Guardrail, method for installing guardrail, and method for replacing floor slab

Abstract

To shorten a traffic regulation period required for fixing a guard fence.SOLUTION: A guard fence 1A partitioning a road 50 formed by floor slabs 21, 22, 23, 24 includes: the floor slabs 22, 23; a guard fence part 10A partitioning the road 50; a floor slab through-hole part 20h vertically penetrating the floor slabs 22, 23; and a fixing member 30 inserted into the floor slab through-hole part 20h and fixing the guard fence part 10A to the floor slabs 22, 23. Since the guard fence part 10A is fixed to the floor slabs 22, 23 by the fixing member 30 which is inserted into the floor slab through-hole part 20h vertically penetrating the floor slabs 22, 23 and fixes the guard fence part 10A to the floor slabs 22, 23, more works required for fixing the guard fence part to the floor slab can be performed from a lower surface of the floor slab compared with a conventional technique in which a temporary guard fence is fixed to the floor slab by an anchor driven into an upper surface of the floor slab.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a protective fence, a method for installing a protective fence, and a method for replacing a floor slab.

Background Art

[0002] A technique for replacing an existing floor slab forming a road of a bridge with a new floor slab has been proposed. During the period of work for replacing the floor slab in a part of the lanes of the road, it is desirable that the other lanes of the road continue to be used for vehicle passage. Therefore, for example, Patent Document 1 discloses a technique in which a temporary protective fence is installed on the road in order to partition a lane where work for replacing an existing floor slab is being carried out and a lane that is being used for vehicle passage.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in the above-described technique, in order to safely perform the floor slab replacement work in another lane (Lane A) while using a part of the lanes (Lane B), it is disclosed that a temporary protective fence for preventing vehicles from deviating from the lane is provided. In order to install a temporary protective fence having a strength to withstand the impact of vehicle lane deviation, it is necessary to regulate the lane and stop vehicle passage in the lane. Therefore, the traffic regulation period required for installing the protective fence is long.

[0005] Therefore, an object of the present invention is to provide a protective fence, a method for installing a protective fence, and a method for replacing a floor slab that can shorten the traffic regulation period required for installing the protective fence.

Means for Solving the Problems

[0006] The present invention relates to a protective fence that divides a road formed by a floor slab, and includes a floor slab, a protective fence portion that divides the road, a floor slab through-hole portion that penetrates the floor slab vertically, and a fixing member that is inserted into the floor slab through-hole portion and fixes the protective fence portion to the floor slab.

[0007] According to this configuration, in a protective fence that divides a road formed by a floor slab, there are provided a floor slab, a protective fence portion that divides the road, a floor slab through-hole portion that penetrates the floor slab vertically, and a fixing member that is inserted into the floor slab through-hole portion and fixes the protective fence portion to the floor slab. Since the protective fence portion is fixed to the floor slab by the fixing member that is inserted into the floor slab through-hole portion that penetrates the floor slab vertically, compared with the conventional technique in which a temporary protective fence is fixed to the floor slab by an anchor driven into the upper surface of the floor slab, more of the work required to fix the protective fence portion to the floor slab can be done from the lower surface of the floor slab. Therefore, the traffic control period required for installing the protective fence can be shortened.

[0008] In this case, the floor slab has a plurality of precast floor slabs arranged at intervals in the traveling direction of the road, and infill concrete cast in place between the plurality of precast floor slabs, and the floor slab through-hole portion may be formed in the infill concrete.

[0009] According to this configuration, in a floor slab having a plurality of precast floor slabs arranged at intervals in the traveling direction of the road and infill concrete cast in place between the plurality of precast floor slabs, the floor slab through-hole portion is formed in the infill concrete, and since no holes are provided in the precast floor slabs that mainly constitute the floor slab, the durability of the floor slab is improved.

[0010] Further, the present invention relates to a method for installing a protective fence that divides a road formed by a floor slab, and includes a floor slab through-hole portion forming step of forming a floor slab through-hole portion that penetrates the floor slab vertically, and a protective fence portion fixing step of arranging a protective fence portion that divides the road on the floor slab and fixing the protective fence portion to the floor slab by a fixing member inserted into the floor slab through-hole portion formed in the floor slab through-hole portion forming step.

[0011] In this case, the floor slab is a newly installed one replacing the existing one, and has a plurality of precast floor slabs arranged at intervals in the advancing direction of the road, and the infill concrete cast in place between the plurality of precast floor slabs. After arranging the plurality of precast floor slabs at intervals in the advancing direction of the road by replacing the existing one, it further includes a floor slab new installation step of casting the infill concrete in place between the plurality of precast floor slabs. In the floor slab through-hole part forming step, when casting the infill concrete in place in the floor slab new installation step, the floor slab through-hole part may be formed in the infill concrete.

[0012] According to this configuration, in the floor slab new installation step, after a plurality of precast floor slabs are arranged at intervals in the advancing direction of the road by replacing the existing one, the infill concrete is cast in place between the plurality of precast floor slabs. In the floor slab through-hole part forming step, when casting the infill concrete in place in the floor slab new installation step, the floor slab through-hole part is formed in the infill concrete. Therefore, the on-site casting of the infill concrete and the formation of the floor slab through-hole part can be carried out together, and the formation of the floor slab through-hole part becomes easy.

[0013] Also, the fixing member is composed of a bar protruding below the guardrail part and a fastening member fitted to the bar. In the guardrail part fixing step, while inserting the bar into the floor slab through-hole part formed by the floor slab through-hole part forming step, the guardrail part is arranged on the floor slab, and the guardrail part may be fixed to the floor slab by fitting the fastening member to the bar inserted into the floor slab through-hole part.

[0014] According to this configuration, the fixing member is composed of a bar protruding below the protective fence portion and a fastening member fitted to the bar. In the protective fence portion fixing step, the bar is inserted into the floor slab through-hole portion formed in the floor slab through-hole portion forming step, and the protective fence portion is disposed on the floor slab. Therefore, immediately after the protective fence portion is disposed on the floor slab, the protective fence portion is disposed on the floor slab so as not to shift laterally. Further, in the protective fence portion fixing step, the protective fence portion is fixed to the floor slab by fitting the fastening member to the bar inserted into the floor slab through-hole portion. Therefore, in the protective fence portion fixing step, more of the work required to fix the protective fence portion to the floor slab can be performed from the lower surface of the floor slab. Accordingly, the traffic control period required to install the protective fence can be shortened.

[0015] Further, the present invention is a floor slab replacement method for replacing the floor slab of a road having a plurality of lanes, including an existing floor slab through-hole portion forming step of forming an existing floor slab through-hole portion that vertically penetrates the existing floor slab in a part of the plurality of lanes, and arranging a protective fence portion that divides a part of the lanes on the existing floor slab in which the existing floor slab through-hole portion has been formed in the existing floor slab through-hole portion forming step, and fixing the protective fence portion to the existing floor slab by a fixing member inserted into the existing floor slab through-hole portion. An existing floor slab protective fence portion fixing step, a first existing floor slab removing step of removing the existing floor slab in other lanes except for a part of the lanes in which the protective fence portion has been fixed in the existing floor slab protective fence portion fixing step, and a first floor slab new installation step of arranging a plurality of precast floor slabs in other lanes where the existing floor slab has been removed in the first existing floor slab removing step.

[0016] According to this configuration, after the existing floor slab through-hole portion forming step and the existing floor slab protective fence portion fixing step in which the traffic control period is shortened, while using a part of the lanes partitioned by the protective fence portion for vehicle passage, a first existing floor slab removing step of removing the existing floor slab in other lanes and a first floor slab new installation step of arranging precast floor slabs in other lanes are performed. Therefore, the period during which the road can be used for vehicle passage can be made longer.

[0017] In this case, in the first-stage floor slab new construction process, after arranging a plurality of precast floor slabs side by side with a space in the traveling direction of the other lane, in-situ concrete is placed in the space between the plurality of precast floor slabs. When placing the in-situ concrete, an in-situ concrete through-hole part that penetrates the in-situ concrete vertically is formed. In the existing floor slab protection fence part fixing process, the fixing by the fixing member between the protection fence part fixed to the existing floor slab and the existing floor slab is released. In the floor slab new construction process, while moving the protection fence part to the in-situ concrete and the plurality of precast floor slabs in which the in-situ concrete through-hole part is formed, the protection fence part is fixed to the in-situ concrete and the plurality of precast floor slabs by the fixing member inserted into the in-situ concrete through-hole part formed in the floor slab new construction process, which is the new floor slab protection fence part fixing process. After the new floor slab protection fence part fixing process, a second-stage existing floor slab removal process of removing the existing floor slab in some lanes may be further provided, and a second-stage floor slab new construction process of arranging a plurality of precast floor slabs in some lanes where the existing floor slab has been removed in the second-stage existing floor slab removal process.

[0018] According to this configuration, in the new floor slab protection fence part fixing process, the fixing by the fixing member between the protection fence part fixed to the existing floor slab and the existing floor slab in the existing floor slab protection fence part fixing process is released. In the floor slab new construction process, the protection fence part is moved to the in-situ concrete and the plurality of precast floor slabs in which the in-situ concrete through-hole part is formed, and is arranged. The protection fence part is fixed to the in-situ concrete and the plurality of precast floor slabs by the fixing member inserted into the in-situ concrete through-hole part formed in the floor slab new construction process. Therefore, the traffic control period required to move the protection fence part from the existing floor slab and then install it on the precast floor slab can be shortened.

[0019] Furthermore, after the new floor slab protection fence part fixing process with a shortened traffic control period, while making the other lanes partitioned by the protection fence part available for vehicle passage, a second-stage existing floor slab removal process of removing the existing floor slab in some lanes and a second-stage floor slab new construction process of arranging precast floor slabs in some lanes are carried out. Therefore, the period during which the road can be made available for vehicle passage can be extended.

[0020] In addition, the present invention relates to a protective fence that demarcates a road formed by a floor slab. The protective fence includes a first protective fence portion that extends along a lane of the road demarcated by the protective fence, and a second protective fence portion that extends continuously along the lane and is continuous with the first protective fence portion. A connecting portion that connects the first protective fence portion and the second protective fence portion has a convex portion on one side and a concave portion on the other side when viewed vertically, and the convex portion and the concave portion are capable of fitting together.

[0021] According to this configuration, in the protective fence that demarcates a road formed by a floor slab, the protective fence includes a first protective fence portion that extends along a lane of the road demarcated by the protective fence, and a second protective fence portion that extends continuously along the lane and is continuous with the first protective fence portion. However, the connecting portion that connects the first protective fence portion and the second protective fence portion has a convex portion on one side and a concave portion on the other side when viewed vertically, and the convex portion and the concave portion are capable of fitting together. Therefore, it is easy to connect the first protective fence portion and the second protective fence portion, and the traffic control period required for installing the protective fence can be shortened.

[0022] In this case, it is preferable that the convex portion and the concave portion have locking portions that restrict movement in the direction along the lane.

[0023] According to this configuration, since the convex portion and the concave portion have locking portions that restrict movement in the direction along the lane, it is easy to connect the first protective fence portion and the second protective fence portion, and the traffic control period required for installing the protective fence can be shortened.

[0024] Furthermore, it is preferable to further include a floor slab through-hole portion that penetrates the floor slab vertically, and a fixing member that is composed of a bar protruding downward from the first protective fence portion and the second protective fence portion, is inserted into the floor slab through-hole portion, and fixes the first protective fence portion and the second protective fence portion to the floor slab.

[0025] According to this configuration, the first and second protective fence portions are fixed to the floor slab by a fixing member that is inserted into a floor slab through-hole portion penetrating the floor slab vertically and fixes the first and second protective fence portions to the floor slab. Therefore, compared with the technique in which a temporary protective fence is fixed to the floor slab by an anchor driven into the upper surface of the conventional floor slab, more of the work required to fix the protective fence portion to the floor slab can be done from the lower surface of the floor slab. Therefore, the traffic control period required for installing the protective fence can be shortened.

[0026] Further, the present invention is a method for installing a protective fence that divides a road formed by a floor slab, the method including a first protective fence portion installation step of installing a first protective fence portion so as to extend along a lane of the road partitioned by the protective fence, and a second protective fence portion installation step of installing a second protective fence portion so as to extend continuously along the lane following the first protective fence portion. In the first protective fence portion installation step and the second protective fence portion installation step, the connecting portion connecting the first protective fence portion and the second protective fence portion has a convex portion on one side and a concave portion on the other side when viewed vertically, and the convex portion and the concave portion are engageable, and it is a method for installing a protective fence for installing the first and second protective fence portions.

[0027] In this case, in the first protective fence portion installation step and the second protective fence portion installation step, it is preferable to install the first and second protective fence portions having a locking portion that restricts movement in the direction along the lane on the convex portion and the concave portion.

[0028] Further, in the first protective fence portion installation step, on a floor slab having a floor slab through-hole portion penetrating the floor slab vertically, a first protective fence portion including a bar protruding downward from the first protective fence portion and having a fixing member for fixing the first protective fence portion to the floor slab is installed while inserting the bar through the floor slab through-hole portion. In the second protective fence portion installation step, on a floor slab having a floor slab through-hole portion, a second protective fence portion including a bar protruding downward from the second protective fence portion and having a fixing member for fixing the second protective fence portion to the floor slab is installed while inserting the bar through the floor slab through-hole portion, which is preferable.

Effects of the Invention

[0029] According to the protective fence of the present invention, the method for installing the protective fence, and the method for replacing the floor slab, the traffic control period required for fixing the protective fence can be shortened.

Brief Description of the Drawings

[0030]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Embodiments for Carrying Out the Invention

[0031] Hereinafter, a protective fence, a method for installing the protective fence, and a method for replacing a floor slab according to an embodiment of the present invention will be described in detail with reference to the drawings. The method for replacing a floor slab according to the first embodiment of the present invention is applied to replace the floor slab 20 of a road 50 having a plurality of lanes 51 and 52 as shown in FIG. 1(A). The protective fence and the method for installing the protective fence according to the present embodiment are applied, for example, in the method for replacing a floor slab according to the present embodiment.

[0032] As shown in FIG. 1(A), the existing floor slab 20 forming the road 50 is installed on the bridge girder 41. Paving 28 is formed on most of the upper surface of the floor slab 20 corresponding to the road surface of the road 50 except for both end portions in the width direction of the road 50. Wall parapets 42 are installed on both end portions of the floor slab 20 corresponding to both end portions in the width direction of the road 50. In the example of FIG. 1(A), the upper part of the existing floor slab 20 is used for the passage of vehicles V as a road 50 having two one-way lanes 51 and 52 on one side.

[0033] In the method for replacing a floor slab of the present embodiment, during the work of replacing the floor slab 20 in either one of the two lanes 51 and 52 of the road 50, the other of the lanes 51 and 52 continues to be used for the passage of vehicles V. Therefore, in order to partition either one of the lanes 51 and 52 in which the work of replacing the floor slab 20 is being performed and the other of the lanes 51 and 52 that is used for the passage of vehicles V, as shown in FIGS. 2(A), 2(B), 2(C), 4(A), 4(B), and 4(C), a protective fence 1A that partitions the road formed by the floor slab 20 is installed on the road 50.

[0034] As shown in FIG. 1(B), the existing floor slab 20 is divided into two parts, the existing floor slabs 21 and 22, along the traveling directions of the road 50 and the lanes 51 and 52. The floor slab 21 is first replaced, and the floor slab 22 is provided for the passage of the vehicle V during the replacement operation of the floor slab 21. As shown in FIG. 1(B), in the floor slab replacement method of the present embodiment, an existing floor slab through-hole forming step of forming an existing floor slab through-hole portion 22h (floor slab through-hole portion 20h) that vertically penetrates the existing floor slab 22 in a part of the lanes 52 among the plurality of lanes 51 and 52 is performed. The existing floor slab through-hole forming step corresponds to the floor slab through-hole forming step in the method for installing the guardrail of the present embodiment. The existing floor slab through-hole portion 22h also vertically penetrates the paving 28 on the upper surface of the existing floor slab 22.

[0035] In the existing floor slab through-hole forming step, the existing floor slab through-hole portion 22h is formed by drilling from the upper surface of the existing floor slab 22. However, for example, it can also be formed by drilling with a drill bit or the like from the lower surface of the existing floor slab 22. In this case, in the existing floor slab through-hole forming step, work on the road surface of the road 50 is not required. Therefore, during the existing floor slab through-hole forming step and the work of the floor slab through-hole forming step for the existing floor slab 22, the lanes 51 and 52 can be provided for the passage of the vehicle V.

[0036] When the existing floor slab through-hole portion 22h is formed by drilling from the lower surface of the existing floor slab 22, for example, the passage of the vehicle V may be restricted by installing a load cone or the like on the upper surface of the paving 28 at the position where the existing floor slab through-hole portion 22h is formed. Further, when the existing floor slab through-hole portion 22h is formed by drilling with a drill bit from the lower surface of the existing floor slab 22, an iron plate or the like may be laid on the upper surface of the paving 28 at the position where the existing floor slab through-hole portion 22h is formed as necessary so that the tip of the drill bit does not protrude above the upper surface of the paving 28.

[0037] As shown in FIG. 1(C), the wall railing 42 is removed from the existing floor slab 21 to be replaced first. As shown in FIGS. 1(C), 1(D), 2(A), 2(B) and 2(C), in the method for replacing the floor slab of the present embodiment, on the paving 28 of the existing floor slab 22 in which the existing floor slab through-hole portion 22h is formed in the existing floor slab through-hole portion forming step, a guardrail portion 10A that partitions a part of the lane 52 is arranged, and the guardrail portion 10A is fixed on the paving 28 of the existing floor slab 22 by a fixing member 30 inserted through the existing floor slab through-hole portion 22h, and an existing floor slab guardrail portion fixing step is performed. The existing floor slab guardrail portion fixing step corresponds to the guardrail portion fixing step in the method for installing the guardrail of the present embodiment.

[0038] More specifically, as shown in FIGS. 2(B) and 2(C), the fixing member 30 includes a rod 31 protruding downward from the guardrail portion 10A and a fastening member 32 fitted to the rod 31. For example, the rod 31 is a bolt, that is, a rod formed with a male screw, and a member composed of a rod formed with a male screw and a head, and the fastening member 32 is, for example, a nut. As shown in FIG. 1(C), in the existing floor slab guardrail portion fixing step, the guardrail portion 10A is lowered vertically by using a hoist such as an erection machine, the rod 31 is inserted into the existing floor slab through-hole portion 22h formed by the floor slab through-hole portion forming step, and the guardrail portion 10A is arranged on the paving 28 of the floor slab 22. Further, as shown in FIGS. 1(D), 2(A), 2(B) and 2(C), in the existing floor slab guardrail portion fixing step, after the guardrail portion 10A is arranged on the floor slab 22, by working from the lower surface of the floor slab 22, the fastening member 32 is fitted to the rod 31 inserted through the existing floor slab through-hole portion 22h, so that the guardrail portion 10A is fixed on the paving 28 of the floor slab 22.

[0039] In the existing floor slab protection fence fixing process, in order to ensure the bearing area, a lower plate having a contact surface that contacts the lower surface of the floor slab 22 and an insertion hole through which the bar 31 is inserted may be applied. In the existing floor slab protection fence fixing process, after attaching the lower plate to the bar 31 so that the bar 31 inserted through the existing floor slab through hole 22h is further inserted into the insertion hole of the lower plate, the fastening member 32 is fitted to the bar 31, and the protection fence 10A may be fixed by the fastening member 32 via the lower plate. Thereby, the bearing area can be increased.

[0040] Hereinafter, the protection fence 1A with the protection fence 10A fixed to the existing floor slab 22 of the present embodiment will be described. As shown in FIGS. 2(A), 2(B), and 2(C), the protection fence 1A of the present embodiment divides the road 50 formed by the floor slabs 21 and 22. The protection fence 1A includes an existing floor slab 22, a protection fence portion 10A that divides the road 50, an existing floor slab through hole 22h (floor slab through hole 20h) that vertically penetrates the floor slab 22, and a fixing member 30 (bar 31 and fastening member 32) that is inserted through the existing floor slab through hole 22h and fixes the protection fence portion 10A to the floor slab 22.

[0041] The protection fence portion 10A is made of steel. The protection fence portion 10A has a support column 11A, a beam 12A, a support column base plate 13A, a reinforcing rib 14A, and a protection plate 15. The support column 11A extends in a direction perpendicular to the upper surface of the floor slab 22 from the paving 28 on the upper surface of the floor slab 22. The support column 11A supports the beam 12A extending along the traveling direction of the road 50 from below the beam 12A. The support column base plate 13A is a steel plate extending in a direction parallel to the upper surface of the floor slab 22. The support column base plate 13A is integrated with the support column 11A at the lower end of the support column 11A and fixes the support column 11A to the floor slab 22.

[0042] The support base plate 13A includes a plate hole portion 13h that penetrates the support base plate 13A vertically. The plate hole portion 13h includes a thread groove corresponding to the thread groove of the bolt which is the bar 31 of the fixing member 30 on its inner peripheral surface. In the existing floor slab protection fence portion fixing process described above, the bolt which is the bar 31 is screwed into the plate hole portion 13h in advance to be integrated with the protection fence portion 10A, and is transported and arranged by an erection machine or the like in a state of protruding downward from the support base plate 13A of the protection fence portion 10A.

[0043] Therefore, even immediately after the bar 31 is inserted into the existing floor slab through hole portion 22h and the protection fence portion 10A is arranged on the floor slab 22, and before the fastening member 32 is fitted to the bar 31, the protection fence portion 10A is arranged on the floor slab 22 so as not to shift laterally. In this state, the protection fence portion 10A functions as, for example, a type-A protection fence in the installation standard of the protection fence by the Ministry of Land, Infrastructure, Transport and Tourism. Therefore, even immediately after the protection fence portion 10A is arranged on the floor slab 22 and before the fastening member 32 is fitted to the bar 31, the lane 52 formed by the floor slab 22 can be provided for the passage of the vehicle V.

[0044] Also, the inner diameter of the existing floor slab through hole portion 22h is sufficiently larger than the diameter of the bar 31. In a state where the fastening member 32 is fitted to the bar 31, it is preferable that the outer peripheral surface of the bar 31 inserted into the existing floor slab through hole portion 22h and the inner peripheral surface of the existing floor slab through hole portion 22h are not in contact. By not being in contact, in a state where the fastening member 32 is fitted to the bar 31, the protection fence portion 10A is fixed and secured to the floor slab 22 by the frictional force between the support base plate 13A and the floor slab 22. In a state where the fastening member 32 is fitted to the bar 31, the protection fence portion 10A functions as, for example, a type-SB protection fence in the installation standard of the protection fence by the Ministry of Land, Infrastructure, Transport and Tourism.

[0045] Between the lower portions of the side surfaces of the support column 11A on the lane 51 side and the side surfaces on the lane 52 side, and the support column base plate 13A, a pair of reinforcing ribs 14A are provided. Below the beam 12A, on the side surfaces of the support column 11A on the lane 51 side and the lane 52 side, a pair of protective plates 15 extending along the direction orthogonal to the upper surface of the floor slab 22 and the traveling direction of the road 50 are attached.

[0046] The lane 52 partitioned by the above guardrail 1A is provided for the passage of the vehicle V. As shown in FIG. 1(E), in the floor slab replacement method of the present embodiment, in the other lanes 51 except for the lane 52 of the existing floor slab 22 where the guardrail portion 10A was fixed in the existing floor slab guardrail portion fixing step, a first existing floor slab removal step of removing the existing floor slab 21 is performed and completed.

[0047] Next, as shown in FIGS. 1(F), 3(A), 4(A), 4(B), and 4(C), in the floor slab replacement method of the present embodiment, a first floor slab new construction step of arranging a plurality of precast floor slabs 25 is performed on the lane 51 where the existing floor slab 21 was removed in the first existing floor slab removal step. The first floor slab new construction step corresponds to the floor slab new construction step in the guardrail installation method of the present embodiment.

[0048] As shown in FIGS. 1(F), 4(A), 4(B), and 4(C), in the first floor slab new construction step of the floor slab replacement method of the present embodiment, a plurality of precast floor slabs 25 are arranged side by side with spaces in the traveling direction of the lane 51. As shown in FIGS. 3(A), 4(A), 4(B), and 4(C), in the first floor slab new construction step, after a plurality of precast floor slabs 25 are arranged side by side with spaces in the traveling direction of the other lane 51, the gap-filling concrete 27 is cast in place between the plurality of precast floor slabs 25.

[0049] In the first floor slab new construction process, when the infill concrete 27 is placed on-site, an infill concrete through-hole portion 27h (floor slab through-hole portion 20h) that penetrates the infill concrete 27 vertically is formed. Therefore, similar to the existing floor slab through-hole portion forming process described above, the first floor slab new construction process corresponds to the floor slab through-hole portion forming process in the method for installing the protective fence of the present embodiment. The formation of the infill concrete through-hole portion 27h is performed, for example, by arranging void tubes corresponding to the shape of the infill concrete through-hole portion 27h as formwork when the infill concrete 27 is placed on-site. On the precast floor slab 25 and the infill concrete 27, a wall railing 43 is installed, a pavement 28 is formed, and the first floor slab new construction process is completed.

[0050] Through the above first floor slab new construction process, a floor slab 23 having a plurality of precast floor slabs 25 arranged with spaces in the advancing direction of the road 50 and infill concrete 27 placed on-site between the plurality of precast floor slabs 25 is newly installed in the lane 51. Even during the operation of the first existing floor slab removal process, the lane 52 is provided for the passage of the vehicle V.

[0051] As shown in FIGS. 3(B), 3(C), 4(A), 4(B), and 4(C), in the floor slab replacement method of the present embodiment, a new floor slab protective fence portion fixing process for fixing the protective fence portion 10A to the floor slab 23 newly constructed in the first floor slab new construction process is performed. Similar to the existing floor slab protective fence portion fixing process described above, the new floor slab protective fence portion fixing process corresponds to the protective fence portion fixing process in the method for installing the protective fence of the present embodiment.

[0052] In the new floor slab protective fence portion fixing process, the fixing by the fixing members 30 (bar 31 and fastening member 32) between the protective fence portion 10A fixed to the existing floor slab 22 and the existing floor slab 22 in the existing floor slab protective fence portion fixing process is released. Specifically, the nut, which is the fastening member 32, is removed from the bolt, which is the bar 31.

[0053] In the new floor slab protective fence part fixing process, the protective fence part 10A is moved and arranged on the filled concrete 27 in which the filled concrete through hole part 27h is formed in the new floor slab construction process and the paving 28 of the plurality of precast floor slabs 25. Similar to the existing floor slab protective fence part fixing process described above, in the new floor slab protective fence part fixing process, the bolt which is the bar 31 is screwed into the plate hole part 13h and integrated with the protective fence part 10A, and is transported and arranged by a construction machine or the like in a state of protruding below the support base plate 13A of the protective fence part 10A.

[0054] In the new floor slab protective fence part fixing process, the protective fence part 10A is fixed on the filled concrete 27 and the paving 28 of the plurality of precast floor slabs 25 by the fixing member 30 (bar 31) inserted into the filled concrete through hole part 27h formed in the first new floor slab construction process. Similar to the existing floor slab protective fence part fixing process described above, in the new floor slab protective fence part fixing process, after the protective fence part 10A is arranged on the floor slab 23, the fastening member 32 is fitted to the bar 31 inserted into the filled concrete through hole part 27h by the work from the lower surface of the floor slab 23, so that the protective fence part 10A is fixed to the floor slab 23.

[0055] Note that, similar to the existing floor slab protective fence part fixing process, in the new floor slab protective fence part fixing process, in order to ensure the bearing area, a lower plate having a contact surface contacting the lower surface of the precast floor slab 25 and an insertion hole part through which the bar 31 is inserted may be applied. In the new floor slab protective fence part fixing process, after attaching the lower plate to the bar 31 so that the bar 31 inserted into the filled concrete through hole part 27h is further inserted into the insertion hole part of the lower plate, the fastening member 32 may be fitted to the bar 31, and the protective fence part 10A may be fixed by the fastening member 32 through the lower plate.

[0056] Similar to the above-described existing floor slab protection fence part fixing process, a bar 31 is inserted into the filling concrete through-hole part 27h, and immediately after the protection fence part 10A is arranged on the floor slab 23 and before the fastening member 32 is fitted to the bar 31, the protection fence part 10A is arranged on the floor slab 23 so as not to shift laterally. In this state, the protection fence part 10A functions as, for example, type A protection fence in the installation standards of protection fences by the Ministry of Land, Infrastructure, Transport and Tourism. Therefore, even immediately after the protection fence part 10A is arranged on the floor slab 23 and before the fastening member 32 is fitted to the bar 31, the lane 51 formed by the floor slab 23 can be used for the passage of the vehicle V.

[0057] Also, similar to the above-described existing floor slab protection fence part fixing process, the inner diameter of the filling concrete through-hole part 27h is sufficiently larger than the diameter of the bar 31. In a state where the fastening member 32 is fitted to the bar 31, it is preferable that the outer peripheral surface of the bar 31 inserted into the filling concrete through-hole part 27h and the inner peripheral surface of the filling concrete through-hole part 27h are not in contact. By making them non-contact, in a state where the fastening member 32 is fitted to the bar 31, the protection fence part 10A is fixed and secured to the floor slab 23 by the frictional force between the support base plate 13A and the floor slab 23 (filling concrete 27).

[0058] Thereby, the quality of the filling concrete 27 against traffic vibrations of the lane 51 provided for the passage of the vehicle V and the load at the time of contact of the vehicle V with the protection fence part 10A, etc. is ensured. In a state where the fastening member 32 is fitted to the bar 31, the protection fence part 10A functions as, for example, type SB protection fence in the installation standards of protection fences by the Ministry of Land, Infrastructure, Transport and Tourism. After the new floor slab protection fence part fixing process, the floor slab 22 is replaced next to the floor slab 21, and the newly installed floor slab 23 is used for the passage of the vehicle V during the replacement work of the floor slab 22.

[0059] As shown in FIGS. 4(A), 4(B), and 4(C), the guardrail 1A with the guardrail part 10A fixed to the newly installed floor slab 23 of the present embodiment includes the floor slab 23, the guardrail part 10A that partitions the road 50, the filling concrete through-hole part 27h (floor slab through-hole part 20h) that penetrates the floor slab 23 vertically, and the fixing member 30 (bar 31 and fastening member 32) that is inserted into the filling concrete through-hole part 27h and fixes the guardrail part 10A to the floor slab. The floor slab 23 has a plurality of precast floor slabs 25 arranged with spaces in the traveling direction of the road 50, and the filling concrete 27 cast in place between the plurality of precast floor slabs 25. The filling concrete through-hole part 27h is formed in the filling concrete 27.

[0060] The lane 51 partitioned by the above guardrail 1A is provided for the passage of the vehicle V. As shown in FIG. 3(D), in the floor slab replacement method of the present embodiment, after the new floor slab guardrail part fixing step, a second existing floor slab removal step of removing the existing floor slab 22 in the lane 52 is performed. Next, as shown in FIG. 3(E), the lane 51 partitioned by the guardrail 1A is provided for the passage of the vehicle V. In the floor slab replacement method of the present embodiment, a second new floor slab installation step of arranging a plurality of precast floor slabs 26 in the lane 52 from which the existing floor slab 22 has been removed in the second existing floor slab removal step is performed.

[0061] In the second new floor slab installation step, as shown in FIG. 3(F), a tensioning material 44 is inserted into a hole communicating with the precast floor slab 25 arranged in the first new floor slab installation step and the precast floor slab 26 arranged in the second new floor slab installation step, and a tensioning step of applying a tensile force to the precast floor slab 25 and the precast floor slab 26 by the tensioning material 44 is performed. Also, in the second new floor slab installation step, as shown in FIG. 3(G), the filling concrete 27 is cast in place between the plurality of precast floor slabs 26. Through the above second new floor slab installation step, a floor slab 24 having a plurality of precast floor slabs 26 arranged with spaces in the traveling direction of the road 50 and the filling concrete 27 cast in place between the plurality of precast floor slabs 26 is newly installed in the lane 52. A wall railing 43 is installed on the floor slab 24, and a pavement 28 is formed on the floor slab 24.

[0062] In addition, as shown in FIGS. 5(A) and 5(B), in the secondary floor slab new construction process, between when the precast floor slab 26 is placed on the lane 52 and until the tensioning process is completed, the precast floor slab 25 placed in the primary floor slab new construction process and the precast floor slab 26 placed in the secondary floor slab new construction process may be connected by the erection jig 70. The erection jig 70 includes an upper contact member 71 that contacts across the upper surfaces of the precast floor slab 25 and the precast floor slab 26, a lower contact member 72 that contacts across the lower surfaces of the precast floor slab 25 and the precast floor slab 26, and a pair of fastening members (clamps) 73 that fasten the upper contact member 71 and the lower contact member 72. By the erection jig 70, the precast floor slab 26 placed on the lane 52 and the precast floor slab 25 of the lane 51 that vibrates due to the passage of the vehicle V and is provided for use are also connected until the tensioning process is completed. Therefore, the displacement of the precast floor slabs 25 and 26 can be suppressed, and the construction accuracy can be improved.

[0063] When the precast floor slabs 25 and 26 are connected by the erection jig 70, for example, in the primary floor slab new construction process, in order to secure a space for arranging the erection jig 70, in the part 100 to 200 mm inside from the boundary of the precast floor slab 25 with the lane 52, the filling concrete 27 may not be placed and the paving 28 may not be formed. In the new floor slab protection fence part fixing process, similar to FIGS. 4(A), 4(B) and 4(C), the protection fence part 10A may be fixed on the filling concrete 27 and the paving 28 of the plurality of precast floor slabs 25.

[0064] Also, as shown in FIGS. 5(A) and 5(B), when the precast floor slabs 25 and 26 are connected by the erection jig 70, for example, in the first-stage new floor slab construction process, in order to secure a space for arranging the erection jig 70, in addition to not placing the filling concrete 27 in the part 100 to 200 mm inside from the boundary with the traffic lane 52 of the precast floor slab 25, in order to secure a space for arranging the guardrail part 10A, the paving 28 may not be formed in the part 200 to 400 mm inside from the boundary with the traffic lane 52 of the precast floor slab 25. In the new floor slab guardrail part fixing process, the guardrail part 10A is fixed via the height adjustment member 60 to the part where the paving 28 of the precast floor slab 25 is not formed so that the guardrail part 10A has an appropriate height with respect to the upper surface of the paving 28.

[0065] Also, as shown in FIGS. 6(A) and 6(B), when the precast floor slabs 25 and 26 are connected by the erection jig 70 and in the first-stage new floor slab construction process, the filling concrete 27 is not placed in the part 100 to 200 mm inside from the boundary with the traffic lane 52 of the precast floor slab 25 and the paving 28 is not formed in the part 200 to 400 mm inside from the boundary with the traffic lane 52 of the precast floor slab 25, for example, in the new floor slab guardrail part fixing process, the guardrail part 10A may be directly fixed to the part where the paving 28 of the precast floor slab 25 is not formed. When the guardrail part 10A is directly fixed to the part where the paving 28 of the precast floor slab 25 is not formed, the height of the guardrail part 10A may be increased corresponding to the thickness of the paving 28.

[0066] Note that for the part of the precast floor slab 25 where the filling concrete 27 is not placed and the paving 28 is not formed in the above first-stage new floor slab construction process, the filling concrete 27 is placed and the paving 28 is formed in a later process.

[0067] As shown in FIG. 3(G), a protective fence removal process for removing the protective fence portion 10A from the floor slab 23 is performed. In the protective fence removal process, the fixation by the fixing members 30 (bar 31 and fastening member 32) between the protective fence portion 10A fixed to the floor slab 23 and the floor slab 23 is released. Specifically, the nut, which is the fastening member 32, is removed from the bolt, which is the bar 31. After the protective fence portion 10A is removed by an erection machine or the like, the mortar plugging hole portion 27h is filled with a filling material such as mortar. The newly constructed lanes 51 and 52 with the floor slabs 23 and 24 are again made available for the passage of the vehicle V. In this way, the floor slab replacement method of the present embodiment is completed.

[0068] In addition, in the technology where a temporary protective fence is installed on the road, there is also a method in which a temporary protective fence made of reinforced concrete or steel is fixed to the floor slab by an anchor driven into the upper surface of the floor slab. However, in this method, the anchor needs to be driven on the side of the lane made available for vehicle passage in order to prevent the protective fence from falling due to vehicle contact. Therefore, in the conventional technology, first, a first temporary protective fence is placed on the existing floor slab between the lane made available for vehicle passage and the lane where traffic control is imposed. Next, a second temporary protective fence fixed by an anchor is arranged on the side of the lane where traffic control is imposed on the first temporary protective fence.

[0069] Here, traffic control is imposed on the lane that was previously made available for vehicle passage, and the lane where traffic control was imposed is made available for vehicle passage. In this state, an anchor is driven into the upper surface of the floor slab on the side of the lane where traffic control is imposed on the second temporary protective fence, and the temporary protective fence is fixed to the floor slab. The first temporary protective fence is removed. Traffic control is again imposed on the lane that was previously made available for vehicle passage on the side opposite to the side where the anchor of the second temporary protective fence was driven, and the lane where traffic control was imposed on the side where the anchor of the second temporary protective fence was driven is again made available for vehicle passage. In this state, for the first time, the replacement of the floor slab of the lane where traffic control was imposed is performed.

[0070] That is, the operation of driving in the anchor needs to be carried out on the side of the lane provided for vehicle passage, but traffic control is required in the lane for this operation. Therefore, in the conventional technology, in order to install the temporary protective fence, it is necessary to switch twice between the lane provided for vehicle passage and the lane with traffic control. Also, the operation of removing the anchor driven on the side of the lane provided for vehicle passage also requires traffic control in the lane for this operation. Therefore, in the conventional technology, in order to remove the temporary protective fence as well, it is necessary to switch twice between the lane provided for vehicle passage and the lane with traffic control. For this reason, in the conventional technology, the traffic control period related to the installation and removal of the temporary protective fence becomes long.

[0071] Also, in this method, as described above, it is necessary to install two temporary protective fences. In addition, since the width of each conventional temporary protective fence in the width direction of the road is fixed to the floor slab by the anchor driven into the upper surface of the floor slab, it is necessary to increase the width of the protective fence in the width direction of the road. For this reason, in this method, the traffic control range related to the installation and removal of the temporary protective fence is large. Furthermore, in this method, anchor holes are drilled in the newly installed precast floor slab, resulting in a decrease in the durability of the newly installed precast floor slab. Also, in this method, since the temporary protective fence is fixed to the floor slab by the anchor, the quality of the fixing part of the protective fence against traffic vibration in the lane provided for vehicle passage and the load at the time of contact between the vehicle and the protective fence is low.

[0072] On the one hand, preferably according to the present embodiment, in the guardrail 1A that partitions the road 50 formed by the floor slabs 21, 22, 23, 24, the floor slabs 22, 23, the guardrail part 10A that partitions the road 50, the floor slab through-hole part 20h that penetrates the floor slabs 22, 23 vertically, and the fixing member 30 that is inserted into the floor slab through-hole part 20h and fixes the guardrail part 10 to the floor slabs 22, 23 are provided. Since the guardrail part 10A is fixed to the floor slabs 22, 23 by the fixing member 30 that is inserted into the floor slab through-hole part 20h that penetrates the floor slabs 22, 23 vertically and fixes the guardrail part 10A to the floor slabs 22, 23, compared with the technique in which a temporary guardrail is fixed to the floor slab by an anchor driven from above the conventional floor slab, more of the work required to fix the guardrail part 10A to the floor slabs 22, 23 can be done from the lower surface of the floor slabs 22, 23. Therefore, the traffic control period required for installing the guardrail can be shortened.

[0073] Also, according to the present embodiment, in the floor slab replacement construction method, after the existing floor slab through-hole part forming step and the existing floor slab guardrail part fixing step in which the traffic control period is shortened, while a part of the lane 52 partitioned by the guardrail part 10A is provided for the passage of the vehicle V, the first existing floor slab removal step of removing the existing floor slab 22 in the other lane 51 and the first floor slab new construction step of arranging the precast floor slab 25 in the other lane 51 are performed, so that the period during which the road 50 can be provided for the passage of the vehicle V can be made longer.

[0074] Also, according to the present embodiment, in the new floor slab guardrail part fixing step in the floor slab replacement construction method, the fixing by the fixing member 30 between the guardrail part 10A fixed to the existing floor slab 22 and the existing floor slab 22 in the existing floor slab guardrail part fixing step is released, the guardrail part 10A is moved and arranged on the filling concrete 27 in which the filling concrete through-hole part 27h is formed and the plurality of precast floor slabs 25 in the floor slab new construction step, and the guardrail part 10A is fixed to the filling concrete 27 and the plurality of precast floor slabs 25 by the fixing member 30 inserted into the filling concrete through-hole part 27h formed in the floor slab new construction step. Therefore, the traffic control period required to move the guardrail part 10A from the existing floor slab 22 and install it on the precast floor slab 25 can be shortened.

[0075] In addition, after the fixed work of the newly installed floor slab protection fence part with the shortened traffic control period, while making the lane 51 partitioned by the protection fence part 10A available for vehicle passage, a secondary existing floor slab removal work for removing the existing floor slab 22 in the lane 52 and a secondary floor slab installation work for arranging the precast floor slab 26 in the lane 52 are carried out. Therefore, the period during which the road 50 can be made available for the passage of the vehicle V can be extended.

[0076] In addition, according to the present embodiment, there is no need to switch between the lane used for vehicle passage and the lane subject to traffic control for the installation and removal of the temporary protection fence. Therefore, according to the present embodiment, the traffic control period related to the installation and removal of the temporary protection fence can also be shortened for the period of switching the lanes.

[0077] In addition, according to the present embodiment, it is not necessary to install two temporary protection fences. Further, the width of the protection fence part 10A of the present embodiment in the width direction of the road can be made narrower than that of the conventional temporary protection fence because the protection fence part 10A is fixed to the floor slabs 22 and 23 by the fixing member 30 inserted through the floor slab through hole part 20h. Therefore, according to the present embodiment, the traffic control range related to the installation and removal of the temporary protection fence can be reduced.

[0078] In addition, according to the protection fence 1A of the present embodiment, in the floor slab 23 having a plurality of precast floor slabs 25 arranged at intervals in the traveling direction of the road 50 and the filling concrete 27 cast in place between the plurality of precast floor slabs 25, the filling concrete through hole part 27h is formed in the filling concrete 27, and since the precast floor slab 25 mainly constituting the floor slab 23 is not provided with holes, the durability of the floor slab 23 is improved.

[0079] That is, in the present embodiment, no anchor holes are drilled in the newly installed precast floor slab 25, ensuring the high durability of the newly installed precast floor slab 25. Further, in the present embodiment, the guardrail portion 10A is fixed to the floor slab 23 by the frictional force between the support base plate 13A and the floor slab 23. Therefore, the quality of the fixing portion of the guardrail portion 10A against traffic vibrations in the traffic lane 51 provided for the passage of the vehicle V and loads when the vehicle V contacts the guardrail portion 10A is ensured.

[0080] Further, in the present embodiment, there is no work such as fixing of the anchor on the upper surfaces of the floor slabs 22 and 23. Therefore, the safety of the work during installation and removal of the guardrail portion 10A is ensured. Further, in the present embodiment, since the guardrail portion 10A is made of steel, the guardrail portion 10A is lighter than a conventional reinforced concrete guardrail. Therefore, even when the guardrail portion 10A is installed on the existing floor slab 22 which is divided into two parts, the existing floor slab 22, and is in a cantilever state, reinforcement of the existing floor slab 22 is not required, and the influence on the existing floor slab 22 can be reduced. Further, since the guardrail portion 10A of the present embodiment has a simple structure in which the guardrail portion 10A is fixed to the floor slabs 22 and 23 by the fixing member 30 inserted through the floor slab through-hole portion 20h, it can be made less expensive than a conventional temporary guardrail.

[0081] Further, according to the method for installing the guardrail of the present embodiment, in the floor slab new construction step, after a plurality of precast floor slabs 25 are arranged side by side with a space therebetween in the advancing direction of the road 50 in place of the existing ones, the packing concrete 27 is cast in place between the plurality of precast floor slabs 25. In the floor slab through-hole portion forming step, when the packing concrete 27 is cast in place in the floor slab new construction step, the packing concrete through-hole portion 27h is formed in the packing concrete 27. Therefore, the on-site casting of the packing concrete 27 and the formation of the packing concrete through-hole portion 27h can be carried out together, and the formation of the packing concrete through-hole portion 27h becomes easy.

[0082] Also, according to the method of installing the protective fence of the present embodiment, the fixing member 30 is composed of a bar 31 protruding downward from the protective fence portion 10A and a fastening member 32 fitted to the bar 31. In the protective fence portion fixing step, the bar is inserted into the floor slab through-hole portion 20h formed by the floor slab through-hole portion forming step, and the protective fence portion 10A is disposed on the floor slabs 22 and 23. Therefore, immediately after the protective fence portion 10A is disposed on the floor slabs 22 and 23, the protective fence portion 10A is disposed on the floor slabs 22 and 23 so as not to shift laterally. Further, in the protective fence portion fixing step, the fastening member 32 is fitted to the bar 31 inserted into the floor slab through-hole portion 20h, whereby the protective fence portion 10A is fixed to the floor slabs 22 and 23. Therefore, in the protective fence portion fixing step, more of the work necessary for fixing the protective fence portion 10A to the floor slabs 22 and 23 can be performed from the lower surface of the floor slabs 22 and 23. Accordingly, the traffic control period required for installing the protective fence portion 10A can be shortened.

[0083] Hereinafter, the protective fence according to the second embodiment of the present invention will be described. As shown in FIGS. 7(A), 7(B), and 7(C), the protective fence 1B of the present embodiment includes a protective fence portion 10B instead of the protective fence portion 10A of the first embodiment. The protective fence portion 10B includes a beam 12B supported from below at the upper end portion of the column 11A and extending along the traveling direction of the road 50. Further, the protective fence portion 10B includes beams 12C extending along the traveling direction of the road 50 on the side surface on the lane 51 side and the side surface on the lane 52 side of the column 11A at two positions in the middle in the height direction of the column 11A.

[0084] The protective fence portion 10B includes a net 18 instead of the protective plate 15 of the protective fence portion 10A of the first embodiment. The net 18 is supported by the central portions of the side surfaces of the column 11A on the traveling direction side and the side opposite to the traveling direction of the road 50, the central portion of the lower surface of the beam 12B, and the central portion of the upper surface of the column base plate 13A. The net 18 extends in a direction orthogonal to the upper surface of the floor slab 23 and along the traveling direction of the road 50. The net 18 is made of metal or synthetic resin.

[0085] In the present embodiment, since the protection fence portion 10B includes the net 18 instead of the protection plate 15, the durability against the load due to the wind on the road 50 can be improved.

[0086] Hereinafter, the protection fence according to the third embodiment of the present invention will be described. As shown in FIGS. 8(A), 8(B), and 8(C), the protection fence 1C of the present embodiment includes a protection fence portion 10C instead of the protection fence portion 10A of the first embodiment. The protection fence portion 10C includes an opening portion 16A that opens in the vicinity of the support base plate 13A in the protection plates 15 on both the lane 51 side where the vehicle V passes and the lane 52 side where the replacement work of the floor slab 22 is performed.

[0087] In the present embodiment, for example, in the step of fixing the newly installed floor slab protection fence portion, even if the bolts, which are the bars 31, are not pre-screwed into the plate hole portions 13h, after the protection fence portion 10B is arranged on the floor slab 23, the worker puts his hand into the opening portion 16A from the lane 52 side where the replacement work of the floor slab 22 is performed and performs the work, so that while the lane 51 is provided for the passage of the vehicle V, the bar 31 can be inserted through the plate hole portions 13h and the filled concrete through hole portions 27h.

[0088] As shown in FIG. 8(D), after the protection fence portion 10C is arranged on the floor slab 23, during the period until the bar 31 is inserted through the plate hole portions 13h and the filled concrete through hole portions 27h, the protection fence portion 10C may be prevented from shifting to the floor slab 22 side due to contact with the vehicle V or the like by the temporary reinforcing material 17 that can move on the floor slab 22 by means of casters or the like. If necessary from the viewpoint of the guiding property of the vehicle V that has contacted the protection fence portion 10C, the opening portion 16A of the protection plate 15 on the lane 51 side provided for the passage of the vehicle V may be blocked by a detachable steel plate.

[0089] The protective fence part 10C of this embodiment can also be applied in the existing floor slab protective fence part fixing process. In this case, in the existing floor slab through-hole part forming process, as the type-A protective fence in the installation standard of the protective fence by the Ministry of Land, Infrastructure, Transport and Tourism, after the protective fence part 10C is displaced to the existing floor slab 21 side from its original arranged position on the existing floor slab 22, the existing floor slab through-hole part 22h may be formed on the floor slab 22 side of the protective fence part 10C.

[0090] Hereinafter, the protective fence according to the fourth embodiment of the present invention will be described. As shown in FIGS. 9(A), 9(B) and 9(C), the protective fence 1D of this embodiment includes a protective fence part 10D instead of the protective fence part 10A of the first embodiment. The protective fence part 10D is made of reinforced concrete and does not have the beam 12A and the protective plate 15. The protective fence part 10D has the support column 11B, the support column base plate 13B, the reinforcing rib 14B and the opening 16B. The support column 11B is a steel pipe whose tip is embedded in the reinforced concrete of the protective fence part 10D. The support column base plate 13B is the same steel plate as the support column base plate 13A of the first embodiment and includes the plate hole part 13h. The reinforcing rib 14B is the same as the reinforcing rib 14A of the first embodiment.

[0091] The opening 16B is a through-hole part that penetrates between the lane 51 side for the passage of the vehicle V and the lane 52 side where the work of replacing the floor slab 22 is carried out, in the vicinity of the support column base plate 13B. The opening 16B exhibits the same function as the opening 16A of the third embodiment. Similar to the third embodiment, when necessary from the viewpoint of the guiding property of the vehicle V that has come into contact with the protective fence part 10C, the lane 51 side for the passage of the vehicle V of the opening 16B may be blocked by a detachable steel plate.

[0092] Note that the protective fence portion 10D of this embodiment is made of reinforced concrete and is heavier than the steel protective fence portion 10A of the first embodiment. Therefore, the bolts, which are the bars 31, are not pre-screwed into the plate hole portions 13h. Even during the period until the bars 31 are inserted through the plate hole portions 13h and the filling concrete through-hole portions 27h after the protective fence portion 10D is arranged on the floor slab 23, it is possible to prevent the protective fence portion 10B from shifting toward the floor slab 22 side due to contact with the vehicle V or the like without requiring the temporary reinforcing material 17 as in the second embodiment.

[0093] Hereinafter, a protective fence and an installation method of the protective fence according to a fifth embodiment of the present invention will be described. As shown in FIGS. 10(A), 10(B), and 10(C), the protective fence 1E of this embodiment includes a first protective fence portion 10e extending along the lanes 51 and 52 of the road 50 partitioned by the protective fence 1E, instead of the protective fence portion 10A of the first embodiment, and a second protective fence portion 10E continuously extending along the lanes 51 and 52 in connection with the first protective fence portion 10e. In this embodiment, the first protective fence portion 10e and the second protective fence portion 10E have the same configuration.

[0094] As shown in FIGS. 10(A), 10(B), 10(C), 11(A), 11(B), and 11(C), the connecting portion 19A connecting the first protective fence portion 10e and the second protective fence portion 10E has a convex portion 19a on one side and a concave portion 19b on the other side when viewed vertically, and the convex portion 19a and the concave portion 19b are mutually engageable. Further, the convex portion 19a and the concave portion 19b have locking portions 19x and 19y that restrict movement in the direction along the lanes 51 and 52.

[0095] In this embodiment, since the first protective fence portion 10e and the second protective fence portion 10E have the same configuration, the first protective fence portion 10e and the second protective fence portion 10E have a convex portion 19a on one connecting portion 19A and a concave portion 19b on the other connecting portion 19A. Note that, for example, the first protective fence portion 10e may have either the convex portion 19a or the concave portion 19b on both connecting portions 19A, and the second protective fence portion 10E may have the other of the convex portion 19a and the concave portion 19b on both connecting portions 19A.

[0096] The first protective fence part 10e and the second protective fence part 10E have a support column 11C, a beam 12D, a beam 12E, and a support column base plate 13C. The beam 12D is supported from below at the upper ends of two support columns 11C and extends along the traveling direction of the road 50. The beam 12E extends along the traveling direction of the road 50 on the side surface on the lane 51 side and the side surface on the lane 52 side of the support column 11C at two positions in the middle in the height direction of two support columns 11C. Both ends of the beams 12D and 12E are located at the same position spaced apart from the support column 11C in a vertical view. The support column base plate 13C is a steel plate similar to the support column base plate 13A of the first embodiment and includes a plate hole portion 13h.

[0097] The first protective fence part 10e and the second protective fence part 10E have a fitting vertical member 19v at one connection part 19A. The fitting vertical member 19v extends vertically from the upper end of the beam 12, passes between the upper two beams 12E and between the lower two beams 12E, and reaches the lower end of the lower beam 12E. A part of the fitting vertical member 19v protrudes from the ends of the beams 12D and 12E in a vertical view. The part of the fitting vertical member 19v protruding from the ends of the beams 12D and 12E forms a convex part 19a. Protrusions protrude from the side surface on the lane 51 side and the side surface on the lane 52 side of the tip of the convex part 19a in a vertical view. The protrusions protrude over the entire vertical range of the fitting vertical member 19v forming the convex part 19a. The protrusions form a locking part 19x.

[0098] The first protective fence part 10e and the second protective fence part 10E have notches corresponding to the shape of the convex part 19a in a vertical view on the beams 12D and 12E of the other connection part 19A. The notches form concave parts 19b. In a vertical view, the notches further include a portion recessed in the lateral direction intersecting the lanes 51 and 52 and capable of accommodating the protrusions of the recessed locking part 19x. The portion of the notches recessed in the lateral direction intersecting the lanes 51 and 52 forms a locking part 19y. The convex part 19a and the concave part 19b are composed of surfaces extending in the vertical direction. The convex part 19a and the concave part 19b face each other such that the surfaces extending in the vertical direction are in contact with each other and fit together. The mutually fitted convex part 19a and concave part 19b are slidable relative to each other in the vertical direction and restrict each other's movement in the lateral direction intersecting the lanes 51 and 52.

[0099] The locking part 19x protrudes in the lateral direction intersecting the lanes 51 and 52. The locking part 19y is recessed in the lateral direction intersecting the lanes 51 and 52. By engaging the locking part 19x and the locking part 19y with each other, the convex part 19a and the concave part 19b that are fitted to each other restrict the movement in the direction of separating from each other. Therefore, the first protection fence part 10e and the second protection fence part 10E are fitted to each other at the connection part 19A.

[0100] Further, similar to the first embodiment, the protection fence 1E of the present embodiment includes a floor slab through-hole part 20h that penetrates the floor slab 23 vertically, and a bar 31 protruding below the first protection fence part 10e and the second protection fence part 10E, and is inserted into the floor slab through-hole part 20h, and includes a fixing member 30 that fixes the first protection fence part 10e and the second protection fence part 10E to the floor slab 23. The floor slab through-hole part 20h is a packed concrete through-hole part 27h, similar to the protection fence 1A of the first embodiment. The protection fence 1E of the present embodiment can be applied to both the floor slab 22 and the floor slab 23, similar to the protection fence 1A of the first embodiment.

[0101] In the method for installing the protection fence of the present embodiment, as shown in FIG. 11(C), in the existing floor slab protection fence part fixing step and the new floor slab protection fence part fixing step in the floor slab replacement construction method of the first embodiment, a first protection fence part installation step of installing the first protection fence part 10e so as to extend along the lanes 51 and 52 of the road 50 partitioned by the protection fence 1E is performed. Further, a second protection fence part installation step of installing the second protection fence part 10E so as to extend along the lanes 51 and 52 continuously with the first protection fence part 10e installed in the first protection fence part installation step is performed.

[0102] In the first protective fence section installation process and the second protective fence section installation process, for the connecting part 19A that connects the first protective fence section 10e and the second protective fence section 10E, when viewed vertically, it has a convex part 19a on one side and a concave part 19b on the other side, and the convex part 19a and the concave part 19b are capable of fitting together. The first protective fence section 10e and the second protective fence section 10E are installed. As shown in Fig. 11(C), in the second protective fence section installation process, the convex part 19a and the concave part 19b are fitted together with each other. By the mutually fitted convex part 19a and concave part 19b, a hoisting machine such as a erection machine is used for the first protective fence section 10e installed in the first protective fence section installation process, and the second protective fence section 10E is lifted and lowered in the vertical direction and slid downward to install the second protective fence section 10E.

[0103] In the first protective fence section installation process and the second protective fence section installation process, the convex part 19a and the concave part 19b are provided with locking parts 19x, 19y that restrict movement in the direction along the lanes 51, 52. The first protective fence section 10e and the second protective fence section 10E are installed. In the second protective fence section installation process, while engaging the locking part 19x and the locking part 19y with each other, the convex part 19a and the concave part 19b are fitted together with each other, restricting the movement of the mutually fitted convex part 19a and concave part 19b in the direction of separating from each other, and sliding the second protective fence section 10E downward with respect to the first protective fence section 10e installed in the first protective fence section installation process to install the second protective fence section 10E.

[0104] In the first protective fence section installation process, on the floor slabs 22, 23 having floor slab through-hole parts 20h that penetrate the floor slabs 22, 23 vertically, the first protective fence section 10e is composed of a bar 31 protruding downward from the first protective fence section 10e and has a fixing member 30 for fixing the first protective fence section 10e to the floor slabs 22, 23. The first protective fence section 10e is installed while inserting the bar 31 into the floor slab through-hole part 20h. In the second protective fence section installation process, on the floor slabs 22, 23 having floor slab through-hole parts 20h, the second protective fence section 20E is composed of a bar 31 protruding downward from the second protective fence section 10E and has a fixing member 30 for fixing the second protective fence section 20E to the floor slabs 22, 23. The second protective fence section 20E is installed while inserting the bar 31 into the floor slab through-hole part 20h.

[0105] When installing the first protective fence part 10e and the second protective fence part 10E on the floor slab 23 newly installed in the first protective fence part installation process and the second protective fence part installation process, in the first protective fence part installation process and the second protective fence part installation process, the first protective fence part 10e and the second protective fence part 10E are installed while inserting the bar 31 through the plugged concrete through-hole part 27h.

[0106] In FIG. 11(C), by repeating the installation of the second protective fence part 10E by the same second protective fence part installation process as above so as to continuously extend along the lanes 51, 52 of the road 50 continuously with the second protective fence part 10E installed in the second protective fence part installation process, the first protective fence part 10e and the second protective fence part 10E that continuously extend along the lanes 51, 52 of the road 50 can be installed. Note that, depending on the situation, for example, between two first protective fence parts 10e installed at intervals corresponding to the second protective fence part 10E along the lanes 51, 52 of the road 50 in the first protective fence part installation process, the second protective fence part 10E may be installed by the same second protective fence part installation process as above so as to continuously extend along the lanes 51, 52 of the road 50 continuously with each of the first protective fence parts 10e.

[0107] According to the present embodiment, in the protective fence 1E that partitions the road 50 formed by the floor slabs 22, 23, the protective fence 1E includes a first protective fence part 10e that extends along the lanes 51, 52 of the road 50 partitioned by the protective fence 1E, and a second protective fence part 10E that continuously extends along the lanes 51, 52 continuously with the first protective fence part 10e. However, the connection part 19A that connects the first protective fence part 10e and the second protective fence part 10E has a convex part 19a on one side and a concave part 19b on the other side when viewed vertically, and since the convex part 19a and the concave part 19b can be fitted, it is easy to connect the first protective fence part 10e and the second protective fence part 10E, and the traffic control period required for installing the protective fence 1E can be shortened.

[0108] Further, according to the present embodiment, since the convex portions 19a and the concave portions 19b have the locking portions 19x and 19y that restrict movement in the direction along the lanes 51 and 52, it is easy to connect the first protective fence portion 10e and the second protective fence portion 10E, and the traffic control period required for installing the protective fence 1E can be shortened.

[0109] Further, according to the present embodiment, the fixing members 30 that are inserted into the floor slab through holes 20h penetrating the floor slabs 22 and 23 up and down and fix the first protective fence portion 10e and the second protective fence portion 10E to the floor slabs 22 and 23 fix the first protective fence portion 10e and the second protective fence portion 10E to the floor slabs 22 and 23. Therefore, compared with the technique in which a temporary protective fence is fixed to the floor slab by an anchor driven into the upper surface of the conventional floor slab, more of the work required to fix the protective fence portion to the floor slab can be done from the lower surface of the floor slab. Therefore, the traffic control period required for installing the protective fence can be shortened. Further, since the first protective fence portion 10e and the second protective fence portion 10E are fitted and connected at the connecting portion 19A, they have strength enough to withstand the impact of a vehicle deviating from the lane.

[0110] Hereinafter, a protective fence and a method for installing the protective fence according to the sixth embodiment of the present invention will be described. As shown in FIGS. 12(A) and 12(B), the protective fence 1F of the present embodiment includes a first protective fence portion 10f and a second protective fence portion 10F instead of the first protective fence portion 10e and the second protective fence portion 10E of the fifth embodiment. In the present embodiment, the first protective fence portion 10f and the second protective fence portion 10F have the same configuration. As shown in FIGS. 12(A), 12(B), 13(A), 13(B), and 13(C), the connecting portion 19B that connects the first protective fence portion 10f and the second protective fence portion 10F has a convex portion 19m on one side and a concave portion 19n on the other side when viewed vertically, and the convex portion 19m and the concave portion 19n can be fitted to each other.

[0111] The beam 12D is supported from below at the upper ends of the three columns 11C and extends along the traveling direction of the road 50. The beam 12E extends along the traveling direction of the road 50 on the side surfaces of the three columns 11C on the lane 51 side and the lane 52 side at two intermediate positions in the height direction of the three columns 11C.

[0112] In this embodiment, since the first protective fence portion 10f and the second protective fence portion 10F have the same configuration, the first protective fence portion 10f and the second protective fence portion 10F have a convex portion 19m at one connecting portion 19B and a concave portion 19n at the other connecting portion 19B. For example, the first protective fence portion 10f may have either a convex portion 19m or a concave portion 19n at both connecting portions 19B, and the second protective fence portion 10F may have the other of the convex portion 19m and the concave portion 19n at both connecting portions 19B.

[0113] The first protective fence portion 10f and the second protective fence portion 10F have a convex portion 19m that protrudes in a rectangular shape when viewed vertically at the end of the beam 12D of one connecting portion 19B. A bridging member 19p is bridged between the ends of the two upper beams 12E and between the ends of the two lower beams 12E of one connecting portion 19B. The first protective fence portion 10f and the second protective fence portion 10F have a convex portion 19m that protrudes in a rectangular shape when viewed vertically at the ends of the upper and lower bridging members 19p.

[0114] Also, the first protective fence portion 10f and the second protective fence portion 10F have a concave portion 19n that is recessed in a rectangular shape when viewed vertically at the end of the beam 12D of the other connecting portion 19B. A bridging member 19q is bridged between the ends of the two upper beams 12E and between the ends of the two lower beams 12E of the other connecting portion 19B. The first protective fence portion 10f and the second protective fence portion 10F have a concave portion 19n that is recessed in a rectangular shape when viewed vertically at the ends of the upper and lower bridging members 19q.

[0115] The convex portion 19m and the concave portion 19n are formed by surfaces extending in the vertical direction. The convex portion 19m and the concave portion 19n face each other such that the surfaces extending in the vertical direction are in contact with each other and fit together. The mutually fitted convex portion 19m and concave portion 19n are slidable relative to each other in the vertical direction and restrict movement in the lateral direction intersecting the lanes 51, 52.

[0116] Note that the convex portion 19m may protrude in a shape other than a rectangular shape such as a trapezoidal shape when viewed vertically, for example. Further, the concave portion 19n may be recessed in a shape other than a rectangular shape such as a trapezoidal shape when viewed vertically. Further, the connecting portion 19B formed by the convex portion 19m and the concave portion 19n of the present embodiment may be formed by any one of a stagger joint, a dovetail joint, a miter joint, a double miter joint, a grooved stagger joint, a grooved dovetail joint, a grooved miter joint, a double covered miter joint, a hidden stagger joint, a sitting dovetail joint, a sitting miter joint, a double covered floor miter joint, a box stagger joint, and a four-way miter joint.

[0117] Further, the convex portion 19m and the concave portion 19n of the present embodiment do not have the locking portions 19x and 19y like the convex portion 19a and the concave portion 19b of the fifth embodiment, but the convex portion 19m and the concave portion 19n fitted to each other by any one of a dovetail joint, a miter joint, a double miter joint, a grooved dovetail joint, a grooved miter joint, a double covered miter joint, a sitting dovetail joint, a sitting miter joint, a double covered floor miter joint, and a four-way miter joint may restrict the movement of each other in the direction of separation. According to the present embodiment, the connecting portion 19B can be formed with a simple structure.

[0118] As shown in FIG. 13(C), also in the installation method of the protective fence of the present embodiment, similar to the fifth embodiment, a first protective fence portion installation step of installing the first protective fence portion 10f and a second protective fence portion installation step of installing the second protective fence portion 10F are performed. In FIG. 13(C), by repeating the installation of the second protective fence portion 10F so as to extend continuously along the lanes 51 and 52 of the road 50 continuously with respect to the second protective fence portion 10F installed in the second protective fence portion installation step, the first protective fence portion 10f and the second protective fence portion 10F that extend continuously along the lanes 51 and 52 of the road 50 can be installed. Further, depending on the situation, for example, between two first protective fence portions 10f installed at intervals corresponding to the second protective fence portion 10F along the lanes 51 and 52 of the road 50 in the first protective fence portion installation step, the second protective fence portion 10F may be installed so as to extend continuously along the lanes 51 and 52 of the road 50 for each of the first protective fence portions 10f.

[0119] The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments and can be implemented in various forms. For example, in the above embodiments, the configurations and quantities of the beams 12A, 12B, 12C, 12D, 12E, the reinforcing ribs 14A, 14B, the protective plate 15, the net 18, and the fixing member 30 can be appropriately changed.

Explanation of Signs

[0120] 1A, 1B, 1C, 1D, 1E, 1F... protective fences, 10A, 10B, 10C, 10D... protective fence parts, 10e... first protective fence part, 10E... second protective fence part, 10f... first protective fence part, 10F... second protective fence part, 11A, 11B, 11C... columns, 12A, 12B, 12C, 12D, 12E... beams, 13A, 13B, 13C... column base plates, 13h... plate hole parts, 14A, 14B... reinforcing ribs, 15... protective plate, 16A, 16B... openings, 17... temporary reinforcing material, 18... net, 19A, 19B... connecting parts, 19v... fitting vertical members, 19a... convex parts, 19b... concave parts, 19x, 19y... locking parts, 19m... convex parts, 19n... concave parts, 19p, 19q... bridging members, 20, 21, 22, 23, 24... floor slabs, 20h... floor slab through hole parts, 22h... existing floor slab through hole parts, 25, 26... precast floor slabs, 27... infill concrete, 27h... infill concrete through hole parts, 28... paving, 30... fixing member, 31... bars, 32... fastening members, 41... bridge girders, 42, 43... wall parapets, 44... tension members, 50... road, 51, 52... lanes, 60... height adjusting material, 70... erection jig, 71... upper contact member, 72... lower contact member, 73... fastening member (clamp), V... vehicle.

Claims

1. A method for installing a protective fence for replacing a road slab having a plurality of lanes, comprising: a step of installing a plurality of precast slabs on a lane from which an existing slab has been removed; In the step of installing the new slab, after arranging the plurality of precast slabs side by side with a space therebetween in the traveling direction of the lane, cast-in-place concrete is placed between the plurality of precast slabs. When placing the cast-in-place concrete, a cast-in-place concrete through-hole portion that penetrates the cast-in-place concrete vertically is formed; a step of fixing a protective fence portion to the cast-in-place concrete and the plurality of precast slabs by arranging a protective fence portion on the cast-in-place concrete and the plurality of precast slabs in which the cast-in-place concrete through-hole portion is formed in the step of installing the new slab, and inserting a fixing member through the cast-in-place concrete through-hole portion formed in the step of installing the new slab; a step of removing an existing slab in some lanes after the step of fixing the protective fence portion of the newly installed slab; the step of installing a plurality of precast slabs on the some lanes from which the existing slab has been removed in the step of removing the existing slab; further comprising: the slab; the protective fence portion that divides the road; a slab through-hole portion that penetrates the slab vertically; a fixing member that is inserted through the slab through-hole portion and fixes the protective fence portion to the slab; comprising: A method for installing a protective fence.

2. A slab, a protective fence portion that divides the road, a slab through-hole portion that penetrates the slab vertically, a fixing member that is inserted through the slab through-hole portion and fixes the protective fence portion to the slab, comprising: The slab includes a plurality of precast slabs arranged side by side with a space therebetween in the traveling direction of the road, and cast-in-place concrete placed between the plurality of precast slabs. A method for installing a protective fence, wherein the slab through-hole portion is formed in the cast-in-place concrete, and when the cast-in-place concrete is placed, a cast-in-place concrete through-hole portion that penetrates the cast-in-place concrete vertically is formed. A method for installing a protective fence.

3. A formwork corresponding to the shape of the cast-in-place concrete through-hole portion is arranged. The method for installing a protective fence according to Claim 1 or Claim 2.

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