New and old concrete connecting structure

Abstract

The utility model belongs to the technical field of new and old concrete connection, and particularly relates to a new and old concrete connection structure which comprises new concrete, old concrete, grooves, embedded steel bars, water stop belts and embedded steel bar holes. A groove is formed in the position, where the water stop belt is pre-placed, of the old concrete, and a plurality of steel bar planting holes are evenly formed in the groove in the length direction of the connecting seam; one end of the embedded steel bar is arranged in the embedded steel bar hole, and the other end of the embedded steel bar extends into the groove; the water-stop belt is arranged along the connecting seam, one side edge of the water-stop belt is fixed in the new concrete, and the other side edge of the water-stop belt is arranged in the groove and is fixed by filling the groove with fine aggregate concrete; the part, in the groove, of the water stop belt is located above the embedded steel bars; and the connecting seam is filled with a foam plate and is sealed by a sealant. According to the new and old concrete connecting structure, the reinforcing steel bars are implanted into the old concrete, so that the connecting strength of the water-stop belt and the old concrete is enhanced, and the water-stop belt is not prone to falling off in the old concrete. And the anti-seepage effect of the connecting part of new and old concrete is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of new-old concrete connection, in particular to a new-old concrete connection structure. Background Art

[0002] With the rapid growth of the national economy, the country's investment in water conservancy has gradually increased. In order to ensure the safety of people's property on both sides of the river, the standard of river management has been improved from time to time. Some buildings are still in good structure and can be used. It is a waste to demolish and rebuild them. Therefore, the design expands the original buildings; therefore, the connection between the new and old concrete is a problem that water conservancy designers must face. If it is not handled properly, it will cause leakage and affect the structural safety.

[0003] The existing joints between new and old concrete are filled with polysulfide sealant or water-swelling rubber strips. Due to the settlement difference between the two parts of concrete, this connection method is prone to damage at the connection point and has a poor anti-seepage effect. There is also a method of cutting grooves in the old concrete structure and re-burying the waterstop, but the connection between the concrete filled in the groove and the old concrete is not good, which easily forms a weak link in anti-seepage. There is also an "L"-shaped waterstop arrangement connection method, but this connection method bends the waterstop, which reduces the service life of the waterstop, and this method is more suitable for rubber waterstops, but not for copper waterstops.

[0004] Therefore, based on the above problems, an effective connection structure is provided to bury the waterstop in the old concrete to connect the new and old concrete, which can not only ensure the service life of the waterstop, but also ensure the connection strength between the new and old concrete, and maximize the anti-seepage and water-stopping effect of the waterstop. Utility Model Content

[0005] In view of the problems existing in the prior art, the utility model provides a new and old concrete connection structure, the purpose of which is to connect the new and old concrete and maximize the anti-seepage and water-stopping effect of the waterstop.

[0006] The utility model is achieved in this way:

[0007] A new-old concrete connection structure includes new concrete and old concrete, with a connection seam between the two; and also includes a groove, a reinforcement, a water stop and a reinforcement hole;

[0008] The old concrete is provided with a groove at the position where the water stop is pre-placed, and a plurality of rebar holes are provided on the side of the groove away from the joint, and all the rebar holes are evenly arranged along the length direction of the joint; one end of the rebar is arranged in the rebar hole and is filled and fixed by rebar glue, and the other end of the rebar extends to the inside of the groove;

[0009] The water stop is arranged along the joint, one side of the water stop is fixed in the new concrete, and the other side is placed in the groove, and the water stop is fixed in the old concrete by filling the groove with fine stone concrete; the part of the water stop in the groove is located above the embedded steel bar, and the water stop does not contact the embedded steel bar;

[0010] The connection seam between the new concrete and the old concrete is filled with a foam board, and the water-facing end of the connection seam is sealed by a sealant.

[0011] As a preferred technical solution, the dimension of the groove in the depth direction of the connecting seam is 20 cm, and the dimension of the groove in the width direction of the connecting seam is 25 cm.

[0012] As a preferred technical solution, the diameter of the anchor hole is 2 cm, the dimension in the width direction of the connection seam is 25 cm, and the distance between adjacent anchor holes is 20 cm.

[0013] As a preferred technical solution, the distance between the water stop strip in the groove and the embedded reinforcement is greater than 1 cm.

[0014] As a preferred technical solution, the fine stone concrete is C40 water-based epoxy resin fine stone concrete and is mixed with 8% of an expansion agent.

[0015] As a preferred technical solution, the thickness of the foam board is consistent with the width of the connecting seam.

[0016] As a preferred technical solution, the foam board is a polyethylene foam board, and the thickness of the foam board is 2 cm.

[0017] As a preferred technical solution, the sealant is polysulfide sealant, and the size of the sealant in the width direction of the connection seam on the water-facing surface is 2-4 cm, and the size in the depth direction of the connection seam is 2-4 cm.

[0018] The utility model has the following advantages and technical effects:

[0019] The new and old concrete connection structure of the utility model has a groove provided at the position where the water stop is pre-placed in the old concrete, and a number of rebar holes are evenly provided in the groove along the length direction of the connection joint; one end of the rebar is arranged in the rebar hole and is filled and fixed by rebar glue, and the other end of the rebar extends to the inside of the groove; the water stop is arranged along the connection joint, one side of the water stop is fixed in the new concrete, and the other side is placed in the groove, and the water stop is fixed in the old concrete by filling the groove with fine stone concrete; the part of the water stop in the groove is located above the rebar, and the water stop is not in contact with the rebar; the connection joint between the new concrete and the old concrete is filled with a foam board, and the end of the water-facing surface of the connection joint is sealed by a sealant. The utility model enhances the connection strength between the water stop and the old concrete by implanting steel bars in the old concrete, so that the water stop is not easy to fall off in the old concrete, and the anti-seepage effect of the connection part between the new and old concrete is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional view of the new and old concrete connection structure of the utility model;

[0021] Figure 2 It is a cross-sectional view of the reinforcing bar implantation part of the utility model.

[0022] In the figure: 1. New concrete; 2. Old concrete; 3. Groove; 4. Anchor bolts; 5. Fine stone concrete; 6. Water stop; 7. Foam board; 8. Sealant; 9. Anchor bolt holes; 10. Anchor bolt glue. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail in combination with the embodiments below. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0024] like Figure 1-2 As shown, the utility model discloses a new-old concrete connection structure, including new concrete 1 and old concrete 2, with a connection seam between the two; and also includes a groove 3, a reinforcement 4, a water stop 6 and a reinforcement hole 9;

[0025] The old concrete 2 is provided with a groove 3 at the position of the pre-installed waterstop 6, and a plurality of anchor holes 9 are provided on the side of the groove 3 away from the connection joint, and all the anchor holes 9 are evenly arranged along the length direction of the connection joint; one end of the anchor 4 is arranged in the anchor hole 9 and is filled and fixed by anchor glue 10, and the other end of the anchor 4 extends to the inside of the groove 3; the waterstop 6 is arranged along the connection joint, one side of the waterstop 6 is fixed in the new concrete 1, and the other side is placed in the groove 3, and the waterstop 6 is fixed in the old concrete 2 by filling the groove 3 with fine stone concrete 5; the part of the waterstop 6 in the groove 3 is located above the anchor 4, and the waterstop 6 does not contact the anchor 4.

[0026] The groove 3 cooperates with the water stop strip 6 to ensure that the side edge of the water stop strip 6 is placed inside the groove 3 and the water stop strip 6 does not contact the side wall of the groove 3 .

[0027] Preferably, the dimension of the groove 3 in the depth direction of the connection seam is 20 cm, and the dimension in the width direction of the connection seam is 25 cm.

[0028] The diameter of the anchor hole 9 is 2 cm, and the dimension in the width direction of the connection seam is 25 cm, ensuring that the anchor 4 can be fixed in the anchor hole 9; the anchor holes 9 are evenly arranged in the length direction of the connection seam, and the distance between adjacent anchor holes 9 is 20 cm. If there are original stress-bearing bars in the old concrete 2, the hole position of the anchor hole 9 can be appropriately adjusted to avoid the original stress-bearing bars to ensure that the overall strength is not affected.

[0029] One end of the anchor bar 4 is inserted into and contacts the deepest part of the anchor bar hole 9 , and the anchor bar glue 10 is used to fill the anchor bar hole 9 to ensure the connection strength between the anchor bar 4 and the old concrete 2 .

[0030] Preferably, the length of the embedded bar 4 is greater than 25 cm and less than 50 cm, ensuring that the embedded bar 4 is fixed in the embedded bar hole 9 to the greatest extent, while not exceeding the groove 3 to affect the filling of the connection seam.

[0031] Further preferably, the embedded reinforcement 4 is made of grade 3 steel with a diameter of 16 mm. Grade 3 steel has the advantages of high strength-to-yield ratio, excellent cold bending performance, and good stability and connection strength.

[0032] The portion of the waterstop 6 placed in the groove 3 is installed with the aid of template embedding to prevent the waterstop 6 from contacting the embedded reinforcement 4 during the fixing process, thereby affecting the connection effect; the portion of the waterstop 6 placed in the groove 3 is fixed by fine stone concrete 5.

[0033] The distance between the water stop 6 and the anchor bar 4 in the groove 3 is greater than 1 cm. If the distance between the water stop 6 and the anchor bar 4 is too small or the two are in contact, it does not meet the construction requirements and affects the strength of the anchor bar 4 after being fixed.

[0034] The fine stone concrete (5) is C40 water-based epoxy resin fine stone concrete and is mixed with 8% of an expansion agent to improve the performance of the fine stone concrete 5.

[0035] The water stop strip 6 excludes the part inside the old concrete 2 and the part inside the connection seam, and the new concrete 1 is cast to fix the new concrete 1 to the water stop strip 6 .

[0036] The connection seam between the new concrete 1 and the old concrete 2 is filled with a foam board 7, and a sealant 8 is used to seal the water-facing end of the connection seam.

[0037] Preferably, the thickness of the foam board 7 is consistent with the width of the connection seam to reduce the occurrence of water seepage.

[0038] Further preferably, the foam board 7 is a polyethylene foam board with a thickness of 2 cm.

[0039] Preferably, the sealant 8 is polysulfide sealant, and the dimension of the sealant 8 in the width direction of the connection seam on the water-facing surface is 2-4 cm, and the dimension in the depth direction of the connection seam is 2-4 cm, to ensure that the sealant 8 seals the connection seam well and avoids seepage.

[0040] The construction method steps adopted by the utility model are as follows:

[0041] Determine the position of the pre-installed water stop 6 and the groove 3 according to the size of the concrete structure. Perform non-destructive cutting on the old concrete 2 at the position of the pre-installed water stop 6 to form a groove 3 with a width of 25 cm and a depth of 20 cm. After the cutting is completed, roughen the surface of the groove 3, and after chiseling out the exposed steel bars, apply a layer of asphalt on the ends of the steel bars for corrosion protection.

[0042] Several rebar holes 9 are drilled on the side of the groove 3 away from the joint. The diameter of the rebar hole 9 is 2 cm, the length extending to the inside of the old concrete 2 is 25 cm, and the distance between adjacent rebar holes 9 is 20 cm; if the position of the rebar hole 9 is the original designed force-bearing rebar position of the old concrete 2, the hole position of the rebar hole 9 should be appropriately adjusted to avoid it. After drilling the rebar hole 9, use a steel brush to remove the floating dust in the hole wall, and use compressed air to blow out the dust in the hole to keep it clean.

[0043] Fix the rebar 4 in the rebar hole 9. The rebar 4 is made of grade 3 steel with a diameter of 16mm. The part of the rebar 4 implanted in the rebar hole 9 is brushed with a wire to remove the surface rust and oxide layer and set aside. Inject the rebar glue 10 into the rebar hole 9 manually to fill 2 / 3 of the hole depth, and then insert the treated rebar 4 into the rebar hole 9. Since the rebar glue 10 has a certain concentration, it generally cannot be inserted to the bottom at one time. Repeated pulling, inserting or rotating methods are used until one end of the rebar 4 is inserted into the bottom of the rebar hole 9, while preventing the rebar 4 from rebounding. Then fill the rebar hole 9 with the rebar glue 10 again until the rebar hole 9 is closed. After the joint reaches the design strength, subsequent construction can be carried out.

[0044] The water stop 9 is fixed in the old concrete 2. After the joint of the anchor bar 4 meets the construction requirements, the dust in the groove 3 is washed with high-pressure water; the side of the water stop 9 is placed in the groove and above the anchor bar 4, with a distance of more than 1 cm, and the template is used for auxiliary installation, and the water stop 9 shall not be perforated; after the fixing is completed, the fine stone concrete 5 mixed with 8% expansion agent is filled in the groove 3, and it shall not be exposed to open water within 24 hours. If it has not hardened yet, it cannot be sprayed for curing. The water stop should meet the relevant requirements of the "Technical Specifications for Water Stops of Hydraulic Structures" (DL / T 5215-2005), and the rubber water stop should also meet the relevant requirements of "Polymer Waterproof Materials Part 2: Water Stop" (GB 18173.2-2014).

[0045] The water stop 9 is fixed in the new concrete 1. First, the foam board 7 is placed above and below the water stop 6 and close to the side of the old concrete 2, and then the extra water stop 9 is cast to fix the water stop 9 in the new concrete 1.

[0046] Seal the joint. When the strength of the new concrete 1 reaches more than 70% of the design strength, grind the two glue-coated side walls of the joint facing the water with a grinder, clean them properly, and clean up the dust, oil, loose concrete residues and other debris in the joint. At the same time, ensure that the glue-coated base surface remains dry. The joint facing the water is sealed by injecting sealant 8 with a gun. The size of the sealant 8 in the width direction of the joint on the water-facing surface is 2-4cm, and the size in the depth direction of the joint is 2-4cm. The irregular parts can be applied with a batch. To ensure the sealing effect, it is strictly forbidden to mix bubbles in the sealant 8.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A new-old concrete connection structure, comprising new concrete (1) and old concrete (2), with a connection seam between the two; characterized in that: It also includes a groove (3), a reinforcing bar (4), a water stop (6) and a reinforcing bar hole (9); The old concrete (2) is provided with a groove (3) at the position where the water stop strip (6) is pre-placed, and a plurality of rebar holes (9) are provided on the side of the groove (3) away from the joint, and all the rebar holes (9) are evenly arranged along the length direction of the joint; one end of the rebar (4) is arranged in the rebar hole (9) and is filled and fixed by rebar glue (10), and the other end of the rebar (4) extends into the groove (3); The water stop strip (6) is arranged along the connection seam, one side of the water stop strip (6) is fixed in the new concrete (1), and the other side is placed in the groove (3), and the water stop strip (6) is fixed in the old concrete (2) by filling the groove (3) with fine stone concrete (5); the part of the water stop strip (6) in the groove (3) is located above the embedded reinforcement (4), and the water stop strip (6) does not contact the embedded reinforcement (4); The connection seam between the new concrete (1) and the old concrete (2) is filled with a foam board (7), and the water-facing end of the connection seam is sealed by a sealant (8).

2. The new-old concrete connection structure according to claim 1, characterized in that: The dimension of the groove (3) in the depth direction of the connection seam is 20 cm, and the dimension in the width direction of the connection seam is 25 cm.

3. The new-old concrete connection structure according to claim 1, characterized in that: The diameter of the reinforcing bar embedding hole (9) is 2 cm, the dimension in the width direction of the connecting seam is 25 cm, and the distance between adjacent reinforcing bar embedding holes (9) is 20 cm.

4. The new-old concrete connection structure according to claim 1, characterized in that: The distance between the water stop strip (6) in the groove (3) and the embedded reinforcement (4) is greater than 1 cm.

5. The new-old concrete connection structure according to claim 1, characterized in that: The fine stone concrete (5) is C40 water-based epoxy resin fine stone concrete and is mixed with 8% of expansion agent.

6. The new-old concrete connection structure according to claim 1, characterized in that: The thickness of the foam board (7) is consistent with the width of the connecting seam.

7. The new-old concrete connection structure according to claim 6, characterized in that: The foam board (7) is a polyethylene foam board, and the thickness of the foam board (7) is 2 cm.

8. The new-old concrete connection structure according to claim 1, characterized in that: The sealant (8) is a polysulfide sealant, and the size of the sealant (8) in the width direction of the connection seam on the water-facing surface is 2-4 cm, and the size in the depth direction of the connection seam is 2-4 cm.

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