KR20140008067A - Low depth tunnel construction method using variable mould system - Google Patents

Abstract

Disclosed is a low depth tunnel structure using a variable system mold capable of rapidly constructing a tunnel structure by constructing the upper part of the low depth tunnel using an inner system mold, an upper side wall part, and a ceiling outer mold after the ground is excavated in order to construct a low depth tunnel, a temporary construction is installed using an earth retaining wall, a variable system mold is moved, and the lower part of the low depth tunnel is continuously constructed. [Reference numerals] (AA) Span; (BB) Lengthwise direction; (CC,FF) Moving; (DD) Ascending; (EE) Concrete placing/curing; (GG) Descending; (HH) Continuous concrete placing/curing

Description

TECHNICAL FIELD [0001] The present invention relates to a method of constructing a low deep tunnel structure using a variable system form,

The present invention relates to a method of constructing a low depth tunnel structure using a variable system form. More particularly, the present invention relates to a method of constructing a low deep tunnel structure using a deformable system form capable of rapidly constructing a tunnel structure after securing a low depth tunnel space by excavating the ground with low depth.

FIG. 1A is a sectional view of a conventional box structure installed in the ground. FIG.

The box structure 10 is installed to extend in the longitudinal direction, for example, in the case of constructing an underground roadway.

Since the box structure 10 must be installed in the underground of a road or the like, the road can not be controlled indefinitely. Therefore, it is necessary to secure a space for installing the box structure 10, .

For this purpose, in order to secure the inner space of the box structure 10, a plurality of piles 31 are spaced in the lateral direction so as to be spaced apart in the longitudinal direction.

In this file, a wale is provided in the longitudinal direction, and a soil plate not shown is installed between the longitudinally spaced files 31 to form a kind of soil wall, so that the inner space formed by the later- G1 are collapsed and not introduced.

The earth wall is provided with a plurality of earth anchors 40 extending downward toward the surrounding ground so as to effectively resist earth pressure.

Thus, the two tortuous walls are separated from each other.

The inner space S1 is secured while continuing downward from the surface of the earth. The upper transverse strut 51 is installed so that the upper plate 20 can be placed on the upper part of the inner space when the waveguide advances to some extent.

This upper lateral strut 51 mainly uses H-shaped steel which is installed in a large number in the longitudinal direction.

At this time, if the length of the transverse extension of the upper lateral strut 51 becomes long, it is impossible to resist all the loads transmitted from the ladder plate 20, so that the intermediate file 32 and the intermediate file 32 And 33 are provided with intermediate lateral struts 52.

The intermediate pile 32 can securely support the louver 20 even if the transverse extension length of the upper transverse strut 51 and the intermediate transverse strut 52 is increased.

At this time, the file, wale, and lateral strut are also referred to as hypotheticals.

In order to install the box structure 10, a box structure not shown is installed, a large amount of reinforcing steel assembly is disposed in the mold, and a concrete structure is installed by concrete pouring operation.

However, it takes too much effort and time to install the box structure in the inner space, which is buried in the ground, in the conventional method of casting the concrete using the formwork in the field.

In other words, since the amount of concrete that can be pushed once in the longitudinal direction (one span) is limited, if the tunnel structure is installed while the formwork is additionally installed, there is a problem that the air for constructing the tunnel structure in the longitudinal direction is too long And the operation of the system form which can solve it is very important.

Furthermore, the width of the tunnel structure can be various, and if it is necessary to separately install the formwork in each case, it would be an excessive cost and air delay factor for the installation and disassembly of the formwork.

In addition, the intermediate transverse strut 52 installed in the intermediate piles 32 and 33 is installed for structural stability, but has a problem in that the workability is deteriorated due to interference with the actual box structure 10 during construction.

As shown in FIGS. 1B and 1C, since the box structure is formed in the inner space by extending the box structure in the longitudinal direction, it is possible to install the box structure more easily and quickly, thereby improving the workability, The construction method of the structure has been introduced.

In other words, the box structure can be quickly installed using the precast box structure without the construction of the cast-in-place concrete and the formwork. To this end, the precast box structure is successively installed while sliding a plurality of segment box structures in the longitudinal direction And,

The bottom plate 61 constituting the segment box structure and the precast wall segment 62 are first installed,

A precast upper segment 63 connected between upper portions of the precast wall segment 62 is fabricated to be in contact with each other in the longitudinal direction and the concrete and the upper concrete 64 are placed and cured So that the top plate portion of the final box structure can be formed.

However, there is a limit in constructing all the box structures having various lateral widths in the precast method in the whole construction of the box structure by the precast method,

In particular, in order to securely assure the structural integrity of the precast upper segment 63 connected to the plurality of precast wall segments 62 installed longitudinally (in the longitudinal direction), the method using the cast concrete is most conservative and effective However, there is a problem in that the advantages of the precast construction method can not be avoided unless the above-mentioned on-site concrete pouring work is more efficiently applied.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a low depth tunnel which can be safely and rapidly extended in a desired length (longitudinal direction or longitudinal direction).

That is, the technical object of the present invention is to provide a method of constructing a low-depth tunnel structure in which a tunnel structure is divided into an upper part and a lower part so that the lower part and the upper part can be quickly constructed using the system form regardless of the lateral width.

Also, it is a technical object to provide a low-depth tunnel structure construction method capable of easily moving a system form in a longitudinal direction while allowing both side walls and a bottom plate to be efficiently installed according to the lateral width of a tunnel structure .

Accordingly,

It is possible to provide a variable system dock that can be easily moved in the longitudinal direction while allowing the side walls and the bottom plate to be installed more efficiently according to the lateral width of the tunnel structure.

In addition, the variable system formwork is used for constructing the lower depth tunnel first, and when the lower part of the tunnel structure is finished to a certain length on the lower depth tunnel, the inner system formwork, the upper side wall part, The tunnel structure can be completed together with the tuning system formwork.

To this end,

First, the excavation for constructing the low depth tunnel is carried out by using the earth wall, and the bottom of the low depth tunnel is completed with the cast concrete by using the variable system form. When the bottom of the low depth tunnel is completed, the variable system form is moved and the low depth tunnel is continuously installed.

Next, when the bottom of the low depth tunnel is completed to a certain length, the upper part of the low depth tunnel is constructed using the inner system formwork, the upper side wall part and the ceiling outer formwork.

At this time, the inner system formwork is installed under the low-depth tunnel installed in the construction, and the upper part of the low-depth tunnel is continuously installed while moving in the longitudinal direction.

To this end,

In the method of constructing a tunnel structure including a bottom plate, a lower portion of the tunnel including both sidewalls and the upper portion of the tunnel, an inner space formed by excavating between piles after installing a plurality of piles in the ground by longitudinally spaced piles Installing a lateral strut between the pile and the pile to install a temporary facility; Installing a variable system formwork in order to construct the bottom plate and both sidewall portions in the inner space using site-cast concrete and constructing a lower part of the tunnel by pouring concrete; And installing the inner system formwork on the bottom plate of the completed tunnel and placing concrete to integrate the upper part of the tunnel with the lower part of the tunnel.

The variable system formwork is formed by hinge-connected to the side of the formwork box frame is supported by the inner space formwork setting means for setting the position of the closing plate of the formwork panel; A formwork placing means hinged to a side of the formwork box frame so as to demould the closing plate from both of the cured sidewalls and the bottom plate; and a formwork placing means inside the formwork box formwork of the variable formwork placing means. A longitudinal beam formed on upper and lower surfaces of the rail so as to be slidably moved in the longitudinal direction along the roller installed in the installed roller fixing frame; And a formwork moving means including a front frame and a rear frame formed at both ends of the longitudinal beam to be supported in the inner space.

According to the present invention, it is possible to construct a low-depth tunnel quickly and economically corresponding to a transverse extension length in a low-depth tunnel.

In addition, it is possible to fundamentally secure the structural integrity of the tunnel structure by effectively utilizing the system formwork using the method of casting the spotted concrete.

An embodiment of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art will be able to modify the technical idea of the present invention in various forms. Accordingly, such improvements and modifications are within the scope of the present invention as long as they are obvious to those skilled in the art.

FIG. 1A is a construction cross-sectional view of a conventional box structure installed in the ground,
FIGS. 1B and 1C illustrate the construction of an underground box structure by a conventional precast method,
FIG. 2A and FIG. 2B are sectional views of a lower depth tunnel under construction according to the present invention,
FIGS. 3A, 3B, 3C, and 3D are diagrams illustrating a movement sequence of a variable system formwork for a low-depth tunnel under construction according to the present invention.
Fig. 4 is a view showing the installation of the movable form pouring means and the form moving means according to the present invention;
5 is a top cross-sectional view of a low depth tunnel according to the present invention,
6 is a completed perspective view of a low depth tunnel according to the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which: Are not limited to the embodiments described below.

[Lower construction of low depth tunnel]

First, as shown in FIG. 2A, ground excavation is performed for low depth tunnel construction. The meaning of the low depth tunnel is the construction of the tunnel structure which is constructed at low depth (roughly 10 ~ 15m) rather than deep from the earth surface to the ground.

Generally, in urban areas, there is a lot of obstacles on the roads and the amount of traffic is heavy. Therefore, construction period and construction cost are inevitably required in order to construct the tunnels.

In other words, it takes a lot of time and cost to construct excavation and earth wall for high-altitude tunnel construction, and it takes some time traffic control to construct it.

A way to solve this is to safely and quickly complete the excavation and erosion studies and minimize traffic control within a short period of time.

Therefore, the tunnel construction should be minimized and the tunnel structure should be installed more quickly.

Of course, if the tunnel structure is constructed by the precast method, it is possible to construct the tunnel structure at the earliest time. However, considering the lateral width and considering various tunnel shapes, it is difficult to construct all the tunnel structures by precast method, There is no other way.

In order to solve this problem, the present invention is applied to the lower and upper low-depth tunnel bases 100 and 200 extending in the longitudinal direction (longitudinal direction) with substantially the same cross-section, using the casting system.

In other words, it may take a long time to work on site in comparison with the case where it is installed quickly by the precast method. However, it is possible to overcome the disadvantage of the method of constructing a concrete structure by using a system form which can overcome the delay of the field work will be.

First, as shown in FIG. 2A, the ground G for low-depth tunnel construction is excavated. In this excavation, the piles (P) are first installed in a spaced apart relation in the longitudinal direction, and a plurality of piles are spaced apart in the longitudinal direction, and a wale (wale) W and a turntable (not shown) In order to prevent collapse due to excavation of the ground, a temporary installation is first performed to form an inner space in which a tunnel structure can be installed.

Thus, wales (wales) are installed in the longitudinal direction of the pile, and a plurality of lateral struts are installed between the wale and the wale through the upper portion and the lower portion.

It can be seen that the upper lateral strut 51 and the intermediate lateral strut 52 are formed although the number of installations can be varied according to the depth of the present invention.

First, a variable system form 400 is installed to construct the low depth tunnel bottom portion 100.

That is, the variable system form 400 is a system form for constructing the bottom plate 110 and the side wall portions 120 constituting the lower depth tunnel lower portion 100, and is continuously moved in the longitudinal direction (longitudinal direction) It can be said that it is for continuously constructing the tunnel lower part 100.

Hereinafter, the members having a form function will be referred to as variable form pouring means 410, and the means for moving will be referred to as form moving means 420.

2A and 2B will be described with reference to the variable shape pouring means 410. FIG.

The variable form die pouring means 410 means that the bottom plate 110 and the side wall portions 120 can be constructed while accommodating the lateral widths variably.

For this, the variable die pouring means 410 includes a form box frame 411, a form setting means 412, a form dispensing means 413 and a finish plate 414 as shown in FIG.

First, the mold box frame 411 is formed as a box frame having a predetermined length in which the square frames are arranged so as to be spaced apart from each other in the longitudinal direction by assembling the H-shaped beams, .

The self-supporting of the formwork box frame 411 can be maintained by the lifting means 411c including hydraulic jacks installed on both side lower portions of the front frame 411a and the rear frame 411b.

The finish plate 414 is connected to the form box frame 411 by the form setting means 412. In other words, the position of the finishing plate 414 can be adjusted according to the lateral width and the thickness of the bottom plate by the form setting means 412 and the form dispensing means 413.

Accordingly, even if the size of the formwork box frame 411 does not change, the length of the form setting means 412 and the form dispensing means 413 are adjusted to match the forming positions of both side wall portions and the bottom plate, As shown in FIG.

The present invention can reduce the lateral distance from the lateral side of the formwork box frame 411 to the finished plate 414 according to the lateral width of various low-depth tunnels, specifically the distance between the side walls, (142, 143).

For example, the worker inserts one end of a jack bolt 412c fastened by a fastening nut 412b into a hollow tube-shaped housing 412a constituting a form setting means 412 for a side wall portion to a finishing plate 414a for both side wall portions The jack bolt 412c is inserted into the housing 412a using the rotation of the coupling nut 412b while the other end is hinged to the side of the molding box frame 411, So that the setting position of the finishing plate 414a for both side wall portions can be adjusted.

The mold releasing means 413 for the side wall part also hinges one end of the hydraulic jack 413c mounted on the hollow pipe type housing 413a to the closing plate 414a for both side walls and the other end is connected to the mold box frame 411 The hydraulic jack 413c is inserted into the housing 413a through the extension of the hydraulic jack 413c and the length of the form dispensing means 413 is adjusted to adjust the setting position of the finish plate 414a for both side walls 413a And demoulding can be adjusted.

Further, the upper and lower distances from the lower part of the form box 411 to the finishing plate 414 can be accommodated by adjusting the lengths of the form setting and disassembling means 412 and 413 according to the thickness of the bottom plate 110 of various low- .

For example, the operator inserts the lower end of the jack bolt 412c fastened by the fastening nut 412b into the hollow tube type housing 412a constituting the form plate setting means 412 for the bottom plate, And the jack bolt 412c is inserted into the housing 412a using the rotation of the clamping nut 412b while the upper end of the hook bolt 412b is hinged to the bottom of the formwork box frame 411, So that the setting position of the bottom plate finishing plate 414b can be adjusted by adjusting the length.

The form setting means 412 for the bottom plate is installed in a part of the frame of the whole formwork frame 411 as shown in FIG.

The bottom plate demolding means 413 for the bottom plate also hinges the lower end of the hydraulic jack 413c mounted on the housing 413a of the hollow tube type to the bottom plate finishing plate 414b, The hydraulic jack 413c is inserted into the housing 413a through the extension of the hydraulic jack 413c while being hinged to both sides and the length of the form releasing means 413 for the bottom plate is adjusted to adjust the length of the bottom plate finishing plate 414b And demoulding can be adjusted.

The finishing plate 414 may be a form panel provided to form the bottom plate 110 and the side walls 120 under the low depth tunnel. The finishing plate 414a for both side walls, the finishing plate for the bottom plate 414b and a lower edge connecting portion 414c.

That is, it can be seen that the finishing plate 414a for the side wall part is located on both sides of the formwork box frame 411 so as to be set on the inner side of the both side wall parts 120, (412, 413).

It can also be seen that the bottom plate finishing plate 414b is spaced apart from the lower portion of the formwork box frame 411 in order to be placed on the top surface of the bottom plate 110 and is also provided with the bottom plate setting and demolding means 412, It can be seen that the hinge is connected.

It is also understood that the lower edge connecting portion 414c is formed by a hinge structure or a hinge structure so that the lower portion of the end plate for both side wall portions 414a and the both end portions of the bottom plate finish plate 414b are connected to each other, have.

2A, by the extension of the form setting means 412 connected to the formwork box frame 411 and the form dispensing means 413, a finishing plate 414 for placing both side wall portions and the bottom plate concrete is disposed at a planned position And it is understood that concrete can be installed between the outer finishing plate 415 and the both side plates 416 for the bottom plate at a position spaced apart from the finishing plate 414 so that the side wall and the bottom plate can be installed .

At this time, the outer finishing plate 415 may be supported by the wale W of the pile P so that the outer finishing plate 415 has a length extending in the longitudinal direction of the span.

When such concrete pouring and curing is completed,

2b, the mold setting means 412 connected to the formwork box frame 411 and the form dispensing means 413 are reduced in length to form a bottom plate 414 on which both side wall portions and the bottom plate concrete are placed, And both side wall portions are folded and set.

It will be appreciated that the form setting means 412 is primarily responsible for setting the position of the finish plate 414 and the form dispensing means 413 is primarily responsible for the demoulding of the finish plate 414. [ This is because the weight of the finishing plate 414 is large, so that the form demolding means 413 using the hydraulic jack is advantageous for the demolding of the finishing plate.

After the bottom plate and both sidewall portions of the one span are installed in the longitudinal direction as described above, the variable shape pouring means 410 must be moved in the longitudinal direction.

The formwork moving means 420 is formed so that the variable formwork placing means 410 is supported to slide while sliding in the longitudinal direction for this purpose, the longitudinal direction between the front and back of the front frame (421a) and rear frame (421b) End of the longitudinal beams 423 constrained by the transverse connecting member 422 spaced apart from each other in the transverse direction so as to be connected to

It can be seen that the longitudinal beams are positioned so as to pass through the inside of the rectangular box frame 411 of the variable form dipping means 410 as seen in the longitudinal direction.

In this case, both lower sides of the front frame 421a and the rear frame 421b may be maintained by lifting means 421c including a hydraulic jack.

At this time, it can be seen that the rail 424 is extended in the longitudinal direction on the upper surface and the lower surface of each longitudinal beam 423, specifically, the upper and lower flanges of the longitudinal beam and the bottom surface.

The rollers 426 mounted at positions corresponding to the positions of the rails 424 are installed on the roller fixing frame 425 provided on the inner side of the rectangular box frame 411 in the rail 424,

It can be seen that longitudinal beams 423 are formed between the front frame 421a and the rear frame 421b set by the elevating means 421c, and the rail 424 is provided on the longitudinal beam 423. ) Is installed,

The movable form pouring means 410 is supported on the rail 424 and is slid so that the movable form pouring means 410 can be moved in the longitudinal direction.

FIG. 3 shows an example in which the movable form pouring means 410 is supported on the form moving means 420 and moves while sliding in the longitudinal direction.

First, according to FIG. 3, the front frame 421a and the rear frame 421b of the formwork moving means 420 are set by the elevating means 421c in the bottom plate 110 and the side wall portions that are pre-installed. It can be seen that the 420 is supported by the inner space and installed freely.

Next, the variable formwork placing means 410, in which the roller fixing frame 425 with rollers mounted on the rail installed in the longitudinal beam of the formwork moving means 420, is installed and supported on the inner side thereof, forms a front surface of the formwork box frame. It can be seen that the lift means 411c and the rear frame 411b are set at the position for one-span concrete placing by the elevating means 411c provided on both lower sides of the frame 411b.

As a result, it can be seen that the extension length of the formwork moving means 420 is set to extend longer than the extension length of the variable formwork system 410 based on the longitudinal extension length.

When the variable formwork system 410 is set, the concrete for both side walls and the bottom plate is laid and cured.

Next, the elevating means 411c of the variable formwork system 410 is raised, and the finishing plate 414 is demolded from the side wall and the bottom plate cured by the formwork setting means 412 and the formwork shaping means 413. In addition, the variable formwork system 410 slides along the rail 424 of the formwork moving means 420 by the roller 425 to be moved in the longitudinal direction.

When the variable formwork system 410 is positioned at a desired position, the elevating means 411c of the variable formwork system 410 is lowered.

Next, after elevating the lifting means (421c) provided in the front frame (421a) and the rear frame (421b) of the form moving means 420 to move the form moving means (420) in the longitudinal direction,

The elevating means 421c is lowered to set the form moving means 420 to the new position again and the finish plate is set at a desired position by using the form setting means 412 and the form releasing means 413, .

That is, while moving the form moving means 420 of the present invention by one span in the longitudinal direction, the variable formwork system 410 is also moved in the longitudinal direction by one span, and the both side wall portions and the bottom plate are successively constructed It can be seen that the lower part of the tunnel is constructed.

[Upper Construction of Low Depth Tunnel]

As described above, when the lower depth tunnel 100 is completed, both side walls and the bottom plate are constructed.

It can be seen that the piles and the lateral struts 51 and 52 installed to excavate the bottom plate for the sidewall portion and the pile construction are installed. In this state, while the intermediate lateral strut 52 is removed, A stiffener 130 is provided between the stiffeners 130 and the piles to serve as an intermediate transverse strut and prevent interference from occurring in the lower depth tunnel construction by the intermediate transverse struts 52.

As shown in FIG. 5, the upper sidewall part and the ceiling outer mold part 320, which extend upward along the upper end outer surface of the side wall part 120, are first installed to be supported by the pile P and the wale W.

Next, a bottom plate rail 160 is installed on the upper surface of the completed bottom plate 110 so that the inner system form 310 is slid and can move in the longitudinal direction.

So that the inner system form 310 moves along the rail 160 by one span in the longitudinal direction so that the lower depth tunnel upper portion 200 having a desired shape and lateral width can be constructed.

Since the inner system form 310 is moved in the longitudinal direction when the initial installation is completed, when the concrete curing placed between the inner system form 310 and the upper sidewall part and the ceiling outer form 320 is completed, Lt; / RTI >

The inner system formwork and upper sidewall portions and ceiling outer molds 310 and 320 may have various shapes depending on the shape of the low depth tunnel upper portion 200. In other words, it is a system form that is made considering lateral width and shape.

For example, the inner system form 310 includes a vertical support member 311 having rollers formed therebelow so as to move along the rails 160 provided on the bottom plate 110, and a ceiling bottom surface 310 connected to the upper portion of the vertical support member 311. [ And a sidewall inner mold support member 313 for the sidewall portions 120 provided on the lower and lateral sides of the ceiling bottom mold support member 312 and the vertical support member 311, Are spaced apart from each other in the longitudinal direction, and are connected to each other and moved by one span.

When the upper portion of the final low-depth tunnel is completed, the rail 160 is removed, and the inner system mold 310, the upper sidewall portion, and the ceiling outer mold 320 are removed.

As shown in FIG. 6, when the system form is dismantled, when a lateral strut and a flat plate installed on the upper part are installed, it is removed to perform a covering operation so that the tunnel structure can be buried in the ground. A sleeping rail, and a rail.

100: lower depth tunnel bottom
110: bottom plate
120:
130: Supporting stiffener
160: Bottom rail
200: Low depth tunnel top
310: inner system die
311: Inner vertical support member
312: ceiling bottom form support member
313: side wall inner form support member
320: upper side wall portion and ceiling outer mold
400: Variable System Formwork
410: Variable form pouring means
411: formwork box 412: formwork setting means
413: die demolding means 414: finishing plate
414a: Finishing plate for both side walls 414b: Finishing plate for bottom plate
414c: Lower corner connection
420: Form moving means
421a: front frame 421b: rear frame
422: transverse connector
423: longitudinal beam
424: Rail
425: Roller fixture
426: rail

Claims (10)

A method for constructing a tunnel structure comprising a lower part of a tunnel including a bottom plate and both side walls, and an upper part of the tunnel, comprising the steps of: installing a plurality of files in the longitudinal direction in spaced- Installing a transverse strut between the file and the file to establish a hypothetical structure; Installing a variable system form (400) in the inner space to construct a bottom plate and both sidewall portions using field-cast concrete, and constructing a lower portion of the tunnel by pouring concrete; And installing an inner system formwork (310) on a bottom plate of the completed tunnel and installing concrete by placing the upper part of the tunnel with the lower part of the tunnel,
The variable system form 400 includes a form setting means 412 hinged to a side of a form box frame 411 supported by an inner space to set a position of a finish panel 414, which is a form panel; And a form demoulding means (413) hinged to a side of the mold box mold so that the finish plate can be demolded from the cured both side wall portions and the bottom plate, and a deformable mold putting means (410) A longitudinal beam 423 formed on the upper and lower surfaces of the rail 424 so as to be slidable in the longitudinal direction along the roller 426 provided on the roller fixing frame 425 provided on the inner side of the form box frame; And formwork moving means 420, which are installed at both ends of the longitudinal beam and supported to support the inner space. A low-depth tunnel structure construction method using a variable system formwork, characterized in that the variable formwork means 410 is formed to move in the longitudinal direction along the formwork moving means by (420). According to claim 1, wherein the formwork box 411
Assembling the H-shaped steel and arranged so that the rectangular frame is spaced apart in the longitudinal direction, and formed in the form of a box frame having a predetermined length connecting the rectangular frame with the longitudinal connection steel, the front frame (411a) and the rear frame (411b) Low-depth tunnel structure construction method using a variable system formwork, characterized in that supported by the elevating means (411c) including the hydraulic jacks installed on both side lower portions of the inner space. The method of claim 1,
The die moving means 420
It is supported by the lifting means (421c) including the hydraulic jacks installed on both lower sides of the front frame (421a) and the rear frame (421b) to be self-supporting in the inner space,
The rail 424 extends longitudinally in the upper and lower flanges of the longitudinal beam 423,
The rollers 426 mounted at positions corresponding to the positions of the rails 424 are installed in the roller fixing frame 425 provided on the inner side of the rectangular box frame 411 in the rail 424, Wherein the variable form dipping means (410) is supported and slid in the longitudinal direction so that the variable dumping means (410) can be moved in the longitudinal direction. 3. The apparatus of claim 1, wherein the finishing plate (414)
A finishing plate 414a for both side wall portions for constructing both side wall portions;
A bottom plate finish plate 414b for bottom plate construction; And
And a lower edge connecting portion (414c) for hinging the lower ends of the finishing plate for both side wall portions and the both side ends of the bottom plate finishing plate to each other, and being demolded while being folded by the form demoulding means. Construction method of low depth tunnel structure using. 5. The method of claim 4,
The finishing plate 414a for the side walls and the finishing plate 414b for the bottom plate are connected to the form setting means 412 and the form dispensing means 413,
The die setting means 412 has a structure in which one end of a jack bolt 412c fastened by a fastening nut 412b to a hollow tube type housing 412a is hinged to a finishing plate 414a for both side wall portions, The jack bolt 412c is inserted into the housing 412a using the rotation of the coupling nut 412b while the hinge is connected to the side of the molding box frame 411, And the setting position of the bottom deadening plate (414a) can be adjusted. The apparatus as claimed in claim 5, wherein the form demoulding means (413) comprises a hydraulic jack (413c) mounted on a hollow tube-shaped housing (413a) with one end hinged to a closing plate (414a) for both side walls, The hydraulic jack 413c is inserted into the housing 413a through the extension of the hydraulic jack 413c while the hinge is connected to the side of the frame 411 and the finishing plate for both side walls 414a) to adjust the setting position and demolding. 41. A method of constructing a low depth tunnel structure using a variable system form. 6. The apparatus of claim 5, wherein both side wall portions and bottom plate
A finishing plate 414a for both side walls; Between the finishing plate 414a for both side walls and the finishing plate 414b for the bottom plate and the outer finishing plate 415 at the spaced apart position from the finishing plate 414b for the bottom plate, Wherein the outer finishing plate (415) is supported by the pile (P) so that the outer finishing plate (415) is provided with a length extending in the longitudinal direction of the span Way. The method of claim 1,
The upper side of the completed bottom plate 110 is provided with a bottom plate rail 160 so that the inner side formwork 310 can slide in the longitudinal direction while the inner side formwork 310 slides along the rails 160 Wherein the low-depth tunnel upper part (200) having a desired shape and lateral width can be installed while being moved by one span in the longitudinal direction, thereby constructing a low-depth tunnel structure using the variable system form. 9. The system of claim 8, wherein the inner system die (310)
A vertical support member 311 having a roller at a lower portion thereof so as to move along a rail 160 installed on the bottom plate 110; A ceiling bottom form support member 312 connected to the upper portion of the vertical support member 311; And sidewall inner surface formwork supporting members 313 for both sidewall portions 120 installed on the lower and side surfaces of the ceiling bottom formwork supporting members 312 and the vertical supporting members 311, wherein the members 311, 312, and 313 are formed. Low-depth tunnel structure construction method using a variable system formwork, characterized in that spaced apart from each other in the longitudinal direction to be connected by one span. The apparatus of claim 9, wherein the upper sidewall portion and the ceiling outer formwork (320) extending upward along the upper outer surface of the upper side of the side wall portion (120) Wherein the concrete is placed between the inner system formwork (310), the upper sidewall part and the ceiling outer formwork (320) to construct the upper part of the tunnel.

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