JP2013227757A - Packer for injecting mortar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packer for injecting mortar, in which an inflation part is inflated by applying pressure thereto in a compression direction, capable of easily and efficiently inflating the inflation part.SOLUTION: The packer for injecting mortar comprises: a cylindrical injection shaft 3; rubber holders 4 and 5 installed around a front end outer periphery and a rear end outer periphery of the injection shaft respectively to move freely in a longer direction of the injection shaft; a plurality of inflation parts 6 which are installed around the periphery of the injection shaft between the rubber holders to move freely in a longer direction of the injection shaft, and are inflated to an outer peripheral direction by applying compression pressure thereto; a packer part 2 including a lock nut 8 coupled to the front end of the injection shaft; and a cylinder part 11 disposed on the base end of the packer part. The cylinder part comprises: a sealed cylinder body 12; a rod 16 penetrating the cylinder body and being coupled to the injection shaft in the front side; and a piston 19 installed around the rod in the cylinder body. In the cylinder part, there is formed a channel whose front end is open in the cylinder body and base end is open to the outside as well as a receiving space 27 adjacent to the front surface of the piston so as to receive actuation liquid.

Description

  The present invention is inserted into a borehole or the like formed in the ground, and after forming an enclosed space in the borehole or the like by inflating the expanding portion, mortar or the like is inserted into the ground through the enclosed space. More particularly, the present invention relates to a mortar injection packer characterized in that the expansion portion can be easily expanded.

  Conventionally, in the case of dam construction, tunnel excavation, construction of huge structures, etc., in order to strengthen the ground, a borehole is formed in the ground, and a steel pipe is inserted into the borehole as appropriate. A chemical solution such as mortar is pressed into and around a borehole or a steel pipe, and a mortar injection packer is used as an apparatus for that purpose.

  This mortar injection packer will be explained. Generally, a mortar injection packer for ground improvement has a hollow rod through which a chemical solution can pass, and an optional part of this rod is made of rubber. An inflatable portion is provided around the inflatable portion, and the inflatable portion can be inflated toward the outer periphery of the rod.

  Then, the mortar injection packer is inserted into a borehole or a steel pipe inserted into the borehole, and the expanded portion is expanded in this state, thereby forming a closed space below the expanded portion. Therefore, it is possible to improve the ground by injecting chemicals such as mortar into the borehole through the rod.

  By the way, there are various methods for expanding the expansion part in the mortar injection packer. For example, there is a method of expanding the expansion part with air. In this method, it is necessary to form an air flow path in the rod. For this reason, when the rod becomes long, the air flow path needs to be lengthened, which increases the cost.

  Therefore, in order to reduce the cost, there is one that employs a method of expanding by applying pressure in the compression direction to the expanding portion. That is, FIG. 5 is a schematic partial cross-sectional view along the longitudinal direction showing the structure of this mortar injection packer, in which 41 is a mortar injection packer (hereinafter referred to as “conventional mortar injection packer”). . The conventional mortar injection packer 41 has a hollow rod 42, and a boring hole or a steel pipe (hereinafter simply referred to as “boring”) into which a chemical solution or the like is inserted through the rod 42 is inserted into the boring hole. It can be injected into the inside of the hole.)

  Further, a pair of washers 43a and 43b is provided in the vicinity of the tip of the rod (on the right side in the figure). The pair of washers 43a and 43b is fixed to the rod 42 at the tip side (right side in the figure). The base end side (left side in the figure) 43 a is slidable with respect to the rod 42. A rubber cylindrical expansion portion 44 is provided between the pair of washers 43.

  Further, the base end side (left side in the figure) of the base end side washer 43a in the rod 42 is threaded around the periphery, and the rod 42 is arranged so as to accommodate a part of the threaded portion. The guide pipe 45 is slidably provided.

  In this configuration, the handle 46 is screwed into the threaded portion of the rod 42 in the arrangement where the guide pipe 45 is placed against the end on the side opposite to the washer, and in this state, the handle 46 is tightened in the tightening direction. As it is rotated, the guide pipe 45 moves toward the distal end side of the rod 42 while being pushed by the handle 46, and the proximal washer 43a also moves toward the distal end side of the rod 42 while being pushed by the guide pipe 45. Accordingly, the expanding portion 44 is compressed toward the longitudinal direction of the rod 42.

  Then, since the distal end side washer 43b fixed to the rod 42 is located at the distal end side, the expansion portion 44 cannot move toward the distal end side and expands in the outer circumferential direction of the rod 42.

  Accordingly, by rotating the handle 46 in the tightening direction with the mortar injection packer 41 inserted into the boring hole, the expanding portion 44 expands to the outer peripheral side of the rod 42 and contacts the inner wall of the boring hole. It becomes possible to form a closed space below the inflating portion in the borehole, and in this state, the ground is improved by injecting a chemical solution such as mortar into the closed space through the inside of the rod 42. It becomes possible.

  Thus, in the conventional mortar injection packer that expands the expansion part by applying pressure in the compression direction to the expansion part, the expansion part can be expanded only by turning the handle. Unlike the mortar injection packer that expands the air, it is not necessary to provide an air flow path, and it is possible to reduce the cost, but on the other hand, it is necessary to turn the handle, so there is a problem that labor is required It can be pointed out.

  In this regard, the present inventor has previously proposed a device that applies pressure to the expansion portion by moving the rod to the proximal end side using fluid pressure, and thereby expands the pressure. Since the proximal washer forms a part of the inner wall of the rod and the washer on the proximal end is movable in the longitudinal direction of the rod, when fluid pressure is supplied to the pressure chamber, the fluid pressure is In addition, it is also added to the washer that forms a part of the inner wall of the pressure chamber, and therefore it is difficult to apply pressure only to the rod, so that the expansion portion cannot be efficiently expanded. there were.

JP 2006-28946 A

  Accordingly, the present invention provides a mortar injection packer that can easily and efficiently expand the expansion portion in a mortar injection packer that expands the expansion portion by applying pressure in the compression direction to the expansion portion. The challenge is to do.

The packer for mortar injection of the present invention is
A cylindrical injection shaft having a predetermined length;
A distal end side rubber holder and a proximal end side rubber holder, which are arranged around the distal end side outer periphery and the rear end side outer periphery of the injection shaft so as to be movable in the longitudinal direction of the injection shaft;
The injection unit disposed between the front end side rubber holder and the base end side rubber holder so as to be adjacent to each other via an intermediate rubber holder, and is arranged on the outer peripheral side of the injection shaft so as to be movable in the longitudinal direction of the injection shaft. A plurality of inflatable portions that expand in the outer circumferential direction of the injection shaft by applying a compression pressure directed in the longitudinal direction of the shaft, and restore the original shape when the compression pressure applied in the expanded state is released;
A packer portion comprising a lock nut connected to the front end side of the front end side rubber holder in the injection shaft;
A cylinder portion disposed on the base end side rubber holder side of the packer portion for applying a compression pressure in the longitudinal direction of the injection shaft to the expansion portion,
The cylinder part is
A cylinder body comprising a cylindrical cylinder tube and a cylinder head having both ends of the cylinder tube closed, and the inside of which is hermetically sealed;
A cylindrical rod that is movable in the longitudinal direction of the cylinder body while maintaining the sealed state inside the cylinder body and penetrates the cylinder body and is connected to the proximal end side of the injection shaft on the distal end side;
In the cylinder body is provided around the rod, the outer peripheral surface thereof is in close contact with the inner wall of the cylinder body, and includes a piston that moves in the cylinder body as the rod moves,
In the wall of the cylinder body, a distal end portion is opened in the cylinder body, and a base end side is formed with a flow path opened to the outside.
Forming a receiving space for receiving the fluid supplied into the cylinder body via the flow path between the front end surface of the piston and the inner wall of the cylinder body when the piston is moved to the packer part;
By supplying fluid to the inside of the cylinder body through the flow path, the injection shaft is moved to the base end side by moving the piston to the side opposite to the packer portion, and the expansion is performed through the lock nut. It is possible to apply a compression pressure to the part.

  In the mortar injection packer of the present invention, by supplying a fluid into the cylinder, the piston is moved in the cylinder, and the rod and the injection shaft to which the rod is connected are moved accordingly. By applying a compression pressure directed in the longitudinal direction, the inflatable portion can be expanded to the outer peripheral side.

  Therefore, unlike the conventional mortar injection packer in which the handle is turned to apply a compression pressure to the inflating portion, no human power is used, so that the inflating portion can be easily inflated.

  In addition, by supplying fluid into the cylinder with the inside sealed, the piston in the cylinder is moved to move the rod and the injection shaft to which the rod is connected. Can be efficiently applied to the piston, so that the expansion portion can be easily and efficiently expanded.

It is sectional drawing which shows the structure of the Example of the packer for mortar injection | pouring of this invention. It is sectional drawing which expanded and showed the structure of the vicinity of the cylinder part in FIG. It is sectional drawing for demonstrating the effect | action of the Example of the packer for mortar injection | pouring of this invention. It is sectional drawing which shows the structure of the other Example of the packer for mortar injection | pouring of this invention. It is a figure for demonstrating the conventional packer for mortar injection | pouring.

  The packer for mortar injection according to the present invention has a packer portion, and this packer portion has a cylindrical injection shaft having a predetermined length.

  A front end side rubber holder and a rear end side rubber holder are provided around the front end side outer periphery and the rear end side outer periphery of the injection shaft so as to be movable in the longitudinal direction of the injection shaft. A lock nut is connected to the shaft on the tip side with respect to the rubber holder on the tip side.

  In addition, a plurality of inflating portions are provided between the front end rubber holder and the rear end rubber holder, and each of the inflating portions applies a compression pressure in the longitudinal direction of the injection shaft to thereby apply the injection shaft. When the applied compression pressure is released, it is restored to its original shape, and is arranged adjacent to each other via an intermediate rubber holder, on the outer periphery side of the injection shaft. It is circumferentially arranged to be movable in the longitudinal direction.

  Next, the packer for mortar injection according to the present invention includes a cylinder part for applying a compression pressure directed in the longitudinal direction of the injection shaft to the expansion part of the packer part, and this cylinder part has a cylinder body. ing.

  The cylinder body includes a cylindrical cylinder tube and a cylinder head in which both ends of the cylinder tube are closed, and the inside is sealed.

  In addition, a flow path is formed in the wall of the cylinder body, and the flow path has a distal end portion opened in the cylinder body and a proximal end side opened outside.

  Furthermore, the cylinder part has a rod, and this rod is movable in the longitudinal direction of the cylinder body while penetrating the cylinder body while maintaining a sealed state inside the cylinder body. It is connected to the base end side of the injection shaft of the packer part.

  In addition, a piston is provided around the rod in the cylinder body, and the outer peripheral surface of the piston is in close contact with the inner wall of the cylinder body, and moves in the cylinder body as the rod moves. .

  Furthermore, in the cylinder body, a receiving space for receiving the fluid supplied into the cylinder body through the flow path is formed between the front end surface of the piston and the inner wall of the cylinder body when the piston is moved to the packer side. ing.

  And by such a structure, by supplying a fluid into the cylinder body through the flow path and moving the piston to the anti-packer part side, the rod is moved to the proximal end side and the injection shaft is moved to the proximal end side. This makes it possible to apply a compression pressure to the inflatable part via the lock nut.

  Here, it is preferable to interpose a ring-shaped guard ring between the packer portion and the cylinder portion, thereby enabling the cylinder portion or the packer portion to be guarded.

  In addition, it is preferable to provide a spacer between the lock nut and the rubber holder on the front end side, and this makes it possible to increase or decrease the number of inflating parts without changing the length of the injection shaft.

  An embodiment of a mortar injection packer according to the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing a structure along the longitudinal direction of the mortar injection packer of the present embodiment. It is a packer for mortar injection of an example.

  The mortar injection packer 1 of the present embodiment is configured to have a packer portion for forming a closed space in the boring hole and a cylinder portion for operating the packer portion.

  That is, in the figure, reference numeral 2 denotes a packer portion. In this embodiment, this packer portion 2 has an injection shaft 3, and in this embodiment, the injection shaft 3 has a cylindrical shape with a predetermined length.

  A front end side rubber holder and a rear end side rubber holder are provided around each of the front end side outer periphery and the rear end side outer periphery of the injection shaft 3. That is, in the drawing, 4 is a front end side rubber holder, 5 is a rear end side rubber holder, and the front end side rubber holder 4 and the rear end side rubber holder 5 are each made of a metal ring such as aluminum, and the injection shaft 3 is movable in the longitudinal direction.

  Next, reference numeral 6 in the figure denotes an inflating part. That is, in the mortar injection packer 1 of this embodiment, a plurality of inflating portions are provided around the injection shaft 3 between the front end side rubber holder 4 and the rear end side rubber holder 5.

  Here, the expansion portion 6 will be described. In the present embodiment, the expansion portion 6 is formed in a ring shape having a predetermined length made of rubber, and applies compression pressure in the thickness direction, that is, the longitudinal direction of the injection shaft 3. By this, it expands in the outer peripheral direction of the injection shaft 3, and in this expanded state, it has the property of restoring to its original shape when the applied compression pressure is released, and is movable in the longitudinal direction of the injection shaft 3. The outer periphery of the injection shaft 3 is provided.

  Further, an intermediate rubber holder 7 having a ring shape made of metal such as aluminum is provided between the plurality of inflating portions 6, and the intermediate rubber holder 7 moves in the longitudinal direction of the injection shaft 3. It is free.

  Further, a lock nut 8 is connected to the injection shaft 3 at the front end side of the front end side rubber holder 4, and the lock nut 8 connects the front end side rubber holder 4 to the base end side of the injection shaft 3. The compression pressure is applied to the inflatable portion 6 by pressing the

  Next, the cylinder part for operating the packer part 2 configured as described above will be explained. FIG. 2 is an enlarged sectional view of the cylinder part. In the figure, 11 is the cylinder part. In the embodiment, the cylinder part 11 includes a cylinder body in which the inside is sealed, a rod that penetrates the cylinder body while maintaining the sealed state in the cylinder body, and a piston that is provided around the rod in the cylinder body. It has.

  That is, in the figure, reference numeral 12 denotes a cylinder body. In this embodiment, the cylinder body 12 has a cylinder tube 13 made of metal such as aluminum having both ends opened, and this cylinder tube Openings at both ends of 13 are respectively closed by a front end side cylinder head 14 and a rear end side cylinder head 15, whereby the cylinder body 12 is sealed inside.

  Next, 16 in the figure is a piston rod that penetrates the cylinder body 12. That is, in this embodiment, the piston rod 16 is provided, and the piston rod 16 has a hollow cylindrical shape, and the through holes 17 formed in the front end side cylinder head 14 and the rear end side cylinder head 15 respectively. The piston rod 16 penetrates the cylinder body 12 so as to be movable in the longitudinal direction of the cylinder body 12.

  In addition, a sealing member 31 such as packing for sealing the inner wall of the through hole 17 and the outer periphery of the piston rod 16 is disposed in the through hole 17, whereby the piston rod 16 The cylinder body 12 passes through the cylinder body 12 while being movable in the longitudinal direction of the cylinder body 12 while maintaining the sealed state inside the cylinder body 12.

  Further, the tip end of the piston rod 16 is connected to the base end side of the injection shaft 3 constituting the packer portion 2 by screwing or the like, whereby the packer portion 2 and the cylinder portion 11 are integrated. In addition, the piston rod 16 and the injection shaft 3 communicate with each other inside.

  Next, 19 is a piston in the figure. That is, in this embodiment, a piston 19 is provided around the outer periphery of the rod 16 in the cylinder body 12, and moves in the longitudinal direction (in the direction of the arrow in FIG. 2) of the Linder body 12 as the rod 16 moves. It is supposed to be free.

  The piston 19 has an outer peripheral surface that is in close contact with the inner wall of the cylinder body 12 and moves in the cylinder body 12 with the movement of the piston rod 16 while maintaining the close contact state. . That is, the piston 19 partitions the interior of the cylinder body 12 into two chambers 20a and 20b, and the capacity of the chambers 20a and 20b changes as the piston rod 16 moves.

  In the figure, 32 is a sealing member such as packing for bringing the outer peripheral surface of the piston 19 and the inner wall of the cylinder body 12 into close contact, and in the figure, 33 is a gap between the cylinder tube 13 and the cylinder heads 14 and 15. In order to maintain the sealed state in the cylinder body 12 by interposing, an O-ring 34 is a bearing for smooth movement of the rod 16, and 35 is a wear ring.

  Next, 10 is a guard ring in the figure. That is, in the present embodiment, a metal guard ring such as aluminum is interposed between the cylinder body 12 and the rear end side rubber holder 5 in the packer portion 2, whereby the packer portion 2 or the cylinder portion 11. Guarding.

  Next, in the figure, reference numeral 21 denotes a pressure fluid to be supplied to the inside of a chamber 20a (referred to as "actuation side chamber") located on the tip side cylinder head 14 side of the piston 19 inside the cylinder body 12. It is an operation side flow path. That is, in the mortar injection packer 1 of the present embodiment, a pressure fluid is supplied into the cylinder body 12, and the piston 19 is moved and the piston rod 16 is moved by the pressure of the supplied fluid. The injection shaft 3 to which the reference numeral 16 is connected is moved to the proximal end side, and a compression pressure is applied to the expansion portion 6.

  In the mortar injection packer 1 of this embodiment, the operation channel 21 is formed on the inner wall of the cylinder body 12, and the operation channel 21 is opened at the tip of the operation channel 21. As the working fluid supply port 23, the base end portion of the working channel 21 is an working channel inlet 22 that is open to the outside of the cylinder body 12, whereby oil or the like operates from the working fluid inlet 22. The working fluid can be supplied into the cylinder body 12 by injecting the working fluid.

  In addition, the operation flow path supply port 23 is an end portion of the inner wall of the cylinder tube 13 on the front end side cylinder head 14 side, while the piston 19 has a peripheral portion on the end surface on the front end side cylinder head 14 side. A receiving space 27 is formed in the receiving space 27. When the piston 19 is moved to the tip side cylinder head 14 side and the end surface of the piston 19 is brought into contact with the tip side cylinder head 14, the operation space 27 is operated. It is formed at a location leading to the flow path supply port 23.

  With this configuration, in the state where the piston 19 is moved to the tip side cylinder head 14 side and the end surface of the piston 19 is in contact with the tip side cylinder head 14 (state shown in FIG. 1), the operating fluid inlet channel When a working fluid such as a liquid is injected from the supply 22, this working fluid is supplied into the receiving space 27, and the injection of the working fluid is continued, whereby the piston 19 is anti-packered by the pressure of the working fluid. It is possible to move to the side.

  Next, in the figure, reference numeral 24 denotes a chamber 20b (on the rear end side cylinder head 15 side of the piston 19 inside the cylinder body 12 in order to return the piston 19 moved to the side opposite to the packer side to the packer side. This is a release-side flow path for supplying pressure fluid to the inside of the “release-side room”.

  That is, in the mortar injection packer 1 of the present embodiment, a release channel 24 is formed in the rear end side cylinder head 15, and the release channel 24 is opened in the cylinder body 12 at the front end. A fluid supply port 26 is used, and a base end portion of the release channel 24 is a release channel inlet 25 that is open to the outside of the rear end side cylinder body 12.

  With this configuration, when a release fluid such as a liquid is injected from the release fluid inlet 25 in a state where the piston 19 is moved toward the rear end side cylinder head 15 (the state shown in FIG. 3), this release is performed. The release fluid is supplied into the release-side chamber 204b, and by continuing the injection of the release fluid, the piston 19 can be moved to the packer portion side by the pressure of the release fluid.

  Next, the operation of the mortar injection packer 1 of this embodiment configured as described above will be described. In a normal state where the expansion portion 6 is not expanded (the state shown in FIG. 1), the cylinder portion 11 is fixed, When the working fluid is injected from the working fluid inlet 22 to supply the working fluid into the receiving space 27 of the cylinder body 12, and the supply is continued, the piston 19 is moved by the fluid pressure of the working fluid. While moving to the anti-packer part side, the working fluid is supplied into the working chamber 20a of the cylinder body 12, the capacity of the working chamber 20a increases, and the piston 19 is moved accordingly. Move further to the anti-packer part.

  With the movement of the piston 19, the piston rod 16 around which the piston 19 is provided also moves to the side opposite to the packer portion, whereby the injection shaft 3 to which the tip portion of the piston rod 16 is connected. Also move to the anti-packer part side.

  Then, with the movement of the injection shaft 3, the lock nut 8 presses the distal rubber holder 4 toward the proximal end side of the injection shaft 3, and thereby the longitudinal direction of the injection shaft 3 with respect to the expansion portion 6. By applying a compression pressure directed in the direction, the expansion portion 6 can be expanded in the outer peripheral direction of the injection shaft 3. FIG. 3 is a cross-sectional view showing this state.

  That is, in FIG. 3, the expansion portion 6 expands in the outer peripheral direction of the injection shaft 3 by receiving a compression pressure directed in the longitudinal direction of the injection shaft 3. Therefore, in the mortar injection packer 1 according to the present embodiment, an expansion fluid is supplied to the receiving space 27 through the operation-side flow channel 21 in a state where the packer 1 is inserted into the boring hole. 6 can be expanded in the outer circumferential direction, and the lower part of the expansion portion 6 in the borehole can be made a closed space, and in that state, the piston rod 16 and the injection shaft 3 are passed through the inside of the closed space as a ground hardening agent or the like. It is possible to inject a chemical solution such as mortar.

  On the other hand, in the state of FIG. 3 where the expansion portion 6 is inflated by moving the piston 19 to the side opposite to the packer portion, the release fluid is injected from the release fluid inlet 22 and released into the release-side chamber 20b. When the working fluid is supplied, as described above, the piston 19 moves to the packer portion side and the piston rod 16 also moves to the packer portion side due to the pressure of the release fluid. The compression pressure applied to the expansion part 6 is released and the expansion of the expansion part 6 can be released. This state is the state of FIG.

  Thus, in the mortar injection packer 1 of the present embodiment, since the expansion portion can be expanded only by injecting the working fluid, unlike the conventional apparatus in which the compression pressure is applied to the expansion portion by human power. It is possible to easily expand the expanding portion.

  In addition, since the piston in the cylinder body is moved by supplying fluid into the cylinder body with the inside sealed, the fluid supplied into the cylinder body is used only for moving the piston. The pressure of the fluid supplied into the cylinder can be efficiently applied to the piston. Therefore, the expansion portion can be easily and efficiently expanded.

  Further, in the mortar injection packer 1 of this embodiment, unlike the conventional mortar injection packer that uses only a hollow rod to inject a chemical solution to the tip side, the cylinder portion 11 is provided on the injection shaft 3 constituting the packer portion 2. Since the cylindrical piston rod 16 is connected and the chemical supplied from the piston rod 16 side is injected from the tip of the injection shaft 3, it is not necessary to use a long rod even when the borehole is deep. There is also an advantage.

  In the above-described embodiment, the lock nut 8 is connected to the injection shaft 3 at the front end side of the front end rubber holder 4, and the front end rubber holder 4 is moved to the base end side of the injection shaft 3 by the lock nut 8. Although the pressing mode has been described, as shown in FIG. 4, a spacer 9 is interposed between the lock nut 8 and the tip side rubber holder 4, and the tip side rubber holder is connected to the base end via the spacer 9. It may be pressed to the side, and by configuring in this way, it is possible to change the number of inflating portions 6 without changing the length of the injection shaft 3.

  In the mortar injection packer according to the present invention, the working fluid is injected into the cylinder body and the piston and the piston rod in the cylinder body are moved so that the expansion portion can be expanded by applying a compression pressure. In addition, the present invention can be applied to all types of packers that apply a compression pressure to the expansion portion by the action of a cylinder.

DESCRIPTION OF SYMBOLS 1 Packer for mortar injection 2 Packer part 3 Injection shaft 4 Front end side rubber holder 5 Rear end side rubber holder 6 Expansion part 7 Intermediate rubber holder 8 Lock nut 9 Spacer 10 Guard ring 11 Cylinder part 12 Cylinder body 13 Cylinder tube 14 End side cylinder Head 15 Rear end side cylinder head 16 Piston rod 17 Through hole 19 Piston 20 Chamber 21 in cylinder body Actuation side channel 22 Actuation fluid inlet 23 Actuation fluid supply port 24 Release side channel 25 Release fluid inlet 26 Release fluid supply port 27 Receiving space 31 Seal member 32 Seal member 33 O-ring 34 Bearing 35 Wear ring

Claims (3)

A cylindrical injection shaft (3) having a predetermined length;
A tip end side rubber holder (4) and a base end side rubber holder (around the periphery of the tip end side outer periphery and the rear end side outer periphery of the injection shaft (3) are provided so as to be movable in the longitudinal direction of the injection shaft (3). 5) and
Between the front end side rubber holder (4) and the base end side rubber holder (5), an injection shaft (3) is disposed on the outer peripheral side of the injection shaft (3) in an arrangement adjacent to each other via an intermediate rubber holder (7). In the state where it is expanded in the outer peripheral direction of the injection shaft (3) by applying a compression pressure directed in the longitudinal direction of the injection shaft (3), which is movably provided in the longitudinal direction of A plurality of inflatable portions (6) that restore the original shape when the applied compression pressure is released;
A packer portion (2) comprising: a lock nut (8) connected to the tip end side of the tip end side rubber holder (4) in the injection shaft (3);
A cylinder portion (11) for applying a compressive pressure in the longitudinal direction of the injection shaft (3) to the expansion portion (6) disposed on the base end side rubber holder (5) side of the packer portion (2). ), And
The cylinder part (11)
A cylinder body (12) having a cylindrical cylinder tube (13) and a cylinder head (14, 15) having both ends of the cylinder tube (13) closed, and having the inside sealed;
The cylinder body (12) is maintained in a hermetically sealed state so as to be movable in the longitudinal direction of the cylinder body (12) so as to penetrate the cylinder body (12) and at the distal end side of the injection shaft (3). A cylindrical rod (16) connected to
The rod (16) is provided around the cylinder body (12), and the outer peripheral surface thereof is in close contact with the inner wall of the cylinder body (12), and the cylinder (12) moves in the cylinder body (12) as the rod (16) moves. A piston (19) for moving
Formed in the wall of the cylinder body (12) is a flow path (21) having a distal end opened into the cylinder body (12) and a proximal end opened to the outside.
When the piston (16) is moved to the packer part (2), the cylinder body (12) is interposed between the tip surface of the piston (19) and the inner wall of the cylinder body (12) via the flow path (21). Forming a receiving space (27) for receiving the fluid supplied therein;
By supplying fluid to the inside of the cylinder body (12) through the flow path (21), the injection shaft (3) is moved to the proximal side by moving the piston (19) to the side opposite to the packer. The mortar injection packer characterized in that it is possible to apply a compression pressure to the expansion portion (6) through the lock nut (8).   The packer for mortar injection according to claim 2, wherein a guard ring (10) is interposed between the packer part (2) and the cylinder part (11).   The packer for mortar injection according to claim 1 or 2, wherein a spacer (9) is provided between the lock nut (8) and the tip rubber holder (4).

Images