JP6779566B2 - Post-construction anchor and its installation structure - Google Patents

Description

The present invention relates to a female screw type post-construction anchor installed in a concrete structure such as a bridge or a tunnel, and an installation structure thereof.

As post-construction anchors attached to concrete structures, male-screw type post-construction anchors and female-thread type post-construction anchors are known. An example of a male screw type post-construction anchor is shown in FIG. The post-construction anchor 110 of FIG. 9 is composed of a taper bolt 111 provided with a male screw portion 112 and a tapered portion 113 formed on the front side, and a sleeve 114 provided on the outer circumference of the taper bolt 111, and a slit 115 on the front side of the sleeve 114. The expansion portion 116 divided by is formed. In this male screw type post-construction anchor 110, by screwing the nut 117 attached to the male screw portion 112, the tapered portion 113 is inserted into the expansion portion 116, and the expansion portion 112 is expanded. There is.

The male screw type post-construction anchor 110 allows the tapered portion 113 of the taper bolt 111 to enter the expanding portion 116 of the sleeve 114 from the tip side to expand the expanding portion 116, so that when a pulling force is applied to the tapered bolt 111, the taper bolt 111 is expanded. A force in the expansion direction acts on the expansion portion 116 of the sleeve 114. Therefore, stable tensile strength can be exhibited, but there is a problem that the rear portion of the taper bolt 111 protrudes from the mounting surface and becomes an obstacle.

On the other hand, the female screw type post-construction anchor has an advantage that unnecessary bolt protrusion from the mounting surface can be eliminated. As such a female screw type post-construction anchor, a sleeve driving type and an internal cone driving type are generally known. FIG. 10 shows an example of a sleeve-driving type post-construction anchor. The post-construction anchor 120 of FIG. 10 is composed of a cone 121 having a tapered portion 122 formed on the front side and a sleeve 123 provided on the outer periphery of the cone 121, and an expansion portion divided by a slit 124 on the front side of the sleeve 123. 125 is formed, and a female screw portion 126 is formed inside the rear portion. In the post-construction anchor 120, by driving the sleeve 123 toward the tapered portion 122 of the cone 121, the expanding portion 125 of the sleeve 123 expands following the tapered portion 122, and the female screw portion 126 also expands. The mounting bolts that attach the mounting object to the taper are screwed together.

After that, since the construction anchor 120 is fixed to the concrete structure with a structure in which the cone 121 located at the tip and the mounting bolt are not connected, a force in the pulling direction acts only on the sleeve 123 when a pulling force is applied to the mounting bolt. To do. That is, there is a problem that the engagement state between the cone 121 and the sleeve 123 is released and the cone 121 easily falls off from the sleeve 123.

In addition, the internal cone driving type post-construction anchor has a cone with a tapered part formed on the front side inside the sleeve, and the cone is driven toward the tip to enter the inside of the expanding part of the sleeve. There is no danger that the cone will fall out of the sleeve. However, there is a problem that the expanding force is reduced by the amount of the internal cone, and the tensile strength is inferior to that of the post-construction anchor of the sleeve driving type having the same screw diameter.

Further, as a female screw type post-construction anchor, a sleeve driving type post-construction anchor shown in Patent Document 1 and FIG. 11 is also known. The post-construction anchor 130 of FIG. 11 has an inner member 131 having a tapered portion 132 and a tubular portion 133 on the front side and a female screw hole 134 formed inside the tubular portion 133, and an expansion divided by a slit 136 on the front side. It has an opening 137 and is composed of a sleeve 135 that is exteriorized by a cylinder 133. In the post-construction anchor 130, by driving the sleeve 135 toward the tapered portion 132 of the inner member 131, the expanding portion 137 of the sleeve 135 expands following the tapered portion 132, and the inner member also expands. A mounting bolt 141 for mounting the mounting object 142 is screwed into the female screw hole 134 of the 131.

The post-construction anchor 130 type anchor can eliminate unnecessary bolt protrusion from the mounting surface of the concrete structure 143, and the tapered portion 132 of the inner member 131 when a force in the pulling direction acts on the mounting bolt. Is pulled into the expansion portion 137 to follow and expand the expansion portion 137, so that the inner member 131 can exhibit stable tensile strength without fear of falling off from the sleeve 135, and is a male screw type post-construction anchor. And, it has the merits of both the sleeve driving type female screw type and the post-construction anchor.

Japanese Unexamined Patent Publication No. 3-2469

By the way, when constructing the female screw type sleeve driving type post-construction anchor 130, it is required to properly drive the inner member 131 to bring the expanding portion 137 into an appropriate expanding state. At present, the driving state is confirmed by the response of the operator, and the construction accuracy varies depending on the skill level of the operator. In particular, in the post-construction anchor 130, if the inner member 131 can properly expand the expansion portion 137 of the sleeve 135 and secure the fitting length M of the mounting bolt 141 and the predetermined screw of the female screw hole 134. The inner member 131 can be of any length. For example, when resin injection is applied to the space 144 inside the anchor, the rear end surface of the inner member 131 is located at a halfway hole depth position. It is very difficult to confirm the construction in the case where the position is in the proper construction condition (see FIG. 10 (b)).

Further, when the construction manager other than the worker who constructed the post-construction anchor 130 confirms after placing the post-construction anchor 130, there is a problem that it cannot be confirmed whether the construction is carried out in an appropriate expanded state until the post-construction anchor 130 is pulled. There is also.

The present invention is proposed in view of the above problems, and it is possible to reliably construct the post-construction anchor in an appropriate expanded state without relying on the skill level of the operator, and a person other than the operator can construct the anchor. It is an object of the present invention to provide a post-construction anchor and its installation structure capable of easily and surely confirming the construction of the anchor placement state.

The post-construction anchor of the present invention has an inner member having a tubular portion on the rear side and a tapered portion on the front side, and a female screw hole is formed inside from the rear end surface, and an expansion portion divided by a slit on the front side. A sleeve-driving type post-construction anchor including a sleeve to be exteriorized on the tubular portion, and on the inner circumference behind the expanded portion of the sleeve, on the rear end surface of the inner member in the expanded state. A marking portion indicating an appropriate position is provided, and a plurality of the marking portions are formed at intervals in the longitudinal direction of the sleeve .
According to this, if the sleeve is driven so that the rear end surface of the inner member comes to the position of the marking portion, it can be recognized that the driving state is proper. Therefore, the worker can surely construct the construction anchor in an appropriate expanded state without depending on the skill level of the worker, and it is easy for a person other than the worker to confirm the construction in the anchor placement state. And it can be done reliably. Further, when the sleeve is driven through a driving rod or the like, the rear end surface of the sleeve is hit, but by providing the marking portion on the inner circumference behind the expanded portion of the sleeve, the marking portion and the inner The female screw of the member is prevented from being damaged by the impact. Further, by forming a plurality of marking portions at intervals in the longitudinal direction of the sleeve, it is possible to apply a plurality of types of inner members having different lengths to the same sleeve. Then, when each of a plurality of types of inner members having different lengths is applied, the worker can reliably construct the later construction anchor in an appropriate expanded state without depending on the skill level of the worker. At the same time, a person other than the operator can easily and surely confirm the construction of the anchor placement state.

The post- construction anchor of the present invention has an inner member having a tubular portion on the rear side and a tapered portion on the front side, and a female screw hole is formed inside from the rear end surface, and an expansion portion divided by a slit on the front side. A sleeve-driving type post-construction anchor including a sleeve to be exteriorized on the tubular portion, and on the inner circumference behind the expanded portion of the sleeve, on the rear end surface of the inner member in the expanded state. A marking portion indicating an appropriate position is provided, and the marking portion is a groove or a step.
According to this, if the sleeve is driven so that the rear end surface of the inner member comes to the position of the marking portion, it can be recognized that the driving state is proper. Therefore, the worker can surely construct the construction anchor in an appropriate expanded state without depending on the skill level of the worker, and it is easy for a person other than the worker to confirm the construction in the anchor placement state. And it can be done reliably. Further, when the sleeve is driven through a driving rod or the like, the rear end surface of the sleeve is hit, but by providing the marking portion on the inner circumference behind the expanded portion of the sleeve, the marking portion and the inner The female screw of the member is prevented from being damaged by the impact. Further, for example , by rotating the work to be the sleeve and cutting the inner circumference, it is possible to easily and at low cost to form a groove or a step to be a marking portion.

The post-construction anchor of the present invention is characterized in that the female screw hole of the inner member is formed so as to penetrate to the front end surface.
According to this, the total length of the inner member can be shortened while ensuring the fitting length of a predetermined screw with the mounting bolt, and the component cost can be reduced.

The post-construction anchor installation structure of the present invention is a structure in which the post-construction anchor is installed according to the present invention, and the post-construction anchor is driven into a concrete structure at an embedding depth of 3 times or more the outer diameter of the sleeve. It is characterized by being.
According to this, by driving the post-construction anchor into the concrete structure at an embedding depth that is at least three times the outer diameter of the sleeve, it is possible to ensure that the concrete breaks when a force in the pulling direction is applied to the mounting bolt. Can be prevented. Then, when a force in the pulling direction is applied to the mounting bolt, the effect of the inner member exerting a force in the direction of expanding the sleeve can be surely obtained, and stable tensile strength is provided until the mounting bolt itself breaks. It can be reliably expressed.

According to the present invention, it is possible to reliably construct the post-construction anchor in an appropriate expanded state without depending on the skill level of the operator, and a person other than the operator can confirm the construction in the anchor placement state. It can be done easily and surely.

(A) is a perspective view of the post-construction anchor according to the first embodiment of the present invention, (b) is a front view thereof, and (c) is a vertical sectional view thereof. (A) is a perspective view of the post-construction anchor in the expanded state of the first embodiment, (b) is a front view thereof, and (c) is a vertical sectional view thereof. (A) to (d) are explanatory views explaining the construction process of the post-construction anchor of the first embodiment. (A) is a perspective view of the post-construction anchor according to the second embodiment of the present invention, (b) is a front view thereof, and (c) is a vertical sectional view thereof. (A) is a perspective view of the post-construction anchor in the expanded state of the second embodiment, (b) is a front view thereof, and (c) is a vertical sectional view thereof. (A) is a vertical cross-sectional view of the post-construction anchor according to the third embodiment of the present invention, and (b) is a vertical cross-sectional view of the expanded state. (A) is a front view of the post-construction anchor after the modified example of the first embodiment, and (b) is a vertical sectional explanatory view showing the installation structure of the post-construction anchor after the modified example. The perspective explanatory view which shows the inner member and the sleeve which attached the embedding depth marking in the construction anchor after the modification of the 1st Embodiment. Partial longitudinal front view showing the post-construction anchor of the conventional male screw type. Partial longitudinal front view showing the post-construction anchor of the conventional female screw type sleeve driving type. An explanatory cross-sectional view showing a post-construction anchor and concrete perforation in which a female screw hole is provided in the inner member of the conventional example, and (b) is a cross-sectional explanatory view showing a state in which the post-construction anchor is appropriately expanded in the perforation.

[Post-construction anchor of the first embodiment]
The post-construction anchor 1 according to the first embodiment of the present invention is a female screw type sleeve driving type, and has a rear cylindrical portion 21 and a front tapered portion 22 as shown in FIGS. 1 and 2. The inner member 2 has a cylindrical shape, and the tapered portion 22 is formed in a substantially conical shape whose diameter gradually increases toward the front. The inner member 2 has a female screw hole 24 formed inside from the rear end surface 23, and in the illustrated example, the female screw hole 24 is formed until it covers a part of the tapered portion 22.

A tubular sleeve 3 is exteriorized on the outer circumference of the tubular portion 21 of the inner member 2 in the non-expanded state. The sleeve 3 includes a sleeve body 31 and an expansion portion 32 provided on the front side of the sleeve body 31, and the expansion portion 32 is divided by a slit 33 cut from the front end of the outer sleeve 3 to the sleeve body 31. It is formed in a piece shape. A plurality of arcuate grooves 34 extending in the circumferential direction are formed on the outer surface of the expansion portion 32 in order to facilitate expansion deformation.

The inner circumference of the sleeve 3 on the rear side of the expanded portion 32, in other words, the inner circumference of the sleeve body 31 is provided as a marking portion indicating an appropriate position of the rear end surface 23 of the inner member 2 in the expanded state. Circumferential grooves 35p and 35q are formed along the circumference. In the present embodiment, a plurality of marking portions 35p and 35q are formed at intervals in the longitudinal direction of the sleeve 3, and in the illustrated example, two grooves are formed at positions closer to the rear of the sleeve body 31. 35p and a groove 35q are formed. Further, in the combination of the inner member 2 and the sleeve 3 having a predetermined length in the illustrated example, the sleeve 3 is driven so that the rear end surface 23 of the inner member 2 is arranged at a position corresponding to the groove 35p on the front side, thereby expanding. An appropriate expanded state of the opening 32 can be obtained (see FIGS. 2B and 2C).

Then, in the post-construction anchor 1 in the non-expanded state in which the expanded portion 32 is not expanded, the sleeve 3 is detachably fitted to the tubular portion 21 of the inner member 2 as shown in FIG. It is exteriorized. In the illustrated example, most of the expanded portion 32 of the sleeve 3 is detachably fitted to the tubular portion 21 of the inner member 2, so that the post-construction anchor 1 is configured in the non-expanded state.

When constructing the post-construction anchor 1 of the first embodiment, as shown in FIG. 3A, a perforation 61 is formed in the concrete structure 6 and the inside of the perforation 61 is cleaned. After that, as shown in FIG. 3B, the post-construction anchor 1 is inserted into the perforation 61 from the front end of the inner member 2, and the sleeve 3 protruding outward from the surface 62 of the concrete structure 6 is inserted into the dedicated driving rod 71. Is driven through the driving rod 71 by hitting with a hammer 72. By driving the sleeve 3, the expanding portion 32 expands following the outer circumference of the tapered portion 22.

Then, the sleeve 3 is driven in until the position of the rear end surface 23 of the inner member 2 and the position of the groove 35p on the front side of the sleeve 3 correspond to each other, and the expanded portion 32 is brought into an appropriate expanded state (FIG. 3 (c)). reference). The properly expanded expansion portion 32 bites into the hole wall of the perforation 61 so as to be pressed against the hole wall, and after the properly expanded state, the construction anchor 1 is fixed to the concrete structure 6. The fact that the expanded portion 32 is in an appropriate expanded state means that the position of the rear end surface 23 of the inner member 2 and the position of the groove 35p on the front side of the sleeve 3 correspond to each other in the sleeve 3. It can be confirmed by visual inspection by an administrator other than the operator.

Further, when the attachment 4 is attached to the concrete structure 6, as shown in FIG. 3D, the attachment 4 is arranged adjacent to the surface 62 of the concrete structure 6 and penetrates the attachment 4. In this way, the male screw portion 51 of the mounting bolt 5 is penetrated. Then, the male screw portion 51 is fixed to the concrete structure 6 and then screwed into the female screw hole 24 of the construction anchor 1, so that the attachment 4 is fixed to the concrete structure 6 and attached.

According to the first embodiment, it can be recognized that if the sleeve 3 is driven so that the rear end surface 23 of the inner member 2 comes to the position of the groove 35p corresponding to the marking portion, it is in a proper driving state. it can. Therefore, the worker can surely construct the construction anchor 1 in an appropriate expanded state without depending on the skill level of the worker, and a person other than the worker can confirm the construction of the anchor placement state. It can be done easily and surely.

Further, when the sleeve 3 is driven through the driving rod 71, the rear end surface of the sleeve 3 is hit, so that a groove corresponding to a marking portion provided on the inner circumference behind the expanded portion 32 of the sleeve 3 is provided. It is possible to prevent the female threads of 35p, 35q and the female thread hole 24 of the inner member 2 from being damaged by the impact.

Further, by forming a plurality of grooves 35p and 35q corresponding to the marking portions at intervals in the longitudinal direction of the sleeve 3, an inner member having a predetermined length different from that of the inner member 2 of the illustrated example is formed for the same sleeve 3. Even when the sleeve 3 is used, it is possible to obtain an appropriate expanded state by driving the sleeve 3 so that the position of the rear end surface of the inner member corresponds to the position of the groove 35q of the sleeve 3, and the lengths are different. A plurality of types of inner members 2 and the like can be applied. Then, when each of a plurality of types of inner members 2 having different lengths is applied, the worker surely constructs the later construction anchor in an appropriate expanded state without depending on the skill level of the worker. At the same time, a person other than the operator can easily and surely confirm the construction of the anchor placement state.

Further, by setting the marking portions to the grooves 35p and 35q, for example, by rotating the work serving as the sleeve 3 and cutting the inner circumference, the marking portion can be formed easily and at low cost.

[Post-construction anchor of the second embodiment]
The post-construction anchor 1a according to the second embodiment according to the present invention is also a female screw type sleeve driving type, and as shown in FIGS. 4 and 5, the inner member 2 is the same as that of the first embodiment. Further, the tubular sleeve 3a that is externally attached to the outer periphery of the tubular portion 21 of the inner member 2 is divided into a sleeve main body 31 and a slit 33 provided on the front side of the sleeve main body 31 as in the first embodiment. The expansion portion 32 and the arcuate groove 34 formed on the outer surface of the expansion portion 32 are provided.

The sleeve 3a in the second embodiment shows an appropriate position of the rear end surface 23 of the inner member 2 in the expanded state on the inner circumference on the rear side of the expanded portion 32, in other words, on the inner circumference of the sleeve main body 31. Circumferential steps 36p and 36q along the inner circumference are formed as marking portions. In the present embodiment, a plurality of steps 36p and 36q, which are marking portions, are formed at intervals in the longitudinal direction of the sleeve 3, and in the illustrated example, at the first step with intervals at positions closer to the rear of the sleeve body 31. Two steps, 36p, which extend outward, and 36q, which further extends outward in the second step, are formed. Further, in the combination of the inner member 2 and the sleeve 3a having a predetermined length in the illustrated example, the sleeve 3 is driven so that the rear end surface 23 of the inner member 2 is arranged at a position corresponding to the step 36p on the front side, thereby expanding. An appropriate expanded state of the opening 32 can be obtained (see FIGS. 5 (b) and 5 (c)).

Then, as in the first embodiment, the sleeve 3a is externally fitted to the tubular portion 21 of the inner member 2 so as to be detachably fitted, and the expanded portion 32 is not expanded and is not expanded. The construction anchor 1a is configured.

Further, the procedure of the steps of constructing the post-construction anchor 1a and attaching the attachment 4 in the second embodiment is basically the same as the procedure of the first embodiment and the post-construction anchor 1, but after the inner member 2. Instead of driving the sleeve 3 until the position of the end surface 23 and the position of the groove 35p of the sleeve 3 correspond, the sleeve 3 is moved until the position of the rear end surface 23 of the inner member 2 and the position of the step 36p on the front side of the sleeve 3a correspond. After driving in, the expansion portion 32 is set to an appropriate expansion state, and the post-construction anchor 1a is fixed to the concrete structure 6. The fact that the expanded portion 32 is in an appropriate expanded state means that the position of the rear end surface 23 of the inner member 2 and the position of the step 36p of the sleeve 3 correspond to each other in the sleeve 3a. It can be confirmed by visual inspection by an administrator other than the person.

According to the second embodiment, basically the same effect as that of the first embodiment can be obtained, and by forming a plurality of steps 36p and 36q corresponding to the marking portions at intervals in the longitudinal direction of the sleeve 3a. Even when an inner member having a predetermined length different from that of the inner member 2 in the illustrated example is used for the same sleeve 3a, the position of the rear end surface of the inner member corresponds to the position of the step 36q of the sleeve 3a. It is possible to obtain an appropriate expanded state by driving the sleeve 3a into the sleeve, and it is possible to apply a plurality of types of inner members 2 and the like having different lengths. Then, when each of a plurality of types of inner members 2 having different lengths is applied, the worker surely constructs the later construction anchor in an appropriate expanded state without depending on the skill level of the worker. At the same time, a person other than the operator can easily and surely confirm the construction of the anchor placement state.

Further, by setting the marking portions to the steps 36p and 36q, for example, by rotating the work to be the sleeve 3a and cutting the inner circumference, the marking portion can be formed easily and at low cost.

[Post-construction anchor of the third embodiment]
The post-construction anchor 1b according to the first embodiment according to the present invention is also a female screw type sleeve driving type, and as shown in FIG. 6, has a substantially cylindrical shape having a rear tubular portion 21b and a front tapered portion 22b. The inner member 2b is provided, the tubular portion 21b is shorter than the tubular portion 21 of the first embodiment, and the tapered portion 22b is formed in a substantially conical shape in which the diameter is gradually increased toward the front. The inner member 2b has a female screw hole 24b formed inside from the rear end surface 23b, and the female screw hole 24b is formed so as to penetrate to the front end surface 25b.

A tubular sleeve 3b is exteriorized on the outer circumference of the short tubular portion 21b of the inner member 2b in the non-expanded state. Similar to the first embodiment, the sleeve 3b has a sleeve main body 31, an expansion portion 32 divided by a slit 33 provided on the front side of the sleeve main body 31, and an arcuate groove formed on the outer surface of the expansion portion 32. Has 34.

The inner circumference of the sleeve 3b on the rear side of the expanded portion 32, in other words, the inner circumference of the sleeve body 31 is provided as a marking portion indicating an appropriate position of the rear end surface 23b of the inner member 2b in the expanded state. A plurality of circumferential grooves 35r, 35s, 35t along the sleeve 3b are formed at intervals in the longitudinal direction of the sleeve 3b. In the combination of the inner member 2b and the sleeve 3b having a predetermined length in the illustrated example, the sleeve 3b is driven so that the rear end surface 23b of the inner member 2b is arranged at the position corresponding to the groove 35r on the most front side, thereby expanding the inner member 2b. An appropriate expanded state of the portion 32 can be obtained (see FIG. 6B).

Then, in the post-construction anchor 1b in the non-expanded state in which the expanded portion 32 is not expanded, the tip portion of the sleeve 3b is detachably fitted to the tubular portion 21b of the inner member 2b so as to be externally fitted. The tip portion of the expanded portion 32 of the sleeve 3b is detachably fitted to the tubular portion 21b of the inner member 2b, so that the post-construction anchor 1b is configured in the non-expanded state. Further, the same procedure as that of the first embodiment and the post-construction anchor 1 can be used for the procedure of the step of constructing the post-construction anchor 1b and the attachment 4 of the third embodiment.

According to the third embodiment, basically the same effect as that of the first embodiment can be obtained, and a plurality of grooves 35r, 35s, 35t corresponding to the marking portions are formed at intervals in the longitudinal direction of the sleeve 3b. As a result, even when an inner member having a predetermined length different from that of the inner member 2b in the illustrated example is used for the same sleeve 3b, the position of the rear end surface of the inner member is the groove 35s or the groove 35t of the sleeve 3b. It is possible to obtain an appropriate expanded state by driving the sleeve 3ab so as to correspond to the position, and it is possible to apply a plurality of types of inner members 2b and the like having different lengths. Then, when each of a plurality of types of inner members 2b and the like having different lengths are applied, the worker surely constructs the later construction anchor in an appropriate expanded state without depending on the skill level of the worker. At the same time, a person other than the operator can easily and surely confirm the construction of the anchor placement state.

Further, by forming the female screw hole 24b of the inner member 2b so as to penetrate to the front end surface 25b, the total length of the inner member 2b can be shortened while ensuring the fitting length of a predetermined screw with the mounting bolt. , The parts cost can be reduced.

[Modified examples of embodiments]
The invention disclosed in the present specification is specified by changing these partial configurations to other configurations disclosed in the present specification to the extent applicable, in addition to each invention and each embodiment, or these. It includes a configuration specified by adding other configurations disclosed in the present specification, or a super-conceptualized configuration specified by deleting these partial configurations to the extent that a partial effect can be obtained. , Also includes the following modifications.

For example, in the marking portion of the present invention, in addition to the circumferential groove 35p formed along the inner circumference of the first to third embodiments, the step 36p formed in a circumferential shape along the inner circumference, and the like, It is applicable as long as it can show the proper position of the rear end surface of the inner member in the expanded state. For example, it is attached to a point-shaped recess formed at a predetermined position on the inner circumference of the sleeve and a predetermined position on the inner circumference of the sleeve. It can be a tape, a marking line provided at a predetermined position on the inner circumference of the sleeve, or the like.

In addition, when a plurality of marking portions having a predetermined width are provided, it is appropriate to drive the inner member so that the rear end surface of the inner member comes to be hidden by the width of the marking portion at the regulation position. You may set it as there is. Further, the direction in which the post-construction anchor of the present invention is placed is appropriate, such as an upward direction, a downward direction, a lateral direction, an obliquely upward direction, and an obliquely downward direction.

Further, in the post-construction anchor installation structure in which the post-construction anchor is installed in the concrete structure of the present invention, the post-construction anchor has an embedding depth of at least 3 times or more, more preferably 4 times or more the outer diameter of the sleeve. , It is preferable to drive it into a concrete structure for installation. FIG. 7 shows an example of a structure in which the construction anchor 1 is driven into the concrete structure 6 at an embedding depth L that is three times or more the outer diameter D of the sleeve 3 after the modification of the first embodiment. The post-construction anchor 1 of this modification has a further groove 35u on the front side of the groove 35p, and the sleeve 3 is arranged so that the rear end surface 23 of the inner member 2 having a predetermined length is arranged at a position corresponding to the groove 35p. It is the same as the post-construction anchor 1 of the first embodiment, which is a basic example, except that the configuration is such that an appropriate expansion state of the expansion portion 32 can be obtained by driving.

In this way, by driving the post-construction anchor 1 and the like into the concrete structure 6 with an embedding depth L that is three times or more the outer diameter D of the sleeve 3 and the like, the drawing direction is applied to the mounting bolt screwed into the post-construction anchor 1 and the like. It is possible to surely prevent the concrete from breaking when the force of the above is applied. Then, when a force in the pulling direction is applied to the mounting bolt, the effect of the inner member 2 or the like exerting a force in the direction of expanding the sleeve 3 or the like can be surely obtained, and the mounting bolt itself is stable until it breaks. Can reliably develop a high tensile strength.

When the post-construction anchor 1 or the like is driven into the concrete structure 6 with an embedding depth L of 3 times or more the outer diameter D of the sleeve 3 or the like, an appropriate embedding depth is provided in the rear end surface 23 or the like of the inner member 2 or the like. It is preferable to provide an embedding depth marking as a mark indicating. FIG. 8 shows three embedding depth markings 26 formed in a radial direction on the rear end surface 23 of the inner member 2 of the post-construction anchor 1 at predetermined intervals in the circumferential direction. .. In the illustrated example, three embedding depth markings 26 are engraved at intervals of approximately 90 degrees in the circumferential direction. There are three embedding depth markings 26 for so-called 3D anchors whose specification is that the embedding depth L is three times or more the outer diameter D, and so-called 4D where the embedding depth L is four times or more the outer diameter. In the specification anchor, set it to 4 so that the appropriate embedding depth L is shown.

Since the embedding depth marking 26 is provided on the rear end surface 23 of the inner member 2, there is no concern that the embedding depth marking 26 will be rubbed and disappear even if the rear end surface of the sleeve 3 is hit for anchoring. Of course, even when the sleeve 3 is driven in and expanded to complete the construction, it can be confirmed by looking into the sleeve 3 without being buried between the sleeve 3 and the hole wall. Therefore, when a person other than the operator confirms the corresponding state of the position of the rear end surface 23 of the inner member 2 and the position of the groove 35p or the like in the sleeve 3 and confirms that the construction state is appropriate, at the same time, It can be confirmed that the construction anchor 1 is placed at an appropriate embedding depth. As a result, even if the outer diameter D of the sleeve is the same, it is possible to perform more appropriate construction management in the female screw type sleeve driving type anchor in which an inner member having an arbitrary length may be used.

The present invention can be used, for example, when a post-construction anchor is installed on a concrete structure such as a bridge or a tunnel, or when an attachment is attached to a concrete structure by a post-construction anchor.

1, 1a, 1b ... Post-construction anchors 2, 2b ... Inner members 21, 21b ... Cylinders 22, 22b ... Tapered parts 23, 23b ... Rear end faces 24, 24b ... Female screw holes 25b ... Front end faces 26 ... Embedded depth marking 3, 3a, 3b ... Sleeve 31 ... Sleeve body 32 ... Expansion part 33 ... Slit 34 ... Arc-shaped groove 35p, 35q, 35r, 35s, 35t, 35u ... Groove 36p, 36q ... Step 4 ... Mounting object 5 ... Mounting bolt 51 ... Male screw part 6 ... Concrete structure 61 ... Drilling 62 ... Surface 71 ... Driving rod 72 ... Hammer 110 ... Post-construction anchor 111 ... Tapered bolt 112 ... Male thread part 113 ... Tapered part 114 ... Sleeve 115 ... Slit 116 ... Expansion part 117 ... Nut 120 ... Post-construction anchor 121 ... Cone 122 ... Tapered part 123 ... Sleeve 124 ... Slit 125 ... Expansion part 126 ... Female screw part 130 ... Post-construction anchor 131 ... Inner member 132 ... Tapered part 133 ... Cylinder part 134 ... Female screw hole 135 ... Sleeve 136 ... Slit 137 ... Expansion portion 141 ... Mounting bolt 142 ... Mounting object 143 ... Concrete structure 144 ... Space D ... Sleeve outer diameter L ... Embedded depth M ... Screw fitting length

Claims (4)

An inner member having a rear tubular portion and a front tapered portion and having female screw holes formed inside from the rear end surface,
A sleeve-driving type post-construction anchor having an expansion portion divided by a slit on the front side and a sleeve to be exteriorized on the cylinder portion.
A marking portion indicating an appropriate position of the rear end surface of the inner member in the expanded state is provided on the inner circumference behind the expanded portion of the sleeve .
A post-construction anchor characterized in that a plurality of marking portions are formed at intervals in the longitudinal direction of the sleeve . An inner member having a rear tubular portion and a front tapered portion and having female screw holes formed inside from the rear end surface,
A sleeve-driving type post-construction anchor having an expansion portion divided by a slit on the front side and a sleeve to be exteriorized on the cylinder portion.
A marking portion indicating an appropriate position of the rear end surface of the inner member in the expanded state is provided on the inner circumference behind the expanded portion of the sleeve.
It features and to a luer and construction anchor said marking portion is a groove or a step. The post-construction anchor according to claim 1 or 2 , wherein the female screw hole of the inner member is formed so as to penetrate to the front end surface. The post-construction anchor installation structure according to any one of claims 1 to 3 .
An installation structure of a post-construction anchor, characterized in that the post-construction anchor is driven into a concrete structure at an embedding depth of three times or more the outer diameter of the sleeve.

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