JP2006226008A - Construction method for underground structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure safety when a train or a vehicle runs by immediately returning a friction cut plate to an original position even if it is moved to stop the change of the positions of a rail or a road even if the rail or the road as a proximity structure is present above the friction cut plate in this construction method for an underground structure in which a box type roof and a concrete box disposed at the rear of the box type roof are advanced on the lower surface of the friction cut plate while leaving the friction cut plate in the ground. <P>SOLUTION: This construction method uses a movement amount detection means for the friction cut plate 7 and original position reset means 18 and 19 pulling the end part of the friction cut plate 7. The movement amount of the friction cut plate 7 following the box type roof 6 and the concrete box 9 when the box type roof and the concrete box are advanced is detected by the movement amount detection means, and the box type roof and the concrete box are returned to the original positions by original position returning means 18 and 19 which join the friction cut plate 7 to the concrete box 9 and the friction cut plate 7 to the box type roof 6. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for constructing an underground structure that can be constructed without hindering the upper traffic when excavating and constructing a significant underground structure in a lower ground such as a railway or a road. is there.

  In order to excavate a large number of underground structures in the lower ground such as railroads and roads in the transverse direction, a protective work is required to support the upper traffic, and a pipe roof that horizontally aligns steel pipes, etc. is provided. Can be given.

  However, if a pipe roof is first formed as a separate work and an underground structure is constructed by excavating the pipe roof, or if the underground structure is allowed to dig under the pipe roof, this pipe roof exists. The soil cover becomes thicker by that amount. Moreover, the protective work for pipe roof construction is separate from the main construction for underground structure burial, and the construction cost and construction period are large.

  Conventionally, there is a construction method for an underground structure as shown in FIG. 11 to FIG. As shown in FIG. 11, a retaining steel sheet pile 2 is placed beside the upper traffic 1 such as a railroad to make a temporary shaft retaining shaft, and a starting shaft 3 and a reaching shaft 4 are constructed, and the inside of the starting shaft 3 Then, the propulsion unit 5 is installed, and the box-shaped roof 6 that is the roof cylinder is press-fitted toward the reaching shaft 4.

  FIG. 14 is a front view of the box-shaped roof 6, which is a box-shaped cylinder having a substantially square cross-section, with flange-like joints 6 a and 6 b formed continuously in the longitudinal direction on the side, and a friction consisting of a flat plate on the upper surface. A cut plate 7 is attached. The box-shaped roof 6 can be sequentially connected in the length direction to embed the required length, and is further juxtaposed in parallel in the vertical and horizontal directions via the hook-shaped joints 6a and 6b. FIG. 15 shows a case in which they are arranged in a square shape.

  The propulsion unit 5 includes an extrusion mechanism using a jack of the box-type roof 6 and an internal excavation mechanism of the box-type roof 6 using an auger.

  Next, as shown in FIG. 12, a start stand 17 is built in the start shaft 3, and an underground structure is set by the reaction wall 8 and the concrete box 9, and between the reaction wall 8 and the concrete box 9. Is provided with a propulsion jack 10 which is a main pushing jack, a blade 11 is provided at the tip of the concrete box 9, and a small jack 12 is interposed between the tip of the concrete box 9 and the box roof 6.

  In the figure, reference numeral 13 denotes a support material for the box-type roof 6, and 14 denotes a stop member for the friction cut plate 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 6 is moved forward one by one while the small jack 12 is extended and the concrete box 4 is used as a reaction force to leave the friction cut plate 7 in the ground, the small-sized jack 6 12 is shrunk and this time, the propulsion jack 10 is extended and the concrete box 9 is dug.

  In the figure, reference numeral 16 denotes a strut interposed between the propulsion jack 10 and the concrete box 9.

  In this manner, the box-shaped roof 6 that has come out to the reaching shaft 4 is sequentially removed while alternately repeating the advance of the box-shaped roof 6 and the advance of the concrete box 9.

  And if the front-end | tip of the concrete box 9 reaches | attains the reaching shaft 4, the cutting edge 11 etc. will be removed and backfill grout will be performed suitably and construction will be completed.

  The propulsion method of the concrete box 9 is not limited to the method of extruding with the propulsion jack 10 described above. A reaction wall and a center hole type traction jack are provided on the side of the reaching shaft 4, and one end of the concrete box 9 is attached to the concrete box 9. The concrete box 9 can also be pulled in from the reach shaft 4 side by pulling the traction member made of the fixed PC steel wire with this traction jack.

As another method, after the box-shaped roof 6 is moved forward, the face of the face is excavated and then the concrete box 9 is not moved forward. It is also possible to advance the concrete box 9 without excavating the face part by pushing it out together.
JP-A-55-19312

  When the box-shaped roof 6 and the concrete box 9 are moved forward, a frictional resistance is generated between the box-shaped roof 6 and the concrete box 9 on the lower surface of the friction cut plate 7 disposed thereon, and this frictional resistance force is generated. As a result, a tensile force that moves the friction cut plate 7 in the same direction as the box roof 6 and the concrete box 9 acts on the friction cut plate 7, and as a result, the friction cut plate 7 is applied to the box roof 6 and the concrete box 9. Moves when pulled.

  The movement of the friction cut plate 7 may be due to the elongation of the friction cut plate 7 itself.

  In any case, as a result, the position of a nearby structure such as a railroad or road located above the friction cut plate 7 is also displaced, making it difficult to ensure the safety of traveling of the train or the car. .

  In order to correct such a displacement, it is considered to return the friction cut plate 7 to the original position. However, the friction cut plate 7 is a thin member, and therefore control in the pushing (compressing) direction is not possible. It was difficult to restore the friction cut plate 7.

  The object of the present invention is to eliminate the disadvantages of the conventional example, and to advance the box-type roof and the concrete box arranged behind the friction-cut plate while leaving the friction-cut plate in the ground, Even if the friction cut plate moves following the advance of the concrete box, it immediately returns to its original position. Even if there is a railroad or road as a nearby structure above the friction cut plate, the position of the railroad or road It is to provide a construction method of an underground structure that can prevent the change of the vehicle and ensure the safety of traveling of trains and vehicles.

  In order to achieve the above object, the present invention firstly, a box-type roof is installed between the start shaft and the arrival shaft, and a friction cut plate fixed to the start shaft is disposed on the box roof, and the friction cut is performed. In the construction method of the underground structure in which the box-shaped roof and the concrete box placed behind it are moved forward on the lower surface of the friction cut plate while leaving the plate in the ground, the movement detection means of the friction cut plate and the friction cut plate An original position return means for pulling the end portion, and the movement amount detection means detects the movement amount of the friction cut plate that follows the box-type roof and the concrete box when moving forward, and the original position corresponding to this is detected. The gist is to return the friction cut plate to the original position by the return means.

  Secondly, the original position returning means is provided so that the friction cut plate and the concrete box, and the friction cut plate and the box roof are respectively connected at both ends of the friction cut plate. Third, the original position return is provided. The means is provided with a main girder so that the ends of the friction cut plates arranged side by side are coupled laterally, and the main girder is coupled to the expansion / contraction jack via a tension member. The gist is that the displacement sensor is attached to the upper structure of the cut plate.

  According to the first aspect of the present invention, when the friction cut plate moves following the box-type roof and the concrete box when moving forward, the amount of movement is detected, and the original position returning means detects the amount of movement. The friction cut plate is returned to the original position. Therefore, the railway or road above the friction cut plate does not move along with the movement of the friction cut plate, and it is possible to ensure the safety of traveling of the train or automobile.

In addition, since the original position return means pulls the end of the friction cut plate, the original position return means can be reliably restored without applying pressure to the friction cut plate, which is a thin member.

  According to the second aspect of the present invention, the original position returning means is provided at both ends of the friction cut plate, so that the original position can be returned to the original position by pulling the friction cut plate from both the start shaft side and the reaching shaft side. Therefore, fine control is possible, and the original position can be reliably restored.

  According to the third aspect of the present invention, the in-situ return means can pull a large number of friction cut plates with a smaller number of expansion jacks by connecting the main girder to the expansion jacks via a tension member, Further, since the pull is an expansion / contraction jack, it can be easily controlled, and further, the selection range of installation can be expanded by connecting the expansion / contraction jack to the friction cut plate via a tension member. Further, since the original position returning means is composed of a combination of a pulling material and an extension jack, the structure is simple and can be easily attached.

  According to the fourth aspect of the present invention, the movement amount detecting means is a displacement sensor attached to the upper structure of the friction cut plate, so that the displacement of the upper structure can be directly and reliably detected by this displacement sensor. It is possible to grasp this and directly correspond to the return to the original position as the displacement of the friction cut plate.

  As described above, when the underground roof construction method of the present invention, the box-shaped roof and the concrete box placed behind it are advanced on the lower surface of the friction-cut plate while leaving the friction-cut plate in the ground, the box-shaped roof Even if the friction cut plate moves following the forward movement of the concrete box, the original position return means can immediately return the friction cut plate to the original position. Therefore, there is a railroad or road as a nearby structure above the friction cut plate. Even in such a case, it is possible to prevent the position of the railway or the road from being changed due to the movement of the friction cut plate, and to ensure the safety of traveling of the train or the vehicle.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is a longitudinal side view showing an embodiment of an underground structure construction method of the present invention, FIG. 2 is a plan view of the same, FIG. 3 is a front view of the same, and in the figure, the conventional example shown in FIGS. The same reference numerals are assigned to the same components, and reference numeral 1 in the figure denotes an upper traffic 1 such as a railway.

  The basic construction of the construction method of the present invention is the same as in the prior art, and a box-shaped roof 6 is installed between the starting vertical shaft 3 and the reaching vertical shaft 4, which is constructed by placing a retaining steel sheet pile 2 beside the upper traffic 1. Then, the starting shaft 3 and the reaching shaft 4 are constructed, and the propulsion unit 5 is installed in the starting shaft 3, and the box roof 6 that is a tubular body for the roof is press-fitted toward the reaching shaft 4.

  In this case, the box-shaped roof 6 is arranged in a U shape so as to correspond to the outer shapes of the left and right sides and the upper part of the concrete box 9 to be propelled as shown in FIG.

  A friction cut plate 7 made of a flat plate is disposed on the upper surface of the box roof 6, and the friction cut plate 7 is attached and extruded together with the box roof 6 in the conventional manner.

  Next, the concrete box 9 is installed in the start shaft 3, and the propulsion jack 10 and the struts 16 are disposed between the concrete box 9 and the reaction wall 8 behind the concrete box 9.

  The friction cut plate 7 cuts the box roof 6 and the concrete box 9 and the surrounding earth and sand by fixing the friction cut plate 7 to the start shaft 3 side with a stop member or the like.

  The present invention controls the fixing of the friction cut plate 7 as a displacement control device for an adjacent structure of the underground structure that controls the displacement of the upper traffic 1 that is an adjacent structure of the concrete box 9 that is an underground structure. .

As shown in FIG. 6, this is original position return means 18 and 19 for returning the friction cut plate 7 which moves following the box roof 6 and the concrete box 9 to the original position when the box roof 6 and the concrete box 9 move forward. One original position return means 18 is interposed between the friction cut plate 7 and the concrete box 9 on the start shaft 3 side, and the other original position return means 19 is disposed on the arrival shaft 4 side with the friction cut plate 7 and the box shape. Each was interposed between the roof 6.

  As shown in FIG. 4, the original position returning means 18 on the start shaft 3 side is provided with a main girder 22 made of H-shaped steel or the like that horizontally connects the ends of the friction cut plates 7 arranged side by side on the upper surface of the friction cut plates 7. The main girder 22 is pulled by a telescopic jack 21 that is fixed to the concrete box 9 via the tension member 20.

  The tension member 20 is composed of a pair of elongated vertical flat plates 20a, 20a facing each other by using H-shaped steel having a flange, and the ends of the elongated vertical flat plates 20a, 20a are turned up and down by a pin 23 on the main girder 22. Combine freely.

  As a result, the elongated vertical flat plates 20a and 20a, which are the tension members 20, are fixed to the main girder 22 at the front end of the start shaft 3 at the front end and on the upper portion of the concrete box 9 set in the start shaft 3 at the rear portion. Protrusively to protrude.

  In this state, the expansion jack 21 is fixed on the upper surface of the concrete box 9 by being positioned between the opposed elongated vertical flat plates 20a and 20a. As for the fixing method, the mounting bracket 25 is fixed to the top end of the concrete box 9 with a fixing bolt 24 using an anchor bolt, and the end of the cylinder 21b of the expansion jack 21 is rotatably coupled to the mounting bracket 25 with a pin 23. The tip of the rod 21 a of the telescopic jack 21 is coupled to the elongated vertical flat plates 20 a, 20 a that are the tension members 20 by pins 23.

  The structure of the original position return means 19 on the arrival shaft 4 side is the same as that of the original position return means 18 on the start shaft 3 side, and as shown in FIG. 5, a tension member 20 fixed to the arrival shaft 4 side and this tension material It is comprised with the expansion-contraction jack 21 couple | bonded with 20 and fixed to the box-type roof 6 side.

  The fixing means for the tension member 20 and the expansion / contraction jack 21 is the same as the original position returning means 18 on the start shaft 3 side, so detailed description thereof will be omitted here. The rear ends of the elongated vertical flat plates 20a, 20a, which are the members 20, are fixed to the main girder 22 at the rear position of the reaching shaft 4, and the front portion protrudes so as to extend above the box roof 6 protruding into the reaching shaft 4. To do. And the expansion-contraction jack 21 is arrange | positioned between this elongate vertical flat plates 20a and 20a.

  8 and 9 show the control means of the original position return means 18 and 19, and FIG. 8 shows the case of the automatic control system. A hydraulic jack is used for the extension jack 21 and the branching device 28 with a solenoid valve is used. The telescopic jack 21 is connected to the hydraulic pump 26 by the hydraulic hose 27.

  Further, a computer for calculating the amount of displacement of the signal line 29 connected to the displacement sensor attached to the upper traffic 1 via the signal converter 30 and the cable 31 and calculating the amount of oil to be pumped to the telescopic jack 21 is used. Connect to the arithmetic unit 32.

  Further, the signal converter 30 is connected to the branch device 28 with a solenoid valve by a cable 31.

  FIG. 9 shows a case of manual type, in which the hydraulic pump 26 is connected to the telescopic jack 21 by a hydraulic hose 27. In this case, the displacement amount of the upper traffic 1 is measured manually.

  Next, the construction method of the present invention will be described with reference to FIGS. As described above, the box-shaped roof 6 to which the friction cut plate 7 is attached is pushed out, the friction cut plate 7 is fixed to the start shaft 3 with a fixing tool, and the concrete box 9 is set in the start shaft 3 with the propulsion jack 10. Extrude.

  As a result, the box-shaped roof 6 and the concrete box 9 move forward on the lower surface of the friction cut plate 7 (the state shown in FIG. 10A). At this time, the friction generated on the upper surfaces of the box-shaped roof 6 and the concrete box 9 is obtained. The friction cut plate 7 is pulled in the same direction as the advancing direction of the box-shaped roof 6 and the concrete box 9 by the frictional resistance with the cut plate 7. As a result, the upper traffic 1 located above the friction cut plate 7 is displaced.

  FIG. 10B shows that the box-shaped roof 6 and the concrete box 9 are moved leftward in the drawing by the moving amount a, and as a result, the friction cut plate 7 is moved leftward in the drawing by the moving amount b. And the upper traffic 1 shows the state which moved to the left direction in the figure similarly by the movement amount c.

  In the present invention, the amount of movement is measured, and the amount of operation of the telescopic jack 21 is adjusted based on the amount of movement. However, the method of measuring the amount of movement is preset in the upper traffic 1 in the case of a manual type. An operator measures the amount of movement using a measuring device installed at the measurement point, controls the hydraulic pump 26 based on the measured value, adjusts the amount of oil to be pumped to the extension jack 21, and moves the extension jack 21. Operate.

  On the other hand, in the case of automatic control, the measurement value detected by the displacement sensor attached to the upper traffic 1 is input to the arithmetic device 32 via the signal converter 30, and the amount of movement calculated here is the signal converter 30. To the branch device 28 with solenoid valve. In this branching device 28 with a solenoid valve, the amount of oil pumped from the hydraulic pump 26 is controlled and pumped to the telescopic jack 21 to operate it.

  As described above, an amount of oil corresponding to the amount of movement of the upper traffic 1 is pumped to the telescopic jack 21, and the rod 21a of the telescopic jack 21 moves by a stroke corresponding to the amount of oil.

  In this case, as shown in FIG. 7, the original position return means 18 on the start shaft 3 side is such that the rod 21a extends in the right arrow direction in FIG. As a result, the friction cut plate 7 fixed to the tension member 20 is also pulled rightward and returned to the original position (state shown in FIG. 10c).

  Further, the expansion jack 21 of the original position returning means 19 is also operated as necessary, and the friction cut plate 7 is pulled leftward in FIG. 7 to return the friction cut plate 7 and the upper traffic 1 to the fixed positions.

  When the box-shaped roof 6 and the concrete box 9 are moved forward as described above, even if a tensile force in the same direction acts on the friction cut plate 7, the amount of movement is measured, and the expansion jack 21 is used. The amount of movement can be controlled to be 0 mm constantly.

It is a vertical side view which shows embodiment of the construction method of the underground structure of this invention. It is a top view which shows embodiment of the construction method of the underground structure of this invention. It is a front view which shows embodiment of the construction method of the underground structure of this invention. It is a vertical side view of the apparatus by the side of the start shaft used by this invention. It is a vertical side view of the apparatus on the reach shaft side used in the present invention. It is explanatory drawing which shows embodiment of the construction method of the underground structure of this invention. It is a vertical side view which shows the moving direction of embodiment of the construction method of the underground structure of this invention. It is explanatory drawing in the case of the automatic control system which shows embodiment of the construction method of the underground structure of this invention. It is explanatory drawing in the case of the manual control system which shows embodiment of the construction method of the underground structure of this invention. It is process drawing which shows embodiment of the construction method of the underground structure of this invention. 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 front view of a box-type roof. It is a front view which shows the arrangement | positioning state of a box-type roof.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper traffic 2 Earth retaining steel sheet pile 3 Starting shaft 4 Reaching shaft 5 Propulsion machine 6 Box-type roof 6a, 6b ... Cascade joint 7 Friction cut plate 8 Reaction force wall 9 Concrete box 10 Propulsion jack 11 Cutting edge 12 Small jack 13 Support material 14 Stopping member 15 Receiving base 16 Strut 17 Starting base 18 Original position returning means 19 Original position returning means 20 Pulling material 20a Elongated vertical flat plate 21 Telescopic jack 21a Rod 21b Cylinder 22 Main girder 23 Pin 24 Fixing bolt 25 Mounting bracket 26 Hydraulic pressure Pump 27 Hydraulic hose 28 Branch device with solenoid valve 29 Signal line 30 Signal converter 31 Cable 32 Arithmetic unit

Claims (4)

  A box roof is installed between the start shaft and the arrival shaft, and the friction cut plate fixed on the start shaft is placed on the box roof, leaving the friction cut plate in the ground and behind the box roof. In the construction method of the underground structure in which the placed concrete box is advanced on the lower surface of the friction cut plate, the movement detecting means of the friction cut plate and the original position returning means for pulling the end of the friction cut plate are provided, and the movement The amount detection means detects the amount of movement of the friction cut plate that follows the forward movement of the box roof and the concrete box, and the original position return means correspondingly moves the friction cut plate to the original position. A construction method for underground structures.   2. The method for constructing an underground structure according to claim 1, wherein the original position returning means is provided so as to respectively connect the friction cut plate and the concrete box and the friction cut plate and the box roof at both ends of the friction cut plate.   The base position returning means is provided with a main girder so as to laterally couple the ends of the friction cut plates arranged in parallel, and the main girder is coupled to the extension jack via a tension member. Construction method of structure.   The construction method for an underground structure according to any one of claims 1 to 3, wherein the movement amount detecting means is a displacement sensor attached to the upper structure of the friction cut plate.

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