JP2009057681A - Construction method for placing joint section of underground wall, placing joint structure of underground wall, and underground wall - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely secure the cut-off property of a placing joint surface even if irregularities are formed on the following element-side surface of a leading element. <P>SOLUTION: The leading element 10 is so constructed; that flexible cut-off sheets 110A and 110B are arranged so that the vicinities of both ends can abut on the following element 20 side end surface of the constructed leading element 10 so that a vertical space 150 elongated in a vertical direction along with the following element 20 side surface of the leading element 10 can be formed; that concrete 21 constituting the following element 20 is placed; and that a cut-off agent with fluidity is injected into the vertical space 150 which is formed of the cut-off sheets 110A and 110B and the following element 20 side surface of the leading element 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for constructing a joint portion of an underground wall constructed by constructing a succeeding element in succession to a preceding element.

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.
However, even when the cutting joint type joining method is used, slimes and earth and sand may adhere to the joining surface when forming irregularities, and water leakage may occur from the joining surface. When water leakage occurs in this way, a water stop treatment must be performed on this portion, which causes an increase in cost and delay in construction.

Therefore, for example, in Patent Document 1, as a method for improving the water stoppage of such a joining surface, the succeeding element is in a state in which the locking pipe is brought into contact with the joining surface that has been cut after the construction of the preceding element. Is constructed, a locking pipe is pulled out, a space extending in the vertical direction is formed on the succeeding element side of the joining surface, and a water-stopping material is filled in this space to improve the water-stopping property of the joining surface. Is described.
JP-A-7-11631

  However, in the method described in Patent Document 1, when the surface of the preceding element on the succeeding element side is uneven, the locking pipe cannot be brought into full contact with this surface. Moreover, when placing concrete, the position of the rocking pipe may shift. In these cases, the space formed by the rocking pipe is separated from the joining surface, and even if this space is filled with a water-stopping material, the water stoppage at the joining surface cannot be improved.

  The present invention has been made in view of the above-described problems, and the object of the present invention is to make sure that the water stoppage of the joining surface can be ensured even if the surface of the succeeding element on the side of the preceding element is uneven. It is to provide a method for constructing a joint.

  The construction method of the joint portion of the underground wall according to the present invention is a construction method of the joint portion of the concrete ground wall which is constructed by constructing the succeeding element continuously to the preceding element. A first step of constructing an element; a second step of disposing a flexible sheet-like member so as to form a vertical space extending in a vertical direction together with an end surface of the preceding element on the succeeding element side; and It is characterized by comprising a third step of placing concrete constituting the trailing element and a fourth step of injecting a water-stopping agent having fluidity into the vertical space.

  In the construction method, a steel member extending in a vertical direction is embedded in the underground wall, and the sheet-like member is connected to the steel member so as to extend in a vertical direction. In the second step, The sheet-like member may be arranged by building the steel member.

  In the second step, the sheet-like member is disposed, and a tubular member having a plurality of openings formed on the surface thereof is disposed in the vertical space. In the fourth step, the tubular member is disposed in the tubular member. A waterstop agent may be injected. Further, a spacing member may be attached to the sheet-like member so that the vertical space is not blocked by the pressure of the concrete.

Further, the sheet-like member may have water-stopping properties. In the third step, concrete may be placed until the lower end is buried in the sheet-like member, and the remaining concrete may be placed after the placed concrete has hardened. In addition, unevenness may be formed on the end surface of the preceding element on the trailing element side.
Further, the underground wall of the present invention is characterized in that the subsequent element is succeeded to the preceding element by the above construction method.
Further, the underground wall joint structure of the present invention is a concrete ground wall intermediate structure constructed by constructing a succeeding element in succession to the preceding element, wherein the preceding element is constructed. A sheet-like member having flexibility is disposed so as to form a vertical space extending in the vertical direction together with an end surface of the preceding element on the succeeding element side, and concrete constituting the succeeding element is placed. In addition, a water-stopping agent having fluidity is injected into the vertical space.

  According to the present invention, since the vertical space is formed by the flexible waterproof sheet and the trailing element side end face of the preceding element, the trailing element side end face of the leading element is uneven. However, the vertical space can be formed so as to be in contact with the joining surface by the water-stopping sheet being deformed and brought into close contact with the surface. For this reason, by injecting a water-stopping agent having fluidity into this vertical space, it is possible to reliably stop the joining surface even when there is unevenness on the end surface of the preceding element on the succeeding element side. it can.

Hereinafter, the construction method of the joint part of the underground wall of this invention is demonstrated in detail, referring drawings.
FIG. 1 is a diagram showing an underground wall 1 constructed by the construction method of the joint portion of the present embodiment,
(A) is the front view which removes and shows a part in order to show the structure inside the underground wall 1, (B) is II '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 leading element 10 and the trailing element 20 are respectively concrete 11 and 21 placed in an excavation hole formed by excavating the ground, and H-shaped steels 12 and 22 embedded in the concrete 11 and 21. . Concavities and convexities are formed on an end surface (hereinafter referred to as a joining surface) on the succeeding element side 20 of the preceding element 10, and the preceding element 10 and the succeeding element 20 are joined by a cutting joint method.

  2-8 is a figure for demonstrating the construction method of the joint part 2 of the underground wall 1 of this embodiment. 2A is a vertical sectional view in the wall width direction of the underground wall 1, and FIG. 2B is a vertical sectional view in the wall thickness direction. 3, 4, and 6, (A) is a vertical cross-sectional view in the wall width direction of the underground wall 1, and (B) is a cross-sectional view taken along line II ′ in (A). 5A is a vertical cross-sectional view in the wall width direction of the underground wall 1, FIG. 5B is a vertical cross-sectional view in the wall thickness direction, and FIG. 5C is II in FIG. 'Is a cross-sectional view. 7A is a vertical sectional view in the wall width direction of the underground wall 1, FIG. 7B is a sectional view taken along the line II ′ in FIG. 7A, and FIG. FIG. FIG. 8 is an enlarged horizontal sectional view of the joint portion between the preceding element 10 and the succeeding element 20.

  In constructing the underground wall 1, first, as shown in FIG. 2, a portion corresponding to the leading element 10 of the ground 3 is excavated using the excavator 210 lifted by the lifting device 200, and the excavation hole 13 is formed. Form. As the excavator 210, a horizontal multi-axis rotary cutter that can simultaneously cut the joining surface of the preceding element 10 and form irregularities when excavating the ground 3 corresponding to the subsequent element 20 described later is suitable. .

Next, as shown in FIG. 3, the H-shaped steel 12 constituting the preceding element 10 is built in the excavation hole 13 by a lifting device 200 at a predetermined interval.
Next, as shown in FIG. 4, concrete 11 constituting the leading element 10 is placed in the excavation hole 13.

  Next, as shown in FIG. 5, a portion corresponding to the succeeding element 20 of the ground 3 is excavated by using the excavator 210 lifted by the lifting device 200 to form the excavation hole 23. At this time, the ground 3 is excavated and the joining surface of the preceding element 10 is shaved by the excavator 210 to form irregularities on the surface.

  Next, as shown in FIG. 6, an H-shaped steel 22 constituting the trailing element 20 is built. At this time, the waterproof sheet 110 having flexibility is attached to the H-shaped steel 22 on the preceding element 10 side in advance through the steel plate 120, and when the H-shaped steel 22 is built, this waterproof sheet It builds so that the space (henceforth a vertical space) extended in the perpendicular direction enclosed by 110 and the joining surface of the preceding element 10 may be formed.

  FIG. 9 is an enlarged view of the vicinity of the joining surface of the preceding element 10 in a state where the H-shaped steel 22 is built. As shown in the figure, a steel plate extending in the vertical direction (perpendicular to the drawing) from the center in the wall thickness direction to the back surface side (the side opposite to the root cutting side) on the web surface 22A of the H-shaped steel 22 120 is welded so as to be substantially perpendicular to the web surface 22 </ b> A and over the entire length of the H-shaped steel 22. One end of each of the first water stop sheet 110A and the second water stop sheet 110B having flexibility is fixed to the front surface and the back surface of the steel plate 120, respectively. Specifically, the flat bars 122 are arranged on both sides of the overlapping portions of the waterproof sheets 110A and 110B and the steel plates 120, and the flat bars 122 are tightened with bolts 121 and nuts 123, whereby the waterproof sheets 110A and 110B are It is fixed to the steel plate 120. Note that the water-stop sheets 110A and 110B are connected to the H-shaped steel 22 via the steel plate 120 on the back side from the center in the wall thickness direction because water enters the joint surface from the back side and cracks in the concrete. This is because the crack can be prevented from proceeding deeply by stopping the water on the back side even if the above occurs.

  These first and second water-stop sheets 110A and 110B are bent in the direction of the back surface and the surface (surface for performing root cutting) of the underground wall 1, respectively, and each end portion is a joining surface of the preceding element 10. Abut. As described above, since the first and second water-stop sheets 110A and 110B have flexibility, even if the joining surface of the preceding element 10 has irregularities, the first and second water-proof sheets 110A and 110B are deformed and closely adhered to this shape. Accordingly, a vertical space 150 extending in the vertical direction is formed by the first and second water-stop sheets 110 </ b> A and 110 </ b> B and the joining surface of the preceding element 10.

  A steel pipe 130 is welded to the end of the steel plate 120 opposite to the side welded to the H-shaped steel 22 so as to extend in the vertical direction. A plurality of openings are provided on the surface of the steel pipe 130 at appropriate intervals so that the water-stopping agent injected into the steel pipe 130 flows into the vertical space 150 in the step of injecting the water-stopping agent described later into the steel pipe 130. (Not shown) is provided.

  In addition, a spacing member 140 is attached between the first waterproof sheet 110A and the second waterproof sheet 110B at an appropriate interval in the height direction. The spacing member 140 is made of, for example, a steel plate bent into a U-shape. The first water-stop sheet 110A and the second water-stop sheet 110B are in contact with both side surfaces of the spacing member 140, respectively, and these water-stop sheets 110A and 110B are bolted from the outside via plate members 143. 141 and the nut 142 are fastened to the spacing member 140 by tightening. With this configuration, when the concrete 21 constituting the trailing element 20 is placed, the pressure of the concrete 21 acts on the first and second water-stop sheets 110A and 110B from the outside of the vertical space 150. Since the spacing member 140 resists this pressure, the vertical space 150 can be held.

  As described above, after the H-shaped steel 22 is built and the water-stop sheets 110A and 110B are arranged so as to form the vertical space 150, the trailing element 20 is formed using the tremy tube 220 as shown in FIG. Concrete 21 to be placed is placed. At this time, first, the concrete 21 may be cast to a depth at which the lower ends of the water-stop sheets 110A and 110B are embedded, and the concrete 21 may be cast to a predetermined height after the concrete 21 is cured. This is because the lower portion of the vertical space 150 is closed when the concrete 21 placed to the depth where the lower ends of the water blocking sheets 110A and 110B are buried is closed, so that the placed concrete 21 is placed in the vertical space 150. This is because it can be prevented from flowing in.

  When the concrete 21 is placed, the ends of the water stop sheets 110 </ b> A and 110 </ b> B come into close contact with the joining surface of the preceding element 10 due to the pressure of the concrete 21, so that the concrete 21 can be prevented from flowing into the vertical space 150. Further, as described above, since the gap retaining member 140 is provided between the first and second water-stop sheets 110A and 110B, the water-stop sheets 110A and 110B are formed in the vertical space 150 by the pressure of the concrete 21. The inner space is prevented from being deformed, and the vertical space 150 is reliably secured. Moreover, since the water-stop sheets 110A and 110B are held by the steel plate 120, it is possible to prevent the positions of the water-stop sheets 110A and 110B from shifting when the concrete 21 is placed.

  In addition, since the surface side and the back side are partitioned off by the steel plate 120 and the water stop sheets 110A and 110B between the H-shaped steel 22 and the joining surface, the placed concrete 21 is the steel plate 120 and the water stop sheet 110A. , 110B may not be reliably filled up to the periphery. Therefore, it is preferable to place the concrete 21 by placing treme tubes 220 at a plurality of locations including the position indicated by the broken line in FIG. Thereby, the concrete 21 can be reliably filled to the circumference | surroundings of the steel plate 120 and the waterproof sheet 110A, 110B.

Next, after the cast concrete 21 is hardened, an injection member such as a hose is inserted into the steel pipe 130, and a water-stopping agent 40 having fluidity is injected through the injection member. The water-stopping agent 40 injected into the steel pipe 130 is filled into the vertical space 150 through an opening formed on the surface of the steel pipe 130. As such a water stop agent 40, polyvinyl alcohol (PVA) etc. can be used, for example. Since PVA is in the form of gel, even if the leading element 10 and the trailing element 20 are deformed after the construction of the underground wall 1, it can be appropriately deformed to ensure long-term water-stopping. can do.
Through the above steps, the succeeding element 20 is succeeded to the preceding element 10 and the underground wall 1 can be constructed.

  According to the construction method of the joint portion of the underground wall of the present embodiment, the flexible waterproof sheets 110A, 110B attached to the H-shaped steel 22 via the steel plate 120, and the joint surface of the preceding element 10 Since the vertical space 150 is formed by the above, even if the joining surface of the preceding element 10 has irregularities, the water-stop sheets 110A and 110B are deformed according to the irregularities and are in close contact with the joining surface. Thus, the vertical space 150 in contact with the joint surface can be formed. For this reason, filling the vertical space 150 with the water-stopping agent 40 causes the water-stopping agent 40 to be disposed on the joint surface, which is combined with the formation of irregularities on the joint surface of the preceding element 10. Thus, the joining surface can be stopped more reliably.

  Moreover, when the water stopping sheets 110A and 110B are supported by the steel plate 120 connected to the web 22A of the H-shaped steel 22, the positions of the water stopping sheets 110A and 110B are shifted when the concrete 21 is placed. Can be prevented.

  In addition, since the front and back surfaces of the underground wall 1 are edged by the water-stop sheets 110A and 110B, the steel plate 120, and the H-shaped steel 22, even if water enters the joint surface from the ground side, these If it does not go around the member, it will not leak. For this reason, it becomes possible to water-stop a joining surface more reliably.

Moreover, since the steel pipe 130 having an opening formed in the surface is arranged in the vertical space 150, a space for inserting an injection member such as a hose is surely secured, so the injection member is inserted into the steel pipe 130. Thus, the water stopping agent 40 can be injected through the inside of the injection member.
Further, by providing the spacing member 140 between the first and second water-stop sheets 110 </ b> A and 110 </ b> B, the first and second water-stop sheets 110 </ b> A and 110 </ b> B are brought into the vertical space 150 by the pressure of the concrete 21. The vertical space 150 for reliably filling the water-stopping agent 40 can be secured by suppressing deformation.

  In the present embodiment, the vertical space 150 is formed by the first and second waterproof sheets 110A and 110B and the joining surface of the preceding element 10. However, the present invention is not limited to this, and one waterproof sheet is used. The middle part of the front element 10 is fixed to the steel plate 120, the waterproof sheet is bent, and both ends are brought into contact with the joint surface of the preceding element, so that the joining surface of the preceding element 10 and the vertical space are formed. Is also possible.

  In the present embodiment, the waterproof sheets 110 </ b> A and 110 </ b> B are supported by the steel plate 120 connected to the H-shaped steel 22, but the present invention is not limited to this, so that the vertical space 150 can be formed on the waterproof sheets 110 </ b> A and 110 </ b> B. Any configuration may be used as long as it can be held.

  Moreover, in this embodiment, it was set as the structure which uses the water stop sheet | seat 110A, 110B which has water stop, However, It is not restricted to this, It has flexibility, The sheet-like member which the concrete 21 does not flow in into the vertical space 150 Can be used. In addition, by giving water resistance to the sheet-like member, the joining surface is stopped not only by the water-stopping agent 40 but also by the sheet-like member, so that the joining surface can be more reliably stopped.

  In the present embodiment, the case where the cutting element is applied to the joining surface of the preceding element 10 and the succeeding element 20 has been described. However, the present invention is not limited to this, and the joining surface of the normal leading element 10 and the succeeding element 20 is also used. It is possible to apply.

  Moreover, although this embodiment demonstrated the case where this invention was applied to the underground wall 1 of the structure by which the H-shaped steels 12 and 22 were embed | buried in the concrete 11 and 21, it is not restricted to this, and a reinforcing steel cage is put in concrete. Can be applied to the underground wall of the structure in which the sheet is embedded by fixing the sheet-like member to the reinforcing bar cage instead of the H-shaped steel. In short, the concrete leading element 10 and the trailing element 20 It is possible to apply this invention to the underground wall comprised by handing over.

  In the present embodiment, the concrete 21 is placed to a depth at which the lower ends of the water-stop sheets 110A and 110B are embedded, and the water-stopping agent 40 flows into the vertical space 150 after the concrete 21 is cured. However, the present invention is not limited thereto, and after placing the concrete 21 to a depth at which the lower ends 110A and 110B of the water-stop sheet are embedded, the top surfaces of the concrete 21 and the water-stop agent 40 are adjusted so as to have substantially the same height. The concrete 21 may be placed and the water-stopping agent 40 may be injected. By doing in this way, since the pressure of the concrete 21 and the water stopping agent 40 becomes equal, the concrete 21 can be prevented from flowing into the vertical space 150.

It is a figure which shows the structure of the joint part of an underground wall, (A) is a front view which removes a part in order to show an internal structure, (B) is I-- in (A). It is I 'sectional drawing. It is a figure which shows a mode that the ground of the part which corresponds to a prior | preceding element is excavated, and shows a mode that an excavation hole is formed, (A) is a vertical sectional view of a wall width direction, (B) is a vertical sectional view of a wall thickness direction. It is a figure which shows a mode that the H-shaped steel which comprises a preceding element is lifted in a drilling hole, (A) is a vertical sectional view of a wall width direction, (B) is II 'sectional drawing in (A) It is. It is a figure which shows a mode that the concrete which comprises a preceding element is placed in a digging hole, (A) is a vertical sectional view of a wall width direction, (B) is II 'sectional drawing in (A). is there. It is a figure which shows a mode that excavating the ground of the part which corresponds to a succeeding element, (A) is a vertical sectional view of a wall width direction, (B) is a vertical sectional view of a wall thickness direction, (C) is ( It is II 'sectional drawing in A). It is a figure which shows a mode that the H-shaped steel which comprises a trailing element is lifted in a drilling hole, (A) is a vertical sectional view of a wall width direction, (B) is II 'cross section in (A). FIG. It is a figure which shows a mode that the concrete which comprises a trailing element is laid in a digging hole, (A) is a vertical sectional view of the wall width direction, (B) is II 'sectional drawing in (A) (C) is an enlarged view of part II in (B). It is a figure which shows the state with which the water stop agent was filled in the vertical space. It is a figure which shows the state in which the vertical space was formed by the water stop sheet | seat and the succeeding element side end surface of a preceding element.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ground wall 2 Joint part 3 Ground 10 Leading element 11, 21 Concrete 12, 22 H-shaped steel 13, 23 Excavation hole 20 Subsequent element 110, 110A, 110B Waterproof sheet 120 Steel plate 121 Bolt 122 Flat bar 123 Nut 130 Steel pipe 140 Spacing material 141 Bolt 142 Nut 143 Plate material 150 Vertical space 200 Lifting device 210 Excavator

Claims (9)

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 first step of constructing the preceding element;
A second step of disposing a flexible sheet-like member so as to form a vertical space extending in a vertical direction together with an end surface of the preceding element on the trailing element side;
A third step of placing concrete constituting the trailing element;
And a fourth step of injecting a water-stopping agent having fluidity into the vertical space. A steel frame member extending in the vertical direction is embedded in the underground wall,
The sheet-like member is connected to the steel member so as to extend in the vertical direction,
The construction method of the joint portion of the underground wall according to claim 1, wherein in the second step, the sheet-like member is arranged by building the steel member. It is a construction method of the joint portion of the underground wall according to claim 1 or 2,
In the second step, the sheet-like member is arranged, and a cylindrical member having a plurality of openings formed on the surface in the vertical space is arranged,
In the fourth step, the jointing method is characterized by injecting a water-stopping agent into the cylindrical member.   The joint member according to any one of claims 1 to 3, wherein a spacing member is attached to the sheet-like member so that the vertical space is not blocked by the pressure of the concrete. Construction method.   The construction method for the joint portion of the underground wall according to any one of claims 1 to 4, wherein the sheet-like member has a water-stopping property. In the third step,
6. The concrete is placed until the lower end is buried in the sheet-like member, and after the placed concrete is hardened, the remaining concrete is placed. To install the joints in the underground wall.   The method for constructing the joint portion of the underground wall according to any one of claims 1 to 6, wherein an unevenness is formed on an end surface of the preceding element on the trailing element side.   A subterranean wall in which a succeeding element is handed over to a preceding element by the construction method according to any one of claims 1 to 7. It is a joint structure of a concrete ground wall constructed by constructing a succeeding element in succession to a preceding element,
The preceding element is constructed, and a flexible sheet-like member is arranged so as to form a vertical space extending in the vertical direction together with the end surface of the preceding element on the succeeding element side, and the succeeding element is configured. An underground wall splicing structure characterized in that concrete to be placed is poured and a water-stopping agent having fluidity is injected into the vertical space.

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