JP3516187B2 - Fixing method of PS anchor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] The present invention relates to, for example, underground power generation.
Cavities, tunnels, etc.
Suitable to be applied to the retaining wall of the intermediate wallPS anchor
-Fixing methodAbout. [0002] [Prior Art] Excavating underground cavities such as underground power plants and tunnels
In general, NATM (New Aust
rian Tunneling Method). This NA
As an example of the structure of the support wall of an underground cavity applying TM
For example, Japanese Patent Publication No. 6-6788 describes the excavation surface of underground cavities.
Polygonal shape formed by steel bars and shotcrete
Lattice structure and a lock cast into the ground from the lattice structure
A technique including a bolt has been proposed. Of this support wall
The inside of the cavity is made of steel bars, shotcrete, etc.
From the digging surface and fixing only near the digging surface
When supporting the whole and preventing concentrated loads by the lattice structure
In both cases, rock bolts are used to loosen rock around the cavity.
It suppresses the ground stress and disperses it. But
However, due to the enlargement of the cavity, the excavation surface
This support that the loose area of the side expands and supports from the inside of the cavity
There is a limit in the lining structure of the retaining wall. Because of this,
Support for the expanded loose area
A support wall structure is required. In recent years, underground power plants and underground storage bases have been developed.
And the like, as shown in FIG.
By spraying on the excavation surface 2 of the cavity formed by excavation
The plurality of sprayed concrete layers 3 formed and the
FIG. 14 (b) from the attached concrete layer 3 toward the ground 1
A plurality of lock bolts 4 and
PS Ann with long PC steel wire introducing restless
The structure of the support wall provided with the car 5 is applied. this
The structure of the support wall is such that the large cavities are
Are all large cross-sections and the range of impact of excavation is large?
Instead of supporting the cavity from the inside,
Anchor 5 at the end of the ground 1
Is intended to support the large cavity by the introduction force. However, the P applied to the above-mentioned support wall
In S anchor 5, PC steel wire of PS anchor 5
It has a weight of 100-150kg / piece, especially above
For orientation work, fix with cement filler and press
Until the tress is introduced, to prevent falling,
The PS anchor 5 must be temporarily fixed. [0005] For this reason, conventionally, a method of temporarily fixing a PC steel wire is used.
As a method, for example, as shown in FIG.
The base end 5b of the line 5a is cast near the base 5b.
Suspended by wire W or the like from the temporary fixing lock bolt 6
A structure for temporarily fixing is used. FIG. 15 shows another temporary fixing method.
As shown in (b), a bare wire is attached to the base end 5b of the PC steel wire 5a.
Attach ring plate 7 and temporarily attach to PC steel wire 5a.
Take the blocking pipe 8 into the fitted state as a stop device.
And buried in the bedrock of shotcrete layer 3 and excavation surface 2
At the same time, the bearing plate 7 is
Cleat layer 3 and blocking pipe 8 with bolt 9
There is also used a structure for fixing by using. [0007] However, as described above,
Conventional fixing method of PS anchorInShown below
There are such issues. First, as shown in FIG.
In the structure, the installation of the temporary fixing lock bolt 6, the wire
There is an inconvenience that it takes time and effort to mount W. Sa
In addition, a PC steel wire 5a is provided at the base end 5b of the PS anchor 5.
Bearing force for transmitting the introduction force of the concrete to the sprayed concrete layer 3
Large disk-shaped bearing plate 7 is installed as a plate
And the bearing plate 7 is heavy.
Therefore, the mounting work required a great deal of labor. [0008] In the structure shown in FIG.
A blocking pipe 8 must be prepared for the PS anchor 5
Must, and blocking pipes on the rock of excavation surface 2
Work such as forming a hole 8a for burying the hole 8 is required
These tasks also took time. The present invention has been made in consideration of the above points.
Easy to fix PS anchors
CanFixing method of PS anchorChallenge to provide
And [0010] The present invention solves the above problems.
In order to decide, the following configuration was adopted. That is, billing
In the fixing method of the PS anchor according to item 1, the ground
Spray REET to form first sprayed concrete layer
From the surface of the first sprayed concrete layer to the ground.
After drilling a hole of the depth determined in
And a flat plate portion formed on the end side.
The fixing member is connected to the other end of the cylindrical portion by the first spraying member.
It is placed at the mouth of the hole in contact with the concrete layer.
Then, concrete is put on the first shotcrete layer.
Spray more than one layer to cover the tubular part of the anchor fixing member
To form a second shotcrete layer, and then
A long PC steel material is struck from the anchor anchoring member into the ground.
And the base end of the PC steel is fixed to the anchor.
After temporarily fixing the PC steel, pre-stress is applied to the PC steel.
By inserting and fixing the proximal end
It is characterized by fixing. [0011] [0012] [0013] [0014] [0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A PS anchor according to the present invention will be described below.
Of fixing methodFirst to fifth embodimentsFIG.
This will be described with reference to FIG. Here, the present invention
PertainHow to fix PS anchor, For example, a very large underground
Explanation using an example of application to a support wall that forms a cavity
I do. [First Embodiment] As shown in FIG.
Excavation surface 2 of underground cavity formed by excavating ground 1
The supporting wall 10 to be blown is provided with a first sprayed concrete layer (first blown concrete layer).
And the second sprayed concrete layer
(Second sprayed concrete layer) 12 and third sprayed conc
Riet layer (second sprayed concrete layer) 13 and fourth blow
Attached concrete layer (second shotcrete layer) 14
And a rock anchor placed in the ground 1 (not shown)
And a long strip that was driven into the ground 1 and prestressed
And the PS anchor 16 of FIG. The first spray concrete layer 11, the second spray concrete
Concrete layer 12, third shotcrete layer 13, fourth
The shotcrete layer 14 has concrete on the digging surface 2
It is formed by being sequentially sprayed to a predetermined thickness. Soshi
And the first spray concrete layer 11 and the second spray concrete
Between the first layer 12 and the third shotcrete layer 13
A welding wire mesh (not shown) is buried. The PS anchor 16 is made of a stranded PC steel wire.
(PC steel) 16a is drilled in the ground 1
Is inserted into a hole 17 of a predetermined depth filled with
In this state, for example, a pre-stress of about 100 t is introduced
Has been established. Base end 16 of this PS anchor 16
b is the second spray concrete layer 12, the third spray concrete
At the predetermined positions of the heat layer 13 and the fourth shotcrete layer 14.
The fixing grip 1 is attached to the embedded anchor fixing member 18.
Established by 9 As shown in FIG. 1 and FIG.
The attaching member 18 is made of metal and has a cylindrical portion 18a having a predetermined length.
And a plate portion integrally provided on one end side of the cylindrical portion 18a
18b, integrally with the cylindrical portion 18a and the plate portion 18b
Are formed from the plurality of ribs 18c, 18c,.
Have been. The ribs 18c, 18c,...
For a long time, in a plane parallel to the axis of the PS anchor 16
And extend radially from the outer peripheral surface of the cylindrical portion 18a.
It is formed. Each rib 18c has a substantially trapezoidal shape.
The length of the cylindrical portion 18a from the outer peripheral surface
The shape is such that it gradually becomes longer as it separates from the
Has been established. Also, as shown in FIG.
The PS anchor 16 (see FIG. 2) is temporarily fixed to 18b.
Temporary fixing holes 20, 20, which are sometimes used, are formed. As shown in FIG. 1, this anchor fixing portion
For the material 18, the end face of the cylindrical portion 18a is formed by a first sprayed concrete layer.
11 and makes the plate portion 18b a fourth spray concrete.
It is arranged so as to be exposed on the surface of the coating layer 14. The support wall 10 is fixed to the ground 1
PS anchor 16 that has been
The loosened area of the excavated surface 2 caused by the excavation is restrained and the ground 1
Structural rock mass is prevented from sliding, forming a strong support structure
are doing. Next, the PS amplifier having the above configuration
A method for fixing the car 16 will be described. This includes
Excavation of the ground 1 to form an underground cavity,
Sprayed concrete and smoothed to some extent
After that, the concrete is sprayed further to make the first spray concrete.
A coating layer 11 is formed. Subsequently, the formed first sprayed concrete layer
A lock anchor (not shown) is placed at a predetermined position 11
To prevent local destruction such as exfoliation of the rock surface near excavation surface 2
I do. To place this lock anchor (not shown)
When drilling a hole (not shown) in the ground 1
Hole 17 for placing car 16 is also drilled in parallel
Keep it. Next, the first sprayed concrete layer 11
After embedding a welding wire mesh (not shown) along the surface of
Anchor at 17 mouthEstablishmentThe member 18 is connected to its cylindrical portion 18a.
Is attached to the first sprayed concrete layer 11.
This includes temporary anchors 21, 21 near holes 17.
Into the anchors 21 and 21 for temporary fixing.
Anchors are fixed by the fixed temporary fixing wires 22 and 22.
EstablishmentThe member 18 is temporarily fixed. Next, the anchorEstablishmentThe cylindrical portion 18 of the member 18
Spray concrete to cover part of a
The attached concrete layer 12 is formed. Then, the second spraying
A wire mesh (not shown) along the surface of the concrete layer 12
And then spray concrete to remove
carEstablishmentA place to cover an intermediate portion of the cylindrical portion 18a of the member 18
The third sprayed concrete layer 13 having a constant thickness is formed. pull
Continue, spray concrete and anchorEstablishmentMember 18
Cover the rest of the building and form the fourth shotcrete layer 14
To achieve. Thereafter, the hole 17 formed in the ground 1 is inserted into the hole 17.
Filling with mortar etc., anchoring PC steel stranded wire 16a
Inside the hole 17 drilled from the cylindrical portion 18a of the attaching member 18 to the ground 1
Into the anchor fixing member 18
Temporarily fix. At this time, the stranded PC steel wire to be cast upward
As the temporary fixing means 16a, for example,
Used. As shown in FIG. 3, the base end of the PC steel stranded wire 16a
A male screw M is formed in the portion 16b, and the male screw M is temporarily
The fixing nut 23 is screwed. In addition, temporarily fixed in the center
A hole 24a smaller than the outer diameter of the fixing nut 23 is formed.
Using the temporary fixing bracket 24, the PC steel stranded wire 16 is inserted into the hole 24a.
a through the plate portion of the anchor fixing member 18
Bolts 25, 2 in the temporary fixing holes 20, 20 formed in
Fix at 5. Thereby, the temporarily fixing nut 23 is temporarily fixed.
Locked by metal fitting 24, PC steel stranded wire 16a falls off
Never flee. In this manner, the stranded PC steel wire 16a is temporarily fixed.
After the mortar in the hole 17 has hardened, the PC steel stranded wire
When introducing pre-stress to 16a, first, temporarily fix
The metal fitting 24 and the temporary fixing nut 23 are removed. This state
In this state, the stranded PC steel wire 16a is
It is held and does not fall out. Then, illustrated
PC steel stranded wire 16
Pre-stress (for example, 100t) by tensioning a
In this state, as shown in FIG.
By attaching the fixing grip 19 to the wire 16a
Thus, the fixing of the PS anchor 16 to the support wall 10 is completed.
You. The fixing method of the PS anchor 16 described above and
And the anchor fixing member 18 used for the
A hole 17 is drilled from the concrete layer 11 toward the ground 1,
Anchor fixing member 18 is connected to its cylindrical portion 18a by a first spraying
It was placed at the mouth of the hole 17 in contact with the concrete layer 11.
After that, the second spray concrete layer 12, the third spray concrete
A layer 13 and a fourth sprayed concrete layer 14 are sequentially formed,
Thereafter, the PC is inserted into the hole 17 from the anchor fixing member 18.
A steel stranded wire 16a is cast and its base end 16b is anchored.
After temporarily fixing to the fixing member 18, pre-stress is introduced
By fixing the base end portion 16b, the PS anchor 16
Is fixed. And anchor anchor
The member 18 is configured such that the cylindrical portion 18a and the plate portion 18b are integrally formed.
The rib 18c is formed on the outer peripheral surface of the cylindrical portion 18a.
Configuration. Thereby, the anchor fixing member
18, the second sprayed concrete layer 1
2, third spray concrete layer 13, fourth spray concrete
When the concrete is sprayed to form the
A hole for placing the anchor 16 can be secured.
Accordingly, the workability can be improved. The PS anchor 16 is temporarily fixed as described above.
Simple and lightweight member such as metal fitting 24 and anchor fixing member 1
8 was temporarily fixed. As a result, the temporary fixing
Lock anchors are no longer necessary, and
No need for shaping or leveling mortar
Can save labor and reduce costs.
Wear. Further, the anchor fixing member 18 is
Function as a support plate for the anchor 16 and the cylindrical portion 1
The ribs 18c, 18c,...
The support pressure is reinforced, so it is smaller and lighter.
Sufficient bearing pressure is secured by the anchor anchoring member 18
This allows a conventional large bearing
The need for a plate is eliminated, improving workability.
it can. Moreover, this anchor fixing member 18 is used for the fourth spraying.
It is configured to be buried in the concrete layer 14
Thus, the appearance of the support wall 10 can be improved. Further, the anchor fixing member 18 is temporarily fixed.
Temporarily fixed with anchor 21 and temporary fixing wire 22
However, also in this case, only the anchor fixing member 18 is temporarily fixed.
As long as it can be used.
Since there is no need to support, anchor 21 for temporary fixing, temporary fixing
Wire 22 can be simplified.
From the point of view, it is possible to reduce costs and improve workability.
Wear. [Second Embodiment] Next, according to the present invention,
Fixing method of PS anchorOf the second embodiment
I will tell. Here, the second embodiment described below,
The difference from the first embodiment is that the PS anchor 16
Anchor fixing member for installing only the support wall
The structure and construction method of 10 itself is the same.
In the following, only the differences will be described and common configurations will be described.
The description is omitted. As shown in FIG. 4, the first shotcrete
Layer 11, second spray concrete layer 12, third spray concrete
A support consisting of a reed layer 13 and a fourth shotcrete layer 14
The PS anchor 16 installed on the retaining wall 10 is anchor-fixed.
It is fixed by the attaching member 28. 4 and 5
As shown, the anchor fixing member 28 is made of metal and has a predetermined shape.
A cylindrical portion 28a having a length and one end of the cylindrical portion 28a
One of the rectangular plate portion 28b and the cylindrical portion 28a
Plate-like ribs 28c, 28c,... Formed on the body, and
Rebars 28d, 28 integrally attached to the ribs 28c
d,... The ribs 28c, 28c, ...
Are PS anchors over the entire length of the cylindrical portion 28a.
16 is located in a plane parallel to
Formed so as to extend radially toward the four corners of the gate portion 28b
Have been. The reinforcing bars 28d, 28d,...
At the positions corresponding to the tip and the middle, respectively, shown in FIG.
In the plane perpendicular to the PS anchor 16
Disposed and joined to adjacent ribs 28c, 28c
I have. In addition, as shown in FIG.
Is temporary when the PS anchor 16 (see FIG. 3) is temporarily fixed.
Temporary fixing hole for attaching the fixing bracket 24 (see FIG. 3)
20, 20 are formed. As shown in FIG.
The fixing member 28 has a tip of the cylindrical portion 28a and a first spray concrete.
In a state where the cylindrical portion 28a is in contact with the heat layer 11,
Are the second shotcrete layers 1
2 and a reinforcing bar 28d, 2 on the intermediate portion side of the cylindrical portion 28a.
8d, ... are buried in the third shotcrete layer 13,
Furthermore, whether the plate portion 28b is the fourth shotcrete layer 14
It is installed in an exposed state. And, for example, 10
PC steel material with a predetermined pre-stress such as 0t
The base end of 16a is anchored by the fixing grip 19.
The image is fixed on the fixing member 28; Using such an anchor fixing member 28,
When fixing the PS anchor 16, the first operation
As in the embodiment, first, the first sprayed concrete layer 11
Is formed, the hole 17 is drilled. And anchor anchor
A mounting member 28 is installed at the mouth of the hole 17 and is temporarily fixed.
An anchor 21 and a temporary fixing wire 22 are used for temporary fixing. Continued
The iron on the tip end side of the cylindrical portion 28a of the anchor fixing member 28
A second spray concrete to cover the streaks 28d, 28d, ...
After the layer 12 is formed, the reinforcing bars 28 in the middle of the cylindrical portion 28a
d, 28d,... so as to cover the third sprayed concrete layer 1
3 and then the fourth shotcrete layer 14 is formed.
To achieve. Thereafter, the hole 17 is removed from the anchor fixing member 18.
A stranded PC steel wire 16a is cast in the
The temporary fixing bracket 24 shown in FIG.
After temporary fixation, prestress is introduced and base end 16b is
By fixing, PS anchor 1 to support wall 10
6 is completed. In the fixing method of the PS anchor 16 described above,
The first blows the anchor fixing member 28 and the cylindrical portion 28a thereof.
Installed at the mouth of the hole 17 in contact with the attached concrete layer 11
I did it. Thereby, the first embodiment and
Similarly, by the cylindrical portion 28a of the anchor fixing member 28,
Second shotcrete layer 12, third shotcast layer
13, a core for forming the fourth shotcrete layer 14;
To install PS anchor 16 when spraying concrete
Holes can be secured, thus improving workability.
Can be made. Further, the above-mentioned anchor fixing member 28
Is formed with plate-like ribs 28c, 28c,.
The ribs 28c have reinforcing bars 28d, 28d,.
It is configured to be attached to the body. This allows
First EmbodimentIn the method of fixing PS anchor
UsingSimilarly to the anchor fixing member 18, the ribs 28c, 2c
8c, the supporting pressure of the anchor fixing member 28 is increased.
Have been. Further, the reinforcing bars 28d, 28d,.
The support wall 10 near the PS anchor 16 is a reinforcing bar
Because it is made of concrete, its supporting pressure is further increased
As a result, the anchor fixing member 28 can be made smaller and lighter.
Can be quantified.
Workability can be improved. [Third Embodiment] Next, according to the present inventionFixing method of PS anchorThird fruit of
An embodiment will be described. Here, a reinforcing bar is installed
According to the present invention,Fixing method of PS anchorSuitable
An example in the case of use will be described. As shown in FIG. 6, the support wall 30 is
Concrete layer 11, second spray concrete layer 12,
The third sprayed concrete layer 13 and the
Buried in the anchor 31 and the third shotcrete layer 13
Reinforced net 32 and pre-stressed
Schematic configuration from a long PS anchor 16 into which
Have been. The lock anchor 31 is filled with mortar.
Is inserted into the hole 31a having a predetermined depth.
Fixture 3 placed on first shotcrete layer 11
3 fixed. As shown in FIG. 6 and FIG.
Are grids that extend in two directions orthogonal to each other.
It is formed from reinforcing bars 32a and 32b arranged in a shape.
You. As shown in FIG. 6, this rebar net 32 is a
Each lock is placed at a predetermined distance from the concrete layer 11.
Tied to the base end of the anchor 31 with a tie wire 34
Fixed and buried in the third shotcrete layer 13
I have. Such a support wall 30 is provided with each PC anchor.
-16, an anchor fixing member 35 is disposed
ing. The anchor fixing member 35 is cylindrical and has a predetermined length.
And a cylindrical portion 35a, which is integrally provided on one end side of the cylindrical portion 35a.
Plate portion 35b and a plane orthogonal to PS anchor 16
The first reinforcing bar (rebar) 35c located inside the
Orthogonal to concrete layer 12 and third shotcrete layer 13
35d extending in the direction of
I have. As shown in FIG. 7, the first reinforcing bar 35c
Is embedded in the second shotcrete layer 12,
At the tip part and the middle part of the cylindrical part 35a, respectively, in a substantially girder shape
The assembled reinforcing bars are welded together. Figure
As shown in FIG. 6, the second reinforcing bar 35d is substantially J-shaped,
One end thereof is welded to the reinforcing bar net 32 and the other end of the curved portion is the first.
It is arranged so that it contacts the shotcrete layer 11.
You. Further, the PS anchor 16 is provided on the plate portion 35b.
When temporarily fixing, remove the temporary fixing bracket 24 (see FIG. 3).
A temporary fixing hole (not shown) for attachment is formed. The anchor fixing member 35 has a cylindrical portion 35a.
With the end face of the abutment in contact with the first sprayed concrete layer 11
It is arranged in. And, for example, 100t
Base end of PC steel 16a with constant prestress
However, the anchor fixing member 35 is fixed by the fixing grip 19.
Has been established. Using such an anchor fixing member 35,
When fixing the PS anchor 16,
First, similarly to the second embodiment, the first spray concrete
After forming the coating layer 11, holes 31a are drilled at predetermined positions.
Then, the lock anchor 31 is cast here. In addition, hole 3
When drilling 1a, the PS anchor 16 was
Holes 17 are simultaneously drilled. Then, at a factory or the like, the anchor fixing member 35
Reinforcement mesh 32 with
-31. At this time, anchor anchor
The first blowing of the cylindrical portion 35a of the member 35 and the second reinforcing bar 35d is performed.
It is brought into contact with the attached concrete layer 11. Next, at least each anchor fixing member 3
5 and the curved portion of the second reinforcement 35d and the first reinforcement 35c.
Spray concrete to cover and spray second concrete
A coating layer 12 is formed. As a result, the reinforcing mesh 32 is securely
The state is fixed to. Further, the reinforcement mesh 32 and the lock anchor
Spray concrete to bury 31
The spray concrete layer 13 is formed. After a while, Ann
A PC steel stranded wire 16a is inserted into the hole 17 from the car fixing member 35.
And the base end portion 16b of the temporary fixing metal 2 shown in FIG.
4 and then temporarily fixed to the anchor fixing member 35.
And fix the base end 16b with the fixing grip 19
By fixing the PS anchor 16 to the support wall 30
Wearing is completed. In the fixing method of the PS anchor 16 described above,
The first blowing of the anchor fixing member 35 and the cylindrical portion 35a thereof
Installed at the mouth of the hole 17 in contact with the attached concrete layer 11
I did it. As a result, the first and second fruits
Form of applicationPS anchorSimilar to the anchoring method, the anchor
The second spray concrete is formed by the cylindrical portion 35a of the fixing member 35.
Layer 12, third sprayed concrete layer 13, fourth sprayed concrete layer
When spraying concrete to form concrete layer 14
In addition, it is necessary to secure a hole for placing the PS anchor 16.
And therefore the workability can be improved.
You. In addition, the anchor fixing member 35 is pre-
Since it is configured to be attached, the anchor fixing member 35
Are temporarily fixed to the anchor 21 and the wire 22 (FIG. 1).
This eliminates the need for temporary fixing
Even so, the workability can be improved. Further, the above-mentioned anchor fixing member 35
Has a first reinforcing bar 35c and a second reinforcing bar 35d.
It has a configuration. Thereby, the first reinforcing bar 35c,
Support near the PS anchor 16 by two reinforcing bars 35d
As the wall 30 is made of reinforced concrete,
The pressure is increased, and as a result, the anchor fixing member 35 is reduced.
Sufficient bearing pressure can be secured even if the mold and weight are reduced,
Workability can be improved. [Fourth Embodiment] Next, according to the present inventionFixing method of PS anchorFourth fruit of
An embodiment will be described. Here, the grid-like frame
According to the present invention on the support wall on which thePS anchor setting
How to wearAn example in which is applied will be described. As shown in FIG. 8, the support wall 40 is
Concrete layer 11, second spray concrete layer 12,
Third shotcrete layer 13, fourth shotcast layer
14, a rock anchor 31 laid in the ground 1,
The child frame 41 and the prestressed
Schematic structure from the long PS anchor 16 into which the
Has been established. The frame body 41 extends along the entire excavation surface 2.
Are arranged and the lock anchors 31, 31,.
Fixed to the base end, the second shotcrete layer 12,
3 shotcrete layer 13, 4th shot concrete layer 1
4 is buried. As shown in FIG. 9, the frame body 41 is
A longitudinal lattice girder 42 extending in the circumferential direction of the cut surface 2
And in the direction perpendicular to this, that is, in the direction of excavation of the underground cavity
The extending lateral lattice girder 43 is combined in a grid pattern.
It is formed by being aligned. Vertical lattice girder 42, horizontal lattice
Each of the girder 43 is a truss-shaped reinforcing member,
Four main members arranged at four corners in cross section and extending in parallel with each other
The muscle S and a plurality of lattices connecting these main muscles S to each other
And the material R. And the vertical lattice
Ends of the lateral girder 43 and the lateral lattice girder 43
Parts have joints located in a plane orthogonal to the direction in which they extend.
Hand plates 42a and 43a are provided. Such a vertical
Lattice girder 42 is oriented along the circumferential direction of
Several pieces are continuously arranged, and the joint plates 42a are brought into contact with each other.
And are connected by bolts B. Also,
Tis girder 43 is formed of vertical lattice girder 42.
With the joint plate 43a in contact with the side surface of the intermediate part,
B linked. The PS anchor 16 is thus constructed
The vertical lattice of the frame body 41 formed in a lattice shape
Predetermined intersection point between the leader 42 and the lateral lattice girder 43
It is installed via an anchor fixing member 45 at the position. As shown in FIG. 10, such a supporting wall 4
The anchor fixing member 45 disposed at 0 is made of metal,
A cylindrical part 45a having a fixed length, and one end of the cylindrical part 45a
The plate portion 45b provided in the
The anchor fixing member 45 is formed integrally with the frame.
Joint plate 4 for attachment to body 41 (see FIG. 8)
5c and 45c. Joining plate 45
c and 45c are spaced apart from each other by a predetermined distance with respect to the cylindrical portion 45a.
Oriented. Here, the joining plates 45c, 45
c, the distance between the inner surfaces is the same as the vertical dimension shown in FIG.
Tis girder 42 width and lateral direction connected to both sides
The thickness of the joint plates 43a, 43a of the lattice girder 43
It is set to be almost the same as the added dimension. And each joint
Bolt holes 46, 46 are formed in the plate 45c.
You. Also, the PS anchor 16 is temporarily attached to the plate portion 45b.
When fixing, the temporary fixing bracket 24 (see FIG. 3) is fixed.
Temporary fixing holes 20, 20 are formed. As shown in FIG. 8, this anchor fixing portion
The material 45 is formed by connecting the plate portion 45b to the excavated surface of the frame body 41.
2 and abut on the surface on the side away from
The first sprayed concrete layer 11 is disposed in contact with the concrete layer 11.
Have been. Then, the joining plates 45c, 45c are
Through the horizontal holes 46, 46 (see FIG. 10).
The longitudinal lattice is integrated with the joint plate 43a of the disc girder 43.
It is bolted to the girder 42,
Anchor member 45 is integrally attached to the frame body 41
Have been. Then, such an anchor fixing member 45
The PC steel stranded wire 16a of the PS anchor 16 is, for example, 1
With the pre-stress of about 00t introduced,
Is fixed by the top 19. Next, the support wall 4 having the above-described configuration is used.
The construction method No. 0 will be described. To do this, first,
As in the first and second embodiments, the first spray concrete
After the formation of the coating layer 11, the lock anchor is
31 is cast. In addition, the lock anchor 31 is cast.
Hole for placing PS anchor 16 when drilling
17 are simultaneously drilled. Then, the frame body 41 is
Assemble and build into a predetermined shape supported by anchor 31
Put in. At this time, the frame body 41 is
The girder 42 and the lateral lattice girder 43 are fixed to a predetermined size.
Assemble the unit into a unit, then anchor
The fixing member 45 is incorporated. And the frame body 4
At the time of installation, the cylindrical portion 45 of the anchor fixing member 45
a to contact the first shotcrete layer 11.
You. After that, the con
Spray cleats to spray second concrete layer 12,
3 shotcrete layer 13, 4th shot concrete layer 1
4 are sequentially formed. Thereafter, the anchor fixing member 45
A stranded PC steel wire 16a into the hole 17 from the
The part 16b is anchored with the temporary fixing bracket 24 shown in FIG.
After temporarily fixed to the member 45, prestress is introduced to
By fixing the portion 16b, the PS
The anchoring of the anchor 16 is completed. In the fixing method of the PS anchor 16 described above,
First blows the anchor fixing member 45 and the cylindrical portion 45a thereof.
Installed at the mouth of the hole 17 in contact with the attached concrete layer 11
I did it. As a result, the first to third fruits
Form of applicationPS anchorSimilar to the anchoring method, the anchor
The second spray concrete is formed by the cylindrical portion 45a of the fixing member 45.
Layer 12, third sprayed concrete layer 13, fourth sprayed concrete layer
When spraying concrete to form concrete layer 14
In addition, it is necessary to secure a hole for placing the PS anchor 16.
And therefore the workability can be improved.
You. Moreover, the anchor fixing member 45 is attached to the frame body 41.
Third Embodiment
Similarly, the anchor fixing member 45 is temporarily fixed to the anchor 2.
1. Temporarily fix with a temporary fixing wire 22 (see FIG. 1)
This eliminates the need and improves workability.
be able to. Further, the anchor fixing member 45 described above
Is a joining plate formed integrally with the plate portion 45c.
45c, the anchor fixing member 45 is framed by 45c.
Vertical lattice girder 42 and horizontal direction
Easy and secure mounting at the intersection with lattice girder 43
Can be opened. [Fifth Embodiment] Next, according to the present inventionFixing method of PS anchorFifth fruit
An embodiment will be described. Here, the following
Difference between the fifth embodiment and the fourth embodiment.
Is an anchor anchoring section for installing the PS anchor 16
Only the material, it depends on the structure of the support wall 40 itself and the construction method.
Are similar, so only the differences will be described.
The description of the common configuration is omitted. As shown in FIG. 11, the support wall 40 is
Shotcrete layer 11 and ground 1
Lock anchor 31 and frame assembled in a grid
And a second body formed to cover the frame body 41.
Shotcrete layer 12, third shotcrete layer 1
3, hitting the fourth shotcrete layer 14 and the ground 1
With the PS anchor 16 installed and prestressed
It is composed of Then, as shown in FIG.
The anchor fixing member 50 is formed in a vertical
Between the lattice girder 42 and the lateral lattice girder 43
A PS anchor is provided at the intersection,
The car 16 is provided. As shown in FIG. 13, the anchor fixing member 5
Reference numeral 0 denotes a metal cylindrical portion 50a having a predetermined length;
0a, a rectangular plate portion 50 integrally provided on one end side
b, from the cylindrical portion 50a to the four corners of the plate portion 50b
The radially extending rectangular plate-like ribs 50c, 50c,...
And a reinforcing bar 50 integrally attached to these ribs 50c.
d, 50d,... Reinforcing bar 50d, 5
0d,... Are located at both ends and an intermediate portion of the cylindrical portion 50a, respectively.
In the plane orthogonal to the PS anchor 16 shown in FIG.
The adjacent vertical lattice girder 42 and the horizontal lattice girder 42
Reinforcing bar so as to extend continuously with main bar S of tis girder 43
Have been. As shown in FIG. 13, the plate portion 50b
When the PS anchor 16 is temporarily fixed, the temporary fixing bracket 2 is used.
4 (see FIG. 3) for temporarily fixing holes 20, 20.
Is formed. The anchor fixing member 50 includes a plate portion
50b is the surface on the side away from the excavation surface 2 of the frame body 41
, And the end face of the cylindrical portion 50a is first sprayed concrete.
It is arranged in a state of being in contact with the layer 11, and
They are integrated by welding or the like. Using such an anchor fixing member 50,
In order to fix the PS anchor 16 to the support wall 40,
The anchor fixing member 50 is attached to the
Otherwise, the support wall 40 described in the fourth embodiment
Perform exactly the same as the construction method. According to the fixing method of the PS anchor 16 described above.
Then, the same effect as the method shown in the fourth embodiment can be obtained.
Can be played. Further, the anchor fixing member 50
Has a reinforcing bar extending in a direction orthogonal to the PS anchor 16.
50d, 50d,... Are provided. This
As a result, it functions as a support plate for PS anchor 16
The vicinity of the anchor anchoring member 50 that is to be
d, ..., the second spray concrete layer 12, the third spray concrete
Forming a cleat layer 13 and a fourth sprayed concrete layer 14
According to the concrete sprayed for
If it becomes reinforced concrete, the bearing pressure will be further increased
be able to. In the fourth and fifth embodiments,
In this case, the frame body 41 is
And a lattice like lateral lattice girder 43
Made of reinforced structural material, for example, truss-shaped reinforced structural material
Steel structural materials, such as steel structural materials made of steel such as steel and H steel
May be. Then, the frame body 41 is formed into a square lattice.
Although constructed, it may be formed in a lattice shape of another shape.
For example, a triangular lattice may be used. Further, the second embodimentPS anchor
Used in the fixing methodIron of anchor anchoring member 28
Streak 28d, the third embodimentPS anchor anchor
Used in the methodFirst reinforcement of anchor anchoring member 35
35c and second reinforcing bar 35d, the fifth embodiment
Used in fixing method of PS anchorAnchor anchor
In the rebar 50 d of the member 50, the PS anchor 16
If the supporting pressure can be increased, the combination type
Shape, number and shape of reinforcing bars used are limited
is not. The first to fifth embodiments are described.of
Fixing method of PS anchorIn the support walls 10, 30,
The number of shotcrete layers composing 40 is limited.
It is not specified, but it depends on the lining thickness, construction procedure, etc.
It may be set appropriately. In addition, PS anchor 16about
In the above embodiment, the material, structure, etc.PS anchor
Used in the fixing methodIt is not limited to
To obtain required performance or ease of construction
For example, in place of the stranded PC steel wire 16a,
A C steel wire, a PC steel bar, or the like may be used. Similarly, lock
Regarding the anchor 31, for example, the lock anchor 31
Instead, various things such as cables can be adopted.
is there. Further, an anchor for fixing the PS anchor 16
Shape of fixing members 18, 28, 35, 45, 50
Similarly, any shape may be used. Further
The anchor fixing members 18, 28, 35, 45, 50
About cylindrical parts 18a, 28a, 35a, 45a, and 50a
Is the second spray concrete layer 12, the third spray concrete
Concrete of layer 13 and fourth shotcrete layer 14
Securing holes for placing PS anchor 16 when spraying
If possible, it may be other than metal. In addition, each of the aboveOf implementationIn the form, the present invention
Was applied to the lining wall of an underground cavity
However, the present invention is not limited to this.
For example, a tunnel support wall, a continuous underground wall retaining wall, or
Can also be applied to slopes and the like. [0076] As described above, according to claim 1,
According to the anchoring method of the S anchor, the first
A hole from the surface of the sprayed concrete layer to the ground
And an anchor fixing member having a cylindrical portion and a plate portion,
The tube is brought into contact with the first sprayed concrete layer to
Installed at the mouth, and then sprayed one or more layers of concrete
To form a second shotcrete layer,
While casting PC steel from the anchor anchoring member,
Temporarily fix the base end of the
Introduce a PS anchor by fixing the proximal end
Is fixed. As a result, the second spray
Spray concrete to form a cleat layer
At this time, the PS anchor is fixed by the cylinder
Holes for car placement can be secured, and workability
Can be improved. In addition, PS anchor
When attaching, the base end of the PS anchor is a simple member
Can be temporarily fixed to the anchor fixing member.
When special members such as lock bolts for fixing are no longer required
In both cases, work such as shaping the surface of the sprayed concrete layer is unnecessary
As a result, efficiency of temporary fixing work and construction cost
Can be reduced. [0077] [0078] [0079] [0080]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a first method of fixing a PS anchor according to the present invention.
It is sectional drawing which shows embodiment . FIG. 2 is a perspective view showing the anchor fixing member shown in FIG. 1; FIG. 3 is a cross-sectional view showing an example of a structure for temporarily fixing a PS anchor to the anchor fixing member. FIG. 4 shows a second example of the method for fixing a PS anchor according to the present invention.
It is sectional drawing which shows embodiment . FIG. 5 is a perspective view showing the anchor fixing member shown in FIG. 4; FIG. 6 shows a third method of fixing a PS anchor according to the present invention.
It is sectional drawing which shows embodiment . FIG. 7 is a plan view of FIG. 6; FIG. 8 shows a fourth method of fixing the PS anchor according to the present invention.
It is sectional drawing which shows embodiment . FIG. 9 is an elevational view showing a lattice-like frame body constituting the support wall shown in FIG. 8; FIG. 10 is a perspective view showing an example of an anchor fixing member incorporated in the frame body. FIG. 11 shows the fifth method of fixing the PS anchor according to the present invention.
It is sectional drawing which shows embodiment . FIG. 12 is an elevational view showing a lattice-like frame body constituting the support wall shown in FIG. 11; FIG. 13 is a perspective view showing an example of an anchor fixing member incorporated in the frame body. FIG. 14 is a schematic cross-sectional view showing a conventional anchor fixing member and a placement diagram of a PC anchor and a lock bolt. FIG. 15 is a sectional view showing a conventional temporary anchoring structure of a PC anchor. [Description of Signs] 1 Ground 2 Excavated surface 11 First sprayed concrete layer (first sprayed concrete layer) 12 Second sprayed concrete layer (second sprayed concrete layer) 13 Third sprayed concrete layer (second sprayed concrete layer) Concrete layer) 14 Fourth spray concrete layer (Second spray concrete layer) 16 PS anchor 16a PC steel strand (PC steel material) 17 Holes 18, 28, 35, 45, 50 Anchor anchoring members 18a, 28a, 35a, 45a , 50a Tube portions 18b, 28b, 35b, 45b, 50b Plate portions 18c, 28c, 50c Ribs 28d, 50d Reinforcing bar 35c First reinforcing bar (rebar) 45c Joining plate

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kosuke Kakimi 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Makoto Hasegawa 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Corporation (72) Inventor Masahiro Seiya 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation Construction (72) Inventor Akira Fujino 1-2-3 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Hidego Kojima 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (56) References JP-A-64-21200 (JP, A) JP-A-53-94406 (JP, A) Jikken 61-23075 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 21/02 E04G 21/12 104 E21D 20/00

Claims (1)

(57) [Claim 1] Concrete is sprayed on the ground to form a first sprayed concrete layer, and a depth defined from the surface of the first sprayed concrete layer toward the ground. After drilling a hole, an anchor fixing member comprising a tubular portion and a flat plate portion formed at one end of the tubular portion is fixed to the first shotcrete by the other end of the tubular portion. A second sprayed concrete layer is formed so as to abut against the layer and to be installed at the mouth of the hole, and then spray one or more pieces of concrete onto the first sprayed concrete layer to cover the tubular portion of the anchor fixing member. Then, after that, a long PC steel material is poured into the ground from the anchor fixing member, and the base end of the PC steel material is temporarily fixed to the anchor fixing member, and then a prestress is introduced into the PC steel material. And fix the base end PS anchor fixing method, characterized in that to fix the PS anchor by.