JP4643234B2 - Wall building apparatus and method around pipe - Google Patents

Description

  The present invention relates to a wall body construction device and a construction method around a pipe for constructing a wall body from the inside of the pipe around the pipe laid in the ground.

  Conventionally, a wall is constructed around a pipe laid in the ground for the purpose of water shielding and the like. For example, in Patent Document 1 below, in order to prevent the occurrence of a disaster such as a break of the levee due to the passage of water between the outer periphery of the culvert pipe that is pierced in the river levee and the ground, It is described that an annular wall (water-impervious wall) is constructed around the pipe.

  FIG. 13 is a diagram for explaining the wall construction situation of Patent Document 1. In FIG. First, in order to pierce and lay the dredger pipe Z by the propulsion method inside the embankment T, as shown in FIG. 13A, the start shaft H1 and the reach shaft H2 on the embankment N side and the river K side of the embankment T Then, the ground G is excavated from the starting shaft H1 toward the reaching shaft H2, and the pipe Z is propelled to be sequentially added. When the dredging pipe Z is laid through the embankment T, a curable backfill material U is injected into the gap Sa between the dredging pipe Z and the ground G as shown in FIG. When the injected backfill material U is hardened, it is divided in order to strengthen the ground G around the split connection ring Rg previously installed in the connecting portion between the vertical pipes Z and to prevent the penetration of groundwater into the periphery. Improving the ground around the connection ring Rg. In the ground improvement, as shown in FIG. 13 (c), the injection pipe 51 provided in the ground improvement apparatus 50 installed in the dredging pipe Z projects into the ground G through the injection hole (not shown) formed in the split connection ring Rg. Then, the grout Ya is injected by step injection from the injection tube 51 into the ground G. At that time, the grout Ya is injected over the entire 360 ° range around the soot tube Z.

  Thereafter, when the injected grout Ya is hardened, the ground improvement portion P is formed around the split connection ring Rg. Therefore, the split connection ring Rg is dismantled and removed as shown in FIG. 13 (d). X is formed. Then, the excavation arm 53 provided in the ground excavator 52 installed in the dredging pipe Z is projected from the opening X to the ground improvement section P and is annularly formed in the ground improvement section P while turning in the circumferential direction of the dredging pipe Z. The groove M is excavated and formed. At this time, since the periphery of the split connection ring Rg is strengthened by the formation of the ground improvement part P and the penetration of groundwater to the periphery is prevented, the ground pipe Z can be formed without causing the collapse of the ground G or the penetration of groundwater. On the other hand, an annular groove M can be formed perpendicularly. And if the groove | channel M of the predetermined depth is formed in the ground improvement part P, as shown in FIG.13 (e), the water stop plate 54 will be inserted in the groove | channel M, and the several water stop plate 54 will be made into the dredging pipe Z Fix it sequentially in the circumferential direction. When the water stop plate 54 has been installed in an annular shape around the soot tube Z, the grout Yb is injected and filled into the groove M as shown in FIG. Thereafter, when the injected grout Yb is cured, the water blocking plate 54 is embedded and fixed in the groove M, and the construction of the annular wall body (water-impervious wall) Wb around the tub tube X is completed.

  According to the above, since the annular groove M can be formed perpendicular to the dredging pipe Z without causing the collapse of the ground G or the penetration of groundwater, the grout Yb injected therein is hardened in a homogeneous state, A wall body Wb having high water shielding performance can be constructed around the pipe Z. For this reason, without inserting the water stop plate 54 into the groove M, only the grout Yb is injected, filled, and hardened to form a wall.

Japanese Patent No. 2929190

However, in Patent Document 1, the ground improvement device 50 injects grout Ya into the ground G to form the ground improvement portion P, and then the excavator 52 excavates and forms the groove M in the ground improvement portion P. Since the grout Yb is injected and filled in the formed groove M, there is a problem that the process of constructing the wall body Wb has three stages, and costs and work time are required. In addition, two devices, the ground improvement device 50 and the excavator 52 , are required, and these must be installed or removed from the inside of the culvert pipe Z, respectively. There is a problem.

  The present invention solves the above-mentioned problems, and the problem is to construct a wall body with high water-blocking performance around the pipe laid in the ground, reduce the cost and shorten the construction period. An object of the present invention is to provide a wall body construction apparatus and method around a pipe that can be shortened.

A wall construction apparatus around a pipe according to the present invention is a pipe that constructs a wall around a pipe from the inside of the pipe through an annular opening formed in the pipe laid in the ground without going through a ground improvement process. A surrounding wall construction apparatus, comprising: an isolation member that closes an opening and isolates the ground from the inside of a pipe; a blade for excavating the ground at a tip; and a discharge for discharging a hard wall construction material. A boring rod provided with an outlet, a projecting and retracting means for projecting the boring rod into and out of the ground through the isolation member and the opening, a rotating means for rotating the boring rod about the axis of the boring rod, and the boring rod Swiveling means for swirling the pipe in the circumferential direction of the pipe. The boring rod pushes the boring rod into the ground, and the rotating means rotates the boring rod. The boring rod forms a hole in the ground with a blade, and the wall material is discharged from the discharge port to remove the wall. Fill the hole with wall material.

  According to such a configuration, the boring rod is pushed out from the inside of the pipe into the ground through the separating member and the opening by the intruding means, the boring rod is rotated by the rotating means, and the wall material is discharged from the discharge port of the boring rod. Thus, the wall material can be filled in the drilling hole while making the drilling hole in the ground. Then, by repeating such drilling step by turning the boring rod in the pipe circumferential direction by the turning means, an annular groove composed of a plurality of continuous drilling holes is formed around the pipe. be able to. Furthermore, after that, the annular wall body can be constructed around the pipe by curing the wall material in the formed groove.

  At the time of the above, the opening of the pipe is closed by the separating member, and the wall material is filled in the drilling hole while making the drilling hole in the ground by the boring rod, so that a drilling hole in a closed space is formed around the pipe Then, the wall material filled in the hole is pressed against the hole, and an annular groove can be formed perpendicular to the pipe without causing collapse of the ground or infiltration of groundwater. it can. Further, since the boring rod is rotated, the excavated ground soil and the discharged wall material can be agitated in the drilling hole and uniformly mixed. Therefore, the structural wall material hardens without diffusing into the ground in the groove, and it becomes possible to construct an annular wall body having a high uniform water shielding performance around the pipe. As a result, it is not necessary to perform the ground improvement process as in Patent Document 1, and since the groove excavation forming process and the filling and filling process of the wall material into the groove are performed simultaneously, the process of constructing the wall body is one. It becomes possible to reduce costs and shorten the construction period. Moreover, since the ground body improvement apparatus and the two apparatuses of an excavator are not required like patent document 1, and a wall body can be constructed | assembled with one wall body construction apparatus, it is the work of installation or removal of an apparatus. This saves time and effort, and can further reduce costs and shorten the construction period.

  In addition, by closing the opening with the isolation member, it is possible to prevent the earth and sand excavated by the boring rod and the wall material filled in the drilling hole from leaking into the pipe from the opening, making work safe in the pipe Will be able to do. Further, by turning the boring rod within the pipe, the force required for the turning can be reduced, and a cost reduction can be further promoted by using a small driving device as the turning means. For example, when a member such as the excavation arm of Patent Document 1 is used, the excavation speed is slow, and it is necessary to make a large hole that can project the excavation part of the member in the ground in advance using another device. is there. However, as described above, the so-called boring excavation method in which the boring rod is rotated while being pushed forward in the ground to excavate the ground can increase the excavation speed. You can drill holes in the ground even if you do not have large preliminary drill holes in the ground, and it takes less time and labor to install and remove the drilling process and equipment, reducing costs and Shortening can be further promoted. Also, even if there are hard obstacles such as rocks in the ground, excavation can be continued while crushing the obstacles with a boring rod without using other devices such as a hanger. It takes less time and effort to install and remove the equipment, and it is possible to further reduce the cost and the construction period.

  In addition to the above-described structure, the wall construction apparatus around the tube according to the present invention further includes slide means for moving the boring rod in a direction that is perpendicular to the intrusion direction by the intrusion means and parallel to the circumferential direction of the tube. ing.

  In this way, the drilling step of filling the wall material into the drilling hole while making the drilling hole in the ground with the boring rod is performed by the slide means so that the boring rod is perpendicular to the intrusion direction in the pipe and the circumference of the pipe. After moving several times in a direction parallel to the direction, the boring rod is swung in the pipe in the circumferential direction by the swiveling means, so that adjacent drill holes are steadily continuous over the entire depth direction. Thus, an annular groove can be reliably formed around the tube. And by hardening the wall material in the said groove | channel, it becomes possible to construct | assemble the cyclic | annular wall body with high water-blocking performance without a defect around a pipe | tube. Further, by moving the boring rod within the pipe, the force required for the movement can be reduced, and a cost reduction can be further promoted by using a small driving device as the sliding means.

  Moreover, in the wall body construction apparatus around the pipe according to the present invention, the apparatus includes a holding member that is attached to the pipe so as to straddle the separating member and holds the boring rod, and the holding member includes the boring rod and the separating member. The earth and sand receiving part which receives the earth and sand which penetrates in a pipe | tube through this clearance gap, and the earth discharging pipe which discharges | emits the earth and sand received by the said earth and sand receiving part, applying a fixed back pressure are provided.

  In this way, the soil in the ground excavated by the boring rod can be discharged from the borehole to the outside while applying a certain back pressure through the gap between the boring rod and the separating member, the earth receiving part, and the earth discharging pipe. As a result, the work can be safely performed in the pipe. In addition, since the pressure of the wall material and earth and sand in the drilling hole is maintained at a constant back pressure, the wall material and the like in the drilling hole formed above the pipe are difficult to flow downward, and the upper It is possible to prevent a void from being generated in the drilling hole. Furthermore, since the wall material or the like constantly presses the hole wall with a constant pressure, it becomes possible to stably and reliably prevent the collapse of the ground and the infiltration of groundwater.

  Moreover, in the wall construction apparatus around the pipe according to the present invention, the holding member is provided with a work hole for loosening the ground in the vicinity of the isolation member.

  By doing so, before projecting the boring rod from the pipe into the ground, it is possible to loosen the ground in the vicinity of the separating member by passing the rod-like member through the working hole, so that the boring rod does not rotate. It becomes possible to easily project the tip of the boring rod at the loosened portion. Further, it is possible to prevent the isolation member from being damaged by the blade of the boring rod, and it is possible to maintain the isolation performance between the ground of the isolation member and the inside of the pipe.

  Moreover, in the wall body construction apparatus around the pipe according to the present invention, an openable / closable shutter is provided between the separating member and the holding member.

  In this way, by opening the shutter, the boring rod can be pushed out from the inside of the pipe into the ground, and the drilling process can be performed. By closing the shutter, the ground and the inside of the pipe are surely closed, It becomes possible to safely remove earth and sand clogged in the receiving part.

The wall construction method around the pipe according to the present invention is a pipe that constructs a wall around the pipe from the inside of the pipe through an annular opening formed in the pipe laid in the ground without going through the ground improvement process. A surrounding wall body construction method, in which an opening is provided with an isolation member that separates the ground from the inside of the pipe, and a blade for excavating the ground at the tip and a discharge port for discharging a hard wall construction material Extruding the boring rod provided with and through the separating member and the opening from the pipe into the ground, and rotating the boring rod around the axis of the boring rod to form a hole in the ground with a blade, filling the構壁material構壁material by Rikezu hole to be discharged from the discharge port, and by repeating by pivoting the boring rod the drilling process in the tube in the circumferential direction of the tube, the tube around From multiple drilling holes in a continuous state Forming a annular groove, builds an annular wall around the pipe by curing the 構壁 material of the groove.

  In this way, an annular groove in a closed space is formed around the pipe, and the wall material uniformly mixed with the earth and sand in the groove is hardened without diffusing into the ground, and around the pipe. It becomes possible to construct a ring-shaped wall body with high uniform water shielding performance. As a result, it is not necessary to perform the ground improvement process as in Patent Document 1, and since the groove excavation forming process and the filling and filling process of the wall material into the groove are performed simultaneously, the process of constructing the wall body is one. It becomes possible to reduce costs and shorten the construction period.

  Further, in the wall construction method around the pipe according to the present invention, the drilling step is performed by moving the boring rod in the pipe in a direction perpendicular to the boring rod's protruding and retracting direction and parallel to the circumferential direction of the pipe. After a plurality of times, the boring rod is swung in the circumferential direction of the tube within the tube.

  In this way, the adjacent holes in the ground can be steadily continued over the entire depth direction, and an annular groove can be reliably formed around the pipe. By curing, it is possible to construct an annular wall body having high water shielding performance without defects around the pipe.

  Moreover, in the wall body construction method around the pipe according to the present invention, the drilling step is performed after loosening the ground near the isolation member so that the tip of the boring rod can protrude.

  If it does in this way, the tip part of a boring rod can be made to project in the loosened part, without rotating a boring rod, and it becomes possible to prevent damage to an isolation member by the blade of a boring rod.

  Furthermore, in the wall body construction method around the pipe according to the present invention, the water stop plate is opened with the isolation member between the formation of the annular groove around the pipe and the hardening of the construction wall material in the groove. It is inserted into the groove through the part and installed in a ring around the tube.

  In this way, the water stop plate can be easily inserted into the groove with a small insertion force. In addition, when the structural wall material in the groove is hardened, an annular wall body in which a water stop plate is embedded is formed around the pipe, so that the water shielding performance of the wall body can be maintained for a long time. Become.

  According to the present invention, the opening of the pipe is closed by the separating member, and the ground wall material is filled in the drilling hole while the drilling hole is filled in the ground by the boring rod, so that the ground collapses or the groundwater penetrates. An annular groove consisting of a plurality of drilling holes in a continuous state perpendicular to the pipe is formed, and the wall material in the groove is cured without diffusing into the ground, so that a uniform water shielding around the pipe It becomes possible to construct an annular wall body with high performance. As a result, the process of constructing the wall body becomes one stage, and the wall body can be constructed by one wall body construction apparatus, so that the cost can be reduced and the construction period can be shortened.

  1-4 is a figure which shows the wall body construction | assembly apparatus around the pipe | tube which concerns on embodiment of this invention. Each figure has shown the state in which the same wall construction apparatus was installed in the culvert pipe penetrated and laid inside the embankment. 1 is a plan view of the wall construction apparatus, FIG. 2 is a side view of the wall construction apparatus viewed from the direction A in FIG. 1B, and FIG. 3 is a BB view of FIG. 1B of the wall construction apparatus. Sectional drawing and FIG. 4 are CC sectional drawings in FIG.1 (b) of a wall body construction | assembly apparatus.

  In FIG. 1 (a), G is the ground of the dike, Z is a vertical pipe penetrating through the dike by the propulsion method, and U is a backfill material that is injected into the gap between the horizontal pipe Z and the ground G and hardened. . Rg is a split-type split connection ring interposed at the connecting portion between the rod tubes Z. The split connection ring Rg is attached to the soot tube Z with a bolt in FIG. 1 (a), but when the bolt is removed, it can be disassembled and removed from the soot tube Z as shown in FIG. 1 (b). . When the split connection ring Rg is removed, an annular opening X serving as a work port for constructing the wall body from the inside of the tub tube Z is formed. Reference numeral 100 denotes a wall construction apparatus installed in the tub tube Z. As shown in FIGS. 2 and 3, the wall construction apparatus 100 has a substantially bow and arrow shape. Reference numeral 1 denotes an annular all-around seal packing (hereinafter referred to as an all-around seal) which is one of the components of the wall construction apparatus 100. As shown in FIG. 1, the all-around seal 1 closes the opening X to isolate the ground G and the inside of the tub tube Z from each other. Further, the all-around seal 1 is made of rubber, and its end is fixed to the soot tube Z and is divided by a central cut 1a. The all-around seal 1 constitutes an embodiment of a separating member in the present invention.

  Reference numeral 2 denotes an arcuate box installed in the soot tube Z so as to straddle the entire circumference seal 1. Specifically, the arcuate box 2 is held in contact with the inner peripheral surface Za of the soot tube Z by a presser plate 3 fixed to the soot tube Z with bolts as shown in FIGS. 2 and 4. As shown in FIGS. 3 and 4, the arcuate box 2 is provided with an earth and sand receiving portion 2 a formed of a hollow portion. Long holes 2b and 2c are respectively provided above (D direction side) and below (F direction side) the earth and sand receiving portion 2a. Reference numeral 4 denotes a slide plate attached to the arcuate box 2 so as to be movable in the L and R directions (FIG. 3). The slide plate 4 has a size capable of closing the long hole 2 c of the arcuate box 2. Reference numeral 5 denotes a shutter inserted in the arcuate box 2. The shutter 5 is formed in an arch shape with a flexible material such as a thin metal plate or synthetic resin, and a long hole 5a is provided at a position deviated from the center as shown in FIG. The long hole 2b of the arcuate box 2 is opened (the communication between the long hole 2b and the long hole 5a) by manually shifting the shutter 5 in the circumferential direction of the soot tube Z (Q direction or anti-Q direction in FIG. 3). State) or a closed state (non-communication state of the long hole 2b and the long hole 5a). In FIG. 3, the long hole 2 b of the arcuate box 2 is opened by the shutter 5. The arcuate box 2 and the slide plate 4 constitute one embodiment of the holding member in the present invention.

  A boring rod 6 is held by the slide plate 4 via a flange 7 so as to penetrate the arcuate box 2. A gap between the boring rod 6 and the flange 7 is sealed by an O-ring or the like. The tip of the boring rod 6 is provided with a blade 6a for excavating the ground and a discharge port 6b (FIG. 6) for discharging a hard wall construction material. Reference numeral 8 in FIG. 3 denotes a rotational drive unit in which the rear end of the boring rod 6 is connected. The rotation drive unit 8 is composed of a motor, a gear, and the like, and rotates the boring rod 6 around the axis J of the rod 6 at a high speed. The rotation drive unit 8 constitutes an embodiment of the rotation means in the present invention.

  Reference numeral 9 denotes a swivel attached to the rotary drive unit 8 in a penetrating manner so as to communicate with a hollow portion (not shown) of the boring rod 6. By connecting the supply hose of the wall material supply device (not shown) installed outside the tub tube Z to the connection port 9a of the swivel 9, the wall material is fed into the hollow portion of the boring rod 6 with a predetermined pressure. Thus, it is possible to discharge from the discharge port 6b of the boring rod 6. The discharge amount and discharge pressure of the wall material are adjusted by an adjustment valve (not shown). In addition, a cement-based curing agent having curability is used for the wall material, but it is preferably highly viscous and has a slow development of strength that can be pushed and deformed with a finger even after 24 hours have passed since injection. A material blended with bendite or the like is used.

  A mast 10 is erected on the slide plate 4. The mast 10 is provided with an in / out drive unit 11 composed of a motor, a gear, a sprocket, a chain, and the like. A rotation drive unit 8 is connected to the chain of the in / out drive unit 11 via a connection plate 12 shown in FIG. The appearance drive unit 11 moves the rotary drive unit 8 in the D and F directions along the mast 10 to move the boring rod 6 into the long hole 5a of the shutter 5, the long hole 2b of the arcuate box 2, the all-around seal 1, And it pushes out into the ground G through the opening X or retracts into the tub tube Z. In FIG. 3, a state in which the boring rod 6 is retracted to the maximum extent in the vertical pipe Z and is immersed is shown by a solid line, and a state in which the boring rod 6 is pushed out into the ground G is shown by a two-dot chain line. 4 and 6 show a state in which the boring rod 6 pushes open the entire circumference seal 1 and protrudes into the ground G by approximately half a stroke. The in / out drive unit 11 constitutes an embodiment of in / out means in the present invention.

  Reference numeral 13 shown in FIGS. 1 and 2 denotes a slide cylinder. The rear end of the main body 13 a of the slide cylinder 13 is connected to the arcuate box 2. The tip of the rod 13 b of the slide cylinder 13 is connected to the slide plate 4. The slide cylinder 13 expands and contracts the rod 13b to move the boring rod 6 through the slide plate 4 in the L and R directions perpendicular to the projecting directions F and D and parallel to the circumferential direction Q of the vertical tube Z. 2 is moved within the range of the size of the long hole 2c. In FIG. 3, the state in which the boring rod 6 has moved in the L direction at maximum is indicated by a solid line, and the state in which the boring rod 6 has moved in the R direction at maximum is indicated by a one-dot chain line. 1 and 2 show a state in which the boring rod 6 has moved in the L direction as much as possible. The slide cylinder 13 constitutes an embodiment of the slide means in the present invention.

  Reference numeral 14 shown in FIGS. 1 and 2 denotes a turning cylinder. The rear end of the main body 14a of the turning cylinder 14 is rotatably connected to a reaction force plate 15 fixed to the tub tube Z with a bolt via a pin. The tip of the rod 14b of the turning cylinder 14 is rotatably connected to the arcuate box 2 via a pin. As shown in FIG. 2, a guide roller 16 is attached to the bottom of the arcuate box 2 so that the inner peripheral surface Za of the soot tube Z can roll. With the rod 14b of the turning cylinder 14 contracted as shown in FIGS. 1 and 2 (a), the holding plate 3 is shifted by a predetermined angle in the circumferential direction Q along the inner peripheral surface Za of the soot tube Z. It fixes to the soot pipe Z with a volt | bolt. When the presser plate 3 is moved, the arcuate box 2 is held by the presser plate 3 and the turning cylinder 14, so that the radial direction (D direction) and the circumferential direction (Q direction and anti-Q direction) It doesn't move. When the rod 14b of the swing cylinder 14 is extended from this state as shown in FIG. 2B, the guide roller 16 rolls along the inner peripheral surface Za, and the arcuate box 2 and the boring rod 6 are Turn a predetermined angle in the direction. The turning angle is determined by connecting the main body 14a of the turning cylinder 14 and the reaction force plate 15 (a plurality of pin holes 15g provided in the reaction force plate 15), and the connection position of the rod 14b and the arcuate box 2 (bow shape). It can be adjusted by changing each of the plurality of pin holes 2g provided in the box 2). After turning, bolts (not shown) are provided in a plurality of fixing holes 3h provided in the holding plate 3 and a plurality of pin holes 2g or fixing holes 2h provided in the arcuate box 2 concentric with the fixing holes 3h. And the arcuate box 2 is temporarily fixed to the holding plate 3. In this temporarily fixed state, the connection between the turning cylinder 14 and the reaction force plate 15 or the arcuate box 2 is disconnected, the rod 14b is contracted, and the connection position between the turning cylinder 14 and the reaction force plate 15 or the arcuate box 2 is changed. . Alternatively, the revolving cylinder 14 is removed from the reaction force plate 15, the reaction force plate 15 is removed from the vertical tube Z and fixed at a position shifted by a predetermined angle in the Q direction, the rod 14b is contracted, and the revolving cylinder 14 is retreated. 15 is connected. If the revolving cylinder 14 is contracted and the connection position is changed as described above, the bolt is removed from the fixing hole 3h and the pin hole 2g or the fixing hole 2h, and the temporary fixing of the arcuate box 2 to the holding plate 3 is released. To do. Thereafter, as described above, after the holding plate 3 is further shifted and fixed in the Q direction by a predetermined angle and then the rod 14b is extended, the arcuate box 2 and the boring rod 6 and the like further rotate in the Q direction by a predetermined angle. That is, by repeating the above-described series of procedures, the boring rod 6 can turn 360 ° in the circumferential direction Q of the soot tube Z. The turning cylinder 14 constitutes an embodiment of turning means in the present invention.

Reference numeral 17 shown in FIG. 4 denotes a soil discharge pipe connected to the discharge part 2 d of the arcuate box 2. A back pressure valve 18 made of a rubber tube that expands and contracts with air is provided inside the soil discharge pipe 17. As described above, the boring rod 6 is pushed out into the ground G by the appearance driving unit 11, the boring rod 6 is rotated by the rotation driving unit 8, and the wall material is discharged from the discharge port 6 b of the boring rod 6. If this is performed at the same time, the ground G is excavated to form a hole, and the wall material is filled into the hole. At this time, the excavated earth and sand enter the earth and sand receiving part 2a of the arcuate box 2 through the gap S (shown in FIG. 6) between the boring rod 6 and the all-around seal 1 while being mixed with the wall material. And the earth and sand etc. which entered the earth and sand receiving part 2a are discharged | emitted outside through the discharge part 2d and the earth discharge pipe | tube 17, applying a fixed back pressure by the back pressure valve 18. FIG. As a result, the pressure of the wall material or the like in the drilling hole formed in the earth and sand receiving part 2a and in the ground G communicating with the earth and sand receiving part 2a via the gap S is maintained at the constant back pressure. The The constant back pressure is set to be equal to or higher than the water head pressure of the groundwater contained in the ground G or higher than the water head pressure of the wall material filled in the drilling hole. Specifically, it is set to about 0.2 to 0.3 kg / cm ² .

  Reference numeral 19 shown in FIGS. 2 and 3 denotes a maintenance bracket attached to the slide plate 4. The maintenance bracket 19 is provided with a service hole 19a communicating with the hole 4a of the slide plate 4 and the long hole 2c of the arcuate box 2 and a shutter 20 that can be opened and closed in a direction perpendicular to the paper surface. When the shutter 20 is closed, the service hole 19a is closed, so that the sand or the like that has entered the earth and sand receiving portion 2a does not leak into the vertical pipe Z through the service hole 19a. Further, when the shutter 20 is opened, the service hole 19a is opened, and the rod-like member 21 is inserted from the service hole 19a as shown in FIG. 7, and the ground is passed through the earth and sand receiving portion 2a, the entire circumference seal 1, and the opening X. Can project into G. A connecting portion 21a for connecting a hose 23 for supplying water from the outside is provided at the rear end portion of the rod-shaped member 21, and a discharge port 21b for discharging water and the ground G are shaved at the front end portion. For this purpose, a claw 21c is provided. A rubber 22 seals the service hole 19a with the rod-shaped member 21 inserted. As shown in FIG. 7, with the rod-shaped member 21 protruding into the ground G, the back-filling material in the vicinity of the all-around seal 1 is moved by moving the rod-shaped member 21 up and down and left and right while discharging water from the discharge port 21b. It is possible to loosen (soften) U and ground G (portions enclosed by broken lines) by breaking them or scraping them into the earth and sand receiving part 2a. The service hole 19a constitutes an embodiment of the work hole in the present invention.

  8A to 12 are views for explaining a wall body construction method around a pipe according to the embodiment of the present invention. This construction method is carried out using the wall construction apparatus 100 described above. As described above, the split connection ring Rg (shown in FIG. 1A) interposed in the connecting portion between the soot tubes Z is disassembled and removed, and the annular opening X (for example, FIG. After forming (shown in (b)), the wall construction apparatus 100 is installed in the tub tube Z. At this time, the presser plate 3 is permanently fixed to the soot tube Z so that the arcuate box 2 does not move. First, the shutter 5 and the shutter 20 (FIG. 7) of the maintenance bracket 19 are opened, and the rod-shaped member 21 is moved from the service hole 19a to the all-round seal 1 and the opening X as shown in FIG. 8A (a). And protrudes into the ground G through the rod-shaped member 21 as described above, loosening the ground G in the vicinity of the all-around seal 1. When the loosening is finished, the rod-shaped member 21 is removed from the service hole 19a, and the shutter 20 is closed. Next, the boring rod 6 is pushed in the F direction by the projecting drive unit 11, and the blade 6a of the boring rod 6 is protruded into the ground G as shown in FIG. 8A (b) through the entire circumference seal 1 and the opening X. . At this time, since the ground G in the vicinity of the all-around seal 1 is loosened, the blade 6a of the boring rod 6 can be easily protruded into the ground G.

  When the blade 6a of the boring rod 6 is protruded, the boring rod 6 is pushed out in the F direction by the protrusion driving unit 11, the boring rod 6 is rotated by the rotation driving unit 8, and the discharge port 6b of the boring rod 6 The wall material is discharged simultaneously from (FIG. 6). As a result, the ground G is excavated by the boring rod 6 and a hole V having a diameter slightly larger than the diameter of the boring rod 6 is formed, and the wall material (indicated by symbol Y in the drawing) is formed in the hole V. Goes filled. At this time, the excavated earth and sand are mixed with the construction wall material Y, enter the earth and sand receiving part 2a through the gap S (FIG. 6) between the boring rod 6 and the entire circumference seal 1, and further, the earth discharging pipe 17 (FIG. 4). ) And is discharged out of the tub tube Z while applying a certain back pressure. Thereby, the pressure of the wall material Y filled in the hole V is maintained at the constant back pressure. Note that the wall material Y presses the wall of the drilling hole V almost without penetrating into the ground G because particles such as cement are large and clog the wall of the drilling hole V. Further, since the wall construction material Y has high viscosity, it is difficult to leak from the bore hole V through the cut 1a (FIG. 1) of the all-around seal 1 into the soot pipe Z. Then, as shown in FIG. 8A (c), when the boring rod 6 is pushed out in the F direction as much as possible, the boring rod 6 is retracted in the D direction by the projecting drive unit 11, and is inserted into the soot tube Z. At this time, if the rotation of the boring rod 6 and the discharge of the wall material Y are continuously performed, the earth and sand and the wall material Y are mixed in the hole V in a uniform state, and the pressure in the hole V is reduced. The state in which the constant back pressure is maintained is maintained.

  When the boring rod 6 is inserted into the vertical tube Z, the slide cylinder 13 (FIG. 2) moves the boring rod 6 together with the slide plate 4 and the like to a predetermined diameter smaller than the diameter of the boring rod 6 as shown in FIG. 8A (d). Move in the R direction at a pitch. After the movement, the blade 6a of the boring rod 6 is caused to protrude into the ground G by the protrusion driving unit 11 as described above. At this time, since the hole V has already been made in the vicinity of the ground G to be projected, the ground G is soft, and the blade 6a of the boring rod 6 can be easily projected. Subsequently, as described above, the boring rod 6 is pushed in the F direction, the boring rod 6 is rotated, and the wall material Y is discharged from the discharge port 6b. The wall material Y is filled into the hole V while forming the hole V therein. At this time, a part of the boring rod 6 advances in the first drilling hole V, and the first drilling hole V and the second drilling hole V overlap. Then, as shown in FIG. 8B (e), when the boring rod 6 is pushed out in the F direction as much as possible, the boring rod 6 is immersed into the vertical tube Z as described above, and is further moved in the R direction at a predetermined pitch. After the movement, a drilling step of filling the wall material Y into the drilling hole V while performing drilling V in the ground G again by the boring rod 6 is performed.

  Then, the above drilling step is performed four times while the boring rod 8 is moved in the R direction by the slide cylinder 13, and when four holes V are formed in the ground G as shown in FIG. The rod 6 is immersed in the soot tube Z, and the boring rod 6 is moved in the L direction to the maximum along with the slide plate 4 and the like as shown in FIG. 8B (g). After the movement, the boring rod 6 together with the arcuate box 2 and the like is swung by a predetermined angle in the Q direction as shown in FIG. 8B (h) by the swivel cylinder 14 (FIG. 2) as described above. The turning angle at this time is small so that the next time the boring rod 6 is pushed into the ground G to the maximum extent by the projecting / retracting drive unit 11, the blade 6a of the boring rod 6 surely enters the hole V already made. Set the angle. When the boring rod 6 is turned by a predetermined angle in the Q direction, the above drilling step is performed four times while moving the boring rod 8 in the R direction, and four more in the ground G as shown in FIG. 8C (i). Drill holes V. The state of the tip side (F direction side) of the eight holes V made in the ground G at this time is shown in FIG. In FIG. 9, the four drilling holes V made before turning by the turning cylinder 14 are indicated by a two-dot chain line, and the four drilling holes V made after turning are indicated by a solid line. All the eight drilling holes V overlap with each other and are in a continuous state in the entire depth direction.

  Thereafter, as described above, the boring rod 6 is immersed in the vertical tube Z, the maximum movement of the boring rod 6 in the L direction, the turning of the boring rod 6 by a predetermined angle in the Q direction, and the boring. When the series of operations of the above four drilling steps while moving the rod 8 in the R direction is repeated, a continuous state in which the wall material Y is filled around the vertical tube Z as shown in FIG. 8C (j). A groove M composed of a plurality of holes V is formed and gradually expanded in the Q direction. At that time, even if there is a hard obstacle E such as a rock in the ground G, the ground G is excavated by rotating the boring rod 6 by the rotary drive unit 8 while pushing the boring rod 6 in the F direction by the intrusion drive unit 11. 8C (k), the obstacle E can be crushed with the blade 6a of the boring rod 6, and the formation of the hole V can be continued. Moreover, by replacing the blade 6a of the boring rod 6 with a type corresponding to the type (quality, size, strength, etc.) of the obstacle E, the obstacle E can be crushed more reliably.

  Then, when the boring rod 6 is turned 360 ° in the circumferential direction Q by repeating the above-described series of operations, the annular wall Z is filled with the wall material Y around the vertical tube Z as shown in FIG. The groove M is formed. Thereafter, the wall construction apparatus 100 is disassembled and removed, and the split connection ring Rg is assembled to the connecting portion between the tubules Z as shown in FIG. Then, after a while, when the structural wall material Y in the groove M is cured, an annular wall W is constructed perpendicularly to the soot tube Z around the soot tube Z and becomes a water shielding wall.

  In addition, after disassembling and removing the wall construction apparatus 100, the steel material as shown in FIG. 11 (n) until the construction wall material Y in the groove M is cured without assembling the split connection ring Rg. The water stop plate 25 made of may be inserted into the groove M by pushing the entire circumference seal 1 and the bottom portion 25a of the water stop plate 25 may be fixed to the connecting portion between the vertical pipes Z with bolts. The water stop plate 25 is inserted using a jack, a cylinder, or the like. When one water stop plate 25 is fixed, the entire seal 1 is pushed out and inserted into the groove M while another water stop plate 25 is placed along the fixed water stop plate 25, and the bottom portion 25a is fixed to the pipe Z. To do. Then, when the water stop plates 25 are successively inserted into the grooves M and fixed to the soot tube Z, the water stop plate 25 finally loops around the soot tube Z as shown in FIG. It becomes the state installed in. If it will be in such a state, since the opening part X of the soot pipe Z will be closed by the bottom part 25a of the water stop board 25 as shown in FIG. 12, the construction wall material Y in the groove | channel M will be hardened as it is. At this time, the split connection ring Rg may be assembled on the bottom 25a and returned to its original state. Thereafter, when the structural wall material Y is cured, the annular wall body Wa in which the water blocking plate 25 is embedded around the dredger tube Z is constructed perpendicularly to the dredger tube Z to become a water shielding wall.

  As described above, the entire circumference seal 1 is provided in the opening X, and the drilling tube Z is filled with the wall material Y in the drilling hole V while the drilling hole V is formed in the ground G by the boring rod 6. A hole V in a closed space is formed around the wall, and the wall material Y filled in the hole V presses the wall of the hole V, causing the ground G to collapse and groundwater infiltration. The annular groove M can be formed perpendicularly to the soot tube Z. Further, by rotating the boring rod 6 by the rotation driving unit 8, the earth and sand of the excavated ground G and the wall material Y discharged from the discharge port 6b can be stirred in the drilling hole V and mixed uniformly. it can. Therefore, the wall material Y is hardened in the formed groove M without diffusing into the ground G, and it is possible to construct an annular wall body W with high water-blocking performance that is homogeneous around the vertical pipe Z. Become. As a result, it is not necessary to perform the ground improvement process as in Patent Document 1, and the excavation formation process of the groove M and the filling and filling process of the wall material Y into the groove M are performed simultaneously. The construction process becomes one step, and it is possible to reduce costs and shorten the construction period. Moreover, since the wall body W can be constructed | assembled with the one wall body construction apparatus 100, without requiring two apparatuses of a ground improvement apparatus and an excavator like patent document 1, installation and removal of an apparatus are possible. The work does not take time and effort, and it is possible to further reduce costs and shorten the construction period. In addition, the wall construction apparatus 100 is smaller than the ground improvement apparatus and excavator of Patent Document 1, and has a small occupation space in the vertical pipe Z. Therefore, the wall construction apparatus 100 is easy to work in the vertical pipe Z, and is installed and removed. Therefore, it is possible to further reduce the cost and the construction period without taking time and effort.

  For example, when a member such as the excavating arm of Patent Document 1 is used, the excavation speed is slow, and it is necessary to make a large hole in the ground G that can project the excavating part of the member in advance using another device. There is. However, as described above, by adopting a so-called boring excavation method in which the boring rod 6 is rotated while being pushed forward in the ground G to excavate the ground G, the excavation speed can be increased, and other devices can be used. Even if a large preliminary drilling hole is not made in the ground G, it is possible to make a drilling hole V in the ground G, and it does not take time and labor for the excavation process and the installation and removal work of the device, Cost reduction and shortening of construction period can be further promoted. Further, even if there is a hard obstacle E such as a rock in the ground G, the excavation is continued while the obstacle E is crushed by the boring rod 6 without using another device such as a suspension machine. Therefore, it takes less time and labor to install and remove the device, and it is possible to further promote cost reduction and shortening the construction period.

  In addition, a drilling process in which the drilling hole V is filled in the ground G by the boring rod 6 and the wall material Y is filled in the drilling hole V, and the boring rod 6 is perpendicular to the projecting directions F and D by the slide cylinder 13. In addition, after moving a plurality of times by moving in the R direction parallel to the circumferential direction Q of the tub tube Z, the boring rod 6 is swung in the Q direction by the swiveling cylinder 14 so that the adjacent drill holes V are moved in the depth direction. The annular groove M can be surely formed around the soot tube Z by steadily continuing over the whole. Then, by hardening the structural wall material Y in the groove M, it is possible to construct an annular wall body W having a high water shielding performance without defects around the vertical pipe Z.

  Further, by closing the opening X with the entire circumference seal 1, it is possible to prevent the earth and sand excavated by the boring rod 6 and the wall material Y filled in the drilling hole V from leaking from the opening X into the duct Z. Thus, the work can be safely performed in the tub tube Z. Further, since the boring rod 6 is swung in the vertical direction Z in the vertical pipe Z and moved in the L and R directions, the force required for the swiveling and movement is small, and the small swiveling cylinder 14 as the swiveling means and the sliding means are sufficient. Each of the small slide cylinders 13 can be used, and cost reduction can be further promoted.

  Further, the earth and sand excavated by the boring rod 6 and the construction wall material Y mixed with the earth and sand are removed from the drilling hole V between the gap S between the boring rod 6 and the entire circumference seal 1, the earth and sand receiving portion 2a of the arcuate box 2, and the drainage. Since it can be discharged to the outside through each of the clay pipes 17 while applying a certain back pressure, the work can be safely performed in the vertical pipe Z. In addition, since the pressure of the wall material Y and the like in the hole V is maintained at a constant back pressure, the wall material Y and the like in the hole V formed above the soot tube Z hardly flows downward. Thus, it is possible to prevent a void from being generated in the upper drilling hole V. Further, since the wall material Y or the like always presses the wall of the drilling hole V with a constant pressure, it is possible to stably and reliably prevent the ground G from collapsing and the penetration of groundwater.

  In addition, before the boring rod 6 is first projected from the inside of the dredging pipe Z into the ground G, the rod-like member 21 is inserted from the service hole 19a, and the earth and sand receiving portion 2a, the entire circumference seal 1 and the opening X are respectively connected. Since the ground G in the vicinity of the all-around seal 1 can be loosened through the ground G, the tip of the boring rod 6 is easily projected to the loosened portion without rotating the boring rod 6. It becomes possible. In addition, it is possible to prevent the all-around seal 1 from being damaged by the blade 6a of the boring rod 6, and it is possible to maintain the isolation performance between the ground G of the all-around seal 1 and the inside of the pipe Z. Moreover, when the earth and sand receiving part 2a etc. are clogged with earth and sand, the earth and sand etc. can be removed from the service hole 19a. At that time, by closing the shutter 5 provided between the all-round seal 1 and the arcuate box 2, the ground G and the inside of the tub tube Z are surely closed, and earth and sand from the cut 1 a of the all-around seal 1 Leakage of the wall material can be surely prevented, and the earth and sand clogged in the earth and sand receiving part 2a and the like can be safely removed from the service hole 19a.

  Furthermore, after forming the annular groove M around the soot tube Z, the water stop plate 25 is inserted into the groove M through the entire circumference seal 1 and the opening X, and installed around the soot tube Z in an annular shape. When the wall material Y in the groove M is hardened, an annular wall body Wa in which the water blocking plate 25 is embedded is formed around the vertical pipe Z, and the water shielding performance of the wall body Wa is maintained for a long time. It becomes possible. Further, by inserting the water stop plate 25 into the groove M until the structural wall material Y in the groove M is hardened, the inside of the groove M can be obtained with a small insertion force using a small equipment such as a jack or a cylinder. It is possible to easily insert the water stop plate 25. In addition, after the wall material Y in the groove M is cured to a semi-cured state that loses fluidity, when the water stop plate 25 is inserted into the groove M, all of the water stop plate 25 and the water stop plate 25 are inserted when the water stop plate 25 is inserted. It is possible to prevent the wall material Y from leaking into the soot tube Z from the gap with the circumferential seal 1.

  In the embodiment described above, an example in which the annular all-around seal 1 as a separating member is provided in the opening X before the split connection ring Rg is disassembled and removed is described, but the present invention is limited to this. Instead, the separating member may be provided in the opening X after dismantling and removing the split connection ring Rg.

  Moreover, in the above embodiment, in order to loosen the ground G in the vicinity of the all-around seal 1, the example using the rod-like member 21 having a slightly bent tip is given, but the present invention is not limited to this. Alternatively, a straight member such as a bar or a bowl-shaped member may be used. That is, any member may be used as long as it can loosen the ground G in the vicinity of the all-around seal 1 by poking or scraping it. Further, a member for loosening the ground G in the vicinity of the all-around seal 1 and a member for discharging water to the ground G may be provided separately.

  Moreover, in the above embodiment, although the assembly | attachment operation | work of the division | segmentation connection ring Rg and the insertion installation operation | work of the water stop board 25 are performed after removing the wall body construction | assembly apparatus 100, these work | work is performed by a wall body construction | assembly apparatus. 100 may be performed with the tube 100 installed in the tub tube Z. Moreover, you may make it carry out at any time while the groove | channel M is expanded.

  Further, in the above embodiment, an example is given in which the operations such as the formation of the hole V and the insertion and installation of the water stop plate 25 in the groove M are started from the lower side of the tub tube Z, but the present invention is only this. However, these operations can be started from any direction of the soot tube Z because the entire circumference seal 1 is provided over the entire annular opening X.

It is a top view of the wall body construction device around the pipe concerning the embodiment of the present invention. It is the side view which looked at the same wall building apparatus from the A direction of FIG. It is BB sectional drawing in FIG.1 (b) of the same wall construction apparatus. It is CC sectional drawing in FIG.1 (b) of the same wall construction apparatus. It is a figure which shows the shutter of the wall construction apparatus. It is a figure which shows the ground protrusion state of the boring rod of the wall construction apparatus. It is a figure which shows the rod-shaped member inserted in the wall construction apparatus. It is a figure explaining the wall body construction construction method of the circumference of a pipe concerning the embodiment of the present invention. It is a figure explaining the wall body construction construction method of the circumference of a pipe concerning the embodiment of the present invention. It is a figure explaining the wall body construction construction method of the circumference of a pipe concerning the embodiment of the present invention. It is a figure explaining the wall body construction construction method of the circumference of a pipe concerning the embodiment of the present invention. It is a figure explaining the wall body construction construction method of the circumference of a pipe concerning the embodiment of the present invention. It is a figure explaining the wall body construction construction method of the circumference of a pipe concerning the embodiment of the present invention. It is a figure explaining the wall body construction construction method of the circumference of a pipe concerning the embodiment of the present invention. It is a figure explaining the wall body construction situation of the conventional pipe circumference.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 All-around seal packing 2 Arcuate box 2a Sediment receiving part 4 Slide plate 5 Shutter 6 Boring rod 6a Blade 6b Discharge port 8 Rotation drive part 11 Intrusion drive part 13 Slide cylinder 14 Turning cylinder 17 Exhaust pipe 19a Service hole 25 Water stop plate 100 Wall body construction equipment around the pipe D Dipping direction of the boring rod E Obstacle F Projecting direction of the boring rod G Ground J Shaft of the boring rod M Groove Q Circumferential direction of the pipe, turning direction of the boring rod R Moving direction of the boring rod L Moving direction of boring rod S Clearance between boring rod and all-around seal packing W Wall body Wa Wall body X Opening Y Frame member Z Steel pipe

Claims (9)

Through the annular opening formed in the pipe laid in the ground, without passing through the ground improvement process, it is a wall body construction device around the pipe to build a wall body around the pipe from the inside,
An isolation member that closes the opening and isolates the ground and the pipe;
A boring rod provided with a blade for excavating the ground at the tip and a discharge port for discharging a hard wall construction material,
Intrusion means for causing the boring rod to invade into the ground through the isolation member and the opening,
Rotating means for rotating the boring rod about the axis of the boring rod;
Turning means for turning the boring rod in a circumferential direction of the pipe ,
The retracting means pushes the boring rod into the ground, the rotating means rotates the boring rod, and the boring rod forms a hole in the ground with the blade, and the wall forms the wall from the discharge port. An apparatus for constructing a wall body around a pipe, wherein a wall material is discharged into the hole and discharged . In the apparatus for constructing a wall around a pipe according to claim 1,
An apparatus for constructing a wall around a pipe, comprising: slide means for moving the boring rod in a direction perpendicular to the direction of appearance of the intrusion means and parallel to the circumferential direction of the pipe. In the apparatus for constructing a wall around a pipe according to claim 1 or 2,
A holding member attached to the pipe so as to straddle the isolation member and holding the boring rod;
To the holding member, the earth and sand receiving portion for receiving the earth and sand entering the pipe through the gap between the boring rod and the isolation member, and the earth and sand received by the earth and sand receiving portion are discharged while applying a certain back pressure. An apparatus for constructing a wall body around a pipe, characterized in that a soil discharge pipe is provided. In the wall body construction device around a pipe according to claim 3,
An apparatus for constructing a wall around a pipe, wherein the holding member is provided with a work hole for loosening the ground in the vicinity of the isolation member. In the apparatus for constructing a wall around a pipe according to claim 3 or 4,
An apparatus for constructing a wall around a pipe, wherein an openable / closable shutter is provided between the isolation member and the holding member. Through the annular opening formed in the pipe laid in the ground, without passing through the ground improvement process, it is a wall body construction method around the pipe to build a wall body around the pipe from the inside of the pipe,
An isolation member for isolating the ground and the inside of the pipe is provided in the opening,
A boring rod provided with a blade for excavating the ground at the tip and a discharge port for discharging a hard wall construction material is pushed out from the pipe into the ground through the isolation member and the opening. and the structure in said boring by ejecting the boring rod while forming a boring in the ground by the blade shaft is rotated around the of the boring rod, the構壁material from said discharge port Filling the wall material,
By repeatedly performing the drilling step in the pipe by turning the boring rod in the circumferential direction of the pipe, an annular groove composed of a plurality of the drilling holes in a continuous state around the pipe is formed,
A wall construction method around a tube, wherein the wall material in the groove is cured to construct an annular wall around the tube. In the wall structure construction method around the pipe according to claim 6,
The drilling step is performed a plurality of times in the pipe by moving the boring rod in a direction perpendicular to the boring rod's protruding and retracting direction and parallel to the circumferential direction of the pipe, and then moving the boring rod in the pipe. A method for constructing a wall around a pipe, characterized by swirling in the circumferential direction of the pipe. In the wall structure construction method around a pipe according to claim 6 or claim 7,
A wall construction method around a pipe, wherein the drilling step is performed after loosening the ground in the vicinity of the isolation member so that the tip of the boring rod can protrude. In the wall body construction method around the pipe according to any one of claims 6 to 8,
Between the formation of the annular groove around the tube and the hardening of the wall material in the groove, a water stop plate is inserted into the groove through the isolation member and the opening. A wall construction method around a pipe, characterized by being installed in a ring around the pipe.

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