JP2011122393A - Insert fitting tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insert fitting tool in a simple structure, which can be used repeatedly, facilitates work, while reducing a unit cost of installation of the insert. <P>SOLUTION: The insert fitting tool includes a fitting bolt 2 threadingly fitted into an insert 1, a cylindrical inside holding body 4 covering the periphery of the fitting bolt 2 and having a male thread 4a formed on the outer periphery, and an outside holding body 5 arranged on the periphery of the inside holding body 4 and having a female thread 5a formed on the inner periphery to be threadingly suitable for the male thread 4a. A detent hole 4d engaged with a removing tool is arranged in the end of the inside holding body 4 on the side of a form 3, and an abutting face abutting on the side face of the insert 1 is formed on the other end. When the inside holding body 4 is rotated by the removing tool after placing concrete, the female thread 5a of the outside holding body 5 fixed to the concrete receives the rotational force by the male thread 4a, applies the rotational force to the outside holding body 5, allowing separation from the concrete. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an insert fixture that can leave only the body of an insert in the concrete when the bolt fixing insert is embedded in the concrete structure.

  When fixing bolts or suspension bolts to a concrete structure such as a concrete wall or ceiling, the insert is embedded in a predetermined position of the concrete structure, and a predetermined bolt is screwed and fixed. This insert is placed in a predetermined position from a mold in advance before placing concrete, and in this state, concrete is placed and embedded in the concrete. As an insert, a ceramic insert has been conventionally used, and a screw portion is provided, and a bolt is screwed into the screw portion.

  The conventional procedure for installing the insert will be described. The installation usually requires two workers. First, one of the two workers comes to the concrete placement side of the formwork, holds the insert, and matches the position of the insert support hole that has been previously opened in the formwork. On the other hand, another worker outside the mold inserts the bolt of the insert fixture into the insert support hole, and engages with the thread portion of the insert to fix the insert to the mold. Once the insert is cantilevered inside the formwork, the concrete is poured and after the concrete hardens, the bolts are removed and the formwork is removed. Thereafter, the above-described bolt is screwed into the insert left in the concrete.

  By the way, when concrete is poured into the above-mentioned formwork, if concrete is poured directly into the insert fixture, the bolt is buried in a fixed state in the concrete, and the bolt cannot be removed after the concrete is solidified. . Therefore, usually, a cylindrical holder is attached to the bolt, and an operation of attaching this is added to the above operation. The holder is made of ceramic, and the tip of the bolt is screwed with the insert, and is fixed between the mold and the insert. When the concrete hardens, only the bolts are removed from the inside, and the retainer is fixed to the concrete. Thus, the retainer remains with the insert in the concrete and remains embedded in the concrete. With this method, the holder cannot be reused.

  For this reason, one end is screwed with the female thread portion of the insert and the other end is formed with an engaging portion with the removal tool, one end is screwed with the other end of the holder, and the other is There has been proposed an insert device having an engaging portion that engages with a mold frame and a joint that includes a breaking portion therebetween and an engaging portion with a removal tool (see Patent Document 1).

  The insert device of Patent Document 1 can pull the formwork by pulling the formwork after placing the concrete, thereby breaking the breakage part of the joint and peeling off the formwork. Moreover, since the fracture is performed at the joint, the holder can be reused.

  However, in the insert device of Patent Document 1, even if the holder can be reused, the joint is discarded instead. In this case, only half was reusable, but not overall.

  In view of this, the present applicant has proposed an insert fitting that is screwed into the insert through a cylindrical holding body around the bolt and fixes the bolt to the mold with a nut (see Patent Document 2). In this proposal, an engagement portion that engages with the removal tool is provided at the end of the bolt on the formwork side, and a material having no affinity for concrete is used as the material of the holding body. Thus, the work can be performed by one person with a simple configuration, and the holder can be reused.

JP 2002-194819 A JP 2009-138473 A

  In the prior art, if there is no holding tool, the embedded bolt cannot be pulled out after the concrete is hardened. Therefore, although not preferred, conventionally, the retainer is used as a ceramic and is left in the concrete together with the insert. Therefore, the holder cannot be reused over and over.

  In this regard, the insert device of Patent Document 1 can reuse the holder. However, the joint is discarded instead of the holder. This is not a complete reuse, just a change in the parts. The structure is also complicated.

  On the other hand, the insert attachment tool of Patent Document 2 enables the use of the holding tool. However, new challenges have emerged. In other words, even if the material is selected, when the concrete hardens, the surface of the holding body has a physical and chemical affinity at the interface with the concrete, and it becomes difficult to remove. And as it is used more frequently, scratches and deposits are formed on the surface, and this part becomes the core and becomes familiar with the concrete, and it becomes difficult to separate from the concrete.

  Foreign substances other than ceramic cannot be left in the concrete, and the ceramic holder can be left in the concrete, but cannot be reused. Therefore, the cost becomes high. Also, it is expensive to dispose as a joint. There is a need for an inexpensive insert fitting that can be easily removed and used repeatedly on site with a simple configuration.

  Therefore, an object of the present invention is to provide an insert fitting that has a simple structure, can be used repeatedly, is easy to work, and can reduce the installation unit cost of the insert.

  The insert mounting tool of the present invention is an insert mounting tool that is screwed into a bolt fastening insert embedded in a concrete structure, is inserted into a mold and attaches the insert to the mold before placing the concrete. There are a mounting member screwed into the insert, a cylindrical inner holding body that covers the periphery of the mounting member and has a male screw portion formed on the outer periphery, and a female screw portion that is polymerized around the inner holding body and is formed on the inner periphery. An outer holding body that is formed and screwed to the male screw portion is provided, and an engagement portion that engages with the removal tool is provided at one end of the inner holding body on the mold side, and an insert at the other end. There is a contact surface that contacts the side surface of the insert during installation, and when the inner holder is rotated by the removal tool after the concrete is placed, the outer holder fixed to the concrete Threaded portion is mainly characterized to be detached from the rotational force to the concrete outside the holding member receives a rotational force by the male thread portion.

  According to the insert fixture of the present invention, it has a simple structure, can be used repeatedly, is easy to work, and can reduce the installation unit cost of the insert.

Partially crushed cross-sectional view when embedding an insert fixture in Embodiment 1 of the present invention (A) Axial front view of the inner holder of the insert fixture in Example 1 of the present invention, (b) Partial axial sectional view of the inner holder of (a) on the mold side Axial direction sectional view of an outside holder of an insert fixture in Example 1 of the present invention. Partial crush axis direction sectional drawing of the inner side holding body of the insert fixture in Example 1 of this invention The figure which shows the arrangement | positioning relationship of an outer side holding body and an inner side holding body when collect | recovering a holding body from the insert in Example 1 of this invention. Explanatory drawing of the process of collect | recovering a holding body from the insert in Example 1 of this invention.

  The first form of the best mode for carrying out the present invention is an insert fitting that is screwed into a bolt fastening insert embedded in a concrete structure and is inserted into the mold and attached to the mold before placing the concrete. The insert mounting tool is superposed on the mounting member to be screwed to the insert, the cylindrical inner holding body that covers the periphery of the mounting member and has an external thread formed on the outer periphery, and the inner holding body. A female screw part is formed on the inner periphery, and an outer holding body that is screwed with the male screw part is provided, and an engagement part that engages with the removal tool is provided at one end of the inner holding body on the mold side. The other end is provided with a contact surface that comes into contact with the side surface of the insert when the insert is installed. Is insert fitting, wherein the female threaded portion of the holding body is detached from the concrete added a rotational force to the outer holding member receives a rotational force by the male thread portion.

  With this configuration, the structure is simple and can be used repeatedly, the work is easy, and the cost of installing the insert can be reduced.

  A second form of the present invention is an insert attachment tool that is a form subordinate to the first form, wherein the outer periphery of the outer holding body forms a conical surface that expands toward the mold side. With a simple structure, the outer periphery of the outer holder can be easily separated from the concrete.

  A third form of the present invention is a form dependent on the first or second form, and includes an abutment surface on which an end portion on the insert side of the outer holding body abuts on a side surface of the insert when the insert is attached. The insert mounting tool is characterized in that concrete does not enter the periphery of the outer holding body and the insert, and the inner holding body.

  The fourth form of the present invention is a form dependent on any form of the first to third forms, wherein the axial width of the female screw portion of the outer holding body is the axis of the male screw portion of the inner holding body. It is an insert mounting tool that is formed wider than the width in the direction, and the position of the male screw part with respect to the female screw part is arranged closer to the mold side, and moves the outer holding body relative to the inner holding body. And the outer periphery of the outer holding body can be easily pulled away from the concrete.

  A fifth form of the present invention is a form subordinate to any one of the first to fourth forms, wherein the outer holding body is made of a plastic having an incompatibility with concrete. It is a featured insert fixture, can be used repeatedly at low cost, and the installation cost of the insert can be reduced.

  Hereinafter, the insert fixture in Example 1 of this invention is demonstrated. FIG. 1 is a partially crushed cross-sectional view when embedding an insert fixture in Embodiment 1 of the present invention, FIG. 2 (a) is an axial front view of an inner holder of the insert fixture, and FIG. 2 (b). FIG. 4 is a partial axial sectional view of the inner holding body of FIG. FIG. 3 shows an axial section of the outer holder, and FIG. 4 shows a partially broken axial section of the inner holder.

  1-4, 1 is an insert which becomes an anchor part for fixing a to-be-attached object by fixing a volt | bolt to concrete structures, such as a concrete wall and a ceiling, for example. 1a is a female screw for fixing a bolt formed in the insert 1, and 2 is a mounting bolt made of steel or stainless steel to be screwed into the female screw 1a of the insert 1 and attached to the mold 3 (attachment in the present invention) Member). In addition, this attachment bolt 2 is a bolt different from the bolt for fixing a to-be-attached object after hardening of concrete, and is a component of the insert attachment tool used at the time of concrete placement. Therefore, two types of bolts, that is, a bolt for fixing an object to be attached after curing and a work mounting bolt 2 are screwed into the female screw 1a.

  Since the insert 1 is used by being embedded in concrete for a long period of time, it is preferable to make it from a ceramic in terms of durability and strength. However, it can be made of a material such as hard plastic or metal. When using the mounting bolt 2, one end is screwed into the insert 1, and mounting is performed by sandwiching a mold frame with a holding member made of two members described later. When the screwing between the mounting bolt 2 and the insert 1 is released, the head of the mounting bolt 2 is rotated in the reverse direction with a spanner or the like to be released.

  The mounting bolt 2 is preferably a commercially available hexagon bolt. Hexagon bolts are easily available and inexpensive. However, a male screw 2a having the same pitch as that of the female screw 1a for screwing into the insert 1 needs to be formed on the mounting bolt 2.

  Next, 3 is a formwork for placing concrete. In addition, a fixing hole 3 a is opened in the mold 3 for attaching the mounting bolt 2. The fixing hole 3 a is opened to a size slightly larger than the mounting bolt 2. One end of the mounting bolt 2 is inserted into the fixing hole 3a, turns around to the opposite side of the mold 3, and is screwed with the female screw 1a of the insert 1 at the tip of the holding body to support the insert 1. In the first embodiment, this work can be sufficiently performed by one worker.

  1-4, 4 is a cylindrical member of uniform cross section arranged to secure the cover of the insert 1 (concrete thickness covering the surface of the insert 1 in the concrete structure), and the concrete adheres to it. Polyacetal (POM), polypropylene (PP), polyethylene (PE), etc. that are difficult to perform, and plastics such as fluororesins that have non-affinity to concrete (plastic that hardly adheres to concrete during concrete hardening) It is a cylindrical inner holding body that is easy to peel off from concrete and has strength and weak elasticity. It can be taken out and reused after placing concrete.

  Reference numeral 5 denotes an outer holding body that is nestled around the inner holding body 4 and screwed together. The male screw 4a (the male screw portion of the present invention) formed on the outer periphery of the inner holding body 4 and the female screw 5a (the female screw portion of the present invention) formed on the inner periphery of the outer holding body 5 are screwed together, They are assembled so that they both overlap in the axial direction. The outer support 5 is also easily peeled off from the concrete, such as polyacetal (POM), polypropylene (PP), polyethylene (PE), etc., which are hard to adhere to the concrete, and plastics such as fluororesins that have an incompatibility with the concrete, and It is preferable to integrally mold using a plastic material having strength and weak elasticity.

  The thickness of the inner holding body 4 is such that the cylindrical portion 4c on the insert 1 side is thinner than the cylindrical portion 4b on the mold 3 side, the tip of the cylindrical portion 4c is in-row processed, and the hole of the insert 1 is formed. It is fitted and the end surface of the tip is brought into contact with the locking surface 1b. Similarly, the end face of the outer holding body 5 is in contact with the side face of the insert 1. Here, the lengths of the inner holding body 4 and the outer holding body 5 are designed to be adjusted so that the end faces at both ends are in contact with the mold 3 and the insert 1, and are adjusted to the above-described length of the cover. Therefore, when the inner holding body 4 and the outer holding body 5 are overlapped and sandwiched between the mold 3 and the insert 1 and clamped with the mounting bolt 2, the insert 1 is disposed at a predetermined position from the mold 3 (the height of the cover). Can be secured).

  A packing 6 made of durable hard rubber or plastic is inserted between the mold 3 and the insert 1. The packing 6 has an insertion hole at the center, and prevents the concrete from leaking from the fixing hole 3a when the concrete is placed. As a material for the packing 6, plastics such as polyethylene (PE), polypropylene (PP), fluororesin, and rubber are suitable. The packing 6 is also collected after placing the concrete and can be used repeatedly. In FIG. 1, reference numeral 7 denotes a washer arranged when the mounting bolt 2 is mounted on the mold 3. The washer 7 may be made of hard rubber or plastic in addition to metal. Further, the washer 7 is useful in terms of not damaging the mold 3 and in terms of sealing, but it is not always necessary to dispose it.

  As shown in FIGS. 2A and 2B and FIG. 4, a detent hole 4 d having a slightly smaller diameter than the outer diameter is formed at the end of the inner holder 4 on the mold 3 side. The head of a removal tool such as a hexagon wrench is inserted into the rotation stop hole 4d and rotated. At this time, it is necessary to give the inner holding body 4 strength so that excessive twisting force concentrates on the minimum thickness portion and does not break. The thinnest part is the thickness at the apex of a polygon such as a hexagon as shown in FIGS. 2 (a) and 2 (b), and this part is against the torsion in view of the strength of the material of the inner holding body 4. In order to provide sufficient strength, the diameter should not be thinner than necessary. If it becomes thinner than this, it will be broken by the torque at the time of removal, and it will not function as the detent hole 4d.

  In contrast, the outer holding body 5 has a shape in which the outer peripheral surface 5c is a cone and a cylindrical hole 5b is formed in the center as shown in FIG. A female screw 5a is formed in a portion of the cylindrical hole 5b on the insert 1 side. The apex angle of the cone is very small and can be said to be almost a cylinder, but as a whole, it has a truncated cone shape with a through hole. As shown in FIG. 3, the axial width A of the female screw 5 a is formed narrower than the axial width B of the male screw 4 a of the inner holding body 4.

  Since the male screw 4a is attached to the insert 1 with the female screw 5a and the end portion on the insert 1 side aligned as shown in FIG. 1, when B> A, the end portion on the mold 3 side of the male screw 4a Is extended from the end of the female screw 5a on the mold 3 side by the threaded portion (B-A) until it approaches the mold 3. For this reason, when the male screw 4a rotates with respect to the female screw 5a, the outer holding body 5 can move (advance and retreat) within a range in which the movement of the screwing portion is allowed (B-A). The outer holding body 5 can be telescopically expanded and contracted as an entire shape by changing the screwing position in this range.

  However, in a state where the outer holding body 5 can be rotated as in the air, the force for performing such movement does not act. On the other hand, when the outer holding body 5 is fixed to the concrete as in the present invention, so to speak, when the inner holding body 4 maintains its position in the axial direction, a rotational force is applied to the male screw 4a. A reverse thrust R (see FIG. 6) acts on the outer holding body 5 in the rotational direction and the axial direction. That is, a force is applied to the outer holding body 5 to rotate the inner holding body 4 around the inner holding body 4 and move the outer holding body 5 to the mold 3 side by the action of the screw force. Furthermore, in the first embodiment, the outer holder 5 has an outer peripheral surface 5c inclined at an inclination angle θ with respect to the axial direction (see FIG. 3), and has a conical surface that expands toward the mold 3 side. When 4 is fastened to the insert 1, a component force N (see FIG. 6) in the direction perpendicular to the concrete surface acts as a tensile force. This force pulls the outer peripheral surface 5c away from the concrete in the vertical direction.

  Here, the specifications of the mounting bolt 2, the inner holding body 4, and the outer holding body 5 according to the first embodiment will be described. In FIG. 1, the axial width B of the male screw 4 a formed on the inner holding body 4 is twice the axial width A of the female screw 5 a of the outer holding body 5, that is, about A = 1/2 × B. The By making the axial width A narrower than B, the outer holding body 5 can slide around the inner holding body 4. When the axial width of the thin cylindrical portion 4b of the inner holding body 4 is C, the portion of the C axial width becomes an in-row portion and is fitted to the insert 1.

  Assuming that the mounting bolt 2 is 16 mm in diameter as an example, the outer peripheral diameter of the outer holding body 5 at the tip of the insert 1 side = 36 mm, the axial length of the outer holding body 5 = 50 mm, the axial length of the inner holding body 4 = 60 mm, A = 10 mm, B = 20 mm, C = 5 mm, the thickness of the cylindrical portion 4b of the inner holder 4 = 4 mm (therefore, the outer diameter of the cylindrical portion 4b is 24 mm), the thickness of the cylindrical portion 4c = 2 mm (therefore, the cylindrical portion 4c) The diameter of the outer circumference is preferably 20 mm). The inclination angle θ of the outer holder 5 is preferably about θ = 2 °. If it is smaller than θ = 1 °, the action of pulling the outer peripheral surface 5c away from the concrete is reduced, and it is not very useful for reinforcing the detent hole 4d at the time of removal. If θ = 5 ° or more, the shearing action acting on the interface along the outer peripheral surface 5c becomes small. Therefore, if possible, θ = 1 ° to 3 °, preferably θ = 2 ° is effective for detachment of the holder. is there. In addition, the axial direction width | variety of an inrow part should just be about 5 mm or more. Moreover, the thickness of the axial direction of the packing 6 of Example 1 is 5 mm.

  By the way, the feature of the insert fixture of the present invention is that the inner holder 4 and the outer holder 5 as well as the packing 6 can be removed from the concrete. That is, the holding body is divided into two members of an inner holding body 4 and an outer holding body 5 having a predetermined structure, and the outer holding body 5 can be moved forward and backward with respect to the inner holding body 4, thereby hardening the concrete. At times, the holder has been successfully detached from the concrete with a simple operation.

  Therefore, based on FIGS. 1, 5, and 6, the procedure for collecting the holding body in which the insert is installed and the inner holding body 4 and the outer holding body 5 are combined will be described below. FIG. 5 is a diagram showing an arrangement relationship between the outer holding body and the inner holding body when the holding body is recovered from the insert according to the first embodiment of the present invention, and FIG. 6 is an explanatory diagram of a process of recovering the holding body from the insert. is there.

  First, the attachment procedure will be described. A holding body including the inner holding body 4 and the outer holding body 5 is assembled in advance. That is, the inner holding body 4 is inserted into the outer holding body 5 and is screwed and overlapped so that the positions of the end portions of the two members on the mold 3 side are aligned, so that both are integrated as a holding body.

  Next, the mounting bolt 2 is inserted into the fixing hole 3 a of the mold 3 through the washer 7 so that the male screw portion 2 a side of the mounting bolt 2 protrudes from the mold 3. The packing 6 is inserted into the mounting bolt 2 protruding from the mold 3, and the holding body in which the inner holding body 4 and the outer holding body 5 are integrated is inserted and pushed in as shown in FIG. The female screw portion 1 of the insert 1 is screwed into the male screw portion 2 c at the tip of the inner holding body 4. The length of the outer holder 5 becomes the thickness of the concrete cover.

  The same result can be obtained even if the assembly is not performed by inserting the holding body integrated in advance, but by individual assembly, and the inner holding body 4 is inserted into the mounting bolt 2 and then the outer holding body 5 is screwed into the assembly. Get. However, it is easier to work in advance.

  In this way, the concrete is poured in a state where the insert 1 is supported on the mold 3 by the mounting bolt 2, the inner holding body 4 and the outer holding body 5, and after this is cured, the mounting bolt 2 is removed using a spanner.

  Next, as shown in FIG. 6, a removal tool such as a hexagon wrench is engaged with the anti-rotation hole 4 d and rotated in a direction to tighten the inner holding body 4. As a result, the inner holder 4 can be rotated at that position while being pressed against the insert 1. The action of the screw produces a sufficiently large pressing force F. The inner holding body 4 stays in this position and rotates. On the other hand, the reverse thrust R acts on the outer holding body 5 by the screw force of the inner holding body 4. This is because the outer holder 5 cannot be rotated because it is fixed to the concrete, and rotates in the reverse direction by the screw force and tries to move in the opposite direction (attempts to move backward toward the mold 3 side). . Considering the component force of the reverse thrust R, the component force N in the direction perpendicular to the outer peripheral surface 5c acts as a force for separating the outer peripheral surface 5c from the concrete, and the inner holding body 4 and the outer holding body 5 are integrally formed from the concrete. Peel and separate. Further, the component force H along the surface also acts as a shearing force on the interface between the concrete and the outer holding body 5. The concrete interface is more fragile to tension than compression and detachment occurs relatively easily. As a result, the two-part holding body can be easily separated from the concrete and the insert 1. The above bolt removal and holding body removal operations can be performed by one person.

  In FIG. 5, the male screw 4 a of the inner holding body 4 is rotated, and the outer holding body 5 is pushed by the axial width Δ toward the mold 3 in the axial direction of the inner holding body 4, and separated from the concrete surface by a distance δ. Indicates the state. An integrated holding body with a loose degree of fixation in a concrete hole can be easily removed. After these removals, a cavity (space) remains, and only the insert 1 remains inside.

  After this, the filling is packed into the cavity. The filling material may be packed after fixing the bolt for fixing the attachment object. The material of the filling may be any material such as mortar or plastic.

  As described above in the first embodiment, the present invention divides the holding body for holding the mounting bolt 2 into two members, the inner holding body 4 and the outer holding body 5 having a predetermined structure. Is configured to be able to move forward and backward with respect to the inner holding body 4, and when the concrete is hardened, the holding body including the inner holding body 4 and the outer holding body 5 can be easily detached from the concrete by a simple operation. be able to. Since it has a simple structure, it is inexpensive and can be used repeatedly because it is taken out after use. This can reduce the installation cost of the insert.

  The present invention can be applied to an insert fixture for attaching an insert to a formwork.

DESCRIPTION OF SYMBOLS 1 Insert 1a Female screw 2 Mounting bolt 2a Male screw 3 Mold 3a Fixing hole 4 Inner holding body 4a Male screw 4b Cylindrical part 4c Cylindrical part 4d Non-rotating hole 5 Outer holding body 5a Female screw 5b Cylindrical hole 5c Outer peripheral surface 6 Packing 7 Washer θ Inclination angle A, B, C, Δ Axial width δ Distance F Pushing force R Reverse thrust N, H Component force

Claims (5)

An insert fixture that is screwed into an insert for fastening a bolt embedded in a concrete structure, is inserted through a mold and attaches the insert to the mold before placing the concrete,
The insert fitting is superposed on an attachment member to be screwed to the insert, a cylindrical inner holding body that covers the periphery of the attachment member and has a male screw portion formed on the outer periphery, and a circumference of the inner holding body. A female screw part is formed on the inner periphery, and the outer holding body is screwed with the male screw part,
An engagement portion that engages with the removal tool is provided at one end portion of the inner holding body on the mold side, and a contact surface that contacts the side surface of the insert when the insert is attached is provided at the other end portion. And
When the inner holding body is rotated by the removal tool after the concrete is placed, the female screw portion of the outer holding body fixed to the concrete receives the rotational force from the male screw portion and applies the rotational force to the outer holding body. In addition, an insert fixture characterized in that it is detached from the concrete.   The insert fixture according to claim 1, wherein an outer periphery of the outer holding body forms a conical surface that expands toward the mold side.   The insert mounting tool according to claim 1 or 2, wherein an end portion of the outer holding body on the insert side includes a contact surface that comes into contact with a side surface of the insert when the insert is mounted.   The axial width of the female screw portion of the outer holding body is formed narrower than the axial width of the male screw portion of the inner holding body, and the entire position of the female screw portion with respect to the male screw portion is on the insert side. The insert fitting according to any one of claims 1 to 3, wherein the insert fitting is arranged close to the other.   The insert fixture according to any one of claims 1 to 4, wherein the outer holding body is made of a plastic having an incompatibility with concrete.

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