JP4532337B2 - Propile pile sheet pile method capable of treating underground water - Google Patents

Description

  The present invention belongs to the technical field of the main pile lateral sheet pile method for constructing a retaining wall at the time of ground excavation, and moreover, an underground water layer that cannot be examined in a preliminary survey such as a ground survey is within the excavation depth. It is related to the parent pile side sheet construction method that can be used to treat underground water afterwards.

  Conventional parent pile sheet pile methods can be examined by preliminary surveys such as ground surveys, for example, so that the ground with a high groundwater level can be excavated while being stopped (Patent Document) 1-5). In other words, it is an effective technique when it is known from the beginning that groundwater treatment is necessary as a premise, and it is rarely adopted when it is found that it is not necessary in a preliminary survey.

In that case, the usual pile pile sheet pile method is adopted, in which sheet piles are inserted between the piles made of H-shaped steel as the excavation progresses, but the underground water layer that cannot be examined in the preliminary survey such as ground survey Etc. exist within the excavation depth, it is necessary to treat underground water after the fact. The treatment method for the underground water is generally (I) pumping underground water, etc. at the back of the retaining wall, or (II) constructing a water shielding layer by injecting chemicals into the underground water layer, etc. is there.
Japanese Patent Publication No. 7-47844 Japanese Patent Laid-Open No. 9-71931 Japanese Patent Laid-Open No. 9-111754 JP 2001-107361 A Japanese Patent No. 2818843

  In the treatment method (I), when the underground water layer or the like is deep, the construction of equipment for pumping water increases. Moreover, it is impossible to construct a facility for pumping water unless there is room on the back of the retaining wall. Moreover, since the facilities are constructed, there is a problem that the ground on the back of the retaining wall is disturbed.

  The treatment method (II) is expensive because the chemical solution is expensive and requires a large amount. Moreover, since it takes time to prepare for injecting the chemical solution, injecting work and waiting for curing, the construction period is greatly delayed. In addition, there is a problem that the sand on the back surface of the retaining wall is swept away by underground water or the like until it hardens, and the ground on the back surface of the retaining wall is disturbed.

  The purpose of the present invention is to allow the treatment of underground water and the like afterwards without greatly changing the flow of the usual main pile pile sheet method, that is, when excavation reaches the underground water layer, etc. , Step by step the arrangement of guiding underground water etc. from the water-permeable sheet placed on the back of the sheet pile to the water collecting groove formed below the sheet pile, and finally pumping underground water etc. led to the water collecting groove, By drilling to the depth of the bottom of the excavation, there is no need to construct a large facility for pumping underground water, etc., or to inject chemicals, contributing to cost reduction and shortening the construction period, and the back of the retaining wall It is to provide a parent pile sheet pile method capable of processing underground water and the like, which can be carried out even if there is no room.

  The next object of the present invention is to provide a parent pile lateral sheet pile method capable of treating underground water and the like while maintaining the ground on the back surface of the retaining wall in a healthy state.

As a means for solving the above-mentioned problems of the prior art, the parent pile horizontal sheet pile method capable of processing underground water according to the invention described in claim 1 is:
It is a parent pile horizontal sheet pile method that can treat underground water,
A process of driving a parent pile made of H-shaped steel around the excavated ground to a depth below the final excavation bottom;
Excavating the excavated ground, as the excavation progresses, inserting a sheet pile between the parent piles,
When the excavation reaches the underground water layer, etc., only the bottom surface of the surrounding area such as the exposed underground water layer is pre-excavated. Address the configured water-permeable sheet, insert a sheet pile between the parent piles to support the water-permeable sheet, and further cover the front surface of the sheet pile with a water-resistant sheet, with underground water etc. on the back surface of the sheet pile From the arranged water-permeable sheet, it is configured to guide to a water collecting groove formed below the sheet pile, and a process of pumping underground water led to the water collecting groove,
Later, as excavation progressed, the underground flow water led to the drainage channel was gradually changed from the water-permeable sheet placed on the back of the sheet pile to the drainage groove formed below the sheet pile. Drilling to the depth of the final excavation bottom,
It is characterized by comprising.

The invention according to claim 2 is the parent pile lateral sheet pile method capable of processing underground water and the like according to claim 1,
The preceding excavation is characterized by excavating to a depth that reaches an impermeable layer that accumulates underneath the underground water layer.

The invention according to claim 3 is the parent pile horizontal sheet pile method capable of processing underground water or the like described in claim 1 or 2,
The water collecting groove formed immediately after the excavation reaches the underground water layer or the like is formed by further excavating a plane area excavated in advance after covering the front surface of the sheet pile with a water-proof sheet.

The invention according to claim 4 is the parent pile lateral sheet pile method capable of processing underground water or the like according to claim 1 or 2,
The water collecting groove formed immediately after the excavation reaches the underground water layer or the like is characterized in that the excavation bottom surface around the exposed underground water layer or the like is excavated and formed.

The invention according to claim 5 is the main pile lateral sheet pile method capable of processing underground water or the like according to claim 1,
The water collecting groove formed in the flat area that was excavated in advance is dug down step by step, and the structure that guides the underground water etc. from the water-permeable sheet arranged on the back of the sheet pile to the water collecting groove formed below the sheet pile is changed. The process of pumping underground water, etc., led to the catchment groove, and the process of continuously pumping underground water, etc., led to the catchment groove, and excavating plane areas other than the previously excavated plane area are repeated. It is characterized by drilling to a depth of.

The invention according to claim 6 is the parent pile lateral sheet pile method capable of processing underground water or the like according to claim 1 or 5,
A kettle is formed in the catchment ditch, and after the catchment groove is formed in the final process, a simple pumping well is formed in the catchment in the catchment ditch and pumping of underground water, etc. is continued from the simple pumping well. Place the crushed stone in the water collecting groove and adjust it to a height approximately equal to the bottom of the final excavation.The bottom surface of the crushed stone is covered with a water-proof sheet for the bottom so that it is continuous with the lower end of the water-proof sheet covering the front of the sheet pile. It is characterized in that smooth concrete is placed on the bottom surface of the excavation bottom surface and the bottom water-proof sheet that covers and exposes without gaps.

The invention according to claim 7 is the parent pile sheet pile method capable of processing underground water or the like according to claim 6,
It is characterized by guiding the catchment groove to the inside of the excavated ground and forming a pothole in the catchment groove.

  The main pile horizontal sheet pile method capable of treating underground water and the like according to the present invention is capable of treating underground water and the like afterwards without greatly changing the flow of the usual parent pile horizontal sheet pile method, that is, excavation is underground After reaching the water layer, etc., as the excavation progresses, the structure that guides underground water, etc., from the water-permeable sheet placed on the back of the sheet pile to the water collecting groove formed below the sheet pile is gradually changed. While pumping underground water, etc., led to the ditches, drilling to the depth of the bottom of the final excavation, it is not necessary to build a large-scale facility for pumping underground water, etc. Contributes to shortening.

  And since it can implement if there is a space which can arrange | position a water-permeable sheet in the back surface of a sheet pile, even if there is no allowance in the back surface of a mountain retaining wall, it can implement.

  In addition, a water-permeable sheet made of a fiber material that allows water to pass through the excavation side, but hardly allows sand to pass, is processed through underground water, etc., through the water-permeable sheet. The underground water can be treated while maintaining the ground on the back of the retaining wall sound.

  A parent pile made of H-shaped steel is placed around the excavated ground to the depth of the final excavated bottom. The excavated ground is excavated, and as the excavation progresses, sheet piles are inserted between the parent piles to secure the mountain. When the excavation reaches the underground water layer, etc., only the bottom surface of the surrounding area such as the exposed underground water layer is pre-excavated. Address the configured water-permeable sheet, insert a sheet pile between the parent piles to support the water-permeable sheet, and further cover the front surface of the sheet pile with a water-resistant sheet, with underground water etc. on the back surface of the sheet pile The arrangement is such that the water permeable sheet is guided to the water collecting groove formed below the sheet pile, and the underground water or the like led to the water collecting groove is pumped up. Later, as excavation progressed, the underground flow water led to the drainage channel was gradually changed from the water-permeable sheet placed on the back of the sheet pile to the drainage groove formed below the sheet pile. Drill up to the depth of the bottom of the final excavation while pumping up etc.

  A main pile lateral sheet pile method (hereinafter simply referred to as parent pile) capable of processing underground water (including groundwater other than underground water) according to the inventions described in claims 1 to 3 and claims 5 and 6. (It may be abbreviated as a horizontal sheet pile method.) Is explained based on the drawings.

  The main pile side sheet pile method of the present invention is carried out in order to construct a retaining wall at the time of ground excavation, and in particular, there is an underground water layer that can not be examined by a preliminary survey such as ground survey (however, it can also be carried out in a flowing water layer). It is preferably implemented when it exists within the excavation depth.

First, similarly to the usual parent pile side sheet pile method, a plurality of H-section steels 2 are placed around the excavated ground 1 as a parent pile at equal intervals to a depth H ₁ or less of the final excavation bottom surface. And excavation ground 1 is excavated, and sheet pile 3 is inserted between H section steels 2 and 2 with progress of excavation (refer to Drawing 1 and Drawing 2).

When excavation proceeds and reaches the underground water layer 4, only the bottom surface 1 a (see FIG. 2) around the exposed underground water layer 4 is deposited directly under the underground water layer 4 (but not limited to this). impermeable layer 5 (e.g., clay layer) reached, and a new sheet pile 3 precedes drilling to a depth H ₂ can be inserted (the second aspect of the invention). And the water-permeable sheet 6 is addressed to the excavation side surface 1b below the underground flow water layer 4 between the H-section steels 2 and 2 where the underground water layer 4 is exposed, and the sheet pile is interposed between the H-section steels 2 and 2. 3 is inserted to support the water-permeable sheet 6 (see FIGS. 3 to 5).

  The water-permeable sheet 6 is made of a fiber material that allows water to pass therethrough but hardly passes sand (for example, Hetimaron (registered trademark) sold by Nihon Daigyo Co., Ltd.), and has substantially the same width and height as the sheet pile 3. Is formed. The water permeable sheet 6 is arranged on the back surface of the sheet pile 3 so that it is not crushed by the sheet pile 3 inserted between the H-section steels 2 and 2. When the underground water layer 4 is reached, it immediately excavates to the impermeable layer 5 and the permeable sheet 6 is directed to the excavation side surface 1b, so that the underground water in the underground water layer 4 is more permeable than the impermeable layer 5. Guided to a high water permeable sheet 6. And since the underground water is filtered through the water-permeable sheet 6, sand hardly flows out together with the underground water, and the ground on the back surface of the sheet pile 3 can be kept healthy. Incidentally, the excavation side surface 1b is excavated in the back direction by the thickness of the sheet pile 3 and the water permeable sheet 6.

  The front surface of the sheet pile 3 is covered with a water-stop sheet 7 (see FIG. 5 and the like). Specifically, the water-proof sheet 7 is made of a poly film similarly to a normal water-proof sheet, and is formed to be slightly larger in both width and height than the sheet pile 3. Both side portions of the water-proof sheet 3 are fixed to the flanges 2a and 2a of the H-shaped steels 2 and 2 on both sides with an adhesive (not shown in the figure, and can be a gum tape or the like).

  A pre-excavated plane region (hereinafter, the same reference numeral as the excavation bottom surface 1a) 1a is further excavated, and a continuous collection from the excavation bottom 1c in front of the sheet pile 3 to the water permeable sheet 6 through the lower side of the sheet pile 3 A water groove 8 is formed (see the invention of claim 3, see FIGS. 6 and 7). As a result, the underground water in the underground water layer 4 is guided from the water-permeable sheet 6 disposed on the back surface of the sheet pile 3 to the water collecting groove 8 formed below the sheet pile 3. A pot 9 is formed in the water collecting groove 8, and water is collected in the pot 9 and pumped up by a pump 10. Incidentally, the water collecting groove 8 has a depth that does not overflow when the underground water is guided.

Thereafter, as the excavation progresses, the structure in which underground water is led from the water-permeable sheet 6 disposed on the back surface of the sheet pile 3 to the water collecting groove 8 formed below the sheet pile 3 is gradually changed into the water collecting groove 8. while pumping the underflow water led, excavation of the final drilling bottom depth to H _1.

  More specifically, the underground water is continuously pumped up from the basin 9 by the pump 10, so that the underground water 1 d is not overflowed from the water collecting groove 8 in the flat area 1 d other than the previously excavated flat area 1 a. Is excavated to a position higher than the bottom surface 8a (excavated bottom surface one level above Kamaba 9), and a sheet pile 3 is inserted between the H-section steels 2 and 2 (hereinafter referred to as plane region 1d other than the previously excavated plane region 1a). (See FIGS. 8 and 9).

Next, in order to continue pumping underground water from Kamaba 9, the catchment channel 8 is dug down step by step, and the underground water is continuously pumped up by the pump 10 while changing the order, and a new sheet pile 3 is inserted. When reaching the depth H ₃ where the water collecting groove 8 is formed below the sheet pile 3, the water permeability to the excavation side surface 1 b between the H-section steels 2, 2 is continuous with the upper water-permeable sheet 6. The sheet 6 is directed, the sheet pile 3 is inserted between the H-shaped steels 2, 2 to support the water-permeable sheet 6, and the front surface of the sheet pile 3 is covered with a water-proof sheet 7 (hereinafter referred to as “collection”). This is referred to as a refilling process of the water groove 8. See FIG. That is, the structure led from the water-permeable sheet 6 disposed on the back surface of the sheet pile 3 to the water collecting groove 8 formed below the sheet pile 3 is changed step by step. Incidentally, the upper end portion of the water-proof sheet 7 is continuously wrapped by being wrapped with the lower end portion of the upper water-proof sheet 7 (see FIG. 11). Therefore, there is no possibility that underground water leaks from the front surface of the sheet pile 3.

Repeat the prime replacement process of the catchment groove 8, the planar region 1d Nonleading excavated plan area 1a and the excavation process, when digging to a depth H ₁ of the final drilling bottom construction of earth retaining wall 11 is completed (See the invention according to claim 5, FIG. 12).

  Thereafter, in this embodiment, the water collecting groove 8 is dug stepwise, and the submerged water is continued to be pumped up while being refilled. When reaching a depth at which a new sheet pile 3 can be inserted, it continues with the upper water-permeable sheet 6. Further, the water-permeable sheet 6 is directed to the excavation side surface 1b between the H-shaped steels 2 and 2, and the sheet pile 3 is inserted between the H-shaped steels 2 and 2 to support the water-permeable sheet 6. (See FIGS. 13 to 15). At this time, the water-permeable sheet 6 and the water collecting groove 8 are blocked by the sheet pile 3, but since the water-stop sheet 7 is not installed on the front surface of the sheet pile 3, the underground water flows between the upper sheet pile 3. Because it oozes out from the sheet pile 3 itself, there is no problem in the water collecting function.

  Furthermore, a pump 10 inserted into the steel pipe 12 by forming a simple pumping well by erecting a steel pipe 12 provided with a plurality of holes (not shown) at the bottom in the pot 9 of the water collecting groove 8. Continue pumping underground water. Then, the crushed stone 13 is spread around the steel pipe 12 and adjusted to a height substantially equal to the bottom surface of the final excavation, and the crushed stone 13 is continuous with the lower end portion of the water-stop sheet 7 that covers the front surface of the sheet pile 3 immediately above the lowest step. The upper surface is covered with the water-proof sheet 14 for the bottom surface without any gap. Specifically, the side end portion of the water-stop sheet 14 for the bottom surface is continuously wrapped and wrapped in the front surface of the water-stop sheet 7 that covers the front surface of the sheet pile 3 immediately above the lowest level (see FIG. 16). . Finally, the leveled concrete 15 is placed on the top surfaces of the exposed excavation bottom surface 1e and the bottom water-proof sheet 14.

  The above-mentioned main pile horizontal sheet pile method can be treated afterwards without greatly changing the flow of the conventional parent pile horizontal sheet pile method, that is, when the excavation reaches the underground water layer 4, As the process progresses, the underground water is gradually changed from the water-permeable sheet 6 disposed on the back of the sheet pile 3 to the water collecting groove 8 formed below the sheet pile 3, and the underground water led to the water collecting groove 8. Since it excavates to the depth of the bottom of the final excavation while pumping up, it is not necessary to construct a large-scale facility for pumping underground water, or to inject chemicals, thereby contributing to cost reduction and shortening of construction period.

  And since it can implement if there exists a space which can arrange the water-permeable sheet 6 in the back surface of the sheet pile 3, even if there is no allowance in the back surface of the mountain retaining wall 11, it can implement.

  Moreover, since the water permeable sheet 6 made of a fiber material that allows water to pass through the excavation side surface 1b but hardly penetrates sand is addressed, and the underground water is processed through the water permeable sheet 6, the filtration function works together with the underground water. The sand does not flow out, and the underground water can be treated while maintaining the ground on the back of the retaining wall 11 in a healthy state.

  In the above-described embodiment, the flat area 1a and the flat area 1d other than the flat area 1a are excavated in separate processes. However, the height of the flat area 1a being excavated and the flat area 1d other than the flat area 1a is high or low. When the difference is 1 m or more, in order to ensure safety, the flat area 1d other than the flat area 1a is excavated in parallel with the excavation of the flat area 1a.

In Example 1 described above, the preceding excavation of the excavation bottom surface 1a around the underground water layer 4 and the formation of the catchment groove 8 are performed in separate steps. Also good.
That is, when the excavation reaches the underground water layer 4, only the excavated bottom surface 1 a around the exposed underground water layer 4 reaches the impermeable layer 5 deposited immediately below the underground water layer 4, and a new sheet pile 3 is inserted. When this is done, a pre-excavation is performed to a depth where the water collecting groove 8 is formed below the sheet pile 3 (the invention according to claim 4). That is, the preceding excavation is performed at a stretch so as to obtain the form shown in FIG.

  The pot place 9 shown in FIG. 7 and the like is formed on the side of the excavated ground 1, but the water collecting groove 8 is guided to the inside of the excavated ground 1 to form the pot place 9 in the water collecting groove 8. (Refer to FIG. 17, invention according to claim 7).

  Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments and can be implemented in various forms without departing from the gist of the present invention.

It is process drawing of the parent pile horizontal sheet pile method which can process underground water etc. which concern on this invention. It is AA arrow sectional drawing of FIG. It is process drawing of the parent pile horizontal sheet pile method which can process underground water etc. which concern on this invention. It is a BB arrow sectional view of Drawing 3. It is sectional drawing which showed the structure around a sheet pile. It is process drawing of the parent pile horizontal sheet pile method which can process underground water etc. which concern on this invention. It is CC sectional view taken on the line of FIG. It is process drawing of the parent pile horizontal sheet pile method which can process underground water etc. which concern on this invention. It is DD sectional view taken on the line of FIG. It is process drawing of the parent pile horizontal sheet pile method which can process underground water etc. which concern on this invention. It is the figure which showed the continuous structure of the upper water-proof sheet and the lower water-proof sheet. It is process drawing of the parent pile horizontal sheet pile method which can process underground water etc. which concern on this invention. It is process drawing of the parent pile horizontal sheet pile method which can process underground water etc. which concern on this invention. It is EE arrow sectional drawing of FIG. It is the schematic perspective view which showed the last form of the parent pile horizontal sheet pile method which can process underground water etc. which concern on this invention. It is the figure which showed the continuous structure of the water-stop sheet | seat installed in the front surface of the sheet pile right above the lowest step, and the water-stop sheet for bottom faces. It is the horizontal sectional view which showed the Example from which this invention differs.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Excavation ground 1a Excavation bottom surface around underground water layer 1b Excavation side surface below underground water layer 1d Plane area other than prior excavation area 2 H-section steel 3 Sheet pile 4 Underflow water layer 5 Impervious layer 6 Permeability sheet 7 Sheet 8 Catchment groove 9 Kamaba 13 Crushed stone 14 Water-proof sheet for bottom surface H ₁ Depth of bottom surface of final excavation

Claims (7)

It is a parent pile horizontal sheet pile method that can treat underground water,
A process of driving a parent pile made of H-shaped steel around the excavated ground to a depth below the final excavation bottom;
Excavating the excavated ground, as the excavation progresses, inserting a sheet pile between the parent piles,
When the excavation reaches the underground water layer, etc., only the bottom surface of the surrounding area such as the exposed underground water layer is pre-excavated. Address the configured water-permeable sheet, insert a sheet pile between the parent piles to support the water-permeable sheet, and further cover the front surface of the sheet pile with a water-resistant sheet, with underground water etc. on the back surface of the sheet pile From the arranged water-permeable sheet, it is configured to guide to a water collecting groove formed below the sheet pile, and a process of pumping underground water led to the water collecting groove,
Later, as excavation progressed, the underground flow water led to the drainage channel was gradually changed from the water-permeable sheet placed on the back of the sheet pile to the drainage groove formed below the sheet pile. Drilling to the depth of the final excavation bottom,
A parent pile side sheet construction method capable of treating underground water and the like.   The pre-excavation excavates to a depth that reaches an impermeable layer that accumulates underneath the underground water layer or the like, and the pile piled sheet pile method capable of processing underground water or the like according to claim 1.   The water collecting groove formed immediately after the excavation reaches an underflow water layer or the like is formed by further excavating a plane area excavated in advance after covering the front surface of the sheet pile with a water-proof sheet. A parent pile sheet pile method capable of processing underground water or the like described in 1 or 2.   The water collecting groove formed immediately after the excavation reaches the underground water layer or the like is formed by preceding excavation of the surrounding bottom surface of the exposed underground water layer or the like, and is formed according to claim 1 or 2. A parent pile sheet pile method that can treat underground water.   The water collecting groove formed in the flat area that was excavated in advance is dug down step by step, and the structure that guides the underground water etc. from the water-permeable sheet arranged on the back of the sheet pile to the water collecting groove formed below the sheet pile is changed. The process of pumping underground water, etc., led to the catchment groove, and the process of continuously pumping underground water, etc., led to the catchment groove, and excavating plane areas other than the previously excavated plane area are repeated. The main pile pile sheet pile method capable of treating underground water or the like according to claim 1, wherein the pile is excavated to a depth of 5 mm.   A kettle is formed in the catchment ditch, and after the catchment groove is formed in the final process, a simple pumping well is formed in the catchment in the catchment ditch and pumping of underground water, etc. is continued from the simple pumping well. Place the crushed stone in the water collecting groove and adjust it to a height approximately equal to the bottom of the final excavation.The bottom surface of the crushed stone is covered with a water-proof sheet for the bottom so that it is continuous with the lower end of the water-proof sheet covering the front of the sheet pile. 6. The main pile lateral sheet pile capable of treating underground water or the like according to claim 1, wherein the concrete is placed on the bottom surface of the excavation bottom surface and the bottom water-proof sheet, which covers and exposes without a gap. Construction method.   The main pile side sheet pile method capable of treating underground water and the like according to claim 6, characterized in that the catchment groove is guided to the inside of the excavated ground and a pothole is formed in the catchment groove.

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