JPWO2011036991A1 - Backfill structure and backfill method - Google Patents

Abstract

[Purpose] The purpose is to realize a backfill structure suitable for relatively small-scale land improvement without problems such as unstable retaining walls after construction. [Configuration] A backfill structure for constructing an underground structure, which includes a plurality of wall panels 1 standing on the front surface of a natural ground and through a through hole provided in the wall panel. A connecting member 2 that is tightened on the front surface side, a mesh sheet 3 that is fastened to the other end of the connecting member 2, and a backfill soil main body that is placed on the mesh sheet 3 and embeds and fixes the mesh sheet 3. In addition, the wall panel 1, the back surface side of the wall panel, and the natural mountain portion are backfilled and filled with a soil body. [Selection] Figure 1

Description

  The present invention relates to a backfilling structure and a backfilling method for preventing the surrounding ground from collapsing when constructing a foundation part of a building or an underground structure.

  When building an underground structure such as a building foundation or basement, first excavate the surrounding ground to secure the necessary width, and install a retaining wall or foundation on one side of the slope, and drill on the back side. It is a common construction method to construct a backfill structure that serves as a retaining wall by backfilling the soil.

The structure and construction method of this conventional backfill structure will be described with reference to FIGS.
FIG. 10 is a plan view showing a configuration of a conventional backfill structure, and FIG. 11 is a cross-sectional view taken along line BB of FIG.
As shown in FIGS. 10 and 11, in the conventional backfill structure, a wall surface panel 101 is erected on the boundary surface of the backfill portion 6 via a runner 7, and the wall panel 101 is opposite to the natural mountain side ( Hereinafter, the wire 103 for holding stretched from a horizontal bar 102 fixed to the wall panel 101 to a through hole (not shown) provided in the wall panel 101 is grounded. It is fastened to a support pile 104 such as an anchor driven into the mountain portion 5 to support the earth pressure applied to the wall surface panel 101 in balance with the pulling resistance force of the support pile 104.
The pulling direction of the recording wire 103 is not necessarily limited to one direction, and the pulling wire 103 can be pulled in a plurality of directions if necessary in a direction in which the balance as a whole can be easily balanced.

FIG. 12 is a diagram showing a construction process of this conventional backfill structure.
At the time of construction, first, as shown in FIG. 12A, a wall panel 101 is erected on a backfill portion 6 formed by excavation through a runner 7. From the horizontal bar 102 fixedly provided on the front surface side of the wall surface panel 101, the wire 103 for holding is stretched through a through hole provided in the wall surface panel 101. Then, the support pile 104 is driven into the natural ground portion 5, and the recording wire 103 is fastened to the support pile 104. And backfill soil is carried in and backfilled to such an extent that the wire 103 for support and the support pile 104 are filled. At this time, the compaction work is performed on the backfilling soil to compact the backfilling soil.

  Then, as shown in FIGS. 12B and 12C, this operation is repeated from the bottom to the top of the wall surface panel 101, and backfilling is performed to the same extent as the height of the wall surface panel 101. Build things. The backfill structure thus constructed supports and stabilizes the wall surface panel 101 by the balance between the earth pressure of the backfill portion 6 and the pulling resistance force of the support pile 104.

  By the way, the optimal construction method for placing the support pile 104 in such a case differs according to the soil condition of the ground and the ground and the conditions of the construction environment. For this reason, it is not always possible to obtain a stable pull-out resistance, and the number of support piles 104, construction position, thickness of rebars and number of twists must be changed according to the construction environment. In the return soil part, there is a problem that after construction, the construction position of the support pile is likely to shift due to the fluctuation of natural ground or the influence of rainwater, and the pulling resistance as intended cannot be obtained.

  Moreover, by performing compaction by a rolling operation, the voids in the backfilling portion 6 can be eliminated, and the backfilling portion 6 can be in a denser state. However, due to this work, the wire 103 for reserving is pulled in the direction of the wall panel 101 or the natural ground 5 in the backfill portion 6. Therefore, since the wall panel 101 is tilted or the holding wire 103 is pulled, the support pile 104 may be pulled out from the natural mountain part 5, so that sufficient rolling work cannot be performed. Therefore, it becomes a fragile backfill structure that is easily affected by fluctuations in the surrounding ground and rainwater.

  In order to solve such problems, a frame is installed on the slope of the embankment, a vegetation soil member and an embankment body are provided on the inside of the embankment, and the embedding body is embedded and fixed at the bottom of the framework. A light-weight embankment structure provided with a structure has been reported (see Patent Document 1).

JP 2002-371559 A

As described above, the conventional backfilling method using support piles and anchors may not provide the intended pulling resistance, and the retaining wall is stable, such as being pushed down by the side pressure of the backfilling soil. If you don't, you will be born.
In addition, the invention described in Patent Document 1 requires the preparation of a large steel frame and is effective for large-scale construction, but is not intended to improve the ground of a general building site.

  The present invention solves such problems and realizes a backfill structure and a backfill method suitable for relatively small land improvement without problems such as unstable retaining walls after construction. Let it be an issue.

  In order to solve the above problems, the backfill structure of the present invention is a backfill structure for constructing an underground structure by backfilling excavated soil, A plurality of wall panels erected at a predetermined interval, a plurality of sheet members attached along the height direction of the plurality of wall panels, the plurality of sheet members and the plurality of wall panels. And connecting the plurality of sheet members connected to the plurality of wall surface panels to be substantially parallel to the ground. It is characterized by being buried.

  Moreover, the backfill structure of the present invention is characterized in that the plurality of sheet members are net-like.

  The backfill structure of the present invention is characterized in that the plurality of sheet members are made of steel, cloth, or resin.

  In the backfill structure according to the present invention, the length of the plurality of sheet members is approximately 1/3 or more of the length of the wall surface panel 1 in the height direction.

  The backfilling method of the present invention is a backfilling method for constructing an underground structure by backfilling excavated soil, and includes an excavation process for excavating the ground to be backfilled, A panel standing step for standing a wall panel on the front surface, a step for attaching a plurality of sheet members to the wall panel, and a backfill portion between the ground and the wall panel up to the laying level of the plurality of sheet members A backfilling step for backfilling, and a leveling step for leveling after refilling repeatedly for the number of sheets of the plurality of sheet members.

  Furthermore, the backfilling method of the present invention is a backfilling method for constructing an underground structure by backfilling excavated soil, and includes a drilling step of excavating the ground to be backfilled, A panel standing step for standing a wall panel on the front surface, a step for attaching a plurality of sheet members to the wall panel, and a backfill portion between the ground and the wall panel up to the laying level of the plurality of sheet members The backfilling step, the rolling step for rolling the laying level surface after backfilling to the laying level of the plurality of sheet members, the backfilling step, and the rolling step include the number of sheet members. And a leveling step in which leveling is performed after repeating the minute.

  Since the present invention is constructed and processed as described above, it is suitable for construction on a small-scale land, can be constructed according to the local situation, and a wall panel that forms a retaining wall is formed over a long period after construction. A backfill structure and a backfill method that can be stably maintained can be realized.

It is a top view which shows the structure of one Embodiment of the backfill structure of this invention. It is AA sectional drawing of embodiment shown in FIG. It is detail drawing of the connection member used for embodiment shown in FIG. It is a flowchart figure of the backfilling construction method of this invention. It is sectional drawing of the backfill structure which concerns on 2nd Embodiment. It is detail drawing of the connection member used in 2nd Embodiment. It is the flowchart which showed the construction procedure of the backfill structure of 2nd Embodiment. It is the figure which showed the construction process of the backfill structure of 2nd Embodiment. It is the figure which showed the construction process of the backfill structure of 2nd Embodiment. It is a top view which shows the structure of the conventional backfill structure. It is BB sectional drawing of FIG. It is the figure which showed the construction process of the conventional backfill structure.

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

<First Embodiment>
1-3 is a figure which shows the backfill structure which concerns on 1st Embodiment.
1 to 3, reference numeral 1 is a wall panel, reference numeral 2 is a connecting member, reference numeral 3 is a net sheet, reference numeral 4 is a backfill body, reference numeral 5 is a ground portion, reference numeral 6 is a backfill section, reference numeral Reference numeral 21 denotes a type 3 washer, reference numeral 22 denotes a slab ring, reference numeral 23 denotes a nut, reference numeral 24 denotes a horizontal bar, and reference numeral 31 denotes a holding wire. Hereinafter, it demonstrates in detail along FIGS. 1-3.

FIG. 1 is a plan view of a backfill structure according to the first embodiment.
As shown in the figure, a plurality of wall panels 1 are erected on the front surface of the natural ground portion 5 at a predetermined interval with respect to the slope of the natural ground portion 5, and the front edge of the backfill structure Consists of a partition. And the net-like sheet | seat 3 is embed | buried between the front surface of this natural ground part 5, and the several wall surface panel 1. FIG. The mesh sheet 3 is fastened to the connecting member 2 via a wire 31 for holding. One end of the connecting member 2 is penetrated through a through hole (not shown) provided in the wall surface panel 1, and a wire 31 for holding is connected to one end side thereof.

FIG. 2 is a cross-sectional view taken along the line AA of FIG.
As shown in the figure, the wall surface panel 1 is erected on a runner 7 that is previously installed on the excavation surface. In order to maintain the stability of the wall surface panel 1, a net-like sheet 3 is laid to cover the ground portion at the lowest part of the wall surface panel 1 and is directly fixed to the wall surface panel 1 with screws 8 or the like.
The reticulated sheets 3 are fastened to the connecting member 2 via a wire 31 for recording at a plurality of portions in the height direction of the wall surface panel 1 other than the lowest part. The net-like sheet 3 is embedded in the backfilling section 6 approximately parallel to the ground by backfilling soil 4. In the figure, three net-like sheets 3 embedded in a plurality of layers are disposed along the height direction so as to be substantially parallel to the ground.

By adopting such a configuration, the earth pressure of the backfill soil 4 is applied to each of the mesh sheets 3. By this earth pressure, the reticulated sheet 3 can sufficiently anchor the ground part 5 by the backfill part 6 without hitting the support pile as in the prior art, and balances the earth pressure applied to the wall panel 1. The wall surface panel 1 can be supported.
As the wall panel 1 used here, for example, a steel formwork “E-PANET” (registered trademark) subjected to high corrosion resistance plating can be used, and the mesh sheet 3 is made of steel or resin. Things can be used.

FIG. 3 is a diagram showing details of the connecting member 2 used in the first embodiment.
As shown in the figure, the connecting member 2 is constituted by a combination of a type 3 washer 21, a slab ring 22 and a nut 23. When in use, the slab ring 22 is passed through the through hole provided in the wall surface panel 1 from the natural mountain part 5 side, passed through the 3-type washer 21 on the front side of the wall surface panel 1, and fastened with the nut 23. Then, a horizontal bar 24 (here, using a 10 mmφ rebar) is held in a gap formed between the curved surface of the metal fitting of the type 3 washer 21 and the front surface side of the wall panel 1 and fastened. By fastening the horizontal bar 24, the wall surface panel 1 is connected to the left and right wall surface panels, and the required strength can be obtained.
In order to fasten the mesh sheet 3 to the wall panel 1, the connecting member 2 is not necessarily used. For example, the mesh sheet 3 may be directly attached to the wall panel 1.

  In FIG. 1, the net-like sheet 3 is laid and laid substantially parallel to the ground from each of the three sets of wall-surface panels 1, but it is not always necessary to pull out the net-like sheets 3 from all the wall-surface panels 1. If the panels 1 are connected to each other, a part of the panels 1 may be omitted, or a part of the panels 1 may be replaced with fastening by a support pile shown in the conventional example.

FIG. 4 is a flowchart showing the backfilling method according to the first embodiment. The backfilling method in the first embodiment will be described with reference to this flowchart.
The backfilling method of the present invention is a backfilling method for constructing an underground structure on excavated ground.
First, the ground of a predetermined section is excavated (step S1: excavation process). Then, the wall surface panel 1 is erected at a predetermined position of the excavated excavation surface (step S2: panel erection process).
Next, the mesh sheet 3 is fastened and laid on the lowest part of the wall surface panel 1, and the backfill soil 4 is carried in and backfilled (step S3: backfilling step). Next, the mesh sheet 3 is laid on the height direction laying level surface of the wall surface panel 1 (step S4: laying step). Next, it is determined whether the mesh sheet 3 has been laid to a predetermined height with respect to the height direction of the wall surface panel 1 (step S5), and if the laying is less than the predetermined height, the backfilling step of step S3 And the laying process of step S4 is repeated.
After this repetition, the uppermost backfilling unit 6 is leveled (step S6: leveling step) to complete the backfilling.

  In this way, by backfilling, a plurality of layers of the backfilling soil 4 and the net-like sheet 3 are stacked on the backfilling portion 6 so as to be substantially parallel to the ground. In this way, the earth pressure of the backfill soil 4 is applied to each of the mesh sheets 3, and this earth pressure causes the mesh sheet 3 to backfill the ground portion 5 without hitting a support pile as in the prior art. The part 6 can be sufficiently anchored, and the wall panel 1 can be supported in balance with the earth pressure applied to the wall panel 1.

In addition, although the example of the steel form panel was shown above as the wall surface panel 1, it is not restricted to this, A resin or a wooden panel can be used.
As the material of the net-like sheet 3, a net-like sheet according to the material of the wall surface panel 1, such as steel, cloth, or resin, can be used. The net-like sheet 3 does not necessarily need to have a mesh if it is a sheet-like member that can receive earth pressure. Furthermore, according to the content rate of the clay and sand contained in soil, the above-described types of sheet-like members can be used properly.
Similarly, the interval between the plurality of mesh sheets 3 installed in the height direction of the wall surface panel 1 can be adjusted according to the scale of the structure to be constructed.
Furthermore, in order to maintain the stability of the wall surface panel 1 at the lowest part of the backfilling part 6, the mesh sheet 3 is installed. For example, when throwing concrete into the lowest part of the backfilling part 6 It is not necessary to install the mesh sheet 3.

<Second Embodiment>
5 and 6 are views showing a backfill structure according to the second embodiment of the present invention. In addition, since the same code | symbol was used for the structure same as 1st Embodiment, the overlapping description regarding the point is abbreviate | omitted.
In the backfill structure according to the second embodiment, the backfill structure optimal for the construction environment is constructed by changing the type and length of the mesh sheet drawn from the wall panel. .

FIG. 5 is a cross-sectional view of the backfill structure according to the second embodiment.
As shown in the figure, this backfill structure has a plurality of wall panels 1 standing on the front surface of the natural ground part 5 and constitutes a front edge section of the backfill structure. 1 is standing on a runner 7 installed on the excavation surface in advance, the net-like sheet 3 is pulled out from the wall panel 1 through the connecting member 20 in the direction of the backfill portion 5, and the net-like sheet 3 Is the same as in the first embodiment in that the backfilling unit 6 is buried by the backfilling soil 4 and a plurality of layers of the net-like sheets 3 are stacked in the backfilling unit 6.

It differs from 1st Embodiment in the connection method by the length of the net-like sheet | seat 3 pulled out from the wall surface panel 1, and a connection member.
As shown in FIG. 5, the length of the net-like sheet 3 that is pulled out is not pulled out to the slope as in the first embodiment, and is about 1/3 of the height of the wall panel 1 that stands upright. It has become the length. The length of the net-like sheet 3 can be adjusted because it varies depending on the soil quality of the surrounding ground, the soil quality of the backfill soil 4, and the scale of the structure to be constructed. If this length is less than 1/3, the force toward the front side of the wall surface panel 1 and the force toward the slope side cannot be balanced due to earth pressure, and the wall surface panel 1 cannot be supported. Accordingly, it is desirable that the length of the net-like sheet 3 drawn out is approximately 1/3 or more than the height of the wall surface panel 1.

FIG. 6 is a view showing the connecting member 20 used in the backfill structure according to the second embodiment.
As shown in the figure, unlike the first embodiment, the mesh sheet 3 is fixed to the wall panel 1 as it is via the connecting member 20. The connecting member 20 is a substantially U-shaped member that is long in the width direction of the wall surface panel 1. When fixing, one end of the mesh sheet 3 is sandwiched between the back surface of the connecting member 20 and the wall panel 1, and the mesh sheet 3 is fixed to the wall panel 1 using screws 8 in this state.
Thus, by using the connecting member 20 having a simple shape, the mesh sheet 3 can be easily fixed regardless of the material and shape of the wall surface panel 1.

FIG. 7 is a flowchart showing the construction procedure of the backfill structure according to the second embodiment, and FIGS. 8 and 9 are diagrams showing the construction process of the backfill structure. Hereinafter, with reference to FIGS. 7-9, the construction method of the backfill structure which concerns on 2nd Embodiment is demonstrated.
First, as shown to Fig.8 (a), in order to construct a backfill structure, the predetermined division of the natural ground part 5 is excavated (step S10 of FIG. 7). Next, as shown in FIG. 8 (b), a runner 7 is installed at a position where a width for forming the necessary backfill portion 6 is secured from the slope 8 formed by the excavation process. The wall panel 1 is erected (step S11 in FIG. 7). At this time, one end of the mesh sheet 3 is fixed and laid near the lowest part of the runner 7 or the wall surface panel 1. Note that it is not necessary to lay the mesh sheet 3 at the lowest part of the wall surface panel 1 depending on the construction environment when the wall surface panel 1 is erected in advance on the discarded concrete. Next, the backfill soil 4 is carried in and backfilled up to the laying level of the mesh sheet 3 on the wall surface panel 1 (step S12 in FIG. 7), and the connecting member 20 is placed at a predetermined position in the height direction of the wall surface panel 1 erected. The net-like sheet 3 is installed through (step S13 in FIG. 7).

  Next, the mesh sheet 3 is laid on the backfill soil 4 so as to be substantially parallel to the ground. Further, as shown in FIG. 9A, the backfill soil 4 is carried in to such an extent that the mesh sheet 3 is filled, and the backfill soil 4 is compacted by a rolling operation (step S14 in FIG. 7). Then, as shown in FIGS. 9 (b) and 9 (c), the backfilling soil 4 is repeatedly carried in and the rolling operation is repeated for the number of installed mesh sheets 3 (step S15 in FIG. 7), The uppermost backfilling unit 6 is leveled (step S16 in FIG. 7) to complete the backfilling.

  Since the backfill structure thus constructed performs rolling pressure on the backfill soil 4 at the position where the reticulated sheet 3 is laid, the backfill soil 4 is placed on the mesh portion of each reticulated sheet 3. The frictional resistance between the mesh sheet 3 and the backfilling soil is improved. As a result, the earth pressure and frictional resistance applied to the net-like sheet 3 and the backfilling soil exceed the earth pressure of the backfilling soil 4 applied to the wall surface panel 1, and as a result, the support of the wall surface panel 1 is strengthened. Can do.

In addition, the length of the mesh sheet pulled out from the wall panel and the installation interval can be changed according to the height of the wall panel, so it can be used in the length and number of sheets that match the construction environment and the scale of the structure. , Can reduce costs. Furthermore, since the connecting member has a simple shape and the net sheet can be reliably fixed to the wall panel easily, the construction can be performed without requiring a special technique. For this reason, the construction period can be shortened.
Needless to say, the rolling operation performed in the second embodiment may also be performed in the first embodiment.

  Since the present invention is suitable for construction on a small land, it can be constructed according to the local situation, and the wall panel forming the retaining wall can be stably maintained over a long period after construction. It can be widely used in the fields of architecture, civil engineering and related industries.

DESCRIPTION OF SYMBOLS 1 Wall panel 2, 20 Connecting member 3 Net-like sheet 4 Backfill soil 5 Ground mountain part 6 Backfill part 7 Runner 8 Screw 21 3 type washer 22 Slab ring 23 Nut 24 Horizontal bar 31 Retaining wire

Claims (6)

A backfill structure for building an underground structure by backfilling excavated soil,
A plurality of wall panels erected at predetermined intervals with respect to the slope of the natural mountain part;
A plurality of sheet members attached along the height direction of the plurality of wall surface panels;
A connecting member that connects the plurality of sheet members and the plurality of wall surface panels;
Have
The excavated soil is backfilled within the predetermined interval, and the plurality of sheet members connected to the plurality of wall surface panels are respectively laid and embedded so as to be substantially parallel to the ground. .   The backfill structure according to claim 1, wherein the plurality of sheet members have a net shape.   The backfill structure according to claim 1, wherein the plurality of sheet members are made of steel, cloth, or resin.   The backfilling according to any one of claims 1 to 3, wherein the plurality of sheet members have a length that is approximately 1/3 or more of the length of the wall surface panel 1 in the height direction. Structure. A backfilling method for building an underground structure by backfilling excavated soil,
An excavation process for excavating the ground to be backfilled;
A panel erecting process for erecting a wall panel on the front of the natural mountain part;
Attaching a plurality of sheet members to the wall panel;
A backfilling step of backfilling the backfilling part between the natural ground part and the wall panel to the laying level of the plurality of sheet members;
A leveling step of performing leveling after refilling repeatedly by the number of sheets of the plurality of sheet members;
A backfilling method characterized by comprising A backfilling method for building an underground structure by backfilling excavated soil,
An excavation process for excavating the ground to be backfilled;
A panel erection process for erecting a wall panel on the front of the natural mountain part
Attaching a plurality of sheet members to the wall panel;
A backfilling step of backfilling the backfilling part between the natural ground part and the wall panel to the laying level of the plurality of sheet members;
A rolling step of rolling the laying level surface after backfilling to the laying level of the plurality of sheet members;
A leveling step of leveling after repeating the backfilling step and the rolling step for the number of the sheet members;
A backfilling method characterized by comprising

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