Waterproof structure and method for joint of underground new and old concrete structures

Abstract

The invention discloses a waterproof structure for the joint of underground new and old concrete structures. The waterproof structure comprises a T-shaped rubber waterstop, waterproof caulking paste, a new and old structure connecting assembly, a waterproof layer, a brick blank film and an impervious material. The T-shaped rubber waterstop is arranged at the junction of a newly-built concrete structure and an original concrete structure in the vertical direction and the horizontal direction and comprises a horizontal waterstop body and a vertical waterstop body, and one end of the horizontal waterstop body extends into the junction of the newly-built concrete structure and the original concrete structure and is attached to a new and old structure connecting assembly at the junction. The outer end of the vertical waterstop is of an arc-shaped structure which is bent inwards, and the outer end of the horizontal waterstop is of an arc-shaped structure which is bent downwards; the outer side of the T-shaped structure is covered with an anti-seepage material; the end, away from the T-shaped rubber waterstop, of the new and old structure connecting assembly is filled with a waterproof caulking material. The underground water seepage path can be effectively cut off, the overall waterproof performance of the structure is improved, the strength of the connecting part is improved, and construction is convenient.

Description

Technical Field

[0001] The invention belongs to the field of building construction, and in particular relates to a waterproof structure and method for connecting new and old underground concrete structures. Background Art

[0002] In the process of urban construction and maintenance, the public's demand for underground space is getting higher and higher, and the society generally pays more and more attention to the utilization of underground space. A large number of basement renovation projects have emerged, and it is often necessary to connect new and old underground concrete structures. The traditional connection methods have problems such as low connection strength, poor stability, and susceptibility to groundwater. Leakage caused by damage to the construction joint water-stopping system due to factors such as settlement and deformation often occurs in engineering practice. Therefore, the construction joints of the new structures must be waterproofed.

[0003] In the prior art, one method is to deal with construction joints by setting deformation joints. Although this method is economical and reasonable, it may cause the water stop to tear due to uneven settlement of the new and old structures, thereby causing water seepage problems. In addition, formwork is required during the construction process, which may cause construction difficulties when space is limited. Another method is to design a waterproof structure for the junction of the basement expansion building. Although the waterproof effect is improved, the construction process is more complicated, the construction quality is difficult to guarantee, and the actual waterproof effect is not always satisfactory. There is also a design for the waterproof node of the basement exterior wall expansion. Although it solves some waterproof problems, its waterproof structure is easily damaged and has a short service life. Summary of the invention

[0004] In view of the defects of construction safety and quality risks existing in the above-mentioned background technology, 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] In view of the above problems, the technical solution adopted by the present invention is: a waterproof structure for the joint of the new and old underground concrete structures, including a T-shaped rubber water stop, a waterproof caulking paste, a new and old structure connection component, a waterproof layer, a brick tire membrane and an anti-seepage material;

[0006] The T-shaped rubber waterstop is arranged at the vertical and horizontal intersection of the newly built concrete structure and the original concrete structure, including a horizontal waterstop arranged horizontally along the upper surface of the original concrete structure and a vertical waterstop arranged along the side of the newly built concrete structure. One end of the horizontal waterstop extends into the interior of the intersection of the newly built concrete structure and the original concrete structure and fits with the new and old structure connection components at the intersection. 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 structure that bends inward, and the outer end of the horizontal waterstop is an arc structure that bends downward; (the arc structure increases the length of the seepage path of the rubber waterstop and the structure joint, and the non-linear joint can effectively cut off the path of groundwater infiltration)

[0007] The horizontal water stop and the vertical water stop form a T-shaped structure with an outer side covered with an anti-seepage material, and the outer surface of the anti-seepage material is covered with a layer of brick membrane, and the outer surface of the brick membrane is covered with a waterproof layer; (the water stop is attached to the original structure through a waterproof adhesive, which can avoid the problem of water stop breakage caused by structural dislocation to a certain extent, and improve the overall waterproof performance of the structure

[0008] The new-old structure connection component serves to connect the newly built concrete structure with the original concrete structure, and one end of the new-old structure connection component away from the T-shaped rubber waterstop is filled with waterproof caulking material.

[0009] Furthermore, the new-old structure connection assembly includes a plate (such as a steel plate) that is in contact with the horizontal waterstop, a threaded rod embedded in the newly built concrete structure, and an expansion bolt embedded in the original concrete structure; a plurality of threaded holes are arranged on the plate; the threaded rod and the expansion bolts are both connected to the plate through the threaded holes.

[0010] Furthermore, the end of the inwardly curved arc structure is flush with the outer side surface of the newly constructed concrete structure (5); and the end of the downwardly curved arc structure is flush with the outer side surface of the original concrete structure (10).

[0011] Furthermore, the anti-seepage material is plain anti-seepage concrete.

[0012] Further, 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 in sequence, the flexible waterproof layer is a polymer waterproof roll layer, the rigid waterproof layer is a waterproof mortar layer, the waterproof mortar layer is arranged on the flexible waterproof layer, and is integrated with the flexible waterproof layer to form a 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 ability. At the junction of new and old concrete structures underground, due to temperature changes, foundation settlement or earthquakes, the structure may undergo slight deformation. The flexible waterproof layer can adapt to these deformations and avoid cracks and leakage caused by structural deformation).

[0013] Furthermore, the waterproof caulking material is a waterproof caulking paste.

[0014] Furthermore, grooves are provided on both sides of the new-old structure connection assembly, and expansion water stop strips are embedded in the grooves.

[0015] Furthermore, the anti-seepage material is generally round.

[0016] As another aspect of the present invention, it also relates to a construction method of a waterproof structure at a connection between an underground new and old concrete structure, comprising the following steps:

[0017] Step 1: Roughen the original concrete structure, clean the original concrete structure to the original structural waterproof layer, and locate the T-shaped rubber water stop, expansion water stop strip, and the connection components of the new and old structures;

[0018] Step 2: Make grooves at the arc-shaped end of the T-shaped rubber waterstop and the expansion waterstop on the original structure, and embed the T-shaped rubber waterstop and the expansion waterstop into the original structure to fit and fix;

[0019] Step 3: The new and old structural connection components are fixedly connected to the original structure through expansion bolts. After the new structural steel bars are tied, the threaded steel bars are screwed into the threaded holes on the plate, and then the new structural concrete is cast in the formwork. The back side of the expansion water stop strip is filled with waterproof caulking paste;

[0020] Step 4: Brick membrane construction: the brick membrane is built into a round arch shape, and waterproof mortar is constructed on the water-facing side;

[0021] Step 5: After the brick membrane construction is completed, fit the T-shaped rubber waterstop tightly to the new structure and the original structure, and then pour plain anti-seepage concrete.

[0022] The beneficial effects and features of the present invention are:

[0023] (1) The waterproof structure at the joint of the new and old 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 new and old concrete structures is designed to be arc-shaped, which can effectively cut off the path of groundwater infiltration and improve the overall waterproof performance of the structure.

[0024] (2) The waterproof structure at the connection between the new and old underground concrete structures of the present invention is provided; by arranging a connection assembly between 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 in the traditional connection method are solved. The connection assembly between the new and old structures is anchored into the steel bars and steel plates of the new structure through threads, which does not affect the construction of the steel mesh of the new structure, and the construction is convenient.

[0025] (3) The waterproof structure at the connection between the new and old underground concrete structures of the present invention; by designing the brick membrane into a round arch shape, the round arch shape has good stability and can effectively solve the influence of the backfill soil side pressure on the construction joint enclosure structure. It can be directly used as a template structure without dismantling, and the construction is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of a waterproof structure at the connection between new and old underground concrete structures according to a preferred embodiment of the present invention;

[0027] Figure 2 A schematic diagram of a new and old concrete structure connection assembly of a preferred embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the steel plate structure of the new and old structure connection assembly of a preferred embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the structure of a threaded head rod according to a preferred embodiment of the present invention;

[0030] Figure 5 It is a structural schematic diagram of a resistance enhancement structure of a preferred embodiment of the present invention;

[0031] In the figure: 1-T-type rubber waterstop, 2-expansion waterstop, 3-waterproof caulking paste, 4-new and old structure connection components, 4-1-plate, 4-2-threaded head rod, 5-new concrete structure, 6-waterproof layer, 7-brick membrane, 8-anti-seepage material, 9-expansion bolt, 10-original concrete structure, 11-threaded hole, 12-cross bar. DETAILED DESCRIPTION

[0032] 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.

[0033] Please refer to Figure 1The embodiment of the present invention provides a waterproof structure and method for the connection between new and old underground concrete structures. By setting a new and old structure connection assembly at the connection between the new structure and the original structure, the strength of the connection part is increased. The new and old structure connection assembly is anchored into the steel bars and steel plates of the new structure through threads, which does not affect the construction of the steel mesh of the new structure, and the construction is 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 waterstop is not easily affected by the uneven settlement of the new and old structures and breaks, which effectively improves the stability of the waterproof structure. The structure is simple and easy to construct. It can effectively connect the new and old concrete structures, improve the connection strength and waterproof performance, extend the service life of the structure, and effectively solve the hidden dangers of water seepage caused by the settlement of the construction joints of the underground outward expansion structure.

[0034] Please refer to Figure 2-Figure 4 The connection structure includes a T-shaped rubber waterstop 1, an expansion waterstop strip 2, a waterproof caulking paste 3, a new-old structure connection component 4, a steel plate 4-1, a threaded head steel bar 4-2, a new structure 5, a waterproof mortar 6, a brick membrane 7, plain anti-seepage concrete 8, an expansion bolt 9, an original structure 10, and a threaded hole 11.

[0035] The T-shaped rubber waterstop 1 has one end that fits with the new and old structure connection components 4, and the other two ends are designed to be arc-shaped (in addition to the arc shape, it can also be designed to be wavy or serrated to further increase the water penetration resistance. When the wavy or serrated shape is stretched or compressed by external force, it can better disperse the stress, reduce the local stress concentration of the waterstop, and extend the service life of the waterstop). The length of the seepage path of the joint between the rubber waterstop and the structure is increased, and the non-linear joint can effectively cut off the path of groundwater infiltration. The waterstop is bonded to the original structure through a waterproof adhesive, which can avoid the problem of waterstop breakage caused by structural dislocation to a certain extent, thereby improving the overall waterproof performance of the structure.

[0036] The expansion water stop strip 2 is grooved on both sides of the new and old structure connection components 4 on the original structure 10, and the expansion water stop strip 2 is embedded, and the waterproof caulking paste 3 on the back water side is used to fill the seam, so as to improve the waterproof performance of the construction joint between the new and old structures.

[0037] The new-old structure connection component 4 includes a steel plate 4-1 and a threaded steel bar 4-2. The new-old structure connection component 4 is fixedly connected to the original structure 10 by an expansion bolt 9. After the steel bars of the new structure 5 are tied, the threaded steel bar 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.

[0038] The brick membrane 7 is formed into a round arch shape, which has good stability and can effectively solve the influence of the backfill soil side pressure on the construction joint enclosure structure. It can be directly used as a template structure for plain waterproof concrete 8 without dismantling, and the construction is convenient. The brick membrane 7 is provided with a waterproof mortar 6 on the outside.

[0039] Please refer to Figure 5 In some preferred embodiments, a resistance enhancement structure may be provided on the threaded head member 4-2 and the expansion bolt 9 embedded in the original concrete structure, such as a cross bar 12 fixedly connected to the threaded head member or the threaded head member.

[0040] An embodiment of the present invention provides a waterproof structure and method for the connection between new and old underground concrete structures. By arranging a new-old structure connection component at the connection between the new structure and the original structure, the strength of the connection part is increased. The new-old structure connection component is anchored into the steel bars and steel plates of the new structure through threads, which does not affect the construction of the steel mesh of the new structure and is convenient for construction. 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 waterstop is not easily affected by the uneven settlement of the new and old structures and thus breaks, thereby effectively improving the stability of the waterproof structure.

[0041] 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 hidden dangers of water seepage caused by problems such as settlement of construction joints of underground expansion structures.

[0042] The above shows and describes 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, and the above embodiments and descriptions are only for explaining the structural relationship and principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A waterproof structure for the joint of new and old underground concrete structures, characterized in that : It comprises a T-shaped rubber water stop (1), a waterproof caulking paste (3), a new and old structure connection component (4), a waterproof layer (6), a brick membrane (7) and an anti-seepage material (8); The T-shaped rubber water stop (1) is arranged at the vertical and horizontal intersection of the newly built concrete structure (5) and the original concrete structure (10), and includes a horizontal water stop (11) arranged horizontally along the upper surface of the original concrete structure (10) and a vertical water stop (12) arranged along the side of the newly built concrete structure (5). One end of the horizontal water stop (11) extends into the interior of the intersection of the newly built concrete structure (5) and the original concrete structure (10) and fits with the new and old structure connection components (4) at the intersection. The horizontal water stop (11) and the vertical water stop (12) form a T-shaped structure as a whole. The outer end of the vertical water stop (12) is an arc structure that bends inward, and the outer end of the horizontal water stop (11) is an arc structure that bends downward. The horizontal water stop strip (11) and the vertical water stop strip (12) form a T-shaped structure as a whole, and the outer side of the water stop strip (8) is covered with an anti-seepage material (8), and the outer surface of the anti-seepage material (8) is covered with a layer of brick membrane (7), and the outer surface of the brick membrane (7) is covered with a waterproof layer (6); The new-old structure connection component 4 serves to connect the newly constructed concrete structure (5) and the original concrete structure (10), and the end of the new-old structure connection component 4 away from the T-shaped rubber waterstop is filled with waterproof caulking material (3).

2. The waterproof structure for the joint of underground new and old concrete structures according to claim 1 is characterized by: The new-old structure connection assembly (4) comprises a plate (4-1) fitted with a horizontal water stop (11), a threaded rod (4-2) embedded in a newly built concrete structure (5), and an expansion bolt (9) embedded in an existing concrete structure (10); a plurality of threaded holes (11) are provided on the plate (4-1); the threaded rod (4-2) and the expansion bolt (9) are both connected to the plate (4-1) via the threaded holes (11).

3. The waterproof structure for the joint of underground new and old concrete structures according to claim 1 is characterized by: The end of the inwardly curved arc structure is flush with the outer side surface of the newly built concrete structure (5); and the end of the downwardly curved arc structure is flush with the outer side surface of the original concrete structure (10).

4. The waterproof structure for the joint of underground new and old concrete structures according to claim 1 is characterized by: The anti-seepage material is plain anti-seepage concrete.

5. The waterproof structure for the joint of underground new and old concrete structures according to claim 1 is characterized by: The waterproof layer (6) is a waterproof mortar or a composite waterproof layer; the composite waterproof layer comprises a flexible waterproof layer and a rigid waterproof layer stacked in sequence, the flexible waterproof layer is a polymer waterproof roll material layer, the rigid waterproof layer is a waterproof mortar layer, the waterproof mortar layer is arranged on the flexible waterproof layer, and is integrated with the flexible waterproof layer to form a composite waterproof layer.

6. The waterproof structure for the joint of underground new and old concrete structures according to claim 1 is characterized by: The waterproof caulking material (3) is a waterproof caulking paste or a water-emulsion type acrylic sealing paste or a chlorosulfonated polyethylene sealing paste.

7. The waterproof structure for the joint of underground new and old concrete structures according to claim 1 is characterized by: Grooves are also provided on both sides of the new-old structure connection assembly 4, and expansion water stop strips (2) are embedded in the grooves.

8. The waterproof structure for the joint of underground new and old concrete structures according to claim 1 is characterized by: The anti-seepage material (8) is generally round.

9. The construction method of waterproof structure at the joint of underground new and old concrete structures according to claim 1, characterized in that: The steps include: Step 1: roughening the original concrete structure (10), cleaning the original concrete structure (10) to the original structural waterproof layer, and positioning the T-shaped rubber water stop strip (1), the expansion water stop strip (2), and the new and old structure connection components (4); Step 2: grooves are cut at the arc-shaped end of the T-shaped rubber water stop (1) and the expansion water stop strip (2) on the original structure, and the T-shaped rubber water stop (1) and the expansion water stop strip (2) are embedded into the original structure to fit and fix; 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 structure (5) is tied, the threaded head reinforcement 4-2 is screwed into the threaded hole on the plate (4-1), and then the new structure concrete is cast in the formwork. The expansion water stop strip (2) is filled with waterproof caulking paste on the back side of the water; Step 4: Construction of brick membrane (7), brick membrane is built into a round arch shape, and waterproof mortar (6) is constructed on the water-facing side; Step 5: After the brick membrane construction is completed, the T-shaped rubber water stop (1) is tightly attached to the new structure (5) and the original structure, and then plain impermeable concrete is poured.

Images