JP6247183B2 - Fixing structure of screw member, fixing method of screw member, and fixing strength management method of screw member - Google Patents

Description

  The present invention relates to a screw member fixing structure in which a screw member is inserted into a hole formed in a housing such as a concrete structure, and the screw member is fixed using a binder such as an adhesive, and the screw member is fixed. The present invention also relates to a method and a fixing strength management method for the screw member.

  Various screw members such as bolts and screw screws are used to fix objects to be fixed such as interior materials, reinforcements and other equipment to foundations, columns, beams, ceilings, etc. of civil engineering structures and buildings. It is done.

The screw member is sometimes buried secured to skeleton in concentrated rie preparative is cured, to already skeleton of concrete or existing concrete is cured, or fixed target matrix, such as rock or stone Those that will be constructed later are especially called post-construction anchors.

In the post-construction anchor, first, an anchor hole is drilled using a drilling tool such as a concrete or the like, which is a base material to be fixed, and a screw member is inserted into the hole.
There is a type called a chemical anchor in which a bonding material such as an adhesive is interposed between the screw member and the inner surface of the anchor hole, and the screw member is fixed to the fixing target base material through the bonding material. There is also a type called a diameter-expanded (driving-type) anchor in which a part of the screw member is expanded in diameter in the anchor hole and exhibits a retaining function with respect to the inner surface of the anchor hole.

  In a chemical anchor, the screw member is fixed by, for example, inserting a capsule containing a binder composed of a resin, a curing agent, an additive or the like into the anchor hole and inserting the screw member into the anchor hole. Some capsules are broken and the components of the binder are mixed and activated and hardened. When the binder is cured, the screw member is fixedly fixed in the anchor hole. Alternatively, there is a method of injecting the binder before or after inserting the screw member into the anchor hole (see, for example, Patent Documents 1 and 2).

JP-A-8-226427 JP 2001-89716 A (paragraphs 0045 to 0047 on page 6)

  In the fixing structure and fixing method of a screw member by a conventional chemical anchor, a binder is present around the entire periphery of the screw member. That is, the screw member and the inner surface of the anchor hole are not in direct contact with each other, and the fixing strength of the screw member is almost based only on the adhesive bond between the binder and the outer surface of the screw member and between the binder and the inner surface of the anchor hole. Yes.

  For this reason, the fixing strength of the screw member is generally confirmed by the pulling strength of the screw member from the base material to be fixed. The measurement of the pull-out strength of the screw member is usually performed using a hydraulic load-loading device (center hole jack or the like). Does the screw member have a fixing strength that can withstand a predetermined load in the pull-out direction? It is judged by how.

  However, the set of load loading devices for performing this pull-out test is very complicated and time consuming and laborious, and the load loading devices are very heavy and are heavy labor. In particular, when the work is performed in an upward posture as in the case of construction on a tunnel inner wall or ceiling, it is more difficult and time-consuming to handle the load device. For this reason, performing a pull-out test on a large number of screw members has a great influence on the work process and work cost. This also applies to the case of a diameter-enlarged anchor in which a part of the screw member expands in the anchor hole.

  In general, there is a demand for higher fixing strength and durability as a fixing structure of the screw member.

  Accordingly, an object of the present invention is to further increase the fixing strength and durability of the screw member to the base material to be fixed and to facilitate the management of the fixing strength.

  In order to solve the above-described problems, the present invention provides an anchor hole formed in a base material to be fixed such as concrete, a screw member having a main body male screw portion inserted into the anchor hole, and the screw member and the anchor. A binder interposed between the inner surface of the hole, and the thread portion enters the spiral thread groove formed on the inner surface of the anchor hole by the spiral thread portion of the main body male thread portion, In addition, a screw member fixing structure in which the binder is interposed between the outer surface of the screw member and the inner surface of the anchor hole and the screw member is fixed to the base material to be fixed is employed.

  In this configuration, it is possible to adopt a configuration in which a groove portion is formed in the main body male screw portion along the axial direction, and the binder is contained in the groove portion.

  The groove portion includes a first groove portion extending from the front end of the main body male screw portion toward the rear end, and a length extending from the front end of the main body male screw portion toward the rear end, which is longer than the length of the first groove portion. A configuration including a short second groove portion can be employed.

  Furthermore, it is desirable that the bottom surface of the valley portion between the thread portions adjacent to each other in the axial direction of the main body male screw portion is formed in a cross-sectional arc shape along the axial direction.

The following methods can be employed as a construction method for constructing these screw member fixing methods.
That is, when an anchor hole is drilled in a base material to be fixed such as concrete, and a screw member having a main body male screw portion is inserted into the anchor hole, the helical thread portion of the main body male screw portion A spiral thread groove is formed on the inner surface of the anchor hole so that the thread portion enters the thread groove, and a binder is interposed in the space between the outer surface of the screw member and the inner surface of the anchor hole. A screw member fixing method for fixing the screw member to the base material to be fixed.

Further, as a fixing strength management method for the screw member used in the fixing structure for these screw members, the following method can be adopted.
That is, the screw member includes a torque management operation portion at a rear end thereof, and by applying a rotational force around the axis to the torque management operation portion, the screw member is applied to the fixing target base material by the rotational torque. This is a screw member fixing strength management method for evaluating the fixing strength.

  According to the present invention, the fixing strength and durability of the screw member to the base material to be fixed can be further increased, and the fixing strength can be easily managed.

Shows an embodiment of the present invention, (a) shows the plan view, (b) a front view, (c) a bottom view, I of (d) are (b) - I cross section The principal part expansion perspective view which shows the front-end | tip of the screw member of the embodiment The fixing structure of a screw member is shown, (a) is front sectional drawing, (b) is the principal part enlarged view of (a). The detail of a screw member is shown, (a) is a principal part expanded sectional view, (b) is the further enlarged view of (a), (c) is a principal part expanded sectional view which shows the modification of (a). The principal part expansion perspective view which shows the front-end | tip of the screw member of other embodiment. Still another embodiment is shown, (a) is a plan view, (b) is a front view, and (c) is a bottom view. The principal part expansion perspective view which shows the front-end | tip of the screw member of embodiment of FIG. (A) (b) is a sectional view of the anchor fixing structure employed in the experimental example The test body of the base material to be fixed used in the experimental example is shown, (a) is a left side view, (b) is a plan view, and (c) is a front view. Chart showing test specimen and construction details Chart showing test results Chart showing test results Chart showing test results

  Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, an anchor hole B is drilled in a concrete body or the like (hereinafter referred to as “fixed target base material C”) as a base material to be fixed using a drill or the like, and the anchor hole B is formed in the anchor hole B. “Post-installed anchor” for inserting and fixing the shaft-like screw member 10, in particular, a chemical anchor fixing structure in which a bonding material A such as an adhesive is interposed between the screw member 10 and the inner surface of the anchor hole B, and fixing The present invention relates to a method and a fixing strength management method.

  A screw member 10 used in this embodiment is shown in FIGS.

  The screw member 10 of this embodiment includes a main body male screw portion 13, a rear end male screw portion 12, and a pin tail portion 11 in order from the front end side entering the anchor hole B of the base material C to be fixed toward the rear end side. Screw screw.

  The main body male screw portion 13 includes a screw thread portion 13a having a relatively high screw thread height (hereinafter referred to as “first screw thread portion 13a”) and a screw thread portion having a relatively low screw thread height. This is a double-threaded screw provided alternately with second threaded portions 13c (hereinafter referred to as “second threaded portions 13c”). In other words, there are two sets of spiral portions constituting the screw thread, and the screw member 10 is advanced along the axial direction by a distance of two screw threads while being rotated around the axis.

  As shown in FIGS. 4A and 4B, the bottom surface of the valley portion 13b between the first thread portion 13a and the second thread portion 13c is formed in a cross-sectional arc shape along the axial direction. ing. That is, the bottom surface of the valley portion 13b between the screw thread portions 13a and 13c adjacent to each other in the axial direction of the main body male screw portion 13 is formed in a circular arc shape along the axial direction over the entire region. The symbol R shown in FIG. 4B is the radius of the arc. Moreover, the code | symbol x in a figure is the pitch of the 1st thread part 13a, and this is the same as the 2nd thread part 13b. In the figure, the symbol y indicates the height of the first thread portion 13a, and the symbol z indicates the height of the second thread portion 13b. The symbol α indicates the angle formed by the flank near the top of the first threaded portion 13a, and β indicates the angle formed by the flank near the middle of the first threaded portion 13a. A symbol γ indicates an angle formed by flanks near the top of the second thread portion 13c.

  The distal end side of the main body male screw portion 13 is the distal end portion 14 of the screw member 10. The tip end portion 14 has a tapered truncated cone shape. The side surface 14a of the distal end portion 14 is a conical surface that becomes gradually thinner toward the distal end, and the end surface 14b of the distal end portion 14 is a flat surface having a surface direction orthogonal to the axial direction. The shape of the distal end portion 14 can be changed, and may be, for example, a cylindrical shape, a conical shape, a rectangular tube shape, a truncated pyramid shape, or a pyramidal shape.

  The rear end male screw portion 12 includes a screw thread portion 12a made of a male screw. By screwing a nut (not shown) into the threaded portion 12a, various objects to be fixed (see FIG. 5) between the nut and the surface of the base material C to be fixed or directly on the rear end male threaded portion 12. (Not shown) can be fixed. The rear end male screw portion 12 only needs to have a structure capable of receiving a predetermined load. The rear end male screw portion 12 is not limited to the male screw, and may have another structure such as a female screw, a hexagonal cross section, or a circular cross section head. .

  The pin tail part 11 is comprised by the spline provided with the peak part 11a and the trough part 11b which are extended in an axial direction at a fixed space | interval along the circumference direction around an axis.

  A groove portion 20 is formed in the main body male screw portion 13 along the axial direction. The binder B enters the groove 20. In this embodiment, a total of four groove portions 20 of the same length are provided in equal orientations every 90 ° around the axis, but the arrangement and number of the groove portions 20 can be freely set.

  In this embodiment, the groove 20 is formed at a predetermined depth from the top of the first screw thread 13a toward the inner diameter side, and the depth is higher than the height of the thread of the first screw thread 13a. Is set to be shallow, and the depth does not reach the top of the second screw thread portion 13b. Therefore, the groove part 20 is formed only at the top part of the first thread part 13a, and the groove part 20 is not formed in the second thread part 13b or the valley part 13b. However, since the depth of this groove part 20 can be freely set according to the performance required for the anchor, for example, the groove part 20 reaching the second screw thread part 13b or the valley part 13b may be used. This groove part 20 can be formed by press work, for example.

  The screw member 10 is entirely made of carbon steel. In particular, the main body male screw portion 13 is quenched. The material of the screw member 10 is not limited to carbon steel, and a metal made of stainless steel or other materials can also be adopted.

  However, the screw thread portion of the main body male screw portion 13 is required to have a self-tapping function that bites into the inner surface of the anchor hole B of the base material C to be fixed. For this reason, at least the material of the screw thread portion that requires the self-tapping function (in this embodiment, the first screw thread portion 13a which is a screw thread portion having a relatively high screw thread height) corresponds to It is desirable to use a material that is relatively harder than the base material C to be fixed.

  FIG. 3 shows a structure in which the screw member 10 is fixed in the anchor hole B of the base material C to be fixed.

  As shown in FIG. 3, the fixing structure of the screw member 10 of this embodiment includes an anchor hole B formed in the base material C to be fixed, the screw member 10 described above, and the screw member 10 and the inner surface of the anchor hole B. And a binder A interposed between the two.

  The main body male screw portion 13 of the screw member 10 is screwed into the anchor hole B drilled in the base material C to be fixed, and the self-tapping function of the helical thread portion of the main body male screw portion 13 allows the anchor hole B to be A spiral thread groove D is formed on the inner surface.

  As shown in FIG. 3, the spiral screw groove D is formed in a state in which a gap is interposed between the inner surface of the screw groove D and the outer surface of the screw thread portion of the main body male screw portion 13. During the self-tapping process, the thread groove D is formed so that the cross section of the thread groove D is slightly larger than the cross section of the screw thread part as the main body male screw part 13 rotates around the axis. In the figure, the cross section of the thread groove D is an isosceles trapezoidal shape, and the cross section of the thread portion 13a is a triangular shape. The top portion of the first screw thread portion 13a and the bottom surface of the trapezoidal screw groove D opposed thereto are in contact with each other with a slight gap. In addition, the flank of the first screw thread portion 13a and the slope of the trapezoidal screw groove D facing it are also facing each other with a gap.

  The screw thread portion of the main body male screw portion 13 enters the screw groove D, and the binder A is interposed in the space between the inner surface of the screw groove D and the outer surface of the screw thread portion 13a of the main body male screw portion 13. Yes. In addition, the binder A is interposed between the outer surface of the screw member 10 and the inner surface of the anchor hole B at locations other than the screw groove D and the screw thread portion 13a.

  In this embodiment, with respect to the thread height y of the first thread portion 13a and the inner diameter d of the anchor hole B, the penetration depth of the thread into the thread groove D is h. The ratio of the height y or the inner diameter d to the depth h is appropriately determined depending on the type of the fixing target base material required, the required fixing strength, and the like.

  The rear end male screw portion 12 is in a state of protruding from the surface of the base material C to be fixed. Since the thread portion 12a of the rear end male screw portion 12 protrudes, the fixed object can be fixed using this portion as described above.

  In FIG. 3, the pin tail portion 11 is a member integrated with the rear end male screw portion 12 and is described in a state in which both portions are connected. As described later, after the construction, the pin tail portion 11 and the rear end male screw portion are described. The screw part 12 is cut off.

  A construction method for constructing these screw member fixing methods will be described below.

  First, the anchor hole B is drilled in the base material C to be fixed. For drilling, a drilling tool such as an electric drill is used. The inner diameter of the anchor hole B is such that the thread portion of the main body male screw portion 13 forms a screw groove D on the inner surface of the anchor hole B, and the thread portion of the main body male screw portion 13 can enter the screw groove D. The diameter is smaller than the maximum outer diameter of the thread portion of the main body male screw portion 13 by an amount corresponding to the aforementioned depth h.

  Next, the screw member 10 is screwed into the anchor hole B. For example, a screw is inserted into the rear male screw portion 12 at the rear end of the screw member 10 and a connecting means such as a holder or a socket is fitted into the nut. It can be tightened by rotating around. Alternatively, it is also possible to tighten using an electric impact wrench or the like using a connecting means such as a holder or a socket that can be fitted into the pin tail portion 11.

  By screwing the main body male screw portion 13 of the screw member 10 into the anchor hole B, the helical thread portion 13a of the main body male screw portion 13 is bitten into the inner surface of the anchor hole B, and the self tapping function causes the anchor hole B to The inner surface is shaved, and a spiral thread groove D is formed on the inner surface. At this time, the screw thread portion 13a enters the screw groove D. At the same time, the binder A is spread over the space between the outer surface of the screw member 10 and the inner surface of the anchor hole B.

  The thread portion 13a of the main body male screw portion 13 is inserted into the screw groove D on the inner surface of the anchor hole B, and the binder A is interposed in the space between the outer surface of the screw member 10 and the inner surface of the anchor hole B. Therefore, the adhesive force between the screw member 10 and the fixing target base material C due to the binder A and the frictional force between the screw member 10 and the fixing target base material C due to the biting into the inner surface of the anchor hole B of the screw thread portion 13a are combined. Accordingly, the fixing strength and durability of the screw member 10 to the fixing base material C can be further increased.

  Further, since the bottom surface of the valley portion 13b between the screw thread portions 13a and 13c adjacent to each other in the axial direction of the main body male screw portion 13 is formed in a circular arc shape along the axial direction over the entire region, the screw member There are few break points on the inner surface of the space between the outer surface of 10 and the inner surface of the anchor hole B, and the effect that the binder A easily spreads over the whole can also be expected.

  In the case of a specification that can exhibit a predetermined fixing strength without expecting the effect of making the bottom surface of the valley portion 13b into a circular arc shape, for example, as shown in FIG. A portion closer to the center in the axial direction may be a flat surface. A line indicated by a chain line in FIG. 4A corresponds to the bottom surface of the valley portion 13b in FIG.

  Moreover, since the groove part 20 along the axial direction is formed in the main body male screw part 13, the binder A is spread more smoothly. Here, the point that the main body male screw portion 13 is a double thread having two screw thread portions having different thread heights is also effective for smooth filling of the binder A.

  As the binder A, any material that can exhibit predetermined strength and durability after solidification can be freely employed. For example, a two-component mixed organic adhesive using an uncured resin and a curing agent capable of curing the resin, or an action to accelerate curing of an uncured cement material and the cement material It is possible to use a two-component mixed type inorganic sticking agent using a curing accelerator having Alternatively, a known adhesive corresponding to a stone material such as concrete or a metal material can be used.

  In the embodiment, as the binder A, a two-component mixed type organic sticking agent is used. After the anchor hole B is drilled in the base material C to be fixed, before the screw member 10 is screwed into the anchor hole B, a fixing agent mixed with two liquids is injected into the anchor hole B. Alternatively, after the screw member 10 is screwed into the anchor hole B to some extent, the fixing agent may be injected.

Further, as the binder A, those encapsulated in a glass or resin capsule can be used. Capsule Leave inserts (not shown) in advance in the anchor hole B, by a screw member 10 screwed in this state, destroying mosquitoes capsule at the tip 14, the inside of the binder A, the screw member It fills between the outer surface of 10 and the inner surface of the anchor hole B. When the binder A is cured, the screw member 10 is fixed in the anchor hole B and is in the state shown in FIG.

  Here, if the shape of the tip portion 14 is tapered as described above, the resistance when the screw member 10 is screwed into the anchor hole B is reduced, and in particular, what is encapsulated in the capsule as the binder A is used. When used, the capsule is smoothly broken.

  Moreover, a slightly small-diameter neck portion 11c is formed between the pin tail portion 11 and the rear end male screw portion 12. After the screw member 10 is fixed in the anchor hole B, when a predetermined rotational torque is applied to the pin tail portion 11, the pin tail portion 11 is cut from the member on the tip end side through the neck portion 11c. ing.

  For this reason, after the fixing agent is completely cured and the screw member 10 is fixed in the anchor hole B, using a tool such as an electric torque wrench, rotational torque in the direction opposite to that when the screw member 10 is screwed is applied. Add. At this time, if the pintail portion 11 is cut, it can be confirmed that a predetermined torque is exerted by applying a predetermined torque. That is, here, a so-called Torcia bolt is used, and when a dedicated fastening machine is fitted to the pin tail portion 11 at the rear end of the screw member 10 and rotated around the axis, the pin tail is applied when a predetermined torque is applied. The part 11 can be broken to inform it. For this reason, after construction, the result of the inspection can be confirmed whether or not the screw member 10 has a predetermined fixing strength with respect to the base material C to be fixed by the appearance of whether or not the pintail portion 11 remains. This inspection may be performed using an electric tool as described above, or may be performed manually using a tool such as a manual torque wrench.

  In the conventional chemical anchor, the screw member 10 and the inner surface of the anchor hole B are not in direct contact with each other, and the fixing strength of the screw member 10 to the fixing target base material C is approximately the binder A and the outer surface of the screw member 10. It was based solely on the adhesive bond between the binder A and the inner surface of the anchor hole B. For this reason, in order to confirm the fixing strength of the screw member 10 with respect to the base material C to be fixed, there was no method other than performing a pull-out test.

  However, according to the present invention, the fixing strength can be easily confirmed by the torque management of the screw member 10 without performing a complicated pull-out test. If the fixing strength is confirmed by torque management, a complete survey can be easily performed in a short time. In this embodiment, since the torque management is possible by cutting the pin tail portion 11, the torque management is completed simultaneously with the placement of the screw member 10, and a separate fixing inspection can be made unnecessary.

  The effect of simplifying the fixing strength management is that a part of the screw member 10 is expanded in the diameter of the anchor hole B, and a diameter expanding type (driving type) that exerts a retaining function on the inner surface of the anchor hole B. ) Anchor is not what you can expect. Further, a conventional chemical anchor in which the thread portion of the screw member 10 does not bite into the base material C to be fixed is not expected.

  By the way, in said embodiment, although the thing provided with the pin tail part 11 was employ | adopted as a screw member used for the fixation structure of these screw members, you may employ | adopt the screw member 10 which does not comprise the pin tail part 11. FIG.

  At this time, as a fixing strength management method of the screw member 10, for example, the following method can be employed.

  That is, the screw member 10 is provided with a torque management operation unit at the rear end thereof. For example, the torque management operation unit may be configured by a spline similar to the above-described pin tail unit 11, or may be configured by a male screw unit or a female screw unit which is a reverse screw with respect to the main body male screw unit 13. Good.

  After the screw member 10 is placed and the binder A is cured, the torque management operation portion is applied with a torque wrench or the like around the axis in the direction opposite to that when the main body male screw portion 13 is screwed. Thus, the fixing strength of the screw member 10 with respect to the fixing target base material C can be evaluated by the rotational torque. That is, it is a fixing strength management method in which it can be confirmed that the screw member 10 exhibits proper fixing strength by confirming that the screw member 10 can endure (does not rotate) a constant rotational torque.

  In the above embodiment, the screw member 10 is a screw screw including the main body male screw portion 13, the rear end male screw portion 12, and the pin tail portion 11 in order from the front end side entering the anchor hole B of the base material C to be fixed. However, as long as the main body male screw portion 13 into which the screw thread bites into the inner surface of the anchor hole B is provided, the embodiment is not limited to this embodiment. As the screw member 10, for example, an anchor bolt or the like provided with a shaft portion having another shape and function instead of the rear end male screw portion 12 may be used.

  Another embodiment is shown in FIGS. 5 (a) and 5 (b). In this embodiment, as the groove portion 20, the first groove portion 20a extending from the front end of the main body male screw portion 13 toward the rear end, and the first groove portion extending from the front end of the main body male screw portion toward the rear end. The thing provided with the 2nd groove part 20b shorter than the length of 20a is employ | adopted. In this example, the first groove portions 20a and the second groove portions 20b are arranged in four equal portions alternately every 45 °.

5 (a) is, the groove depth of 20 is set shallower than the height of the peaks of the first threaded portion 13a, and has a depth that does not reach the top of the second threaded portion 13 c It is an example. The first groove 20a and second groove 20b of the groove 20 is formed only on the top portion of the first threaded portion 13a, the second threaded portion 13 c and valleys 13b, groove 20 is formed Not. 5 (b) is an example in which the groove portion 20 leading to the second threaded portion 13 c and valleys 13b. The first groove 20a and second groove 20b of the groove 20 is not only the first threaded portion 13a, is formed in the second threaded portion 13 c and valleys 13b.

  In these examples, since the first groove portions 20a and the second groove portions 20b are alternately arranged in the direction around the axis, particularly in the portion near the tip, the outer surface of the screw member 10 and the inner surface of the anchor hole B The filling of the binder A into the space between them is even smoother.

  Yet another embodiment is shown in FIGS. In this embodiment, the formation of the groove 20 is omitted. Such an embodiment can be adopted in the case of a specification that can exhibit a predetermined fixing strength without expecting the effect of the groove portion 20.

Experimental example

  Experimental examples are shown in FIGS. In this experimental example, in the fixing structure of the screw member having the above-described configuration, whether the screw member 10 actually has a predetermined fixing strength with respect to the base material C to be fixed is confirmed by a pull-out test. .

  As the screw member 10 serving as a test piece, an anchor bolt HUS-H14 × 60/70/80/90 having a nominal length of 160 mm, a main body outer diameter ds = 16.55 mm, and a main body shaft diameter dk = 12.6 mm was used. The material is carbon steel DIN EN 10263-4, 1.5523 (galvanized 5 μm).

  Specimen No. 1 to 30 are test pieces No. 1 to 80 at a depth of 80 mm of the anchor hole B. Nos. 31 to 60 were tested at an anchor hole B depth of 110 mm. Specimen No. As shown in FIG. 8 (a), Nos. 61 to 70 were tested in an anchor hole B provided with an enlarged diameter portion (inclined hole) having an inner surface inclined at an angle of about 15 degrees in the vicinity of the entrance. Specimen No. As shown in FIG. 8B, Nos. 71 to 80 were subjected to an experiment in an anchor hole B in which adjacent shallow perforated portions were connected to form an integral hole (enlarged hole).

FIG. 9 shows a specimen of the fixing target base material C used in the experimental example. Four anchor holes B are drilled on the bottom surface of a regular quadrangular prism having a height of 800 mm square in a plan view of 800 mm square, and the screw member 10 is screwed into the anchor hole B after injecting the binding material A into the four anchor holes B. It was. The target standard strength of concrete is 24 N / mm ² , the slump value is 12 cm, and the maximum coarse aggregate size is 25 cm. Reinforcing bars are placed inside. The bonding material A is HIT-RE500 epoxy adhesive, the drilling machine is a hammer drill TE30-M, the drill bit is a hollow bit Φ14, and the clamping machine is an impact wrench SIW 22T-A.

  The screwing depth of the screw member 10 into the anchor hole B is as shown in FIG. Specimen No. 1-10, no. 21-30, No. 41-50, no. The embedded depth of the screw members 10 of 61 to 80 is 70 mm. Specimen No. 11-20, no. 31-40, no. The embedding depth of the screw members 10 of 51 to 60 is 100 mm. Specimen No. Nos. 1 to 20 are downward construction, test piece No. Nos. 21 to 40 are side-by-side construction, test piece No. 41-80 are upward construction.

  The test results are shown in FIGS. 11a to 11c. In the pull-out test, a hydraulic tester that holds the head of the screw member 10 and applies a force in the direction of pulling from the fixing target base material C to the screw member 10 was used. Loading was continued from the start of the test until the screw member 10 was removed from the fixing target base material C or until the concrete of the fixing target base material C was cracked, and the meter value of the load was recorded.

  Test piece No. 1-20, No. for landscape construction. 21-40, No. of upward construction. 41-60, test piece No. of inclined hole construction. 61 to 70, test pieces No. In any of the specimens 61 to 70, not the fixing portion between the screw member 10 and the fixing target base material C, but the cone target base material C itself breaks at a portion away from the screw member 10 by a certain distance. The experiment is over. For this reason, it has been confirmed that the strength of the fixing portion between the screw member 10 and the fixing target base material C is higher than the strength of the fixing target base material C itself.

  In addition, test piece No. shown in FIG. Short 1 to short 10 are those in which the drilling depth of the anchor hole B is 80 mm, and the binding material A is filled only in the section of the deep part 40 mm. Also in this experiment, it was confirmed that the required pullout strength required was satisfied.

10 Screw member (screw screw)
11 Pin tail portion 11a Mountain portion 11b Valley portion 12 Rear end male screw portion 12a Screw thread portion 13 Main body male screw portion 13a Screw thread portion (first screw thread portion)
13b Valley portion 13c Screw thread (second thread thread)
14 tip part 14 a side face 14b end face 20 groove part 20a first groove part 20b second groove part A binder B anchor hole C fixing base material (concrete)
D thread groove

Claims (6)

An anchor hole (B) formed in a base material (C) to be fixed such as concrete, a screw member (10) having a main body male screw portion (13) inserted into the anchor hole (B), and the screw member (10) and a binder (A) interposed between the inner surface of the anchor hole (B),
The screw thread portion (13a) enters the spiral thread groove (D) formed on the inner surface of the anchor hole (B) by the spiral screw thread portion (13a) of the main body male screw portion (13), In addition, the binder (A) is interposed between the outer surface of the screw member (10) and the inner surface of the anchor hole (B), and the screw member (10) is fixed to the fixing target base material (C). The main body male screw portion (13) includes a screw thread portion (13a) and a second screw thread portion (13c) having a relatively lower thread height than the screw thread portion (13a). The fixing structure of the screw member which is a double thread screw provided alternately . The main male screw portion (13) groove along the axial direction (20) is formed on said Ri Contact enters the groove the binder (20) (A), the groove (20), the body male A first groove (20a) extending from the front end of the screw portion (13) toward the rear end, and a first groove (20a) extending from the front end of the main body male screw portion (13) toward the rear end. The screw member fixing structure according to claim 1 , further comprising a second groove (20b) shorter than the length. An anchor hole (B) formed in a base material (C) to be fixed such as concrete, a screw member (10) having a main body male screw portion (13) inserted into the anchor hole (B), and the screw member (10) and a binder (A) interposed between the inner surface of the anchor hole (B),
The screw thread portion (13a) enters the spiral thread groove (D) formed on the inner surface of the anchor hole (B) by the spiral screw thread portion (13a) of the main body male screw portion (13), In addition, the binder (A) is interposed between the outer surface of the screw member (10) and the inner surface of the anchor hole (B), and the screw member (10) is fixed to the fixing target base material (C). It is,
The main male screw portion (13) groove along the axial direction (20) is formed on said Ri Contact enters the groove the binder (20) (A), the groove (20), the body male A first groove (20a) extending from the front end of the screw portion (13) toward the rear end, and a first groove (20a) extending from the front end of the main body male screw portion (13) toward the rear end. fixing structure of the screw member Ru and a shorter than the length a second groove (20b).   The bottom surface of the trough (13b) between the threaded portions (13a, 13c) adjacent in the axial direction of the main body male threaded portion (13) is formed in a cross-sectional arc shape along the axial direction. The screw member fixing structure according to claim 3. A screw member fixing method using the screw member fixing structure according to any one of claims 1 to 4,
When the anchor hole (B) is drilled in the base material (C) to be fixed such as concrete and the screw member (10) having the main body male screw portion (13) is inserted into the anchor hole (B), A spiral thread groove (D) is formed on the inner surface of the anchor hole (B) by the spiral thread section (13a) of the main body male thread section (13), and the thread section (13a) is formed into the thread groove. (D) and the screw member (10) is fixed by interposing a binder (A) in a space between the outer surface of the screw member (10) and the inner surface of the anchor hole (B). The fixing method of the screw member fixed to a target base material (C). An anchor hole (B) formed in a base material (C) to be fixed such as concrete, a screw member (10) having a main body male screw portion (13) inserted into the anchor hole (B), and the screw member (10) and a binder (A) interposed between the inner surface of the anchor hole (B),
The screw thread portion (13a) enters the spiral thread groove (D) formed on the inner surface of the anchor hole (B) by the spiral screw thread portion (13a) of the main body male screw portion (13), In addition, the binder (A) is interposed between the outer surface of the screw member (10) and the inner surface of the anchor hole (B), and the screw member (10) is fixed to the fixing target base material (C). A fixing strength management method of a screw member used for a fixing structure of a screw member to be performed ,
The screw member (10) includes a torque management operation portion at a rear end thereof, and a shaft in a direction opposite to that when the screw member (10) is screwed into the anchor hole (B) in the torque management operation portion. A fixing strength management method for a screw member that evaluates the fixing strength of the screw member (10) with respect to the fixing target base material (C) by applying a rotational torque to the screw member (10).

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