JP4060323B2 - Bracket support type downward frame driving system and downward frame driving method using the same - Google Patents

Description

  The present invention relates to a bracket-supporting type downward frame driving system and a downward frame driving method using the same, and in the construction of an underground structure using an unsupported reverse driving method, a beam of a construction layer and a slab type While concrete is placed on the frame, it is not a system that suspends and supports the concrete load using the suspension material on the upper slab that has been pre-constructed as in the past. -Type support bracket, bracket support-type downward frame placing system that directly supports a frame support column using a support beam supported by the movable assembly-type support bracket, and a downward frame placement method using the same About.

  In general, there are two methods for constructing an underground structure. In other words, after earth retaining work is performed on the ground where the underground structure will be built, a temporary facility that can support the earth retaining is excavated while excavating the ground, and after all the earth and sand have been removed, the structure is constructed from the bottom layer. After constructing the first-floor structure by constructing the earth retaining method and constructing the earth retaining structure, construct the structure while excavating the ground from the upper part to the lower part using the structure as a retaining beam. That is the reverse placement method that goes.

  Recently, underground work has become deeper due to the dimension of maximization of land use. In particular, when construction is carried out by the forward-placed construction method, there are also visual problems as well as problems such as the risk of soil collapse and the occurrence of cracks due to settlement of surrounding buildings. Due to concerns and problems such as a long construction period, the reverse placement method has been developed and applied recently.

  In the case of the reverse casting method, construction is performed from the ground floor toward the underground layer when building the underground structure, so the underground structure and the ground structure can be constructed at the same time. Since the bottom of the can be used as a work place, there is no need for a separate lining plate, and there is an advantage that the unsupported formwork described later is possible.

  As such a reverse placement method, concrete slabs and beams are placed on the ground with the ground stopped (Concrete on Grade), and after excavating the ground to some extent and leveling the ground, support is established. The method of placing concrete and placing concrete (Form on Supporting) is usually used.

  Among these, the method using the support is a method applied to the strata having a relatively high relative density, and is a method in which concrete is placed after excavating the ground first, installing the support and the formwork.

  However, when the support is used, the support on soft ground is unstable, and it is impossible to dismantle unless the upper layer concrete strength is maintained above a certain limit. Due to this, the lower level excavation work cannot be performed.

  Furthermore, after carrying out temporary materials such as formwork and support to the outside of the excavation work site, they must be moved to the lower layer after excavation and installed, and this must be repeated for each layer construction. There is a problem that it is troublesome to repeatedly carry out a complicated operation.

  In addition, after placing concrete, a sufficient curing period must be waited until the structure develops various strengths, so work waiting time is inevitable, and support and formwork are transported and reassembled. Not only is it uneconomical because it is excessively expensive and time consuming, but since all work depends on manpower, it is labor intensive, so it is difficult to reduce costs in the reality that the problem of labor shortage of functional workers becomes serious There is a problem.

  In order to solve the above problems, when constructing an underground structure, the Non Supporting Formwork System for Top Down Construction However, instead of not installing a support for supporting the formwork, a non-supporting reverse casting suspension formwork method is proposed in which the formwork is suspended from the pre-constructed upper concrete slab.

  This non-supporting reverse placement hanging formwork method is a method of constructing a lower slab using a formwork in a state where the formwork is suspended using a suspension material on the previously constructed upper layer slab.

  In order to build the underground structure of each layer using this method, after placing concrete on the mold and pre-constructing the upper slab, the mold used during the construction of the upper slab is placed above the upper slab. The lowering slab is lowered by using the suspension lowering device positioned at the position and the lower slab is constructed by using the lowered formwork.

  Such a suspended construction method is more advantageous from the viewpoint of securing a work place and worker security because the formwork is suspended from the slab of the previously constructed layer without installing a support at the bottom of the slab. Yes, it is possible to continuously dig underground regardless of the formwork, and by securing a sufficient curing period, excellent concrete quality can be obtained, and the work period and cost can be reduced. There is an advantage.

  In particular, when the suspension method is applied, the three-stage process of underground frame construction for continuously suspending the formwork suspended on the upper slab, excavation work at the bottom, and construction work for the above-ground structure should be performed simultaneously. Can do.

  However, there are the following problems even in the suspension type construction method already developed as a non-supporting construction method.

  In the conventional suspension material support method, when the formwork is lowered, the suspension system, which is the power source, and the suspension material are all supported by the upper-layer concrete slab that has been previously constructed. After lowering and re-installing according to the height of the lower layer, concrete construction of the lower layer slab is performed.

  That is, it is composed of a system in which the load of concrete placed on the lower layer slab is supported by the upper layer slab preliminarily applied via the formwork and the suspension material.

  In this way, an unreasonable load may be applied to the upper slab while the load of the lower concrete placed on the formwork acts entirely on the upper slab. Slab concrete construction is inevitably possible only after construction of the upper slab is completed.

  Therefore, it is a fact that there is an unavoidable problem of the construction period delay due to the curing period of the pre-constructed slab, and therefore there is a demand for a method that can solve the problem caused by supporting the formwork on the upper slab.

  In the suspended construction method, the lower end of the suspension material is fixed to the formwork frame at the slab position. This is a deck plate that is increasingly used due to the advantages of non-supporting construction that allows the formwork frame to be removed. There was a problem that it was not suitable for the construction of the (Deck Plate).

  Accordingly, the present invention has been made to solve the above-described problems, and during the construction of an underground structure, the concrete load is applied while the concrete is placed on the beam and slab formwork of the construction layer. Is not a system that suspends and supports the upper layer slab that has been previously constructed by using a suspension material, but a movable assembling support bracket that is fixedly supported by the supporting column for the frame, and the column support by the moving assembling support bracket. By providing a bracket-supporting type downward frame placing system that directly supports a frame supporting column using a support girder, and a downward frame placing method using the same, the load of the lower concrete is applied to the upper layer slab. The existing problems due to the action can be solved, and the beam support and slab construction of the lower layer can be performed regardless of the construction state of the upper slab by column support, and the construction period is also long It is an object to be reduced.

    The present invention provides a retaining wall, a plurality of frame support columns vertically fixed in the inner ground, a beam and slab building structure including a formwork, and the beam and slab building structure. In the downward framework placing system for constructing an underground structure including the means, the means for supporting the beam and the slab construction structure are separated from each other and connected to each other around the corresponding pillar in each pillar. It is constructed in a structure that can be connected, and is fixedly supported on each pillar by being joined at the height of the corresponding layer to be constructed, and on the other hand, a movable assembly-type support bracket that can move its position on the pillar at the time of separation A support girder that is horizontally connected between the two pillars and that has both ends supported by the movable assembly support brackets and supports the beam and the slab building structure on the upper side; It is characterized by that.

  Further, in the downward frame placing method in which an underground structure including a beam and a slab is constructed from the ground floor to the underground layer, a retaining wall is constructed, and a frame supporting column is constructed in the inner ground. After the ground excavation, the step of fixing and installing the stopper means and the support bracket on the outer surface of each column and the inner surface of the retaining wall respectively, and the movable assembly type support bracket according to the height of the beam and slab And press and assemble on each column and fix and support by the stopper means, and a method of supporting an end portion on the movable assembly type support bracket and the support bracket of the earth retaining wall and between the two adjacent columns and the column and the earth retaining material. A step of horizontally supporting a support girder, which is a length steel material, between the wall, a step of supporting a beam and a slab building structure on the support girder, and a placement and curing of the beam and slab concrete. If you do Excavating the lower ground and installing the stopper means on the pillar and the support bracket of the retaining wall in the same manner at the lower height, and after the concrete is cured to a certain level, the movable assembly type support bracket Move the support girder to the lower layer height and reinstall it in the same way, re-install the beam and slab building structure at the lower layer height, place concrete and cure, and repeat the above steps And a step of constructing a structure of a lower underground layer.

  According to the bracket support type downward frame driving system and the downward frame driving method using the bracket supporting type according to the present invention, when the underground structure is constructed, the concrete is cast on the beam and the slab formwork of the construction layer. Rather than a system that suspends and supports the concrete load using a suspension material on a previously constructed upper slab as in the past, the movable assembly support bracket that is fixedly supported by the support column for the frame and the movement By providing a support system for a downward frame that is supported directly on a support column for a frame using a support beam that is supported by a column by an assembly type support bracket, and a method for driving a downward frame using the same, a lower layer is provided. Can solve the conventional problems caused by the load of concrete acting on the upper slab, and supports the lower beams and slabs regardless of the upper slab construction status by column support Possible, and also it is possible to shorten the construction period.

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

  TECHNICAL FIELD The present invention relates to a bracket-supporting downward frame placing system and a downward frame placing method using the same, and in particular, when constructing an underground structure, concrete is applied to a beam and a slab formwork of a construction layer. Is not a system that suspends and supports the concrete load using a suspension material on the upper slab that has been pre-fabricated as in the past, but is a fixed assembly support bracket that is fixedly supported by a support column for a frame. In addition, the main feature is to directly support the frame support column using the support beam supported by the movable assembly type support bracket.

  As described above, according to the present invention in which the formwork is supported by the frame support pillar, the conventional problem caused by the lower layer concrete load acting on the upper layer slab can be solved.

  The support bracket and the support girder according to the present invention include a beam construction structure used when a concrete beam is placed, that is, a beam formwork and a slab construction structure used when a slab concrete is placed, that is, a non-supporting horizontal structure. A support frame, such as a Holly Beam or a long span (LS) formwork, is directly supported at a fixed height determined by a pre-constructed frame support column.

  The suspension material in the bracket support type system according to the present invention is not only used for supporting means for supporting the beam and the slab building structure as in the conventional case, but only for simple boarding / alighting use of the support bracket and the support beam. Used.

  In addition, it is possible to fix the position where the suspension material for getting on and off is fixed at a predetermined height in each column, not the slab formwork frame for supporting the slab construction structure as in the past. In addition, since it can be disassembled as necessary, it is the movable assembly type support bracket of the present invention in which the fixed height on the pillar can be adjusted according to the height of the construction layer.

  Therefore, after supporting a supporting girder such as an H-shaped steel arranged between the columns on the movable assembly support bracket supported by the column, and installing the beam form on the support girder, the beam form In addition to installing a holly beam, long span formwork, etc., when a deck plate (Deck Plate) is simply installed and concrete is placed, it is possible to construct a deck slab.

  Hereinafter, the downward frame driving system of the present invention including a movable assembly support bracket and a support beam supported by a column will be described in more detail with reference to the accompanying drawings.

  The downward frame placing system according to the present invention includes a beam form frame and a structure for constructing a slab that is supported and installed on the beam form frame by using a column-supported temporary structure during concrete placement of the beam and slab. Because it is supported by the supporting columns for each frame that has already been constructed, the conventional suspension system that has been developed as a non-supporting construction method, that is, the conventional suspension system that supports the upper frame slab that has been pre-constructed with a suspension material. There are obvious differences from the no-support system.

  The temporary structure of the present invention is fixed between the supporting girders arranged horizontally between the pre-constructed vertical columns for supporting the beam form frame from the lower side and the heights defined on each column. The support girder in the state of supporting the beam formwork is supported from below, and if necessary, the height fixed on the corresponding column can be adjusted according to the height of the corresponding layer to be constructed Includes support bracket.

  First, Fig. 1 shows a bracket support type downward frame driving system of the present invention using a column support temporary structure. In Fig. 1, symbols S and G denote slabs in which concrete is cast. Reference numeral 19 denotes a beam formwork (using plywood and iron plate), of which a beam side plate is indicated by reference numeral 19a, a beam bottom plate is indicated by reference numeral 19b, and a formwork support frame is indicated by reference numeral 19c.

  Reference numeral 10 denotes a frame support column installed after the construction of the retaining wall 1, and the movable assembly type support brackets 100 and 200 of the present invention are attached to the column 10 by stratified beams (G) and slabs ( S) is fixed at a predetermined height according to the height of S), and the support beam 300 of the present invention is supported on the upper side thereof by the movable assembly type support brackets 100, 200. 19 and other structures 21 for placing slab concrete supported by the beam form 19 (applied by a holly beam in FIG. 1).

  At the time of construction of an underground structure, an H-shaped steel column is generally mainly used as a supporting column 10 for a frame to be constructed. However, FIG. 1 shows that a circular steel pipe is filled with concrete instead of an H-shaped steel column. An example is shown in which a synthetic steel tube column, that is, a CFT (Concrete Filled Steel Tube) column is installed, and the CFT column can be used as an underground structure by constructing reinforcing bars and concrete around it.

  Further, reference numeral 300 denotes a support beam, and reference numerals 100 and 200 denote movable assembly support brackets. Of these, the support bracket 100 is the first embodiment, and is a two-way slab system. An assembly type support bracket that can be used for the present invention is shown, and a support bracket denoted by reference numeral 200 is a second embodiment, and shows a detachable support bracket that can be used for a one-way slab system.

  Here, the assembly type support bracket 100 and the detachable type support bracket 200 according to the present invention are selectively applied according to the slab system, but in FIG. .

  The support girders 300 are horizontally arranged between the vertical frames 10 for frames and are horizontally supported to support the beam form frame 19 from below while being supported by movable assembly-type support brackets 100 and 200 fixed to the columns 10. It is a length steel material, and can be implemented by an H-section steel or truss type steel beam.

  The movable assembling support brackets 100 and 200 are fixed on the respective pillars 10 to support the upper support girders 300. In particular, the movable assembling support brackets 100 and 200 are fixed with a suspension material 17 (Jacking Bar) for getting on and off. Be prepared to be able to.

  The movable assembly-type support brackets 100 and 200 have a fastening frictional force that acts on the circumferential surface of the column 10 in a state where the circumferential surface of the column 10 is crimped, and a stopper means that protrudes from the circumferential surface of the column 10. 15, the vertical position is fixed at a predetermined height on the pillar 10.

  In particular, as will be described later, the movable assembly type support brackets 100 and 200 have a structure that can be disassembled from the column 10, but when the suspension member 17 is lowered by the suspension lowering device 18 in a state of being disassembled from the column 10. The movable assembling support brackets 100 and 200 are also lowered while the suspension member 17 is smoothly lowered below the slab (S) through the through hole (S ′) provided at the slab (S) position around the beam (G). It comes to descend.

  Thus, when the support brackets 100 and 200 are lowered, the upper support girders 300 are both lowered. However, the beam frame 19 and the slab construction structure (holly beam 21 or long span frame, etc.) used above are used. Can be lowered and re-installed.

  On the other hand, in the embodiment of the present invention for supporting the temporary structure adopted in the construction system according to the embodiment of the present invention with reference to FIGS. The support girder and the support bracket, which are such means, will be described in more detail as follows.

  First, FIGS. 2 to 6 show a first embodiment of a support bracket according to the present invention, which shows an assembly-type support bracket that can be used for a two-way slab system.

  FIG. 2 is a plan view showing the assembly type support bracket according to the first embodiment of the present invention, and FIG. 3A is a perspective view showing the assembly type support bracket according to the first embodiment of the present invention. 3B is a cross-sectional view taken along the line AA in FIG. 3A, and FIG. 4 is a perspective view showing the assembly-type support bracket according to the first embodiment of the present invention. Clearly shows the state of the division.

  FIG. 5 is a perspective view showing a column support state of the assembly type support bracket and the support beam according to the first embodiment of the present invention, and FIG. 6 is a view of the assembly type support bracket and the support beam according to the first embodiment of the present invention. It is a perspective view which expands and shows a clamping state.

  Reference numeral 10 denotes a CFT column filled with concrete, reference numeral 300 denotes a supporting girder (applied with H-shaped steel) connected to another peripheral column 10, and reference numeral 15 denotes a circle of the column 10. The stopper means provided on the peripheral surface is shown.

  As shown in the drawing, the assembly type support bracket 100 is configured to support the support beam 300 from below, and in particular, two sub brackets 100a, which are joined or divided along a diagonal joining (or dividing) line. Although the two sub-brackets 100a and 100b are combined with each other, the two crimping portions 120a and 120b located at the upper and lower portions of the center of the pillar 10 are arranged on the circumferential surface of the column 10 from above and below. It is designed to be crimped simultaneously.

  Specifically, the sub-brackets 100a and 100b each have an “L” -shaped horizontal upper receiving plate 110 to which the suspension member 17 is fixed and supports the end of the support beam 300, and the center of the coupled state. Two semicircular pressure-bonding plates 122 and 124 that are arranged vertically at positions and press-bond the upper and lower outer surfaces of the pillar 10, and each upper side pressure plate 122 at the corners and the center of the upper receiving plate 110 are connected and supported. Three upper vertical plates 130 and three support frames 140 forming an inverted triangular support structure by connecting a central lower crimping plate 124 from an outer end of each upper vertical plate 130 are integrally configured.

  In the assembled state, the semicircular pressure plates 122, 124 of the sub brackets 100a, 100b are combined with the corresponding semicircular pressure plates of the corresponding sub bracket so that the circumferential surface of the pillar 10 is pressure bonded to both. Thus, one circular crimping portion 120a, 120b is formed.

  Here, three separate lower vertical plates 126 are installed on the lower crimping plate 124, and the lower end of the corresponding support frame 140 is fixed to each lower vertical plate 126. The upper end is fixed to the corresponding upper vertical plate 130 and the lower end is fixed to the corresponding lower vertical plate 126.

  Here, as shown in the drawing, the two support frames 140 arranged in the 180 ° direction are one angle frame, and the support frame 140 arranged in the 90 ° direction between them is for securing a sufficient support force. It consists of two angle frames.

  Further, the lower end of the suspension member 17 is fixed to the upper receiving plate 110 by a fixing tool 17a. However, as shown in the drawing, the two suspension members 17 are fixed to a single upper receiving plate 110 at positions symmetrical to each other. .

  Of course, as described above, the suspension member 17 according to the present invention is not used for supporting concrete loads, but is used for simply getting on and off the bracket 100 and the support beam 300, and therefore, during the concrete placement of the construction layer. In addition, it is not necessary to provide a large support force against the concrete load at the upper end of the suspension member 17, and it is possible to use a boarding / alighting device capable of providing a relatively small support force in addition to the suspension and descent device. The same applies to the detachable support bracket described later.

  As a preferred embodiment, a separate horizontal reinforcing plate 150 arranged in parallel with the upper receiving plate 110 is installed between the upper vertical plates 130 of the sub brackets 100a and 100b. A vertical reinforcing plate 160 is installed between the horizontal reinforcing plate 150 and the bracket structure so that it can sufficiently withstand the load transmitted through the support beam 300 without deformation as a whole.

  In addition, of the three upper vertical plates 130, the outer surfaces of the two upper vertical plates disposed on both sides in the 180 ° direction are surface-bonded to the corresponding surfaces of the upper vertical plates 130 of the opposite sub brackets during assembly. At this time, the two upper vertical plates 130 on both sides joined to each other are fastened by bolts 132 and 134 at both end sides and fixed to each other.

  In the same manner as the upper vertical plate 130, the outer surfaces of the two lower vertical plates 126 arranged in the 180 ° direction on both sides are also surface-bonded to the corresponding surfaces of the lower vertical plate 126 of the opposite sub bracket when assembled. At this time, the two lower vertical plates 126 on both sides joined together are fastened with bolts 128 and fixed to each other.

  In addition, the two support frames 140 arranged in the 180 ° direction are fastened to each other by bolts 142 at appropriate positions with the corresponding support frames 140 of the opposite sub-brackets, and fixed to each other.

  Here, a plurality of bolting numbers are provided for each part between the two sub brackets 100a and 100b on both sides, and in the illustrated embodiment, one bolt fastening point is placed at the center of the support frame 140. Changes can be made as appropriate.

  Further, the topper means 15 is provided on the circumferential surface of the column 10 so that the assembly of the two sub brackets 100a and 100b, that is, the combined support bracket 100 is firmly fixed on the column 10. The four protruding plates 15a having a predetermined thickness are preferably welded and installed on the circumferential surface of the column 10 at equal intervals in the circumferential direction.

  Each protruding plate 15a serves as a latching projection for supporting the lower pressure-bonding plate 124. The two protruding brackets 15a and 100b are bonded to the circumferential surface of the column 10 in a state where the two sub-brackets 100a and 100b are assembled. The lower pressure-bonding plate 124 is hooked on the lower side and fixed.

  In the temporary structure of the present invention, which is a means for supporting the beam and slab building structure, the movable assembling support bracket 100 and the support beam 300 include the upper receiving plate 110 and the upper receiving plate 110 of each sub bracket. The overlapping portion of the end portion of the support beam 300 supported on the upper side of the support beam 300 is clamped by a plurality of clamps 400 and fixed so as not to move.

  That is, as shown in FIG. 6, the H-shaped steel used as the support beam 300 is supported on the upper side of the upper support plate 110 of the sub bracket, and the lower plate of the H-shaped steel and the upper support plate of each sub bracket. The overlapping portions are clamped and fixed to each other by the clamp 400 at a plurality of positions.

  Thus, the structure of the clamp 400 that fixes the support bracket and the support beam to each other is similarly adopted in the detachable support bracket described later.

  As a result, the assembled support bracket 100 of the present invention is firmly fixed on the circumferential surface of the column 10 by forming an inverted pyramid support structure as a whole in an assembled state with the column 10 in the center. The support beam 300 is supported on the upper side in a state of being fixed to.

  Further, the upper receiving plates 110 that support the support beam 300 in the two sub brackets 100a and 100b form a square receiving plate having an opening at the center in a state of being combined with each other. The column rebar 22 can be penetrated through and the periphery of the CFT column 10 is in the form of an opening, so that the form work and rebar work of the reinforced concrete column (in which the CFT column is incorporated) are facilitated. .

  Of course, the area of the opening 112 formed by the upper receiving plates 110 on both sides should be larger than the cross-sectional area of the reinforced concrete column constructed by placing the rebar 22 around the CFT column 10 and then placing the concrete 23 thereon. Is natural.

  In order to construct the lower beam and slab after the upper beam and slab are constructed, the movable assembly type support bracket 100 and the support girder 300 of the present invention are lowered to the lower layer height in the same manner. However, at this time, as a descending method, a method of sequentially descending in units of one panel and a method of descending sequentially for each component can be used.

  Each of the assembly-type support brackets 100 can be separated from each other along a bisector line in the diagonal direction, but after releasing the bolts that fasten the two sub brackets 100a and 100b to each other, one of the sub brackets 100a. In the state in which the other sub bracket 100b is first removed from the column 10 and lowered while being supported by the suspension member 17, the beam form frame can be disassembled in units of one panel (= 1 span × 1 span). As shown in (a).

  FIG. 7 (a) shows the arrangement of supporting girders (applied with H-section steel) and the method of lowering one panel unit in a two-way slab (or two-way dex slab) unsupported formwork system. Indicates a plurality of support girders that are arranged on the same plane in a state where both ends are supported on the upper receiving plate 110 of two adjacent assembly-type support brackets 100 supported by the pillars 10. A primary working suspension material (Jacking Bar), and a reference numeral 17N denotes a non-operational suspension material.

  As shown in the figure, since the assembly type support bracket 100 of the present invention can be separated along a diagonal dividing line with the CFT column 10 as the center, the sub brackets 100a and 100b located in the primary down section By disassembling the support girders 300 at the same time, it becomes possible to disassemble the beam-shaped frame in units of one panel (hatched portion in FIG. 7A).

  In addition, as another method, there is a method of sequentially lowering each component instead of the method of lowering one panel unit as described above, and this will be described with reference to FIG.

  In FIG.7 (b), the slab support beam 301 which further supports the structure for slab construction (for example, deck plate for dexlab construction) is shown together.

  In this method, after disassembling each assembly-type support bracket 100, the two sub brackets 100a and 100b are simultaneously lowered using the suspension material without being lowered separately.

  The process of sequentially lowering each component will be described. The suspension member 17 of the electric hoist device is connected to the assembly type support bracket 100. At this time, the two sub brackets 100a and 100b on both sides of each assembly type support bracket 100 are connected. All the suspension members 17 are connected to each other.

  A suspension material such as a chain of the electric hoist device is also connected to the support beam 300 and the slab support beam 301.

  In FIG. 7B, the symbol P indicates a jacking point at which the suspension member is connected at the support beam 300 and the slab support beam 301.

  Next, the assembly type support bracket 100 is disassembled and the two sub brackets 100a and 100b are suspended and lowered at the same time, and the assembly type support bracket 100 is similar to the upper layer in accordance with the lower beam and slab height. Reinstall by the method.

  Thereafter, the support girder 300 is suspended by the suspension material, and then the slab support beam 301 is suspended, and these are re-installed in the same manner at the height of the lower layer.

  Of course, when the re-installation of the assembly-type support bracket 100, the support girder 300, the slab support beam 301, the beam and the slab building structure is completed at the lower layer height, concrete is cast to construct the lower layer structure. .

  8 to 13 show a second embodiment of the support bracket according to the present invention, which shows a detachable support bracket that can be used for a one-way slab system.

  FIG. 8 is a perspective view showing a detachable support bracket according to the second embodiment of the present invention, and FIG. 9A is a perspective view showing the detachable support bracket according to the second embodiment of the present invention. 9 (b) is a cross-sectional view taken along line BB in FIG. 9 (a), and FIG. 10 is a perspective view showing a detachable support bracket according to the second embodiment of the present invention. FIG. 10 shows the divided state well. FIG. 11 is a perspective view showing a column support state of the detachable support bracket and the support beam according to the second embodiment of the present invention.

  Reference numeral 10 denotes a CFT pillar, and reference numeral 300 denotes a support beam that is connected to the other pillars 10 in the vicinity.

  Reference numeral 17 denotes a suspension bar (Jacking Bar) connected and fixed to the upper receiving plate 210, and reference numeral 15 denotes stopper means that protrudes from the circumferential surface of the column 10.

  As shown in the figure, the detachable support bracket 200 supports the support beam 300 from below, and can be fixedly coupled to each other by a plurality of bolts 238 and can be disassembled when the bolts 238 are released. The two sub-brackets 200a and 200b are composed of two sub-brackets 200a and 200b. When the two sub-brackets 200a and 200b are assembled with each other by the bolt 238, the central crimping plate 220 moves the circumferential surface of the column 10 left and right. The upper and lower positions are fixed by stopper means 15 fixedly installed in advance on the column 10 in the same manner as the assembly type support bracket in the crimped state.

  More specifically, each sub bracket 200a, 200b has an upper receiving plate 210 to which the lower end of the suspension member 17 is fixed and supports the end of the support beam 300, and a lower side of the upper receiving plate 210. Two vertical side plates 230 formed with bolt fastening portions 232 that are fastened side by side to form both side surfaces of the sub-bracket and overlapped with the mating side when joined, and the lower side of the upper receiving plate 210 And a crimping plate 220 fixed between the two side plates 230 and crimping one side of the outer surface of the column, and a bottom plate 240 fixed between the two side plates 230 and forming the bottom surface of the sub bracket. Is done.

  Here, the crimping plate 220 is a circular curved plate that can crimp one side of the circumferential surface of the circular cross-section column 10.

  The lower end of the suspension member 17 is fixed to the upper receiving plate 210 of each sub bracket 200a, 200b by the fixture 17a, but the corresponding suspension member in which each sub bracket 200a, 200b is connected to the upper receiving plate 210 when lowered. 17 is supported.

  Preferably, a plurality of vertical reinforcing plates 252 and 254 arranged vertically and horizontally are fixedly installed between the upper receiving plate 210 and the bottom plate 240 of each of the sub brackets 200a and 200b so that the bracket structure is not deformed as a whole. Thus, the load transmitted through the support girder 300 can be sufficiently endured.

  That is, the lateral reinforcing plates 252 that are arranged side by side with the both side plates 230 and fixed to the opposing surfaces of the upper receiving plate 210 and the bottom plate 240 and the outer peripheral surface of the crimping plate 220, and the two side plates 230 are disposed laterally. In addition, the vertical reinforcing plates 254 fixedly installed on the opposing surfaces of the upper receiving plate 210 and the bottom plate 240 and the both side plates 230 and the horizontal reinforcing plate 252 can be installed.

  Further, the stopper means 15 is provided on the circumferential surface of the column 10 so that the assembly of the two sub brackets 200a and 200b, that is, the combined support bracket 200 is firmly fixed on the column 10. The four protruding plates 15a having a predetermined thickness are preferably welded and installed on the circumferential surface of the column 10 at equal intervals in the circumferential direction.

  Each projecting plate 15a serves as a latching projection for supporting the crimping plate 220, and two crimps that crimp the circumferential surface of the column 10 in a state where the two sub brackets 200a and 200b are assembled. The plate 220 is hooked on the lower side and fixed.

  As in the assembly type support bracket, the support bracket 200 and the support beam 300 have a plurality of overlapping portions of the upper receiving plate 210 of each sub bracket and the end portion of the support beam 300 supported on the upper side of the upper receiving plate 210. The clamp 400 is fixed so as not to move with respect to each other.

  That is, in a state where the H-shaped steel used as the support beam 300 is supported on the upper side of the upper bracket receiving plate 210 of the sub bracket, the overlapping portion of the lower plate of the H shaped steel and the upper receiving plate 210 of each sub bracket has a plurality of positions. The clamp 400 clamps each other and is fixed.

  The bolt fastening portion 232 is an overlapping portion of the ends of both side plates 230 where the bolt fastening with the opposite sub bracket is performed in each of the sub brackets 200a and 200b, and the bolt 238 can be fastened to the overlapping portion. This is a part formed by forming a structure.

  That is, when the inner week surface of each crimping plate 220 is in close contact with the circumferential surface of the column 10 in the pair of sub brackets 200a and 200b, the end portions of the side plates 230 of one sub bracket are the other sub bracket. And a plurality of fastening holes 234 are formed in the overlapping portion of the sub bracket 200a that overlaps the inner side of the sub bracket 200a, and the sub bracket 200b that overlaps the outer side of the sub bracket 200b. A plurality of notch grooves 236 matched with each fastening hole 234 are formed in the overlapping portion so as to be arranged vertically.

  When assembling the two sub brackets 200a and 200b, the inner peripheral surface of the crimping plate 220 of each sub bracket is brought into close contact with both of the circumferential surfaces of the pillars 10, and the bolt fastening portions 232 of the respective sub brackets are stacked and brought into close contact with each other. After that, the bolt 238 is inserted into the fastening hole 234 and the notch groove 236 and fastened.

  At this time, the bolt fastening portion 232 of the sub bracket 200b that overlaps the outer side is formed with a fastening structure in the form of a notch groove having a certain length instead of a hole shape, so that the combination and removal / attachment of the bracket becomes easier. Preferably, rather than forming the notch groove 236 long in a straight line, as illustrated, it is advantageous to form a notch in a stepped shape from the end of each side plate 230 in order to maintain a more rigid combined state. It is.

  After all, the detachable support bracket 200 as described above is firmly fixed on the circumferential surface of the column 10 while being supported by the stopper means 15 with the column 10 sandwiched in the center, and fixed in this way. In this state, the support beam 300 is supported on the upper side.

  Similar to the assembly type support bracket 100 described above, the detachable support bracket 200 has a tightening frictional force that acts on the circumferential surface of the column 10 in a state where the circumferential surface of the column 10 is crimped, and the corresponding column 10. The upper and lower positions are fixed at a predetermined height on the pillar 10 by the stopper means 15 projecting and installed on the circumferential surface.

  FIGS. 12 and 13 (a) and 13 (b) show a detachable support bracket that can be applied when a normal H-shaped steel column 10a is used instead of the CFT column described above as a frame support column. The detachable support bracket 200 in which the shape of the crimping plate 220 is deformed in accordance with the cross-sectional shape of the H-shaped steel column 10a is well shown.

  Such a modification of the detachable support bracket 200 is generally the same as the structure described above, but the shape of the crimping plate 220 is changed to a vertical plate that can be joined to the outer plane of the H-shaped steel column 10a. At this time, the stopper means 15 is constructed by welding and installing two projecting plates 15a each having a predetermined thickness on the two outer planes of the section steel 10a one by one.

  Although the detachable support bracket 200 can be separated into both about the column 10, after the bolt 238 that fastens the two sub brackets 200a and 200b to each other is released, one of the sub brackets 200a is removed. The beam form can be disassembled by removing the lower sub-bracket 200b from the column 10 and lowering it while being supported by the suspension member 17, as shown in FIG.

  FIG. 14 shows the arrangement and lowering method of the support girders in a one-way slab (or one-way dex slab) unsupported formwork system, where reference numeral 300 denotes two adjacent detachable support brackets 200 supported by pillars 10. A plurality of support girders (applied with H-shaped steel) arranged side by side in a state where both ends are supported on the upper receiving plate 210 of the above, reference numeral 17S is a primary working suspension (Jacking Bar), Reference numeral 17N denotes a non-operating suspension.

  As shown in the figure, the beam formwork can be dismantled step by step by simultaneously lowering the sub-brackets 200a, 200b and the support beam 300 located in the down section with the CFT pillar 10 as the center.

  In addition, a part of the support beam 300 supported by the support brackets 100 and 200 of the first and second embodiments has a one-side end portion of the retaining wall 1 (for example, CIP Pile (Cast In Place Pile)). However, a separate support bracket for this purpose is shown in FIGS. 1 and 16 (b) to 18 (b).

  As shown in the figure, a support bracket 16 having an inverted triangular structure is fixedly installed on the inner side surface of the retaining wall 1 for each layer, and one end portion of the support beam 300 is supported on the support bracket 16. The opposite end of the spar 300 is supported on the support bracket 100 of the present invention as described above.

The support bracket 16 fixed to the earth retaining wall 1 can be installed by a welding method.
Hereinafter, a method for constructing an underground structure using the above-described downward frame placing system of the present invention will be described.

  First, as shown in FIG. 15, a retaining wall 1 (for example, composed of a CIP pile) is constructed around an outer wall of a site where an underground structure is to be constructed.

  Next, as shown in FIG. 16 (a), the pit 2 for installing the steel frame 10 for the building frame is drilled in the inner ground of the retaining wall 1, and the support column 10 for the frame is provided for each mine 2. Plant and fix.

  Here, when a CFT column is installed as the support column 10 for the frame, an upper pushing method in which concrete is pushed in from the upper part of the column using the filling pipe 12 can be used.

  That is, a circular steel pipe column 11 in which the filling pipe 12 is inserted long to the lower side of the inside is installed in each of the wells 2 which has been drilled vertically in advance, and then the shut-off installed on the outer surface of the steel pipe column 11 in the inside of the well 2 After filling the stone 11 (for example, crushed stone of 40 mm or more) on the plate 11a with primary and secondary, the base space 14 and the column under the barrier plate 13 are filled with a pump car through the upper end inlet of the filling pipe 12. Concrete is filled and placed.

  At this time, the concrete poured through the upper end inlet of the filling pipe 12 is filled in the foundation space 14 first, and then the inside of the steel pipe column 11 is filled from the bottom to the top.

  When the concrete is cured in this way, a concrete composite steel pipe column, that is, a CFT column 10 in which the steel tube column 11 is filled with concrete is completed, that is, the CFT column 10 is made of filled concrete due to the restraining effect of the steel pipe. High member strength and excellent deformation performance are exhibited by the strength improvement and the local buckling reinforcement effect of steel pipe by filled concrete.

  Therefore, when applied to a CFT column, it is possible to reduce the column cross-sectional area or increase the column interval, so that it is easy to secure an effective space, and column rigidity is higher than that of general structures such as H-section steel. Has the advantage of becoming larger.

  Next, after finishing the construction of the CFT pillar 10 as described above, the ground is excavated primarily as shown in FIG.

  Thereafter, the temporary structure of the present invention including the movable assembling support bracket 100 and the support beam 300 is fixedly installed on the CFT pillar 10 previously constructed, and the temporary structures 100 and 300 are used for building the stratum beams and slabs. To install a structure.

  That is, the stopper means 15 is first installed on each pillar 10, and each movable assembly type support bracket 100 is fixed on the corresponding pillar 10 according to the height of the beam and slab to be constructed, and the stopper means 15 is used. In addition to the support, another support bracket 16 is fixedly installed on the inner surface of the retaining wall 1, and then the support girders 300 between the peripheral columns 10 are appropriately arranged and supported on these brackets 100 and 16.

  Of course, the suspension member 17 is connected and fixed to the movable assembling support bracket 100 for lowering, and at this time, each suspension member 17 is shown as a sub-bracket (reference numerals 100a and 100b in FIG. 3A). ) And an upper receiving plate (denoted by reference numeral 110).

  Since the installation, assembly, and disassembly method of the support bracket 100 and the support girder 300 has been described in detail above while explaining the construction system of the present invention, the detailed description thereof is omitted in the description of the construction method. The arrangement state is also as described with reference to FIGS. 5 and 7A and FIGS.

  Here, a deformed reinforcing bar or a circular bar can be used as the suspension member 17, and the support girder 300 can be implemented by an H-section steel or a truss type steel beam.

  When installing the beam and slab construction structure, first, the beam form frame 19 including the beam side plate 19a, the bottom plate 19b, and the formwork support frame 19c is supported on the support beam 300 as the beam construction structure ( 19 (a) and 19 (b) and FIGS. 19 (c) and 19 (d)), a slab construction structure 20 (for example, a truss deck) is supported by the beam form frame 19 and installed.

  At this time, the beam side plate 19a uses an iron plate having a relatively thin thickness as compared with the beam bottom plate 19b. However, stud bolts 19d or reinforcing bar bars are provided on the inner surface of the beam side plate 19a so as to be inserted into the concrete to be placed thereafter. Install 19e after protruding and welding.

  As the reinforcing bar 19e, a bar-shaped one can be used, and both ends of the reinforcing bar 19e are welded and fixed to the inner side surface of the beam side plate 19a.

  In addition, a plywood can be used as the beam bottom plate 19b, and as the formwork support frame 19c, a structure in which a plurality of wood or BOX steel pipes are integrally assembled is used as usual.

  And as a structure for slab construction, it is possible to use a holly beam (manufactured by Japan Horry Co., Ltd.) well known to those skilled in the art as an unsupported horizontal support frame.

  When using a holly beam, after installing the beam form 19, install a holly beam on the beam form between each column, install a plywood on the holly beam, and then place concrete to build a slab .

  Also, long span (LS) formwork can be used as a structure for slab construction, and its use is increasing due to the advantages of non-supporting construction that can remove the formwork frame. Can be used.

  FIGS. 16B to 18B show an example in which a truss deck 20 is used as a slab construction structure.

  As is well known, the truss deck 20 is a product produced by integrating a truss structure iron wire structure having a high yield strength and a plurality of reinforcing bars for reinforcing the iron wire structure into a galvanized steel sheet, particularly a slab. It is a regular product that is structurally constructed inside the building concrete and assumes a structural role to some extent.

  Therefore, after placing the above truss deck 20 on the beam formwork 19 supported by the support beam 300 (applied with H-shaped steel) as a slab construction structure, when placing concrete in the subsequent steps, Deckslab can be constructed.

  Next, after installing the beam formwork 19 and the slab construction structure 20 as described above, as shown in FIG. 17 (a), concrete is cast to build the strata beam and slab structure, At the same time, excavation work for the construction of the structure on the first basement floor is performed below.

  Thereafter, stopper means 15 is newly installed on the circumferential surface of each pillar 10 in accordance with the height of the structure in the first layer of the basement, and another support bracket 16 is newly installed on the inner surface of the retaining wall 1. Perform preliminary work such as

  Next, after the concrete of the previously formed geological structure is cured to some extent, the bolts fastened between the sub-brackets are released, the movable assembly type support bracket 100 is disassembled from the pillar 10, and the suspension lowering device 18 is installed. After the support bracket 100 suspended by the suspension member 17 is lowered and the mold is removed from the mold, they are re-adjusted in the same manner as the formation in accordance with the height of the first basement as shown in FIG. 17 (b). Install.

  When the support bracket 100 is lowered, both the upper support girders 300 are lowered, but the beam formwork 19 and the slab construction structure (holly beam or long span formwork etc.) used above are placed below it. It can be lowered and reinstalled.

  Of course, when the truss deck 20 is used, it can be installed by the same method as described above.

  In the process of lowering the movable assembling support bracket 100 together with the support girder 300 after disassembly and re-installing the beams and slab construction structures 19 and 20 at the lower height, FIGS. As shown in detail in (c) and (d) (the support bracket on the lower side of the support beam is not shown), the beam side plate 19a is a stud bolt inserted and fixed inside the concrete of the upper beam (G) that has been previously constructed. 19d or the reinforcing bar 19e is fixed on the side surface of the upper beam (G), and the beam bottom plate 19b and the formwork support frame 19c are moved together when the support beam 300 is lowered so that the height of the lower beam Now re-install with a new beam side plate.

  In the present invention, the suspension member 17 is not used for supporting a concrete load as in the prior art, but is used only for simple boarding / alighting use of brackets and support girders.

  Therefore, in the present invention, a chain block (Chain Block) can be used in addition to using the suspension and descent device 18 illustrated in the drawing as the upper end of the suspension member.

  After installing the beam formwork 19 and the slab construction structure 20 as described above, concrete is cast as shown in FIG. 18 (a) to construct the first-floor beam and slab structure, At the same time, excavation work will be undertaken to build the structure on the second basement floor below.

  Next, the second basement floor and its underlying beams and slabs were constructed in the same manner, and after the last layer excavation work was performed as shown in FIG. The unfinished parts such as the Core and Ramp will be applied in order from the low level.

  Of course, the construction of the unfinished parts such as the wall, the core, and the lamp can proceed while the beam and slab construction of the lower layer is completed if the construction of the beam and slab construction of the corresponding layer is completed. Formwork and rebar work, and ground structure work can be performed simultaneously as well.

  20 (a) to 29 (b) show another embodiment of the movable assembly type support bracket fixedly supported by the frame support column, and the support column on which the support bracket 500 is supported. As the CFT column 10 or the H-shaped steel column 10a, the embodiment is applied differently depending on the frame support columns 10 and 10a on which the support bracket 500 is supported. It is the same.

  The support bracket 500 of the present invention is fixed to the support pillars 10 and 10a at a predetermined height according to the height of the layered beam and the slab, and the support beam 300 for supporting the formwork support frame on the support bracket 500. Is supported on the upper side thereof, and the support girder 300 comes to support a beam formwork and a structure for placing other slab concrete supported by the beam formwork.

  Further, when the construction of the slab is completed, the support bracket 500 is lowered along the support pillars 10 and 10a in order to perform a support function for construction of other slabs below the slab. This is made possible by the suspension material 17 for getting on and off which is fixed on the top.

  The support bracket 500 is positioned at a predetermined height on the support pillars 10 and 10a by stopper means protrudingly provided on the peripheral faces of the support pillars 10 and 10a in a state where the peripheral faces of the corresponding support pillars 10 and 10a are crimped. Is supposed to be fixed.

  Further, the support bracket 500 has a structure that can be disassembled from the support columns 10 and 10a, but the suspension material 17 is lowered by a suspension lowering device (not shown) in a state of being disassembled from the support columns 10 and 10a. In this case, the support bracket 500 is also lowered while the suspension member 17 is smoothly lowered below the slab via a sleeve provided on the slab around the beam.

  The structure of the support bracket of the present invention having such a function will be described in detail as follows.

  FIG. 20A is a plan view showing a square support bracket of the movable assembly type support bracket according to the embodiment of the present invention, and FIGS. 20B and 20C are a side view and a sectional view, respectively. FIG. 21A and FIG. 21B show a rectangular support bracket according to an embodiment of the present invention, and are perspective views seen from the upper side and the lower side, respectively. FIG. 22 shows a rectangular support bracket according to an embodiment of the present invention, and is a perspective view showing a state in which a support girder is arranged on the upper side.

  FIG. 23 is an exploded perspective view showing a state in which the rectangular support bracket according to the embodiment of the present invention is disassembled from the support column.

  Here, reference numerals 10 and 10a denote a CFT column and an H-shaped steel column filled with concrete, respectively, and reference numeral 300 denotes a support girder that is connected and arranged with other support columns in the vicinity.

  As shown in the drawings, the movable assembling support bracket 500 supports the support beam 300 from below, and is joined or divided along the corresponding joining (or dividing) surfaces so as to face each other. The pair of ring panels 520 and 530 located at the upper and lower parts of the center are arranged so that the peripheral surface of the support pillar 10 is located on the upper side in a state where the two subframes 510 are assembled with each other. And it is designed to be crimped simultaneously from below.

  More specifically, the movable assembling support bracket 500 includes a pair of “U” -shaped horizontal subframes 510 to which the suspension material 17 for getting on and off is fixed and which supports the ends of the support girders 300, The semicircular ring panels 520 and 530 that are arranged vertically at the center position of the coupled state and press the upper and lower outer surfaces of the support column 10 are connected to each other and the corners of the subframe 510 and the upper ring panel 520 are connected and supported. An upper vertical panel 540, an angle frame 560 that forms an inverted triangular support structure by connecting the lower ring panel 530 from the outer end of the upper vertical panel 540, and a lower ring panel 530 from the inner end of the upper vertical panel 540 The support frame 570 forming the vertical structure is configured as an integral structure.

  Also, another lower vertical panel 550 is installed on the lower ring panel 530, and the lower end of the corresponding angle frame 560 is fixed to each lower vertical panel 550. The structure is fixed to the vertical panel 540 and the lower end thereof is fixed to the corresponding lower vertical panel 550.

  At this time, the vertical cross section of the sub-frame 510 is in the form of an H-beam so that the bracket structure can fully withstand the load transmitted through the support beam 300 without deformation.

  The joining (or dividing) surfaces of the sub-frame 510 are formed so as to face each other in a form that does not interfere with the lower vertical panels 540 and 550 so that the joining and dividing of the sub-frame 510 are smooth. A fastening hole 511a is formed along the entire circumference of the rectangular joint surface 511, and a bolt or the like as a fastening means is fastened and fixed through the fastening hole 511a.

  Similarly to the subframe 510, the upper and lower ring panels 520 and 530 are also fastened by fastening bolts or the like as fastening means via fastening holes 521a and 531a formed in the joint surfaces 521 and 531 thereof. .

  When assembling the support bracket 500 to the support column 10, if the size of the support column 10 is not constant, filler plates 522 and 532 are added inside the ring panels 520 and 530, and the size of the support column 10 is related. The support bracket 500 can be easily used.

  However, if the size of the support column 10 is excessively large or small and the use of the filler plates 522, 532 is not possible, the main structural portion associated with the joining of the support bracket 500, ie, the upper vertical panel 540 and Only the angle frame 560 is manufactured separately, and the connection method of each main structure is configured by a connection method using fastening means such as bolts and nuts so that the angle frame 560 can be connected to the already manufactured support bracket 500 and used.

  The filler plates 522 and 532 are arranged at equal intervals around the CFT pillar 10, and upper protrusions 522 a and 532 a are fixed over the upper ends of the ring panels 520 and 530.

  Note that FIG. 28 shows a circular support bracket 600 that is another embodiment that is advantageous at the time of reinforcing the reinforcing bars of the SRC column because the internal space is wider than that of the square support bracket 500.

  Similar to the square support bracket 500, the circular support bracket 600 supports the support beam 300 from the lower side, and a pair joined or divided along corresponding joining (or dividing) surfaces so as to face each other. The circular subframe 610 has a joint surface formed so as to be opposed to each other within a range not to interfere with the lower vertical panels 640 and 650 so that the subframe 610 can be smoothly joined and divided. A fastening hole 611a is formed along the entire periphery of the rectangular joint surface 611, and a bolt as a fastening means is fastened and fixed through the fastening hole 611a.

  The other main configuration for supporting the CFT pillar 10 in the circular support bracket 600 is the same as the configuration of the square support bracket 500, and thus the description thereof is omitted in this specification.

  In addition, although it consists of the above-mentioned circular sub-frame 610, when the support column fixedly supported is not the circular CFT column 10 but the H-shaped steel column 10a, the support related part of the circular support bracket 600 is different. Formed.

  That is, the shape of the ring panels 620 and 630 of the circular support bracket 600 that is pressure-bonded and supported by the H-shaped steel column 10a is different, but FIG. 24A is a movable assembly type support according to the embodiment of the present invention. It is a top view which shows the circular support bracket of a bracket, FIG.24 (b) and (c) are a side view and sectional drawing, respectively. FIG. 25A and FIG. 25B show the circular support bracket according to the embodiment of the present invention, and are perspective views seen from the upper side and the lower side, respectively. FIG. 26 shows a circular support bracket according to an embodiment of the present invention, and is a perspective view showing a state in which a support girder is arranged on the upper side.

  FIG. 27 is an exploded perspective view showing a state in which the circular support bracket according to the embodiment of the present invention is disassembled from the support column.

  As shown in each drawing, in this embodiment, the H-column 10a to which the circular support bracket 600 is supported and fixed has a different structure of the support column so that it can cope with a lateral buckling phenomenon when a lateral load is applied. However, a pair of reinforced CT-sections 580 having a structure in which the H-section steel is cut in half is reinforced inside the portion where the support bracket 600 is supported and fixed to the outside.

  That is, a pair of reinforced CT-sections 580 are vertically erected in the empty space of the H-shaped steel column 10a, and the horizontal ends of the reinforced CT-sections 580 are in close contact with both side ends of the H-shaped steel column 10a. In this state, the H-shaped steel column 10a and the two reinforced CT-shaped steels 580 form a quadrangular cross-sectional structure, and thus the two reinforced CT-shaped steels 580 are subjected to a lateral load. The lateral buckling phenomenon can be prevented by filling the vacant space of the fragile H-shaped steel column 10a.

  In addition, in the circular support bracket 600 supported by fixing the ring panels 620 and 630 to the H-shaped steel column 10a having such a configuration, the ring panels 620 and 630 are formed in an “L” shape. In this structure, inclined joint surfaces 621 and 631 are formed at both ends.

  Fastening holes 621a and 631a are formed in the joint surfaces 621 and 631, and bolts or the like as fastening means are fastened and fixed through the fastening holes 621a and 631a.

  Further, similarly to the ring panels 520 and 530 of the square support bracket 500, filler plates 622 and 632 are added inside the ring panels 620 and 630 so that the support bracket 600 can be easily used regardless of the size of the support column 10a. It is supposed to be.

  In addition, the circular support bracket 600 supported and fixed to the H-shaped steel column 10a is more perpendicular to the horizontal plane of the H-shaped steel column 10a than the square support bracket 500 that is supported in the angular direction and structurally weak. Since it is supported, there is an advantage that the support details are structurally simple.

  FIGS. 29 (a) and 29 (b) are perspective views showing stopper means applicable to the square support bracket and the circular support bracket, and each of the subframes 510 and 610 is an assembly having a square shape or a circular shape. Stopper plates 590 and 690 serving as stopper means are provided around the support pillars 10 and 10a so that the support brackets 500 and 600 can be firmly fixed on the support pillars 10 and 10a. The stopper plate 710 having a thickness of 1 mm is welded and installed on the circumferential surface on the CFT column 10 at equal intervals, or is welded and installed on each circumferential surface on the H-shaped steel column 10a.

  The filler plate 720 that is installed immediately above the stopper plate 710 and extends while being inserted into the lower ring panels 530 and 630 has a slot groove in the left and right longitudinal directions on the filler plate 720. 721 is formed.

  The slot groove 721 is a portion to which a stopper puller 730 serving as a latching protrusion for supporting the support brackets 500 and 600 so as to be fixed to the support pillars 10 and 10a is attached. The distance between the upper and lower two slot grooves 721 is the same as the distance between the upper and lower two protrusions 731 such that the upper and lower slot grooves 721 are closely fixed in the inserted state. The stopper puller 730 between the grooves 721 is formed with at least one fastening hole 732 in the left-right length direction.

  At this time, the fastening hole 732 is formed through the support pillars 10 and 10a through the fastening holes 722 of the filler plate 720 so that the stopper puller 730 is supported in a state of being fixed to the slot groove 721 of the filler plate 720. The fastening bolt 742 can be fastened.

  Further, another fastening hole 733 having a diameter smaller than that of the fastening hole 732 is formed between the fastening holes 732 to which the fastening bolt 742 is fastened. The fastening hole 733 is formed only through to the filler plate 720 surface. The bolt 744 inserted into this has a fixed length so as to protrude.

  This is because the bolt 744 is rotated in a state in which the bolt 744 is fastened so that the stopper puller 730 is pushed rearward and can be easily removed from the slot groove 721. This is because the support brackets 500 and 600 can be easily lowered downward via 17.

  As a result, the movable assembly type support brackets 500 and 600 of the present invention form an inverted pyramid support structure as a whole in a state where the support columns 10 and 10a are assembled in the center, and on the peripheral surface of the support columns 10 and 10a. The support girder 300 is supported on the upper side in such a fixed state.

  Further, the subframes 510 and 610 that support the support beam 300 form a central opening 900 in a state where they are combined with each other, and a reinforcing bar can be arranged through the opening 900, and the support Since the periphery of the pillars 10 and 10a is in the form of the opening 900, the formwork and the reinforcing bar work of the reinforced concrete pillar are easy.

  Of course, the area of the opening 900 formed by the sub-frames 510 and 610 on both sides is larger than the cross-sectional area of the reinforced concrete column constructed by placing concrete after the reinforcement work around the support columns 10 and 10a. Of course.

  The movable assembly type support brackets 500 and 600 can be separated from each other along the bisection plane in directions corresponding to each other, but the bolts that fasten the two subframes 510 and 610 to each other are released. Thereafter, the entire support brackets 500 and 600 can be disassembled from the support columns 10 and 10a.

  After the upper layer beam and slab are constructed, the movable assembly brackets 500 and 600 are suspended and re-installed at the lower layer height to construct the lower layer beam and slab. A method may be used in which the support beam 300 is suspended and re-installed, and then the slab support beam is suspended and re-installed (see the description of FIG. 7B).

According to the bracket support type downward frame placing system and the downward frame placement method using the bracket support type according to the present embodiment, the concrete is placed on the beam and the slab formwork of the construction layer when the underground structure is constructed. In the meantime, the load of the concrete is not suspended and supported on the upper slab that has been previously constructed using a suspension material as in the prior art, but the movable assembly type support bracket that is fixedly supported by the support pillar for the frame, By using the support beam supported by the movable assembling support bracket and directly supporting the frame support column, it has the following advantages.
1) The present invention is a system in which a concrete load of a lower slab is supported by a column and can prevent an unreasonable load from being applied to the upper slab as in the prior art.
2) The suspension material in the present invention is not used for directly supporting a concrete load as in the prior art, but is used only for simple boarding / alighting use of brackets and support girders. The beam and slab can be constructed, and the lower layer can be constructed even before the concrete is completely cured. That is, the construction period can be greatly shortened.
3) Unlike the conventional suspension method, in which the slab formwork frame is supported and lowered by the suspension material, the beam and the slab construction structure are directly supported by the pillar, and the suspension material connection for simple boarding and unloading applications. Since the part is the bracket of the present invention that supports the structure, it is also advantageous for use in the Truss Deck whose use is increasing due to the advantage of unsupported construction that allows the removal of the formwork frame There is.
4) When the circular support bracket is supported and fixed to the H-shaped steel column, the reinforced CT-shaped steel is reinforced to the H-shaped steel column, so that lateral buckling can be prevented when a lateral load is applied.
5) Both the square and circular support brackets are installed so that the positions of the joint surfaces are not the support points of the brackets and are not interfered with the support points, so that split joining is easy.
6) The support bracket can be easily lowered downward using the stopper plate and the stopper puller.

The present invention is not limited to the description of the above embodiment.
Various modifications can be made without departing from the scope of the present invention.

  INDUSTRIAL APPLICABILITY The present invention can be applied to a downward frame placement system and a downward frame placement method using the same in the construction of an underground structure using the unsupported reverse placement method.

FIG. 1 is a utilization state diagram showing a bracket support type system according to an embodiment of the present invention. FIG. 2 is a plan view showing an assembly type support bracket according to an embodiment of the movable assembly type support bracket according to the embodiment of the present invention. FIG. 3A is a perspective view showing an assembly-type support bracket according to the embodiment of the present invention, and FIG. 3B is a cross-sectional view. FIG. 4 is a perspective view showing an assembly-type support bracket according to the embodiment of the present invention. FIG. 5 is a perspective view showing a column support state of the assembly type support bracket and the support beam according to the embodiment of the present invention. FIG. 6 is an enlarged perspective view showing a clamping state of the assembly type support bracket and the support beam according to the embodiment of the present invention. 7 (a) and 7 (b) are plan views showing a state in which the support beam of the present invention is arranged in the unsupported formwork system of the two-way slab according to the embodiment of the present invention. FIG. 8 is a perspective view showing the detachable support bracket according to the embodiment of the present invention. Fig.9 (a) is a perspective view which shows the detachable support bracket which concerns on embodiment of this invention, FIG.9 (b) is sectional drawing. FIG. 10 is a perspective view showing the detachable support bracket according to the embodiment of the present invention. FIG. 11 is a perspective view showing a column support state of the detachable support bracket and the support beam according to the embodiment of the present invention. FIG. 12 is a skeleton support column according to an embodiment of the present invention, and is a perspective view showing an attachable / detachable support bracket of the present invention that can be applied when an H-shaped steel is used and an attached state. FIG. 13 (a) is a skeleton support column according to an embodiment of the present invention, and is a perspective view showing a detachable support bracket of the present invention that can be applied when an H-section steel is used and an attached state. 13 (b) is a sectional view. FIG. 14 is a plan view showing a state in which the support beam of the present invention is arranged in the one-way slab unsupported formwork system according to the embodiment of the present invention. FIG. 15 is a process diagram for explaining the downward frame placing method according to the embodiment of the present invention. FIG. 16A and FIG. 16B are process diagrams for explaining the downward frame placing method according to the embodiment of the present invention. FIG. 17A and FIG. 17B are process diagrams for explaining the downward frame placing method according to the embodiment of the present invention. FIG. 18A and FIG. 18B are process diagrams for explaining the downward frame placing method according to the embodiment of the present invention. FIGS. 19A to 19D are views showing a state in which the beam form frame is supported by the support beam and a state in which the beam form frame is lowered in the frame placing process according to the embodiment of the present invention. FIG. 20A is a plan view showing a square support bracket of the movable assembly type support bracket according to the embodiment of the present invention, and FIG. 20B and FIG. 20C are a side view and a sectional view, respectively. FIG. 21A and FIG. 21B show the rectangular support bracket according to the embodiment of the present invention, and are perspective views seen from the upper side and the lower side, respectively. FIG. 22 shows a rectangular support bracket according to an embodiment of the present invention, and is a perspective view showing a state in which a support girder is arranged on the upper side. FIG. 23 is an exploded perspective view showing a state in which the rectangular support bracket according to the embodiment of the present invention is disassembled from the support column. FIG. 24 is a plan view showing a circular assembly bracket of the movable assembly type support bracket according to the embodiment of the present invention, and FIGS. 24B and 24C are a side view and a sectional view, respectively. FIG. 25A and FIG. 25B show the circular support bracket according to the embodiment of the present invention, and are perspective views seen from the upper side and the lower side, respectively. FIG. 26 shows a circular support bracket according to an embodiment of the present invention, and is a perspective view showing a state in which a support girder is arranged on the upper side. FIG. 27 is an exploded perspective view showing a state where the circular support bracket according to the embodiment of the present invention is disassembled from the support column. FIG. 28 is a plan view showing another embodiment of the circular support bracket according to the embodiment of the present invention. 29 (a) and 29 (b) are perspective views showing stopper means applicable to the support brackets of FIGS.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Earth retaining wall 10 ... CFT pillar 15 ... Stopper means 15a ... Projection plate 16 ... Support bracket 17 ... Suspension material 18 ... Suspension descent apparatus,
19 ... Beam formwork 20 ... Truss Deck
21 ... Holly Beam
DESCRIPTION OF SYMBOLS 100 ... Assembly type support bracket 100a, 100b ... Sub bracket 110 ... Upper receiving plate 122, 124 ... Semi-circular pressure bonding plate 126 ... Lower vertical plate
DESCRIPTION OF SYMBOLS 130 ... Upper vertical board 140 ... Support frame 200 ... Detachable support bracket 200a, 200b ... Sub bracket 210 ... Upper receiving plate 220 ... Crimping plate 230 ... Side plate 232 ... Bolt fastening part 234 ... Fastening hole 236 ... Notch groove 240 ... Bottom plate

Claims (8)

A retaining wall, a plurality of frame support columns vertically anchored in the inner ground, a beam and slab building structure including a formwork, and means for supporting the beam and slab building structure In the downward framework placement system for construction of underground structures,
Means for supporting the beam and slab building structure,
Each column is constructed with a structure that can be separated and combined with each other around the corresponding column, and is coupled to the height of the corresponding layer to be constructed and fixedly supported by each column. Movable assembly type support bracket that can be moved in position,
A supporting girder that is horizontally connected between the two adjacent pillars and that supports both the beam and the slab building structure on the upper side while both ends are supported by the movable assembly support brackets. seen including,
The movable assembly support bracket is
The suspension material for getting on and off is fixed and fixed to the support column so as to support the support girder from the lower side, and is joined or divided along the joining or dividing surface. A pair of subframes correspondingly formed to face each other in a form not interfering with the upper vertical panel and the lower vertical panel so that the
An upper ring panel and a lower ring panel, which are respectively arranged vertically at the center position of the coupled state and crimp the upper and lower outer surfaces of the support pillar;
An upper vertical panel for connecting and supporting each inner surface of the sub-frame and the upper ring panel;
An angle frame that connects the lower ring panel at the outer edge of the upper vertical panel to form an inverted triangular support structure;
A support frame forming a vertical structure connecting the lower ring panel at an inner end of the upper vertical panel;
Bracket support type downward frame placing system characterized by being constructed as an integral structure . The subframe, the bracket support type according to claim 1, characterized in that it has a circular or rectangular structure at different positions of the inside of the upper vertical panel and a lower vertical panels the angle frame is supported Downward frame placing system. When the size of the support column is not constant, a filler plate is attached between the support column and the upper ring panel and the lower ring panel so that the support bracket can be easily used regardless of the size of the support column. The bracket support type downward frame driving system according to claim 1, wherein If the size of the support pillar is excessively large or small and the filler plate cannot be used, only the upper vertical panel and angle frame, which are the main structural parts related to joining of the support bracket, are separately manufactured. , concatenation of the primary structure as already available linked to fabricated support bracket downward brackets supporting type according to claim 1, characterized by being configured in a bonding method via the fastening means Frame placing system. Stopper means are separately attached around the support column and on the filler plate so that the vertical position is fixed while protruding and fixed on the outer surface of the support column and the entire support bracket is hooked downward. The bracket support type downward framework driving system according to claim 1 . The stopper means includes
A stopper plate that is welded and installed at equal intervals on the peripheral surface of a CFT (Concrete Filled Steel Tube) column, or welded and installed on each peripheral surface of an H-shaped steel column;
Slot grooves are respectively formed in the left and right length directions on the upper and lower portions of the filler plate that is installed immediately above the stopper plate and extends while being inserted into the upper ring panel and the lower ring panel. The groove interval is formed to be the same as the interval between the projecting portions so that the upper projecting portion and the lower projecting portion are inserted and fixed into the slot groove, and the front portion is formed to penetrate to the support column surface. A fastening hole is formed to be coupled with the fastening hole of the filler plate, and the bolt is rotated in a state where a bolt protruding at a certain length is fastened between the fastening hole to which the bolt is fastened. A stopper puller in which a fastening hole is formed to penetrate the slot groove so that it can be easily removed from the slot groove.
The bracket support type downward framework driving system according to claim 5, wherein The H-shaped steel column has a pair of reinforced CT-s in which the H-shaped steel column is cut in half inside the portion where the support bracket is supported and fixed to the outside so as to cope with the lateral buckling phenomenon when a lateral load is applied. The bracket support type downward frame driving system according to claim 6, wherein the shape steels are reinforced corresponding to each other. In the downward framework placing method in which underground structures including beams and slabs are constructed from the ground floor to the underground layer,
The process of constructing a retaining wall and constructing a supporting column for a frame in the inner ground,
A step of fixing and installing stopper means and a support bracket on the outer surface of each column and the inner surface of the retaining wall after ground excavation,
A step of crimping and assembling a movable assembly type support bracket on each column according to the height of the beam and slab, and fixing and supporting by the stopper means;
Horizontally supporting a support girder, which is a length steel material, between two adjacent columns and between the column and the retaining wall in such a manner that an end portion is supported on the movable assembly type supporting bracket and the retaining bracket of the retaining wall; ,
A step of supporting the beam and slab building structure on the support beam and installing the structure;
Placing and curing concrete for beams and slabs, excavating the lower ground, and installing the stopper means on the pillar and the support bracket of the retaining wall in the same way at the height of the lower layer;
After the concrete has been cured to a certain level, move the movable assembly support bracket and support girder to the lower layer height and reinstall them in the same way, and then re-install the beam and slab building structure at the lower layer height. The process of placing and curing concrete;
And a step of constructing an underground structure below that by repeating the steps described above.

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