JP2010144469A - Construction method of intended underground outer wall, underground outer wall and earth retaining wall - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method of an intended underground outer wall capable of preferably constructing the intended underground outer wall by the use of a temporary earth retaining wall, and to provide the underground outer wall and the earth retaining wall which are constructed by using the method. <P>SOLUTION: A plurality of H-section steel pieces 4 are embedded in a soil-cement column row wall 3 at specified intervals, and plate-shaped members 5 are embedded with both the side edges 5a, 5b of the plate-shaped members 5 engaged between both the flanges 4a, 4b of the adjacent H-section steel pieces 4, thereby constructing the earth retaining wall 1. Subsequently, the internal soil G surrounded by the earth retaining wall 1 is excavated, and the soil-cement 3 is cut, thereby exposing the flanges 4a of the H-section steel pieces 4 of the earth retaining wall 1 and one surface 5c of the plate-shaped members. In addition, reinforcing bars 7 are arranged at the inner side of the earth retaining wall 1, and concrete 8 is poured so as to construct a reinforced concrete wall 9, thereby constructing the intended underground outer wall A which is integrally constituted of the H-section steel pieces 4 of the earth retaining wall 1, the plate-shaped members 5 and the reinforced concrete wall 9. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a construction method of a basement outer wall, a basement outer wall, and a mountain retaining wall.

  Conventionally, in underground construction of a building structure (when constructing an underground structure), for example, a soil cement column wall is constructed using a multi-axis excavator, and an H-shaped steel is formed inside the soil cement column wall. A temporary mountain retaining wall is constructed by installing a stress material (core material). And this mountain retaining wall supports the lateral pressure from the side ground, excavates the ground while suppressing horizontal deformation, and constructs a new underground outer wall inside the retaining wall .

  However, when constructing the underground outer wall in this way, even if the stress material of the retaining wall is left behind, the rigidity of the stress material is not included in the rigidity of the underground outer wall. There is a current situation. In addition, since a space for a temporary retaining wall is required outside the main underground wall, if the outer wall line is close to the site boundary line, there is no room and construction becomes difficult. Furthermore, since the underground outer wall is constructed again after excavating the ground, it requires a lot of construction work and has a drawback that the construction period is prolonged.

  On the other hand, for example, a method is known in which a reinforced concrete underground continuous wall is used as a retaining wall and a main underground wall.

In addition, a special precast concrete plate is inserted into the soil cement column wall continuously as a stress material to construct a retaining wall, and after excavation of the ground, the upper and lower ends of the precast concrete plate are fixed with beams, and the underground outer wall is left as it is. There is also a method used as (see, for example, Patent Document 1).
JP-A-6-17419

  However, the method of using the underground continuous wall as the retaining wall and the underground underground wall has a track record, but the construction cost is high and it is difficult to control the quality of the concrete as the permanent frame. For this reason, it is the present condition that it is not used so much in recent years.

  On the other hand, a precast concrete plate is also inserted in the soil cement column wall to construct a retaining wall, and the precast concrete plate used as the stress material of the retaining wall is used as an underground outer wall as it is. If the side end surfaces of the steel plates are not in close contact with each other, inconvenience occurs as an underground outer wall. Therefore, it is difficult to ensure the construction accuracy of the precast concrete plate and the water-stopping property as the underground outer wall.

  In view of the above circumstances, the present invention provides a construction method of a permanent underground outer wall capable of suitably constructing a permanent underground outer wall using a temporary mountain retaining wall, an underground outer wall constructed using this method, and The purpose is to provide a retaining wall.

  In order to achieve the above object, the present invention provides the following means.

  The construction method of the present underground underground wall of the present invention is a method of constructing a permanent underground outer wall using a temporary retaining wall, and the H-shaped steel is placed at a predetermined interval inside the soil cement column wall. A plurality of holes are embedded, and plate-like members are embedded while engaging both end portions between the flanges of the adjacent H-shaped steels to construct the retaining wall, and are surrounded by the retaining wall. Excavating the ground inside and cutting the soil cement to expose one surface of the H-shaped steel of the retaining wall and one surface of the plate-like member, and arrange reinforcing bars inside the retaining wall In addition, a reinforced concrete wall is constructed by placing post-cast concrete, and a permanent underground outer wall is formed by integrating the H-shaped steel and the plate-like member of the retaining wall with the reinforced concrete wall. What you did And features.

  Moreover, the underground outer wall of this invention is constructed | assembled by the construction method of said underground underground outer wall, and the said H-shaped steel of the said retaining wall and the said plate-shaped member, and the said reinforced concrete wall part are comprised integrally. It is characterized by that.

  Further, the mountain retaining wall of the present invention is constructed by the above-described construction method of the underground underground wall, and a plurality of the H-shaped steels are embedded in the interior of the soil cement column wall at a predetermined interval and adjacent to each other. A plate-like member is embedded while engaging both end portions between both flanges of the H-shaped steel.

  In such a construction method of the underground outer wall and the invention of the underground outer wall and the mountain retaining wall, after the soil cement column wall is constructed, H as a stress material (core material) is formed inside the soil cement column wall. In addition to embedding and embedding the shape steel, plate-like members are embedded to construct the retaining wall. For this reason, it is possible to design the retaining wall more rationally by checking and evaluating the behavior (rigidity) as a composite structure including plate-shaped members and, in some cases, soil cement, in addition to H-shaped steel. Become. In addition, it is possible to embed the plate-like member inside the soil cement column wall while engaging both end portions between the flanges of the H-shaped steel and guiding the plate-shaped member to the H-shaped steel. It becomes possible to dispose at a predetermined position accurately and easily.

  In addition, after building the retaining wall, excavating the ground and cutting the soil cement, and integrating the H-shaped steel and plate-like member of the retaining wall to construct the reinforced concrete wall portion, the existing underground outer wall is secured to the mountain. It becomes possible to construct | assemble as a composite structure (composite wall) of the H-shaped steel and plate-shaped member of a wall, and a reinforced concrete wall part. For this reason, the design of the underground underground wall of this installation can evaluate the rigidity as a composite structure of the H-shaped steel and plate member of the retaining wall and the reinforced concrete wall.

  According to the construction method of the underground outer wall and the underground outer wall and the mountain retaining wall according to the present invention, the mountain retaining wall behaves as a composite structure including a plate-shaped member and, in some cases, soil cement in addition to the H-shaped steel ( By checking and evaluating (rigidity), more rational design is possible. In addition, it is possible to embed the plate-like member inside the soil cement column wall while engaging both end portions between the flanges of the H-shaped steel and guiding the plate-shaped member to the H-shaped steel. It becomes possible to dispose at a predetermined position accurately and easily.

  Furthermore, since it is possible to construct the existing underground outer wall as a composite structure (composite wall) of H-shaped steel and plate-shaped members of the retaining wall and the reinforced concrete wall, the design of the installed underground outer wall is It is possible to evaluate the rigidity of the composite structure of the H-shaped steel and plate-like member of the wall and the reinforced concrete wall.

  And after embedding H section steel and a plate-like member in the soil cement column wall as mentioned above and using it as a mountain retaining wall, the reinforced concrete wall part is built integrally inside, and it is used as a permanent underground outer wall. It is possible to prevent excessive design of the underground outer wall and reduce the required space on the outer periphery. In addition, it is possible to significantly shorten the construction period compared to the case of constructing all of the underground outer walls with cast-in-place concrete, and to ensure water-stopping by constructing the reinforced concrete wall with only the inside as post-cast concrete It is also possible to do.

  Hereinafter, with reference to FIGS. 1-6, the construction method of the underground underground wall, underground underground wall, and mountain retaining wall which concern on one Embodiment of this invention are demonstrated. The present embodiment relates to a method of constructing a permanent underground outer wall using a temporary retaining wall when constructing an underground structure, and an underground outer wall and a retaining wall constructed using this method.

  In the construction method of the underground underground wall according to the present embodiment (when constructing an underground structure), first, as shown in FIGS. 1 to 3, the mountain retaining wall 1 is constructed on the outer periphery of the underground structure. .

  When constructing the retaining wall 1 of the present embodiment, first, as shown in FIG. 1A and FIG. 1B, for example, a predetermined number is used using a multi-axis excavator 2 having a plurality of earth augers. Cement milk is poured and stirred while excavating the ground G to the depth, and the soil cement column wall 3 is continuously constructed along the outer periphery of the underground structure.

  Next, as shown in FIGS. 2 (a) and 2 (b), an H-section steel 4 of a stress material (core material) is embedded and embedded in the interior of the soil cement column wall 3 at a predetermined interval. To do. At this time, the H-shaped steel 4 is embedded so that one flange 4 a and the other flange 4 b are along the extending direction T of the soil cement column wall 3, and adjacent to the extending direction T of the soil cement column wall 3. One flange 4a and the other flange 4b of the matching H-section steel 4 are embedded so as to be arranged in the same plane.

  Further, the H-section steel 4 is embedded in the soil cement column wall 3 and, as shown in FIGS. 3 (a) and 3 (b), a plate-like plate member (PC plate 5) made of precast concrete. ) And embed. The PC plate 5 has a thickness smaller than the distance between the flanges 4a and 4b of the H-shaped steel 4 (the length of the web 4c) and the distance between the adjacent H-shaped steels 4 (the web of the adjacent H-shaped steel 4). (Interval between 4c). The PC plate 5 is constructed between the adjacent H-shaped steels 4 while inserting the both side end portions 5a, 5b between the flanges 4a, 4b of the adjacent H-shaped steels 4 and engaging them. Inserted and buried.

  In this way, both end portions 5 a and 5 b are engaged between the flanges 4 a and 4 b of the H-section steel 4, and the PC plate 5 is guided to the H-section steel 4 and embedded in the soil cement column wall 3. Therefore, the PC plate 5 can be accurately and easily disposed at a predetermined position in which the one surface 5c and the other surface 5d are arranged in parallel with the flanges 4a and 4b of the H-section steel 4 reliably and easily. become.

  In this way, the retaining wall 1 of the present embodiment including the PC plate 5 in addition to the conventional soil cement (soil cement column wall 3) and the H-shaped steel 4 of the stress material is constructed. And in the mountain retaining wall 1 of this embodiment comprised in this way, in addition to the H-section steel 4, the PC board 5 also functions as a stress material. For this reason, by confirming and evaluating the behavior (rigidity) as a composite structure including PC plate 5 and, in some cases, soil cement 3 in addition to H-section steel 4, it is more rational than conventional retaining walls. Design becomes possible.

  Next, when the retaining wall 1 is constructed as described above, as shown in FIGS. 4 (a) and 4 (b), the ground G on the inner side (excavation range) surrounded by the retaining wall 1 has a predetermined depth. Drill until. At this time, the ground G is excavated and the soil cement 3 is cut to expose one flange 4 a of the H-section steel 4 and one surface 5 c of the PC plate 5.

  Next, as shown in FIGS. 5 (a) and 5 (b), the foundation 6 of the underground structure is constructed on the ground G inside the retaining wall 1, and the reinforcing bars 7 are disposed along the inner surface of the retaining wall 1. Arrange the bars. Then, as shown in FIGS. 6 (a) and 6 (b), a formwork is installed and post-cast concrete 8 is laid to construct a reinforced concrete wall 9 that is the inner part of the outer wall of the underground structure. To do. At this time, while placing the post-cast concrete 8 so as to embed the reinforcing bar 7 of the reinforced concrete wall portion 9, one flange 4a of the H-section steel 4 of the retaining wall 1 is buried in the post-cast concrete 8, The post-cast concrete 8 is in close contact with the one surface 5c of the PC board 5. As a result, the reinforced concrete wall portion 9 is constructed integrally with the H-shaped steel 4 and the PC board 5 of the retaining wall 1, and the reinforced concrete wall portion 9 of the outer wall inner portion and the retaining wall 1 of the outer wall outer portion are integrated. The main underground wall A (outer wall of the underground structure) is constructed as the wall.

  The ground G inside the retaining wall 1 is excavated and the soil cement 3 is cut to expose one flange 4a of the H-section steel 4 and one surface 5c of the PC plate 5 (FIG. 4 (a) and FIG. 4 (b)), roughening the one surface 5c of the PC plate 5, or attaching a stud or the like to the flange surface of one flange 4a of the H-shaped steel 4 or the one surface 5c of the PC plate 5, 1 and the reinforced concrete wall 9 may be integrated more firmly.

  And in the underground outer wall A of this embodiment constructed | assembled as mentioned above, it can construct | assemble as a composite structure (composite wall) with the H-section steel 4 and PC board 5 of the retaining wall 1, and the reinforced concrete wall part 9. FIG. It becomes possible. For this reason, the design of the underground underground wall A of the present installation can evaluate the rigidity as a composite structure of the H-shaped steel 4 and PC plate 5 of the retaining wall 1 and the reinforced concrete wall portion 9.

  Therefore, in the construction method of the underground outer wall A and the underground outer wall A and the mountain retaining wall 1 of the present embodiment, the H-section steel 4 and the PC plate 5 are embedded in the soil cement column wall 3 as described above. After being used as the wall 1, the reinforced concrete wall 9 is integrally constructed on the inside to form a permanent underground outer wall A, thereby preventing excessive design of the underground outer wall A and reducing the required space on the outer periphery. become. In addition, it is possible to significantly shorten the construction period compared with the case where all of the underground outer wall A is constructed by cast-in-place concrete, and the construction can be stopped by constructing the reinforced concrete wall portion 9 by using only the inside as post-cast concrete. It is also possible to ensure aqueous properties.

  As mentioned above, although the construction method of the underground underground wall according to the present invention and the embodiment of the underground outer wall and the mountain retaining wall constructed by using this method have been described, the present invention is not limited to the above embodiment. However, it can be changed as appropriate without departing from the spirit of the invention. For example, in the present embodiment, the plate member is described as being a PC plate (precast concrete plate) 5, but the plate member according to the present invention is made of a steel material in a truss shape as shown in FIG. 7, for example. In this case, the same effect as that of the present embodiment can be obtained by embedding the plate-like member 5 in the soil cement column wall 3 while engaging the H-shaped steel 4. It is possible to obtain. Therefore, the plate-like member according to the present invention need not be limited to the PC plate 5 in particular.

It is a figure which shows the state which is building the soil cement pillar row | line | column wall of a mountain retaining wall in the construction | assembly method of the underground underground wall which concerns on one Embodiment of this invention. It is a figure which shows the state which embedded H-section steel inside the soil-cement column wall of the retaining wall in the construction method of the underground underground wall which concerns on one Embodiment of this invention. In the construction method of the underground underground wall according to one embodiment of the present invention, a state in which a PC plate (plate-like member) is embedded inside the soil cement column wall of the retaining wall (a state where the retaining wall is constructed) is shown. FIG. It is a figure which shows the state which excavated the ground inside a retaining wall and cut the soil cement in the construction method of the underground underground outer wall which concerns on one Embodiment of this invention. It is a figure which shows the state which arranged the reinforcing bar of the reinforced concrete wall part inside the mountain retaining wall in the construction method of the underground underground wall which concerns on one Embodiment of this invention. In the construction method of the underground underground wall according to the embodiment of the present invention, a state in which the reinforced concrete wall portion is constructed by placing the post-cast concrete inside the retaining wall (the state where the underground underground wall is constructed) FIG. It is a figure which shows the modification of the plate-shaped member which concerns on this invention.

Explanation of symbols

1 Mountain retaining wall 2 Multi-axis excavator 3 Soil cement column wall (Soil cement)
4 H-section steel 4a One flange 4b The other flange 4c Web 5 PC plate 5a Side end 5b Side end 5c One side 5d Other side 6 Foundation 7 Reinforcement 8 Post-cast concrete 9 Reinforced concrete wall A Ground basement underground wall G Ground

Claims (3)

A method of constructing a main underground wall using a temporary retaining wall,
A plurality of H-section steels are embedded in the interior of the soil cement column wall at a predetermined interval, and the plate-like members are fitted while engaging both end portions between the flanges of the adjacent H-section steels. Burying, building the retaining wall,
Excavating the inner ground surrounded by the retaining wall and cutting the soil cement to expose one flange of the H-shaped steel and one surface of the plate member of the retaining wall;
Reinforcing bars inside the mountain retaining wall and constructing a reinforced concrete wall by placing post-cast concrete,
A construction method of a permanent underground outer wall, wherein a permanent underground outer wall is constructed by integrating the H-shaped steel and the plate-like member of the mountain retaining wall and the reinforced concrete wall portion.   It is constructed | assembled by the construction method of the permanent underground outer wall of Claim 1, and the said H-shaped steel of the said mountain retaining wall, the said plate-shaped member, and the said reinforced concrete wall part are comprised integrally, and it is comprised. outer wall.   It is constructed | assembled by the construction method of the underground underground wall of the main installation of Claim 1, and while embedding two or more said H-section steel in the inside of the said soil-cement column wall, each of adjacent H-section steel A mountain retaining wall characterized in that a plate-like member is embedded while both end portions are engaged between both flanges.

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