JP5268732B2 - Wall member for underground continuous wall, underground continuous wall construction method, and underground continuous wall - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently perform an upper part recovery operation for an H-steel positioned on the underground upper side by an easy and simple operation. <P>SOLUTION: This wall member 1 for a continuous underground wall includes a connection fitting 6 which is disposed between the upper and lower ends at which a lower stage H-steel 3 and an upper stage H-steel 4 are made to abut on each other and a joint which is connected through a mounting bar operated from the mounting holes 10 formed in one flanges of the H-steels toward the mounting holes 10 formed in the other flanges and which is provided along the ends of the flanges of the H-steels. The H-steels disposed adjacent to each other are connected to each other through the joint. The connection fitting 6 includes an insertion part 6a which is made of a steel of such a size that can be disposed in a recess 3c or 4c which is divided by both flanges and web of the H-steel and disposed in the recess at one end in the state of being fixed to the recess at the other end among the upper and lower ends and an insertion hole 8 which is provided to the insertion part and allows the mounting bar to extend therethrough and which matches the mounting hole 10 formed in both flanges which partition the recess at the other end. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a lower H-section steel (this lower section includes a structure composed of a plurality of H-section steels. The main points are the steel parts excluding the upper H-section steel to be separated. The same applies hereinafter). The upper H-section steel members are connected in a separable manner and the adjacent members are connected to each other through a joint, and the subsequent wall member is connected to the preceding wall member through the joint. The present invention relates to an underground continuous wall construction method and an underground continuous wall made by the construction method.

  As illustrated in Patent Documents 1 and 2, the target underground continuous wall construction method forms a solid body such as soil cement along with the ground excavation along the wall construction portion, and before the solidified body is solidified, On the other hand, the erection operation is performed while connecting the subsequent wall members through the joints. Here, the wall member used is referred to as “NS-BOX”. In this wall member, a plurality of H-section steels are integrated into a design length. At the same time, it has a male or female joint provided along the flange end of each H-section steel, and the adjacent H-sections are connected in the horizontal direction via the joint. For this reason, the built underground continuous wall has a double joint structure because each wall member is built in a state in which both sides of the H-shaped opposing flanges are fitted via each other's joints, and the solidified body. Excellent durability and water stoppage can be obtained because of the built-in relationship.

Figure 9 (a), (b) is as well as digging between the reclamation underground continuous wall 90 the mechanic with a predetermined distance at least of the underground continuous wall building method, between the adjacent diaphragm wall 90 An example in which an underground structure 60 is constructed is shown. As shown in FIG. 3 and FIG. 4, which is an example of the present invention, this construction procedure is performed by constructing the underground continuous walls on both sides and then cutting between the underground continuous walls to a predetermined depth, The underground structure 60 is constructed using the underground continuous wall as a temporary and combined body wall. Thereafter, the upper part of the underground structure 60 is backfilled with earth and sand 65. As shown in FIG. 9, the wall members 91 arranged adjacent to each other are connected to each other through mutual joints (a male joint of one wall member and a female joint of the other wall member). It is used as a temporary combined body wall. The underground structure 60 is an underground road, an underground station building, a stand-up or the like. Reference numeral 92 denotes a solidified solidified body.

  In addition, patent document 3 and 4 are mentioned by the relationship with the wall member and upper part collection | recovery process of this invention. These include, as wall members, a structure in which the upper H-section steel is detachably connected to the lower H-section steel, and a structure in which a plurality of wall members are built on a solidified body such as soil cement with a space therebetween, The structure which pulls out the H-section steel of the upper stage which comprises each wall member is disclosed.

  First, in Patent Document 3, the structure of this wall member is, for example, an outer shell member that surrounds the outer periphery of the butted portion in a state where the upper and lower H-section steels (core materials) are butted together, It consists of a joining means (temporary bolt) that joins the H-shaped steel and a fracture bolt that joins the outer frame member and the other H-shaped steel, and a force equal to or greater than a predetermined tensile force was applied to one of the H-shaped steels. Sometimes the broken bolt breaks and separates the upper H-section steel. And as an underground wall construction method, the said wall member is cast in a solidified body, and the placement of a wall member is interrupted before temporary bolts are buried in the ground. The temporary bolt is removed from the outer shell member, and the wall member is again driven and buried to a predetermined position. After the use as a wall member is finished, a tensile force is applied to the H-shaped steel above the butt portion to break the broken bolt and pull out only the upper H-shaped steel.

  In Patent Document 4, the structure of this wall member is a state in which upper and lower H-section steels are in contact with each other, and a joining plate is disposed over the upper and lower outer ground surfaces and the upper and lower outer surfaces of the cut-off portion side flange. The lower flange and the joining plate are screwed together with bolts and nuts to integrate the upper and lower H-section steels together. As an underground wall construction method, the upper and lower H-shaped steels are integrated with each other via a joining plate and bolts, and the solidified body (standing column continuous wall) formed in the ground is used as a core pile material in the ground. To cast. After excavating the excavated part side after placing, the bolt with the head on the cut part side flange is unscrewed from the nut provided on the ground side flange via the joining plate, and the bolt is extracted to the cut part side. The upper and lower H section steels are separated from each other, and the upper H section steel is pulled out to the ground. Then, the excavated part is backfilled with earth and sand.

Japanese Patent Application Laid-Open No. 2001-287738 JP 2003-55960 A JP 2004-238998 A Japanese Patent No. 3404315

  In the underground continuous wall constructed as shown in FIG. 9 above, the earth pressure is gradually reduced between the top plate 64 of the underground structure 60 and the ground surface GL. If it is buried, it may be an obstacle. In particular, in the case of underground structures that have long construction sections such as tunnels and joint grooves and are constructed at large depths, a considerable amount of steel is wasted depending on the construction section, and from the viewpoint of effective use of resources. Is not a good idea.

  As measures against this, the applicants previously developed and filed an optimum wall-friendly wall member and underground continuous wall construction method according to the ground conditions such as the original ground and the improved ground. (Japanese Patent Application No. 2008-204907). The wall member has a substantially H-shaped cross section in a direction intersecting the longitudinal direction, a main body having a male or female joint at the end of the H-shaped flange, and a cross-section bonded to the upper end of the main body. Is smaller than the main body and comprises an upper H-section steel having an attachment portion for attaching and detaching a jig forming a joint for guide arranged on a corresponding joint extension line of the main body. This main part has a configuration in which at least the upper part of the wall member is made relatively small, and in this case as well, the adjacent members can be connected to each other via a joint. For this reason, in the prior application, the total amount of steel material used as the underground continuous wall can be reduced, but the upper H-section steel remains buried and still unsatisfactory as an obstacle countermeasure and effective utilization of materials. Therefore, as a further countermeasure, as described in Patent Documents 3 to 4, it is conceivable to connect the upper H-section steel of the wall member in a separable manner and separate and collect them later.

  However, in the construction work, after the main construction is completed and backfilling is completed, the ground is compacted and the ground needs to be cured for at least several months to a year. Since steel is also expected to have support, recovery or removal work cannot be undertaken during the curing period. From such a situation, in the upper recovery structure of Patent Document 4, since the upper and lower H-section steels are butted together, the joining plates are simply arranged across the upper and lower outer surfaces of each other, When the bolt for connection through the joining plate is removed, there is a problem that the upper side becomes unconstrained with respect to the lower side and is easily displaced. Moreover, in the upper collection structure of patent document 3, since the outer frame member surrounds the outer periphery of the abutting portion in a state where the upper and lower H-shaped steels are abutted with each other, each wall member is a mutual underground wall construction method. It cannot be adopted for a structure connected through a joint. Moreover, in the conventional structure, when the wall member becomes longer, you may want to connect it to the upper end of the lower H-section steel while it is being built in the state where the upper H-section steel is lifted. The H-shaped steel is easy to move, and it is difficult to position the upper mounting hole with respect to the lower H-shaped steel mounting hole. In addition, since these recovery works have been time-consuming since the completion of the work in terms of time and may be unprofitable economically, it took time only to recover the H-section steel. Major work such as re-digging and backfilling is not realistic.

  The present invention solves the above problems. The purpose is, for example, after filling back the excavation part on the top plate of the underground structure and after passing through a predetermined curing period, without damaging the erection work or structure construction work, An object of the present invention is to provide a wall member for an underground continuous wall, an underground continuous wall construction method, and a continuous underground wall that can efficiently perform an upper recovery operation of the H-shaped steel located on the upper side of the ground.

  According to the first aspect of the present invention, there is provided a connecting fitting disposed over the upper and lower ends of the lower H-section steel and the upper H-section steel, and an attachment flange provided on one flange of the H-section steel to the other flange. And a male or female joint provided along the end of the flange of each H-shaped steel. In addition, a wall member for an underground continuous wall in which adjacent H-shaped steels are connected to each other via the joint, and the connection fitting is formed in a recess defined by both flanges of the H-shaped steel and a web. It is made of a steel material of a size to be arranged, and is provided in the insertion portion, the insertion portion being arranged in the concave portion in the other end portion in a state of being fixed to the concave portion in the one end portion among the upper and lower end portions. To match the mounting holes of both flanges defining the concave portion of the other end. It is characterized in that it has a through hole through which the mounting bars.

  The above wall member is assumed to be called “NS-BOX”, but if it has a male or female joint provided along the end of the H-shaped flange, “NS It may be similar to “-BOX”. In addition, as shown in FIG. 1B, the joints on both sides of the flange are not limited to the type of the same shape (female joint or male joint), but different shapes (one is a female joint and the other is a male joint). (Fitting) type is also acceptable. In the former configuration, the wall member having the male joint and the wall member having the female joint are erected alternately. In the latter configuration, for example, the succeeding wall member is built while fitting the female joint to the male joint of the preceding wall member. In addition to the commercially available bolts, the “mounting rods such as bolts” include, for example, steel mounting or connecting shafts or pin members between the members (the mounting holes of both flanges and the insertion holes of the insertion portions). It is used in a sense that includes a configuration in which it is arranged in a skewered shape and is provided with a retaining process.

  According to a second aspect of the present invention, in the first aspect of the present invention, in the first aspect, each of the connecting metal fittings is used as a set, and each of the concave portions defined by both flanges and webs of the H-shaped steel constituting the one end portion. Is it fixed by welding to each of the recesses, or each connection fitting is fixed through a common bolt using an insertion hole provided in the web and passing through the recesses? It is one of these.

  According to a third aspect of the present invention, in the first or second aspect, the insertion portion of the connection fitting is formed in a size that fits in the concave portion and is disposed between the flanges of the concave portion with almost no gap. It is characterized by having.

  According to the invention of claim 4, when the wall member is built in a solidified body such as soil cement which solidifies with time, the continuous wall construction in which the subsequent wall member is connected to the preceding wall member via the joints. In the method, the wall member according to any one of claims 1 to 3 is used as the wall member, and each wall member is arranged such that the head of the mounting bar is on the cut-off portion side opposite to the natural ground side. A build-in process in which the solid continuous wall is built in order while being connected to each other through the joints in the solidified body, and the cut-out side of the underground continuous wall is one of the solidified solid bodies. After removing the mounting bar in the process of reconstructing the excavation part on the underground structure and the structure building process for constructing an underground structure in the excavation part by excavating with the part, and completing the backfilling, An upper recovery step of pulling out the upper H-section steel constituting each of the wall members; It is characterized in that to go through.

According to a fifth aspect of the present invention, in the upper recovery step according to the fourth aspect of the present invention, in the upper recovery step, the upper H-section steel is penetrated from the ground surface to the vicinity of the connection fitting using a penetrating rod means having a rotating boring rod. The solidified material adhering to the surface is scraped off, and / or fluidized soil is injected and filled into the gap formed when the upper H-shaped steel is pulled out. This fluidized soil has various strength promoters (for example, promoters that can be solidified in a few hours after filling the ground clearance) in the fluidized soil to effectively prevent the possibility of ground collapse due to the upper recovery process. Including the included configuration. On the other hand, the invention of claim 6 is the invention according to claim 4 or 5, wherein the upper recovery step is connected to a jack means having a main body and a plunger protruding and retracting in the main body, and an upper end of the upper H-section steel. The main body is held directly or via a support rod , and the plunger protrudes in a state where the plunger is applied to the upper inner wall side of the generally inverted U shape of the hanging metal. The upper H-section steel is moved upward.

  The invention according to claim 7 is the underground continuous wall constructed by any one of claims 4 to 6, and the adjacently arranged wall members are connected via the joint, and the lower H-section steel It has the said connection metal fitting protruding from the upper end, It is characterized by the above-mentioned.

  In invention of Claim 1, as a wall member for underground underground walls, it is the same as patent documents 3 and 4 by the point that H-section steel of an upper and lower stage can be isolate | separated by the extraction operation of a volt | bolt. In addition, the wall member of the present invention is smaller and easier to position with respect to the recessed portion than the Patent Documents 3 and 4, because the connection fitting is disposed in the recessed portion defined by both the H-shaped steel flange and the web. Excellent in properties. In addition, the wall member of the present invention is suitable for a structure in which adjacently arranged members are connected to each other via a joint compared to a structure in which the outer frame member and the connecting member are broken as in Patent Document 3. Compared to the structure in which the joining plates are arranged across the upper and lower outer surfaces of each flange of H-shaped steels as in Patent Document 4, the connecting operability and the pull-out property are inserted because the insertion part of the connection fitting is inserted into the mating recess. It is also excellent in that it maintains rigidity as an integral part proportional to the fitting force between the insertion portion and the recess even when the upper and lower H-section steels have pulled out the bolts.

  In the invention of claim 2, as inferred from FIG. 1, the two connecting fittings are fixed to the respective concave portions forming the lower or upper H-section steel, and the opposite H-section steel is , Positioning when the insertion part of each connection fitting is fitted in each recess of the H-shaped steel, and position when fitting the H-section steel web into the gap between the insertion parts of each connection fitting Due to the synergistic action with the projecting, the flange-side mounting hole of the H-shaped steel and the insertion-portion-side insertion hole of the connection fitting are positioned reliably and with high accuracy. In addition, the structure in which each connecting bracket is fixed to the corresponding recess by welding, or the structure in which each connecting bracket is fixed to the corresponding recess via a common bolt, as compared to the conventional fixing structure using a bolt. In the H-shaped steel, protrusions caused by bolt heads or the like can be eliminated on the outer surface of the flange, particularly the outer surface of the flange on the excavation side. For example, this specification is suitable for the case where the side wall of the underground structure is combined and integrated with the outer surface of the flange on the excavation side if the specification is to construct the underground structure in a later process.

  In the invention of claim 3, as inferred from FIG. 2, the upper and lower H-shaped steels are inserted into the recess at the other end with almost no gap in a state where the corresponding portion of the connection fitting is fixed to the recess at the one end. Due to the presence of the inserted part, even if the mounting bar that secures the inserted part and the other end is removed, the integrated part is proportional to the fitting force between the inserted part and the recessed part of the connection fitting. The rigidity of the can be reliably maintained.

  In the invention of claim 4, when building each wall member in the solidified body, as an underground continuous wall construction method for connecting the subsequent wall member to the preceding wall member via each other's joint, compared to the conventional configuration, The point which uses the wall member in any one of Claim 1 to 4 as a wall member, the point which builds up, connecting each wall member through a joint so that the head of a bolt may become the cut-off part side, underground After constructing the structure, the bolts are removed in the process of backfilling the excavated part on the underground structure, and after completing the backfill, the upper H-section steel of each wall member is pulled out.

  And, in the underground continuous wall construction method of the present invention, after completion of backfilling, that is, after curing as described in the problem, the H-section steel at the upper stage of each wall member can be sequentially extracted and diverted or recovered as a steel material by a simple operation. Excellent in resource saving and obstacle removal configuration. In addition, since the cross section of the lower H-section steel (including a structure composed of a plurality of H-section steels) and the upper H-section steel can be made the same, it is built as in the prior application (Japanese Patent Application No. 2008-204907, etc.). This can be carried out without using a jig tool.

  In the invention of claim 5, in the upper recovery step, the H-shaped steel is solidified by penetrating from the ground surface side to the vicinity of the connection fitting by the penetrating rod means and scraping off the solidified material adhering to the upper H-shaped steel. The power required for extraction can be reduced by cutting the edges. Further, the fluidized soil is injected and filled into the gap formed by the drawing of the upper H-section steel by the penetrating rod means, so that the problems associated with the drawing can be easily solved.

  In the sixth aspect of the invention, when the upper H-section steel is pulled out by the jack means in the upper recovery step, it is possible to easily and surely perform the edge cutting at the initial drawing stage. In the present invention, preferably, as shown in FIG. 8, the connection fitting is fixed to the concave portion of the lower H-shaped steel, and the upper end side of the insertion portion is used as a load receiving portion of the jack means.

  In the invention of claim 7, compared to the conventional underground continuous wall in which the wall members are connected to each other through the joints, the construction method of claims 4 to 6 is ideal for saving resources and not causing an obstacle. A continuous underground wall can be realized, and it can be expected to expand its application as this kind of underground continuous wall.

(A) is the exploded perspective view which decomposed | disassembled the wall member of this invention form, (b) is the plane cross section corresponding to the AA line of (a) supposing the state which connected the said wall members through mutual joints. FIG. (A) is the perspective view which expanded the said wall member, (b) is a sectional side view corresponding to the A1-A1 line of (a), (c) corresponds to the A2-A2 line of (b). It is a block diagram shown with a cross section. (A), (b) is sectional explanatory drawing which shows the creation completion state which built the wall member, and a cutting process. (A), (b) is sectional explanatory drawing which shows the completion state of a permanent underground structure, and a backfilling process. It is sectional explanatory drawing which shows the completed state of the built underground structure and the underground continuous wall of this invention. It is a schematic diagram including the partially expanded part which shows the suspension operation performed at an upper collection | recovery process. (A), (b) is a schematic diagram which shows the apparatus set and edge cutting state at the time of extraction. It is a schematic diagram which shows drawing | extracting and gap | interval or cavity filling work using the said apparatus. It is a figure for demonstrating a prior art example, (a) shows the state which built the underground structure between underground underground walls, (b) is the DD sectional view taken on the line of (a).

  Hereinafter, as an optimal form of the present invention, a wall member for the underground continuous wall shown in FIGS. 1 and 2, a method for constructing an underground continuous wall shown in FIGS. 2 to 8, an underground continuous wall, and a main body for erection thereof It demonstrates in order of the usage example as a wall.

(Wall member for underground continuous wall) FIGS. 1A and 1B show a wall member corresponding to claims 1 and 2 and a connection structure between the wall members. In FIG. 1A, the wall member 1 includes a bottom H-shaped steel 2 as a rooted portion and a bottom H that is joined and integrated with the upper end of the H-shaped steel 2 from the bottom to the top. It is composed of a section steel 3 and an upper H-section steel 4 that is connected to the upper end of the H-section steel 3 through a connection fitting 6, a bolt B and a mounting plate 7 in a separable manner. In addition, the volt | bolt B is a long volt | bolt with a head according to the space | interval of the flanges of H-section steel as an example of the bar for attachment of this invention, and multiple pieces are used.

  Here, the lower H-section steel 3 and the upper H-section steel 4 have the same cross-sectional shape as “NS-BOX”. In the H-shaped steel 3 and the H-shaped steel 4, the H-shaped web 3b and the web 4b having the same shape, the H-shaped flanges 3a and 3a having the same shape, and the flange flanges 4a and 4 are abutted at the upper and lower ends. And the H-section steel 3 and the H-section steel 4 are connected to the connection fitting 6 arranged over the upper and lower ends thereof, and one flange 4a of the H-section steel (in this embodiment, the flange 4a of the upper stage H-section steel 4). The bolts B are operated from the provided mounting holes 10 toward the mounting holes 10 provided in the other flange 4a, and are connected to the end portions of the flanges 3a and 4a of the H-shaped steels 3 and 4, respectively. The H-shaped steels having the female joint 5 or the male joint 5 ′ provided along the two sides and adjacently arranged as shown in FIG. 1B are connected to each other through the joints 5, 5 ′. The number of the H-section steel 3 in the lower stage is one in the drawing, but in practice, several H-section steels having the same shape are often joined and integrated. The upper H-section steel 4 has a plurality of hanging attachment holes 12 provided in the upper part of both side flanges 4a. The mounting hole 12 is a hole for connecting to a lifting jig as will be described later. The mounting holes 12 can be connected to the lower stage side even if the upper H-section steel 4 is upside down by setting the same number and the same positions as the mounting holes 10 for the bolts B. Can improve.

  On the other hand, the lowermost H-section steel 2 has a cross section smaller than that of the H-section steels 3 and 4, and is built in, for example, a water-impermeable layer in the deep underground, that is, a place where water stoppage in the ground is unnecessary. That is, the H-section steel 2 has a web 2b joined to the web 3b of the H-section steel 3 and the H-shaped flanges 3a and 3a, as compared with the section of the H-section steel 3 whose cross section intersects the longitudinal direction. It is a shape having short flanges 2a, 2a joined to a part. Of course, the lowermost H-section steel 2 may be omitted.

  The connecting fitting 6 has a length dimension that extends over the upper and lower ends of the upper and lower H-section steels 3 and 4, and both flanges 3 a and 3 a (4 a and 4 a) of the H-section steel 3 (or 4) and Each recess can be placed in a pair of recesses 3c, 3c (4c, 4c) partitioned by the web 3b (4b), and the upper and lower H-section steels can be well maintained. It is a steel material having a size between the opposing flanges and having the same width as that of the webs 3b and 4b. Moreover, the connection metal fitting 6 is the protrusion arrange | positioned in the recessed part 4c or 3c of the other end part in the state fixed to the recessed part 3c or 4c of one end part among the upper-lower-end parts of the H-section steel 3 and 4 of an upper-lower stage. It has the insertion part 6a which is a part, and the insertion hole 8 which is provided in the insertion part 6a and corresponds to the mounting hole 10 of both flanges defining the recess at the other end.

  More specifically, the connection fitting 6 is not limited to a steel material having a substantially U-shaped cross section as shown in FIG. 1, for example, a box shape with each side closed like a lunch box, or a part of a face like a lunch box with a lid open. A box-type or thick-plate-type steel material with an opening may be used. Further, in the connection fitting 6, the insertion portion 6a and the other fixing portion may be the same shape or different shape, but at least the insertion portion 6a fits inside the concave portion 4c or the concave portion 3c and between both flanges of the respective concave portions. It is preferable that the size is set so that there is almost no gap. On the other hand, the insertion hole 8 is provided on both inner sides if the insertion portion 6a is a U-shaped cross section or a box shape, but if it is a thick plate type, it is provided as a lateral hole in the width direction. Further, as illustrated in FIG. 2B, the connection fitting 6 is fixed to the recess 3 c at the upper end of the lower H-section steel 3 or the recess 4 c at the lower end of the upper H-section steel 4 by welding. . As a fixing structure other than this welding, as illustrated in the modification of FIG. 2C, the web 3b at the upper end of the lower H-section steel 3 (intermediate wall between the recess 3c and the recess 3c), or A plurality of insertion holes penetrating the recesses with respect to the web 4b (intermediate wall between the recesses 4c) at the lower end of the upper H-shaped steel 4 and the recesses 3c or the recesses 4c are arranged. A plurality of insertion holes penetrating the corresponding portions of the connection fittings 6 may be formed, and fixed through common bolts B and nuts N inserted through the insertion holes. In these structures, as compared with a conventional fixing structure using bolts, it is possible to eliminate protrusions caused by bolt heads or the like on the outer surface of the flange on the excavation side that constitutes the H-shaped steel.

  The insertion part 6a of the connection fitting 6 has a protective member 9 whose both ends are joined and fixed to both inner side walls of the insertion part 6a and each insertion hole 8 is communicated by a cylindrical part. This protective material 9 disperses the load received from the ground side by inserting the shaft portion of the bolt B into the cylinder, and reduces the deposits on the bolt B so that the operability of removing the bolt can be maintained well. To do. The protective material 9 is omitted if the insertion portion 6a is a thick plate. In that case, it is provided as an insertion hole 8 having a horizontal hole shape that coincides with the mounting hole 10.

  The mounting holes 10 are holes through which the bolts B can be inserted, and are provided in a number corresponding to the bolts B. In this embodiment, the mounting hole 10 is a simple hole, but may have a female screw configuration corresponding to the bolt B. The bolt B may be any one of a configuration in which the bolt B is screwed and tightened to the female screw, a configuration in which the bolt B is screwed to the dedicated nut N, and a configuration in which the bolt B is tightened to the female screw and the nut N. The nut N is either fixed to the above-described other flange by welding or the like on the coaxial line with the mounting hole 10, or is configured to be welded to the above-mentioned other flange while being mounted on the mounting plate 7 as in this form. But you can. That is, the mounting plate 7 has a hole or a female screw coaxial with the nut N. For example, when the connection fitting 6 is fixed to the lower H-section steel 3 as shown in FIGS. The flange 3a is fixed to the outer surface on the upper end side. On the other hand, the mounting plate 7 is fixed to the outer surface on the lower end side of the flange 4a of the H-shaped steel 4 when the connection fitting 6 is fixed to the upper H-shaped steel 4. Further, the nut N is not shown in the figure, but a cap nut is preferable in order to reduce the deposits on the screwed portion with the bolt and maintain the bolt pulling operability favorably.

(Underground Continuous Wall Construction Method) FIGS. 3 to 8 show the underground continuous wall 50, the structure construction step, and the upper part recovery created in the building process in the underground continuous wall construction method corresponding to claim 4. Details of the process are shown. That is, in this underground continuous wall construction method, when the wall member 1 is built in a solidified body such as soil cement that solidifies with time, the subsequent wall member 1 is connected to the joint 5 with respect to the preceding wall member 1. The structure which connects via 5 'is made into object. The main part is based on the premise that the above-described wall member 1 is used, and each wall member 1 is built in order while being connected to each other through the joints 5 and 5 'in the solidified body before solidification. A construction process for constructing an underground structure 60 in the excavation part by excavating the excavation part side of the underground continuous wall 50 together with a part of the solidified solidified body 51; The bolt B is removed in the process of backfilling the cut-out portion on the structure 60, and after the backfilling is completed, an upper recovery step of drawing out the upper H-section steel 4 constituting each wall member 1 is performed.

  In the erection process, each wall member 1 opposes the head of the bolt B to the natural mountain side in the operation of erection while connecting the subsequent wall member 1 to the preceding wall member 1 through the joints 5 and 5 '. It differs from the prior art in that it is arranged so as to be on the side of the cut portion. That is, when erected, a groove having a predetermined width and depth is first excavated by a cutter device. In this work, for example, the ground is excavated while the cutter device is moved from the excavation start position along the planned wall construction part while injecting the drilling fluid into the ground to soften the ground, and the design depth and construction length are excavated. When the thickness is reached, cement milk is supplied, and the inside of the groove is filled with the soil cement as the solidified body 51. At the time of erection, the first wall member 1 is erected with respect to the reference steel that is penetrated in advance. Thereafter, with respect to the joint 5 (5 ′) of the preceding wall member 1 that has been installed, the subsequent wall member 1 is suspended and moved up and down while being fitted with the joints 5 and 5 ′. . In this erection operation, each wall member 1 is erected while alternately connecting a member having a male joint and a member having a female joint. These are the same as before.

  Fig.3 (a) has shown typically the underground continuous wall 50 constructed | assembled by the above erection process. In this example, the underground continuous walls 50 are provided in two rows with a width corresponding to the underground structure. In the continuous wall 50 in each place, the upper H-section steel 4 constituting each wall member 1 protrudes slightly from the ground surface GL. This is to make it easier to pull out the H-section steel 4 in the upper recovery step as will be described later. Each wall member 1 is embedded in a solidified body 51 solidified together with the connection fitting 6 except for the upper end as shown in the enlarged view of FIG. In addition, when the wall member 1 having the above configuration is built, the entire size per one is long depending on the construction depth, the site area in the construction site is limited, and when the load on the heavy equipment for construction is large, The upper H-section steel 4 is separated in advance, and the upper H-section steel 4 is temporarily placed on the excavation groove when the lower stage (H-section steel 3, H-section steel 2, etc.) is installed. If the steel 4 is joined and integrated with the lower H-shaped steel 3 by a bolt operation to continue the construction work, the site restrictions and the heavy machinery burden can be reduced.

  In the structure building process, the space between the underground continuous wall 50 and the underground continuous wall 50 is excavated together with a part of the solidified body 51, and the underground structure 60 is constructed at the excavated portion by the same procedure as before. That is, in this work, the ground between the underground continuous walls 50 is excavated from the ground surface to a predetermined depth as shown in FIG. In this case, the open-cut design is made slightly higher than the lower end portion of the lower H-section steel 3 of each wall member 1 (including the configuration composed of a plurality of H-section steels) according to the plan, and this portion is an underground structure. It is set as the support ground surface of the thing 60. Moreover, solidified bodies 51, such as soil cement, adhere to the inner flanges of the H-section steels 3 and 4 constituting the wall member 1 among the opposing surfaces of the underground continuous walls 50, but these adhered substances Is removed.

  In the excavation work, as the excavation depth becomes deeper, the temporary support work 52 made of a cut beam or the like is stretched on the upper side between the underground continuous walls 50 as necessary. By the way, the distribution of the earth pressure P due to the excavation is maximized in the vicinity of the intermediate position in the height direction of each wall 1, but in the wall structure of the underground continuous wall 50, the lower stage constituting the wall member 1 The earth pressure P can be sufficiently resisted by the rigidity of the H-section steel 3 (this lower stage includes a configuration including a plurality of H-section steels) and the solidified body 51 on the outside thereof. Moreover, even if there is groundwater in the ground E, if the position of the lower H-section steel 3 is set higher than the groundwater level by a preliminary survey or the like, the inner and outer double joint structure and the outer solidified body 51 The water-stopping property is also satisfactory.

  After completion of the excavation work, as shown in FIG. 4A, the bottom plate 61, the side wall 62, the partition wall 63, and the top plate 64 of the underground structure 60 are appropriately placed on the supporting ground along the construction direction of the underground continuous wall 50. Built by the formwork method. At that time, concrete is placed as necessary in a state where both sides of the bottom plate 61, both side walls 62 and both sides of the top plate 64, and the main body 2 are joined via a reinforcing bar or the like. As a result, the underground structure 60 is integrated and integrated with the lower H-section steel 3 in which both side walls 62 constitute each wall member, and the underground continuous wall 50 and the wall member even if the side wall 62 is a thin wall. The outer solidified body 51 provides a structure excellent in sufficient rigidity and waterstop.

  In the upper recovery step, after the construction of the underground structure 60 is completed, the upper surface of the top plate 64 is backfilled with the backfilling earth and sand 65 while replacing the temporary support work 52. In this backfilling process, the bolt B used for the wall member 1 is removed. In this case, as shown in the enlarged view of FIG. 4B, when the connection fitting 6 is removed, the lower H-section steel 3 (this lower section includes a configuration made of a plurality of H-section steels) and the upper H-section steel. Although the H-section steel 4 is separated from the support section 52, the H-section steel 4 is integrated with the support section 52, and the upper and lower sections of the H-section steel 3 and 4 are proportional to the fitting force between the insertion portion 6a and the recess 4c or 3c. The self-supporting property is maintained against the earth pressure of the surrounding ground E by the holding force as an object and the earth pressure of the earth and sand 65 for backfilling. And the underground structure 60 will be completely embed | buried as shown in FIG.4 (b) by repeating backfilling and laying down to the surface part GL.

  After that, the earth and sand for backfilling 65 is cured for at least several months to one year as a guideline to achieve consolidation. After confirming the consolidation of the internal ground, as shown in FIGS. 5 to 8, the upper H-section steel 4 constituting each wall member 1 is pulled out using the recovery jig device 80. Done. In the work, first, the penetrating rod means 71 is used to scrape off the solidified body 51 and the like adhering to the upper H-section steel 4 while penetrating from the ground surface side to the vicinity of the connection fitting 6 (hereinafter referred to as “suspending”). Say work). Next, by using the jack means 84, the upper H-section steel 4 is forcibly moved upward to make it easy to pull out the edges. From this state, the H-section steel 4 is pulled out by the recovery jig device 80, and at the same time, the fluidized soil is injected and filled into the gap formed by the withdrawal rod means 71 as the H-section steel 4 is pulled out. The fluidized soil is muddy soil close to the construction ground, but may be ground improved soil such as soil cement. Details are as follows.

  As shown in FIG. 6, the penetrating rod means 71 includes a rotating boring rod 72 having a tip formed in an inclined portion, and tap water and a fluidized treated soil manufacturing plant 74 provided on the upper portion of the boring rod 72 as a water supply unit. Swivel 73 connected to each other via a hose or the like, and a water discharge portion 72a and a fluidized soil discharge portion (discharge portion with a clad lid) 72b provided on the tip side as shown in FIG. And a double tubular supply passage which is provided in the boring rod 72 and communicates with each introduction portion of the swivel 73 and each discharge portion 72a, 72b.

  The above penetrating rod means 71 is used while being held by the heavy work machine 70. The heavy work machine 70 is commonly used as a backhoe and the like. The drive unit is replaced with a telescopic arm, and a boring rod 72 constituting a penetrating rod means 71 is rotatably mounted and held on the arm. The And it carries out in the state which stopped the pump P at the time of a fishing work. The procedure is carried out, for example, by extending the boring rod 72 while extending the arm of the heavy machinery 70 and penetrating tap water from the discharge part 72a. As shown in FIG. 6 [B], this work location is the outer portion of the natural mountain side flange 4a and both sides of the web 4b, that is, the recess 4c. When this operation is performed to a predetermined depth (near the connection fitting 6), the H-section steel 4 can be pulled out.

  Thereafter, the water supply is stopped, the boring rod 72 is once pulled up to the ground surface, the above-mentioned meckle lid is removed, and then inserted again into the suspended cavity. During the filling operation, when the pump P of the fluidized soil production plant 74 is driven, the fluidized soil is discharged from the discharge portion 72b through the swivel 73 and the center side supply passage. In this filling operation, the H-section steel 4 is cut into the H-section steel 3 (and the connection fitting 6) by the jack means 84 shown in FIG. The drawing work is performed.

  FIG. 7A shows a set state of the jig device 80. The basics of the jig device 80 are composed of a suspension fitting 81 connected to the upper end of the upper H-section steel 4, a lifting wire W, and the like, as in the prior art. However, this suspension fitting 81 is connected to the upper end of the H-section steel 4 (using the above-described attachment hole 12 at the upper end), and the upper wall is formed in the pressure receiving portion 82 which is the abutting portion of the plunger 85b. It has a generally inverted U-shaped connecting portion 83. Reference numerals B and N denote bolts and nuts that connect the suspension fitting 81 to the mounting hole 12 provided at the upper end of the H-section steel 4. The bolt B is a normal short shaft type unlike the bolt used in the connection fitting 6. The jack means 84 has a main body 85 a and a plunger 85 b that protrudes from and protrudes into the main body 85 a, the main body 85 a is held on the upper side of the support rod 86 that is received by the upper part of the connection fitting 6, and the plunger 85 b is attached to the suspension fitting 81. It is the structure operated in the state which contact | abutted to the upper side inner surface.

  Then, the work procedure is to drive the jack means 84 from the set state of FIG. Then, as shown in FIG. 7B, the H-section steel 4 pushes up the pressure receiving portion 82 in accordance with the protruding amount of the plunger 85b while receiving the load on the connection fitting 6 side via the support rod 86, and heals. As the tool device 80 is raised, the solidified body 51, the H-section steel 4, and the connection fitting 6 are cut off. Thereafter, as shown in FIG. 8, when the hanging metal fitting 81 on which the wire W is hung is lifted by a heavy machine (not shown), the H-section steel 4 is raised together with the jig device 80 and collected. Further, at this time, the above-described filling operation is performed, and the fluidized soil 87 is discharged from the discharge portion 72b of the boring rod 72 to be filled in the gap or cavity after the drawing. At that time, the jack means 84 and the support rod 86 are pulled out. In addition, the filling operation is performed in conjunction with the drawing speed of the H-section steel 4, thereby preventing ground subsidence and preventing the fluidized soil 87 from overflowing from the ground surface.

  Thereafter, the H-section steel 4 is sequentially pulled out by repeating the same operation. The collected H-section steel 4 is diverted to other construction or is effectively used as a steel material. In particular, when the underground structure is a structure such as a tunnel or a common ditch, the amount of steel recovered is enormous, and resource saving can be achieved.

  As described above, the present invention only has to substantially include the configuration specified in the claims, and details can be changed with reference to the description of the embodiments. As an example, in the construction design, there is a specification in which the upper H-section steel is shorter than usual. In such a specification, the connection force between the insertion portion of the connection fitting according to the present invention and the concave portion of the other end portion of the upper and lower H-section steel is not so strong. Sometimes it may be. For this reason, as the “mounting rods such as bolts” of the present invention, connecting rods such as round steel and square steel or mounting rods, that is, those similar to bolts, are used, and the insertion portion is formed in the recess at the other end. The arrangement includes inserting or press-fitting into the mounting hole on the one flange side, the insertion hole on the insertion portion, and the mounting hole on the other flange side that define the recess. In that case, the head of the bar may be temporarily welded from the excavation side as necessary.

DESCRIPTION OF SYMBOLS 1 ... Wall member 2 ... Bottom H-section steel 3 ... Lower H-section steel (3a is a flange, 3b is a web, 3c is a recessed part)
4. Upper H-section steel (4a is flange, 4b is web, 4c is concave)
5 ... Fitting (Male fitting)
5 '... Fitting (female fitting)
6 ... Connection fitting (6a is an insertion part, 8 is a bolt insertion hole, 9 is a protective material)
8 ... Insertion hole 10 ... Mounting hole 12 ... Mounting hole 21 ... Reaction force plate 22 ... Hydraulic jack 50 ... Underground continuous wall 51 ... Solidified body 60 ... Underground structure (62 is side plate, 64 is top plate)
70 ... Heavy machine for work 71 ... Penetration rod means (72 is a boring rod, 73 is a swivel)
74 ... Fluidized soil manufacturing plant 80 ... Jig apparatus (81 is a hanging metal fitting, 82 is a pressure receiving part, W is a wire)
84 ... Jack means (85a is main body, 85b is plunger)
89 ... Fluidized soil B ... Bolt P ... Pump N ... Nut

Claims (7)

From the mounting hole provided on one flange of the H-shaped steel to the mounting hole provided on the other flange from the connecting bracket arranged across the upper and lower ends where the lower H-shaped steel and the upper H-shaped steel are abutted H or the like, which is connected via a mounting rod such as a bolt that is operated toward the end and has a male or female joint provided along the flange end of each H-shaped steel It is a wall member for underground continuous walls in which shape steels are connected via the joint,
The connection fitting is made of a steel material having a size arranged in a recess defined by both flanges and webs of the H-shaped steel, and is fixed to the recess at one end of the upper and lower ends. The mounting bar disposed in the recessed portion at the other end, and the mounting bar corresponding to the mounting hole of both flanges provided in the inserted portion and defining the recessed portion at the other end. A wall member for underground continuous walls, characterized by having an insertion hole for passing through.   The connecting fittings are used as a set of two pieces, and are arranged in each concave portion defined by both flanges and webs of the H-shaped steel constituting the one end portion, and with respect to each concave portion. It is either fixed by welding, or each connecting metal fitting is fixed through a common bolt using an insertion hole provided in the web and penetrating through the recesses. Item 2. The wall member for underground continuous wall according to Item 1.   The said fitting is formed in the magnitude | size which the said insertion part fits in the said recessed part among the said connection metal fittings, and is arrange | positioned substantially without a clearance gap between the both flanges of the said recessed part. Wall member for underground continuous walls. In the underground continuous wall construction method of connecting the subsequent wall member to each other through the joints when the wall member is built in a solidified body such as soil cement that solidifies with time,
The wall member according to any one of claims 1 to 3 is used as the wall member,
Each wall member is built continuously in the ground while being connected to each other through the joints in the solidified body so that the head of the mounting bar is on the cut-off portion side opposite to the ground mountain side. An erection process to create walls,
A structure building process in which the excavation part side of the underground continuous wall is excavated together with a part of the solidified solidified body and an underground structure is built in the excavation part;
An upper recovery step of removing the mounting bar in the process of backfilling the excavated portion on the underground structure, and extracting the upper H-shaped steel constituting each of the wall members after completing the backfilling; The underground continuous wall construction method characterized by passing through.   In the upper recovery step, by using a penetrating rod means having a rotating boring rod, the solidified body penetrating from the ground surface side to the vicinity of the connection fitting and adhering to the upper H-section steel is scraped off, or 5. The underground continuous wall construction method according to claim 4, wherein fluidized soil is injected and filled into a gap formed as the upper H-shaped steel is pulled out. In the upper recovery step, the main body is directly attached to the upper portion of the connection metal fitting using jack means having a main body and a plunger protruding and retracting from the main body, and a hanging metal fitting connected to the upper end of the upper H-shaped steel. Alternatively, the upper H-shaped steel is moved upward by being held via a support rod and projecting in a state where the plunger is applied to the upper inner wall side of the substantially inverted U shape of the suspension fitting. Or the underground continuous wall construction method of 5.
  Constructed according to any one of claims 4 to 6, the wall members arranged adjacent to each other are connected to each other via the joint, and have the connection fitting projecting from the upper end of the lower H-shaped steel. An underground continuous wall characterized by that.

Images