JP3946720B2 - How to bury underground structures - Google Patents

Description

  The present invention relates to an underground structure embedding method in which an underground structure is embedded in a direction crossing the ground, such as under a track or under a road.

  Conventionally, as a method of forming an underground passage by burying an underground structure in a direction crossing the track in the ground under the track, for example, an underground structure buried design area under the track with the track interposed Excavating the start pit and the arrival pit on both sides of the pipe, and press-fitting multiple pipes with edge-cut plates on the upper surface in parallel in the direction intersecting the track in the shallow ground under the track After the pipe roof is formed by pushing the underground structure with a plurality of propulsion jacks from the start pit side, the plurality of pipes are reached by the upper front end surface of the underground structure while excavating the front ground. The underground structure is embedded in the buried design area along the lower surface of the edge cutting plate in a state where the edge cutting plate is left behind (see, for example, Patent Document 1).

On the other hand, instead of the method of burying an underground structure by pressing the propulsion jack, for example, as described in Patent Document 2, a reaction force support wall is built on the pit wall on the arrival mine side, and this reaction force support Attach multiple tow jacks to the wall, and penetrate multiple PC steel wires into the ground of the underground structure embedding design area between the start pit and the arrival pit, and connect the tip of these PC steel wires to the above traction While the jack is inserted and gripped, the base end penetrates the underground structure and is fixed to the rear surface of the underground structure. The underground structure is pulled to the buried design area via the PC steel wire by the pulling force of the towing jack. It is also being buried.
Japanese Patent Laid-Open No. 7-208067 Japanese Patent Publication No.56-125597

  However, in any of the above underground structure embedding methods, in order to advance the underground structure with a propulsion jack or a tow jack alone, respectively, the jacking reaction area of these jacks is used as the underground design area of the underground structure. Therefore, it is necessary to take only the starting mine on the front side or the reaching mine on the rear side, so that the structure of the reaction force support means becomes large, and in particular, the underground structure is pulled by the traction means. As described below, when embedding in a buried design area in the ground, there is a problem that smooth embedding becomes difficult.

  That is, when the tow jack is operated and the underground structure is pulled through the PC steel wire, the PC steel wire is stretched within the elastic range, and the tensile force (traction force) is the coefficient of static friction between the underground structure and earth and sand. In the range that does not exceed the static friction resistance force multiplied by the load acting on the underground structure (mainly earth pressure), the PC steel wire only extends within its elastic range, but the underground structure does not move forward, If the traction force is increased to exceed the static friction resistance, the underground structure will move forward by a certain amount instantly. The underground structure moves forward instantaneously when the underground structure starts to move, the frictional resistance of earth and sand against the underground structure affects the dynamic friction resistance, that is, the dynamic friction coefficient between the underground structure and the earth and sand. This is because it changes to a resistance force multiplied by the load to be applied (mainly earth pressure).

  Since the dynamic friction coefficient is smaller than the static friction coefficient, the dynamic friction resistance becomes smaller than the static friction resistance. Therefore, when the underground structure starts to move, the resistance to the underground structure changes to the dynamic friction resistance, and the PC steel wire corresponds to the static friction resistance force. The movement of the underground structure is stopped by contracting at once from the extension amount corresponding to the traction force to the extension amount corresponding to the traction force corresponding to the dynamic friction resistance force. The reason for stopping is that the traction speed of the traction jack is slower than the contraction speed of the PC steel wire. The amount of forward movement of the underground structure during this period is the difference between the elongation amount of the PC steel wire at the time of static friction resistance and the elongation amount of the PC steel wire at the time of dynamic friction resistance. Then, when the PC steel wire is further pulled from the state where the movement of the underground structure is stopped and the traction force reaches the static frictional resistance force again, the underground structure is instantaneously moved forward again.

  In this way, when the PC steel wire is stretched by the traction force, the traction force is applied to the underground structure, and when the traction force reaches the static friction resistance force, the underground structure is instantaneously advanced by the traction force. Since the traction force decreases and the traction force decreases, the advancement of the underground structure is temporarily stopped, and the traction force is subsequently increased to repeatedly advance the underground structure while extending the PC steel wire. Will be done.

  Such repeated forward and stop behavior of the underground structure due to traction force is intermittently performed many times during the forward distance of about 10cm, which causes the pulsation movement of the underground structure and the PC steel wire. The longer it is, the larger pulsation movement occurs, which not only hinders the smooth burying of underground structures, but also the pulsating movement vibrates the upper part of the underground structure and the surrounding ground, causing the road bed, track, and surrounding houses to It will have an adverse effect.

  The present invention has been made in view of such problems, and the object of the present invention is to provide a reaction force of the traction force when the underground structure is to be buried in the ground such as under a track or under a road. An object of the present invention is to provide an underground structure embedding method capable of reducing the support means in a small scale and smoothly and accurately bury the underground structure without causing almost any pulsation movement.

  In order to achieve the above object, the underground structure embedding method according to the present invention is as described in claim 1, wherein the underground structure is embedded in the ground sandwiched between the start side and the arrival side from the start side. A method of burying in a planned area, wherein the above underground structure is pushed forward with a traction force by a traction means while being pushed with a constant motive force by the propulsion means, and the underground structure only with a traction force It is characterized in that it is embedded in the buried design area while reducing the pulsation movement.

In the above underground structure embedding method, a propulsion jack is used as a propulsion means for the underground structure . On the other hand, as the traction means, the tips of a plurality of PC steel wires are fixed to the reaching side, and these PC steel wires are used. Each of the tow jacks that penetrates the ground and underground structure of the buried design area, protrudes the base end from the rear end surface of the underground structure, and attaches the protruding end of each PC steel wire to the rear end surface of the underground structure It is configured to be pulled by.

Further, in the invention according to claim 2 , when the underground structure is embedded, an edge cutting plate is arranged on the upper surface from the start side to the arrival side at the upper end portion of the buried structure area of the underground structure in the ground. After forming the pipe roof by press-fitting the multiple pipes installed in parallel, the edge cutting plate is left behind while pushing the multiple pipes toward the arrival side with the upper front end surface of the underground structure And embedded in the buried design area along the lower surface of the edge cutting plate.

The invention according to claim 3 is the propulsion means for propelling the underground structure together with the traction when the underground structure is pulled by the traction means, and the static friction resistance before the underground structure moves. It is characterized in that the underground structure is propelled while assisting the traction force by the traction means with a propulsion force that is greater than the difference between the dynamic frictional resistance force when moving.

Further, the invention according to claim 4 provides the propulsive force by the propulsion means to the underground structure with a force greater than the difference between the static friction resistance force before the underground structure moves and the dynamic friction resistance force when the underground structure moves. However, the traction means pulls the underground structure with a force equal to or less than the traction force obtained from the dynamic friction coefficient required to pull the underground structure.

According to a fifth aspect of the present invention, the traction force acts on the underground structure as a force substantially equivalent to the dynamic frictional resistance force when the underground structure moves, while the underground structure moves by the propulsion means. It is characterized in that the underground structure is propelled with a propulsive force greater than the difference between the static frictional resistance before moving and the dynamic frictional resistance when moving.

  According to the first aspect of the present invention, in the method of burying an underground structure from a start side to a buried design area in the ground sandwiched between the start side and the arrival side, the front ground of the underground structure is excavated. However, since the underground structure is pulled toward the arrival side and at the same time the rear end surface of the underground structure is pushed from the start side by the propulsion means, the propulsive force by the propulsion means moves the underground structure. Therefore, it is sufficient if the reaction force support means for the traction force is small-scale, and therefore the preparation of the underground structure can be prepared in a short period of time and economically. In addition, when the underground structure is pulled and embedded in the buried design area, a propulsive force is always given to the underground structure by the propulsion means, so the underground structure is moved forward by the traction force. Not only can the traction force be small, but also the amount of traction means such as PC steel wire when the underground structure moves forward is reduced, which significantly reduces the pulsating movement of the underground structure. Therefore, the underground structure can be smoothly embedded in the buried design area, and the underground structure can be buried without adversely affecting the roadbed, the track, the surrounding houses, and the like.

Since the propulsion jack is adopted as the propulsion means, when pulling the underground structure, by applying a predetermined pressing force to both sides of the lower end of the rear end surface of the underground structure, Therefore, the direction can be easily corrected and can be accurately embedded in the embedded design area. Also, as the traction means, the tip of a plurality of PC steel wires is fixed to the arrival side of the underground structure, and these PC steel wires are penetrated through the ground of the buried design area and the underground structure, and the base end portion thereof is fixed. It is configured to project from the rear end surface of the underground structure, and the projecting end of each PC steel wire is pulled by each towing jack attached to the rear end surface of the underground structure, so the arrival side is the tip of the PC steel wire It is only necessary to provide a reaction force support means that has been fixed, so that not only the reach mine is small and economical, but also the burial work can be prepared efficiently.

  Furthermore, since a plurality of tow jacks are arranged on the rear end surface of the underground structure on the starting side, the amount of tow movement of the underground structure through the PC steel wire depends on the amount of the PC steel wire drawn out. It can be measured directly and accurately, and the deviation of the amount of movement on both sides of the underground structure can be easily and accurately known. Can be embedded in

When the underground structure is embedded in the buried design area under the railway line, as described in claim 2 , the upper surface of the buried structure area of the underground structure in the ground extends from the start side to the arrival side. After the pipe roof is formed by press-fitting a plurality of pipes with edge cutting plates in parallel to each other, the above-mentioned plurality of pipes are pushed toward the arrival side by the upper front end surface of the underground structure, and the edge cutting is performed. If the underground structure is embedded in the buried design area along the lower surface of the edge cut plate with the plate left behind, the underground structure can be accurately moved along the lower surface of the edge cut plate without any change in the upper ground of the buried design area. Can be buried.

According to the invention of claim 4 , when the underground structure is pulled by the pulling means, the propulsive force of the propulsion means including the propulsion jack is applied to the earth and sand against the underground structure immediately before the underground structure moves. The traction force obtained from the dynamic friction coefficient required to pull the underground structure while applying it to the underground structure with a force greater than the difference between the static friction resistance force of the soil and the dynamic friction resistance force of earth and sand etc. to the underground structure when moving Since the underground structure is towed, the underground structure can be smoothly advanced by the extension amount of the propulsion jack without pulsation, and the elongation of the PC steel wire in the meantime can be extended by the force below the dynamic friction resistance. The underground structure can be smoothly and accurately embedded in the buried design area while reducing the pulsation movement of the underground structure by suppressing the extension amount.

According to the invention according to claim 5 , while the traction force by the traction means is applied to the underground structure as a force substantially equivalent to the dynamic friction resistance force such as earth and sand against the underground structure when the underground structure moves , The underground structure is propelled by a propulsive force that is greater than the difference between the static frictional resistance force of earth and sand to the underground structure just before the underground structure moves by the propulsion means and the dynamic friction resistance force of earth and sand to the underground structure when moving. Therefore, the actual movement of the underground structure can be moved only by the propulsion amount of the propulsion means, and the underground structure can be buried smoothly and accurately.

  A specific embodiment of the present invention will be described with reference to the drawings. When a prefabricated underground structure 2 is embedded in the lower ground of the track 1 in a direction crossing the track 1, first, one side of the track 1 is sandwiched. The starting side 3 of the underground structure 2 is formed on the side, and the arrival side 4 of the underground structure 2 is formed on the other side. In this case, the start side 3 and the arrival side 4 are formed by excavating a shaft, but the arrangement of the underground structure 2 and the buried design area 5 of the underground structure 2 in the lower ground of the track 1 will be described later. If there is a space in which the pipe roof forming steel square pipe 6a can be placed and removed, there is no need to excavate and form a shaft. 7a and 7b are earth retaining sheet piles that are vertically built along both wall surfaces facing the start side 3 and the arrival side 4 in the buried design area 5.

  After the space between the start side 3 and the arrival side 4 is formed, the center and both side corners of the lower floor 2a of the underground structure 2 in the buried design area 5 of the underground structure 2 are embedded in FIG. As shown in the drawing, a guide member 8a having an appropriate width with a flat upper surface supporting the lower surface of the lower floor portion 2a of the underground structure 2 and an L-shaped cross section supporting both side corners of the lower floor portion 2a. A guide member 8b, 8b is provided between the starting side 3 and the reaching side 4 so as to penetrate therethrough. These guide members 8a and 8b are formed by excavating a small-diameter guide shaft between the start side 3 and the arrival side 4 and placing concrete in the guide hole. Further, another guide member 8c having a flat upper surface is laid on the ground surface of the start side 3 so as to be continuous with the guide members 8a and 8b. In addition, when the ground of the buried design area 5 is stable or when a small-scale underground structure is constructed, these horizontal guide members 8a and 8b may not be necessarily required.

  Further, along with the formation of the guide members 8a and 8b, the height of the upper floor 2b of the underground structure 2 in the buried design area 5, that is, the planned position of embedding of the upper floor 2b having a shallow earth covering, from the steel plate on the upper surface. A large number of square steel pipes 6a each having a flat strip-shaped edge cutting plate 9 are placed in parallel through the earth retaining sheet piles 7a and 7b built from the starting side 3 to the reaching side 4. The puff roof 6 having the same width as the underground structure 2 is formed by press-fitting and embedding in the state. It should be noted that the embedding operation of these square pipes 6a is performed while excavating the ground in front using an auger screw disposed therein, as is well known. At this time, the front end of the edge cut plate 9 placed on the square pipe 6a is buried in a state of being integrally fixed to the front end of the square pipe 6a by welding or the like, and after the pipe roof 6 is formed, the fixed portion is cut off. The rear end of the edge cutting plate 9 is fixed to an appropriate fixed point on the starting side 3 so that the edge cutting plate 9 is fixed. Also, side retaining steel pipes 6b, 6b along the both side walls of the underground structure 2 to be embedded as needed from the square pipes 6a, 6a on both ends of the pipe roof 6 are embedded in the vertical direction in parallel. Keep it.

  As described above, the pipe roof 6 is embedded in the ground with a shallow earth covering in the underground structure embedding design area 5 under the track, and the guide members 8a and 8b are formed in the ground below the ground, and then laid on the start side 3. The ready-made underground structure 2 is installed on the guide member 8c, and the underground structure 2 is pulled toward the arrival side 4 to be embedded in the buried design area 5 under the track. And a propulsion means 11 for pressing the rear end surface of the underground structure 2 on the starting side. The underground structure 2 may be carried into the start side 3 from the outside of the start side 3, or may be constructed by assembling a formwork and placing concrete in the start side 3. A cutting edge 15 for excavating the front ground is attached to the opening front end of the underground structure 2.

  The traction means 10 includes a plurality of PC steel wires 10a arranged in a state where a plurality of traction means 10 are provided in the upper and lower portions of the center portion and both side portions of the underground structure 2 and the end portions thereof penetrate the underground structure 2 in the front-rear direction. And a tow jack 10b made of a center hole jack that pulls each PC steel wire 10a, and the tips of all the PC steel wires 10a are fixed to the pit wall facing the earth retaining sheet pile 7b on the arrival side 4. These PC steel wires are pulled out to the start side 3 through the ground of the buried design area 5 and further penetrated through the underground structure 2 and then the base end portion is underground. The traction jack 10b, which is fixed in a state where it is in contact with the rear end surface of the structure 2 and penetrates the support member 13 in a state where the front end surface is in contact with the support member 13, can be expanded and contracted. It is inserted through a rod body (not shown) having a gripping portion.

  In addition, although all the PC steel wires 10a may be inserted through the central portion and both end portions in the upper and lower portions of the hollow interior of the underground structure 2, when passing through the wall portion of the underground structure 2, When the underground structure 2 is constructed, a sheath tube is provided at the place where the PC steel wire 10a is provided, and is embedded in the wall body so as to penetrate between the front and rear end faces. Sometimes a PC steel wire may be inserted through the sheath tube.

  On the other hand, the propulsion means 11 includes two propulsion jacks 11a that press both sides of the lower end of the underground structure 2, and reaction force receiving members 11b of these propulsion jacks 11a. The propulsion jack 11a receives the reaction force at its rear end. The reaction force receiving member 11b is fixed on the starting base 14 or the guide member 8c, which is laid on the ground surface of the starting side 3, by a fixing tool such as a bolt. . Each time the underground structure 2 moves forward by a certain length, a spacer member 11c having a thickness corresponding to the moving amount is interposed between the rear end face of the propulsion jack 11a and the reaction force receiving member 11b. is doing. Each time the underground structure 2 moves forward, the reaction force receiving member 11b receiving the propulsion jack 11a is moved forward on the horizontal start table 14 or the guide member 8c according to the amount of advancement. You may comprise so that it may fix on the horizontal start stand 14 or the guide member 8c in the position. The number of propulsion jacks 11a is not limited to two, and the number of bases can be increased as appropriate.

  Next, a method of burying construction in the buried design area 5 below the track 1 by pulling the underground structure 2 installed on the start side 3 side toward the arrival side 4 by the traction means 10 will be described. First, after cutting away the part of the earth retaining sheet pile 7a on the starting side 3 that faces the front end face of the underground structure 2, the front end face of the upper floor 2b of the underground structure 2 is connected to a plurality of pipes below the edge plate 9 6a is brought into contact with the rear end surface, and from this state, the propulsion jacks 11a and 11a are used to press both lower portions of the rear end surface of the underground structure 2 with a constant propulsion force and simultaneously operate all the traction jacks 10b. Thus, the underground structure 2 is pushed forward and buried in the buried design area 5.

  At this time, the front ground of the underground structure 2 surrounded by the blade 15 attached to the front end opening of the underground structure 2 in advance is only a certain length using an appropriate excavator (not shown). After the excavation, the propulsion jack 11a and the traction jack 10b are operated as described above to move the underground structure 2 forward along the lower surface of the edge cutting plate 9 into the space portion of the excavation site. When the underground structure 2 moves forward, a plurality of pipes 6a (pipe rows) are pushed forward on the front end surface of the underground structure 2, but when the underground structure 2 moves forward, the plurality of pipes 6a are pushed directly. Although it is necessary to increase the propulsive force of the propulsion jack 11a and the traction force of the traction jack 10b, the front end surface of the upper floor 2b of the underground structure 2 and the plurality of pipes 6a are not shown on the upper surface of the blade 15 (not shown). A plurality of pipe propulsion jacks are juxtaposed between the end face and the propulsion reaction force is supported on the front end face of the underground structure 2 before the underground structure 2 is moved forward by a certain length. It is preferable that each pipe 6a is pushed forward by a certain length by extending the pipe propulsion jack.

  In addition, the excavated earth and sand are discharged to the start side 3 through the inside of the underground structure 2, while on the arrival side 4, the square pipe 6 a constituting the pipe roof 6 that is pushed out as the underground structure 2 moves forward. Cut or remove the connection. When the underground structure 2 is embedded in the ground of the fixed design area 5 with a certain length, the propulsion jacks 11a and 11a of the propulsion means 11 are contracted and the rear end surfaces of the propulsion jacks 11a and 11a and the reaction force receiving member 11b While a new spacer member 11c is interposed between the pipes 6a, the pipes 6a are pushed forward by a certain length and excavated for a certain length in front of the underground structure 2, and then the propulsion jack 11a and the traction jack 10b are operated again. As shown in FIG. 3, the underground structure 2 is moved forward and embedded in the ground of the buried design area 5.

  In this way, each pipe 6a is pushed by a certain length and the process of excavating the front ground of the underground structure 2 by a certain length and the propulsion jack 11a and the traction jack 10b are operated to make the underground structure 2 a certain length. By repeating the process of moving forward into the ground of the buried design area 5, the underground structure 2 is buried in the buried design area 5 and an underground passage is built. At this time, the underground structure 2 is moved forward by a single extension amount of the propulsion jack 11a. The propulsive force of the propulsion jack 11a assists the traction force of the tow jack 10b that pulls the underground structure 2. The underground structure 2 does not move forward only by the propulsion force of the propulsion jack 11a, and the underground structure 2 is applied by the traction force of the traction jack 10b while applying the propulsion force forward to the underground structure 2. Is moved forward.

The behavior of the underground structure 2 during forward movement will be described with reference to FIGS. In these drawings, the X axis indicates the traction time, and the Y axis indicates the amount of movement of the underground structure 2. FIG. 5 shows the behavior when the underground structure 2 is pulled and moved only by the traction force of the traction jack 10b. When the underground structure 2 is pulled through the PC steel wire 10a, the PC steel wire increases as the traction force increases. 10a gradually expands within the elastic range, and the traction force is the static friction resistance force obtained by multiplying the static friction coefficient between the underground structure 2 and earth and sand by the load (mainly earth pressure) acting on the underground structure 2. When the static frictional resistance of earth and sand against the object is reached, the PC steel wire 10a pulls the underground structure 2 in a state where the maximum amount of elongation according to the traction force is reached. From this state, the traction force exceeds the static frictional resistance. Then, the underground structure 2 moves forward instantaneously by a certain amount. When this forward movement starts, the frictional resistance force between the underground structure 2 and the earth and sand changes to the dynamic frictional resistance force , and the PC steel wire 10a changes from the extension amount corresponding to the traction force corresponding to the static frictional resistance force to the dynamic frictional resistance force. The movement of the underground structure 2 is stopped by contracting at a stretch to the extension amount corresponding to the corresponding traction force.

  The amount of forward movement of the underground structure 2 during this period is the difference between the amount of extension of the PC steel wire 10a at the time of static friction resistance and the amount of extension of the PC steel wire 10a at the time of dynamic friction resistance. The underground structure 2 is continuously pulled through the PC steel wire 10a with the traction force of the PC, and therefore, the PC steel wire 10a is stretched again from a certain amount of contraction and reaches a traction force exceeding the static friction resistance force, The underground structure 2 is again moved forward in an instant. Thus, during one traction operation of the traction jack 10b, the traction force is applied to the underground structure 2 while the PC steel wire 10a is extended by the traction force, and the traction force exceeds the static friction resistance force. The operation of advancing 2 instantaneously with its traction force and the operation of temporarily stopping the advancement of the underground structure 2 due to the decrease in the traction force due to a decrease in the amount of extension of the PC steel wire 10a due to this advancement are repeated many times. This is the pulsation movement of the underground structure 2 as shown by the stair-like zigzag line in FIG. And the pulsation movement of this underground structure 2 will become so large that the PC steel wire 10a is long.

  In FIG. 5, the thick line and the thin line indicate the movement state of one half part and the other half part of the underground structure 2 in the width direction, that is, the left side and the right side. In other words, the pulsation is moved while changing the direction of the embedding direction in the embedding design area 5 in the left-right direction.

  FIG. 6 shows the behavior of the underground structure 2 when the propulsion jacks 11a, 11a are combined with the traction force of the traction jack 10b in the above embodiment of the present invention when the underground structure 2 moves forward. When pulling the underground structure 2 via the line 10a, the underground structure 2 is always pressed with a constant pressing force (propulsive force) by the propulsion jacks 11a, 11a of the propulsion means 11. The traction force of the traction jack 10b is reduced by a force corresponding to the above, and the underground structure 2 is moved forward by the traction force. Accordingly, the extension amount of the PC steel wire 10a until the underground structure 2 overcomes the static frictional resistance and moves forward is suppressed and shortened, and the underground structure 2 can be moved forward with a slight extension amount. Even if the PC steel wire 10a contracts due to the movement, the base structure 2 can be embedded in the embedded design area 5 while reducing the occurrence of pulsating movement immediately after reaching a predetermined traction force by just contracting slightly. .

  At this time, the PC steel wire 10a has a traction force obtained from the kinetic friction coefficient required for traction of the underground structure 2 and, specifically, a traction force substantially equal to or less than the kinetic friction resistance force. While pulling the underground structure 2 through the ground, the sum of the propulsive forces of the propulsion jacks 11a on both sides is equal to or greater than the difference between the static friction resistance force before the underground structure 2 moves forward and the dynamic friction resistance force when the underground structure 2 moves forward By constantly adding to the underground structure 2 with the force of the underground structure, the underground structure 2 overcomes the static friction resistance force and moves forward, and the traction force by all the traction jacks 10b is always equal to or less than the kinetic friction resistance force. Able to continuously move forward by a length corresponding to the extension amount of the propulsion jack 11a at a substantially constant speed without pulsating movement while pulling the underground structure 2 with force. There can be promoted accurately the exact direction in which the moving amount of the left and right sides of the underground structure 2 is overlapped, as shown in FIG.

  Further, the forward movement amount of the underground structure 2 can be measured and managed in real time from the extension amount of the propulsion jacks 11a and 11a, and these propulsion jacks 11a and 11a are located on both the left and right sides of the rear end surface of the underground structure 2. It is possible to check the amount of left and right movement of the underground structure 2 at the same time, and if the underground structure 2 is displaced in the left and right direction while the underground structure 2 is moving, both propulsion By adjusting the propulsive force of the jacks 11a and 11a and pushing the underground structure 2 while correcting the direction to the predetermined embedding direction, the amount of movement of the left and right sides of the underground structure 2 is reduced as shown in FIG. It is possible to embed with high accuracy in the overlapped and accurate direction. When the front end of the underground structure 2 reaches the arrival side 4, the earth retaining sheet pile 7 b on the arrival side 4 is removed, and a passage that connects the start side 3 and the arrival side 4 through the underground structure 2 is formed.

  In the above embodiment, the tip of the PC steel wire 10a of the traction means 10 is opposed to the earth retaining sheet pile 7b built on the arrival side 4 of the buried design area 5 and the front of the earth retaining sheet pile 7b. It is connected to and supported by the fixing tool 12 fixed to the pit wall through the space between the pit walls. As shown in FIG. 4, the earth retaining sheet pile 7b built on the arrival side 4 is moved forward. In the case where the ground exists, a groove 16 is excavated in the ground portion having a predetermined length interval from the earth retaining sheet pile 7b forward, and the fixing tool 12 is interposed on the rear side wall surface of the groove 16 via a bearing material. And fixing the tip of the PC steel wire 10a penetrated into the front ground of the earth retaining sheet pile 7b to the fixing tool 12 to support the underground structure 2 with the ground as a reaction force receiving ground. You may comprise so that it may be pulled and embedded. Since other configurations are the same as those in the above-described embodiment, the same portions are denoted by the same reference numerals and detailed description thereof is omitted. Moreover, since the burying method of the underground structure 2 is the same, the description thereof is also omitted.

The simple vertical side view which shows the installation state at the time of embedding an underground structure in a buried design area. The simplified longitudinal cross-sectional view of the back side of the underground structure. The simplified vertical side view which shows the state which has embed | buried an underground structure in a buried design area. The simplified vertical side view which shows another embodiment of this invention. The diagram which shows the construction result only by traction force. The diagram which shows the construction result by combined use of tractive force and propulsive force.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Track 2 Underground structure 3 Starting side 4 Arrival side 5 Buried design area 6 Pipe roof 9 Edge cutting board
10 Towing means
10a PC steel wire
10b towing jack
11 Propulsion means
11a propulsion jack

Claims (5)

When the underground structure is buried from the start side to the buried design area in the ground sandwiched between the start side and the arrival side, the process of excavating the front ground of the underground structure for a certain length, and the underground structure It is a method of embedding in the buried design area by repeatedly performing a step of moving forward in the ground of the buried design area by a certain length with a traction force by the traction means while constantly pressing with a certain pushing force by the pushing means. The propulsion means comprises a propulsion jack that presses the rear end face of the underground structure, while the traction means fixes the ends of a plurality of PC steel wires on the reaching side, and these PC steel wires are embedded in the ground of the buried design area and The base structure penetrates the underground structure and protrudes from the rear end face of the underground structure, and the protruding end of each PC steel wire is pulled by each tow jack attached to the rear end face of the underground structure. Tetanari Buried plan area while reducing pulsation movement of underground structures only by traction by suppressing the elongation of PC steel wires during auxiliary to pulling by thrust propulsion jacks traction traction jack for pulling the underground construction A method for burying underground structures, characterized in that it is buried in the ground. After the pipe roof is formed by press-fitting multiple pipes with edge cutting plates on the upper surface from the start side to the arrival side in parallel at the upper end of the buried design area of the underground structure in the ground The underground structure according to claim 1, wherein the underground structure is embedded in the buried design area along the lower surface of the edge cutting plate while extruding a plurality of pipes to the arrival side with the edge cutting plate remaining. How to bury structures. Claim propulsion by propulsion means, characterized in that it is applied to the underground construction with the difference more than the force of the dynamic friction resistance force when moving the previous static friction resistance force underground construction is moved 1 Method for burying underground structures as described in 1. Towing the underground structure by the traction means while applying the propulsive force by the propulsion means to the underground structure with a force greater than the difference between the static friction resistance force before moving the underground structure and the dynamic friction resistance force when moving. 2. The underground structure embedding method according to claim 1, wherein the underground structure is pulled with a force equal to or less than a traction force obtained from a dynamic friction coefficient necessary for the operation. The traction force is applied to the underground structure as a force substantially equivalent to the kinetic frictional resistance force when the underground structure moves, while the traction force by the traction means moves with the static friction resistance force before the underground structure moves. 2. The underground structure embedding method according to claim 1 , wherein the underground structure is propelled with a propulsive force greater than a difference from the dynamic frictional resistance force at the time.

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