JP2016199926A - Grout seal material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grout seal material, which can be used in a large joint gap, easily installed on a pile and easily manufactured due to a simplified structure.SOLUTION: A grout seal material 10 is made of an elastic raw material, and is disposed between a pile 1 and a sheath pipe 2 disposed outside the pile 1 and seals a charged grout material to fix the pile 1 and the sheath pipe 2 by the grout material. The grout seal material comprises: a fixing part 20, which is installed on an inner peripheral surface 2a of the sheath pipe 2; and a grout seal part 30, which is connected with the fixing part 20 and installed on an outer peripheral surface 1a of the pile 1 to seal by contacting to the outer peripheral surface 1a of the pile 1 due to elastic deformation and support the grout material. An opening 31 with smaller diameter by predetermined amount than the pile 1 is formed on the grout seal part 30. An angle θ between the fixing part 20 and the opening 31 is set so as to ensure a seal contacting width to support a grout load from a lower edge of the opening part 31 on the largest eccentric side where central axes of the sheath pipe 2 and the pile 1 are most widely separated.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a grout seal material.

  There is a jacket construction method in which a sheath pipe on the structure side is extrapolated to a pile driven into the ground, and a grout material is filled between the pile and the sheath pipe to solidify and fixed. A seal material is attached to prevent the grout material from flowing out.

As a grout seal material for sealing between a pile and a sheath tube, for example, there is a grout seal material disclosed in Patent Document 1. This grout seal material is a material having elasticity, and a cross-sectional shape is L-shaped with a short cylindrical fixing portion attached to the inner peripheral surface of the sheath tube and a sealing portion projecting horizontally at the lower end edge of the fixing portion. Is formed.
In addition, the grout seal material disclosed in Patent Document 2 is a material having elasticity, and includes a cylindrical fixed base that is attached to the inner peripheral surface of the sheath tube, and a seal portion that is tapered from the upper edge of the fixed base. Is extended obliquely upward in the center direction to form an opening having a smaller diameter than the pile, and a comb-like reinforcing cord is inserted from the fixed base to the seal portion.

In the jacket method, existing piles may be reused in addition to using new piles. When reusing existing piles, the piles may tilt when removing the sheath tube on the structure side.
When trying to extrapolate a sheath pipe to an inclined pile, it is necessary to increase the inner diameter of the sheath pipe, increasing the clearance between the pile and the sheath pipe, and increasing the eccentricity between the pile and the sheath pipe. A grout seal that can seal the gap is required.

Japanese Patent Laying-Open No. 2005-307583 JP-A-8-41922

In the grout seal material of Patent Document 1, the opening portion contacts the outer peripheral surface of the pile, and the friction between the opening portion and the pile and the fixed portion bear the weight of the grout material such as mortar.
Moreover, when it is eccentric to one side, the friction is increased when the clearance is narrow, but the friction is decreased when the clearance is large.
For this reason, there is a problem that the grout material may leak if the friction is small.
Also, in order to be able to cope with a large gap, the inner diameter of the opening that contacts the outer peripheral surface of the pile must be reduced, the load for insertion into the pile increases, and the inner diameter of the opening increases. In some cases, the grout seal material may break.
Even in the grout seal material of Patent Document 2, in order to be able to cope with a large gap, the inner diameter of the opening contacting the outer peripheral surface of the pile has to be reduced, which is somewhat smaller than the grout seal material described above. Although there is a margin, the load for insertion into the pile increases, and depending on the size of the inner diameter of the opening, there may be a problem that the grout seal material breaks.
Further, the grout seal material of Patent Document 2 has a problem that the structure is complicated because the thickness of the seal portion is tapered and the interdigital reinforcing cord is inserted into the fixed base portion.
Furthermore, it is necessary to prepare a dedicated die every time the diameters of the pile and the sheath tube are changed, and further, there is a problem that a process for inserting the reinforcing cord is also required, and it cannot be easily manufactured.

  The present invention has been made in view of the above-mentioned problems of the prior art, and provides a grout seal material that can cope with a large gap, can be easily inserted into a pile, has a simplified structure, and is easy to manufacture. With the goal.

In order to achieve the above object, the grout seal material according to the present invention is:
It is formed of a material having elasticity, is interposed between a pile and a sheath pipe extrapolated to the pile, seals the grout material to be filled, and fixes the pile and the sheath pipe with the grout material. Grout sealing material for
A fixing portion attached to the inner peripheral surface of the sheath tube;
A grout seal portion connected to the fixed portion and inserted into the outer peripheral surface of the pile to contact and seal the outer peripheral surface of the pile by elastic deformation; and a grout seal portion for supporting the grout material,
The grout seal part is formed with an opening having a smaller diameter than the pile, and the angle from the fixed part to the opening is the maximum eccentric side at which the central axis of the sheath tube and the pile is most separated. The seal contact width of the contact portion that supports the grout load from the lower end edge of the opening is set to be able to be secured, and configured.
It is characterized by that.

  The grout seal part may be formed to have a uniform thickness.

  The grout seal portion may have an angle of 60 to 75 degrees with respect to the horizontal direction.

  The grout seal portion may be formed so that the thickness of the contact portion that contacts the pile is smaller than the thickness of the other grout seal portion, and the thickness of the end portion of the opening is different from that of the other grout seal portion. You may form thicker than a seal part.

  The grout seal portion may be formed in a substantially truncated cone shape or a bell mouth shape.

  The fixing portion of the grout seal material may be attached to a base ring welded to the sheath pipe or attached via a stud bolt implanted in the sheath pipe.

A taper-shaped cap may be inserted into the tip of the pile on which the grout seal material is interposed.
The large gap is the largest gap so far. For example, if the outer diameter of the pile is 1000 mm, the inner diameter of the sheath tube is about 1200 mm, but the larger gap here is more than the above example For example, if the outer diameter of the pile is 800 mm, the inner diameter of the sheath tube is about 1300 mm.

  According to the present invention, it is possible to cope with a large gap, and it can be easily inserted into a pile, the structure can be simplified, and manufacture can be facilitated.

It is a longitudinal cross-sectional view, respectively, before assembly and after assembly insertion according to an embodiment of the grout seal material of the present invention. It is a partial expanded longitudinal section concerning one embodiment of the grout seal material of the present invention. It is a partial expanded longitudinal cross-sectional view concerning other one Embodiment of the grout sealing material of this invention. It is a partial expanded longitudinal cross-sectional view shown compared with the prior art example concerning one embodiment of the grout sealing material of this invention.

Hereinafter, embodiments of the grout seal material of the present invention will be described in detail with reference to the drawings.
A grout seal material 10 of the present invention is formed of an elastic material such as synthetic rubber or natural rubber as shown in FIG. 1, for example, and is interposed between a pile 1 and a sheath tube 2 extrapolated to the pile 1. It is for sealing the grout material with which it is equipped and filling and fixing the pile 1 and the sheath pipe 2 with a grout material.
The grout seal member 10 is connected to the inner peripheral surface 2a of the sheath tube 2 and the fixed portion 20, and is connected to the outer peripheral surface 1a of the pile 1 and is brought into contact with the outer peripheral surface 1a of the pile 1 by elastic deformation. And a grout seal portion 30 that supports the grout material to be filled.
The grout seal portion 30 has an opening 31 having a smaller diameter than the pile 1 at the upper edge. In addition, the grout seal portion 30 sets the angle θ from the fixed portion 20 to the opening portion 31 and applies the grout load from the lower end edge of the opening portion 31 at the maximum eccentric side Ca where the central axes of the sheath tube 2 and the pile 1 are farthest apart. The seal contact width Ba of the seal contact portion 32 constituting the contact portion that can be supported is set so as to be secured.
The grout seal portion 30 is formed in a substantially truncated cone shape in combination with a bell mouth shape or a plurality of truncated cone shapes having different angles.

The fixing portion 20 is a portion located at the lower end portion of the grout seal portion 30 having a substantially frustoconical shape, for example, and is a portion attached to the inner peripheral surface of the sheath tube 2. The fixing portion 20 is formed in a cylindrical shape having an outer diameter that matches the inner diameter of the sheath tube 2 to be mounted. For example, as shown in FIGS. 1 and 2, the fixing portion 20 is attached to the inner peripheral surface of a metal annular base ring 21 that can be welded to the sheath tube 2 by vulcanization adhesion or the like. The fixing portion 20 can be attached by welding the base ring 21 to the inner peripheral surface 2a of the sheath tube 2 all around.
In addition, as shown in FIG. 3, the fixing part 20 is attached to the inner peripheral surface 2a of the sheath tube 2 by implanting a stud bolt 2b in the sheath pipe 2 and forming the bolt hole in advance. It may be attached to 2b and tightened with a nut 2d via a presser plate 2c.

The grout seal part 30 is provided with an opening 31 having a small diameter by a predetermined amount with respect to the outer diameter of the pile 1 at the upper end edge. The grout seal portion 30 is connected to the fixed portion 20 at the lower end portion of the grout seal material 10, and the vertical cross-sectional shape from the fixed portion 20 to the opening portion 31 at the upper end edge is constituted by, for example, a substantially frustoconical conical surface.
The diameter of the opening 31 of the grout seal portion 30 is set to a predetermined small diameter based on the outer diameter of the pile 1 regardless of the clearance (clearance) between the pile 1 to which the grout seal material 10 is attached and the sheath tube 2. It is. Thereby, it is set as the magnitude | size which can be inserted in the pile 1 without generating damage, such as a cutting | disconnection, by elastically deforming the opening part 31. FIG.
In the state where the opening 31 is elastically deformed and inserted into the outer peripheral surface 1a of the pile 1, the grout seal portion 30 is elastically deformed downward from the opening 31 by the elastic deformation as shown in FIG. A seal contact portion 32 constituting a contact portion that contacts the surface 1a is formed.

As shown in FIG. 1 and FIG. 2, the seal contact width of the seal contact portion 32 varies depending on the amount of eccentricity between the center axis of the pile 1 and the center axis of the sheath tube 2, and the seal contact width Ba at the maximum eccentric side Ca. Is the narrowest, the smallest eccentric side Cb has the largest seal eccentric width Bb, and the neutral state Cc has an intermediate seal contact width Bc.
Therefore, in this grout seal material 10, the seal contact width Ba of the grout seal portion 30 at the maximum eccentric side Ca may be ensured so as to support and seal the grout material to be filled.

Therefore, in this grout seal material 10, the angle θ of the grout seal portion 30 is set to be large with respect to the horizontal direction, and the integral opening 31 connected to the upper edge of the grout seal portion 30 is located outside the pile 1. Even if it is the magnitude | size made into the predetermined amount small diameter with respect to a diameter, it can insert now in the pile 1 without trouble.
Further, in this grout seal material 10, the length along the inclined surface of the grout seal portion 30 (for example, the length of the frustoconical busbar) is set by setting the angle θ of the grout seal portion 30 large with respect to the horizontal direction. The seal contact width Ba for supporting the grout load at the seal contact portion 32 from the lower end edge of the opening 31 on the maximum eccentric side Ca where the center axis of the sheath tube 2 and the pile 1 is the farthest apart is increased. Only have secured.
In this grout seal material 10, the angle θ of the grout seal portion 30 from the fixed portion 20 to the opening 31 is in the range of 60 degrees to 75 degrees, preferably 70 degrees. When the angle θ of the grout seal portion 30 is smaller than 60 degrees, the length of the bus bar of the grout seal portion 30 is shortened, so that it is difficult to secure the deformation allowance of the opening portion 31 or to secure the seal contact width Ba.
Further, if the angle θ of the grout seal portion 30 is larger than 75 degrees, the amount of material used is increased, and the seal contact width Ba is wasted longer than necessary.
In such a grout seal material 10, the thicknesses of the fixed portion 20 and the grout seal portion 30 are uniform.
By doing so, the grout seal portion 30 is filled with a grout material as shown in FIG. 4, unlike the conventional grout seal material X of Patent Document 1 and the grout seal material Y of Patent Document 2. The seal contact width Ba of the seal contact portion 32 is ensured also on the maximum eccentric side Ca while allowing the deflection due to the above.
In addition, in the grout seal material Y of Patent Document 2, the rigidity of the pinned reinforcing cord and the seal portion extending obliquely upward is increased by increasing the thickness toward the fixed base side to increase the load of the grout material. At the time of maximum eccentricity, only the thin seal part at the tip is in contact with the pile, the length of the grout seal part 30 of the present application is secured, and the load of the grout material is determined by the friction force and the pressure by the grout material. It is different from the idea that it can be supported and the opening 31 can be smoothly mounted.
Further, when the inner diameters of the grout seal material 10 and the opening 31 of the present application are the same, as shown in FIG. 4, the seal contact portion on the maximum eccentric side Ca is the grout seal material X, Y. It cannot be ensured, and it is in a state in which the load of the grout material to be filled cannot be supported or sealed, and the inner diameter of the opening must be further reduced.
In addition, the wall thickness of the edge part of the opening part 31 of the grout sealing material 10 can also be made thicker than another part, and the clamping force to the pile 1 can be increased by carrying out like this.

The grout seal material 10 is manufactured, for example, as follows.
A rubber sheet material having a uniform thickness is produced using synthetic rubber or natural rubber.
The rubber sheet material having a uniform thickness is manufactured using a manufacturing facility equipped with a mold or a mandrel corresponding to the thickness.
The rubber sheet material is cut into a predetermined size and bonded by vulcanization bonding or the like, whereby the grout seal material 10 including the fixed portion 20 and the grout seal portion 30 is manufactured.

In the sealing of the grout material by the grout seal material 10 configured as described above, first, the fixing portion 20 is attached to the inner peripheral surface of the base ring 21 by vulcanization adhesion or the like.
And the base ring 21 which adhere | attached the fixing | fixed part 20 is attached by carrying out the perimeter welding to the inner peripheral surface of the sheath pipe 2, and the space | interval between the sheath pipe 2 and the fixing | fixed part 20 is made into a sealing state.
Next, the grout seal material 10 together with the sheath tube 2 is inserted into the pile 1. When the grout seal material 10 is inserted into the pile 1, the opening 31 of the grout seal portion 30 is placed on the pile 1, and the opening 31 is elastically deformed and pushed out.
In addition, you may make it attach the cap which the front-end | tip squeezed to the front-end | tip part of the pile 1 before insertion to the pile 1 of this grout sealing material 10. FIG. By doing so, the grout sealing material 10 can be prevented from being caught or torn even if there is a burr or the like at the tip of the pile 1 and can be smoothly mounted.
When inserted into the pile 1, the angle θ with respect to the horizontal direction of the grout seal portion 30 is as large as about 70 degrees, so that the opening 31 can be easily expanded and inserted as shown in FIG. It can be inserted elastically deformed without increasing the load.
In this way, the sheath tube 2 is inserted to a predetermined position of the pile 1.
Then, for example, if the amount of eccentricity between the sheath tube 2 and the pile 1 is a neutral state Cc of 0, the seal contact width Bc can be secured as the seal contact portion 32 (see FIG. 1B).
Thus, after inserting the grout seal material 10 between the pile 1 and the sheath tube 2, the grout material is filled, and the grout material is filled with the frictional force of the seal contact portion 32 and the pressure of the grout material applied to the grout seal portion 30. The sheath tube 2 is fixed to the pile 1 by solidifying the grout material.
As shown in FIG. 2, the seal contact width Ba can be secured as the seal contact portion 32 on the maximum eccentric side Ca where the gap between the sheath tube 2 and the pile 1 is widened with the grout seal material 10 attached. The seal contact width Bb can be secured as the seal contact portion 32 on the opposite minimum eccentric side Cb.
Therefore, in this grout seal material 10, it is possible to ensure the support of the grout material and the sealing state of the grout material in the allowable eccentric width from the maximum eccentric side Ca to the minimum eccentric side Cb.
In particular, the sealing contact width of the seal contact portion 32 is secured and sealed without causing an increase in insertion load to the pile 1 even when the clearance between the pile 1 and the sheath tube 2 is large compared to the past. Can do.
Moreover, in this grout sealing material 10, the seal contact part 32 and the pile 1 contact, and the grout material can be supported by the frictional force of the seal contact part 32 and the pile 1 and the fixed part 20.
On the other hand, even when eccentric, the grout seal material 10 follows regardless of the gap, and when the grout material is filled, the grout seal 30 and the seal contact portion 32 are subjected to the pressure of the grout material on the surface, and the pile 1 Since the frictional force is increased, it is possible to prevent the grout material from leaking even if eccentric.

  According to such a grout seal material 10, the grout seal portion 30 having a uniform thickness is obliquely upward in the central direction from the upper end edge of the fixed portion 20 attached to the inner peripheral surface of the sheath tube 2 with respect to the horizontal direction. The angle θ is extended within a range of 65 to 75 degrees, and the opening 31 at the upper edge of the grout seal portion 30 is formed to have a predetermined diameter smaller than the outer diameter of the pile 1, so that the seal contact portion 32 is sufficiently secured. Can do. Moreover, since the grout seal part 30 is connecting the fixed part 20 and the seal contact part 32 in a curved surface, the contact pressure between the seal contact part 32 and the outer peripheral surface 1a of the pile 1 does not decrease, and the pile 1 and the sheath pipe Even when there is a large gap between the two, it can be used for sealing a grout material.

As explained in detail with the above embodiment, according to the grout seal material 10 of the present invention, it is formed of an elastic material, and is interposed between the pile 1 and the sheath tube 2 extrapolated to the pile 1. A grout seal material 10 for sealing the grout material to be filled and fixing the pile 1 and the sheath tube 2 with the grout material, and a fixing portion 20 attached to the inner peripheral surface 2a of the sheath tube 2; A grout seal portion 30 connected to the fixed portion 20 and inserted into the outer peripheral surface 1a of the pile 1 to contact and seal the outer peripheral surface 1a of the pile 1 by elastic deformation, and to support the grout material. The portion 30 is formed with an opening 31 having a predetermined smaller diameter than the pile 1, and an angle θ from the fixed portion 20 to the opening 31 is set to the maximum eccentric side Ca where the central axis of the sheath tube 2 and the pile 1 is most separated. Grout from the lower edge of the opening 31 Since the seal contact width Ba of the contact portion 32 that supports the weight is set so as to be secured, the inner diameter of the opening 31 of the grout seal portion 30 can be increased even when the clearance between the pile 1 and the sheath tube 2 is large. Since it is not necessary to secure the sealing contact portion 32 by reducing the size, the insertion load to the pile 1 does not increase, the insertion load can be reduced, and the occurrence of damage to the opening 31 during insertion into the pile 1 is suppressed. be able to. Further, the seal contact portion 32 can be sufficiently secured. Furthermore, since the grout seal part 30 connects the fixed part 20 and the seal contact part 32 in a curved surface, there is no decrease in the contact pressure between the seal contact part 32 and the pile outer peripheral surface, and the pile 1 and the sheath pipe 2 Even if there is a large gap, it can be used for sealing grout materials.
Moreover, in this grout sealing material 10, the seal contact part 32 and the pile 1 contact, and the grout material can be supported by the frictional force of the seal contact part 32 and the pile 1 and the fixed part 20.
On the other hand, even when eccentric, the grout seal material 10 follows regardless of the gap, and when the grout material is filled, the grout seal 30 and the seal contact portion 32 are subjected to the pressure of the grout material on the surface, and the pile 1 Since the frictional force is increased, it is possible to prevent the grout material from leaking even if eccentric.

  Further, in the grout seal material 10, by forming the grout seal portion 30 with a uniform thickness, it is possible to easily manufacture grout seal materials of different sizes using a rubber sheet having a predetermined thickness. Can be manufactured easily without the need for special equipment with different wall thickness or reinforcement each time the outer diameter of the pile 1 is different. In addition, there is no process such as filling with a reinforcing material, and the process can be reduced.

  Further, in the grout seal material 10, since the angle θ of the grout seal portion 30 is set to an angle of 60 to 75 degrees with respect to the horizontal direction, the elastic deformation allowance of the opening portion 31 is reduced without reducing the inner diameter of the opening portion 31. It can be ensured and can be used as a sealing material when the gap is large without causing an increase in insertion load to the pile 1.

  Further, in the grout seal material 10, the thickness of the seal contact portion 32 as a contact portion that contacts the pile 1 of the grout seal portion 30 is formed to be smaller than that of the other grout seal portions 30. The opening 31 can be easily inserted.

  Further, in the grout seal material 10, the thickness of the end portion of the opening 31 that contacts the pile 1 of the grout seal portion 30 is formed to be thicker than the other grout seal portions 30, so that the opening to the pile 1 is further increased. The tightening force of the portion 31 can be increased to improve the sealing performance.

  Further, in the grout seal material 10, the necessary seal contact width of the seal contact portion 32 can be ensured by forming the grout seal portion 30 in a substantially truncated cone shape or bell mouth shape.

  Further, in the grout seal material 10, the fixing portion 20 is attached to the base ring 21 welded to the sheath tube 2 or attached via the stud bolt 2 b implanted in the sheath tube 2, and the inner peripheral surface 2 a of the sheath tube 2. It can be easily installed and can be installed easily.

  Moreover, in the grout sealing material 10, by inserting a taper-shaped cap in the front-end | tip part of the said pile 1, even if there exists a burr | flash etc. in the front-end | tip part of the pile 1, the grout sealing material 10 may be caught or torn. Can be installed smoothly.

  In the above embodiment, explanation of the grout material is omitted, but a grout material that is usually used can be used, and any of synthetic resins such as cement (mortar), glass, and urethane can be used. There may be.

DESCRIPTION OF SYMBOLS 1 Pile 1a Outer peripheral surface 2 Sheath pipe 2a Inner peripheral surface 2b Stud bolt 2c Holding plate 2d Nut 2e Guide plate 10 Grout seal material 20 Fixed part 21 Base ring 30 Grout seal part 31 Opening part 32 Seal contact part (contact part)
Ba Maximum Eccentric Side Seal Contact Width Bb Minimum Eccentric Side Seal Contact Width Bc Neutral State Seal Contact Width Ca Maximum Eccentric Side Cb Minimum Eccentric Side Cc Neutral State θ Angle X of Grout Seal Part with Horizontal Direction Conventional Grout Seal Material Y Conventional grout seal material

Claims (8)

It is formed of a material having elasticity, is interposed between a pile and a sheath pipe extrapolated to the pile, seals the grout material to be filled, and fixes the pile and the sheath pipe with the grout material. Grout sealing material for
A fixing portion attached to the inner peripheral surface of the sheath tube;
A grout seal portion connected to the fixed portion and inserted into the outer peripheral surface of the pile to contact and seal the outer peripheral surface of the pile by elastic deformation; and a grout seal portion for supporting the grout material,
The grout seal part is formed with an opening having a smaller diameter than the pile, and the angle from the fixed part to the opening is the maximum eccentric side at which the central axis of the sheath tube and the pile is most separated. The seal contact width of the contact portion that supports the grout load from the lower end edge of the opening is set to be able to be secured, and configured.
Grout sealing material. The grout seal part is formed with a uniform thickness,
The grout seal material according to claim 1, wherein: The grout seal portion has an angle of 60 to 75 degrees with respect to the horizontal direction.
The grout seal material according to claim 1 or 2, wherein The grout seal part is formed to have a thickness smaller than the other grout seal part, with the thickness of the contact part contacting the pile.
The grout seal material according to claim 1 or 3, wherein The grout seal part is formed with a thickness greater than the other grout seal part at the end of the opening.
The grout seal material according to claim 1 or 3, wherein The grout seal part is formed in a substantially truncated cone shape or bell mouth shape,
The grout seal material according to any one of claims 1 to 5, wherein: The fixed part of the grout seal material is attached to a base ring welded to the sheath pipe or attached via a stud bolt that is implanted in the sheath pipe.
The grout seal material according to any one of claims 1 to 6, wherein A taper-shaped cap is inserted into the tip of the pile in which the grout seal material is interposed,
The grout seal material according to any one of claims 1 to 7, wherein

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