JP6542825B2 - Construction method of underground structure - Google Patents

Description

  The present invention relates to a construction method of an underground structure which can be constructed without obstructing the upper traffic when a large member of the underground structure is constructed in a cross direction in a lower ground such as a railway or a road. is there.

  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 construction, and the underground structure was constructed as a box (box culvert), and the lower part of the pipe roof was to be propelled, the amount of soil covering would be that this pipe roof exists. It gets thicker. 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.

  In addition, to advance underground structures, it is advanced after drilling on the face. Therefore, a process for excavating the face portion is required, which not only increases the construction cost but also increases the construction period by that amount.

  Moreover, the excavation work at the face area involves the danger of face failure and so on, and also requires work for ground improvement such as stabilization processing for face stability.

In order to eliminate this inconvenience, the inventors of the present invention, when pressing the box-shaped roof as shown in the following patent documents, when promoting a concrete box, together with the promotion of the box, the earth and sand of the face portion together with the roof Since it is extruded, it is not necessary to dig the face separately, cost reduction and construction period reduction can be achieved, and safety can be improved by omitting the digging operation of the face with danger, and the box We applied for the construction method of the underground structure which does not need a large-scale equipment by distributing the reaction force resistance for propelling, and acquired the patent right.
Patent No. 3887 383 Patent No. 4134089 gazette Patent No. 4317843

This method is named as the SFT method and is also described in the following Non-Patent Document 1. In addition, SFT method (Simple and Face-Less Method of Construction of Tunnel) is an abbreviation of "construction method of a simple and faceless tunnel".
Uemura Giken Industrial Co., Ltd. and Underpass Technology Association website on the Internet website http://www.uemuragiken.co.jp/tech/sft.html http://underpass.info/sft.html

  In the SFT method, as shown in FIG. 25 as the first step, the retaining steel sheet pile 2 is placed beside the upper traffic (not shown) such as a railway to build up the starting pit 3 and the reaching pit 4 The propulsion unit 5 is installed in the start pit 3, and the box-shaped roof 6, which is a roof cylinder, is then pressed into the arrival pit 4. The friction cut plate 7 is placed on the upper surface of the box-shaped roof 6 and extruded together with the box-shaped roof 6.

  The box-like roof 6 is a box-like cylinder having a rectangular cross-section as shown in FIGS. 29 and 30, and a hook-like or flat joint 6a, 6b is continuously formed on the side in the longitudinal direction. A friction cut plate 7 made of a flat plate is attached. The box-like roof 6 is formed with flanges for bolt connection at the front and rear ends, and can be sequentially connected in the length direction to embed the required length, and further parallel connection is continued in the vertical and horizontal directions via the joints 6a and 6b Let

  Although the detailed illustration of the propulsion unit 5 is omitted, the earth-and-sand discharge pipe is pushed out with a pushing jack as an extrusion body and the box-shaped roof 6 is excavated. There is a case where an excavating mechanism such as an auger screw or the like is provided other than the case where the method is provided.

  The box-like roof 6 is arranged in a rectangular shape so as to correspond to the outer shape of the concrete box 9 to be promoted, and the earth retaining member 19 is arranged in the face portion surrounded by the arrangement of the box-like roof 6.

  In the figure, 17 is fixed by a tie-lot material 18 which connects the uplifting material, the retained steel sheet pile 2 on the side of the starting pit 3 and the retained steel sheet pile 2 on the side of the reaching pit 4. 20 shows a starting platform.

  Next, as shown in FIG. 26 of the second step, the concrete box 9 is installed in the start pit 3 and the main push jack 10 and the struts 16 as propulsion equipment between the reaction wall 8 and the rear of the concrete box 9 Arrange.

  Then, the friction cut plate 7 is fixed to the start pit 3 side by the stop member 14. The friction cut plate 7 cuts off the box roof 6 and the concrete box 9 from the surrounding soil.

  Next, the front end of the concrete box 9 is joined or abutted to the rear end of the box-shaped roof 6 that has been extruded in advance, and the main push jack 10 is extended as shown in FIG. Push the box 9 forward.

  A soil retaining member 19 disposed at the same time as extruding the box roof 6 at the same time as extruding the box roof 6 while extruding the box roof 6 simultaneously with the extrusion of the concrete box 9 By extruding (using a part of the retained steel sheet pile 2), the soil α in front of it is also extruded simultaneously. In this case, since the rim of the box-shaped roof 6 and the concrete box 9 and the surrounding earth and sand is made by the friction cut plate 7 as described above, the box-shaped roof 6 and the concrete box 9 are smoothly propelled.

  Thus, as shown in FIG. 28 as the fourth step, if the soil extruded simultaneously surrounded by the box-shaped roof 6 and the box-shaped roof 6 reaches the reaching pit 4, the box-shaped roof at the reaching pit 4 Remove the soil and excavate the soil at the same time as removing 6.

  Then, the tip end of the concrete box 9 is further propelled until reaching the reaching pit 4 to complete the promotion of the full length of the concrete box 9.

  In the above-mentioned conventional SFT method, it is necessary to carry out construction with ground improvement such as injection of a chemical solution as a water countermeasure under ground conditions having aquifer ground, so-called ground water.

  An object of the present invention is to provide a construction method of an underground structure which can be constructed even in a flooded ground without using an expensive auxiliary construction method.

In order to achieve the above object, the present invention according to claim 1 is an outer shape of a concrete box to be promoted by pressing friction cut plates together with the friction cut plates into the ground together with the friction cut plates. In a rectangular arrangement of the lower, side and upper stages corresponding to the boxed roof, press-fit the boxed roof into the ground, then place the box by fitting the tip of the box to the end of the boxed roof leaving friction cutting plate with propulsion and towing a box body, the construction method of underground construction extruding inward of sediment rectangular array of box-shaped roof with a rectangular array of box-shaped roof, friction cutting plate Te, One side end of the friction cut plate is bent in the length direction to form a floating flange, and below that one side of the adjacent friction cut plate The gist of the present invention is that the end is overlapped and the side end is overlapped to form a water stop structure.

  According to the present invention, since the side-by-side friction cut plates are stacked to form a water stop structure, underground water to be invaded is stopped by the friction cut plates and does not flow into the concrete box.

  According to a second aspect of the present invention, the friction cut plate in which the side ends are overlapped has a water blocking member interposed therebetween.

  According to the second aspect of the present invention, by providing the water blocking member, a reliable water blocking structure can be obtained.

  The present invention according to claim 3 is characterized in that in the reaching pit for pushing out the earth and sand together with the rectangular array of box roofs, the earth holding jack is provided, and the earth holding jack is reduced and pushed out while suppressing the earth pushing out with the earth holding jack. It is

  According to the present invention according to the third aspect, since the inward sediment pushed out with the rectangular array of the box-like roof is also a softness of water system, reducing and pushing out the retention jack while suppressing the sediment pushed out by the retention jack Can be pushed out more safely.

  As described above, the construction method of the underground structure of the present invention is capable of construction even in the arid ground without using an expensive auxiliary construction method.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 3 to 8 are longitudinal side views of each step showing the first embodiment of the construction method of the underground structure of the present invention, and the same reference numerals as in FIGS. It is attached.

  This embodiment is a case where an underground structure is constructed on the water resistant ground β.

  In the present invention, as in the conventional SFT method, as shown in FIG. 1 as a first step, a temporary earth retaining pile consisting of soil retained steel sheet piles 2 such as sheet piles is hit beside the upper traffic (not shown) The start pit 3 and the arrival pit 4 are built, and as shown in FIG. 2, the start pit 20 is formed by putting rubble and base concrete in the start pit 3 and a propulsion unit (not shown, see FIG. 25) And press-fit the box-like roof 6 which is a roof cylinder toward the reaching pit 4.

  The reach pit 4 is also formed with a reach 21 by rubbish and base concrete placement.

  The box-shaped roof 6 is a box-shaped cylindrical body having a rectangular cross section as shown in FIGS. 29 and 30 as in the prior art, and flanges for bolt connection are formed at the front and rear ends (not shown) The necessary lengths can be embedded by sequentially connecting.

  The box-like roof 6 used in the present invention is formed by continuously forming a hook-like or flat joint 6a, 6b on the side in the longitudinal direction, and the friction cut plate 7 is placed on the upper surface.

  The friction cut plate 7 is a band plate-like steel plate, but the end portion is welded and integrated to the end portion of the box-shaped roof 6 and the rest is simply mounted, and the box-shaped roof 6 is long. In the case of sequential connection in the longitudinal direction, the friction cut plates 7 themselves are connected to each other by welding or the like to be continuous.

  In the present invention, as shown in FIGS. 20 and 21, the friction cut plate 7 is wider than the width of the box-like roof 6 and the side ends are overlapped to form a water stop structure. .

  At the time of such superposition, one side end of the friction cut plate 7 is bent in the length direction to form a floating flange 7a, and one side end 7b of the adjacent friction cut plate 7 is inserted below the flange 7a. Let's do it.

  In this way, the friction cut plates 7 which are arranged side by side can be aligned without changing the level, and can be firmly superposed without being inclined.

  Moreover, as shown in FIGS. 22-24, the friction cut plate 7 which overlap | superposes the said side end may interpose the water stop member 22 between the parts to overlap.

  Although various things can be employ | adopted as this water stop member 22, What is based on the shape | molded synthetic rubber is suitable. In the case shown in FIG. 24, the sheet-like main body is provided with unevenness as a mountain-shaped stripe pattern.

  As shown in FIG. 22, the water blocking member 22 is attached to the back side of the floating flange 7a, and the friction cut plates 7 are crushed when the side ends are overlapped to form a water blocking.

  As shown in FIG. 1 and FIG. 3, the box-shaped roof 6 on which the friction cut plate 7 is stacked is pressed into the reaching pit 4 from the starting pit 3 to correspond to the outer shape of the concrete box 9 to be propelled. The box shaped roof 6 is assembled in a rectangular array of lower, side and upper stages.

  As shown in FIG. 4, the front end of the concrete box 9 installed on the starting platform 20 at the start pit 3 and the end of the box shaped roof 6 arranged in the ground are aligned, and the front of the reaction wall 8 of the start pit 3 The main push jack 10 is placed on the rear end of the concrete box 9 and abuts against the rear end of the concrete box 9 via a push angle 23.

  In addition, at the front end of the concrete box 9, a pushing angle 24 of H-shaped steel material as a box jointer is attached.

  The friction cut plate 7 releases the connection of the end with the box-shaped roof 6 (releasing the welding and fixing) and fixes it to the earth retained steel sheet pile 2.

  As shown in FIG. 4, the front end of the concrete box 9 is joined or abutted to the rear end of the box-like roof 6, and the concrete box 9 is pushed out together with the box-like roof 6 by the primary push jack 10. In the figure, 16 is a strut used at the time of extrusion.

  In addition, the concrete box 9 can also be pulled besides the case where it promotes. In traction, a forward reaction wall of the box is provided, a fixing device or a pulling jack is attached to the rear of the box, and the other end of the pulling cable having one end attached to the fixing device or the pulling jack is fixed to the reaction wall. It is fixed to the tow jack or fixing device, and it is carried out by tow of the tow jack. The propulsion and traction of the concrete box 9 may be performed using either one or both of propulsion and traction.

  Thus, the concrete box 9 is used to push and pull the box-shaped roof 6 at the same time as the concrete box 9 is pushed and towed, and further excavating the box-shaped roof 6 without digging the face portion. When there is no earth and sand between the box-shaped roofs 6 as it is, when the earth and sand are present, the earth and sand are also pushed out to the reach pit 4 together with the box-shaped roof 6.

  In addition, the earth retaining member 19 is disposed at the face part surrounded by the box-shaped roof 6, and while pushing down the earth and sand, it is pushed out together with the box-shaped roof 6, but this earth retaining member 19 mirrors the temporary earth retaining pile 2 An inner steel sheet pile surrounded by the box-shaped roof 6 can be used.

  In addition, the friction cut plate 7 stacked on the box-shaped roof 6 stops the end near the wellhead when pushing out the box-shaped roof 6 at the same time as pushing and pulling the concrete box 9, and leaving it for boxing The roof 6 or the concrete box 9 can be cut off from the ground.

  And, since the friction cut plates 7 which are arranged side by side are stacked to form a water blocking structure as a cylinder, underground water which is going to enter is stopped by the friction cut plates 7 and flows into the concrete box 9 Absent. Thereby, the backfilling injection of the concrete box 9 is unnecessary.

  When the box-shaped roof 6 reaches the reaching pit 4 in this way, the box-shaped roof 6 is collectively removed at the reaching pit 4 one by one.

  FIG. 8 shows the stage in which the press-in of the concrete box 9 is completed and all the concrete box 9 is installed.

  Earth and sand are also pushed out to the reach pit 4 together with the box-shaped roof 6, and this is also removed along with the removal of the box-shaped roof 6.

  9 to 15 show a second embodiment of the present invention, in which the construction length of the underground structure is long, and the distance between the start pit 3 and the reach pit 4 is also large. The box-shaped roof 6 also becomes long.

  In such a case, as shown in FIGS. 11 to 15, when the box-like roof 6 reaches the reaching pit 4, the box-like roof 6 is divided and removed by the reaching pit 4.

  When dividing and removing the box-like roof 6 in this manner, a retaining jack 25 is provided in the reaching pit 4 which pushes out the earth and sand together with the rectangular array of the box-like roof 6 as shown in FIGS.

  Then, the earth retaining member 19 is pushed by the earth retaining jack 25 and the earth retaining jack 25 is shrunk and pushed out while suppressing the earth and sand to be pushed out.

  The extruded soil is removed except for the soil retaining member 19.

It is explanatory drawing which shows arrangement | positioning of the box-shaped roof of the construction method of the underground structure of this invention. It is a front view which shows the concrete box of the construction method of the underground structure of this invention. It is a vertical side view of the 1st process which shows 1st Embodiment of the construction method of the underground structure of this invention. It is a vertical side view of the 2nd process which shows 1st Embodiment of the construction method of the underground structure of this invention. It is a longitudinal side view of the 3rd process which shows 1st Embodiment of the construction method of the underground structure of this invention. It is a longitudinal side view of the 4th process which shows 1st Embodiment of the construction method of the underground structure of this invention. It is a longitudinal side view of the 5th process which shows 1st Embodiment of the construction method of the underground structure of this invention. It is a longitudinal side view of the 6th process which shows 1st Embodiment of the construction method of the underground structure of this invention. It is a vertical side view of the 1st process which shows 2nd Embodiment of the construction method of the underground structure of this invention. It is a vertical side view of the 1st process of the 1st system of the 1st system of division removal of the box type roof which shows a second embodiment of the construction method of the underground structure of the present invention. It is a vertical side view of the 2nd process of the 1st system of the 1st system of the division removal of the box type roof which shows 2nd Embodiment of the construction method of the underground structure of this invention. It is a longitudinal side view of the 2nd process of the 2nd system of the 2nd system of division removal of the box type roof which shows a second embodiment of the construction method of the underground structure of the present invention. It is a vertical side view of the 3rd process of the 2nd system of the 2nd system of division removal of the box type roof which shows 2nd Embodiment of the construction method of the underground structure of this invention. It is a longitudinal side view of the 1st process of the 3rd system of the 3rd system of division removal of the box type roof which shows a second embodiment of the construction method of the underground structure of the present invention. It is a longitudinal side view of the completion form which shows 2nd Embodiment of the construction method of the underground structure of this invention. It is a side view of the 1st process of use of the arrival side retaining jack. It is a side view of the 2nd process of arrival side retaining jack use. It is a side view of the 3rd process of use of the arrival side retaining jack. It is an image figure of a box-shaped roof and concrete box connection. It is an end elevation of a box-like roof and a friction cut plate. It is an explanatory view of superposition of a friction cut plate. It is an explanatory view of water stop member intervention. It is an explanatory view of water stop member intervention. It is an end elevation of a water stop member. It is a vertical side view which shows the 1st process of the construction method of the conventional underground structure. It is a vertical side view which shows the 2nd process of the construction method of the conventional underground structure. It is a vertical side view which shows the 3rd process of the construction method of the conventional underground structure. It is a vertical side view which shows the 3rd process of the construction method of the conventional underground structure. It is a front view of an example of a box shaped roof. It is a front view of the other example of a box-like roof.

DESCRIPTION OF SYMBOLS 2 earth retaining steel sheet pile 3 start pit 4 arrival pit 5 propelling machine 6 box-shaped roof 6a, 6b coupling 7 friction cut plate 7a flange 7b side end 8 reaction wall 9 concrete box 10 source pressing jack 14 stop member 16 strut 17 raising Material 18 tie-lot material 19 soil retaining member 20 launch pad 21 reaching platform 22 water blocking member 23 pushing angle 24 pushing angle 25 earth retaining jack

Claims (3)

A friction cut plate is placed on the outer side, and this box together with the friction cut plate is pressed into the ground to correspond to the outline of the concrete box to be propelled, in a rectangular array of lower, side and upper After placing the box-shaped roof into the ground and aligning the tip of the box to the end of the box-shaped roof and arranging the box, leaving the friction cut plate with the promotion and traction of the box, In the construction method of the underground structure which extrudes the earth and sand of the rectangular array of the box roof together with the rectangular array of the box roof, the friction cut plate bends one side end of the friction cut plate in the length direction is allowed to form a floating-like flange, as one side end of the friction-cut plate next below it enters, waterproofing superimposed side edges Construction methods of underground structures, characterized in that the granulation.   The construction method of the underground structure according to claim 1, wherein the friction cut plate for overlapping the side ends interposes a water blocking member therebetween. The underground structure according to claim 1 or 2, wherein the reach pit for pushing out the earth and sand together with the rectangular array of box roofs is provided with a soil retention jack, and the earth retention jack is shrunk and extruded while suppressing the earth and sand pushed out by the soil retention jack. Construction method.