JP3478480B2 - Construction management method in the impermeable sheet method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction management method in a water-blocking sheet construction method that is penetrated into the ground for the purpose of stopping water.

[0002]

2. Description of the Related Art This type of waterproof sheet construction method is disclosed in, for example, Japanese Patent Laid-Open No. 64-29518, which is made of a synthetic resin waterproof sheet (a flexible blocking plate of a predetermined length and Synonym) has one of a male part and a female part that can be engaged with each other on both sides in the lengthwise direction. The male part and the female part are penetrated while engaging with each other, and are sequentially connected and arranged in the width direction to form a continuous water stop wall in the vertical direction from the ground side. An example of application is a vertical stop wall for a waste facility that can contain industrial waste. In this case, not only is it applied when constructing a new disposal facility, but a new vertical stop wall may be added to the existing disposal facility for the purpose of maintenance.

FIG. 6 (a) schematically shows the state of penetration of a water blocking sheet when a continuous water blocking wall is constructed by such a water blocking sheet method. That is, in FIG.
Reference numerals 0A, 20B, and 20C denote water-impermeable sheets formed to have unit lengths, and each has a male portion 21 and a female portion 22 that are formed along both sides in the longitudinal direction and are engageable with each other. Then, between the water blocking sheet 20A and the water blocking sheet 20B, the female portion 22 of the water blocking sheet 20B engages with the male portion 21 of the water blocking sheet 20A as designed from the upper end to the lower end, and the connecting portion of both sheets is connected. The water impermeability in is maintained normally. The water blocking sheet 20C is connected to the water blocking sheet 20B and is in a state of being penetrated.

[0004]

In the above water-impermeable sheet construction method, the construction evaluation or reliability is still unsatisfactory from the following viewpoints. That is, FIG.
(B) schematically shows an example that is considered to occur in the water-impervious sheet construction method. The water-impervious sheet 20C is inserted while the male / female portions 21 and 22 are released from the middle of the penetration. Has been done. Such an abnormal situation is shown in FIG.
In the state of (a), there is a hard rock or stone obstacle 24 near the lower end of the water-impervious sheet 20C, and the lower end of the female portion 22 hits against it and is deformed by the local load to come off from the male portion 21. This is a rare case. The subsequent water-impervious sheet 20C is not engaged again in the process of being penetrated once the engagement of the lower end of the sheet is disengaged during penetration.
As shown in (b), the non-connecting portion 23 is formed between the preceding water blocking sheet 20B and the water blocking function cannot be maintained.

As the above conventional measures, the male / female portion 21,
The engagement of 22 is devised so that it is hard to be released due to its strength and shape, and the reinforcement prevents the forced deformation of the male / female portions 21 and 22 as in Japanese Utility Model Publication No. 7-35860 developed by the present applicants. And so on. However, each of these measures is merely an improvement from the engagement strength, and does not necessarily guarantee that the engagement state between the water-impermeable sheets is normally maintained. Further, under the present circumstances, for example, there is a strong demand to more objectively verify the reliability of construction in a vertical cutoff wall for a disposal facility. In the impermeable sheet construction method in which impermeable sheets are sequentially connected and laid on the surface of the earth, a system has been established that verifies damaged points and unconnected parts by measuring voltage and resistance on the front and back sides of the impermeable sheet. On the other hand, in the impermeable sheet method that penetrates underground,
In addition to deeply penetrating the impermeable sheet into the ground (for example, in units of several tens of meters), since the lower end side of the impermeable sheet is continuous in the ground, disconnection parts, etc. are measured by the voltage or resistance measurement. It is difficult to verify.

The present invention has been made in view of the above background. The purpose is to make it possible to more objectively verify whether or not the water-impermeable sheets are normally engaged in the water-impermeable sheet construction method that penetrates into the ground. To realize the method. Other purposes will be made clear in the following description.

[0007]

In order to achieve the above object, the present invention is directed to a water-blocking sheet which has one of a male part and a female part on both sides in the longitudinal direction, and which is an existing shield penetrated in the longitudinal direction of the ground. A water management sheet is a construction management method in the case of penetrating and connecting a subsequent water blocking sheet while engaging adjacent male and female parts, wherein the subsequent water blocking sheet is the existing water blocking sheet. When engaging with, the small preceding piece is previously engaged with the existing water-blocking sheet side, and the preceding piece is pushed down by the penetration of the subsequent water-blocking sheet and lowered along the existing water-blocking sheet. By measuring the amount of movement, it is possible to judge whether or not the engagement state of the subsequent water blocking sheet with respect to the existing water blocking sheet is normal.

In the above-described method of the present invention, the preceding piece is small in size so that it can be engaged with the male part or the female part of the water shield sheet. The verification principle of the present invention utilizes a phenomenon in which the preceding piece is pushed down by the subsequent water blocking sheet. That is, from the state in which the preceding piece is engaged with the existing water-blocking sheet side, by engaging the subsequent water-blocking sheet with the existing water-blocking sheet from above the preceding piece,
As long as the succeeding water-impervious sheet maintains the engaged state with the existing impermeable sheet, the preceding piece is pushed by the penetration of the succeeding impermeable sheet and lowered along the existing impermeable sheet. On the contrary, if the subsequent water blocking sheet is released from the engagement with the existing water blocking sheet during the penetration, it will be further penetrated into the ground, but it will be impossible to push down the preceding piece from the release point. Therefore, in the present invention, the movement amount of the preceding piece that is lowered by the penetration pressure of the succeeding water-impervious sheet is sequentially measured, and when the descending of the preceding piece stops during the penetration of the succeeding impermeable sheet, the relationship of the succeeding impermeable sheet is increased. If the descending movement amount of the preceding piece is as designed (corresponding to the designed penetrating movement amount of the subsequent impermeable sheet), it is determined that the engagement state of the succeeding impermeable sheet is normal.

Since the moving amount and the locus of the preceding piece can be measured by using a cord member or by detecting a signal, it is easy to manage and the principle is excellent in objectivity. That is, the movement amount and the locus of the preceding piece, for example, a string member such as a piano wire is connected to the preceding piece,
It can be known by a simple method such as measuring the length of the string member pulled from the ground side. In this case,
It is preferable to use a cord member which is pulled out from the winding drum and whose leading end is connected to the preceding piece, and is measured by the feed amount of the cord member. Such a method enables the reliability of the management method, prompt measures against an abnormal situation, and the like, and since the preceding piece can be collected by winding the string member, the same preceding piece is repeatedly used. It is excellent in terms of usage.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. This form example is a preferable basic example, but does not limit the technical scope of the present invention. In addition, FIG. 1 schematically shows the principle of the construction management method in the waterproof sheet construction method according to the present invention, and FIG. 2 shows A- of FIG.
FIG. 3 shows a section taken along line A, FIG. 3 shows an example of a preceding piece used in the method of the present invention, and FIG. 4 shows a modified example of the preceding piece.
FIG. 5 shows an example of a construction record (trajectory) obtained by construction management.

First, the water-blocking sheet construction method itself to which the method of the present invention is applied is performed in the same manner as the conventional method. That is, the required number of designing water-blocking sheets 1A, 1B, ... Are carried into the construction area, and a construction machine (for example, FIG.
A supporting leader 5 erected and supported by a base machine, etc., a penetrating machine such as a vibrator that is elevated and lowered along the supporting leader 5, and a guide frame for guiding the penetration of the water-impervious sheet) are carried in. . As the conventional penetration method, various methods are used in detail according to the hardness of the construction ground. As a typical example, when the water-impervious sheets 1A, 1B, etc. are directly penetrated from the surface side, when the water-impermeable sheets 1A, 1B, etc. are entrained and carried, or in the previous process, the ground of the underground penetration part is loosened. , There is a method of excavating the underground penetration part in advance and replacing it with self-hardening bentonite. The construction management method of the present invention may be any penetration method.

The water-blocking sheets 1A and 1B are made of a relatively hard synthetic resin molding (for example, a high-density polyethylene sheet having excellent chemical resistance and durability), and have the same shape and a predetermined length. Has been formed. As shown in FIG. 2, one of the convex male portion 2 and the concave female portion 3 is integrally formed at both ends of the sheet in the longitudinal direction. The male part 2 and the female part 3 have a structure capable of engaging with each other. Then, the male part 2 of the existing water-permeable sheet 1A that has penetrated in the longitudinal direction of the ground is carried into the ground while the female part 3 of the subsequent water-permeable sheet 1B is engaged, and the water-permeable sheet 1A, 1B is carried. Connect each other. In this case, the string-shaped sealing material 4 is arranged in the concave shape of the female portion 3, and the engaging portion between the male portion 2 and the female portion 3 is in a water-stop state by the sealing material 4.
The sealing material 4 is made of, for example, a water-swellable material, is inserted and arranged in a small concave portion provided in the female portion 3, and seals a gap generated between the sealing material 4 and the male portion 2. Further, in the water-blocking sheet construction method, for example, the actual fair 7-3586
The No. 0 reinforcing tool may be attached to the lower end side of the female portion 3.

In the construction management method of the present invention, for example, a small leading piece 6 as shown in FIG. 1 and a linear string member that accompanies the lowering of the leading piece 6 or raises and collects the leading piece 6. 9 and the winding drum 10 for the string members thereof are prepared.

Here, when the succeeding water-blocking sheet 1B is inserted while the female part 3 is engaged with the male part 2 of the existing water-blocking sheet 1A as shown in FIG. It has a shape similar to 3. On the base side of the preceding piece 6, a hole 6a through which the cord member 9 is inserted is formed in the front and back. Such a preceding piece 6 may be composed of only the portion forming the female portion 3 (or the male portion 2) in the case of engaging with the male portion 2 (or the female portion 3) of the existing water-blocking sheet 1A, You may attach an appropriate part to it. The material is metal, a hard resin material or the like, and it is preferable to reinforce the outside of the resin molded product 8a with a metal cover body 8b like the preceding piece 7 in FIG. Reference numeral 7a in the figure is a hole through which the string member 9 is inserted. The hole 6a and the hole 7a are the pull-out end 9a of the string member 9.
Is connected to the preceding pieces 6 and 7. Therefore, instead of the holes 6a and 7a, other locking portions such as protrusions and hooks may be used.

The cord member 9 is a piano wire, a fine wire, or the like, and is wound around the winding drum 10 so that it can be pulled out and wound up. The winding drum 10 can automatically pull out the string member 9 by a predetermined pulling force by the operation of the torque motor 11, and conversely, can wind up the string member 9 without causing unnecessary bending in the pulled-out portion. There is. Also,
A rotation detector 12 is connected to the rotary shaft of the rotary drum 10. The rotation detector 12 sequentially measures the pull-out amount of the string member 9 and sends the value to the arithmetic processing unit 14. The arithmetic processing unit 14 includes a recording unit 15, a display unit 16, and the like, and processes the current underground depth of the preceding piece 6 in a time series manner with respect to the feed amount of the string member 9 received from the rotation detection unit 12. Then, for example, it is oscilloscope-displayed on the recording unit 15 or digitally displayed on the display unit 16. In addition,
The winding drum 10, the torque motor 11, and the rotation detector 12 described above are provided in a unit state on the support plate 13, and are attached to, for example, the support leader 5 of the construction machine or a dedicated holding member.

Next, the procedure and the like of the construction management method of the present invention will be described in detail by taking an example of using the above equipment. In addition, this construction management method is, as shown in FIG. 1, a state in which the first waterproof sheet 1A is penetrated into the ground, and thereafter
It is applied when penetrating B etc. in order. That is, here, an example in which the succeeding water-impermeable sheet 1B is inserted into the existing water-impermeable sheet 1A, but after the water-impermeable sheet 1B is penetrated,
The same operation is performed on the next water-blocking sheet connected to the water-blocking sheet 1B.

According to this construction management method, the operator engages the preceding piece 6 with the male portion 2 of the existing water blocking sheet 1A before the water blocking sheet 1B is inserted along the existing water blocking sheet 1A. The point is added to the conventional operation. That is, the preceding piece 6 is connected to the pull-out end 9a of the string member 9 wound around the winding drum 10, and is suspended from the string member 9 as shown in FIG. The engagement operation is performed on the upper side of the portion 2. After that, the subsequent water-impervious sheet 1B is engaged with the existing water-impervious sheet 1A (the male portion 2 is engaged with the female portion 3) from above the preceding piece 6 in the same manner as in the conventional case. become. Then, the preceding piece 6 is pressed by the lower end of the subsequent water-impervious sheet 1B due to the penetration of the subsequent water-impervious sheet 1B, and is lowered along with the subsequent water-impervious sheet 1B along the existing water-impervious sheet 1A. At this time, the preceding piece 6
The amount of downward movement of is measured as the amount of feeding of the string member 9 by the rotation detection unit 12, converted into the in-situ depth of the preceding piece 6 by the calculation processing unit 14, and stored in time series.

By the way, the lowering of the preceding piece 6 maintains the engagement of the existing waterproof sheet 1A (engagement of the male and female portions 2 and 3) with the subsequent waterproof sheet 1B in the penetration process, and Is continued in principle until it is pushed out from the lower end of the existing water-impervious sheet 1A (the one-dot chain line in Fig. 1 shows the final penetration state of the subsequent water-impervious sheet 1B). On the other hand, the preceding piece 6 is engaged with the existing impermeable sheet 1A while the succeeding impermeable sheet 1B is being penetrated (engagement of the male / female portions 2 and 3).
If it is forcibly released by an obstacle or the like, it will not descend because it is not pressed by the subsequent water-impervious sheet 1B (the two-dot chain line in FIG. 1 further penetrates from the disengagement of the subsequent water-impermeable sheet 1B). Has been shown). This is the same when the preceding piece 6 is disengaged from the existing water blocking sheet 1A. The above four cases can be summarized as follows. In the case 1, both the preceding piece 6 and the subsequent water blocking sheet 1B are normally engaged. The case 2 has the preceding piece 6 engaged and the subsequent water-blocking sheet 1B disengaged. , The leading piece 6 is disengaged from the case 3, and the subsequent water blocking sheet 1B is engaged with the case 3. The case 4 is disengaged from both the preceding piece 6 and the subsequent water blocking sheet 1B.

In the judgment of the construction management method of the present invention, only the above case is judged to be normal and the above steps are judged to be abnormal. In the above case, this is expressed as a continuous normal trajectory until the descending movement amount of the preceding piece 6 reaches the design penetration depth from the ground surface (GL = 0) as shown in (a) of FIG. 5, for example. It will be.
On the contrary, in the case of the above, the preceding piece 6 is not normally pressed by the succeeding water-blocking sheet 1B, and as a result, the descending movement amount is not descended at all from the time of occurrence of an abnormality as shown in (b) of FIG. 5, for example. Or, it is represented as an abnormal locus in which the descent is rapidly decelerated as shown in (c). here,
In FIGS. 5A, 5B, and 5C, reference numeral H1 is a piece descending locus when the preceding piece 6 is being pressed by the succeeding water-impervious sheet 1B and is penetrated, and reference numeral H2 is forcibly the rotating drum 10. It is a piece rising locus for reversing and winding up the string member 9 to collect the preceding piece 6. The reference sign S1 is a sheet descending locus when the succeeding water impervious sheet 1B penetrates, and the sign S2 is a sheet ascending trajectory for pulling up the succeeding impervious sheet 1B again due to the above-described abnormality. This sheet raising operation is performed at the stage when the abnormality of the piece descending locus H1 of FIGS. 5B and 5C is detected. In addition, in the arithmetic processing unit 14, an alarm sound is generated based on the abnormality of the piece descending locus H1, and the worker detects an abnormal situation by the alarm sound and stops the penetration operation of the subsequent water-blocking sheet 1B at an early stage. It is possible to deal with it.

By the way, in the past, the sheet descending locus S1 at the time of penetration of the succeeding water impervious sheet 1B was sometimes obtained, but with this alone, even if the engagement with the existing impermeable sheet 1A is released, the continuous locus is obtained. Therefore, it is impossible to judge whether it is normal or not. This point can be easily and simply verified by simply sequentially measuring the descending movement amount and descending locus of the preceding piece 6 by the rotation detecting unit 12 or the like as in the method of the present invention. That is, in terms of construction management, when the lowering of the preceding piece 6 stops during the penetration of the subsequent water blocking sheet 1B as described above ((FIG.
When it is determined that the engagement is disengaged on the abnormal loci of (b) and (c), and the downward movement amount of the preceding piece 6 is as designed (FIG. 5).
This is because it is possible to determine that the engagement state of the succeeding water-impervious sheet 1B is normal to the (normal trajectory of (a)). In such a construction management method, since an abnormal situation is detected in the penetration process, a correction operation can be performed quickly, and the penetration construction history of each water-impervious sheet used can be recorded and stored in the recording unit 14, and the preceding piece 6
Also has an action of dropping mud and the like adhering to the male portion 2 of the existing water-impervious sheet 1A, so that the subsequent water-impervious sheet 1B or the like is ideally engaged (the female portion 3 is engaged with the cleaned male portion 2). It will be excellent in terms of things.

The method of the present invention is not limited to this embodiment except for the technical elements described in the claims, and may be appropriately changed according to the material and length of the water-blocking sheet, the construction scale, etc. Is. Further, it is needless to say that the rotary drum 10, the detection unit 12, the arithmetic processing unit 14, and the like can be appropriately improved so as to better match the actual work.

[0023]

As described above, the construction management method in the water-blocking sheet construction method according to the present invention has the following advantages. Firstly, it is objective because it uses the phenomenon that the preceding piece is pushed down by the succeeding impermeable sheet and descends.
Since the movement amount and the locus of the preceding piece can be easily measured by a string member or the like, it becomes easy and easy to understand in terms of management. In addition, since it is possible to record and store the intrusion construction history of the used waterproof sheet, it is possible to improve the reliability of this type of waterproof sheet construction method. Secondly, when the movement amount or trajectory of the preceding piece deviates from the design value, the penetrating operation of the subsequent water blocking sheet can be stopped at that point, and it becomes possible to deal with it, so an abnormal situation can be detected at a faster stage. It is possible to eliminate useless penetrating operation. Therefore, the construction efficiency or the construction period can be maintained more accurately. Thirdly, the movement amount and the locus of the preceding piece are determined by, for example, using a cord member that is pulled out from the winding drum and has its leading end connected to the preceding piece, according to the feeding amount of the cord member. It is also possible to measure. Therefore, in terms of management, the operation is simple, the construction efficiency is not deteriorated, and the preceding pieces are easily collected and repeatedly used, so that rational management and construction can be performed.

[Brief description of drawings]

FIG. 1 is a configuration diagram schematically showing the principle of the method of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a view showing an example of a preceding piece used in the present invention together with a water blocking sheet.

FIG. 4 is a schematic cross-sectional view showing another example of the preceding piece.

FIG. 5 is a diagram showing an example of a case where the construction management method of the present invention is graphed.

FIG. 6 is a schematic diagram for explaining an abnormal situation of a conventional water-blocking sheet construction method.

[Explanation of symbols]

1A is an existing impermeable sheet (impermeable sheet) 1B is the subsequent impermeable sheet (impermeable sheet) 2 is male 3 is the female part 6 and 7 are leading pieces 9 is a string member 10 is a rotating drum

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) E02D 5/20 102 E02D 19/12

Claims (3)

(57) [Claims] 1. A water-impervious sheet has one of a male part and a female part on both sides in the longitudinal direction, and a succeeding impermeable sheet is adjacent to an existing water-impervious sheet penetrating in the longitudinal direction of the ground. It is a construction management method in the case of penetrating and connecting while engaging a male part and a female part, in engaging the subsequent water blocking sheet with the existing water blocking sheet, a small preceding piece is previously installed. By measuring the amount of movement of the preceding piece that has been engaged with the water-blocking sheet side and is pushed down by the penetration of the subsequent water-blocking sheet and lowered along the existing water-blocking sheet, A construction management method in a water-blocking sheet construction method, comprising determining whether or not a subsequent water-blocking sheet is engaged normally. 2. The moving amount of the preceding piece is measured by the feeding amount of the cord member by using a cord member which is pulled out from a winding drum and whose leading end is connected to the preceding piece. Construction control method for the water-blocking sheet described. 3. The construction management of the water blocking sheet according to claim 2, wherein the preceding piece is recovered by being pushed out from a lower end of an existing water blocking sheet and then wound up with a string member through the winding drum. Method.