Formwork and method for completing concrete pouring using it

Abstract

This prevents the formwork itself from shifting when the concrete is subjected to vibration, and allows for a smoother shape of the concrete's edge. [Solution] The formwork 10 is a formwork used at the end of pouring continuous reinforced concrete pavement, and comprises a formwork body 11 positioned below the reinforcing bars 4. The formwork body 11 is foldable and expands when filled with air to seal the space between the reinforcing bars 4 and the road surface 3.

Description

Technical Field

[0004] , In this state, it is placed between the reinforcing bar and the road surface. ,

[0005] , , , ,

[0006] , It has a flat surface that holds back the concrete. ,

[0001] The present invention relates to a stop formwork and a placing end method using the same.

Background Art

[0002] Patent Document 1 discloses a lath formwork provided with a lath net for supporting the lateral pressure from the preceding concrete in the concrete joint.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a technique such as Patent Document 1, when a lath formwork is arranged below a horizontally extending reinforcing bar in a continuous reinforced concrete pavement, there is a problem that the lath formwork is displaced by the lateral pressure of the concrete when the concrete is vibrated. The present invention has been made in view of the above circumstances, and an object thereof is to provide a stop formwork that can suppress displacement of the stop formwork body when the concrete is vibrated and can smooth the shape of the end face of the concrete, and a placing end method using the same.

Means for Solving the Problems

[0005] To achieve the above object, the stop formwork in the present invention is a stop formwork at the end of placing continuous reinforced concrete pavement, and includes a stop formwork body arranged below the reinforcing bar, and the stop formwork body is folded In this state, it is placed between the reinforcing bar and the road surface. expands when filled with air to seal the space between the reinforcing bar and the road surface It has a flat surface that holds back the concrete. .

[0006] The concrete pouring completion method using a retaining formwork according to the present invention comprises: a placement step of placing a foldable retaining formwork body, which expands when filled with air, between the reinforcing bars and the road surface; a sealing step of filling the retaining formwork body with air and expanding the retaining formwork body to seal the space between the reinforcing bars and the road surface; a pouring step of pouring concrete into the space sealed by the retaining formwork body; a cutting step of cutting the concrete that overflows above the reinforcing bars during pouring and accumulates above the retaining formwork body; and a removal step of removing the retaining formwork body from between the reinforcing bars and the road surface. [Effects of the Invention]

[0007] According to the present invention, it is possible to suppress the displacement of the formwork body when vibration is applied to the concrete, and to make the shape of the end surface of the concrete smooth. [Brief explanation of the drawing]

[0008] [Figure 1] This is a plan view showing continuous reinforced concrete and formwork. [Figure 2] This is a cross-sectional view taken along line II-II in Figure 1. [Figure 3] This is a flowchart showing the method for completing concrete pouring. [Figure 4] This is a plan view showing a stopper formwork in another embodiment. [Figure 5] This is a cross-sectional view showing the area around the end face of concrete in another embodiment. [Modes for carrying out the invention]

[0009] (Embodiment) Embodiments of the present invention will be described below with reference to the drawings. Figure 1 is a plan view showing continuous reinforced concrete 1 and two formwork pieces 10. Figure 2 is a cross-sectional view taken along line II-II of Figure 1. Continuous reinforced concrete pavement is a type of pavement that uses continuously placed steel reinforcing bars to distribute cracks caused by concrete shrinkage and reduce the number of joints.

[0010] The continuous reinforced concrete 1 includes concrete 2 that is poured onto the road surface 3 with reinforcing bars 4 embedded within it. In Figure 1, the left-right direction on the plane of the paper corresponds to the direction in which the road surface 3 extends, and the up-down direction corresponds to the width direction of the road surface 3.

[0011] Reinforcing bars 4 are arranged horizontally on the road surface 3. The reinforcing bars 4 are positioned above the road surface 3 by a predetermined height H2 (see Figure 2). The reinforcing bars 4 include first reinforcing bars 4A and second reinforcing bars 4B. As shown in Figure 1, multiple first reinforcing bars 4A are arranged parallel to the direction in which the road surface 3 extends. Furthermore, the second reinforcing bars 4B are attached to the first reinforcing bars 4A and are arranged at equal intervals, tilted in the direction in which the road surface 3 extends.

[0012] The thickness H1 of concrete 2 (see Figure 2) is, for example, about 25 cm, and the gap between the road surface 3 and the reinforcing bars 4 is about 17 cm.

[0013] When the pouring of concrete 2 is interrupted to perform a joint, formwork is placed to hold back the concrete 2. In this embodiment, a stopper formwork 10 is placed in the gap between the reinforcing bars 4 and the road surface 3 as formwork.

[0014] The retaining formwork 10 includes a retaining formwork body 11 that acts as an air tube. The retaining formwork body 11 is foldable when the air is released.

[0015] The formwork body 11 is provided with a filling port 12. A pump (not shown in the figure) can be attached to and removed from the filling port 12. The formwork body 11 is made of a material such as fibers that prevent concrete 2 from seeping into the interior. The formwork body 11 expands when filled with air and contracts when the air is released.

[0016] As shown in Figure 2, the formwork body 11 has a rectangular cross-section when expanded. The corners of this cross-section are rounded.

[0017] As a procedure for arranging the stop formwork body 11, it is arranged below the reinforcing bar 4 in a wilted state. Next, when the stop formwork 10 is filled with air, it expands between the reinforcing bar 4 and the road surface 3 and is pressed against the reinforcing bar 4 and fixed.

[0018] Thereby, the gap between the reinforcing bar 4 and the road surface 3 is sealed, and the concrete 2 is blocked. Further, when the stop formwork body 11 is used, even if vibration is applied to the placed concrete 2 by a vibrator or the like, the stop formwork body 11 does not shift with respect to the road surface 3, and the concrete 2 can be sealed.

[0019] As shown in FIG. 1, the stop formwork body 11 extends in the width direction of the road surface 3 and is formed in a wedge shape. When viewed from above, the stop formwork body 11 has one surface 14 of the left and right side surfaces in the longitudinal direction formed linearly, and the other surface 15 is formed inclined with respect to the one surface.

[0020] Also, as shown in FIG. 1, the stop formwork for the continuous reinforced concrete 1 has the tip portions of the two stop formwork bodies 11 arranged to overlap each other. That is, the linearly extending surface 14 of one stop formwork body 11 and the inclined extending surface 15 of the other stop formwork body 11 are arranged to overlap each other.

[0021] The width L of the road surface 3 is about 3.5 to 4.5 m for general roads and highways. The width L of the road surface 3 is about 5.0 to 8.0 m for airport roads. By arranging the two stop formwork bodies 11 to overlap each other, when the size of the width L of the road surface 3 changes, the two stop formwork bodies 11 can be arranged while shifting in the width L direction of the road surface 3 with one surface 14 and the other surface 15 aligned, and the concrete 2 of the road surface 3 with a large width L can be sealed.

[0022] With such a configuration, it is easy to change the arrangement of the two stop formwork bodies 11 according to the width L of the road surface 3. Further, since only the tip side of the stop formwork body 11 where one surface 14 faces the concrete 2 becomes a step 16, the shape of the entire end face 2A of the concrete 2 can be made smoother.

[0023] Multiple tags 18 are provided on the side of plate 17 facing the reinforcing bar 4. The tags 18 are semicircular strip-shaped members. The binding wires 19 wrapped around the tags 18 are tied to the reinforcing bar 4, thereby fixing the formwork body 11 to the reinforcing bar 4. As a result, the formwork body 11 is less likely to shift relative to the reinforcing bar 4.

[0024] Next, we will explain the method for completing concrete pouring using the retaining formwork 10. Figure 3 is a flowchart of the concrete pouring completion method. The placement of concrete 2 may be interrupted. This interruption occurs when the scheduled placement for the day is completed, and is an example of a completed placement. When placement is interrupted, it is necessary to complete the placement of concrete 2 to ensure smooth subsequent placement and to prevent crack formation in concrete 2. This improves the quality of the continuous reinforced concrete pavement 1.

[0025] The concrete pouring completion method using the retaining formwork 10 includes a placement step S1 in which the retaining formwork body 11, which is foldable and expands when filled with air, is placed between the reinforcing bars 4 and the road surface 3. It also includes a sealing step S2 in which air is filled into the retaining formwork body 11, causing it to expand and seal the space between the reinforcing bars 4 and the road surface 3. Furthermore, it includes a pouring step S3 in which concrete 2 is poured into the space upstream of the retaining formwork body 11 that has been sealed by the retaining formwork body 11. The poured concrete 2 flows between the reinforcing bars 4 and the road surface 3 and is blocked by the retaining formwork body 11.

[0026] In this case, concrete 2 is also poured above the reinforcing bars 4. A portion of the concrete 2 poured above the reinforcing bars 4 flows over the formwork body 11, as shown by the dashed line in Figure 2, and accumulates above the formwork body 11.

[0027] This concrete placement completion method includes a cutting step S4 for cutting the concrete 2 that overflows above the reinforcing bars 4 during placement and accumulates above the formwork body 11. The cutting position P of the concrete 2 is the boundary between the formwork body 11 and the concrete 2. This concrete pouring completion method includes a removal step S5 in which the formwork body 11 is removed from between the reinforcing bars 4 and the road surface 3. In the removal step S5, air is released from the formwork body 11, and the formwork body 11 is removed from between the reinforcing bars 4 and the road surface 3 in a folded state.

[0028] In this concrete placement completion method, the concrete 2 accumulated above the formwork body 11 is cut in the cutting step S4. After the formwork body 11 is removed from between the reinforcing bars 4 and the road surface 3 in the removal step S5, the end face 2A of the concrete 2 (see Figure 2) becomes smooth, allowing for smoother subsequent concrete placement and suppressing the occurrence of cracks in the concrete 2. This improves the quality of the continuous reinforced concrete pavement 1. Furthermore, the formwork body 11 can be folded and removed from between the reinforcing bars 4 and the road surface 3, making the removal process easier.

[0029] As described above, the formwork 10 of this embodiment is the formwork 10 used when pouring continuous reinforced concrete pavement is completed. The formwork 10 comprises a formwork body 11 positioned below the reinforcing bars 4, and the formwork body 11 is foldable and expands when filled with air to seal the space between the reinforcing bars 4 and the road surface 3. In this configuration, the expanded formwork body 11 is pressed and fixed between the reinforcing bars 4 and the road surface 3. Therefore, it is possible to suppress the displacement of the formwork body 11 when vibration is applied to the concrete 2, and the shape of the end face 2A of the concrete 2 can be made smooth.

[0030] Furthermore, the retaining formwork body 11 has a roughly rectangular cross-sectional shape when filled with air. With this configuration, the surface of the formwork body 11 facing the end face 2A of the concrete 2 becomes flat. Therefore, the shape of the end face 2A of the concrete 2 can be made smooth.

[0031] Furthermore, the formwork body 11 is wedge-shaped when viewed from above, and two formwork bodies 11 are arranged facing each other. With this configuration, the two formwork bodies 11 can be positioned offset in the width direction of the road surface 3. Therefore, even if the width L of the road surface 3 changes, the space between the reinforcing bars 4 and the road surface 3 can be sealed by adjusting the positions of the two formwork bodies 11.

[0032] Furthermore, the formwork body 11 is equipped with a tag 18, and the tag 18 and the reinforcing bar 4 are fastened together with a connection wire 19. In this configuration, the formwork body 11 is fixed to the reinforcing bars 4. Therefore, it is possible to suppress the displacement of the formwork body 11 when vibration is applied to the concrete 2.

[0033] A method for completing the placement of continuous reinforced concrete pavement using a stopper formwork 10, comprising: a placement step S1 in which a foldable stopper formwork body 11 that expands when filled with air is placed between the reinforcing bars 4 and the road surface 3; a sealing step S2 in which air is filled into the stopper formwork body 11 to expand it and seal the space between the reinforcing bars 4 and the road surface 3; a placement step S3 in which concrete 2 is placed into the space sealed by the stopper formwork body 11; a cutting step S4 in which concrete 2B that overflows above the reinforcing bars 4 during placement and accumulates above the stopper formwork body 11; and a removal step S5 in which the stopper formwork body 11 is removed from between the reinforcing bars 4 and the road surface 3. In this configuration, the expanded formwork body 11 is pressed and fixed between the reinforcing bars 4 and the road surface 3. Therefore, it is possible to suppress the displacement of the formwork body 11 when vibration is applied to the concrete 2, and the shape of the end face 2A of the concrete 2 can be made smooth.

[0034] (Other embodiments) Although the present invention has been described above based on one embodiment, the present invention is not limited thereto, and various modifications are possible, for example, such as the shape and number of the formwork bodies 11. Furthermore, the plate 17 provided by the formwork body 11 may not be a single plate but may be divided into two or more parts. Also, two or more formwork bodies 11 may be of different sizes and shapes and placed below the reinforcing bars 4.

[0035] Figure 4 is a plan view showing the retaining formwork 10 in another embodiment. The formwork body 11 may have a plate 17 on one of its longitudinal surfaces 14, as shown in Figure 4. The plate 17 is either sewn or attached to the formwork body 11.

[0036] The plate 17 is a flexible plate. The plate 17 is, for example, a plate-shaped member made of resin. The flat surface of the plate 17 contacts the end face 2A of the concrete 2. If the shape of the end face 2A is not smooth in the height direction, it may overlap with the concrete 2 that will be poured next in the height direction, which may reduce the quality of the continuous reinforced concrete 1. In other embodiments, the formwork 10 includes a plate 17 that faces the side of the poured concrete 2 in the formwork body 11. In this configuration, the plate 17 blocks the end face 2A of the concrete 2. Therefore, the shape of the end face 2A of the concrete 2 can be made smooth.

[0037] This is also a cross-sectional view showing the area around the end face 2A of the concrete 2 in another embodiment. As shown in Figure 5, unlike the above embodiment, a separate formwork may be placed to prevent concrete 2B from overflowing above the reinforcing bars 4 during pouring and accumulating above the formwork body 11. In Figure 5, a formwork comprising a wooden plate member 100 positioned opposite the end face 2A of the concrete 2, and a plurality of wooden square timbers 101 fixed to the plate member 100 by nails 103, is placed on top of the reinforcing bars 4. Furthermore, the rear ends of the wooden square timbers 101 are fixed by iron pins 102 driven into the road surface 3 to prevent the plate member 100 and the square timbers 101 from being pushed and moved by the concrete 2.

[0038] In configurations of other embodiments, after the sealing step S3, an installation step is performed in which a wooden formwork is installed. In the specific procedure for installing the wooden formwork, a plate member 100 is installed in line with the end face 2A of the concrete 2 above the reinforcing bar 4, a square timber 101 is installed behind the plate member 100, and the square timber 101 is secured with iron pins 102. The installation position of the square timber 101 is such that it does not overlap with the filling opening 12 or the tag 18 in the vertical direction. Next, the plate member 100 and the square timber 101 are secured by driving nails 103 through them. Furthermore, after the concrete placement step S3, the cutting step S4, which involves cutting the concrete 2 that overflows above the reinforcing bars 4 during placement and accumulates above the formwork body 11, is omitted, and the process proceeds to the removal step S5. In the removal step S5, in addition to removing the formwork body 11 from between the reinforcing bars 4 and the road surface 3, the wooden formwork is also removed. According to the configuration of these other embodiments, the work after the concrete pouring is completed is simplified. [Explanation of symbols]

[0039] 1. Continuous reinforced concrete 2 Concrete 2A end face 3 Road surface 4 Reinforcement bars 4A First Reinforcement Bar 4B Second reinforcing bar 10. Stopping formwork 11. Main body of the formwork 12 filling ports 14 One side 15 The other side 16 steps 17 Plates 18 tags 19 Wiring H thickness L width

Claims

1. This is a formwork used at the end of pouring continuous reinforced concrete pavement. It comprises a formwork body positioned below the reinforcing bars, the formwork body being positioned between the reinforcing bars and the road surface in a folded state, and having a flat surface that expands when air is filled to seal the space between the reinforcing bars and the road surface and dam the concrete. Formwork.

2. The aforementioned formwork body has a roughly rectangular cross-sectional shape when filled with air. The formwork according to claim 1.

3. The aforementioned formwork body is wedge-shaped when viewed from above. The two aforementioned formwork bodies are arranged facing each other. The formwork according to claim 1 or 2.

4. The aforementioned formwork body is equipped with a tag, and the tag and the reinforcing bar are fastened together with a wire. The formwork according to claim 1 or 2.

5. The aforementioned formwork body includes a plate facing the side where the concrete has been poured. The formwork according to claim 1 or 2.

6. A method for completing the placement of continuous reinforced concrete pavement using a stop formwork, A placement step for positioning a foldable formwork body that inflates when filled with air between the reinforcing bars and the road surface, A sealing step in which air is filled into the formwork body and the formwork body is inflated to seal the space between the reinforcing bars and the road surface, A pouring step in which concrete is poured into the space sealed by the aforementioned formwork body, A cutting step for cutting the concrete that overflows above the reinforcing bars during the pouring process and accumulates above the formwork body, The system includes a removal step of removing the formwork body from between the reinforcing bar and the road surface. A method for completing concrete pouring using a fixed formwork.

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