JP5500483B2 - Construction method of underground structure - Google Patents

Description

  The present invention relates to a method for constructing an underground structure such as a pipe roof.

  Conventionally, a pipe roof or a tunnel-like structure is constructed by pressing pipes made of steel pipes or the like in the ground in the horizontal direction, press-fitting them into adjacent positions, and joining the pipes together Is known (for example, Patent Document 1).

  In order to join adjacent pipes in this construction method, a joint member is installed in advance on the outer peripheral surface of the pipe, and the method of propelling while fitting the positions of adjacent joints during press fitting and fitting them together as a guide is a method. Are known.

  However, in the above joining method, pipes must be press-fitted while performing precise alignment so that adjacent joint members are fitted together at the time of pipe press-fitting, and work efficiency is poor.

  Therefore, excavating one of the grounds separated by a pipe roof or the like to form a work space, forming a mold by supporting a plate material for the mold through a separator to each pipe exposed in the work space, A construction method for joining pipes by filling a frame with a filler such as mortar has been developed.

  In order to fix the separator 100 to each pipe 101, as shown in FIG. 12, a hole 102 is formed in the pipe 101, and one end of the separator 100 is inserted into the pipe 101 through the hole 102, and a nut is formed on the inner peripheral surface of the pipe. A fixing method using a fixing tool 103 such as the like, or a support bar 105 such as a reinforcing bar is fixed to the outer peripheral surface of the pipe 101 via spacers 106 and 106 as shown in FIG. There are a method of fixing via the fixing member 107 and a method of welding the end of the separator directly to the outer peripheral surface of the pipe at the work site.

JP 2003-343190 A

  However, in the conventional technique as described above, there is a problem that when the hole shown in FIG. 12 is opened, water discharged from the ground may leak into the working space through the hole.

  Further, in the method shown in FIG. 13, the fixing member cannot be attached unless the support bar is lifted from the surface of the steel pipe via the spacer, which requires a large number of parts and increases the cost. was there. In addition, there is a problem that the cost increases because welding must be performed twice between the steel pipe and the spacer and between the spacer and the reinforcing bar.

  Furthermore, performing the welding work at the work site has a problem that the working environment is poor and that once it is fixed, it is difficult to align the position.

  In view of such a conventional problem, the present invention has been made for the purpose of providing a construction method of an underground structure that is excellent in workability and can be constructed at low cost.

The feature of the invention according to claim 1 for solving the conventional problems as described above and achieving the intended purpose is that a plurality of pile-like members are oriented in the horizontal direction in the ground, and After forming a pile-like member group by burying in an arrangement adjacent to each other, excavating one ground separated by the pile-like member group to form a work space, each pile shape exposed in the work space A method for constructing an underground structure, in which a member is supported by a member through a separator to form a mold, and the piles are filled with a filler such as mortar in the mold. In this case, the support bar is fixed to the outer peripheral surface of the pile-shaped member in advance so that the surface thereof is in contact with the outer peripheral surface of the pile-shaped member, and the joint fitting having a notch portion into which the support bar is fitted, and A separator holding portion pivotally supported by the joint fitting, The notch portion includes a semicircular semicircular recess and a receiving portion that communicates with the semicircular recess and guides the support bar to the semicircular recess from the opening of the notch. And, on the inner edge of the receiving portion, a separator fixing member is used that protrudes so that a fixing tool that presses the support bar toward the semicircular concave portion can be taken in and out,

After excavating one ground separated by the pile-shaped member group to form a work space, the support rod is supported by the support bar through the separator fixing member so as to be rotatable. A formwork is constructed by supporting a formwork plate at the other end, and the filling material is filled in the formwork.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, the receiving portion is formed in a fan shape that requires one opening edge of the semicircular recess.

According to a third aspect of the present invention, in addition to the structure of the first or second aspect, the joint fitting includes a pivot hole in which the separator holding portion is pivotally supported from an axis of the support bar. The opening edge of the notch is formed so as to contact the pile-shaped member that supports the support bar.

  According to a fourth aspect of the present invention, in addition to the configuration of the first, second, or third aspect, the joint fitting has an inclined portion that is inclined outward from the opening edge at the opening edge of the notch. That is.

  According to a fifth aspect of the present invention, in addition to the configuration of the first to third or fourth aspects, the joint fitting is shaped to protrude in the circumferential direction of the semicircle from one edge of the semicircular recess. Is provided with an engaging portion.

As described above, the method for constructing an underground structure according to the present invention embeds a plurality of pile-shaped members in the ground by placing the pile-shaped members in an arrangement adjacent to each other with the length direction set in the horizontal direction. After forming, excavate one ground separated by the pile-shaped member group to form a work space, and support the plate material for formwork through the separator to each pile-shaped member exposed in the work space. In the method for constructing an underground structure in which a mold is formed and the piles are filled with a filler such as concrete in the mold, a support bar is provided on the outer peripheral surface of the piles. A joint fitting having a notch portion into which the support bar is fitted, and a separator holding portion pivotally supported by the joint fitting, so that the surface thereof is in contact with the outer peripheral surface of the pile-shaped member. The notch is a semicircular recess having a semicircular shape A receiving portion that communicates with the semicircular recess and guides the support bar to the semicircular recess from the opening of the notch, and the inner edge of the receiving portion has the support A working space is formed by excavating one of the grounds separated by the pile-shaped member group, using a separator fixing member that protrudes so that a fixing tool that presses the bar toward the semicircular concave portion can be put in and out. After that, one end of the separator is rotatably supported by the support bar through the separator fixing member, and a mold is constructed by supporting the plate member for the mold at the other end of the separator. By filling the filler in the frame, the support bar is directly fixed to the pile-shaped member made of steel pipe or the like, so there is no need to use parts such as spacers, and the number of parts can be reduced and the cost can be reduced. Can also be installed It is possible to readily through the separator stake-like member made of steel or the like to install the formwork in, cost reduction can be achieved by it improves workability.

  Further, in the present invention, the receiving portion is formed in a fan shape that requires one opening edge of the semicircular recess, so that the separator fixing member can be easily fixed to the support bar. Can do.

Further, in the present invention, the joint fitting is formed with a pivot hole in which the separator holding portion is pivotally spaced from the axis of the support bar in a direction perpendicular to the axis of the separator. The opening edge of the notch is formed so as to abut on the pile-shaped member that supports the support bar, so that the movement of the joint bracket in the direction away from the support bar can be restricted and stable. The fixed state can be maintained.

  Furthermore, in the present invention, the joint fitting is preferably provided with a separator fixing member for a cylindrical pile-shaped member by forming an inclined portion inclined outward from the opening edge at the opening edge of the notch. It can be made to correspond.

  Further, in the present invention, the joint fitting includes an engaging portion having a shape projecting in the circumferential direction of the semicircle from one edge of the semicircular recess, so that the separator is separated from the support bar. The fixing member can be engaged in a stable state.

It is a front view which shows the member for separator fixation used for this invention method. It is a left view same as the above. FIG. 2 is a partially cutaway front view showing the joint fitting in FIG. It is a perspective view which shows an example of the steel pipe used for this invention method. It is sectional drawing which shows the outline of the pile-shaped member embedding process of this invention method. It is a side view which shows the outline of a steel pipe press-fitting device same as the above. It is sectional drawing which shows the outline of a work space construction process same as the above. It is a partial expanded sectional view which shows the outline of a mold installation process same as the above. It is a partial expanded sectional view which shows the installation state of the separator fixing member in FIG. It is a partial expanded sectional view which shows the outline of the filler filling process of this invention method. It is sectional drawing which shows an example of the structure constructed | assembled by the method of this invention. It is a partial expanded sectional view which shows an example of the conventional formwork installation state. It is a partial expanded sectional view which shows another example of a mold installation state same as the above.

  Next, the aspect of the separator fixing member used in the method of the present invention will be described based on the embodiments shown in the drawings. In the figure, reference numeral 1 denotes a separator fixing member, and 2 denotes a separator.

The separator fixing member 1 includes a joint fitting 3 that engages with the support bar A and a separator holding portion 4 pivotally supported by the joint fitting 3, and fixes one end of the separator 2 to the separator holding portion 4. Thus, the separator 2 is rotatably supported by the support bar A.

  The joint fitting 3 has a cutout portion 5 opened on one side edge side, and the outer peripheral portion of the support bar A is fitted into the cutout portion 5.

  The notch 5 includes a semicircular recess 6 and a receiving portion 7 that communicates with the semicircular recess 6, and has a half-heart shape that opens to one side edge of the joint fitting 3 as a whole. Yes.

  The semicircular concave portion 6 is formed in a semicircular shape, and a half body of the outer peripheral portion of the support bar A is inserted into the concave portion 6.

  The semicircular recess 6 is formed with the semicircular diametrical direction obliquely downward from the opening side of the notch 5, and at least a part of the semicircular recess 6 on the upper side of the support bar A Is supposed to be covered.

  At one edge of the semicircular recess 6 of the semicircular recess 6, an engaging portion 8 is formed projecting in the semicircular circumferential direction, and this engaging portion 8 is the outer periphery of the support bar A. It engages with the part.

  The receiving portion 7 is formed so as to communicate with the semicircular recess 6 and is configured to guide the support bar A inserted from the opening of the notch 5 toward the semicircular recess 6.

  The receiving portion 7 is formed in a fan shape that requires one edge of the semicircular recess 6, that is, the edge on the engaging portion 8 side, and the inner surface of the receiving portion 7 from the tip of the engaging portion 8. Is formed larger than the diameter of the support bar A.

Further, the fixing tool 9 protrudes from the inner surface of the receiving portion 7 toward the semicircular recess 6 side so as to be able to be taken in and out, and the support bar A inserted into the notch 5 is directed toward the semicircular recess 6 side. To press.

For the fixing tool 9 , for example, a fixing bolt screwed into a screw hole 10 formed so as to penetrate the joint metal fitting 3 is used, and the fixing bolt 9 is fixed by advancing and retracting in the screw hole 10. The front end portion of the bolt 9 is protruded from the inner surface of the receiving portion or pulled into the screw hole 10.

In addition, the surface of the joint fitting 3 on the side where the notch portion 5 is opened is formed with inclined portions 11a and 11b that are inclined obliquely outward from the opening edge, depending on the surface shape of the pile- shaped member B. It can come into contact with the surface of the pile-shaped member B.

  The separator holding part 4 has a pivoting rising part 13 having a shape raised from the upper surface part of the main body part 12, and a pivoting bolt passed through a through hole 14 formed in the pivoting rising part 13. 15 is screwed into a pivot hole 16 formed in the joint fitting 3.

  The separator holding portion 4 is fixed to the joint fitting 3 by tightening the pivot support bolt 15, and can be rotated by loosening the pivot support bolt 15.

  The pivot hole 16 is formed at a distance from the axis of the support bar A in the direction perpendicular to the axis of the separator 2, that is, the direction in which the tensile force acts.

The upper surface of the main body 12 is formed in an arc shape so that the separator holding portion 4 can rotate with respect to the joint fitting 3 .

  The main body 12 is formed with a fixing screw hole 17 as a fixing means for fixing the end of the separator 2, and the bolt 2 a formed at the end of the separator 2 is screwed into the fixing screw hole 17. By combining, the separator 2 is fixed to the separator holding part 4.

  The fixing screw hole 17 is formed so that the pivotal support hole 16 of the joint fitting 3 is positioned on the extension line of the central axis.

  Next, the method of the present invention using this separator fixing member 1 will be described with reference to FIGS.

First, as shown in FIG. 4 in the manufacturing factory of a steel pipe B1 constituting the Kuijo member B, the support rod A consisting of a round bar-shaped reinforcing bar on the outer peripheral surface of the steel pipe B1, A ... a is the surface of the steel pipe B1 It fixes beforehand by welding so that it may touch an outer peripheral surface.

Next, the steel pipes B1, B1... Are carried into the pit 20 constructed at the construction site, and as shown in FIG. The pile-shaped member group 22 is formed by being embedded in

As shown in FIG. 6, each pile-shaped member B is embedded by placing a steel pipe B1 in the pit hole 20 with its length direction oriented in the horizontal direction, and an excavating device 23 such as an earth auger inside the steel pipe B1. Insert and excavate the front ground 21, and press the steel pipe B1 forward using the propulsion device 24. This process reaches a predetermined length while adding a new steel pipe B1 to the rear end side of each steel pipe B1. Do until you do. In addition, each steel pipe B1 is embed | buried so that the support bar A may be arrange | positioned at the working space 25 side mentioned later.

After the pile-shaped member group 22 is formed, one ground separated by the pile-shaped member group 22 is excavated to form a work space 25 as shown in FIG. By this excavation, the quarter parts of the pile-shaped members B adjacent to each other are exposed in the work space 25. And after cleaning the exposed part, as shown in FIG. 8, FIG. 9, the member 1 for fixing a separator is attached to the support bar A fixed to the outer peripheral surface of the pile-shaped member B previously.

  In order to attach the separator fixing member 1 to the support bar A, the tip of the fixing bolt 9 is accommodated in the screw hole 10, and the joint fitting 3 is engaged with the support bar A in this state.

At this time, the inclined portions 11a and 11b of the joint fitting 3 come into contact with the surface of the pile-shaped member B , and positioning is automatically performed.

  Then, the fixing bolt 9 is screwed and protruded from the inner surface of the receiving portion 7 to the semicircular recess side 6 so that the tip of the fixing bolt 9 presses the surface of the support bar A toward the semicircular recess side. Thus, the joint fitting 3 is fixed to the support bar A.

Next, one end 2a of the separator bolt 2 is screwed and fixed to the separator holding portion 4, and the mold plate member C1 is fixed to the other end.

At this time, the angle of the separator holding part 4 with respect to the joint fitting 3 is adjusted, and the fastening position of the plate material fixing nut 26 is adjusted so that the formwork plate material C1 is disposed at a desired position, and the pivot bolt 15 is attached. The fastening separator holding part 4 is fixed to the joint metal fitting 3.

  Then, after the installation of the mold C is completed, the mold C is filled with a filler 27 such as mortar as shown in FIG. At this time, the mold C receives an outward pressure from the inside by the filler 27, and a tensile force acts on the separator 2 in the axial direction.

Due to this tensile force, a rotational moment is generated in the joint fitting 3 in the direction of pushing the opening lower edge portion 11b toward the pile-shaped member B, whereby the opening lower edge portion is pressed against the outer peripheral surface of the pile-shaped member B. The joint fitting 3 receives a reaction force from the pile-shaped member B. As a result, the joint metal fitting 3 is prevented from rotating in the direction away from the support bar A, and the joint metal 3 is fixed to the support bar A in a stable state. Thereby, deformation of the mold C due to the pressure of the filler 27 can be suppressed.

Then, the filler 27 such as mortar is sufficiently cured and cured, and the pile-shaped members B and B are joined. Finally, the plate material C1 for formwork is removed from the separator 2, and the portion protruding from the cured filler surface of the separator 2 is cut to complete the operation.

  In the above-described embodiment, the example in which the separator is fixed by being screwed to the separator holding portion has been described. However, the separator and the separator holding portion may be fixed by other fixing means such as pinning. May be formed integrally.

A Support bar
B Pile-shaped member
B1 Steel pipe C Formwork
C1 Formwork plate 1 Separator fixing member 2 Separator 3 Joint metal fitting 4 Separator holding part 5 Notch part 6 Semicircular recess 7 Receiving part 8 Engaging part 9 Fixing tool (fixing bolt)
DESCRIPTION OF SYMBOLS 10 Screw hole 11 Inclined part 12 Main-body part 13 Pivoting support part 14 Through-hole 15 Pivoting bolt 16 Pivoting hole 17 Fixing screw hole 20 Bore hole 21 Ground 22 Pile-shaped member group 23 Excavator 24 Propulsion machine 25 Work Space 26 Plate material fixing nut 27 Filler

Claims (5)

A plurality of pile-shaped members in the ground are oriented in the horizontal direction in the horizontal direction and embedded in an arrangement adjacent to each other to form a pile-shaped member group, and then one ground separated by the pile-shaped member group is A work space is excavated to form a mold frame by supporting a plate material for the mold frame through each separator on each pile-shaped member exposed in the work space, and a filler such as concrete is formed in the mold frame In the construction method of the underground structure that joins between the pile-shaped members by filling
The support bar is fixed beforehand to the outer peripheral surface of the pile-shaped member so that the surface thereof is in contact with the outer peripheral surface of the pile-shaped member,
A joint fitting having a notch portion into which the support bar is fitted, and a separator holding portion pivotally supported by the joint fitting, the notch portion being a semicircular semicircular recess and the semicircle Jo recess and communicating is configured with a receiving portion for guiding the supporting bar from the opening of the notch in the semicircular concave side, the inner edge of the receiving portion, the said support rod Using a separator fixing member that protrudes so that a fixing tool that presses into the semicircular concave portion can be taken in and out,
After forming the work space by drilling one of the ground which is separated by the stake member group, the one end of the separator causes rotatably supported by the support bar through the separator fixing member, the separator A method for constructing an underground structure is characterized in that a formwork is constructed by supporting a formwork plate at the other end of the mold, and the filler is filled in the formwork.   The construction method for an underground structure according to claim 1, wherein the receiving portion is formed in a fan shape that requires one opening edge of the semicircular recess. In the joint fitting, a pivot hole in which the separator holding portion is pivotally formed is formed at a distance from the axis of the support bar in a direction perpendicular to the axis of the separator, and the notch The construction method of the underground structure of Claim 1 or 2 formed so that the opening edge part of this might contact | abut to the said pile-shaped member which supported the support bar.   The construction method for an underground structure according to claim 1, wherein the joint fitting is formed with an inclined portion inclined outward from the opening edge at the opening edge of the notch.   The method for constructing an underground structure according to claim 1, wherein the joint fitting includes an engaging portion having a shape projecting in a circumferential direction of the semicircle from one edge of the semicircular recess. .

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