JPS59426A - Slope protection work - Google Patents

Abstract

PURPOSE:To make easier the protection work of slope by a method in which cement mortar is placed into a formwork pipe made up by setting an upper formwork on a lower formwork partly buried in cement mortar, etc., sprayed on a slope, and then the upper formwork is removed. CONSTITUTION:In a formwork pipe 1 consisting of upper and lower formworks 11 and 14, L-shaped couplers 13 are formed throughout the whole length of the lower ends of side plates 12 facing the formwork 11. The width of the formwork 14 of the same length as the formwork 11 is matched with the interval between the plates 12 and coupling pieces 15 are vertically erected in mutually facing manner throughout the whole length in the longitudinal direction of the formwork 14. The pieces 15 are projected from concrete 5 sprayed with a given width on a slope A, part of the formwork 14 is buried, iron bars 2 are set, and the couplers 13 are fitted into the pieces 15 to set the formwork 11. Then, cement mortar 4 is placed into the pipe 1 and hardened, the formwork 11 is removed, and concrete structure C is constructed. In the next place, the structure C is likewise constructed.

Description

[Detailed description of the invention] This invention relates to a slope protection method.

Conventionally, methods for protecting slope surfaces include mortar spraying, masonry, concrete retaining wall, slope framing, and Ankani method, but each of these methods has its own drawbacks.

In other words, the mortar spraying method lacks durability, and the masonry construction method and concrete retaining wall construction method require a great deal of labor, are dangerous, and have high construction costs.

Furthermore, when constructing the slope method, the cut slope is generally very uneven and the work is performed on a slope, so it takes time and money to assemble the formwork, and skilled workers are required to assemble the formwork.

This invention has been made in order to improve the above-mentioned drawbacks, and aims to stabilize the slope by forming a slope frame on the slope according to the invention.

However, this method is completely new to the conventional method of constructing the slope, and it is easy to construct and can significantly shorten the construction period.
The purpose is to provide a slope protection construction method that can reduce construction costs.

In addition, parts used once for construction can be used repeatedly,
The purpose is to provide a slope protection method that can reduce construction costs.

Next, the invention will be described in detail based on the illustrated embodiments.

The slope protection method according to the present invention is characterized in that a formwork pipe that can be assembled freely is placed on the slope, concrete or mortar is poured into the formwork pipe, and a concrete structure is constructed.

[1] Formwork Pipe The formwork pipe 1 is constructed by dividing into an upper formwork 11 and a lower formwork 14 and assembling nine parts. The upper formwork 11 is a member having a curved cross section, but various other shapes such as a chevron shape and a semicircular shape can be adopted. The upper formwork 11 can be made of various materials such as steel plate, synthetic resin, and wooden cape.

The upper formwork 11 has opposing side plates 12, 12 with locking portions 13, 13 having an L-shaped cross section formed over the entire length of the lower ends thereof.

The lower formwork 14 is a rectangular steel plate, and its total length is made to be the same as that of the upper formwork 11, and its width is made to match the interval between the side plates of the upper formwork 11. A locking piece 15.15 is vertically erected along the entire length of the lower formwork 14 in a direction opposite to each other.

The work part formwork 14 can also be formed from a member such as expanded metal.

This is to ensure that when the lower formwork 14 is partially buried in mortar or concrete, as will be described later, it will be well anchored to the mortar or the like.

Therefore, in the case of a steel plate, it is conceivable to open a large number of holes 16 as shown in FIG.

[2] Fixing of lower formwork In implementing the slope protection method according to the present invention, first, a plurality of lower formworks 14 are fixed to the slope.

The lower formwork 14 is fixed by spraying a certain amount of mortar or concrete 5 onto the ground, and partially burying it in the mortar or the like 5. The locking pieces 15, 150 are installed so as to protrude somewhat above the mortar or the like. Since the lower formwork 14 is installed after spraying mortar etc. 5 on the uneven ground, there is no bending of the lower formwork 14, and even if the upper formwork that can be climbed later is installed, the lower formwork There will be no gap between the 14 and the upper formwork.

After the lower formwork 14 is buried and fixed on the slope by a known method, the upper part of the anchor is made to protrude from a hole provided on the side of the lower formwork 14 at an appropriate distance, and after the mortar etc. 5 has hardened, it is placed on the upper part of the anchor 3. The lower formwork 14 is fixed by means such as fitting nuts into carved screws.

Moreover, at this time, it is possible to apply primary tension to the anchor 3 to temporarily support a slope that is prone to collapse.

[3] Rebar arrangement Reinforcement bars 2 are arranged on the lower formwork 14. The reinforcing bars 2 can be arranged easily if a shape that allows several reinforcing bars to be placed on the lower formwork 14 is provided in advance.

For example, the four reinforcing bars 2 may be made parallel and connected together by a square bar.

[4] Installation of upper formwork The upper formwork 11 is installed on the lower formwork 14. Upper formwork 1
The locking portions 13.13 of the side plates 12, 12 of No. 1 are fitted into the locking pieces 15.15 of the lower formwork. Therefore, the reinforcing bars 2 are housed in the formwork pipe 1 constituted by the upper formwork 11 and the lower formwork 14.

The upper part of the anchor 3 is inserted into the opened hole in the upper formwork 11 so that it protrudes from the upper surface of the upper formwork 11, and is widely fixed with nuts or the like.

[5] Casting mortar etc. Concrete or mortar 4 is placed inside this formwork pipe 1.
(Fig. 3).

A foundation concrete 6 has been constructed at the bottom end of the formwork pipe 1, and concrete or mortar 4
is poured into the formwork pipe 1 from above. The concrete or mortar 4 is not of low slump and flows from top to bottom and fills the formwork pipe 1.

The lower formwork 14 is installed on mortar or concrete sprayed on the ground to prevent it from bending, so there is no gap between the lower formwork 14 and the upper formwork 11, and the inside of the formwork pipe 1 is Mortar etc. will not flow out.

[6] Removal of the upper formwork After the mortar 4 and the like have hardened, the upper formwork 11 is removed, and the concrete structure C is constructed.

The removed upper formwork 11 can be used repeatedly for the next construction, and construction costs can be reduced.

By applying secondary tension to the anchors 3 of this concrete structure C, it is possible to resist slopes that are prone to collapse.

[7] Although the concrete structure C is constructed on the slope by the above-mentioned six operations, it is also possible to form the structure C in a lattice shape as a slope.

Formwork is assembled in a direction crossing the existing concrete structure C, and concrete or mortar is poured.

That is, as shown in Fig. 4, horizontal reinforcements 7 are provided that penetrate the concrete structure C at right angles and parallel to the slope.
Formwork 8 is installed parallel to both sides of the horizontal reinforcement 7.

The formwork 8 is made of wire mesh, steel plate, synthetic resin, paper, etc.
The distance between them is maintained by spacers, and the anchors 3 are used to install and fix them on the slope.

Mortar or concrete is poured between the formworks 8, and a legal frame is constructed as a concrete structure C in the form of a lattice with continuous vertical beams.

The vertical beam formed by the formwork pipe IK resists the main soil pressure, and the structure is excellent because the beam formed by the formwork 8 resists small-scale earth pressure.

Since the slope protection method according to the present invention has the above configuration, it can obtain the following effects.

■ Since it is only necessary to combine the formwork pipes, the assembly of the formwork on site is labor-saving and the construction period can be significantly shortened.

＠ Because concrete or mortar is poured into the formwork pipe, the work time can be significantly reduced compared to spraying.

θ Formwork pipes that are dismantled after hardening of concrete can be used for further construction, making it possible to reduce construction costs.

[Phase] The lower formwork is partially buried above the mortar sprayed into the ground, so it does not bend, and when the upper formwork is installed, the mortar will not flow out through the gap. This eliminates waste during construction.

Additionally, this invention is extremely effective as a protection method for long slopes.

When cutting down a mountain or the like to form a long slope, as shown in Figure 5, slopes a, b, ... e are gradually cut from the top of the existing ground A along the planned excavation line B. A method of forming is adopted.

The problem with these construction methods is the loosening of the ground prior to the construction of slope protection methods such as the slope construction method, concrete retaining wall method, mortar spraying method, and Ankani method.

That is, when forming the slopes a, b, .

It has also been found that initial loosening has a significant impact on long-term slope stability, and it is important to prevent early rock loosening for long-term slope protection.

As described above, when forming a long slope, this invention can prevent the initial loosening of the ground during the slope work, and can provide long-term slope protection after the slope has been formed. The purpose of this invention is to provide a protection method for long slopes that allows surface formation work to be carried out extremely safely and to shorten the construction period.

Furthermore, the purpose is to provide a long slope protection construction method that is easy to construct, does not require highly skilled workers, and can shorten the process and reduce construction costs. The invention will be described in detail based on the following.

) (a) Slope formation and earth retention In Figure 5, when cutting down rock mass A to form long slope B, start cutting from the top of the slope, and then create slopes a, b, etc.
- Gradually form e in a step-by-step manner.

In this case, earth retaining is performed on slopes a, b, . . . e at the same time as cutting down (Figure 6).

Earth retention is performed by installing the lower formwork 14 of the formwork (Eve 1) on the slope as described above, applying primary tension to the anchor 3, and performing earth retention. As a pressure plate, it prevents the initial loosening of the ground.

(b) Continuation of slope formation work If the upper slope a is earth-retained, slope a will be prevented from collapsing, so the work to form the lower slopes S, c, d, and e can be done safely and quickly. (Figure 6). Therefore, the earth retaining work for the upper slope is performed sequentially, and the lower slope is formed repeatedly to form the long slope B (FIG. 7).

[C] Casting of concrete, etc. As described above, reinforcing bars 2. An upper formwork 11 is assembled to form a formwork pipe 1, and mortar or concrete 4 is poured from above to construct a concrete structure C.

The construction of the concrete structure C can be performed in parallel with the earth retaining work and the slope forming work.

(d) Removal of the upper formwork After the mortar or concrete 4 in the formwork pipe 1 has hardened, the upper formwork 11 is removed and the concrete structure C is constructed.

By applying secondary tension to the anchors 3 of this concrete structure C, the slope can be stabilized.

(e) In addition, formwork 8 is constructed using the method already described for concrete structure C mentioned above.
By placing horizontal reinforcements 7 and pouring concrete, etc., a concrete structure C with continuous vertical beams in a lattice pattern can be created.
(Fig. 8).

Since the slope protection construction method according to the present invention has the above configuration, the following effects can be obtained even when constructing a long slope.

■ When forming a slope, a rigid formwork pipe is attached to an anchor and used as a bearing plate to prevent the initial loosening of the ground and ensure safe work.

0 In addition, this invention can be applied not only to road slopes and dam slopes, but also to slopes of steep slopes and slopes that require emergency rock collapse, but it can also be applied to slopes with densely populated houses, etc., where special temporary earth retaining equipment is not required. Therefore, it is very effective.

[Co., Ltd.] After forming the slope, concrete structure C is constructed using formwork pipes, and secondary tension can be applied to maintain and stabilize the slope over the long term. .

0 In addition, it is possible to obtain the same effects as described above, such as speed of work and lower construction costs.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an embodiment of the formwork pipe used in the slope preservation method according to the present invention, Fig. 2 is a perspective view of the formwork pipe in an assembled state, and Fig. 3 is a perspective view of the formwork pipe in the assembled state. Explanatory drawings, Fig. 4 is a perspective view of the construction state, Figs. 5, 6, and 7 are explanatory drawings of the construction order when constructing a long slope, and Fig. 8 is a completed perspective view. 1. Formwork pipe, 2. Rebar, 3. Anchor, 4, 5. Mortar, concrete, 1
1. Upper formwork, 14. Lower mold rod, A. Earth, B.
・Slope, C... Concrete structure.

Claims (2)

[Claims] (1) Install the lower formwork by partially burying it in mortar or concrete sprayed on the ground, arrange reinforcing bars on the lower formwork, and then install the upper formwork. and a formwork pipe consisting of a lower formwork are combined to form a formwork pipe,
A slope protection construction method characterized by constructing a concrete structure by pouring mortar or concrete into the formwork pipe, and then removing the upper formwork of the formwork pipe. (2) When forming a long slope, a lower formwork partially buried in mortar, etc. sprayed onto the ground is placed on the already formed slope to give primary tension to the anchor and retain the soil. - Tomo K, continue the slope forming work to form the entire long slope and sequentially perform earth retaining, and at the same time, sequentially attach upper formwork to the lower formwork to form a formwork pipe, A slope protection method characterized by constructing a concrete structure by pouring mortar or concrete, removing the upper formwork after the mortar has hardened, and applying secondary tension to the anchor.