JPH0381418A - Method for making steep slope of banking - Google Patents

Abstract

PURPOSE:To shorten the period of construction by fixing both end parts of reinforcing bars penetrating through the head part of a banking to a wale arranged on the slope, and fixing exposed end parts of anchor-reinforcing bars on the slope through bag-bodies packed with mortar. CONSTITUTION:Both end parts of respective reinforcing bars 1 nearly horizontally penetrating through the head part of a banking body are exposed from the banking body. Then, along the direction of extension of the banking body, a wale 2 is arranged on the upper end part of the slope on both sides of the banking, and respective end parts of the reinforcing bars 1 are fastened to the wale 2. Anchor-reinforcing bars 31 are then fixed on the slope beneath the wale 2 so that the bars are inclined downward. After plural drain materials 4 are arranged on the slope, bag-bodies 5 are installed over the drain materials 4, and the bag-bodies 5 are pierced with the exposed end parts 35 of the reinforcing bars 31. Further, after mortars 51 are injected into the bag-bodies 5, pressure bearing plates, nuts, etc. are mounted to the exposed end parts 35.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for steepening embankment slopes for railways, roads, etc.

<Conventional Technology> In recent years, efficient and advanced use of land has been required, especially in urban areas.

However, structures such as railways and roads are often in the form of embankments, even in urban areas, and occupy a large amount of land.

Therefore, the slope of the embankment is made steeper in order to make effective use of the resulting land.

Conventional steepening methods include excavating the slope of the embankment to a steeper slope and spraying or covering the slope with concrete after excavation, or covering the slope with concrete plates or steel sheet piles. is used.

<Problems to be Solved by the Present Invention> The conventional steepening method described above has the following problems.

(a) In the steep slope construction method, the work must be completed within a short period of time after railways, roads, etc. are closed and before they are restarted.

However, with the conventional spraying method using concrete, it takes time for the concrete to develop its strength, and the work may become impossible due to unforeseen accidents (spraying equipment malfunctions, etc.), which requires a lot of work time. Therefore, it is not suitable for use in steep slope construction methods.

<Exposure> Also, if sprayed concrete is used, it may float off the ground due to spring water, rainwater, etc., making it difficult to securely hold down the slope.

<C> The conventional method of covering slopes with concrete plates or steel sheet piles has poor workability and takes a lot of time because the concrete plates are heavy.

OBJECT OF THE INVENTION The present invention was made to solve the above-mentioned problems, and it is possible to easily steepen the embankment body in a short time, and to avoid the effects of spring water, rainwater, etc. The purpose of this invention is to provide a method for steepening embankment slopes that are less prone to damage.

<Configuration of the Present Invention> An embodiment of the present invention will be described below with reference to the drawings.

<B> Compaction of the head of the embankment body (Figure 1.2) First, as shown in Figure 2, a through hole is drilled in the approximately horizontal direction in the head of the embankment body as close to the shoulder as possible. .

Then, the reinforcing bar 1 is inserted into and passed through the hole, and both ends thereof are exposed outside the hole.

Threaded portions are previously formed at both exposed ends of the reinforcing bar 1.

On the other hand, raising materials 2 are arranged at the upper end of the slope on both sides along the extension direction of the embankment body.

This raised member 2 is made of, for example, channel steel having a U-shaped cross section, and is arranged so that the groove portion faces outward.

In addition, a plurality of insertion holes for the reinforcing bars 1 are opened at intervals on the surface of the raised material 2 that contacts the slope, and the reinforcing bars 1 are inserted into the insertion holes.
Insert and position the exposed screw part.

It is to be noted that the work will be easier if the length of the raising material 2 is long enough to be held by hand.

Then, nuts or the like are attached to the threaded portions at both ends of the reinforcing bar 1 that pass through the insertion hole of the upright material 2 and fastened.

As a result, the raised material 2 acts as a bearing plate, so that the head of the embankment can be compacted from the slopes on both sides.

<Opening> Anchor reinforcing bars (Fig. 3) Next, as shown in Fig. 3, on the slope slightly below the raised material 2, an anchor is placed on the slope slightly downward toward the center of the embankment. , the anchor hole 3 is drilled.

Then, the anchor reinforcing bar 31 is inserted into the anchor hole 3 up to the milky part.

A backer 32 is attached to the anchor reinforcing bar 31 at the back of the hole on the planned excavation line on the slope.

Further, the anchor reinforcing bars 31 are removably connected by a dipping metal fitting 33 so that the outside of the hole on the planned excavation line on the slope can be removed.

However, after the slope is excavated, the steel fittings 33 are installed so that the ends of the anchor reinforcing bars 31 on the outside of the hole protrude slightly from the slope.
Install it a little closer to the outside of the hole than the planned excavation line on the slope.

Further, after the slope surface is excavated, a threaded portion is previously formed in a portion of the anchor reinforcing bar 31 that protrudes from the slope surface.

Then, the anchor hole 3 is filled with grout material 34 using an injection pipe or the like, and after waiting for the grout material 34 to harden, the end of the anchor reinforcing bar 31 outside the hole is fixed to a bearing plate or the like disposed on the slope.

Excavation of Kuha slope (Fig. 4) Close railroad tracks or roads before excavating slopes.

Then, as shown in FIG. 4, the slope around the anchor reinforcing bars 31 is excavated at a steep slope at a predetermined angle.

Simultaneously with the excavation, the grooved metal fittings 33 are removed, and the outer part of the anchor reinforcing bars 31 is removed.

Note that by attaching the backer 32, it is possible to prevent the grout material 34 from flowing out from the anchor hole 3.

<2> Installation of drain material (Figures 4 and 6) Next, step 1.
As shown in FIG. 4, a plurality of drain materials 4 are placed at intervals on the slope after excavation.

Moreover, the drain material 4 is installed vertically so as to be continuous in the vertical direction of the embankment body.

This drain material 4 collects spring water and rainwater inside the embankment,
This is to ensure good drainage.

For example, as shown in FIG. 6, it is conceivable that the water-permeable sheet 41 is formed into a cylindrical shape, and a corrugated spacer 42 is attached therein in order to secure the internal space of the water-permeable sheet 41.

Figure 4.5: Installation of bag Next, as shown in Figure 14.5, a bag 5 made of cloth or the like is installed over the entire excavated slope, overlapping the drain material 4.

At this time, the exposed end portion 35 of the anchor reinforcing bar 31
Penetrate through the center of the

The penetrating portion of the anchor reinforcing bar 31 of the bag body 5 is perforated to prevent the mortar 51 injected into the bag from flowing out.

Next, mortar 51 such as early strength mortar is injected into the bag body 5.

After the mortar 51 has developed a predetermined strength, a bearing plate, nuts, etc. are attached to the exposed end portion 35 and fastened.

After constructing the first stage as described above, proceed downwards to construct the second, third, and so on in the same manner.

After the construction is completed, the closure of the railway or road will be lifted.

<Other Examples 1> As another example, as shown in FIG. 7.8, it is also possible to introduce prestress by using tensile material 6 instead of anchor reinforcing bars 31.

In this case, first, the slope is steeply excavated at a predetermined angle, the tensile material 6 is inserted into the hole drilled in the slope, and the quick-setting material 61 or the like is applied to the deep part of the tensile material hole. Fill and fix.

Next, the exposed end of the tensile material 6 is penetrated, the bag 5 is attached to the slope, and the mortar 51 is injected into the inside of the bag 5.

After the mortar 51 develops a predetermined strength, the tensile material 6 is tensioned to fix the exposed end of the tensile material 6 to the bag body 51.

Finally, the anchor hole is filled with grout 62 to complete the work.

<Other Embodiment 2> In the above embodiments, the reinforcing bars I are installed at the head of the embankment in a substantially horizontal direction, but as shown in FIG. If one side is a cut surface, it is conceivable to use anchor reinforcing bars 7 to compact the head of the embankment body.

In this case, an anchor hole is drilled in the head of the embankment in a substantially horizontal direction from the slope, and the anchor reinforcing bar 7 is inserted into the anchor hole.
This is a method in which the grout material 71 is inserted and fixed with grout material 71.

<Effects of the Present Invention> Since the present invention has been described above, the following effects can be expected.

(a) In the steep slope construction method, the work must be completed within a short period of time after railways, roads, etc. are closed and before they are restarted.

However, in the conventional spraying method using concrete, the anchor cannot be tightened unless the concrete has sufficient strength, and it takes time.

In addition, it is not suitable for use in steep slope construction methods because the work may become impossible due to unforeseen accidents (spraying equipment malfunctions, etc.), and the work takes a lot of time.

In contrast, in the present invention, since a bag-shaped formwork is present in spraying compared to concrete, anchors can be tightened even if the strength of concrete is low to some extent.

Therefore, construction can be completed in a short period of time, and it can be said that this method is a legacy of the steep slope construction method for embankments.

Furthermore, since spraying does not require equipment such as a machine, the work will not be interrupted due to unexpected accidents (spraying machine failure, etc.).

<Exposure> In the case of conventional sprayed concrete, it may float off the ground due to spring water, rainwater, etc., making it difficult to securely hold down the slope.

In contrast, the present invention uses a bag made of cloth or the like as a formwork for concrete, so it has good adhesion to the ground.

Furthermore, by arranging the drain material between the bag and the slope, spring water, rainwater, etc. can be drained well.

Therefore, it is hardly affected by spring water or rainwater, and can reliably hold down the slope.

<C> The conventional method of covering slopes with concrete plates or steel sheet piles has poor workability and takes a lot of time because the concrete plates are heavy.

However, in the present invention, since a lightweight bag is used, installation can be performed easily and in a short time, and workability is improved.

(2) Since the present invention can be constructed in a short period of time, it is particularly suitable for work during the suspension time of commercial lines.

<E> By compacting the head of the embankment with reinforcing bars or the like at an early stage without damaging the slope, it is possible to suppress the lateral deformation of the embankment that occurs when excavating the slope.

Therefore, the subsidence and horizontal displacement of the roadbed and roadbed on the upper surface of the embankment body can be minimized, and safety is increased.

To compact the head of the embankment, all you need to do is install reinforcing bars and the like in a substantially horizontal direction at the head of the embankment, so all work can be done from the side.

Therefore, there is no need to close the route, and the work can be carried out by driving slowly.

Therefore, more time will be available for work after the route is closed.

[Brief explanation of drawings]

Fig. 1: An explanatory diagram of one embodiment of the present invention Fig. 2: An explanatory diagram of compaction of the head of the embankment body Figs. 3 to 5: An explanatory diagram of the construction method Fig. 6 An explanatory diagram of Nidrene material Fig. 7.8 Figure: Explanatory diagram of other embodiment 1 Figure 9: Explanatory diagram of other embodiment 2

Claims (3)

[Claims] (1) In the method of excavating the slope of an embankment to make it steeper, reinforcing bars are passed through the head of the embankment in a substantially horizontal direction, and both ends of the reinforcing bars are extended along the extension direction of the embankment. Anchor reinforcing bars are anchored to the raised material placed at the upper end of the surface, and anchor reinforcing bars are anchored to the slope below the raised material so as to be slightly inclined downward toward the center of the embankment. The slope around the anchor rebar is excavated at a steeper slope, the exposed end of the anchor rebar is penetrated, a bag is attached to the slope, mortar is injected into the inside of the bag, and the mortar has a specified strength. A method for steepening embankment slopes, which is characterized by fixing the exposed ends of anchor reinforcing bars to the bag body after the occurrence of this problem. (2) In the method of excavating the slope of the embankment to make it steeper, reinforcing bars are passed horizontally through the head of the embankment, and both ends of the reinforcing bars are attached to the slope along the extension direction of the embankment. It settles on the raised material placed at the upper end, and then the slope below this raised material is excavated at a steeper slope. A hole is drilled with a slight downward slope, and a tensile material is inserted into this hole to secure the deep part of the hole in the tensile material.Then, the exposed end of the tension material is penetrated and the bag is placed on the slope. Installation: Mortar is injected into the inside of the bag, and after the mortar develops a predetermined strength, the tensile material is tensioned to fix the exposed end of the tensile material to the bag. Method for making slopes steeper. (3) In the method for steepening the slope of an embankment according to claims 1 and 2, instead of reinforcing bars penetrating the head of the embankment body in a substantially horizontal direction, the head of the embankment body A construction method for steepening embankment slopes in which anchor bodies are anchored in a nearly horizontal direction.