JPH05306529A - Concrete wall structure - Google Patents

Abstract

PURPOSE:To exactly control the occurrence of cracks by dry shrinkage of concrete. CONSTITUTION:A crack-inducing region 20 is formed between the front and back faces 2a of a wall 2, and joints 21 are provided in the region 20 in a form of notch in the faces 2a. A mortar tube 3 6f a form of aperture 5 into which a repairing agent is to be packed is buried along the joints 21 in the wall 2. In the region 20, since the wall 2 is lost by the joints 21 and the aperture 5, cracks are concentrated on the lost portions and a repairing material 5 is packed into the aperture 5 to repair the cracks 7. The quality of the concrete wall can thus be maintained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete wall structure suitable for being applied to a wall part of a structure such as a retaining wall or a tunnel lining.

[0002]

2. Description of the Related Art FIG. 9 is a diagram showing a conventional crack suppressing method for a concrete wall. Conventionally, cracks are unavoidably generated on a concrete wall body due to drying shrinkage of the concrete after the concrete is poured and before it is hardened. However, in order to suppress the harmful effects of the cracks, concrete is cracked as shown in FIG. The wall 39 may be provided with a crack-inducing image 40. In such a so-called control joint method, as is known,
The surface 39 of the concrete wall 39 when it is placed and constructed
A crack-inducing image 40 is previously formed by forming a notch from a.
Is formed in such a manner that the wall body 39 has a cross-sectional defect due to the crack-inducing media 40, whereby a crack is forcibly generated only in a portion along the crack-inducing media 40. Then, the tensile stress generated in the portion of the concrete wall body 39 other than the crack-inducing frame 40 is relaxed, the quality of the concrete wall body 39 is maintained, and the location where the crack is repaired later is the crack-inducing frame 4.
For convenience, it is limited to the 0 part only.

[0003]

However, if such a large number of crack-inducing media 40 are formed, the number of defects and repaired parts will increase, which is not preferable. If formed, cracks cannot be surely attracted, and therefore the formation and arrangement of the cracks is extremely difficult and delicate. For this reason, there is a possibility that the crack-inducing media 40 that have been formed will not be useful, and therefore it is difficult to surely induce cracks even with such a method. Therefore, in view of the above circumstances, the present invention provides a concrete wall structure in which the generation of cracks due to drying shrinkage of concrete is accurately controlled so that the quality of the concrete wall can be maintained easily and reliably. is there.

[0004]

That is, the present invention is directed to the front and back surfaces (2a, 2) of concrete wall bodies (2), (12).
a) and (12a, 12b) are provided with a crack inducing region (20) sandwiching the crack inducing media (21) and (121) in the crack inducing region (20), the concrete wall body (2), The front and back surfaces (2a, 2a) of (12),
The repair material filling space (5) is formed in such a manner that the repair material (9) can be filled in the crack inducing region (20) by providing a notch from at least one side of (12a, 12b). The mortar pipe (3) is provided so as to be embedded in the concrete walls (2) and (12) along the crack inducing media (21) and (121). Further, an auxiliary blade pipe (31) that is in communication with the mortar pipe (3) is connected to the mortar pipe (3) so that the auxiliary blade pipe (31) straddles the crack induction region (20). It may be installed and configured. The numbers in parentheses () indicate the corresponding elements in the drawings for the sake of convenience, and therefore the present description is not limited to the description in the drawings. below

The same applies to the column of [Operation].

[0005]

With the above-described structure, the present invention provides the concrete walls (2), (1) in the crack inducing region (20).
2) acts so as to cause a cross-section loss by the crack inducing frames (21) and (121) and the repair material filling space (5). Further, the repair material filling space (5) of the mortar tube (3) may act so as to be expanded by the integral of the internal air cross section of the auxiliary blade tube (31).

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a view showing an example of a concrete wall body, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a view showing an example of a mortar pipe embedded in the concrete wall body shown in FIG. 1, and FIG. The figure which shows another example of a concrete wall body, FIG. 5 is the figure which shows another example of a concrete wall body, FIG. 6 is the top view of FIG. 5, FIG. 7 is the figure which shows another example of a concrete wall body, FIG. 8 is FIG.
FIG.

As shown in FIG. 1, the concrete wall structure 1 has a wall body 2 made of a reinforced concrete frame. The wall body 2 is reinforced by the reinforcing bars 6, 6 shown in FIG. 1 has a predetermined width L1 in the directions of arrows C and D, and is formed in a rectangular parallelepiped wall shape so as to extend in the directions of arrows A and B and the directions of arrows E and F. In the wall body 2, crack-inducing regions 20 are sandwiched between front and back surfaces 2a and 2a shown in the directions C and D, which are the front and back surfaces of the wall body 2, and the crack-inducing regions 20 are arranged at predetermined intervals in the directions A and B. A plurality of L2 are set, and a pair of media 21, 21 facing each other in the directions C and D in the crack inducing region 20 are formed on the front and rear surfaces of the wall 2 as shown in FIG. (Both side surfaces in the directions of arrows C and D) 2a, 2a are formed by notching by a depth L3, respectively, and extend in the directions of arrows E and F (direction intersecting with the plane of FIG. 2) as shown in FIG. Has been. Further, in the crack inducing region 20, a mortar pipe formed between the pair of media 21, 21 provided in the inducing region 20 by mortar extrusion molding and having a strength similar to the concrete strength of the wall body 2 in the shape of a round pipe. 3 are embedded in the wall body 2 in a form of extending in the directions of arrows E and F, that is, along the media 21.

As shown in FIG. 3, the mortar tube 3 has a predetermined inner diameter D1 (10 to 20 mm in the embodiment) and a wall thickness T.
1 (5 mm in the embodiment), the mortar tube 3 has a wall body 2 in which the tube body extending direction indicated by arrows G and H in FIG. It is embedded in the direction of arrows E and F in FIG. Inside the tube body of the mortar tube 3, there is a void 5 having a diameter D1 as shown in FIG. 3, whose extending direction is indicated by an arrow G in FIG.
It is formed in a shape that can be filled with a repair material 9 to be described later toward H, and therefore, the void 5 is a direction in which the extending direction shown in the arrow G, H direction in FIG. 3 is the extending vertical direction of the wall body 2. 1 is arranged in the wall body 2 in the direction of arrows E and F. The mortar tube 3 has the end portions 3b and 3b on both sides in the direction of arrow G and H in the tube body extending direction, and the end surfaces 3b and 3b on both sides in FIG. Is embedded in the wall 2 in a conforming manner, and thus
The void 5 is formed in the body end faces 2b, 2b so as to communicate with the outside of the wall body 2 via the end portions 3b, 3b of the mortar tube 3. Therefore, in the crack-inducing region 20, the wall body 2 has a cross-sectional area in the directions of arrows E and F in the media 21, 21.
The cross-section defect is generated in such a manner that the amount of the voids 5 is smaller than that of the portion other than the crack inducing region 20.

Since the concrete wall body structure 1 has the above-mentioned structure, when constructing the concrete structure 1, first, an appropriate mold suitable for the cast construction shape of the wall body 2 is prepared. Reinforcing bars 6 made of deformed reinforcing bars (not shown) are appropriately arranged in the frame. At this time, in the formwork, the crack-inducing region 2 which is the shape and the arrangement of the media 21 formed on the wall 2 is formed.
A plurality of mold portions are formed so as to be aligned with each other at a height L3 inward in the directions of arrows C and D in FIG. Then, the mortar pipe 3 formed in advance into a shape shown in FIG. 3 by factory processing or the like is placed in a mold for constructing the wall body 2 by arrows E, F of the wall body 2.
Direction length, and then, as shown in FIG.
In order to form the media 21, 21 of the mold by supporting the tube extending direction shown in the arrow G, H direction in the direction of the arrow E, F in FIG. It is placed between the protruding mold parts. At this time, in each mortar tube 3, the end portions 3b, 3b are brought into contact with the mold to remove the mold, and the end portions 3b, 3b are then moved to the arrow E of the wall body 2,
After appropriately positioning and fixing in a shape capable of forming openings in the upper and lower end surfaces 2b, 2b shown in the F direction, concrete is poured into the mold.

When the concrete poured into the mold has hardened after a predetermined time has passed, the mold is appropriately removed from the mold, and the wall 2 has arrows C and D on the front and back surfaces thereof. The front and rear surfaces 2a, 2a shown in the direction are cut out by a predetermined depth L3 to form a pair of media 21 and 21 extending in the directions E and F at predetermined intervals in the directions A and B, respectively. L2 is formed in a predetermined number in pairs in each crack inducing region 20, and the crack inducing region 2 is formed.
At 0, the mortar tube 3 is completed in a form in which the mortar tube 3 is embedded in the wall body 2 between the media 21 and 21 so as to extend along the media 21 and 21 in the directions of arrows E and F. Then, each mortar tube 3
The end portions 3b, 3b of the mortar tube 3 have openings formed on the upper and lower end surfaces 2b, 2b of the wall body 2 in the directions of arrows E and F, and the void 5 formed inside the tube body of the mortar tube 3 is It communicates with the outside of the wall body 2 via the ends 3b, 3b.

By the way, the concrete constituting the wall 2 is dried and shrunk until it hardens with time, so that an internal stress acting in the tensile direction of the wall 2 is generated in the concrete. .. Then the wall 2
In the crack inducing region 20, the cross-sectional area in the direction of the arrows E and F is smaller than that in the region other than the crack inducing region 20 by the amount of the void 5 of the mortar tube 3 in addition to the media 21, 21. Since it is generated, the internal stress generated in the concrete of the wall body 2 is accurately concentrated on the crack inducing region 20 which is the cross-section defective portion in the form of being concentrated on the weak portion of the wall body 2. Then, the crack 7 is forcibly formed in the wall body 2 of the crack inducing region 20 in a form limited only to the inducing region 20 as shown by the alternate long and short dash line in FIG. At this time, since the mortar pipe 3 arranged between the media 21, 21 of the crack inducing region 20 is formed by mortar extrusion molding so that its strength is equal to the concrete strength of the wall body 2, While the cracks 7 are formed in such a manner that the crack shape gradually extends after the cracks 7 are generated, the cracks 7
The cracks 7 are also formed in the mortar tube 3 in such a manner as to be attracted to the voids 5 in the direction intersecting the plane of FIG. And
By forming a crack in the mortar tube 3, the void 5 of the mortar tube 3 and the crack 7 communicate with each other.

Therefore, when the concrete constituting the wall body 2 reaches a predetermined strength due to hardening over time and the drying shrinkage thereof converges, the surface portion of each of the media 21 is appropriately sealed and then each An appropriate repair material 9 such as cement milk or resin mortar is injected into the void 5 of the mortar tube 3 from one end 3b which is one opening of the void 5 at a predetermined pressure. Then, the repair material 9 fills the voids 5 and also fills the cracks 7 communicating with the voids 5 so as to enter the cracks 7. Then, when the injection of the repair material 9 into the void 5 is further continued at the end portion 3b, the excess amount of the repair material 9 injected into the void 5 and the crack 7 is the other opening of the void 5. Since it flows out in a form of being pushed out from the end portion 3b of the above, this means that the injection into the void 5 and the crack 7 is surely filled with the repair material 9,
That is, the completion of filling is confirmed. In this way, when the repair material 9 is injected into the voids 5 of all the mortar pipes 3, the repair material 9 is completely filled in the voids 5 in the wall body 2 and the cracks 7 communicating with the voids 5. Also, there, each media 21
Is aligned with the front and rear surfaces 2a of the wall body 2, and caulking or the like is performed at an appropriate time as needed. Wall 2
In the wall body 2, a crack 7 due to drying shrinkage of the concrete formed only in the crack inducing region 20 is easily repaired from the end 3b of the mortar pipe 3 buried therein via the void 5. The solid and solid construction is completed with all the voids closed and blocked.

By the way, in the above-mentioned embodiment, the concrete wall structure 1 in which the wall body 2 is formed in a rectangular parallelepiped shape has been described, but the concrete wall structure according to the present invention is as shown in FIG. 11 secondary lining 12
May also apply to. In the embodiment shown in FIG. 4, the crack-inducing region 20 is formed in the secondary lining 12 made of reinforced concrete or the like so as to sandwich the inner peripheral surface 12a and the outer peripheral surface 12b which are the front and back surfaces of the secondary lining 12. , A plurality of are set along the inner peripheral direction of the tunnel 11 in the directions of arrows P and Q in FIG.
The secondary lining 12 is formed so as to be cut out from the inner peripheral surface 12a side, which is the front surface side, to a predetermined depth in a direction intersecting with the paper surface of FIG. 4 which is the axial direction of the tunnel 11. .. Further, in the crack inducing region 20, the mortar tube 3 having the void 5 formed therein as shown in FIG.
1 is embedded in the secondary lining 12 in the axial direction of the tunnel 11 in a direction intersecting the plane of FIG.

In the secondary lining 12 as described above, in addition to the internal stress in the tensile direction due to the dry shrinkage as described above, the concrete placed therein is hardened until it hardens. As a result of the lining 12 being constrained by the primary lining 15 from the outer peripheral surface 2b side that is on the outer side in the radial direction, the internal stress exceeding the tensile stress of uncured concrete is in the tunnel inner peripheral direction. It occurs inevitably along the directions of arrows P and Q. Then, in the secondary lining 12, cracks (not shown in FIG. 4) due to internal stress generated in the concrete are generated in the tensile direction inside the cross-section defective portion due to the voids 5 of the mortar pipe 3 in addition to the media 121. The stress is concentrated and is formed only in the crack inducing region 20 and along the axial direction of the tunnel 11 along the direction intersecting the plane of FIG. At this time, the mortar pipe 3 embedded in the secondary lining 12 is, similarly to the mortar pipe 3 embedded in the wall 12 described above, simultaneously with the formation of cracks in the lining 12 in the direction intersecting the plane of FIG. A crack formed in the crack inducing region 20 of the secondary lining 12 and a void 5 of the mortar pipe 3 embedded therein due to the fracture.
Communicate with each other. Therefore, when the repair material 9 (not shown in FIG. 4) such as cement milk is appropriately injected into the mortar pipe 3 while appropriately sealing from the inner peripheral surface 12a side which is the surface side of the secondary lining 12, The repair material 9 was completely filled in the voids 5 in the mortar pipe 3 and the cracks of the secondary lining 12 communicating with the mortar tube 3, whereby the secondary lining 12 repaired and closed all the gaps therein. Completely completed in shape. In addition,
If necessary, the media 121 is formed along the inner peripheral surface 12a of the secondary lining 12 at an appropriate time by backfilling with an appropriate material.
This can be easily filled and closed.

Thus, according to the present invention, it is possible to accurately control the generation of cracks due to the drying shrinkage of the concrete by limiting it to only the crack inducing region 20 and concentrating the cracks in the mortar pipe. Since the repair and filling can be carried out easily and surely through the voids 3 of 3, and the quality of the concrete can be stably maintained,
In addition to the wall body 2 and the secondary lining 12 as described above, for example, in a retaining wall or other concrete wall bodies, cracks are induced and formed only at arbitrary positions, and repaired easily and surely. By doing so, it is possible to finish such concrete wall body into a robust structure. Therefore, the arrangement directions of the media 21, 121, etc. formed in the crack inducing region 20 and the mortar pipe 3 to be embedded therein are not limited to those in the above-mentioned embodiment, and are the most structural in the concrete wall structure. It does not matter if the orientation is set in a direction that does not burden the user.

That is, in the mortar tube 3, as shown in FIG. 5, an auxiliary blade tube 31 made of the same material as the mortar tube 3 and intersecting with the tube 3 is formed so as to pass through the mortar tube 3. In some cases, the auxiliary wing tube 31 may be integrally connected to the wall body 2, and the auxiliary wing tube 31 straddles the crack inducing region 20 between the mesas 21 and 21 of the wall body 2 and extends in the directions of the arrows E and F. A plurality of wall bodies 2 arranged side by side with a predetermined interval in the direction
It is buried inside. Therefore, the voids 5 formed inside the respective auxiliary blade pipes 31 communicate with the voids 5 of the mortar pipe 3 in the directions of the arrows C and D (direction of the wall members), which are the directions in which the cracks 7 are induced in the wall member 2. 2 width direction) and arrows E, F
Voids extending in the directions of arrows A and B, which intersect the direction (extending direction of the wall 2), are formed. As shown in FIG. 6, lids 32, 32 are provided at both ends of each of the auxiliary blade pipes 31 in the directions of arrows A and B, respectively, so that the voids 5 inside the auxiliary blade pipes 31 are closed.
Is provided so as to be shielded and blocked, whereby concrete is prevented from flowing into the voids 5 inside the auxiliary wing pipe 31 and the mortar pipe 3 when the wall body 2 is placed and constructed.

Thus, in the crack-inducing region of the wall body 2 in which the mortar pipe 3 with the auxiliary blade pipe 31 is embedded,
The repair material filling space 5 inside the mortar tube 3 has a shape expanded by the inner-air cross-section integral of the auxiliary blade tube 31, and the void 5 inside the auxiliary blade tube 31 is formed to construct the wall body 2. The arrow A, which is the tensile direction of the internal stress generated in the corn cleat when the installed concrete dries and shrinks,
Since it is extended in the B direction, the concrete internal stress concentrates in the voids 5 in the mortar pipe 3 in a form of being guided to the voids 5 in the auxiliary blade pipe 31. Thus
As shown in FIG. 6, in the crack inducing region 20 of the wall body 2, the crack 7 is more surely formed than when the main body portion of the mortar tube 3 shown in FIG. 3 is embedded (the case shown in FIG. 1). Induced formation.

Further, as shown in FIG. 7, the mortar tube 3 is arranged between the media 21 and 21 in such a manner that the auxiliary wing tubes 31 extending in the directions of arrows A and B straddle the crack inducing region 20. The shape in which the two auxiliary mortar tubes 31 and the two mortar tubes 3 and 3 that penetrate through the two ends 31c and 31c in the arrow A and B directions extend in the directions E and F along the media 21 and 21, respectively. Some of them are embedded in the wall 2.
In the wall body 2 shown in FIG. 7, as shown in FIGS. 7 and 8, in the crack inducing region 20, internal stress due to drying shrinkage of concrete is passed through the cavities 5 and 5 of the two mortar pipes 3 and 3. A relatively wide crack 7 is formed by concentrating it between the media 21 to avoid forming a hair crack over the entire length of the wall 2 in the directions of arrows E and F and limiting it to only the auxiliary blade tube 31. Can be formed. Therefore,
During the work of filling the cracks 7 of the wall body 2 with the repair material 9 later, the work of confirming the cracks 7 and sealing the surface of the wall body 2 becomes easy, and thus the wall body 2 is more surely solid and solid. It is possible to finish the structure.

In the above-mentioned embodiment, the wall 2
The mortar tube 3 embedded in the mortar tube 3 has a strength similar to the concrete strength of the wall body 2 and is formed into a round pipe shape by extrusion molding.
As long as cracks 7 are formed in the wall body 2 along with the cracks so that the inside of the voids 5 and the like can communicate with the cracks 7, the structure is: It is optional, for example, when the concrete strength of the wall body 2 is high, in order to follow the high concrete strength, when the mortar pipe 3 is molded, an appropriate additive or polymer is appropriately mixed. You can leave it. The mortar pipe 3 described in the examples refers to a mortar made of cement, fine aggregate, and mortar whose main materials are water, and has the same strength as the concrete of the wall body 2 and the secondary lining 12, Therefore, the mortar tube 3 is the wall 2,
As long as the secondary lining 12 is configured so that it can be fractured in the same manner as cracks when it occurs, any material may be used in any combination, for example, It does not matter that some kind of resin material or the like is mixed in the mortar that constitutes the mortar tube 3.

[0020]

As described above, according to the present invention,
In the concrete wall body such as the wall body 2 and the secondary lining 12, front and rear surfaces 2a and 2b, the inner peripheral surface 12a and the outer peripheral surface 12b, etc. The crack-inducing areas, such as the media 21 and 121, are provided in the crack-inducing area in the form of notches from at least one of the front and back surfaces of the concrete wall, and the repair material is provided inside the crack-inducing area 20. Since the mortar tube 3 in which the repair material filling space such as the void 5 is formed so as to be filled with 9 is provided so as to be embedded in the concrete wall along the crack inducing media, the crack inducing region 20 In, the concrete wall body can be damaged in cross section by the crack inducing image and the space filled with the repair material. Then, when internal stress occurs in the concrete wall due to drying shrinkage of concrete, etc., the stress concentrates in the form of being attracted to the crack-inducing region, which is the cross-section defect portion, and is limited only to the crack-inducing region. A crack is certainly generated here in the formed form. Therefore, if the strength of the mortar pipe 3 is formed to be equivalent to that of the concrete wall body, when the crack is formed in the concrete wall body in the crack inducing region, the mortar pipe 3 is also broken at the same time, A crack communicates with the repair material filling region inside the mortar tube 3. Therefore, if a suitable repair material 9 such as cement milk is injected into the repair material filling space through the end portion 3b of the mortar pipe 3 at an appropriate time after the concrete is poured into the concrete wall body, the repair can be performed. All the gaps in the concrete wall body are easily filled and blocked in such a manner that the material 9 is also filled in the cracks formed in the concrete wall body through the repair material filling space. Therefore, according to the present invention, in the concrete wall portion of a structure such as a retaining wall or a tunnel lining,
It is extremely efficient and easy to maintain a high quality by making the concrete wall body a robust structure by accurately controlling the occurrence of cracks due to drying shrinkage of concrete and repairing it later. You can Further, the mortar tube 3 is provided with an auxiliary wing tube 31 that is in communication with the mortar tube 3, and the auxiliary wing tube 31 is the crack induction region 2
If it is configured to be connected and mounted so as to straddle 0, the mortar tube 3
The repair material filling space can be expanded by the integral of the internal cross-section of the auxiliary blade tube 31. Since the auxiliary wing tube 31 is disposed in the crack-inducing region of the concrete wall in a form of extending in the direction intersecting with the crack-inducing media, the internal stress generated in the concrete due to the drying shrinkage of the concrete is reduced. Through the repair material filling space inside the blade tube, it becomes possible to accurately concentrate in a further limited portion in the crack induction region. Therefore, the form of cracks formed in the crack-inducing region is limited to the direction in which the structural wall is the least structurally burdensome in such a concrete wall structure, with more precise control and easy repair. It is possible to secure the structure and to finish the concrete wall body into a structure of higher quality.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a concrete wall body.

FIG. 2 is a plan view of FIG.

FIG. 3 is a diagram showing an example of a mortar pipe embedded in the concrete wall body shown in FIG.

FIG. 4 is a diagram showing another example of a concrete wall body.

FIG. 5 is a diagram showing still another example of the concrete wall body.

FIG. 6 is a plan view of FIG.

FIG. 7 is a view showing still another example of the concrete wall body.

FIG. 8 is a plan view of FIG.

FIG. 9 is a diagram showing a conventional crack suppressing method for a concrete wall.

[Explanation of symbols]

 2 ... Concrete wall body (wall body) 12 ... Concrete wall body (secondary lining) 2a ... Front and back surfaces (front and back surfaces) 12a, 12b ... Front and back surface (inner peripheral surface, Outer peripheral surface) 20 ... crack inducing area 21 ... crack inducing media (media) 121 ... crack inducing media (medium) 3 ... mortar tube 5 ... repair material filling space (void) 9 ... repair material 31 ... Aileron tube

Claims (2)

[Claims] 1. A crack-inducing region is provided so as to sandwich the front and back faces of a concrete wall, and a crack-inducing media is provided in the crack-inducing region from at least one side of the front and back faces of the concrete wall. Provided in the form of a notch, in the crack induction region, a mortar pipe in which a repair material filling space is formed so that a repair material can be filled inside is embedded in the concrete wall along the crack induction media. A concrete wall structure constructed in a shape. 2. The mortar tube is configured by connecting and mounting an auxiliary wing tube that is in communication with the mortar tube such that the auxiliary wing tube straddles the crack induction region. Concrete wall structure.