JPH0718163B2 - Anchor construction method and pedestal waterproofing box for anchor construction method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method of constructing an anchor formed in the ground for holding a retaining wall or the like, and a pedestal and water-stop box used therefor.

[Conventional technology]

As is well known, the so-called anchor construction method is adopted for holding earth retaining walls and retaining walls in construction work.In this anchor construction method, a casing pipe is driven into the ground for a predetermined length from the outside of the earth retaining wall and the casing pipe An anchor steel material with a steel wire or a steel rod is inserted into the inside, and a solidifying material is press-filled and the casing pipe is pulled out, and then the tense anchor steel material end is fixed to a pedestal outside the earth retaining wall.

At the time of drilling with this casing pipe, groundwater and excavation drift will rise along the casing pipe, so it is possible to install a water stop box outside the earth retaining wall to stop water between the casing pipe and earth retaining wall. is there.

[Problems to be Solved by the Invention]

However, the conventional water-stop box is used only for water-stop, and when the anchor steel material was fixed, it was removed and replaced with a pedestal.

Therefore, water often came out during the refilling work.

Further, when pulling out the casing pipe, it is necessary to inject the water stopping chemical into the opening (mouth) to stop the water.

Figure 26 shows an example of this, the casing pipe 13 is the final one of the unit pipe connections, and the casing
A steel wire 25 as an anchor steel material is inserted into the hole after the removal of 13 and is filled with cement milk. In the figure, 36 is a water shut-off box, and 29 is a casing prepender.

As shown in FIG. 26, the casing pipe 13 is LW (water glass + water glass +
When the cement suspension) is injected, the chemical solution 31 is solidified in the casing pipe 13 and the steel wire 25 rises together when the casing pipe 13 is pulled out.

The object of the present invention is to eliminate the inconvenience of the conventional example, and since the water blocking box can also be used as a pedestal when fixing the anchor steel material, refilling work is unnecessary, and further, the water blocking chemical is injected using this water blocking box. Accordingly, it is an object of the present invention to provide an anchor construction method and a pedestal and water-stop box for the anchor construction method, which can prevent coagulation of the chemical liquid in the casing pipe and prevent the anchor steel material from rising together when the casing pipe is pulled out.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention, as a pedestal and water blocking box for an anchor construction method, has a vertical open surface that is welded to a joining plate buried in the outer surface of a retaining wall and stands up from the joining plate. A swash plate with a casing pipe insertion hole is placed on one side of each of the substantially triangular left and right side wall plates, and the swash plate provided between the side wall plates so that their ends are orthogonal to each other has a swash plate for removing water and sand. The main purpose is to form a discharge port for the chemical solution and an injection port for injecting the chemical solution.The anchor construction method using this pedestal and water blocking box is a casing pipe insertion hole and a drainage port for removing water and sand. The exit,
A pedestal water-stop box with an injection port for chemical injection is attached to the outside of the earth retaining wall, and a casing pipe having a bit at the tip and sequentially connecting unit pipes is drilled through the casing pipe insertion hole. The drilling scraps that have been driven into the ground for a specified length with the casing pipe and rise during drilling are stored in a water valve that also serves as a pedestal, and the water is discharged to the outside while adjusting the amount of water at the discharge port. Anchor steel material with steel rod is inserted, and the casing pipe is pulled out while press-fitting the solidifying material.Before pulling out the final unit pipe and the unit pipe of the preceding stage, the casing pipe is closed with a waterproof packer and also serves as a pedestal. Water is injected from the water injection port of the water shut-off box to stop water, and then all casing pipes are pulled out. Are those by tensioning the anchor steel end and summarized in that for fixing the base serves waterproofing box.

[Action]

According to the present invention, the pedestal-cum-water-stop box further serves as a box for discharging excavation chips rising along the casing pipe during drilling, and as a pedestal for tensioning and fixing the anchor steel end portion. It can be used as a box for injecting chemicals for water and enables rational construction of anchors.

〔Example〕

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 to 12 are side views of respective steps showing an embodiment of the anchoring method of the present invention, in which 1 is a retaining wall.

As shown in FIG. 1, a sleeve pipe 2 is embedded in the earth retaining wall 1 in advance, and a pedestal / water-stop box 3 is attached to the outside of the earth retaining wall 1 so as to be joined to the sleeve pipe 2.

FIG. 13 and FIG. 14 show an embodiment of the pedestal and water blocking box 3 of the present invention, in which a joining plate 4 is embedded on the outer surface of the earth retaining wall 1 on the outer circumference of the sleeve tube 2.

The pedestal / water-stop box 3 is provided with right and left side wall plates 6a, 6b of substantially triangular shape which are erected so as to form a vertical open surface 5 to be welded to the joining plate 4, and the left and right side wall plates 6a, 6b are provided on one side thereof. , The swash plate 7 in the direction orthogonal to the sleeve pipe 2
The swash plate 7 is formed with a casing pipe insertion hole 8 for penetrating a casing pipe 13 described later.

The axial direction of the insertion hole 8 coincides with that of the sleeve tube 2.

Further, the side wall plates 6a and 6a,
A swash plate 9 was provided between b, and a discharge port 10 for removing water and debris and an injection port 11 for injecting a chemical solution were formed in this swash plate 9.

The open surface 5 is formed by being surrounded by the ends of the left and right side wall plates 6a and 6b, the end of the swash plate 9 and the end of the horizontal plate joined to the swash plate 7.

Also, in actual use, a fitting with a valve or the like is attached to the outlet 10 and the inlet 11.

As shown in FIG. 2, the casing pipe 13 set in the hole drilling machine 12 is inserted into the ground through the casing pipe insertion hole 8 of the pedestal-and-water-stop box 3 and the sleeve pipe 2 to drill a hole.

20 and 21 show the details of the tip portion of the casing pipe 13, the ring bit 14 in which the drilling blades 14a are arranged in a ring shape is attached to the inside of the tip portion of the casing pipe 13 by screwing.

Then, the Kronen bit 15 was fitted in the ring bit 14, and the ring bit 14 and the Kronen bit 15 were joined together by the pin 16 through the respective insertion holes. This pin 16
Is capable of being cut by striking as described later.

Further, the clonen bit 15 has a conical tip end surface on which the excavating blade 14a is formed, but a water passage hole 17 opening at the tip end surface is formed inside, and a ball valve is formed in the water passage hole 17. Built-in check valve 18 by.

The check valve 18 is biased by a spring 19 in the direction opposite to the front end surface of the Kronen bit 15.

Furthermore, a sleeve tube 20 is formed at the root of the Kronen bit 15, and this sleeve tube 20 is inside the ring bit 14
The end portion projects outside the ring bit 14 when the 15 is fitted, and an O-ring 21 is fitted on the outer periphery thereof.

For drilling with the casing pipe 13 having both the bit of the ring bit 14 and the bit of the Kronen bit 15 at its tip, the drilling machine 12 can add rotation, striking, and vertical movement.

Further, as shown in FIG. 15, water is fed into the casing pipe 13 at the time of drilling, and this water is supplied to the water passage holes of the Kronen bit 15.
Discharge from the tip through 17 which facilitates drilling.

It should be noted that the casing pipe 13 is appropriately added by a unit pipe to have a predetermined length. At the time of this addition, the rotation, striking, vertical movement of the casing pipe 13 and water supply are stopped.

In that case, even if groundwater or earth and sand tries to enter the casing pipe 13 through the water passage hole 17, the check valve 18 is closed as shown in FIG. 16, so that backflow can be prevented.

In addition, since the mouth pre-bender 22 is interposed between the casing pipe 13 and the casing pipe insertion hole 8 of the pedestal water-stop box 3 to make it watertight, excess water and drilling scraps rising along the outer periphery of the casing pipe 13 are prevented. It collects in the pedestal and water blocking box 3 and does not come out from the outer periphery of the casing pipe 13.

Excavations in the water-stopping box 3 that also serves as a pedestal are drained.
Adjust the amount of water at 10 and discharge to the outside.

Furthermore, when the casing pipe 13 is completely inserted into the ground for a predetermined length and rotation, striking, vertical movement, or water supply is stopped,
Since the check valve 18 is closed, it is possible to prevent the backflow of groundwater and sediment.

Then, as shown in FIG. 3 and FIG. 17, the inner rod
23 is inserted into the casing pipe 13, and the boring machine 12 strikes the Kronen bit 15 through the inner rod 23 to cut the pin 16.

In this case, as shown in FIG. 18, the Kronen bit 15 advances a little, but the O-ring is placed between the sleeve tube 20 and the ring bit 14.
There are 21, so the water is stopped during that time.

After that, as shown in FIG. 4, the casing pull-out jack 24 is set in the pedestal / water-stop box 3, and then cement milk is primarily injected into the casing pipe 13,
As shown in the figure, a steel wire 25 as an anchor steel material is inserted into the casing pipe 13.

At this time, if the casing pipe 13 is pulled out by the casing pull-out jack 24 while pressing the Kronen bit 15 with the tip of the steel wire 25, the Kronen bit 15 will disengage from the ring bit 14 as shown in FIG. Remain in.

When pulling out the casing pipe 13, it is necessary to close the root portion of the casing pipe 13.

22 and 23 show the water blocking packer 26 for such blockage, the water blocking packer 26 is a lump of elastic synthetic rubber or synthetic resin.

A rod 27 is constituted by the outer pipe 27a and an inner rod 27b whose root portion is screwed to the outer pipe 27a and whose tip projects from the tip of the outer pipe 27a, and a collar plate 28a is formed at the tip of the inner rod 27b. A collar plate 28b is provided at the tip of the outer pipe 27a, and the water blocking packer 26 having the inner rod 27b penetrating the center thereof is installed between the collar plate 28a and the collar plate 28b.

Then, when inserting the rod 27 into the casing pipe 13, the casing pre-bender 29 is attached to the root end of the casing pipe 13, and the rod 27 is inserted so as to penetrate the casing pre-bender 29.

Further, a rotating portion 30 having an insertion hole 30a such as a jig is provided at the root of the inner rod 27b.

As shown in FIG. 22, when the inner rod 27b is rotated through the rotating portion 30, the inner rod 27b moves with respect to the outer pipe 27a and the collar plate 28a.
And the collar plate 28b are shortened, and the water blocking packer 26 is crushed by the collar plates 28a and 28b and expanded outward to close the casing pipe 13.

Further, if the inner rod 27b is rotated in the opposite direction via the rotating portion 30, the gap between the collar plate 28a and the collar plate 28b is opened as shown in FIG. 23, the water blocking packer 26 is contracted, and the casing. It is not in contact with the inside of the pipe 13.

By the way, if the water pressure received by the water stop packer 26 at the time of expansion is high, the water stop packer 26 may move, so the end of the inner rod 27b and the earth retaining wall 1 are connected by the wire 32. Try to exert a reaction force on the wall 1.

The wire 32 connects the hole-in anchor provided on the earth retaining wall 1 and the insertion hole 30a of the rotating portion 30 of the inner rod 27b.

As described above, the casing pipe 13 has a predetermined length by adding unit pipes, and the casing pipes 13 are sequentially pulled out while removing the unit pipes one by one.

The procedure for pulling out the casing pipe 13 is as follows.

The casing pre-bender 29 is set at the base end of the casing pipe 13, the water blocking packer 26 is inserted into the casing pipe 13, and the casing pipe 13 is pulled out by the casing pulling jack 24.

At this time, the water stop packer 26 is not expanded and only the casing pre-bender 26 prevents backflow of the cement milk.

After pulling out the casing pipe 13, pressure injection of cement milk is carried out.

At the time when the water blocking packer 26 is inserted from the joint between the last unit pipe of the casing pipe 13 and the unit pipe of the preceding stage, the water blocking packer 26 is expanded to close the inside of the casing pipe 13, and the casing Remove the pre-bender 29 and the last unit pipe.

In this state, the water stop packer 26 prevents backflow.

The removed casing pre-bender 29 is attached to the rearmost end of the casing pipe 13 again, and the water blocking packer 26 is contracted.

Hereinafter, the steps 1 to 3 are repeated by the number of unit pipes.

FIG. 6 shows a state where the cement milk is injected under pressure, and FIG. 7 shows a state where the casing is separated and a water-stopper packer 26 is activated.

As shown in FIG. 8 and FIG. 24, before drawing out the final unit pipe and the unit pipe of the preceding stage, from the injection port 11 for injecting the liquid chemical of the pedestal / water shutoff box 3, the water stopping liquid 31
As LW (water glass + cement suspension) is injected.

At this time, the water stop packer 26 is inflated in the unit pipe of the preceding stage (the last unit pipe).

Since there is cement milk in the casing pipe 13 consisting of the final unit pipe and the unit pipe of the preceding stage, the water-stopping chemical solution 31 does not rotate.

After stopping the water in this way, the final casing (unit pipe) is removed as shown in FIG. 25. As shown in FIG.
Set the cloth packer 33 in a place that is a little deep from
The water-stopping chemical liquid 31 is injected into the cloth packer 33 to inflate it to stop the water.

In addition, cement milk is re-injected from a grout hose (not shown) attached to the steel wire 25 in order to increase the reliability of the fixing portion.

After this, the final casing (unit pipe) is removed, and as shown in FIG. 10, the tension jack 34 is set on the pedestal and water blocking box 3 to tension and fix the steel wire 25 after curing.

Then, as shown in FIG. 11, the steel wire 25 is cut, and as shown in FIG. 12, the protective cap 25 is attached as a final step, or the water-stopping chemical solution 31 is injected again into the pedestal / water-stop box 3. The anchor head is then treated with water to complete the construction.

〔The invention's effect〕

As described above, the water-stop box of the present invention can also be used as a pedestal when fixing the anchor steel material, so refilling work is unnecessary, and by further injecting the water-stopping chemical liquid using this water-stop box, the inside of the casing pipe It is possible to avoid the coagulation of the chemical liquid in the above, and to prevent the anchor steel material from rising together when the casing pipe is pulled out.

[Brief description of drawings]

1 to 12 are side views of respective steps showing one embodiment of the anchor construction method of the present invention, FIG. 13 is a front view of a pedestal and water blocking box of the present invention, and FIG. 14 is A of FIG. -Cross section of line A, 15th
Fig. 19 to Fig. 19 are side views of each step showing the state of the bit at the tip of the casing pipe, Fig. 20 is a longitudinal side view of the casing pipe tip, Fig. 21 is the same as the above front view, and Fig. 22 is the expansion of the water blocking packer. FIG. 23 is a side view showing the time, FIG. 23 is a side view showing the same time when contracted, FIG. 24 is a side view showing the step before the final step when drawing the casing pipe, and FIG. 25 is the final step when drawing the casing pipe. FIG. 26 is a side view showing a conventional example. 1 …… Soil retaining wall 2 …… Sleeve tube 3 …… Stand-stop water box 4 …… Joining plate 5 …… Opening surface 6a, 6b …… Sidewall plate, 7,9 …… Swash plate 8 …… Casing Pipe insertion hole 10 …… Discharge port, 11 …… Injection port 12 …… Driller, 13 …… Casing pipe 14 …… Ring bit, 14a …… Drilling blade 15 …… Kronen bit, 15a …… Drilling blade 16 ...... Pin, 17 …… Water hole 18 …… Check valve, 19 …… Spring 20 …… Sleeve tube, 21 …… O ring 22 …… Mouth pre-bender, 23 …… Inner rod 24 …… Casing extraction jack 25 …… Steel wire, 26 …… Still water packer 27 …… Rod, 27a …… Outer pipe 27b …… Inner rod, 28a, 28b …… Crim plate 29 …… Casing pre-bender 30 …… Rotating part, 30a …… Insertion hole 31 …… Water-stopping chemical liquid, 32 …… Wire 33 …… Cloth packer, 34 …… Tension jack 35 …… Protective cap, 36 …… Waterproof box

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Masayuki Komaki 1-6-4 Moto-Akasaka, Minato-ku, Tokyo Within Chemical Grout Co., Ltd. (72) 1-6-6 Moto-Akasaka, Minato-ku, Tokyo Issue Chemikaru Grout Co., Ltd. Examiner Kaname Ichino

Claims (2)

[Claims] 1. A pedestal / water-stop box having a casing pipe insertion hole, an outlet for removing water and sand, and an inlet for injecting a chemical solution is attached to the outside of the earth retaining wall, and has a bit at the tip, and a unit is provided. A casing pipe made by sequentially connecting pipes is driven into the ground for a predetermined length with a drilling hole machine through the casing pipe insertion hole, and excavation chips that rise up along the casing pipe during drilling are collected in the pedestal and water-stop box. While adjusting the amount of water at the discharge port, discharge it to the outside, insert the anchor steel material by steel wire or steel rod into the casing pipe, pull out the casing pipe while press-fitting the solidifying material, and pull out the final unit pipe and its pre-stage. Before pulling out the unit pipe of, while closing the inside of the casing pipe with the water blocking packer, stop it from the injection port for chemical liquid injection of the pedestal and water blocking box. Performs waterproofing the use liquid injection to, Anchorages, characterized in that subsequent pulling all the casing pipe, thereby pedestal combined water stop box fixing by tensioning the anchor steel end. 2. A casing pipe insertion hole is formed on each side of a substantially triangular left and right side wall plate having a vertical open surface that is welded to a joining plate buried in the outer side surface of the retaining wall and rises from the joining plate. The swash plate which was crossed over, and the swash plate provided between the side wall plates so that the end portion is orthogonal to the swash plate was formed with an outlet for removing water and debris and an inlet for injecting a chemical solution. A water base box that also serves as a pedestal for the anchor construction method.