of the invention of claim 6, the action line of the driving force applied to the sheet pile and the action line of the penetration resistance force received by the sheet pile from the ground substantially coincide with each other, and a couple is generated by the above two forces. Therefore, it is easy to drive the sheet pile straight.
Since the penetration resistance varies depending on the ground condition, it is difficult to assume this in advance. However, the experience and knowledge accumulated by the inventors and the experimental study show that the action line of this penetration resistance is Such an effect is obtained by using the fact that it passes through the vicinity of the center of gravity.

The configuration of the cylindrical casing driving ruler according to the invention of claim 7 is a ruler for configuring a cylindrical casing by driving N sheet piles along a closed curve established on the ground,
It has the same or similar cross-sectional shape as the sheet pile, and has N / 2 pieces of sheet pile jigs that are much shorter than the sheet pile (but rounded down or rounded up if not divisible),
And assuming a state where N sheet piles are arranged in a cylindrical shape along the closed curve,
The virtual sheet pile arranged in a cylindrical shape is replaced with the sheet pile jig every other line, and the sheet pile jig is intermittently arranged along the closed curve. .
According to the invention of the seventh aspect described above, about half of the sheet pile jigs to be driven are arranged so as to form a cylinder every other one. By placing the sheet piles one by one between the sheet pile-shaped jigs, the sheet piles are disposed in an accurate cylindrical shape to form a cylindrical casing.
Thus, since it is positioned every other piece, even if a large number of sheet piles are driven, there is no possibility that dimensional errors due to the fitting of the joint portions will be accumulated and a large non-closure will occur.

In addition to the structural requirements of the invention of claim 7, the configuration of the cylindrical casing driving ruler according to the invention of claim 8 is about the N virtual sheet piles arranged in the cylinder,
An outer frame having an N-shaped inner peripheral surface in contact with each sheet pile;
An inner frame having an N-shaped outer peripheral surface in contact with each sheet pile,
In addition, each of the N-side N-sides of the inner peripheral surface and the N-side N-sides of the outer peripheral surface are substantially parallel to each other, and there is one between the parallel sides facing each other. A space for guiding through the sheet pile is formed.
According to the invention of claim 8 described above, since the base portion of the ruler is divided into the outer frame and the inner frame, the work of transportation and installation is easy.
In addition, a space is formed between the inner periphery of the outer frame and the outer periphery of the inner frame that gently fits outside the `` horizontal cross-sectional shape of the cylindrical casing to be configured '', so a number of sheet piles are sequentially It is convenient to form a desired cylindrical shape.

The configuration of the invention according to claim 9 is in addition to the configuration requirements of the invention of claim 8,
The above-mentioned jig for sheet pile is attached with “the leg spanned between the parallel opposing sides”,
The above-mentioned legs are attached to the outer frame and the inner frame so as to be bridged and easily attached and detached.
According to the invention of claim 9 described above, the sheet pile jig is easily attached to and detached from the outer frame and the inner frame, so this is supported while supplying the sheet piles to be placed one by one. Thus, the sheet pile jigs can be removed one by one. For this reason, the invention method of Claim 1 or Claim 2 can be implemented easily, and the effect can fully be exhibited.

In the configuration of the invention according to claim 10, in addition to the configuration requirements of the invention according to claim 8 or claim 9, the sheet pile to be driven is positioned at each position where the parallel sides face each other. A rubber plate to be guided or a plate-like member covered with rubber is arranged and fixed to the outer frame or the inner frame.
According to the invention of claim 10 described above, since the sheet pile to be placed is elastically positioned and guided by the rubber plate, noise pollution and vibration pollution due to the clearance of the joint portion can be reduced. .

The gripping tool for driving the cylindrical casing according to claim 11 is a sheet pile gripping tool (chuck for pile punching machine) used in combination with the ruler for driving the cylindrical casing described in claim 7. And
For each of the N sheet piles, assuming a plane g passing through the center of gravity G of the sheet pile and parallel to the longitudinal direction of the sheet pile,
It is a structure that simultaneously holds a plurality of locations near the upper end of the line of intersection between the sheet pile and the plane g.
According to the eleventh aspect of the invention described above, the line of action of the driving force applied to the sheet pile passes through the vicinity of the center of gravity of the sheet pile and is parallel to the longitudinal direction of the sheet pile.
On the other hand, the line of penetration resistance force that the sheet pile receives from the ground also passes through the vicinity of the center of gravity and is parallel to the longitudinal direction. As a result of integrating these phenomena, applying this claim 11
Since the action line of the driving force applied to the pile coincides with the action line of the penetration resistance force that the pile receives from the ground, the above two forces do not cause a couple. As a result, it is effective for maintaining the perpendicularity of the driven sheet pile.

According to the method of the invention of claim 1, a plurality of sheet piles to be driven are rulers (sheet pile jigs) every other line, and the dimensional error generated in the joint portion is not accumulated, There will be no incompatibility with the last sheet pile to be driven.
According to the method of the invention of claim 2, since many sheet piles to be permanently placed are guided by the provisional sheet pile for guide longer than the ruler, the same effect as in claim 1 can be obtained and The perpendicularity of the made sheet pile is excellent.

According to the invention of the third aspect described above, it is not necessary to use the guide sheet pile as in the second aspect, and the verticality comparable to that when the guide sheet pile is used can be obtained.
According to the method of the invention of claim 4, since the ground is dug and loosened, not only is it easy to drive the sheet pile, but also the area excavated by the earth auger is stirred and homogenized, so that The sheet piles that are driven into it have little vertical deviation.

According to the invention method of claim 5, since the clearance of the joint portion of the sheet pile fitted together is elastically packed by the rubber plate, noise and vibration pollution due to pile driving work can be prevented.
According to the method of the invention of claim 6, the action line of the driving force applied to the sheet pile and the action line of the penetration resistance force received by the sheet pile from the ground substantially coincide, and no couple is generated by the two forces. It becomes easy to drive the sheet pile straight.
Since the penetration resistance varies depending on the ground condition, it is difficult to assume this in advance. However, the experience and knowledge accumulated by the inventors and the experimental study show that the action line of this penetration resistance is Such an effect is obtained by using the fact that it passes through the vicinity of the center of gravity.

According to the invention of claim 7, since about half the sheet pile jigs of the many sheet piles to be placed are arranged so as to form a cylinder every other one, these alternate sheet pile shapes are arranged. By placing the sheet piles one by one between the tools, the sheet piles are placed in an accurate cylindrical shape and the cylindrical casing is formed.
Thus, since it is positioned every other piece, even if a large number of sheet piles are driven, there is no possibility that dimensional errors due to the fitting of the joint portions will be accumulated and a large non-closure will occur.

According to the invention of claim 8, since the base portion of the ruler is divided into the outer frame and the inner frame, the transportation and installation work is easy.
In addition, a space is formed between the inner periphery of the outer frame and the outer periphery of the inner frame that gently fits outside the `` horizontal cross-sectional shape of the cylindrical casing to be configured '', so a number of sheet piles are sequentially It is convenient to form a desired cylindrical shape.
According to the invention of claim 9, since the sheet pile jig is easily attached to and detached from the outer frame and the inner frame, while supplying the sheet piles to be placed one by one, One jig can be removed at a time. For this reason, the invention method of Claim 1 or Claim 2 can be implemented easily, and the effect can fully be exhibited.

According to the invention of claim 10, since the sheet pile to be placed is elastically positioned and guided by the rubber plate, noise pollution and vibration pollution due to the clearance of the joint portion can be reduced.
According to the invention of claim 11, the line of action of the driving force applied to the sheet pile passes through the vicinity of the center of gravity of the sheet pile and is parallel to the longitudinal direction of the sheet pile.
On the other hand, the line of penetration resistance force that the sheet pile receives from the ground also passes through the vicinity of the center of gravity and is parallel to the longitudinal direction. As a result of integrating these phenomena, applying this claim 11
Since the action line of the driving force applied to the pile coincides with the action line of the penetration resistance force that the pile receives from the ground, the above two forces do not cause a couple. As a result, it is effective for maintaining the perpendicularity of the driven sheet pile.

FIG. 1 is a process diagram schematically illustrating an embodiment in which a cylindrical casing is constructed by applying the present invention.
FIG. 1E shows a constructed cylindrical casing, and ten sheet piles 1a to 1j are assembled by fitting joints to each other.
In FIGS. 1A and 1B, the main part of the ruler is extracted and drawn. The overall structure of this ruler will be described in detail later with reference to FIGS. 2 to 4, but the sheet pile-shaped jigs 3 a to 3 e are arranged along a closed curve (circle S in this example) formulated on the ground surface. Yes.
The number of sheet pile jigs is half the number of sheet piles to be placed. Therefore, it is desirable that the design of the cylindrical casing is set so as to be composed of an even number of sheet piles. However, when placing odd-numbered sheet piles for some reason, the number of sheet pile-shaped jigs may be about half of the sheet piles.
Half of the sheet pile jigs are arranged every other one as shown in FIGS. 1 (A) and 1 (B). (Alternatively, the expression "alternately" is not necessarily accurate, but please understand it in conjunction with the explanation in the next figure (C)).

(See FIG. 1C) A joint is fitted between two sheet pile jigs 3a and 3e, and a sheet pile 1c is inserted and driven into the ground. In this figure, the first sheet pile 1a has already been driven between the sheet pile jig 3e and 3a.
The sheet pile jigs 3e, 3a, 3b are arranged every other space so that the same sheet piles 1a, 1c can be inserted between them.
When half of the sheet piles are driven as shown in FIG. 1C, the sheet pile jigs 3a to 3e are removed. As a result, as shown in FIG. 1D, half of the sheet piles are placed every other one.
A joint is fitted between the sheet piles 1a and 1c that are placed every other line, and the sheet pile 1b is driven (arrow c). The remaining sheet piles are driven in order and finished as shown in FIG.
When viewed in comparison with FIG. 1E, in FIG. 1D, every other sheet pile is arranged. Since this sheet pile and the sheet pile jig have the same plane figure, the expression that the sheet pile jigs 3a to 3e shown in FIGS. I want you to understand.
In the example of FIG. 1, the sheet piles are arranged along the circle s. However, when carrying out the present invention, they may be arranged along an ellipse or a rounded square, in other words, along a closed curve. Just arrange.

In FIG. 1 described above, in order to simplify the drawing, only the sheet pile jigs 3a to 3e, which are the main parts of the ruler, are drawn and drawn, but in actuality, these sheet pile jigs are positioned and supported. A structure is required.
FIG. 4 is an assembly drawing of a ruler. This ruler is configured by mounting the “set jig having a sheet pile jig” shown in FIG. 3 on the base member shown in FIG. Hereinafter, this will be described in sequence.
The base member shown in FIG. 2 includes an outer frame 4 and an inner frame 5.
A circle S drawn with a chain line is a closed curve designed to place N sheet piles. In this example, N = 10.
Therefore, the outer frame 4 is formed with an N-sided (decagonal) inner periphery 4a that gently circumscribes the circle S that is the hit design drawing line. The above-mentioned gradual means having an appropriate clearance.
Similarly, the inner frame 5 has a decagonal outer periphery 5a.
The N-gon does not need to be a geometrically strict regular N-gon, and may be a shape similar to this.
The sides of the decagonal inner periphery 4a and the sides of the decagonal outer periphery 5a are parallel to each other, and spaces between which the sheet pile can be inserted are formed, and the inserted sheet pile is elastic. Rubber plates 4a and 5a are provided so as to be positioned at the positions.
(Note) The state where the sheet pile is inserted is illustrated in FIG. 4 to be described later, but the state where the rubber plate is installed is easier to understand in FIG.
In the present embodiment, a rubber-coated steel plate is used as the rubber plate, and the rubber plate is attached to the decagonal inner periphery 4a and the decagonal outer periphery 5a facing in parallel. These rubber plates are hatched for convenience of reading.

FIG. 3 shows the sheet pile jig 3 shown as the main component part of the ruler in FIG. This sheet pile jig 3 is attached to a bridging leg 7 to constitute a set jig 6. Said bridge | crosslinking form means that it bridge | crosses between the outer frame demonstrated in above-mentioned FIG. 2, and it describes in detail later with reference to FIG.
The sheet pile jig 3 of this example was configured by cutting a sheet pile of the same standard as the sheet pile to be placed. As is clear from the structure and operation shown in FIG. 1 described above, a necessary function for the arrow-shaped jig 3 is a pair of joints 2. Therefore, even if it looks different from the sheet pile, the member having the pair of joints 2 has a shape similar to the sheet pile in the present invention (corresponding to claim 7).
FIG. 3A is a perspective view, and FIG. 3B is a plan view, and a bridging leg 7 is provided with a mounting bolt hole 7a. The cc cross-sectional arrow view is shown in (C), and the arrow d direction external view is shown in (D). Reference numeral 7b is a reinforcing rib.

FIG. 4 is an assembly drawing of a ruler, where (A) is a plan view and (B) is a side view.
When FIG. 4A is compared with FIG. 1A described above, it is the same that five sheet pile jigs 3a to 3e are arranged every other one.
The vicinity of each of the five sheet pile jigs depicted in FIG. 4A is the same as the plan view shown in FIG. 3B (however, the scale is approximately ½). In order to simplify the drawing, in FIG. 4A, the reference numerals and names of the bridging legs 7 attached to one of the five sheet pile jigs 3d are added. However, only the numeral 7 is written on the other four sheet pile jigs.
The sheet pile jig and the bridging leg are welded and continuously provided. However, the set jig 6 (see FIG. 3) that is integrally welded is attached to the outer frame 4 and the inner frame 5 with bolts and nuts so as to be detachable.
In this way, each of the five sheet pile jigs 3a to 3e is detachable one by one in the process diagram shown in FIG. 1 described above from the process (C) to the process (D). Make the process of going to easy. In the method of the present invention, when “removing the ruler” is used, it is not always necessary to remove the entire ruler, and only the sheet pile jig may be removed.
In this figure, a “ruler whose main component is a sheet pile jig” is drawn with a solid line. In addition, the sheet piles 1a, 1c, 1e, 1g, 1i positioned by this ruler are indicated by imaginary lines.

FIG. 5 is a process diagram for explaining an embodiment different from FIG. 1 described above. Since the scale is smaller than that of FIG. 1, the illustration of the sheet pile joint is simplified and represented by a broken line.
5 (A) and 5 (B) depict the arrangement of sheet pile jigs as in FIG. 1 described above. (F) is a cylindrical casing constructed with ten sheet piles 1.
As described above, driving a sheet pile inserted between five sheet pile-shaped jigs arranged every other piece into the ground is similar to the embodiment of FIG. In the embodiment, as shown in (C), a guide temporary sheet pile that is much shorter than the sheet pile 1 that is permanently placed is driven.
In this example, the length of the permanent sheet pile 1 is 6 m, and the length of the guide temporary sheet pile is 1.5 m. Therefore, the length of the guide temporary sheet pile in this example is 1/4 of the permanent sheet pile 1. When practicing the present invention, it is desirable that the length of the guide temporary sheet pile be about a fraction of the permanent sheet pile.
The above-mentioned permanent sheet pile is a meaning of a sheet pile forming a cylindrical casing which is a construction object, and it does not matter whether the cylindrical casing is disassembled at a later date.

(See FIG. 5C) A guide temporary sheet pile 8b is driven between the sheet pile jigs 3b and 3c as shown by an arrow b. Reference numeral 8a is a guide sheet pile that has already been driven.
When five guide sheet piles for every other guide are driven in this way (not shown), the five sheet pile-shaped jigs are removed one by one, and then the guide sheet piles are driven one after another. .
Thereby, the temporary casing which consists of ten guide temporary sheet piles as shown in (D) figure is formed.
(E) As shown in the figure, one guide temporary sheet pile 8 is extracted (arrow e), and then the permanent sheet pile 1 is driven (arrow f). In this way, when the guide temporary sheet pile is sequentially replaced with the permanent sheet pile, a cylindrical casing as shown in FIG. A chain line GL schematically represents the ground surface.

(C) When the guide sheet piles are driven as shown in the figure, since the guide sheet piles are relatively short, the vertical deviation of the guide sheet piles is small. For this reason, there is no possibility of causing the “non-closing at the lower end of the sheet pile” described with reference to FIG.
(Note) Regardless of whether the lower end part is closed due to the inclination of the sheet pile, or when the lower end part is closed due to the bending of the sheet pile, the "joint gap deviation" is small if it is as short as the guide temporary sheet pile. There will be no settlement stoppage during installation.
(E) When the permanent sheet pile 1 is driven as shown in the figure, the permanent sheet pile 1 is guided by the “guide provisional sheet pile 8 that is clearly longer than the sheet pile jig 3”, so that there is little deviation in verticality. There is no possibility that the lower end of the permanent sheet pile 1 will be closed.

In the embodiment of FIG. 5 described above, the perpendicularity of the permanent sheet pile is ensured by providing a process of forming a “temporary casing made of a guide sheet pile” as shown in FIG.
FIG. 6 is an application example devised so that the same effect can be obtained without using the above-described guide sheet pile.
In FIG. 6A, it is the same as in the embodiment of FIG. 1 described above that “a ruler made of a sheet pile jig” is installed on the ground and permanent sheet piles are driven every other line.
The permanent sheet pile 1a drawn with a chain line is an existing sheet pile, and the permanent sheet pile 1e shown with spots is a sheet pile to be driven.
The existing sheet pile 1a is driven into the ground by ∠ / n with the entire length as the heel. However, n is an arbitrary number of 2 or more, and is not necessarily limited to an integer.
When the five permanent sheet piles are driven in every other manner, the sheet pile jig is removed, and after removing the sheet pile jig, the permanent sheet pile is driven in, as shown in FIG. A temporary cylindrical casing 12 ”having a length dimension of ∠ / n is formed from the lower end of each permanent sheet pile.
One permanent sheet pile 1h out of the ten permanent sheet piles constituting the temporary cylindrical casing is further driven as indicated by an arrow g to complete the cylindrical casing as shown in FIG.

The embodiments described above with reference to FIGS. 1, 5 and 6 are all aimed at “preventing non-closure”.
The prevention of unsealing in the vicinity of the ground surface is completely prevented by using a ruler (sheet pile jig) as shown in FIG. 1, but the unsealing that occurs in the ground at a depth of the ground surface (see FIG. 10). It is not easy to prevent the above).
Therefore, in the embodiment of FIG. 5 and FIG. 6, the temporary casing is configured in the intermediate process to ensure the perpendicularity of the sheet pile so that inconsistency does not occur in the vicinity of the lower end portion of the sheet pile.
Next, two auxiliary means effective for securing the perpendicularity of the sheet pile will be described.

In each of the embodiments shown in FIGS. 1, 5, and 6, prior to setting a ruler on the ground, an earth auger is set up and swallowed at a place where a sheet pile is to be driven. Then, in order to avoid soiling as much as possible, the ground in the area where the sheet pile is planned to be dug and loosened, the earth auger is pulled out, and the ground surface is leveled.
In this way, the earth and sand in the planned space where the sheet pile penetrates is dug and loosened, and the sheet pile becomes easy to penetrate,
Even if there is unevenness in the geology, since it is agitated and becomes nearly uniform, there is no possibility that the perpendicularity of the driven sheet pile will be distorted or the linearity of the sheet pile will be bent.
In this way, incompatibility in the vicinity of the lower end, which is troubled by the misalignment of the driven sheet pile, is prevented.

FIG. 7 is a diagram for explaining another auxiliary means for ensuring the perpendicularity of the driven sheet pile.
For convenience of explanation, FIGS. 7A and 7B show the cause of the vertical deviation of the sheet pile in the prior art, and FIG. 7C shows a structure for eliminating the above cause. . However, the features are exaggerated so as to facilitate understanding of the configuration and operation, and are not realistic projections.
FIG. 7A shows a “cylinder-shaped sheet pile 9 having a vertically-divided cylindrical shape” for forming the “cylindrical casing” shown in FIG. FIG. 7B is a schematic vertical cross-sectional view in a state of being gripped by.
The chuck 10 is mounted on a pile driving machine (not shown), holds the split cylindrical sheet pile 9 and applies pressure input as indicated by an arrow P.

When the split cylindrical sheet pile 9 is press-fitted into the ground, the split cylindrical sheet pile 9 receives the penetration resistance force R.
This penetration resistance is not simple. In summary, it is the resultant force of "the force required to remove the earth and sand applied to the bottom of the sheet pile" and "the frictional force applied to the side surface of the pile".
The line of action of the penetration resistance force R approximately passes through the center of gravity G of the sheet pile.
As a result, as shown in FIG. 7B, the action line of the pressure input P and the action line of the resistance force R do not coincide with each other. Bending the sheet pile.
Therefore, the chuck 11 of this embodiment is configured to grip a wide range of sheet piles.
That is, as shown in FIG. 5C, “assuming a surface gg that passes through the center of gravity G and is parallel to the longitudinal direction of the sheet pile, and this surface gg intersects the split cylindrical sheet pile 9, the same as W1. The split cylindrical sheet pile 9 is held with W2.
For this reason, as in the conventional example shown in FIG. (A), even when one portion V at the center of the split cylindrical sheet pile 9 is gripped, the even line due to the mismatch in the action line between the pressure input and the resistance force. Since no force is generated, it is effective to ensure the verticality and linearity of the sheet pile.
The gripping tool (chuck 11) for placing a sheet pile according to the present invention was created for the purpose of preventing incoherence in placing a cylindrical casing, but when the sheet pile is placed, the sheet pile tilts or bends. In order to prevent this, it is also effective in cases other than casing placement work.
Therefore, even if it is unexpected when placing a cylindrical casing, it is within the technical scope of the present invention to implement the gripping tool according to the present invention in a form that is effective for driving a sheet pile straight. It belongs to.

It is process drawing in one Embodiment of the cylindrical casing placement method concerning this invention. It is 2nd view of the state which showed one Embodiment of the ruler for cylindrical casing driving concerning this invention, and removed the setting jig | tool. It is a single item figure of the set jig removed in above-mentioned FIG. FIG. 4 is a two-side view depicting the assembled state of the embodiment shown in FIG. 2 and FIG. 3 described above. It is process drawing of embodiment different from above-mentioned FIG. It is process drawing of embodiment different from above-mentioned FIG. 1, FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is shown in order to demonstrate the holding tool which concerns on this invention, (A) is a top view of the prior art example drawn for the comparison, (B) is a vertical sectional view of the said prior art example, (C) is this invention. FIG. It is a top view for demonstrating the general structure of a cylindrical casing. It is the typical top view on which the malfunction in the case of placing a cylindrical casing was drawn. When placing a sheet pile, it is a schematic perspective view depicting a state in which the sheet pile tilts or bends.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Permanently placed sheet pile, 1a-1j ... Sheet pile, 2 ... Joint, 3, 3a-3e ... Sheet pile jig, 4 ... Outer frame constituting ruler 4a ... 10-perimeter inner periphery, 4b ... inner peripheral rubber plate, 4c ... mounting bolt hole, 5 ... inner frame constituting ruler, 5a ... 10-perimeter outer periphery, 5b ..Outer peripheral rubber plate, 5c: mounting bolt hole, 6 ... set jig, 7 ... cross-linked leg, 7a ... mounting bolt hole, 7b ... reinforcing rib, 8a-8e ..Guide sheet piles for guides, 9... Sheet piles with a vertically divided cylinder, 10... Chuck, 11.

Claims (11)

In the construction method of constructing a cylindrical casing by driving a number of sheet piles along the closed curve established on the ground and fitting the joints of adjacent sheet piles together,
a. Using a ruler installed on the ground, drive a sheet pile every other line,
b. Remove the ruler above,
c. Fit the sheet pile joint between the existing sheet piles that are driven every other,
A cylindrical casing driving method characterized by driving a sheet pile having substantially the same shape and size as the existing sheet pile. In the method of constructing a cylindrical casing by permanently driving a large number of sheet piles along a closed curve established on the ground and fitting the joints of adjacent sheet piles together,
a. Using a ruler installed on the ground, every other guide sheet pile having a length of a fraction of that of the sheet pile is driven,
b. Remove the ruler above,
c. After removing the ruler, a temporary sheet pile similar to the above is driven in to form a temporary casing whose depth dimension is a fraction of that of a desired cylindrical casing,
d. While pulling out one guide temporary sheet pile forming the above temporary casing,
e. A cylindrical casing driving method characterized by driving the sheet pile to be permanently driven after the extracted guide temporary sheet pile. When every other sheet pile is driven in the step a, the sheet pile is driven to a depth of a fraction of the installation depth of the cylindrical casing that is the purpose of placing,
After removing the ruler in the process of the item b, when driving the sheet pile in the process of the item c, by keeping the driving depth dimension to a fraction,
As an intermediate step, a temporary cylindrical casing having a setting depth of a fraction of that of a cylindrical casing for placement purposes is formed,
2. The cylindrical casing placing method according to claim 1, wherein a number of sheet piles constituting the temporary tubular casing are sequentially lowered one by one to equalize a desired installation depth. Prior to installing a ruler on the ground in the process of item a,
The earth auger is swallowed into each of the multiple sheet piles to be driven,
Pull out the earth auger almost without earthing,
The cylindrical casing placing method according to any one of claims 1 to 3, wherein the ruler is set by leveling the ground surface dug and loosened by an earth auger. It has the same or similar cross-sectional shape as the multiple sheet piles to be driven, and constitutes a sheet pile-shaped jig shorter than the multiple sheet piles,
The ruler is configured by intermittently arranging the sheet-like jigs along the closed curve,
And assuming a state in which a large number of sheet piles are driven along the closed curve, a rubber sheet for the guide is arranged so as to be in contact with this virtual sheet pile,
The cylindrical casing placing method according to any one of claims 1 to 4, wherein the ruler is constituted by a sheet-shaped jig and a rubber plate. When driving the multiple sheet piles,
Assuming a plane g passing through the center of gravity G of the sheet pile and parallel to the longitudinal direction of the sheet pile,
The cylindrical casing placing method according to any one of claims 1 to 5, wherein "a plurality of locations where the sheet pile intersects the plane g" is gripped by a chuck of a pile driving machine. A ruler for constructing a cylindrical casing by driving N sheet piles along a closed curve established on the ground,
It has the same or similar cross-sectional shape as the sheet pile, and has N / 2 pieces of sheet pile jigs that are much shorter than the sheet pile (but rounded down or rounded up if not divisible),
And assuming a state where N sheet piles are arranged in a cylindrical shape along the closed curve,
The virtual sheet pile arranged in a cylindrical shape is replaced with the sheet pile jig every other line, and the sheet pile jig is intermittently arranged along the closed curve. A ruler for placing cylindrical casings. About the N virtual sheet piles arranged in the cylindrical shape,
An outer frame having an N-shaped inner peripheral surface in contact with each sheet pile;
An inner frame having an N-shaped outer peripheral surface in contact with each sheet pile,
In addition, each of the N-side N-sides of the inner peripheral surface and the N-side N-sides of the outer peripheral surface are substantially parallel to each other, and there is one between the parallel sides facing each other. A ruler for placing a cylindrical casing according to claim 7, wherein a space for inserting and guiding the sheet pile is formed. To the above-mentioned jig for sheet piles, “the legs spanned on the parallel opposite sides” are attached,
The ruler for driving a cylindrical casing according to claim 8, wherein the leg is bridged between the outer frame and the inner frame and is easily attached and detached.   A rubber plate that positions and guides the sheet pile to be driven or a plate-like member covered with rubber is disposed for each portion where the parallel sides face each other, and is fixed to the outer frame or the inner frame. A ruler for driving a cylindrical casing according to claim 8 or 9, characterized by the above. A gripping tool for a sheet pile used in combination with a ruler for placing a cylindrical casing according to claim 7,
For each of the N sheet piles, assuming a plane g passing through the center of gravity G of the sheet pile and parallel to the longitudinal direction of the sheet pile,
A gripping tool for placing a sheet pile, characterized by having a structure for simultaneously gripping a plurality of locations near the upper end of the line of intersection of the sheet pile and the plane g.

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