JPH084253A - Steel sleeper - Google Patents

Abstract

PURPOSE:To prevent a local buckling by forming a sleeper of substantially reversed trapezoidal section consisting of a steel square pole material, setting the width of the upper surface of the sleeper larger than the width of the lower surface, and forming reinforcing ribs on both the lateral side surfaces. CONSTITUTION:A thin plate steel is formed into a substantially reversed trapezoidal section to form a steel sleeper 1, and the steel sleeper 1 has two grooves 3 on the upper surface 2 for supporting a joist 7 and two ribs 5 formed along the longitudinal direction on the lateral side surfaces 4. The bottom part of the beam 1 is supported by the receiving piece 10 of a strut 9 of adjustable height, and the joist 7 is fixed to the upper surface of the beam 1 by a small screw. Thus, a clearance is difficult to be formed between the joist lower surface and the support surface part of the sleeper upper surface, and the creaking of a floor can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in construction of a floor base.

[0002]

2. Description of the Related Art Conventional steel bar pulls used for steel floors are generally made of square pipes having a rectangular or square cross section, and have various diameters depending on the strength required for the floor to be constructed. Used.

[0003]

However, if the strength of the steel bar pull is to be improved as described above, the diameter of the bar pull increases and the material cost increases.

When a thin steel plate is used for a large diameter, especially when it is vertically long, the left and right side parts swell or return as shown in FIG. 9 each time a load is applied from above. May make a strange noise. For this reason, it is necessary to use a steel material having a plate thickness to some extent in the conventional steel drawing, which also leads to an increase in material cost.

Further, in the above-mentioned steel raft, when the wooden joists are fixed by screwing or the like, when the joists repeatedly contract and expand due to changes in temperature and humidity, the contact surfaces of the joists and the haul pull close to each other and escape. Since there is no gap, it will gradually create a gap. This gap causes a slight rubbing between the contact surfaces when a load is applied to the floor, and causes floor squeaking.

In view of the above-mentioned various problems of the conventional steel hauling, the present invention uses a thin steel material and has substantially the same strength with a cross-sectional area smaller than the conventional cross-sectional area.
Moreover, it is a first object of the present invention to provide a steel-made pulling wire which reliably prevents generation of abnormal noise due to bulging and returning of both side surfaces.

Further, in addition to the above-mentioned object, the present invention is to provide a steel pulling which prevents the generation of floor squeal due to expansion and contraction of a wooden joist when used together with the wooden joist.

[0008]

In order to achieve the above-mentioned first object, the present invention is made of steel prismatic material, and the width of the upper surface supporting the joists is smaller than the width of the lower surface supported by the bundle. It is characterized in that it is formed in a substantially inverted trapezoidal cross section, and reinforcing ribs are formed on both left and right side surfaces along the longitudinal direction.

The invention according to claim 2 is the above-mentioned 2
In order to achieve the second object, in addition to the above configuration, a feature is that a groove into which a fixing tool such as a screw for fixing joists is screwed is formed in the upper surface along the longitudinal direction.

A plurality of grooves and reinforcing ribs may be provided.

[0011]

In this large pull, when fixing the wooden joist, when the fasteners such as screws are screwed so that the tip of the screw is fixed to the groove bottom of the upper surface, the lower surface of the joist is on both sides of the upper surface of the pull. Supported by the groove and the groove. A gap is formed between the fastening portion such as a screw and the lower surface of the joist. Therefore, when the wood of the joist is deformed due to contraction and expansion, the fastening portion of the fastener pulls the groove bottom portion and bends it upward in the gap. On the other hand, when the wood material of the joist is returned to its original shape, the fastening portion of the fixing tool such as a screw returns the original position by sinking the groove bottom portion bent upwards as shown below. Therefore, the close contact portion between the bottom surface of the joist and the top surface of the large pull is not affected by the contraction of the wooden joist.

Since the reinforcing ribs are formed on both side surfaces, even if a thin plate material is used, the side surface is not bent by a load from above. Even if the cross-sectional shape is inverted trapezoidal, the strength will be almost the same as that of a rectangular steel or rectangular steel cross-section with an upper surface that is the same width as the upper surface of the main pulling, so material costs will be saved accordingly. To be done.

Grooves are formed on both sides of the reinforcing ribs along the length direction of the large pull. This groove is used as a recess for accommodating, for example, a connecting plate for connecting the large pull in the lengthwise direction so as to straddle both the large pull ends. By screwing on the connecting plate, the connecting members are firmly joined together without the connecting member protruding from the side surface of the connecting member. The above-mentioned groove on the upper surface can also be used as a similar connecting plate accommodating recess.

[0014]

The present invention will be described below in detail with reference to the illustrated embodiments. FIG. 1 is a schematic diagram of a steel large pull 1 according to an embodiment of the present invention.
In the cross-sectional view of FIG. 1, this large drawing is formed by forming a thin steel plate into a substantially inverted trapezoidal cross-section. On the upper surface 2 that supports the joist 7, two grooves 3 having an inverted trapezoidal cross section are provided so as to extend in the longitudinal direction. These grooves 3.3 have a bottom 3
A tip portion 8a of a screw 8 for fastening a joist is screwed into a and 3a. 2a12a is a left and right supporting surface portion of the upper surface, 2b
Is a central support surface portion located between both grooves 3 and 3.

Reference numeral 4.4 is a left and right side surface.
In this case, two ribs 5, 5 are formed inwardly in the upper and lower positions along the longitudinal direction.

6 is a receiving piece 10 provided on the upper part of the bundle 9.
(See Fig. 3)
The lower surface 6 is set to have a width smaller than that of the upper surface 2. The width of the lower surface 6 is set in consideration of the degree of reinforcement of the ribs 5 such that the rectangular steel pipe having the width of 2 as one side can obtain the strength corresponding to the strength required at the construction site. . For example, the width and height of the upper surface is about 88mm, and the depth is 2.4m on both sides.
When a rib of m was provided, the strength of the lower surface was set to about 58 mm, and a strength equal to that of a steel pull having a square cross section with a side of 88 mm and the same plate thickness was obtained. As a result, about 10% (?) Of material cost is saved.

FIG. 2 shows the construction condition of the floor base using the main pulling method.
Shown in The bottom of the large pull 1 is supported by a receiving piece 10 of a height adjustable bundle 9 having a turnbuckle 9a. As shown in FIG. 3, the receiving piece 10 has laterally inclined side plates 10 on both sides for holding the bottom of the large puller 1.
a, 10a. When screws are screwed into the lower surface 6 of the large pull 1 from a loose hole (not shown) provided on the lower surface of the bottom plate 10b of the receiving piece 10, the large pull 1 has its both side surfaces 4 and 4 inclined so that the side plates 10a and 10a of the receiving piece 10 are inclined. It is guided by the inclination and naturally fits in the center of the receiving piece 10.

A joist 7 is fixed to the upper surface 2 of the large pull 1. The joists 7 are groove bottoms 3 formed on the pulling upper surface 2.
By driving screws 8 into a and 3a, respectively, as shown in FIG.
a and the central support surface portion 2b are closely attached and fixed. Screw 8
Groove bottoms 3a, 3a and bottom joist bottom surface 7 of the hauling 1 into which
A gap 11 is formed between a and a. Therefore, when the wooden joist 7 is deformed, as shown in FIG. 5, the groove bottoms 3a, 3a are pulled through the screws 8 and bent upward, thereby absorbing the action force thereof and each of the large pulling upper surfaces 2. The contact state between the support surface portions 2a and 2b and the joist lower surface 7a is maintained.

Further, when connecting the large pulls 1 and 1'in the longitudinal direction, the large pulls 1 and 1'can be fitted in both grooves 3 and 3 of the upper face 2 of the large pull 1 as shown in FIG.
It is preferable to use the connecting fitting 12 shown in FIG. This metal fitting 12 is a body piece 12a, 12 that fits into the groove 3/3.
The front and rear ends of b are connected by connecting pieces 12c and 12d, and the front and rear connecting pieces 12c and 12d are bent along the cross-sectional shape of the upper surface of the pulling wire 1. Large pull 1,1 '
Since the joist 7 is located on the upper surface of the connecting portion of the module due to the relationship of the module, the joist 7 is similar to FIGS. 4 and 5, and the groove bottom 3a, that is, the metal fitting body pieces 12a, 12 in the groove 3.
A screw is driven toward b. For this reason, this large pull 1
By using the groove 3 on the upper surface 1 and using the fitting fitting within this, the splicing and joining can be performed relatively easily and reliably.

When a load is applied to the floor constructed in this way, the large pulling 1 has reinforcing ribs 5 on both side surfaces 4, so that even if it is made of thin steel material, it can be used as a conventional one. It does not swell in one direction, does not generate abnormal noise, and also prevents local buckling. In addition, when performing the splicing connection of the above-mentioned large pulls 1, 1 ', reinforcing ribs 5, 5'
It is also possible to hit the connecting plates 13 and 14 as shown in FIG. 8 to the side recesses caused by the above and hit them with screws 15 to join the two large pulls 1 and 1 ′.

[0021]

As described above, the outline of the present invention is as follows.
Since it has an inverted trapezoidal cross-section and has reinforcing ribs extending in the longitudinal direction on both sides, it is equivalent to these even if a thin steel plate material is used as compared to a rectangular steel pull with the same top width. Not only can it have strength and contribute to the reduction of material costs, but also it can be made lighter.

Further, since the bottom portion has a concave shape, there is an advantage that a bundle can be received easily.

In addition to the above-mentioned steel, when a groove for driving a joisting fastener is formed on the upper surface in the longitudinal direction,
A gap is less likely to be formed between the bottom surface of the joist made of wood or the like and the support surface portion of the upper surface of the pulling surface, and the noise of the floor can be prevented.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a large pull according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which floor foundation work is performed using the pulling wire of FIG.

FIG. 3 is a front view showing the relationship between a large pull and a bundle.

FIG. 4 is a cross-sectional view showing a state in which joists are fixed to the large pull.

5 is a cross-sectional view of the joist of FIG. 4 in a contracted state.

FIG. 6 is a perspective view showing an example of an upper surface connecting fitting for splicing and joining large pulls.

FIG. 7 is a perspective view showing a use state of the connecting fitting of FIG. 6;

FIG. 8 is a perspective view showing a state in which a large pull is spliced and joined on a side surface.

FIG. 9 is an explanatory view showing an example of a drawback of the conventional large pulling.

[Explanation of symbols]

 1 ... ・ Large pulling 2 ・ ・ ・ ・ ・ ・ Upper surface 2a, 2b ・ ・ ・ Supporting surface 3 ・ ・ ・ ・ Groove 3a ・ ・ ・ ・ Groove bottom 4 ・ ・ ・ ・・ ・ ・ Side 5 ・ ・ ・ ・ ・ Rib 6 ・ ・ ・ ・ ・ Bottom 7 ・ ・ ・ ・ Joist 9 ・ ・ ・ Bundle

Claims (5)

[Claims] 1. A reinforcing rib formed of a steel prismatic material, having a substantially trapezoidal cross-section with a width of an upper surface supporting a joist larger than a width of a lower surface supported by a bundle. Is formed along the longitudinal direction, which is a steel large pull. 2. The steel large pull according to claim 1, wherein a groove into which a fastener such as a screw for fixing the joist to the large pull is screwed is formed on the upper surface along the longitudinal direction. Steel pulling that is characterized by. 3. The steel large pull according to claim 2, wherein a plurality of the grooves are formed. 4. The steel pull according to claim 2 or 3, wherein the groove has an inverted trapezoidal cross section. 5. The steel large pull according to claim 1, wherein the reinforcing ribs are plural.