CN104404985A - Construction method for basement floor post-cast strip waterproofing structure - Google Patents

Abstract

The invention discloses a construction method for a post-cast waterproof structure of a basement bottom plate, which belongs to the technical field of building waterproofing. The steps of the construction method are as follows: bury the drainage main pipe and the drainage branch pipes in the filter tank to the sump of the bottom plate, then fill the filter tank with graded gravel to form a gravel filter layer, and then set mortar on both sides of the lower part of the post-casting belt Stoppers and installation of bottom slab reinforcement; after installing the post-pouring belt side formwork, install mortar blocks on both sides of the upper part of the post-pouring belt; after pouring the bottom slab concrete on both sides of the post-pouring belt, perform post-casting concrete pouring, and maintain under the condition of film insulation and moisture retention Concrete, the curing time is not less than 14 days. The method of the invention can reduce the water pressure of the bottom plate of the basement, realize the waterproof function of the post-cast belt of the bottom plate of the basement, and ensure the quality of concrete pouring.

Description

Construction method of post-cast waterproof structure of basement floor

technical field

The invention belongs to the technical field of building waterproofing, and in particular relates to a construction method for a post-cast waterproof structure of a basement bottom plate.

Background technique

In the construction of large-scale basement structures, it is necessary to set up post-casting belts to solve the problems of poor settlement and reduce shrinkage stress. The structural design and construction technology of post-casting belts will affect the construction quality of the entire basement structure, and even affect the normal use function. At present, the waterproof construction of the basement bottom slab post-casting belt mainly adopts the construction method of plugging, and the structural measures of pre-embedding steel plate waterstops in the bottom slab and setting a waterproof layer at the bottom of the slab, but there are still different degrees of seepage in the basement bottom slab post-casting belt. leakage situation.

Contents of the invention

The object of the present invention is to provide a construction method for the waterproof structure of the post-cast belt of the basement floor aiming at the technical problems existing in the existing construction method of the post-cast belt of the basement floor.

The concrete steps of the construction method of a basement basement post-cast waterproof structure provided by the present invention are as follows:

(1) After the construction of the foundation cushion 6 is completed, the drainage main pipe 5 and the drainage branch pipe 7 are buried in the water filter tank to the bottom sump. Stone water filter layer 4, and then on the crushed stone water filter layer 4, a plastic film isolation layer 9 is laid along the post-casting belt 2 direction.

(2) Before installing the steel bars on the lower floor of the basement, set mortar stoppers 8 on the lower parts of both sides of the post-cast belt 2, and place the steel bars in the grooves of the mortar stoppers 8 to prevent concrete from flowing into the post-cast belt during the pouring process of the basement floor 1 2, and then install other bottom plate reinforcement.

(3) Install the post-cast belt side formwork, and the post-cast belt side form 3 is supported by a dense mesh steel wire mesh and a steel skeleton, and the dense mesh steel mesh is placed on the concrete side of the basement floor 1 and tied firmly with tie wires; the steel skeleton and the bottom floor The upper layer of steel bars and the lower layer of the bottom plate are welded and fixed, and a mortar stopper 8 is installed at the upper position of the upper layer of reinforcement mesh.

(4) Concrete on both sides of the post-poured belt shall be poured and compacted according to the construction specifications of the bottom-slab concrete, and the loose concrete on both sides of the post-poured belt shall be cleaned and rinsed in time.

(5) After the concrete shrinkage of the basement floor and the settlement of the building are basically stable and reach the design requirements, the post-pouring concrete is poured, and the sundries in the post-pouring 2 are cleaned before pouring and the mortar block located on the upper part of the post-pouring 2 is removed. block, check and adjust the steel bars, water and moisten them, use concrete mixed with micro-expansion agent to pour and then pour the belt, fully vibrate and compact, and use the film to maintain the concrete under the condition of heat preservation and moisture retention, and the curing time is not less than 14 days.

The present invention has the following technical characteristics:

1. The post-pouring belt has a simple structure, which is convenient for construction operation and quality control;

2. Reduce the water pressure of the basement floor and realize the waterproof function of the post-cast belt of the basement floor;

3. There is no accumulated water in the post-pouring zone, and the quality of concrete pouring is guaranteed;

4. The reinforced concrete reinforced structure at the bottom of the post-pouring belt is replaced by the gravel water filter layer, and the waterproof layer of the coiled material and the steel plate waterstop are canceled, which saves costs and speeds up the construction progress.

Description of drawings

Fig. 1 is a schematic diagram of the post-pouring tape waterproof structure after the construction of the method of the present invention.

In the figure: 1: Basement floor; 2: Post-pouring belt; 3: Post-pouring belt side form; 4: Gravel water filter layer; 5: Drainage main; 6: Foundation cushion; 7: Drainage branch pipe; 8: Mortar retaining Block; 9: plastic film isolation layer.

Detailed ways

The construction steps of the post-cast waterproof structure of the basement floor provided by the present invention are as follows:

1. After the construction of the foundation cushion 6 is completed, the drainage main pipe 5 and the drainage branch pipe 7 are buried in the filter tank to the bottom sump. The upper part of the drainage main pipe 5 is provided with a φ8-10mm drainage hole. The lower part of the post-pouring belt is covered with graded gravel to form a gravel filter layer 4, and the gradation of the gravel should be 10-31.5; finally, a layer 1.5m wide and 1.5m thick is laid on the gravel filter layer along the direction of the post-casting zone 2 0.5mm plastic film isolation layer9.

2. Before the reinforcement of the base plate is bound, place mortar stoppers 8 at the lower part of the post-pouring belts on both sides, and place the lower steel bars of the bottom reinforcement mesh in the grooves of the mortar stoppers 8 to prevent the concrete from flowing into the post-pouring during the pouring process of the basement floor 1. Inside the belt 2, install other bottom plate steel bars.

3. The post-cast side form 3 is supported by a dense mesh steel wire mesh and a steel skeleton. The dense mesh steel mesh is placed on the concrete side of the basement floor 1 and tied firmly with tie wires. The steel skeleton is welded to the upper and lower floors of the bottom floor. Mortar stopper 8 is installed at the upper position of the post-cast belt of the upper layer of steel mesh.

4. According to the floor concrete construction plan and specification requirements, pour the concrete of the basement floor 1 on both sides of the post-pouring belt 2 and vibrate it compactly. Clean up the loose concrete on both sides of the post-pouring belt 2 and rinse it.

5. After the concrete shrinkage of the basement floor 1 and the settlement of the building are basically stable, and the time required by the design is reached, the concrete pouring of the post-pouring belt 2 can be carried out; Mortar stopper 8, watering, rinsing and wetting, and checking and adjustment of steel bars; pouring belt 2 after pouring concrete mixed with micro-expansion agent, fully vibrating and compacting; curing concrete under the condition of thermal insulation and moisture retention with film, the curing time is not Less than 14 days.

Claims (3)

1. a construction method for basement bottom plate rear pouring tape waterproof construction, is characterized in that these construction method concrete steps are as follows:

(1) after foundation pad has been constructed, drain header and branch drain is buried underground to base plate sump in drainage trap, be paved with graded broken stone in drainage trap after installation below ater-casting and form rubble drainage layer, then on rubble drainage layer, lay plastic sheeting separation layer along direction, ater-casting;

(2) before base plate lower floor reinforcement installation, in ater-casting two, side lower part arranges mortar block, is placed on by reinforcing bar in the groove of described mortar block, prevents concrete in basement bottom board casting process from flowing in ater-casting, then installs other baseplate reinforcing bar;

(3) install ater-casting side form, ater-casting side form adopts dense mesh and cage of reinforcement to install, and dense mesh is placed on the concrete side of basement bottom board, and firm with tied silk colligation; Cage of reinforcement and base plate top reinforcement and base plate lower floor reinforcement welding are fixed, and install mortar block at top reinforcement mesh sheet ater-casting upper position;

(4) build both sides, ater-casting underplate concrete, build both sides, ater-casting concrete and vibration compacting by the requirement of underplate concrete job specfication, clear up the loose concrete in both sides, ater-casting in time and rinse well;

(5) until basement bottom board concrete shrinkage and building settlement basicly stable and carry out ater-casting concreting after reaching the designing requirement time, foreign material before building in cleaning ater-casting and dismounting are positioned at the mortar block of ater-casting upper position, inspection adjustment is carried out to reinforcing bar, water water-wet, adopt the concreting ater-casting of admixture micro-expanding agent, abundant vibration compacting, take curing concrete under band film heat and moisture preserving condition, curing time is no less than 14 days.

2. the construction method of a kind of basement bottom plate rear pouring tape waterproof construction according to claim 1, is characterized in that the macadam gradating of described rubble drainage layer is 10-31.5mm.

3. a kind of basement bottom plate rear pouring tape waterproof construction according to claim 2, is characterized in that the first half of described drain header is provided with the drain hole of some φ 8-10mm.