JP2011231553A - Support structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for supporting an earth-retaining wall that can be constructed in a short time and at a low cost.SOLUTION: A support structure 3 for supporting an earth-retaining wall 2 comprises an annular support member 4 and a supporting material 5. The supporting material 5 comprises a plurality of brackets 5a and a rail 5b installed between the adjoining brackets 5a. The support member 4 is installed to stick to an inner peripheral surface of the earth-retaining wall 2 in a state of being suspended from the bracket 5a and the rail 5b. The support member 4 is constructed by installing annularly a plurality of bag bodies 4a that is swollen in an arc shape with a hardening filler 4b filled in the support member 4.

Description

  The present invention relates to a support structure for supporting a circular earth retaining wall installed in a vertical shaft.

  A plurality of H-shaped steels bent in an arc along the inner peripheral surface of the circular earth retaining wall installed in the shaft are assembled to form an annular shape, and then the H-shaped steel and the earth retaining wall are assembled. There is a construction method that supports the earth retaining wall by placing mortar so that there is no gap between them.

  In addition, for example, Patent Document 1 discloses a multi-stage structure in which a plurality of annular concrete structures constructed so as to be in close contact with the inner peripheral surface of the earth retaining wall are stacked and finally the inner peripheral surface is completely covered. A construction method is disclosed in which a concrete structure is constructed and a retaining wall is supported by the concrete structure.

JP-A-4-285290

  However, in the method of supporting the retaining wall with H-shaped steel etc., the H-shaped steel produced in a straight line must be processed so as to be the same as the curvature of the retaining wall, which takes time and production costs. There was a problem of becoming high. In addition, there has been a problem that placing the mortar after installing the H-shaped steel or the like requires time and labor for installing and removing the formwork, and the construction period becomes longer.

  Moreover, in the construction method described in Patent Document 1, a concrete structure having a multi-stage structure that completely covers the inner peripheral surface of the retaining wall is constructed, so that a large amount of concrete is required, which increases the material cost. There was a problem.

  Therefore, the present invention has been made in view of the above-described problems, and an object of the present invention is to provide a retaining wall support structure that can be constructed in a short time and at low cost without taking time and effort.

The present invention is a support structure for supporting a circular earth retaining wall,
An annular support member installed so that the inside of the bag body is filled with a curable filler and is in close contact with the inner peripheral surface of the earth retaining wall;
A support member attached to the inner peripheral surface of the earth retaining wall and supporting the support member in a suspended state; and
In a state where the support member is suspended from the support member, a suspension fulcrum of the support member is located on a radially outer side of the retaining wall with respect to a center of gravity position of the support member.

  In the present invention, the supporting member may be provided in a plurality of stages at a predetermined interval in the height direction of the retaining wall.

  ADVANTAGE OF THE INVENTION According to this invention, the retaining structure of the retaining wall which can be constructed | assembled in a short time and cheaply without taking an effort can be provided.

It is a top view which shows the support structure which supports the earth retaining wall installed in the circular shaft. It is AA sectional drawing of FIG. It is the B section enlarged view of FIG. It is C arrow line view of FIG. It is a figure which shows the example which supports a supporting member via a wire rope. It is a figure which shows the other example of a shape of a vertical shaft. (A) The figure which shows the example which provided the arc-shaped reinforcement in the bag, (b) The figure which shows the example which provided the linear reinforcement in the bag.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a plan view showing a support structure 3 that supports a cylindrical earth retaining wall 2 installed in a circular shaft 1. FIG. 2 is a cross-sectional view taken along the line AA in FIG. 3 and FIG. 4 are an enlarged view of a portion B in FIG. 2 and a view in the direction of arrow C in FIG. 3, respectively.

  As shown in FIGS. 1 to 4, the support structure 3 that supports the retaining wall 2 includes an annular supporting member 4 along the inner peripheral surface of the retaining wall 2 and a support member 5.

  The support member 5 includes a plurality of brackets 5a and rails 5b installed between adjacent brackets 5a.

  The brackets 5a are attached to the inner peripheral surface of the earth retaining wall 2 at predetermined intervals in the circumferential direction. Between the adjacent brackets 5a, arc-shaped rails 5b are installed along the inner peripheral surface of the earth retaining wall 2.

  The support member 4 is installed so as to be in close contact with the inner peripheral surface of the earth retaining wall 2 while being suspended from the bracket 5a and the rail 5b.

  The supporting members 4 are installed in a plurality of stages at predetermined intervals in the height direction of the retaining wall 2. The installation interval and the number of installations of the support members 4 are appropriately determined by design or the like based on site conditions such as geology and groundwater level.

  Further, the support member 4 is constructed by installing a plurality of bags 4 a that are filled with a curable filler 4 b and expanded in an arc shape in an annular shape along the inner peripheral surface of the retaining wall 2. The

  The curable filler 4b is filled from the inlet 8 provided on the upper portion of the bag body 4a in a state where the bag body 4a is suspended from the bracket 5a or the rail 5b. In the present embodiment, concrete is used as the curable filler 4b. However, the present invention is not limited to this. For example, steel fiber reinforced concrete, mortar, resinous hardener, or the like may be used.

  As the bag body 4a, a bag body having a strength that does not break even when suspended in a state of being filled with the curable filler 4b is used. In the present embodiment, the bag body 4a made of polypropylene having a high tensile strength is used. However, the bag body 4a is not limited to this material and is suitable for use based on the weight of the curable filler 4b. The bag 4a made of the selected material is appropriately selected.

  Each bag 4a is suspended from the bracket 5a or the rail 5b, with the edge of the retaining wall 2 side of the lower surface of the bracket 5a or the lower surface of the rail 5b as a suspension fulcrum 9.

  As shown in FIG. 3, the suspension fulcrum 9 of the bag body 4a is located closer to the retaining wall 2 side (corresponding to the radially outer side) than the center of gravity position 10 of the bag body 4a filled with the curable filler 4b. To be provided. Thus, since the suspension fulcrum 9 of the support member 4 is provided on the retaining wall 2 side with respect to the center of gravity of the support member 4, a force having a radially outward component acts on the support member 4 due to its own weight. However, the support member 4 can be brought into close contact with the inner peripheral surface of the retaining wall 2 by this force.

  Moreover, since the bracket 5a is attached to the inner peripheral surface of the earth retaining wall 2 at a predetermined interval, the support member 4 can be supported with a force of an equal size.

  By the way, when a part of the annular support member 4 is bent downward and the height of the support member 4 varies depending on the location, the load from the earth retaining wall 2 is concentrated on the part, and the support member 4 may be damaged. There is. On the other hand, in this embodiment, since the bag 4a is supported by the rail 5b not only between the brackets 5a but also between the adjacent brackets 5a, the height of the support member 4 can be kept constant. Thereby, the bending of the supporting member 4 can be prevented. Therefore, damage to the support member 4 as described above can be prevented.

  Moreover, since the support member 4 can be constructed only by filling the bag body 4a with the curable filler 4b, the support structure 3 of the retaining wall 2 can be constructed in a short time. Furthermore, since the supporting member 4 is composed of a plurality of bag bodies 4a, the time can be shortened more effectively by performing the filling operation of the curable filler 4b to each bag body 4a in parallel. Can do.

  In addition, the support structure according to the present invention is compared to the case where a plurality of annular concrete structures described in the background art section are stacked and finally a multi-stage concrete structure that completely covers the inner peripheral surface is constructed. Since the members 4 are installed at predetermined intervals in the height direction, the amount of concrete to be used can be greatly reduced when supporting the retaining wall 2 having the same height. Therefore, the support structure 3 can be constructed at a lower cost than when a multi-stage concrete structure is constructed. Furthermore, since the number of steps of the support member 4 according to the present invention is smaller than the number of steps of the multi-stage concrete structure, the support structure 3 can be constructed in a shorter time.

  In addition, in this embodiment, although the support member 4 demonstrated the case where it comprised from the some bag body 4a, it is not limited to this, The cyclic | annular bag body 4a is filled with the curable filler 4b. Then, a single support member 4 may be constructed.

  In addition, in this embodiment, although the case where the suspension fulcrum 9 of the supporting member 4 was provided in the retaining wall 2 side edge part was demonstrated, it is not limited to this position and is filled with the curable filler 4b. It is only necessary that the suspension fulcrum 9 is provided closer to the retaining wall 2 than the center of gravity position 10 of the support member 4.

In the present embodiment, the method of directly supporting the upper end portion of the support member 4 with the bracket 5a and the rail 5b has been described. However, the present invention is not limited to this, and as shown in FIG. The support member 4 may be hung.
In such a case, the installation interval of the wire ropes 11 is appropriately determined by design or the like so that the supporting member 4 between the adjacent wire ropes 11 is not bent downward, and the lengths of all the wire ropes 11 are made the same. The entire circumference of the support member 4 is adjusted to be the same height.

  In addition, in this embodiment, although the case where the support structure 3 was installed in the circular shaft 1 was demonstrated, this "circle" is not limited to a perfect circle, As shown in FIG. 6, it is short. It also includes polygonal shapes consisting of sides. When the steel sheet pile 13 is used as the retaining wall 2 in the polygonal vertical shaft 12, it is desirable to use the bag body 4c which becomes linear when filled with the curable filler 4b. This is because the bag 4c can be adhered to the side surface of the steel sheet pile 13.

  Moreover, as shown in FIG. 7A and FIG. 7B, bag bodies 4a and 4c in which arc-shaped reinforcing bars 6 or linear reinforcing bars 7 are provided at the lower end may be used. Since the reinforcing bars 6 and 7 are present at the lower ends of the bag bodies 4 a and 4 c, the support member 4 can be prevented from being bent, and the support member 4 can be prevented from being damaged due to the concentration of the load from the earth retaining wall 2.

DESCRIPTION OF SYMBOLS 1 Shaft 2 Earth retaining wall 3 Support structure 4 Support member 4a Bag body 4b Curable filler 4c Bag body 5 Support material 5a Bracket 5b Rail 6 Arc-shaped reinforcement 7 Linear reinforcement 8 Inlet 9 Suspension fulcrum 10 Center of gravity 11 Wire rope 12 Vertical shaft 13 Steel sheet pile

Claims (2)

A support structure for supporting a circular earth retaining wall,
An annular support member installed so that the inside of the bag body is filled with a curable filler and is in close contact with the inner peripheral surface of the earth retaining wall;
A support member attached to the inner peripheral surface of the earth retaining wall and supporting the support member in a suspended state; and
The support structure, wherein the support member is suspended from the support member, and the suspension fulcrum of the support member is located radially outside the retaining wall with respect to the center of gravity of the support member. .   The support structure according to claim 1, wherein the support members are provided in a plurality of stages at a predetermined interval in the height direction of the retaining wall.

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