JP2003201704A - Joint filler for concrete paving - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To constitute a joint filler inserted into a joint groove formed between PC slabs so as not to form a partial recess on a concrete paving surface by the settlement of the joint filler into the joint groove even when the width of the joint groove is changed with the shrinkage and expansion of concrete. <P>SOLUTION: The joint filler 18 being inserted into the joint groove 14 between the PC slabs 12 and 12 and closing the opening of the joint groove 14 is constituted so as to embed the joint groove 14 as a whole up to a groove bottom by using hollow rubber blocks 16. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint material for concrete pavement which is inserted into a joint groove between adjacent concrete slabs.

[0002]

2. Description of the Related Art Conventionally, in concrete pavement, it has been practiced to fill an asphalt joint material in a joint groove between concrete slabs. However, this asphalt joint material has a problem that it cannot follow the large expansion and contraction of concrete.

For example, in an airport apron for loading and unloading airplane passengers and cargo, a large prestressed concrete slab (a steel plate embedded inside is pretensioned to prestress the concrete slab. However, in the case of such a large PC plate, the contraction of the concrete after construction and the amount of contraction / expansion in each season such as summer and winter are large, and the above-mentioned asphalt. This cannot be followed by the system joint material.

Therefore, it has been proposed that a joint material for concrete pavement is composed of a hollow rubber block having elasticity and is inserted in a joint groove between the concrete slab in a compressed state. (Patent Document 1 below).

[0005]

[Patent Document 1] Japanese Utility Model Laid-Open No. 5-16808

FIG. 8 shows a specific example thereof. In the figure, 200 is a roadbed, 202 is a PC version, and 204 is those PCs.
A joint groove formed between the plates 202 and 206 is a metal fitting mounted on the end surface of the PC plate 202.
Reference numeral 08 is a rubber block as a joint material having a hollow shape and having elasticity.

The holding metal fitting 206 and the rubber block 2
08 has a groove 210 and a ridge 212, respectively, and by fitting them, the rubber block 20
8 is held by the holding metal fitting 206 so as to close the opening of the joint groove 204.

Reference numeral 214 denotes a backup material inserted and arranged below the joint groove 204. The backup material 214 supports and backs up the rubber block 208 from the lower side. Here, the rubber block 208 is made of CR (chloroprene) rubber, and the backup material 214 is made of foamed polyethylene.

[0009]

The rubber block 208 as the joint material is constructed in a compressed state in the lateral direction, that is, in the groove width direction of the joint groove 204, as shown in FIGS. 8 (A) and 8 (I). Therefore, the shrinkage of the PC plate 202 causes the joint groove 2
When the groove width of No. 04 widens, it widens itself in the same direction and follows the change in the groove width.

However, in the case of this rubber block 208, when the shape changes in the left-right direction, the shape shown in FIG.
As shown in (A) and (II), the height changes, and a gap is created between the rubber block 208 and the backup material 214. Therefore, the backup material 214
8B falls by some force as shown in FIG. 8B, and the support of the rubber block 208 is lost, whereby the rubber block 208 sinks into the joint groove 204 due to a downward load or the like. In other words, the concrete pavement surface becomes partially concave at the joint groove portion 204, which causes a problem that wheels of a carrier car carrying a load or wheels for a trap are dropped therein.

[0011]

The jointing material for concrete pavement of the present invention has been devised to solve the above problems. Thus, claim 1 is a joint material which is inserted into a joint groove between adjacent concrete slabs to close the joint groove, and the joint groove is entirely formed by using a hollow rubber block up to the groove bottom. It is characterized in that it is configured to be embedded in.

According to a second aspect of the present invention, in the first aspect, the concrete slab is a prestressed concrete slab.

[0013]

As described above, according to the present invention, the joint material for concrete pavement is constructed so that the joint groove is entirely filled up to the groove bottom by using the hollow rubber block. By doing so, it is possible to eliminate the need for the conventionally used backup material, and it is possible to avoid the inconvenience that the joint material sinks due to the backup material falling.

INDUSTRIAL APPLICABILITY The present invention can be suitably applied as a joint material for a concrete pavement surface using a PC plate (claim 2).

[0015]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 shows the structure of the main part of the concrete pavement part of the airport apron. In the figure, 10 is a roadbed, 12 is a PC plate (prestressed concrete plate) laid on the roadbed 10 next to each other, 14 is a joint groove formed between them. A joint material 18 fills the joint groove 14 as a whole, and is composed of a plurality of rubber blocks 16.

In this example, a total of nine rubber blocks 16 having the same shape are used, and these are arranged in three rows in the groove width direction and three rows in the vertical direction.

Incidentally, FIG. 1A shows a state in which the joint width 14 is the set maximum width (W1 = 120 mm in this case), and FIG.
(B) shows the state when the minimum width is set (W2 = 80 mm in this case) (groove depth is 250 mm). The rubber block 16 is in a state of being elastically compressed in the left-right direction, that is, the groove width direction even when the set maximum width in FIG.

FIG. 2 shows the molded shape of the rubber block 16, that is, the shape in a free state after molding. As shown in the figure, the rubber block 16 includes a pair of vertical vertical side walls 19, an upper wall 20 connecting the upper ends of the side walls 19 in the left-right direction, and lower ends of the side walls 19. And a lower wall portion 22 that connects the two in the left-right direction, and has a hollow long tubular shape as a whole (4 m in this example). In the figure, reference numeral 24 represents a hollow portion inside thereof.

In this example, the upper wall portion 20 has a bent shape which is generally convex downward. More specifically, the upper wall portion 20 has a pair of obliquely descending portions 26 that extend downward from each side wall portion 19 while gently curving toward the center in the width direction, and they are connected to each other at the center in the width direction. An inflection portion 30 having a changing bend is formed.

Similarly, the lower wall portion 22 also has a pair of obliquely rising portions 28 extending from each lower end of each side wall portion 19 toward the center in the width direction while curving obliquely upward, and these are connected at the center in the width direction. An inflection portion 30 having a changing bend is formed there. In this example, the rubber block 16 has a width d ₀ of 45 mm and a height h ₀ of 83 mm.

As shown in FIG. 2 (A), this rubber
In the block 16, the upper wall portion 20 and the lower wall portion 22 face downward, respectively.
Or has a bent shape that is convex upward
As shown in (a) and (c),
Height h ₀Is constant. This example
In the rubber block 16, an extruded product is used.
Also, CR (chloroprene) rubber is used as the rubber material.
I have been.

The rubber block 16 is filled inside the joint groove 14 in a state where the joint groove 14 is elastically compressed and deformed in the left-right direction (groove width direction) in the state of the set maximum width shown in FIG. 1 (A), Thus, the width d of each rubber block 16 at this time
₁ is 40 mm in this example. That is, with respect to the shape in the free state after molding, it is filled in the joint groove 14 in a state of being elastically compressed and deformed by 5 mm in the left-right direction.

As described above, in this embodiment, the joint material 1 is filled with a large number of rubber blocks 16 inside the joint groove 14 so as to completely fill the joint groove 14 up to the groove bottom.
In addition, each rubber block 16
Does not change its height even if it is deformed in the width direction, so P
Even when the width of the joint groove 12 changes due to the expansion and contraction of the C plate 12, the height of the joint material 18 does not change, and therefore the width of the joint groove 14 is narrowed, whereby the joint material 18
Does not cause the inconvenience of protruding above the concrete pavement surface.

Further, unlike the conventional joint material as shown in FIG. 8, the backup material collapses due to the widening of the joint groove 14, which causes the joint material 18 to sink downward to form a recess therein. There is no inconvenience that the wheels of the carrier car or the wheels for the traps fall into them.

When the rubber block 16 is loaded into the joint groove 14 to form the joint material 18 that fills the joint groove 14, three rubber blocks 16 are provided as shown in FIG.
Can be arranged side by side in the left-right direction and adhered by an adhesive or the like to form a unit 32 in advance, which can be pushed into the joint groove 14 and sequentially stacked on the upper side. In this way, the joint groove 14 can be easily formed by the plurality of rubber blocks 16.
A joint material 18 that fills the inside can be configured. At this time, it is convenient to push the unit 32 into the joint groove 14 using a jig as shown in FIGS. 4 and 5.

Of these, the example of FIG. 4 is a trumpet-shaped upper portion 34.
In the example of using the jig 38 having the straight lower portion 36, the unit 32 can be easily pushed and inserted into the joint groove 14 by using the jig 38.

On the other hand, in the example shown in FIG. 5, a pair of guide plates 39 standing upright from the upper surface of the PC plate 12 and a bolt 40 for fastening them left and right to hold the guide plates 39 and 39 at a constant interval. This is an example of using a jig 42 having a. In this case, the rubber block 16 is easily inserted into the joint groove 14 by pushing the unit 32 downward into the joint groove 14 while being guided by the guide plate 39 through the space between the bolts 40 which are separated in the front-rear direction. Can be loaded into.

In this example, since the rubber block 16 has a vertically symmetrical shape, the rubber block 16 is formed into the joint groove 14.
When inserting into, it does not need to be selected in the vertical direction, and construction is simple.

Further, in this example, each rubber block 16 is
Since it is small, the manufacturing cost can be reduced, and the cost of the joint material 18 itself including the plurality of rubber blocks 16 can be reduced.

Further, in this example, the conventionally used backup material is unnecessary, and therefore, the disadvantage that the joint material 18 sinks due to the fall of the backup material does not occur.

Further, in this example, since the rubber block 16 is packed into the joint groove 14 as the unit 32, the joint material 18 can be easily installed, and the rubber block 16 can be aligned vertically and horizontally in the joint groove 14. You can

In the above example, the joint material 18 is formed by using a large number of rubber blocks 16 having the same shape and the same size. However, in the present invention, a spacer material and a rubber having different shapes different from this are used. It is also possible to form the joint material 18 by combining with the block 16. FIG. 6 shows an example thereof, and in this example, the joint material 18 is constituted by using the rubber block 16 and the rubber sheet 44 as a spacer material.

By doing so, the joint material 18 can be satisfactorily filled inside the joint groove 14, and by using such a rubber sheet 44, the width of the joint material 18 can be increased. The width can be an appropriate width corresponding to the width of.

FIG. 7 shows another embodiment of the rubber block 16. Rubber block 1 of this example as shown
6 has a form in which the pair of side wall portions 19 are connected left and right by a connecting portion 46 at an upper and lower intermediate position. Here, the connecting portion 46 has the same shape as the upper wall portion 20, that is, the entire connecting portion 46 has a bent shape that is convex downward. In this example, the connecting portion 46 is composed of the pair of sloped portions 26 and the inflection portion 30,
The connecting portion 46 may have the same shape as the lower wall portion 22, that is, a shape including a pair of sloped portions 28 and an inflection portion 30.

In the case of the rubber block 16 which does not have such a connecting portion 46, the side wall portion 19 is deformed due to the rubber settling after the molding, whereby the height of the rubber block 16 is changed (decreased by Δh ₀ minutes). By providing such a connecting portion 46, it is possible to prevent the rubber from sagging, that is, a change in the height of the rubber block 16 due to the deformation of the side wall portion 19. That is, due to the presence of the connecting portion 46, the height of the rubber block 16 can be kept constant even after molding.

In addition, since the connecting portion 46 has a bent shape which forms a downward (or upward) convex, it has the advantage that it can be easily deformed even when the rubber block 16 itself is deformed in the lateral direction, that is, the groove width direction. Have.

The embodiment of the present invention has been described in detail above, but this is merely an example, and the present invention can be applied to the case of laying a normal concrete slab other than the PC slab to form a concrete paved surface. The present invention can be configured in a form in which various modifications are made without departing from the spirit of the present invention.

[Brief description of drawings]

FIG. 1 is a view showing a joint material in an installed state according to an embodiment of the present invention.

FIG. 2 is a view showing a shape of a single rubber block in the joint material of FIG.

FIG. 3 is a diagram showing an example of a method of applying the joint material of FIG.

FIG. 4 is a diagram showing an example different from that of FIG. 3 of the method of applying the joint material of FIG. 1.

5 is a diagram showing an example different from FIGS. 3 and 4 of the method of applying the joint material of FIG.

FIG. 6 is a view showing a joint material which is another embodiment of the present invention.

FIG. 7 is a diagram showing a rubber block in a joint material according to still another embodiment of the present invention.

FIG. 8 is an explanatory view showing a conventional rubber block of a joint material in a construction state together with its defects.

[Explanation of symbols]

12 PC version 14 joint groove 16 rubber block 18 joint materials

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takayuki Tanaka             Tokai Rubber Works, Higashi 3-chome, Komaki City, Aichi Prefecture             Business (72) Inventor Ken Miyauchi             4th, 3rd, 9th, Kitankita, Chiyoda-ku, Tokyo             Ceremony Company PS Mitsubishi Tokyo Civil Engineering Branch F-term (reference) 2D051 AC04 AF03 AG03 FA04

Claims (2)

[Claims] 1. A joint material which is inserted into a joint groove between adjacent concrete slabs to close the joint groove, and the joint groove is entirely filled up to the groove bottom by using a hollow rubber block. A jointing material for concrete pavement, which is characterized in that 2. The joint material for concrete pavement according to claim 1, wherein the concrete slab is a prestressed concrete slab.