JPH116231A - Slab structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slab using dry construction method, to uses a slab structure excellent in shear rigidity and shear resistance in preventing a building from undergoing shear deformation within a horizontal plane, and to provide a structure having the slab structure which has excellent resistance to horizontal forces. SOLUTION: A floor or roof slab is formed by fixing lightweight concrete panels 1 on a horizontal member 2 (2a) using a fixing member 5. In that case, joint parts 4 are used to prevent the plurality of lightweight concrete panels from moving relative to one another, thus forming a unit that is integrated to resist horizontal shear stresses applied to the slab, with the lower surfaces of the corners of the unit reinforced by reinforcing plates 6, and with the corners secured to the horizontal member 2 through the reinforcing plates 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floor or roof slab structure constructed using lightweight concrete panels.

[0002]

2. Description of the Related Art As a technique for increasing the horizontal rigidity of a floor slab constructed by laying lightweight concrete panels, for example, the technique shown in Japanese Patent Application Laid-Open No. 7-207797 and FIG. 8 is known. That is, according to this technique, a cotter 54 filled with mortar 57 is provided on joints 53 on the long side and the short side of the lightweight concrete panel 51, and the entire floor is integrated, and joints are provided via screws 55 having an annular portion at the head. Reinforcing bar 5
6 are arranged along the entire length of the long joint of the lightweight concrete panel 51, and the joint 53 is filled with mortar 57 so that the lightweight concrete panel 51 is
2 is a slab structure fixed to the slab. Also, JP-A-8-2
As shown in Japanese Patent No. 84296 and FIG. 9, an anchor plate 63 is fixed to a reinforcing bar mat 62 in a lightweight concrete panel 61 in advance, and the screw member 64 penetrates the anchor plate 63 so that the screw member 64 passes through the lightweight concrete panel 61. Is a slab structure fixed to the horizontal member 65.

[0003]

However, in the structure disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 7-207797, filling of the entire joint between the panels with mortar is a wet method, for example, filling the joint with the mortar. Mortar takes time to harden, and it is not possible to start the next process immediately after filling, the process of kneading the mortar is indispensable, the problem that a storage space for materials and a kneading space are required, the mortar Quality is difficult to obtain because it is affected by the ambient temperature, it is difficult to obtain a certain strength, the problem is that the wet construction method may pollute the site, and it is necessary to protect the surroundings when it rains. There are various problems such as the problem of becoming.

[0004] When a very large in-plane deformation of the slab is to be caused by a large earthquake or a very strong wind load, the panel of the face material has higher horizontal rigidity than the grid beam of the wire. A difference in deformation is likely to occur between the beam and the beam, and the stress generated by the difference in deformation is concentrated on a fixed portion between the panel and the beam. When this fixation is performed with a screw member, the tip end of the screw member screwed into the beam material tries to move horizontally from the panel penetrating portion together with the beam material, and the screw member moves to the panel base material around the penetrating portion on the lower surface of the panel. As a result, a concentrated load is applied to split the panel. Simply fixing a panel with low base material strength, such as a lightweight concrete panel, with a screw member, in particular, causes this concentrated load to be a unit body consisting of multiple panels that are in contact with the entrance and exit corners and columns of the slab. At the corner of the slab, and the concentrated load easily cracks at this corner at an early stage, thereby reducing the horizontal strength and the horizontal rigidity of the slab.

[0005] In the structure disclosed in Japanese Patent Application Laid-Open No. 8-284296, a force from the skeleton is received by the anchor plate and the reinforcing bar mat integrated with the lightweight concrete panel via the screw member, so that the mounting strength is high. Although this method has the advantage that the anchor plate is installed at a distance from the upper end of the beam in this method, bending stress is generated in the screw member between the anchor plate and the upper end of the beam, and the lightweight concrete panel When the tensile strength of the base material is low, the base material below the anchor plate collapses early due to the bearing force of the screw member, leading to bearing failure and splitting failure, so that horizontal rigidity cannot be increased. A point was left.

Further, since the anchor plate is previously installed in the lightweight concrete panel, the mounting position of the screw member is determined at the time of manufacturing the panel, and the mounting position is changed at the construction site or the long panel is cut. It was difficult to respond flexibly, such as making a short panel. The present invention has been made in view of the above-described circumstances, and realizes a slab by a dry method, and suppresses a building from being shear-deformed in a horizontal plane by a slab structure having excellent shear rigidity and shear strength. It is an object of the present invention to provide a building having a slab structure having excellent resistance to slabs.

[0007]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is intended to provide a floor or roof slab in which lightweight concrete panels are fixed on a horizontal member with fixing members. By preventing the lightweight concrete panels from being displaced from each other at joints, a unit body integrated with respect to the horizontal shear stress applied to the slab is formed, and the lower surface at the corner of the unit body is reinforced by a reinforcing plate. The fixing of the corner to the horizontal member is performed through the reinforcing plate. When the planar shape of the lightweight concrete panel is rectangular, at least the joints in the long side direction between the lightweight concrete panels may be prevented from shifting, and the joints also do not shift in the short side direction between the lightweight concrete panels. Is more preferable.

Further, the method of the present invention for preventing the joints from shifting is a method of forming a columnar fixing member having a shape capable of drilling a hole across the joints of the lightweight concrete panels and driving and fitting the holes. Preferably, a tool is snapped into the hole. It is more effective to provide a transverse member supporting the lightweight concrete panel with two intermediate beams at both ends and at least one intermediate beam in addition to the both ends of the lightweight concrete panel. The corners of the unit body are, for example, portions that are in contact with the entrance and exit corners and pillars of the slab, and the reinforcing plate used for the lower surface of the corner of the unit body is a plate-like, lightweight concrete panel. It has a higher proof stress and plays a role of reinforcement. The reinforcing plate is fixed to the back surface of the lightweight concrete panel in advance by using an adhesive or the like, and then, in a portion where the reinforcing material is present, of the panel where the reinforcing material is fixed, the reinforcing material is fixed to the corner transverse member through the reinforcing material. Is done.

[0009]

Embodiments of the present invention will be described.
The lightweight concrete panel used in the present invention is mainly used for wooden or steel floors, roofs, and the like, and has a thickness of 35 mm to 1 reinforced inside with a reinforcing bar or a lath net.
50mm, length 600-3000mm, width 300-65
A lightweight cellular concrete panel having a thickness of about 0 mm can be used, and a lightweight cellular concrete panel called an ALC panel having a thickness of 75 mm or more is used.

The horizontal member used in the present invention supports both ends of the short side of the lightweight cellular concrete panel, and may be made of wood or steel. In the case of wooden horizontal members, those having a width of 90 to 120 mm are generally used. In the case of a wooden horizontal member, it is preferable that the fixing bracket is directly driven into the horizontal member. However, if there is a special design requirement, for example, a 50 mm square wooden member may be used as the wooden horizontal member. It may be sufficiently fixed, and a fixing bracket may be attached to this square member. In the case of a steel horizontal member, the width is 100 to 200.
H-shaped steel with a height of 200 to 400 mm is often used. Generally, a lip with a thickness of about 1 to 4 mm is attached to the upper surface of a horizontal steel member so that screws can be easily driven in. It is preferable to fix a base material such as a slotted steel and attach screws to the base material.

The fixing member used in the present invention is used for fixing a lightweight cellular concrete panel to a horizontal member, and is preferably a screw or a nail, particularly preferably a self-drilling screw. This fixing member fixes the lightweight cellular concrete panel in the vertical direction, transmits the horizontal force applied to the building in the event of an earthquake, etc. to the lightweight cellular concrete panel, and uses the horizontal shear resistance of the lightweight cellular concrete panel to construct the frame. This is to prevent the skeleton of the body from being sheared in the horizontal direction. The unit body of the present invention is configured by connecting the joints of the lightweight cellular concrete panels with an adhesive or a cotter, etc., and preventing the joints from shifting in the horizontal direction against horizontal shear stress applied to the slab. . In the case where the planar shape of the lightweight cellular concrete panel is rectangular, a unit body can be formed by preventing displacement of joints in the long side direction, but if the displacement of joints in the short side direction is also prevented, the finished surface of the slab is cracked. This is preferable because it does not cause adverse effects such as bending.

In the method using an adhesive, the joints are bonded by applying an adhesive to the small face of the lightweight concrete panel, and the adhesiveness is highest when applied to the entire surface of the small piece. The cotter is a wet cotter using mortar (this is not to fix the entire joint part with mortar, but to provide a hole that partially straddles the panels on both sides, that is, to provide a cotter, and to use mortar only for this cotter) and a cylindrical body Any method can be used as long as it suppresses misalignment, such as a dry cotter in which a dry cotter is implanted and buried. Among them, it is preferable to use a dry cotter which is a completely dry method and has good workability. The dry-type cotter may extend about 1/2 to 2/3 of the thickness or penetrate the lightweight concrete panel 1 downward in the thickness direction of the lightweight concrete panel 1 across the joint, and drill a hole having a diameter of about 20 to 50 mm. A cylindrical body having a diameter larger than the hole, a length shorter than the depth of the hole, and having a hollow or solid cross-sectional shape is driven and embedded using a hammer. The material of the cylindrical body may be a material that does not cause a large deformation when the lightweight concrete panel around the cylindrical body bears the horizontal shear force, and metal, wood, concrete or plastic is used. can do. Further, about 2 to 5 cotters are provided at positions apart from both ends of the joint, and the larger the number, the higher the effect of preventing joint displacement.

The reinforcing plate used in the present invention is fixed in advance to the periphery of the fixing member on the lower surface of the lightweight concrete panel so that the horizontal shear stress transmitted from the horizontal member is input to the reinforcing plate from the fixing member. After being dispersed by the area of the reinforcing plate, it is transmitted to the lower surface of the lightweight concrete panel, thereby preventing bearing bearing and splitting failure of the lightweight concrete panel. Further, since the reinforcing position of the reinforcing plate is prevented from misalignment between the panels by the above-mentioned unit body being formed, the stress concentration point of the unit body, that is, only the corners may be reinforced with the reinforcing plate. Good. In general, the corners of the unit body often become the entrance and exit corners of the slab and pillars.

As a material of the reinforcing plate, a material having a sufficiently large proof strength as compared with a lightweight concrete panel such as a metal plate and a hard plastic plate is used. The thickness of the reinforcing plate may be determined so that the reinforcing plate is not broken by a horizontal shear force transmitted from the fixing bracket to the reinforcing plate, for example, 0.4 to 6 m.
A metal plate such as a steel plate of about m is preferable. In addition, the width and length of the reinforcing plate may be determined in terms of an area appropriate for securing a fixing force required for fixing the panel and the reinforcing plate with an adhesive or the like, and a construction error, and the thickness of the reinforcing plate, By properly designing the size and shape, it is possible to improve rigidity and proof strength against a horizontal load. For example, it is preferable that the size is equal to or larger than the interlocking portion between the lightweight concrete panel and the horizontal member, because at the time of construction, the fixing member can be attached in a wide range and the construction is easy.

As a method of fixing the reinforcing plate to the lightweight concrete panel, a method using an adhesive 8 as shown in FIGS. 4 and 5 and a projection 10 provided on the reinforcing plate 6b as shown in FIG. A method of driving the lightening concrete panel 1 into the lightweight concrete panel 1, or a method of fastening with a nail or a screw (not shown), a method of embedding a reinforcing plate in advance under the thickness of the lightweight concrete panel and at a position where the fixing member can penetrate, and these Can be used in combination. Further, as the adhesive 8, an epoxy resin-based or silica-alumina-based adhesive having high rigidity at the time of curing can be used.

The intermediate beam used in the present invention is for supporting other than the both ends of the lightweight concrete panel, and may be made of wood or steel. For wooden horizontal members,
Those having a width of 45 to 120 mm are generally used,
In the case of a steel horizontal member, an H-section steel having a width of 100 to 200 mm and a height of 100 to 400 mm is often used. or,
If a cotter is also provided at the joint on the intermediate beam and the lightweight concrete panel is also fixed to the intermediate beam by the fixing member, the fixing member on the intermediate beam suppresses the opening of the joint against horizontal load. Therefore, there is no gap around the cotter material, and the dry cotter can function effectively.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the slab structure according to the present invention will be specifically described with reference to the drawings. FIG. 1 is a plan view of a slab of a wooden building, in which a large number of lightweight cellular concrete panels 1 are placed on a horizontal member 2 and joints between adjacent lightweight cellular concrete panels against horizontal shear force applied to the slab. Three unit bodies are configured by preventing the 4 from shifting.

One unit body is enlarged with reference to FIGS. 1 and 2, and a first embodiment of the slab structure of the present invention will be specifically described. 75 mm thick with a reinforcing bar inside, length 182
0mm, 600mm wide lightweight cellular concrete panel 1
Are mounted in parallel on wooden horizontal members 2a, 2b. The horizontal members 2a and 2b are constructed in parallel with each other so that the lightweight cellular concrete panel 1 is supported at both ends of the short side and at the center in the long side direction. The horizontal members 2a supporting both ends of the short side of the lightweight cellular concrete panel 1 are called beams or girders, and have a width of 105 mm,
The cross member 2b having a cross section of a height of 270 mm and supporting a central portion in the long side direction of the lightweight cellular concrete panel is called a beam, a small beam or an intermediate beam, and has a width of 90 mm.
mm and 90 mm in height.

The lightweight cellular concrete panel 1 has a diameter of 6
The self-drilling screw 5 having a length of 120 mm and a length of 120 mm is fixed to the transverse member 2 by driving the self-drilling screw 5 from the upper surface of the lightweight cellular concrete panel 1. Both ends of the short side of the lightweight cellular concrete panel 1 are 80 mm from the long side and 40 m from the short side.
m is fixed to the girder 2a by the self-drilling screw 5 at each of two places, and the central part in the long side direction of the lightweight cellular concrete panel 1 is fixed to the small beam 2b by the self-drilling screw at two places of 80 mm from the long side. ing. Further, the number of the self-drilling screws 5 is not limited to the above-mentioned number, and it is preferable that a large number of the self-drilling screws 5 be driven to improve mounting strength.

A method for preventing displacement of the panel joint will be described with reference to FIGS. As shown in FIG. 6, straddling the long side joints 4 between adjacent lightweight cellular concrete panels,
A hole 9 having a depth of about 45 mm and a diameter of 33 mm is drilled downward in the thickness direction of the lightweight cellular concrete panel 1.
A dry-type cotter 7 in which a metal pipe 7b of 4 mm, a length of 40 mm, and a thickness of 3.2 mm is driven into the hole with a hammer to bury the metal pipe 7b so that the long side joints 4 between adjacent lightweight cellular concrete panels do not shift. A unit body is configured. Further, the dry cotter 7 is provided at a position 300 mm from both ends of the short side of the lightweight cellular concrete panel 1 and on the intermediate beam at the center in the length direction. or,
If a large number of cotters are provided in addition to this, the effect of preventing displacement of joints is improved. As a method of preventing displacement of joints, there are other methods of bonding with an adhesive and a method of wet cotter.However, as a completely dry method, a method of bonding with a dry cotter, a method of bonding with an adhesive, and a method of combining these may be used. it can.

As shown in FIGS. 2 to 4, and 5, the corners of the unit body, such as around the pillar and the entrance and exit corners, are previously thickened along the short side on the back side of the lightweight cellular concrete panel 1. A zinc-plated metal reinforcing plate 6a having a thickness of 0.8 mm, a length of 595 mm, and a width of 60 mm is fixed by an adhesive 8,
The lightweight cellular concrete panel 1 is fixed to the horizontal member 2 with self-drilling screws 5 via the reinforcing plate 6a. Various adhesives such as an epoxy resin type and a silica alumina type can be used as the adhesive 8, but in this embodiment, a silica-alumina type adhesive having high rigidity at the time of curing and excellent in workability because of a one-part type. Use agents. If the reinforcing plate is temporarily fastened with a nail or the like at the time of bonding, when the lightweight cellular concrete panel is carried in or built in, the reinforcing plate is not peeled off or misaligned due to insufficient curing of the adhesive, thereby facilitating construction.

Referring to FIG. 3, a second embodiment of the slab structure according to the present invention will be described as follows. Generally, the displacement of the short side joint 4a with respect to the load in the horizontal direction is smaller than the displacement of the long side joint 4, but if the short side joint 4a is prevented from being displaced by the dry cotter 7a or the like, the finished surface of the slab can be formed. This is preferable because it does not cause adverse effects such as cracks and bending. Short side joint 4
The dry-type cotter 7a provided in a performs the same construction as that of the first embodiment described above at the position of the joint 4a in the short side direction between the lightweight cellular concrete panels at the center in the width direction of the lightweight cellular concrete panel 1.

[0023]

Since the slab structure according to the present invention has the above-described structure and operation, it has the following great effects. In particular, at the corners where the slab comes in and out of the slab of the unit body composed of a plurality of panels and the corners that are in contact with the pillars, that is, where the shear load due to the horizontal force is concentrated, the periphery of the fixing member on the lower surface of the lightweight concrete panel is previously determined. By attaching the reinforcing plate to the panel, the load transmitted from the horizontal member to the fixing member is distributed to the area of the reinforcing plate and transmitted to the lower surface of the lightweight concrete panel against the shear stress in the horizontal direction. Bearing and splitting failures at the concrete panel mounting portion are effectively prevented. Therefore, when a horizontal force is applied to the building, the slab is excellent in shear rigidity and shear strength against the horizontal force.

Further, by forming a unit of a lightweight concrete panel integrated with the horizontal shear stress applied to the slab, if only the corners of the unit are reinforced as described above, the shear rigidity and the shear of the slab can be improved. Since the proof strength can be maintained, the construction labor and the number of members of the reinforcing plate can be reduced as compared with the case where all the lightweight concrete panels are reinforced. In addition, since the reinforcing plate may be installed on the lightweight concrete panel immediately before the panel is laid, the mounting position can be easily changed at the construction site. If the lightweight concrete panel has a rectangular planar shape, by preventing displacement of joints in the long side direction, a unit of lightweight concrete panel integrated with the horizontal shear stress applied to the slab can be constructed, and the shear stiffness of the slab And shear strength can be maintained.

By suppressing displacement of joints in the short side direction in addition to joints in the long side direction between adjacent lightweight concrete panels, adverse effects such as cracks and bending on the finished surface of the slab are prevented. Holes are drilled across the joints between the lightweight concrete panels, and a columnar fixing tool having a slightly larger outer diameter than the holes is inserted into the holes to completely prevent displacement at the joints. Since it is a dry construction method, it is not necessary to wait for the mortar to be hardened, as compared with the wet construction method using a mortar as in the conventional example, and the next step can be sequentially advanced, and the construction period can be shortened. In addition, stable quality and performance can be obtained without being affected by the weather. Space for mixing mortar and space for storing materials is not required, and the space on site can be used effectively. Further, the work environment can be favorably maintained by preventing on-site contamination by water or the like.

By adding an intermediate beam to the support of the lightweight concrete panel, the intermediate beam can be fixed to the intermediate beam by a fixing member, so that the mounting strength can be improved, and the joints can be prevented from opening against in-plane deformation. Therefore, no gap is generated around the cotter material, and the dry cotter can work effectively. In addition, since the load applied to the furniture and the person in the vertical downward direction is also borne by the intermediate beam, the lightweight concrete panel can be made thinner by an appropriate design. Furthermore, when an impact force is applied vertically downward, such as when a child jumps, the intermediate beams can suppress the bending deformation of the lightweight concrete panel, and reduce the transmission of the impact sound to the lower floor. The addition of an intermediate beam shortens the beam spacing, making it easy to temporarily place lightweight concrete panels during loading and construction, and also secures a foothold for the constructor, so that workability is good and it is easy to prevent falling to lower floors So safe.

[Brief description of the drawings]

FIG. 1 is a plan view of a slab structure according to the present invention.

FIGS. 2A and 2B are plan views or cross-sectional views of one unit body of the first embodiment.

FIG. 3 is a plan view of one unit body of a second embodiment of the slab structure according to the present invention.

FIG. 4 is a longitudinal sectional view of a main part showing a positional relationship between a reinforcing plate and a fixing member.

FIG. 5 is an explanatory perspective view of a main part showing a positional relationship between a reinforcing plate and a fixing member.

FIG. 6 is an explanatory perspective view of a main part showing a method for preventing joint displacement of a lightweight concrete panel.

FIG. 7 is an explanatory perspective view showing an embodiment of a method of fixing a reinforcing plate.

FIG. 8 is a plan view showing a first conventional example.

FIG. 9 is a longitudinal sectional view showing a second conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Lightweight cellular concrete panel 2 Wooden cross beam 2a Wooden girder 2b Wooden girder 3 Wooden column 4 Long side joint of lightweight cellular concrete panel 4a Joint of short side direction of lightweight cellular concrete panel 5 Self drill screw 6 Reinforcement plate 6a Reinforcement plate 6b Reinforcement plate 7 Dry cotter 7a Dry cotter 7b Metal pipe 8 Adhesive 9 Drilled hole 10 Projection 51 Lightweight concrete panel 52 Horizontal member 53 Joint 54 Cotter 55 Screw with annular portion at head 56 Reinforcing bars 57 Mortar 61 Lightweight concrete panels 62 Reinforcement mats 63 Anchor plates 64 Screw members 65 Horizontal members 66 C-shaped steel

Claims (5)

[Claims] 1. A floor or roof slab in which a lightweight concrete panel is fixed on a horizontal member by a fixing member, by preventing a plurality of the lightweight concrete panels from being displaced from each other at joints. A unit body integrated with the applied horizontal shear stress is formed, and the lower surface of the corner of the unit body is reinforced by a reinforcing plate, and the fixing of the corner to the horizontal member is performed through the reinforcing plate. A slab structure characterized by: 2. The slab structure according to claim 1, wherein a plane shape of the lightweight concrete panel is rectangular, and a joint in a long side direction between the lightweight concrete panels is not shifted. 3. The slab structure according to claim 2, wherein joints in the short side direction between the lightweight concrete panels are not shifted. 4. A horizontal force is formed by drilling a hole across the joints between the lightweight concrete panels and driving and fitting a cylindrical fixing member having a shape capable of being driven and fitted into the hole. Claim 1 wherein the gap is not shifted at the joint.
4. The slab structure according to any one of items 1 to 3. 5. The horizontal member supporting the lightweight concrete panel is provided with two intermediate beams and at least one intermediate beam in addition to the both ends at the both ends of the lightweight concrete panel. The slab structure described in.