JP4043399B2 - Hydraulic iron pipe deformation prevention device and hydraulic iron pipe burying method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a concrete buried type hydraulic iron pipe, and more specifically, when a high concrete placing pressure is applied to a thin-walled hydraulic iron pipe, the hydraulic iron pipe deformation preventing device capable of preventing deformation and buckling of the hydraulic iron pipe, and The present invention relates to a method of burying a hydraulic iron pipe.
[0002]
[Prior art]
When constructing a hydroelectric power plant, a conduit for guiding the water stored in the dam to the generator will be buried in the ground. Also, in recent years, after generating electricity during times when power demand is high, the water is stored, and in times when electricity demand is low, surplus power is used to return the generated water to the upper power generation reservoir. Many so-called pumped-storage power generation systems have been built. In any hydroelectric power plant, excavation of a vertical shaft or vertical shaft in the natural ground, a hydraulic iron pipe as a conduit pipe is placed inside these, and concrete is placed between the hydraulic iron pipe and the inclined shaft, etc. Construction to bury iron pipes is required.
[0003]
When casting concrete, a high casting pressure acts on the hydraulic iron pipe. Therefore, in order to prevent deformation and buckling of the hydraulic iron pipe, some means of reinforcement is required for the hydraulic iron pipe when placing concrete. As such a reinforcing means, Patent Document 1 discloses a technique for reinforcing a hydraulic iron pipe by attaching H-shaped steel ring-shaped stiffeners at predetermined intervals in the axial direction of the hydraulic iron pipe.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 8-199547 P1, 2
[0005]
[Problems to be solved by the invention]
By the way, in recent years, in order to reduce the construction cost of the hydraulic iron pipe with the increase in the size of the hydraulic iron pipe, the steel iron pipe is thinned to reduce the manufacturing cost of the hydraulic iron pipe itself or reduce the thickness. As a result, the installation cost can be reduced by reducing the weight. In addition, the hydraulic iron pipe embedding process is shortened by increasing the length of the hydraulic iron pipe that can be embedded in one concrete placement and reducing the number of times of concrete placement by increasing the size of the hydraulic iron pipe installation block. ing.
[0006]
FIG. 7 is an explanatory view showing a conventionally used reinforcing means for a hydraulic iron pipe. With the thinning of the hydraulic iron pipe and the increase in the size of the installation block, a situation occurs in which a high casting pressure acts on the thin hydraulic iron pipe. Under such circumstances, in the conventional stiffener structure shown in FIG. 7A, the stiffeners 510 must be arranged closely in the axial direction of the hydraulic iron pipe 501 and the height l of the stiffener 510 must be increased. I must. However, it is difficult to increase the size of the stiffener 510 because the cross section of the inclined shaft or the like in which the hydraulic iron pipe 501 is embedded must be made as small as possible from the viewpoint of reducing the construction cost and shortening the construction period.
[0007]
Further, FIG. 7B shows that, as a means for reinforcing the hydraulic iron pipe 501, a plurality of spiders (struts) 520 are arranged in the hydraulic iron pipe 501 so that the driving pressure P acting on the hydraulic iron pipe 501 is supported by the spider 520. The structure to be shown is shown. With this configuration, there is no problem with reducing the cross section of the inclined shaft or the like in which the hydraulic iron pipe 501 is embedded. However, if the hydraulic iron pipe 501 increases in size, the spider 520 must inevitably increase in size, which may cause the out-of-plane rigidity of the spider 520 to be insufficient and not support the driving pressure P. Therefore, for the large-diameter hydraulic iron pipe 501, it is necessary to increase the number of spiders 520 and increase the out-of-plane rigidity, but this causes an increase in cost and a decrease in workability.
[0008]
Accordingly, the present invention has been made in view of the above, and a hydraulic pressure that can prevent deformation and buckling of the hydraulic iron pipe when a high concrete pouring pressure is applied to a large and thin hydraulic iron pipe. An object of the present invention is to provide an iron pipe deformation prevention device and a method of constructing a hydraulic iron pipe.
[0009]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, a deformation prevention device for a hydraulic iron pipe according to the present invention includes an annular support member having a configuration in which an inner periphery is configured by a curved surface and an outer periphery is combined with a plane, and a plane at the outer periphery of the annular support member And a placement pressure transmitting means disposed so as to contact the portion and the inner wall of the steel pipe and transmitting the concrete placement pressure acting on the hydraulic iron pipe to the annular support member.
[0010]
In this way, the concrete placement pressure acting on the hydraulic iron pipe is supported by transmitting it to the annular support member via the placement pressure transmission member, so that the out-of-plane rigidity of the deformation prevention device for the hydraulic iron pipe is sufficiently ensured. Can do. Accordingly, even when a large-sized, thin-walled hydraulic iron pipe made of high-strength steel is buried and concrete is placed, deformation and buckling of the hydraulic iron pipe can be prevented.
[0011]
Further, in the hydraulic iron pipe deformation preventing apparatus according to the next invention, in the hydraulic iron pipe deformation preventing apparatus, the annular support member is disposed so as to face a plate material parallel to a plane perpendicular to the axial direction, and further perpendicular to the plate material. It is a box structure formed by joining plate members arranged opposite to each other. Thus, by making the annular support member a box structure, the out-of-plane rigidity of the annular support member can be improved while reducing the weight of the annular support member.
[0012]
Further, in the hydraulic iron pipe deformation preventing device according to the next invention, in the hydraulic iron pipe deformation preventing device, the driving pressure transmitting means can be expanded and contracted, and the annular supporting member is extended by extending the driving pressure transmitting means. It fixes in the said hydraulic iron pipe, It is characterized by the above-mentioned. As described above, since the telescopic casting pressure transmission means is used, adjustment when the hydraulic iron pipe deformation preventing device is arranged in the hydraulic iron pipe becomes easy, and workability is improved.
[0013]
Further, the hydraulic iron pipe embedding method according to the next invention is the above-described hydraulic iron pipe embedding method, in which the annular support member and the outer periphery are attached to the hydraulic iron pipe arranged at a predetermined interval with respect to the tunnel inner wall. A step of disposing a deformation prevention device for a hydraulic iron pipe having a telescopic placing pressure transmission member at a predetermined interval with respect to a longitudinal direction of the hydraulic iron pipe; and extending the placement pressure transmission member to form the annular support member. And a step of placing concrete between the tunnel and the hydraulic iron pipe.
[0014]
In this way, the concrete placement pressure acting on the hydraulic iron pipe during concrete placement is supported by transmitting it to the annular support member via the placement pressure transmission member, so that the out-of-plane rigidity of the deformation prevention device for the hydraulic iron pipe is sufficient. Can be secured. Thereby, even when a large-sized, thin-walled hydraulic iron pipe made of high-strength steel is buried and concrete is placed, deformation and buckling of the hydraulic iron pipe can be prevented and the hydraulic iron pipe can be reliably buried in the tunnel.
[0015]
Further, the hydraulic iron pipe burying method according to the next invention is characterized in that, in the hydraulic iron pipe burying method, the predetermined interval in which the deformation prevention device for the hydraulic iron pipe is arranged increases from the lower part to the upper part of the hydraulic iron pipe. And Thus, since the arrangement interval of the deformation prevention devices for the hydraulic iron pipes is increased as the concrete pouring pressure decreases, a necessary and sufficient number of deformation prevention devices for the hydraulic iron pipes can be arranged. As a result, there is no need to prepare an extra deformation prevention device for the hydraulic iron pipe, so that the construction cost can be reduced and the construction time can be shortened.
[0016]
The hydraulic iron pipe burying method according to the next invention is characterized in that, in the hydraulic iron pipe burying method, the central portion of the annular support member is a moving space in the hydraulic iron pipe. In this way, by utilizing the space in the center of the annular support member that constitutes the deformation prevention device for the hydraulic iron pipe, the operator can freely travel within the hydraulic iron pipe, and the equipment can be easily carried in and out. The workability is improved.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or that are substantially the same.
[0018]
(Embodiment 1)
1 is a front view showing a deformation prevention device for a hydraulic iron pipe according to Embodiment 1 of the present invention. The deformation prevention device 10 for a hydraulic iron pipe has a configuration in which a driving pressure transmission means is disposed outside an annular support member 20, and these are arranged in the hydraulic iron pipe 1 so that the annular support member 20 has a driving pressure transmission means. It is characterized in that the hydraulic iron pipe 1 is supported from the inner wall 1iw side.
[0019]
As shown in FIG. 1, the hydraulic iron pipe deformation preventing device 10 has jacks 30 and 30 ′ serving as driving pressure transmitting means disposed at a predetermined interval on the outer periphery of an annular support member 20. The first support portion 30 a of the jack 30 is in contact with the inner wall 1 iw of the hydraulic iron pipe 1, and the second support portion 30 b of the jack 30 is in contact with the outer peripheral plane portion 20 op of the annular support member 20. When the concrete is placed by extending the cylinder 30s such as the jack 30, the annular support member 20 supports the hydraulic iron pipe 1 from the inner wall 1iw via the jack 30, and the hydraulic iron pipe by the concrete placing pressure is provided. 1 deformation and buckling are prevented. In addition, this hydraulic iron pipe 1 is manufactured with high-tensile steel (HT100), and the diameter is about 4-5 m. Moreover, the thickness of the hydraulic iron pipe 1 is about 20-30 mm.
[0020]
Next, the structure of the annular support member 20 constituting the deformation prevention device 10 for a hydraulic iron pipe according to Embodiment 1 of the present invention will be described in detail. FIG. 2 is a front view showing the overall configuration of the annular support member according to Embodiment 1 of the present invention. FIG. 3 is a partial explanatory view showing a detailed configuration of the annular support member according to the first embodiment of the present invention. The annular support member 20 has a circular cross-sectional shape perpendicular to the axis Z (axis perpendicular to the drawing) and a polygonal outer shape perpendicular to the axis Z. That is, the inner periphery of the annular support member 20 is a curved surface and the outer periphery is a combination of a plurality of flat surfaces. Note that the number of flat surfaces constituting the outer periphery of the annular support member 20 is preferably equal to the number of jacks 30 or the like attached to the outer periphery of the annular plate member 20.
[0021]
The fact that the outer shape of the cross section perpendicular to the axis Z is a polygon makes it easy to attach the second support portion 30b of the jack 30 that is the casting pressure transmission means, and moreover, the casting pressure at the time of casting concrete is efficiently reduced. This is for transmission to the annular support member 20. In the first embodiment, the outer cross-sectional shape perpendicular to the axis Z is a hexagon, but the outer cross-sectional shape can be appropriately changed depending on the number of jacks 30 and 30 ′. The number of jacks 30 and the like is 6 to 32, although it is changed depending on the driving pressure acting on the hydraulic iron pipe 1. Therefore, the outer cross-sectional shape perpendicular to the axis Z of the annular support member 20 is a 6-32 square.
[0022]
Since the annular support member 20 is different in the shape in cross section perpendicular to the axis Z and the shape in cross section outside, the radial height H (FIG. 3A) of the annular support member 20 varies depending on the position. Therefore, the radial height H is set to a size that can withstand the driving pressure. As shown in FIG.3 (b), the cyclic | annular support member 20 which concerns on this Embodiment is a box structure manufactured by joining a some board | plate material by welding. As shown in FIG. 3 (c), in this box structure, the end surface 24t of the first side plate 24 parallel to the plane perpendicular to the axis Z is the end of the second side plate 25 combined vertically with the side plate 24. It welds so that it may contact | abut with the part side surface 25ts. With such a structure, the bending moment acting on the first side plate 24 can be suppressed, so that the driving pressure transmitted from the second side plate 25 can be reliably supported. In addition, the box structure can improve the out-of-plane rigidity of the annular support member 20 while reducing the weight of the annular support member 20.
[0023]
As shown in FIGS. 2 and 3A, 3B, a plurality of ribs 22 are attached to the inside of the annular support member 20 in the circumferential direction. The rib 22 is disposed at a position where the second support portion 30b of the jack 30 is attached. Thereby, the strength of the annular support member 20 at the attachment position of the jack 30 is improved, and the annular support member 20 is prevented from being deformed by the driving pressure transmitted from the jack 30.
[0024]
The annular support member 20 may be manufactured as a single unit, but when the size is increased, it is preferable that the annular support member 20 is divided and manufactured as shown in FIG. As shown in FIG. 1, a first annular member 20 _first semi-circular and the second annular member 20 _2, and by a bolt which is the fastening means of the flange 26 attached to each end, the annular support member 20 is manufactured. With such a divided structure, even the annular support member 20 having a large size can be easily manufactured. Moreover, if it is set as a division | segmentation structure, since it divides and conveys and the annular support member 20 can also be assembled in the construction site of the hydraulic iron pipe 1, the freedom degree of transport will also improve. In particular, the construction site of the hydraulic iron pipe 1 is many in the mountains, and the transportation network may not be sufficiently prepared. Therefore, the divided structure is effective for the construction of the hydraulic iron pipe 1.
[0025]
Next, the placement pressure transmission means will be described with reference to FIG. In the first embodiment, a plurality of jacks 30 and 30 'are used as the driving pressure transmission means. The jack 30 and the like are attached by fixing the second support portion 30b to the outer peripheral flat surface portion 20op of the annular support member 20, as shown in FIG. The first support portion 30a such as the jack 30 contacts the inner wall 1iw of the hydraulic iron pipe 1, but the contact portion shape of the second support portion 30b is the inner wall shape of the hydraulic iron pipe 1 as shown in FIG. It is preferable to have a shape that matches the radius of curvature R. In this way, the driving pressure can be efficiently transmitted to the jack 30 or the like. The number of jacks 30 serving as the driving pressure transmission means is determined in consideration of safety against buckling and deformation of the hydraulic iron pipe 1. Moreover, since the jack 30 etc. can be expanded-contracted, the adjustment at the time of arrange | positioning the deformation | transformation prevention apparatus 10 of a hydraulic iron pipe in the hydraulic iron pipe 1 becomes easy. As a result, workability is improved and the construction period is shortened.
[0026]
In the first embodiment, the jack 30 is a mixture of a manually driven jack 30 and an electrically driven automatic jack 30 ′. If it does in this way, the deformation prevention apparatus 10 of a hydraulic iron pipe can be installed comparatively easily, suppressing the manufacturing cost of the deformation prevention apparatus 10 of a hydraulic iron pipe. On the other hand, if the electric drive type jack 30 is used, the work of installing the deformation prevention device 10 for the hydraulic iron pipe in the hydraulic iron pipe 1 becomes easy. The automatic drive jack 30 'is not limited to the electric drive type, and may be a hydraulic or pneumatic jack.
[0027]
FIG. 4 is a conceptual diagram for explaining the concrete placing pressure acting on the hydraulic iron pipe when concrete is placed on the hydraulic iron pipe arranged in the inclined shaft. As shown in FIG. 4, when the hydraulic iron pipe 1 disposed in the inclined shaft 3 is embedded in the inclined shaft 3, concrete 5 is placed between the hydraulic iron pipe 1 and the inclined shaft 3. At this time, for the same reason that the water pressure increases as the water depth increases, the driving pressure P acting on the hydraulic iron pipe 1 increases as the height h approaches zero.
[0028]
In general, since concrete has low fluidity, a hydraulic pouring pressure P smaller than the unit volume mass of the concrete acts on the hydraulic iron pipe 1. However, in concrete with extremely high fluidity such as concrete, it is treated that the hydraulic pressure P due to the unit volume mass of the concrete acts on the hydraulic iron pipe 1. In this way, when placing concrete, a larger placement pressure P acts on the hydraulic iron pipe 1 than when placing normal concrete, so that deformation and buckling of the hydraulic iron pipe 1 is prevented. Therefore, stronger reinforcement is required than when ordinary concrete is placed.
[0029]
Here, the concrete is a concrete having a significantly improved fluidity without impairing the material separation resistance during freshness, and the fluidity has a slab flow value at the time of unloading of 50 cm or more and 70 cm or less. The slam flow is determined by JIS A 1101 (concrete slab test method). When concrete is used, there are advantages that poorly filled portions are less likely to be produced, a homogeneous and highly accurate structure can be obtained, and the placing work can be rationalized.
[0030]
This hydraulic iron pipe deformation preventing device 10 has jacks 30 and 30 ′, which are driving pressure transmission means, arranged outside an annular support member 20, and the annular support member 20 attaches the hydraulic iron pipe 1 to its inner wall via the jack 30 or the like. Support from the side. Thus, since the hydraulic iron pipe 1 is supported by the annular support member 20, even when the thin hydraulic steel pipe 1 is buried and concrete is placed, the out-of-plane rigidity of the deformation prevention device 10 for the hydraulic iron pipe is sufficiently increased. The deformation and buckling of the hydraulic iron pipe 1 can be prevented.
[0031]
Further, when a hydraulic iron pipe having a large diameter is supported by the conventional spider method (FIG. 7B), the dimensions of the spider 520 are increased, and the out-of-plane rigidity is relatively lowered. In order to eliminate this, it is necessary to increase the thickness of the spider 520 or increase the number of the spiders 520, which reduces workability. According to this deformation prevention device 10 for a hydraulic iron pipe, the hydraulic iron pipe 1 is supported by the annular support member 20 having a sufficiently large out-of-plane rigidity, so that deformation and buckling of the hydraulic iron pipe 1 can be prevented.
[0032]
Furthermore, when placing concrete, a hydraulic pressure with a casting height of 100% acts on the hydraulic iron pipe 1, so that a higher casting pressure than normal concrete acts on the hydraulic iron pipe 1. In this case, the out-of-plane rigidity of the hydraulic iron pipe deformation prevention device 10 can be sufficiently secured, so that deformation and buckling of the hydraulic iron pipe 1 can be prevented. Thereby, since the block which lays concrete per time can be enlarged, the construction period at the time of embedding a large sized thin-walled hydraulic iron pipe can be shortened.
[0033]
Further, since the deformation prevention device 10 for the hydraulic iron pipe is disposed inside the hydraulic iron pipe 1, it does not become larger than the diameter of the hydraulic iron pipe 1. Thereby, even when the cross section of the tunnel which embeds the hydraulic iron pipe 1 is small, construction becomes possible. In addition, since the annular support member 20 is used, the central portion of the hollow portion 20i can be used as a work space for operating a passage for an operator, equipment, etc., the jack 30, etc., and the work efficiency is improved.
[0034]
(Embodiment 2)
In the second embodiment of the present invention, a method of embedding the hydraulic iron pipe 1 in the tunnel using the hydraulic iron pipe deformation preventing apparatus 10 according to the first embodiment of the present invention will be described. In this example, the hydraulic iron pipe 1 is embedded in the inclined shaft 3 that is a tunnel, but the above-described apparatus 10 for preventing deformation of the hydraulic iron pipe can also be applied to the case where the hydraulic iron pipe 1 is embedded in the vertical shaft.
[0035]
FIG. 5 is a cross-sectional view showing a state in which the deformation prevention device for a hydraulic iron pipe according to the present invention is arranged in a hydraulic iron pipe in a tilt shaft. The hydraulic iron pipe 1 used for the pumping-type power generation is generally installed in a tilt shaft 3 dug in a natural ground, and concrete 5 is placed between the tilt shaft 3 and the hydraulic iron pipe 1 and buried in the tilt shaft 3. When placing the concrete 5 on the outside of the hydraulic iron pipe 1 installed in the inclined shaft 3, in consideration of workability, the entire placement area of the concrete 5 is divided into a plurality of blocks, and the concrete is put into each block. 5 is cast. For this reason, a plurality of hydraulic iron pipe deformation preventing devices 10 are arranged at predetermined intervals D _{1 to} D ₅ in one block. Note that D ₁ + D ₂ +... + D ₅ = “length of one block”.
[0036]
As described above, the placement pressure acting on the hydraulic iron pipe 1 is smaller in the upper part than in the lower part of the hydraulic iron pipe 1, so that the deformation of the hydraulic iron pipe is prevented in the lower part of the hydraulic iron pipe 1, as shown in FIG. The apparatus 10 is arranged densely, and the deformation prevention apparatus 10 for the hydraulic iron pipe is arranged sparsely as it goes upward. The distances D _{1 to} D ₅ are determined so as not to cause deformation or buckling of the hydraulic iron pipe 1 using structural analysis such as a finite element method.
[0037]
Penstock 1 more deformation prevention device penstock located within 10 in the predetermined distance D ₁ to D _5, is coupled by the upper wire 50 and lower wire 52, respectively. Thus, when the concrete placement for one block is completed, the plurality of hydraulic iron pipe deformation prevention devices 10 are pulled up to the next block while maintaining the distances D _{1 to} D ₅ , and these are moved to the placement region. Since it can fix, work efficiency improves.
[0038]
FIG. 6 is an explanatory view showing an embodiment for disposing the deformation prevention device for a hydraulic iron pipe according to the present invention in the hydraulic iron pipe in the inclined shaft. As described above, the diagonal member 44 and the base material 46 support the deformation prevention apparatus 10 for the hydraulic iron pipe, and the stage 40 is attached to the diagonal material 44 and the base material 46. The stage 40 is used for an operator to operate the manual jack 30 (see FIG. 1) and adjust the arrangement position of the deformation prevention device 10 for the hydraulic iron pipe.
[0039]
Further, a passage hole 42 is opened in the stage 40, and an operator moves through the shaft hole 3 (see FIG. 5) through the passage hole 42. A ladder staircase 56 passes through the passage hole 42 and the annular support member 20 to facilitate the movement of the operator. Thus, since the deformation prevention device 10 for a hydraulic iron pipe according to the present invention uses the annular support member 20, an operator and equipment can move in the inclined shaft 3 using the hollow portion 20i (see FIGS. 1 and 2). Therefore, the construction efficiency can be made extremely high.
[0040]
When the deformation prevention device 10 for the hydraulic iron pipe is disposed at a predetermined position in the hydraulic iron pipe 1, the cylinder 30s of the jack 30 is extended (see FIG. 1B), and the annular support member 20 is inserted into the hydraulic iron pipe 1 via the jack 30. And fix. Thereafter, one block of concrete 5 is placed between the inclined shaft 3 and the hydraulic iron pipe 1, and the embedding of the hydraulic iron pipe 1 in this block is completed. When the concrete 5 is solidified until it reaches a practically sufficient strength, the hydraulic iron pipe deformation preventing device 10 is collectively pulled up to the next block, and the hydraulic iron pipe deformation preventing device 10 is similarly fixed, and the concrete 5 is placed. . This operation is sequentially repeated to bury the hydraulic iron pipe 1 over the entire inclined shaft 3.
[0041]
【The invention's effect】
As described above, in the hydraulic iron pipe deformation preventing device according to the present invention, the concrete placing pressure acting on the hydraulic iron pipe is supported by being transmitted to the annular support member via the placing pressure transmitting member. Accordingly, even when a large-sized, thin-walled hydraulic iron pipe made of high-strength steel is buried and concrete is placed, deformation and buckling of the hydraulic iron pipe can be prevented.
[0042]
Further, in the hydraulic iron pipe deformation preventing device according to the next invention, since the annular support member has a box structure, it is possible to improve the out-of-plane rigidity of the annular support member while achieving weight reduction of the annular support member.
[0043]
Further, in the hydraulic iron pipe deformation preventing device according to the next invention, since the casting pressure transmission means can be expanded and contracted, adjustment when placing the hydraulic iron pipe deformation preventing device in the hydraulic iron pipe becomes easy, and workability is improved. Will improve.
[0044]
Further, in the method for burying a hydraulic iron pipe according to the next invention, the concrete placement pressure acting on the hydraulic iron pipe is supported by transmitting it to the annular support member via the placement pressure transmission member. Thereby, even when a large-sized, thin-walled hydraulic iron pipe made of high-strength steel is buried and concrete is placed, deformation and buckling of the hydraulic iron pipe can be prevented and the hydraulic iron pipe can be reliably buried in the tunnel.
[0045]
Further, in the method of burying a hydraulic iron pipe according to the next invention, the arrangement interval of the deformation prevention device for the hydraulic iron pipe is increased as the concrete pouring pressure decreases. This eliminates the need to prepare an extra hydraulic iron pipe deformation prevention device, thus reducing construction costs and shortening construction time.
[0046]
Further, in the method for burying a hydraulic iron pipe according to the next invention, the space in the central portion of the annular support member constituting the deformation prevention device for the hydraulic iron pipe is used as a moving space. Thereby, when the hydraulic iron pipe is buried, the operator can freely come and go in the hydraulic iron pipe, and the equipment can be easily carried in and out, so that the workability is improved.
[Brief description of the drawings]
FIG. 1 is a front view showing a deformation prevention apparatus for a hydraulic iron pipe according to Embodiment 1 of the present invention.
FIG. 2 is a front view showing an overall configuration of an annular support member according to Embodiment 1 of the present invention.
FIG. 3 is a partial explanatory view showing a detailed configuration of the annular support member according to the first embodiment of the present invention.
FIG. 4 is a conceptual diagram for explaining concrete placing pressure acting on a hydraulic iron pipe when concrete is placed on a hydraulic iron pipe arranged in a tilt shaft.
FIG. 5 is a cross-sectional view showing a state in which the apparatus for preventing deformation of a hydraulic iron pipe according to the present invention is arranged in a hydraulic iron pipe in a tilt shaft.
FIG. 6 is an explanatory view showing an embodiment for arranging the deformation preventing device for a hydraulic iron pipe according to the present invention in a hydraulic iron pipe in a tilt shaft.
FIG. 7 is an explanatory view showing a reinforcing means for a hydraulic iron pipe that has been conventionally used.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,501 Hydraulic iron pipe 10 Hydraulic iron pipe deformation | transformation prevention apparatus 20 Annular support member 20i Hollow part 20op Outer peripheral plane part 24, 25 Side plate 24t End surface 25ts End part side surface 30, 30 'Jack 30a First support part 30b Second support part 510 Stiffener 520 spider

Claims (6)

An annular support member having a configuration in which the inner periphery is configured by a curved surface and the outer periphery is configured by combining planes;
A placement pressure transmitting means that is disposed so as to be in contact with the flat portion of the outer periphery of the annular support member and the inner wall of the steel pipe, and transmits a concrete placement pressure acting on the hydraulic iron pipe to the annular support member;
An apparatus for preventing deformation of a hydraulic iron pipe, comprising: The annular support member has a box structure in which plate members parallel to a plane perpendicular to the axial direction are arranged opposite to each other, and a plate member arranged perpendicularly to the plate members is joined. The deformation prevention apparatus for a hydraulic iron pipe according to 1. 3. The hydraulic iron pipe according to claim 1, wherein the driving pressure transmission means is extendable, and the annular support member is fixed in the hydraulic iron pipe by extending the driving pressure transmission means. 4. Deformation prevention device. An apparatus for preventing deformation of a hydraulic iron pipe having an annular support member and an extendable driving pressure transmission member attached to the outer periphery thereof in a hydraulic iron pipe arranged at a certain interval with respect to the inner wall of the tunnel, A step of arranging at a predetermined interval with respect to the longitudinal direction of the iron pipe;
Extending the driving pressure transmission member and fixing the annular support member in the hydraulic iron pipe;
Placing concrete between the tunnel and the hydraulic iron pipe;
A method for burying a hydraulic iron pipe characterized by comprising: The method for embedding a hydraulic iron pipe according to claim 4, wherein the predetermined interval in which the deformation prevention device for the hydraulic iron pipe is arranged increases from the lower part to the upper part of the hydraulic iron pipe. The method for embedding a hydraulic iron pipe according to claim 4 or 5, wherein a central portion of the annular support member is a moving space in the hydraulic iron pipe.

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