Fabricated precast concrete assembly plate and construction method thereof

Abstract

The invention relates to the field of supporting and retaining structures, particularly discloses an assembly type precast concrete assembly plate and a construction method thereof, and aims to solve the problems of settlement deformation, large construction disturbance, untight connection, poor waterproof performance and the like of a precast plate retaining structure in the prior art. The splicing plate comprises a concrete plate pile and a splicing component, and a first semi-I-shaped groove and a second arc-shaped groove are formed in the two opposite sides of the concrete plate pile correspondingly and used for splicing. The first splicing component and the second splicing component are matched with the first groove and the second groove respectively, and early-strength micro-expansion self-compacting fine aggregate concrete can be poured into the film bag to enhance the connection strength and the waterproof performance. The construction method comprises the steps that a TRD pile machine is adopted for cutting and grooving, the plates are in lap joint, the assembly components are inserted, and grouting is conducted. By optimizing the plate design and the splicing mode, the construction quality and efficiency are improved, the structural stability and the waterproof performance are enhanced, meanwhile, environment-friendly materials are adopted, and industry innovation is promoted.

Description

Technical Field

[0001] The invention belongs to the field of support and enclosure structures, and specifically relates to an assembled prefabricated concrete assembly plate and a construction method thereof. Background Art

[0002] Although underground continuous walls are widely used in deep foundation pit projects such as subway stations and large underground urban complexes in soft soil areas, they also face many problems: first, a large amount of mud is needed to protect the walls when forming trenches, and the waste slurry is difficult to discharge, which puts pressure on the environment; second, the construction process is complicated, requires a larger site, and has a long period of time; third, wall construction will disturb adjacent foundations, especially when close to existing buildings or subway tunnels, which increases the difficulty of construction and environmental pressure; fourth, it is difficult to control the quality of underwater concrete pouring, which can easily lead to hidden dangers of joint leakage.

[0003] With the advancement of green and low-carbon development and building industrialization in my country, traditional cast-in-place retaining structures have been unable to meet the needs of high-quality projects due to problems such as large wet operations, serious environmental pollution, large amounts of materials, and long construction periods. In contrast, prestressed concrete sheet piles are widely used in engineering due to their high bearing capacity, stable quality, fast construction, low cost, and environmental protection. Common types include I-shaped, Z-shaped, and L-shaped sheet piles. The key to its construction quality lies in the tight connection between the piles, which is usually achieved through mortise and tenon bites or groove grouting to prevent seepage and stop water. There are also traditional membrane bags inserted into grooves. However, these connection methods still have many problems in actual applications:

[0004] Problem 1: When constructing on a soft foundation, the prefabricated plate retaining structure is prone to settlement and deformation. Due to insufficient bearing capacity of the foundation, the stability of the retaining structure is difficult to ensure, and foundation reinforcement may be required, increasing construction costs and construction period.

[0005] Question 2: In city centers or densely built areas, the construction machinery and construction techniques of traditional retaining structures cause significant disturbance to the surrounding soil, thus affecting the safety performance of surrounding buildings.

[0006] Question 3: In traditional retaining structures, rigid connections are usually used at the plate connection points. During the construction process, due to various factors, the connection points often cannot be effectively connected.

[0007] Question 4: Traditional waterproofing methods have limited waterproofing effects on the joints of prefabricated panels.

[0008] Question 5: The performance of membrane bags is relatively simple, and traditional membrane bags can only be used for waterproof structures.

[0009] Question 6: Traditional membrane bags have poor wear resistance, are prone to aging, and traditional materials are highly polluting.

[0010] Therefore, the prior art still lacks a stable, reliable and long-term effective precast concrete assembly board and a construction method thereof for waterproofing the precast board structure and its joints. Summary of the invention

[0011] The purpose of the present invention is to provide an assembled prefabricated concrete assembly plate and a construction method thereof, so as to solve the above-mentioned technical problems existing in the prior art.

[0012] To achieve the above object, in one aspect, the present invention provides an assembled prefabricated concrete assembly plate, comprising:

[0013] A concrete sheet pile comprises a pile body and a steel cage, wherein the steel cage is arranged in the pile body; two opposite sides of the concrete sheet pile are provided with a groove 1 and a groove 2 for splicing, wherein the groove 1 is a semi-I-shaped groove, and the groove 2 is an arc shape;

[0014] Assembling component one, matched with the groove one, is used to connect two adjacent concrete sheet piles; the assembling component one comprises a membrane bag one adapted to the shape of the groove one, one end of the membrane bag one is open and the other end is closed, and the bottom of the membrane bag one is connected to a counterweight body one;

[0015] The second assembly component cooperates with the second groove and is used to connect two adjacent concrete sheet piles; the second assembly component includes a second membrane bag adapted to the shape of the second groove, one end of the membrane bag is open and the other end is closed, and the bottom of the membrane bag is connected to a counterweight body.

[0016] Optionally, the middle portion of the membrane bag 1 is provided with a plurality of supporting ribs 1 that are adapted to the cross-sectional shape of the groove 1; the middle portion of the membrane bag 2 is provided with a plurality of supporting ribs 2 that are adapted to the cross-sectional shape of the groove 2.

[0017] Optionally, a membrane bag lock is provided at the end of the concrete sheet pile, which is used to fix membrane bag one and membrane bag two to the end of the concrete sheet pile during the grouting process.

[0018] Optionally, the bag bodies of the membrane bag 1 and the membrane bag 2 are both formed by blending UHMWPE fibers and PLA fibers with TiO2 nanoparticles introduced therein.

[0019] Optionally, the height of groove 1 is 1 / 5 to 1 / 4 of the width of the edge on which it is located, the width of the groove belly is 1 / 12 to 1 / 10 of the width of the edge on which it is located, the width of the flange is 1 / 5 to 1 / 4 of the width of the edge on which it is located, and the depth of the flange is 1 / 16 to 1 / 15 of the width of the edge on which it is located.

[0020] Optionally, the arc length of the groove 2 is 1 / 5 to 1 / 4 of the width of the side on which it is located.

[0021] Optionally, the longitudinal main reinforcement of the steel cage includes prestressed steel bars and non-prestressed steel bars, the prestressed steel bars are steel bars for prestressed concrete, the non-prestressed steel bars are hot-rolled ribbed steel bars, and the stirrups are hot-rolled low-carbon steel round bars.

[0022] Optionally, the interior of the concrete sheet pile is hollow and provided with a circular hole.

[0023] In another aspect, the present invention further provides a construction method of an assembled prefabricated concrete assembly plate, according to any of the above-mentioned assembled prefabricated concrete assembly plates, comprising the following steps:

[0024] S1. Use TRD pile driver to cut grooves at corresponding positions of foundation;

[0025] S2, bridging the assembled prefabricated concrete panels into a wall through a positioning guide frame;

[0026] S3, inserting assembly component 1 and assembly component 2 between adjacent concrete sheet piles;

[0027] S4. Pour early-strength slightly-expanding self-compacting fine stone concrete into the membrane bags in assembly component 1 and assembly component 2.

[0028] Preferably, the early-strength slightly expansive self-compacting fine stone concrete is prepared from silicate cement, sand, stone, fly ash, UEA and a water reducing agent.

[0029] The present invention discloses the following technical effects:

[0030] 1. Improved construction quality and efficiency

[0031] The present invention uses a TRD pile driver to cut grooves at corresponding positions of the foundation, and overlaps the assembled prefabricated concrete assembly panels into walls through a positioning guide frame. Compared with traditional cast-in-place ground-connected walls, this method effectively solves the problems of difficult construction quality control, large foundation disturbance and high cost. The connection between the plates adopts a plastic overlap method, which overcomes the defect of poor traditional rigid overlap effect. In addition, the larger groove area designed for the pile body ensures the adequacy of grouting and makes the connection tighter. The prestressed tendons and non-prestressed tendons are effectively overlapped by stirrups inside the pile body, further ensuring the quality reliability of the pile body.

[0032] 2. Enhanced structural stability and waterproof performance

[0033] By inserting a waterproof membrane bag into the full-length groove reserved in the plate and performing grouting, the present invention can effectively prevent leakage problems at the plate joints and significantly improve the structural stability and functional performance of the prefabricated underground continuous wall. This design not only enhances the integrity of the wall, but also effectively reduces the maintenance cost and risk caused by leakage, and prolongs the service life of the project.

[0034] 3. Environmental performance and industry innovation

[0035] The present invention improves the traditional film bag materials and blending technology, and enhances the wear resistance, aging resistance and impermeability of the film bag. This improvement not only improves the environmental performance of the film bag in engineering applications, but also promotes the integration and innovation of civil engineering and the textile industry, and provides new ideas and methods for the development of related fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 It is a schematic diagram of the structure of a concrete sheet pile in an embodiment of the present invention;

[0038] Figure 2 is a schematic cross-sectional view of a concrete sheet pile in an embodiment of the present invention;

[0039] Figure 3 Schematic diagram of the arrangement of a steel cage in an embodiment of the present invention;

[0040] Figure 4 It is a structural schematic diagram of an assembly component 1 in an embodiment of the present invention;

[0041] Figure 5 It is a schematic diagram of an assembled component of the present invention, a middle film bag, in a semi-contracted state;

[0042] Figure 6 This is a structural schematic diagram of an assembly component 2 in an embodiment of the present invention;

[0043] Figure 7 It is a structural schematic diagram of an assembled prefabricated concrete assembly plate according to an embodiment of the present invention;

[0044] Figure 8 This is an enlarged view of the end of the assembled prefabricated concrete assembly plate according to an embodiment of the present invention.

[0045] Among them, 1. Concrete sheet pile; 11. Groove one; 12. Groove two; 2. Steel cage; 3. Assembly component one; 31. Membrane bag one; 32. Counterweight one; 33. Support reinforcement one; 4. Assembly component two; 41. Membrane bag two; 42. Counterweight two; 43. Support reinforcement two; 5. Membrane bag lock. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] In view of the problems and shortcomings of the prior art recorded in the background technology, an embodiment of the present invention provides an assembled precast concrete assembly panel, which has a reasonable structure, high rigidity, beautiful facade, efficient production and reliable construction. An embodiment of the present invention also provides a construction method of the assembled precast concrete assembly panel, in which membrane bags are inserted between adjacent concrete sheet piles 1. The operation is feasible, the cost is reasonable, the adaptability is strong, and the anti-seepage and water-stopping effects are excellent after construction.

[0048] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0049] Example 1

[0050] Reference Figures 1 to 8 As shown, embodiment 1 of the present invention provides an assembled prefabricated concrete assembly plate, including a concrete sheet pile 1 and an assembly component 1 3 and an assembly component 2 4 for assembling each concrete sheet pile 1, the concrete sheet pile 1 includes a pile body and a steel cage 2, and the steel cage 2 is arranged in the pile body.

[0051] like Figure 3 As shown, the longitudinal main reinforcement of the steel cage 2 includes prestressed steel bars and non-prestressed steel bars; the prestressed steel bars are steel bars for prestressed concrete, the non-prestressed steel bars are hot-rolled ribbed steel bars, and the stirrups are low-carbon steel hot-rolled round wire rods; this steel bar configuration method gives full play to the advantages of different steel bar materials. The high strength and low relaxation of the steel bars for prestressed concrete ensure the long-lasting effectiveness of the prestress. The excellent tensile properties and plasticity of the hot-rolled ribbed steel bars meet the bearing and construction requirements of the structure. The low-carbon steel hot-rolled round wire rods as stirrups provide good plasticity and toughness, which overall improves the bearing capacity, stability, durability and construction convenience of the concrete structure.

[0052] The assembled precast concrete assembly panels of this embodiment are grooved at corresponding positions of the foundation using a TRD pile driver, and then the assembled precast concrete assembly panels are overlapped to form a wall through a positioning guide frame; this construction method combines soil retaining and water-saving performance. At the same time, this construction method makes the wall performance good and the quality easy to control.

[0053] It should be understood that the TRD pile driver is a key equipment used in the construction of equal thickness cement soil mixing wall technology (TRD method). Its main engine provides power and operation control, and the chain saw tool box mixes the soil and pours cement slurry through up and down rotation and horizontal movement to form a continuous wall. The equipment is equipped with a cutting fluid and curing fluid injection system, a measurement and monitoring system, and a crawler walking device. The TRD pile driver has strong adaptability and can be constructed in a variety of strata. The main engine has a low height, high stability, good wall quality, uniform and continuous wall, small strength discreteness, high verticality, construction depth up to 80 meters, thickness of 550-1200 mm, can meet the needs of different projects.

[0054] The cross section of the pile body is circular inside and square outside, and a through groove 11 and a through groove 2 12 are respectively provided on opposite sides for splicing with adjacent pile bodies.

[0055] Specifically, the groove 11 is a semi-I-shaped groove, the height of the groove 11 is 1 / 5 to 1 / 4 of the width of the side where it is located, the groove belly width D1 is 1 / 12 to 1 / 10 of the width of the side where it is located, the flange width D2 is 1 / 5 to 1 / 4 of the width of the side where it is located, and the flange depth D3 is 1 / 16 to 1 / 15 of the width of the side where it is located. Figure 2 The size design of the I-shaped groove is not only easy to vibrate and compact, but also beneficial to increase the contact area between the plates, thereby making the connection between the plates more firm.

[0056] The second groove 12 is an arc-shaped groove, and the arc length of the second groove 12 is 1 / 5 to 1 / 4 of the width of the side where it is located. The arc groove area used in the pile body is large, which solves the problems of slow grouting efficiency and loose vibration.

[0057] like Figure 4 and Figure 5 As shown, the assembly component 3 is used to cooperate with the groove 11 to connect two adjacent concrete sheet piles 1. Therefore, the assembly component 3 is an I-shaped membrane bag, and the assembly component 3 includes an I-shaped membrane bag 31, a counterweight body 32 and a supporting rib 33. The membrane bag 31 is a long strip bag-like object with one end open and the other end closed. The height of the membrane bag 31 is less than or equal to the length of the groove 11 and cannot be higher than the end of the pile body. The cross-sectional form of the membrane bag 31 is similar to the cross-sectional form of the groove 11. The middle part of the membrane bag 31 is provided with a plurality of supporting ribs 33 that are adapted to the cross-sectional shape. The bottom of the membrane bag 31 is connected to a counterweight body 32. Preferably, the counterweight body 32 is made of steel to assist the membrane bag 31 in overcoming the friction of the groove wall of the groove 11 and the influence of the bottom silt to achieve the design depth requirement.

[0058] like Figure 6As shown, the assembly component 2 4 is used to cooperate with the groove 2 12 to connect two adjacent concrete sheet piles 1. Therefore, the assembly component 2 4 is an arc-shaped membrane bag, and the assembly component 2 4 includes a membrane bag 2 41, a counterweight body 2 42 and a supporting rib 2 43. The membrane bag 2 41 is a long strip bag-like object with one end open and the other end closed. The height of the membrane bag 2 41 is less than or equal to the length of the groove 2 12 and cannot be higher than the end of the pile body. The cross-section of the membrane bag 2 41 is circular, and the middle part of the membrane bag 2 41 is provided with a plurality of supporting ribs 2 43 that are adapted to the cross-sectional shape. The bottom of the membrane bag 2 41 is provided with a counterweight body 2 42. Preferably, the counterweight body 2 42 is made of steel to assist the membrane bag 2 41 in overcoming the friction of the groove wall of the groove 2 12 and the influence of the bottom silt to achieve the design depth requirement.

[0059] According to a further optimization scheme, the bag bodies of the membrane bag 1 31 and the membrane bag 2 41 are both made of polymer fibers through a textile process to form a new type of composite material that is wear-resistant, impermeable, anti-aging, highly plastic, and more environmentally friendly.

[0060] In a specific embodiment, the bag bodies of the membrane bag 1 31 and the membrane bag 2 41 are both made of UHMWPE fiber and PLA fiber mixed with TiO2 nanoparticles, and a new type of composite material that is wear-resistant, anti-seepage, anti-aging, and more environmentally friendly is formed through a textile process. The membrane bag has a certain ductility, and the early-strength micro-expansion self-compacting high-strength concrete filled is tightly connected to the original prefabricated concrete sheet pile 1 after curing and solidification, and has a good anti-seepage and water-stopping effect. The membrane bag has a restraining effect on the filler, and there is no need to worry about the slurry leakage phenomenon caused by direct grouting during water-based construction or when the pile body is greatly offset.

[0061] According to a further optimization scheme, a membrane bag lock 5 is provided at the end of the concrete sheet pile 1 for effectively connecting the membrane bag with the end of the sheet during the grouting process. This arrangement is also beneficial to the placement of the membrane bag and the stability of the grouting.

[0062] In some embodiments, the grouting material is an early-strength, slightly expansive, self-compacting fine stone concrete prepared with relevant proportions of silicate cement and sand, stone, fly ash, UEA, and water reducer.

[0063] Compared with the prior art, the embodiment 1 of the present invention discloses at least the following beneficial effects:

[0064] The assembled precast concrete assembly panels of this embodiment are connected by concrete sheet piles 1 and assembly components 1 3 and 2 4. A TRD pile driver is used to cut grooves at corresponding positions of the foundation, and then the assembled precast concrete assembly panels are overlapped to form a wall through a positioning guide frame, which solves the problems of difficult quality control, large disturbance and high cost of traditional cast-in-place ground-connected walls.

[0065] The pile body of the concrete sheet pile 1 is designed as a large groove design with plastic overlap, which solves the problems of traditional rigid overlap and insufficient groove grouting and loose connection.

[0066] The stress reinforcement adopts steel bars for prestressed concrete, the non-prestressed reinforcement adopts hot-rolled ribbed steel bars, and the stirrups adopt hot-rolled low-carbon steel round bars; this reinforcement configuration method gives full play to the advantages of different reinforcement materials and improves the bearing capacity, stability, durability and construction convenience of the concrete sheet pile 1 structure as a whole;

[0067] By reserving a full-length groove, inserting the improved wear-resistant, anti-aging and anti-seepage membrane bag, and pouring early-strength micro-expansion self-compacting fine stone concrete into the membrane bag, leakage at the joint is effectively prevented, the stability and functional performance of the prefabricated underground continuous wall are improved, and the maintenance cost and risk are reduced;

[0068] An I-shaped supporting steel bar is arranged in the I-shaped membrane bag 31, and can be used as a temporary connecting member when it is initially placed in the groove 11 to ensure effective connection between the plates before the grouting solidifies.

[0069] Example 2

[0070] Embodiment 2 of the present invention provides a construction method for an assembled prefabricated concrete assembly plate. According to the assembled prefabricated concrete assembly plate described in Embodiment 1, the construction method comprises the following steps:

[0071] S1. Use TRD pile driver to cut grooves at corresponding positions of foundation;

[0072] S2, bridging the assembled prefabricated concrete panels into a wall through a positioning guide frame;

[0073] S3, inserting assembly component 1 3 and assembly component 2 4 between adjacent concrete sheet piles 1;

[0074] S4. Pour early-strength slightly-expanding self-compacting fine stone concrete into the membrane bags in the assembly component 1 3 and the assembly component 2 4.

[0075] Preferably, the early-strength slightly expansive self-compacting fine stone concrete is prepared from silicate cement, sand, stone, fly ash, UEA and a water reducing agent.

[0076] The details not described in detail in the present invention are all conventional technical means known to those skilled in the art.

[0077] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0078] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. An assembled prefabricated concrete assembly panel, characterized in that: include: A concrete sheet pile (1) comprises a pile body and a steel cage (2), wherein the steel cage (2) is arranged inside the pile body; two opposite sides of the concrete sheet pile (1) are provided with a first groove (11) and a second groove (12) for splicing, wherein the first groove (11) is in a semi-I shape, and the second groove (12) is in an arc shape; An assembling component (3) cooperates with the groove (11) and is used to connect two adjacent concrete sheet piles (1); the assembling component (3) comprises a membrane bag (31) adapted to the shape of the groove (11), one end of the membrane bag (31) is open and the other end is closed, and a counterweight (32) is connected to the bottom of the membrane bag (31); The second assembling component (4) cooperates with the second groove (12) and is used to connect two adjacent concrete sheet piles (1); the second assembling component (4) comprises a second membrane bag (41) adapted to the shape of the second groove (12), one end of the second membrane bag (41) is open and the other end is closed, and the bottom of the second membrane bag (41) is connected to a second counterweight body (42).

2. The assembled prefabricated concrete assembly board according to claim 1, characterized in that: The middle portion of the membrane bag 1 (31) is provided with a plurality of supporting ribs 1 (33) that are compatible with the cross-sectional shape of the groove 1 (11); the middle portion of the membrane bag 2 (41) is provided with a plurality of supporting ribs 2 (43) that are compatible with the cross-sectional shape of the groove 2 (12).

3. The assembled prefabricated concrete assembly board according to claim 1, characterized in that: The ends of the concrete sheet pile (1) are provided with film bag lock buckles (5) for fixing film bag one (31) and film bag two (41) to the ends of the concrete sheet pile (1) during the grouting process.

4. The assembled prefabricated concrete assembly board according to claim 1, characterized in that: The bag bodies of the membrane bag 1 (31) and the membrane bag 2 (41) are both made of UHMWPE fibers and PLA fibers mixed with TiO2 nanoparticles.

5. The assembled prefabricated concrete assembly board according to claim 1, characterized in that: The height of the groove 1 (11) is 1 / 5 to 1 / 4 of the width of the side where it is located, the width of the groove belly is 1 / 12 to 1 / 10 of the width of the side where it is located, the width of the flange is 1 / 5 to 1 / 4 of the width of the side where it is located, and the depth of the flange is 1 / 16 to 1 / 15 of the width of the side where it is located.

6. The assembled prefabricated concrete assembly board according to claim 1, characterized in that: The arc length of the second groove (12) is 1 / 5 to 1 / 4 of the width of the side where it is located.

7. The assembled prefabricated concrete assembly board according to claim 1, characterized in that: The longitudinal main reinforcement of the reinforcement cage (2) comprises prestressed reinforcement and non-prestressed reinforcement, the prestressed reinforcement is a steel bar for prestressed concrete, the non-prestressed reinforcement is a hot-rolled ribbed steel bar, and the stirrups are hot-rolled low-carbon steel round bars.

8. The assembled prefabricated concrete assembly board according to claim 1, characterized in that: The concrete sheet pile (1) is hollow inside and is provided with a circular hole.

9. A construction method of an assembled prefabricated concrete assembly plate, the assembled prefabricated concrete assembly plate according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Use TRD pile driver to cut grooves at corresponding positions of foundation; S2, bridging the assembled prefabricated concrete panels into a wall through a positioning guide frame; S3, inserting assembly component 1 (3) and assembly component 2 (4) between adjacent concrete sheet piles (1); S4. Pour the early-strength slightly-expanding self-compacting fine-stone concrete into the membrane bags in the assembly component 1 (3) and the assembly component 2 (4).

10. The construction method of the assembled prefabricated concrete assembly plate according to claim 9, characterized in that: The early-strength slightly-expanding self-compacting fine stone concrete is prepared from silicate cement, sand, stone, fly ash, UEA and a water reducing agent.

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