KR20020007521A - method for underground construction of building by using permanent structural member as strut for support retaining wall - Google Patents

Abstract

PURPOSE: A method for constructing underground structure using permanent structural member of building as sheeting strut is provided to shorten the term of works, to reduce construction expenses, to execute underground excavation works easily and to exclude a correction work of post clearance. CONSTITUTION: The method for constructing underground structure using permanent structural member of building as sheeting strut comprises the steps of: installing a retaining wall(4) along the border of a building and driving a center pile in the position of a building column according to a sectional plan; after primary pit excavation, fixing and installing a steel bracket(24) for supporting a primary wall girder mold form and placing a girder in the retaining wall(4); erecting a mold form(10) for molding a primary wall girder on the steel bracket(24); placing a girder(20), whose one end is fixed with a shear connector(28) for the wall girder, to place in the mold form(10) for molding a primary wall girder, and fixing the other end of the girder(20) to a center pile or a girder; arranging a reinforcing bar in the mold form for the primary wall girder; placing concrete in the mold form to be buried together with the shear connector(28) to connect a retaining wall(4), a wall girder(18) and a girder(20) in one; and repeating above processes as many as the number of the necessary basement.

Description

Method for underground construction of building by using permanent structural member as strut for support retaining wall}

The present invention relates to a basement construction method of a building, and in particular, a method related to earthwork in building a building such as a city center building, and more particularly, it is a permanent horizontal structural member of a building without using a temporary propulsion support for earthquake walls. The present invention relates to a method for constructing underground structures using beams as braces for supporting wall walls.

In the case of building large buildings such as buildings in the city center, the basement will be built for economic, mechanical, and legal reasons such as efficient use of land, stable support of buildings, and securing parking lots. In the case of underground excavation work to build the underground structure of a large building such as a building, a barrier wall is installed. Representative types of retaining walls that are currently widely constructed include a retaining wall (aka earth plate), soil cement wall (SCW), cast in place pile ), DW (diaphragm wall, also known as slurry wall), and the earth pressure support method using soy nail, tie rods, earth anchor, rock bolts, etc. Anchor type (tension support method) and brace strut method (compression support method). Which earthquake support method is selected or used together with the earthquake support method for the earthquake walls in the underground works depends on the construction scale, geology, groundwater, the conditions of the adjacent site, the construction environment, etc. It builds up from the bottom of the basement and goes up to the top while supporting the hydraulic pressure).

The general masonry wall support brace installed in the underground structure construction method is a temporary structure, which is not only a obstacle when moving or unloading various construction materials, when placing concrete or breaking, but also a separate process from this construction. As it must be installed, dismantled or relocated, the construction cost increases and the air acts as a factor.

In connection with this problem, a method of constructing an underground structure using a part of the underground permanent structure of a building, for example, a girder or beam, which is a permanent horizontal structural member of the building, as a support for supporting a retaining wall (hereinafter, referred to in this specification) Is called 'permanent structure strut method' and has been applied in several places in Korea. The conventional permanent structure strut method allows a beam, which is a permanent horizontal structural member of a building, to be used as a brace for a retaining wall, omitting a brace construction process as a temporary structure, and thus, it is evaluated as a breakthrough in the construction industry.

Hereinafter, the conventional permanent structure strut method will be described in more detail with reference to the accompanying drawings.

1 to 6 is a construction drawing of the conventional permanent structure strut method, Figure 1 is a schematic flowchart of the main construction method and the construction procedure, Figure 2 is a diaphragm mud wall (according to the method described in Figure 1) FIG. 3 is a schematic perspective view of a diaphragm wall and a center pile, and FIG. 3 is a schematic perspective view in which a first band (first edge rib), which is integrated with the earthen wall, is installed. 4A to 4D are cross-sectional views of the edge beams of FIG. 3, respectively, and show a sequence of constructing the edge beams, and FIG. 5 shows a primary beam fixed to a connection plate embedded at one end of the edge pile and the other end embedded in the edge beam. It is a schematic perspective view showing what was constructed, and FIG. 6 is a schematic perspective view of the state in which the secondary beam was installed by repeated construction.

As can be seen from these drawings, the conventional permanent structure strut method includes the steps of installing a retaining wall 4 along a building boundary line 2 and driving a center pile 6 at a column position according to a plan design; A step of installing a first frame rib construction form 10 supported by the club 8 after contacting the inner side of the retaining wall after the first destruction; Mounting a reinforcing bar (12) and a beam connecting plate (14) in the frame beam formwork and then placing concrete (16) to construct the first frame (18) integrally with the retaining wall (4); After the first edge beam curing, one end of the beam 20, which is a permanent horizontal structural member of the building, is welded to the center pile 6 or the girder 7, and the other end is welded to the connection plate 14 embedded in the edge beam. Process of doing; The above process includes a method including a step of sequentially repeating the required number of underground layers.

The permanent structure strut method as described above uses a beam, which is a permanent horizontal structural member of the building, as a brace for the masonry wall, without constructing the brace wall support brace as a conventional temporary structure. By removing physical interference such as when moving or unloading various construction materials, digging, and placing concrete, the construction of underground structures was much more convenient than the conventional construction method.

However, the conventional permanent structure strut method as described above has been found to have the following problems.

First, the formwork supporting copper wheel (8) for constructing the rim beam (18) should be supported on the upper surface of the uneven and uneven surface of the excavated land. Bare concrete for wet barrier support, which is wet construction, requires much time, cost and equipment to be poured, hardened and dismantled.

Secondly, the rim beam needs to be fully cured and cured as a mechanical structural member, and the copper barley must be maintained until the rim beam is sufficiently cured. Is disturbed.

Thirdly, the beam connecting plate embedded in the rim beam is not an continuous member but an intermittent member, and it is not easy to fix it precisely at a certain position in the formwork. It is difficult to change its position once it is embedded in concrete. Therefore, even if the length of the beam is factory-produced according to the distance between the connecting plate and the center pile, the construction error of the retaining wall, the construction error of the rim beam, the vertical construction error of the center pile, and / or the embedding position of the connecting plate This gap is compensated for because the gap between the connecting plate and the center pile and the length of the factory-produced beams are often not exactly the same (usually 10mm to 20mm) due to construction errors. If the length of the beam is short, the extension plate for length extension must be welded, and if the length is long, the length of the beam must be cut. Compensation for the length deviation of steel structures in the field is comparable to the factory production because the steel members of heavy loads are supported by separate supporting equipment (crane or backhoe, etc.) regardless of whether they are cut or connected. The work reliability is lowered, resulting in a loss of the integrity of the quality in the compensation part. Also, when the length compensation work is performed, detailed mechanical calculations, such as the connection part, should be selected as the place where the bending moment and shear force are applied to the minimum, and it is uneconomical as the welding work length increases, and the suspension state of the beam As it is the work in (iii), it also carries risks.

The present invention provides a novel method that can solve the above-mentioned problems in the permanent structure strut method, which allows the beam, which is a permanent horizontal structural member of the building, to serve as a support for the retaining wall.

The present invention in the permanent structure strut method that utilizes the beam, which is a permanent horizontal structural member of the building as a brace for the retaining wall without constructing a brace for supporting the retaining wall as a conventional temporary structure, it can further shorten the air and reduce the construction cost It is aimed to provide a new rim beam (belt) installation method that can be used to facilitate underground excavation work.

Another object of the present invention is a permanent structure strut method that utilizes a beam, which is a permanent horizontal structural member of a building, as a brace for a retaining wall, without constructing a support wall for supporting a retaining wall as a conventional temporary structure, the center pile or a girder and an edge It provides a new method to eliminate post-length clearance corrections, especially welded joints and cuts, caused by gaps between the connection plates embedded in the beams that do not match the lengths of the factory-produced beams. will be.

1 is a schematic flowchart of a known construction method and construction procedure using a permanent horizontal structural member of a building as a support for a retaining wall.

Figure 2 is a schematic perspective view of the construction of the diaphragm wall and the center pile in accordance with the construction method described in FIG.

3 is a schematic perspective view of the first frame ribs integrated integrally with the retaining wall.

4A to 4D are cross-sectional views of the rim beam construction sequence, respectively.

5 is a schematic perspective view showing that one end is fixed to the center pile and the other end is fixed to the connection plate embedded in the rim beam is constructed.

6 is a schematic perspective view of a counterpart provided with secondary beams by repeated construction;

7 is a process flowchart of the method for constructing an underground structure using a permanent structural member of a building as a brace according to the present invention.

8A to 8D are each a longitudinal cross-sectional view of the main process according to the process sequence described in FIG.

9A to 9C are perspective views illustrating a configuration example of a shear connection member for a rim beam welded to one end of each beam.

(Description of the reference numerals for the main parts)

4: retaining wall 6: center pile

8: Dongburi 10: Formwork for Rim Beam Construction

12: rebar 14: embedded plate for beam connection

16: concrete 18: rim beam

20: beam 22: earthwork H-beam file

24: bracket foot 28: shear connection member welded to one end of the beam

32: stud bolt, 34: angle

36: deformed rebar

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

7 is a process flowchart of the method for constructing an underground structure using a permanent structural member of a building according to the present invention as a brace. As can be seen from Figure 7, a preferred embodiment of the underground structure construction method using a permanent structural member of the building according to the present invention as a retaining brace,

A first step of installing the center wall along the boundary of the building and putting the center pile at the location of the column according to the plan design;

A second step of fixing the steel aggregate protrusion bracket (also called a magpie foot, hereinafter a magpie foot) for supporting the first frame rib formwork and placing the beam on the inner side of the retaining wall after the first destruction;

A third step of erecting a first frame rib forming die on the bracket;

A fourth step of mounting one end of the beam to which the shear connection member is fixed at one end so that the shear connection member is located in the frame for constructing the frame beam, and fixing the other end of the beam to the center pile or the girder;

A fifth step of reinforcing reinforcing bars in the first frame formwork; And

And a sixth step of placing the concrete in the formwork so that the shear connecting member fixed to one end of the reinforcement and the beam is integrally coupled to the retaining wall, the frame beam and the beam.

The construction of the underground structure using the permanent structural member of the building according to the present invention as a brace for the masonry is made by repeating the second to sixth processes sequentially in the downward direction as many as the number of underground floors required, and constructing the last underground floor. After that, the basement work is performed under normal ground, and after the foundation work, the retaining wall, which is the outermost bearing wall, is sequentially placed in each vertical space between the rim beam and the rim beam.

8a to 8d is a longitudinal cross-sectional view of the main process according to the above-described method of the construction of the underground structure using the permanent structural member of the building as a brace according to the present invention, in these drawings H-beams and masonry barrier as a thumb pile The permanent structure strut method in this used earth plate retaining wall structure is illustrated. The structure of fixing the bracket feet 24 to the retaining wall 4 can be variously determined according to the type of retaining wall. For example, although not shown, the retaining wall is a diaphragm wall (DW), and the studs in the retaining wall are included. The bracket feet can be fixed by embedding anchor members such as bolts.In the case of CIP, the bracket parts of the H-beams are partially exposed by welding the concrete surrounding the H-beams and welding the brackets to the exposed flanges. Or it can be fixed by bolting, as shown in the accompanying drawings (Fig. 8a to 8d) in the case of earth plate plate wall 4 using the H-shaped steel 22 as the thumb pile thumb pile (H-shaped steel Brackets can be fixed by welding or bolting to the flange of).

8a is a step of fixing the steel aggregate bracket foot 24 to the upper surface to allow the frame beam formwork and to place the beam on the inner surface of the retaining wall H-shaped steel (22) 2 step). As can be seen from this figure, the present invention is to be supported by the bracket claw 24 which can be fixed in the cantilever method to the retaining wall H-beams 22, unlike the formwork for building the conventional rim beam is supported by the copper bar (8) Therefore, the lower part of the bracket becomes free space. The dry construction of the bracket type method for supporting the formwork (10) eliminates much time, cost, and equipment required for placing, hardening, and dismantling the plain concrete by stably supporting the grouping when the formwork is supported by the conventional grouping. Not only can it be done, but the problem of delaying the dig process of the lower floor is solved by the existence of the copper bar until the conventional rim beam is cured, and it is also possible to exclude the physical interference of various constructions due to the existence of the copper bar. The technical and economic significance in the construction of underground structures using the strut method is very large and forms one aspect of the present invention. Reference numeral 25 is an inclined support member of the bracket.

Figure 8b is a view showing another feature of the method according to the invention well, it is a view showing the third step of the present invention described above. As can be seen from this figure, the present invention is to cast the concrete in the state of pre-embedded beam connection plate in the conventional rim beam (see Figs. 4a to 4d) and post weld one end of the beam to this connection plate in the post Unlike the way of producing, in the factory production of the beam in advance by combining the predetermined transmission connecting member 28 which can be connected to the edge beam to one end of the beam in advance, the shear connection member 28 of the beam is the edge beam By placing the frame beam concrete 16 in a state to be mounted in the building formwork 10, it is characterized in that the construction of the frame beam and the coupling of the beam is made at the same time. Therefore, in the present invention, the construction procedure consisting of post-position welding on the connection plate of the prior art → concrete placing → hardening → beam connection plate in the formwork is mounted on the end of the beam in which the shear connection member 28 is fixed in the formwork. It is characterized by the construction order being changed by concrete casting. By changing the construction order, the beams generated by the gap between the conventional center pile 6 or the girder 7 and the connection plate 14 embedded in the rim beam do not coincide with the length of the factory-produced beam 20. The need for post-length clearance corrections, such as welded joints or welded cuts, is essentially eliminated.

On the other hand, in the understanding of the present invention, the characteristics of forming the brackets instead of the clubs and changing the construction order are independent features that are not mutually related to each other. Therefore, the basement using the beam 20, which is a permanent horizontal structural member of the building, as a brace In constructing a structure, the above two features should be construed as falling within the scope of the present invention even if only one is selectively implemented. For example, according to one feature of the present invention while the construction of the copper bar, it is also possible to perform the process of mounting the end of the beam welded to the shear connecting member in the formwork → concrete placement → hardening, instead of the copper bar according to another feature of the present invention During the construction of the bracket, it is possible to take the construction procedure of preliminary placement of concrete in the formwork, placement of concrete, hardening, and beam welding. However, when applying the construction method according to the present invention when building a building underground construction, it is preferable to apply the above two features at the same time.

On the other hand, in the construction of the permanent structure strut method according to the invention the calculated design dimension between the rim beam 18 and the center pile (6) or girder (7) the length of the beam 20 including the shear connection member 28 It is preferable to produce a longer length by a predetermined length (eg, about 10 mm to 20 mm, which is confirmed by empirical rules in the conventional method). Because the present invention is to mount one end of the beam in the frame beam formwork before placing the frame beam concrete, even if the length of the beam is made longer, the added length is in the widthwise width space (W) of the frame beam formwork This is because the conventional shortage problem can be naturally solved as the length is added, and the length of the beam is mounted on the formwork floor before the frame beam concrete is placed. The width W of the rim beam can also be erected after the end of the beam is mounted on the formwork floor by varying the form width afterwards so that the end of the beam can be coupled to a sufficiently embedded position in the rim beam.

Figure 8c is a view showing the step of reinforcing the reinforcing bars (12) required in a state in which one end of the beam coupled to the shear connection member 28 in the frame beam formwork (10) (the fifth process of the present invention) FIG. 8D illustrates the sixth process of the present invention as described above in which the retaining wall 4, the rim beam 18 and the beam 20 are integrally coupled by placing concrete 16 in the formwork 10. FIG. to be.

In the above description, if the shear connecting member 28 coupled to one end of the beam is a structure for effectively coupling the rim beam 18 and the beam 20, the shape is not limited and the rim beam ( The means for enhancing the binding force to the retaining wall 4 of 18) is not limited in its form. For example, the shear connection member 28 for the rim beam 18 of the beam 20 is a stud bolt coupled to the flat plate (30) blocking the curl of the beam 20, as shown in Figure 9a to 9d ( 32), the angle 34, the combination of the stud bolt 30, the angle 34, the deformed reinforcement (36), etc., the means for enhancing the binding force to the retaining wall (4) of the rim beam (18) likewise studs It can be bolts, angles, stud bolts and angle combinations, and deformed bars.

In addition, in the above description of the present invention, the frame beam structure is illustrated as an example of a reinforced concrete structure (RC structure), but a steel reinforced concrete structure (SRC structure) and the like are also possible, and the structure of the beam serving as a brace for the wall of the earth is also possible. Steel structure (S structure), RC structure and SRC structure are also possible.

As can be seen from the above description, the present invention has the following effects.

Firstly, the frame beam formwork can be supported by cantilever type brackets instead of being supported by club bars, thus eliminating much time, cost, and equipment for placing, hardening, and dismantling plain concrete for supporting conventional clubs. In addition, the problem of delaying the dig process of the lower floor is solved by the existence of the copper bar until the conventional rim beam is cured, and the physical interference of various constructions due to the existence of the copper bar can be eliminated. It is much better than the conventional one, and it has the effect of shortening the air and cost of construction.

Second, the construction sequence consisting of the pre-positioning of the connecting plate in the formwork → concrete placement → hardening → joining to the connecting plate of the beam is the end arrangement of the beam with the shear connection member in the formwork → concrete placement → hardening process. This eliminates the need for post-length clearance correction, especially welded joints or weld cuts, caused by the gap between the center pile or girders and the connection plate embedded in the rim beam. none.

Third, since the construction of the beam as it is factory produced without changing, such as welding cutting or welding joint at the site can ensure the homogeneity of the member.

Claims (5)

A first step of installing the center wall along the boundary of the building and putting the center pile at the location of the column according to the plan design; A second step of installing a bracket for placing one end of the beam while supporting the first frame beam form by contacting the inner side of the retaining wall after the first destruction; A third step of erecting a first frame rib forming die on the bracket; A fourth step of placing the beam having the shear connection member fixed at one end thereof so that the shear connection member is positioned in the frame for constructing the frame beam, and fixing the other end of the beam to the center pile or the girder; A fifth step of reinforcing reinforcing bars in the first frame formwork; A sixth step of placing concrete in the formwork so that the shear connection member fixed to one end of the reinforcement and beam is integrally coupled to the retaining wall, the rim beam and the beam; And Repeating the second to sixth steps as needed; Underground structure construction method using a permanent structural member of the building, characterized in that comprises a brace as a brace The method of claim 1, The bracket is a basement construction method using a permanent structural member of the building, characterized in that the cantilever method fixed to the retaining wall as a retaining brace. The method of claim 1, The bracket is a method for constructing underground structures using a permanent structural member of the building, characterized in that supported by the copper bar as a brace. The method according to any one of claims 1 to 3, The retaining wall is an underground structure construction method using a permanent structural member of a building, characterized in that any one of the earth plate, soil cement wall, cast-in-place concrete pile, diaphragm wall A first step of installing the center wall along the boundary of the building and putting the center pile at the location of the column according to the plan design; A second step of contacting the inner side of the retaining wall to support the first edge beam formwork after the first destruction and installing a bracket foot for placing one end of the beam; A third step of erecting a formwork for forming a first frame rib on the bracket; A fourth step of embedding the beam connecting plate in the formwork and reinforcing the reinforcing bars; A fifth step of integrating the first edge rib against the retaining wall by pouring and curing concrete in the formwork; A sixth step of fixing the one end to the center pile or girder and the other end to the connection plate fixed in the rim beam for the factory-produced beam so that the retaining wall, the rim beam and the beam are integrally coupled; And, Repeating the second to sixth steps as needed; Underground structure construction method using a permanent structural member of the building characterized in that it comprises a brace as a brace.