JP6644304B1 - Water impermeable side wall structure, bottom slab / side wall structure, and water impermeable side wall construction method - Google Patents

Abstract

[PROBLEMS] To provide a water impermeable side wall structure, a bottom slab / side wall structure, and a method for constructing a water impermeable side wall, which can easily form good-quality holding concrete. A water-impervious side wall structure includes a side wall skeleton, a side wall impermeable layer stretched on the inner surface thereof, a side wall holding concrete for protecting the same, and a right and left side wall covering the side wall holding concrete. A plurality of precast concrete plates 17 are arranged in a plurality of rows in the direction, and an H-shaped steel column 18 is arranged between each adjacent row. One flange portion 20 of each H-shaped steel column 18 is buried in the side wall holding concrete 9, and the inner surface of the other flange portion 21 is a surface of the corresponding precast concrete plate 17 on the side opposite to the side wall impermeable layer 15. Is in contact with [Selection diagram] Fig. 1

Description

  TECHNICAL FIELD The present invention relates to a water impermeable side wall structure, a bottom slab / side wall structure, and a method for constructing a water impermeable side wall suitable for construction of a final disposal site for landfill disposal of waste.

  At the final disposal site for landfilling waste, it is necessary to take measures to prevent the leachate generated from landfilled waste from leaking to the outside. As such measures, conventionally, waterproofing has been performed on a wall surface of a landfill section constructed of concrete using a water-blocking sheet (for example, see Patent Document 1).

  In the method of constructing a water-impervious side wall structure disclosed in Patent Literature 1, first, an outer RC wall of the side wall is formed, and a water-impervious structure in a side wall divided vertically by predetermined dimensions inside the lowermost part thereof. The lowermost part of the divided parts of the body is adhered, and concrete is poured into the part other than the upper edge of the divided part. Thereby, the lowermost part of the inner RC wall (pressing concrete) of the side wall is formed. Thereafter, the remaining portion above the bottom is formed.

  When forming the remaining part, the upper part adjacent to the lower part already formed is bonded to the outer RC wall, and the upper edge of the lower part and the upper part Is welded to the lower edge of the upper portion to add the upper divided portion. Then, concrete is poured into the added divided portion while leaving the upper end edge of the divided portion, and a portion of the inner RC wall corresponding to the added divided portion is formed on the lower inner RC wall portion. It is formed integrally.

  By repeating such a process for each divided portion until the inner RC wall reaches the height of the outer RC wall, the impermeable side wall structure is constructed.

JP 2017-104837 A

  However, according to the construction method of Patent Literature 1, as the formwork for placing the holding concrete in the process for each divided portion, a plywood or a steel plate in which face materials are fixed at two upper and lower points is used. In order to secure the flatness by resisting the lateral pressure applied to the face material, an excessive stiffening material and a process for mounting and removing the material are required. On the other hand, in order to avoid this, if care is taken not to increase the lateral pressure during compaction at the time of placing concrete, defective parts may be generated due to insufficient compaction.

  An object of the present invention is to provide a water impermeable side wall structure, a bottom slab / side wall structure, and a method for constructing a water impermeable side wall, which can easily form good-quality holding concrete in view of the problems of the related art.

The impermeable side wall structure of the present invention,
A side wall skeleton, a side wall impermeable layer stretched on the inner surface of the side wall skeleton, and a water impervious side wall structure including a holding concrete protecting the side wall impermeable layer,
A plurality of precast concrete plates arranged in a plurality of rows in the left-right direction so as to cover the side opposite to the side wall impermeable layer of the holding concrete,
An H-shaped steel column disposed between each adjacent row of the precast concrete plates,
One flange portion of each H-shaped steel column is buried in the inside of the holding concrete, and the inner surface of the other flange portion is the side wall impervious layer at one lateral edge of the corresponding precast concrete plate. And is in contact with the opposite surface.

  According to the present invention, a side wall impermeable layer is provided on the inner surface of the side wall frame, a plurality of H-shaped steel columns are erected along the side wall frame, and a precast concrete plate is arranged between each adjacent H-shaped steel column. By laying concrete between the side wall impermeable layer and the precast concrete plate, the impermeable side wall structure can be easily formed as having good-quality holding concrete.

The bottom plate / sidewall structure of the present invention is:
A bottom plate / sidewall structure comprising a bottom plate and a side wall provided with a seepage control of a waste disposal site,
A first portion integrally forming a lower RC portion that is a lower reinforced concrete portion of the bottom slab and a side wall skeleton that is a reinforced concrete portion outside the side wall;
An upper RC portion, which is an upper reinforced concrete portion of the bottom slab, and a second portion integrally forming a presser concrete inside the side wall;
A bottom plate impermeable layer provided between the lower RC portion and the upper RC portion,
Comprising a side wall impermeable layer provided between the side wall skeleton and the holding concrete,
A plurality of precast concrete plates are arranged in a plurality of rows in the left-right direction so as to cover the surface on the side opposite to the side wall impermeable layer of the holding concrete,
Between each adjacent row of said precast concrete plates, H-shaped steel columns are arranged,
One flange portion of each H-shaped steel column is buried in the inside of the holding concrete, and the inner surface of the other flange portion is the side wall impervious layer at one lateral edge of the corresponding precast concrete plate. And is in contact with the opposite surface.

  According to the present invention, a side wall impermeable layer is provided on the inner surface of the side wall frame, a plurality of H-shaped steel columns are erected along the side wall frame, and a precast concrete plate is arranged between each adjacent H-shaped steel column. By pouring concrete between the side wall impermeable layer and the precast concrete plate, the bottom slab / side wall structure can be easily formed as having high quality holding concrete.

  In this case, a lower end of each of the plurality of H-shaped steel columns is supported by a fixing plate embedded in the second portion, and is fixed with root-mound concrete, and an upper end is fixed to the side wall frame. Is preferred.

  According to this, the lower end and the upper end of the H-shaped steel column are securely fixed and supported by the side wall frame, the upper RC portion and the lower RC portion, and the gap between the side wall impermeable layer and the precast concrete plate. The concrete can be poured into the building without any trouble.

  In the present invention, it is preferable that one of the flange portions of the H-shaped steel column is provided with a shear connector projecting from the surface on the side of the side wall impermeable layer into the holding concrete. According to this, the connection between the holding concrete and the H-shaped steel column can be strengthened.

The method for constructing the impermeable side wall of the present invention includes:
A method for constructing a water impermeable side wall including a side wall skeleton, a side wall impermeable layer provided inside the side wall skeleton, and a holding concrete for protecting the side wall impermeable layer,
A split part bonding step of bonding one of the split parts of the side wall impermeable layer divided into predetermined dimensions in the vertical direction inside the side wall skeleton,
A plurality of H-shaped steel columns along the side wall skeleton at a predetermined distance from the side wall skeleton, and an H-shaped steel column erection step in which the flange surface is erected at predetermined intervals in a posture along the side wall skeleton;
A reinforcing step for performing reinforcing for the holding concrete,
A precast concrete plate having a vertical dimension corresponding to the divided part and a horizontal dimension corresponding to the predetermined interval bonded in the divided part bonding step is attached to the divided part between the adjacent H-shaped steel columns. At corresponding upper and lower positions, the surfaces of the left and right edge portions of the precast concrete plate opposite to the divided portion abut against the inner surface of the flange portion of the H-shaped steel column opposite to the divided portion. A precast placement step to place,
By casting concrete between the portion excluding the upper end edge of the divided portion adhered in the divided portion bonding step and the precast concrete plate arranged in the precast arranging step, the division of the holding concrete is performed. Pressing part forming step of forming a part corresponding to the part,
A divided portion adhered initial step intends by Rigyo to adhere one of the divided portions of the divided portions adhering step to the inside of the lower portion of the side wall skeleton,
The divided part other than the divided part bonded in the divided part bonding initial step after performing the divided part bonding initial step, the H-shaped steel column erecting step, the reinforcing arrangement step, the precast arrangement step, and the holding part forming step The step of bonding the divided part, the step of arranging the precast, and the step of forming the holding part are repeated until the holding concrete is formed at a predetermined height.

  According to the present invention, a portion corresponding to the divided portion of the holding concrete is formed by placing concrete between the divided portion bonded in the divided portion bonding initial step or the divided portion bonding step and the corresponding precast concrete. It is formed. Therefore, when laying concrete, an excessive stiffening material and its installation and removal are not required, and compaction of the concrete to be laid can be performed without concern for an increase in lateral pressure. Therefore, it is possible to form the holding concrete with good quality and easily.

It is sectional drawing of the bottom slab and side wall structure of the final disposal site which concerns on one Embodiment of this invention. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1, showing a part of a side wall structure. FIG. 2 is a reinforcing arrangement diagram of a root-wound concrete portion for fixing a base end portion of an H-shaped steel column of the bottom slab / sidewall structure of FIG. 1. FIG. 4 is a plan view showing a fixing plate buried in a root-wound concrete part of FIG. 3 and supporting a lower end of an H-shaped steel column. It is sectional drawing of the upper end part of the side wall structure in the bottom slab / side wall structure of FIG. It is sectional drawing which shows the mode seen from the upper part when the upper end part of the H-shaped steel column is fixed to a side wall skeleton. It is a figure which shows a mode that a precast concrete board is arrange | positioned between H-shaped steel columns in the corner part of the bottom slab and side wall structure of FIG. It is a flowchart which shows the procedure of constructing the bottom slab / sidewall structure of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the bottom plate / sidewall structure 1 of the embodiment constitutes a bottom plate 2 subjected to water-blocking work and a side wall 3 as a water-blocking side wall structure in a final disposal site for waste. Things.

  The bottom plate / sidewall structure 1 includes a first portion 4 and a second portion 5. The first portion 4 integrally forms a lower RC portion 6 which is a lower reinforced concrete portion of the bottom slab 2 and a side wall frame 7 which is a reinforced concrete portion outside the side wall 3. The second portion 5 integrally forms an upper RC portion 8 which is an upper reinforced concrete portion of the bottom slab 2 and a side wall holding concrete 9 inside the side wall 3.

  The lower RC portion 6 is provided on base concrete 11 cast on the ground improvement layer 10. At an appropriate position between the lower RC portion 6 and the base concrete 11, a concave groove 12 closed by the lower surface of the lower RC portion 6 is formed. In the concave groove 12, a perforated pipe 13 for collecting water is buried using single crushed stone. The perforated pipe 13 is used for discharging and detecting leachate and the like from the waste put into the final disposal site.

  Between the lower RC portion 6 and the upper RC portion 8 of the bottom slab 2, a bottom slab layer 14 is provided. A side wall impermeable layer 15 is provided between the side wall frame 7 of the side wall 3 and the side wall holding concrete 9 inside the side wall frame 7. The upper RC portion 8 and the side wall presser concrete 9 function as presser concrete for protecting the bottom slab water impervious layer 14 and the side wall impervious layer 15, respectively. Soft FRP waterproofing 16 is applied to the outer surface of the side wall frame 7 and the inner surface of the side wall holding concrete 9. A cement-based noncombustible material finish is applied on the FRP waterproofing 16.

  The bottom plate waterproof layer 14 is configured to achieve good water barrier while protecting the two-layer waterproof sheet by sandwiching it between the three protective mats, and has a soft FRP waterproof on the upper side. Is done. The thickness of each protection mat is, for example, 20 mm.

  Similarly, the side wall impermeable layer 15 is configured so as to achieve good water impermeability while protecting the two layers of water impermeable sheets between the three layers of protection mats. , Soft FRP waterproofing. The thickness of each protective mat is, for example, 10 mm. The side wall impermeable layer 15 is divided at a height of about 1 m in the vertical direction, and is configured by bonding the divided parts.

  As shown in FIGS. 1 and 2, a plurality of precast concrete plates 17 in a plurality of rows in the left-right direction are provided on the surface of the side wall holding concrete 9 opposite to the side wall impermeable layer 15 so as to cover the surface. Be placed. The thickness of the precast concrete plate 17 is, for example, 100 mm, and the reinforcing bars of the precast concrete plate 17 are, for example, horizontal / vertical D10- # 200. A joint made of a butyl rubber double-sided tape is provided between vertically adjacent precast concrete plates 17.

  An H-shaped steel column 18 is arranged between each adjacent row of the precast concrete plate 17. As the H-shaped steel column 18, for example, one having a dimension of H-200 × 200 × 8 × 12 and subjected to hot-dip galvanizing can be adopted. In the side wall holding concrete 9, for example, a D13- # 200W wall reinforcing bar 19 coated with an epoxy resin is arranged. The crossing portions of the wall reinforcing bars 19 are bound by a resin binding band. The side wall holding concrete 9 is formed by casting fiber reinforced concrete at a height of every 1000 mm.

  One flange portion 20 of each H-shaped steel column 18 is buried in the inside of the side wall holding concrete 9, and the inner surface of the other flange portion 21 is a side wall shield at one end in the left-right direction of the corresponding precast concrete plate 17. It is in contact with the surface opposite to the hydraulic layer 15.

  The lower end of each H-shaped steel column 18 is supported by a fixing plate 22 as shown in FIG. 4 embedded in the second portion 5 as shown in FIGS. On the other hand, the upper end of each H-shaped steel column 18 is connected to the side wall frame 7 via a gusset plate 25 having a reinforcing plate 24 embedded in the side wall pressing concrete 9 and a base plate 26 as shown in FIGS. Fixed.

  On one flange portion 20 of the H-shaped steel column 18, a shear connector 27 protruding into the side wall holding concrete 9 from the surface on the side wall impermeable layer 15 side is provided.

  At the corner of the side wall holding concrete 9, as shown in FIG. 7, two angle irons 28 are formed on the outer surface of the other flange 21 of the corner H-shaped steel column 18 so as to form a U-shape in cross section. Fixed. Thereby, even at the corners, the adjacent precast concrete plate 17 can be supported without any trouble at right angles.

  As shown in FIG. 5, the upper end of the side wall 3 is higher than the upper end of the H-shaped steel column 18. The raised portion 29 projects so that the side wall pressing concrete 9 forms an almost flat surface on the upper end surface of the H-shaped steel column 18 with the outer surface of the other flange portion 21 of the H-shaped steel column 18. In the raised portion 29, reinforcing reinforcement 30 is provided from the side wall skeleton 7 to the side wall holding concrete 9.

  On the upper end surface of the side wall 3 composed of the side wall frame 7 and the side wall holding concrete 9, a roof structure 31 and a catwalk 32 of the final disposal site are provided.

  Bentonite mixed soil 33 is spread over the entire upper surface of the upper RC portion 8 of the bottom slab 2 with a thickness of about 300 mm, so that a higher degree of water shielding against leachate is secured. On the bentonite mixed soil 33, crushed stone 34 mixed with dust mixed with powdered crushed stone is spread with a thickness of about 200 mm.

  The bottom slab / sidewall structure 1 can be constructed according to the procedure shown in the flowchart of FIG. That is, first, in step S1, the lower RC portion 6 of the bottom slab 2 and the side wall frame 7 of the side wall 3 are integrally formed of reinforced concrete.

  Note that the side wall frame 7 may be formed while performing the joint every time the divided part is installed in accordance with the vertical dimension of the divided part of the side wall impermeable layer 15. In this case, a high water-blocking function of the side wall frame 7 can be maintained by providing a water-blocking plate at the joint portion.

  Next, in step S <b> 2, the bottom plate impermeable layer 14 is arranged above the lower RC portion 6. Next, in step S3, the lowermost divided portion of the side wall impermeable layer 15 divided into predetermined dimensions in the vertical direction is adhered to the inside of the lowermost portion of the side wall skeleton 7 (divided portion bonding initial step). . For this bonding, a double-sided tape can be used. The divided portion includes a portion in contact with the root-wound concrete 23 and a portion thereabove.

  At this time, the vertical dimension of the divided portion has a margin, and the lower edge of the divided portion is folded or overlaid on or below the edge portion of the bottom slab 14. Be placed. It should be noted that, as in the case of the joining of the divided portions described below, the bottom plate impermeable layer 14 and the respective layers constituting the divided portions are welded to each other to join the bottom plate impermeable layer 14 and the divided portion. Good.

  Next, in step S4, a plurality of H-shaped steel columns 18 are arranged along the side wall skeleton 7 at a position separated from the side wall skeleton 7 by a predetermined distance in consideration of the thickness of the side wall holding concrete 9, and the flange surface of the plurality of H-shaped steel columns 18 It is erected at a predetermined interval D, for example, at an interval of 1500 mm in an attitude along the same direction (H-shaped steel column erecting step).

  3 and 4, the fixing plate 22 supports the base end portion of the H-shaped steel column 18 on the lower RC portion 6, and moves the upper end portion of the H-shaped steel column 18 to the position shown in FIG. As described above, the fixing is performed on the side wall frame 7.

  Next, in step S5, reinforcement is provided for the upper RC portion 8 and the side wall holding concrete 9 (rebar arrangement step). The reinforcement includes the reinforcement at the portion of the rooted concrete 23 as shown in FIG. 3 and the reinforcement at the beam portion 36 including the reinforcement. And this reinforcement is suitable for integrally forming the upper RC portion 8 and the side wall holding concrete 9. In addition, as shown in FIG. 5, the reinforcement of the upper end portion 29 of the side wall holding concrete 9 and the side wall skeleton 7 is provided so as to straddle both upper end portions so that these upper end portions can be firmly connected. Will be

  Next, in step S6, the vertical dimension corresponding to the upper part of the divided portion bonded in step S3 above the part in contact with the root-wrapped concrete 23, and the horizontal dimension corresponding to the predetermined interval D of the H-shaped steel column 18 Is placed at the upper and lower positions corresponding to the upper portion of the divided portion between the adjacent H-shaped steel columns 18 (precast placement step).

  This arrangement is performed such that the surfaces of the left and right edge portions of the precast concrete plate 17 opposite to the divided portion abut against the inner surface of the flange portion 21 of the H-shaped steel column 18 opposite to the divided portion. (See FIG. 7).

  In order to arrange in this manner, as shown in FIG. 2, a resin camber is provided between an inner surface of the flange portion 20 on the divided portion side of the H-shaped steel column 18 and a surface of the precast concrete plate 17 opposed thereto. 35 are arranged. That is, the precast concrete plate 17 is fixed to the H-shaped steel column 18 by the resin camber 35.

  Next, in step S7, concrete is cast between the portion excluding the upper edge of the divided portion bonded in step S3 and the precast concrete plate 17 arranged in step S6 (pressing portion forming step). At the same time, concrete is cast on the reinforcing bars of the beam portion 36 and on the bottom slab 14.

  As a result, the upper RC portion 8 of the bottom slab 2 and the lowermost portion of the side wall pressing concrete 9 of the side wall 3 corresponding to the lowermost divided portion of the side wall impermeable layer 15 are formed. This portion includes the beam portion 36.

  Note that the lowermost divided portion is further divided into a portion in contact with the beam portion 36 and a portion thereabove, and after the beam portion 36 and the upper RC portion 8 are formed first, the portion corresponding to the upper portion is formed. A portion of the side wall pressing concrete 9 may be formed (a pressing portion forming step). In this case, the step of forming the upper portion and the portion of the side wall pressing concrete 9 corresponding to the upper portion is regarded as a divided portion bonding initial step.

  Next, the remaining portion above the lowermost divided portion of the side wall impermeable layer 15 and the remaining portion above the lowermost portion of the side wall holding concrete 9 are formed (remaining portion forming step).

  That is, first, in Step S8, the divided portion adjacent to the upper side of the previously formed lower divided portion of the side wall impermeable layer 15 is bonded to the side wall frame 7, and the upper end edge of the lower divided portion is The upper divided part is added by welding the lower edge of the upper divided part (divided part bonding step).

  The welding at the welding margin at this time is performed for each layer of the water-impervious sheet and the protective mat constituting the divided portion. At this time, the layers are arranged such that the layer of the upper divided portion is located inside the site of the layer of the lower divided portion (the side of the space where waste is stored in the final disposal site).

  Next, in step S9, the precast concrete plates 17 corresponding to the added divided portions are arranged between the adjacent H-shaped steel columns 18 (precast arrangement step). This arrangement is similar to the case of step S6, in which the surface opposite to the divided portion of the left and right edge portions of the precast concrete plate 17 is inside the flange portion 21 of the H-shaped steel column 18 opposite to the divided portion. It is performed so as to contact the surface.

  Next, in step S10, concrete is cast between the divided part added in step S8 and the precast concrete plate 17 added in step S9, leaving the upper edge of the divided part (pressing part forming step). As a result, a portion corresponding to the added divided portion of the side wall pressing concrete 9 is formed integrally with the previously formed side wall pressing concrete 9 portion.

  Then, steps S8 to S10 are repeated until it is determined in step S11 that the side wall holding concrete 9 has reached the height of the side wall frame 7 (remaining portion forming step).

  Then, in step S12, the construction of the bottom slab / sidewall structure 1 is completed by forming the upper end portion 29 of the side wall holding concrete 9 by casting concrete.

  The reason why the side wall holding concrete 9 is formed by casting the fiber reinforced concrete every 1000 mm as described above is as follows. That is, after the strength of the cast concrete on the lower side is developed and the fixing strength of the H-shaped steel column 18 with respect to the concrete is ensured, the concrete on the upper side of the cast concrete is cast, so that the 2) The amount of deflection can be kept to a minimum. Then, by repeating this, it is possible to suppress the entire side wall pressing concrete 9 from spreading.

  The reason for using the precast concrete plate 17 is as follows. That is, the fiber reinforced concrete and the precast concrete plate 17 cast in place are not completely integrated. This has the effect that hair cracks or the like of cast-in-place concrete do not affect the surface layer. Thereby, the difference in behavior (temperature change, seismic force, etc.) of each layer of the side wall skeleton 7, side wall impermeable layer 15, cast-in-place concrete (side wall concrete 9), and precast concrete plate 17 is absorbed to some extent between the layers. The risk of breakage of the side wall structure can be reduced. If the precast concrete plate 17 is damaged, the minimum unit (1.5 mx 1.0 m) can be replaced or repaired.

  As described above, the embodiment of the present invention has been described, but the present invention is not limited to this. For example, steps S3 to S5 in FIG. 8 may be performed in a different order. In addition, the present invention is a waste disposal site that requires a high level of waterproof and water-blocking and a strong landfill area such as mercury-containing waste, waste other than mercury-containing waste, for example, radioactive waste It can be preferably applied to the disposal site. Further, the present invention is not limited to the final disposal of waste, but can be applied to intermediate disposal sites in the case of disposal of radioactive waste and the like.

  DESCRIPTION OF SYMBOLS 1 ... Bottom plate / sidewall structure, 2 ... Bottom plate, 3 ... Sidewall, 4 ... First part, 5 ... Second part, 6 ... Lower RC part, 7 ... Sidewall body, 8 ... Top RC part, 9 ... Sidewall holder Concrete: 10: ground improvement layer, 11: base concrete, 12: concave groove, 13: perforated pipe, 14: bottom slab, 15: side wall impermeable layer, 16: FRP waterproofing, 17: precast concrete board , 18: H-shaped steel column, 19: wall reinforcing reinforcement, 20: flange portion, 21: flange portion, 22: fixing plate, 23: rooted concrete, 24: reinforcing plate, 25: gusset plate, 26: base plate, 27 ... Shear connector, 28 ... angle iron, 29 ... raised part, 30 ... reinforcement, 31 ... roof structure, 32 ... catwalk, 33 ... bentonite mixed soil, 34 ... dust mixed crushed stone, 35 ... resin camber , 36 ... the beam portion.

Claims (5)

A side wall skeleton, a side wall impermeable layer stretched on the inner surface of the side wall skeleton, and a water impervious side wall structure including a holding concrete protecting the side wall impermeable layer,
A plurality of precast concrete plates arranged in a plurality of rows in the left-right direction so as to cover the side opposite to the side wall impermeable layer of the holding concrete,
An H-shaped steel column disposed between each adjacent row of the precast concrete plates,
One flange portion of each H-shaped steel column is buried in the inside of the holding concrete, and the inner surface of the other flange portion is the side wall impervious layer at one lateral edge of the corresponding precast concrete plate. A water-impervious side wall structure, which is in contact with a surface on the side opposite to the side wall. A bottom plate / sidewall structure comprising a bottom plate and a side wall provided with a seepage control of a waste disposal site,
A first portion integrally forming a lower RC portion that is a lower reinforced concrete portion of the bottom slab and a side wall skeleton that is a reinforced concrete portion outside the side wall;
An upper RC portion, which is an upper reinforced concrete portion of the bottom slab, and a second portion integrally forming a presser concrete inside the side wall;
A bottom plate impermeable layer provided between the lower RC portion and the upper RC portion,
Comprising a side wall impermeable layer provided between the side wall skeleton and the holding concrete,
On the surface opposite to the side wall impermeable layer of the holding concrete, a plurality of precast concrete plates are arranged in a plurality of rows in the left-right direction so as to cover the surface,
Between each adjacent row of said precast concrete plates, H-shaped steel columns are arranged,
One flange portion of each H-shaped steel column is buried in the inside of the holding concrete, and the inner surface of the other flange portion is the side wall impervious layer at one lateral edge of the corresponding precast concrete plate. A bottom plate and a side wall structure, wherein the bottom plate and the side wall structure are in contact with a surface on a side opposite to the side plate.   A lower end of each of the plurality of H-shaped steel columns is supported by a fixing plate embedded in the second portion, and is fixed with root-wrapped concrete, and an upper end is fixed to the side wall frame. The bottom plate / sidewall structure according to claim 2.   The shear connector protruding from the surface on the side of the side wall impermeable layer into the holding concrete is provided on one flange portion of the H-shaped steel column, The shear connector according to any one of claims 1 to 3, wherein Structure. A method for constructing a water impermeable side wall including a side wall skeleton, a side wall impermeable layer provided inside the side wall skeleton, and a holding concrete for protecting the side wall impermeable layer,
A divided part bonding step of bonding one of the divided parts of the side wall impermeable layer divided into predetermined dimensions in the vertical direction inside the side wall skeleton,
A plurality of H-shaped steel columns along the side wall skeleton at a predetermined distance from the side wall skeleton, and an H-shaped steel column erection step in which the flange surface is erected at predetermined intervals in a posture along the side wall skeleton;
A reinforcing step for performing reinforcing for the holding concrete,
A precast concrete plate having a vertical dimension corresponding to the divided part and a horizontal dimension corresponding to the predetermined interval bonded in the divided part bonding step is attached to the divided part between the adjacent H-shaped steel columns. At corresponding upper and lower positions, the surfaces of the left and right edge portions of the precast concrete plate opposite to the divided portion abut against the inner surface of the flange portion of the H-shaped steel column opposite to the divided portion. A precast placement step to place,
By casting concrete between the portion excluding the upper end edge of the divided portion adhered in the divided portion bonding step and the precast concrete plate arranged in the precast arranging step, the division of the holding concrete is performed. Pressing part forming step of forming a part corresponding to the part,
A divided portion adhered initial step intends by Rigyo to adhere one of the divided portions of the divided portions adhering step to the inside of the lower portion of the side wall skeleton,
The divided part other than the divided part bonded in the divided part bonding initial step after performing the divided part bonding initial step, the H-shaped steel column erecting step, the reinforcing arrangement step, the precast arrangement step, and the holding part forming step the dividing portion bonding step, the precast arrangement step and the presser portion forming step, water shield sidewall construction wherein the repeated until the pressing concrete is formed at a predetermined height for.

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