A prefabricated formwork buttress structure construction method for basements and long strip foundations

Abstract

A method for constructing a prefabricated formwork buttress structure for basements and long strip foundations is characterized by comprising the following steps: a) cleaning the base cushion layer, b) excavating earthwork, c) trial placement and cutting of prefabricated formwork, d) assembling the panels, e) reviewing and correcting the panels, f) reinforcing the joints, g) repairing and reinforcing the corner bases, h) reinforcing the internal supports, i) backfilling the earthwork, j) pouring the base cushion layer around the base, k) removing the internal supports, and l) subsequent construction steps. The method for constructing a prefabricated formwork buttress structure for basements and long strip foundations of the present invention has the advantages of increasing the self-sustaining nature of the formwork, effectively ensuring formwork rigidity, preventing deformation and displacement of the formwork during the backfilling phase, ensuring the quality of the base cushion formwork construction, reducing the number of steps, saving construction time, and reducing waste disposal.

Description

TECHNICAL FIELD

[0001] The present application relates to a prefabricated formwork construction method, in particular to a prefabricated formwork supporting wall structure construction method for basement and long strip foundation. BACKGROUND

[0002] Early in the basement floor perimeter area or long strip pile cap area, the conventional brick formwork or wood formwork reinforcement method has some shortcomings. The wood formwork needs to be removed and waterproofed after backfilling, which is a multi-process, late backfilling, and if it is in the rainy season, the steel bar is easily polluted by mud after rainwater washing. The brick formwork needs to be plastered, which is a multi-process, high cost, large labor input, and many objective factors affect the project, which is difficult to control the construction period and cost. In order to improve the construction efficiency of the pile cap formwork, the prefabricated plate is used as the pile cap prefabricated formwork for the basement floor side wall and other parts, but the long strip foundation side formwork construction is prone to length, poor self-standing during construction and backfilling.

[0003] The prefabricated plate is generally a fine aggregate cement hollow prefabricated plate formwork, which is uniformly mixed with fly ash, cement, and construction slag, and is formed under the uniform extrusion of the production machine. It has good integrity and is a green building material for building slag recycling.

[0004] The commonly used brick formwork plate has a thickness of 90mm, a width of 600mm, and a length of 2000mm-3200mm, which can be produced in a fixed length according to the size of the pile cap on site. Now many projects use new prefabricated formworks, but for long strip foundation, the prefabricated formwork construction is prone to poor self-standing.

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

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

[0007] To achieve the above-mentioned purpose, the technical solution of the present application is:

[0008] A prefabricated formwork supporting wall structure construction method for basement and long strip foundation, characterized in that it comprises the following steps:

[0009] a. Pile cap bottom cushion layer cleaning

[0010] The cushion layer of the prefabricated formwork pile cap to be installed must be thoroughly cleaned, and the surface of the cushion concrete structure contacted by the prefabricated formwork as a wall plate must be flat and dense.

[0011] b. Earth excavation

[0012] The earthwork excavation stage provides technical guidance to the earthwork construction unit, and super-digging and random digging are strictly prohibited;

[0013] c. Try to swing the sample, cut and cut the prefabricated template

[0014] According to the length of the basement floor side mold, the length and height of the pile cap, combined with the width of the wallboard, the prefabricated template is cut and cut, the size of the joint part is measured in advance;

[0015] d. Sit in the plate

[0016] When installing the prefabricated template, coat the top end and side edge of the prefabricated template with adhesive, and the coating should be uniform, without hanging. When the prefabricated template is used as a wallboard, use a crowbar to squeeze it into place. Use a laser three-wire instrument to correct the perpendicularity and flatness of the adjacent plate surface in time to ensure that the joint is tight and straight.

[0017] e. Review and correct

[0018] For prefabricated template plate operations in areas with large cushion elevation errors, use wooden wedges to tighten the bottom of the prefabricated template. Scrape the adhesive squeezed out of the gap. After the prefabricated template is initially positioned as a wallboard, use a square and a line support plate to level and vertically align the wall surface.

[0019] f. Joint reinforcement

[0020] After the prefabricated template is installed, use adhesive to fill the joint and cover the mesh tape to improve the integrity of the joint. For prefabricated template inside and outside corner parts, perform secondary grouting repair and reinforcement treatment to ensure that the inside and outside corners are square and improve the overall integrity of the pile cap mold.

[0021] g. Corner base repair and reinforcement

[0022] Perform quality self-inspection on the bottom part of the prefabricated template. After the plate work is completed, clean the bottom landing ash, perform secondary grouting repair on the 50mm joint between the cushion bottom and the 50mm vertical surface of the plate, and clean the surface of the cushion.

[0023] h. Internal support reinforcement

[0024] After the prefabricated template model is completed, review the prefabricated template plate top elevation, pile cap mold internal size, inside and outside corner squareness, plate joint flatness and plate perpendicularity key data. After passing the acceptance, timely use steel pipes and wooden bars for internal support reinforcement to increase the support of the joint.

[0025] i. Earth backfilling

[0026] After the installation of the prefabricated slab bearing platform mold is completed, the bearing platform mold is avoided as a force fulcrum, direct force extrusion, and the collision of the earth moving hopper on the formed prefabricated slab bearing platform mold is avoided, and the prefabricated slab bearing platform mold is slowly slid into the edge of the slope, and the surrounding is backfilled at the same time, and artificial leveling is matched;

[0027] j、Pile up the bottom plate cushion layer of the bearing platform

[0028] After the earthwork backfilling is completed, the bottom plate cushion layer concrete is poured according to the design elevation, and the overall coverage of the bottom plate cushion layer concrete on the bearing platform prefabricated mold is ensured, so that the effective connection integrity of the cushion layer and the bearing platform prefabricated mold is improved;

[0029] k、Remove the inner support frame

[0030] The inner support removal should be completed after the installation of the prefabricated mold bearing platform mold and the earthwork backfilling and the bottom plate cushion layer solidification.

[0031] l、Construction of the subsequent process

[0032] Start waterproofing and subsequent process construction.

[0033] The prefabricated mold supporting wall structure construction method for the basement and long strip foundation of the application can also adopt the following technical measures to further realize.

[0034] The aforementioned method, wherein the binder is hydroxypropyl methylcellulose.

[0035] The aforementioned method, wherein the binder coating thickness is not less than 30mm.

[0036] The aforementioned method, wherein when the prefabricated mold bearing platform mold is installed, the top height of the prefabricated mold is controlled by the bottom height of the cushion layer, and the error should not be greater than 30mm.

[0037] The aforementioned method, wherein the inner support reinforcement spacing should not be greater than 3m.

[0038] The aforementioned method, wherein the support at the joint uses a wooden square or a steel pipe diagonal brace.

[0039] After adopting the above technical scheme, the prefabricated mold supporting wall structure construction method for the basement and long strip foundation of the application has the following advantages:

[0040] 1. By using whole plate assembly along the length direction, and installing a supporting wall plate with a width of 250mm perpendicular to the length direction of the prefabricated mold, the self-standing property of the mold is improved, the rigidity of the mold is effectively ensured, and the deformation and displacement of the mold during the earthwork backfilling stage is avoided.

[0041] 2. The construction quality of the bearing platform mold is ensured, the process is reduced, and the construction period is effectively saved.

[0042] 3. The prefabricated template production stage uses construction slag and other materials, effectively saving energy and reducing waste. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 A prefabricated template structure schematic diagram of the embodiment of the present application;

[0044] Figure 2 A bottom plate side mold and long strip-shaped bearing platform prefabricated template structure plan view of the embodiment of the present application;

[0045] Figure 3 A Figure 2 A sectional view of 1-1;

[0046] Figure 4 A prefabricated template supporting wall structure for the basement and long strip foundation of the embodiment of the present application. DETAILED DESCRIPTION

[0047] The present application will be further described below in conjunction with the embodiments and their accompanying drawings.

[0048] Embodiment 1

[0049] The application range of the prefabricated template supporting wall structure construction method for the basement and long strip foundation of the present application: the prefabricated template installation and reinforcement method is suitable for the prefabricated template of the basement bottom plate side mold or long strip-shaped bearing platform, has better integrity and self-standing property, is used for the basement bottom plate and other areas, and has simple process, which can reduce multiple processes such as template support setting.

[0050] The construction principle of the prefabricated template supporting wall structure construction method for the basement and long strip foundation of the present application: the prefabricated template of the basement bottom plate side mold or long strip-shaped bearing platform, because the prefabricated template has a long assembly length, if no stable measures are arranged in the middle, deformation and displacement are prone to occur in the earthwork backfilling stage, and the self-standing property of the template cannot be guaranteed, the prefabricated bearing platform template plate has a width of 600 mm and a length of 2000 mm, can be customized according to the project size, and the maximum length is 3200, the construction method is to install the whole plate in the length direction, increase the protruding plate 250 in the vertical length direction, and the supporting wall structure measures are equal in height to the long direction, which increases the rigidity and stability in the length direction of the bottom plate side mold and long strip-shaped bearing platform.

[0051] Material requirements of the prefabricated template supporting wall structure construction method for the basement and long strip foundation of the present application:

[0052] 1) Template: 90 mm thick prefabricated bearing platform template;

[0053] 2) Adhesive: adhesive: hydroxypropyl methyl cellulose, bonding strength 14.8 million Mpa.

[0054] 3) Wood: 40mm*90mm square wood (internal support);

[0055] 4) Steel pipe: standard Φ48*3.6mm galvanized steel pipe (internal support).

[0056] The process flow of the prefabricated formwork supporting wall structure construction method for the basement and long strip foundation of the application is as follows: the bottom pad layer of the bearing platform is cleaned, the positioning and calibration are measured, the mechanical earthwork is excavated to 300mm above the bottom of the bearing platform, the artificial soil is leveled, the concrete pad layer is poured, the prefabricated bearing platform mold line is placed, the sample is tried, the plate cutting and blanking are carried out, the slurry is placed, the plate is spliced and integrated, the end supporting plate is placed, the continuous process construction is completed, the internal support is reinforced, the bearing platform and the ground beam side backfilling is carried out, the internal support frame is removed, the site is leveled, and the foundation pad layer is leveled.

[0057] Please refer to Figures 1-4 The prefabricated formwork supporting wall structure construction method for the basement and long strip foundation of the application comprises the following steps:

[0058] 1. Cleaning the bottom pad layer of the bearing platform

[0059] The pad layer of the prefabricated bearing platform mold to be installed must be thoroughly cleaned, the pad layer concrete structure surface contacted by the wall plate must be flat and dense, and the strength must meet the working conditions. At the same time, there should be no obvious accumulated water in the working area, and work should be avoided in rainy days.

[0060] 2. Earthwork excavation

[0061] During the earthwork excavation stage, a full-time surveyor should be assigned to provide technical guidance on the earthwork unit, and over-excavation and random excavation should be strictly prohibited.

[0062] 3. Trial sample, plate cutting and blanking

[0063] According to the length of the basement bottom plate side mold, the length and height of the bearing platform, and the width of the wall plate (standard plate width 600mm), the plate cutting and blanking are carried out, the size of the joint plate part should be measured in advance to avoid material waste.

[0064] 4. Slurry placement and plate splicing

[0065] When the plate is installed, the top end and the side edge should be fully coated with adhesive (adhesive name: hydroxypropyl methyl cellulose; adhesive strength: 14.8 million Mpa, detailed product inspection report attached), the coating should be uniform, and the adhesive coating thickness should not be less than 30mm. When the wall plate is erected, a crowbar is used to squeeze it into place, and a laser three-wire instrument is used to correct the perpendicularity and flatness of the adjacent plate surface in time to ensure that the joint is tight and straight.

[0066] 5. Review and correction

[0067] For paneling operations in areas with large errors in the cushion layer elevation, wooden wedges should be used to tighten the bottom of the board in time, and the adhesive squeezed out of the gaps should be scraped and filled in time.

[0068] After the wall panels are initially in place, the wall surface should be leveled and plumb using a protractor and line support board.

[0069] 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.

[0070] 6. Joint reinforcement

[0071] After the panels are installed, the joints should be promptly patched with adhesive and covered with grid tape to improve the integrity of the joints. For internal and external corners, secondary patching and reinforcement should be carried out to ensure that the angles are square and improve the integrity of the foundation formwork.

[0072] 7. Repair and reinforcement of corner base

[0073] 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 panel should be repaired for the second time. After the operation is completed, the surface of the cushion layer should be cleaned in time to prepare for subsequent operations in advance.

[0074] 8. Internal support reinforcement

[0075] After the installation of the model is completed, key data such as the plate top elevation, the internal size of the pedestal mold, the squareness of the corners, the flatness of the plate joints and the verticality of the plates are reviewed. After acceptance, steel pipes and wooden planks are used for internal reinforcement in a timely manner. The spacing between the reinforced internal supports shall not be greater than 3m. Appropriate support should be added at the joints. The support at the joints should 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).

[0076] 9. Backfill

[0077] 8 hours after the installation of the prefabricated slab cap formwork is completed (at this time, the adhesive strength reaches the maximum 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. It is also necessary to avoid the collision of the soil hopper with the formed prefabricated slab cap formwork. Slowly slide down 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 allowed to operate on it to reduce the extrusion damage to the cap formwork:

[0078] 10. Casting of the outer bottom plate cushion layer of the pedestal

[0079] After the earthwork backfilling is completed, the bottom plate cushion concrete is poured according to the design elevation, and the overall coverage of the bottom plate cushion concrete to the pile cap mold is ensured, so as to improve the effective connection integrity of the cushion and the pile cap mold.

[0080] 11. Inner support frame body dismantling

[0081] The inner support dismantling should be carried out after the precast slab pile cap mold installation is completed for 8 hours (at this time, the adhesive strength reaches the maximum value to meet the requirements) and the earthwork backfilling is completed and the bottom plate cushion solidifies.

[0082] 12. Subsequent process construction

[0083] The waterproofing and subsequent process construction are started.

[0084] The application has substantial features and significant technical progress. The support wall type structure construction method for the basement bottom plate side mold and long strip foundation precast mold of the application is more convenient to construct compared with the traditional method. For the support wall type structure construction method of the long strip foundation pile cap precast mold, the precast mold arrangement is carried out: after the foundation cushion is poured, the whole plate length size of 2000-3200 mm is selected according to the length of the bottom plate side mold and the size of the long strip pile cap, and the support wall plate is cut; the whole plate is installed on the top of the slurry, the support wall plate is installed by pasting adhesive on the end of the plate, and the whole plate is bonded by brushing adhesive. Through the splicing of the vertical end wall and the long side direction as the support wall structure in the precast mold construction stage, the self-standing property and the integrity of the precast mold construction are effectively ensured, the number of processes is less, the construction period is saved, and the economic characteristics are better.

[0085] The precast mold support wall structure construction method for the basement and long strip foundation of the application is used in the Guangzhou Exhibition Center project, and the effect is remarkable. It is used in the basement bottom plate side mold area and long strip pile cap, and the construction is simple and convenient, the process is less, the cost is more economical, the whole plate is spliced in the length direction, the support wall plate structure is increased perpendicular to the length direction, the strength, stiffness and stability of the precast mold installation are effectively ensured, the visual quality is good, the application range is wide, the use is easy to grasp, easy to popularize and use, and it is unanimously recognized by the supervision unit and the construction unit, and is welcomed by the operating personnel, and good economic benefits and social influence are obtained.

[0086] The above examples are only for illustrating the application, and are not limited to the application. Those skilled in the art can make various transformations or changes without departing from the spirit and scope of the application. Therefore, all equivalent technical solutions should belong to the scope of the application, which should be defined by the claims.

Claims

1. A construction method for prefabricated formwork buttress structure for basement and 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 concrete surface of the cushion where the prefabricated formwork is in contact with the wall panels must be flat and compact. b. Earth 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 basement floor side formwork, the length and height of the pedestal, and the width of the wall panels, the prefabricated templates are cut and blanked. The dimensions of the parts that need to be connected should be measured in advance; d. Sit-on board When installing the prefabricated formwork, apply adhesive to the top and side edges of the prefabricated formwork. The adhesive should be applied evenly without dripping. 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 flatness of adjacent panels to ensure that the joints are tight and straight. e. Review and Correction For prefabricated formwork paneling work at locations with cushion elevation errors, use wooden wedges to tighten the bottom of the prefabricated formwork panels, scrape off the adhesive squeezed out of the gaps, and after the prefabricated formwork is initially in place as a wall panel, use a square and a line support board to level and plumb the wall surface. f. Joint reinforcement After the prefabricated formwork is installed, the joints are patched 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 patching and reinforcement are performed to ensure that the inner and outer corners are square and improve the integrity of the foundation formwork. g. Repair and reinforcement of corner base Strengthen the quality self-inspection of the bottom of the prefabricated formwork. After the paneling work is completed, clean the dust on the bottom, repair the joint 50mm below the cushion layer and 50mm above the plate surface with secondary grouting, and clean the cushion layer surface. h. Internal support reinforcement After the prefabricated formwork model is completed, the key data of the prefabricated formwork top elevation, the internal space size of the pedestal formwork, the squareness of the inner and outer corners, the flatness of the plate joints and the verticality of the plate are reviewed. After acceptance, steel pipes and wooden squares are used for internal reinforcement in a timely manner 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, and avoid the soil hopper from colliding with the precast slab cap formwork. Slowly slide down 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 plate cushion layer of the pedestal After the backfill is completed, pour the bottom slab cushion concrete according to the design elevation to ensure that the bottom slab cushion concrete covers the entire precast formwork of the pedestal to improve the effective connection integrity between the cushion and the precast formwork of the pedestal; k. Dismantling of the internal 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 subsequent processes Start waterproofing and subsequent construction work.

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

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

4. The construction method of prefabricated formwork buttress structure for basement and 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 supports and 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 joint is made of wooden squares or steel pipe diagonal braces.

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