JP2014101709A - Continuous wall member and continuous wall construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a continuous wall member that can enhance filling properties of a filler such as soil mortar in continuous wall construction, and a continuous wall construction method using the same.SOLUTION: Steel-made continuous wall members 1a, 1b are steel materials in an H shape and have joints used for connection at both ends of flanges 5, 7. The flanges 5, 7 are provided with holes 17, 18 respectively. When a steel-made continuous wall 1 is constructed, the steel-made continuous wall members 1a, 1b are connected to each other and built in an excavation part 39 with a screw protection ring 21 fitted to a female screw 19 on an inner peripheral surface of the hole 17. Then soil mortar 45 is injected and charged in the part 42 inside the flanges 5, 7 surrounded with the steel-made continuous wall members 1a, 1b. The soil mortar 45 flows through the holes 17, 18 to parts 44, 46 formed with outside excavation part side faces of the flanges 5, 7. After the soil mortar 45 is hardened, the screw protection ring 21 is removed from the hole 17, and a cutoff cap 29 is fitted instead.

Description

  The present invention relates to a continuous wall member and a continuous wall construction method.

  Conventionally, as a method for constructing an underground wall, there is a method called a steel underground continuous wall construction method. The steel underground continuous wall method is constructed by connecting multiple steel continuous wall members with male or female joints at both ends of the flange of an H-shaped steel material to the excavated part excavating the ground while connecting them together. (For example, refer to Patent Document 1).

  As a steel continuous wall method, the steel wall member is installed in the excavated part excavated while being filled with the stable liquid by the stable liquid excavation method, and then the stable liquid is replaced with concrete. There is a construction method.

  An example of the steel continuous wall constructed in this way is shown in FIG. As shown in FIG. 8, in the steel connection wall 113, the steel connection wall members 110a and 110b are connected to the inside of the female joint 112b of the one member 110b on the excavation part 39 excavating the ground 100. It is built while being connected through the male joint 112 a, and its periphery is filled with concrete 111.

  In this construction method, the period of building the steel continuous wall member for post-filling the concrete is not limited, for example, there is an advantage that it may take several days, but for the purpose of increasing the filling property by flowing the concrete, Since the male joint 112a of the steel continuous wall member 110a is intermittently provided in the height direction of the flange, when cracks or the like occur in the concrete 111, water leaks through the intermittently provided male joint 112a. There is a fear.

  On the other hand, as a steel ground wall continuous wall construction method, a construction method is also known in which a soil mortar is created by an in-situ soil agitation work while excavating an excavation part, and a steel continuous wall member is built therein. This construction method has the advantage that it is easy to ensure water sealing without the need to intermittently provide male joints for steel continuous wall members, but because it is necessary to build the members before the soil mortar solidifies, road regulations, etc. If the possible construction period is limited, construction becomes difficult.

JP 2001-254352 A

  Therefore, as a combination of the advantages of these methods, a steel wall member is installed in the excavated part excavated while being filled with the stable liquid by the stable liquid excavation method, and then the stable liquid is soil mortar (fluidized). A method of replacement with treated soil) is conceivable.

  This construction method does not limit the period in which the steel continuous wall member is built in order to post-fill the soil mortar. Moreover, the male joint of the steel continuous wall member is continuously provided in the flange height direction, so that the above-mentioned problem of water stoppage can be avoided.

  However, if the male joint is continuously provided in the flange height direction, the soil mortar does not flow well between the portion between the side of the excavation part outside the flange and the portion inside the flange, and the filling property is reduced. Since there is a risk of a slight decrease, it is desirable to have a separate means for improving the filling property.

  The present invention has been made in view of the above-described problems, and provides a continuous wall member capable of enhancing the filling property of a filler such as soil mortar at the time of continuous wall construction, and a continuous wall construction method using the same. The purpose is to do.

  A first invention for achieving the above-described object is a continuous wall member for connecting to each other to construct a continuous wall, comprising a flange and a web, and a joint used for connection at the end of the flange. And a flange is provided with a hole in the flange.

  By providing a hole in the flange of the continuous wall member, when the continuous wall is constructed, the continuous wall member is connected to each other by a joint of the flange, and then the filler is filled with the excavation part outside the flange. It is possible to reliably flow the filler through the hole between the portion between the side surface and the portion inside the flange, thereby preventing the occurrence of poor filling.

It is desirable that a screw portion for attaching a water stop cap is provided on the inner peripheral surface of the hole.
Thereby, after filling with the filler, the water stop cap can be securely fixed to the hole of the flange to close the hole, and water leakage can be prevented even when the filler is cracked.

Moreover, it is desirable that a screw protection ring is detachably attached to the screw portion.
Thereby, it can protect so that a screw part may be damaged or a filler may not adhere at the time of filling of a filler.

Further, a reinforcing plate may be fixed around the hole.
Thereby, the location which provided the hole in a continuous wall member can be reinforced.

Furthermore, it is preferable that holes are provided in the web, and the holes of the flange and the holes of the web are arranged in a staggered manner along the height direction of the continuous wall member.
Thereby, the filling property of the filler is further enhanced, and a structurally weak portion is not generated.

  2nd invention inserts the continuous wall member in the excavation part which excavated the ground, inserts the male joint of the other continuous wall member inside the female joint of one continuous wall member, and builds it up while mutually connecting (A) and a step (b) of filling the excavation part with a filler, the connecting wall member comprising a flange and a web, and a male joint or a female joint used for connection at the end of the flange. And a hole is provided in the flange in at least some of the wall members.

  By providing a hole in the flange of the continuous wall member, when filling the filler in the above process, a hole is formed between the portion between the side of the excavation part outside the flange and the portion inside the flange. Thus, the filler can be surely flowed to prevent the occurrence of defective filling.

It is preferable that the hole of the flange is closed after the step (b).
By closing the hole of the flange after filling with the filler, water leakage can be prevented even when the filler is cracked.

A screw portion is provided on the inner peripheral surface of the hole of the flange, and a screw protection ring is attached to the screw portion in the steps (a) and (b), and the screw protection ring is attached after the step (b). It is desirable to remove, attach a water stop cap to the threaded portion, and close the hole of the flange.
Thereby, after filling with the filler, the water stop cap can be securely fixed to the hole of the flange and the hole can be closed. Further, it is possible to protect the screw portion from being damaged or the filler from adhering at the time of filling the filler.

In the step (a), it is desirable to excavate the ground while filling the excavation part with a stabilizing liquid, and in the step (b), the stabilizing liquid is replaced with soil mortar or fluidized soil as the filler. .
When soil mortar or fluidity-treated soil is used as the filler, the joint can be continuously provided in the height direction of the continuous wall member. Can be increased.

  ADVANTAGE OF THE INVENTION According to this invention, the continuous wall member which can improve the filling property of fillers, such as soil mortar, and the continuous wall construction method using the same can be provided at the time of continuous wall construction.

The figure which shows the outline | summary of steel connection wall members 1a and 1b The figure which shows the hole 17, the screw protection ring 21, and the water stop cap 29 The figure which shows the construction method of the steel connection wall 1 Enlarged view near hole 17 The figure which shows the steel connection wall 1 Enlarged view near hole 17 The figure which shows the reinforcement boards 53 and 61 The figure which shows the steel connection wall 113

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  Drawing 1 is a figure showing steel connection wall members 1a and 1b (connection wall member) concerning an embodiment of the present invention. The steel continuous wall members 1a and 1b are used when they are connected to each other to construct a steel continuous wall (continuous wall) described later. Fig.1 (a) shows the steel continuous wall member 1a which has the male joint 9a. FIG.1 (b) shows the steel continuous wall member 1b which has the female joint 9b.

  As shown in FIGS. 1 (a) and 1 (b), the steel continuous wall members 1a and 1b are steel materials having an H-shape in which the center portions in the width direction of the pair of flanges 5 and 7 are connected by a web 3. Yes, joints are provided at both end portions of the flanges 5 and 7 in the width direction. The steel joint wall member 1a is provided with a male joint 9a, and the steel joint wall member 1b is provided with a female joint 9b. In the present embodiment, the male joint 9a is formed in a T shape, and the female joint 9b has a shape in which a part of the circumference is cut out. The male joint 9a and the female joint 9b are continuously provided in the height direction of the steel continuous wall members 1a and 1b. The steel continuous wall members 1a and 1b can be connected to each other by inserting the male joint 9a of the steel continuous wall member 1a into the female joint 9b of the steel continuous wall member 1b.

  The web 3 of the steel continuous wall member 1a is provided with holes 11, and the flanges 5 and 7 are provided with holes 17 and 18, respectively. The holes 17 are provided in a row in the flange height direction at locations corresponding to both sides of the web 3 on the flange surface. The holes 11 of the web 3 and the holes 17 of the flange 5 are staggered along the height direction of the steel continuous wall member 1a. The holes 18 are also arranged in the same manner as the holes 17.

  Similarly, in the steel continuous wall member 1 b, holes 11 are provided in the web 3, and holes 17 and 18 are provided in the flanges 5 and 7.

  In the steel continuous wall members 1a and 1b, the diameter of the hole 11 of the web 3 is, for example, 200 mm. It is desirable that the installation interval 13 in the vertical direction of the holes 11 is 1 m or more as a measure against water leakage after formation of the continuous walls. For example, if it is 4 m or more and 5 m or less (20 to 25 times the diameter of the hole 11), it is preferable from the viewpoint of filling properties and member strength in addition to water-stopping properties.

  The diameter of the hole 17 of the flange 5 is, for example, smaller than the hole 11 of the web 3 and is 100 mm. As with the above, it is desirable that the installation interval 15 in the vertical direction of the holes 17 is 1 m or more as a countermeasure against water leakage after the continuous wall is formed. The installation interval 15 is set in accordance with the installation interval 13 of the holes 11 so that a staggered arrangement is possible. For example, the installation interval 15 is 4 m or more and 5 m or less (40 to 50 times the diameter of the hole 17) as described above. From the viewpoint similar to the above, it is preferable. The diameter of the hole 18 of the flange 7 and the installation interval can be similarly determined.

  However, the size and installation interval of the holes 11, 17, and 18 of the steel continuous wall members 1a and 1b are not limited to this, and can be appropriately determined in consideration of water-stopping property, filling property, member strength, and the like.

  FIG. 2A is an enlarged view showing the vicinity of the hole 17. As shown in FIG. 2A, the inner surface of the hole 17 is threaded to form a female screw 19 (threaded portion).

  A screw protection ring 21 shown in FIG. 2B and a water stop cap 29 shown in FIG. 2C can be attached to the hole 17.

  As shown in FIG. 2B, the screw protection ring 21 includes a head 23 having a diameter larger than that of the hole 17 and a main body 25 having a male screw 27 formed on the outer peripheral surface. The screw protection ring 21 has a hole 24 that passes through the head 23 and the main body 25. The screw protection ring 21 can be attached to the hole 17 by screwing the male screw 27 of the main body 25 and the female screw 19 of the hole 17. It can also be removed.

  As shown in FIG. 2C, the water stop cap 29 includes a head portion 31 having a diameter larger than that of the hole 17 and a main body 33 having an external thread 35 formed on the outer peripheral surface. The water stop cap 29 can be attached to the hole 17 in the same manner as described above by screwing the male screw 35 of the main body 33 and the female screw 19 of the hole 17. It can also be removed.

  Next, with reference to FIGS. 3-6, the construction method of the steel connection wall using said steel connection wall members 1a, 1b etc. is demonstrated.

  In order to construct a steel continuous wall, first, as shown in FIG. 3A, the ground 100 is excavated to form an excavation part 39. At this time, excavation is performed while the excavation part 39 is filled with the stabilization liquid 41 by the stable liquid excavation method.

  Next, as shown in FIG. 3 (b), a plurality of steel continuous wall members 1a and 1b are connected to the excavation part 39 through the male joint 9a of the other member 1a inside the female joint 9b of the one member 1b. However, it builds continuously. Further, a tremy tube 43 is arranged in a portion 42 inside the flanges 5 and 7 surrounded by the steel continuous wall members 1a and 1b. In addition, FIG.3 (b) has shown the cross section of the height of the holes 17 and 18 of the steel continuous wall members 1a and 1b. The same applies to FIG. 3C and FIG.

  FIG. 4 is an enlarged view of the vicinity of the hole 17 in FIG. In the present embodiment, the screw protection ring 21 is attached to the hole 17 of the flange 5 of the steel continuous wall members 1a and 1b before installation in the excavation part 39 as described above.

  Returning to the description of FIG. After building the steel continuous wall members 1a and 1b as shown in FIG. 3 (b), the soil mortar is injected into the inner portion 42 of the flanges 5 and 7 from the tremy tube 43. The injected soil mortar flows into the portion 44 between the side of the excavation part on the outer side of the flange 5 through the hole 24 (see FIG. 4) of the screw protection ring 21 attached to the hole 17 of the flange 5. Moreover, it flows into the part 46 between the excavation part side surface outside the flange 7 through the hole 18 of the flange 7. Moreover, it flows between the adjacent parts 42 through the hole 11 (refer FIG. 1) of the web 3. FIG.

  Thus, as shown in FIG. 3C, the soil mortar 45 is placed in the excavation part 39, and is replaced with the above-mentioned stabilizing liquid 41 and filled. The soil mortar 45 is, for example, adjusted to have a flow value of 160 cm or more and 240 cm or less and a specific gravity of 1.5 or more. There is no.

  When the soil mortar 45 is solidified, the steel continuous wall 1 is constructed. In the present embodiment, the ground 100 inside the steel continuous wall 1 (the lower side in FIG. 3C) is further excavated. Next, the soil mortar 45 on the outer portion 44 of the flange 5 is removed. Then, the screw protection ring 21 attached to the hole 17 is removed, and instead, the water stop cap 29 is attached as described above, and the hole 17 is closed. This state is shown in FIG. In addition, in a space formed by excavating the inside of the steel continuous wall 1, for example, an underground frame such as a tunnel is constructed later.

  FIG. 6 is an enlarged view of the vicinity of the hole 17 in FIG. As shown in the drawing, when the water stop cap 29 is attached, an O-ring 51 such as rubber is sandwiched between the head 31 of the water stop cap 29 and the flange 5 to ensure water stop. However, the O-ring 51 can be omitted.

  Thus, according to this embodiment, by providing the holes 17 and 18 in the flanges 5 and 7 of the steel continuous wall members 1a and 1b, the steel continuous wall members 1a and 1b are joined by the joints of the flanges 5 and 7. When the soil mortar 45 is filled after being connected to each other, when the soil mortar 45 is filled, the portions 44 and 46 between the flanges 5 and 7 and the portion 42 inside the flanges 5 and 7 In the meantime, the soil mortar 45 can be surely flowed through the holes 17 and 18 to prevent the occurrence of poor filling, and the integrity of the steel continuous wall members 1a and 1b and the soil mortar 45 is enhanced.

  Moreover, in this embodiment, the internal thread 19 is provided in the inner peripheral surface of the hole 17 of the flange 5, and when the steel continuous wall members 1a and 1b are installed or when the soil mortar 45 is filled, the screw protection ring 21 is provided in the hole 17. After the soil mortar 45 is solidified, the screw mortar 45 on the outer portion 44 of the flange 5 is removed and the screw protection ring 21 is removed. Instead, the water stop cap 29 is attached to the hole 17 to close the hole 17. To do. As a result, the water stop cap 29 can be securely fixed to the hole 17 and the hole 17 can be closed, and even when cracking or the like occurs after the soil mortar 45 is solidified, the water stop around the hole 17 can be secured and water leakage can be prevented. can do. Further, when the soil mortar 45 is filled, the female screw 19 of the hole 17 can be protected from being damaged or the soil mortar 45 is not attached.

  Furthermore, in this embodiment, the hole 11 is provided also in the web 3, and the hole 11 and the holes 17 and 18 of the flanges 5 and 7 are staggered along the height direction of the steel continuous wall members 1a and 1b. Placed in. As a result, the soil mortar 45 can flow between the portions 42 adjacent to each other with the web 3 interposed therebetween, so that the filling property is improved and no structurally weak portions are formed in the steel continuous wall members 1a and 1b.

  In this embodiment, a reinforcing plate may be fixed around the holes 17 and 18 of the flanges 5 and 7 and the hole 11 of the web 3. FIG. 7A is an enlarged view of the vicinity of the hole 17 in this case. For example, when the hole 17 is provided in the flange 5 and the steel continuous wall members 1 a and 1 b do not satisfy a predetermined section modulus, the reinforcing plate 61 is fixed around the hole 17. The reinforcing plate 61 has a hole 63 that is slightly larger than the hole 17, and the hole 63 and the hole 17 are aligned and fixed to the flange 5. Similarly, in the flange 7, a reinforcing plate can be fixed in the vicinity of the hole 18. Further, as shown in FIG. 7B, also in the web 3, a reinforcing plate 53 having a hole 55 slightly larger than the hole 11 is fixed to the web 3 by aligning the positions of the hole 55 and the hole 11 and reinforced in the same manner. Can do. In addition, the shape, arrangement | positioning, etc. of a reinforcement board are determined according to the objective of reinforcement, and are not restricted to an above-described thing.

  In the present embodiment, the soil mortar 45 is used as the filler, but fluidized soil may be used. When soil mortar or fluidized soil is used, the joint can be continuously provided in the height direction of the flange, and the water stop performance at the joint portion can be enhanced as compared with the case where concrete is used.

  Moreover, in this embodiment, although the hole was provided in the flange in both the steel continuous wall members 1a and 1b, you may provide only in one member. For example, since the flanges 5 and 7 of the steel continuous wall member 1b having the female joint 9b are formed to be relatively thin, holes may be provided only in the flanges 5 and 7 of the steel continuous wall member 1b. Furthermore, in this embodiment, since a screw protection ring or a water stop cap is not attached to the hole 18 of the flange 7, the internal thread of the inner peripheral surface is omitted. However, as the steel connecting wall members 1a and 1b, both flanges are used. The female screw 19 is provided on the inner peripheral surface of the holes 17 and 18 of the fifth and seventh holes, and when used, a screw protection ring is attached to the hole of the appropriate side flange, and the following procedure is followed. May be.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

DESCRIPTION OF SYMBOLS 1,113 ......... Steel underground continuous wall 1a, 1b, 110a, 110b ......... Steel connection wall member 3 ......... Web 5, 7 ......... Flange 9a, 112a ......... Male joint 9b, 112b ......... Female joint 11, 17, 18, 24, 55, 63 ......... Hole 19 ......... Female screw 21 ......... Screw protection ring 27, 35 ......... Male screw 29 ......... Water stop cap 39 ......... Excavation part 41 ……… Stabilizer 45 ……… Soil mortar 53, 61 ……… Reinforcement plate 100 ……… Ground

Claims (9)

A connecting wall member for connecting to each other to form a connecting wall,
Consisting of a flange and a web,
Provided with a joint used for connection at the end of the flange,
A connecting wall member, wherein the flange is provided with a hole.   The connecting wall member according to claim 1, wherein a screw portion for attaching a water stop cap is provided on an inner peripheral surface of the hole.   The connecting wall member according to claim 2, wherein a screw protection ring is detachably attached to the screw portion.   The connecting wall member according to any one of claims 1 to 3, wherein a reinforcing plate is fixed around the hole.   The hole is provided in the said web, The hole of the said flange and the hole of the said web are arrange | positioned in a staggered form along the height direction of a continuous wall member, Any one of Claim 1 to 4 characterized by the above-mentioned. The continuous wall member according to any one of the above. The step of building the connecting wall member into the excavated part excavating the ground, inserting the male joint of the other connecting wall member inside the female joint of the one connecting wall member and connecting them together (a);
Filling the excavation part with a filler (b);
Comprising
The connecting wall member includes a flange and a web, and includes a male joint or a female joint used for connection at an end of the flange, and at least a part of the connecting wall member is provided with a hole in the flange. Wall construction method.   The method for constructing a continuous wall according to claim 6, wherein the hole of the flange is closed after the step (b). A threaded portion is provided on the inner peripheral surface of the hole of the flange,
In the steps (a) and (b), a screw protection ring is attached to the screw portion. After the step (b), the screw protection ring is removed, a water stop cap is attached to the screw portion, and the flange 8. The method for constructing a continuous wall according to claim 7, wherein the holes are closed. In the step (a), excavating the ground while filling the excavation part with a stable liquid,
The method for constructing a continuous wall according to any one of claims 6 to 8, wherein in the step (b), the stabilizing liquid is replaced with soil mortar or fluidized soil as the filler.

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