Prefabricated formwork buttress structure construction method for basement and long-strip-shaped foundation

Abstract

A prefabricated formwork buttress structure construction method for a basement and a long-strip-shaped foundation is characterized by comprising the following steps of a, bearing platform bottom cushion layer cleaning, b, earthwork excavation, c, sample trial placement and prefabricated formwork cutting and blanking, d, bedding and plate splicing, e, rechecking and correcting, f, splicing seam reinforcing, g, corner base repairing and reinforcing, h, inner support reinforcing, i, earthwork backfilling and j, bearing platform peripheral bottom plate cushion layer pouring. K, dismantling the inner supporting frame body; and l, constructing a subsequent working procedure. The construction method of the prefabricated formwork buttress structure for the basement and the long-strip-shaped foundation has the advantages that the formwork independence is improved, the formwork rigidity is effectively guaranteed, deformation and displacement of the formwork in the earthwork backfilling stage are avoided, the bearing platform formwork construction quality is guaranteed, the working procedures are reduced, the construction period is shortened, and garbage is reduced.

Description

Technical Field

[0001] The invention relates to a prefabricated template construction method, in particular to a prefabricated template buttress structure construction method for a basement and a long strip foundation. Background Art

[0002] In the early days, brick formwork or wooden formwork was conventionally used for reinforcement in the areas around the basement floor or long strip caps. Both methods have some disadvantages. The wooden formwork needs to be removed for waterproofing and backfilling, which requires many processes and late backfilling. In addition, if it is in the rainy season, the bottom plate reinforcement will be easily contaminated by mud after rainwater erosion after the reinforcement is tied. The brick formwork needs to be plastered, which has many processes and high costs. It requires a large amount of labor input, and there are many objective factors affecting the project, making it difficult to control the construction period and cost. In order to improve the construction efficiency of the cap formwork, prefabricated panels have been used as prefabricated formwork for the basement floor side wall and cap formwork. However, when constructing the long strip foundation side formwork, it is easy to have a large length and poor self-reliance during the construction and backfilling stages.

[0003] Prefabricated panels, prefabricated panel membranes are generally made of fine aggregate cement hollow prefabricated panel membranes. They are made by evenly mixing fly ash, cement, and construction debris and then forming them under the uniform extrusion of a production machine. They have good integrity and are a green building material that reuses construction debris.

[0004] Common brick formwork materials are 90mm thick, 600mm wide and 2000mm-3200mm long, which can be produced in fixed lengths according to the size of the on-site foundation. Currently, many projects have adopted new prefabricated formworks, but for long strip foundations, the construction of prefabricated formworks is prone to poor self-sustainability.

[0005] Therefore, the known prefabricated formwork construction method has the above-mentioned inconveniences and problems. Summary of the invention

[0006] The purpose of the present invention is to provide a construction method for a prefabricated formwork buttress structure for a basement and a long strip foundation with enhanced self-sustainability.

[0007] To achieve the above purpose, the technical solution of the present invention is: A method for constructing a prefabricated formwork buttress structure for a basement and a long strip foundation, characterized by comprising the following steps: a. Cleaning of the bottom cushion of the pedestal The cushion surface where the prefabricated formwork foundation is to be installed must be thoroughly cleaned, and the surface of the cushion concrete structure where the prefabricated formwork is in contact with the wall panel must be flat and compact; b. Earthwork excavation Provide technical guidance to earthwork construction units during the earthwork excavation phase, and strictly prohibit over-excavation and random excavation; c. Trial sample placement and prefabricated template cutting According to the length of the side formwork of the basement floor, the length and height of the pedestal, and the width of the wall panel, the prefabricated template is cut and blanked, and the size of the parts that need to be connected is measured in advance; d. Sit-on-pulp board When installing the prefabricated formwork, apply adhesive to the top and side edges of the prefabricated formwork evenly without hanging. When erecting the prefabricated formwork as a wall panel, use a crowbar to squeeze it into place. Use a laser three-line instrument to promptly correct the verticality and the flatness of the adjacent board surfaces to ensure that the joints are tight and straight. e. Review and Correction For prefabricated formwork paneling work in areas with large cushion elevation errors, wooden wedges are used to tighten the bottom of the prefabricated formwork panels, and the adhesive squeezed out of the gaps is scraped flat. After the prefabricated formwork is initially in place as a wall panel, the wall surface is leveled and verticalized using a square and a line support board; f. Seam reinforcement After the prefabricated formwork is installed, the joints are filled with adhesive and covered with grid tape to improve the integrity of the joints; for the inner and outer corners of the prefabricated formwork, secondary filling and repair reinforcement are carried out to ensure that the inner and outer corners are square and improve the integrity of the foundation formwork; g. Repair and strengthen the corner base Strengthen the quality self-inspection of the bottom of the prefabricated formwork, clean the dust on the bottom after the paneling work is completed, repair the joints of 50mm at the bottom of the cushion layer and 50mm on the vertical surface of the plate for secondary grouting, and clean the surface of the cushion layer; h. Internal support reinforcement After the prefabricated formwork model is completed, the key data of the prefabricated formwork top elevation, the internal dimensions of the pedestal formwork, the squareness of the corners, the flatness of the plate joints and the verticality of the plate are reviewed. After acceptance, steel pipes and wooden squares are used in time for internal reinforcement to increase support at the joints; i. Backfill After the precast slab cap formwork is installed, avoid using the cap formwork as a force fulcrum to directly squeeze the soil, avoid the collision of the soil transport hopper with the precast slab cap formwork, and slowly slide down from the slope to the edge of the precast slab cap formwork, backfill all around at the same time, and cooperate with manual leveling; j. Casting of the outer bottom slab cushion layer of the pedestal After the backfilling is completed, pour the bottom slab cushion concrete according to the designed elevation to ensure that the bottom slab cushion concrete covers the entire precast formwork of the cap to improve the effective connection integrity between the cushion and the precast formwork of the cap; k. Dismantling of the inner support frame The internal support should be removed after the prefabricated formwork foundation formwork is installed, the earth backfill is completed and the bottom plate cushion layer is solidified; l. Construction of post-process Waterproofing and post-process construction began.

[0008] The construction method of the prefabricated formwork buttress structure for basements and long strip foundations of the present invention can also be further implemented by adopting the following technical measures.

[0009] The aforementioned method, wherein the binder is hydroxypropyl methylcellulose.

[0010] In the aforementioned method, the adhesive coating thickness shall not be less than 30 mm.

[0011] In the aforementioned method, when the prefabricated template foundation mold is installed, the top height of the prefabricated template is controlled by the bottom height of the cushion layer, and the error shall not be greater than 30mm.

[0012] In the aforementioned method, the spacing between the internal support reinforcements shall not be greater than 3m.

[0013] In the above method, the support at the joint is made of wooden beams or steel pipe diagonal braces.

[0014] After adopting the above technical solution, the construction method of the prefabricated formwork buttress structure for basements and long strip foundations of the present invention has the following advantages: 1. By assembling the whole board along the length direction and installing a buttress board with a width of 250mm perpendicular to the length direction of the prefabricated formwork, the self-supporting property of the formwork is increased, the rigidity of the formwork is effectively guaranteed, and the deformation and displacement of the formwork during the backfilling stage is avoided; 2. Ensure the construction quality of the project foundation template, reduce the process, and effectively save the construction period; 3. Construction slag and other materials are used in the production stage of prefabricated formwork, which effectively saves energy and reduces waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the prefabricated template structure according to an embodiment of the present invention; Figure 2 It is a plan view of the bottom plate side formwork and the long strip pedestal prefabricated formwork structure of an embodiment of the present invention; Figure 3 for Figure 2 Sectional view of 1-1; Figure 4 It is a three-dimensional schematic diagram of a prefabricated formwork buttress structure for a basement and a long strip foundation according to an embodiment of the present invention. DETAILED DESCRIPTION

[0016] The present invention is further described below in conjunction with embodiments and accompanying drawings.

[0017] Example 1 The application scope of the prefabricated formwork buttress structure construction method for basements and long strip foundations of the present invention: the prefabricated formwork installation and reinforcement method is suitable for prefabricated formwork in parts such as basement floor side formwork or long strip pedestals, has better integrity and self-reliance, and is simple to use in areas such as basement floors, which can reduce multiple processes such as formwork support.

[0018] The construction principle of the prefabricated formwork buttress structure construction method for basements and long strip foundations of the present invention is as follows: the prefabricated formwork is used for the side formwork of the basement floor or the long strip pedestal and other parts. Because the prefabricated formwork is assembled in a long length, if no stabilization measures are provided in the middle, it is easy to cause deformation and displacement during the backfilling stage, and the self-reliance of the formwork cannot be guaranteed. The prefabricated pedestal formwork plate has a width of 600mm and a length of 2000mm. It can be customized according to the project size with a maximum length of 3200. This construction method uses a whole plate for installation in the length direction, and increases the protruding plate 250 width in the vertical length direction. The buttress construction measures of the same height as the long direction are used to increase the rigidity and stability in the length direction of the side membrane of the floor and the long strip pedestal.

[0019] Material requirements for the construction method of the prefabricated formwork buttress structure for basements and long strip foundations of the present invention: 1) Formwork: 90mm thick prefabricated foundation formwork; 2) Adhesive: Adhesive: Hydroxypropyl methylcellulose, bonding strength 148,000 MPa.

[0020] 3) Wood: 40mm*90mm square wood (internal support); 4) Steel pipe: standard Φ48*3.6mm galvanized steel pipe (internal support).

[0021] The process flow of the prefabricated formwork buttress structure construction method for basements and long strip foundations of the present invention is as follows: cleaning of the cushion layer at the bottom of the pedestal - measuring and positioning, determining the height - mechanical earth excavation to 300mm above the bottom of the pedestal - manual soil clearing and leveling - pouring of concrete cushion layer - placing of prefabricated slab pedestal mold line - trial layout - plate cutting and unloading - mortar assembly and assembly of whole plates - end buttress plates - continuous construction of the previous process to completion - internal support reinforcement - backfilling of the pedestal and ground beam sides - removal of internal support frame → site leveling → foundation cushion layer.

[0022] Please refer to Figure 1-4 The construction method of the prefabricated formwork buttress structure for basements and long strip foundations of the present invention comprises the following steps: 1. Cleaning the bottom cushion of the pedestal The cushion surface where the precast slab cap formwork is to be installed must be thoroughly cleaned, and the concrete structure of the cushion layer that the wall panels are in contact with must be flat, dense, and strong enough for working. At the same time, there must be no obvious accumulation of water in the working area, and work should be avoided on rainy days.

[0023] 2. Earth excavation During the earth excavation stage, professional surveyors should be assigned to provide technical guidance to the earthwork units, and over-excavation and random excavation are strictly prohibited.

[0024] 3. Trial sample placement and plate cutting According to the length of the side formwork of the basement floor, the length and height of the pedestal, and the width of the wall panel (standard panel width is 600mm), the panels are cut and blanked. The dimensions of the parts that need to be connected should be measured in advance to avoid material waste.

[0025] 4. Sit-on-pulp board When installing the panels, the top and side edges should be fully coated with adhesive (adhesive name: hydroxypropyl methylcellulose; adhesive strength: 148,000 MPa, detailed product inspection report attached), and the application should be even without hanging, and the thickness of the adhesive should not be less than 30 mm. When the wall panels are erected, use a crowbar to squeeze them into place, and use a laser three-line instrument to promptly correct the verticality and the flatness of the adjacent panels to ensure that the joints are tight and straight.

[0026] 5. Review and Correction For panel assembly work in areas where the elevation error of the cushion layer is large, wooden wedges should be used to tighten the bottom of the board in time, and the adhesive squeezed out of the gap should be scraped and filled in time.

[0027] After the wall panels are initially in place, the wall surface should be leveled and vertically adjusted using a square and a guide plate.

[0028] When installing the precast slab foundation formwork, the top height of the slab shall be controlled by the bottom height of the cushion layer, and the error shall not exceed 30mm.

[0029] 6. Seam reinforcement After the installation of the panels is completed, the joints should be filled with adhesive and covered with grid tape in time to improve the integrity of the joints. For the inner and outer corners, secondary grouting repair and reinforcement should be carried out to ensure that the inner and outer corners are square and improve the integrity of the base mold.

[0030] 7. Corner base repair and reinforcement For the bottom part, quality self-inspection should be strengthened. After the paneling work is completed, the dust on the bottom should be cleaned in time. At the same time, the joints of 50mm at the bottom of the cushion layer and 50mm on the vertical surface of the board should be repaired for the second time. After the work is completed, the surface of the cushion layer should be cleaned in time to prepare for subsequent work in advance.

[0031] 8. Internal support reinforcement After the installation model is completed, check the key data such as the top elevation of the slab, the size of the space inside the pedestal mold, the squareness of the corners, the flatness of the plate joints and the verticality of the plates. After acceptance, use steel pipes and wooden planks to reinforce the internal supports in time. The spacing between the reinforced internal supports shall not be greater than 3m, and appropriate support shall be added at the joints. The support at the joints shall be 50x100mm wooden planks or standard steel pipe diagonal braces @400mm (one end is supported at the joint and the other end is supported at the pipe pile).

[0032] 9. Backfilling 8 hours after the installation of the prefabricated slab cap formwork is completed (at this time, the adhesive strength reaches the maximum value and meets the force requirements before backfilling construction can be carried out. Care should be taken to avoid using the cap formwork as a force fulcrum to directly squeeze the soil, and the collision of the soil transport hopper with the formed prefabricated slab cap formwork should be avoided. Slowly slide down from the slope into the edge of the prefabricated slab cap formwork, backfill all around at the same time, and cooperate with manual leveling. After the prefabricated slab cap formwork is backfilled, no large machinery shall be used to operate to reduce the extrusion and damage to the cap formwork: 10. Casting of the outer bottom plate cushion layer of the pedestal After the backfill is completed, pour the bottom slab cushion concrete according to the designed elevation to ensure that the bottom slab cushion concrete covers the entire cap formwork to improve the effective connection integrity between the cushion and the cap formwork.

[0033] 11. Removal of the internal support frame The internal support should be removed 8 hours after the precast slab foundation formwork is installed (at this time the adhesive strength reaches its maximum value and meets the AILI requirements) and after the backfill is completed and the bottom plate cushion layer solidifies.

[0034] 12. Post-process construction Waterproofing and post-process construction began.

[0035] The present invention has substantial characteristics and significant technical progress. The buttress-type construction method for the basement floor side formwork and the long strip foundation prefabricated formwork of the present invention is convenient to construct compared with the traditional method. For the buttress construction method of the long strip foundation pedestal prefabricated formwork, the prefabricated formwork is arranged: after the foundation cushion layer is poured, the length of the whole plate is selected according to the length of the floor side formwork and the size of the long strip pedestal, and the buttress plate is cut; the whole plate is installed by mortaring on the top, and the buttress plate is installed by paving the end of the plate with adhesive, and the whole plate is bonded with adhesive. During the prefabricated formwork construction stage, the end wall in the vertical and long side direction is spliced ​​as a buttress structure, which effectively ensures the independence and integrity of the prefabricated formwork construction, and has the characteristics of fewer processes, saving construction period, and better economy.

[0036] The prefabricated template buttress structure construction method for basement and long strip foundation of the present invention is used in the Guangzhou Convention and Exhibition Center project with remarkable effect. It is used in the side mold area of ​​the basement floor and the long strip pedestal and other parts. The construction is simple and convenient, with fewer processes and more economical costs. By adopting the whole plate splicing in the length direction and adding the buttress plate perpendicular to the length direction, the strength, rigidity and stability of the prefabricated template installation are effectively guaranteed. The visual quality is good, the application range is wide, the use is easy to master, and it is easy to promote and use. It has been unanimously recognized by the supervision unit and the construction unit, and has been welcomed by the operators, and has achieved good economic benefits and social impact.

[0037] The above embodiments are only for the purpose of illustrating the present invention, but not for limiting the present invention. A person skilled in the art may make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to the scope of the present invention and should be defined by the claims.

Claims

1. A method for constructing a prefabricated formwork buttress structure for a basement and a long strip foundation, characterized in that The following steps are involved: a. Cleaning of the bottom cushion of the pedestal The cushion surface where the prefabricated formwork foundation is to be installed must be thoroughly cleaned, and the surface of the cushion concrete structure where the prefabricated formwork is in contact with the wall panel must be flat and compact; b. Earthwork excavation Provide technical guidance to earthwork construction units during the earthwork excavation phase, and strictly prohibit over-excavation and random excavation; c. Trial sample placement and prefabricated template cutting According to the length of the side formwork of the basement floor, the length and height of the pedestal, and the width of the wall panel, the prefabricated template is cut and blanked, and the size of the parts that need to be connected is measured in advance; d. Sit-on-pulp board When installing the prefabricated formwork, apply adhesive to the top and side edges of the prefabricated formwork evenly without hanging. When erecting the prefabricated formwork as a wall panel, use a crowbar to squeeze it into place. Use a laser three-line instrument to promptly correct the verticality and the flatness of the adjacent board surfaces to ensure that the joints are tight and straight. e. Review and Correction For prefabricated formwork paneling work in areas with large cushion elevation errors, wooden wedges are used to tighten the bottom of the prefabricated formwork panels, and the adhesive squeezed out of the gaps is scraped flat. After the prefabricated formwork is initially in place as a wall panel, the wall surface is leveled and verticalized using a square and a line support board; f. Seam reinforcement After the prefabricated formwork is installed, the joints are filled with adhesive and covered with grid tape to improve the integrity of the joints; for the inner and outer corners of the prefabricated formwork, secondary filling and repair reinforcement are carried out to ensure that the inner and outer corners are square and improve the integrity of the foundation formwork; g. Repair and strengthen the corner base Strengthen the quality self-inspection of the bottom of the prefabricated formwork, clean the dust on the bottom after the paneling work is completed, repair the joints of 50mm at the bottom of the cushion layer and 50mm on the vertical surface of the plate for secondary grouting, and clean the surface of the cushion layer; h. Internal support reinforcement After the prefabricated formwork model is completed, the key data of the prefabricated formwork top elevation, the internal dimensions of the pedestal formwork, the squareness of the corners, the flatness of the plate joints and the verticality of the plate are reviewed. After acceptance, steel pipes and wooden squares are used in time for internal reinforcement to increase support at the joints; i. Backfill After the precast slab cap formwork is installed, avoid using the cap formwork as a force fulcrum to directly squeeze the soil, avoid the collision of the soil transport hopper with the precast slab cap formwork, and slowly slide down from the slope to the edge of the precast slab cap formwork, backfill all around at the same time, and cooperate with manual leveling; j. Casting of the outer bottom slab cushion layer of the pedestal After the backfilling is completed, pour the bottom slab cushion concrete according to the designed elevation to ensure that the bottom slab cushion concrete covers the entire precast formwork of the cap to improve the effective connection integrity between the cushion and the precast formwork of the cap; k. Dismantling of the inner support frame The internal support should be removed after the prefabricated formwork foundation formwork is installed, the earth backfill is completed and the bottom plate cushion layer is solidified; 1. Construction of post-process Waterproofing and post-process construction began.

2. The construction method of the prefabricated formwork buttress structure for basements and long strip foundations according to claim 1, characterized in that: The binder is hydroxypropyl methylcellulose.

3. The construction method of the prefabricated formwork buttress structure for basements and long strip foundations according to claim 1, characterized in that: The adhesive coating thickness shall not be less than 30 mm.

4. The method for constructing a prefabricated formwork buttress structure for a basement and a long strip foundation according to claim 1, characterized in that: When the prefabricated formwork base formwork is installed, the top height of the prefabricated formwork is controlled by the bottom height of the cushion layer, and the error shall not be greater than 30mm.

5. The construction method of prefabricated formwork buttress structure for basement and long strip foundation according to claim 1, characterized in that: The spacing between the internal support reinforcements shall not be greater than 3m.

6. The construction method of prefabricated formwork buttress structure for basement and long strip foundation according to claim 1, characterized in that: The support at the joints is made of wood or steel pipe diagonal bracing.

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