JP2018048522A - Earth retaining material, and construction method earth retaining material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an earth retaining material having a structure with enhanced close contact performance to the natural ground to thereby reduce the earth soil thickness while reducing drilling soil volume and construction cost, and a construction method of earth retaining material.SOLUTION: The construction method of the earth retaining material includes the steps of: impregnating a hardening resin 3 into gaps in a retaining sheet 2 which is formed in a sheet having impregnable gaps; manufacturing an earth retaining material 1 by hardening the hardening resin 3 using hardening means; and disposing the earth retaining material 1 along the natural ground.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an earth retaining member using a curable resin, and a construction method of the earth retaining member.

  Conventionally, as a retaining member, for example, as shown in Patent Document 1, a retaining plate such as a steel sheet pile is directly applied to an excavation hole in which a natural ground is dug down during excavation, and a cut beam or an erection material is installed. The structure to do is common.

Japanese Patent Application Laid-Open No. 2015-074950

However, the conventional earth retaining member described above has the following problems.
In other words, the steel sheet piles that make up the conventional earth retaining plate described above are made of metal, so it is difficult to place the steel sheet piles in close contact with the natural ground, and the surroundings of structures such as concrete foundations constructed in the excavated drill holes It was necessary to secure sufficient construction space. In addition, since the retaining plate is generally used as a temporary structure, it has been necessary to remove the retaining plate after the construction of the structure.
That is, as shown in FIG. 10, as a space between the deep ground G and the structure K, in addition to the above-described arrangement space of the retaining plate 100, the arrangement space of the outer mold frame 101 for placing concrete Is also required. For this reason, since the amount of excavated soil (the amount of surplus excavation) of the natural ground to be dug increases, it is required to reduce the surplus excavation and reduce the construction cost, and there is room for improvement in that respect.

  The present invention has been made in view of the above-described problems, and it is possible to reduce the amount of excavated soil by providing a structure in which the earth retaining thickness can be reduced and the adhesion to the natural ground is enhanced. An object of the present invention is to provide an earth retaining member capable of suppressing an increase in construction cost and a construction method for the earth retaining member.

  In order to achieve the above object, the earth retaining member according to the present invention is an earth retaining member arranged along a natural ground, and a base material having a gap that can be impregnated and a gap between the base material are impregnated. And a curable resin to be cured.

  Moreover, the construction method of the earth retaining member according to the present invention is a construction method of the earth retaining member arranged along the natural ground, and the step of impregnating the curable resin into the gap of the base material having the gap that can be impregnated. And a step of placing the base material impregnated with the curable resin in close contact with the natural ground, and using a curing means to cure the curable resin impregnated in the arranged base material. And a step of forming an earth retaining member.

In the present invention, for example, a structure is obtained by impregnating a curable resin into a gap of a base material having a gap that can be impregnated, such as paper, and curing, and a predetermined strength is provided even if the earth retaining member is thinned into a sheet shape be able to. Furthermore, since the base material in a state before being cured by impregnating the curable resin has flexibility, it is possible to place the base material in this state in close contact with the excavated ground and to arrange the earth retaining Spaces can be omitted. Therefore, it is possible to eliminate the amount of ground excavation for earth retaining arrangement, and it is possible to suppress an increase in construction cost. In addition, although the earth retaining member has a thickness of about 1 mm, for example, it can be said that there is substantially no arrangement space for the earth retaining and an excessive amount of excavation for the earth retaining arrangement.
Further, when the earth retaining member is disposed on the entire surface of the ground where the earth retaining is performed, it can also be used as an outer formwork at the time of placing concrete of a structure constructed inside the excavation hole. In this case, in addition to being able to omit the earth retaining arrangement space, the outer mold frame is not required to be arranged. Can be suppressed.

  In the earth retaining member according to the present invention, the base material may be an earth retaining sheet formed in a sheet shape.

  In this case, by using a sheet-like earth retaining sheet, it is possible to realize a lighter and extremely thin earth retaining member compared to the case of a conventional steel sheet pile, etc. The working efficiency at the time of arranging along can be improved.

  In the earth retaining member according to the present invention, the curable resin is preferably applied to the surface of the earth retaining sheet.

  In this case, since the curable resin is applied and exposed on the surface of the earth retaining sheet, the operation of curing the curable resin using the curing means can be easily performed. Therefore, it is possible to make a device for manufacturing the earth retaining member, and after placing only the earth retaining sheet along the ground at the construction site, it is cured after applying a curable resin to the surface of the earth retaining sheet. It is also possible to manufacture at the construction site.

  In the earth retaining member according to the present invention, the curable resin is preferably a two-component curable resin that is cured by a two-component reaction.

  With such a configuration, after the upper layer part of the two-part curable resin is cured, the resin inside the cured upper layer part is cured by a two-part reaction, so not only from the outside but also from the inside Can be more reliably cured, and the strength of the earth retaining member can be increased.

  Here, depending on the purpose of use, the curable resin is classified into a material that permanently contributes to improving the waterproof performance of the remaining structure in the ground, and a material that is left in the soil as a temporary material and is naturally decomposed in the future. Is done.

  The earth retaining member according to the present invention is preferably formed from a material that can be naturally decomposed.

  In this case, since the earth retaining member is naturally decomposed, it can be left as it is and buried in the ground after being used as earth retaining. This eliminates the need for removal work, thereby reducing the work period and cost.

  In the earth retaining member according to the present invention, it is preferable that the curable resin has water stopping performance.

  In this case, since the earth retaining member has water-stopping performance, the effect as a water-stopping material for preventing leakage of groundwater and the like can be expected. Conversely, storage equipment such as liquid can also contribute to prevention of leakage of stored items.

  Moreover, as for the earth retaining member which concerns on this invention, it is preferable that the said base material has an unevenness | corrugation formed.

  In this case, the strength of the entire retaining member can be increased by forming, for example, corrugated irregularities on the retaining member.

  Moreover, the construction method of the earth retaining member according to the present invention is a construction method of the earth retaining member arranged along the natural ground, and the step of arranging a base material having a gap that can be impregnated along the natural ground And a step of impregnating a curable resin into a gap between the base materials disposed on the ground, and a step of curing the curable resin using a curing means.

  In the present invention, for example, a sheet retaining member that is impregnated with a curable resin in a gap of a base material having a gap that can be impregnated, such as paper, and cured by a curing means is manufactured. The strength of can be given. And in the present invention, in the manufactured earth retaining member, it is possible to arrange it in close contact with the ground excavated in a state having flexibility before the curable resin is completely cured. Spaces can be omitted. Therefore, it is possible to eliminate the amount of ground excavation for earth retaining arrangement, and it is possible to suppress an increase in construction cost.

  According to the earth retaining member and the construction method of the earth retaining member of the present invention, the earth retaining thickness can be reduced and the structure having improved adhesion to the natural ground can reduce the amount of excavated soil. And increase in construction cost can be suppressed.

It is a side view which shows the installation state of the earth retaining member by the 1st Embodiment of this invention. It is a fragmentary sectional view of the earth retaining member, (a) is a figure showing the state before hardening of curable resin, and (b) is a figure showing the state after hardening of curable resin. (A), (b) is a fragmentary sectional view which shows the corrugated plate-shaped uneven part formed in the earth retaining sheet. (A)-(d) is a side view which shows the construction method of the earth retaining member by 1st Embodiment. (A) is an enlarged view of the main part of FIG. 4 (b), and is a side view in which the earth retaining member in a state in which the earth retaining sheet is impregnated with the curable resin is arranged along the excavation side wall; It is the principal part enlarged view of FIG.4 (c), Comprising: It is a side view of the state which irradiated and hardened | cured ultraviolet rays to curable resin. (A), (b) is a side view which shows the construction method of the structure following FIG.4 (d). It is a side view which shows schematic structure of the manufacturing apparatus by 2nd Embodiment. (A)-(d) is a side view which shows the construction method of the earth retaining member by 2nd Embodiment, and the construction method of a structure. It is a side view which shows schematic structure of the manufacturing apparatus by a modification. It is a side view which shows the construction method of the structure embed | buried under the conventional ground.

  Hereinafter, the earth retaining member and the construction method of the earth retaining member according to the embodiment of the present invention will be described based on the drawings.

(First embodiment)
As shown in FIGS. 1 and 2, the earth retaining member 1 according to the first embodiment is an excavation in which a natural ground G is dug when a structure K (see FIG. 6B) is built in the ground. It is made to abut against the excavation side wall Ga of the hole and is used as a earth retaining supported by the cut beam 51 and the erection material 52.
As shown in FIGS. 2 (a) and 2 (b), the earth retaining member 1 includes an earth retaining sheet 2 (base material) formed in a paper sheet shape with a gap (not shown) that can be impregnated. After being applied to one surface 2a of the earth retaining sheet 2 (the state shown in FIG. 2 (a)), the curing provided in a state where the earth retaining sheet 2 is impregnated and cured (the state shown in FIG. 2 (b)). And a functional resin 3.
Here, in the earth retaining member 1, the curable resin 3 is applied to one surface 2 a of the earth retaining sheet 2, and the impregnated state is denoted as 1 </ b> A, before the impregnated curable resin 3 is cured or completely cured. This state is denoted by reference numeral 1B.

The earth retaining sheet 2 is made of a paper member that can be naturally decomposed depending on the purpose of use, and is formed in an arbitrary size and shape. Specifically, when the earth retaining sheet 2 is manufactured as the earth retaining member 1 by using a manufacturing apparatus 4 (see FIG. 7) as described later, the earth retaining sheet 2 is manufactured in a long continuous belt shape and has an appropriate length. Disconnected. As the earth retaining sheet 2, for example, Japanese paper or cardboard having a thickness of about 1 mm can be used. In addition, the clearance gap between the earth retaining sheets 2 mentioned above means the fibrous clearance which comprises paper.
Here, as shown to Fig.3 (a), (b), the corrugated sheet | seat 2 may be formed with the corrugated-like uneven part 2c which consists of a continuous curve or has a top part.

  The curable resin 3 shown in FIG. 2 is a resin that is impregnated into the gap of the earth retaining sheet 2 and is cured. For example, a thermosetting resin, a photo-curable resin, or the like is employed, and is the same as the earth retaining sheet 2. The resin is preferably a resin that can be naturally decomposed depending on the purpose of use.

Examples of thermosetting resins include unsaturated polyester resins and epoxy resins having thermosetting properties.
Further, as an example of the photocurable resin, a known ultraviolet (UV) curable resin, a visible light curable resin, an ultraviolet curable silicone resin, or the like can be used. These photocurable resins are cured by, for example, irradiating the curable resin 3 applied to the earth retaining sheet 2 with ultraviolet rays using, for example, an LED line type UV irradiator UD40SERIES (manufactured by Panasonic Device Sales Co., Ltd.). Can do.

  As the ultraviolet curable resin, for example, an ultraviolet curable two-component curable resin 3A (see FIG. 7 described later) that is cured by a two-component reaction such as “3088”, “3088B”, or “30Y221” manufactured by ThreeBond is used. be able to. The above-mentioned “30Y221” two-component curable resin is applied to a portion to be applied (the earth retaining sheet 2 in the present embodiment) using a dispenser that mixes two liquids of the main agent and the hardener immediately before jetting. . This agent is a purple transparent liquid, and the curing agent is a colorless transparent liquid, each having a viscosity of 25 Pa · s, a thixotropy of 2.45, and a gel time of 15 minutes at 25 ° C. In this two-component curable resin, the upper layer portion irradiated with ultraviolet rays is cured in a few seconds, and then the inner portion of the cured upper layer portion is cured by a two-component reaction in a few minutes, and is completely completed in 10 to 15 minutes. Can be cured. The two-component reaction at this time is an oxidation-reduction reaction, and curing is accelerated by the reaction heat of the ultraviolet curing part.

Next, the manufacturing method of the earth retaining member 1, the construction method for earth retaining using the earth retaining member 1, and the construction method of the structure K will be described in detail with reference to the drawings.
As shown in FIG. 4A, first, in a construction site, a state where the excavation side wall Ga is exposed by digging a excavation hole for constructing the structure K (see FIG. 6B) with a predetermined width. To do. The excavation hole at this time is excavated with an excessive amount of excavation that corresponds to the thickness of the retaining member 1 (which corresponds to the thickness of the retaining member 1). That is, the symbol E in FIG. 4A indicates a position (main line) outside the structure K, and an area between the main line E and the excavation side wall Ga is an extra excavation region. Here, the earth retaining member 1 of the present embodiment has a thickness of about 1 mm, and can be handled as having no thickness as the earth retaining member, and therefore, between the main line E and the excavation side wall Ga. It can be understood that there is no excess excavation area (excess excavation amount).

  Subsequently, as shown in FIG. 4 (b), the earth retaining member 1A in which the earth retaining sheet 2 is impregnated with the curable resin 3 is adhered to the entire surface along the excavation side wall Ga of the excavated natural ground G. Arrange in the state of letting At this time, as shown in FIG. 5 (a), since the retaining member 1A having flexibility can be arranged on the excavation side wall Ga, it becomes possible to arrange it following the irregular uneven shape of the excavation side wall Ga, Adhesion can be increased. Note that the earth retaining member 1A at this time does not need to be embedded in the bottom of the excavation.

Next, as shown in FIG. 4C, when the curable resin 3 is an ultraviolet curable resin, a UV irradiator (curing means) (not shown) is provided over the entire surface of the earth retaining member 1A installed on the excavation side wall Ga. ) Is used to cure the impregnated curable resin 3, and as shown in FIG. 5 (b), the earth retaining material having a predetermined strength cured in a state of being in close contact with the excavation side wall Ga. Member 1B is formed.
Thereafter, by installing the cut beam 51 and the erection material 52, the earth retaining work is completed. The earth retaining member 1 is pressed only by the cut beam 51 and the erection material 52, but may be fixed to the natural ground G using a fixing means such as an anchor, or the cut beam 51 and the belly member Until the raising material 52 is installed, temporary fixing may be performed with an anchor or the like.

  Next, in the present embodiment, as shown in FIG. 6A, the retaining member 1 used as a retaining member is used as an outer mold for placing concrete in the structure K. First, after the foundation concrete 53 is installed at the bottom of the excavation hole, the bottom slab 54 of the structure K is placed in the concrete. Subsequently, the earth retaining member 1B is used as the outer mold, and the inner mold 56 is installed on the bottom plate 54 with an interval corresponding to the thickness of the side wall 55 of the structure K. Concrete C is placed in

  Then, after the cast concrete C is cured and reaches a predetermined strength and hardened, as shown in FIG. 6B, the inner mold 56 is removed and the bottom plate 54 and the side wall 55 embedded in the ground. The structure K comprised from these will be constructed.

Next, the effect | action of the construction method of the earth retaining member 1 and the earth retaining member 1 mentioned above is demonstrated in detail using drawing.
In the present embodiment, as shown in FIG. 1 and FIG. 2 (a), it is a structure in which a curable resin 3 is impregnated and cured in a gap of the earth retaining sheet 2 having a paper-impregnable gap, Even if the earth retaining member 1 is thinned into a sheet shape, a predetermined strength can be obtained. Furthermore, since the earth retaining sheet 2 (the earth retaining member 1A) in a state before being impregnated with the curable resin 3 has flexibility, the earth retaining member is attached to the ground G obtained by excavating the earth retaining sheet 2 in this state. 1 can be placed in close contact with each other, and the space for placing the earth retaining can be eliminated. Therefore, the amount of surplus digging of the natural ground G can be omitted, and an increase in construction cost can be suppressed.
And in this Embodiment, it is a sheet-like earth retaining sheet 2 and can implement | achieve a light and thin earth retaining member compared with the case of the conventional steel sheet pile etc., and it is easy to convey. The work efficiency at the time of arranging along the natural ground G can be improved.

  Moreover, in this Embodiment, since the earth retaining member 1 is arrange | positioned in the whole side wall of the natural ground G which performs earth retaining, the outer formwork at the time of placement of the concrete C of the structure K constructed inside an excavation hole Can also be used. In this case, in addition to being able to omit the earth retaining space, the space for the outer mold is not required, so the amount of extra digging can be omitted compared to the case of providing the outer mold, and further construction costs can be reduced. Can be suppressed.

  Furthermore, in the earth retaining member 1 of the present embodiment, since the curable resin 3 is applied and exposed on the surface 2a of the earth retaining sheet 2, the curable resin 3 is used by using a predetermined curing means. The work of curing can be easily performed.

  Furthermore, in the present embodiment, after the upper layer portion of the two-component curable resin 3A (see FIG. 7) is cured, the resin inside the cured upper layer portion is cured by a two-component reaction. Not only the curing but also the interior can be more reliably cured, and the strength of the earth retaining member 1 can be increased.

  Moreover, when the earth retaining member 1 of the present embodiment is to be naturally decomposed, it can be left as it is and buried in the ground after being used as a earth retaining. This eliminates the need for removal work, thereby reducing the work period and cost.

  In this embodiment, since the curable resin 3 has biodegradability, even if it is left in the ground as it is after the use as a soil retaining, it is possible to construct another structure in the near future. When necessary, the earth retaining member 1 can be easily broken.

  Moreover, in this Embodiment, the whole intensity | strength of the earth retaining member 1 can be raised by forming the corrugated uneven | corrugated | grooved part 2c as shown to FIG. 3 (a), (b) in the earth retaining sheet 2. FIG. it can.

  As described above, according to the earth retaining member using the curable resin and the construction method of the earth retaining member according to the present embodiment, the earth retaining thickness can be reduced and the adhesion to the natural ground G is improved. Thus, the amount of excavated soil can be reduced, and an increase in construction cost can be suppressed.

(Second Embodiment)
Next, the construction method of the earth retaining member 1 according to the second embodiment will be described with reference to FIGS.
2nd Embodiment manufactures the earth retaining member 1 using the manufacturing apparatus 4 shown in FIG. 7, and shows the earth retaining member 1 before hardening manufactured by this manufacturing apparatus 4 in FIG.8 (b). It is the construction method installed along the excavation side wall Ga which excavated the natural ground G in the field.

First, an example of the manufacturing apparatus 4 when using the two-component curable resin 3A will be described with reference to FIG.
The manufacturing apparatus 4 uses a two-component curable resin 3A (curing property) on the surface 2a (upper surface in FIG. 7) of the earth retaining sheet 2 unwound from the earth retaining sheet roll 2A in which the earth retaining sheet 2 is wound in a roll shape. Resin 3) is applied, and earth retaining sheet 2 is impregnated with two-component curable resin 3A to produce earth retaining member 1A (1).

  Specifically, the manufacturing apparatus 4 ejects the two-component curable resin 3A from the upstream side to the downstream side in the unwinding direction X with respect to the earth retaining sheet 2 unwound from the earth retaining sheet roll 2A. A dispenser 41 is arranged. A roller 42 for moving the earth retaining sheet 2 in the unwinding direction X is provided on the upstream side or the downstream side of the dispenser 41.

  Here, the manufacturing apparatus 4 includes a cutting unit (not shown), and the earth retaining member 1 continuously manufactured in the unwinding direction X can be cut to a predetermined length. Alternatively, roll up the retaining member 1 continuously produced in the unwinding direction X, and bring it into a construction site, cut it to the required length at the construction site, and use it. May be.

In the second embodiment, as shown in FIG. 7, the manufacturing apparatus 4 applies the curable resin 3 to the surface 2a of the earth retaining sheet 2 having a gap that can be impregnated by the dispenser 41, thereby retaining the earth retaining. The earth retaining member 1 </ b> A is manufactured by impregnating the gap between the sheets 2 with the curable resin 3.
As described above, in the second embodiment, for example, the earth retaining member 1A may be manufactured in advance in a factory or the like where the manufacturing apparatus 4 is installed, and then carried into the construction site, or the manufacturing apparatus 4 may be installed near the construction site. It may be installed and the earth retaining member 1A may be manufactured and used as it is at the construction site.

And in the construction site, while preparing the earth retaining member 1B before hardening manufactured with the manufacturing apparatus 4, as shown to Fig.8 (a), the structure K (refer FIG.8 (d)) is constructed | assembled. Drill a drilling hole with a predetermined width. Excavation amount of the excavation hole at this time is also excavated with an extra excavation amount equivalent to the thickness of the retaining member 1 (corresponding to the thickness dimension of the retaining member 1), as in the first embodiment. Is done. That is, construction without an excessive amount of excavation is possible.
Subsequently, as shown in FIG. 8B, the manufactured earth retaining member 1A before hardening is disposed in a state of being almost in close contact along the excavation side wall Ga of the excavated ground G, and UV (not shown) The earth retaining member having a predetermined strength cured by irradiating ultraviolet rays using an irradiator (curing means) and curing the impregnated curable resin 3 (FIG. 7) while being in close contact with the excavation sidewall Ga. 1B is formed. Thereafter, by installing the cut beam 51 and the erection material 52, the earth retaining work is completed.

  The placing work of the structure K is performed by the same construction procedure as that of the first embodiment described above. That is, as shown in FIG. 8C, after the foundation concrete 53 is installed at the bottom of the excavation hole, the bottom slab 54 of the structure K is placed in the concrete. Subsequently, the earth retaining member 1 is used as an outer mold, and an inner mold 56 is installed on the bottom plate 54 with an interval corresponding to the thickness of the side wall 55 of the structure K, and concrete C is placed in these molds. To cast. After that, as shown in FIG. 8 (d), when the concrete C is hardened, a structure K composed of a bottom plate 54 and a side wall 55 embedded in the ground by removing the inner mold 56 is constructed. Become.

In the second embodiment, since the earth retaining member 1A in a state before the curable resin 3 is cured is disposed on the excavation sidewall Ga, the state is flexible as in the first embodiment. 1A can be arranged on the excavation side wall Ga, adhesion to the excavation side wall Ga can be obtained, and a predetermined strength can be given even if the earth retaining member 1 is thinned into a sheet shape. Since the earth retaining member can be disposed in close contact with the excavation side wall Ga, the arrangement space for the earth retaining can be eliminated. Therefore, the amount of surplus digging can be omitted, and an increase in construction cost can be suppressed.
Furthermore, also in the second embodiment, it can be used as a formwork at the time of placing concrete of a structure constructed inside the excavation hole. Therefore, in addition to being able to reduce the earth retaining space, it is possible to further reduce the amount of excessive digging and to reduce the construction cost because the arrangement space of the formwork is suppressed or unnecessary.

  As mentioned above, although embodiment of the earth retaining member by this invention and the construction method of the earth retaining member was described, this invention is not limited to said embodiment, In the range which does not deviate from the meaning, it changes suitably. Is possible.

  For example, in the embodiment described above, a paper member is adopted as the earth retaining sheet 2, but the material is not limited to this member. For example, a fiber sheet, a glass fiber sheet (FRP: fiber reinforced plastic) is used. Any material that can be penetrated by a curable resin such as nylon, vinyl, or sponge is not particularly limited. When the earth retaining sheet 2 is FRP, the curable resin is easily impregnated, so that it is not necessary to use the two-component curable resin 3A as in the present embodiment, and the strength is increased. It is suitable for use as a mold as in the embodiment.

Moreover, in this Embodiment, although the sheet-like earth retaining sheet 2 is employ | adopted as a base material, it is not limited to being a sheet-like base material.
Furthermore, in this Embodiment, although it is set as the structure which applies the curable resin 3 to the surface 2a of the earth retaining sheet 2, it is not limited to this. For example, in the case of a material in which a relatively large gap is formed inside a paper material such as cardboard, such as cardboard, even if it is configured to be impregnated by filling a curable resin inside the cardboard It doesn't matter.

Furthermore, as the earth retaining member 1 of the above-described embodiment, a member that can be naturally decomposed is adopted, and it is a material that can be left in the ground after use and buried. You are not limited to that. For example, instead of a material that can be naturally decomposed, for example, an earth retaining member in which the curable resin has a water stopping performance or plasticity may be used. In this case, the earth retaining sheet 2 and the curable resin 3 (see FIG. 2A) constituting the earth retaining member 1 can contribute to the improvement of the waterproof property of the structure K as it is. That is, it is possible to prevent water leakage from the concrete joints and water leakage due to concrete cracks due to aging. Thus, the effect as a water stop material which prevents water leakage, such as groundwater, can be expected. Conversely, storage equipment such as liquid can also contribute to prevention of leakage of stored items.
In addition, when it is necessary to completely waterproof / stop the structure K, after placing the concrete on the bottom plate 54, the earth retaining member 1B is arranged by the same construction method as described above, and the periphery of the structure K is disposed. The earth retaining member 1B and the earth retaining member 1B installed as an outer mold may be integrated so as to cover and completely waterproof.

  Moreover, in embodiment mentioned above, although the earth retaining member 1 is constructed by arrange | positioning the earth retaining member 1 manufactured previously along the natural ground G, it is limited to such a construction method. Absent. For example, only the earth retaining sheet 2 (base material) having a gap that can be impregnated at the construction site is disposed along the natural ground G, and the gap between the earth retaining sheet 2 is impregnated with the curable resin 3 and then the curable resin. It is good also as the construction method of hardening 3 using suitable hardening means and forming the earth retaining member 1 on-site.

Furthermore, the manufacturing apparatus 4 for manufacturing the earth retaining member 1 of the present embodiment is an example, and it is of course possible to have other configurations, and without using such a manufacturing apparatus 4 The member 1 may be manufactured.
For example, the manufacturing apparatus 4 </ b> A according to the modification shown in FIG. 9 includes a suction portion 44 on the back surface 2 b side of the unwinding sheet 2 at the position where the dispenser 41 is disposed. The suction part 44 is configured to make a negative pressure in a region facing the spout 41a of the dispenser 41 on the back surface 2b side of the earth retaining sheet 2. In this case, the curable resin 3 ejected from the dispenser 41 can be forcibly drawn in from the front surface 2a side to the back surface 2b in the thickness direction of the earth retaining sheet 2, and the curable resin 3 is removed from the earth retaining sheet 2. There exists an advantage which can be impregnated more reliably over 2 whole.

  In the present embodiment, the earth retaining sheet 2 and the curable resin 3 are formed from a material that can be naturally decomposed, but may be a material that is not naturally decomposed. In this case, it is removed after the use as the earth retaining member, but since it is the thin earth retaining member 1, the removal operation at this time can be efficiently performed.

  Furthermore, in the present embodiment, after the earth retaining member 1 is used as a earth retaining member, it is also used as a formwork at the time of placing concrete, but it is of course possible to use only the earth retaining member. And when using only by earth retaining, it is not necessary to be curable resin which has the water stop performance like this Embodiment.

  In addition, the shape and size of the structure K, the planar shape and depth of the excavation part, and the configuration of the cut beam and the erection are not limited to the above-described embodiments, and regardless of these conditions. The earth retaining member of the present invention can be applied.

  In addition, it is possible to appropriately replace the components in the above-described embodiments with known components without departing from the spirit of the present invention.

1, 1A, 1B Earth retaining member 2 Earth retaining sheet (base material)
2a surface 2b back surface 2c uneven part 3 curable resin 3A two-component curable resin 4 production apparatus 41 dispenser 51 beam 52 flank material K structure G ground mountain Ga drilling side wall

Claims (9)

A retaining member arranged along a natural ground,
A substrate having a gap that can be impregnated;
And a curable resin that is impregnated and cured in the gaps of the base material.   The earth retaining member according to claim 1, wherein the base material is an earth retaining sheet formed in a sheet shape.   The earth retaining member according to claim 2, wherein the curable resin is applied to a surface of the earth retaining sheet.   The earth retaining member according to claim 3, wherein the curable resin is a two-component curable resin that is cured by a two-component reaction.   The earth retaining member according to any one of claims 1 to 4, wherein the base material and the curable resin are formed of a material that can be naturally decomposed.   The earth retaining member according to any one of claims 1 to 4, wherein the curable resin has a water stopping performance.   The earth retaining member according to any one of claims 1 to 6, wherein the substrate is provided with irregularities. It is a construction method of the earth retaining member arranged along the natural ground,
A step of impregnating a curable resin into a gap of a substrate having a gap that can be impregnated, and
Placing the base material impregnated with the curable resin in close contact with the natural ground; and
Using a curing means to cure the curable resin impregnated in the placed base material to form an earth retaining member;
The construction method of the earth retaining member characterized by having. It is a construction method of the earth retaining member arranged along the natural ground,
Arranging a base material having a gap that can be impregnated along the natural ground;
Impregnating a curable resin into the gap between the base materials arranged in the natural ground,
Curing the curable resin using a curing means;
The construction method of the earth retaining member characterized by having.

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