JPH09279610A - Method for constructing retaining wall and equipment therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute an operation safely while dispensing with a form carpenter and shortening a period of construction, by forming a rear form by wedding a wire net to the lateral side of angle steel, and by conducting a process of assembling the rear form, a process of fitting separators and a process of depositing concrete. SOLUTION: An assembly formed by assembling rear forms 1 is fixed on foundation concrete 8. Next, concrete blocks 5 are assembled by using the rear form 1 as a base by using separators 3. On the occasion, the blocks 5 are made 80-120cm long, 50-100cm wide and 5-20cm thick. Then, a weep pipe 13 is inserted into necessary places of a wire net 1a and the blocks 5. The dimension in the direction of elongation of a mesh of this wire net 1a is made 5-16mm, the dimension in the direction perpendicular to that of elongation 10-30mm, the thickness 0.1-2.5mm and the width of the part of thickness thereof 1-3mm. Moreover, the diameter of a wire is made 1-2mm and the mesh 5-30mm. The concrete is deposited between the blocks 5 and the form 1 and pebble stones C are filled between a hillside and the form. According to this constitution, the strength of a retaining wall as a whole is increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a device for constructing a concrete block retaining wall in which concrete blocks to be used for roads, revetments, etc. are piled up by using concrete containing concrete and pebbles.

[0002]

2. Description of the Related Art A conventional retaining wall construction device is shown in FIG.
Install the concrete block 5 on the front as shown in
The construction equipment in which the backside frame 10 composed of asbestos board, cement slate board, plywood or metal foam and the concrete block 5 are supported by the support rods 11 on the hillside surface, and the backside frame 10 is supported by the ground by the support 12. Are known. This construction method requires complicated on-site work such as formwork and support work, requires a lot of skilled workers and manpower, and after construction, it takes time and labor to disassemble the backside mold 10 on the hillside, resulting in a long construction period. However, there is a problem that the construction cost becomes expensive.

Then, the concrete blocks 5 are stacked one by one on the foundation 8 which has been preliminarily constructed, and the drainage pipe 13 is appropriately arranged between the stages, so that the concrete blocks 5 and the back mold 10 are successively packed. A technique is also known in which concrete is cast, the support 12 is removed after curing, the formwork 10 is deframed, and the back surface of the retaining wall is backfilled with pebbles.

Further, as shown in FIG. 15, the water draining pipe 13 is generally positioned by a nail 20 on the rear form 10, and is generally tied and fixed to the nail 20 with a wire 21.

It is the largest cause of the removal of permeated water on the hillside of the retaining wall and the collapse of the front surface of the poor retaining wall, and it is difficult to solve it in the retaining wall construction method until today. Asbestos boards, plywood, and cement straight boards are nailed to temporarily fix the pipe inside the retaining wall, and the pipe is fixed to secure the wire, but the gravity of the concrete is poured from above. This pipe is misaligned, concrete flows in from the gap, and most of the pipe is clogged, so back-flushing water fills up, causing a major collapse of the front wall of the retaining wall. There is.

[0006]

However, in the conventional construction method and apparatus as described above, it is necessary to remove all of the rear mold 10 and the vertical flap material 14 and the horizontal flap material 11 after the concrete is placed. A long work period is required because the man-hours for deframing work and the backfill work after deframing are performed. And since the work on the back side of the retaining wall is always in danger of falling rocks and the collapse of mountains, the work site has a large amount of excavated soil and a large risk of falling rocks in order to secure a working space for workers from the viewpoint of safety. There is a safety problem in work. Further, the construction of the formwork requires a formwork carpenter who has a skilled and specialized technique.

Therefore, in view of the above problems, the present invention does not require a formwork carpenter, and by filling the back formwork, the man-hours of the work can be reduced, the construction period can be reduced, and safe work can be achieved. It is an object of the present invention to provide a retaining wall construction method and device that enables complete drainage of water, strengthens the retaining wall strength, and improves concrete quality.

[0008]

According to the present invention, a wire mesh is welded to the side surface of a metal angle to form a back mold, and holes formed in the vertical ribs and the horizontal ribs on the outer side of the back mold. Back formwork assembling process to fasten adjacent back formwork to each other with U-shaped clips, and perforated the ribs of the back formwork by separators which are bent at both ends to prevent floating when applying vibrader. A cylinder for simultaneously performing a separator assembling step of connecting a hole and a connecting member embedded in a concrete block, a cylinder-filling concrete placing operation of burying the back formwork and placing concrete, and a gravel stone backfilling operation at the same time. A method for constructing a retaining wall is provided, which includes a step of placing concrete into the wall.

Further, according to the present invention, water-soluble paper is attached to the wire mesh.

Further, according to the present invention, the back mold is formed by welding the wire mesh on the side surface of the metal angle, and the back mold is attached to the holes formed in the vertical ribs and the horizontal ribs provided in the back mold. A U-shaped clip for connecting the rear formwork to each other, and a separator bent at both ends for connecting the rear formwork and the hole of the connecting metal fitting embedded in the concrete block to prevent floating when a vibrader is applied. Is provided.

Further, according to the present invention, the concrete block has a length of 80 to 120 cm and a width of 50 to 100 c.
m is a concrete block having a thickness of about 5 to 20 cm, the wire mesh is made of expanded metal, and the mesh has a dimension in the extending direction of 5 to 16 mm, a dimension in the direction perpendicular to the extending direction is 10 to 30 mm, and a thickness of 0. .7 to 2.5 m
m, and the width of the thickness portion is preferably 1.0 to 3.0 mm.

The wire mesh is a crimp wire mesh made by combining steel wires in a straight line and having a wire diameter of 1.0 to 2.0 m.
m, the mesh may be 5 to 30 mm.

If the mesh of the wire mesh is too large,
Outflow of the stuffed concrete into the gravel occurs, and when it is too small, edging occurs between the reinforced concrete and the gravel. However, each size of the mesh prevents both the outflow and the edging.

Further, according to the present invention, the wire mesh is provided with a hole for the water draining pipe, and the pipe provided in the hole for the water draining pipe is provided with a clogging prevention cap.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, a concrete block 5, a metal angle 2 described later, and a formwork in which a rear formwork 1 formed in a square shape with a metal mesh 1a are assembled are connected to each other by a separator 3 to drain water. Referring also to FIG. 8, the pipe 13 is shown as being attached between the hole 1b provided in the wire netting 1a and the hole 5a provided in the concrete block. In addition, the code | symbol G has shown the mountainside and C has shown the gravel stone, respectively.

FIG. 2 is a side view seen from the front side along the hillside of FIG. 1, in which the concrete block 5 has a separator 3 which is bent at both ends of a round bar so as to prevent it from floating when a vibrating radar is applied. A connecting member 5a into which one end is inserted is buried, and is connected to a hole 2c provided in the lateral rib 2b of the back mold 1 by a large number of separators 3. A cap 13a for preventing clogging is attached to the water drain pipe 13. Where the code K
Indicates a concrete nail.

FIG. 3 is a perspective view showing the rear formwork 1,
Square shape with metal angle 2 and surrounding vertical ribs 2
A wire mesh 1a made of expanded metal is welded to a frame made up of a, a horizontal rib 2b, and two intermediate horizontal ribs 2b. It should be noted that the number of intermediate horizontal ribs is not limited to two, and in the case where the wire mesh is expanded metal,
Referring to, the mesh size SW in the extension direction is 5 to 16 m.
m, the dimension LW in the direction orthogonal to the extension direction is 10 to 30 m
m, the thickness T is 0.7 to 2.5 mm, and the width W of the thickness portion is preferably 1.0 to 3.0 mm.

Further, the wire mesh is not limited to expanded metal, and in the case of a crimp wire mesh in which steel wires are orthogonally combined, the wire diameter is 1.0 to 2.0 mm and the mesh is 5 mm.
It may be selected from the range of up to 30 mm.

FIG. 4 shows a combination of the back molds 1 in which a plurality of the back molds 1 are combined (the illustrated example is a combination of four). ,
The holes 2c of 2b are aligned, the bent portion 4a of the U-shaped clip 4 (see FIG. 5) is inserted into the hole 2c, and the clip 4 is rotated about the axis of 4a so that two U-shaped portions 4b are overlapped. Adjacent formwork can be joined by fitting it to the rib part which is.

FIG. 7 shows a cap 13a for preventing clogging which is attached to the water draining pipe 13, and a plurality of caps (6 in the example shown in the figure) to be inserted into the pipe when being attached to the main body 20.
(See FIG. 8), the main body 2
Since the wire mesh 22 is attached to 0, the cap 6
When attached to the drainage pipe 13, the drainage pipe 13 can be prevented from being clogged when placing concrete or backfilling gravel stones, and the permeated water in the gravel stones on the hillside can be completely drained.

9 to 11 show typical examples of various concrete blocks 5, and FIG. 9 comprises a flat plate portion 25 and a strip-shaped convex portion 26 projecting from the flat plate portion 25. In the illustrated example, the strip-shaped convex portion 26 is shown. 2 are provided, and the strip-shaped convex portion 26 allows the concrete block 5 to be firmly integrated with the case-filling concrete. Here, reference numeral 5a indicates an embedded connecting member having a hole 5b into which the L-shaped portion of the separator 3 is inserted. In the figure, 5c is a handle that constitutes the separator 3 and the engaging member.

FIG. 10 shows a concrete block composed only of a flat plate portion, and a handle 5c which is a connecting member engaging with the separator 3 is provided on the back surface thereof. The length L in the longitudinal direction is 100 to 120 cm, and the width W is 5.
A block having a size of 0 to 100 cm and a thickness T of about 5 to 20 cm is preferable.

Further, FIG. 11 shows a concrete block 5 formed in a + shape only with a flat plate portion, and if arranged as shown in FIG. 12, a strong retaining wall can be constructed without being displaced from each other. it can.

In the conventional construction method shown in FIG. 15, assuming the position of the drainage pipe from the hillside G of 10 such as asbestos, board, cement slate board, and plywood, nailing 20 is performed, the drainage pipe 13 is temporarily fixed, and the wire 21 Fix with.

The construction method will be described below with reference to FIGS. 1 and 2.

First, the foundation concrete 8 is placed, and on the foundation concrete on the upper part of the foundation concrete worker, the back mold 1
Are fixed to the foundation 8 with concrete nails K as an assembly assembled by the required number of U-shaped clips as the first stage. In this case, the mold assembly of the conventional method is assembled on the hillside, but the working space on the hillside is about 1/3 the volume of the conventional method. Next, the concrete block 5 is assembled with the separator 3 using the backside mold 1 as a base. A hole is made at a required position between the expanded metal (metal mesh) 1a of the rear frame and the block 5, a drainage pipe 13 is inserted, and a cap 6 for preventing clogging is set on the expanded metal side of the pipe.

A concrete D is placed between the concrete block 5 and the rear form 1 and the rear form 1
Fill gravel stone C between the mountain and the hillside. In this case, if water-soluble paper (not shown) is attached to the expanded metal (wire mesh), when the placed concrete is vibrated, it prevents the concrete from passing through the expanded metal mesh and flowing into the pebbles. it can. Then, after the vibrator is applied, the paper is melted and the concrete is partially extruded toward the gravel stone side and hardened, and as shown in FIG. 13, the reinforced concrete D is integrated with the gravel stone C like E, There is an advantage that the strength of the retaining wall is improved.

Due to the expanded metal 1a, the conventional mold 10 of FIG. 15 has no outlet for excess water of concrete, and the excess water of the cast concrete remains inside, thus deteriorating the strength of the concrete quality. However, since this surplus water is removed to the gravel side of the back surface by utilizing the gap of the expanded metal 1a, it is possible to obtain high-quality concrete of uniform density. The retaining wall of the required area can be constructed by expanding the retaining wall one by one as described above, and the vertical and horizontal ribs of the rear formwork are steel frames that are buried and the retaining wall is extremely strong. Therefore, it does not need to be deframed because it is buried, and the construction period is fast and the cost is low.

[0030]

EFFECTS OF THE INVENTION Since the present invention is configured as described above, the mold carpenter of a special worker is not required, the concrete placing work and the backfilling work can be carried out at the same time, and the rear formwork can be unframed. Since there is no work and the concrete curing period is only 1/3 of the conventional period, the number of man-hours is reduced, and the period and cost can be shortened.

Further, since the work on the rear surface of the retaining wall is unnecessary, the safety is greatly improved, surplus water can be safely removed through the wire net, and the backfilled pebbles and retaining wall are integrated and the metal angle is also buried. It has the effect of a steel frame. In addition, the seepage water in the pebbles is completely drained. Also, on the back which is the back gravel side, the concrete coming out of the mesh of the wire mesh becomes uneven, meshes with the back gravel on the back (clogging) and is integrated with the back gravel,
The coefficient of friction is large with respect to the back soil pressure. This method will contribute to the increase of the strength of the entire retaining wall and the quality of the retaining wall concrete.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a side sectional view showing a main part of FIG. 1;

FIG. 3 is a perspective view showing a rear formwork.

FIG. 4 is a perspective view showing a combination body in which four rear surface molds of FIG. 3 are combined.

FIG. 5 is a perspective view showing a U-shaped clip.

FIG. 6 is a front view showing an example of the shape of a wire mesh.

FIG. 7 is a perspective view showing a cap for preventing clogging.

FIG. 8 is a perspective view showing a state in which a drainage pipe is inserted into a wire mesh and a cap is attached.

FIG. 9 is a perspective view showing a concrete block.

FIG. 10 is a perspective view showing another concrete block.

FIG. 11 is a perspective view showing another concrete block.

FIG. 12 is a front view showing a state where the concrete block of FIG. 11 is constructed.

FIG. 13 is a view showing a state in which the body-filled concrete and pebbles are integrated.

FIG. 14 is a sectional view illustrating a conventional technique.

FIG. 15 is a perspective view showing a mounting portion of a conventional water draining pipe to a back mold.

[Explanation of symbols]

 1, 10 ... Back mold 1a ... Wire mesh 2 ... Metal angle 2a ... Vertical rib 2b ... Horizontal rib 2c ... Hole 3 ... Separator 4 ... U-shaped Clip 5 ... Concrete block 5a ... Connecting member 5c ... Grip 11 ... Support rod 12 ... Support 13 ... Drainage pipe 25 ... Plate part 26 ... Band-shaped projection C ... Conglomerate D ... Concrete-filled concrete

Claims (8)

[Claims] Claims: 1. A metal mold is welded to the side surface of a metal angle to form a rear mold, and the rear molds adjacent to each other are formed by using holes drilled in vertical ribs and horizontal ribs on the outer and inner sides of the rear mold. A rear formwork assembling step of fastening the frames to each other with U-shaped clips, and a separator for connecting the holes drilled in the ribs of the rear formwork and the connecting members embedded in the concrete block by the separators having both ends bent Assembly process,
A method for constructing a retaining wall, comprising: a concrete-filling concrete placing operation of burying the rear formwork and placing concrete, and a barrel-filling concrete placing step of simultaneously performing a gravel stone backfilling operation. 2. The water-soluble paper is attached to the wire mesh.
Construction method of retaining wall described in. 3. A back mold which is formed by welding a metal mesh on a side surface of a metal angle, and a back mold which is attached to holes formed in vertical ribs and horizontal ribs provided in the back mold to mutually attach the back mold. An apparatus for constructing a retaining wall, comprising: a U-shaped clip to be connected, and a separator, which is bent at both ends, for connecting a back formwork and a hole of a connecting fitting embedded in a concrete block. 4. The concrete block has a length of 80 to
The construction device for a retaining wall according to claim 3, which is a concrete block having a width of 120 cm, a width of 50 to 100 cm, and a thickness of 5 to 20 cm. 5. The wire mesh is made of expanded metal, and the mesh has a dimension in the extending direction of 5 to 16 mm, a dimension in the direction orthogonal to the extending direction of 10 to 30 mm, and a thickness of 0.7.
The retaining wall construction device according to claim 3, wherein the width of the thickness part is 1.0 to 3.0 mm. 6. The wire mesh is composed of a crimp wire mesh formed by combining steel wires in a straight line and having a wire diameter of 1.0 to 2.0 mm,
The retaining wall construction device according to claim 3, wherein the mesh has a size of 5 to 30 mm. 7. The retaining wall construction device according to claim 3, wherein the wire mesh is provided with a hole for a drainage pipe. 8. The pipe provided in the hole for the drainage pipe is provided with an anti-clogging cap.
Retaining wall construction device described in.