Elevated water tank bottom slab induced joint construction method

Abstract

The present invention relates to the technical field of concrete construction, and in particular to an elevated water tank bottom slab induced joint construction method. The method comprises the following steps: S1: laying externally bonded rubber waterstops below a center line position of a selected induced joint; S2: disconnecting bottom slab transverse reinforcements on the left side and the right side of the induced joint, and respectively additionally arranging constructional reinforcements on the left side and the right side of the induced joint; and laying a buried rubber waterstop at the induced joint; and S3: before pouring of a bottom slab of an elevated water tank to form a concrete pouring body, mounting a strip plate-shaped waterstop type inducer at the induced joint, additionally arranging an extruded polystyrene board at the upper end of the waterstop type inducer, when concrete pouring is completed, cleaning up the extruded polystyrene board, and then filling and sealing the induced joint with a polysulfide sealant. According to the present solution, the externally bonded rubber waterstop, the buried waterstop and other waterstop materials are used to perform anti-seepage treatment on a construction joint; and a construction joint is formed by means of the waterstop type inducer, and when the construction joint has been formed, the construction joint is filled with the polysulfide sealant, thereby achieving the compensation effect during expansion and contraction of the induced joint.

Description

A construction method for initiating seams on the bottom plate of an overhead pool Technical Field

[0001] The invention belongs to the technical field of concrete construction, and in particular relates to a method for constructing an initiating seam on an overhead pool bottom plate. Background Art

[0002] As urban construction develops at an increasingly rapid pace, the country has vigorously built public welfare buildings. In the past, water plants occupied a large area. With the development of technology, overhead composite water plants, also known as "air water plants", have also appeared. The existing overhead composite water plants are often constructed in sections. The construction of concrete sections often produces initiation joints, which are also called construction joints. They refer to the joints 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 that the first poured concrete exceeds the initial setting time, and there is a bonding surface between it and the later poured concrete. This bonding surface is called a construction joint.

[0003] If the aerial water plant is constructed by segmented pouring, the construction joints will easily become weak links in the structure due to the reduced tensile, shear and flexural strengths of the interface between the new and old concrete phases, and the differences in shrinkage, elastic deformation and plastic deformation between the new and old concrete phases. This can cause cracks and leakage, and even endanger the safety of the structure. Currently, common problems in the construction of the aerial water plant base plate are:

[0004] 1. The bottom plate of the pool is large. If the concrete shrinks, it is very easy to cause cracks at the initiation seam, which will lead to cracks in the pool body and water seepage.

[0005] 2. Conventional construction joints have poor waterproofing and anti-seepage effects and a long construction period, making them unsuitable for the construction of overhead superimposed water plants.

[0006] Since overhead superimposed water plants have high requirements for water seepage resistance of the pool bottom slab and the pool bottom slab has a large area and there is a risk of concrete shrinkage cracks, it is necessary to design a new initiation joint construction method. Summary of the Invention

[0007] In order to solve the above problems existing in the prior art, this solution provides a construction method for initiating seams on the bottom plate of an overhead pool.

[0008] The technical solution adopted in the present invention is:

[0009] A method for constructing an initiating seam on an overhead pool bottom plate comprises the following steps:

[0010] S1: After selecting the location of the initiation joint, lay the external rubber waterstop below the centerline of the selected initiation joint. During the laying process, ensure that the centerline of the external rubber waterstop coincides with the centerline of the initiation joint. Perform hot-melt welding on adjacent external rubber waterstops.

[0011] S2: Disconnect the transverse reinforcements of the bottom plate on both sides of the initiation joint. When tying the reinforcements, add structural reinforcements on both sides of the initiation joint. Lay a buried rubber waterstop at the initiation joint. Lay the buried rubber waterstop in a V-shape on the structural reinforcement. Place the buried rubber waterstop above the external rubber waterstop.

[0012] S3: Before pouring the bottom plate of the overhead water pool to form a concrete casting body, install a strip-shaped water-stopping inducer at the initiation joint, and add an extruded board on the upper end of the water inducer, and the extruded board is perpendicular to the water-stopping inducer; pour the concrete, clean the extruded board after the concrete pouring, and fill the initiation joint with polysulfide sealant.

[0013] As a supplement or alternative to the above-mentioned overhead pool bottom plate initiation joint construction method, an external rubber waterstop is used. External EB350*6-30 rubber waterstop.

[0014] As a supplement or alternative to the above-mentioned construction method of initiating seams in the bottom plate of an overhead pool: before hot-melt welding the external rubber waterstop, grind the 10cm range of the joint of the external rubber waterstop, grind the outer surface of the external rubber waterstop clean, and then use hot-melt welding to butt weld it to improve the welding quality.

[0015] As a supplement or alternative to the above-mentioned construction method of the initiation joint of the overhead pool bottom plate: reinforcing bars are added to the upper and lower parts of the left and right sides of the initiation joint, and the reinforcing bars are flush with the longitudinal steel bars of the bottom plate of the overhead pool bottom plate.

[0016] As a supplement or alternative to the above-mentioned construction method of the initiation joint of the overhead pool bottom plate: reinforcing ribs are respectively set at the upper left, lower left, upper right and lower right parts of the initiation joint, and the reinforcing ribs are two parallel φ25 threaded steel bars.

[0017] As a supplement or alternative to the above-mentioned construction method of the initiation joint of the overhead pool bottom plate: the reinforcement is arranged in a direction parallel to the initiation joint, and the reinforcement and the bottom plate transverse steel bars are firmly tied with wire.

[0018] As a supplement or alternative to the above-mentioned construction method of the initiating seam of the overhead pool bottom plate: the embedded rubber waterstop uses CB350*8-30 rubber waterstop.

[0019] As a supplement or alternative to the above-mentioned method of constructing the initiating joint of the bottom slab of the overhead pool: bottom slab transverse reinforcement and bottom slab longitudinal reinforcement are provided in the upper and lower layers of the concrete casting body; the upper layer's bottom slab transverse reinforcement and the upper layer's bottom slab longitudinal reinforcement are tied together by steel wire; the lower layer's bottom slab transverse reinforcement and the lower layer's bottom slab longitudinal reinforcement are tied together by steel wire; vertical reinforcement is connected between the upper layer's bottom slab transverse reinforcement and the lower layer's bottom slab transverse reinforcement; vertical reinforcement is also connected between the upper layer's bottom slab longitudinal reinforcement and the lower layer's bottom slab longitudinal reinforcement.

[0020] As a supplement or alternative to the above-mentioned construction method of initiating seams in the overhead pool bottom plate: the water-stop inducer adopts a structure in which a 0.5mm stainless steel sheet is wrapped with a butyl rubber putty sheet. The upper and lower sides of the water-stop inducer are straightened with a hand winch, and then fixed with iron wire to the horizontal steel bars of the upper and lower bottom plates or to the longitudinal steel bars of the upper and lower bottom plates.

[0021] As a supplement or alternative to the above-mentioned method of initiating seam construction of the overhead pool bottom plate: the structural reinforcement includes upper structural reinforcement and lower structural reinforcement; the upper structural reinforcement is bent into a triangle, and the lower structural reinforcement is bent into a U shape; the upper structural reinforcement is arranged above the lower structural reinforcement at intervals, and forms a space between the two for the side of the embedded rubber water stop to extend into.

[0022] The beneficial effects of the present invention are as follows: according to the actual situation on site, this scheme uses external rubber waterstop, embedded waterstop and other waterstop materials to carry out anti-seepage treatment on the selected construction joint position, and at the same time, through the waterstop inducer, a construction joint is formed automatically along the waterstop inducer after the concrete pouring is completed. After the construction joint is formed, polysulfide sealing paste is filled on the construction joint to play a compensatory role when the seam expands and contracts. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of this solution or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art.

[0024] FIG1 is a process flow chart of the overhead pool bottom plate initiation seam construction method in this scheme;

[0025] Figure 2 is a cross-sectional structural diagram of the initiation seam of the overhead pool bottom plate in this scheme.

[0026] In the figure: 1- transverse reinforcement of the bottom plate; 2- cast concrete body; 4- longitudinal reinforcement of the bottom plate; 5- vertical reinforcement; 6- extruded board; 7- polysulfide sealing paste; 8- water-stopping inducer; 9- external rubber waterstop; 10- upper structural reinforcement; 11- lower structural reinforcement; 12- induced joint; 13- embedded rubber waterstop; 14- reinforcing ribs; 16- formwork. Modes for Carrying Out the Invention

[0027] The technical solution in this embodiment will be clearly and completely described below in conjunction with the accompanying drawings. The described embodiments are only a part of the embodiments, not all of them. Based on the embodiments in this solution, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this solution.

[0028] Example 1

[0029] As shown in Figures 1 and 2, this embodiment designs a method for constructing an overhead pool floor initiation seam, including the following steps:

[0030] S1: Lay the template 16 at the location where the overhead pool bottom plate needs to be cast, and measure and lay out to determine the segmented area for casting and the location of the initiation seam; after the location of the initiation seam is selected, lay the external rubber waterstop 9 below the center line of the selected initiation seam. During the laying process, ensure that the center line of the external rubber waterstop 9 coincides with the center line of the initiation seam, and perform hot-melt welding on adjacent external rubber waterstops 9; the external rubber waterstop 9 can be an external EB350*6-30 rubber waterstop. Before hot-melt welding the external rubber waterstop 9, grind the 10cm range of the joint of the external rubber waterstop 9, grind the outer surface of the external rubber waterstop 9 clean, and then butt-weld it with hot-melt welding to improve the welding quality.

[0031] S2: Disconnect the bottom plate transverse reinforcement 1 on both sides of the trigger joint. When tying the reinforcement, add structural reinforcement on both sides of the trigger joint. Lay a buried rubber waterstop 13 at the trigger joint. The buried rubber waterstop 13 uses CB350*8-30 rubber waterstop. Lay the buried rubber waterstop 13 in a V shape on the structural reinforcement. The buried rubber waterstop 13 is placed above the external rubber waterstop 9. The structural reinforcement includes an upper structural rib 10 and a lower structural rib 11. The upper structural rib 10 is bent into a triangle, and the lower structural rib 11 is bent into a U shape. The upper structural rib 10 is spaced above the lower structural rib 11, and a space is formed between the two for the side of the buried rubber waterstop 13 to extend into.

[0032] S3: Before pouring the concrete casting body 2 of the overhead pool bottom plate, install a strip-shaped water-stopping inducer 8 at the initiation joint, and add an extruded plate 6 at the upper end of the water inducer, the extruded plate 6 being perpendicular to the water-stopping inducer 8; then pour the concrete, clean the extruded plate 6 after pouring the concrete, and seal the initiation joint with polysulfide sealing paste 7, so that the initiation joint can play a multi-purpose role. The water-stopping inducer 8 adopts a structure of 0.5mm stainless steel sheet wrapped with butyl rubber putty sheet. The upper and lower sides of the water-stopping inducer 8 are straightened by hand winches and fixed with wire to the upper and lower bottom plate transverse steel bars 1 or the upper and lower bottom plate longitudinal steel bars 4 respectively.

[0033] Reinforcement ribs 14 are installed at the upper and lower portions of both sides of the initiation joint, flush with the longitudinal reinforcement bars 4 of the elevated pool floor. Reinforcement ribs 14 are installed at the upper left, lower left, upper right, and lower right of the initiation joint. These ribs 14 consist of two parallel φ25 threaded steel bars. These ribs 14 are arranged parallel to the initiation joint and are securely fastened to the transverse reinforcement bars 1 of the floor with wire ties. Since the concrete on either side of the initiation joint is not integral, reinforcement ribs 14 are installed on both sides of the initiation joint to ensure that the structural stresses at the initiation joint are not affected.

[0034] Bottom plate transverse reinforcement 1 and bottom plate longitudinal reinforcement 4 are provided in the upper and lower layers of the concrete casting body 2; the upper bottom plate transverse reinforcement 1 and the upper bottom plate longitudinal reinforcement 4 are tied together by steel wire; the lower bottom plate transverse reinforcement 1 and the lower bottom plate longitudinal reinforcement 4 are tied together by steel wire; vertical reinforcement 5 is connected between the upper bottom plate transverse reinforcement 1 and the lower bottom plate transverse reinforcement 1; vertical reinforcement 5 is also connected between the upper bottom plate longitudinal reinforcement 4 and the lower bottom plate longitudinal reinforcement 4.

[0035] The overhead pool floor initiation joint construction method proposed in this solution has the advantage of shortening the construction period. Compared to traditional construction joints, both sides of the initiation joint can be constructed simultaneously. This also reduces the risk of cracking and water seepage in the pool later. While pouring large areas of concrete at once carries a high risk of concrete cracking, initiation joint construction can control the cracking location and provide a waterproofing effect. This reduces construction costs and minimizes the expense of subsequent water seepage control.

[0036] Since the anti-seepage requirements of the pool bottom plate of the overhead superimposed water plant are high and the pool bottom plate area is large, there is a risk of concrete shrinkage cracks. According to the actual situation on site, a construction joint is set in the middle of a short distance, and the construction joint is treated with anti-seepage treatment using water-stop materials such as external rubber waterstop 9 and embedded rubber waterstop 13. At the same time, after the concrete pouring is completed, a construction joint is formed automatically along the water-stop inducer 8 through the water-stop inducer 8. After the construction joint is formed, polysulfide sealing paste 7 is filled on the construction joint to play a compensatory role when the seam expands and contracts.

[0037] The method for constructing seams on the bottom plate of an overhead water pool in this embodiment was used in the context of the construction of three major pools in the third standard of the "Wangjia Dajing" water source emergency replacement project in Guiyang City. The impact of the clear water pool construction on the construction period was evaluated, and the method in this embodiment was selected. The construction progress was carried out smoothly, the construction was successfully applied, the project safety and quality met the requirements, and the project progress was guaranteed.

[0038] According to calculation, the method in this embodiment: (1) improves the construction progress: the initiation joint construction can divide the structure into areas for construction, so that the complex structure can be constructed in the front. The total construction period of the three superimposed pools is 244 days, and 200 days after the initiation joint construction is adopted; the total progress is improved by 44 days; (2) the construction cost is reduced. Based on the calculation of saving 44 days of construction period, the project department management indirect cost is calculated at a comprehensive per capita 150 / day / person, and the cumulative savings are 32x150x44=211,000 yuan. If the construction or post-construction is adopted, the team can roughen the construction joints, which can save 300x44=13,000 yuan; a total of 224,000 yuan can be saved.

[0039] Furthermore, the preparatory work for the overhead pool floor induced seam construction method described in this embodiment for the "Wangjia Dajing" emergency water source replacement project in Guiyang included establishing a quality leadership team and assigning quality inspectors to the construction site. A practical technical briefing document was developed, and all staff were trained. Construction inspection and acceptance required a three-step system, and work on the next process was strictly prohibited until the previous process had passed inspection and acceptance.

[0040] (1) For special parts during construction, engineering and technical personnel shall prepare special construction plans and technical instructions in advance, and reasonably arrange the construction sequence and personnel allocation to avoid unreasonable process connection, which may affect the construction progress and cause quality problems.

[0041] (2) Strengthen the process control of project quality. If it is found that the construction procedures are violated, the construction is not carried out according to the design drawings, specifications and technical instructions, and the materials, semi-finished products and equipment used do not meet the quality requirements during the construction process, the construction shall be ordered to stop in time. If necessary, a rectification notice shall be issued. If the rectification is completed within a time limit, a fine shall be issued if the circumstances are serious. Semi-finished products or unqualified finished products shall be eliminated.

[0042] (3) Quality acceptance of construction materials and finished products. Ensuring the quality of construction materials is the premise for ensuring the quality of engineering products and is also the key to ensuring the quality of the entire project. Therefore, all types of materials entering the site must be strictly checked by the material purchaser and must be jointly accepted by the construction personnel, quality inspectors, and material inspectors. At the same time, random samples are sent to the testing company to test the material performance. Unaccepted or unqualified materials, finished products, and semi-finished products are not allowed to enter the site or be used.

[0043] (4) Adhere to the system of quality control at every level. After each construction process is completed, the team will conduct self-inspection. If it is found to meet the requirements, it will be re-inspected by the project management department. If it passes, the monitoring engineer will be notified for inspection. Only after the supervision engineer agrees and signs, can the next process be carried out. If the team changes the construction process without quality inspection, it will be dealt with seriously according to relevant regulations.

[0044] (5) Strictly implement the project supervision system. All concealed projects must fill in the concealed project inspection record and be signed by the supervision engineer before they can be concealed.

[0045] The above embodiments are merely examples for the purpose of illustrating the present invention clearly and are not intended to limit the embodiments. It is not necessary and impossible to enumerate all embodiments here. Obvious changes or modifications derived therefrom are still within the scope of protection of this technology.

Claims

1. A method for constructing an initiating seam of an overhead pool bottom plate, characterized in that: The following steps are involved: S1: After selecting the position of the initiation seam, laying an external rubber water stop (9) below the selected center line position of the initiation seam, ensuring that the center line of the external rubber water stop (9) coincides with the center line of the initiation seam during the laying process, and performing hot-melt welding on adjacent external rubber water stop (9); S2: disconnecting the bottom plate transverse steel bars (1) on the left and right sides of the initiation joint, and adding structural steel bars on the left and right sides of the initiation joint when tying the steel bars; laying an embedded rubber waterstop (13) at the initiation joint, laying the embedded rubber waterstop (13) in a V shape on the structural steel bars, and placing the embedded rubber waterstop (13) above the external rubber waterstop (9); S3: Before pouring the bottom plate of the overhead water pool to form a concrete casting body (2), a strip-shaped water-stopping inductor (8) is installed at the initiation joint, and an extruded plate (6) is added at the upper end of the water inductor, and the extruded plate (6) is perpendicular to the water-stopping inductor (8); concrete pouring is carried out, and after the concrete pouring is completed, the extruded plate (6) is cleaned and the initiation joint is sealed with polysulfide sealing paste (7).

2. The method for constructing an overhead pool bottom plate initiation seam according to claim 1, characterized in that: The externally attached rubber water stop (9) adopts an externally attached EB350*6-30 rubber water stop.

3. The method for constructing an overhead pool bottom plate initiation seam according to claim 1, characterized in that: Before hot-melt welding of the external rubber water stop (9), the 10 cm range of the joint of the external rubber water stop (9) is polished, and the outer surface of the external rubber water stop (9) is polished clean before hot-melt welding is performed to improve the welding quality.

4. The method for constructing an overhead pool bottom plate initiation seam according to claim 1, characterized in that: Reinforcement ribs (14) are added to the upper and lower parts of the left and right sides of the initiation joint, and the reinforcement ribs (14) are flush with the bottom plate longitudinal steel bars (4) of the overhead pool bottom plate.

5. The method for constructing an overhead pool bottom plate initiation seam according to claim 4, characterized in that: Reinforcement ribs (14) are respectively arranged at the upper left part, the lower left part, the upper right part and the lower right part of the initiation seam, and the reinforcement ribs (14) are two parallel φ25 threaded steel bars.

6. The method for constructing an overhead pool bottom slab seam initiation according to claim 5, characterized in that: The reinforcing ribs (14) are arranged in a direction parallel to the initiating seam, and the reinforcing ribs (14) and the bottom plate transverse steel bars (1) are firmly tied together with a tie wire.

7. The method for constructing an overhead pool bottom slab seam initiation according to claim 1, characterized in that: The embedded rubber water stop (13) uses CB350*8-30 rubber water stop.

8. The method for constructing an overhead pool bottom slab seam initiation according to claim 1, characterized in that: Bottom plate transverse steel bars (1) and bottom plate longitudinal steel bars (4) are arranged at both the upper and lower layers in the concrete casting body (2); the upper layer bottom plate transverse steel bars (1) and the upper layer bottom plate longitudinal steel bars (4) are bound together by steel wires; the lower layer bottom plate transverse steel bars (1) and the lower layer bottom plate longitudinal steel bars (4) are bound together by steel wires; vertical bars (5) are connected between the upper layer bottom plate transverse steel bars (1) and the lower layer bottom plate transverse steel bars (1); and vertical bars (5) are also connected between the upper layer bottom plate longitudinal steel bars (4) and the lower layer bottom plate longitudinal steel bars (4).

9. The method for constructing an overhead pool bottom slab seam initiation according to claim 8, characterized in that: The water-stopping inductor (8) adopts a structure in which a 0.5 mm stainless steel sheet is wrapped with a butyl rubber putty sheet. The upper and lower sides of the water-stopping inductor (8) are straightened by a hand winch and then fixed to the upper and lower bottom plate transverse steel bars (1) or the upper and lower bottom plate longitudinal steel bars (4) respectively by iron wire.

10. The method for constructing an overhead pool bottom slab seam initiation according to claim 1, characterized in that: The structural reinforcement comprises an upper structural rib (10) and a lower structural rib (11); the upper structural rib (10) is bent into a triangle, and the lower structural rib (11) is bent into a U-shape; the upper structural rib (10) is arranged above the lower structural rib (11) at intervals, and a space is formed between the two for the side of the embedded rubber water stop (13) to extend into.

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