JP5144570B2 - Excavation blade member for box-shaped roof pipe - Google Patents

Description

  The present invention relates to a digging blade member for a box-shaped roof pipe, which is used by being attached to the tip of the box-shaped roof pipe when the box-shaped roof pipe is dug.

For example, a box-shaped roof construction method is used as a method of constructing a box structure in the ground to form an underground passage while crossing the railroad rails and roads and maintaining the state of use of these railroads and roads. Is known (for example, Patent Document 1). As shown in FIGS. 4 (a) to 4 (e), the box-shaped roof construction method preferably has a ceiling 20a and side walls 20b ( FIG. e) A plurality of box-shaped roof pipes 22 having a rectangular cross section are preliminarily installed in the ground as a roof row 21 (see FIGS. 4A and 4B). Then, with the end portion of the friction cut plate disposed on the outer peripheral surface of the roof row 21 fixed to the fixed position, the end surface of the ready-made box structure 20 is brought into contact with the rear end surface of the roof row 21 ( FIG. 4B). ) And (c)), by moving the box structure 20 forward while removing the natural ground inside the roof row 21 through the hollow interior of the box structure 20 (see FIG. 4D ), The box structure 20 is replaced with the roof row 21 by the box-shaped roof tube 22 and is submerged. Is a method that location (see FIG. 4 (e)).

  In such a box-shaped roof construction method, each box-shaped roof pipe 22 constituting the roof row 21 previously installed in the ground is constructed by a joint made of engagement pieces having adjacent box-shaped roof pipes 22 provided on the side surfaces. For example, the propulsion provided at the front end of the start shaft 23 or the box structure 20 while removing the earth and sand on the front end side through the inside of the box-shaped roof pipe 22 in a state of being connected through the section. For example, the box-shaped roof pipes 22 are each excavated by the driving force of the device 24 toward the reaching shaft 25.

  Further, when each box-shaped roof pipe 22 is dug, an excavating blade edge member 26 (10) having a substantially rectangular hollow cross section substantially the same as that of the box-shaped roof pipe 22 is attached to the tip of the box-shaped roof pipe 22 so The ground is cut, and the earth and sand taken in by the cutting is transported backward via a transport device such as a belt conveyor or a shear roller.

Japanese Patent Publication No. 7-35719

  However, the excavation blade member 26 used by being attached to the distal end portion of the conventional box-shaped roof tube 22 has a substantially rectangular hollow cross-section with the front end opening surface opened in a substantially rectangular shape. When the soil of the mountain is hard and viscous soil, it becomes easy for the earth and sand to be taken into the inside of the box-shaped roof tube as a large lump, and suitable for loading these earth and sand lump into a conveyor device such as a belt conveyor or shear roller In order to increase the size, it is necessary to divide the inside of the narrow box-shaped roof tube 22, and much labor is required. In addition, the front end opening surface of the excavation blade member 26 is formed from the inside of the box-shaped roof tube 22 when, for example, gravel of a size that is difficult to be taken into the inside is present in the ground of the face. Since it is necessary to escape to the surrounding ground by manual work, the tip opening surface of the excavation blade member 26 needs to be in a state where it is easy to perform manual work on the ground of such a face surface.

  In the present invention, when the soil of the ground is a hard viscous soil, the mass of the viscous soil can be taken in a size suitable for loading into the transfer device, and the hand from the tip opening surface to the ground of the face surface can be obtained. An object of the present invention is to provide a digging blade member for a box-shaped roof pipe capable of maintaining a state in which work can be easily performed.

The present invention forms a subway by the box structure below the existing structure by installing the box structure in place of the roof line by the box-shaped roof pipe previously installed in the ground. In the box-shaped roof construction method, the box-shaped roof having a substantially rectangular hollow cross-section that is used by being attached to the distal end portion of the box-shaped roof tube when the box-shaped roof tubes constituting the roof row are dug and cutting the ground on the distal end side. Excavation blade member of the pipe, the clay-cut steel plate crossing the opening surface of the tip is attached to the tip portion, leaving a continuous manual work space along the upper side and the lower side of the tip opening surface. And the clay-cut steel plate has two lateral clay-cut steel plates attached so as to divide the tip opening surface into three in the vertical direction, and a vertical attachment attached so as to divide the tip opening surface in the left-right direction. Directional clay-cut steel sheet From it, said longitudinal direction clay cutting steel plate, providing said lateral clay cutting steel plate is supported, the drilling cutting edge member of the upper side portion and the box-shaped roof tubes are installed in separated state and lower portion Thus, the above object is achieved.

  In the excavation blade member of the box-shaped roof pipe of the present invention, it is preferable that two pieces of the longitudinal clay-cut steel plate are attached so that the tip opening surface is divided into three in the left-right direction.

  According to the excavation blade member of the box-shaped roof pipe of the present invention, when the soil of the ground is hard viscous soil, it is possible to take in a lump of viscous soil in a size suitable for loading into the transport device. At the same time, it is possible to maintain a state where it is easy to perform manual work on the ground of the face surface from the tip opening surface.

It is a front view of the excavation blade member of the box-shaped roof pipe concerning one preferred embodiment of the present invention. It is sectional drawing in alignment with the AA of FIG. 1 which shows the excavation blade member which concerns on preferable one Embodiment of this invention in the state attached to the front-end | tip part of a box-shaped roof pipe. It is a rear view of the excavation blade member of the box-shaped roof pipe which concerns on preferable one Embodiment of this invention. (A)-(e) is the longitudinal cross-sectional view and horizontal cross-sectional view explaining the process of the box-shaped roof construction method which forms an underground passage by replacing with the roof row | line | column by a box-shaped roof pipe, and installing a box structure. is there. It is a front view of the excavation blade edge member of the box-shaped roof pipe concerning a reference example .

  The excavation blade member 10 for a box-shaped roof pipe according to a preferred embodiment of the present invention shown in FIGS. 1 to 3 is, for example, in the box-shaped roof construction method shown in FIGS. In order to facilitate the excavation of each box-shaped roof pipe 22 that is installed in advance in the ground and constitutes the roof row 21 when forming an underpass by the box structure 20 across the lower side of the box, It is used by being attached to the tip of the shaped roof tube 22. In addition, the excavation blade member 10 of the present embodiment is configured so that the cut clay soil is not taken into the interior of each box-shaped roof tube 22 as a large lump when the soil soil is hard clay soil. In addition, it has a function that facilitates manual work on the ground surface of the face.

  Here, the box-shaped roof construction method shown in FIGS. 4A to 4E has a substantially rectangular hollow cross section (including a substantially square hollow cross section) along the outer peripheral shape of the box structure 20 to be installed. A plurality of the shaped roof tubes 22 are installed in advance to form the roof row 21, and then the box structure 20 is advanced by bringing the end face of the ready-made box structure 20 into contact with the rear end face of the roof row 21. Thus, the box structure 20 is replaced with the roof row 21 formed by the box-shaped roof pipes 22 and is installed in the ground.

  And the excavation blade edge member 10 of the box-shaped roof tube of this embodiment replaces the roof row 21 by the box-shaped roof tube 22 previously installed in the ground, and installs the box structure 20. In a box roof construction method in which an underpass is formed by a box structure 20 below a railroad rail (existing structure) 27, the tip of the box roof pipe 22 is dug when the box roof pipe 22 constituting the roof row 21 is dug. The excavation blade member 10 is used by being attached to a section and has a substantially rectangular hollow cross section (including a substantially square hollow cross section) that cuts the ground on the front end side, as shown in FIGS. 11 is attached to the distal end portion of the excavation blade member 10 while leaving a manual work space 14 that continues along the upper side portion 11a and the lower side portion 11b of the distal end opening surface 11. It has been.

  Further, in the present embodiment, the clay-cut steel plates 12 and 13 include two lateral clay-cut steel plates 12 attached so as to divide the tip opening surface 11 into three in the vertical direction, and the tip opening surface 11 in the left-right direction. The longitudinal clay-cut steel plate 13 is mounted so as to be divided, and the longitudinal clay-cut steel plate 13 is supported by the lateral clay-cut steel plate 12 and is separated from the upper side portion 11a and the lower side portion 11b of the tip opening surface 11. Further, two longitudinal clay-cut steel plates 13 are attached so as to divide the tip opening surface 11 into three in the left-right direction.

  In the present embodiment, as the box-shaped roof pipe 22 constituting the roof row 21, for example, a known rectangular pipe used in the R & C method (manufactured by Okumura Corporation) can be used. The box-shaped roof tube 22 has a substantially rectangular (substantially square) cross-sectional shape of about 800 mm in length and width, for example, and a hollow portion in which an operator can enter and work.

  The box-shaped roof pipe 22 is composed of a plurality of unit box-shaped roof pipes 22a connected in the axial direction (digging direction) (see FIGS. 4A to 4C). Through the connecting ribs 29 having bolt fastening holes 28 attached to the four corners at both ends in the axial direction of the unit box-shaped roof pipe 22a as it is dug from the vertical shaft 25 toward the reaching vertical shaft 25 (see FIG. 2), the unit box-shaped roof tube 22a is successively added from the rear using the connecting bolt. Further, the box-shaped roof tube 22 is provided with engaging pieces (not shown) that protrude outward from the side surface and extend in the axial direction, and these engaging pieces are engaged with each other and adjacent to each other. By forming a joint portion between the box-shaped roof pipe 22 and the excavation, it is possible to avoid displacement.

  The excavation blade member 10 of the present embodiment is a blade member that is detachably connected integrally to the tip surface of the most advanced unit box-shaped roof tube 22a, as shown in FIGS. , Substantially the same as the unit box-shaped roof tube 22a (preferably slightly larger than the unit box-shaped roof tube 22a by adding a dug portion), for example, a substantially rectangular (square) hollow cross-sectional shape of about 800 mm in length and width And has a length of, for example, about 1000 to 1100 mm. The digging blade member 10 is provided with connecting ribs 16 having bolt fastening holes 15 at the four corners of the rear end portion in the axial direction, and between the connecting ribs 29 of the most advanced unit box-shaped roof pipe 22a. By tightening the connecting bolt, the unit box-shaped roof tube 22a can be easily joined and integrated with the front end surface.

  Further, the tip opening surface 11 of the excavation blade member 10 has the upper side portion 11a protruding forward, for example, about 200 mm from the lower side portion 11b, so that the side side portions 11c on both sides of the tip opening surface 11 are at the upper end. It has a shape that is cut off obliquely except for the portion (see FIG. 2). In this embodiment, two transverse clay-cut steel plates 12 and two longitudinal clay-cut steel plates 13 are attached so as to cross the tip opening surface 11.

  In this embodiment, the transverse clay-cut steel plate 12 is a horizontally long strip-shaped plate member, preferably made of a high-strength steel plate, having a cross-sectional shape with a thickness t1 of 15 mm and a width b1 of about 120 mm, for example. The transverse clay-cut steel plate 12 has upper and lower wide flat surfaces arranged in parallel with the upper side portion 11a and the lower side portion 11b of the front end opening surface 11, and on both sides at positions separated from the upper side portion 11a by about 250 mm and 500 mm, for example. In a state of being spanned between the side portions 11c, the two side portions 11c are fixed in two stages by welding or the like. Further, the lateral clay-cut steel plate 12 has a lower corner portion of the tip portion cut out in a tapered shape, and is provided so as to protrude forward by about 40 mm from a diagonally cut-out portion of the side portion 11c. Yes.

  The longitudinal clay-cut steel plate 13 is a plate member having a cross-sectional shape having a thickness t2 of about 15 mm and a width b2 of about 120 mm, for example, preferably made of a high-strength steel plate. Longitudinal clay-cut steel sheet 13 has left and right wide flat surfaces arranged perpendicularly to upper side portion 11a and lower side portion 11b of tip opening surface 11, and at positions spaced from each side side portion 11c by about 250 mm. While maintaining a distance of about 300 mm between the two longitudinal clay-cut steel plates 13 and being supported by a pair of upper and lower lateral clay-cut steel plates 12, it is fixed to the lateral clay-cut steel plate 12 by welding or the like. Yes.

  Further, the longitudinal clay-cut steel sheet 13 has a parallelogram side surface shape, and one side portion thereof is arranged along the obliquely cut-out portion of the side side portion 11 c of the tip opening surface 11. In addition, a gap of about 125 mm is maintained between the upper edge of the longitudinal clay-cut steel plate 13 and the upper side portion 11a of the tip opening surface 11, and the lower edge of the longitudinal clay-cut steel plate 13 and the tip opening surface 11 An interval of about 175 mm is maintained between the lower side portion 11a. In this way, there is a considerable gap between the upper and lower edges of the longitudinal clay-cut steel plate 13 and the upper side 11a and the lower side 11a of the tip opening surface 11 so that a hand can be inserted. As a result, a manual work space that is continuous along the upper side portion 11a and the lower side portion 11b of the tip opening surface 11 and into which an operator can insert his / her hand is located above and below the longitudinal clay-cut steel plate 13. 14 will be formed.

  And according to the excavation blade edge member 10 of the box-shaped roof pipe of the present embodiment having the above-described configuration, the box-shaped roof pipe 22 is used by being attached to the tip portion of the excavation when the box-shaped roof pipe 22 is dug. In the case of cohesive soil, it is possible to take in a lump of cohesive soil in a size suitable for loading into the transport device, and maintain a state in which manual work can be easily performed from the tip opening surface 11 to the ground of the face surface. It becomes possible to do.

  That is, according to the excavation blade member 10 of the present embodiment, the clay-cut steel plates 12 and 13 traversing the tip opening surface 11 are provided, so that the clay of the ground surface of the face to be cut during excavation is hard clay soil. Even in this case, the clay chopped steel plates 12 and 13 can be divided into small pieces of clay so that the clay can be taken into the inside of the excavation blade member 10 and the box-shaped roof tube 22 as they are. It is possible to easily carry it out by loading it on a conveyor device such as a belt conveyor or shear roller.

  Moreover, according to the excavation blade member 10 of this embodiment, the clay cutting steel plates 12 and 13 which cross the front end opening surface 11 continue along the upper side part 11a and the lower side part 11b of the front end opening surface 11, and the manual work space 14 continues. Is attached to the ground surface of the face, even if there is gravel or the like that is difficult to take in the inside of the face of the face, it can be removed from the inside of the box-shaped roof tube 22 through the manual work space 14. By manual work, it is possible to easily carry out excavation work while allowing gravel and the like to escape to the surrounding ground.

FIG. 5 shows an excavation blade member 17 for a box-shaped roof pipe according to a reference example . The excavation blade member 10 of the reference example shown in FIG. 5 has substantially the same configuration as the excavation blade member 10 of the above-described embodiment except for a portion of the clay-cut steel plate that crosses the tip opening surface 11. That is, in this reference example , the clay-cut steel plate 18 is constituted by two diagonal-direction clay-cut steel plates 18 attached in a diagonal direction.

The excavation blade member 10 of the present reference example can also be subdivided by the diagonal clay cutting steel plate 18 when the box-shaped roof pipe 22 is excavated so that hard clay soil can be taken into the inside as a small clay lump. In addition, it is possible to manually release gravel and the like to the surrounding ground through the manual work space 14 that continues along the upper side portion 11a and the lower side portion 11b of the tip opening surface 11, and the excavation blade of the above embodiment The same effect as the mouth member 10 is exhibited.

The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, it is not always necessary to attach two longitudinal clay-cut steel plates so that the front end opening surface is divided into three in the left-right direction, and one longitudinal clay-cut steel plate can be provided in the center portion .

DESCRIPTION OF SYMBOLS 10, 17 Excavation edge member 11 Front end opening surface 11a Upper end part 11b of front end opening surface Lower side part 11c of front end opening surface Side side part 12 of front end opening surface Lateral clay cutting steel plate 13 Longitudinal clay cutting steel plate 14 Manual work space 15 Bolt fastening hole 16 Connecting rib 18 Diagonal direction clay steel plate 20 Box structure 21 Roof row 22 Box-shaped roof tube 22a Unit box-shaped roof tube 23 Starting shaft 24 Reaching shaft 27 Rail rail (existing structure)

Claims (2)

A box roof construction method in which an underground passage is formed below the existing structure by installing the box structure in place of the roof row of box roof pipes previously installed in the ground. The excavation blade of the box-shaped roof tube having a substantially rectangular hollow cross section, which is used by being attached to the tip of the box-shaped roof tube when the box-shaped roof tube constituting the roof row is excavated and cutting the ground on the tip side A mouth member,
The clay-cut steel sheet crossing the tip opening surface is attached to the tip portion, leaving a continuous manual working space along the upper and lower sides of the tip opening surface ,
Two transverse clay-cut steel plates attached so that the tip-opening surface is divided into three in the vertical direction, and the longitudinal clay attached so as to split the tip-opening surface in the left-right direction. An excavation blade member for a box-shaped roof pipe , comprising a cut steel plate, the longitudinal clay-cut steel plate being supported by the lateral clay-cut steel plate and attached in a state of being separated from the upper side portion and the lower side portion . The box-shaped roof tube excavation blade member according to claim 1 , wherein two pieces of the longitudinal clay-cut steel plate are attached so as to divide the opening surface of the front end into three in the left-right direction.

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