JP2005248546A - Construction method of underpass structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method of an underpass structure capable of shortening a construction period. <P>SOLUTION: A square-shaped jacking machine 16 capable of excavating an approximately square cross section is used for construction of the underpass structure, and a box body 20 having the similar cross section as the square cross section excavated by the jacking machine 16 is also used. The jacking machines 16 used in the case of forming a shell body 22 of the structure is formed into a unit of connected jacking machine by connecting a plurality of the jacking machines 16 each having the same constitution. In this case, the shell body 22 is constituted of a unit of the six connected jacking machines located in the central part of the upper and lower sides in the horizontal direction, a unit of reversed L-shape connected jacking machines comprising two connected jacking machines in the vertical direction and three connected jacking machines in horizontal direction and a unit of the three connected jacking machine located in the central part of both right and left sides in the vertical direction. The box body 20 is constituted of a square cylindrical body of approximately the same square cross section as that of the drum sections 16a to 16c of the jacking machine 16, and the box body 20 is set as box body blocks 200 to 202 adjusted to a connection state of the connected jacking machines 160 to 161 formed by connecting a plurality of the jacking machines 16. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for constructing an underpass structure constructed so as to intersect with a lower ground of a road or a railway.

  When building an underpass structure with a large cross-section in the ground below the road or railway by the non-open cutting method, the shield method, box propulsion / box pulling method, element propulsion / traction method Etc. are adopted.

  For this type of structure, it is generally advantageous to make the depth at the intersection as shallow as possible and to shorten the extension of the approach part. For this reason, element propulsion and traction methods are usually used frequently. It was.

  An example of this type of construction method is disclosed in Patent Document 1. The construction method disclosed in Patent Document 1 uses a propulsion device to excavate a tunnel from a ground excavation start point to a ground excavation end point so as to pass through a lower region of a specific ground side facility, The gist is to install a box having a cross-sectional shape corresponding to the tunnel cross section in the excavated tunnel. By installing a plurality of boxes adjacent to each other, an underpass structure having a rectangular cross section is constructed.

The construction method disclosed in Patent Document 1 does not require starting and reaching shafts, but has the following problems.
JP 2003-120169 A

  That is, in the construction method disclosed in Patent Document 1, when a box is installed one by one by a propulsion unit and an underpass structure is constructed, a plurality of boxes are connected to each other. There was a problem of becoming.

  This invention is made | formed in view of such a conventional problem, The place made into the objective is to provide the construction method of the underpass structure which can shorten a construction period.

  In order to achieve the above object, the present invention bypasses the lower ground of ground facilities such as roads and railroads, and constructs an underpass structure in which both ends reach the ground. A starting shaft is provided on one end side of the planned construction site, a reaching shaft is provided on the other end side, the propulsion device is propelled from the starting shaft to the reaching shaft, and a box is sequentially installed behind it. A step of forming an outer shell of the underpass structure having a closed cross-sectional shape, and a step of excavating an inside surrounded by the box to form the underpass structure after forming the outer shell. When forming the outer shell body, the plurality of propulsion units are connected to form a connection unit propulsion unit, and the propulsion units of the connection unit propulsion unit are propelled substantially simultaneously. The box is Depending on the connection state of the serial connection unit propulsion unit, the connecting unit propulsion unit and the outer shape was made to the box body block such that substantially the same.

  According to the construction method of the underpass structure configured in this way, when forming the outer shell, a plurality of propulsion units are connected to form a connected unit propulsion unit, and each propulsion unit of the connected unit propulsion unit is substantially While the box is propelled at the same time, the box is a box block whose outer shape is approximately the same as the connected unit propulsion unit according to the connection state of the connected unit propulsion unit. The construction efficiency is also improved.

  The outer shell can be formed in a rectangular cross section by connecting a plurality of box blocks adjacent to each other in the vertical and horizontal directions and connecting the ends.

  The propulsion unit has an outer shape with a substantially square cross section, and the box block interconnects unit boxes having substantially the same shape as the cross-sectional shape of the propulsion unit, so that the outer shape is substantially the same as the connection unit propulsion unit. Can be formed.

  The connecting unit propulsion unit includes an L-shaped or inverted L-shaped connecting unit propulsion unit disposed at a corner of the rectangular outer shell body, and a straight line disposed at a horizontal or vertical portion of the rectangular outer shell body. It is possible to configure the connecting unit propulsion unit.

  The connecting portion between the box blocks can be set at a position where the absolute value of the bending moment of the outer shell body is substantially minimum.

  The connecting unit propulsion device can be provided with a folding mechanism capable of direction control.

  The connecting unit propulsion device may be provided with an intermediate push jack for individually controlling the propulsion of each propulsion device.

  The connection unit propulsion unit may include a connection unit propulsion unit having a convex or reverse convex cross section disposed in a partition wall provided in the middle of the rectangular outer shell.

  According to the construction method of an underpass structure concerning the present invention, construction efficiency improves and construction time can be shortened.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings.

  1 to 13 show an embodiment of a method for constructing an underpass structure according to the present invention. The construction method of the underpass structure shown in these drawings is a method of constructing the underpass structure 10 that bypasses the lower ground of ground facilities such as roads and railroads, and that both ends reach the ground.

  In the case of the present embodiment, the underpass structure 10 has a closed rectangular cross section as shown in FIGS. 2 and 3. When constructing such an underpass structure 10, As shown in FIG. 1, a start shaft 12 is provided on one end side at a planned construction site of the underpass structure 10, and a reaching shaft 14 is constructed on the other end side.

  The start and reach shafts 12 and 14 are provided at a relatively shallow depth in the ground using earth retaining materials. A start frame 18 for the propulsion device 16 is provided in the start shaft 12, and the propulsion device 16 is propelled from the start frame 18 toward the reaching shaft 14, and at this time, the box 20 is sequentially provided behind the propulsion device 16. To form the outer shell 22 of the closed underpass structure 10 having a rectangular cross section.

  The outer shell body 22 is inclined downward from the starting shaft 12 by a predetermined angle, continuously from the inclined portion, substantially parallel to the ground surface, and continuously parallel to the parallel portion. And it is formed from the upper inclination part which reaches the reaching shaft 14.

  When the outer shell body 22 having such a shape is formed, the inside of the outer shell body 22 is then excavated, and a curable filler such as concrete is injected into the box 22 to form the underpass structure 10. Is built.

  In forming the outer shell body 22, in this embodiment, the propulsion unit 16 is a square propulsion unit capable of excavation having a substantially square cross-section, and the box 20 is also a single propulsion unit. A single box having a square cross-section having a predetermined length and a square cross-section excavated by the machine 16 is used. The construction method of the underpass structure 10 as described above has substantially the same configuration as that of the conventional method, but the construction method of the present embodiment has remarkable features in the following points.

  That is, first, the propulsion unit 16 used when forming the outer shell body 22 is connected unit propulsion units 160 to 161 by connecting a plurality of propulsion units 16 having the same configuration. In the case of the present embodiment, the outer shell body 22 having a rectangular cross section shown in FIG. 2 is replaced with a six-connection unit propulsion device 160 (horizontal of the outer shell body 22 shown in FIG. And the reverse L-shaped unit propulsion unit 161 (shown in FIG. 2), which is located on both sides and is connected three in the horizontal direction and two connected in the vertical direction. The outer shape of the outer shell body 22 is the same as that shown by hatching), and three connected propulsion units located in the center of the left and right sides in the vertical direction (in the vertical direction of the outer shell body 22 shown in FIG. 2) The external shape is the same as that shown in white).

  In the inverted L-shaped connecting unit propulsion device 161, the positions of the three horizontal connections are different at the left and right ends of the outer shell body 22, but the connection structure is substantially the same. Shown on behalf of things.

  In addition, since the three-connection unit propulsion unit is different from the six-connection unit propulsion unit 160 only in the number of connections and other configurations are the same, illustration and description are omitted in the following description.

  4 to 7 show details of the six-connection unit propulsion device 160. FIG. Each propulsion unit 16 constituting the 6-link unit propulsion unit 160 shown in these drawings has substantially the same configuration, and details thereof are shown in FIG.

  The propulsion device 16 shown in the figure includes front, middle, and rear trunk portions 16a, 16b, and 16c having both ends opened in a square section. The front barrel portion 16a has a drilling bit that is rotationally driven in a swiveling state. 16d is provided, and a rotary drive motor 16e is connected to the excavation bit 16d.

  Between the front barrel portion 16a and the middle barrel portion 16b, a middle folding jack 16f for controlling the direction (this and a coupling portion between the front and middle barrel portions 16a and 16b constitute a middle folding mechanism). Is provided. Although only one half-folded jack 16f is shown in FIG. 8, in reality, a plurality of the jacks 16f are provided along the circumferential direction.

  The middle folding jack 16f moves the front trunk portion 16a of the propulsion unit 16 in the vertical (left and right) direction as shown in FIG. 7 by appropriately adjusting a plurality of jack strokes provided along the circumferential direction. Thus, the direction of the six-coupled unit propulsion device 160 can be adjusted.

  An example of the direction control by the half-turn jack 16f will be described. In the case of the present embodiment, the outer shell body 22 has a portion inclined downward from the start shaft 12 by a predetermined angle, and the ground surface is substantially continuous with the inclined portion. Since it is formed from a parallel part and an upwardly inclined part that continues to the parallel part and inclines upward and reaches the reaching shaft 14, the downwardly inclined part is at the right end of FIG. As shown, the front end side (front body portion 16a) of the propulsion device 160 is tilted downward according to the downward tilt angle.

  Further, in the parallel portion, the tip side (front trunk portion 16a) of the propulsion device 160 is kept horizontal, and in the upper inclined portion reaching the reaching shaft 14, as shown at the left end of FIG. The side (front body portion 16a) is controlled to be inclined upward according to the upward inclination angle. By controlling in this way, the entire 6-link unit propulsion device 160 can be directed vertically.

  In the direction control of the 6-connection unit propulsion device 160 by the bent jack 16f, for example, as shown in FIG. 7, the front trunk portion 16a of the propulsion device 16 at both ends is adjusted and moved up and down, thereby The rolling adjustment of the unit propulsion device 160 can also be performed.

  Further, a communication pipe (soil discharging gate) 16g is provided between the front trunk portion 16a and the middle trunk portion 16b so as to communicate with each other and take excavated earth and sand into the middle trunk portion 16b. Furthermore, the middle trunk | drum 16b provided with the follower pipe and the working pipe is provided with a mud pipe 16h for discharging excavated earth and sand.

  Further, a side cutter 16i is provided on the side surface of the middle body portion 16b so as to project the sand outside the side surface. In the six-link unit propulsion unit 160, the side cutter 16i is disposed only on the vertical direction of each propulsion unit 16 and the outer side of either the left or right of the pair of propulsion units 16 provided at both ends in the lateral direction. Has been.

  Further, the rear trunk portion 16c is a double-pipe-type expansion / contraction tube, and an intermediate push jack 16j for propelling each propulsion unit 16 forward is installed inside the expansion / contraction tube. A plurality of intermediate push jacks 16j are installed corresponding to the four corners of the rectangular rear trunk portion 16c, the front end side is fixed to the outer tube of the telescopic tube, and the rear end side is fixed to the inner tube of the telescopic tube. .

  On the other hand, the starting stand 18 shown in FIG. 1 includes an inclined base portion 18a inclined at a predetermined angle, a reaction force receiving portion 18b orthogonal to the inclined base portion 18a, and a main pushing jack 18c. Is placed on the inclined pedestal 18a so that the rear end is in contact with the reaction force receiving portion 18b.

  When constructing the underpass structure 10, the connecting unit propulsion devices 160 and 161 are placed on the inclined base portion 18a, and are also propelled and moved from the rear end side by the main pushing jack 18c.

  When the main jack 18c is driven to extend and the connecting unit propulsion units 160 and 161 are moved forward by a length corresponding to the jack stroke, the jack 18c is contracted to connect the connecting unit propulsion units 160 and 161. Since the box 20 is inserted and installed in this space and the operation of extending and driving the main push jack 18c again is repeated, the connecting unit propulsion devices 160 and 161 are directed toward the reaching shaft 14 side. Promote.

  At this time, the excavator 16d of each propulsion unit 16 is rotationally driven to excavate the earth and sand in front of the front trunk part 16a and take it into the interior, and the taken earth and sand are sequentially transferred to the rear trunk part 16c side. And then discharged to the outside.

  In the course of such propulsion operation, the middle push jack 16j of this embodiment is used when controlling the propulsion direction of the connecting unit propulsion units 160 and 161 as shown in FIG.

  When the connecting unit propulsion units 160 and 161 are bent sideways, as shown in FIG. 4A, the mutual interference between the front trunk portions 16a of the adjacent propulsion units 16 can be achieved only by adjusting the folding jack 16f. Occur.

  Therefore, in the present embodiment, as shown in FIG. 5B, by adjusting the extension stroke of each intermediate push jack 16j, the middle jack 16f is extended to avoid the interference between the propulsion units 16 and the curve. The propulsion unit 16 is adjusted to the state.

  9 to 11 show the details of the inverted L-shaped connecting unit propulsion device 161. In the connecting unit propulsion device 161 shown in these drawings, three propulsion devices 16 are connected in the horizontal direction. Although the two propulsion units 16 are connected in the vertical direction, the configuration of the propulsion unit 16 is substantially the same as that of the above-described six-connection unit propulsion unit 160, and thus the description thereof is omitted.

  Further, the shape of the outer shell shown in the present embodiment is not necessarily limited to the rectangular shape shown in FIG. 2. For example, as shown in FIG. 15, the outer shell 22 ′ having a partition wall 23 at the center portion. It may be. When constructing the underpass structure having such a shape, the connecting unit propulsion unit has a convex or reverse convex cross section as shown by hatching in FIG. 15 in addition to the propulsion units 160 and 161 described above. A connected unit propulsion device may be used.

  The box 20 is composed of a hollow rectangular tube having a square section substantially the same as the body portions 16a to 16c of the propulsion unit 16, and in the case of the present embodiment, a connected unit propulsion in which a plurality of propulsion units 16 are connected. According to the connection state of the machines 160 and 161, they are installed as a plurality of types of box blocks whose outer shape is substantially the same as the connection unit propulsion machines 160 and 161.

  In other words, in the case of the present embodiment, the connection unit propulsion units 160 and 161 are configured such that the outer shell body 22 having a rectangular cross-sectional shape is connected to the six connection unit propulsion units 160 positioned at the center of the upper and lower sides in the horizontal direction. And an L-shaped connecting unit propulsion unit 161 that is two-connected in the horizontal direction and three-connected in the vertical direction, and a three-linked propulsion unit 162 that is positioned at the center of the left and right sides in the vertical direction. Accordingly, the box blocks are also made into a six-connected box block 200, an inverted L-shaped box box 201, and a three-connected box block 202 as shown in FIG.

  The box blocks 200 to 202 having such a shape are formed in a required shape by fixing a plurality of boxes 20 by welding or the like in advance, and the rear side of the box blocks 200 to 202 is formed by propulsion of the connecting unit propulsion units 160 to 162. Will be installed sequentially.

  In this case, each box block 200 to 202 does not necessarily have a structure in which the single boxes 20 are connected. If the outer shape is substantially the same as each connected unit propulsion device 160, 161, A partition wall or a truss structure may be provided.

  In this case, the propulsion units 16 of the connection unit propulsion units 160 to 162 are propelled almost simultaneously, thereby securing the installation space for the box blocks 200 to 202.

  The installed box blocks 200 to 202 are connected to each other by a connecting structure 23 shown in FIGS. 13 and 14 to form an outer shell 22. In the connection structure 23 shown in these drawings, a cylindrical body 24 having a C-shaped cross section provided with a slit-like opening at one end is protruded and fixed on the upper and lower ends of one box block 200 to 202 to be connected. Projections 26 to be inserted into the cylindrical body 24 through slit openings are provided at the upper and lower ends of the box blocks 200 to 202.

  A spherical body 28 having a diameter larger than the slit opening of the cylindrical body 24 is fixed to the tip of the projection 26, and when the projection 26 is inserted into the cylindrical body through the slit opening of the cylindrical body 24 from the axial direction, Since the sphere 28 is provided, the box 20 is prevented from coming out in the lateral direction (width direction).

  When the protrusions 26 are inserted into the cylindrical body 24 and connected to each other, a plurality of bolts and nuts 30 are mounted between the boxes 20, and the connection between the boxes 20 is fixed. For this purpose, the filling mortar 32 is injected and solidified to strengthen the connection between the boxes 20.

  In the case of the present embodiment, the connection position between the connection unit boxes 200 to 202 becomes the minimum position (value 0) of the bending moment in the horizontal and vertical directions of the outer shell 22 as shown in FIG. Is set. When the connection position is set at such a place, the connection structure 23 is avoided from being a structural weak point, and the connection structure can be simplified.

  FIG. 3 shows an example in which the bending moment of the outer shell body 22 is calculated by changing the design conditions such as covering, and in the example shown in FIG. The connection position between the boxes 200 to 202 is set almost at a position where the bending moment becomes 0, but in the vertical portion of the outer shell 22, it is set at a position where the absolute value of the bending moment is almost minimized. Therefore, the above-described effects can be obtained even at the connecting position under such conditions.

  When the connection unit propulsion devices 160 to 162 are propelled and the connection unit boxes 200 to 202 are installed in accordance with this, and the outer shell body 22 reaching the reaching shaft 14 from the starting shaft 12 is formed, The underpass structure 10 is constructed by excavating the inside of the shell body 22. At this time, inside each box 20 constituting the outer shell 22 may be filled with solid mortar or the like as necessary.

  Now, according to the construction method of the underpass structure configured as described above, when the outer shell 22 is formed, a plurality of propulsion units 16 are connected to form unit propulsion units 160 to 162, and unit propulsion units Since each propulsion unit 16 of 160 to 162 is simultaneously propelled and the box 20 is installed as a unit box 200 to 202 that is connected in plural according to the connection state of the unit propulsion units 160 to 162, the box 20 is 1 Construction efficiency is improved compared to the case of installing books one by one.

  According to the construction method of the underpass structure according to the present invention, the construction efficiency can be improved and this kind of structure can be constructed, so that it can be effectively utilized when providing a three-dimensional intersection such as a road or a railway. .

It is explanatory drawing in the middle of construction of the underpass structure concerning the present invention. It is sectional drawing of the outer shell of the underpass structure constructed | assembled with the construction method concerning this invention. It is sectional drawing of the outer shell of the underpass structure constructed | assembled by the construction method concerning this invention, Comprising: It is a figure which shows the bending moment of each part at the time of changing design conditions, such as a covering. It is a front view of the 6 connection unit propulsion machine used with the construction method of the underpass structure concerning the present invention. It is a longitudinal cross-sectional view of FIG. FIG. 5 is a plan view of FIG. 4. It is a principal part external view of FIG. It is a principal part enlarged view of FIG. It is a front view of the reverse L-shaped connection unit propulsion machine used with the construction method of the underpass structure concerning the present invention. FIG. 10 is a longitudinal sectional view of FIG. 9. FIG. 10 is a plan view of FIG. 9. It is a principal part external view of FIG. It is explanatory drawing of the connection structure between the connection unit boxes in the construction method of the underpass structure concerning the present invention. It is explanatory drawing of the connection completion state between the connection unit boxes in the construction method of the underpass structure concerning the present invention. It is sectional drawing which shows the other example of the outer shell of the underpass structure constructed | assembled with the construction method concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Underpass structure 12 Starting shaft 14 Reaching shaft 16 Propulsion machine 160 6 connection unit propulsion machine 161 reverse L connection unit propulsion machine 18 start stand 20 box 200 6 connection unit box 201 reverse L connection unit box 202 3 Connecting unit box

Claims (8)

When constructing an underpass structure that bypasses the lower ground of ground facilities such as roads and railways and both ends reach the ground,
A starting shaft is provided on one end side of the planned construction site of the underpass structure, and a reaching shaft is provided on the other end side,
From the starting shaft to the reaching shaft, propelling the propulsion device and sequentially setting the box behind it, forming the outer shell of the underpass structure having a closed cross-sectional shape;
After forming the outer shell, excavating the interior surrounded by the box, the construction method comprising the step of making the underpass structure,
When forming the outer shell, a plurality of the propulsion units are connected to form a connection unit propulsion unit, and the propulsion units of the connection unit propulsion unit are driven almost simultaneously. A construction method of an underpass structure, characterized in that a box block whose outer shape is substantially the same as that of the connection unit propulsion unit according to the connection state of the propulsion unit.   2. The underpass structure according to claim 1, wherein the outer shell body is formed in a rectangular cross-sectional shape by installing a plurality of the box blocks adjacent to each other in the vertical and horizontal directions and connecting the ends. How to build. The propulsion device has an outer shape with a substantially square cross section,
3. The box body according to claim 2, wherein unit boxes having substantially the same shape as a cross-sectional shape of the propulsion unit are connected to each other so that the outer shape is substantially the same as the connection unit propulsion unit. How to build an underpass structure.   The connecting unit propulsion unit includes an L-shaped or inverted L-shaped connecting unit propulsion unit disposed at a corner of the rectangular outer shell body, and a straight line disposed at a horizontal or vertical portion of the rectangular outer shell body. The underpass structure constructing method according to claim 2, wherein the underpass structure is constructed of a connecting unit propulsion unit.   The underpass structure according to any one of claims 1 to 4, wherein a connecting portion between the box blocks is set at a position where an absolute value of a bending moment of the outer shell body is substantially minimized. How to build things.   6. The method for constructing an underpass structure according to claim 1, wherein the connecting unit propulsion device is provided with a folding mechanism capable of direction control.   The construction method of the underpass structure according to any one of claims 1 to 6, wherein the connecting unit propulsion unit is provided with an intermediate push jack for individually controlling the propulsion of each propulsion unit.   5. The underpass structure according to claim 4, wherein the connecting unit propulsion unit has a connecting unit propulsion unit having a convex or reverse convex cross section disposed in a partition wall provided in the middle of the rectangular outer shell. How to build.

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