TW202233946A - Retaining wall and its construction method The retaining wall can be easily carried out on site and reliably support the horizontal component of earth pressure for a long period of time, minimizing the reduction of flatland for construction as far as possible. - Google Patents

Abstract

The purpose of this invention is to provide a type of retaining wall and its construction method, which can be easily carried out on site in a short period of time and reliably support the horizontal component of earth pressure for a long period of time, minimizing the reduction of flatland for construction as far as possible. This retaining wall includes: Two or more supporting piles 2, each of which has a columnar part formed of cement slurry in the foundations, and an H-shaped steel 6, the bottom of which is embedded in the columnar part and the top of which is exposed from columnar part; A connecting member 3, which is a shaped steel including a beam web, a first flange formed at the one end of the beam web, and a second flange formed at the other end of the beam web, wherein the beam web is arranged substantially horizontally, and the first flange is fixed to the H-shaped steel 6 of supporting piles 2; and a wall member 4, which is formed of reinforced concrete, arranged along the H-shaped steel 6 of the multiple supporting piles and fixed to the supporting piles 2 through connecting member 3 embedded in its interior, in order to withstand the horizontal component of earth pressure.

Description

Retaining wall and its construction method

The present invention relates to a retaining wall and its construction method.

A retaining wall is a structure that withstands the earth pressure of soil with a difference in height such as cut soil or piled soil and prevents the land from disintegrating. It is known to use a stone retaining wall such as a kenchiishi stone or an inverted T. Cantilever retaining wall, L-shaped or inverted L-shaped, etc.

In addition, among the retaining walls, as shown in the following Patent Document 1, there is a retaining wall having a structure in which a plurality of H-shaped steel piles (supporting piles) are driven at predetermined intervals by using anchors or Metal joint members such as tension bolts are used to support precast concrete wall panels. [Prior Art Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2009-162029.

[The problem to be solved by the invention]

The conventional stone retaining wall and cantilever retaining wall have the following problems in addition to the time and cost of construction. That is, in the stone-built retaining wall, the slope of the stone-built retaining wall must be set to be 65° or less with respect to the horizontal plane, so that the level of land that can be secured is reduced compared to the case where the level difference of the land is set to a vertical plane. For example, in the case of constructing a stone retaining wall with a height of 5m, a setback of about 3m is required. In addition, the stone-built retaining wall made of quadrangular pyramid-shaped stone is prohibited to exceed a height of 5m. Furthermore, the work of stacking the pyramid-shaped stones one by one is a heavy manual labor, and in recent years, the number of specialized workers has decreased, making it difficult to build.

In the case of a cantilevered retaining wall, a base plate protruding to the front or rear of the vertical surface of the vertical wall is buried in the ground, so the area that interferes with the base plate cannot set the foundation of the building. Therefore, the front (front) side or the rear (back) side of the retaining wall generates land that cannot be used for buildings, and there is a problem that the land cannot be effectively used especially in cities and the like. In addition, in the case of an L-shaped cantilever retaining wall, a construction space is required to be excavated with a temporary retaining wall on the rear side of the retaining wall, so the place where the retaining wall can be installed is limited, or it may not be used for buildings. the land. For example, in the case of constructing an L-shaped cantilever retaining wall with a height of 5m, it needs to be moved back by 5m.

As in the technique described in Patent Document 1, when a support pile is connected to a concrete wall panel by a coupling member such as an anchor or a tension bolt, the anchor or tension is connected to the back side of the wall panel and the support pile. Therefore, it is necessary to excavate the rear side of the support pile to secure the construction space (the installation space of the temporary scaffold, the work space, etc.). Therefore, there may be restrictions on the place where the retaining wall can be installed, or there may be situations where the land cannot be used for buildings.

In addition, the connection part with the connecting member in the concrete wall panel is pre-formed on the wall panel before the on-site construction, and cannot be constructed later. Therefore, in order to set the wall panel in the required orientation or position with respect to the support pile, it is necessary to drive the support pile on site with high precision, and it is very difficult to install the retaining wall using the concrete wall panel. Furthermore, since metal members, such as anchors and tension bolts, are in direct contact with soil, there is a possibility that the binding force may be reduced due to corrosion. In addition, the delivery time of the concrete wall panels sometimes depends on the arrangement of the manufacturer's factory, so it may not be possible to install retaining walls on site during the necessary period.

The present invention is made in view of such a situation, and its object is to provide a retaining wall and a method for constructing the same, which can be constructed on site easily and in a short period of time without reducing the level of land for building buildings as much as possible. The horizontal components of the pressure can be supported reliably and long-term. [means to solve the problem]

In order to solve the above-mentioned problems, the retaining wall and its construction method of the present invention employ the following means. That is, the retaining wall system of the present invention is provided with: a plurality of supporting piles, each having a columnar part formed by cement slurry in the foundation, and the lower part is arranged inside the columnar part, and the upper part is formed from the above-mentioned columnar part. H-shaped steel exposed in the columnar part; connecting member having a web, a first flange formed on one end side of the web, and a second flange formed on the other end of the web shaped steel, the beam web is arranged substantially horizontally, the first flange is fixed to the H-shaped steel of the support pile; and the wall member is formed of reinforced concrete, along the H-shaped steel of the plurality of support piles The arrangement is fixed to the support pile via the connecting member embedded in the interior, and receives the horizontal component of the earth pressure.

According to this configuration, each of the plurality of support piles has a columnar part and an H-shaped steel, the columnar part is formed of cement slurry in the foundation, the lower part of the H-shaped steel is arranged inside the columnar part, and the upper part of the H-shaped steel is formed from the column. The shape part is exposed. The connecting member is a shaped steel having a beam web, a first flange formed on one end side of the beam web, and a second flange formed on the other end side of the beam web, and the beam web is arranged substantially horizontally, and the first flange H-shaped steel fixed to support piles.

The wall members are made of reinforced concrete, are arranged along the H-shaped steel of a plurality of support piles, have connecting members embedded in the interior, are fixed to the support piles via the connecting members, and receive a horizontal component of earth pressure. The connecting member is embedded in the wall member formed of reinforced concrete, and the wall member is fixed to the support pile through the connecting member, thereby having a composite structure in which the support pile and the wall member are integrated. The wall member receives the horizontal component of the earth pressure, and transmits the force to the H-shaped steel above the support pile and the lower part of the support pile through the connecting member.

In the above-mentioned retaining wall, it is preferable 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 preferable that the aforementioned shaped steel of the aforementioned connecting member is a channel shaped steel, an I shaped steel, a beam steel or an H shaped steel manufactured by hot rolling.

According to this structure, the shaped steel of the connecting member is channel steel, I-shaped steel, beam steel or H-shaped steel produced by hot rolling. Unlike cast products, there is no unevenness in strength between products and it is stable. The structural design of the earth wall is easy and can reliably ensure the required strength of the retaining wall.

In the above-mentioned retaining wall, it is preferable that the H-shaped steel of the supporting pile and the connecting member are fixed to each other by joining by welding or by joining by high-strength bolts.

According to this structure, since the connecting member is the H-shaped steel fixed to the support pile by welding or joining with a high-strength bolt, the connecting member can be easily fixed on the construction site.

The method for constructing a retaining wall of the present invention includes the following steps: disposing a plurality of supporting piles, the plurality of supporting piles respectively having a columnar part formed by cement slurry in the foundation, and a lower part of the columnar part disposed on the columnar part. H-shaped steel whose inner and upper part is exposed from the columnar part; the first flange, which has a beam web, a first flange, and a second flange, and is a connecting member of section steel, is fixed to the H-shaped steel of the support pile. steel so that the web of the connecting member is arranged substantially horizontally, wherein the first flange is formed on one end side of the web, and the second flange is formed on the other end of the web; The connecting member embedded in the interior is fixed to the supporting pile, and a wall member is arranged along the H-shaped steel of the plurality of supporting piles, and the wall member is formed of reinforced concrete to receive the horizontal component of the earth pressure. [Inventive effect]

ADVANTAGE OF THE INVENTION According to this invention, the land for building a building can be reduced as much as possible, and it can carry out on-site construction easily in a short period of time, and can support reliably and long-term with respect to the horizontal component of earth pressure.

Hereinafter, the retaining wall 1 according to one embodiment of the present invention will be described with reference to the drawings. The retaining wall 1 according to one embodiment of the present invention is a structure for preventing the land from collapsing by receiving the earth pressure of the land with a height difference, such as cut soil or piled soil. According to this embodiment, the flat land usable on the front (front) side or the rear (back) side of the retaining wall 1 is not reduced, and the retaining wall 1 can be easily constructed on site in a relatively short period of time.

For example, as shown in FIGS. 1 to 6 , the retaining wall 1 of the present embodiment includes support piles 2 , connecting members 3 , wall members 4 , and the like. 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 support pile 2 via the connecting member 3, whereby the support pile 2 and the wall member 4 are integrated with each other. synthetic structure. The wall member 4 receives the horizontal component of the earth pressure, and transmits the force to the H-shaped steel 6 on the upper part of the support pile 2 and the lower part of the support pile 2 via the connection member 3 .

As shown in FIGS. 1 to 3 , the support pile 2 has, for example, a columnar portion 5 formed of cement slurry within the foundation, and an H-shaped steel 6 fixed to the columnar portion 5 . The support pile 2 is fixed in the foundation by the cement slurry method to stabilize the foundation, and is arranged so that the axis of the support pile 2 becomes the vertical direction. The lower part of the H-shaped steel 6 is arranged inside the columnar part 5 , and the upper part of the H-shaped steel 6 is exposed from the columnar part 5 . Cement slurry is produced by mixing soil, water, cement, and bentonite mixed liquid using, for example, a mixing facility at a construction site.

The supporting pile 2 is embedded in the ground at the lower end, and the lowermost end is fixed to the supporting layer of the foundation. A plurality of supporting piles 2 are provided at intervals along the wall surface of the formed wall member 4 . The distance between the support piles 2 is, for example, 2000 mm. The support pile 2 is fixed to the wall member 4 via the connection member 3 in 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 of the grout. That is, the upper part of the support pile 2 which transmits the earth pressure 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-shaped steel 6 is a shaped steel produced by hot rolling, and has a web and two flanges parallel to each other. The support piles 2 are arranged 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-shaped steel 6 is a standard product based on JIS (Japanese Industrial Standards), etc. The size of the H-shaped steel 6 is, for example, the standard cross-sectional dimension H×B is 250×250, 300×300, 350×350, 400× 400 etc.

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

A plurality of connecting members 3 are fixed to the flange of the H-shaped steel 6 by welding or high-strength bolting. Thereby, since the H-shaped steel 6 and the connecting member 3 are in surface contact, the force transmission system between the H-shaped steel 6 and the connecting member 3 is performed 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 in the inside of 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 based on, for example, a standard product of JIS. In the case of hot-rolled steel, the connecting member 3 is different from the cast product, and there is no uneven strength between the products and is stable, so the structural design of the retaining wall 1 is easy, and the required retaining wall can be reliably ensured. 1 strength. The connecting member 3 is formed, for example, by cutting a shaped steel with a length of about 50 mm.

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

The connection member 3 is fixed in a cantilever state with respect to the support pile 2 . The flange (first flange) on the side of the connecting member 3 is fixed to the support pile 2, and the web is arranged substantially horizontally. The flange (first flange) fixed to the side of the support pile 2 becomes a fixed end side flange, and the flange (second flange) on the side protruding from the support pile 2 becomes a free end side flange. In the case of channel steel, the top end of the flange on the free end side is placed upward.

A plurality of connecting members 3 are provided at intervals above the H-shaped steel 6 of the support pile 2 , and each connecting member 3 transmits the force between the support pile 2 and the wall member 4 . The distance between the connection 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 provided on one H-shaped steel 6 . Desirably, the distance between the connecting members 3 is different according to the earth pressure which the wall member 4 is subjected to. For example, the space between the connecting members 3 in the lower part of the wall member 4 is narrower than that in the upper part.

Moreover, the connection member 3 is being fixed to each support pile 2 so that it may become the same height in the horizontal direction among all the support piles 2. The reinforcing bars 7 of the wall members 4 are placed in the horizontal direction on the horizontal beam webs of the plurality of connecting members 3 having the same height, and the reinforcing bars 7 are bound to the connecting members 3 . Thereby, force can be transmitted between the connection member 3 and the reinforcing bar 7 of the wall member 4, and the stress applied to the wall member 4 is reliably transmitted to the support pile 2 via the connection member 3.

On the horizontal beam web of the connecting member 3, for example, two reinforcing bars 7 of the wall member 4 are placed. The connecting member 3 as the shape steel is fixed in shape. Therefore, in the state where the connecting member 3 is fixed to the flange of the H-shaped steel 6 of the support pile 2, the angle of the reinforcing bar 7 placed on the web of the connecting member 3 with respect to the flange surface of the H-shaped steel 6 is equal to The setting is fixed regardless of location. In addition, when the reinforcing bars 7 of the wall members 4 are arranged, the reinforcing bars 7 of the wall members 4 can be arranged in the horizontal direction only by placing the reinforcing bars 7 of the wall members 3 on the plurality of connecting members 3, so that the reinforcing bar arranging work is easy. Furthermore, it is easy to arrange the reinforcing bars on the horizontal web of the connecting member 3 while keeping the interval between the reinforcing bars 7 at a predetermined distance, so that the interval between the reinforcing bars 7 can be kept accurately.

When the connecting member 3 is channel-shaped steel, when the top end of the flange is placed upward, the reinforcing bar 7 is stuck on the flange and is not easily dropped, so that the reinforcing bar arranging operation of the wall member 4 is easy. In addition, the present invention is not limited to this example, and in the case of channel steel, one end of the flange may be disposed downward.

The wall member 4 is a horizontal component that is in contact with the soil and is subjected to earth pressure. The wall member 4 is made of reinforced concrete, and is provided along the plurality of support piles 2 . The wall surface of the wall member 4 is formed vertically with respect to the horizontal plane. The thickness of the wall member 4 is determined according to the earth pressure to which the wall member 4 is subjected. The thickness of the wall member 4 is, for example, about 200 mm to 250 mm. The design basis strength of concrete is, for example, Fc24. In this embodiment, unlike the conventional cantilever type retaining wall, a bottom plate perpendicular to the wall member 4 is not formed.

The wall member 4 is integrated with the support pile 2 by embedding the connecting member 3 therein. The wall member 4 receives the horizontal component of the 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 includes, for example, a plurality of horizontal reinforcing bars 7a, which are main reinforcing bars, and a plurality of vertical reinforcing bars 7b, which are, for example, distribution reinforcing bars. The horizontal reinforcing bar 7a has a diameter of, for example, D16, and is arranged on the connecting member 3 in the horizontal direction. The horizontal reinforcing bar 7a is bound to the connecting member 3 and fixed to the connecting member 3 . The longitudinal reinforcement 7b has a diameter of, for example, D13. The vertical reinforcing bars 7b are bound to the horizontal reinforcing bars 7a, and are fixed to the horizontal reinforcing bars 7a.

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

The wall member 4 is installed at a position (underground) lower than the ground surface on the lower side of the stepped portion to enter the ground. At the lower end of the wall member 4, a base beam 8 for receiving the ground reaction force along the lower end may also be formed. By arranging the wall member 4 or the base beam 8 on the ground, it is possible to prevent heaving that may be generated depending on the nature of the ground. By adjusting the depth of penetration into the ground, it is possible to prevent the following phenomenon (arc sliding): the soil on the upper side of the stepped part of the ground (the back soil) burrows under the retaining wall 1 due to compaction and subsidence, and the stepped part is lowered. The side digging bottom foundation is pushed up.

Hereinafter, the fixing of the support pile 2 and the connecting member 3 will be described. The flanges on the fixed end side of the connecting member 3 are fixed to the flanges of the H-shaped steel 6 of the support pile 2 so as to be 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. The members can be joined to each other by welding work using a generator and welding machine (welder) generally used at the construction site, and the joining work of the connecting member 3 to the support pile 2 can be quickly and easily carried out on site. Moreover, adjustment of the height position of the connection member 3 is easy according to the welding work on site.

In addition, as shown in FIGS. 7 to 9 , the support pile 2 and the connecting member 3 may also be fixed to each other by joining with high-strength bolts 9 . The high-strength bolts 9 are, for example, large hexagonal high-strength bolts (S10T M22), and the tightening torque can be confirmed according to the breakage of the pin tail formed in advance at the top end, and an equal mounting strength can be ensured for a plurality of high-strength bolts 9 . The high-strength bolts 9 are fastened using a torsion shear wrench (eg, an ultra-short type). In the case of joining by the high-strength bolts 9, only the generator can be used for operation.

Preferably, the shape or size of the connecting member 3 is adjusted or selected in such a way that the torsion shear wrench does not interfere with the connecting member 3 . For example, in the example shown in FIGS. 7 to 9 , as shown in FIG. 8 , the planar view shape of the connecting member 3 is a trapezoid, and the flange on the base end side fixed to the support pile 2 is convex from the top end side on the protruding side. The edge is wider. The width of the base end side flange is, for example, 160 mm, and the width of the distal end side flange is, for example, 50 mm. In addition, as shown in FIG. 10, since the flange of the shaped steel is inclined on the inner surface side, it is necessary to fasten the high-strength bolt 9 to the flat portion using the inclined washer 10 for the shaped steel. The diameter of the through hole 11 formed in the support pile 2 can also be set as a loose hole larger than the diameter of the bolt within the allowable endurance range. Thereby, the installation position of the height direction of the connection member 3 can be finely adjusted on site.

Next, the construction method of the retaining wall 1 of this embodiment is demonstrated. First, the support piles 2 are driven on site. The support pile 2 is driven by the pre-drilling-cement slurry injection fastening method. In this case, by using a construction machine for driving (for example, manufactured by Avolon System Corporation) that can perform digging, cement slurry injection, and driving with one unit, driving can be completed with high accuracy and in a short period of time. This construction method can also be used for construction in urban areas due to its low vibration, low noise and high mobility.

The driving operation of the support pile 2 is described in more detail, for example, as follows. The construction machine system for driving is equipped with a plurality of (for example, three) hooks and winders. The drilling machine (drill) used for digging and digging of the construction machine for driving is moved up and down along the guide frame (leader) which is used as a guide rail. On site, the guide frame is first assembled. The length of the guide frame is longer than that of the support pile 2 . Since the parts of the guide frame are pin joints, it is only done by the operator of the construction machine. Next, a drilling machine for cutting holes is installed. Then, the mixing equipment of the cement slurry and the rafter provided on the upper part of the drilling machine are connected by a hose.

In addition, the target installation position of the H-shaped steel 6 is marked with a steel material called a gauge to determine a pile core, and a drilling machine is installed based on the marking. Then, the hole is drilled to a predetermined depth by the drill, and the cement slurry is poured while the drill is pulled out at the same rotation speed as when the hole was drilled, and the soil is carried out to the outside. Thereby, the pressure of the cement slurry is used to prevent the collapse of the wall of the cut hole.

Then, in the state that the drilling machine and the guide frame are suspended from the construction machine, the first H-shaped steel 6 in the axial direction of the support pile 2 is placed on one of the three hoisting hooks, and then hoisted up. , move to the top of the gouge hole and drive into the gouge hole. On the first H-shaped steel 6, a gusset plate for connecting with the second H-shaped steel 6 is previously joined by high-strength bolts. In addition, it is preferable to form through-holes for high-strength bolts in the H-shaped steel 6 before being carried in to the site.

When driving the H-shaped steel 6, the fine adjustment of the driving position is performed by an optical and laser position measuring device and a level. When the top of the H-shaped steel 6 is about 1m away from the ground (GL), stop driving the first H-shaped steel 6 and remove it from the hook. Then, after the second H-shaped steel 6 in the axial direction is placed on the hook, it is lifted and moved to the upper part of the first H-shaped steel 6 . The second H-shaped steel 6 is inserted into the gusset plate installed on the first H-shaped steel 6, and then fastened with high-strength bolts. When the connected two H-shaped steels 6 are driven to a predetermined depth as one support pile 2 , the driving of one support pile 2 is completed. The same operation is performed on the other support piles 2 in sequence.

After driving the support piles 2, when it is necessary to excavate the front of the support piles 2 in inclined places, etc., just bury the horizontal guard plates in the bottom between the support piles 2 and stack them in the height direction before excavation. In the construction method of the temporary retaining wall, the front side of the support pile 2 may be excavated in the same manner. In addition, the transverse panel can also be used as a formwork when forming the wall member 4 . The cross guard does not need to be removed after the concrete is poured, and can be kept as a part of the wall member 4 in a state of being buried by the soil on the rear side of the retaining wall 1 .

After the driving of the plurality of supporting piles 2 is completed, the supporting piles 2 are fixed to the supporting piles 2 as the connecting member 3 of the shaped steel. First, the fixing position of the connecting member 3 is determined by setting out the line on the flange of the support pile 2 . The connection member 3 is fixed by welding or high-strength bolting. After the fixing position of the connection member 3 is determined on site, the connection member 3 is fixed by welding or high-strength bolting.

The case where the connection member 3 is fixed on site is different from the case where the connection member 3 is fixed to the H-shaped steel 6 in advance in a factory, and there are the following advantages. That is, since the connection member 3 is fixed on site, there is an advantage that the installation position of the connection member 3 is not affected by the driving accuracy of the support pile 2 . In addition, since the H-shaped steel 6 is transported, carried in, stored, and driven in a state where the connecting member 3 is not fixed, there is an advantage that the H-shaped steel 6 can be handled without being hindered by the connecting member 3, or the H-shaped steel can be hoisted and driven in. 6, it is easy to achieve balance and easy to maintain the advantages of H-shaped steel 6 vertical.

After all the connection members 3 are fixed to the support piles 2, the reinforcement arrangement|positioning work for forming the wall member 4 is performed. Since the horizontal reinforcement bar 7a may be placed on the connecting member 3 as the shaped steel, the operation is easy. The reinforcing bars 7 of the wall member 4 are arranged by binding the horizontal reinforcing bars 7a to the connecting members 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 elements 4 are formed of cast-in-place concrete. That is, driving of the formwork, pouring of the concrete, and removal of the formwork after securing the predetermined strength of the concrete is performed. Thereby, the structure of the retaining wall 1 in which the wall member 4 and the support pile 2 are integrated is completed.

As described above, according to the present embodiment, the wall member 4 made of reinforced concrete receives the horizontal component of the earth pressure, and transmits the force to the support pile 2 via the connecting member 3 which is a shaped steel disposed inside. The retaining wall 1 is a composite structure in which the supporting piles 2 as H-shaped steel and the wall members 4 as reinforced concrete are integrated. Therefore, the retaining wall 1 can be structurally calculated using the methods commonly used for H-shaped steel supporting piles, shaped steel, and reinforced concrete walls, without special analysis, and can also be calculated using the methods specified in building regulations. Therefore, in this embodiment, the strength can be easily confirmed.

On the other hand, conventional retaining walls made of concrete wall panels are point-supported by metal members such as tension bolts. Therefore, in order to confirm the strength as a structure, a structural analysis using the finite element method is required. and other special analysis. In the present embodiment, compared with the retaining wall made of concrete wall panels, the effort or time required for structural design can be reduced, and a third party can be informed of the retaining wall 1 in an easily understandable method. strength.

According to this embodiment, unlike the stone retaining wall, the vertical wall need not be inclined, and unlike the cantilever type retaining wall, the bottom plate projecting forward or rearward of the vertical surface of the vertical wall is not buried in the ground. Therefore, the flat land is not reduced, and since there is no area that interferes with the foundation of the building, the land for building the building can be secured as much as possible.

In the present embodiment, the connecting member 3 as the shaped steel is attached to the front side of the support pile 2, and is accommodated in the wall member 4 on the front side of the support pile 2 to integrate the support pile 2 and the wall member 4. In the conventional retaining wall using concrete wall panels, anchors or tension bolts are connected to the back side of the wall panels and the supporting piles, so it is necessary to excavate the back side of the supporting piles to ensure the construction space (for temporary scaffolding). setup space or work space, etc.). On the other hand, in the present embodiment, the connecting member 3 can be mounted on the front side of the support pile 2 and the wall member 4 can be formed, and the work on the rear side of the support pile 2 is not required, so the space on the rear side of the wall member 4 is less It is not necessary to secure more than the space for installing the support pile 2 .

Therefore, assuming that the retaining wall is constructed on a slope with a height of 5 m on the land further inward than the retaining wall and the land in front is lower, and the earthwork for leveling the land is performed in the front, in any case of the conventional construction method, the retaining wall is Walls need to be constructed in front of more than 3m from the boundary line of the adjacent land with the inner land. On the other hand, in this embodiment, if there is a space (for example, 500 mm to 600 mm as the cutting diameter of the supporting pile 2) for installing the support piles 2 from the boundary line of the adjacent land, the retaining wall 1 can be installed.

In addition, since the concrete wall panels cannot be constructed after the connection portion, in order to install the wall panels on the support piles, it is necessary to drive the support piles on the site with high precision 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 on-site, and the wall member 4 can be formed by pouring concrete on site, so that it is possible to accurately and easily without being affected by the driving accuracy of the support pile 2 Set up wall member 4. Furthermore, since the shape of the concrete wall panel is fixed to some extent, it may not be possible to cope with the design conditions such as the land conditions of the construction site. On the other hand, in this embodiment, since the wall member 4 is a reinforced concrete formed on site, the retaining wall 1 which flexibly responds to design conditions can be designed and constructed.

Furthermore, in this embodiment, since the support pile 2 and the wall member 4 are integrated through the connecting member 3 inside the reinforced concrete, it is different from the case where the metal member such as the anchor and the tension bolt in the joint portion of the wall panel contacts the soil. There is no fear of a decrease in durability due to corrosion. Furthermore, in this embodiment, the wall member 4 can be formed by pouring concrete in-situ, so unlike the concrete wall panels, the construction time of the construction site is not affected by the delivery time from the factory, and the cost can also be greatly reduced.

In addition, in the present embodiment, shaped steel, reinforced concrete, etc., which are generally used as construction materials, are used, and for the work performed in each step, a commonly performed technique can be applied, and a technique requiring high precision is not required. Therefore, the retaining wall 1 of this embodiment can be installed in construction sites under various conditions.

1: Retaining Wall 2: support pile 3: Connecting components 4: Wall Components 5: Columnar part 6: H-shaped steel 7: Rebar 7a: Transverse reinforcement 7b: Longitudinal reinforcement 8: base beam 9: High-strength bolts 10: Oblique washer 11: Through hole

Fig. 1 is a front view showing a retaining wall according to an embodiment of the present invention. Fig. 2 is a longitudinal sectional view showing a retaining wall according to an embodiment of the present invention. Fig. 3 is a plan view showing a retaining wall according to an embodiment of the present invention. [ Fig. 4] Fig. 4 is a longitudinal sectional view showing a connecting member of a retaining wall according to an embodiment of the present invention. Fig. 5 is a cross-sectional view showing a connecting member of a retaining wall according to an embodiment of the present invention. [ Fig. 6] Fig. 6 is a front view showing a connecting member of a retaining wall according to an embodiment of the present invention. [ Fig. 7] Fig. 7 is a longitudinal sectional view showing a modification of the connecting member of the retaining wall according to one embodiment of the present invention. [ Fig. 8] Fig. 8 is a transverse cross-sectional view showing a modification of the connecting member of the retaining wall according to one embodiment of the present invention. 9] It is a front view which shows the modification of the connection member of the retaining wall which concerns on one Embodiment of this invention. 10 is a partially enlarged longitudinal sectional view showing a modification of the connecting member of the retaining wall according to one embodiment of the present invention.

2: support pile

3: Connecting components

4: Wall Components

6: H-shaped steel

7: Rebar

7a: Transverse reinforcement

7b: Longitudinal reinforcement

Claims (6)

A retaining wall is provided with: A plurality of supporting piles respectively have a columnar part formed by cement slurry in the foundation, and an H-shaped steel whose lower part is arranged inside the columnar part and whose upper part is exposed from the columnar part; The connecting member is a shaped steel having a beam web, a first flange formed on one end side of the beam web, and a second flange formed on the other end side of the beam web, and the beam web is arranged substantially horizontally, the first flange is fixed to the H-shaped steel of the support pile; and The wall member is formed of reinforced concrete, is arranged along the H-shaped steel of a plurality of the support piles, is fixed to the support piles through the connecting member embedded in the interior, and receives a horizontal component of the earth pressure. The retaining wall according to claim 1, wherein the reinforcing bars of the reinforced concrete forming the wall member are fixed to the connecting member. The retaining wall according to claim 1, wherein the shaped steel of the connecting member is channel steel, I-shaped steel, beam steel or H-shaped steel produced by hot rolling. The retaining wall according to claim 2, wherein the shaped steel of the connecting member is channel steel, I-shaped steel, beam steel or H-shaped steel produced by hot rolling. The retaining wall according to any one of claims 1 to 4, wherein the H-shaped steel of the support pile and the connecting member are fixed to each other by joining by welding or joining by high-strength bolts. A method for constructing a retaining wall, comprising the following steps: A plurality of support piles are arranged, and the plurality of support piles respectively have a columnar portion formed by cement slurry in the foundation, and an H-shaped steel whose lower portion is arranged inside the aforementioned columnar portion and whose upper portion is exposed from the aforementioned columnar portion; The first flange of the connecting member, which has a web, a first flange, and a second flange, and is a section steel, is fixed to the H-shaped steel of the support pile so that the web of the connecting member is arranged substantially horizontally. , wherein the first flange is formed on one end side of the beam web, and the second flange is formed on the other end side of the beam web; and The wall members are arranged along the H-shaped steels of the plurality of support piles so as to be fixed to the support piles via the connecting members embedded in the interior, and the wall members are formed of reinforced concrete to receive the horizontal component of the earth pressure.

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