Construction method for fabricated exterior wall of basement

Abstract

The invention discloses a basement fabricated outer wall construction method. The basement assembly type outer wall construction method comprises the following steps of guide wall construction, bottom plate and guide wall concrete pouring, surveying and setting out, base layer treatment, steel bar correction, wallboard hoisting, temporary fixing, wallboard correction, vertical seam splicing treatment and bottom seam blocking. The problems of spliced seam leakage and installation deviation of the fabricated outer wall are solved, formwork-free construction is achieved, the waterproof performance is improved by 80%, the construction period is shortened by 40%, and the comprehensive cost is saved by 1215 yuan / linear meter.

Description

Technical Field

[0001] The present invention relates to the technical field of traditional Chinese medicine compositions, and particularly to a construction method for an assembled exterior wall of a basement and its application. Background Art

[0002] The traditional exterior wall of the basement is constructed by cast-in-place method, which has problems such as a large amount of formwork support, a lot of wet operations, and a long construction period. Although the existing assembled technology can improve efficiency, it faces two major problems:

[0003] (1) The insufficient sealing of the joints leads to a high risk of leakage;

[0004] (2) It is difficult to control the installation accuracy in a narrow space.

[0005] Therefore, there is an urgent need for an assembled solution that integrates precision control, waterproof reinforcement, and green construction. Summary of the Invention

[0006] In view of the low efficiency of cast-in-place construction and the leakage problem of assembled joints, the present invention provides a construction method for an assembled exterior wall of a basement with optimized whole process, which realizes "zero leakage, high precision, and formwork-free" construction through the collaborative structure of the guide wall - precast wall panel, the double inclined support dynamic correction system, and the joint treatment with modified silane sealant.

[0007] To achieve the above object, the technical solution adopted by the present invention is to provide a construction method for an assembled exterior wall of a basement, including the following steps:

[0008] (a) Guide wall construction: Bind the reserved reinforcement of the guide wall on the bottom slab reinforcement, bind the longitudinal reinforcement outside the reserved reinforcement of the guide wall, and bind the horizontal reinforcement on the longitudinal reinforcement 150 mm from the bottom of the guide wall;

[0009] (b) Pour the concrete of the bottom slab and the guide wall: Pour in layers and vibrate, and control the deviation of the positioning of the guide wall reinforcement;

[0010] (c) Measuring and setting out: Snap the wall body line, the wall end line, and the 200 mm control line on the working layer;

[0011] (d) Base treatment: Chisel the top of the guide wall to a roughness ≥ 4 mm;

[0012] (e) Reinforcement correction: Use special fixtures to correct the spacing, height, and verticality of the inserted reinforcement;

[0013] (f) Wall panel hoisting: Lift the precast cavity wall panel with a special hoisting steel beam, and the horizontal included angle of the sling ≥ 45°;

[0014] (g) Temporary fixation: Set no less than 2 inclined supports, the long support is located at 2 / 3 of the wall height, and the short support is located at 1 / 5 of the wall height;

[0015] (h) Wall panel alignment: Adjust the plane position and verticality through the diagonal brace adjusting rod, and control the verticality deviation ≤ 5 mm;

[0016] (i) Vertical joint treatment: Fill the 15 - 25 mm joint with modified silane sealant and set a PE rod backing material;

[0017] (j) Bottom gap sealing: Use a draw die clamp to seal the 50 mm gap between the wall panel and the guide wall, and paste a 3 mm foam rubber strip on the template contact surface to prevent slurry leakage.

[0018] Furthermore, in step a, plastic washers are set at the outer side of the longitudinal bars for horizontal bar binding, the spacing of the plastic washers ≤ 1 m, the spacing between the inner and outer steel bars ≤ 150 mm, and inclined support fixing bars are embedded in the floor slab.

[0019] Furthermore, in step (g), the bottom of the diagonal brace is fixed by embedded anchor rings or nuts, and the use of post - installed expansion bolts is strictly prohibited.

[0020] Furthermore, in step (i), the width - thickness ratio of the sealant is 2:1 and not less than 1:1 at least, and the base material needs to be cleaned and kept dry before applying the sealant.

[0021] Furthermore, the horizontal bars are S - shaped stirrups, and two Φ10 straight bars are inserted into the cavity at the S - shaped end of the stirrups for binding and fixing.

[0022] Furthermore, the thickness of the precast wall panel is standardized according to "cover thickness + longitudinal bar diameter + horizontal bar diameter + 10 mm", and the maximum size of the coarse aggregate of the post - cast concrete in the cavity ≤ 25 mm, and the slump ≥ 220 mm for 2 hours.

[0023] Furthermore, when hoisting the wall panel, the verticality deviation ≤ 2 mm, the joint width is controlled at 20 ± 5 mm, and the indoor side flatness ≤ 2 mm.

[0024] The beneficial effects of the present invention are:

[0025] In this method, plastic washers are set at 150 mm outside the guide wall steel bars for horizontal bar fixing (spacing ≤ 1 m); after the wall panel is in place, a 50 mm gap is formed between the wall panel and the guide wall, and a draw die clamp is used for reinforcement to prevent formwork bulging. A special steel beam is used for hoisting, and the included angle of the sling ≥ 45°; long and short diagonal braces are set (long braces are set at 2 / 3 of the wall height, and short braces are set at 1 / 5 of the wall height), and the verticality is corrected to ≤ 5 mm through the adjusting rod; modified silane sealant is filled in the 15 - 25 mm vertical joint, and the width - thickness ratio is 2:1; before sealing the 5 cm bottom joint, Φ10 straight bars are inserted to strengthen the cavity connection.

[0026] The waterproof performance is improved, the sealing performance of the interface between the guide wall and the wall panel is increased by 80%, and the seepage rate at the joints is reduced to less than 0.5%; the construction efficiency is optimized, formwork support and plastering are avoided, the construction period is shortened by 40%, and the labor force is reduced by 50%; significant green benefits are achieved, the formwork consumption is reduced by 70%, the construction waste is reduced by 90%, and the carbon emissions are decreased by 35%; cost savings are realized, with a comprehensive cost savings of 1,215 yuan per linear meter. Detailed implementation manners

[0027] To make the objectives, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be described clearly and completely below. Apparently, the described embodiments are some but not all of the embodiments of the present disclosure.

[0028] A construction method for an assembled basement exterior wall includes the following steps:

[0029] (a) Guide wall construction: Tie the reserved steel bars of the guide wall on the bottom slab steel bars, place the horizontal bars of the guide wall inside the longitudinal bars, and tie a horizontal bar 150 mm outside the longitudinal bars to install a plastic washer;

[0030] (b) Pour the bottom slab and guide wall concrete: Pour in layers and vibrate, and control the positioning deviation of the guide wall steel bars;

[0031] (c) Measuring and setting out: Set out the wall body line, wall end line and 200 mm control line on the working layer;

[0032] (d) Base treatment: Chisel the top of the guide wall until the roughness is ≥ 4 mm;

[0033] (e) Steel bar correction: Use special fixtures to correct the spacing, height and verticality of the inserted steel bars;

[0034] (f) Wall panel hoisting: Use a special hoisting steel beam to lift the precast cavity wall panel, and the horizontal included angle of the sling is ≥ 45°;

[0035] (g) Temporary fixation: Set no less than 2 diagonal braces, with the long brace at 2 / 3 of the wall height and the short brace at 1 / 5 of the wall height;

[0036] (h) Wall panel correction: Adjust the plane position and verticality through the diagonal brace adjusting rod, and control the verticality deviation ≤ 5 mm;

[0037] (i) Vertical joint treatment: Fill a modified silane sealant in the 15 - 25 mm joint, and set a PE rod backing material;

[0038] (j) Bottom gap sealing: Use a draw mold fixture to seal the 50 mm gap between the wall panel and the guide wall, and paste a 3 mm foam rubber strip on the template contact surface to prevent slurry leakage.

[0039] In step (a) of this embodiment, the spacing of plastic washers ≤ 1 m, the spacing of the steel bars on the inner and outer sides of the guide wall ≤ 150 mm, and the inclined support fixing steel bars are embedded in the floor slab.

[0040] In step (g) of this embodiment, the bottom of the inclined support is fixed by embedded ground anchor rings or nuts, and the use of post-embedded expansion bolts is strictly prohibited.

[0041] In step (i) of this embodiment, the width-to-thickness ratio of the sealant is 2:1 and the minimum is not less than 1:1. The base material needs to be cleaned and kept dry before applying the sealant.

[0042] In step (j) of this embodiment, S-shaped connecting stirrups need to be tied in the cavity before plugging, and two Φ10 straight bars are inserted and tied in the S-shaped cavity of the stirrups for fixation.

[0043] In this embodiment, the thickness of the precast wall panel is standardized according to "cover thickness + longitudinal bar diameter + horizontal bar diameter + 10 mm", and the maximum particle size of the coarse aggregate of the post-cast concrete in the cavity ≤ 25 mm, and the slump ≥ 220 mm for 2 hours.

[0044] When hoisting the wall panel in this embodiment, the verticality deviation ≤ 2 mm, the joint width is controlled at 20 ± 5 mm, and the indoor flatness ≤ 2 mm.

[0045] Apply the specific scheme of this embodiment. Application example 1: Taiyuan Poly Tianyue Project

[0046] Guide wall construction:

[0047] Tie the steel bars of the guide wall, and install plastic washers (spacing 0.8 m) on the outer horizontal bars;

[0048] Pour C35 concrete, and remove the formwork after the strength of the same-condition test block reaches 20 MPa.

[0049] Wall panel hoisting:

[0050] Select precast wall panels with a thickness = 20 mm (cover) + 16 mm (longitudinal bars) + 12 mm (horizontal bars) + 10 mm = 58 mm;

[0051] The included angle of the sling is 60°. When it is 500 mm from the working surface, adjust the direction, and lower it after aligning the guiding bars.

[0052] Joint treatment:

[0053] Clean the 20-mm joint base layer and insert a Φ12-mm PE rod;

[0054] Inject modified silicone sealant (width 40 mm × thickness 20 mm) and scrape the surface flat.

[0055] Bottom plugging:

[0056] Tie connecting stirrups (HRB400, @150) and insert Φ10 straight bars;

[0057] The die-casting fixture seals the gap, and after the template is pasted with 3-mm foam rubber strips, slightly expanding concrete is poured.

[0058] Application Example 2: Sany Yunhu Project

[0059] The following mix proportion is adopted for the cavity concrete:

[0060] Coarse aggregate: limestone (5 - 25 mm);

[0061] Slump: 240 mm initially and 220 mm after 2 h;

[0062] Restricted expansion rate: reaching 3.0×10 -4 .

[0063] Effect: perpendicularity deviation ≤ 3 mm, and the single-layer construction period is shortened to 5 days.

[0064] By setting the width-to-thickness ratio of the sealant to 2:1, this method improves the deformation adaptability; the restricted expansion rate of the cavity concrete ≥ 2.5×10 -4 It inhibits shrinkage cracks, solves the problems of leakage at the joints of prefabricated exterior walls and installation deviation, realizes formwork-free construction, improves the waterproof performance by 80%, shortens the construction period by 40%, and saves 1,215 yuan per running meter in comprehensive cost.

[0065] The above are only the embodiments of the present invention, and thus do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A construction method for prefabricated exterior walls of a basement, characterized in that , including the following steps: Step a: Guide wall construction: Bind the reserved steel bars for the guide wall on the bottom slab steel bars, bind longitudinal steel bars on the outside of the reserved steel bars for the guide wall, and bind horizontal steel bars on the longitudinal steel bars at the bottom position of the guide wall; Step b: Pour the bottom slab and guide wall concrete: Pour in layers and vibrate, and control the positioning deviation of the reserved steel bars for the guide wall; Step c: Surveying and setting out: Snap the wall body line, wall end line and control line on the working layer; Step d: Base treatment: Chisel the top of the guide wall to a roughness ≥ 4 mm; Step e: Steel bar correction: Correct the spacing, height and perpendicularity of the longitudinal steel bars and horizontal steel bars; Step f: Wall panel hoisting: Lift the precast cavity wall panel, and lower the wall panel smoothly into place by aligning with the reserved steel bars in the cavity area; Step g: Temporary fixation: Set no less than 2 diagonal braces. The long brace is located at 2 / 3 of the wall height, and the short brace is located at 1 / 5 of the wall height; Step h: Wall panel correction: Adjust the plane position and perpendicularity through the diagonal brace adjusting rod, and control the perpendicularity deviation ≤ 5 mm; Step i: Vertical joint treatment: Fill the 15 - 25 mm joint with modified silane sealant, and set a PE rod backing material; Step j: Bottom gap sealing: Seal the gap between the wall panel and the guide wall, and paste a foam rubber strip on the contact surface of the wall panel to prevent slurry leakage.

2. The construction method of the prefabricated basement exterior wall according to claim 1, characterized in that , In step a, plastic washers are set at the binding position of the horizontal steel bars. The spacing of the plastic washers ≤ 1 m, the spacing between the inner and outer steel bars ≤ 150 mm, and inclined support fixing steel bars are embedded in the bottom slab.

3. The construction method of the prefabricated exterior wall of the basement according to claim 2, characterized in that, In step g, the bottom of the diagonal brace is fixed through embedded anchor rings or nuts.

4. The construction method of the prefabricated exterior wall of the basement according to any one of claims 1-3, characterized in that , In step i, the width - thickness ratio of the sealant is 2:1 and not less than 1:1 at least. The substrate needs to be cleaned and kept dry before applying the sealant.

5. The construction method of the prefabricated exterior wall of the basement according to claim 4, characterized in that , Before step j for sealing, S - shaped tie bars are used for the longitudinal steel bars in the cavity, and the ends of the S - shaped tie bars are inserted into the longitudinal steel bars for fixation.

6. The construction method of the prefabricated exterior wall of the basement according to claim 5, characterized in that , The thickness of the precast cavity wall panel is greater than the thickness obtained by adding the protective layer thickness, longitudinal steel bar diameter and horizontal steel bar diameter. And the maximum particle size of the coarse aggregate of the post - cast concrete in the cavity ≤ 25 mm, and the slump ≥ 220 mm for 2 hours.

7. The construction method of the prefabricated basement exterior wall according to claim 6, wherein When hoisting the wall panel, the perpendicularity deviation ≤ 2 mm, the joint width is controlled at 20 ± 5 mm, and the indoor side flatness ≤ 2 mm.