Precast concrete heat preservation formwork for dam body pouring

Abstract

The utility model discloses a precast concrete heat preservation formwork for dam body pouring, which belongs to the technical field of heat preservation formworks, and each formwork unit is rectangular and comprises a panel, a support grid and a heat preservation structure, the supporting grid is arranged on the inner side face of the panel and comprises dense rib beams which are arranged in a staggered mode. The heat preservation structure makes contact with the dam body and comprises a heat preservation plate and a heat preservation layer. The heat preservation plate is arranged in the supporting grid in a filling mode and fixedly connected with the inner side face of the face plate, and the heat preservation plate and the supporting grid jointly cover the inner side face of the face plate; the outer side face of the dense rib beam is coated with the heat preservation layer. According to the utility model, the traditional integrated insulation board is divided into a plurality of small blocks which are further positioned through the supporting grids, so that the connection strength between the insulation board and the panel can be enhanced, and the stripping risk between the insulation board and the panel is reduced; the supporting grid is provided with the force-bearing protruding blocks, the force-bearing protruding blocks can be embedded into the dam body to balance the gravity of the force-bearing protruding blocks, a self-stabilizing body is formed, and the falling risk caused by the gravity of the structure can be reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of thermal insulation templates, and in particular relates to a prefabricated concrete thermal insulation template used for dam body casting. Background Art

[0002] The non-dismantling insulation formwork has the advantages of high construction efficiency, good insulation effect, energy saving and environmental protection, improved wall bearing capacity, and reduced noise. In the field of construction, the application of non-dismantling insulation formwork helps to improve project quality, reduce costs, shorten construction period, and meet environmental protection and energy-saving requirements. It is especially suitable for extreme environments such as severe cold climate, large temperature difference between day and night, or frequent temperature drops. It can avoid the problem of large temperature difference between the inside and outside of concrete structures during the concrete pouring period without temporary insulation or the intermittent period of permanent insulation after the temporary insulation is removed. It has high promotion and application value.

[0003] During the operation period of the dam, the climatic conditions in the cold region are severe. Affected by factors such as large temperature differences, strong winds, strong sunshine, and water blisters, water level changes, ice push and ice pull after the reservoir is filled with water, since general permanent insulation materials are low-strength materials with weak ability to resist external forces, the traditional dam body permanent insulation layer often partially or completely peels off after a few years of operation, resulting in failure of the insulation layer, making it difficult to achieve the original design of permanent insulation.

[0004] Patent document CN113550269A provides a non-disassembly insulation formwork component for use in extremely cold areas, but its insulation layer is connected to the panel and the dam body by the bonding force between the insulation layer and the concrete and the connecting ribs. The surface of the insulation layer is relatively smooth, and the bonding force with the concrete is relatively low. The connecting ribs can only achieve point connection between the insulation layer and the panel and the dam body. Under the dual effects of extreme environment and water force, it is difficult to meet the overall connection strength requirements by relying on bonding force and point connection. The insulation layer is easily peeled off from the panel and the dam body, affecting the insulation effect; and when the insulation layer at the position of the connecting ribs is subjected to large local force, the insulation layer is prone to structural damage, and at the same time the connection at this point fails, affecting the insulation effect of the entire formwork. Utility Model Content

[0005] The purpose of the utility model is to provide a precast concrete insulation formwork for dam body casting, so as to solve the problem in the above-mentioned background technology that the insulation layer in the insulation formwork and the precast concrete are easily delaminated, there is a risk of peeling off from the dam body, and the insulation effect is affected.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A precast concrete insulation formwork for dam body casting is assembled from interconnected formwork units, wherein the formwork units are rectangular and include a panel, a support grid and an insulation structure; the support grid is arranged on the inner side of the panel and includes staggered dense-rib beams; the insulation structure is in contact with the dam body and includes an insulation board and an insulation layer; the insulation board is filled in the support grid and fixedly connected to the inner side of the panel, and the insulation board and the support grid together cover the inner side of the panel; the insulation layer is coated on the surface of the dense-rib beam.

[0008] Furthermore, it also includes load-bearing protrusions, which are arranged at the intersection positions of the support grids.

[0009] Furthermore, the thermal insulation structure also includes a thermal insulation block; the thermal insulation block is arranged on the surface of the load-bearing protrusion.

[0010] Furthermore, the size and shape of the support grid are the same as those of the panel, including rectangular grids arranged at intervals; the dense-ribbed beams are arranged in a criss-cross pattern; the dense-ribbed beams are divided into peripheral dense-ribbed beams and middle dense-ribbed beams according to their setting positions; the edges of the peripheral dense-ribbed beams are flush with the edges of the panel.

[0011] Furthermore, a first embedded part is arranged inside the load-bearing protrusion, and the first embedded part is connected to the structural foundation of the dam body through tie bars.

[0012] Furthermore, a support frame is set up outside the panel; a second embedded part is set on the panel corresponding to the load-bearing protrusion, and the second embedded part is connected to the support frame through a connecting rod.

[0013] Furthermore, the outer side surface of the insulation board is flush with the outer side surface of the multi-rib beam and is made of XPS insulation material; the insulation layer is sprayed with a flexible insulation material; and the insulation block is made of a rigid insulation material.

[0014] Furthermore, a reserved channel is provided on the peripheral multi-rib beam, and connecting bolts are arranged in the reserved channel, and adjacent template units are connected by the connecting bolts.

[0015] Furthermore, each set of opposite sides of the panel is respectively provided with grooves and tenons that cooperate with each other.

[0016] The utility model has the following beneficial effects:

[0017] The utility model provides a prefabricated concrete insulation formwork for dam body casting, which replaces the traditional insulation layer construction process of integrally pasting or spraying after the main dam body structure is completed, with the insulation material being prefabricated in the factory together with the concrete formwork that does not need to be dismantled, and has strong quality controllability. It can also be constructed in parallel with the dam body to improve construction efficiency.

[0018] The utility model provides a precast concrete insulation formwork for dam body casting, which splits a traditional integrated insulation board into multiple small blocks and further positions them by embedding them in a supporting grid, thereby enhancing the connection strength between the insulation board and the panel and reducing the risk of peeling between the two.

[0019] The utility model provides a precast concrete thermal insulation formwork for dam body casting, in which load-bearing protrusions are arranged on the supporting grid on the inner side of the panel, and the load-bearing protrusions can be embedded in the dam body concrete poured later, and the shear resistance of the protrusions can balance their own gravity. Each single thermal insulation formwork forms a self-stabilizing body with the dam body, which can reduce the risk of falling off due to structural gravity when used for super-high prefabricated assembled arch dams. The dam body is tightly connected to the supporting grid and the panel through the load-bearing protrusions, thereby increasing the connection strength between the formwork and the dam body and improving the durability of the thermal insulation board.

[0020] The utility model provides a precast concrete insulation formwork for dam body casting, in which the insulation blocks at the load-bearing protrusions are made of rigid insulation materials, and force is passed through the fulcrums to ensure that the insulation materials are not subjected to force, thereby reducing the risk of insulation structure damage.

[0021] The utility model provides a precast concrete insulation formwork for dam body casting, wherein a support frame is arranged on the outer side of the formwork to assist in positioning and installation, thereby decomposing the stress on the inner reinforcement caused by the inner and outer inclinations of the formwork, reducing the number of tie bars embedded in the dam body and reducing the construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of assembling the template unit involved in the utility model;

[0023] Figure 2 It is a structural schematic diagram of the template unit involved in the utility model;

[0024] Figure 3 A diagram showing the connection relationship between the support grid and the panel involved in the utility model;

[0025] Figure 4 The utility model is a schematic diagram of the layout of the tie bars involved.

[0026] In the figure: 1-panel, 2-support grid, 21-peripheral dense-rib beam, 22-middle dense-rib beam, 3-load-bearing protrusion, 4-insulation structure, 41-insulation board, 5-tie reinforcement, 6-connecting bolts. Implementation

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] like Figure 1-3 As shown, the utility model provides a precast concrete insulation formwork for dam body casting, which is assembled from interconnected formwork units, and the formwork units include a panel 1, a support grid 2, a load-bearing protrusion 3 and an insulation structure 4; the panel 1 is vertically arranged, and its side close to the dam body is the inner side, and the side away from the dam body is the outer side; the support grid 2 is arranged on the inner side of the panel 1, including staggered dense-rib beams; the load-bearing protrusions 3 are arranged at intervals on the outer side of the dense-rib beams; the insulation structure 4 is in contact with the dam body, including an insulation board 41, an insulation layer and an insulation block, the insulation board 41 is filled in the support grid 2 and is fixedly connected to the inner side of the panel 1, and the insulation board 41 and the support grid 2 jointly cover the inner side of the panel 1; the insulation layer is coated on the surface of the dense-rib beam; the insulation block is arranged on the surface of the load-bearing protrusion 3, and the insulation board 41 and the insulation layer, and the insulation layer and the insulation block are connected to each other, thereby realizing a complete insulation protection function.

[0029] The bottom of the dam structure is the structural foundation, and anchor points are set on the structural foundation. The anchor points can be embedded bolts or embedded steel bars.

[0030] The panel 1, the support grid 2 and the load-bearing convex block 3 are all prefabricated reinforced concrete structures, and the three are connected by steel bars. A support frame is set up outside the panel 1. The adjacent template units are connected by mortise and tenon joints. A water stop structure is set between adjacent template units, and they are assembled by horizontal through seams and vertical staggered splicing.

[0031] The size and shape of the support grid 2 are the same as those of the panel 1. The multi-rib beams are divided into peripheral multi-rib beams 21 and middle multi-rib beams 22 according to the setting position. The edge of the peripheral multi-rib beam 21 is flush with the edge of the panel 1. The peripheral multi-rib beams 21 of the adjacent template units are provided with reserved channels, and connecting bolts 6 are provided in the reserved channels. The connection of the two template units is realized by the connecting bolts 6 to increase the connection strength.

[0032] The cross section of the peripheral multi-rib beam 21 is a right-angled trapezoid, and the side close to the outer edge is a right angle. The cross section of the middle multi-rib beam 22 is an isosceles trapezoid, thereby increasing the area of ​​the thermal insulation material and improving the thermal insulation effect; reducing the concrete mass and reducing the deadweight of the thermal insulation template.

[0033] The connecting bolt 6 can be set to a curved shape or a straight shape. The connecting bolt 6 is located on the rod body inside the multi-rib beam, and a hand hole spiral rib is symmetrically set, and a pad is set at both ends. The pad is located between the nut and the surface of the multi-rib beam to ensure the structural strength and connection reliability of the reserved channel. The insulation board 41 corresponds to the end opening of the connecting bolt 6 to provide an operating space for the fixation of the connecting bolt 6. After the connecting bolt 6 is installed, a flexible insulation material is sprayed on the reserved opening. The number and diameter of the connecting bolt 6 are determined according to the force calculation. Preferably, two adjacent insulation templates are connected by three connecting bolts 6, and the diameter of the connecting bolt 6 is 16mm-40mm.

[0034] like Figure 4 As shown, a first embedded part is arranged inside the load-bearing protrusion 3, and the first embedded part is connected to the structural foundation of the dam body through the tie bar 5, so as to enhance the connection strength between the thermal insulation formwork and the dam body and avoid delamination or peeling. One end of the tie bar 5 is connected to the first embedded part, and the other end is connected to the structural foundation of the dam body. A second embedded part is arranged on the panel 1 corresponding to the load-bearing protrusion 3, and the second embedded part is connected to the support frame through a connecting rod, so as to ensure the stability of the thermal insulation formwork during the pouring process. Preferably, the first embedded part and the second embedded part are both embedded sleeves. The outer end of the second embedded part extends out of the panel 1, and a connecting ear plate is fixedly provided, and the connecting ear plate is connected to the connecting rod.

[0035] The heat preservation block is set as a cover structure, and its shape is adapted to the shape of the load-bearing protrusion 3. A threaded sleeve is set at the position corresponding to the first embedded part on the heat preservation block; a screw is fixed at the end of the tie rib 5, and the screw is threadedly connected with the threaded sleeve and the first embedded part respectively, thereby realizing the connection between the heat preservation block and the load-bearing protrusion 3, and the tie rib 5 and the load-bearing protrusion 3.

[0036] The outer side of the insulation board 41 is flush with the outer side of the multi-rib beam, and can be a prefabricated board or a layer formed by spraying. The insulation board 41 is preferably an XPS insulation material, i.e., an extruded polystyrene insulation board, which is a fully enclosed foaming chemical structure and a honeycomb physical structure, and has the characteristics of being light and high-strength, easy to cut and transport, not easily damaged, and easy to install. The insulation layer is sprayed with a flexible insulation material, and the flexible insulation material can be a foamed polyurethane, which has strong plasticity. The insulation block is preferably a rigid insulation material, such as an extruded polystyrene insulation board.

[0037] The insulation board 41, the insulation layer and the insulation block are connected to each other to ensure that the entire side is completely covered by the insulation structure. The insulation board 41 is attached to the panel 1 and further fixed by insulation nails, which are pre-buried in the panel 1 and whose other ends are arranged in the insulation board 41.

[0038] The template unit is rectangular as a whole. The top and bottom surfaces of the panel 1 are respectively provided with grooves and tenons that match each other, and the front and back of the panel 1 are similarly provided to achieve the mortise and tenon connection between adjacent template units. The support grid 2 includes a plurality of rectangular grids arranged at intervals, and the ribbed beams are arranged crisscross, and the ribbed beams in the same direction are equidistantly distributed. The load-bearing protrusions 3 are arranged at the intersection of the support grid 2. The corresponding rectangular grid of the insulation board 41 is set to be rectangular.

[0039] A construction method of a precast concrete insulation formwork for dam body pouring specifically comprises the following steps:

[0040] Step 1: prefabricate the template unit in the factory, transport it to the construction site after it is manufactured, and fix the insulation block on the load-bearing protrusion 3 by screws;

[0041] Step 2: Divide the casting positions into multiple positions according to the casting height, first assemble the template units of the bottom casting positions, and assemble the template units by horizontal through seams and vertical staggered splicing;

[0042] Step 3: Lift the formwork unit to the casting position, first assemble the formwork unit at the bottom of the casting position, and use the grooves and tenons to achieve the initial positioning and splicing of the formwork unit;

[0043] Step 4: Install the tie bar 5, and connect the two ends of the tie bar 5 to the screw rod and the structural foundation of the dam body respectively;

[0044] Step 5: Set up a support frame outside the assembled formwork unit, and connect the support frame to the second embedded part through a connecting rod;

[0045] Step 6: Install the connecting bolts 6 between adjacent template units;

[0046] Step 7: Use the crane and jacking device to adjust the position of the formwork unit to ensure the joint size accuracy and angle requirements, and then tighten the connecting bolts 6, tie bars 5 and connecting rods;

[0047] Step 8: Install the remaining formwork units in sequence from bottom to top until the formwork units of the entire casting position are assembled;

[0048] Step 9: Cast the dam body. After casting, cover with concrete for maintenance.

[0049] Step 10: After the dam body reaches the designed strength, repeat steps 3 to 9 to carry out the construction of the next pouring bin until the construction of all pouring bins is completed.

[0050] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A precast concrete insulation formwork for dam casting, characterized in that: The dam is assembled from interconnected template units, the template units are rectangular and include a panel (1), a support grid (2) and a thermal insulation structure (4); the support grid (2) is arranged on the inner side of the panel (1) and includes staggered dense-rib beams; the thermal insulation structure (4) is in contact with the dam body and includes a thermal insulation board (41) and a thermal insulation layer; the thermal insulation board (41) is filled in the support grid (2) and is fixedly connected to the inner side of the panel (1); the thermal insulation board (41) and the support grid (2) together cover the inner side of the panel (1); and the thermal insulation layer is coated on the surface of the dense-rib beam.

2. The precast concrete insulation formwork for dam casting according to claim 1 is characterized in that: It also comprises a load-bearing protrusion (3), wherein the load-bearing protrusion (3) is arranged at the intersection position of the support grid (2).

3. The precast concrete insulation formwork for dam casting according to claim 2 is characterized in that: The thermal insulation structure (4) also includes a thermal insulation block; the thermal insulation block is arranged on the surface of the load-bearing protrusion (3).

4. The precast concrete insulation formwork for dam casting according to claim 1 is characterized in that: The size and shape of the support grid (2) are the same as those of the panel (1), and include rectangular grids arranged at intervals; the dense rib beams are arranged in a crisscross pattern; the dense rib beams are divided into peripheral dense rib beams (21) and middle dense rib beams (22) according to their arrangement positions; and the edges of the peripheral dense rib beams (21) are flush with the edges of the panel (1).

5. The precast concrete insulation formwork for dam casting according to claim 2 is characterized in that: A first embedded part is arranged inside the load-bearing protrusion (3), and the first embedded part is connected to the structural foundation of the dam body through a tie bar (5).

6. The precast concrete insulation formwork for dam casting according to claim 2 is characterized in that: A support frame is set up outside the panel (1); a second embedded part is arranged on the panel (1) corresponding to the load-bearing protrusion (3), and the second embedded part is connected to the support frame via a connecting rod.

7. The precast concrete insulation formwork for dam casting according to claim 3 is characterized in that: The outer side surface of the insulation board (41) is flush with the outer side surface of the multi-rib beam and is made of XPS insulation material; the insulation layer is sprayed with a flexible insulation material; and the insulation block is made of a rigid insulation material.

8. The precast concrete insulation formwork for dam casting according to claim 4 is characterized in that: A reserved channel is provided on the peripheral multi-rib beam (21), and a connecting bolt (6) is arranged in the reserved channel, and adjacent template units are connected via the connecting bolt (6).

9. The precast concrete insulation formwork for dam casting according to claim 1, characterized in that: Each set of opposite sides of the panel (1) is provided with grooves and tenons that fit together.

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