JP2013204398A - Seal member between piles - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with a large-scale apparatus when a section between piles is sealed, and to sufficiently obtain seal performance by easily installing a seal member between the piles without damaging it.SOLUTION: A seal member 1 installed between piles 100 seals a section between the piles 100 by being expanded until it is brought into intimate contact with an outer peripheral surface of the pile 100 by an expansion force when a water-expansive agent elongated in the longitudinal direction of the pile 100 and housed inside is expanded by water absorption.

Description

  The present invention relates to a seal member between piles disposed between steel pipe piles, for example.

  Conventionally, a water-impervious wall or the like has been constructed using steel pipe piles. In this case, it has been devised to secure the water stoppage by disposing a seal member as disclosed in, for example, Patent Document 1 between steel pipe piles.

  The seal member of Patent Document 1 is made of an elastic member, and the seal member before being installed between the steel pipe piles is elastically deformed so as to become thin by pulling in the longitudinal direction of the piles. Insert into. Thereafter, by removing the tensile force, the shape of the seal member is restored and is in close contact with the outer surface of the steel pipe pile.

JP 2006-241894 A

  Since the sealing member of Patent Document 1 is elastically deformed thinly before being inserted between the steel pipe piles, there is an advantage that it is possible to suppress damage to the sealing member due to sliding contact with the outer surface of the steel pipe piles. The length of the steel pipe pile may exceed 10 meters depending on the construction site, and there is a possibility that the apparatus becomes large in order to pull such a long seal member in the longitudinal direction.

  Further, since the water pressure applied to the lower part of the seal member after the construction is assumed to be considerably large, the hardness of the seal member must be set to a certain degree in advance so as to withstand the water pressure. In order to extend the seal member having such a hardness in the longitudinal direction as described in Patent Document 1, a very large force is required, and it may be difficult to deform itself. Moreover, it is conceivable that an effective construction method at the construction site cannot be established if the sealing member is long as described above.

  The present invention has been made in view of such a point, and the object of the present invention is that when sealing between piles, a large-scale device is not required and the seal member is not damaged between piles. It is to make it possible to obtain a sufficient sealing performance.

  In order to achieve the above object, in the present invention, a seal body is expanded using a water expansion agent to seal between piles.

  1st invention is the sealing member installed between piles, In the sealing member for sealing between these piles, While extending in the longitudinal direction of a pile, the expansion | swelling at the time of the water expansion | swelling agent accommodated in the inside being expanded by absorption of water It is comprised so that it may expand | swell until it may closely_contact | adhere to the outer peripheral surface of the said pile by force, and it seals between piles.

  According to this configuration, since the seal member is not expanded before water is absorbed by the water expansion agent, damage to the seal member due to sliding contact with the outer peripheral surface of the pile when installed between the piles is suppressed.

  And after installing a sealing member between piles, when a water expansion agent is made to absorb water and a water expansion agent is expanded, a sealing member will expand by the expansion force.

  According to a second invention, in the first invention, the seal main body containing the water-swelling agent and the first and second seals disposed at both ends in the longitudinal direction of the seal main body and configured to cover the ends. It is characterized by comprising a second member and a connecting member for connecting the first and second members and setting the distance between the first and second members to be a predetermined dimension or less.

  According to this structure, since the space | interval of a 1st and 2nd member shall be below a predetermined dimension, it is suppressed that a seal body expand | swells so that it may extend in a longitudinal direction. Thereby, it becomes possible to use the expansion force of the water expansion agent effectively so that the seal body expands in the direction in which the seal main body is in close contact with the outer peripheral surface of the pile, so that the seal main body can be securely attached to the outer peripheral surface of the pile. .

  In a third aspect based on the second aspect, the connecting member is accommodated in the seal body.

  According to this configuration, since the connecting member is not exposed to the outside of the seal body, it does not interfere with the construction.

  In a fourth aspect based on the third aspect, the seal main body is installed between the piles so that the first member is located on the top, and the first member includes a water expansion member and water. A water inlet for supplying water is formed so as to communicate with the inside of the seal body.

  According to this structure, a 1st member will be located above in the state which installed the seal main body between piles, and it becomes possible to supply water to a water expansion member from the water inlet of this 1st member.

  According to a fifth invention, in the fourth invention, a water guide pipe connected to the water inlet and extending downward and guiding water injected into the water inlet is provided inside the seal body. It is characterized by being.

  According to this configuration, when water is injected into the water inlet, it is possible to guide the water to the lower part of the seal body by the water guide pipe, so that the water expansion member accommodated in the lower part of the seal body is also reliably expanded.

  According to the first invention, after the seal member is installed between the piles, the seal member can be inflated by the expansion force of the water expansion agent accommodated therein to seal between the piles. This eliminates the need for a large-scale device for pulling the seal member, and allows the seal member to be easily installed.

  According to the second invention, the expansion direction is controlled so that the seal body does not extend in the longitudinal direction by the first and second members, and it is surely expanded in the direction in close contact with the outer peripheral surface of the pile. It is possible to securely seal between the piles by effectively utilizing the expansion force of the water expansion agent.

  According to the third aspect of the invention, since the connecting member that connects the first and second members is accommodated in the seal body, the connecting member can be kept out of the way during construction, and the workability can be improved. can do.

  According to the fourth invention, since the water injection port for supplying water to the water expansion member is formed in the first member located on the seal body, the water is expanded after the seal member is installed between the piles. It can be easily supplied to the member.

  According to the fifth invention, since the water guide pipe extending downward is arranged inside the seal body, the water expansion member accommodated in the lower part of the seal body can be reliably expanded, Sealability can be further enhanced.

It is a figure which shows the state which sealed between piles using the sealing member concerning embodiment. It is a figure which shows the state which has arrange | positioned the sealing member before expansion between piles. It is a longitudinal cross-sectional view of a sealing member. It is a horizontal sectional view of a seal member. FIG. 6 is a diagram corresponding to FIG. 4 according to Modification 1; FIG. 9 is a view corresponding to FIG. 4 according to Modification 2. FIG. 10 is a diagram corresponding to FIG. 4 according to Modification 3.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  Drawing 1 is a figure showing the state where piles 100 and 100 were sealed using seal member 1 between piles concerning the embodiment of the present invention.

  The seal member 1 includes a cylindrical seal body 10, a water expansion agent A (shown in FIGS. 3 and 4) filled in the seal body 10, and one longitudinal end portion (upper end portion) of the seal body 10. The first plate member (first member) 21 provided, the second plate member (second member) 22 provided at the other longitudinal end (lower end) of the seal body 10, the first plate member 21 and the second plate member. The steel wire (connecting member) 23 which connects 22 and the 1st and 2nd water conduits 24 and 25 are provided.

  The seal body 10 has a shape that is long in the longitudinal direction of the pile 100, and is made of a water-impermeable material such as rubber. The seal body 10 is configured to expand by an outward force acting on the inside of the seal body 10. The force required for the expansion of the seal body 10 can be arbitrarily set according to the elastic force of the material constituting the seal body 10, the structure of the seal body 10, the wall thickness, etc. In this embodiment, the water expansion agent A It can be expanded by the expansion force.

  As shown in FIG. 4, the seal body 10 has a substantially circular cross section, and the wall thickness is substantially uniform. As shown in FIG. 2, the outer diameter of the seal body 10 is set to be shorter than the separation dimension of the piles 100 and 100 in a state before expansion. Moreover, the length of the seal body 10 is set to be approximately the same as the length of the portion of the pile 100 that needs to be water-stopped.

  The first plate member 21 is formed in a substantially circular shape that covers the upper end portion of the seal body 10. The outer diameter of the first plate member 21 is set to be substantially the same as the outer diameter of the seal body 10 after expansion (indicated by a phantom line in FIG. 3). Further, the first plate member 21 has a rigidity that is not deformed by the expansion force of the water expansion agent A, such as a thick steel plate. The lower surface of the first plate member 21 is bonded to the upper end portion of the seal body 10, so that water does not leak from between the first plate member 21 and the seal body 10.

  The first plate member 21 is formed with two water inlets 21a, 21a penetrating in the thickness direction. The water injection ports 21a and 21a are for supplying water to the water expansion agent A inside the seal body 10, and are arranged at intervals.

  The second plate member 22 is made of the same material as the first plate member 21 and is formed in the same size as the first plate member 21. No opening is formed in the second plate member 22. The upper surface of the second plate 22 is bonded to the lower end of the seal body 10 so that water does not leak.

  The steel wire 23 is housed inside the seal body 10, one end is fixed to the substantially central portion of the first plate member 21, and the other end is fixed to the substantially central portion of the second plate member 22.

  The length of the steel wire 23 is such that the lower surface of the first plate 21 is in contact with the upper end of the seal body 10 and the upper surface of the second plate 22 is at the lower end of the seal body 10 before the seal body 10 expands. It is set so that the contact state can be maintained. Further, the steel wire 23 has sufficient strength so that the first and second plate materials 21 and 22 are displaced by the expansion of the water expansion agent A and are hardly stretched when a tensile force is applied to the displacement. doing. Thereby, the space | interval of the 1st and 2nd board | plate materials 21 and 22 is set so that it may become below the dimension of the longitudinal direction of the seal body 10 which is a predetermined dimension.

  The first and second water conduits 24 and 25 are for guiding the water injected into the water injection ports 21 a and 21 a downward, and are accommodated inside the seal body 10. The first water conduit 24 extends downward from one inlet 22 a of the first plate member 21, and the second water conduit 25 extends downward from the other inlet 22 a of the first plate member 21. Yes. The lower ends of the first and second conduit pipes 24 and 25 are located near the lower portion of the seal body 10. A large number of water outlets 24a and 25a are formed in the peripheral wall portions of the first and second conduit pipes 24 and 25 from the upper part to the lower part. Water flowing through the first and second conduits 24 and 25 is discharged from the water outlets 24a and 25a.

  The water expansion agent A has a conventionally known urethane as a main component and absorbs water to expand. The water expansion agent A is accommodated from the upper part to the lower part of the seal body 10.

  Next, the case where the water stop between the piles 100 and 100 is performed using the sealing member 1 comprised as mentioned above is demonstrated.

  In addition, the pile 100 is a steel pipe pile, and the front end side is embedded in the ground. Moreover, the pile 100 is used when constructing a water blocking wall or the like, for example.

  First, the seal member 1 in a state where water is not supplied to the water expansion agent A is inserted between the piles 100 and 100. At this time, as shown in FIG. 2, since the outer diameter of the seal body 10 is shorter than the dimension between the piles 100, 100, the seal body 10 is less likely to be in sliding contact with the outer peripheral surface of the pile 100, and thus the seal body 10 is damaged. Is suppressed.

  After inserting the sealing member 1 between the piles 100 and 100 as described above, water is injected into the water injection ports 21 a and 21 a of the first plate member 21. The water injected into the water injection ports 21a, 21a flows downward through the first and second water conduits 24, 25 and inside the seal body 10. The water flowing through the first and second water conduits 24 and 25 is discharged from the water outlets 24a and 25a and absorbed by the surrounding water expansion agent A. Thus, it becomes possible to expand all the water expansion agents A by discharging water from the upper part inside the seal body 10 to the lower part.

  When the water expansion agent A expands, an outward force acts on the inside of the seal body 10 due to the expansion force, whereby the seal body 10 expands. When the water expansion agent A expands, an upward force acts on the lower surface of the first plate member 21, and the first plate member 21 and the second member 22 are connected by a steel wire 23, and the distance between them is the seal body 10. Therefore, the first plate 21 does not move upward, and the second plate 22 does not move downward. As a result, the expansion force of the water expansion agent A is prevented from escaping in an unnecessary direction (vertical direction) of expansion, and acts only in the radial direction of the seal body 10. Therefore, the seal main body 10 can be expanded to ensure that the outer peripheral surface of the seal main body 10 is brought into contact with the outer peripheral surfaces of the piles 100 and 100 to ensure water-stopping.

  As described above, according to the seal member 1 according to this embodiment, after the seal body 10 is installed between the piles 100, 100, the seal body 10 is expanded by the expansion force of the water expansion agent A accommodated therein. Since the piles 100 and 100 can be sealed, a large-scale device for pulling the seal member as in the conventional example is not necessary, and the seal member 1 can be easily installed. The first and second plate members 21 and 22 control the expansion direction so that the seal body 1 does not extend in the longitudinal direction, and expand in a direction in close contact with the outer peripheral surfaces of the piles 100 and 100. It is possible to securely seal between the piles 100 and 100 by effectively utilizing the expansion force of the expansion agent A.

  Moreover, since the steel wire 23 that connects the first and second plate members 21 and 22 is accommodated in the seal body 10, the steel wire 23 can be prevented from being obstructed during construction, and the workability can be improved. can do.

  Moreover, since the water injection ports 21a and 21a for supplying water to the water expansion member A were formed in the 1st board | plate material 21 located on the seal body 10, after installing the seal member 1 between the piles 100 and 100, Water can be easily supplied to the water expansion member A.

  In addition, since the water guide pipes 24 and 25 extending downward are disposed inside the seal body 10, the lower water expansion member A can also be reliably expanded, thereby further improving the sealing performance. Can do.

  Moreover, in this embodiment, since the water expansion member A is covered with the seal body 10 that does not allow water to pass therethrough, for example, even if seawater exists outside the seal body 10, the seawater reaches the water expansion member A. No, the water expansion member A weak against seawater can be protected.

  In the above embodiment, the thickness of the seal body 10 is substantially the same over the entire circumference. However, the thickness is not limited to this, and for example, the thickness is partially changed as in Modifications 1 to 3 shown in FIGS. It may be thinned.

  In the first modification shown in FIG. 5, the shape of the inner hole of the seal body 10 is set so that thin portions 10 c and 10 c are formed at two locations in the circumferential direction of the seal body 10. The thin portions 10c and 10c are formed so as to be point-symmetric with the center of the seal body 10 as the center of symmetry. The seal body 10 of the first modification is installed so that the piles 100 and 100 correspond to the thin portions 10c and 10c of the seal body 10. When the water expansion agent A expands, the thin-walled portions 10c, 10c of the seal body 10 are more easily deformed than the other portions, and therefore extend while curving outward as indicated by phantom lines. Expands and contacts the outer peripheral surface of the piles 100 and 100.

  In the modified example 2 shown in FIG. 6, bent thin portions 10 d and 10 d that are bent at two locations in the circumferential direction of the seal body 10 are provided. The bent thin portions 10d and 10d are formed to be point symmetric with the center of the seal body 10 as the center of symmetry. The seal body 10 of Modification 2 is installed such that the piles 100 and 100 correspond to the bent thin portions 10d and 10d of the seal body 10. When the water expansion agent A expands, the bent thin-walled portions 10d and 10d of the seal body 10 are more easily deformed than the other parts, so that the seal body 10 expands outward as indicated by the phantom line. 10 expand | swells and contacts the outer peripheral surface of the pile 100,100.

  Moreover, you may provide the expansion suppression members 12 and 12 in a part of seal body 10 like the modification 3 shown in FIG. The expansion suppressing members 12 and 12 are made of a material that is less likely to be deformed than the material of the seal body 10 and are, for example, a steel plate or a hard plastic. The expansion suppressing members 12, 12 are formed in a curved plate shape that covers the outer surface of the seal body 10, are arranged so as to be point-symmetric with the center of the seal body 10 as the center of symmetry, and are formed on the outer peripheral surface of the seal body 10. It is fixed. The seal body 10 according to the third modification is installed so that the piles 100 and 100 correspond to portions where the expansion suppressing members 12 and 12 are not provided. When the water expansion agent A expands, the portion of the seal body 10 that is covered with the expansion suppressing members 12 and 12 is suppressed from expanding, so that the portion without the expansion suppressing members 12 and 12 expands as indicated by phantom lines. Then, it contacts the outer peripheral surface of the piles 100 and 100.

  Further, the connecting member may be, for example, a wire other than the steel wire.

  Moreover, in the said embodiment, although the 1st and 2nd water conduits 24 and 25 are provided, you may abbreviate | omit not only this but the 1st and 2nd water conduits 24 and 25. FIG. In this case, the water injected from the water injection ports 21a and 21a of the first plate member 21 is absorbed by the water expansion agent A while flowing from top to bottom.

  As described above, the sealing member according to the present invention can be used, for example, when sealing between steel pipe piles.

DESCRIPTION OF SYMBOLS 1 Seal member 10 Seal main body 21 1st board | plate material (1st member)
21a Water injection port 22 Second plate (second member)
23 Steel wire (connecting member)
24 1st water conduit 24a Water outlet 25 2nd water conduit 25a Water outlet 100 Pile A Water expansion agent

Claims (5)

In the sealing member installed between the piles and sealing between the piles,
While extending in the longitudinal direction of the pile, it is configured to expand and seal between the piles by the expansion force when the water expansion agent accommodated inside expands by absorbing water until it closely contacts the outer peripheral surface of the pile. The sealing member characterized by the above-mentioned. The seal member according to claim 1,
A seal body containing the water expansion agent;
A first member and a second member, which are respectively disposed at both ends in the longitudinal direction of the seal body, and are formed so as to cover the ends;
A sealing member comprising: a connecting member for connecting the first and second members and setting the distance between the first and second members to be a predetermined dimension or less. The seal member according to claim 2,
The seal member, wherein the connecting member is accommodated inside the seal body. The sealing member according to claim 3,
The seal body is installed between the piles so that the first member is positioned on the top,
The seal member, wherein the first member is formed with a water inlet for supplying water to the water expansion member so as to communicate with the inside of the seal body. The seal member according to claim 4,
A seal member, characterized in that a water guide pipe connected to the water inlet and extending downward and guiding water injected into the water inlet is disposed inside the seal body.

Images