JPS62107113A - Slope face protection works and structure therefor - Google Patents

Abstract

PURPOSE:To prevent damage to the longitudinal beam and enable speedy and economic execution of works by combining a longitudinal beam having rigidity and a deformable lateral beam. CONSTITUTION:A series of rigid longitudinal beams Y are constructed by spraying or pouring mortar 3 or the like. Also between and straddling the longitudinal beams, lateral beams X of linear substance deformable under function of outside force is installed. By so doing, the longitudinal beams Y prevemt the primary falling in while the lateral beams X inhibit secondary falling in, thereby enabling remarkably easy and speedy construction of lateral beams. Furthermore, economic execution of works and sure prevention of damage to the slope face framework is possible.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is directed to reducing the risk of collapse or collapse of cutting surfaces, embankment slopes, etc.
This paper relates to a slope protection method and its slope protection structure.

[Conventional technology]

In recent years, slope construction methods have become widely used for this type of slope protection. This construction method uses formwork such as wire mesh, iron plates, and corrugated poles. If necessary, reinforcing bars are placed inside the formwork, and mortar or concrete is sprayed between the formwork to construct a cross-shaped legal framework such as a well. In this case, both the longitudinal and transverse beams are dimensionally the same.

[Problem that the invention seeks to solve]

However, this type of device has the following problems.

(1) Since the vertical beam and the horizontal beam have the same cross section and the same dimensions, and have high bending rigidity, it is effective in providing uniform rigidity to the entire slope, but due to the rigidity, Brittle against additional external forces and impact forces. In particular, this occurs as a phenomenon that causes cracks to occur at the intersections of the legal frames. If an attempt was made to repair the building, it would become a large-scale construction project.

(2) Although the mechanical calculations for the bridge design focus on the strength of the vertical beams, ignoring the horizontal beams, the side beams were built with the same dimensions and the same material. is uneconomical.

(3) Mortar is mainly sprayed on the framework, and anchors cannot be placed until after the mortar has sufficiently hardened, which generally takes about 4 weeks, resulting in a long construction period. Therefore, the main purpose of the present invention is to solve the above-mentioned problems and not only enable quick and economical construction, but also to provide sufficient strength. The object of the present invention is to provide a slope protection method and a slope protection structure that can flexibly withstand external forces.

[Means for solving problems]

The method of the present invention for solving the above problems is to construct continuous first beams with rigidity in parallel in the first direction, and to create a predetermined space between the adjacent first beams by skipping the intermediate first beams. 1st of
It is characterized by being fixed across the beams at both ends or at the intermediate first beam, and in the next state, a second beam is provided, and this second beam is made of a material that can be deformed when an external force is applied in a direction orthogonal to the beam. That is.

Further, the slope protection structure of the present invention includes a rigid continuous first beam constructed by at least spraying or pouring mortar in parallel to the first direction, and a first beam extending between the first beams. It is characterized in that it consists of one beam fixed to the other and a second beam mainly composed of linear objects.

[Effect]

In the present invention, when the first beam is a vertical beam and the second beam is a horizontal beam, the vertical beam and the anchor prevent the main collapse, and the horizontal beam only prevents the secondary collapse of its original purpose. Since the structure is minimal, the construction of the cross beams can be carried out very easily and quickly.Furthermore, since the cross beams are deformable, damage to the vertical beams can be reliably prevented.

〔Example〕

The present invention will be explained below with reference to embodiments shown in the drawings. In the present invention, the longitudinal beam Y as the first beam is basically not limited as long as it has high rigidity and can resist main collapse. However, as shown in Fig. 1, for example, as in the free frame construction method, a connecting material (
1 (not shown) to stand on the slope, and if necessary, place reinforcing bars 2 between the formworks 1 and 1. After L, use mortar or concrete IJ -) (hereinafter referred to as mortar) between the formworks 1 and 1. ) 3 by spraying and finishing the surface so that the formwork 2.2 is filled in, the vertical beam Y can be constructed. Other methods may also be used, such as a core frame construction method using stepped poles, or a method using iron plates or wooden molds. The formwork may be buried or left in place, or may be removed. moreover,
The purpose of the vertical beam Y is to prevent the main collapse along the main collapse line M shown in Figure 8, so if there is a high risk of collapse,
Anchor 4 is driven underground below the main collapse line M. The anchor steel rod 4A of the anchor 4 is fixed via a longitudinal beam YK, for example, a fixing plate 5. The head of the anchor steel rod 4A and the fixing plate 5 are buried with mortar.The present invention is unique in the purchase of the cross beam Xo as the second beam. In other words, a material that can be deformed when an external force acts in the vertical direction between the longitudinal beams Y, such as a sheathed PC used for prestressed concrete using the unbonded construction method.
They are connected by a wire material 6 such as a steel material (composite stranded wire) or a small diameter steel rod or steel pipe with low bending rigidity. In this case, between adjacent vertical beams Y and Y, or between vertical beams Y and Y with one vertical beam Y skipped, or between vertical beams Y and Y with several vertical beams Y skipped, as shown in Figure 2. In addition, when the linear object 6 is installed astride between the longitudinal beams Y and Y, which are fixed at both ends to the longitudinal beams Y and Y with fixing plates 7 and nuts, It is better to have the linear object 6 pass through the intermediate longitudinal beam Y. In this case, the linear object 6 should have a guide tube 8 for cutting the edge of the mortar placed in advance at the longitudinal beam Y position. After placing the mortar, it is best to loosely insert the guide tubes 8.If the guide tubes 8 are similarly provided for the fixing longitudinal beams Y and Y at both ends,
The linear object 6 can be suitably tensioned. In addition, if necessary, the linear object 6 may also be fixed to the intermediate vertical beam Y. 〇9 is provided as necessary.The entire slope TFC is laid between the slope frames. Wire mesh or net.

For example, the following order should be followed during construction.

(1) Formwork 1, 1 and reinforcing bars 2 are arranged at predetermined positions in the vertical direction of the slope.

(2) At this time, the guide tube 8 is placed in advance at the longitudinal beam position, and a cut pipe 10 made of a PVC pipe or a steel pipe is placed at the anchor installation location.

(3) Spray mortar between formwork 1.1! Fill the mortar by pouring 〇(4) Wait for the strength of the mortar to develop, perform anchor work, and tension and fix it to the vertical beam 〇(5)
A little before and after this anchor work, temporary installation of linear objects will be carried out.

(6) After that, tension the linear object.

Incidentally, a large number of concrete bars 11 may be attached to the linear object 6, as shown in FIGS. 4 and 5. This attachment can be carried out by inserting the linear object 6 through the protrusion 11. In this embodiment, it functions as a protection body that prevents fine earth and sand from flowing down. Alternatively, as shown in FIG. 6, a vegetation container 12 can be attached and vegetation can be grown using the soil inside the container. In addition, you can @ dimension the value soil bag. The area surrounded by the legal framework includes vegetation, bagging,
In such a slope protection structure, as shown in Fig. 8 for reference, the vertical beam Y, together with the anchor A, will prevent the main collapse from occurring. In addition, against falling rocks, extrusion of earth, pebbles, etc. floating up through the wire mesh, the cross beams S
). For example, when the rock 13 is extruded as shown in FIG. 9, the linear object 6 itself deforms,
Prevents force from being transmitted to the longitudinal beam Y. Therefore, damage to the vertical beams is prevented.On the other hand, when constructing the horizontal beams In addition, there is no need to wait until the cross beam is completely hardened before anchoring work. In addition, in the past, a vertical beam with a larger cross section than necessary was required in view of the occurrence of cracks at the intersection point, but according to the present invention, as shown in Fig. 7, only a portion of the anchor It is sufficient to make the vertical beam Y large and have a small cross section. In this way, overall it is extremely economical.By the way, in the above example, the longitudinal beams are rigid beams and the horizontal beams are deformable beams using linear objects, etc., but if necessary, the longitudinal beams can be deformed. It is also possible to use a flexible beam (second beam) and a transverse rigid beam (first beam). In this case, the legal framework will be aimed at preventing secondary collapses, such as the prevention of uprooting. In this case as well, it is desirable to drive an anchor into the rigid beam (first beam). Further, although a force is likely to be applied to the first beam in the direction from the slope shoulder to the foot of the slope, this force is supported by the second beam. Therefore, it is desirable to use a method of fixing the second beam, including its shoulder and tail, or its intermediate portion, to the ground using anchors or the like. Furthermore, according to the present invention, a diagonal frame may be used. [Effects of the Invention] As described above, according to the present invention, not only construction can be carried out very simply and economically. , damage to the legal frame can be reliably prevented.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the construction state according to the present invention, Fig. 2 is a plan view of another example, Fig. 3 is a vertical sectional view, and Fig. 4 is a plan view of yet another example. Figure 6 is a perspective view of an example of installing a vegetation container, Figure 7 is a plan view of another example of vertical beam construction, Figure 8 is a vertical cross-sectional view of a slope, and Figure 9 shows the deformation of a horizontal beam due to external force. FIG. l... Formwork 2... Rebar 3... Mortar 6...
Linear object 7. Fixing plate 8. Guide tube 9. Wire mesh
11...Concrete block X...Horizontal beam Y...
Vertical beam Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9

Claims (8)

[Claims] (1) Construct continuous first beams with rigidity in parallel in the first direction, and straddle between adjacent first beams or between predetermined first beams with an intermediate first beam skipped at both ends or intermediate first beams. A slope protection construction method characterized in that a second beam is provided in a fixed state, and the second beam is made of a material that can be deformed when an external force is applied in a direction perpendicular to the second beam. (2) In the case where the second beam is provided by skipping the middle, the slope protection method according to claim 1, in which the second beam is provided with the first intermediate beam loosely inserted. (3) The slope protection method according to claim 1, wherein the first beam is fixed to the slope by driving an anchor. (4) The slope protection method according to claim 1, wherein nets are laid in an area surrounded by the first beam and the second beam. (5) A rigid continuous first beam constructed by at least spraying or pouring mortar in parallel to the first direction, and a linear object fixed to the first beam spanning between the first beams. A slope protection structure characterized by comprising a second beam mainly composed of. (6) The slope protection structure according to claim 5, wherein the linear object is a composite stranded wire, a metal rod, or a metal tube. (7) A slope protection structure according to claim 5 or 6, wherein a concrete block is provided around the linear object. (8) Claim 5 in which a vegetation container is attached to a linear object
The slope protection structure described in item 6 or item 6.