KR20040097801A - Prefabricated retaining wall system installed a tension member - Google Patents

Abstract

PURPOSE: A prefabricated retaining wall having tensile members is provided to reduce the construction cost, to quickly and simply execute construction, and to reduce a term of works, by interconnecting a perpendicular wall body and a bottom slab member and installing the tensile members in a state of introducing prestressing. CONSTITUTION: A prefabricated retaining wall having tensile members(400) includes a bottom slab member(200) and a perpendicular wall body(300). The perpendicular wall body includes post members(310) formed to the bottom slab member at a predetermined interval and a precast rear member(320) inserted between the post members. The tensile members are formed to the perpendicular wall body and the bottom slab member. One end of the tensile member is tensed and fixed to the perpendicular wall body while the other end is fixed to the bottom slab member. External force acting on the perpendicular wall body and the bottom slab member is compensated by prestressing introduced by the tensile members.

Description

Prefabricated retaining wall system installed a tension member

The present invention relates to a prefabricated retaining wall system having a tension member. More specifically, as a retaining wall system for preventing collapse of the earth structure by the flow of the backing soil, a vertical wall including a precast backing member inserted between a bottom plate member formed on the ground and a pillar member provided on the bottom plate member is provided. And the bottom plate member and the vertical wall body provide a retaining wall system in which the retaining wall is prefabricated by installing a tension member so that prestress is introduced and connected to each other.

Reinforced concrete retaining wall for conventional civil engineering is because the bending moment acting on the retaining wall by the backing soil is approximately increased in proportion to the third square of the retaining wall height, inevitably to secure the rigidity against the bending moment The cross-sectional area and the amount of reinforcing bars in the wall were greatly increased with the height of the retaining wall.

Therefore, when the height of the retaining wall is usually less than 8M, an inverted T-shaped retaining wall or an L-shaped retaining wall is used, and when the height exceeds 8M, it is perpendicular to the bottom plate member 10 including the back plate 1 as shown in FIG. The subwall retaining wall 100 in which the subwall 30 is formed in the oblique direction of the wall 20 is used.

Since the subwall retaining wall shares the stress (bending moment) against the external force acting on the vertical wall and the heel plate, the cross-sectional size of the vertical wall and the bottom plate member, especially the heel plate, and the amount of reinforcing bars are inversely T-shaped or L-shaped. While there is an advantage that can be relatively reduced compared to the retaining wall, it was difficult to install the inclined buttress wall as a reinforced concrete member.

In other words, in order to effectively counter the bending moment, the cross-sectional configuration of the inclined sub-wall is wider and the narrower toward the top is adopted. Particularly, in the case of the upper sub-wall, the concrete is placed inside the formwork where the reinforcing bar is reinforced. As it is not easy, compaction work is not easy to ensure that the concrete is tightly filled in the formwork, and there are construction difficulties in that the form assembly and the number of concrete castings have to be divided several times to complete the subwall retaining wall. However, since the concrete is poured several times inevitably there is a problem that efficient concrete quality control is difficult.

In addition, the cost of forming buttresses, ie, the amount of concrete and expensive rebars, was increased, which contributed to the increase in construction costs.There are many cases of defects caused by difficulties in construction, requiring continuous maintenance, and the risk of retaining wall collapse due to poor construction. Existed.

An object of the present invention is a member having a function of a sub-wall in the retaining wall, but connecting the vertical wall and the bottom plate member to each other, by providing a tension member so that the prestress is introduced, it has the characteristics of the sub-wall retaining wall, the vertical wall and the bottom plate member The construction cost can be reduced by reducing the cross-sectional size and the amount of used rebar, and by precasting the back members installed between the pillar members constituting the vertical wall and installing them in a prefabricated manner, it is faster and easier to install, thereby saving air. To provide a retaining wall system that can be.

1 shows a conventional subwall retaining wall,

Figures 2a, 2b and 2c shows a specific example of the retaining wall system of the present invention according to the bottom plate member and the tension member when the pillar member is a reinforced concrete member,

2d, 2e and 2f show a specific example of the retaining wall system of the present invention according to the bottom plate member, the tension member and the precast back member when the pillar member is a steel frame member,

Figure 2g shows a cross-sectional view of the retaining wall system of the present invention.

3A and 3B illustrate a connection state of the precast back member when the pillar member of the present invention is a reinforced concrete member or a steel frame member.

4A and 4B show partial details in which the tension member of the present invention is fixed to a steel member or a reinforced concrete member which is a pillar member.

<Description of Major Reference Drawings>

200: bottom plate member

210,220,230: Press plate, back plate, connecting plate of bottom plate member

300: vertical wall

310: pillar member

310a, 310b: Reinforced concrete member and steel member

320: precast back member

400: tension member

According to the present invention, a vertical wall body 300 including a bottom plate member 200 installed on the ground, a pillar member 310 formed on the bottom plate member, and a precast back member 320 installed between the pillar members. And tension members 400 which both end portions are tensioned and fixed to the bottom plate member and the vertical wall to introduce compression prestress, and to external forces acting on the vertical wall and the bottom plate member by compression prestress introduced by the tension member. By countering the structural efficiency with respect to the structure, it is possible to reduce the size of the cross-section of the vertical wall and the bottom plate member, reduce the amount of used reinforcing bars to be disposed therein, and be inserted between the pillar members constituting the vertical wall. Technical features that the retaining wall can be fabricated prefabricated by manufacturing and installing the back member to a certain standard in the factory, the best of the present invention An embodiment of the present invention will be described in detail with reference to FIGS. 2 to 4.

Figures 2a, 2b and 2c shows an example of the installation position of the tension member according to the bottom plate member using a reinforced concrete pillar member as the pillar member in the retaining wall system of the present invention, Figures 2c, 2d and 2e In the retaining wall system of the present invention, a steel member is used as the pillar member, and an example of the installation position of the tension member according to the bottom plate member is shown, and FIG. 2F shows a cross-sectional view of the retaining wall system of the present invention.

The bottom plate member 200 is a plate-shaped member installed on the ground on which the retaining wall is to be installed. The bottom plate member 200 supports the vertical load of the backing soil formed on the rear wall of the retaining wall, and the front hoof plate 210 and the heel as shown in FIGS. 2A and 2D. It may be formed including a plate 220, the connecting plate 230, it can be produced in one plate in a rectangular parallelepiped shape as shown in Figures 2b, 2c, and 2e, is selected and manufactured according to the site conditions, design .

In the present invention will be described with reference to Figure 2a showing the bottom plate member 200 composed of the three plates (front plate, rear plate, connecting plate).

In the case of the bottom plate member, the front plate, the connecting plate and the rear plate can block out the inside, thereby reducing the amount of concrete and the used reinforcing bar. Rigidity sufficiently resistant to external force can be ensured by installation of a tension member described later.

The portion formed on the portion where the rearing soil is formed based on the vertical wall 300 is the rear hoof plate 220, and the portion where the vertical wall 300 is formed is called the front hoof plate 210 for convenience. The lower part of the pillar member 310 of the wall 300 is connected to the connection plate 230 to the rear heel plate, and one end of the tension member 400 is fixed to the connection plate 230 (back heel plate or a connection plate). The other end of the tension member is to be settled after the tension to the pillar member (310).

The bottom plate member 200 of the present invention including the front heel plate 210, the rear heel plate 220, the connecting plate 230 can be manufactured using formwork and concrete in the field, the pillar member 310 is reinforced concrete In the case of manufacturing the member, it is preferable that the bottom plate member 200 and the pillar member 310 are integrally manufactured. Of course, the bottom plate member 200 is first manufactured in the field, and the pillar member 310 may be separately installed on the front plate 210 of the bottom plate member, and the pillar member 310 may be manufactured at the factory (precast). It may be installed on the bottom plate member 200 manufactured in the field.

One end of the plurality of tension members 400 installed inclined to the connection plate 230 or the rear plate or the connection plate and the rear plate is fixed.

The vertical wall 300 includes a pillar member 310 installed vertically on the bottom plate member 200 and a precast back member 320 inserted between the pillar members. This vertical wall is a structure that is supported by the bottom plate member to counteract the earth pressure caused by the backing soil.

The pillar member 310 may be installed at a predetermined interval on the bottom plate member, and may be installed by setting the gap and height in consideration of the width and length of the precast back member at the factory.

The pillar member 310 may use a reinforced concrete member 310a or a steel frame member 310b, all of which may use a factory manufactured product. 2A, 2B and 2C show a case where the reinforced concrete member is used as the pillar member.

The pillar member 310 is fixed after the other end is tensioned by the fixing device while one end of the tension member is fixed to the bottom plate member. As a result, the compressive stress is introduced while the vertical wall and the bottom plate member are connected to each other. This compression prestress can structurally offset the external force such as earth pressure of the backing soil and the vertical wall and the bottom plate member can reduce the cross-sectional size and the amount of reinforcing bar required for the manufacture of the vertical wall and bottom plate member including the column member.

The compression prestress introduced by the tension member is the most economical, efficient design and construction in consideration of the ease of installation of the tension member, the fabrication of the tension member and the vertical wall, the installation cost, and the size of the flooring load acting on the soil. The timing of introduction, the number of times of introduction (can be introduced one or more times), the size of the introduction amount, the order of introduction, etc. may also be determined in consideration of the earth pressure (coarse, manual earth pressure), site conditions, and workability. .

In the case of using the reinforced concrete member 310a as a pillar member, it may be manufactured and installed by precasting, or may be manufactured directly in the field when the bottom plate member is manufactured by pouring concrete in the field.

When the steel frame member 310b is used as the pillar member, steel materials such as H-shaped steel or I-shaped steel may be used as shown in FIGS. 2C, 2D, and 2E. The lower portion of the steel frame member is inserted into the bottom plate member 200 is fixed. At this time, when the tension member is tensioned and fixed to the pillar member, which is a steel member, the vertical compressive prestressing force introduced into the steel member acts on the steel member, so that the steel member can cause excessive stress concentration while digging into the bottom plate member. In order to install the horizontal support member in the lower portion of the steel member as shown in Figure 2d through the horizontal support member 311b or separated to protrude to both sides.

The precast back member 320 is a member inserted and installed between the pillar members 310 and has a function of resisting earth pressure due to the backing soil together with the pillar member. In order to be inserted and installed between the pillar members, a portion where the pillar member and the precast back member are connected to each other may be formed as shown in FIGS. 3A and 3B.

3A illustrates a case in which a reinforced concrete member 310a is used as the pillar member 310, the front surface of the pillar member (shown in FIG. 3A is formed on the front surface, but may also be formed on the rear surface). To form a flange portion, and to produce the shape of both ends of the precast back member 320 corresponding to the flange portion so that the flange portion can be inserted into the flange portion, the pillar can be easily used without using a separate connecting member. A precast back member can be provided between the members. The shape of the connection portion of the pillar member and the precast rear member may be variously changed. When the earth pressure of the rear soil acts on the rear member, both ends of the rear member are supported by the flange portion of the pillar member and the pillar member and The precast back member is integrally able to resist the earth pressure.

FIG. 3B illustrates a case in which a steel frame member 310b such as an I-shaped steel is used as the pillar member 310, and a precast back member 320 having a rectangular parallelepiped shape is not required to form a flange portion like a reinforced concrete member. ) Is easily inserted between the flanges of the steel member, so that the pillar member and the back member, which are steel members, can be integrally supported by earth pressure.

The precast back member 320 is manufactured using a reinforced concrete product made in a predetermined size and cross section at the factory, so that the vertical wall body 300 can be manufactured simply by installing on a pillar member in the field. The workability is greatly improved, and the formation of a fast vertical wall can be performed, which can have an effect of reducing air.

Furthermore, when using a lightweight panel made of a composite material is reduced in weight has the advantage that it is very easy to transport and install. Lightweight concrete panels may be used as such panels, and steel panels may be used instead of concrete products.

The tension member 400 connects the vertical wall and the bottom plate member to each other in the present invention, but is fixed to the vertical wall after being fixed to one end of the bottom wall member so that the compression wall is introduced into the vertical wall and the bottom plate member. Has the function.

As shown in FIG. 2G, a plurality of fixing means 231 is formed at a lower portion of the connecting plate 230 of the bottom plate member so that one end of the tension member 400 may be fixed. One end of the connecting tube 231a and the tension member to be inserted may be constituted by an anchor receiving portion 231c fixed by an anchor head 231b or the like, and other conventional fixing means may be used.

In the state where one end is fixed to the bottom plate member, the other end of the tension member may pass through the bottom plate member formed in the pillar member 310a and be fixed after tension by using the fixing device 231d on the front surface of the pillar member. 2G may be manufactured by inserting a connecting tube in advance when manufacturing the bottom plate member as shown in FIG. 2G. Alternatively, the through hole may be formed in advance without installing the connecting tube. When the fixing device is exposed on the front surface, it may not look good, so that the fixing device may be formed using a mortar or the like so that the fixing device is not visible from the outside, or a separate panel may be attached.

In the state in which one end of the plurality of tension members 400 is fixed to each connecting plate 230 formed at a predetermined interval as shown in Figure 2a, a plurality of tension members 400 at intervals up and down of the pillar member 310a. The other end of) may be fixed.

4A illustrates a specific example of fixing the other end of the tension member to the steel member when fixing the other end of the tension member when the steel member 310b is used as the pillar member 310.

That is, the inclined support plate 313 is manufactured and installed separately between the flanges of the steel member, and a hole is formed in the center portion of the inclined support plate, and the tension member 400 is installed to penetrate the steel member, such as an anchor head. It is preferable to fix the other end of the tension member to the inclined support plate by using the fixing device 312b. In other words, the vertical component of the compression prestress to be introduced is formed along the central axis of the steel member, so that the vertical component of the compression prestress is not eccentric to the steel member.

4B illustrates a specific example of fixing the other end of the tension member to the concrete pillar member when fixing the other end of the tension member when the concrete pillar member 310b is used as the pillar member 310.

That is, the fixing portion 231d is formed to fix the other end of the tension member in a predetermined shape, and the reinforcing plate and the anchor in the state in which the other end of the tension member protrudes through the pillar member. The other end of the tension member 400 is fixed to the pillar member after the tension using the fixing device 312b such as a head.

Since the tension member is installed in the vertical wall 300 formed of the precast back member 320 installed in the pillar member 310, the size of the cross section of the vertical wall and the bottom plate member and the amount of used rebar can be reduced. For example, in the case of the vertical wall, the cantilever structure having one end fixed to the bottom plate member is a conventional design method that resists the main earth pressure caused by the backing soil. However, in the present invention, the tension member is installed up and down on each vertical wall. When the compressive prestress is introduced, it resists earth pressure due to the soil, so the total height of the vertical wall is significantly reduced in bending moment and shear force that resists soil pressure of the soil, compared with the cantilever. By doing so, the size of the cross section of the vertical wall can be reduced accordingly, and the amount of used reinforcing bars that are placed inside can be reduced. There is an advantage.

Further, in the case of the bottom plate member 200, a cantilever structure in which one end is fixed to the vertical wall is also a conventional design method that resists vertical earth pressure due to the self-load and the load of the backing soil. When the compression prestress is introduced to the bottom plate member to the left and right side, it resists the vertical earth pressure of the self soil and the overload of the backing soil. By significantly reducing the magnitude of the bending moment and the shear force, the bottom plate member can be designed, thereby reducing the size of the cross section of the bottom plate member and reducing the amount of used reinforcing bars.

FIG. 2C shows another example of the tension member 400 which is fixed to the precast back member installed when the reinforced concrete member 310a is used as the pillar member 310.

That is, as shown in Figs. 2a and 2b, the tension member can be installed on the pillar member which is the reinforced concrete pillar member, and can also be installed on the precast rear member.

In addition, FIG. 2E shows another example of the tension member 400 fixed to the precast back member installed when the steel member 310b is used as the pillar member 310.

That is, as shown in Figure 2d, the tension member may be installed on the pillar member, which is a steel member, and may also be installed on the precast rear member.

FIG. 2E shows another example of the tension member 400 fixed to the precast back member installed when the steel member 310b is used as the pillar member 310.

That is, the precast rear member 320 is inserted between the steel member 310a, which is the pillar member 310, and is installed. At the bottom, the precast rear member 321 having a predetermined height is first installed, and then the The intermediate back member 322 is inserted thereon, and the precast back member 323 is installed thereon. The rear member is dividedly installed for the convenience of transportation and construction when the height of the rear member is large. In particular, the middle rear member can be installed using a steel member as shown in FIG. 2D. Can be installed with any change.

The other end of the tension member 400 may be fixed to the intermediate back member 322, and in this manner, the tension member may be easily installed on the precast back member as well as the pillar member.

In this way, instead of widening the spacing of the pillar members, an additional tension member is installed between the pillar members in order to more effectively resist the earth pressure caused by the soil, or the pillar member is not provided with a tension member. Only when it is necessary to install the tension member is a method that can be used.

According to the present invention, a vertical wall and a bottom plate member having a precast rear member installed between the pillar members are connected to a tension member, so that an external force such as earth pressure of the backing soil acting on the vertical wall and the bottom plate member is introduced into the retaining wall by the tension member. By offsetting, it is possible to reduce the size of the cross-section of the vertical wall and the bottom plate member, thereby reducing the amount of reinforcing steel reinforcement therein, making it possible to manufacture and install an economical retaining wall. By precasting and manufacturing, the workability is improved, and the air can be reduced, so that a highly efficient retaining wall can be installed.

Claims (7)

In the retaining wall including the bottom plate member and the vertical wall, The vertical wall includes a precast rear member inserted between the pillar member and the pillar member formed at predetermined intervals in the bottom plate member, and the other end is vertical while the other end is fixed to the bottom plate member. A tension retaining wall system having a tension member, comprising: forming a tension member to be fixed after tension on a wall to offset external forces acting on the vertical wall and the bottom plate member by prestress introduced by the tension member. The prefabricated retaining wall system according to claim 1, wherein the precast back member is a lightweight panel made of a composite material. The prefabricated retaining wall system having a tension member according to claim 1, wherein the pillar member is manufactured and installed as a precast member as a reinforced concrete member. The prefabricated retaining wall system according to claim 1, wherein the pillar member is a steel frame member which is an H-beam or an I-beam. According to claim 4, Precast back member provided between the pillar member which is the steel member is formed integrally inserted or at least two or more segmented precast member, the intermediate rear between the segmented precast rear member Prefabricated retaining wall system having a tension member, characterized in that the member is formed and inserted. 5. The prefabricated retaining wall system according to claim 4, wherein a horizontal support member is formed at a lower end of the steel member which is the pillar member. The other end of the tension member, which is fixed to the vertical wall, is formed in the intermediate rear member formed between the pillar member of the vertical wall or the segmented precast back member, or both. Prefabricated retaining wall system is formed with a tension member, characterized in that formed.