JP4409468B2 - Impermeable wall construction equipment - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a water shielding wall construction device used when a vertical water shielding wall having a water shielding sheet (water blocking sheet) as a main element is built in the ground.

  In the final disposal site for industrial waste, etc., it is necessary to surround the final disposal site with a water shielding wall and partition it from the outside in order to prevent the outflow of contaminants. As the water-impervious wall structure, a water-impervious wall construction method using a water-impervious sheet that can ensure simple and high water-tightness has been conventionally employed particularly in the case of ground with high water permeability and ground with low ground strength.

  For example, in the thing of patent document 1, in constructing | assembling the water-impervious wall which has a water-impervious sheet as a main element vertically in the ground, first, the ground is loosened into a groove shape and water is mixed to replace the inside of the groove with muddy water. Then, a water-impervious sheet having a certain width is inserted vertically into the groove replaced by muddy water, and adjacent water-impervious sheets are connected to each other through a joint member.

Moreover, in the thing of patent document 2, on the assumption that a water-impervious sheet is inserted in the groove | channel replaced with muddy water like the above, the sheet roll which wound the water-impervious sheet beforehand in roll shape is used as the said groove | channel. A water-impervious wall is constructed by inserting the water-impervious sheet from the sheet roll while unwinding it vertically and then unfolding it.
Japanese Patent Publication No. 4-33325 JP 2002-38466 A

  In the former technique, the width dimension of the water-impervious sheet that can be inserted into the groove in a vertical posture is naturally limited, so what is the work of inserting the water-impervious sheet into the groove and connecting adjacent water-impervious sheets? It must be repeated several times, and in particular, the cost is increased due to an increase in man-hours.

  On the other hand, the latter technique is a system in which the water shielding sheet is drawn out from a sheet roll previously wound in a roll shape and deployed in the groove, and a certain workability improvement effect can be expected as compared with the former technique. . However, since the sheet roll is inserted into the groove alone and directly in the groove prior to drawing out and unfolding the water-impervious sheet, considering the buckling of the sheet roll, the insertion depth of the sheet roll can be applied. The depth of the impermeable wall is naturally limited. In addition, the pull-in posts are simultaneously inserted at a position away from the sheet roll insertion position by a predetermined distance, and a wire is stretched between the sheet roll and the pull-in post in advance, and the wire rolls are shielded from the sheet roll. Since the water sheet is pulled out and pulled out toward the pull-in post side, there is a problem that the equipment configuration becomes complicated as the number of man-hours increases.

  The present invention has been made paying attention to such a problem, and on the premise of using a sheet roll in which a water shielding sheet is wound in advance in a roll shape, the sheet roll is further deepened while having a simple structure. Therefore, a water shielding wall construction device capable of constructing a water shielding wall having a large depth can be provided.

  In the invention according to claim 1, the sheet roll formed by winding the water-impervious sheet around the core material in a roll shape penetrates into the ground, and after fixing one end of the water-impervious sheet, the water-impervious sheet is removed from the sheet roll. It is assumed that this is a device for constructing a water-impervious wall in the ground by unwinding and deploying.

In addition, a roll penetration post for penetrating the sheet roll into the ground is mounted on the leader mast of the penetrating mother machine with self-propelled capability so that the lower end of the sheet roll can be rotated. a lower support means for supporting the, is provided with an upper support means for supporting the upper end portion of the sheet roll individually, the upper support means, rotation-tolerant gripping portion for rotatably supporting the sheet roll and rotating the sheet roll And a non-rotatable gripping portion that is unsupportably supported .

Specifically, as described in claim 2, said lower support means is a sheet having a function of rotatably bearing supporting the core material in the receiving member which is formed protruding from the roll penetration mast It is desirable for stably supporting the roll.

  More specifically, the lower support means, as described in claim 3, is configured such that the lower end of the core member and the bearing member are engaged with each other so that the core member can be rotatably supported.

  Desirably, as described in claim 4, the rotation-supporting gripping portion of the upper support means has bearing member gripping means for gripping the bearing member that rotatably supports the core material, and the non-rotatable gripping portion is Each core material is formed by core material gripping means that directly grips the core material in a non-rotatable manner, and the rotation-permissible-type grip portion and the non-rotatable-type grip portion can be selectively used.

  The rotation-permissible-type gripping part and the non-rotatable-type gripping part forming the upper support means can be gripped and released by an actuator-driven gripper arm as described in claim 5. This is desirable for operational stability.

  In addition, on the ground where the impermeable wall is to be constructed, the raw soil is excavated into a groove shape at the current position, while water or cement milk is added, mixed and stirred, and fluidized into a so-called muddy water. It is desirable to keep it. Further, as the water shielding sheet, for example, a high density polyethylene sheet having a thickness of about several millimeters is used.

Even if the sheet roll is in the form of a roll around which a water shielding sheet is wound, its length is finite, so in order to connect the water shielding sheets developed in the ground to each other, for example, a sheet roll is formed. It is desirable that a joint member capable of engaging with the concave and convex portions is provided at both ends in the winding direction of the water shielding sheet.

Further, it is desirable that the roll penetrating post can be attached to and detached from the leader mast when adjusting the length of the leader mast and the roll penetrating post.

More preferably, for example, the roll penetrating post includes a lower post to which a lower support means is attached, an upper post to which an upper support means is attached, and a single or a plurality of intermediate posts interposed between the lower and upper posts. Are detachably connected.

Furthermore, in order to maintain the verticality of the sheet roll penetrating into the ground, it is desirable to mount an inclinometer capable of measuring the verticality of the roll penetration post, for example .

  Therefore, in the invention according to at least claim 1, since the sheet roll does not penetrate into the ground alone, but the sheet roll penetrates into the ground together with the rigid roll penetration post supporting the sheet roll. It is possible to penetrate the sheet roll deep into the ground. In that case, when it is necessary to connect with the existing water-impervious sheet, they are connected to each other with the uneven engagement between the joint members described above.

  If the sheet roll penetrates into the ground together with the roll penetration post, the winding end of the water-impervious sheet is fixed by uneven engagement between the joint members, and the sheet is used by using the self-propelled ability of the penetration mother machine. Move the roll in the ground. Then, the water shielding sheet is pulled out from the sheet roll so as to be gradually rewound autonomously and developed into a curtain shape, and thus a water shielding wall having the water shielding sheet as a main element is constructed in the ground. It will be.

  According to the invention described in claim 1, since the sheet roll formed by winding the water-impervious sheet in a roll shape is penetrated into the ground together with the roll penetration post supporting the sheet roll, the sheet roll can be penetrated deep into the ground. This is possible, and it becomes possible to further increase the depth of the impermeable wall constituted by the impermeable sheet.

  In addition, once the sheet roll has penetrated into the ground, the impermeable sheet can be deployed in a curtain shape simply by moving the sheet roll laterally using the self-propelled ability of the penetrating mother machine. There is an advantage that the structure is simple and the number of man-hours for construction can be remarkably reduced.

  First, an outline of the construction method will be described before explaining the details of the impermeable wall construction apparatus of the present invention.

  Here, as shown in FIGS. 1 and 2, use a sheet roll 1 in which a tough water-impervious sheet having a predetermined width (for example, a high-density polyethylene sheet having a thickness of several millimeters) S is wound in a roll shape in advance. As a premise, a female joint 2 which is rigid as a joint member on the winding start end side of the water-impervious sheet (hereinafter simply referred to as “sheet”) S and has a substantially C-shape in plan view, A round bar-shaped male joint 3 is fixed in advance as a joint member on the winding end portion side of the sheet S over the entire width thereof, and the water shielding sheet S is wound around the female joint 2 as a core material. The joint between the female joint 2 or the male joint 3 and the sheet S is, for example, wrapped in a bag shape at the end of the sheet S while using the female joint 2 or the male joint 3 together with an adhesive, and then joined to the welded part Sw. And welded.

  If these female joint 2 and male joint 3 are arranged on the same axis and are moved relative to each other, so-called uneven fitting is performed, and in that state, it is easily detached only by applying a tensile force in the radial direction. It has a structure that does not. As described above, the sheet roll 1 uses the female joint 2 on the winding start end side as a core member, and winds the sheet S to a predetermined length having the male joint 3 on the winding end end side. Consists of.

  On the ground where the impermeable wall should be constructed, the raw soil is excavated in a groove shape in advance at the current position, while water or cement milk etc. is added and mixed and stirred to fluidize so-called muddy water. It is desirable.

  More specifically, as shown in the plan view of FIG. 3, the ground on which the impermeable wall W is to be constructed is excavated in a groove shape at the current position to loosen the soil while water or cement milk or the like. In addition, it is mixed and stirred and fluidized in a so-called muddy water form to form the groove-like fluidized layer 4.

  Next, as shown in FIG. 6A, the female joint 2 has the same structure as the above-described structure in the groove-like fluidized layer 4 and at the position to be the construction start portion (starting end portion) of the water shielding wall W. A rigid substantially C-shaped anchor post 5 is inserted and fixed in a vertical posture.

  If the anchor post 5 is fixed so as not to move, the sheet roll 1 is penetrated in the vertical position in the vicinity thereof. At that time, as shown in FIG. 3B, the male joint 3 on the winding end side of the sheet S forming the sheet roll 1 is fitted into the anchor post 5 so that the sheet roll 1 is inserted. When finished, the sheet roll 1 itself is moved along the longitudinal direction of the groove-like fluidized layer 4 as shown in FIG. By doing so, the sheet S forming the sheet roll 1 is gradually rewound so as to be pulled out, and finally developed into a curtain shape in the groove-like fluidized layer 4. That is, in the grooved fluidized layer 4, a sheet S having one end as the male joint 3 and the other end as the female joint 2 extends.

  When the development of one sheet roll 1 is completed in this way, the male on the second sheet roll 1 side with respect to the female joint 2 attached to the existing sheet S as shown in FIG. The second sheet roll 1 is penetrated into the groove-like fluidized layer 4 in the same manner as described above while fitting the joint 3 to the concave and convex portions.

  And as shown in the figure (E), the second sheet roll 1 is developed as a sheet S while moving in the groove-like fluidized layer 4, and thereafter the above operation is repeated, The sheets S, S... Are successively added using the length of the sheet S for one sheet roll as a unit element to form a water shielding sheet layer having a predetermined length in the grooved fluidized layer 4. become. In particular, when cement milk is added to the grooved fluidized layer 4 in advance, by obtaining a predetermined curing period, the grooved fluidized layer 4 itself in which the sheets S, S. Since the sheet is solidified, a three-layer water-impervious wall W having a so-called sandwich structure is constructed with the sheets S, S.

  FIG. 4 shows an overall schematic structure of the impermeable wall construction device that controls the penetration of the sheet roll 1 into the ground and its development, and FIG. 4A shows a side view thereof. FIG. (B) shows a front view.

  This impermeable wall construction device is constituted by a crawler-type pile driving machine having a self-propelling ability as an intrusion mother machine (base machine) 6, and an upright posture (vertical posture) by a boom 7 and a catch fork 8. An elevating base 10 is attached to the leader mast 9 supported by the elevating base 10, and a prismatic roll penetrating post 11 is detachably connected to the elevating base 10, for example. The roll penetrating post 11 can be press-fitted into the ground and pulled out by the function of the penetrating mother machine 6 itself, that is, the function of moving the lifting base 10 up and down hydraulically (static pressure) along the leader mast 9. It has become. 5A shows a state where the roll penetrating post 11 is press-fitted into the ground from the state of FIG. 4A, and FIG. 5B shows the roll penetrating post similarly from the state of FIG. 4B. 11 shows a state in which 11 is pressed into the ground.

  FIG. 6 shows details of the roll penetrating post 11 in FIG. 4 (B), in which a lower post 12 and an upper post 13 each having a prismatic shape and an intermediate post 14 interposed between them are connected by bolts and nuts. The length of the roll penetrating post 11 can be adjusted by, for example, replacing the intermediate post 14 with one having a different length, or adding another intermediate post 14. ing.

  As shown in FIG. 7 in addition to FIG. 6, a mounting flange 16 is welded and fixed to the upper end of the roll penetrating post 11 (upper post 13), and the roll penetrating post 11 is interposed via the mounting flange 16 and the mounting bracket 17. While being connected to the elevating base 10 on the leader mast 9 side, the lower end portion of the roll penetrating post 11 is slidably guided and supported by a slide guide portion 17 on the leader mast 9 side as shown in FIGS. . The roll penetrating post 11 is stably supported in such a form that the sheet roll 1 described above is juxtaposed in an upright posture as described later.

  Further, as shown in FIGS. 7 and 8 in addition to FIG. 6, the lower post 12 forming the roll penetrating post 11 is provided with a lower gripping mechanism 18 as a lower support means. An upper gripping mechanism 19 is mounted on the formed upper post 13 as an upper support means.

  As shown in FIGS. 8 and 9, the lower gripping mechanism 18 includes a plate-shaped roll receiving bracket 20 as a receiving member that is bolted and nut-coupled so as to protrude from the lower post 12 in the horizontal direction, and a positioning pin 21 as a bearing member. Is fitted upward with a pin hole 22 with a bottom plate 22a at the lower end on the female joint 2 side that functions as the core of the sheet roll 1, so that at least the lower end of the sheet roll 1 is rotatably supported by a bearing. It is possible.

  On the other hand, as shown in FIG. 10 in addition to FIG. 6, the upper gripping mechanism 19 includes a gripper mechanism 24 and two upper and lower stages extending horizontally with respect to a common base plate 23 coupled to the upper post 13 by bolts and nuts. 25. Both of these gripper mechanisms 24 and 25 have a function of gripping the upper part of the sheet roll 1 to be supported by the roll penetrating post 11, but the upper gripper mechanism 24 is a sheet roll. The lower gripper mechanism 25 functions as a non-rotatable gripping portion that supports the sheet roll 1 in a non-rotatable manner, and functions as an upper and lower side. The gripper mechanisms 24 and 25 can be selected and used alternatively.

  Here, as apparent from FIG. 1, the female joint 2 that functions as a core material is directly supported by the positioning pin 21 at the lower end of the sheet roll 1, but the female that functions as the core material at the upper end of the sheet roll 1. The joint 2 is not directly supported, and the extension rod 26 is connected to the upper end of the female joint 2 in a relatively non-rotatable and detachable manner, and then the gripper mechanism 24 or 25 is indirectly used with the extension rod 26 as a grip portion. In support of. A ball bearing unit 27 as a bearing member is disposed at the upper end of the extension rod 26.

  The upper gripper mechanism 24 functions as a bearing member gripping means for gripping the ball bearing unit 27 that is a bearing member. As shown in FIG. 11 in addition to FIG. 10, the upper gripper mechanism 24 has two upper and lower stages projecting horizontally from the base plate 23. A single movable side gripper arm 29 having a substantially bowl shape is rotatably connected by a hinge pin 30 between the fixed side gripper arms 28, 28, and one end of the movable side gripper arm 29 and the roll penetrating post 11 are connected to each other. A clevis type gripper cylinder (hydraulic cylinder) 31 is disposed between them. That is, the cylinder tube 32 of the gripper cylinder 31 is connected to the roll penetrating post 11 so as to be swingable, and the piston rod 33 is connected to the movable gripper arm 29. Accordingly, the movable side gripper arm 29 swings to grip or release the ball bearing unit 27 on the extension rod 26 described above.

  More specifically, as is clear from FIG. 6, the height position of the upper gripper mechanism 24 is the position of the ball bearing unit 27 of the sheet roll 1 to be supported by the roll penetrating post 11, that is, as the core material of the sheet roll 1. It is matched with the height position of the ball bearing unit 27 on the extension rod 26 to be connected to the functioning female joint 2, and the stationary gripper arm 28 is in contact with the outer peripheral surface of the ball bearing unit 27. Since the surface 28a is formed, the sheet roll 1 is held by gripping the outer periphery of the ball bearing unit 27 with the upper gripper mechanism 24 composed of the fixed gripper arm 28 and the movable gripper arm 29 as shown in FIG. The upper end of the bearing can be supported rotatably. To have.

  On the other hand, the lower gripper mechanism 25 functions as a core material gripping means for directly gripping the extension rod 26 that functions as a part of the core material together with the female joint 2, and as shown in FIG. 12 in addition to FIG. A single movable side gripper arm 35 having a substantially bowl shape is rotatably connected by a hinge pin 36 between two upper and lower fixed side gripper arms 34, 34 projecting horizontally from 23. The movable side gripper arm A clevis-type gripper cylinder (hydraulic cylinder) 37 is disposed between one end of 35 and the roll penetrating post 11 as described above. Therefore, the movable gripper arm 35 swings in response to the expansion / contraction operation of the gripper cylinder 37, and directly holds the extension rod 26 directly below the ball bearing unit 27, that is, the extension rod 26 itself. Will be released.

  More specifically, as is clear from FIG. 6, the height position of the lower gripper mechanism 25 is the ball on the extension rod 26 to be connected to the female joint 2 that functions as the core of the sheet roll 1. Since the bearing unit 27 is set at a position lower than the height position, and the stationary gripper arm 34 is formed with a receiving surface 34a that contacts the outer peripheral surface of the extension rod 26, as shown in FIG. By directly gripping the extension rod 26 with the upper gripper mechanism 25 composed of the fixed side gripper arm 34 and the movable side gripper arm 35, the upper end of the sheet roll 1 can be supported while being non-rotatably restricted. ing.

  Note that these upper and lower gripper mechanisms 24 and 25 do not grip each other at the same time, and either one selectively grips.

  In addition, as shown in FIGS. 6, 9, and 10, inclinometers 38 and 39 are arranged at two places on the upper and lower sides of the roll penetration post 11, for example, on the monitor screen installed in the cabin of the penetration mother machine 6. The vertical degree of the post 11 can be visually confirmed in real time.

  Next, the construction procedure of the water shielding sheet by the water shielding wall construction apparatus configured as described above will be described.

  As shown in FIG. 3, prior to the penetration of the seat row 1, the ground where the impermeable wall W is to be constructed is excavated in a groove shape at the current position to loosen the soil while water or cement milk is used. As described above, the groove-like fluidized layer 4 is formed in advance by mixing and stirring to fluidize it in the so-called muddy water state.

  First, the penetrating mother machine 6 is moved to the vicinity of the position where the construction start part (starting end part) of the impermeable wall W is supposed to be in the state of FIG. That is, when the roll penetrating post 11 is not penetrated as shown in FIG. 4, the sheet roll 1 is set to the roll penetrating post 11 as shown in FIG. More specifically, the extension rod 26 is connected to the upper end of the female joint 2 that functions as the core material of the sheet roll 1 shown in FIG. 9 is fitted to the positioning pin 21 on the roll receiving bracket 20 which is the lower gripping mechanism 18 shown in FIG. 9, while the extension rod 26 on the upper end side of the sheet roll 1 is the lower gripping mechanism 19 as shown in FIG. The gripper mechanism 25 on the side grips directly. However, at this time, the upper gripper mechanism 24 that also constitutes the upper gripping mechanism 19 is in a released state so as not to function as a gripping mechanism.

  As described above, the sheet roll 1 is supported so as to be parallel and upright along the roll penetrating post 11, and is maintained in a self-standing posture on the substantially horizontal roll receiving bracket 20.

  Next, as shown in FIG. 3A and FIG. 13, it is the same as the female joint 2 at a position in the groove-like fluidized layer 4 and to be a construction start portion (starting end portion) of the impermeable wall W. The shaped anchor post 5 is inserted and fixed. 3B and FIG. 14, the male joint 3 on the winding end portion side of the sheet roll 1 supported on the roll penetrating post 11 side with respect to the anchor post 5 (see FIG. 1). And the roll penetration post 11 is gradually penetrated together with the sheet roll 1 using the original press fitting function of the penetration mother machine 6. In the process of penetration of the sheet roll 1, the penetration resistance is received by the roll receiving bracket 18 at the lower end of the roll penetration post 11, while the sheet roll 1 is restrained so as not to rotate by the lower gripper mechanism 25 shown in FIG. 12. Therefore, the sheet S is not rewound from the sheet roll 1 due to the penetration resistance or the like, and the slack is not generated.

  If the sheet roll 1 has penetrated to a predetermined depth, the subsequent penetration operation is stopped, and the sheet roll 1 is held at the depth position. Further, the upper and lower gripper mechanisms 24 and 25 forming the upper gripping mechanism 19 are moved to hold the sheet roll 1, and the upper gripper mechanism 24 shown in FIG. The ball bearing unit 27 on the extension rod 26 is gripped by 28 and 29, and the lower gripper mechanism 25 in FIG. 12 which has gripped the extension rod 26 until then is released. As a result, the sheet roll 1 is released from the restraint by the lower gripper mechanism 25 until then, and can be rotated by the bearing support by the upper gripper mechanism 24 and the ball bearing unit 27 in addition to the bearing support by the roll receiving bracket 18. Will be supported.

  Thereafter, the penetration mother machine 6 is caused to self-run, and the sheet roll 1 is moved along the longitudinal direction of the groove-like fluidized layer 4 together with the roll penetration post 11. Then, as shown in FIG. 3C and FIG. 14, the sheet S forming the sheet roll 1 is gradually rewound so as to be pulled out, and finally in the groove-like fluidized layer 4. It expands like a curtain. That is, in the grooved fluidized layer 4, a sheet S having one end as the male joint 3 and the other end as the female joint 2 extends. The extended state of the sheet S is held by the pressure of the fluidized material in the groove-like fluidized layer 4. Further, in the process of penetration or deployment of the sheet roll 1 as described above, the vertical degree of the roll penetration post 11 is monitored while viewing the monitor screens of the inclinometers 38 and 39 as appropriate, so that it becomes vertical according to the degree. The operator corrects it.

  When the development of one sheet roll 1 is completed in this manner, the gripping of the ball bearing unit 27 by the upper gripper mechanism 24 up to that point is released, and the female attached to the end of the sheet S just developed is released. For example, an operator removes the extension rod 26 from the joint 2. The removed extension rod 26 is reused.

  In this state, as shown in FIG. 9, the fitting state between the positioning pin 21 on the roll receiving bracket 18 attached to the lower end of the roll penetrating post 11 and the pin hole 22 at the lower end of the female joint 2 is released. The roll penetrating post 11 is lowered by the stroke to be obtained, and a predetermined amount (in a plan view, until the roll receiving bracket 18 is detached from the position of the female joint 2) in the direction of separating the roll penetrating post 11 from the female joint 2, together with the penetrating mother machine 6 After the roll penetration post 11 is moved, the roll penetration post 11 is pulled out to the ground as shown in FIG. Thereby, the fitting state of the positioning pin 21 and the pin hole 22 so far is released, and the female joint 2 is separated from the roll penetrating post 11 and left in the groove-like fluidized layer 4.

  In this way, if the roll penetrating post 11 is pulled up to the original position, a new sheet roll 1 is set again on the roll penetrating post 11 as shown in FIG. The process proceeds to penetration of the first sheet roll 1. At this time, the sheet roll 1 is penetrated into the groove-like fluidized layer 4 together with the roll penetration post 11 while fitting the male joint 3 on the sheet roll 1 side with the existing female joint 2. Similarly, the sheet S is pulled out and developed from the second sheet roll 1 (see FIG. 3E). Thereafter, the above-described series of penetration and unfolding operations are repeated for the third and fourth sheet rolls 1, and the unfolded sheets S and S are joined each time, so that the groove-like fluidized layer 4 is formed. A long impermeable sheet layer is formed inside.

  Thereafter, when cement milk is added in advance into the groove-like fluidized layer 4, the groove-like fluidized layer 4 itself in which the sheet S extends is solidified by obtaining a predetermined curing period. Therefore, the water-impervious wall W having a substantially three-layered sandwich structure with the sheet S as a main element is constructed.

  Here, as the structure of the lower gripping mechanism 18 in FIG. 9, the bottom plate 22 a shown in FIG. 9 is abolished, and instead, as shown in FIG. 16, the flange plate 40 at the lower end of the sheet roll 1 and the roll receiving bracket 20 A sliding bearing member 41 may be interposed therebetween.

  Thus, according to the construction apparatus of the present embodiment, it is possible to construct the impermeable wall W having a greater depth while having a simple structure as compared with the conventional apparatus.

The disassembled perspective view of the sheet roll used by embodiment of this invention. Plane explanatory drawing of the sheet roll shown in FIG. Schematic explanatory drawing which shows the construction procedure of the impermeable wall using the sheet | seat roll of FIG. It is a figure which shows schematic structure of a construction apparatus as preferable embodiment of this invention, (A) is side explanatory drawing, (B) is front explanatory drawing. It is a figure which shows the state which penetrated the roll penetration post into the ground from the state of FIG. 4, (A) is side explanatory drawing, (B) is front explanatory drawing. Explanatory explanatory drawing of the roll penetration post shown in FIG. FIG. The expanded sectional view which follows the BB line of FIG. The lower part expanded sectional view of FIG. The upper expansion explanatory drawing of FIG. FIG. 11 is an explanatory plan view of the upper gripper mechanism shown in FIG. 10. FIG. 11 is an explanatory plan view of the lower gripper mechanism shown in FIG. 10. Explanatory drawing of the construction procedure centering on the movement of the penetration mother machine. Explanatory drawing of the construction procedure following FIG. Explanatory drawing of the construction procedure following FIG. It is a figure which shows the modification of FIG. 9, and the lower part expanded sectional view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Sheet roll 2 ... Female joint (joint member) as a core material
3 ... Male joint (joint member)
4 ... Grooved fluidized layer 5 ... Anchor post 6 ... Penetration mother machine (pile driver)
DESCRIPTION OF SYMBOLS 9 ... Leader mast 10 ... Elevating base 11 ... Roll penetration post 12 ... Lower post 13 Upper post 14 ... Intermediate post 18 ... Lower gripping mechanism (lower support means)
19: Upper gripping mechanism (upper support means)
20 ... Roll receiving bracket (receiving member)
21 ... Positioning pin as a bearing member 22 ... Pin hole 24 ... Upper gripper mechanism (rotation permitting type gripping part) as a bearing member gripping means
25: Lower gripper mechanism (non-rotatable gripping part) as core material gripping means
26 ... Extension rod 27 ... Ball bearing unit (bearing member)
28 ... Gripper arm on the fixed side 29 ... Gripper arm on the movable side 31 ... Gripper cylinder (actuator)
34 ... fixed side gripper arm 35 ... movable side gripper arm 37 ... gripper cylinder (actuator)
38 ... Inclinometer 39 ... Inclinometer S ... Water shielding sheet W ... Water shielding wall

Claims (5)

A sheet roll formed by winding a water shielding sheet around the core material in a roll shape penetrates into the ground, and after fixing one end of the water shielding sheet, the water shielding sheet is unwound from the sheet roll and expanded to the ground. An apparatus for constructing a water shielding wall,
The leader mast of the penetrating mother machine with self-propelled ability is equipped with a roll penetrating post for penetrating the sheet roll into the ground so that it can move up and down,
The roll penetration post is individually provided with a lower support means for rotatably supporting the lower end portion of the sheet roll and an upper support means for supporting the upper end portion of the sheet roll ,
The upper support means includes a rotation-permissible gripping portion that rotatably supports the sheet roll and a non-rotatable gripping portion that supports the sheet roll in a non-rotatable manner. Lower support means, water shield wall construction according to claim 1, characterized in that has a function of rotatably bearing supporting the core material in the receiving member which is formed protruding from the roll penetration mast.   The water-impervious wall construction device according to claim 2, wherein the lower support means supports the bearing so that the lower end of the core and the bearing member are engaged with each other in a concave-convex manner so that the core can rotate. The rotation support type gripping part of the upper support means has a bearing member gripping means for gripping the bearing member that rotatably supports the core material, and the non-rotatable gripping part grips the core material directly so as not to rotate. Each with means,
The impermeable wall construction device according to any one of claims 1 to 3, wherein the rotation-allowing-type gripping part and the non-rotatable-type gripping part can be selectively used.   The rotation-allowing-type gripping part and the non-rotatable-type gripping part forming the upper support means can be gripped and released by an actuator-driven gripper arm. Impermeable wall construction equipment.

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