JPH0726415Y2 - Water stop device for anchor - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The disclosed technology is used for constructing a high-rise building on a predetermined ground.
When the excavation root cutting part was formed in the ground that hits the foundation part,
To prevent collapse of the root cutting part due to earth pressure and groundwater discharge,
It belongs to the technical field of the structure of the water stop device for the casing pipe of the anchor when the anchor is provided on the inner surface of the root cut portion through the retaining wall in the ground at a predetermined inclination angle.

<Summary of summary> Thus, the invention of the present application is such that, when a high-rise building or the like is constructed on a predetermined ground, an excavation root cutting part is formed in the foundation part of the ground, and a water blocking box is formed on the retaining wall on the inner surface thereof. The seal ring is fixed to a seal ring made of rubber or the like that stops water from spouting slime or groundwater from the base of a casing pipe that penetrates into the ground through the retaining wall and prevents backflow jets. The present invention relates to a water stop device for an anchor having a screw-type forward / backward holder that is engaged to tighten a pipe, and in particular, a predetermined number of bolts along a circumferential direction of a holder that is loosely inserted into a casing pipe in advance to be mounted on the holder. Are integrally fixed and extended to be screwed into corresponding nuts provided on the apparatus frame, and the nuts are tightened to move the holder back and forth, and the holder moves forward and backward. According to the anchor water stop device, the ring ring is tightened to the casing pipe and the sealing action is surely performed, and the casing pipe and the holder need not be strictly concentric by a boring machine or the like. It is a device.

<Prior art> As is well known, when constructing a high-rise building on a predetermined ground or constructing a structure such as a steel tower on a slope, stability of the slope and collapse of the excavated root excavated in the ground due to earth pressure or In order to prevent the outflow of groundwater, anchors are pierced with a so-called earth retaining wall or retaining wall at an inclination of a certain angle with respect to the ground, and ground collapse or groundwater eruption occurs through the earth retaining wall or retaining wall. Blocking technology is widely adopted.

In this case, as shown in FIG. 5, for example, a root cutting portion 2 is excavated in the ground 1, a casing pipe 5 is installed on the inner side surface thereof through a pedestal 4 through a retaining wall 3, and a steel rod 6 or the like is inserted therethrough. Then, a mode is generally adopted in which a coagulating material 7 such as cement milk is injected into a fixing body (not shown) to form an anchor 8.

In such anchor work, casing pipes 5,5
Although it is relatively easy to perform the penetration driving into the ground 1 by the axial interconnection of the casing pipe 5 while the solidified material 7 is being injected through the casing pipe 5,
In order to pull out and remove the unit pipe of, the backflow jet into the root cutting part 2 due to the pressure of the injected solidified material or groundwater is generally seen. Therefore, while preventing this, the unit pipe of the casing pipe 5 It is relatively difficult to withdraw and withdraw in order, and therefore, for example, performing withdrawal and withdrawal via a mere check valve is problematic because of the cantilever of the casing pipe, etc. The unit pipe of the casing pipe 5 is pulled out and removed while injecting the coagulant through a double pipe system using a swivel joint and a tacker such as Japanese Patent Application No. 60-139149 (Japanese Patent Laid-Open No. 62-001924). The technology has been completed and made a great contribution to the anchor construction method.

<Problems to be solved by the invention> However, even in such an anchor construction method, groundwater is passed through the ring-shaped microclimb in the circumferential portion of each unit pipe of the casing pipe 5 which is made to penetrate through the pedestal 4 of the retaining wall 3. There was an inconvenience that the work environment was deteriorated due to the unavoidable springing out due to the pressure.

To cope with this, as shown in FIG. 4, a seal panel 9 is fixedly welded to the inside of the retaining wall 3 with respect to the ground 1, and the sealing panel 9 and the retaining wall 3 are welded to each other by means such as welding. It has become necessary to provide means for providing the seal box 10 in a hermetically sealed manner and providing a predetermined water stop device 11 at the base of the unit pipe 5'of the casing pipe 5.

Reference numeral 12 is a drain pipe for the base of the unit pipe 5'of the casing pipe.

As a concrete means of the water stop device 11, for example, as shown in FIG. 3, a seal made of rubber or the like is provided around the unit pipe 5'of the casing pipe 5 via a minute gap. A ring 13 is externally mounted on the unit pipe 5'so that it can be crimped and tightly sealed, and a taper surface 14 is formed on the outer peripheral surface thereof.
Ring-shaped tightening ring 15 with a tapered surface that matches 14
And engrave the screw 16 on the outer peripheral surface of the tightening ring 15,
By screwing a screw type forward / backward holder 18 having a knurl 17 on the outermost peripheral surface with respect to the screw 16 and rotating the screw type forward / backward holder 18,
The sealing ring 13 which is advanced and retracted by the taper surface 14 and is fitted to the unit pipe 5'of the casing pipe 5 is pressure-tightened to seal against slime and spring water.

Therefore, although there is the convenience that the seal ring 13 can be pressed against the unit pipe 5'through the advance / retreat of the tightening ring 15 only by the rotating action of the screw type advance / retreat holder 8, the following problems occur. was there.

That is, in order to perform the pressure-tight sealing of the seal ring 13 against the outer peripheral surface of the unit pipe 5 ', not only during the pressure-tightening but also the loose insertion state at the previous stage is concentrically centered. Despite being preferable, all of them are concentric due to drilling by a boring machine, penetration of the unit pipe 5'into the ground 1, or errors in the exterior of the seal ring 13 and the tightening ring 15 and in the assembling. Centering is extremely difficult, and as a result, there is an inconvenience that the pressure-sealing seal to the unit pipe 5 ′ by the seal ring 13 is biased, and a leak occurs while pressing. It was

Further, there is a negative point that the seal ring 13 is unevenly worn due to the repeated operation over time, and therefore, the leak cannot be avoided when the seal ring 13 is repeatedly used for a long period of time.

<Purpose of Invention> The purpose of the invention of this application is to insert the casing pipe into the ground through the retaining wall or the like of the unit pipe accompanying the anchor construction based on the above-mentioned prior art or to pull out the unit. The technical issues that should be solved are the backflow of slime from the peripheral edge of the pipe and the water stoppage against spring water, assuming errors in the centering of the boring machine and the manufacturing and assembly of the seal ring with respect to the ground of the unit pipe. Also, the forward and backward movements of the tightening ring through the tapered surface relative to the seal ring are translated to eliminate the inconvenience of the pressure seal due to the rotation in the axial direction. In the field of seal technology application in the construction industry, it is possible to reliably perform pressure clamping against the surface while maintaining the initial set concentric state. The purpose is to provide a superior water stop device for anchors.

<Means / Action for Solving the Problems> In order to solve the above-mentioned problems, the configuration of the invention of the present application, which has the above-mentioned utility model registration claim as its gist
When constructing a high-rise building on a specified ground or a steel tower on a ground slope, excavate a root cut part in the specified ground, construct an anchor at a specified inclination angle through a retaining wall, etc., and collapse the ground due to earth pressure In the construction to prevent the outflow of water and groundwater, in order to prevent the outflow of slime and groundwater from around the base of the unit pipe of the casing pipe penetrating into the ground through the retaining wall, loosely inserted into the peripheral surface of the base of the unit pipe. In order to press and tighten the seal ring to the unit pipe by the displacement of the tightening ring with respect to the seal ring, a screw type advance / retreat holder provided on the tightening ring is arranged and fixed in a ring shape around the holder. By rotating a predetermined number of bolts that are extended and extended substantially synchronously with the nuts provided on the device frame,
The bolts are advanced / retracted by the same amount, and the tightening ring is advanced / retracted in a parallel posture through the screw type advance / retract holder, and the sealing ring is attached to the peripheral edge of the unit pipe by the tightening ring. To prevent leaks of slime and spring water such as penetration and withdrawal of the unit pipe by surely performing a predetermined seal regardless of concentric centering during assembly of tightening ring and seal ring. It is a technical measure that makes it possible.

<Embodiment> An embodiment of the invention of this application will be described below with reference to FIGS.

It should be noted that parts that are the same as those in FIG. 3 and subsequent figures will be described using the same reference numerals.

The embodiment shown in FIG. 1 is a water stop device for an anchor which is the subject matter of the invention of this application. For the sake of illustration, the water stop box 10 shown in FIG. 4 is omitted, but the same as in FIG. It is assumed that the seal panel 9 and the water blocking box 10 for the retaining wall 3 for the excavated root cut portion 2 are provided.

Then, with respect to the base portion of the unit pipe of the casing pipe 5, three axial ring-shaped seal rings 13, 13, 13 have a taper surface 14 on the outer peripheral surface thereof in advance through a ring-shaped minute clearance. A tightening ring 15 'is provided on each seal ring 13 via a tapered surface 14 with a stopper at the tip, and a notch portion is provided for the ring-shaped tightening ring 15'. Screw type advance / retreat holder 1
8'is integrally provided in a ring shape.

A predetermined number of bolts 19, 19 ... Are integrally welded and fixed in a ring-shaped arrangement to the rear surface of the screw type advance / retract holder 18 'and extended, and the rear surface of the seal ring 13 is vulcanized. A frame 20 fixed integrally by processing is provided in a substantially L-shaped cross section and is screwed with a substantially bolt 19. A nut 21 is rotatably screwed to each bolt 19 on the outside of the frame 20. It is equipped.

In the above structure, when the unit pipe 5'of the casing pipe 5 penetrates into the ground through the retaining wall 3 or is pulled out and removed, slime, or
The spring tends to leak slightly, but by rotating each nut 21 and rotating it in a predetermined manner, the corresponding bolt 19 is tightened and the tightening ring 15 'with which the screw type holder 18' is engaged and fixed is moved forward and backward. Then, it is moved back and forth in a parallel movement state, and a seal ring 13 is provided through the taper surface 14 of the taper surface 14 to tightly press the outer peripheral surface of the unit pipe 5 '.

Then, at the end of the predetermined stroke, the stopper of the tightening ring 15 'stops the pressing.

By doing so, there was a discrepancy between the retaining wall 3 of the unit pipe 5'by the boring machine and the penetration into the ground 1 and the concentric centering at the time of manufacturing and assembling the seal ring 13 and the tightening ring 15 '. , The screw type advance / retreat holder 1 accompanying the advance / retreat of the corresponding bolt 15 by each nut 21
By the parallel movement of the 8'and the tightening ring 15 ', the seal ring 13 is surely secured to the unit pipe 5'with a tight crimp seal.

Therefore, the minute clearance around the unit pipe 5'is completely zero, and the slime and the leakage of spring water are surely prevented.

In the embodiment shown in FIG. 2, the seal ring 13 'is a single unit,
By omitting the tightening ring for the taper surface 14 of the seal ring 13 'and directly advancing the screw type advance / retreat holder 18 "and advancing / retreating by the nut (not shown) by the bolt 19, the seal ring 3'by the unit pipe 5'is moved. This is a mode in which a compression seal is provided, and there is substantially no difference in operation and effect from the above-described embodiment.

Needless to say, the embodiment of the invention of this application is not limited to the above-mentioned embodiments. For example, as for the seal ring, only a tightening ring through a tapered surface or a pressure tightening seal by a screw type advance / retreat holder is used. Instead, various modes such as a swivel type shutter of the camera can be adopted, such as performing a pressure seal for the unit pipe.

<Effect of device> As described above, according to the device of the present application, basically, a root cutting portion is formed by excavating in the ground when constructing a steel tower on a high-rise building or a slope, and a retaining wall on the inner surface thereof is formed. Anchor work to prevent collapse due to earth pressure and groundwater discharge by pouring a casing pipe through the earth retaining wall into the ground at a predetermined inclination angle and injecting solidified material such as cement mortar around the steel rod At the time of penetration or withdrawal of the unit pipe of the casing pipe through the injection of the solidified material in, the discharge of slime or groundwater through the minute clearance at the peripheral edge of the unit pipe into the ground of the unit pipe Even if the concentric centering during assembly of the boring machine, seal ring, screw type advance / retreat holder, tightening ring, etc. cannot be reliably removed when the The biased minute clearance caused by the overall rotation of the rudder is avoided, and the nuts are simply rotated with respect to the bolts by parallel movement of the screw type advance / retract holder itself and the tightening ring to crimp the seal ring against the peripheral surface of the unit pipe. The excellent effect that the tightening can be revealed and the reliable seal can be performed, so that the minute clearance is never formed, the slime, the groundwater, the minute leak, etc. do not occur, and the predetermined work in the ground can be surely performed. Is played.

Further, even when the above centering cannot be revealed even in the repeated sealing work, the tightening and crimping of the seal ring to the unit pipe is guaranteed each time even in the sealing work repeated over time. There is an advantage that uneven wear over time does not occur, therefore the function of the seal ring does not deteriorate, the device can be repeatedly used in anchor construction, and it is economically well worth it.

Moreover, since the work need only be tightened to the bolt by rotating the nut, no special skill is required, and the work can be performed safely.

Further, as described above, the concentric centering by the boring machine, the concentric centering at the time of manufacturing and assembling the seal ring, and the tightening ring are not necessarily required accurately, so that the preparation work is easy and the skill is not required. There are advantages.

[Brief description of drawings]

1 and 2 are explanatory views of an embodiment of the invention of this application,
FIG. 1 is a schematic enlarged partial sectional view of an essential part, FIG. 2 is a partial sectional view of an essential part of another embodiment, FIG. 3 is a partial sectional view of a water stop device for an anchor based on the prior art, and FIG. FIG. 5 is a partial sectional side view of a typical anchor water stop device, and FIG. 5 is a partial sectional view of anchor construction. 1 ... Ground, 2 ... Excavation root cutting part 3 ... Retaining wall, 5 ... Casing pipe 5 '... Unit pipe 10 ... Water-stop box, 13 ... Seal ring 14 ... Tapered surface, 15' ... Tightening ring 18 '... Screw type Forward / backward anchor

Claims (4)

[Scope of utility model registration request] 1. A screw type advancing / retreating holder which engages with a seal ring for a base portion of a casing pipe which is provided in a water-stop box fixed to a retaining wall on an inner surface of an excavated root of the ground and penetrates into the ground. In the water stop device for anchors, a predetermined number of bolts are integrally fixed and extended to a holder that is installed on a casing pipe, and are screwed into nuts provided on a frame. 2. The water stop device for an anchor according to claim 1, wherein the holder is linked to a tightening ring for the seal ring. 3. A water stop device for an anchor according to claim 2, wherein the tightening ring is taperedly engaged with the seal ring. 4. The water stop device for an anchor according to claim 1, wherein the seal ring is divided into a plurality of pieces in the axial direction.