Waterproofing Structure and Methods for the Connection Between New and Old Underground Concrete Structures

Abstract

This invention discloses a waterproof structure for the connection between new and old underground concrete structures, including a T-shaped rubber waterstop, waterproof sealant, a connection component for the new and old structures, a waterproof layer, a brick formwork, and an anti-seepage material. The T-shaped rubber waterstop is placed at the vertical and horizontal junctions of the new and existing concrete structures, including a horizontal waterstop and a vertical waterstop. One end of the horizontal waterstop extends into the junction of the new and existing concrete structures and fits against the connection component at the junction. The outer end of the vertical waterstop is an inwardly curved arc structure, and the outer end of the horizontal waterstop is a downwardly curved arc structure. The outer side of the T-shaped structure is covered with an anti-seepage material. The end of the connection component away from the T-shaped rubber waterstop is filled with waterproof sealant. This effectively cuts off the path of groundwater seepage, improves the overall waterproof performance of the structure, increases the strength of the connection, and facilitates construction.

Description

Technical Field

[0001] This invention belongs to the field of building construction, specifically relating to a waterproof structure and method for the connection between new and old underground concrete structures. Background Technology

[0002] In the process of urban construction and maintenance, the public's demand for underground space is increasing, and society is paying more and more attention to the utilization of underground space. A large number of basement renovation projects have emerged, which often involve connecting new and old underground concrete structures. Traditional connection methods have problems such as low connection strength, poor stability, and susceptibility to groundwater. Leakage caused by damage to the construction joint waterproofing system due to factors such as settlement and deformation often occurs in engineering practice. Therefore, it is necessary to waterproof the construction joints of the newly added structure.

[0003] In existing technologies, one approach is to treat construction joints by setting expansion joints. While this method is economical and reasonable, uneven settlement between the old and new structures can cause the waterstop to tear, leading to water seepage. Furthermore, formwork is required during construction, which can be difficult in space-constrained situations. Another approach involves waterproofing structures designed for the junction of basement extensions. While this improves waterproofing effectiveness, the construction process is complex, the quality is difficult to guarantee, and the actual waterproofing effect is not always satisfactory. A third design addresses waterproofing joints in basement exterior wall extensions. Although it solves some waterproofing problems, its waterproofing structure is prone to damage and has a short service life. Summary of the Invention

[0004] In view of the defects in the above-mentioned background technology, such as the large potential risks to construction safety and quality, the present invention aims to solve the problems of low structural connection strength, poor stability, easy damage, and short service life at the connection between new and old concrete structures in the prior art.

[0005] To address the above problems, the technical solution adopted by the present invention is: a waterproof structure for the connection between new and old underground concrete structures, including a T-shaped rubber waterstop, waterproof sealant, a connection component between the new and old structures, a waterproof layer, a brick formwork, and anti-seepage materials.

[0006] The T-shaped rubber waterstop is installed at the vertical and horizontal junctions of the newly constructed concrete structure and the existing concrete structure. It includes a horizontal waterstop arranged along the upper surface of the existing concrete structure and a vertical waterstop arranged along the side of the newly constructed concrete structure. One end of the horizontal waterstop extends into the junction between the new and existing concrete structures and fits into the connection components between the old and new structures at the junction. The horizontal and vertical waterstops together form a T-shaped structure. The outer end of the vertical waterstop is an inwardly curved arc, and the outer end of the horizontal waterstop is a downwardly curved arc. (The curved structure increases the seepage path length of the joint between the rubber waterstop and the structure; the non-linear joint effectively cuts off the path of groundwater seepage.)

[0007] The horizontal and vertical waterstops together form a T-shaped structure, the outer side of which is covered with an impermeable material. The outer surface of the impermeable material is covered with a brick membrane, and the outer surface of the brick membrane is covered with a waterproof layer.

[0008] (The waterstop is bonded to the existing structure with a waterproof adhesive, which can, to some extent, prevent the waterstop from breaking due to structural misalignment and improve the overall waterproof performance of the structure.)

[0009] The new and old structure connection component serves to connect the newly built concrete structure and the original concrete structure. The end of the new and old structure connection component away from the T-shaped rubber waterstop is filled with waterproof caulking material.

[0010] Furthermore, the new and old structure connection assembly includes a plate (e.g., a steel plate) that is attached to the horizontal waterstop, a threaded head member embedded in the newly built concrete structure, and an expansion bolt embedded in the original concrete structure; the plate is provided with multiple threaded holes; the threaded head member and the expansion bolt are all connected to the plate through the threaded holes.

[0011] Furthermore: the end of the inwardly curved arc structure is flush with the outer surface of the newly built concrete structure; the end of the downwardly curved arc structure is flush with the outer surface of the original concrete structure.

[0012] Furthermore, the impermeable material is plain impermeable concrete.

[0013] Furthermore, the waterproof layer is a waterproof mortar or a composite waterproof layer; the composite waterproof layer includes a flexible waterproof layer and a rigid waterproof layer stacked sequentially. The flexible waterproof layer is a polymer waterproof membrane layer, and the rigid waterproof layer is a waterproof mortar layer. The waterproof mortar layer is placed on top of the flexible waterproof layer, forming an integral whole with it to constitute the composite waterproof layer. (The flexible waterproof layer is usually made of flexible materials such as rubber, asphalt, or specific polymer materials, which have good elasticity and deformation capacity. At the junction of new and old underground concrete structures, the structure may undergo slight deformation due to factors such as temperature changes, foundation settlement, or earthquakes. The flexible waterproof layer can adapt to these deformations, avoiding cracks and leaks caused by structural deformation.)

[0014] Furthermore, the waterproof sealant is a waterproof sealant paste.

[0015] Furthermore, grooves are provided on both sides of the new and old structural connection components, and expansion sealing strips are embedded in the grooves.

[0016] Furthermore, the impermeable material is generally spherical.

[0017] As another aspect of the present invention, a construction method for a waterproof structure at the junction of old and new underground concrete structures is also provided, comprising the following steps:

[0018] Step 1: Roughen the existing concrete structure, clean the existing concrete structure down to the existing waterproof layer, and locate the T-shaped rubber waterstop, expansion waterstop strip, and the connection components between the old and new structures.

[0019] Step 2: Grooves are cut at the arc-shaped ends of the T-shaped rubber waterstop and the expansion waterstop strip on the original structure, and the T-shaped rubber waterstop and expansion waterstop strip are embedded into the original structure and fixed in place;

[0020] Step 3: The new and old structural connection components are fixedly connected to the original structure with expansion bolts. After the steel reinforcement of the new concrete structure is tied, the threaded rod is screwed into the threaded hole on the plate. Then, the formwork is erected and the new structure concrete is poured. The back side of the expansion waterstop strip is filled with waterproof sealant.

[0021] Step 4: Construction of the brick formwork. The brick formwork is built into an arch shape, and waterproof mortar is applied to the water-facing side.

[0022] Step 5: After the brick formwork is completed, the T-shaped rubber waterstop is tightly bonded to the new concrete structure and the original structure, and then plain impermeable concrete is poured.

[0023] The beneficial effects and features of this invention are:

[0024] (1) The waterproof structure at the connection between the old and new underground concrete structures of the present invention; by designing a new type of T-shaped rubber waterstop, the problem of waterstop breakage caused by structural misalignment can be effectively avoided. The end that fits with the old and new concrete structures is designed as an arc, which can effectively cut off the path of groundwater infiltration and improve the overall waterproof performance of the structure.

[0025] (2) The waterproof structure at the connection between the new and old underground concrete structures of the present invention; by setting the connection components of the new and old structures at the connection between the new structure and the original structure, the strength of the connection part is increased, and the problems of low connection strength and poor stability of traditional connection methods are solved. The steel bars and steel plates of the new structure are anchored into the connection components of the new and old structures and connected by threads, which does not affect the construction of the steel mesh of the new structure and the construction is convenient.

[0026] (3) The waterproof structure at the connection between the old and new underground concrete structures of the present invention; by designing the brick formwork as an arch, the arch has good stability performance, which can effectively solve the influence of the backfill soil lateral pressure on the construction joint retaining structure, and can be directly used as a template structure without demolition, making construction convenient. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the waterproof structure at the connection between the old and new underground concrete structures according to a preferred embodiment of the present invention.

[0028] Figure 2 This is a schematic diagram of the connection components between the old and new concrete structures according to a preferred embodiment of the present invention.

[0029] Figure 3 This is a schematic diagram of the steel plate structure of the new and old structural connection components according to a preferred embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the threaded head rod structure according to a preferred embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the resistance enhancement structure according to a preferred embodiment of the present invention;

[0032] In the diagram: 1-T-type rubber waterstop, 2-expansion waterstop strip, 3-waterproof caulking compound, 4-connection component between new and old structures, 4-1-plate, 4-2-threaded rod, 5-new concrete structure, 6-waterproof layer, 7-brick formwork, 8-anti-seepage material, 9-expansion bolt, 10-existing concrete structure, 11-threaded hole, 12-crossbar. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Please refer to Figure 1 This invention provides a waterproof structure and method for the connection between new and old underground concrete structures. By setting a connection component between the new and existing structures, the strength of the connection is increased. The connection component is anchored into the reinforcing bars and steel plates of the new structure via threads, without affecting the construction of the reinforcing mesh of the new structure, making construction convenient. Waterproofing measures such as T-shaped rubber waterstops and expansion sealing strips ensure the waterproof performance of the construction joint. The T-shaped rubber waterstop is less prone to breakage due to uneven settlement between the new and old structures, effectively improving the stability of the waterproof structure. This structure is simple, easy to construct, and can effectively connect new and old concrete structures, improving connection strength and waterproof performance, extending the service life of the structure, and effectively solving the seepage risks caused by settlement at construction joints in underground expansion structures.

[0035] Please refer to Figures 2-4 The connection structure includes a T-shaped rubber waterstop 1, an expansion waterstop strip 2, a waterproof sealant 3, a new and old structure connection component 4, a steel plate 4-1, a threaded rod 4-2, a new concrete structure 5, waterproof mortar, a brick formwork 7, plain impermeable concrete 8, an expansion bolt 9, an existing concrete structure 10, and a threaded hole 11.

[0036] The T-shaped rubber waterstop 1 has one end bonded to the new and old structure connection component 4, and the other two ends are designed as arcs (in addition to arcs, they can also be designed as wavy or sawtooth shapes to further increase the water penetration resistance. When the wavy or sawtooth shape is stretched or compressed by external forces, it can better disperse stress, reduce local stress concentration of the waterstop, and extend the service life of the waterstop). This increases the seepage path length of the joint between the rubber waterstop and the structure. The non-straight joint can effectively cut off the path of groundwater seepage. The waterstop is bonded to the original structure with waterproof adhesive, which can avoid the problem of waterstop breakage due to structural misalignment to a certain extent and improve the overall waterproof performance of the structure.

[0037] The expansion waterstop strip 2 is inserted into grooves on both sides of the old and new structure connection component 4 on the original concrete structure 10, and the expansion waterstop strip 2 is filled with waterproof sealant 3 on the back side to improve the waterproof performance of the construction joint between the old and new structures.

[0038] The new and old structure connection component 4 includes a steel plate 4-1 and a threaded rod 4-2. The new and old structure connection component 4 is fixedly connected to the original concrete structure 10 by expansion bolts 9. After the reinforcement of the new concrete structure 5 is tied, the threaded rod 4-2 is screwed into the threaded hole 11 on the steel plate 4-1 to improve the connection strength between the new and old structures.

[0039] The brick formwork 7 is constructed in the shape of a circular arch, which has good stability and can effectively solve the impact of backfill lateral pressure on the construction joint retaining structure. It can be directly used as the template structure for plain impermeable concrete 8 without demolition, making construction convenient. The brick formwork 7 is covered with waterproof mortar.

[0040] Please refer to Figure 5 In some preferred embodiments, resistance-enhancing structures, such as crossbars 12 fixedly connected to the threaded head member 4-2 or the expansion bolts 9 embedded in the original concrete structure, can also be provided on the threaded head member 4-2 and the expansion bolts 9 embedded in the original concrete structure.

[0041] Embodiments of the present invention provide a waterproof structure and method for the connection between new and old underground concrete structures. By setting a connection component between the new and existing structures at the connection point, the strength of the connection is increased. The steel bars and steel plates of the new structure are anchored into the connection component and connected by threads, which does not affect the construction of the steel mesh of the new structure, making construction convenient. Waterproof measures such as T-shaped rubber waterstops and expansion waterstops are provided to ensure the waterproof performance of the construction joint. The T-shaped rubber waterstops are not easily broken due to uneven settlement between the new and old structures, effectively improving the stability of the waterproof structure.

[0042] The embodiments of the present invention have a simple structure and are easy to construct. They can effectively connect new and old concrete structures, improve connection strength and waterproof performance, extend the service life of the structure, and effectively solve the problem of water seepage hazards caused by settlement of construction joints in underground expansion structures.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the structural relationships and principles of the invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed.

Claims

1. A waterproof structure for the connection between old and new underground concrete structures, characterized in that... :Including T-type rubber waterstop (1), waterproof sealant (3), new and old structural connection components (4), waterproof layer (6), brick formwork (7) and anti-seepage material (8); The T-shaped rubber waterstop (1) is set at the junction of the new concrete structure (5) and the original concrete structure (10) in the vertical and horizontal directions. It includes a horizontal waterstop arranged horizontally along the upper surface of the original concrete structure (10) and a vertical waterstop arranged along the side of the new concrete structure (5). One end of the horizontal waterstop extends into the junction of the new concrete structure (5) and the original concrete structure (10) and fits with the new and old structure connection component (4) at the junction. The horizontal waterstop and the vertical waterstop form a T-shaped structure as a whole. The outer end of the vertical waterstop is an arc-shaped structure that bends inward, and the outer end of the horizontal waterstop is an arc-shaped structure that bends downward. The horizontal and vertical waterstops together form a T-shaped structure, and the outer side is covered with an impermeable material (8). The outer surface of the impermeable material (8) is covered with a brick membrane (7), and the outer surface of the brick membrane (7) is covered with a waterproof layer (6). The new and old structure connection component (4) serves to connect the newly built concrete structure (5) and the original concrete structure (10). The end of the new and old structure connection component (4) away from the T-shaped rubber waterstop is filled with waterproof sealant (3). The new and old structure connection assembly (4) includes a plate (4-1) that is attached to the horizontal waterstop, a threaded head member (4-2) embedded in the new concrete structure (5) and an expansion bolt (9) embedded in the original concrete structure (10); multiple threaded holes (11) are provided on the plate (4-1); the threaded head member (4-2) and the expansion bolt (9) are connected to the plate (4-1) through the threaded holes (11).

2. The waterproof structure at the connection between old and new underground concrete structures according to claim 1, characterized in that: The end of the inwardly curved arc structure is flush with the outer surface of the newly built concrete structure (5); the end of the downwardly curved arc structure is flush with the outer surface of the original concrete structure (10).

3. The waterproof structure at the connection between old and new underground concrete structures according to claim 1, characterized in that: The impermeable material is plain impermeable concrete.

4. The waterproof structure at the connection between old and new underground concrete structures according to claim 1, characterized in that: The waterproof layer (6) is a waterproof mortar or a composite waterproof layer; the composite waterproof layer includes a flexible waterproof layer and a rigid waterproof layer stacked in sequence. The flexible waterproof layer is a polymer waterproof membrane layer, and the rigid waterproof layer is a waterproof mortar layer. The waterproof mortar layer is placed on top of the flexible waterproof layer and forms an integral part with the flexible waterproof layer to jointly constitute the composite waterproof layer.

5. The waterproof structure at the connection between old and new underground concrete structures according to claim 1, characterized in that: The waterproof sealant (3) is a waterproof sealant, a water-emulsion type acrylic sealant, or a chlorosulfonated polyethylene sealant.

6. The waterproof structure at the connection between old and new underground concrete structures according to claim 1, characterized in that: The new and old structure connection component (4) is also provided with grooves on both sides, and expansion water-stop strips (2) are embedded in the grooves.

7. The waterproof structure at the connection between old and new underground concrete structures according to claim 1, characterized in that: The impermeable material (8) is generally arched.

8. The construction method for the waterproof structure at the connection between old and new underground concrete structures according to claim 1, characterized in that, Includes the following steps: Step 1: Roughen the existing concrete structure (10), clean the existing concrete structure (10) down to the existing waterproof layer, and locate the T-shaped rubber waterstop (1), expansion waterstop strip (2), and the connection components (4) of the new and old structures. Step 2: Grooves are cut at the arc-shaped end of the T-shaped rubber waterstop (1) and the expansion waterstop strip (2) on the original structure, and the T-shaped rubber waterstop (1) and the expansion waterstop strip (2) are embedded into the original structure and fixed in place; Step 3: The new and old structure connection components (4) are fixedly connected to the original structure by expansion bolts. After the reinforcement of the new concrete structure (5) is completed, the threaded head rod (4-2) is screwed into the threaded hole on the plate (4-1). Then, the formwork is erected and the new structure concrete is poured. The back side of the expansion waterstop strip (2) is filled with waterproof sealant. Step 4: Construction of brick formwork (7). The brick formwork is built into an arch shape, and waterproof mortar is applied to the water-facing side. Step 5: After the brick formwork construction is completed, the T-shaped rubber waterstop (1) is tightly attached to the newly built concrete structure (5) and the original structure, and then plain impermeable concrete is poured.

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