JP2007092438A - Floor slab installing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a floor slab installing method for quickly and correctly carrying out height adjustment of a floor slab while always ensuring a stable state of the floor slab, and preventing a floor slab bearing member from being scratched. <P>SOLUTION: According to the floor slab installing method, a nut 20 is embedded in a vertically penetrating hole 10a secured in the precast concrete floor slab 10, and a height adjusting bolt 30 is screwed into the nut 20. The height adjusting bolt 30 has a universal mechanism 33 capable of oscillating in an arbitrary direction, which is arranged at a distal end 32 thereof, and a male screw 31a screwable into the female screw of the nut 20, which is formed on a body 31. Then an end face 32a of the distal end 32 is abutted on an upper surface 40a of the floor slab bearing member 40 by applying an even pressure to adjust the height of the precast concrete floor slab 10, and in this manner the precast concrete floor slab 10 is installed on the floor slab bearing member 40. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a floor slab installation method for installing a precast concrete floor slab on a floor slab support member.

  Conventionally, when installing a precast concrete floor slab on a floor slab support member, in order to adjust the height of the floor slab to be installed, a support such as a liner plate or a hard sponge is installed on the floor slab support member. Install the floor slab.

  In addition, a height adjustment bolt is screwed into a nut embedded in the upper and lower through holes provided in the precast concrete floor slab, and the tip of the height adjustment bolt is brought into contact with the upper surface of the floor slab support member to increase the height of the floor slab. There is also a technique for adjusting the thickness (see Japanese Patent Application No. 2004-237865).

  However, when the floor slab is warped or uneven, or when there is a slope or unevenness on the upper surface of the floor slab support member on which the floor slab is installed, according to the technology that adjusts the height of the floor slab using a support. There may be a gap between the installed floor slab and the support. When such a gap is generated, the contact area between the floor slab and the support becomes extremely small, so that the installed floor slab may be in an unstable state. Further, in the height adjustment method using the liner plate, it is necessary to repeatedly perform the adjustment work of the liner material, so that it takes a lot of construction time to install the floor slab horizontally.

  Moreover, according to the technique proposed in Japanese Patent Application No. 2004-237585, although fine height adjustment is easier than the technique of adjusting the height of the floor slab using a support, and the construction time is shortened, When the height of the floor slab is adjusted, the tip of the height adjusting bolt rotates, so that the top surface of the floor slab support member with which the tip abuts may be damaged. For this reason, for example, when a platform is constructed by placing a floor slab on a steel floor slab support member in an environment with salt damage, such as a coastal area, the damaged part of the steel material damaged by the height adjustment bolt This causes the problem of corrosion.

  In view of the above circumstances, an object of the present invention is to provide a floor slab installation method in which the height adjustment of a floor slab is always performed quickly and accurately in a stable state, and damage to the floor slab support member is prevented. Is.

  In the floor slab installation method of the present invention that achieves the above object, a precast concrete floor slab is provided with an upper and lower through hole, a nut is embedded concentrically in the upper and lower through hole, and a universal mechanism that can swing freely in an arbitrary direction is provided. A height adjusting bolt provided at the front end is screwed onto the nut, the end surface of the front end is brought into contact with the upper surface of the floor slab support member to adjust the height of the floor slab, and the floor slab is adjusted to the floor slab. It is characterized by being installed on a support member.

  Here, the precast concrete floor slab of the present invention is, for example, a precast PC floor slab in which prestress is introduced into concrete with an embedded PC steel material, a reinforced concrete precast RC floor slab, or a cement system such as concrete or mortar. High-strength precast concrete floor made of fiber-reinforced cement-based composite material containing short fibers that are formed into needle-like synthetic fibers such as steel fibers and carbon fibers or synthetic resin fibers such as polyester fibers and aramid fibers in a hardened material Refers to the version.

  In the floor slab installation method of the present invention, the height adjustment bolt that is screwed into the nut embedded in the upper and lower through-holes has a universal mechanism that can swing freely in any direction. In adjusting the height of the floor slab using the adjusting bolt, the end surface of the tip end portion comes into contact with the upper surface of the floor slab support member with equal pressure. Therefore, for example, when there is warpage or unevenness in the floor slab, or when there is a gradient or unevenness on the upper surface of the floor slab support member on which the floor slab is installed, the height of the floor slab is adjusted using a support. According to the floor slab installation method of the present invention, the floor slab installation method according to the present invention can adjust the height of the floor slab quickly and accurately in a stable state even in situations where a great amount of construction time is required. It can be carried out. Moreover, the installation state after adjusting the height of the floor slab can always be stably maintained. Furthermore, even if the height adjustment bolt is further screwed in after the tip end face of the height adjustment bolt abuts the top surface of the floor slab support member to adjust the height, the tip end side does not rotate at the boundary of the universal mechanism. Therefore, it is possible to prevent the top surface of the floor slab support member with which the end face of the tip end abuts from being damaged which may cause corrosion.

  Here, in the floor slab installation method of the present invention, the height adjustment bolt has a circular cross section of the male screw contacting the female screw, thereby reducing friction between the female screw of the nut and the male screw of the height adjusting bolt. Therefore, the height adjustment of the precast concrete slab, which is a heavy object, can be easily performed, which is preferable.

  According to the present invention, the height adjusting bolt that is screwed into the nut embedded in the upper and lower through holes provided in the precast concrete floor slab is provided with a universal mechanism that can swing in any direction at the tip. In adjusting the height of the floor slab using the height adjusting bolt, the end face of the tip end portion comes into contact with the upper surface of the floor slab support member with equal pressure. Therefore, the height adjustment of the floor slab can be performed quickly and accurately in a stable state, and the installation state after the height adjustment of the floor slab can always be stably maintained. In addition, even if this height adjustment bolt is further screwed in after the end surface of the height adjustment bolt abuts the top surface of the floor slab support member, the tip end side will not rotate at the boundary of the universal mechanism. It is possible to prevent the upper surface of the floor slab support member in contact with the end face from being damaged which may cause corrosion.

  Prior to describing the embodiments of the present invention, the problems of the conventional floor slab installation method for installing a precast concrete floor slab using a support will be analyzed.

  FIG. 12 is a side view showing a first example of a state in which the precast concrete floor slab 70 is installed on the floor slab support member 90 by construction by a conventional floor slab installation method, and FIG. 13 shows a second example of the state. It is a side view.

  12 and 13 show a state in which the precast concrete floor slab 70 is installed on the floor slab support member 90 via a support 80 such as a liner plate or a hard sponge.

  As shown in FIG. 12, when the upper surface 90a of the floor slab support member 90 on which the precast concrete floor slab 70 is installed is horizontal, it is easy to install the precast concrete floor slab 70 horizontally.

  However, when there is a gradient on the upper surface 90 a of the floor slab support member 90, a gap may be generated between the precast concrete floor slab 70 and the support 80 installed as shown in FIG. 13. When such a gap occurs, the contact area between the precast concrete floor slab 70 and the support 80 becomes extremely small, and the installed precast concrete floor slab 70 may be in an unstable state. Further, in the height adjustment method using the liner plate for the support 80, it is necessary to repeatedly perform the adjustment work of the liner material. Therefore, it takes a lot of construction time to install the precast concrete floor slab 70 horizontally.

  In FIG. 13, an example in which a gradient exists on the upper surface 90 a of the floor slab support member 90 is described. However, for example, when the precast concrete floor slab 70 is warped or uneven, or the upper surface of the floor slab support member 90 The same problem may occur even when there is unevenness at 90a.

  Although not shown, a height adjustment bolt is screwed into a nut embedded in the upper and lower through holes provided in the precast concrete floor slab, and the tip of the height adjustment bolt is brought into contact with the upper surface of the floor slab support member. A technique for adjusting the height of the floor slab is also known. According to such a technique, although the fine height adjustment is easier than the floor slab installation method shown in FIGS. 12 and 13, and the construction time can be shortened, the height of the floor slab is adjusted. Since the tip of the height adjusting bolt rotates, the top surface of the floor slab support member with which the tip abuts may be damaged. For this reason, for example, when a platform is constructed by placing a floor slab on a steel floor slab support member in an environment with salt damage, such as a coastal area, the damaged part of the steel material damaged by the height adjustment bolt This causes the problem of corrosion.

  The present invention solves such a conventional problem, and an embodiment of the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram for explaining a floor slab installation method to which an embodiment of the present invention is applied, in which a precast concrete floor slab 10 is installed on a floor slab support member 40 by construction using the floor slab installation method. It is the see-through | perspective side view which saw through a part of from the side. 2 is an enlarged view of the nut 20 shown in FIG. 1, and FIG. 3 is an enlarged view of a portion A of the height adjusting bolt 30 shown in FIG.

  The precast concrete floor slab 10 shown in FIG. 1 is provided with three or more upper and lower through holes 10a, and the nut 20 shown in FIG. 2 is embedded concentrically in each of the upper and lower through holes 10a. FIG. 1 shows one vertical through hole 10a among these three or more vertical through holes 10a. The precast concrete floor slab 10 is, for example, a precast PC floor slab, a precast RC floor slab, a high-strength precast concrete floor slab, or the like.

  As shown in FIGS. 1 and 3, the height adjusting bolt 30 is coupled to a main body portion 31 having a male screw 31 a that is screwed into a female screw of the nut 20 via a universal mechanism 33 that can swing freely in an arbitrary direction. It is comprised from the front-end | tip part 32 which was made. In addition, the height adjusting bolt 30 has a cross section of a male screw 31 a that contacts the female screw of the nut 20 in an arc shape. Such a height adjustment bolt 30 is screwed into the nut 20, and the end surface 32 a of the tip 32 is brought into contact with the upper surface 40 a of the floor slab support member 40 such as a steel beam with equal pressure, The precast concrete floor slab 10 is installed on the floor slab support member 40. The height adjusting bolt 30 is made of, for example, an SCM435 material.

  First, with reference to FIGS. 4-6, the process of fitting the main-body part 31 of the height adjustment bolt 30 shown in FIG. 1, FIG. 3 to the front-end | tip part 32 is demonstrated.

  4 is a side view showing a state before the main body 31 of the height adjusting bolt 30 shown in FIGS. 1 and 3 is fitted to the tip 32, and FIGS. 5 and 6 show the main body 31 shown in FIG. It is a side view which shows the state after fitting to the front-end | tip part 32. FIG.

  As shown in FIG. 4, a spherical convex portion 31 b is provided at a fitting portion between the height adjustment bolt 30 and the distal end portion 32 of the main body portion 31. Further, a recessed portion 32 b that fits with the protruding portion 31 b is provided at a fitting portion of the tip end portion 32 of the height adjusting bolt 30 with the main body portion 31. The size of the opening 32c of the recess 32b is slightly smaller than the diameter of the projection 31b of the main body 31.

  The tip 32 of the height adjustment bolt 30 configured in this way is heated. By heating the tip 32, the opening 32c of the recess 32b is thermally expanded, and the projection 31b of the main body 31 can be fitted into the recess 32b of the tip 32.

  The opening 32c of the recess 32b is contracted by so-called shrinking processing, in which the recessed portion 32b of the heated tip 32 is fitted to the protrusion 31b of the main body 31 and then cooled, and the height adjustment is performed as shown in FIG. The main body 31 and the tip 32 of the bolt 30 are joined.

  As shown in FIG. 6, the height adjustment bolt 30 that couples the main body 31 and the tip 32 is coupled via a universal mechanism 33 that can swing in any direction.

  Next, with reference to FIGS. 7-11, each process of the floor slab installation method to which one Embodiment of this invention was applied is demonstrated.

  FIG. 7 is a see-through side view of a part of the precast concrete floor slab 10 also shown in FIG.

  As shown in FIG. 7, a nut 20 is embedded in the upper and lower through holes 10 a provided in the precast concrete floor slab 10 concentrically with the upper and lower through holes 10 a.

  FIG. 8 is a transparent side view of the state in which the height adjusting bolt 30 is inserted into the upper and lower through holes 10a provided in the precast concrete floor slab 10 shown in FIG.

  The precast concrete floor slab 10 shown in FIG. 7 is temporarily installed on the floor slab support member 40. In the upper and lower through-holes 10a of the precast concrete floor slab 10 temporarily installed on the floor slab support member 40, a high mechanism provided with a universal mechanism which can be swung in any direction obtained through the steps shown in FIGS. The height adjusting bolt 30 is inserted so that the end surface 32 a of the tip end portion 32 of the height adjusting bolt 30 contacts the upper surface 40 a of the floor slab support member 40. Note that the precast concrete floor slab 10 in which the height adjusting bolt 30 is inserted in the upper and lower through holes 10 a in advance may be temporarily installed on the floor slab support member 40.

  FIG. 9 is a transparent side view of a state in which the height of the precast concrete floor slab 10 is adjusted using the height adjusting bolt 30 shown in FIG.

  The male screw 31a of the main body 31 of the height adjusting bolt 30 and the female screw of the nut 20 are screwed and screwed, and the end surface 32a of the tip 32 of the height adjusting bolt 30 is brought into contact with the upper surface 40a of the floor slab support member 40. The height adjustment bolt 30 is formed by connecting the main body 31 and the tip 32 through a universal mechanism 33 that can swing in an arbitrary direction, so that the end surface 32 a of the tip 32 is formed by the floor support member 40. It will contact | abut to the upper surface 40a with a uniform pressure. Therefore, for example, when the precast concrete floor slab 10 is warped or uneven, or when there is a gradient or unevenness on the upper surface 40a of the floor slab support member 40 on which the precast concrete floor slab 10 is installed, FIG. According to the construction by the conventional floor slab installation method shown in FIG. 13, the height adjustment of the precast concrete floor slab 10 can be performed quickly and accurately in a stable state even in a situation where a great amount of construction time is required. . Moreover, the installation state after adjusting the height of the precast concrete slab 10 can be always stably maintained.

  Thereafter, the height of the precast concrete floor slab 10 is adjusted by further screwing the height adjusting bolt 30, and the precast concrete floor slab 10 is installed on the floor slab support member 40.

  Even if the height adjustment bolt 30 is further screwed in after the end surface 32a of the tip end portion 32 of the height adjustment bolt 30 abuts against the upper surface 40a of the floor slab support member 40, the universal mechanism 33 is used as a boundary. Since the distal end portion 32 side does not rotate, the upper surface 40a of the floor slab support member 40 with which the end surface 32a of the distal end portion 32 abuts is prevented from being damaged which may cause corrosion.

  Further, as described with reference to FIG. 1, the height adjustment bolt 30 has a male screw 31 a in contact with the female screw of the nut 20 and the cross section of the male screw 31 a has an arc shape. Friction with 30 male threads 31a is reduced, and the height adjustment of the precast concrete floor slab 10, which is a heavy object, can be easily performed.

  FIG. 10 is a perspective side view of the state in which the height adjusting bolt 30 shown in FIG. 9 is removed seen from the side.

  As shown in FIG. 10, after the concrete 50 is placed in the space between the precast concrete floor slab 10 and the floor slab support member 40, the height adjusting bolt 30 is removed.

  FIG. 11 is a see-through side view of a state in which the upper and lower through holes 10a provided in the precast concrete floor slab 10 are closed from the side.

  As shown in FIG. 11, a mortar 60 is placed in the upper and lower through holes 10a provided in the precast concrete floor slab 10 to close the upper and lower through holes 10a.

It is the see-through | perspective side view which saw through a part of the state which installed the precast concrete floor slab on the floor slab support member from the side surface. It is an enlarged view of the nut shown in FIG. It is an enlarged view of the A section of the height adjustment bolt shown in FIG. It is a side view which shows the state before fitting the main-body part of the height adjustment bolt shown in FIG. 1, FIG. 3 to a front-end | tip part. It is a side view which shows the state after fitting the main-body part shown in FIG. 4 to the front-end | tip part. It is a side view which shows the state after fitting the main-body part shown in FIG. 4 to the front-end | tip part. FIG. 2 is a see-through side view of a part of the precast concrete slab shown in FIG. It is the see-through | perspective side view which saw through the state which inserts a height adjustment volt | bolt in the up-and-down through-hole provided in the precast concrete floor slab shown in FIG. It is the see-through | perspective side view which saw through the state which adjusts the height of a precast concrete floor slab using the height adjustment bolt shown in FIG. It is the see-through | perspective side view which saw through the state which removes the height adjustment bolt shown in FIG. 9 from the side surface. It is the see-through | perspective side view which saw through the state which plugged up and down the through-hole provided in the precast concrete floor slab from the side. It is a side view which shows the 1st example of the state which installed the precast concrete floor slab on the floor slab support member by construction by the conventional floor slab installation method. It is a side view which shows the 2nd example of the state which installed the precast concrete floor slab on the floor slab support member by construction by the conventional floor slab installation method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Precast concrete floor slab 10a Up-and-down through-hole 20 Nut 30 Height adjustment bolt 31 Main-body part 31a Male screw 31b Convex part 32 Tip part 32a End surface 32b Recessed part 32c Opening part 33 Universal mechanism 40 Floor slab support member 40a Upper surface 50 Concrete 60 Mortar 70 Precast Concrete floor slab 80 Bearing 90 Floor slab support member 90a Upper surface

Claims (2)

  A precast concrete floor slab is provided with upper and lower through holes, nuts are embedded concentrically in the upper and lower through holes, and a height adjusting bolt having a universal mechanism that can swing freely in any direction is screwed onto the nut. The floor slab is installed on the floor slab support member by adjusting the height of the floor slab by bringing the end face of the tip portion into contact with the top surface of the floor slab support member. .   The floor slab installation method according to claim 1, wherein the height adjustment bolt has an arc shape in a cross section of an external thread contacting the internal thread.

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