Embedded formwork unit and construction method of wall railing

Abstract

To provide a buried form unit for constructing a wall balustrade and a construction method of the wall balustrade capable of extremely efficiently constructing the wall balustrade as compared with a conventional method and greatly shortening a construction period.SOLUTION: A buried form unit 1 is constituted of an inside buried form 2 formed of a plurality of upper cement plates 21 and lower cement plates 22, an outside buried form 3 formed of a plurality of outside cement plates 31, a separator 5 for connecting the upper cement plates 21 and the outside cement plates 31, and an internal reinforcement 6. The upper cement plate 21 is connected and fixed in a state where the right and left side edges are in contact with each other, the lower cement plate 22 is connected to the upper cement plate 21 via a hinge and is configured to be rotatable, the outside cement plates 31 is connected and fixed in a state where the right and left side edges are in contact with each other, and the internal reinforcement 6 is formed of a main direction reinforcement 61 and a longitudinal direction reinforcement 62.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an embedded formwork unit that can be used when forming a high wall railing on the floor slab of a bridge (road bridge, highway viaduct, railway bridge, etc.), and a construction method of a high wall railing using this embedded formwork unit.

Background Art

[0002] Conventionally, the high wall railings of bridges such as road bridges and highway viaducts have been formed by in-situ concrete. Generally, first, steel bars are assembled at the covering part of the floor slab (the side edge part of the floor slab, the position that becomes the foundation of the high wall railing), and then formwork (usually wooden formwork) is assembled so as to surround them, and concrete is placed in the formwork. In the case of this method, among the required processes (steel bar assembly, formwork assembly, concrete placement, curing, and formwork removal), any process cannot be executed simultaneously in parallel with other processes, so it is necessary to execute each process one by one in order, and a long construction period is required.

[0003] In addition, since each of the above processes is executed by specialized workers (formwork workers, steel bar workers, etc.), it is necessary to dispatch an appropriate number of formwork workers, steel bar workers, etc. to the site at an appropriate timing in consideration of the schedule and progress of each process.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in recent years, due to the shortage of skilled formwork workers and the like, it is often difficult to secure sufficient personnel according to the schedule, which often hinders process management and causes delays in the construction period. There are also problems in ensuring the stability and safety of quality.

[0006] Furthermore, the practical application of a method that can be constructed more efficiently with a shorter construction period than the conventional construction method of the wall railing described above is desired. In addition, when the used wooden formwork is discarded and incinerated, a large amount of carbon dioxide will be emitted. If a construction method of a wall railing that does not use a wooden formwork can be put into practical use, it can contribute to the reduction of carbon dioxide emissions.

[0007] The present invention aims to solve such problems in the prior art, and provides an embedded formwork unit for constructing a wall railing that can be constructed extremely efficiently compared with the conventional method and enables a significant shortening of the construction period, and a construction method of a wall railing.

Means for Solving the Problems

[0008] The embedded formwork unit according to the present invention is composed of an inner embedded formwork formed by a plurality of upper cement plates and lower cement plates, an outer embedded formwork formed by a plurality of outer cement plates, a separator that connects the upper cement plate and the outer cement plate facing each other at a predetermined interval, and internal steel bars. The upper cement plates are arranged in parallel along the longitudinal direction of the embedded formwork unit and are connected and fixed in a state where the left and right side edges are in contact with each other. The lower cement plates are connected to the upper cement plates via hinges and are configured to be rotatable. The outer cement plates are respectively arranged in parallel along the longitudinal direction of the embedded formwork unit and are respectively connected and fixed in a state where the left and right side edges are in contact with each other. The internal steel bars extend in the vertical direction and are formed by main direction steel bars arranged at a certain interval in the longitudinal direction of the embedded formwork unit and longitudinal direction steel bars extending in the longitudinal direction of the embedded formwork unit and bundled with the main direction steel bars, and are arranged and fixed in the space between the inner embedded formwork and the outer embedded formwork.

[0009] In this embedded formwork unit, it is preferable that the lower cement board is connected to the upper cement board in a state where the upper edge portion contacts or is close to the lower edge portion of the upper cement board on the lower side of the upper cement board. Further, it is preferable that the upper cement board and the outer cement board facing each other with a predetermined interval are connected by separators arranged at two positions in the vertical direction.

[0010] Also, it is preferable that the internal reinforcing bars are bound and fixed to the separators. Furthermore, it has an upper formwork composed of an inner upper formwork and an outer upper formwork. The inner upper formwork is fixed so as to be in contact with the upper parts of the upper cement boards in a parallel state in a direction along the longitudinal direction of the embedded formwork unit, and the outer upper formwork is fixed so as to be in contact with the upper parts of the outer cement boards in a parallel state in a direction along the longitudinal direction of the embedded formwork unit.

[0011] Also, it is preferable that the inner upper formwork and the outer upper formwork are connected by a connecting suspension fitting. Furthermore, it is preferable that ledger boards with adjustable height positions are respectively attached to the back surfaces of the inner upper formwork and the outer upper formwork.

[0012] The construction method of the wall railing according to the present invention is to place the above-described embedded formwork unit on the covering part of the bridge deck slab where the covering part reinforcing bars have been constructed in advance, fix the outer cement board to the covering part, rotate the lower cement board, bind the internal reinforcing bars of the embedded formwork unit and the covering part reinforcing bars in a state where access to the inside of the embedded formwork unit is possible, fix the lower cement board to the covering part after releasing the rotating state, place concrete inside the embedded formwork unit, and integrate the inner embedded formwork and the outer embedded formwork with the placed concrete to form a wall railing.

Effects of the Invention

[0013] The embedded formwork unit according to the present invention can be manufactured at any time in a work yard near the construction site, a factory, or the like. In particular, by manufacturing in a well-equipped factory, high quality and high productivity can be expected. And according to the construction method of the wall railing of the present invention, the required number of pre-manufactured embedded formwork units are transported to the construction site and installed, so that the wall railing can be formed extremely efficiently on the bridge deck slab. Specifically, processes such as steel bar assembly, formwork assembly, and formwork removal can be omitted (or greatly simplified). As a result, compared with the prior art, the construction period can be significantly shortened.

[0014] In addition, the number and types of workers dispatched to the construction site can be reduced, and the restraint time can also be shortened. Therefore, it can preferably cope with problems in process management caused by the shortage of skilled workers and problems such as construction period delays, and ensure the quality stability and safety. Furthermore, since the high-altitude work time can be reduced, the risk of occurrence of falling disasters and the like can be reduced, and the effect of improving the safety during construction can be expected. Also, since the wall railing can be constructed without using wooden formwork, the amount of waste and incineration of used wooden formwork (industrial waste) can be reduced, and it can contribute to the reduction of carbon dioxide emissions.

Brief Description of the Drawings

[0015]

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

[0016] The present invention can be implemented as an "embedded formwork unit" used when forming a wall railing on the floor slab of a bridge (road bridge, viaduct of a highway, railway bridge, etc.) (first embodiment), and can also be implemented as a "method for constructing a wall railing" using this embedded formwork unit (second embodiment). Hereinafter, embodiments of the present invention will be described respectively with reference to the accompanying drawings.

[0017] (First Embodiment: Embedded Formwork Unit) FIG. 1 is a perspective view of an embedded formwork unit 1 according to a first embodiment of the present invention and a partially enlarged view of internal reinforcing bars 6 arranged inside the embedded formwork unit 1, and FIG. 2 is a vertical sectional view of the embedded formwork unit 1 shown in FIG. 1. As shown in these figures, this embedded formwork unit 1 basically consists of an inner embedded formwork 2, an outer embedded formwork 3, an upper formwork 4, a separator 5, and internal reinforcing bars 6.

[0018] The inner embedded formwork 2 is formed by eight upper cement boards 21 and the same number of lower cement boards 22. These upper cement boards 21 and lower cement boards 22 are plate materials mainly made of cement, and more specifically, are formed by putting raw materials (cement, silica powder, water, wollastonite, methyl cellulose, and polypropylene reinforcing fibers) into a vacuum extrusion molding machine (extruded cement boards).

[0019] The upper cement plates 21 each have the same shape and dimensions (width: 500 mm), are arranged in parallel along the longitudinal direction of the embedded formwork unit 1, and are connected and fixed by the upper formwork 4 and the separator 5 with their left and right side edges in contact with each other. The lower cement plates 22 each have the same shape and dimensions, and have the same width dimension (500 mm) as the upper cement plates 21. They have a one-to-one correspondence with the upper cement plates 21, and at the lower side of the corresponding upper cement plates 21, their upper edges are connected to the upper cement plates 21 via hinges 23 in a state of being in contact (or close proximity) with the lower edges of the upper cement plates 21. As shown in FIG. 2, they are configured to be rotatable about the axis of the hinge 23 from the position indicated by the solid line to the position indicated by the dashed line.

[0020] In addition, in the present embodiment, since the hinges 23 are attached to the upper cement plates 21 and the lower cement plates 22 with their axes horizontal, the lower cement plates 22 are configured to be rotatable about the horizontal axis, but may also be configured to rotate about the vertical axis or an inclined axis.

[0021] The outer embedded formwork 3 is formed by eight outer cement plates 31 each having the same shape and dimensions (width: 500 mm). These outer cement plates 31 are arranged in parallel along the longitudinal direction of the embedded formwork unit 1, and are connected and fixed by the upper formwork 4 and the separator 5 with their left and right side edges in contact with each other. These outer cement plates 31 are also extrusion-molded cement plates mainly made of cement.

[0022] The upper formwork 4 is composed of an inner upper formwork 41 formed of a steel material with a U-shaped cross-section and an outer upper formwork 42. The inner upper formwork 41 is arranged to be in contact with the upper parts of the eight upper cement plates 21 arranged in parallel along the longitudinal direction of the embedded formwork unit 1, and is fixed by screws 43 driven into each of the upper cement plates 21 from the side of the inner upper formwork 41. By installing this inner upper formwork 41, the connected state of the eight upper cement plates 21 can be stably maintained.

[0023] The outer upper formwork 42 is arranged in a direction along the longitudinal direction of the embedded formwork unit 1 so as to be in contact with the upper parts of eight parallel outer cement plates 31 respectively, and is fixed by screws 43 (see Fig. 2) driven into each outer cement plate 31 from the side of the outer upper formwork 42. By attaching this outer upper formwork 42, the connected state of the eight outer cement plates 31 can be stably maintained.

[0024] In addition, the inner upper formwork 41 and the outer upper formwork 42 are connected at a plurality of locations (a plurality of positions spaced apart in the longitudinal direction) by connecting hanging fittings 45. By attaching this connecting hanging fitting 45, the overall rigidity of the embedded formwork unit 1 can be improved. In addition, by locking the hook of a crane to this connecting hanging fitting 45 or inserting a wire, when the embedded formwork unit 1 is moved (including during installation), lifting work and the like can be easily and safely carried out. Further, surface timbers 44 are respectively attached to the back surfaces of the inner upper formwork 41 and the outer upper formwork 42. These surface timbers 44 can have their height positions changed.

[0025] As shown in Fig. 2, the separator 5 is composed of a long bolt 51 with both ends threaded, a fixing fitting 52 (flat steel), a connecting fitting 53, a slitting bolt 54, an L-shaped fitting 55, a nut 56, etc., and is arranged at two upper and lower positions between the upper cement plate 21 constituting the inner embedded formwork 2 and the outer cement plate 31 constituting the outer embedded formwork 3. In the embedded formwork unit 1 of the present embodiment, these separators 5 connect the opposing upper cement plate 21 and outer cement plate 31 (that is, the inner embedded formwork 2 and the outer embedded formwork 3) with a predetermined interval therebetween.

[0026] Specifically, a connecting fitting 53 (a long nut with a flange) is fixed to the back surface (the right side surface in FIG. 2) of the upper cement plate 21, and a fixing fitting 52 is fixed to the back surface (the left side surface in FIG. 2) of the outer cement plate 31. By screwing both ends of the long bolt 51 to the connecting fitting 53 and the fixing fitting 52 respectively, the upper cement plate 21 and the outer cement plate 31 are connected.

[0027] In addition, a slitting bolt 54 is screwed on the opposite side of the connecting fitting 53. The tip of this slitting bolt 54 is arranged to protrude outward from the surface (the left side surface in FIG. 2) of the upper cement plate 21, and an L-shaped fitting 55 and a nut 56 are mounted on the protruding portion. By tightening this nut 56, the upper cement plate 21 is clamped by the L-shaped fitting 55 and the connecting fitting 53, and the connecting fitting 53 is fixed to the upper cement plate 21.

[0028] Also, as shown in FIG. 3 (a horizontal sectional view of the outer cement plate 31 and the fixing fitting 52), the fixing fitting 52 is fixed to the back surface (the lower side surface in FIG. 3) of the outer cement plate 31 with screws 57. And a screw hole 52a capable of screwing the end of the long bolt 51 is formed in this fixing fitting 52. Therefore, as described above, by screwing both ends of the long bolt 51 to the connecting fitting 53 (nut-shaped portion 53b) and the fixing fitting 52 respectively, the upper cement plate 21 and the outer cement plate 31 can be connected.

[0029] As shown in Fig. 1(2), the internal reinforcing bars 6 are formed by a plurality of trapezoidal frame-shaped main-direction reinforcing bars 61 and a plurality of straight longitudinal reinforcing bars 62. Among these, the main-direction reinforcing bars 61 each extend in the main direction of the wall railing (vertical direction) and are arranged at regular intervals (125 mm in this embodiment) in the longitudinal direction of the embedded formwork unit 1. On the other hand, the longitudinal reinforcing bars 62 each extend in the longitudinal direction (horizontal direction), are inserted inside the main-direction reinforcing bars 61, and are bundled with the main-direction reinforcing bars 61 by binding wires. This internal reinforcing bar 6 is arranged in the space between the inner embedded formwork 2 and the outer embedded formwork 3 as shown in Fig. 2, is bundled with the long bolts 51 of the separator 5, and is fixed inside the embedded formwork unit 1.

[0030] The embedded formwork unit 1 of this embodiment is configured as described above. By transporting and installing the required number of pre-manufactured embedded formwork units to the construction site, the wall railing can be formed extremely efficiently. As a result, compared with the prior art, the construction period can be significantly shortened.

[0031] In addition, in Fig. 1, a state where all of the eight sets of upper cement plates 21 and lower cement plates 22 constituting the inner embedded formwork 2 are attached is shown. However, it is preferable to transfer to the construction site in a state before attaching the upper cement plates 21 and lower cement plates 22 at both longitudinal ends respectively (see Fig. 4), and attach the upper cement plates 21 and lower cement plates 22 at both longitudinal ends at specific stages in the construction method of the wall railing.

[0032] (Second Embodiment: Construction Method of Wall Railing) Figs. 4 to 6 are explanatory views of the construction method of the wall railing according to the second embodiment of the present invention (a method of constructing the wall railing using the embedded formwork unit 1 of the first embodiment shown in Figs. 1 to 3).

[0033] As shown in Fig. 4, the ground covering part 7 of the bridge slab to be constructed is pre-constructed with ground covering part reinforcement 8. In this embodiment, the ground covering part reinforcement 8 is composed of loop-shaped main direction reinforcement 81 and straight bridge axis direction reinforcement 82. More specifically, the lower end of the main direction reinforcement 81 is embedded in the concrete body of the ground covering part 7, and each extends in the main direction of the wall high railing (so as to protrude upward from the surface of the ground covering part 7), and is arranged at regular intervals (125 mm in this embodiment) in the bridge axis direction. On the other hand, the bridge axis direction reinforcement 82 extends in the bridge axis direction respectively, is inserted inside the main direction reinforcement 81, and is tied to the main direction reinforcement 81 by binding wires.

[0034] Then, the embedded formwork unit 1 is installed on the ground covering part 7. At this time, as shown in Fig. 4, the embedded formwork unit 1 is in the state before attaching the upper cement plates 21 and the lower cement plates 22 at both ends in the longitudinal direction respectively (or the state after being attached once and then removed), with the inner embedded formwork 2 on the central side of the slab and the outer embedded formwork 3 on the outer side of the slab, and the internal main direction reinforcement 61 (arrangement interval 125 mm) is arranged at positions adjacent to the main direction reinforcement 81 (arrangement interval 125 mm) of the corresponding ground covering part 7 respectively. It should be noted that it may be installed on the ground covering part 7 in the state shown in Fig. 1 (the state where the upper cement plates 21 and the lower cement plates 22 at both ends in the longitudinal direction are attached), and then the upper cement plates 21 and the lower cement plates 22 at both ends in the longitudinal direction are removed respectively.

[0035] The operation of arranging the embedded formwork unit 1 on the ground covering part 7 can be carried out simply and safely by locking the hook of the crane to the connecting suspension fitting 45 or inserting a wire and lifting it.

[0036] After arranging the embedded formwork unit 1 on the ground covering part 7, as shown in Fig. 5, the outer cement plate 31 (outer embedded formwork 3) is fixed to the ground covering part 7. Specifically, the plywood 72 is pre-fixed (screwed) to the outer side surface 71 of the ground covering part 7 so as to protrude upward from the outer edge of the ground covering part 7, and the plywood 72 and the lower end of the outer cement plate 31 are joined and fixed with screws 73.

[0037] Next, as shown in FIG. 5, an additional reinforcing bar 83 is inserted into the space where the main-direction reinforcing bar 61 of the embedded formwork unit 1 and the main-direction reinforcing bar 81 of the ground covering portion 7 overlap, and the additional reinforcing bar 83 and the main-direction reinforcing bar 61 (or the main-direction reinforcing bars 61, 81) are tied together with a binding wire, and the main-direction reinforcing bars 61, 81 are also tied together. At this time, as shown in FIG. 5, by previously rotating the lower end portion 22a of the lower cement plate 22 upward from a position near the surface of the ground covering portion S, the operator can access the inside of the embedded formwork unit 1, and the insertion work and the tying work of the additional reinforcing bar 83 can be carried out smoothly and efficiently.

[0038] Note that the rotating state of the lower cement plate 22 can be stably maintained, for example, as shown in FIG. 5, by connecting the lower end portion 22a of the lower cement plate 22 and the upper-stage L-shaped metal fitting 55 with a wire 24 (or a locking means such as a string or a rod) and suspending (or locking) the lower cement plate 22.

[0039] After the tying work of the additional reinforcing bar 83 is completed, the wire 24 (locking means) is removed (the rotating state is released), the lower cement plate 22 is returned to a predetermined position (the position shown by the broken line in FIG. 5), and after appropriately adjusting the installation height of the embedded formwork unit 1, the lower cement plate 22 is fixed to the ground covering portion 7. Specifically, a plywood 74 is previously fixed to the ground covering portion 7 so as to protrude upward from the surface of the ground covering portion 7 (for example, screwed using an angle material 75 or the like), and the plywood 74 and the lower end portion 22a of the lower cement plate 22 are joined and fixed with screws 76.

[0040] In this way, after fixing one embedded formwork unit 1 on the ground covering part 7, the next embedded formwork unit 1 is arranged at an adjacent position in the bridge axis direction, and the installation work (such as the arrangement of the embedded formwork unit 1, the fixing of the outer cement board 31, the insertion of the additional reinforcing bar 83, the bundling of the reinforcing bars, and the fixing of the lower cement board 22, etc.) is carried out in the same manner. At this point, as shown in FIG. 4, since the upper cement boards 21 and the lower cement boards 22 at both longitudinal ends of the embedded formwork unit 1 are not attached (or have been removed once), openings for two sets of cement boards are formed at the connection part of two adjacent embedded formwork units 1. From this opening, a reinforcing bar for induced joint (not shown) is arranged and bundled so as to connect the internal reinforcing bars 6 of two adjacent embedded formwork units 1.

[0041] As shown in FIG. 6, an induced joint material 91 is arranged at the connection part of these two adjacent embedded formwork units 1 (the center of the opening of two sets of cement boards). Then, the upper cement board 21 and the lower cement board 22 that have not been attached yet (or have been removed once) are respectively attached to both sides of this induced joint material 91 to close the opening.

[0042] By repeating the above procedure the necessary number of times, after the installation of all the embedded formwork units 1 is completed, concrete is placed inside the embedded formwork unit 1 (the space between the inner embedded formwork 2 and the outer embedded formwork 3 shown in FIG. 2). At this time, the height at which the concrete is placed is up to the upper surface of the stringer 44 shown in FIG. 2. As described above, the stringer 44 can change its height position, and therefore, the height position of the top end surface of the formed wall railing can be adjusted as appropriate.

[0043] After that, after the necessary curing period has passed and the concrete has hardened, the upper formwork 4, nut 56, L-shaped metal fitting 55, cut bolt 54, and hinge 23 shown in FIG. 2 are removed, and further, the angle material 75 and plywood 72, 74 shown in FIG. 5 are removed. In addition, it is preferable to drive and fill a repair material (for example, a stick-shaped repair material) of the same material as the upper cement board 21, the outer cement board 31, etc. into the holes (screw holes, etc.) formed by removing these.

[0044] The construction method of the wall railing of this embodiment relates to the configuration as described above. The internal reinforcing bars 6 (see FIG. 1(2)) arranged inside the embedded formwork unit 1 are assembled before being transported to the site. Also, when the concrete placed inside the embedded formwork unit 1 hardens, the inner embedded formwork 2, the outer embedded formwork 3, and the placed concrete are integrated to form a wall railing. Therefore, processes such as steel bar assembly, formwork assembly, and formwork removal at the site can be omitted (or greatly simplified). As a result, a wall railing can be formed extremely efficiently on the bridge deck slab, and the construction period can be significantly shortened compared to the prior art.

Explanation of Reference Numerals

[0045] 1: Embedded formwork unit, 2: Inner embedded formwork, 21: Upper cement board, 22: Lower cement board, 22a: Lower end part, 23: Hinge, 24: Wire, 3: Outer embedded formwork, 31: Outer cement board, 4: Upper formwork, 41: Inner upper formwork, 42: Outer upper formwork, 43: Screw, 44: Lath, 45: Connecting suspension fitting, 5: Separator, 51: Long bolt, 52: Fixed fitting, 52a: Screw hole, 53: Connecting fitting, 54: Cutting bolt, 55: L-shaped fitting, 56: Nut, 57: Screw, 6: Reinforcing bar, 61: Main direction reinforcing bar, 62: Longitudinal direction reinforcing bar, 7: Ground covering part, 71: Outer side surface, 72: Plywood, 73: Screw, 74: Plywood, 75: Angle material, 76: Screw, 8: Ground covering part reinforcing bar, 81: Main direction reinforcing bar, 82: Bridge axis direction reinforcing bar, 83: Additional reinforcing bar, 91: Induced joint material,

Claims

1. It is composed of an inner embedded formwork formed by a plurality of upper cement plates and lower cement plates, an outer embedded formwork formed by a plurality of outer cement plates, a separator that connects the upper cement plate and the outer cement plate facing each other at a predetermined interval, and internal reinforcing bars. The upper cement plates are arranged in parallel along the longitudinal direction of the embedded formwork unit, and are connected and fixed in a state where the left and right side edges are in contact with each other. The lower cement plates are connected to the upper cement plates via hinges and are configured to be rotatable. The outer cement plates are respectively arranged in parallel along the longitudinal direction of the embedded formwork unit, and are respectively connected and fixed in a state where the left and right side edges are in contact with each other. The internal reinforcing bars are formed by main direction reinforcing bars that extend in the vertical direction and are arranged at regular intervals in the longitudinal direction of the embedded formwork unit, and longitudinal reinforcing bars that extend in the longitudinal direction of the embedded formwork unit and are bundled with the main direction reinforcing bars. They are arranged and fixed in the space between the inner embedded formwork and the outer embedded formwork. The embedded formwork unit is characterized by this.

2. The lower cement plate is connected to the upper cement plate in a state where the upper edge portion contacts or is close to the lower edge portion of the upper cement plate below the upper cement plate. The embedded formwork unit according to Claim 1 is characterized by this.

3. The upper cement plate and the outer cement plate facing each other at a predetermined interval are connected by separators arranged at two positions, upper and lower. The embedded formwork unit according to Claim 1 is characterized by this.

4. The internal reinforcing bars are bundled and fixed to the separators. The embedded formwork unit according to Claim 1 is characterized by this.

5. It has an upper formwork composed of an inner upper formwork and an outer upper formwork. The inner upper formwork is fixed so as to be in contact with the upper parts of the upper cement plates in a parallel state in the direction along the longitudinal direction of the embedded formwork unit. The outer upper formwork is fixed so as to be in contact with the upper parts of the outer cement plates in a parallel state in the direction along the longitudinal direction of the embedded formwork unit. The embedded formwork unit according to Claim 1 is characterized by this.

6. The inner upper formwork and the outer upper formwork are connected by a connecting suspension fitting. The embedded formwork unit according to Claim 5 is characterized by this.

7. The embedded formwork unit according to claim 5, characterized in that surface joists with adjustable height positions are respectively attached to the back surfaces of the inner upper formwork and the outer upper formwork.

8. A method for constructing a high wall railing on the floor slab of a bridge using the embedded formwork unit according to any one of claims 1 to 7, comprising: placing the embedded formwork unit on the covering part of the bridge floor slab on which the covering part reinforcement has been previously constructed; fixing the outer cement board to the covering part; rotating the lower cement board to bind the internal reinforcement of the embedded formwork unit and the covering part reinforcement in a state where access to the inside of the embedded formwork unit is possible; fixing the lower cement board to the covering part after releasing the rotation state; casting concrete into the inside of the embedded formwork unit; A method for constructing a high wall railing, characterized in that the inner embedded formwork, the outer embedded formwork, and the cast concrete are integrated to form the high wall railing.

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