JP6387778B2 - Suspension jig used when building the core material of the underground continuous wall, the method of building the core material of the underground continuous wall, and the system for building the core material of the underground continuous wall - Google Patents

Description

The present invention Tutsi tool used in Tatekomu the core material該地during continuous wall at the construction of the underground continuous wall through the bottom of the underground object, Kenkomi method of the core material, and core material Relates to the built-in system .

  In the construction of continuous underground walls that pass under underground objects such as water, electricity and gas pipes and tunnels, excavation is performed in the vicinity of underground objects, and under the underground objects is excavated from the excavated holes. After so-called watermark moat, a core material such as a reinforcing bar is built in the hole (see, for example, Patent Document 1). In the method of building a reinforcing bar rod described in Patent Document 1, the building device includes a guide frame that guides the suspension of the reinforcing rod rod, and a rail that projects laterally from the guide frame and guides the lateral movement of the reinforcing rod rod. Is used to embed a reinforcing bar under the buried object.

Japanese Patent Laid-Open No. 11-140865

  In the method of building a reinforcing bar rod described in Patent Document 1, since the reinforcing rod is suspended through the guide frame and moved laterally between the left and right rails, the guide frame and the left and right rails have a width of the reinforcing bar rod. It will eat out outside. Thereby, it is necessary to excavate with a width wider than the wall thickness of the underground continuous wall. In particular, when constructing a deep underground continuous wall, the weight of the reinforcing bar is increased, so that the members of the guide frame and rail become thicker, and it becomes necessary to excavate with a wider width.

  In the case of building with a crane without using the device described in Patent Document 1, in order to move the rebar bar from the center of gravity of the rebar bar to the lateral movement after hanging in the hole, It is possible to shift to the opposite side. In this case, it is necessary to attach a weight to the reinforcing bar so as to prevent the reinforcing bar from being tilted. However, depending on the size of the underground object, a heavy weight is necessary to suppress the inclination of the reinforcing bar, and the crane may need to be enlarged.

  The present invention has been made in view of the above circumstances, and eliminates the need for excessive excavation and enlargement of the crane when building the core material of the underground continuous wall in the excavation hole under the underground buried object. Is an issue.

In order to solve the above-mentioned problem, the hanging jig according to the present invention is a hanging jig used when the core material of the underground continuous wall is built under the underground buried object. An upper cross member suspended from the construction machine and extending in the horizontal direction, a vertical member extending downward from the upper cross member, and the core joined to the vertical member and extending laterally below the upper cross member A lower cross member on which a material is suspended, and when the core material is built under the underground buried object, the upper buried member and the lower lateral member serve as the underground buried object. and a structure sandwiching vertically, is installed in the crosspiece of the upper, characterized in that it comprises a support member which is movably supported on a pair of guide walls constructed across the borehole, the.

In the construction method of the core material of the underground continuous wall according to the present invention, in the construction of the underground continuous wall passing under the underground buried object, the core material of the underground continuous wall is used for the underground buried object. A method of building a core material of an underground continuous wall to be built, comprising an upper cross member suspended from a core builder and extending in a lateral direction, and a vertical member extending downward from the upper cross member A structure having a lower cross member joined to the vertical member and extending in a lateral direction below the upper cross member and from which the core member is suspended , and a drilling hole installed in the upper cross member And a supporting member that is movably supported on a pair of guide walls constructed with a sandwich between the upper cross member and the lower cross member. The core material is built under the underground buried object by moving it toward the underground buried object so as to sandwich the buried object vertically. And butterflies.

  In the method of building the core material of the underground continuous wall, the hanging jig is coupled to the upper cross member and is hung on the opening edge of the guide wall to apply the load of the hanging jig and the core material. A support member that is supported by a guide wall may be provided, and the support member is attached to an opening edge of the guide wall in the vicinity of the underground object by the core material builder. A step of lowering until it is hung, and the suspension jig supported by the guide wall via the support member and the core material are moved toward the underground object along the guide wall by a traction mechanism. And a process.

Moreover, the construction system of the underground continuous wall core material according to the present invention is the construction of the underground continuous wall that passes under the underground buried object, and the core material of the underground continuous wall is used for the underground buried object. A core building system for underground continuous walls to be built below, a core building machine installed on the ground, and an upper cross member suspended from the core building machine and extending in the lateral direction A vertical member extending downward from the upper cross member, and a lower cross member which is joined to the vertical member and extends in the horizontal direction below the upper cross member and the core member is suspended. A structure that is used to sandwich the underground object vertically between the upper cross member and the lower cross member when a material is built under the underground object, and the upper member installed in crosspiece, the support member is movably supported on a pair of guide walls constructed across the borehole, and Tutsi device comprising Provided.

  ADVANTAGE OF THE INVENTION According to this invention, when building the core material of an underground continuous wall in the excavation hole under a buried object, excessive excavation and the enlargement of a crane can be made unnecessary.

It is an elevation sectional view showing the building system of the reinforcing bar cage concerning one embodiment. It is 2-2 sectional drawing of FIG. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. It is an elevational view showing a hanging jig 100 according to one embodiment. FIG. 5 is a sectional view taken along line 5-5 in FIG. 4. It is a top view which shows the hanging jig which concerns on one Embodiment. It is an elevation view which shows the procedure of constructing an underground continuous wall. It is an elevation view which shows the procedure of constructing an underground continuous wall. It is an elevation view which shows the procedure of constructing an underground continuous wall. It is an elevation view which shows the procedure of constructing an underground continuous wall. It is an elevation view which shows the procedure of constructing an underground continuous wall. It is an elevation view which shows the procedure of constructing an underground continuous wall. It is an elevation view which shows the procedure of constructing an underground continuous wall.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an elevational sectional view showing a building system 10 for a reinforcing bar 1 according to an embodiment, FIG. 2 is a sectional view taken along the line 2-2 in FIG. 1, and FIG. It is sectional drawing. As shown in these drawings, the built-in system 10 according to the present embodiment is embedded in the underground wall in the construction of the underground continuous wall 2 passing under the underground object 2 such as water, electricity, gas pipes and tunnels. It is used to build the reinforcing bar 1 in the excavation hole 3 formed by a watermark moat under the object 2 and the excavation hole 4 formed in the vicinity thereof.

  The guide wall 6 is constructed so as to pass over the underground object 2, and the groove 5 between the guide walls 6 overlaps with the excavation hole 3 below the underground object 2 and the excavation hole 4 in the vicinity thereof. It extends like so. A step portion 6A is formed at the upper end of the guide wall 6, and a low friction and low wear plate 7 such as a stainless steel plate is joined to the step portion 6A. A pair of rails 8 are installed along the groove 5 on the upper surface of the guide wall 6.

  The erection system 10 includes a rebar piercing machine 20 that is used when lowering the reinforcing bar 1 into the digging hole 4, a hanging jig 100 that is used when building the reinforced bar 1 into the digging hole 3, and a digging hole. 4 is provided with a traction mechanism 30 that is used when the reinforcing bar 1 lowered to 4 is laterally moved to the excavation hole 3 below the underground buried object 2. Here, the construction of the present embodiment is performed at a site with a low head (for example, the height from the work floor to the sky structure is 5 to 10 m) where the structure exists above the excavation holes 3 and 4. Therefore, a low head-compatible machine is used as the rebar erection machine 20.

  The reinforcing bar construction machine 20 includes four legs 22, a frame 26 that connects the upper ends of the four legs 22, and a winch 28 that is installed on the frame 26. The four leg portions 22 are arranged so as to ride two on each rail 8. A wheel 24 is provided at the bottom of the leg 22, and the wheel 24 rolls along the rail 8. In addition, the winch 28 moves up and down the object attached to the tips of the four wires 29 by unwinding and winding the four wires 29.

  The traction mechanism 30 includes a plurality of (three in this embodiment) center hole jacks 32, an anchor member 34 (see FIG. 2) for fixing the plurality of center hole jacks 32 to the stepped portion 6A of the guide wall 6, A PC steel material 36 inserted through each center hole jack 32 and a plurality (three in this embodiment) of fixtures 38 for fixing one end of the PC steel material 36 to the hanging jig 100 are provided. The anchor member 34 is a steel plate whose longitudinal direction is the width direction of the groove 5, and both longitudinal ends of the anchor member 34 are fixed to the stepped portion 6 </ b> A.

  The plurality of center hole jacks 32 are fixed to the upper surface of the anchor member 34 in the longitudinal direction of the anchor member 34 (the width direction of the groove 5). The plurality of fixtures 38 are fixed to the hanging jig 100 in the width direction of the groove 5. Here, the plurality of center hole jacks 32 and the plurality of fixtures 38 are arranged such that the PC steel materials 36 extend along the groove 5 in parallel to each other. Thereby, the suspension jig 100 moves laterally along the groove 5 by the operation of the plurality of center hole jacks 32.

  4 is an elevation view showing the hanging jig 100, and FIG. 5 is a sectional view taken along the line 5-5 in FIG. FIG. 6 is a plan view showing the hanging jig 100. As shown in these drawings, the hanging jig 100 includes a pair of U-shaped structures 110 arranged in parallel to each other and a plurality of (three in this embodiment) that join the upper portions of the pair of structures 110. Supporting members 102, a plurality (four in this embodiment) of suspension pieces 104 attached to the upper part of the structure 110, and a plurality (eight in this embodiment) of suspension pieces 104 attached to the lower part of the structure 110. A muscle 106 and the plurality of fixtures 38 are provided.

  The structure 110 includes an upper cross member 111 and a lower cross member 112, and a vertical member 113 that joins one end in the axial direction thereof. The upper and lower cross members 111 and 112 are H-shaped steels and are arranged in parallel to each other. The upper and lower cross members 111 and 112 are arranged such that the flanges 111F and 112F are horizontal.

  The vertical member 113 has a configuration in which a plurality (four in this embodiment) of H-shaped steel 113A is connected, and a pair of flanges 113F are arranged so as to face the axial direction of the horizontal members 111 and 112. A steel plate 113L is welded to the lower end of the lowermost H-shaped steel 113A, and this steel plate 113L is fixed to the upper flange 112F of the lower cross member 112 with bolts. Further, a steel plate 113U is welded to the upper end of the uppermost H-shaped steel 113A, and this steel plate 113U is fixed to the lower flange 111F of the upper cross member 111 with bolts.

  The joint 114 that connects the upper and lower H-shaped steel 113A includes a pair of steel plates 114A that sandwich the web 113W of the upper and lower H-shaped steel 113A, a steel plate 114B that sandwiches the flange 113F of the upper and lower H-shaped steel 113A, and a pair of steel plates 114C. . A plurality of bolt holes are respectively formed in one end of the web 113W in the longitudinal direction and the steel plate 114B, the pair of steel plates 114A are arranged so as to straddle the upper and lower webs 113W, and the pair of steel plates 114A and the web 113W therebetween are provided. It is fastened by a bolt 114D.

The steel plate 114B is a plate having the same width as that of the outer surface of the flange 113F, and the steel plate 114C is a plate having a width about ½ of the steel plate 114B. Bolt holes are formed in one end in the longitudinal direction of the flange 113F and the steel plates 114B and 114C, and the steel plate 114B and the steel plate 114C are arranged so as to straddle the upper and lower flanges 113F, and the steel plates 114B and 114C and the flange 113F therebetween. Are fastened with bolts 114E.

  The plurality of support members 102 are H-shaped steel and are arranged in parallel to each other at equal intervals. The plurality of support members 102 extend in a direction orthogonal to the cross member 111 and are arranged so that the flange 111F is horizontal. The lower flange 102F of each support member 102 is fastened to the upper flange 111F of the cross member 111 with a bolt. In addition, a fixing tool 38 is disposed on the front end portion of the cross member 111, and the fixing tool 38 is coupled to the upper flange 111F of the cross member 111 with a bolt.

  The axial length of the support member 102 is set so that both axial ends of the support member 102 can be placed on the stepped portion 6 </ b> A of the guide wall 6. As a result, the load of the hanging jig 100 can be supported by the guide wall 6 with both axial ends of the support member 102 placed on the stepped portion 6A. Note that it is not essential to provide the step portion 6A on the guide wall 6 and put both ends of the support member 102 in the axial direction on the step portion 6A, and both end portions in the axial direction of the support member 102 may be put on the upper surface of the guide wall 6. .

  A low-friction plate material 103 such as a Teflon plate is joined to both longitudinal ends of the lower flange 102F of the support member 102, and the low-friction and low-abrasion plate 7 joined to the step portion 6A. It is in contact. As a result, the frictional force between the axial ends of the support member 102 and the stepped portion 6A is reduced, so that the suspension jig 100 can be slid on the guide wall 6 by operating the traction mechanism 30. It has become. Note that it is not essential to join the low-friction plate member 103 such as a Teflon plate to both ends in the longitudinal direction of the flange 102F on the lower side of the support member 102. Instead, a roller for moving a heavy object may be provided.

  Here, the distance between the upper and lower cross members 111 and 112 is such that the upper cross member 111 is positioned above the underground object 2 and the lower cross member 112 is positioned below the underground object 2. (That is, the length of the vertical member 113), the depth of the step portion 6A, and the like are set. Accordingly, when the traction mechanism 30 is operated to move the hanging jig 100 from the excavation hole 4 to the underground object 2 side, the hanging jig 100 moves the underground object 2 with the upper and lower cross members 111 and 112. It will be in a state of being sandwiched up and down.

  The suspension piece 104 is disposed between the support members 102 adjacent to each other, and is fixed to the upper flange 111 </ b> F of the upper cross member 111. Here, the plurality of suspension pieces 104 are attached with the plurality of wires 29 of the rebar piercing machine 20, and the plurality of suspension pieces 104 are equally spaced along a circle centered on the center of gravity of the rebar rebar 1. It is arranged with. That is, the plurality of hanging points of the hanging jig 100 are arranged so that the reinforcing bar 1 can be suspended from the reinforcing bar built-in machine 20 in a balanced manner.

  A pair of nuts 107 for attaching a pair of suspension bars 106 are provided at one end and the other end of the lower cross member 112 in the axial direction. A pair of holes are formed at both ends in the longitudinal direction of the lower flange 112F of the cross member 112 with the web 112W interposed therebetween, and the nut 107 is welded to the upper surface of the flange 112F coaxially with the hole. The upper end of the suspension bar 106 is inserted into the hole and screwed into the nut 107, and the lower end of the suspension bar 106 is fixed to the upper end of the reinforcement bar of the reinforcing bar 1 by a fixing bracket (not shown).

  A pair of couplers 109 for attaching a pair of suspension bars 108 (see FIG. 8) to be described later are provided at two intermediate points in the axial direction of the lower cross member 112. A pair of holes are formed at two points in the longitudinal direction of the flange 112F on the upper side of the cross member 112 with the web 112W interposed therebetween, and the coupler 109 is welded to the lower surface of the flange 112F coaxially with the hole. . The lower end of the suspension bar 108 is inserted into the hole and screwed into the coupler 109.

  Further, a reinforcing bracket 115 is provided at the corner between the upper end of the vertical member 113 and the upper horizontal member 111, and a reinforcing bracket 116 is provided at the corner between the lower end of the vertical member 113 and the lower horizontal member 112. ing.

  7 to 13 are elevation views showing a procedure for constructing the underground continuous wall. First, although not shown in the figure, a drilling hole 4 is formed in the vicinity of the underground buried object 2, and a excavator for excavation is installed in the drilling hole 4. The excavation hole 3 is formed in. Prior to excavation, the guide wall 6 is constructed from the work floor to a predetermined depth (for example, 1 to 2 m). A pair of rails 8 are installed on the upper surface of the guide wall 6.

  Next, as shown in FIG. 7, the reinforcing bar construction machine 20 is installed above the excavation hole 4. Then, the reinforcing bar rod 1 is lowered into the excavation hole 4 using the reinforcing bar rod built-in machine 20. Here, the construction of the present embodiment is performed at a low head position where the height from the work floor to the structure in the sky is lower than the total length of the reinforcing bar 1. Therefore, in this embodiment, the reinforcing bar 1 is extended downward while connecting the element 1B obtained by dividing the reinforcing bar 1 in the height direction.

  In this step, the pair of hairpins 118 is supported by the pair of hairpins 118 by inserting the pair of hairpins 118 between the steel plate 1A of the reinforcing bar 1 and the upper surface of the guide wall 6 so as to be orthogonal to the groove 5. To do. In this state, the element 1B is connected on the reinforcing bar 1.

  Then, when the reinforcing bar 1 extends to the full length, the structure 110 ′ being assembled consisting of the lower cross member 112 and the lowermost H-shaped steel 113 </ b> A is suspended from the reinforcing bar anchoring machine 20. Further, the suspension bar 108 is screwed into the nut 107 of the structure 110 ′ being assembled, and the lower end of the suspension bar 108 is fixed to the upper end of the reinforcing bar of the reinforcing bar 1 with a fixing bracket.

  A bracket 108A for attaching the wire 29 is provided at the upper end of the hanging bar 108. The lower end of the hanging bar 108 is screwed into the coupler 109, and the wire 29 is attached to the bracket 108A. 'Is hung from the rebar erection machine 20.

  Next, the newly connected H-shaped steel 113 </ b> A is conveyed onto the H-shaped steel 113 </ b> A of the structure 110 ′ being assembled by the forklift 9, and the upper and lower H-shaped steel 113 </ b> A is connected by the joint 114. Here, the steel plates 114A, 114B, 114C of the joint 114 are fixed to the lower ends of the H-shaped steel 113A to be newly connected by bolts 114D, 114E, and the newly connected H-shaped steel 113A is the H-shaped steel 113A of the structure 110 ′. After being lowered, the steel plates 114A, 114B, 114C are fixed to the upper end of the H-shaped steel 113A of the structure 110 ′ with bolts 114D, 114E).

  Next, the reinforcing bar rod 1 and the structure 110 ′ being assembled are lowered by the length of the H-shaped steel 113 </ b> A by the reinforcing bar rod mounting machine 20. Then, the H-shaped steel 113A of the longitudinal member 113 is connected in the above-described procedure, and the reinforcing bar 1 and the structure 110 ′ being assembled are lowered. In this manner, the H-shaped steel 113A is connected and the rebar 1 and the structure 110 ′ being assembled are lowered.

  Then, as shown in FIG. 8, when the assembling of the longitudinal member 113 is completed while leaving the uppermost H-shaped steel 113 </ b> A, the pair of load receivers 120 are installed on the guide wall 6 so as to span the groove 5. Each load receiver 120 is composed of a pair of H-shaped steels 121. On the other hand, a nut 122 is attached to the hanging bar 108.

  In this step, the pair of H-shaped steels 121 are arranged in parallel so that the flange 108 is horizontal and the hanging bar 108 is sandwiched therebetween. And a pair of H-shaped steel 121 is couple | bonded with a fixing metal fitting, and the suspension bar 108 is fixed to the load receiver 120 by abutting the nut 122 on the upper flange and tightening. Then, the wire 29 of the reinforcing bar construction machine 20 is removed from the bracket 108 </ b> A of the hanging bar 108. Thereby, the load of the rebar rod 1 is transferred from the rebar rod builder 20 to the pair of load receivers 120.

  Next, the assembly of the structure 110 is completed by assembling the member obtained by integrating the upper cross member 111 and the uppermost H-shaped steel 113A into the structure 110 ′ being assembled. Then, a plurality of support members 102 are installed on the pair of upper cross members 111. The hanging piece 104 and the fixture 38 are attached to the cross member 111 in advance.

  Next, as shown in FIG. 9, the wire 29 of the reinforcing bar rod mounting machine 20 is attached to the hanging piece 104 of the hanging jig 100, and the reinforcing bar rod 1 and the hanging jig 100 are supported by the reinforcing bar rod mounting machine 20. Lower 102 until it hits the stepped portion 6A. Then, the wire 29 is removed from the suspension piece 104 and the rebar piercing machine 20 is retracted from above the excavation hole 4. As a result, the reinforcing bar 1 is supported by the guide wall 6 via the hanging jig 100.

  Then, the center hole jack 32 and the anchor member 34 (see FIG. 2) are installed on the stepped portion 6A of the guide wall 6, one end of the PC steel material 36 is fixed to the fixture 38, and the PC steel material 36 is attached to the center hole jack 32. Pass through.

  Next, as shown in FIG. 10, the center hole jack 32 is operated to move the hanging jig 100 and the reinforcing bar 1 from the excavation hole 4 to the underground object 2 side. At this time, the rebar 1 is moved to the excavation hole 3 below the underground object 2 by moving the hanging jig 100 so that the underground object 2 is vertically sandwiched between the upper and lower cross members 111 and 112. Let

  Next, as shown in FIG. 11, the reinforcing bar construction machine 20 is installed above the excavation hole 4. Then, the reinforcing bar rod 1 is lowered into the excavation hole 4 using the reinforcing bar rod built-in machine 20. Here, also in this step, the reinforcing bar 1 is built into the excavation hole 4 while connecting the element 1B and extending the reinforcing bar 1 downward.

  When the reinforcing bar 1 is extended to the full length, the hanging bar 108 is attached to the upper end of the reinforcing bar 1 with a fixing bracket in a state where the reinforcing bar 1 is supported by a pair of hairpins 118 (see FIG. 7). Twenty wires 29 are attached to the bracket 108 </ b> A of the hanging bar 108. Then, the steel plate 118 is removed and the rebar rod 1 is lowered by the rebar rod building machine 20.

  Then, as shown in FIG. 12, the pair of load receivers 120 are installed on the guide wall 6 so as to span the groove 5. In this step, the pair of H-shaped steels 121 are arranged in parallel so that the flange 108 is horizontal and the suspension bar 108 is sandwiched between them. And a pair of H-shaped steel 121 is couple | bonded with a fixing metal fitting, and the suspension bar 108 is fixed to the load receiver 120 by abutting the nut 122 on the upper flange and tightening. Then, the wire 29 of the reinforcing bar construction machine 20 is removed from the bracket 108 </ b> A of the hanging bar 108. Thereby, the load of the rebar rod 1 is transferred from the rebar rod builder 20 to the pair of load receivers 120.

  Thereafter, as shown in FIG. 13, the tremely pipe 124 is inserted into the excavation hole 4 and concrete is placed in the excavation hole 4 and the excavation hole 3. Thereby, one element of the underground continuous wall is constructed.

  As described above, the hanging jig 100 according to this embodiment includes the upper cross member 111 that is suspended from the reinforcing bar construction machine 20 and extends in the lateral direction, and the vertical member 113 that extends downward from the upper cross member 111. And a lower cross member 112 which is joined to the vertical member 113 and extends in the horizontal direction below the upper cross member 111 and on which the reinforcing bar 1 is suspended. Here, when the reinforcing bar 1 is built under the underground object 2, the hanging jig 100 sandwiches the underground object 2 between the upper cross member 11 and the lower cross member 112 in the vertical direction.

  Thus, a plurality of suspension points are arranged around the center of gravity of the reinforcing bar 1 and the reinforcing bar 1 is suspended from the reinforcing bar anchoring machine 20 in a well-balanced manner without greatly tilting. The excavation hole 4 in the vicinity of the buried object 2 can be moved to the excavation hole 3 below the buried object 2. Therefore, it is unnecessary to attach a weight to the reinforcing bar 1 to balance the reinforcing bar 1 and to prevent an increase in the size of the crane due to the influence of the weight of the weight. The weight of the lifting jig 100 is extremely small compared to the weight of the reinforcing bar 1, and the weight of the weight for correcting the inclination of the reinforcing bar 1 is much higher than the weight of the hanging jig 100. growing.

  Further, the portion inserted into the excavation holes 3 and 4 of the hanging jig 100 does not protrude outside the width of the reinforcing bar 1. Therefore, excessive excavation such as excavation with a width wider than the wall thickness of the underground continuous wall can be eliminated.

  Moreover, in the hanging jig 100 according to the present embodiment, the vertical member 113 has a configuration in which a plurality of H-shaped steels 113A shorter than the entire length are connected in the length direction, and the lower cross member 112 is a reinforcing bar rod. A coupler 109 to which a suspension bar 108 suspended from the construction machine 20 is attached is provided. As a result, the reinforcing bar 1 can be hung from the reinforcing bar-building machine 20 through the lower cross member 112 and the hanging bar 108 attached thereto.

  Here, in this embodiment, since there is a head limitation, in addition to using the low-headed steel bar construction machine 20, the height dimension of the hanging jig 100 is from the work floor to the winch 28. It is larger than the height. Therefore, when the H-shaped steel 113A is connected and the longitudinal member 113 is extended, the reinforcing bar 1 and the reinforcing bar 1 are suspended in a state where the reinforcing bar 1 is suspended, by repeatedly lowering the reinforcing bar 1 and the structure 110 ′ being assembled. The structure 110 is assembled with the winch 28. As a result, the reinforcing bar 1 can be built into the excavation hole 3 using the hanging jig 100 having a large dimension in the height direction regardless of the empty head restriction.

  Moreover, the building system 10 of the reinforcing bar 1 according to this embodiment includes the reinforcing bar building machine 20 installed on the ground and the above-described hanging jig 100. As a result, the reinforcing bar 1 is moved to the underground buried object 2 side by sandwiching the underground buried object 2 between the upper horizontal member 111 and the lower horizontal member 112 so that the reinforcing bar 1 is grounded. It can be built under the buried object 2.

  Further, the hanging jig 100 is coupled to the upper cross member 111 and is hung on the opening edge (stepped portion 6A) of the guide wall 6 to support the load of the hanging jig 100 and the reinforcing bar 1 on the guide wall 6. The building system 10 includes the member 102 and moves the suspension jig 100 and the reinforcing bar 1 supported by the guide wall 6 via the support member 102 to the underground object 2 side along the guide wall 6. A traction mechanism 30 is provided. As a result, the reinforcing bar 1 and the hanging jig 100 are lowered by the reinforcing bar anchor 20 until the support member 102 hits the stepped portion 6A of the guide wall 6 in the vicinity of the underground buried object 2, and the reinforcing bar 1 and The load of the hanging jig 100 is transferred from the rebar erection machine 20 to the guide wall 6, and then the hanging jig 100 and the reinforcing bar 1 supported by the guide wall 6 are transferred to the guide wall 6 by the traction mechanism 30. Along the underground buried object 2 side. Therefore, since the hanging jig 100 and the reinforcing bar 1 can be moved in the lateral direction without using a crane, the reinforcing bar 1 is placed in the excavation hole 4 in the vicinity of the underground buried object 2 at a site where the head is limited. It can be lowered and moved from the excavation hole 4 to the excavation hole 3 below the underground buried object 2.

  In addition, the above-mentioned embodiment is for making an understanding of this invention easy, and does not limit this invention. It goes without saying that the present invention can be changed and improved without departing from the gist thereof, and that the present invention includes equivalents thereof. For example, in the above-described embodiment, the structure 110 is configured so that the upper and lower cross members 111 and 112 extend only in one direction from the upper and lower ends of the vertical member 113. You may comprise 112 in the shape (I shape) extended in both directions from the up-and-down both ends of the vertical material 113. FIG.

  In the above-described embodiment, the pair of structures 110 is provided, but the structure 110 may be one body, or three or more bodies. Moreover, in the above-mentioned embodiment, although the reinforcing bar 1 was mentioned as an example as a core material of an underground continuous wall, H-shaped steel, a steel pipe, etc. are mentioned as this core material. Furthermore, in the above-mentioned embodiment, although concrete was mentioned as a filler with which it fills in the excavation hole in which the reinforcing bar 1 was built, as this filler, the following (1)-(6) are mentioned. .

(1) Concrete (Blast furnace, normal, moderate heat, low heat Portland cement)
(2) High-fluidity, medium-fluidity concrete (3) Bentonite mortar (a mixture of bentonite solution and mortar)
(4) SG (Agitation of self-hardening stabilizer, cement solidified material, bentonite liquid, polymer liquid)
(5) Fluidized soil (mud soil, mud water with cement solidification material added and stirred)
(6) Cement-based solidification liquid (stirring of cement-type solidification liquid and excavation groove stabilization liquid (bentonite liquid, polymer liquid))

  For (1), (2) and (3) above, the tremmy pipe is inserted into the excavation hole and placed (replaced), and for the above (4) and (5), the tremy pipe Then, steel pipes and holes are inserted and placed (replaced). For (6) above, bubble agitation is performed by air blow at the original excavation position.

DESCRIPTION OF SYMBOLS 1 Reinforcement rod, 1A steel plate, 1B element, 2 underground object, 3, 4 excavation hole, 5 groove, 6 guide wall, 6A level difference part, 7 plate, 8 rail, 9 forklift, 10 erection system, 20 rebar rod Built-in machine, 22 legs, 24 wheels, 26 frames, 28 winches, 29 wires, 30 traction mechanisms, 32 center hole jacks, 34 anchor members, 36 PC steel, 38 fixtures, 100 hanging jigs, 102 support members, 102F flange, 103 plate material, 104 suspension piece, 106 suspension bar, 107 nut, 108 suspension bar, 108A bracket, 109 coupler, 110 structure, 111 cross member, 111F flange, 112 cross member, 112F flange, 112W web, 113 vertical Material, 113A H-shaped steel, 113F flange, 113W Web, 113L, 113U Steel plate, 114 Joint, 114A, 114B, 114C Steel plate, 114D, 114E Bolt, 115, 116 Reinforcement bracket, 118 Steel plate, 120 Load receiver, 121 H-shaped steel, 121F Flange, 122 Nut, 124 Toremy tube

Claims (4)

In the construction of the underground continuous wall passing under the underground buried object, the hanging jig used when the core material of the underground continuous wall is built under the underground buried object,
An upper cross member suspended from the core construction machine and extending in the horizontal direction, a vertical member extending downward from the upper cross member, and a horizontal member joined to the vertical member and extending laterally below the upper cross member A lower cross member on which the core material is suspended, and when the core material is built under the underground object, the upper cross member and the lower cross member form the ground. A structure sandwiching an embedded object up and down;
A support member that is installed on the upper cross member and is movably supported on a pair of guide walls constructed with a drill hole interposed therebetween;
A hanging jig characterized by comprising: In the construction of the underground continuous wall that passes under the underground buried object, the core continuous wall core material for building the underground continuous wall core material under the underground buried object,
An upper cross member suspended from the core construction machine and extending in the horizontal direction, a vertical member extending downward from the upper cross member, and a horizontal member joined to the vertical member and extending laterally below the upper cross member A structure including a lower cross member on which the core member is suspended , and a support that is installed on the upper cross member and is movably supported on a pair of guide walls constructed with an excavation hole interposed therebetween. A suspension jig provided with a member, and the suspension jig is moved to the underground object so that the underground object is vertically sandwiched between the upper lateral member and the lower lateral member. The core material is built under the underground object by the above-described method for erection of the core material of the underground continuous wall. The hanging jig includes a support member coupled to the upper cross member and hung on an opening edge of a guide wall to support the load of the hanging jig and the core material on the guide wall,
Lowering the core material and the suspension jig until the support member is hooked on the opening edge of the guide wall in the vicinity of the underground object by the core material building machine;
A step of moving the suspension jig supported by the guide wall through the support member and the core material to the underground object along the guide wall by a traction mechanism;
The building method of the core material of the underground continuous wall of Claim 2 characterized by the above-mentioned. In the construction of the underground continuous wall that passes under the underground buried object, the underground continuous wall core building system for building the underground continuous wall core material under the underground buried object,
A core construction machine installed on the ground;
An upper cross member suspended from the core construction machine and extending in the horizontal direction, a vertical member extending downward from the upper cross member, and a horizontal member joined to the vertical member and extending laterally below the upper cross member A lower cross member on which the core material is suspended, and when the core material is built under the underground object, the upper cross member and the lower cross member form the ground. A suspension provided with a structure used to sandwich an embedded object up and down , and a support member that is installed on the upper cross member and is movably supported on a pair of guide walls constructed with an excavation hole in between A jig,
A building system for a core material of an underground continuous wall characterized by comprising:

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