JP5461296B2 - Slab mat and concrete slab structure including the same - Google Patents

Description

  The present invention is provided on the lower surface of a slab of a concrete slab used on the upper part of a road bed, such as a track, a road, and a bridge, and generates vibrations generated by a vehicle such as a railway traveling on the slab. The present invention relates to a vibration-proof slab mat that prevents transmission to a roadbed as much as possible, and a technology of a concrete slab structure including the slab mat.

  In order to reduce the maintenance of roadbeds and roadbeds, many techniques have been put into practical use in which concrete slabs are arranged side by side on trackways, roads, bridges, and other roadbeds and roadbeds. In such a field, anti-vibration measures for coping with the increase in vibration associated with higher speeds of vehicles and the like are an important issue, and various methods have been developed.

  For example, in the field of anti-vibration slabs for tracks, on the lower surface of a slab of 160 to 220 mm in thickness, 2000 to 2340 mm in width and about 5000 mm in length, or a concrete sleeper-like concrete slab (about 180 mm × 460 mm × 5200 mm), A technique has been developed in which an anti-vibration slab mat, which is formed into a flat plate having an uneven surface by an elastic body such as rubber, is attached by adhesion.

  However, in the method of adhering the slab mat to the bottom surface of the slab of the concrete slab after hardening, it takes a lot of man-hours to remove the latency of the concrete surface, and the working environment is bad due to the generation of dust accompanying the removal work. There is a problem that it is easily influenced by temperature and humidity when bonding.

  Therefore, for example, as shown in Patent Document 1, a large number of thread bodies protruding or bent are provided on the side where the slab mat is attached, the slab mat is placed on the cast concrete, and the protrusions are placed on the ready-mixed concrete. A technique has been developed in which the slab mat is fixed to the lower surface of the concrete slab through protrusions or the like by being embedded in the core and curing the ready-mixed concrete in this state.

JP 2002-322601 A

  However, in the method in which the protrusions provided on the slab mat are embedded and fixed in the concrete slab, the slab mat placed on the ready-mixed concrete before curing is buried more than necessary in the ready-mixed concrete. A part of the concrete slab floats, making it difficult to accurately position the slab mat at a predetermined position on the concrete slab. Therefore, many man-hours are required for the positioning work of the slab mat. In addition, when a failure occurs in positioning of the slab mat, the concrete slab itself to which the slab mat is fixed becomes a defective product, so that economic loss is great. Furthermore, since the surface of the slab mat is provided with unevenness for vibration absorption, if the pressure vibration state continues for a long time after construction, the unevenness is deformed, and creep (compression permanent set, sag) is generated on the slab mat. May occur.

On the other hand, when slab mats are stored, transported, etc., in order to reduce the arrangement space, it is common to arrange a large number of slab mats. However, the slab mat is formed into a flat plate shape (mat area Scm ² / mat thickness Tcm> 200) by an elastic body such as rubber, and the surface (mounting surface) is provided with a vibration absorbing unevenness to the concrete slab. Since the fixing protrusion is provided, there is a risk of deformation (wavy, bent) in storage, transportation, etc. until it is placed on the ready-mixed concrete. Thus, when deformation (crawl) occurs in transportation or the like, a large number of man-hours are required to correct the deformation and flatten the slab mat. Also, if the deformed slab mat is placed on the ready-mixed concrete as it is and the concrete is hardened, the slab mat will be fixed to the concrete slab with the deformation, and the concrete slab itself to which the slab mat is fixed is also defective. Therefore, the economic loss is large.

  Also, if a concrete slab structure with a slab mat whose flatness cannot be ensured due to poor positioning or deformation is installed on the roadbed, etc., the slab mat will hit the roadbed, etc., and the concrete slab will not be able to obtain a predetermined spring constant. The durability of the structure will be reduced.

  An object of the present invention is to facilitate the positioning operation of the slab mat on the ready-mixed concrete and to reduce the creep of the slab mat during use after construction.

  Another object of the present invention is to prevent deformation of the slab mat during storage, transportation and the like.

  The slab mat of the present invention is a slab mat provided on the lower surface of a slab of a concrete slab used on the road bed or the upper part of the road bed, and the mounting of the slab mat to the lower surface of the slab is on the side of the concrete slab. Provided with a protrusion to be embedded, and provided with a concave portion for an air chamber that opens only on the side of the mounting, and the mounting of the slab mat does not reach a surface other than the side of the mounting, on the side of the mounting of the slab mat. It is characterized by that.

  In the slab mat of the present invention, an accommodation recess of a size corresponding to a position where the projection is provided and including the projection is provided on the back surface of the slab mat opposite to the mounting side surface. It is characterized by.

  The concrete slab structure of the present invention is a slab mat provided on a lower surface of a slab of a concrete slab used for an upper part of a road bed or a road bed, and the concrete slab is attached to a lower surface of the slab mat on the lower surface. A recess for an air chamber that is provided with a protrusion embedded in the slab mat, and that the attachment of the slab mat opens to the side of the slab mat, and the attachment of the slab mat does not reach a surface other than the side of the slab mat. The slab mat is characterized by being formed by being fixed to a concrete slab.

  The concrete slab structure of the present invention is provided with an accommodation recess on the back surface of the slab mat opposite to the mounting side surface corresponding to the position where the protrusion is provided and having a size capable of containing the protrusion. It is characterized by that.

  According to the present invention, when the slab mat is placed on the ready-mixed concrete placed for forming the concrete slab, the opening of the recess for the air chamber provided in the slab mat is closed by the ready-mixed concrete. Since the air accumulated inside the recess acts as a float and the slab mat sinks into the ready-mixed concrete automatically, it can be placed in place on the ready-cast concrete without using a positioning jig. The slab mat can be positioned easily and uniformly. In addition, since the slab mat can be uniformly fixed to the concrete slab, variation of the spring constant in the vertical direction of the slab mat with respect to a predetermined value is reduced, and the durability of the concrete slab structure provided with the slab mat is improved. Can be increased. Further, since the air in the air chamber recess is sealed by the concrete slab and functions as an air spring, the load applied to the concrete slab structure is supported by the function as the air spring in the air chamber recess. Matt creep (compression set, settling) can be reduced.

  According to the present invention, even if a large number of slab mats provided with protrusions on the mounting side are stacked for storage, transportation, etc., the stacked protrusions on one slab mat are placed on the other slab mat. By including the mat in the mat recess, a large number of slab mats can be stacked in a flat plate shape, and deformation of the slab mat can be prevented. As a result, the slab mat can be uniformly fixed to the concrete slab, so that the variation of the spring constant in the vertical direction of the slab mat with respect to a predetermined value is reduced, and the durability of the concrete slab structure provided with this slab mat Can be increased.

(A) is a plan view of a slab mat according to an embodiment of the present invention, (B) is a cross-sectional view taken along the line AA in FIG. (A), and (C) is an embodiment of the present invention. An enlarged sectional view of a gibber part and a crevice of a concrete slab structure, (D) is a sectional view of a concrete slab structure shown in the figure (C). It is sectional drawing which shows the state which has arranged many slab mats shown in FIG. (A)-(E) is explanatory drawing which shows the manufacturing process of the concrete slab structure shown in FIG. 1, respectively. (A) is a top view which shows the slab mat which the groove | channel provided in the attachment side as an example also opened also in the outer peripheral parts other than the attachment side, (B) is A in FIG. A cross-sectional view taken along line -A, (C) is an enlarged cross-sectional view of the dowel portion in FIG. It is sectional drawing which shows the state which the slab mat shown as a comparative example in FIG. 3 deform | transformed on the cast-in concrete.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, a slab mat 1 of the present invention is provided on a slab lower surface 2a of a concrete slab 2 used by being placed on a road bed such as a track, a road, a bridge, or the upper part of a road bed, such as rubber. The elastic body is molded into a flat plate shape.

  One surface in the thickness direction of the slab mat 1 is a side surface 1a attached to the slab lower surface 2a of the concrete slab 2, and a groove 3 as a recess for the air chamber is provided on the side surface 1a. It has been. This groove 3 has a function as a vibration absorber for effectively absorbing vibration by making the slab mat mounting surface 1a uneven, thereby allowing the slab mat 1 to have elasticity with a predetermined spring constant. Yes.

  The groove 3 extends along the longitudinal direction of the side surface 1a of the slab mat 1 and is connected to six groove portions that are arranged at equal intervals in the lateral direction and both longitudinal ends of these groove portions. It consists of a total of 8 groove portions of 2 groove portions. The groove 3 is opened only on the side 1a of the slab mat 1 and does not reach the outer periphery 1b of the slab mat 1 or the back 1c opposite to the side 1a.

A plurality of protrusions 4 are provided on the surface portion of the slab mat 1 where the groove 3 of the side surface 1a is not provided. These protrusions 4 are provided so that the attachment stands upward with respect to the flange surface 1a. The density of the slab mat 1 on the side surface 1a of the protrusions 4 may be set on the side surface 1a so that the density of the slab mat 1 is 50 to 250 pieces / m ² . The manner in which the protrusions 4 stand is not limited to the direction perpendicular to the mounting surface 1a. In the case shown in the drawing, a screw 4a is used as the protrusion 4, and the head 4b of the screw is fixed by bonding or the like in a state where the attachment of the slab mat 1 is embedded in the side surface 1a.

  The protrusion 4 is not limited to the screw 4a in which the head 4b is embedded in the mounting flange surface 1a, but a configuration in which the tip of the screw 4a is screwed into the mounting flange surface 1a and fixed, a nail or a tucker stable, etc. Other configurations, such as a configuration using the slab mat or a configuration in which a rubber protrusion is provided integrally with the slab mat 1, may be adopted.

  As shown in FIG. 1 (C), the back surface 1c opposite to the side 1a of the slab mat 1 is mounted on the back surface 1c corresponding to the position where the protrusion 4 is provided, that is, directly below the protrusion 4. An accommodation recess 5 (hereinafter referred to as a recess 5) is provided. These recesses 5 are provided in the same number as the projections 4 corresponding to the plurality of projections 4 provided on the mounting surface 1a. These recesses 5 are indented to open on the back surface 1 c of the slab mat 1, and the attachment of the protrusions 4 is deeper than the protrusion height from the side surface 1 a and has an inner diameter larger than the outer diameter of the protrusions 4. Have. That is, the concave portion 5 is formed to have a size capable of including the protrusion 4.

  By providing the recesses 5 on the back surface 1c of the slab mat 1, as shown in FIG. 2, when a large number of slab mats 1 are stacked in storage, transportation, etc., each protrusion 4 is accommodated in the corresponding recess 5. The protrusion 4 does not hit the mounting surface 1a. As a result, even if a large number of slab mats 1 are stacked, the slab mats 1 are not supported by the protrusions 4 and are stacked with their flat portions in close contact with each other. Therefore, even when a large number of slab mats 1 are stacked in storage, transportation, etc., the slab mat 1 can be prevented from being deformed by the protrusions 4, and the flatness of the slab mat 1 can be maintained. .

  3 (A) to 3 (E) are explanatory views showing manufacturing steps of the concrete slab structure shown in FIG.

  The slab mat 1 is fixed to the slab lower surface 2a of the concrete slab 2 through the protrusions 4 provided on the mounting surface 1a without using an adhesive. Then, the slab mat 1 is fixed to the concrete slab 2 through the protrusions 4, whereby the concrete slab structure 6 is manufactured. A manufacturing procedure of the concrete slab structure 6 using the slab mat 1 will be described with reference to FIG.

  First, as shown in FIG. 3A, a predetermined amount of ready-mixed concrete 8 is placed inside the slab forming mold 7. In a state where a predetermined amount of ready-mixed concrete 8 is placed, as shown in FIG. 3 (B), the concrete placing upper surface becomes an open surface. This placement upper surface corresponds to the slab lower surface 2a on which the slab mat 1 is provided.

  Before the ready-mixed concrete 8 is hardened in a state in which the concrete casting surface placed inside the slab forming mold 7 is flattened, as shown in FIG. The illustrated slab mat 1 is temporarily placed on the ready-mixed concrete 8 with the mounting face 1a provided with the projections 4 facing the placing surface. Then, in this state, the slab forming mold 7 is vibrated to release the air inside the ready-mixed concrete 8 (air release), and the protrusion 4 of the slab mat 1 is gradually buried in the ready-made concrete 8. .

  As shown in FIG. 3 (D), when the projection 4 of the slab mat 1 is completely buried in the ready-mixed concrete 8 and its mounting surface 1a is in contact with the surface of the ready-mixed concrete 8, As can be seen from D), the opening of the groove 3 facing the flange surface 1 a is tightly closed by the ready-mixed concrete 8 and the air is sealed inside the groove 3. When the air is sealed inside the groove 3, the air acts as a float, and the slab mat 1 is automatically stopped from sinking into the ready-mixed concrete 8 by the buoyancy. Thereby, the slab mat 1 is positioned at a predetermined position on the surface of the ready-mixed concrete 8 without using any positioning jig.

  When the slab mat 1 is positioned at a predetermined position on the ready-mixed concrete 8, the ready-made concrete 8 may be cured in that state. When the ready-mixed concrete 8 is hardened, the concrete portion becomes the concrete slab 2. In addition, the protrusion 4 embedded in the ready-mixed concrete 8 is fixed to the hardened concrete slab 2, whereby the slab mat 1 is fixed to the slab lower surface 2 a of the concrete slab 2 through the protrusion 4.

  When the concrete slab 2 is cured to a predetermined hardness, the slab mat 1 and the concrete slab 2 are provided on the slab mat 1 as shown in FIG. The concrete slab structure 6 having a structure fixed through the protrusions 4 is completed.

  FIG. 4 (A) is a plan view showing a slab mat in which a groove provided on the mounting side is opened as a comparative example in an outer peripheral portion other than the mounting side, and FIG. 4 (B) is the same figure (A). Sectional drawing in alignment with the AA in FIG. 1, (C) is an expanded sectional view of the dowel part in the same figure (A). FIG. 5 is a cross-sectional view showing a state in which the slab mat shown as a comparative example in FIG. 3 is deformed on the cast concrete.

  In the slab mat 11 shown as a comparative example in FIG. 4, the groove 13 and the protrusion 14 are provided on the mounting surface 11 a of the slab mat 11, but the recess 11 containing the protrusion 14 is not provided on the back surface 11 c. For this reason, when a large number of such slab mats 11 are stacked in storage, transportation, etc., the slab mats 11 are deformed by the protrusions 14. Further, in the slab mat 11 of the comparative example, the groove 13 provided on the flange surface 11a is also opened on the outer periphery 11b. When such a slab mat 11 is temporarily placed on the ready-mixed concrete 8 placed on the slab forming mold 7 and vibration is applied to the slab forming mold 7, the air inside the groove 13 is transferred to the outer periphery 11b. The portion escapes to the outside and does not accumulate in the groove 13, and the groove 13 does not act as a float. Therefore, the slab mat 11 of the comparative example is in a deformed state without being uniformly positioned at a predetermined position on the ready-mixed concrete 8. Then, when the ready-mixed concrete 8 is cured while the slab mat 11 is deformed as described above, the slab mat 11 is fixed to the concrete slab 12 while being deformed as shown in FIG. The concrete slab structure 16 will be manufactured.

  In contrast to such a comparative example, in the slab mat 1 of the present invention, the groove 3 provided on the side 1a of the slab mat is opened only on the side 1a of the mounting, and on the ready-mixed concrete 8 on which the slab mat 1 is placed. Since the opening of the groove 3 is closed by the ready-mixed concrete 8 when placed on the ready-made concrete 8, the slab mat 1 is placed on the ready-made concrete 8 by the buoyancy of the air accumulated in the groove 3 without using a positioning jig. It is possible to uniformly position the slab mat 1 while keeping the entire flatness of the slab mat 1 at a predetermined position.

  When the slab mat 1 is fixed to the concrete slab 2, the opening of the groove 3 is closed by the concrete slab 2, and the air sealed inside the groove 3 functions as an air spring. Thereby, even if a vehicle etc. drive | works on the concrete slab structure 6 after construction arrange | positioned on a roadbed etc. and a big load is added to this concrete slab structure 6, a part of the load is groove | channel 3 It is possible to reduce the creep (compression permanent set, settling) of the slab mat 1 by supporting it by the function as an air spring that generates air that is sealed.

  Furthermore, in order to allow the entire groove 3 provided in the slab mat 1 to act as a uniform float, it is necessary to increase the flatness of the slab mat 1 itself, but in the slab mat 1 of the present invention, the slab mat 1 is attached. Since the fixing surface 4 is provided on the back surface 1a and the recessed portion 5 in which the protrusion 4 can be included is provided at a position corresponding to the protrusion 4 on the back surface 1c of the slab mat 1, a large number of sheets can be stored and transported. Even if the slab mats 1 are stacked, the deformation can be prevented and the flatness of the slab mat 1 can be maintained.

  It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, in the above-described embodiment, the groove 3 provided with eight groove portions is provided on the attachment surface 1a of the slab mat 1, but not limited to this, the number and arrangement of the grooves 3 are arbitrary. Can be set.

  In addition, the air chamber recess provided in the slab mat 1 is not limited to the groove 3, and may be, for example, a mechro hole as long as the slab mat 1 is formed in a recessed shape that opens only on the side 1 a. .

1 slab mat 1a mounting side 1b outer periphery 1c back 2 concrete slab 2a slab bottom 3 groove (recess for air chamber)
4 Protrusion 4a Screw 4b Head 5 Receiving recess 6 Concrete slab structure 7 Form for slab formation 8 Ready-mixed concrete 11 Slab mat 11a Mounting face 11b Outer periphery 11c Back 12 Concrete slab 13 Groove 14 Protrusion 16 Concrete slab structure

Claims (3)

A slab mat provided on the bottom surface of a concrete slab used on the road bed or the upper part of the road bed,
Attaching the slab mat to the lower surface of the slab, on the side of the slab, and providing a protrusion embedded in the concrete slab,
The slab mat is characterized in that the mounting surface of the slab mat is provided with a recess for the air chamber that opens only on the side of the slab mat and does not reach the surface other than the mounting surface. .   2. The slab mat according to claim 1, wherein an accommodation recess of a size corresponding to a position where the projection is provided and capable of containing the projection is provided on the back surface of the slab mat opposite to the mounting side surface. A slab mat characterized by that.   A concrete slab structure formed by fixing the slab mat according to claim 1 to a concrete slab.

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