JP4814968B2 - Rational arrangement method of sheet pile - Google Patents

Description

  This invention is a rational arrangement of a seat pile for constructing a retaining wall in the ground using a seat pile so that the surroundings of the underground excavation portion do not collapse when excavating the ground in civil engineering or construction work. Concerning construction method.

  Conventionally, in order to construct a retaining wall in the ground, a parent pile using H-shaped steel is driven at a predetermined interval, and a horizontal retaining sheet is sequentially fitted between adjacent parent piles to construct a retaining wall. There is a sheet pile method and a sheet pile method that constructs a retaining wall by continuously placing sheet piles (steel sheet piles). In particular, the latter sheet pile method is used in any excavation section with the same design conditions. In addition, a sheet pile having the same cross-sectional shape is used, and this pile is placed in a continuous arrangement, and the retaining wall is constructed so that the penetration depth below the bottom of the excavation is constant. .

  However, since the stress acting on the retaining wall fluctuates in the depth direction, the strength is naturally excessive at the part where the stress is low, and the conventional sheet pile construction method is excessively designed. There is a problem of high costs.

  Therefore, in the construction of the retaining wall, the present invention reduces the usage amount of the sheet pile and reduces the construction cost by arranging the optimum sheet pile corresponding to the stress and deformation in the depth direction of the wall body. An object of the present invention is to provide a rational arrangement method of sheet piles that can be performed.

  In order to solve the above-described problems, the invention of claim 1 is a sheet pile construction method for constructing a mountain retaining wall by driving a sheet pile into the ground in a lateral connection. Constructing a retaining wall by installing a sheet pile with a longer penetration depth from the bottom of the excavation and a sheet pile with a shorter penetration depth depending on the stress, deformation in the vertical direction and the ground conditions It is what you do.

  The invention according to claim 2 is a sheet pile construction method for constructing a retaining wall by laterally driving a sheet pile into the ground, wherein the sheet pile driven into the ground is subjected to stress and deformation in the depth direction of the retaining wall and the ground condition. Accordingly, a mixture of different cross-sectional shapes is used.

  According to a third aspect of the present invention, a mountain retaining wall is constructed by combining the sheet pile labor-saving method of the invention of the first aspect and the sheet pile labor-saving method of the second aspect of the invention.

  In the invention of claim 4, when sheet piles having different lengths are driven by an auger combined press-fitting machine, the sheet pile is fixed to the casing with an upper end fixed by a chuck, and a lower end part is engaged in the driving direction, It is combined and driven by an attachment mechanism that is detached in the pulling direction.

  The invention of claim 5 is a press-fitted sheet pile that ensures the reaction force of the press-fitting machine in order to maintain the center line in the connecting direction of the sheet pile when the sheet pile having a different cross-sectional shape is constructed by a hydraulic press-fitting machine. A press plate is temporarily fixed to the inside or outside of the upper end of the press to prevent the movement of the axis of the press-fitting machine and press-fit.

  Here, when the plan method for rationally arranging the sheet piles is roughly divided, if there is no groundwater, there is groundwater, and when the rooting length is determined by the balance of earth pressure, the rooting length is determined by heaving. There are four types of cases where it is necessary to extend the length, and it is necessary to extend the length by boilering. The length and cross-sectional width of the sheet pile to be used can be reduced in accordance with each case. A retaining wall is constructed by selecting the size or combining the selection of the sheet pile rooting length and the cross-sectional width size.

  According to this invention, according to the stress and deformation in the depth direction of the retaining wall to be constructed and the ground conditions, the sheet pile having a longer root penetration length from the bottom of the excavation, and the sheet having a shorter root penetration length Since piles were mixed, the sheet pile with a long rooting length became a stress bearing material, and the sheet pile with a short rooting length became a horizontal sheet pile for the main pile horizontal sheet pile method, which required a retaining wall. The stress bearing material to be used can be shortened while maintaining the strength to be achieved, and the construction cost can be reduced by reducing the amount of sheet pile used.

  In addition, in the construction of the retaining wall, by using a mixture of sheet piles having different cross-sectional widths, it becomes possible to use sheet piles having a narrow cross-sectional width, and to reduce the cost of the sheet pile to be used. Further reduction in construction cost can be realized by combining sheet piles having different insertion lengths and different cross-sectional widths.

  Furthermore, when sheet piles of different lengths are driven with an auger combined press, the sheet pile can be easily fixed to the casing, the sheet pile can be driven efficiently, and sheet piles with different cross-sectional shapes can be When installing with a hydraulic press machine, if the center line of the connection direction of the sheet pile is maintained, the movement of the press machine can be reduced as much as possible, and sheet piles with different cross-sectional shapes can be placed efficiently. be able to.

It is a labor-saving pattern figure using the same sheet pile of the rational arrangement method of the sheet pile which constructs a retaining wall, (a) is the front view of the conventional retaining wall shown as a contrast, (b) is two sheets of sheet pile 1 is a front view of a retaining wall with a sheet pile used as a pile pile, and the sheet pile used in place of a horizontal sheet pile is shortened. (C) is a sheet pile of 1 sheet pile. A front view of a retaining wall with a shorter root pile length used instead of a sheet pile It is a labor-saving pattern diagram using the same sheet pile of the rational arrangement method of the sheet pile that constructs the retaining wall. (A) is used as a pile pile sheet pile for two of the three sheet piles, Front view of the retaining wall with the sheet pile used being extremely shortened, (b) is the sheet pile used as a base pile for one of the two sheet piles. Front view of the retaining wall with an extremely short length, (c) is a mountain retaining with the sheet pile used in place of a horizontal sheet pile as the main pile sheet pile, one of the three sheet piles. Front view of the wall It is a labor-saving pattern diagram using a sheet pile with a different cross-sectional shape of the rational arrangement method of the sheet pile for constructing the retaining wall, and (a) is used instead of one parent pile portion sheet pile and two cross-sheet piles. Front view of mountain retaining wall consisting of a combination of sheet piles, with equal rooting lengths, (b) is one of the two piles of sheet piles, and the pile pile is used instead of a side pile. Front view of a retaining wall with a shortened length, (c) is a front view of a retaining wall with a shortened base pile length for a sheet pile used as a pile pile for one of three sheet piles. Figure It is a labor-saving pattern diagram using sheet piles with different cross-sectional shapes in the rational arrangement method of sheet piles that construct a retaining wall, (a) is two sheets of piles instead of three pile pile sheet piles and side sheet piles Front view of a mountain retaining wall consisting of a combination of sheet piles, with the sheet piles that can be used instead of horizontal sheet piles being extremely shortened, (b) is two sheets used instead of two pile pile sheets and horizontal sheet piles A front view of a mountain retaining wall consisting of a combination of sheet piles, with two sheet piles that can be used instead of cross-sheet piles, with an extremely short root length, (c) is the parent pile. Front view of a mountain retaining wall with an extremely short sheet pile base length used as a sheet pile instead of a side sheet pile It is a labor-saving pattern diagram using sheet piles with different cross-sectional shapes for the rational arrangement method of sheet piles to construct a retaining wall, (a) is an alternate combination of a pile pile sheet pile and a sheet pile instead of a side sheet pile The front view of the retaining wall with the same rooting length, (b) consists of a combination of two master pile sheet piles and one sheet pile used instead of a side sheet pile. The front view of the equal retaining wall, (c) is a combination of one pile pile and two sheet piles instead of the side piles. Front view of long and short mountain retaining walls It is a labor-saving pattern diagram using sheet piles with different cross-sectional shapes in the rational arrangement method of sheet piles for constructing a retaining wall. (A) is one of three sheet piles as a main pile sheet pile. Front view of a mountain retaining wall with a shortened rooting length using a sheet pie with a different cross-sectional shape for a sheet pile used instead of a sheet pile, (b) shows three sheets used for a pile pile and a sheet pile instead of a side sheet pile Front view of a mountain retaining wall made of a combination of piles, with the root pile length of the sheet pile used in place of the horizontal sheet piles being extremely shortened, (c) is instead of the two pile pile sheet piles and the two horizontal sheet piles Front view of a mountain retaining wall consisting of a combination of sheet piles to be used, with the sheet piles used in place of the side sheet piles being extremely short. Perspective view showing the concept of earth pressure working width in the parent pile sheet pile method (A) is a cross-sectional plan view at the excavation part showing the concept of the earth pressure working width in the main pile cross-sheet pile method, (b) is a cross-sectional plan view at the same insertion part The perspective view which shows the concept of the working width of the earth pressure in the rational arrangement construction method of the sheet pile of this invention (A) is a cross-sectional plan view at the excavation part showing the concept of the earth pressure working width in the main pile cross-sheet pile method, (b) is a cross-sectional plan view at the same insertion part The perspective view which shows the concept of the working width of the earth pressure in the rational arrangement construction method of the sheet pile of this invention (A) is a cross-sectional plan view at the excavation part showing the concept of the earth pressure working width in the main pile cross-sheet pile method, (b) is a cross-sectional plan view at the same insertion part Explanatory drawing which shows the normal heaving examination method for determining the penetration length of the sheet pile which does not save labor instead of the main pile (A) is a conceptual diagram for explaining the hollowing out of the soil in the case of a parabolic cylinder of the Protojaknov method, (b) is a sectional view Conceptual diagram of soil hollowing out using trial wedge model Conceptual diagram showing the deterrent effect of non-labor-saving sheet pile instead of parent pile The distance between the center line of the retaining wall and the back side of the sheet pile and the excavation side is shown, (a) is a plan view showing the arrangement of the normal sheet pile, and (b) is the type of sheet pile on the back side and excavation side (C) is a plan view when the types of sheet piles are different on the back side, and (d) is a plan view of the retaining wall when different types of sheet piles are combined on the back side and excavation side. The top view which shows the state which uses a patch plate in order to make a center line and the axis of a press machine correspond, (e) is the case where the kind of sheet pile is different on the back side and the excavation side, and the center line of the retaining wall and the press machine FIG. 5F is a plan view showing a state in which the contact plate is used to match the axis, and FIG. 5F is a view showing a state where the center line of the retaining wall is aligned with the axis of the press-fitting machine when the type of the sheet pile is different on the back side. State to use Plan view illustrating the The relationship between the type of combination of sheet piles to be press-fitted and press-fitting machines and the example of the placement of the contact plate are shown specifically. (A) is a type III sheet in a combination where sheet piles alternate between type III and type IV. Plan view during press-fitting pile, (b) Plan view during press-fitting IV type sheet pile (A) is a plan view at the time of the first construction in which a sheet pile is press-fitted with a type III sheet pile when the sheet pile is a combination of type III, type III, type IV, type III, type III, type IV, and FIG. Plan view at the time of second construction to press-fit the sheet pile, (c) is a plan view at the time of construction to press-fit the IV type sheet pile (A) is a side view for carrying out a method for installing sheet piles having different lengths without moving the chuck according to the present invention, and (b) is a side view in which an attachment mechanism is enlarged. (A) is a side view for carrying out a conventional method for building sheet piles having different lengths by moving the chuck, and (b) is a cross-sectional plan view of the chuck portion.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  The rational arrangement method (labor saving work method) of the seat pile of this invention uses a sheet pile (steel sheet pile) instead of the parent pile sheet pile method when excavating underground in civil engineering and construction work, and excavating underground It is for building a retaining wall in the ground so that the surroundings of the part do not collapse.

  In the rational arrangement method of the seat pile of this invention, the sheet pile driven into the ground is a sheet having a deeper root penetration depth from the bottom of the excavation according to the stress and deformation in the depth direction of the retaining wall and the ground condition. A method of installing a pile and a sheet pile with a shorter root insertion length, and a method of using a mixture of different cross-sectional widths depending on the stress and deformation in the depth direction of the retaining wall and the ground conditions The construction of the actual retaining wall is the optimum method according to the stress and deformation in the depth direction of the wall body, the groundwater level and the ground condition. Adopt construction method.

  When building a retaining wall using a sheet pile, there are the following four types of planning methods for rationally arranging the sheet pile according to the groundwater level and ground conditions.

  (1) When there is no groundwater: Although the groundwater level is deeper than the bottom of the excavation, the strength of the ground at the excavation part or the basement part is low, so the sheet pile construction method is adopted instead of the main pile side sheet pile construction method.

  (2) When there is groundwater and the penetration length is determined by the balance of earth pressure: The groundwater level is shallower than the bottom of the excavation, so that the tip is rooted in the impermeable layer for the purpose of water shielding This is determined by examining the balance of earth pressure).

  (3) When it is necessary to extend the rooting length by heaving: Since the rooting ground is soft and viscous soil, it is necessary to extend the rooting length beyond the length determined by the balance of earth pressure by examining the heaving. If there is.

  (4) When it is necessary to extend the penetration length by boiling: The groundwater level is shallower than the bottom of excavation, the ground is ground and the appropriate impermeable layer does not exist. When the length needs to be extended beyond the length determined by the balance of earth pressure.

  Next, the rationalization method for each plan type of (1) to (4) described above will be specifically described with reference to the labor saving pattern of the sheet pile of FIGS.

(1) When there is no groundwater When the strength of the ground of the excavation part or the rooting part is low, in the conceptual diagram of the conventional parent pile horizontal sheet pile method shown in FIGS. 7 and 8, instead of the parent pile 1 and the horizontal sheet pile 2 As shown in the conceptual diagrams of FIGS. 1 to 6 and FIGS. 9 to 12, in the present invention, the main pile portion sheet pile 1a, the sheet pile 1b used in place of the horizontal sheet pile having the same shape as the sheet pile 1a, and the above-mentioned A pile retaining wall is constructed by using a main pile portion sheet pile 1c having a different cross-sectional shape from the sheet pile 1a, and a sheet pile 1d used in place of the horizontal sheet pile having the same shape as the sheet pile 1c.

  FIG. 7 shows the relationship between the active earth pressure and the passive earth pressure in the conventional parent pile sheet pile method, and the active width of the main pile 1 depends on the soil quality of the pierced part, and the operating width of the excavation area main earth pressure is shown in FIG. It corresponds to the parent pile pitch as shown in (a), and the working width of the rooting portion main earth pressure is 2 to 3 times the width (B) of the parent pile as shown in FIG.

  Based on this idea, in the present invention, the active width of one sheet pile is also regarded as two to three sheet piles, and the combination of the sheet pile 1a used as the parent pile material and the sheet pile 1b used instead of the lateral sheet pile is used. As shown in FIG. 9, the working width of the excavation part main earth pressure is twice the master pile sheet pile width (B) as shown in FIG. The working width of the pressure is approximately twice the sheet pile width (B) as shown in FIG.

  When adopting 2 times as the passive width, one sheet is regarded as the main pile part pile 1a and inserted to a depth where earth pressure is balanced. In addition, since the other is a sheet pile 1b used instead of the horizontal sheet pile, part or all of the insertion into the deeper than the excavation bottom can be omitted as shown in FIG.

  Similarly, when adopting 3 times the passive width, as shown in FIG. 11 and FIG. 12, by omitting part or all of the insertion into the deeper than the bottom of the excavation bottom of the three sheets of the sheet pile, It is possible to save labor as the sheet pile 1b used instead of the sheet pile.

  At this time, when the strength or rigidity of the sheet pile 1a that is considered to be a parent pile portion and does not save labor is insufficient due to the examination of the cross-sectional stress and the deflection, the following method is used.

1) A member having a large cross-sectional performance is applied to the sheet pile 1a.
2) Continuing the sheet pile 1a, the master pile sheet pile shown in FIG.
3) The desired performance is ensured by combining the two.

  In addition, if the rooting length of the sheet pile 1b to be labor-saving is ½ or more of the rooting length obtained from the earth pressure balance calculation, the labor-saving sheet pile can be regarded as a stress bearing material.

  Therefore, it can be handled as a continuous wall. However, it should be noted that the earth pressure action widths of the excavation part and the base part are all continuous.

(2) When there is groundwater and the penetration depth is determined only by the balance of earth pressure Even when the impermeable layer is distributed near the bottom of the excavation or near the middle of the penetration depth, The sheet pile can be saved on the basis of the same idea as the case where there is no sheet pile. However, the sheet pile 1b for labor saving needs to penetrate into the water shielding layer.

(3) When it is necessary to extend the penetration length by heaving In this case, the ground below the bottom of the excavation is mainly composed of a soft, viscous ground (also a water-impervious layer). As a cross-section when saving labor, the base pile length of the non-labile sheet pile 1a instead of the main pile is determined based on the normal heaving examination method shown in FIG. 13, and the labor saving sheet pile 1b is also blocked. It is necessary to penetrate the water layer.

  Furthermore, in the method of FIG. 14 or FIG. 15, the safety of the hollowing out of the portion of the labor-saving portion is saved as in the method of FIG. 16 to bear the sliding resistance as a restraining pile on the arc slip surface within the labor-saving range. By evaluating the bending strength and the passive resistance deeper than the sliding surface of the sheet pile that does not change, the labor-saving length of the sheet pile 1b is ensured.

  In the case where the ground of the sheet pile is soft and viscous soil, or when the length of the root pile is extended due to consideration of heaving, there is a possibility that an earth drop phenomenon may occur between the labor-saving sheet piles. If the soil dropout phenomenon occurs locally, the plasticization region spreads around the ground with creep deformation, which may lead to slip failure of the entire mountain retaining wall. It is desirable to ensure safety.

  Here, FIGS. 14A and 14B are diagrams showing the safety of the hollowing out of the soil in the portion to be labor-saving. It shows the concept (in the case of the Paratocylinder of Proto-Jakonov method).

  The safety regarding the hollow of the soil in FIG. 15 is evaluated by the following method.

  As shown in the conceptual diagram of the soil void determination by the trial wedge model shown in FIG. 15, the void soil mass is simplified to a wedge model in which the labor saving width is one side of a rectangular cross section and the bottom surface is inclined.

  The depth H of the rectangular cross section is equivalent to the upper surface of the parabolic cylinder of the protojakonov method shown in FIG. 14, and the bottom surface inclination angle α is the average internal friction angle Φ of the examination range or the ratio of the examination length l to the depth H. Decide more.

  With respect to this mass, if the resultant force of the acting earth pressure and the horizontal component of the sliding resistance is 1.2 times or more of the horizontal component of the sliding force, it is determined that there is no risk of the hollowing out of the soil. This examination is repeatedly calculated at an appropriate position of the sheet pile depth, and the labor saving length is confirmed.

<Deterrence effect of sheet pile without labor saving>
The deterrent effect by the sheet pile that does not save labor is calculated at an appropriate position of the depth of the sheet pile, as in the case of the determination of the hollowing out of the soil. Furthermore, as shown in FIG. 16, on the arc sliding surface at each examination position, the combined force of the soil shear resistance and the sheet pile deterrent pile resistance can ensure 1.2 times or more of the sliding force of the soil mass. Check that.

(4) When it is necessary to extend the rooting length by boiling In this case, the rooting length cannot be saved, but the section of the member of the sheet pile to be used is saved. For example, as shown in FIG. 3 or FIG. 5, the IV type sheet pile 1a and the III type sheet pile 1c having a smaller member cross section than the IV type sheet pile 1a are arranged in combination. In addition, the names of the IV type and the III type are attached for convenience.

(4-1) A method of driving sheet piles of different lengths and types with high precision and efficiency, or pulling them out

1) Method of press-fitting different types of sheet piles with a hydraulic press-fitting machine Normally, when a retaining wall is constructed with the same sheet pile, the joint position of the seat pile is as shown in Fig. 17 (a). It is located on the center line in the parallel direction.

  On the other hand, when using sheet piles of different types (cross-sectional shapes) together, as shown in FIGS. 17B and 17C, the distance between the back side of the sheet pile or the excavation side and the center line of the retaining wall Is not constant. Further, when press-fitting a new sheet pile, the support force of the press-fitted sheet pile is used as a reaction force necessary for press-fitting.

  From the above, in order to press-fit different types of sheet piles with high accuracy, it is necessary to match the center line of the retaining wall with the axis of the press-fitting machine. For this purpose, the contact plate 3 is attached to the inside or outside of the upper end of the press-fitted sheet pile that becomes a reaction force, and the center line of the mountain retaining wall is maintained.

  For example, when the III type sheet pile 2b and the IV type sheet pile 2a are alternately press-fitted, when the III type is press-fitted after the IV type, as shown in FIG. 18 is attached to the inner side of the press-fitted IV sheet pile 2a that is the reaction force so that the distance between the pile 2b and the center line of the retaining wall is equal, and the axis (sheet) of the press-fitting machine 4 shown in FIG. (Pile center line = seat pile joint position).

  When the IV type sheet pile 2a is press-fitted after the III type sheet pile 2b, as shown in FIGS. 17E and 17F, the IV type sheet pile 2a to be newly press-fitted and the center line of the retaining wall Affixing plate 3 is attached to the outside of the press-fitted III-type sheet pile 2b, which is the reaction force, so that the distances of the press-fitting machines 4 are equal, and the axis of the press-fitting machine 4 (sheet pile center line = seat pile joint position) is maintained. To do.

  FIG. 18 and FIG. 19 show concretely the relationship between the type of combination of sheet piles to be press-fitted and the press-fitting machine 4, and an example of the arrangement of the contact plate. FIG. 18 shows the sheet piles alternately in the III type and the IV type. FIG. 18 (a) shows a planar state during construction in which the III type sheet pile 2b is press-fitted, and a press plate 3 is attached to the inner surface of the IV type sheet pile 2a previously press-fitted. The IV type sheet pile 2a is clamped and fixed through the plate 3, and the III type sheet pile 2b is press-fitted. Similarly, FIG. 18 (b) shows a planar state during construction in which the IV type sheet pile 2a is press-fitted, A stopper plate 3 is attached to the outer surface of the III-type sheet pile 2b that has been press-fitted before, and the press-fitting machine 4 clamps and fixes the III-type sheet pile 2b via the stopper plate 3 to press-fit the IV-type sheet pile 2a. Both are press-fitting machines It is possible to press-fit with the axis 4 and the center line of the sheet pile aligned.

  FIG. 19 shows a combination of sheet piles III-III-IV-III-III-III-IV, and FIG. 19 (a) shows the first construction in which the III-type sheet pile 2b is press-fitted. A flat plate is shown, and a contact plate 3 is attached to the inner surface of the previously press-fitted IV type sheet pile 2a, and the press-fitting machine 4 clamps and fixes the IV type sheet pile 2a through this contact plate 3, and a III type sheet pile. FIG. 19 (b) shows a planar state at the time of the second construction in which the III type sheet pile 2b is press-fitted, and the contact plate 3 is attached to the inner surface of the IV type sheet pile 2a previously press-fitted. The press-fitting machine 4 clamps and fixes the IV-type sheet pile 2a through the abutting plate 3, and press-fits the III-type sheet pile 2b. FIG. 19 (c) shows that the IV-type sheet pile 2a is press-fitted. The type III sheet pile 2b that has been press-fitted in advance Attaching a backing plate 3 to the outer surface, the press-fitting device 4 clamps the type III sheet pile 2b immobilized through the wear plate 3, press-fitting the type IV sheet pile 2a.

2) When setting up piles of sheet piles of different lengths with an auger press-fitting machine, pile up the piles of sheets of different lengths with sheet piles as an efficient way to build them without moving the chuck that fixes the sheet piles. When constructing walls, an auger combined press-in method may be used depending on the ground conditions.

  Conventionally, as shown in FIGS. 21A and 21B, the auger drive unit 6 and the chuck 7 are independently attached to the leader 5 so as to freely move up and down, and the casing 8 and the inside thereof are attached to the auger drive unit 6. An auger 9 to be rotated is connected, the chuck 7 can be fixed at an arbitrary height position of the casing 8 by tightening a bolt 10, and the upper end of the sheet pile arranged outside the casing 8 is held by the chuck 7. The lower end is fixed to the casing 8 with a mounting plate (not shown), the ground is rotated and dug with an earth auger 9, and a sheet pile is built at the same time.

  Therefore, it is necessary to move the position of the chuck 7 for fixing the sheet pile appropriately every time the length of the sheet pile is different, and the working efficiency is remarkably lowered.

  The following structure is adopted as a method of building sheet piles having different lengths without moving the chuck.

  As shown in FIG. 20 (a), a casing 8 and an auger to be rotated inside are connected to an auger drive 6 attached so as to be movable up and down with respect to the leader 5, and the chuck 7 is connected to the auger drive 6 and the casing. 8 is attached so as to move up and down integrally with the auger drive 6 between the upper ends of the sheet 8, and the upper end of the sheet pile 1a or 1b disposed outside the casing 8 is held by a chuck, and the lower end of the sheet pile 1a or 1b and the casing are As shown in FIG. 20 (b), it is structured to be coupled by an attachment mechanism 11 that engages in the driving direction of the sheet pile and disengages in the pulling direction of the casing.

  The attachment mechanism 11 is formed by fixing a pair of bowl-shaped attachment plates 11a and 11b to the lower end of the sheet pile 1a or 1b and the casing 8, and the casing 8 includes a short sheet pile and a long sheet pile. A mounting plate 11a for use is fixed in the vertical position.

  When building a long sheet pile, the upper end of the sheet pile is held by the chuck 7 and the mounting plate 11b fixed to the lower end of the sheet pile is engaged with the lower end mounting plate 11a of the casing 8 in the driving direction. Therefore, it is arranged and driven outside the casing 8.

  When a short sheet pile is to be built, the mounting plate 11b fixed to the lower end of the sheet pile is fixed to the lower end of the sheet pile with the mounting plate 11a provided in the middle of the casing 8 in the driving direction. By being engaged with, the outer surface of the casing 8 is disposed and driven.

  Therefore, even when a short sheet pile is installed, the upper end thereof is at the same position as that of the long sheet pile, and the position of the sheet pile fixing chuck 7 is set to the casing 8 even if the length of the sheet pile is different. Therefore, it is not necessary to move it, and work efficiency is improved.

  In this case, even when a short sheet pile is built, the drilling length is the same as the length when the long sheet pile is erected (an empty digging occurs), but the sheet pile length is labor-saving. It will be possible.

1a Master pile sheet pile 1b Sheet pile used in place of the horizontal sheet pile
1c Master pile sheet pile (cross-sectional shape different from 1a)
1d Sheet pile used in place of a sheet pile (same cross-sectional shape as 1c)
2a IV type sheet pile 2b III type sheet pile 3 Contact plate 4 Press-fitting machine 5 Leader 6 Auger drive machine 7 Chuck 8 Casing 9 Earth auger 10 Bolt 11 Mounting mechanism

Claims (3)

It is a sheet pile construction method that constructs a mountain retaining wall by driving a sheet pile horizontally into the ground,
Install sheet piles with a deeper depth from the bottom of the excavation at intervals so as to function as a stress bearing material in the horizontal direction,
By installing a sheet pile having a shorter root insertion length from the bottom of the excavation so as to function mainly as a sheet pile between the sheet piles having a longer root insertion length ,
A rational construction method for sheet piles, characterized in that the retaining wall is constructed while maintaining the strength required according to the stress and deformation in the depth direction and the ground conditions. The sheet piles driven into the ground, according to the deformation and ground situation Retaining wall in the depth direction of the stress, to claim 1, characterized in that to construct the earth retaining wall by using a mix of different ones of the cross-sectional width Rational arrangement method of the described sheet pile. When constructing sheet piles with different cross-sectional widths using a hydraulic press machine, the inner or outer side of the upper end of the press-fitted sheet pile that secures the reaction force of the hydraulic press machine to maintain the center line in the connection direction of the seat pile The rational arrangement method of the seat pile according to claim 2, wherein the pressing plate is temporarily fixed to the base plate, and press-fitting is performed while preventing movement of the axis of the hydraulic press-fitting machine.

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