JP2017155404A - Natural ground reinforced earth method and reinforcing material used therefor - Google Patents

Abstract

The present invention provides a natural ground reinforced earth method and a reinforcing material used therefor, in which a sealing material can be discharged from an arbitrary location while the reinforcing material is disposed in the natural ground, and drainage from the ground can be performed conversely. .
SOLUTION: Ground reinforcement that aims to stabilize anti-earth pressure structures, embankments, cut slopes, etc. by arranging reinforcing materials in multiple levels horizontally or at a predetermined installation angle in the natural ground 6 from the slope or retaining wall side. In the earthwork method, the reinforcing material is an injection board 1 having a plurality of elongated holes that are formed in a flexible and elongated plate shape and extend in the longitudinal direction and can be used as a fluid transfer passage. From the state in which the injection boat is inserted into a placement pipe placed in a natural ground or is placed in the natural ground together with the placement pipe, the rear end 1a of the board is formed into a slope or a retaining wall by pulling out the placement pipe. It is left in the natural ground in a manner exposed to the outside.
[Selection] Figure 1

Description

  The present invention relates to a natural ground reinforced earth method useful as a measure for preventing collapse of natural slopes and slopes, and a reinforcing material used therefor.

  As exemplified in Patent Documents 1 and 2, the natural earth reinforcement earth method is used to prevent the natural slopes and slopes from collapsing, to strengthen the retaining wall ground, and to support the retaining ring. In order to improve the stability of the natural ground, it is arranged in multiple stages and restrains the deformation by exerting a resistance to the reinforcing material along with the deformation of the natural ground.

  FIG. 9A shows a natural ground reinforcing earth method disclosed in Patent Document 1, in which a bar-shaped reinforcing material 1 is placed to stabilize a natural slope or a slope of embankment. The main part is formed in a tubular shape such as a steel pipe as the reinforcing material 1 as in (b), and a sharpened portion 11a for dividing into the embankment of the natural ground at the time of placing is formed near the tip, and the rear end A first step of placing the reinforcing material 1 on a natural ground, and a placement step, in which a discharge port 11e for discharging grout press-fitted from the side into the periphery of the reinforcing material is formed on the side surface The reinforcing material 1 is pressed into the interior from the rear end of the reinforcing material 1 so that the inside of the reinforcing material is filled and discharged into the periphery of the reinforcing material through the discharge port 11e on the side surface of the reinforcing material and penetrates into the surrounding embankment to be cured. By doing so, the reinforcing material 1 and the ground inside the reinforcing material and the embankment around the reinforcing material are integrally fixed on the ground.

  FIG. 10 (a) is a natural ground reinforcing earth method disclosed in Patent Document 2, and is an example in which the natural ground 31 is applied to the side slope 34 of the tunnel. The main part is a composite pipe in which an annular part 21 and a hollow part 22 are formed as in (b), and a rod 17 provided with an injection nozzle 27 at the tip of the annular part 21 is mounted on a boring drilling device. Then, positioning in the drilling direction, supplying high-pressure water to the injection nozzle 27 and jetting high-pressure jet water in the drilling direction, drilling to the ground with a boring drilling device, After the core material 30 is inserted into the hollow portion and the tip of the core material is driven into the ground, a drawing step of drawing the rod 17 along the core material 30 for a predetermined distance, and a high-pressure curing agent is supplied to the injection nozzle 27. A pile-like improved body 32 having a core material 30 is formed by alternately and repeatedly performing an injection process of injecting a curing agent at a high pressure while rotating the rod 17 and injecting it into the ground.

JP 2011-252319 A Japanese Patent No. 2875064

  The reinforcement materials in Patent Documents 1 and 2 are configured as a deterrent work, and when performing a restraint work that suppresses the increase in pore water pressure due to drainage, it must be designed and constructed separately from the natural ground reinforced earth method using the reinforcement material. I must. In other words, in stabilization of the natural ground and seismic design, it is important to suppress the pore water pressure in the natural ground to the design value even during heavy rain by performing suppression work with drainage as well as suppression work with reinforcing materials.

  The present invention has been made to solve the above-described problems. The purpose of the present invention is to provide a ground-reinforced earth method and a reinforcing material used therefor, in particular, a sealant that can be discharged from an arbitrary place in a state of being placed in the ground and can also be drained from the ground. There is. Other purposes will be clarified in the description below.

  In order to achieve the above-mentioned object, the invention of claim 1 is arranged such that the reinforcing material is arranged horizontally or at a predetermined installation angle in the natural ground from the slope or retaining wall side, such as an anti-earth pressure structure, embankment, cut slope, etc. In the earth-and-ground reinforced earth method for stabilization, the reinforcing material is a flexible elongated plate-like shape, and is formed in a plate thickness and has a plurality of elongated holes that extend in the longitudinal direction and can be used as fluid transfer passages. An injection board having the rear end of the board by inserting the injection boat into a placement pipe placed in a natural ground or by placing the injection boat in the natural ground together with the placement pipe. Is left in the ground in a manner exposed to the outside of the slope or retaining wall.

  The above injection board is similar to the resin drain material disclosed in Japanese Patent No. 4363996, etc., in that it has a flexible elongated plate shape and has a plurality of long holes formed in the plate thickness. However, the resin drain material does not function unless both side surfaces are water-permeable, but the injection board of the present invention is not limited to water-impermeable and may be water-permeable.

The present invention as described above is more preferably embodied as in claims 2 to 6.
(A) With the injection board left in the ground, the seal material is transferred from the rear end of the board through one or more long holes among the plurality of long holes, and communicated with an appropriate position of the long hole. It is the structure which discharges in the natural ground from the injection port provided in this way (Claim 2). The inlet includes an opening at the tip of the long hole. In addition to cement milk, the sealing material includes ground improvement materials, solutions containing other chemical components, fluids, and the like.
(A) A structure is provided that includes a guide member that is disposed in the long hole from the injection port and guides the seal material flowing along the long hole to outside.

(C) In the state where the injection board is left in the natural ground, moisture in the natural ground is provided at an appropriate position of the long hole and communicated to the outside through one or more long holes among the plurality of long holes. It is the structure which flows in into this long hole from a discharge port, and drains from the said board rear end (Claim 4). The outlet includes an opening at the tip of the long hole.
(D) It is disposed in the elongated hole from the discharge port, allows moisture in the natural ground to flow into the elongated hole, and restricts the flow of the elongated hole to the front end side and flows to the rear end side. It is the structure which has the guide member to make it (Claim 5).

Moreover, Claim 6 specifies the reinforcing material (what was described in any one of Claim 1 to 5) which consists of an injection board used for the above natural ground reinforcement earthwork method. This reinforcing material includes those that are placed in the natural ground by the natural ground reinforcement earth method and those that are planned to be used for the natural ground reinforcement earth method. Specifically, it is a reinforcing material for a natural ground reinforced earth construction method having the following configuration.
(1) Reinforcement material used in the earth-reinforced concrete method, which is arranged in multiple stages in the ground from the slope or retaining wall side or at a predetermined installation angle to stabilize the earth pressure structure, embankment, cut slope, etc. The reinforcing material is an infusion board having a plurality of elongated holes formed in a plate thickness and extending in the longitudinal direction and usable as a fluid transfer passage. In a state in which the rear end of the board is exposed to the outside of the slope or the retaining wall by pulling out the placement pipe from a state where it is inserted into the placement pipe placed in the ground or placed in the ground with the placement pipe. It is the structure left in the natural mountain.
(2) In the state where the injection board is left in the ground, the sealing material or / and the ground improvement material are transferred from the rear end of the board through one or more long holes among the plurality of long holes, It is the structure which can be discharged in the natural ground from the inlet provided so that it may communicate with the appropriate position of a long hole.
(3) In the state where the injection board is left in the ground, through the one or more long holes among the plurality of long holes, moisture in the ground is provided at an appropriate position of the long hole and is exposed to the outside. It is the structure which can flow in into this long hole from the communicating discharge port, and can drain from the said board rear end.
(4) The injection board is arranged in the long hole from the injection port or the discharge port, and guides the sealing material or / and the ground improvement material flowing along the long hole to the outside, or moisture in the natural ground. And a guide member that restricts the flow of the long hole to the front end side and flows to the rear end side.

  In the invention of claim 1, the reinforcing member is made of a flexible elongated plate-like injection board, and is left by being pulled out from a state where the reinforcing member is inserted into the placing tube placed as in the first embodiment. In the same manner as the drain construction method using the resin drain material as in the second embodiment, it is placed and left. In the remaining state, the injection board, which is a reinforcing material, has a plurality of long holes for fluid transfer extending in the longitudinal direction in the plate thickness, and therefore, using one or more long holes, the sealing material is placed around the board. It is easy to create a discharge fixing part and drain the water in the natural ground to the ground surface side. In short, as a measure to stabilize natural slopes and slopes and prevent collapse, it is possible to have both a depressing work by placing an injection board and discharging a sealing material, and a depressing work by drainage. In addition, the injection board is superior to the steel material which is a conventional reinforcing material.

  In the invention of claim 2, the sealing material is transferred from the rear end side of the one or more long holes and discharged into the ground from an injection port provided to communicate with an appropriate position of the long holes. An integrated fixing portion can be created within the thickness, around the injection port, and around the injection board. In this case, in the invention of claim 3, the sealing material transferred to the long hole can be reliably discharged from the inlet to the periphery of the board by the guide member.

  In the invention of claim 4, the moisture in the natural ground flows into the long hole from the discharge port of the injection board, and is drained from the long hole to the outside of the natural ground through the rear end opening. In this case, according to the fifth aspect of the present invention, the water that has flowed into the elongated hole is prevented from flowing to the tip side by the guide member and can be drained efficiently.

  The invention according to claim 6 is the injection board according to any one of claims 1 to 5, and the advantages as described above can be obtained by being used in the natural ground reinforcing earth method.

It is a schematic diagram at the time of applying the natural ground reinforcement earthwork method of the 1st form, (a) is a schematic sectional view and (b) is a partial front view seen from the A direction of (a). FIG. 1 shows an operation procedure until the injection board is left in the ground in the natural ground reinforcement earth method of FIG. 1, (a) is a schematic diagram showing a drilling process, (b) is a drilling completion and an inner rod is pulled out, The schematic diagram which shows an internal cleaning process, (c) is a schematic diagram which shows an injection board insertion process. The operation procedure of the natural ground reinforced earth construction method following FIG. 2 is shown, (a) is a pipe drawing / sealing material filling step, (b) a sealing material filling completion and cracking step, and (c) is an improved body creation step. The whole structure of the said injection | pouring board is shown, (a) is a side view, (b) is the model top view seen from the B direction of (a). (A) is a schematic perspective view which shows the guide member integrated in the said injection | pouring board, (b) and (c) are typical sectional drawings which show the effect | action of the injection | pouring board of (a). It is a schematic diagram at the time of applying the natural ground reinforcement earthwork method of the 2nd form, (a) is a schematic sectional view and (b) is a partial front view seen from the A1 direction of (a). FIG. 5 shows an operation procedure until the injection board is left in the ground in the natural ground reinforcement earth method shown in FIG. 5, (a) is a schematic diagram showing a positioning process of the placing pipe, and (b) is a placing process of the placing pipe. It is a schematic diagram which shows. FIG. 6 shows the operation procedure of the natural ground reinforced earth method following FIG. 6, (a) is a schematic diagram showing the cutting process of the injection board and the discharge process of discharging the sealing material with the middle injection board, and (b) is the upper injection. It is a schematic diagram which shows the discharge process which discharges a sealing material with a board. (A) And (b) is explanatory drawing which shows FIG.1 and FIG.2 of patent document 1. FIG. (A) And (b) is explanatory drawing which shows FIG.5 and FIG.6 of patent document 2. FIG.

  Embodiments to which the present invention is applied will be described below with reference to the drawings. In this description, the outline of the natural ground reinforced earth method, the reinforcing material, and construction examples 1 and 2 will be described in this order. In the drawings, details are omitted or schematically illustrated.

(Summary) The target natural ground reinforced earth method is, for example, reinforcement of embankment or its retaining wall as shown in FIG. 1, stabilization of gentle slope slope of natural ground or existing embankment as shown in FIG. It is suitable for stabilization of natural slopes and slopes and measures for preventing collapse, as shown in FIG. That is, the “natural mountain” of the present invention is used in a broad sense including these various parts, as exemplified by the natural mountain 6 in FIGS. 1 to 3 and the natural mountain 6A in FIGS. . The feature of the construction method is that the injection board 1 that enables deterrence and suppression work as a reinforcing material is used, and the injection board 1 is arranged in multiple levels horizontally or at a predetermined installation angle in the natural ground from the slope or retaining wall side. It is intended to stabilize anti-earth pressure structures, embankments and cut slopes.

(Reinforcing Material) The injection board 1 is a flexible elongated plate as shown in FIGS. 4 and 5, and is formed in a plate thickness and extends in the longitudinal direction and can be used as a plurality of lengths that can be used as a fluid transfer passage. A hole 12 is provided. That is, the injection board 1 defines a plurality of long holes 12 extending in a groove shape in the longitudinal direction between the upper and lower surfaces 11 and 11. In this case, the injection board 1 may be composed of, for example, a core material that is formed in a concavo-convex shape in the plate width direction, and upper and lower surfaces 1 and 11 joined to both sides or upper and lower surfaces of the core material. The material may be a resin such as thermoplastic, rubber, or the like. The board width dimension is not limited in theory, but is 3 to 15 cm, more preferably about 5 to 10 cm in relation to a drill pipe or the like which is a placement pipe described later. The thickness is preferably about 0.5 to 2 cm.

  The above injection board 1 can be handled in a state of being wound around a supply reel 46 because it is flexible as shown in FIG. It can be unwound from the reel 46 and cut at an arbitrary length. Further, the injection board 1 has a sealing material that flows along the long hole 12 through the long hole 12 (the main purpose is to fill a gap generated in the process of leaving the injection board in the ground) And a plurality of inlets 13 for discharging the ground improvement material to the outside, and conversely, the water in the ground is made into the long holes 12. A discharge port 14 is provided along the elongated hole 12 to allow drainage to the outside of the slope and retaining wall. The inlet 13 and the outlet 14 have substantially the same configuration, but are provided so as to communicate with different long holes 12.

  That is, as illustrated in FIG. 5, the injection port 13 and the drain port 14 are provided with a window leading to the long hole 12 on the upper and lower surfaces 11, 11 of the board, and are disposed in the long hole 12 from the window. The guide member 2 that guides the sealing material or the improvement material transferred along the outside to the outside, or the guide member 2 that guides moisture in the natural ground into the long hole 12 from the window. The guide member 2 may be omitted, and the window itself may be used as the inlet 13 or the outlet 14. As the hole treatment of the long hole 12, for example, it is preferable to attach a hole closing cap to the tip 1b of the injection board 1, or close a hole portion or tip opening that is not used as a passage among the long holes by partial melting or the like. .

  In addition, the injection port 13 is used to form the target improvement body 8 and the fixing portion 7A in a state where the injection board 1 is placed at a predetermined installation angle or substantially horizontally in a ground such as embankment as shown in FIGS. It is provided to be scattered at suitable places. On the other hand, the discharge port 14 is usually provided so as not to overlap the improved body 8 of FIG. 1 and the fixing portion 7A of FIG.

  The guide member 2 has, for example, a substantially U shape, that is, a bottom wall 20 and both side walls 21, and is attached to the injection boat 1 by being pushed into the one window, the long hole 12, and the other window. In this case, it is preferable that the guide member 2 is attached to the opposing portion in which the side walls 21 define the long hole 12 via an adhesive or the like, in order to prevent inadvertent detachment or displacement. The material of the guide member 2 is resin, rubber, and the like similar to those of the injection boat 1.

  FIG. 5B shows a discharge state of the sealing material or the improvement material transferred to the long hole 12 in the mounted state of the guide member 2. The sealing material and the ground improvement material transferred along the long hole 12 enter the inside 23 of the guide member 2 and are discharged outside from the upper and lower openings. (C) shows the flow of moisture in the natural ground. Moisture in the natural ground flows into the inside 23 of the guide member 2 from the upper and lower openings, flows along the long hole 12, and is discharged from the board rear end 1a.

  In addition, it is preferable not to block the above drain port 14 with mud etc. by covering with the filter member 15 as shown with the broken line in FIG.5 (c). In the configuration as shown in FIG. 6, the guide member 2 may be omitted, and the upper and lower surfaces 11 joined to both sides of the core material may be configured with a water permeable material. In this case, in the filling boat 1, the water in the embankment and the natural ground can flow into the long hole in the board portion excluding the fixing portion 7 </ b> A.

(Construction Example 1) In this construction example 1, as a concrete example of the natural ground reinforcement construction method, the above-described injection board is multi-staged on a predetermined portion of embankment or the like (hereinafter referred to as natural ground 6) with reference to FIGS. The operation in the case where the fixing portion and the improved body are respectively constructed in order to fix the pouring boat placed in the ground and to fix the ground in the ground will be described. That is, in this construction example 1, the positioning and drilling process of FIG. 2A, the inner rod drawing and hole cleaning process of FIG. 2B, the injection board insertion process of FIG. 3C, FIG. ) Drill pipe drawing and sealing material filling process, cracking process of FIG. 5B, and improved body formation process of FIG.

  Here, the construction machine 3 is called a rotary percussion drill, and is supported so as to be movable back and forth with respect to a guide shell 32 supported so as to be capable of turning and tilting on the carriage main body 31, and the whole is a carriage. 30 is movable. The drill mechanism is of a double pipe type, and includes a drill pipe 34, a ring bit 34a provided at the tip of the drill pipe, an inner rod 35 inserted in the drill pipe 34, and an inner bit 35a provided at the tip of the inner rod. And a swivel 36 incorporated on the rear side of the drill pipe 34, a drifter 37 as a rotary impact driving mechanism, and the like.

  The injection board 1 to be used is cut to a desired length as illustrated in FIG. 4, and the injection port 13 and the discharge port 14 are provided at the target location, or the guide member 2 is attached to the length. The distal end side opening of the hole 12 is closed as necessary. On the other hand, although not shown in the construction area, a sealing material supply source for producing cement milk and the like, a pump for feeding the produced sealing material, a pump for feeding cracking water, etc., and an improvement material for producing ground improvement material A supply source and a pump for pumping the manufactured improved material are prepared. In that case, the sealing member of a sealing material supply source, the water for cracking, and the ground improvement material of an improvement material supply source may be pumped by a switching system using a single pump.

  In the positioning and drilling step of FIG. 2A, after the construction machine 3 is moved to the target board placement location, the double pipe (drill pipe 34 and inner rod 35) of the drill mechanism moves the guide shell 32 and the like. And positioned at a substantially horizontal or predetermined angle in a notch 5a provided in the retaining wall 5 of the natural ground. The double pipe is driven to the design length in the natural ground by driving the drifter 37.

  In the inner rod pulling out and in-hole cleaning step of FIG. 2B, the drill pipe 34 is separated from the drill mechanism and the inner rod 35 is pulled out from the drill pipe 34. Thereafter, the inside of the drill hole of the drill pipe 34 is washed with, for example, high-pressure jet water. This cleaning process may be omitted.

  In the injection board insertion step of FIG. 2 (c), the injection board 1 formed in a predetermined length as shown in FIG. 4 is inserted and disposed in the hole of the drill pipe 34 that is placed in the natural ground. In this case, the drill pipe 34 having a length corresponding to the injection board 1 is used. That is, the injection board 1 has such a length that the rear end 1a protrudes outside the drill pipe in a state where the injection board 1 is inserted into the hole of the drill pipe 34.

  In the drill pipe drawing and sealing material filling process of FIG. 3A, illustration is omitted, but after the drill pipe 34 is connected again to the drill mechanism of the construction machine 3, it is pulled out from the ground. At that time, the sealing material of the sealing material supply source is pumped into the drill pipe 34 by the pump through the swivel 36 and discharged into the ground. In this case, the sealing material is discharged and filled so as to fill a space generated by pulling out the drill pipe 34, and is finally formed as a fixing portion 7 that covers the injection board 1 as shown in FIG. Thereafter, the construction machine 3 is moved to the next board placement location.

  In the cracking step of FIG. 3B, since the injection board 1 is covered with the fixing unit 7 and the injection port 13 and the drain port 14 are blocked in the previous step, the aqueous solution is pumped into each long hole 12 at a high pressure. Then, a break is made in the corresponding portion of the fixing unit 7 by spraying from the injection port 13 and the drain port 14. In this operation, first, a dedicated jig or joint 25 is attached to the rear end 1a of the injection board. The joint 25 has a connecting pipe portion connected to a plurality of target long holes 12, and accepts cracking water, that is, high-pressure water through the holder 28, so that it can be pumped from the connecting pipe portion to the corresponding long hole 12 at high pressure. .

  That is, in this process, high-pressure water is jetted from the injection port 13 and the drain port 14 toward the fixing unit 7 in a state where the fixing unit 7 has low strength, that is, no strength is expressed, and the jetting force of the fixing unit 7 is A crack is made in the corresponding part so that the improved body 8 can be created in the next process, or the water in the natural mountain can easily flow into the long hole 12 from the drain port 14.

  In the improved body creation step of FIG. 3C, a dedicated joint 25A is attached to the rear end 1a of the injection board instead of the joint 25. In addition, the joint 25 has a connecting pipe part connected to the long hole 12 provided with the inlet 13 and the drain port 14 among the plurality of long holes 12. On the other hand, the joint 25 </ b> A has a connecting pipe portion connected to the long hole 12 in which only the injection port 13 is provided among the plurality of long holes 12. Then, the joint 25 </ b> A accepts the improvement material of the improvement material supply source through the holder 28 through the holder 28, and makes it possible to pressure-feed from the connecting pipe portion to the corresponding long hole 12.

  That is, the improved body 8 is formed by discharging the improved material from the connecting pipe portion into the long hole 12 and from the inlet 13 (the partitioning guide member 2) to the outside of the board. In FIG. 4 (c), for the sake of easy understanding, in the example of the injection board 1 of FIG. 4, the improvement material is discharged into the natural ground from the two injection ports 13 at the front of the tip. It is the figure which created 8. After that, as shown in FIG. 1, each notch 5a is backfilled by the solidified material backfill material 9, and the joint 25 and the holder 28 are removed and mounted on the next injection board. Each of the above steps is repeatedly performed from the first to the nth in the lower stage, from the first to the nth in the middle stage, and from the first to the nth in the upper stage.

  In FIG. 1A, as described above, a number of injection boards are left in the natural ground 6 such as an existing embankment with the rear end 1a exposed outside the natural ground, and the fixing portion 7 and the improvement portion 8 The completed state is shown. In each injection board 1, the water in the ground 6 such as an existing embankment is discharged through the one or more long holes 12 provided with the discharge ports 14 (guide members 2) among the plurality of long holes 12. From 2), it flows into the long hole 12 and is drained from the exposed rear end 1a. Therefore, in this natural ground reinforcement earth work method, it can serve as both the deterrent which mainly reinforces by the injection board 1 and the sealing material 6 which were left, and the depressant mainly which drains. Furthermore, the improvement effect by the improvement body 8 is also acquired.

(Construction Example 2) In the construction example 2 shown in FIGS. 7 and 8, several tens of meters of the board raw material 10 wound around the construction machine 4 and the supply reel 46 are used, and the preparation or preliminary process, positioning process, board A placement process, a board cutting process, an injection preparation process, and a discharge process for discharging the sealing material into the ground are performed.

  Here, the construction machine 4 includes a base machine 40, an arm 41 and a support rod 42 that can be pivoted and tilted connected to and supported by the base machine 40, and a guide member that is connected and supported by the arm 41 and the support rod 42. 43 and a drive head 44 that can move along the guide member 43. Further, the supply reel 46 mounted on the rear stage of the base machine 40, the driving tube 45 moved along the guide member 43 by the drive head 44, and the supply reel 46 provided at the rear end of the guide member 43. A guide means 47 for guiding the board raw material 10 drawn from the guide pipe 45 to the placement tube 45, and a cutting means 48 provided at the tip of the guide member 43. On the other hand, the placing tube 45 has a narrowed tip and a slit-like opening. Then, the board raw material 10 is inserted into the tube from the rear end with respect to the placement tube 45 and is drawn out from the front end opening. An anchor 15 is attached to the drawing end.

  First, in the preliminary process, the inlet 13 and the drain 14 are attached to the board raw material 10 wound around the supply reel 46 at the construction site. In this operation, for example, as shown in FIG. 8 (b), the board raw material 10 is drawn out from the tip of the placing tube 4 by a predetermined length, the window is formed, and the guide member 2 is inserted and fixed from the window. Thus, the injection port 13 and the drain port 14 are formed. Thereafter, the board raw material 10 is rolled up as shown in FIG. 7A, and the anchor 15 is attached to the drawn end where the anchor 15 is drawn from the placing tube 4.

  In the positioning step, as shown in FIG. 7A, after the construction machine 4 is moved to the target board placement location, the placement tube 45 is positioned and arranged substantially horizontally or at a predetermined angle via the guide member 43.

  In the board placing process, the casting tube 45 is driven by a predetermined distance via the drive head 44 as shown in FIG. 7B, and then the injection board raw material 10 inserted into the placing tube as shown in FIG. 8A. With the portion (the portion corresponding to the injection board 1) left in the ground, the placing tube 45 is pulled out, and the rear end 1 a side is exposed outside the slope of the natural ground 6.

  In the board cutting step, the exposed rear end 1 a is cut by the blade 49 of the cutting means 48. Subsequently, the injection board raw material 10 is provided with the injection port 13 and the discharge port 14 in the state of being drawn out from the placement tube 45 as shown in FIG. It is attached. Thereafter, the construction machine 4 is moved to place the placement tube 45 at the next board placement position.

  In the injection preparation process, a dedicated jig or joint 25 is attached to the rear end 1a of the injection board as shown in the middle stage of FIG. 8A and the upper stage of FIG. 8B. The joint 25 has a connecting pipe portion connected to the target one or more long holes 12, receives a sealing material such as cement milk sent from the sealing material supply source via the holder 28, and receives the sealing pipe from the connecting pipe portion. It can be transferred to the long hole 12.

  In the sealing material discharge process, the sealing material is discharged from each inlet 13 into the ground. In other words, the sealing material of the sealing material supply source is pumped to the holder 28 through the hose at a predetermined pressure by the pump, and then from the connecting pipe portion of the joint 25 through the target long hole 12 and from the inlet 13 (guide member 2). It is discharged into the ground. The discharged sealing material is formed as a predetermined large fixing portion 7 </ b> A around the injection port 13 in the injection board 1. The fixing portion 7A is integrated into the transferred long hole 12, the injection port 13 (partitioned guide member 2), and the board outer surface. Thereafter, the joint 25 and the holder 28 are removed and attached to the next injection board 1. Each of the above steps is repeatedly performed from the first to the nth in the lower stage, from the first to the nth in the middle stage, and from the first to the nth in the upper stage.

  FIG. 6A shows the completion of a large number of injection boards being left in the ground with the rear end 1a exposed to the outside of the natural ground 6A such as embankment, that is, the slope, and the fixing portion 7A has been created. Indicates the state. In the remaining state of each injection board 1, the water in the ground 6 </ b> A flows into the long hole 12 from the discharge port 14 (guide member 2) and is drained from the exposed rear end 1 a. . Therefore, in this natural ground reinforcement earth work method, it can serve as both the suppression work by the pouring board 1 and fixing part 7A which were laid, and the suppression work by drainage. Note that the above fixing portions 7 and 7A may be referred to as seal portions.

  In addition, the above construction examples 1 and 2 do not restrict | limit the natural ground reinforcement earthwork method of this invention at all. The present invention only needs to include technical elements specified in each claim, and the details can be variously changed and developed as necessary. As an example, the construction machines 3 and 4 are changed or improved as necessary. Moreover, as a natural ground reinforcement earthwork method, the improved body 8 may be omitted.

1 ... Injection board (12 is a long hole, 1a is the rear end, 1b is the front end)
2 ... Guide member (20 is the bottom wall, 21 is the side wall)
3 .... Construction machine 4 .... Construction machine 5 .... Retaining wall 6 .... Mt. Earth such as embankment 6A ... Mt. Earth such as embankment 7 .... Fixing part 7A ...・ Fixing part 8... Improved body 9... Backfilling material 10 .. board raw material 11 .. top and bottom surface 12 ... long hole 13 ... inlet 14 ... drainage port 15. ..Filtration member 25 ... Joint 28 ... Holder 35 ... Drill pipe (corresponding to driving pipe)
45 ... Laying pipe 46 ... Supply reel

Claims (6)

In the natural ground reinforcement earth construction method that stabilizes the anti-earth pressure structure, embankment, cut slope, etc. by arranging the reinforcing material in multiple levels in the natural ground from the slope or retaining wall side at a predetermined installation angle,
The reinforcing member is an infusion board having a plurality of long holes that are flexible and elongated plate-like, and are formed within a plate thickness and extend in the longitudinal direction and can be used as a fluid transfer passage.
From the state in which the injection boat is inserted into a placement pipe placed in a natural ground, or in the natural ground together with the placement pipe, the rear end of the board is moved outside the slope or retaining wall by pulling out the placement pipe. A natural ground reinforcement earth method characterized by being left in the natural ground in an exposed manner.   In a state where the injection board is left in a natural ground, a sealing material is transferred from the rear end of the board through one or more long holes among the plurality of long holes, and is communicated with an appropriate position of the long hole. 2. The earth-reinforcement earth method according to claim 1, wherein the earth-reinforcing earth is discharged from the inlet into the earth.   3. The natural ground reinforcement according to claim 2, further comprising a guide member that is disposed in the elongated hole from the inlet and guides a sealing material that flows along the elongated hole to the outside. Earthwork method.   In the state where the injection board is left in the natural ground, water in the natural ground is provided at an appropriate position of the long hole through one or more long holes among the plurality of long holes, and is discharged from the discharge port. 4. The natural ground reinforced earth method according to claim 1, wherein the earth flows into the elongated hole and drains from the rear end of the board.   It is arrange | positioned in the said long hole from the said discharge port, the water | moisture content in a natural ground is allowed to flow in into this long hole, and the flow to the front end side of the said long hole is controlled so that it may flow to the rear end side. 5. The natural ground reinforced earth method according to claim 4, further comprising a guide member.   The reinforcing material used for the natural ground reinforcement earthwork method described in any one of Claims 1-5.

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