JP5871624B2 - Construction method of retaining wall - Google Patents

Description

The present invention is a spacing between the skeleton line and neighboring land boundary of the building to be newly constructed is in a narrow place, it relates to a method of constructing the earth retaining wall by SMW (registered trademark) method.

  The SMW (registered trademark) method uses a dedicated multi-axis kneading auger machine to excavate the ground to a predetermined depth, inject cement slurry from its tip, knead, pull up the auger machine, and then core material such as H-shaped steel Is a conventionally well-known construction method for building a soil cement continuous wall.

  In this well-known construction method, as shown in FIG. 10, in a place where the space between the frame line 2 and the adjacent boundary line 4 of the newly built building 1 is narrow, construction using a general roll material is related to clearance. With difficulty. In this case, it is necessary to consider the movement of the building position and the driving of the core material 5 to the housing side of the newly built building 1. In addition, the code | symbol 3 in FIG. 10 shows an existing building, and the code | symbol 6 shows a soil cement continuous wall.

  However, when the results of these studies do not come true due to strength or the like, as shown in FIG. 11, a highly rigid earth retaining steel material 9 in which an H-section steel 8 is welded to a sheet pile 7 is used. It is conceivable to adopt a construction method in which a press-fitting machine is used to press-fit with Zero Piler (registered trademark).

JP 2002-371545 A

  In this construction method, there is a problem that due to the use of a specially shaped earth retaining steel material 9 or a dedicated press-fitting machine, the cost is high and the construction cost is extremely high, and the water shielding performance is inferior. ing.

  Therefore, in the case of this conventional example, when constructing a mountain retaining wall in a place where the space between the frame line 2 and the adjacent boundary line 4 of the newly constructed building 1 is narrow, the construction cost is lowered and the water shielding performance is improved. There is a problem that must be solved to improve.

The gist of the present invention for solving the problems of the conventional example is a method for constructing a retaining wall that is constructed in a place where a space between a frame line of a newly constructed building and a boundary line of an adjacent land is narrow, The construction method includes a step of injecting cement slurry from the tip while excavating the ground to a predetermined depth with a multi-axis kneading auger machine, and kneading the core material after lifting the auger machine, and a soil cement continuous wall And a step of excavating a part of the soil cement continuous wall on the building side, and the core material is built in a narrow portion above the dry area housing of the building. The built-in web with a short width and a roll H built below the narrow part are connected to each other, and the built-in H and the roll H are connected to the upper part of the roll H by the built-in H. Bottom of By cutting the elongated shape fits, and welded by fitting the lower portion of the built H at a site lacking said cutting, the upper part of the core material, the center-of-gravity position hanging down vertically during hanging of the core member It is to attach a hanging jig .

The constricted portion of the soil cement continuous wall in the narrow portion is excavated with a blade attached to an auger machine, and cement slurry is injected and kneaded to form a soil cement;
The joint position of the core material is to join the rolls H together using a bolt joint;
Is included.

According to the construction method of the retaining wall according to the present invention, since the core material is configured by connecting the roll H and the built-in H, there is no need for a specially shaped steel material or a dedicated press-fitting machine as in the conventional example. As a result, costs can be reduced and construction costs can be kept low.
In addition, because the soil cement continuous wall is constructed, water leakage from the soil cement surface does not occur, the water shielding performance is good, and the displacement of the retaining wall is within the allowable range, and the strength is also high. no problem.
And since the web is built with a short built-in H in the narrow area above the dry area housing in a place where the space between the housing line of the newly constructed building and the boundary of the adjacent land is narrow, even if the clearance is narrow There is no problem.
Furthermore, it can respond to various construction sites by changing the combination of the shapes of the core roll H and the built-in H.
In particular, by attaching a hanging jig to the upper part of the core material at the position of the center of gravity that hangs vertically when the core material is suspended, the core material is Since it hangs vertically, it has an excellent effect that it does not interfere with the erection work.

  The constricted part of the soil cement continuous wall in the narrow part is excavated with a blade attached to the auger machine, and cement slurry is injected and kneaded to form the soil cement, which is due to the presence of the soil cement in the constricted part. It has an excellent effect of improving the water stoppage of the soil cement continuous wall.

  As for the joint position of the core material, the roll H is built below the narrow part with a sufficient clearance by joining the rolls H using bolt joints, so that the joint part can be accommodated without problems. Has an effect.

It is a longitudinal cross-sectional view of the building 12 (underground frame) explaining the mountain retaining wall which built the core material 11. FIG. It is a top view of the building 12 (underground frame) which constructs a mountain retaining wall. It is explanatory drawing which excavates and kneads the ground 14 with the multi-axis kneading auger machine 13. It is explanatory drawing which hangs down with the crane 15 and builds in the core material 11. FIG. 2 is a front view of a core material 11. FIG. 3 is a perspective view of a core material 11. FIG. It is a cross-sectional view schematically showing a mountain retaining wall when the core material 11 is built. 3 is a cross-sectional view schematically showing a mountain retaining wall of a narrow portion 33. FIG. It is a cross-sectional view schematically showing a mountain retaining wall below the narrow portion 33. It is a cross-sectional view which shows schematically the mountain retaining wall which concerns on a prior art example. It is a cross-sectional view which shows schematically the mountain retaining wall which uses the earth retaining steel material 9 based on a prior art example.

  Next, embodiments of the present invention will be described with reference to the drawings. The present invention is a method of constructing a mountain retaining wall by an SMW (registered trademark) method in a place where the distance between a frame line of a newly-built building and a boundary line of an adjacent land is narrow. FIG. FIG. 2 is a longitudinal sectional view of a building 12 (underground frame) for explaining a mountain retaining wall, and FIG. 2 is a plan view of the building 12 (underground frame) for constructing the mountain retaining wall.

  As described above, the SMW (registered trademark) method is a conventionally well-known method for constructing a soil cement continuous wall. First, as shown in FIG. 3, the ground 14 is excavated to a predetermined depth by a multi-axis kneading auger machine 13 developed exclusively, and cement slurry is injected from the tip 13 a to perform excavation kneading.

  And after raising the multi-axis kneading auger machine 13, as shown in FIG. 4, the core material 11 is suspended and built by the crane 15 to construct the soil cement continuous wall 6 (see FIG. 10).

  Next, the core material 11 will be described. The core material 11 is H-shaped steel. Specifically, as shown in FIGS. 1, 5, and 6, a built-in H 11 b built in the narrow portion 33 above the dry area housing 16 of the building 12, It is configured by connecting a roll H11a to be built in a portion with a sufficient clearance below the portion 33.

The roll H11a is a standard H-shaped steel made by rolling. An example of the dimension is H dimension 400 mm × B dimension 200 mm × t1 dimension 8 mm × t2 dimension 13 mm.
(H dimension: spacing between flanges, B dimension: flange width, t1 dimension: web thickness, t2 dimension: flange thickness)

  The built-in H11b is a non-standard size H-shaped steel, and is manufactured to an appropriate size by welding a steel material at a factory. An example of the dimensions is, for example, H dimension 160 mm × B dimension 200 mm × t1 dimension 12 mm × t2 dimension 22 mm.

  In this way, the built-in H11b built from the dry area housing 16 to the narrow portion 33 above has the web 17 formed in a short width and the H dimension formed shorter than the standard product. The reason for this is that, as shown in FIGS. 1 and 2, the clearance of the narrow portion 33 is narrow in a place where the distance between the frame line 18 and the adjacent boundary line 19 of the newly built building 12 (underground frame) is narrow. This is because the H-section steel of the product width cannot be used. In addition, the code | symbol 32 in FIG. 2 shows the construction range of the retaining wall concerning this invention.

  On the other hand, the roll H11a built below the narrow part 33 is a standard H-shaped steel. The reason for this is that, as shown in FIG. 1, a standard product can be used below the narrow portion 33 because there is a clearance, and because it becomes strict in terms of stress, it has a predetermined strength. It is.

  As shown in FIGS. 5 and 6, the connecting portion 11c that connects the build H11b and the roll H11a is formed by cutting the upper portion 20 of the roll H11a into a vertically long shape into which the lower portion 21 of the build H11b is fitted. The lower part 21 of the built-in H11b is fitted into the existing part and fixed by welding.

  As shown in FIG. 5, a hanging jig 22 is attached to the upper part of the core material 11, that is, the upper part of the built-in H 11 b at the center of gravity that hangs vertically when the core material 11 is suspended. Thus, by providing the suspension jig 22, when the suspension jig 22 is locked and the core material 11 is suspended, the core material 11 hangs vertically, so that there is no hindrance to the erection operation.

  Further, in the core material 11 shown in FIG. 5, a notch 34 is formed in the upper part of the web 17 of the built-in H11b, and a suspension hole 35 is formed in one flange, and a U-shaped suspension is formed in the suspension hole 35. A jig 22 is attached.

  As shown in FIG. 5, the joint position 23 of the core material 11 is brought into contact with the rolls H <b> 11 a and joined by using a bolt joint 24 including an accessory plate 24 a and a bolt 24 b. By joining the rolls H11a in this way, the roll H11a is built below the narrow portion 33 having a sufficient clearance, so that the bolt joint 24 can be accommodated without any problem (see FIG. 1).

  As shown in FIG. 7, a soil cement continuous wall 25 is continuously formed on the mountain retaining wall when the core material 11 thus constructed is built, and the core material 11 is built therein. The core material 11 located on the adjacent land boundary 19 side indicates a built-in H11b.

  Further, the constricted portion 31 of the soil cement continuous wall 25 in the narrow portion 33 shown in FIG. 8 is excavated by a blade (not shown) attached to the multi-shaft kneading auger machine 13, and cement slurry is injected and kneaded. Is formed. The presence of the soil cement in the constricted portion 31 improves the water stoppage of the soil cement continuous wall 25.

  Next, the soil cement continuous wall 25 thus constructed excavates a part of the soil cement on the building side of the building 12. FIG. 8 is a cross-sectional view schematically showing the mountain retaining wall of the narrow portion 33 above the dry area housing 16, and the soil cement 26a is excavated along one flange of the built H11b.

  FIG. 9 is a cross-sectional view schematically showing the retaining wall below the narrow portion 33, and the soil cement 26b is excavated along one flange of the roll H11a.

  Further, as shown in FIG. 1, a first-stage beam 28a, a second-stage beam 28b, and a third-stage beam 28c are provided for the build H11b. In addition, the code | symbol 29 in FIG. 1 shows backfill.

  As described above, according to the construction method of the retaining wall according to the present invention, the core material 11 is configured by connecting the roll H11a and the built-in H11b, so that there is no need for a special-shaped steel material or a dedicated press-fitting machine, Costs can be reduced and construction costs can be kept low. Further, since the soil cement continuous wall 25 is constructed, water leakage from the surface of the soil cement does not occur and the water shielding performance is good. And since the web 17 builds the short built-in building H11b from the dry area housing 16 to the narrow portion 33 above the dry area housing 16 in a place where the space between the housing body line 18 and the adjacent land boundary line 19 of the newly built building is narrow, it is narrow. There is no problem even with clearance.

DESCRIPTION OF SYMBOLS 1 Newly built building 2 Building line 3 Existing building 4 Adjacent land boundary line 5 Core material 6 Soil cement continuous wall 7 Sheet pile 8 H-section steel 9 Earth retaining steel material 11 Core material 11a Roll H
11b Built H
11c connecting part 12 building 13 multi-axis kneading auger 13a tip 14 ground 15 crane 16 dry area housing 17 web 18 housing line 19 adjacent land boundary line 20 upper 21 lower 22 lifting jig 23 joint position 24 bolt joint 24a accessory plate 24b bolt 25 Soil cement continuous wall 26a, 26b Soil cement 28a, 28b, 28c Cut beam 29 Backfill 31 Constricted part 32 Construction range 33 Narrow part 34 Notch part 35 Suspension hole

Claims (3)

It is a method of constructing a retaining wall that is constructed in a place where the distance between the frame line of the newly constructed building and the boundary line of the adjacent land is narrow,
The method of constructing the retaining wall includes a step of injecting cement slurry from its tip while excavating the ground to a predetermined depth with a multi-axis kneading auger machine, kneading the core material after pulling up the auger machine, A step of constructing a soil cement continuous wall, and a step of excavating a part of the soil cement continuous wall on the building side.
The core material is configured by connecting a build H having a short web built in the narrow portion above the dry area housing of the building and a roll H built below the narrow portion,
The built-up H and the roll H are connected by cutting the upper part of the roll H into a vertically long shape into which the lower part of the built-in H fits, and fitting the lower part of the built-in H into the cut-out part by welding. And
A method for constructing a retaining wall, wherein a suspension jig is attached to an upper portion of the core member at a center of gravity that hangs vertically when the core member is suspended . 2. The soil cement is formed according to claim 1, wherein the constricted portion of the soil cement continuous wall in the narrow portion is excavated with a blade attached to an auger machine, and cement slurry is injected and kneaded to form a soil cement. How to install the retaining wall. The joint position of a core material joins rolls H using a bolt joint. The construction method of the retaining wall of Claim 1 characterized by the above-mentioned.

Images