KR102190256B1 - Precast retaining wall having double shear key - Google Patents

Abstract

The present invention relates to a precast retaining wall having shear keys, which can have excellent constructability and reduce a risk of overturn with respect to earth pressure. Provided is the precast retaining wall which includes: a wall part supporting earth and sand; a bottom plate part supporting the wall part to an upper side and supported on the ground at the bottom; and a lower structure having a pair of shear keys protruding from the back and forth of the bottom plate part to a lower side.

Description

Precast retaining wall with double shear key {PRECAST RETAINING WALL HAVING DOUBLE SHEAR KEY}

The present invention relates to the field of architecture, and to a precast retaining wall provided with a shear key capable of reducing the risk of conduction against earth pressure and excellent workability.

In general, a retaining wall is installed in the process of constructing structures such as roads, railroads, river banks, etc. on an inclined part of the ground.

These retaining walls were mainly L-shaped or inverted T-shaped, and were constructed by casting on-site, and concretely, construction is performed through the process of installing reinforcing bars and forms and pouring concrete on the site.

However, in the construction of the concrete retaining wall by casting on-site, there is a problem that the construction period is prolonged and construction cost is excessive because all work to form the retaining wall structure is performed directly on the site. There was a problem that caused inconvenience and increased the risk of safety accidents.

Recently, in order to solve this problem, a method of assembling and constructing an L-shaped or inverted T-shaped precast concrete retaining wall manufactured in advance in a factory is proposed.

1 is a perspective view showing a precast retaining wall of the prior art.

The illustrated precast retaining wall 1 is composed of a bottom plate portion 2 and a wall plate portion 3 installed in a height direction near one end of the top surface of the bottom plate portion 2, and a precast portion at the center side of the bottom plate portion 2 The reinforcing bar 5 is exposed in the space on both sides of the concrete part 2a, so that after assembling the reinforcing unit part 2b, etc., on-site casting is performed.

Retaining walls by this precast method can perform backfilling work and surrounding pavement restoration immediately after the retaining wall is installed, so the construction speed is fast and economical is improved, and it is possible to solve problems of traffic inconvenience or safety accidents that occur during construction. There is an advantage in urban areas or construction requiring urgency.

However, even in the case of a precast retaining wall, it lacks adaptability to the terrain of various heights, and as the height increases, the ability to support the soil remarkably decreases, so a structure capable of reinforcing this is required.

Korean Patent Publication No. 10-1206344 discloses a precast retaining wall panel. In the case of such a precast retaining wall panel, in order to overcome the limitations of the prior art, a tension member and a fixing member are used to improve stability. However, in this case, there is a problem in that the structure is complex and workability is poor.

The present invention was conceived to solve the above problems, and an object of the present invention is to provide a precast retaining wall with improved supportability and rigidity for the ground and excellent workability.

The precast block of the retaining wall according to the present invention is a bottom plate portion 110 supported against the ground or foundation, a wall portion 170 connected in a vertical direction from the bottom plate portion, and protruding from the bottom plate portion to the front and rear sides. It provides a precast retaining wall having a double shear key including a rear shear key 141 and a front shear key 142 formed to be spaced apart.

A connection portion 123 having an outer surface obliquely extending forward and backward from the lower end of the wall portion, a flat surface portion 122 extending flat from the end of the connection portion in the front and rear, and extending obliquely downward from the edge of the flat surface toward the bottom plate portion It is preferable to include a connection structure including the slope portion 121 and having a hollow portion 124 therein.

The front shear key may be formed to have a larger thickness in the front and rear than the rear shear key disposed in a direction supporting soil.

In addition, the front shear key and the rear shear key may be arranged at an interval equal to or less than the interval between slopes connected to the bottom plate in the front and rear.

The wall portion includes at least one insertion portion 150 penetrating in the left and right direction so that the tension member 101 can be connected between the adjacent wall portion, and the insertion portion includes an insertion hole through which the tension member is disposed, and the An opening of the insertion hole may be formed, but an inlet portion having a diameter extending toward the outside may be provided.

In addition, a body 210 having a cylindrical shape corresponding to the inner diameter of the insertion hole, a through hole 220 through which a tension member passes through the inner circumference of the body, and a portion of the body protrude in the outer circumferential direction, and are inserted and adhered to the inlet. A joint that is provided with a protrusion 230 and a wire 240 disposed inside the body and corresponding to the length of the body and arranged circumferentially at equal intervals to surround the through hole, and inserted into the inlet of the wall adjacent to each other A member 200 may be further included.

It is preferable that the joint member is press-fitted while being deformed in correspondence with the position of the inlet portion, but when tension is provided to the tension member, the wall portions facing each other are compressed and compressed so that moisture penetrating through the insertion portion does not contact the tension member.

The precast retaining wall having a double shear key according to the present invention includes a wall portion and a lower structure, but has at least a pair of shear keys protruding downward, so the risk of conduction is significantly reduced, and structural stability and durability are improved. have.

In addition, since a plurality of precast blocks can be connected and arranged, the construction period is remarkably shortened and there is no need for additional construction for structural reinforcement, thereby improving economic efficiency.

1 is a perspective view showing a retaining wall of the prior art.
Figure 2 is a perspective view of a precast retaining wall having a double shear key according to a basic embodiment of the present invention.
3 is a side view for explaining an additional embodiment of a precast retaining wall having a double shear key of the present invention.
Figure 4 is a front cross-sectional view for explaining an embodiment of the wall portion in the precast retaining wall having a double shear key of the present invention.
5 is a perspective view showing a joint member according to a first embodiment of the present invention.
6 is a perspective view showing a joint member according to a second embodiment of the present invention.

Hereinafter, a precast retaining wall having a double shear key according to the present invention will be described in more detail with reference to the accompanying drawings.

In the case of the precast retaining wall according to the concept of the present invention, it can be applied not only to the retaining wall used for preventing the collapse of soil or the composition of the site on a slope, but also to various structures constituting a predetermined wall surface. In addition, the shape of the precast block of the present invention is not limited to the illustrated examples, and may be variously modified as long as it includes a bottom plate portion supported with respect to the ground and a wall portion substantially erect.

The present invention is basically a precast made of a lower structure comprising a wall portion supporting soil, a bottom plate portion supporting the wall portion upward and supported by the ground from the bottom portion, and a pair of shear keys protruding downward from the front and rear of the bottom plate portion. Provide retaining walls.

In the description of the present invention, the direction in which the wall portion is extended is the height direction, the width direction of the bottom plate portion is the length direction, and the direction in which the shear keys are arranged is defined and used for the lower structure including the bottom plate portion and the shear key.

Figure 2 is a perspective view of a precast retaining wall having a double shear key of the present invention.

The wall part 170 is made in a vertical plate shape as a whole and functions to support the soil or the wall on one surface. The wall part 170 is preferably made of concrete including reinforcing bars, but the material is not necessarily limited thereto. In addition, such a wall portion 170 is formed in a manner that is precast in the production process together with the bottom plate portion 110 and the shear keys (141, 142) ㄹ the lower structure 120 including the lower structure and transferred to the construction site. Retaining walls may be formed in a manner that is coupled to both sides or one side. In this case, since the time period is shortened and the inputted manpower and resources are small, economic efficiency can be improved.

In the description of the present invention, the inverted T-type retaining wall is described as a basic embodiment, but the concept of the present invention can also be applied to types such as gravity type, anti-gravity type, b-type retaining wall, buttress-type retaining wall if it has a bottom plate portion 110. There will be.

The lower structure 120 is provided as a lower support structure of the wall part 170, and the case where the lower structure 120 is directly connected to the bottom plate part 110 to support the wall part 170 at the top will also be considered. However, it is preferable to further provide a connection structure in consideration of reinforcement of the stress in the front and rear directions. This connection structure will be described in more detail below.

The bottom plate portion 110 extends substantially in a horizontal direction in the front and rear and left and right directions from the lower side of the wall portion 170 so that the bottom surface can be supported with respect to the ground or foundation, and preferably may be formed in a substantially plate shape.

A trapezoidal connection structure including a hollow part 124 may be further disposed as a form connecting the lower end of the wall part 170 and the upper surface of the bottom plate part 110, and such a connection structure is a buttress-type retaining wall In the structure, the earth pressure is distributed to the bottom plate portion 110 to further improve the supporting force.

Specifically, the connection structure, which is the upper structure of the lower structure 120, has a connection part 123 having an outer surface that extends obliquely forward and backward from the lower end of the wall part 170, and the connection part 123 that extends flatly in the front and rear from the end of the connection part 123. A flat surface portion 122 and a slope portion 121 extending downwardly inclined toward the bottom plate portion 110 from the edge of the flat surface portion 122, the flat surface portion 122, the slope portion 121 and the bottom plate portion (110) is formed to form a trapezoid in the form of surrounding the hollow portion 124.

The bottom plate 110 may be formed in a plate shape having a predetermined thickness as described above, and may be connected to a pair of shear keys protruding downward from the front and rear, and the rear shear key 141 disposed at the rear and the front It can be defined as the arranged front shear key 142, and this direction can be changed according to the location and direction of construction.

The rear shear key 141 and the front shear key 142 are disposed in a form inserted into the ground or foundation downward, and perform a function of reinforcing shear force while the bottom surface of the bottom plate portion 110 is supported by the ground or foundation. . For example, when earth pressure is generated toward the side where the rear shear key 141 is disposed, a rotational moment is generated in the front as a force is applied to the rear surface of the wall unit 170, and the frictional force is generated from the surface of the bottom plate unit 110. When the limit is reached, if the shear key is absent, the entire precast block 100 is pushed out or overturned.

Specifically, according to the action of earth pressure from the rear, the front edge side of the bottom plate portion 110 becomes the center of rotation, and the moment acts in the direction in which the rear edge side is lifted. There is a limit to support the overall shear force at the front edge of the.

The pair of shear keys performs a function of distributing such shearing force, and in the same example, the front edge of the bottom plate portion 110, the lower front and rear edges of the front shear key 142 inserted into the ground, and the Both the front and rear edges of the rear shear key 141 support the force, and the amount of soil or material forming the foundation disposed therebetween can be guaranteed to some extent, thereby dramatically reducing the risk of fall.

In this embodiment, it is made in a symmetrical shape with respect to the center of the front and rear, but in the case of a retaining wall that supports earth pressure only from the rear, it may be preferable that the protruding direction of the shear keys is inclined toward the rear as it goes downward.

In addition, when the rear shear key 141 is formed longer than the front shear key 142, it is more advantageous in terms of power distribution.

The positions in which the front shear key 142 and the rear shear key 141 are disposed are optional, but are preferably disposed to be spaced apart from the end to some extent in the front and rear center direction so that the bottom plate portion 110 protrudes from the front and rear sides.

It is preferable that the front shear key 142 and the rear shear key 141 are formed adjacent to the connection portion between the bottom plate portion 110 and the slope portion 121 to ensure structural stability. In a preferred embodiment, the distance between the front front key 142 and the rear front key 141 may be less than or equal to the distance of the slope portion 121 connected to the bottom plate portion 110.

On the other hand, each of the precast blocks 100 may be connected to the left and right to form a retaining wall as a whole, and in some cases, it is not excluded that they are disposed as a single unit.

An insertion portion 150 into which a tension member such as a steel wire (101 in FIG. 4) may be inserted through the left and right directions of the wall portion 170 may be formed,

The tension member may be preferably made of any one selected from PS tension member 101, PS steel wire, PS steel bar, or continuous fiber reinforcement, but members of various shapes and materials may be selected if they can provide prestress by tensile force. I can.

This tension member functions to improve the rigidity of the retaining wall by connecting the adjacent precast blocks 100 to each other to improve the mutual fastening force.

The tension members may be arranged in an optional number on the wall part 170 and/or the lower structure 120, and in some cases, the wall part 170 to improve the fastening force between the precast blocks 100 And/or the lower structure 120 may have a concave-convex structure on the side surface thereof, and in this regard, various known fastening protrusions and groove structures may be applied.

In a preferred embodiment, the insertion part 150 is basically any one disposed on the wall part 170, but at least one is formed at the connection part between the wall part 170 and the lower structure 120, structural stability It is desirable for

3 is a side view for explaining an additional embodiment of a precast retaining wall having a double shear key of the present invention.

In the above-described embodiment, the description has been made on the basis of a symmetrical shape in the front and rear, but when a space is to be allowed in an outer periphery of one of the front and rear, the protrusion of the bottom plate 110 may be restricted.

Therefore, in this embodiment, the end of the bottom plate portion 110 protrudes from the rear side supporting the earth pressure, and the rear shear key 141 is disposed at intervals from the end to the center side, but the front shear key is of the lower structure 120 It is arranged in a form extending directly from the slope portion 121. This case is defined as the block shear key 143.

The block shear key 143 may directly form an outer wall surface, and in this case, it is formed with a larger width than the rear shear key 141 because it may be more disadvantageous than the basic embodiment in the action of shear force by the application of earth pressure. It is desirable to be.

In this case, the case where the slope portion 121 is formed in an upright shape similar to the front of the block shear key 143 may be considered.

Figure 4 is a front cross-sectional view for explaining an embodiment of the wall portion in the precast retaining wall having a double shear key of the present invention.

The insertion part 150 may include an inlet part 151 that is an inlet side and an insertion hole 152 having an inner diameter substantially corresponding to the outer diameter of the tension member 101. It is preferable that the diameter of the inlet portion 151 that is the opening of the insertion portion 150 is larger than the diameter of the insertion hole 152.

The joint member 200 is inserted into the inlet portion 151, and the joint member 200 has a protrusion formed so that the outer diameter of a portion thereof is larger than that of other body portions, as will be described later, and is formed in the inlet portion 151. It can be combined in a way that is press-fit while being deformed. Therefore, it is preferable that the inlet portion 151 has an inclined shape whose diameter increases toward the inlet side.

On the other hand, the inlet portion 151, which is an opening, may be disposed at the other end that is opposite to the inlet portion 151, and insertion of the tension member 101 and the joint member 200 is considered. However, considering the convenience of insertion and construction of the protrusion, the opening at the other end can be made to correspond to the diameter formed inside the body.

As shown, a part of one side of the joint member 200 is inserted into the other end of the precast block 100 on one side, and the protrusion of the joint member 200 is inserted into the inlet portion 151 of the precast block 100 on the other side. Interconnection is made in the inserted state, and the tension member 101 is disposed therethrough to provide a compressive force.

5 is a perspective view for explaining the first embodiment of the joint member.

The joint member 200 is disposed at the inlet portion 151 of the precast block 100 to be connected to each other, and can be inserted into the inlet portion 151 formed on one side of the insertion hole 152 and the opening on the other side. As described above. Accordingly, the joint member 200 has a body 210 having a cylindrical shape as a whole, and the body 210 has an outer diameter of approximately the inner diameter of the insertion hole 152 or any one or more ends of the insertion hole 152 It may correspond to the inner diameter of the side opening.

This joint member 200 includes through-holes 220 penetrating both sides, and the through-hole 220 is through which a tension member 101 is inserted into an insertion hole 152 formed in the precast box body. . The inner diameter of the through-hole part 220 corresponds to the outer diameter of the tension member 101, and thus, the joint member 200 of various shapes corresponding to the inner diameter of the insertion hole 152 and the outer diameter of the tension member 101 according to the construction environment. ) May be provided.

A portion of the body 210 of the joint member 200 is formed with a protrusion 230 protruding in the outer circumferential direction, and the protrusion 230 may be formed in an approximately one or more ring shape. The protrusion 230 is inserted into the insertion unit 150 and is in close contact with each other, thereby preventing the inflow of moisture to the tension member 101 and performing a function corresponding to vibration and deformation of the ground in the installation environment.

The arrangement position of the protrusions 230 and the number and shape of the protrusions are optional, but it will be preferable for insertion into the insertion hole 152 to be made in the form of a thread. However, a case in which a plurality of rings are arranged at equal intervals may also be considered.

The joint member 200 is made of an elastic material as a whole, and can perform the function of sealing to prevent the penetration of moisture into the insertion hole 152, and preferably made of a rubber material, but is limited thereto. no.

6 is a perspective view showing a joint member according to a second embodiment of the present invention.

The joint member 200 has a cylindrical shape as a whole, and may perform a function of absorbing an impact in response to the mutual movement of the precast block 100 in the insertion unit 150. However, it would be desirable to be made of a material having excellent durability and elasticity because there is a concern that durability may be weakened due to various vibrations and subsidence in the ground. In an additional embodiment of the present invention, a method in which a wire 240 made of a metal material is disposed so as to improve durability inside the body 210 is proposed.

The wire 240 may be formed to correspond to the length of the body 210, and may be arranged at equal intervals in an annular shape to surround the through-hole 220 as shown.

In the above-described embodiments, the protrusion 230 of the joint member 200 may approximately correspond to the position of the inlet 151, and the body 210 may be inserted into the insertion hole 152 at both sides. ) May be exposed.

In an embodiment in which an inlet portion 151 is formed on one side of the precast block 100 and an opening corresponding to the insertion hole 152 is formed on the other side, the arrangement length of the protrusion portion 230 is that of the inlet portion 151 It would be desirable to be somewhat longer than the length. In this case, when the protrusion part 230 is completely inserted into the inlet part 151 during the insertion process, a part is exposed, and the part exposed in the compression process through the tension member is deformed to completely seal the adjacent opening parts.

As another embodiment, when the inlet portions 151 are formed on both sides of the precast box 100, the protrusions 230 may be formed to have a length of at least twice the length of the inlet portion 151 and remain on the center side. It will be possible to perform sealing while the portion is compressed and deformed by the compression force by the tension member.

According to the present invention, since the wall portion and the lower structure are included, but at least one pair of shear keys protruding downward is provided, the risk of conduction is significantly reduced, structural stability and durability are improved, as well as a plurality of precast blocks. The construction period is remarkably shortened and the need for additional construction for structural reinforcement is eliminated, so economic efficiency is improved.

In the above, the present invention has been described in detail based on the embodiments and the accompanying drawings. However, the scope of the present invention is not limited by the above embodiments and drawings, and the scope of the present invention will be limited only by the contents described in the claims described later.

100... precast block 101... tension member
110... bottom plate 120... substructure
121... slope part 122... flat surface part
123...connection 141...rear front key
142...Front shear key 143...Block shear key
150...Inlet 151...Inlet
152...insertion hole 170...wall part
200... joint member

Claims (6)

Bottom plate portion 110 supported on the ground or foundation;
A wall part 170 connected in a vertical direction from the bottom plate part;
A rear front key 141 and a front front key 142 protruding from the bottom of the bottom plate and spaced apart from the front and rear sides;
A connection portion 123 having an outer surface obliquely extending forward and backward from the lower end of the wall portion, a flat surface portion 122 extending flat from the end of the connection portion in the front and rear, and extending obliquely downward from the edge of the flat surface toward the bottom plate portion A precast retaining wall having a double shear key including; a connection structure including a slope portion 121 and having a hollow portion 124 therein.
The method of claim 1,
The connection structure distributes the earth pressure to the bottom plate,
The rear shear key and the front shear key, a precast retaining wall having a double shear key for reducing the risk of falling by distributing the earth pressure applied from the rear from the front edge side of the bottom plate.
The method of claim 1,
The front shear key,
A precast retaining wall having a double shear key that is formed with a larger thickness in the front and rear than the rear shear key arranged in a direction to support soil.
The method of claim 2,
The front front key and the rear front key,
A precast retaining wall having double shear keys arranged at an interval equal to or less than the interval between slopes connected to the bottom plate in the front and rear.
The method according to any one of claims 1 to 4,
The wall part,
It includes one or more insertion portions 150 penetrating in the left and right directions so that the tension member 101 can be connected between the adjacent wall portions,
The insertion part,
A precast retaining wall having a double shear key having an insertion hole through which a tension member is disposed and an opening of the insertion hole, but having an entrance portion whose diameter increases toward the outside.
The method of claim 5,
A body 210 having a cylindrical shape corresponding to the inner diameter of the insertion hole, a through-hole 220 through which a tension member passes through the inner circumference of the body, and a protrusion protruding from a part of the body in the outer circumferential direction and inserted into and in close contact with the inlet (230) and a joint member disposed inside the body, corresponding to the length of the body, and having wires 240 arranged circumferentially at equal intervals to surround the through hole, and inserted into the inlet of the adjacent wall portion ( 200); further includes,
The joint member,
Precast retaining wall with a double shear key that prevents moisture penetrating through the insertion part from contacting the tension member by being pressed in while the protrusion is deformed and deformed, but when tension is provided to the tension member, the wall parts facing each other are compressed and compressed to prevent contact with the tension member. .

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