Formwork suspending and erecting method for special-shaped ring beam under limited space condition

Abstract

The method includes the steps that firstly, a bottom steel pipe is placed on the top of a distribution beam, one end of the bottom steel pipe abuts against a bin wall, the other end of the bottom steel pipe clamps the distribution beam through a fastener, and a ring beam bottom opening formwork and a wood brace are fixed and aligned; 2, two rows of vertical rods located at the bottom of the ring beam and adjustable jacking supports located at the tops of the vertical rods are fixed to the bottom steel pipe, the angle and the elevation are aligned, the two rows of adjustable jacking supports are in one-to-one correspondence, and the two corresponding adjustable jacking supports form an inclined angle; thirdly, the combined type main beams are installed on the two corresponding adjustable jacking parts, and the combined type main beams and the adjustable jacking parts are bound; fourthly, the conversion main beams are fixed to the inclined faces of the combined main beams at intervals; 5, secondary beam wood braces are fixed to the inclined faces of the conversion main beams, and an inclined face bottom die is aligned and laid; sixthly, cone top vertical rods in the cone top bent frame are fixedly connected with the row of vertical rods away from the silo wall, and the bottoms of the cone top vertical rods are arranged on the top of the annular steel channel; seventhly, a ring beam side formwork is erected; 8, conic node structural steel bar binding and electromechanical pre-embedding construction are conducted; and ninthly, layered pouring of the ring beams is conducted.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building construction, in particular to a formwork supporting method suitable for a special-shaped ring beam with limited space of a silo conical inclined plate. BACKGROUND

[0002] The formwork supporting method of the existing special-shaped ring beam generally adopts a steel pipe formwork supporting with eccentric force. A double fastener is arranged at the top, and a vertical rod is arranged on a steel truss ring distribution beam. This method has the following problems: ① the minimum length of the steel pipe is 1 m, and the vertical rod needs to be cut according to the slope, which causes a large one-time loss of the steel pipe, clamps and frame wood turnover materials, and wastes costs; ② the transmission mode of the eccentric force is more difficult to guarantee under the condition of limited space; ③ the construction operability is inconvenient, the construction speed is slow, the efficiency is low, and the construction is time-consuming and laborious; ④ if the operation space under the special-shaped ring beam is too large, the amount of materials and labor costs of the overall silo conical top plate will be increased; ⑤ the slope wood frame sub-keel and the steel pipe main keel are easy to slip off, and it is difficult to restore them to the original position once they are loosened, which causes a quality risk. SUMMARY

[0003] In view of the problems and deficiencies of the prior art, the present application provides a formwork supporting method under the condition of limited space of a special-shaped ring beam, which solves the technical problems of: ① improving the operability of the eccentric force mode; ② improving the formwork supporting structure of the pure eccentric force; ③ improving the turnover use of materials; ④ avoiding the large amount of materials of the overall silo conical top plate due to the large operation space under the special-shaped ring beam, thereby reducing costs; ⑤ ensuring the firm fixation of the main keel and the sub-keel.

[0004] The present application solves the above technical problems by the following technical scheme:

[0005] The present application provides a formwork supporting method under the condition of limited space of a special-shaped ring beam, which is characterized by the following steps:

[0006] Step 1: placing a bottom steel pipe on the top of the ring-shaped channel steel distribution beam, one end of the bottom steel pipe being tightly pressed against the wall, and the other end being clamped to the ring-shaped channel steel distribution beam through a fastener, the bottom steel pipe providing a suspension support for the vertical rod of the frame, and the ring beam bottom formwork and the wood frame being fixed and aligned by an infrared leveling instrument;

[0007] Step 2: fixing and installing two rows of vertical rods at the bottom of the ring beam on the bottom steel pipe, and installing adjustable jacks with stiffeners on the top of the two rows of vertical rods, wherein the top end of the adjustable jack on the top of the vertical rod close to the wall is lower than the top end of the adjustable jack on the top of the other row of vertical rods away from the wall, the angle and elevation of the two rows of adjustable jacks are aligned by an infrared leveling instrument, the two adjustable jacks correspond to each other, and the corresponding two adjustable jacks have an inclination angle matching the bottom of the ring beam;

[0008] Step three: install a combination of main beam composed of a steel pipe and a wooden board on the corresponding two adjustable jacks, and bind the combination of main beam and the adjustable jacks with iron wire firmly;

[0009] Step four: the inclined surface of the combination of main beam is fixedly installed with a conversion main beam at intervals;

[0010] Step five: the inclined surface of the conversion main beam is fixedly installed with a secondary beam wooden board, and final alignment is performed through an infrared leveling instrument; after alignment, the excess wooden board is sawed off, and an inclined surface bottom die is laid on the inclined surface of the secondary beam wooden board;

[0011] Step six: longitudinal and transverse sweeping rods are installed on the row of vertical rods far away from the warehouse wall, ring beam reinforcement is bound on the surface of the inclined surface bottom die and the top of the warehouse wall and located in the area of the special-shaped ring beam, a conical top bent frame is supported, the conical top vertical rod in the conical top bent frame is fixedly connected with the row of vertical rods far away from the warehouse wall, and the bottom of the conical top vertical rod is arranged on the top of the ring-shaped channel steel;

[0012] Step seven: a ring beam side die is supported, and is fastened through a double nut tensioning screw;

[0013] Step eight: conical top structure reinforcement binding and electromechanical pre-burying construction;

[0014] Step nine: before pouring concrete, the ring beam and the conical top bent frame are inspected, accepted and rectified, the ring beam is poured in layers, and the process is observed.

[0015] The positive progress effect of the application lies in:

[0016] The application promotes an improved eccentric force suspension formwork structure, the force system is scientific, the problems of difficult construction and sinking of the top rotary fastener are overcome, the lower horizontal rod (bottom steel pipe) and the vertical rod are directly connected, fastening is facilitated, the U-shaped jack and the main keel composed of the steel pipe and the wooden board are used, the bending resistance of the steel pipe can be effectively utilized, the tight connection of the longitudinal and transverse wooden boards can be ensured, the steel pipe does not need to be cut, the wooden board is not easy to deform, the double-steel-surrounding-purlin can fully utilize the tensile and deformation capacity, the materials can be repeatedly used, and the construction efficiency can be greatly improved; one tensioning screw is additionally arranged in the gap between the vertical rods of the inclined surface, and the force system is strengthened. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a bottom steel pipe and ring beam bottom die plane schematic view;

[0018] Figure 2 It is a bottom steel pipe and ring beam bottom die cross-sectional schematic view;

[0019] Figure 3 It is a vertical rod and adjustable jack installation plane schematic view;

[0020] Figure 4Figure 4 is a schematic view of a cross-section of a pole and adjustable support installation profile;

[0021] Figure 5 Figure 5 is a schematic view of a combined main beam and support installation plane;

[0022] Figure 6 Figure 6 is a schematic view of a combined main beam and support connection cross-section;

[0023] Figure 7 Figure 7 is a schematic view of a conversion main beam installation plane;

[0024] Figure 8 Figure 8 is a schematic view of a conversion main beam installation cross-section;

[0025] Figure 9 Figure 9 is a schematic view of a secondary beam wooden form and inclined plane formwork installation plane;

[0026] Figure 10 Figure 10 is a schematic view of a secondary beam wooden form and inclined plane formwork installation plane;

[0027] Figure 11 Figure 11 is a schematic view of a tapered bent support and reinforcement binding cross-section;

[0028] Figure 12 Figure 12 is a schematic view of a ring beam side formwork support cross-section;

[0029] Figure 13 Figure 13 is a schematic view of a tapered structure construction cross-section;

[0030] Figure 14 Figure 14 is a schematic view of a special-shaped ring beam layer-by-layer pouring cross-section;

[0031] Figure 15 Figure 15 is a schematic view of a cross-section environmental information diagram;

[0032] Figure 16 Figure 16 is an enlarged view of a support node. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0034] As shown in Figures 1-16 the present embodiment provides a suspension formwork method under the condition of special-shaped ring beam space limitation, which is a non-conventional formwork method for improving eccentric stress, and includes the following steps:

[0035] Step one: Place the bottom steel pipe on the top of the ring-shaped channel distribution beam, one end of the bottom steel pipe tightly against the wall of the silo (left end in Figure 2 ), the other end (right end in Figure 2 ) is clamped to the ring-shaped channel distribution beam by a fastener, the bottom steel pipe provides suspension bent frame stand fastening, the ring beam bottom formwork and wooden form are fixed and aligned by an infrared leveling instrument (see Figure 1 , Figure 2 for details).

[0036] In this step, the bottom steel pipe (as a radial horizontal sweeping rod) is lowered to the ring-shaped channel distribution beam in a suspended foot mode, one end tightly against the wall of the silo, and the other end clamped to the ring-shaped channel distribution beam by adding a fastener to limit the displacement of the bottom steel pipe.

[0037] Step two: Fix and install two rows of vertical rods on the ring beam bottom on the bottom steel pipe, and install adjustable jacks with stiffeners on the top of the two rows of vertical rods, where the top end of the adjustable jack on the top of the vertical rod close to the wall of the silo is lower than the top end of the adjustable jack on the top of the other vertical rod away from the wall of the silo, and the angle and elevation are aligned by an infrared leveling instrument, the two adjustable jacks correspond to each other, and the corresponding two adjustable jacks are at an inclined angle matching the ring beam bottom (see Figure 3 , Figure 4 for details).

[0038] In this step, the two rows of vertical rods can be connected to the bottom steel pipe through the bottom fastener in a suspended foot mode, ensuring that workers can tighten the fastener conveniently.

[0039] In this step, the adjustable jacks use U-shaped seats, and the U-shaped seats are arranged on the top of the two rows of vertical rods.

[0040] Step three: Install a combined main beam composed of a steel pipe and a wooden form on the corresponding two adjustable jacks, and bind the combined main beam and the adjustable jacks firmly with iron wire (see Figure 5 , Figure 6 for details).

[0041] In this step, a main keel (combined main beam) composed of a steel pipe and a wooden form is arranged in the U-shaped seat (the combined main beam can fully utilize the bending resistance of the steel pipe, and can also be conveniently tightened against the wooden form), and the steel pipe and wooden form are tightened with the adjustable jacks using iron wire.

[0042] In this step, to increase the contact area of the U-shaped seat and the combined main beam (main keel composed of a steel pipe and a wooden form), wooden wedges are used to wedge the inclined surface, further ensuring reliable stress (see Figure 16 for details).

[0043] Step four: The inclined surface of the combined main beam is fixedly installed with a conversion main beam at intervals (see Figure 7 , Figure 8 for details).​​​​​​​​​​​

[0044] Step five: the fixed installation of the secondary beam wooden form on the slope of the main beam, the final alignment is carried out through the infrared leveling instrument, after alignment, the excess wooden form is sawn off, and the slope bottom die is laid on the slope of the secondary beam wooden form (see the attached Figure 9 , the attached Figure 10 ).

[0045] Step six: the longitudinal and transverse sweeping rod is installed on the row of vertical rods far away from the warehouse wall, the ring beam reinforcement is bound on the surface of the slope bottom die and the top of the warehouse wall and located in the special-shaped ring beam area, the conical top bent frame is supported, the conical top vertical rod in the conical top bent frame is fixedly connected with the row of vertical rods far away from the warehouse wall, and the bottom of the conical top vertical rod is arranged on the top of the ring-shaped channel steel (see the attached Figure 11 ).

[0046] In this step, during the erection of the conical top bent frame, the conical top vertical rod of the conical top bent frame is fixedly connected with the row of vertical rods far away from the warehouse wall in time, and the bottom of the conical top vertical rod is arranged on the top of the ring-shaped channel steel, so that the cantilever height of the vertical rod is reduced, and the overall stability of the suspended frame body is enhanced.

[0047] Step seven: the ring beam side die is supported, and is fastened through the double nuts of the tensioning screw rod (see the attached Figure 12 ).

[0048] In this step, one tensioning screw rod is additionally arranged on each span from bottom to top on the opposite sides of the ring beam, and one end of the tensioning screw rod is tightly pulled to the ring-shaped wooden form back rabbet, and the other end is tightly pulled to the ring-shaped steel reinforcement surrounding purlin on the side of the ring beam.

[0049] Step eight: the conical top structure steel reinforcement is bound and the electromechanical pre-burying construction is carried out (see the attached Figure 13 ).

[0050] Step nine: the pre-ring beam and the conical top bent frame are inspected, accepted and rectified before pouring concrete, the ring beam is poured in layers, and the process is observed (see the attached Figure 14 ).

[0051] The application is developed and applied in the first phase project of Qingpu grain storage project of the present application, the project has 25 shallow circular silos, the single warehouse has an inner diameter of 25m, and the conical top height is 29.900m-34.200m. The pre-ring beam and the conical top structure of the project use the high-altitude support steel platform to erect the bent frame.

[0052] We developed and applied the invention of suspension formwork structure, stress system science, overcome the top rotating fastener difficult to construction and sinking problem, at the same time, the main keel of U type top support and through the combination of steel pipe and wood frame can effectively utilize the bending capacity of steel pipe, and ensure the longitudinal and lateral wood frame nail tight connection, steel pipe does not need to cut, wood frame is not easy to deform, double reinforced surround purlin can fully utilize the tensile and deformation capacity, the material can be reused, can greatly improve the construction efficiency, reduce the construction cost; through the gap between each row of inclined surface vertical rod, a pair of tensioning screw rod is additionally arranged for reinforcement, which enhances the stress system. Good economic and technical effect is obtained.

[0053] Although the specific embodiments of the present application are described above, those skilled in the art should understand that these are only illustrative, the protection scope of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present application, and these changes and modifications all fall within the protection scope of the present application.

Claims

1. A method for suspended formwork under space-constrained conditions for special-shaped ring beams, characterized in that: It includes the following steps: Step 1: Place the bottom steel pipe on top of the annular channel steel distribution beam. One end of the bottom steel pipe is pressed against the warehouse wall, and the other end is clamped to the annular channel steel distribution beam through fasteners. The bottom steel pipe is used for fastening to the suspension rack uprights. The bottom template of the ring beam and the wooden beam are fixed and aligned using an infrared leveler. Step 2: Fix two rows of vertical poles at the bottom of the ring beam on the bottom steel pipe and install adjustable top supports with stiffening plates on the top of the two rows of vertical poles. The top of the adjustable top support on the top of the row of vertical poles close to the warehouse wall is lower than the top of the adjustable top support on the top of the other row of vertical poles away from the warehouse wall. Use an infrared leveler to align the angle and elevation. The two rows of adjustable top supports correspond one to one, and the corresponding two adjustable top supports have an inclination angle that matches the bottom of the ring beam. Step 3: Install a composite main beam consisting of a steel pipe and a wooden beam on the corresponding two adjustable top supports, and use wire to firmly tie the composite main beam and the adjustable top supports; Step 4: Conversion main beams are fixedly installed at intervals on the inclined surface of the combined main beam; Step 5: Install the secondary beams on the inclined surface of the converted main beams, use an infrared leveler to perform final alignment, saw off any excess beams, and lay the inclined bottom formwork on the inclined surface of the secondary beams; Step 6: Install vertical and horizontal sweeping rods on the row of vertical poles away from the warehouse wall, tie the ring beam reinforcement on the surface of the inclined bottom formwork and the top of the warehouse wall in the area of ​​the special-shaped ring beam, and support the cone top frame. Fix the cone top vertical poles in the cone top frame with the row of vertical poles away from the warehouse wall, and place the bottom of the cone top vertical poles on the top of the annular channel steel; Step 7: Support the side formwork of the ring beam and tighten it with double nuts on the tension screws; Step 8: Construction of steel bars binding and electromechanical pre-embedded parts of the cone top structure; Step 9: Inspect, accept and rectify the ring beam and cone top frame before pouring concrete. Pour the ring beam in layers and strengthen the mold inspection process.

2. The method for suspended formwork under space-constrained conditions for special-shaped ring beams according to claim 1, characterized in that: In step 2, the adjustable top support adopts a U-shaped bracket.

3. The method for suspended formwork under space-constrained conditions for special-shaped ring beams according to claim 2, characterized in that: In step three, the contact surface between the U-shaped bracket and the combined main beam is wedged with a wooden wedge to tighten the inclined surface.

4. The method for suspended formwork under space-constrained conditions for special-shaped ring beams according to claim 1, characterized in that: In step seven, a tension screw is added to each span from bottom to top on the opposite side of the ring beam for reinforcement. One end of the tension screw tightens the circumferential wooden beam back rib, and the other end tightens the circumferential steel purlin on the side of the ring beam.

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