KR102719680B1 - Double walled PC Protection Segment for Bridge and Construction Method of Protective Wall Using the same - Google Patents

Abstract

The present invention provides a double-wall protective PC segment, which is capable of being manufactured lightweight with a double PC wall, making it easy to transport and construct, shortening the construction period, and forming at least one protruding rib that induces two double PC walls, which are manufactured separately with precast concrete, to perform a composite behavior with each other, thereby improving structural safety, and wherein the double PC walls are connected in an interlocked manner, and the hollow portion of the double PC wall is filled with a filler to form a composite cross-section with horizontal shear reinforcement, thereby providing excellent resistance to collision load and economic efficiency, and a construction method of a protective wall using the same. According to a preferred embodiment of the present invention, a double-wall protective PC segment comprises: a first PC wall; a second PC wall arranged in a parallel manner with a predetermined distance offset from the first PC wall; a wall connecting rib that connects the first PC wall and the second PC wall and resists vertical and horizontal shear; The invention is characterized in that it includes a front heel for preventing collision of a protective segment protruding from the lower end of the outer surface of the second PC wall and the wall connecting rib; and an opening for slab main reinforcing bar composite that penetrates the lower part of the double wall protective PC segment in the longitudinal direction and is open toward the lower end; wherein the lengths of the first PC wall and the second PC wall are configured to be the same, so that a joint cavity is formed between a pair of double wall protective PC segments that are closely connected adjacently when constructing the double wall protective PC segment.

Description

{Double walled PC Protection Segment for Bridge and Construction Method of Protective Wall Using the same}

The present invention relates to a double-wall protective PC segment used in constructing a bridge protective wall, and a method for constructing a protective wall using the same, and more particularly, to a double-wall protective PC segment capable of being manufactured lightweight as a double PC wall, making transportation and construction easy and shortening the construction period, and having at least one protruding rib formed to induce two double PC walls manufactured separately with precast concrete to perform a composite behavior with each other, thereby improving structural safety, and having double PC walls connected in an interlocked manner to improve durability, and having excellent resistance to collision load and economic efficiency by filling a filler in the hollow portion of the double PC wall to form a composite cross-section with horizontal shear reinforcement.

Generally, a protective wall is installed on both sides of a bridge deck to prevent vehicles from falling in the event of an accident. In the past, the bridge deck was placed on abutments and piers or girders, and when the bridge was almost complete, reinforcement bars were processed and assembled on the edges of the bridge deck, formwork was installed, and concrete was poured and cured to construct the protective wall, or the protective wall machine was used to pour the protective wall without installing formwork.

However, if the protective wall is constructed on site as before, there are disadvantages such as the need for reinforcement of the protective wall, installation of formwork, and curing time until the bridge is completed, which prolongs the construction period and reduces workability, and increases the manpower required, which increases the construction cost. Therefore, to solve this problem, a method using precast protective wall members is presented as follows.

The background technology of the present invention is Korean Patent Registration No. 10-2453839 (Patent Document 1), which proposes a 'bridge barrier wall structure using precast barrier members'. This is a structure that guides and discharges infiltration water to the area where the lower part of the barrier member of the bridge deck is connected, thereby preventing infiltration water that penetrates through the construction joint between the bridge deck and the lower part of the barrier wall from flowing to the outer part of the barrier wall and guiding and discharging it downward from the inner part.

The background technology of the present invention is Korean Utility Model Registration No. 20-0423086 (Patent Document 2), which proposes 'Precast barrier wall member and bridge barrier wall structure using the same'. This is to reduce construction costs by shortening the construction period, improving workability, and reducing the number of workers by prefabricating the barrier wall as a precast barrier member and rigidly assembling and integrating it with the floor slab at the site.

However, the above background technologies have the disadvantage that the weight of the precast barrier members increases, which increases transportation costs, and that lifting and installation are not easy due to safety considerations when handling.

Korean Patent Registration No. 10-2453839 Korean registered utility model registration number 20-0423086

The purpose of the present invention is to provide a double PC segment for protective walls, which is lightweight and easy to transport and construct, shortens the construction period, enables two double PC walls manufactured separately with precast concrete to have a composite behavior with each other, thereby improving structural safety, improves durability by connecting the double PC walls in an interlocked manner, and provides an economical double PC segment and a construction method for a protective wall using the same by filling the hollow portion of the double PC wall with a filler to form a composite cross-section with horizontal shear reinforcement bars, thereby providing excellent earthquake resistance.

According to a preferred embodiment of the present invention, a first PC wall; a second PC wall arranged in parallel and offset from the first PC wall with a predetermined distance therebetween; a wall connecting rib connecting the first PC wall and the second PC wall to resist vertical and horizontal shear; a protective segment collision prevention front hem formed by protruding from the lower end of the outer surface side of the wall connecting rib with the second PC wall; and a slab main reinforcing bar composite opening that penetrates the lower part of the double wall protective PC segment in the longitudinal direction and is open to the lower part; wherein the length of the first PC wall and the length of the second PC wall are configured to be the same, so that a joint cavity is formed between a pair of double wall protective PC segments that are closely connected adjacently when constructing the double wall protective PC segment.

In addition, the wall connecting rib is characterized in that one or more rib hollow portions penetrating in the vertical direction are further formed.

In addition, it is characterized in that a protruding key is formed on each end of one side of the first PC wall and the wall connecting rib, and a key groove is formed on the other end of the second PC wall and the wall connecting rib.

In addition, the front heel of the protective segment for preventing collision is further characterized by having a concrete filling hole formed therein for injecting concrete into the opening for slab main reinforcing bar composite.

In addition, it is characterized in that shear reinforcing bars are additionally embedded in the opening for the slab main reinforcing bar composite to improve the bonding strength with the filling concrete.

In addition, it is characterized in that a plurality of concave pockets are formed in the height direction on the side end portions of the first and second PC walls and on the wall connecting ribs, and a plurality of anchor bolts are installed in each pocket with some of the embedded anchor bolts exposed.

In addition, in order to increase the shear strength of the joint between the adjacent double-wall protective PC segments, it is characterized in that horizontal shear reinforcements are further installed in a grid arrangement in the height direction on the inner surface of the first PC wall and the inner surface of the second PC wall and placed in the joint cavity.

In addition, in order to utilize the double-wall protective PC segment as a central divider constructed in the center of the road, the protective segment's front edge for collision prevention, which is protruded from the lower outer surface of the first PC wall and the wall connecting rib, is characterized in that it additionally protrudes symmetrically in the other direction from the lower outer surface of the first PC wall and the wall connecting rib.

Meanwhile, a method for constructing a protective wall using a double-wall protective PC segment according to the present invention is characterized by including the steps of: providing a plurality of double-wall protective PC segments, sequentially installing them at a construction location of a bridge floor slab while closely contacting each other along the longitudinal direction of the bridge so that a joint cavity is formed between adjacent double-wall protective PC segments; positioning a joint plate in a pocket formed on a joint surface of an adjacent double-wall protective PC segment, inserting an anchor bolt into it, and fastening a nut to the anchor bolt so that the adjacent double-wall protective PC segments are mutually connected via the joint plate; pouring concrete into the joint cavity to fill the slab main reinforcing bar composite opening, and burying an upper protrusion of the slab main reinforcing bar located inside the slab main reinforcing bar composite opening in a concrete layer.

In addition, it is characterized by further including a step of pouring concrete into the rib cavity formed in the wall connecting rib of the double wall protective PC segment.

According to the double-wall protective PC segment of the present invention and the method for constructing a protective wall using the same, the protective segment having a double PC wall structure is manufactured to be lightweight, making it easy to transport and construct, and construction is completed by assembling and installing the protective segments on site and then synthesizing the slab main reinforcing bars, thereby reducing the number of workers and shortening the construction period, resulting in economic efficiency.

In addition, the first PC wall and the second PC wall constituting the double-wall protective PC segment are connected in a staggered structure through wall connecting ribs, so that the horizontal shear stress is structurally enhanced, allowing construction of an excellent protective wall.

In addition, since the joint cavity is formed by a staggered structure at the joint between adjacent double-wall protective PC segments and the filling concrete is poured into it to form a composite structure, an excellent protective wall can be constructed without formwork.

In addition, when horizontal shear reinforcement bars are installed in the first PC wall and the second PC wall of the double wall protective PC segment, the protective wall constructed using the double wall protective PC segment has improved seismic performance because it has a large resistance to horizontal shear.

In addition, since the double-wall protective PC segment can have wide first PC walls and second PC walls, the joints of the double-wall protective PC segment can be reduced, thereby ensuring better durability.

In addition, since the joints of the double-wall protective PC segments are very easy to connect, better workability can be secured.

In addition, since PC segments for double-wall protection can be manufactured in various shapes to meet the design requirements of the protection wall, economical construction is possible.

The following drawings attached to this specification illustrate preferred embodiments of the present invention and, together with the detailed description of the invention, serve to further understand the technical idea of the present invention; therefore, the present invention should not be interpreted as being limited to the matters described in the attached drawings.
FIG. 1 is a perspective view of a double-wall protective PC segment according to an embodiment of the present invention.
Figure 2 is a cross-sectional view of one side of Figure 1.
Figure 3 is a front view of Figure 1.
Figure 4 is a plan view of Figure 3.
Figures 5 (a), (b), and (c) are exemplary views showing various horizontal shear reinforcements installed on the wall of a double-wall protective PC segment according to an embodiment of the present invention.
FIGS. 6A and 6B are perspective and plan views showing the connection state between PC segments for double-wall protection according to an embodiment of the present invention.
Figures 7 and 8 are construction flow charts of a protective wall using a double-wall protective PC segment according to the present invention.
FIG. 9 is a plan view of a modified double-wall protective PC segment according to an embodiment of the present invention.
Figures 10a and 10b are structural conceptual diagrams explaining the synthesis principle of the bridge PC protection segment of the present invention.
Figure 11a is a conceptual diagram of a PC module structure for manufacturing a conventional double-walled body.
Figure 11b is a structural concept diagram of interconnecting manufactured PC modules.
Figure 11c is a cross-sectional view and shear stress diagram for horizontal shear that occurs in the cross-section (a”-“a”) of the connecting section (non-bonded section) that interconnects the PC modules of Figure 2b.

Below, the present invention is described in detail with reference to embodiments presented in the attached drawings, but the presented embodiments are exemplary for a clear understanding of the present invention and the present invention is not limited thereto.

Figures 10a and 10b are structural conceptual diagrams explaining the synthesis principle of the double-wall PC module of the present invention. As shown in Figure 10a, when a load (P) is applied to a girder or slab (10) whose cross section is formed as b (width) × h (height), a shear stress (τ) occurs in the cross section of the member. The maximum shear stress (τ = τ) of the member with a height of h ) occurs at position h/2, causing the entire cross-section to behave as one cross-section.

On the other hand, when a load (P) is applied to a girder or slab (10: 10a, 10b) formed by simply overlapping two members with a cross section of b (width) × h/2 (height), as shown in Fig. 10b, a shear stress (τ) occurs in the cross section of the member. The maximum shear stress (τ = τ) of the cross section formed by two members with a height of h/2 ) occur at locations h/4 and 3h/4, respectively, and since no shear stress (τ=0) occurs at the boundary between the members (10a, 10b), they behave as two cross sections, each with a height of h/2.

In this case, the cross-sectional stiffness of Fig. 10a ( ) is the cross-sectional stiffness of Fig. 10b. ) is four times higher than that of a double wall, so the shape of the cross-section and the method of joining are very important for a double wall that is manufactured by separately manufacturing the walls and then joining them into a single wall.

Figure 11a is a conceptual diagram of a PC module structure for manufacturing a conventional double-walled body, Figure 11b is a conceptual diagram of a structure for interconnecting manufactured PC modules, and Figure 11c is a cross-sectional diagram and shear stress diagram (τ) for horizontal shear that occurs in a cross-section (a”-“a”) of a connecting section (non-joined section) for interconnecting PC modules of Figure 11b. ) is depicted.

As shown in Fig. 11b, a conventional double wall (20) is manufactured by manufacturing PC panels (20a, 20b) with a width (B) of about 1.0 to 3.0 m and a thickness (h) required for an underground structure to form the inner and outer walls, and between them, the inner and outer PC panels (20a, 20b) are mutually connected to each other to induce a unified movement, and the upper and lower panels are connected by a shear connector (21) manufactured in a shape such as a truss structure using steel or steel bars, and on-site concrete is poured into the inner space between them to complete the structure.

That is, one outer PC panel (20a) is first manufactured, and a shear connecting member (21) is fixed and rigidly connected inside the outer PC panel (20a) to be combined with a corresponding lower inner PC panel (20b).

Then, the cured outer PC panel (20a) is turned over, and a shear connecting member (21) of the other end is embedded inside the inner PC panel (20b) where concrete is to be poured at the bottom, and when cured, a single double wall (20) is formed.

In addition, Fig. 11b is a structural concept diagram of interconnecting PC modules manufactured with a conventional double-walled body (20) structure concept, and Fig. 11c illustrates a cross-sectional view and a shear stress diagram for horizontal shear that occurs in a cross-section (“a”-“a”) of a connecting section (non-joined section) that interconnects the double-walled bodies (20) of Fig. 11b.

If there is no shear connector (21) connecting the outer PC panel (20a) and the inner PC panel (20b), an effect similar to Fig. 10b, where the two members do not act synthetically, appears symmetrically above and below the joint.

In addition, since the filling concrete (22) is poured and the inner and outer connecting parts are formed symmetrically at the same location to form a joint surface, in this case, the location at risk of wall defects exists symmetrically at the minimum gap location of the wall, which may cause weakening of watertightness and durability.

Therefore, the present invention provides a double wall protective PC segment (100) in which the walls are manufactured separately and then combined into one wall so that the entire cross-section can operate as one cross-section. The double wall protective PC segment (100) is manufactured in a factory.

As shown in FIGS. 1 to 4, a double-wall protective PC segment (100) includes a first PC wall (101), a second PC wall (102) that is arranged in a parallel manner with a predetermined distance (G) from the first PC wall (101), a wall connecting rib (103) formed in an overlapping section (S) to connect the first PC wall (101) and the second PC wall (102) and resist vertical and horizontal shear, a protective segment collision prevention front hem (104) that is protruded from the lower part of the outer surface of the second PC wall (102) and the wall connecting rib (103), and a slab main reinforcing bar composite opening (105) that penetrates the lower part of the double-wall protective PC segment (100) in the longitudinal direction and is open downward.

Here, the length (L1) of the first PC wall (101) and the length (L2) of the second PC wall (102) are configured to be the same. Therefore, when constructing a double-wall protective PC segment (100) as shown in FIGS. 6a and 6b, a closed cross-section joint cavity (106) is formed between a pair of double-wall protective PC segments (100 and 100) that are closely connected to each other by the first PC wall (101) and the second PC wall (102) and the wall connecting rib (103).

In the case of a double-wall protective PC segment (100), the cross-sectional size of the joint cavity (106) can be adjusted by adjusting the length (L1) of the first PC wall (101) and the length (L2) of the second PC wall (102) during production, and the formation of the cross-sections of the start and end portions of the entire protective wall being constructed can also be achieved.

In this way, the double-wall protective PC segment (100) has a double-wall cross-sectional structure by including a first PC wall (101) and a second PC wall (102), so that it can be manufactured lightweight so that a joint cavity (106) is formed, and transportation and lifting construction are easy.

In addition, the first PC wall (101) and the second PC wall (102) constituting the double-wall protective PC segment (100) are connected in a staggered structure through wall connecting ribs (103), so that an excellent protective wall (1000) with structurally improved horizontal shear stress can be constructed, as shown in Fig. 6a.

In addition, since a joint cavity (106) is formed by a staggered structure at the joint between adjacent double-wall protective PC segments (100 and 100) and filling concrete is poured into the joint cavity (106) to form a composite structure, an excellent protective wall can be constructed without formwork.

Meanwhile, as illustrated in FIG. 9, the double wall protective PC segment (100) may be formed by increasing the width of the wall connecting rib (103) so that one or more rib hollow portions (107) penetrating in the vertical direction are further formed. In the present embodiment, the double wall protective PC segment (100) illustrated in FIG. 9 shows that two rib hollow portions (107) are formed in a single row in the wall connecting rib (103). If the rib hollow portions (107) are further formed in this way, the overall weight of the double wall protective PC segment (100) can be further reduced, and the overall number of joints of the double wall protective PC segment (100) can be reduced when constructing the protective wall.

In addition, in order to increase the assembly efficiency when installing the double-wall protective PC segment (100), as shown in Fig. 1, a protruding key (108a) may be formed on one side end of each of the first PC wall (101) and the wall connecting rib (103), and a key groove (108b) may be formed on the other side end of each of the second PC wall (102) and the wall connecting rib (103). Accordingly, when constructing the protective wall, the joint connection assembly between adjacent double-wall protective PC segments (100 and 100) may be easily performed.

In addition, a concrete filling hole (105a) for pouring concrete into the slab main reinforcing bar composite opening (105) may be further formed in the front heel (104) for preventing collision of the protective segment, and this filling hole (105a) may be used as an air hole when pouring the filling concrete (109).

In addition, shear reinforcing bars (111) that protrude into the slab main reinforcing bar composite opening (105) to improve the bonding strength with the filled concrete can be additionally embedded and manufactured.

Meanwhile, for connection between adjacent double-wall protective PC segments (100 and 100), a plurality of concave pockets (101a, 102a) are formed in the height direction at the end portions of the side surfaces of the first and second PC walls (101, 102) and the wall connecting ribs (103), and a plurality of anchor bolts (110) embedded in the body of the double-wall protective PC segment (100) are installed in a partially exposed manner in each pocket (101a, 102a).

Accordingly, as shown in Fig. 6a, after interfacing the adjacent double-wall protective PC segments (100 and 100), the joint plate (120) is inserted into the anchor bolt (110), and then a nut is fastened to mutually connect the adjacent double-wall protective PC segments (100 and 100).

In addition, in order to increase the shear strength of the joint between the adjacent double-wall protective PC segments (100 and 100), horizontal shear reinforcements (112) may be further installed in a lattice arrangement in the height direction on the inner surface of the first PC wall (101) and the inner surface of the second PC wall (102) and arranged in the joint cavity (106) as shown in FIG. 5. The horizontal shear reinforcements (112) may be installed in various forms such as reinforcing bars and stud bolts as shown in (a), (b), and (c) of FIG. 5.

In addition, a front heel (104) for collision prevention of a protective segment protruding from the outer lower portion of the first PC wall (102) and the wall connecting rib (103) is additionally protruded symmetrically in the other direction from the outer lower portion of the first PC wall (101) and the wall connecting rib (103), so that it can be installed as an excellent central divider installed in the center of a roadway.

The unexplained symbol '131' is 'wall reinforcement' and is placed inside the wall to resist impact loads.

The method for constructing a protective wall using a double-wall protective PC segment (100) configured in this manner is sequentially explained.

First, as shown in Fig. 1, a number of double-wall protective PC segments (100) are prepared on site, and sequentially installed at the construction location of the bridge floor slab (200) as shown in Fig. 7, but are placed in close contact with each other along the longitudinal direction of the bridge as shown in Figs. 6a and 6b so that a joint cavity (106) is formed between adjacent double-wall protective PC segments (100 and 100).

Next, as shown in Fig. 6a, a joint plate (120) is positioned in a pocket (102a) formed at the joint surface of adjacent double-wall protective PC segments (100 and 100), inserted into an anchor bolt (110), and a nut (122) is fastened to the anchor bolt (110) to interconnect adjacent double-wall protective PC segments (100 and 100) via the joint plate (120).

Next, as shown in Fig. 6a, filling concrete (109) is poured into the joint cavity (106) to fill the slab main reinforcing bar composite opening (105), and the slab main reinforcing bar (210) located inside the slab main reinforcing bar composite opening (105) is embedded in the concrete layer to be composited.

Here, if a rib cavity (107) is further formed in the double wall protection PC segment (100) as shown in Fig. 9, concrete can be filled through this rib cavity (107).

In this way, when the double wall protective PC segment (100) is applied, the construction of the protective wall (1000) is simply completed by lifting and arranging the double wall protective PC segment (100), connecting the joints of the double wall protective PC segment (100), and pouring concrete in the joint cavity (106). In this case, since the joints between the double wall protective PC segments (100 and 100) are very easy to connect, better workability can be secured.

In addition, since the double-wall protective PC segment (100) can be manufactured in a factory in various shapes to suit design requirements, economical construction of the protective wall is possible.

In addition, the double wall protection PC segment (100) can be applied to various fields such as double walls of underground structures and architectural walls where structural performance, watertightness, and constructability are required.

Although the present invention has been described in detail with reference to the presented embodiments, those skilled in the art will be able to make various modifications and variations without departing from the technical spirit of the present invention by referring to the presented embodiments. The present invention is not limited by such modifications and variations, but is only limited by the claims attached below.

100: PC segment for double wall protection
101: 1st PC wall
102: 2nd PC wall
103: Wall connecting rib
104: Front heel for collision prevention of protective segment
105: Opening for composite slab cast iron
105a: Concrete fill hole
106: Joint cavity
107: Rib hollow section
108a: protruding key
108b: Key home
111: Shear reinforcement
110: Anchor bolt
112: Horizontal shear reinforcement
120: Joint Plate
1000: Firewall

Claims (10)

In the double wall protective PC segment (100),
1st PC wall (101) and;
A second PC wall (102) arranged in a parallel manner with a predetermined distance (G) from the first PC wall (101);
A wall connecting rib (103) that connects the first PC wall (101) and the second PC wall (102) and resists vertical and horizontal shear;
A front heel (104) for preventing collision of a protective segment protrudingly formed on the lower part of the outer surface of the second PC wall (102) and the wall connecting rib (103);
A slab main reinforcing bar composite opening (105) is included that penetrates longitudinally and is open to the bottom of a double wall protective PC segment (100).
A double wall protective PC segment characterized in that the length (L1) of the first PC wall (101) and the length (L2) of the second PC wall (102) are configured to be the same so that a joint cavity (106) is formed between a pair of double wall protective PC segments (100 and 100) that are closely connected adjacently when constructing the double wall protective PC segment (100). In paragraph 1,
A double wall protective PC segment characterized in that the wall connecting rib (103) is further formed with one or more rib hollow portions (107) penetrating in a vertical direction. In paragraph 1,
A double-wall protective PC segment characterized in that a protruding key (108a) is formed on each of the end portions of one side of the first PC wall (101) and the wall connecting rib (103), and a key groove (108b) is formed on each of the end portions of the other side of the second PC wall (102) and the wall connecting rib (103). In paragraph 1,
A double-wall protective PC segment characterized in that a concrete filling hole (105a) for injecting concrete into a slab main reinforcing bar composite opening (105) is further formed in the front heel (104) of the protective segment for preventing collision. In paragraph 1,
A double wall protective PC segment characterized in that a shear reinforcing bar (111) is additionally embedded in the above slab main reinforcing bar composite opening (105) to improve bonding strength with the filled concrete. In paragraph 1,
A double wall protective PC segment characterized in that a plurality of concave pockets (102a) are formed in the height direction on the side ends of the first and second PC walls (101, 102) and the wall connecting ribs (103), and a plurality of anchor bolts (110) embedded in each pocket (102a) are installed with a portion exposed. In paragraph 1,
A double-wall protective PC segment characterized in that, in order to increase the shear strength of the joint between adjacent double-wall protective PC segments (100 and 100), horizontal shear reinforcement members (112) are further installed in a lattice arrangement in the height direction on the inner surface of the first PC wall (101) and the inner surface of the second PC wall (102) and are arranged in the joint cavity (106). In paragraph 1,
A double-wall protective PC segment (100) characterized in that a protective segment collision prevention front heel (104) protrudes from the lower outer surface of the first PC wall (101) and the wall connecting rib (103) to further symmetrically protrude in the other direction from the lower outer surface of the first PC wall (101) and the wall connecting rib (103) in order to utilize the double-wall protective PC segment (100) as a central divider constructed in the center of a roadway. A step of sequentially installing a plurality of double-wall protective PC segments (100) described in claim 1 at a construction location of a bridge floor slab (200), but in close contact with each other along the longitudinal direction of the bridge, so that a joint cavity (106) is formed between adjacent double-wall protective PC segments (100 and 100);
A step of positioning a joint plate (120) in a pocket (102a) formed at the joint surface of adjacent double-wall protective PC segments (100 and 100), inserting an anchor bolt (110) through it, and fastening a nut (122) to the anchor bolt (110) to mutually connect adjacent double-wall protective PC segments (100 and 100) via the joint plate (120);
A method for constructing a protective wall using a double wall protective PC segment, characterized in that the construction includes the step of pouring concrete into a joint cavity (106) to fill the opening (105) for slab main reinforcing bar composite, and burying the upper protrusion of the slab main reinforcing bar (210) located inside the opening (105) for slab main reinforcing bar composite in a concrete layer. In Article 9,
A method for constructing a protective wall using a double-wall protective PC segment, characterized in that it further includes a step of pouring concrete into a rib cavity (107) formed in a wall connecting rib (103) of a double-wall protective PC segment (100).

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