Rubble concrete also serving as strut

Abstract

To provide a construction method of rubble concrete capable of forming an earth retaining wall which can eliminate the necessity of a strut in the case where conventionally the strut is needed.SOLUTION: A construction method of rubble concrete includes: a continuous wall construction step of constructing an earth retaining wall 10 around a construction division G1; a primary rubble concrete construction step of constructing shaft-like primary rubble concrete 21, 22 so as to connect a pair of opposing walls 12, 13 of the earth retaining wall 10; and a secondary rubble concrete construction step of constructing secondary rubble concrete 23 around the primary rubble concrete 21, 22, and constructing rubble concrete 20 in the entire region of the construction division G1.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a method for constructing rapple concrete and to a rapple concrete that can also be used as a strut. [Background technology]

[0002] When constructing a building, first, earth retaining walls are installed on the ground and then the ground is excavated. The earth retaining walls are installed according to the plan shape of the building in a plan view. In addition, when the ground is excavated and the installed earth retaining walls cannot stand on their own, struts may be installed between the opposing earth retaining walls to prevent excessive deformation (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-122280 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional earth retaining wall described in Patent Document 1, the installation of braces increases the construction period, and the braces are an obstacle to construction, which increases the construction cost. For this reason, there is a demand for an earth retaining wall that does not require braces even in cases where braces are essentially required (when the earth retaining wall cannot stand on its own without them).

[0005] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a method for constructing rapple concrete that can form a retaining wall that eliminates the need for struts in cases where struts are normally required, and rapple concrete that can also be used as a strut. [Means for solving the problem]

[0006] In order to achieve the above object, one aspect of the method for constructing rapple concrete according to the present invention is to a diaphragm wall construction process for constructing a retaining wall around the construction area; A primary lapple concrete construction process for constructing an axial primary lapple concrete so as to connect a pair of opposing walls of the earth retaining wall; A secondary lapple concrete construction process for constructing a secondary lapple concrete around the periphery of the primary lapple concrete to construct the lapple concrete over the entire construction area; The present invention is characterized by having the following.

[0007] According to this aspect, by constructing the axial primary rapple concrete between a pair of opposing walls of the earth retaining wall, the primary rapple concrete can fulfill the function of supporting the opposing walls in the same way as a conventional brace, so that an earth retaining wall can be formed without a brace even in cases where a brace is originally required. Furthermore, since a brace is no longer necessary, the construction costs incurred in the past for providing a brace can be reduced.

[0008] In addition, in another aspect of the rapple concrete construction method of the present invention, the retaining wall has two pairs of opposing walls, and in the primary rapple concrete construction process, the primary rapple concrete corresponding to the two pairs of opposing walls is constructed along two perpendicular directions.

[0009] According to this embodiment, by constructing axially shaped primary rapple concrete corresponding to two pairs of opposing walls along two perpendicular directions, both pairs of opposing walls of the earth retaining wall can be supported by the primary rapple concrete, thereby more reliably supporting the earth retaining wall.

[0010] In another aspect of the method for constructing rapple concrete according to the present invention, in the first rapple concrete construction process, a plurality of the first rapple concretes are constructed at intervals, and in the second rapple concrete construction process, the second rapple concrete is constructed in the intervals.

[0011] According to this embodiment, by constructing multiple primary rapple concrete at intervals, it is possible to provide almost uniform support over the entire area of ​​the opposing wall of the earth retaining wall with primary rapple concrete, thereby more reliably supporting the earth retaining wall.

[0012] In addition, in order to achieve the above-mentioned object, one embodiment of the rapple concrete which can also be used as a cutting beam according to the present invention is a rapple concrete which can also be used as a cutting beam, which connects between a pair of opposing walls of a retaining wall which is constructed around the periphery of the construction area of ​​the rapple concrete, and which is characterized in that it is formed from a part of the rapple concrete which is constructed over the entire area of ​​the construction area, and has an axial shape.

[0013] According to this aspect, the axially shaped rapple concrete that can also be used as a cut beam is formed from a part of the rapple concrete constructed throughout the entire construction area, and by using this rapple concrete that can also be used as a cut beam to connect a pair of opposing walls of the retaining wall that is installed around the construction area, the rapple concrete can perform the function of supporting the opposing walls in the same way as a conventional cut beam, so that an earth retaining wall can be formed that does not require a cut beam. Effect of the Invention

[0014] As can be understood from the above explanation, the method of constructing rapple concrete and the rapple concrete that can also be used as a brace of the present invention make it possible to form a retaining wall that does not require a brace in cases where a brace would normally be required. [Brief description of the drawings]

[0015] [Figure 1] Schematic diagram showing the first stage of the construction procedure of the rapple concrete according to the embodiment. [Diagram 2] Schematic diagram showing the second stage of the construction procedure of the rapple concrete according to the embodiment. [Diagram 3] Schematic diagram showing the third stage of the construction procedure of the rapple concrete according to the embodiment. [Figure 4] Schematic diagram showing the fourth stage of the construction procedure of the rapple concrete according to the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment will be described with reference to the accompanying drawings. In order to facilitate understanding of the description, the same components in each drawing are denoted by the same reference numerals as much as possible, and duplicated description will be omitted.

[0017] In the following description, the x, y, and z directions are perpendicular to each other. The x and y directions are horizontal, and the z direction is vertical. The x direction is the extension direction of one of the two pairs of opposing walls of the rectangular retaining wall 10, and the y direction is the extension direction of the other opposing wall 13. For ease of explanation, the positive z direction side may be referred to as the upper side, and the negative z direction side may be referred to as the lower side.

[0018] 1 to 4 are schematic diagrams showing first to fourth stages of a construction procedure for a rapple concrete 20 according to an embodiment. In each of Figs. 1 to 4, (a) is a plan view, and (b) is a cross-sectional view taken along the cross-sectional lines I, II, III, and IV shown in (a) of each figure.

[0019] The rapple concrete 20 (see FIG. 4) is unreinforced concrete laid from under the foundation to the supporting ground. When constructing a building, the soft ground under the foundation that cannot support the building is replaced with the rapple concrete 20.

[0020] When constructing the rapple concrete 20, first, as in the first stage shown in FIG. 1, an earth retaining wall 10 is constructed around the construction section G1 of the ground G (continuous wall construction process). The earth retaining wall 10 includes, for example, a soil cement column-type continuous wall, a sheet pile, a parent pile horizontal sheet pile, an underground RC wall, and the like. In this embodiment, the earth retaining wall 10 is rectangular in plan view and has two pairs of opposing walls. The earth retaining wall 10 is arranged such that one of the two pairs of opposing walls 12, 12 forming the long side of the rectangular shape extends in the x direction and faces in the y direction, and the other of the two pairs of opposing walls 13, 13 forming the short side of the rectangular shape extends in the y direction and faces in the x direction.

[0021] In the first stage shown in FIG. 1, a trench 11 is provided in the construction section G1 along the y direction so as to connect between one of the opposing walls 12, 12. As shown in FIG. 1(a), the trench 11 extends along the y direction, and a plurality of trenches (three in the example of FIG. 1) are arranged at approximately equal intervals along the x direction. As shown in FIG. 1(b), the trench 11 is excavated so as to pass through the base B of the underground skeleton foundation and reach the base A of the lapplecon. The base A of the lapplecon is the deepest surface of the lapplecon concrete 20 after construction. The base B of the underground skeleton foundation is the deepest surface of the foundation of the building constructed on the lapplecon concrete 20. That is, the lapplecon concrete 20 after construction is installed in the section from the base A of the lapplecon to the base B of the underground skeleton foundation.

[0022] Next, in the second stage shown in FIG. 2, an axial primary rapple concrete 21 is constructed along the y direction so as to connect one of the two pairs of opposing walls 12, 12 of the retaining wall 10 (primary rapple concrete construction process). As shown in FIG. 2(a), the primary rapple concrete 21 is provided along the multiple grooves 11 provided in the first stage, and extends in the y direction to connect the pair of opposing walls 12, 12 of the retaining wall 10. Also, multiple pieces (three in the example of FIG. 2) are arranged at approximately equal intervals along the x direction. As shown in FIG. 2(b), the primary rapple concrete 21 is formed at a height from the rapple concrete bottom A to the basement foundation bottom B of the underground structure, similar to the rapple concrete 20 that is finally constructed.

[0023] Next, in the third stage shown in FIG. 3, an axial primary rapple concrete 22 is further constructed along the x direction to connect the other of the two pairs of opposing walls 13, 13 of the retaining wall 10 (primary rapple concrete construction process). As shown in FIG. 3(a), the primary rapple concrete 22 extends in the x direction, intersects the primary rapple concrete 21 at right angles, and connects the pair of opposing walls 13, 13 of the retaining wall 10. Note that the primary rapple concrete 22 may be configured such that multiple pieces are arranged at approximately equal intervals along the y direction, similar to the primary rapple concrete 21. As shown in FIG. 3(b), the primary rapple concrete 22 is also formed at a height from the rapple concrete bottom A to the basement foundation bottom B of the underground structure, similar to the rapple concrete 20 and the primary rapple concrete 21 that are finally constructed.

[0024] The construction method for the primary rappel concrete 21, 22 may be any method, for example, a method in which formwork is set up on-site and concrete is poured, or a method in which precast concrete manufactured in advance in a factory or the like is installed.

[0025] Moreover, it is preferable that the primary ruffle concretes 21, 22 are formed with approximately the same width.

[0026] The primary rapple concretes 21, 22 thus formed become axial members connecting the two pairs of opposing walls 12, 13 of the retaining wall 10 installed around the periphery of the construction section G1 of the rapple concrete, so that they are in the same state as a conventional strut is hung across, and can perform the function of supporting the opposing walls 12, 13 in the same way as a strut. In other words, the primary rapple concretes 21, 22 can also be expressed as "axially shaped rapple concrete also used as a strut, formed from a part of the rapple concrete 20 constructed over the entire construction section G1."

[0027] In this embodiment, by constructing the axial primary rapple concrete 21, 22 between the two pairs of opposing walls 12, 13 of the earth retaining wall 10, the primary rapple concrete 21, 22 can fulfill the function of supporting the earth retaining wall 10 in the same way as conventional braces, so that braces can be eliminated even in cases where conventional general braces are required, and an earth retaining wall can be formed that does not require braces. Furthermore, because braces are no longer required, the construction period and cost that were previously required to install braces can be reduced, and also, adverse effects of construction such as the labor required for excavation due to the presence of braces can be prevented, resulting in a reduction in the construction costs that were previously incurred to install braces.

[0028] In addition, it is also possible to provide only one of the primary rappel concretes 21, 22 and support only one of the two pairs of opposing walls 12, 13 of the retaining wall 10.

[0029] 2 and 3, by constructing a plurality of primary rapple concretes 21 at intervals, it becomes possible to provide support almost uniformly over the entire area of ​​the opposing walls 12 of the earth retaining wall 10 with the primary rapple concretes 21, so that the earth retaining wall 10 can be more reliably supported. The number of primary rapple concretes 21 connecting a pair of opposing walls 12 may be a single number, as in the case of the primary rapple concrete 22 shown in FIG. 3.

[0030] Next, in the fourth stage shown in Fig. 4, the secondary rapple concrete 23 is constructed around the primary rapple concretes 21 and 22, and the rapple concrete 20 is constructed over the entire construction section G1 (secondary rapple concrete construction process). In other words, the secondary rapple concrete 23 is constructed in the gaps between the primary rapple concretes 21 and 22, which are formed in a lattice shape, so that the primary rapple concretes 21 and 22 and the secondary rapple concrete 23 become an integrated rapple concrete 20.

[0031] The present embodiment has been described above with reference to specific examples. However, the present disclosure is not limited to these specific examples. Any design modifications made by a person skilled in the art to these specific examples are also included within the scope of the present disclosure as long as they have the features of the present disclosure. The elements of each of the above-mentioned specific examples and their arrangements, conditions, shapes, etc. are not limited to those exemplified and can be changed as appropriate. The combination of each of the elements of each of the above-mentioned specific examples can be changed as appropriate as long as no technical contradiction occurs. [Explanation of symbols]

[0032] 10 Mountain retaining wall 12, 13 Opposite walls 20 Rapple Concrete 21, 22 Primary rapple concrete (rapple concrete for use as bracing beams) 23 Secondary ruffle concrete G1 Construction area

Claims

1. A method for constructing rapple concrete, comprising the steps of: a diaphragm wall construction process for constructing a retaining wall around the construction area; A primary lapple concrete construction process for constructing an axial primary lapple concrete so as to connect a pair of opposing walls of the earth retaining wall; A secondary lapple concrete construction process for constructing a secondary lapple concrete around the periphery of the primary lapple concrete to construct the lapple concrete over the entire construction area; A method for constructing rapple concrete, comprising the steps of:

2. The retaining wall includes two pairs of the opposing walls, 2. The method for constructing rapple concrete according to claim 1, wherein in the first rapple concrete construction step, the first rapple concrete corresponding to the two pairs of opposing walls is constructed along two directions perpendicular to each other.

3. In the first wrap concrete construction step, a plurality of the first wrap concretes are constructed at intervals, 3. The method for constructing rapple concrete according to claim 1, wherein in the step of constructing the secondary rapple concrete, the secondary rapple concrete is constructed in the gap.

4. A braced rapple concrete that connects between a pair of opposing walls of a retaining wall provided around a construction area of ​​the rapple concrete, A rapple concrete structure that can also be used as a bracing beam is characterized in that it is formed from a part of the rapple concrete that is applied over the entire area of ​​the construction section and has an axial shape.

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