JP2017031779A - Earth-retaining structure and construction method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an earth-retaining structure which can be efficiently constructed.SOLUTION: An earth-retaining structure 1 comprises: an earth-retaining wall 3 which covers a side wall of an excavation region; a support 4 which is installed on the earth-retaining wall 3 and pushes the earth-retaining wall 3 against the side wall; an embedded member 6 which is installed on the earth-retaining wall 3 and has a connection section 9 exposed to the excavation region 2; and a protrusion member 7 which is installed on the support 4 and connected to the connection section 9 in a manner that protrudes from the earth-retaining wall 3 toward the excavation region 2. The earth-retaining wall 3 and the support 4 are connected to each other through the embedded member 6 and the protrusion member 7.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a mountain retaining structure and a method for constructing a mountain retaining structure.

  When excavating the ground and constructing the excavation area, there is a case where a mountain stop is made. The mountain retaining prevents the collapse of earth and sand constituting the side wall of the excavation area and the intrusion of spring water from the side wall into the excavation area. As shown in FIG. 5, a mountain retaining wall 101, a bulge 102, and a support work including a beam 103 and a fire hitting 104 are used for the mountain retaining. The erection 102 is disposed with respect to the retaining wall 101 so as to extend in the horizontal direction. The cut beam 103 is fixed to the erection 102 so as to be orthogonal to the erection 102. Further, one end of the fire striking 104 is fixed to the bulge 101 and the other end is fixed to the beam 103 so as to form a predetermined angle with respect to the bulge 101. Japanese Patent Application Laid-Open No. H10-228561 describes a fire-receiving metal used for retaining a mountain.

No. 7-513

  In the conventional mountain retaining that uses the firing of Patent Document 1, a step of forming a retaining wall, a step of excavating a region surrounded by the retaining wall, a step of arranging a support work, and the like are performed. In the field of such technology, it is desired to improve the efficiency of the retaining work.

  Then, an object of this invention is to provide the construction method of the mountain retaining structure in which efficient construction is possible, and a mountain retaining structure.

  A mountain retaining structure according to an embodiment of the present invention includes a mountain retaining wall that covers a sidewall of the excavation area, a support that is attached to the mountain retaining wall and presses the mountain retaining wall against the sidewall, and a connection that is provided on the mountain retaining wall and exposed to the excavation area. A first member having a portion, and a second member provided on the support and connected to the connecting portion so as to protrude from the retaining wall toward the excavation region, and the retaining wall and the supporting work, Are connected via a first member and a second member.

  The mountain retaining wall is provided with a first member for connecting the second member. If it does so, in attaching a support work to a mountain retaining wall, it will become possible to omit the process of arranging an erection. In addition, the first member already exists at the stage where the retaining wall is constructed. Therefore, it is possible to arrange the support work at a desired timing after the construction of the retaining wall. Therefore, in this mountain retaining structure, the process for arranging the support works is simplified, and the degree of freedom of the timing for arranging the support works is increased, so that efficient mountain construction can be performed.

  The connecting portion is along the wall surface on the excavation area side of the retaining wall. According to this configuration, since the connecting portion does not protrude from the wall surface on the excavation area side of the retaining wall, workability of excavation work using the retaining wall formed in advance is not deteriorated. Therefore, more efficient mountain fastening can be performed.

  In the mountain retaining structure, the mountain retaining wall is a continuous wall made of concrete. According to such a mountain retaining structure, the construction of the mountain retaining wall and the arrangement of the first member can be performed in the same process. Therefore, it is possible to further simplify the process of constructing the mountain retaining.

  Further, the support work may have a fire-fitting member, and the second member may be provided at an end of the fire-fitting member. Generally, the fire striking member is disposed so as to intersect with the normal direction of the wall body. Then, a force along the normal direction of the wall body and a force along the surface of the wall body act on the fire striking member. In this mountain retaining structure, a second member connected to the first member of the wall body is provided at the end of the fire striking member. If it does so, since the force along the surface of a wall body is supported by sufficient connection force between the 1st member and the 2nd member, it is not necessary to add a reinforcement member. Therefore, since the increase in the number of processes in construction of a mountain retaining structure is suppressed, efficient mountain retaining can be performed.

  Another embodiment of the present invention is a construction method of a mountain retaining structure including a retaining wall that covers a sidewall of an excavation area, and a support that is attached to the retaining wall and presses the retaining wall against the sidewall. And a first member having a connecting portion that is provided on the retaining wall and exposed to the excavation area, and is provided to the support and connected to the connecting portion so as to protrude from the retaining wall toward the excavating area. A step of forming a retaining wall including the first member connected to the second member, a step of forming an excavation region by excavating a region surrounded by the retaining wall, and an exposure to the excavation region Attaching the supporting work to the retaining wall by connecting the second member to the connecting portion.

  According to this construction method, after forming the retaining wall including the first member, the excavation region is formed to expose the connecting portion of the first member. And a 2nd member is connected to a connection part. If it does so, in attaching a support work to a mountain retaining wall, it will become possible to omit the process of arranging an erection. In addition, the first member already exists at the stage where the retaining wall is constructed. Therefore, it is possible to arrange the support work at a desired timing after the construction of the retaining wall. Therefore, in this mountain retaining structure, the process for arranging the support works is simplified, and the degree of freedom of the timing for arranging the support works is increased, so that efficient mountain construction can be performed.

  According to the mountain retaining structure and the method of constructing the mountain retaining structure according to the present invention, efficient construction is possible.

It is a top view which shows the excavation area | region in which the mountain retaining structure which concerns on this embodiment was provided. It is a top view which expands and shows the cross section of the connection part of a mountain retaining wall and a support work. The main process in the construction method of the mountain retaining structure which concerns on this embodiment is shown. It is a top view which expands and shows the cross section of the connection part of a retaining wall and a supporting work in the retaining structure which concerns on a modification. It is a perspective view for demonstrating the conventional mountain retaining structure.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a plan view showing an excavation region 2 in which a mountain retaining structure 1 is constructed. The excavation area 2 has a rectangular shape in plan view and is a space surrounded by the bottom surface 2a and the side wall 2b. A retaining structure 1 is provided inside the excavation region 2. The mountain retaining structure 1 has a mountain retaining wall 3 and a supporting work 4.

  The retaining wall 3 is disposed on each side wall 2b so as to cover the side wall 2b of the excavation region 2. The retaining wall 3 is a so-called cast-in-place reinforced concrete continuous underground wall (also referred to as an RC continuous wall). The mountain retaining wall 3 has a reinforcing bar 3a and a concrete part 3b, and the reinforcing bar 3a is embedded in the concrete part 3b (see FIG. 2).

  The mountain retaining wall 3 has a lower edge portion rooted in the bottom surface 2a. The mountain retaining wall 3 has a supporting force to such an extent that it can stand on its own by this insertion. Earth pressure acts on the mountain retaining wall 3 from the side wall 2b. Therefore, in order to prevent the mountain retaining wall 3 from falling to the excavation region 2 side due to earth pressure, a plurality of support works 4 are provided.

  The support work 4 is provided between the two retaining walls 3 provided so as to be orthogonal to each other. Therefore, the longitudinal direction of the support 4 is not perpendicular to the surface of the retaining wall 3 but is inclined 45 degrees. In this way, the reinforcing member that is slanted over the structure to be supported is also referred to as “fired”. Therefore, the support work 4 shown in FIG. 1 may be called a firework member.

  FIG. 2 is an enlarged plan view showing a cross section of a connecting portion between the retaining wall 3 and the support work 4. An embedded member (first member) 6 is provided on the mountain retaining wall 3. A protruding member (second member) 7 is provided at the end of the support work 4. The support work 4 is attached to the retaining wall 3 by the embedded member 6 and the protruding member 7.

  The embedded member 6 includes an embedded portion 8 embedded in the concrete portion 3 b of the retaining wall 3 and a connecting portion 9 exposed in the excavation region 2. The buried portion 8 is, for example, H-shaped steel, and extends along the thickness direction of the retaining wall 3. The embedded portion 8 has a flange 12 and a web 13, and the flange 12 or the web 13 is embedded in the concrete portion 3 b so as to be along the depth direction. In the present embodiment, the embedded member 6 is embedded in the concrete portion 3 b so that the flange 12 is along the depth direction of the excavation region 2.

  Further, the embedded portion 8 may be provided with a plurality of through holes 11. The plurality of through holes 11 are provided in a web 13 of H-shaped steel. Reinforcing bars constituting the reinforcing bar cage 3a are inserted into the through holes 11. According to the bar arrangement using the through hole 11, the embedded member 6 is more integrated with the retaining wall 3, so that the embedded member 6 is securely fixed to the retaining wall 3. Therefore, the supporting force with respect to the direction along the side wall 2b of the mountain retaining wall 3 can be increased. The end of the buried portion 8 on the excavation region 2 side is exposed from the concrete portion 3b, and a connecting portion 9 on a flat plate is provided at the end.

  The protruding member 7 is, for example, H-shaped steel, one end is welded to the connecting portion 9, and the other end is fixed to the support 4 using bolts. As described above, according to the structure in which at least one end portion of the protruding member 7 is fixed to another member by the bolt, the support member 4 that is a temporary member can be easily removed. In the protruding member 7, the direction from one end to the other end coincides with the extending direction of the support 4. In other words, the protruding member 7 is attached to the embedded member 6 so as to be bent. The angle between the embedded member 6 and the protruding member 7 depends on the angle between the retaining wall 3 and the support work 4.

  In the mountain retaining structure 1 according to the present embodiment, an embedded member 6 for connecting the protruding member 7 to the mountain retaining wall 3 is provided. Then, when attaching the supporting work 4 to the retaining wall 3, it becomes possible to omit the step of arranging the erection. Further, the embedded member 6 already exists at the stage where the mountain retaining wall 3 is constructed. Therefore, after the mountain retaining wall 3 is constructed, the supporting work 4 can be arranged at a desired timing. Therefore, in this mountain retaining structure 1, since the process for arrangement | positioning of the supporting work 4 is simplified and the freedom degree of the timing which arrange | positions the supporting work 4 increases, the construction of the efficient retaining structure 1 can be performed.

  The connecting portion 9 is along the wall surface 3 c on the excavation region 2 side of the retaining wall 3. According to this structure, since the connection part 9 does not protrude from the wall surface 3c on the excavation region 2 side in the retaining wall 3, workability of excavation work using the retaining wall 3 formed in advance is not deteriorated. Therefore, more efficient mountain fastening can be performed.

  The retaining wall 3 is a continuous wall made of reinforced concrete. According to the mountain retaining wall 3, the construction of the mountain retaining wall 3 and the arrangement of the embedded member 6 can be performed in the same process. Therefore, the process of constructing the mountain retaining structure 1 can be further simplified.

  Moreover, the support work 4 is a fire-ignition member. The protruding member 7 is provided at the end of the support 4. In general, in the mountain retaining structure, the fire striking member is disposed so as to intersect the normal direction of the mountain retaining wall 3. Then, a force along the normal direction of the retaining wall 3 and a force along the surface of the retaining wall 3 act on the fire striking member. In the mountain retaining structure 1, a projecting member 7 connected to the embedded member 6 of the mountain retaining wall 3 is provided at the end of the support work 4. Then, since the force along the surface of the retaining wall 3 is supported by a sufficient coupling force between the embedded member 6 and the protruding member 7, it is not necessary to add a reinforcing member. Therefore, since the increase in the number of processes in construction of the mountain retaining structure 1 is suppressed, efficient construction of the mountain retaining structure 1 can be performed.

  Further, the mountain retaining wall 3 can be applied regardless of the surrounding conditions and soil quality. In particular, when applied to deep excavation, the effect of reducing anchors and upsets is further enhanced.

  Next, the construction method of the mountain retaining structure will be described. FIG. 3 shows main steps in the construction method according to the present embodiment.

  First, as shown in FIG. 3A, the retaining wall 3 is constructed. More specifically, after the trench 14 is constructed, the reinforcing bar 3a (see FIG. 2) is disposed in the trench 14. At this time, the embedded member 6 is also arranged in the trench 14 together with the arrangement of the reinforcing bar 3a. For example, the embedded member 6 is attached to the reinforcing bar 3a in advance. Then, the reinforcing bar basket 3 a to which the embedded member 6 a is attached is inserted into the trench 14. Thereafter, concrete is placed in the trench 14 to embed the reinforcing bar 3a and the embedded portion 8 of the embedded member 6 (see FIG. 2).

  Next, as shown in FIG. 3B, a region A surrounded by the retaining wall 3 is excavated. This excavation is performed until at least the embedded member 6 disposed on the most ground side is exposed. Since the embedded member 6 is along the wall surface 3c on the excavation region 2 side of the retaining wall 3, it is difficult to hinder excavation. When the earth and sand in the region surrounded by the retaining wall 3 is removed, the connecting portion 9 of the embedded member 6 is exposed to the excavation region 2.

  Next, as shown in FIG. 3 (c), the support work 4 is attached to the retaining wall 3. A protruding member 7 is fixed to the end of the support 4 in advance by bolts. The projecting member 7 is abutted against the connecting portion 9, and the projecting member 7 and the connecting portion 9 are fixed to each other by welding. By this step, a region A in which the support work 4 is temporarily installed is formed.

  Note that when forming a deeper region A, the bottom of the region A is excavated again as shown in FIG. This excavation is performed until at least the next embedded member 6 is exposed. Then, a new support work is attached to the embedded member 6.

  As described above, the step of excavating and the step of attaching the support 4 to the exposed embedded member 6 are repeated, and finally, the excavation region 2 having a desired depth is constructed by removing the support 4. At this time, the support member 4 and the protruding member 7 may be separated, or the protruding member 7 and the embedded member 6 may be separated.

  According to this construction method, after the mountain retaining wall 3 including the embedded member 6 is formed, the excavation region 2 is formed and the connecting portion 9 of the embedded member 6 is exposed. Then, the protruding member 7 is connected to the connecting portion 9. Then, when attaching the supporting work 4 to the retaining wall 3, it becomes possible to omit the step of arranging the erection. Further, the embedded member 6 already exists at the stage where the mountain retaining wall 3 is constructed. Therefore, after the mountain retaining wall 3 is constructed, the supporting work 4 can be arranged at a desired timing. Therefore, in this mountain retaining structure 1, since the process for arrangement | positioning of the supporting work 4 is simplified and the freedom degree of the timing which arrange | positions the supporting work 4 increases, the construction of the efficient retaining structure 1 can be performed.

  Here, assuming that the embedded member 6 and the protruding member 7 are parts integrated in advance, the protruding member protrudes considerably from the mountain retaining wall toward the excavation area. If it does so, at the time of construction of an excavation area (refer to Drawing 3 (b) and (d)), workability of excavation work may fall by a projection member. Specifically, when the protruding member is present, it is difficult to insert the structural member (for example, the reinforcing steel basket 3a) having the protruding member into the trench during construction of the retaining wall (see FIG. 3A). On the other hand, in the mountain retaining structure 1 of the present embodiment, the embedded member 6 and the protruding member 7 for attaching the support 4 to the mountain retaining wall 3 are separate members, and the excavation area is constructed (FIG. 3B, ( In d)), the protruding member 7 does not exist. If it does so, the inconvenience as mentioned above will not arise at the time of construction of the retaining wall 3, and the protruding member 7 will not hinder excavation work. Therefore, it is possible to suppress a decrease in workability of excavation work.

  Further, according to this construction method, the excavation area is deepened while arranging the support works 4. Then, excavation work can be performed while securing the strength of the retaining wall 3, so that the safety of the work in the construction of the retaining structure 1 can be improved.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

  For example, as shown in FIG. 4, the embedding member 6 may be disposed such that the flange 12 is parallel to the thickness direction of the retaining wall 3.

DESCRIPTION OF SYMBOLS 1 ... Mountain retaining structure, 2 ... Excavation area | region, 2b ... Side wall, 3a ... Reinforcement basket, 3b ... Concrete part, 4 ... Supporting work (fired member), 6 ... Embedded member (1st member), 7 ... Projection member (1st 2), 8 ... buried portion, 9 ... connecting portion, 11 ... through hole, 12 ... flange, 13 ... web, 14 ... trench.

Claims (5)

A retaining wall covering the side wall of the excavation area;
A supporting work attached to the retaining wall and pressing the retaining wall against the side wall;
A first member provided on the retaining wall and having a connecting portion exposed to the excavation area;
A second member provided on the support and connected to the connecting portion so as to protrude from the mountain retaining wall toward the excavation region;
The mountain retaining structure in which the mountain retaining wall and the support work are connected via the first member and the second member.   The mountain retaining structure according to claim 1, wherein the connecting portion is along a wall surface on the excavation area side of the mountain retaining wall.   The mountain retaining structure according to claim 1 or 2, wherein the mountain retaining wall is a continuous wall made of concrete. The support work has a fire-ignition member,
The mountain retaining structure according to any one of claims 1 to 3, wherein the second member is provided at an end of the fire striking member. A method of constructing a retaining structure comprising: a retaining wall that covers a sidewall of an excavation area; and a support that is attached to the retaining wall and presses the retaining wall against the sidewall.
The mountain retaining wall and the supporting work are provided on the mountain retaining wall and having a connecting portion exposed to the excavation area, and provided on the supporting work, from the mountain retaining wall toward the excavation area. Connected via a second member coupled to the coupling part so as to protrude,
Forming the retaining wall including the first member;
Forming the excavation area by excavating an area surrounded by the retaining wall;
Attaching the supporting member to the mountain retaining wall by coupling the second member to the coupling part exposed in the excavation region.

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