JP7330646B2 - Sliding method for Rahmen structures - Google Patents

Description

TECHNICAL FIELD The present invention relates to a slide construction method applied when constructing a rigid-frame structure.

The slide construction method is sometimes adopted as a construction method for constructing a long structure such as a platform shed of a railway station or a storage shed for coal and the like. The slide construction method is said to be efficient in construction, as it is possible to assemble the partial frames at the assembly site, attach finishing materials, etc., and send them out in order when the girder lines of these buildings are long.

In many cases, the span direction of the structure is a Rahmen structure. Bending moments _M1 and _M2 are generated as shown in the figure, and a horizontal reaction force H is generated in the column base to counter the force that tends to kick the column to the outside (hereinafter referred to as column base horizontal force). Its size increases as the span dimension of the Rahmen frame increases.

Conventionally, when erecting such a Rahmen structure by the slide construction method, sufficient horizontal rigidity and sufficient horizontal rigidity to support the horizontal force of the column base are required so that the partial frame is structurally stable even during sliding movement. A strong foundation was required.

Further, as the slide rail, in addition to the rail for receiving the vertical load, a horizontal force receiving rail for directly receiving the horizontal force of the column base and transmitting the force to the foundation was required.

Furthermore, due to the horizontal force of the column base portion, the column base portion slides while being pressed against the horizontal force receiving rail, which generates a frictional resistance force. There was also the problem of becoming This problem becomes more significant the longer and heavier the partial frame to be towed.

As described above, in the conventional slide construction method, in addition to the cost of installing the foundations and horizontal force receiving rails for handling the horizontal force of the column base, it was necessary to consider the capacity enhancement and cost increase of the traction equipment.

In addition, since the horizontal force of the column base portion, which tends to spread outward, always acts on the horizontal force receiving rail even during the sliding movement, sufficient safety measures are required.

As a method of suppressing the horizontal force on the column base of the partial frame during sliding movement, for example, a tension member is horizontally provided to connect the column bases of both side columns in the span direction, and tension is introduced to the column base. It is possible to consider a construction method that balances the large horizontal force that tries to open horizontally. In this case, if there is an existing object higher than the height of the tension material connecting both column legs, it cannot be applied because it interferes. Since it is necessary to keep it for all the column bases until then, a large amount of temporary construction costs are required in addition to the traction equipment.

In the slide construction method for a rigid-frame frame, there is an invention described in Patent Document 1, for example, as a prior art related to coping with the horizontal force of the column base.

The invention described in Patent Document 1 is the following construction method. Assemble the gate-shaped partial frame of the first slide by temporarily supporting both ends of the roof beams and the pillars in a pin-jointed state. After installing the roof finishing etc., members are added to both ends of the roof beams to complete the Rahmen frame. The gate-shaped partial frame, which is a rigid-frame frame, is slid on slide rails by a traction device.

Next, in the space vacated by the sliding movement, a new gate-shaped partial frame is temporarily received and assembled by pin-joining both ends of the roof beams in the same manner as the first time, and the sliding gate-shaped partial frame is assembled. are assembled in a pin joint state, and jacked down in that state.

After that, the roof finish is installed, members are added to both ends of the roof beams of the new gate-shaped partial frame to form a rigid frame, and the roof members that connect the slide and the new gate-shaped partial frame are installed. Tighten and unite. Then, the entire gate-shaped partial frame is slid for the second time by the pulling device.
A slide construction method for a large span frame is disclosed in which the above procedure is repeated a required number of times.

According to this slide construction method, the column base horizontal force generated by the beam's own weight does not occur during the slide movement, so that the conventional problem is solved.

In this method, in the assembly of the gate-shaped partial frame, both ends of the roof beam and the pillar are jacked down in a pin-connected state, and after installing finishing materials for the roof, etc., both ends of the roof beam of the gate-shaped partial frame are mounted. Add a member to make it self-supporting as a rigid frame. In other words, before the Rahmen frame is completed, a vertical load is applied when the beam is in a simple beam state. (heavier), and this tendency is more pronounced as the span dimension is longer.

In a Rahmen structure frame, the beams and columns are rigidly connected, so the maximum bending moment generated in the members is smaller than when both ends of the beams are connected with pins, so the member size can be reduced. can do. However, the invention described in Patent Literature 1 has a problem that the advantage cannot be exhibited and the cost increases at the cost of not generating the column base horizontal force generated by the beam's own weight.

In addition, when the partial frames are connected and lengthened, the weight to be towed becomes heavy, so there is also the problem that a towing device with a large capacity is required.

Patent No. 6636091

The present invention relates to a slide construction method, which is often used as a construction method for structures with rigid-frame structures extending in the span direction and having long girder rows. To provide a rigid-frame structure slide construction method that does not generate a horizontal force on a column base of a partial frame and that is sufficient even if the capacity of a traction device is small.

A first means of the present invention for solving the above-mentioned problems is a slide construction method for rigid-frame structures,
1) A step in which a gantry for assembling the partial frames of the Rahmen structure is installed at a specific assembly position so as to be movable on slide rails.
2) The partial frame assembled on the gantry installed at the assembling position shall be mounted on the slide rails with the girders supported by the gantry and the column bases of the partial frame floating in the air. is transported to a predetermined position.
3) A process in which the partial frame that has been transported to the predetermined position is jacked down to release support from the gantry, and the column bases are fixed on predetermined foundation columns to stand on their own.
4) When the column base of the partial frame of the Rahmen structure is jacked down, before the column base is placed on a predetermined foundation column, the deviation from the correct installation position of the column base is caused by the column base. A step of correcting by applying a horizontal force to the column base portion in the outward direction by a position adjusting means connected between the column and the gantry .
It is characterized by including the above steps.

As described above, according to the means of the present invention, since the column bases of the partial frame are suspended in the air during the sliding movement, no horizontal force is generated on the column bases. The traction device does not require a large capacity because it can be the smallest self-supporting unit.

A second means of the present invention is a slide construction method for rigid-frame structures,
1) A step in which a gantry for assembling the partial frames of the Rahmen structure is installed at a specific assembly position so as to be movable on slide rails.
2) The partial frame assembled on the gantry installed at the assembling position shall be mounted on the slide rails with the girders supported by the gantry and the column bases of the partial frame floating in the air. is transported to a predetermined position.
3) Before jacking down the partial frame that has been transported to the predetermined position, a new gantry for assembling the next partial frame is installed at the specific assembly position, and the next partial frame is assembled. .
4) The next partial frame is transported to a predetermined position on the slide rails with its column base suspended in the air like the previous partial frame, and is connected to the previously transported partial frame. The process of being integrated.
5) A step in which steps 3) to 4) are performed at least once.
6) A step of jacking down all of the connected and integrated partial frames that have already been transported so that the support by the gantry is released, and all of the column bases are fixed on predetermined foundation columns to stand on their own.
7) When the column base of the partial frame of the Rahmen structure is jacked down, before the column base is placed on a predetermined foundation column, the deviation from the correct installation position of the column base is caused by the column base. A step of correcting by applying a horizontal force to the column base portion in the outward direction by a position adjusting means connected between the column and the gantry .
A slide construction method for a rigid-frame structure is characterized by including the above steps.

As described above, according to the second means of the present invention, as with the first means, no horizontal force is generated on the column base of the partial frame during sliding movement.

Further, in the first means of the present invention, the preceding partial frame is transported to a predetermined position, jacked down, its column base is fixed and becomes self-supporting, and the gantry on which the support of the partial frame is released is placed at a specific position. Although the next partial frame cannot be assembled at that specific assembly position (hereinafter referred to as the "specific position") until it is returned to the second means, the next partial frame can be assembled during that time. becomes possible.

Further, in the slide construction method for a Rahmen structure according to the present invention, before the column bases of the partial frame of the Rahmen structure are placed on the predetermined foundation columns during jacking down, the column bases are accurately adjusted. A step in which any deviation from the correct mounting position is corrected using the position adjustment means. When jacking down, before the column base of the partial frame is placed on a predetermined foundation column, the column base and the gantry are installed in order to correct the deviation from the correct installation position of the column base. A position adjusting means (device) temporarily installed between and can apply a horizontal force to the column base to correct the position to an accurate position.

Each gantry which is arranged in a row in the span direction of the partial frame so as to face each other may be independent from each other. In that case, as a temporary reinforcement against horizontal forces such as earthquakes in the direction perpendicular to the slide that may act during the slide movement, a reinforcing member that connects the large beam part of the partial frame and a part of each gantry (for example, the lower end) is installed.

As another method of reinforcing the gantry in the direction perpendicular to the slide, the gantry may be integrated by connecting them with a structure such as a truss beam.

The method of slidingly moving the gantry may be determined in consideration of various conditions at the construction site, such as a wire rope winding method using a winch or a measuring method using a hydraulic jack.

In addition, as a partial frame to be transported by a single slide, if it is the minimum unit that can stand alone as a frame, the weight to be towed is light, so a large capacity of the towing device is not required.

INDUSTRIAL APPLICABILITY As described above, the present invention provides the following effects by incorporating a gantry that can move on slide rails in the slide construction method for rigid-frame structures.

(1) During the slide movement, the support points of the partial frame are provided on the large beams and the column bases are suspended in the air. High safety during slide movement.

(2) Since no horizontal force is generated on the column base during sliding movement, there is no need to reinforce the slide foundation that receives the horizontal force, and the cost for this can be reduced.

(3) Since the column base of the partial frame is in a state of being suspended in the air, when the column base is placed on the predetermined foundation column, it is easy to use the temporarily installed position adjustment means (device). It is possible to correct any deviation from the correct installation position.

(4) The partial frame to be transported by one slide may be a minimum unit that can stand alone as a frame after jacking down, so it is light in weight and does not require a large-capacity traction device.

(5) Since the pillar bases are slid while floating in the air, each pillar can be installed at a predetermined position even if the pillars lined up in the girder direction of the building are not parallel to the sliding direction. .

1 shows an example of temporary equipment arrangement at a construction site in an embodiment of the present invention, where (a) is a plan view showing the situation immediately before the start of sliding of the first partial frame 3, and (b) is the first partial frame 3. 2 is a plan view showing a situation in the process of pulling back the gantry 2 after the gantry 2 becomes independent. FIG. 10 is a plan view showing how the second partial frame 3 and the first partial frame 3 are connected in the embodiment of the present invention; FIG. In the embodiment of the present invention, after the preceding partial frames 3, 3 have become independent, the gantry 2 is a diagram showing a situation in the middle of being pulled back, (a) is a plan view, (b) is an X- It is an X cross-sectional view. FIG. 10 is a diagram for explaining another procedure for sliding in an embodiment of the present invention. (a) shows the situation immediately before the start of sliding of the second partial frame 3 assembled by the new gantry 2, ( b) is a diagram showing a situation in which two connected gantrys 2 are pulled back to the vicinity of a specific position S. FIG. It is a cross-sectional view of the slide orthogonal direction in the embodiment of the present invention, (a) shows the reinforcement method of the span direction of the gantry 2 by braces, (b) is a cross-sectional view of (a), (c) It is a cross-sectional view of (a). FIG. 5B is a cross-sectional structural diagram in the direction orthogonal to the slide, showing a gantry reinforcing method different from that of FIG. 5A in the embodiment of the present invention. In FIG. 5(a), it is a structural drawing when the girders G of the partial frame 3 are mountain-shaped. FIG. 4 is a cross-sectional structural diagram in the slide orthogonal direction in the embodiment of the present invention, and is an explanatory diagram when sliding a partial frame 3 with two spans in the span direction. FIG. 2 is a diagram showing a frame model and load conditions used for structural analysis, as an example of a frame frame in which a girder G is supported by support points A, A; Fig. 9 shows the analysis results of the frame model of Fig. 9, where (a) is a bending moment diagram, (b) is a displacement diagram, and (c) is a bending moment diagram and reaction force when the horizontal movement of the lower end of the column is constrained. (a) shows a frame model in which a vertical load w is applied to the beams of a rigid-frame frame supported by column base pins; 4 is a diagram showing a partial reaction force H; FIG.

A first embodiment of the present invention will be described with reference to FIGS. 1 to 5. FIG. In FIG. 1, at a construction site of a building, temporary slide rails (one set of two rails) 1, 1 are laid, and gantry 2, 2 capable of moving independently on the slide rails is placed at a specific position S of a partial frame 3. It is a layout diagram showing how it is installed. A partial frame 3' indicated by a dashed line in the drawing indicates a predetermined position where the first partial frame 3 is slid and installed.

The gantry 2, 2 can move back and forth on the slide rails 1, 1 by winding the wire ropes 4, 4 with drums 5a, 5a (5b, 5b) of a winding device (winch).

As shown in FIG. 5, the partial frame 3 is composed of a rigid-frame frame F composed of a large beam G and two columns C on three sides, small beams g, g, . . . It consists of braces v, v, ... etc. arranged in the plane of the wall surface. In actual construction work, secondary members such as furring strips and finishing materials are often attached, but they are omitted in this example.
In the figure, f, f, . . . indicate foundation pillars on which pillars C, C, .

In this embodiment, the procedure for carrying out the slide construction is as follows.
1) As shown in FIG. 1, straddle the shorings 2a, 2a of the gantry 2, 2 installed at a specific position S (see FIG. 5(a)), and girders G of the Rahmen frame F on three sides are supported at two support points A, A (first) partial frame 3 is assembled. At this time, the column bases (column bottom ends) of the columns C, C, . 5).

2) The gantry 2, 2 on which the partial frame 3, on which each girder G is supported by two support points A, A, is slid by winding the wire ropes 4, 4 on the drums 5a, 5a. It is transported on rails 1, 1 in the direction of the arrow (see FIG. 1(a)) to a predetermined position (broken line partial frame 3').

3) At a predetermined position, the partial frame 3 is jacked down to release support from all supporting points A, A, . placed and fixed by anchor bolts to stand on its own (see FIG. 1(b)).

Before the column bases of the columns C, C, . . . are placed on the predetermined foundation pillars f, f, . By applying an outward horizontal force to the column bases by the positioned adjusting devices 6, 6 (see FIG. 5(a)), deviation from the correct installation position is corrected.

A specific example of the above horizontal force will be described later. Anchor bolt holes (not shown) in the base plate of the column base are made large in advance, the anchor bolts are inserted, and after the column base is placed on f, f, . . . A conventional method of welding a washer plate covering the bolt holes to the base plate is also possible.

4) After the partial frame 3 is fixed on the foundation pillars f, f, . is moved in the direction of the arrow (see FIG. 1(b)) on the slide rails 1, 1 to a specific position S for assembling, and then pulled back.

5) Using the gantry 2, 2 returned to the specific position S, the next partial frame 3 is assembled in the same procedure as above, slid in the direction of the arrow (see FIG. 2), and jacked down to Installed in place.

6) Connect the connecting portion 3a to the partial frame 3 that was installed in advance with small girders g, g, . An aerial work vehicle or the like may be used for the member mounting work of the connecting portion 3a.

7) After the two partial frames 3, 3 are integrated and become independent, the gantry 2, 2 again moves along the slide rails 1, 1 in the direction of the arrow (Fig. 3 (a ), see (b)) and pulled back.

The above procedure is repeated until the last partial frame. 5b et al.) are removed.

In the above description, the partial frames 3 are jacked down one by one. However, for example, two or more partial frames 3 may be connected and then jacked down. That is, referring to FIG. 4(a), when the partial frame 3 (indicated by the solid line at the right end of the figure) that has been transported to a predetermined position is in a state before being jacked down, a new gantry 2 is placed at a specific position S. , 2 to assemble the next partial frame 3, which is towed by a wire rope 4 in the direction of the thick arrow in the same figure, to a predetermined position next to the transported partial frame 3 (indicated by the broken line), as indicated by the broken line arrow. , the two partial frames 3, 3 are connected by girders g, g, . . . , and then integrally jacked down.
In FIG. 4, two partial frames 3 are integrated, but three or more may be connected and integrated, and then jacked down.

The gantry 2, 2, which has been jacked down and released from the support of the two independent partial frames 3, 3, is connected and pulled back together in the direction of the arrow (see FIG. 4(b)) to the vicinity of a specific position S. .

In the above procedure 3), before the column bases of the columns C, C, . . . are placed on the predetermined foundation pillars f, f, . , which involves the specific challenges of the method according to the invention. Description will be made below with reference to FIGS. 9 and 10. FIG.

Fig. 9 shows a frame model for analysis in which a large beam G of a rigid-frame frame F on one structural surface is vertically supported by two support points A, A, and the lower ends of columns C, C are suspended in the air (left-right symmetry). ) is shown. On the girder G, a uniformly distributed load (girder's own weight) wg and a nodal point load Pg including secondary members and finishing materials are applied. , and the finishing material is attached, and the uniformly distributed load wc including the column's own weight is the vertical load.

In this state, the lower ends of the columns C and C are displaced δh inward in the horizontal direction. , it is necessary to apply a horizontal force P to the base of the column in an outward direction to push the displacement δh back to zero.

Here, as an example, a calculation example of how much the displacement δh and the horizontal force P required to push it back to zero will be shown. Calculation conditions are assumed as follows in FIG.
Beam length s = 19.115m, column length h = 9.015m
Girder G: H-900×300×16×32
wg = 3.04kN/m (large beam dead weight), Pg = 5.65~15.21kN (secondary member + finishing material)
Column C: □-550×550×32, wc=7.17kN/m (column dead weight + secondary member + finishing material)

Calculation results are shown in FIGS. 10(a) to 10(c). (a) is a bending moment diagram, and (b) is a displacement diagram. Also, (c) is a bending moment diagram when the horizontal movement of the lower end of the column is constrained in order to obtain the horizontal force P when the displacement δh of the column base is pushed back to zero. From (b), the horizontal displacement of the bottom end of the column is δh=19.6 mm. Also, from (c), it can be seen that the horizontal force required to push the displacement δh back to zero is P (=124 kNm/9.015 m)≈13.8 kN.

From the above example, the horizontal displacement δh (=19.6mm) of the lower end of columns C and C and the magnitude of the horizontal force P required to push it back to zero (≈13.8kN) are not so large. I understand. Therefore, with this level of horizontal force P, even if the reaction force is received at the feet of the vent struts 2a, 2a at the same height as the lower ends of the columns C, the legs of the vent struts 2a, 2a slide. Power can be safely transmitted to the ground via the rails 1,1.

5(a) and 5(b), one support point A is supported by one vent post 2a, and the support point A on the side of the slide rail 1 on one side is supported by one vent strut 2a. (three places in FIG. 5) are connected to each other by connecting members b, b, . . . and braces v, v, .

Moreover, in order to ensure resistance against the seismic horizontal force in the direction perpendicular to the slide, reinforcing braces 7, 7 are spanned over the support points A, A of the girders G and the bottoms of the vent struts 2a, 2a. This is a simple temporary reinforcement method using the permanent girders G.

As another method of securing the resistance force in the direction perpendicular to the slide, for example, as shown in FIG. It is conceivable to use a sufficiently stable truss frame. In this case, since it is possible to move between the gantry 2, 2, it can also be used as a scaffolding for assembling the partial frame 3.

As described above, the gantry 2 of the present invention uses the vent struts 2a that are assumed to be used repeatedly, so dismantling and assembly are easy, and temporary construction costs are low.

In the above examples, the girders G of the Rahmen frame F were horizontal. However, for example, as shown in FIG. Since it tends to spread outward due to its own weight, it is preferable to install a tie bar 8 connecting the support points A, A in order to suppress it.

Moreover, FIG. 8 shows a case where the Rahmen frame F is continuous for two spans, and shows a structural diagram in the direction perpendicular to the slide. A pair of slide rails 1, 1 and a gantry 2, 2 are provided in each span. In this case, it is necessary to operate the gantry 2, 2, .

The present invention has a Rahmen structure in the span direction, for example, when the slide construction method is adopted as a construction method for a structure with a long girder line, such as a platform shed of a railway station. There is no horizontal force that kicks outward from the column base during slide movement, and the capacity of the traction device can be reduced, improving safety and reducing foundation construction costs and equipment costs. can contribute.

1: slide rail 2: gantry 2a: shoring (vent strut)
3, 3': Partial frame 3a: Connecting part 4: Wire rope 5a, 5b: Drum 6: Position adjustment device 7: Reinforcement brace 8: Tie bar 9: Platform A: Support point C: Column F: Ramen frame G: Large beam H : Horizontal reaction force P: Horizontal force S: Specific position S (specific assembly position)
T: truss beam b: joint material f: foundation column g: small beam v: brace

Claims (4)

A slide construction method for rigid-frame structures,
1) A step in which a gantry for assembling the partial frames of the Rahmen structure is installed at a specific assembly position so as to be movable on slide rails.
2) The partial frame assembled on the gantry installed at the assembling position shall be mounted on the slide rails with the girders supported by the gantry and the column bases of the partial frame floating in the air. is transported to a predetermined position.
3) A process in which the partial frame that has been transported to the predetermined position is jacked down to release support from the gantry, and the column bases are fixed on predetermined foundation columns to stand on their own.
4) When the column base of the partial frame of the Rahmen structure is jacked down, before the column base is placed on a predetermined foundation column, the deviation from the correct installation position of the column base is caused by the column base. A step of correcting by applying a horizontal force to the column base portion in the outward direction by a position adjusting means connected between the column and the gantry .
A slide construction method for a rigid-frame structure, comprising the steps described above. A slide construction method for rigid-frame structures,
1) A step in which a gantry for assembling the partial frames of the Rahmen structure is installed at a specific assembly position so as to be movable on slide rails.
2) The partial frame assembled on the gantry installed at the assembling position shall be mounted on the slide rails with the girders supported by the gantry and the column bases of the partial frame floating in the air. is transported to a predetermined position.
3) Before jacking down the partial frame that has been transported to the predetermined position, a new gantry for assembling the next partial frame is installed at the specific assembly position, and the next partial frame is assembled. .
4) The next partial frame is transported to a predetermined position on the slide rails with its column base suspended in the air like the previous partial frame, and is connected to the previously transported partial frame. The process of being integrated.
5) A step in which steps 3) to 4) are performed at least once.
6) A step of jacking down all of the connected and integrated partial frames that have already been transported so that the support by the gantry is released, and all of the column bases are fixed on predetermined foundation columns to stand on their own.
7) When the column base of the partial frame of the Rahmen structure is jacked down, before the column base is placed on a predetermined foundation column, the deviation from the correct installation position of the column base is caused by the column base. A step of correcting by applying a horizontal force to the column base portion in the outward direction by a position adjusting means connected between the column and the gantry .
A slide construction method for a rigid-frame structure, comprising the steps described above. In the slide construction method for rigid-frame structures according to claim 1 or 2,
A rigid frame characterized in that a reinforcing member is installed to connect a part of each gantry standing in a row in the span direction of the partial frame of the rigid-frame structure facing each other and the large beam portion of the partial frame. Sliding construction method for structures. In the slide construction method for rigid-frame structures according to claim 1 or 2,
A slide construction method for a Rahmen structure, wherein the respective gantry stands facing each other side by side in the span direction of the partial frames of the Rahmen structure are directly connected to each other by the structural body.

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