Basement bottom plate post-cast strip construction method

Abstract

The invention discloses a basement bottom plate post-cast strip construction method in the technical field of building construction. The basement bottom plate post-cast strip construction method comprises the following steps that S1, earth excavation is conducted; s2, preparing a concrete cushion layer; s3, building a waterproof layer; s4, binding rebars at the lower part of the post-cast strip; s5, pouring concrete (including small reverse ridges); s6, film covering and curing; s7, post-cast strip supporting; s8, bottom plate pouring (maintenance); s9, post-cast strip cleaning; s10, a post-cast strip is cast (cured); the reverse ridge groove and the water collecting pit are formed in the post-cast strip, so that accumulated water in the post-cast strip is drained in an organized mode, the accumulated water can be drained as soon as possible, reinforcing steel bar protection layers on the two sides of the post-cast strip are guaranteed, and the probability of bottom reinforcing steel bar sinking deviation and common quality problems caused by vibration is reduced; the height difference exists between the concrete reverse ridge groove and the reinforcing steel bars, the workload that cleaning cannot be conducted due to the fact that the bottom reinforcing steel bars are attached to the ground can be reduced, the construction waste storage space is reserved, the waste cleaning procedure can be reduced, the construction speed can be increased, and later construction is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, in particular to a construction method for a post-cast strip of a basement floor. Background Art

[0002] The post-cast joint of the basement floor is a temporary construction joint that is left uncast when pouring concrete on a large scale to prevent cracks caused by hardening and shrinkage. It has the functions of adjusting pressure difference, elevation difference, time difference and reducing temperature shrinkage.

[0003] During the construction process, post-cast joints are often set up. When pouring the post-cast joints, the reserved steel bar pads at the bottom of the post-cast joints are often displaced due to excessive vibration force, making the reserved steel bar protective layer of the post-cast joints unable to meet the design requirements, thus affecting the durability of the structure. The construction waste such as concrete splashed during the vibration process is difficult to clean up due to the sinking of the reserved steel bars, and the water accumulated in the post-cast joints is difficult to drain.

[0004] Based on this, the present invention designs a construction method for a basement floor post-casting strip to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a method for constructing a post-cast strip of a basement floor slab to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A method for constructing a basement floor post-cast strip comprises the following steps:

[0008] S1. Earthwork excavation: excavate a foundation trench in the foundation pit, and excavate a water collection pit in the post-casting zone of the bottom plate of the foundation trench;

[0009] S2, concrete cushion: pour plain concrete foundation cushion at the bottom of the foundation trench and the bottom of the sump;

[0010] S3, building waterproof layer: carry out the construction of membrane waterproof layer and protective layer;

[0011] S4. Tie up the lower reinforcement of the post-cast strip: The lower reinforcement shall be C8@150×150. The lap joints of the reinforcement shall be fastened with wire at the center and both ends of the joint.

[0012] S5. Pouring concrete (including small counter-ridges): Carry out formwork construction of the grooves and use C20 concrete for pouring, and reserve two counter-ridge grooves during pouring.

[0013] S6. Film curing: Manually lay concrete curing film on the poured concrete.

[0014] S7, post-cast strip support: tie the steel bars to the bottom plates on both sides of the post-cast strip;

[0015] S8, bottom plate pouring (curing): pour concrete on the bottom plates on both sides of the post-casting belt, and cover with film for curing;

[0016] S9. Cleaning of post-cast joints: remove debris, cement film, loose sand and gravel on the surface, and weak concrete layer, and roughen the concrete on both sides, rinse with water, and keep the concrete on both sides fully moist.

[0017] S10. Post-casting strip pouring (curing): 45 days after the base plate pouring is completed, the post-casting strip is poured and covered with film for curing for 28 days or more.

[0018] Preferably, the depth of the base trench in step S1 is 150 mm.

[0019] Preferably, the side wall inclination angle of the base groove in step S1 is 45°.

[0020] Preferably, the sump in step S1 has a length of 600 mm, a width of 300 mm, and a height of 700 mm.

[0021] Preferably, the two anti-ridge grooves in step S4 have a width and a height of 100 mm×100 mm and are 700 mm apart.

[0022] Preferably, in step S4, when tying the lower steel bars, steel plate waterstops are respectively embedded between the bottom slab post-cast strip and the basement bottom slabs on both sides.

[0023] Preferably, the thickness of the steel plate waterstop is 3 mm.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention arranges an anti-ridge groove and a water collection pit in the post-casting belt, so that the accumulated water in the post-casting belt can be drained in an organized manner, and the accumulated water can be drained as soon as possible, and the steel protection layer on both sides of the post-casting belt is guaranteed, thereby reducing the probability of sinking and displacement of the bottom steel bars due to vibration and the probability of common quality defects;

[0026] 2. The present invention sets a concrete anti-ridge groove in the post-casting belt, so that there is a height difference between the bottom of the groove and the steel bar, which can reduce the workload of cleaning due to the adhesion of the bottom steel bar to the ground, and reserve a storage space for construction waste, which can reduce the waste cleaning process, speed up the construction speed, and facilitate the later construction;

[0027] 3. The present invention reduces the use of concrete blocks for concrete layer protection, which can save material costs in construction; the use of concrete anti-ridge grooves can reduce the leakage of slurry at the bottom, reduce the workload of workers in removing slurry leakage grooves, and save labor. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0029] Figure 1 It is a schematic diagram of the structure of the present invention;

[0030] Figure 2 This is the construction drawing of the post-cast strip reinforcement and groove of the present invention;

[0031] Figure 3 This is a construction drawing of the post-casting groove of the present invention. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] Embodiment 1

[0034] Please refer to the accompanying drawings, the present invention provides a technical solution:

[0035] A method for constructing a basement floor post-cast strip comprises the following steps:

[0036] S1. Excavation: excavate a foundation trench in the foundation pit, excavate a water collection pit in the bottom plate post-casting strip of the foundation trench, and deepen the local excavation to form a water collection pit, which effectively reduces the amount of excavation and facilitates the drainage of accumulated water into the water collection pit, ensuring the dryness of the bottom plate post-casting strip and the exterior wall post-casting strip, which helps to improve the casting quality of the bottom plate post-casting strip and the exterior wall post-casting strip;

[0037] S2, concrete cushion: pour plain concrete foundation cushion at the bottom of the foundation trench and the bottom of the sump;

[0038] S3, building waterproof layer: carry out the construction of membrane waterproof layer and protective layer;

[0039] S4. Tie the lower reinforcement of the post-casting strip: The lower reinforcement is C8@150×150. The lap joints of the reinforcement should be tied with iron wire at the center and both ends of the joint. Double wires are tied at 30mm from both ends of the lap reinforcement, and one tie is made in the middle. The reinforcement is fully tied.

[0040] S5. Pouring concrete (including small counter-ridges): Carry out formwork construction of the grooves and use C20 concrete for pouring, and reserve two counter-ridge grooves during pouring.

[0041] S6. Film curing: Artificially lay concrete curing film on the poured concrete to make the concrete curing film closely bond with the concrete surface and promote the hydration effect of the concrete. During the concrete curing process, it not only plays a significant role in preventing cracking and moisturizing, but also prevents the evaporation of water vapor in the concrete. The curing time is not less than 14 days.

[0042] S7, post-cast strip support: tie the steel bars to the bottom plates on both sides of the post-cast strip;

[0043] S8, bottom plate pouring (curing): pour concrete on the bottom plates on both sides of the post-casting belt, and cover with film for curing;

[0044] S9. Cleaning of post-cast strips: remove debris, cement film, loose sand and gravel on the surface, and weak concrete layer, and roughen the concrete on both sides, rinse with water, and keep the concrete on both sides fully moist. Due to the existence of the groove of the post-cast strip, there is a 100mm height difference between the bottom plate steel bars and the bottom of the anti-slope drainage ditch, of which 50mm can be used to retain construction waste, thereby reducing the garbage cleaning process.

[0045] S10. Post-casting belt pouring (curing): 45 days after the base plate is poured, the post-casting belt shall be poured and covered with film for curing for 28 days or more. The concrete strength grade of the post-casting belt shall be one level higher than that of the original component, and the anti-permeability grade shall be the same as that of the original component. The temperature of the post-casting belt concrete pouring should be lower than that of the main concrete pouring.

[0046] The sump in step S1 has a length of 600 mm, a width of 300 mm, and a height of 700 mm.

[0047] The two anti-ridge grooves in step S4 have a width and a height of 100 mm×100 mm and are 700 mm apart.

[0048] In this embodiment, the pouring of the post-casting strip should be carried out 45 days after the concrete pouring is completed, and the expansive concrete that meets the design specifications should be used for the cast-in-place concrete; the beam reinforcement shall not be cut off when passing through the post-casting strip, and the slab reinforcement shall retain a reinforcement lap length of 45d when disconnected, and the exposed reinforcement can be protected by cement mortar; the post-casting strip adopts a quick-closing mesh template, and before the post-casting strip is poured, it can be removed only after the strength of the additional concrete reaches the design strength.

[0049] The present invention ensures the steel bar protection layer on both sides of the post-cast strip by arranging anti-ridge grooves and water collection pits in the post-cast strip, reduces the probability of bottom steel bars sinking and shifting due to vibration and the probability of common quality defects, does not cause an increase in construction costs, and allows the accumulated water in the post-cast strip to be drained in an organized manner, so that the accumulated water can be drained as soon as possible, and the cost of drainage can be effectively reduced.

[0050] There is a height difference between the bottom of the concrete counter-ridge groove and the steel bars, which can reduce the workload of cleaning due to the adhesion between the bottom steel bars and the ground; the counter-ridge groove also reserves a 50mm thick storage space for construction waste, which can reduce the garbage cleaning process, speed up the construction speed, and facilitate later construction; therefore, the basement floor post-cast strip construction process of the present invention is free of garbage cleaning and is convenient for promotion and use.

[0051] The present invention can save material costs in construction because it reduces the use of concrete blocks for concrete layer protection; the use of concrete anti-ridge grooves can reduce the situation of bottom slurry leakage, reduce the workload of workers in slurry leakage and groove removal, and save labor.

[0052] Embodiment 2

[0053] The structure of this embodiment is basically the same as that of the first embodiment, except that the depth of the base groove in step S1 is 150 mm and the inclination angle of the side wall is 45°.

[0054] Embodiment 3

[0055] The structure of this embodiment is basically the same as that of the first embodiment, except that, in step S4, when tying the lower steel bars, steel waterstops are pre-embedded between the bottom slab post-cast strip and the basement bottom slabs on both sides, and the thickness of the steel waterstops is 3 mm.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0057] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for constructing a post-cast strip of a basement floor, characterized in that: The following steps are involved: S1. Earthwork excavation: excavate a foundation trench in the foundation pit, and excavate a water collection pit in the post-casting zone of the bottom plate of the foundation trench; S2, concrete cushion: pour plain concrete foundation cushion at the bottom of the foundation trench and the bottom of the sump; S3, building waterproof layer: carry out the construction of membrane waterproof layer and protective layer; S4. Tie up the lower reinforcement of the post-cast strip: The lower reinforcement shall be C8@150×150. The lap joints of the reinforcement shall be fastened with wire at the center and both ends of the joint. S5. Pouring concrete (including small counter-ridges): Carry out formwork construction of the grooves and use C20 concrete for pouring, and reserve two counter-ridge grooves during pouring. S6. Film curing: Manually lay concrete curing film on the poured concrete. S7, post-cast strip support: tie the steel bars to the bottom plates on both sides of the post-cast strip; S8, bottom plate pouring (curing): pour concrete on the bottom plates on both sides of the post-casting belt, and cover with film for curing; S9. Cleaning of post-cast joints: remove debris, cement film, loose sand and gravel on the surface, and weak concrete layer, and roughen the concrete on both sides, rinse with water, and keep the concrete on both sides fully moist. S10. Post-casting strip pouring (curing): 45 days after the base plate pouring is completed, the post-casting strip is poured and covered with film for curing for 28 days or more.

2. The basement floor post-casting strip construction method according to claim 1 is characterized in that: The depth of the base trench in step S1 is 150 mm.

3. The basement floor post-casting strip construction method according to claim 1 is characterized in that: The side wall inclination angle of the base groove in step S1 is 45°.

4. The basement floor post-casting strip construction method according to claim 1 is characterized in that: The sump in step S1 has a length of 600 mm, a width of 300 mm, and a height of 700 mm.

5. The basement floor post-casting strip construction method according to claim 1 is characterized in that: The two anti-ridge grooves in step S4 have a width and a height of 100 mm×100 mm and are 700 mm apart.

6. The basement floor post-casting strip construction method according to claim 1 is characterized by: Step S4: When tying the lower steel bars, pre-embed steel plate waterstop strips between the bottom plate post-cast strip and the basement bottom plates on both sides.

7. The method for constructing a post-cast strip of a basement floor according to claim 6, characterized in that: The thickness of the steel plate waterstop is 3 mm.

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