CN116905818A - Cast-in-situ floor slab reserved hole tongue-and-groove type plugging construction method - Google Patents

Abstract

The invention relates to a construction method for post-pouring reserved holes in multi-story or high-rise buildings, specifically a tongue-and-groove sealing construction method for reserved holes in cast-in-place floor slabs. This invention uses a special tongue-and-groove shaped aluminum form to seal the reserved holes in the cast-in-place floor slab, and uses back-top supports to reinforce the formwork. After adding planting bars at the post-cast components, the concrete is poured in two steps, which ensures that It improves the structural safety of the components and greatly reduces the risk of concrete cracking. The tongue-and-groove shaped aluminum mold is mainly composed of a main frame, a handle, a positioning plate and a pressing piece. A tongue-and-groove step plate is set in the vertical middle of the main frame, which can form a tongue-and-groove when pouring concrete, effectively ensuring that the post-poured components are firmly stressed; at the same time, the tongue-and-groove around the hole increases the leakage path and reduces the risk of later leakage. This method is simple to operate, highly practical, has a high turnover rate of the stereotyped aluminum mold device, is technologically environmentally friendly, and can effectively solve the leakage problem of reserved holes in the floor slab.

Description

Construction method of tongue-and-groove sealing of reserved holes in cast-in-place floor slabs

Technical field

The invention relates to a construction method for post-pouring reserved holes in multi-story or high-rise buildings, specifically a tongue-and-groove sealing construction method for reserved holes in cast-in-place floor slabs.

Background technique

With the development of the construction industry and the national economy, more and more people choose commercial housing as their residence. Since most general residences are multi-story or high-rise buildings, in order to meet the transmission requirements of construction control lines, it is necessary to reserve wiring holes in the cast-in-place floor slabs. Due to their excessive height, some high-rise buildings need to use vehicle-mounted pumps for construction operations, which requires additional pump pipe holes in the floor slabs. Since there are many horizontal openings in multi-story or high-rise buildings, there are many post-casting parts, and based on past construction experience, the risk of leakage of post-casting components is extremely high, so the quality control of the plugging of these holes is an important task.

Contents of the invention

Aiming at the problem of extremely high risk of leakage during pouring after reserved holes in multi-story or high-rise buildings, the present invention provides a tongue-and-groove sealing construction method for reserved holes in cast-in-place floor slabs.

The present invention is realized by adopting the following technical solution: a tongue-and-groove sealing construction method for reserved holes in cast-in-place floor slabs, which includes the following steps: making tongue-and-groove shaped aluminum molds → installing wall column board templates → reserving openings → reserving openings Set up reinforcing ribs → Pour the board → Remove the form → Chise the hole → Plant the ribs → Install the template → Pour → Maintain; the tongue-and-groove shaped aluminum mold includes a main frame, a handle, a positioning plate and a pressing piece, and the main frame includes an upward slope The upper frame is surrounded by boards and the lower frame is surrounded by lower inclined plates. A tongue-and-groove platform surrounded by tongue-and-groove step boards is set between the upper frame and the lower frame. The tongue-and-groove shaped aluminum mold adopts a one-time molding process, and the inner corners The triangle piece is welded at the position; a positioning plate is connected to the bottom of the lower frame. There is a pressing plate inside the positioning plate. There are a number of pin holes on the positioning plate. The top plate template around the reserved hole and the tongue-and-groove shaped aluminum mold of the reserved hole are positioned through The pin holes on the board are connected to fix the tongue-and-groove shaped aluminum mold; handles are provided on the two long sides of the main frame.

The above-mentioned tongue-and-groove sealing construction method for reserved holes in cast-in-place floor slabs. The specific steps for reserving the holes are: leave pin holes on the roof formwork around the reserved holes. The positions of the pin holes are consistent with the positioning plates of the tongue-and-groove shaped aluminum molds. The pin holes on the top plate are consistent; after the roof template is verified to be correct, start installing the tongue-and-groove shaped aluminum mold with the reserved hole. During installation, align the pin holes of the positioning plate with the pin holes of the roof template around the hole, and drive in pins for fixation. .

The above-mentioned construction method of tongue-and-groove sealing of reserved holes in cast-in-place floor slabs, the specific process of planting reinforcement is as follows:

(1) Positioning: Mark the location and specifications of drilling holes for planting reinforcement according to design requirements;

(2) Drilling: Use an electric hammer or pneumatic drill to drill holes to the designed diameter and depth;

(3) Hole cleaning: After drilling, blow out the dust in the hole with a blower, and use a brush or cotton cloth to clean the wall hole. Repeat this process many times until there is no dust in the hole;

(4) Adhesive preparation: Put the adhesive in a clean container according to the proportion requirements and mix thoroughly until components A and B are completely mixed;

(5) Rebar planting: drive the prepared rebar planting glue into the hole through a glue gun, discharge the air from the bottom, and then insert the steel bar to the bottom of the hole in a rotating manner; the anchorage length of the rebar planting is 15d according to the benchmark;

(6) Curing: Wait for the colloid to solidify according to the ambient temperature. After complete solidification, load installation can be carried out.

For the above-mentioned construction method of tongue-and-groove sealing of reserved holes in cast-in-place floor slabs, the specific process of formwork installation is as follows: after the reinforcement planting is completed, the formwork is installed. Before installing the formwork, the surroundings of the reserved holes must be cleaned, the side walls must be flushed, and the formwork must be installed. Clean it, apply release agent, and use steel pipes at the bottom of the hole for backing. If the bottom of the hole is too long, multiple vertical poles can be set up as needed to prevent the template from deflecting too much, causing side slurry leakage and affecting the visual quality.

The above-mentioned construction method of tongue-and-groove sealing of reserved holes in cast-in-place floor slabs. The specific pouring process is: before pouring concrete, water the formwork and side walls of the openings to moisten them, and use micro-expanded fine stone concrete that is one grade higher than the original floor slab. Carry out pouring; if the structure does not have special waterproofing requirements, the pouring will be completed in one go; if the structure has special waterproofing requirements, the concrete pouring will be divided into two times. The first pouring height will be 1/2 of the plate thickness. When the surface of the first layer of concrete is After the strength is applied, the penetration crystallization is applied, and then the second pouring is carried out.

The invention has the following technical advantages:

1. Convenient, efficient, and cost-saving: The reserved holes are easy to install and disassemble by using tongue-and-groove shaped aluminum molds, which can greatly improve construction efficiency, and the shaped formwork can be turned over a lot, saving costs.

2. Reliable molding quality: The aluminum alloy template has high stiffness and a flat and smooth surface, which can ensure that the hole is not deformed, has good molding quality and good visual quality.

3. The sealing effect is good and the quality defects are reduced: the reserved hole adopts tongue-and-groove shaped aluminum mold, which can form a tongue and groove around the hole during one pouring, effectively ensuring that the post-poured components are stressed reliably and the structure is firm. The method of back-top support at the bottom of the formwork fundamentally reduces leakage points. Concrete pouring in areas with high waterproofing requirements is changed from one-time molding to layered pouring. Penetrating crystals are painted between the two layers of concrete to form a waterproof layer and improve the self-waterproofing ability of the structure. Using this method, the probability of sealing the reserved holes and leakage is greatly reduced, the visual quality is good, and the secondary repair work is reduced.

4. Economical and reasonable, green and environmentally friendly: This method solves the problem of leakage of post-cast components, reduces labor costs for later repairs and the use of mortar and other building materials, and reflects economy and environmental protection.

Description of the drawings

Figure 1 is a schematic structural diagram of a tongue-and-groove shaped aluminum mold.

Figure 2 is a diagram of the use status of the tongue-and-groove shaped aluminum mold.

In the picture: 1-main frame, 2-handle, 3-tongue and groove step plate, 4-pressing piece, 5-positioning plate, 6-pin hole, 7-upper inclined plate, 8-lower inclined plate, 9-floor.

Detailed ways

This invention uses a special tongue-and-groove shaped aluminum form to seal the reserved holes in the cast-in-place floor slab, and uses back-top supports to reinforce the formwork. After adding planting bars at the post-cast components, the concrete is poured in two steps, which ensures It improves the structural safety of the components and greatly reduces the risk of concrete cracking. The tongue-and-groove shaped aluminum mold is mainly composed of the main frame 1, the handle 2, the positioning plate 5 and the pressing plate 4. A tongue-and-groove step plate 3 is provided in the vertical middle of the main frame 1, which can form a tongue-and-groove when pouring concrete, effectively ensuring that the post-poured components are firmly stressed; at the same time, the tongue-and-groove around the hole increases the leakage path and reduces later leakage. Risk; a handle 2 is provided in the middle of each of the two long sides of the main frame 1, which not only facilitates disassembly, but also avoids blocking the passage of materials through the material transfer port. This method is simple to operate, highly practical, has a high turnover rate of tongue-and-groove shaped aluminum molds, is technologically environmentally friendly, and can effectively solve the leakage problem of reserved holes in floor slabs.

The present invention's tongue-and-groove sealing construction method for reserved holes in cast-in-place floor slabs includes the following steps: making tongue-and-groove shaped aluminum molds → installation of wall column board templates → hole reservation (installation of tongue-and-groove shaped aluminum molds) → reserved holes Set up reinforcing ribs → Pour the slab → Remove the formwork → Chisel the hole → Plant the ribs → Install the formwork → Primary pouring → Apply penetrating crystals → Secondary pouring → Maintenance.

Tongue-and-groove shaped aluminum mold production

The tongue-and-groove shaped aluminum mold is mainly composed of four parts: the main frame 1, the handle 2, the positioning plate 5, and the pressing piece 4. The main frame 1 includes an upper frame surrounded by an upper inclined plate 7 and a lower frame surrounded by a lower inclined plate 8. A tongue-and-groove platform surrounded by a tongue-and-groove step plate 3 is set between the upper frame and the lower frame. A tongue-and-groove shaped aluminum mold is provided. Using a one-time molding process, triangular pieces are welded at the inner corners to enhance the integrity and improve the stiffness of the shaped aluminum mold. The inclined plate set outwards forms a draft angle with the concrete around the reserved opening, which facilitates the demoulding of the finalized formwork, and the main frame 1 set inclined makes the opening of the material transfer hole larger to facilitate the transfer of building materials. The tongue-and-groove step plate 3 on the main frame 1 makes the reserved hole in the roof around the reserved hole formed when concrete is poured for the first time have a tongue and groove, which increases the leakage path and effectively ensures that the post-poured components are firmly stressed. The function of the positioning plate 5 and the pressing plate 4 is to fix the tongue-and-groove shaped aluminum mold by interconnecting with the roof template around the hole and the reserved hole tongue-and-groove shaped aluminum mold. Handles 2 are provided on the upper parts of the two long sides of the main frame 1. When demoulding the tongue-and-groove shaped template, the handles 2 are easily stressed, making it convenient to demould the template.

Template installation

The formwork installation must be carried out in strict accordance with the construction plan. The formwork must be cleaned before installation. During the installation process, pay attention to the number, spacing and tightening degree of the pins. The support system must be erected in accordance with the plan and specification requirements. After the installation is completed, the elevation, verticality, and flatness must be inspected and checked in a timely manner.

Cave entrance reserved

Plan the locations of the material transfer port and pay-out port in advance when drawing the drawings, and reserve horizontal holes when installing the formwork on site. Pin holes are left on the top plate template around the reserved hole, and the positions of these pin holes are consistent with the pin holes on the positioning plate 5 of the tongue-and-groove shaped aluminum mold. After the roof template is verified to be correct, start installing the tongue-and-groove shaped aluminum mold with the reserved hole. During installation, align the pin holes of the positioning plate with the pin holes of the roof template around the hole, and drive in pins for fixation. After the installation of all tongue-and-groove shaped aluminum molds, it is necessary to promptly check whether the templates are firm and reliable.

Set stiffeners

Reinforcement ribs should be set around the hole according to the drawing requirements. Reinforcement ribs can effectively prevent cracking at the corners of the opening. During the background processing of steel bars, pay attention to checking the cutting length of the reinforcement ribs, which must meet the drawing requirements. During the process of tying the steel bars, pay attention to tying the reinforcing bars with the surrounding floor slab steel bars to ensure that they are firmly tied and to avoid the steel bars being disturbed and displaced during the concrete pouring process, resulting in exposed steel bars.

slab pouring

Carry out pouring according to the construction plan. During the pouring process, scaffolding boards must be laid to minimize trampling damage to the steel bars. Disturbed steel bars must be repaired in time. When pouring to the reserved opening, pay special attention to whether the formwork and steel bars are displaced or damaged. Stop pouring in the damaged parts in time, and continue pouring after the repair is completed. During the closing process, pay attention to controlling the thickness and height of the board, making the closing surface smooth and smooth, and covering the surface with film in time to avoid water loss and cracking.

Remove the mold

The formwork can be removed only when the strength of the concrete reaches the specified requirements. During the dismantling process, attention must be paid to the construction intensity, and violent dismantling is strictly prohibited to avoid missing edges and corners of the concrete structure. The formwork for the reserved opening should be removed after other parts have been dismantled, and the side walls should be tapped lightly during the dismantling process to avoid damage.

Chiseling the hole

Before sealing the reserved hole, the surrounding area of the hole should be cleaned and flushed, and the side walls of the hole should be chiseled. A flower hammer should be used for chipping, and the use of electric picks is strictly prohibited. The thickness of the floor is small, and electric picks can easily damage the original structure and the steel bars in the slab. The chiseling should be done until the stone is exposed. After the chiseling is completed, clean it with clean water.

Planting tendons

Plant the steel bars along the extension line of the original floor slab reinforcement. The steel bar type and spacing are the same as the original floor slab reinforcement. The reserved holes can be anchored with glue and reinforcement. The specific operation process is as follows:

(1) Positioning: Mark the location and specifications of drilling holes for planting reinforcement according to design requirements;

(2) Drilling: It is advisable to use an electric hammer or pneumatic drill to drill holes to the designed diameter and depth. If there are steel bars that cannot be cut off, avoid them and adjust the hole position before construction;

(3) Hole cleaning: After drilling, blow out the dust in the hole with a blower, and use a brush or cotton cloth to clean the wall hole. This should be repeated several times until there is no dust in the hole;

(4) Adhesive preparation: Put the adhesive in a clean container and mix it thoroughly according to the proportion requirements until components A and B are completely mixed;

(5) Rebar planting: drive the prepared rebar planting glue into the hole through a glue gun, discharge the air from the bottom, and then insert the steel bar to the bottom of the hole in a rotating manner; the anchoring length of the rebar planting is 15d according to the benchmark;

(6) Curing: Wait for the colloid to solidify according to the ambient temperature. After complete solidification, load installation can be carried out.

Template installation

After the reinforcement is planted, the formwork should be installed. Before installing the formwork, the surroundings of the hole should be cleaned, the side walls should be rinsed, the formwork should be cleaned, and a release agent should be applied. Steel pipes are used at the bottom for backing up. If the side length of the hole is too large (over 300mm), multiple vertical poles can be set up at the bottom for backing up as needed to avoid excessive deflection of the formwork, causing slurry leakage on the sides and affecting the visual quality.

concrete pouring

Before pouring concrete, water the formwork and side walls of the opening to moisten, and use micro-expanded fine stone concrete that is one grade higher than the original floor slab for pouring. If the structure does not have special waterproofing requirements, the pouring will be completed in one go. If the structure has special waterproofing requirements, pour the concrete twice. The first pouring height is 1/2 of the plate thickness (to cover the steel bars). After the surface of the first layer of concrete has strength, apply penetrating crystals, and then pour it twice. pouring.

maintenance

Curing begins 12 hours after the pouring is completed, and the curing time is no less than 7 days. During curing, it can be used as a water test. If leakage occurs, chisel out the poured concrete and pour it again until there is no leakage.

Formwork removal

The formwork can be removed when the concrete strength reaches 75%. Two people must cooperate with each other when removing the formwork. One person removes the vertical pole and the other person removes the formwork to prevent the formwork from falling off and injuring people. The dismantled components should be handled with care and stacked neatly. It is strictly forbidden to throw them around. The removed formwork must be cleaned in time.

Polishing the bottom of the board

After the formwork is removed, check the density and flatness of the bottom of the board. For parts where the formwork is expanded and the roof is uneven, the concrete that exceeds the bottom of the original board will be chiseled and polished to ensure the molding quality of the joints of the roof.

Claims (5)

1. A cast-in-situ floor reserved hole tongue-and-groove type plugging construction method is characterized by comprising the following steps: the method comprises the following steps: manufacturing a tongue-and-groove shaping aluminum die, mounting a wall column plate die plate, reserving a hole to set reinforcing ribs, pouring a plate surface, removing the die, roughening the hole, planting ribs, mounting the die plate, pouring and curing; the tongue-and-groove type shaping aluminum die comprises a main frame (1), a handle (2), a positioning plate (5) and a pressing sheet (4), wherein the main frame (1) comprises an upper frame of an upper sloping plate (7) surrounding a city and a lower frame of a lower sloping plate (8) surrounding the city, a tongue-and-groove platform surrounded by a tongue-and-groove step plate (3) is arranged between the upper frame and the lower frame, the tongue-and-groove type shaping aluminum die adopts a one-step forming process, and triangular plates are welded at the internal corner positions; a positioning plate (5) is connected below the lower frame, a pressing sheet (4) is arranged in the positioning plate (5), a plurality of pin holes (6) are formed in the positioning plate (5), and a reserved hole periphery top plate template and a reserved hole tongue-and-groove type aluminum mould are connected through the pin holes (6) in the positioning plate to fix the tongue-and-groove type aluminum mould; handles (2) are arranged at the upper parts of two long edges of the main frame (1).

2. The cast-in-situ floor slab reserved hole tongue-and-groove plugging construction method according to claim 1, wherein the method comprises the following steps: the specific steps of the hole reservation are as follows: the top plate templates around the reserved holes are provided with pin holes, and the positions of the pin holes are consistent with the pin holes on the positioning plates (5) of the tongue-and-groove shaping aluminum die; and after the top plate template is checked, starting to install the tongue-and-groove type shaping aluminum die with the reserved hole, aligning the pin hole of the positioning plate with the pin hole of the top plate template around the hole during installation, and driving in the pin piece for fixing.

3. The cast-in-situ floor slab reserved hole tongue-and-groove plugging construction method according to claim 2, wherein the method comprises the following steps: the concrete process of planting the bar is as follows:

(1) Marking the positions and specifications of the bar planting holes according to the design requirements;

(2) Drilling, namely drilling the designed diameter and depth by using an electric hammer or an air drill;

(3) Blowing out dust in the hole by using a blower after the hole is drilled, brushing the wall hole by using a hairbrush or cotton cloth, and repeating for a plurality of times until the dust in the hole is free;

(4) The preparation of the adhesive, namely placing the bar planting adhesive into a clean container according to the proportioning requirement, and fully mixing until A, B components are fully and uniformly mixed;

(5) The bar planting step, in which the prepared bar planting glue is beaten into the hole through a glue gun, air is discharged from the bottom, and then the steel bar is inserted into the bottom of the hole in a rotating mode; the anchoring length of the planted bars is 15d according to the standard;

(6) And (3) curing, namely waiting for colloid curing according to the ambient temperature, and carrying out load installation after complete curing.

4. The cast-in-situ floor slab reserved hole tongue-and-groove plugging construction method according to claim 3, wherein the method comprises the following steps: the concrete process of template installation is: after the bar planting is completed, the template is installed, the periphery of a reserved hole is cleaned before the template is installed, the side wall is washed, the template is cleaned up, a release agent is coated, the bottom of the hole is propped back by adopting a steel pipe, a plurality of vertical rods can be arranged at the bottom of the hole with overlarge side length according to requirements, so that the pulp leakage of the side surface is avoided, and the quality of the appearance is influenced.

5. The cast-in-situ floor slab reserved hole tongue-and-groove plugging construction method according to claim 4, wherein the method comprises the following steps: the concrete process of pouring is as follows: watering and wetting the templates and the side walls of the holes before pouring concrete, and pouring the concrete by adopting micro-expansion fine stone concrete with a mark higher than that of the original floor slab; if the structure has no special waterproof requirement, one-time pouring is completed; if the structure has special waterproof requirements, concrete is poured twice, the first pouring height is 1/2 of the thickness of the plate, after the surface of the first layer of concrete has strength, the first layer of concrete is coated with penetrating crystals, and then secondary pouring is carried out.