Post-pouring construction method for slope foundation post-pouring belt
By using concrete slabs and pouring pipes to alternately pour and multiple vibrations in the construction of slope-type foundation post-pouring tape, the problems of poor compactness and high construction difficulty in traditional methods are solved, and uniform pouring and high density of post-pouring tapes are achieved. , and simplify the construction process and reduce costs.
Patent Information
- Application Number
- CN202411435215.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-15
- Publication Date
- 2024-12-31
AI Technical Summary
The construction method of traditional slope-type foundation post-pouring tape leads to poor compactness when vibrating, and the construction of earth backfilling is difficult and costly. The existing technology has set up positioning inner ring sleeves and steel risers at the shear walls to cause uneven vibration. .
Multiple concrete slabs and pouring pipes are used for support, alternately cast with shear walls and sloped parts, and multiple vibratings are used for vibration, combined with waterproof mortar and polyurethane waterproof coating for reinforcement, and the projection area according to the sloped plane Calculate the number of poured pipes to ensure that the concrete is poured evenly.
The uniform pouring and high density of concrete in the post-casting strip is achieved, the construction process is simplified, the project volume and construction difficulty is reduced, the construction cycle is shortened, and the strength and stability of the concrete slabs are improved.
Smart Images
Figure CN119221526A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of post-casting strip pouring, and in particular to a post-casting construction method for a slope foundation post-casting strip. Background Art
[0002] Post-cast strips are concrete strips that are usually left at the corresponding positions of the foundation slab, wall, and beam to prevent harmful cracks that may occur in reinforced concrete structures due to uneven shrinkage or settlement during construction. Post-cast strips temporarily divide the structure into several parts. After the internal shrinkage of the components, the construction joint concrete is poured again after a period of time to form a whole zone. The strength grade of the poured concrete in the post-cast strips should be one level higher than the strength of the components to prevent cracks between the new and old concrete and avoid the formation of weak points.
[0003] According to traditional construction technology, the foundation settlement post-casting joint can only be poured after the construction age. If the construction period needs to be shortened and the foundation needs to be backfilled in advance, a retaining wall or a concrete retaining wall must be built on the post-casting joint. If a concrete retaining wall is used to seal the post-casting joint, for the post-casting joint of the slope foundation, the construction difficulty of backfilling will be greatly increased, and the construction cost will also be increased.
[0004] Chinese patent CN115961647A discloses a pre-enclosed structure, construction structure and construction method for a post-cast strip of a basement roof, and the construction method comprises the following steps: S1, setting up the post-cast strip independent support, so that the post-cast strip independent support is used to support and close the bottom of the post-cast strip pouring space of the roof, and the post-cast strip independent support is disconnected from the supporting structure of the basement roof; S2, laying a plurality of concrete slabs on the basement roof on both sides of the reserved post-cast strip pouring space of the roof, and fixing each of the concrete slabs to the basement roof, and the plurality of concrete slabs are arranged side by side and adjacent to each other and bonded and fixed; S3, carrying out the waterproof layer construction, laying waterproof membrane on the upper part of each concrete slab; S4, setting a steel riser on the outer side of the positioning inner ring; S5, carrying out backfill soil layer construction on the upper part of the waterproof layer; S6, after the construction of the surrounding main building structure is completed, pouring concrete directly into the post-cast strip of the roof through the steel riser.
[0005] Although the construction method of the above patent avoids the disadvantages of increased difficulty and cost of backfill construction caused by using concrete retaining walls to block the post-cast strips, it only sets positioning inner ring sleeves and steel risers at the shear walls. During vibration, the vibration in the space corresponding to the sloped part is not uniform, resulting in poor compactness in the sloped post-cast strips.
[0006] Therefore, there is an urgent need to provide a post-casting construction method for a slope foundation post-casting belt. Compared with the existing technology, the slope post-casting belt is evenly vibrated to ensure the compactness of the slope post-casting belt. Summary of the invention
[0007] The invention solves the technical problems existing in the prior art and provides a post-casting construction method for a post-casting strip of a slope foundation.
[0008] To achieve the above purpose, the technical solution adopted by the present invention is as follows:
[0009] A post-casting construction method for a slope foundation post-casting belt comprises the following steps:
[0010] S1. Prepare multiple concrete slabs and multiple pouring pipes;
[0011] S2, clean the back pouring zone position;
[0012] S3, installing the concrete slab prepared in step S1 at the position of the post-casting zone;
[0013] S4, installing the pouring pipes prepared in step S1 on the concrete slab at the top of the shear wall of the post-casting belt and on each sloped part of the post-casting belt, and all the installed pouring pipes are connected to the inside of the post-casting belt;
[0014] S5. Carry out overall reinforcement;
[0015] S6, backfilling;
[0016] S7, pouring concrete into the post-casting strip through the multiple pouring pipes installed in step S4;
[0017] S8. Maintain the post-casting joint after pouring.
[0018] Furthermore, S7 specifically includes the following steps:
[0019] S71, performing the first pouring. During the first pouring, first use a vibrating rod to vibrate and pour in the pouring pipe at the top of the shear wall for a first set number of times; then use a vibrating rod to vibrate and pour in the pouring pipe at each sloped part for a second set number of times;
[0020] S72, performing a second pouring, during which a vibrating rod is first used to vibrate and pour in the pouring pipe at each sloped portion at the same time, vibrating for a third set number of times; then a vibrating rod is used to vibrate and pour in the pouring pipe at the top of the shear wall, vibrating for a fourth set number of times;
[0021] S73, loop steps S71-S72 until the concrete in all the pouring pipes is higher than the top of the corresponding post-casting strip, and then stop the loop.
[0022] Furthermore, S3 specifically includes the following steps:
[0023] S31, laying the concrete slab at the corresponding post-casting strip position according to the set position, and laying the concrete slab using waterproof mortar;
[0024] S32, the outermost concrete slab is set wider than the post-casting strip, and the concrete slab wider than the post-casting strip is overlapped on the cast-in-place concrete structure using waterproof mortar;
[0025] S33. For the concrete slabs arranged on the side walls of the shear walls, a plurality of sets of tension screws are arranged between the opposite concrete slabs, and the tension screws are fixed to the concrete slabs through fastener-type steel pipes.
[0026] Furthermore, the specific method for overall reinforcement in step S5 is: laying waterproof mortar again between the concrete slab and the cast-in-place concrete structure, between two adjacent concrete slabs, at the perforations of the tension screws, and at the perforations of the casting pipes, and after laying the waterproof mortar, apply the polyurethane waterproof coating.
[0027] Further, in step S4, the number of casting pipes arranged at the sloped portion is set according to the plane projection area of the sloped portion, which is specifically calculated by the following formula:
[0028]
[0029] n≥3;
[0030] In the above formula, n represents the number of casting pipes in the sloped part, and S represents the plane projection area of the sloped part.
[0031] Furthermore, a reserved hole is provided on the concrete slab where the casting pipe is to be installed. In step S4, cement slurry is first applied to the inner wall of each reserved hole, and then the casting pipe is inserted into the reserved hole, and then cement mortar is used to fill the junction between the casting pipe and the reserved hole.
[0032] Furthermore, the length of the pouring pipe extending out of the post-casting zone is greater than the height of the earth backfill.
[0033] Furthermore, a plurality of steel meshes are provided inside the concrete slab prepared in step S1, and the concrete slab is cast using C20 concrete, and hanging rings are cast on the concrete slab.
[0034] Compared with the prior art, the present invention has the following beneficial effects:
[0035] (1) When pouring the post-casting strip, the present invention adopts the method of alternately pouring the shear wall and the sloped part, thereby ensuring that the concrete inside the sloped part is poured evenly and has high compactness.
[0036] (2) The present invention is simple and convenient to manufacture. Concrete slabs are first used to support the post-cast strip, thus avoiding the large amount of work and high construction difficulty of traditional retaining walls.
[0037] (3) The present invention uses concrete slabs to support the post-cast joints. Compared with traditional wooden formworks, the concrete slabs will not mold, damage, or deform even in a humid soil environment. They have higher strength and are more stable to install.
[0038] (4) After the concrete slab is installed on the post-casting strip, the earth backfilling can be carried out directly without waiting for the retention period of the post-casting strip, which greatly shortens the construction period. BRIEF DESCRIPTION OF THE DRAWINGS
[0039] Figure 1 is a flow chart of the method of the present invention.
[0040] Figure 2 It is a schematic diagram of the post-cast strip of the present invention after the concrete slab is installed.
[0041] Description of reference numerals:
[0042] 1. Concrete slab; 2. Tension screws; 3. Fastener-type steel pipe; 4. Casting pipe; 5. Cast-in-place concrete structure. DETAILED DESCRIPTION
[0043] The technical solution of the present invention will be clearly described below in conjunction with the accompanying drawings. Obviously, the described embodiments are not all embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention. It should be noted that the orientation or position relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", etc. is based on the orientation or position relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0044] like Figure 1 , Figure 2 As shown, the present invention provides a method for post-casting a slope foundation post-casting belt, comprising the following steps:
[0045] S1. Prepare multiple concrete slabs 1 and multiple casting tubes 4, determine the number of concrete slabs 1 to be prepared according to the size of the post-cast strip, and ensure that each side of all concrete slabs 1 is at least 150 mm wider than the post-cast strip after installation; when preparing the concrete slabs 1, at least one concrete slab 1 with a reserved hole is set among the multiple concrete slabs 1 installed at the sloped part of each post-cast strip, and one concrete slab 1 with a reserved hole is set among the concrete slabs 1 installed on the top of the shear wall, and the number of casting slabs is set to be the same as the number of concrete slabs 1 with reserved holes.
[0046] The casting pipe 4 is made of UPVC material.
[0047] The number of pouring pipes is set according to the plane projection area of the slope part, which is calculated by the following formula:
[0048]
[0049] n≥3;
[0050] In the above formula, n represents the number of casting pipes in the sloped part, and S represents the plane projection area of the sloped part.
[0051] When preparing the concrete slabs 1, multiple steel meshes are arranged inside each concrete slab 1. The size of each steel mesh is preferably 10×150 mm. The thickness of each concrete slab 1 is set to 100 mm. C20 concrete is used for casting. At the same time, each concrete slab 1 is cast with a lifting ring to facilitate later installation and transportation.
[0052] S2. Clean the post-cast strip and polish the cast-in-place concrete structure 5 around the post-cast strip. Specifically, remove the floating slurry and loose concrete on the concrete surfaces of the foundation, foundation beam and shear wall on both sides of the post-cast strip with an electric hammer, rinse with pressurized water, and then apply concrete interface agent.
[0053] S3, the concrete slab 1 prepared in step S1 is installed at the position of the post-casting strip processed in step S2, and the cross-section of all concrete slabs 1 after installation is as follows: Figure 2 As shown, the specific method is:
[0054] S31. Lay the concrete slab 1 at the corresponding post-casting joints according to different positions, and use waterproof mortar to lay the concrete slab 1 at the post-casting joints to ensure that a concrete slab 1 with a reserved hole is set on the top of the shear wall, and at least one concrete slab 1 with a reserved hole is set on each sloped part.
[0055] S32, the outermost concrete slab 1 is overlapped with the part of the post-casting strip that is adjacent to the cast-in-place concrete structure 5, and the concrete slab 1 is paved on the cast-in-place concrete structure 5 using waterproof mortar.
[0056] S33. For the concrete slabs 1 arranged on the side walls of the shear walls, multiple groups of tension screws 2 and fastener-type steel pipes 3 are arranged between the concrete slabs 1 on the opposite side walls. Each tension screw 2 connects the corresponding two concrete slabs 1 on the opposite side walls together, and both ends of each tension screw 2 are fixed by fastener-type steel pipes 3.
[0057] S4. Install the casting pipe 4 prepared in step S1 into the reserved hole of each concrete slab 1 with the reserved hole. It is necessary to first apply cement slurry on the inner wall of each reserved hole, and then insert the casting pipe 4 into the reserved hole. The casting pipe 4 and the concrete slab 1 are bonded with cement slurry. At the same time, waterproof mortar is used to seal the junction between the casting pipe 4 and the reserved hole; ensure that the length of the casting pipe 4 extending out of the post-casting strip is greater than the height of the backfill.
[0058] S5, carry out overall reinforcement, and again lay waterproof mortar between the concrete slab 1 and the cast-in-place concrete structure 5, between two adjacent concrete slabs 1, at the perforations of the tension screw 2, and at the perforations of the casting pipe 4. After laying the waterproof mortar, apply polyurethane waterproof coating to prevent ground rainwater and rock gap seepage from invading the post-casting zone. After the overall reinforcement of this step, it can prevent the concrete slab 1 and the cast-in-place concrete structure 5 from being squeezed and collided during the backfilling process due to insufficient adhesion, or the backfill material filled in the joints of the concrete slab 1 due to too high water content in the backfilling process can be prevented from invading the post-casting zone.
[0059] S6. Backfill the earth and select qualified backfill materials for layered rolling and compaction. During the backfilling process, it is necessary to pay attention that the construction machinery cannot collide with or damage the installed prefabricated panels. If a collision occurs, it is necessary to repeat step S5. During the backfilling process, in order to prevent the backfill materials from being transferred into the post-casting zone, the upper end of the pouring pipe 4 needs to be sealed with transparent tape, or the upper end of the pouring pipe 4 needs to be sealed with a wooden board and a waterproof cloth.
[0060] S7, when the pouring conditions of the post-casting zone are met, the post-casting zone is poured with micro-expansion fine stone concrete having a strength grade higher than that of the concrete poured by the cast-in-place concrete structure 5, which specifically includes the following steps:
[0061] S71. Perform the first pouring. During the first pouring process, first use a vibrating rod to vibrate and pour in the pouring tube 4 at the top of the shear wall for a first set number of times; then use a vibrating rod to vibrate and pour in the pouring tube 4 at each sloped part at the same time for a second set number of times.
[0062] S72, perform a second pouring. During the second pouring process, first use a vibrating rod to vibrate and pour in the pouring tube 4 at each sloped part at the same time, and vibrate for a third set number of times; then use a vibrating rod to vibrate and pour in the pouring tube 4 at the top of the shear wall, and vibrate for a fourth set number of times.
[0063] S73, loop steps S71-S72 until the concrete in all the pouring pipes 4 is higher than the top of the corresponding post-casting strip, and then stop the loop.
[0064] S8, the post-casting belt is irrigated for curing, and the portion of the casting pipe 4 extending out of the top of the earth backfill is removed.
[0065] When pouring the post-cast strip, the present invention adopts alternate pouring of the shear wall and the sloped part to ensure that the concrete inside the sloped part is evenly poured with high density; the production is simple and convenient, and the concrete slab 1 is first used to support the post-cast strip, thereby avoiding the large amount of engineering and high construction difficulty of the traditional retaining wall; the concrete slab 1 is used to support the post-cast strip, and compared with the traditional wooden formwork, the concrete slab 1 will not mold, damage or deform even in a humid soil environment, and has higher strength and more stable installation; after the concrete slab 1 is installed on the post-cast strip, the earth backfilling can be carried out directly without waiting for the retention period of the post-cast strip, which greatly shortens the construction period.
[0066] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.
Claims
1. A method for post-casting a slope foundation post-casting belt, characterized in that: The following steps are involved: S1. Prepare multiple concrete slabs and multiple pouring pipes; S2, clean the back pouring zone position; S3, installing the concrete slab prepared in step S1 at the position of the post-casting zone; S4, installing the pouring pipes prepared in step S1 on the concrete slab at the top of the shear wall of the post-casting belt and on each sloped part of the post-casting belt, and all the installed pouring pipes are connected to the inside of the post-casting belt; S5. Carry out overall reinforcement; S6, backfilling; S7, pouring concrete into the post-casting strip through the multiple pouring pipes installed in step S4; S8. Maintain the post-casting joint after pouring.
2. A method for post-casting a slope foundation post-cast strip according to claim 1, characterized in that: S7 specifically includes the following steps: S71, performing the first pouring. During the first pouring, first use a vibrating rod to vibrate and pour in the pouring pipe at the top of the shear wall for a first set number of times; then use a vibrating rod to vibrate and pour in the pouring pipe at each sloped part for a second set number of times; S72, performing a second pouring, during which a vibrating rod is first used to vibrate and pour in the pouring pipe at each sloped portion at the same time, vibrating for a third set number of times; then a vibrating rod is used to vibrate and pour in the pouring pipe at the top of the shear wall, vibrating for a fourth set number of times; S73, loop steps S71-S72 until the concrete in all the pouring pipes is higher than the top of the corresponding post-casting strip, and then stop the loop.
3. A method for post-casting a slope foundation post-cast strip according to claim 1, characterized in that: S3 specifically includes the following steps: S31, laying the concrete slab at the corresponding post-casting strip position according to the set position, and laying the concrete slab using waterproof mortar; S32, the outermost concrete slab is set wider than the post-casting strip, and the concrete slab wider than the post-casting strip is overlapped on the cast-in-place concrete structure using waterproof mortar; S33. For the concrete slabs arranged on the side walls of the shear walls, a plurality of sets of tension screws are arranged between the opposite concrete slabs, and the tension screws are fixed to the concrete slabs through fastener-type steel pipes.
4. A method for post-casting a slope foundation post-cast strip according to claim 3, characterized in that: The specific method for overall reinforcement in step S5 is: laying waterproof mortar again between the concrete slab and the cast-in-place concrete structure, between two adjacent concrete slabs, at the perforations of the tension screws, and at the perforations of the casting pipes, and after laying the waterproof mortar, apply the polyurethane waterproof coating.
5. The method for post-casting a slope foundation post-cast strip according to claim 1, characterized in that: In step S4, the number of casting pipes set at the sloped part is set according to the plane projection area of the sloped part, which is specifically calculated by the following formula: n≥3； In the above formula, n represents the number of casting pipes in the sloped part, and S represents the plane projection area of the sloped part.
6. A method for post-casting a slope foundation post-cast strip according to claim 5, characterized in that: A reserved hole is provided on the concrete slab where the pouring pipe is to be installed. In step S4, cement slurry is first applied to the inner wall of each reserved hole, and then the pouring pipe is inserted into the reserved hole, and then cement mortar is used to fill the junction between the pouring pipe and the reserved hole.
7. A method for post-casting a slope foundation post-cast strip according to claim 6, characterized in that: The length of the pouring pipe extending out of the post-casting zone is greater than the height of the backfill.
8. The method for post-casting a slope foundation post-cast zone according to claim 1, characterized in that: The concrete slab prepared in step S1 is provided with a plurality of steel meshes inside, and the concrete slab is cast using C20 concrete, and hanging rings are cast on the concrete slab.