Post-cast strip concrete jacking construction structure sealed by prefabricated cover plate in advance

Abstract

The utility model discloses a concrete jacking construction structure for sealing a post-cast strip in advance by a prefabricated cover plate, and relates to a post-cast strip sealing construction structure of a building basement top plate. The common cover plate and the cover plate with the hole completely cover the post-cast strip; the jacking pumping pouring device is arranged in the underground garage, and a steel pipe serving as an exhaust channel during pouring is arranged on the perforated cover plate; the jacking pumping pouring device comprises a top plate, a spiral compression spring, a pouring pipe, a pipeline and a concrete conveying pump. The top plate is arranged below the top plate formwork below the common cover plate, a spiral compression spring is arranged below the top plate, and the lower end of the spiral compression spring abuts against a transverse rod of the scaffold. The pouring pipe is installed on the top plate, the upper end of the pouring pipe penetrates through the top plate formwork to extend into the post-pouring belt, and the lower end of the pouring pipe is connected with the concrete conveying pump through a pipeline. The problems that in the prior art, the construction technology that a cover plate is adopted to cover a post-cast strip can affect ground garden process construction, and the completed ground garden engineering can be damaged are solved.

Description

Technical Field

[0001] The utility model relates to the field of building construction, in particular to a sealing construction structure for post-cast strips on the top slab of a building basement. Background Technique

[0002] For marketing needs of commercial housing to meet the real scene experience of home buyers, a partial landscape garden is completed at the same time as the sales office is opened to form a viewing passage. It can no longer meet the experience of home buyers just to look at the sand table when they enter the sales office. Letting home buyers experience the quality of the park during the process of entering the show flat has become a common method for major real estates.

[0003] However, the construction of the landscape garden in a commercial housing community needs to be backfilled in advance, and there is an underground garage under the landscape garden of the commercial housing community. During the construction of the post-cast strip on the top slab of the underground garage of the commercial housing, according to the requirements of the structural design code and the building construction code, the concrete pouring of the settlement post-cast strip on the top slab of the garage must be carried out 14 days after the completion of all the main building structures before the construction of the post-cast strip can be carried out. This restricts the construction of the ground landscaping project in advance, and the construction of the remaining settlement post-cast strip will make it almost impossible to construct the outdoor landscaping project.

[0004] Chinese patent document CN117702933A discloses a method for constructing with soil covering first at the post-cast strip. After the construction of the underground main structure is completed, an internal scaffold is first erected for the construction of the top slab of the basement; then the prefabricated post-cast strip cover plate is covered on the post-cast strip, and the post-cast strip is poured through the pouring pipe on the cover plate; finally, the pouring pipe is blocked with concrete. This technology enables waterproofing and soil covering to be carried out prior to the construction of the post-cast strip, greatly saving the construction period. However, since the post-cast strip is poured above the ground, during the pouring, concrete trucks and concrete pumps will affect the construction of the ground landscaping project and will also damage the completed ground landscaping project.

[0005] In view of this, the present utility model is specifically applied for. Content of the Utility Model

[0006] The utility model provides a precast cover plate for pre-closed post-cast strip concrete jacking construction structure, which solves the problems that the existing construction technology using a cover plate to cover the post-cast strip will affect the construction of the ground landscaping project and will also damage the completed ground landscaping project.

[0007] To solve the above problems, the utility model adopts the following technical solutions: a precast cover plate pre-closed post-cast strip concrete jacking construction structure, including the underground garage roof 1, the uncast post-cast strip 2 on the underground garage roof 1, the roof formwork 5 below the post-cast strip 2, the scaffold 6 supported under the roof formwork 5, and the perforated cover plate 3 and the ordinary cover plate 4 that sequentially cover the post-cast strip 2, and the ordinary cover plate 4 and the perforated cover plate 3 completely cover the post-cast strip 2; it also includes a jacking pumping and casting device 7 arranged in the underground garage. The perforated cover plate 3, the ordinary cover plate 4 and the ground landscape garden stone base layer 8 are laid on the underground garage roof 1. There is a steel pipe 31 on the perforated cover plate 3 as an exhaust channel during casting; the jacking pumping and casting device 7 includes a roof plate 71, a spiral compression spring 73, a casting pipe 74, a pipeline 76 and a concrete pump 77; the roof plate 71 is arranged under the roof formwork 5 below the ordinary cover plate 4, and a spiral compression spring 73 is arranged below the roof plate 71, and the lower end of the spiral compression spring 73 abuts against the cross bar of the scaffold 6; the casting pipe 74 is installed on the roof plate 71, the upper end of the casting pipe 74 passes through the roof formwork 5 and extends into the post-cast strip 2, and the lower end of the casting pipe 74 is connected to the concrete pump 77 through the pipeline 76.

[0008] Furthermore, the precast cover plate pre-closed post-cast strip concrete jacking construction structure of the utility model also has the following characteristics: a check valve 75 is also installed between the casting pipe 74 and the concrete pump 77.

[0009] Furthermore, the precast cover plate pre-closed post-cast strip concrete jacking construction structure of the utility model also has the following characteristics: a casting blocking device 33 for preventing concrete from spraying out is arranged in the steel pipe 31. The casting blocking device 33 includes a fixed disk 331 and a sliding disk 333. The periphery of the fixed disk 331 is fixed on the inner wall of the steel pipe 31. The sliding disk 333 is located below the fixed disk 331. A guide rod 334 is fixed at the center position of the sliding disk 333. The guide rod 334 is slidably matched with the hole at the center of the fixed disk 331. A limit cover 335 is arranged at the end of the guide rod 334. An air vent 332 is also arranged on the fixed disk 331. When the sliding disk 333 moves upward, the air vent 332 is closed.

[0010] The technical advantages of the utility model:

[0011] 1. Improve the existing technology, use the steel pipe of the perforated cover plate as the ventilation pipe for casting, and adopt the jacking pumping method to carry out concrete operation under the underground garage roof, realizing the idea of "pre-closed backfill and then cast concrete" for the post-cast strip, breaking the traditional method that the post-cast strip must be "cast open and vibrated simultaneously".

[0012] 2. By using precast cover plates, reserved steel pipes, slightly expanded (self-compacting) concrete, and jacking pumping technology, and applying the advanced pouring technology of the basement floor post-cast strip with reverse thinking, the requirement of backfilling the top slab in advance is met, which neither affects the settlement of the main structure nor enables the normal interspersed construction of the basement top slab waterproof project and other outdoor projects. It can ensure that the garden construction in the commercial housing community is synchronized with the main body, and the outdoor project is synchronized with the external wall decoration, ensuring the project progress while guaranteeing the project quality.

[0013] 3. The utility model is applicable to settlement type post-cast strips, and for commercial housing communities that are restricted by post-cast strips but still need to carry out backfill soil construction in advance to meet the requirements of garden landscape display, where the basement top slab waterproof project and other outdoor projects need to be normally interspersed, and the basement decoration is synchronized with the main body, and the outdoor project is synchronized with the external wall decoration. It is applicable to the construction of high-rise and above buildings with a relatively long main structure construction period.

[0014] 4. Economic benefits: It saves the waste of man-hours and raw materials caused by the retaining walls that need to be built on both sides of the post-cast strip due to the inability to pour the post-cast strip in time and the inability to backfill locally; it saves the waterproof lap joint and waterproof protection required for the non-closure of the waterproof on both sides of the post-cast strip; when using jacking pumping to pour the post-cast strip, there is no need to demolish the newly made landscape display, no need to dig out the backfill soil, no need to break the precast cover plate, and no need to restore it again; for the part using the reserved pipe pumping method, there is no need to demolish the newly made landscape display, no need to dig out the backfill soil, and no need to break the precast cover plate.

[0015] 5. Social benefits: This technology is simple to install and disassemble, easy to understand, simple, labor-saving, material-saving, and pollution-free. It is applicable to most high-rise building projects with a relatively long main construction period, and can be interspersed with indoor decoration, outdoor pipe networks, roads, greening, etc. in advance without being affected by the main construction progress. At the same time, it meets the requirements of project quality and on-site process interspersed. When making the precast cover plates used in construction, all the surplus formwork, steel bars, and concrete during the main project construction can be used, without the need to add materials, and it greatly shortens the usage cycle of materials such as steel pipes and fasteners, and is more energy-saving and environmentally friendly. The application of the pre-closure technology for settlement post-cast strips effectively solves the problem of inability to plan the site due to limited space. 70% of building materials can be stored in the garage, providing convenient conditions for reasonable on-site planning. The construction method meets the relevant requirements of the national building energy conservation project and has good social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural view of the post-cast strip of the underground garage top slab on the ground of the utility model;

[0017] Figure 2 is a schematic structural view of the post-cast strip of the underground garage top slab with only one perforated cover plate laid;

[0018] Figure 3 is Figure 1A-A sectional view;

[0019] Figure 4 is a perspective view of the cover plate with holes;

[0020] Figure 5 is a perspective view of the ordinary cover plate;

[0021] Figure 6 is Figure 1 B-B sectional view;

[0022] Figure 7 is Figure 3 partial enlarged view at I;

[0023] Figure 8 is a perspective view of the casting plugging device;

[0024] Figure 9 is a schematic structural diagram of the jacking pumping casting device.

[0025] Explanation of symbols in the figure: underground garage roof 1, roof reinforcement 11, ground floor of the first basement 12, post-cast strip 2, cover plate with holes 3, steel pipe 31, gasket 32, casting plugging device 33, fixed plate 331, ventilation hole 332, sliding plate 333, guide rod 334, limit cover 335, ordinary cover plate 4, roof formwork 5, scaffolding 6, jacking pumping casting device 7, roof slab 71, gasket 72, helical compression spring 73, casting pipe 74, check valve 75, pipeline 76, concrete pump 77, ground landscape garden stone foundation layer 8. Detailed implementation mode

[0026] The following uses the best embodiments to describe the present invention in detail.

[0027] As Figure 1-2As shown in the figure, the precast cover plate is used to seal the post-cast strip concrete lifting construction structure in advance, which includes the underground garage roof 1, the uncast post-cast strip 2 on the underground garage roof 1, the roof formwork 5 below the post-cast strip 2, the scaffolding 6 supported under the roof formwork 5, and the perforated cover plate 3 and the ordinary cover plate 4 that are successively covered on the post-cast strip 2. A sealing gasket 32 is arranged between the lower edge positions of the ordinary cover plate 4 and the perforated cover plate 3 and the underground garage roof 1. The perforated cover plate 3 is arranged every two meters, and the ordinary cover plate is arranged at other positions. The ordinary cover plate 4 and the perforated cover plate 3 completely cover the post-cast strip 2; the roof reinforcement 11 of the underground garage roof 1 penetrates into the post-cast strip 2; on the perforated cover plate 3, the ordinary cover plate 4 and the underground garage roof 1, a ground landscape garden stone base layer 8 is laid. There is a steel pipe 31 on the perforated cover plate 3 that connects the post-cast strip 2 with the outside world. The steel pipe 31 serves as the exhaust channel for pouring the post-cast strip 2. The purpose is to ensure smooth grouting, keep the air flowing during pouring, facilitate the discharge of the gas inside, and prevent the air pressure in the post-cast strip 2 from reaching a certain level to block the grouting flow and cause air bubbles or voids in the grouting.

[0028] As Figure 6 , 9 shown in the figure, the utility model further includes a jacking pumping and pouring device 7 arranged in the underground garage. The jacking pumping and pouring device 7 includes a roof plate 71, a spiral compression spring 73, a pouring pipe 74, a pipeline 76 and a concrete pump 77; the roof plate 71 is arranged under the roof formwork 5 below the ordinary cover plate 4. A gasket 72 is arranged between the roof plate 71 and the roof formwork 5. A spiral compression spring 73 is arranged below the roof plate 71. The spiral compression spring 73 is sleeved on the vertical pole of the scaffolding 6, and the lower end of the spiral compression spring 73 abuts against the cross bar of the scaffolding 6; the gasket 72 plays a sealing role when elastically pressing the roof plate 71 tightly. The pouring pipe 74 is installed on the roof plate 71. The upper end of the pouring pipe 74 passes through the roof formwork 5 and extends into the post-cast strip 2. The lower end of the pouring pipe 74 is connected to the concrete pump 77 through the pipeline 76. A check valve 75 is also installed between the pouring pipe 74 and the concrete pump 77. The check valve 75 prevents the concrete from flowing back.

[0029] As Figure 7-8As shown in the figure, when pouring concrete into the post-cast strip 2 through the jacking pumping and pouring device 7, the steel pipe 31 of the perforated cover plate 3 plays a role in ventilation. A pouring plugging device 33 for preventing the concrete from spraying out is arranged in the steel pipe 31. The pouring plugging device 33 includes a fixed plate 331 and a sliding plate 333. The periphery of the fixed plate 331 is fixed on the inner wall of the steel pipe 31. The sliding plate 333 is located below the fixed plate 331. A guide rod 334 is fixed at the central position of the sliding plate 333. The guide rod 334 is slidably matched with the hole at the center of the fixed plate 331. A limit cover 335 is arranged at the end of the guide rod 334. When the limit cover 335 slides down, the limit cover 335 is stuck around the central hole to prevent falling off. A ventilation hole 332 is also arranged on the fixed plate 331. When the sliding plate 333 moves upward, the ventilation hole 332 is closed. When pouring concrete, the concrete enters the steel pipe 31 and pushes the sliding plate 333 to move upward to close the ventilation hole 332, thereby preventing the concrete from spraying out of the steel pipe 31.

[0030] The basic principle of the process is:

[0031] Cover the post-cast strip of the underground garage roof with precast cover plates and seal it in advance. The cover plates are divided into reserved pouring hole cover plates and ordinary cover plates. Add a perforated cover plate every 2 meters. The pouring holes are butt-welded with the steel bars of the perforated cover plates using steel pipes. The length of the steel pipes is determined according to the covering thickness of the green belt. After the sealing is completed, a leveling layer is made on the cover plates. Then, the waterproof layer of the cover plates and the waterproof layer of the garage roof are overlapped with staggered joints. After the treatment is completed, pour a fine stone protective layer and then the earthwork backfilling operation of the garage roof can be carried out. After the main body is capped and reaches the required retention time as designed, use slightly expanded (self-compacting) concrete to be poured through the jacking pumping and pouring device arranged in the underground garage.

[0032] When pouring concrete, by selecting slightly expanded (self-compacting) concrete with strong fluidity, the concrete strength can be ensured without vibration, meeting the design requirements. Ordinary slightly expanded concrete can also be used, increasing the number of reserved ventilation steel pipes, controlling the spacing of the reserved steel pipes to meet the range that can be affected by the vibrating rod, and inserting the vibrating rod into the reserved steel pipes for vibration. The garden construction work in the commercial housing community is completed in advance, and it is not possible to carry out pouring work on the upper part. The jacking pumping method is used to carry out concrete work under the slab (in the basement). This technology realizes the idea of "sealing and backfilling first, and then pouring concrete" for the post-cast strip, breaking the traditional method that the post-cast strip must be "poured open and vibrated simultaneously".

[0033] The key technical points of this construction:

[0034] Process flow: Fabricate precast cover slab molds → Bind steel bars for precast cover slabs → Install steel pipes for reserved casting holes → Pour concrete for precast cover slabs → Erect support scaffolding for the post-cast strip of this span → Install the cover slab of the post-cast strip with lime-sand bricks (pay attention to the spacing of the casting openings) → Apply arc-shaped waterproof mortar to the footstep and treat the waterproof base → Construct the waterproof layer → Construct the waterproof protective layer → Backfill soil and carry out garden construction → Pour micro-expansion (or self-compacting) concrete using the reserved pipeline and jacking pumping method → Cure the concrete → Seal the pipe orifice anchor plate and do waterproofing → Remove the formwork.

[0035] By applying four technologies, namely precast cover slabs, reserved pipelines, micro-expansion (self-compacting) concrete, and jacking pumping method, and using reverse thinking to apply the advanced water-stop technology for the basement floor post-cast strip, the requirement of early backfilling of the top slab is met.

[0036] The pouring time of the basement post-cast strip depends on various factors, including the type of post-cast strip (expansion type or settlement type), the setting time of the concrete, and the settlement condition of the building.

[0037] For expansion-type post-cast strips, the post-cast strip is usually poured 60 days after the concrete is poured. This is because the main function of the expansion-type post-cast strip is to adapt to the temperature change and shrinkage of the concrete. Therefore, it is necessary to wait for the concrete to completely set and reach a stable shrinkage state.

[0038] For settlement-type post-cast strips, the pouring time depends on the settlement condition of the main structure. Generally, it is necessary to pour the post-cast strip after the main project is completed and the settlement is observed to be stable (usually 30 days). The standard for settlement stability is that the settlement difference between the two sides is not more than 1 - 2 mm / month.

[0039] In addition, some specifications also indicate that the pouring time of the post-cast strip can be after the concrete on both sides reaches a certain strength. Some specifications are 28 days, while others are 42 days. In actual operation, the pouring time of the post-cast strip should be determined according to the design requirements and the specific situation of the project.

Claims

1. A prefabricated cover plate for sealing a post-cast strip concrete jacking construction structure in advance, comprising an underground garage roof (1), an uncast post-cast strip (2) on the underground garage roof (1), a roof template (5) below the post-cast strip (2), a scaffold (6) supported below the roof template (5), and a perforated cover plate (3) and an ordinary cover plate (4) sequentially covering the post-cast strip (2), wherein the ordinary cover plate (4) and the perforated cover plate (3) completely cover the post-cast strip (2); characterized in that: The invention also comprises a jacking pumping pouring device (7) arranged in the underground garage, wherein a ground landscape garden stone foundation layer (8) is laid on the perforated cover plate (3), the ordinary cover plate (4) and the top plate (1) of the underground garage, and a steel pipe (31) is provided on the perforated cover plate (3) to serve as an exhaust passage during pouring; the jacking pumping pouring device (7) comprises a top plate (71), a helical compression spring (73), a pouring pipe (74), a pipeline (76) and a concrete delivery pump (77); the top plate (71) is arranged below the top plate template (5) below the ordinary cover plate (4), a helical compression spring (73) is arranged below the top plate (71), and the lower end of the helical compression spring (73) is supported on the cross bar of the scaffold (6); the pouring pipe (74) is installed on the top plate (71), the upper end of the pouring pipe (74) passes through the top plate template (5) and extends into the post-casting strip (2), and the lower end of the pouring pipe (74) is connected to the concrete delivery pump (77) through the pipeline (76).

2. The prefabricated cover plate pre-sealed post-cast zone concrete jacking construction structure as claimed in claim 1, characterized in that: A check valve (75) is also installed between the pouring pipe (74) and the concrete delivery pump (77).

3. The prefabricated cover plate pre-sealed post-cast zone concrete jacking construction structure as claimed in claim 1, characterized in that: A pouring plugging device (33) for preventing concrete from spraying out is arranged in the steel pipe (31), and the pouring plugging device (33) comprises a fixed plate (331) and a sliding plate (333). The periphery of the fixed plate (331) is fixed on the inner wall of the steel pipe (31), and the sliding plate (333) is located below the fixed plate (331). A guide rod (334) is fixed at the center of the sliding plate (333), and the guide rod (334) is slidably matched with a hole in the center of the fixed plate (331). A limit cover (335) is arranged at the end of the guide rod (334). A vent hole (332) is also arranged on the fixed plate (331), and the vent hole (332) is closed after the sliding plate (333) moves upward.

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