JP4330929B2 - Water stop device and water stop method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water stop device and a water stop construction method for stopping water outflow from a water leakage portion of an object installed in the ground.
[0002]
[Prior art]
As an installation object provided in the ground, there is a retaining wall made of steel sheet pile or soil cement, for example. The retaining wall is installed in the ground so as to surround the construction site before constructing an underground structure or the like, and prevents the ground from collapsing during construction work. FIG. 7 is a diagram showing a state in which the inside of the retaining wall is excavated in order to construct an underground structure after the retaining wall is installed. In FIG. 7 , W is a retaining wall installed in the ground G, H is an excavation shaft for constructing an underground structure formed by excavating the retaining wall W, and K is a bottom in the retaining wall W. The retaining wall W prevents the ground G from collapsing into the excavated shaft H, but the groundwater in the ground G from the gap between sheet piles constituting the retaining wall W or cracks such as soil cement cracks into the excavated shaft H May leak out. In addition, earth and sand may be mixed with groundwater. Z is a water leakage portion of the retaining wall W including the above-described defect portion, and X is a gap generated in the ground G by groundwater and earth and sand flowing out from the water leakage portion Z. In addition, since the space | gap X becomes a flow path of groundwater etc., if the outflow of groundwater etc. continues, it will be expanded from the magnitude | size shown in figure. As described above, if groundwater or the like flows into the open shaft H, the work cannot be performed safely. Therefore, measures to stop the outflow are necessary.
[0003]
Therefore, conventionally, after drilling the ground G from the ground surface Ga to the gap X in the vicinity of the water leakage portion Z with a rod of a boring machine to form a hole as shown by the broken line, the hole X is formed through the hollow portion in the rod. Stopping the outflow of groundwater from the water leakage portion Z into the open shaft H by injecting the hardening material and hardening the injected hardening material has been performed. However, in this method, since the hardened material injected into the gap X flows into the open shaft H from the water leakage part Z together with the groundwater before hardening, the hardened material is hard to be hardened in the gap X and the groundwater flows out. It is very difficult to stop. There is also a problem that the amount of the hardener injected increases and the cost of the hardener increases.
[0004]
On the other hand, in Patent Document 1 below, a bag is housed in a rod of an excavator, a hole is formed deeper than the water leakage portion of the water blocking wall with the rod, and then the rod is pulled out from the hole. Leakage part by leaving the bag body there, watertightly connecting the inlet of the pump for curing material injection to the opening near the ground surface of the bag body, injecting the curing material into the bag body and expanding the bag body It is described that the outflow of groundwater from the water leakage part is stopped by pressure bonding. According to this method, since the water leakage part is sealed from the ground side by the expanded bag body, the outflow of ground water from the water leakage part can be stopped.
[0005]
[Patent Document 1]
JP-A-5-132962 [0006]
[Problems to be solved by the invention]
However, in the method of Patent Document 1, the leaking part from the leaking part to the ground surface is used to connect the inlet of the pump for injecting the hardener to the opening of the bag after leaving the bag in the hole. Therefore, there is a problem in that the cost of the bag increases. Moreover, in order to inflate such a long bag body, a very large amount of the curing material is required, and there is a problem that the cost for the curing material increases.
[0007]
This invention solves the said problem, and the place made into the subject is providing the water stop apparatus and water stop construction method which can stop the outflow of the water from a water leak part at low cost. is there.
[0008]
[Means for Solving the Problems]
The water stop device according to the present invention is a water stop device that stops the outflow of water from the water leakage part of the installed object in the ground, and has a fast hardening property that cures by mixing two materials , a main material and a hardening accelerator. A two-material injection tube that injects two of the cured materials through independent paths, a bag body that expands when two materials are injected therein, and a bag body that is attached to the tip of the two-material injection tube A mounting mechanism that establishes an injection path for injecting the two materials into the bag body from the two-material injection pipe by an independent path . The two-material injection pipe is inserted into a hollow portion in a rod of a boring machine that excavates the ground to form a drilling hole, and the bag body is disposed in the vicinity of the blade portion provided at the tip of the rod. Then, by rotating the rod, the bag material in which the two materials injected therein are cured and inflated is cut by the blade portion and detached from the two-material injection tube.
[0009]
With the above configuration, the two-material injection pipe and the bag body attached to the tip of the two-material injection pipe by the attachment mechanism are inserted into the hollow part of the rod of the boring machine that excavates the ground to form a hole. The bag body can be inflated by injecting the main material and the curing accelerator from the two-material injection tube. Then, the two materials injected into the bag can be mixed and cured to maintain the expanded state of the bag, and the expanded bag is cut with the blade of the rod from the two-material injection tube. It can be detached and left in the vicinity of the leaking part.
[0010]
Further, the water stopping construction method according to the present invention, ground by a water stopping construction method for stopping the flow of water from the water leakage portion of the ground in the installed objects using the above water stopping device, the water from the water leakage portion flows The ground is excavated with a rod until a gap formed therein is formed, a hole is formed, and a bag is inserted into the hollow portion of the rod left in the hole with the injection pipe for two materials , and the bag is In the vicinity of the blade provided at the tip of the rod. Then, by injecting two materials from the two-material injection tube, the bag body is inflated, and by rotating the rod, the two materials injected into the interior are cured and the inflated bag body is removed by the blade portion. It cut | disconnects, it is made to detach | leave from the said injection pipe for 2 materials , and is left to stand in a space | gap.
[0011]
In this case, since the gap is filled with the left inflated bag body and the flow path of the water is blocked, it is possible to block water from flowing through the gap, so that the water from the leakage portion can be blocked . It becomes possible to stop the outflow. Moreover, since it is not necessary to use the long bag body according to the depth of a water leakage part like patent document 1, the cost concerning the hardening material for inflating a bag body and a bag body can be restrained low. Furthermore, by injecting the curing material into the bag, the curing material does not flow out of the water leakage portion, so that the amount of the curing material injected does not increase and the cost for the curing material does not increase as in the past. .
[0012]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 are views showing a water stop device according to the present invention. 1, 104 is a water stop device according to the present invention, and is inserted into a hollow portion 81a in a rod 81 of a boring machine 80 (for example, shown in FIG. 3) that excavates the ground to form a hole. Yes. 81 b is a blade portion attached to the tip of the rod 81, and 81 c is a joint portion of the rod 81. 41 is a for 2 material injection pipe of the present invention, and a hose 43 which is furnished in the pipe 42 and the pipe 42 as shown in FIG. 1 (a). The pipe 42 is formed from a material such as synthetic resin, and the hose 43 is formed from a material such as rubber or synthetic resin. This two-material injection tube 41 is a hardened material having a fast curing property (a two-material mixed type of hardened material having a relatively short gel time) which is hardened by mixing two materials of a cement-based main material and a hardening accelerator. The main material is passed through the hose 43, and the curing accelerator is passed through the pipe 42. The curing material is supplied from a curing material supply device 90 (for example, shown in FIG. 3). Further, the curing time of the curing material can be arbitrarily set by adjusting the amount of mixing of the main material and the curing accelerator. Reference numeral 44 denotes a joint pipe attached to the tip of the hose 43. A relay pipe 45 is press-fitted and attached to the tip of the pipe 42 and has a hose 43 and a joint pipe 44 penetrating therein. Reference numeral 46 denotes a compression ring that presses the pipe 42 inward to bring it into close contact with the relay pipe 45. 47 is a bag in the present invention. This bag body 47 is comprised from the bag formed with the knitted fabric etc. which consist of a synthetic fiber or a natural fiber, and the main material and the hardening acceleration material mix the 2 material mixing type hardening material inject | poured inside. It has a water permeability that allows it to penetrate until it is clogged. Reference numeral 48 denotes a storage member that stores the contracted bag body 47, and the upper end of the bag body 47 is closely fixed to the peripheral surface by an annular fixture 49. Reference numeral 50 denotes a protective cover attached around the bag body 47 and is detached from the bag body 47 when the bag body 47 expands.
[0013]
Reference numeral 51 denotes a mounting member in which the storage member 48 is screwed and fixed to the lower part, and the relay pipe 45 is joined to the upper part by a joining ring 52. Reference numeral 53 denotes an O-ring provided at a threaded portion between the mounting member 51 and the storage member 48, and reference numeral 54 denotes an annular seal packing provided at a joint portion between the mounting member 51 and the relay pipe 45. A step 51 a is formed on the mounting member 51, and the step 51 a engages with a protrusion 81 d formed on the joint 81 c of the rod 81 of the boring machine 80. Due to the engagement between the step portion 51 a and the convex portion 81 d, the mounting member 51 is restricted from moving in the F direction, and the bag body 47 fixed to the mounting member 51 via the storage member 48 is used as the blade portion of the rod 81. It arrange | positions in the hollow part 81a of 81b vicinity.
[0014]
A large opening / closing hole 51 b is formed at the center of the mounting member 51 . A female screw (not shown) is formed on the upper inner peripheral surface of the large opening / closing hole 51b, and a male screw (not shown) formed on the peripheral surface of the distal end portion 44a of the joint pipe 44 is screwed into the female screw. Thus, the mounting member 51 is connected to the joint pipe 44, and the inside of the joint pipe 44 and the inside of the storage member 48 are communicated by the large opening / closing hole 51b. The large opening / closing hole 51 b is closed by a sphere 56 urged in the B direction by a coil spring 55. A support ring 57 supports the coil spring 55 and is screwed into the large opening / closing hole 50b. 51c is a small through hole which is formed independently of the large opening hole 51b, FIG. 1 (b) (the figure is a C-C sectional view of FIG. 1 (a).) Large As shown in Four are formed around the opening / closing hole 51b. As shown in FIG. 1 (a), the inside of the relay pipe 45 and the inside of the storage member 48 are communicated with each other through the small through hole 51c. Each small through hole 51 c is closed by a sphere 59 urged in the B direction by a coil spring 58. A support ring 60 supports the coil spring 58 and is screwed into the small opening / closing hole 51c.
[0015]
By the joint pipe 44, the relay pipe 45, the mounting member 51, and the storage member 48, the bag body 47 is mounted at the tip of the two-material injection pipe 41, and the hardening material is inserted into the bag body 47 from the two-material injection pipe 41. An injection route for injecting the two main materials and the curing accelerator in an independent route is established. That is, the joint pipe 44, the relay pipe 45, the mounting member 51, and the storage member 48 constitute a mounting mechanism in the present invention .
[0016]
In the configuration as described above, when the main material of the two-material mixed type curing material is injected in the F direction from the hose 43 and at the same time, the curing accelerator is injected in the F direction from the pipe 42, the main material is inside the joint pipe 44. after having entered the large open hole 51b of the mounting member 51 through a further goes enters from the large open hole 51b inside the housing member 48 while pressing in the direction F as shown by a broken line a sphere 56 in FIG. 2 (c) After the hardening accelerator enters the small through hole 51c of the mounting member 51 through the inside of the relay pipe 45, the sphere 59 is further pushed from the small through hole 51c in the F direction as indicated by a broken line, while Go inside. Then, the main material and the curing accelerator that have entered the storage member 48 enter the inside of the bag body 47 while being mixed together, and the bag body 47 is expanded and expanded. At this time, since the protective cover 50 is detached from the bag body 47, the bag body 47 protrudes from the rod 81 while expanding. Then, when a predetermined amount of the main material and the curing accelerator are injected, and the bag body 47 and the storage member 48 are filled with the mixed main material and the curing accelerator, two materials from the hose 43 and the pipe 42 are obtained. Stop the injection. At this time, the large opening / closing hole 51 b of the mounting member 51 is closed by the sphere 56 urged in the B direction by the coil spring 55, and each small through hole 51 c is urged in the B direction by the coil spring 58. The two mixed materials that have entered the bag body 47 and the storage member 48 enter the inside of the joint pipe 44, the hose 43, the relay pipe 45, and the pipe 42 from the large opening / closing hole 51b and the small through hole 51c. Outflow is prevented. When the injection of the two materials is stopped, the mixed material filled in the bag body 47 and the storage member 48 is cured in a short time, and the expanded state of the bag body 47 is maintained. rotate to cut the bag body 47 in an expanded state at the edge portion 81b of the rod 81, disengaging from the dual-material for injection tube 41 as shown in Figure 2 (d). Since the bag body 47 has water permeability as described above, the two mixed materials that have entered the bag body 47 slightly pass through the bag body 47, but the two mixed materials are When the bag body 47 is clogged by curing, the two materials do not pass through the bag body 47, so that the expanded state of the bag body 47 is not maintained.
[0017]
3 to 6 are views for explaining a water stopping method according to the present invention. This construction method is carried out using the water stop device 104 described above. In FIG. 3 , W is a retaining wall as an installation in the ground G, H is an excavation shaft for constructing an underground structure formed by excavating the retaining wall W, and K is in the retaining wall W It is the bottom board. Z is a water leakage part of the earth retaining wall W including gaps between sheet piles constituting the earth retaining wall W and defects such as cracks in soil cement. The ground water in the ground G and the earth and sand are mixed with this from the water leakage part Z. It flows into the excavated shaft H. X is a gap generated in the ground G in the vicinity of the water leakage portion Z when groundwater and earth and sand flow out from the water leakage portion Z. In addition, since the space | gap X becomes a flow path, such as groundwater, it expands further from the magnitude | size shown in the figure. First, a plurality of sandbags D filled with earth and sand are stacked on the open shaft H side of the water leakage portion Z to suppress outflow of groundwater and the like. Then, by rotating the rod 81 of the boring machine 80 installed on the ground surface Ga in this state, the ground is excavated until the gap X is reached to form the hole V.
[0018]
Before or after forming the hole V by the rod 81, the bag body 47 is attached to the tip of the two-material injection pipe 41 of the water stop device 104 as described above . When forming a drilling V, while leaving the rod 81 into the drilling V, as shown in FIG. 1 (a), 2 materials for injection tube water cutoff device 104 to the hollow portion 81a of the rod 81 41 and a contracted bag body 47 attached to the tip of the injection tube 41 are inserted.
[0019]
Next, a predetermined amount injected curable material from 2 materials for injection tube 41 into the bag 47 to inflate the bag 47, as shown in Figure 4 (a). Then, as shown in FIG. 2 ( b ) , the rod body 81 is rotated to cut the bag body 47 by the blade 81 b , and the inflated bag body 47 is used for two materials as shown in FIG. 4 ( b ). It is detached from the injection tube 41 and left in the gap X. As a result, the left inflated bag body 47 falls in the gap X due to its own weight, and is pushed toward the retaining wall W as indicated by the dotted line by the groundwater flowing toward the water leakage portion Z.
[0020]
When disengaging the bag 47 from 2 materials for injection tube 41, after withdrawal of two materials for injection tube 41 from the rod 81 in the drilling V, contracting a new bag 47 at the distal end of the dual-material for injection tube 41 Wear in the state. Then, insert the bag 47 attached to the hollow portion 81a in both the rod 81 and 2 materials for injection pipe 41, by injecting a hardening material from 2 materials for injection tube 41 to inflate the bag body 47, as described above The inflated bag body 47 is cut with the blade 81 b of the rod 81 to be detached from the two-material injection pipe 1 and left in the gap X. When such a series of steps are repeated several times, a plurality of inflated bag bodies 47 are sequentially packed from the side of the retaining wall W into the gap X as shown in FIG. 5 ( c ). . When the above series of steps is repeated several times, the gap X is finally filled and filled with a plurality of inflated bag bodies 47 as shown in FIG. 5 ( d ). Become. This state is due to an abnormal increase in the supply pressure of the hardener supplied from the hardener supply device 90 to the two-material injection pipe 41 (by a pressure gauge (not shown) provided in the hardener supply device 90). It is easily estimated from the fact that the outflow from the water leakage part Z such as groundwater into the open shaft H is almost stopped. After that, as shown in FIG. 6 ( e ), the hardened material is poured from the two-material injection pipe 41 toward the bag body 47 left in the gap X. As a result, the cured material poured toward the bag 47 have infiltrated between the gap and the bag 47 and the earth retaining wall W between the bag body 47. Then, Ru fill drilling V Pull the rod 81 from the drilling V as shown in FIG. 6 (f). When the outflow from the groundwater leakage portion Z into the open shaft H is almost stopped, the hardened material in the bag body 47 has already been hardened, so that the work can be safely performed in the open shaft H immediately.
[0021]
As described above, was inserted into the hollow portion 81a of the rod 81 with the injection pipe 41 by attaching the bag 47 to the tip of the 2 materials for injection tube 41, after injection to inflate the curing material from the injection pipe 41 When the inflated bag body 47 is detached from the injection pipe 41 and left in the gap Z near the water leakage portion Z, the gap X is filled with the left inflated bag body 47 and the water flow path is blocked. Therefore, it is possible to stop the groundwater from flowing through the gap X to the leaking part Z, and to stop the outflow of groundwater from the leaking part Z. And since the hardening material in the bag body 47 hardens | cures, it will become possible to stop the outflow of the groundwater from the water leakage part Z reliably and permanently, and it will become possible to operate | work safely in the open shaft H. Moreover, since it is not necessary to use the long bag body according to the depth of the water leak part Z like patent document 1, compared with the method of patent document 1, it is a hardening material for inflating a bag body and a bag body. Such costs can be kept low. Further, by injecting the hardening material into the bag body 47 , the hardening material will not flow out into the open shaft H from the water leakage portion Z. Such costs do not increase.
[0022]
Also, by pouring the hardener from the injection tube 41 toward the bag 47 left in the gap X, the poured hardener penetrates between the gaps between the bags 47 and between the bag 47 and the retaining wall W. Therefore, by hardening the hardening material, it is possible to prevent the groundwater from flowing into the water leakage portion Z through the gap between the bag bodies 47 or between the bag body 47 and the retaining wall W. Further, the injection tube 41 and the bag body 47 by inserting into the hollow portion 81a of the rod 81 of the boring machine 80, while the drilling V is collapsing prevented by a rod 81, the injection pipe 41 and the bag body 47 the it is possible to reach steadily until the gap X, the injection tube 41 without receiving a pressure from the soil and groundwater in the ground G, it is possible to stably inject the curable material into the bag 47.
[0023]
In the embodiment described above, an example in which the water stoppage method according to the present invention is applied to stop the outflow of groundwater from the leakage portion of the retaining wall into the open shaft H is given. It is not limited to. In addition to this, for example, the wall surface of an underground building such as a basement or a subway station, or the wall of a civil engineering structure such as a tunnel or a mountain retaining wall is cracked, etc. It can also be applied to stop groundwater runoff. Moreover, it can also be applied to stop the outflow of water into the ground from a water leaking part such as a joint part of a water pipe installed in the ground or a missing part such as a crack.
[0024]
【The invention's effect】
According to the present invention, the hollow portion of the rod of the boring machine, insert the 2 materials for injection tube fitted with a bag to the tip, from the injection pipe and the main material of two materials of cure promoting material injected each bag After inflating the body , the rod is rotated, the inflated bag body is cut with the blade of the rod, detached from the injection tube, and left in the vicinity of the water leakage part, so that the left inflated bag body Since it is possible to stop the flow of water, it is possible to stop the outflow of water from the water leakage part, and since there is no need to use a long bag body, the bag body and a curing material for inflating the bag body and Cost can be kept low.
[Brief description of the drawings]
FIG. 1 is a view showing a water stop device according to the present invention.
FIG. 2 is a view showing a water stop device according to the present invention.
FIG. 3 is a view for explaining a water stop method according to the present invention.
FIG. 4 is a view for explaining a water stop method according to the present invention.
FIG. 5 is a diagram for explaining a water stop method according to the present invention.
FIG. 6 is a view for explaining a water stop method according to the present invention.
FIG. 7 is a diagram for explaining a conventional problem .
[Explanation of symbols]
41 Injection pipe for two materials 44 Joint pipe 45 Relay pipe 47 Bag body 48 Storage member 51 Mounting member 81 Rod
81a hollow part
81b blade 104 water stop device G ground
W retaining wall
V drilling hole X gap
Z water leakage part

Claims (2)

A water stop device that stops the outflow of water from the water leakage part of the installed object in the ground,
A two-material injection pipe for injecting the two materials of the hardened material having a fast curing property by mixing the two materials of the main material and the hardening accelerator material through independent paths;
A bag body that expands when the two materials are injected therein;
A mounting mechanism that attaches the bag body to the tip of the two-material injection pipe and establishes an injection path for injecting the two materials into the bag body from the two-material injection pipe through an independent path ;
The two-material injection pipe is inserted into a hollow portion in a rod of a boring machine that excavates the ground to form a hole.
The bag is disposed in the vicinity of the blade provided at the tip of the rod,
By rotating the rod, the bag material in an inflated state is hardened by the two materials injected therein, and is cut with the blade portion to be detached from the injection tube for the two materials. Water stop device. A water stop construction method that stops the outflow of water from the water leakage part of the installation in the ground using the water stop device according to claim 1 ,
Excavating the ground with the rod to form a hole until reaching a void generated in the ground due to water flowing out from the water leakage part,
The bag body and inserted with said dual-material for injection tube into the hollow portion of the rod that left on the drilling,
The bag is disposed in the vicinity of the blade provided at the tip of the rod,
Inflating the bag body by injecting 2 material from the 2 materials for injection tube,
By rotating the rod, the bag body 2 material injected therein is in an expanded state and cured, and cut with the cutting unit is detached from the dual-material for injection tube, left in the gap A water-stop construction method characterized by

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