JP2875791B2 - Construction method of L-shaped retaining wall - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for constructing a large L-shaped retaining wall used as a retaining wall.

[0002]

2. Description of the Related Art An L-shaped retaining wall has a low earth retaining height (3 m).
In general, L-shaped retaining walls, which are precast reinforced concrete products, are produced, transported to the site, and installed.

[0003] However, when the height of the earth retaining wall is increased, the L-shaped retaining wall to be installed becomes large, so that the production at the factory becomes impossible, and even if the production is possible, the product cannot be transported. Or become impossible. For this reason, when the earth retaining height becomes high, the front wall is divided vertically and the bottom slab is divided into front and rear, and the divided blocks are connected on site with PC steel rods to integrate them. Have been. In addition, it is unavoidably constructed with cast-in-place reinforced concrete.

[0004]

In the conventional method (1) in which the front wall or the bottom plate is divided and connected with a PC steel bar at the site to be integrated, the front wall or the bottom plate is assembled into a reinforced concrete product which is the front wall or the bottom plate. It is necessary to provide a PC steel rod insertion hole and a notch for fixing the PC steel rod, which not only complicates the production but also increases the production cost. In addition, there is a problem that assembling requires a lot of work at high places, which increases the danger of construction and raises construction costs. (2) Construction using cast-in-place concrete requires construction using precast reinforced concrete products. On the other hand, problems such as a long construction period, a large labor force, and low safety of the construction remain.

[0005]

According to the present invention, an L-shaped retaining wall is divided into a bottom slab having a rib structure reinforced with ribs and a front wall, each of which is factory-produced as a precast reinforced concrete product capable of being transported. By connecting the bottom plate of the structure and the front wall with a PC steel rod at the site using a PC steel rod to construct an L-shaped retaining wall, the production cost of reinforced concrete products can be reduced and the construction cost can be reduced compared to the conventional method. The purpose is to achieve reduction, labor saving, and improvement of safety.

[0006] The invention of the present application is the invention of claim 1 and claim 3
The invention according to claim 1 is based on the invention described in the first aspect, and (A) a plurality of connecting / using vertical ribs is provided on the earth pressure side;
A precast reinforced concrete product having a nut embedded in a rising portion of the connecting / using vertical rib and a vertical through hole extending from the nut to the upper end surface in the connecting / using vertical rib is used as a bottom plate. In the position corresponding to the connection / use vertical rib provided in the plate, the same number of connection / use vertical ribs is provided from the lower end surface of the plate to the middle position of the plate, and a vertical through hole is provided in the connection / use vertical rib, and A precast reinforced concrete product with reinforcing vertical ribs provided at the intermediate position between the connecting and functioning vertical ribs and below the upper end surface of the plate and beyond the upper end of the connecting and functioning vertical ribs to the middle of the plate as the front wall (C) On the bottom plate After placing the front wall, P
A method of constructing an L-shaped retaining wall, comprising inserting a C steel rod and connecting the buried nut of the bottom slab and the upper end surface of the vertical rib for both use and connection of the front wall by introducing tension using a PC steel rod. And
According to the third aspect of the present invention, (A) a plurality of vertical ribs and horizontal ribs are formed on the earth pressure side along the connection surface between the upper end and the front wall, and (a) a nut is embedded in a rising portion of the vertical ribs; A vertical insertion hole from the nut to the connection surface is provided in the vertical rib and the horizontal rib. (B) An intermediate position between the vertical ribs and a position corresponding to a vertical rib insertion hole in the front wall described later. The bottom rib is a precast reinforced concrete product in which a vertical through hole is provided in the horizontal rib, and (B) a plurality of vertical ribs are provided on the earth pressure side and a horizontal rib is provided along a connecting surface of the bottom plate at the lower end; A nut is embedded in the vertical rib, and a vertical insertion hole from the nut to the connection surface is provided in the vertical rib and the horizontal rib. (B) An intermediate position between the vertical ribs, Precast with a vertical through hole in the horizontal rib at a position corresponding to the insertion hole in the vertical rib (C) After placing the front wall on the bottom slab with the reinforced concrete product as the front wall, insert a PC steel rod through the through hole of the horizontal rib of the front wall and the bottom slab, and bury the nut of the bottom slab and the horizontal rib of the front wall. Between the buried nut of the front wall and the lower end of the horizontal rib of the bottom slab by introducing tension with a PC steel bar between the upper end surface of the front wall and the lower end surface of the horizontal rib of the bottom plate. is there.

The invention according to claims 4 to 6 employs the embedment of unbonded PC steel bars in place of the embedment of the nut according to the inventions of claims 1 to 3, respectively, and differs in details. Although there are points, the structure of the bottom plate and front wall, PC
The outline of the connection by introducing the tension by the steel rod and the filling of the grout material are the same.

According to a seventh aspect of the present invention, in the fourth to sixth aspects of the present invention, the connection end face side of the through hole is enlarged to facilitate positioning when the front wall is mounted, and It is intended to facilitate the connection between the unbonded PC steel bar buried and the new PC steel bar.

According to the present invention, a notch is provided in a hole wall at the end of at least one connection surface of the hole on the front wall side or the bottom plate side through which the PC steel rod or the unbonded PC steel rod is inserted, and the front plate is formed on the bottom plate. When mounting the wall, the grout material injection pipe is sandwiched by the cuts, and the grout material is filled into the insertion hole and the through hole through the grout material injection pipe, and the conventional precast reinforced concrete product is used. Therefore, the burying of the grouting material injection pipe, which is indispensable, is not required, and the production cost of the precast reinforced concrete product is reduced.

In any of the inventions according to the present invention, the large L-shaped retaining wall after the construction is divided into a bottom plate and a front wall so that the weight becomes approximately half, and each is produced at a factory as a precast reinforced concrete product. The large L-shaped retaining wall is constructed by transporting to the site and using it one-on-one, connecting it by introducing tension using a PC steel bar.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of a bottom plate and a front wall used in the present invention and a construction method will be described below with reference to the drawings.

An embodiment of the present invention will be described with reference to FIGS. 1 and 4. FIG.

FIG. 1 shows the L constructed according to the first aspect of the present invention.
An example of a shape retaining wall is shown, (a) is a back (earth pressure side) view,
(B) is a side view, (c) is a plan view, (d), (e),
(F) is DD sectional drawing, EE sectional drawing, and FF sectional drawing of (a), respectively.

FIG. 4 shows a connecting portion by a PC steel bar.
(A) is a longitudinal sectional view of a main part, (b) is a longitudinal sectional view of a connecting portion between the through hole and the insertion hole, and (c) is an elevation view of a connecting portion between the through hole and the insertion hole.

The bottom plate 1 to be used is provided with a plurality of connecting / use vertical ribs 4a continuously from the horizontal portion to the rising portion on the earth pressure side at the time of manufacture, and a buried nut 11 is provided on the bottom side of the rising portion.
Are vertically buried, and a vertical insertion hole 20 extending from the buried nut 11 to the upper end face is provided in the connecting / use vertical rib 4a. On the other hand, the front wall 2 to be used is provided with a connecting / use vertical rib 4b from the lower end surface of the front wall 2 to an intermediate position of the front wall 2 at the time of manufacture. A horizontal plane is formed at an intermediate position, and a vertical through-hole 21 is provided in the connection / use vertical rib 4b. And
Another reinforcing vertical rib 5 extending downward from the upper end surface of the front wall 2 at an intermediate position in the extending direction (laying direction) between the connecting and using vertical ribs 4b.
Are provided to the middle of the front wall 2 beyond the upper end of the connection / use vertical rib 4b, and the lower part of the reinforcing vertical rib 5 and the upper part of the connection / use vertical rib 4b are located at positions where they overlap in the vertical direction.
The bottom slab 1 and the front wall 2 correspond one-to-one, have the same length in the extension direction (laying direction), and have the same number of connection / use vertical ribs 4a of the bottom slab 1 and connection / use vertical ribs 4b of the front wall 2. At the same pitch, when the front wall 2 is placed on the rising portion of the bottom plate 1, the insertion hole 20 of the bottom plate 1 and the through hole 21 of the front wall 2 communicate.

The precast reinforced concrete product, the bottom slab 1 and the front wall 2 are transported to the site, and one bottom slab 1 and one front wall 2 are paired to assemble an L-shaped retaining wall. This assembly is performed in the following manner.

(1) The bottom plate 1 is set at a predetermined position.
(2) The front wall 2 is connected to the bottom slab 1 so that the lower end surface of the connection / use vertical rib 4b of the front wall 2 rests on the upper end surface of the connection / use vertical rib 4a of the bottom slab 1.
Hang it on the At this time, as shown in FIGS. 4 (b) and 4 (c), the pressure-resistant hose 17 is connected to the bottom plate 1 and the front wall 2 so as to open into the insertion hole 20 and the through hole 21 of the connection surface 3a between the bottom plate 1 and the front wall 2. Sandwich it between. In addition, FIG.
In (c), an example is shown in which a semicircular cut is provided in the hole walls of both the insertion hole 20 and the through hole 21 to form a circular cut as a whole, and the cutout clamps the pressure-resistant hose 17 having a circular cross section. This cut is provided only in one of the hole walls of the insertion hole 20 and the through hole 21,
It is good also as a structure which does not provide a cut in the other hole wall.
The shape of the cut may be not only circular but also polygonal. In short, any structure may be used as long as the pressure-resistant hose 17 can be freely attached and detached by the cuts provided and can be firmly held between the connection surfaces 3a. (3) Connecting vertical rib 4b of front wall 2
The PC steel rod 10 is inserted through the upper end face of the PC steel rod, the lower end thereof is screwed into the buried nut 11, and the tension is applied to the PC steel rod 10, and the upper end of the PC steel rod 10 is connected to the connecting / use vertical rib 4b of the front wall 2. It is fixed to the end face by the nut 12. (See Fig. 1 (d))
(4) The grout material is filled into the insertion hole and the through hole using the pressure-resistant hose 17 as an injection tube.

In FIG. 1A, the case where the connecting surface between the bottom slab 1 and the front wall 2 is a continuous horizontal surface is indicated by 3a, and the case where the connecting surface is a horizontal surface having a step is indicated by 3b.

By this assembling operation, the bottom plate 1 and the front wall 2
And an L-shaped retaining wall is formed. This L-shaped retaining wall is made of L-shaped retaining wall or cast-in-place reinforced concrete.
It has the same strength and performance as those of the retaining wall.

When the assembly of one L-shaped retaining wall is completed, the L-shaped retaining walls are assembled one after another adjacent to the extending direction (laying direction). The connection between adjacent L-shaped retaining walls is performed by bolt connection between end joints and boxlessness as usual.

Referring to FIG. 2, an embodiment of the present invention will be described.

The invention described in claim 2 is a preferred modification of the invention described in claim 1.

FIG. 2 shows the L constructed according to the second aspect of the present invention.
An example of a shape retaining wall is shown, (a) is a back (earth pressure side) view,
(B) is a side view, (c) is a plan view, (d), (e),
(F) is DD sectional drawing, EE sectional drawing, and FF sectional drawing of (a), respectively.

The structure of the bottom plate 1 used is the same as that of the first embodiment, and the only difference is the structure of the front wall 2 used. In the case of the second aspect of the present invention, the front wall 2 having a structure in which a vertical overlapping portion of the connecting / using vertical rib 4b and another reinforcing vertical rib 5 is connected by a horizontal rib 6 is used. The bottom slab 1 and the front wall 2 correspond one-to-one and have the same length in the extension direction (laying direction).
The same number and the same pitch of a and the connecting / use vertical ribs 4b of the front wall 2 are all the same as in the case of the first aspect of the invention, and the assembling method is also the same as that of the first aspect of the invention. is there.

An embodiment of the third aspect of the present invention will be described with reference to FIG.

FIG. 3 shows the L constructed according to the third aspect of the present invention.
An example of a shape retaining wall is shown, (a) is a back (earth pressure side) view,
(B) is a side view, (c) is a plan view, (d), (e),
(F) is DD sectional drawing, EE sectional drawing, and FF sectional drawing of (a), respectively.

The bottom plate 1 used is provided with a plurality of vertical ribs 4 on the earth pressure side from the horizontal portion to the rising portion at the time of manufacture, and the horizontal ribs 7a are formed along the connecting surface with the front wall 2 at the upper end. A buried nut 11 is buried in a rising portion of the vertical rib 4, and a vertical insertion hole is provided from the buried nut 11 to a connection surface at an upper end, and a horizontal rib 7 a at an intermediate position between the vertical ribs 4 is provided. Are provided with vertical through holes. on the other hand,
In manufacturing, the front wall 2 used is provided with a plurality of vertical ribs 5 on the earth pressure side, a horizontal rib 7b is provided along a connection surface with the bottom plate 1 at the lower end, and an embedded nut 11 is embedded in the vertical rib 5. Are embedded, and a vertical insertion hole is provided from the embedded nut 11 to the connection surface at the lower end, and a vertical through hole is provided in a horizontal rib 7 b at an intermediate position between the vertical ribs 5.

The bottom slab 1 and the front wall 2 correspond one to one and have the same length in the extension direction (laying direction). When the front wall 2 is placed on the rising portion of the bottom slab 1, the vertical ribs 4 The inner hole and the through hole in the horizontal rib 7b of the front wall 2 communicate with each other, and the through hole in the horizontal rib 7a of the bottom slab 1 communicates with the insertion hole in the vertical rib 5 of the front wall 2.

The bottom slab 1 and the front wall 2 are transported to the site, and an L-shaped retaining wall is assembled with one bottom slab 1 and one front wall 1 as a pair. This assembly is performed in the following manner.

(1) The bottom plate 1 is set at a predetermined position.
(2) Hang the front wall 2 on the bottom slab 1 while positioning it. At this time, as shown in FIGS. 4B and 4C, the pressure-resistant hose 17 is connected between the bottom plate 1 and the front wall 2 so as to open into the insertion hole and the through hole of the connection surface 3a between the bottom plate 1 and the front wall 2. Put it in between. (3) The PC steel rod 10 is inserted through the through hole at the upper end surface of the lateral rib 7b of the front wall 2, and the lower end is screwed into the buried nut 11 on the bottom slab 1 side to introduce tension into the PC steel rod 10. In this state, the upper end is fixed to the upper end surface of the lateral rib 7b of the front wall 2 by the nut 12. (See FIG. 3D). (4) A PC steel rod 10 is inserted through a through hole in the lower end surface of the horizontal rib 7a of the bottom slab 1 and its upper end is screwed into the buried nut 11 on the front wall 2 side.
With the tension applied to the PC steel bar 10, the lower end is fixed to the lower end surface of the horizontal rib 7 a of the bottom plate 1 by the nut 12.
(See FIG. 3 (f)). The order of (3) and (4) may be reversed or they may be performed alternately. (5) The grout material is filled into the insertion hole and the through hole using the pressure-resistant hose 17 as an injection tube.

In FIG. 3A, the case where the connecting surface between the bottom slab 1 and the front wall 2 is a continuous horizontal surface is indicated by 3a, and the case where the connecting surface is a horizontal surface having a step is indicated by 3b.

When the assembly of one L-shaped retaining wall is completed, the L-shaped retaining walls are assembled one after another adjacent to the extending direction (laying direction) of the L-shaped retaining wall as in the case of the first aspect of the present invention.

The invention according to claims 4 to 6 employs the embedding of an unbonded PC steel rod in place of the embedding of the nut according to the invention according to claims 1 to 3, respectively.
Since the structure of the bottom plate and the front wall, the connection by introducing the tension by the PC steel bar, the filling of the grout material, etc. are the same,
The differences between the details will be described with reference to FIGS. 5 and 6, and an embodiment of the invention described in claim 7 which is specific to the invention described in claims 4 to 6 will be described.

FIGS. 5A and 5B show a connecting portion of the bottom plate and the front wall by a PC steel bar, wherein FIG. 5A is a longitudinal sectional view of a main part, and FIG. 5B is a longitudinal section of a connecting portion between an unbonded PC steel bar and a PC steel bar. FIG. 2C is an elevation view of a connection portion between the unbonded PC steel bar and the PC steel bar.

FIG. 6 is a longitudinal sectional view of a main part showing various methods of connecting the bottom plate and the front wall by a PC steel bar.

The sole plate 1 used in the fourth aspect of the present invention has the same structure as the sole plate 1 used in the first aspect of the present invention, but instead of burying the burying nut 11 and forming the insertion hole, an unbonded PC is used. The only difference is that the steel bar 13 is buried vertically in the connection / use vertical rib at the rising portion of the bottom plate 1. The front wall 2 has the same structure as the front wall 2 used in the first aspect of the present invention, and has a shape in which the lower end of the through hole is enlarged.

The assembly when assembling the L-shaped retaining wall with the bottom plate 1 and the front wall 2 having this structure as a pair is performed by the following method.

(1) The bottom plate 1 is set at a predetermined position.
(2) Unbonded PC steel bar 13 embedded in bottom plate 1
The coupler 16 is screwed into the upper end of the. The screwing position of the coupler 16 at this time is as shown in FIG.
May be a height protruding from the upper end surface of the bottom plate 1,
As shown in FIG. 6B, the height of the coupler 16 may be stored in the cut in the upper end surface of the bottom plate 1. When the coupler 16 is housed in a cut in the upper end surface of the bottom plate 1, the PC steel rod 14 is screwed to the upper end of the coupler 16. The PC steel bar 14 may be screwed to the upper end of the coupler 16 even when the coupler 16 projects from the upper end surface of the bottom plate 1. (3) The front wall 2 is hung down on the bottom plate 1 by using the coupler 16 and / or the PC steel bar 14 projecting from the upper end surface of the bottom plate 1 and the lower end enlarged portion of the through hole 21 of the front wall 2 as a guide. Place on top of. At this time, as shown in FIGS. 5B and 5C, the pressure-resistant hose 17 is connected between the bottom plate 1 and the front wall 2 so as to open to the sheath and the through hole 21 of the connection surface 3 a between the bottom plate 1 and the front wall 2. Put it in between. (4) When the PC steel rod 14 is not screwed into the upper end of the coupler 16, the PC steel rod 14 is inserted into the through hole 21 from above.
And the lower end thereof is screwed to the upper end of the coupler 16. In a state where tension is applied to the unbonded PC steel bars 13 and the PC steel bars 14, the upper ends thereof are fixed to the upper end surfaces of the connection / use vertical ribs of the front wall 2 by the nuts 15. (5) The grout material is filled into the sheath and the through hole 21 using the pressure-resistant hose 17 as an injection tube.

The fifth aspect of the present invention uses the same bottom plate 1 and front wall 2 as the bottom plate 1 and the front wall 2 used in the second aspect of the invention, and is the same as the fourth aspect of the present invention. Assemble a large L-shaped retaining wall by operation.

According to the sixth aspect of the invention, a bottom plate 1 and a front wall 2 having the same structure as the bottom plate 1 and the front wall 2 used in the third aspect of the invention are used. In the invention according to claim 6, the unbonded PC steel rod 13 is embedded not only in the bottom plate 1 but also in the vertical rib of the front wall 2. The unbonded PC steel rod 13 buried in the vertical rib of the front wall 2 is operated in the same manner as in the invention of claim 4 as shown in FIGS. 6 (c) and 6 (d).
The lower end is connected to the PC steel bar 14 by the coupler 16, and the lower end of the PC steel bar 14 is fixed to the lower end surface of the horizontal rib of the bottom plate 1 by the nut 15. And bottom plate 1
The through hole in the horizontal rib has a shape whose upper end is enlarged.

[0041]

According to the construction method of the present invention, the following effects can be obtained.

(1) A large L-shaped retaining wall can be constructed without reducing the proof stress by connecting the divided bottom plate and the front wall with a rib structure and providing a through hole or an insertion hole in these ribs and connecting them. . Each of the divided blocks has a simple structure, reduces manufacturing costs, is easy to assemble, and reduces construction costs. In addition, most of the assembling work is performed in low places, and work in high places is reduced, so that safety is improved.

(2) Compared to the conventional construction using cast-in-place concrete, the advantages of prefabrication can be utilized, work at high places can be drastically reduced, safety can be greatly improved, and construction costs can be significantly reduced. .

[Brief description of the drawings]

FIG. 1 shows an L-shaped retaining wall constructed according to the invention of claim 1.
An example is shown, (a) is a rear (earth pressure side) view, (b) is a side view, (c) is a plan view, (d), (e), and (f) are DD of (a), respectively. It is sectional drawing, EE sectional drawing, FF sectional drawing.

FIG. 2 shows an L-shaped retaining wall constructed according to the second aspect of the present invention.
An example is shown, (a) is a rear (earth pressure side) view, (b) is a side view, (c) is a plan view, (d), (e), and (f) are DD of (a), respectively. It is sectional drawing, EE sectional drawing, FF sectional drawing.

FIG. 3 shows an L-shaped retaining wall constructed according to the third aspect of the present invention.
An example is shown, (a) is a rear (earth pressure side) view, (b) is a side view, (c) is a plan view, (d), (e), and (f) are DD of (a), respectively. It is sectional drawing, EE sectional drawing, FF sectional drawing.

4A and 4B show a connecting portion formed by a PC steel bar, wherein FIG. 4A is a longitudinal sectional view of a main part, FIG. 4B is a longitudinal sectional view of a connecting portion between a through hole and an insertion hole, and FIG. FIG. 4 is an elevation view of a connection portion between the first and second embodiments.

FIG. 5 shows a connection part of a bottom plate and a front wall by a PC steel rod,
(A) is a longitudinal sectional view of a main part, (b) is a longitudinal sectional view of a connecting portion between an unbonded PC steel bar and a PC steel bar, and (c) is an unbonded P steel bar.
It is an elevation view of the connection part of C steel bar and PC steel bar.

FIG. 6 is a vertical sectional view of a main part showing various types of connection of the bottom plate and the front wall by a PC steel rod.

[Explanation of symbols]

1. Bottom plate, 2. Front wall, 3a, 3b, Connection surface, 4.
・ Bottom plate side vertical ribs, 4a, 4b ・ ・ Connection and vertical ribs, 5 ・
· Front wall side vertical ribs, 6 · · horizontal ribs, 7a, 7b · · · horizontal ribs, 10 · · · PC steel bars, 11 · · · embedded nuts, 12 · · ·
Tightening nut, 13 ... Unbonded PC steel rod, 14 ...
PC steel rod, 15 ... tightening nut, 16 ... coupler, 17 ... pressure-resistant hose, 20 ... insertion hole, 21 ... through hole.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-50-82804 (JP, A) JP-A-9-296462 (JP, A) Japanese Utility Model 3-12940 (JP, U) Japanese Utility Model Utility Model No. 3- 58340 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) E02D 29/02 305

Claims (8)

(57) [Claims] (A) A plurality of connection / use vertical ribs are provided on the earth pressure side, a nut is buried in a rising portion of the connection / use vertical rib, and a vertical direction extending from the nut to an upper end surface in the connection / use vertical rib. (B) On the earth pressure side, the same number of connecting / using vertical ribs is provided at the position corresponding to the connecting / using vertical ribs provided on the bottom plate from the lower end surface of the plate to the middle position of the plate. A vertical through hole is provided in the connection / combination vertical rib, and at a middle position between the connection / combination vertical ribs, from the upper end surface of the plate downward to the middle position of the plate over the upper end of the connection / combination vertical rib. (C) After placing the front wall on the bottom slab using a precast reinforced concrete product provided with vertical ribs for reinforcement, insert a PC steel rod through the through-hole of the vertical rib connected to the front wall, and bury the nuts in the bottom slab. Upper surface of the vertical rib for combined use with the front wall Characterized in that a tension is introduced by connecting a PC steel bar between the two walls to connect them. 2. The L-shaped retaining wall according to claim 1, wherein a vertical overlapping portion of the connecting vertical rib and the reinforcing vertical rib of the front wall is connected by a horizontal rib in a horizontal direction. How to build. (A) A plurality of vertical ribs are provided on the earth pressure side and horizontal ribs are formed along the connection surface between the upper end and the front wall. (A) Nuts are embedded in the rising portions of the vertical ribs. And a vertical insertion hole from the nut to the connection surface is provided in the horizontal rib. (B) The horizontal position at an intermediate position between the vertical ribs and corresponding to a vertical rib insertion hole in the front wall described later. A precast reinforced concrete product having ribs provided with vertical through holes is used as a bottom slab. (B) A plurality of vertical ribs and horizontal ribs are provided on the earth pressure side along a connection surface between the bottom slab and (a) the vertical ribs. A vertical insertion hole from the nut to the connection surface is provided in the vertical rib and the horizontal rib, and (b) an intermediate position between the vertical ribs, and in the vertical rib of the bottom plate. Precast reinforced concrete in which a vertical through hole is provided in the lateral rib at a position corresponding to the insertion hole (C) After placing the front wall on the bottom slab, insert a PC steel rod through the through-holes of the horizontal ribs of the front wall and the bottom slab. A method of constructing an L-shaped retaining wall, wherein a tension is introduced between a buried nut of a front wall and a lower end surface of a lateral rib of a bottom slab by introducing tension between the buried nut of the front wall and a bottom rib of the bottom plate. (A) A plurality of connecting / using vertical ribs are provided on the earth pressure side, and an unbonded PC is provided at a rising portion of the connecting / using vertical ribs.
A precast reinforced concrete product in which a steel bar is buried vertically and the upper end of the unbonded PC steel bar is exposed at the upper end surface is used as a bottom plate. Is provided from the lower end surface of the plate to the middle position of the plate, a vertical through hole is provided in the connection / use vertical rib, and an intermediate position between the connection / use vertical ribs from the upper end surface of the plate. The front wall is made of a precast reinforced concrete product with a reinforcing vertical rib provided to the middle of the plate beyond the upper end of the connecting / combining vertical rib below. (C) A coupler is screwed into the upper end of an unbonded PC steel bar and a front wall is formed on the bottom plate. On which a PC is placed and is inserted into the through hole of the vertical rib for both use and connection on the front wall
By screwing a steel rod into the coupler, unbonded P
A method for constructing an L-shaped retaining wall, characterized in that a connection between a fixing portion of a C steel bar and an upper end surface of a longitudinal rib for both use and connection of a front wall is performed by introducing tension by a PC steel bar. 5. An L-shaped retaining wall according to claim 4, wherein a vertical overlapping portion of the connecting vertical rib and the reinforcing vertical rib of the front wall is connected by a horizontal rib in a horizontal direction. How to build. 6. (A) A plurality of vertical ribs are provided on the earth pressure side and horizontal ribs are formed along the connection surface between the upper end and the front wall. (A) Unbonded PC steel bars are vertically embedded in the rising portions of the vertical ribs. (B) exposing the upper end of the unbonded PC steel bar to the connecting surface; and (b) the horizontal position at an intermediate position between the vertical ribs and a position corresponding to the exposed end of the unbonded PC steel bar embedded in the front wall described later. A precast reinforced concrete product in which a vertical through hole is provided in a rib is used as a bottom plate. (B) A plurality of vertical ribs and horizontal ribs are provided on the earth pressure side along a connection surface between a bottom plate and a bottom plate. An unbonded PC steel rod is embedded vertically, and the lower end of the unbonded PC steel rod is exposed to the connecting surface. (B) An exposed end of the unbonded PC steel rod embedded in the bottom plate at an intermediate position between the vertical ribs. A vertical through hole is provided in the lateral rib at a position corresponding to (C) A coupler is screwed onto the exposed end of the unbonded PC steel bar, and the front wall is placed on the bottom slab, and the PC steel bar inserted through the through holes in the ribs of the front wall and the bottom slab is used. An L-shaped retaining wall, which is screwed to a coupler to connect the fixing portion of the unbonded PC steel bar to the end surface of the front wall and the lateral rib of the bottom plate by introducing tension from the PC steel bar. How to build. 7. The method for constructing an L-shaped retaining wall according to claim 4, wherein the connecting end face side of the through hole is enlarged. 8. A notch is provided in a hole wall at an end of at least one connection surface of a hole on a front wall side or a bottom plate side through which a PC steel rod or an unbonded PC steel rod is inserted, and when the front wall is placed on the bottom plate. Grout material injection tube is clamped by the cut,
The grout material is filled into the insertion hole and the through hole through the grout material injection pipe.
The method for constructing the L-shaped retaining wall according to the above description.