JPS63289122A - Construction of cut-off wall - Google Patents

Abstract

PURPOSE:To simplify the construction work of cut-off walls by a method in which a water-stop sheet is set in an excavated pit for preceding element, a solidifying agent is placed, a water-stop sheet is also set in an excavated pit for following element, and both elements are connected to each other. CONSTITUTION:A water-stop sheet 6 having bonding parts 7a on its left and right-handed ends is set with a guide metal 5 in an excavated pit 3 for preceding element, and the ends 6 of the sheet are protected by coupler metals 4. A solidifying agent 20, e.g., concrete, is placed into the pit 3. An excavated pit 13 for following element is then formed, metals 4 are removed, and a water-stop sheet 6 having bonding parts 7b on its left and right-handed ends are hung down into the pit 13 by unwinding the sheet 6. The sheets 6 for preceding elements are connected at the bonding parts 7a and 7b, the guide metal 5 is removed, and the agent 20 is placed into the pit 13 to form a continuous cut-off wall with both elements 6 and 14. The construction work can thus be attained economically without the need for reinforcing bars.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for constructing a water-stop wall in building foundation work or civil engineering work.

[Conventional technology and its problems]

Water cutoff walls are often made of ordinary continuous underground walls, which, as is well known, are constructed by building a reinforcing cage in a horizontally long excavated hole and pouring concrete to create a continuous reinforced concrete panel underground. Such a continuous underground wall takes time and effort to construct, and is economically expensive because it uses a large amount of concrete and reinforcing steel, and is expensive unless a strong earth retaining structure is required.

Moreover, reliable water stoppage cannot often be expected due to the occurrence of cranks in concrete panels, corrosion of reinforcing bars, and difficulty in treating water leakage at joints between walls.

In addition, earth and sand generated by excavating the site may be mixed with cement and other materials to form water-stop walls for fill mortar, but this method cannot be expected to provide a reliable water stop.

Therefore, if the purpose is only to stop the water, it may be possible to form a water-stop membrane using a waterproof material underground and use this to stop the water. For example, in the method disclosed in Japanese Patent Publication No. 62-2084, a waterproof sheet with a width equal to the depth of an excavated trench is placed in a roll on a special trolley, and the tip of the prevention sheet is pulled out and inserted into the excavated trench. It is inserted vertically and bent at right angles in the trench, and the truck is moved to gradually build it and bury it underground.

However, the waterproof sheet disclosed in Japanese Patent Publication No. 62-2084 has to be inserted vertically into the groove and then bent horizontally at right angles to change the spreading direction of the waterproof sheet, so the entire roll is stretched horizontally. This makes construction difficult because the sheets tend to shift and cannot be rolled out smoothly.

Furthermore, since the waterproof sheet is laid horizontally, there is a limit to the width of the waterproof sheet that corresponds to the depth of the water cutoff wall, making it impossible to construct water cutoff walls deep underground.

The purpose of the present invention is to solve the disadvantages of the conventional example, to have a simple structure, a small number of members, to be able to be constructed easily and inexpensively, to obtain a reliable water-stopping effect, and to be able to construct a water-stopping wall with a large depth. The purpose of the present invention is to provide a method for constructing a water-stop wall.

[Means for solving problems]

In order to achieve the above object, the present invention installs a water stop sheet with adhesive parts formed on the left and right edges in the excavation hole for the preceding element so as to support it with guide metal fittings, and connects the ends of the water stop sheet with joints. Consolidating materials such as concrete and mortar are placed in the excavated hole for the preceding element while protecting it with hardware, etc. Next, the excavated hole for the succeeding element is created and the successor hardware is removed.
The water stop sheet with adhesive parts formed on the left and right edges is sequentially unwound into the excavation hole for the trailing element and suspended in its entirety, connected to the water stop sheet of the leading element by joining the adhesive parts together, and after removing the guide hardware. The gist of this method is to pour a solidifying material such as concrete or mortar into the excavation hole for the trailing element to form a continuous water-stop wall between both the leading and trailing elements.

[Effect]

According to the present invention, since the water-stop sheet is erected in the vertical direction, a water-stop wall with a large depth can be constructed.

In addition, the water stop sheet in the drilling hole for the leading element and the water stop sheet in the drilling hole for the trailing element are adhesively bonded so that their edges overlap and are continuous, and the outside is covered with concrete, mortar, etc. Filled with binder to ensure water stoppage.

〔Example〕

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

First, the case where the leading elements are formed at intervals and the trailing elements are formed in between is explained. First, as shown in FIG. 1, along the guide wall 1,
The ground is excavated to a predetermined depth by using a stabilizing liquid 2 to prevent collapse and by appropriately treating the slime to create an oblong belt-shaped excavation hole 3 for the preceding element.

The above is the same as the construction of a general underground continuous wall.

Next, as shown in FIG. 2, fitting fittings 4 such as locking plates or pipes are set at the left and right ends of the drilling hole 3 for the preceding element, and a columnar guide fitting 5 with steel frames and steel plates bonded to both sides is set. Set it inside.

Then, a water stop sheet 6 such as a vinyl sheet or a rubber sheet is built into the excavation hole 3 along the guide hardware 5, and the water stop sheet 6 is temporarily fixed between the guide hardware 5.

The water stop sheet 6 has adhesive parts 7a formed on the left and right edges using cloth fasteners such as Velcro tape (registered trademark), and when installing it, it is rolled and placed on the ground as shown in Fig. 7. A weight 8 is attached to the end of the drawer so that the metal fitting 5 is sequentially drawn out along the guide hardware 5.

Reference numeral 19 in the figure represents a guide roller in this case, which was attached to the upper end of the guide hardware 5.

As an example of temporarily fixing the water stop sheet 6, electromagnets 9 are attached in advance to the left and right ends continuously or at appropriate intervals, and after the water stop sheet 6 is erected along the guide hardware 5,
When the electromagnet 9 is energized, the water stop sheet 6 can be fixed to the guide hardware 5 by magnetic force.

Furthermore, it is also possible to attach the signal transmission cables 10 to the left and right ends of the water stop sheet 6 and confirm the positions of the left and right ends.

Next, as shown in FIG. 3, the tubular packer 11 is supported by the backer guide 12 and installed inside the fitting 4, and the puffer 11 is inflated by air pressure or liquid pressure to seal the end of the water stop sheet 6. It is inserted and fixed between the guide hardware 5. In this way, the end of the water stop sheet 6 is surrounded by the guide metal fitting 5 and the bunker 11 within the joint metal fitting 4, and is protected without being exposed to the outside.

Then, as shown in FIG. 4, a consolidating material 20 such as mortar, concrete, etc. including fill mortar is placed in the excavated hole 3 in the front and rear directions, leaving the ends of the water stop sheet 6 intact.

After hardening of the consolidating material 20, an adjacent location is excavated to create an oblong strip-shaped excavation hole 13 for the trailing element, and as shown in FIG. 5, the pressure inside the bunker 11 is reduced and the bunker is removed together with the packer guide 12, and the guide Pull out the fitting hardware 4 leaving the hardware 5 (.

Then, the ends of the waterstop sheet 6 appear on both sides of the excavated hole 13.

As shown in FIG. 9, it is a sheet made of a waterproof material such as a band-shaped vinyl sheet or a synthetic rubber sheet similar to the water stop sheet 6 for the preceding element, and the adhesive portion 7a of the water stop sheet 6 is attached to both left and right edges of the front side. A water stop sheet 14 for the trailing element having an adhesive portion 7b that can be bonded thereto is prepared, wound into a roll, and attached to a hanging tool 16 provided with a pressure roller 15 in front.

When the adhesive part 7a of the water stop sheet 6 is made of a cloth fastener such as Velcro, the adhesive part 7a of the water stop sheet 14
b also uses one piece of this fastener.

In addition, as another example, what about these adhesive parts? In addition to the fabric adhesive such as Magic Tape (registered trademark) forming the portions a and 7b, an adhesive tape may be used, or another adhesive may be applied in the form of a tape.

As shown in FIGS. 8 and 9, the roll-shaped water-stop sheet 14 is held up by the hanging tool 16 so that the adhesive part 7a at the end of the water-stop sheet 6 that has already been installed is aligned with the adhesive part 7b. It is suspended in the excavation hole 13, and the tip of the water stop sheet 14 is drawn out and fixed to the guide wall 1. And water stop sheet 6
Catch the end with the signal from the signal transmission cable lO,
While correcting the position so that the bonded parts 7a and the bonded parts 7b always overlap, they are lowered into the excavated hole 13 while being unwound one by one, and the reaction force is removed by the guide hardware 5 by the crimping roller 15 that protrudes forward. The water-stop sheet 6 and the water-stop sheet 14 are joined together to form a single water-stop film.

Next, as shown in FIG. 6, after removing the guide hardware 5, a solidifying material 20 such as fill mortar, mortar, concrete, etc. is placed in the excavated hole 13, including the adhesive part 7b with the water supply sheet 6, to stop water. It is poured before and after the sheet 14.

In this manner, the above-described process is repeated to construct a continuous water-stop wall by integrally and continuously forming the water-stop sheet for each of the leading and trailing elements, and fixing the outer side with the consolidating material 20.

In addition, when constructing a water cutoff wall at great depth, drilling hole 3.1
3 is also deeper, but in this case, as shown in FIG.
A, a second built-in water stop sheet 18 is formed into a roll shape by forming an adhesive part 17b that can be adhered thereto on the tip edge of the back side.
It is also possible to suspend the whole roll into the excavation hole 3 and install it as a long water stop sheet.

Furthermore, in the embodiment described above, a plurality of drilling holes 3 for the preceding element are formed at intervals, and a drilling hole 13 for the following element is formed between them. The same applies to construction methods such as sequentially forming and extending horizontally.

〔Effect of the invention〕

As explained above, in the method of constructing a water stop wall of the present invention, the ends of the sheets are glued together and overlapped, and the sheets are integrated and continuous and embedded in a frame of solidified material such as concrete. Therefore, water-stopping properties are high, and there is no water leakage from the joints between the sheets, and since the joints of the consolidation material and the joints between the sheets are misaligned, water can be reliably stopped.

In addition, since the water-stop sheet is installed vertically and joined at the left and right edges, it is possible to construct a water-stop wall deep underground, regardless of the width of the water-stop sheet and the depth of the water-stop wall to be built underground. When installing the water stop sheet, it is unrolled and lowered vertically in sequence, so it can be unrolled smoothly without shifting, making it easy to install.

In this way, water can be reliably stopped by the water stop film, so it is sufficient to make the water stop wall thin (even if it is thin), the amount of mortar, etc. used can be reduced, and the reinforcement It is economical because it is not used, and especially if fill mortar is used as the consolidation material, it can be constructed at a low cost.

[Brief explanation of the drawing]

FIGS. 1 to 6 are plan views showing the construction process of the water-stop wall construction method of the present invention, FIG. 7 is a view taken along arrow A-A in FIG.
FIG. 8 is a side view showing how the water stop sheet is installed in the trailing element, FIG. 9 is a front view showing how the water stop sheet is installed in the trailing element, and FIG. 10 is the water stop sheet according to the present invention. It is a side view which shows the 2nd Example of the construction method of a wall, and shows the state in which a water stop sheet is built into the excavation hole for a preceding element. 1...Guide wall 2...Stabilizing liquid 3...Drilling hole of preceding element 4...Joint hardware 5...Guide hardware 6...
・Water stop sheet 8 for the preceding element... weight
7a, 7b...Adhesive part 10...Signal transmission cable 9...Electromagnet 11...Backer 12...Packer guide 13...Drilled hole 14 for trailing element...For trailing element water stop sheet 15...pressure roller 16...hanging tool 17a, 17b...
Adhesive part 18...Second built-in water stop sheet

Claims (1)

[Claims] A water stop sheet with adhesive parts formed on the left and right edges is installed in the excavation hole for the preceding element, supported by guide hardware, and the ends of the water stop sheet are protected with joint hardware, etc., and excavation for the preceding element is started. Consolidating materials such as concrete and mortar were placed in the hole, and then an excavation hole for the trailing element was created. Successor hardware, etc. was removed, and adhesive parts were formed on the left and right edges in the excavation hole for the trailing element. The water stop sheet is unwound in sequence and suspended in its entirety. Connected to the water stop sheet of the preceding element by joining the adhesive parts, and after removing the guide hardware, concrete or mortar or other consolidating material is poured into the excavated hole for the following element. 1. A method for constructing a water cutoff wall, characterized in that a continuous water cutoff wall is formed using both leading and trailing elements.