JP4220417B2 - Underground cylinder and its burying method - Google Patents

Description

  The present invention is constructed, for example, by inserting and embedding in a natural ground while connecting a plurality of cylinders extending in the tunnel axis direction, such as a preceding support work that is a support work installed prior to tunnel excavation. It is related with the cylinder used for the underground structure to be used, and its embedding method.

In general, in excavation and support when the tunnel pit or the earth covering is thin, it is necessary to form a flat arch on the natural ground. For example, as shown in FIGS. 7 (a) and 7 (b), the natural ground In the axial direction of 50 tunnels, along the flat arch portion, a steel cylinder 51 having a trapezoidal cross section and joints 52 respectively protruding from the upper end and lower end of both side surfaces of the cylinder 51 are provided. A method of constructing a preceding support work 54 by propelling and burying a plurality of steel pipes with joints 53 provided adjacent to each other is performed. The cylindrical body 51 is formed by connecting an upper plate 51a and a lower plate 51b having a narrower width than the upper plate 51a by side plates 51c and 51c, and the ratio of the width of the upper plate 51a to the width of the lower plate 5 is used. Is changed so that the angle formed by the jointed steel pipes 53 and 53 adjacent to each other corresponds to the curvature of the arch portion (for example, see Non-Patent Document 1).
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However, in the above method, the end portions of the four steel plates must be connected to each other by welding or the like to produce a steel cylinder 51 having a trapezoidal cross section, so that the welding operation is difficult and the work efficiency is poor. . Moreover, since the said cylinder needs to be connected also to a length direction, there existed a problem that the process of welding will increase.
Therefore, in order to reduce the number of welding steps, it is conceivable to prepare a long cylindrical body and weld it, but welding a long steel material itself is not efficient and is not efficient.
The above problem also occurs when the cross-sectional shape of the cylindrical body is rectangular, but when the cross-sectional shape is a trapezoid, the upper plate 51a, the lower plate 51b, and the side plates 51c, 51c are respectively set to a predetermined shape. Therefore, the working efficiency is further deteriorated as compared with the case where the cross-sectional shape is rectangular.

  The present invention has been made in view of the conventional problems, and provides an underground tube that is easy to manufacture and can be easily propelled and embedded in a natural mountain, and a method for burying the tube. Objective.

Invention of claim 1 of the present gun, a plurality of cylindrical body extending in the extending direction of the ground structure, while connected to one another along the cross-sectional shape transverse to the direction of extension of the underground structure earth In the method of burying underground cylinders to be inserted / embedded in a mountain, at least two H-shaped steel flange parts are connected to each other to form a cylinder part, and an excavator is introduced into this cylinder part A side wall member comprising a box that can be moved forwards and backwards and extends in the extending direction of the H- shaped steel at a portion surrounded by the flange portion and the web portion at both ends of the H-shaped steel and is mounted with a water jet spray device on the front surface. It is inserted and excavated the natural ground of the said cylinder front surface, It is characterized by the above-mentioned.
According to a second aspect of the present invention, in the method of embedding an underground cylinder according to the first aspect, in place of the box, a side plate that covers at least a side surface portion of the cylindrical body and a propulsion plate that covers a front surface portion. And using a side wall member extending in the extending direction of the H- shaped steel.
According to a third aspect of the present invention, in the method of embedding a cylinder for underground embedment according to the first or second aspect, when the cylinder is embedded, the side wall member on the connected side is pulled out to form a new cylinder. Forming a part.

According to a fourth aspect of the present invention, in the method for embedding underground cylinders according to any one of the first to third aspects, a guide blade is attached to the tip of the cylindrical body, and the cylindrical body is mounted. It is characterized by being promoted to the natural area.
The invention according to claim 5 is the method for burying underground underground cylinders according to any one of claims 1 to 4, wherein the water jet injection device is provided on the end side of the cylinder, A muddy water discharge port is formed between the water jet spray device and the cylindrical body part, and the excavated earth and sand are discharged from the discharge port.
According to a sixth aspect of the present invention, in the method for embedding underground cylinders according to the fifth aspect, the web portion at the front of the cylindrical body portion is retracted, and at least the discharge of the front surface of the box body is performed. The portion where the outlet is formed is an inclined surface that is inclined to the end portion of the flange portion and the retracted web portion, and the excavated earth and sand are guided to the discharge port.
The invention according to claim 7 is the method of burying a cylinder for underground embedment according to any one of claims 1 to 6, wherein a columnar or cylindrical shape is formed at a flange end of one end of the cylinder. is attached to the engaging member, mounted a guide member having a hollow portion for inserting the columnar or cylindrical engaging member to the flange tip of the other end, the guide member adjacent one of the cylindrical body Further, the above-mentioned engaging member of the other cylinder is pushed while being inserted.

Further, the invention according to claim 8 is that the plurality of cylinders extending in the extending direction of the underground structure are connected to each other so as to follow a cross-sectional shape crossing the extending direction of the underground structure. An underground tube used for an underground structure constructed by being inserted and embedded in a pipe, wherein at least two H-shaped steel flange portions are connected to each other, and the connected H-shaped steel flange portions are connected to each other. Attach a connecting member to each end of the H-shaped steel, and attach a detachable box extending in the extending direction of the H- shaped steel to the portion surrounded by the flange portion and the web portion at both ends of the H- shaped steel. It is characterized by.
The invention according to claim 9 is the tube for underground embedment according to claim 8, wherein at least one H- shaped steel in which the length of one flange portion is shorter than the length of the other flange portion is connected. It is what has been.
Underground barrel of claim 10, in the underground barrel of claim 8, the at least one end of the H-shaped steel, the upper and lower side of the connecting member is a mounting flange The lengths of the parts are different lengths.

According to the present invention, when the underground cylinder is buried, at least two flanges of H-shaped steel are connected to each other to form the cylinder, and the excavator is introduced into the cylinder. In addition, a box that is extended in the extending direction of the H- shaped steel and mounted with a water jet spraying device on the front surface is attached to a portion surrounded by the flange portion and the web portion at both ends of the H- shaped steel. Since the natural ground on the front surface of the cylindrical body is excavated, it is possible to easily insert and embed a cylindrical body having a simple configuration produced by welding the upper and lower flange portions of the H-shaped steel.
The length of the upper and lower flanges of one of the length of the flange portion or connecting a short H-section steel than the length of the other flange portion, of the H-section steel at one end, not connected side Since the angles of the cylinders to be connected can be adjusted by making the lengths different from each other, it is possible to deal with arch portions of various shapes.

Hereinafter, the best mode of the present invention will be described with reference to the drawings.
FIGS. 1A and 1B are views showing a basic configuration of an underground tube 10 according to the best mode, and FIG. 1A attaches side wall members 13 and 14 and a guide blade 15 which will be described later. The previous state, (b) shows the set state (state during propulsion).
The underground buried cylinder 10 welds the upper and lower flange portions 1a, 1b and 2a, 2b of the two H-shaped steels H1, H2, respectively, and the flange portions 1a, 1b of the H-shaped steel H1 are not welded. To attach columnar or cylindrical engaging members 11a and 11b to the end portions on the side, and to insert the engaging members 11a and 11b into the end portions of the flange portions 2a and 2b of the H-shaped steel H2 that are not welded. The guide members 12a and 12b having hollow portions are attached, the space surrounded by the flange portions 1a and 1b of the H-shaped steel H1 and the web portion 1c, and the flange portions 2a and 2b and the web portion 2c of the H-shaped steel H2. The side wall members 13 and 14 made of a box are mounted so as to be able to advance and retreat in such a manner as to embed each of the spaces in the space surrounded by each other. Outside The parts, in order to promote the underground accommodating cylinder 10 to the land Yamauchi, the cross-sectional shape guide blades 15 of the right triangle which narrows in the direction of travel of the underground accommodating cylinder 10 is attached.
In addition, below, it corresponds to the square pipe formed by the welded portion side of the flange portions 1a and 2a of the H-shaped steels H1 and H2, the welded portion side of the flange portions 1b and 2b, and the web portions 1c and 2c. The portion is referred to as a cylindrical portion 16, and the portions of the flange portions 1a and 2a that protrude left and right from the cylindrical portion 16 in the propulsion direction are the upper arm portions 17a and 18a and the flange portions 1b and 2b. The portions protruding from the cylindrical body portion 16 are referred to as lower arm portions 17b and 18b.

In addition, in this example, in order to embed the underground burial cylinder 10 along the arch portion of the cross section of the preceding support work, as shown in FIG. The lengths of the lower arm portions 17b and 18b are cut so as to be shorter than the lengths of the upper arm portions 17a and 18a. As a result, as shown in FIG. 2 (b), the adjacent underground cylinders 10 and 10 can be connected with a predetermined angle, so that the preceding support work having an arch portion of a predetermined shape. Can be built. In the figure, in order to clarify the connected state, the angle between the underground buried cylinders 10 and 10 and the sizes of the engaging members 11a and 11b and the guide members 12a and 12b are greatly drawn. Although it is expressed that there is a large gap between the members 13 and 14, it is needless to say that the gap is actually very small.
Moreover, in this example, as shown also in FIG. 3, while cutting out the front side (propulsion direction side) of the web parts 1c and 2c which comprise the said cylinder part 16 only predetermined length, it is made to retreat from a cylinder front surface. The front surfaces (propulsion surfaces) 13a and 14a of the side wall members 13 and 14 are inclined surfaces inclined from the front surface of the flange portion to the front end of the web portion, and the jets of the plurality of water jet injection devices 20 are disposed on the end portions of the inclined surfaces. The nozzle 21 is attached, and a mud discharge port 19 s is formed between the jet nozzle 21 and the cylindrical portion 16, and the excavating blade 31 of the drilling propulsion device 30 inserted into the cylindrical portion 16 and the water jet. waste sludge equipment which muddy water generated when the drilling natural ground 50 by injection device 20, sent to waste sludge passage 19 which is provided inside the side wall members 13 and 14 from the waste sludge port 19s, not shown this More, it is to be discharged to the outside.
The jet nozzle 21 is connected to a subsequent water supply pipe 22 disposed in the side wall members 13 and 14, and the subsequent water supply pipe 22 is connected to a high pressure hose from a high pressure water generator (not shown). .

Next, a method for constructing a preceding support for a tunnel having a large cross section using the underground buried cylinder 10 according to the present invention will be described.
First, a side wall member in which a drilling propulsion machine 30 for excavating a natural ground 50 is introduced into the cylindrical portion 16 of the underground cylinder 10 and jet nozzles 21 are mounted on both sides of the cylindrical portion 16. 13 and 14 are inserted, the excavating blade 31 of the drilling propulsion machine 30 is rotated, and high-pressure jet water is ejected from the jet nozzle 21 while the natural ground 50 on the front surface of the underground tube 10 is buried. While excavating, the underground buried cylinder 10, the drilling propulsion machine 30, and the side wall members 13 and 14 are integrally propelled into the natural ground 50. As a result, the front side ground 50 of the side wall members 13 and 14 that could not be excavated by the drilling propulsion device 30 can be excavated, and the long arm portions 17a, 17b, 18a, and 18b can be attached to each other with a simple configuration. The underground tube 10 for underground embedment can be easily propelled and embedded in the natural ground 50.
In this example, since the side wall members 13 and 14 are recovered after the underground buried cylinder 10 is connected, as described later, approximately two pieces of two H-shaped steels H1 and H2 are welded. It becomes possible to easily propel and embed the underground cylinder 10 having the size of the underground into the natural ground 50.
Further, the mud containing the soil excavated from the natural ground 50 is sent from the mud outlet 19s of the side wall members 13 and 14 to the mud passage 19 connected to a mud drain device (not shown) and discharged to the outside. . In this example, the propulsion surfaces 13a, 14a of the side wall members 13, 14 provided with the mud discharge port 19s are inclined surfaces that are inclined to the back side so that the excavated earth and sand can be guided to the mud discharge port 19s. Therefore, it is possible to discharge the soil efficiently.
Further, since the high-pressure jet water from the jet nozzle 21 is concentrated and ejected in a narrow region between the guide blade 15 and the outer peripheral portion of the excavation blade 31, the ground 50 can be excavated efficiently and the surplus It is difficult to form a void due to digging, and the water of jet water does not diffuse, so the weakening of the ground can be prevented.

When the embedding of one underground burying cylinder 10 is completed, only the drilling propulsion machine 30 is recovered from the inside of the cylindrical body portion 16 of the underground burying cylinder 10. Then, as shown in FIG. 4, the underground buried cylinder 10 </ b> A adjacent to the underground buried cylinder 10 is propelled into the natural ground 50. At this time, the engaging members 11a and 11a of the underground tube 10A to be embedded next are inserted into the recesses of the guide members 12a and 12b of the underground tube 10 previously embedded, The underground buried cylinder 10 </ b> A is inserted into the natural ground 50. In this example, as shown in FIG. 2 (a), the length of the lower arm portions 17b, 18b is made shorter than the length of the upper arm portions 17a, 18a. at some of, can be placed above underground accommodating cylinder 10 of the multiple on a predetermined curve becomes an arch of the tunnel.
When the burial of the underground burying cylinder 10A connected to the underground burying cylinder 10 is completed, the drilling propulsion machine 30 is recovered from the inside of the cylindrical portion 16 of the underground burying cylinder 10A, The side wall members 13 and 14 inserted in the connecting portions of the underground buried cylinders 10 and 10A are retracted and collected and reused as the side wall members of the underground buried cylinder 10 to be inserted later. After the side wall members 13 and 14 are collected, a new cylindrical portion 16S surrounded by the left and right arm portions 17a and 18a and 17b and 18b and the web portions 1c and 2c is formed.
In addition, after embedding the underground tube 10, solidification material injection devices are introduced into the tube portions 16, 16 </ b> S, and the natural ground 50 on the upper and lower sides of the underground tube 10. It is desirable to inject a ground solidifying agent to improve the ground (not shown) above and below the underground tube 10 in advance.

Thus, in this best mode, the cylindrical body embedded in the arch portion of the ground shoring, the side where the lower flange portion 1b, the length of the welding does not side 2b no welding of the upper flange portion 1a, 2a The flange portions 1a, 1b, 2a, and 2b of the two H-shaped steels H1 and H2 that are shorter than the length are welded to form the rectangular tubular body 16 and the arms 17a, 17b, 18a, and 18b, respectively. At the same time, on both sides of the cylindrical body portion 16, a side wall member 13 is formed of a box body in which jet nozzles 21 of a water jet spray device 20 are attached to the end portions, and a mud discharge port 19 s is formed on the cylindrical body portion 16 side. , 14 is attached to the underground cylinder 10 in such a manner that it can be moved forward and backward. At the time of embedding, the ground pile 50 on the front surface of the underground cylinder 10 is introduced into the cylindrical portion 16. 30 and the water jet spray device 20 While excavating, the underground buried cylinder 10, the hole drilling propulsion machine 30, and the side wall members 13 and 14 are integrally pushed into the natural ground 50, so the H-shaped steels H1 and H2 are welded. The cylindrical body having the long arm portions 17a and 17b and the arm portions 18a and 18b produced in this manner can be easily propelled and embedded in the natural ground 50.
Further, since the side wall members 13 and 14 are mounted so as to be able to advance and retreat, the side wall members 13 and 14 can be recovered and reused after the underground buried cylinders 10 and 10 are connected.

In addition, in the said best form, in order to respond | correspond to the arch part of underground support work, the length of the side which the lower flange parts 1b and 2b do not weld is shorter than the length of the side which the upper flange parts 1a and 2a do not weld 2 The flange portions 1a, 1b, 2a and 2b of the H-shaped steels H1 and H2 are connected to each other. However, as shown in FIG. 5, the length of the lower flange portions 1b and 2b on the welding side is shortened. The cylinder body 16Z may be connected to form an underground tube 10Z having a substantially trapezoidal cross section. In this case, the cross-sectional shape of the space into which the side wall members 13 and 14 are inserted is rectangular, and no gap is generated between the side wall members 13 and 14 and the upper arm portions 17a and 18a. In addition, since the curvature of the arch portion of the underground support work is slight even in the introduction of the drilling propulsion machine 30, even if the cross-sectional shape of the cylindrical body portion 16 is not square or rectangular, the influence on the shape of the arch portion is not affected. rare. Since the gap is a small when viewed from the entire drilling surface, it is not problem even in the promotion of underground accommodating cylinder 10.
In the above example, the side wall members 13 and 14 made of a box are used. However, when the natural ground 50 is soft and easy to propel, as shown in FIGS. 6A and 6B, You may use the side wall member 13A which consists only of the propulsion surface 13a and the side plates 13b and 13b, and the side wall member 13B which abbreviate | omitted the side plate 13b by the side of the cylinder part 16. FIG.

  As described above, according to the present invention, since the underground cylinders produced by welding the upper and lower flange portions of the plurality of H-shaped steels can be easily inserted and embedded, Fabrication is facilitated and it is possible to deal with arch portions of various shapes, so that an underground structure such as a preceding support can be efficiently constructed.

It is a figure which shows the basic composition of the underground underground cylinder which concerns on the best form of this invention. It is a figure which shows an example of the underground burial cylinder applied to the arch part of the underground support work which concerns on the best form of this invention. It is a figure which shows the structure of the front-end | tip part of the underground underground cylinder which concerns on this best form. It is a figure which shows the embedding method of the underground underground cylinder which concerns on this best form. It is a figure which shows the other structure of the underground cylinder for underground. It is a figure which shows the other structure of the side wall member by this invention. It is a figure which shows the construction method of the underground support work using the conventional cylinder for underground burying.

Explanation of symbols

H1, H2 H-shaped steel, 1a, 2a upper flange, 1b, 2b lower flange,
1c, 2c web portion, 10 underground tube, 11a, 11b engaging member,
12a, 12b guide member, 13, 14 side wall member, 15 guide blade, 16 cylinder part,
17a, 18a Upper arm part, 17b, 18b Lower arm part, 19 Waste mud passage,
19s mud outlet, 20 water jet sprayer, 21 jet nozzle,
22 Subsequent water pipe, 30 drilling propulsion machine, 31 drilling blade.

Claims (10)

A cylinder for underground embedment in which a plurality of cylinders extending in the extending direction of the underground structure are connected to each other so as to follow a cross-sectional shape crossing the extending direction of the underground structure while being inserted and embedded in a natural ground In this method, at least two flange portions of H-shaped steel are connected to each other to form a cylindrical body portion, a drilling propulsion unit is introduced into the cylindrical body portion, and flange portions at both ends of the H-shaped steel are connected to each other. A side wall member made of a freely retractable box body, which extends in the extending direction of the H- shaped steel and is fitted with a water jet spraying device on the front surface, is inserted into a portion surrounded by the web portion, and the ground on the front surface of the cylindrical body is inserted. A method for burying underground underground cylinders characterized by excavating a mountain. It replaces with the said box, The side wall member extended in the extension direction of the said H- shaped steel which has the side board which covers at least the side part of the said cylinder, and the propulsion board which covers a front part is used. 2. A method for burying underground underground cylinders according to 1.   3. The underground burying method according to claim 1, wherein when the cylinder is embedded, the connected side wall member is pulled out to form a new cylinder part.   The underground burial cylinder according to any one of claims 1 to 3, wherein a guide blade is attached to a distal end portion of the cylinder, and the cylinder is pushed into a natural ground. Burial method.   The water jet spray device is provided on the end side of the cylindrical body, and a muddy water discharge passage is formed between the water jet spray device and the cylindrical body portion. 5. The underground burying method according to claim 1, wherein the underground burying body is discharged.   The web part at the front of the cylindrical body part is retreated, and at least the part where the discharge path is formed on the front surface of the box is an inclined surface that is inclined to the end part of the flange part and the retreated web part, 6. The underground burying method according to claim 5, wherein the excavated earth and sand are guided to the discharge path. A columnar or cylindrical engaging member is attached to the end of the flange at one end of the cylindrical body, and a hollow portion for inserting the columnar or cylindrical engaging member is inserted into the distal end of the flange at the other end. The guide member having the first cylinder body is attached and the guide member of one adjacent cylinder body is pushed while being inserted into the engagement member of the other cylinder body. A method for embedding underground cylinders according to any one of the above. A subterranean structure constructed by inserting and embedding a plurality of cylinders extending in the extending direction of the underground structure into a natural ground while being connected to each other along a cross-sectional shape crossing the extending direction of the underground structure. A cylinder for underground use used in a structure, which connects at least two flange portions of H-shaped steel, attaches connecting members to both ends of the flange portions of the connected H-shaped steel, and A buried underground cylinder characterized in that a detachable box extending in the extending direction of the H- shaped steel is attached to a portion surrounded by a flange portion and a web portion at both ends of the H- shaped steel. 9. The underground buried cylinder according to claim 8, wherein at least one H- shaped steel having a length of one flange portion shorter than that of the other flange portion is connected. Of at least one end of the H-shaped steel, underground barrel of claim 8, characterized in that it has a length different lengths of the flange portions of the upper and lower side of the connecting member is attached.

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