JPH045103B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for reinforcing steel pipe piles of a structure made of steel pipe piles as shown in FIG. Figure 2 illustrates an example of such a pile. 1 is Nabashi and 2
is a steel pipe pile. Steel pipe piles are prone to corrosion in the parts that go into water or come in contact with the air, so if you protect those parts, you won't have to worry about corrosion. In the present invention, that part is placed in a concrete block to block air and prevent rust, and at the same time, prestress is applied to the block to form a new structure in which the steel pipe pile and block are integrated. be.

The construction method of the present invention will be explained using a pile bridge as an example. As shown in Fig. 2, first, the two halves of the upper block 3 as shown in Fig. 3 are put together through the stakes and integrated, and then the special bolts 4 are used to open the upper block 3 from the back side of the upper slab 1. Tightly tie as shown in Figure 2. Next, the couplers 7 and 8 are passed through the steel rods 5 and 6 suspended from the block 3, and the point device as shown in Fig. 4 is suspended from the steel rods 9 and 10 at a predetermined location where it will not corrode even though it is always submerged in water. This figure 4 case device is placed at the position of
The inner wedge 11 consists of an inner wedge 11, an outer wedge 12, and a plate 13.
It is divided into 4 parts, and the outer side has an outer wedge 1 at a specified angle.
2 and the inside are in surface contact with the steel pipe pile, and are connected to the steel rod 5 by the coupler 7 through the steel rod 9, and initially rest on the plate 13. Outer wedge 1
2 is integrated with the plate 13, and the two parts are integrated in contact with the pile at a predetermined position, and the inside is tapered, and the steel plate is in close contact with the inner wedge 11 at a predetermined angle. A rod 10 is connected to the steel rod 6 through a coupler 8. Next, when the nut 14 is tightened, the inner wedge 11 is pulled up along the taper of the outer wedge 12, so it is pulled up toward the pile 2 and comes into close contact with it, making it a fixed point for the pile. Become.

Next, the two-split block 16 as shown in FIG. 5 is placed between the stakes 2, the steel rod 10, the coupler 8, and the steel rod 6 are held inside, and integrated in accordance with the outer diameter of the outer wedge 12. Stack up until it touches the bottom of block 3. As shown in Fig. 5, this two-part block 16 is first assembled into two pieces as shown in A, and then tightened with steel bands, etc., and then the directions are made perpendicular to each other as shown in B, using steel bands, etc. Tighten with and stack them on the outside of the outer wedge. As a result of this operation, the outer wedge 12 is caused by the weight of the blocks 16 stacked above.
Assuming that it goes down along the outer surface of the inner wedge 11,
The inner wedge 11 will be further tightened to the pile 2,
The frictional force between the pile 2 and the inner wedge 11 increases to provide a predetermined fixed point. When the inner wedge 11 requires more frictional force, the nut 14 can be tightened to increase the frictional force. Next, as shown in Fig. 2, a flat jack 17 as shown in Fig. 6 is inserted between the top of the blocks 16 stacked up to block 3 and the contact surface of block 3, and the upper block 3 is moved by a reaction force. When pressure is applied using a flat jack as a support, post-tension is applied to the group of concrete blocks 16 through the steel rods 6. As a result, the block group becomes one, becoming a single structure, and it assumes the structural role of this part in place of the steel pipe pile.
This eliminates the problem of corrosion of the piles in this area. Next, grout is injected between the pile and the block from the injection port 18 of block 3 until it overflows from the top, and the steel rods 5, 6, 9, and 10 are placed in the mortar, and the blocks and the steel pipe pile are combined. When integrated, the post tension is held on the steel rod and prevents the pile and steel rod from rusting. Next, grout is injected into the space between the upper block 3 and the upper slab and the space where the block 3 and the flat jack 17 are located, so that the flat jack is also integrated.

In this way, the upper part of the pile is integrated with the upper slab, and the parts where there is a risk of corrosion are protected by the block and mortar.Structurally, the block bears the structural force due to the submerged part, and the bridge will be reinforced and regenerated as a permanent structure.

[Brief explanation of drawings]

Figure 1 is a general view of the pile bridge, Figure 2 is a schematic vertical cross-sectional view of the construction method according to the present invention, Figure 3 is the upper fixed block, Figure 4 is a diagram of the fixed point, and Figure 5 is a diagram of the intermediate block. , Figure 6 is the flat jack, C is before pressurization,
D is after pressurization. 1: Upper slab, 2: Steel pipe pile, 3: Upper fixing block, 4: Special screw for fixing upper block, 5:
Steel rod (for inner wedge), 6: Steel rod (for outer wedge),
7: Coupler for inner wedge, 8: Coupler for outer wedge, 9: Lower steel rod for inner wedge, 10: Lower steel rod for outer wedge, 11: Inner wedge, 12: Outer wedge, 1
3: Plate, 14: Inner wedge fixing nut (metal fitting), 15: Outer wedge fixing nut (metal fitting), 1
6: Intermediate block, 17: Flat jack, 1
8: Mortar injection hole, S: Water surface, L: Seabed surface.

Claims (1)

[Claims] 1. Protect the parts of the steel pipe piles that make up the bridges and quays that are exposed to water or air by stacking circular concrete blocks. Next, apply prestress to the steel pipe piles and the blocks with steel rods or wires to protect the steel pipes. A corrosion-resistant reinforcement method for a pile-structured bridge quay wall, which is characterized by integrating the piles and blocks and filling mortar between the steel pipe piles and the blocks.