KR100757710B1 - Dowel bar construction method for downward construction of underground structures - Google Patents

Abstract

A method for laying dowel bars of an underground structure constructed downward is provided to reduce the number of used couplers by reducing the number of joints, and to improve workability through integrated construction after downward construction of a beam and a slab. A plurality of pipes are vertically fixed and installed in a beam mold of each layer in the process of downward constructing a beam and a slab by casting concrete after a mold is installed. Upper and lower layers are connected to each other by allowing dowel bars to pass through the pipe that vertically penetrates a beam of each layer if the concrete is casted and then the mold is disassembled, so that the downward construction of the beam and slab is completed. A pillar and a wall structure are constructed by installing the mold and casting concrete, so that dowel bars are buried in the concrete of the pillar and the wall structure.

Description

Dowel bar construction method for downward construction of underground structures

Figure 1a is a cross-sectional view showing the installation state of the dowel rebar according to the prior art,

FIG. 1B is a cross-sectional view taken along the line 'F-F' of FIG. 1A,

2 is a sectional view of a state in which the beam formwork is disassembled;

3 and 4 is a cross-sectional view showing the construction of the interlayer connection of the dowel rebar according to the prior art,

5a and 5b is a view for explaining a problem according to the prior art,

Figure 6a and 6b is a cross-sectional view showing an example of a state in which the pipe construction inside the formwork in the dowel reinforcement construction process according to the present invention,

Figure 7 is a cross-sectional view of the formwork dismantled after the concrete construction in Figure 6a,

8 is a cross-sectional view taken along the line 'A-A' of FIG. 7,

FIG. 9 is an enlarged cross-sectional view of a portion 'B' in FIG. 7;

Figure 10a and Figure 10b is a cross-sectional view showing an example of the reinforcement state of the dowel reinforcement after the beam and slab construction in the dowel reinforcement construction process according to the present invention,

FIG. 11 is an enlarged cross-sectional view of a portion 'C' in FIG. 10A;

12 is a cross-sectional view showing in sequence the method of construction of the dowel rebar in the bearing wall according to the present invention,

FIG. 13 is a cross-sectional view taken along the line 'D-D' of FIG. 12,

14 is a cross-sectional view showing in sequence the method of construction of the dowel rebar in the non-bearing wall according to the present invention,

15 is a cross-sectional view taken along the line 'E-E' in FIG.

<Explanation of symbols for main parts of the drawings>

1: H-beam column 2: beam formwork

5: filling plate 6: dowel rebar

7: coupler 11: pipe

12: stopper 13: rebar

14 wire 15 fixing agent

The present invention relates to a method for constructing a multi-bar reinforcement of underground structures to be built in reverse, and more specifically, to be connected to each other and installed vertically inside the concrete of columns and wall parts for connection between upper and lower layers in underground structures to be installed in reverse. It is about construction method of dowel rebar.

In general, there are two ways to build underground structures.

After constructing the earthquake on the ground where the underground structure is constructed, install the temporary facility to support the earthquake while excavating the ground, take out all the earth and sand, and build the structure from the bottom floor, After the construction of the first-floor structure, using the structure as a retaining member for the earthquake, the reverse casting method is to construct the structure while drilling the ground from the top to the bottom.

In recent years, underground construction has been increasingly intensified in order to maximize land use. In particular, when the construction is carried out by the net pouring method, not only the construction of cracks due to the risk of earthquake collapse or the settlement of nearby buildings, but also visually unstable construction Due to various problems such as long periods of time, the reverse casting method has been widely applied in recent years.

In this reverse casting method, after constructing the retaining wall and the frame for the underground frame, the underground structures such as slabs and beams are constructed step by step from the ground floor to the underground floor. It can proceed at the same time, the floor of the ground floor can be utilized as a workshop, there is no need for a separate perforated plate, there is an advantage that the work can be plain.

Such a reverse casting method involves placing concrete slabs and beams on the ground while the ground is stopped (concrete on grade), and excaving the ground to some extent, selecting the ground, and then placing the clubs and installing the formwork to place the concrete. (Form on Supporting) and the method of placing concrete by suspending formwork on the concrete slab on the upper floor instead of establishing a swivel for supporting the formwork.

Among them, the method of using copper barley is a method applied to strata with relatively high relative density. After digging the ground, the discarded concrete is placed on the excavated ground, and the discarded concrete is used as the support base. After installing the concrete, the concrete of the beam and slab is poured.

Here, beam formwork and slab formwork are supported by clubs on discarded concrete on the excavation ground.

Recently, deck plate, which has the advantage of unsupported construction, has been developed to reduce the use of copper bar, and its use is gradually increasing. Underneath it, the beam formwork is installed by supporting the slab on the discarded concrete, and the deck plate is supported by the deck formwork between the formwork and the formwork.The concrete is then cast on the formwork and the deck plate to form the beam and slab (deck slab). To complete).

In this case, since the reverse casting method is used, first, the concrete is placed on the formwork and the deck plate, and the upper slab and the beam are pre-installed. Thus, the lower slabs and beams will be constructed.

In this way, the beam formwork and deck plate installation, slab and concrete placement of the slab are repeated in the construction process of each floor, and the underground structure is constructed step by step toward the basement floor.

On the other hand, in order to solve the problem of using the grouping, as a non-supporting formwork system for top down construction that is constructed from the ground floor to the lowest basement when building underground structures, Instead of installing it, an unsupported reversal suspension formwork was proposed to suspend the formwork on the pre-installed upper concrete slab.

This unsupported back-casting formwork is a method of constructing a lower slab by using the formwork with the formwork suspended from the upper slab.

In order to build underground structures of each floor using this method, concrete is laid on the formwork to construct the upper slab, and the formwork used in the construction of the upper slab is lowered by using a hydraulic lift on the upper slab. The construction of the lower slab using the lowered formwork is repeated for each floor.

This suspension method is more advantageous in securing the workplace and ensuring the safety of the worker because it is installed by hanging the formwork on the upper slab without installing the copper bar at the bottom of the slab formwork and the beam formwork. It is possible to proceed continuously, it is possible to obtain excellent concrete quality by securing a sufficient curing period, and at the same time has the advantage that it is possible to shorten the air and reduce the cost.

In particular, when the suspension method is applied, it is possible to simultaneously perform the three-stage process of underground frame construction, which continuously runs down the formwork suspended from the upper slab, the excavation work from the bottom, and the ground structure construction.

In addition, as a more improved method, while concrete is being laid on the beam formwork and deck plate of the construction layer, the load of the steel frame supporting girder supporting the beam formwork, deck plate, and formwork, including the concrete load, A method of supporting the bracket installed on the support has been proposed.

In the reverse casting system using the support bracket, a support bracket is mounted at the height of the corresponding floor of each frame pillar, and a support girder is supported on the support bracket, and the formwork is supported on the support girder, and the deck plate is provided on the formwork. Supported.

In addition, since the support bracket can be easily mounted and dismantled on the column, when the concrete and the concrete placing work of the beam and the slab is completed for the floor, each support bracket is lowered down to the height of the column and reinstalled to be used for the same purpose. do.

As such, the method using the support bracket is not a method of suspending and supporting the upper slab pre-constructed as in the prior art by using a suspension material, but a method of supporting the frame pillar through the support bracket. Many problems that have been pointed out can be solved.

On the other hand, when the reinforcement construction of the beams and slabs of the entire floor is completed, the pillar formwork is installed around the H-beam column constructed as a frame pillar, for example, a frame pillar, and then concrete is poured into the pillar. Carry out construction work.

In the process of installing the pillar formwork, the upper and lower dowel bars embedded in the pillars are connected to each other by using a coupler, and the connected dowel bars serve to connect the upper and lower layers. .

This pillar concrete pouring work should be carried out from the bottom floor, and for each floor, a pillar formwork is installed around the H-beam pillar, and a filling pipe is installed so that concrete can be poured into the pillar formwork. Concrete is poured into the column formwork.

Filling pipes for the installation of pillar concrete can be installed in the column and the column.

However, in the case of the pillar-filling method, since the filling pipe must be buried in advance around the H-beam column, it is difficult to embed the filling pipe during the construction of the beam, and the filling pipe penetrates the beam. There is a problem that the beam can be structurally vulnerable.

In addition, in the case of the pillar external filling method, the filling pipe is disposed in an inclined direction and installed outside the pillar, and at the same time, the lower opening of the filling pipe is connected to the inside of the pillar formwork, but also the filling pipe is installed through the slab. In the column, since the concrete can be filled only below the lower inlet of the filling pipe, the upper portion of the lower inlet has a problem in that concrete is pre-poured separately.

In order to solve this problem, Utility Model Registration No. 403663 (filed on November 23, 2005) filed and filed by the inventor under the name "column concrete pouring structure" is filled between both ends of two flanges along an H-beam column. A technique for installing a plate is disclosed.

In this case, after reversing the beams and slabs of each floor, the SRC composite columns are smoothly constructed from the bottom layer. As a concrete concrete casting structure, instead of installing a filling pipe as in the prior art, the inner spaces of both flanges of the H-beam columns are closed. The filling plate is long welded between the two flange ends along the H-beam, so that it can be sealed in the form of a face and the top and bottom can be opened.

The flange inner space formed by the filling plate serves as a concrete pouring passage connecting the upper and lower column spaces through the beam up and down after concrete construction of the beam and slab, and the upper opening of the flange inner space is concrete inlet. The concrete is to be introduced through this flange inner space.

On the other hand, when explaining the dowel rebar construction method according to the prior art.

First, in the process of reverse construction of the underground structure, after installing the formwork and slab formwork of a specific layer, as shown in Figure 1a to install the dowel rebar to penetrate the formwork up and down, the dowel reinforcement is shown in Figure 1b As shown, it is installed by arranging at predetermined intervals around the frame pillar H-beam, and is fixed by weaving with wire to the reinforcing bars are reinforced inside the formwork.

Then, after pouring the concrete of the beams and slabs, as shown in Figure 2, the formwork is dismantled.

This beam and slab construction process is repeatedly performed while going down to the lower floor, and when the construction of the entire floor is completed, the SRC composite column is smoothly constructed from the bottom layer, and the filling plate is installed on the H-beam column which is a frame pillar (FIG. 1B). 3), as shown in FIG. 3, the intermediate dowel bars are connected between the upper dowel bars and the lower dowel bars.

At this time, the connection of the dowel rebar is connected using a coupler (metal fittings).

Thereafter, the pillar formwork of the floor is installed, and then concrete is poured through the filling plate so that the concrete is filled inside the pillar formwork (which is installed along the pillar concrete placing line in the drawing), and after the concrete is cured, the pillar After dismantling the formwork, construction of the dowel rebar is completed as the reinforcing bar connecting the upper and lower floors in the state embedded in the concrete as shown in FIG.

4 is a cross-sectional view showing the connection state of the dowel rebar in three layers.

However, according to the construction method of the dowel rebar according to the prior art as described above had the following problems.

First, as shown in FIG. 4, the number of joint parts becomes too many for each layer (normally two joints of one layer).

That is, after installing the dowel reinforcing bar through the formwork for beam and slab construction, the concrete of the beam and the slab is poured, and the dowel reinforcing bar through the upper and lower layers (which is the dowel reinforcing bar through the formwork) during the column construction. After linking each other with intermediate dowel bars and installing pillar formwork and pouring concrete, it is essential to connect at least two reinforcing bars in each floor to connect the upper and lower dowel bars with middle dowel bars.

As the number of joints of reinforcing bars increases, the number of use of couplers becomes unnecessary. Especially, the installation of dowel rebars in several stages, such as the installation of dowel reinforcing bars through the formwork and the installation of intermediate dowel bars before column concrete As the construction is divided and carried out, there are various problems such as a decrease in work efficiency, an increase in work process and workforce, and an increase in cost and time.

 In particular, as the dowel reinforcing bars are installed through the formwork, holes are formed in the formwork so that the dowel reinforcing bars become difficult to recycle the formwork.

In addition, after the construction of the beam is completed by installing a dowel reinforcing bar penetrating through the formwork and placing concrete inside the formwork, the dowel reinforcing bar installed to penetrate vertically is dismantled. Makes it difficult.

That is, as shown in FIG. 5a, when the beam formwork is to be dismantled after the construction of the beam is completed, it becomes difficult to dismantle the formwork downward due to the interference of the coupler.

In addition, as shown in FIG. 5B, even if the coupler is not installed in advance, if a load is applied by concrete placed inside the formwork, even if a slight bending occurs in the rebar, that is, the bending of the reinforcing bar may also cause interference. There are many difficulties in dismantling the formwork downwards.

Therefore, the present invention was invented to solve the above problems, by inserting the dowel reinforcement of the reinforcement of the reinforcement of the beam and slab into the inside of the pipe in a batch connection, reducing the number of joints and coupler use of the dowel rebar, The purpose of the present invention is to provide a method for constructing the reinforcing bars of underground structures to be constructed in reverse, which has the effect of improving work efficiency, reducing work process and workforce, and reducing costs and time.

In addition, since the dowel reinforcement is carried out through pipes after dismantling the formwork, it is not necessary to make holes for the penetration of the reinforcement in the formwork, thereby improving the recyclability of the formwork, and making it easier to dismantle the formwork. The purpose is to provide rebar construction methods.

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

In order to achieve the above object, the present invention, in the construction method of the dowel reinforcement is installed vertically embedded and interlayer connection in the concrete interior of the column and the wall for the connection between the upper and lower layers in the reverse construction underground construction,

Placing concrete after installing the formwork and fixing a plurality of pipes vertically inside the beam formwork on each floor in the process of laying down the beams and slabs;

When the concrete is finished by dismantling the formwork after the concrete is laid, passing the dowel reinforcing bars through the pipes vertically through the beams of each floor to connect the upper and lower floors;

Installing a formwork and placing concrete to construct pillars and walls to purchase dowel reinforcing bars within the concrete of the constructed pillars and wall portions;

Provides a method for constructing the rebar reinforcement of the underground structure to be constructed in reverse, comprising a.

Here, each of the pipes, the upper end is installed higher than the beam concrete placing surface so that a portion to be exposed to the side of the concrete to be constructed later, the lower end is characterized in that it is installed to be in close contact with the inner bottom surface of the formwork.

In addition, a stopper for preventing the inflow of concrete is installed on the upper end exposed to the complementary side of each pipe.

In addition, each of the pipes is characterized in that it is fixed to the reinforcing bar is installed in the formwork by fixing the wire or welded.

In addition, after installing the reinforcing bars in each of the upper and lower heights so as to be adjacent to the pipe while following the row of pipes in the formwork, it is characterized by fixing or welding by fixing the pipes to the reinforcing bars so installed. It is done.

In addition, after passing the dowel reinforcement inside the pipe is characterized in that the pipe and the dowel reinforcement is integrated by injecting a fixing agent into the inner space of the pipe.

In addition, it is characterized in that to use a pipe having an uneven structure on the inner peripheral surface in order to improve the integrity by the fixing agent.

In addition, the uneven structure is characterized in that formed by threading the inner peripheral surface of the pipe.

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

6a and 6b is a cross-sectional view showing an example of a state in which the pipe construction inside the formwork in the reinforcing bar construction process according to the present invention, Figure 7 is a cross-sectional view of the formwork is dismantled after the concrete construction in Figure 6a.

8 is a cross-sectional view taken along a line 'A-A' of FIG. 7, and FIG. 9 is an enlarged cross-sectional view of a portion 'B'.

10A and 10B are cross-sectional views illustrating examples of a state in which a dowel rebar is disposed after beam and slab construction in a dowel rebar construction process according to the present invention, and FIG. 11 is an enlarged cross-sectional view of a portion 'C' in FIG. 10A. .

The present invention relates to a construction method of a dowel reinforcing bar installed vertically embedded and interlayer connection in the concrete of the pillars and the wall portion for the connection between the upper and lower floors in the reverse construction underground structure.

First of all, the construction of underground structures to which the reverse casting method is applied will reverse the construction of beams (G) and slabs (S) while descending from the upper floor to the lower floor, and the beams (G) and slabs (S) of each floor will be formed in the beam formwork. (2) After installing the slab formwork (3) and reinforce the reinforcing bar (4) inside, and then cast concrete inside the formwork proceeds to dismantle the formwork (2).

In this way, after installing the beam formwork (2) and the slab formwork (3) to construct the beam (G) and slab (S) of each layer, and after reinforcing reinforcing bars (4) in the interior, conventionally placed concrete Previously, a plurality of dowel bars were vertically installed so as to penetrate the formwork 2, and in the present invention, the installation process of the dowel bars penetrating the formwork 2 is eliminated, and instead, the inside of the formwork 2 is removed. A plurality of pipes 11 for forming the vertical through passage of the beam G is fixed vertically.

That is, as shown in Fig. 6a or 6b, the pipe 11 is vertically installed vertically in the beam formwork 2, the upper end of the pipe 11, the upper side of the beam (G), which is then concrete construction In order to be able to expose a part, it is installed to protrude by a predetermined height than the beam concrete placing surface.

In addition, at this time, the lower end of the pipe 11 is installed to be in close contact with the inner bottom surface of the formwork (2).

The pipe 11 is a pipe 11 which is installed so that the dowel reinforcement 6 is inserted and passed through before the column construction, that is, the pillar formwork and concrete pouring, as described later, in the present invention, a plurality of pipes 11 Even inside the formwork (2) is installed vertically at each position where the dowel reinforcement (6) is arranged.

As shown in FIG. 8, the pipe 11 is installed at each position in which existing dowel reinforcing bars are disposed around the H-beam pillar 1, which is a frame pillar within the beam formwork 2. 2) It is disposed and arranged at a predetermined interval to form a rectangular array around the H-beam pillar (1) inside.

When the concrete is poured in the state in which the pipe 11 is installed in the inside of the beam formwork 2 as described above, the pipe 11 is the upper side and the lower side of the beam G when dismantling the formwork 2 later. To form a passage connecting the vertical, the pipe (11) by the pipe (G) is to form a passage through which the dowel reinforcement (6) can vertically penetrate.

As a result, the dowel reinforcement 6 is installed so as to penetrate the beam G up and down by inserting the dowel reinforcement 6 into each pipe 11 and passing it as described below before the post-beam concrete pouring after the beam G construction. In this way, the pipe 11 is to form a passage through which the reinforcing bars 6 can penetrate up and down in the concrete constructed beam G.

That is, in the construction method of the present invention after installing the pipe (11) up and down inside the beam formwork (2), the concrete is poured, to create a vertical through passage formed by the pipe (11) in the beam (G) to be constructed In addition, the main feature is to insert the dowel reinforcement (6) through the vertical through passage to connect the layers.

The pipe 11 may be a pipe or steel pipe made of PVC, can be fixed to the reinforcing steel reinforcement (4) existing in the formwork (2) by tying with a wire 14 or fixed by welding in the case of steel pipes. Do.

More preferably, as shown in Figs. 6A and 6B, and Figs. 7 and 8, a plurality of pipes 11 are installed around the H-beams 1, but the pipes (2) inside the formwork (2). After installing additional reinforcing bars 13, respectively, in the upper and lower heights along the row of 11), the pipes 11 are tied to the reinforcing bars 13, and the wires 14 are fixed or welded. It is also possible to fix.

As shown in FIG. 8, the reinforcing bars 13 are arranged in a rectangular shape so as to be adjacent along the outer side (see FIG. 6A) or the inner side (see FIG. 6B) of the pipe 11, and FIGS. 6A and 6B and FIG. As shown in Fig. 7, they are installed in two positions up and down respectively.

The reinforcing bar 13 serves to fix the position of the pipe 11 together with the role of reinforcing to prevent cracking that may occur along the pipe 11 row.

In addition, as shown in FIG. 11, the inner circumferential surface of the pipe 11 may be machined with a thread 11a so that irregularities can be formed when viewed in cross section. Such a structure may be fixed after insertion of the dowel rebar 6 as described below. In the state in which the agent (15) is injected, the unity between the pipe 11 and the dowel rebar 6 is further improved.

That is, after inserting the dowel reinforcement (6), the fixing agent (15), such as cement milk, is injected into the inner space of the pipe (11). At this time, after the fixing agent (15) is cured, the inner surface of the pipe (11) and the dowel reinforcement are inserted. The outer circumferential surface of (6) is integrally fixed by the fixing agent 15, and when the thread 11a is processed on the inner circumferential surface of the pipe 11, the threaded bone 11b portion of the pipe 11 and the dowel reinforcement 6 As the fixing agent 15 is filled between the projections 6a, the pipe 11 and the dowel reinforcing bars 6 can be more reliably integrated (slip between the pipe inner circumferential surface and the fixing agent, the dowel reinforcing bar surface and the fixing agent Completely prevented).

As the above, in the state in which the pipe 11 is installed in the formwork (2), the concrete is placed inside the formwork (2), and after the concrete is cured, the formwork (2) is dismantled. 7 shows the dismantled state, and in order to prevent the concrete from flowing into the pipe 11 through the upper end of the pipe 11 when concrete is poured into the inside of the formwork 2, FIG. 9. As shown in, it is preferable to install a stopper 12 to prevent the inflow of concrete at the upper end of the pipe 11 exposed to the upper beam (G).

In the construction method of the present invention, since only the pipe 11 is installed inside the formwork 2, the dowel reinforcement 6 is not provided so as to penetrate the formwork 2 as in the prior art. It is not necessary to process any holes in 2), and the dismantling of the formwork 2 is also very easy since the interference by the dowel bars 6 installed in advance as in the past does not occur fundamentally.

On the other hand, after installing the pipe (11) in the beam formwork (2) and re-installing the beam (G) and slab (S) of the entire floor by installing concrete, the column construction is performed as before. Construct the net from the bottom floor.

In the column construction of each layer, the filling plate 5 which seals the inner space of both flanges of the H-beam column 1 in the form of a closed cross section is welded, and the dowel reinforcement 6 is installed inside the pipe 11. After inserting the beam (G) up and down through the interlayer connection construction, and finally to install the column formwork (to be installed along the pillar concrete placing line) to pour the pillar concrete.

As such, in the process of constructing the column while going up from the lower layer to the upper layer, the dowel reinforcing bar 6 passes through the pipe 11 embedded in the beam G before installation of the column formwork and is connected up and down.

At this time, the coupler 7 is used to connect the upper and lower dowel bars 6 as in the related art, but as shown in FIGS. 10A and 10B, the dowel bars 6 are connected to each other by passing through the pipe 11. In addition, as shown in FIG. 11, the fixing agent 15 is injected into the space between the pipe 11 and the dowel rebar 6 to be integrated.

FIG. 10A illustrates an example in which the dowel bars 6 are connected to one layer in one layer, and FIG. 10B illustrates an example in which the dowel bars 6 are connected to one layer in two layers.

As described above, according to the construction method of the present invention, since the dowel reinforcing bars 6 are collectively inserted into the pipe 11 after the reverse construction of the beams G and the slabs S, two places of one floor as in the prior art. Compared with a joint, the joint construction of one place of one floor or one place of two floors with which a joint site was reduced is attained.

Of course, in some cases, the joint construction of the dowel rebar 6 may be performed every three or more layers.

After installing the dowel reinforcement 6 as described above, the pillar formwork is installed per floor as in the prior art, and then the pillar netting construction for placing concrete through the flange inner space formed by the filling plate 5 is performed.

Filling plate installation and pillar concrete pouring using the same is as disclosed in Utility Model Registration No. 403363 (Nov. 23, 2005).

10A and 10B, the bottom dowel reinforcement 6 is fixed to be embedded in the lower part of the base concrete as in the prior art, which is fixed to another upper dowel reinforcement bar (7) through the coupler 7 installed at the upper end thereof. 6).

On the other hand, the construction method of the dowel rebar 6 in the column can be applied to the construction of the dowel reinforcement (6) to enter the bearing wall or non-bearing wall.

FIG. 12 is a cross-sectional view sequentially illustrating a method for constructing a dowel rebar in a bearing wall, and FIG. 13 is a cross-sectional view taken along the line 'D-D' of FIG. 12.

FIG. 14 is a cross-sectional view sequentially illustrating a method for constructing a dowel rebar in a non-bearing wall, and FIG. 15 is a cross-sectional view taken along the line 'E-E' of FIG. 14.

As shown, the dowel reinforcement 6 is embedded between the upper beam G and the lower beam in the wall portion, not the column portion, wherein the construction of the dowel reinforcement 6 is performed in the beam G of each layer. ) And the slab (S) during the construction of the pipe (11) inside the beam formwork (2), after the concrete is laid and dismantled to complete the construction of the beam (G) and slab (S) in the floor, and then After finishing the beam (G) and slab (S) construction of the floor, insert the dowel reinforcement (6) into the pipe (11) and connect the construction and then wall smooth construction.

The construction method of the dowel reinforcement (6) is the same construction method and the process itself in the column portion, but the arrangement of the dowel reinforcement (6) is different from the pillar portion, so the pipe (11) to be constructed inside the formwork (2) There is also a difference.

13 and 15, in the case of the bearing wall, pipes 11 are arranged in two rows along the formwork 2, and in the case of the non-bearing wall, the pipes 11 are arranged along the center of the formwork 2. The pipes 11 are arranged in one row.

In addition, a separate reinforcing bar 13 is installed in the wall so as to be adjacent to the pipe 11 so as to be adjacent to the pipe 11 so as to fix the pipe 11, and each pipe is installed in the reinforcing bar 13. (11) is fixed by weaving or welding the wire (14).

Of course, the reinforcing bar 13 is installed to the upper side and the lower side, respectively, the reinforcing bar 13 is installed in this way with the role of reinforcement to prevent cracks that may occur along the pipe (11) heat It serves to fix the position inside the formwork (2).

In the bearing wall, the dowel bars 6 are passed through the inside of each pipe 11 arranged in two rows of left and right, and the upper dowel bars 6 and the lower dowel bars 6 are connected to each other in a row, and then the walls are connected. In the non-bearing wall, the dowel reinforcement 6 is passed through each of the pipes 11 arranged in a single row in the center, and the dowel reinforcement 6 in the center and the two dowel reinforcements 6 on both sides are stacked. After connection, wall construction is done.

In summary, the pipe 11 is constructed inside the beam G as in the column portion, and after the dowel reinforcement 6 is inserted into the pipe 11 to perform the interlayer connection construction, the wall smooth construction is performed.

In this way, according to the dowel reinforcement method according to the present invention, it is possible to reduce the joint portion of the dowel reinforcement (6) in the underground structure, easy disassembly of the formwork (2), recycling the formwork (2) There is an effect of improving the sex.

Hereinafter, according to the dowel reinforcement method of the underground structure to be constructed in the reverse casting according to the present invention, the following effects.

1) Dowel reinforcing bars and slabs are inserted into the inside of the pipe after the re-installation of the beams and slabs, so that the joints are collectively connected. Possible) Construction of one joint is possible, and in this way, it is possible to reduce the joint position of the dowel rebar in the underground structure.

2) The use of couplers can be reduced by reducing the number of joints, and the batch construction after the reverse construction of beams and slabs will improve the work efficiency, reduce the work process and workforce, and reduce costs and time.

3) After dismantling the formwork, the dowel reinforcing bars will be installed through the pipe, thus eliminating the need for the hole processing for penetrating the reinforcing bar into the formwork, thus improving the recyclability of the formwork.

4) After dismantling the formwork, the dowel reinforcing bar is installed through the pipe, so the interference with the dowel does not occur when the formwork is dismantled. Therefore, the formwork is easy to dismantle.

Claims (8)

In the construction method of the dowel reinforcing bar is installed in the vertical structure in the concrete of the column and the wall for the connection between the upper and lower floors in the reverse construction, Placing concrete after installing the formwork and fixing a plurality of pipes vertically inside the beam formwork on each floor in the process of laying down the beams and slabs; When the concrete is finished by dismantling the formwork after the concrete is laid, passing the dowel reinforcing bars through the pipes vertically through the beams of each floor to connect the upper and lower floors; Installing a formwork and placing concrete to construct pillars and walls to purchase dowel reinforcing bars within the concrete of the constructed pillars and wall portions; Dowel reinforcement construction method of the underground structure to be constructed in reverse, comprising a. The method according to claim 1, The pipes, the underground structure to be installed in reverse construction, characterized in that the upper part is installed higher than the beam concrete pour surface so that a portion is exposed to the complementary side of the concrete construction afterwards, and the bottom end is in close contact with the inner bottom surface of the formwork Dowel rebar construction method. The method according to claim 2, Dowel reinforcement construction method of the underground structure to be installed in reverse pouring characterized in that a stopper is installed to prevent the inflow of concrete at the upper end exposed to the complementary side of each pipe. The method according to claim 1, Wherein each pipe is a reinforcing bar construction method of reinforcement underground construction, characterized in that the fastening or welding by fixing to the reinforcing steel bar is installed inside the formwork. The method according to claim 4, After installing the reinforcing bars in the upper and lower heights so as to be adjacent to the pipes while following the row of pipes in the formwork, the pipes are fixed to the reinforcing bars thus installed or fixed by welding. Dowel reinforcement method of underground structures to be constructed in reverse. The method according to claim 1, Dowel reinforcement construction method of the underground structure to be installed in the reverse casting structure characterized in that the pipe and the dowel reinforcement is integrated by passing the dowel reinforcement inside the pipe and then injecting a fixing agent into the inner space of the pipe. The method according to claim 6, Dowel reinforcement construction method of the underground structure to be built in reverse casting, characterized in that to use the pipe having an uneven structure on the inner peripheral surface in order to improve the integrity by the fixing agent. The method according to claim 7, The uneven structure is a dowel reinforcement construction method of the underground structure to be constructed by reverse casting, characterized in that formed by threading the inner peripheral surface of the pipe.

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