Filling system and filling method of cement-based composition

Abstract

To efficiently fill a formwork with a cement-based composition.SOLUTION: A filling system 10 comprises: a pump device 80; a pressure-feeding piping 20 circulating a cement-based composition; a formwork 40 which is filled with the cement-based composition from a filling port 41A; opening / closing means 50 that is in an open state to open the filling port 41A during filling and is switched to a closed state to close the filling port 41A when filling is completed; first communication blocking means 43 which has a first communication portion 46A that makes a space above one end of the formwork 40 communicate with the outside and is switched to a blocked state when the cement-based composition starts to flow out of the first communication portion 46A in a communication state to allow air to flow out; and second communication blocking means 44 which has a second communication portion 46A that makes a space above the other end of the formwork 40 communicate with the outside and is switched to a blocked state when the cement-based composition starts to flow out of the second communication portion 46A in a communication state to allow air to flow out.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a filling system for cementitious compositions and a filling method, and particularly to a technique suitable for filling fiber-reinforced cementitious compositions.

Background Art

[0002] For example, Patent Documents 1 and 2 disclose a technique in which high-strength fiber-reinforced concrete is filled into the formwork at the joint between precast concrete floor slabs to join the precast concrete floor slabs to each other. Further, Patent Document 3 discloses a technique in which high-strength fiber-reinforced concrete is pumped by a concrete pump and filled into a formwork.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] A formwork filled with a cement-based composition such as high-strength fiber-reinforced concrete has high airtightness to prevent leakage of the cement-based composition. However, if the formwork is too airtight, there is a problem that the end of the formwork (e.g., the gable) will not allow air to escape during filling, resulting in poor filling. In addition, there is a problem that large air holes remain in the hardened cement-based composition when entrapped air is mixed into the cement-based composition during pumping with a concrete pump, causing the air bubbles to bond together. In addition, in order to prevent air from being mixed in, the cement-based composition needs to be filled from below, which restricts the construction conditions.

[0005] The technology of the present disclosure has been made in consideration of the above circumstances, and has an object to provide a technology that can efficiently fill a cement-based composition into a formwork. [Means for solving the problem]

[0006] The filling system of the present disclosure comprises: A cementitious composition filling system (10), comprising: A pump device (80) for pumping the cementitious composition; a pressure-feeding pipe (20) for circulating the cement-based composition pumped from the pump device (80); a formwork (40) into which the cementitious composition is filled through a filling port (41A) from the pressure-feeding pipe (20); an opening / closing means (50) that is in an open state for opening the filling port (41A) when the cement-based composition is filled, and that is switched to a closed state for closing the filling port (41A) when the filling of the cement-based composition is completed; It has a first communication part (46A, 60) that communicates the space above one end part inside the formwork (40) with the outside. In a communication state where the air inside the formwork (40) flows out to the outside through the first communication part (46A, 60), when the cementitious composition starts to flow out from the first communication part (46A, 60) as the cementitious composition is filled, there is a first communication blocking means (43, 60) that can be switched to a blocking state to block the outflow of the cementitious composition from the first communication part (46A, 60). It has a second communication part (46A, 60) that communicates the space above the other end part inside the formwork (40) with the outside. In a communication state where the air inside the formwork (40) flows out to the outside through the second communication part (46A, 60), when the cementitious composition starts to flow out from the second communication part (46A, 60) as the cementitious composition is filled, there is a second communication blocking means (44, 60) that can be switched to a blocking state to block the outflow of the cementitious composition from the second communication part (46A, 60). It is characterized by this.

[0007] In the filling system (10) of the present disclosure, The first communication blocking means (43) includes a first window part (46A) as the first communication part that opens above one end part of the formwork (40), and a first window opening / closing means (49) that can open and close the first window part (46A). It is preferable that the second communication blocking means (44) includes a second window part (46A) as the second communication part that opens above the other end part of the formwork (40), and a second window opening / closing means (49) that can open and close the second window part (46A).

[0008] In the filling system (10) of another aspect of the present disclosure, When at least one of one end part and the other end part of the formwork (40) is a joint part, the first communication part or the second communication part on the side that becomes the joint part may be constituted by a cylindrical pipe member (60) that positions one opening above the end part inside the formwork (40) and positions the other opening outside the formwork (40).

[0009] The filling system (10) of other aspects of the present disclosure is pressure sensors (90, 95) for measuring the pressure in the pressure-feeding pipe (20) and / or the pressure in the mold (40), and a display device (100, 110, 200) for displaying the measurement results of the pressure sensors (90, 95). It is desirable that the filling system further includes these components.

[0010] The filling method of the present disclosure is a method for filling a cementitious composition using the filling system (10), a first step of starting the filling of the cementitious composition into the mold (40) by opening the opening / closing means (50) and bringing the first communication blocking means (43) and the second communication blocking means (44) into a communicating state and operating the pump device (80); a second step of switching to a blocking state the side from which the cementitious composition has started to flow out among the first communication blocking means (43) or the second communication blocking means (44); a third step of temporarily stopping the operation of the pump device (80) when the cementitious composition starts to flow out from the first communication blocking means (43) or the second communication blocking means (44) that has not been switched to the blocking state in the second step; a fourth step of switching to a blocking state the first communication blocking means (43) or the second communication blocking means (44) that has not been switched to the blocking state in the second step and restarting the operation of the pump device (80); a fifth step of stopping the pump device (80) and switching the opening / closing means (50) to a closed state when the pressure in the mold (40) rises to a predetermined pressure due to the restart of the operation of the pump device (80). It is characterized by the above.

[0011] In the above description, for the purpose of facilitating the understanding of the present disclosure, reference numerals used in the embodiments are attached to the constituent elements corresponding to the embodiments in parentheses. However, each constituent element is not limited to the embodiments defined by the above reference numerals.

Advantages of the Invention

[0012] According to the technology of the present disclosure, a cement-based composition can be efficiently filled into a formwork.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Modes for Carrying Out the Invention

[0014] Hereinafter, based on the accompanying drawings, a filling system and a filling method according to the present embodiment will be described.

[0015] [Overall Configuration] FIG. 1 is a schematic diagram for explaining an example of a site where fiber-reinforced concrete is placed using the filling system 10 according to the present embodiment. The site shown in FIG. 1 is a site for a floor slab renewal work in which an existing floor slab of a bridge 1 is replaced with a new floor slab 2. Note that the filling system 10 of the present disclosure is not limited to the floor slab renewal work of the illustrated example, and can be widely applied to construction sites of concrete structures where fiber-reinforced concrete is placed, such as new construction work of bridges, new construction work or renewal work of tunnels, new construction work or renewal work of dams, and construction work of reinforced concrete buildings. Hereinafter, the floor slab renewal work will be described as an example.

[0016] The bridge 1 is, for example, a road bridge such as an exclusive automobile road, and includes a traffic lane L for vehicles to travel and a road shoulder S where vehicles can retreat in case of emergency. Note that the bridge 1 may not include the road shoulder S. In the floor slab renewal work, if traffic control is implemented during a time period with a large traffic volume such as during the day, the impact on the surrounding traffic environment will be large. Therefore, in the example shown in FIG. 1, a temporary protective fence 8 is installed between the traffic lane L and the road shoulder S, and the area on the road shoulder S side of the temporary protective fence 8 is set as a work zone W for performing work, and the traffic lane L is open to traffic.

[0017] Within the work zone W, operations such as removal of the existing floor slab, installation of the new floor slab 2, driving of joint concrete into the joint portion 6 between the newly installed new floor slabs 2, 2, and installation of a new wall railing 5 on the covering portion 4 of the new floor slab 2 are performed. When the existing floor slab in a predetermined section on the road shoulder S side is replaced with the new floor slab 2, the work zone W is set in the area on the traffic lane L side. The work zone W is a narrow space with a short road width so as not to affect the passage of vehicles in any case where it is set on either the road shoulder S side or the traffic lane L side.

[0018] In the floor slab renewal work shown in FIG. 1, high-strength and highly durable fiber-reinforced concrete is driven into the joint portion 6. Examples of such fiber-reinforced concrete include ultra-high strength fiber-reinforced concrete (hereinafter referred to as UFC) containing steel fibers or the like.

[0019] The filling system 10 of this embodiment is a system for efficiently filling and constructing UFC at a placement location such as the joint part 6, and is arranged within the work zone W. Specifically, the filling system 10 includes a pump device 80 for pumping the UFC manufactured by the mixer device 70, a pressure - feeding pipe 20 through which the UFC is pressure - fed from the pump device 80, and a formwork (in the illustrated example, the formwork 40 of the joint part 6) filled with the UFC from the pressure - feeding pipe 20.

[0020] The mixer device 70 is provided with a manufacturing hopper (not shown) into which various materials of UFC (such as concrete, steel fibers, etc.) are charged. The manufacturing hopper is provided with stirring blades (not shown), and manufactures UFC by rotating the stirring blades to knead various materials of UFC. The UFC manufactured by the mixer device 70 is charged into the pump hopper 85 provided in the pump device 80.

[0021] In addition, when the total quantity of UFC placed in one day is more than the quantity of UFC in one batch that can be manufactured by the mixer device 70, an intermediate receiving hopper (not shown) for temporarily storing the UFC manufactured by the mixer device 70 may be arranged between the mixer device 70 and the pump device 80. It is desirable that the capacity of the intermediate receiving hopper is larger than the capacity of the pump hopper 85 and also larger than the capacity of the manufacturing hopper. If the intermediate receiving hopper is arranged, the mixer device 70 can start manufacturing the next batch of UFC by discharging the entire amount of the manufactured batch of UFC into the intermediate receiving hopper, and the pump device 80 can receive the supply of the next UFC from the intermediate receiving hopper before all the UFC in the pump hopper 85 is exhausted. That is, it becomes possible to realize continuous pumping of UFC by the pump device 80.

[0022] The pump device 80 is a so-called piston type (parallel sliding type) concrete pump, which is arranged adjacent to the mixer device 70. The pump device 80 discharges the UFC input into the pump hopper 85. A pressure conveying pipe 20 is connected to the discharge pipe 88 of the pump device 80. When the UFC is manufactured at a location other than the construction site, the pump device 80 may be a concrete pump truck.

[0023] The pressure conveying pipe 20 is a pipe for supplying the UFC discharged from the pump device 80 to a desired placement location (in the illustrated example, the formwork 40 of the joint portion 6). The pressure conveying pipe 20 is, for example, a steel pipe, and is composed of connecting a plurality of straight pipes and elbow pipes by pipe joints 25. In the illustrated example, the pressure conveying pipe 20 is connected to a filling pipe 30 provided at the lower part of the formwork 40 so as to fill the formwork 40 with the UFC from the lower side, but it may be connected so as to fill the formwork 40 with the UFC from the upper side. The pipe diameter of the pressure conveying pipe 20 is not particularly limited, but it is desirable to use a 2 - 3 inch pipe and set the discharge amount of the pump device 80 to about 0.5 - 1.5 m 3 / h. By setting it in such a combination, it becomes possible to realize stable pressure conveyance of the UFC.

[0024] In the configuration shown in FIG. 1, only one pump device 80 is shown, but it is also possible to realize pressure conveyance of the UFC over a longer distance by connecting a plurality of pump devices 80 in series by the pressure conveying pipe 20. If the pump devices 80 are connected in series, it becomes possible to supply the UFC to a more distant placement location without moving the mixer device 70 from its initial installation position.

[0025] Incidentally, in order to prevent the leakage of UFC filled in the formwork 40, it is conceivable to enhance the sealing performance of the formwork 40. However, if the sealing performance of the formwork 40 is too high, there is a problem that filling defects occur because there is no escape space for the internal air at the end of the formwork 40 (for example, the flange part) during the filling of UFC. Also, during the pressure feeding by the pump device 80, there is a problem that large air holes remain in the UFC cured in the formwork 40 due to the entrapment of air in the UFC and the combination of air bubbles. Further, in order to reduce the mixing of air, it is necessary to fill the formwork 40 with UFC from below, and there is also a problem that the construction conditions are limited to filling from below. In the present embodiment, these problems are solved by optimizing the structure of the formwork 40 and the construction procedure during filling. Hereinafter, the filling system 10 and the details of the filling method according to the present embodiment will be described.

[0026] [Filling System] FIG. 2 is a schematic overall configuration diagram showing the filling system 10 according to the present embodiment. In FIG. 2, the filling pipe 30 is provided at the lower part of the formwork 40, showing an example of filling the formwork 40 with UFC from below. However, by providing the filling pipe 30 at the upper part of the formwork 40, it is also possible to fill the formwork 40 with UFC from above. Hereinafter, the case of filling the formwork 40 with UFC from below will be described as an example.

[0027] As shown in FIG. 2, the pressure feeding pipe 20 includes a plurality of straight pipes 21, elbow pipes 22, and sensor fixing pipes 23. These pipes 21, 22, 23 are connected to each other by pipe joints 25. Sensor fixing pipes 23 are provided at the upstream end, downstream end, and intermediate part of the pressure feeding pipe 20, respectively. The sensor fixing pipe 23 at the upstream end is connected to the discharge pipe 88 of the pump device 80 via a pipe joint 25. The sensor fixing pipe 23 at the downstream end is connected to the filling pipe 30 via a pipe joint 25.

[0028] The sensor fixing pipe 23 is a linear pipe shorter than the straight pipe 21. A pipe pressure sensor 90 capable of measuring the pressure in the pipe flow path is attached to the sensor fixing pipe 23. As shown in FIG. 3, the sensor fixing pipe 23 is provided with a female screw portion 24. The pipe pressure sensor 90 is attached to the sensor fixing pipe 23 by screwing the male screw portion 91 of the sensor body into the female screw portion 24. Note that the pipe pressure sensor 90 can also be attached to the straight pipe 21 or the elbow pipe 22 by providing a female screw portion 24 in the straight pipe 21 or the elbow pipe 22.

[0029] In the present embodiment, the pipe pressure sensors 90 are provided at three locations in the pressure feeding pipe 20. Specifically, it includes a first pipe pressure sensor 90A provided at the upstream end side of the pressure feeding pipe 20, a second pipe pressure sensor 90B provided at a substantially middle portion of the pressure feeding pipe 20, and a third pipe pressure sensor 90C provided at the downstream end side of the pressure feeding pipe 20. Hereinafter, when there is no need to distinguish between the pipe pressure sensors 90A, 90B, and 90C, these are also simply referred to as "pipe pressure sensors 90". The pipe pressure sensor 90 transmits the measured pressure value in the pipe flow path to the terminal device 100 through wired communication or wireless communication. Note that the number of pipe pressure sensors 90 provided in the pressure feeding pipe 20 is not limited to three, and may be two or less, or may be four or more. The number and installation position of the pipe pressure sensors 90 may be appropriately determined according to the specific length of the pressure feeding pipe 20 and the like.

[0030] The formwork 40 includes a rectangular plate-shaped bottom formwork 41, a rectangular plate-shaped upper formwork 42, and first and second windowed formworks 43 and 44 located at the side portions (end portions). The first windowed formwork 43 is an example of the first communication blocking means of the present disclosure, and the second windowed formwork 44 is an example of the second communication blocking means of the present disclosure. As shown in FIG. 4, the side surface of the formwork 40 is constituted by the end surface 2A of the newly constructed floor slab 2. The end surface 2A is provided with, for example, a convex shear key 2B with deformed reinforcing bars 2C protruding therefrom.

[0031] The bottom mold 41 is formed with a filling port 41A for filling the UFC into the mold 40. Further, a plurality of mold pressure sensors 95 capable of measuring the pressure inside the mold 40 are attached to the bottom mold 41.

[0032] In the present embodiment, the mold pressure sensors 95 are provided at three locations on the bottom mold 41. Specifically, a first mold pressure sensor 95A provided near the filling port 41A of the bottom mold 41, a second mold pressure sensor 95B provided at a substantially middle portion of the bottom mold 41, and a third mold pressure sensor 95C provided near an end portion on the side opposite to the filling port 41A of the bottom mold 41 are provided. Hereinafter, when it is not necessary to distinguish the mold pressure sensors 95A, 95B, and 95C, these are also simply referred to as "mold pressure sensors 95".

[0033] The mold pressure sensor 95 is attached to the bottom mold 41 by screwing the male screw portion of the sensor body into the female screw portion provided on the bottom mold 41, similar to the pipe pressure sensor 90. The mold pressure sensor 95 transmits the measured pressure value inside the mold 40 to the terminal device 100 through wired communication or wireless communication. Note that the number of mold pressure sensors 95 provided on the bottom mold 41 is not limited to three, and may be two or less, or may be four or more. The number and installation position of the mold pressure sensors 95 may be appropriately determined according to the specific length of the bottom mold 41 and the like. Further, the mold pressure sensor 95 can also be provided at other parts capable of measuring the pressure inside the mold 40, such as the upper mold 42.

[0034] The filling pipe 30 is fixed to the lower surface of the bottom mold 41. A shutter valve 50 is provided between the filling pipe 30 and the bottom mold 41. The shutter valve 50 is an example of the opening / closing means of the present disclosure, and communicates the filling port 41A with the pipe flow path of the filling pipe 30 in the open state, and closes the filling port 41A in the closed state. Hereinafter, the specific structure of the shutter valve 50 will be described.

[0035] FIG. 5 is a schematic perspective view showing a shutter valve 50 according to the present embodiment. FIG. 6 is a schematic cross-sectional view showing the shutter valve 50 according to the present embodiment. As shown in FIGS. 5 and 6, the shutter valve 50 has a three-layer structure including a plurality of long plate-like members. Specifically, the shutter valve 50 includes a front plate member 51, a back plate member 52, a pair of intermediate plate members 53 and 54, and a shutter plate member 55.

[0036] The front plate member 51 and the back plate member 52 are formed in the same rectangular long plate shape. Through holes 51A and 52A having substantially the same diameter as the filling port 41 of the bottom form 41 are concentrically provided at substantially the center of the front plate member 51 and the back plate member 52. The intermediate plate members 53 and 54 are formed in a rectangular long plate shape with a width shorter than that of the front plate member 51 or the back plate member 52. The length in the longitudinal direction of the intermediate plate members 53 and 54 is preferably formed to be the same as that of the front plate member 51 or the back plate member 52. The intermediate plate members 53 and 54 are provided between the front plate member 51 and the back plate member 52 at a predetermined interval in the width direction.

[0037] The shutter plate member 55 is formed in a rectangular long plate shape longer than the front plate member 51 or the back plate member 52. The plate thickness of the shutter plate member 55 is formed to be substantially the same as that of the intermediate plate members 53 and 54. Flange portions 55B and 55C are provided at both ends in the longitudinal direction of the shutter plate member 55. The shutter plate member 55 is inserted slidably in the longitudinal direction into the space defined by the front plate member 51, the back plate member 52, and the intermediate plate members 53 and 54.

[0038] The shutter plate member 55 is provided with a through hole 55A that communicates with the through holes 51A and 52A when one flange portion 55B abuts against one end portion of the surface plate member 51, and does not overlap with the through holes 51A and 52A when the other flange portion 55C abuts against the other end portion of the surface plate member 51. That is, the shutter valve 50 is configured to easily switch the filling port 41 of the bottom formwork 41 to an open state or a closed state by applying a blow to the flange portions 55B and 55C with a hammer or the like and sliding the shutter plate member 55 in the direction of arrow A or arrow B in the figure.

[0039] FIG. 7 is a schematic perspective view showing the first windowed formwork 43 and the second windowed formwork 44 according to the present embodiment. The first windowed formwork 43 and the second windowed formwork 44 basically have the same configuration. Therefore, hereinafter, the details of the first windowed formwork 43 will be described, and the description of the second windowed formwork 44 will be omitted.

[0040] As shown in FIG. 7, the first windowed formwork 43 has a three-layer structure including a plurality of long plate-shaped members. Specifically, the first windowed formwork 43 includes an outer surface plate member 45 facing the outside of the formwork, an inner surface plate member 46 facing the inside of the formwork, a pair of intermediate plate members 47 and 48, and a shutter plate member 49.

[0041] The inner surface plate member 46 is formed in a rectangular long plate shape. A window hole 46A is formed through the upper end side of the inner surface plate member 46. The outer surface plate member 45 and the intermediate plate members 47 and 48 are formed in a rectangular long plate shape smaller than the inner surface plate member 46. The intermediate plate members 47 and 48 are formed in a rectangular long plate shape with a shorter width than the inner surface plate member 46 and the outer surface plate member 44. The intermediate plate members 47 and 48 are provided between the inner surface plate member 46 and the outer surface plate member 45 at a predetermined interval in the width direction. The outer surface plate member 45 is attached so as to sandwich the intermediate plate members 47 and 48 between the inner surface plate member 46 so as to be positioned below the window hole 46A.

[0042] The shutter plate member 49 is formed in a rectangular long plate shape that is longer than the outer surface plate member 45. The plate thickness of the shutter plate member 49 is formed to be substantially the same as that of the intermediate plate members 47 and 48. Flange portions 49B and 49C are respectively provided at both longitudinal ends of the shutter plate member 49. The shutter plate member 49 is inserted into the space defined by the inner surface plate member 46, the outer surface plate member 45, and the intermediate plate members 47 and 48 so as to be slidable in the longitudinal direction (vertical direction).

[0043] The shutter plate member 49 opens the window hole 46A when the upper flange portion 49B abuts against the upper end portion of the outer surface plate member 45, and closes the window hole 46A when the lower flange portion 49C abuts against the lower end portion of the outer surface plate member 45. That is, the first windowed formwork 43 is configured to be able to easily switch the window hole 46A to an open state (communicating state) or a closed state (blocking state) by applying a blow to the flange portions 49B and 49C with a hammer or the like and sliding the shutter plate member 49 in the direction of arrow A or arrow B in the figure.

[0044] In addition, when one or both ends of the formwork 40 become the joint portions, the first windowed formwork 43 and the second windowed formwork 44 cannot be installed. In such a case, as shown in FIG. 8, a cylindrical pipe member 60 for air discharge is used. Hereinafter, the details of the modification using the pipe member 60 will be described.

[0045] FIG. 8 is an example of discharging the air in the formwork 40 downward using the pipe member 60. The pipe member 60 is a cylindrical body longer than the height of the formwork 40 and has a locking flange portion 61 at one end. The pipe member 60 is inserted into the insertion hole 41B provided in the bottom formwork 41 so that the locking flange portion 61 is located inside the formwork 40.

[0046] As shown in Fig. 8(A), until all the air above the end inside the mold 40 is discharged from the start of filling the UFC, the pipe member 60 is held so that the locking flange portion 61 abuts against the lower surface of the upper mold 42. The air accumulated above the end inside the mold 40 is discharged to the outside from below through the pipe member 60. If it is visually confirmed that the UFC has started to flow out from the pipe member 60, as shown in Fig. 8(B), the pipe member 60 is pulled down until the locking flange portion 61 abuts against the upper surface of the bottom mold 41. At this time, the lower end opening of the pipe member 60 may be blocked by a cap or the like (not shown). In this way, by discharging the air inside the mold 40 using the pipe member 60, it becomes possible to reliably fill the UFC without causing filling defects even at the joint part.

[0047] In addition, when the pipe member 60 can protrude above the mold 40, as shown in Fig. 9, it is also possible to install the pipe member 60 on the upper mold 42. In this case, the pipe member 60 may be inserted into the insertion hole 42B provided in the upper mold 42. If it is visually confirmed that the UFC has started to flow out from the pipe member 60, it may be blocked by closing the upper end opening of the pipe member 60 using a cap or the like (not shown).

[0048] Referring to Fig. 2 again, the terminal device 100 is a so-called microcomputer including a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), an interface device IF, etc. The terminal device 100 includes a display device 110 such as a display, and an operation device 120 such as a keyboard and a mouse. Further, the terminal device 100 is communicably connected to an external terminal device 200 via the interface device IF. The external terminal device 200 is, for example, a personal computer installed in a remote office away from the site, or a portable terminal such as a smartphone or a tablet carried by a field worker.

[0049] The terminal device 100 causes the pressure values (measurement results) sequentially transmitted from the pipe pressure sensor 90 and the formwork pressure sensor 95 to be displayed in real time on the display device 110 and / or the display of the external terminal device 200. Hereinafter, the pressure value in the pressure-feeding pipe 20 measured by the pipe pressure sensor 90 is referred to as "pipe pressure value P", and the pressure value in the formwork 40 measured by the formwork pressure sensor 95 is referred to as "formwork pressure value F".

[0050] Here, consider the case where some abnormality such as pipe blockage or leakage occurs in the filling system 10 during the filling of the UFC into the formwork 40. For example, when the first pipe pressure value P1 measured by the first pipe pressure sensor 90A does not rise to the desired pressure value, it is presumed that a failure or the like has occurred in the pump device 80. Also, although the first pipe pressure value P1 measured by the first pipe pressure sensor 90A has reached the desired pressure value, when the second pipe pressure value P2 measured by the second pipe pressure sensor 90B does not rise to the desired pressure value, it is presumed that there is a blockage or leakage in the pressure-feeding pipe 20 between the first pipe pressure sensor 90A and the second pipe pressure sensor 90B. Further, when the pipe pressure value P measured by the pipe pressure sensor 90 is normal but the formwork pressure value F measured by the formwork pressure sensor 95 does not rise to the desired pressure value, it is presumed that some abnormality has occurred in the formwork 40. The on-site worker can grasp these occurrences of abnormalities by checking the pipe pressure value P and the formwork pressure value F displayed in real time on the display device 110.

[0051] [Filling Method] Next, the filling method of the UFC using the filling system 10 according to the present embodiment will be described. FIG. 10 is a schematic diagram of the formwork 40 for explaining the procedure of the UFC filling construction according to the present embodiment. FIG. 11 is a flowchart for explaining the procedure of the UFC filling construction according to the present embodiment. Note that the following steps start from the state where the production of the UFC by the mixer device 70 is completed and the UFC is charged into the pump hopper 85.

[0052] First step: As shown in Fig. 10(A), open the shutter valve 50, the first windowed formwork 43, and the second windowed formwork 44, and operate the pump device 80 to start pumping the UFC into the pressure delivery pipe 20 and filling the formwork 40 with the UFC (step S100).

[0053] Second step: Visually check whether the UFC has started to flow out from the first windowed formwork 43 (window hole) (step S110). As shown in Fig. 10(B), if the UFC has started to flow out from the first windowed formwork 43 (Yes), switch the first windowed formwork 43 to the closed state (step S120). If the UFC has not started to flow out from the first windowed formwork 43 (No), detect an abnormality based on the pipe pressure value P and the formwork pressure value F (step S200). If no abnormality is detected (No), continue filling the UFC. If an abnormality is detected (Yes), interrupt the filling of the UFC (step S210). After interruption, identify the abnormal location, correct the abnormal location, and then resume filling the UFC.

[0054] Third step: Visually check whether the UFC has started to flow out from the second windowed formwork 44 (window hole) (step S130). As shown in Fig. 10(C), if the UFC has started to flow out from the second windowed formwork 44, temporarily stop the operation of the pump device 80 (step S140). If the UFC has not started to flow out from the second windowed formwork 44 (No), detect an abnormality based on the pipe pressure value P and the formwork pressure value F (step S220). If no abnormality is detected (No), continue filling the UFC. If an abnormality is detected (Yes), interrupt the filling of the UFC (step S230). After interruption, identify the abnormal location, correct the abnormal location, and then resume filling the UFC.

[0055] Fourth step: As shown in Fig. 10(D), after switching the second windowed formwork 44 to the closed state (step S150), restart the pump device 80 (step S160).

[0056] Step 5: Check whether the pressure in the mold 40 has risen to a predetermined pressure by restarting the pump device 80 (step S170). Specifically, check whether the mold pressure value F measured by the mold pressure sensor 95 has reached a desired pressure value. The specific numerical value of the pressure value is not particularly limited, but it may be set based on a value higher than the pressure during UFC filling in the first step or the second step (for example, 200 kPa or more).

[0057] If the pressure in the mold 40 has risen to the predetermined pressure (Yes), as shown in FIG. 10(E), after stopping the operation of the pump device 80, the filling of the UFC is completed by switching the shutter valve 50 to the closed state (step S180). If the pressure in the mold 40 does not rise to the predetermined pressure (No), an abnormality is detected based on the pipeline pressure value P and the mold pressure value F (step S240). If no abnormality is detected (No), the filling of the UFC is continued. If an abnormality is detected (Yes), the filling of the UFC is interrupted (step S250). After the interruption, the abnormal location is identified, and after correcting the abnormal location, the filling of the UFC is restarted.

[0058] According to the present embodiment described in detail above, windowed molds 43 and 44 are provided at both ends of the mold 40. As the UFC is filled into the mold 40, when the UFC starts to flow out from one of the windowed molds 43, the windowed mold 43 is switched to the closed state, and when the UFC starts to flow out from the other windowed mold 44, the windowed mold 44 is switched to the closed state. That is, the air accumulated on the upper side of the end portion in the mold 40 during the filling of the UFC can be surely discharged to the outside from the windowed molds 43 and 44. Thereby, while efficiently filling the UFC into the mold 40, it is possible to effectively prevent filling defects of the UFC.

[0059] Also, according to the present embodiment, when the UFC starts to flow out from the other windowed formwork 44, the driving of the pump device 80 is temporarily stopped, and the pump device 80 is restarted in a sealed state where both the windowed formworks 43 and 44 are closed, thereby increasing the pressure inside the formwork 40. As a result, it becomes possible to reliably fill the UFC into the filling defect portion while reducing the entrapped air, and effectively prevent large air holes from remaining in the hardened UFC.

[0060] Further, according to the present embodiment, with respect to the formwork 40, the UFC can be effectively filled without causing filling defects even when filled from all directions such as upward and sideward as well as downward. That is, the degree of freedom in construction conditions can be increased, and efficient filling construction of the UFC can be realized.

[0061] [Others] Note that the present disclosure is not limited to the above-described embodiment, and can be appropriately modified and implemented without departing from the spirit of the present disclosure.

[0062] For example, in the above embodiment, the UFC is described as an example, but the filling system and the filling method of the present disclosure can be widely applied to various fiber-reinforced cementitious compositions including reinforcing fibers such as steel fibers and synthetic fibers, such as fiber-reinforced mortar and fiber-reinforced grout, or cementitious compositions other than the UFC, such as ordinary concrete.

Description of Reference Numerals

[0063] 10…Filling system, 20…Piping for pressure feeding, 21…Straight pipe, 22…Elbow pipe, 23…Pipe for sensor fixing, 24…Female screw part, 25…Pipe joint, 30…Filling pipe, 40…Formwork, 41…Bottom formwork, 41A…Filling port, 41B…Insertion hole, 42…Upper formwork, 42B…Insertion hole, 43…Formwork with first window, 44…Formwork with second window, 45…Outer plate member, 46…Inner plate member, 46A…Window hole, 47, 48…Intermediate plate member, 49…Shutter plate member, 49B, 49C…Flange part, 50…Shutter valve, 51…Surface plate member, 51A…Through hole, 52…Back plate member, 52A…Through hole, 53, 54…Intermediate plate member, 55…Shutter plate member, 55A…Through hole, 55B, 55C…Flange part, 60…Pipe member, 61…Locking flange part, 70…Mixer device, 80…Pump device, 85…Hopper for pump, 88…Discharge pipe, 90…Pressure sensor for piping, 91…Male screw part, 95…Pressure sensor for formwork, 100…Terminal device, 110…Display device, 120…Operating device, 200…External terminal device

Claims

1. A filling system for a cement-based composition, comprising: a pump device for pumping the cement-based composition; a pumping pipe for circulating the cement-based composition pumped from the pump device; a mold filled with the cement-based composition through a filling port from the pumping pipe; opening / closing means that is in an open state to open the filling port during filling of the cement-based composition and is switched to a closed state to close the filling port when filling of the cement-based composition is completed; a first communication part that communicates a space above one end inside the mold with the outside, and in a communication state where air inside the mold flows out from the first communication part to the outside, when the cement-based composition starts to flow out from the first communication part as the cement-based composition is filled, first communication blocking means that is switched to a blocking state to block the outflow of the cement-based composition from the first communication part; a second communication part that communicates a space above the other end inside the mold with the outside, and in a communication state where air inside the mold flows out from the second communication part to the outside, when the cement-based composition starts to flow out from the second communication part as the cement-based composition is filled, second communication blocking means that is switched to a blocking state to block the outflow of the cement-based composition from the second communication part, characterized by the filling system.

2. The filling system according to claim 1, wherein the first communication blocking means includes a first window part as the first communication part that opens above one end of the mold, and first window opening / closing means capable of opening and closing the first window part; wherein the second communication blocking means includes a second window part as the second communication part that opens above the other end of the mold, and second window opening / closing means capable of opening and closing the second window part. characterized by the filling system.

3. The filling system according to claim 1, when at least one of one end and the other end of the mold is a joint part, the first communication part or the second communication part on the side of the joint part is constituted by a cylindrical pipe member that positions one opening above the end inside the mold and positions the other opening outside the mold. characterized by the filling system.

4. The filling system according to claim 1, further comprising a pressure sensor for measuring the pressure in the pumping pipe and / or the pressure in the mold, and a display device for displaying the measurement result of the pressure sensor. A filling system characterized by the following.

5. A method for filling a cement-based composition using the filling system according to Claim 1, a first step of starting the filling of the cement-based composition into the mold by operating the pump device with the opening / closing means in an open state and the first communication blocking means and the second communication blocking means in a communicating state; a second step of switching to a blocking state the side from which the cement-based composition has started to flow out, out of the first communication blocking means or the second communication blocking means; a third step of temporarily stopping the operation of the pump device when the cement-based composition starts to flow out from the first communication blocking means or the second communication blocking means that has not been switched to the blocking state in the second step; a fourth step of switching the first communication blocking means or the second communication blocking means that has not been switched to the blocking state in the second step to the blocking state and restarting the pump device; a fifth step of stopping the pump device and switching the opening / closing means to a closed state when the pressure in the mold rises to a predetermined pressure due to the restart of the pump device. A filling method characterized by the above.

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