Formwork mounting and dismounting construction method in limited space of post-cast structure

Abstract

The invention discloses a post-pouring structure limited space inner formwork mounting and dismounting construction method. The method comprises the steps that firstly, an inner formwork and an outer formwork of a post-pouring structure are machined in advance; 2, simply fixing an inner template in the limited space, and tightly attaching the inner template to the reinforcing steel bar protective layer cushion block; thirdly, the outer formwork is tightly attached to the two ends of the inner formwork to be fixed, and the outer formwork is tightly attached to the reinforcing steel bar protection layer cushion blocks; fourthly, a reinforcing device is installed, so that the inner formwork and the outer formwork of the post-pouring structure and an existing concrete structure form embracing column embracing reinforcing; fifthly, sand is poured into a limited space formed by the inner formwork of the post-pouring structure, the existing concrete structure and the outer formwork, and the sand is poured and tamped; sixthly, post-pouring structural concrete is poured, and full vibration and maintenance are conducted; and seventhly, the reinforcing device and the post-pouring structure outer formwork are dismantled, the sand body in the limited space is naturally dismantled, and the inner formwork can be easily dismantled. The formwork in the limited space is convenient to mount and dismount, the loss of the formwork is small, and the turnover efficiency of materials is improved.

Description

Technical Field

[0001] The invention relates to the field of house construction, in particular to a construction method for installing and disassembling formwork in a limited space of a post-cast structure. Background Art

[0002] In order to reduce the impact of temperature changes, uneven settlement and earthquakes on the safety performance of building structures, structural protection measures such as expansion joints, settlement joints and seismic joints are usually set in longer structural members. At present, since the structure usually adopts reinforced concrete cast-in-place structure, and the width of the joints between structures is usually small, it is very difficult to reinforce the formwork in the limited space at the structural joint. If the reinforcement is not dense, concrete leakage and formwork extrusion will occur, causing structural quality problems.

[0003] The pouring process is affected by the gravity of concrete, and the unreinforced formwork in the limited space is subjected to uneven squeezing, which makes it easy for the formwork to form misaligned joints, stuck joints, and formwork embedding with the concrete surface, making it impossible to remove the formwork normally. Forcibly prying and chiseling off the formwork at the construction site will not only damage the formwork, but also destroy the protective layer on the concrete surface, affecting the quality of the concrete structure in the limited space.

[0004] Common installation and removal of templates in limited spaces can be divided into the following two categories: Category 1: Integral formwork hoisting, double-sided formwork that is suitable for the size of the limited space is made in advance and directly hoisted into the limited space. There are problems such as difficulty in reinforcing the outer formwork, staggered joints and leakage, and difficulty in dismantling.

[0005] Category 2: Other standardized support components are not connected to the outer formwork and rely on their own strength to resist the concrete deadweight pressure. There are quality problems such as deformation after being squeezed by concrete and cannot be removed, or the wall tilts after being offset. Summary of the invention

[0006] In order to improve the problem that the formwork is not firmly reinforced and the formwork is difficult to remove, the present invention provides a construction method for installing and removing the formwork in a limited space of a post-cast structure.

[0007] The invention provides a method for installing and removing formwork in a limited space of a post-cast structure, which adopts the following technical solution: A method for installing and removing formwork in a limited space of a post-cast structure comprises the following steps: Step 1: Process the inner and outer formwork of the post-cast structure in advance according to the size of the post-cast structure and the width of the limited space structure joint; Step 2: Simply fix the inner formwork in the limited space, close to the steel bar protective layer pad; Step 3: Fix the outer template close to both ends of the inner template, adjust the inner template according to the marked position of the outer template, ensure that there is no gap after adjustment, and the outer template is close to the steel bar protective layer pad; Step 4: Install the reinforcement device so that the inner and outer formwork of the post-cast structure and the existing concrete structure form a column-wrapped reinforcement to ensure the overall stress stability of the formwork; Step 5: Pour sand into the limited space formed by the inner formwork of the post-cast structure, the existing concrete structure and the outer formwork, and tamp it with water so that the sand can support the lateral pressure of the concrete's deadweight; Step 6: pour the post-cast structural concrete and fully vibrate and maintain; Step 7: Remove the reinforcement device and the outer formwork of the post-cast structure. The sand body in the limited space will be naturally unloaded and the inner formwork can be easily removed.

[0008] Furthermore, the inner formwork is arranged in a limited space, and the upper and lower ends are connected to the outer formwork by screws, one side is abutted against the steel bar protective layer pad, and the other side has a limited space between it and the existing concrete structure.

[0009] Furthermore, the outer formwork is wrapped around the periphery of the existing concrete structure and the post-cast structure, and the outer formwork, the existing concrete structure and the inner formwork enclose a limited space for pouring sand bodies.

[0010] Furthermore, the reinforcement device includes wooden slats, which are arranged on the periphery of the outer template and fastened to the outer template by screws.

[0011] Furthermore, the reinforcement device also includes a reinforcement steel pipe, which is arranged on the periphery of the wooden slats and connected to the wooden slats through tension screws.

[0012] Furthermore, in the step five, sand is poured through a conical funnel, the bottom of the conical funnel is a steel pipe, and the steel pipe extends into the bottom during the sand pouring.

[0013] Furthermore, the length of the outer formwork extending to the existing concrete structure is not less than 300 mm.

[0014] Furthermore, the wooden slats are evenly distributed around the outer formwork.

[0015] In summary, the present invention includes at least one of the following beneficial technical effects: 1. Inner and outer formwork are set in the limited space between the post-cast structure and the existing structure. The outer formwork wraps the inner formwork and forms a column reinforcement system with the reinforced steel pipe and the existing structure, making the formwork force system of the post-cast structure more secure; 2. The inner formwork is fixed in advance at the marked position through the outer formwork, and is initially fixed through the reinforcement system, which is convenient for installation; the inner formwork and the existing structure form a limited enclosed space, and the sand is filled and compacted in layers through the inserted conical funnel, and the sand is compacted to form a simple sand box support force system, which replaces traditional wood squares and steel pipe reinforcements, etc., and reduces material loss; only the inner formwork needs to be reinforced in the limited space, and no other auxiliary reinforcements such as wooden planks, wood squares, steel pipes, and pads are required, which is convenient for installation; 3. After the post-cast structure is constructed, the outer formwork can be removed to allow the sand in the limited confined space to naturally unload and fall off, and the inner formwork can be easily removed; the formwork in the limited space is easy to install and remove, with less loss of formwork, which improves the turnover efficiency of materials; 4. Reasonably select reinforcement methods according to the size of the structure, turn the unfavorable factors of the adjacent structure into advantages, and form an overall reinforcement system for the columns; use the simple sand box principle of sand compaction to form a support system during compaction, and naturally unload the force after unloading the sand, providing space for the removal of the formwork. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a top view of the overall structure of an embodiment of the present invention; Figure 2 is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 3 Schematic diagram of a conical funnel according to an embodiment of the present invention.

[0017] Figure numerals: 1. existing concrete structure; 2. steel bar protective layer pad; 3. inner formwork; 4. limited space (sand body); 5. outer formwork; 6. wooden slats; 7. post-cast structure; 8. reinforced steel pipe; 9. conical funnel; 10. steel pipe. DETAILED DESCRIPTION

[0018] The following is combined with Figure 1-3 The present invention is described in further detail.

[0019] The embodiment of the present invention discloses a method for installing and removing formwork in a limited space of a post-cast structure. Figure 1 , Figure 2 , Figure 3 The construction method for installing and removing the formwork in a limited space of a post-cast structure includes the following steps: Step 1: According to the design documents and the size of the post-cast structure 7, a glued formwork inner formwork 3 of the same width as the post-cast structure 7 is manufactured in advance, and a glued formwork outer formwork 5 is manufactured to fit the existing concrete structure 1 and the post-cast structure 7. The overlap length between the outer formwork 5 and the existing concrete structure 1 is not less than 300 mm.

[0020] Step 2: Insert the inner formwork 3 into the limited space, and initially fix it close to the steel bar protective layer pad 2. Mark the connection position between the outer formwork and the inner formwork in advance.

[0021] Step 3: Install the outer formwork 5, and fix it tightly to the two ends of the inner formwork 3 and the existing concrete structure 1. The outer formwork 5 and the inner formwork 3 are fixed by screws. The outer formwork 5 and the inner formwork 3 are fixed according to the pre-marked positions. After adjustment, confirm that there is no gap.

[0022] Step 4: Fasten the wooden slats 6 to the periphery of the outer formwork 5 with screws. The wooden slats 6 are evenly distributed on the periphery of the outer formwork 5. Reinforced steel pipes 8 are installed on the periphery of the wooden slats 6 by tensioning screws, so that the outer formwork 5 and the existing concrete structure 1 and the post-cast structure 7 form a column reinforcement system. The longitudinal spacing of the reinforced steel pipes 8 is not more than 500mm to ensure the overall force stability of the formwork.

[0023] Step 5: The outer formwork 5, the inner formwork 3 and the existing concrete structure 1 form a limited space 4, and sand is poured through the conical funnel 9. The bottom of the conical funnel 9 is a steel pipe 10. When pouring sand, the steel pipe 10 goes deep into the bottom and gradually rises with the rise of the sand body 4. By knocking the steel pipe 10 and changing the position of the steel pipe 10, the sand body rises evenly to ensure the density. After the sand filling is completed, water it fully and compact it, so that the inner formwork 3 is reinforced and reliable, enough to bear the lateral pressure of the concrete deadweight.

[0024] Step 6: Pour the post-cast structure 7 concrete, vibrate it thoroughly and then cure it.

[0025] Step 7: After reaching the demolding strength, first remove the reinforcement steel pipe 8, then remove the outer template 5, open both ends of the limited space (sand body) 4, and the sand body 4 will naturally unload and fall off. After the sand body 4 falls off, the lateral pressure of the inner template 3 is eliminated, and there is enough space for removal, and the inner template can be easily removed.

[0026] Step 8: Since the reinforcement method at the limited space 4 causes less damage to the template, it can be recycled with the sand body 4 after being collected and sorted.

[0027] The present invention uses an inserted conical funnel to fill sand into layers and compact the sand, and forms a simple sand box support force system by tamping the sand, which replaces traditional wooden squares, steel pipe reinforcements, etc., and reduces material loss. In a limited space, only the inner template needs to be reinforced, and no other auxiliary reinforcements such as other wooden slats, wooden squares, steel pipes, and pads are required, and the installation is convenient. The template is easy to install and disassemble in a limited space, with less loss of the template, thereby improving the turnover efficiency of materials.

[0028] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A construction method for installing and removing formwork in a limited space of a post-cast structure, characterized in that: The following steps are involved: Step 1: Process the inner and outer formwork of the post-cast structure in advance according to the size of the post-cast structure and the width of the limited space structure joint; Step 2: Simply fix the inner formwork in the limited space, close to the steel bar protective layer pad; Step 3: Fix the outer template close to both ends of the inner template, adjust the inner template according to the marked position of the outer template, ensure that there is no gap after adjustment, and the outer template is close to the steel bar protective layer pad; Step 4: Install the reinforcement device so that the inner and outer formwork of the post-cast structure and the existing concrete structure form a column-wrapped reinforcement to ensure the overall stress stability of the formwork; Step 5: Pour sand into the limited space formed by the inner formwork of the post-cast structure, the existing concrete structure and the outer formwork, and tamp it with water so that the sand can support the lateral pressure of the concrete's deadweight; Step 6: pour the post-cast structural concrete and fully vibrate and maintain; Step 7: Remove the reinforcement device and the outer formwork of the post-cast structure. The sand body in the limited space will be naturally unloaded and the inner formwork can be easily removed.

2. The method for installing and removing formwork in a limited space of a post-cast structure according to claim 1 is characterized in that: The inner formwork is arranged in a limited space, and the upper and lower ends are connected to the outer formwork by screws, one side abuts against the steel bar protective layer pad, and the other side has a limited space between it and the existing concrete structure.

3. The method for installing and removing formwork in a limited space of a post-cast structure according to claim 1 is characterized in that: The outer formwork is wrapped around the periphery of the existing concrete structure and the post-cast structure. The outer formwork, the existing concrete structure and the inner formwork enclose a limited space for pouring sand bodies.

4. The method for installing and removing formwork in a limited space of a post-cast structure according to claim 1 is characterized in that: The reinforcing device comprises wooden slats, which are arranged on the periphery of the outer template and fastened to the outer template by screws.

5. The method for installing and removing formwork in a limited space of a post-cast structure according to claim 4 is characterized in that: The reinforcement device also includes a reinforcement steel pipe, which is arranged on the periphery of the wooden slats and connected to the wooden slats through tension screws.

6. The method for installing and removing formwork in a limited space of a post-cast structure according to claim 1 is characterized in that: In the step 5, sand is poured through a conical funnel, the bottom of the conical funnel is a steel pipe, and the steel pipe extends into the bottom during sand pouring.

7. The method for installing and removing formwork in a limited space of a post-cast structure according to claim 1 is characterized in that: The length of the outer formwork extending to the existing concrete structure is not less than 300 mm.

8. The method for installing and removing formwork in a limited space of a post-cast structure according to claim 5 is characterized in that: The wooden slats are evenly distributed around the outer template.

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