Construction method for wall railings

Abstract

This invention provides a construction method for wall railings that can prevent concrete cracking and insufficient filling. [Solution] A method for constructing a parapet wall according to one embodiment involves constructing a parapet wall at each end of a plurality of deck slabs 5 constituting the bridge girder of a bridge in the direction D2 perpendicular to the bridge axis. The method for constructing a parapet wall comprises the steps of: performing cantilever construction of the bridge girder on the bridge; constructing the outer part 6A of the parapet wall located on the end side of the location P on the deck slab 5 where the parapet wall wall is to be constructed in the direction D2 perpendicular to the bridge axis while the cantilever construction is being performed; and constructing the inner part of the parapet wall wall at a location other than the outer part 6A of the parapet wall wall at the location where the parapet wall wall is to be constructed after the cantilever construction is completed.

Description

Technical Field

[0001] This disclosure relates to a construction method for a wall railing.

Background Art

[0002] Patent Document 1 describes a method for constructing a bridge railing. The method for constructing a bridge railing includes a step of constructing reinforcing bars, a step of constructing reinforced concrete for the rising part, a step of installing a formwork, and a step of filling a filler. In the step of constructing the reinforcing bars, the reinforcing bars for the railing part are constructed on a scaffold suspended from a wagon installed on the bridge girder of the bridge.

[0003] In the step of constructing the reinforced concrete for the rising part, on the scaffold installed on the wagon, the concrete for the part excluding the covering part of the inner surface and the top end surface of the railing part is placed to construct the reinforced concrete for the rising part. In the step of installing the formwork, an embedded formwork and a formwork are installed on each of the inner surface of the reinforced concrete for the rising part and the top end surface of the reinforced concrete for the rising part. In the step of filling the filler, the filler is filled into the space defined by the reinforced concrete for the rising part, the embedded formwork, and the formwork, respectively.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the above-described method for constructing a bridge railing, on the scaffold installed on the wagon, the concrete for the part excluding the covering part of the inner surface and the top end surface of the railing part is placed to construct the reinforced concrete for the rising part. And after removing the wagon, the inner surface of the railing part and the covering part of the top end surface of the railing part are constructed.

[0006] Incidentally, when the thin inner surface of a wall parapet is constructed later, the inner surface is constrained by the internal concrete, which can cause shrinkage and cracking during the hardening of the concrete. Preventing cracking may require special fillers, potentially increasing the cost of these materials. The inner surface of a wall parapet requires concrete to be poured without gaps. However, when the thin inner surface of a wall parapet is constructed later, especially when using concrete containing large aggregates or concrete with low fluidity, there is a concern that gaps may form in the concrete, resulting in insufficient filling.

[0007] This disclosure aims to provide a method for constructing wall railings that can prevent concrete cracking and poor filling. [Means for solving the problem]

[0008] (1) The method for constructing a parapet wall according to this disclosure involves constructing a parapet wall at each of the ends of a plurality of deck slabs constituting the bridge girder of a bridge in the direction perpendicular to the bridge axis. The method for constructing a parapet wall comprises the steps of: performing cantilever construction of the bridge girder on the bridge; constructing the outer part of the parapet wall located on the end side in the direction perpendicular to the bridge axis of the location on the deck slab where the parapet wall wall is to be constructed while the cantilever construction is being performed; and after the cantilever construction is completed, constructing the inner part of the parapet wall at a location other than the outer part of the parapet wall wall at the location where the parapet wall wall is to be constructed.

[0009] In this parapet construction method, the bridge girders are cantilevered, and parapets are constructed at both ends of the multiple deck slabs that make up the bridge girders, perpendicular to the bridge axis. While the cantilever construction is being carried out, the outer part of the parapet is constructed on the end perpendicular to the bridge axis of the area on the deck slab where the parapet is to be constructed. Since the outer part of the parapet, which is part of the parapet, is constructed during the cantilever construction, a portion of the parapet can be constructed in advance during the cantilever construction. Then, after the cantilever construction is completed, the inner part of the parapet is constructed in the area other than the outer part of the parapet where it is to be constructed. Therefore, cracks are less likely to occur when the cement-based material that makes up the inner part of the parapet hardens. Furthermore, even when using cement-based materials that contain large aggregates or cement-based materials with low fluidity, it is possible to prevent poor filling of the cement-based material when constructing the inner part of the parapet.

[0010] (2) In the step of constructing the inner part of the wall parapet in (1) above, the inner part of the wall parapet may be constructed to be thicker than the outer part of the wall parapet. In this case, cracks that occur when the cement-based material constituting the inner part of the wall parapet hardens can be made less likely to occur. Furthermore, because the inner part of the wall parapet, which is constructed later, is thicker than the outer part of the wall parapet, even when using cement-based material containing large aggregates or cement-based material with low fluidity, poor filling of the cement-based material during the construction of the inner part of the wall parapet can be prevented more reliably.

[0011] (3) In (1) or (2) above, the step of constructing the outer part of the wall parapet may include the steps of installing an outer formwork that extends upward relative to the end face of the deck slab facing perpendicular to the bridge axis, and pouring cement-based material into the inner side of the outer formwork in the direction perpendicular to the bridge axis. In this case, an outer formwork that extends upward relative to the end face of the deck slab facing perpendicular to the bridge axis is installed, and cement-based material is poured into the inner side of the outer formwork in the direction perpendicular to the bridge axis. Thus, the outer part of the wall parapet can be constructed efficiently.

[0012] (4) In (3) above, the step of constructing the outer part of the wall parapet may include the step of installing the inner formwork on the inside of the outer formwork in the direction perpendicular to the bridge axis, and in the step of pouring cement-based material, the cement-based material may be poured between the outer formwork and the inner formwork. In this case, the inner formwork is installed on the inside of the outer formwork in the direction perpendicular to the bridge axis, and the cement-based material is poured between the outer formwork and the inner formwork. Therefore, the construction of the outer part of the wall parapet can be carried out more efficiently.

[0013] (5) In (4) above, the inner formwork may be embedded formwork. In this case, since it is not necessary to remove the inner formwork after the construction of the outer part of the wall parapet, the construction of the wall parapet can be carried out efficiently.

[0014] (6) In (4) above, the step of constructing the outer part of the wall parapet may include the step of removing the inner formwork after the cement-based material has hardened. In this case, the inner formwork can be removed when the cement-based material has hardened and the construction of the outer part of the wall parapet is complete. In order to ensure the integrity of the outer and inner parts of the wall parapet, a retarder may be applied to the surface of the inner formwork when constructing the outer part of the wall parapet, and a roughening treatment may be performed after the cement-based material has hardened and the inner formwork has been removed.

[0015] (7) In any of (4) to (6) above, the construction method for the parapet wall may include a step of placing a separator having an anchor between the reinforcing bars of the parapet wall before the step of constructing the outer part of the parapet wall. The separator may have a pair of anchors located at each end of the separator. One of the pair of anchors may be embedded in the cement-based material in the step of pouring the cement-based material on the inside of the outer formwork in the direction perpendicular to the bridge axis. The step of constructing the inner part of the parapet wall may include a step of installing the inner formwork on the inside of the outer part of the parapet wall in the direction perpendicular to the bridge axis, and a step of pouring the cement-based material between the inner formwork and the outer part of the parapet wall. The other of the pair of anchors may be fixed to the inner formwork. In the step of pouring the cement-based material between the inner formwork and the outer part of the parapet wall, the exposed portion of the separator located between the inner formwork and the outer part of the parapet wall may be embedded in the cement-based material.

[0016] In this case, before the outer part of the parapet is constructed, a separator with anchors is placed between the reinforcing bars that make up the parapet, and one of the pair of anchors is embedded in the cement-based material when the outer part of the parapet is constructed. The other of the pair of anchors is fixed to the inner formwork used when the inner part of the parapet is constructed. Therefore, the placement and fixing of the inner formwork can be made easier. The exposed portion of the separator with anchors between the inner formwork and the outer part of the parapet is embedded in the cement-based material. Therefore, the strength of the parapet can be increased.

[0017] (8) In any of (1) to (7) above, the step of constructing the outer part of the wall parapet may include the steps of installing an inner formwork inward in the direction perpendicular to the bridge axis from the end face of the deck slab facing in the direction perpendicular to the bridge axis, and pouring cement-based material into the end of the inner formwork in the direction perpendicular to the bridge axis. In this case, the inner formwork is installed inward in the direction perpendicular to the bridge axis from the end face of the deck slab, and cement-based material is poured into the end of the inner formwork in the direction perpendicular to the bridge axis. Thus, the outer part of the wall parapet can be constructed efficiently.

[0018] (9) In any of the above steps (3) to (8), in the step of pouring cement-based material into the inner side of the outer formwork perpendicular to the bridge axis, the cement-based material may be sprayed onto the inner side of the outer formwork perpendicular to the bridge axis. In this case, the pouring of the cement-based material can be carried out efficiently by spraying.

[0019] (10) In (8) above, the construction method for the parapet wall may include a step of placing a movable formwork on the end of the inner formwork perpendicular to the bridge axis. In the step of pouring cement-based material on the end of the inner formwork perpendicular to the bridge axis, cement-based material may be poured between the inner formwork and the movable formwork, and after the cement-based material located between the inner formwork and the movable formwork has hardened, the movable formwork may be moved upward, and cement-based material may be poured between the movable formwork that has been moved upward and the inner formwork. In this case, the outer part of the parapet wall can be constructed efficiently by pouring cement-based material while moving the movable formwork. [Effects of the Invention]

[0020] According to the present disclosure, cracking and poor filling of cement-based materials can be prevented.

Brief Description of the Drawings

[0021] [Figure 1] FIG. 1 is a diagram showing the steps of the construction work of a bridge according to an embodiment. [Figure 2] FIGS. 2(a), 2(b) and 2(c) are diagrams showing the steps of the construction method of a wall railing according to an embodiment. [Figure 3] FIGS. 3(a), 3(b) and 3(c) are diagrams showing an example of an inner formwork according to an embodiment. [Figure 4] FIGS. 4(a) and 4(b) are diagrams showing another example of an inner formwork according to an embodiment. [Figure 5] FIGS. 5(a) and 5(b) are diagrams showing an example of the steps of constructing the outer part of a wall railing according to an embodiment. [Figure 6] FIGS. 6(a) and 6(b) are diagrams showing an example of the steps of constructing the outer part of a wall railing according to an embodiment. [Figure 7] FIGS. 7(a) and 7(b) are diagrams showing an example of the steps of constructing the outer part of a wall railing according to an embodiment. [Figure 8] FIG. 8 is a diagram showing the steps of the construction work of a bridge according to an embodiment. [Figure 9] FIGS. 9(a) and 9(b) are diagrams showing an example of the steps of constructing the inner part of a wall railing according to an embodiment. [Figure 10] FIGS. 10(a) and 10(b) are diagrams showing an example of the steps of constructing the inner part of a wall railing according to an embodiment. [Figure 11] FIGS. 11(a) and 11(b) are diagrams showing an example of the steps of constructing the inner part of a wall railing according to an embodiment.

Embodiments for Carrying Out the Invention

[0022] The following describes embodiments of the construction method for the wall parapet according to this disclosure, with reference to the drawings. In the description of the drawings, the same or equivalent elements are denoted by the same reference numerals, and redundant explanations are omitted as appropriate. For the sake of ease of understanding, some parts of the drawings may be simplified or exaggerated, and the dimensional ratios, etc., are not limited to those shown in the drawings.

[0023] Figure 1 shows an example of a bridge 1 and cantilever erection device 10 to which the wall parapet construction method according to this embodiment is applied. As shown in Figure 1, the cantilever erection device 10 is used, for example, when constructing a bridge 1 that forms a road bridge at a construction site A. At site A, in addition to the cantilever erection device 10, construction machinery such as a crane K is also located. The construction of the bridge 1 is carried out while the materials necessary for the construction of the bridge 1 are lifted by the crane K, etc.

[0024] Bridge 1 comprises a bridge girder 2 and a bridge pier 3. The bridge pier 3 has a column head 4 at its upper end. An exemplary cantilever erection device 10 is used for cantilever construction of the bridge girder 2 in bridge 1. The bridge girder 2 is constructed by sequentially cantilevering main girder blocks B along the bridge axis direction D1 from the column head 4 located at the upper end of the bridge pier 3. The main girder blocks B include a deck slab 5. The cantilever erection device 10 includes a mobile work vehicle, the Wagen 11, which is movable on the bridge girder 2.

[0025] The Wagen 11 cantilevers the bridge girder 2 from both ends in the bridge axis direction D1 of the existing blocks of the bridge girder 2 (already constructed main girder blocks B) for each main girder block B. The cantilever erection device 10 has multiple Wagens 11. Each of the multiple Wagens 11 cantilevers outward from each end in the bridge axis direction D1 of the existing blocks of the bridge girder 2.

[0026] The wagon 11 has a truss structure and a wagon body 12 arranged in a parallelogram shape, a load 13 suspended and supported by the wagon body 12, and rails 14 that allow the wagon body 12 to move along the bridge axis direction D1 on the upper surface of the existing blocks of the bridge girder 2. The load 13 is suspended and supported by the wagon body 12 and constitutes the shoring when each main girder block B of the bridge girder 2 is constructed to be cantilevered. The load 13 includes scaffolding and formwork.

[0027] The construction method for the parapet wall according to this embodiment is carried out using the cantilever erection device 10 described above. Below, the method for constructing the parapet wall wall 6 (see Figure 9(b)) will be described. The parapet wall wall 6 is constructed on a deck slab 5 that extends in a direction perpendicular to the bridge axis D2, which is perpendicular to the bridge axis direction D1. The bridge girder 2 of the bridge 1 is composed of multiple deck slabs 5.

[0028] In this construction method, a parapet wall 6 is constructed on top of the bridge girder 2 (deck slab 5). The deck slab 5 extends in the direction of the bridge axis D1 and in the direction perpendicular to the bridge axis D2, and has thickness in the direction D3 that intersects the direction of the bridge axis D1 and the direction perpendicular to the bridge axis D2. A parapet wall 6 is constructed at each end of the deck slab 5 in the direction perpendicular to the bridge axis D2. In the parapet wall construction method according to this embodiment, a portion of the parapet wall 6 is constructed using scaffolding for the wagon 11 (loaded 13) along with the cantilever construction of each main girder block B of the bridge girder 2. The following describes each step of the parapet wall construction method.

[0029] First, the cantilever construction of bridge girder 2 on bridge 1 is carried out (cantilever construction process). Along with the cantilever construction of bridge girder 2, the wagon 11 is installed and construction of the main girder block B of bridge girder 2 begins (main girder block construction process). The construction of the main girder block B is carried out sequentially along the bridge axis direction D1. More specifically, the load 13 of the wagon 11 is placed adjacent to the existing main girder block B, scaffolding is constructed on the load 13, formwork is assembled on the scaffolding, and the main girder block B is constructed.

[0030] As shown in Figure 2(a), construction of the main girder block B is started simultaneously with the construction of the parapet wall 6 on the constructed scaffolding. In the construction of the parapet wall 6, chipping is performed on the upper surface 5c and end surface 5d of the end 5b of the deck slab 5 (main girder block B) in the direction D2 perpendicular to the bridge axis. Then, while the cantilever construction is being carried out, the outer part 6A of the parapet wall is constructed on the end side (left side in Figures 2(a), 2(b), and 2(c)) in the direction D2 perpendicular to the bridge axis of location P where the parapet wall 6 is to be constructed on the upper surface 5c of the deck slab 5 (process of constructing the outer part of the parapet wall).

[0031] Reinforcing bars 6b are constructed at location P, where the parapet wall 6 is planned to be built on the upper surface 5c of the floor slab 5. The reinforcing bars 6b are the reinforcing bars that make up the parapet wall 6. The construction of the reinforcing bars 6b is carried out, for example, by workers standing on scaffolding made of a wagon 11. At this time, multiple reinforcing bars 6b that will form the framework of the parapet wall 6 are placed on the end portion 5b of the floor slab 5.

[0032] Next, an outer formwork 7 is installed extending upward from the end face 5d of the deck slab 5 facing in the direction D2 perpendicular to the bridge axis (outer formwork installation step). At this time, the outer formwork 7 may be installed at a location away from the end face 5d of the deck slab 5 so as to extend upward relative to the end face 5d. The outer formwork 7 is, for example, a standard formwork. An inner formwork 20 is installed inside the outer formwork 7 in the direction D2 perpendicular to the bridge axis (inner formwork installation step). At this time, the outer formwork 7 is positioned on the scaffolding of the wagon 11 so as to extend vertically upward from the end face 5d of the deck slab 5, and the inner formwork 20 is positioned on the opposite side from the outer formwork 7 when viewed from the reinforcing bars 6b.

[0033] The inner formwork 20 is positioned such that, for example, the surface 20b facing the outer formwork 7 is closer to the outer formwork 7 than the center of the bridge axis direction D2 at location P. The inner formwork 20 is positioned between multiple reinforcing bars 6b. In this case, when constructing the outer part 6A of the wall parapet, some of the multiple reinforcing bars 6b are embedded in the cement-based material. From the viewpoint of increasing the strength of the outer part 6A of the wall parapet, it is preferable to position the inner formwork 20 between multiple reinforcing bars 6b. However, the inner formwork 20 may also be positioned between multiple reinforcing bars 6b and the outer formwork 7. In this case, when constructing the outer part 6A of the wall parapet, the multiple reinforcing bars 6b are not embedded in the cement-based material.

[0034] The inner formwork 20 is, for example, an embedded formwork that is embedded in a cement-based material. However, the inner formwork 20 does not have to be an embedded formwork, and the type of inner formwork 20 can be changed as appropriate. For example, cement-based material C is poured into the inner side of the outer formwork 7 in the direction perpendicular to the bridge axis D2 (the right side in Figures 2(a), 2(b), and 2(c)) (the process of pouring cement-based material into the inner side of the outer formwork in the direction perpendicular to the bridge axis).

[0035] In this embodiment, the cement-based material C is concrete or mortar. The cement-based material C may be poured between the outer formwork 7 and the inner formwork 20 (step of pouring cement-based material between the outer formwork and the inner formwork). For example, the inner formwork 20 is removed after the poured cement-based material C has hardened (step of removing the inner formwork). In order to ensure the integrity between the outer part 6A of the wall parapet and the inner part 6B of the wall parapet (see Figure 9(b), etc.), a retarder may be applied to the inner formwork 20 when constructing the outer part 6A of the wall parapet, and a roughening treatment may be performed after the cement-based material has hardened and the inner formwork 20 has been removed. After the above steps are completed, the construction of the outer part 6A of the wall parapet is completed.

[0036] The following describes various examples of the inner formwork 20 and modified methods for constructing the outer part 6A of the wall parapet. As shown in Figures 3(a), 3(b), and 3(c), the inner formwork 20 may be a mesh-like runoff prevention material 21. For example, the mesh-like runoff prevention material 21 is a lath mesh. The mesh-like runoff prevention material 21 may be a blind-shaped lath mesh. For example, the mesh-like runoff prevention material 21 has a plurality of intersecting linear members 21c, with holes 21b formed between the plurality of linear members 21c.

[0037] The mesh-like leak prevention material 21 has a plurality of holes 21b, for example, the plurality of holes 21b are arranged in a staggered pattern. For example, the linear member 21c extends diagonally upward from one side to the other in the thickness direction D4 of the inner formwork 20. In this case, it is possible to make it difficult for the cement-based material C to leak from the linear member 21c. The cement-based material C that leaks from the linear member 21c is removed by cleaning after the pouring of the cement-based material C is completed.

[0038] When the inner formwork 20 is a mesh-like runoff prevention material 21, for example, the mesh-like runoff prevention material 21 is embedded in the cement-based material C while being fixed to multiple reinforcing bars 6b. When the mesh-like runoff prevention material 21 is used, the cement-based material C filled through the holes 21b of the mesh-like runoff prevention material 21 and the inner part 6B of the wall parapet, which will be described later, become one, so there is no need to remove the mesh-like runoff prevention material 21 after the cement-based material C has hardened.

[0039] Figures 4(a) and 4(b) show other examples of the inner formwork 20. As shown in Figures 4(a) and 4(b), the inner formwork 20 may also be an air tube 22. The air tube 22 is inserted between multiple reinforcing bars 6b. For example, after the air tube 22 is inserted between multiple reinforcing bars 6b, air is supplied to the inside of the air tube 22. The supply of air to the inside of the air tube 22 causes the air tube 22 to inflate.

[0040] The air tube 22 has, for example, a bag body 22b made of a non-permeable material and an air intake / exhaust section 22c for bringing air in and out of the bag body 22b. The air intake / exhaust section 22c is provided, for example, at the upper end of the bag body 22b. The bag body 22b inflates when air is supplied to the inside of the bag body 22b from the air intake / exhaust section 22c and deflates when air is released from the air intake / exhaust section 22c.

[0041] For example, before pouring the cement-based material C, multiple air tubes 22 are inserted between multiple reinforcing bars 6b, and air is supplied to the bag-shaped bodies 22b of the multiple air tubes 22 to inflate them, and then the cement-based material C is poured between the multiple air tubes 22 and the outer formwork 7. After the cement-based material C hardens, the air is released from the multiple air tubes 22, and the air-released multiple air tubes 22 are removed from the cement-based material C. Alternatively, instead of multiple air tubes 22, rod-shaped sponge members with a core (e.g., a steel rod) may be inserted between multiple reinforcing bars 6b. Since the sponge members are made of a soft material, they can fill the gaps between the multiple reinforcing bars 6b and can be removed even after the cement-based material C has hardened. When using these sponge members, the work of supplying and releasing air is unnecessary, so work efficiency can be improved.

[0042] As shown in Figures 5(a) and 5(b), the cement-based material C may be poured by spraying. For example, the outer part 6A of the parapet wall may be constructed by spraying the cement-based material C onto the inside of the outer formwork 7 in the direction D2 perpendicular to the bridge axis (step of spraying the cement-based material). In this case, the thickness of the outer part 6A of the parapet wall can be adjusted by adjusting the spraying thickness of the cement-based material C. For example, by spraying the cement-based material C onto the outer formwork 7, some of the cement-based material C may be embedded in the cement-based material C of the multiple reinforcing bars 6b.

[0043] As shown in Figures 6(a) and 6(b), instead of the outer formwork 7, an inner formwork 20 may be installed in the direction of the bridge axis perpendicular D2, inside the end face 5d of the deck slab 5 that faces the bridge axis perpendicular D2 (step of installing the inner formwork in the direction of the bridge axis perpendicular). Then, cement-based material C may be poured into the end of the inner formwork 20 in the direction of the bridge axis perpendicular D2 to construct the outer part 6A of the wall parapet (step of pouring cement-based material into the end of the inner formwork in the direction of the bridge axis perpendicular).

[0044] In Figures 6(a) and 6(b), for example, the inner formwork 20 is a mesh-like runoff prevention material 21 (for example, lath mesh). The cement-based material C is poured into the inner formwork 20 from the end side in the direction D2 perpendicular to the bridge axis, for example, by spraying the cement-based material C. However, instead of spraying the cement-based material C, the outer part 6A of the wall parapet may be constructed by pouring the cement-based material C using an immediate demolding method.

[0045] The cement-based material C for the immediate demolding method may be a cement composition comprising water, cement, fine aggregate, coarse aggregate, and damping agent. The cement-based material C may further contain clay minerals. The cement is, for example, Portland cement. The cement may be a mixture in which a portion of the Portland cement is replaced with blast furnace slag. In this case, CO2 emissions during the cement production stage can be reduced.

[0046] The water-cement ratio of cement-based material C is, for example, 30% or more and 80% or less. For example, the coarse aggregate content is 400 L / m³. 3 If the above conditions are met, the water-cement ratio is more preferably 40% or more and 55% or less. The fine aggregate of cement-based material C is, for example, aggregate as defined in JIS A 5308, JIS A 5005, JIS A 5002, and JIS A 5011, and examples of fine aggregate include crushed sand, sand, river sand, sea sand, crushed lime sand, recycled aggregate, lightweight aggregate, or heavy aggregate. The amount of fine aggregate in the cement composition is, for example, 30% or more and 60% or less by volume relative to the mortar consisting of water, cement material and fine aggregate.

[0047] The coarse aggregate of cement-based material C is, for example, the aggregate defined in JIS A 5308, JIS A 5005, JIS A 5002, and JIS A 5011, and is distinguished from the fine aggregate by particle size. For example, fine aggregate may be defined as aggregate that passes entirely through a 10 mm sieve and 85% or more by weight through a 5 mm sieve, while coarse aggregate may be defined as aggregate that remains on the 5 mm sieve for 85% or more by weight. The coarse aggregate content in the cement composition is, for example, 300 L / m³. 3 And above 550 L / m 3 The following applies:

[0048] The clay mineral in cement-based material C is, for example, a formite clay mineral. Formite clay minerals are, for example, sepiolite. Sepiolite has dry-solidifying properties (it hardens when mixed with water and dried) and also has excellent water absorption and retention properties due to the presence of fine, continuous voids inside. While kaolin and bentonite are called layered clays, sepiolite is classified as a chain clay. In the cement composition of cement-based material C, the clay mineral content is, for example, 3% by mass or more and 10% by mass or less relative to water.

[0049] Furthermore, the sepiolite content in molded products of precast cement-based materials after hardening can be determined by adding 0.5 parts magnesium oxide to 4.5 parts of the hardened material, thoroughly mixing it in an agate mortar, and then performing powder X-ray diffraction measurement. The measurement results can then be analyzed, for example, using quantitative software "SIROQUANT" from Sietronics.

[0050] The cement composition of cement-based material C may further contain other admixtures. Other admixtures include, for example, γ-C2S, coal ash, fly ash, or limestone powder. The composition of cement-based material C may contain various admixtures. These admixtures include, for example, water-reducing agents, AE water-reducing agents, high-performance water-reducing agents, high-performance AE water-reducing agents, AE agents, or fluidizers. The amount of admixture is, for example, 0.001 parts by mass or more and 3 parts by mass or less per 100 parts by mass of cement component.

[0051] The cement-based material C for the immediate demolding method may, for example, be mortar mixed with sepiolite or rheosil. In this mortar, the cement content is relatively high. Rheosil is an ultrafine powder. As an example, cement-based material C may contain 4 kg / m³ of sepiolite (clay mineral). 3 It is added, and the leuroseal content is 4 kg / m². 3 It may be added. If an admixture is added to cement-based material C, it can impart self-supporting properties to cement-based material C.

[0052] Various types of cement-based material C can be used as the cement-based material C that is poured into the outer formwork 7 and other standard formwork. The cement-based material C used for spraying is preferably composed of a material that becomes self-supporting after spraying. Furthermore, the cement-based material C may be mortar with a quick-setting agent added. In this case, the cement-based material C can harden quickly, allowing for rapid construction. Also, the cement-based material C may contain mortar with high thixotropy. In this case, the cement-based material C will flow when an external force is applied and become self-supporting when the external force is removed. As described above, various materials can be used for the cement-based material C.

[0053] A movable formwork 24 may be placed on the end of the inner formwork 20 in the direction D2 perpendicular to the bridge axis (step of placing the movable formwork). The height of the movable formwork 24 (length in direction D3) is less than the height of the inner formwork 20. Cement-based material C is poured between the inner formwork 20 and the movable formwork 24, and after the cement-based material C located between the inner formwork 20 and the movable formwork 24 hardens, the movable formwork 24 is moved upward, and cement-based material C is poured between the moved movable formwork 24 and the inner formwork 20. The upward movement of the movable formwork 24 and the pouring of cement-based material C are repeated, and after the height of the cement-based material C reaches a predetermined height, the construction of the outer part 6A of the wall parapet is completed.

[0054] Figures 7(a) and 7(b) show further variations of the construction method for the outer part 6A of the wall parapet. As shown in Figures 7(a) and 7(b), the outer part 6A of the wall parapet may be constructed by installing an air tube 22 inward in the direction D2 perpendicular to the bridge axis from the end face 5d of the deck slab 5, and then spraying a cement-based material C onto the air tube 22 from the end side in the direction D2 perpendicular to the bridge axis while the air tube 22 is inflated.

[0055] Alternatively, a movable formwork 24 may be placed on the end of the inflated air tube 22 perpendicular to the bridge axis D2, and cement-based material C may be poured between the air tube 22 and the movable formwork 24. Then, as in the case of Figure 6(b), after the cement-based material C located between the air tube 22 and the movable formwork 24 has hardened, the movable formwork 24 is moved upward, and cement-based material C is poured between the moved movable formwork 24 and the air tube 22. Once the height of the cement-based material C reaches a predetermined height and the cement-based material C that has reached the predetermined height has hardened, the air is released from the air tube 22 and the deflated air tube 22 is removed. After these steps, the construction of the outer part 6A of the wall parapet is completed. As the inner formwork 20 in Figures 7(a) and 7(b), a core-reinforced sponge rod may be used as a substitute for the air tube 22.

[0056] The construction of the outer part 6A of the wall parapet described above is carried out during the cantilever construction of the bridge girder 2. Figure 8 is a schematic diagram showing the bridge 1 after the cantilever construction is completed. As shown in Figure 8, after the cantilever construction is completed, the bridge girder 2 (main girder block B) that cantilevers from one of the multiple bridge piers 3 is connected to the bridge girder 2 that cantilevers from the other, and the connection of the multiple main girder blocks B lined up along the bridge axis direction D1 is completed.

[0057] As shown in Figures 9(a) and 9(b), after the cantilever construction is completed, the inner part 6B of the parapet wall is constructed in all locations except the outer part 6A of the parapet wall at location P where the parapet wall 6 is to be constructed (process of constructing the inner part of the parapet wall). The inner part 6B of the parapet wall is thicker than the outer part 6A of the parapet wall. For example, at least a portion of the inner part 6B is thicker than the outer part 6A of the parapet wall. The length D2 of the inner part 6B in the direction perpendicular to the bridge axis is longer than the length D2 of the outer part 6A of the parapet wall. For example, the thickness of the outer part 6A of the parapet wall (length D2 in the direction perpendicular to the bridge axis) is at least 1 / 4 and at least 1 / 3 of the thickness of the parapet wall 6 (the entire parapet wall 6).

[0058] For example, an inner formwork 25 is installed at the inner end of location P, perpendicular to the bridge axis in the direction D2, where the parapet wall 6 is to be constructed, and a backing plate W is installed on the surface of the outer part of the parapet wall 6A facing the end perpendicular to the bridge axis in the direction D2. Then, the inner part of the parapet wall 6B is constructed by pouring cement-based material C between the inner formwork 25 and the backing plate W.

[0059] The cement-based material C is poured onto the top surface 6j of the outer part 6A of the wall parapet. As a result, the inner part 6B of the wall parapet is formed to cover the top surface 6j of the outer part 6A of the wall parapet, so that the height of the top surface of the wall parapet 6 can be adjusted. For example, the thickness of the cement-based material C poured onto the top surface 6j may be measured by a scanner device. As an example, the scanner device may measure the thickness of the cement-based material C by irradiating light onto the cement-based material C poured onto the top surface 6j and receiving the reflected light reflected from the surface of the cement-based material C. In this case, the thickness of the cement-based material C can be controlled with high precision.

[0060] For example, to adjust the height of the wall railing 6, a marker indicating the target height of the wall railing 6 may be set on the top surface 6j of the outer part 6A of the wall railing. The marker may be, for example, a rod-shaped member (a bolt, for example) that protrudes from the top surface 6j to the target height. In this case, the height of the wall railing 6 can be set to the target height by pouring cement-based material C into the top surface 6j to the extent that the rod-shaped member is embedded. The height adjustment of the wall railing 6 may also be performed by a plasterer.

[0061] Figures 10(a) and 10(b) show a method for constructing the outer part 6A and inner part 6B of the wall parapet according to a modified example. As shown in Figures 10(a) and 10(b), before constructing the outer part 6A of the wall parapet, a separator 26 having a pair of anchors 26c and 26d may be placed between the reinforcing bars 6b of the wall parapet 6 (step of placing the separator). The anchors 26c and 26d may be, for example, anchoring bodies.

[0062] The separator 26 has a rod-shaped portion 26b, an anchor 26c located at one end of the rod-shaped portion 26b, and an anchor 26d located at the other end of the rod-shaped portion 26b. The separator 26 is constructed, for example, together with the reinforcing bar 6b. As an example, the separator 26 is attached to the reinforcing bar 6b.

[0063] The separators 26 are arranged to extend along the direction D2 perpendicular to the bridge axis. For example, multiple separators 26 are arranged together with the reinforcing bars 6b. In this case, the multiple separators 26 are arranged to be aligned along the direction D3. The multiple separators 26 may also be arranged to be aligned along the bridge axis direction D1.

[0064] For example, when constructing the outer part 6A of the wall parapet, the end portion of the separator 26 in the direction D2 perpendicular to the bridge axis is embedded in the cement-based material C. The anchor 26d of the separator 26 is embedded in the cement-based material C when the cement-based material C is poured into the inner side of the outer formwork 7 in the direction D2 perpendicular to the bridge axis.

[0065] After the outer part 6A of the wall parapet is constructed, a portion of the separator 26 protrudes inward from the outer part 6A of the wall parapet along the direction D2 perpendicular to the bridge axis. Then, when constructing the inner part 6B of the wall parapet, the inner formwork 25 is placed inside the outer part 6A of the wall parapet in the direction D2 perpendicular to the bridge axis (the process of placing the inner formwork).

[0066] Anchors 26c of separators 26 protruding from the outer part 6A of the wall parapet are fixed to the inner formwork 25. At this time, multiple anchors 26c aligned along direction D3 are fixed to the inner formwork 25. Thus, the inner formwork 25 can be stably positioned. After positioning the inner formwork 25, cement-based material C is poured between the inner formwork 25 and the outer part 6A of the wall parapet (step of pouring cement-based material between the inner formwork and the outer part of the wall parapet).

[0067] At this time, the exposed portion of the separator 26 located between the inner formwork 25 and the outer part 6A of the wall parapet is embedded in the cement-based material C. After the cement-based material C hardens, the anchors 26c are installed and the inner formwork 25 is removed from the cement-based material C. Then, the construction of the inner part 6B of the wall parapet is completed, and the series of steps in the construction method of the wall parapet 6 is completed.

[0068] Figures 11(a) and 11(b) show further variations of the method for constructing the inner part 6B of the parapet wall. As shown in Figure 11(a), the inner part 6B of the parapet wall may be constructed by spraying a cement-based material C. For example, the inner part 6B of the parapet wall is constructed by spraying the cement-based material C on the inside of the outer part 6A of the parapet wall in the direction D2 perpendicular to the bridge axis. In this case, the thickness of the inner part 6B of the parapet wall can be adjusted by adjusting the spraying thickness of the cement-based material C.

[0069] As shown in Figure 11(b), a movable formwork 24 may be placed inside the outer part 6A of the wall parapet in the direction D2 perpendicular to the bridge axis (step of placing the movable formwork). Then, cement-based material C may be poured between the outer part 6A of the wall parapet and the movable formwork 24, and after the cement-based material C located between the outer part 6A of the wall parapet and the movable formwork 24 has hardened, the movable formwork 24 may be moved upward, and cement-based material C may be poured between the moved movable formwork 24 and the outer part 6A of the wall parapet. The upward movement of the movable formwork 24 and the pouring of cement-based material C are repeated, and after the height of the cement-based material C reaches a predetermined height, the construction of the inner part 6B of the wall parapet is completed.

[0070] Next, the effects of the construction method for the parapet wall according to this embodiment will be explained. In the construction method for the parapet wall according to this embodiment, the bridge girder 2 of the bridge 1 is cantilevered, and a parapet wall 6 is constructed at each of the ends of the multiple deck slabs 5 constituting the bridge girder 2 of the bridge 1 in the direction D2 perpendicular to the bridge axis. As shown in Figure 2, while the cantilever construction is being carried out, the outer part 6A of the parapet wall is constructed on the end side in the direction D2 perpendicular to the bridge axis of the location P on the deck slab 5 where the parapet wall wall 6 is to be constructed. Since the outer part 6A of the parapet wall wall, which is part of the parapet wall wall 6, is constructed during the cantilever construction, a part of the parapet wall wall 6 can be constructed in advance during the cantilever construction.

[0071] As shown in Figure 9, after the cantilever construction is completed, the inner part 6B of the wall parapet is constructed in areas other than the outer part 6A of the wall parapet at location P where the wall parapet 6 is planned to be constructed. Therefore, the occurrence of cracks that occur when the cement-based material C constituting the inner part 6B of the wall parapet hardens can be mitigated. Furthermore, even when using cement-based material C containing large aggregates or cement-based material C with low fluidity, poor filling of the cement-based material C during the construction of the inner part 6B of the wall parapet can be prevented.

[0072] In the process of constructing the inner part 6B of the wall parapet, the inner part 6B may be constructed to be thicker than the outer part 6A of the wall parapet. In this case, cracks that occur when the cement-based material constituting the inner part 6B of the wall parapet hardens can be made less likely to occur. Furthermore, because the inner part 6B of the wall parapet, which is constructed later, is thicker than the outer part 6A of the wall parapet, compaction work can be performed by vibrator excitation, so even when using cement-based material C containing large aggregates or cement-based material C with low fluidity, poor filling of the cement-based material C during the construction of the inner part 6B of the wall parapet can be more reliably prevented.

[0073] As shown in Figure 2, the process of constructing the outer part 6A of the wall parapet may include the steps of installing an outer formwork 7 extending upward from the end face 5d of the deck slab 5 facing in the direction D2 perpendicular to the bridge axis, and pouring cement-based material C into the inner side of the outer formwork 7 in the direction D2 perpendicular to the bridge axis. In this case, the outer formwork 7 extending upward from the end face 5d of the deck slab 5 facing in the direction D2 perpendicular to the bridge axis is installed, and cement-based material C is poured into the inner side of the outer formwork 7 in the direction D2 perpendicular to the bridge axis. Thus, the outer part 6A of the wall parapet can be constructed efficiently.

[0074] As mentioned above, the process of constructing the outer part 6A of the wall parapet may include the step of installing the inner formwork 20 inside the outer formwork 7 in the direction D2 perpendicular to the bridge axis, and in the step of pouring the cement-based material C, the cement-based material C may be poured between the outer formwork 7 and the inner formwork 20. In this case, the inner formwork 20 is installed inside the outer formwork 7 in the direction D2 perpendicular to the bridge axis, and the cement-based material C is poured between the outer formwork 7 and the inner formwork 20. Therefore, the construction of the outer part 6A of the wall parapet can be carried out more efficiently.

[0075] As mentioned above, the inner formwork 20 may be embedded formwork. In this case, there is no need to remove the inner formwork 20 after the construction of the outer part 6A of the wall parapet, so the construction of the wall parapet 6 can be carried out efficiently. If the inner formwork 20 is embedded formwork, the inner formwork 20 may be made of mesh reinforcement.

[0076] As mentioned above, the process of constructing the outer part 6A of the wall parapet may include the step of removing the inner formwork 20 after the cement-based material C has hardened. In this case, the inner formwork 20 can be removed when the cement-based material C has hardened and the construction of the outer part 6A of the wall parapet is complete. In order to ensure the integrity of the outer part 6A of the wall parapet and the inner part 6B of the wall parapet, a retarder may be applied to the inner formwork surface when constructing the outer part 6A of the wall parapet, and a roughening treatment may be performed after the cement-based material has hardened and the inner formwork has been removed.

[0077] As shown in Figure 10, the construction method for the parapet wall 6 may include a step of placing a separator 26 having anchors 26c and 26d between the reinforcing bars 6b of the parapet wall 6 before the step of constructing the outer part 6A of the parapet wall. The separator 26 may have anchors 26c and 26d located at each end of the separator 26. One of the anchors 26c and 26d, anchor 26d, may be embedded in the cement-based material C in the step of pouring the cement-based material C inside the outer formwork 7 in the direction D2 perpendicular to the bridge axis. The step of constructing the inner part 6B of the parapet wall may include a step of installing an inner formwork 25 inside the outer part 6A of the parapet wall in the direction D2 perpendicular to the bridge axis, and a step of pouring the cement-based material C between the inner formwork 25 and the outer part 6A of the parapet wall. The other of the anchors 26c and 26d, anchor 26c, may be fixed to the inner formwork 25. In the step of pouring cement-based material C between the inner formwork 25 and the outer part 6A of the wall parapet, the exposed portion of the separator 26 located between the inner formwork 25 and the outer part 6A of the wall parapet may be embedded in the cement-based material C.

[0078] In this case, before the outer part 6A of the wall parapet is constructed, separators 26 with anchors 26c and 26d are placed between the reinforcing bars 6b that make up the wall parapet 6, and anchors 26d are embedded in the cement-based material C when the outer part 6A of the wall parapet is constructed. Anchors 26c are fixed to the inner formwork 25 used when the inner part 6B of the wall parapet is constructed. Therefore, the placement and fixing of the inner formwork 25 can be easily performed. The exposed portion of the separator 26 with anchors 26c and 26d between the inner formwork 25 and the outer part 6A of the wall parapet is embedded in the cement-based material C. Therefore, the strength of the wall parapet 6 can be increased.

[0079] As shown in Figures 6(a) and 6(b), the process of constructing the outer part 6A of the wall parapet may include the steps of installing the inner formwork 20 inside the end face 5d of the deck slab 5 that faces in the direction D2 perpendicular to the bridge axis, and pouring cement-based material C into the end of the inner formwork 20 that faces in the direction D2 perpendicular to the bridge axis. In this case, the inner formwork 20 is installed inside the end face 5d of the deck slab 5 in the direction D2 perpendicular to the bridge axis, and cement-based material C is poured into the end of the inner formwork 20 that faces in the direction D2 perpendicular to the bridge axis. Thus, the outer part 6A of the wall parapet can be constructed efficiently.

[0080] As shown in Figures 5(a) and 5(b), in the process of pouring cement-based material C into the inner side of the outer formwork 7 in the direction D2 perpendicular to the bridge axis, the cement-based material C may also be sprayed onto the inner side of the outer formwork 7 in the direction D2 perpendicular to the bridge axis. In this case, the pouring of cement-based material C can be carried out efficiently by spraying.

[0081] As shown in Figure 6(b), the construction method for the wall parapet 6 may include a step of positioning a movable formwork 24 on the end side of the inner formwork 20 in the direction D2 perpendicular to the bridge axis. In the step of pouring cement-based material C on the end side of the inner formwork 20 in the direction D2 perpendicular to the bridge axis, the cement-based material C may be poured between the inner formwork 20 and the movable formwork 24, and after the cement-based material C located between the inner formwork 20 and the movable formwork 24 has hardened, the movable formwork 24 may be moved upward, and the cement-based material C may be poured between the moved movable formwork 24 and the inner formwork 20. In this case, by pouring the cement-based material C while moving the movable formwork 24, the outer part 6A of the wall parapet can be constructed efficiently.

[0082] The embodiments of the wall railing construction method according to this disclosure have been described above. However, the wall railing construction method according to this disclosure is not limited to the embodiments described above and may be further modified within the scope of the gist described in the claims. That is, the content and sequence of steps in the wall railing construction method, as well as the shape, size, type, number and arrangement of the devices and materials used in the construction method, can be appropriately changed within the scope of the gist described above.

[0083] For example, in the embodiment described above, an example was described in which the inner part 6B of the wall parapet is thicker than the outer part 6A of the wall parapet. However, the thickness of the inner part of the wall parapet may be less than or equal to the thickness of the outer part of the wall parapet. For example, if the inner formwork includes an air tube or sponge formwork, it is possible to make the thickness of the inner part of the wall parapet less than or equal to the thickness of the outer part of the wall parapet.

[0084] In the embodiments described above, an example was given in which the inner formwork 20 is a mesh-like spillage prevention material 21 or an air tube 22. However, the inner formwork may be something other than the mesh-like spillage prevention material 21 or the air tube 22. For example, the inner formwork may be a sponge formwork that holds the concrete in place, as described above. Thus, the type of inner formwork can be changed as appropriate. The same applies to the outer formwork 7 and the inner formwork 25.

[0085] For example, the type of cement-based material C mentioned above can be further modified. Cement-based material C may be a high-performance material whose composition is adjusted to suit the required properties. In this case, the strength and durability of cement-based material C can be increased, thereby improving the quality of the surface layer of the wall railing 6. The high-performance materials mentioned above include, for example, cement-based material C containing amorphous spherical fine particles of SiO2 (as an example, silica fume®), cement-based material C containing resin cement, or cement-based material C containing a setting retarder.

[0086] The cement-based material C may be composed of commercially available materials. The cement-based material C may be a material that is mixed at a plant. Furthermore, the cement-based material C may have admixtures added on-site. In this case, labor can be saved while keeping the cost of the cement-based material C down. In addition, the cement-based material C may be composed of mortar to which hollow microspheres have been added.

[0087] The hollow microspheres described above are made of an alkali-resistant resin. The hollow microspheres can be mixed together with an admixture. The hollow microspheres may also be contained in a water-soluble sheet, or they may be fed into an agitator vehicle together with the water-soluble sheet. When the cement-based material C is composed of mortar to which hollow microspheres have been added, the durability and freeze-thaw resistance of the wall railing 6 can be improved. [Explanation of Symbols]

[0088] 1...Bridge, 2...Bridge girder, 3...Bridge pier, 4...Column head, 5...Deck slab, 5b...End, 5c...Top surface, 5d...End face, 6...Wall parapet, 6A...Outer part of wall parapet, 6b...Reinforcement, 6B...Inner part of wall parapet, 6j...Top surface, 7...Outer formwork, 10...Cantilever erection device, 11...Van, 12...Van body, 13...Load, 14...Rail, 20...Inner formwork, 20b...Surface, 21...Mesh-like runoff prevention material, 21b ...hole, 21c...linear member, 22...air tube, 22b...bag body, 22c...air supply / exhaust section, 24...movable formwork, 25...inner formwork, 26...separator, 26b...rod-shaped part, 26c,26d...anchor, A...site, B...main girder block, C...cement-based material, D1...bridge axis direction, D2...direction perpendicular to the bridge axis, D3...direction, D4...thickness direction, K...crane, P...location, W...backing plate.

Claims

1. A method for constructing a parapet wall, comprising constructing a parapet wall at each of the ends of multiple deck slabs constituting the bridge girder of a bridge in the direction perpendicular to the bridge axis, The process of constructing the cantilevered bridge girders of the aforementioned bridge, The process of constructing the outer portion of the wall parapet located at the end of the area on the upper surface of the deck slab where the wall parapet is to be constructed, in the direction perpendicular to the bridge axis, while the aforementioned cantilever construction is being carried out, After the aforementioned extension construction is completed, the process involves constructing the inner part of the wall railing in a location other than the outer part of the wall railing in the area where the wall railing is to be constructed, Equipped with, Construction method for wall railings.

2. In the process of constructing the inner part of the wall parapet, the inner part of the wall parapet is constructed to be thicker than the outer part of the wall parapet. A method for constructing a wall railing according to claim 1.

3. The process of constructing the outer portion of the wall parapet includes the steps of installing an outer formwork extending upward from the end face of the deck slab facing perpendicular to the bridge axis, and pouring cement-based material into the inner side of the outer formwork perpendicular to the bridge axis. A method for constructing a wall railing according to claim 1.

4. The step of constructing the outer part of the wall parapet includes the step of installing an inner formwork inside the outer formwork in the direction perpendicular to the bridge axis, In the process of pouring the cement-based material, the cement-based material is poured between the outer formwork and the inner formwork. A method for constructing a wall railing according to claim 3.

5. The aforementioned internal formwork is an embedded formwork. The method for constructing a wall railing according to claim 4.

6. The process of constructing the outer portion of the wall railing includes the step of removing the inner formwork after the cement-based material has hardened. The method for constructing a wall railing according to claim 4.

7. Prior to the step of constructing the outer portion of the wall railing, the process includes placing separators having anchors between the reinforcing bars of the wall railing. The separator has a pair of anchors located at each end of the separator, One of the pair of anchors is embedded in the cement-based material during the process of pouring the cement-based material into the inner side of the outer formwork in the direction perpendicular to the bridge axis. The process of constructing the inner portion of the wall parapet includes the steps of installing an inner formwork on the inner side of the outer portion of the wall parapet in the direction perpendicular to the bridge axis, and pouring cement-based material between the inner formwork and the outer portion of the wall parapet. The other of the pair of anchors is fixed to the inner formwork, In the step of pouring cement-based material between the inner formwork and the outer part of the wall railing, the exposed portion of the separator located between the inner formwork and the outer part of the wall railing is embedded in the cement-based material. The method for constructing a wall railing according to claim 4.

8. The process of constructing the outer part of the wall railing is as follows: A step of installing an inner formwork in the direction perpendicular to the bridge axis, relative to the end face of the deck slab that faces in the direction perpendicular to the bridge axis, The process includes pouring cement-based material into the end portion of the inner formwork perpendicular to the bridge axis, A method for constructing a wall railing according to claim 1.

9. In the step of pouring cement-based material into the inner side of the outer formwork in the direction perpendicular to the bridge axis, the cement-based material is sprayed onto the inner side of the outer formwork in the direction perpendicular to the bridge axis. A method for constructing a wall railing according to claim 3.

10. The process includes arranging a movable formwork on the end side of the inner formwork in the direction perpendicular to the bridge axis, In the step of pouring cement-based material into the inner formwork at the end perpendicular to the bridge axis, cement-based material is poured between the inner formwork and the movable formwork, and after the cement-based material located between the inner formwork and the movable formwork has hardened, the movable formwork is moved upward, and cement-based material is poured between the moved movable formwork and the inner formwork. The method for constructing a wall railing according to claim 8.

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