JP6441842B2 - Box roof cylinder - Google Patents

Description

  The present invention relates to a box-shaped roof cylinder used in a construction method in which a box is propelled or towed to construct a tramway under a railway or road.

  In order to dig a large number of underground structures in the lower ground such as railways and roads in the transverse direction, it is necessary to have a protective work for supporting the upper traffic. It is possible to construct a roof, etc., but it is possible to work safely, reliably and inexpensively because it will be carried out at the same time as excavation of the underground structure without constructing the protective work of the underground structure to be excavated underground. In addition, the following construction methods are known as methods of shallow construction.

  As shown in FIG. 6, first, the earth retaining steel sheet pile 2 is placed beside the upper traffic 1 such as a railroad, and the start pit 3 and the arrival pit 4 are constructed. 5 is installed, and the box-shaped roof cylinder 6 is press-fitted toward the access shaft 4.

  As shown in FIG. 9, the box-shaped roof cylinder 6 is a box-shaped cylinder having a substantially square cross section made of a steel pipe, and is arranged inward with a male joint 6 a in which saddle-shaped components are arranged outward on the side surface. A female joint 6b is formed continuously in the longitudinal direction, and a friction cutter 7 made of a flat plate is attached to the upper surface.

  The box-shaped roof cylinder 6 is for press-fitting unit cylinders one by one, and a joint flange 6c for bolt connection is formed at the end, and the joint flange 6c is fastened with bolts and nuts 19 together. Then, the necessary length is buried by adding one piece at a time in the length direction, and further paralleled through the joints 6a and 6b in the lateral direction.

  Fastening with bolts and nuts 19 is performed at this portion with the box corner 6d of the box-shaped roof tubular body 6 as an outwardly open box opening 6d.

  The way of arranging the box-shaped roof cylinders 6 is appropriately selected according to the underground structure 9 arranged in a single character type, a gate shape, a box shape or the like.

  Next, as shown in FIG. 7, a reaction wall 8 and an underground structure 9 made of a concrete box are set in the starting pit 3, and a propulsion jack 10 is pushed between the reaction wall 8 and the underground structure 9. In addition, a blade 11 is provided at the tip of the underground structure 9 and a small jack 12 is interposed between the tip of the underground structure 9 and the roof cylinder 6.

  In the figure, reference numeral 13 denotes a support material for the roof cylinder 6, and 14 denotes a stop member for the friction cutter 7, which are provided on the start shaft 3 side, while a receiving base 15 is provided on the arrival shaft 4 side.

  If the box-shaped roof cylinder 6 is moved forward one by one while the small jack 12 is extended and the underground structure 9 is used as a reaction force to leave the friction cutter 7, the box-shaped roof cylinder 6 moves forward. The small jack 12 is shrunk, and this time the propulsion jack 10 is extended to dig up the underground structure 9. In the figure, 16 is a strut interposed between the propulsion jack 10 and the underground structure 9.

  In this way, the box-shaped roof cylinder 6 that has come out to the access shaft 4 is sequentially removed while the forward advance of the roof cylinder 6 and the advance of the underground structure 9 are alternately repeated.

  Then, when the tip of the underground structure 9 reaches the reaching pit 4, the blade edge 11 and the like are removed, and backfill grout is appropriately performed to complete the construction.

  In addition, the underground structure 9 may be constructed by sequentially suspending and connecting precast concrete boxes in the start pit 3, or adding concrete in the start pit 3 to increase the required length. You may do it.

  As for the advancement method of the underground structure 9, a reaction wall and a center hall type traction jack are provided on the arrival pit 4 side, and a traction member made of PC steel wire having one end fixed to the underground structure 9 is pulled with this traction jack. There is also a construction method in which the underground structure 9 is pulled in from the arrival mine 4 side.

The following patent document is another example of construction method using a box-shaped roof tubular body 6, and is an abbreviation of “SFT construction method (Simple and Face-Less Method of Construction of Tunnel)”. And is also published in Non-Patent Document 1 below.
Japanese Patent No. 4134089 Japanese Patent No. 4317843 Homepage of Uemura Giken Kogyo Co., Ltd., an internet website http://www.uemuragiken.co.jp/tech/sft.html

  When a concrete box is propelled after press-fitting a box roof, the earth and sand of the face part is pushed out together with the box form roof as well as the box form, so there is no need for additional work to excavate the face part, cost reduction and construction period It can be shortened, safety can be improved by omitting dangerous facet excavation work, and large-scale equipment is required by distributing reaction force resistance to propel the box This is a construction method for underground structures.

  In the construction method of an underground structure in which a box-shaped roof is constructed under the track as described above, and then the concrete structure (box) is promoted and replaced with the box-shaped roof, as shown in FIG. During propulsion and during the rest from propulsion to the box propulsion, there is a tendency to bend in the vertical direction, causing the trajectory to move up and down, and this flexing part also hinders the excavation of underground structures. Therefore, the construction becomes difficult.

The following patent document is proposed as a roof cylinder settlement prevention apparatus and settlement prevention method in a construction method of an underground structure that can prevent the roof cylinder from sagging downward and improve workability. is there.
Japanese Patent No. 3702265

  As shown in FIG. 5, a box-shaped roof cylinder 6 having a friction cutter 7 disposed on the top thereof is press-fitted into the ground from the start shaft 3 and arranged in parallel. In the construction method of the underground structure 9 in which the underground structure 9 is disposed while the friction cutter 7 is left in the ground while the friction cutter 7 is left in the ground, the box-shaped roof tubular body 6 has a longitudinal direction. The pulling ropes 17a and 17b for pulling up the slack portion of the roof cylinder 6 downward are passed through.

  By pulling the rope penetrated in the longitudinal direction inside the box-shaped roof cylinder 6 in the horizontal direction, the vertical vertical component acting on the string is applied to the box-shaped roof cylinder 6. Then, the slack portion of the box-shaped roof tubular body 6 is pulled up, and the slack is eliminated.

  As means for preventing deflection of the box-shaped roof tubular body 6, bolts and nuts 19 are mainly added or a retrofit plate on the tension side (roof lower side) is used, but sufficient effects are obtained. I couldn't.

  Further, in the prevention of the settlement of the roof cylinder according to Patent Document 3, the slack portion is pulled up by the rope, and the apparatus becomes large.

  The object of the present invention is to solve the disadvantages of the conventional example, and to prevent the box-shaped roof cylinder from sagging downward with a simple operation, and to improve the workability. It is in providing a cylinder for use.

  In order to achieve the above object, the present invention according to claim 1 provides a box-shaped roof cylinder of a substantially rectangular cross-section steel pipe in which a joint flange for bolt joining is provided at the end and the corner of the end is open outward. The gist of the present invention is to provide a slit rail on the lower side of the end portion of the cylinder as a metal fitting for hook insertion in the length direction of the cylinder, and to fit the head flat plate of the inverted T-shaped hook member into this slit rail. To do.

  According to the first aspect of the present invention, the box-shaped roof tubular body having a substantially rectangular cross-section steel pipe is formed with a joint flange at the end, and the joint flanges are fastened with bolts and nuts to increase the length by one piece. It is formed by adding in the direction, but by crossing the inverted T-shaped hook members that fit into the slit rails at the connection point, the bending load strength of the connection point is increased, and the box-shaped roof cylinder is moved downward. It is possible to prevent sagging easily and reliably.

  Since the stress of the box-shaped roof cylinder acts on the pulling side (roof lower side), it is possible to cope with this by installing an inverted T-shaped saddle member on the lower side.

  In particular, the inverted T-shaped eaves member has a T-shaped cross section, and the upright plate portion perpendicular to the head flat plate is stronger than a simple flat plate as a reinforcing material.

  Also, put all inverted T-shaped rod members into the slit rail of one box-shaped roof cylinder to be connected, slide the inverted T-shaped rod member after connecting the box-shaped roof cylinder with bolts and nuts. It can be hung on both box-shaped roof cylinders, and the work can be performed easily.

  Further, the inverted T-shaped eaves member can be removed and used repeatedly after the box-shaped roof cylinder is collected, and the box-shaped roof cylinder is not damaged because it is removable.

  The gist of the present invention described in claim 2 is that the upright plate portion orthogonal to the head flat plate of the inverted T-shaped heel member is used as a handle.

  According to the second aspect of the present invention, the upright plate portion orthogonal to the head flat plate of the inverted T-shaped heel member is used as a handle so that the head flat plate of the inverted T-shaped heel member can be used as a slit rail. It can be easily carried out with the handle to be fitted in or moved with respect to the slit rail.

  The gist of the present invention described in claim 3 is that the slit rails are arranged in parallel at a distance.

  According to the third aspect of the present invention, the slit rails, which are the metal fittings for inserting the hooks, are arranged in parallel at intervals, thereby preventing the inverted T-shaped hook members from being stably sagging downward at a plurality of locations. it can.

  As described above, the box roof cylinder of the present invention can easily and reliably prevent the box roof cylinder from sagging downward and improve workability through simple operations. It is.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view showing an embodiment of a box roof cylinder according to the present invention, FIG. 2 is a partially longitudinal side view of the same, and in FIG. It is a cylinder for roofs, and a joint flange 6c is formed at the end.

  Although illustration is omitted, the joint flange 6c is a plate body in which bolt insertion holes as shown in FIG. 9 are formed, and the bolts can be fastened by overlapping them.

  The box-shaped roof cylinder 6 has a cross-sectional shape of 1,000 × 1,000 (mm) and a length of 3,000 (mm), or a cross-sectional shape of 800 × 800 (mm) and a length of 6,000 (mm). The male joint 6a and the female joint 6b (see FIG. 9), which are constituent members, may or may not be present.

  Further, the box-shaped roof tubular body 6 has a box corner 6d whose end corner is open to the outside, and this is a fastening portion for bolts and nuts.

  In the present invention, the slit rail 20 is provided on the lower side of the end portion of the cylindrical body 6 for the box-shaped roof as a hook insertion fitting in the length direction of the cylinder. The slit rail 20 is a channel material in which the slit 21 is formed in the center of the top plate with the slit 21 facing in the length direction, and is attached to the inside of the peripheral wall of the box-shaped roof cylinder 6 by welding or the like.

  In addition, the slit rail 20 is provided in parallel with two intervals.

  The end of the slit rail 20 was cut out of the joint flange 6c, and the opening was exposed on the surface of the joint flange 6c.

  In the figure, reference numeral 22 denotes an inverted T-shaped scissors member that fits into the slit rail 20 as a scissor insertion metal fitting, which comprises a head flat plate 22a and a vertical plate portion 22b perpendicular to the head flat plate 22a. The upright plate portion 22 b rises above the slit rail 20 through the slit 21.

  Incidentally, the inverted T-shaped flange member 22 has a length of about 1,000 to 1,500 mm and a height of about 250 mm including the upright plate portion 22a.

  As shown in FIGS. 6 and 7, the box roof cylinder 6 is used as shown in FIG. 6 and FIG. 4 is constructed, and a press-fitting machine 5 is installed in the start pit 3 so that the box-shaped roof cylinder 6 is press-fitted toward the arrival pit 4.

  The box-shaped roof cylinder 6 is connected to the joint flange 6c with bolts and nuts 19 to add one piece at a time in the length direction and embed the required length. An inverted T-shaped scissors member 22 is fitted in the rail 20. In this case, the end of the inverted T-shaped scissors member 22 is retracted more than the end of the slit rail 20.

  After the box roof cylinders 6 are bolted together, the inverted T-shaped rod member 22 is slid to insert a half (500 mm to 750 mm) into the slit rail 20 of the other box roof cylinder 6. The inverted T-shaped eaves member 22 is bridged between the box-shaped roof cylinders 6.

  In order to slide the inverted T-shaped scissors member 22, the upright plate portion 22b perpendicular to the head flat plate 22a can be used as a handle.

  In this manner, the inverted T-shaped eaves member 22 is crossed over at the connection portion of the box-shaped roof cylinder 6 so that the bending load strength at the connection portion is increased, and the box-shaped roof cylinder 6 is moved downward. It is possible to prevent sagging easily and reliably.

It is a front view after the collar member mounting | wearing which shows one Embodiment of the cylinder for box-shaped roofs of this invention. It is a partial vertical side view after attaching the gutter member which shows one Embodiment of the cylinder for box-shaped roofs of this invention. It is a front view before attaching the eaves member which shows one Embodiment of the cylinder for box-shaped roofs of this invention. It is a partial vertical side view before installation of the eaves member which shows one Embodiment of the cylinder for box-shaped roofs of this invention. It is a side view which shows a prior art example. It is a side view which shows the first half process of the construction method of an underground structure. It is a side view which shows the latter half process of the construction method of an underground structure. It is explanatory drawing which shows the bending of the cylinder for box-shaped roofs. It is a perspective view of the cylinder for box-shaped roofs.

DESCRIPTION OF SYMBOLS 1 ... Upper traffic 2 ... Earth retaining steel sheet pile 3 ... Starting pit 4 ... Arrival pit 5 ... Press fitting machine 6 ... Box-shaped roof cylinder 6a, 6b ... Joint 6c ... Joint flange 6d ... Box opening 7 ... Friction cutter 8 ... Anti Force wall 9 ... Underground structure 10 ... Propulsion jack 11 ... Blade 12 ... Small jack 13 ... Support material 14 ... Stopping member 15 ... Reception 16 ... Struts 17a, 17b ... Rope 18 ... Roller 19 ... Bolt, nut 20 ... Slit rail 21 ... Slit 22 ... Inverted T-shaped flange member 22a ... Head flat plate 22b ... Standing plate portion

Claims (3)

  This is a box-shaped roof tubular body with a substantially rectangular cross-section steel pipe with a joint flange for bolt connection at the end and a box corner with an open end corner that opens outward, and a slit rail on the lower side of the end of the cylinder Is provided in the length direction of the cylinder as a metal fitting for hook insertion, and the head flat plate of the inverted T-shaped hook member is fitted into the slit rail.   2. A box-shaped roof tubular body according to claim 1, wherein the upright plate portion orthogonal to the head flat plate of the inverted T-shaped saddle member is used as a handle.   The box-shaped roof cylinder according to claim 1 or 2, wherein the slit rails are arranged in parallel at a distance.

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