JP5023219B2 - Precast temporary structure and construction method thereof - Google Patents

Description

  The present invention relates to a precast temporary structure and a construction method thereof, and more particularly, a prefabricated concrete factory and a segment structure in a segment form, and an axial force of a long span temporary structure through prestress after assembly. The present invention relates to a precast temporary structure and its construction method.

  In general, in the case of excavation in order to make an existing subway construction or a basement of a building, first, a hole is first dug to a design depth along a planned plane, and a vertical pile is installed in the hole. Next, when the installation of the vertical pile is finished, a part is excavated and the main girders and lining plates are installed.

  After the installation of the lining plate is completed, the subsequent work is continued while the excavation work and the installation of struts by excavation are repeated.

  Therefore, in order to design such a temporary structure, the earth pressure for each excavation step and the load acting on the strut are repeatedly calculated, and the strut is installed so as to withstand the maximum value. In order to design and construct in this manner, a large number of struts are required, and in most cases, they are arranged very densely within 2 to 3 m.

  The struts arranged in this manner are extremely serious obstacles that hinder the transportation of construction materials, the introduction of heavy equipment, and construction work within the construction site. When it is done, it causes enormous troubles in the molding work and the reinforcing bar work, and it is inevitable that a large number of holes are formed in the structure, so that there is a serious problem in waterproofing the completed underground structure.

  In addition to the temporary method using steel H pile as vertical pile, there is also a method using concrete pile that fills concrete after digging a hole, a method using steel pile and concrete pile at the same time, or There is also a construction method that uses a sheet pile, but there is no significant difference in the basic principle of supporting a ground load by forming a wall surface with a pile after digging a hole in the ground. Also, there is a method using a preflex beam as a vertical pile, and a method of increasing rigidity by attaching an H pile to a sheet pile.

  Among the temporary construction methods for constructing underground structures, there is a construction method for supporting a steel pile using an earth anchor as a method without the above-described struts. In this method, a steel wire or a steel rod is inserted through a hole in the back ground of the pile, and the end of the inserted steel rod is mechanically processed or a chemical method such as epoxy or cement grout. This is a method of fixing a steel pile by tensioning a steel bar after fixing using a steel. Temporary construction constructed by such a method is a construction method that has advantages such as improvement in the difficulty of construction because sufficient internal space can be secured. However, the biggest disadvantage of this method is that when this method is applied in a complex city, in most cases there is a lot of room for complaints due to invading adjacent private land. One of the major problems is the high cost.

  Patent Document 1 proposes a method of removing a strut passing through the middle of an excavated cross section from a temporary structure using a truss. This method is expected to be applicable when the depth is relatively shallow, but a lattice-shaped double H beam is formed near the ground surface, and these are reinforced with vertical and inclined materials, and soil It was devised so that the pressure can be received by these two layers of truss installed at the top. This method was devised to overcome the difficulty of excavation and construction of this structure that occurs due to temporary struts for supporting the ground, and a wide structure enters the lower part of the excavated ground, It is judged that this method is convenient when a narrow structure enters the upper part.

  Patent Document 2, Patent Document 3 and Patent Document 4 present a method for reinforcing a wale using prestress. This method is a technique for further expanding the distance between the struts by placing a wale on top of the already installed wale and tensioning the steel wire, one is when there is an additional wale and the other one Presents a method for reinforcing the flange of an existing H beam. This method is expected to have a certain effect in widening the distance between struts, but because the steel wires are arranged in a straight line, it is different from the distribution of moments in the shape of a wire rod generated in the wale due to earth pressure. Due to the generation of a negative moment, there is a limit to the length of the wales to be reinforced because the moment and the distribution due to the load are different from each other.

  The existing temporary structures and methods are applied between the short diameter of the wales that support the walls such as the retaining wall, slurry wall, and CIP, and the material used for the wales is H-beam steel. In the case of a long axis with a relatively long length (for example, 100 m or more), the axial force of earth pressure increases, so there is a limit in the material of H-beam steel material, and this is overcome. In order to do so, we applied a reinforcing material such as double wales or placed multiple steel wires for pre-stress, which is not only economical but also has sufficient durability against earth pressure There is a problem that cannot be done.

  In order to overcome this, existing molds are formed so that concrete struts are manufactured on site, and concrete is placed in the mold and cured, and then a concrete wall or concrete beam is used as a temporary wall. Although there is a method of forming a structure that supports the structure, this requires a curing time for on-site concrete placement, and therefore has a disadvantage that the construction time becomes long.

  In addition, in this case, there is a problem that not only the internal work space of the temporary wall body is narrowed by the concrete beam but also the disassembly and dismantling work is difficult and cannot be recycled, so that it is not suitable for the temporary structure.

Korean Utility Model No. 20-258949 Specification Korean Patent No. 10-188465 specification Korean Utility Model No. 20-247053 Specification Japanese Patent No. 837994

  The present invention has been proposed in order to solve the above-mentioned problems, and the object thereof is to provide a plurality of segments of concrete material in which a long-span temporary wall having a long length is previously manufactured in a factory. By connecting and supporting the wall body, the precast temporary structure whose structure has been improved so as to obtain a sufficient support force for the long-span temporary wall body while shortening the construction period and its It is to provide a construction method.

In order to achieve the above-mentioned object, the present invention is arranged so as to be adjacent to a temporary wall body, manufactured in a pre-shaped form, and made of a plurality of segment members made of a concrete material,
It is composed of a connecting tool that connects the end portions of the segment members via coupling means and integrates them with other segment members,
The segment member and the connector form a support structure that supports the temporary wall body, and the support member has the segment member arranged in a truss structure .

  A hollow is formed in the segment member.

The coupling means is integrally coupled to the segment member and the end of the connector, respectively, and a finishing plate in which a plurality of fastening holes are formed at the edge,
Each of the segment plates and a reinforcing bar disposed inside the coupler are coupled to the finishing plate.

  The connector is formed with contact portions that protrude outward so that the end portions of the segment members are in close contact with the end portions on both sides.

  It further includes at least one stiffener disposed on the outer peripheral surface of the segment member and protruding outward.

  The segment member is provided with a reinforcing material outside or inside.

  The segment member further includes a tension member coupled to penetrate through the segment member.

The segment member includes a fixing portion that fixes an end of the tendon,
The fixing unit is a fixing anchor coupled to the inner surface of the segment member.

  The tension member is coupled so as to penetrate through the inside of the connector, and a fixing portion for fixing the end of the tension material is disposed inside.

  In addition, an assembly hole through which the tension material penetrates is formed in the connector, and the assembly hole is formed to have different upper and lower heights so that tension materials coupled in different directions do not interfere with each other. It is preferable.

  The connecting tool is formed with a connecting hole communicating with the outside at the center.

A method for constructing a precast temporary structure, which is another characteristic element of the present invention, includes a step of closely attaching a plurality of segment members previously made of a concrete material so as to be shaped in a factory to the inside of the temporary wall,
A step of integrally coupling via a connector so as to connect the end portions of the segment members fixed to the temporary wall body;
A step of fixing the segment member coupled by the coupling tool to the inside of the temporary wall body, and the step of coupling the segment member integrally via the coupling tool, wherein the coupling structure of the segment member is a truss structure It has the form of this.

  The method further includes the step of tensioning the segment member using a tension material after the segment member is integrally coupled via the connector.

  The present invention prefabricates a support structure that supports a temporary wall between long diameters in a factory by a precast method, is made of a concrete material, and has a precast temporary structure whose structure is improved so as to satisfy rigidity. With regard to its construction method, according to this, the present invention is not only able to obtain a sufficient supporting force for the long-span temporary wall body having a long overall length, but also manufactured by a precast method and necessary for concrete curing. Since the time can be shortened, it has a useful effect such as shortening the construction period.

  Moreover, when using the tension | tensile_strength of a tension material after a tension material tensions a segment member, it has the useful function which can provide sufficient support force with respect to the earth pressure transmitted from the temporary wall body side.

It is a top view which shows the structure of one Embodiment of the precast temporary structure which concerns on this invention. It is a block diagram which shows the state before the connection of the partial segment member and connector of this invention. It is a block diagram which shows the state before connecting the segment member of this invention, and a part of connector so that it may have a truss structure. It is a joint state figure showing the state where a segment member of the present invention and a part of connector were connected. It is a block diagram which shows the state by which the support structure of this invention is arrange | positioned continuously. It is a use condition figure which shows the state by which the segment member and the connection tool were connected with the tension material of this invention. It is a top view which shows the combined state of the segment member of this invention, and a coupling tool. FIG. 8 is a front view of FIG. 7. It is a figure which shows the other combined state of the segment member of this invention, and a connector, Comprising: It is a top view which shows the connection structure of a segment member and a connector. FIG. 10 is a front view of FIG. 9. It is a figure which shows roughly various cross-sectional shapes of the coupling tool of this invention. It is a figure which shows roughly various cross-sectional shapes of the coupling tool of this invention. It is a figure which shows roughly various cross-sectional shapes of the coupling tool of this invention. It is a figure which shows roughly various cross-sectional shapes of the coupling tool of this invention. It is a figure which shows roughly various cross-sectional shapes of the coupling tool of this invention. It is a figure which shows roughly various cross-sectional shapes of the coupling tool of this invention. It is a perspective view of one of the coupling tools. It is a front view of FIG. It is sectional drawing which shows roughly various cross-sectional shapes of the segment member of this invention. It is sectional drawing which shows roughly various cross-sectional shapes of the segment member of this invention. It is sectional drawing which shows roughly various cross-sectional shapes of the segment member of this invention. It is sectional drawing which shows roughly various cross-sectional shapes of the segment member of this invention. It is sectional drawing which shows roughly various cross-sectional shapes of the segment member of this invention. It is sectional drawing which shows roughly various cross-sectional shapes of the segment member of this invention. It is sectional drawing which shows roughly various cross-sectional shapes of the segment member of this invention. It is sectional drawing which shows roughly various cross-sectional shapes of the segment member of this invention. It is a figure which shows the shear key structure which is arrange | positioned at the edge part of the segment member of this invention, and a connector, and suppresses a horizontal swing, Comprising: The state in which the some latching protrusion was formed in the edge part of a segment member is shown It is a front view. It is a side view of FIG. It is a front view which shows the state in which one latching protrusion was formed in the edge part of a segment member. FIG. 30 is a side view of FIG. 29. It is a figure which shows the connection structure between the segment members of this invention. It is a figure which shows the connection structure between the segment members of this invention. It is a figure which shows the connection structure between the segment members of this invention. It is a figure which shows the connection structure between the segment members of this invention. FIG. 3 is a perspective view illustrating an example of a fixing unit according to the present invention. It is a top view which shows each usage example with respect to the fixing means of this invention. It is a side view which shows each usage example with respect to the fixing means of this invention. It is a side view which shows each usage example with respect to the fixing means of this invention. It is a side view which shows each usage example with respect to the fixing means of this invention. It is a top view which shows that the nut part and fixing bolt of an anchor form are provided in one side of the segment member. It is a front view of FIG. It is a side view which shows roughly the coupling | bonding structure of the reinforcing bar and finishing plate of the segment member of this invention. It is a flowchart which shows the construction method of the precast temporary structure which concerns on this invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  One embodiment of the precast temporary structure according to the present invention will be described with reference to FIG. 1 to FIG. The segment member 100 which is arranged so as to be close to each other via the fixing means and is filled with concrete is brought into contact with the end of the segment member 100 to be integrated through the coupling means, and the other segment member 100 is connected. It is comprised with the support structure 10 which consists of a connection tool 200. FIG.

  If it demonstrates in detail, the support structure 10 will be arrange | positioned so that the connection tool 200 may interpose between the some segment member 100 which consists of concrete materials, and has a structure integrated by a coupling means.

  Moreover, it is preferable to arrange | position the support structure 10 so that it may have a truss structure for load distribution and stability.

  The segment member 100 has a precast process in which the inside is filled with concrete and is pre-manufactured through a curing process in a factory, regardless of a bar shape or a quadrangular structure with a circular cross-sectional shape.

  Further, the segment member 100 has a known concrete structure in which a reinforcing bar 100A is arranged inside, and preferably has a structure in which a hollow 102 is formed inside in order to reduce its weight.

  Further, the segment member 100 has a structure in which a finishing plate 110 having a structure having a cross-sectional area larger than that of a cross section is integrated at an end portion in a precast process.

  The finishing plate 110 is made of a steel material, and is integrally joined to the end of the reinforcing bar 100A arranged inside the segment member 100 by a method such as welding, and a bolt 50 is fastened to an edge protruding outside the segment member 100. A plurality of fastening holes 112 are formed.

  On the other hand, the finishing plate 110 may have a smaller cross section than the cross section of the segment member 100. In this case, in order to fasten the bolt 50 to the fastening hole 112, A fastening groove 108 communicating with the outside is formed.

  For the segment member 100, a reinforcing material 150 such as a steel material or a steel pipe can be disposed on the outside or the inside for reinforcement and buckling, and other material in which the material of the segment member 100 is not concrete can also be adopted. .

  In addition, the reinforcing material 150 may employ a steel material or a synthetic resin series, but is not limited to these materials.

  In addition, a plurality of stiffeners (150A) in the form of plates are integrally formed on the outer peripheral surface of the segment member 100 so as to protrude outward to prevent buckling.

  The connector 200 is formed with a contact portion 205 protruding outward so as to come into contact with the end portion of the segment member 100, and a finish plate 210 having the same structure as the finish plate 110 of the segment member 100 is also formed at the end portion of the contact portion 205. Is arranged.

  At this time, finishing plates (110, 210) arranged for connecting the segment member 100 and the connector 200 are connected via bolts 50 and nuts, etc., but are not shown in the drawing. However, it can be connected by a known steel rod or pin.

  The connection tool 200 may be made of the same concrete material as the segment member 100, and has a structure in which a hollow 202 is formed inside and at least two contact portions 205 are formed at various angles depending on the connection direction of the segment member 100. Have

  In addition, the fixing means for fixing the segment member 100 to the temporary wall body 20 is concrete between one side surface of the segment member 100 adjacent to one side surface of the temporary wall body 20 as shown in FIGS. Adopting a method of integrating by utilizing a groove filling method of placing a segment, or a method of mounting and fixing the segment member 100 using a bracket-shaped steel structure 600 integrally coupled to the temporary wall body 20 Can be adopted.

  The steel structure 600 includes a fixed plate 610 that is integrated with the temporary wall body 20, and a support plate 620 that is formed to extend perpendicularly to the fixed plate 610 and on which the segment member 100 is placed.

  In addition, the fixing plate 610 and the support plate 620 may employ an H beam or an angle other than the rigid plate shown in the drawing.

  In the groove filling method, a plurality of concave and convex shear keys 105 are formed on one side surface of the segment member 100 to increase the bonding force with the concrete (C), and one end portion is coupled to one side surface of the segment member 100, It is preferable to provide the fixed anchor 106 which the other end part couple | bonds with the concrete cast | placed by groove filling.

  Alternatively, a method using both a fixing method using a steel structure 600 in the form of a bracket and a ditch filling fixing method of in-situ concrete (C) placement can be adopted. In this case, the support of the steel structure 600 is supported. A mold 630 is installed between the segment member 100 placed on the plate 620 and the temporary wall body 20, and concrete (C) is placed on the mold 630 to make the temporary wall body 20 and the segment member 100 concrete (C). It is structured to be integrated with.

  On the other hand, as shown in FIG. 40 and FIG. 41, a nut portion 104 inserted so as to be embedded inside one side surface where a plurality of shear keys 105 are formed, and one end portion is accommodated in the nut portion 104, and the other end And a fixing bolt 103 having an anchor function embedded in the concrete filled between the temporary wall body and one end of the fixing bolt 103 is fastened inside the nut portion 104, and the rest The projecting other end is integrated with the concrete (C) so as to function as an anchor.

  In another embodiment of the present invention, a tension member 300 for applying a prestress to the segment member 100 to bring the segment members 100 into close contact with each other, and a fixing unit that fixes and fixes both ends of the tension member 300. 450 is further provided.

  The segment member 100 is formed with a through-hole 120 through which the tension material 300 passes.

  The fixing unit 450 may be disposed on the segment member 100 or the connector 200 and may be a known fixing anchor having a plurality of holes through which the tension members 300 pass so that the plurality of tension members 300 are inserted and fixed. Preferably, when arranged inside the segment member 100, a fixing groove 420 for receiving a fixing anchor is formed.

  That is, the tension member 300 is connected so as to pass through the inside of the plurality of segment members 100 through the through holes 120 formed in the segment member 100, and the fixation of the tension member 300 is fixed to the end of the connected segment member 100. It has a structure in which the end portions of the tendon members 300 are fixed to the arranged fixing portions 450.

  Preferably, the fixing portion 450 is provided in the connector 200 positioned at the end of the segment member 100, and for this purpose, an assembly hole 220 through which the tension material 300 passes is formed in the connector 200.

  In this case, the fixing unit 450 may be disposed inside or outside the coupling tool 200. When the fixing unit 450 is disposed inside, the fixing unit 450 has a groove or a coupling hole 207 having a structure communicating with the outside for assembly outside. The structure is formed and can be fixed outside by using a fixing anchor arranged in the connecting hole 207 by an operator.

  Further, the connecting hole 207 is provided with a fixing portion 450 for fixing the tension material 300 or functions as a passage through which the tension material 300 penetrates and guides the tension material 300 to the other segment member 100 side. I also serve.

  When the fixing portion 450 is disposed outside the connector 200, the end portion of the tension member 300 that protrudes outward through the through hole 120 is fixed using a fixing anchor. In this case, it is preferable that the groove is formed on the outer side surface of the connector 200 so as to have a space in which the fixing anchor is placed.

  More preferably, the assembly holes 220 are formed to have different upper and lower heights so as not to interfere with each other when the tendon 300 enters in a direction orthogonal to each other or in other directions.

  On the other hand, FIGS. 27, 28, 29, and 30 and FIGS. 31, 32, 33, and 34 are diagrams showing the connecting structure of the segment members of the present invention. The locking protrusions 107 and the locking grooves 109 are respectively formed to have the function of a transverse shear key.

  That is, one or more locking projections 107 are formed at one end of the segment member 100 so as to protrude outward, and the connector 200 is locked so as to be depressed inward so as to correspond to the locking projection 107. It has a structure in which a groove 109 is formed.

  Thereby, the one end part of the segment member 100 is unevenly connected to the one end part of the connector 200, and has a function which suppresses a horizontal rocking | swiveling.

  FIG. 43 is a flowchart showing a method for constructing a precast temporary structure according to the present invention, and a step of closely attaching a plurality of segment members 100 pre-made of a concrete material to the inside of the temporary wall 20 so as to be shaped in a factory. (S1) and the end portions of the segment members 100 fixed to the temporary wall body 20 are connected to each other so that the connecting structure of the segment members 100 has a form of a truss structure and is integrally connected via the connector 200. A step (S2), a step (S3) of tensioning the segment member 100 using the tension member 300, and a fixing means (an example: the segment member 100 integrally connected to the tension member 300 inside the temporary wall body 20). And a step of fixing using a groove filling method (S4).

  At this time, in the step (S4) of fixing the segment member 100 in close contact with the temporary wall body 20, the fixing means can adopt the above-described groove filling method or the method of fixing using the steel material structure 600.

  Further, in the step of tensioning the segment member 100 (S3), the tension member 300 fixed by the fixing unit 450 penetrates the inside of each segment member 100 and both ends are fixed to the fixing unit, whereby each The segment member 100 is brought into close contact with each other and connected to one structure.

  The connecting process of the segment member 100 includes a process of fastening the segment member 100 and the finishing plate (110, 210) of the connecting tool 200 together with bolts using the above-described coupling means.

In the present invention described above, the segment member 100 and the connecting tool 200, which are manufactured in advance using a concrete material at the factory by the precast method, are integrated as the support structure 10, and the temporary wall body 20 having a long span is supported. Have a technical idea.

Claims (16)

A plurality of segment members that are arranged adjacent to the temporary wall body, manufactured in a pre-shaped form, and made of a concrete material,
It is composed of a connecting tool that connects the end portions of the segment members via coupling means and integrates them with other segment members,
The segment member and the connector form a support structure that supports the temporary wall body ,
In the support structure, the segment members are arranged in a truss structure.
A precast temporary structure characterized by that.   The precast temporary structure according to claim 1, wherein the segment member is hollow. The coupling means is integrally coupled to the segment member and the end of the connector, respectively, and a finishing plate in which a plurality of fastening holes are formed at the edge,
2. The precast temporary structure according to claim 1, wherein the precast temporary structure is connected to the finishing plate and includes a rebar disposed in the segment member and a connector.   2. The precast according to claim 1, wherein the connector is formed with contact portions protruding outward so that the end portions of the segment members are in close contact with both ends and diagonal ends. Temporary structure.   The precast temporary structure according to claim 1, further comprising at least one stiffener disposed on an outer peripheral surface of the segment member and protruding outward. The precast temporary structure according to any one of claims 1 to 4 , wherein the segment member has a reinforcing member disposed outside or inside. The precast temporary structure according to any one of claims 1 to 5 , wherein the segment member further includes a tension member coupled so as to penetrate the segment member. The segment member includes a fixing portion that fixes an end of the tendon,
The precast temporary structure according to claim 7 , wherein the fixing unit is a fixing anchor coupled to an inner surface of the segment member. The precast temporary structure according to claim 7 , wherein an engaging protrusion and an engaging groove each having a concavo-convex shape are formed at a portion where the segment member and the end of the connector come into contact with each other. The precast temporary structure according to claim 7 , wherein a plurality of concave and convex shear keys are formed on one side surface of the segment member. A nut portion inserted so as to be embedded inside one side surface in which a plurality of the shear keys are formed;
The fixing device according to claim 10 , further comprising a fixing bolt having one end portion accommodated in the nut portion and having the other end portion embedded in concrete filled between the temporary wall body and having an anchor function. The precast temporary structure described. The precast temporary structure according to claim 7 , wherein the tendon is coupled so as to penetrate through the connector, and a fixing unit that fixes an end of the tendon is disposed therein. . An assembly hole through which the tendon penetrates is formed in the connector,
The precast temporary structure according to claim 12 , wherein the assembly holes are formed to have different upper and lower heights so that tension members coupled in different directions do not interfere with each other. The precast temporary structure according to claim 12 , wherein the connection tool is formed with a connection hole communicating with the outside at the center. A step of closely attaching a plurality of segment members previously made of a concrete material so as to be shaped in a factory to the inside of the temporary wall body;
A step of integrally coupling via a connector so as to connect the end portions of the segment members fixed to the temporary wall body;
Fixing the segment member joined by the connector to the inside of the temporary wall body ,
In the step of integrally connecting the segment members via the connector, the connecting structure of the segment members has a form of a truss structure,
The construction method of the precast temporary structure characterized by the above-mentioned. The precast temporary structure according to claim 15 , further comprising a step of tensioning the segment member using a tension material after the segment member is integrally coupled via the connector. Construction method.

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