JP2022128854A - Earth retaining wall and construction method thereof - Google Patents

Abstract

To provide an earth retaining wall capable of being simply constructed on site in a short period of time without reducing flat land for constructing a building as much as possible, and capable of reliably supporting a horizontal component of earth pressure over a long period of time to provide a method for constructing the earth retaining wall.SOLUTION: An earth retaining wall comprises a plurality of supporting piles 2 each having a columnar portion formed by cement milk in the ground and an H-shaped steel 6 having a lower portion disposed inside the columnar portion and an upper portion exposed from the columnar portion, a connecting member 3 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, and in which the web is arranged almost horizontally and the first flange is fixed to the H-shaped steel 6 of the support pile 2, and a wall member 4 made of reinforced concrete, arranged along the H-shaped steel 6 of a plurality of supporting piles, fixed to the supporting piles 2 via connecting members 3 embedded inside, and receiving a horizontal component of earth pressure.SELECTED DRAWING: Figure 4

Description

There is an application for the application of Article 30, Paragraph 2 of the Patent Law Satoshi Makino has disclosed a retaining wall invented by Ryoichi Makino and Satoshi Makino, which is being constructed outside 12-5 Funamachi, 22-24 Araki-cho, Shinjuku-ku, Tokyo. .

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

A retaining wall is a structure that prevents the collapse of land by receiving the earth pressure of land with a difference in height such as cut and embankment. Inverted L-shaped cantilever retaining walls and the like are known.

In addition, as shown in Patent Document 1 below, in retaining walls, precast (PCa) concrete panels are attached to the main piles (supporting piles) of a plurality of H-shaped steel piles driven at predetermined intervals with anchors or tension bolts. Some have a structure supported by a metal coupling member such as.

JP 2009-162029 A

Conventional construction methods such as masonry retaining walls and cantilever retaining walls require a long construction period and cost, and also have the following problems. That is, since the masonry retaining wall requires that the slope on which masonry is built be 65° or less with respect to the horizontal plane, the amount of flat land that can be secured is reduced compared to 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 5m, a setback of about 3m is required. Masonry retaining walls made of masonry stones exceeding a height of 5m are prohibited. In addition, the work of stacking the stones one by one is hard work, and in recent years, the number of specialized workers has decreased, making construction difficult.

In the case of a cantilever retaining wall, since the bottom plate protruding forward or backward from 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, land that cannot be used for buildings is generated on the front (front) side or the rear (back) side of the retaining wall, and there is a problem that the land cannot be effectively used particularly in urban areas. In addition, in the case of an L-shaped cantilever retaining wall, a construction space excavated with temporary earth retaining is required on the rear side of the retaining wall. There are some lands that cannot be used. For example, when constructing an L-shaped cantilever retaining wall with a height of 5m, a setback of 5m is required.

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

In addition, the joints of precast concrete panels with connecting members are formed in advance in the panels before construction at the site, and cannot be constructed later. Therefore, in order to install the panel in the required direction and position with respect to the supporting piles, it is necessary to erect the supporting piles precisely on site, and it is very difficult to install a retaining wall using precast concrete panels. is. In addition, since metal members such as anchors or tension bolts are in direct contact with the soil, corrosion can reduce bond strength. Furthermore, the delivery date of the precast concrete panel may depend on the circumstances of the manufacturer's factory, so there is a possibility that the retaining wall cannot be installed at the site at the required time.

The present invention has been made in view of such circumstances, and enables construction on site in a short period of time and with ease without reducing as much as possible the flat land for constructing a building. To provide a retaining wall capable of reliably supporting a horizontal component of pressure over a long period of time and a method for constructing the retaining wall.

In order to solve the above problems, the retaining wall and construction method thereof of the present invention employ the following means.
That is, the retaining wall according to the present invention has a columnar portion formed of cement milk in the ground, and a plurality of H-section steels each having a lower portion disposed inside the columnar portion and an upper portion exposed from the columnar portion. , 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, wherein the web is arranged substantially horizontally and the first flange is formed of a connection 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 inside the a wall member that is fixed to the support pile via a connecting member and receives a horizontal component of earth pressure.

According to this configuration, each of the plurality of supporting piles has a columnar portion and an H-shaped steel, the columnar portion is formed of cement milk in the ground, and the lower portion of the H-shaped steel is disposed inside the columnar portion. , the upper part of the H-section steel is exposed from the column. The connecting member is a section 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, wherein the web is arranged substantially horizontally and the first flange is It is fixed to the H-beam of the supporting pile.

In addition, the wall member is formed of reinforced concrete, is arranged along the H-shaped steel of the plurality of supporting piles, has connecting members buried inside, and is fixed to the supporting piles via the connecting members, thereby preventing soil pressure. receives a horizontal component. Connecting members are embedded in the wall members made of reinforced concrete, and the wall members are fixed to the supporting piles via the connecting members, thereby forming a composite structure in which the supporting piles and the wall members are integrated. The wall member receives the horizontal component of the earth pressure and transmits the force to the H-section steel on the top of the support pile and the bottom of the support pile through the connecting member.

In the retaining wall described above, 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 supporting pile via the connecting member.

In the retaining wall described above, it is preferable that the section steel of the connecting member is channel steel, I-section steel, joist steel, or H-section steel manufactured by hot rolling.

According to this configuration, the shape steel of the connecting member is channel steel, I-shape steel, joist steel or H-shape steel manufactured by hot rolling, and unlike cast steel, it has a high strength regardless of the product. Since it is consistent and stable, the structural design of the retaining wall is easy, and the required strength of the retaining wall can be ensured.

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

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

A 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 having a lower portion disposed inside the columnar portion and an upper portion exposed from the columnar portion. A step of installing a plurality of support piles, a 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. securing the first flange of the connecting member to the H-beam of the support pile such that the web is disposed substantially horizontally; arranging along said H-beams of said plurality of support piles wall members formed by reinforced concrete which are subjected to a horizontal component of earth pressure so as to be fixed.

According to the present invention, a building can be constructed easily on site in a short period of time without reducing the land for constructing the building as much as possible, and the horizontal component of earth pressure can be reliably supported over a long period of time. can be done.

It is a front view showing a retaining wall according to one embodiment of the present invention. It is a longitudinal section showing a retaining wall according to one embodiment of the present invention. It is a top view which shows the retaining wall which concerns on one Embodiment of this invention. FIG. 4 is a vertical cross-sectional view showing a connecting member of a retaining wall according to one embodiment of the present invention; 1 is a cross-sectional view showing a connecting member of a retaining wall according to one embodiment of the present invention; FIG. 1 is a front view showing a connecting member of a retaining wall according to one embodiment of the present invention; FIG. FIG. 5 is a vertical cross-sectional view showing a modification of the connecting member of the retaining wall according to the embodiment of the present invention; FIG. 5 is a cross-sectional view showing a modification of the connecting member of the retaining wall according to the embodiment of the present invention; FIG. 5 is a front view showing a modification of the connecting member of the retaining wall according to the embodiment of the present invention; FIG. 5 is a partially enlarged vertical cross-sectional view showing a modification of the connecting member of the retaining wall according to the embodiment of the present invention;

Below, retaining wall 1 concerning one embodiment of the present invention is explained with reference to drawings.
A retaining wall 1 according to an embodiment of the present invention is a structure that prevents the collapse of land by receiving the earth pressure of land with height differences such as cut and embankment. According to this embodiment, the retaining wall 1 can be constructed easily and in a relatively short period of time without reducing the flat land that can be used on the front (front) side or the rear (back) side of the retaining wall 1. be able to.

A retaining wall 1 according to this embodiment includes, for example, support piles 2, connecting members 3, wall members 4, and the like, as shown in FIGS. 1 to 6 . As shown in FIGS. 4 and 5, the connecting members 3 are embedded in the wall members 4 made of reinforced concrete, and the wall members 4 are fixed to the supporting piles 2 via the connecting members 3. and the wall member 4 have a composite 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 portion of the support pile 2 via the connecting member 3 .

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

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

The H-section steel 6 is a section steel manufactured by hot rolling and has a web and two parallel flanges. 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-section steel 6 is a standardized product based on JIS (Japanese Industrial Standards), etc. The size of the H-section steel 6 is, for example, standard cross-sectional dimensions H × B of 250 × 250, 300 × 300, 350 × 350, 400 x400, and so on.

A plurality of H-section steels 6 may be connected to one supporting pile 2 in the axial direction. The H-section 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 bolting. As a result, the H-section steel 6 and the connecting member 3 come into surface contact, so that force is transmitted between the H-section steel 6 and the connecting member 3 through the surfaces. The fixation 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 supporting pile 2 and embedded inside the wall member 4 to integrate the supporting pile 2 and the wall member 4 . The connecting member 3 is a shaped steel manufactured by hot rolling, and is a standard product based on JIS, for example. In the case of hot-rolled shaped steel, the connecting member 3 is stable without variation in strength regardless of the product, unlike a cast one, so the structural design of the retaining wall 1 is easy, and The required strength of the retaining wall 1 can be reliably secured. The connecting member 3 is formed, for example, by cutting a shape steel to a length of about 50 mm.

Section steels are, for example, channel steel, H-section steel (narrow width), I-section steel, joist steel, and have a web and two flanges formed on one end side and the other end side of the web, respectively. For channel steel, the standard cross-sectional dimensions H×B are 150×75, 180×75, 200×80, etc. In the case of H-section steel (narrow width), the standard cross-sectional dimension 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. One flange (first flange) of the connecting member 3 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 a fixed end flange, and the flange on the side protruding from the support pile 2 (second flange) is a free end flange. In the case of channel steel, the tip of the free end flange is arranged so as to face upward.

A plurality of connection members 3 are installed at intervals on the H-section steel 6 of the support pile 2 , and force is transmitted between the support pile 2 and the wall member 4 at each connection member 3 . The interval 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-section steel 6 . It is desirable to vary the interval between the connecting members 3 according to the earth pressure that the wall member 4 receives. For example, the interval between the connecting members 3 in the lower portion of the wall member 4 is narrower than in the upper portion.

Moreover, the connection member 3 is fixed to each support pile 2 so that all the support piles 2 have the same height in the horizontal direction. The reinforcing bars 7 of the wall members 4 are placed horizontally 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, 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 .

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 shaped steel, has a constant shape. Therefore, in a state in which the connection member 3 is fixed to the flange of the H-section steel 6 of the support pile 2, the reinforcing bar 7 placed on the web of the connection member 3 has an angle with respect to the flange surface of the H-section steel 6 at the installation location. It remains constant regardless. Further, when arranging the reinforcing bars 7 of the wall member 4, the reinforcing bars 7 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. Therefore, the reinforcing bar arrangement work is easy. be. On the horizontal web of the connecting member 3, the intervals between the reinforcing bars 7 can be kept at a predetermined distance and the reinforcing bars can be easily arranged.

In the case where the connection member 3 is channel steel, it is easier to arrange the reinforcement of the wall member 4 when the tip of the flange is arranged upward because the reinforcing bar 7 is less likely to be caught by the flange and fall. 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 arranged downward.

The wall member 4 is in contact with the soil and receives the horizontal component of the soil pressure. The wall member 4 is made of reinforced concrete and installed along the 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 that the wall member 4 receives. The thickness of the wall member 4 is, for example, approximately 200 mm to 250 mm. The design standard 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 with the connection member 3 embedded 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 bars 7 include, for example, a plurality of horizontal reinforcing bars 7a that are main reinforcing bars, and a plurality of vertical reinforcing bars 7b that are, for example, distributing bars. The horizontal reinforcing bar 7a has a diameter of D16, for example, and is arranged on the connecting member 3 in the horizontal direction. The horizontal reinforcing bars 7 a are bound with the connecting member 3 and fixed to the connecting member 3 . The vertical reinforcing bar 7b has a diameter of D13, for example. The vertical reinforcing bars 7b are bound to the horizontal reinforcing bars 7a and fixed to the horizontal reinforcing bars 7a.

Each horizontal reinforcing bar 7a is mounted on the connecting member 3, respectively. Therefore, the interval between the vertical horizontal reinforcing bars 7a in the wall member 4 is equal to the interval between the connecting members 3, and is, for example, about 200 mm to 300 mm. The interval between the horizontal vertical reinforcing bars 7b in the wall member 4 is, for example, about 200 mm to 300 mm. The 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 embedded to a position (underground) below the ground surface on the lower side of the stepped portion. A base beam 8 may be formed at the lower end of the wall member 4 to receive a ground reaction force 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 properties of the ground. By adjusting the penetration depth, it is possible to prevent the phenomenon (circular slip) that the soil (back soil) on the upper side of the stepped portion of the land passes under the retaining wall 1 due to consolidation settlement and pushes up the excavated bottom ground on the lower side of the stepped portion. .

The fixing of the support piles 2 and the connecting members 3 will be described below.
The flanges of the H-section steel 6 of the support piles 2 are fixed to the fixed end side flanges of the connection members 3 so as to come into surface contact with each other. For example, as shown in FIGS. 4 to 6, the support piles 2 and the connecting members 3 are fixed together by joining by arc welding. Members can be joined together by welding work using a generator and welding machine (welder) that is normally used at construction sites, and joining work of connecting members 3 to support piles 2 can be performed quickly and easily on site. can be done. Further, the height position of the connecting member 3 can be easily adjusted by welding work on site.

Moreover, as shown in FIGS. 7 to 9 , the support piles 2 and the connecting members 3 may be fixed to each other by joining with high-strength bolts 9 . The high-strength bolt 9 is, for example, a Torsia-type high-strength bolt (S10T M22), and the tightening torque can be confirmed by breaking the pre-formed pintail at the tip, and the mounting strength is even for a plurality of high-strength bolts 9. can be ensured. Fastening of the high-strength bolt 9 is performed using a shear wrench (for example, an ultra-short type). In the case of joining with high-strength bolts 9, the work can be done only with a 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 flange fixed to the support pile 2 is the protruding tip end flange. is wider than The width of the proximal flange is, for example, 160 mm, and the width of the distal flange is, for example, 50 mm. Further, as shown in FIG. 10, since the inner surface of the flange of the shaped steel is inclined, it is necessary to fasten the high-strength bolt 9 to the flat portion using the tapered washer 10 for shaped steel. The diameter of the through hole 11 formed in the support pile 2 may be a loose hole that is larger than the diameter of the bolt within the range of allowable proof stress. As a result, the installation position of the connecting member 3 in the height direction can be finely adjusted on site.

Next, a method for constructing the retaining wall 1 according to this embodiment will be described.
First, the supporting piles 2 are erected on site. The supporting piles 2 are erected by the pre-boring/cement milk injection compaction method. At this time, by using a construction machine for erection (for example, manufactured by Avolon Systems Co., Ltd.) that can perform excavation, cement milk injection, and erection with one machine, erection can be completed with high accuracy in a short period of time. This construction method has low vibration, low noise, and high mobility, so it can be used for construction in urban areas.

A more detailed description of the erection work of the support piles 2 is as follows, for example. A construction machine for erection is equipped with a plurality, for example three, of lifting hooks and hoists. An excavating auger (drill) of a construction machine moves up and down along a 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, the operation can be completed only by the operator of the construction machine. An auger is then installed for drilling. A hose is connected between the cement milk mixing plant and the rafter provided on the top of the auger.

Also, a steel material called a ruler that serves as a mark of the installation position of the H-shaped steel 6 is marked to determine the core of the pile, and the auger is set based on the marking. After that, the hole is drilled to a specified depth by an auger, and cement milk is injected while the auger is pulled out in reverse rotation. This prevents the collapse of the drilled wall due to the pressure of the cement milk.

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. , is lifted and moved to the top of the borehole and erected in the borehole. A gusset plate for joining with the second H-section steel 6 is joined in advance to the first H-section steel 6 by high-strength bolts. In addition, it is desirable to form through holes for high-strength bolts in the H-section steel 6 before carrying it to the site.

When the H-beam 6 is erected, fine adjustments of the erected position are made by means of optical and laser position measuring instruments and levels. When the top of the H-shaped steel 6 is about 1 m from the ground (GL), the first H-shaped steel 6 is stopped from being erected and removed from the hanging hook. After the second H-section 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-section steel 6 . The second H-beam 6 is inserted between the gusset plates attached to the first H-beam 6 and then tightened with high strength bolts. When the two connected H-section steels 6 are erected as one supporting pile 2 to a predetermined depth, the erecting of one supporting pile 2 is completed. Similar operations are performed on other supporting piles 2 in sequence.

After erecting the support piles 2, if it is necessary to excavate the front of the support piles 2 on a slope, etc., after the horizontal sheet piles are buried in the ground between the support piles 2 before excavation, they are piled in the height direction. , the front side of the support pile 2 may be excavated in the same manner as the construction method of the temporary earth retaining. Moreover, the horizontal sheet pile can also be used as a form for forming the wall member 4 . The horizontal sheet pile does not need to be removed after placing the concrete, and can remain buried in the soil on the rear side of the retaining wall 1 as a part of the wall member 4.例文帳に追加

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

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-section steel 6 in advance at the factory. 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 mounting accuracy of the support pile 2 . In addition, since the H-section steel 6 is transported, carried in, stored, and erected in a state in which the connection member 3 is not fixed, there is an advantage that the H-section steel 6 can be handled without being hindered by the connection member 3. There is an advantage that it is easy to balance when hanging and erecting the section steel 6, and it is easy to hold the H section steel 6 vertically.

After all the connecting members 3 are fixed to the supporting piles 2, reinforcing work for forming the wall members 4 is performed. Since the horizontal reinforcing bar 7a can be placed on the connecting member 3, which is shaped steel, the work is easy. The reinforcing bars 7 of the wall member 4 are arranged by binding the horizontal reinforcing bars 7a with 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 made of cast-in-place concrete. That is, the formwork is erected, the concrete is placed, and the formwork is removed after securing a predetermined concrete strength. Thereby, the structure of the retaining wall 1 in which the wall member 4 is integrated with the supporting pile 2 is completed.

As described above, according to the present embodiment, the reinforced concrete 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 retaining wall 1 has a composite structure in which supporting piles 2 made of H-shaped steel and wall members 4 made of reinforced concrete are integrated. Therefore, the retaining wall 1 can be structurally calculated by the method used for H-shaped steel support piles, shaped steel, and reinforced concrete walls, which are commonly used, and does not require special analysis. It is also possible to calculate by a method defined by laws and regulations. Therefore, in this embodiment, it is easy to confirm the strength.

In contrast, conventional retaining walls made of precast concrete panels are supported at points by metal members such as anchors or tension bolts. Special analysis is required. In this embodiment, compared to a retaining wall made of precast concrete panels, the labor and time required for structural design can be reduced, and the strength of the retaining wall 1 can be presented in a manner that can be easily understood by a third party. .

According to this embodiment, unlike the masonry retaining wall, the vertical wall does not need to be sloped, and unlike the cantilever type retaining wall, the bottom plate protrudes forward or backward from the vertical surface of the vertical wall in the ground. is not embedded. Therefore, since the flat land is not reduced and 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 this embodiment, the connection 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. become. In conventional retaining walls using precast concrete panels, anchors or tension bolts, etc. are connected on the rear side of the panels and supporting piles, so the rear side of the supporting piles is excavated to create a construction space (installation space for temporary scaffolding and work space). space, etc.). On the other hand, in this embodiment, the connection member 3 can be attached and the wall member 4 can be formed on the front side of the support pile 2, and the work on the rear side of the support pile 2 is not necessary. , the space on the rear side of the wall member 4 does not need to be secured beyond the space for installing the support piles 2. - 特許庁

Therefore, if the land behind the retaining wall is 5m higher than the retaining wall and the land in front is lower than the retaining wall on a sloped land, and a flat land is created in front of the retaining wall, any of the conventional construction methods will The wall must be built at least 3m in front of the boundary line 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 supporting piles 2 (for example, 500 mm to 600 mm, which is the excavation diameter of the supporting piles 2) from the adjacent land boundary line.

In addition, since precast concrete panels cannot be post-constructed at joints, in order to install the panels on the support piles, it is necessary to erect the support piles on site with high accuracy in both vertical and horizontal directions. 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 of cast-in-place concrete. 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 depending on the design conditions such as site conditions of the construction site. On the other hand, in this embodiment, since the wall member 4 is made of reinforced concrete formed on site, the retaining wall 1 can be designed and constructed flexibly according to the design conditions.

Furthermore, in this embodiment, since the supporting piles 2 and the wall members 4 are integrated through the connecting members 3 inside the reinforced concrete, the metal members such as anchors or tension bolts at the connecting portions of the panels come into contact with the soil. Unlike the case, there is no risk of deterioration in durability due to corrosion. Furthermore, in this embodiment, since the wall members 4 can be formed from cast-in-place concrete, unlike precast concrete panels, the construction period at the construction site is not affected by the delivery date from the factory, and the cost is greatly reduced. can be suppressed to

In addition, in the present embodiment, shaped steel, reinforced concrete, and the like, which are commonly used as building materials, are used. Techniques requiring precision are not required. Therefore, the retaining wall 1 according to this embodiment can be installed at construction sites under various conditions.

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

Also, a steel material called a ruler that serves as a mark of the installation position of the H-shaped steel 6 is marked to determine the core of the pile, and the auger is set based on the marking. After that, the hole is drilled to a specified depth by an auger, and cement milk is injected while the auger is pulled out with the same rotation as during drilling and the soil is carried out . This prevents the collapse of the drilled wall due to the pressure of the cement milk.

Claims (5)

a plurality of support piles each having a columnar portion formed by cement milk in the ground and an H-shaped steel having a lower portion disposed inside the columnar portion and an upper portion 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, wherein the web is arranged substantially horizontally and the first flange a connecting member having a flange fixed to the H-beam of the support pile;
A wall member formed of reinforced concrete, arranged along the H-beams of the plurality of supporting piles, fixed to the supporting piles via the connecting members embedded therein, and receives a horizontal component of earth pressure. When,
retaining wall. 2. The retaining wall according to claim 1, wherein the reinforcing bars of said reinforced concrete forming said wall member are fixed to said connecting member. The retaining wall according to claim 1 or 2, wherein the section steel of the connecting member is channel steel, I-section steel, joist steel or H-section steel manufactured by hot rolling. The retaining wall according to any one of claims 1 to 3, wherein the H-shaped steel of the supporting pile and the connecting member are fixed to each other by welding or by high-strength bolts. installing a plurality of support piles each having a column formed by cement milk in the ground and an H-beam having a lower portion disposed inside the column and an upper portion exposed from the column;
The web of the connection 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. a step of fixing the first flange of the connecting member to the H-beam of the support pile;
A wall member formed of reinforced concrete, which receives a horizontal component of earth pressure so as to be fixed to the supporting piles via the connecting members embedded therein, along the H-beams of the plurality of supporting piles. arranging;
A retaining wall construction method comprising:

Images