JP6093288B2 - Safety management method and safety management system for movable weir repair work - Google Patents

Description

  The present invention relates to a safety management method and a safety management system in repair work of a movable weir installed in a river.

  Japanese Patent Application Laid-Open No. 2006-124929 describes a method of performing repair work one by one on a gate provided with four movable weirs constituting a dam. In the method described in this publication, a temporary pier used as a work space for performing various work related to gate repair is installed on the downstream side of the dam, and a temporary closing gate is installed on the upstream side of the gate to be repaired. Gate repair work is performed. In this way, water is stopped by installing a temporary gate, and river water is divided in repair work.

JP 2006-124929 A

  By the way, in a place relatively close to the coast in the river, the movable weir is provided to prevent the seawater from going up in the river water and to release the water downstream in the event of a flood. In other words, in a movable weir located near the coast, normally the gate is closed to separate river water upstream from the movable weir and river water mixed with salt downstream from the movable weir. Yes. When a flood occurs, the gate is opened, and the water upstream from the movable weir is opened downstream. Here, when seawater mixed with downstream salinity goes up from the movable weir, river water containing a large amount of salt will move upstream from the movable weir. May affect industrial water.

  Therefore, the movable weir located near the coast is required to repair the movable weir while maintaining the function as the movable weir by dividing the upstream river water and the downstream river water. . Such repair work of the movable weir is performed at a dividing point where the river water is divided into the upstream side and the downstream side, and many workers perform repair work at the dividing point. Therefore, it is required to take measures to protect the worker from the inflow of river water and the like to the parting site so that the worker can work with peace of mind. In addition, since the water depth and geology differ depending on the work site, it is necessary to formulate effective safety standards for each site.

  It is an object of the present invention to provide a safety management method and a safety management system in a movable dam repair work that enables an operator to perform the repair work with peace of mind during a movable dam repair work.

  A safety management method in repair work of a movable weir according to the present invention includes a movable weir comprising: at least two weir columns installed in a river; and a gate installed so as to bridge between the two weir columns. The first water stop structure installed in each of the weir pillars upstream of the gate and the second water stop structure installed in each of the weir pillars downstream of the gate And a safety management method in the repair work of the movable weir performed in the work space located between the two weir pillars, the first water stop structure and the second water stop structure. The water pressure measurement process for measuring the water pressure of the groundwater located below and notifying the worker that the water pressure measured in the water pressure measurement process is above the reference value, or from the observation well provided in the work space Warning to workers by groundwater discharge Cormorants and warning process, characterized in that it comprises a.

  In the safety management method in the repair work of the movable weir, the first water stop structure and the second water stop structure are installed on each of the two weir pillars, so that the upstream side to the downstream side are installed. The inflow of river water and the inflow of river water from the downstream side to the upstream side are prevented, and the upstream side of the movable weir and the downstream side of the movable weir are separated. And river water between the 1st water stop structure and the 2nd water stop structure is removed, and the river between the 1st water stop structure and the 2nd water stop structure is removed. A working space without water is formed. In this work space, there is a concern that water may enter the work space due to abnormal water pressure or the like of groundwater, and when such a situation occurs, the worker cannot continue working in the work space. However, in the safety management method according to the present invention, the water pressure of the groundwater located below the work space is measured, and a warning is given to the worker when the measured water pressure is equal to or higher than a reference value. It can be recognized that water is not safe before entering the work space. The worker can also recognize that it is not safe by visually observing that water is flowing out from the observation well in the work space. In this way, it is possible to complement the warning due to the groundwater pressure and the warning due to the observation well.

  The warning process includes a first warning process for giving a first-stage warning by notifying that the water pressure measured in the water pressure measurement process is equal to or higher than the first reference value, and the water pressure measured in the water pressure measurement process. And a second warning step of performing a second-stage warning by notifying that the value is equal to or greater than a second reference value greater than the first reference value. In this way, by making the warning process multi-stage, it is possible to make the worker recognize the importance of the warning, and it is also possible for the worker to recognize whether the work should be stopped immediately. .

  Further, in the warning step, a warning may be given to the worker by displaying on a display means provided in the work space. In this way, by warning the worker that the display means is not safe, the worker can recognize that it is not safe visually. Here, the warning by the display means includes, for example, a warning due to rotation of a rotating lamp.

  In the warning step, the worker may be warned by sending an e-mail when the water pressure measured in the water pressure measurement step is equal to or higher than a reference value. In this way, by issuing a warning by sending an e-mail, it is possible to recognize that the computer or mobile phone is not safe.

  A safety management system according to the present invention is a movable weir comprising at least two weir pillars installed in a river and a gate installed so as to bridge between the two weir pillars. Two weirs using a first water stop structure installed on each of the weir pillars on the side and a second water stop structure installed on each of the weir pillars on the downstream side of the gate A safety management system for safety management when performing work in a work space located between a pillar, a first water stop structure, and a second water stop structure, and located below the work space Water pressure measuring means to measure the water pressure of the groundwater to be measured, an observation well provided in the work space to warn the worker by discharging the groundwater, and the water pressure measured by the water pressure measuring means is above the reference value To the worker by informing Characterized in that it and a warning means for performing tell.

  Since this safety management system includes water pressure measuring means for measuring the water pressure of groundwater located below the work space, and warning means for warning the operator that the water pressure is not safe when the water pressure is above a reference value. The operator can recognize that the water is not safe before actually entering the work space. In addition, the operator can recognize that it is not safe when water flows out from the observation well provided in the work space. And since it becomes possible to mutually complement the warning by the water pressure of groundwater and the warning by an observation well, it can make an operator recognize that it is not safe more reliably.

  ADVANTAGE OF THE INVENTION According to this invention, during repair work of a movable weir, an operator can perform repair work in comfort.

It is a perspective view which shows the movable weir which is the application object of the safety management system which concerns on this invention. It is a perspective view which shows the reinforcement object part in the movable dam of FIG. It is a perspective view which shows the state which installed the liner plate in the movable dam of FIG. It is a perspective view which shows the state which installed the water stop structure in the dam pillar of the movable weir of FIG. It is a perspective view which shows the state which remove | eliminated the river water from between the water stop structures of FIG. It is a perspective view which shows the reinforcement object part in the movable dam shown in FIG. It is a side view of a dam pillar for demonstrating the operation | work which reinforces a dam pillar. 1 is a side view showing an embodiment of a safety management system according to the present invention. It is a top view which shows the arrangement | positioning state of a water pressure gauge and an observation well. It is a flowchart which shows one Embodiment of the safety management method which concerns on this invention. It is a perspective view which shows the dam pillar improvement body formed in the edge part of a dam pillar. It is a graph which shows an example of the time series data of the water level in a river and a work space.

  Hereinafter, a safety management method and a safety management system in repair work of a movable weir according to the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the movable weir 1 partitions river water upstream of the movable weir 1 in the river R and river water downstream of the movable weir 1. The movable weir 1 is arranged so as to span the river R, and is provided at a location relatively close to the coast in the river R. The movable weir 1 is used to adjust the flow rate and water level in the river R. Moreover, this movable weir 1 is provided in order to prevent the river water containing much salt from moving upstream.

  The movable weir 1 is normally in a state in which the existing gate 2 is closed, and when the existing gate 2 closes the river R, the flow that attempts to exceed the movable weir 1 of the river R is blocked. In addition, when an abnormality such as a flood occurs, the movable weir 1 raises the existing gate 2 with respect to the weir pillar 3 and opens it, thereby causing the upstream river water to flow downstream. In addition, the height of the existing gate 2 at the time of opening is about 5 m, for example. Thus, in the movable weir 1, the flow of river water in the river R can be controlled. In addition, a plurality of flat bottom plates B are disposed below the movable weir 1 (see FIG. 9).

  The existing gate 2 is hollow and is arranged in a straight line so as to block the flow of the river R. At both ends of the existing gate 2 in the longitudinal direction, weir pillars 3 which are concrete structures standing on the river R are provided, and the existing gate 2 is arranged so as to bridge the two weir pillars 3. It is installed on the weir pillar 3. A rail part 3a for raising and lowering the existing gate 2 with respect to the dam pillar 3 is arranged on the side surface of each dam pillar 3 where the existing gate 2 is installed, and the existing gate 2 slides on the rail part 3a. Supported as possible.

  In FIG. 1, two dam posts 3 and one existing gate 2 that bridges the two dam posts 3 are illustrated, but actually, the four dam posts 3 Three existing gates 2 that bridge the weir pillar 3 are provided. Moreover, the number of the dam pillar 3 and the existing gate 2 is not specifically limited.

  Further, both ends of the existing gate 2 are supported by a plurality of chains (not shown), and when pulled up by the chain, it is lifted along the rail portion 3a while rotating in one direction, and the chain is lowered. As a result, it is lowered along the rail portion 3a while rotating in the other direction. Thus, the existing gate 2 is a so-called rolling gate that moves up and down along the rail portion 3a of the weir column 3 while rotating. In the river R, the weir pillar 3 has an elongated shape extending in the flow direction of the river R. Moreover, since the rail part 3a of the weir column 3 is slightly inclined with respect to the vertical direction, the load required for raising and lowering the existing gate 2 is reduced.

  As shown in FIG. 7, in the inside of the dam pillar 3, a guard rebar 5 for preventing the dam pillar 3 from cracking is embedded in a lattice shape. The guard rebar 5 is embedded in a grid of about 20 cm square when viewed from the width direction of the river R. In addition, a filling station C and a bridge D where an operator waits are provided on the upper part of the weir pillar 3. Here, since the bridge D is bridged on the plurality of dam pillars 3, automobiles and the like pass over the river R through the bridge D regardless of whether or not the movable dam 1 is being repaired. It is possible to cross.

  In the repair work of the movable weir 1 configured as described above, the work for replacing the existing gate 2 with a new gate and the work for seismic reinforcement of the weir pillar 3 are performed. A side surface 3b of the weir column 3 shown in FIG. 2 is a portion to be reinforced. The new gate is, for example, a so-called shell structure roller gate that moves up and down without rotating along the rail portion 3a of the weir column 3 and has a hollow shell structure. Further, in the seismic reinforcement of the dam pillar 3, the two dam pillars 3 located on both sides of the existing gate 2 to be repaired are reinforced.

  Below, the repair method of the movable weir 1 is demonstrated, referring drawings. Since the repair of the movable weir 1 is performed on two existing gates 2 of the three existing gates 2, while the two existing gates 2 are being repaired, the remaining one existing gate 2 Can be used as usual.

  The reinforcement work of the dam pillar 3, the removal work of the existing gate 2, and the installation work of the new gate are all performed in the work space S (see FIG. 5) formed between the two dam pillars 3. The work space S includes two dam pillars 3, a prismatic first water stop structure 7 installed on the upstream side of the dam pillar 3, and a prismatic first part installed on the downstream side of the dam pillar 3. This is a space formed by two water-stop structures 8. In the work space S, the inflow of river water from both the upstream side of the dam pillar 3 and the downstream side of the dam pillar 3 is prevented by the first and second water stop structures 7 and 8. The length of the width direction in the river R of the 1st and 2nd water stop structures 7 and 8 is 35 m, for example. The working space S has, for example, a length in the flow direction of the river R of about 30 m, a length in the width direction of the river R of about 30 m, and a height of about 5 m.

  First, the preliminary work before forming the work space S will be described. As prior work before forming the work space S, as shown in FIG. 3, the end of the dam pillar 3 is repaired so that the second water stop structure 8 is in close contact with the dam pillar 3. First, a substantially cylindrical liner plate 9 is installed on the end 3d of the weir column 3 so as to surround the end 3d on the downstream side of the weir column 3 to close the end 3d. Then, the river water inside the liner plate 9 is removed by a pump, and the end 3d of the weir column 3 is exposed to the atmosphere, so that a work space A for the end 3d of the weir column 3 is obtained.

  Here, rubber (not shown) is interposed at the contact portion between the end portion 3d of the weir column 3 and the liner plate 9, and the liner plate 9 is in close contact with the weir column 3 through this rubber. 9 Inflow of river water into the interior is prevented. Further, since the liner plate 9 has a cylindrical shape, the water pressure of the river water applied to the liner plate 9 from the outside is applied to the liner plate 9 from almost all directions. Therefore, it is difficult for the liner plate 9 to move in the river R due to water pressure.

  After obtaining the work space A, as shown in FIG. 11, concrete is placed on the end 3 d of the dam pillar 3 to form a substantially rectangular parallelepiped dam pillar improvement body 3 e. The dam pillar improvement body 3e is provided to bring the second water stop structure 8 into close contact with the dam pillar 3. That is, since the plane of the second water stop structure 8 can be brought into close contact with the side surface 3f on the downstream side of the weir post improvement body 3e, the second water stop structure 8 is attached to the side face 3f of the weir post improvement body 3e. It is possible to prevent the inflow of river water into the work space S simply by pressing. Similarly to the above, the end of the dam pillar 3 is repaired so that the first water stop structure 7 is in close contact with the dam pillar 3 also on the upstream side of the dam pillar 3.

  After the end portion of the dam pillar 3 is repaired as described above, the first and second water-stop structures 7 and 8 are installed on the dam pillar 3 as shown in FIG. Before the installation on the weir column 3, the first and second water-stop structures 7 and 8 are substantially rectangular parallelepiped hollow boxes. Moreover, the water stop structures 7 and 8 are towed by the ship in a hollow state, and are pushed into and closely attached to the dam pillar improvement body 3e of the dam pillar 3. Then, water is poured into the internal space of the water stop structures 7 and 8 and the water stop structures 7 and 8 are submerged in close contact with the two weir pillars 3. As described above, since the water-stopping structures 7 and 8 sink into the river R when the water is injected into the water-stopping structures 7 and 8, a situation where the water-stopping structures 7 and 8 float is avoided. Is done.

  Next, as shown in FIG. 5, the operation is performed by removing the river water in the area surrounded by the two weir pillars 3, the first water stop structure 7 and the second water stop structure 8. A space S is formed. Thus, the work space S is formed by removing the river water located between the two dam posts 3, the first water stop structure 7 and the second water stop structure 8 to form the work space S. In S, work can be performed in the same way as on land. The operation of removing the river water is performed, for example, by pumping the river water with a plurality of pumps P (see FIG. 8).

  After the work space S is formed, the existing gate 2 is removed. The existing gate 2 is taken out of the work space S and removed in a state of being disassembled like a ring slice. The existing gate 2 is disassembled by, for example, applying the tip of the lancer cutting rod to the existing gate 2 and melting it. The disassembled existing gate 2 is removed from the work space S by being lifted by a crane of a crane carrier.

  Then, as shown in FIG. 6 and FIG. 7, the reinforcement work is performed on the side surface 3 b of the weir column 3. In addition, the location and size of the core rebar 5 embedded in the weir column 3 can be grasped in advance by rebar exploration, and after grasping the layout state of the core rebar 5, The guard rebar 5 is exposed over the surface. As a method of rolling the surface of the weir column 3, a water jet can be used, and the surface of the weir column 3 can be easily rolled by the high-pressure water flow of the water jet. In the above-described reinforcing bar exploration, the amount by which the weir pillar 3 is swung is also grasped in advance.

  After exposing the core reinforcing bar 5 over the surface of the weir column 3, the bar-shaped reinforcing reinforcing bar 6 is inserted into the side surface 3 b of the weir column 3 so as to avoid the lattice-shaped core reinforcing bar 5. Thus, by inserting the reinforcing reinforcing bars 6 so as not to interfere with the central reinforcing bar 5, problems such as cutting of the central reinforcing bar 5 due to the insertion of the reinforcing reinforcing bars 6 can be avoided. The reinforcing reinforcing bars 6 are shear reinforcing bars for preventing breakage due to shearing, for example, the concrete is displaced and cut by an earthquake. As an operation for inserting the reinforcing reinforcing bars 6, first, a through hole for inserting the reinforcing reinforcing bars 6 is opened on the side surface 3 b of the weir column 3 by horizontal boring performed by the core boring method.

  The reinforcing reinforcing bars 6 are inserted into the through holes, and a rust preventing grout is filled between the through holes and the reinforcing reinforcing bars 6. Then, both ends of the reinforcing reinforcing bar 6 are exposed from the weir column 3 and passed through a washer. In this state, both ends of the reinforcing reinforcing bar 6 are fixed to the side surface 3 b of the weir column 3. By inserting the reinforcing reinforcing bars 6 into the dam pillar 3 and fixing them in this way, it is possible to reinforce the dam pillar 3 and increase the resistance to the pulling force of the dam pillar 3 that is a concrete structure. Can do. Further, in the reinforcement work of the dam pillar 3, the strength of the dam pillar 3 can be further increased by fixing the bearing plates 21 at both ends of the reinforcing reinforcing bars 6 or increasing the thickness of the dam pillar 3.

  After completing the reinforcement work of the dam pillar 3 in this way, the work such as the repair of the rail portion 3a of the dam pillar 3 is performed to install a new gate. After the installation of the new gate is completed, water is injected into the work space S, and the first and second water stop structures 7 and 8 are removed from the weir pillar 3. The removed water-stop structures 7 and 8 are carried out by being towed by a ship, and then a series of operations is completed. The water-stop structures 7 and 8 carried out in this way can be used at another site and can be reused as appropriate.

  By the way, the water stop structures 7 and 8 are installed in each of the two weir pillars 3 so that the inflow of river water from the upstream side to the downstream side and the inflow of river water from the downstream side to the upstream side are prevented. The upstream side and the downstream side of the movable weir 1 are divided. And as FIG. 6 shows, the river water between the 1st water stop structure 7 and the 2nd water stop structure 8 is removed, and the 1st water stop structure 7 and the 1st water stop structure 7 A work space S having no river water is formed between the two water stop structures 8.

  In this work space S, there is a concern that water may enter the work space S due to abnormal water pressure or the like of groundwater. When such a situation occurs, the worker can continue working in the work space S. Disappear. Therefore, in the movable weir 1, when the work space S is formed and the worker performs work in the work space S, the situation where water enters the work space S as shown in FIG. 8 is dealt with. Therefore, a safety management system 10 is provided. The safety management system 10 has a function of determining safety standards as to whether or not work in the work space S is possible.

  The safety management system 10 includes water pressure gauges (water pressure measuring means) 11a and 11b that measure the water pressure of ground water in the sand layer N directly below the bottom plate B positioned below the work space S and below the work space S. Rotating lights (warning means, display means) 12 such as Patlite (registered trademark) for notifying the worker that it is not safe to work in the working space S, and water when the water pressure of groundwater is higher than normal. An observation well 13 and a computer 14 in the filling station C for collecting water pressure measurement data by the water pressure gauges 11a and 11b. About the number and arrangement | positioning of the water pressure gauges 11a and 11b, the rotary lamp 12, and the observation well 13 in the working space S, it is possible to change suitably according to the field.

  Normally, the water pressure of the groundwater is proportional to the depth, but when there is a possibility that the groundwater may be ejected into the work space S, the water pressure is higher than usual. The water pressure gauges 11a and 11b are provided to detect such an abnormal water pressure higher than normal. The water pressure gauges 11a and 11b start measuring the water pressure when the river water begins to be removed from the area surrounded by the water blocking structures 7 and 8 and the two weir pillars 3. The water pressure gauge 11a measures the water pressure directly below the bottom slab B, and the water pressure gauge 11b measures the water pressure of groundwater in the ground sand layer N located below the work space S. The water pressure gauges 11a and 11b are disposed at the lower ends of check holes formed through the bottom plate B, respectively.

  By arranging the two types of water pressure gauges 11a and 11b in this way, more accurate water pressure measurement is realized. Further, in the present embodiment, the water pressure gauges 11a and 11b are, for example, soil pore pressure gauges. The water pressure gauges 11a and 11b arranged in the check holes below the work space S convert the measured water pressure into an electric signal, and output the converted electric signal to the computer 14 in real time. Moreover, the measurement range of the water pressure by the water pressure gauges 11a and 11b can be, for example, 0.1 to 1.0 MPa, and an electric signal corresponding to the measured water pressure is output as water pressure data.

  In addition, as FIG. 9 shows, the water pressure gauges 11a and 11b are arrange | positioned at several places. If the water pressure gauges 11a and 11b output abnormal values due to contact abnormality or disconnection of the electric wire cords in the water pressure gauges 11a and 11b, the abandonment of the water pressure gauges 11a and 11b that output the abnormal values. Or installation of another water pressure gauge 11a, 11b is performed.

  The water pressure data measured by the water pressure gauges 11a and 11b as described above is output and stored in the computer 14. The water pressure data measured by the water pressure gauges 11a and 11b is always viewable by the computer 14 and remains in the computer 14 as a history. By providing the water pressure gauges 11a and 11b as described above, it is possible to detect whether the groundwater has entered the lower part of the bottom plate B and whether the water pressure by the groundwater is applied below the bottom plate B.

  When the water pressure measured by the water pressure gauges 11a and 11b is equal to or higher than the reference value, the computer 14 notifies the worker of an alarm that it is not safe to work in the work space S. Here, the water pressure data may be an average value of water pressure measured by the water pressure gauges 11a and 11b, or may be a maximum value. Further, when the computer 14 determines that the water pressure data is equal to or higher than the reference value, the computer 14 rotates the rotating lamp 12 in the work space S. The revolving light 12 includes two types of revolving lights comprising a red revolving light and a yellow revolving light. When the water pressure data is equal to or higher than the primary control value, the yellow revolving light rotates, The red rotating lamp rotates when the water pressure data of becomes more than the management reference value larger than the primary management value.

  The revolving light 12 is activated when the water pressure data measured by the water pressure gauges 11a and 11b is equal to or higher than a reference value, and allows the operator to recognize that it is not safe to work in the work space S. The revolving lamp 12 is disposed on an upper part of a spiral staircase (not shown) used when an operator in the vicinity of the water-stop structures 7 and 8 descends toward the work space S. Therefore, not only the worker in the work space S but also the worker trying to enter the work space S can recognize that it is not safe.

  Further, when the water pressure data measured by the water pressure gauges 11a and 11b is equal to or higher than the reference value, a mail notifying that the worker is not safe is transmitted to the mobile phone held by the worker. Instead of sending an unsafe email to the mobile phone, or sending an unsafe email to the mobile phone, the email may be sent to the computer 14 in the station C, for example. As described above, when an abnormality is notified to the worker by sending an e-mail or the rotating lamp 12, it is possible to quietly inform the worker that it is not safe. In addition, it is possible to make the operator recognize that it is not safe by automatic voice, for example, instead of sending an e-mail or the rotating lamp 12.

  Further, in the work space S, a cylindrical observation well 13 that is inserted into the ground from the bottom slab B located below the work space S and extends downward is disposed, and water enters the work space S from below. When there is a fear, water flows out from the observation well 13. Thus, since the water flows out from the observation well 13 when the groundwater pressure below the work space S is an abnormal water pressure, the worker in the work space S can immediately recognize the abnormality visually. It becomes possible. In addition, as a material of the observation well 13, a transparent polyvinyl chloride material can be used, for example.

  Before the work in the work space S, the observation well 13 is always checked, and it is confirmed that the observation well 13 has no abnormality. In addition, when working in the work space S, a plurality of workers are always working together, and when an abnormality is confirmed, a guidance and warning to evacuate from the work space S is issued to the worker. It is done. In addition, the position of the passage for the worker to evacuate and the route to evacuate are displayed in the work space S so that the worker can understand.

  Next, a safety management method for performing safety management of the work space S using the safety management system 10 will be described with reference to FIGS. 10 and 12. The process of the flowchart shown in FIG. 10 is from the start of removal of river water in the area surrounded by the two dam posts 3 and the water blocking structures 7 and 8 until the repair work of the movable dam 1 is completed. Repeatedly executed.

First, when removal of river water in an area surrounded by the two weir pillars 3 and the water blocking structures 7 and 8 is started, measurement of water pressure by the water pressure gauges 11a and 11b is started in step S11. Here, the removal of the river water is performed by a plurality of pump P (see FIG. 9), at time t ₁ before the waste water from the area is started by the pump P, upstream from the first water-stopping structure 7 The water level on the side is almost constant. Further, the water level downstream of the region and the second water stop structure 8 fluctuates at a constant period due to tidal fluctuations.

Also, when the drainage by the pump P at time t ₁ is carried out, pressure gauge 11a is pore pressure gauge located on the upstream side of the area, 11b readings (the value converted into water level), the downstream side of the region And the readings of the water pressure gauges 11a and 11b located at the lower position. Then, once it stops all pump P when a time t _2, the pressure gauge 11a on the upstream side, and readings 11b, pressure gauge 11a of the downstream side, and the readings 11b temporarily increased.

Then, at time t ₂ after watertight adjustment in the region is performed, waste water is started again by the pump P when it becomes time t _3. Then, pressure gauge 11a on the upstream side, and readings 11b, pressure gauge 11a of the downstream side, decreases the readings 11b, drainage at time _{t 4} is completed. Thus, the water level in the region is gradually lowered by the pump P, and finally the work space S is formed. When there is no abnormality in the process of forming the work space S, the readings of the water pressure gauges 11a and 11b do not increase. For example, when a phenomenon such as a rise in the water level occurs against the above-described decrease in the water level occurs. Increases the readings of the water pressure gauges 11a and 11b. Then, the readings of the raised water pressure gauges 11a and 11b are detected by the computer 14 as abnormal values.

  In the process of drainage in the area surrounded by the two weir pillars 3 and the water blocking structures 7 and 8 as described above, the measurement data by the water pressure gauges 11a and 11b is output to the computer 14 (water pressure measurement). Process). As shown in FIG. 10, in step S12, the computer 14 determines whether or not the water pressure data by the water pressure gauges 11a and 11b is equal to or higher than the primary management value (first reference value). Here, the primary management value means that there is a higher possibility that water will flow into the work space S than in the normal state. It shows a preferable value.

  In step S12, when it is determined that the water pressure data is not equal to or higher than the primary management value, the series of processes is terminated. On the other hand, if it is determined in step S12 that the water pressure data is greater than or equal to the primary management value, the process proceeds to step S13, where a warning is output to the worker in the work space S as a first-stage warning. The That is, the yellow revolving light 12 starts rotating, and a mail notifying that it is not safe is transmitted to the mobile phone owned by the worker (first warning step).

  And it transfers to step S14 and it is determined by the computer 14 whether the water pressure data by the water pressure gauges 11a and 11b is more than a management reference value (2nd reference value). Here, the management reference value is a value larger than the primary management value, and there is a higher possibility that water will flow into the work space S than the primary management value, and the worker immediately retreats from the work space S. The value that should be shown.

  In step S14, when it is determined that the water pressure data is not equal to or higher than the management reference value, the series of processes is terminated. On the other hand, when it is determined in step S14 that the water pressure data is equal to or higher than the management reference value, the process proceeds to step S15, and the work space S is used as a second-stage warning to the worker in the work space S. A evacuation command indicating that evacuation should be immediately performed is output. That is, the red rotating lamp 12 starts rotating, and a mail informing that the worker should immediately evacuate from the work space S is output to the mobile phone owned by the worker (second warning step). When a save command is output in step S15, a series of processing ends. Then, after all workers are evacuated from the work space S, it is confirmed that all the workers have evacuated, and then the river slab B is damaged by high-pressure groundwater by automatically injecting river water into the work space S. Is prevented.

  As described above, according to the safety management method and the safety management system 10 in the repair work of the movable weir 1, the water pressure of the groundwater located below the work space S is measured, and when the measured water pressure exceeds the reference value, the operator The operator can recognize that the water is not safe before actually entering the work space S. The worker can also recognize that it is not safe by visually observing that water is flowing out from the observation well 13 in the work space S. In this way, the warning due to the groundwater pressure measured by the water pressure gauges 11a and 11b and the warning due to the observation well 13 can be complemented each other.

  Further, according to the safety management method using the safety management system 10, the warning process is made into two stages using the alarm output in step S13 and the save command output in step S15 shown in FIG. Therefore, it is possible to make the worker recognize the importance of the warning, and the worker can also recognize whether or not the work should be stopped immediately. Note that the warning process may be executed in three or more stages.

  Further, in the warning step, the worker is warned that it is not safe due to the rotation of the rotating lamp 12, so that the worker can recognize visually that it is not safe. In the warning process, when the water pressure data measured in the water pressure measurement process exceeds the reference value, an e-mail is sent to warn the operator that the operator is aware that the mobile phone is not safe. Can do. Note that the same effect can be obtained by sending an e-mail not only to the mobile phone but also to, for example, the computer 14 in the station C.

  The present invention is not limited to the above-described embodiment, and various modifications as described below are possible without departing from the gist of the present invention.

  For example, in the above-described embodiment, the operator is notified that the rotation is not safe by using both the rotation of the revolving light 12 and the transmission of e-mail. The person may be notified. Moreover, although the revolving light 12 was used as a display means, you may use display means other than the revolving light 12, such as a traffic light.

  In the flowchart shown in FIG. 10, the computer 14 determines the water pressure data by the water pressure gauges 11 a and 11 b and warns the worker. Various warnings may be issued. That is, the water pressure measured by the water pressure gauges 11a and 11b may be converted into a water head. By using the water pressure data as the water head in this way, the water pressure data can be displayed in an easy-to-understand manner for the operator. ing. In this case, the management reference value and the primary management value described above are also represented by the head, and the management reference value and the primary management value are calculated using the predetermined safety factor and the thickness of the bottom plate B.

Specifically, for example, when the height of the working space S is 4.5 m, the safety factor is 4/3, and the thickness of the bottom plate B is 2.0 m, the management reference value is the water head from the bottom plate B,
4.5 ÷ (4/3) −2.0 = 1.375m → 1.3m
It can be. The primary control value is the water head from the bottom plate B.
4.5 ÷ (4/3) × 0.9−2.0 ≒ 1.03m → 1.0m
It can be. Thus, the primary management value can be 90% of the management reference value. However, the method for determining the management reference value and the primary management value is not limited to the above.

  In the above embodiment, the river water is automatically injected into the work space S after all the workers have evacuated from the work space S. However, for example, the water head exceeds the management reference value and all the workers are removed from the work space S. After evacuation, water may be automatically injected from the observation well 13 into the work space S due to a water head difference. Furthermore, water injection into the work space S may be performed by automatically operating a water injection pump installed in the river R.

  In addition, water pressure data includes data on water intrusion due to ground deformation or cracks. Furthermore, daily tide level fluctuations (tide fluctuations), floods during drought periods or typhoons and storms, or tsunami run-up The data regarding is also included as water pressure data. Furthermore, it is also possible to use data obtained by detecting in real time changes in buoys floating on the water surface or changes in structures in place of water pressure data.

  In the above embodiment, the example in which the safety management system 10 is used in the operation of replacing the existing gate 2 with a new gate has been described. However, the safety management method and the safety management system in the repair work of the movable weir according to the present invention are not limited to the work of replacing the existing gate 2 with the new gate, but are work related to the repair of the movable weir and there is a work space in the river. Any work that is formed can be applied.

DESCRIPTION OF SYMBOLS 1 ... Movable weir, 2 ... Existing gate (gate), 3 ... Weir pillar, 5 ... Heart rebar, 6 ... Reinforcing bar, 7, 8 ... Water stop structure, 9 ... Liner plate, 10 ... Safety management system, 11a , 11b ... Water pressure gauge (water pressure measuring means), 12 ... Revolving light (display means), 13 ... Observation well, 14 ... Computer.

Claims (5)

In a movable weir comprising: at least two weir pillars installed in a river; and a gate installed to bridge between the two weir pillars,
A first water stop structure installed on each of the weir pillars upstream of the gate; a second water stop structure installed on each of the weir pillars downstream of the gate; In the safety management method in the repair work of the movable weir performed in the work space located between the two dam posts, the first water stop structure, and the second water stop structure There,
A water pressure measuring step for measuring the water pressure of the groundwater located below the work space;
Warning to the operator by notifying an operator that the water pressure measured in the water pressure measuring step is equal to or higher than a reference value, or by the groundwater flowing out from an observation well provided in the work space. A warning process to be performed;
A safety management method in repair work of a movable weir characterized by comprising: The warning process includes
A first warning step for performing a first-stage warning by notifying that the water pressure measured in the water pressure measurement step is equal to or higher than a first reference value;
A second warning step for performing a second-stage warning by notifying that the water pressure measured in the water pressure measurement step is equal to or greater than a second reference value greater than the first reference value;
The safety management method in the repair work of the movable weir according to claim 1.   The safety management method in the repair work of the movable weir according to claim 1 or 2, wherein in the warning step, a warning is given to the worker by display of a display unit provided in the work space.   The warning process according to any one of claims 1 to 3, wherein a warning is given to the worker by sending an e-mail when the water pressure measured in the water pressure measurement process is equal to or higher than a reference value. A safety management method for renovating movable weirs. In a movable weir comprising: at least two weir pillars installed in a river; and a gate installed to bridge between the two weir pillars,
A first water stop structure installed on each of the weir pillars upstream of the gate; a second water stop structure installed on each of the weir pillars downstream of the gate; Safety management for safety management when working in a work space located between the two weir pillars, the first water stop structure, and the second water stop structure A system,
Water pressure measuring means for measuring the water pressure of groundwater located below the work space;
An observation well that is provided in the work space and warns an operator by allowing the groundwater to flow out;
Warning means for warning the worker by notifying the worker that the water pressure measured by the water pressure measuring means is equal to or higher than a reference value;
A safety management system comprising: