JP6148709B2 - Road surface lining method in propulsion type open shield method - Google Patents

Description

  The present invention relates to a road surface lining method in a propulsion type open shield method when an underground structure such as a subway such as water and sewage, a common ditch, a telegraph and a telephone is constructed in an urban area or the like by an open shield method.

  The propulsion type open shield method was invented to compensate for the following drawbacks of the open shield method.

  In the open shield method, excavation and earth removal are performed with excavators such as excavators installed on the ground, and the setting of the concrete box to the tail of the open shield machine is performed with a hoist such as a crawler crane installed on the ground. However, when crossing directly under structures such as roads, bridge girders, and large pipes, the excavator and the lifting machine cannot be arranged at the location, and the construction of the open shield method becomes impossible.

  In addition, the propulsion of the open shield machine is performed using the laying box as a reaction force, and the concrete box suspended in the tail part of the open shield machine 1 is connected to the head of the laying box, and the inside of the tail part of the shield machine. The propulsion jack 3 shrunk in the step moves forward while leaving the concrete box 4 behind by using the suspended concrete box 4 as a reaction force. Therefore, a tail void (cavity) is generated between the box and the ground as the thickness of the tail bottom plate and the side plate. If this tail void is left undisturbed, the stress on the ground will increase, causing collapse and settlement.

  In cases where construction (carrying, hanging down, etc.) is difficult and the construction site is narrow or where there is a limited head, the shield machine is propelled by a shield jack as shown below. The propulsion type open shield construction method is adopted, which is laid out sequentially by the main push jack installed in the start shaft.

  As shown in FIGS. 19 and 20, the open shield machine 1 is a shield machine having a front surface, a rear surface, and an upper surface that are formed of left and right side wall plates 1a and a bottom plate 1b connected to the side wall plates 1a.

  The open shield machine 1 has the same width as the concrete box 4 to be laid and the width of the shield machine, the tip of the side wall plate 1a and the bottom plate 1b is formed as a cutting edge, and is located near the center or the rear end of the side wall plate 1a. The shield jacks 3 are arranged side by side in the vertical direction.

  Of the blade edge, the side wall portion is divided and movably formed as a sliding earth retaining 16, and the bottom plate portion is provided with a bottom jack 19 as a movable divided bottom plate 18. The slide type earth retaining 16 is for preventing the collapse of the side ground during excavation, and expands and contracts from the tip of the open shield machine 1 to 1.0 m. In the figure, 17 is a slide jack for the sliding earth retaining 16.

  A drainage gate 14 was provided at the back of the blade edge. This drain gate 14 is installed at the time of renovation work of the existing water channel, and is opened when the water that has increased in the rain flows directly to the laying box. The gate is lowered during normal construction.

  In the figure, reference numeral 15 denotes a press bar which is a box joint which is placed between the shield jack 3 and the concrete box 4 and transmits thrust.

  At the starting base, a starting shaft 8 provided for laying the box, installing a shield machine, and assembling is installed, and at the end of the construction, a reaching shaft 13 to which the shield machine reaches for dismantling and removing the shield machine is installed. There are steel sheet pile method, main pile side sheet pile method, liner plate method, etc. as earth retaining method for shaft construction.

  A bearing wall 22 for supporting the reaction force of the main push jack 23 is constructed in the innermost part of the start shaft 8, and the main push jack 23 is installed by assembling steel on the front surface thereof. The bearing wall 22 is made of steel materials assembled in a cross-beam shape, or unreinforced concrete is cast, and reinforced concrete is used as necessary.

  The foundation is formed with the crushed stone 39 and the foundation concrete 40 thereon, and the steel plate is placed on the entire surface of the steel plate on the rail to form the cradle 25 for installation and start of the shield machine. To do. Moreover, in order to maintain the straightness of the shield machine and the box, guide steel 26 made of H steel is installed on both sides of the shield machine.

  The open shield machine 1 is installed in the start shaft 8 and propelled, and the concrete box 4 is installed between the open shield machine 1 and the main push jack 23, and is pushed by the main push jack 23.

  The top box 4a, which is the top, is connected to the open shield machine 1, but is connected by a PC steel bar 29, and the press bar 15 is connected to the PC steel bar 29 and the towing jack 30 by an open shield machine. The press bar 15 and the leading box 4a are fastened with a PC steel rod 29.

  When the extension width of the main push jack 23 is insufficient, the strut 24 is disposed between the main push jack 23 and the press bar 15.

  As shown in FIGS. 17 and 18, the propulsion excavates the natural ground in the face with an excavator 6 such as a backhoe and propels the open shield machine 1. Alternatively, a person enters the inside of the open shield machine 1 and excavates the front face of the open shield machine 1 with effort, thereby propelling the open shield machine 1.

  In FIG. 19, 20 is a friction cut plate installed to cut the edge of the box and backfilling material and propel only the box, and is made of a thin iron plate or the like, where the box 4 has come out of the start shaft 8. Will be installed from.

  The propulsion of the open shield machine 1 is propelled by the shield jack 3 installed inside the shield machine as a reaction force to the installed concrete box 4, and in this case, the leading box 4a and the open shield by the PC steel rod 29 are used. The tightness of machine 1 is released. In the figure, reference numeral 30 denotes a towing jack for the PC steel rod 29.

  Next, the main pushing jack 23 is used as a reaction force for the bearing wall 22 to shift to box propulsion in which all installed concrete boxes 4 are propelled.

  With the propulsion of the open shield machine 1, backfill 5 is applied to the upper part of the box behind the shield machine 1 with sand or the like.

  In this manner, a step of excavating and discharging soil in front of the front or top opening of the open shield machine 1, a step of extending the shield jack 3 and causing the concrete box 4 to react to advance the shield machine The concrete box 4 is pushed out by the main pushing jack 23 installed in the start shaft 8, and the new concrete box 4 is disposed between the main pushing jack 23 and the pushed concrete box 4, and the pushing is repeated. Is repeated, and the open shield machine 1 is made to reach the reaching shaft 13. However, the thrust force for pushing the open shield machine 1 and the concrete box 4 is insufficient or the bearing wall reaction force is insufficient with the main pushing equipment alone. The intermediate pushing equipment 21 is provided.

  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.

  For this reason, until the open shield machine reaches from the start pit to the arrival mine, after the completion of daily construction, the excavation is stopped as appropriate, and the lining plate is placed on the upper opening of the open shield machine, that is, the part of the road that has been cut. The opening is temporarily closed to allow the car to run on the lining plate and for people to 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 manner to the case of laying. In this case, when the construction site is orthogonal so as to cross the road, the laying board is laid so as to extrude from one side of the road toward the other side.

  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.

Therefore, for example, as shown in Patent Document 1 below, the road surface is covered by laying a lining plate prior to the construction by the open shield method, and the lining plate is sequentially extruded in one direction from the starting pit. There are ways to reduce traffic obstacles.
JP 2005-307544 A

Moreover, the following patent document 2 is a thing which extrudes a lining board in one direction from the starting pit of a construction place in the installation method of a lining board like the said patent document 1, and makes it a both-sides traffic at night. Even if it can be done, it will be one-sided traffic during the daytime when there is a lot of traffic, and the construction period will be prolonged accordingly, and the vehicle regulation period will be prolonged and the impact on traffic will be great. It was proposed as an installation method.
JP 2010-242373 A

  This patent document 2 discloses a process of excavating and discharging soil in front of the front or top opening of an open shield machine, a process of extending a propulsion jack and advancing the shield machine using a concrete box as a reaction force, In the open shield method, in which the concrete box is buried in series in sequence by repeating the process of setting a new concrete box behind the propulsion jack shrunk in the tail section of the machine, the road where the construction site is perpendicular to the road Below, the lining board propulsion jacks are installed on both sides of the road, the lining board is pushed and laid from one side of the road to the approximate center of the road, and then the road The gist is to push and lay the lining board to the approximate center.

  According to the invention of Patent Document 2, since the lining board is laid on the other half of the road after the laying board is laid from the opposite direction, the half of the road is always opened. Therefore, the vehicle can run on one half of this side, and traffic can be reduced without any traffic restrictions.

  In both Patent Document 1 and Patent Document 2, a lining plate is laid. By the way, the lining board is widely used as a temporary gantry and pier floor board as well as various road excavation works such as subway construction, underground city construction and underground piping work.

  In this way, in the road surface lining by the lining plate, the lining plate itself is a large one having a large width and length, and the covering lining is installed on the side of the opening and lifted by a crane or the like. Even if the boards are placed one by one as if they are placed one by one, it is a big task that takes time and effort. In addition, it takes time and effort to eliminate backlash of the lining plate even after installation.

  Also, the removal of the lining plate is the same because it is performed in the opposite operation to the case of laying.

  Even in Patent Document 1 and Patent Document 2, since a lining plate is used for road surface lining, although devised in the way of laying, to use a large member having a large width or length The problem remains the same.

  The object of the present invention is to eliminate the inconvenience of the conventional example, and because the member width is short compared to the lining plate, one propulsion amount may be a short distance, and is effective even when a single propulsion distance such as a large cross section is short. And, by using H steel that is lightweight and easy to handle, it is simple and quick, with low construction costs, shortening the construction period, and ensuring the required length, and by using H steel that is lightweight and easy to handle, it is simple. Another object of the present invention is to provide a road surface lining method in a propulsion type open shield method that can be quickly and inexpensively constructed and shortened in construction period.

In order to achieve the above object, the present invention as claimed in claim 1 includes a step of excavating and discharging earth and sand ahead of the front or upper surface opening of an open shield machine, and extending a propulsion jack to shield the concrete box as a reaction force. A step of advancing the machine and a propulsion step of extruding the concrete box with a main jack installed in the starting pit, placing a new concrete box between the main jack and the extruded concrete box. In the repetitive propulsion type open shield method, at the road crossing point, H steel is used as a girder and it is installed on the road surface from the ground, and the road surface lining is formed side by side with the flange surface facing upward. the underlying to excavation open shield machine, stringer by H steel, and removed one by one by or more present when the concrete a box body propulsion, concrete It is an Abstract that propel the box making bodies.

  According to the first aspect of the present invention, since the road surface lining is formed using H steel as a girder, the member width is shorter than that of a conventional road lining with a lining plate, there is no rattling caused by vehicle traffic, and it is necessary. The length can be secured, and it is lightweight and easy to handle.

  Since the girder is fixed to the ground and the girder is separated from the propulsion concrete box, it is not affected by the frictional force when propelling the concrete box, so there is no deformation of the road surface, and the road surface under construction No maintenance is required.

In addition, since the girders made of H steel are removed one by one or a plurality at a time when propelling the concrete box and the concrete box is pushed , the opening amount of the removed portion can be reduced.

The gist of the present invention described in claim 2 is that the steel H, which is a girder, is continuously arranged side by side with the flange face up, and is fastened with a PC steel material penetrating the web.

According to the second aspect of the present invention, when the road surface lining is formed side by side with the flange surface facing upward by installing H steel as a girder on the road surface, the steel plate is fastened and fixed to each other. Thus, they can be stably arranged and integrated, and can be easily removed by releasing this tightening even when they are removed one by one when propelling the concrete box.

According to the third aspect of the present invention, the H steel as the girder is attached so that the key plate protrudes outward from the end of the flange from the back surface of the flange, and this is applied to the back side of the flange of the adjacent girder. The gist is to fix them to each other by contact.

According to the present invention as set forth in claim 3 , when the road surface covering is formed side by side with the flange surface facing upward by installing H steel as a girder on the road surface, the steel plates are fixed to each other via the key plate. The key plate can be removed easily to remove them one by one when propelling the concrete box.

  As described above, the road surface lining method in the construction method of the underground structure according to the present invention has a short member width compared to the lining plate, so that one propulsion amount may be a short distance, and a single propulsion distance such as a large cross section. By using H steel, which is effective even when it is short, lightweight and easy to handle, the construction cost can be reduced easily and quickly, and the construction period can be shortened.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is a plan view of a pre-process showing one embodiment of a road surface covering method in the propulsion type open shield method of the present invention, FIG. 2 is a plan view of the post-process, and FIG. 3 is a plan view of the pre-process, FIG. Is a plan view of the subsequent process, and the same reference numerals are given to the same constituent elements as those in FIGS. 15 to 20 showing the propulsion type open shield method.

  The present invention is also based on the premise that it is constructed by the propulsion type open shield method, and the construction content is as described above.

  As shown in FIGS. 19 and 20, the open shield machine 1 to be used is a shield machine having a front surface, a rear surface, and an upper surface which are formed of left and right side wall plates 1a and a bottom plate 1b connected to the side wall plates 1a.

  In the open shield machine 1, the width of the concrete box 4 to be installed and the inner diameter of the shield machine are substantially the same, the tip of the side wall plate 1a and the bottom plate 1b is formed as a cutting edge, and the center or rear of the side wall plate 1a. Near the end, the shield jacks 3 are arranged side by side facing up and down.

  Of the blade edge, the side wall portion was divided and formed as a slide-type retaining ring 16 so as to be movable. The slide type earth retaining 16 is for preventing the collapse of the side ground during excavation, and expands and contracts from the tip of the open shield machine 1 to 1.0 m. In the figure, reference numeral 17 denotes a slide jack for taking in and out the slide-type earth retaining member 16.

  In the figure, 8 is a start shaft, 13 is a reach shaft, the start shaft 8 is provided as a start base for laying a box, installing a shield machine, and assembling, and the reach shaft 13 is a construction end point for dismantling and removing a shield machine As the earth retaining method for constructing these shafts, there are a steel sheet pile method, a parent pile sheet pile method, a liner plate method and the like.

  In the start shaft 8, a bearing wall 22 for supporting the reaction force of the main push jack 23 is constructed at the innermost part of the start vertical shaft 8, and a base is formed by assembling a steel material on the front surface thereof. Install.

  At the bottom of the start shaft 8, a foundation is formed with the crushed stone 39 and the foundation concrete 40 above it, and H steel is arranged in a rail shape on it and an iron plate is installed on the entire surface to install and start the shield machine. The cradle 25 is formed. Moreover, in order to maintain the straightness of the shield machine and the box, guide steel 26 made of H steel is installed on both sides of the shield machine.

  The open shield machine 1 is installed in the start shaft 8 and propelled, and the concrete box 4 is installed between the open shield machine 1 and the main push jack 23, and is pushed by the main push jack 23.

  The concrete box 4 has the same width as that of the open shield machine 1 and is higher than the open shield machine 1 and has a height that allows construction without soil covering.

  A press bar (push angle) 15 is interposed in front of the topmost concrete box 4.

  When the extension width of the main push jack 23 is insufficient, the strut 24 is disposed.

  In the example shown in the figure, the open shield machine 1 is propelled by excavating the ground in the face by human power and excavating while holding the side soil with the sliding earth retaining so that the side ground does not collapse. Let Or although illustration is abbreviate | omitted, the open shield machine 1 is propelled by excavating the earth and sand from the front surface or upper surface of the open shield machine 1 with the excavator 6 such as an excavator.

  The open shield machine 1 is propelled by a shield jack 3 installed inside the shield machine against the installed concrete box 4 as a reaction force.

  After the propulsion of the open shield machine 1, the process proceeds to the box propulsion in which all the installed concrete boxes 4 are propelled by using the main push jack 23 with the bearing wall 22 as a reaction force.

  In this manner, a step of excavating and discharging soil in front of the front or top opening of the open shield machine 1, a step of extending the shield jack 3 and causing the concrete box 4 to react to advance the shield machine The concrete box 4 is pushed out by the main pushing jack 23 installed in the start shaft 8, and the new concrete box 4 is disposed between the main pushing jack 23 and the pushed concrete box 4, and the pushing is repeated. Is repeated until the open shield machine 1 reaches the reaching shaft 13.

  Although the road surface crossing point α is constructed by the open shield method, road surface lining is performed. For this, without using a lining plate, H steel is used as a girder 31 on the road surface from the ground and the flange 31a. Road surface lining was formed side by side with the side up.

  The details of the first embodiment are shown in FIGS. 5 to 7, and foundation concrete 32 is placed on both sides of a road crossing point α, and a girder receiving material 33 made of H-shaped steel is placed on the concrete. The end of the girder 31 is supported by the receiving member 33.

  This 1st Embodiment is a case where the girder 31 is installed so that a surface position may correspond with the upper floor board of the concrete box 4. The foundation concrete 32 is placed, and a girder receiving member 33 made of H-shaped steel is disposed on the foundation concrete 32 so that the girder 31 can be installed as such.

  In the present embodiment, the H steel as the girder 31 is laid and continuously arranged side by side with the surface of the flange 31a up as described above, but from the back surface of the flange 31a positioned vertically with the web 31b in the middle. The key plate 34 is attached so as to protrude outward from the end portion of the flange 31a, and the key plate 34 is brought into contact with the back side of the flange 31a of the adjacent girder 31 so that the girder 31 is mutually connected via the key plate 34. It can be fixed.

  The key plate 34 has a taper taper 34a so that the key plate 34 can be easily inserted into the adjacent girders 31, and a rounded edge allows a pre-insertion space.

  The steel H which is the girder 31 has a partition plate-like stiffener 31c, and when it is placed side by side, the flanges 31a overlap each other vertically so that they do not enter and the flanges 31a are arranged flat. A state is obtained.

  In this way, the girder members 31 are sequentially arranged at the road crossing point α, and the edge members 35 formed by stacking the grooved steels are installed in the end direction, and the asphalt pavement is provided on the upper surface of the girder 31 as a temporary pavement. The pavement rub 36 is applied, and the openings on both sides are closed with an opening curing iron plate 38.

  In this way, the upper load is received by the road surface covering with the girder 31 and the open shield machine 1 is dug under it. Road A is a sidewalk and road B is a roadway, and traffic is possible.

  After the open shield machine 1, the concrete box 4 is propelled. For each propulsion of the concrete box 4, one or several girders 31 are removed and replaced with the concrete box 4. A side backfill 37 is applied to the side of the body 4.

  As described above, the concrete box 4 can be constructed without a covering, and can be passed over.

  In accordance with the promotion of the concrete box 4, all the girders 31 at the road crossing point α are removed, and the open shield machine 1 is put into the reaching shaft 13 and collected.

  8 and 9 show a second embodiment of the present invention, in which the girders 31 are installed above the upper floor board of the concrete box 4.

  This embodiment is a case where the concrete box 4 is constructed with a cover, and the installation and removal are facilitated by installing the girders 31 above the upper floor plate of the concrete box 4.

  Thus, even when the girders 31 are installed above the upper floor plate of the concrete box 4, the H steel as the girders 31 protrudes the key plate 34 outward from the end of the flange 31a from the back surface of the flange 31a. It is assumed that the girders 31 can be fixed to each other via the key plate 34 by attaching them to the back side of the flange 31a of the adjacent girders 31.

  Furthermore, as a second example of the second embodiment, other methods can be adopted for fixing the H steels that are the girders 31 to each other. This is shown in FIGS.

  In the second example of the present embodiment, the H steel, which is the girder 31, is continuously laid and arranged side by side with the flange 31 a face up as described above, but the PC steel 41 is penetrated through the web 31 b, and the PC steel The PC steel material 41 is fastened with the fixing metal fitting 42 provided at the end portion of the 41 so as to apply prestress to the entire girder 31 so as to be integrated.

  By connecting the girders 31 with the PC steel 41 and fixing them together in this way, the girders 31 can be stably arranged, and the surfaces of the flanges 31a are arranged side by side and integrated. Sometimes it can be easily removed by removing this binding even when removing one by one.

  In this way, as in the first embodiment, the beam members 31 are sequentially arranged at the road portion crossing point α, and the edge member 35 formed by stacking the grooved steels is installed in the end direction of the beam member 31. A pavement rub 36 by asphalt pavement is applied to the upper surface as temporary pavement.

  In the case of this embodiment, as shown in FIG. 14, the pavement rubbing 36 is completed by laying a steel plate 36a on the upper surface of the girder 31 and applying an asphalt pavement 36b thereon.

  In this way, the upper load is received by the road surface covering with the girder 31 and the open shield machine 1 is dug under it. Road A is a sidewalk and road B is a roadway, and traffic is possible.

  The concrete box 4 is propelled after the open shield machine 1, but in the case of this embodiment, the concrete box 4 has a covering, so that the concrete box 4 can pass thereunder without removing the girder 31. However, as the backfilling of the upper part of the concrete box 4 progresses, the girders 31 are removed one by one or several.

  In accordance with the promotion of the concrete box 4, all the girders 31 at the road crossing point α are removed, and the open shield machine 1 is put into the reaching shaft 13 and collected.

It is a top view of the front process which shows 1st Embodiment of the road surface covering method in the propulsion type open shield method of this invention. It is a top view of the back process which shows 1st Embodiment of the road surface covering method in the propulsion type open shield method of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal side view of a pre-process showing a first embodiment of a road surface covering method in a propulsion type open shield method according to the present invention. It is a vertical process side view of the back process which shows 1st Embodiment of the road surface covering method in the propulsion type open shield method of this invention. It is a vertical front view which shows 1st Embodiment of the road surface covering method in the propulsion type open shield method of this invention. It is an enlarged partial side view of a girder. It is the sectional view on the AA line of FIG. It is a side view of the back process which shows the 1st example of 2nd Embodiment of the road surface covering method in the promotion type open shield method of this invention. It is a vertical front view which shows the 1st example of 2nd Embodiment of the road surface covering method in the propulsion type open shield method of this invention. It is a top view of the previous process which shows the 2nd example of 2nd Embodiment of the road surface covering method in the propulsion type open shield method of this invention. It is a vertical side view of the front process which shows the 2nd example of 2nd Embodiment of the road surface covering method in the promotion type open shield method of this invention. It is a top view of the back process which shows the 2nd example of 2nd Embodiment of the road surface covering method in the propulsion type open shield method of this invention. It is a vertical side view of the post process which shows the 2nd example of 2nd Embodiment of the road surface covering method in the propulsion type open shield method of this invention. It is a vertical front view which shows the 2nd example of 2nd Embodiment of the road surface covering method in the promotion type open shield method of this invention. It is an enlarged partial side view of a girder. It is the BB sectional drawing of FIG. It is a vertical side view which shows the construction condition of a propulsion type open shield method. It is a top view which shows the construction condition of a propulsion type open shield method. It is a vertical side view of an open shield machine used in the propulsion type open shield method. It is a top view of the open shield machine used with a propulsion type open shield construction method. It is a vertical side view of the start-up shaft temporary installation equipment of a propulsion type open shield method. It is a top view of the starting vertical pit temporary installation of a propulsion type open shield method. It is an AA arrow line view of FIG.

DESCRIPTION OF SYMBOLS 1 ... Open shield machine 1a ... Side wall plate 1b ... Bottom plate 3 ... Shield jack 4 ... Concrete box 4a ... Top box 5 ... Backfill 6 ... Excavator 8 ... Starting shaft 13 ... Reaching shaft 14 ... Drain gate 15 ... Press bar 16 ... Slide-type retaining ring 17 ... Sliding jack 18 ... Movable split base 19 ... Bottom jack 20 ... Friction cutter 21 ... Intermediate pushing equipment 22 ... Supporting wall 23 ... Original pushing jack 24 ... Strut 25 ... Stand 26 ... Guide steel 29 ... PC Steel bar 30 ... Towing jack 31 ... Girder 31a ... Flange 31b ... Web 31c ... Stiffener 32 ... Base concrete 33 ... Girder support 34 ... Key plate 34a ... Tapered 35 ... Edge material 36 ... Pavement rub 36a ... Steel plate 36b ... Asphalt Pavement 37 ... Side backfilling 38 ... Opening curing iron plate 39 ... Crushed stone 40 ... Foundation concrete G 41 ... PC steel 42 ... Fixing bracket

Claims (3)

Excavation and excavation of the soil in front of the front or top opening of the open shield machine, the process of extending the propeller jack and using the concrete box as a reaction force to advance the shield machine, and installing the concrete box in the start pit In the propulsion type open shield construction method that repeats the propulsion process of extruding with the original push jack, and arranging and pushing out a new concrete box between the original push jack and the extruded concrete box, H steel is installed on the road surface from the ground as a girder, and the road surface lining is formed side by side with the flange surface facing upward. As a result, the upper load is received, and an open shield machine is dug under it . is to remove one by one or by more present when the concrete a box body propulsion, propulsion type and wherein the propelling concrete box-body The road surface lining method in over Pung shield method.   The road surface lining method in the propulsion type open shield method according to claim 1, wherein the H steel which is a girder is continuous with the flange surface facing side by side and is fastened with a PC steel material penetrating the web.   H steel, which is a girder, is fixed to each other by attaching the key plate from the rear surface of the flange so as to protrude outward from the end of the flange, and abutting it on the back side of the flange of the adjacent girder. The road surface covering method in the propulsion type open shield method according to claim 1.

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