JP2006316474A - Construction method for concrete retaining wall - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the reliability of construction while reducing construction costs in the construction of a concrete retaining wall for covering a slope. <P>SOLUTION: After a plurality of separator connecting implements 10 with flanges 10a formed at their base ends are temporarily fixed to the slope 2a in a state of being arranged at predetermined intervals among them along the slope 2a of the natural ground 2. Subsequently, mortar 6 is sprayed on the slope 2a, so that the base end of each of the implements 10 can be fixed to the slope 2a. After that, the base end of a separator 20 is connected to the leading end of each of the implements 10; a sheathing board 22 is installed at the leading end of each of the separators 20 in parallel with the slope 2a; and concrete is placed between the sheathing board 22 and the slope 2a. Thus, reaction for countering a tensile force acting on the separator 20 by using pressure acting on the sheathing board 22 from the placed concrete is secured by the implements 10 and the mortar 6. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a concrete retaining wall construction method for constructing a concrete retaining wall that covers a slope.

  Conventionally, a method of constructing a concrete retaining wall that covers a slope is known as a method for protecting a slope such as a natural ground.

  In this concrete retaining wall construction method, a concrete retaining wall is constructed by installing a dam plate so as to be substantially parallel to the slope and placing concrete between the dam and the slope. It has become. At that time, the dam plate is installed through a plurality of separators, and a predetermined tension is applied to each of the separators by the pressure acting on the dam plate from the placed concrete. It is necessary to make the reaction force for the slope face.

  Therefore, conventionally, an anchor is driven into the slope and the base end of the separator is connected to the tip of the anchor, or the separator itself is used as the slope as described in “Patent Document 1”. The device is devised.

Japanese Patent Laid-Open No. 11-210004

  In the conventional concrete retaining wall construction method described above, the required reaction force is secured by the anchor or separator driven into the slope, so that the placement until reaching a position at a certain depth from the slope. There is a need to do.

  However, when the ground constituting the slope is soft, it is necessary to drive to a considerable depth. For this reason, it is necessary to use a long anchor or separator. In addition, when the ground constituting the slope is solid, it is not easy to drive the anchor or the separator to the required depth.

  Therefore, in the conventional concrete retaining wall construction method described above, the construction efficiency is poor, and thus construction costs are required, and quantitative construction management is difficult, so that the construction reliability can be sufficiently secured. There is a problem that it is not possible.

  The present invention has been made in view of such circumstances, and a concrete retaining wall construction method capable of reducing the construction cost when constructing a concrete retaining wall covering a slope and enhancing the reliability of construction. Is intended to provide.

  In the present invention, a predetermined separator connecting jig is used instead of a conventional anchor, and this is fixed to a slope by spraying mortar, thereby achieving the above object.

That is, the concrete retaining wall construction method according to the present invention is:
In the concrete retaining wall construction method of constructing the concrete retaining wall covering the slope,
A plurality of separator coupling jigs having flange portions formed at the base end are temporarily fixed to the slope in a state of being arranged at predetermined intervals along the slope, and then mortar is sprayed on the slope. By fixing the base end portion of each separator connecting jig to the slope,
Thereafter, the base end of the separator is connected to the tip of each separator connecting jig, and a dam plate is installed at the tip of each separator so as to be substantially parallel to the slope, Concrete is placed between the slope and the slope.

  Each of the above “separator connection jigs” has a flange portion formed at the base end portion thereof, and can be connected to the base end portion of the separator at the tip end portion thereof. Specific configurations such as size and material are not particularly limited.

  A specific method for “temporarily fixing” each of the separator connecting jigs to the slope is to use the separator connecting jigs until fixing to the slope by mortar spraying performed after the temporary fixing. As long as it can be positioned and held at a predetermined position on the surface, it is not limited to a specific method.

  If the "mortar" spraying on the slope is performed in such a manner that the base end portion of each separator coupling jig can be fixed to the slope, it may be performed over the entire slope. Alternatively, it may be performed only in the vicinity of the base end portion of each separator coupling jig.

  The specific method for performing the “connection” between the distal end portion of each separator connection jig and the base end portion of each separator is not particularly limited, and for example, connection by screwing or fitting can be employed. It is.

  As shown in the above configuration, in the concrete retaining wall construction method according to the present invention, a plurality of separator connecting jigs having a flange portion formed at the base end portion are arranged at predetermined intervals along the slope. In this state, the base end of each separator coupling jig is fixed to the slope by spraying mortar on the slope, and then the separator is fixed to the tip of each separator coupling jig. The base end is connected, and a dam plate is installed at the tip of each separator so as to be substantially parallel to the slope, and concrete is placed between the dam and the slope. Therefore, the following effects can be obtained.

  That is, the separator coupling jig temporarily fixed to the slope is fixed to the slope by mortar spraying, and then a predetermined tension is applied to the separator by the pressure acting on the barrier plate from the placed concrete. Even so, a reaction force to counter this tension can be ensured by the separator connecting jig and the mortar.

  At that time, the fixing of the separator connecting jig to the slope is performed by temporarily fixing the separator connecting jig and spraying the mortar. The fixing to the surface can be easily performed, and thereby the construction efficiency can be increased.

  Also, the reaction force to counter the tension acting on the separator does not depend on the pulling resistance force of an anchor or the like as in the prior art, but the separator connecting jig and the like using the pressure of the placed concrete Since it is secured by mortar, quantitative construction management can be performed.

  Therefore, according to this invention, the construction cost at the time of constructing the concrete retaining wall which covers a slope can be aimed at, and the reliability of the construction can be improved.

  In the above configuration, as described above, the specific method for temporarily fixing each separator coupling jig to the slope is not particularly limited. However, for this temporary fixation, a rod-shaped member is driven in advance on the slope. At the same time, if the separator connecting jig is attached to the rod-shaped member, the configuration of the separator connecting jig is simplified, and the separator connecting jig is temporarily fixed to the slope. It can be done reliably.

  Alternatively, instead of doing this, a bar-like projection is provided in advance on the separator coupling jig, and if this rod-like projection is driven into the slope, the necessary equipment can be reduced. .

  In these cases, it is sufficient that the rod-like member or rod-like protrusion is driven into the slope to the extent necessary for temporary fixing of the separator connecting jig, and it is pulled out when casting concrete like a conventional anchor. Since it is not necessary to secure a reaction force to counteract the force, it can be easily performed by making a shallow drill hole in the slope and inserting a rod-shaped member or rod-shaped protrusion into the drill hole. At that time, if the ground constituting the slope is relatively soft, it is possible to directly drive the rod-shaped member or the rod-shaped protrusion to the slope, thereby making it possible to perform the driving operation more easily.

  In the above configuration, before the mortar is sprayed on the slope, if a lath wire mesh is attached to the slope, the reaction force against the tension acting on the separator can be applied not only to the separator connecting jig and mortar. Since it can be secured by a lath wire mesh, the construction reliability can be further enhanced.

  When the lath wire mesh is attached to the slope in this way, temporary fixing to the slope of each separator coupling jig is performed by locking the flange portion of the separator coupling jig to the lath wire mesh. It is also possible to do so. In such a case, it becomes possible to eliminate the need to drive the rod-shaped member or the rod-shaped protrusion into the slope, thereby further improving the construction efficiency. At that time, it is possible to use both the locking to the lath wire mesh and the driving to the slope, and in this case, the reliability of construction can be further enhanced.

  In the above configuration, as described above, there is no particular limitation on the method of connecting the tip end portion of each separator connecting jig and the base end portion of each separator. However, a screw hole is provided at the tip end portion of each separator connecting jig. In addition to forming the threaded portion at the base end of each separator, the separator is connected to each separator connecting jig by screwing the separator to the separator connecting jig. If it makes it, construction can be performed using a general-purpose separator, and thereby the construction cost reduction effect can be enhanced.

  In the above configuration, if each separator connecting jig is manufactured by bending a metal plate, the separator connecting jig which is embedded in the placed concrete and does not divert can be manufactured at low cost. It can be manufactured, and thereby the construction cost reduction effect can be further enhanced.

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

  FIG. 1 is a side sectional view of a construction site showing a concrete retaining wall construction method according to an embodiment of the present invention. 2 is a detailed view of a portion II in FIG. 1, and FIG. 3 is a detailed cross-sectional view taken along the line III-III in FIG.

  As shown in these drawings, the concrete retaining wall construction method according to the present embodiment is a method of constructing a concrete retaining wall 4 leaning on the slope 2a of the natural ground 2 and covering it as a retaining wall, and the outline of the process is as follows. It is as follows.

  That is, a plurality of separator connecting jigs 10 having a flange portion 10a formed at the base end portion are temporarily fixed to the slope 2a in a state where they are arranged at predetermined intervals along the slope 2a of the natural ground 2. Thereafter, the base end of each separator coupling jig 10 is fixed to the slope 2 a by spraying mortar 6 on the slope 2 a, and then the base end of the separator 20 on the tip of each separator coupling jig 10. In addition, a barrier plate 22 is installed at the tip of each separator 10 so as to be parallel to the slope 2a, and concrete is placed between the barrier plate 22 and the slope 2a. Yes.

  At that time, as each separator connecting jig 10, a jig main body 10 </ b> A having a nut 10 </ b> B welded to the tip is used.

  The jig body 10A is manufactured by bending a metal plate. That is, the jig body 10A is bent in a U-shape at the distal end portion thereof, and is bent at right angles to both sides at the base end portions of a pair of intermediate portions extending in parallel from the distal end portion. A pair of flange portions 10a are formed. Further, a pair of tab portions 10b are formed so as to be bent inward on both sides of the vicinity of the base end portion in each intermediate portion of the jig body 10A. Further, a through hole larger than the screw diameter of the nut 10B is formed at the tip of the jig body 10A. In the jig body 10A, the distance between the pair of intermediate portions and the distance between the pair of tab portions 10b are set to be approximately the same as the diameter of the rod-shaped member 12.

  Next, the steps of the concrete retaining wall construction method according to the present embodiment will be described in detail with reference to FIGS.

  First, as shown in FIG. 4, with respect to the slope 2a of the natural ground 2, a plurality of shallow drill holes 2b are formed at predetermined intervals in the vertical and horizontal directions, and the rod-like member 12 is formed in each of these drill holes 2b. Type in. At that time, the diameter of each drill hole 2b is set to be approximately the same as the diameter of the rod-shaped member 12, so that the rod-shaped member 12 can be driven easily. In addition, a deformed steel rod having a predetermined length is used as the rod-like member 12 to ensure adhesion with the inner wall of the drill hole 2b. Then, the rod-like member 12 that has been driven in has its tip portion protruded from the slope 2a to some extent.

  Next, as shown in FIG. 5, the separator coupling jigs 10 are respectively attached to the respective rod-like members 12, thereby temporarily fixing the separator coupling jigs 10 to the slope 2a. At that time, the separator connecting jig 10 is attached to the rod-shaped member 12 by inserting the rod-shaped member 12 into a gap surrounded by the pair of intermediate portions and the pair of tab portions 10b of the jig body 10A. Do.

  Next, as shown in FIG. 6, the mortar 6 is sprayed on the slope 2a to fix the base end portion of each separator connecting jig 10 to the slope 2a. The spraying of the mortar 6 is performed with substantially the same thickness (for example, about 50 mm) over the entire area of the slope 2a so that about half of each separator connecting jig 10 is embedded. At the time of this mortar spraying, the through hole formed at the tip of the jig body 10A and the screw hole of the nut 10B in each separator connecting jig 10 are prevented from being inadvertently blocked by the mortar. Therefore, it is preferable to wind a vinyl tape or the like around the tip of each separator coupling jig 10.

  Thereafter, as shown in the figure, the base end of the separator 20 is connected to the tip of each separator connecting jig 10. At that time, all the screw bolts are used as the separator 20, and are connected to the nut 10 </ b> B of the separator connecting jig 10 by screwing.

  Next, as shown in FIG. 7, a plastic cone 24 is connected to the tip of each separator 20. This connection is performed by screwing the female screw portion 24 a of the plastic cone 24 to the tip portion of the separator 20.

  Instead of doing this, the separator 20 may be connected to the separator connecting jig 10 in a state where the plastic cone 24 is connected to the separator 20 in advance.

  Next, as shown in FIG. 8, the dam plate 22 is brought into contact with the mold receiving surface of each plastic cone 24, and the dam plate 22 is installed so as to be parallel to the slope 2a. At that time, a plurality of appropriately sized dam plates 22 are used as the dam plates 22, and the end surfaces thereof are arranged in close contact with each other. Each of the barrier plates 22 is installed by inserting the male screw portion 24b of the plastic cone 24 into the small hole 22a formed in the barrier plate 22. Then, a plurality of vertical beam pipes 26 are brought into contact with the plurality of dam plates 22 installed as described above from the back side.

  Next, as shown in FIG. 9, after connecting the base end portion of the foam tie 28 to the male screw portion 24b of each plastic cone 24 protruding to the back side of the barrier plate 22 by screwing, The horizontal beam pipes 30 are arranged on both the upper and lower sides, the clamps 32 are inserted into the tip portions of the respective foam ties 28, and the both horizontal beam round pipes 30 are pressed against the vertical beam angle pipe 26 by the clamps 32. Then, the installation of each barrier plate 22 is completed by tightening the nut 34 to the foam tie 28.

  Then, as shown in FIG. 10, the concrete retaining wall 4 is constructed by placing concrete between the plurality of barrier plates 22 installed so as to be parallel to the slope 2a and the slope 2a.

  At that time, a predetermined tension acts on each separator 20 by the pressure acting on the barrier plate 22 from the placed concrete, but the pressure of the placed concrete is applied to the mortar 6 sprayed on the slope 2a. Since this also acts on each separator connecting jig 10 via this mortar 6, a reaction force for countering the tension of each separator 20 is secured by each of these separator connecting jig 10 and mortar 6. Thus, each barrier plate 22 is maintained in a state of being installed in parallel with the slope 2a.

  As described above in detail, in the concrete retaining wall construction method according to the present embodiment, a plurality of separator connecting jigs 10 each having a flange portion 10a formed at the base end portion are provided along the slope 2a of the natural ground 2. After temporarily fixing to the slope 2a in a state of being spaced apart from each other, the base end portion of each separator connecting jig 10 is fixed to the slope 2a by spraying the mortar 6 on the slope 2a, In addition, the base end of the separator 20 is connected to the tip of each separator connecting jig 10, and the barrier plate 22 is installed at the tip of each separator 20 so as to be parallel to the slope 2a. Since concrete is cast between the slope 22 and the slope 2a, the following effects can be obtained.

  That is, the separator coupling jig 10 temporarily fixed to the slope 2a is fixed to the slope 2a by mortar spraying, and then applied to the separator 20 by the pressure acting on the barrier plate 22 from the placed concrete. Even if a predetermined tension is applied, a reaction force to counter this tension can be secured by the separator connecting jig 10 and the mortar 6.

  At that time, the separator fixing jig 10 is temporarily fixed to the slope 2a by temporary fixing of the separator connecting jig 10 and mortar spraying. Thus, the fixing to the slope 2a can be easily performed, thereby improving the construction efficiency.

  Further, the reaction force for countering the tension acting on the separator 20 does not depend on the pulling resistance force of an anchor or the like as in the prior art, but the separator connecting jig using the pressure of the placed concrete. Since 10 and the mortar 6 ensure, quantitative construction management can be performed.

  Therefore, according to this embodiment, the construction cost at the time of constructing the concrete retaining wall 4 covering the slope 2a of the natural ground 2 can be reduced, and the reliability of the construction can be enhanced.

  In particular, in the present embodiment, each separator coupling jig 10 is temporarily fixed to the slope 2a, and a rod-shaped member 12 is driven in advance on the slope 2a, and the separator coupling jig 10 is attached to the rod-shaped member 12. Thus, the configuration of the separator connecting jig 10 can be simplified and the temporary fixing of the separator connecting jig 10 to the slope 2a can be reliably performed.

  At this time, it is sufficient that the rod-like member 12 is driven into the slope 2a to the extent necessary for temporarily fixing the separator connecting jig 10, and the pulling force at the time of concrete pouring is counteracted like a conventional anchor. Therefore, it is not necessary to secure a reaction force for the purpose of drilling, so that a shallow drill hole 2b is formed in the slope 2a and the rod-like member 12 is driven (or inserted) into the drill hole 2b. . At that time, if the ground constituting the slope 2a of the natural ground 2 is relatively soft, it is possible to directly drive the rod-like member 12 into the slope 2a, thereby making it possible to perform the driving work more easily. .

  Further, in this embodiment, each separator coupling jig 10 is configured such that a nut 10B is welded to the tip of the jig body 10A, and all the screw bolts are used as the separators 20. Since the separator 20 is connected to the separator connecting jig 10 by screwing the separator 20 to the separator connecting jig 10, the general-purpose separator 20 can be used for construction. The construction cost reduction effect can be enhanced.

  Further, in the present embodiment, the jig body 10A of each separator coupling jig 10 is manufactured by bending a metal plate, so that it can be diverted by being embedded in the placed concrete. The useless separator coupling jig 10 can be manufactured at low cost, and the construction cost reduction effect can be further enhanced.

  In addition, in the said embodiment, before installing the barrier plate 22, it is also possible to make the concrete retaining wall 4 into a reinforced concrete structure by assembling a reinforcing bar appropriately and arrange | positioning along the slope 2a.

  Moreover, in the said embodiment, although demonstrated as what uses the nut 10B welded to the front-end | tip part of the jig | tool main body 10A as the separator connection jig | tool 10, it is directly screwed in the front-end | tip part of the jig | tool main body 10A. In this case, the nut 10B need not be welded.

  Next, a modification of the above embodiment will be described.

  First, a first modification of the above embodiment will be described.

  FIG. 11 is a view similar to FIG. 5 showing a concrete retaining wall construction method according to this modification.

  As shown in the figure, this modification is different from the above embodiment in that a separator connecting jig 110 is used instead of the separator connecting jig 10 of the above embodiment. The process is the same as in the above embodiment.

  The separator connecting jig 110 is formed with an annular flange portion 110a at the base end portion and a rod-like protrusion 110b at the center of the base end portion, and a screw hole for connecting the separator at the tip end portion. 110c is formed and is manufactured by casting or the like.

  In this modification, the rod-shaped protrusion 110b of each separator connecting jig 110 is driven (or inserted) into each drill hole 2b of the slope 2a, whereby the method of each separator connecting jig 110 is obtained. Temporary fixing to the surface 2a is performed.

  By adopting the method of this modification, it is possible to eliminate the need to drive the bar-shaped member 12 into the slope 2a in advance as in the case of the above-described embodiment, and thus the equipment necessary for the construction of the concrete retaining wall 4 Can be reduced.

  Even when the method of the present modification is adopted, if the ground constituting the slope 2a of the natural ground 2 is relatively soft, the rod-shaped protrusion 110b can be directly driven into the slope 2a. Thereby, the driving operation can be performed more easily.

  Next, a second modification of the above embodiment will be described.

  FIG. 12 is a view similar to FIG. 3 showing a concrete retaining wall construction method according to this modification.

  As shown in the figure, in this modification, before the mortar 6 is sprayed on the slope 2a, a lath wire mesh 40 is attached to the slope 2a, and each separator connecting jig 10 is temporarily fixed to the slope 2a. Instead of attaching the separator connecting jig 10 to the rod-like member 12 driven into the slope 2a as in the above embodiment, the flange portion 210a of the separator connecting jig 210 is locked to the lath metal mesh 40. To do it.

  For this reason, in this modification, as in the case of the above-described embodiment, the separator coupling jig 210 is such that a nut 210B is welded to the tip of the jig body 210A. The tab portion 10b as in the case of the jig body 10A in the separator coupling jig 10 of the above embodiment is not formed on the jig body 210A, and the configuration is simplified accordingly.

  By adopting the method of this modification, a reaction force to counter the tension acting on the separator 20 can be secured not only by the separator connecting jig 210 and the mortar 6 but also by the lath metal mesh 40. The construction reliability can be further improved. Further, the temporary fixing of the separator connecting jig 210 to the slope 2a is performed by locking the flange portion 210a of the separator connecting jig 210 to the lath metal mesh 40. It is possible to eliminate the need for driving the rod-like member 12 into the slope 2a as in the case, thereby further improving the construction efficiency.

  In this modification, the jig main body 210A may be appropriately wound around the lath metal mesh 40 using a binding steel wire or the like in order to more reliably position the separator coupling jig 210.

  Further, as in the present modified example, not only each separator coupling jig 210 is locked to the lath metal mesh 40, but also each separator coupling jig 210 is driven into the slope 2a as in the above embodiment. It is also possible to attach to the rod-shaped member 12 which has been made, and by doing so, the reliability of construction can be further enhanced.

Side sectional view of a construction site showing a concrete retaining wall construction method according to an embodiment of the present invention Detailed view of part II in Fig. 1 Detailed cross-sectional view taken along line III-III in FIG. Process diagram of the concrete retaining wall construction method (Part 1) Process diagram of the concrete retaining wall construction method (Part 2) Process diagram of the concrete retaining wall construction method (Part 3) Process diagram of the concrete retaining wall construction method (Part 4) Process diagram of the concrete retaining wall construction method (Part 5) Process drawing of the concrete retaining wall construction method (Part 6) The concrete retaining wall construction method process diagram (Part 7) The same figure as FIG. 5 which shows the 1st modification of the said embodiment. The same figure as FIG. 3 which shows the 2nd modification of the said embodiment.

Explanation of symbols

2 Natural ground 2a Slope 2b Drill hole 4 Concrete retaining wall 6 Mortar 10, 110, 210 Separator connecting jig 10A, 210A Jig body 10B, 210B Nut 10a, 110a, 210a Flange part 10b Tab part 12 Bar-shaped member 20 Separator 22 Barrage 22a Small hole 24 Plastic cone 24a Female thread part 24b Male thread part 26 Vertical beam square pipe 28 Foam tie 30 Horizontal beam round pipe 32 Clamp 40 Lath wire mesh 110b Bar-shaped protrusion 110c Screw hole

Claims (7)

In the concrete retaining wall construction method of constructing the concrete retaining wall covering the slope,
A plurality of separator coupling jigs having flange portions formed at the base end are temporarily fixed to the slope in a state of being arranged at predetermined intervals along the slope, and then mortar is sprayed on the slope. By fixing the base end portion of each separator connecting jig to the slope,
Thereafter, the base end of the separator is connected to the tip of each separator connecting jig, and a dam plate is installed at the tip of each separator so as to be substantially parallel to the slope, A concrete retaining wall construction method characterized by placing concrete between the slopes.   The temporary fixing of each separator coupling jig to the slope is performed by driving a rod-shaped member into the slope in advance and attaching the separator coupling jig to the rod-shaped member. The concrete retaining wall construction method according to claim 1.   Temporarily fixing each separator coupling jig to the slope is performed by previously providing each separator coupling jig with a rod-shaped protrusion and driving the rod-shaped protrusion into the slope. The concrete retaining wall construction method according to claim 1, wherein the concrete retaining wall is constructed.   The method for constructing a concrete retaining wall according to any one of claims 1 to 3, wherein a lath wire mesh is attached to the slope before the mortar is sprayed on the slope.   5. The concrete support according to claim 4, wherein the separator fixing jig is temporarily fixed to the slope by engaging a flange portion of the separator connecting jig with the lath metal mesh. Wall construction method. While forming a screw hole at the tip of each separator coupling jig, and forming a screw part at the base end of each separator,
The concrete retaining wall construction according to any one of claims 1 to 5, wherein the separator is connected to the separator connecting jig by screwing the separator to the separator connecting jig. Method.   The concrete retaining wall construction method according to any one of claims 1 to 6, wherein each of the separator connecting jigs is manufactured by bending a metal plate.

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