JP4793388B2 - Construction method of joint part of underground wall, underground wall - Google Patents

Construction method of joint part of underground wall, underground wall Download PDF

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Publication number
JP4793388B2
JP4793388B2 JP2008024362A JP2008024362A JP4793388B2 JP 4793388 B2 JP4793388 B2 JP 4793388B2 JP 2008024362 A JP2008024362 A JP 2008024362A JP 2008024362 A JP2008024362 A JP 2008024362A JP 4793388 B2 JP4793388 B2 JP 4793388B2
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underground
water
joint
construction
gap
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JP2009185470A (en
Inventor
淳一 平尾
光男 東野
明夫 稲積
巧 鈴木
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株式会社大林組
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Description

  The present invention relates to a method for constructing a joint portion of an underground wall in which a succeeding element is joined to a preceding element, and an underground wall.

  Conventionally, an underground wall is constructed by constructing a succeeding element in succession to a preceding element. The underground wall constructed by such a method may cause water leakage from the joint between the elements. Therefore, a method (cutting joint method) is used in which unevenness is formed on the surface of the preceding element on the succeeding element side, and the succeeding element is jointed on this surface to improve the water stoppage of the joining surface.

As a construction method of an underground wall in which elements are joined by such a cutting joint method, for example, Patent Document 1 discloses a groove shape in which a tenon groove is formed on an end surface of a preceding element when the preceding element is constructed. A box-shaped member made of steel, a T-shaped steel disposed in the groove of the grooved steel so as to extend in the longitudinal direction, and an ALC plate attached so as to cover the groove of the grooved steel is embedded. A method for constructing the trailing element by cutting and removing the ALC plate when cutting the end face on the trailing element side of the preceding element is described. According to the structure of the joint portion of the underground wall constructed by such a method, since the joint surface is uneven, the entire length thereof becomes long and the water stoppage can be improved.
JP-A 63-125723

  However, in the method described in Patent Document 1, it is necessary to cut and remove the ALC plate when cutting the end surface on the succeeding element side of the preceding element. However, it is difficult to accurately cut only the ALC plate. May remain. Further, when cutting is performed, the inside of the grooved steel is exposed in the excavation groove, so that slime may adhere to the inner surface of the grooved steel. In these cases, a water supply is made on the joint surface of the underground wall, which causes a decrease in water stoppage.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to ensure water-stopping at a joint portion of an underground wall in which a succeeding element is joined to a preceding element.

  The construction method of the joint portion of the underground wall of the present invention is a construction method of the joint portion of the concrete ground wall configured by constructing the succeeding element continuously to the preceding element, A preceding excavation step in which a portion corresponding to the preceding element is excavated to form a excavation groove, and a cavity extending in the longitudinal direction is formed inside, and the end on the trailing element side is cut, thereby opening the cavity. A long gap portion forming member provided with an inflow prevention means for preventing foreign matters from flowing in from the opening portion of the opening extends vertically to the end portion of the excavation groove on the trailing element side. A void forming member installation step, a preceding concrete placing step for placing the concrete constituting the preceding element, and after the placed concrete has hardened, Excavating a portion corresponding to the succeeding element to form an excavation groove, and cutting the end surface on the succeeding element side of the preceding element, and at that time, an end portion on the succeeding element side of the gap forming member is formed. A subsequent excavation step for opening the cavity into the excavation groove by cutting, and a water blocking plate material, a portion of the preceding element side thereof being accommodated in the opened cavity of the gap portion forming member, and A water-stop plate material erection step in which the water-stop means is interposed between the water-stop plate material and the gap portion forming member; And a step.

  In the construction method of the joint portion of the underground wall, the inflow prevention means is a member detachably loaded in the cavity, and the waterstop plate erection step is performed after the member is removed. Alternatively, the inflow prevention means may be a brush provided with a water-repellent liquid provided in the cavity.

Further, the water stop means may be a water stop material having water absorbability that is attached to the water stop plate material. The brush may also function as the water stopping means.
Moreover, the water stop material may be attached to the part embedded in the said succeeding element of the said board | plate material so that it may extend in an up-down direction.

  In addition, the cavity of the gap forming member extends in the wall extending direction of the underground wall and is widened at the leading element side in a state where the cavity is disposed in the excavation groove, The plate material is provided with a widening portion that extends in the wall thickness direction at the end of the preceding element in a state where the plate material is built in the excavation groove, and in the water stop member building step, the water stop plate material is provided with the widening portion. It may be built in such a way that the portion is accommodated in a portion where the cavity of the gap forming member widens.

  Further, a reinforcing bar or a core extending in the vertical direction is embedded in the underground wall, and the gap forming member is attached to the reinforcing bar or the core so as to extend in the vertical direction, In the gap portion forming member arrangement step, the gap portion forming member may be arranged by building the rebar cage or the core material.

  Moreover, the underground wall of the present invention is characterized in that the elements are handed over by the construction method of the joint portion of the ground wall.

  According to the present invention, the portion on the trailing element side of the plate material is embedded in the concrete constituting the trailing element, so that it is possible to prevent water that has entered from the joining surface from flowing around the trailing element side. In addition, since the water stop means attached to the water stop plate material stops water between the water stop plate material and the gap forming member, it is possible to prevent the water that has entered from the joining surface from flowing around the preceding element side, Water can be reliably stopped at the joint.

Hereinafter, an embodiment of a construction method for a joint portion of an underground wall according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a view showing an underground wall 1 in which a succeeding element is handed over to a preceding element by the construction method of the present embodiment, and (A) is a partial view showing the internal structure of the underground wall 1. The front view which removes and shows, (B) is BB 'sectional drawing in (A). As shown in the figure, the underground wall 1 is configured by constructing a succeeding element 20 continuously to the preceding element 10. The preceding element 10 and the succeeding element 20 are respectively concrete 12 and 22 placed in excavation grooves 15 and 25 formed by excavating the ground 3, and each of the concrete 12 and 22 in the wall extending direction. And a plurality of H-shaped steels 11 and 21 embedded at intervals.

  Concavities and convexities (not shown) are formed on the joining surface on the succeeding element 20 side of the preceding element 10, and the preceding element 10 and the succeeding element 20 are joined by a cutting joint method. In addition, a water-stopping steel plate 30 to which a water-absorbing expandable water-stopping material is attached is embedded in the underground wall 1 so as to intersect the joining surface of the leading element 10 and the trailing element 20.

  In the construction method of the joint portion of the underground wall according to the present embodiment, when the preceding element 10 of the underground wall 1 is constructed, a gap forming member 40 having a cavity inside is embedded, and the leading element 10 When cutting the end face, the end of the gap forming member 40 is shaved, the cavity of the gap forming member 40 is opened at the end face, and the gap forming member is accommodated in this cavity from the intermediate part to the preceding element 10 side. After the water-stopping steel plate 30 is built in 40, the trailing element 20 is built.

Hereinafter, the construction method of the underground wall 1 will be described.
2-8 is a figure for demonstrating the construction method of the underground wall 1. As shown in FIG. 2A is a vertical sectional view of the underground wall 1 in the wall extending direction, and FIG. 2B is a vertical sectional view of the underground wall 1 in the wall thickness direction. Moreover, in each figure of FIG. 3, FIG. 4, and FIGS. 6-8, (A) is a vertical sectional view of the wall extension direction of the underground wall 1, (B) is BB 'in (A). It is sectional drawing, (C) is an enlarged view of the C section in (B). 5A is a vertical sectional view in the wall thickness direction of the underground wall 1, FIG. 5B is a vertical sectional view in the wall extending direction of the underground wall 1, and FIG. It is C 'sectional drawing, (D) is an enlarged view of the D section in (C). 2A, FIG. 3, FIG. 4, FIG. 6B to FIG. 8B, FIG. 5C, and FIG.

  First, as shown in FIG. 2, a portion corresponding to the preceding element 10 of the ground 3 is excavated using the excavator 210 lifted by the lifting device 200 to form the excavation groove 15. As the excavator 210, a horizontal multi-axis rotary cutter is preferable because it can simultaneously cut the end face of the preceding element 10 to form irregularities when excavating the ground 3 corresponding to the subsequent element 20 described later.

  Next, as shown in FIG. 3, the H-shaped steel 11 constituting the leading element 10 is built in the excavation groove 15 by the lifting device 200. At this time, as will be described later, the gap forming member 40 is attached in advance to the natural ground side of the H-shaped steel 11 built in the end portion on the trailing element 20 side.

FIG. 9 is a horizontal sectional view of the gap forming member 40 attached to the H-shaped steel 11. The space | gap part formation member 40 consists of a hollow member made from a hard vinyl chloride which has the space | gap 41 extended over the full length in an up-down direction. The gap 41 formed in the gap forming member 40 is provided at the straight part 41B extending in the wall extending direction in a horizontal view in the state of being built in the excavation groove 15, and at the end of the straight part 41B on the preceding element 10 side. The circular portion 41A has a circular shape whose diameter is larger than the width of the straight portion 41B.
As shown in FIG. 3C, the gap forming member 40 is attached to the H-shaped steel 11 by fixing the mounting portion 43 provided on the side thereof to the surface of the H-shaped steel 11 by the flat bar 35. Yes.
When installing in the preceding element 10, the expanded polystyrene 42 is closely fitted to the straight portion 41 </ b> B of the gap forming member 40. Then, the H-shaped steel 11 is built in such a manner that the end portion on the straight portion 41B side of the gap forming member 40 is positioned in the vicinity of the inner peripheral surface on the trailing element 20 side of the excavation groove 15.

  In addition, a spacer 45 made of, for example, a halved polyvinyl chloride pipe or the like is provided at the end of both flanges of the H-shaped steel 11 to which the gap forming member 40 is attached. It is good to attach so that it may protrude to the 20 side. As a result, when the H-shaped steel 11 to which the gap forming member 40 is attached is built, even when the H-shaped steel 11 swings toward the trailing element 20, the spacer 45 is located on the trailing element 20 side of the excavation groove 15. Colliding with the circumferential surface and preventing the gap forming member 40 from colliding can prevent the gap forming member 40 from being deformed or displaced.

Next, as shown in FIG. 4, the tremy tube 220 is inserted between the H-shaped steel 11, and the concrete 12 constituting the preceding element 10 is placed in the excavation groove 15. At this time, the pressure is applied from the placed concrete 12 to the gap forming member 40, but in the portion corresponding to the straight part 41 </ b> B of the gap forming member 40, the foamed polystyrene 42 is fitted in the gap 41, In addition, in the portion corresponding to the outer periphery of the circular portion 41 </ b> A of the gap forming member 40, since this portion is formed in a circular shape, the pressure of the concrete 12 can be resisted. In addition, since the space | gap part formation member 40 is attached to the site | part on the natural ground side of the H-shaped steel 11 as mentioned above, as shown in FIG.4 (C), the space | gap part formation member 40 inserts the tremy tube 210. There will be no obstacles.
And the preceding element 10 is constructed | assembled when this concrete 12 hardens | cures.

  Next, as shown in FIG. 5, a portion corresponding to the succeeding element 20 of the ground 3 is excavated using the excavator 210 lifted by the lifting device 200 to form the excavation groove 25. At this time, at the same time as excavating the ground 3, the end surface of the preceding element 10 on the side of the succeeding element 20 is cut to form irregularities on the end surface of the preceding element 10 on the side of the succeeding element 10. At the same time, the end of the gap forming member 40 on the trailing element 10 side is cut to expose the foamed polystyrene 42 that is closely fitted inside. At this time, since the polystyrene foam 42 is closely fitted in the gap 41 of the gap forming member 40, it is possible to prevent slime from entering the gap forming member 40.

  And after excavation is completed, the polystyrene foam 42 tightly fitted in the straight part 41 of the space | gap part formation member 40 is removed. As a result, the internal space 41 opens into the excavation groove 25.

Next, as shown in FIG. 6, the waterproof steel plate 30 is built so that the portion on the preceding element 10 side from the intermediate portion is accommodated in the gap 41 of the gap forming member 40.
FIG. 10 is a cross-sectional view showing the configuration of the water-stop steel plate 30. As shown in the figure, the still water steel plate 30 is a long member composed of a steel plate 31 and round steels 31A and 31B connected to both horizontal ends of the steel plate 31 so as to extend over the entire length in the vertical direction. Moreover, the water stop materials 32 and 33 which have a water absorptivity expandability are attached to the outer peripheral surface of round steel 31A, 31B which comprises the water stop steel material 30 over the full length of an up-down direction.

  As the water stop material 32, it is preferable that the water stop material 32 expands immediately after the water stop steel plate 30 is built and can secure water stop before placing the concrete 22 of the succeeding element 20. Moreover, if the water stop material 33 expand | swells completely before the completion of placement of the concrete 22 which comprises the later element 20 mentioned later, since the water stop material 33 will not expand at the time of constructing the subsequent element 20. Water stoppage cannot be obtained. For this reason, for example, as shown in the graph of FIG. 11, it is necessary to use a water-stopping material having such a characteristic that even if it is placed in water for about 5 days, it does not expand completely. As such a water stop material, Aquaprene DX (trade name) manufactured by Sanyo Chemical Industries, Ltd. is suitable.

  In installing the still water steel plate 30, the round steel 31B attached to the end of the steel plate 31 is installed from above so that the round steel 31B is accommodated in the circular portion 41A of the gap 41 of the gap forming member 40. The steel 31B is guided by the circular portion 41A, can be built smoothly, and can be held so that the waterproofing steel plate 30 does not move to the excavation hole 25 side. In addition, when the water-stop steel plate 30 has a long vertical length and is difficult to construct, the water-stop steel plate 30 may be divided into a plurality of pieces, and the divided water-stop steel plates 30 may be built while being connected.

  As described above, after cutting the end face of the preceding element 10, the waterproofing steel plate 30 is built, so that slime or the like generated when excavating the end face of the preceding element 10 adheres to the surface of the waterproofing steel material 30. Can be prevented.

  Next, as shown in FIG. 7, H-shaped steel 21 constituting the trailing element 20 is built in the excavation groove 25 at a predetermined interval.

  Next, as shown in FIG. 8, the tremy tube 220 is inserted between the H-shaped steel 21, and the concrete 22 constituting the trailing element 20 is placed in the excavation groove 25. As described above, the water-stop steel plate 30 is built after the formation of the excavation groove 25 and the cutting of the end face of the preceding element 10, so that slime or the like is not attached to the surface, and the trailing element 20 is reliably It can be adhered.

Further, the portion on the preceding element 10 side from the middle portion of the water-stop steel plate 30 is accommodated in the gap forming member 40, and further, since the round steel 31B is accommodated in the circular portion 41A, the water-stop steel plate 30 is held, It is possible to prevent movement due to the casting pressure of the concrete 22.
As the cast concrete 22 hardens, the succeeding element 20 is succeeded to the preceding element 10. The underground wall 1 can be constructed by repeating this operation.

  FIG. 12 is an enlarged view showing a joint portion of the underground wall 1 after the completion of construction. By constructing as described above, as shown in FIG. 12, at the end of the preceding element 10 on the trailing element 20 side, the gap 41 opens to the joining surface F toward the trailing element 20. The gap forming member 40 is embedded. Further, the round steel 31B at one end of the still water steel plate 30 is accommodated in the circular portion 41A of the gap forming member 40, and the portion on the preceding element 10 side from the intermediate portion is the gap 41 of the gap forming member 40. In the accommodated state, it is buried in the underground wall 1 so as to intersect the joint surface F between the preceding element 10 and the succeeding element 20. In addition, slime or the like does not adhere to the surface of the water-stopping steel material 30 in the portion of the water-stopping steel material 30 on the side of the trailing element 20, and the concrete 22 constituting the trailing element 20 adheres to the surroundings. It will be.

  According to such a configuration, the water that has entered the joining surface F from the natural mountain side reaches the waterstop steel plate 30 along the joining surface F. When this water flows along the steel plate 31 constituting the water-stopping steel plate 30 and water enters the preceding element 10 side along the steel plate 31, the water-stopping material attached to the round steel 31B of the water-stopping steel plate 30. 32 absorbs this water and expands. As a result, the water stop material 32 is in close contact with the inner peripheral surface of the gap forming member 40, and the water stop material 32 completely closes between the round steel 31 </ b> B and the gap forming member 40. It is possible to prevent the water that has entered from entering the preceding element 10 side of the water-stop steel plate 30 and leaking to the opposite side of the natural ground.

Further, as described above, since the concrete 22 constituting the trailing element 20 is in close contact with the periphery of the portion on the trailing element 20 side of the water-stopping steel material 30, the portion between the water-stopping steel plate 30 and the concrete 22 is between them. Can prevent water from flowing in. Furthermore, even if water flows between the water-stop steel plate 30 and the concrete 22, the water-stopping material 33 attached to the downstream element 20 side of the water-stop steel plate 30 expands due to this water, Close contact with the concrete 22 to be configured, completely closing the space between the round steel 31A and the concrete 22. This
Water that has entered the joining surface F can be prevented from flowing around the trailing element 20 side of the water-stopping steel plate 30 and leaking, and the joining surface F can be reliably stopped.

  As described above, according to the present embodiment, even when water enters the leading element 10 side along the water-stopping steel plate 30, the water-absorbing and water-stopping material 32 absorbs this water. By expanding and closing the space between the gap forming member 40 and the round steel 31 </ b> B constituting the water-stop steel plate 30, this water can be prevented from leaking to the opposite side of the underground wall 1. Further, since the portion on the downstream element 20 side of the water-stopping steel plate 30 is embedded in the concrete 22 constituting the trailing element 20, water enters between the water-stopping steel plate 30 and the downstream element 20. Can be prevented.

  Further, even if water enters between the water-stopping steel plate 30 and the trailing element 20, the water-absorbing and water-stopping material 33 attached to the end of the water-stopping steel plate 30 expands due to the intruded water, Will be blocked. Thereby, it is possible to prevent water from reaching the opposite side of the underground wall 1 by going around the downstream element 20 side of the water-stopping steel plate 30. As described above, according to the present embodiment, in the underground wall 1 in which the elements 10 and 20 are joined by the cutting joint, it is possible to reliably ensure water-stopping at the joining surface of the elements 10 and 20.

  Moreover, when the foamed polystyrene 42 is fitted into the straight portion 41B of the gap portion forming member 40, when the concrete 22 constituting the trailing element 20 is placed, slime is formed in the gap 41 of the gap portion forming member 40. Inflow can be prevented. Thereby, when placing the trailing element 20, it is possible to prevent water from being generated along the inner surface of the gap forming member 40.

  Further, when the leading element 10 is constructed, the gap forming member 40 is embedded in the leading element 10, and the trailing element 20 of the gap forming member 40 is cut when the joining surface of the leading element 10 is cut. The end portion on the side is shaved, an internal gap 41 is opened in the joint surface, and a part of the waterproof steel plate 30 is accommodated in the gap 41 to ensure that the waterproof steel plate 30 is It can arrange | position so that a joint surface may be crossed.

  In the above embodiment, when the concrete 22 constituting the trailing element 20 is placed, the foamed polystyrene 42 is placed on the straight portion 41B so that the concrete 22 does not flow into the gap 41 of the gap forming member 40. Although not limited to this, as shown in FIG. 13, a brush 142 may be attached to the inner peripheral surface of the straight portion 41 </ b> B, and a water repellent liquid such as grease may be applied to the brush 142. . Also with this configuration, the concrete 22 can be prevented from flowing into the gap 41 of the gap forming member 40. Further, in such a case, when the water-stopping steel plate 30 is disposed in the gap 41 of the gap-forming member 40, the water-stopping property between the water-stopping steel plate 30 and the inner peripheral surface of the gap-forming member 40 is applied with grease. Since it can be ensured by the brush 142 made, the water stop material 32 can be omitted.

Further, in the present embodiment, the waterproof steel plate 30 is composed of the steel plate 31 and the round steels 31A and 31B connected to both ends of the steel plate 31, but the round steels 31A and 31B are not necessarily both sides of the steel plate 31. It is not necessary to connect to at least the end portion on the side accommodated in the gap forming member 40. Further, the connection to the steel plate 31 is not limited to the round steel bar 31 </ b> B. Instead, a member having a wider wall thickness direction than the steel plate 31 may be connected to the steel plate 31. In this case, it is preferable to match the circular portion 41 </ b> A of the gap forming member 40 to the cross-sectional shape of the member connected to the steel plate 31.
Moreover, in this embodiment, although the space | gap part formation member 40 shall consist of hard vinyl chloride, when it can cut with the preceding element 10 not only in this but when cutting the end surface of the preceding element 10, material will be sufficient as it. It doesn't matter.

  In the above embodiment, the case where the present invention is applied to the underground wall 1 in which the elements 10 and 20 in which the H-shaped steels 11 and 21 are embedded in the concrete 12 and 22 is handed over has been described. However, the present invention is not limited to this, and the present invention can also be applied to an underground wall in which an element in which a reinforcing bar is embedded in concrete is handed over. In such a case, when the space | gap part formation member 40 is arrange | positioned, it should just connect with the edge part by the side of the succeeding element of a reinforcing bar, and should arrange | position by building a reinforcing bar.

It is a figure which shows the underground wall constructed | assembled by the construction method of the joint part of this embodiment, (A) is the front view which removed a part in order to show the internal structure of an underground wall, (B) FIG. 2 is a cross-sectional view taken along the line II ′ in FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure (the 1) for demonstrating the construction method of the joint part of the underground wall of this embodiment, (A) is a vertical sectional view of the wall extension direction of an underground wall, (B) is an underground wall. It is a vertical sectional view of the wall thickness direction. It is a figure (the 2) for demonstrating the construction method of the joint part of the underground wall of this embodiment, (A) is a vertical sectional view of the wall extension direction of an underground wall, (B) is the same. It is BB 'sectional drawing in figure (A), (C) is an enlarged view of the C section in the figure (B). It is FIG. (3) for demonstrating the construction method of the joint part of the underground wall of this embodiment, (A) is a vertical sectional view of the wall extension direction of an underground wall, (B) is the same. It is BB 'sectional drawing in figure (A), (C) is an enlarged view of the C section in the figure (B). It is FIG. (4) for demonstrating the construction method of the joint part of the underground wall of this embodiment, (A) is a vertical sectional view of the wall thickness direction of an underground wall, (B) is an underground wall. (C) is CC 'sectional drawing in (B), (D) is an enlarged view of the D section in (C). It is FIG. (5) for demonstrating the construction method of the joint part of the underground wall of this embodiment, (A) is a vertical sectional view of the wall extension direction of an underground wall, (B) is the same. It is BB 'sectional drawing in figure (A), (C) is an enlarged view of the C section in the figure (B). It is FIG. (6) for demonstrating the construction method of the joint part of the underground wall of this embodiment, (A) is a vertical sectional view of the wall extension direction of an underground wall, (B) is the same. It is BB 'sectional drawing in figure (A), (C) is an enlarged view of the C section in the figure (B). It is a figure (the 7) for demonstrating the construction method of the joint part of the underground wall of this embodiment, (A) is a vertical sectional view of the wall extension direction of an underground wall, (B) is the same. It is BB 'sectional drawing in figure (A), (C) is an enlarged view of the C section in the figure (B). It is a horizontal sectional view which shows a space | gap part formation member. It is a horizontal sectional view showing the composition of a still water steel plate. It is a graph which shows the relationship between the elapsed time put in the water of a water stop material, and a volume expansion coefficient. It is an enlarged view which shows the joint part of the underground wall after construction completion. It is sectional drawing which shows the space | gap part formation member of another embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Underground wall 10 Leading element 11 H-type steel 12 Concrete 15 Excavation groove 20 Subsequent element 21 H-type steel 22 Concrete 25 Excavation groove 30 Water-stop steel plate 31 Steel plates 31A, 31B Round steel 32, 33 Water-stop material 40 Gap part formation member 41 Air gap 41A Circular portion 41B Direct portion 42 Styrofoam 142 Brush

Claims (9)

  1. A method for constructing a joint portion of a concrete ground wall constructed by constructing a succeeding element in succession to a preceding element,
    A preceding excavation step of excavating a portion corresponding to the preceding element of the ground to form a excavation groove;
    A cavity extending in the longitudinal direction is formed inside, and an end portion on the side of the succeeding element is cut, and when the cavity opens, an inflow preventing means for preventing foreign matter from flowing in from the opening is provided. A gap forming member installation step for installing a long gap forming member provided in the cavity so as to extend vertically at an end of the excavation groove on the trailing element side;
    A preceding concrete placing step for placing concrete constituting the preceding element;
    After the placed concrete is hardened, a portion corresponding to the subsequent element of the ground is excavated to form a drilling groove, and the end surface of the preceding element on the side of the subsequent element is cut. A subsequent excavation step of opening the cavity into the excavation groove by cutting an end of the member on the subsequent element side;
    The water stop plate is housed in the open cavity of the gap forming member, and the water stop means is interposed between the water stop plate and the gap forming member. The waterstop board construction step to build
    A subsequent concrete placing step for placing concrete constituting the subsequent element; and a method for constructing the joint portion of the underground wall.
  2. The construction method of the joint portion of the underground wall according to claim 1,
    The inflow prevention means is a member detachably loaded in the cavity;
    The construction method of the joint portion of the underground wall, wherein the water blocking plate erection step is performed after the member is removed.
  3. The construction method of the joint portion of the underground wall according to claim 1,
    The inflow prevention means is a brush coated with a water-repellent liquid provided in the cavity.
  4. It is a construction method of the joint portion of the underground wall according to any one of claims 1 to 3,
    The construction method of the joint portion of the underground wall, wherein the water stop means is a water stoppage expansion material attached to the water stop plate material.
  5. The construction method of the joint portion of the underground wall according to claim 3,
    The brush functions as the water stopping means, and the method for constructing the joint portion of the underground wall is characterized in that
  6. It is a construction method of the joint portion of the underground wall according to any one of claims 1 to 5,
    The construction method of the joint part of the underground wall characterized by attaching the water stop material to the part embedded in the said succeeding element of the said water stop board material so that it may extend in an up-down direction.
  7. It is a construction method of the joint part of the underground wall in any one of Claim 1 to 6,
    The cavity of the gap forming member extends in the wall extending direction of the underground wall in the state of being disposed in the excavation groove, and the end on the preceding element side is widened.
    The water stop plate material is provided with a widened portion that extends in the wall thickness direction at the end of the preceding element side in a state of being built in the excavation groove,
    In the water-stopping member erection step, the waterstop plate member is erected so that the widened portion is accommodated in the widened portion of the cavity of the gap portion forming member. Construction method.
  8. In the underground wall, a rebar cage or a core material extending in the vertical direction is embedded,
    The gap forming member is attached to the reinforcing bar or core so as to extend in a vertical direction,
    The joint portion of the underground wall according to any one of claims 1 to 7, wherein, in the gap portion forming member arranging step, the gap portion forming member is arranged by building the reinforcing bar or the core material. Construction method.
  9.   9. An underground wall, wherein the element is handed over by the construction method for the joint portion of the underground wall according to claim 1.
JP2008024362A 2008-02-04 2008-02-04 Construction method of joint part of underground wall, underground wall Expired - Fee Related JP4793388B2 (en)

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