JPH064964B2 - Joint structure of connected block structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention relates to a connected block structure in which a plurality of precast concrete blocks are stacked and these blocks are integrated by a PC steel material arranged along the connecting direction of the blocks. It is related to the joint structure of.

"Prior Art" As this type of connection block structure, there is a piled connection block structure applied to an offshore structure such as a breakwater. This is a structure as shown in FIGS. 9 and 10, for example. That is, a plurality of piles 2 driven into the seabed 1 are used as a foundation, and a precast concrete block (hereinafter referred to as a block) 4 having holes 3 and flat upper and lower surfaces allows the piles 2 to be loosely inserted into the holes 3. In this state, the piles 2 are bridged and piled up in multiple layers in a grid pattern.

The pile 2 and the block 4 are suspended from the vicinity of the upper end of the pile 2 by a PC steel material 7 to grip the pile 2 and hold the block 4 from below.
And the concrete mortar 6 filled between the holes 3 of the concrete block 4 and the piles 2, and each of the blocks 4 is suspended from the PC steel material 7 along the piles 2. It is integrated with the prestress introduced by the tension of.

By the way, conventionally, for example, the following three means are applied as joints between blocks in such a connected block structure.

The first is a method of simply stacking blocks without applying joint material.

The second is a method of interposing blocks such as a rubber sheet and a urethane mat.

The third method is to provide joints made of an underwater curable resin adhesive or the like.

"Problems to be Solved by the Invention" However, in the above-described three conventional techniques, the following problems to be solved remain, respectively.

In the method of stacking blocks without joint material between the joint surfaces of the blocks, as shown in FIG.
Due to the unevenness of the joint surface caused by the manufacturing error of the block 4, the protrusions 4a come into contact with each other, and when a large force acts such as when prestress is introduced, stress concentration occurs in the protrusion 4a. , Tensile stress parallel to the joint surface (arrow X in the figure
There is a problem that a crack is generated due to the stress in the direction. Moreover, when a joint material is not used between the joint surfaces of the blocks in this way, there is a problem that seawater or the like enters through the gaps in the joint surfaces, the PC steel material 7 corrodes, or the filling mortar 6 leaks. To be.

The method of laying a rubber sheet, urethane mat, etc. can be expected to prevent leakage of the filled mortar 6 and prevent water leakage, but P
When the C steel material 7 is under tension, as shown in FIG. 12, it is difficult to prevent stress concentration due to excessive deformation of the rubber sheet, urethane mat 8 or the like or partial cutting. Also, there is a problem that the material is likely to change and deteriorate.

With a joint material such as an underwater curable resin adhesive, the curing begins in a relatively short time, so the pot life is short and it is difficult to use it especially at sea construction that is affected by wind and waves. There is a point. Moreover, once the joint material is hardened before joining, it is difficult to peel it off, the joining cannot be redone, and it is difficult to obtain a uniform thickness, and the cost is expensive. There is a problem.

In addition, there is also a means of simply applying concrete or mortar between the joint surfaces of the blocks, but in the case of such a method,
The hard-kneaded product is difficult to fill the entire joint surface, and conversely, the soft-cured product has a problem that concrete or mortar leaks out from the joint portion at the time of joining. Especially when there is a block joint in water, there is a problem that mortar and concrete are washed away by waves and tidal currents.

The present invention has been proposed in view of the above circumstances, its purpose is that the workability is good, and it is possible to introduce prestress without adversely affecting the stacked precast concrete blocks such as cracks. The purpose of the present invention is to provide a joint structure of a connected block structure capable of reliably achieving water stoppage at a joint between blocks.

[Means for Solving the Problems] Therefore, the first invention is a connected block structure in which a plurality of precast concrete blocks are stacked and these blocks are integrated by tension of a PC steel material arranged along the connecting direction of the blocks. The joint structure is composed of a bag body having a size interposed between the joint surfaces of the blocks and covering the joint surface, and a joint material filled inside the bag body.

A second aspect of the present invention is a joint structure of a connecting block structure in which a plurality of precast concrete blocks formed in a tubular shape are stacked, and these blocks are integrated by a PC steel material penetrating each block. A bag body having a size interposed between the joint surfaces to cover the joint surface, and a joint material filled inside the bag body, and the bag body is provided along the outer periphery of the block. The outer bag and the inner bag provided along the inner circumference of the block.

[Operation] According to the present invention, since the bag body filled with the joint material is set on the installed block, and the joint portion can be constructed by the joining means for stacking the block thereon, the workability is improved. Moreover, since the joint material is pre-filled in the bag body, the joint material does not leak during construction or the like.

Further, when the blocks are stacked, the bag body filled with the joint material absorbs the unevenness of the joint surface between the blocks in a flexible manner corresponding to the shape of the joint surface of the block, so that the gap between the uneven surfaces is filled, The joint surface becomes uniform, and P
It is possible to prevent stress concentration when the C steel material is strained.

[Examples] Examples of the present invention will be described below with reference to the drawings. It should be noted that the present embodiment is applied to a pile driving connection block structure which is one of the connection block structures.

1 to 5 show an embodiment of the first invention, and in these drawings, reference numeral 10 is a pile driven into the seabed 1, and a lower portion of the pile 10 is formed in a cylindrical shape. A wedge fastening device 12 for holding the precast concrete block 11 from below is provided. In the illustrated example, the fastening device 12 includes a PC steel material 13 suspended along the pile 10, an annular member 12a fixed to the tip of the PC steel material 13 in a state where the pile 10 is loosely inserted, and a head portion. The annular member 1 has a shape in which a cut cone is divided into a plurality of pieces (three divisions) in the axial direction and holds the pile 10.
A pile gripping member 12b placed in a state where the PC steel material 13 is inserted on each of the 2a, and the pile gripping member 12b is taper-fitted from above to grip the pile 10 and hold the block 11 from below. Annular holding member 12c
It consists of and.

The annular blocks 11, 11, ... Are stacked on the upper surface of the holding member 12c, and the joints that form the main part of the present invention are joined to the joint surfaces of the blocks 11, 11 ,. A bag body 17 filled with the material 16 is interposed.

First, the bag body 17 for filling the joint material 16 will be described. The bag body 17 is formed into a flat bag shape by, for example, a strong non-woven fabric so as to match the shape of the joint surface of the block 11 (a ring shape in the illustrated example). The bag 17 is provided with an injection port (not shown) for filling the joint material 16 inside the bag 17.
It goes without saying that the injection port is hermetically sealed after filling the joint material into the bag body 17 so that the joint material 16 does not leak outside. The bag 17 may be a ring-shaped fabric foam or the like.

On the other hand, examples of the joint material 16 include, but are not limited to, a no-breathing type mortar having a hardening strength equal to or higher than that of a concrete block and sufficient adhesion can be obtained without causing a breathing phenomenon.

Note that reference numeral 20 in the drawing denotes a filling mortar filled between the holes of the stacked blocks 11 and the pile 10.

Next, the case of actually providing the joint structure of the connecting block structure configured as described above at the site will be described. First, the pile 10 is driven into the seabed 1, and the wedge fastening device 12 is set at the bottom of the pile 10. Then, the bag body 17 filled with mortar is set on the joint surface of the holding member 12c of the fastening device 12.

The bag body 17 is formed in advance in a factory or the like according to the shape of the block 11, and the joint material 16 such as mortar filled in the bag body 17 is kneaded on site and then the bag body 17 is formed.
It is what is injected into.

Next, the bag body 17 filled with the joint material 16 is set on the upper joint surface of the block 11, and then the block 11 is suspended and stacked on the holding member 12c.

In addition, when there is time before the installation of the block 11, the bag body 17 is hung up and installed without being set, and before the next block 11 is piled up, an underwater worker (diver)
The bag body 17 filled with the joint material 16 may be set on the joint surface in water.

And the above-mentioned process (block installation, bag 1
7 sets) are repeated to stack the blocks 11 and set the blocks 11 in a predetermined shape and size.

At the time of the construction, as shown in FIG. 4, for example, even if the joint surfaces of the blocks 11 to be stacked are inclined, the joint material 16 in the bag body 17 is in the bag body 1 if it is not cured yet.
Since it is movable within 7, the block 11 to be overlaid can be installed horizontally if the bag 17 has some margin beforehand.

If the block 11 is set in this way, after hardening and curing the mortar in the bag body 17, after the joint material 16 develops a predetermined strength, the PC steel material 13 is tensioned by a jack to introduce prestress, The whole block 11 is integrated. Then, when the inner space surrounded by the pile 10 and the block 11 is filled with the filling mortar 20,
It will be in the constructed state as shown in FIG.

Now, in the case where the joint structure in the connection block structure has such a configuration, first, the bag body 17 filled with the joint material 16 is set on the installation block 11, and the block 1
Since the joint portion can be constructed by the joining means for stacking 1, the workability can be improved, and the construction period can be shortened and the cost can be reduced.

Further, since the joint material 16 is filled in the bag body 17 in advance, the joint material 16 does not leak at the time of construction,
Therefore, when the block 11 is installed in water, the joint material is not washed away by waves, tidal currents, or wind, and the construction can be performed without being affected by the weather conditions at the site.

Furthermore, when the blocks 11 are stacked, the bag body 17 filled with the joint material 16 inside is flexible in the shape of the joint surfaces of the blocks 11 as shown in FIG. Since the irregularities are absorbed and the gaps between the irregularities are filled, the joint surface becomes uniform, and therefore, when the prestress is introduced, the blocks 11 do not transmit the prestress stress at the convex portions, and the entire joint surface is The stress can be transmitted, and the generation of cracks due to the stress concentration on the block 11 can be prevented.

Further, this has the advantage that the thickness of the joint portion can be secured and the thickness of the joint portion can be adjusted by the filling amount of the joint material 16.

After the joint material 16 is hardened, the same strength and elastic modulus as those of the concrete block 11 can be obtained, so that the joint material is not different.

FIGS. 6 and 7 show an example in which this joint structure is applied to a connecting block structure constructed by being integrated by a PC steel material penetrating a concrete block. FIG. 6 is a plan view of a bag body, FIG. 7 shows a sectional view thereof.

In the block 25 shown here, a sheath tube 26 penetrating in the axial direction is juxtaposed in the concrete body along the circumferential direction, and the sheath tube 26 of the bag body 17 set on the upper surface of the block 25 is exposed. A hole 27 through which the PC steel material 13 passes is formed at the position.

It should be noted that the block 2 has the above-described configuration of the bag body 17.
Since the interference of the PC steel material 13 penetrating 5 can be eliminated, it is possible to achieve the same effect as that of the embodiment shown in FIG.

Next, an embodiment of the second invention will be described with reference to FIG.

In the joint structure of one embodiment, as in the example shown in FIG. 6 and the like, a plurality of tubular precast concrete blocks 25 are stacked, and the PC steel material 13 penetrating each block 25 is inserted between the blocks 25. It is applied to a connected block structure integrally formed by.

However, in the embodiment of the second invention, the bag body 17 in which the joint material 16 is filled is provided along the outer bag 35 provided along the outer periphery of the block 25 and the inner bag of the block 25. The greatest feature is that the inner bag 36 is formed.

The outer bag 35 and the inner bag 36 are both formed of a strong non-woven fabric into a flat bag shape, and the outer bag 35 and the inner bag 36 have PCs on their opposite side surfaces, respectively.
The recess 37 for removing the interference of the steel material 13 is formed in a corrugated shape.

In the illustrated example, the ridges of the corrugations on the facing surfaces of the outer bag 35 and the inner bag 36 abut each other to form a space 38 surrounding the opening of the sheath tube 26 to surround the opening. Care is taken to prevent leakage of the grout material filled inside.

Thus, according to the joint structure having such a configuration, the bag body 1
Since 7 is composed of two bags, the outer bag 35 and the inner bag 36, the bag body 17 can be easily set on the joint surface of the block 25, and the workability thereof can be further improved.

Further, also in this embodiment, since the joint material 16 is filled in both the outer bag 35 and the inner bag 36, the joint material 16 will not be washed away by waves, tidal current or wind. It can be constructed regardless of the weather conditions at the site.

Further, according to this embodiment, the outer bag 35 and the inner bag 36.
By changing the filling amount of the joint material 16 into the block 25, the height inside and outside the block 25 can be freely adjusted.
Since each bag flexibly corresponds to the shape of the joint surface of the block 25 and absorbs the unevenness of the joint surface between the blocks 25, the block 25 can be stably installed and the levelness of the block 25 can be accurately adjusted. Can be adjusted.

At the time of introducing the prestress, the outer bag 35 and the inner bag 36 can achieve the stress transmission in the entire joint surface, so that the blocks do not transmit the prestress stress at the convex portions, It is possible to prevent the occurrence of cracks due to stress concentration.

"Effects of the Invention" As described above, according to the present invention, the following excellent effects are exhibited.

(a) According to the joint structure of the first invention, a joint structure of a connected block structure in which a plurality of precast concrete blocks are stacked and the blocks are integrated along the connecting direction of the blocks by the tension of the PC steel material. In addition, since the bag is composed of a bag body having a size interposed between the joint surfaces of the block and covering the joint surface, and a joint material filled in the inside of the bag body, a bag filled with the joint material. The body can absorb the unevenness of the joint surface of the block,
It is possible to prevent stress concentration when the PC steel material is strained, and it is possible to introduce pre-stress in a state where the joint thickness is surely secured, and at the same time, it is possible to improve the waterproofness.

In addition, the joint can be configured by the simple work of setting the bag body on the joint surface of the block, so the workability can be improved, and even if the bag body setting or the block installation fails, it can be easily redone. There is an advantage that it can be done.

Furthermore, since the joint material is filled inside the bag, there is an advantage that the pot life of the joint material can be extended.

(b) According to the joint structure of the second invention, a plurality of precast concrete blocks formed in a tubular shape are stacked on each other, and the blocks penetrate each other through the PC.
A joint structure of a connected block structure integrated by a steel material, a bag body having a size interposed between the joint surfaces of the block and covering the joint surface, and a joint material filled inside the bag body. Since the bag body is composed of an outer bag provided along the outer circumference of the block and an inner bag provided along the inner circumference of the block, the PC steel material is placed through the block. In such a case, there is an advantage that prestress can be introduced to the stacked blocks without adversely affecting the stacked blocks, and that the joint between the blocks can be reliably stopped.

[Brief description of drawings]

1 to 5 show an embodiment of the first invention, and FIG. 1 is a half sectional view of a piled connection block structure, and FIG.
FIG. 3 is a perspective view showing a precast concrete block and a bag, FIG. 3 is a cross-sectional view of a main part, FIGS. 4 and 5 are cross-sectional views shown for explaining the operation, FIG. 6 and FIG. The figure shows an application example of a connection block structure integrated by a PC steel material penetrating the block. FIG. 6 is a plan view, FIG. 7 is a sectional view taken along the line VII-VII in FIG. FIG. 8 is a plan view showing an embodiment of the second invention, and FIG.
1 to 12 show a conventional example of a piled connection block structure in the case of a breakwater, FIG. 9 is a perspective view with a part cut away, and FIG. 10 is shown for explaining a construction method. The cross-sectional views, FIG. 11 and FIG. 12 are cross-sectional views shown for explaining the operation thereof. 1 ... sea floor, 10 ... pile, 11 ... precast concrete block, 12 ... wedge fastening device, 12a ... annular member, 12b ... pile gripping member, 12c ... holding member, 13 ... PC steel material, 16 ... joint material, 17 ... bag, 25 ... precast concrete block, 26 ... sheath tube, 35 ... outer bag, 36 ... inner bag.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Yoshito Hatayama Yoshito Hatayama 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. Construction Co., Ltd.

Claims (2)

[Claims] 1. A joint structure of a connecting block structure in which a plurality of precast concrete blocks are stacked, and these blocks are integrated by tension of a PC steel material arranged along the connecting direction of the blocks, the jointing of the blocks. A joint structure of a connecting block structure including a bag body having a size interposed between the surfaces and covering the joint surface, and a joint material filled inside the bag body. 2. A joint structure of a connecting block structure in which a plurality of cylindrical precast concrete blocks are stacked, and these blocks are integrated by a PC steel material penetrating each block. The bag is composed of a bag body having a size interposed between the joint surfaces and covering the joint surface, and a joint material filled inside the bag body, and the bag body is an outer member provided along the outer periphery of the block. A joint structure of a connected block structure, comprising a bag and an inner bag provided along the inner circumference of the block.