Retaining wall, and construction method of retaining wall

Abstract

To provide a retaining wall capable of draining rainwater on a paved surface from an inside of a superstructure directly into a valley, and a construction method of a retaining wall capable of draining rainwater flowing into a construction space into a valley as needed.SOLUTION: A retaining wall 1 comprises: a foundation structure 10 installed on a front of a slope A; a wall surface material 20 erected vertically on the foundation structure 10; an embankment material 30 filled between the slope A and the wall surface material 20; a drainage pipe 40 extending within the embankment material 30 from the vicinity of the slope A to a front side of the wall surface material 20 and branching upward in the middle to be connected to an inside of an upper structure 50; and the upper structure 50 installed on the embankment material 30. A construction method of a retaining wall comprises foundation step S1, pipe installation step S2, wall surface step S3, and banking step S4, and is characterized in that, after the pipe installation step S2, the wall surface step S3 and the banking step S4 are performed a predetermined number of times.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a retaining wall and a construction method for a retaining wall, and more particularly to a retaining wall capable of draining rainwater from a paved surface directly from within a superstructure into a valley, and a construction method for a retaining wall capable of draining rainwater flowing into a construction space into the valley as needed. [Background technology]

[0002] A retaining wall is a structure that covers the front of a slope with wall panels and embankment materials, and is installed to prevent the slope from collapsing due to earth pressure. The construction method of a retaining wall involves spreading a drainage sheet on the slope and spraying mortar on it, pouring foundation concrete on the front of the slope, erecting wall panels on the foundation concrete, installing drainage pipes on the foundation concrete from the front of the slope to the front of the wall panels, filling the space between the wall panels and the slope with embankment material, and repeating the installation of the wall panels and filling of the embankment material from the lower level to the upper level (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2007-291707 A Summary of the Invention [Problem to be solved by the invention]

[0004] During the construction of the retaining wall, the construction space between the slope and the wall panel is exposed to the outside air. Therefore, if heavy rain or a typhoon occurs during the suspension of construction, a large amount of rainwater or groundwater will flow into the construction space from the slope on the mountain side. If the water level in the construction space rises or the force of the inflowing water becomes strong, the water pressure may cause the wall panel to protrude into the valley, and in some cases, it may even tip over into the valley. In addition, when a superstructure such as a paved road is built on top of a retaining wall, rainwater that falls on the paved surface and groundwater that seeps out from the mountain slope are collected in a drainage ditch on the valley side of the superstructure and discharged into the valley through drainage holes connected to the drainage ditch. In this way, since all the water on the paved surface is collected in the valley side and then discharged, the drainage efficiency is poor and there is a risk of the road surface being flooded in the event of heavy rain or typhoons.

[0005] An object of the present invention is to provide a retaining wall and a method for constructing a retaining wall that solves the problems of the conventional technology as described above. [Means for solving the problem]

[0006] The retaining wall of the present invention comprises a foundation structure installed on the front of the slope, a wall material erected vertically on the foundation structure, an embankment material filled between the slope and the wall material, a drainage pipe extending within the embankment material from near the slope to the front side of the wall material and branching upward at the middle, and a superstructure installed on the embankment material, and is characterized in that the upper end of the drainage pipe is connected into the superstructure, so that water that seeps into the superstructure can be drained via the drainage pipe to the front side of the wall material.

[0007] The retaining wall construction method of the present invention comprises a foundation process for installing a foundation structure on the front surface of the slope; a piping installation process for arranging, near the foundation structure, a drainage pipe that extends from near the slope to the front surface of the wall material and branches upward at the middle; a wall process for stacking multiple tiers of wall material from lower to upper on the foundation structure to define a construction space between the wall material and the slope; and a banking process for filling the construction space with banking material, wherein after the piping installation process, the wall process and the banking process are carried out a predetermined number of times, and the method is characterized in that water that infiltrates into the construction space during the construction process can be discharged outside the construction space via the drainage pipe.

[0008] The retaining wall construction method of the present invention includes an upper process of installing a superstructure on top of the embankment material and connecting the upper end of a drainage pipe into the superstructure, and may be configured so that after the retaining wall is put into service, water that infiltrates into the superstructure can be discharged outside the construction space via the drainage pipe.

[0009] The retaining wall construction method of the present invention may further include a pipe connecting step of extending the drainage pipe in the vertical direction after the pipe installation step. Effect of the Invention

[0010] The construction method of the retaining wall of the present invention is to extend a vertical pipe into the construction space behind the wall material, so that rainwater flowing into the construction space can be drained to the valley side as needed. This makes it possible to prevent the wall material from protruding or falling over due to water pressure. The retaining wall of the present invention can drain rainwater that falls on the pavement surface and groundwater that seeps from the mountain slope directly into the valley through vertical pipes in the superstructure. This makes it highly efficient at draining water and prevents flooding of the road surface due to heavy rains, typhoons, etc. [Brief description of the drawings]

[0011] [Figure 1] Illustration of the construction method of retaining walls [Diagram 2] Illustration of a retaining wall [Diagram 3] Wall material and drainage piping diagram [Figure 4A] Diagram of basic process [Figure 4B] Diagram of the piping installation process [Figure 4C] Illustration of the wall process [Figure 4D] Explanation of the embankment process [Figure 4E] Diagram of the piping connection process [Figure 4F] Drainage function diagram [Figure 4G] Explanation of the upper process DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The retaining wall and the method for constructing the retaining wall of the present invention will be described in detail below with reference to the drawings. EXAMPLES

[0013] [Construction method of retaining walls] <1> Overall configuration (Figure 1) The retaining wall construction method is a construction method in which a retaining wall 1 is constructed on the front side of a slope A. The construction method of the retaining wall includes at least a foundation process S1, a pipe installation process S2, a wall surface process S3, and a banking process S4, and after the pipe installation process S2, the wall surface process S3 and the banking process S4 are performed a predetermined number of times. In this example, the construction method further includes a pipe connection process S5 and an upper part process S6. One feature of the retaining wall construction method is that it is configured to enable water that infiltrates into the construction space B during the construction process to be drained out of the construction space B via piping.

[0014] <2> Retaining wall (Figure 2) The retaining wall 1 is a civil engineering structure installed in front of the slope A. The retaining wall 1 comprises at least a foundation structure 10, a wall material 20, a banking material 30, a drainage pipe 40, and a superstructure 50. In this example, a drainage sheet 60 is further provided. The foundation structure 10 is placed on the front side of the slope A. The wall material 20 is erected on the foundation structure 10. Between the wall material 20 and the slope A, a construction space B is defined. The embankment material 30 is filled into the construction space B between the slope A and the wall material 20. The drainage pipe 40 extends horizontally within the embankment material 30 from near the slope A to the front surface of the wall material 20, and branches vertically upward in the middle. The superstructure 50 is placed on top of the embankment material 30. The drainage sheet 60 is stretched over the slope A. Mortar is sprayed onto the slope A, covering it together with the drainage sheet 60. One feature of the retaining wall 1 is that it is structured so that rainwater and groundwater that infiltrates onto the superstructure 50 can be drained to the front side of the wall material 20 via drainage piping 40.

[0015] <2.1> Foundation structure (Fig. 3) The foundation structure 10 is a structure that supports the retaining wall 1 on the slope A. In this example, the foundation structure 10 comprises a plurality of foundation panels 11 erected on the front bottom surface of the slope A, leveling concrete 12 poured on the bottom surface of the slope A, and backfill concrete 13 used to backfill the floor panels 11b of the foundation panels 11. The foundation panel 11 is a panel made of precast concrete and has a connecting protrusion 11a on the back for connecting to a wall panel 21 to be installed above, and a floor plate 11b for installation on the leveled concrete 12, with drainage holes 11c penetrating both sides. The multiple foundation panels 11 are arranged in parallel in the width direction along the bottom surface of the slope A.

[0016] <2.2> Wall material (Fig. 3) The wall material 20 is a member that constitutes the wall surface of the retaining wall 1 . In this example, the wall material 20 comprises a plurality of wall panels 21 erected on a foundation panel 11, connecting materials 22 connecting the upper and lower wall panels 21, and supporting materials (not shown) for fixing the wall panels 21 to the back surfaces of the wall panels 21. The wall panel 21 is a panel made of precast concrete, and has a connecting protrusion 21a on the back surface for connecting to the wall panels 21 above and below. The multiple wall panels 21 are arranged in parallel in multiple stages on top of the foundation panel 11.

[0017] <2.3> Embankment materials The filling material 30 is a member for backfilling the construction space B. In this embodiment, air mortar, which is made lighter by mixing a foaming agent into mortar, is used as the banking material 30. In addition, air milk, which is made by mixing a foaming agent into cement milk, mortar, concrete, etc. may be used.

[0018] <2.4> Drainage piping (Fig. 3) The drainage pipe 40 is a pipe arranged within the embankment material 30. In this example, the drainage piping 40 is a combination of a number of horizontal pipes 41, a number of vertical pipes 42, a branch pipe 43 that connects the horizontal pipes 41 to the vertical pipes 42, and a connecting pipe 44 that connects the horizontal pipes 41 and the vertical pipes 42 in the longitudinal direction. In this example, polyvinyl chloride pipes are used as the horizontal pipe 41 and the vertical pipe 42. The horizontal pipe 41 is located within the embankment material 30, with its base end close to the slope A and its tip connected to the drainage hole 11c of the foundation panel 11 or the wall panel 21, and drains groundwater and the like flowing down along the slope A to the front of the wall material 20. The vertical pipe 42 extends from the branch pipe 43 into the superstructure 50 within the embankment material 30, and drains rainwater and other water that seeps into the superstructure 50 to the front of the wall material 20 via the horizontal pipe 41. In the horizontal pipe 41 and the vertical pipe 42, "horizontal" and "vertical" mean approximately "horizontal direction" and "vertical direction" and include a slight inclination. For example, the horizontal pipe 41 may be inclined slightly downward from the base end to the tip end.

[0019] <2.5>Superstructure The superstructure 50 is a structure that constitutes the upper part of the retaining wall 1. The superstructure 50 is placed on top of the embankment material 30. In this example, a combination of a roadbed 51 installed on the embankment material 30, a roadbed 52 laid on the roadbed 51, and an asphalt surface layer (not shown) is used as the superstructure 50. The upper end of a vertical pipe 42 is connected to the inside of the roadbed 51. The specific configuration of the superstructure 50 is well known in the art as a paved road structure and will not be described in detail here.

[0020] <3> Basic process (Figure 4A) The foundation process S1 is a process of constructing the foundation structure 10 of the retaining wall 1. Prior to the foundation process S1, a plurality of drainage sheets 60 are laid along the inclination direction of the slope A, and mortar is sprayed onto the slope A in a constant thickness. The foundation process S1 is carried out, for example, as follows. Crushed stones (not shown) are laid on the ground in front of the slope A and are compacted, and then the leveling concrete 12 is poured. Anchor bolts are embedded in the leveling concrete 12. The foundation panels 11 are arranged in parallel on the leveled concrete 12, and the heads of the anchor bolts are inserted into the bolt holes in the floor plate 11b and bolted together. Return concrete 13 is poured between the slope A and the foundation panel 11 to backfill the floor plate 11b.

[0021] <4> Piping installation process (Figure 4B) The piping installation step S2 is a step of installing the drainage piping 40. The piping installation step S2 is performed, for example, as follows. A plurality of drainage pipes 40 are arranged in parallel on the hardened return concrete 13 from the slope A to the foundation panel 11. In detail, the tip side horizontal pipe 41 is connected to the drain hole 11c of the foundation panel 11, and the base side horizontal pipe 41 is placed on the slope A side, and both are connected by a branch pipe 43. The branch end of the branch pipe 43 is directed upward, and the vertical pipe 42 is erected.

[0022] <5> Wall process (Figure 4C) The wall surface process S3 is a process of erecting the wall material 20 on the front surface of the slope A. The wall surface process S3 is carried out, for example, as follows. The wall panel 21 is hung on top of the foundation panel 11, and connecting material 22 is passed vertically through the insertion holes of the connecting protrusions 11a of the foundation panel 11 and the insertion holes of the connecting protrusions 21a of the wall panel 21 and fastened with bolts. Next, the upper wall panel 21 is hung on top of the lower wall panel 21, and the connecting protrusions 21a are connected with connecting members 22 and fastened with bolts. The same process is repeated a predetermined number of times to construct the wall material 20. The wall surface process S3 defines a construction space B between the rear surface of the wall material 20 and the front surface of the slope A.

[0023] <6> Embankment process (Fig. 4D) The filling step S4 is a step of filling the construction space B with the filling material 30. The filling step S4 is carried out, for example, as follows. The embankment material 30 is pumped into the pouring hose and poured into the construction space B. It is desirable that the height of the embankment material 30 poured in one go be approximately 1 m or less.

[0024] <7> Pipe connection process (Figure 4E) The piping connection step S5 is a step of extending the vertical pipe 42 upward. The piping connection step S5 is performed, for example, as follows. A connecting pipe 44 is connected to the head of the vertical pipe 42 erected from the branch pipe 43, and the vertical pipe 42 is extended upward. This work is appropriately performed according to the level of the construction surface of the embankment material 30 in the embankment process S4. If the height from the branch pipe 43 to the superstructure 50 is up to about 2 m, the vertical pipe 42 need not be extended, and a single vertical pipe 42 can be used. In this case, the piping connection step S5 is not performed.

[0025] <7.1> Drainage function during construction (Fig. 4F) In the case of a typhoon or heavy rain occurring during the construction of the wall surface process S3 and the embankment process S4, in the construction method of the conventional technology, rainwater would accumulate in the construction space B, causing water pressure to be applied to the wall material 20, which could cause it to bulge outward or collapse. In the present invention, even during construction, rainwater can be taken into the vertical pipe 42 and discharged through the drainage hole 11c via the horizontal pipe 41 to the front side of the wall material 20. This makes it possible to prevent water pressure from being generated by rainwater on the wall material 20. During long periods of suspension of construction or when heavy rain or typhoons are predicted, the vertical pipe 42 can be cut in advance at the construction surface level of the embankment material 30, or the connecting pipe 44 can be removed and adjusted to the construction surface level, to prepare for the inflow of rainwater. The cut vertical pipe 42 can be easily reconnected using the connecting pipe 44.

[0026] <8> Upper process (Figure 4G) The upper process S6 is a process of constructing the upper structure 50 of the retaining wall 1. The upper process S6 is carried out, for example, as follows. A 10 cm thick layer of sealing concrete (not shown) is poured onto the final pouring surface of the embankment material 30. After the seal concrete has hardened, the roadbed 51 is spread on the seal concrete and compacted. At this time, the upper end of the vertical pipe 42 is buried in the roadbed 51. The upper end of the vertical pipe 42 is covered with a wire mesh or the like. A roadbed 52 is laid on the roadbed 51 and compacted, and an asphalt surface layer is placed on the roadbed 52. The superstructure 50 of the present invention can drain rainwater that seeps into the roadbed 51 from the asphalt surface layer to the front side of the wall material 20 via the vertical pipe 42. [Explanation of symbols]

[0027] 1. Retaining walls 10 Basic structure 11 Basic Panel 11a Connecting protrusion 11b Floorboard 11c Drain hole 12 Leveling concrete 13 Return concrete 20 Wall Materials 21 Wall Panel 21a Connecting protrusion 22 Connecting material 30 Embankment materials 40 Drainage piping 41 Horizontal Pipe 42 Branch pipe 43 Vertical Pipe 44 Connecting Pipe 50 Superstructure 51 Roadbed 52 Roadbed 60 Drainage Sheet A Slope B Construction space S1 Basic process S2 Piping installation process S3 Wall surface process S4 Embankment process S5 Piping connection process S6 Upper process

Claims

1. The foundation structure installed on the front of the slope, A wall material vertically erected on the foundation structure; An embankment material filled between the slope and the wall material; A drainage pipe extending from the vicinity of the slope to the front side of the wall material in the embankment material and branching upward at an intermediate portion; and a superstructure installed on the embankment material; The upper end of the drainage pipe is connected to the upper structure, so that water that has entered the upper structure can be discharged to the front side of the wall material through the drainage pipe. Retaining wall.

2. A method for constructing a retaining wall on a front surface of a slope, comprising the steps of: A foundation process of installing a foundation structure on the front surface of the slope; A piping installation process for arranging a drainage pipe near the foundation structure, the drainage pipe extending from near the slope to a front side of the wall material described later and branching upward at an intermediate portion; A wall surface process of stacking a plurality of wall surfaces from the lower stage to the upper stage on the foundation structure to define a construction space between the wall surfaces and the slope; A filling step of filling the construction space with a filling material, After the piping installation step, the wall surface step and the banking step are performed a predetermined number of times; The present invention is characterized in that, during the construction process, water that enters the construction space can be discharged to the outside of the construction space through the drainage pipe. How to construct a retaining wall.

3. and an upper step of installing a superstructure on the embankment material and connecting an upper end of the drainage pipe into the superstructure. The retaining wall is characterized in that, after the retaining wall is put into service, water that has entered the upper structure can be discharged to the outside of the construction space through the drainage pipe. A method for constructing a retaining wall according to claim 2.

4. The method further includes a piping connection step of extending the drainage piping vertically after the piping installation step. A method for constructing a retaining wall according to claim 2 or 3.

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