JP3095209B2 - Construction method of anchor for steel pipe column retaining wall - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a ground anchor from a joint between steel pipes in the construction of a retaining wall formed by connecting steel pipe piles in a column.

[0002]

2. Description of the Related Art As a retaining wall or a partition at a construction site, a retaining wall in which steel pipe piles are connected and driven in a columnar manner has been used. The retaining wall is formed by connecting steel pipe piles provided with joints along the longitudinal direction on both sides of the steel pipe to each other via joints, and formed into a pillar-column wall shape. It is made to be piled up.

Conventionally, when an anchor is installed on the earth retaining wall, a hole for an anchor is previously formed in a steel pipe main pipe at a factory, and a ground anchor is installed at a construction site through the hole. However, this method has a problem that it is not possible to cope with a design change such as addition of an anchor or change of a construction position. Therefore, a method was adopted in which an anchor hole was constructed on the joint of a steel pipe pile where drilling was easy so that an anchor could be driven (Japanese Patent Application No. 5-311391).
No.) has been proposed.

By the way, in the retaining wall of the steel tube column, the fitting portion of the male joint 3 and the female joint 4 is covered with the soil cement 7, so that the waterproofness of the joint portion 5 is maintained. Anchor hole 8a at the site of the joint as described above
In the method of providing the joint, vibrations are applied to the joints 3 and 4 at the time of drilling, so that the joints 3 and 4 may be separated from the soil cement 7 and water may be formed, which may cause adverse effects such as lowering water stoppage. Since the male joint 3 has a small diameter and a large curvature,
The drilling is difficult and the vibration caused by the drilling is large.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem. A discontinuous portion is provided at least in a male joint of a joint portion, and the hole is drilled in the portion to drive an anchor. It aims to easily and efficiently drill holes in the anchor hole, reduce vibrations caused by drilling, and prevent the occurrence of water leakage due to separation of soil cement from the joint part and its surroundings. is there.

[0006]

The construction of the present invention for achieving the above object will be described with reference to the drawings corresponding to the embodiments.
In the construction of the steel pipe column retaining wall A in which the anchors 15 are cast from the joints 5 connecting the joints 1 to each other, the male joints 3 of the steel pipe piles 1 must be prepared in advance over the required length near the place where the anchor hole 10 is cut. The discontinuous portion 6 is provided, and the steel pipe piles 1, 1
After the connection, the anchor hole 10 is cut from the portion of the joint portion 5 where the discontinuous portion 6 is located to the depth of the ground B, and the water blocking plate 12 joined to the outer surface of the female joint 4 is formed in the anchor hole. Is provided on the outer periphery, and is inserted into the water stop plate 12 so that the discharge pipe 13 is provided.
After inserting a short mouth pipe 11 provided with a watertight plate 12 to the outer surface of the female joint 4 in a water-tight manner, the stopper 15 is inserted through the anchor 15 and the cement milk injection pipe 16. 17 is fitted to the mouth pipe 11, cement milk is injected, and the gap between the anchor hole 10 and the inner periphery of the anchor hole 10 and the mouth pipe 11 is filled with cement milk.

[0007] The construction method of claim 2 is characterized in that, in the method of claim 1, discontinuous portions 6 and 7 are provided on both the male joint 3 and the female joint 4 of the steel pipe pile 1. It is.

[0008] The construction method of claim 3 is characterized in that the steel pipe pile 1
In the construction of the steel pipe column retaining wall A in which the anchors 15 are cast from the joints 5 connecting the joints 1 to each other, the male joints 3 of the steel pipe pile 1 or both of the male joints 3 and the female joints 4 are previously anchored.
Cut lines 3a, 3a,
4a, 4a are provided, and at the construction site, after the steel pipe piles 1, 1 are connected to each other, the score lines 3a, 3a, 4a, 4a
The discontinuous portions 6 and 7 are formed by removing the portion between them, and an anchor hole 10 is cut from the location of the discontinuous portions 6 and 7 of the joint portion 5 to the depth of the ground B. A mouth pipe which is provided on the outer surface of the female joint 4 so as to protrude outward and has a short water stop plate 12 which is inserted into the water stop plate 12 and provided with a discharge pipe 13 and which protrudes outwardly. After the water stop plate 12 is fixed to the outer surface of the female joint 4 in a water-tight manner and attached thereto, the stopper 17 inserted through the anchor 15 and the cement milk injection pipe 16 is fitted into the mouth pipe 11. It is characterized in that cement milk is injected and cement milk is filled into the gap between the anchor hole 10 and the inner periphery of the anchor hole 10 and the mouth tube 11.

[0009]

Vibration is applied to the drilling of the joint portion 5 of the steel pipe pile 1. Particularly, since the male joint 3 has a large curvature, drilling is difficult, and the vibration accompanying the drilling is relatively large. There is a possibility that the water stoppage may decrease due to the separation of the skin from the skin.

According to the construction method of the first aspect, since the drilling of the male joint 3 is not required, the generation of vibration at the time of drilling is greatly reduced. According to the construction method of claim 2, since the male joint 3 and the female joint 4 do not require drilling, vibration during drilling hardly occurs, and drilling work can be extremely easily and efficiently performed. In the construction method according to the third aspect, since one or both discontinuous portions of the two joints 3 and 4 are formed at the construction site, the fixing work of the joints 3 and 4 and the mounting accuracy thereof can be improved.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan sectional view showing an embodiment of a steel pipe column retaining wall constructed according to the present invention, FIG.
Is an enlarged side view of the main part. 3 and FIG.
It is the perspective view which showed the joint part of the steel pipe pile used by this invention.

In these figures, reference numeral 1 denotes a steel pipe pile, and a male joint (O joint) 3 and a female joint (C joint) 4 for connecting the steel pipe piles 1 and 1 are provided on both opposite outer surfaces of the steel pipe 2. , Are fixed along the longitudinal direction of the steel pipe 2, and the joints 3 and 4 are fitted to each other to form a joint portion 5. In the male joint 3, the discontinuous portion 6 is formed by cutting off the vicinity of the position where the anchor 10 is cast over a required length.
This discontinuous portion 6 is created in a factory or the like in advance.

The above-mentioned steel pipe piles 1, 1 are provided with excavation holes 8,
8 are continuously formed and filled with the soil cement 9, and the soil cement 9 is sunk into the soil cement 9 by fitting the joints 3 and 4 therein, thereby forming the steel pipe column retaining wall A. After that, the ground on one side, which is the building construction side, is dug down and exposed. Then, the anchor hole 10 is cut through the predetermined portion of the female joint 4 located at the discontinuous portion 6 of the male joint 3 to the depth of the ground B.

After the drilling of the anchor hole 10, a water stop plate 12 to be joined to the outer surface of the female joint 4 is provided so as to protrude on the outer periphery, and is inserted into the water stop plate 12 to provide a discharge pipe 13. tube
11 is inserted into the anchor hole 10 from the female joint 4, and the water stop plate 12 is fixed to the female joint 4 by welding or using an adhesive in a watertight manner. And anchor 15 and cement milk injection tube
The plug 17 into which the plug 16 has been inserted is fitted into the base end of the mouth tube 11.
At this time, the distal end of the anchor 15 reaches the inner part of the anchor hole 10, and the base end of the anchor 15
So that it protrudes outward beyond 18.

Next, cement milk 20 is pumped and injected into the anchor hole 10 from the injection pipe 16. The injected cement milk 20 fills the anchor holes 10. At this time, the air in the anchor hole 10 is discharged from the discharge pipe 13 to the outside of the hole. Further, the filling of the cement milk 20 is confirmed by discharging the cement milk 20 from the discharge pipe 13.

If the mouth tube 11 is formed to have a slightly smaller diameter than the anchor hole 10 as shown in FIG. 2, the inner wall of the anchor hole 10 and the outer periphery of the mouth tube 11 are formed by the injection pressure of the cement milk 20. A part of the cement milk 20 flows into and is filled in the gap between the mouth pipe 11 and the inside of the joint part 5 in a more watertight manner, and the part where the anchor hole 10 of the soil cement 9 is cut. Will be reinforced.
Further, a perforated tube can be used as the mouth tube 11.

After the injected cement milk 20 is solidified, the mounting seat 21 is inserted into the base of the anchor 10, and the nut 22 is screwed and tightened to complete the construction.

FIGS. 5 to 7 show another embodiment of the present invention. That is, in the present invention, as shown in the figure, the female joint 4 can be provided with a discontinuous portion 7 lacking this, facing the discontinuous portion 6 of the male joint 3. In this case, the soil cement 9 in the joint portion 5 is exposed at the discontinuous portions 6 and 7. The drilling of the anchor holes is performed through the exposed soil cement 9 points,
Since no drilling of the female joints 3 and 4 is involved, vibration due to drilling is almost eliminated, and construction is extremely simple.

FIG. 8 shows another embodiment in which the male joint 3 is provided with a discontinuous portion 6. In this example, a male joint 3 having cut lines 3a, 3a at positions corresponding to both ends of the discontinuous portion 6 is fixed to the steel pipe 2, and a portion between the cut lines 3a, 3a is applied by applying a blow at a construction site. Is removed to form the discontinuous portion 6. In this case, the operation of fixing the male joint 3 to the steel pipe 2 and the accuracy can be improved as compared with the embodiment of FIG.

FIG. 9 shows another embodiment in which discontinuous portions 6 and 7 are provided in both the male joint 3 and the female joint 4. In this case, the cut lines 4a, 4a are also provided in the female joint 4 similarly to the male joint 3 described above, and the discontinuous portions 6, 7 are formed at the construction site. The cut lines 4a, 4a of the female joint 4 may be provided only at the joint part on the side where drilling starts, and only that part may be removed.

[0021]

As described above, according to the present invention,
At the construction site, when drilling an anchor hole through a joint, since there is no male joint or both of this and a female joint at the drilling location, the vibration accompanying the drilling is greatly reduced, or This can be performed with almost no occurrence, and there is no possibility that the skin is separated from the joint and the soil cement due to the vibration, and the water stopping property at the joint can be favorably maintained. Further, since there is no drilling in one or both of the joints, drilling of the anchor hole can be easily and efficiently performed, and workability at the site is improved.

[Brief description of the drawings]

FIG. 1 is a plan sectional view showing one embodiment of a steel pipe column bank retaining wall according to the present invention.

FIG. 2 is an enlarged side sectional view of the main part.

FIG. 3 is a perspective view showing a main part of the steel pipe used.

FIG. 4 is a perspective view showing a drilled state of the joint.

FIG. 5 is an enlarged side sectional view of a main part showing another embodiment of the present invention.

FIG. 6 is a perspective view showing a main part of the steel pipe.

FIG. 7 is a perspective view showing a drilled state of the joint.

FIG. 8 is a perspective view of a main part showing another embodiment of a steel pipe to be used.

FIG. 9 is a perspective view of a main part showing still another embodiment.

[Explanation of symbols]

 A Steel pipe column retaining wall B Ground 1 Steel pipe pile 3 Male joint 3a, 4a Cut line 4 Female joint 5 Joint part 6, 7 Discontinuity part 9 Soil cement 10 Anchor hole 11 Base pipe 12 Water stop plate 13 Discharge pipe 15 Anchor 16 Injection tube 17 Plug

Continuation of the front page (56) References JP-A-5-195526 (JP, A) JP-A-7-82739 (JP, A) JP-A-53-55205 (JP, U) (58) Fields investigated (Int) .Cl. ⁷ , DB name) E02D 5/02-5/20 E02D 17/04 E02D 5/74-5/80

Claims (3)

(57) [Claims] In the construction of a steel pipe column retaining wall in which an anchor is cast from a joint section connecting steel pipe piles, a male joint of the steel pipe pile is previously extended over a required length near a place where an anchor hole is formed. A discontinuous part is provided, and after connecting the steel pipe piles, from the place where the discontinuous part of the joint part is,
After shaving the anchor hole to the depth of the ground, a water-stop plate to be joined to the outer surface of the female joint is provided on the anchor hole so as to protrude to the outer circumference, and a short pipe is provided in the water-stop plate to provide a discharge pipe. After inserting the mouth tube and attaching the water stop plate to the outer surface of the female joint in a water-tight manner, a stopper inserted through the anchor and the injection tube of the cement milk is fitted to the mouth tube, and the cement milk is inserted. And filling the gap between the anchor hole and the inner periphery of the anchor hole with the mouth pipe with cement milk. 2. The method according to claim 1, wherein a discontinuous portion is provided in both the male joint and the female joint of the steel pipe pile. 3. In the construction of a steel pipe column retaining wall in which an anchor is cast from a joint connecting steel pipe piles, a place where an anchor is previously formed in a male joint of the steel pipe pile or in both of the male and female joints. A cut line is provided in the vicinity of the top and bottom, and at the construction site, after connecting the steel pipe piles, a portion between the cut lines is removed to form a discontinuous portion, and from a place where the joint portion has the discontinuous portion, After shaving the anchor hole to the depth of the ground, a water-stop plate to be joined to the outer surface of the female joint is provided on the anchor hole so as to protrude to the outer circumference, and a short pipe is provided in the water-stop plate to provide a discharge pipe. After inserting the mouth pipe and fixing the water stop plate to the outer surface of the female joint in a watertight manner,
A plug body inserted through an anchor and an injection pipe for cement milk is fitted to the mouth pipe, cement milk is injected, and the gap between the anchor hole and the inner circumference of the anchor hole and the mouth pipe is filled with cement milk. Construction method of anchor on steel pipe column soil retaining wall.