JPH052770B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The method of the present invention relates to a technique for joining members when forming a point part underwater in a floating structure.

PRIOR ART There is a construction method in which a steel pipe pile is driven underwater, and a structure is constructed by creating a point part at the bottom or middle part of the pile. The means for attaching the member to the steel pipe pile,
Attach a member (bracing material) on land in advance to a short external pipe that is thicker than the pile diameter, insert the short external pipe from the top of the pile, drop it into water, and connect the pile to the short external pipe. There is a method of fixing by injecting a filler such as mortar between them (see JP-A-54-44301, JP-A-54-44316, etc.). This method forms a reliable case part underwater,
It has the effect of increasing the rigidity of the structure. However, in this type of construction method, it is necessary to temporarily fasten the pile and the member to each other until the specified connection is achieved by injecting filler. There are bonding methods, but all of these methods are extremely difficult to perform underwater.

It is also conceivable to carry out construction by suspending the members in the water using wire ropes, etc., but this requires a lot of man-hours, is extremely troublesome, and is uneconomical. Furthermore, even if a bonding method is applied by injecting filler, it is necessary to provide a seal to prevent the filler from leaking from the gap between the pile and the pipe until the filler hardens. It is necessary to take care so that the sealing member does not interfere with the tube insertion and positioning work.

For example, an expandable rubber tube may be installed on the inner wall near the lower end of the short outer tube, and compressed air may be introduced into the tube at a predetermined position to seal the bottom of the tube, or by explosive molding. There is also a method of sealing using rag, etc., but there are problems with ease of construction and reliability of the effect.

Therefore, recently, a plurality of ribs whose inner surfaces extend along the inner diameter surface are provided on the lower surface of a flange-like member having an inner diameter approximately equal to the outer diameter of the steel pipe to be cast. A support formed by pasting a sealing material to prevent filler leakage between the two is divided into two along a plane including the axis of the inner diameter surface, and a hinge connecting the two halves is attached to one end of the support. The other end is provided with a means for tightening and fixing the opposite end surface, and this is brought to a desired position underwater along the steel pipe to be cast, and the clamping support is temporarily fixed to the steel pipe by sandwiching the steel pipe from both sides. There is a method of easily forming an underwater point by fixing an external short pipe on the top surface and injecting and solidifying a filler in the gap formed between the pipe and the outer periphery of the steel pipe. was suggested.

However, even with this method, determining the position of the support underwater at the construction site and tightening the members are indispensable conditions for construction.

Purpose The method of the present invention is capable of extremely easily carrying out on-site underwater work for forming a point section in the above-mentioned construction method, and has the function of preventing leakage of filler injected for temporary fixing of members underwater. The aim is to provide a method that can serve both functions at the same time.

Configuration The method of the present invention includes: (1) A sealing member made of an elastic sheet is affixed to the upper surface of a flange-like member having an inner diameter slightly larger than the outer diameter of the cast steel pipe, and a sealing member made of an elastic sheet is attached between the flange member and the outer periphery of the steel pipe. At the same time, the member is inserted into and slidably into the steel pipe, and the lower surface of the member has a high frictional resistance surface portion on the end face facing the outer periphery of the steel pipe, and an arm portion extending in the diametrical direction of the flange member. A plurality of stoppers each having a hanging wire rope connected thereto are provided at the tip thereof, and the stoppers are pivotally supported on the lower surface of the flange member at a position closer to the center of the flange member than the center of gravity of the stopper itself. When the metal fitting is in a free state, the high frictional resistance surface part of the metal fitting is arranged so that it is locked to the outer surface of the steel pipe from the periphery, and on the other hand, the flange member itself is also provided with a temporary wire rope.
The steel pipe is inserted from the top end of the steel pipe with the sheet member facing upward, suspended by the hanging wire rope, and when the support is lowered along the steel pipe and brought to the desired position underwater, the temporary fixing wire is removed.・By holding the support flange member with a rope or releasing the support of the hanging wire rope in this state, the stopper was activated, and its high frictional resistance surface held down the steel pipe and temporarily fixed the support. After that, a short outer tube is placed on top of the upper sealing member to form a seal between the tube and the outer circumference of the steel tube.
When a fluid filler is injected between the tube and the top surface of the support flange, a seal is made between the lower end of the short outer tube and the upper surface of the support flange, and between the flange member and the outer periphery of the steel pipe to prevent the filler before solidification from leaking between them. 1. A method for temporarily fixing underwater members and preventing leakage of filler material, characterized by preventing the above.

(2) By providing the flange-like member with a short cylindrical portion that extends the inner diameter surface of the flange-like member along its central axis, avoiding the stopper provided on the lower surface of the flange-like member, the above-mentioned item (1) is achieved. ) Method for temporarily fixing underwater components and preventing leakage of filler material.

(3) The outer periphery of the flange-like member is fixed to the inner diameter surface of the short outer tube to integrate both members in advance, and the lower end of the temporary wire rope is connected to the upper edge of the short outer tube. The method for temporarily fixing an underwater member and preventing leakage of a filler according to the above item (1) or (2).

Now, the embodiment will be described below with reference to the drawings.

Embodiment 1 FIGS. 5 and 6 are partial front views of floating structures such as sea berths, dolphins, piers, or piers, in which the method of the present invention is carried out, and 1 in the figures indicates a structure in which the method of the present invention is applied to the bottom of the water. The piles 2 are made of steel pipes and are arranged in pairs or rows, and are members that connect the point parts of adjacent piles with braces, and are made of steel pipes or steel rods and are made of telescopic joints 3, such as turnbuckles. Attached. 4 is a support member for the short outer pipe 9, which is temporarily fixed to the steel pipe 1 at a required position of the cast steel pipe 1 in water or in the air, and at its upper flange surface 5;
The outer short pipe 9 inserted from the top end of the steel pipe is received, and a fluid filler is injected and solidified into the gap created between the steel pipe and the outer short pipe to form a case point. 12
A girder is a girder made of concrete material, and is made of prestressed concrete or I-shaped or H-shaped steel on a steel frame to connect the top ends of paired cast steel pipes to form sea berths, piers, bridge piers, etc. W and L indicate water level or sea level.

Figure 1 is an enlarged partial cross-sectional view of the point part including the supporting members provided on the driven steel pipe pile 1 during the construction of the floating structure shown in Figures 5 or 6, and Figure 2 is the It is a bottom view of the member, and in the figure, 1 is a steel pipe pile, 4 is a support member, and 9 is an outer member having a larger diameter than the steel pipe 1 but smaller in diameter than the support member and having a shorter length. When a fluid filler 10, such as expanded mortar, is injected and solidified between the inner diameter and the outer diameter of the steel pipe 1, the short pipe 9 is inserted to prevent the material from leaking. It is installed on the upper surface of the flange body 5 with its lower end surface in close contact with the seal seat plate 6 of the support member. A portion of the short outer tube 9 is provided with means for locking and fixing the end of a steel rod or steel pipe brace material as shown in FIG. 5 or 6. In order to form a strong case point, it is desirable to set the extrapolated short pipe and the steel pipe concentrically. Referring again to FIG. 1, the support member 4 is made of an elastic material, for example, which has an inner diameter slightly smaller than the outer diameter of the steel pipe 1, on the upper surface of the flange-like main body 5 whose inner diameter is slightly thicker than the diameter of the steel pipe 1. A seal seat plate 6 made of rubber or a somewhat hard sponge is pasted so that the support member 4 can be easily inserted into the steel pipe 1, and the member can slide relatively freely on the outer circumferential surface of the steel pipe to direct the steel pipe to a predetermined position. Although it is movable, it is provided so that the inner diameter of the seal seat plate 6 always seals between the outer periphery of the steel pipe and the inner diameter of the flange body, and the sealing action does not prevent the support member 4 from freely sliding against the steel pipe. be.

Reference numeral 7 denotes an attachment portion for the temporary attachment wire/rope 8 provided on the outer edge of the flange body 5. At least one pair of the attachment portion and the temporary attachment wire rope 8 must be provided (see FIG. 2). On the lower surface of the flange-like main body 5, the end surface facing the outer periphery of the steel pipe 1 is a high friction resistance surface 12, and a hanging wire rope 13 is provided at the outer end of an arm extending in a radial direction with respect to the pipe.
The fastener 11 connected to the
However, when the fastener is in a free state, the high frictional resistance surface 12 of the fastener is provided so as to suppress the outer surface of the steel pipe 1 from the surroundings. In addition, the wire rope 8
The other ends of 13 and 13 are each connected to a required control mechanism on the water.

A method for forming the case point portion using the above-mentioned support member 4 is as follows.

The steel pipe pile is inserted from the top end of the steel pipe pile 1 driven into the water bottom into the inner diameter of the support member 4 with the seal seat plate 6 facing upward, and the support member is slid downward along the steel pipe 1 and suspended. After gradually letting out the lowering wire rope 13 and bringing the member to the planned point formation position in the water, when the temporarily fixed wire rope is pulled up, the stopper 11 becomes free and each support shaft is pulled up. 14, and the high frictional resistance surface 12 holds down the surroundings of the cast steel pipe all at once, so the support member becomes temporarily fixed, and after loosening the hanging wire rope, the temporarily fixed wire rope is loosened. If this is done, all the weight of the support member 4 will be applied to the high frictional resistance engagement surface of the fastener 11, and temporary fastening will be realized more reliably.

At this time, it is desirable that the upper surface of the flange-like main body 5 of the support member 4 be temporarily fixed at right angles to the longitudinal axis of the steel pipe, so the operation of letting out the hanging wire rope should be performed carefully.

Since the inner diameter of the seal seat plate 6 is slightly smaller than the outer diameter of the steel pipe 1, the gap between the flange-like main body 5 and the steel pipe is always sealed, and even when a fluid filler is injected, the same area remains. There is no risk of leakage.

After the work of temporarily fixing the support member 4 in a predetermined position is completed, the short outer tube 9 is again inserted from the top end of the steel pipe to be cast and lowered along the steel pipe, and the lower end surface is attached to the seal seat plate of the support member 4 . 6 and place the pipe in a concentric position with the steel pipe pile. As shown in Figs. 5 and 6, the steel pipe brace material 2 is installed between the short outer pipes 9, and then a filler is injected and solidified into each, or a point is formed by injecting the filler. The end of the steel bar brace is locked between the locking parts provided in a part of the section, and the telescoping joint 3 is adjusted to generate an internal force in the structure. Since the outer short pipe 9 has a considerably larger diameter than the steel pipe, it is extremely easy to insert the steel pipe through it and install it on the support member 4 , but care should be taken to install it with the core exposed. Since the lower end edge of the short outer tube 9 is installed on the seal seat plate 6 of the support member 4 , there is no gap between it and the support member. Note that the diameter of the short outer tube 9 is not larger than the outer diameter of the flange-like main body 5 of the support member 4 .

Temporary fixing means for the support member 4 using this method can be used by using hanging wire ropes and It has features such as being able to repeatedly set the temporary fixing by manipulating the fixing wire/rope, and the temporary fixing mechanism working stronger as the load is applied to the upper surface of the support member. By connecting the hanging/temporary wire/rope used in the above-mentioned method to the support member 4 etc. via a hook, it is possible to recover it as needed after the work is completed.

Example 2 The construction method described in Example 1 is applicable to the steel pipe 1 of the support member 4 .
While there is an advantage in being able to perform the temporary fixing work underwater by controlling the wire rope from above the water, it is not always necessary to temporarily fix the upper surface of the flange-like main body 5 at right angles to the axis of the steel pipe pile 1. It's not easy. This inconvenience is caused by hanging
This can be solved by increasing the number of temporary wire ropes, but a simple means to improve this point is to extend the inner diameter surface of the flange-like main body 5 in the axial direction as described in Example 1. The short cylindrical body 15 sharing the same inner surface is attached to the lower surface of the main body 5, avoiding the stopper 11 and its support shaft.

FIG. 3 shows an enlarged sectional view of the same.
The members designated by the same reference numerals as those in the drawings have the same structure and effect as those described in the first embodiment, so their explanations will be omitted. 15 is a short cylindrical body that shares a cylindrical surface extending downward in parallel to the longitudinal axis direction of the steel pipe pile 1 with the inner diameter surface of the flange-shaped main body 5 constituting the support member 4 , and the upper end surface of the flange-shaped main body 15 5, and the upper surface of the flange-like main body 5 is held perpendicular to the axis of the steel pipe by sliding/contact between the inner surface of the cylindrical body and the steel pipe 1.
Of course, the cylindrical body 15 is provided with a plurality of windows on its circumferential wall through which fasteners or the like can pass.
The inner diameter of the cylindrical body 15 is larger than the diameter of the steel pipe pile 1, so that the fitting and sliding relationship between the two is smooth, but after this, the upper surface of the flange-like main body 5 is directly connected to the steel pipe. The angle should not be too far off. On the other hand, it is desirable that the axial length of the cylindrical body 15 be as short as possible.

As described above, by connecting the short cylindrical body 15 to the inner diameter lower surface of the flange-like main body 5, instead of maintaining the perpendicularity of the upper surface, the inner surface is at the same position as the inner circumferential wall of the short cylindrical body 15. It should be readily apparent from the enlarged sectional view shown in Figure 3 that it is possible to attach a plurality of ribs to the lower surface of the flange-like main body. In that case, it would be essential to provide at least three ribs. In short, if the perpendicularity of the upper surface of the flange-shaped main body to the axis of the cast steel pipe is guaranteed by regulating the inner peripheral surface of the cylinder or the inner surface of the rib, the operational difficulties described in Example 1 can be avoided. . However, by adding this means, it is not necessary to drastically change the case point forming method described in the first embodiment. The size of the gap between the regulating surface and the outer periphery of the steel pipe has a large effect on the difficulty of inserting and sliding the support member 4 on the steel pipe pile, so it is desirable to determine it based on experience.

Example 3 In both Examples 1 and 2 described above, the short outer pipe 9 is prepared separately from the support member 4 , and after the member 4 is temporarily fixed to the steel pipe 1, it is attached to the top end of the steel pipe pile. A method was adopted in which the device was inserted through the support member 4 and installed on the support member 4 . However, as explained in Example 1, in order to temporarily fix the support member 4 to the steel pipe 1, it is necessary to insert the support member 4 from the top end of the steel pipe in advance, and at the same time, the outer short pipe 9 is also inserted. It is better to insert it into the steel pipe because one of the steps can be omitted, and if the short outer pipe 9 is fixed to the support member 4 in advance, the space between the short outer pipe and the steel pipe pile can be fixed after temporarily fixing the support member. The process of checking whether the short outer pipe 9 and the steel pipe 1 are aligned in the center, etc. can reduce the gap by one that may cause a leakage accident when a fluid filler is injected into the pipe. It has the advantage of being unnecessary. The enlarged cross-sectional view of the case part shown in FIG. 4 shows the implementation of the above means, and in the figure, members given the same reference numerals as those in Example 1 are members having the same structure and the same effect as those in the same example. Therefore, the explanation will be omitted. However, the outer periphery of the support member 4 is welded to the lower side of the inner periphery of the short outer tube 9, and there is no gap between the two that is large enough to allow the filler 10 to leak. Therefore, the seal seat plate 6 only needs to seal between the flange-like member 5 and the outer periphery of the steel pipe 1 with its inner diameter surface. Of course, the seat plate 6 does not have enough elasticity to prevent the support members etc. from sliding along the steel pipe 1.

Further, the stopper 11 is pulled by the hanging wire 13 and swings around the shaft 14, but the lower end surface of the short outer tube 9 or the edge of the flange-like member functions as a stopper, and cannot be turned beyond a certain angle. The high frictional resistance surface 12 is provided so that it can reliably grip the outer periphery of the tube 1 when the wire 13 is loosened. Reference numeral 8 denotes a temporary fixing wire that guides the short outer pipe 9 and is connected at its upper edge. First, the above member is gradually slid and lowered along the steel pipe 1 using a hanging wire rope 13. The control of the tacking wire rope 8 then follows the action of the hanging wire rope, but when the member reaches the required position on the steel pipe 1, the tacking wire 1 is
3 or by suddenly loosening the wire 8, the high friction resistance surface 12 of the stopper 11
can be locked to the outer periphery of the steel pipe, and the case point forming member can be temporarily fixed at the same position. At the same time, centering between the short outer pipe 9 and the steel pipe 1 is also possible. When doing so, the hanging wire 13 serves as a weight, so the support shaft 14 of the stopper 11 can be provided outside the center of gravity of the metal fitting 11.

The subsequent process is the same as that described in Example 1.

According to the method of this embodiment, the temporary wire rope 8
Since the attachment part of the short pipe 9 is the upper peripheral edge of the short pipe 9, the short pipe 9
Since the vertical direction holding function is increased, the regulating means described in the second embodiment is no longer necessary. However, there is no particular negative effect or interference with the construction process.

Effects As described above, when the method of the present invention is used, it is possible to perform the temporary fixing work of the case point forming member by controlling it from above the water, and at the same time, it is possible to prevent leakage of the fluid filler injected into the part. This can be expected to have the effect of killing two birds with one stone.

[Brief explanation of the drawing]

1 and 2 are an enlarged cross-sectional view of one embodiment of the case point portion formed by carrying out the method of the present invention, and a rear view of the support member that is a component thereof, and FIG. FIG. 4 is a partially enlarged sectional view of another embodiment of the method of the invention, and FIG. 5 is a partial front sectional view of another embodiment of the method of the invention. FIG. 6 is a partial side view of a structure in which steel rods are used as brace materials, and FIG. 6 is a side view of a floating structure in which steel pipes are similarly used as brace materials. DESCRIPTION OF SYMBOLS 1... Casting steel pipe, 4 ... Supporting member, 5... Flange-shaped main body, 6... Seal seat plate, 8... Temporarily fastening wire/rope, 9... Outer short pipe, 10... Filling material, 11... Stopper, 13... Hanging wire.
rope.

Claims (1)

[Scope of Claims] 1. A sealing member made of an elastic sheet is attached to the upper surface of a flange-like member having an inner diameter slightly larger than the outer diameter of the cast steel pipe, thereby creating a gap between the flange member and the outer periphery of the steel pipe. At the same time, the member is inserted into and slidably into the steel pipe, and the lower surface of the member has a high frictional resistance surface portion on the end face facing the outer periphery of the steel pipe, and the end of the arm portion extending in the diametrical direction of the flange member has a high friction surface portion. A plurality of fasteners each connected to a hanging wire rope are provided, and the fasteners are pivotally supported on the lower surface of the flange member at a position closer to the center of the flange member than the center of gravity of the fastener itself, and the fasteners are in a free state. , the high-frictional surface of the metal fitting is arranged so as to be engaged with the outer surface of the steel pipe from the periphery, and the flange member itself is also provided with a temporary wire/rope. The sealing member is inserted through the tube with the sealing member facing upward, and the supporter is suspended by the hanging wire rope. When the supporter is lowered along the steel pipe and brought to the desired position underwater, the supporter flange member is temporarily fixed with the wire rope. , or by releasing the support of the suspended wire rope in this state, the stopper is actuated, and its high frictional resistance surface holds down the steel pipe to temporarily fasten the support, and then the upper sealing member is When a short outer tube is placed above and a fluid filler is injected into the gap formed between the tube and the outer periphery of the steel pipe, the gap between the lower end of the short outer tube and the upper surface of the support flange and the flange member 1. A method for temporarily fixing underwater members and preventing leakage of filler material, characterized by sealing between the outer periphery of the steel pipe and the outer periphery of the steel pipe, and preventing leakage of the filler material before solidification from between. 2. The flange-like member is provided with a short cylindrical portion that extends the inner diameter surface of the flange-like member along its central axis, avoiding the stopper provided on the lower surface of the flange-like member. The method for temporarily fixing an underwater member and preventing leakage of a filler as described in item 1. 3 The outer periphery of the flange-like member is fixed to the inner diameter surface of the short outer tube to integrate both members in advance, and the lower end of the temporary wire rope is connected to the upper edge of the short outer tube. A method for temporarily fixing an underwater member and preventing leakage of a filler according to claim 1 or 2.