Underground engineering bottom plate post-cast strip water stop structure and construction method

Abstract

The invention relates to the field of building construction, discloses an underground engineering bottom plate post-cast strip water stop structure and a construction method, and aims to solve the problem that a conventional advanced water stop post-cast strip leaks due to the fact that advanced concrete is constructed for several times and an advanced plate and a structural bottom plate are constructed in sequence to form a construction joint. Comprising the steps that firstly, a bottom plate waterproof layer is constructed to provide a waterproof base for a follow-up structure, and then an advanced reinforced concrete plate with a groove is integrally poured; then soil blocks are matched with formworks to support and pour structural concrete on the two sides of the post-pouring belt, water is injected to soften the soil blocks into slurry, and the formworks are removed after cleaning; and after the post-cast strip is cleaned, a water stop belt is installed, a gap is caulked and blocked, and finally post-cast strip concrete is poured and cured. According to the method, advance plate construction joints are eliminated, the hidden danger of leakage is solved, soil block supports are easy to clean, formwork dismantling is simplified, construction quality and efficiency are guaranteed, and underground engineering bottom plate water stopping reliability is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building construction, in particular to a waterproof structure of a post-poured band of a bottom plate of underground works and a construction method. BACKGROUND

[0002] With the development of the construction industry, super-long, super-deep basements and high-rise main buildings and low-rise podium buildings are increasingly linked to underground structures. Such structures are susceptible to settlement deformation and stress concentration due to geological differences, uneven loads, and concrete shrinkage, which can lead to cracking of the bottom plate. The setting of post-poured bands during the construction of the bottom plate has become a core technical means to ensure the safety of underground structures by releasing stress and coordinating settlement through sequential pouring.

[0003] The conventional method uses an advanced waterproof post-poured band, with a concrete slab constructed in advance within the width of the post-poured band. The concrete slab is constructed in two stages, with a construction joint using a rubber waterproof band. The pre-embedded rubber waterproof band in the advanced concrete slab is constructed first, with half buried in the concrete and half left in the other half of the concrete. The construction joint is perpendicular to the twice-poured concrete. After the construction of the advanced concrete slab, the structure concrete bottom plate is normally constructed, and finally the post-poured band concrete is poured.

[0004] In this method, the advanced concrete is constructed in two stages, which can cause cracks in the construction joint due to uneven settlement. In addition, the advanced waterproof concrete and the structure concrete bottom plate are also constructed in two stages, which also have a construction joint and may cause leakage. SUMMARY

[0005] To overcome the above problems, the present application provides a waterproof structure of a post-poured band of a bottom plate of underground works and a construction method, which aims to improve the problem of leakage caused by the construction joint between the advanced concrete and the structure concrete bottom plate.

[0006] To achieve the above purpose, the present application adopts the following technical solution: a waterproof structure of a post-poured band of a bottom plate of underground works and a construction method, characterized by the following steps:

[0007] S1: First, complete the construction of the bottom plate waterproof layer to provide a waterproof base for the subsequent concrete structure and ensure that groundwater does not penetrate from the bottom layer of the bottom plate;

[0008] S2: Pour the advanced reinforced concrete slab on the top of the bottom plate waterproof layer, and the upper part of the advanced reinforced concrete slab is provided with a groove along the length direction of the post-poured band;

[0009] S3: after the concrete strength of the advanced reinforced concrete slab reaches the design strength requirement, laying soil block one on one side of the advanced reinforced concrete slab corresponding to the post-pouring belt, and installing formwork one above the soil block one to form a support system, and then pouring the bottom plate concrete layer one;

[0010] S4: after the strength of the bottom plate concrete layer one reaches the design strength requirement, soaking the area where the soil block one is located with water to make the soil block one soften and turn into mud, cleaning and draining the mud and accumulated water through the water collecting pit pre-opened on the advanced reinforced concrete slab, and then removing the formwork one;

[0011] S5: referring to the construction process and standard of steps S3-S4, laying soil block two on the other side of the post-pouring belt, installing formwork two, pouring the concrete layer two, and repeating the water soaking, mud cleaning and formwork two removal operations after the strength of the concrete layer two reaches the standard;

[0012] S6: thoroughly cleaning the slot formwork residues, dust and other sundries in the post-pouring belt, and placing the rubber waterstop into the space formed by the recess of the advanced reinforced concrete slab and the bottom plate concrete layer one and the concrete layer two, and the rubber waterstop fills the space;

[0013] S7: pouring the concrete of the post-pouring belt, curing to the design strength, and completing the waterstop construction of the post-pouring belt of the underground engineering bottom plate.

[0014] Preferably, the width of the upper end recess of the advanced reinforced concrete slab is greater than the width of the post-pouring belt.

[0015] Preferably, after the construction of the rubber waterstop is completed, bitumen is used to caulk and seal the gap between the rubber waterstop and the surrounding concrete.

[0016] Preferably, the rubber waterstop is a water-swelling rubber waterstop.

[0017] Preferably, the water-swelling ratio of the rubber waterstop is 200%-500%, and the thickness of the waterstop is matched with the depth of the recess of the advanced reinforced concrete slab.

[0018] Preferably, the laying range of the soil block one and the soil block two completely covers the support area below the formwork one and the formwork two.

[0019] Preferably, the formwork one and the formwork two use bamboo plywood or aluminum alloy formwork, and the formwork is closely attached to the top surface of the advanced reinforced concrete slab when installed, and the joint is sealed with waterproof tape.

[0020] Preferably, the bottom plate waterproof layer includes, from bottom to top, a concrete cushion layer, a waterproof coating layer, a waterproof roll material layer and a waterproof protection layer, to prevent water seepage at the bottom.

[0021] Preferably, the water injection soaking time is not less than 24 hours, and the mud is cleaned by using a high-pressure water gun combined with a water collecting pit to ensure that there is no mud residue under the first formwork and the second formwork.

[0022] Preferably, after the post-cast concrete is poured, a maintenance method combining a plastic film and a fire-retardant cotton quilt is used, and the temperature difference between the concrete surface and the environment during the maintenance period is not more than 25 DEG C.

[0023] The present application has the following beneficial effects:

[0024] 1. In the present application, the construction joint caused by the construction of the advanced concrete in sections in the conventional scheme is eliminated from the root by the design of the whole pouring of the advanced water stop concrete slab, and the construction joint cracking and leakage problem caused by uneven settlement is avoided; meanwhile, the width of the upper groove of the advanced concrete slab is greater than the width of the post-cast strip, so that the water stop rubber strip that expands when meeting water can completely cover the post-cast strip and the two side construction joints, which are the core areas of the leakage risk, and a multiple waterproof system of the groove water retaining, the water stop strip expansion sealing and the asphalt gap sealing is formed by cooperating with the asphalt joint filling, which not only blocks the path of the groundwater into the post-cast strip, but also self-adaptively fills the small settlement cracks, effectively solves the construction joint leakage problem between the advanced concrete and the structure concrete and on both sides of the post-cast strip, and improves the long-term anti-permeability of the post-cast strip of the underground engineering bottom plate.

[0025] 2. The support scheme of the soil block and the formwork is adopted, the soil block can be flexibly filled in the narrow space to realize uniform support, after the strength of the structure concrete reaches the standard, the soil block is mudified by water injection and cleaned through the water collecting pit, the formwork can be easily removed without violent disassembly, the pain points of the conventional rigid support, such as difficult installation, difficult disassembly and easy residue, are completely solved, the construction rework and the formwork loss are reduced; the whole construction steps are clear, no new complex equipment or special materials are needed, on the premise of not increasing the construction cost, the formwork disassembly efficiency and the construction safety are improved, and the smooth and residue-free construction conditions are created for the subsequent water stop strip installation, asphalt joint filling and other processes, and the stability of the construction quality of each link is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0026] Fig. 1 A rear-pouring strip one-side construction profile drawing of a basement advanced water stop post-cast strip structure is provided for the present application;

[0027] Fig. 2 A rear-pouring strip other-side construction profile drawing of a basement advanced water stop post-cast strip structure is provided for the present application;

[0028] Fig. 3 A rear-pouring strip whole construction profile drawing of a basement advanced water stop post-cast strip structure is provided for the present application;

[0029] Fig. 4A basement advanced water stop post-cast strip structure bottom waterproof layer cross-section drawing is provided for the present application.

[0030] Legend:

[0031] 1, bottom waterproof layer; 2, advanced reinforced concrete slab; 3, soil block one; 4, formwork one; 5, concrete layer one; 6, sump; 7, soil block two; 8, formwork two; 9, concrete layer two; 10, rubber water stop belt; 11, post-cast strip; 12, construction joint; 1-1, concrete cushion layer; 1-2, waterproof coating layer; 1-3, waterproof roll material layer; 1-4, waterproof protective layer. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] Reference Figs. 1-3 An embodiment provided by the present application is as follows:

[0034] Step one: first complete the bottom waterproof layer 1 construction of the underground engineering bottom plate, and the waterproof layer includes, from bottom to top, a concrete cushion layer 1-1, a waterproof coating layer 1-2, a waterproof roll material layer 1-3, and a waterproof protective layer 1-4, which can provide a reliable waterproof base for the subsequent concrete structure and ensure that underground water does not penetrate from the bottom layer of the bottom plate;

[0035] Step two: above the bottom waterproof layer 1, an advanced reinforced concrete slab 2 is constructed by integral pouring, and a groove is formed on the upper part of the slab in the length direction of the post-cast strip 11 during the pouring process, and the width of the groove is greater than the width of the post-cast strip 11, reserving enough space for the subsequent installation of the water stop member;

[0036] Step three: after the concrete strength of the advanced reinforced concrete slab 2 reaches the design strength requirement, soil block one 3 is laid on the side corresponding to the post-cast strip 11 above the advanced reinforced concrete slab 2, and the laying range of the soil block one 3 needs to completely cover the lower support area of the subsequent installed formwork one 4; then the formwork one 4 is installed above the soil block one 3, the formwork is made of bamboo plywood or aluminum alloy formwork, and is tightly attached to the top surface of the advanced reinforced concrete slab 2 during installation, and the joint is sealed with waterproof tape, and after forming a stable support system, the bottom plate concrete layer one 5 is poured;

[0037] Step four: after the strength of the bottom plate concrete layer one 5 reaches the design strength requirement, the area where the soil blocks one 3 are located is soaked with water for not less than 24 hours, so that the soil blocks one 3 are softened and converted into mud; then the mud and accumulated water are cleaned and discharged by using a high-pressure water gun in combination with the water collecting pit 6 pre-formed on the advanced reinforced concrete plate 2, so as to ensure that there is no mud residue under the formwork 4, and finally the formwork 4 is removed;

[0038] Step five: referring to the construction process and standard of steps three to four, the soil blocks two 7 are laid and the formwork two 8 is installed on the other side of the post-pouring belt 11, and the concrete layer two 9 is poured; after the strength of the concrete layer two 9 reaches the design strength requirement, the operations of soaking with water for not less than 24 hours, cleaning the mud by using the high-pressure water gun in combination with the water collecting pit 6, and removing the formwork two 8 are repeated;

[0039] Step six: the slot formwork residue, dust and other sundries in the post-pouring belt 11 are thoroughly cleaned, the water-swelling rubber waterstop 10 with an expansion ratio of 200% to 500% and a thickness matching the groove depth of the advanced reinforced concrete plate 2 is placed in the space formed by the groove of the advanced reinforced concrete plate 2 and the bottom plate concrete layer one 5 and the concrete layer two 9, and the waterstop needs to fill the space; after the installation of the waterstop is completed, the gap between the waterstop and the surrounding concrete is embedded and sealed with asphalt;

[0040] Step seven: after the asphalt for embedding is completely cooled and solidified, the concrete of the post-pouring belt 11 is poured; after the pouring of the concrete is completed, the curing method combining covering plastic film and fire-retardant cotton is adopted, the difference between the concrete surface temperature and the ambient temperature during the curing needs to be controlled to be not more than 25℃, and the curing is performed until the concrete reaches the design strength, and finally the waterstop construction of the post-pouring belt of the underground engineering bottom plate is completed.

[0041] Finally, it should be noted that the above only describes the preferred embodiments of the present application and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A construction method for a water-stop structure of a post-cast strip of an underground engineering floor, characterized by: The steps include: S1: First, complete the construction of the base plate waterproof layer (1) to provide a waterproof base for the subsequent concrete structure and ensure that underground moisture does not penetrate from the bottom layer of the base plate; S2: above the bottom plate waterproof layer (1), an advanced reinforced concrete slab (2) is integrally cast, and a groove is provided on the upper portion of the advanced reinforced concrete slab (2) along the length direction of the post-cast strip (11); S3: After the concrete strength of the advanced reinforced concrete slab (2) reaches the design strength requirement, a soil block (3) is laid on one side of the post-casting strip (11) above the advanced reinforced concrete slab (2), and a formwork (4) is installed above the soil block (3) to form a support system, and then a bottom plate concrete layer (5) is poured; S4: After the strength of the bottom slab concrete layer 1 (5) reaches the design strength requirement, water is injected into the area where the soil block 1 (3) is located to soften the soil block 1 (3) and convert it into mud. The mud and the accumulated water are cleaned and discharged through the water collection pit (6) pre-opened on the advanced reinforced concrete slab (2), and then the formwork 1 (4) is removed; S5: Referring to the construction process and standards of steps S3 to S4, lay soil block 2 (7) on the other side of the post-casting strip (11), install formwork 2 (8), pour concrete layer 2 (9), and after the strength of concrete layer 2 (9) reaches the standard, repeat the water injection, mud cleaning and formwork 2 (8) removal operations; S6: Thoroughly clean the template residue, dust and other debris in the groove of the post-cast strip (11), and place the rubber water stop (10) into the space formed by the groove of the advanced reinforced concrete slab (2) and the bottom slab concrete layer 1 (5) and concrete layer 2 (9), and the rubber water stop (10) fills the space; S7: Pour the concrete of the post-casting strip (11), cure it to the designed strength, and complete the water-stop construction of the post-casting strip of the underground engineering floor.

2. The construction method of the water-stop structure of the post-cast strip of the underground engineering floor according to claim 1 is characterized by: The width of the groove at the upper end of the advanced reinforced concrete slab (2) is greater than the width of the post-cast strip (11).

3. The construction method of the water-stop structure of the post-cast strip of the underground engineering floor according to claim 1 is characterized by: After the construction of the rubber waterstop (10) is completed, asphalt is used to caulk and seal the gap between the rubber waterstop (10) and the surrounding concrete.

4. The construction method of the water-stop structure of the post-cast strip of the underground engineering floor according to claim 3 is characterized by: The rubber waterstop (10) is a water-swelling rubber waterstop.

5. The construction method of the water-stop structure of the post-cast strip of the underground engineering floor according to claim 4 is characterized in that: The expansion ratio of the rubber waterstop (10) when exposed to water is 200% to 500%, and the thickness of the waterstop is adapted to the depth of the groove on the advanced reinforced concrete slab (2).

6. The construction method of the water-stop structure of the post-cast strip of the underground engineering floor according to claim 1 is characterized by: The laying range of the soil block 1 (3) and the soil block 2 (7) completely covers the supporting area below the template 1 (4) and the template 2 (8).

7. The construction method of the underground engineering floor post-casting zone water-stop structure according to claim 6, characterized in that: The template 1 (4) and the template 2 (8) are made of bamboo plywood or aluminum alloy templates, and when the templates are installed, they are tightly fitted to the top surface of the advanced reinforced concrete slab (2), and the joints are sealed with waterproof tape.

8. The construction method of the water-stop structure of the post-cast strip of the underground engineering floor according to claim 1 is characterized by: The bottom plate waterproof layer (1) comprises, from bottom to top, a concrete cushion layer (1-1), a waterproof coating layer (1-2), a waterproof coiled material layer (1-3) and a waterproof protective layer (1-4).

9. The construction method of the water-stop structure of the post-cast strip of the underground engineering floor according to claim 1, characterized in that: The soaking time of water injection shall be no less than 24 hours, and when cleaning the mud, a high-pressure water gun shall be used in conjunction with the sump (6) to flush it, ensuring that there is no mud residue under the template 1 (4) and template 2 (8).

10. The construction method of the water-stop structure of the post-cast strip of the underground engineering floor according to claim 1, characterized in that: After the concrete of the post-casting zone (11) is poured, a curing method combining covering with a plastic film and a flame-retardant quilt is adopted, and the difference between the surface temperature of the concrete and the ambient temperature during the curing period does not exceed 25°C.

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