JP2019210727A - Natural ground reinforcement structure and construction method thereof, pull-out test equipment - Google Patents

Abstract

To check the fixing condition of a rock bolt and build a natural ground reinforcement structure, and improve workability by eliminating the need to replace test nut and normal nut that are screwed together during the pull-out test for the rock bolt.SOLUTION: A natural ground reinforcement structure comprises rock bolts 1a, 1b driven in the natural ground 101, a normal nut 3 screwed into a male screw 11a projecting from a placement surface 104 of the natural ground 101 of the rock bolt 1a and screwed so that a bearing plate 2a substantially contacts the placement surface 104, and a pull-out test compatible nut 4 different from the normal nut 3 screwed into a male screw 11b protruding from the placement surface 104 of the rock bolt 1b and screwed so that a bearing plate 2b substantially contacts the placement surface 104. The pull-out test-compatible nut 4 is formed in a shape that can be freely fitted into a connector 5 of a pull-out force loading jack 6.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a ground reinforcement structure for supporting a natural ground with a rock bolt placed on a natural ground such as a tunnel, a construction method thereof, and a pull-out test apparatus used for the construction of the natural ground reinforcement structure.

  Conventionally, a lock bolt pull-out test has been performed to confirm that a rock bolt placed in a natural mountain in a mountain tunnel or the like is firmly fixed on the natural mountain. Usually, in the pull-out test of the lock bolt, a center hole jack is extrapolated via a bearing plate to the protruding portion of the lock bolt from the ground, and a test nut is screwed onto the lock bolt from the rear side of the center hole jack. While reading the hydraulic gauge, a stage load is applied to the lock bolt every one ton with a hydraulic pump, and the extension of the lock bolt is read with a dial gauge (see Non-Patent Document 1).

  In addition, it is also known to grasp the extension of the lock bolt 202 driven into the natural ground 201 by the apparatus configuration shown in FIGS. In this device configuration, the tension bar 203 is screwed to the outer periphery of the lock bolt 202, and the pressure bearing plate 204 is externally inserted into the lock bolt 202 and arranged so as to contact the placing surface 205. Further, the angle adjustment pedestal 206 is extrapolated to the tension bar 203 so as to come into contact with the bearing plate 204, and the center hole jack 208 provided with the angle adjustment ball seat 207 at the tip is extrapolated to the tension bar 203. A center hole jack 208 is disposed so as to receive the angle adjusting ball seat 207 by the angle adjusting base 206.

  Then, from the opposite side of the angle adjustment ball seat 207 of the center hole jack 208, the measuring plate 209 and the washer 210 are externally inserted into the tension bar 203 and the test nut 211 is screwed together, and the dial gauge is attached to the center hole jack 208. A measuring element 213 of the dial gauge 212 is brought into contact with a measuring plate 209 attached with 212 and fixed to the tension bar 203. With this device configuration, the hydraulic pump 214 is pressurized while reading the hydraulic gauge 215, the pulling force is loaded on the tension bar 203 and the lock bolt 202 with the center hole jack 208, and the displacement of the measuring plate 209 is measured with the dial gauge 212. To recognize the extension of the lock bolt 202.

[Reference materials] Rock bolt pull-out test, [online], March 12, 2018 search, Internet <URL: http://www.ktr.mlit.go.jp/ktr_content/content/000622591.pdf>

  By the way, in the pull-out test of Non-Patent Document 1, after the lock bolt pull-out test is completed, the test nut on the rear side of the center hole jack is removed, the center hole jack is removed, and a normal nut is newly screwed onto the lock bolt. It is necessary to recombine. 18 and 19, the test nut 211, the washer 210, and the measurement plate 209 are removed after the completion of the lock bolt 202 pull-out test, and the center hole jack 208, the angle adjustment base 206, and the tension bar are removed. After removing 203, it is necessary to re-engage the normal nut 216 with the lock bolt 202 again. Therefore, it takes time and effort to remove the test nut and replace the nut by attaching a normal nut, resulting in a decrease in construction efficiency.

  The present invention is proposed in view of the above-mentioned problems, and can confirm a fixing state of the lock bolt to build a ground reinforcement structure, and is a test nut screwed in a pull-out test for the lock bolt. It is an object of the present invention to provide a natural ground reinforcement structure that can eliminate the need to replace nuts and to improve workability, a construction method thereof, and a drawing test apparatus used for the construction of natural ground reinforcement structures.

The natural ground reinforcing structure of the present invention includes a first lock bolt and a second lock bolt that are driven into the natural ground, and a first male screw that protrudes from the ground mounting surface of the first lock bolt. A normal nut screwed so that the first bearing plate is substantially brought into contact with the placement surface, and a second male screw protruding from the placement surface of the second lock bolt. A pull-out test-compatible nut different from the normal nut screwed so that the second bearing plate is substantially brought into contact with the placing surface, and the pull-out test-compatible nut is a connector for a pull-out force loading jack. It is characterized in that it is formed in a shape that can be freely fitted to the.
According to this, by fitting the connector of the pulling force loading jack to the nut corresponding to the pulling test and performing the pulling test, it is possible to confirm the fixing state of the lock bolt and to build the ground reinforcement structure, A pull-out test-compatible nut that is screwed into the second lock bolt and has the second support plate substantially in contact with the placement surface is left as it is after the pull-out test and used as a nut that performs the same function as a normal bolt. This makes it possible to eliminate the need to replace the test nut and the normal nut that are screwed together during the pull-out test for the lock bolt, thereby improving the workability. Furthermore, by forming the nut for pull-out test in a shape that can be fitted to the connector of the pull-out force loading jack, it is not necessary to install a tension bar that extends from the lock bolt, which also simplifies the construction work. The workability can be improved, and the construction cost can be reduced by reducing the number of parts of the pull-out test apparatus.

The natural ground reinforcement structure of the present invention is characterized in that the pull-out test-compatible nut is provided with a fitting portion that can be fitted into the coupling tool by the rotation of the coupling tool.
According to this, the connecting tool of the pulling force loading jack can be easily fitted to the nut corresponding to the pulling test by the rotation operation of the connecting tool of the pulling force loading jack, and the fitting can be released. The removal work can be facilitated. Accordingly, it is possible to facilitate the other components of the pulling test apparatus such as an angle adjustment base provided around the pulling force loading jack, and the installation and removal work of the entire pulling test apparatus. In particular, when the lock bolt is driven sideways or upward on the inner peripheral surface of the tunnel, the merit of facilitating these operations becomes remarkable.

In the construction method of the natural ground reinforcement structure of the present invention, the first lock bolt is driven into the natural ground, and a normal nut is attached to the first male screw of the first lock bolt protruding from the ground mounting surface. The first support pressure plate interposed between the placement surface and the normal nut is substantially brought into contact with the placement surface, and the second lock bolt is placed on the ground. A nut corresponding to a drawing test different from the normal nut is screwed into a second male screw of the second lock bolt protruding from the setting surface, and is interposed between the setting surface and the nut corresponding to the drawing test. A first step of causing the second bearing plate to substantially abut against the placement surface; and fitting the coupling tool to the pull-out test-corresponding nut having a shape that can be fitted to the coupling tool of the pull-out force loading jack; With the pulling force loading jack, the second tool is connected to the second through the pulling test corresponding nut. A second step in which a pulling force is loaded on the bolt and a pulling test is performed; and after the pulling test is completed, the nut corresponding to the pulling test is left screwed onto the second lock bolt, and the fitting is It is characterized by comprising a third step of releasing the wearing state and removing the connector and the pulling force loading jack.
According to this, for example, a pull-out test is performed at an arbitrary time together with the operation of driving the first and second lock bolts, and in parallel with the operation of driving the first and second lock bolts. A pull-out test can be performed on another second lock bolt that has already been driven, and the degree of freedom of the pull-out test work and construction work can be increased. In addition, a pull-out test can be performed by fitting a pull-out force loading jack connector to a pull-out test-compatible nut, thereby confirming the fixing state of the lock bolt and constructing a ground reinforcement structure. It becomes possible to use the nut corresponding to the pull-out test that is screwed to the lock bolt and has the second bearing plate substantially in contact with the placement surface as it is to be left as it is after the pull-out test, and to function as a normal bolt. There is no need to replace the nuts for testing and normal nuts that are screwed together in the pull-out test for the lock bolt, and the workability can be improved. Furthermore, by forming the nut for pull-out test in a shape that can be fitted to the connector of the pull-out force loading jack, it is not necessary to install a tension bar that extends from the lock bolt, which also simplifies the construction work. The workability can be improved, and the construction cost can be reduced by reducing the number of parts of the pull-out test apparatus.

The construction method of the natural ground reinforcement structure of the present invention is characterized in that the pulling force loading jack is a pulling cylinder jack.
According to this, by using the pulling force loading jack as a pulling cylinder jack, the pulling force loading jack can be reduced in weight and size, and the attaching operation and the removing operation of the pulling force loading jack can be facilitated. Accordingly, it is possible to facilitate the other components of the pulling test apparatus such as an angle adjustment base provided around the pulling force loading jack, and the installation and removal work of the entire pulling test apparatus. In particular, when the lock bolt is driven sideways or upward on the inner peripheral surface of the tunnel, the merit of facilitating these operations becomes remarkable. Further, the cost required for the pulling force loading jack can be reduced.

The construction method of the ground reinforcement structure according to the present invention includes a pressure detecting unit that detects a hydraulic pressure input to the pulling force loading jack, and a second lock on which the pulling force is loaded. A displacement detection unit for detecting the displacement of the bolt is provided, and a data transmission processing unit is provided. In the second step, the data transmission processing unit corresponds to the pressure data acquired from the pressure detection unit or the pressure. The load data to be transmitted is wirelessly transmitted to the data recording device, and the displacement data of the second lock bolt acquired from the displacement detector is wirelessly transmitted to the data recording device.
According to this, in the existing pull-out test, at least two workers were required to read the oil pressure with the hydraulic gauge and the worker to read the displacement of the lock bolt, whereas one worker was a hydraulic pump. The same operator loads and displaces from the pressure data that is loaded with the pulling force and is wirelessly transmitted to the data recording device, or the load data that is generated from the pressure data and wirelessly transmitted, and the displacement data that is wirelessly transmitted to the data recording device. Therefore, even a single operator can perform the pull-out test efficiently and accurately. In addition, the drawing test record can be recorded and stored in the data recording device on the spot. In addition, since data is wirelessly transmitted from the data transmission processing unit to the data recording device, wiring work for connecting the data recording device and the data transmission processing unit is not necessary. In addition, by installing a pressure detection unit and a displacement detection unit in the pull-out force loading jack, it is not necessary to install a separate displacement meter, etc., and the installation and removal operations of the entire pull-out test device can be facilitated. .

The construction method of the natural ground reinforcement structure of the present invention is characterized in that the data transmission processing unit is accommodated in a waterproof case.
According to this, even when it is installed outdoors in a mountain tunnel or rainy weather with a lot of water leakage, the waterproof case prevents water from entering the data transmission processing section, and conducts a pull-out test and records data stably. be able to.

The pull-out test apparatus according to the present invention is a pull-out test apparatus used in the construction of the natural ground reinforcing structure according to the present invention, and includes a pull-out force loading jack for loading a pulling force on the second lock bolt and the pull-out test corresponding nut. A connector for the pulling force loading jack that is fitted to the pulling force loading jack; a pressure detection unit that detects a hydraulic pressure input to the pulling force loading jack; and a pulling force loading jack. The data transmission process includes: a displacement detection unit that detects a displacement of the second lock bolt that is internally mounted and on which a pulling force is loaded; a data transmission processing unit that is attached to the pulling force loading jack; and a data recording device. Before wirelessly transmitting pressure data acquired from the pressure detection unit or load data corresponding to the pressure to the data recording device and acquired from the displacement detection unit. The data of the displacement of the second locking bolt, characterized in that wirelessly transmits to the data recording device.
According to this, in the existing pull-out test, at least two workers were required to read the oil pressure with the hydraulic gauge and the worker to read the displacement of the lock bolt, whereas one worker was a hydraulic pump. The same operator loads and displaces from the pressure data that is loaded with the pulling force and is wirelessly transmitted to the data recording device, or the load data that is generated from the pressure data and wirelessly transmitted, and the displacement data that is wirelessly transmitted to the data recording device. Therefore, even a single operator can perform the pull-out test efficiently and accurately. In addition, the drawing test record can be recorded and stored in the data recording device on the spot. In addition, since data is wirelessly transmitted from the data transmission processing unit to the data recording device, wiring work for connecting the data recording device and the data transmission processing unit is not necessary. In addition, by installing a pressure detection unit and a displacement detection unit in the pull-out force loading jack, it is not necessary to install a separate displacement meter, etc., and the installation and removal operations of the entire pull-out test device can be facilitated. .

  According to the present invention, it is possible to construct a ground reinforcement structure by confirming the fixing state of the lock bolt, and to replace the nut for testing and the normal nut that are screwed together in the pull-out test for the lock bolt. The necessity can be eliminated and workability can be improved.

The longitudinal section explanatory drawing of the natural ground reinforcement structure of embodiment by this invention. Sectional drawing of the principal part of the natural ground reinforcement structure of embodiment. (A) is a front view of the nut corresponding to a drawing test used for the ground reinforcement structure of the embodiment, and (b) is a cross-sectional view taken along the line AA in FIG. (A) is a front view of the connector of the drawing force loading jack used when constructing the natural ground reinforcement structure of embodiment, (b) is the BB sectional drawing of the figure (a). (A) is a perspective view of a nut corresponding to a pull-out test, (b) is a perspective view of a connector of a pull-out force loading jack. The perspective explanatory view explaining the operation | movement which fits the coupling tool of a drawing test corresponding | compatible nut and a drawing force loading jack. (A)-(c) is front explanatory drawing explaining the operation | movement which fits the coupling tool of a drawing test corresponding | compatible nut and a drawing force loading jack, (d) is the CC sectional expanded sectional view of the figure (c). The perspective exploded explanatory drawing explaining attachment of the coupling tool of the pull-out test corresponding nut and pull-out force loading jack screwed into the lock bolt. (A)-(c) is sectional explanatory drawing explaining the construction procedure which performs a pull-out test to the lock bolt in which the pull-out test corresponding nut was screwed, removes a pull-out test apparatus, and leaves a pull-out test corresponding nut. Explanatory drawing which shows the state which installed the pull-out test apparatus in the lock bolt in which the pull-out test corresponding nut was screwed together. The partial cross-section enlarged side view which shows the circumference | surroundings of the pull cylinder jack in the state which installed the pull-out test apparatus in the lock bolt in which the pull-out test corresponding nut was screwed together. The expanded sectional view which shows the circumference | surroundings of the pull cylinder jack in the state which installed the pull-out test apparatus in the lock bolt in which the pull-out test corresponding nut was screwed together. The block diagram of the data recording device in a drawing test apparatus. (A) is a perspective view of another example of a pull-out test-compatible nut used in the natural ground reinforcing structure of the embodiment, and (b) is a perspective view of a connector of another example of a pull-out force loading jack. Explanatory perspective drawing explaining the operation | movement which fits the coupling tool of another example pull-out test corresponding | compatible nut and another example pull-out force loading jack. The perspective exploded explanatory drawing explaining attachment of the coupling tool of another example pull-out test corresponding nut screwed into a lock bolt, and another pull-out force loading jack. The expanded sectional view corresponding to Drawing 12 at the time of using the pulling cylinder jack of a modification. Explanatory drawing which shows the conventional pull-out test apparatus of a lock bolt. (A)-(c) is a partial cross-section explanatory drawing explaining the construction procedure which performs a pull-out test to a lock bolt with the conventional lock bolt pull-out test apparatus, removes a pull-out test apparatus, and re-engages a normal nut.

[Embodiment natural ground reinforcement structure and construction method thereof]
As a natural ground reinforcing structure according to an embodiment of the present invention, a structure for reinforcing a natural ground 101 of a tunnel is shown in FIGS. In this natural ground reinforcing structure, the shotcrete 103 is provided on the inner peripheral surface of the natural ground 101 on the tunnel space 102 side, and the inner peripheral surface of the shotcrete 103 corresponds to the placement surface of the natural mountain 101 and the lock bolts 1a and 1b. This is the casting surface 104. Perforations 105 are formed in the shotcrete 103 and the ground 101 so as to be substantially orthogonal to the placement surface 104, and lock bolts 1a and 1b are provided in the perforations 105 and a fixing material such as a cement mortar type fixing material. 106 is filled. In addition, 107 in FIG. 1 is a secondary lining concrete.

  A lock bolt 1a corresponding to the first lock bolt and a lock bolt 1b corresponding to the second lock bolt placed on the ground 101 and the shotcrete 103 are respectively provided at the rear end portion from the rear end surface to the inside of the perforation 105. Male screws 11a and 11b are formed to reach the length. The lock bolts 1a and 1b corresponding to the first and second lock bolts in the present embodiment are the same rod-shaped members in shape, structure and size, but may be members of different shapes, structures or sizes. It is.

  A support plate 2a corresponding to the first support plate is inserted through the insertion hole 21a into the male screw 11a protruding from the placement surface 104 of the lock bolt 1a, and the male screw 11b protruding from the placement surface 104 of the lock bolt 1b A support plate 2b corresponding to the second support plate is inserted through the insertion hole 21b. The support plates 2a and 2b corresponding to the first and second support plates in the present embodiment are the same plate-like members in shape, structure and size, and square washers and the like are used as the support plates 2a and 2b. It is also possible to use members of different shapes, structures or sizes.

  A normal nut 3 such as a normal hexagon nut is screwed into the male screw 11a protruding from the placement surface 104 of the lock bolt 1a, and is screwed so that the bearing plate 2a is substantially in contact with the placement surface 104. . Further, a pull-out test-compatible nut 4 different from the normal nut 3 is screwed into the male screw 11b protruding from the placing surface 104 of the lock bolt 1b, and is screwed so that the bearing plate 2b is substantially in contact with the placing surface 104. It has been entered.

  The pull-out test-compatible nut 4 is formed in a shape that can be freely fitted to a connector 5 of a pull-out force loading jack 6 to be described later, and as shown in FIGS. 2, 3, and 5 to 8, A substantially fan-shaped wing portion 44 is provided on the rear portion 43 of the base body 41 so as to protrude in the radial direction. A pair of wings 44 are provided at corresponding positions, and the pair of wings 44 and 44 are formed so as to protrude to the opposite sides. A protrusion 45 projecting forward is locally formed at a predetermined position on the front surface of each wing portion 44, and the protrusion 45 in this example is formed near the end of the front surface of the wing portion 44. The protrusion 45 and the protrusion 45 of the other wing part 44 are provided at corresponding positions.

  As shown in FIGS. 4 to 8, the connector 5 has a screw hole 52 formed in the rear part of the substantially cylindrical base 51, and a keyhole-shaped mounting hole in the front part of the base 51. 53 is formed. The rear portion 54 of the mounting hole 53 is a circular hollow, and the diameter of the rear portion 54 is slightly larger than the diameter of the circle extending the arcuate outer peripheral edge of the wing portion 44 of the pull-out test compatible nut 4. The thickness of the hollow rear portion 54 in the axial direction is slightly larger than the thickness of the wing portion 44.

  The front portion 55 of the mounting hole 53 is formed in a substantially similar shape corresponding to the rear portion 43 having the wing portion 44 of the pull-out test-compatible nut 4, and a substantially fan-shaped protruding portion 56 is formed to protrude inwardly. The protruding portions 56 are arranged to face each other. A fitting hole 57 having a shape and a size corresponding to the protrusion 45 of the pull-out test support nut 4 is locally formed at a predetermined position on the rear surface of each protruding portion 56. The fitting hole 57 in this example protrudes. The fitting hole 57 of one protrusion 56 and the fitting hole 57 of the other protrusion 56 are provided at corresponding positions, and are formed near the end of the rear surface of the portion 56, and a pair of fitting holes 57. 57 is provided at a position corresponding to the pair of protrusions 45 of the pull-out test support nut 4. A portion of the front portion 55 without the protruding portion 56 is formed to have the same diameter as the rear portion 54 and is continuous with the rear portion 54.

  When fitting the connector 5 to the pull-out test corresponding nut 4, as shown in FIGS. 6 and 7, the shapes of the front portion 55 of the substantially similar mounting hole 53 and the rear portion 43 of the pull-out test corresponding nut 4 are set. In this manner, the connecting tool 5 is extrapolated from the rear 43 side of the pull-out test corresponding nut 4 so that most of the pull-out test corresponding nut 4 is inserted into the mounting hole 53. Then, the connector 5 is rotated so that the protrusions 56 and 56 and the wings 44 and 44 of the pull-out test-compatible nut 4 overlap each other, and the position of the pair of fitting holes 57 and 57 of the connector 5 and the pull-out test. It rotates until the position of a pair of protrusions 45 and 45 of the corresponding nut 4 is aligned (refer to the thick arrow in FIG. 7). When the position of the pair of fitting holes 57 and 57 and the position of the pair of protrusions 45 and 45 are matched, the fitting holes 57 and 57 and the protrusions 45 and 45 are respectively fitted, and the fitting hole 57 and the protrusion 45 are fitted. Thus, the connector 5 and the pull-out test-compatible nut 4 are fitted. This fitting can be easily removed by rotating the connector 5 so as to shift the position of the pair of fitting holes 57, 57 and the position of the pair of protrusions 45, 45, and is detachable. .

  In other words, the pull-out test support nut 4 of this example is provided with a projection 45 as a fitting portion that can be fitted into the connection tool 5 by the rotation of the connection tool 5, and the pull-out test support nut 4 is connected to the pull-out force loading jack 6. In other words, the protrusion 45 of the nut 4 corresponding to the pull-out test, which is a key, is key-fitted to the fitting hole 57 of the connector 5 so as to be freely fitted. ing. In this example, the projection 45 corresponding to the fitting portion and the two fitting holes 57 corresponding to the fitted portion to which the fitting portion is fitted are provided in pairs. May be provided with a predetermined interval, or may be provided one by one.

  Further, when fitting the connector 5 to the pull test nut 4 when performing the pull test, as shown in FIGS. 8 and 9A, the support plate 2b externally attached to the lock bolt 1b is used. A substantially annular angle adjustment pedestal 7 is arranged on the outer periphery of the nut 4 for pulling test that is screwed so as to be substantially in contact with the placing surface 104. A plurality of magnets 71 are provided on the angle adjusting pedestal 7 on the bearing plate 2b side at predetermined intervals in the circumferential direction, and are detachably magnetically attached to the bearing plate 2b made of a magnetic material (see FIG. 9B). ). The angle adjusting pedestal 7 is formed with a receiving portion 72 having a substantially tapered surface that receives the angle adjusting ball seat 61 provided at the front end portion of the pulling force loading jack 6 on the side opposite to the bearing plate 2b side. ing.

  Thereafter, the connecting tool 5 attached to the inside of the front end portion of the pull-out force loading jack 6 is extrapolated from the rear portion 43 side of the pull-out test corresponding nut 4, and the pull-out force loading jack 6 and the connecting tool 5 are rotated to connect the connecting tool 5. The pull-out test support nut 4 is fitted and the angle adjustment ball seat 61 of the pull-out force loading jack 6 is brought into contact with the receiving portion 72 of the angle adjustment base 7, and the pull-out force loading jack 6 constituting the pull-out test device is arranged. . Here, the angle adjusting ball seat 61 is configured to abut on the angle adjusting base 7 so that the angle can be adjusted, and by this angle adjustment, even if the placing surface 104 is uneven, the lock bolt 1b, the pull-out test corresponding nut 4, the coupling tool. 5. The pulling force loading jack 6 can be installed so that the central axes are aligned.

  Next, the procedure for constructing the ground reinforcement structure of the present embodiment will be described. When constructing the natural ground reinforcement structure of the present embodiment, a fixing material 106 that hardens in a predetermined time such as cement mortar (not shown) is injected into the perforations 105 formed in the natural ground 101 and the shotcrete 103. Then, the lock bolt 1 a corresponding to the first lock bolt is driven into the perforation 105, and the lock bolt 1 a is driven on the ground 101 and the shotcrete 103 so as to be fixed by the fixing material 106. Then, the external thread 11a of the lock bolt 1a protruding from the placement surface 104 of the lock bolt 1a is sequentially inserted with the support plate 2a corresponding to the first support plate, and the normal nut 3 is screwed in order. By screwing, the bearing plate 2a interposed between the placing surface 104 and the normal nut 3 is brought into substantially contact with the placing surface 104 (see FIG. 2).

  Further, a fixing material similar to the above is injected into a perforation 105 formed separately from the perforation 105 into which the lock bolt 1 a is driven, and a lock bolt 1 b corresponding to a second lock bolt is driven into the perforation 105, thereby fixing the fixing material 106. The lock bolt 1b is placed on the ground 101 and the shotcrete 103 so as to be fixed. Then, extrapolation of the support plate 2b corresponding to the second support plate is inserted into the male screw 11b of the lock bolt 1b protruding from the placement surface 104 of the lock bolt 1b, and a pull-out test compatible nut 4 different from the normal nut 3 is screwed. Then, the support plate 2b interposed between the placing surface 104 and the pulling test corresponding nut 4 is brought into substantially contact with the placing surface 104 by screwing the pulling test supporting nut 4 (see FIG. 2).

  Thereafter, as described above, a substantially annular angle adjustment pedestal 7 is arranged on the outer periphery of the pull-out test support nut 4, and the connector 5 attached to the pull-out force loading jack 6 is connected to the pull-out test support nut 4 from the rear 43 side. Extrapolation, the pulling force loading jack 6 and the connecting tool 5 are rotated to fit the connecting tool 5 and the pulling test corresponding nut 4, and the pulling force loading jack 6 constituting the pulling test device is arranged (FIGS. 7 to 7). 12).

  The pulling force loading jack 6 in the present embodiment is a single-acting pulling cylinder jack that outputs a pulling force by a hydraulic cylinder. In the illustrated example, an angle adjusting ball seat 61 having a substantially partial spherical shape is provided at the tip. A spring having a cylinder main body 62, a plunger 63 that is housed in the cylinder main body 62, retreats by input of hydraulic pressure, and a return spring 64 that is provided on the rear side of the plunger 63 and returns the retracted plunger 63 to the initial position. It is a return-type pull cylinder jack. A male screw 631 is formed at the front end of the plunger 63, and when the male screw 631 and the female screw of the screw hole 52 of the connector 5 are screwed together, the connector 5 is brought into the inside of the distal end portion of the pulling force loading jack 6. It is attached. Further, the pulling force loading jack 6 is connected to a hydraulic pump 66 that hydraulically drives the pulling force loading jack 6 via a hydraulic hose 65, as shown in FIG. The illustrated hydraulic pump 66 is a rechargeable portable electric hydraulic pump.

  The pulling force loading jack 6 includes a pressure detection unit 81 that detects the pressure of the hydraulic pressure input to the pulling force loading jack 6 and a displacement detection unit 82 that detects the displacement of the lock bolt 1b loaded with the pulling force. In addition, a data transmission processing unit 83 is attached. The data transmission processing unit 83 is accommodated in a waterproof case 84 made of an acrylic plate or the like, and is waterproofed so that water does not enter the data transmission processing unit 83.

  When a pulling force is loaded on the lock bolt 1b, the data transmission processing unit 83 generates load data corresponding to the pressure from the pressure data acquired from the pressure detection unit 81, and the load data is stored in the data recording device. 9 is transmitted wirelessly in substantially real time or the like, and the displacement data of the lock bolt 1b acquired from the displacement detector 82 is wirelessly transmitted to the data recording device 9 in substantially real time or the like. The data transmission processing unit 83 may be configured to wirelessly transmit the pressure data acquired from the pressure detection unit 81 to the data recording device 9 in substantially real time, instead of generating and transmitting the load data described above. It is.

  The data recording device 9 to which data is wirelessly transmitted from the data transmission processing unit 83 is configured by, for example, a smartphone, a portable information terminal, a personal computer, or the like. As shown in FIG. 13, a control unit 91 such as a CPU, a memory, a hard disk, or the like Storage unit 92, an input unit 93 such as a touch panel, a keyboard and a mouse, an image display unit 94 such as a touch panel and a liquid crystal display, and a communication unit 95 of a wireless communication interface. The storage unit 92 includes a program storage unit 921 for storing an application program such as a pull-out test processing program for processing data received from the operation system and the data transmission processing unit 83, and data received from the data transmission processing unit 83 and a pull-out test. A data storage unit 922 that stores data generated by the processing program is provided.

  The pulling force loading jack 6 connected to the hydraulic pump 66 and provided with the data transmission processing unit 83 or the data recording device 9 constitutes the pulling test device, and the pulling force loading jack 6 is hydraulically operated by the hydraulic pump 66. The pulling force is loaded onto the lock bolt 1b corresponding to the second lock bolt via the connector 5 and the pull-out test corresponding nut 4 by the pull-out force loading jack 6, and a pull-out test is performed (FIG. 9A). (Refer to FIGS. 10-12).

  During this pull-out test, for example, the pressure detector 81 continuously detects the pressure of the hydraulic pressure input to the pull-out force loading jack 6, and a storage unit including a control unit such as a CPU, a program storage unit, and a data storage unit is provided. The data of the detected pressure is continuously input to the data transmission processing unit 83 provided, and the data transmission processing unit 83 continuously generates the data of the load corresponding to this pressure from the input pressure data. The load data thus transmitted is continuously transmitted to the data recording device 9 in substantially real time or the like. At the same time, the displacement detector 82 continuously detects the displacement of the lock bolt 1b generated by the loading of the pulling force, and the data of the detected displacement is continuously input to the data transmission processor 83 to perform the data transmission process. The unit 83 continuously transmits the input displacement data to the data recording device 9 in substantially real time or the like. The data recording device 9 continuously receives load data and displacement data from the data transmission processing unit 83 in substantially real time, stores the load data and displacement data in the data storage unit 922, and Load-displacement relationship information such as a graph indicating the displacement relationship is generated and displayed on the image display unit 94.

  In the configuration in which the data transmission processing unit 83 transmits the pressure data to the data recording device 9 as it is, for example, the data transmission processing unit 83 continues the input pressure data to the data recording device 9 in substantially real time. In addition to wireless transmission, the input displacement data is continuously wirelessly transmitted to the data recording device 9 in substantially real time. The data recording device 9 continuously receives load data and displacement data from the data transmission processing unit 83 in substantially real time, and continuously generates load data corresponding to the pressure from the received pressure data. The generated load data and displacement data are respectively stored in the data storage unit 922, and load / displacement relationship information such as a graph indicating the relationship between the load and the displacement is generated and displayed on the image display unit 94.

  After the completion of the pull-out test, as shown in FIGS. 9B and 9C, the pull-out test-corresponding nut 4 is left screwed into the lock bolt 1b corresponding to the second lock bolt, and the coupling tool 5 is left. Is released, and the connector 5, the pulling force loading jack 6 and the angle adjusting base 7 are removed. Release of the fitting state of the connector 5 from the pull-out test-compatible nut 4 is achieved by rotating the connector 5 and fitting the fitting 45 corresponding to the fitting portion in which the protrusion 45 corresponding to the fitting portion is fitted. The fitting with the hole 57 is released, the protrusion 56 of the connector 5 is rotated until it is arranged in a portion where the wing portion 44 of the pull-out test corresponding nut 4 is not present, and the nut corresponding to the pull-out test from the mounting hole 53 of the connector 5. This is done by removing the connector 5 so that 4 is detached.

  When the lock bolt 1b is displaced by the pull-out test and the bearing plate 2b is separated from the placing surface 104, the pull-out test corresponding nut 4 is screwed into the placing surface 104 side to The bearing support plate 2b interposed between the nut 4 corresponding to the pull-out test is brought into substantially contact with the placing surface 104, and a natural ground reinforcing structure is constructed (see FIG. 2).

  According to the present embodiment, the coupling bolt 5 of the pulling force loading jack 6 is fitted to the nut 4 corresponding to the pulling test, and the pulling test is performed. The pull-out test-compatible nut 4 that is screwed to the lock bolt 1b and makes the bearing plate 2b substantially in contact with the placement surface 104 is left as it is after the pull-out test, and the same function as that of the normal bolt 3 is achieved. Therefore, it is possible to eliminate the necessity of replacing the test nut and the normal nut that are screwed together during the pull-out test with respect to the lock bolt 1b, thereby improving the workability. Furthermore, by forming the pull-out test compatible nut 4 in a shape that can be fitted to the connector 5 of the pull-out force loading jack 6, it is not necessary to install a tension bar that extends from the lock bolt 1b. As a result, it is possible to improve the workability by reducing the number of parts of the pull-out test apparatus and reduce the construction cost.

  Further, by providing the pull-out test-compatible nut 4 with a protrusion 45 that is a fitting portion that can be freely fitted to the connector 5 by the rotation of the connector 5, the connector 5 can be easily fitted into the pull-out test-compatible nut 4. Also, the fitting can be released, and the attachment work and the removal work of the connector 5 and the pulling force loading jack 6 can be facilitated. Therefore, other components of the pulling test apparatus such as the angle adjusting pedestal 7 provided around the pulling force loading jack 6 and installation work and removal work of the entire pulling test apparatus can be facilitated. In particular, when the lock bolts 1a and 1b are driven sideways or upward on the driving surface 104 on the inner peripheral surface of the tunnel, the merits of facilitating these operations become remarkable.

  Moreover, according to the construction method of the natural ground reinforcement structure of this embodiment, a pull-out test is performed at an arbitrary time together with the operation of driving the lock bolts 1a and 1b, and the lock bolts 1a and 1b are driven. In parallel with the work, it is possible to perform a pull-out test on another lock bolt 1b that has already been driven, and the degree of freedom of the pull-out test work and construction work can be increased.

  Further, by using the pulling force loading jack 6 as a pulling cylinder jack, the pulling force loading jack 6 can be reduced in weight and size, and attachment and removal operations of the pulling force loading jack 6 can be facilitated. Therefore, other components of the pulling test apparatus such as the angle adjusting pedestal 7 provided around the pulling force loading jack 6 and installation work and removal work of the entire pulling test apparatus can be facilitated. In particular, when the lock bolts 1a and 1b are driven sideways or upward on the driving surface 104 on the inner peripheral surface of the tunnel, the merits of facilitating these operations become remarkable. Furthermore, the cost required for the pulling force loading jack 6 can be reduced.

  In addition, the data transmission processing unit 83 wirelessly transmits load or pressure data and displacement data to the data recording device 9 in substantially real time or the like. Whereas at least two workers who read the displacement are required, one worker loads the pulling force with the hydraulic pump 66, and the load transmitted wirelessly to the data recording device 9 in substantially real time or the like. Based on the pressure data and the displacement data, the same worker can confirm the relationship information between the load and the displacement, and even one worker can perform the pull-out test efficiently and accurately. In addition, a record of the pull-out test can be recorded and stored in the data recording device 9 on the spot. Further, since data is wirelessly transmitted from the data transmission processing unit 83 to the data recording device 9, wiring work for connecting the data recording device 9 and the data transmission processing unit 83 is not necessary. Further, by installing the pressure detection unit 81 and the displacement detection unit 82 in the pulling force loading jack 6, it is not necessary to separately install a displacement meter or the like, thereby facilitating the installation and removal operations of the entire pulling test apparatus. be able to.

  In addition, by housing the data transmission processing unit 83 in the waterproof case 74, it is possible to prevent the water from entering the data transmission processing unit 83 and stabilize it even when it is installed outdoors in a mountain tunnel or rainy weather with much water leakage. Pull-out test and data recording.

[Included scope of the invention disclosed herein]
In addition to the inventions and embodiments listed as inventions, the invention disclosed in the present specification is specified by changing these partial contents to other contents disclosed in the present specification, to the extent applicable. Or those specified by adding other contents disclosed in the present specification to those contents, or those specified by deleting these partial contents to the extent that partial effects can be obtained and making them higher-level concepts Include. The invention disclosed in this specification includes the following modified examples and added contents.

  For example, the shape that can be freely fitted to the connector of the pull test test nut according to the present invention is not limited to the shape having the protrusion 45 of the pull test test nut 4, and is suitable, for example, the pull test test nut shown in FIGS. It is good also as a 4m shape. The pull-out test corresponding nut 4m has a base body 41m in which a screw hole 42m is formed over the entire length, and is provided with a substantially fan-shaped wing portion 43m that protrudes in the radial direction over the entire length of the base body 41m. A pair of wings 43m are provided at corresponding positions, and the pair of wings 43m and 43m are formed so as to protrude on opposite sides.

  A fitting groove 44m is formed in the circumferential direction on the outer peripheral surface of the wing portion 43m, and a plurality (two in the illustrated example) are provided at intervals in the length direction of the nut 4m for pulling test. The fitting groove 44m is formed so as to open at one side end face of the wing portion 43m, and is formed to a position not reaching the other side end face of the wing portion 44m. The plurality of fitting grooves 44m arranged in the vertical direction are formed so that the open sides are aligned. The open side of the fitting groove 44m of one wing portion 43m and the open side of the fitting groove 44m of the other wing portion 43m are in the same direction in the circumferential direction.

  A screw hole 52m is formed in a rear portion of the substantially cylindrical base 51m and a mounting hole 53m is formed in a front portion of the base 51m in the connector 5m fitted to the pull test nut 4m. The diameter of the mounting hole 53m is slightly larger than the diameter of a circle obtained by extending the arcuate outer periphery of the wing portion 43m of the pull-out test-compatible nut 4m. A protrusion 54m having a length substantially corresponding to the fitting groove 44m is formed in the circumferential direction at a position opposed to the inner peripheral surface of the mounting hole 53m, and a distance corresponding to the fitting groove 44m in the length direction of the connector 5m. A plurality (two in the illustrated example) of protrusions 54m corresponding to the fitting grooves 44m are provided.

  When fitting the connector 5m to the pull-out test-compatible nut 4m, the portion of the pull-out test-compatible nut 4m that does not have the wing 43m corresponds to the portion of the connector 5m that has the protrusion 54m. The connecting tool 5m is extrapolated from the rear side of the nut 4m, and the most part of the pull-out test corresponding nut 4m is inserted into the mounting hole 53m. Then, the connecting tool 5m is rotated to fit the protrusion 54m of the connecting tool 5m from the open side of the fitting groove 44m of the pull-out test-compatible nut 4m, and the protrusion 54m and the fitting groove 44m are fitted (thick line in FIG. 15). See arrow). This fitting can be released by rotating the connector 5m in the reverse direction to release the fitting between the protrusion 54m and the fitting groove 44m, and is detachable.

  That is, the nut 4m corresponding to the pull-out test of the other example is provided with a fitting groove 44m as a fitting portion that can be fitted into the connecting tool 5m by the rotation of the connecting tool 5m, and connected as a fitted portion corresponding to this. The protrusion 54m of the tool 5m is provided. Another example of the pull-out test compatible nut 4m and another example of the connecting tool 5m can be used in the same manner as the pull-out test compatible nut 4 and the connecting tool 5 of the above-described embodiment (see FIG. 16).

  As a modification of the connector 5 and the pulling force loading jack 6, as shown in FIG. 17, the connector 5 n is provided with a locking pin 58 n protruding from the outer peripheral surface of the base 51, and A pulling force loading jack 6n provided with a guide groove 67n extending in the axial direction on the peripheral surface and opened by the angle adjusting ball seat 61 may be used. In this modification, the rotation prevention pin 58n is engaged with the guide groove 67n to prevent rotation of the coupling tool 5n, and the screwed state between the screw hole 52 of the coupling tool 5n and the male screw 631 of the plunger 63 is reliably maintained. At the same time, the connecting tool 5n is an integrated part in which the pulling force loading jack 6n cannot be detached. On the other hand, according to the structure which obtains the fixed state of a coupling tool and the plunger 63 only by screwing with the male screw 631 of the plunger 63 like the coupling tools 5 and 5m, since a coupling tool is detachable, It is possible to flexibly attach a coupling tool corresponding to various types of pull-out test compatible nuts, and the degree of freedom in pull-out tests and construction can be increased.

  Moreover, the natural ground reinforcement structure of this invention can be used as a natural ground reinforcement structure other than the reinforcement structure of the tunnel of the said embodiment. In addition, the first and second lock bolts, the first and second bearing plates in the present invention may have the same configuration, or may have different configurations. Moreover, the placement surface of the natural ground in the present invention includes a placement surface where the natural ground is directly exposed, in addition to a placement surface such as shotcrete provided on the inner periphery of the natural ground. In addition, as the pulling force loading jack in the present invention, an appropriate one other than the pulling cylinder jack can be used as far as it can be applied. For example, a double acting cylinder jack that pushes and pulls hydraulically can be used. Is possible.

  The present invention can be used, for example, when constructing a ground reinforcement structure in a tunnel or the like.

DESCRIPTION OF SYMBOLS 1a, 1b ... Lock bolt 11a, 11b ... Male screw 2a, 2b ... Supporting plate 21a, 21b ... Insertion hole 3 ... Normal nut 4 ... Pull-out test corresponding nut 41 ... Base | substrate 42 ... Screw hole 43 ... Rear part 44 ... Wing part 45 ... Protrusion 4m ... Nuts for pull-out test 41m ... Base 42m ... Screw hole 43m ... Wing 44m ... Fitting groove 5 ... Connector 51 ... Base 52 ... Screw hole 53 ... Mounting hole 54 ... Rear 55 ... Front 56 ... Projection 57 ... Fitting hole 5m ... Connector 51m ... Substrate 52m ... Screw hole 53m ... Mounting hole 54m ... Projection 5n ... Connector 58n ... Non-rotating pin 6 ... Pulling force loading jack 61 ... Angle adjustment ball seat 62 ... Cylinder body 63 ... Plan Jar 631 ... Male screw 64 ... Return spring 65 ... Hydraulic hose 66 ... Hydraulic pump 6n ... Pulling force loading jack 67n ... Guide groove 7 ... Angle adjustment base 71 Magnet 72 ... Receiving unit 81 ... Pressure detection unit 82 ... Displacement detection unit 83 ... Data transmission processing unit 84 ... Waterproof case 9 ... Data recording device 91 ... Control unit 92 ... Storage unit 921 ... Program storage unit 922 ... Data storage unit 93 ... Input unit 94 ... Image display unit 95 ... Communication unit 101 ... Ground mountain 102 ... Tunnel space 103 ... Shotcrete 104 ... Placing surface 105 ... Perforation 106 ... Fixing material 107 ... Secondary lining concrete 201 ... Ground mountain 202 ... Rock bolt DESCRIPTION OF SYMBOLS 203 ... Tension bar 204 ... Supporting plate 205 ... Placing surface 206 ... Angle adjustment base 207 ... Angle adjustment ball seat 208 ... Center hole jack 209 ... Measuring plate 210 ... Washer 211 ... Test nut 212 ... Dial gauge 213 ... Measuring element 214 ... Hydraulic pump 215 ... Hydraulic gauge 216 ... Normal nut

Claims (6)

A first lock bolt and a second lock bolt placed in a natural ground;
A normal nut screwed into a first male screw projecting from the ground face placement surface of the first lock bolt and screwed so that the first bearing plate is substantially in contact with the placement surface; ,
Different from the normal nut screwed into the second male screw projecting from the placement surface of the second lock bolt and screwed so that the second support plate is substantially in contact with the placement surface. With a pull-out test compatible nut,
2. A natural ground reinforcing structure, wherein the pull-out test-compatible nut is formed in a shape that can be fitted into a connector of a pull-out force loading jack.   2. The natural ground reinforcement structure according to claim 1, wherein the pull-out test nut is provided with a fitting portion that can be fitted into the coupling tool by a rotation operation of the coupling tool. A first lock bolt is driven into a natural ground, and a normal nut is screwed into a first male screw of the first lock bolt projecting from the natural ground placement surface. The first lock plate interposed between the nut and the first support plate is substantially brought into contact with the placement surface, and the second lock bolt is placed on the ground and the second lock protrudes from the placement surface. A nut corresponding to a pull-out test different from the normal nut is screwed into a second male screw of the bolt, and a second support pressure plate interposed between the placing surface and the nut corresponding to the pull-out test is attached to the placing surface. A first step of substantially abutting;
The coupling tool is fitted to the pull-out test-compatible nut having a shape that can be freely fitted to the pull-out force loading jack coupling tool, and the second pull-out force loading jack is used to pass the second tool through the coupling tool and the pull-out test corresponding nut. A second step of loading the lock bolt with a pulling force and performing a pulling test;
After the pull-out test is completed, the pull-out test-compatible nut is left screwed to the second lock bolt to release the fitting state of the connector, and the connector and the pull-out force loading jack are removed. The construction method of the natural ground reinforcement structure characterized by providing a 3rd process.   The construction method for a ground reinforcement structure according to claim 3, wherein the pulling force loading jack is a pulling cylinder jack. The pulling force loading jack includes a pressure detection unit that detects a hydraulic pressure input to the pulling force loading jack and a displacement detection unit that detects the displacement of the second lock bolt on which the pulling force is loaded. Along with the data transmission processing unit,
In the second step, the data transmission processing unit wirelessly transmits the data of the pressure acquired from the pressure detection unit or the data of the load corresponding to the pressure to a data recording device, and the acquired from the displacement detection unit The construction method of the natural ground reinforcement structure according to claim 3 or 4, wherein the second rock bolt displacement data is wirelessly transmitted to the data recording device. A pull-out test apparatus used for the construction of the natural ground reinforcement structure according to claim 1 or 2,
A pulling force loading jack for loading a pulling force on the second lock bolt;
A connector of the pulling force loading jack fitted to the nut corresponding to the pulling test;
A pressure detection unit that is installed in the pulling force loading jack and detects a hydraulic pressure input to the pulling force loading jack;
A displacement detector for detecting the displacement of the second lock bolt mounted in the pulling force loading jack and loaded with the pulling force;
A data transmission processing unit attached to the pulling force loading jack;
A data recording device,
The data transmission processing unit wirelessly transmits the pressure data acquired from the pressure detection unit or the load data corresponding to the pressure to the data recording device, and the second lock bolt acquired from the displacement detection unit. A pull-out test apparatus for wirelessly transmitting the displacement data to the data recording apparatus.

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