JP6315924B2 - Buttress construction method - Google Patents

Description

  The present invention relates to a method for constructing a foundation such as a large-scale building using a discard frame, and more particularly, to a buttress construction method.

The construction of the portion which becomes a buttress (buttresses) the basis for the construction thereof, and grooving roots kerf including a step portion for forming the buttress, demolding after Da設concrete by installing formwork wooden However, the method of backfilling the soil in the vacant space below the buttress is generally used.

For example, as shown in FIG. 10, in the conventional construction method, and grooving roots kerf 10 corresponding to the base 1 and the buttress 2, by installing formwork placed reinforcing bars 40, Da設concrete 50 After that, the mold was removed, and the soil 30 was backfilled in the vacant space below the buttress 2. In this case, when the soil 30 is backfilled, the lower portion of the buttress 2 cannot be completely filled with the soil 30, and a cavity H is formed.

  Further, for example, Patent Document 1 proposes a method for constructing a retaining wall having a buttress and a weight-shaped foundation. In the construction method of Patent Document 1, the upper end surface of the buttress extends horizontally toward the high ground G, and the lower end surface of the buttress is formed to extend obliquely upward from the column base portion of the column toward the high ground G. The In the construction of the retaining wall, first, excavate the high ground G to the minimum extent necessary for constructing the pile, foundation and buttress, arrange reinforcing bars in the pile hole of the pile, and put concrete in the pile hole. Cast in and cast in place concrete piles. The column and buttress main bars are at least partially constructed at the same time as the pile arrangement, and the main bars settle in the concrete of the main pile. Next, the foundation is laid and the concrete is placed to construct the foundation. After that, pillars, walls, buttresses, foundation reinforcement and concrete placement are performed. After the concrete and mortar of each part is hardened, the excavated soil is backfilled and the construction of the retaining wall is completed. Also in this case, the lower part of the buttress cannot be completely filled with soil, and a cavity is formed.

JP 2011-17184 A

  As described above, according to the conventional buttress construction method, after placing concrete, and after demolding the formwork, it is required to backfill the soil from both sides in the vacant space below the buttress, The filling and backfilling of the soil is very difficult, and there is a problem that the cavity H is inevitably formed. In addition, the conventional buttress construction method has not been able to pre-fill the soil below the buttress before placing the concrete.

  In addition, the conventional buttress construction method requires demolding after placing the formwork and placing the concrete, which takes time, and after placing the concrete, the concrete hardens and increases its strength. There is also a problem that the construction period becomes long because the mold cannot be removed.

  Accordingly, an object of the present invention is to provide a method for constructing a buttress capable of easily filling and backfilling the soil below the inclined surface of the buttress.

  Another object of the present invention is to provide a buttress construction method that does not require demolding of the formwork and can shorten the construction period.

According to the present invention, grooving roots kerf including a step portion for forming the buttress, as buttress mold frame as a killing filling is positioned at the stepped portion, the捨型frame comprising buttress for formwork Kenkomi to drilling groove roots cut in the groove, after backfilling the soil and the step portion which is positioned around the buttress for the formwork of捨型frame that crowded Ken, made Haisuji to it crowded Ken捨型frame A method of constructing a buttress for placing concrete is provided.

  When backfilling the outside of the formwork frame prior to concrete placement, the stepped part corresponding to the bottom of the buttress is also backfilled, so it is easy to fill and backfill the soil below the buttress slope. In addition, by using the discard frame, it is not necessary to remove the mold at the lower part of the buttress, and the construction period can be shortened.

A pair of buttress molds are disposed between a pair of buttress side molds facing the side walls of the root cut grooves and a pair of buttress side molds, and are inclined with respect to the bottom face of the root cut grooves. It has a buttress bottom plate which is secured to the buttress side mold, at least partially dug in disconnected Kenkomi the groove roots cut groove, surrounding the buttress bottom plate of捨型frame forme construction of the buttress bottom plate It is preferable that after the soil is backfilled to the stepped portion corresponding to at least a part of the removed state, at least a part of the removed state of the buttress bottom plate is fixed to the pair of buttress side molds. Thereby, the soil can be backfilled more easily from the place where the buttress bottom plate is removed.

After backfilling Kenkomi, the soil and the step portion corresponding to the entire circumference and buttress bottom plate of捨型frame forme denominated the捨型frame to buttress the bottom plate throughout the drilling in disconnected groove roots kerf, buttress The entire bottom plate is preferably fixed to a pair of buttress side molds. As a result, the soil can be backfilled in the stepped portion corresponding to the entire buttress bottom plate in a state in which the discard frame is built.

Buttress bottom plate are dividable configured into a plurality of regions, at least one divided Kenkomi in roots kerf was grooving when opening the region, denominated elaborate捨型frame around the buttress buttress bottom plate After the soil is backfilled to the step portion corresponding to the at least one divided region with the bottom plate removed, the at least one divided region to which the buttress bottom plate is not fixed is formed into a pair of buttress side molds. It is preferable to fix. Thereby, the soil can be backfilled in the stepped portion from a part of the buttress bottom plate divided into a plurality of regions.

A buttress mold is disposed between the pair of buttress side molds facing the side walls of the root cut groove and the pair of buttress side molds, and is inclined with respect to the bottom face of the root cut groove. said pair of has a buttress bottom plate which is secured to the buttress side mold, Kenkomu to the buttress bottom plate the drilling groove roots cut groove in a state of being fixed to the buttress side mold of the pair It is preferable.

  A pair of receiving angles each fixed to a pair of buttress side molds in a state of being inclined with respect to the bottom surface of the root cut groove, and the buttress bottom plate is supported by the pair of receiving angles; Is preferred. As a result, the buttress bottom plate can be easily attached.

  According to the present invention, when the outside of the scraping frame is backfilled prior to the concrete placement, the stepped portion corresponding to the lower portion of the buttress is also backfilled. Filling and backfilling can be facilitated, and by using the discard frame, it is not necessary to remove the mold at the lower part of the buttress, and the construction period can be shortened.

It is sectional drawing of the completion state which shows the Example of the construction method of the buttress of this invention. It is a perspective view which shows roughly the structure of the discard frame used for the construction method of the buttress of this invention. The construction stage of grooving roots kerf construction method of buttress of the present invention is a cross-sectional view illustrating. The construction stage of writing denominated in Excavation within grooves which grooving the捨型frame construction method of the buttress of the present invention is a cross-sectional view illustrating. It is sectional drawing which shows the construction step which refills the soil of the construction method of the buttress of this invention. It is sectional drawing of the AA line in FIG. It is sectional drawing which shows the construction step which attaches the buttress bottom board of the construction method of the buttress of this invention. It is sectional drawing which shows the construction step which arranges the bar arrangement in the discard frame of the construction method of the buttress of this invention. It is sectional drawing which shows the other Example of the construction method of the buttress of this invention. It is sectional drawing of the state which backfilled the soil in the lower part of the buttress which shows the construction example of the conventional buttress.

  FIG. 1 is a sectional view of a completed state showing an embodiment of the buttress construction method of the present invention. FIG. 2 shows the configuration of the buttress portion discarding frame 20 used in the present embodiment. FIG. 2A shows a state in which the buttress bottom plate 23 is removed, and FIG. 2B shows that the buttress bottom plate 23 is attached. It is in the state. Moreover, FIGS. 3-8 has shown the main construction steps.

  As shown in FIG. 1, in the buttress construction method of the present invention, a discard frame 20 is used when the foundation 1 having the buttress 2 is constructed. As a result, prior backfilling is performed, the concrete 50 is placed, the buttress 2 is formed, and then the discard frame 20 is embedded in the root cut groove 10 without being removed.

  As shown in FIG. 2, the discard frame 20 that forms the foundation 1 including the buttress 2 includes a buttress side frame 21, a bottom frame 22, a buttress bottom plate 23, an end frame 24, and a steel plate. A buttress formwork is provided.

  The buttress mold for forming the buttress 2 is disposed between the pair of buttress side molds 21 facing the side walls of the root cut groove 10 and the pair of buttress side molds 21. And a buttress bottom plate 23 fixed to a pair of buttress side molds 21 in an inclined state with respect to the bottom surface. The buttress side frame 21 is provided with a receiving angle 23a for mounting the buttress bottom plate 23 at a location where the buttress 2 is formed. In this example, the buttress bottom plate 23 is divided into two pieces. The bottom frame 22 is a horizontal portion bottom plate connected to the upper end of the buttress bottom plate 23.

Construction method of buttress of the present invention, first, the grooving roots kerf 10 to ground. As shown in FIG. 3, the root cut groove 10 includes a relatively shallow underground beam portion 10a for forming an underground beam, a relatively deep, for example, independent foundation portion 10b, an underground beam portion 10a, and an independent foundation portion. 10b and a step portion 10c in which the buttress 2 is formed.

Next, the construction writing process捨型frame 20 digging trenches roots kerf 10. In this process, the buttress side frame 21, the bottom frame 22, and the end frame 24 are assembled and dropped from above the root cut groove 10 without the buttress bottom plate 23 attached, and the underground beam of the root cut groove 10 is inserted. It installs in the part 10a and the level | step difference part 10c (refer FIG. 4). Also in the independent base part 10b, a disposal frame is built by a well-known method.

Then, drilling backfilled soil 30 that grooves (prior backfilling) performing step. In the preceding backfilling step, the soil 30 is backfilled outside the formwork of the underground beam portion 10a and the independent foundation portion 10b, and the soil 30 is also placed outside the buttress side frame 21 at the stepped portion 10c. Is backfilled (see FIG. 6). Further, the soil 30 is backfilled and filled in the lower portion of the buttress 2 through the opening where the buttress bottom plate 23 is not mounted (see FIG. 5).

  Next, a process of attaching the buttress bottom plate 23 is performed. In this attachment process, the buttress bottom plate 23 is mounted on the angle 23a and fixed by welding or bolting (see FIG. 7).

  Next, the step of arranging the reinforcing bars 40 in the discarding frame 20 is performed. In this bar arrangement process, the reinforcing bars 40 are arranged in the discarding frame 20 (see FIG. 8). The reinforcing bars 40 may be assembled inside the discarding frame 20, but it is more desirable to suspend the lattice-shaped reinforcing bars 40 assembled outside and install them inside the discarding frame 20.

  Next, a step of placing the concrete 50 in the discard frame 20 is performed. In this step, the foundation of the structure is constructed by placing concrete 50 in the discard frame 20 in which the reinforcing bars 40 are installed (see FIG. 1).

As described above, in this embodiment, the root includes the underground beam portion 10a, the independent foundation portion 10b, and the step portion 10c that connects the underground beam portion 10a and the independent foundation portion 10b and should form the buttress 2. and grooving the kerfs 10, as buttress for formwork is positioned in the stepped portion 10c, Kenkomi the捨型frame 20 as a killing filling comprises the buttress for formwork in drilling groove roots kerf 10, After the soil 30 is backfilled in the periphery of the built-up discard frame 20 and the stepped portion 10c where the buttress mold is located, the reinforcement 50 is placed in the discard frame 20 and the concrete 50 is placed.

  Filling the lower part of the inclined surface of the buttress 2 with the soil 30 by filling the soil 30 back to the lower part of the inclined surface of the buttress mold before placing the concrete 50 using the scraping frame 20 to be buried. Backfilling can be performed easily, and cavities are not formed. Moreover, there is no demolding of the mold used in the conventional construction method, and the construction period can be shortened.

A buttress mold, which is a discarded mold, is arranged between a pair of buttress side molds 21 facing the side walls of the root cut groove 10 and a pair of buttress side molds 21. has a buttress bottom plate 23 which is fixed to the buttress side mold 21 of a pair in an inclined against, Kenkomi the root kerf 10 which grooving in when opening the buttress bottom plate 23, Kenkon After the earth 30 is backfilled in the periphery of the scraped mold frame 20 and the stepped portion 10c corresponding to the buttress bottom plate 23, the buttress bottom plate 23 is fixed to the pair of buttress side surface mold frames 21, thereby removing the buttress bottom plate 23 from the outside. The soil 30 can be backfilled from where it was done.

  It further includes a pair of receiving angles 23a fixed to a pair of buttress side molds 21 in a state inclined with respect to the bottom surface of the root cut groove 10, and the buttress bottom plate 23 is formed by the pair of receiving angles 23a. By being supported, the buttress bottom plate 23 can be easily mounted and fixed.

FIG. 9 shows another embodiment of the buttress construction method of the present invention. In this case, so that the writing denominated root kerf 10 was grooving when opening the one upper end of the two buttress bottom plate 23.

As shown in FIG. 9, in the construction writing process捨型frame 20 digging trenches roots kerf 10, the one of the two buttress bottom plate 23 in a state of being fixed to the angle 23a, the捨型frame 20 It is built in the root cut groove 10. In the step of backfilling the soil outside the discard mold frame 20, the soil 30 is backfilled on the stepped portion 10c from the remaining opening. Thus, after filling the step 30 c corresponding to the lower part of the buttress 2 with the soil 30, another buttress bottom plate 23 is mounted and fixed by a method such as welding.

  The buttress construction method shown in FIG. 9 has the same effect as the method of backfilling the soil 30 into the stepped portion 10c corresponding to the lower portion of the buttress 2 from the opening where the two buttress bottom plates 23 are not mounted. .

Thus, the buttress bottom plate 23 is dividable structure into a plurality of regions, but crowded Kenkomi, denominated in the grooving when opening the at least one divided region of the buttress bottom plate 23 roots kerf 10 At least one division in which the buttress bottom plate 23 is not fixed after the earth 30 is backfilled to the stepped portion 10c corresponding to at least one divided region in the state where the buttress bottom plate 23 is removed from the periphery of the scraping frame 20 By fixing the formed area to the pair of buttress side molds 21, the soil 30 can be easily backfilled from the part of the buttress bottom plate 23 divided into a plurality of areas into the stepped portion 10 c.

  In the above-described embodiment, the example in which the buttress bottom plate 23 is configured by two plates has been described, but the present invention is not limited to this. For example, you may make it comprise from the board of 1 sheet or 3 sheets or more according to the magnitude | size of a buttress.

Also, if the buttress bottom plate 23 which is composed of one plate, Kenkomi the buttress bottom plate 23 drilling when opening the entire inside roots kerf 10 as grooves, around the buttress bottom plate of捨型frame 20 forme Ken After the soil is backfilled to the stepped portion 10c with the 23 removed, the buttress bottom plate 23 is fixed to the pair of buttress side molds 21.

Further, in the above-described embodiment, Kenkomi the drilling groove roots kerf 10 when opening the part or all of the buttress bottom plate 23, an example has been described backfilling with soil 30, the present invention is to It is not limited. For example, the buttress bottom plate 23 may be built in the root cutting groove in a state of being fixed to the pair of buttress side molds 21. In this case, the soil 30 can be backfilled before the concrete is placed by backfilling the soil 30 onto the stepped portion 10c from the opening on the side surface of the buttress mold. The same effect as the method of refilling the soil 30 from the opening where the 23 is not mounted is obtained.

  All the embodiments described above are illustrative of the present invention and are not intended to be limiting, and the present invention can be implemented in other various modifications and changes. Therefore, the scope of the present invention is defined only by the claims and their equivalents.

DESCRIPTION OF SYMBOLS 10 Root cut groove 10a Underground beam part 10b Independent foundation part 10c Step part 20 Discarding frame 21 Buttress side frame 22 Bottom frame 23 Buttress bottom plate 23a Receiving angle 24 End frame 30 Earth 40 Reinforcement 50 Concrete H Cavity

Claims (4)

And grooving roots kerf including a step portion for forming the buttress, as buttress mold frame comprising a killing filling is positioned at the step portion and the digging grooves捨型frame including the buttress for formwork After burying in the root cutting groove, backfilling the soil around the built-up discard frame and the stepped portion where the buttress mold frame is located, reinforcing bars are placed in the built-up discard frame. It is a construction method of buttress to go and place concrete ,
The buttress mold is disposed between a pair of buttress side molds facing the side wall of the root cut groove and the pair of buttress side molds, and is inclined with respect to the bottom face of the root cut groove And a pair of buttress bottom plates fixed to the pair of buttress side molds, and at least a part of the buttress bottom plate is removed and built in the root cut groove, and the built-in The back surface of the pair of buttress side surfaces is removed from at least a part of the buttress bottom plate after the soil has been refilled in the stepped portion corresponding to at least a part of the removed frame and the buttress bottom plate removed. A buttress construction method characterized by being fixed to a formwork . After backfilling Kenkomi, the soil and the step portion corresponding to the entire buttress bottom plate and surrounding elaborate捨型frame該建the drilling groove roots cut groove when opening the entire buttress bottom plate, The buttress construction method according to claim 1 , wherein the entire buttress bottom plate is fixed to the pair of buttress side molds. Wherein and buttress bottom plate is dividable structure into a plurality of regions, the buttress bottom plate of at least one of the divided said when opening the area dug Kenkomi the groove roots cut groove,捨型frame forme該建And then backfilling the stepped portion corresponding to at least one divided region in a state where the buttress bottom plate is removed, and then at least one non-fixed region of the buttress bottom plate is fixed. The buttress construction method according to claim 1 , wherein the buttress construction method is fixed to the pair of buttress side molds. A pair of receiving angles fixed to the pair of buttress side molds in a state of being inclined with respect to the bottom surface of the root cut groove, and the buttress bottom plate is supported by the pair of receiving angles. The buttress construction method according to any one of claims 1 to 3 , wherein the construction method is a buttress.

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