JPH0224407A - 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 Field of Application J The present invention is based on stacking a plurality of precast concrete blocks so that pre-cast concrete blocks are inserted through them, and arranging steel materials so as to penetrate each of these blocks. An RC1# structure is formed by grouting between the steel material insertion hole of the block and the RC structure by filling mortar or concrete between the moeki pile and the pile insertion hole of the RC structure. This relates to a connected block structure in which the pile and the pile are integrated.

``Prior art'' As this type of connected block structure, for example,
There are piled connecting block structures applied to offshore structures. For example, as shown in Figures 13 and 14, this is based on a plurality of shafts 2 driven into the seabed.
A precast concrete block (hereinafter referred to as a block) 4 having holes 3 and flat upper and lower surfaces has a resistance of 2
The racks are passed between the resistors 2 while being loosely inserted into the holes 3, and are stacked in multiple stages in a grid pattern. The surface pile 2 and the block 4 have a scrap material 7 passing through the hole 3 from near the upper end of the pile 2.
They are integrally connected by a wedge fastening device 5 which is suspended by a wedge fastener 5 to grip the pile 2 and hold the block 4 from below, and a filling mortar 6 filled between the hole 3 of the concrete block 4 and the concrete block 2. There is.

According to the pile driving connected block structure of the above structure, the structure can be quickly and safely constructed on soft ground without performing ground improvement or underwater work, etc., and the workability at sea is improved. It has the advantage of being good.

"Problems to be Solved by the Invention" However, in the structure described above, since the steel material 7 is passed through the hole 3 for inserting the pile 2, the following problem has occurred.

(2) In terms of strength, it is preferable to match the centroid of the concrete cross section with the centroids of the plurality of steel members 7, but since the steel members 7 move freely within the hole 3, it is difficult to match the centroids.

(2) Since the distance from the compression edge to the steel material 7 is short and the number of scrap materials 7 arranged is limited, the bending strength is small considering the shape.

■When joining the blocks 4 together underwater, special measures are required such as having a diver monitor and guiding them or using a special guide jig so that the surfaces do not become misaligned.

The present invention has been proposed in view of the above circumstances, and its purpose is to provide a connecting block structure that can solve the above problems.

[Means for Solving the Problems] Therefore, in the connected block structure of the present invention, a plurality of precast concrete blocks are piled up with piles driven in such a way that the upper part thereof protrudes, and the piles are inserted through the piles, and the plurality of precast concrete blocks are piled up. A plurality of steel members are arranged so as to pass through each block, and grout is injected between the steel members and the steel material insertion hole of the precast concrete block, and mortar or mortar is injected between the pile and the pile insertion hole of the precast concrete block. A connected block structure in which the pile and the plurality of precast concrete blocks are integrated by filling with concrete, and the plurality of steel insertion holes formed in the precast concrete block are connected to the pile insertion hole. are separately provided outside the pile insertion hole at intervals in the circumferential direction.

"Function" When a steel material is inserted into a precast concrete block and lowered, the steel material can be used as a guide, which improves the accuracy of block arrangement compared to conventional ones.

Furthermore, the steel material can be placed close to the edge of the cross section, increasing the bending strength.

"Embodiments" Examples of the present invention will be described below with reference to FIGS. 1 to 12.

In these figures, reference numeral 10 is a shaft driven into the seabed 1, and a block 11 is fixed to the lower part of this pile IO, and a ring-shaped precast concrete block I is fixed on the block 11. 2,13...
. . . are stacked, and a plurality of steel members 14 are arranged, each having its lower end fixed to the block 12 and extending upward so as to pass through each block 13 . Then, by applying grout between the steel material 14 and the scrap material insertion holes of blocks l2 and 13, each block l
2 and 13 are integrated as an RC structure.

Each joint of the blocks 12, 13, . . . is provided with a joint portion 15 made of an underwater curable resin adhesive material or an underwater inseparable mortar material. Here, as an underwater curing resin adhesive material, Subcoat S
(Venetianison force, manufactured by Bernici), etc. are used, and as underwater-curable non-separable mortar materials,
A mixture of early-strength Portland cement, fine aggregate, and special admixtures (for example, Akrys 12, manufactured by Nisso Master Builders) in a predetermined proportion is used. These joint materials have strength comparable to or greater than concrete.

Furthermore, each block 12. which has the RC structure as described above.
13... are integrated with the IO by further injecting a filler 16 such as mortar between the resist 10 and the pile insertion hole 3.

Next, to explain the blocks 12, 13, etc. in detail, the block 12 is arranged at the lowest end of the connecting block structure, and reinforcing bars are buried inside, and the lower end of the steel material 14 is A fixing part 17 is buried therein, and a sheath pipe 18 is provided so as to cover the steel material 14 from the fixing part I7 toward the upper end. The sheath tube 18 is arranged separately from the pile insertion hole 3 at intervals in the circumferential direction on the outside of the pile insertion hole 3. Note that a grout injection hole 19 communicates with the lower end of this sheath pipe 18 .

On the other hand, the block 13 stacked on top of this block 12 has reinforcing bars buried inside it like the block 12, and a sheath that forms an insertion hole for the steel material 14 inside the concrete, as shown in FIG. A pipe 18 is buried.

The structure of the joints of the blocks 12, 13, . . . is as shown in FIGS. 6 and 7. That is, on the joint surface 12a facing the upper part of the opposing joint surfaces of both vertically adjacent blocks 12° I3, the sheath pipe 18 protrudes upward from the joint surface 12a so as not to be blocked by the joint material. On the other hand, a fitting hole 20 is formed in the joint part 13a facing the lower part, into which the protruding part of the sheath tube 18 is loosely inserted and which communicates with the scrap material insertion hole.
The inner surface 20a of the fitting hole 20 is formed in a tapered shape (for example, a conical shape) that tapers toward the inner side.

Here, as shown in FIG. 6, the protrusion length H of the sheath pipe 18 should be higher than the thickness T of the joint I5 provided at the joint, and for example, the thickness of the joint material applied is usually Size that can absorb unevenness (10mm to 3mm)
), the height is set to correspond to this size range.

Although an example of the joint between blocks 12 and 13 has been described above, the structure of the joint between blocks 13 is also the same as that between blocks 12 and 13, so a description thereof will be omitted.

The adhesive force of the filler 16 influences the bonding force between the blocks 12, 13, etc. of the resistance 10 and 1' (C structure. In order to increase the bonding force, the filler I6 is High-strength, non-breathing prepact mortar or underwater concrete is used.

Further, a steel pipe having ribs R and dowels formed on the outer surface is used for the anti-IO.

Next, a method of constructing the connecting block structure will be explained.

To build this pile driving connected block structure, first
As shown in the figure, a pile lO is driven into the seabed 1, and this pile 1
After setting the block 11 at the bottom of the receiver, the block 12 is placed on top of the block 11, and while inserting the steel material 14 into the sheath pipe 18 on top of this block 12,
As shown in FIG. 2, the blocks 13 are stacked in order.

Steel! For the insertion operation in step 4, insert the tip of steel material ■4 into block 1.
The steel material 14 is inserted into the fitting hole 20 of the joint part 13a facing the lower part of the steel material 14. In particular, since the inner surface 20a of the fitting hole 20 is tapered toward the inner side, the steel material 14 is inserted At the same time, the steel material I4 is guided into the sheath pipe 18 along the taper, so that the steel material I4 can be easily inserted and the workability can be improved.

In addition, when stacking blocks 12 and 13, if an underwater curing resin adhesive material is used as the joint material between the blocks, the bottom of the upper block 13 on land should be used as shown in FIG. After applying the side joint material, it is lowered into the sea, and is joined face-to-face with the lower block 12 that has been installed in advance. At that time, as shown in Figure 1, anchor block! Steel material 14 protruding upward from 2
serves as a guide, and each block 13 can be lowered and installed with high precision as shown in FIG.

In addition, if the joint material is, for example, an underwater curing resin-based adhesive material, its hardness can be adjusted by mixing the main agent and a hardening agent, and it can have a hardness similar to that of a cement paste before hardening. Therefore, it can be easily applied to the protrusion joint surface. In addition, the joint material adheres well to concrete due to its adhesive properties, so it will not be washed away by waves or currents or peeled off when the block is installed underwater. Since the blocks are installed, the adhesive material deforms due to the weight of the blocks themselves at the same time as the blocks are installed, which has the advantage of completely filling the gaps between the blocks.

On the other hand, when a mortar material that is not separable in water is used as the joint material, block 12. as shown in FIG.
The procedure is to attach packing 30, 31 to the outer and inner edges of the upper surface of block 13, spread mortar 15 as shown in Fig. 1θ, then suspend it into water, and install the next block 13 before the joint material hardens. Step on.

After completing the installation of all the blocks 12 and 13 through the above work, a reaction force is applied to the blocks 12 and 13,
5 to 6 kg/c using jacks on any number of steel materials 14
A tensile force of about II'' is introduced.

This makes the bonding state between the blocks 12 and 13 more reliable. In this state, grout is injected through the injection port 19 to form the blocks 12.1 and 12.3 into an integral RC structure.

Next, mortar or concrete is filled between the resistor 10 and the pile insertion hole 3, and the pile 10 and the block 12 of the RC structure are
．． 13 (see Figure 3).

According to the connected block structure having the above configuration, each block 1
2.13 The block 12.13 and the pile are not only integrated with the RC structure, but also have an RC structure with the filler 16 injected between the anti-IO and anti-insertion shaft 3. 1
Since it is integrated with 0, it has strong rigidity as a whole.

In addition, if a pile IO with ribs and dowels formed on the outer periphery is used, the bonding strength between the pile IO and the filling concrete (mortar) can be strengthened, and in that case, bending force is applied. In such a case, the pile 10, the filling concrete, and the blocks I 2, 13 deform as one, and a stronger yield strength can be exhibited.

In addition, in this embodiment, joints 15 having a strength equal to or higher than concrete are provided between each block 12 and 13 in order to absorb the unevenness of the block surface, so that the force in the axial direction parallel to the anti-IO is Or if a bending moment is applied,
The stress generated on the joint surfaces of each block 12, 13 can be made uniform, and as shown in FIG. 15, problems such as stress concentration on the convex portions and cracks can be prevented.

FIG. 11 shows another embodiment of the invention. The feature of this example is that adjacent sheath tubes (*material insertion holes 8) are communicated with each other through a communication hole 40.

In this way, when grouting the inside of the sheath pipe I8, it is sufficient to grout every other or every second part, which is particularly advantageous when there are a large number of grouted parts.

FIG. 12 shows still another embodiment of the present invention. The feature of this example is that a fixing part 17 (filling anchor) is provided not in the block 12 at the lowest end but in the middle of the middle block 13, and the waste material 14 is extended upward from the middle of the block.

By doing this, block 12.13 of the RC structure
The amount of scrap material can be changed from the middle of the cross section of the column made of steel, making it possible to arrange the ideal steel material according to the applied load.

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

(2) A special hole is formed in the block for inserting the steel material, and the location in the block where the steel material is inserted can be determined in advance. Therefore, the steel material can be easily installed at the designed position, and there is almost no loss in bending strength due to construction errors.

■Steel materials can be installed close to the edge of the cross section,
When compared with the conventional method using the same amount of scrap material, the bending strength is increased.

■The degree of freedom in selecting the number and diameter of steel materials is greater than that of conventional models, allowing the selection of steel materials that match the required strength.

Furthermore, by installing fill-in anchors in the middle of the blocks, you can change the amount of steel from the middle of the column cross section, making it ideal for the applied load! +4 placement is possible.

■When installing blocks by hanging them, the body material can function as a guide, dramatically improving the accuracy of block installation. This eliminates the need for underwater monitoring using a dialer during installation.

[Brief explanation of the drawing]

Since Figures 1 to 10 show one embodiment of the present invention, Figures 1 to 3 are half-sectional views showing the construction procedure of a pile driving connected block structure, and Figure 4 is a perspective view of the block. Fig. 5 is a plan view showing the state in which the packing is attached around the sheath tube, Figs. 6 and 7 are sectional views showing the joints of the blocks, and Fig. 8 is shown to explain the operation. 9 and 10 respectively show the structure of a block when an underwater hardening type underwater inseparable mortar material is used as a joint material. FIG. 9 is a plan view of the block, and FIG. The figure is a sectional view of the main part, and FIGS. 11 and 12 are diagrams showing other embodiments of the present invention. Figures 13 to 15 each show conventional examples of piled connecting block structures for breakwaters, with Figure 13 being a partially cutaway perspective view, and Figure 14 for explaining the construction method. FIG. 15 is a cross-sectional view of the joint portion. ! ... seabed, 3 ... pile insertion hole, body 10
...Pile, 11...Uke is block, 12
．． 13... Precast concrete block,
14... Body material, 15... Joint part, 16...
... Filling material, 17 ... Fixing section, 18 ...
- Sheath tube (14 material insertion hole).

Claims (1)

[Claims] A plurality of precast concrete blocks are stacked with the piles driven so that the upper part protrudes, the piles are inserted through the piles, and a plurality of steel members are placed so as to be inserted through each of the plurality of precast concrete blocks, and the steel members and the precast The pile and the plurality of precast concrete blocks are integrated by injecting grout between the steel material insertion hole of the concrete block and filling mortar or concrete between the pile and the pile insertion hole of the precast concrete block. The plurality of steel insertion holes formed in the precast concrete block are provided separately from the pile insertion hole and at intervals in the circumferential direction on the outside of the pile insertion hole. A connected block structure characterized by: