JP5905414B2 - Removable material pull-out tester - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a reinforcing material pull-out tester for investigating a friction state between a embankment material and a reinforcing material by applying a pressure perpendicular to a contact surface between the embankment material and the reinforcing material, and pulling out the reinforcing material in a horizontal direction. Is.

  Conventionally, as the embankment material used for the reinforced earth wall construction method, a soil material having a large shear resistance angle that can secure a frictional force with the reinforcement material is selected and used. The sorting method was judged by the content of fine particles contained in the embankment material, and the soil material collected at the site was transported to the test room and subjected to a screening test, and the result was judged indirectly.

  In order to directly confirm the friction state between the embankment material and the reinforcing material, as disclosed in Non-Patent Document 1, a test embankment is performed on site, and a full-size reinforcing material is embedded in the embankment, and a heavy machine is used. This is done by compacting the embankment and then pulling out the reinforcement with a jack. Moreover, it may be performed by embedding a reinforcing material in the actual embankment and pulling it out with a jack during the embankment construction.

  In addition, as disclosed in Non-Patent Document 2, a reinforcing material may be embedded in a soil tank into which a banking material has been put in a test room, and the reinforcing material may be pulled out by a pulling tester.

Hirohisa Muto and 5 others, “Pulling test of reinforcing material using both bearing resistance and friction resistance (Part 2)”, 46th Geotechnical Research Conference (Kobe) July 2011, [online ], June 5, 2013 search, Internet <URL http://civil.meijo-u.ac.jp/lab/kodaka/gakkaipdf/46jiban5.pdf> Yoshinori Watanabe, 4 others, “Pulling test of anchor type reinforcing material in the ground”, 44th Geotechnical Research Conference 2009, [online], June 5, 2013 search, Internet <URL http: // civil.meijo-u.ac.jp/lab/kodaka/gakkaipdf/44jiban7.pdf>

  The above-described conventional pull-out test of the reinforcing material disclosed in Non-Patent Document 1 requires a large number of workers and heavy machinery to perform a test embankment in the field and pull out a full-size reinforcing material. It was. For this reason, it took several days to finish the pull-out test. In addition, the above-mentioned conventional pullout test of the reinforcing material carried out by embedding the reinforcing material in the actual embankment cannot be confirmed before the embankment is constructed, and the friction state between the embankment material and the reinforcing material is later confirmed. It was confirmed and performed only for on-site management.

  Further, the conventional reinforcing material pull-out tester disclosed in Non-Patent Document 2 has been used only at the experimental / research level because the tester has no versatility. Moreover, since it is deferred in the test room, it is necessary to collect the embankment material from the site each time and test it in the test room, and the pull-out test cannot be easily performed at the construction site.

The present invention has been made to solve such problems,
A housing for containing the embankment material, a reinforcing material test piece installed in the housing in surface contact with the embedding material, a loading plate placed on the embankment material, and the embankment material by applying a load to the loading plate The vertical load loading means for applying pressure perpendicular to the contact surface between the test piece and the reinforcing material test piece, the pulling means for pulling out the reinforcing material test piece in a direction parallel to the contact surface, and the pressure applied to the contact surface by the vertical load loading means In a reinforcing material pull-out tester comprising a contact surface pressure measuring means for measuring the force and a pulling force measuring means for measuring a force with which the reinforcing material test piece is pulled out by the pulling means,
A first chamber having a housing that is formed to a size that accommodates the embedding material at a depth that is a predetermined multiple of the particle size of the particles constituting the embedding material, and that has an opening in which the loading plate is fitted on the accommodated embankment material. And the first room and the second room partitioned by the first side wall are integrally formed,
In the first chamber, the reinforcing material test piece is accommodated in a position facing the loading plate with the contact surface fitted in the opening portion through the embankment material, and one end passes through the hole formed in the first side wall. The second chamber is connected to one end of the bar in the second chamber, and the other end is formed on the second side wall facing the first side wall and separating the first chamber from the external space. Passed through the hole and extended to the external space,
The other end of the bar extends from the hole formed in the third side wall that divides the second chamber so as to face the first side wall, and a bar stopper is provided at the other end that extends. ,
The contact surface pressure measuring means is provided at the bottom of the first chamber or the vertical load loading means below the reinforcing material test piece,
The pulling force measuring means is sandwiched between the retaining member and the third side wall,
Pulling means, portable pull-test of the stiffener, characterized in that may grant the reinforcement specimen pullout force to pull out the reinforcement specimen from first chamber through the bar by the reaction force from the third side wall The machine was configured.

According to this configuration, the first room is formed in a size that accommodates the embankment material at a depth that is a predetermined multiple of the particle size of the particles that constitute the embankment material, and is therefore installed in the first room . The size of the reinforcing material test piece and the loading plate is also made small accordingly. In addition, by reducing the size of the reinforcing material test piece, the force with which the extraction means pulls out the reinforcing material test piece and the load applied to the loading plate by the vertical load loading means can be reduced, and the vertical load loading means can be made compact. it can. Therefore, the the contact surface pressure measuring means and pulling force measuring means is provided integrally with the housing, the housing is formed to have a structure in which conveying with reinforcement specimen, and loading plate, pull-test machine reinforcement lightweight It becomes compact and can be easily carried.

  For this reason, it is no longer necessary to collect the embankment material from the site each time and test it in the laboratory, and without the need for many workers and heavy machinery, the reinforcement material can be easily pulled out at the construction site before embedding. It becomes possible to perform a test. As a result, it becomes possible to immediately and easily determine whether or not the local embankment material can be used for the reinforcing earth wall, and the construction efficiency of the embankment is improved.

Further, the present invention is characterized in that the vertical load loading means applies a load to the loading plate by a reaction force with respect to the lifting force of the automobile carrying jack mounted on the automobile .

  According to this configuration, the vertical load loading means can be configured by a small carrying jack. Moreover, since the reaction force with respect to the lifting force of the carrying jack can be small, it can be held in the jack receiving portion of the automobile frame. In addition, by using an automobile carrying jack mounted on an automobile, it is not necessary to carry the carrying jack, and the pullout tester for the reinforcing material becomes lighter and more compact and can be carried more easily.

  In addition, the present invention includes a frame surrounding the periphery of the housing, and the carrying jack is installed between the frame and the loading plate, and applies a load to the loading plate by a reaction force from the frame.

  According to this structure, the reaction force with respect to the lifting force of the carrying jack can be applied to the frame surrounding the casing. For this reason, even when a certain amount of heavy objects such as an automobile does not exist, it is possible to apply a load to the loading plate by the lifting force of the carrying jack and perform a pull-out test of the reinforcing material.

  Further, according to the present invention, the vertical load loading means includes a support plate that covers the loading plate and is attached to the housing, and a push screw that applies a load to the loading plate by being screwed into the support plate and screwed. It is characterized by being configured.

  According to this configuration, it is possible to apply a load to the loading plate by the force that the push screw advances, and it is possible to easily configure the vertical load loading means in a small size.

Further, the present invention is characterized in that the reinforcing material test piece is placed on the friction reducing material in the first room , and the embankment material is accommodated in the first room only on the reinforcing material test piece.

According to this configuration, since the reinforcing material test piece is placed on the friction reducing material, the friction generated between the embankment material and the reinforcing material test piece due to the pressure applied to the contact surface is the embedding material of the reinforcing material test piece. It occurs mainly on one side that touches the surface. Therefore, the force with which the extraction means pulls out the reinforcing material test piece and the load applied to the loading plate by the vertical load loading means can be further reduced. Moreover, since the embankment material is accommodated in the first chamber only on the reinforcing material test piece, and the amount of embankment material accommodated is reduced, the housing can be further reduced in size. For this reason, the pull-out tester can be made lighter and more compact, and the pull-out tester can be carried more easily.

  Further, the present invention provides an embankment material and a reinforcing material test piece based on the pressure applied to the contact surface measured by the contact surface pressure measuring means and the force by which the reinforcing material test piece measured by the pulling force measuring means is pulled out. And a display means for displaying the friction coefficient calculated by the calculation means.

  According to this configuration, the friction coefficient between the embankment material and the reinforcing material test piece is calculated by the calculation means, and the calculated friction coefficient is displayed in real time on the display means. Therefore, the measurement measured by each measurement means The trouble of calculating the coefficient of friction each time based on the value is saved, and the construction efficiency of the embankment is further improved.

The present invention also provides:
A displacement displacement measuring means provided integrally with the housing for measuring the displacement that the reinforcing material test piece is pulled out in a direction parallel to the contact surface;
The display means displays the pressure applied to the contact surface, the force with which the reinforcing material test piece is pulled out, and the displacement amount.

  According to this configuration, the displacement amount by which the reinforcing material test piece is pulled out in the horizontal direction is measured by the drawing displacement amount measuring means, and the display means together with the friction coefficient, the pressure applied to the contact surface, and the force with which the reinforcing material test piece is pulled out. Is displayed. For this reason, from each value displayed on the display means, confirm the friction coefficient according to the pressure applied to the contact surface, that is, the applied load, estimate the shear resistance angle of the embankment material from the confirmed friction coefficient, By examining the relationship between the pulling force of the material test piece and the pulling displacement amount, it is possible to easily grasp the friction state between the embankment material and the reinforcing material from various viewpoints.

  According to the present invention, it is not necessary to collect the embankment material from the site each time and test it in the test room, and without requiring many workers and heavy machinery, it can be easily reinforced at the construction site before embedding. A portable pull-out tester for a reinforcing material capable of performing a pull-out test of a material can be provided.

(A) is the top view which showed the portable pull-out test machine of the reinforcement material by the 1st Embodiment of this invention except a loading board, (b) is equipped with the pull-out test machine shown to (a). (C) is a sectional side view of the pull-out tester shown in (a). (A) is a front view of the use aspect which uses the drawing test machine of 1st Embodiment using a motor vehicle, (b) is a side view of the use aspect. It is a sectional side view of the portable pull-out tester of the reinforcing material by the modification of 1st Embodiment. (A) is a top view of the portable pull-out tester of the reinforcing material by the 2nd Embodiment of this invention, (b) is a sectional side view, (c) is a front view.

  Next, the form for implementing the portable pull-out tester of the reinforcing material of the present invention will be described.

  FIG. 1A is a plan view of a portable pull-out tester 1 for a reinforcing material according to a first embodiment of the present invention, and FIG. 1C is a side sectional view thereof.

  The pull-out tester 1 is configured by housing a banking material 3 used for banking in a housing 2 for testing. The housing 2 is formed by processing an iron plate into a box shape to have a length of about 500 mm, a width of about 100 mm, and a height of about 150 mm, and has three rooms 2a, 2b, and 2c. The embankment material 3 is accommodated in the largest room 2a having a length of about 300 mm. In the room 2a, a reinforcing material test piece 4 is placed in horizontal contact with the bottom surface of the housing 2 in surface contact with the embankment material 3. Yes. The reinforcing material test piece 4 is obtained by processing a reinforcing material used for embankment construction as a test piece. In the present embodiment, the reinforcing material test piece 4 is made of a steel strip, and the rib 4a is formed only on one surface in surface contact with the embankment material 3. Yes. In a general pullout test of the reinforcing material, the size of the reinforcing material to be brought into surface contact with the embankment material is 4 m in length and about 60 mm in width, whereas in the pulling test machine 1 of the present embodiment, the length L is 300 mm. The width b is reduced to about 30 mm. The left side wall that divides the room 2a from the central room 2b and the right side wall that separates the room 2a from the external space have a hole that is large enough to allow the reinforcing material test piece 4 to pass through. The room 2b and the other end extend to the external space.

  The room 2a is formed in a size that accommodates a small amount of the embedding material 3 that does not affect the friction generated between the embankment material 3 and the reinforcing material test piece 4, and the embedding material 3 is formed only on the reinforcing material test piece 4. It is accommodated in the room 2a. In the present embodiment, the particle size of the particles constituting the embankment material 3 to be examined is coarse and fine particles of about 10 to 20 mm or less, the particle size is considered to be about 10 mm, and about 5 times that is about By accommodating the embankment material 3 at a depth of 50 mm, the friction generated between the embankment material 3 and the reinforcing material test piece 4 is not affected.

  A loading plate 5 is placed on the embankment material 3. The loading plate 5 has a flat plate shape, and its outer dimension is set to fit into the room 2a. In addition, illustration of the loading board 5 is abbreviate | omitted in the figure (a). A carrying jack 6 is placed on the loading plate 5. The carrying jack 6 constitutes a vertical load loading means that applies a load to the contact surface between the embankment material 3 and the reinforcing material test piece 4 by applying a load to the loading plate 5, and this vertical load loading means is carried by the carrying jack 6. A load is applied to the loading plate 5 by the reaction force P against the lifting force F of the jack 6.

  The reinforcing material test piece 4 is placed on a bearing 7 constituting a friction reducing material in the room 2a. The bearing 7 is provided on the bottom plate 8, and an elastic material 9 made of hard rubber or the like is laid on the bottom of the room 2 a below the bottom plate 8. A pressure gauge 10 is installed at the bottom of a part of the room 2a where the elastic material 9 is not laid. The pressure gauge 10 constitutes the contact surface pressure measuring means for measuring the pressure applied to the contact surface between the embankment material 3 and the reinforcing material test piece 4 by the vertical load loading means, that is, the vertical load P.

  One end of the attachment 11 is connected by a pin 12 to one end of the reinforcing material test piece 4 extending to the room 2b. The attachment 11 includes a connecting plate 11a having a U-shaped cross section and a screw rod 11b. The connecting plate 11 a having a substantially square shape in plan view sandwiches one end of the reinforcing material test piece 4 between the two ends of the attachment 11 that is open. The base portion of the connecting plate 11a is fixed to one end portion of the screw rod 11b by welding or screwing. The wall that divides the central chamber 2b and the left chamber 2c has a hole that is large enough to allow the screw rod 11b to pass through. The other end of the screw rod 11b extends to the left chamber 2c. A male screw is formed on the outer periphery of the extended screw rod 11b.

  A center hole jack 13 and a load cell 14 are passed through the threaded rod 11c extending to the chamber 2c. The center hole jack 13 and the load cell 14 are threaded by a nut 15 screwed into the end of the threaded rod 11b. It is stopped from coming out of 11b. The center hole jack 13 is connected to a hydraulic pump 16 and is supplied with pressure oil from the hydraulic pump 16 to extend its length. When the center hole jack 13 extends, the nut 11 and the attachment 11 screwed into the nut 15 are pulled to the left in the drawing by the reaction force from the wall that partitions the room 2b and the room 2c. When the attachment 11 is pulled to the left in the figure, a pulling force T toward the left in the figure is applied to the reinforcing material test piece 4 connected to the attachment 11. The hydraulic pump 16, the center hole jack 13 and the attachment 11 constitute a pulling means for pulling out the reinforcing material test piece 4 in a direction horizontal to the contact surface between the embankment material 3 and the reinforcing material test piece 4. The center hole jack 13 constituting the pulling means gives a pulling force T to the reinforcing material test piece 4 by a reaction force from a wall that partitions the room 2b and the room 2c, that is, the housing 2.

  Since the other end of the reinforcing material test piece 4 extends into the external space and is formed long as described above, even if the reinforcing material test piece 4 is pulled to the left in the figure, the embankment material 3 and the reinforcing material test piece 4, a constant frictional force continues to be generated, and the pulling force T is maintained at a constant value. The pulling force T for pulling out the reinforcing material test piece 4 is also applied to the load cell 14, and the load cell 14 measures the pulling force T. The load cell 14 constitutes a pulling force measuring unit that measures a force T by which the reinforcing material test piece 4 is pulled out by the pulling unit. A laser rangefinder 17 is fixed on the connecting plate 11a constituting the attachment 11 in the room 2b. This rangefinder 17 irradiates a laser beam on the wall that partitions the room 2b and the room 2c, and measures the distance between the rangefinder 17 and this wall, whereby the reinforcing material test piece 4 is pulled out. The displacement amount δ is measured. The distance meter 17 constitutes a drawing displacement amount measuring means for measuring a displacement amount δ in which the reinforcing material test piece 4 is drawn in a direction horizontal to the contact surface between the embankment material 3 and the reinforcing material test piece 4.

  In the present embodiment, the hydraulic pump 16 constituting the extraction means, the center hole jack 13 and the attachment 11, the pressure gauge 10 constituting the contact surface pressure measurement means, the load cell 14 constituting the extraction force measurement means, and the extraction displacement amount measurement means. As described above, the range finder 17 that constitutes is provided integrally with the housing 2, and is configured to be carried together with the housing 2, the reinforcing material test piece 4, and the loading plate 5.

A display meter 18 is provided in the upper part of the room 2c. The display meter 18 includes a microcomputer and a liquid crystal display panel. The microcomputer includes a width b and a length L, which are dimensions to be brought into surface contact with the embankment material 3 of the reinforcing material test piece 4, a pressure receiving area A where the embedding material 3 receives the vertical load P, and a vertical measured by the pressure gauge 10. The load P, the pulling force T measured by the load cell 14 and the displacement amount δ measured by the rangefinder 17 are input. The microcomputer constitutes a calculation means. Based on the input width b and length L, pressure receiving area A, vertical load P, and pulling force T of the reinforcing material test piece 4, the following (1 ) To calculate the coefficient of friction f between the embankment material 2 and the reinforcing material test piece 4.
f = T / σ · b · L (1)

In the above equation (1), σ is a vertical load per unit pressure-receiving area, and is calculated by the following equation (2).
σ = P / A (2)

  As shown in the plan view of the display meter 18 in FIG. 4B, the liquid crystal display panel provided in the display meter 18 has a friction coefficient f calculated by the microcomputer and a vertical load P input to the microcomputer. The pulling force T and the displacement amount δ are displayed.

  According to such a pull-out test machine 1 of the present embodiment, the housing 2 is sized to accommodate a small amount of the embankment material 3 that does not affect the friction generated between the embankment material 3 and the reinforcing material test piece 4. Therefore, the sizes of the reinforcing material test piece 4 and the loading plate 5 installed in the housing 2 are also made smaller accordingly. Further, by making the reinforcing material test piece 4 small, the pulling force T by which the center hole jack 13 pulls out the reinforcing material test piece 4 and the load applied to the loading plate 5 by the carrying jack 6 can be small, and the vertical load loading means can be used. It can be constituted by a small carrying jack 6. Further, since the reaction force P with respect to the lifting force F of the carrying jack 6 can be small, for example, as shown in FIG. The figure (a) is a front view of the use aspect which uses the pull-out test machine 1 of this embodiment using the motor vehicle 21, The figure (b) is a side view of the use aspect. 2 that are the same as or correspond to those in FIG. 1 are assigned the same reference numerals, and descriptions thereof are omitted.

In the usage mode of the pull-out tester 1 shown in the figure, the weight of the automobile 21 is 1.5 [ton] (= 15 [KN]), and the carrying jack 6 has a load corresponding to half the weight 7.5 [KN]. Is applied as the reaction force P, the pulling force T required for the center hole jack 13 is calculated as follows. First, the vertical load σ per unit pressure receiving area is calculated from the equation (2) as follows.
σ = P / A = 7.5 [KN] / (0.3 [m] × 0.1 [m]) = 250 [KN / m ² ]

Further, when the minimum required value for the design of the friction coefficient between the embankment material 3 and the reinforcing material test piece 4 is 0.726, the minimum pulling force T required for the center hole jack 13 is: It is calculated as follows from the equation (1) and becomes about 1.63 [KN].
T = σ · b · L · f = 250 [KN / m ² ] × 0.03 [m] × 0.3 [m] × 0.726
= 1.63 [KN]

  For a reinforcing material having a length of 4 m and a width of about 60 mm used for a general reinforcing material pull-out test, the pulling force T is 2 to 5 [ton] (= 20 to 50 [KN]. ) However, the pulling force T of about 1.63 [KN], which is the minimum required in the pulling test machine 1 of the present embodiment, is about 1/10 of the conventional value.

  Therefore, as in the present embodiment, the hydraulic pump 16, the center hole jack 13 and the attachment 11, the pressure gauge 10, the load cell 14, and the distance meter 17 are integrally provided in the casing 2, and the casing 2, the reinforcing material test piece 4 and the loading plate 5 are configured to carry the reinforcing material pull-out tester 1 so as to be light and compact with a total weight of about 10 to 15 [Kg] and can be easily carried. The portable jack 6 may be a commercially available general mechanical screw jack, a liquid-operated hydraulic jack, a pneumatic air jack, or the like. However, a portable jack for an automobile loaded on the automobile 21 is used. This eliminates the need to carry it. For this reason, the pull-out tester 1 for reinforcing material is lighter and more compact and can be carried more easily.

  For this reason, according to the pull-out test machine 1 of this embodiment, it is not necessary to collect the embankment material 3 from the site each time and test it in the test room, and it is possible to construct without requiring many workers and heavy machinery. It becomes possible to easily perform a pull-out test of the reinforcing material at the site. As a result, it becomes possible to immediately determine whether or not the local embankment material can be used for the reinforcing earth wall before the embankment is carried out, and the construction efficiency of the embankment is improved.

  Further, according to the pull-out test machine 1 of the present embodiment, since the reinforcing material test piece 4 is placed on the bearing 7, the friction generated between the embankment material 3 and the reinforcing material test piece 4 by the vertical load P. Occurs only on one side of the reinforcing material test piece 4 in contact with the embankment material 3. Accordingly, the pulling force T by which the center hole jack 13 pulls out the reinforcing material test piece 4 and the load applied to the loading plate 5 by the carrying jack 6 bring the embankment material 3 into contact with both surfaces of the reinforcing material test piece 4 and the reinforcing material test piece. Compared with the case where friction is generated on both sides of the sheet 4, the size can be reduced. Moreover, since the embankment material 3 is accommodated in the room 2a only on the reinforcing material test piece 4, compared with the case where the embankment material 3 is accommodated above and below the reinforcing material test piece 4, the capacity of the embankment material 3 is accommodated. And the housing 2 can be made smaller. For this reason, compared with the case where the embankment material 3 is accommodated above and below the reinforcing material test piece 4, the pull-out tester 1 can be made lighter and more compact, and the pull-out tester 1 can be carried more easily.

  Further, according to the pull-out test machine 1 of the present embodiment, the friction coefficient f between the embankment material 3 and the reinforcing material test piece 4 is calculated by the microcomputer, and the calculated friction coefficient f is displayed on the display meter 18 in real time. Since it is displayed, the trouble of calculating the friction coefficient f each time based on the measurement values measured by the pressure gauge 10 and the load cell 14 is saved, and the construction efficiency of the banking is further improved.

  Further, according to the pull-out test machine 1 of the present embodiment, the displacement δ by which the reinforcing material test piece 4 is pulled out in the horizontal direction is measured by the distance meter 17, and the friction coefficient f, the vertical load P, and the pull-out force T are measured. At the same time, it is displayed on the display meter 18. Therefore, the friction coefficient f corresponding to the vertical load P is confirmed from each value displayed on the display meter 18, the shear resistance angle of the embankment material 3 is estimated from the confirmed friction coefficient f, and the reinforcement By examining the relationship between the drawing force T of the material test piece 4 and the displacement amount δ, the friction state between the embankment material 3 and the reinforcing material test piece 4 can be easily grasped from various viewpoints.

  In the above embodiment, the case where the reaction force of the carrying jack 6 is given using a heavy object such as the automobile 21 has been described. However, it is not always necessary to give the reaction force of the carrying jack 6 using a heavy object. For example, you may comprise so that the reaction force of the carrying jack 6 may be given using the frame 31 shown in FIG. In the figure, the same or corresponding parts as in FIG.

  A portable pull-out tester 1 </ b> A according to a modification of the first embodiment shown in FIG. 3 includes a frame 31 that surrounds the periphery of the housing 2. The frame 31 is composed of an upper frame 31a and a lower frame 31b. The upper frame 31a and the lower frame 31b are fastened by bolts 32 and nuts 33 with a carrying jack 6 interposed between the upper frame 31a and the loading plate 5. Has been. The carrying jack 6 installed between the upper frame 31 a and the loading plate 5 applies a load to the loading plate 5 by the reaction force P from the frame 31.

  According to the pull-out testing machine 1A of this modification, the reaction force P against the lifting force F of the carrying jack 6 can be applied to the frame 31 surrounding the casing 2. For this reason, even when a certain amount of heavy objects such as the automobile 21 does not exist, the loading plate 5 can be loaded by the lifting force F of the carrying jack 6 and the pullout test of the reinforcing material test piece 4 can be performed. The same effects as the pull-out tester 1 according to the embodiment are exhibited.

  4A is a plan view of a portable pull-out tester 41 for a reinforcing material according to a second embodiment of the present invention, FIG. 4B is a side sectional view thereof, and FIG. 4C is a front view thereof. It is. In the figure, the same or corresponding parts as in FIG.

  The pull-out tester 41 according to the second embodiment differs from the pull-out tester 1 according to the first embodiment described above only in the configuration described below, and the other configurations are the pull-out tester according to the first embodiment. Same as 1.

  In the first embodiment, the casing 2 includes the three rooms 2a, 2b, and 2c. In the second embodiment, the casing 2A includes only the two rooms 2a and 2b, and the length thereof. Is formed to be approximately 400 mm. In addition, the housing 2A is configured by attaching flanges 2d along the upper and lower sides of the housing 2A. Moreover, in 2nd Embodiment, the center hole jack 13 is not provided but the load cell 14 and the nut 15 are exposed and provided outside. The nut 15 is manually tightened by a ratchet wrench (not shown), thereby receiving a reaction force from the left side wall partitioning the room 2b from the external space and applying a pulling force T to the reinforcing material test piece 4. The nut 15 and the ratchet wrench constitute a pulling means that applies a pulling force T to the reinforcing material test piece 4 by a reaction force from the housing 2A.

  Moreover, in 2nd Embodiment, the carrying board 6 is not used but the support plate 42 and the press screw 43 are provided, and the vertical load loading means is comprised. The support plate 42 is made of a U-shaped plate material that covers the loading plate 5, and both ends are attached to the flange 2 d of the housing 2 </ b> A by bolts 44. The push screw 43 is screwed to the top plate of the support plate 42, a pressure plate 46 is provided at the lower end thereof via a load cell 45, and a handle 47 is attached to the upper end thereof. The pressure plate 46 includes a columnar body having an outer diameter substantially the same as that of the load cell 45, and reinforcing plates provided upright on both sides of the columnar body. When the handle 47 is rotated and the push screw 43 screwed into the support plate 42 is turned, a load is applied to the loading plate 5 via the load cell 45 and the pressure plate 46.

  The load cell 45 constitutes, together with the pressure gauge 10, a contact surface pressure measuring unit that measures the vertical load P. In the second embodiment, the contact pressure applied to the contact surface between the embankment material 3 and the reinforcing material test piece 4 is measured by the load cell 45 on the side where the applied load P is applied to the contact surface, and the side on which the applied load P is applied. Is measured by the pressure gauge 10. And from these both measured values, the contact pressure concerning the contact surface of the embankment material 3 and the reinforcing material test piece 4 is grasped | ascertained appropriately.

  In the second embodiment, the friction reducing material is not the bearing 7 but is constituted by sand 48 laid thinly under the reinforcing material test piece 4. The rib 4 b is also provided on the back surface of the reinforcing material test piece 4. Is formed. When the friction reducing material is composed of sand 48, the elastic material 9 is not provided in the room 2a, and the bottom plate 8 is provided in place of the elastic material 9 in the place where the elastic material 9 is provided in the first embodiment. It is done. Friction mainly occurs between one surface of the reinforcing material test piece 4 where the rib 4a is formed and the embankment material 3, but also between the sand 48 and the back surface of the reinforcing material test piece 4 where the rib 4b is formed. Somewhat happens. However, in the calculation of the pulling force T by the pulling means, the pulling force T is properly calculated by taking the frictional force with the sand 48 into consideration. In addition, it is easier to install the friction reducing material with the sand 48 than the bearing 7, and the weight of the pull-out tester 41 can be reduced. Here, even when the rib 4a is formed only on the front surface similarly to the first embodiment without forming the rib 4b on the back surface of the reinforcing material test piece 4, the gap between the sand 48 and the reinforcing material test piece 4 is not limited. However, in the calculation of the pulling force T, the pulling force T can be appropriately calculated by considering the frictional force with the sand 48 in the same manner.

  According to the pull-out test machine 41 according to the second embodiment, a load can be applied to the loading plate 5 by the force of the push screw 43, and a vertical load loading means can be configured easily in a small size. Thus, the same operational effects as the pull-out tester 1 according to the first embodiment are exhibited.

  In the pull-out tester 1 according to the first embodiment and the pull-out tester 1A according to the modification, the bearing 7 is provided below the reinforcing material test piece 4, and the pull-out tester 41 according to the second embodiment is reinforced. Sand 48 is provided below the material test piece 4, and the embankment material 3 is put into the room 2 a only on the upper part of the reinforcement material test piece 4, mainly between the embankment material 3 and one side of the reinforcement material test piece 4. Only the case of generating friction has been described. However, a friction reducing material such as a bearing 7 and sand 48 is not provided below the reinforcing material test piece 4, and the embankment material 3 is also introduced into the room 2 a below the reinforcing material test piece 4. You may comprise so that friction may be produced between both surfaces of the test piece 4. FIG. In this case, the pulling force T for pulling out the reinforcing material test piece 4 is somewhat increased, but the same effects as the pulling test machines 1 and 41 according to the above-described embodiments are exhibited.

  In the pull-out test machines 1, 1A, 41 according to the above-described embodiments and modifications, the case where the reinforcing material test piece 4 is a steel strip used in the tail armature method has been described. However, not only for steel strips, but also for resin strips, rebars used as reinforcements for many anchor-type reinforced earth walls, and geotextiles of polymer materials used as reinforcements for geotextile reinforced earth walls, The pull-out test can be performed in the same manner as the above-described embodiment using a test piece.

  DESCRIPTION OF SYMBOLS 1,1A, 41 ... Portable pull-out tester, 2 ... Housing, 2a, 2b, 2c ... Room, 2d ... Flange, 3 ... Filling material, 4 ... Reinforcement specimen, 4a, 4b ... Rib, 5 ... Loading Plate: 6 Carrying jack, 7 Bearing, 8 Bottom plate, 9 Elastic material, 10 Pressure gauge, 11 Attachment, 11a, 11b Plate, 11c Screw rod, 12 Pin, 13 Center hole jack, DESCRIPTION OF SYMBOLS 14 ... Load cell, 15 ... Nut, 16 ... Hydraulic pump, 17 ... Distance meter, 18 ... Display meter, 31 ... Frame, 42 ... Support plate, 43 ... Push screw, 45 ... Load cell, 46 ... Pressure board, 47 ... Handle 48 ... sand

Claims (7)

A housing for accommodating the embankment material, a reinforcing material test piece installed in the housing in surface contact with the embedding material, a loading plate placed on the embankment material, and applying a load to the loading plate Vertical load loading means for applying pressure perpendicularly to the contact surface between the embankment material and the reinforcing material test piece, pulling means for pulling out the reinforcing material test piece in a direction parallel to the contact surface, and the vertical load loading means In a reinforcing material pull-out tester comprising: a contact surface pressure measuring means for measuring the pressure applied to the contact surface by: and a pulling force measuring means for measuring a force by which the reinforcing material test piece is pulled out by the pulling means.
The housing is formed to a size that accommodates the embedding material at a depth that is a predetermined multiple of the particle size of the particles constituting the embedding material, and has an opening in which the packing plate is fitted on the accommodated embankment material. A first chamber having a first chamber and a second chamber partitioned by a first side wall;
The reinforcing material test piece is accommodated in the first chamber at a position where the contact surface is opposed to the packing plate described above in which the contact surface is fitted in the opening via the embankment material, and one end is on the first side wall. It passes through the formed hole and extends to the second chamber, and is connected to one end portion of the bar in the second chamber, and the other end faces the first side wall and passes through the first chamber. Passed through a hole formed in the second side wall separated from the external space and extended to the external space,
The other end of the bar extends from a hole formed in the third side wall that partitions the second chamber so as to face the first side wall, and the bar is prevented from coming off at the other end that extends. Members are provided,
The contact surface pressure measuring means is provided at the bottom of the first chamber or the vertical load loading means below the reinforcing material test piece,
The pull-out force measuring means is sandwiched between the retaining member and the third side wall,
The drawing means, reinforcement, characterized in that the pull-out force to pull out the reinforcement test piece from the first chamber through the rod by a reaction force from the third side wall may grant to the reinforcing material test piece Portable pull-out tester for materials. 2. The portable pull-out tester for a reinforcing material according to claim 1, wherein the vertical load loading means applies a load to the loading plate by a reaction force with respect to a lifting force of an automobile carrying jack mounted on an automobile .   A frame surrounding the periphery of the housing is provided, and the carrying jack is installed between the frame and the packing plate described above, and applies a load to the packing plate according to a reaction force from the frame. 2. A portable pull-out tester for reinforcing material according to 2.   The vertical load loading means includes a support plate that covers the load plate and is attached to the housing, and a push screw that applies a load to the load plate by being screwed and screwed to the support plate. The portable pull-out tester for a reinforcing material according to claim 1, which is configured. The reinforcing material test piece is placed on a friction reducing material in the first chamber , and the embankment material is accommodated in the first chamber only on the reinforcing material test piece. The portable pull-out tester for a reinforcing material according to any one of claims 1 to 4.   Based on the pressure applied to the contact surface measured by the contact surface pressure measuring means and the force by which the reinforcing material test piece is extracted measured by the pulling force measuring means, the embankment material and the reinforcing material test piece, 6. The reinforcement according to claim 1, further comprising: a calculation unit that calculates a friction coefficient between the two and a display unit that displays the friction coefficient calculated by the calculation unit. Portable pull-out tester for materials. A displacement displacement measuring means provided integrally with the housing for measuring the displacement of the reinforcing material test piece being pulled in a direction horizontal to the contact surface;
The said display means displays the pressure concerning the said contact surface, the force by which the said reinforcing material test piece is pulled out, and the said displacement amount, The portable pull-out tester of the reinforcing material of Claim 6 characterized by the above-mentioned.

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