Concentric circle filling device and application method in mass concrete crack control

Abstract

The invention provides a concentric circle filling device and an application method in mass concrete crack control, and belongs to the technical field of hydraulic structures. The concentric circle filling device comprises a pipe body structure, the pipe body structure comprises an outer pipe body and an inner pipe body, the outer pipe body and the inner pipe body are coaxially arranged in a sleeved mode, and an annular area between the outer wall of the inner pipe body and the inner wall of the outer pipe body serves as a first storage space; an inner cavity of the inner tube body serves as a second storage space; the inner tube body is sleeved with an inflatable annular air bag, and when the annular air bag is not inflated, the annular air bag can slide up and down along the inner tube body; after the annular air bag is inflated, one end of the first storage space can be completely sealed and plugged; an air bag ball is arranged in the inner tube body, and after the air bag ball is inflated, one end of the second storage space can be completely sealed and plugged. The method is implemented based on the concentric circle filling device and is applied to mass concrete crack control. Cracks generated by the gate pier can be effectively controlled, and meanwhile the integrity of the structure is improved.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic structures, in particular to a concentric circle filling device and an application method thereof in controlling cracks in large-volume concrete. Background Art

[0002] The sluice gate is composed of the sluice bottom plate and the piers, and is a large-volume concrete structure of hydraulic engineering. Due to the large volume and complex structure of large-volume concrete, and the fact that concrete is a poor conductor of heat, the heat of cement hydration accumulates inside the structure and is difficult to diffuse. If this heat control problem is not solved well, it is easy to cause cracks in the large-volume concrete.

[0003] In response to this problem, some solutions have emerged in the prior art, such as using low-heat or medium-heat cement during the construction of the gate pier and arranging cold water pipes for water cooling during the pouring process. However, the use of low-heat or medium-heat cement has the problem of high cost and uneconomical; the use of cooling water technology can indeed play a positive role in controlling the cracks in the gate pier concrete, but because the internal temperature of the concrete is high and the temperature of the cooling water pipe is low, the temperature difference between the two is large, resulting in a large temperature gradient. The temperature of the concrete near the water pipe is greatly affected by the change in the cooling water temperature. The large temperature difference between the internal concrete and the pipe wall causes the concrete at the pipe wall to crack early, which will produce several small cracks. The location of the small cracks becomes a weak point. The gate pier will not have problems during the early operation period, but in the later service, under the influence of multiple factors such as the internal stress of the gate pier concrete and the change of ambient temperature during the operation period, the concrete will deform. These small cracks will induce large cracks, destroying the integrity, stability, durability and waterproofness of the structure, affecting normal use. In addition, the cooling water pipe inside the gate pier cannot be pulled out and will be permanently embedded in the gate pier concrete, causing a cavity inside the gate pier, which will affect the integrity of the overall structure, reduce the overall strength of the gate pier, and affect the durability and safety of the sluice gate.

[0004] It can be seen that whether it is low-heat or medium-heat cement or cooling water cooling, there are still some disadvantages. After relevant research, the inventor found that filling stress-absorbing materials in concrete can effectively control the cracks of large-volume concrete structures of hydraulic structures, especially after filling stress-absorbing materials with strain gradients, the effect is more significant. The inventor mentioned this in the patent previously applied for (application number 202510179851.5, named a structure capable of controlling cracks in large-volume sluices and its construction method). Because of its certain construction difficulty, no suitable construction equipment and feasible construction methods were developed at that time. For this reason, the inventor has devoted himself to research during this period of time, and this case came into being. Summary of the invention

[0005] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the present invention proposes a concentric circle filling device and an application method in controlling cracks in large concrete volumes.

[0006] The technical solution of the present invention to solve the technical problem is: In a first aspect, the technical solution proposes a concentric circle filling device, including a tube structure, wherein the tube structure includes a hollow outer tube and an inner tube, wherein the outer tube and the inner tube are coaxially sleeved, wherein an oblique tie rod is connected between the top of the outer tube and the outer wall of the inner tube, wherein the annular area between the outer wall of the inner tube and the inner wall of the outer tube serves as a first storage space; and the internal cavity of the inner tube serves as a second storage space; An inflatable annular airbag is sleeved on the inner tube body, and when the annular airbag is not inflated, the annular airbag can slide up and down along the inner tube body; when the annular airbag is inflated, one end of the first storage space can be completely sealed; an airbag ball is arranged in the inner tube body, and when the airbag ball is inflated, one end of the second storage space can be completely sealed.

[0007] Preferably, the bottom end of the inner tube body is flush with the bottom end of the outer tube body, and the top end of the inner tube body is not lower than the top end of the outer tube body.

[0008] Preferably, the annular airbag is connected to a first inflation tube; the first inflation tube passes through the top of the first storage space and extends to above the outer tube body; the airbag ball is connected to a second inflation tube, and the second inflation tube passes through the top of the second storage space and extends to above the inner tube body.

[0009] Preferably, corresponding grooves are respectively formed on the bottom tube walls of the inner tube body and the outer tube body.

[0010] Preferably, it further comprises a bottom support unit, which is arranged at the bottom of the tube structure; the bottom support unit can be adapted to be engaged with the card slot.

[0011] Preferably, the bottom support unit is a cross-shaped structure formed by welding two support steel bars.

[0012] Preferably, it further comprises a top support unit, wherein the top support unit comprises a connecting member and a pressing member, wherein: The connector comprises a pressing sleeve, a positioning sleeve is connected to the top of the pressing sleeve, an annular partition is arranged inside the pressing sleeve, and the annular partition is fixedly connected to the inner wall of the pressing sleeve; a bayonet is formed at the bottom of the pressing sleeve, and the bayonet is adapted to be snap-fitted with the top of the inner tube body; The pressing member comprises a cross brace, the cross brace is threadedly connected with a threaded rod, the bottom of the threaded rod is adapted to be plugged with the positioning sleeve; and a hole is provided on the side wall of the pressing sleeve.

[0013] In the second aspect, the technical solution also proposes an application method of the concentric circle filling device in the control of cracks in large-volume concrete, which is applied to the control of cracks in water gates, and includes the following steps: S1: Construction preparation; S2: foundation treatment; S3: construction of the gate bottom plate; S4: Pier construction: S41: Construction layout; S42: Pier reinforcement binding and installation; S43: erecting the pier body formwork above the gate bottom plate; S44: Install multiple concentric circle filling devices at the designed position; S45: Slide the annular airbag and the airbag ball downward along the inner tube body to be located at the bottom of the inner tube body; inflate the annular airbag and the airbag ball respectively using an inflation device until the annular airbag completely seals the bottom end of the first storage space and the airbag ball completely seals the bottom end of the second storage space to isolate the concrete; S46: pouring concrete, vibrating and curing to construct the pier body; S47: After the concrete of the pier body is initially set, the annular airbag is deflated, the annular airbag is pulled to the top of the inner tube body and temporarily tied and fixed with ropes to temporarily position the annular airbag; the airbag ball is deflated, and the airbag ball is pulled out of the inner tube body after deflation; S48: Fill the first storage space and the second storage space with stress absorbing materials with different strains respectively; lift up the concentric circle filling device to form a cavity; while lifting up, two stress absorbing materials with different strains fall into the cavity at the same time to fill the cavity, so as to achieve filling while pulling out the tube and construct a concentric circle strain gradient structure.

[0014] Preferably, the specific construction method of the concentric circle filling device in S44 is: S44-1, install the bottom support unit: place the bottom support unit at the designed position, tie and connect the bottom support unit with the pier body reinforcement, and construct the lower limit foundation; S44-2, installing the concentric circle filling device: pressing the concentric circle filling device onto the bottom support unit, and making the clamping groove at the bottom of the tube structure clamped with the bottom support unit; S44-3, installing the connector: installing the connector sleeve on the top of the inner tube body; S44-4, install the pressing piece: place the cross brace on top of the connecting piece, temporarily tie and fix the cross brace and the pier body reinforcement; screw the threaded rod, move the threaded rod downward and hold it in the positioning sleeve on the top of the connecting piece, the pressing piece and the connecting piece cooperate to construct an upper limiting foundation, and the upper limiting foundation and the lower limiting foundation fix the concentric circle filling device.

[0015] Preferably, the stress absorbing material includes but is not limited to rubber concrete, acrylic concrete, acrylic rubber concrete, rubber mortar, acrylic rubber mortar.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention constructs concentric circular cavities in concrete through a concentric circular filling device, and uses the concentric circular filling device to fill two stress absorbing materials with different strains into the concrete. This has the following advantages: first, the stress generated inside the gate pier can be effectively absorbed by the stress absorbing material, ensuring that the maximum stress in the gate pier is less than the ultimate tensile strength of the gate pier concrete, thereby effectively controlling the generation of cracks in the gate pier; second, a certain strain gradient is also formed, which is conducive to avoiding stress concentration at the interface between the stress absorbing material and the surrounding concrete, while improving the integrity of the structure.

[0017] 2. In the construction method of the present invention, a concentric circle filling device is used and a construction process of filling while drilling is adopted, which can ensure that the filled stress absorbing material forms a complete whole with the surrounding concrete, can effectively control the cracks in the gate pier, ensure the construction quality, and improve the durability and safety of the project.

[0018] 3. The concentric circle filling device has a simple overall structure, is easy to manufacture, and has low cost. It is convenient to construct, and uses annular airbags and airbag balls to achieve blocking, which is convenient for workers to operate and has high practicality. In addition, the concentric circle filling device is also equipped with a bottom support unit and a top support unit, which can ensure the positioning and installation of the pipe structure, ensure that the filling body will not shift when the vibrating rod vibrates the concrete, ensure the position accuracy, and avoid the subsequent difficulties in pulling out the pipe caused by the displacement and tilting during vibration.

[0019] 4. In the concentric circle filling device, the inner tube body and the outer tube body are connected in a unilateral fixed manner. Although this method is conducive to the up and down sliding of the annular airbag, it also has the disadvantage of being not stable enough. In the present invention, a bottom support unit is designed, and a card slot is provided at the bottom end of the tube structure. The card slot and the bottom support unit are used to support and position the tube structure, thereby ensuring the coaxiality between the inner tube body and the outer tube body, and facilitating the construction of a concentric circle strain gradient structure. In addition, the bottom support unit can also play a certain limiting role on the annular airbag and the airbag ball to prevent them from detaching from the tube structure, which is convenient for workers to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0021] Figure 1It is a front view of the concentric circle filling device in Example 1.

[0022] Figure 2 yes Figure 1 Cross-sectional view of the concentric circle filling device.

[0023] Figure 3 yes Figure 1 Top view of the mid-tube structure.

[0024] Figure 4 yes Figure 2 Structural top view of the middle annular airbag.

[0025] Figure 5 It is a front view of the concentric circle filling device in the second embodiment.

[0026] Figure 6 It is a structural stereogram of the bottom support unit.

[0027] Figure 7 It is a three-dimensional diagram of the outer tube structure in the second embodiment.

[0028] Figure 8 It is a bottom view of the tube structure in the second embodiment.

[0029] Fig. 9 yes Figure 5 Enlarged view of the structure of the middle top support unit.

[0030] Fig.10 It is a structural stereogram of the connecting parts.

[0031] Fig.11 This is the main view of the sluice structure.

[0032] Fig.12 This is an example of a structural cross-sectional view of a strain gradient structure in a sluice gate.

[0033] Fig.13 This is the second example of the structural cross-sectional view of the strain gradient structure in the sluice.

[0034] Fig.14 This is example three of the structural cross-sectional view of the strain gradient structure in the sluice.

[0035] Fig.15 This is example 4 of the structural cross-sectional view of the strain gradient structure in the sluice.

[0036] Fig.16 is a top view of the strain gradient structure.

[0037] Fig.17 This is a bird's-eye view of the layout of the strain gradient structure in the gate pier. Figure 1 .

[0038] Fig.18This is a bird's-eye view of the layout of the strain gradient structure in the gate pier. Figure 2 .

[0039] Fig.19 This is a bird's-eye view of the layout of the strain gradient structure in the gate pier. Figure 3 .

[0040] Fig. 20 It is a process flow chart when filling stress absorbing material using a concentric circle filling device.

[0041] in: Fig. 20 (a) is a schematic diagram of the structure when the concentric circle filling device and the pier body reinforcement are positioned and installed.

[0042] Fig. 20 (b) is a schematic diagram of the structure when the gate pier concrete is poured in layers.

[0043] Fig. 20 (c) is a schematic diagram of the structure after the gate pier concrete is poured in layers and the top support unit is removed.

[0044] Fig. 20 (d) is a schematic diagram of the structure when the tube is lifted on the concentric circle device.

[0045] Fig.21 It is a cross-sectional view of the structure filled with stress absorbing material when the tube is lifted on the concentric circle device.

[0046] Description of the markings in the figure: 1. Outer tube body; 2. Inner tube body; 3. Diagonal tie rod; 4. Annular airbag; 5. Airbag ball; 6. Slot; 7. First inflation tube; 8. Second inflation tube; 9. Support steel bar; 10. Gate bottom plate; 11. Gate pier; 12. Pier body steel bar; 13. Strain gradient structure; 131. First stress absorbing material; 132. Second stress absorbing material; 14. Bottom plate steel bar; w1 bottom support unit; w2. Connector; w21. Pressing sleeve; w211. Opening; w22. Positioning sleeve; w23. Annular partition; w24. Clamp; w3. Pressing piece; w31. Cross brace; w32. Threaded rod. DETAILED DESCRIPTION

[0047] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0048] In the description of the present invention, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0049] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0050] Embodiment 1: like Figure 1 - Figure 4 As shown, this embodiment proposes a concentric circle filling device, including a tube structure, which includes a hollow outer tube body 1 and an inner tube body 2. The outer tube body 1 and the inner tube body 2 are coaxially sleeved to form a concentric circle structure. An inclined rod 3 is connected between the top of the outer tube body 1 and the outer wall of the inner tube body 2. The inclined rod 3 plays a fixed support role. The connection point between the inclined rod 3 and the inner tube body 2 can be set at a position close to the top of the inner tube body 2. The annular area between the outer wall of the inner tube body 2 and the inner wall of the outer tube body 1 serves as the first storage space; the internal cavity of the inner tube body 2 serves as the second storage space. The first storage space and the second storage space are respectively used to store stress absorbing materials. The specific usage is detailed below.

[0051] The inner tube body 2 is provided with an inflatable annular airbag 4. When the annular airbag 4 is not inflated, the annular airbag 4 can slide up and down along the inner tube body 2. When the annular airbag 4 is inflated, one end of the first storage space can be completely sealed and blocked. Since the outer tube body 1 and the inner tube body 2 are fixed by a single side or a single end, the area below the connection point of the inner tube body 2 acts as a sliding guide rod. When the annular airbag 4 is sleeved on the inner tube body 2, the annular airbag 4 can slide up and down. When the annular airbag 4 is inflated, the annular airbag 4 bulges and plays a blocking role in the first storage space, preventing concrete from entering the first storage space when pouring concrete.

[0052] An airbag ball 5 is arranged in the inner tube body 2. The airbag ball 5 is an inflatable structure. When the airbag ball 5 is inflated, it can completely seal one end of the second storage space and prevent concrete from entering the inner tube body 2 when pouring concrete.

[0053] In some embodiments, the bottom end of the inner tube 2 is flush with the bottom end of the outer tube 1, and the top end of the inner tube 2 is not lower than the top end of the outer tube 1. The top end of the inner tube 2 is higher than the top end of the outer tube 1, one is to facilitate connection with the outer tube 1, and the other is to facilitate lifting.

[0054] In order to facilitate inflation and deflation, in some embodiments, the annular airbag 4 is connected to a first inflation tube 7; the first inflation tube 7 passes through the top of the first storage space and extends to the top of the outer tube body 1; the airbag ball 5 is connected to a second inflation tube 8, which passes through the top of the second storage space and extends to the top of the inner tube body 2. In this embodiment, two first inflation tubes 7 can be provided, and these two first inflation tubes 7 not only play an inflation role, but can also be used as hanging ropes. Whether it is to adjust the position of the annular airbag 4 or to lift the annular airbag 4, using two first inflation tubes 7 can facilitate operation.

[0055] Embodiment 2: like Figure 5 - Fig.10 As shown, based on the first embodiment, the concentric circle filling device proposed in this embodiment also has the following structure: The bottom tube walls of the inner tube body 2 and the outer tube body 1 are respectively provided with corresponding clamping grooves 6, and the clamping grooves 6 can be a straight-line structure or a cross-shaped structure. In this embodiment, the clamping grooves 6 are of a cross-shaped structure.

[0056] The entire device further comprises a bottom support unit w1 , which is arranged at the bottom of the tubular structure; the bottom support unit w1 can be adapted and engaged with the card slot 6 .

[0057] In this embodiment, the bottom support unit w1 is a cross-shaped structure formed by welding two support steel bars 9 , and can be adapted to be engaged with the cross-shaped slot 6 .

[0058] The whole device also includes a top support unit, which includes a connecting member w2 and a pressing member w3, wherein: The connecting piece w2 includes a pressing sleeve w21, the top of which is connected to a positioning sleeve w22, and the pressing sleeve w21 and the positioning sleeve w22 form a stepped shaft structure; an annular partition w23 is provided inside the pressing sleeve w21, and the annular partition w23 is fixedly connected to the inner wall of the pressing sleeve w21; a bayonet w24 is formed at the bottom of the pressing sleeve w21, and the bayonet w24 is adapted to be snap-fitted to the top of the inner tube body 2.

[0059] The lower pressing piece w3 includes a cross brace w31, which is threadedly connected to a threaded rod w32, and the bottom of the threaded rod w32 is adapted to be plugged into the positioning sleeve w22; a hole w211 is formed on the side wall of the pressing sleeve w21, and the hole w211 is used for the second inflation tube 8 to pass through.

[0060] Technical effect: The concentric circle filling device has a simple overall structure, is easy to manufacture, low cost, and convenient to construct. It uses an annular airbag 4 and an airbag ball 5 to achieve sealing, is easy for workers to operate, and has high practicality. In addition, the concentric circle filling device is also configured with a bottom support unit w1 and a top support unit, which can ensure the positioning and installation of the pipe body structure, ensure that the filling body will not shift when the vibrating rod vibrates the concrete, ensure the position accuracy, and avoid the subsequent difficulties in pulling out the pipe caused by the displacement and tilting during vibration.

[0061] In the concentric circle filling device, the inner tube body 2 and the outer tube body 1 are connected in a unilateral fixed manner. Although this method is conducive to the up and down sliding of the annular airbag 4, it also has the disadvantage of being not stable enough. In the present invention, a bottom support unit w1 is designed, and a card slot 6 is arranged at the bottom end of the tube structure. The card arrangement between the card slot 6 and the bottom support unit w1 can play a dual role of supporting and positioning the tube structure, ensuring the coaxiality between the inner tube body 2 and the outer tube body 1, which is conducive to constructing a concentric circle strain gradient structure 13; in addition, the bottom support unit w1 can also play a certain limiting role on the annular airbag 4 and the airbag ball 5 to prevent them from detaching from the tube structure, which is convenient for workers to operate.

[0062] Embodiment three: like Figure 11-Figure 21 As shown, this embodiment also proposes an application method of the concentric circle filling device in controlling cracks in large concrete volumes, which is applied to controlling cracks in water gates, and includes the following steps: S1: Construction preparation: prepare construction plan, determine construction materials and equipment, personnel training, etc.

[0063] S2: Foundation treatment: Before the construction of the gate bottom plate 10 and the gate pier 11, the foundation needs to be treated to ensure the bearing capacity and stability of the foundation.

[0064] S3: Construction of the gate bottom plate 10: binding and installation of the bottom plate reinforcement 14 ----- supporting the gate bottom plate 10 formwork ----- concrete pouring ----- forming of the gate bottom plate 10.

[0065] Among them: S31. Binding of bottom plate reinforcement 14: Bind the reinforcement according to the design drawings to ensure that the spacing and anchorage length of the reinforcement meet the specifications. S32. Support the gate bottom plate 10 formwork: Select a suitable formwork and install the formwork support system according to the design drawings to ensure the stability of the formwork. S33. Concrete pouring: Use the layered pouring method, and pay attention to vibrating and compacting during the pouring process. S34. Concrete curing: After pouring, carry out concrete curing in time to ensure the strength of the concrete, and finally remove the formwork to obtain the formed gate bottom plate 10.

[0066] S4: Construction of pier 11: The specific construction steps are as follows: S41: Construction layout; S42: Binding and installation of pier body reinforcement 12; S43: erecting a pier body formwork above the gate bottom plate 10; S44: Install multiple concentric circle filling devices at the designed position; the concentric circle devices should be temporarily fixed to ensure that the tube can be removed later; S45: The annular airbag 4 and the airbag ball 5 are respectively slid downward along the inner tube body 2 to be located at the bottom of the inner tube body 2; the annular airbag 4 and the airbag ball 5 are respectively inflated by an inflation device until the annular airbag 4 completely seals the bottom end of the first storage space and the airbag ball 5 completely seals the bottom end of the second storage space, so as to isolate the concrete; S46: pouring concrete, vibrating and curing to construct the pier body; S47: After the concrete of the pier body is initially set, the annular airbag 4 is deflated, the annular airbag 4 is pulled to the top of the inner tube body 2 and temporarily tied and fixed with a rope to temporarily position the annular airbag 4; the airbag ball 5 is deflated, and the airbag ball 5 is pulled out of the inner tube body 2 after deflation; S48: Fill the first storage space and the second storage space with stress absorbing materials with different strains respectively; lift up the concentric circle filling device to form a cavity; while lifting up, two stress absorbing materials with different strains fall into the cavity at the same time to fill the cavity, so as to achieve filling while pulling out the tube, and construct a concentric circle strain gradient structure 13.

[0067] It should be noted that the specific construction method of the concentric circle filling device in S44 in this embodiment is: S44-1, install the bottom support unit w1: place the bottom support unit w1 at the designed position, and tie and connect the bottom support unit w1 to the pier body steel bars 12 to construct the lower limit foundation; S44-2, installing the concentric circle filling device: pressing the concentric circle filling device onto the bottom support unit w1, and making the clamping groove 6 at the bottom of the tube structure clamped with the bottom support unit w1; S44-3, installing the connecting piece w2: sleeve-installing the connecting piece w2 on the top of the inner tube body 2; S44-4, install the pressing member w3: place the cross brace w31 above the connecting member w2, and temporarily tie and fix the cross brace w31 and the pier body steel bars 12; screw the threaded rod w32, and the threaded rod w32 moves downward and is pressed in the positioning sleeve w22 on the top of the connecting member w2. The pressing member w3 cooperates with the connecting member w2 to construct an upper limiting foundation, and the upper limiting foundation and the lower limiting foundation fix the concentric circle filling device.

[0068] It should be noted that when the pipe structure is lifted upward, the top support unit is disassembled and can be recycled; while the support members remain permanently in the pier body concrete and are integrated with the concrete.

[0069] In this embodiment, the stress absorbing material includes but is not limited to one or more of rubber concrete, acrylic concrete, acrylic rubber concrete, rubber mortar, acrylic mortar, and acrylic rubber mortar.

[0070] Taking rubber concrete as an example, the composition of rubber concrete includes: waste rubber powder, cement, fly ash, mineral powder, sand, gravel and water. The amount of waste rubber powder in concrete is 5-50kg / m 3 .

[0071] The production method of the rubber concrete can be carried out in the following steps: S1: Weigh cement, fly ash, mineral powder, sand, gravel and water according to weight, transport the obtained raw materials into a stirring device, stir them, and obtain a mixture A; S2: Determine the dosage of different rubber powders and rubber concrete in rubber concrete according to actual working conditions; S3: discharging the obtained mixture A from the inside of the stirring device, and sequentially conveying the obtained mixture A to the inside of multiple groups of metering barrels through the conveying device; S4: Add 5-50 kg / m3 of mixture A in multiple groups of metering barrels in sequence through the feeding device according to the concentration of the use position. 3 Waste rubber powder; S5: stirring the mixture with the corresponding amount of rubber powder again through a stirring device to make it fully mixed; S6: Complete the production of rubber concrete.

[0072] Taking acrylic rubber mortar as an example, acrylic rubber mortar is a mixture of rubber aggregate and acrylic mortar, which is composed of 40.0-60.0% of Portland cement; 20.0-30.0% of acrylic emulsion; 20.0-40.0% of rubber powder; 0-20.0% of sand; 0.3-1.2% of water reducer; and 5.0-10.0% of water in weight percentage, and the total of each component is 100%.

[0073] Taking acrylic emulsion mortar as an example, it is made up of 20.0-45.0% of Portland cement, 20-40.0% of acrylic emulsion, 20.0-60.0% of sand, 0-1.2% of water reducer and 5.0-15.0% of water in weight percentage, and the total of each component is 100%.

[0074] Application results of strain gradient structure 13: First, the stress absorbing material has good mechanical and deformation properties, and can effectively absorb the temperature deformation energy generated by the hydration of the concrete of the pier 11, release the temperature stress, reduce the stress constraint, and effectively control the cracks of the pier 11. The stress absorbing material is basically consistent with the strength of the surrounding concrete, and the stress absorbing material can effectively absorb the stress generated inside the pier 11, ensuring that the maximum stress in the pier 11 is less than the ultimate tensile strength of the concrete of the pier 11, thereby effectively controlling the cracks in the pier 11 and ensuring the construction quality.

[0075] In addition, the stress-absorbing material cooperates with the steel bars inside the gate pier 11 to form a dual control system of "early prevention + passive defense". First, it can control the occurrence of cracks. Second, even if tiny cracks occur, it can better control the development of tiny cracks inside the gate pier 11 towards large cracks, which is beneficial to the long-term operation of the gate pier 11 and improves durability and safety.

[0076] Secondly, in the strain gradient structure 13 formed by two stress absorbing materials with different strains, the inner layer of the strain absorbing material is recorded as the first stress absorbing material 131, and the outer layer of the strain absorbing material is recorded as the second stress absorbing material 132. The strain of the first stress absorbing material 131 is greater than the strain of the second stress absorbing material 132. In this embodiment, the concentric circle filling device can be used to realize the simultaneous construction and filling of two different strain absorbing materials, but the strain sizes of the two materials are different, the outer strain is small, and the inner strain is large, so that a certain strain gradient is formed, which is conducive to avoiding stress concentration at the interface between the strain absorbing material and the surrounding concrete again, and at the same time improving the integrity of the structure.

[0077] It should be noted that the present embodiment introduces two strain absorbing materials with different strains. In practice, the stress gradient can also be composed of three, four or more strain absorbing materials. In theory, the more holes there are, the richer the stress gradient changes, and the better the effect.

[0078] In addition, the construction method of the present invention is not only suitable for sluice construction, but can also be applied to large-volume concrete projects such as concrete gravity dams, reservoirs, and embankments.

[0079] Regarding the structural form of the cavity, it can be divided into the following types: The first type: the cavity is a fully enclosed structure, both ends of the cavity are closed and completely built into the gate pier 11, see the attached Fig.12 .

[0080] The second type: the cavity is a semi-closed structure; the bottom end of the cavity is built into the gate pier 11, which is a closed end; the top end of the cavity extends to the top of the gate pier 11, connected to the outside world, forming an open end, see the attached Fig.13 .

[0081] The third type: the cavity is an open structure, the cavity runs from the bottom of the gate pier 11 to the top of the gate pier 11, and the two ends of the cavity are flush with the bottom and top surfaces of the gate pier 11. See the attached Fig.14 .

[0082] Fourth: Based on any of the above three structural forms, the bottom end of the cavity can also pass through the gate pier 11 and extend into the gate bottom plate 10. See the attached Fig.15 In this embodiment, a stress absorbing layer is provided at the connection between the gate bottom plate 10 and the gate pier 11; the bottom end of the cavity passes through the stress absorbing layer. Of course, as another feasible embodiment, the stress absorbing layer may not be provided between the gate pier 11 and the gate bottom plate 10, and the stress absorbing layer may be made of acrylic mortar or rubber aggregate mortar or rubber aggregate mixed with acrylic mortar. The applicant's previous authorized patent text, a method for controlling cracks in a sluice gate pier 11 and a filling device, the authorization announcement number is CN103882836B.

[0083] In this embodiment, one or more holes can be provided, or one or more rows can be provided. Fig.16 - Fig.19 If multiple rows are used, for example two rows, the holes in the two adjacent rows are staggered.

[0084] Application results: In the construction method of the present invention, a concentric circle filling device is used and a construction process of filling while drilling is adopted, which can ensure that the filled stress absorbing material forms a complete whole with the surrounding concrete, effectively control the cracks in the gate pier 11, ensure the construction quality, and improve the durability and safety of the project.

[0085] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A concentric circle filling device, comprising a tube structure, wherein the tube structure comprises a hollow outer tube (1) and an inner tube (2), characterized in that: The outer tube body (1) and the inner tube body (2) are coaxially sleeved, an inclined tie rod (3) is connected between the top of the outer tube body (1) and the outer wall of the inner tube body (2), the annular area between the outer wall of the inner tube body (2) and the inner wall of the outer tube body (1) serves as a first storage space; and the internal cavity of the inner tube body (2) serves as a second storage space; An inflatable annular airbag (4) is sleeved on the inner tube body (2); when the annular airbag (4) is not inflated, the annular airbag (4) can slide up and down along the inner tube body (2); when the annular airbag (4) is inflated, one end of the first storage space can be completely sealed; an airbag ball (5) is arranged in the inner tube body (2); when the airbag ball (5) is inflated, one end of the second storage space can be completely sealed.

2. A concentric circle filling device according to claim 1, characterized in that: The bottom end of the inner tube body (2) is arranged flush with the bottom end of the outer tube body (1), and the top end of the inner tube body (2) is not lower than the top end of the outer tube body (1).

3. A concentric circle filling device according to claim 1 or 2, characterized in that: The annular airbag (4) is connected to a first inflation tube (7); the first inflation tube (7) passes through the top of the first storage space and extends to the top of the outer tube body (1); the airbag ball (5) is connected to a second inflation tube (8), and the second inflation tube (8) passes through the top of the second storage space and extends to the top of the inner tube body (2).

4. A concentric circle filling device according to claim 2, characterized in that: Corresponding slots (6) are respectively provided on the bottom tube walls of the inner tube body (2) and the outer tube body (1).

5. A concentric circle filling device according to claim 4, characterized in that: It also comprises a bottom support unit (w1), which is arranged at the bottom of the tubular structure; the bottom support unit (w1) can be adapted to be snap-fitted with the snap-fit ​​slot (6).

6. A concentric circle filling device according to claim 5, characterized in that: The bottom support unit (w1) is a cross-shaped structure formed by welding two support steel bars (9).

7. A concentric circle filling device according to claim 6, characterized in that: It also includes a top support unit, which includes a connecting piece (w2) and a pressing piece (w3), wherein: The connecting piece (w2) comprises a pressing sleeve (w21), the top of the pressing sleeve (w21) is connected to a positioning sleeve (w22), an annular partition (w23) is provided inside the pressing sleeve (w21), and the annular partition (w23) is fixedly connected to the inner wall of the pressing sleeve (w21); a bayonet (w24) is formed at the bottom of the pressing sleeve (w21), and the bayonet (w24) is adapted to be snap-fitted with the top of the inner tube body (2); The pressing member (w3) comprises a cross brace (w31), the cross brace (w31) is threadedly connected to a threaded rod (w32), the bottom of the threaded rod (w32) is adapted to be plugged into the positioning sleeve (w22); and a hole (w211) is provided on the side wall of the pressing sleeve (w21).

8. The method for applying the concentric circle filling device according to any one of claims 1 to 6 to control cracks in large concrete is applied to control cracks in a sluice gate, comprising the following steps: S1: Construction preparation; S2: foundation treatment; S3: Construction of the gate bottom plate (10); S4: Pier (11) construction: S41: Construction layout; S42: Binding and installation of pier reinforcement (12); S43: erecting a pier body formwork above the gate bottom plate (10); S44: Install multiple concentric circle filling devices at the designed position; S45: the annular airbag (4) and the airbag ball (5) are respectively slid downward along the inner tube body (2) to be located at the bottom of the inner tube body (2); the annular airbag (4) and the airbag ball (5) are respectively inflated using an inflation device until the annular airbag (4) completely seals the bottom end of the first storage space and the airbag ball (5) completely seals the bottom end of the second storage space, so as to isolate the concrete; S46: pouring concrete, vibrating and curing to construct the pier body; S47: After the concrete of the pier body is initially set, the annular airbag (4) is deflated, the annular airbag (4) is pulled to the top of the inner tube body (2) and temporarily tied and fixed with a rope, so as to temporarily position the annular airbag (4); the airbag ball (5) is deflated, and after deflation, the airbag ball (5) is pulled out of the inner tube body (2); S48: Fill the first storage space and the second storage space with stress absorbing materials with different strains respectively; lift up the concentric circle filling device to form a cavity after being pulled out; while lifting, two stress absorbing materials with different strains fall into the cavity at the same time to fill the cavity, so as to achieve filling while pulling out the tube, and construct a concentric circle strain gradient structure (13).

9. A construction method for filling stress absorbing material according to claim 8, characterized in that: The specific construction method of the concentric circle filling device in S44 is: S44-1, install the bottom support unit (w1): place the bottom support unit (w1) at the designed position, and tie and connect the bottom support unit (w1) and the pier body steel bars (12) to construct the lower limit foundation; S44-2, installing the concentric circle filling device: pressing the concentric circle filling device onto the bottom support unit (w1), and making the clamping groove (6) at the bottom of the tube structure clamped with the bottom support unit (w1); S44-3, installing the connecting piece (w2): sleeve-installing the connecting piece (w2) on the top of the inner tube body (2); S44-4, install the pressing member (w3): ​​place the cross brace (w31) above the connecting member (w2), and temporarily tie and fix the cross brace (w31) and the pier body steel bars (12); screw the threaded rod (w32), and move the threaded rod (w32) downward to be pressed in the positioning sleeve (w22) at the top of the connecting member (w2); the pressing member (w3) cooperates with the connecting member (w2) to construct an upper limiting foundation, and the upper limiting foundation and the lower limiting foundation fix the concentric circle filling device.

10. A construction method for filling stress absorbing material according to claim 8, characterized in that: The stress absorbing material includes but is not limited to rubber concrete, acrylic concrete, acrylic rubber concrete, rubber mortar, acrylic rubber mortar.

Images