JPH0573093U - Bag for expanding holes - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the pressure resistance and durability of the bag for expanding holes, which is applied to the method for improving the consolidation of soft ground. [Structure] The warp threads (10a) arranged in the longitudinal direction of the bag body (11) are centrally gathered at both ends of the bag body (11) in an umbrella-bone shape to form a conical shape of the warp thread (10a). A cloth bag (10) having a conical portion (10c) formed by weaving a weft thread (10b) in a spiral shape was arranged outside the bag body (11) made of a rubber material to eliminate folds from both ends. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bag body used when radially expanding a hole formed in the ground.

[0002]

[Prior Art]

 The present applicant has proposed Japanese Patent Application No. Sho 62-180007 as one method for compacting soft ground. In this method, as shown in FIG. 3, a hole (2) having a relatively small diameter is excavated in the ground (1) in the first step, and the hole (2) in the second step has a high extensibility. Insert the bag (3). The bag body (3) has a length reaching the bottom of the small-diameter hole (2) and has a flange portion (5) at the upper end which serves as an inlet for the fluid (4). In the third step, the fluid (4) is press-fit into the bag body (3) to expand the bag body (3) to form the enlarged hole (6), so that the periphery of the hole (6) is formed. Press down the ground (1). In the fourth step, the pressure of the fluid (4) is removed, the bag (3) is extracted, and the hole (6) is filled with a filler (7) such as sand or soil mortar to consolidate the ground (1). Or if the filler (7) is a stable liquid, the fifth step is to replace it with concrete to form a pile (8) and improve the ground (1). is there.

The bag body (3) used in the above-mentioned construction method is a water-tight structure, expandable by internal pressure, has a predetermined compressive strength, and is a cloth bag woven with a yarn having low elasticity outside. Are arranged, and the whole is formed of a rubber material into a cylindrical bag shape.

As shown in FIG. 2A, the conventional bag body (3) has a small-diameter flange portion (5) that serves as an inlet for the fluid (4) by squeezing one end of the cylindrical body portion (3a). ) Was connected.

[0005]

[Problems to be solved by the device]

 Various sizes are provided for the cylindrical body portion (3a) of the bag body (3). For example, in the case of 600φmm, the flange portion (5a) is 150φmm, and the diameter of 600φmm is reduced to 150φmm. Therefore, as shown in the enlarged view of FIG. 2B, a large number of pleats (3b) are radially generated. The presence of such pleats (3b) means that the internal pressure of the fluid (4) is When actuated, the pressure is not evenly distributed on the threads of the cloth bag placed outside, causing thread breakage due to localized stress concentration, and the desired pressure resistance and durability cannot be obtained.

[0006]

[Means for Solving the Problems]

 As a means for solving the above problems, the present invention relates to a hole expanding bag body in which a cloth bag woven with a thread having low elasticity is placed outside a bag body made of rubber material.

The warp yarns arranged in the longitudinal direction of the bag body are gathered together in the center of the bag body at both ends of the bag body in a parabolic shape, and the weft threads are spirally woven along the conical shape of the warp thread to form a conical shape. The cloth bag with the formed part is arranged outside the bag body made of a rubber material.

[0008]

[Action]

 There are no creases on both ends of the bag, making it easy to connect with the small diameter flange that serves as the fluid inlet, and it is possible to evenly distribute the fluid pressure to each component thread of the fabric bag, and to prevent thread breakage. It is possible to prevent it and improve the pressure resistance and durability.

[0009]

【Example】

 The present invention will be described below based on the embodiments shown in the drawings.

1A and 1B are a side view and an end view, respectively, of the bag for expanding holes according to the present invention on the side of a fluid inlet, (10) is a cloth bag, and (11) is a cloth bag. Shows a bag made of rubber material, and (12) shows a flange portion that serves as a fluid inlet.

The cloth bag (10) is formed by weaving a warp thread (10a) and a weft thread (10b) into a cylindrical shape having a predetermined diameter, and each warp thread (10a) arranged in the longitudinal direction of the bag body (11). , The both ends of the bag body (11) are gathered in the shape of an umbrella in the central direction, and the weft threads (10b) are spirally woven along the conical shape of the warp threads (10a) to form the conical section (10c). To do. The diameter of the gathering portion of each warp yarn (10a) on the small diameter end side of the conical portion (10c) at one end of the bag body (11) is set to be the same as that of the flange portion (12).

The cloth bag (10) woven as described above is placed on the outside of the cylindrical bag body (11) after the rubber material is vulcanized and molded by the same means as the conventional one. The flange portion (12) may be joined before or after vulcanization molding of the rubber material.

The bag body (11) having the above-mentioned structure is regularly and uniformly arranged without the warps (10a) in the conical portions (10c) at both ends of the cloth bag (10) arranged outside thereof being loose or overlapping. Etc., and the wefts (10b) are regularly woven in a spiral shape along the conical shape of the warp (10a) so that there are no creases, and the warp (10a) is molded with the rubber material in this state, When applied to the construction method of No. 3, the force is evenly distributed to each warp thread (10a) and weft thread (10b) constituting the cloth bag (10) with respect to the fluid pressure supplied into the bag body (11), and the pressure resistance is increased. The property is improved.

[0014]

[Effect of the device]

 According to the present invention, the warp threads in the conical portions at both ends of the cloth bag arranged outside the rubber material are regularly and evenly distributed without sagging or overlapping, and along the conical shape of the warp thread. Since the weft threads are regularly woven in a spiral shape, there is no crease. Therefore, it becomes easy to join with the small diameter flange that serves as the fluid injection port, and the productivity is improved about 5 times. Further, the fluid pressure can be evenly distributed to each constituent yarn of the cloth bag, the yarn breakage is prevented, and the pressure resistance is approximately doubled. Furthermore, we were able to improve the repeated durability of the hole formed in the ground as a bag for expanding holes by about 5 times.

[Brief description of drawings]

FIG. 1A is a side view of a hole expanding bag according to the present invention on a fluid injection port side, and FIG. 1B is an end view thereof.

FIG. 2A is a side view of a conventional bag for expanding holes on a fluid injection port side, and FIG. 2B is an enlarged explanatory view of folds generated at both ends.

FIG. 3 is a process sequence diagram of a method for improving the consolidation of soft ground showing an application example of the hole expanding bag.

[Explanation of symbols]

 10 Fabric bag 10a Warp 10b Weft 10c Conical section 11 Bag 12 Flange section

Claims (1)

[Scope of utility model registration request] 1. A bag body for expanding holes in which a cloth bag woven with a thread having low elasticity is arranged outside a bag body made of a rubber material, wherein each warp thread arranged in the longitudinal direction of the bag body is A fabric bag having a conical portion formed by weaving the wefts in a spiral shape along the conical shape of the warp was arranged outside the bag body made of a rubber material. A bag for expanding holes, which is characterized in that