JP6241928B2 - Determination method for repair or reinforcement method - Google Patents

Description

  The present invention relates to a technique for selecting an optimum construction method from various field conditions, etc., from a repair method or a reinforcement method for a slope in which sprayed mortar has deteriorated.

There are many types of repair techniques for slopes that have become obsolete, and each has its own strengths and weaknesses. When repairing a slope with aging mortar, you should select a repair technique that matches the characteristics of the work site.
Since the technology is various and each has different advantages and disadvantages, it is very difficult to select a repair technology that matches the properties of the work site.
Furthermore, even if it is disaster prevention technology, the cost must be taken into consideration during construction. When there are a plurality of applicable repair technologies, cost effectiveness (cost / performance) is an important parameter in selecting a construction method.

Due to such circumstances, select a method that matches the properties of the site and that is superior in cost-effectiveness from multiple types of methods that repair or reinforce the slope of the mortar that has been sprayed. A technique that can be determined is conventionally desired.
However, no technology has been established that can meet such demands.

Other conventional technologies include, for example, investigating and analyzing existing mortar sprayers using a far-infrared imaging method with a far-infrared camera, measuring the depth of the cavity, and using an endoscope in front of the investigation hole in the cavity. Techniques for measuring the depth of the cavity have been proposed.
However, with such technology, it is possible to grasp the weathering of natural ground, but it is not possible to determine an appropriate construction method from the viewpoint of both on-site properties and costs.

JP 2009-79364 A

  The present invention has been proposed in view of the above-mentioned problems of the prior art, and can determine the repair method or reinforcement method of the slope where the mortar has deteriorated. The purpose of the present invention is to provide a method for determining a repair method or a reinforcement method capable of determining a method that is superior in terms of the above.

According to the present invention, the construction method selection system (60) provided with the cost calculation device (61), the construction method selection device (62), and the storage device (63) connected to the input device (7) is used.
The cost calculation device (61) calculates the costs of a plurality of construction methods to be processed from the construction method data output from the storage device (63) when necessary items are input by the input device (7). , Having the function of outputting the calculation result to the construction method selection device (62), the storage device (63) and the display device (8),
The construction method selection device (62) receives from the input device (7) various data related to whether or not the construction site conditions match the construction conditions of the target construction method, and the construction method selection device (62). Refers to the construction method data output from the storage device (63) and the plurality of cost calculation results output from the cost calculation device (61) to select and display the construction method that matches the situation at the construction site. Having the function of outputting to the device (8),
In the determination method for determining the repair or reinforcement method when the mortar sprayed on the slope by the method selection system (60) is aged,
The natural ground is stable (S1), but the mortar is not in close contact with the ground (S2) , the amount of spring water is small (S3), and the adhesion between the mortar and natural ground can be improved (S4) . If it is necessary to reinforce the natural ground surface layer (S5), after confirming that the thickness of the soil layer on the back natural ground is 0.5 m or less (S6), the space reinforcing work or the void that is the back surface reinforcing work Combining filling (S7) and surface reinforcement work (S8), it is judged whether or not the ground surface layer needs to be reinforced (S5). determines that the stable to about soft rock (S9), any of the method and the surface reinforcing Engineering in combination the rear reinforcing engineering and surface repair Engineering it is determined whether it is advantageous (S10), it is determined that advantageous were method is selected, the surface reinforcing Engineering not contain reinforcing rebar Engineering and fiber-reinforced mortar spraying Engineering It is characterized by being .

Moreover, according to this invention, using the construction method selection system (60) provided with the cost calculation apparatus (61) connected to the input device (7), the construction method selection apparatus (62), and the memory | storage device (63),
The cost calculation device (61) calculates the costs of a plurality of construction methods to be processed from the construction method data output from the storage device (63) when necessary items are input by the input device (7). , Having the function of outputting the calculation result to the construction method selection device (62), the storage device (63) and the display device (8),
The construction method selection device (62) receives from the input device (7) various data related to whether or not the construction site conditions match the construction conditions of the target construction method, and the construction method selection device (62). Refers to the construction method data output from the storage device (63) and the plurality of cost calculation results output from the cost calculation device (61) to select and display the construction method that matches the situation at the construction site. Having the function of outputting to the device (8),
In the determination method for determining the repair or reinforcement method when the mortar sprayed on the slope by the method selection system (60) is aged,
When the natural ground is stable (S1) and the mortar on the slope surface is in close contact with the natural ground (S2), when the operator inputs that fact with the input device (7), the display device (8) A question about the possibility of detachment or collapse of the mortar piece is displayed (SB1). If there is no possibility of separation or collapse of the mortar piece, follow up (SB6), and there is a possibility of detachment or collapse of the mortar piece. if any of the method of surface repair factory and the surface reinforcing Engineering it is determined whether it is advantageous (SB3), select the preferred method (SB4, SB5), the surface reinforcing Engineering (SB5) is fiber-reinforced mortar spraying Engineering And reinforced reinforcing bar .

Furthermore, according to the present invention, the construction method selection system (60) including the cost calculation device (61), the construction method selection device (62), and the storage device (63) connected to the input device (7) is used.
The cost calculation device (61) calculates the costs of a plurality of construction methods to be processed from the construction method data output from the storage device (63) when necessary items are input by the input device (7). , Having the function of outputting the calculation result to the construction method selection device (62), the storage device (63) and the display device (8),
The construction method selection device (62) receives from the input device (7) various data related to whether or not the construction site conditions match the construction conditions of the target construction method, and the construction method selection device (62). Refers to the construction method data output from the storage device (63) and the plurality of cost calculation results output from the cost calculation device (61) to select and display the construction method that matches the situation at the construction site. Having the function of outputting to the device (8),
In the determination method for determining the repair or reinforcement method when the mortar sprayed on the slope by the method selection system (60) is aged,
If the back ground is not stable (S1), a question regarding the possibility of a rock slide or landslide is displayed on the display device (8) (SC1). If there is a possibility of a rock slide or landslide, landslide countermeasure work should be taken. If there is no possibility of rock slide or landslide (SC2), the display device (8) will display a question as to whether it will change due to spring water (SC3), and if it does not change due to spring water, it will be advantageous to demolish the existing mortar (SC4), if it is advantageous to demolish the existing mortar, remove the existing mortar (SC6), perform slope stabilization (SC7), and if it is not advantageous to the display device (8) It is displayed that the thickness of the unstable layer assumed in the back ground is selected, and the thickness of the unstable layer is set to “0.5 m or less”, “0.5 m to 3 m” and “ 3.0m or more " Either one is selected (SC7), and it is determined whether or not the total cost is within the determined budget frame (SC8, SC12, SC16), and if it is within the budget frame, back reinforcement work is performed (SC9). , SC13, SC17), the back reinforcement work (SC9, SC17) when the thickness of the unstable layer is “0.5 m or less” and “0.5 m-3 m” is a fiber reinforced mortar spraying work and a reinforcing steel reinforcement work It is characterized by containing .

  And according to this invention, using the construction method selection system (60) provided with the cost calculation apparatus (61) connected to the input device (7), the construction method selection apparatus (62), and the memory | storage device (63),
  The cost calculation device (61) calculates the costs of a plurality of construction methods to be processed from the construction method data output from the storage device (63) when necessary items are input by the input device (7). , Having the function of outputting the calculation result to the construction method selection device (62), the storage device (63) and the display device (8),
  The construction method selection device (62) receives from the input device (7) various data related to whether or not the construction site conditions match the construction conditions of the target construction method, and the construction method selection device (62). Refers to the construction method data output from the storage device (63) and the plurality of cost calculation results output from the cost calculation device (61) to select and display the construction method that matches the situation at the construction site. Having the function of outputting to the device (8),
  In the determination method for determining the repair or reinforcement method when the mortar sprayed on the slope by the method selection system (60) is aged,
  If the back ground is not stable (S1), the display device (8) will display a question about the possibility of a rock slide or landslide (SC1), and if there is a possibility of a rock slide or landslide, take measures to prevent landslides. (SC2) If there is no possibility of rock slide or landslide, a question is displayed on the display device (8) about whether or not it changes due to spring water (SC3), and if there is a change due to spring water, the display device (8) A question is displayed as to whether drainage countermeasures are necessary (SD1). If drainage countermeasures are not required, removal works (SD2) and slope stabilization by mortar spraying (SD3) It is said.

In the present invention, a construction method selection system (60) including a cost calculation device (61), a construction method selection device (62), and a storage device (63) connected to the input device (7) is used.
  The cost calculation device (61) calculates the costs of a plurality of construction methods to be processed from the construction method data output from the storage device (63) when necessary items are input by the input device (7). , Having the function of outputting the calculation result to the construction method selection device (62), the storage device (63) and the display device (8),
  The construction method selection device (62) receives from the input device (7) various data related to whether or not the construction site conditions match the construction conditions of the target construction method, and the construction method selection device (62). Refers to the construction method data output from the storage device (63) and the plurality of cost calculation results output from the cost calculation device (61) to select and display the construction method that matches the situation at the construction site. Having the function of outputting to the device (8),
  In the determination method for determining the repair or reinforcement method when the mortar sprayed on the slope by the method selection system (60) is aged,
  If the back ground is not stable (S1), the display device (8) will display a question about the possibility of a rock slide or landslide (SC1), and if there is a possibility of a rock slide or landslide, take measures to prevent landslides. (SC2) If there is no possibility of rock slide or landslide, the display device (8) displays a question as to whether or not it changes due to spring water (SC3), and if there is a possibility of change due to spring water, the display device (8 ) Asks whether or not drainage countermeasures are necessary (SD1). If drainage countermeasures are necessary, it is judged whether it is advantageous to demolish existing mortar (SC4), and it is advantageous to demolish existing mortar. If there is, remove the existing mortar (SC6), perform slope stabilization (SC7), and if the demolition is not advantageous, select the thickness of the unstable layer assumed for the back ground in the display device (8) Is displayed Then, the thickness of the unstable layer is selected from “0.5 m or less”, “0.5 m to 3 m”, or “3.0 m or more” by the input device (7) (SC7), and the total cost for each of them. Is within the determined budget frame (SC8, SC12, SC16), and if it is within the budget frame, back reinforcement work is performed (SC9, SC13, SC17). The back reinforcement work (SC9, SC17) in the case of “0.5 m or less” and “0.5 m to 3 m” includes a fiber reinforced mortar spraying work and a reinforcing reinforcing bar work.

Further, in the fiber reinforced mortar spraying work, the solidified material includes the fiber (F), and the fiber (F) is made of polypropylene, and a large number of minute recesses (Fd: emboss) are formed on the surface thereof. The depth δ of the concave portion (Fd) is 0.1 mm to 0.25 mm, hydrophilic processing is preferably performed, and the tensile strength is preferably 600 N / mm ² or more.

According to the present invention having the above-described configuration, it is determined whether or not the natural ground is stable and whether or not the mortar sprayed on the slope is in close contact with the natural ground, thereby determining (selecting) ) The repair method and reinforcement method to be used are different. That is, according to the present invention, since the repair method and the reinforcement method determined (selected) depending on the property at the construction site are different, the method that matches the property at the site is determined.
In addition, since cost calculation is performed and a cost-effective method or a combination of methods is adopted at the time of determining the method, it is possible to determine a method that is superior in cost effectiveness.

In addition, according to the present invention, after determining the stability of the natural ground, which is the most important element as a disaster prevention measure, it is determined whether or not it is in close contact with the natural ground. Or, after judging that there is no rock slide or landslide, the repair method or the reinforcement method can be determined.
Therefore, there is no fear of selecting a construction method for removing aging mortar without considering the danger of natural ground.
That is, the construction method determined by the present invention is highly safe and suitable as a disaster prevention technique.

In the present invention, the fiber-reinforced mortar sprayer is solidified provided at the tips of a solidifying material conveying system (11-17) for conveying a solidifying material (for example, mortar) and a solidifying material conveying system (11-17). A material injection nozzle (50) and a rapid hardener supply system (rapid hardener supply pump 30, rapid hardener hose) in which a rapid hardener (slump killing agent) is transported and joins the solidified material transport system (11-17) 31 and 32), and a quick setting agent transport system (rapid set supply pump 40, quick set hose 41, etc.) for transporting the quick set agent. The tip portion has a function of adjusting the injection direction in a direction in which the quick-setting agent jet injected from the tip portion (the tip portion of the quick-setting agent hose 41) merges with the solidifying agent jet jetted from the solidifying agent jet nozzle (50). Using a solidifying material injection system (100) having It is possible.
If constituted in this way, the moisture contained in the solidified material (for example, mortar) is agglomerated by adding a rapid hardener, so that it acts on the hand-held nozzle (50, 50A) when spraying the solidified material for spraying. The jet power to be reduced is reduced. For this reason, even if the amount of the solidified material ejected is large, there is no fear of giving an excessive burden to the worker (M: nozzle man), and even in the work site where the spraying machine cannot enter, the worker (M : Nozzle man can support the nozzle (50, 50A) (so-called "hand-held") and perform spraying.

By aggregating the moisture contained in the solidified material, the amount of dust generated is reduced, the operator's field of view is secured, and the working environment is improved.
Further, since the quick setting agent is mixed during the solidifying material injection, the quick hardening agent and the quick setting agent are mixed separately, and the sprayed solidifying material instantly becomes non-fluid. For this reason, it is difficult for the solidified material to fall from the sprayed surface (for example, the overhang portion or the upper portion of the tunnel). For this reason, the amount of solidification material for spraying is reduced, so-called “material loss” is reduced, so that the operation cost is reduced.
Furthermore, by adding the quick hardening agent and the quick setting agent to the solidifying material for spraying, the amount of the drug used is reduced as compared with the case where only the quick setting agent is added, and the cost is also reduced in this respect.

It is a block diagram of a construction method selection system concerning an embodiment of the present invention. It is a flowchart which shows the control in embodiment of this invention. Fig. 3 is a flowchart similar to Fig. 2. It is explanatory drawing which shows collapse of the spraying mortar which should be considered with the flowchart of FIG. It is explanatory drawing which shows the state which the spraying mortar which should be considered with the flowchart of FIG. 3 deteriorated. It is explanatory drawing of weathering of the natural ground which should be considered with the flowchart of FIG. It is explanatory drawing which shows the collapse of the natural ground earth and sand which should be considered with the flowchart of FIG. It is explanatory drawing of the fall of the falling rock type which should be considered with the flowchart of FIG. 4 is a flowchart similar to FIGS. 2 and 3. 10 is a flowchart similar to that of FIGS. 2, 3, and 9. It is explanatory drawing which shows the 1st construction example suitably implemented by step S8 of FIG. 2, step S14, step SB15 of FIG. 3, step SC11 of FIG. 9, and step SC15. It is process drawing of the 1st construction example. It is a block diagram which shows the 2nd construction example of the fiber reinforced mortar spraying suitably implemented by step S8 of FIG. 2, step S14, step SB15 of FIG. 3, step SC11 of FIG. 9, and step SC15. It is explanatory drawing which shows the quick-hardener supply location in the solidification material supply system of the 2nd construction example. It is a side view which shows the mechanism which supplies the rapid hardening agent in the 2nd construction example. It is explanatory drawing which shows the mechanism mixed with a quick setting agent in the solidification material supply system front-end | tip in a 2nd construction example. It is a block diagram which shows the 3rd construction example of the fiber reinforcement mortar spraying suitably implemented by step S8 of FIG. 2, step S14, step SB15 of FIG. 3, step SC11 of FIG. 9, and step SC15. It is an expanded sectional view which shows an example of the fiber mixed in the solidification material conveyed by the 2nd construction example and the 3rd construction example. It is explanatory drawing which shows the outline | summary of the manufacture process of the fiber shown in FIG. It is explanatory drawing which shows the outline | summary of the raw material manufacture of the fiber shown in FIG.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 shows a system for implementing a method for selecting a method according to the illustrated embodiment.
In FIG. 1, the construction method selection system generally indicated by reference numeral 60 includes a cost calculation device 61, a construction method selection device 62, and a storage device 63.

The cost calculation device 61 is connected to the input device (for example, a keyboard) 7 via a line L71, connected to the construction method selection device 62 via a line L12, connected to the storage device 63 via a bidirectional line L13, and the display device 8 Connected by line L18.
And the cost calculation apparatus 61 will calculate the cost of several construction methods from the construction method data output from the memory | storage device 63, if the matter (data) required for cost calculation is input by the input device 7. FIG. Then, the calculation result is output to the construction method selection device 62, the storage device 63 and the display device 8.

The construction method selection device 62 is connected to an input device (for example, a keyboard) 7 via a line L72. Does the construction method selection device 62 to the input method 7 match the construction site conditions and the construction conditions of the target construction method? Various information and data related to whether or not are entered.
The construction method selection device 62 is connected to the storage device 63 via a line L32, and is connected to the display device 8 via a line L28.
When items necessary for cost calculation are input by the input device 7, the construction method selection device 62 outputs construction method data output from the storage device 63 (data on whether or not it matches the situation of the construction site), With reference to a plurality of cost calculation results output from the cost calculation device 61, a construction method that matches the situation of the construction site and / or has a low cost is selected, and the selected construction method is displayed on the display device 8. Output.

The input device 7 is connected to the storage means 63 via a line L73, and is connected to the display device 8 via a line L78.
When the construction method selection system 60 is activated, for example, questions such as steps S1 to S5 in the flowchart shown in FIG.
Then, an operator (operator) who operates the construction method selection system 60 answers the question by the input device 7.

Next, control of construction method selection by the construction method selection apparatus 100 of FIG. 1 will be described with reference to FIGS.
In the method selection control shown in FIGS. 2, 3, 9, and 10, as described above, the system operator (not shown) of the system 100 is placed on the monitor 8 of the display device (reference numeral 8 in FIG. 1). Various questions are displayed. Then, the system operator answers the question with, for example, “YES”, “NO”, or the like using the keyboard 7 which is an input device.
Alternatively, a system operator (not shown) can use the keyboard 7 as an input device to obtain information (data) necessary for cost calculation, various information related to whether the construction site conditions match the construction conditions of the target construction method, Data is entered.
Here, instead of using the construction method selection device 100, a site worker can perform construction method selection. In other words, the construction method selection can be controlled not by the construction method selection apparatus 100 but by a field worker.

In step S <b> 1 of FIG. 2, a question “Is the back ground mountain stable?” Is displayed on the monitor 8 of the display device 8. In step S1, when the back ground is stable (over soft rock) (step S2 is YES), the system operator or the investigator (operator) inputs “YES” with the input device 7.
Then, it progresses to step S2 and the question "Is the mortar on the slope surface closely attached to the natural ground?" Is displayed on the monitor 8 of the display device 8.

In step S2, when the mortar on the slope surface is not in close contact with the natural ground (step S2 is NO), the operator inputs “NO” with the input device 7.
Then, in step S3, a question “Is there a remarkable deformation due to spring water?” Is displayed on the monitor 8 of the display device 8.

When there is no remarkable deformation due to spring water (NO in step S3), the operator inputs “NO” in step S3.
In step S 4, a question “Can you improve the adhesion?” Is displayed on the monitor 8 of the display device 8.

In step S <b> 4, if the adhesion can be improved (YES in step S <b> 4), the operator inputs “YES” with the input device 7.
In step S5, a question “Is it necessary to reinforce the ground surface?” Is displayed on the monitor 8 of the display device 8.

In step S5, when it is necessary to reinforce the natural ground surface layer (step S5 is YES), the operator inputs “YES” by the input device 7 d, and in step S6, the thickness of the back ground natural soil layer becomes 0. After confirming that the distance is 5 m or less, the process proceeds to step S7.
If it is not necessary to reinforce the ground surface in step S5 (NO in step S5), the process proceeds to step S9.

In step S <b> 7, a message that “rear surface reinforcement work should be performed” is displayed. In the case of the back side construction method, void filling work (injecting cement or the like into the void created in the lower part of the surface mortar spraying) or cavity filling work (cement in the cavity larger than the void created in the lower part of the surface mortar spraying) Etc.) is constructed.
Proceeding from step S7 to step S8, "Surface reinforcement work should be performed" is displayed. In the surface reinforcement work, mortar is further sprayed on the surface of the existing mortar spraying to increase the thickness of the mortar layer (fiber reinforced mortar spraying or surface reinforcement (thickening) work). The mortar used in that case is a fiber reinforced mortar in which reinforcing fibers are mixed with cement (see FIG. 11).
In addition to that, a reinforcing bar is constructed in step S8. That is, in step S8, fiber reinforced mortar spraying and reinforcing bar work are performed.
Here, the length (for example, 1 m) of the reinforcing bar in the reinforcing bar is determined on a case-by-case basis depending on the thickness of the unstable layer.

  In the case of step S9 (step S5 is NO), it is determined that “the back ground is stable to a soft rock level”, and then the process proceeds to step S10. In step S10, either the construction method combining the back reinforcement work and the surface repair work ("A construction method" in step S10 of FIG. 2) or the surface reinforcement construction ("B construction method" in step S10 of FIG. 2) is the construction site. To determine whether it is advantageous. Here, the term “advantageous” means that it conforms to the conditions of the construction site and / or is advantageous in terms of cost. And in order to judge whether it is advantageous in terms of cost, the cost calculation device 61 of the construction method selection system 60 calculates the costs of both the A method and the B method, and either A or B method is cost effective. Determine if it is advantageous.

  If it is determined that “A method (a method in which the back surface reinforcement work and the surface repair work are combined) is more advantageous”, the process proceeds to step S11. In step S <b> 11, a message that “rear surface reinforcement work should be performed” is displayed. In the back reinforcement work, void filling work (construction injecting cement etc. into the void created in the lower part of the surface mortar spraying), or cavity filling work (cementing in the cavity larger than the void created in the lower part of the surface mortar spraying) Etc.) is performed. Then, the process proceeds to step S12, and a message that “surface repair work should be performed” is displayed. The surface repair work is a surface repair work (coating work) and / or a crack repair work.

On the other hand, if it is determined that “the B method (surface reinforcing method) is more advantageous”, the process proceeds to step S14, and “Surface reinforcing method should be performed” is displayed as in step 8 described above.
Here, the cost of spraying the fiber reinforced mortar in the surface reinforcing work can be easily calculated from the area of the construction site and the length of the bottom side.

  In step S2, when the mortar on the slope surface is in close contact with the natural ground (step S2 is YES), when the operator inputs “YES” with the input device 7, the control is performed in step “ Go to “B”.

  In the control of FIG. 3, in step SB1, the monitor 8 of the display device 8 asks "Is there a possibility that the mortar piece may be peeled off (see FIG. 5) or collapsed (see FIG. 4) due to surface deterioration such as cracks?" A question is displayed. In step SB1, if there is a possibility that the mortar pieces may be peeled off or collapsed due to surface deterioration such as cracks (step SB1 is YES), the operator inputs “YES” using the input device 7.

  Here, peeling of the mortar piece is a phenomenon in which the mortar piece 203d sprayed on the slope of the natural ground 200 falls downward as shown in FIG. Moreover, the collapse of the mortar sprayed on the slope is a phenomenon in which a partial region 203D of the mortar sprayed on the slope of the natural ground 200 collapses as shown in FIG.

When there is a possibility that the mortar piece may be peeled off or collapsed (step SB1 is YES), a crack opening is recognized in a wide range (step SB2). And it progresses to step SB3 and it is judged which method of surface repair work and surface reinforcement work is advantageous. As in step S10 (FIG. 2), the term “advantageous” means that it meets the conditions of the construction site and / or is advantageous in terms of cost. Then, in order to determine whether it is advantageous in terms of cost, the cost calculation device 61 of the method selection system 60 calculates the cost of either surface repair work or surface reinforcement work.
If surface repair work is more advantageous (“surface repair work is more advantageous” in step SB3), surface repair work (specifically, a coating work for coating the surface with new mortar) is performed in step SB4. A message to the effect is displayed.
On the other hand, if surface reinforcement is more advantageous (“surface reinforcement is more advantageous” in step SB3), “surface reinforcement (specifically, fiber reinforced mortar is sprayed on the surface to surface mortar) “A method of increasing the thickness of the layer and embedding a reinforcing bar having a length of 1 m at a right angle to the slope surface” is displayed.

  In step SB1, when there is no possibility of the mortar piece peeling or collapsing due to surface deterioration such as cracking (step SB1 is NO), the operator inputs “NO” with the input device 7. And (when there is no possibility of peeling or collapsing of the mortar pieces due to surface deterioration such as cracks: Step SB1 is NO), it is determined that there is no particular problem even if repair is not performed, and the process proceeds to Step SB6. “Monitoring (no countermeasures)” is displayed on the monitor 8.

Here, in step S1 of FIG. 2, “whether or not the back ground mountain is stable” is determined by whether or not the mortar itself has deteriorated due to cracking or floating on the mortar surface. The investigator visually confirms whether there is any collapse due to weathering of the mountain or slip due to earth pressure from the back. Alternatively, it is confirmed by a known investigation method.
The weathering of the back ground is caused by loosening of the groundwater or cracks due to freezing of the groundwater, and the slip due to earth pressure may be, for example, release of stress due to cut.

FIG. 6 shows a state (201) in which the natural ground 200 is weathered just below (inside) the spray mortar 203 on the surface.
The presence / absence of weathering and the thickness (W) survey of the weathered layer are determined by, for example, the amount of round steel penetration during the core removal survey.
FIG. 7 shows a state in which weathered earth and sand 201 collapses from the slope and falls together with the surface sprayed mortar 203D separated by the crack.
FIG. 8 shows that a crack occurred in the natural ground 200 and collapse of the falling rock 200D type occurred.

If the back ground is not stable in step S1 of FIG. 2 (step S1 is NO), the operator himself who received the report from the investigator inputs “NO” with the input device 7.
When the back ground is not stable (NO in step S1), the process proceeds to “C” in the control of FIG.

In step SC1 of FIG. 9, a question “Is there a possibility of a rock slide or a landslide?” Is displayed on the monitor 8 of the display device 8.
When it is determined that there is a possibility of a rock slide or a landslide based on the survey results of the field investigator (step SC1 is YES), “YES” is input by the input device 7. Then, the process proceeds to step SC <b> 2 and the monitor 8 displays that “the landslide countermeasure work should be taken” on the monitor 8 of the display device 8.

  Landslide countermeasure work is a restraint work that destroys a rockslip or a place where there is a possibility of a landslide (demolition work), and processes the generated soil (earth removal work) and / or drives an anchor (anchor work), It is a deterrent that drives a deterrent pile (deterrent pile).

If there is no possibility of a rock slide or landslide (NO in step SC1), “NO” is input by the input device 7. Then, in step SC3, a question “Is there a remarkable deformation due to spring water?” Is displayed on the monitor 8 of the display device 8.
If there is no significant deformation due to spring water (NO in step SC3), “NO” is input by the input device 7.
In step SC4, the construction method selection system 60 determines whether it is advantageous to demolish the existing mortar. Here, as described above, the term “advantageous” means that it conforms to the conditions of the construction site and / or is advantageous in terms of cost. And about a cost, a disadvantage is calculated by the cost calculation apparatus 61 of the construction method selection system 60. FIG.

If the demolition of the existing mortar is advantageous in terms of cost, the process automatically proceeds to step SC5, and the monitor 8 displays that “removal work (demolition work and industrial waste treatment) should be performed”.
Proceeding to step SC6, the monitor 8 displays that the “slope stabilization work” in which cutting work, mortar spraying, spraying frame work and rebar insertion work should be performed is performed.
On the other hand, if it is not advantageous to demolish the existing mortar (NO in step SC4), in step SC7, it is displayed on the display device 8 that the thickness of the unstable layer assumed as the back ground is selected. The operator selects the thickness of the unstable layer from “0.5 m or less”, “0.5 m to 3.0 m”, or “3.0 mm or more” by the input device 7.
From the inventors' experience, the collapse depth is very often 50 cm or less.
In addition, it is well known to those skilled in the art that in the case of slope collapse, those whose collapse depth is less than 3 m is about 80% of the total.
Steps SC9 to SC11, SC13 to SC15, and SC17 to SC19 in FIG. 9 are classified into three types based on such findings.

When the thickness of the unstable layer is “0.5 m or less”, the process proceeds to step SC8, and it is determined whether or not the cost from step SC9 to step SC11 falls within the determined range (budget frame).
In step SC8, if the total cost from step SC9 to step SC11 is within the determined budget frame (YES in step SC8), the monitor 8 indicates that “rear surface reinforcement work should be performed” in step SC9, Next, the process proceeds to step SC10, where the monitor 8 indicates that “a natural ground reinforcement work (a 2 m long reinforcing bar should be inserted at right angles to the slope)” is displayed on the monitor 8, and “fiber reinforced mortar spray (or surface) Reinforcement (thickening) work, spray method frame work and pressure plate work should be performed ”is displayed on the monitor 8.
Here, in the fiber reinforced mortar spraying, the fiber reinforced mortar is newly sprayed on the existing mortar spraying surface.
On the other hand, if the total cost from step SC9 to step SC11 does not fall within the determined budget frame (step SC8 is NO), the process returns to step SC4, and steps SC4 and after are repeated.

When the thickness of the unstable layer is “0.5 to 3.0 m”, it is determined in step SC12 whether or not the total cost from step SC13 to step SC15 is within a predetermined range (budget frame). to decide.
In step SC12, if the total cost from step SC13 to step SC15 is within the determined budget frame (YES in step SC12), the monitor 8 indicates that “rear surface reinforcement work should be performed” in step SC13, Next, the process proceeds to step SC14, and the monitor 8 displays that "a natural ground reinforcement work (inserting a reinforcing bar 2-5 m in length perpendicular to the slope)" is performed, and in step SC15, " The fact that “fiber reinforced mortar spraying, spraying frame work and pressure plate work” should be performed is displayed on the monitor 8.
On the other hand, if the total cost from step SC13 to step SC15 does not fall within the determined budget frame (NO in step SC12), the process returns to step SC4 and repeats the steps from step SC4.

When the thickness of the unstable layer is “3.0 m or more”, in step SC16, it is determined whether or not the total cost from step SC17 to step SC19 falls within a predetermined range (budget frame).
In step SC16, if the total cost from step SC17 to step SC19 is within the determined budget frame (YES in step SC16), the monitor 8 indicates that “rear surface reinforcement work should be performed” in step SC17. Is done. Then, the process proceeds to step SC18, and the monitor 8 displays that “the ground reinforcement work (anchor work) should be performed”.
Here, in steps SC8, SC12, and SC16, the determination regarding the total cost is performed, but it is possible to determine based on other criteria. Alternatively, steps SC8, SC12, and SC16 can be deleted.

Then, in step SC19, the message that “the spray method frame work and the pressure plate work should be performed” is displayed on the monitor 8.
On the other hand, if the total cost from step SC17 to step SC19 does not fall within the determined frame (step SC16 is NO), the process returns to step SC4 and repeats step SC4 and subsequent steps.

In step SC3, when there is a noticeable deformation due to spring water (YES in step SC3), [YES] is input by the input device 7.
In this case, the process proceeds to step “D” in the control of FIG.

In FIG. 10, in step SD <b> 1, a question “Is drainage work necessary?” Is displayed on the monitor 8 of the display device 8.
Here, when deciding whether or not drainage countermeasures are necessary, in addition to the situation at the construction site, consider whether the costs of drainage countermeasures and groundwater drainage work are within the specified value. To do.

If drainage countermeasure work is required (YES at step SD1), the process returns to step SC4 in FIG.
When the drainage countermeasure work is not required (NO in step SD1), the process proceeds to step SD2, and the message “removal work (demolition work and industrial waste treatment)” is displayed on the monitor 8 of the display device 8. Then, in step SD3, the display device 8 displays “to perform slope stabilization by mortar spraying”.

As described above, in FIG. 2, after determining whether or not the natural ground is stable, it is determined whether or not it is in close contact with the natural ground.
In the conventional technology, for example, the aging diagnosis technique of the spray slope by the conventional far-infrared imaging method, it is not determined whether or not the natural ground is stable. Therefore, in the conventional technology, when the mortar is not in close contact with the ground and the adhesiveness cannot be improved, in other words, the risk of the ground is not taken into account, or the risk of rock slide or landslide is considered. If not, there is a possibility of diagnosing the removal of aging mortar without taking such risks into account.
And it is unsuitable for disaster prevention to diagnose the removal of aging mortar without considering the danger in natural ground.

On the other hand, the illustrated embodiment is a technique for preventing slope collapse and is a disaster prevention measure. And control is performed on the premise that the most important element for disaster prevention measures is the stability of natural ground.
Therefore, in the embodiment shown in the figure, it is first determined whether or not the natural ground is stable, considering the danger of the natural ground, or judging that there is no rock slide or landslide, and has become aging Diagnose whether to remove the mortar.
Therefore, if the mortar is not in close contact with the ground and its adhesion cannot be improved, it will not be diagnosed that the old mortar will be removed. It is.

Further, as shown in FIG. 2, in the illustrated embodiment, it is determined whether or not the adhesion is improved after confirming that there is no significant deformation due to spring water.
When the amount of spring water is large, backfilling cannot be performed, and the adhesion of mortar to natural ground is not improved. In the method selection control shown in FIG. 2, since it is determined whether there is a large amount of spring water before determining whether adhesion can be improved, backfilling is performed despite the large amount of spring water. Is prevented.

Furthermore, in the illustrated embodiment, since the construction cost is always calculated when selecting the construction method, there is little risk of selecting a construction method that is disadvantageous in terms of cost.
In addition, the cost in spraying can be easily calculated from the area of the construction site and the length of the bottom.

An example of construction (first construction example) performed in step S8, step S14 in FIG. 2, step SB5 in FIG. 3, step SC11 in FIG. 9, and step SC15 is shown in FIG. I will explain.
The construction includes a fiber reinforced mortar sprayer and a reinforcing steel bar.

In FIG. 11, first, the lifeline 80 is arranged from the upper side to the lower side of the slope TF (“preparation work” SX1 in FIG. 12).
Here, on the slope TF of the construction site, there is a layer 201 that has become weathered and becomes unstable between the natural ground 200 and the existing concrete spray layer 202.
In FIG. 11, a cavity 204 (or a gap) also exists between the unstable layer 201 and the existing concrete spray layer 202.

In the “reinforcing bar” SX2 in FIG. 12, for example, an L-shaped reinforcing bar 90 having a length of 1 m is driven from the surface of the existing concrete spray layer 202 at a right angle to the slope TF.
Here, the head (L-shaped part) of the L-shaped reinforcing bar 90 driven into the slope TF is constructed so as to remain within the thickness of the mortar layer 203 to be sprayed.

In the “rear cavity injection work” SX3 in FIG. 12, a hole for injection is drilled in a part of the existing concrete spraying (surface) 202 located at the upper end of the cavity (gap) 204, and the injection material is inserted through the hole. Is injected into the cavity 204. This back cavity injection work SX3 can be omitted when the thickness of the cavity 204 is less than the allowable amount.
When the “rear cavity injection work” SX3 is performed, an injection material feeder (not shown) is installed on the ground surface GF connected to the lower end of the slope TF. A spraying worker (not shown) holds a tip nozzle (not shown) of a spraying hose (not shown) of the injection material feeder (not shown), and the injection material is injected from the injection hole formed in the cavity 204. Is injected into the cavity 204.

  In “shear bolt construction” SX4 in FIG. 12, dedicated shear bolts 91 are embedded at several locations in the vicinity of the existing concrete spraying surface 202 where the cavity 204 is formed on the back surface by a known construction method.

  In the “new drainage pipe construction” SX5 in FIG. 12, the drainage pipe 92 is placed in a horizontal state at the position corresponding to the lower end of the cavity 204 of the existing concrete spray (surface) 202 with its tip slightly facing downward. Buried with.

In the “slope cleaning work” SX6 in FIG. 12, the equipment used in the above SX1 to SX5 and the waste soil generated by each construction method are removed from the slope, and the slope is cleaned by watering the slope.
And "fiber reinforcement mortar spraying work" SX7 is constructed.

The state which is constructing the fiber reinforced mortar sprayer SX7 is shown in FIG.
In the example of FIG. 11, a wet sprayer 10A is installed on the ground surface GF connected to the lower end of the slope TF. Mortar material).
A spray hose 17A to which a nozzle 50A is attached is connected to the wet sprayer 10A, and the spray worker M holds the tip nozzle 50A and moves to the vicinity of the construction area.

The spray worker M is tied with a lifeline 80 and is positioned on the slope TF in a safe state.
Then, cement milk mixed with a fiber reinforcing material is sprayed onto the slope TF from the nozzle 50A toward the lower end of the construction area.
When the fiber reinforced mortar spraying work SX7 is completed, the worker M removes the lifeline 80 from the slope and returns to the ground surface GF from the slope together with the spray hose 17A.

The construction example of the fiber reinforced mortar spraying suitably implemented in step S8, step S14 in FIG. 2, step SB5 in FIG. 3, step SC11 in FIG. 9, and step SC15 is the first construction example shown in FIGS. It is not necessarily limited to.
Next, referring to FIG. 13 to FIG. 20, the second fiber-reinforced mortar spraying that is preferably performed in step S8, step S14 in FIG. 2, step SB5 in FIG. 3, step SC11 in FIG. A construction example will be described.

First, a second construction example will be described with reference to FIGS.
In FIG. 13, the solidifying material injection system generally indicated by reference numeral 100 includes a concrete pump 10, a mobile air compressor 20, a compressed air tank 21, a quick hardener supply pump 30, a quick setting agent supply pump 40, and an injection. A nozzle 50 is provided.

Between the concrete pump 10 and the injection nozzle 50, from the concrete pump 10 side toward the injection nozzle 50, the high pressure resistant hose 11, the concrete shutter 12, the concrete pipe 13, the plurality of wear resistant high pressure hoses 14, and the air ring pipe 15. The rapid hardening agent mixing ring 32, the taper tube 16, and the spray hose 17 are connected.
In FIG. 13, the single concrete pipe 13 is shown. However, when the distance between the concrete pump 10 and the injection nozzle 50 is long, a plurality of concrete pipes 13 may be added and used.

Details of the air ring tube 15 are shown in FIG.
In FIG. 14, the air ring pipe 15 has a concrete inlet 15a, two air inlets 15b and 15c, and a discharge port 15d.
The concrete inflow port 15a is located at the center of the three pipe lines on the inflow side (left side in FIG. 14), and solidified material such as mortar flows through the inside. The air inlets 15b and 15c are arranged so as to sandwich the concrete inlet 15a, and air flows through the inside.
The solidified material supplied through the concrete inlet 15a is entrained by the air supplied from the air inlets 15b and 15c.
In FIG. 14, a rapid hardener mixing ring 32 is disposed between the air ring tube 15 and the taper tube 16. The rapid hardening agent mixing ring 32 is a member for joining the rapid hardening agent (slump killing agent) with the solidifying material, and is provided to uniformly mix the rapid hardening agent with the solidifying material.

In FIG. 13, an air tank 21 is a storage means for storing the compressed air generated by the mobile air compressor 20. The air tank 21 is provided with an air inlet 21a and three air outlets 21b, 21c, and 21d.
The mobile air compressor 20 and the air inlet 21 a of the air tank 21 are connected by an air hose 22.
The air discharge ports 21b and 21c of the air tank 21 and the air inlets 15b and 15c of the air ring pipe 15 are connected by air hoses 23 and 24, respectively. In the air ring pipe 15, the solidified material supplied from the concrete pump 10 and the high-pressure air supplied from the mobile air compressor 20 are mixed, so that the solidified material is entrained in the high-pressure air and reaches the injection nozzle 50. Is injected.

The air discharge port 21 d of the air tank 21 and the air inlet 32 a in the rapid hardening agent mixing ring 32 are connected by an air hose 25.
The rapid hardening agent supply pump 30 and the rapid hardening agent inlet 32 b in the rapid hardening agent mixing ring 32 are connected by a rapid hardening agent supply hose 31. Therefore, the rapid hardening agent is entrained in the air and supplied to the rapid hardening agent mixing ring 32.

In FIG. 15, the rapid hardening agent mixing ring 32 has a rapid hardening agent mixing part (ring body) 320, an air supply part 32a, a rapid hardening agent supply part 32b, and a T-shaped mixing part 32c. Yes. The rapid hardening agent mixing part (ring main body) 320 has a resin-processed inner surface and is configured so that the solidified material does not adhere.
An open / close valve 32av is interposed in the air supply part 32a, and an open / close valve 32bv is interposed in the rapid hardener supply part 32b.
Rapid hardening agent and high-pressure air flow into the mixing part 32c. The rapid hardening agent is entrained in the high pressure air and sent to the rapid hardening agent mixing unit 320 while being mixed with the high pressure air.
The high-pressure air and the rapid hardening agent entrained in the high-pressure air flow into the rapid hardening agent mixing section (ring main body) 320 and the mixed flow of the solidified material and the high-pressure air flowing through the rapid hardening agent mixing section (ring main body) 320. To be mixed.

As shown in FIG. 15, the mixing unit 32 c is connected to the rapid hardening agent mixing unit 320. The mixing unit 32c is not shown in FIG. In FIG. 14, only the circular region 32H in which two holes (φ2 mm) are perforated is shown in the rapid hardening agent mixing ring 32, and the mixing portion 32c (see FIG. 15) is connected to the region 32H. .
The reason why two holes of φ2 mm are drilled in the circular region 32H is to ensure the supply of the hardener. If the two holes are perforated, even if one of the holes is closed, the hardener is supplied to the solidified material flowing in the quickener mixing ring 32 via the other hole. On the other hand, if only one relatively large-diameter hole is perforated, when the relatively large-diameter hole is blocked, the rapid hardening agent becomes a solidified material flowing in the rapid hardening agent mixing ring 32. It will not be supplied.

In FIG. 14, a quick hardener mixing ring 32 is connected to the air ring pipe 15, and a tapered pipe 16 (larger diameter side) is connected to the quick hardener mixing ring 32.
If the taper pipe 16 is connected to the air ring pipe 15 and the rapid hardening agent mixing ring 32 is connected to the (small diameter side) of the taper pipe 16, the high-pressure air inside the taper pipe 16 flows so as to surround the solidified material. End up. In such a state, the rapid hardening agent and the solidifying material are not well mixed.
Therefore, the arrangement of the rapid hardening agent mixing ring 32 is determined so that the rapid hardening agent and the solidifying material are mixed on the upstream side of the tapered tube 16.

In FIG. 14, a blowing hose 17 is connected to a discharge port (small diameter side: right side in FIG. 14) 16 b of the tapered pipe 16. As shown in FIG. 13, the solidifying material inlet 50a of the injection nozzle 50 is connected to the tip of the spray hose 17 (see FIG. 13).
In FIG. 13, the injection nozzle 50 is shown as if the solidifying material injection port 50 a and the quick setting agent injection port 50 b are integrated, but the quick setting agent injection port 50 b constitutes the injection nozzle 50. Not done. The injection nozzle 50 will be described later with reference to FIG.

In FIGS. 14 and 16, a quick setting agent injection hose 43 having flexibility is disposed in the vicinity of the injection nozzle 50 along the injection nozzle 50.
The quick setting agent injection hose 43 is tied to the vicinity of the injection nozzle 50 by a binding tool (for example, a wire or vinyl tape) 45. Although not clearly shown in FIG. 16, the quick setting agent injection hose 43 extends along the spray hose 17.
A discharge side 42c of the merging pipe 42 is connected to an end 43a opposite to the injection side 43b in the quick setting agent injection hose 43. The merging pipe 42 is connected to the supply system of the quick linking agent and high-pressure air. Supply systems are merged. The merging pipe 42 is connected to a high-pressure air inflow portion 42a and a quick setting agent inflow portion 42b. As described above, the discharge side 42 c of the junction pipe 42 is connected to the quick setting agent injection hose 43, and the quick setting agent injection hose 43 is bound near the injection nozzle 50 by the binding tool 45.

A quick setting agent supply hose 41 is connected to the quick setting agent inflow portion 42b, and an air hose (not shown) is connected to the high pressure air inflow portion 42a. Although not explicitly shown, the air hose is connected to the air tank 21 (see FIG. 13).
An on-off valve 42av is interposed in the high-pressure air inflow portion 42a, and an on-off valve 42bv is interposed in the quick setting agent inflow portion 42b.
The quick setting agent supply hose 41 connected to the quick setting agent inlet 42b is connected to the quick setting agent supply pump 40 (see FIG. 13).

At the time of spraying, the solidifying material is injected from the injection nozzle 50, and at the same time, the on-off valve 42av of the high-pressure air inlet 42a and the on-off valve 42bv of the quick setting agent inlet 42b are opened. Thereby, the quick setting agent supplied via the quick setting agent supply hose 41 and the quick setting agent inflow portion 42b is taken to the high pressure air supplied via the air hose and the high pressure air inflow portion 42a, and the quick setting agent injection Sprayed from the hose 43.
Then, the jet of the rapid setting agent merges with the jet of the solidified material from the injection nozzle 50, and is mixed and injected into the construction area (for example, the slope). As described above, since the hardener is mixed in the solidifying material, the quick hardening agent and the quick setting agent are mixed in the solidifying material by merging with the jet of the quick setting agent. Fluidize.

According to the second construction example, by adding a hardener to the solidified material, moisture contained in the solidified material aggregates, and the jet power acting on the hand-held nozzle 50 when spraying the solidified material for spraying is reduced. To do. For this reason, even if the amount of the solidified material ejected is large, there is no fear of giving an excessive burden on the operator (nozzle man).
Therefore, even in a work site where the spraying machine cannot enter, the spraying work can be performed by the operator (nozzle man) supporting the nozzle 50 (so-called “hand-held”).

And since the water | moisture content contained in a solidification material aggregates, the generation amount of dust reduces, an operator's visual field is ensured, and a working environment is improved.
For example, in a spraying work according to the prior art, the field of view is almost zero at a location about 3 m away from the nozzle, and the worker's field of view is poor, so the work is often difficult. On the other hand, according to the present invention, the worker's field of vision is maintained in a clear state sufficient for performing the work.

In addition, according to the second construction example, when the solidifying material is jetted, it merges with the jet of the quick setting agent, so that the quick hardening agent and the quick setting agent are mixed and mixed in the solidifying material. Instantly becomes non-fluidized or solidified. For this reason, it is difficult for the solidified material to fall from the sprayed surface (for example, the overhang portion or the upper portion of the tunnel).
According to the inventor's experiment, in the second construction example, the fall amount of the solidified material sprayed on the overhang portion or the upper part of the tunnel was reduced to about 30% of the fall amount in the prior art.
Therefore, according to the second construction example, compared with the prior art, the amount of solidification material for spraying is reduced, so-called “material loss” is reduced, and work cost is reduced.

Further, in the second construction example in which the quick hardening agent and the quick setting agent are added to the solidifying material for spraying, the amount of the drug used is reduced as compared with the case of adding only the quick setting agent.
According to the inventor's experiment, when only the quick setting agent was used, the used amount of the quick setting agent was 7 to 10% by weight based on the cement. On the other hand, in the second construction example, the usage amount of the quick hardening agent and the quick setting agent was 3% by weight with respect to the cement.
As a result of the reduction in the amount of the hardener and the quick setting agent, the construction cost of the second construction example is reduced.

Next, a third construction example will be described with reference to FIG.
In the third construction example shown in FIG. 17 (reference numeral 100A is given to the entire solidifying material injection system), the rapid setting agent supply system in the second construction example is omitted.

  That is, the solidifying material injection system 100A of the third construction example is different from the solidifying material injection system 100 of the second construction example in that the quick setting agent supply pump 40, the quick setting agent supply hose 41, the quick setting agent and the high pressure air. The joining pipe 42, the quick setting agent injection hose 43, the binding tool 45, and the air hose (not shown in FIG. 13) are omitted (eliminated).

As described above, in the solidifying material injection system 100A of the third construction example, the supply system of the quick setting agent is omitted, but since the quick hardening agent is added, moisture contained in the solidifying material is aggregated. The spray output acting on the nozzle held by the operator (nozzle man) at the time of spraying the solidifying material for spraying is reduced, and the burden on the operator is reduced.
Moreover, the generation amount of dust is reduced, the worker's view is ensured, and the working environment in the spraying work is improved.

Furthermore, when spraying on an overhang part, a tunnel upper part, etc., the fall amount of the solidification material for spraying reduces compared with the prior art which does not mix a rapid hardening agent. Therefore, the operation cost is reduced (compared to the prior art in which no rapid hardener is mixed).
The other structure and effect in the 3rd construction example shown in FIG. 17 are the same as that of the 2nd construction example of FIGS.

For example, the fiber F shown in FIG. 18 is suitable as the fiber that can be suitably mixed in the solidifying material used in the spraying work in the solidifying material injection system according to the second construction example and the third construction example. is there.
In FIG. 18, the material of the fiber F is polypropylene, and a large number of minute recesses (embosses) Fd are formed on the surface thereof. The depth δ of the recess Fd is 0.1 mm to 0.25 mm. The hydrophilicity is added to the fiber F by forming the recessed part Fd. The tensile strength of the fiber F is 600 N / mm ² or more.
If the fiber F is mixed with the solidified material of the solidified material injection system of the first construction example and the second construction example, for example, it is kneaded into cement (solidified material) which is a raw concrete material by a concrete mixer (not shown). Is done.

FIG. 19 schematically shows equipment for forming a large number of recesses (embosses) Fd on the surface of the fiber F.
In FIG. 19, the fiber (elementary wire) Fm in a state before forming a large number of recesses (embossed) Fd on the surface is wound around the element reel 1. The wound wire Fm is drawn in the direction of arrow P by a drawing mechanism (not shown) and a pair of rollers (embossed type rollers) 2 and 3.
Although not clearly shown, innumerable minute protrusions are formed on the surfaces of the pair of rollers 2 and 3, and the height of the minute protrusions is the height of the recess Fd in the fiber F in FIG. 18. Corresponds to the depth dimension δ.

The strand Fm is pulled out by a pair of rollers (embossed type rollers) 2 and 3, whereby a large number of minute recesses (embosses) Fd are formed on the surface of the strand Fm.
Here, if the recessed part (emboss) Fd is formed in the surface of the strand Fm, the cross-sectional area of the fiber F will reduce. As a result, there is a risk that the tensile strength decreases and the reinforcement performance deteriorates.
On the other hand, the said fiber F is improving the tensile strength to 600 N / mm < ² > or more.

The aspect which improves the tensile strength of the fiber F is demonstrated in FIG.
In FIG. 19, the wire Fm wound around the reel is manufactured according to the aspect shown in FIG. 20.
In FIG. 20, the strand Fm is pulled out from the fiber material (PP: polypropylene) pellet Fp in the direction of arrow P1 by a mechanism (not shown). If the speed at which the wire Fm is drawn out increases, the strength of the drawn wire Fm decreases. If the speed at which the wire Fm is pulled out decreases, the strength of the drawn wire Fm increases.
In the illustrated construction example, the recess (emboss) Fd is formed in the manner shown in FIG. 19, and the cross-sectional area of the fiber F is reduced, whereby the tensile strength is reduced. In order to compensate for this, in FIG. 20, the speed at which the strands are drawn from the fiber material (PP: polypropylene) pellets Fp is decreased, thereby increasing the tensile strength of the strands.

It should be noted that the illustrated embodiments and construction examples are merely examples, and are not descriptions that limit the technical scope of the present invention.
For example, in the illustrated embodiment, the method selection control is performed by the method selection device 100, but a site worker can execute the method selection. In other words, the present invention includes a case where a construction worker selects a construction method in the illustrated embodiment by a field worker.

DESCRIPTION OF SYMBOLS 7 ... Input device 8 ... Display device 10 ... Concrete pump truck 10A ... Wet sprayer 11 ... High pressure hose 13 ... Concrete pipe 15 ... Air ring pipe 16 ... Tapered tube 17 ... spraying hose 20 ... mobile air compressor 20
21 ... Air tank 30 ... Quick hardener supply pump 31 ... Quick hardener supply hose 32 ... Quick hardener mixing ring 40 ... Quick set supply pump 41 ... Quick set supply hose 50 ... Injection nozzle 60 ... Construction method selection system 61 ... Cost calculation device 62 ... Construction method selection device

Claims (5)

Using a construction method selection system (60) comprising a cost calculation device (61), a construction method selection device (62), and a storage device (63) connected to the input device (7),
The cost calculation device (61) calculates the costs of a plurality of construction methods to be processed from the construction method data output from the storage device (63) when necessary items are input by the input device (7). , Having the function of outputting the calculation result to the construction method selection device (62), the storage device (63) and the display device (8),
The construction method selection device (62) receives from the input device (7) various data related to whether or not the construction site conditions match the construction conditions of the target construction method, and the construction method selection device (62). Refers to the construction method data output from the storage device (63) and the plurality of cost calculation results output from the cost calculation device (61) to select and display the construction method that matches the situation at the construction site. Having the function of outputting to the device (8),
In the determination method for determining the repair or reinforcement method when the mortar sprayed on the slope by the method selection system (60) is aged,
The natural ground is stable (S1), but the mortar is not in close contact with the ground (S2) , the amount of spring water is small (S3), and the adhesion between the mortar and natural ground can be improved (S4) . If it is necessary to reinforce the natural ground surface layer (S5), after confirming that the thickness of the soil layer on the back natural ground is 0.5 m or less (S6), the space reinforcing work or the void that is the back surface reinforcing work Combining filling (S7) and surface reinforcement work (S8), it is judged whether or not the ground surface layer needs to be reinforced (S5). (S9), it is determined whether the combination of the back reinforcement work and the surface repair work or the surface reinforcement work is advantageous (S10), and the construction method judged advantageous is selected. the surface reinforcement Engineering is characterized in that it contains reinforcing rebar Engineering and fiber-reinforced mortar spraying Engineering How to determine repair or reinforcement method. Using a construction method selection system (60) comprising a cost calculation device (61), a construction method selection device (62), and a storage device (63) connected to the input device (7),
The cost calculation device (61) calculates the costs of a plurality of construction methods to be processed from the construction method data output from the storage device (63) when necessary items are input by the input device (7). , Having the function of outputting the calculation result to the construction method selection device (62), the storage device (63) and the display device (8),
The construction method selection device (62) receives from the input device (7) various data related to whether or not the construction site conditions match the construction conditions of the target construction method, and the construction method selection device (62). Refers to the construction method data output from the storage device (63) and the plurality of cost calculation results output from the cost calculation device (61) to select and display the construction method that matches the situation at the construction site. Having the function of outputting to the device (8),
In the determination method for determining the repair or reinforcement method when the mortar sprayed on the slope by the method selection system (60) is aged,
When the natural ground is stable (S1) and the mortar on the slope surface is in close contact with the natural ground (S2), when the operator inputs that fact with the input device (7), the display device (8) A question about the possibility of detachment or collapse of the mortar piece is displayed (SB1). If there is no possibility of separation or collapse of the mortar piece, follow up (SB6), and there is a possibility of detachment or collapse of the mortar piece. if any of the method of surface repair factory and the surface reinforcing Engineering it is determined whether it is advantageous (SB3), select the preferred method (SB4, SB5), the surface reinforcing Engineering (SB5) is fiber-reinforced mortar spraying Engineering And a method for determining a repair or reinforcement method characterized by including a reinforcing steel bar . Using a construction method selection system (60) comprising a cost calculation device (61), a construction method selection device (62), and a storage device (63) connected to the input device (7),
The cost calculation device (61) calculates the costs of a plurality of construction methods to be processed from the construction method data output from the storage device (63) when necessary items are input by the input device (7). , Having the function of outputting the calculation result to the construction method selection device (62), the storage device (63) and the display device (8),
The construction method selection device (62) receives from the input device (7) various data related to whether or not the construction site conditions match the construction conditions of the target construction method, and the construction method selection device (62). Refers to the construction method data output from the storage device (63) and the plurality of cost calculation results output from the cost calculation device (61) to select and display the construction method that matches the situation at the construction site. Having the function of outputting to the device (8),
In the determination method for determining the repair or reinforcement method when the mortar sprayed on the slope by the method selection system (60) is aged,
If the back ground is not stable (S1), a question regarding the possibility of a rock slide or landslide is displayed on the display device (8) (SC1). If there is a possibility of a rock slide or landslide, landslide countermeasure work should be taken. If there is no possibility of rock slide or landslide (SC2), the display device (8) will display a question as to whether it will change due to spring water (SC3), and if it does not change due to spring water, it will be advantageous to demolish the existing mortar (SC4), if it is advantageous to demolish the existing mortar, remove the existing mortar (SC6), perform slope stabilization (SC7), and if it is not advantageous to the display device (8) It is displayed that the thickness of the unstable layer assumed in the back ground is selected, and the thickness of the unstable layer is set to “0.5 m or less”, “0.5 m to 3 m” and “ 3.0m or more " Either one is selected (SC7), and it is determined whether or not the total cost is within the determined budget frame (SC8, SC12, SC16), and if it is within the budget frame, back reinforcement work is performed (SC9). , SC13, SC17), the back reinforcement work (SC9, SC17) when the thickness of the unstable layer is “0.5 m or less” and “0.5 m-3 m” is a fiber reinforced mortar spraying work and a reinforcing steel reinforcement work A method for determining a repair or reinforcement method characterized by including Using a construction method selection system (60) comprising a cost calculation device (61), a construction method selection device (62), and a storage device (63) connected to the input device (7),
The cost calculation device (61) calculates the costs of a plurality of construction methods to be processed from the construction method data output from the storage device (63) when necessary items are input by the input device (7). , Having the function of outputting the calculation result to the construction method selection device (62), the storage device (63) and the display device (8),
The construction method selection device (62) receives from the input device (7) various data related to whether or not the construction site conditions match the construction conditions of the target construction method, and the construction method selection device (62). Refers to the construction method data output from the storage device (63) and the plurality of cost calculation results output from the cost calculation device (61) to select and display the construction method that matches the situation at the construction site. Having the function of outputting to the device (8),
In the determination method for determining the repair or reinforcement method when the mortar sprayed on the slope by the method selection system (60) is aged,
If the back ground is not stable (S1), the display device (8) will display a question about the possibility of a rock slide or landslide (SC1), and if there is a possibility of a rock slide or landslide, take measures to prevent landslides. (SC2) If there is no possibility of rock slide or landslide, a question is displayed on the display device (8) about whether or not it changes due to spring water (SC3), and if there is a change due to spring water, the display device (8) A question is displayed as to whether drainage countermeasures are necessary (SD1). If drainage countermeasures are not required, removal works (SD2) and slope stabilization by mortar spraying (SD3) How to determine repair or reinforcement method. Using a construction method selection system (60) comprising a cost calculation device (61), a construction method selection device (62), and a storage device (63) connected to the input device (7),
The cost calculation device (61) calculates the costs of a plurality of construction methods to be processed from the construction method data output from the storage device (63) when necessary items are input by the input device (7). , Having the function of outputting the calculation result to the construction method selection device (62), the storage device (63) and the display device (8),
The construction method selection device (62) receives from the input device (7) various data related to whether or not the construction site conditions match the construction conditions of the target construction method, and the construction method selection device (62). Refers to the construction method data output from the storage device (63) and the plurality of cost calculation results output from the cost calculation device (61) to select and display the construction method that matches the situation at the construction site. Having the function of outputting to the device (8),
In the determination method for determining the repair or reinforcement method when the mortar sprayed on the slope by the method selection system (60) is aged,
If the back ground is not stable (S1), the display device (8) will display a question about the possibility of a rock slide or landslide (SC1), and if there is a possibility of a rock slide or landslide, take measures to prevent landslides. (SC2) If there is no possibility of rock slide or landslide, the display device (8) displays a question as to whether or not it changes due to spring water (SC3), and if there is a possibility of change due to spring water, the display device (8 ) Asks whether or not drainage countermeasures are necessary (SD1). If drainage countermeasures are necessary, it is judged whether it is advantageous to demolish existing mortar (SC4), and it is advantageous to demolish existing mortar. If there is, remove the existing mortar (SC6), perform slope stabilization (SC7), and if the demolition is not advantageous, select the thickness of the unstable layer assumed for the back ground in the display device (8) Is displayed Then, the thickness of the unstable layer is selected from “0.5 m or less”, “0.5 m to 3 m”, or “3.0 m or more” by the input device (7) (SC7), and the total cost for each of them. Is within the determined budget frame (SC8, SC12, SC16), and if it is within the budget frame, back reinforcement work is performed (SC9, SC13, SC17). In the case of “0.5 m or less” and the case of “0.5 m to 3 m”, the back surface reinforcement work (SC9, SC17) includes a fiber reinforced mortar spraying work and a reinforcing steel reinforcement work . Decision method.

Images