JP2019100005A - Execution method of underground structure and intermediate pushing jack used therefor - Google Patents

Abstract

To provide an execution method of an underground structure and an intermediate pushing jack used therefor capable of dispersing a thrust force and propelling a box-shaped roof.SOLUTION: An execution method of underground structure according to this invention includes steps of: arranging each of a plurality of box-shaped roofs made of steel pipe of box-shaped tubular body having rectangular cross section so as to coincidence with an outer edge of a concrete box body; forming joint flanges for bolt connection at respective ends of the plurality of box-shaped roofs which are used to press fitting unit tubular bodies one by one; joining the joint flanges with each other in the length direction by fastening them with bolts and nuts, embedding them in advance to push to cause them to penetrate between the start shaft and the reach shaft which are the entire length of the cross section; and installing a concrete box at one end, pushing out the box-shaped roof, and propelling the concrete box, and replacing and setting the box-shaped roof and the concrete box. One of the plurality of unit tubular bodies constituting the box-shaped roof is specified as a tubular body of an intermediate jack tubular body which can be extended by a jack and in the case of the box-shaped roof, the intermediate jack tubular body capable of incorporating the jack is disposed in the middle one of the box-shaped roofs.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method of constructing an underground structure which can be constructed without impeding upper traffic when constructing a large-scale underground structure in a lower part of a railway, a road, etc. in a cross direction It relates to a push-in jack.

  In order to cross the direction of a large member underground structure in the lower ground such as railways, roads etc., a protective construction for supporting upper traffic is required, and a pipe roof where steel pipes etc. are horizontally arranged in parallel etc. Can be mentioned.

  However, if a pipe roof was first formed as a separate work, and the underground structure was constructed by excavating under and inside the pipe roof, or this underground structure would be excavated under the pipe roof, this pipe roof is The amount of overburden increases as much as it exists. Moreover, the protection work of the pipe roof construction is a separate work from the main construction of underground structure burial, and the construction cost and construction period are large.

As a thing which eliminates this inconvenience, there is a box-like roof construction method which also exists in the following patent documents.
Patent No. 2789523 gazette

  As shown in FIG. 18, the start pit 3 and the reach pit 4 are built by placing a steel sheet pile 2 beside the upper traffic 1 such as a railway, and the press machine 5 is installed in the start pit 3 Thus, the box-like roof cylinder 6 is pressed into the reaching pit 4 to form a roof as a guard.

  The box-like roof cylinder 6 is a box-like cylinder having a substantially square cross section of a steel pipe, and a friction cutter 7 formed of a flat plate is placed on the upper surface. (See Figure 22)

  The box-like roof cylinder 6 is used to press-fit the unit cylinder one by one, and as shown in FIG. 22, a joint flange 6 c is formed at an end portion, and the joint flanges 6 c are fastened with a bolt and a nut 19. Thus, the necessary length from the start pit 3 to the arrival pit 4 is embedded by adding one piece at a time in the length direction, and the second, third,... In the drawing, reference numeral 17 denotes a box removing for fastening with a bolt and a nut 19.

  The press-in machine 5 has an extruding mechanism using a jack or the like of the box-like roof cylinder 6.

  The way of arranging the box-like roof cylindrical members 6 is not limited to the gate type as shown in FIG. 21 but is not shown (it is selected appropriately according to the underground structure to be disposed later such as a single character type or a box type).

  Next, as shown in FIGS. 19 and 20, the reaction wall 8 and the underground structure 9 made of a concrete box are set in the start pit 3, and the propulsion jack 10 is placed between the reaction wall 8 and the underground structure 9. The cutting edge 11 is provided at the tip of the underground structure 9 and the small jack 12 is interposed between the tip of the underground structure 9 and the box roof cylinder 6.

  In the figure, reference numeral 13 denotes a support member for the box-like roof cylinder 6, and reference numeral 14 denotes a stop member for the friction cutter 7. These are provided on the start pit 3 side, and a mount 15 is provided on the reach pit 4 side.

  If the box-like roof cylinder 6 is pushed forward one by one while sequentially extending the small jacks 12 and leaving the friction cutter 7 with the underground structure 9 as a reaction force, and all the box-like roof cylinders 6 move forward in a row For example, the small jack 12 is contracted, and then the propulsion jack 10 is extended to dig the underground structure 9. In the figure, 16 shows a strut interposed between the propulsion jack 10 and the underground structure 9.

  Thus, while alternately advancing the box-shaped roof cylinder 6 and advancing the underground structure 9 alternately, as shown in FIG. 20, a unit of one piece of the box-shaped roof cylinder 6 is completely on the reaching pit 4 Then, the joint flanges 6c are unfastened by the bolts and nuts 19 to be divided in the longitudinal direction and sequentially removed.

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

  Incidentally, the underground structure 9 may be constructed such that a precast concrete box is sequentially suspended and connected in the start pit 3 and concrete is cast in the start pit 3 to extend the necessary length. You may do so.

  In addition, with regard to the method of propelling the underground structure 9, a reaction wall and a center hole type traction jack are provided on the reaching pit 4 side, and one end is a traction member by a PC steel wire fixed to the underground structure 9 It is also possible to pull in the underground structure 9 from the reaching pit 4 side by pulling.

  In the construction method of the underground structure which used the above-mentioned box-like roof construction method, long-term construction has increased in recent years while conditions are variously changed. As a result, there is an event that box-shaped roof propulsion becomes difficult at the time of box propulsion.

  In the case of long roofing (in the case of box promotion), the box roof may be hit by the train when the distance is long, and the thrust of the box roof may not be sufficient, which may make it impossible to promote.

  The object of the present invention is to eliminate the disadvantages of the prior art, and to disperse the thrust when it is necessary to increase the thrust of the box roof propulsion due to deflection because the box roof is propelled for a long distance or left for a long time. It is an object of the present invention to provide a construction method of an underground structure capable of propelling a box-like roof and a push-in jack used therefor.

  In order to achieve the above object, the present invention according to claim 1 has a rectangular cross section so as to conform to the outer edge of a concrete box to be installed as a protective work when propelling a concrete box installed as an underground structure. The box-shaped roofs, which are steel pipes of a box-shaped cylindrical body, are arranged, and the box-shaped roof is for press-fitting the unit cylindrical body one by one, forming a joint flange for bolt connection at an end portion. The pieces are joined one by one in the length direction by fastening them with bolts and nuts and bury the required length by pushing in and penetrating between the start shaft and the reach shaft which is the full length of the cross section beforehand, concrete box body at one end In the construction method of the underground structure where the box roof is pushed out and the concrete box is propelled and the box roof and the concrete box are replaced and installed, the box roof is One of position cylinder and stretchable intermediate jack cylinder body by a jack, it is an gist that the intermediate jack cylindrical body incorporating the jack can be arranged in an intermediate portion of the box-shaped roof.

  According to the first aspect of the present invention, in the promotion of the box-like roof, the propulsive force due to long distance or long-term remnant increases more than assumed and there is a possibility that the propulsion can not be performed. Can be pushed in the middle of the box-shaped roof by being able to be disposed in the middle part of the box-shaped roof, and it can be coped with without installing a tow facility etc. on the box reaching side.

  According to a second aspect of the present invention, the jack is inserted from the end of the box-shaped roof, moved in the box-shaped roof, and accommodated in the extendable intermediate jack cylinder.

  According to the invention as set forth in claim 2, this can be optimally carried out for setting the jack in a box-shaped roof which has been inserted and penetrated between the starting shaft and the reaching shaft which are the full length of the crossing section beforehand. .

  According to a third aspect of the present invention, the intermediate jack cylinder is a telescopic telescopic cylinder.

  According to the third aspect of the present invention, one of the unit cylindrical bodies can be easily realized by using the telescopic telescopic cylindrical body as the intermediate jack cylindrical body which can be extended by the jack.

  The present invention according to claim 4 is characterized in that the jack has a support plate which can be slid and laterally extended back and forth.

  According to the fourth aspect of the present invention, the bearing plate can be slid and projected laterally, and when moving within the box-shaped roof, the bearing plate is made to be in a state suitable for movement without projecting. When setting it in the jack cylinder, the bearing plate is slid so that it projects horizontally, is hooked on the cylinder flange, and the pressing plate extends the jack from inside to push the middle jack cylinder back and forth it can.

  According to a fifth aspect of the present invention, the jack is provided with a wheel at its lower portion to be a bogie type.

  According to the invention as set forth in claim 5, the jack can be inserted from the end of the box-shaped roof and pushed by the wheel to move in the box-shaped roof, and the jack can be extended or contracted by the wheel at the bottom. Because of this, it is possible to expand and contract without difficulty by maintaining the horizontal state in the expandable middle jack cylinder.

  The present invention according to claim 6 is a jack which is inserted from the end of the box-shaped roof and is accommodated in the intermediate jack cylinder which can move in the box-shaped roof and can be extended, And a wheel is provided at the lower part to make a bogie type.

  According to the invention as set forth in claim 6, as the push-in jack used in the construction method of the underground structure, when moving in the box-shaped roof, it is made suitable for movement without overhanging the bearing plate. When setting in a cylinder, the bearing plate can be slid and extended horizontally, and can be hooked on the cylinder flange, and the cylinder can be pushed forward and backward by the extension of the jack from the inside by the pressure plate Also, it can be inserted from the end of the box-shaped roof, pushed by the wheel to move in the box-shaped roof, and furthermore, there is a wheel at the lower part to extend and retract the jack, so the expandable middle jack cylinder body It keeps horizontal and can stretch without difficulty.

  As described above, the construction method of the underground structure of the present invention and the inner push jack used therein require the increase of the thrust of the box roof by the deflection since the box roof is long distanced and left for a long time. When this is done, it is possible to disperse the thrust and propel the boxed roof.

It is a vertical side view of the 1st process which shows one embodiment of the construction method of the underground structure of this invention. It is a vertical side view of the 2nd process which shows one embodiment of the construction method of the underground structure of this invention. It is a longitudinal side view of the 3rd process which shows one Embodiment of the construction method of the underground structure of this invention. It is a longitudinal side view of the 4th process which shows one Embodiment of the construction method of the underground structure of this invention. It is a longitudinal side view of the 5th process which shows one Embodiment of the construction method of the underground structure of this invention. It is a longitudinal side view of the 6th process which shows one embodiment of the construction method of the underground structure of this invention. It is a longitudinal side view of the 7th process which shows one embodiment of the construction method of the underground structure of this invention. It is a longitudinal side view of the 8th process which shows one embodiment of the construction method of the underground structure of this invention. It is a longitudinal side view of the 8th process which shows one embodiment of the construction method of the underground structure of this invention. It is a perspective view at the time of contraction of a cylinder for middle jacks. It is a perspective view at the time of extension of a cylinder for middle jacks. It is a perspective view at the time of contraction of a center push jack. It is a perspective view at the time of extension of a center push jack. It is explanatory drawing which shows the protrusion of a bearing plate. It is an explanatory view showing disassembly of a center push jack. It is a perspective view at the time of contraction of a state where a middle push jack is arranged to a cylinder for middle jacks. It is a perspective view at the time of extension of a state where a center push jack is arranged to a cylinder for middle jacks. It is a side view which shows the 1st process of the construction method of an underground structure. It is a side view which shows the 2nd process of the construction method of an underground structure. It is a side view which shows the 3rd process of the construction method of an underground structure. It is a front view which shows one example of the array state of the box-shaped roof cylinder. It is a fragmentary perspective view which shows one example of the box-shaped roof cylinder.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIGS. 1-9 is a longitudinal cross-sectional view of each process which shows one Embodiment of this invention, 20 in a figure shows a box-shaped roof.

  The box-shaped roof construction method using the box-shaped roof 20 is as described with reference to FIGS. 18 to 22 showing the conventional example, and the ground between the start pit 3 and the reach pit 4 of the box roof cylinder 6 is used. This is a method of constructing an underground structure in which an underground structure is disposed at the end of the box-shaped roof 20 which is horizontally inserted by pressing in and parallel to the start pit 3 and which propels the box-shaped roof 20 and the underground structure. .

  The start pit 3 and the reaching pit 4 are built by placing a steel sheet pile 2 beside the upper traffic 1 such as a railway, and the press machine 5 is installed in the reaching pit 4 to make a box-shaped roof cylinder 6 is pressed into the start pit 3 to form a roof as a guard.

  The starting shaft 3 is a shaft for starting the underground structure 9 described later, and the press-in machine 5 is composed of a jack and a strut for propelling the box-shaped roof cylinder 6. Further, in the figure, reference numeral 21 denotes a frame on which the press-in machine 5 and the box-like roof cylinder 6 are installed.

  In the illustrated example, the press-in of the box-like roof cylinder 6 is performed from the reaching pit 4 side with the starting pit 3.

  As shown in FIG. 22, the box-shaped roof cylinder 6 is a box-shaped cylinder having a substantially square cross section made of a steel pipe, and a friction cutter 7 formed of a flat plate is placed on the upper surface.

  The box-like roof cylinder 6 is a unit cylinder press-fitted one by one, and as shown in FIG. 22, a joint flange 6c is formed at the end, and a box cutout 17 is formed behind the joint flange 6c. By joining the joint flanges 6c with each other by bolts and nuts 19, one piece is added in the length direction to bury the necessary length from the reaching pit 4 to the starting pit 3 and, further, a second for the first spot buried in this way, Buried in parallel with the third one ... sequentially. In the figure, reference numeral 22 denotes an end opening pipe positioned at the beginning.

  In addition, the friction cutter 7 is fixed to the box-shaped roof cylinder 6 by welding only at the leading end, and is then connected by welding, and is stretched so as to cover the top together with the press-fitting of the box-shaped roof cylinder 6 .

  As shown in FIG. 4 and the following figures, one of the box-shaped roof cylinders 6 which are unit cylinders is used as the intermediate jack cylinder 23 which can be extended by a jack, and the box-shaped roof cylinders 6 are press-fitted one by one. In this case, instead of the normal box-shaped roof cylinder 6, the intermediate jack cylinder 23 is incorporated and pushed forward.

  As shown in FIGS. 10 to 13, the intermediate jack cylinder 23 divides one box-shaped roof cylinder into two in the front and rear, and each divided body is connected in a nested manner to be expandable. A joint flange 6c is formed at an end portion, a box removing portion 17 is formed on the inner side, and the joint flanges 6c are fastened together with a bolt and a nut 19 at the box removing portion 17.

  14 to FIG. 17, two jacks 25 are arranged, and the respective ends of the cylinder 25a and the rod 25b are joined by the connecting box 26. The wheel 29 is provided at the lower part of the cylinder 25a and the lower part of the rod 25b (including the lower part of the connecting box 26) to form a carriage type.

  Further, flange rails 27 are formed on the upper and lower sides of the connecting box 26, and the bearing plate 28 is engaged so as to be laterally slidable, and the bearing plate 28 is placed on the outside of the connecting box 26.

  As shown in FIG. 14, the bearing plate 28 can slide laterally and can project to the left and right.

  As shown in FIG. 7, a reaction wall (not shown) and an underground structure 9 made of a concrete box are set in the start pit 3, and a propulsive jack (shown in the figure) between the reaction wall and the underground structure 9. And a cutting edge 11 is provided at the tip of the underground structure 9 and a jack storage pipe 30 incorporating a small jack is interposed between the tip of the underground structure 9 and the box-like roof cylinder 6.

  Extend the small jack of the jack storage tube 30 and dig the box roof cylinder while leaving the friction cutter with the underground structure 9 as a reaction force, shrink the small jack and extend the propulsion jack this time to expand the underground structure 9 Dig in.

  In this way, in the reaching pit while alternately advancing the box-shaped roof cylinder 6 and advancing the underground structure 9 alternately, if one unit of the box-shaped roof cylinder 6 completely comes out, The fastening of the joint flanges 6c with each other by the bolts and nuts 19 is released to divide in the length direction and sequentially removed.

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

  In the case where the box-like roof is propelled, if there is a possibility that the propulsive force due to a long distance or long-term remnant may be more than expected and the propelling can not be performed, the middle push jack 24 is disposed on the intermediate jack cylinder 23.

  The installation of the inner push jack 24 is performed by inserting the inner push jack 24 into the box-shaped roof cylinder 6 from the end of the box-shaped roof 20 on the side of the reach pit 4 and moving it to the intermediate jack cylinder 23. The bearing plate 28 is in a state where it does not protrude left and right, and has a size that can pass through without being caught by the joint flange 6 c.

  The movement to the intermediate jack cylinder 23 of the inner push jack 24 can be rolled using the wheels 29.

  Further, as shown in FIG. 15, the middle push jack 24 may be disassembled back and forth between the front and rear sides, carried to the intermediate jack cylinder 23 and assembled here.

  As shown in FIG. 16, the bearing plate 28 is slid sideways to project left and right, and engaged with the inside of the joint flange 6c, for example, the bolt at the four corners, the end of the box extraction for fastening by the nut 19, etc. Let

  In this state, as shown in FIG. 17, when the middle pressing jack 24 is extended, the intermediate jack cylinder 23 is pushed back and forth, and as shown in FIGS. 8 and 11, the middle jack cylinder 23 is extended back and forth. The boxed roof 20 can be extended.

DESCRIPTION OF SYMBOLS 1 ... Upper traffic 2 ... Steel sheet pile 3 ... Starting pit 4 ... Arrival pit 5 ... Press-fit machine 6 ... Tube body 6c for box-like roofs ... Joint flange 7 ... Friction cutter 8 ... Reaction wall 9 ... Underground structure 10 ... Propulsion jack 11 ... blade mouth 12 ... small jack 13 ... support member 14 ... stop member 15 ... mount frame (support) 16 ... strut 17 ... box removal 19 ... bolt, nut 20 ... box shaped roof 21 ... mount frame 22 ... blade mouth pipe 23 ... Cylinders for intermediate jacks 24 ... Medium pressure jacks 25 ... Jacks 25a ... Cylinders 25b ... Rods 26 ... Connection box bodies 27 ... Flange rails 28 ... Pressure plates 29 ... Wheels 30 ... Jack storage tubes

Claims (6)

  Arrange the box-shaped roof which is a steel pipe of the box-shaped cylinder of rectangular section so as to match the outer edge of the concrete box to be installed as a protection worker when promoting the concrete box to be installed as an underground structure The box-like roof is for press-fitting the unit cylinder one by one, forms a joint flange for bolt connection at the end, and by fastening the joint flanges with a bolt and a nut, one piece at a time in the length direction By inserting the necessary length in advance and pushing in and penetrating between the starting shaft and the reaching shaft which are the full length of the crossing section in advance, installing a concrete box at one end, pushing out the box roof and propelling the concrete box In the installation method of the underground structure which substitutes and installs a box-shaped roof and a concrete box, the box-shaped roof is an intermediate jig which can extend one of the unit cylinder by a jack. And Tsu key accommodating cylinder, installation method of underground construction which is characterized in that can be placed intermediate jack cylindrical body incorporating the jack in the middle portion of the box-shaped roof.   The method of installing an underground structure according to claim 1, wherein the jack is inserted from the end of the box-shaped roof and moved in the box-shaped roof to be stored in the extendable intermediate jack cylinder.   The underground jack construction method according to claim 1 or 2, wherein the intermediate jack cylinder is a telescopic telescopic cylinder.   The installation method of the underground structure according to any one of claims 1 to 3, wherein the jack has a support plate which can be slid and laterally extended.   The method of installing the underground structure according to any one of claims 1 to 4, wherein the jack is provided with a wheel at a lower portion thereof to be a bogie type.   A jack inserted from the end of the box-shaped roof and moved in the box-shaped roof to be stored in an expandable middle jack cylinder, having a support plate which can be slid laterally and extended, and a wheel is provided at the lower part This jacking jack is used for the construction method of the underground structure characterized by being in the form of a trolley.