JP6883982B2 - Grout filling method and system - Google Patents

Description

The present invention relates mainly to a grout material filling method and a system applied to a grout material filling operation in an insertion hole into which a shear reinforcing tool is inserted.

When constructing a reinforced concrete structure, shear reinforcements may be placed to support the out-of-plane shear force acting on the walls and the like that make up the structure, but higher shear strength is achieved by reviewing seismic standards. If shear strength is desired, shear reinforcement is required separately for existing reinforced concrete structures.

As a means for performing such shear reinforcement, a seismic retrofitting method using a shear reinforcement tool called "multiple nut bar" (registered trademark) is known.

Such a shear reinforcing tool is composed of a PC steel rod and a disk-shaped or nut-shaped fixing member attached near both ends thereof. For example, when it is installed on the side wall of a box culvert, an insertion hole is inserted in the side wall. After forming a horizontal hole, the insertion hole is filled with a grout material, and then a shear reinforcing tool is inserted so as to be embedded in the grout material.

In this way, after the grout material is solidified, the grout material and the concrete skeleton around it are integrated, so that the inserted shear reinforcing tool acts on the side wall of the box culvert in the above example. It has a function of supporting the out-of-plane shear force or resisting the out-of-plane shear force.

On the other hand, when the part to be seismically reinforced is located above the top plate of the box formwork when viewed from the construction side, an upward insertion hole is formed in the upper part, and then shear reinforcement is performed in the insertion hole. A hollow air bleeding member made of a hose, a pipe, etc. is placed in the insertion hole so that the upper end thereof is located directly below the uppermost part of the insertion hole, and the air bleeding member is inserted. Close the lower end opening of the insertion hole with the bottom formwork.

Next, the grout material is injected upward through the injection port provided in the bottom formwork, but if the grout material flows out from the air bleeding member, it is said that the filling of the insertion hole is completed. Since it can be confirmed, the injection of grout material is finished at this point.

Japanese Unexamined Patent Publication No. 2010-185247 Japanese Unexamined Patent Publication No. 2014-114552 Japanese Unexamined Patent Publication No. 2015-028266

The air bleeding member is indispensable when injecting grout material in that it does not leave air above the insertion hole, but if the grout material is solidified while leaving it, the shear reinforcement will be used. There is a risk that the function will not be fully exhibited.

Therefore, the air bleeding member must be pulled out from the insertion hole before the grout material solidifies, but when the air bleeding member is pulled out, the volume reduction due to the removal does not remain in the insertion hole as a gap. , It is necessary to continue the pressure injection of grout material by the pressure pump, and after removing the air bleeding member, quickly close the air bleeding port of the bottom mold through which it was inserted, and then stop the pressure pump. is there.

However, it is difficult to match the timing of the operation of closing the air bleeding port and the operation of stopping the pressure pump, and if the closing operation is delayed, the grout material flows out from the insertion hole through the air bleeding port and a gap is formed in the insertion hole. Was formed, and when the stop operation of the pressurizing pump was delayed, the pressure of the grout material suddenly increased, causing a problem that the pressurizing pump and the pipes connected to the pressurizing pump were damaged.

The present invention has been made in consideration of the above-mentioned circumstances, and an object of the present invention is to provide a grout material filling method and system capable of preventing damage to a pump or piping without leaving a gap in an insertion hole.

In order to achieve the above object, as described in claim 1, the grout material filling method according to the present invention forms an insertion hole upward in a bedrock, a concrete skeleton or other reinforcement target portion, and then reinforces the insertion hole. Insertion arrangement of means, insertion arrangement of air bleeding member into the insertion hole with the upper end located just below the uppermost part of the insertion hole, and insertion of the air bleeding member into the air bleeding port of the bottom formwork. The bottom mold is installed in the opening of the insertion hole, and then a pressure pump communicated with the injection port of the bottom mold is operated via an injection member to operate the insertion hole. In the grout material filling method of starting the injection of the grout material into the
The tip of the injection member is connected to the injection port.
After starting the injection of the grout material, waiting for the grout material to flow out from the air bleeding member, the air bleeding member or the air bleeding port after the air bleeding member is pulled out is blocked. Then, the outflow of the grout material from the insertion hole is blocked, and then the outflow of the grout material from the insertion hole is blocked by using the injection port or the injection member as a blocking site, and then the pressurizing pump is stopped. Alternatively, while stopping the pressurizing pump and blocking the outflow of grout material from the insertion hole by using the injection port as a blocking site in response to the stop, the injection is performed while the pressurizing pump is operated. When the pressure of the grout material in the member exceeds the set value, the grout material is discharged to the outside of the injection member.

Further, as described in claim 2, the grout material filling system according to the present invention is installed in the opening of the insertion hole formed upward so that the reinforcing means can be inserted and arranged in the bedrock, the concrete skeleton and other parts to be reinforced. A bottom form is provided with an air bleeding port through which an air bleeding member arranged in the insertion hole is inserted so that the upper end is located immediately below the uppermost part of the insertion hole, and the bottom form is provided. In a grout filling system equipped with a pressurizing pump connected to the inlet via an injection member.
The tip of the injection member is connected to the injection port.
Blocking the outflow of grout material from the insertion hole with the air bleeding member or the air bleeding port as a blocking site after the air bleeding member is pulled out, and inserting the grout material with the injection port or the injection member as a blocking site. When the pressure of the grout material in the injection member exceeds the set value due to the outflow blocking of the grout material from the hole, the injection member is provided with a pressure adjusting means capable of discharging the grout material to the outside of the injection member. It is provided in.

Further, the grout material filling system according to the present invention is provided with an air bleeding side blocking means for blocking the outflow of the grout material from the insertion hole with the air bleeding port as a blocking portion.

Further, the grout material filling system according to the present invention is configured to freely advance and retreat between a closed position that closes the air vent and an open position that moves forward or backward from the closed position to open the air vent. A shutter plate on the bleeding side is provided as the air bleeding side blocking means.

Further, the grout material filling system according to the present invention is provided with an injection side blocking means for blocking the outflow of the grout material from the insertion hole with the injection port as a blocking site under the operation of the pressurizing pump.

Further, the grout material filling system according to the present invention is an injection side shutter configured so as to be able to advance and retreat between a closed position for closing the injection port and an open position for moving forward or backward from the closed position to open the injection port. A plate is provided as the injection side blocking means.
Further, as described in claim 7, the grout material filling system according to the present invention is installed in the opening of the insertion hole formed upward so that the reinforcing means can be inserted and arranged in the bedrock, the concrete skeleton and other parts to be reinforced. A bottom form is provided with an air bleeding port through which an air bleeding member arranged in the insertion hole is inserted so that the upper end is located immediately below the uppermost part of the insertion hole, and the bottom form is provided. In a grout filling system equipped with a pressurizing pump connected to the inlet via an injection member.
Blocking the outflow of grout material from the insertion hole with the air bleeding member or the air bleeding port as a blocking site after the air bleeding member is pulled out, and inserting the grout material with the injection port or the injection member as a blocking site. When the pressure of the grout material in the injection member exceeds the set value due to the outflow blocking of the grout material from the hole, the injection member is provided with a pressure adjusting means capable of discharging the grout material to the outside of the injection member. Provided in
An air bleeding side blocking means for blocking the outflow of grout material from the insertion hole is provided with the air bleeding port as a blocking portion.
It consists of a section formed by a notch and a sheet body extending around the section, and the section is opened out of the plane of the sheet body as the air bleeding member is pulled out by inserting the section in a pushed-open manner. Along with the withdrawal of the sheet-like elastic material configured to return from the state to the same flat surface as the sheet body, or the air bleeding member inserted in a form in which an opening is provided and the opening is expanded. A sheet-shaped elastic material configured to return from the expanded state to the contracted state is provided as the air bleeding side blocking means.
Further, the grout material filling system according to the present invention is configured to freely advance and retreat between a closed position that closes the air vent and an open position that moves forward or backward from the closed position to open the air vent. A shutter plate on the bleeding side is provided as the air bleeding side blocking means.

In order to fill the grout material using the grout material filling method and system according to the present invention, first, an insertion hole is formed upward in the bedrock, the concrete skeleton and other parts to be reinforced.

next,
(a) Insertion arrangement of reinforcing means into the insertion hole
(b) Arrangement of inserting the air bleeding member into the insertion hole so that the upper end is located just below the uppermost part of the insertion hole.
(c) The bottom form is installed in the opening of the insertion hole in which the air bleeding member is inserted into the air bleeding port of the bottom form. In this case, the order in which (a) to (c) are performed is arbitrary and may be performed in the above-mentioned order, but after performing (a), (b) and (c) are performed. The bottom formwork to which the air bleeding member is attached may be installed in the opening of the insertion hole at the same time, that is, after the reinforcing means is inserted and arranged, or (a) to (c) are performed at the same time, that is, the reinforcing means. Also, the bottom mold with the air bleeding member attached is lifted and inserted into the insertion hole, and when the upper surface of the bottom mold abuts on the peripheral edge of the opening of the insertion hole, it is fixed to the opening of the insertion hole in that state. It doesn't matter.

Next, by operating a pressure pump communicated with the injection port of the bottom formwork, the grout material is started to be injected into the insertion hole, and after the injection is started, the grout material flows out from the air bleeding member. Waiting for it to come, the outflow of the grout material from the insertion hole is blocked by using the air bleeding member or the air bleeding port after the air bleeding member is pulled out as a blocking portion.

Specific configurations for blocking the air bleeding member as a blocking portion include a configuration in which the air bleeding member is bent or sandwiched when it has flexibility.

Next, the pressure pump is stopped after blocking the outflow of the grout material from the insertion hole by using the injection port or the injection member as a blocking site (hereinafter referred to as "preceding shutoff"), or the pressure pump is stopped. In response to the stop, the injection port is used as a blocking site to block the outflow of the grout material from the insertion hole (hereinafter, referred to as simultaneous blocking).

Specific configurations for blocking the injection member as a blocking site include a configuration in which the injection member is bent or sandwiched when it has flexibility.

Here, the pressurizing pump starts injecting the grout material into the insertion hole by starting, completes filling of the grout material into the insertion hole, blocks the outflow of the grout material on the air vent side, and then on the injection port side. If the pressure of the grout material in the injection member exceeds the set value during the continuous operation without interruption until the stop after the preceding shutoff or the stop at the simultaneous shutoff, then The grout material is discharged to the outside of the injection member.

In this way, even if the pressure of the grout material rises in the injection member due to the shutoff on the air vent side or the advance shutoff on the injection port side, the size may exceed the set value and become excessive. Thus, it is possible to prevent the injection member and the pressure pump from being damaged or falling off at the connection point of the injection member.

On the other hand, when the air vent side is shut off or the inlet side is shut off in advance, the pressurizing pump operates continuously without being stopped, so that the grout material filled in the insertion hole is before shutting off. There is no outflow through the air vent or inlet and no voids are created in the insertion hole.

The part to be reinforced mainly corresponds to the concrete skeleton, especially the reinforced concrete skeleton, and the reinforcing means in that case includes a shear reinforcing member such as a shear reinforcing bar and a shear reinforcing tool represented by "multiple nut bar" (registered trademark). However, as long as the reinforcing means is inserted into the insertion hole formed upward and the grout material is filled in that state, the combination of the reinforcement target part and the reinforcing means is arbitrary, for example, rock mass. It is also possible to construct a ground such as a rock bolt or an anchor buried in the ground.

The insertion hole formed upward is the subject of the present invention, but upward does not mean only vertically upward, and when there is a risk of air remaining when the grout material is injected, that is, the opening position. It shall mean the case where the hole bottom position is higher than that.

The air bleeding member can be composed of a hose, a pipe, or the like, and the material of the air bleeding member does not matter when it is pulled out and removed. The injection member can also be composed of a hose, a pipe, or the like.

The bottom formwork can be installed at the site to be reinforced with its upper surface in contact with the peripheral edge of the opening of the insertion hole, and if necessary, the bottom formwork can be installed while adjusting the unevenness at the peripheral edge of the opening of the insertion hole. Any configuration may be used as long as the liquidtightness at the contact point can be ensured.

The pressure adjusting means discharges the grout material to the outside of the injection member only when the pressure of the grout material in the injection member exceeds the set value, and when the pressure returns to the set value or less, the grout material is released. It is assumed that the pressure is applied to the injection port again, and can be configured by, for example, a relief valve.

In the grout material filling system according to the present invention, how to shut off the air bleeding port side and the preceding shutoff on the injection port side is arbitrary, and a flexible air bleeding member may be bent or sandwiched. By doing so, the air bleeding member can be blocked as a blocking site, or the injecting member can be blocked as a blocking site by bending or sandwiching the flexible injection member. Equipped with an air bleeding side blocking means that blocks the outflow of grout material from the insertion hole with the mouth as the blocking site, or blocks the outflow of grout material from the insertion hole with the injection port as the blocking site under the operation of the pressurizing pump. If the injection side blocking means is provided, a more reliable and quick blocking operation becomes possible.

The structure of the air bleeding side blocking means is arbitrary as long as it can block the outflow of the grout material from the insertion hole through the air bleeding port. The sheet-shaped elastic material is made of a sheet-shaped elastic material, and the section is opened out of the plane of the sheet body as the air bleeding member is pulled out by inserting the sheet-shaped elastic material in a form in which the section is pushed open. It is configured to return to the same flat surface as the sheet body, or is composed of a sheet-shaped elastic material provided with an opening, and the sheet-shaped elastic material is inserted in a form in which the opening is expanded. If the opening is configured to return from the expanded state to the contracted state when the air bleeding member is pulled out, the outflow of the grout material due to the pulling out of the air bleeding member can be prevented at the same time as the pulling operation. It is no longer necessary to separately receive the grout material that has flowed out through the air vent with a bucket or the like.

The section is not necessarily cut as long as the adjacent portion is elastically deformed by making a cut and pushed open toward the insertion hole, and the cut opening creates an insertion space for the air bleeding member at the cut portion. It is not limited to cases where the shape is U-shaped, cross-shaped, C-shaped, etc., and the outline of the section formed by the cut is a surrounding shape such as a rectangular shape, a triangular shape (fan shape), or a semicircular shape. However, even if the incision is straight, even if the adjacent site acts as described above, the adjacent site shall be included as an intercept.

Here, in each of the above-mentioned sheet-shaped elastic materials, it is assumed that the grout material leaks through the notch or the opening, but if the leakage speed is small, the air vent may be used as necessary. It is possible to avoid the situation where a gap is generated in the insertion hole by appropriately taking known water stopping measures such as attaching a water stopping tape.

On the other hand, if the leakage rate of the grout material through the notch or opening, especially the opening, is high and there is a risk that a gap may be generated in the insertion hole, instead of each sheet-like elastic material described above, or each sheet-like material. In addition to the elastic material, the air bleeding side shutter plate is configured so that it can move forward and backward between the closed position that closes the air bleeding port and the open position that moves forward or backward from the closed position to open the air bleeding port. It may be provided as a blocking means.

By doing so, after operating the shutter plate on the air bleeding side, it is possible to surely prevent the grout material from flowing out from the insertion hole through the air bleeding port, and the above-mentioned sheet-shaped elastic materials are used together. In this case, the outflow of the grout material due to the withdrawal of the air bleeding member can be reduced to some extent at the same time as the withdrawal operation, so that the time and effort for receiving the outflow of the grout material through the air bleeding port is simplified and It is also possible to operate the shutter plate on the air bleeding side after that with a margin of time.

The structure of the injection side blocking means is arbitrary as long as it can block the outflow of grout material from the insertion hole through the injection port. It is possible to provide an injection-side shutter plate, which is configured so as to be able to advance and retreat from the open position where the injection port is opened, as an injection-side blocking means.

The schematic diagram of the grout material filling system 1 which concerns on this embodiment. It is the figure which showed the bottom formwork 2, (a) is the whole exploded perspective view, (b) is the whole perspective view. The explanatory view which showed the procedure of the grout material filling method which concerns on this embodiment. It is a figure which showed the modification which provided the sheet-like elastic material 41 instead of the air bleeding side shutter plate 26, (a) is the whole disassembled perspective view, and (b)-(d) are explanations which showed the action. Figure. The perspective view which showed the action which concerns on the modification of the sheet-shaped elastic material 41. Similarly, the perspective view which showed the action which concerns on the modification of the sheet-shaped elastic material 41. Similarly, the perspective view which showed the action which concerns on the modification of the sheet-shaped elastic material 41. It is a figure which showed the modification which showed the air bleeding side shutter plate 26 and the sheet-like elastic material 41 side by side, (a) is the whole disassembled perspective view, and (b)-(e) are explanatory views which showed the action. The schematic diagram which showed the modification of the grout material filling system which concerns on this embodiment. It is the figure which showed the modification about the simultaneous shut-off on the inlet side, (a) is the whole disassembled perspective view, and (b)-(d) are explanatory views which showed the action.

Hereinafter, embodiments of the grout material filling method and the system according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a schematic view showing a grout material filling system according to the present embodiment. As shown in the figure, the grout material filling system 1 according to the present embodiment is applied to seismic retrofitting with the reinforced concrete skeleton 6 as a reinforcement target portion, and is formed substantially vertically upward on the reinforced concrete skeleton. A bottom mold 2 installed in the opening 8 of the insertion hole 7 and a pressurizing pump 5 communicated with and connected to an injection port 3 provided in the bottom mold via an injection pipe 4 as an injection member. In the state where the shear reinforcing tool 9 which is a reinforcing means is inserted and arranged in the insertion hole 7, the mortar as a grout material which has been pumped from the pressurizing pump 5 along the injection pipe 4 is inserted from the injection port 3 into the insertion hole. By injecting into 7, the shear reinforcing tool 9 is integrated with the reinforced concrete skeleton 6 via the mortar filled in the insertion hole, and the reinforced concrete skeleton can be retrofitted by shearing.

As shown in the figure, for example, the shear reinforcing tool 9 may be composed of a rod-shaped PC steel rod and a pair of fixing nuts screwed to each end of the PC steel rod.

The bottom mold 2 is provided with an air bleeding port 11 along with the injection port 3, and the air bleeding member 10 is inserted into the air bleeding port so that the upper end is located directly below the uppermost portion of the insertion hole 7. When the mortar is pressure-injected, the air in the insertion hole 7 is expelled from the insertion hole through the air bleeding member 10, and when the mortar flows out from the lower end of the air bleeding member 10, the uppermost portion of the insertion hole 7 is formed. It is possible to confirm that the mortar has been injected to just below, that is, that the mortar has been injected into every corner without leaving a gap in the insertion hole 7.

The air bleeding member 10 may be made of, for example, a resin pipe or hose.

Here, in the bottom mold 2, the mortar flows out from the insertion hole 7 through the air bleeding port after the air bleeding member 10 is pulled out from the air bleeding port 11, and from the insertion hole 7 through the injection port 3. The injection pipe 4 is provided with a relief valve 13 as a pressure adjusting means, and the pressure of the mortar in the injection pipe 4 is set in the relief valve. When the value is exceeded, a part of the mortar is discharged to the outside of the injection pipe 4 and returned to the hopper 12 connected to the supply side of the pressurizing pump 5, and the pressure of the mortar in the injection pipe 4 is increased. When the value returns to the set value or less, the entire amount of the mortar is pumped back toward the injection port 3.

FIG. 2 is an overall disassembled perspective view and an overall perspective view showing the bottom form 2. As can be seen from these figures, the bottom form 2 is the same as the lower plate 22 in which the connection port 28 to which the injection pipe 4 is connected is projected downward, the injection side shutter plate 24, and the injection side shutter plate. Two injection-side guide plates 23a and 23b arranged on each longitudinal side of the injection-side shutter plate so as to be in-plane, and an upper plate 21 having two circular openings 27 and 29 formed on the injection side. The shutter plate 24 and the two injection side guide plates 23a and 23b are laminated so as to be sandwiched between the lower plate 22 and the upper plate 21, and the air bleeding side guide plate 25 is arranged on the lower surface of the lower plate 22. Then, the circular opening 27 of the upper plate 21 and the connection port 28 of the lower plate 22 are concentric with each other, and are formed in the circular opening 29 of the upper plate 21, the circular opening 30 formed in the injection side guide plate 23a, and the lower plate 22. The circular opening 31 and the circular opening 32 formed in the air bleeding side guide plate 25 are positioned so as to be concentric with each other, and then the bolt holes 33a and 33a formed in the air bleeding side guide plate 25 and the lower plate 22 are formed. The bolts 37a and 37a are inserted into the formed bolt holes 34a and 34a and the bolt holes 35a and 35a formed in the injection side guide plate 23a and screwed into the bolt holes 36a and 36a of the upper plate 21 and the lower plate. The bolts 37b and 37b are inserted into the bolt holes 34b and 34b formed in 22 and the bolt holes 35b and 35b formed in the injection side guide plate 23b and screwed into the bolt holes 36b and 36b of the upper plate 21 to each other. It is connected.

Here, the circular opening 27 of the upper plate 21 and the connection port 28 of the lower plate 22 constitute the above-mentioned injection port 3, the circular opening 29 of the upper plate 21, the circular opening 30 provided in the injection side guide plate 23a, and the lower stage. The circular opening 31 provided in the plate 22 and the circular opening 32 provided in the air bleeding side guide plate 25 constitute the above-mentioned air bleeding port 11.

The air bleeding side guide plate 25 is configured by extending a folded portion at each longitudinal side edge portion of the groove-shaped recess, and the above-mentioned circular opening 32 is formed at the bottom of the groove-shaped recess. The above-mentioned bolt holes 33a are formed in the above-mentioned holes 33a, respectively, but a T-shaped air bleeding side is provided in the insertion space formed between the groove-shaped recess and the lower surface of the lower plate 22 arranged on the opening side thereof. The shutter plate 26 can be inserted.

The air bleeding side shutter plate 26 is guided along the direction of the arrow in the figure by the air bleeding side guide plate 25, and the closed position (one-dot chain line in the figure) and the closed position that close the air bleeding port 11 at the portion near the tip thereof 38. It is configured so that it can move back and forth from the opening position (solid line in the figure) to open the air bleeding port 11 by retreating to the right in the figure, and at the closed position, from the insertion hole 7 through the air bleeding port 11. It functions as an air bleeding side blocking means for blocking the outflow of mortar.

On the other hand, the injection side shutter plate 24 is sandwiched between the injection side guide plates 23a and 23b arranged on the longitudinal side thereof, respectively, and while being guided by the injection side guide plate along the direction of the arrow in the figure, the injection side. The circular opening 33 formed in the shutter plate is displaced from the injection port 3 as a whole to close the injection port (one-dot chain line in the figure) and moves to the left side in the same figure from the closing position (from the left side). Since the circular opening 33 is concentric with the injection port 3 (retracts when viewed), it is configured to be able to move forward and backward from the open position (solid line in the figure) in which the injection port is opened. It functions as an injection side blocking means for blocking the outflow of mortar from the insertion hole 7 through 3.

The injection-side shutter plate 24 has bent portions 39a and 39b provided on the short side edges thereof in contact with the opposite edges of the lower plate 22, so that the injection-side guide plates 23a and 23b can be squeezed from between the injection-side guide plates 23a and 23b. Alternatively, it is designed to prevent slipping out or falling out from between the upper plate 21 and the lower plate 22, but it moves to the left side of the figure and the bent portion 39a is located at a position where the circular opening 33 is concentric with the injection port 3. Is in contact with the edge of the lower plate 22, and is configured so that the bent portion 39b abuts on the edge of the lower plate 22 at a position where the circular opening 33 moves to the right side of the figure and the circular opening 33 is totally removed from the injection port 3. Since the bent portions 39a and 39b function as stoppers, respectively, it is possible to easily switch between the opening operation and the blocking operation at the injection port 3.

Bolt holes 40 are formed at each of the four corners of the upper plate 21, and the bottom formwork 2 can be fixed to the reinforced concrete skeleton 6 by using bolts (not shown) inserted through the bolt holes. In addition, notches are formed at each of the four corners of the lower plate 22 so as not to interfere with the fixing work.

In order to fill the insertion hole 7 with mortar using the grout material filling system 1 according to the present embodiment, first, the insertion hole 7 is formed upward in the reinforced concrete skeleton 6.

Next, the insertion arrangement of the shear reinforcing tool 9 into the insertion hole 7, the insertion arrangement of the air bleeding member 10 into the insertion hole with the upper end located directly below the uppermost portion of the insertion hole 7, and the bottom of the air bleeding member 10. The bottom mold is installed in the opening of the insertion hole 7 in the form of being inserted into the air vent 11 of the mold 2 in an arbitrary order.

Specifically, for example, after the shear reinforcing tool 9 is inserted into the insertion hole 7 and temporarily fixed, the air bleeding member 10 is first attached to the bottom formwork 2, and then the bottom formwork 2 is lifted and attached to the bottom formwork 2. When the air bleeding member 10 is inserted into the insertion hole 7 and the upper surface of the bottom formwork comes into contact with the opening peripheral edge of the insertion hole 7, bolts are formed in the bolt holes 40 formed at the four corners of the upper plate 21 in that state. The bottom formwork 2 may be installed in the opening of the insertion hole 7 by inserting the formwork and fixing the tip thereof to the reinforced concrete skeleton 6.

Next, by operating the pressurizing pump 5 communicated with the injection port 3 of the bottom form 2, as shown in FIG. 3A, injection of mortar into the insertion hole 7 is started, and the injection is started. After the start, wait for the mortar to flow out from the air bleeding member 10 (Fig. (B)), and then pull out the air bleeding member from the air bleeding port 11 (Fig. (C)).

Here, the pressurizing pump 5 has been continuously operating during and after the drawing of the air bleeding member 10 since the start of injecting the mortar into the insertion hole 7 by the start, and the pressurizing pump 5 is inserted into the insertion hole 7. Even if the air bleeding member 10 is pulled out, the amount of mortar corresponding to the volume reduction is promptly replenished by the pressurizing pump 5, and there is no possibility that a gap is formed in the insertion hole 7. After the air bleeding member 10 is pulled out, the mortar flows out from the air bleeding port 11, and the mortar may be temporarily received by a bucket or the like as necessary.

Next, the air bleeding side shutter plate 26 is advanced to the closed position, and the air bleeding port 11 is closed at the portion near the tip thereof to block the outflow of the mortar from the insertion hole 7 through the air bleeding port.

In this way, the pressure of the mortar in the injection pipe 4 rises, but when this value exceeds the set value of the relief valve 13, the relief valve operates and the mortar flowing through the injection pipe 4 A part is discharged to the outside and returns to the hopper 12 (Fig. (D)).

On the other hand, since the pressurizing pump 5 is continuously operating without being stopped, the pressurizing action by the pressurizing pump extends to the insertion hole 7 through the injection port 3. Therefore, there is no possibility that the filled mortar will flow out from the injection port before the injection port 3 is shut off, which is the next step, and a gap will be formed in the insertion hole 7.

Next, the injection side shutter plate 24 is moved back and forth to the closed position by hitting the bent portion 39b with, for example, a hammer (forward when viewed from the left side in FIG. 2 and backward when viewed from the right side), and the circular opening 33 is noted. By shifting from the inlet 3 as a whole, the outflow of mortar from the insertion hole 7 through the injection port 3 is blocked (preceding blocking).

In this way, the mortar in the injection pipe 4 is still maintained in a high pressure state, but the relief valve 13 discharges a part of the mortar flowing through the injection pipe 4 to the outside and returns to the hopper 12. (Fig. 3 (e)).

After advancing and retreating the injection side shutter plate 24 to the closed position, the pressurizing pump 5 is stopped at an appropriate timing.

As described above, according to the grout material filling system 1 and the grout material filling method using the grout material filling system 1 according to the present embodiment, the pressure of the mortar is applied to the injection pipe by shutting off the air vent 11 and the preceding shutoff of the injection port 3. Even if it rises within 4, there is no possibility that its size will exceed the set value and become excessive due to the action of the relief valve 13, and thus damage to the injection pipe 4 and the pressurizing pump 5 can be prevented. it can.

On the other hand, when the air bleeding port 11 is shut off or the injection port 3 is shut off in advance, the pressurizing pump 5 operates continuously without being stopped, so that the mortar filled in the insertion hole 7 is before shutting off. There is no possibility that the air will flow out from the air vent 11 or the injection port 3 and a gap will be generated in the insertion hole 7.

Further, according to the grout material filling system 1 according to the present embodiment, the air bleeding side shutter plate 26 capable of closing the air bleeding port 11 is provided, and the injection side shutter plate 24 capable of closing the injection port 3 is provided. Therefore, the outflow of mortar from the insertion hole 7 through the air bleeding port 11 and the injection port 3 can be quickly and surely blocked.

In the present embodiment, the case where the grout material is mortar is taken as an example, but other hydraulic materials can be used instead of the mortar, and chemical solutions and various other grout materials can also be used.

Further, in the present embodiment, the air bleeding side shutter plate 26 of the present invention is configured, but instead of the air bleeding side shutter plate, as shown in FIG. 4, an air bleeding port 11 is used. The sheet-shaped elastic material 41 may be used to block the outflow of the mortar from the inserted hole 7 as the air bleeding member 10 is pulled out.

In the modified example shown in the figure, the air bleeding side shutter plate 26 and the air bleeding side guide plate 25 for guiding the advancing / retreating operation thereof are omitted from the configuration of the above-described embodiment described in FIG. 2, while the upper surface of the upper plate 21 is omitted. It is constructed by attaching a sheet-shaped elastic material 41 to the surface.

The sheet-shaped elastic material 41 is composed of a section 43 formed in a rectangular shape by a U-shaped notch and a sheet body 44 extending around the section 43, and a bottom form 2 is provided at four corners of the sheet body. Bolt holes 40a through which bolts (not shown) for fixing to the reinforced concrete skeleton 6 can be inserted are formed so as to be concentric with the bolt holes 40 of the upper plate 21, and the circular opening 27 and the connection port 28 are formed. In addition, circular openings 42 constituting the injection port 3 are provided so as to be concentric with them.

Here, the sheet-shaped elastic material 41 is configured so that the section 43 returns from the state in which the section 43 is opened out of the plane of the sheet body 44 to the state in which it becomes the same plane as the sheet body as the air bleeding member 10 is pulled out. When the pressure injection of the mortar is started, the section 43 is pushed open toward the insertion hole 7 by the air bleeding member 10 inserted through the air bleeding port 11 as shown in FIG. However, when the air bleeding member 10 is pulled out, the intercept 43 responds to the pulling operation by the elastic restoring force and the pressurizing action of the mortar as shown in FIG. It returns to the state where it becomes the same plane as 44. By the way, even if the section 43 is subjected to the pressurizing action of the mortar, its force is generally supported by the upper plate 21, so that there is no possibility that the section 43 will be pushed open to the opposite side.

During this time, on the injection side, the shutter plate 24 on the injection side was moved back and forth to the open position so that the mortar could be injected under pressure ((b) and (c) in the figure), and the air bleeding member 10 was pulled out. After that, as shown in FIG. 3D, the injection side shutter plate 24 is moved back and forth to the closed position to block the injection port 3 and prevent the mortar from flowing out from the insertion hole 7 through the injection port. ..

According to such a configuration, the outflow of mortar accompanying the withdrawal of the air bleeding member 10 can be prevented at the same time as the withdrawal operation, so that it is not necessary to separately receive the mortar that has flowed out through the air bleeding port 11 with a bucket or the like.

If there is a concern that the mortar slightly leaks through the U-shaped notch that separates the section 43 and the sheet body 44 around it, the air bleeding member 10 is pulled out and removed, and then the air bleeding port 11 A known water blocking measure may be appropriately taken, such as attaching a water blocking tape to the circular opening 31 of the lower plate 22, which is one of the above.

In the above-mentioned modification, the section 43 formed into a rectangular shape by the U-shaped notch is used as the section of the present invention, but the way of making the notch and the shape formed by the cut are arbitrary, for example, radial. You may make a notch in. In this case, the section is composed of a plurality of pieces having a triangular shape or a fan shape. FIG. 5 shows an example in which a section 43a composed of four pieces is formed by making a cross-shaped cut, and FIG. 6 shows an example in which a section 43b consisting of two pieces is formed by making a cut in a straight line. It is.

Further, instead of the sheet-shaped elastic material 41, the sheet-shaped elastic material 71 may be attached to the upper surface of the upper plate 21 as shown in FIG.

The sheet-shaped elastic material 71 is configured to be provided with an opening 72 that returns from the expanded state to the contracted state when the inserted air bleeding member 10 is pulled out, and the bottom form 2 is formed in a reinforced concrete skeleton at four corners. Bolt holes 40a through which bolts for fixing to 6 (not shown) are inserted are formed so as to be concentric with the bolt holes 40 of the upper plate 21, and are noted together with the circular opening 27 and the connection port 28. Circular openings 42 constituting the entrance 3 are provided so as to be concentric with them.

Here, in the situation where the sheet-shaped elastic material 71 is pressure-injected with mortar, the opening 72 is expanded by inserting the air bleeding member 10 as shown in FIG. However, after the air bleeding member 10 is pulled out, the opening 72 returns to the contracted state by its elastic restoring force and the pressurizing action of the mortar in response to the pulling operation as shown in FIG.

Hereinafter, other actions relating to the sheet-shaped elastic material 71 are substantially the same as those of the sheet-shaped elastic material 41, and thus the description thereof will be omitted here.

In the above-described modification, the air bleeding side blocking means of the present invention is composed of a sheet-shaped elastic material 41 or a sheet-shaped elastic material 71 instead of the air bleeding side shutter plate 26. If there is a concern that mortar that causes a gap in the insertion hole 7 leaks through the insertion hole 7, the sheet-shaped elastic material 41 or the sheet-shaped elastic material 71 and the air bleeding side shutter plate 26 may be used in combination. ..

FIG. 8A is configured by attaching the sheet-shaped elastic material 41 to the upper surface of the upper plate 21 in addition to the configuration of the above-described embodiment described with reference to FIG.

In such a modified example, when the pressure injection of the mortar is started, the section 43 is pushed toward the insertion hole 7 by the air bleeding member 10 inserted through the air bleeding port 11 as shown in FIG. Although it is in an open state, when the air bleeding member 10 is pulled out, the section 43 responds to the pulling operation by its elastic restoring force and the pressurizing action of the mortar, as shown in FIG. The state returns to the same flat surface as the seat body 44.

Next, as shown in FIG. 3D, the air bleeding side shutter plate 26 is advanced to the closed position, and the air bleeding port 11 is closed at the portion near the tip thereof, so that the insertion hole is inserted through the air bleeding port 11. Block the outflow of mortar from 7.

In this way, the amount of mortar flowing out from the air bleeding port 11 after the air bleeding member 10 is pulled out and removed can be reduced by the sheet-shaped elastic material 41, so that the mortar flowing out through the air bleeding port 11 can be reduced. The mortar can be reliably prevented from flowing out from the air bleeding port 11 by the subsequent shut-off operation by the air bleeding side shutter plate 26.

During this period, on the injection side, the injection side shutter plate 24 is moved back and forth to the open position so that continuous pressure injection of mortar is performed (FIGS. (B) to (d)), and the air bleeding side shutter plate 26 After performing the shutoff operation of the air bleeding port 11 by the above method, the injection port 3 is shut off by moving the injection side shutter plate 24 back and forth to the closed position as shown in FIG. Prevents the mortar from flowing out from the insertion hole 7.

Further, in the present embodiment and its modified example, the air bleeding side shutter plate 26, the sheet-shaped elastic material 41, or the sheet-shaped elastic material 71 is provided as the air bleeding side blocking means, but the air bleeding member 10 is not pulled out. If the mortar is blocked from flowing out through the air bleeding member 10 by bending or sandwiching the air bleeding member, the above-mentioned air bleeding side blocking means may be omitted. It doesn't matter. Similarly, in the present embodiment, the injection side shutter plate 24 is provided as the injection side blocking means, but an injection hose as an injection member is interposed between the injection pipe 4 and the injection port 3, and the injection side shutter plate 24 is provided. If the outflow of mortar through the injection hose is blocked by bending or sandwiching the injection hose, the above-mentioned injection side blocking means may be omitted.

FIG. 9 is a schematic view of a mortar material filling system showing such a modified example, in which both the air bleeding side blocking means and the injection side blocking means are omitted from the above-described embodiment, and the reinforced concrete skeleton 6 is substantially vertical. It is inserted through a bottom mold 81 installed in the opening 8 of the insertion hole 7 formed upward and an air vent 11 provided in the bottom mold so that the upper end is located directly below the uppermost portion of the insertion hole 7. An air bleeding member 10, an injection hose 82 as an injection member connected to an injection port 3 provided in the bottom mold 81, an injection pipe 4 having one end connected to the injection hose, and the like. A pressurizing pump 5 connected to the other end of the injection pipe is provided, and the shear reinforcing tool 9 is inserted and arranged in the insertion hole 7 from the pressurizing pump 5 along the injection pipe 4 and the injection hose 82. By injecting the mortar pumped into the insertion hole 7 from the injection port 3, the shear reinforcing tool 9 is integrated with the reinforced concrete skeleton 6 via the mortar filled in the insertion hole, and the reinforced concrete skeleton is shear-reinforced. A relief valve 13 is provided in the injection pipe 4, and the relief valve uses a part of the mortar when the pressure of the mortar in the injection pipe 4 exceeds a set value. When the pressure of the mortar in the injection pipe 4 returns to the set value or less while being discharged to the outside of the injection pipe 4 and returned to the hopper 12 connected to the supply side of the pressurizing pump 5, the mortar of the mortar The entire amount is pumped back toward the injection port 3.

In the modified example shown in FIG. 3A, the mortar is waited for to flow out from the air bleeding member 10, the air bleeding member is bent to block the internal flow path (Fig. 3B), and then the air bleeding member is blocked. , As shown in FIG. 6C, the injection hose 82 is bent to block its internal flow path.

Even in such a configuration, the pressure of the mortar may increase in the injection pipe 4 due to the interruption of the air bleeding member 10 and the injection hose 82. At that time, the relief valve 13 causes the injection pipe 4 and the pressure pump 5 to increase. Since the pressure pump 5 operates continuously without being stopped when the air bleeding member 10 and the injection hose 82 are shut off, the insertion hole 7 has been filled. Similar to the above-described embodiment, the mortar does not flow out from the air bleeding member 10 or the injection hose 82 before shutting off, and a gap is not generated in the insertion hole 7.

Further, in the present embodiment, the outflow blocking of the grout material from the insertion hole on the injection port side is performed by the preceding blocking, but in the present invention, the preceding blocking is not always necessary, and the simultaneous blocking, that is, pressurization is performed. The pump may be stopped and the inflow port may be used as a blocking site to block the outflow of the grout material from the insertion hole in response to the stopping.

In this case, the pressure of the mortar does not increase in the injection member due to the cutoff on the injection port side, but there is no difference in the pressure of the mortar increasing in the injection member due to the cutoff on the air vent side. It has the same effect as that of the embodiment of.

FIG. 10 shows the configuration of such a modification, and shows the air bleeding side shutter plate 26, the air bleeding side guide plate 25 for guiding the advancing / retreating operation thereof, and the air bleeding side guide plate 25 from the configuration of the above-described embodiment described in FIG. The injection-side shutter plate 24 and the injection-side guide plates 23a and 23b that guide the advancing / retreating operation are omitted, and the injection-side shutter plate and the injection-side guide plate do not need to be sandwiched between the lower-stage plate 22 and the upper-stage plate 21. On the other hand, the sheet-shaped elastic material 91 is attached to the upper surface of the mold plate 22a instead of the lower plate 22.

The mold plate 22a has almost the same configuration as the lower plate except that the four corners of the lower plate 22 are not cut out, and the connection port 28 to which the injection pipe 4 is connected is the injection port. As well as protruding downward, a circular opening 31a as an air vent is formed.

The sheet-shaped elastic material 91 is composed of a section 43 formed by a U-shaped notch, a section 92 also formed by a U-shaped notch, and a sheet body 93 extending around them. At each corner, bolt holes 40a through which bolts (not shown) for fixing the formwork plate 22a to the reinforced concrete skeleton 6 can be inserted are formed so as to be concentric with the bolt holes of the formwork plate. There is.

Here, the sheet-shaped elastic material 91 is configured so that the section 43 returns from the state in which the section 43 is opened out of the plane of the sheet body 93 to a state in which it becomes the same flat surface as the sheet body 93 as the air bleeding member 10 is pulled out. As a result, it functions as an air bleeding side shutoff means, and after the pressurizing pump 5 is stopped, the section 92 changes from the state of being opened out of the surface of the sheet body 93 to the state of being on the same plane as the sheet body. It is configured to recover, and is configured to be capable of simultaneous shutoff as described above.

That is, at the time when the pressure injection of the mortar is started, as shown in FIG. 3B, the section 43 is pushed open toward the insertion hole 7 by the air bleeding member 10 inserted through the air bleeding port 11. However, when the air bleeding member 10 is pulled out, as shown in FIG. It returns to the same plane. By the way, even if the section 43 is subjected to the pressure action of the mortar, its force is generally supported by the mold plate 22a, so that there is no possibility that the section 43 will be pushed open to the opposite side.

During this period, on the injection side, as shown in FIGS. (B) and (c), the section 92 is pushed open toward the insertion hole 7 by the injection pressure of the mortar, but the air bleeding member 10 After the pressurizing pump 5 is stopped after the pull-out operation, the section functions as a check valve that allows only the flow in the direction from the connecting port 28, which is the injection port, toward the insertion hole 7, and the pressurizing pump 5 As shown in FIG. 3D in response to the stoppage of the mortar, the elastic restoring force and the weight of the mortar return to the same plane as the seat body 93, and the connection port 28, which is an injection port, is blocked. The outflow of mortar from the insertion hole 7 through the injection port is prevented.

1 Grout material filling system 2 Bottom formwork 3 Injection port 4 Injection piping (injection member)
5 Pressurized pump 6 Reinforced concrete skeleton (part to be reinforced)
7 Insertion hole 9 Shear reinforcement tool (reinforcing means)
10 Air bleeding member 11 Air bleeding port 13 Relief valve (pressure adjusting means)
21 Upper plate 22 Lower plates 23a, 23b Injection side guide plate 24 Injection side shutter plate (injection side blocking means)
25 Air bleeding side guide plate 26 Air bleeding side shutter plate (air bleeding side shutoff means)
27 Circular opening (injection port)
28 Connection port (injection port)
29, 30, 31, 32
Circular opening (air vent)
41 Sheet-shaped elastic material (air bleeding side blocking means)
42 Circular opening (injection port)
43 Section 44 Sheet body 71 Sheet-like elastic material 81 Bottom formwork 82 Injection hose (injection member)

Claims (8)

Insertion holes are formed upward in the bedrock, concrete skeleton and other parts to be reinforced, then the insertion arrangement of the reinforcing means into the insertion holes, and the insertion holes in the form in which the upper end is located just below the uppermost portion of the insertion holes. The insertion arrangement of the air bleeding member and the installation of the bottom mold in the opening of the insertion hole in the form in which the air bleeding member is inserted into the air bleeding port of the bottom mold are performed, and then the bottom mold is installed. In the grout material filling method in which the injection of the grout material into the insertion hole is started by operating the pressurizing pump which is continuously connected to the injection port via the injection member.
The tip of the injection member is connected to the injection port.
After starting the injection of the grout material, waiting for the grout material to flow out from the air bleeding member, the air bleeding member or the air bleeding port after the air bleeding member is pulled out is blocked. Then, the outflow of the grout material from the insertion hole is blocked, and then the outflow of the grout material from the insertion hole is blocked by using the injection port or the injection member as a blocking site, and then the pressurizing pump is stopped. Alternatively, while stopping the pressurizing pump and blocking the outflow of the grout material from the insertion hole by using the injection port as a blocking site in response to the stop, the injection is performed while the pressurizing pump is operated. A method for filling a grout material, which comprises discharging the grout material to the outside of the injection member when the pressure of the grout material in the member exceeds a set value. It is installed in the opening of the insertion hole formed upward so that the reinforcing means can be inserted and placed in the bedrock, concrete formwork and other parts to be reinforced, and placed in the insertion hole so that the upper end is located just below the uppermost part of the insertion hole. It is provided with a bottom mold provided with an air bleeding port through which the air bleeding member to be inserted is inserted, and a pressurizing pump communicated with and connected to an injection port provided in the bottom mold via an injection member. In the grout filling system
The tip of the injection member is connected to the injection port.
Blocking the outflow of grout material from the insertion hole with the air bleeding member or the air bleeding port as a blocking site after the air bleeding member is pulled out, and inserting the grout material with the injection port or the injection member as a blocking site. When the pressure of the grout material in the injection member exceeds the set value due to the outflow blocking of the grout material from the hole, the injection member is provided with a pressure adjusting means capable of discharging the grout material to the outside of the injection member. A grout material filling system characterized by being installed in. The grout material filling system according to claim 2, further comprising an air bleeding side blocking means for blocking the outflow of the grout material from the insertion hole with the air bleeding port as a blocking portion. An air bleeding side shutter plate formed so as to be able to advance and retreat between a closed position that closes the air bleeding port and an open position that moves forward or backward from the closed position and opens the air bleeding port is used as the air bleeding side shutoff means. The grout material filling system according to claim 3. The grout material filling system according to claim 2 or 3, further comprising an injection-side blocking means for blocking the outflow of grout material from the insertion hole with the injection port as a blocking site under the operation of the pressure pump. A claim that includes an injection-side shutter plate as the injection-side blocking means, which is configured to be able to move forward and backward between a closed position that closes the injection port and an open position that moves forward or backward from the closed position and opens the injection port. 5. The grout material filling system according to 5. It is installed in the opening of the insertion hole formed upward so that the reinforcing means can be inserted and placed in the bedrock, concrete formwork and other parts to be reinforced, and placed in the insertion hole so that the upper end is located just below the uppermost part of the insertion hole. It is provided with a bottom mold provided with an air bleeding port through which the air bleeding member to be inserted is inserted, and a pressurizing pump communicated with and connected to an injection port provided in the bottom mold via an injection member. In the grout filling system
Blocking the outflow of grout material from the insertion hole with the air bleeding member or the air bleeding port as a blocking site after the air bleeding member is pulled out, and inserting the grout material with the injection port or the injection member as a blocking site. When the pressure of the grout material in the injection member exceeds the set value due to the outflow blocking of the grout material from the hole, the injection member is provided with a pressure adjusting means capable of discharging the grout material to the outside of the injection member. Provided in
An air bleeding side blocking means for blocking the outflow of grout material from the insertion hole is provided with the air bleeding port as a blocking portion.
It consists of a section formed by a notch and a sheet body extending around the section, and the section is opened out of the plane of the sheet body as the air bleeding member is pulled out by inserting the section in a pushed-open manner. Along with the withdrawal of the sheet-like elastic material configured to return from the state to the same flat surface as the sheet body, or the air bleeding member inserted in a form in which an opening is provided and the opening is expanded. A grout material filling system, characterized in that a sheet-shaped elastic material configured to return from an expanded state to a contracted state is provided as the air bleeding side blocking means. An air bleeding side shutter plate formed so as to be able to advance and retreat between a closed position that closes the air bleeding port and an open position that moves forward or backward from the closed position and opens the air bleeding port is used as the air bleeding side blocking means. The grout material filling system according to claim 7.

Images