JPH0548818B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a reinforced earth wall construction method for embankments.

[Conventional technology] When constructing roads or railways on flat or sloping ground, or when creating various embankments for industrial or residential land, it is necessary to stabilize the embankment, to meet site constraints, or to avoid In order to reduce construction costs, earth retaining walls made of concrete, etc. may be installed. The reinforced earth wall construction method for installing this earth retaining wall includes upper and lower panels 101, 102 as shown in Fig. 5.
Anchor plate 107 is attached to the end of tie rod 104 with compressible spacer 103 interposed therebetween.
are fixed to form the reinforcing material 110, and as the reinforcing material 110 moves downward in the figure due to the embankment, the panel 101, is compressed by the spacer 103.
102 also has a telescope system that can be relatively compressed and submerged. Alternatively, as shown in FIG.
5 constitutes a structure that can slide downward according to the displacement of the reinforcing material 110 by the embankment. Furthermore, as shown in FIG.
A vertically elongated through hole 106 is provided in the through hole 106, and the tie rod 104 is inserted into the through hole 106.
Tie rods 104 are fastened at the top of 06, and a through-hole method or the like is used to accommodate downward displacement of reinforcing material 110 by embankment.

[Problem to be solved by the invention] However, in each of the above-mentioned construction methods, the amount of consolidation settlement of the embankment varies depending on the soil quality, embankment height, construction method, etc., and it is not easy to predict accurately.
It is difficult to quantitatively understand its effects.
Furthermore, even if the reinforcing member (consisting of tie rods and anchor plates) is not sufficiently effective and excessive stress is applied to it, it is difficult to detect, and this becomes obvious only after an accident occurs in which the reinforcing member is damaged and the wall collapses.
In addition, in the telescope method (Fig. 5), it is necessary to increase the amount of compression of the wall body composed of the panels 101, 102, so the individual panels 101, 102 are
Since the reinforcing members 110 are formed small and a large number of spacers 103 are interposed, the number of reinforcing members 110 increases, resulting in relatively high material and construction costs. In addition, there is an economical problem because it is necessary to select a high quality embankment in order to reduce the amount of consolidation settlement of the embankment. Therefore, the present invention provides a reinforced earth wall construction method using L-shaped panels to eliminate such inconveniences.

[Means for Solving the Problems] The above problems are solved by a reinforced earth wall construction method using L-shaped panels that includes the following steps.

That is, in the reinforced earth wall construction method using L-shaped panels according to the present invention, a plurality of L-shaped panels each having a rectangular front shape and an L-shaped side surface are arranged in a predetermined position. connecting one end of a rod-shaped lower tie rod to an end of the bottom plate of each of the L-shaped panels arranged at a predetermined position, and attaching a flat anchor plate to the other end of the lower tie rod; After installing lower tie rods and anchor plates on the L-shaped panel, filling the inside of the L-shaped panel with earth, and with the earth being filled to a predetermined height inside the L-shaped panel, a step of connecting one end of a rod-shaped upper tie rod to the inner wall surface of the plate and attaching a flat plate-shaped anchor plate to the other end of the upper tie rod; and after attaching the upper tie rod and anchor plate to the L-shaped panel; a step of embanking soil up to the vicinity of the upper end surface of the L-shaped panel; and placing a new L-shaped panel on top of the soil that has been embanked up to the vicinity of the upper end surface of the L-shaped panel and at a position set back a predetermined distance from the inner surface of the L-shaped panel. and a step of erecting.

For this reason, an earth retaining wall of a desired height can be constructed by repeating the above steps.

[Effect]

According to the present invention, since the L-shaped panel is connected to the anchor plate through the upper tie rod and the lower tie rod, the L-shaped panel is prevented from collapsing due to earth pressure exerted by the anchor plate. Further, when the L-shaped panels are stacked, the upper L-shaped panel is placed at a position set back a predetermined distance from the inner surface of the lower L-shaped panel. For this reason, even if each L-shaped panel and tie rod etc. sink down into the embankment over time, the upper L-shaped panel will not come into contact with the lower L-shaped panel, and each L-shaped panel will stand alone. descend and sink. As a result, excessive stress is not applied to the upper tie rod, lower tie rod, or anchor plate, and the reinforced earth wall is prevented from collapsing due to damage to the anchor plate, tie rod, etc.

Further, one end of a lower tie rod is connected to the end of the bottom plate of the L-shaped panel, and a flat anchor plate is attached to the other end of the lower tie rod, and then embankment is carried out. That is, embankment is carried out with the bottom plate of the L-shaped panel supported by the lower tie rod and anchor plate. For this reason, there is no need to firmly fix the L-shaped panels to the ground before embanking.
As a result, even if the width of the bottom plate of the L-shaped panel is made as small as possible, there will be no inconvenience such as the L-shaped panel falling over during embankment.

[Example] This example will be described according to the drawings. FIG. 1 shows a block 18 consisting of the L-shaped panel 3, tie rod 4, and anchor plate 5 in this embodiment.
FIG. That is, the lower block 18 is composed of the L-shaped panel 3, the tie rod 4, and the anchor plate 5, and the upper block 18 is composed of the L-shaped panel 3, the tie rod 4, and the anchor plate 5.
Similarly, it is composed of an L-shaped panel 3, a tie rod 4, and an anchor plate 5. The L-shaped panel 3 is made of concrete and has a height H, a bottom plate width L, a width D, and a thickness U as is clear from FIG. 2, which will be described later. In addition, a tie rod (hereinafter referred to as a lower tie rod) 4 attached to the bottom plate of the L-shaped panel made of a steel round bar with a length l1 is a tie rod connecting fitting (hereinafter referred to as a lower connecting fitting) attached to the end of the bottom plate of the L-shaped panel 3. ) 8 is fixed vertically to the L-shaped panel 3 with bolts and nuts 20. Further, at the other end of the lower tie rod 4, a rectangular steel plate or concrete anchor plate 5 is fixed with nuts 10 in a direction parallel to the L-shaped panel 3. Furthermore, the same lower tie rod 4 is installed at a horizontal distance d from FIG. 2, which will be described later. Furthermore, a tie rod connecting fitting (hereinafter referred to as the upper connecting fitting) 8 is installed on the inner wall surface 21 of the L-shaped panel 3 at a height h from the lower tie rod 4.
is fixed to the upper connection fitting 8, and a tie rod (hereinafter referred to as the upper tie rod) 4, which is a round steel bar with a length l2, is bolted vertically to the L-shaped panel 3.
An anchor plate 5 is fixed to the other end of the upper tie rod 4 in a direction parallel to the L-shaped panel 3 with a nut 10. In addition, from Figure 2 described later, upper tie rod 4
is also attached at a horizontal distance d.

Next, a method for constructing a reinforced earth wall using this block 18 will be explained. FIG. 3 is a sectional view of the overall structure of this embodiment, in which a plurality of blocks 18
are being erected to construct reinforced earthen walls. Moreover, FIG. 2 is a view taken from arrow A to A in FIG. 3, in which a plurality of L-shaped panels 3 are arranged horizontally, and
A new L-shaped panel 3 is installed in contact with the inner wall surface 21 of
FIG. 3 is a plan view showing a state in which a plurality of wafers are arranged horizontally in an upright state. Further, as is clear from this figure, a pair of tie rods 4 are attached to the L-shaped panel 3 at the same height with a distance d between them. Therefore, first, as shown in FIGS. 2 and 3, a plurality of L-shaped panels 3 are placed horizontally on the foundation ground 1. Thereafter, as shown in FIG. 1, lower connecting fittings 8, 8 are attached to the lower tie rods 4, 4, and anchor plates 5, 5 are attached to the other ends of the tie rods 4, 4. Then, embankment 2 is placed between the inner wall surface 21 of the L-shaped panel 3 and the anchor plates 5, 5. After this embankment 2 reaches the height 2a shown by the dashed line in Fig. 1 from the foundation ground 1, attach the upper tie rods 4, 4 to the upper connection fittings 8, 8, and attach the other end of the upper tie rods 4, 4. Attach the anchor plates 5, 5 to the parts. Then, the embankment 2 is further laid, and when the height of the embankment 2 reaches the height 2b shown by the two-dot chain line in FIG.
When a new L-shaped panel 3 is erected on the embankment surface 2b near No. 1, bedding sand 9 is laid to ensure accurate erection, and the inner wall surface 21 of the lower L-shaped panel 3 and the new upper position are laid. A new L-shaped panel 3 is erected with a gap W between the L-shaped panel 3 and the outer wall surface 22. Next, tie rods 4, 4 and anchor plates 5, 5 are attached to the lower connecting fittings 8, 8 of the L-shaped panel 3, and then embankment is carried out as described above. These steps are repeated to construct a mud wall of a predetermined height. To explain the function based on the above structure, since the L-shaped panel 3 is connected to the anchor plate 5 via the tie rod 4, the collapse of the L-shaped panel 3 due to the earth pressure applied to the anchor plate 5 is prevented, and It becomes integrated with the embankment in the block 18. Therefore, even if each of the blocks 18 in the reinforced earth wall of this embodiment, which is made up of stacked blocks 18, sinks down, the reinforced earth wall will not collapse because each block 18 will sink down individually. That is, as shown in FIGS. 1 and 3, since the upper L-shaped panel 3 and the lower L-shaped panel are set back and erected, the sinking of the tie rod 4 due to the embankment 2 causes the connection fittings 8 to No excessive stress will occur. Therefore, the tie rod 4 can be prevented from separating from the L-shaped panel 3 and the L-shaped panel 3 can be prevented from collapsing without being subjected to the earth pressure of the anchor plate 5. Then, the reinforced area (reinforced earth wall block) indicated by the dashed-dotted line 11 shown in FIG. 3 is formed.

It goes without saying that the dimensions of the L-shaped panel, the length, diameter and number of tie rods, the size of the anchor plate, etc. are determined depending on the reinforcement range of the embankment, the properties of the embankment, etc.

Next, another embodiment is shown in FIG. As is clear from FIG. 4, this is a sectional view when a reinforced earthen wall is constructed in which the L-shaped panels 3 are set back a distance W from each other to form a horizontal flat step 25. The flat stepped portion 25 formed in this manner can be used as a passageway or can be used for planting trees, and the distance W can be arbitrarily selected depending on the purpose.

Note that even if the L-shaped panels 3 are moved back from each other by a distance of W to construct a reinforced earthen wall, the same operation and effect as in the above-mentioned embodiments can be achieved.

[Effects of the Invention] As detailed above, the present invention constructs a reinforced earth wall by receding and erecting L-shaped panels. Therefore, the blocks formed by each panel, tie rod, and anchor plate have a structure that allows them to sink independently of each other by the embankment.
Even if the tie rod sinks due to the embankment, the L-shaped panel to which the tie rod is fixed also sinks accordingly, so that excessive stress is not applied to the tie rod connecting fittings and the connecting fittings are not damaged. That is, the block consisting of the tie rod, anchor plate and L-shaped panel sinks as one. Therefore, according to the present invention, it is possible to construct a high earth retaining wall, and the construction work is easy, safe, and economically superior.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a block consisting of an L-shaped panel, tie rod and anchor plate;
Fig. 2 is a plan view when the blocks are arranged horizontally, Fig. 3 is a sectional view of the overall structure of the embodiment, and Fig. 4 is a sectional view of the overall structure of the embodiment.
The figure is a sectional view of the overall structure of another embodiment, Figures 5 to 7 are conventional examples, and Figure 5 is a telescope type,
FIG. 6 shows the slide type, and FIG. 7 shows the through-hole type. 1... Foundation ground, 2... Embankment, 3... L-shaped panel, 4... Tie rod, 5... Anchor plate, 8... Tie rod connection fittings.

Claims (1)

[Claims] 1. A step of arranging a plurality of L-shaped panels, each of which has a rectangular front shape and an L-shaped side surface, in a predetermined position; connecting one end of a rod-shaped lower tie rod to an end of the bottom plate of each of the L-shaped panels, and attaching a flat anchor plate to the other end of the lower tie rod; connecting the lower tie rod and the anchor to the L-shaped panel; After installing the plate, a step of embanking the inside of the L-shaped panel, and with the earth being embanked to a predetermined height inside the L-shaped panel, a bar-shaped upper tie rod is installed on the inner wall surface of the vertical plate of the L-shaped panel. Connecting one end and attaching a flat anchor plate to the other end of the upper tie rod; After attaching the upper tie rod and anchor plate to the L-shaped panel, embanking up to the vicinity of the upper end surface of the L-shaped panel. and a step of erecting a new L-shaped panel on the soil that has been filled up to the vicinity of the upper end surface of the L-shaped panel and at a position set back a predetermined distance from the inner surface of the L-shaped panel. This is a reinforced earth wall construction method using L-shaped panels.