Construction method for treating concrete construction joint through high-pressure water jet

Abstract

The invention provides a construction method for treating a concrete construction joint through high-pressure water jet. The construction method comprises the following steps that (1) formwork erecting is conducted on a construction joint interface; (2) brushing a retarder on the template at the corresponding position of the interface; (3) after the formwork is removed, the construction joints are cleaned up; (4) washing off an unsolidified slurry layer on the surface by using a high-pressure water gun to expose the coarse aggregate; (5) ensuring that the surface is clean and free of accumulated water; (6) before concrete is poured, a layer of cement mortar with the same components as the concrete is laid at the construction joint; and (7) the newly-poured concrete is finely tamped, and it is ensured that the new concrete and the old concrete are tightly combined. The non-solidified slurry layer on the surface is washed away through the high-pressure water gun, coarse aggregate is exposed, chiseling and cleaning during traditional construction joint treatment are completed at a time, the construction progress can be greatly accelerated, and the construction cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of large building construction, in particular to a construction method for treating concrete construction joints by high-pressure water jetting. Background Art

[0002] The construction joint of concrete refers to the joint formed between the first and last poured concrete during the concrete pouring process due to design requirements or construction needs. The construction joint is not a real "joint". It is just a bonding surface between the first poured concrete and the later poured concrete because the initial setting time exceeds the initial setting time. This bonding surface is called the concrete construction joint.

[0003] A Chinese patent discloses a new type of high-pressure water jet device and underwater high-pressure water jet concrete cleaning system (application number: 201610103843.3) including a main structure, an axial displacement mechanism, a hydraulic clamping mechanism, a concentric positioning mechanism, a circumferential rotation mechanism and a nozzle mechanism. The high-pressure water jet device realizes the automatic crawling of the high-pressure water jet device along the axial direction of the sea pipe through the mutual cooperation of the main structure, the axial displacement mechanism and the hydraulic clamping mechanism, so that a longer sea pipe can be cleaned; the high-pressure water jet device can adapt to sea pipes of different diameters through the adjustment of the concentric positioning mechanism; the position of the nozzle mechanism is adjusted through the circumferential rotation mechanism, so that the submarine pipeline can be cleaned from different angles. However, its construction method is unreasonable and the use cost is high. Summary of the invention

[0004] The technical problem solved by the present invention is to provide a construction method for treating concrete construction joints with high-pressure water jets to solve the problems raised in the above-mentioned background technology.

[0005] The technical problem solved by the present invention is achieved by adopting the following technical scheme: A construction method for treating a concrete construction joint by a high-pressure water jet The construction method for treating a concrete construction joint by a high-pressure water jet comprises the following steps:

[0006] Step (1). Supporting the formwork at the construction joint interface;

[0007] Step (2). Apply the retarder to the template at the corresponding position of the interface;

[0008] Step (3). After removing the formwork, clean the construction joints;

[0009] Step (4) Use a high-pressure water gun to wash away the unsolidified slurry layer on the surface to expose the coarse aggregate;

[0010] Step (5). Fully wet and rinse the concrete surface to ensure that the surface is clean and free of water;

[0011] Step (6). Before pouring concrete, lay a layer of cement mortar with the same composition as the concrete on the construction joint;

[0012] Step (7). The newly poured concrete is carefully compacted to ensure that the new and old concrete are tightly combined.

[0013] Furthermore, when the step (2) is used for rough surface treatment of construction joints, the retarding depth is 5-15 mm. When used, it can be diluted with water according to the instructions and evenly applied.

[0014] Furthermore, before continuing to pour concrete on the hardened concrete surface in step (3), garbage, cement film, loose sand and gravel on the surface, and weak concrete layer should be removed.

[0015] Furthermore, in the step (3), a 100 mm wide and 100 mm deep conical seam is cut at the construction joint, covered with a waterproof board, and then a 1 m wide waterproof reinforcement board is attached. A circle of 10.5 mm thick and 200 mm wide PE protective board is attached to the waterproof board and bonded to the waterproof board with glue.

[0016] Furthermore, when the surface is washed away with a high-pressure water gun in step (4), the compressive strength of the concrete poured on the periphery as a whole reaches above 1.2 N / mm.

[0017] Furthermore, in the step (4), the steel bars are bent back near the construction joint to ensure that the concrete around the steel bars is not damaged by loosening, and the oil stains, cement mortar and loose rust on the steel bars should also be removed.

[0018] Furthermore, in step (6), the thickness of the cement mortar is 10-15 mm, the cement used is 42.5 ordinary Portland cement, and the water-cement ratio is adjusted according to field tests.

[0019] Furthermore, in step (7), the concrete is C25 concrete, and the slump is controlled at 80 to 100 mm.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention uses a high-pressure water gun to flush away the unsolidified slurry layer on the surface to expose the coarse aggregate, and completes the two parts of roughening and cleaning in traditional construction joint treatment at one time, which can greatly improve the construction progress and reduce the construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the method flow of the present invention. DETAILED DESCRIPTION

[0022] In order to make the technical means for realizing the present invention, the creative features, the objectives and effects to be achieved easy to understand, the present invention is further explained below in conjunction with specific diagrams. In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection, or an integral connection can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0023] Example 1

[0024] like Figure 1 As shown, the construction method of high-pressure water jet treatment of concrete construction joints includes the following steps:

[0025] Step (1). Supporting the formwork at the construction joint interface;

[0026] Step (2). Apply the retarder to the template at the corresponding position of the interface;

[0027] Step (3). After removing the formwork, clean the construction joints;

[0028] Step (4) Use a high-pressure water gun to wash away the unsolidified slurry layer on the surface to expose the coarse aggregate;

[0029] Step (5). Fully wet and rinse the concrete surface to ensure that the surface is clean and free of water;

[0030] Step (6). Before pouring concrete, lay a layer of cement mortar with the same composition as the concrete on the construction joint;

[0031] Step (7). The newly poured concrete is carefully compacted to ensure that the new and old concrete are tightly combined.

[0032] When used for rough surface treatment of construction joints in step (2), the retarding depth is 5-15 mm. When used, it can be diluted with water according to the instructions and evenly applied.

[0033] Example 2

[0034] like Figure 1 As shown, the construction method of high-pressure water jet treatment of concrete construction joints includes the following steps:

[0035] Step (1). Supporting the formwork at the construction joint interface;

[0036] Step (2). Apply the retarder to the template at the corresponding position of the interface;

[0037] Step (3). After removing the formwork, clean the construction joints;

[0038] Step (4) Use a high-pressure water gun to wash away the unsolidified slurry layer on the surface to expose the coarse aggregate;

[0039] Step (5). Fully wet and rinse the concrete surface to ensure that the surface is clean and free of water;

[0040] Step (6). Before pouring concrete, lay a layer of cement mortar with the same composition as the concrete on the construction joint;

[0041] Step (7). The newly poured concrete is carefully compacted to ensure that the new and old concrete are tightly combined.

[0042] Before continuing to pour concrete on the hardened concrete surface in step (3), garbage, cement film, loose sand and gravel on the surface, and weak concrete layer should be removed.

[0043] In the step (3), a 100 mm wide and 100 mm deep conical seam is cut at the construction joint, covered with a waterproof board, and then a 1 m wide waterproof reinforcement board is attached. A circle of 10.5 mm thick and 200 mm wide PE protection board is attached to the waterproof board, and glued to the waterproof board.

[0044] Example 3

[0045] like Figure 1 As shown, the construction method of high-pressure water jet treatment of concrete construction joints includes the following steps:

[0046] Step (1). Supporting the formwork at the construction joint interface;

[0047] Step (2). Apply the retarder to the template at the corresponding position of the interface;

[0048] Step (3). After removing the formwork, clean the construction joints;

[0049] Step (4) Use a high-pressure water gun to wash away the unsolidified slurry layer on the surface to expose the coarse aggregate;

[0050] Step (5). Fully wet and rinse the concrete surface to ensure that the surface is clean and free of water;

[0051] Step (6). Before pouring concrete, lay a layer of cement mortar with the same composition as the concrete on the construction joint;

[0052] Step (7). The newly poured concrete is carefully compacted to ensure that the new and old concrete are tightly combined.

[0053] When the surface is washed away with a high-pressure water gun in step (4), the compressive strength of the concrete poured on the periphery as a whole reaches above 1.2 N / mm.

[0054] In the step (4), the steel bars are bent back near the construction joint to ensure that the concrete around the steel bars is not damaged by loosening, and the oil stains, cement mortar and floating rust on the steel bars should also be removed.

[0055] Example 5

[0056] like Figure 1 As shown, the construction method of high-pressure water jet treatment of concrete construction joints includes the following steps:

[0057] Step (1). Supporting the formwork at the construction joint interface;

[0058] Step (2). Apply the retarder to the template at the corresponding position of the interface;

[0059] Step (3). After removing the formwork, clean the construction joints;

[0060] Step (4) Use a high-pressure water gun to wash away the unsolidified slurry layer on the surface to expose the coarse aggregate;

[0061] Step (5). Fully wet and rinse the concrete surface to ensure that the surface is clean and free of water;

[0062] Step (6). Before pouring concrete, lay a layer of cement mortar with the same composition as the concrete on the construction joint;

[0063] Step (7). The newly poured concrete is carefully compacted to ensure that the new and old concrete are tightly combined.

[0064] In step (6), the thickness of the cement mortar is 10-15 mm, the cement used is 42.5 ordinary Portland cement, and the water-cement ratio is adjusted according to on-site tests.

[0065] Example 6

[0066] like Figure 1 As shown, the construction method of high-pressure water jet treatment of concrete construction joints includes the following steps:

[0067] Step (1). Supporting the formwork at the construction joint interface;

[0068] Step (2). Apply the retarder to the template at the corresponding position of the interface;

[0069] Step (3). After removing the formwork, clean the construction joints;

[0070] Step (4) Use a high-pressure water gun to wash away the unsolidified slurry layer on the surface to expose the coarse aggregate;

[0071] Step (5). Fully wet and rinse the concrete surface to ensure that the surface is clean and free of water;

[0072] Step (6). Before pouring concrete, lay a layer of cement mortar with the same composition as the concrete on the construction joint;

[0073] Step (7). The newly poured concrete is carefully compacted to ensure that the new and old concrete are tightly combined.

[0074] In the step (7), C25 concrete is used as the concrete, and the slump is controlled at 80-100 mm.

[0075] After the construction is completed, the construction joints need to be inspected to ensure that the composite surface is flat, without bulges, cracks, or looseness, and the base surface construction joints are leveled with shotcrete (or mortar). The surface meets the flatness requirements for laying waterproof boards. After the contour inspection and base surface finishing are completed, the base surface is comprehensively inspected in accordance with quality standards. Only when the requirements are met can the next process be entered.

[0076] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the 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 fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A construction method for treating concrete construction joints by high-pressure water jetting, characterized in that: The following steps are involved: Step (1). Supporting the formwork at the construction joint interface; Step (2). Apply the retarder to the template at the corresponding position of the interface; Step (3). After removing the formwork, clean the construction joints; Step (4) Use a high-pressure water gun to wash away the unsolidified slurry layer on the surface to expose the coarse aggregate; Step (5). Fully wet and rinse the concrete surface to ensure that the surface is clean and free of water; Step (6). Before pouring concrete, lay a layer of cement mortar with the same composition as the concrete on the construction joint; Step (7). The newly poured concrete is carefully compacted to ensure that the new and old concrete are tightly combined.

2. The construction method for treating concrete construction joints with high-pressure water jet according to claim 1, characterized in that: When used for rough surface treatment of construction joints in step (2), the retarding depth is 5-15 mm. When used, it can be diluted with water according to the instructions and evenly applied.

3. The construction method for treating concrete construction joints with high-pressure water jet according to claim 1, characterized in that: Before continuing to pour concrete on the hardened concrete surface in step (3), garbage, cement film, loose sand and gravel on the surface, and weak concrete layer should be removed.

4. The construction method for treating concrete construction joints with high-pressure water jet according to claim 1, characterized in that: In the step (3), a 100 mm wide and 100 mm deep conical seam is cut at the construction joint, covered with a waterproof board, and then a 1 m wide waterproof reinforcement board is attached. A circle of 10.5 mm thick and 200 mm wide PE protection board is attached to the waterproof board, and glued to the waterproof board.

5. The construction method for treating concrete construction joints with high-pressure water jet according to claim 1, characterized in that: When the surface is washed away with a high-pressure water gun in step (4), the compressive strength of the concrete poured on the periphery as a whole reaches above 1.2 N / mm.

6. The construction method for treating concrete construction joints with high-pressure water jets according to claim 1, characterized in that: In the step (4), the steel bars are bent back near the construction joint to ensure that the concrete around the steel bars is not damaged by loosening, and the oil stains, cement mortar and floating rust on the steel bars should also be removed.

7. The construction method for treating concrete construction joints with high-pressure water jets according to claim 1, characterized in that: In step (6), the thickness of the cement mortar is 10-15 mm, the cement used is 42.5 ordinary Portland cement, and the water-cement ratio is adjusted according to on-site tests.

8. The construction method for treating concrete construction joints with high-pressure water jets according to claim 1, characterized in that: In the step (7), C25 concrete is used as the concrete, and the slump is controlled at 80-100 mm.

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