JP2017179845A - Junction structure and installation method of earth retaining member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an earth retaining member junction structure that prevents a load equal to or higher than weight of an earth retaining member from being applied on a holding member that holds the earth retaining member at a predetermined height.SOLUTION: An earth retaining member junction structure 1 according to this invention is installed in a shaft. The earth retaining member junction structure comprises: a first connection member 3, which connects liner plates 20 with each other in a vertical direction; a cylindrical wall body 2, which is formed into cylinder by connecting multiple liner plates 20; a second connection member 4, which connects the cylindrical wall body 2 and a shaft 81 of a jack 8; and a holding means 5 to hold the cylindrical wall body 2 at a predetermined height. The second connection member 4 is telescopically connected with the first connection member 30, which is disposed at upper most part of the cylindrical wall body 2, in a vertical direction.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a joining structure and an installation method for retaining members provided in a shaft.

  Conventionally, when constructing a shaft such as a deep pile or a drainage well, a retaining member made of a liner plate or the like is used as a retaining wall. Usually, the earth retaining wall using such earth retaining members is constructed by repeating ground excavation work and work in which an operator enters the excavated ground and assembles the earth retaining member from the inside.

  In such conventional earth retaining wall construction technology, the assembly work inside the shaft is dangerous, and since it is an alternate work with ground excavation, the work efficiency is also poor. A method that does not enter the retaining wall is being studied.

  In the liner plate disclosed in Patent Document 1, four support portions are respectively inserted into the recesses of the connecting ring, and the upper surface of the upper flange portion is brought into contact with the back surface of the upper flange portion of the connecting ring, so that the frame Secure to a piece. In the liner plate disclosed in Patent Document 1, the liner plate unit is supported by the four support portions via the connection ring, and the liner plate units are connected to each other outside the shaft through the connection ring. As a result, the liner plate disclosed in Patent Document 1 can be assembled from the outside of the retaining wall.

  Moreover, the liner plate connection structure disclosed in Patent Document 2 is such that an inner-tightening type liner plate is connected via a connector, and the connector includes a pair of flange connection parts and a support part that connects the pair of flange connection parts. The flange connecting portion is provided with a flange connecting hole for fastening the bolt. The coupling tool is formed by coupling and fixing a pair of coupling pieces. The coupling piece includes a flange coupling portion and a support piece that rises from an edge or abdomen of the flange coupling portion. The flange coupling portion has an outer peripheral edge. The support piece is provided with a support piece connecting hole for fastening bolts, and either one of the support pieces is provided on the surface on the inner peripheral side edge side of the flange connecting portion. The nut is fixed by welding, and the support piece connecting hole and the nut hole communicate with each other. Thereby, the liner plate connection structure disclosed in Patent Document 2 can perform the assembling work of the retaining member from the outside of the retaining wall.

  By the way, when constructing the earth retaining wall as described above in the shaft, for example, the earth retaining wall is lowered from above by a jack or the like and installed in the shaft. Then, the retaining wall inserted in the shaft in advance is separated from the jack in a state of being supported by a supporting member that supports a predetermined height, and another retaining wall is connected to the upper stage of the retaining wall. Become. In this way, in order to connect another retaining wall on the retaining wall, the retaining wall connected to the jack is supported by the support member before disconnecting the connection between the jack and the retaining wall. It is necessary to let

  However, when switching the support of the retaining wall from a jack to a supporting member, it is difficult to cause only the weight of the retaining wall to act on the supporting member by operating the jack, and the force to push the retaining wall downward by the jack is supported When acting on the member, there is a problem that the support member is damaged.

JP 2011-58189 A JP 2011-106190 A

  Therefore, the present invention has been devised in view of the above-mentioned problems, and the object of the present invention is to load the retaining member that holds the retaining member at a predetermined height above the weight of the retaining member. An object of the present invention is to provide a structure for joining earth retaining members that prevents the operation of the earth retaining member.

  The earth retaining member joining structure according to the first invention is a structure for connecting earth retaining members provided in a vertical shaft, and includes a first connecting member for vertically connecting the earth retaining members, and a plurality of earth retaining members. A cylindrical wall body formed into a cylindrical shape by connecting members, a second connecting member for connecting the cylindrical wall body and the shaft of the jack, and a holding for holding the cylindrical wall body at a predetermined height Means, and the second connecting member is connected to the first connecting member disposed at the uppermost portion of the cylindrical wall body so as to be extendable in the vertical direction.

  The joining structure of the earth retaining member according to the second invention is the first invention, wherein the second connecting member is connected to the connecting portion connected to the first connecting member, and to the connecting portion so as to be extendable in the vertical direction. And a shaft receiving portion connected to the shaft of the jack.

  According to a third aspect of the present invention, there is provided a structure of the earth retaining member according to the first aspect, wherein the first connecting member includes a pair of first flange plates provided at intervals in the vertical direction, and a pair of the first flange plates. The second connecting member is provided with a face plate provided at a lower end of the second connecting member so as to be separated from the upper first flange plate, and from the upper first flange plate. The first flange plate and the face plate penetrate through a penetrating member having a lower diameter enlarged portion formed by expanding the lower part and an upper diameter enlarged part formed by expanding the diameter above the face plate. And being connected to the first connecting member.

  According to a fourth aspect of the present invention, there is provided the earth retaining member joining structure according to the third aspect, wherein the second connecting member is configured to be rotatable about a horizontal direction as a rotation axis, and the upper first flange plate is notched. It has the notch part formed in this way, It is characterized by the above-mentioned.

  According to a fifth aspect of the present invention, there is provided the earth retaining member joining structure according to the third aspect or the fourth aspect, wherein the penetrating member comprises a bolt and a nut.

  According to a sixth aspect of the present invention, there is provided the earth retaining member joining structure according to the first aspect, wherein the first connecting member has a first rib plate extending in the vertical direction, and the second connecting member extends in the vertical direction. The second rib plate is connected to the first rib plate so as to be extendable in the vertical direction.

  The installation method of the earth retaining member according to the seventh invention is an installation method of the earth retaining member in which the earth retaining member is installed in the shaft, and the earth to which the joining structure of the earth retaining member according to claims 1 to 6 is applied. The fastening member is lowered by a jack.

  According to an eighth aspect of the present invention, there is provided a method for installing the earth retaining member according to the seventh aspect, wherein after the earth retaining member is lowered to the hole bottom of the shaft by a jack, the hole bottom is excavated.

  According to 1st invention-8th invention, it becomes possible to prevent that the load beyond the weight of a retaining member acts on the retaining member which hold | maintains a retaining member at predetermined | prescribed height.

It is a figure which shows the joining structure of the earth retaining member to which this invention is applied. (A) is a perspective view which shows the liner plate of FIG. 1, (b) is the side view, (c) is the top view. (A) is a perspective view which shows the 1st connection member of FIG. 1, (b) is the sectional drawing. It is a perspective view which shows the cylindrical wall body of FIG. It is the figure which expanded and showed the state which connected the cylindrical wall bodies of FIG. FIG. 2 is a partially enlarged view of FIG. 1. (A) is a figure which shows the state which hold | maintained the cylindrical wall body with the jack in the joining structure of the earth retaining member to which this invention is applied, (b) is a figure which shows the cylindrical wall body which lowered | hung to the holding member The state which made it contact is shown, (c) has shown the state which stopped the descent | fall by a jack. It is a figure which shows the modification of the joining structure of the earth retaining member which concerns on this invention. (A) is a perspective view which shows the 1st connection member of FIG. 8, (b) is the sectional drawing. It is a figure which shows the state which connected the cylindrical wall bodies of FIG. (A) is a figure which shows the state which hold | maintained the cylindrical wall body with the jack in the modification of the joining structure of the earth retaining member which concerns on this invention, (b) lowered | hung the cylindrical wall body The state is shown, and (c) shows a state where the descent by the jack is stopped. It is a figure which shows the other modification of the joining structure of the earth retaining member which concerns on this invention. (A) is a perspective view which shows the 1st connection member of FIG. 12, (b) is the sectional drawing. (A) shows the state which hold | maintained the cylindrical wall body with the jack in the other modification of the joining structure of the earth retaining member which concerns on this invention, (b) is the state which lowered | hung the jack and stopped (C) has shown the state which rotated the 2nd connection member. (A) is the other modification of the joint structure of the earth retaining member according to the present invention, in particular, shows a modification of the penetrating member, and shows a state in which the cylindrical wall body is held by a jack, (b) The state where the jack is lowered and stopped is shown.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out a structure for joining earth retaining members to which the present invention is applied will be described in detail with reference to the drawings. Below, what applies a liner plate as an earth retaining member is illustrated and demonstrated.

  FIG. 1 is a view showing a joining structure 1 for a retaining member to which the present invention is applied.

  The joining structure 1 is provided in the shaft 100 and includes the first connecting member 3 that connects the liner plates 20 in the vertical direction, and a plurality of liner plates 20 are connected and formed in a cylindrical shape. The cylindrical wall body 2, the 2nd connection member 4 which connects the cylindrical wall body 2 and the shaft 81 of the jack 8, and the holding member 5 which hold | maintains the cylindrical wall body 2 to predetermined | prescribed height are provided.

  The vertical shaft 100 is a hole excavated with the ground facing downward using an excavating machine such as a clamshell. The shaft 100 is provided with a cylindrical wall body 2 and a foundation hole 101 having a diameter larger than that of the cylindrical wall body 2.

  The base hole 101 is a hole excavated in the ground with a predetermined depth (for example, about 1.5 meters) and a predetermined inner diameter (for example, about 4.0 meters). The foundation hole 101 is provided with a foundation platform 102 having an H-shaped steel ring at the bottom of the hole, and an earth retaining wall 103 made of a corrugated cylindrical liner plate. In the base hole 101, a pedestal 90 that supports a jack 8 (described later) and the holding member 5 is erected on the bottom of the hole.

  In addition, the foundation hole 101 is provided with a scaffold 99 for workers used in connecting the cylindrical wall bodies 2 to each other in a circular shape along the earth retaining wall 103.

  The gantry 90 is made of an H-shaped steel extending in the vertical direction, and is disposed below the jack mounting portion 91 with a jack mounting portion 91 made of a grooved steel extending in the horizontal direction toward the center of the shaft 100. And a holding member mounting portion 92 made of H-shaped steel that extends in the horizontal direction toward the center of the vertical shaft 100. In addition, although the two mounts 90 are illustrated around the cylindrical wall body 2, the quantity may be any quantity. Further, the jack mounting portion 91 may be anything as long as the jack 8 can be mounted. The holding member attaching portion 92 may be any member as long as the holding member 5 is attached.

  2A is a perspective view showing the liner plate 20 of FIG. 1, FIG. 2B is a side view thereof, and FIG. 2C is a plan view thereof.

  The liner plate 20 includes a corrugated steel plate 21 that is corrugated in the vertical direction, a circumferential flange 22 that is provided at the upper and lower ends of the corrugated steel plate 21, and axial flanges 23 that are provided at both ends of the corrugated steel plate 21.

  The circumferential flange 22 has a plurality of circumferential connecting holes 22a formed of circular holes. The circumferential flange 22 is formed in a fan shape in plan view.

  The axial flange 23 is formed with a plurality of axial connection holes 23a each formed of a circular hole, and a plurality of external fastening axial connection holes 23b.

  FIG. 3A is a perspective view showing the first connecting member 3 of FIG. 1, and FIG. 3B is a cross-sectional view thereof.

  The first connecting member 3 is formed by bending a grooved steel having a U-shaped cross-sectional shape, and is open toward the outside. The first connecting member 3 includes a pair of first flange plates 31 provided at intervals in the vertical direction and a first web plate 32 that connects the pair of first flange plates 31 to each other.

  The first flange plate 31 is made of a plate material whose in-plane direction extends in the horizontal direction, and is formed in a fan shape in plan view. The first flange plate 31 has a plurality of first flange connection holes 31a formed of circular holes.

  The 1st web board 32 consists of a board | plate material extended in the up-down direction, and is formed in circular arc shape by planar view. The first web plate 32 is integrally formed with the end portion on the inner peripheral side of the first flange plate 31 at the upper end and the lower end, respectively.

  FIG. 4 is a perspective view showing the cylindrical wall body 2 of FIG.

  The cylindrical wall body 2 is used as a retaining wall such as a deep foundation pile or a drainage well. In the cylindrical wall body 2, the axial flanges 23 of the liner plates 20 adjacent in the lateral direction are brought into contact with each other, and the respective axial connection holes 23 a are aligned. The cylindrical wall body 2 is configured such that the shafts of the bolts 61 are passed through the aligned axial connection holes 23a, and nuts 62 are screwed onto the ends of the bolts 61 to connect the liner plates 20 to each other. Is formed in a cylindrical shape with an outer diameter of 1.8 meters (the example is 1.8 meters, but may be 2.5 meters, 3 meters, or larger, for example).

    The cylindrical wall body 2 is arranged in place of connecting the liner plates 20 to each other by aligning the axial connection holes 23a to pass through the shaft of the bolt 61 and screwing the nut 62 to the tip of the bolt 61. The liner plate 20 may be connected to each other by aligning the outer tightening axial connection holes 23b and penetrating the shaft of the bolt 61 and screwing the nut 62 to the tip of the bolt 61. In that case, the liner plates 20 can be connected to each other from the outside of the cylindrical wall body 2.

  In addition, the cylindrical wall body 2 aligns the circumferential connection holes 22a by bringing the circumferential flanges 22 of the liner plates 20 adjacent in the vertical direction into contact with each other. In the cylindrical wall body 2, the shaft of the bolt 61 is passed through the aligned circumferential connection hole 22 a, and a nut 62 is screwed to the tip of the bolt 61 to connect the liner plates 20 to each other in two stages in the vertical direction. Let

  The cylindrical wall body 2 contacts the circumferential flange 22 of the upper liner plate 20 with the first flange plate 31 on the lower side of the first coupling member 3 to connect the circumferential coupling hole 22a and the first flange coupling. The holes 31a are aligned. The cylindrical wall body 2 is formed by passing the shaft of the bolt 61 through the aligned circumferential connecting hole 22a and the first flange connecting hole 31a, and screwing the nut 62 to the tip of the bolt 61, so that the liner plate 20 And the first connecting member 3 are connected in the vertical direction.

  Similarly, the cylindrical wall body 2 is configured such that the first flange plate 31 on the upper side of the first connecting member 3 is brought into contact with the circumferential flange 22 of the lower liner plate 20, and the circumferential connecting hole 22 a It is aligned with the 1 flange connecting hole 31a. The cylindrical wall body 2 is formed by passing the shaft of the bolt 61 through the aligned circumferential connecting hole 22a and the first flange connecting hole 31a, and screwing the nut 62 to the tip of the bolt 61, so that the liner plate 20 and the 1st connection member 3 are connected to an up-down direction.

  In addition, although the cylindrical wall body 2 which concerns on this embodiment illustrated what connected the liner plate 20 to 2 steps | paragraphs in the up-down direction, the cylindrical wall body which concerns on this invention has 2 liner plates in the up-down direction. It may be connected to more than one stage. Further, the cylindrical wall according to the present invention may have a cylindrical shape constituted by one stage by connecting the axial flanges to each other without connecting the liner plate in the vertical direction. Good.

  The cylindrical wall body 2 is formed in a cylindrical shape by connecting a plurality of arc-shaped liner plates 20 in a plan view, but is not limited thereto. For example, a cylindrical wall body according to the present invention connects arc-shaped liner plates in a semicircular shape, and connects liner plates formed linearly between the semicircular liner plates. In addition, it may be formed in an oval cylindrical shape in plan view. In addition, the cylindrical wall body according to the present invention may be formed in a cylindrical shape having a rectangular shape in plan view by connecting a plurality of linear liner plates.

  FIG. 5 is an enlarged view showing a state in which the cylindrical wall bodies 2 of FIG. 1 are connected to each other.

  As shown in FIG. 5, when it is set as the cylindrical wall body 2a below and the cylindrical wall body 2b provided above the cylindrical wall body 2a, the upper first flange plate 31 and the cylinder in the cylindrical wall body 2a The bottom flange plate 31 of the wall 2b is in contact with the lower flange plate 31 and the bolts 61 are passed through the respective first flange connection holes 31a whose positions are aligned, and nuts 62 are screwed into the cylinders. The shaped wall bodies 2a and 2b are connected to each other.

  As described above, the cylindrical wall bodies 2 a and 2 b are connected to the first connecting members 3 formed in a U-shaped cross section with the outer peripheral side opened from the outer peripheral side of the liner plate 20. Since the connection between the cylindrical wall bodies 2a and 2b is an outer fastening, it is possible to safely connect the cylindrical wall body 2 in the vertical direction without an operator entering the inside of the cylindrical wall body 2. Become.

  Here, the inner tightening refers to connecting the liner plate 20 from the inner peripheral side, and the outer tightening refers to connecting the liner plate 20 from the outer peripheral side.

  FIG. 6 is an enlarged view of FIG.

  The 2nd connection member 4 is connected with the 1st connection member 3 arrange | positioned at the uppermost part of the cylindrical wall body 2 so that it can expand-contract vertically. The second connecting member 4 includes a connecting portion 41 connected to the first connecting member 3, and a shaft receiving portion 43 connected to the connecting portion 41 via a shaft member 42 having a circular cross section with the horizontal direction as a rotation axis. Have The second connecting member 4 is configured such that the connecting portion 41 and the shaft receiving portion 43 are connected via the shaft member 42 so as to be rotatable about the horizontal direction as a rotation axis.

  Fig.7 (a) is a figure which shows the state which hold | maintained the cylindrical wall body in the joining structure 1 of the earth retaining member to which this invention is applied with the jack.

  The connecting portion 41 is made of metal, and the shaft member 42 is inserted therethrough, and a connecting portion hole 41a formed of a long hole extending in the vertical direction is formed.

  The connecting portion 41 is provided with a face plate 44 to which an angle steel is attached to the lower end thereof by welding, and an in-plane direction of the two plate materials forming the angle steel is extended in the horizontal direction.

  The face plate 44 is formed in an arc shape in a plan view, like the upper first flange plate 31 formed in an arc shape in a plan view. The face plate 44 has a face plate hole 44a formed in a circular shape.

  The face plate 44 is disposed to face the upper first flange plate 31 in the first connecting member 3. The face plate 44 is inserted into the upper first flange plate 31 by passing the bolt 61 through the face plate hole 44a and the upper first flange connecting hole 31a of the first connecting member 3 and screwing the nut 62 therethrough. Connected.

  The shaft receiving portion 43 is made of metal, and is connected to the connecting portion 41 so as to be vertically extendable and connected to the tip of the shaft 81 of the jack 8. The shaft receiving portion 43 is formed with a circular receiving portion hole 43a through which the shaft member 42 is inserted.

  The jack 8 is composed of a double-acting hydraulic jack and has a shaft 81 extending in the vertical direction. In the jack 8, the shaft 81 is movable in the vertical direction, and raises and lowers the cylindrical wall body 2 connected in the vertical direction inside the shaft 100.

  The holding member 5 is made of H-shaped steel, and is arranged such that the in-plane direction of the flange of the H-shaped steel is the horizontal direction. The holding member 5 is bolted to the holding member mounting portion 92 of the gantry 90 via bolts 61 and nuts 62, and the holding member mounting portion 92 is attached to the holding member 5 by appropriately adjusting the position where the holding member mounting portion 92 is bolted. From the end portion of the portion 92, it projects toward the center of the cylindrical wall body 2.

  As shown in FIG. 6, the joining structure 1 has a height in which the holding member 5 can be inserted between the upper first flange plate 31 and the lower first flange plate 31 in the first connecting member 3 in the shaft 100. The cylindrical wall 2 is lowered using the jack 8.

  The joining structure 1 inserts the holding member 5 between the pair of first flange plates 31 as shown in FIG. At this time, the joining structure 1 is in a state in which the weight of the cylindrical wall body 2 is loaded on the jack 8 via the shaft member 42. In other words, the joining structure 1 is in a state in which the cylindrical wall body 2 is suspended from the jack 8.

  FIG. 7B is a view showing a state in which the shaft 81 of the jack 8 is lowered to bring the cylindrical wall body 2 into contact with the holding member 5. In such a state, the joining structure 1 starts to be transmitted to the holding member 5 from a state in which the weight of the cylindrical wall body 2 is loaded on the jack 8.

  FIG. 7C shows a state where the jack 8 is lowered from the state of FIG. 7B and stopped. At this time, in the joining structure 1, the upper first flange plate 31 in the first connecting member 3 is in contact with the holding member 5, and the cylindrical wall body 2 is held at a predetermined height. Yes.

  In the joining structure 1, when the shaft 81 of the jack 8 is lowered, the connecting portion hole 41 a is formed as a long hole extending in the vertical direction, so that the shaft member 42 extends from the upper side to the lower side of the connecting portion hole 41 a. It will be movable towards.

  As a result, the joining structure 1 can prevent the force applied when the shaft 81 of the jack 8 is moved downward from being applied to the holding member 5, and only the own weight of the cylindrical wall body 2 can be prevented. It is possible to transmit to the holding member 5 from a state in which the jack 8 is loaded. As a result, the joining structure 1 can prevent the holding member 5 from being damaged by the jack 8.

  In addition, if it is original, when it will be in the state of FIG.7 (b), ie, when the upper side 1st flange board 31 contacts the holding member 5, operation of the jack 8 will be stopped and it will be cylindrical. It is desirable to disconnect the first connecting member 3 and the second connecting member 4 after the wall 2 is held by the holding member 5. However, it is practically difficult to stop the jack 8 at the moment when the state of FIG.

  Therefore, normally, the shaft 81 of the jack 8 is performed in a series of movements from the state shown in FIG. 7A to the state shown in FIG. 7C. In this way, the joining structure 1 is configured such that the second connecting member 4 and the first connecting member 3 are connected to the first connecting member 3 so as to be extendable in the vertical direction. By being connected in a state where so-called play is provided, it becomes possible to prevent a load exceeding the weight of the cylindrical wall body 2 from acting on the holding member 5 that holds the cylindrical wall body 2.

  In addition, this invention is not restricted to embodiment mentioned above, It can take a various aspect.

  FIG. 8 is a view showing a modification of the earth retaining member joining structure 1 to which the present invention is applied. The functions of each member are almost the same, and only the specific configuration of each member is different. Therefore, the differences will be mainly described, the same components will be denoted by the same reference numerals, and the functions of the members having the same names will be described. Is omitted.

  The joining structure 1 is provided in the shaft 100 and includes a first connecting member 30 that connects the liner plates 20 in the vertical direction, and a plurality of liner plates 20 are connected and formed in a cylindrical shape. The cylindrical wall body 2, the 2nd connection member 4 which connects the cylindrical wall body 2 and the shaft 81 of the jack 8, and the holding member 51 which hold | maintains the cylindrical wall body 2 to predetermined | prescribed height are provided.

  Fig.9 (a) is a perspective view which shows the 1st connection member 30 in the joining structure 1 of the earth retaining member which concerns on the modification of this invention, (b) is the sectional drawing.

  The first connecting member 30 has a first flange plate 31 made of a plate material that is formed in a fan shape in a plan view, the in-plane direction extending in the horizontal direction, and the inner peripheral side of the first flange plate 31. It has the 1st web board 32 provided in an edge part, and the 1st rib board 33 provided in the 1st web board 32 while being extended from the 1st flange board 31 to an up-down direction. The first connecting member 30 is formed by bending an angle steel in which a first flange plate 31 and a first web plate 32 are formed in an L-shaped cross section, and opens toward the outer peripheral side of the first flange plate 31. Has been.

  The 1st web board 32 consists of board | plate materials, and is formed in circular arc shape by planar view. The first web plate 32 has an end portion on the inner peripheral side of the first flange plate 31 integrally formed at the lower end thereof. The first web plate 32 is formed with a first web connection hole 32a formed of a circular hole.

  The first rib plate 33 is formed with a first rib connecting hole 33a formed of a circular hole. The first rib plate 33 is disposed substantially perpendicular to the first flange plate 31 and the first web plate 32, and is fixed to the first flange plate 31 and the first web plate 32 by welding.

  FIG. 10: is a figure which shows the state which connected the cylindrical wall bodies 2 in the joining structure 1 of the earth retaining member which concerns on 2nd Embodiment of this invention.

  In the lower cylindrical wall body 2 a, the first connecting member 30 is bolted to the upper end of the liner plate 20 via bolts 61 and nuts 62.

  In the upper cylindrical wall 2 b, the first connecting member 30 ′ is bolted to the lower end of the liner plate 20 via bolts 61 and nuts 62. The first connecting member 30 ′ is obtained by omitting the configuration of the first rib plate 33 from the first connecting member 30, and the first web plate 32 in the first connecting member 30 ′ has a first web. The nut 62 is welded and fixed in advance so that the connection hole 32a and the hole of the nut 62 communicate with each other. The first web plate 32 in the first connection member 30 ′ is disposed on the inner side of the first web plate 32 in the first connection member 30 of the cylindrical wall body 2 a.

  The cylindrical walls 2a and 2b are inserted through the shafts of the bolts 61 through the two first web connection holes 32a and the nuts 62 that are welded and fixed to the first web plate 32 in the first connection member 30 ′ in advance. Thus, the nut 62 is screwed onto the tip of the shaft of the bolt 63 to be connected.

  As described above, the cylindrical wall bodies 2a and 2b are connected to each other by connecting the first connecting members 30 and 30 ′ combined in a U-shaped cross section so that the outer peripheral side is opened. It will be connected from the side. Since the connection between the cylindrical wall bodies 2a and 2b is an outer fastening, it is possible to safely connect the cylindrical wall body 2 in the vertical direction without an operator entering the inside of the cylindrical wall body 2. Become.

  FIG. 11A is a view showing a state in which the cylindrical wall body 2 is held by the jack 8 in the modified example of the earthing member joining structure 1 according to the present invention.

  Here, the 2nd connection member 4 is connected with the 1st connection member 30 arrange | positioned at the uppermost part of the cylindrical wall body 2 so that it can expand-contract vertically. The second connecting member 4 includes a connecting portion 41 connected to the first connecting member 30 and a shaft receiving portion 43 connected to the connecting portion 41 via a shaft member 42 having a horizontal direction as a rotation axis.

  The connecting portion 41 is made of metal, and is formed with a connecting portion hole 41 a ′ including a circular hole through which the shaft member 42 is inserted.

  The connecting portion 41 is provided on the lower surface of the face plate 44 and a face plate 44 in which the in-plane direction is extended in the horizontal direction, out of the two plate materials to which the angle steel is attached at the lower end by welding. And a connecting piece 45.

  The face plate 44 is disposed to face the upper first flange plate 31. The face plate 44 has a face plate hole 44a formed in a circular shape.

  The connecting piece 45 is made of angle steel having an L-shaped cross section, and is open toward the inner side of the cylindrical wall body 2. The connecting piece 45 extends in a vertical direction from the second flange plate 46 made of a plate material whose in-plane direction extends in the horizontal direction, a second web plate 47 provided on the second flange plate 46, and the second flange plate 46. And a second rib plate 48 provided on the second web plate 47.

  The second flange plate 46 is disposed so as to face the first flange plate 31 and is formed in a fan shape in plan view. The second flange plate 46 is formed with a second flange connection hole 46a formed of a circular hole. The second flange plate 46 is connected to the face plate 44 by aligning the second flange connecting hole 46a and the face plate hole 44a, inserting the shaft of the bolt 61, and screwing the nut 62 therethrough.

  The 2nd web board 47 is arrange | positioned so that the 1st web board 32 may be opposed, and is formed in circular arc shape by planar view. The second web plate 47 is integrally formed at the upper end with the outer peripheral end of the second flange plate 46.

  The second rib plate 48 is formed with a second rib connection hole 48a composed of a long hole extending in the vertical direction. The second rib plate 48 is disposed so as to be substantially perpendicular to the second flange plate 46 and the second web plate 47, and is welded and fixed to the second flange plate 46 and the second web plate 47. . The second rib plate 48 is in contact with the first rib plate 33 in the first connecting member 30.

  The second rib plate 48 is connected to the first rib plate 33 by aligning the second rib connecting hole 48a and the first rib connecting hole 33a and fastening a fastening member 39 made of a bolt, a nut or the like. Yes. That is, the second rib plate 48 is connected to the first rib plate 33 so as to be extendable in the vertical direction.

  In addition, although the 2nd rib connection hole 48a which concerns on 2nd Embodiment of this invention shall consist of a long hole extended in the up-down direction, the 2nd rib connection hole which concerns on this invention is a circular hole, for example In addition, the first rib connecting hole may have a long hole shape extending in the vertical direction.

  The shaft receiving portion 43 is formed with a circular receiving portion hole 43a through which the shaft member 42 is inserted.

  The holding member 51 is configured by a wire sling, and is attached to the first web connection hole 32 a in the first connection member 30 via the shackle 52. The holding member 51 is suspended from a crane or the like (not shown).

  As shown in FIG. 11A, the joining structure 1 is such that the weight of the cylindrical wall body 2 is loaded on the jack 8. In other words, the joining structure 1 is in a state in which the weight of the cylindrical wall body 2 is suspended from the jack 8 via the fastening member 39. At this time, the joining structure 1 is in a state where the holding member 51 is bent, and the load of the cylindrical wall body 2 is not applied to the holding member 51.

  FIG. 11B is a diagram showing a state in which the cylindrical wall body 2 is lowered by the jack 8. In the joining structure 1, the shaft 81 of the jack 8 is lowered, and a tensile force starts to act on the holding member 51 made of a wire sling attached to the first connecting member 30. In such a state, the joining structure 1 starts to be transmitted to the holding member 51 from a state in which the weight of the cylindrical wall body 2 is loaded on the jack 8.

  FIG. 11C shows a state in which the descent of the cylindrical wall body 2 by the jack 8 is stopped. At this time, the joining structure 1 is in a state in which the cylindrical wall body 2 is held at a predetermined height by the holding member 51.

  In the joining structure 1, when the shaft 81 of the jack 8 is moved downward, the second rib connecting hole 48a is formed as a long hole extending in the vertical direction, so that the second rib plate 48 is moved downward from above. It will be movable towards.

  Thereby, the joining structure 1 can prevent the force acting when the shaft 81 of the jack 8 is moved downward from being applied to the holding member 51, and only the own weight of the cylindrical wall body 2 can be prevented. It is possible to transmit to the holding member 51 from a state in which the jack 8 is loaded. As a result, the joining structure 1 can prevent the holding member 51 from being damaged by the jack 8.

  FIG. 12 is a view showing another modification of the earthing member joining structure 1 to which the present invention is applied. The functions of each member are almost the same, and only the specific configuration of each member is different. Therefore, the differences will be mainly described, the same components will be denoted by the same reference numerals, and the functions of the members having the same names will be described. Is omitted.

  The joining structure 1 is provided in the shaft 100 and includes the first connecting member 3 that connects the liner plates 20 in the vertical direction, and a plurality of liner plates 20 are connected and formed in a cylindrical shape. The cylindrical wall body 2, the 2nd connection member 4 which connects the cylindrical wall body 2 and the shaft 81 of the jack 8, and the holding member 53 which hold | maintains the cylindrical wall body 2 to predetermined | prescribed height are provided.

  Fig.13 (a) is a perspective view which shows the other modification of the 1st connection member 3 of FIG. 12, (b) is the sectional drawing.

  The first flange plate 31 has a notch 38 that is notched outward.

  FIG. 14A is a view showing a state in which the cylindrical wall body 2 is held by the jack 8 in another modification of the earthing member joining structure 1 to which the present invention is applied.

  Here, the 2nd connection member 4 is connected with the 1st connection member 3 arrange | positioned at the uppermost part of the cylindrical wall body 2 so that it can expand-contract vertically. The 2nd connection member 4 has the connection part 41 connected with the 1st connection member 3, and the shaft receiving part 43 connected with the connection part 41 via the shaft member 42 which made the horizontal direction the rotating shaft.

  The connecting portion 41 has a face plate 44 to which an in-plane direction is extended in the horizontal direction among the two plate materials to which the angle steel is attached by welding to the lower end thereof to form the angle steel.

  The face plate 44 is provided so as to face the upper first flange plate 31 so as to be separated from the upper first flange plate 31. The face plate 44 has a face plate hole 44a formed in a circular shape.

  The second connecting member 4 has a lower diameter-expanded portion 71 formed by expanding the diameter below the upper first flange plate 31 and an upper diameter-expanded portion 72 formed by expanding the diameter above the face plate 44. The metal penetrating member 7 having the above is penetrated through the notch 38 in the first flange plate 31 and the face plate hole 44a in the face plate 44, and is connected to the first flange plate 31.

  The holding member 53 is formed of a chain block and is attached to the first web connection hole 31 a in the first connection member 3. The holding member 53 is fixed to the gantry 90 as shown in FIG.

  In the joint structure 1, as shown in FIG. 14A, the weight of the cylindrical wall body 2 is loaded on the jack 8. In other words, the joining structure 1 is in a state in which the weight of the cylindrical wall body 2 is suspended from the jack 8 via the penetrating member 7. At this time, the joining structure 1 is in a bent state without the weight of the cylindrical wall body 2 acting on the holding member 53.

  FIG. 14B is a diagram illustrating a state where the jack 8 is lowered and stopped. In the joining structure 1, the shaft 81 of the jack 8 is lowered, and a tensile force acts on the holding member 53 made of a chain block attached to the first connecting member 3, so that the cylindrical wall body 2 is predetermined by the holding member 53. It is the state held at the height of.

  As described above, in the joining structure 1, when the shaft 81 of the jack 8 is moved downward and the cylindrical wall body 2 is held at a predetermined height by the holding member 53, the penetrating member 7 is extended in the vertical direction. By being formed, it is movable from the upper side to the lower side.

  As a result, the joining structure 1 can prevent the force acting when the shaft 81 of the jack 8 is moved downward from being applied to the holding member 53, and only the own weight of the cylindrical wall body 2 can be prevented. It is possible to transmit to the holding member 53 from a state in which the jack 8 is loaded. As a result, the joining structure 1 can prevent the holding member 53 from being damaged by the jack 8.

  FIG. 14C shows a state where the second connecting member is rotated. The joining structure 1 has a shaft receiving portion 43 connected to a connecting portion 41 via a shaft member 42 having a horizontal direction as a rotation axis, thereby allowing the penetrating member 7 penetrated through the notched portion 38 to be indicated by an arrow R in the figure. It can be rotated in the direction. As a result, the joining structure 1 can easily release the connection between the first connecting member 3 and the second connecting member 4 while holding the cylindrical wall body 2 on the holding member 53. .

  FIG. 15A shows another modification of the earthing member joining structure 1 according to the present invention, in particular, a modification of the penetrating member 7, and shows a state in which the cylindrical wall body 2 is held by the jack 8. (B) shows a state where the jack is lowered and stopped.

  The penetrating member 7 may be one in which the lower diameter enlarged portion 71 is used as the two nuts 71 and the upper diameter enlarged portion 72 is used as the head of the bolt 72. In such a case, the first connecting member 3 and the second connecting member are held while the cylindrical wall body 2 is held by the holding member 53 by removing the two nuts 71 screwed to the tip of the bolt 72. The connection with 4 can be easily released. Note that the penetrating member according to the present invention may be one in which the lower enlarged portion is used as a bolt head and the upper enlarged portion is used as a nut.

[Liner plate installation method]
Next, a method for installing the earth retaining member according to the embodiment of the present invention will be described. Since the liner plate joining structure 1 described above is constructed by the liner plate installation method according to the present embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.

(Drilling process)
In the earth retaining member installation method according to the present embodiment, first, an excavation process for excavating the bottom of the shaft 100 is performed. The excavation of the vertical shaft 100 is performed by excavating the ground by a depth about the height of one cylindrical wall body 2 using an excavating machine such as a clam shell. Further, the foundation hole 101 is excavated inside the shaft 100 and the gantry 90 is erected.

(Installation process)
Next, in the installation method of the earth retaining member according to the present embodiment, an installation process of installing the cylindrical wall body 2 in the shaft 100 is performed. Installation of the cylindrical wall body 2 is performed by installing the cylindrical wall body 2 formed in a cylindrical shape by an operator in advance outside the vertical shaft 100 in the vertical shaft 100 using a crane or the like. In addition, the installation of the cylindrical wall body in the installation method of the earth retaining member according to the present invention is performed by installing a liner plate combined in a semicircular shape in a plan view outside the shaft using a crane or the like. Then, the liner plates combined in a semicircular shape in plan view may be connected to each other in the shaft to form a cylindrical wall body.

  Further, at this time, the holding member 5 is inserted between the pair of first flange plates 31 in the first connecting member 30 disposed at the uppermost end of the cylindrical wall body 2 so that the cylindrical wall body 2 has a predetermined height. Hold on. And another cylindrical wall body 2 is installed above the cylindrical wall body 2 held by the holding member 5 using a crane or the like. In this case, for example, as shown in FIG. 5, the bolt 61 is inserted into the first flange connection holes 31 a of the two first connection members 3, and the nut 62 is screwed, whereby the cylindrical wall body 2. Connect them together. Thereby, since the connection between the cylindrical wall bodies 2 is an outer fastening, it is possible to safely connect the cylindrical wall bodies 2 in the vertical direction without an operator entering the inside of the cylindrical wall body 2. It becomes.

(Descent process)
Next, in the installation method of the earth retaining member according to the present embodiment, a descent process of lowering the cylindrical wall body 2 to the shaft 100 using the jack 8 is performed. In this step, the second connecting member 4 is connected to the first connecting member 3 disposed at the uppermost portion of the cylindrical wall body 2 so as to be extendable in the vertical direction, and the jack wall 8 is used to connect the cylindrical wall body 2. Descent into the shaft 100.

  In addition, according to the condition of the ground where the vertical shaft 100 is provided, when the cylindrical wall body 2 is lowered to the vertical shaft 100 so as to press-fit the cylindrical wall body 2 with the jack 8, or the tubular wall body 2 is suspended by the jack 8. There is a case of descending to the shaft 100. In any case, the holding member 5 is inserted between the pair of first flange plates 31 in the first connecting member 3 arranged at a predetermined height, that is, the uppermost portion of the cylindrical wall body 2. Use jack 8 to descend to the highest possible height.

  And the holding member 5 is inserted between a pair of 1st flange plates 31 in the 1st connection member arrange | positioned at the uppermost end of the cylindrical wall body 2. FIG. At this time, as shown in FIG. 7A described above, the cylindrical wall body 2 is suspended from the jack 8.

  After that, as shown in FIGS. 7B and 7C described above, the jack 8 is further lowered to bring the upper first flange plate 31 into contact with the holding member 5, so that the cylindrical wall 2 Is held at a predetermined height by the holding member 5. At this time, the connecting portion hole 41a in the second connecting member is formed as a long hole extending in the vertical direction, so that the shaft member 42 can move from the upper side to the lower side of the connecting portion hole 41a.

  Thus, in the installation method of the earth retaining member according to the present embodiment, it is possible to prevent the force acting when the shaft 81 of the jack 8 is moved downward from being applied to the holding member 5. . Only the own weight of the cylindrical wall body 2 can be transmitted to the holding member 5 from the state where the jack 8 is loaded.

  Thereafter, the installation of the liner plate is completed by repeatedly performing the excavation process, the installation process, and the descent process described above.

  In addition, in the installation method of the earth retaining member according to the present embodiment, after excavating the ground by a depth corresponding to the height of one cylindrical wall body 2 using an excavating machine such as a clam shell, the cylindrical shape Although the method of lowering the wall body 2 by an amount corresponding to its height has been exemplified, the installation method of the earth retaining member according to the present invention uses a jack, so that the cylindrical wall body can be press-fitted into the ground. is there. For this reason, when the ground where the shaft is provided is soft, etc., after the cylindrical wall body is pressed downward from the shaft bottom of the shaft and lowered, the excavation machine such as a clam shell is used to Bottom excavation may be performed.

  As described above, the bonding structure and the installation method of the earth retaining member according to the embodiment of the present invention have been described in detail. However, each of the above-described or illustrated embodiments shows an embodiment embodied in carrying out the present invention. These are merely examples, and the technical scope of the present invention should not be construed in a limited manner.

DESCRIPTION OF SYMBOLS 1: Joining structure 2: Cylindrical wall 2a: Cylindrical wall 2b: Cylindrical wall 3: 1st connection member 4: 2nd connection member 5: Holding member 7: Penetrating member 8: Jack 20: Liner plate 30 : 1st connecting member 30 ': 1st connecting member 31: 1st flange board 31a: 1st flange connecting hole 32: 1st web board 32a: 1st web connecting hole 33: 1st rib board 33a: 1st rib connection Hole 38: Notch 39: Fastening member 41: Connecting portion 41a: Connecting portion hole 41a ': Connecting portion hole 43: Shaft receiving portion 43a: Receiving portion hole 44: Face plate 44a: Face plate hole 45: Connecting piece 46: Second flange Plate 46a: Second flange connecting hole 47: Second web plate 48: Second rib plate 48a: Second rib connecting hole 51: Holding member 52: Shackle 53: Holding member 61: Bolt 62: Nut 71: Lower diameter expansion Part 72: Side expanded diameter section 81: shaft 90: pedestal 91: a jack mounting portion 92: holding member mounting portion 99: scaffold 100: Shaft 101: Basic hole 102: Basic block 103: earth retaining wall

Claims (8)

It is a connection structure of earth retaining members provided in a shaft,
A cylindrical wall body that has a first connecting member that connects the earth retaining members in the vertical direction, and is formed into a cylindrical shape by connecting a plurality of earth retaining members;
A second connecting member for connecting the cylindrical wall body and the shaft of the jack;
Holding means for holding the cylindrical wall body at a predetermined height,
The second connecting member is connected to the first connecting member disposed at the uppermost part of the cylindrical wall body so as to be extendable in the vertical direction. The second connecting member has a connecting portion connected to the first connecting member, and a shaft receiving portion connected to the connecting portion so as to be vertically extendable and connected to the shaft of the jack. The structure for connecting earth retaining members according to claim 1. The first connecting member has a pair of first flange plates provided at intervals in the vertical direction, and a first web plate for connecting the pair of first flange plates to each other,
The second connecting member is provided with a face plate provided at a lower end of the second connecting member so as to be spaced apart from the upper first flange plate, and a lower diameter-expanded portion formed by expanding the lower portion from the upper first flange plate. A penetrating member having a portion and an upper diameter-enlarged portion formed by enlarging the upper side of the face plate through the first flange plate and the face plate and coupled to the first connecting member. The structure for connecting earth retaining members according to claim 1. The second connecting member is configured to be rotatable around a horizontal direction as a rotation axis.
The connection structure of the earth retaining member according to claim 3, wherein the upper first flange plate has a notch formed by notching. The structure for connecting earth retaining members according to claim 3 or 4, wherein the penetrating member comprises a bolt and a nut. The first connecting member has a first rib plate extending in the vertical direction,
The second connecting member has a second rib plate extending in the vertical direction,
The connection structure of the earth retaining member according to claim 1, wherein the second rib plate is connected to the first rib plate so as to be extendable in the vertical direction. An installation method for a retaining member that installs a retaining member in a vertical shaft,
An installation method for a retaining member, wherein the retaining member to which the joining structure of the retaining members according to claim 1 is applied is lowered by a jack. The method for installing a retaining member according to claim 7, wherein the retaining member is excavated after the retaining member is lowered to the bottom of the shaft by a jack.

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