KR20110132910A - Underpass using precast concrete pile and bottom slab and method for constructing the same - Google Patents

Abstract

PURPOSE: An underpass using precast concrete piles and a bottom slab and a construction method thereof are provided to prevent damage to a bottom slab by installing shear keys in the whole of a pile body. CONSTITUTION: An underpass using precast concrete piles and a bottom slab comprises wall bodies, a cast-in-place top slab, and a bottom slab. The wall bodies are formed by installing multiple precast concrete piles in a line. The top slab connects the top ends of the wall bodies. The bottom slab is formed by connecting multiple segments(31) to each other along the traveling direction of a vehicle and connects the bottom ends of the wall bodies.

Description

Underpass using precast concrete pile and bottom slab and method for constructing the same}

According to the present invention, a wall slab is made of a ready-made concrete pile and a floor slab is formed in an underground roadway in which a bottom slab connecting the bottom of the wall and the upper slab connecting the top of the wall form a box-shaped cross section formed at a distance from each other. The present invention relates to an underground roadway and a construction method of the concrete slab, which improves the joint connection between the segments forming the floor slab, and prevents the rise of the floor slab in the event of buoyancy caused by the rise of the groundwater level.

An underground roadway is an underground structure that is installed to cross the lower part of a road or railroad so that a person or a vehicle can safely cross the road without interfering with the operation of the road or railroad vehicle. The underground roadway has a configuration in which a box slab is formed between a wall slab on both sides and a bottom slab connecting the bottom of the wall, and an upper slab connecting the top of the wall, which are formed at a distance from each other, and as a lane separator for the safety of a passing vehicle. In order to reinforce the insufficient load capacity of the slab, a central separation wall or a plurality of central separation columns may be installed to connect the upper slab and the bottom slab along the passage direction.

Underground roadways may be post-installed to cross the underside of existing roads or railroads, or the underground roadway may be constructed first and then the roads or railroads may be laid over them. In the former case, suitable temporary facilities or special construction methods are to be installed to prevent settlement of existing roads or railways. In the latter case, the earthquake wall is constructed with H pile, earth plate or sheet pile, and the earthquake wall is supported by the belt and brace to excavate to the required depth, and then the floor slab, the wall and the upper slab are constructed in order by concrete casting. . At this time, the H pile and the earth plate or sheet pile are to be removed after construction of the underground roadway as a temporary facility for excavation. In the case of the underground roadway that is constructed by the site casting method, the cost increase due to the installation and dismantling of the temporary facility, the extension of the construction period, the formwork installation for the construction of the floor slab, the wall and the upper slab by the site casting method, the reinforcing steel assembly, the concrete pouring There is a problem of a lot of field personnel and air delay due to curing.

The present invention is to solve the shortcomings of the conventional underground roadway of the cast-in-place concrete method, to construct a wall slab with a ready-made concrete pile and a bottom slab with a ready-made concrete slab, to improve the joint connection between the segments forming the floor slab and groundwater It is an object of the present invention to provide an underground roadway and a construction method thereof to prevent injuries of the floor slab in the event of buoyancy due to the above rise.

Underground roadway according to a preferred embodiment of the present invention, the pile walls on both sides formed by installing a number of ready-made concrete piles in a line along the vehicle travel direction; Cast-in-place concrete upper slab connecting the upper ends of the pile walls on both sides; and Floor slab formed by connecting a plurality of segments made of ready-made concrete to each other along the traveling direction of the vehicle to connect the lower ends of the pile walls on both sides Characterized in that.

Underground roadway according to another preferred embodiment of the present invention, the upper floor slab of the portion where the floor slab is bonded to the pile wall shears over the entire section of the pile wall to prevent the floating of the floor slab when buoyancy caused by the groundwater level rise The key is installed.

An underground driveway according to another suitable embodiment of the present invention includes a main body in the form of a plate, the segments of which generally have a constant thickness; End haunches integrally formed on the lower surfaces of both ends in the longitudinal direction of the main body; A central portion haunch formed integrally with the lower surface of the central portion in the longitudinal direction of the main body; A plurality of transverse bars embedded in the width direction at intervals from each other along the longitudinal direction of the main body such that both ends are exposed; And a plurality of longitudinal bars embedded in the longitudinal direction at intervals from each other along the width direction of the main body so that both ends are exposed.

Underground roadway according to another suitable embodiment of the present invention, the main body is in the form of a rectangular plate having a long side and a short side, a plurality of reinforcing bar insertion is inserted one end of the transverse reinforcement of the adjacent segment along the edge of one long side The grooves are formed at intervals from each other.

The underground roadway according to another suitable embodiment of the present invention is formed such that the end haunch protrudes further than the short side edge of the main body to form stepped portions at both ends in the longitudinal direction of the segment.

In the underground driveway according to another suitable embodiment of the present invention, a pair of order grouting grooves are formed on the outer circumferential surface of the ready-made concrete pile at a position opposite to the center line passing through the center of the cross section at a rearward position.

According to a preferred embodiment of the present invention, a method for constructing an underground roadway includes constructing a plurality of ready-made concrete piles in a line along a vehicle traveling direction to form pile walls on both sides; Excavating the interior of the pile walls to a design depth while supporting the pile walls; A plate-shaped main body having a constant thickness as a whole, an end haunch integrally formed on the lower surface of both ends in the longitudinal direction of the main body, a central part haunch integrally formed on the lower surface of the central part in the longitudinal direction of the main body, and the main body so that both ends are exposed. It includes a plurality of transverse reinforcement embedded in the width direction at intervals along the longitudinal direction of the plurality of longitudinal reinforcement embedded in the longitudinal direction at intervals from each other along the width direction of the main body so that both ends are exposed, The main body is a rectangular plate shape having a long side and a short side, and a plurality of reinforcing grooves are formed along the edge of one long side at intervals from each other, and the end haunch is adjacent to a segment formed to protrude more than the short side edge of the main body. Transverse of one segment into the reinforcing rod of one segment of the segment Insert the reinforcing bars, connect the transverse bars to each other, and then fill the reinforcing bars into the filler to form floor slabs by continuously constructing them along the traveling direction to connect the lower ends of the pile walls on both sides. Making; And constructing the upper slab to connect the upper ends of the pile walls on both sides.

According to another preferred embodiment of the present invention, a method for constructing an underground roadway includes drilling a hole in a ready-made concrete pile where each segment is in contact with a pile wall, inserting a shear connector, and then filling the hole with non-shrink mortar or resin for shear connector. After fixing the welding and connecting the longitudinal reinforcing bars of the segment to the shear connector and filling the non-shrink mortar on the step formed by the body and the end haunch further comprises forming a shear key over the entire section of the pile wall.

In the underground roadway according to the present invention, since the pile wall functions as a retaining wall, a separate temporary retaining wall is unnecessary for the excavation of the underground road that is constructed as a detachable type, and the floor slab connects a plurality of segments made of ready-made concrete to each other. The construction period can be significantly shortened compared to the existing underground roadway.

In addition, by providing a shear key over the entire section of the pile wall, it is possible to prevent the floor slab from rising without sharing additional load on the pile wall.

The following drawings, which are attached in the present specification, illustrate exemplary embodiments of the present invention, and together with the detailed description of the present invention, serve to further understand the technical spirit of the present invention. It should not be construed as limited.
1 is a cross-sectional view showing an underground roadway according to the present invention.
2 is a cross-sectional view schematically showing a pile wall according to the present invention.
3 is a perspective view showing a segment constituting the floor slab.
4 is a cross-sectional view showing the junction of the pile wall and the bottom slab.
5 is a view showing in sequence the construction method of the underground road according to the present invention.

In the following the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings, but the embodiments presented are exemplary for a clear understanding of the present invention is not limited thereto.

1 is a cross-sectional view showing an underground roadway according to the present invention.

Referring to Figure 1, the underground road according to the present invention, the pile wall (10, 10) on both sides consisting of a number of ready-made concrete piles 11, connecting the upper end of the pile wall (10, 10) on both sides with each other Cast-in-place concrete upper slab 20, the existing concrete floor slab 30 and the bottom slab 30 to connect the lower ends of the pile walls (10, 10) on both sides to the portion to be joined to the pile wall (10, 10) Is installed includes a shear key 40 to prevent the rise of the floor slab 30 when buoyancy caused by the groundwater level rise.

In the present invention, the sidewall of the underground roadway is constructed using the ready-made concrete piles, not the cast-in-place concrete structure, and the ready-made concrete piles have a cylindrical shape having hollows known in the art. In other words, precast prestressed concrete piles and prestressed concrete prestressed by prestressed concrete piles and tensioning materials are pre-introduced by prestressed concrete piles and tensioning materials. It can be divided into PHC pile produced by molding, all of these piles can be applied in the present invention.

The ready-made concrete piles 11 are installed to be in contact with each other in a line along the traveling direction of the vehicle to form a continuous wall of piles. The back surface of the pile wall 10, that is, the surface of the side in contact with the back soil may be grouted for the degree. The method of grouting for the order may be arbitrarily selected from methods known in the art to which this invention belongs. The pile walls 10 and 10 configured as described above function as temporary temporary wall to prevent the collapse of soil on the rear surface for constructing the underground roadway, and form sidewalls of the underground roadway as a permanent structure. Therefore, according to the present invention has the advantage that it is not necessary to construct a temporary temporary wall separately.

On the other hand, in the present invention, as will be described in detail later, it is possible to change the shape of the ready-made concrete pile 11 to minimize the size of the drilling hole for embedding the pile and to order more effectively.

The upper slab 20 may be constructed in a known cast-in-place concrete manner so as to connect the upper ends of the pile walls 10, 10 of both sides composed of a plurality of ready-made concrete piles (11). The ready-made concrete pile 11 constituting the upper slab 20 and the pile wall (10, 10) is a steel joint and the joining method can be applied to a known expansion base and coupling method of PHC pile.

The bottom slabs 30 connect the lower ends of the pile walls 10 and 10 on both sides. In the present invention, the floor slab 30 is configured by connecting a plurality of segments made of ready-made concrete to each other along the traveling direction of the vehicle. Each segment has a length and a constant width corresponding to the distance between the pile walls 10 and 10 on both sides.

A portion of the bottom slab 30 joined to the pile walls 10 and 10 is provided with a shear key 40 to prevent injuries of the bottom slab 30 when buoyancy occurs due to the groundwater level rise. Shear key 40 is installed in the entire section of the wall (10, 10) on the top of the bottom slab (30).

In the underground roadway according to the present invention configured as described above, since the pile wall 10 functions as a retaining wall, a separate temporary temporary wall is not necessary for excavation of the underground roadway that is constructed as a detachable structure, and the floor slab is made of ready-made concrete. Since the construction is performed by connecting a plurality of segments to each other, the construction period can be significantly shortened compared to the existing underground roadway. In addition, by installing the shear key 14 over the entire section of the pile wall 10, it is possible to prevent the floor slab 30 from rising without sharing additional load on the pile wall 10.

2 is a cross-sectional view schematically showing a pile wall according to the present invention.

As described above, the ready-made concrete piles applied to construct the pile wall may have a cylindrical shape having a hollow known in the art, but preferably may have a cross-sectional shape as shown in FIG. 2.

In the case of a column-shaped pile having a known hollow, there is an advantage that it is easy to obtain, but there is a disadvantage that a separate process may be required for the order. Thus, in the present invention, as shown in Figure 2, a pair of order grouting groove 111 at a position opposite to the center line CL passing through the center of the cross section on the outer circumferential surface with a predetermined eccentric distance (e) By applying the ready-made concrete pile (11a) was formed to be able to carry out the order more easily.

Thus, by forming a pair of order grouting groove 111 to have a predetermined eccentric distance (e) to the rear with respect to the center line (CL) passing through the center of the cross section has the advantage that can be constructed as close as possible. If a pair of order grouting grooves 111 are formed on the center line CL passing through the center of the cross section, the grouting agent is spaced apart from each other so that the grouting agent spreads to the rear of the pile, and the grouting agent is not leaked forward. Although it is necessary to take a countermeasure, when the order grouting groove 111 has a predetermined eccentric distance e rearward with respect to the center line CL passing through the center of the cross section as in the present invention, the grouting agent is brought into close contact with the adjacent pile. It can be prevented from leaking.

In addition, in the past, the diameter of the drilling hole needed to be drilled about 10 cm larger than the diameter of the pile. However, when the ready-made concrete pile 11a according to the present invention is applied, the diameter of the drilling hole can be made much smaller, thereby supporting the ready-made concrete pile 11a. Construction is possible as close as possible to the boundary line.

3 is a perspective view showing a segment constituting the floor slab.

Referring to FIG. 3, the segment 31 is a precast precast concrete product, which has a predetermined width and an overall width which is determined in consideration of the length and the transportation and the weight corresponding to the gap between the pile walls 10 and 10. A rectangular plate-shaped main body 311 having a thickness, an end haunch 312 integrally formed on the lower surfaces of both ends in the longitudinal direction of the main body 311, and a lower surface of the central portion in the longitudinal direction of the main body 311. A central portion haunch 313 is formed to reinforce the bending rigidity of the main body 311 and a plurality of transverse reinforcement 314 embedded in the width direction at intervals from each other along the longitudinal direction of the main body 311 so that both ends are exposed. And a plurality of longitudinal rebars 315 embedded in the longitudinal direction at intervals from each other along the width direction of the main body 311 so that both ends are exposed.

The main body 311 is a rectangular plate shape having a long side and a short side, and a plurality of reinforcing bar insertion grooves into which one end of a transverse rebar 314 of a neighboring segment 31 is inserted along both edges of the long side, that is, the width direction ( 311a) are formed at a distance from each other. The number and spacing of the reinforcing bar insertion grooves 311a correspond to the number and spacing of the transverse rebars 314. One end of the transverse rebar 314 embedded in the segment 311 through the rebar insertion groove 311a is exposed and coupled with the transverse rebar 314 of the other segment 31 inserted into the rebar insertion groove 311a. As a result, the segments 31 neighboring each other are integrally connected to each other. Due to the characteristics of the underground roadway, when the curved portion is generated, a gap may be generated in the lower portion of the segment connection portion. By connecting the transverse reinforcing bars 314 and filling the filler into the reinforcing groove 311a, the connection between the segments 31 may be improved. The filler may be non-shrink mortar or resin and the connection of the transverse reinforcing bars 314 may apply any method known in the art, such as welding, the use of couplers, and the like.

The end haunches 312 integrally formed at both lower ends of the main body 311 are formed to protrude more than the short edges of the main body 311 so that stepped ends are formed at both end portions in the longitudinal direction of the segment 31. Using the step formed in this way to form a shear key 40 to prevent the rise of the floor slab as described later.

In order to secure the connection of the segment 31, the sheath tube (not shown) is pre-buried in the width direction of the segment 31, and after the connection of the segment 31 is completed, the tension member is inserted into the sheath tube (not shown) and tension is applied. , Can settle down.

4 is a cross-sectional view showing the junction of the pile wall and the bottom slab.

As shown in FIG. 4, the hole 113 is drilled into the ready-made concrete pile 11 at the position where each segment 31 is in contact with the pile walls 10 and 10, and the shear connector 41 is inserted into the hole 113. The shear connector 41 is fixed by filling with non-shrink mortar or resin. The longitudinal reinforcing bar 315 of the segment 31 is connected to the fixed shear connector 41 fixed in this way, and the non-shrink mortar 42 is filled in the step formed by the main body 311 and the end haunch 312 to shear the key. 40 is formed. The upper surface of the non-shrink mortar 42 may have a shape that is symmetrical with respect to the end haunch 312 and the horizontal line. Shear key 40 is formed over the entire section of the pile wall (10, 10) and thus can prevent the injury of the floor slab 30 in the event of buoyancy caused by the groundwater level rise.

Hereinafter will be described in detail the construction method of the underground driveway according to the present invention configured as described above.

5 is a view showing in sequence the construction method of the underground road according to the present invention.

First, as in (a), the construction of the ready-made concrete pile 11 to form the pile walls (10, 10). The ready-made concrete pile 11 may be constructed by a type pile method or an embedded pile method known as a method of constructing a pile. Preferably it can be constructed by the embedded pile method in order to minimize the construction error, and more preferably can be constructed by the hollow drilling method after drilling in combination with a known embedded pile method. The pile 11 itself is impermeable or the connection between the piles can not be completely in contact with this may cause leakage. Therefore, grouting can be performed for waterproofing the space between piles on the back of the pile.

Next, as shown in (b), the inside of the pile walls 10 and 10 is excavated to the design depth while supporting the inside with the braces 50. The method of excavation while supporting the pile walls 10 and 10 with a brace is widely known in the art, and the detailed description is omitted since it is the same as the method of constructing a retaining wall with the H pile and the earth plate and supporting it with the brace. .

Next, as in (c), after the excavation is completed, the bottom slab 30 is constructed. The floor slab 30 may be made by connecting the precast concrete segments 31 as shown in FIG. 3 to each other along the vehicle traveling direction. The connection of the segment 31 and the segment 31 and the junction between the segment 31 and the pile walls 10, 10 are as described above.

Next, as in (d), the shear key 40 is formed at the position where each segment 31 is in contact with the pile walls 10 and 10. The structure and construction method of the shear key 40 have been described in detail with reference to FIG.

Next, as shown in (e), the upper slab reinforcement (not shown) is placed and the concrete is poured to form the upper slab 20. At this time, the connecting portion of the upper slab 20 and the ready-made concrete pile 11 may apply any coupling method known in the art. 6 shows an example, the upper slab 20 and the ready-made concrete pile 11 by inserting the filling concrete reinforcement 112 into the pile 11 and filling concrete in the pile 11. Can be connected to each other.

Finally, finishing the exposed surface of the pile wall 10, the lower slab 30 and the upper slab 20, paving the upper surface of the lower slab 30, and then cover the construction of the underground driveway is completed.

As described above, in the underground roadway according to the present invention, since the pile walls 10 and 10 function as the wall of the wall, a separate temporary wall wall is not required for the excavation of the underground roadway that is constructed as an open type. In addition, by connecting the precast concrete segment 31, it is possible to quickly construct the floor slab 30 to shorten the air. In addition, it is possible to prevent the floating of the floor slab 30 without applying an additional load to the pile walls 10 and 10 through the shear key 40 installed over the entire sections of the pile walls 10 and 10.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention . The invention is not limited by the invention as such variations and modifications but only by the claims appended hereto.

10: pile wall
20: upper slab
30: floor slab
31: segment
311: main body
312: end haunt
313: Central Haunting
314: transverse rebar
315: longitudinal rebar
40: shear key
41: shear connector
42: non-shrink mortar

Claims (8)

Pile walls on both sides formed by installing a plurality of ready-made concrete piles in a line along a vehicle traveling direction;
Cast-in-place concrete upper slab connecting the upper ends of the pile walls on both sides; And
Underground roadway characterized in that it comprises a floor slab formed by connecting a plurality of segments made of ready-made concrete to each other to connect the lower ends of the pile wall on both sides along the traveling direction of the vehicle. The method according to claim 1,
Underground roadway characterized in that the shear key is installed over the entire section of the pile wall to prevent injuries of the floor slab when buoyancy caused by the rise of the ground water level in the upper portion of the floor slab bonded to the pile wall. The method according to claim 1,
Segment is,
A plate-shaped body having a predetermined thickness as a whole;
End haunches integrally formed on the lower surfaces of both ends in the longitudinal direction of the main body;
A central portion haunch formed integrally with the lower surface of the central portion in the longitudinal direction of the main body;
A plurality of transverse bars embedded in the width direction at intervals from each other along the longitudinal direction of the main body such that both ends are exposed; And
Underground roadway characterized in that it comprises a plurality of longitudinal bars embedded in the longitudinal direction at intervals from each other along the width direction of the body so that both ends are exposed. The method according to claim 3,
The main body is a rectangular plate shape having a long side and a short side, and underground reinforcement diagrams in which a plurality of reinforcing bar insertion grooves into which one end of a transverse rebar of an adjacent segment is inserted along the edge of one long side are spaced from each other. . The method of claim 4,
An end haunch is formed so as to protrude more than the short side edge of the main body, characterized in that to form stepped at both ends of the longitudinal direction of the segment. The method according to claim 1,
An underground driveway, characterized in that a pair of order grouting grooves are formed on the outer circumferential surface of the ready-made concrete pile at a position opposite to the center line passing through the center of the cross section and having a predetermined eccentric distance. Constructing a plurality of ready-made concrete piles in a line along a vehicle traveling direction to form pile walls on both sides;
Excavating the interior of the pile walls to a design depth while supporting the pile walls;
A plate-shaped main body having a constant thickness as a whole, an end haunch integrally formed on the lower surface of both ends in the longitudinal direction of the main body, a central part haunch integrally formed on the lower surface of the central part in the longitudinal direction of the main body, and the main body so that both ends are exposed. It includes a plurality of transverse reinforcement embedded in the width direction at intervals along the longitudinal direction of the plurality of longitudinal reinforcement embedded in the longitudinal direction at intervals from each other along the width direction of the main body so that both ends are exposed, The main body is a rectangular plate shape having a long side and a short side, and a plurality of reinforcing grooves are formed along the edge of one long side at intervals from each other, and the end haunch is adjacent to a segment formed to protrude more than the short side edge of the main body. Transverse of one segment into the reinforcing rod of one segment of the segment Insert the reinforcing bars, connect the transverse bars to each other, and then fill the reinforcing bars into the filler to form floor slabs by continuously constructing them along the traveling direction to connect the lower ends of the pile walls on both sides. Making; And
Construction method of the underground driveway comprising the step of constructing the upper slab to connect the upper ends of the pile walls on both sides. The method according to claim 7,
Punch a hole in the ready-made concrete pile where each segment is in contact with the pile wall, insert the shear connector, fill the hole with non-shrink mortar or resin, fix the shear connector, and weld the longitudinal bars of the segment to the shear connector. And filling a non-shrink mortar in the step formed by the main body and the end haunch to form a shear key over the entire section of the pile wall.

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