JP2005307544A - Laying method and removal method for covering plate for open shield method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a laying method and a removal method for a covering plate, which can reduce a traffic hindrance and shorten a construction period, when a concrete box is laid by an open shield method. <P>SOLUTION: In this open shield method, bearing girder guide steel materials 21 are installed on both the sides of a place subject to excavation, before the start of the step of excavating/removing sediment ahead of the open shield machine; main-push-cum-retracting equipment 14 is installed in a starting shaft 13; the covering plate 12, wherein the bearing girder 22 is fixed to a lower part, is extruded by the equipment 14 along the steel material 21; and the covering plate 12 is installed in the upper part of the place subject to the excavation. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a method for laying and removing a lining board when an underground structure such as an attached underground passage such as a water and sewage system, a common ditch, a telegraph and a telephone is constructed in an urban area or the like by an open shield method.

  The open shield method is a highly rational method that utilizes the advantages of the open cut method (open cut method) and the shield method. FIG. 14 schematically shows an open shield machine 1 in the figure, which is a shield machine having left, right and left side wall plates 1a and bottom plates 1b connected to the side wall plates 1a, with front, rear and top surfaces opened. It is.

  In this open shield machine 1, the front ends of the side wall plate 1a and the bottom plate 1b are formed as blade edges 11, and the propulsion jacks 2 are arranged in the vertical direction in the center or near the rear end of the side wall plate 1a. In the figure, 3 indicates a partition wall.

  The open shield method to be constructed using such an open shield machine 1 is not shown in the figure, but this open shield machine 1 is installed in the start pit, and the propulsion jack 2 of the open shield machine 1 is extended so that the The open shield machine 1 is moved forward with the reaction force against the reaction wall, the first concrete box 4 forming the underground structure is suspended from above, and the propulsion is shrunk in the tail portion 1c of the open shield machine 1 Set behind jack 2. A strut is disposed between the propulsion jack 2 and the reaction wall to adjust the distance appropriately.

  In addition, the start pit is made up of a retaining wall, and in order to start the open shield machine 1, a part of this retaining wall is mirror-cut. If necessary, the ground is improved at the front part of the starting pit by chemical injection or the like. Sometimes it is left.

  Excavator 9 such as an excavator excavates and removes soil from the front or top surface of open shield machine 1. At the same time as or after this earth removal step, the propulsion jack 2 is extended to advance the open shield machine 1. In the case of this forward process, a pushing angle 8 made of a frame made of box steel or mold steel is arranged in front of the concrete box 4, and the open shield machine 1 receives a reaction force from the concrete box 4 set rearward. Take.

  Then, the second concrete box 4 is suspended in the tail portion 1 of the open shield machine 1 in front of the first concrete box 4. Thereafter, the same soil removal process, advance process, and setting process of the concrete box 4 are repeated as appropriate, and the concrete boxes 4 are sequentially left in the ground as the open shield machine 1 moves forward. Put backfill 5 on the upper surface of 4.

  When the concrete box 4 is suspended in the tail part 1c of the open shield machine 1, a height adjusting material 7 such as a concrete block is disposed under the concrete box 4, and the concrete part 4 is placed in the tail part 1c. The grout material 6 is filled in the left and right and lower spaces of the box 4.

  In this way, if the open shield machine 1 reaches the reaching mine, it is removed and the construction is completed.

  In such an open shield construction method, as described above, the concrete box 4 is left in the ground in a column as the open shield machine 1 advances, and the concrete box 4 is suspended in the tail portion 1c of the open shield machine 1. As the open shield machine 1 moves forward, it leaves the tail portion 1c and remains in the ground. The open shield machine 1 takes a reaction force on the concrete box 4 left in the ground in this way. Advance.

  The concrete box 4 is made of reinforced concrete, and as shown in FIG. 15, is a unitary body including a left side plate 4 a, a right side plate 4 b, an upper floor plate 4 c and a lower floor plate 4 d, and the front and rear surfaces are opened as openings 10.

  By the way, the burying of the concrete box 4 by such an open shield method is often carried out under the road in the city area, and the road is closed during the construction, but the road is opened for a certain time of day. It is obliged to make it possible. Therefore, until the open shield machine reaches from the start pit to the arrival mine, the excavation is appropriately stopped, and a lining plate is laid on the upper opening of the open shield machine, i.e., the cut part of the road, to temporarily open the opening. The vehicle is closed and the car runs on the lining board, and a person can walk.

  For laying the lining plate, conventionally, for example, a girder is installed on the side of the opening, and the lining plates lifted by a crane or the like are placed on the lining plate one by one. In addition, the removal of the lining plate is performed in the opposite operation to the case of laying.

  The prior art is generally performed by those skilled in the art, and is not related to a known invention.

  The above-described method of installing the lining board not only requires time and labor, but also increases the restricted traffic time and has a great influence on traffic.

  An object of the present invention is to eliminate the disadvantages of the conventional example, and to lay and remove a lining plate that can reduce traffic obstacles and shorten the construction period when laying a concrete box by an open shield method. It is to provide.

  In order to achieve the above object, the invention according to claim 1 includes a step of excavating and discharging soil in front of an open shield machine or a front opening of the open shield machine, and extending a propulsion jack to depress the concrete box. Open shield construction method in which concrete boxes are sequentially embedded in columns by repeating the process of moving the shield machine forward with force and the process of setting a new concrete box behind the propulsion jack shrunk in the tail of the shield machine. Before the start of the process of excavating and discharging the earth and sand in front of the open shield machine, install girder guide steel materials on both sides of the planned excavation site and install push-and-pull-back equipment on the starting pit, The gist is to push out the lining plate to which the girder material is fixed along the girder guide steel material by the main pushing equipment, and to install the lining plate at the upper part of the planned excavation place. Is shall.

  According to the first aspect of the present invention, prior to the excavation and earthing of earth and sand and the laying of the concrete box, the lining plate is laid and the road surface is covered, and the excavation of earth and sand and the laying of the concrete box, etc. The construction can be reduced by removing only the lining plates at the necessary locations for daily temporary restoration work. As a result, the restricted traffic time can be shortened and the construction period can be shortened. In addition, since the lining board is laid together with the girder, it is easy to install, has few traffic obstacles, requires less time for laying, and requires little traffic time regulation.

  The gist of the invention described in claim 2 is that the pin jack as the main pushing equipment installed in the start pit is expanded and contracted, and a plurality of lining plates are sequentially pushed out from the start pit side in one direction and installed. It is.

  According to the second aspect of the present invention, since a plurality of lining plates can be pushed out simultaneously in one direction from the starting pit side, traffic obstacles can be reduced and traffic time regulations can be reduced. Even in places where large cranes necessary for laying cannot be installed, lining plates can be laid by extrusion.

  The gist of the invention described in claim 3 is that the girder material is pin-coupled to the main pushing equipment.

  According to the third aspect of the present invention, it is possible to easily perform pulling back by the main pushing equipment by pin-connecting the girder material to the main pushing equipment.

  In the invention according to claim 4, the reaction material and the base concrete are arranged in the starting pit, and the reaction force and the base concrete are used to reduce the pin jack as the pull-back equipment and The gist is to pull back the lining plate fixed thereon.

  According to the present invention of claim 4, the removal of the lining plate can also be performed by sliding the lining plate in one direction and pulling it back just by shrinking the pin jack on the start pit side, so that traffic obstacles can be reduced, In addition, traffic time restrictions can be reduced and the construction period can be shortened. In addition, since the pin jack can be used for pulling back the one used for laying out the lining board, it is not necessary to separately provide equipment for pulling back.

  The laying method and removal method of the lining plate in the open shield method of the present invention are the road surface lining by laying the lining plate prior to the construction by the open shield method when laying the concrete box by the open shield method. As a result, the restricted traffic time can be reduced, and the obstacles can be reduced by sequentially pushing the lining board in one direction from the starting pit, and the construction period can be shortened. The removal of the lining plate can be done in the opposite operation to the case of laying, so that the construction period can be further shortened.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view showing an embodiment of a method of installing a lining plate in the open shield method of the present invention, FIG. 2 is a longitudinal side view of the same as above, and the method of installing a lining plate of the present invention is as shown in FIG. The excavation and excavation of the soil in front of the shield machine using the open shield machine 1 and the process of burying the concrete box 4 in tandem here, on the road surface where the construction is planned, The lining plate 12 is pushed out and laid by the original pushing / retracting equipment 14 from the side toward the reaching pit, and road surface lining is performed.

  As shown in FIG. 3 and FIG. 4, the former pushing and pulling equipment 14 is installed inside the retaining wall 15 placed around the start pit 13, and the reaction material 16 is installed inside the retaining wall 15. A pin jack 17 is installed on the front surface of the reaction force member 16 so as to be rotatable in the horizontal and vertical directions. In the figure, 18 indicates the base concrete placed in the start pit 13.

  The reaction material 16 is a combination of H steel, and a reaction material 16a installed horizontally on the base concrete 18 in contact with the retaining wall 15; and a reaction material 16b installed parallel to and spaced from the reaction material 16b. The reaction force members 16a and 16b are arranged vertically between the reaction force members 16a and 16b, and function as a pile driven through the base concrete 18. The reaction force members 16a and 16b and the reaction force The material 16c is coupled with bolts.

  In the figure, 20 is a strut disposed in front of the pin jack 17, and 19 is an adjusting material provided between the strut 20 and the base concrete 18.

  Next, a method of installing the lining plate 12 will be described with reference to FIGS. 1, 2, and 5 to 7. A starting pit 13 is constructed by retaining the retaining wall 15 and a groove for installing a girder guide steel material for the lining plate 12 for pushing out the lining plate 12 on both sides of the place where the concrete box 4 is to be laid. The excavator 27 such as a backhoe is excavated, and the girder guide steel material 21 is installed in this groove.

  As shown in FIGS. 5 and 16 (b), this girder guide steel material 21 is an angle material having an L-shaped cross section, and in addition to the type installed on a pedestal 21a made of H-shaped steel, FIG. 16 (a). As shown in FIG. 16 (c), the pedestal 21a is also made of an angle material. An angle member of the same shape is joined by a flat plate 21b and combined to form a crank shape as a whole. As shown in FIG. As shown in FIG. 16 (e), two types of girder guide steel materials 21 made of H-shaped steel are bolted up and down to form a girder guide steel material 21 as shown in FIG. Of the cradle 21a coupled laterally at Etc. type of bolted is considered, as long as a shape with a stepped portion for supporting the 受桁 later in any event, selected as appropriate depending on the height of 受桁 22.

  After installing the girder guide steel material 21, the groove is backfilled to complete the installation of the girder guide steel material 21. Further, the start pit 13 is excavated, the original push / retract facility 14 is installed, and the start pit 13 is constructed as described above (see FIGS. 3 and 4).

  The place where the lining plate 12 is to be installed is excavated by an excavator 27 such as a backhoe, the back-filled girder guide steel material 21 is exposed, and the lining plate 12 and the girder 22 are placed on the base concrete 18 in the start pit 13. And set.

  As shown in FIGS. 5 to 6, the receiving girder 22 uses H steel as a girder, and a plurality of H steels are arranged vertically and horizontally and connected by bolts 23. Are arranged in rows and joined together with bolts. Then, the receiving girder 22 with the cover plate 12 fixed integrally therewith is pushed out from the base concrete 18 by the pin jack 17 and is slidably installed on the girder guide steel material 21.

  If the girder 22 with the lining plate 12 fixed to the upper part is installed on the girder guide steel material 21, the front of the lining plate 12 is further excavated by the excavator 9 and then shown in FIGS. 1 and 2. The pin jack 17 is coupled to the receiving girder 22 to extend the pin jack 17 and the strut 20 is used to push the lining plate 12 forward together with the receiving girder 22 so as to slide on the girder guide steel 21. . In this case, a plurality of the lining plates 12 are coupled in a row, and a plurality of pin jacks 17 (three in the illustrated example) are disposed to simultaneously propel the lining plates 12. The reaction force of extrusion is obtained from the back ground.

  As shown in FIG. 7, the connecting structure of the pin jack 17 and the receiving girder 22 includes a bracket 24 made of a horizontal piece protruding from the end of the strut 20 and a bracket 25 made of a horizontal piece protruding from the receiving girder 22. The brackets 24 and 25 are engaged with each other by a connecting pin 26, and the strut 20 and the receiving girder 22 are rotatably connected by pin connection.

  When the lining plate 12 is pushed out from the start pit 13, the pin jack 17 is then contracted, and the next lining plate 12 and the receiving girder 22 are set on the base concrete 18 in the start pit 13. And after excavating the front of the lining board 12 of the front row | line | column pushed out further with excavators 27, such as a backhoe, the several lining board 12 couple | bonded with the row | line | column is carried out with the pin jack 17 like the last time. At the same time, it is pushed forward, and this is repeated to sequentially extrude a plurality of lining boards 12 in a column, and the lining board 12 is laid on the road surface above the place where the concrete box is to be laid.

  As shown in FIGS. 1 and 2, the laying of the lining plate 12 can be carried out from one direction with respect to the laying direction, and the lining is carried out by sliding on the pre-constructed girder guide steel material 21. Since the board 12 and the girder 22 are pushed out at the same time, there are few traffic obstacles and less traffic time restrictions.

  As shown in FIGS. 11 and 12, during construction in the daytime, it is possible to make one-sided traffic without stopping the entire traffic, and as shown in FIGS. By laying 12, the traffic can be made on both sides, but in such a case, the influence on the traffic can be minimized.

  After laying the lining plate 12 as described above, the lining plate 12 is removed and applied only to the portions necessary for installing the concrete box 4.

  Moreover, since the lining board 12 is pushed out in one direction from the start pit 13 side as described above, a heavy machine such as a rough terrain crane that hangs the lining board 12 with a viaduct present above the construction site is installed. Even when it is not possible, the lining plate 12 can be installed at the planned construction site.

  As described above, the lining board 12 is laid and the road surface is covered. When the underground structure is constructed in the lower part and this is completed, the pin jack 17 is contracted and covered as shown in FIGS. The work board 12 is pulled back to the start pit 13 side, and the place where the lining board 12 is laid is immediately backfilled by the bulldozer 28. As a result, the road surface can be opened immediately. Thereby, construction is completed.

  The lining plate 12 can be pulled back easily because the receiving girder 22 and the pin jack 17 are pin-coupled. The reaction force for pulling back is obtained by the friction between the reaction material 16, particularly the reaction material 16 c acting as a reaction force pile and the base concrete 18.

It is a top view which shows embodiment of the laying method of the lining board in the open shield method of this invention. It is a side view which shows embodiment of the laying method of the lining board in the open shield method of this invention. It is a top view of the starting pit in which the laying method and the removal method of the lining board in the open shield method of this invention are implemented. It is a vertical side view of the starting pit in which the laying board laying method and the removal method in the open shield method of the present invention are implemented. It is a front view of the lining board in which the laying method and the removal method of the lining board in the open shield method of this invention are implemented. It is a front view of the coupling | bond part of the receiving girder in which the laying board laying method and removal method in the open shield method of this invention are implemented. It is explanatory drawing of the connection part of the lining board and strut in which the laying method and the removal method of the lining board in the open shield method of this invention are implemented. It is a top view which shows embodiment of the removal method of the lining board in the open shield method of this invention. It is a vertical side view which shows embodiment of the removal method of the lining board in the open shield method of this invention. It is a top view which shows the construction example of the daytime in which the laying method of the lining board in the open shield method of this invention was implemented. It is a vertical side view which shows the construction example of the daytime in which the laying method of the lining board in the open shield method of this invention was implemented. It is a top view which shows the construction example of the night in which the laying method of the lining board in the open shield method of this invention was implemented. It is a vertical side view which shows the example of construction at night in which the laying method of the lining board in the open shield method of this invention was implemented. It is a vertical side view which shows the outline of an open shield construction method. It is a perspective view of a concrete box. It is a longitudinal front view of the girder guide steel material and cradle used in the laying method of the lining board in the open shield method of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Open shield machine 1a Side wall board 1b Bottom board 1c Tail part 2 Propulsion jack 3 Bulkhead 4 Concrete box 4a Left side board 4b Right side board 4c Upper floor board 4d Lower floor board 5 Backfill soil 6 Grout material 7 Height adjustment material 8 Pushing angle 9 Excavator DESCRIPTION OF SYMBOLS 10 Opening 11 Cutting edge 12 Covering board 13 Starting pit 14 Former push-and-pull-back equipment 15 Retaining wall 16, 16a, 16b, 16c Reaction material 17 Pin jack 18 Base concrete 19 Adjustment material 20 Strut 21 Girder guide steel material 21a Receiving base 21b Flat plate 22 Girder 23 Bolt 24 Bracket 25 Bracket 26 Connecting pin 27 Excavator 28 Bulldozer

Claims (4)

  The process of excavating and discharging soil in front of the front or top opening of the open shield machine, the process of extending the propulsion jack and advancing the shield machine with the concrete box as a reaction force, and shrinking in the tail part of the shield machine In the open shield construction method, in which the concrete box is sequentially embedded in series by repeating the process of setting a new concrete box behind the propulsion jack, the step of excavating and discharging soil in front of the open shield machine Before the start, install the girder guide steel on both sides of the planned excavation site, install the pushing and pulling equipment on the starting pit, and install the lining plate with the girder material fixed at the bottom along the girder guide steel A method for laying a lining plate in an open shield method, wherein the lining plate is pushed out by the main pushing equipment and a lining plate is installed at an upper portion of a planned excavation site.   The open shield method according to claim 1, wherein a pin jack as a main pusher installed at the start pit is expanded and contracted, and a plurality of lining plates are sequentially pushed out from the start pit side in one direction and installed. How to install the lining board.   The laying board laying method according to claim 1 or 2, wherein the girder material is pin-coupled to a main pushing facility.   A reaction force material and base concrete are arranged in the starting pit, and the reaction force is taken by this reaction force material and the base concrete to shrink the pin jack as a pull-back equipment, and the girder material and the lining fixed on it. A method for removing a lining board, wherein the board is pulled back.

Images