JPS6226367B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The disclosed technology belongs to the technical field of preventing backflow of filler and slime to the ground in the process of drawing out a drilled pipe in anchor work.

<Summary of the gist> The invention of this application provides an anchor construction in which a drilled pipe that penetrates into the ground through the attachment part to the wall surface is pulled out together with coagulant injection after the anchor body is inserted. This invention relates to a method and a device directly used therefor, and in particular, to prevent backflow of filler and slime by closing the shutter after the tip of the drilling pipe passes through the shutter at the proximal end of the sleeve pipe. This invention relates to an anchor construction method and an opening seal device for anchor construction having a soft shutter body used therein.

<Prior Art> As is well known, so-called anchor construction is widely used in various civil engineering and construction works to protect retaining walls, support earth pressure, etc.

Therefore, this type of anchor construction generally involves penetrating a drilled pipe with a pressure-receiving bit into the ground, connecting the strands of the inserted anchor body to the pressure-receiving bit, and filling the drilled pipe with a coagulating agent such as mortar. At the same time, the hole drilling pipe is pulled out.

When the raised part of the pipe is completely pulled out, there is a risk that the pressurized groundwater, slime, and filled coagulant will flow back and spout onto the ground, and there is a disadvantage that ground subsidence may occur due to water leakage.

<Problems to be solved by the invention> To date, measures have been taken to deal with this, such as hurriedly filling with rags, etc., or injecting an quick-setting agent, but the timing of these processes requires skill. In addition to this, there were other drawbacks, such as the fact that no reliable results could be expected.

<Objective of the Invention> The object of the invention of this application is to solve the problems of the anchor construction method based on the above-mentioned prior art as a technical problem, by providing a sleeve pipe in the wall mounting part in advance, and attaching a drilled pipe to the sleeve pipe to receive pressure. A bit is attached and inserted, and after drilling the ground, an anchor body such as a strand or steel rod is inserted, a shutter is attached and the pipe is pulled out while being filled with a pseudo-solid agent, and the shutter is closed at a predetermined location and the anchor body is inserted. This technique prevents slime, groundwater, and filler from flowing back to the ground, completes the mortar injection, and finally removes the shutter and guide pipe so that it can be used for the next stage of anchor construction. The measures were taken.

<Example> Next, an example of the present invention will be described below with reference to the drawings.

In Figures 1, 2, and 3, 1 is an opening sealing device for anchor installation, which constitutes one of the gist of the invention of this application, and a plate 2 as a disc-shaped bracket is used as a mounting part of a wall 3. belly rise part 4
A short pipe-shaped front guide tube 8 of the shutter 7 is removably screwed into a threaded portion 6 at the base of the sleeve tube 5, which is fixed to the sleeve tube 5 by suitable means such as a buried bolt (not shown) and inserted through the center thereof. ing.

Further, a short pipe-shaped upper guide tube 9 of the shutter 7 is provided concentrically with the guide tube 8, and a ring-shaped washer 11, seal rubber 12, 13, and packing 14 are installed around the threaded portion 10 of the shutter 7 inside. A seal tube 15 is removably screwed on.

As shown in FIGS. 2 and 3 in detail, the shutter 7 is attached to the guide tubes 8 and 9, and the rectangular hollow chamber 16 is attached to the opposing side plates 17 and 17 with a bolt 18 as an opening/closing device. , 18 through the weld nut 20, and the bolts 18, 1
A hard urethane foam 22 and a urethane elastomer 23 are disposed opposite to the pistons 21 and 21, and are housed inside to form a soft shutter body. are doing.

Note that a high-speed torque transmission device such as a motor (not shown) can be freely engaged with the outer end of the bolt 18.

Reference numeral 24 denotes a drilling pipe, which penetrates into the ground 25 by passing through the sleeve pipe 5, guide pipes 8, 9, and seal pipe 15, and at the time of penetration, a well-known drilling and pressure receiving bit (not shown) is connected to its tip. He was made to
Further, a large number of nylon check valve bristles 27 whose bases are fixed to a ring 26 are provided in a converging shape at the front thereof, and a rubber ring 28 is provided in a bundled manner at the front thereof.

A strand 29 is inserted through the pipe 24 as an anchor body of the tensile member, and its tip can be connected to a pressure receiving bit.

Note that 30 is a mortar injection hole, which is provided at the base of the sleeve pipe 5 and has a check valve (not shown).

In the structure of the above-mentioned anchor construction device, first, prior to construction, as shown in FIG. 2 is set, concrete is poured, and the sleeve pipe 5 is buried in the raised portion 4.

The plate 2 can also be designed so that the raised portion 4 is reinforced and fixed with bolts.

Next, after removing the formwork, the guide tube 8 is screwed onto the sleeve tube 5 via the threaded portion 6.
The shutter 7 is set, and then, as shown in FIG. 5, with the seal pipe 15 attached to the hole drilling pipe 24, a drilling and pressure receiving bit is engaged with the tip of the drilling pipe 24, and the shutter 7 and the guide are fitted. The tubes 8, 9 and sleeve tube 5 are inserted into the hole-drilling pipe 24, and a hole is drilled in the ground 23 by a known predetermined means.

During this time, the seal tube 15 is screwed onto the guide tube 9 via the threaded portion 10, and the outer surface of the drilled pipe 24 is sealed with the seal rubbers 12, 13 and the packing 14 to prevent slime build-up.

After drilling the hole to a predetermined depth, as shown in FIG. 6, the strand anchor body 29 is inserted into the drilling pipe 24 and engaged and fixed to the pressure receiving bit.
When this is completed, cement mortar or the like as a coagulant is press-fitted into the drilling pipe 24 and the drilling pipe is pulled out to form an anchor.

In this process, the anchor body 29 of the strand in the pipe 24 and the cement mortar are pushed in without any resistance due to the forward flow posture of the check valve bristles 27, and smoothly due to the opening of the rubber ring 28.

Further, in the process of pulling up the drilling pipe 24, as shown in FIG. 7, backflow of the filled cement mortar is checked by blocking the check valve bristles 27, and the anchor body 29 is also prevented from sliding up.

Then, when the tip of the drilling pipe 24 is pulled out and it is determined by a scale etc. that it has reached the top of the shutter 7 of the opening sealing device 1, the bolt 18 of the shutter 7 is tightened by an actuator such as a motor. By rapidly rotating in the closing direction, the pistons 21 and 21 move forward to face each other, and the urethane foam 22 and the urethane elastomer 23 gradually approach each other, and the strand anchor body 2
9 and supports it with clamping pressure.

In this state, the anchor body 29 is not necessarily located at the center of the drilling pipe 24, but the urethane foam 22, the urethane elastomer 23
The eccentricity is absorbed and clamped by the elasticity of.

When shutter 7 is closed in this way,
The front and rear of the shutter 7 are shut off, so that no backflow of the filling solid agent, slime, or groundwater occurs.

Therefore, the construction is completed by injecting mortar into the gap in the sleeve pipe 5 through the mortar injection hole 30 and opening the check valve, and after the mortar has solidified, the guide pipe 8 is removed from the sleeve pipe 5 through the threaded part 6. , used for the next stage of anchor construction, and attached to the plate 2 via a bracket or protruding sleeve pipe 5
The anchor body 29 is cut and removed, and a support member is appropriately provided to tension and support the anchor body 29.

It goes without saying that the embodiments of the invention of this application are not limited to the above-mentioned embodiments; for example, the anchor body is not limited to a strand, but may also be an anchor steel rod, and it is also possible to provide three or more soft shutters. In addition, the bracket can be of a hook type in addition to the plate, and various other configurations can be adopted, and there is no need for a raised bracket.

<Effects of the Invention> As described above, according to the invention of this application, in anchor construction, the hole-drilled pipe inserted into the sleeve pipe inserted into the wall mounting part is removed in the process of pulling out the hole-drilled pipe along with the injection of coagulant. After the tip of the tube passes through the shutter in the sleeve pipe, the front and back are shut off via the shutter, so that basically the filling coagulant accompanying the withdrawal of the drilling pipe,
Pressurized fluids such as groundwater and slime do not flow back and gush out onto the ground, and therefore, an excellent effect is achieved in that the borehole pipe can be pulled out and removed without requiring any skill.

In addition, since shut-off can be performed immediately and reliably by closing the shutter, removal of the drilled pipe after shut-off can be done stably without any particular hurry, and during this time there is no risk of contaminating the work environment with back-sprayed filler. Other excellent effects can also be achieved.

Furthermore, since the guide tube with a shutter is detachably attached to the sleeve tube via the bracket in the opening sealing device associated with anchor construction, the shutter closes when the drilled pipe is pulled, preventing the filling material from flowing backward. After preventing this, the shuttered guide tube can be disassembled and reused after filling with mortar is completed, and it also has the advantage that it can be easily reused as a set.

[Brief explanation of the drawing]

The drawings show an embodiment of the invention of this application, and FIG. 1 is an overall schematic partial sectional view, FIG. 2 is a partial sectional side view of the shutter, FIG. 3 is a partial sectional plan view of the shutter, and FIGS. , 6 and 7 are cross-sectional views of the construction process. 25...Ground, 24...Drilling pipe, 29...
Anchor body, 5... Sleeve tube, 7... Shutter, 2... Bracket, 8, 9... Guide tube, 2
2, 23...Shutter body.

Claims (1)

[Claims] 1. In the process of penetrating a borehole pipe into the ground and drilling a hole to a predetermined depth, inserting an anchor body and pulling out the borehole pipe while injecting a coagulant, the tip of the borehole pipe is A method for constructing an anchor, characterized in that when a portion of the sleeve pipe passes through a shutter and is pulled out, the shutter is closed to block the inside and outside of the sleeve pipe, and mortar is injected through the sleeve pipe. 2. In an opening sealing device used directly for anchor construction, a bracket fixed to a wall mounting part is fixed to a sleeve pipe inserted into the wall mounting part, and a guide pipe having a shutter is detachable from the base of the sleeve pipe. The anchor is adapted to be freely installed, and the shutter is provided with a pair of left and right soft shutter bodies that can move forward and backward across the guide tube and are linked to an opening/closing device. Construction sealing device.