JP4077455B2 - Embedding method of tubular member - Google Patents

Description

  The present invention relates to a method for embedding a tubular member such as an element used for construction of an underground structure constructed so as to cross a railroad track or a road.

  Conventionally, as a method of constructing an underground structure by a non-open-cut method so as to cross below railway tracks or roads, it is inserted by pushing a tubular member such as an element or pushing it into the ground while excavating and removing earth and sand by towing In addition, a method of burying them in combination and using them as protection for the underground structures to be constructed, or as an underground structure main body is used.

However, in the conventional element embedding method described above, at the stage of inserting the element, ground excavation is performed from the opening at the tip of the element, the excavated earth and sand is taken into the element, conveyed backward, and discharged to the outside. Therefore, when an obstacle is encountered when the element is inserted, the obstacle can be taken in and removed only from the opening at the tip of the element.
In this case, face the face inside the element, and then remove the obstacles on the face, remove the earth around the obstacle, support walls such as retaining walls, pillars, and upsets, etc. It was necessary to install and perform earth retaining work, which was troublesome. In the case where the excavator is used for excavation at the tip of the element, the earth retaining work is performed after the work of removing the internal excavation part while leaving the outer shell of the excavator.

  An object of the present invention is to easily remove a ground part in front of an obstacle when an obstacle is encountered when the element is inserted into the ground while excavating the ground at the tip. The object is to provide a method for embedding a tubular member.

In order to solve the above problems, the invention described in claim 1 is, for example, as shown in FIG. 4, a plurality of tubular members (for example, the leading element 11 and the trailing element 1 </ b> A) used in the underground structure are tubular. In the method of embedding a tubular member in which the axial direction of the member is set as the insertion direction, a blade is provided at the tip, and the excavation of the ground is performed at the tip opening, and the tube is sequentially inserted and buried adjacent to the ground. A tubular member (for example, the preceding element 11) provided with a earth retaining plate 5A that has at least one opening 111 formed in the side wall 11a extending in the direction and that can protrude and retract outward from the opening. A first step of inserting and embedding, and mounting the other tubular member (for example, the trailing element 1A) adjacent to the side wall portion of the embedded tubular member 11 and a cutting edge at the tip thereof, Tip open While performing excavation of the ground at a portion and a second step of embedding is inserted into the ground,
When embedding the other tubular member in the ground in the second step, the earth retaining plate is projected from the opening of the adjacent existing tubular member so that the ground in front of the distal end of the other tubular member. A soil retaining step for retaining a mountain portion is performed.

  According to the first aspect of the present invention, in the first step, at least one opening is formed in the side wall extending in the insertion direction, and an earth retaining plate that can be protruded and retracted outward from the opening is provided. The tubular member thus inserted is embedded in the ground and embedded, and then the other tubular member is provided adjacent to the side wall portion of the embedded tubular member, and a tip is provided at the distal end, and the distal end thereof In the second step of inserting and burying in the ground while excavating the ground at the opening portion, the earth retaining plate protrudes from the opening of the existing tubular member adjacent in the earth retaining step, and the other Since the earth retaining portion in front of the distal end portion of the tubular member is earthed, there is an obstacle in front of the distal end portion of the other tubular member inserted and embedded in the second step by the earth retaining plate. Excavate the natural ground part ahead of the tip of the other tubular member When it is necessary to excavate the natural ground portion, the front natural ground portion can be easily removed without excavating the retaining wall such as a retaining wall or raising upright. When there is an obstacle, excavation can be easily performed. Therefore, after removing the natural ground part, particularly when the natural ground part includes an obstacle, the obstacle is quickly removed together with the natural ground part, and then the other tubular member is inserted into the ground. Can be buried in the ground.

Moreover, excavation work of the natural ground part ahead of the other tubular member can be performed from the existing tubular member through the opening. In particular, in the case where there are obstacles in the front ground part that cannot be crushed by excavation at the opening of the tip of the other tubular member, which obstructs the insertion of the other tubular member, the obstacle together with earth and sand It is not necessary to perform the operation of removing the inside of the tubular member that is actually inserted, so that the operation of embedding the other tubular member can be speeded up, and the construction period can be shortened.
Also, the state of insertion of the other tubular member embedded in the second step into the ground and the state of the joint portion when a joint portion for connecting to the existing tubular member is provided on the other tubular member Even if it is necessary to check the front of the existing tubular member, etc., the earth retaining plate is projected from the tubular member embedded in the first step so that the earth retaining plate is in front of the tip of the other tubular member. The earth retaining part of the earth retaining part is excavated, and the state of the insertion of the other tubular member from the excavated part into the ground and the joint state of the joint part of the other tubular member are confirmed. can do.

  Here, as said tubular member, the long thing used as an underground structure by being inserted in the ground is mention | raise | lifted, for example, steel elements, a pipe roof, etc. are mentioned. Further, the tubular member may have any cross-sectional shape as long as it has a tubular shape, and may have a cross-sectional shape such as a rectangular shape, a square shape, a circular shape, an elliptical shape, or the like.

  According to a second aspect of the present invention, in the method for embedding a tubular member according to the first aspect, in the third step, the earth retaining portion in front of the other tubular member is earthed by the earth retaining plate, and then soil is removed. The dug and excavated earth and sand, and the earth and sand that has been excavated or if there is an obstacle in the earth and mountain part, the earth and sand and the tubular member in which the obstacle is formed or the other A discharge step of discharging through the tubular member to the outside of the tubular member or the other tubular member is performed.

According to the second aspect of the present invention, when the front natural ground portion is dug and excavated, for example, an obstacle exists in the natural ground portion in front of another tubular member inserted into the ground, the earth retaining After clogging the ground part in front of the other tubular member in the process, the earth part or the ground part that has been excavated by hand digging the ground part that has been earthed by the discharging process, or the ground part If there is an obstacle, the earth and sand and the obstacle are discharged to the outside of the tubular member or the other tubular member through the opening or the inside of the tubular member or the other tubular member. The natural mountain part ahead of the tubular member can be easily removed. In other words, earth retaining work such as assembling a supporting wall such as a retaining wall or an erection in order to remove the earth and sand and the obstacle if there is an obstacle in the ground part or the earth part of the front ground part. It is possible to easily perform excavation work of the natural ground without performing at least one of earth and sand and obstacles.
Therefore, even when the obstacle exists, it can be easily removed and the insertion operation of the other tubular member into the ground can be resumed, the burial operation can be speeded up, and the construction period can be shortened. Can be planned.

  Also, the state of insertion of the other tubular member embedded in the second step into the ground and the state of the joint portion when a joint portion for connecting to the existing tubular member is provided on the other tubular member Even if it is necessary to confirm the front of the existing tubular member, the front of the tip of the other tubular member can be easily obtained by simply protruding the retaining plate from the tubular member embedded in the first step. Since the earth retaining portion can be removed and the earth retaining portion can be removed, the other tubular member from which the earth has been removed is inserted into the ground from the front of the other tubular member. It is possible to easily confirm the situation, the joint state of the joint portion of the other tubular member, and the like.

  Here, the obstacle is a thing that exists in the front natural ground portion and prevents the insertion of the tubular member, for example, a thing that cannot be crushed by the excavator.

  According to the first aspect of the present invention, it is necessary to excavate a natural ground portion in front of the tip, such as an obstacle existing in front of the tip of the other tubular member inserted and embedded in the second step. When there is an obstacle, it is possible to easily excavate the natural ground part in front of it without performing a retaining work such as assembling a supporting wall such as a retaining wall or an upset. The removal operation can be easily performed, and after the ground part and the obstacle are quickly removed, the other tubular member can be inserted into the ground to be buried in the ground. Moreover, excavation work of the natural ground part ahead of the other tubular member can be performed from the existing tubular member through the opening. In particular, an obstacle that prevents the insertion of the other tubular member, which is equipped with a blade at the tip of the other tubular member at the front ground portion and cannot be crushed by excavation at the tip opening portion. In the case where it exists, it is not necessary to remove the obstacle together with the earth and sand within the tubular member that is actually inserted, and the work of burying the other tubular member can be speeded up, and the construction period can be shortened. Can be achieved.

  According to invention of Claim 2, even when an obstacle exists in the front natural ground part, the front natural ground is not carried out without performing earth retaining work such as assembling a supporting work such as a retaining wall or an upset. The removal operation of the part can be easily performed, the operation of burying the other tubular member can be speeded up, and the construction period can be shortened.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
First, the configuration will be described.
The element 1 of the element 10 with the earth retaining plate shown in FIG. 1 is used when constructing an underground structure that crosses the railroad track 2 under the railroad track or the road (here, under the railroad track 2). By being inserted and arranged side by side, it is used as a protective part in the construction of the underground structure 3 and becomes the underground structure main body.
The element 1 shown in FIG. 1 shows one of a plurality of elements that are inserted and combined in the ground so that an underground structure that crosses under the railroad track 2 has a long cross-sectional shape. Then, after these elements are assembled in a square shape, the inside is excavated, and the plurality of elements themselves form a square-shaped tubular underground structure. In addition, the inside of the element buried by being inserted into the ground is filled with a hardener such as concrete.

The element 1 is made of a long tubular member made of, for example, concrete or steel, and here has a box shape with a rectangular cross section. The element 1 will be described as a general element that is buried after a reference element that is inserted into the ground while excavating as a first element when constructing an underground structure. In addition, in FIG. 1, the element embed | buried previously is shown with the code | symbol 1E.
Element 1 is embedded in the ground by the propulsion method. As described above, the axial direction is the insertion direction, the tip (one end) is equipped with a blade, and the ground is excavated at the tip opening. While being propelled, it is inserted into the ground and buried.

  The element 1 shown in FIG. 1 has an excavation that has a cutting edge having a diameter substantially the same as the outer diameter of the element 1 at the distal end portion 12 in the axial direction, that is, the distal end portion 12 that becomes the distal end side when inserted into the ground. When the device 6 is attached and an obstacle (indicated by reference numeral 8 in FIG. 3) is present on the outer peripheral portion of the distal end portion 12 in the front ground where the element 1 itself is excavated and inserted. The earth retaining plate 5 for earth retaining is secured to secure a removal work space around the obstacle for removing the obstacle.

The earth retaining plate 5 is plate-shaped, and is perpendicular to the top surface plate portion 51 and a top surface plate portion 51 that is slidable along the top surface (the upper surface of the outer surface) 1 a of the element 1. And a side plate portion 52 slidably provided along the side surface 1b. These plate portions 51 and 52 are formed in an L-shaped cross section, and are provided on guide members 55 and 56 attached along the corners of the element 1 at side portions 51a and 52a that are separated from each other along the respective longitudinal directions. It is supported so that it can slide along, that is, can move forward and backward from the front end portion 12 of the element 1. The guide members 55 and 56 are each formed of a U-shaped long member, and the side portions 51 a and 52 a are internally fitted by fixing the opposing side wall portions to the element 1.
The length of the earth retaining plate 5 in the axial direction protrudes forward from the front surface of the excavator 6 attached to the distal end portion 12 when sliding, and has a length capable of forming a work space. In addition, the earth retaining plate 5 may be made of any material as long as the earth retaining plate 5 has a durability capable of retaining the earth by projecting and forming a natural ground in front of the excavator 6 as a work space. For example, the thing made from wood, resin, steel is mentioned.

  In addition, although the shape of the earth retaining plate 5 attached to the element 1 is a long one having an L-shaped cross section, the top surface 1a is not limited to this, for example, as shown in FIG. And it is good also as a structure which provided the two plates 51A and 52A so that sliding was possible on the one side 1b slidably forward. In this case, the guide members 57 and 58 for slidably fitting the side edges 51b and 52b of the respective plates 51A and 52A parallel to the axial direction of the elements are provided on the outer surfaces 1a and 1b of the elements, respectively. Etc. The guide members 57 and 58 are attached to the outer surfaces 1a and 1b of the element 1, respectively, so that concave portions facing each other are formed. Both side edges 51b and 52b are slidably fitted in these recesses.

  In addition, the earth retaining plate 5 is configured to slide on the element 1 along the top surface 1a and the one side surface 1b. Any method may be used. For example, the outer peripheral surface may be provided along four surfaces, or may be provided along three surfaces. The earth retaining plate 5 is not moved backward from a predetermined position by a stopper (not shown) provided in the element 1. Here, the predetermined position is preferably a position where the front end of the retaining plate 5 is rearward of the front surface of the excavator 6 and can be easily protruded, that is, a position in the vicinity of the rear end edge of the excavator 6.

The excavator 6 has four outer surfaces that are substantially flush with the four outer surfaces of the tubular element 1, and an outer shell portion 61 in which a communication portion that communicates in the axial direction is formed. It has a digging part 62 that is detachably provided in the communication part and that is exposed to the front surface of the outer shell part 61 and excavates a natural ground in front of the outer shell part 61, that is, in front of the excavator 6.
The excavation unit 62 includes a cutter unit 63 that faces the front side of the excavation device 6 from the opening on the front side of the communication unit and rotates about the axis, and a drive unit that includes a motor (not shown) that rotates the cutter unit 63. With. In addition, since the structure of these cutter parts 63, a drive part, etc. is the structure similar to the conventional excavation apparatus, description is abbreviate | omitted. That is, in the excavator 6, the excavation part 62 attached to the outer shell part 61 can excavate the natural ground in front of the excavator 6, and the excavation part 62 is removed from the outer shell part 61 and extracted backward. Thus, the face can be opened with the outer shell 61 left.

The earth and sand excavated by the excavating device 6 is sucked through the inside of the element 1 and discharged by the suction and soil discharging device 16 installed outside.
A PC steel strand 18 connected to the arrival side shaft 7 of the element 1 inserted into the ground is connected to the front surface portion of the excavation device 6, and the PC steel strand 18 is connected from the arrival side shaft 7 by the traction device 19. The excavator 6 is pulled to the arrival side shaft 7 side.

Next, a method for embedding the element 1 described above will be described.
First, in order to construct the underground structure 3 by inserting a plurality of elements including the element 1 into the ground 4 below the railway track 2 and burying and connecting them, the both sides of the railway track 2 are formed on the ground 4. A start side shaft (not shown) for starting the embedded element, and a reaching side shaft 7 that reaches the excavator 6 facing the start side shaft and attached to the tip of the embedded element (see FIG. Build 1). In addition, in embedding each element, it is carried out by attaching the excavation apparatus 6 to the tip part.

Then, in order to insert the first reference element 1E into the ground, a hole drilled by horizontal boring in the horizontal direction to extend in the horizontal direction and cross in the ground 4 under the railroad track 2 is formed. A PC steel wire 18 is inserted into the hole, and the element 1E inserted into the PC steel wire 18 and the excavator 6 provided at the tip of the element are connected. Then, a traction device 19 such as a hydraulic jack that pulls the wire 18 from the PC steel by taking a reaction force from the retaining wall 71 of the arrival side shaft 7 is installed on the arrival side shaft 7 side.
While pulling the element and the excavating device 6 by the towing device 19, the excavating device 6 excavates the tip portion of the element and inserts the element into the ground toward the reaching side vertical shaft 7 to embed it.

  In addition, although not shown in figure, the earth retaining plate which can be projected and retracted in front of the excavation apparatus 6 attached to the element front-end | tip part is attached to the outer peripheral surface of the front-end | tip part of this reference element 1E. Although this earth retaining plate may be attached to any of the four outer peripheral surfaces, it is desirable that the retaining plate be provided so as to protrude forward along at least the top surface and both side surfaces. If it is provided so as to be able to appear and disappear in the axial direction along the four surfaces, a space where work can be performed in front of the excavation device 6 even if the soil properties in the four directions of the ground part to be excavated and inserted are weak. Can be built.

Then, in the same manner as the preceding embedded element (reference element in this figure) 1E, the element 1 is inserted into the ground while excavating the ground with the excavator 6 at the tip adjacent to the preceding element 1E. Then, the excavator 6 reaches the arrival side shaft 7 and is buried in the ground.
At this time, when the element 1 is propelled and inserted into the ground, as shown in FIG. 3 (a), a hard rock that cannot be crushed by the excavator 6 in the natural ground portion G in the front direction of the insertion of the element 1 When there is an obstacle 8 such as an existing foundation, the excavation part 62 (see FIG. 1) of the excavator 6 does not interfere with the operation through the element 1 in order to remove the obstacle 8, for example, outside the element 1 The earth retaining plate 5 of the element 1 is protruded in front of the outer shell portion 61 and the ground portion G including the obstacle 8 is earthed (see FIG. 3B). . In addition, the earth-capped portion G that is earthed can be a work area when the obstacle 8 is removed.

  And the earth | ground part G including the obstacle 8 inside the earth retaining plate 5 which earthed is manually excavated and excavated, and the work which removes the obstacle 8 is performed. That is, the obstacle 8 is removed through the element 1 to the outside, for example, the start side shaft. Thereafter, the earth retaining plate 5 is pulled back so as to be positioned on the outer surface portion of the element 1 to cancel the state of retaining the soil in front of the excavator 6, and the excavation part 62 is installed in the outer shell part 61, and further excavation and insertion are performed. The element 1 is propelled by performing and the excavator 6 reaches the arrival side shaft 7 so that the element 1 is buried in a predetermined place in the ground. The earth retaining plate 5 to be pulled back may be pulled back to any position as long as the tip does not protrude forward from the front surface (face surface) of the excavator 6.

  Since the earth retaining plate 5 is provided in the element 1 that is inserted and buried in the ground in this way, when the element 1 is excavated and inserted at the tip, even if there is an obstacle ahead, It is not necessary to perform earth retaining work such as installing a retaining wall or a supporting work for supporting the retaining wall in order to remove the obstacle, and the obstacle removing work can be simplified accordingly. And after this obstruction removal operation | work, the insertion operation | work of the element 1 can be restarted immediately and, thereby, the embedding operation | work of an element can be simplified and shortening of a construction period can be aimed at.

  In addition, when the earth retaining plate 5 performs earth retaining, if a plurality of openings are formed in the side wall portion of the adjacent existing preceding element, a predetermined opening, that is, an obstacle in the opening is provided. The earth retaining plate 5 may protrude beyond the element 1 using an opening close to the object. Furthermore, if the opening is provided at a position close to the obstacle, the removal work of the obstacle such as excavating the earth retaining part and discharging the excavated earth and obstacles from the preceding element to the outside Can be performed from the preceding element, and it is not necessary to perform the work of removing the excavating portion 62 and the work of installing it again in the succeeding element 1, and the work of removing the obstacle can be easily performed correspondingly.

  In the above embodiment, the earth retaining plate 5 is provided on the element 1 itself to be inserted. However, the earth retaining plate 5 is not limited to this, and the earth retaining plate 5 can be earth retaining in front of the element being inserted. For example, as shown in FIG. 4A, the earth retaining plate may not be provided in the element 1A to be inserted, but may be provided in the front element 11 that has already been inserted and embedded. In this case, a plurality of openings 111 are formed in the side wall portion 11a adjacent to the trailing element 1A of the leading element 11 along the extending direction of the leading element 11, and the earth retaining plate 5A is removed from the opening 111. It is provided so as to be able to appear and retract on the side of the trailing element 1A. The earth retaining plate 5A is slidable on the inner surface of the top wall portion of the preceding element 11 by a guide member (not shown) along the inner surface toward the succeeding element 1A. The configuration of the guide member is substantially the same as that of each of the guide members 55 to 58 described above, and is arranged along the moving direction of the retaining plate 5A and is supported by internally fitting both sides of the retaining plate 5A. It has become. When the trailing element 1A is inserted into the ground while excavating a natural ground with the excavating device 6 serving as a cutting edge provided at the tip thereof, an obstacle is placed on the natural ground portion G in front of the excavating device 6. When 8 is present, in the preceding element 11, the earth retaining plate 5 </ b> A protrudes from the opening 111 </ b> A where the obstacle 8 is closest to the earth, so that the obstacle 8 can be removed by performing earth retaining above the obstacle 8. The work area S is constructed (see FIG. 4B), and the obstacle 8 is removed using the work area S.

  Note that the removal operation of the obstacle 8 may be performed from within the succeeding element 1 </ b> A after the excavation unit 62 of the excavating device 6 is removed as described above, or may be performed from the preceding element 11. When performing from the preceding element 11, it is not necessary to perform removal work and re-installation work of the excavating part 62 of the excavating device 6 at the tip of the succeeding element 1 </ b> A, as compared with the case of performing in the succeeding element 1 </ b> A. . That is, after the obstacle 8 is removed by the leading element 11, the insertion work of the trailing element 1A can be resumed immediately after the retaining plate 5A is drawn. Therefore, it is possible to simplify and speed up the burying work of the succeeding element 1A.

Even when it is necessary to confirm the state of the excavation part of the excavation device 6 attached to the distal end of the trailing element 1A, for example, the state of the bit, from the front of the excavation device 6, the earth retaining plate from the preceding element 11 It is visible by protruding 5A, earthing a natural ground portion G in front of the excavating device 6 attached to the preceding element 11, and manually excavating and removing the earthed portion from the preceding element 11. A region S is formed in front of the excavator 6 and can be easily confirmed from this region S.
Furthermore, when confirming the state of the joint part when the joint element connected to the preceding element 11 is provided on the succeeding element 1A, the ground in front of the excavating device 6 attached to the succeeding element 1A is similarly used. After earthing the mountain part, by removing the earthed part, a visible area S can be formed in front of the excavator 6 and the joint part can be confirmed from the area S. Furthermore, by removing the excavation part of the excavator 6 from the preceding element 11, the state of the element 1A being inserted can be confirmed. It should be noted that a retaining plate different from the preceding element 11 may be provided in the succeeding element 1A in the same manner as the element 1 described above, and the retaining plate may be used properly according to circumstances.

Further, the earth retaining plate 5 is attached to the element 1 to be embedded, but is not limited to this, and the outer peripheral surface of the excavator 6 attached to the tip of the element without being attached to the element to be embedded. You may attach to.
That is, it is good also as what was attached to the outer peripheral surface of the excavator comprised similarly to the excavator 6 mentioned above through the guide member along the said outer peripheral surface through the guide member. The configuration is shown in FIG.

  The excavator 6A shown in FIG. 5 is attached to the tip of an element inserted into the ground, and is provided in a cylindrical outer shell 61A communicating with the connected element, and detachably provided in the outer shell 61A. In addition, an excavation part 62A that is exposed on the front surface of the outer shell part 61A and excavates a natural ground in front of the outer shell part 61A, and forwards along the outer shell part 61A along at least a part of the outer peripheral surface of the outer shell part 61A. The earth retaining material 50 is provided so as to be able to move in and out and protrudes forward to be a earth retaining when excavating a natural ground portion in front of the outer shell portion 61A. The earth retaining material 50 is a portion where earth retaining is necessary in the front ground, when inserting the attached element, here, a succeeding element embedded in the horizontal direction adjacent to the previously embedded element The excavator 6A is attached to the top surface 61a and one side surface 61b of the outer shell portion 61A along the top surface of the succeeding element and the side surface on the side away from the existing element, respectively. An earth retaining material 50 having an L-shaped cross section having two earth retaining plates 5B and 5C provided so as to be able to move forward and backward along one side surface 61b is attached. The excavation part 62A is the same as the excavation part 62.

  The earth retaining material 50 is attached along the edge on the preceding element side of the top surface 61a of the outer shell portion 61A, and forms a recessed portion extending in the axial direction, and the leading member of both sides. Both side sides extending in the axial direction are slidably fitted in guide members 56A that are attached along the lower edge of the side surface 61b on the side away from the element and form a recess extending in the axial direction. It is attached in the state that was done. Note that the earth retaining plates 5B and 5C constituting the earth retaining material 50 are necessary around the obstacle when the obstacle exists in front of the element to be inserted when used for the embedding work of the element having a rectangular cross section. For example, it is provided so as to protrude along at least one of the four outer surfaces of the element, and the protruding retaining plate portion is used for removing the obstacle. What is necessary is just to be able to perform earth retaining of a required part.

Here, the earth retaining plate 5 described above is installed on the outer surface side of the element 1 or the excavator 6A attached to the tip of the element, but is not limited thereto, and can be slid to the inner surface side of the element. It may be provided.
For example, without using the excavator 6, the element pulling method (High Speed Element Pull Method: HEP method) is used together, and with a retaining plate that is buried in the ground by a method in which the face is open at the edge of the element tip An example of the configuration of the element is shown in FIG.

The element 1C shown in FIG. 6A has a tubular shape with a rectangular cross section like the element 1 described above, and extends in the axial direction along the upper surface 1f and one side surface 1g of the inner wall surface of the tip. An earth retaining material having an L-shaped cross section (earth retaining plate) provided so as to protrude and retract in the insertion direction via guide members 55B and 56B each forming a U-shaped groove with the upper surface 1f and one side surface 1g. 5D is provided.
The element 1D shown in FIG. 6 (b) has a rectangular cross section similar to the element 1 described above and has a tubular shape, and an earth retaining material 5E having a rectangular cross section is formed on the inner peripheral surface of the front end from the front end of the element. It is provided so as to be able to hold the ground part in front of the ground. Since the effects of the elements 1C and 1D configured as described above are substantially the same as those of the element 10 with the retaining plate described above, description thereof is omitted. For example, even if there are obstacles in the front ground when inserting while excavating in the ground, it is possible to easily remove the obstacles by removing the trouble of earth retaining work when removing the obstacles, Furthermore, it can be inserted and buried in the ground.

If the earth retaining plates 5D and 5E are provided on the inner peripheral surface like the elements 1C and 1D, other elements embedded adjacently in the corners on the outer surface side of the elements 1C and 1D A connectable joint portion can be easily provided.
Further, the earth retaining plate provided on the inner side like the elements 1C and 1D can be provided along any peripheral wall surface as long as it can be protruded forward and backward from the tip end portion of the element along at least a part of the peripheral wall portion. Of course, it may be provided to appear and disappear.

Further, the above-described movement of the earth retaining plates may be performed manually or may be performed freely using a driving device such as a hydraulic driving device.
At this time, it is desirable that the sliding movement of the retaining plate is performed irrespective of the excavation operation of the element itself. When a drive device such as a hydraulic motor or a hydraulic cylinder is used, the drive source of the drive device is preferably a drive source different from a drive source for propelling the element, such as a traction device.

In the above embodiment, the shape of the element is rectangular, but the present invention is not limited to this, and it is tubular and can be inserted into the ground in the axial direction. Any shape may be used as long as it is embedded. For example, it may be polygonal or cylindrical. Specifically, a pipe roof etc. are mentioned.
Furthermore, a joint portion connectable to an adjacent element may be provided on the element itself. In the above embodiment, when the elements 1 and 1A are buried in the ground, the elements 1 and 1A are inserted into the ground while being excavated using the excavators 6 and 6A. If the fastening plate 5 is provided in the element 1 into which the fastening plate 5 is inserted or the element 11 that has already been buried, it is inserted into the ground while excavating through the opening on the tip side without using the excavating devices 6 and 6A. It may be buried. Further, the previously embedded element 1E shown in FIG. 3 has the same configuration as the preceding element 11 shown in FIG. 4, or the configuration of the succeeding element 1A shown in FIG. 4 has the same configuration as the element 1 shown in FIG. May be.

It is a figure which shows schematic structure of the element of one Embodiment to which this invention is applied. It is a schematic front view which shows the modification of the attachment state of the earth retaining plate of FIG. It is a schematic diagram of the state which has inserted the element of FIG. 1 in the ground. It is a schematic diagram which shows the state which inserts a subsequent element adjacent to the preceding element in which the earth retaining plate was provided. It is a schematic front view which shows an example of the state which provided the earth retaining plate in the excavation apparatus. It is a schematic front view of the element which shows the modification of the element to which the earth retaining plate was attached.

Explanation of symbols

1,1A, 1C, 1D, 1E element (tubular member)
DESCRIPTION OF SYMBOLS 3 Underground structure 4 Ground 5,5A, 5B, 5C, 5D, 5E Earth retaining plate 6A Excavator 8 Obstacle 10 Element with earth retaining plate 11 Leading element (tubular member)
11a Side wall part 12 Tip part 50 Earth retaining material (earth retaining plate)
51 Top plate part (earth retaining plate)
52 Side plate part (earth retaining plate)
111, 111A opening

Claims (2)

A plurality of tubular members used in underground structures are equipped with a cutting edge at the tip, with the axial direction of the tubular member as the insertion direction, and sequentially adjacent to the ground while excavating the ground at the tip opening. In the embedding method of the tubular member to be inserted and embedded,
A tubular member having at least one opening formed in the side wall extending in the insertion direction and provided with a retaining plate that can be moved outward and outward from the opening is inserted into the ground and embedded. 1 process,
A second step of inserting another tubular member adjacent to the side wall portion of the embedded tubular member, and inserting and embedding it in the ground while excavating the ground at the distal end opening portion equipped with a cutting edge at the distal end portion. And
When embedding the other tubular member in the ground in the second step, the earth retaining plate is projected from the opening of the adjacent existing tubular member so that the ground in front of the distal end of the other tubular member. A method for embedding a tubular member, wherein a soil retaining step for retaining a mountain portion is performed. In the embedding method of the tubular member according to claim 1,
In the earth retaining step, after earth retaining of the ground part in front of the other tubular member by the earth retaining plate, the earth part that has been earth retaining is manually dug and excavated, If there is an obstacle in the natural ground portion, the earth and sand and the obstacle are discharged to the outside of the tubular member or the other tubular member through the tubular member or the other tubular member in which the opening is formed. A method for embedding a tubular member, wherein a discharging step is performed.

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