JP6139583B2 - Retaining wall and retaining wall installation method - Google Patents

Description

  The present invention relates to a retaining wall that is partially embedded in soil when a road or the like is constructed.

  Conventionally, it has a bottom slab extending horizontally along the upper surface of the foundation concrete as a foundation, and a vertical wall erected upward from one edge of the bottom slab. A retaining wall having a generally L-shaped cross-sectional view with a free end as a distal end is well known (for example, see Patent Document 1). In recent years, a technique for configuring the retaining wall with a precast (concrete) product has been proposed. The retaining wall made of such a precast product has an advantage that the construction period can be shortened as compared with the case where the precast product is used. Currently, in the case of a retaining wall made of such a precast product, an integrally molded one is used (for example, see Patent Document 1).

  In general, the size of the retaining wall, that is, the dimension is determined according to the condition of the construction site, that is, the height of the step to be provided on the topography. That is, the height dimension of the vertical wall is determined according to the height of the step, and the length of the bottom plate is determined from the height dimension of the vertical wall. And since the foundation concrete which is a foundation must be laid according to the length of this bottom slab, when constructing the retaining wall, it is necessary to excavate the ground having a dimension larger than the length of the bottom slab. That is, the higher the level of the step desired to be provided on the terrain, the larger the area for excavating the ground and the greater the amount of excavated soil.

    JP-A-2005-282216

  Although there are situations as described above, various retaining wall sizes are required depending on the construction site, but considering the restrictions on transportation, the retaining wall size as a precast product is limited. Therefore, depending on the construction location, precast products may not be compatible. In other words, as a result of taking into account the restriction on transportation of a general road by a vehicle such as a large vehicle, the limit of the height of the retaining wall that can be handled in an integrated manner has been about 4 to 5 m, for example. As a result, if the retaining wall height exceeds 4m to 5m, it will become the on-site retaining wall, or the bottom plate part will be formed shorter than the predetermined length, and a mechanical joint etc. will be attached and concrete will be cast on-site. (If the bottom plate is short, the stability at the time of installation is poor, and measures to prevent toppling, etc. are required.). If this happens, it will take a curing period until the strength of the concrete part cast in the field is developed, so it is compulsory to make full use of the advantage of shortening the construction period by applying precast products.

  In addition, if the construction site is a mountainous area, a place called so-called confined land with complicated topography, or a place where a necessary and sufficient area cannot be excavated due to conditions such as land boundaries, further restrictions are imposed. . Due to these factors, it may be difficult to apply the retaining wall made of the precast product as described above.

  In addition, when the construction site is soft ground, usually the pile is driven downward from the foundation concrete that is the foundation, and the upper end of this pile is engaged with the reinforcing bar in the foundation concrete to stabilize the foundation concrete. The measure of constructing “pile foundation” is taken. In other words, when the construction site is soft ground, reinforcing bars must be placed on the foundation concrete part as the foundation.

  This invention pays attention to such a malfunction, and it aims at providing the retaining wall which consists of precast concrete products with high applicability to a construction location and which can be constructed easily.

  In order to achieve such an object, the present invention takes the following measures.

That is, the retaining wall according to the first aspect of the present invention is a retaining wall made of a precast concrete product, and having a bottom slab whose one end is a free end and a vertical wall that is erected upward from the other edge of the bottom slab. The bottom plate is prohibited to move in the vertical direction while being partially embedded in the support layer to be installed, and the anchor body embedded in the support layer, the top and bottom fixed to the top of the anchor body fixing plate and an opening for mounting an anchor member that have a fastener for pressing them fixed plate in the vertical direction, the bottom plate movement inhibition surface on to prohibit movement of the upward direction and of the anchor with respect to the anchor member pairs comprising an anchor attachment portion having a lower movement inhibition surface to prohibit downward movement of the bottom plate for the member, write sandwiching bottom plate including the anchor attachment portion from upper and lower fixing plate of the anchor member In state, characterized in that it is installed.

  Here, the free end is a concept that does not include a concrete product such as a U-shape in which a vertical wall extends from both ends of the bottom plate or a rectangular ring with a top plate added. . That is, the retaining wall according to the present invention is a bottom plate and a vertical wall installed on a foundation such as foundation concrete in order to provide a vertical wall with a step having a predetermined dimension on the topography and an inclination exceeding the angle of repose of earth and sand. It refers to a retaining wall that is constructed so that a part of it is buried.

If this is the case, by providing an anchor mounting portion on the bottom plate, even if the size of the bottom plate extending from the lower end of the vertical wall is smaller than before, the support layer is prohibited from moving up and down. Since the upward movement of the bottom plate is prohibited with respect to the anchor member embedded in (3), it is possible to effectively improve resistance to sliding and falling. Even when the area where the soil can be excavated is smaller than before in the construction site, the problem of sliding and falling can be effectively avoided. In other words, it contributes to reducing the amount of excavated soil by reducing the area to be excavated. In addition, even when the ground to be installed is considered to be soft, the above-described action of the anchor member can more effectively avoid problems such as sliding and falling.
Moreover, since the anchor mounting portion has a lower movement prohibiting surface that prohibits downward movement relative to the anchor member, the adaptability to the soft ground can be further improved.
In addition, since the fasteners of the anchor member are inserted through the openings, the retaining wall can be manufactured more easily with a simple structure of the anchor mounting portion. Here, the number of openings is not limited. That is, various shapes can be applied depending on the shape and attachment mode of the anchor member.

The retaining wall according to the second aspect of the present invention is a retaining wall made of a precast concrete product, and having a bottom plate having one end as a free end and a vertical wall standing upward from the other end edge of the bottom plate. In addition, the bottom plate is prohibited from moving in the vertical direction in a state where the bottom plate is partially embedded in the support layer to be installed, and the opening for attaching the anchor member and the upward movement of the bottom plate relative to the anchor member are prohibited. An anchor mounting portion having an upper movement-inhibiting surface, and the anchor mounting portion is provided with an upper mounting plate at the upper end of the anchor body with nothing protruding on the upper surface side, and the anchor body is removed. A mortar is provided in a space below the upper mounting plate to fix the anchor member to a portion of the upper mounting plate that corresponds to the inner side of the outer periphery of the helical element. Be for attaching the anchoring member forming the mortar inlet for entry, and the opening for inserting the anchor body, the lower surface of the upper mounting plate provided on the upper side of the opening equivalent It is provided with the said upper movement prohibition surface which touches.
Even in this case, the most important effect of the present invention, that is, by providing the anchor attachment portion on the bottom plate, the size of the bottom plate extending from the lower end of the vertical wall can be made smaller than before. Further, since the upward movement of the bottom plate is prohibited with respect to the anchor member embedded in the state where the vertical movement is prohibited in the support layer, it is possible to effectively improve the resistance to sliding and falling. Even when the area where the soil can be excavated is smaller than before in the construction site, the problem of sliding and falling can be effectively avoided. In other words, it contributes to reducing the amount of excavated soil by reducing the area to be excavated. In addition, even if the ground to be installed is assumed to be soft, the effect of the above-described anchor member can provide an effect that the problem of sliding and falling can be more effectively avoided.

  Furthermore, the extension dimension of the bottom plate can be reduced, and as a result, the outer shape of the entire retaining wall, that is, the volume necessary for transporting the concrete product can be reduced. Thereby, the empty space produced when loading a retaining wall in a limited volume can be reduced. That is, according to this invention, the conveyance performance of the retaining wall which consists of precast products can be improved. That is, according to the present invention, it is possible to provide a retaining wall made of a precast concrete product that is highly applicable to construction sites and can be easily constructed.

  In order to make it easier to carry to the construction site by providing the above-described anchor attachment portion, it is preferable to set the size of the bottom plate to half or less of the size of the vertical wall. Thereby, not only efficient transportation by the compactness of the outer shape is performed, but also the weight of the retaining wall itself is reduced, and the installation becomes easier. Moreover, by effectively reducing the outer shape of the retaining wall itself, the storage space for storing the retaining wall can also be effectively reduced.

  In order to effectively improve not only the vertical movement of the bottom plate but also the horizontal movement, in particular, in order to more effectively improve the resistance to sliding, it is desirable to provide a plurality of anchor mounting portions. Thereby, the sliding which rotates in the horizontal direction centering on a single anchor member can also be prohibited effectively.

  As an arrangement to effectively prevent the anchor mounting part or anchor member from interfering with the series of work after installation and installation of the retaining wall, the anchor mounting part is located below the upper surface of the bottom plate. The structure which has the accommodation recessed part for positioning to can be mentioned.

  Here, the above-described retaining wall installation method according to the present invention for installing the retaining wall in the construction site includes an anchor embedding step of embedding an anchor member in the support layer to be installed, and a base on the support layer. Concrete placing process for placing concrete to provide concrete, retaining wall placing process for placing a retaining wall on the foundation concrete provided by the concrete placing process, and fastening the anchor member to the anchor mounting portion And an anchor tightening step.

  Here, in the retaining wall installation method according to the present invention, the anchor embedding process may be performed prior to placing the foundation concrete, or the anchor embedding process may be performed after the foundation concrete is disposed. In the latter case, it is preferable that the foundation concrete has a shape that does not interfere when anchors are embedded in the support layer.

  In order to install the retaining wall in a state where the anchor member is more stable, the anchor shaft is inserted into the support layer and the axial movement of the insert shaft portion is provided around the axis of the insert shaft portion with respect to the support layer. It is preferable that part of the insertion shaft part and part of the retaining part is arranged in the foundation concrete.

  As an aspect that can further promote the shortening of the construction period, which is an advantage of applying the retaining wall by the precast product by performing the above-described retaining wall installation more quickly, an aspect in which no reinforcing bars are arranged in the foundation concrete can be mentioned. it can. Even in such an embodiment, since the bottom plate and the anchor member are firmly engaged with each other, the retaining wall can be stably constructed even on a soft ground.

As an aspect of the anchor member that can be installed in a state where the bottom plate is more stabilized, an aspect in which the retaining portion is a spiral element formed in a spiral shape around the axis of the insertion shaft portion can be mentioned.

  According to the present invention, it is possible to provide a retaining wall made of a precast concrete product that has high applicability to construction sites and can be easily constructed.

1 is a schematic external view according to an embodiment of the present invention. Structure explanatory drawing which concerns on the same embodiment. Sectional drawing of the retaining wall which concerns on the same embodiment. Action | operation explanatory drawing which concerns on the same embodiment. Explanatory drawing which concerns on the modification of the embodiment. Structure explanatory drawing which concerns on the other modification of the embodiment. Same as above.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  The retaining wall Y, which is a precast concrete product according to the present embodiment, is used for construction at a construction location where a step is to be provided with an inclination greater than the angle of repose of earth and sand, for example, with respect to the terrain as shown in FIGS. It is. In the present embodiment, as an example, the retaining wall Y provided by vertically raising the vertical wall 5 from the bottom plate 4 is illustrated and described, but of course, the angle at which the vertical wall 5 is erected is limited. It is not a thing.

  The retaining wall Y is arranged on the foundation concrete SC. Specifically, it is arranged so that the edge is positioned, for example, about 10 cm inside from the edge of the foundation concrete SC placed on the support layer S. In addition, on the side where the vertical wall 5 is exposed, the earth and sand D are stacked so that the vertical wall 5 is buried 50 cm or more, for example. Although a floor mortar (not shown) is disposed on the upper surface of the foundation concrete SC, the configuration is well known and detailed description thereof is omitted. A specific mode in which the bottom plate 4 is arranged on the foundation concrete SC will be described later.

  In addition, above the bottom plate 4, earth and sand D are stacked up to the vicinity of the free end 5 a. Inside the earth and sand D, the water-stopping concrete WC is arranged below the drainage hole 53, and the crushed stone part ST is laminated on the waterstop concrete WC, so that smooth drainage from the drainage hole 53 is promoted. . Moreover, the drainage hole 53 provided in the vertical wall 5 is covered with the filter material F, thereby preventing unnecessary sediment D from flowing out.

  The vertical wall 5 has a dimension of 5 m or more, for example, and the other end exposed on the step surface while the earth and sand D on the one end side disposed on the bottom plate 4 is laminated to the vicinity of the free end 5a which is the upper end. On the side, the earth and sand D are laminated up to a place standing about 50 cm. In the vertical wall 5, the upper half portion including the free end is an upper wall portion 51 having a substantially equal thickness dimension, and the region from the lower end of the upper wall portion 51 to the bottom plate 4 is the bottom plate 4. The lower wall portion 52 is configured to gradually increase in thickness as it approaches, and the lower wall portion 52 is provided with the drain hole 53 that is an opening. Since the dimensions and shapes of the upper wall portion 51, the lower wall portion 52, and the drain hole 53 are appropriately set according to the situation of the construction site and the load expected after the construction, detailed description is omitted.

  In the bottom plate 4, for example, the extension length is set according to the set height of the vertical wall 5, but in the present embodiment, the length is 2 m to 2.5 m which is half or less of the dimension of the vertical wall 5. Have dimensions of the order. Further, the bottom plate 4 is buried in the earth and sand D with one end thereof being a free end 4a. Further, in the present embodiment, the bottom plate 4 is formed with a haunch 42 having a thick wall by inclining the upper surface of about 45 ° at the base end portion joined to the vertical wall 5. However, since the configuration of the bottom plate 4 is set as appropriate, like the vertical wall 5, the detailed description is omitted.

Here, the retaining wall Y according to the present embodiment has an opening for attaching the anchor member 1 whose bottom plate 4 is prohibited from moving in the vertical direction in a state where the bottom plate 4 is partially embedded in the support layer S to be installed. upcoming bolt insertion hole 33, serving movement inhibition surface on to prohibit upward movement of the bottom plate 4 with respect to the lower movement inhibition surface serving downward face 32 and the anchor member 1, prohibits the downward movement of the bottom plate 4 with respect to the anchor member 1 An anchor attachment portion 3 having an upward surface 31 is provided.

  Hereinafter, the configuration of the anchor attachment portion 3 will be described together with the configuration of the anchor member 1. 2 and 6 in the present embodiment, illustration of one anchor member 1 by a broken line is omitted.

  In this embodiment, the anchor mounting portion 3 is provided at the approximate center of the bottom plate 4 in the extending direction extending from the vertical wall 5, but of course, even if it is positioned at a position closer to the standing wall 5 than illustrated, Moreover, you may position in the free end 4a vicinity. Two anchor mounting portions 3 are provided at a predetermined interval with respect to the retaining wall Y which is a single precast concrete product. The anchor attachment portion 3 is, for example, four bolt insertion holes 33 that are openings for attaching the anchor member 1, and an upward movement-inhibiting surface that is clamped by the upper end portion of the anchor member 1 around the bolt insertion holes 33. An upwardly facing surface 31, a downwardly facing surface 32 that is a downward movement-inhibiting surface, and an accommodating recess 34 formed by recessing a part of the bottom plate 4 in order to position the upward surface below the top surface of the bottom plate 4. Have. Note that the downward surface 32 is flush with the lower surface of the bottom plate 4 in this embodiment. In other words, a region of the bottom plate 4 that is in contact with the anchor member 1 from below in the periphery where the bolt insertion hole 33 is formed is set on the downward surface 32. Moreover, in this embodiment, it further has the filling mortar 35 which coat | covers the said accommodation recessed part 34 after anchor member 1 attachment, and can be flush | planar with the upper surface of the bottom plate 4. FIG. Although the filling mortar 35 is schematically shown in the drawing, a detailed example thereof includes a mode in which the housing recess 34 is first filled with non-shrink mortar and the upper surface thereof is covered with an epoxy resin. Thereby, the anchor attachment part 3 or the anchor member 1 does not interfere with the operator's work during the work after the anchor member 1 is attached. Of course, the stuffing mortar 35 is not provided, and the housing recess 34 after the anchor member 1 is attached may be exposed as it is.

  The anchor member 1 attached to the anchor attaching portion 3 includes an anchor main body 10 embedded in the support layer S and a fixing plate that is fixed to the upper portion of the anchor main body 10 and sandwiched between the anchor attaching portion 3 from above and below. 11 and a fastening tool 12 for fastening these fixing plates 11 to press in the vertical direction. The anchor body 10 includes an insertion shaft portion 13 that is a steel rod formed with a sharpened tip, for example, and a retaining portion 14 formed around the axis of the insertion shaft portion 13. In this embodiment, as the retaining portion 14, a spiral element 17 having a substantially spiral plate shape that is spirally attached around the axis of the insertion shaft portion 13 is applied. The fixing plate 11 is formed integrally with the upper end of the anchor body 10 or is fixed to the lower fixing plate 16 having a lower bolt hole 16a that is arranged on the lower side of the bottom plate 4 and through which the bolt 12a is inserted. It has an upper fixing plate 15 that is formed separately from the anchor body 10 and is accommodated in the accommodation recess 34 from above and has an upper bolt hole 15a for inserting the bolt 12a. The tightening tool 12 has at least the upper end, in the example shown in the drawing, a bolt 12a that is male threaded at both ends, and a nut 12b that can be screwed into the bolt 12a. Existing bolts 12a and nuts 12b can be used as appropriate. Of course, although not shown, when the lower fixing plate 16 and the bolt 12a are connected, the nut 12b is not used and the fixing may be performed by welding.

  Thus, in the present embodiment, the retaining wall Y described above is installed while being fixed to the anchor member 1 that is positioned so as not to move in advance with respect to the support layer S and the foundation concrete SC. That is, in the installation method of the retaining wall Y according to the present embodiment, the anchor member 1 is embedded in the support layer S to be installed, and the anchor member 1 is embedded by this anchor embedding process. A concrete placing process in which concrete is placed to provide the foundation concrete SC on the support layer S, and the anchor attachment portion 3 is engaged with the anchor member 1 exposed on the foundation concrete SC provided by the concrete placing process. A holding wall placing step for placing the retaining wall Y and an anchor fastening step for fastening the anchor member 1 to the anchor mounting portion 3 are provided.

  That is, the retaining wall Y is attached as shown in FIG. 4 by the installation method according to the present embodiment. That is, as shown in the figure, a bolt 12a in which a part of the insertion shaft portion 13 and the retaining portion 14 is arranged in the foundation concrete SC and a nut 12b is screwed to the lower side (not shown) is inserted into the lower bolt hole 16a. The anchor member 1 is arranged so that the upper surface of the lower fixing plate 16 in the inserted state is flush with the surface of the foundation concrete SC. In other words, in the anchor embedding step, the anchor member 1 is lowered by the action of the spiral shape while the anchor body 10 rotates around the axis with respect to the support layer S before the foundation concrete SC is placed. Buried in At this time, the anchor body 10 is in a state where only a part of the upper end is exposed from the support layer S. Thereafter, the foundation concrete SC is driven to the height of the upper surface of the lower fixing plate 16. In detail, fine adjustment of the upper surface is performed by a non-illustrated mortar. In this embodiment, since the reinforcing bars are not arranged in the foundation concrete SC, the foundation concrete SC can be placed quickly.

  By adopting the configuration as described above, the retaining wall Y according to the present embodiment has a dimension in which the bottom plate 4 extends from the lower end of the vertical wall 5 by providing the anchor mounting portion 3 on the bottom plate 4. However, since the vertical movement of the bottom plate 4 is prohibited with respect to the anchor member 1 embedded in the support layer S in a state where the vertical movement is prohibited, the resistance against the sliding and falling of the retaining wall Y is effectively achieved. Can be improved. That is, even if the area where the soil can be excavated is smaller than before, the problem of sliding and falling is effectively avoided. In other words, it contributes to reducing the amount of excavated soil by reducing the area to be excavated. In addition, even when the ground to be installed is assumed to be soft, the above-described action of the anchor member 1 can more effectively avoid the problems of sliding and falling.

  In this embodiment, the size of the bottom plate 4 is set to be equal to or less than half the size of the vertical wall 5 in order to make it easier to carry to the construction site. Thereby, not only the highly efficient conveyance by the compactness of the outer shape is performed, but also the retaining wall Y itself is reduced in weight, and installation is easier. In addition, by effectively reducing the outer shape of the retaining wall Y itself, the storage space for storing the retaining wall Y is also effectively reduced.

  That is, as a result of reducing the extension dimension of the bottom slab 4, it is possible to reduce the outer shape of the entire retaining wall Y, that is, the volume necessary for transporting the concrete product. Thereby, it contributes to making the empty space produced when loading the retaining wall Y in the limited volume small, and improving the conveyance performance of the retaining wall Y. That is, according to this embodiment, provision of the retaining wall Y which consists of a precast concrete product with high applicability to a construction location and which can be easily constructed is realized.

  In this embodiment, a plurality of anchor mounting portions 3 are provided in order to effectively improve not only the vertical movement of the bottom plate 4 but also the horizontal movement, and more effectively improving the resistance to sliding. It is said. Thereby, the sliding which rotates to the horizontal direction centering on the single anchor member 1 is also prohibited effectively.

  In the present embodiment, the anchor mounting portion 3 or the anchor member 1 is arranged on the anchor mounting portion 3 as a configuration for effectively avoiding interference with a series of operations after the installation and construction of the retaining wall Y. An accommodation recess 34 for positioning the upper end below the upper surface of the bottom plate 4 is provided.

  By providing the bolt insertion hole 33 so that the anchor mounting portion 3 can be fixed to the anchor member 1 by the bolt 12a and the nut 12b which are the fasteners 12, the retaining wall Y can be installed more quickly and accurately. ing. Further, in this embodiment, the anchor member 1 has the spiral element 17, and when the technique of rotating the spiral element 17 around the axis of the shaft insertion portion when being embedded in the support layer S, the lower fixing plate is used. There is also a possibility that the position of the bolt 12a arranged in advance in the position 16 and the position of the bolt insertion hole 33 are shifted. Therefore, in this embodiment, instead of the illustrated bolt insertion hole 33, for example, a bolt insertion hole 33 having a curved shape around the axis of the shaft insertion portion may be provided.

  In the present embodiment, the anchor mounting portion 3 is positioned at the center of the bottom plate 4 in the extending direction of the bottom plate 4. However, in order to more stably install the bottom plate 4, the anchor mounting portion 3 is provided. If it is brought close to the wall 5, the downward surface 32 as the downward movement prohibiting surface effectively acts, and the resistance to the load from above can be increased. Further, if the anchor attachment portion 3 is provided close to the free end 4a, the upward surface 31 which is the upward movement prohibiting surface effectively acts to increase the pull-out resistance and further increase the resistance to falling.

  Here, the installation method of the retaining wall Y according to this embodiment for quickly and surely installing the retaining wall Y described above in the construction site is to embed the anchor member 1 in the support layer S that is the installation target for installing the retaining wall Y. Anchor placing step, concrete placing step for placing concrete to provide the foundation concrete SC on the support layer S in which the anchor member 1 is buried by this anchor embedding step, and foundation concrete provided by this concrete placing step A retaining wall placing step for placing the retaining wall Y so that the anchor attaching portion 3 is engaged with the anchor member 1 exposed on the SC; and an anchor fastening step for fastening the anchor member 1 to the anchor attaching portion 3. It is supposed to be.

  In addition, in order to install the retaining wall Y in a state where the anchor member 1 is more stable, in the present embodiment, the insertion shaft portion 13 into which the anchor member 1 is inserted into the support layer S and the shaft of the insertion shaft portion 13 It has a retaining part 14 provided around the center for prohibiting axial movement relative to the support layer S, and a part of the insertion shaft part 13 and the retaining part 14 is arranged in the foundation concrete SC. I am doing so.

  In particular, in the present embodiment, in order to further promote the shortening of the work period including the installation of the retaining wall Y, a mode in which no reinforcing bars are arranged in the foundation concrete SC is applied. That is, even if it is such an aspect, since the bottom plate 4 and the anchor member 1 are firmly engaged, the retaining wall Y can be stably constructed even in a soft ground.

  In the present embodiment, as one aspect of the anchor member 1 in which the bottom plate 4 can be installed in a more stable state and can be easily embedded in the support layer S, the retaining portion 14 spirals around the axis of the shaft insertion portion. The spiral element 17 is formed in a shape.

<Modification 1>
Hereinafter, each modification of the present embodiment will be described. In addition, about these modification, while attaching | subjecting the same code | symbol to what is corresponded to the component of the said embodiment, the detailed description is abbreviate | omitted.

  In the above embodiment, the anchor member 1 having the spiral element 17 to be embedded in the support layer S is applied. However, an anchor as shown in FIG. The member 1 may be applied. The left side of the figure shows that a standing element 18 bulged in a roughly nodal shape is applied to the insertion shaft portion 13 in place of the spiral element 17 so as to intermittently increase the diameter. The right side of the figure is the same as the vertical element 18 in that the diameter is intermittently increased with respect to the insertion shaft portion 13 instead of the spiral element 17, but the apex in the sectional view from the insertion shaft portion 13 is the same. An embodiment is shown in which a wedge element 19 is provided which is bulged in a triangular shape displaced upward.

  Even if it is such, there exists an effect similar to the said embodiment except the point which can be inserted while rotating at the time of insertion.

<Modification 2>
Subsequently, in the present modification, as shown in FIG. 6, a mode in which the anchor attachment portion 3 does not have the accommodation recess 34 is illustrated. That is, in this modification, the aspect which comprised the anchor attachment part 3 only by providing the bolt insertion hole 33 which can insert the volt | bolt 12a with respect to the bottom plate 4 is disclosed. If it is such, it has the further advantage from the said embodiment by the point which not only has the effect similar to the said embodiment but can form the anchor attachment part 3 easily. It should be noted that the bolt insertion hole 33 shown in the figure may also be provided with a bolt insertion hole 33 having a curved shape around the shaft center in order to allow the shaft insertion portion to be arranged around the shaft center, as in the above embodiment. Not too long.

<Modification 3>
Moreover, although the said embodiment and each modification disclosed the aspect in which the anchor attaching part 3 was equipped with both the upward surface 31 which is an upward movement prohibition surface, and the downward surface 32 which is a downward movement prohibition surface, of course, it concerns on this invention. The anchor attachment portion 3 may have a mode in which only the upward surface 31 that is the upward movement prohibition surface is provided without the downward surface 32 that is the downward movement prohibition surface.

  That is, in this modified example, as shown in FIG. 7, a single anchor insertion hole 36 through which the anchor main body 10 of the anchor member 1 can be inserted is provided on the bottom plate 4 side as an opening instead of the bolt insertion hole 33. An upward surface 31 is provided above the insertion hole 36. In other words, the stepped portion provided at the intermediate position of the housing recess 34 is the upward surface 31.

  The anchor member 1 has a shape in which a disk-like upper fixing plate 15 is provided on the upper end of the anchor main body 10 similar to the above-described embodiment, for example, by welding or the like. The upper fixing plate 15 does not have the upper bolt hole 15a as in the above embodiment. Instead, the upper fixing plate 15 is formed with a mortar inlet 15b for filling the mortar 35 in a downward direction, for example, at one location.

  In addition, in the installation method of the retaining wall Y shown in the above embodiment and each modification, the anchor burying step is performed prior to placing the foundation concrete SC, but in this modification, after the foundation concrete SC is placed. The anchor burying process is performed. In this case, in the embodiment shown in the figure, an opening or a notch (not shown) is formed in advance in the base concrete SC so as not to interfere when the anchor member 1 is embedded. Then, after burying the upper fixing plate 15 of the anchor member 1 to a position where the upper fixing plate 15 is in contact with or substantially in contact with the upper surface 31, the mortar 35 is injected into the mortar inlet 15 b provided in the upper fixing plate 15. That is, the filling mortar 35 acts as a fastening tool according to the present invention that is replaced by the fastening tool composed of the bolt 12a and the nut 12b of the above embodiment, and the step of injecting the filling mortar 35 corresponds to an anchor fastening process.

  Although not shown, it is desirable that the top surface of the bottom plate 4 and the filling mortar 35 be flush with each other, but only the uppermost surface of the housing recess 34 may be separately coated with an epoxy resin or the like.

  Even if it is such, the sliding of a retaining wall and a fall can be suppressed effectively like the said embodiment and each modification.

  Although the embodiment of the present invention has been described above, the specific configuration of each unit is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, in the above-described embodiment, the anchor attachment portion provided with four bolt insertion holes of the anchor attachment portion and the anchor member in the anchor attachment portion are disclosed, but this does not limit the number of bolt insertion holes. That is, you may use the anchor attachment part which has a single volt | bolt penetration hole, and the anchor member corresponding to it. In this case, specifically, a mode in which a single bolt insertion hole is provided at the center of the housing recess is also included.

  In the above embodiment, since the fixing plate for attaching the anchor mounting portion sandwiches the bottom plate from above and below, the upper movement prohibited surface is formed at the upper end and the lower movement prohibited surface is formed at the lower end. In this case, the positions where the upper movement prohibited surface and the lower movement prohibited surface are formed are different, and it is not always necessary to configure them as a plane. In addition, for example, in the above-described embodiment, the aspect in which the anchor attachment portion is provided at the center in the extending direction of the bottom plate is disclosed, but as described above, for example, when prevention of overturning is considered more important, the anchor attaching portion is at the center in the extending direction. The anchor attachment portion may be arranged closer to the wall than the center in the extending direction when the resistance to the load is more important. In addition, in the above-described embodiment and each modification, the anchor mounting portion is shown separately for only the upper movement prohibited surface and the one having the upper and lower movement prohibited surfaces. Of course, both of these anchor mounting portions are single. It may be provided on the retaining wall at the same time. Further, specific aspects such as the dimensions and specific shapes of the vertical wall and the bottom plate are not limited to those of the above-described embodiment, and various aspects including the existing ones can be applied.

  In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

  The present invention can be used as a retaining wall that is partially embedded in soil when a road or the like is constructed.

DESCRIPTION OF SYMBOLS 1 ... Anchor member 3 ... Anchor attaching part 31 ... Up movement prohibition surface (upward surface)
32 ... Downward movement prohibited surface (downward surface)
33 ... Opening 4 ... Bottom plate 4a ... Free end 5 ... Vertical wall 5a ... Free end Y ... Retaining wall

Claims (9)

A retaining wall made of a precast concrete product, having a bottom plate whose one end is a free end, and a vertical wall erected upward from the other end edge of the bottom plate,
The bottom plate is prohibited from moving in the vertical direction in a state where a part of the bottom plate is embedded in the support layer to be installed, and forms an anchor body embedded in the support layer and a pair of upper and lower fixed to the upper portion of the anchor body. An opening for attaching an anchor member having a fixing plate and a fastener that presses the fixing plate in the vertical direction, an upper movement prohibiting surface for prohibiting upward movement of the bottom plate relative to the anchor member, and an opening of the bottom plate relative to the anchor member An anchor mounting portion having a lower movement prohibiting surface that prohibits downward movement,
A retaining wall, wherein the bottom plate including the anchor attachment portion is installed in a state where the bottom plate is sandwiched from above and below by a fixing plate of the anchor member. A retaining wall made of a precast concrete product, having a bottom plate whose one end is a free end, and a vertical wall erected upward from the other end edge of the bottom plate,
When the bottom plate is partially embedded in the support layer to be installed, movement in the vertical direction is prohibited, and an opening for attaching the anchor member and the upward movement of the bottom plate with respect to the anchor member are prohibited. Comprising an anchor mounting portion having a movement-prohibited surface;
The anchor mounting portion is provided with an upper mounting plate with nothing protruding on the upper surface side at the upper end of the anchor main body, and the anchor main body has a spiral element constituting a retaining portion, and For attaching the anchor member forming a mortar injection port for injecting mortar into the space below the upper mounting plate to fix the anchor member to a portion corresponding to the inner side of the outer periphery of the spiral element The opening for inserting the anchor main body and the upper movement prohibiting surface provided on the upper side of the opening and abutting against the lower surface of the upper mounting plate are provided. wall. The retaining wall according to claim 1 or 2, wherein a dimension of the bottom plate is set to be not more than half of a dimension of the vertical wall. The retaining wall according to claim 1, wherein the retaining wall includes a plurality of the anchor attachment portions. The retaining wall according to claim 1, 2, 3, or 4, wherein the anchor attaching portion has a housing recess for positioning the upper end of the anchor member below the upper surface of the bottom plate. A retaining wall installation method for installing the retaining wall according to claim 1 to a construction site,
An anchor embedding step of embedding an anchor member in a support layer that is a target for installation of a retaining wall, and a concrete placing step of placing concrete to provide foundation concrete in the support layer;
A retaining wall placing step of placing the retaining wall on the foundation concrete provided by the concrete placing step;
An anchor tightening step for tightening the anchor member fixing plate so as to be sandwiched and attached to the anchor attaching portion from above and below. The anchor member includes an insertion shaft portion to be inserted into the support layer, and a retaining portion provided around the axis of the insertion shaft portion to prohibit axial movement with respect to the support layer. The retaining wall installation method according to claim 6, wherein a part of the shaft portion and the retaining portion is disposed in the foundation concrete. The method for installing a retaining wall according to claim 7, wherein no reinforcing steel is provided in the foundation concrete. The retaining wall installation method according to claim 7 or 8, wherein the retaining portion is a spiral element formed in a spiral shape around the axis of the insertion shaft portion.

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