JPH0721195B2 - Gravity type retaining wall and its construction method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a gravity type retaining wall constructed by using a retaining wall member made of reinforced concrete which is manufactured in advance in a factory or the like, and a construction method thereof.

[Prior Art] As is well known, gravity retaining walls are used in residential land development, etc.
It is constructed to prevent the cut surface of earthwork and the slope of the embankment from collapsing. Conventionally, the gravity type retaining wall is generally constructed of concrete, and as shown in FIG. 16 (d), the front surface is usually upright and the rear surface is inclined on the foundation support A such as rock. The concrete retaining wall 70 is constructed, and the retaining wall 70 has a cross-sectional structure that can withstand the pressure of the soil such as the constructed land B by itself.

Conventionally, the following construction methods have been used to construct this type of gravity-type retaining wall. That is, as shown in Fig. 16 (a), the front scaffold 71 is assembled on the foundation ground A or on the concrete foundation made by placing concrete after excavating the construction site of the retaining wall to a certain depth. . Subsequently, as shown in FIG. 7B, after assembling the back scaffold 72, the form 73 is assembled according to the outer shape of the retaining wall 70 based on a design drawing or the like. After this, as shown in FIG.
Concrete K is poured into the 73 from its upper end and placed. Then, after a certain curing period has passed and the cast concrete K reaches a predetermined strength, the form 73 is removed,
Dismantle scaffolds 71 and 72. In addition, drainage drainage pipes 74 ((b) in the figure) are buried in the retaining wall 70 at a predetermined interval. It is passed between the front and back.

[Problems to be Solved by the Invention] The conventional gravity retaining wall construction method has the following problems.

Craftsmen such as formwork carpenters are required, but it is difficult to secure them in the current situation of shortage of craftsmen.

The scaffolding needs to be assembled for the assembly and disassembly of the formwork, which requires a considerable number of days and costs.

As shown in the flow chart of the construction method in Fig. 17 (b),
The construction period for the retaining wall is very long (14 days).

The present invention has been made in view of the above points, does not require a craftsman, can be installed only by a normal worker, does not require the work of assembling a formwork or an external scaffolding, does not take much labor, and significantly increases the construction period required for the construction. It is intended to provide a gravity type retaining wall and its construction method, which have advantages such as shortening.

[Means for Solving the Problems] In order to achieve the above object, the gravity type retaining wall of the present invention is
A) After combining a large number of connecting plate members for connecting the front wall frame member, the rear wall frame member and both wall frame members made of reinforced concrete having a weight and size that can be transported by a truck, etc., and combining them in a frame shape, By stacking multiple stages and arranging them side by side in the horizontal direction, a stepped retaining wall frame is formed so that the front side is flush and the rear side gradually narrows from the bottom to the top. It is a gravity type retaining wall configured by placing concrete in the retaining wall frame, and B) the front wall frame member has a self-supporting structure in which a projecting portion is provided on the back surface of the retaining wall frame. The top and bottom of the tip of
Bolt insertion holes are pierced laterally,
C) The connecting plate member is formed in a gate shape when viewed from the front, and bolt insertion holes corresponding to the bolt insertion holes of the protrusions are laterally penetrated through the upper and lower sides of the connecting plate member, respectively. D) The rear wall frame member has a self-supporting structure in which a protrusion is provided on the back surface of the protrusion, and the rear wall frame member has a bolt insertion hole of the connecting plate member at the upper and lower ends of the protrusion. Corresponding bolt insertion holes are formed by penetrating laterally, and E) the front wall frame member and the connecting plate member, and the connecting plate member and the rear wall frame member each have a bolt hole at one end. Each of the bolt insertion holes and the bolt / nut inserted in series into the bolt hole or the long hole of the connection metal piece is connected via the connection metal object in which the long hole for the bolt is opened.

As described in claim 2, F) a projection strip is formed in a longitudinal direction on an upper end surface of a reinforced concrete slab on the front surface of the front wall frame member, and a long groove capable of fitting with the projection strip is formed on a lower end surface thereof. , G) A groove is formed in the upper surface of the tip of the protruding portion, and a groove corresponding to the groove is formed in one end of the upper end surface of the connecting plate member, and H) of the protruding portion of the front wall frame member. It is preferable to form holes for the reinforcing bars in the upper and lower surfaces of the base end portion.

As described in claim 3, I) screw portions having different screw directions are provided at both ends between the groove of the front wall frame member and the groove of the connecting plate member, and a spanner is provided in a central portion. With the adjusting metal fittings in which the box-shaped nuts are screwed, are inserted into the threaded portions of the bolts forming the fitting parts, the bolts of the adjusting metal fittings are rotated, and the front wall frame with respect to the connecting plate member is rotated. The front wall frame member can be adjusted to be flush with the lower front wall frame member by separating or approaching the upper part of the member.

The construction method of the gravity type retaining wall according to the present invention is made of preformed reinforced concrete, a front wall frame member capable of standing,
A construction method for constructing a gravity type retaining wall using a self-supporting rear wall frame member and a gate-shaped connecting plate member, characterized by the following steps: a) A front wall on a base support The frame member, the rear wall frame member at a predetermined distance, and the connecting plate member between them are respectively placed, and the corresponding front wall frame member and rear wall frame member are connected by the connecting plate member via the connecting metal fittings, respectively. At the same time, the retaining wall frame portions of the first stage are assembled side by side in the horizontal direction as well, b) the front wall frame member of the second stage is formed on the front wall frame member, and the length of the connecting plate member is formed on the connecting plate member. The second-stage connecting plate members each having a slightly shorter length are stacked, and the second-stage rear wall frame member is placed across the connecting plate members, and the corresponding front wall frame member and rear wall frame member are The connection is made by connecting plate members through connecting fittings, respectively, and they are also arranged side by side in the horizontal direction to hold the second stage. Assembling the frame part, c) By repeating the work of b) by hanging the scaffolding plate between the connecting plate members, the front walls of the multi-stage front wall frame members are flush with each other, and Assembling the retaining wall frame by stacking the rear wall frame members in a stepwise manner, d) Placing concrete in the retaining wall frame part at the lowest stage using the scaffolding plate, and then sequentially removing the upper scaffolding plate However, concrete is poured into the retaining wall frame part of each step toward the uppermost stage, and finally concrete is poured into the entire retaining wall frame.

[Operation] According to the gravity type retaining wall of the present invention having the above configuration, the foundation support is formed at the retaining wall construction site of the excavation site. Use a truck with a crane to transport the front wall frame member, connecting plate member, and rear wall frame member to the retaining wall construction site, and lower the front wall frame member to a predetermined position on the foundation support by a crane in order and arrange them side by side for self-standing. At the same time, lower the connecting plate member in sequence with a crane, but abut one end of the connecting plate member to the protrusion of the front wall frame member, insert the bolt hole and the long hole of the connecting fitting into the bolt, and attach the nut, One end of is connected to the protrusion of the front wall frame member. Then, lower the rear wall frame member in order with a crane, butt the protruding part against the rear end of the connecting plate member, insert the bolt hole and the long hole into the bolt with the connecting metal fitting, attach the nut, and attach the rear end of the connecting plate member. The projection portion of the rear wall frame member is connected to. In this way, after completing the assembly of the first-stage retaining wall,
The second-stage front wall frame member is stacked on the front wall frame member by a crane to be self-supporting. Further, a second stage connecting plate member having a length shorter than that of the first stage is stacked on the connecting plate member by a crane, and similarly to the case of the first stage, the projection portion of the front wall frame member and the connecting plate member are formed. After connecting with the adjustment connecting fitting, the rear wall frame member of the second stage is piled up with a crane, and the protrusion thereof is abutted against the rear end of the connecting plate member and connected with the connecting fitting. The retaining walls of the third and subsequent stages are assembled in the same manner as the retaining walls of the second stage described above, and then the scaffold plate is attached between the connecting plate members. In this way, concrete is poured after the retaining wall frame is assembled. Therefore, without using any external scaffolding, the scaffolding plate can be attached to the work inside the retaining wall, and the above-mentioned placing work can also be performed using the scaffolding plate in order from the bottom retaining wall frame to the concrete. Can be placed.

In the gravity type retaining wall according to claim 2, the upper part of the reinforcing bar is projected into the reinforcing bar hole of the first step projection part and the inserting part of the second step projection part is inserted into the protruding part of the reinforcing bar. By doing
The tilting of the front wall frame member can be prevented more reliably, and temporary connection with the lower front wall frame member can be performed at the same time. Especially 2
When the front surface of the front wall frame member above the step does not coincide with the front surface of the front wall frame member in the lower step, as in claim 3,
The front wall frame member, which is a heavy object, is flush with the lower front wall frame member by a simple operation by rotating the bolt of the adjustment metal fitting with a spanner or the like to tilt the upper portion of the front wall frame member in the front-back direction. be able to.

According to the construction method of the present invention having the above-mentioned configuration, the front wall frame member, the connecting plate member and the rear wall frame member are transported to the construction site of the retaining wall by a truck or the like, and predetermined on the foundation support by a truck crane or the like. Each member is lowered to the position, and the front wall frame member and the rear wall frame member are connected by connecting plate members via connecting fittings, respectively, and they are also arranged side by side in the lateral direction to assemble the first-stage retaining wall portion. Then, assembling the retaining wall of each step in the same manner (procedure) and stacking the retaining wall in order until a predetermined number of steps are used. In the process of stacking, scaffolding plates are applied between the connecting plate members of each step. Work sequentially while building internal scaffolding.
That is, the connecting plate member that connects the front and rear wall frame members is used as a support (support frame) for the scaffolding plate. When the retaining wall parts are piled up to a predetermined number of steps and the retaining wall frame is completed, concrete is placed while pulling out the scaffolding plate sequentially from the lowermost stage to the upper stage, but the front wall frame member, the connecting plate member and the rear wall frame member The retaining wall frame assembled in and is used as a formwork for concrete pouring. Further, the connecting plate member also acts as a kind of reinforcing member in the cast concrete. Further, the front wall frame member acts as a front wall (decorative plate) of the retaining wall.

[Example] Hereinafter, an example of the gravity type retaining wall of the present invention will be described with reference to the drawings together with its construction method.

FIG. 1 is a perspective view showing a completed state of assembling the retaining wall (frame) according to the first embodiment. In this embodiment, the retaining wall frame 1 is a straight type having a height of 5 m and a total length of 20 m. As shown in FIG. 2, the retaining wall frame portion 1a of each step (excluding the uppermost step) is composed of a front wall frame member 2, a connecting plate member 3 and a rear wall frame member 4, each having a height of 0.5 m. Is set to. The front wall frame member 2 is
Standard block 2a with a length of 2m, corner block 2b with a length of 1.5m
And a corner block 2c with a length of 0.5 m.
There are several types of connecting plate members 3 having different lengths in the range of 2.4 m to 0.4 m. Corresponding to the front wall frame member 2, the rear wall frame member 4 is composed of a standard block 4a having a length of 2 m, a corner block 4b having a length of 1.5 m, and a corner block 4c having a length of 0.5 m.

As shown in FIG. 1, the lowermost (first step) to the ninth step retaining wall frame portion 1a connects the rear wall frame member 4 to the front wall frame member 2 via the connecting plate member 3, and The retaining wall frame portion 1a at the uppermost stage (10th stage) is formed by directly arranging the rear wall frame member 4 directly on the front wall frame member 2 in a lateral direction (longitudinal direction of the retaining wall). The structure is such that they are connected and are also arranged side by side in the lateral direction. The front wall frame members 2 are stacked so that their front surfaces are flush with each other from the lowermost stage to the uppermost stage, and the connecting plate members 3 of each stage are stacked on the connecting plate member 3 below them. However, in the present embodiment, the rear wall frame member 4 is stacked in a staircase shape having an inclination angle of about 63 °. This corresponds to the fact that the rear surface of the conventional gravity type retaining wall is inclined as shown in Fig. 16 (d), and the stability of the retaining wall frame 1 and the rear wall frame member 4 are filled with earth. This is a treatment that takes into account the hiding.

As for the standard block 2a of the front wall frame member 2, as shown in FIGS. 3 and 4, on the back surface of the reinforced concrete slab 21 formed on both sides with outwardly tapered surfaces, a certain distance is provided in the longitudinal direction. (At a position of 0.5 m from each side), a Y-shaped protrusion 22 is provided so as to be self-supporting. The length of the protruding portion 22 is 0.24 m. A T-shaped groove 23 is provided on the upper surface of the tip of the projecting portion 22, and a part of the bar 24 is projected into the groove 23 from below. Holes 25 for the reinforcing bar are formed on the upper and lower surfaces of the base end portion of the projecting portion 22, respectively. A ridge 21a is formed in the length direction on the upper end surface of the reinforced concrete slab 21, and a long groove 21b capable of fitting with the ridge 21a is formed on the lower end surface thereof. Furthermore, on both upper and lower sides,
Reinforced plastic film 21c such as FRP is applied or adhered respectively, and when the front wall frame members 2 are stacked and joined together, slippage is improved to prevent damage and facilitate handling.
Installation accuracy is also improved. Bolt insertion holes 22a are formed in the upper and lower portions of the tip end of the protrusion 22 so as to laterally pass therethrough. The structure of the corner blocks 2b and 2c is also basically the same as that of the standard block 2a, and therefore their plan views are shown in FIGS. 5 and 6 and their description is omitted.

The connecting plate member 3 is formed in a gate shape as viewed from the front as shown in FIG. At one end of the upper end surface of the connection plate member 3,
A T-shaped groove 31 corresponding to the T-shaped groove 23 is opened, and the groove 31
A part of the streak 24 is projected inward from below. Further, the above-mentioned protrusions are provided on the upper and lower sides of one side of the connecting plate member 3.
Bolt insertion holes 32 corresponding to the bolt insertion holes 22a of 22 are formed by penetrating laterally. Bolt insertion holes 33 are also formed in the upper portion and the lower portion of the other side of the connection plate member 3 at positions corresponding to the bolt insertion holes 32, respectively. Holes 34 for handrails are formed at intermediate positions on both sides of the connection plate member 3, respectively. In addition, in the retaining wall frame 1 of FIG. 1, the connecting plate members 3 ′ located on both sides of the retaining wall frame 3 ′ are formed in a plate shape so that the concrete does not leak out when the concrete is placed. The gate-shaped connecting plate member 3 may be used on both sides of the wall frame 1 so that the opening of the connecting plate member 3 is closed with a slate plate or the like when pouring concrete.

The standard block 4a of the rear wall frame member 4 is provided with a protrusion 42 on the back surface of the reinforced concrete plate 41 as shown in FIGS. 8 and 9, and has the same shape as the standard block 2a of the front wall frame member 2. However, the reinforcing bar hole (25) and the T-shaped groove (23) are not provided. Bolt insertion holes 43 corresponding to the bolt insertion holes 33 are formed in the upper and lower portions of the tip of the protrusion 42 so as to laterally penetrate therethrough. Corner block
The structures of 4b and 4c are also basically the same as those of the standard block 4a, and therefore illustration and description thereof are omitted.

The T-shaped groove 23 of the front wall frame member 2 and the T-shaped groove 31 of the connecting plate member 3
As shown in FIGS. 10 and 11, the box nut 52 is screwed onto the screw parts 51a and 51b of the bolt 51 having the screw parts 51a and 51b with different screw directions at both ends. Insert the adjusted metal fittings 50. A fitting portion 51c of the wrench is formed in the central portion of the bolt 51. Also, for each nut 52,
A hole 52a to be fitted and inserted in the upper end portion of the bar 24 is provided. The adjustment metal fitting 50 is inserted between the front wall frame member 2 and the connecting plate member 3 in the front-back direction so that the front surfaces of the front wall frame members 2 of the respective stacked stages are flush with each other. This is for adjusting the tilted state.

To connect the front wall frame member 2 and the connecting plate member 3, and the connecting plate member 3 and the rear wall frame member 4, plate-like connecting metal pieces 60 are used as shown in FIGS. 4 and 9, respectively. This connection hardware 60
Has a bolt hole 61 at one end and a long hole for a bolt at the other end.
62 have been opened respectively.

Next, a method of constructing the retaining wall of the above-mentioned embodiment will be described with reference to the drawings.

First, in FIG. 12 (a), a retaining wall for the site B to be constructed on the right side having a height of several meters is to be constructed along the planned road C on the left side. The left side of the construction site B is excavated along the planned road site C to form a retaining wall construction site. In the figure (a), the alternate long and short dash line indicates the excavation line for constructing the retaining wall of the present invention,
The chain double-dashed line indicates the excavation line for building a conventional gravity retaining wall. As can be seen from FIG. 3A, the retaining wall of the present invention has a narrower excavation range than the conventional retaining wall because it is not necessary to assemble an external scaffold.

At the retaining wall construction site of the excavation site, foundation stones are laid and rolled, and then leveled concrete is placed thereon to form a foundation support (concrete foundation) A.

The front wall frame member 2, the connecting plate member 3, and the rear wall frame member 4 are transported to a retaining wall construction site by a truck T with a crane. Then, the front wall frame member 2 is sequentially lowered at a predetermined position on the base support A by a crane and arranged side by side (FIG. 13 (a)), and the connecting plate member 3 is sequentially lowered by a crane to front wall frame member 2 After the one end of the connecting plate member 3 is butted against the projection 22 of the same (FIG. 2 (b)), the adjustment metal fitting 50 is inserted into the T-shaped grooves 23 and 31.
(Fig. 10) is inserted, and the bolt 61 (Fig. 4) and the long hole 62 of the fitting 60 (Fig. 4) are inserted into a bolt (not shown) to attach a nut (not shown). One end of the member 3 is connected to the protrusion 22 of the front wall frame member 2. Then, the rear wall frame member 4 is sequentially lowered by a crane, and the protruding portion 42 thereof is abutted on the rear end of the connecting plate member 3 (FIG. (C)), and the connecting fitting 60
The bolt hole 61 and the long hole 62 are inserted into a bolt (not shown) and a nut (not shown) is attached to connect the projection 42 of the rear wall frame member 4 to the rear end of the connecting plate member 3. After the assembling of the first-stage retaining wall portion 1a is completed in this manner, the second-stage front wall frame member 2 is stacked on the front wall frame member 2 by a crane. At this time, a reinforcing bar (not shown) is inserted in the rebar hole 25 of the protrusion 22 of the first step.
The upper part of the is inserted so as to project, and the reinforcing bar hole 25 of the projecting portion 22 of the second stage is inserted into the projecting portion of the reinforcing bar. Further, the second stage connecting plate member 3 which is shorter than the first stage (shorter by 0.25 m) than the first stage is piled up on the connecting plate member 3 by a crane (Fig. 3 (d)). Then, as in the case of the first stage, the front wall frame member 2
After connecting the projecting portion 22 and the connecting plate member 3 of the connecting plate member 3 with the adjusting fitting 50 and the connecting fitting 60, the rear wall frame member 4 of the second stage is piled up by the crane and the projecting portion 42 is connected to the rear end of the connecting plate member 3. Butt and connect with the connecting bracket 60. Then, when the front surface of the front wall frame member 2 of the second step does not coincide with the front surface of the front wall frame member 2 of the lower step, the bolt 51 of the adjustment fitting 50 is rotated by a wrench or the like to move the front wall frame member 2 Move it back and forth to match. After the assembly of the second-stage retaining wall frame portion 1a is completed, the scaffolding plate 35 (FIG. 1) is placed on the first-stage connecting plate member 3 under the opening (window) of the second-stage connecting plate member 3. To lay. Further, a handrail pipe 36 (FIG. 1) is passed through the handrail hole 34 of the connection plate member 3 in series. Thus, the scaffolding plate 35 is mounted on the first connecting plate member 3 along the length direction of the retaining wall frame 1, and the handrail pipe 36 is mounted parallel to the scaffolding plate 35. When each of the members 2 to 4 is hoisted or unloaded by a crane, a known hanging metal fitting (not shown) is attached to the lower end of the wire of the crane, and each member 2 to 4 is clamped and fixed by the hanging metal fitting. And then work. Alternatively, a concave portion capable of locking a hook of a crane is formed in advance on the back surface of each member 2 to 4 and hooked with the hook to hook each member 2 to 4.
4 may be hung.

Hereinafter, the retaining wall portion 1a of the third stage and thereafter is assembled in the same manner as the retaining wall portion 1a of the second stage described above, and then the scaffold plate 35 and the handrail pipe 36 are attached. And the uppermost retaining wall frame
After assembling 1a, a handrail fence 26 (Fig. 1) is inserted and attached to the insertion hole 25 of the projection 22 of the front wall frame member 2.

In this way, after the retaining wall frame 1 is assembled (Figs. 12 (b) and 13 (e)), concrete is placed, but this placing work uses the scaffolding plate 35 described above. , Concrete is placed sequentially from the bottom retaining wall frame 1a. Then, after the placing of concrete into the lowermost retaining wall frame portion 1a is completed, the scaffold plate 35 (Fig. 1) and the handrail pipe 36
Is removed, and concrete is placed in the retaining wall frame portion 1a on the upper stage. If concrete is placed in the entire retaining wall frame 1, the construction of the retaining wall as a structure is completed.

After this, as shown in FIG. 12 (c), the excavated portion in front of the front wall frame member 2 is backfilled with earth and sand. In addition, a staircase-shaped rear wall frame member 4
On the side, a concrete for water stop 65 is placed at a position slightly higher than the planned road site C, and a back-filled crush stone 66 is piled up along the rear wall frame member 4 on the concrete 65, and the earth and sand are backfilled. The Urakami Kuriishi 66 is provided to collect the water in the land B and drain it from the drain pipe 67 of the retaining wall 1.
Such a drainage mechanism was also provided for the conventional retaining wall 70 (Fig. 16 (d)). However, in the conventional retaining wall 70, the concrete was placed while the pipes 74 were fixed at a predetermined interval between the front and rear molds 73, so the work for deploying the pipes 74 took time and effort. It was However, in the retaining wall of the present invention, the front wall frame member 2 and the rear wall frame member 4 have the insertion holes 68 (second
(Fig.) Are opened respectively, and the pipe 67 can be easily deployed by inserting the pipe 67 between the front and rear insertion holes 68 when assembling the retaining wall frame 1. Further, the pipe 67 needs to be tilted slightly downward from the rear wall frame member 4 side to the front wall frame member 2 side.
It is easily determined by inserting the pipe 67 between the insertion holes 68 of 4 and 4.

A flow chart of the method for constructing the retaining wall of the present invention described above is shown in Fig. 17 (a). As is clear from the figure, the work required for construction is mainly the assembly of the retaining wall frame 1 and the concrete. The work contents have been greatly simplified.
In addition, because concrete is placed in the retaining wall frame 1 assembled with preformed retaining wall members 2 to 4, the curing period is only one day, and the construction period is shortened to 7 days. Days, except for foundation work and backfill work).

14 (a) and 14 (b) show another embodiment of the retaining wall. The difference from the above embodiment is that instead of forming the connecting plate member 3 in a gate shape and straddling the scaffolding plate 35, the connecting plate member 3 ″ is formed in a plate shape to support a plurality of scaffolding plates. The hole 38 of the pipe for use is provided, and the scaffold plate 35 is laid over the pipe 38 through the pipe 39.

Figure 15 shows a curved retaining wall. In the illustrated retaining wall 1 ', the front wall frame member 2 and the rear wall frame member 4 of each step are stacked so that both ends thereof are aligned, and are refracted at a constant distance according to a curve such as a road. In the illustrated example, the rear wall frame member 4 has a length slightly shorter than that of the corresponding front wall frame member 2. However, in other configurations, it is common to the retaining wall 1 in the straight line portion, and the construction method is also the front wall frame member 2 in the retaining wall 1.
Further, since they are common except that the rear wall frame members 4 are stacked in a staggered manner and the above-mentioned differences, detailed description thereof will be omitted.

[Effects of the Invention] As is clear from the above description, the gravity type retaining wall and the construction method thereof according to the present invention have the following effects.

(1) Since the retaining wall frame that forms the exterior of the retaining wall functions as a formwork during concrete pouring, and the connecting plate member in the retaining wall frame functions as the support portion of the scaffolding board, it is different from the conventional retaining wall. Differently, it eliminates the need to assemble / disassemble the scaffold (external) and assemble / remove the formwork. For this reason, it is not necessary to have a carpenter such as a formwork carpenter, and only a normal worker can perform the construction, and the work is simple, and the construction period can be greatly shortened. Along with this, the construction cost will be considerably reduced. Further, since the connecting plate member acts as a reinforcing material in the concrete of the retaining wall, the strength of the retaining wall itself is greater than that of the conventional retaining wall, and the quality of the concrete placed in the retaining wall frame can be reduced to some extent. It becomes possible and the cost can be reduced.

(2) Workers can assemble the retaining wall frame from the top to the top of the basic support in order, and all the work can be performed within the retaining wall frame, which is safer than the conventional work using an external scaffold. It is highly likely. In addition, the work efficiency is high because it is possible to carry out work in various places according to the work procedure, including assembling the retaining wall frame and installing the drainage pipe.

(3) In the gravity type retaining wall of the present invention, since the front wall frame member has the protrusion on the back surface and can be self-supporting, if the front wall frame member is placed by a crane or the like, the front wall frame member is self-supporting in that state. However, since it is not necessary to support the worker so as not to tilt, all the work can be performed by only the worker in the retaining wall portion, and the work safety is higher than that of the external scaffold. In addition, the projecting portion of the front wall frame member and one end portion of the connecting plate member (and the projecting portion of the connecting plate member and the rear wall frame member) are provided with a bolt hole at one end and a long hole for a bolt at the other end, respectively. Since the bolts are inserted into the bolt holes and the long holes through the opened connection hardware to connect them, the mounting angle of the front wall frame member with respect to the connecting plate member can be finely adjusted.

(4) In the gravity type retaining wall according to claim 2, the upper part of the reinforcing bar is projected into the reinforcing bar hole of the first step projection part and inserted, and the reinforcing bar of the second step projection part is inserted into the protruding part of the reinforcing bar. By inserting the hole, the tilting of the front wall frame member can be prevented more reliably, and the temporary connection with the lower front wall frame member can be performed at the same time. Particularly, when the front surface of the front wall frame member above the second step does not coincide with the front surface of the front wall frame member in the lower step, the bolt of the adjustment fitting is rotated by a spanner or the like as described in claim 3. By tilting the upper portion of the front wall frame member in the front-rear direction, the front wall frame member, which is a heavy object, can be flush with the lower front wall frame member by a simple operation.

[Brief description of drawings]

FIG. 1 is a perspective view showing a completed state of assembling a retaining wall (frame) according to the first embodiment of the present invention. FIG. 2 is a plan view of the lowermost retaining wall frame part with a part omitted, FIG. 3 is a plan view showing a standard block of the front wall frame member, and FIG. 4 is IV- of FIG.
View taken along the line IV, FIGS. 5 and 6 are corner blocks of the front wall frame member, FIG. 7 is a front view in which a part of the connecting plate member according to the first embodiment is omitted, and FIG. 8 is a rear wall. The top view which shows the standard block of a frame member, FIG. 9 is the IX-IX line arrow line view of FIG.
FIG. 10 is a front view showing an adjustment fitting for connecting the front wall frame member and the connection plate member, FIG. 11 is a plan view of FIG. 10, and FIG.
(C) is a front view showing the outline of the construction start state of the retaining wall, the completed state of the retaining wall, and the final finishing state of the retaining wall, and Figs. 13 (a) to (e) show the assembling procedure of the retaining wall frame in order. It is a front view showing through. FIG. 14 (a) is a plan view showing a part of a retaining wall (frame) according to the second embodiment of the present invention, and FIG. 14 (b) is a front view thereof. FIG. 15 is a perspective view showing the appearance of a retaining wall built on a curved portion. 16 (a) to 16 (d) are front views showing a conventional gravity type retaining wall based on its construction procedure. FIG. 17 (a) is a flow chart showing the construction method of the retaining wall of the present invention, and FIG. 17 (b) is a flow chart showing the construction method of the conventional retaining wall.
1, 1 '... Retaining wall frame, 1a ... Retaining wall frame part, 2 ... Front wall frame member, 2a
... Standard block, 2b, 2c ... Corner block, 3 ... Connection plate member, 4 ... Rear wall frame member, 4a ... Standard block, 4b, 4c ... Corner block, 22, 42 ... Projection part, 35 ... Scaffolding plate, 36 ... Pipe for handrail, 50… Adjustment fitting, 60… Connecting fitting.

Claims (4)

[Claims] Claims: 1. A reinforced concrete front wall frame member, a rear wall frame member, and a plurality of connecting plate members for connecting both wall frame members, which are of a weight and size that can be transported by a truck or the like, are connected together to form a frame shape. Besides, stacking multiple stages,
By arranging them side by side in the horizontal direction as well, a stepped retaining wall frame is constructed so that the front side is flush and the rear side gradually narrows the width of the retaining wall from the lowermost stage to the uppermost stage. A gravity-type retaining wall in which concrete is cast in a wall frame, wherein the front wall frame member has a self-supporting structure in which a protrusion is provided on the back surface of the front wall frame member, and upper and lower portions of the tip of the protrusion are formed. In addition, each of the bolt insertion holes is formed by penetrating laterally, and the connecting plate member is formed in a gate shape as viewed from the front, and the bolts of the protrusion are formed on the upper and lower sides of the connecting plate member. Bolt insertion holes corresponding to the insertion holes are formed by penetrating laterally, and the rear wall frame member has a self-supporting structure in which a protrusion is provided on the back surface of the rear wall frame member. And the lower part, the bolt insertion hole corresponding to the bolt insertion hole of the connecting plate member The front wall frame member and the connecting plate member, and the connecting plate member and the rear wall frame member, respectively, have a bolt hole at one end and a long hole for a bolt at the other end. A gravity-type retaining wall, characterized in that each of the bolt insertion holes and the bolts and nuts that are inserted in series in the bolt holes or the elongated holes of the connection metal piece are connected to each other through the opened connection metal pieces. 2. A projecting strip is formed on the upper end surface of the reinforced concrete slab on the front surface of the front wall frame member in the longitudinal direction, and a long groove capable of fitting with the projecting strip is formed on the lower end surface of the projecting portion. A groove is formed on the upper surface of the tip of the connecting plate member, and a groove corresponding to the groove is formed on one end of the upper end surface of the connecting plate member, and the groove is formed on the upper and lower surfaces of the base end of the protrusion of the front wall frame member. The gravity-type retaining wall according to claim 1, wherein a hole for use is formed. 3. A threaded portion having different screw directions is provided at both ends between the groove of the front wall frame member and the groove of the connecting plate member, and a fitting portion for a spanner is formed in a central portion. In the state in which the adjustment fittings screwed with the box-shaped nuts are fitted into the threaded parts of the bolts, rotate the bolts of the adjustment fittings,
3. The gravity type retaining wall according to claim 2, wherein the front wall frame member is adjusted so as to be flush with the lower front wall frame member by separating or approaching the upper portion of the front wall frame member with respect to the connecting plate member. 4. The following procedure for constructing a gravity retaining wall using a preformed reinforced concrete self-supporting front wall frame member, self-supporting rear wall frame member and gate-shaped connecting plate member. A construction method characterized by. a) On the base support, the front wall frame member, the rear wall frame member at a predetermined distance, and the connecting plate member between them are respectively placed, and the corresponding front wall frame member and rear wall frame member are connected to each other. The members are connected to each other through connecting metal fittings, and the retaining wall frame portions of the first stage are assembled by arranging them side by side in the lateral direction as well. B) The front wall frame member of the second stage is mounted on the front wall frame member. A second-stage connecting plate member having a slightly shortened length is stacked on the connecting plate member, and a second-stage rear wall frame member is placed across the connecting plate members, and the corresponding front plate member is mounted. The wall frame member and the rear wall frame member are connected by connecting plate members via connection fittings, respectively, and the retaining wall frame portions of the second stage are assembled by sequentially arranging them in the lateral direction, c) In the above b). By repeating the work by hanging the scaffolding plate between the connecting plate members, a plurality of steps of front wall frame members Assemble a retaining wall frame by stacking a plurality of steps of rear wall frame members in a stepwise manner so that their front surfaces are flush with each other. D) Using the scaffolding board, concrete is placed in the lowermost retaining wall frame part. After placing, concrete is placed in the retaining wall frame part of each stage up to the top while removing the upper scaffolding plate, and finally concrete is placed in the entire retaining wall frame.