A waterproofing and water-stopping method for cold joints of new and old structures

Abstract

The present invention discloses a waterproofing and water-stopping method for cold joints of new and old structures, comprising: step 1: treating the base surface of the construction joint; step 2: cutting the groove; step 3: applying the matching glue for fixing; step 4: fixing the slot-type polymer waterproof and anti-corrosion water-stopping strip; step 5: longitudinally connecting the slot-type polymer waterproof and anti-corrosion water-stopping strip; step 6: transition of the corner part; step 7: pouring the concrete of the new structure; step 8: overlapping the outer waterproof layer. The present invention provides a waterproofing and water-stopping method for cold joints of new and old structures, wherein the water-stopping strip has good low-temperature flexibility, heat resistance, heat aging resistance, acid and alkali corrosion resistance, its outer polymer coating has strong bonding strength with the post-cast concrete, and the peeling strength with the post-cast concrete is not less than 0.45Mpa, which can effectively resist the external water pressure and play a waterproof effect.

Description

Technical Field

[0001] The present invention relates to the technical field of civil engineering, and more specifically, to a waterproofing and water-stopping method for cold joints of new and old structures. Background Art

[0002] With the continuous advancement of urbanization, urban development is changing with each passing day. In order to alleviate the contradiction between urban space development and the shortage of available land resources, underground space development has entered a period of rapid development, and the problem of water leakage has continued to increase. Whether it is a basement of a civil building or underground projects such as a pipe gallery and subway, water leakage often occurs in construction joints, deformation joints, structural cracks, and cold joints of new and old structures. Among them, the cold joints of new and old structures cannot be pre-buried with embedded water-stopping components, and the water-stopping measures are limited. It has become a weak point in engineering waterproofing, and basically nine out of ten joints leak. Long-term water leakage not only affects the durability of the structure and shortens its service life, but also reduces its use function and affects people's normal life.

[0003] At present, the common waterproofing measures for cold joints of new and old structures are double-channel water-expanding waterstop strips (glue) + grouting pipes. Grouting pipes cannot be injected due to deformation and blockage during construction, and the grouting effect cannot be achieved. Water-expanding waterstop glue or waterstop strips are not installed continuously, are easy to fall off, and swell in water in advance, which makes it difficult to play a water-blocking role, resulting in frequent water leakage in this area.

[0004] Therefore, it is necessary to propose a waterproof and water-stopping method for cold joints of new and old structures to at least partially solve the problems existing in the prior art. Summary of the invention

[0005] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0006] In order to at least partially solve the above problems, the present invention provides a waterproof and water-stopping method for cold joints of new and old structures, comprising:

[0007] Step 1: Treat the base surface of the construction joint;

[0008] Step 2: Cut the groove;

[0009] Step 3: Apply the matching glue for fixing;

[0010] Step 4: Fix the slot-type polymer waterproof and anti-corrosion waterstop;

[0011] Step 5: Longitudinally connect the slot-type polymer waterproof and anti-corrosion waterstop;

[0012] Step 6: Corner transition;

[0013] Step 7: Pour concrete for the new structure;

[0014] Step 8: Overlap the outer waterproof layer.

[0015] According to the waterproofing and water-stopping method for cold joints of new and old structures of the embodiment of the present invention, in the above step 1, the base surface of the old structure construction joint within the middle 50mm range is not roughened, and the pores, unevenness, honeycombs, gaps, and sand in this part should be repaired and leveled with epoxy mortar, and the rest of the base surface is roughened, and the construction joint section is brushed with water 1.5kg / m 2 Cement-based penetrating crystallization waterproof coating, the base surface becomes rough after roughening, with slightly exposed coarse sand, the surface of the base layer should be solid, without floating dust, peeling and loose parts. The base surface should be kept moist before applying cement-based penetrating crystallization waterproof coating, and the coating should be applied evenly in two coats, with the coating direction perpendicular to the two coats. Sufficient maintenance should be carried out after each coat.

[0016] According to the waterproofing and water-stopping method for cold joints of old and new structures in an embodiment of the present invention, in the above step 2, a groove is cut out in the middle of the base surface of the construction joint of the old structure. The groove depth is generally 30 mm (the thickness of the steel bar protective layer) and the width is 5 to 10 mm. After the groove is cut out, the debris and floating dust should be cleaned up. The depth of the groove shall not exceed the thickness of the steel bar protective layer to avoid damaging the structural steel bars.

[0017] According to the waterproofing and waterstopping method for cold joints of new and old structures in an embodiment of the present invention, in the above step 3, the fixed end and the snap-in end of the slot-type polymer waterproof and anti-corrosion waterstop are fully coated with matching glue for fixing, and the thickness of the glue layer is not less than 10 mm.

[0018] According to the waterproofing and waterstopping method for cold joints of old and new structures in an embodiment of the present invention, in the above step 4, the base surface of the construction joint needs to be coated with primer before fixing the waterstop strip. Only after the base oil is completely dry can the snap-in end of the slot-type polymer waterproof and anti-corrosion waterstop strip be inserted into the slot removed in step 2, and then the waterstop strip is fixed at the fixed end with bolts. The longitudinal spacing between the bolts should not be greater than 2 meters. Each section of the waterstop strip has at least two bolts. After the bolt construction is completed, the bolt head should be covered with matching glue for connection.

[0019] According to the waterproofing and waterstopping method for cold joints of new and old structures in an embodiment of the present invention, in the above step 5, each section of the slot-type polymer waterproof and anti-corrosion waterstop is about 3m long, and is overlapped longitudinally with an L-shaped matching connecting plate and matching glue for connection, and rivets are used for auxiliary fixation at the overlap joints, and the rivet heads are covered with matching glue. The length of the matching connecting plate is not less than 200mm, and the material and thickness are the same as those of the slot-type polymer waterproof and anti-corrosion waterstop.

[0020] According to the waterproofing and waterstopping method for cold joints of new and old structures in the embodiment of the present invention, in the above step 6, the corners of the horizontal slot-type polymer waterproof and anti-corrosion waterstop and the vertical slot-type polymer waterproof and anti-corrosion waterstop are transitioned by using matching corner joints; the matching corner joints are also fixed to the construction joint base surface using matching glue and bolts.

[0021] According to the waterproofing and waterstopping method for cold joints of new and old structures in an embodiment of the present invention, in the above step 7, the concrete at the location of the slot-type polymer waterproof and anti-corrosion waterstop should be fully vibrated to ensure that the waterstop and the concrete are tightly engaged, and the vibrating rod must not contact the slot-type polymer waterproof and anti-corrosion waterstop during vibration.

[0022] According to the waterproofing and water-stopping method for cold joints between old and new structures in an embodiment of the present invention, the waterproofing membrane of the existing structure is cleaned, and the existing retaining piles (walls) at the interface are leveled with polymer cement waterproof mortar; the overlapping area between the new structure's external waterproof layer and the old structure's external waterproof layer is fully coated with non-curing rubber asphalt waterproof coating for transition.

[0023] Compared with the prior art, the present invention has at least the following beneficial effects:

[0024] 1. The present invention provides a waterproof and water-stopping method for cold joints of new and old structures. The slot-type polymer waterproof and anti-corrosion waterstop uses a slot-type steel plate or resin plate or other materials with good rigidity and tensile properties as the core material, and is formed by wrapping the polymer waterproof and anti-corrosion material 360 degrees on the outside. The total thickness of the waterstop is not less than 3mm, of which the core material thickness is not less than 1mm, and the single-layer coating thickness is not less than 1mm. The length of the snap-in end is 25mm, the length of the fixed end is 50mm, and the length of the free end is 140mm. The waterstop has good low-temperature flexibility, heat resistance, heat aging resistance, acid and alkali corrosion resistance, and its outer polymer coating has strong adhesion to the post-cast concrete, and the peeling strength with the post-cast concrete is not less than 0.45Mpa, which can effectively resist external water pressure and achieve a waterproof effect.

[0025] 2. The slot-type polymer waterproof and anti-corrosion waterstop can be pasted on the concrete surface and has good adhesion with the concrete, effectively solving the problem that the embedded waterstop cannot be pre-buried in the cold joint area.

[0026] 3. The simple lap joint form and customizable product of the slot-type polymer waterproof and anti-corrosion waterstop can effectively solve the transition of joints in complex areas and effectively solve the problem of water leakage in the joints.

[0027] 4. The connecting adhesive used for the longitudinal connection of the slot-type polymer waterproof and anti-corrosion waterstop should have good low-temperature flexibility, heat resistance, heat aging resistance, acid and alkali corrosion resistance, and low water absorption. The lap shear strength of the waterstop after connection should not be less than 4N / mm.

[0028] 5. The supporting glue used to fix the slot-type polymer waterproof and anti-corrosion waterstop should have good impermeability, the colloid's bending strength should be no less than 17Mpa, and the compressive shear bonding strength should be no less than 13Mpa, which can effectively fix the slot-type polymer waterproof and anti-corrosion waterstop on the construction joint base for a long time.

[0029] The waterproofing and water-stopping method for cold joints of new and old structures described in the present invention, and other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will also be understood by technical personnel in the field through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0031] Figure 1 It is a flow chart of the novel waterproof and water-stopping method of the present invention.

[0032] Figure 2 This is a diagram of the construction of the new waterproof and water-stopping structure of the present invention.

[0033] Figure 3 This is a large-scale drawing of the slot-type polymer waterproof and anti-corrosion waterstop of the present invention.

[0034] Figure 4 This is a diagram of the construction joint base surface treatment method of the present invention.

[0035] Figure 5 This is a large-scale drawing of the corner transition node of the slot-type polymer waterproof and anti-corrosion waterstop of the present invention.

[0036] Figure 6 This is a large-scale drawing of the L-shaped matching connecting plate used for connecting the waterstop strip of the present invention.

[0037] Figure 7 This is a diagram of the waterstop joint connection method of the present invention.

[0038] Figure 8 This is a diagram of the gluing and bolt fixing method of the present invention.

[0039] Figure numerals: 1. old structure; 2. new structure; 3. slot-type polymer waterproof and anti-corrosion waterstop; 4. cement-based penetrating crystallization waterproof coating; 5. matching glue for fixing; 6. bolt; 7. notch; 8. free end; 9. snap-in end; 10. fixed end; 11. core material; 12. single-layer coating; 13. matching glue for connection; 14. L-shaped matching connecting plate; 15. non-curing rubber asphalt waterproof coating; 16. polymer cement waterproof mortar 17. waterproof layer of old structure; 18. waterproof layer of new structure; 19. enclosure structure; 20. corner joint; 21. roughening of base surface; 22. no roughening of base surface; 23. rivet. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments so that those skilled in the art can implement the invention with reference to the description.

[0041] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0042] like Figure 1-Figure 2 As shown, the present invention provides a waterproofing and water-stopping method for cold joints of new and old structures, comprising: step 1: treating the base surface of the construction joint;

[0043] Step 2: Cut the groove;

[0044] Step 3: Apply the matching glue for fixing;

[0045] Step 4: Fix the slot-type polymer waterproof and anti-corrosion waterstop;

[0046] Step 5: Longitudinally connect the slot-type polymer waterproof and anti-corrosion waterstop;

[0047] Step 6: Corner transition;

[0048] Step 7: Pour concrete for the new structure;

[0049] Step 8: Overlap the outer waterproof layer.

[0050] Furthermore, in the above step 1, the middle 50mm of the base surface of the construction joint of the old structure 1 is not roughened, and the pores, unevenness, honeycombs, gaps, and sand in this part should be repaired and leveled with epoxy mortar. The rest of the base surface is roughened 21, and the construction joint section is brushed with water 1.5kg / m 2 Cement-based penetrating crystallization waterproof coating 4, the base surface becomes rough after roughening, with slightly exposed coarse sand, the surface of the base layer should be solid, without floating dust, peeling and loose parts, the base surface should be kept moist before applying cement-based penetrating crystallization waterproof coating 4, apply it evenly in two coats, with the brushing direction perpendicular to the two coats, and fully maintain it after each coat.

[0051] Furthermore, in the above step 2, a groove is cut out in the middle of the base surface of the construction joint of the old structure 1. The depth of the groove 7 is generally 30 mm (the thickness of the steel bar protective layer) and the width is 5 mm. After the groove is cut out, the debris and floating dust should be cleaned up. The depth of the groove shall not exceed the thickness of the steel bar protective layer to avoid damaging the structural steel bars.

[0052] Furthermore, in the above step 3, the fixing end 10 and the inserting end 9 of the slot-type polymer waterproof and anti-corrosion waterstop 3 are fully coated with the fixing matching glue 5, and the thickness of the glue layer is not less than 10 mm.

[0053] Furthermore, in the above step 4, the base surface of the construction joint needs to be painted with primer before fixing the water stop. After the primer is completely dry, the insertion end 9 of the slot-type polymer waterproof and anti-corrosion water stop 3 can be inserted into the notch 7 cut out in step 2, and then the water stop is fixed with bolts 6 at the fixed end 10. The longitudinal spacing of the bolts 6 should not be greater than 2 meters, and each section of the water stop should have at least two bolts. After the construction of the bolts 6 is completed, the bolt heads should be covered with matching glue for connection.

[0054] Furthermore, in the above step 5, each section of the slot-type polymer waterproof and anti-corrosion waterstop 3 is about 3m long, and is overlapped longitudinally with an L-shaped matching connecting plate 14 and a matching adhesive 13, and rivets 23 are used to assist in fixation at the overlap joints, and the rivet heads are covered with matching adhesive. The length of the matching connecting plate is not less than 200mm, and the material and thickness are the same as those of the slot-type polymer waterproof and anti-corrosion waterstop 3.

[0055] Furthermore, in the above step 6, the corners of the horizontal slot-type polymer waterproof and anti-corrosion waterstop and the vertical slot-type polymer waterproof and anti-corrosion waterstop are transitioned using a matching corner joint 20; the matching corner joint 20 is also fixed to the construction joint base surface using matching glue 5 and bolts 6.

[0056] Furthermore, in the above step 7, the concrete at the location of the slot-type polymer waterproof and anti-corrosion waterstop 3 should be fully vibrated to ensure that the waterstop and the concrete are tightly engaged, and the vibrating rod must not contact the slot-type polymer waterproof and anti-corrosion waterstop 3 during vibration.

[0057] Furthermore, the waterproof membrane of the existing structure is cleaned, and the existing retaining piles (walls) at the interface are leveled with polymer cement waterproof mortar 16; the overlapping area of ​​the new structure waterproof layer 18 and the old structure waterproof layer 17 is fully coated with non-curing rubber asphalt waterproof coating 15 for transition.

[0058] like Figure 3 As shown, the card slot type polymer waterproof anti-corrosion water stop strip is a large sample. The total thickness of the water stop strip is not less than 3mm, of which the core material 11 is not less than 1mm thick, and the single layer coating 12 is not less than 1mm thick. The length of the card end 9 is 25mm, the length of the fixed end 10 is 50mm, and the length of the free end 8 is 140mm.

[0059] like Figure 4 As shown in the figure, the construction joint base surface treatment method diagram. The base surface of the fixed water stop belt range does not need to be roughened 22, and the base surface of other places must be roughened 21.

[0060] like Figure 5 As shown in the figure, the large-scale drawing of the corner transition node of the slot-type polymer waterproof and anti-corrosion waterstop. The corner transition node is a customizable joint form, and the joints of the top plate, bottom plate and side wall waterstop are connected by overlapping.

[0061] like Figure 6 As shown in the figure, the L-shaped matching connecting plate for connecting the water stop is a large-scale drawing. The material, thickness, and dimensions of the free end 8 and the fixed end 10 of the L-shaped matching connecting plate are the same as those of the polymer waterproof and anti-corrosion water stop, and the length of the component is not less than 200mm.

[0062] like Figure 7 The polymer waterproof and anti-corrosion waterstop joint is connected to the waterstops on both sides by L-shaped matching connecting plate 14, using matching glue 13 for connection, and then fixed by rivets 23 on both sides.

[0063] like Figure 8 As shown in the figure, the glue coating and bolt fixing method. Before fixing the water stop, the base surface of the construction joint needs to be coated with primer. After the primer is completely dry, the slot-type polymer waterproof and anti-corrosion water stop 3 is pasted on the concrete base surface by fixing with matching glue 5. The water stop and the concrete base surface need to achieve full adhesion. The gap is sealed with matching glue. At the same time, the two ends of the water stop are fixed with bolts 6, and the bolt heads are sealed with matching glue 5.

[0064] From the above content, it can be seen that the new set of waterproof measures for special construction joints of the present invention has the following effects:

[0065] 1. The present invention provides a waterproof and water-stopping method for cold joints of new and old structures. The slot-type polymer waterproof and anti-corrosion waterstop uses a slot-type steel plate or resin material or other materials with good rigidity and ductility as the core material, and is formed by wrapping the polymer waterproof and anti-corrosion material 360 degrees on the outside. The total thickness of the waterstop is not less than 3mm, of which the core material thickness is not less than 1mm, and the single-layer coating thickness is not less than 1mm. The length of the snap-in end is 25mm, the length of the fixed end is 50mm, and the length of the free end is 140mm. The waterstop has good low-temperature flexibility, heat resistance, heat aging resistance, acid and alkali corrosion resistance, and its outer polymer coating has strong adhesion to the post-cast concrete, and the peeling strength with the post-cast concrete is not less than 0.45Mpa, which can effectively resist external water pressure and achieve a waterproof effect.

[0066] 2. The slot-type polymer waterproof and anti-corrosion waterstop can be pasted on the concrete surface and has good adhesion with the concrete, effectively solving the problem that the embedded waterstop cannot be pre-buried in the cold joint area.

[0067] 3. The simple lap joint form and customizable product of the slot-type polymer waterproof and anti-corrosion waterstop can effectively solve the transition of joints in complex areas and effectively solve the problem of water leakage in the joints.

[0068] 4. The connecting adhesive used for the longitudinal connection of the slot-type polymer waterproof and anti-corrosion waterstop should have good low-temperature flexibility, heat resistance, heat aging resistance, acid and alkali corrosion resistance, and low water absorption. The lap shear strength of the waterstop after connection should not be less than 4N / mm.

[0069] 5. The supporting glue used to fix the slot-type polymer waterproof and anti-corrosion waterstop should have good impermeability, the colloid's bending strength should be no less than 17Mpa, and the compressive shear bonding strength should be no less than 13Mpa, which can effectively fix the slot-type polymer waterproof and anti-corrosion waterstop on the construction joint base for a long time.

[0070] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0071] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0072] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A waterproofing and water stopping method for cold joints of new and old structures, characterized in that: include: Step 1: Treat the base surface of the construction joint; Step 2: Cut the groove; Step 3: Apply the matching glue for fixing; Step 4: Fix the slot-type polymer waterproof and anti-corrosion waterstop; Step 5: Longitudinally connect the slot-type polymer waterproof and anti-corrosion waterstop; Step 6: Corner transition; Step 7: Pour concrete for the new structure; Step 8: Overlap of outer waterproof layer; The slot-type polymer waterproof and anti-corrosion waterstop has a fixed end, a snap-in end and a free end. In the above step 3, the fixed end and the snap-in end of the slot-type polymer waterproof and anti-corrosion waterstop are fully coated with a matching glue for fixing, and the thickness of the glue layer is not less than 10 mm. In the above step 4, the base surface of the construction joint is painted with primer before the waterstop is fixed. After the base oil is completely dry, the card-in end of the slot-type polymer waterproof and anti-corrosion waterstop can be inserted into the slot removed in step 2, and then the waterstop is fixed with bolts at the fixed end. The longitudinal spacing of the bolts is not more than 2 meters, and each section of the waterstop has at least two bolts. After the bolt construction is completed, the bolt head is covered with a matching glue for connection; In the above step 5, each section of the slot-type polymer waterproof and anti-corrosion waterstop is about 3m long, and is overlapped longitudinally with an L-shaped matching connecting plate and matching glue, and rivets are used to assist in fixing at the overlap joints. The rivet heads are covered with matching glue, and the length of the matching connecting plate is not less than 200mm, and the material and thickness are the same as those of the slot-type polymer waterproof and anti-corrosion waterstop.

2. The waterproofing and water stopping method for cold joints of new and old structures according to claim 1 is characterized in that: In the above step 1, the 50mm in the middle of the base surface of the old structure construction joint is not roughened. The pores, unevenness, honeycombs, gaps and sand in this area are repaired and leveled with epoxy mortar. The rest of the base surface is roughened and the construction joint section is brushed with water at 1.5kg / m 2 Cement-based penetrating crystallization waterproof coating, the base surface becomes rough after roughening, with coarse sand slightly exposed, the surface of the base layer is solid, without floating dust, peeling and loose parts. The base surface should be kept moist before applying cement-based penetrating crystallization waterproof coating, and the coating should be applied evenly in two coats, with the coating direction perpendicular to the two coats, and sufficient maintenance should be carried out after each coat.

3. The waterproofing and water stopping method for cold joints of new and old structures according to claim 1 is characterized in that: In the above step 2, a groove is cut out in the middle of the base surface of the old structure construction joint. The groove has a depth of 30mm and a width of 5~10mm. After cutting the groove, clean up the debris and floating dust. The depth of the groove must not exceed the thickness of the steel bar protective layer to avoid damaging the structural steel bars.

4. The waterproofing and water stopping method for cold joints of new and old structures according to claim 1 is characterized in that: In the above step 6, the corners of the horizontal slot-type polymer waterproof and anti-corrosion waterstop and the vertical slot-type polymer waterproof and anti-corrosion waterstop are transitioned using matching corner joints; the matching corner joints are also fixed to the construction joint base surface using matching glue and bolts.

5. The waterproofing and water stopping method for cold joints of new and old structures according to claim 1 is characterized in that: In the above step 7, the concrete at the location of the slot-type polymer waterproof and anti-corrosion waterstop is fully vibrated to ensure that the waterstop and the concrete are tightly engaged. During the vibration, the vibrating rod must not contact the slot-type polymer waterproof and anti-corrosion waterstop.

6. The waterproofing and water stopping method for cold joints of new and old structures according to claim 1 is characterized in that: Clean the waterproof membrane of the existing structure, and use polymer cement waterproof mortar to level the existing retaining piles at the interface; the overlapping area between the new structure's external waterproof layer and the old structure's external waterproof layer is fully coated with non-curing rubber asphalt waterproof coating for transition.

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