JP5155360B2 - Drainage structure in the well method for embankment reinforcement - Google Patents

Description

The present invention relates to a drainage structure in embankments reinforcing well construction method, in particular, embankment reinforcement to collect and discharge permeate that permeates the embankment portion and the base ground of the dam of river flood or the like The present invention relates to a drainage structure in a well construction method and a water collecting block used therefor.

  Existing rivers increase due to typhoons and torrential rains, etc., and the river levee breaks down. The river bank erodes and breaks down directly due to running water (erosion destruction), and river water penetrates into the levee and collapses. In addition, there is a phenomenon in which the base of the levee body penetrates and collapses from the back side of the dam body due to piping phenomenon (osmotic failure).

  Until recently, as a countermeasure against this erosion, the surface of the levee river side was covered with a concrete block so that the surface of the levee river was not eroded, or a water shielding sheet was used to prevent the river water from penetrating into the river levee body. A method to prevent or a rooting work or a water control work to prevent local scouring of the base ground of the levee body due to the flow velocity has been implemented.

  In particular, dyke breaks today have often led to dyke breakage due to a decrease in the strength of the foundation ground of the dam body and subsidence due to piping phenomenon. Measures against this dam body destruction include the construction of a water stop wall with a concrete wall on the outside of the levee (river side), a water stop wall using a water stop sheet pile, or embedding a concrete wall in the ground to stop it. For example, water walls have been built.

  In addition, today, a well construction method is adopted in which permeated water that has penetrated into the levee body is collected and stored in a hole excavated deep into the ground, and this is pumped out to the ground surface by a so-called well. For example, see Patent Document 1 and Patent Document 2). In the case of this well construction method, the permeated water that has penetrated into the levee body penetrates to a well provided at a distant place and is then discharged.

JP 2004-68485 A. JP 2004-116152 A.

  However, in the conventional method of draining osmotic water using the well method, the osmotic water that has permeated into the levee body is collected and collected in a hole (well) and pumped out to the surface with a pump. When water permeability is not secured, the water collecting function is not sufficient, and it takes time for the permeated water to reach the well, and a sufficient discharge treatment cannot be performed over a wide range. As described above, in the case of the conventional system, there is a problem that the functionality is poor and the economical efficiency is poor because wells and the like must be provided at many positions.

Therefore, by using the well method, is a technical problem to be solved in order to provide a drainage structure in embankments reinforcing wells method which is adapted to penetrate water penetrated into embankment can continuously effectively removed The present invention aims to solve this problem.

The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 is characterized in that the base ground of an existing river levee body has a constant depth at intervals set along the river dam body. A block for collecting water used in a well construction method for embankment strengthening, in which a slot is excavated and connected in a horizontally long shape along the slot in the slot, and collects and discharges permeate in the bank. The water collecting block has a hollow horizontally long prismatic shape, and has an engaging concave portion on one side and an engaging convex portion that can be inserted and engaged with the engaging concave portion on the other side. In the drainage structure in the well construction method for embankment reinforcement in which the engaging convex part of one water collecting block is inserted and engaged with the engaging concave part of another water collecting block and stacked, The reinforcement target area is defined, and the reinforcement target area is defined by the lower part of the inner slope of the levee body and this part. Consists foundation ground subsequent peripheral portion, the foundation ground along the embankment excavated slot of constant depth at a preset interval, hitting the base material made of concrete material on the bottom surface of the groove hole Furthermore, the inner surface of the slot is covered with a sucking prevention sheet, and the water collecting blocks are juxtaposed along the dam body from above the sucking prevention sheet and stacked in a plurality of stages. A drainage wall is formed, and the drainage wall is further covered with a net sheet, and drainage material having excellent water permeability is introduced into the outer slope side and the inner slope side of the drainage wall so as to form the groove hole. Embankment strengthening that fills the gap and absorbs the seepage flow generated in the foundation ground of the reinforcement target site at the reinforcement target site and eliminates the strength degradation of the foundation ground due to piping phenomenon, etc. The drainage structure in the well construction method That.

According to this configuration, when the water level on the outside of the levee body (river side) rises due to water increase or the like and an osmotic flow is generated in the foundation ground of the levee body, the osmotic flow is supplied to the drain material and the drain. The permeation prevention sheet disposed outside the material penetrates and is sucked into the strengthening target portion as permeated water, and the sucked permeated water does not flow backward from the strengthening target portion to the outside. Therefore, the permeated water that has permeated the suction prevention sheet and sucked into the site to be reinforced passes through the drain material and the sheet net and is collected in the water collecting block of the drainage wall, and further passes through the drainage wall. It is sent to a predetermined place such as a reservoir and well and processed continuously.

According to a second aspect of the present invention, in the first aspect of the present invention , the suck-out prevention sheet provides a drainage structure in a well method for embankment reinforcement made of plastic fiber or a wire net .

A third aspect of the present invention provides the drainage structure in the embankment strengthening well construction method in which the drain material is made of chestnut or single-grain crushed stone .

The invention according to claim 1, 2, or 3 is a drain material made of chestnut or single-grain crushed stone, and a plastic fiber disposed outside the drain material. Alternatively, the permeation preventive sheet made of a wire mesh is permeated and efficiently sucked into the strengthening target portion as permeated water, and the sucked permeated water does not flow backward from the strengthening target portion. Therefore, the permeated water sucked into the region to be reinforced passes through the drain material and the sheet net and is efficiently collected in the water collecting block on the drainage wall, and is further sent to a predetermined location and continuously processed. Thus, it is possible to prevent the breakage of the levee body by eliminating the strength reduction and ground subsidence due to the piping phenomenon.

The longitudinal cross-sectional view which shows one Example at the time of giving the drainage structure in the well construction method for embankment reinforcement which concerns on this invention to the base ground of the existing standard river bank body. The expanded sectional view of the reinforcement | strengthening object site | part of this invention which gave the drainage structure in FIG. The expansion perspective view of the water collection block arrange | positioned in the lower layer part of the drainage structure of FIG. The front view of the lower water catchment block in FIG. The side view of the lower layer book in FIG. AA line sectional view of Drawing 3. The expansion perspective view of the water collection block arrange | positioned in the uppermost layer part of the drainage structure of FIG. Sectional drawing which shows the modification of the drainage structure in a reinforcement | strengthening object part same as the above. The expansion perspective view of the water collection block arrange | positioned in the lower layer part of the drainage structure of FIG.

In order to achieve the object of the present invention to provide a drainage structure in a well construction method for embankment reinforcement that can effectively remove permeated water that has penetrated into the levee body using a well construction method, Excavating a predetermined depth of a groove in the base ground of the existing river levee body at a set interval along the river dam body, and being connected and disposed in a horizontally long manner along the groove hole in the groove hole, A water collecting block for use in a well construction method for collecting and discharging osmotic water in a levee body, the water collecting block having a rectangular shape with a hollow horizontal shape and having an engaging recess on one side. And an engaging projection that can be inserted and engaged with the engaging recess on the other surface side, and the engaging projection of one water collecting block is inserted into the engaging recess of another water collecting block. For drainage structure in well construction method for embankment strengthening constructed by stacking And the reinforcement target portion is defined on the foundation ground of the river levee body, and the reinforcement target portion is composed of a lower portion of the inner slope of the levee body and a foundation ground of a peripheral portion subsequent thereto, Excavating a slot of a certain depth at a predetermined interval along the bank body, placing a base material on the bottom surface of the slot, further covering the inner surface of the slot with a suction prevention sheet, and The drainage wall is formed by stacking the water collecting blocks side by side along the bank body on the foundation material from above the suction prevention sheet to form a drainage wall, and the outside of the drainage wall is covered with a net sheet. In addition, a drain material having excellent water permeability is inserted into the outer slope side and the inner slope side of the drainage wall to fill the gap between the slots, and the osmotic flow generated in the foundation ground of the reinforcement target portion is strengthened. Decrease in strength of foundation ground due to piping phenomenon etc. Comb was achieved by providing the drainage structure in the well construction method for embankment reinforcement, characterized in that to be able to prevent destruction of the embankment.

  Hereinafter, a preferred embodiment of the drainage structure of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a longitudinal sectional view showing an embodiment in which a drainage structure according to the present invention is applied to the base ground of an existing standard river bank body. In this figure, in this river levee body, a site 13 to be strengthened is provided on the foundation ground 12 following the inner slope 11 of the dam body 10, and the water level on the outer side of the levee (river side) rises due to the increase in water, etc. When a flow of water (osmotic flow) occurs in the foundation ground 12 of the dam body 10, the osmotic flow is absorbed by the region 13 to be strengthened, and the strength reduction and ground subsidence due to the piping phenomenon are eliminated. Thus, the breakage of the dam body 10 is prevented.

  FIG. 2 is an enlarged cross-sectional view of the reinforcement target portion 13 of the bank body 10. In the figure, first, an example of a construction procedure of the reinforcement target portion 13 will be described. A groove 20 having a constant depth is excavated in the lower portion of the inner slope 11 of the dam body 10 and the foundation ground 12 in the peripheral portion following the inner slope 11 at intervals set along the dam body 10. Then, a base material (concrete material) 14 is placed on the bottom surface of the excavated slot 20. Next, the inner surface of the excavated slot 20 is covered with the suction prevention sheet 15, and the water collecting blocks 16 are arranged on the foundation material 14 from above the suction prevention sheet 15 along the bank body 10. The drainage walls 17 are formed by stacking the water collecting blocks 16. Next, the outside of the drainage wall 17 is covered with a net sheet 18 formed of plastic fiber or a wire net so that clogged stones, single grain crushed stones and the like do not flow into the water collecting block 16 and clogging occurs, If the drainage material 19 having excellent water permeability, such as chestnut stone or single-grain crushed stone, is inserted before and after the drainage wall 15 (outside slope side and inside slope side), the gap in the slot 20 is filled. Site 13 can be built.

  The suction preventing sheet 15 disposed outside the drain material 19 sucks the osmotic flow generated outside the reinforcement target portion 13 into the reinforcement target portion 13 as osmotic water, and once sucks this. Thus, the permeated water cannot flow backward from the reinforcement target portion 13 to the outside.

  Therefore, in the reinforcement target portion 13, the permeated water that has permeated the suction preventing sheet 15 and sucked inside passes through the drain material 19 and the net sheet 18 and enters the water collecting block 16 of the drainage wall 17. The collected water is further passed through a water channel in the drainage wall 17 and sent to a predetermined location (for example, a reservoir or a well) to be continuously processed.

Then, the detail of the drainage wall 17 provided in the said reinforcement | strengthening object site | part 13 equivalent to the summary of this invention is demonstrated below. FIGS. 3 to 7 show an example of the water collecting block 16 constituting the drainage wall 17, and FIGS. 3 to 6 show the water collecting block 16a disposed in the lower layer portion of the drainage wall 17. FIG. FIG. 7 shows a water collecting block 16 b disposed in the uppermost layer portion of the drainage wall 17.

  First, the water collecting block 16a disposed in the lower layer shown in FIGS. 3 to 6 will be described. The water collecting block 16a is a hollow horizontally long rectangular column having both left and right ends opened, and the outer peripheral surface on the upper surface side is opened, and is formed in an approximately U shape in a side view. In addition, a plurality of rectangular water passage holes 22 penetrating from the inside to the outside are provided in the outer wall portion 21a on the lower surface side of the water collecting block 16a and the outer wall portions 21b and 21c on the front side and the rear side (this example). In this case, 6 pieces are arranged side by side in a grid pattern.

  Furthermore, an engaging recess 23 formed by cutting out a part of the upper end portions of the front and rear outer walls 21b and 21c in a step shape is formed in the upper opening portion of the water collecting block 16a over both left and right ends. On the other hand, on the outer surface of the outer peripheral wall portion 21a on the lower surface side of the water collecting block 16a, an engaging convex portion 24 that can be inserted and engaged with the engaging concave portion 23 is integrally formed.

  Next, the water collecting block 16b disposed in the uppermost layer shown in FIG. 7 will be described. The water collecting block 16b, like the water collecting block 16a, is a hollow horizontally long rectangular column with both left and right ends opened, and the outer peripheral surface on the upper surface side is opened and formed in a generally upward U shape in side view. ing. Moreover, the upper surface opening part of this water collection block 16b is closed by attaching the water collection block 16c used as an upper cover.

  A plurality of (six in this example) rectangular water passage holes 26 penetrating from the inside to the outside are formed in the outer wall portion 25a on the lower surface side of the water collecting block 16b and the outer wall portion 25c on the rear side. Has been. The lid-shaped water collecting block 16c is also formed with a plurality (two in this example) of rectangular water holes 27 penetrating from the inside to the outside. The water passage hole 27 of the water collecting block 16 c serving as an upper lid is compared with the water passage hole 26 so as to prevent a person walking on the water collecting block 16 c from getting stuck in the water passage hole 27. It is formed as an elongated hole.

  Further, on the outer surface of the outer peripheral wall portion 25a forming the lower surface of the water collecting block 16b, an engaging convex portion 28 that can be inserted and engaged with the engaging concave portion 23 of the water collecting block 16a is integrally formed. Yes.

  The water collecting block 16a and the water collecting block 16b are about 2000 mm in width in the left-right direction, about 800 mm in height, and about 700 mm in width in the front and rear directions. Each of these dimensions can be changed as appropriate.

  Next, a procedure for constructing the drainage wall 17 using the water collecting blocks 16a, 16b, and 16c configured as described above will be described. First, the lower layer part of the drainage wall 17 is assembled on the base material 14 in the slot 20 using the water collecting block 16a for the lower layer part. Each of the water collecting blocks 16a faces the upper surface opening portion upward, and the ends of the adjacent water collecting blocks 16a, 16a are brought into contact with each other so that the water collecting blocks 16a, 16a,. A long and continuous bowl-shaped lower water collecting block row is formed.

  Next, the other water collecting blocks 16a, 16a... Are placed on the water collecting blocks 16a, 16a... In the first lower layer water collecting block row, and the engaging convex portions 24 of the other water collecting blocks 16a are on the lower side. When the layers are sequentially stacked so as to be inserted and engaged with the engaging recess 23 of the water block 16a and are connected along the bank body 10, a second-stage lower water collecting block row is formed. This is repeated in order. FIG. 2 shows a state where the lower water collecting block rows using the water collecting blocks 16a, 16a.

  When the assembly of the water collecting block row in the lower layer using the lower water collecting blocks 16a, 16a,... Is finished in this manner, the uppermost water collecting block is further provided on the lower water collecting block row by one step. 16b, 16b... Are stacked and connected along the bank body 10 to form the uppermost water collecting block row. Moreover, when the water collecting blocks 16c, 16c, which are lids are attached on the water collecting blocks 16b, 16b, and then the upper surface opening portion is closed, the drain wall 17 continuous along the bank body 10 is formed. The

  Accordingly, in the drainage wall 17 configured in this way, the water collecting block rows are connected in a bowl shape in the left-right direction to form a water channel inside, and the outer wall portion 21a is also formed between the upper and lower water collecting block rows. Are connected to each other through a water passage hole 22 provided in the outer wall portion 25a and a water passage hole 26 provided in the outer wall portion 25a. Therefore, the water drainage wall 17 is collected by the water collecting blocks 16a, 16a, ..., 16b, 16b, ... The permeated water that has flowed into the water can be sent to a predetermined location (for example, a reservoir or a well) through each water channel in the drain wall 17 and continuously processed.

  Thereby, since the permeated water which has permeated the levee body 10 over a wide range can be effectively removed, the functionality can be improved and the stability of the levee can be enhanced. Further, the drainage wall 17 having a desired height and length can be easily obtained by stacking the other drainage block row on one horizontally long catchment block row by inserting and engaging the engaging concave portion 23 and the engaging convex portion 24. Therefore, it is possible to improve functionality and economy.

FIG. 8 is an enlarged cross-sectional view showing a modified example of the drainage wall 17 stacked in the reinforcement target portion of the bank body 10 of the present invention . In this modification, the outer peripheral surface on the upper surface side is replaced with the water collecting block 16a for the lower layer portion that is substantially U-shaped in a side view forming the drainage wall 17 of the reinforcement target portion 13 shown in FIGS. The drainage wall 17 is formed by using the lower water collecting block 16d formed in a substantially square shape when viewed from the side, and the other configurations are the same as those shown in FIGS. The same reference numerals are given to the components, and duplicated explanation is omitted.

  The lower-layer water collecting block 16d is a hollow horizontally long rectangular column with both left and right ends opened, and the lower and outer wall portions 21a and the front and rear outer wall portions in the same manner as the water collecting block 16a. A plurality of rectangular water passage holes 22 penetrating inward and outward are provided in each of 21b, 21c and the outer wall portion 21d on the upper surface side (six in this example).

  Furthermore, an engaging recess 23 is formed continuously on both the left and right ends of the outer wall 21d on the upper surface side of the water collecting block 16d. On the other hand, on the outer surface of the outer wall portion 21a on the lower surface side of the water collecting block 16d, an engaging convex portion 24 that can be inserted and engaged with the engaging concave portion 23 is formed continuously across the left and right ends.

  When the drainage wall 17 is constructed using the lower-layer water collecting block 16d configured in this way, first, the outer wall portion 21d on the upper surface side where the engaging recess 23 is provided is directed upward. And the ends of adjacent water collecting blocks 16d, 16d, etc. are butted against each other and the water collecting blocks 16d are connected in order along the bank 10, thereby forming a first row of elongated and continuous bowl-shaped lower water collecting blocks. .

  Next, the other water collecting blocks 16d, 16d... Are placed on the water collecting blocks 16d, 16d... In the first lower layer water collecting block row, and the engaging convex portions 24 of the other water collecting blocks 16d are on the lower side. When the layers are sequentially stacked so as to be inserted and engaged with the engaging recess 23 of the water block 16d and are connected along the bank body 10, a second-stage lower water collecting block row is formed. This is repeated in order. FIG. 8 shows a state in which the lower-layer water collecting block rows using the water collecting blocks 16d, 16d. Further, in the lower water collecting block row stacked in this manner, the water through holes 22 of the outer wall portion 21a and the water through holes 22 provided in the outer wall portion 21d of the upper water collecting block 16d communicate with each other vertically. Is set.

  When the assembly of the lower water collecting block row using the lower water collecting block 16d is completed in this way, the uppermost water collecting block shown in FIG. 16b, 16b... Are stacked and connected along the bank body 10 to form the uppermost water collecting block row. When the lid-shaped water collecting blocks 16c, 16c,... Are attached on the water collecting blocks 16b, 16b, and the upper surface opening portion is closed thereafter, the drain wall 17 continuous along the bank body 10 is formed. . In addition, when the uppermost water collecting block row is stacked on the lower water collecting block row between the lower water collecting block 16d and the uppermost water collecting block 16b, the uppermost water collecting block 16b. The water passage hole 26 in the outer wall portion 25a and the water passage hole 26 provided in the outer wall portion 25d of the lower water collecting block 16d are set to communicate with each other in the vertical direction.

  Therefore, even in the drainage wall 17 configured in this manner, the water collecting block rows are connected in a bowl shape in the left-right direction to form a water channel inside, and the outer wall portion 21a is also formed between the upper and lower water collecting block rows. The water collecting blocks 16b, 16b, 16c, 16c, 16d are connected to each other by the water holes 22 provided in the outer wall portion 21 and the water passage holes 22 provided in the outer wall portion 21d and the water passage holes 26 provided in the outer wall portion 25a. , 16d, and so on, and the permeated water that has flowed into the drain wall 17 is sent to a predetermined location (for example, a reservoir or a well) through each water channel in the drain wall 17 and continuously processed. Can do.

Thus, the permeate that has permeated over a wide range within the dam 10, it is possible to effectively remove improved functionality, it is possible to enhance the stability of the embankment, functionality resistance and economy Improvement can be achieved.

  It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

  The present invention can also be applied to a bank body reinforcement method and a reinforcement structure other than the well method.

DESCRIPTION OF SYMBOLS 10 Dike body 12 Foundation ground 13 Strengthening object part 14 Base material 15 Suction prevention sheet 16 Water collecting block 16a Lower layer water collecting block 16b Uppermost layer water collecting block 16c Covered water collecting block 16d Lower layer water collecting block 17 Drain wall 20 Groove holes 21a to 21c Outer wall portion 21d Outer wall portion 22 Water passage hole 23 Engagement recess 24 Engagement projection portion 25a to 25c Outer wall portion 26 Water passage hole 27 Water passage hole 28 Engagement projection

Claims (1)

Excavating a predetermined depth of a groove in the base ground of the existing river levee body at a set interval along the river dam body, and being connected and disposed in a horizontally long manner along the groove hole in the groove hole, A water collecting block for use in a well construction method for collecting and discharging osmotic water in a levee body, the water collecting block having a rectangular shape with a hollow horizontal shape and having an engaging recess on one side. And an engaging projection that can be inserted and engaged with the engaging recess on the other surface side, and the engaging projection of one water collecting block is inserted into the engaging recess of another water collecting block. In the drainage structure in the well construction method for embankment reinforcement that is built by stacking together,
A site to be strengthened is defined in the foundation ground of the river levee body, and the site to be reinforced comprises a lower part of the inner slope of the dam body and a foundation ground of a peripheral part that follows this, and the foundation ground is defined as the dam body. Excavating a slot of a certain depth at a predetermined interval along the base, placing a base material made of a concrete material on the bottom of the slot, and further covering the inner surface of the slot with a suction prevention sheet, In addition, the water collecting blocks are arranged side by side along the bank body on the foundation material from above the suction prevention sheet to form a drain wall by stacking a plurality of stages, and further, the outside of the drain wall is a net sheet. In addition to covering the drain wall, drain material excellent in water permeability is inserted into the outer slope side and the inner slope side of the drainage wall to fill the gap between the slots, and to prevent the permeation flow generated in the foundation ground of the site to be reinforced. Low strength of foundation ground due to piping phenomenon etc. , Drainage structure in the well construction method for embankment reinforcement, characterized in that to be able to eliminate the subsidence to prevent destruction of the embankment.

Images