JP4481134B2 - Civil engineering bag - Google Patents

Description

  The present invention relates to a civil engineering bag body that is used in civil engineering work and in which an end of a cylindrical fabric is closed and an injection material is injected therein.

  Conventionally, in many various civil works such as a preload shell method, a bag body (a civil engineering bag body) formed by joining and closing ends of a tubular woven fabric by sewing or the like is often used. This civil engineering bag body is used in accordance with various uses in various civil engineering work by injecting an injection material such as concrete, mortar, cement milk or the like into the inside thereof. As such a civil engineering bag, for example, a civil engineering bag used in the preload shell method described in Patent Document 1 is known. This civil engineering bag has a large-diameter portion woven without a seam and small-diameter portions at both ends thereof, and is sewn with a uniform seam that crosses in the width direction of the bag. The small diameter part of the part is closed.

JP 2001-295598 A (page 4, FIG. 1-2)

  In a conventional civil engineering bag, like the civil engineering bag described in Patent Document 1, both end portions are joined and closed by stitching at seams that cross in the width direction of the bag. When an injection material is injected into such a civil engineering bag body, the pressure caused by the injection also acts on the end portion closed by stitching. Even if the injection pressure is much lower than the breaking pressure of the base fabric constituting the bag body, the seam closing the ends is loosened, or the sewing thread constituting the seam May be cut off. That is, it is difficult to ensure sufficient breaking strength of the bag body due to the low pressure resistance of the joint portion that is closed by joining the end portions of the bag body.

  In view of the above circumstances, the present invention relates to a civil engineering bag body in which an end portion of a tubular fabric is closed and an injection material is injected therein, and the joint portion of the bag body end portion at the time of injection of the injection material An object of the present invention is to provide a civil engineering bag that can improve pressure resistance.

Means and effects for solving the problems

The civil engineering bag according to the present invention is used in civil engineering work, and relates to a bag in which an end of a tubular woven fabric is closed and an injection material is injected therein.
And the civil engineering bag body by this invention has the following some features, in order to achieve the said objective, and is equipped with the following features independently or in combination suitably.

In order to achieve the above object, the first feature of the civil engineering bag of the present invention is that the two ends overlap in the state of a double tube in which one end of a tubular fabric having both ends formed with openings is folded inward. A first joint part that is joined together in the circumferential direction and closed, and the both end parts are joined at the first joint part, whereby the inner part of the tubular fabric is folded between the outer part and the outer surface part. The edge portions at the opposite positions of the formed annular space into which the injection material is injected and the openings formed at the both end portions joined in the circumferential direction by the first joint portion are joined to each other. by forming a second junction Ru closed further aligning said opening is that it is provided with.

  According to this configuration, the injection material is injected into the annular space formed between the folded portion and the surface portion, and the both ends overlapping at the first joint portion are closed, thereby preventing the injection material from leaking. It is done. Further, a second joint portion is formed by closing the opening formed at the end portion closed by the first joint portion so as to form a ridge. For this reason, in the edge part in which a 2nd junction part is formed, the average curvature radius in the curved part formed in an edge part can be made small by closing a bag body edge part (average curvature). Can be increased). And the stress which arises in each curved part formed in an edge part can be reduced by providing a collar. Thereby, it can suppress that the breakage | rupture of a bag body will generate | occur | produce from the junction part of an edge part with a pressure smaller than the injection pressure of an injection material reaches the fracture | rupture pressure of the base fabric which comprises a bag body. Accordingly, it is possible to improve the pressure resistance of the joint portion of the bag body end when the injection material is injected.

  The second feature of the civil engineering bag according to the present invention is that the first joint portion is formed by joining the two end portions that overlap each other by sewing.

  According to this structure, the 1st junction part which joins the overlapping both ends can be easily formed by sewing.

  A third feature of the civil engineering bag according to the present invention is that the ridges are formed radially toward the radial direction of the tubular fabric.

  According to this configuration, it is possible to easily realize an end portion structure that expands in a uniform shape during pressurization and does not cause blistering.

  The fourth feature of the civil engineering bag according to the present invention is that the ridges are formed radially so as to be at least one of a point-symmetrical arrangement and a line-object arrangement.

  According to this structure, since it forms radially, each curvature radius in the curved part formed in a bag body end part can be made small so that it may become substantially equal, and the curvature radius which becomes irregularly large will occur. Can be prevented.

  The fifth feature of the civil engineering bag of the present invention is that the opening is closed so that the opening remains in the center even after the ridge is formed.

  According to this configuration, since the opening remains after the ridge is formed at the end, a through space is formed inside the folded portion. For this reason, this civil engineering bag body can be used so that various members, such as a pipe, may be inserted using this penetration space. Moreover, when dehydrating an injection material using this civil engineering bag body, it can also drain to this penetration space via a folding | returning part, and can improve drainage.

  The sixth feature of the civil engineering bag according to the present invention is that the bag is further provided with a restraining member that is provided on the heel that is radially formed and restrains the opening of the heel.

  According to this configuration, since the opening of the bag is restrained by the restraining member, it is possible to further improve the pressure resistance of the joint portion that joins the end portions of the bag body at the time of injecting the injection material.

  A seventh feature of the civil engineering bag of the present invention is that the restraining member is a plurality of bolts and nuts attached so as to close a plurality of pairs of edge portions forming the flange.

  According to this configuration, it is possible to more firmly restrain the plurality of pairs of edge portions that form the flange by simply attaching the bolts and nuts so that the restraining member can be realized with a simple configuration.

  An eighth feature of the civil engineering bag according to the present invention is that the restraining member is a connecting belt provided so as to connect the space between adjacent ribs.

  According to this structure, it can restrain more firmly so that a wrinkle may not open only by connecting the part between ribs with a connection belt, and a restraint member is realizable with a simple structure.

  A ninth feature of the civil engineering bag according to the present invention is that the intercostal portion is sewn in a state of being overlapped with both end portions of the connecting belt.

  According to this configuration, the intercostal portion and the both end portions of the connecting belt are stitched together in an overlapped state. For this reason, when the injection pressure of the injection material acts on the end portion of the bag body where the joint portion is formed, for the sewing thread that is sewn between the intercostal portion and the connecting belt, A force does not act in the direction of opening the seam, and a force acts in the shear direction. Therefore, the pressure resistance at the stitched portion between the intercostal portion and the connecting belt can be improved.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. The bag body according to the embodiment of the present invention is a civil engineering bag body used in civil engineering work, and can be widely applied in various civil engineering work using a bag body into which an injection material is injected. For example, it can be used in many various civil works such as a preload shell method. In addition, various injection materials, such as concrete, mortar, cement milk, and grout, can be widely used as the injection material injected into the civil engineering bag of the present embodiment.

  Moreover, the civil engineering bag body of this embodiment is comprised as a bag body by joining and closing the edge part of a cylindrical textile fabric. FIG. 1 is a perspective view illustrating a seamless tubular fabric 1 (hereinafter referred to as a tubular fabric 1). The tubular fabric 1 shown in FIG. 1 is woven so that the body portion 2 extends with the same diameter, and both ends 3 having openings are provided at both ends. As will be described later, the civil engineering bag of the present embodiment is configured by joining and closing the cylindrical fabric 1 by stitching. In addition, this embodiment is applicable also to the cylindrical fabric which is not woven so that it may remain with the same diameter. For example, the present embodiment can be applied to various tubular fabrics such as different diameter tubular fabrics woven so that the body portion has a large diameter and both ends have a small diameter. Further, the present embodiment can be applied even if it is not a seamless tubular woven fabric. For example, it can be applied to a tubular woven fabric formed by stitching in a state in which edge portions on both sides of a single fabric are overlapped. can do.

  FIG. 2 is a perspective view of the civil engineering bag body 11 (hereinafter also referred to as the bag body 11) according to the present embodiment, and FIG. 3 is a perspective view showing the bag body 11 in the middle of manufacturing. 4 shows a cross-sectional view (vertical cross-sectional view) taken along the line AA in FIG. As shown in FIG. 2, the bag body 11 is formed in a substantially cylindrical shape, and includes a body portion 21 and end portions 22 and 23 at both ends thereof. The one end portion 22 is formed with a first joint portion 24 and a second joint portion 25 which will be described later, and the other end portion 23 has a structure in which no joint portion is formed. In addition, the other edge part 23 will be formed in the bending part at the time of folding the cylindrical textiles 1 in half so that it may become a double cylinder.

  In the manufacture of the bag body 11, as shown in FIGS. 3 and 4, first, one end 3 of the tubular fabric 1 is formed so that the tubular fabric 1 shown in FIG. Fold inward and align both ends. Then, in this state, the overlapping end portions 3 are joined together at the first joining portion 24 and closed. The first joining portion 24 is joined and closed by sewing the overlapping end portions 3 so as to make one round in the circumferential direction. In addition, the annular space 28 is formed between the inner folded portion 26 and the outer surface portion 27 by joining the both end portions 3 at the first joint portion 24 (see FIG. 4). ). An injection port (not shown) for injecting the injection material is appropriately attached to a predetermined portion of the surface portion 27, and the injection material is injected into the annular space 28 through the injection port.

  FIG. 5 is a view of the bag body 11 of FIG. 2 as viewed from above. As shown in FIG. 2 and FIG. 5, the second joint portion 25 formed on one end portion 22 includes a plurality of pairs of edge portions 29 by pinching the two end portions 3 joined by the first joint portion 24. These are joined together in a closed state so as to form four (three or more) ridges (gathers) 30. The plurality of pairs of edge portions 29 are also joined by stitching similarly to the first joint portion 24. The four ridges 30 provided by forming the second joint portion 25 are radially arranged so as to be point-symmetric and line-symmetric. Moreover, the opening part 31 is formed in the gathering part where the four collars 30 arrange | positioned radially are gathered, and it is in the open state.

  FIG. 6 is a perspective view showing a state in which the bag 11 shown in FIG. 2 is folded in the longitudinal direction. In addition, this FIG. 6 has shown the state which the bag body 11 folded with the edge part 22 in which the 1st and 2nd junction part (24, 25) was provided upwards. Further, the bag body 11 is provided with an injection port 32 for injecting the injection material into the inner annular space 28, and the injection material is injected through a pump, a hose, etc. (not shown) through the injection port 32. Will be. When the injection material is injected, the bag body 11 expands so as to extend in the longitudinal direction (in the direction of the arrow in the figure).

  According to the civil engineering bag 11 described above, the injection material is injected into the annular space 28 formed between the folded portion 26 and the surface portion 27, and the overlapping end portions 3 are closed at the first joint portion 24. As a result, the injection material can be prevented from leaking. Furthermore, a second joint portion 25 is formed by closing the opening 31 formed at the end portion 22 closed by the first joint portion 24 so as to form four flanges 30. For this reason, in the edge part 22 in which the 2nd junction part 25 is formed, the average curvature radius in the curved part 33 (refer FIG. 5) formed in the edge part 22 is made small by closing a bag body edge part. Since the average curvature can be increased, it is possible to reduce the stress generated in each curved portion 33 when the injection material is injected. Thereby, the breakage of the bag body 11 occurs from the joint portions (24, 25) that join the end portions 22 with a pressure smaller than the injection pressure of the injection material reaches the breakage pressure of the base fabric constituting the bag body 11. Can be suppressed. Accordingly, it is possible to improve the pressure resistance of the joint portion of the bag body end when the injection material is injected.

  When three or more ridges are not formed on the end portion 22 of the bag body 11, that is, when only the first joint portion 24 for simply closing the both end portions 3 of the bag body 11 is provided, The radius of curvature of the curved portion formed at the end 22 is a large radius depending on the diameter of the bag body 11. However, by forming the three or more ridges 30 on the end portion 22 of the bag body 11, the radius of curvature of the curved portion 33 formed on the end portion 22 of the bag body 11 can be reduced, and the joint portion is provided. The stress acting on the end 22 can be reduced. In general, the stress generated in the curved portion formed at the end of the bag can be considered in the same manner as the axial and circumferential stress generated in the thin cylinder. That is, it can be considered that the stress generated in the bending portion is approximately proportional to the curvature radius of the bending portion and the internal pressure acting on the bending portion. Therefore, the stress which arises in an edge part can be reduced by providing three or more ridges in an edge part, and making the curvature radius of each curved part small.

  Further, according to the civil engineering bag 11, the four ridges 30 arranged radially are formed so as to have a point-symmetrical arrangement and a line-symmetrical arrangement. It can be made small so as to equalize, and it is possible to prevent the occurrence of a part having a large curvature radius.

  Further, according to the civil engineering bag 11, the opening 31 remains even after the end 30 is formed with the flange 30, so that a through space is formed inside the folded portion 26. For this reason, this civil engineering bag 11 can be used so that various members, such as a pipe, may be inserted using this penetration space. Moreover, when dehydrating an injection material using this civil engineering bag body 11, it can also drain to this penetration space via the folding | returning part 26, and can improve drainage.

  In the civil engineering bag body 11 described above, in order to make it difficult to open the four ridges 30 arranged radially, a restraining member that restrains the opening of the ridge 30 can be further provided.

  FIG. 7 is a view exemplifying a case where a plurality of bolts 34 and nuts 35 that are attached so as to close the openings 31 of the plurality of pairs of edge portions 29 are provided as the above-described restraining members. It is shown as a corresponding figure. In this way, the bolts 34 and the nuts 35 can be further firmly restrained so that the plurality of pairs of edge portions 29 are not opened only by a simple configuration in which the bolts 34 and the nuts 35 are attached to locations close to the openings 31. Moreover, FIG. 8 illustrates the case where the constraining member is provided with a gap portion 36 between the adjacent ribs 30 and 30 and a connecting belt 37 for connecting those located at opposite positions. FIG. 8 is also shown as a diagram corresponding to FIG. In addition, in FIG. 8, the case where the both ends of the connection belt 37 are connected by sewing with the intercostal space portion 36 is illustrated. In this way, it is possible to further firmly restrain the collar 30 so that the collar 30 does not open with only a simple configuration in which the gap portions 36 facing each other are coupled by the coupling belt 37. Therefore, as shown in FIG. 7 and FIG. 8, by further providing a restraining member, the movement in the direction in which the collar 30 opens is restrained, and joining that joins the end portion 22 of the bag 11 at the time of injecting the injecting material. The pressure resistance of the part can be further improved.

  As shown in FIG. 8, the pair of intercostal portions 36 and 36 and both end portions of the connecting belt 37 are stitched together by a stitching portion 38 in a state of being overlapped. For this reason, when the injection pressure of the injection material acts on the end portion 22 of the bag body 11 where the joint portion is formed, the stitching portion 38 that stitches between the intercostal portion 36 and the connecting belt 37. For this sewing thread, force does not act in the direction of opening the seam, but force acts in the shearing direction. Accordingly, the pressure resistance at the stitched portion between the intercostal portion 36 and the connecting belt 37 can be improved.

Hereinafter, an example in which the above-described civil engineering bag body 11 is used for civil engineering work will be described.
First, the case where the bag body 11 is used for ground improvement is demonstrated, referring FIG.9 and FIG.10. For example, as shown in FIG. 9, the civil engineering bag 11 and the injection pipe connected to the injection port 32 of the civil engineering bag 11 in the hole 40 formed by excavating the ground 39 shown in the sectional view. 41 is inserted. Next, an injection material such as grout is pressurized and injected into the annular space 28 (see FIG. 4) of the civil engineering bag body 11 through the injection pipe 41 and the injection port 32. By this pressure injection, the bag body 11 expands while extending toward the bottom side of the hole 40. Then, even after the bag body 11 is filled so as to be in close contact with the side wall of the hole 40, by continuing the pressure injection of the grout, as shown in FIG. It expands while compressing the surrounding ground 39. Then, this civil engineering work is completed by stopping grout injection and hardening the grout in the bag 11. Thus, the bag 11 can be used, for example, for ground improvement for compacting the ground.

  FIG. 11 is a diagram for explaining an example in which the civil engineering bag 11 is used for laying a pillar body on the ground, and illustrates a case where a pillar body 42 such as a sign or a column is laid on the ground 43. is there. As shown in FIG. 11 (a), first, a hole 44 is formed by excavating the ground 43, the distal end side of the column body 42 is inserted into the hole 44, and the distal end portion of the column body 42 is formed at the bottom of the hole 44. Place. At this time, the bag body 11 is disposed in the hole 44 in a state where the distal end side of the column body 42 is inserted through the opening 31 of the bag body 11. Next, a self-hardening fluid (injection material) such as mortar is injected into the annular space 28 of the bag 11 through an injection hose (not shown). Thereby, the bag body 11 is in close contact with the hole 44 so as to expand and fill the hole 44. Furthermore, by continuing the pressure injection into the bag 11, excess moisture of the injected self-hardening fluid is discharged to the outside from the surface portion 27 of the bag 11 and the like, and is self-hardening in the annular space 28. The column 42 is firmly held by the bag 11 filled with fluid. Then, a strong solid layer is formed in the bag body 11, and the column body 42 is firmly installed on the ground 43.

  Finally, an example in which the civil engineering bag 11 is used during construction of the glasses tunnel will be described. FIG. 12 is a view showing a tunnel cross section during construction of the glasses tunnel. The two main holes 45 and 46 adjacent to the left and right shown in FIG. 12 are formed by excavation or the like. These main shafts 45 and 46 are not formed by excavating at the same time, but first, an intermediate position between the two main shafts 45 and 46 is excavated to form a cavity portion 47, and the hollow portion 47 is later formed with 2 The middle wall concrete 48 which becomes a common side wall of the two main mines 45 and 46 is formed in the tunnel length direction. Then, the civil engineering bag body 11 is placed on the upper surface of the middle wall concrete 48, and grout is pressurized and injected into the annular space 28 of the bag body 11 to preload the excavation surface, thereby suppressing settlement of the natural ground. Can do.

  Further, in the case of a tunnel cross section as shown in FIG. 12, the main hole 45 having a small cross section is excavated in advance and formed while a support work is being built. The main mine 46 having a large cross section with a slight delay is formed in the same manner. When these main shafts 45 and 46 are formed, support works to prevent loose ground and collapse of the excavation surface are provided at predetermined intervals in the length direction of the main shafts 45 and 46, and the upper surface of the middle wall concrete 48 49, and placed along the excavation surface 50. A large gap 51 for installing a support is required between the middle wall concrete 48 and the excavation surface 50 above the cavity 47 along the length direction of the cavity 47. At the time of construction of such a spectacle tunnel, the bags 11 are installed in order in the gap 51 between the upper surface 49 of the middle wall concrete 48 formed in the cavity 47 and the excavation surface 50. Then, after filling the annular space 28 of the bag 11 with a self-hardening fluid (injecting material) such as grout under pressure, the bag 11 is cured to fill the gap 51 to form a structure.

  While the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made as long as they are described in the claims. For example, the following modifications may be made.

(1) In this embodiment, although the case where the 1st junction part and the 2nd junction part were joined by stitching was explained as an example, it may be joined by joining means other than stitching.

(2) In the present embodiment, the case where the number of ridges formed at the end portion on the side where the joint portion is provided has been described, but the number of ridges may be any number (the number of ridges is 3 or more are desirable). Further, the ridges formed at the end portions do not necessarily have to be arranged radially.

(3) As an example of a restraining member that restrains a plurality of pairs of edge portions in the direction in which the heel opens, a description has been given of what consists of bolts and nuts and what consists of connecting belts. There may be.

(4) The usage form of the civil engineering bag according to the present invention is not limited to those exemplified above, and the civil engineering bag according to the present invention can be widely used in various civil engineering operations.

It is the perspective view which illustrated the seamless tubular fabric. 1 is a perspective view of a civil engineering bag according to an embodiment of the present invention. It is a perspective view which shows the state in the middle of manufacture of the bag for civil engineering shown in FIG. FIG. 4 is a cross-sectional view taken along line AA in FIG. 3. It is the figure which looked at the civil engineering bag shown in FIG. 2 from one end side. It is a perspective view which shows the state which folded the civil engineering bag body shown in FIG. 2 in the longitudinal direction. It is a figure explaining the restraint member applied with respect to the civil engineering bag shown in FIG. It is a figure explaining the restraint member applied with respect to the civil engineering bag shown in FIG. It is explanatory drawing of the example of one Embodiment at the time of construction of the ground improvement using the bag for civil engineering shown in FIG. It is explanatory drawing of the example of one Embodiment at the time of construction of the ground improvement using the bag for civil engineering shown in FIG. It is explanatory drawing of one Example in the column pair laying construction method using the bag for civil engineering shown in FIG. FIG. 3 is a cross-sectional view of a tunnel when a tunnel tunnel is constructed using the civil engineering bag shown in FIG. 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tubular fabric 11 Civil engineering bag body 22 End part 24 1st junction part 25 2nd junction part 26 Folding part 27 Surface part 28 Annular space 29 Multiple pairs of edge parts 30

Claims (9)

A civil engineering bag used in civil engineering work, in which the end of the cylindrical fabric is closed and the injection material is injected into the interior,
In a state of a double cylinder in which one end of a tubular woven fabric having both ends formed in an opening is folded inward, the first joining part that joins and closes the overlapping both end parts in the circumferential direction;
An annular space in which an injection material is injected, which is formed between the folded portion on the inside of the tubular fabric and the outer surface portion by joining the both ends at the first joining portion,
The openings are further closed by joining the edge portions at the opposite positions of the openings formed at the both ends joined in the circumferential direction by the first joints to form ridges. a second joint portion that,
A civil engineering bag, comprising:
  The civil engineering bag according to claim 1, wherein the first joint portion is formed by joining the two end portions that overlap each other by stitching.   The civil engineering bag according to claim 1 or 2, wherein the ridges are radially formed in a radial direction of the tubular fabric.   The civil engineering bag according to claim 3, wherein the ridges are radially formed so as to have at least one of a point-symmetrical arrangement and a line-object arrangement.   The civil engineering bag according to claim 3 or 4, wherein the opening is closed so that the opening remains in the center even after the ridge is formed.   The civil engineering bag according to claim 3 or 4, further comprising a restraining member that is provided on the heel that is radially formed and restrains an opening of the heel.   The civil engineering bag according to claim 6, wherein the restraining member is a plurality of bolts and nuts attached so as to close a plurality of pairs of edge portions forming the flange.   The civil engineering bag according to claim 6, wherein the restraining member is a connecting belt provided so as to connect a portion between adjacent ribs.   The civil engineering bag according to claim 8, wherein the intercostal portion is sewn in a state of being overlapped with both end portions of the connecting belt.

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