Shaped clamp type side mold structure for post-cast strip of raft foundation

Abstract

The utility model discloses a shaping clamp type side mold structure for a post-cast strip of a raft foundation, which belongs to the technical field of raft foundation templates and specifically structurally comprises a lower shaping clamp side mold, an upper shaping clamp side mold, a side mold back ridge, a vertical back ridge, an inclined strut and a horizontal support. The lower shaping clamp side mold is installed at the position of a post-cast strip, the upper shaping clamp side mold is installed over the lower shaping clamp side mold, a steel edge rubber water stop belt is clamped between the lower shaping clamp side mold and the upper shaping clamp side mold, and four side mold back ridges are fixedly connected to the upper side edge and the lower side edge of the face, to be supported, of each of the lower shaping clamp side mold and the upper shaping clamp side mold. A plurality of vertical back ridges are fixedly connected outside the four side die back ridges at intervals, inclined struts are fixedly connected to the upper ends of the vertical back ridges, the lower ends of the vertical back ridges abut against one ends of horizontal supports, and the other ends of the horizontal supports abut against steel bar ground anchors. The shaping clamp type side die is adopted, the die plate is convenient to mount and dismount, the turnover rate is high, and management is convenient.

Description

Technical Field

[0001] This utility model belongs to the technical field of post-cast strip molds for raft foundations, and relates to a standardized clamp-type side mold structure for post-cast strips of raft foundations. Background Technology

[0002] In the installation of steel-edged rubber waterstops for the post-pouring strip of raft foundations, there are many methods for installing formwork at the post-pouring strip, such as quick-closing mesh, steel plate mesh, and wire mesh. However, these methods require the use of angle steel, welded reinforcing bars, and other fixing measures in conjunction with the installation of the steel-edged rubber waterstop, making construction process review and operation inconvenient. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a standardized clamp-type side formwork structure for the post-cast strip of raft foundation, which is convenient for formwork installation and disassembly, has a high turnover rate, and is easy to manage.

[0004] The technical solution adopted by this utility model is as follows: A standardized clamp-type side mold structure for post-cast strips of raft foundations, including a lower standardized clamp side mold, an upper standardized clamp side mold, side mold back ribs, vertical back ribs, diagonal braces, and horizontal supports. The lower standardized clamp side mold is installed at the position of the post-cast strip, and the upper standardized clamp side mold is installed directly above the lower standardized clamp side mold with a steel-edged rubber waterstop sandwiched between them. Four side mold back ribs are fixedly connected to the upper and lower edges of the side to be supported of the lower and upper standardized clamp side molds. Multiple vertical back ribs are fixedly connected at intervals to the four side mold back ribs. A diagonal brace is fixedly connected near the upper end of the vertical back rib, and the lower end abuts against one end of the horizontal support. The other end of the horizontal support abuts against the steel reinforcement anchor. The steel reinforcement anchor is inserted into the cushion layer. The other end of the diagonal brace abuts against the valve plate reinforcement perpendicular to it.

[0005] Furthermore, the aforementioned vertical back bracing and steel reinforcement anchors are installed every 80-100cm.

[0006] Furthermore, both the lower and upper standardized fixture side molds are composed of multiple templates, and the back ribs of the side molds are composed of multiple wooden blocks, with each wooden block fixedly connecting two adjacent templates.

[0007] Compared to existing technologies, this utility model adopts standardized clamp-type side formwork, which facilitates formwork installation and disassembly, has a high turnover rate, and is easy to manage. Compared to methods such as quick-closing mesh, it only requires 22 standard formwork sheets and approximately 200 timbers for reuse, with the steel reinforcement anchors made from scrap steel, resulting in low construction costs. After the post-pouring construction is completed, it can also be used for the bottom formwork of the main structure beams and slabs. This reduces construction costs and improves economic efficiency. Compared to existing technologies, this utility model adopts standardized clamp-type side formwork, which facilitates formwork installation and disassembly, has a high turnover rate, and is easy to manage. Compared to methods such as quick-closing mesh, it only requires 22 standard formwork sheets and approximately 200 timbers for reuse, with the steel reinforcement anchors made from scrap steel, resulting in low construction costs. 2 The formwork can be reused, requiring only 22 standard formwork sheets and approximately 200 timbers. Waste steel bars are used for the reinforcing steel anchors, resulting in low construction costs. After the post-pouring construction is completed, the formwork can also be used for the bottom formwork of the main structure beams and slabs, further reducing construction costs and improving economic efficiency. Attached Figure Description

[0008] Figure 1 This is a plan view of a standardized fixture-type side mold;

[0009] Figure 2 Elevation view of the standardized fixture-type side mold;

[0010] Figure 3 This is a schematic diagram of the construction process for a standardized clamp-type side formwork structure used for post-cast strips in raft foundations. Detailed Implementation

[0011] The utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0012] Example 1: As Figures 1-3 As shown, a standardized clamp-type side formwork structure for post-cast strips in raft foundations includes a lower standardized clamp-type side formwork 1, an upper standardized clamp-type side formwork 2, side formwork back ribs 3, vertical back ribs 4, diagonal braces 5, and a horizontal support 6. The lower standardized clamp-type side formwork 1 is installed at the post-cast strip position, and the upper standardized clamp-type side formwork 2 is installed directly above the lower standardized clamp-type side formwork 1, with a steel-edged rubber waterstop 7 sandwiched between them. Four side formwork back ribs 3 are fixedly connected to the upper and lower edges of the side to be supported of the lower standardized clamp-type side formwork 1 and the upper standardized clamp-type side formwork 2. Multiple vertical back ribs 4 are fixedly connected at intervals to the four side formwork back ribs 3. The vertical back ribs 4 are fixedly connected to the diagonal braces 5 near their upper ends and abut against one end of the horizontal support 6 at their lower ends. The other end of the horizontal support 6 abuts against a steel reinforcement anchor 8, which is inserted into the pad layer 10. The other end of the diagonal brace 5 abuts against a valve plate steel reinforcement 9 perpendicular to it.

[0013] Furthermore, the aforementioned vertical back bracing 4 and steel reinforcement anchor 8 are installed every 80-100cm.

[0014] Furthermore, both the lower fixed fixture side mold 1 and the upper fixed fixture side mold 2 are composed of multiple templates, and the side mold back rib 3 is composed of multiple wooden blocks, with each wooden block fixedly connecting two adjacent templates.

[0015] The operating principle is as follows: To ensure the steel-edged rubber waterstop is fixed and can support the lateral pressure of the concrete, a standardized clamp-type side formwork is used, including a lower standardized clamp-type side formwork 1, an upper standardized clamp-type side formwork 2, steel reinforcement anchors, diagonal braces, and horizontal supports 6. The lower and upper standardized clamp-type side formwork 1 and 2 are designed and manufactured according to standardized specifications. The clamp-type side formwork replaces the traditional welding method for fixing the waterstop, eliminating the need for auxiliary methods such as welding steel reinforcement to install the waterstop. The smaller side formwork is mass-produced in the processing plant and can be quickly assembled and dismantled on-site. Scrap steel reinforcement is driven into the subbase as steel reinforcement anchors, providing stress points for the horizontal and diagonal supports of the side formwork and controlling the displacement and deformation of the side formwork.

[0016] Example 2: Figure 3 As shown, a construction method for a standardized clamp-type side formwork structure for post-cast strips in raft foundations is as follows:

[0017] 1. Construction Preparation

[0018] (1) Scheme preparation and submission for approval

[0019] A construction plan should be developed based on the characteristics of the project, and implemented after approval. Safety and technical briefings should be conducted for all personnel before implementation. The plan should also include calculations for the following aspects:

[0020] 1) Calculate the amount of steel reinforcement and stirrups required for the raft foundation based on the design drawings.

[0021] 2) Calculate the short side dimensions of the standardized clamp-type side formwork. Familiarize yourself with the drawings and the detailed drawings of the post-cast strip. Based on the clear distance between the bottom and top reinforcement bars of the raft slab and the thickness of the steel-edged rubber waterstop, calculate the short side dimensions of the lower and upper standardized side formwork.

[0022] 3) Calculate the installation length of the steel-edged waterstop. Calculate the required length of the steel-edged rubber waterstop based on the length of the post-cast strip.

[0023] 4) Calculate the fixed dimensions of the steel plate rubber waterstop. According to the post-cast strip detail drawing, the steel edge rubber waterstop is installed horizontally in the center, and the exposed length of the first-cast side is 175mm.

[0024] 5) Calculate the number of back braces and ground anchor bars required for the side mold of the standardized fixture.

[0025] (2) Fabrication of side molds for standardized fixtures

[0026] The thickness of the raft foundation of the pretreatment pool is 1m. The bottom and top reinforcement of the raft foundation are HRB400E double-layer bidirectional steel with a diameter of 28mm. The concrete cover of the reinforcement is 40mm. The steel-edged rubber waterstop is 350*10mm in size. The clear distance between the upper and lower reinforcement of the raft foundation is 750mm. The 1830mm*915mm is cut into small templates with a size of 370mm*1830mm. A wooden block is nailed to each end of the small template. The length of the wooden block is 3m. The excess length of the wooden block is used to connect the subsequent small templates.

[0027] 2. Installation of standardized clamp-type side molds and steel plate rubber waterstops

[0028] After the bottom reinforcement of the raft slab is tied, the prefabricated lower fixed clamp side formwork is installed at the post-pouring strip position. Then, the steel-edged rubber waterstop is installed, followed by the upper fixed clamp side formwork. A vertical back rib is installed every 91.5cm, and a steel anchor is set every 80-100cm (preferably 91.5cm). The steel anchor is driven into the pad layer at least 20cm as the stress point for horizontal support. Diagonal supports are installed at the same time as horizontal supports to ensure that the lateral pressure during the pouring of raft slab concrete can be met.

[0029] 3. Concrete pouring

[0030] (1) Before concrete pouring, the steel bars, steel-edged rubber waterstops, formwork, etc. should be inspected to ensure the stability of the raft slab side formwork and the post-pouring strip side formwork.

[0031] (2) Before pouring the raft foundation, the pad surface and formwork should be moistened with water in advance to avoid absorbing water from the concrete, which would affect the water-cement ratio of the concrete and thus affect the strength and appearance quality of the concrete.

[0032] (3) The slump of the concrete should be controlled within 180°C; the temperature of the concrete entering the formwork should be controlled between 5°C and 30°C.

[0033] (4) Concrete is poured in layers using a boom pump; the layer thickness is controlled between 300 and 500 mm.

[0034] (5) Use the secondary vibration method to vibrate and pour concrete in layers and sections to prevent the accumulation of hydration heat.

[0035] 4. Formwork removal and reuse

[0036] (1) Once the concrete for the raft foundation is poured, the concrete strength is sufficient to ensure that its surface and edges are not damaged by the removal of the formwork before it can be removed.

[0037] (2) During the demolding process, it is strictly forbidden to pry or bend the raft foundation from the edge to avoid damaging the steel-edged rubber waterstop. The removed formwork must be cleaned (cement slurry removed), damaged formwork replaced, and stacked neatly for reuse.

[0038] (3) After the formwork is removed, watering and curing shall be carried out for no less than 14 days to promote the early strength development of concrete and avoid cold joints and deformation caused by excessive temperature or dryness.

[0039] The single-piece size of the side formwork is calculated to be 370*1830 based on the clear distance between the top and bottom reinforcing bars of the raft slab; the installation of the steel-edged rubber waterstop should be straight and centered, so that the exposed size of the first-poured side is 175mm; the insertion depth of the reinforcing bar ground anchor is greater than 20cm to ensure the stability of the bottom of the side formwork; before concrete mixing, arrange management personnel to be stationed at the commercial concrete plant to supervise whether the addition (by weight) of admixtures such as anti-corrosion agents and crack-resistant fibers is consistent with the trial mix report issued by a third party; strictly control the slump of the concrete, and randomly check the slump (180) of the concrete at the pouring location during the concrete pouring process. If it does not meet the design requirements, professional technicians from the commercial concrete plant will make adjustments. Adding water during construction is strictly prohibited. The concrete is vibrated using a two-stage vibration method and poured in layers and sections to prevent the accumulation of hydration heat. The layer thickness of the concrete is strictly controlled to be 300-500mm. Before pouring the concrete, the formwork and subbase are moistened with water, but water accumulation is not allowed. During concrete vibration, the vibrator must not come into contact with the steel-edged rubber waterstop. After the concrete is poured, the formwork can be removed once the concrete strength is sufficient to ensure that its surface and edges are not damaged by the removal of the formwork. After the formwork is removed, it is cured with water for 14 days.

[0040] This utility model adopts a standardized clamp-type side formwork, which is convenient for formwork installation and disassembly, has a high turnover rate, and is easy to manage. Compared with methods such as quick-closing mesh, it only requires 22 standard formwork sheets and about 200 timbers for reuse, with the steel reinforcement anchors made from scrap steel, resulting in low construction costs. After the post-pouring construction is completed, it can also be used for the bottom formwork of the main structure beams and slabs. This reduces construction costs and improves economic efficiency. Compared with other methods, this utility model adopts a standardized clamp-type side formwork, which is convenient for formwork installation and disassembly, has a high turnover rate, and is easy to manage. Compared with methods such as quick-closing mesh, it only requires 22 standard formwork sheets and about 200 timbers for reuse, with the steel reinforcement anchors made from scrap steel, resulting in low construction costs. 2 The formwork is reusable, requiring only 22 standard formwork sheets and approximately 200 timbers. Waste steel bars are used for the ground anchors, resulting in low construction costs. After the post-pouring construction is completed, the formwork can also be used for the bottom formwork of the main structure beams and slabs. This reduces construction costs and improves economic efficiency.

[0041] Table 1. Main Material List for Quick and Easy Closure Mesh Formwork

[0042] Unit / Section

[0043]

[0044] Note: ① Steel-edged waterstop strip, including labor cost, is 35 yuan / m.

[0045] Table 2. Standardized Fixture-Type Side Mold Material List

[0046] Unit / Section

[0047]

[0048] Note: ① The steel edge waterstop includes a labor cost of 35 yuan / m.

[0049] From the comparison table of main materials for the two construction methods above, it can be seen that, compared with the table of materials required for formwork engineering, using standardized clamp-type side formwork can save 0.65 million yuan. The more post-pouring strips there are, the more significant the effect will be. Furthermore, quick-closing mesh, steel edge mesh, wire mesh, and other similar materials cannot be reused.

[0050] This side formwork structure solves the construction challenges of installing and dismantling the steel-edged waterstop in the post-cast strip. It utilizes standardized clamp-type side formwork reinforced with timber and steel anchors, giving the formwork a certain rigidity and stability. While meeting the requirements for fixing the steel-edged rubber waterstop, it also considers economy and practicality. After demolding, the concrete in the post-cast strip is free of quality defects such as cold joints, honeycombing, and pitting. The steel-edged rubber waterstop shows no misalignment or deformation. It also solves the problems of limited sealing and strength of the steel-edged rubber waterstop fixing measures and quick-closing mesh / wire mesh.

[0051] In summary, the side mold structure of the present invention has the following advantages:

[0052] (1) Standardized small side molds can be mass-produced in woodworking workshops.

[0053] (2) Using standardized clamp-type side molds can speed up construction and save costs.

[0054] (2) It has a simple structure and is easy to operate. No other auxiliary methods are needed to fix the waterstop. There are no openings in the side formwork, so there is no leakage of grout. The appearance quality of the wall concrete is good.

[0055] (3) The steel-edged rubber waterstop has a good fixing effect, with no deviation or displacement. After the concrete is poured, there are no quality defects such as bulging of the concrete at the post-pouring strip.

[0056] (4) Easy to assemble and disassemble. The side mold is made of wooden back ribs connected to form a long template, and the template can be assembled and disassembled quickly.

[0057] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A standardized clamp-type side formwork structure for post-cast strips in raft foundations, characterized in that, It includes a lower shaped fixture side mold (1), an upper shaped fixture side mold (2), a side mold back rib (3), a vertical back rib (4), a diagonal brace (5), and a horizontal support (6). The lower shaped fixture side mold (1) is installed at the position of the post-cast strip, and the upper shaped fixture side mold (2) is installed directly above the lower shaped fixture side mold (1) with a steel-edged rubber waterstop (7) sandwiched between them. The lower shaped fixture side mold (1) and the upper shaped fixture side mold (2) Four side mold back ribs (3) are fixedly connected to the upper and lower edges of the side to be supported. Multiple vertical back ribs (4) are fixedly connected to the four side mold back ribs (3) at intervals. The vertical back ribs (4) are fixedly connected to the upper end with diagonal braces (5) and the lower end abuts against one end of the horizontal support (6). The other end of the horizontal support (6) abuts against the steel anchor (8). The steel anchor (8) is inserted into the pad layer (10). The other end of the diagonal brace (5) abuts against the valve plate steel bar (9) perpendicular to it.

2. The standardized clamp-type side formwork structure for post-cast strips in raft foundations according to claim 1, characterized in that, Vertical back bracing (4) and steel ground anchor (8) are installed every 80-100cm.

3. A standardized clamp-type side formwork structure for post-cast strips in raft foundations according to claim 2, characterized in that, Both the lower fixed fixture side mold (1) and the upper fixed fixture side mold (2) are composed of multiple templates, and the side mold back rib (3) is composed of multiple wooden blocks, with each wooden block fixedly connecting two adjacent templates.

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