JP6940709B1 - Retaining wall and its construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To construct a building on a site easily in a short period of time without reducing the flat land for constructing a building as much as possible, and to support the horizontal component of earth pressure reliably and for a long period of time. The purpose is to provide a possible retaining wall and its construction method. SOLUTION: A retaining wall has a plurality of support piles each having a columnar portion formed by cement milk in the ground and an H-shaped steel 6 having a lower portion arranged inside the columnar portion and an upper portion exposed from the columnar portion. 2. A shaped steel having a web, a first flange formed on one end side of the web, and a second flange formed on the other end side of the web. Is formed by a connecting member 3 fixed to the H-shaped steel 6 of the supporting pile 2 and reinforced concrete, arranged along the H-shaped steel 6 of the plurality of supporting piles, and supported via the connecting member 3 embedded inside. It is fixed to the pile 2 and includes a wall member 4 that receives a horizontal component of soil pressure. [Selection diagram] Fig. 4

Description

The present invention relates to a retaining wall and a method for constructing the retaining wall.

The retaining wall is a structure that prevents the collapse of the land by receiving the earth pressure of the land with different heights such as cut and embankment. Inverted L-shaped cantilever retaining walls are known.

Further, as shown in Patent Document 1 below, a precast (PCa) concrete panel is anchored or pulled bolts to the main piles (support piles) of a plurality of H-shaped steel piles driven at predetermined intervals on the retaining wall. Some have a structure supported by a metal connecting member such as.

Japanese Unexamined Patent Publication No. 2009-162029

Masonry retaining walls and cantilever retaining walls, which are conventional construction methods, require a long construction period and cost, and have the following problems. That is, since the masonry retaining wall needs to have a slope of 65 ° or less with respect to the horizontal plane, the amount of flat land that can be secured is reduced as compared with the case where the stepped portion of the land is a vertical plane. For example, when constructing a masonry retaining wall with a height of 5 m, a setback of about 3 m is required. In addition, masonry retaining walls made of Machi stone are prohibited from exceeding a height of 5 m. Furthermore, the work of stacking Machi stones one by one is hard work, and in recent years the number of professionally engaged workers has decreased, making construction difficult.

In the case of a cantilever type retaining wall, since the bottom plate protruding in front of or behind the vertical surface of the vertical wall is buried in the ground, the foundation of the building cannot be installed in the area that interferes with the bottom plate. Therefore, there is a problem that land that cannot be used for buildings is generated on the front (front) side or the rear (back) side of the retaining wall, and the land cannot be effectively used especially in urban areas. In addition, in the case of an L-shaped cantilever type retaining wall, a construction space excavated by a temporary mountain retaining wall is required on the rear side of the retaining wall, so the place where this retaining wall can be installed is limited or used for buildings. There will be land that cannot be done. For example, when constructing an L-shaped cantilever retaining wall with a height of 5 m, a setback of 5 m is required.

When a precast concrete panel is connected to a support pile with a connecting member such as an anchor or a tension bolt as in the technique described in Patent Document 1, the anchor or the tension bolt or the like is connected on the rear surface side of the panel and the support pile. Therefore, it is necessary to excavate the rear surface side of the support pile to secure a construction space (temporary scaffolding installation space, work space, etc.). Therefore, the place where this retaining wall can be installed is limited, and some land cannot be used for buildings.

Further, the connection portion of the precast concrete panel with the connecting member is formed in advance on the panel before the on-site construction, and cannot be post-constructed. Therefore, in order to install the panel in the required direction and position with respect to the support pile, it is necessary to build the support pile accurately at the site, and it is very difficult to install the retaining wall using the precast concrete panel. Is. Further, since a metal member such as an anchor or a tension bolt comes into direct contact with the soil, the bonding force may decrease due to corrosion. Furthermore, the delivery date of precast concrete panels may depend on the circumstances of the manufacturer's factory, so it may not be possible to install retaining walls at the site when necessary.

The present invention has been made in view of such circumstances, and can be easily constructed on site in a short period of time without reducing the flat land for building a building as much as possible, and soil. It is an object of the present invention to provide a retaining wall capable of reliably and long-term support for the horizontal component of pressure and a method for constructing the retaining wall.

In order to solve the above problems, the following means are adopted for the retaining wall of the present invention and the method for constructing the retaining wall.
That is, the retaining wall according to the present invention has a plurality of columnar portions formed by cement milk in the ground and H-shaped steel whose lower portion is arranged inside the columnar portion and whose upper portion is exposed from the columnar portion. A shaped steel having a support pile, a web, a first flange formed on one end side of the web, and a second flange formed on the other end side of the web, and the web is arranged substantially horizontally. The first flange is formed of a connecting member fixed to the H-section steel of the support pile and reinforced concrete, arranged along the H-section steel of the plurality of support piles, and embedded therein. It is fixed to the support pile via a connecting member and includes a wall member that receives a horizontal component of soil pressure.

According to this configuration, the plurality of support piles each have a columnar portion and an H-shaped steel, the columnar portion is formed by cement milk in the ground, and the lower portion of the H-shaped steel is arranged inside the columnar portion. , The upper part of the H-section steel is exposed from the columnar part. The connecting member is a shaped steel having a web, a first flange formed on one end side of the web, and a second flange formed on the other end side of the web, and the web is arranged substantially horizontally, and the first flange is formed. It is fixed to the H-shaped steel of the support pile.

Further, the wall member is formed of reinforced concrete and is arranged along the H-shaped steel of a plurality of support piles, and the connecting member is embedded inside and fixed to the support pile via the connecting member. Receives horizontal components. The connecting member is embedded in the wall member formed of reinforced concrete, and the wall member is fixed to the supporting pile via the connecting member, so that the supporting pile and the wall member have an integrated composite structure. The wall member receives the horizontal component of earth pressure and transmits the force to the H-shaped steel at the upper part of the support pile and the lower part of the support pile through the connecting member.

In the retaining wall described above, it is desirable that the reinforcing bars of the reinforced concrete forming the wall member are fixed to the connecting member.

According to this configuration, the reinforcing bars of the reinforced concrete forming the wall member are fixed to the connecting member, and the stress applied to the wall member is reliably transmitted to the support pile via the connecting member.

In the above-mentioned retaining wall, it is desirable that the shaped steel of the connecting member is a channel steel, an I-shaped steel, a joist steel or an H-shaped steel produced by hot rolling.

According to this configuration, the shaped steel of the connecting member is a channel steel, an I-shaped steel, a joist steel or an H-shaped steel manufactured by hot rolling, and unlike the cast one, the strength is strong regardless of the product. Since there is no variation and it is stable, the structural design of the retaining wall is easy, and the required strength of the retaining wall can be surely secured.

In the retaining wall described above, it is desirable that the H-section steel of the support pile and the connecting member are fixed to each other by welding or joining with high-strength bolts.

According to this configuration, since the connecting member is fixed to the H-shaped steel of the support pile by welding or joining with high-strength bolts, the connecting member can be easily fixed at the construction site.

The method for constructing a retaining wall according to the present invention has a columnar portion formed by cement milk in the ground and an H-section steel whose lower portion is arranged inside the columnar portion and whose upper portion is exposed from the columnar portion. A connecting member which is a shaped steel having a step of installing a plurality of support piles, a web, a first flange formed on one end side of the web, and a second flange formed on the other end side of the web. The step of fixing the first flange of the connecting member to the H-shaped steel of the supporting pile and the connecting member embedded therein to the supporting pile so that the web is arranged substantially horizontally. A step of arranging a wall member formed of reinforced concrete, which receives a horizontal component of soil pressure so as to be fixed, along the H-section steel of the plurality of support piles is provided.

According to the present invention, it is possible to easily construct a building on site in a short period of time without reducing the land for constructing the building as much as possible, and to support the horizontal component of earth pressure reliably and for a long period of time. Can be done.

It is a front view which shows the retaining wall which concerns on one Embodiment of this invention. It is a vertical sectional view which shows the retaining wall which concerns on one Embodiment of this invention. It is a top view which shows the retaining wall which concerns on one Embodiment of this invention. It is a vertical sectional view which shows the connecting member of the retaining wall which concerns on one Embodiment of this invention. It is sectional drawing which shows the connecting member of the retaining wall which concerns on one Embodiment of this invention. It is a front view which shows the connecting member of the retaining wall which concerns on one Embodiment of this invention. It is a vertical cross-sectional view which shows the modification of the connecting member of the retaining wall which concerns on one Embodiment of this invention. It is sectional drawing which shows the modification of the connecting member of the retaining wall which concerns on one Embodiment of this invention. It is a front view which shows the modification of the connecting member of the retaining wall which concerns on one Embodiment of this invention. It is a partially enlarged vertical sectional view which shows the modification of the connecting member of the retaining wall which concerns on one Embodiment of this invention.

Hereinafter, the retaining wall 1 according to the embodiment of the present invention will be described with reference to the drawings.
The retaining wall 1 according to an embodiment of the present invention is a structure that prevents the collapse of the land by receiving the earth pressure of the land having a height difference such as a cut or an embankment. According to this embodiment, the retaining wall 1 is constructed on the site easily and in a relatively short period of time without reducing the flat land that can be utilized on the front (front) side or the rear (back) side of the retaining wall 1. be able to.

The retaining wall 1 according to this embodiment has, for example, a support pile 2, a connecting member 3, a wall member 4, and the like, as shown in FIGS. 1 to 6. As shown in FIGS. 4 and 5, the connecting member 3 is embedded in the wall member 4 formed of reinforced concrete, and the wall member 4 is fixed to the supporting pile 2 via the connecting member 3, so that the supporting pile 2 is used. And the wall member 4 have an integrated synthetic structure. The wall member 4 receives the horizontal component of earth pressure and transmits the force to the H-shaped steel 6 above the support pile 2 and the lower part of the support pile 2 via the connecting member 3.

As shown in FIGS. 1 to 3, the support pile 2 has, for example, a columnar portion 5 formed by cement milk in the ground and an H-shaped steel 6 fixed to the columnar portion 5. The support pile 2 is fixed and rooted in the ground by the cement milk method, and is installed so that the axis of the support pile 2 is in the vertical direction. The lower part of the H-shaped steel 6 is arranged inside the columnar portion 5, and the upper part of the H-shaped steel 6 is exposed from the columnar portion 5. Cement milk is produced, for example, by mixing soil, water, cement, and bentonite mixture in a compounding plant at a construction site.

The lower end side of the support pile 2 is buried in the ground, and the lowermost end portion is fixed to the support layer of the ground. A plurality of support piles 2 are installed at intervals along the wall surface of the wall member 4 to be formed. The distance between the support piles 2 is, for example, 2000 mm. The wall member 4 is fixed to the support pile 2 via the connecting member 3 at the upper part. In the portion where the wall member 4 is fixed, the H-shaped steel 6 is exposed without being covered by the columnar portion 5 formed by the cement milk. That is, the upper part of the support pile 2 to which the earth pressure is transmitted from the wall member 4 receives the force by the H-shaped steel 6 and transmits the transmitted force to the lower part of the support pile 2 buried in the ground.

The H-section steel 6 is a section steel manufactured by hot rolling and has a web and two flanges parallel to each other. The support pile 2 is installed so that the plate surface of the flange of the H-shaped steel 6 is parallel to the wall surface of the wall member 4. The H-beam 6 is a standard product based on JIS (Japanese Industrial Standards), etc., and the size of the H-beam 6 is, for example, 250 × 250, 300 × 300, 350 × 350, 400 for standard cross-sectional dimensions H × B. For example, x400.

In one support pile 2, a plurality of H-shaped steels 6 may be connected in the axial direction. The H-shaped steels 6 are joined by, for example, high-strength bolts.

A plurality of connecting members 3 are fixed to the flange of the H-section steel 6 by welding or high-strength bolt joining. As a result, the H-shaped steel 6 and the connecting member 3 come into surface contact with each other, so that the force is transmitted between the H-shaped steel 6 and the connecting member 3 by the surface. The fixing of the H-shaped steel 6 and the connecting member 3 will be described later.

The connecting member 3 is fixed to the H-shaped steel 6 of each support pile 2 and is embedded inside the wall member 4 to integrate the support pile 2 and the wall member 4. The connecting member 3 is a shaped steel manufactured by hot rolling, and is, for example, a standard product based on JIS. In the case of hot-rolled shaped steel, unlike the cast one, the connecting member 3 is stable with no variation in strength regardless of the product, so that the structural design of the retaining wall 1 is easy and the structural design of the retaining wall 1 is easy. The required strength of the retaining wall 1 can be surely secured. The connecting member 3 is formed by cutting a shaped steel with a length of about 50 mm, for example.

The shaped steel is, for example, channel steel, H-shaped steel (narrow width), I-shaped steel, and joist steel, and has a web and two flanges formed on one end side and the other end side of the web, respectively. In the case of channel steel, the standard cross-sectional dimensions H × B are 150 × 75, 180 × 75, 200 × 80, and the like. In the case of H-section steel (narrow width), the standard cross-sectional dimensions H × B, web thickness t1, and flange thickness t2 are 150 × 75, 5, 7, 175 × 90, 5, 8, 200 × 100, 5.5, 8, respectively. And so on.

The connecting member 3 is fixed to the support pile 2 in a cantilevered state. In the connecting member 3, one flange (first flange) is fixed to the support pile 2, and the web is arranged substantially horizontally. The flange on the side fixed to the support pile 2 (first flange) is the flange on the fixed end side, and the flange on the side protruding from the support pile 2 is the flange on the free end side. In the case of channel steel, the tip of the flange on the free end side is arranged so as to face upward.

A plurality of connecting members 3 are installed on the H-shaped steel 6 of the support pile 2 at intervals, and the force is transmitted between the support pile 2 and the wall member 4 in each connecting member 3. The distance between the connecting members 3 is, for example, about 200 mm to 300 mm. When the height of the wall member 4 is 6000 mm, about 20 to 30 connecting members 3 are installed on one H-shaped steel 6. It is desirable to make the distance between the connecting members 3 different according to the earth pressure received by the wall member 4. For example, the distance between the connecting members 3 in the lower part of the wall member 4 is narrower than that in the upper part.

Further, the connecting member 3 is fixed to each of the support piles 2 so as to have the same height in the horizontal direction in all the support piles 2. The reinforcing bars 7 of the wall member 4 are placed in the horizontal direction on the horizontal webs of the plurality of connecting members 3 having the same height, and the reinforcing bars 7 are bound to the connecting members 3. As a result, the force can be transmitted between the connecting member 3 and the reinforcing bar 7 of the wall member 4, and the stress applied to the wall member 4 is surely transmitted to the support pile 2 via the connecting member 3.

For example, two reinforcing bars 7 of the wall member 4 are placed on the horizontal web of the connecting member 3. The connecting member 3 which is a shaped steel has a constant shape. Therefore, in a state where the connecting member 3 is fixed to the flange of the H-shaped steel 6 of the support pile 2, the reinforcing bar 7 placed on the web of the connecting member 3 has an angle with respect to the flange surface of the H-shaped steel 6 at the installation location. It will be constant regardless. Further, when arranging the reinforcing bars 7 of the wall member 4, the reinforcing bars 7 of the wall member 4 can be arranged in the horizontal direction only by placing the reinforcing bars 7 of the wall member 4 on the plurality of connecting members 3, so that the reinforcing bars are easily arranged. be. Then, on the horizontal web of the connecting member 3, since the distance between the reinforcing bars 7 is easily maintained at a predetermined distance and the reinforcing bars are easily arranged, the distance between the reinforcing bars 7 can be accurately maintained.

When the connecting member 3 is channel steel, it is easier to arrange the wall member 4 because the reinforcing bar 7 is less likely to be caught by the flange and fall when the tip of the flange is arranged upward. The present invention is not limited to this example, and in the case of channel steel, one end of the flange may be arranged downward.

The wall member 4 comes into contact with the soil and receives a horizontal component of earth pressure. The wall member 4 is made of reinforced concrete and is installed along a plurality of support piles 2. The wall surface of the wall member 4 is formed perpendicular to the horizontal plane. The thickness of the wall member 4 is determined according to the earth pressure received by the wall member 4. The thickness of the wall member 4 is, for example, about 200 mm to 250 mm. The design standard strength of concrete is, for example, Fc24. In the present embodiment, unlike the conventional cantilever type retaining wall, the bottom plate perpendicular to the wall member 4 is not formed.

The wall member 4 is integrated with the support pile 2 by burying the connecting member 3 inside. The wall member 4 receives the horizontal component of earth pressure and transmits the force to the support pile 2 via the connecting member 3 which is a shaped steel arranged inside. The wall member 4 is, for example, reinforced concrete in which reinforcing bars 7 are arranged inside the concrete. The reinforcing bar 7 has, for example, a plurality of horizontal reinforcing bars 7a which are main bars and a plurality of vertical reinforcing bars 7b which are force distribution bars, for example. The horizontal reinforcing bar 7a has a diameter of, for example, D16, and is arranged horizontally on the connecting member 3. The horizontal reinforcing bar 7a is bound to the connecting member 3 and fixed to the connecting member 3. The vertical reinforcing bar 7b has, for example, a diameter of D13. The vertical reinforcing bar 7b is bound to the horizontal reinforcing bar 7a and fixed to the horizontal reinforcing bar 7a.

Each of the horizontal reinforcing bars 7a is placed on the connecting member 3. Therefore, the distance between the horizontal reinforcing bars 7a in the wall member 4 is equal to the distance between the connecting members 3, for example, about 200 mm to 300 mm. The distance between the vertical reinforcing bars 7b in the horizontal direction in the wall member 4 is, for example, about 200 mm to 300 mm. Reinforcing bars 7 are arranged in a grid pattern inside the wall member 4 by the horizontal reinforcing bars 7a and the vertical reinforcing bars 7b.

The wall member 4 is installed and rooted to a position (underground) below the ground surface below the step portion. At the lower end of the wall member 4, a foundation beam 8 that receives a ground reaction force may be formed along the lower end. By installing the wall member 4 and the foundation beam 8 in the ground, it is possible to prevent heaving that may occur depending on the nature of the ground. By adjusting the embedding depth, it is possible to prevent the phenomenon (arc slip) in which the soil above the stepped portion of the land (back soil) passes under the retaining wall 1 due to consolidation settlement and pushes up the excavated bottom ground below the stepped portion. ..

Hereinafter, fixing of the support pile 2 and the connecting member 3 will be described.
The flanges of the H-shaped steel 6 of the support pile 2 are fixed so that the flanges on the fixed end side of the connecting member 3 are in surface contact with each other. For example, as shown in FIGS. 4 to 6, the support pile 2 and the connecting member 3 are fixed to each other by joining by arc welding. Members can be joined by welding with a generator and welder (welder) that is usually used at construction sites, and the joining members 3 can be joined to the support piles 2 at the site quickly and easily. Can be done. Further, according to the welding work at the site, it is easy to adjust the height position of the connecting member 3.

Further, as shown in FIGS. 7 to 9, the support pile 2 and the connecting member 3 may be fixed to each other by joining with high-strength bolts 9. The high-strength bolt 9 is, for example, a Torcia type high-strength bolt (S10T M22), and the tightening torque can be confirmed by breaking the pin tail formed in advance at the tip, and the mounting strength is uniform for a plurality of high-strength bolts 9. Can be secured. The high-strength bolt 9 is fastened using a shear wrench (for example, an ultra-short type). In the case of joining with high-strength bolts 9, the work can be performed only with the generator.

It is preferable to adjust or select the shape and size of the connecting member 3 so that the shear wrench and the connecting member 3 do not interfere with each other. For example, in the examples shown in FIGS. 7 to 9, as shown in FIG. 8, the plan view shape of the connecting member 3 is trapezoidal, and the base end side flange fixed to the support pile 2 is the tip end side flange on the protruding side. Wider than. The width of the base end side flange is, for example, 160 mm, and the width of the tip end side flange is, for example, 50 mm. Further, as shown in FIG. 10, since the inner surface side of the flange of the shaped steel is inclined, it is necessary to fasten the high-strength bolt 9 to the flat portion by using the tapered washer 10 for the shaped steel. The diameter of the through hole 11 formed in the support pile 2 may be a loose hole larger than the bolt diameter within an allowable range of proof stress. As a result, the installation position of the connecting member 3 in the height direction can be finely adjusted at the site.

Next, a method of constructing the retaining wall 1 according to the present embodiment will be described.
First, the support pile 2 is built at the site. The support pile 2 is built by the pre-boring cement milk injection compaction method. At this time, by using a construction machine for building (for example, manufactured by Avolon System Co., Ltd.) that can perform excavation, cement milk injection, and building by one unit, the building can be completed in a short period of time with high accuracy. This construction method has low vibration, low noise, and high mobility, so it can be used for construction in urban areas.

The construction work of the support pile 2 will be described in more detail, for example, as follows. The construction machine for construction is equipped with a plurality of, for example, three hanging hooks and a hoisting machine. The excavation auger (drill) of the construction machine for construction moves up and down along the leader which is a guide rail. At the site, the leader is first assembled. The length of the leader is longer than the length of the support pile 2. Since the parts of the leader are pin joints, it can be completed only by the operator of the construction machine. Next, an auger for drilling holes is attached. Then, a hose is connected between the cement milk preparation plant and the rafter provided on the upper part of the auger.

Further, a steel material called a ruler, which serves as a mark for the installation position of the H-shaped steel 6, is marked to determine the pile core, and the auger is set based on the marking. After that, the hole is drilled to a specified depth by the auger, and the cement milk is injected while the auger is pulled out and the soil is carried out at the same rotation as when the hole is drilled. As a result, the pressure of the cement milk prevents the drilling wall from collapsing.

Next, with the auger and leader suspended from the construction machine, the first H-shaped steel 6 in the axial direction of the support pile 2 is hung on one of the three suspension hooks. , Lifted, moved to the upper part of the drilling hole and built in the drilling hole. A gusset plate for joining the first H-section steel 6 with the second H-section steel 6 is previously joined with high-strength bolts. It is desirable that the H-section steel 6 is formed with through holes for high-strength bolts before being carried to the site.

When the H-section steel 6 is built, the built-in position is finely adjusted by optical and laser position measuring instruments and spirit levels. When the top end of the H-shaped steel 6 is about 1 m from the ground (GL), the first H-shaped steel 6 is stopped from being built and removed from the hanging hook. Then, after the second H-shaped steel 6 in the axial direction is hung on the hanging hook, it is lifted and moved to the upper part of the first H-shaped steel 6. The second H-section steel 6 is inserted between the gusset plates attached to the first H-section steel 6 and then tightened with high-strength bolts. When the two connected H-shaped steels 6 are built as one support pile 2 to a predetermined depth, the building of one support pile 2 is completed. The same work is performed on the other support piles 2 in order.

If it is necessary to excavate the front of the support pile 2 on a slope or the like after the support pile 2 is built, after the horizontal sheet pile is buried in the ground between the support piles 2 and piled up in the height direction before excavation. , The front side of the support pile 2 may be excavated in the same manner as the construction method of the temporary retaining pile. The horizontal sheet pile can also be used as a formwork when forming the wall member 4. The horizontal sheet pile does not need to be removed after the concrete is placed, and can be left buried in the soil on the rear surface side of the retaining wall 1 as a part of the wall member 4.

After the construction of the plurality of support piles 2 is completed, the connecting member 3 which is a shaped steel is fixed to the support piles 2. First, the fixing position of the connecting member 3 is determined on the flange of the support pile 2 by marking out. The fixing of the connecting member 3 is a welding joint or a high-strength bolt joint. After the fixing position of the connecting member 3 is determined at the site, the connecting member 3 is fixed by welding or high-strength bolt joining.

When the connecting member 3 is fixed on site, there are the following advantages, unlike the case where the connecting member 3 is fixed to the H-shaped steel 6 in advance at the factory. That is, since the connecting member 3 is fixed at the site, there is an advantage that the installation position of the connecting member 3 is not affected by the building accuracy of the support pile 2. Further, since the H-shaped steel 6 is transported, carried in, stored, and built in a state where the connecting member 3 is not fixed, the H-shaped steel 6 has an advantage that the H-shaped steel 6 can be handled without being hindered by the connecting member 3. There is an advantage that it is easy to balance when the shaped steel 6 is suspended and built, and it is easy to hold the H-shaped steel 6 vertically.

After all the connecting members 3 are fixed to the support piles 2, reinforcement arrangement work for forming the wall members 4 is performed. Since the horizontal reinforcing bar 7a may be placed on the connecting member 3 which is a shaped steel, the work is easy. The reinforcing bars 7 of the wall member 4 are arranged by binding the horizontal reinforcing bars 7a to the connecting member 3 or binding the vertical reinforcing bars 7b to the horizontal reinforcing bars 7a.

Next, the concrete portion of the wall member 4 is formed. The wall member 4 is formed of cast-in-place concrete. That is, the formwork is built, concrete is cast, and the formwork is removed after the predetermined concrete strength is secured. As a result, the structure of the retaining wall 1 in which the wall member 4 is integrated with the support pile 2 is completed.

As described above, according to the present embodiment, the wall member 4 made of reinforced concrete receives the horizontal component of earth pressure and transmits the force to the support pile 2 via the connecting member 3 which is a shaped steel arranged inside. .. The retaining wall 1 has a composite structure in which a support pile 2 made of H-shaped steel and a wall member 4 made of reinforced concrete are integrated. Therefore, the retaining wall 1 can be structurally calculated by the method usually used for supporting piles of H-shaped steel, shaped steel, and reinforced concrete walls, and does not require special analysis. It is also possible to calculate by the method stipulated in the law. Therefore, in the present embodiment, it is easy to confirm the strength.

On the other hand, the retaining wall made of conventional precast concrete panels is point-supported by metal members such as anchors or tension bolts. Therefore, in order to confirm the strength of the structure, structural analysis by the finite element method is performed. Special analysis is required. In the present embodiment, as compared with the retaining wall made of precast concrete panel, the labor and time required for structural design can be reduced, and the strength of the retaining wall 1 can be presented by a method that can be easily understood by a third party. ..

According to this embodiment, unlike a masonry retaining wall, the vertical wall does not need to be a slope, and unlike a cantilever type retaining wall, a bottom plate protruding forward or backward of the vertical surface of the vertical wall in the ground. Is not buried. Therefore, the flat land is not reduced and there is no area that interferes with the foundation of the building, so that the land for building the building can be secured to the maximum.

In the present embodiment, the connecting member 3 which is a shaped steel is attached to the front side of the support pile 2, and is housed inside the wall member 4 on the front side of the support pile 2, so that the support pile 2 and the wall member 4 are integrated. Be made. In a conventional retaining wall using precast concrete panels, anchors or tension bolts are connected on the rear side of the panel and support piles, so the rear side of the support piles is excavated to create a construction space (temporary scaffolding installation space and work). Space etc.) must be secured. On the other hand, in the present embodiment, the connecting member 3 can be attached or the wall member 4 can be formed on the front surface side of the support pile 2, and there is no need to work on the rear surface side of the support pile 2. The space on the rear surface side of the wall member 4 does not need to be secured more than the space for installing the support pile 2.

Therefore, if the retaining wall is constructed on a slope where the land behind the retaining wall is 5 m higher and the land in the foreground is low, and a flat land is created in the foreground, the retaining wall can be used in any of the conventional construction methods. The wall must be constructed at least 3 m before the border with the land in the back. On the other hand, in the present embodiment, the retaining wall 1 can be installed by separating the space for installing the support pile 2 (for example, the excavation diameter of the support pile 2 from 500 mm to 600 mm) from the boundary line of the adjacent land.

In addition, since the connection part of the precast concrete panel cannot be post-constructed, in order to install the panel on the support pile, it is necessary to build the support pile at the site with high accuracy in both the vertical direction and the horizontal direction. On the other hand, in the present embodiment, the fixing position of the connecting member 3 can be determined at the site, and the wall member 4 can be formed of cast-in-place concrete, so that the building accuracy of the support pile 2 is not affected. The wall member 4 can be installed accurately and easily. Furthermore, since the shape of the precast concrete panel is fixed to some extent, it may not be possible to handle it depending on the design conditions such as the site conditions of the construction site. On the other hand, in the present embodiment, since the wall member 4 is reinforced concrete formed at the site, the retaining wall 1 flexibly corresponding to the design conditions can be designed and constructed.

Further, in the present embodiment, since the support pile 2 and the wall member 4 are integrated via the connecting member 3 inside the reinforced concrete, a metal member such as an anchor or a tension bolt at the joint portion of the panel comes into contact with the soil. Unlike the case, there is no risk of deterioration of durability due to corrosion. Furthermore, in the present embodiment, since the wall member 4 can be formed from cast-in-place concrete, unlike the precast concrete panel, the construction period at the construction site is not affected by the delivery date from the factory, and the cost is also large. Can be suppressed.

Further, in the present embodiment, shaped steel, reinforced concrete, etc., which are usually used as building materials, are used, and techniques generally used for the work performed in each process can be applied, which is advanced. Technology that requires precision is not required. Therefore, the retaining wall 1 according to the present embodiment can be installed at a construction site under various conditions.

1: Retaining wall 2: Support pile 3: Connecting member 4: Wall member 5: Columnar part 6: H-shaped steel 7: Reinforcing bar 7a: Horizontal reinforcing bar 7b: Vertical reinforcing bar 8: Foundation beam 9: High-strength bolt 10: Tapered washer 11 : Through hole

Claims (5)

A plurality of support piles each having a columnar portion formed by cement milk in the ground and an H-shaped steel whose lower portion is arranged inside the columnar portion and whose upper portion is exposed from the columnar portion.
A shaped steel having a web, a first flange formed on one end side of the web, and a second flange formed on the other end side of the web. The web is arranged substantially horizontally, and the first flange is formed. A connecting member whose flange is fixed to the H-section steel of the support pile, and
A wall member formed of reinforced concrete, arranged along the H-section steel of the plurality of support piles, fixed to the support piles via the connecting members embedded inside, and receiving a horizontal component of earth pressure. When,
Retaining wall with. The retaining wall according to claim 1, wherein the reinforcing bar of the reinforced concrete forming the wall member is fixed to the connecting member. The retaining wall according to claim 1 or 2, wherein the shaped steel of the connecting member is a channel steel, an I-shaped steel, a joist steel or an H-shaped steel manufactured by hot rolling. The retaining wall according to any one of claims 1 to 3, wherein the H-section steel of the support pile and the connecting member are fixed to each other by welding or joining with high-strength bolts. A step of installing a plurality of support piles each having a columnar portion formed by cement milk in the ground and an H-shaped steel whose lower portion is arranged inside the columnar portion and whose upper portion is exposed from the columnar portion.
The web of the connecting member, which is a shaped steel having a web, a first flange formed on one end side of the web, and a second flange formed on the other end side of the web, is arranged substantially horizontally. In addition, a step of fixing the first flange of the connecting member to the H-shaped steel of the support pile, and
A wall member formed of reinforced concrete, which receives a horizontal component of earth pressure so as to be fixed to the support pile via the connecting member embedded therein, is provided along the H-section steel of the plurality of the support piles. The process of arranging and
How to build a retaining wall with.

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