JPH01190810A - Joint structure of connected block structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention "Industrial Application Field" The present invention is a connected block structure made by stacking a plurality of precast concrete blocks and integrating these blocks with PC steel materials arranged along the connection direction of the blocks. This relates to the joint structure.

"Prior Art" This type of connected block structure includes, for example, a piled connected block structure that is applied to marine structures such as breakwaters. This is a structure as shown in FIGS. 9 and 10, for example. That is, a plurality of piles 2 driven into the seabed L are used as a foundation, and a precast concrete block (hereinafter referred to as a block) 4 having a hole 3 and a flat top and bottom surface is used, with the piles 2 loosely inserted into the hole 3. In this state, the racks are passed between the piles 2 and stacked in multiple stages in a grid pattern.

The pile 2 and the block 4 are connected to each other by a wedge fastening device 5 that is suspended from near the upper end of the pile 2 by a PC steel member 7, grips the pile 2, and holds the block 4 from below.
and are integrally connected by the filling mortar 6 filled between the hole 3 of the concrete block 4 and the pile 2, and each block 4 is connected to the PCp material 7 suspended along the pile 2. are integrated with prestress introduced due to the tension of the

By the way, 1. Conventionally, the following three joints have been used as joints between each block in such a connected block structure.
Two hands and steps are applied.

The first method is to simply stack blocks without applying joint material.

The second method is to interpose a rubber sheet, urethane mat, etc. between the blocks.

The third method is to provide a joint made of an underwater curable resin adhesive.

[Problems to be Solved by the Invention] However, each of the three prior art techniques described above still has the following problems to be solved.

■ In the method of stacking blocks without applying joint material between the joint surfaces of the blocks, as shown in FIG. 4a, and when a large J is applied, such as when introducing prestress, the convex portion 4
There is a problem in that stress concentration occurs in a, and cracks occur due to tensile stress parallel to the joint surface (stress in the direction of the arrow X in the figure). Moreover, if no joint material is used between the joint surfaces of the blocks, there are problems such as seawater etc. entering through the gaps between the joint surfaces, corroding the PC steel material 7, or causing leakage of the filling mortar 6. Something.

■ Laying rubber sheets, urethane mats, etc. can be expected to prevent the filling mortar 6 from leaking and stop water, but
When the PC steel material 7 is under tension, as shown in FIG. 12, the rubber sheet, urethane mat 8, etc. may deform too much, or
There are problems in that it is difficult to prevent stress concentration due to partial cutting, and material changes and deterioration are likely to occur.

■ Joint materials such as underwater-curing resin adhesives begin to harden in a relatively short period of time, resulting in a short pot life and are difficult to use, especially in offshore construction where wind and waves are a factor. There is a problem. Moreover, once the joint material has hardened before joining, it is difficult to peel it off, making it impossible to rejoin it, making it difficult to achieve a uniform thickness, and making it expensive. There is a problem.

There is also a method of simply applying concrete or mortar between the joint surfaces of the blocks, but in the case of such a method,
Hard kneading makes it difficult to fill the entire joint surface, while soft kneading has the disadvantage that concrete and mortar leak from the joints during jointing. Particularly when the joints of blocks are underwater, there are problems such as mortar and concrete being washed away by waves and currents.

The present invention was proposed in view of the above circumstances, and its purpose is to provide good workability and to introduce prestress into stacked precast concrete blocks without causing any adverse effects such as cracks. It is an object of the present invention to provide a joint structure for a connected block structure, which can also reliably achieve water stoppage at joints between blocks.

``Means for Solving the Problems'' Therefore, the first invention provides a connected block structure in which a plurality of precast concrete blocks are piled up and these blocks are integrated by tension of prestressing steel members arranged along the connection direction of the blocks. The joint structure includes a bag interposed between the joint surfaces of the blocks and large enough to cover the joint surfaces, and a joint material filled inside the bag.

A second invention is a joint structure of a connected block structure in which a plurality of cylindrical precast concrete blocks are stacked together and these blocks are integrated by a PC steel wire passing through each block, The structure consists of a bag interposed between the joint surfaces of the blocks and large enough to cover the joint surfaces, and a joint material filled inside the bag, and the bag is arranged along the outer periphery of the block. It is composed of an outer bag with an inner wall and an inner bag along the inner circumference of the block.

``Function'' According to the present invention, joints can be constructed using a joining means that 1) sets a bag filled with base material on top of the installed blocks and stacks the blocks, making the work easier. Furthermore, since the bag is filled with joint material in advance, there is no leakage of joint material during construction.

Furthermore, when the blocks are stacked, the bag body filled with joint + A-gauge absorbs the unevenness of the joint surfaces of the blocks in accordance with the shape of the joint surfaces of the blocks, so the gaps between the uneven surfaces are filled. , the bonding surface becomes uniform,
Stress concentration during pcsua tension can be prevented.

"Embodiments" Examples of the present invention will be described below with reference to the drawings. Note that this embodiment is applied to a piled connected block structure, which is one type of connected block structures.

1 to 5 show an embodiment of the first invention, and in these figures, reference numeral IO indicates a pile driven into the seabed l, and a cylindrical shape is formed in the lower part of the pile IO. A wedge fastening device 12 is provided to hold the precast concrete block 11 from below. In the illustrated example, this fastening device 12 includes a PC steel material 13 suspended along a pile 1O, an annular member +2a fixed to the tip of the PC steel material 13 with the pile 1O loosely inserted, and a head portion. The cut cone is divided into multiple parts (three parts) in the axial direction, and the annular member +2 is used to grip the pile lO.
The pile gripping member 12b placed on top of a with the PC steel material 13 inserted therein and the pile gripping member +2b are tapered fitted from above to grip the pile IO and hold the block Il from below. and an annular holding member 12c.

The annular blocks I l and I l- are stacked on the ``-'' side of this holding member 12c, and each of these blocks +1. A bag body 17 whose joint surfaces are filled with a joint material 16 that constitutes the main part of the present invention.
is interposed.

First, the bag I7 to be filled with the joint material 16 will be explained. This bag 17 is made of strong non-woven fabric or the like and shaped into a flat bag to match the shape of the joint surface of the block 11 (in the illustrated example, the shape is a cast shape). Further, a part of the bag body 17 is provided with an injection port for filling the interior of the bag body 17 with the joint material 16 (not shown). Needless to say, this injection port is sealed after filling the bag body 17 with the joint material, and has a structure that prevents the joint material 16 from leaking to the outside. It should be noted that the bag 17 can also be made of a shaft-type fabric form.

On the other hand, examples of the joint material 16 include, but are not limited to, non-breathing type mortar, which has a hardening strength equal to or higher than that of concrete blocks and can provide sufficient adhesion without causing a breathing phenomenon.

In addition, the reference numeral 20 in the figure indicates the filling mortar filled between the hole of the stacked block 11 and the pile lO.

Next, to explain the case where the joint structure of the connected block structure configured as described above is actually installed on site, first, a pile 10 is driven into the seabed 1, and a wedge fastening device 12 is set at the bottom of this pile 10. Then, the bag 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 to match 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 molded into the bag body 17.
It is injected into the body.

Next, the bag 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 +2c.

In addition, if there is some time left until the installation of block +1, hang the bag 17 without setting it and install it, and before stacking the next block 11, the underwater worker (diaper)
The bag 17 filled with the joint material 16 may be set on the joint surface underwater.

Then, the above steps (block installation, bag body 1
Step 7) is repeated to stack up the blocks II, and the block 11 is installed in a predetermined shape and size.

In addition, during the construction, even if the joint surfaces of the stacked blocks 11 are inclined, as shown in FIG.
Since the bag body 17 is movable within the bag body 7, if some allowance is made in advance for the bag body 17, the overlying block II can be installed horizontally.

Once the block 11 is set in this way, after the mortar in the bag body 17 has hardened and cured, and after the joint material 16 has developed a predetermined strength, the PC steel material 13 is tensed with jacks to introduce prestress. The entire block II is integrated. Then, when filling the internal space surrounded by the pile lO and the block 11 with the filling mortar 20,
The constructed state is as shown in FIG.

Now, when the joint structure in the connected block structure is configured as described above, first, the installation is performed by setting the bag 17 filled with the joint material 16 on top of the block 11, and then
Since the joints can be constructed using a joining means that stacks up the joints, the workability is improved, and the construction period and cost can be reduced.

Furthermore, since the bag body 17 is filled with the joint material 16 in advance, the joint material 16 does not leak during construction.

Therefore, when installing blocks underwater, there is no possibility that the joint material will be washed away by waves, currents, wind, etc., and it is possible to install the blocks underwater without being influenced by the weather conditions at the site. Can be constructed.

Further, when the blocks 11 are stacked, the bag body 17 filled with the joint material 16 flexibly corresponds to the shape of the joint surfaces of the blocks 11, as shown in FIG. It absorbs the unevenness and fills the gaps between the uneven surfaces, making the joint surface uniform. Therefore, when introducing prestress, the blocks Il do not transmit prestress stress at the convex points, and the entire joint surface Stress transmission can be carried out, and cracks caused by stress concentration on block II can be prevented from occurring.

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

Note that after the joint material 16 hardens, it has the same strength and elastic modulus as the concrete block 11, so there is no need to use a foreign material in the joint.

Figures 6 and 7 show an example in which this joint structure is applied to a connected block structure that is integrated with a prestressed steel material that penetrates the concrete blocks. Figure 6 is a plan view of the bag body, FIG. 7 shows a cross-sectional view thereof.

The block 25 shown here has sheath pipes 26 that penetrate the concrete body in the axial direction and are arranged in parallel along the circumferential direction, and the sheath pipes 26 of the bag body 17 set on the upper surface of the block 25 are faced. A hole 27 through which the PC steel material 13 passes is formed at the position.

Note that, due to the configuration of the bag body 17, the block 2
Since the interference of the PC steel material 13 penetrating through the PC steel member 5 can be eliminated, it is possible to achieve the same effects as the embodiment shown in FIG. 1 and the like.

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. 13 is applied to a connected block structure formed integrally.

However, in one embodiment of the second invention, there is a joint 4N inside.
I1. The bag body 17 to be filled with +6 is placed in the block 25.
an outer bag 35 provided along the outer periphery of the block 25;
The main feature is that it is composed of an inner bag 36 provided along the inner circumference of the bag.

The outer bag 35 and the inner bag 36 are both formed into a flat bag shape using a strong non-woven fabric, and the opposing sides of the outer bag 35 and the inner bag 36 are coated with PC, respectively.
*The concave portion 37 for eliminating the interference of 4-4'13 is formed in a wave shape.

In the case of the illustrated example, the corrugated ridges on the opposing surfaces of the outer bag 35 and the inner bag 36 abut each other to form a space 38 surrounding the opening of the north tube 26 . Care has been taken to prevent leakage of the grout filled inside.

However, according to the joint structure of such a configuration, the bag body 1
Since the block 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 of the layer can be improved. .

Also in this embodiment, since both the outer bag 35 and the inner bag 36 are filled with the joint material 16, the joint material 16 will not be washed away by waves, currents, wind, etc. Construction can be carried out without being affected by on-site weather conditions.

Furthermore, according to this embodiment, the outer bag 35 and the inner bag 36
By changing the amount of joint material 16 filled into the block 25, the height of the inner and outer sides of the block 25 can be freely adjusted. Since it absorbs the unevenness of the joining surfaces, the block 25 can be installed stably, and the horizontality of the block 25 can be adjusted with high precision.

In addition, when introducing prestress, the outer bag 35 and the inner bag 36 can achieve stress transmission over the entire joint surface, so that the prestress stress is not transmitted between the blocks at the convex portions. It is possible to prevent cracks from occurring due to stress concentration.

"Effects of the Invention" As explained below, the present invention provides the following excellent effects.

(a) According to the joint structure of the first invention, a connected block structure is formed by stacking a plurality of precast concrete blocks and integrating the blocks by the tension of the prestressed steel material arranged along the connection direction of the blocks. This joint structure consists of a bag interposed between the joint surfaces of the blocks and large enough to cover the joint surfaces, and a joint material filled inside the bag. The filled bag can absorb the unevenness of the joint surface of the blocks, preventing stress concentration when tensioning the PC steel material, and prestressing can be introduced while ensuring the joint thickness. Two, its water-stopping properties can be improved.

In addition, since the joint can be constructed by simply setting the bag onto the joint surface of the block, the work efficiency can be improved, and even if you fail to set the bag or install the block, you can simply redo the tube. It has the advantage of being possible.

Furthermore, since the bag is filled with the joint material, it has the advantage that the pot life of the joint material can be extended.

(b) According to the joint structure of the second invention, the joint of a connected block structure is formed by stacking a plurality of cylindrical precast concrete blocks and integrating these blocks with a PC steel material penetrating each block. The structure consists of a bag interposed between the joint surfaces of the blocks and large enough to cover the joint surfaces, and a joint material filled inside the bag. Since it is composed of an outer bag provided along the outer periphery and an inner bag provided along the inner periphery of the block, it can be stacked in connection block structures where PC steel materials are placed through the blocks. This method has the advantage that prestress can be introduced without causing any adverse effects such as cracks on the blocks, and that water can be reliably stopped at the joints between the blocks.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of the first invention, in which Figure 1 is a half-sectional view of a piled connecting block structure, and Figure 2 is a perspective view showing a precast concrete block and a bag body. , Fig. 3 is a cross-sectional view of the main part, Fig. 4 and Fig. 5 are cross-sectional views shown to explain the function, respectively, and Fig. 6 and Fig. 7 are integrated by a PC steel material penetrating the block. This shows an example of the application of a connected block structure, and the 6th
The figure is a plan view, FIG. 7 is a sectional view taken along the line ■-■ in FIG. 6, FIG. 8 is a plan view showing an embodiment of the second invention, and FIGS. Fig. 9 is a partially cutaway perspective view, Fig. 1O is a cross-sectional view for explaining the construction method, Fig. 11 and Fig. FIG. 12 is a cross-sectional view shown to explain the respective functions. 1... Seabed, IO... Pile, 11... Precast concrete block, 1
2... Wedge fastening device, 12a... Annular member, -12b... Pile gripping member, 12c... Holding member, 13... PC @ material, 16... Joint material, 17...Bag body, 25...Precast concrete block, 26
- Sheath tube, 35...outer bag, 36...inner bag.

Claims (1)

[Claims] 1) A joint structure of a connected block structure in which a plurality of precast concrete blocks are piled up and these blocks are integrated by the tension of PC steel arranged along the connection direction of the blocks, and there is a joint structure between the joint surfaces of the blocks. A joint structure of a connected block structure consisting of a bag interposed therebetween and large enough to cover a joint surface, and a joint material filled inside the bag. 2) A joint structure of a connected block structure in which a plurality of cylindrical precast concrete blocks are stacked together and these blocks are integrated by a PC steel material penetrating each block, and the blocks are joined together. It consists of a bag body interposed between the surfaces and large enough to cover the joint surface, and a joint material filled inside the bag body, and the bag body is an outer bag provided along the outer periphery of the block. and an inner bag provided along the inner periphery of the block.