JP2763488B2 - Prefabricated pillar and inverted ramen prefabricated construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of prefabricating a rigid-framed ramen for realizing the industrialization of formwork, reinforcing bars and concrete work, and a structure for forming a permanent pillar in the construction of an underground skeleton of a building or a civil engineering structure. About pillars.

[0002]

2. Description of the Related Art There are two methods of constructing a subway reinforced concrete underground structure: a general construction method in which excavation is performed from the ground surface to the bottom and an excavation site is cast from the excavation bottom to the top. There is a reverse construction method that builds prior to excavation and skeleton construction, constructs a temporary support in the permanent pile, and supports the framed construction body with the temporary support. The general construction method of placing a building body from the bottom of the excavation to the top is performed according to the following construction procedure. That is, between the ground surface (ground surface) and the supporting ground surface, a gantry support pile for supporting the entering gantry and a shelf pile for supporting the pier beam are constructed as a retaining wall and a temporary supporting pile. The landing gantry is used as a work floor for underground construction. Next, excavation is started by the heavy excavator on the entrance gantry surface, and a mountain retaining material (a temporary material for supporting the mountain retaining wall made of a cut beam and a belly raised temporarily on the inner plane of the mountain retaining wall) is constructed.

In this excavation, mountain retaining members are erected at predetermined intervals while sequentially excavating from the ground surface to the lowest portion (the bottom of the foundation of the building). Next, formwork and rebar are assembled on site, concrete is poured, and framed concrete is framed. The building concrete is constructed in order from the bottom, and the retaining material is dismantled in order from the bottom. When the construction of the underground skeleton is completed, the entrance gantry is dismantled, and then the temporary support pile is dismantled.

[0004] The reverse driving method of placing the frame first from the upper floor is performed according to the following construction procedure. In other words, a retaining wall and a temporary support pile are constructed, and then the first floor, the girders, small beams and pillars corresponding to the first floor are cast in place, and the first floor is used as a working floor for underground construction. I do.

[0005] In the work of arranging the main girder main reinforcement in the main pillar, the main girder main reinforcement hits the temporary support pile and cannot be arranged at a predetermined position, or the anchoring length in the main pillar is fixed. Because the main beam cannot be secured, the reinforcement of the girder is pierced through the temporary support pile, or the concrete at the joint of the main pillar with the permanent girder is increased, and the reinforcement of the girder bypasses the outer surface of the temporary support pile. .

Next, after confirming the predetermined strength of the first floor, excavation is performed to the ground corresponding to the first basement floor, and the first floor skeleton is supported by the temporary support pile. If the floor height between the first floor and the first basement floor is equal to or higher than a certain level, the ground is supported by mounting a mountain retaining material at a predetermined position between the first floor and the first basement floor.

[0007] Next, cast concrete is cast in the lower part of the first basement floor, pillars, girders, small beams, floor reinforcing bars and formwork corresponding to the first basement floor are assembled at the site, and the skeleton is cast at the site.
Next, we checked the strength of the skeleton on the first basement floor,
The rebar and formwork at the joint between the first floor and the first basement are assembled on site, and the frame is cast in place. After that, excavation is performed to the ground corresponding to the second basement floor, the lower body is excavated to a predetermined bottom, and construction is repeated to construct an underground body. Assembling of the reinforcing bar and the formwork of the seam portion and casting of concrete at the site may be performed after excavation to the bottom. In this type of reverse beating method, generally, a straight pillar is provided separately from the main pillar (the pillar of the building body).

[0008]

In a general construction method in which an underground reinforced concrete frame is cast from the bottom of the excavation to the top, a temporary structure for preventing collapse of the ground (Yamadome)
After digging to the bottom while erection, the formwork, reinforcing steel and concrete are all assembled on site from the bottom, and if the floor height (difference between floors) is small, It is possible to proceed with the skeleton construction while removing the bulging, but if the floor height is large, it is necessary to take auxiliary measures such as constructing the outer peripheral skeleton under the bulging and re-receiving it with diagonal cut beams etc. The auxiliary means has a drawback that a large amount of temporary material is required to be carried out to the ground at a later date.

[0009] In the reverse-casting method in which an underground reinforced concrete frame is cast first from the upper floor, H-shaped, B-shaped or round steel columns are used as the straight columns, and the reinforcing beams of the girders are used in the construction. If the trussed pillar is made of reinforced concrete, it is arranged so as to penetrate the hole provided in the main pillar or bypass the outside of the trussed pillar, and the trussed pillar functions only for temporary use. Because the girder is used to assemble the formwork and cast concrete, the support members that support the formwork cannot be dismantled until the required strength of the cast concrete is achieved, and
There is a problem that the material for formwork must be raised each time.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and the main members of a trussed pillar are concentrated on the corners of the trussed pillar so that the main members of the trussed pillar can be installed on the main pillar (after the completion of construction). The pre-casting method of the reverse-bent ramen prefabricated method, which enables it to function as the main reinforcement of the column that actually supports the weight of the structure) and makes the girders made of precast concrete, enabling the construction following the excavation It is an object of the present invention to provide a straight pillar that secures a space for reinforcing bars of a main beam at a beam-to-column connection.

[0011]

The pillar according to the present invention is:
In the underground skeleton of a reinforced concrete structure, it is a straight pillar that supports the end of the girder that supports the floor structure, and is disposed along the longitudinal direction of the girder and penetrates the straight pillar in a straight line. A main timber pillar is disposed at a position that does not interfere with a main girder bar group connecting the girders whose ends are supported by the timber columns, and the main timber members are spaced from each other in the longitudinal direction of the timber columns. A stiffener for fixing the main members of the straight columns is fixed, and a support frame for receiving an end of a precast concrete girder is fixed to a predetermined one of the stiffeners.

[0012] Further, the reverse prefabricated ramen prefabrication method of the present invention is used for constructing a reinforced concrete underground frame.
Build a retaining wall and a permanent pile on the ground surface, insert a timber pillar into the permanent pile, and attach a support frame to the part corresponding to the first floor of the retaining wall and the timber pillar so that they are located in the same horizontal plane ,
Precast concrete girders are arranged so as to bridge the retaining wall and the support frame provided on the timber columns, and the stirrups of the main columns are installed in the area corresponding to the first basement floor on the outer periphery of the main members of the timber columns. Reinforcing the girder, assembling the formwork of the capital of the column corresponding to the first basement floor of the reverse striking part, holding the formwork of the capital of the capital with the stiffening part of the column, The formwork is assembled, an opening is provided in a part of the first floor, the first floor is laid, and concrete is applied to the column head formwork, the girder and the first floor formwork of the reverse hitting portion. Set up columns, beams and 1
A floor is formed, and then excavation is performed up to the first basement floor using the opening of the first floor, and the excavation is located in the same horizontal plane at a site corresponding to the first basement floor of the retaining wall and the straight pillar. A precast concrete girder is installed so as to bridge the retaining frame and the supporting frame provided on the timber column, and the main frame is located in the area corresponding to the second basement floor on the outer periphery of the main member of the timber column. Assemble the stirrups of the pillars, arrange the girders, and assemble the formwork of the column cap corresponding to the second basement floor of the reverse striking section. Hold it, assemble the floor formwork on the first basement floor,
An opening is provided in a part of the floor, reinforcement of the first basement floor is performed, concrete is poured into the column head formwork, the girder, and the first basement floor formwork of the reverse hitting part, After the beams and the first basement floor are formed, concrete is poured into the formwork from the capital to the column base of each floor.

[0013]

According to the present invention, there is provided a timber column having a main timber column at a position where it does not interfere with the main beams of the girder, and a support frame for receiving an end of the precast concrete girder at a predetermined stiffener. As a result, the precast concrete girders are immediately erected between the timber columns after the timber columns are erected, and the main beams connecting the girders are not interfered with the timber members. It can be penetrated and arranged linearly. Thus, the main beams of the girder penetrate the main member of the timber column and the strength of the main member of the timber column is reduced, so that it is possible to avoid the complexity of the construction in which the timber column must be reinforced inevitably. Or, compared to the case of arranging the girder main reinforcement so as to detour the main timber pillar, it is possible to avoid the complexity of the rebar arrangement work and the increase in cast-in concrete and formwork by bypassing the girder main reinforcement. it can. Here, the “position that does not interfere with the girder main bar group” of the main pillar main member is, as described later, specifically, in the case of a square pole with a rectangular cross section, at each corner of the square. Yes, if it is a straight column with a polygonal cross section, it is a reasonable position that does not interfere with the main beams of the girder and that exerts its function as a strength member of the column that receives weight, such as at each corner of the polygon It is.

[0014] The method of the present invention,
By concentrating the structural members of the trussed pillars at predetermined positions, the structural members of the trussed pillars also function as column main reinforcements, and the use of precast concrete girders reduces the loading and unloading of form materials. Thus, the waiting time until the concrete strength is developed can be reduced.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. Fig. 1 shows a straight pillar 1 used in the reverse prefabricated ramen prefabricated construction method of the present invention. The straight pillar 1 has an L-shaped cross section disposed at a predetermined position of a main pillar to be formed by concrete casting. Main pillar 2 made of steel and pillar hoop 3 wound around the outer surface of the main pillar 2 (FIG. 3)
And a truss which is arranged on the inner surface of the truss main pillar 2 at predetermined intervals in the longitudinal direction of the truss main pillar, and which is welded to the truss main pillar 2 so as to join the truss main pillars together. And a column stiffener 4.

Here, the predetermined position of the main column 2 of the main pillar is a corner if the main pillar is square, and a corner if the main pillar is polygonal. If the pillar is circular, it is a position that exhibits a circular shape as a whole. In other words, the main beam main bar connecting the girders whose ends are supported by the vertical beam column 1 is inserted linearly, and the vertical beam main member 2 is used as a strength member of the main column receiving the weight of the structure. A reasonable position that can function.

A stiffener 4 provided on the main beam 2 of the beam 1
Is for preventing buckling of the main shaft 2 and maintaining the planar shape thereof.
Is fixed to the permanent pile 5 (FIG. 4). The permanent pile 5 is formed by ordinary means such as a cast-in-place concrete pile. For example, a pile reinforcing rod is inserted into a pile drilling hole formed by excavating the ground, and thereafter, the pile drilling hole is formed. Concrete is poured into the pile, and the concrete pillar 1 is inserted into the pile drilling hole before the concrete hardens, and the concrete pillar 1 is fixed at a position below the upper end face of the pile concrete. Fixing of the straight pillar 1 to the permanent pile 5 is performed by hardening concrete.

The main pillar 2 shown in FIG. 1 has an L-shaped cross section, but the main pillar 2 may have a U-shaped cross section or a U-shaped end if necessary. Further, it may be a channel shape bent and formed inward. Also. It is preferable that the upper end of the trussed pillar 1 protrude upward from the first floor to a predetermined position in consideration of the anchoring length of the pillar main bar on the upper floor.

On the other hand, the straight pole 1 fixed to the permanent pile 5
As shown in FIG. 3, support frames 6, 6,... The support frame 6 receives the lower surface of one end of the precast concrete girder 7 intersecting with the timber pillar 1, performs inking at a predetermined position of the girder mounting level at the site, and attaches the L-shaped outer surface of the support frame 6 to the girder. It is fixed to the column stiffener 4 according to the level. At this time, the alignment of the shift of the girder 7 is performed by putting the shift of the girder 7 on the support frame 6 and aligning the shift with one of the beam side surfaces of the girder 7 to determine the position.

The mounting position of the support frame 6 on the vertical column 1 is as follows.
Precast concrete girder 7 supported by support frame 6 to form the first floor of the building to be constructed
Is determined by the height of The reinforcement of the beam main reinforcement at the joint between the trussed pillar 1 and the girder 7 may be a U-shaped cross-section that fills the internal space with concrete after erection, or a conventional girder (a girder formwork or reinforcement In the case of a precast girder made in a factory or the like, the girder main bar 9 and the girder are arranged in order to arrange the main girder reinforcement 9 between the timber columns. The main line 9 does not cross.

That is, as shown in FIG. 3, the main beam 9 of the girder is provided on the upper surface of one of the girder 7 opposite to the other by inserting the stirrup 8 of the girder provided on the upper surface of the other girder 7. A predetermined number of studs are arranged so as to penetrate the stirrups 8 of the girders. However, one end of the opposing girders 7 is supported by the supporting frame 6 arranged on each surface of the straight beam column 1. The main beam 9 is inserted from two directions and intersects in the space of the straight pillar 1. In this case, as shown in FIG. 2, the timber column main member 2 is arranged at the corner of the timber column 1, so that the timber column main member 2 does not cross the main beam 9.

As shown in FIG. 3, a column formwork 10 is arranged around a portion corresponding to the first floor of the building with the straight pillar 1 and a portion below the same. The first floor formwork 11 is arranged so as to surround the upper surface of the first floor. The column formwork 10 and the first-floor formwork 11 are arranged at the work site in the same manner as the main beam 9. The constructed first floor is shown in FIG.

Next, a description will be given of the working procedure of the reverse beating ramen prefabrication method of the present invention. First, the pillar 1 is constructed. This straight pillar 1 is used for fixed loads such as the frame of the reverse hitting part (1st floor and beam, 1st basement column, 1st floor and beam, 2nd floor basement, rebar such as column part in pressure resistant version) It is made of a member that takes into account the weight of the trussed pillar and the load applied to the floor of the underground part, the load imposed on the floor of the underground part, the impact load and the work load, and the temporary load due to the retaining material.

Next, as shown in FIG. 5, a mountain retaining wall 21 extending from the ground surface 20 to the ground is constructed, and a permanent pile excavation hole 22 is excavated below the ground surface 20, and the permanent pile excavation hole 2 is formed.
A reinforced steel cage (not shown) of the permanent pile 5 is inserted into 2, and then concrete is poured from the tip of the permanent pile 5 to a predetermined height 23. In this case, after confirming the position of the head, the level of the straight pillar, the deviation, etc., of the head, the fixed pillar is fixed by a fixture (not shown). The framed pillar 1 is held at that position by backfilling. In FIG. 5, reference numeral 24 denotes a final excavation surface.

Next, as shown in FIG. 6, in order to construct the first floor of the building, the first basement portion is excavated from the ground surface 20 to the first excavation surface 25, and the first floor portion is excavated. Build a skeleton. In the construction of the frame on the first floor, the supporting frames 6 are respectively attached to the surfaces of the straight columns 1 and the inner surface of the retaining wall 21 so as to be located on the same plane, and the precast concrete girders 7 are provided on the retaining wall 21. The supporting frame 6b and the supporting frame 6 provided on the truss pillar 1 are arranged so as to bridge them.
6 are arranged so as to bridge each other.
By disposing the outer precast concrete girder 7b on the support frame 6b provided in the above, the arrangement of the girder 7 in the portion corresponding to the first floor is completed.

When the arrangement of the girders 7 is completed, the girders 7
The main beam 9 and the column hoop 3 are arranged, and the first-floor formwork 11 and the column capital column formwork 10 below the first-floor floor of the structural column 1 are arranged so as to surround the girder 7 (FIG. 3). When the arrangement of each member is completed, small beams and floor reinforcing bars (not shown) are arranged, piping such as equipment is arranged, and then the first floor floor form 11 and the column form 10) are not shown. Concrete is poured into the girder formwork and the small beam formwork. Thereby, a portion corresponding to the first floor 26 and the first floor of the truss pillar 1 is constructed.

Next, as shown in FIG.
Underground 2 to secondary excavation surface 27 to build floor
Excavation of the floor part will be carried out to build the skeleton of the first basement floor part.
In the construction of the skeleton on the first basement floor, as in FIG.
The supporting frame 6 is provided on the surface of each straight pillar 1 and the inner surface of the retaining wall 21.
c, and the girder 7a is arranged so as to bridge the support frame 6c of the retaining wall 21 and the support frame 6a of the vertical beam column 1. Then, the support frames 6a, 6a provided on the opposite vertical beam column 1 are connected to each other. Then, by arranging the outer peripheral girder 7a on the support frame 6a of the retaining wall 21, the arrangement of the girder 7a in the portion corresponding to the first basement floor is completed.

After the arrangement of the girder 7a is completed, the girder main reinforcement 9 and the column hoop 3 of the girder 7a are arranged, and the first basement floor form frame 11a and the first basement floor of the trussed column 1 surround the girder 7. The other capital part column formwork 10a is arranged (FIG. 8). When the arrangement of each member is completed, small beams and floor reinforcing bars (not shown) are laid, piping such as equipment is arranged, and then the basement floor formwork 11a and the column formwork 10a are shown. Pour concrete into large or small beam formwork. Thus, a portion corresponding to the first basement floor 28 and the first basement floor of the trussed pillar 1 is constructed. In the same manner, the construction of the floor and the structural pillar 1 up to the predetermined floor is performed.

FIG. 8 shows the final excavation stage. In this final excavation stage, a foundation frame including the pressure-resistant plate 30, the foundation footing 31, the foundation beam 32, and the floor slab 33 is constructed.

FIG. 9 shows an example in which the trussed pillar 1 is used as a column of a landing gantry when constructing a reinforced concrete underground skeleton. In this case, the configuration of the trussed pillar 1 is the same as that of FIG. is there.

In order to use the trussed pillar 1 as a column of the entrance gantry, a permanent pile excavation hole is excavated below the ground surface, and the reinforcing pile cage 5b of the permanent pile is inserted into the permanent pile excavation hole. , This rebar basket 5b
Is fixed in place. Next, the straight pillar 1 is inserted into the permanent pile drilling hole, and concrete is poured into the permanent pile drilling hole, so that the insertion side end of the straight pillar 1 is embedded and fixed in the permanent pile. Then, when the strength of the concrete of the permanent pile reaches a predetermined strength, earth and sand or the like is buried back in the excavation hole of the permanent pile to prevent the displacement of the straight pillar 1. The head of the trussed pillar 1 is set to have a length protruding above the ground surface, and the protruding part of the trussed pillar 1 and the protruding part of the trussed pillar 1 adjacent to this protruding part are connected by a horizontal joint 40. They are connected to each other by a vertical brace 41. In this embodiment, the trussed pillar 1 is made to function as a temporary support pillar or a main reinforcement of the permanent pillar.

A lower spar 42 is bridged between the projecting portion of the truss column 1 and the protruding portion of the truss column 1 adjacent to the protruding portion. Upper girders 43, 43 extending in a direction perpendicular to the longitudinal direction are bridged. Then, the lining plate 44 is laid without gaps on the bridges 43, 43 that have been bridged.

As described above, the straight pillar 1 used for the permanent pile
By using the pedestal for the gantry support, there is no need to place it at the position avoiding the permanent pile unlike the conventional gantry stanchion, so working space is secured and the wall,
Alternatively, it does not penetrate the main floor and does not hinder the underground skeleton.

[0034]

As described above, according to the present invention, in the construction of an underground reinforced concrete underground frame, a precast concrete giant beam is used, so that the straight columns can be used as the permanent beams and the temporary columns can be used as the temporary structures. By making it function as an object, it is not necessary to use a retaining material as in the conventional construction method, which reduces the loading and unloading of formwork materials, and reduces the waiting time until concrete strength is realized. Import and export of materials and erection and dismantling work can be omitted. Further, the main member of the timber column functions as a column main bar, and the main beam main bar can be easily arranged at a predetermined position in the main column without hitting the main member of the timber column.

[Brief description of the drawings]

FIG. 1 is a view showing an arrangement of a straight pillar and a precast concrete girder used in the reverse prefabricated ramen prefabrication method of the present invention according to the present invention.

FIG. 2 is a diagram showing the first-floor portion of a timber pillar and a precast concrete girder, and the arrangement of reinforcing bars on each floor.

FIG. 3 is a diagram showing a first-floor concrete placing stage of the reverse-casting ramen prefabrication method of the present invention according to the present invention.

FIG. 4 is a diagram showing a first-floor construction part of the reverse-bent ramen prefabrication method of the present invention according to the present invention.

FIG. 5 is a diagram showing a first stage of the reverse beating ramen prefabrication method of the present invention according to the present invention.

FIG. 6 is a view showing a second stage of the reverse beating ramen prefabrication method of the present invention according to the present invention.

FIG. 7 is a view showing a third stage of the reverse beating ramen prefabrication method of the present invention according to the present invention.

FIG. 8 is a diagram showing the final stage of the reverse beating ramen prefabrication method of the present invention according to the present invention.

FIG. 9 is a diagram showing an example in which the truss post 1 is used as a column of a landing gantry.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 construction pillar 2 construction pillar main material 4 construction pillar stiffening material 5 permanent pile 6 support frame 7 precast concrete girders 10 pillar formwork 11 1st floor formwork 20 ground surface 21 mountain retaining wall 26 1st floor 28 1st floor underground

Claims (2)

(57) [Claims] 1. An underground skeleton of a reinforced concrete structure, comprising: a straight pillar for supporting an end of a girder supporting a floor structure, wherein the straight pillar is disposed along the longitudinal direction of the girder and has a straight structure. The main timber pillar is disposed at a position where it does not interfere with the main girder group connecting the girders whose ends are supported by the timber columns. A stiffener for fixing the main members of the trussed pillars is fixed at intervals in the direction, and a support frame for receiving an end of a precast concrete girder is fixed to a predetermined one of the stiffeners. Pillar pillar. 2. In the construction of an underground skeleton made of reinforced concrete, a retaining wall and a permanent pile are constructed on the ground surface, and a timber pillar is inserted into the permanent pile to correspond to the first floor of the retaining wall and the timber pillar. Attach a support frame so that it is located in the same horizontal plane, place a precast concrete girder so as to bridge the retaining wall and the support frame provided on the timber column, Attach the reinforcement of the main column to the area corresponding to the first floor, arrange the girders, and assemble the formwork of the column cap corresponding to the underground first floor of the reverse striking part. Holding the form of the capital part in the part, assembling the first floor formwork, providing an opening in a part of the first floor,
Reinforcing the floor of the first floor, placing concrete in the column head formwork, the girder and the first floor formwork of the reverse hitting portion to form columns, beams and the first floor, Using the floor opening, excavation is performed up to the first basement floor, and a supporting frame is attached to the part corresponding to the first basement floor of the retaining wall and the timber column, so that it is located in the same horizontal plane, and a precast concrete girder Are arranged so as to bridge the retaining wall and the support frame provided on the timber column, and assemble the stirrups of the main column in the area corresponding to the second basement floor on the outer periphery of the main member of the timber column. Perform the reinforcement and assemble the formwork of the capital that corresponds to the second basement floor of the reverse striking part, hold the formwork of the capital with the timber stiffening part, and assemble the basement floor formwork To provide an opening in a part of the first basement floor, to arrange the reinforcement of the first basement floor, And Da設 the concrete to the stigma part mold frame and girders and the first basement floor mold parts, columns, beams and underground 1
A reverse precast ramen prefabrication method in which concrete is poured into a formwork from the capital to the column base of each floor after the floor is formed.