A method for installing a prefabricated foundation template with a depth of 1200-1800mm

Abstract

A method for installing a prefabricated pedestal template with a depth of 1200-1800 mm, characterized in that it includes the following steps: a. cleaning the cushion layer at the bottom of the pedestal, b. excavation of earthwork, c. trial placement and cutting of plates, d. grouting and splicing, e. review and correction, f. joint reinforcement, g. corner base repair and reinforcement, h. internal support reinforcement, i. backfilling of earthwork, direct force squeezing of earth, j. pouring of the cushion layer of the outer bottom plate of the pedestal, k. removal of the internal support frame, l. subsequent process construction, waterproofing and subsequent process construction. The method for installing a prefabricated pedestal template with a depth of 1200-1800 mm of the present invention has the advantages of saving the amount of prefabricated pedestal templates through the mutual support of the grouting and splicing of the plates and the ends, ensuring the rigidity of the template, avoiding the deformation and displacement of the prefabricated pedestal templates during the backfilling stage, ensuring the construction quality of the prefabricated pedestal templates, reducing the process and saving the construction period.

Description

Technical Field

[0001] The invention relates to a template installation method, in particular to a 1200-1800mm deep prefabricated foundation template installation method. Background Art

[0002] In the early days, brick formwork was used to build the basement foundation beams, pedestals, water collection wells and other parts of the side walls that were not easy to remove. However, the construction period of brick formwork is long, the labor input is large, and there are many objective factors affecting the project, which makes it difficult to control the construction period and cost. In order to improve the efficiency of the pedestal formwork construction, prefabricated panels have been used as prefabricated pedestal membranes for the basement beams, pedestals and water collection wells in some basements. However, for areas with larger pedestal depths, due to the large lateral pressure of the backfill construction soil, insufficient rigidity and deformation and displacement are prone to occur, and the construction size and safety of the pedestal cannot be guaranteed.

[0003] Therefore, the known construction method of using prefabricated panels as prefabricated membranes for the platform has the above-mentioned inconveniences and problems. Summary of the invention

[0004] The purpose of the present invention is to provide a safe and reliable method for installing a prefabricated foundation template with a depth of 1200-1800mm.

[0005] To achieve the above purpose, the technical solution of the present invention is: A method for installing a prefabricated cap template with a depth of 1200-1800mm, adopting a "2+1" method from the bottom to the top of the cap, that is, 2 layers of prefabricated cap templates are arranged at the bottom layer, and 1 layer of prefabricated cap templates are arranged at each of the other upper layers, characterized in that it includes the following steps: a. Cleaning of the bottom cushion of the pedestal The cushion surface where the prefabricated cap formwork will be installed must be thoroughly cleaned, and the concrete surface of the cushion layer that the wall panels are in contact with must be flat, dense, and strong enough to meet the working conditions; b. Earthwork excavation During the earthwork excavation phase, full-time surveyors should be assigned to provide technical guidance to earthwork units, and over-excavation and random excavation are strictly prohibited; c. Trial sample placement and plate cutting According to the height of the pedestal and the ground beam, and the width of the wall panel, the prefabricated pedestal template should be cut and blanked. The size of the part that needs to be connected should be measured in advance; d. Sit-on-pulp board When installing the prefabricated cap template, the top and side edges should be fully coated with adhesive, and the adhesive should be evenly applied without hanging; when the prefabricated cap template is erected as a wall panel, it should be squeezed into place with a crowbar, and the verticality and the flatness of the adjacent board surface should be corrected with a laser three-line instrument to ensure that the joints of the prefabricated cap template are tight and straight; e. Review and Correction For the paneling work in the part with large elevation error of cushion layer, wooden wedges are used to tighten the bottom of prefabricated pedestal template, and the adhesive squeezed out of the gap of prefabricated pedestal template is scraped flat. After the prefabricated pedestal template is initially put in place as wall panel, the wall surface is leveled and verticalized using angle ruler and line support board; f. Seam reinforcement After the prefabricated pedestal template is installed, adhesive should be used in time to fill the joints of the prefabricated pedestal template and slurry should be applied, and mesh tape should be covered to improve the integrity of the joints; secondary grouting repair and reinforcement treatment should be carried out for the inner and outer corners of the prefabricated pedestal template to ensure that the inner and outer corners are square and improve the integrity of the prefabricated pedestal template; g. Repair and strengthen the corner base The bottom part should be inspected for quality. After the prefabricated foundation template is assembled, the dust on the bottom should be cleaned. The joint of 50mm at the bottom of the cushion layer and 50mm at the vertical surface of the prefabricated foundation template should be repaired for the second time, and the surface of the cushion layer should be cleaned. h. Internal support reinforcement After the prefabricated cap template is installed, check the elevation of the prefabricated cap template, the size of the space inside the cap template, the squareness of the inner and outer corners, the flatness and verticality of the prefabricated cap template joints; use steel pipes or wooden squares for internal reinforcement to increase support at the joints; i. Backfill After the prefabricated slab cap template is installed, avoid using the cap template as a force fulcrum to directly squeeze the soil, avoid the collision of the soil hopper with the prefabricated cap template, and slowly slide down the slope to the edge of the prefabricated cap template, 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 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 precast slab cap formwork to improve the integrity of the cushion and the precast slab cap formwork; k. Dismantling of the inner support frame The internal support should be removed after the precast slab foundation formwork is installed and the earth backfill is completed and the bottom slab cushion layer is solidified; 1. Construction of post-process Waterproofing and post-process construction began.

[0006] The 1200-1800mm depth prefabricated foundation template installation method of the present invention can also be further implemented by adopting the following technical measures.

[0007] The aforementioned method, wherein the binder is hydroxypropyl methylcellulose.

[0008] In the aforementioned method, the adhesive coating thickness shall not be less than 30 mm.

[0009] In the aforementioned method, when the prefabricated foundation template is installed, the top height of the prefabricated foundation template is controlled by the bottom height of the cushion layer, and the error shall not be greater than 30mm.

[0010] In the aforementioned method, the spacing between the reinforcing inner supports shall not be greater than 3m.

[0011] In the above method, the support at the joint is made of wooden beams or steel pipe diagonal braces.

[0012] After adopting the above technical solution, the 1200-1800mm deep prefabricated cap template installation method of the present invention has the following advantages: 1. By supporting each other with the mortar panels and the ends, the amount of prefabricated foundation templates can be saved, the rigidity of the templates can be ensured, and the deformation and displacement of the prefabricated foundation templates during the backfilling stage can be avoided; 2. Ensure the construction quality of prefabricated foundation formwork, reduce the number of working procedures and save construction time. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram of a prefabricated cap template according to an embodiment of the present invention; Figure 2 This is a plan view of the 1200-1800mm prefabricated template structure according to an embodiment of the present invention; Figure 3 This is a plan view of the deep bottom structure of a 1200-1800 mm prefabricated template according to an embodiment of the present invention; Figure 4 This is a plan view of the upper structural layers of the 1200-1800 mm prefabricated template according to an embodiment of the present invention; Figure 5 for Figure 2 Sectional view of AA. DETAILED DESCRIPTION

[0014] The present invention is further described below in conjunction with embodiments and accompanying drawings.

[0015] Example 1 The process flow of the 1200-1800mm deep prefabricated pedestal template installation method of the present invention is as follows: cleaning of the cushion layer at the bottom of the pedestal - measuring and positioning, determining the calibration 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 - verification and correction - joint reinforcement - repair and reinforcement of one corner base (bottom layer - middle layer - top layer) - internal support reinforcement - backfilling of the pedestal and ground beam side - removal of internal support frame → site leveling → foundation cushion layer.

[0016] The prefabricated foundation template arrangement of the 1200-1800mm depth prefabricated foundation template installation method of the present invention is as follows: 1) The bottom layer is arranged with 2 layers of prefabricated panels. If the length and width of the base are less than 3200mm, the whole panel can be used for installation. If the length of the whole panel is not met, the joints of the panels need to be staggered. The joints are firmly bonded with adhesives, and temporary supports of square wood and steel pipes are set inside. The support spacing is not more than 3m.

[0017] 2) The upper layers are arranged with 1 layer of prefabricated panels. If the length and width of the base are less than 3200mm, the whole panel can be used for installation. If the whole panel is not required, the panel joints need to be staggered and firmly bonded with adhesives. Temporary supports of square wood and steel pipes are set inside, and the support spacing is not more than 3m.

[0018] Please refer to Figure 1-5 The present invention provides a 1200-1800mm deep prefabricated pedestal template installation method, which adopts a "2+1" method from the bottom to the top of the pedestal, that is, two layers of prefabricated pedestal templates are arranged at the bottom, and one layer of prefabricated pedestal templates is arranged at each of the other upper layers, including 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 surface 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.

[0019] 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.

[0020] 3. Trial sample placement and plate cutting Cut the panels according to the height of the pedestal and ground beam and the width of the wall panels (standard panel width is 600mm). The dimensions of the parts that need to be connected should be measured in advance to avoid material waste.

[0021] 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.

[0022] 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.

[0023] After the wall panels are initially in place, the wall surface should be leveled and vertically adjusted using a square and a guide plate.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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).

[0028] 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.

[0029] 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.

[0030] 12. Post-process construction The waterproofing and subsequent process construction begins. The present invention has substantial characteristics and significant technical progress. The present invention is a method for installing a 1200-1800mm deep prefabricated foundation template. The prefabricated board arrangement of the 1200-1800mm depth prefabricated cap template installation method of the present invention: 1) The bottom layer is arranged with 2 layers of prefabricated panels. If the length and width of the base are less than 3200mm, the whole panel can be used for installation. If the length of the whole panel is not met, the joints of the panels need to be staggered. The joints are firmly bonded with adhesives, and temporary supports of square wood and steel pipes are set inside. The support spacing is not more than 3m.

[0031] 2) The upper layers are arranged with 1 layer of prefabricated panels. If the length and width of the base are less than 3200mm, the whole panel can be used for installation. If the whole panel is not required, the panel joints need to be staggered and firmly bonded with adhesives. Temporary supports of square wood and steel pipes are set inside, and the support spacing is not more than 3m.

[0032] The 1200-1800mm deep prefabricated pedestal template installation method of the present invention is used in the Guangzhou Convention and Exhibition Center project with remarkable effect. Through the "2+1" construction approach, the strength, rigidity and stability of the 1200mm-1800mm deep prefabricated pedestal 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 operating personnel, and has achieved good economic benefits and social impact.

[0033] 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 installing a 1200-1800mm deep prefabricated cap template, which adopts a "2+1" method from the bottom to the top of the cap, that is, two layers of prefabricated cap templates are set at the bottom, and one layer of prefabricated cap templates is set at each of the other upper layers, characterized in that The following steps are involved: a. Cleaning of the bottom cushion of the pedestal The cushion surface where the prefabricated cap formwork will be installed must be thoroughly cleaned, and the concrete surface of the cushion layer that the wall panels are in contact with must be flat, dense, and strong enough to meet the working conditions; b. Earthwork excavation During the earthwork excavation phase, full-time surveyors should be assigned to provide technical guidance to earthwork units, and over-excavation and random excavation are strictly prohibited; c. Trial sample placement and plate cutting According to the height of the pedestal and the ground beam, and the width of the wall panel, the prefabricated pedestal template should be cut and blanked. The size of the part that needs to be connected should be measured in advance; d. Sit-on-pulp board When installing the prefabricated cap template, the top and side edges should be fully coated with adhesive, and the adhesive should be evenly applied without hanging; when the prefabricated cap template is erected as a wall panel, it should be squeezed into place with a crowbar, and the verticality and the flatness of the adjacent board surface should be corrected with a laser three-line instrument to ensure that the joints of the prefabricated cap template are tight and straight; e. Review and Correction For the paneling work in the part with large elevation error of cushion layer, wooden wedges are used to tighten the bottom of prefabricated pedestal template, and the adhesive squeezed out of the gap of prefabricated pedestal template is scraped flat. After the prefabricated pedestal template is initially put in place as wall panel, the wall surface is leveled and verticalized using angle ruler and line support board; f. Seam reinforcement After the prefabricated pedestal template is installed, adhesive should be used in time to fill the joints of the prefabricated pedestal template and slurry should be applied, and mesh tape should be covered to improve the integrity of the joints; secondary grouting repair and reinforcement treatment should be carried out for the inner and outer corners of the prefabricated pedestal template to ensure that the inner and outer corners are square and improve the integrity of the prefabricated pedestal template; g. Repair and strengthen the corner base The bottom part should be inspected for quality. After the prefabricated foundation template is assembled, the dust on the bottom should be cleaned. The joint of 50mm at the bottom of the cushion layer and 50mm at the vertical surface of the prefabricated foundation template should be repaired for the second time, and the surface of the cushion layer should be cleaned. h. Internal support reinforcement After the prefabricated cap template is installed, check the elevation of the prefabricated cap template, the size of the space inside the cap template, the squareness of the inner and outer corners, the flatness and verticality of the prefabricated cap template joints; use steel pipes or wooden squares for internal reinforcement to increase support at the joints; i. Backfill After the prefabricated slab cap template is installed, avoid using the cap template as a force fulcrum to directly squeeze the soil, avoid the collision of the soil hopper with the prefabricated cap template, and slowly slide down the slope to the edge of the prefabricated cap template, 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 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 precast slab cap formwork to improve the integrity of the cushion and the precast slab cap formwork; k. Dismantling of the inner support frame The internal support should be removed after the precast slab foundation formwork is installed and the earth backfill is completed and the bottom slab cushion layer is solidified; 1. Construction of post-process Waterproofing and post-process construction began.

2. The 1200-1800mm deep prefabricated cap template installation method according to claim 1 is characterized in that: The binder is hydroxypropyl methylcellulose.

3. The 1200-1800mm deep prefabricated cap template installation method according to claim 1 is characterized in that: The adhesive coating thickness shall not be less than 30 mm.

4. The 1200-1800mm deep prefabricated cap template installation method according to claim 1, characterized in that: When the prefabricated foundation template is installed, the top height of the prefabricated foundation template is controlled by the bottom height of the cushion layer, and the error shall not be greater than 30mm.

5. The 1200-1800 mm deep prefabricated cap template installation method according to claim 1, characterized in that: The spacing between the reinforcing inner supports shall not be greater than 3m.

6. The 1200-1800 mm deep prefabricated cap template installation method 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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