A large-scale assembly factory building local super-high cast beam formwork and a construction method thereof

Abstract

This invention discloses a formwork and construction method for a partially ultra-high cast-in-place beam in a large prefabricated factory building, relating to the field of building construction technology. It includes angle irons installed on both sides of a precast beam. Bolt holes are provided on one side surface of the angle irons, and fixing holes are provided on the other side surface. Square steel is installed above the angle irons, and a bottom beam formwork is installed above the square steel. Stirrups are installed above the bottom beam formwork, and the stirrups are filled with cast-in-place reinforcing steel. Side forms are provided on the surfaces of the stirrups, and square timber is installed on the side of the side forms away from the stirrups. The method employs a formwork support system where angle irons are mechanically anchored to the sides of the already installed high-altitude precast beam as load-bearing supports, and square steel is placed on the angle irons as a load-bearing frame. The anchor holes at the fixing points between the angle irons and the precast beams are L-shaped, allowing for variable elevation of the angle irons, ensuring both safe formwork support and smooth demolding.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a formwork for a partially ultra-high cast-in-place beam in a large prefabricated factory and its construction method. Background Technology

[0002] Large factory buildings are characterized by their large area, long span, and high floor height. Currently, many large factory buildings adopt standard span designs and prefabricated construction for their beam and slab structures. However, some areas still require cast-in-place structures due to functional requirements (such as the location of restrooms). Because restrooms have relatively small beam cross-sections and spans, and are diverse in type, prefabricated components cannot be mass-produced. Therefore, their beams are designed as cast-in-place structures, and the slabs are constructed using steel-plated plates.

[0003] For the construction of the aforementioned cast-in-place beams, formwork support must be considered. Given the relatively high floor height of large factory buildings (10 meters or more), traditional methods require the erection of tall formwork scaffolds. However, erecting tall formwork scaffolds under local cast-in-place beams presents several disadvantages: ① The height-to-width ratio of tall formwork scaffolds with large height and small width is difficult to meet requirements, posing a safety hazard due to insufficient overall stability of the scaffold; ② Tall formwork scaffolds must be erected using disc-lock scaffolding, resulting in high material and construction costs, long construction time, and complex processes; ③ The scaffold itself and the construction load are large, requiring reinforcement and treatment of the scaffold uprights foundation, etc.

[0004] Based on the disadvantages of traditional formwork support, this paper studies and improves the existing structure and its deficiencies, and proposes a formwork for local ultra-high poured beams in large prefabricated factory buildings and its construction method. Summary of the Invention

[0005] The purpose of this invention is to provide a formwork template for a partially ultra-high cast-in-place beam in a large prefabricated factory building and its construction method, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a formwork for a partially ultra-high cast-in-place beam in a large prefabricated factory building, comprising angle irons installed on both sides of a precast beam, bolt holes being provided on one side surface of the angle irons, and bolts for fixing the angle irons being provided inside the bolt holes; fixing holes being provided on the other side surface of the angle irons, and fixing devices being installed inside the fixing holes; square steel being installed above the angle irons, and a bottom beam formwork being installed above the square steel; stirrups being installed above the bottom beam formwork, and the stirrups being filled with cast-in-place reinforcing steel bars; side molds being provided on the surface of the stirrups, and square timber being installed on the side of the side molds away from the stirrups.

[0007] Furthermore, the bolt holes are L-shaped square holes, and the angle iron is fixed to the precast beam through the bolt holes and bolts.

[0008] Furthermore, multiple square steel bars are provided, and the square steel bars are arranged at equal intervals on the surface of the angle iron, while the distance between two adjacent square steel bars is no more than 10cm.

[0009] Furthermore, the square steel has dimensions of 80cm*60cm*5cm, and its length does not exceed 3.0 meters.

[0010] Furthermore, the fixing device is used to fix the square steel to the angle iron, and the fixing device is a screw or a detachable pin. The square steel and the bottom beam template are fixed by binding with steel wire.

[0011] Furthermore, the stirrups are arranged at equal intervals along the direction of the cast-in-place reinforcing bars, and the stirrups are tied to the cast-in-place reinforcing bars with steel wire.

[0012] Furthermore, concrete is poured in the area enclosed by the bottom beam formwork and side formwork, and the stirrups and cast-in-place steel bars are all encased in concrete.

[0013] Furthermore, the side molds are L-shaped, with two side molds forming a group, and each group of side molds is symmetrically distributed about the vertical centerline of the concrete.

[0014] Furthermore, a construction method for formwork of partially ultra-high cast-in-place beams in a large prefabricated factory building includes the following steps:

[0015] Step 1: First, use a cast-in-place rebar detector to determine the location of the precast beam rebar, determine the installation location of the mechanical anchor bolts and mark it. Then, drill a hole on one side of the precast beam. The drilling depth of the precast beam is longer than the length of the mechanical anchor bolt, and the diameter of the drilling hole in the precast beam is larger than the diameter of the mechanical anchor bolt. After drilling, clean the dust and debris in the hole.

[0016] Step 2: The cast-in-place reinforcing bars are connected to the precast beam reinforcing bars using chemical anchoring.

[0017] Step 3: Insert the mechanical anchor into the pre-drilled hole on the side of the precast beam and tighten it with a wrench. While tightening the mechanical anchor, the mechanical anchor passes through the "L"-shaped square hole of the bolt hole on the angle iron to fix the angle iron to the side of the precast beam to form a support, and fix the anchor at the end of the horizontal hole at the bottom of the bolt hole.

[0018] Step 4: Place the square steel on the angle iron support, place the bottom beam formwork on the square steel, and tie the bottom beam formwork to the square steel with wire. Before installation, clean the surface of the bottom beam formwork and side formwork, apply release agent, use a level to measure the elevation of the bottom beam formwork and side formwork for correction, and seal the joints tightly with adhesive strips.

[0019] Step 5: Then lay the side formwork. Use square timber to fix the side formwork on both sides. After the side formwork is laid, clean up the wood chips and debris on the board surface. Tie the stirrups and cast-in-place steel bars together and place them in the area enclosed by the bottom beam formwork and the side formwork.

[0020] Step Six: Pour concrete. When the concrete strength reaches % of the design value, remove the formwork. First, loosen the nuts of the mechanical bolts, then gently tap the angle iron with a small hammer to position the bolts at the vertical holes of the angle iron. After the elevation of the angle iron support drops, it will detach from the bottom beam formwork. Then, remove the square steel and side formwork.

[0021] Step 7: Grind the mechanical anchor bolts left on the side of the precast beam along the bottom of the cast-in-place concrete slab with a grinding wheel, and then apply a steel reinforcement rust inhibitor.

[0022] This invention provides a formwork template and construction method for a partially ultra-high cast-in-place beam in a large prefabricated factory building, which has the following advantages: It adopts a formwork support method in which angle iron is fixed to the side of the already installed high-altitude precast beam by mechanical anchor bolts as a load-bearing support, and then square steel is placed on the angle iron as a load-bearing frame. The anchor bolt holes at the fixing points of the angle iron and the precast beam adopt an L-shaped design, which makes the elevation of the angle iron variable, ensuring both the safety of the formwork support and the smooth demolding.

[0023] As a support system that does not require the erection of formwork, it can greatly accelerate the construction progress and thus shorten the construction period. Compared with the traditional ground-supported formwork system, the construction time according to the procedures in this application can be greatly shortened.

[0024] Taking a floor height of 10 meters as an example, there is no need to erect a tall formwork, which significantly saves construction costs. Compared with the traditional ground-supported high formwork, the formwork system of this application can greatly save the turnover materials of the support frame, and at the same time save a lot of manpower. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall three-dimensional internal structure of a formwork template for a partially ultra-high poured beam in a large prefabricated factory building according to the present invention.

[0026] Figure 2 This is a schematic diagram of the overall structure after casting of a partially ultra-high pouring beam formwork for a large prefabricated factory building according to the present invention.

[0027] Figure 3 This is a schematic diagram of the angle iron structure of a partially ultra-high cast-in-place beam formwork for a large prefabricated factory building according to the present invention;

[0028] Figure 4 This is a schematic diagram of the side view of the formwork for a partially ultra-high cast beam in a large prefabricated factory building after casting, according to the present invention.

[0029] Figure 5This is a schematic diagram of the square steel installation structure of a partially ultra-high cast-in-place beam formwork for a large prefabricated factory building according to the present invention.

[0030] Figure 6 This is a schematic diagram of the installation structure of square steel and bottom beam formwork for a partially ultra-high pouring beam formwork in a large prefabricated factory building according to the present invention.

[0031] In the diagram: 1. Angle iron; 2. Bolt hole; 3. Bolt; 4. Fixing hole; 5. Square steel; 6. Fixing device; 7. Bottom beam formwork; 8. Stirrup; 9. Cast-in-place steel reinforcement; 10. Side formwork; 11. Square timber; 12. Concrete. Detailed Implementation

[0032] Please see Figures 1 to 6 The present invention provides a technical solution: a formwork for a partially ultra-high cast-in-place beam in a large prefabricated factory building, comprising angle irons 1 installed on both sides of a precast beam, bolt holes 2 provided on one side surface of the angle irons 1, and bolts 3 for fixing the angle irons 1 provided inside the bolt holes 2, fixing holes 4 provided on the other side surface of the angle irons 1, and fixing devices 6 installed inside the fixing holes 4, square steel 5 installed above the angle irons 1, and a bottom beam formwork 7 installed above the square steel 5, stirrups 8 installed above the bottom beam formwork 7, and the stirrups 8 filled with cast-in-place steel bars 9, and side molds 10 provided on the surface of each stirrup 8, and square timber 11 installed on the side of the side mold 10 away from the stirrups 8.

[0033] Bolt hole 2 is an "L" shaped square hole, and angle iron 1 is fixed to the precast beam through bolt hole 2 and bolt 3.

[0034] Multiple square steel bars 5 are provided, and the square steel bars 5 are arranged at equal intervals on the surface of the angle iron 1, while the spacing between two adjacent square steel bars 5 is no more than 10cm.

[0035] The dimensions of square steel 5 are 80cm*60cm*5cm, and the length of square steel 5 shall not exceed 3.0 meters.

[0036] The fixing device 6 is used to fix the square steel 5 to the angle iron 1, and the fixing device 6 is a screw or a detachable pin. The square steel 5 is fixed to the bottom beam template 7 by steel wire binding.

[0037] The stirrups 8 are arranged at equal intervals along the direction of the cast-in-place steel bars 9, and the stirrups 8 are tied to the cast-in-place steel bars 9 with steel wire.

[0038] Concrete 12 is poured in the area enclosed by the bottom beam formwork 7 and the side formwork 10, and the stirrups 8 and the cast-in-place steel bars 9 are all enclosed in the concrete 12.

[0039] The side formwork 10 is L-shaped, and every two side formwork 10s form a group. At the same time, the side formwork 10s in each group are symmetrically distributed about the vertical center line of the concrete 12.

[0040] A construction method for formwork of partially ultra-high cast-in-place beams in a large prefabricated factory building, the method comprising the following steps:

[0041] Step 1: First, use a cast-in-place rebar detector to determine the location of the precast beam rebar, determine the installation location of the mechanical anchor bolts and mark it. Then, drill a hole on one side of the precast beam. The drilling depth of the precast beam is longer than the length of the mechanical anchor bolt, and the diameter of the drilling hole in the precast beam is larger than the diameter of the mechanical anchor bolt. After drilling, clean the dust and debris in the hole.

[0042] Step 2: The cast-in-place reinforcing steel 9 is connected to the precast beam reinforcing steel using chemical anchoring;

[0043] Step 3: Insert the mechanical anchor into the pre-drilled hole on the side of the precast beam and tighten it with a wrench. While tightening the mechanical anchor, the mechanical anchor passes through the "L"-shaped square hole of the bolt hole 2 on the angle iron 1 to fix the angle iron 1 to the side of the precast beam to form a support, and fix the anchor at the end of the horizontal hole at the bottom of the bolt hole 2.

[0044] Step 4: Place the square steel 5 on the angle iron 1 support, place the bottom beam template 7 on the square steel 5, and tie the bottom beam template 7 to the square steel 5 with wire. Before installation, clean the bottom beam template 7 and the side template 10, apply release agent, use a level to measure the elevation of the bottom beam template 7 and the side template 10 for correction, and seal the joints tightly with adhesive strips.

[0045] Step 5: Then lay the side formwork 10. Use square timber 11 to fix the side formwork 10 on both sides. After the side formwork 10 is laid, clean up the sawdust and debris on the board surface. Tie the stirrups 8 and the cast-in-place steel bars 9 together and place them in the area enclosed by the bottom beam formwork 7 and the side formwork 10.

[0046] Step 6: Pour concrete 12. When the concrete 12 strength grade reaches 75% of the design value, remove the formwork. First, loosen the nuts of the mechanical bolts, then gently tap the angle iron 1 with a small hammer so that the bolt 3 is located at the vertical hole of the angle iron 1. After the elevation of the support of the angle iron 1 drops, it will be separated from the bottom beam formwork 7. Then remove the square steel 5 and the side formwork 10.

[0047] Step 7: Grind the mechanical anchor bolts left on the side of the precast beam along the bottom of the 12 cast-in-place concrete slab with a grinding wheel, and then apply a steel reinforcement rust inhibitor.

[0048] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A formwork for partially extra-high cast-in-place beams in a large prefabricated factory building, characterized in that, The system includes angle irons (1) installed on both sides of a precast beam. One side surface of each angle iron (1) has bolt holes (2), and bolts (3) for fixing the angle iron (1) are installed inside the bolt holes (2). The bolt holes (2) are L-shaped square holes, and the angle iron (1) is fixed to the precast beam via the bolt holes (2) and bolts (3). The other side surface of each angle iron (1) has fixing holes (4), and fixing devices (6) are installed inside the fixing holes (4). A mounting bracket is installed above the angle iron (1). Square steel (5), and a bottom beam template (7) is installed on top of the square steel (5). Stirrups (8) are installed on top of the bottom beam template (7), and the inside of the stirrups (8) is filled with cast-in-place steel bars (9). Side molds (10) are provided on the surface of the stirrups (8), and square timber (11) is installed on the side of the side mold (10) away from the stirrups (8). Angle iron is fixed to the side of the precast beam as a load-bearing support by mechanical anchor bolts, and the anchor bolt holes of the angle iron and the precast beam fixing point adopt an L-shaped design, so that the elevation of the angle iron can be changed and demolding is convenient.

2. The formwork for partially extra-high cast-in-place beams in a large prefabricated factory building according to claim 1, characterized in that, Multiple square steel bars (5) are provided, and the square steel bars (5) are arranged at equal intervals on the surface of the angle iron (1), while the spacing between two adjacent square steel bars (5) is no more than 10cm.

3. The formwork for partially extra-high cast-in-place beams in a large prefabricated factory building according to claim 1, characterized in that, The square steel (5) has a specification of 80cm*60cm*5cm and a length not exceeding 3.0 meters.

4. The formwork for partially extra-high cast-in-place beams in a large prefabricated factory building according to claim 1, characterized in that, The fixing device (6) is used to fix the square steel (5) on the angle iron (1), and the fixing device (6) is a screw or a detachable pin. The square steel (5) and the bottom beam template (7) are fixed by steel wire binding.

5. The formwork for partially extra-high cast-in-place beams in a large prefabricated factory building according to claim 1, characterized in that, The stirrups (8) are arranged at equal intervals along the direction of the cast-in-place steel bars (9), and the stirrups (8) are tied to the cast-in-place steel bars (9) with steel wire.

6. The formwork for partially extra-high cast-in-place beams in a large prefabricated factory building according to claim 1, characterized in that, The area enclosed by the bottom beam formwork (7) and the side formwork (10) is filled with concrete (12), and the stirrups (8) and the cast-in-place steel bars (9) are all enclosed in the concrete (12).

7. A formwork for partially extra-high cast-in-place beams in a large prefabricated factory building according to claim 6, characterized in that, The side molds (10) are "L" shaped, and each pair of side molds (10) forms a group. At the same time, each group of side molds (10) is symmetrically distributed about the vertical center line of the concrete (12).

8. A construction method for a partially ultra-high cast-in-place beam formwork in a large prefabricated factory building, employing the partially ultra-high cast-in-place beam formwork described in any one of claims 1-7, characterized in that... The construction method includes the following steps: Step 1: First, use a cast-in-place rebar detector to determine the location of the precast beam rebar, determine the installation location of the mechanical anchor bolts and mark it. Then, drill a hole on one side of the precast beam. The drilling depth of the precast beam is longer than the length of the mechanical anchor bolt, and the diameter of the drilling hole in the precast beam is larger than the diameter of the mechanical anchor bolt. After drilling, clean the dust and debris in the hole. Step 2: The cast-in-place reinforcing bars (9) are connected to the precast beam reinforcing bars through chemical anchoring; Step 3: Insert the mechanical anchor into the pre-drilled hole on the side of the precast beam and tighten it with a wrench. When tightening the mechanical anchor, the mechanical anchor passes through the "L"-shaped square hole of the bolt hole (2) on the angle iron (1) to fix the angle iron (1) to the side of the precast beam to form a support, and fix the anchor at the end of the horizontal hole at the bottom of the bolt hole (2). Step 4: Place the square steel (5) on the angle iron (1) support, place the bottom beam template (7) on the square steel (5), and tie the bottom beam template (7) to the square steel (5) with wire. Before installation, clean the bottom beam template (7) and the side template (10), apply release agent, measure the elevation of the bottom beam template (7) and the side template (10) with a level and correct it. Seal the joints tightly with adhesive strips. Step 5: Then lay the side formwork (10). Use square timber (11) to fix the side formwork (10) on both sides. After the side formwork (10) is laid, clean up the wood chips and debris on the board surface. Tie the stirrups (8) and the cast-in-place steel bars (9) together and place them in the area enclosed by the bottom beam formwork (7) and the side formwork (10). Step 6: Pour concrete (12). When the concrete (12) strength grade reaches 75% of the design value, demolding is carried out. First, loosen the nuts of the mechanical bolts, and then gently tap the angle iron (1) with a small hammer so that the bolt (3) is located at the vertical hole of the angle iron (1). After the elevation of the angle iron (1) support drops, it separates from the bottom beam formwork (7). Then, disassemble the square steel (5) and the side formwork (10). Step 7: Grind the mechanical anchor bolts left on the side of the precast beam along the bottom of the concrete (12) slab with a grinding wheel, and then apply the steel reinforcement rust inhibitor.

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