JPH0874250A - Anchor constructing device under pressurized water - Google Patents

Abstract

PURPOSE: To stabilize the supply of pressurized air by connecting a packer connecting rod to a packer in a guide by means of a telescopic pipe, and making up respective rods mutually telescopically and rotatably. CONSTITUTION: When an assembled-processed tendon 49 is inserted into a casing 47 after a primary grouting is completed for constructing an anchor, a packer 50 is preliminarily mounted so that it can be housed in a guide pipe 43. In this case, the packer 50 and a packer connecting rod 25 of a swivel are connected together by a telescopic pipe 51, and respective rods 51a, 51b, and 51c of the telescopic pipe are made to be mutually and freely rotated, and expanded and contracted. Then, the casing 47 is withdrawn while a grouting material is processed-injected. When the packer 50 is connected to the packer connecting rod 25 by the telescopic pipe 51, and the casing 47 is pulled up to a connecting position, pressurized air is sent from an air coupler. Thus, even when a torque is generated between the packer connecting rod and the packer in the process where pressure reducing operations are repeated after a specified work is completed, a space in the telescopic pipe is not interrupted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anchor building device under pressured water.

[0002]

2. Description of the Related Art Various construction methods are provided for constructing an anchor for fixing a connecting wall to the ground. However, in the construction of the anchor, there are few effective construction methods in the ground having a lot of spring water, that is, under the pressurized water, and there is a problem in the strength of the anchor.

On the other hand, the applicant of the present invention filed Japanese Patent Application No. 6-18.
No. 4545 provides a casing handling device for anchor construction under pressured water.

The proposed device is a packer for an inner swivel in which a drive shaft of a drilling machine is connected to one end of an adapter housed in an outer case equipped with a swivel socket and an air coupler, and a casing is connected to the other end. The feature is that the pressure hose of the packer is connected to the connecting rod.

[0005]

The above proposal is effective, but since the casing is rotated when the casing is pulled out, the pressing hose between the packer connecting rod and the packer is rotated by a rotating force ( There is a problem in that the space inside the pressure hose may be blocked due to the occurrence of twisting, and the stability of the supply of pressurized air to the packer is lacking.

The present invention relates to an improvement of the technique of the above-mentioned prior application of the present applicant, and provides an anchor building device under pressurized water capable of smoothly performing high-pressure air from the packer connecting rod to the packer. Is intended.

[0007]

An anchor building device under pressured water according to the present invention is a swivel consisting of an adapter and an outer case, and a driving part of a drilling machine is screwed on one side of the adapter. A screw hole into which the casing is screwed and an inner hole are formed on the other side, and an inner swivel is fixed to the inner hole. A packer connecting rod is provided in the hole, and a socket for water and grout material and an air coupler are fixedly provided in the outer case, the socket is communicated with the inner hole of the adapter, and the air coupler is the inner swivel. Of the rods connected to the packer connecting rod and the packer provided in the guide, the telescopic pipes are connected to each other. It is and rotatably configured telescopic mutually.

[0008]

In the anchor building device under pressured water configured as described above, it is possible to perform expansion and expansion and contraction by injecting water, grout material, air supply and exhaust, with the swivel attached to the casing. At this time, even if the casing is rotated with respect to the swivel or the swivel is expanded and contracted with respect to the casing, the relative movements of these components are smoothly absorbed through the telescopic pipe.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

2 to 4, an adapter 10 is fitted into an inner hole 2 of an outer case 1 of a swivel, which is designated by reference numeral A in its entirety. And the Teflon bearing 9a and the slide ring 9 by the bolts that connect the rings 12 and 12 together.
It is rotatably supported by being axially locked to the outer case 1 via b.

A screw hole 13 is provided on one side of the adapter 10.
And a screw hole 14 and an inner hole 15 are formed on the other side. The inner swivel 2 is provided in the inner hole 15.
0 is fixed.

A socket 3 and an air coupler 6 are attached to the outer periphery of the outer case 1. The socket 3 is in communication with an annular groove 5 formed in the inner hole 2 via a passage 4, and the air coupler 6 is in communication with an annular groove 8 via a passage 7.

On the other hand, the adapter 10 has a plurality of passages 16 communicating the annular groove 5 and the inner hole 15, the annular groove 8 and the inner hole 1.
A plurality of passages 17 communicating with the small diameter portion 15a of No. 5 are formed respectively.

An enlarged diameter portion 21a is formed in the passage 17 of the inner hole 21 of the inner swivel 20, and a Teflon bearing 22, a pressing ring 23 and a plurality of bolts 2 are provided on the other side.
4, the packer connecting rod 25 is rotatably accommodated.

Next, a mode of anchor construction using the swivel A and the water stop B, which is the premise of the present invention, will be described.

(1) Drilling machine set. The work floor is leveled flat and the drilling machine C (Fig. 5) is set at a predetermined angle.
The guide cell 40 of is set.

(2) Cutting of steel pipe sheet pile. The front surface of the steel pipe sheet pile D is cut by using gas in accordance with the anchor driving angle.

(3) Water stop plate attached. Water stop plate B for stopping water in the gap between the guide pipe 43 and the steel pipe sheet pile D
Is welded to the steel pipe sheet pile D.

(4) Driving the guide tube. Guide tube 43 with metal crown 44 and check valve 45
Then, cut the steel pipe sheet pile D, and further remove the earth and sand part E behind by 1.0.
Drive about m without water.

(5) Installation of a water-stop box. The water blocking box 46 is attached to the water blocking plate and bolted. The water stop box 46 prevents the outflow of earth and sand or ground water from the gap between the guide pipe 43 and the casing 47, and the water stop box 46 and the casing 47 are stopped by a rubber packing (not shown). Water.

(6) Drilling. Pressurized air is sent from the pressure hose 33 to expand the packer 32 and seal between the steel pipe sheet pile D and the guide pipe 43.
The drive shaft 42 of the drilling machine C is provided in one screw hole 13 of the swivel A.
The casing 47 is screwed into the other screw hole 14, and water is supplied from the socket 3 while drilling with the Kronen bit 48 with a check valve at the tip of the casing. The Kronen bit 48 is used to prevent groundwater and earth and sand from flowing out into the casing 47. In addition, the removal of drilling water and slime at the time of drilling is performed from the drain port 46 a of the water blocking box 46.

(7) Kronen bit cutting. When drilling is completed, insert a cutting jig (not shown) into the casing 4
7 and inserts it into 7 to cut the fixing pin (not shown) of the Kronen bit 48.

(8) Primary injection. The primary injection is performed by inserting an injection pipe (not shown) to the bottom of the hole.

(9) Insert tendon (FIG. 6). After the primary injection, the assembled tendon 49 is assembled into the casing 4
Insert in 7. The packer 50 is attached to the tendon 49 in advance so that the packer 50 fits inside the guide tube 43. The packer 50 is capable of coping with both the water stoppage of the gap between the casing 47 and the tendon and the gap between the guide tube 43 and the tendon 49.

In these devices, the feature of the present technology is that the packer 50 and the packer connecting rod 25 of the swivel A are communicated with each other by a telescopic pipe 51 as shown in FIG. Reference numeral 51 denotes rods 51a, 51b, 51c forming a telescopic pipe, which are rotatable and extendable with respect to each other as shown in FIGS.

(10) Casing extraction and pressure injection (FIG. 7). As the next operation, the casing 47 is pulled out while the grout material is processed and injected from the socket 3 of the swivel A.

(11) Cutting the casing (FIG. 8). The packer 50 is connected to the packer connecting rod 25 of the inner swivel 20 by the telescopic pipe 51, and when the casing 47 is pulled up to the connecting position, pressurized air is sent from the air coupler 6 of the swivel A to expand the packer 50 under pressure. In this state, the grout material F, water and earth and sand flowing back from the gap between the casing 47 and the tendon 49 when the casing is cut off are shut off.

(12) Packer shrinkage (FIG. 9). After collecting the casing 47, the grout material F is fed from the socket 3
Is injected under pressure and the packer 50 is contracted by decompressing from the air coupler 6. Then, step 11 and step 12 are repeated until the casing 47 goes over the packer 50.

(13) Final pressurization of packer (FIG. 10). When the casing 47 has passed the packer 50, the packer 50 is expanded under pressure. As a result, the gap between the guide tube 43 and the tendon 49 is stopped, and water and earth and sand are prevented from flowing back from the hole mouth.

(14) Oral water treatment. The water blocking box B is removed, and a water blocking material is injected into the upper portion of the packer 50.

(15) Curing. A curing period is provided until the grout material F reaches a predetermined strength.

(16) Tension fixation. After curing for a predetermined period of time, known tension fixation is performed.

[0033]

Since the present invention is configured as described above, the problems associated with the conventional pressure head can be solved and the casing can be pulled out with good workability.
Particularly, the packer connecting rod and the packer provided in the guide are communicated with each other by a telescopic pipe, and since the rods of the telescopic pipe are configured to be expandable and contractable with respect to each other, the packer connecting rod is Even if a rotational force (twist) is generated between the packer and the packer, there is no risk of blocking the space inside the telescopic pipe, so the supply of pressurized air to the packer is stable and smooth as a whole. An anchor building device with excellent workability can be provided.

[Brief description of drawings]

FIG. 1 is a side sectional view of a telescopic pipe.

FIG. 2 is a side sectional view of a swivel showing an embodiment of the present invention.

FIG. 3 is a side sectional view showing a guide tube driving step.

FIG. 4 is a side sectional view showing a water-stop box mounting step.

FIG. 5 is a side sectional view showing a hole making step.

FIG. 6 is a side sectional view showing a tendon insertion step.

FIG. 7 is a side sectional view showing a casing withdrawal and pressure injecting step.

FIG. 8 is a sectional side view showing a casing cutting step.

FIG. 9 is a side sectional view showing a packer contraction step.

FIG. 10 is a side sectional view showing a packer final step.

FIG. 11 is a side sectional view of the telescopic pipe at the time of contraction.

FIG. 12 is a side view of a partial cross section when the telescopic pipe is extended.

[Explanation of symbols]

 A ... Swivel B ... Water stop plate C ... Drilling machine D ... Steel pipe sheet pile E ... Sand and sand part F ... Ground material G ... Water stop material 1 ... Outer case 2 ... Inner hole 3 ... Socket 4, 7, 16, 17 ... Passage 5, 8, 11 ... Annular groove 6 ... Air coupler 9a, 22 ... Teflon bearing 9b ... Slide Ring 10 ... Adapter 12 ... Retaining ring 13, 14 ... Screw hole 15 ... Inner hole 20 ... Inner swivel 21 ... Inner hole 23 ... Presser ring 25 ... Packer connection Bolt 30 ... Main body 31 ... Large diameter part 32 ... Packer 33 ... Packer pressure hose 40 ... Guide cell 41 ... Drive part 42 ... Drive shaft 43 ... Guide tube 44 ... Metal crown 45 ... Check valve 46 ... Water stop Box 47 ... casing 48 ... Kronenburg bits 49 ... tendon 50 ... packer 51 ... telescopic pipes 51a, 51b, 51c ... rod

Claims (1)

[Claims] 1. A swivel comprising an adapter and an outer case, wherein one side of the adapter is formed with a screw hole into which a driving part of a drilling machine is screwed, and the other side is formed with a casing. A screw hole to be fitted and an inner hole are formed, and an inner swivel is fixed to the inner hole, a packer connecting rod is provided in the inner hole of the inner swivel, and the outer case is In the anchor building device, a socket for water and grout material and an air coupler are fixedly mounted, the socket is communicated with an inner hole of the adapter, and the air coupler is communicated with an inner hole of the inner swivel. And a packer provided in the guide are communicated with each other by a telescopic pipe, and each rod of the telescopic pipe is configured to be extendable and retractable with respect to each other. Characteristic anchor construction device under pressured water.