JP6505487B2 - Grout seal structure and backup material for grout seal - Google Patents

Description

  The present invention relates to a seal structure of grout material and a backup material for grout seal material.

  There is a jacket method in which a sheath pipe on the structure side is extrapolated to a pile driven into the ground, grout material is filled between the pile and the sheath pipe, and solidified and fixed and integrated, between the pile and the sheath pipe Grout sealing material is attached to the case to prevent the outflow of the grout material.

  As a grout seal material which seals between a pile and a sheath pipe, there is a grout seal material indicated, for example in patent documents 1. This grout seal material is an elastic material, and has a cross-sectional shape with a short cylindrical fixing portion attached to the inner peripheral surface of the sheath pipe and an annular sealing portion protruding horizontally from the lower end edge of the fixing portion. It is formed in an L shape.

  When inserting the sheath pipe into the preceding pile, depending on the placement accuracy of the pile and the influence of the ground, the inner diameter of the sheath pipe needs to be increased, and the clearance between the pile and the sheath increases (clearance). A grout seal material that can be sealed is required.

Unexamined-Japanese-Patent No. 2005-307583

However, in the grout seal material of Patent Document 1, in order to be able to cope with a large play space, the inner diameter of the open contact portion in contact with the outer peripheral surface of the pile must be reduced, and for inserting into the pile. The load increases. Also, depending on the size of the inner diameter of the open contact portion, there may be a problem that the grout seal material breaks.
In addition, with grout seal materials, it is usually necessary to increase the frictional force of the open contact parts in contact with the outer peripheral surface of the pile when it is necessary to increase the placement (filling) height of the grout material. There is a limit, especially when the clearance between the pile and the sheath increases, the load resistance of the grout seal material can not be maintained relative to the amount of grouting material placed, and the contact part is reversed and the grout material leaks, or the grout material There is a problem that it can not be placed (filled) at once, but must be done in two steps.

  The present invention has been made in view of the above-mentioned problems of the prior art, and even if the clearance between the pile and the sheath is large, insertion of the grout seal material into the pile is easy without causing damage, and It is an object of the present invention to provide a grout seal structure and a back-up material for grout seal, which do not need to divide the grout filling required twice regardless of the size of the play space.

In order to achieve the above object, a grout seal structure according to a first aspect of the present invention is:
A grout material seal structure for sealing a grout material filled in a gap between a pile and a sheath pipe externally fitted to the pile and fixing and integrating the pile and the sheath pipe with the grout material. ,
A fixing portion attached to an inner circumferential surface of the sheath pipe;
A grout seal portion having a contact portion extended to the fixed portion and attached to the outer peripheral surface of the pile and coming into contact with the outer peripheral surface of the pile to seal by elastic deformation, thereby supporting the grout material Make up grout seal material,
The base end is attached to the inner circumferential surface of the sheath at a predetermined angle and is allowed to rotate upward, so that the fluctuation between the play of the pile and the sheath is small. A back-up material which allows the load of the grout material to be supported by allowing the tip end of which downward rotation is restricted from the predetermined angle to hold the contact state of the contact portion on the lower side of the contact portion Provided
It is characterized by

Further, in the grout seal structure, the grout seal is formed to have a thickness that suppresses the elongation in the circumferential direction to a predetermined amount by the load of the grout in a state where the contact portion is supported by the backup material. The slip at the contact portion may be suppressed.

Moreover, the said backup material may be comprised by which the said front-end | tip part is provided along the lower surface of the said grout sealing material.

The grout seal material is attached via a base ring on which the fixing portion is welded to the sheath pipe,
The backup material may be attached to the base ring at a base end at a predetermined angle.

In order to achieve the above object, a backup material for a grout seal material according to a second aspect of the present invention is:
An elastic body for supporting the grout material for sealing a grout material filled in a gap between a pile and a sheath pipe externally fitted to the pile and fixing and integrating the pile and the sheath pipe with the grout material Backup material for grout sealing material,
A plurality of members are disposed below the grout seal material, and the base end portion is attached to the inner peripheral surface of the sheath at a predetermined angle to allow upward rotation, so that the variation between the play of the pile and the sheath Of the grout material by holding the contact state of the contact portion on the lower side of the contact portion where the tip end whose rotation downward from the predetermined angle is restricted contacts the outer peripheral surface of the pile Configured to be supportable,
It is characterized by

  Further, in a backup material for grout seal material, the base material of the backup material is fixed to the inner peripheral surface of the sheath at a predetermined angle, and is connected by a connecting pin around the horizontal axis toward the distal end. The plurality of link members may be provided, and the connecting portion of each link member may be provided with a restricting member which is permitted to rotate upward and restricts downward rotation from the predetermined angle.

Further, the backup material may be formed of a spring material in which the base end portion is fixed at a predetermined angle, and may be configured to be able to support the contact portion while allowing variation between play due to elastic deformation.
Here, the grout material is a fluid liquid filled in the gap between the pile and the sheath pipe, and includes any of cement (mortar), glass, and synthetic resins such as urethane.

  According to the present invention, even if the play space between the pile and the sheath is large, it is easy to insert the grout seal material into the pile without causing any damage, and the grout material required regardless of the size of the play space. There is no need to divide the filling twice.

BRIEF DESCRIPTION OF THE DRAWINGS It is a top view which shows the arrangement | positioning of the partial cross section figure and backup material concerning one Embodiment of the sealing structure of grout material of this invention, and the backup material for grout sealing materials. It is a partial expansion longitudinal cross-sectional view concerning one embodiment of the present invention. It is a top view which shows arrangement | positioning of the backup material concerning one embodiment of this invention, and the partial expansion longitudinal cross-sectional view at the time of maximum eccentricity and minimum eccentricity. It is a top view showing a partial cross section concerning a seal structure of grout material of the present invention, and another embodiment of a backup material for grout seal material, and arrangement of a backup material. It is a partial expansion longitudinal cross-sectional view concerning other one embodiment of this invention. They are a top view which shows arrangement | positioning of the backup material concerning other one embodiment of this invention, and a partially expanded longitudinal cross-sectional view at the time of maximum eccentricity and minimum eccentricity.

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a seal structure for grout material and a backup material for grout seal material according to the present invention will be described in detail below with reference to the drawings.
In the grout seal structure 100 of the present invention, the grout seal material 10 is interposed between the pile 1 and the sheath pipe 2 externally inserted into the pile 1 to seal the grout material to be filled, and the grout seal By supporting the contact portion 32 in contact with the outer peripheral surface 1a of the pile 1 of the material 10 from the lower side with the backup material 50 of the present invention, the slip of the contact portion 32 can be suppressed and the load by the grout material can be supported. .
For example, as shown in FIG. 1, the grout seal material 10 is formed in an approximately L-shaped cross section by an elastic body such as synthetic rubber or natural rubber. The grout seal material 10 includes a short cylindrical fixing portion 20 attached to the inner peripheral surface 2 a of the sheath tube 2 and an annular grout seal portion 30 horizontally extended from the upper end edge of the fixing portion 20. It is done.

The fixing portion 20 is formed in a short cylindrical shape having an outer diameter matched to the inner peripheral surface 2a of the sheath tube 2 to be attached, and for example, as shown in FIG. The inner surface of the base ring 21 is attached by vulcanization bonding or the like. The fixing portion 20 can attach the grout seal material 10 to the sheath tube 2 via the fixing portion 20 by welding the base ring 21 to the inner peripheral surface of the sheath tube 2 all around.
Although attachment of the fixing portion 20 to the inner peripheral surface 2a of the sheath tube 2 is not shown, a stud bolt is implanted in the sheath tube 2 and the fixing portion 20 in which a bolt hole is formed in advance is attached to the stud bolt You may make it tighten with a nut via a holding plate.

The grout seal portion 30 is formed with an opening 31 smaller in diameter by a predetermined amount than the pile 1. The diameter of the opening 31 is set to a predetermined small diameter based on the size of the clearance (clearance) between the pile 1 to which the grout seal material 10 is attached and the sheath pipe 2 and the outer diameter of the pile 1. Thereby, by elastically deforming the opening part 31, it is set as the magnitude | size which can be inserted in the pile 1 without producing damage, such as a cutting | disconnection.
In a state in which the grout seal portion 30 elastically deforms the opening 31 and is attached to the outer peripheral surface 1a of the pile 1, for example, as shown in FIG. 3 (b) A contact portion 32 in contact with the outer circumferential surface 1a is formed.
In the contact portion 32, the outer peripheral surface 1a of the pile 1 and the inner peripheral surface 2a of the sheath pipe 2 are the farthest from each other, as shown in FIG. The seal contact width contacting the outer peripheral surface of the pile 1 changes from the minimum to the maximum.
When the pile 1 and the sheath tube 2 are eccentric, if one side is the maximum eccentricity, the opposite side sandwiching the central axis is the minimum eccentricity.

In the grout seal structure 100, a plurality of backup members 50 are radially disposed under the fixed portion 20 of the grout seal member 10. For example, eight backup members 50 are arranged at equal intervals in the circumferential direction. It is
Each backup material 50 is fixed to the base ring 21 at its base end and provided so as to protrude obliquely upward, and the tip end portion supports the contact portion 32 of the grout seal material 10 so that the outer peripheral surface 1 a of the pile 1 and It is designed to hold the contact state of
For this reason, even if the gap between the pile 1 and the sheath tube 2 changes, each backup material 50 can be deformed to allow this, and the contact portion 32 of the grout seal material 10 at the tip end portion is deformed even in a deformed state. It is made to be supportable.
That is, as shown in an enlarged manner in FIG. 2, the backup material 50 is configured in a substantially chain shape by connecting a plurality of link members 51 by horizontal connection pins 52. The link member 51a at the most proximal end is fixed to the fixing fitting 53 welded to the base ring 21 so as to protrude obliquely upward and can not be rotated. In the other link members 51 except for the most proximal end, a plate-shaped regulating member 54 for regulating the rotation is attached by welding or the like to the lower side of the link member 51 behind the connecting pin 52. It is supposed to stick out.
Thereby, the link member 51 on the front side by the connecting pin 52 is restricted from rotating clockwise downward around the connecting pin 52 on the paper surface of FIGS. Upward pivoting is permitted. In addition, although regulation of the rotation direction of the link member 51 is opposite to sandwich the central axis, upward rotation is permitted, and downward rotation is restricted.
Therefore, even if the gap between the pile 1 and the sheath pipe 2 changes, the backup material 50 can be deformed to allow the change as shown in FIG. 3, and the contact of the grout seal material 10 at the tip portion The portion 32 can be supported physically from the lower side, and the contact state of the contact portion 32 with the outer peripheral surface 1 a of the pile 1 can be maintained.

In the grout seal structure 100 configured by the grout seal material 10 and the backup material 50 configured as described above, first, the number of fixtures 53 for fixing the backup material 50 to the inner peripheral surface of the base ring 21 is required at equal circumferential intervals. For example, eight are fixed by welding or the like and attached together with the link member 51a at the most proximal end.
Furthermore, the grout seal material 10 is attached to the base ring 21 by attaching the fixing portion 20 of the grout seal material 10 to the upper side of the fixing bracket 53 by vulcanization bonding or the like. Then, the link member 51 is connected to the link member 51 a of the most proximal end fixed to the fixing bracket 53 on the lower side of the grout seal material 10 by the connection pin 52 to assemble the backup material 50.
Next, the base ring 21 is attached to the inner circumferential surface of the sheath tube 2 by welding all around, so that the sheath tube 2 and the fixing portion 20 are sealed. As a result, the grout seal material 10 and the backup material 50 are attached to the inner peripheral surface of the sheath 2.

Thereafter, the grout seal material 10 and the backup material 50 are inserted into the pile 1 together with the sheath pipe 2.
When the grout seal material 10 is inserted into the pile 1, the opening 31 of the grout seal portion 30 is put on the pile 1, and the opening 31 is elastically deformed and spread. At the same time, the backup material 50 is rotated and inserted without being restricted by the restriction member 54.
Then, since the grout seal material 10 only has a small diameter at the opening 31, it can be inserted easily by preventing damage even if it is spread, and it is elastically deformed without increasing the insertion load. The contact part 32 to the outer peripheral surface 1a of the pile 1 can be formed.
Further, according to the gap between the pile 1 and the sheath pipe 2, for example, as shown in FIG. 3 (b) on the maximum eccentricity side, as shown in FIG. 3 (c) on the minimum eccentricity side. At the same time as the contact portion 32 of the grout seal portion 30 of the grout seal material 10 contacts the outer peripheral surface 1 a of the pile 1, the lower side of the contact portion 32 is physically supported by the tip of the backup material 50.
Thus, the sheath tube 2 is inserted to a predetermined position of the stake 1.
Next, a grout material is filled on the grout seal portion 30 between the pile 1 and the sheath tube 2 so that the load of the grout material can be applied to the friction force of the contact portion 32 of the grout seal portion 30 and the physical support of the backup material 50 Support by force and keep the grout material sealed.
Thereby, the sheath pipe 2 can be fixed and integrated with the pile 1 by solidifying the grout material.

Thus, in the grout seal structure 100 provided with the backup material 50 for physically supporting the contact portion 32 of the grout seal material 10, the friction force of the contact portion 32 is the case with the grout seal material 10 alone. When the load due to the grout material increases, the contact portion 32 slides and the grout material can not be sealed, but the backup material 50 can physically support the lower side of the contact portion 32 and the sliding of the contact portion 32 It can be suppressed.
Thereby, even when the play space between the pile 1 and the sheath pipe 2 is large and the frictional force of the contact portion 32 of the grout seal material 10 is insufficient, the sealing state of the grout material can be secured.
Furthermore, even if it is necessary to increase the placement height of the grout material, the frictional force of the contact portion 32 can be compensated by the backup material 50, eliminating the need for double placement, and the required grout height 1 It can be driven in degrees.

  Further, since the backup member 50 is connected to the plurality of link members 51 by the connection pin 52, the upward rotation is permitted by the restriction member 54, and the downward rotation is restricted. The contact state of the contact portion 32 of the sealing material 10 can be physically supported, and changes in the play between the pile 1 and the sheath 2 can also be accommodated.

  Further, in the grout seal structure 100, the physical support of the contact portion 32 by the backup material 50 is performed at the installation position of the backup material 50, but the contact portion 32 is prevented from slipping even between the installation positions. For this purpose, the circumferential extension of the grout seal portion 30 of the grout seal material 10 is suppressed to a predetermined amount. That is, the thickness of the grout seal portion 30 of the grout seal material 10 is set so as to suppress the expansion to such an amount (predetermined amount) that the contact portion 32 does not slip even if the expansion in the circumferential direction occurs.

In the above embodiment, the backup member 50 is formed in a substantially chain shape in which the link member 51 is connected by the connection pin 52, but the link member 51 is formed of round steel or the like and connected by the connection pin The shape of the member 51 may be determined as appropriate.
In the above embodiment, the backup material 50 is installed under the grout seal material 10 with a space left, but the backup material 50 may be installed along the lower surface of the grout seal material 10, or It may be installed so as to be embedded in the grout seal portion 30 of the grout seal material 10, and the installation position may be appropriately changed as long as it is possible to support the load of the grout material and physically support the contact portion 32.

Next, another embodiment of a grout seal structure and a backup material for the grout seal according to the present invention will be described with reference to FIGS.
This embodiment differs in the configuration of the backup material 50A that physically supports the grout seal material 10.
The backup material 50A allows the backup material body 56, the mounting bracket 57 for rotatably attaching the base end portion of the backup material body 56, and the upward rotation, and restricts the downward rotation from a predetermined angle. And a restricting member 58.
For example, as shown in FIG. 4, a plurality of backup materials 50A are radially disposed below the fixed portion 20 of the grout seal material 10. For example, eight backup materials 50A are disposed at equal intervals in the circumferential direction. .
Each backup member 50A is attached to a mounting bracket 57 whose base end portion is welded to the base ring 21, and the backup member main body 56 is provided so as to protrude substantially horizontally at a predetermined angle. Further, as shown in FIG. 6, the mounting fitting 57 may be attached to the sheath pipe 2 directly by welding or the like.
The backup material body 56 is made of, for example, round steel having a circular cross-sectional shape.
The backup material main body 56 is not limited to a round steel, and may have another cross-sectional shape, and may be made of a synthetic resin material without being limited to a metal material.
The mounting bracket 57 is fixed to the base ring 21 of the grout seal material 10 by welding or the like, as shown in FIGS. 4 and 5. The base end portion of the backup material main body 56 is rotatably attached to the mounting bracket 57 via a pivot shaft 59.
The restricting member 58 is for allowing the upward rotation of the backup material main body 56 and for restricting the downward rotation from a predetermined angle, and as shown in an enlarged view in FIG. The lower surface of the backup material main body 56 is attached to the lower side, so that the downward rotation from the substantially horizontal or slightly upward inclined state is restricted, and the upward rotation can be freely performed. It is. The amount of protrusion of the restricting member 58 is set so that there is no problem even at the minimum eccentricity at which the clearance between the pile 1 and the sheath tube 2 is the narrowest.
Therefore, even if the gap between the pile 1 and the sheath tube 2 changes, the backup material 50A can rotate upward as shown in FIG. The contact portions 32 of 10 can be physically supported from the lower side, and the contact state of the contact portions 32 with the outer peripheral surface 1 a of the pile 1 can be maintained. In addition, after the backup material 50A is rotated upward, the downward rotation is permitted up to a predetermined horizontal angle.
Also by the grout seal structure 100 using such a backup material 50A, the same effect as that of the embodiment already described is obtained.
Further, according to the backup material 50A, the same effect as the chain-like backup member 50 in which the link member 51 is connected by the connection pin 52 can be obtained, and the structure can be simplified.

In the above embodiment, the backup material main body 56 of the backup material 50A is made of steel or synthetic resin material such as a round bar, attached to the mounting bracket 57 by the pivot shaft 59 so as to be rotatable. Only rotation is permitted, and downward rotation is restricted. However, the backup material main body 56 is formed of one having a repulsive force against bending such as a spring material, and the pile 1 and the sheath tube are formed by the repulsive force. It is possible to allow the change of the space between 2 and 3 and physically support the contact portion 32 of the grout seal material 10 from the lower side. The backup material main body 56 in this case is not limited to a round steel having a repulsive force, but may have another cross-sectional shape, and is not limited to a metal material and is made of a synthetic resin material having a repulsive force. It can also be done.
By using the backup material 50A having such a repulsive force, not only physical support but also repulsive force can be applied when supporting the contact portion 32 of the grout seal material 10, and the contact portion can be more reliably 32 sealing states can be secured.
Also by the seal structure 100 of grout material using the backup material 50A having such a repulsive force, the same effect as the embodiment already described is exhibited.
Further, in the above embodiment, the mounting bracket 57 for mounting the backup material 50A is welded to the base ring 21 or welded to the sheath pipe 2. However, with the guide plate 3 for adjusting the clearance between the mounting bracket 57 and Alternatively, the backup member 50A may be attached to the guide plate 3 or the mounting bracket 57 may be attached to the guide plate 3.

According to the seal structure 100 for grout material of the present invention, as described in detail with the embodiment above, according to the seal structure 100 for grout material of the present invention, the grout material to be filled between the pile 1 and the sheath pipe 2 extrapolated to the pile 1 is sealed Is a seal structure of grout material for fixing and integrating the pile 1 and the sheath tube 2 with the grout material, and the fixing portion 20 attached to the inner peripheral surface 2 a of the sheath tube 2 and extending to the fixing portion 20 And a grout seal material of an elastic body having a contact portion 32 which is inserted into and attached to the outer peripheral surface 1a of the pile 1 and contacts and seals the outer peripheral surface 1a of the pile 1 by elastic deformation and supports the grout material 10, and a plurality of radially disposed lower portions than the fixed portion 20, the base end portion is attached to the inner peripheral surface of the sheath pipe 2 at a predetermined angle, and upward rotation is permitted, and the pile 1 and the sheath pipe variations in the Joint Gap between 2 allows, the downward rotation of the predetermined angle Because braking has been tip provided backup material 50 which enables support the load of the grout to hold the contact state of the contact portion 32 on the lower side of the contact portion 32, the Joint Gap between pile 1 and the sheath pipe 2 Even if it is large, the attachment of the grout seal material 10 to the pile 1 becomes easy without causing damage, and it is not necessary to divide the necessary grout material twice separately regardless of the size of the play space.
That is, in the grout seal structure 100, the supporting force of the backup material 50 physically supported from the lower side of the contact portion 32 in addition to the frictional force of the contact portion 32 due to the inner diameter of the opening 31 of the grout seal material 10. The load of grout can be supported. As a result, even if the play space between the pile 1 and the sheath pipe 2 is large, it is less necessary to reduce the inner diameter of the opening 31 of the grout seal material 10 and support the load of the grout material only by the friction force. It is possible to insert into the pile 1 without causing an increase in the insertion load, and to prevent damage at the time of installation.
Further, according to the seal structure 100 of the grout material, even if the filling height of the grout material on the grout seal material 10 on the free space between the pile 1 and the sheath pipe 2 is increased, the contact portion 32 of the grout seal material 10 The load of the grout material can be supported by the friction force of the support and the supporting force by the backup material 50, and there is no need to twice drive the grout material to be filled regardless of the size of the play space, it is necessary to once. It can be placed and filled to a high grout height.

Further, according to the seal structure 100 of grout material, the grout seal material 10 has a thickness that suppresses the elongation in the circumferential direction to a predetermined amount by the load of the grout material in a state where the contact portion 32 is supported by the backup material 50. Since the slip is formed so as to suppress the slip at the contact portion 32, the slip of the contact portion 32 between the plurality of radial backup members 50 is prevented by the thickness of the grout seal member 10 which suppresses the elongation. As well as sealing the grout material reliably, the load of the grout material can be supported.

Further, according to the seal structure 100 of grout material, the backup material 50 has the tip portion provided along the lower surface of the grout seal material 10 so that the backup material 50 can be made along the outside of the lower surface of the grout seal material 10 or By being embedded along the bottom surface of the grout seal 10, the tip end can be reliably positioned below the contact portion 32 of the grout seal material 10, and the contact portion 32 can be physically supported. In addition, the grout seal portion 30 can be supported by the portion of the backup material 50 along the grout seal material 10 to support the load of the grout material.

  Moreover, according to the seal structure 100 of grout material, the grout seal material 10 is attached via the base ring 21 in which the fixing portion 20 is welded to the sheath pipe 2, and the backup material 50 is fixed to the base ring 21 at the base end. By attaching the grout seal material 10 and the backup material 50 to the base ring 21 by attaching them at a predetermined angle, the grout seal material 10 can be attached directly to the sheath pipe 2 via the base ring 21. As compared with the case where the backup material 50 is attached, the attachment can be easily performed, and the work in the field can be reduced.

According to the backup material 50 for grout seal material of the present invention, the grout material filled in the gap between the pile 1 and the sheath pipe 2 extrapolated to the pile 1 is sealed to grout the pile 1 and the sheath pipe 2 a backup material 50 for grout seal 10 of the elastic body for supporting the grout to secure integrated by wood, the inner peripheral surface is more than disposed of the sheath tube 2 below the grout seal 10 The base end is attached at a predetermined angle, and the upward rotation is permitted, and the fluctuation between the play of the pile 1 and the sheath tube 2 is permitted , and the tip at which the downward rotation is restricted from the predetermined angle is Since the load of the grout material can be supported by holding the contact state of the contact portion 32 on the lower side of the contact portion 32 in contact with the outer peripheral surface 1a of the pile 1, the gap between the pile 1 and the sheath tube 2 is large Also, installation of the grout seal material 10 into the pile 1 is facilitated without causing damage. And there is no need to perform the filling of the required grout regardless of the size of the Joint Gap divided into twice.
That is, in the backup material 50 for the grout seal material, the support of the backup material 50 physically supported from the lower side of the contact portion 32 in addition to the frictional force of the contact portion 32 due to the inner diameter of the opening 31 of the grout seal material 10 The force can support the grout load.
As a result, even if the play space between the pile 1 and the sheath pipe 2 is large, it is less necessary to reduce the inner diameter of the opening 31 of the grout seal material 10 and support the load of the grout material only by the friction force. It is possible to insert into the pile 1 without causing an increase in the insertion load, and to prevent damage at the time of installation.
Further, according to the backup material 50 for the grout seal material, even when the filling height of the grout material on the grout seal material 10 between the free space of the pile 1 and the sheath pipe 2 is increased, the contact of the grout seal material 10 The load of the grout material can be supported by the frictional force of the portion 32 and the supporting force by the backup material 50, and there is no need to twice drive the grout material to be filled regardless of the size of the play, once It can be placed and filled to the height of the grout material required for the

  Further, according to the backup material 50 for grout seal material, the backup material 50 is fixed at the base end portion to the inner peripheral surface 2a of the sheath tube 2 at a predetermined angle, and is a connection pin around the horizontal axis toward the tip end portion. The plurality of link members 51 connected at 52 are provided, and the connecting portion of each link member 51 is provided with a restricting member 54 which is permitted to rotate upward and restricts downward rotation from a predetermined angle, Even if the play interval between the pile 1 and the sheath tube 2 changes, it is possible to physically support the contact portion 32 of the grout seal material 10 by following it.

  In addition, according to the backup material 50A for grout seal material, the backup material 50A can be formed of a spring material whose base end portion is fixed at a predetermined angle, and can support the contact portion 32 while allowing variation in play due to elastic deformation. Therefore, even if the gap between the pile 1 and the sheath tube 2 changes, it can follow by elastic deformation, and the contact portion 32 of the grout seal material 10 is physically supported by the repulsive force of the spring. Can.

In the above embodiment, although the backup material is arranged radially, the arrangement direction is not limited to the radial direction as long as the contact portion of the grout seal material can be supported from the lower side. Directional backup materials can be combined and supported, for example, can also be arranged in a parallel-girder configuration.
In the above embodiment, the grout seal structure and the grout seal material 10 supported by the backup material have been described by way of example, but the present invention is not limited to the above embodiment, and a pile and a sheath are described. The shape and the like are not limited at all as long as they can seal the grout material between the tube and the tube.

DESCRIPTION OF SYMBOLS 1 pile 1a outer peripheral surface 2 sheath pipe 2a inner peripheral surface 3 guide plate 10 grout seal material 20 fixing | fixed part 21 base ring 30 grout seal part 31 opening part 32 contact part 50 backup material 51 link member 51a link member 52 most proximal end Connecting pin 53 Fixing bracket 54 Regulating member 50A Backup material 56 Backup material main body 57 Mounting bracket 58 Regulating member 59 Rotating shaft 100 Grout seal structure

Claims (7)

A grout material seal structure for sealing a grout material filled in a gap between a pile and a sheath pipe externally fitted to the pile and fixing and integrating the pile and the sheath pipe with the grout material. ,
A fixing portion attached to an inner circumferential surface of the sheath pipe;
A grout seal portion having a contact portion extended to the fixed portion and attached to the outer peripheral surface of the pile and coming into contact with the outer peripheral surface of the pile to seal by elastic deformation, thereby supporting the grout material Make up grout seal material,
The base end is attached to the inner circumferential surface of the sheath at a predetermined angle and is allowed to rotate upward, so that the fluctuation between the play of the pile and the sheath is small. A back-up material which allows the load of the grout material to be supported by allowing the tip end of which downward rotation is restricted from the predetermined angle to hold the contact state of the contact portion on the lower side of the contact portion Provided
Grout material seal structure characterized by The grout seal material is formed in a thickness that suppresses the elongation in the circumferential direction to a predetermined amount by the load of the grout material in a state where the contact portion is supported by the backup material, and the slip at the contact portion is suppressed Do,
The sealing structure of the grout material according to claim 1 characterized by things. The tip end of the backup material is provided along the lower surface of the grout seal material.
The sealing structure of the grout material according to claim 1 or 2 characterized by things. The grout seal material is attached via a base ring on which the fixing portion is welded to the sheath pipe,
The backup material is attached to the base ring at a base end at a predetermined angle.
The sealing structure of the grout material according to any one of claims 1 to 3 characterized by things. An elastic body for supporting the grout material for sealing a grout material filled in a gap between a pile and a sheath pipe externally fitted to the pile and fixing and integrating the pile and the sheath pipe with the grout material Backup material for grout sealing material,
A plurality of members are disposed below the grout seal material, and the base end portion is attached to the inner peripheral surface of the sheath at a predetermined angle to allow upward rotation, so that the variation between the play of the pile and the sheath Of the grout material by holding the contact state of the contact portion on the lower side of the contact portion where the tip end whose rotation downward from the predetermined angle is restricted contacts the outer peripheral surface of the pile Configured to be supportable,
Backup material for grout seal material characterized by The backup material includes a plurality of link members, the proximal end portion of which is fixed to the inner peripheral surface of the sheath at a predetermined angle, and which are connected by connection pins around a horizontal axis toward the distal end portion. The connecting portion of the member is provided with a restricting member which is permitted to rotate upward and restricts downward rotation from the predetermined angle,
The backup material for grout seal material according to claim 5, characterized in that. The backup material is formed of a spring material in which the base end portion is fixed at a predetermined angle, and is configured to be able to support the contact portion while allowing variation in play due to elastic deformation.
The backup material for the grout seal material according to claim 5 or 6 characterized by things.

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