JP2863970B2 - Joint seal of steel element for continuous underground wall - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint seal for a steel element for a continuous underground wall.

[0002]

2. Description of the Related Art A continuous underground wall is constructed by excavating a trench in the ground while filling with muddy water, and then constructing a steel element having a joint at an end in the trench, and placing concrete in the steel element. Casting is performed by injecting the solidified material into the mud around the steel element. As for concrete casting, there is a case where the concrete is cast inside and outside the steel element, and a case where the muddy water inside and outside the steel element is solidified by the solidifying material without performing the concrete casting. As a method for protecting the joint of the steel element from the solidified material or concrete, there are the following methods.

As shown in FIG. 6, there is a method using a partition sheet F and a wire G. That is, before injecting the solidifying material A, the partition sheet F is disposed in advance in the gap between the groove B and the steel element D, and the wire G is disposed in the joint C. Then, after injecting the solidifying material and placing the concrete, the partition sheet F and the wire G are removed, respectively, to prevent the solidifying material from adhering to the joint of the steel element.

[0004]

[Problems to be Solved by the Invention] The conventional methods for protecting steel element joints have the following problems.
As shown in FIG. 7, there is a case where it is not necessary to install the steel element D to the bottom of the groove B. In this case, if the concrete E is poured into the steel element D, even if the partition sheet F is installed, the concrete E flows out from the lower surface of the element D and goes around the joint C. Therefore, the concrete E adheres to the joint C. Therefore, it cannot be connected to the steel element D to be built next.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and it is an object of the present invention to provide a joint seal capable of completely preventing concrete or solidified material from adhering to a joint of a steel element. It is in.

[0006]

That is, the present invention relates to a band-like member having a substantially trapezoidal cross section for shielding between a joint of a steel element and an interlocking pipe, wherein the band-like member has a thin-walled side surface. A continuous underground comprising a receiving groove opened face-to-face and capable of receiving a joint of a steel element, and a contact surface formed by matching the side surface of the thick portion of the band-shaped member to the shape of an interlocking pipe. It is a joint seal of a steel element for walls.

[0007]

Embodiment 1 An embodiment of a protective material will be described below with reference to the drawings.

<A> Overall Configuration (FIG. 1) FIG. 1 shows a joint seal 30. The joint seal 30 includes a housing groove 311 for housing the joint 41 of the steel element 40,
A sealing member provided with an abutment surface 321 formed on an opposing surface of the accommodation groove and serving as an interlocking pipe 20 serving as a closing body. It is used by mounting.
Hereinafter, each part will be described in detail.

<B> Joint Seal (FIG. 1) The joint seal 30 covers the outer peripheral portion of the joint 41 of the steel element 40 to prevent a solidified material such as concrete from adhering to the joint 41. It is. The joint seal 30 made of reinforced rubber has a substantially trapezoidal cross section, and faces the side surface on the side of the thin portion 31 to accommodate the joint 41 for accommodating the joint 41.
11 are formed along the vertical direction. Housing groove 311
Is formed in a shape that allows the joint 41 to be in close contact with the exterior. The side of the thick portion 32 of the joint seal 30 has a contact surface 3
21 are formed. The contact surface 321 is formed in a shape corresponding to the peripheral surface shape of the interlocking pipe 20 so that the solidified material filled in the excavation groove 50 does not enter between the joint seal 30 and the interlocking pipe 20. ing.

<C> Interlocking Pipe (FIG. 1) The interlocking pipe 20 is built at the end of the excavation groove 50, filled with muddy water or crushed stone, and built in the same excavation groove 50. It is a cylinder for supporting the element 40 and stabilizing the steel element 40. The interlocking pipe 20 is used as a closing body that vertically partitions the excavation groove 50. The outer diameter of the interlocking pipe 20 is formed to be substantially the same length as the width of the excavation groove 50, and the longitudinal length of the interlocking pipe 20 is formed to be substantially the same depth as the depth of the excavation groove 50.

<D> Steel Element (FIG. 1) As shown in FIG. 1, the steel element 40 has two flange plates which form a joint 41 having a partially cut circular cross section at both ends, and are arranged in parallel. A web plate is provided between the flange plates.

[0012]

Next, a method of using the joint seal will be described. <A> Attaching the joint seal (FIGS. 2 and 3) First, as shown in FIG. 2, the joint seal 30 is attached to the steel element 40. That is, the joint 41 of the steel element 40 is accommodated in the accommodation groove 32, and the joint seal 30 is externally provided along the joint 41. As shown in FIG. 3, the lower end of the joint seal 30 is closed with a cap 70 in order to prevent the concrete 60 from entering from the lower end of the joint seal 30.

<B> Construction (FIGS. 1, 2 and 3) Excavation trench 50 excavated at the planned construction location of the continuous underground wall
Inside, a steel element 40 is installed with the joint seal 30 attached. Next, the interlocking pipe 20
Is built in the excavation groove 50. Interlocking pipe 2
1 is installed so that the peripheral surface of the interlocking pipe 20 comes into contact with the contact surface 321 of the joint seal 30 attached to the steel element 40 as shown in FIG. 1 or FIG.

<C> Casting Concrete (FIG. 4) Concrete 60 is cast in the steel element 40.
Since the joint 41 is covered with the joint seal 30, the joint 4
The concrete 60 does not adhere to the inside and outside of 1.

<D> Removal of Interlocking Pipe and Protective Material (FIG. 5) After the concrete is hardened, the interlocking pipe 20 is pulled out of the excavation groove 50. Next, as shown in FIG. 5, the joint seal 30 is pulled from the steel element 40 in the extending direction of the excavation groove 50 and is removed from the steel element 40. Since the joint seal 30 has elasticity, it deforms the steel element 40
Is easy to get off. The surface connecting the housing groove 311 and the contact surface 321 of the joint seal 30 is the housing groove 31.
Since it is formed in a tapered shape toward 1
The joint seal 30 can be easily removed from the steel element 40 and the concrete 60.

<E> Connection of Steel Element After the protective material is removed, the excavation groove 50 is excavated in the longitudinal direction and extended. The steel element 40 in which the joint seal 30 is attached to only one joint 41 is erected in the excavation groove 50. At this time, the joint 41 without the joint seal 30 is connected to the joint 41 of the steel element 40 in the excavation groove 50. Steel element 40 in a digging groove 50
Since the concrete 60 does not adhere to the joint 41, the connecting operation can be easily performed. Then, as described above, the interlocking pipe 20 is installed, the concrete 60 is poured, the steel element 40 and the joint seal 30 are mounted.
Each step of removal is repeated to build a continuous underground wall.

[0017]

Embodiment 2 The interlocking pipe 20 and the joint seal 30 may be provided integrally. In this case, with the joint seal 30 attached to the joint 41 of the steel element 40, the steel element 40 and the interlocking pipe 2 are connected.
The joint seal 30 is detached from the joint 41 together with the interlocking pipe 20 after the concrete is cast.

[0018]

As described above, the present invention has the following effects. <A> Since the joint of the steel element is covered with the joint seal at the time of placing the concrete, it is possible to completely prevent the concrete from adhering to the joint.

<B> Since the joint seal is formed to have a substantially trapezoidal cross section, it can be easily separated from the steel element and concrete in the excavation groove.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a joint seal.

FIG. 2 is a perspective view of a joint seal.

FIG. 3 is an explanatory view of use of a joint seal.

FIG. 4 is an explanatory view of use of a joint seal.

FIG. 5 is an illustration of use of a joint seal.

FIG. 6 is an explanatory view of a conventional protection method.

FIG. 7 is an explanatory view of a conventional protection method.

Claims (1)

(57) [Claims] 1. A band-shaped member having a substantially trapezoidal cross section for shielding between a joint of a steel element and an interlocking pipe, wherein the band-shaped member is opened facing a side surface of a thin portion of the band-shaped member. A joint seal for a steel element for a continuous underground wall, comprising: a housing groove capable of housing a joint; and a contact surface formed by matching a side surface of a thick portion of the band-shaped member to a shape of an interlocking pipe.