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DL/T 5788-2019: (Hydraulic construction concrete construction specification)
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(Hydraulic construction concrete construction specification)
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DL/T 5788-2019
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Basic data | Standard ID | DL/T 5788-2019 (DL/T5788-2019) | | Description (Translated English) | (Hydraulic construction concrete construction specification) | | Sector / Industry | Electricity & Power Industry Standard (Recommended) | | Classification of Chinese Standard | P59 | | Word Count Estimation | 36,336 | | Date of Issue | 2019-06-04 | | Date of Implementation | 2019-10-01 | | Regulation (derived from) | Natural Resources Department Announcement No. 7 of 2019 | | Issuing agency(ies) | National Energy Administration | DL/T 5788-2019: (Hydraulic construction concrete construction specification)---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Construction Specification for Hydraulic Grout Enriched Vibrated Concrete
ICS 27.140
P 59
Record number. 63143-2018
People's Republic of China Electric Power Industry Standard
P DL/T 5788-2019
Hydraulic abnormal concrete construction code
2019-06-04 released
2019-10-01 implementation
Issued by National Energy Administration
Foreword
This specification is based on the "Notice of the National Energy Administration on Issuing the First Batch of Industry Standard System (Revision) Plans in the Energy Field in.2014" (National Energy Science
Technology [2014] No. 298) requirements.
During the compilation of this code, the compilation team conducted extensive investigations and summarized the practical experience of construction technology for abnormal concrete projects in my country in recent years.
On this basis, the opinions of relevant units have been extensively solicited in various ways, and the main issues have been discussed and researched repeatedly.
Finalized.
According to the requirements of the "Provisions for the Compilation of Engineering Construction Standards" (Jianbiao [2008] No. 182), this specification is divided into 6 chapters. The main technical contents include.
Material and mortar mix ratio, abnormal concrete construction, quality inspection.
This specification was proposed by the China Electricity Council.
This specification is under the jurisdiction of the Hydropower Construction Standardization Technical Committee of the Electric Power Industry.
Editor-in-chief of this code. China Water Resources and Hydropower Seventh Engineering Bureau Co., Ltd.
Participating unit of this specification. Datang Guanyinyan Hydropower Development Co., Ltd.
The main drafters of this specification. Xiang Jian, Liu Ying, Li Rongguo, Cao Yongfang, Wang Qiang, Zheng Xiang, Li Wen, Liu Xianjun, Li Xiaoqun, Wu Xu,
Zhao Haiyang, Wei Ping, Li Jianhua, Xia Weixue, Fan Daolin, Lei Wen, Yao Xujun, Zhao Hongwei
Main reviewers of this code. Zong Guofeng, Xu Songlin, Mei Jinyu, Wang Yi, Chu Yuexian, Wu Xinqi, Liu Dongni, Wen Yanfeng, Cheng Zhihua
, Sun Laicheng, Guo Guangwen, Tan Kaiyan, Wang Pengyu, Xi Hao, Wu Gaojian, Yang Chengwen, Tu Huaijian, Shen Yiyuan, He Sun Wen, Zhang Jianhua, Lin Peng
, Zhu Mingxing, Yang Huai, Ju Hao, Yang Dechao
Opinions or suggestions during the implementation of this specification are fed back to the Standardization Center of the China Electricity Council (No. 1 Ertiao, Baiguang Road, Beijing,
100761).
Table of contents
Foreword...I
1 General...1
2 Materials...2
3 Mixture ratio of mortar...3
4 Abnormal concrete construction...4
4.1 General provisions...4
4.2 Construction preparation...4
4.3 Paving...4
4.4 Pulping...4
4.5 Slurry...4
4.6 Adding pulp...4
4.7 Vibration...5
4.8 Construction of joint parts...5
5 Quality Inspection...6
5.1 Testing of raw materials and mortar...6
5.2 On-site quality inspection of abnormal concrete...6
Explanation of terms used in this specification...7
List of Reference Standards...8
Attachment. Article description...9
1 General
1.0.1 In order to standardize the construction of abnormal concrete in hydropower and water conservancy projects and improve the quality of construction, this code is specially formulated.
1.0.2 This code is applicable to hydropower and water conservancy RCC projects.
1.0.3 New technologies, new processes, new materials, new equipment, etc., tested in engineering practice can be applied to abnormal concrete construction.
1.0.4 The construction of abnormal concrete shall not only comply with this code but also comply with the current national and industry standards.
2 Material
2.0.1 The raw materials used in the roller compacted concrete before adding grout shall meet the requirements of DL/T 5112.
2.0.2 The cement, admixtures, admixtures, mixing water and other raw materials used in abnormal concrete mortar should be consistent with the roller compacted concrete in the corresponding part.
2.0.3 The transportation and storage site of abnormal concrete raw materials shall comply with DL/T 5112.
2.0.4 The cement and admixtures used in abnormal concrete mortar should be stored separately according to the type and the date of entry, and the principle of first-come-first-served
It should be ventilated and dry. The storage period of qualified admixtures exceeds six months and should be re-inspected before use. The admixture should be stirred evenly when using it.
Prepare a solution of designed concentration and store it in a container to avoid contamination. The storage and transportation of bagged cement exceeds 3 months, and the storage and transportation of bulk cement exceeds 6 months.
Re-check before use. It is strictly forbidden to use cement and admixtures that exceed the shelf life and agglomerate.
3 Mixing ratio of mortar
3.0.1 The water-binder ratio of the mortar used in abnormal concrete should not be greater than the water-binder ratio of the roller compacted concrete at the corresponding part; the amount of admixtures used should not
It is greater than the mixing amount of the admixture in the corresponding part of the roller compacted concrete; the mortar should not be mixed with air-entraining agent, and the mixing amount of other admixtures used should be in accordance with the corresponding
The content of admixtures in the roller compacted concrete is the same in all parts.
3.0.2 The amount of mortar for abnormal concrete should be 4%-8% of the volume of RCC.
3.0.3 During the construction process, if the variety or source of raw materials needs to be changed, the mix ratio should be adjusted through experiments.
4 Abnormal concrete construction
4.1 General rules
4.1.1 The construction of abnormal concrete should adopt centralized slurry making method, and the following methods can be used for construction on site.
1 Manual grout adding and vibrating construction;
2 Portable grouting equipment grouting manual vibrating construction;
3 Construction of mechanical equipment integrating mortar grouting and vibrating;
4 When other methods are used for the construction of abnormal concrete, it shall be verified by experiments.
4.1.2 The abnormal concrete should be constructed simultaneously with the roller compacted concrete.
4.1.3 The treatment of abnormal concrete layer, joint surface, maintenance and special season construction shall meet the requirements of DL/T 5112.
4.2 Construction preparation
4.2.1 Before construction of abnormal concrete, site tests should be conducted to verify the adaptability of mix ratio, construction technology and site construction equipment, and determine the construction
Process technology and parameters.
4.2.2 The design of the surface of the roller compacted concrete warehouse shall include the construction content of abnormal concrete.
4.2.3 Before construction, check the condition of equipment such as pulping, transportation and on-site construction.
4.2.4 The preparatory work such as formwork, water stop, steel bar, embedded parts, holes, and access to the warehouse shall meet the continuous construction requirements.
4.3 Paving
4.3.1 The thickness of the abnormal concrete layer should be the same as the thickness of the roller compacted concrete.
4.3.2 The deformed concrete shall be constructed layer by layer along with the roller compacted layer, and the paving process shall be determined according to the mortar adding method.
4.3.3 When paving abnormal concrete, the concentrated parts of aggregate should be dispersed.
4.4 Pulping
4.4.1 The production capacity and scale of the pulping station should be adapted to the construction intensity of abnormal concrete.
4.4.2 The mixing should be carried out according to the mortar ratio and the mortar concentration should be kept stable.
4.4.3 The pulping station shall have environmental protection facilities such as waste pulp, wastewater treatment and dust prevention.
4.4.4 Pulping must be planned, and the time from preparation to use up of mortar should not be longer than 4h.
4.4.5 The density of mortar shall be checked every 2h～4h at the pulping station.
4.5 Slurry
4.5.1 No precipitation and bleeding shall occur before the grouting of abnormal concrete mortar.
4.5.2 The material and diameter of the mortar conveying pipe shall meet the conveying requirements, and a vent valve shall be set at an appropriate position outside the warehouse surface.
4.5.3 At the end of grouting or stop grouting for a long time, the grouting pipe should be cleaned in time.
4.6 Adding pulp
4.6.1 The process parameters of abnormal concrete grouting shall be determined through experiments.
4.6.2 Special mechanical drilling pressure grouting, jacking grouting, cutting grouting or layered grouting can be used for abnormal concrete.
4.6.3 When using jacks to add slurry, add slurry evenly according to the technological parameters determined by the test.
4.6.4 When cutting grout is used, arrange the grooves evenly along the length of the deformed concrete area, add grout evenly in the grooves, and cover them in a timely manner.
4.6.5 When using layered grout, the concrete is spread in two layers, and the grout is added before each layer is spread. The amount of mortar spread is determined according to the field test.
4.7 Vibration
4.7.1 A strong vibrator should be used for the vibrating of abnormal concrete. For layered continuous construction, the vibrator should be inserted into the lower concrete about 50mm. Vibrating room
The distance should not exceed 1.5 times of the effective radius of the vibrator. The vibrator should be inserted vertically and vibrated in a standardized and orderly manner. Vibration leakage and excessive vibration are not allowed.
4.7.2 When cutting slurry is used, the slurry is added and left for 10 minutes before vibrating, and the slurry is added to the end of vibrating within 40 minutes.
4.7.3 The abnormal concrete should be vibrated and compacted, and the surface of the concrete should be fully flooded after vibrating.
4.8 Construction of joint parts
4.8.1 The joint part of RCC and abnormal concrete should be vibrated with abnormal concrete first, and then the joint part shall be overlapped and rolled.
4.8.2 The rolling overlap width of the joint should be greater than.200mm, and the number of rolling passes should be increased by 1 to 2 times.
5 Quality inspection
5.1 Testing of raw materials and mortar
5.1.1 The inspection items and frequency of abnormal concrete mortar raw materials shall comply with DL/T 5112.
5.1.2 The allowable deviation for the weighing of abnormal concrete mortar ingredients is as specified in Table 5.1.2.
5.1.3 The inspection frequency of the mortar density on the warehouse surface is 1 time/2h～4h, and at least once for each pouring layer. The density tolerance is 2%.
5.2 On-site quality inspection of abnormal concrete
5.2.1 During the construction of abnormal concrete, inspection should be carried out according to the regulations in Table 5.2.1, and records should be kept.
5.2.2 After dismantling the deformed concrete, the appearance quality inspection shall be carried out in accordance with DL/T 5144.
1 General
1.0.3 Metamorphic concrete is a major technological innovation in the technology of RCC dam construction in my country. In view of the current technical quality of abnormal concrete
The level and construction level still need to be further improved. In order to facilitate the development of new technologies, new materials, new processes and new equipment in the construction of abnormal concrete
To create and apply, and to ensure the quality of the project, this article is specially formulated. The new equipment developed at present is a portable abnormal concrete intelligent high-pressure grouting system and its transformation
The automatic grouting and vibrating machine has been used in the Lizhou RCC double-curvature arch dam and the RCC gravity dam of the Guoduo Hydropower Station.
The application of the equipment can well solve the problems of the homogeneity of the mortar and the uniformity of the mortar in the artificial grouting process of abnormal concrete.
2 Material
2.0.1 Cement, admixtures, admixtures, etc. are important engineering raw materials. Manufacturers and varieties should be determined through optimization experiments, and based on optimization
Produced and supplied by a fixed manufacturer. The raw materials provided for construction shall have a product certificate.
2.0.4 stipulates the transportation and storage requirements of cement, admixtures, admixtures and other concrete raw materials used in abnormal concrete mortar. Qualified
The storage period of the admixture is more than six months and should be re-inspected before use. The admixture should be stirred evenly when used, and a solution of a certain concentration should be prepared.
Store in a container to avoid contamination. The storage and transportation of bagged cement exceeds 3 months, and the storage and transportation of bulk cement exceeds 6 months. Re-inspection should be carried out before use. strict
It is forbidden to use cement and admixtures that exceed the shelf life and agglomerate.
3 Mixing ratio of mortar
3.0.1 Since the mortar is added to the parent roller compacted concrete, the deformed concrete has a certain slump, and a vibrator can be used to vibrate and compact. therefore,
The main function of the mortar is to make the deformed concrete have vibrating workability, and it can meet the design requirements of various indicators. Pass Longtan Dam and Lizhou
Field tests of multiple projects such as the dam, Tingzikou dam, Guoduo dam, Guanyinyan dam, etc. show that. the deformed concrete is comparable to the same kind of RCC
The technical indicators are the same. As long as the water-cement ratio of the mortar added to the abnormal concrete is the same, the mortar and water-cement can be compared with the water-cement of the parent roller compacted concrete.
The cement ratio is reduced by 0.02, which can meet the vibratory compaction and other technical indicators of abnormal concrete; the water-cement ratio of mortar and water-cement is lower than that of parent roller compacted concrete
At 0.05, if the added amount is small, the slump requirement of vibrating cannot be met, so the amount of mortar can only be increased, which causes waste and also causes
The permeability of the mortar is poor, and the parent roller compacted concrete cannot fully contain the mortar.
3.0.2 This code collects the material consumption per cubic meter of abnormal concrete mortar of typical projects constructed in recent years, see Table 1.Summarized by engineering application
The amount of grout added is generally 4% to 8% of the amount of deformed concrete.
4 Abnormal concrete construction
4.1 General rules
4.1.1 There are three problems with artificial grout for abnormal concrete.
1 The amount of grout and the range of grout are not controllable, the construction is random, and the grout amount is too high;
2 The grouting process is rough, and the uniformity of mortar penetration is poor, which easily leads to large dispersion of construction quality and quality defects;
3 A large number of manual operations are used, with low work efficiency and high cost.
The mechanical grouting realizes its mechanization, digitalization and standardization operation, and solves the matching of the abnormal concrete grouting amount and the grouting range.
And the uniformity of mortar penetration, and at the same time greatly reduce the labor input, and also make up for the coordination with other mechanized construction of roller compacted concrete.
The construction efficiency is improved, the construction quality is guaranteed, and the construction cost is reduced. The abnormal hybrid developed by China Water Resources and Hydropower Seventh Engineering Bureau Co., Ltd.
The concrete automatic grouting and vibrating trolley has been successfully used in the construction of abnormal concrete in the dams of Tingzikou and Lizhou Hydropower Stations. The storage, transportation, grouting,
The vibrating and slurry pipeline cleaning device and digital control function are operating in good condition. The main technical parameters are. volume of slurry tank 0.5m³; cleaning
Water tank volume 0.21 m³; theoretical slurry flow. 2.97 m³/h; average grouting pressure. 0.1MPa; grouting head range. length 1.5m×width 0.5m×
0.3m deep; grouting hole spacing. longitudinal 0.375m, transverse 0.23m; vibrating rod insertion spacing. 0.75m; one grouting cycle time. 30s～40s
About; one vibrating time. 25s～35s; grouting amount control error. ±2%; vibration frequency 116Hz～134Hz.
4.1.2 In order to ensure a good combination of deformed and roller compacted concrete areas, the construction of deformed concrete on the same floor should closely follow the progress of roller compacted concrete construction.
The construction will be completed within the intermittent allowable time between the roller compacted concrete layers.
4.2 Construction preparation
4.2.1 This article emphasizes the importance of on-site production test. The on-site test can verify the combination of concrete mix design and mortar mix.
Reasonable, check the operational reliability and reliability of the concrete production system, mortar preparation system, transportation system and grout system (equipment) during the construction process
Compatibility. Determine the reasonable construction technology and parameters through experiments, such as the distance between the grout holes, the depth of the holes, and the amount of grouting. In addition, for lack of construction practice
Experienced personnel play a role in technical training. The abnormal concrete construction test can be combined with the roller compacted concrete test.
4.2.2 This article proposes the warehouse surface design, which mainly includes warehouse surface characteristics, technical requirements and pouring methods, resource allocation, quality and safety assurance measures, etc.
The content can be used as a basis for on-site inspection. Conscientious implementation can avoid the randomness of construction, ensure the strict implementation of construction technology, and help improve construction
Work efficiency to ensure construction safety and project quality.
4.2.3 The characteristic of RCC is rapid and continuous high-strength mechanized construction. The construction of abnormal concrete should be in line with the progress of roller compacted concrete
Keep consistent, the construction speed of abnormal concrete mainly involves adding mortar and vibrating. The production system is not matched, uncoordinated or malfunctions, all will
Affect the progress and quality of the project, pretending to be this provision.
4.2.4 This article emphasizes the importance of preparatory work such as formwork, water stop, steel bar, embedded parts, holes, access to the warehouse, etc., and proposes to be carried out when necessary
Specially designed requirements. For example. the abnormal concrete is mostly distributed on the front surface, and the formwork affects the appearance, quality, construction schedule and cost of the concrete.
All aspects have a significant impact and should meet the requirements of strength, stiffness and stability.
4.3 Paving
4.3.1 The thickness of the abnormal concrete pavement should be the same as that of the roller compacted concrete flat warehouse, and the elevation should be 30mm-50mm lower than the roller compacted concrete layer. change
When used as cushion concrete, its thickness is based on the principle that it is convenient for rolling after leveling. When used as cushion concrete at bank slopes, its thickness
It should not be greater than 1m. When deformed concrete is used on the upstream surface, the width of the deformed concrete should be greater than 500mm, preferably 1000mm, and should be based on
The requirements for reinforcement and embedded parts are determined.
4.3.2 Metamorphic concrete is to add mortar to roller compacted concrete to form rich mortar concrete, which can be compacted by vibrating method and should be coagulated with roller compaction.
The soil construction is carried out layer by layer. At present, the ways of adding grout to abnormal concrete should be divided into two categories. manual grout adding and mechanical grout adding. Manual grout adding includes layered grout,
Grouting and grouting for cutting grooves (grooves) and grouting; mechanical grouting is needle-in grouting, that is, grouting and grouting are completed simultaneously. Therefore, the abnormal concrete area
Roller-compacted concrete paving is determined by the method of adding grout under the premise of following the large-surface unwinding method.
4.3.3 When paving abnormal concrete, the concentrated parts of aggregate should be dispersed. According to engineering practice, abnormal concrete is mostly on the same layer as the large surface
It is formed by unwinding and paving, but it cannot be paving and leveling by the unwinding machine at one time. Generally, the roller compacted concrete is pushed to the abnormal concrete area by the unwinding machine.
Sloping material heads are prone to concentration of coarse aggregates, which may cause quality problems on the structural surface and steel mesh. Therefore, it needs to be supplemented by manual
The concentrated aggregate is evenly distributed.
4.4 Pulping
4.4.1 The preparation of mortar shall be based on the length of the abnormal concrete area to be constructed.
At the same time, the prepared mortar should be stored in a paddle-type mixing bucket to maintain the homogeneity of the mortar (the capacity of the mixing bucket is determined according to the needs of the project),
A flow meter is arranged at the slurry port of the mixing tank to record the mortar conveying volume. According to engineering practice, the pulping station should be arranged uniformly to simplify management.
4.4.2 The amount of mortar used in the construction of abnormal concrete is relatively large, and should receive the same attention as concrete. In order to ensure quality, freshly mixed
Qualified mortar.
4.4.3 According to engineering practice, the mixing amount of mortar is often more than its consumption, and the mortar is not suitable for use after storage for a long time.
It is necessary to clean up the pulping, pulp storage equipment and their transportation pipelines, that is, waste pulp and wastewater will inevitably be produced. At the same time, when the mortar is mixed, the bag of water
The process of putting mud and fly ash will inevitably produce ash, so the pulping station should be equipped with waste slurry, wastewater treatment facilities, dust prevention and other environmental protection measures.
4.4.4 After the mortar is prepared, if it is not used for a long time, it will cause hydration of the mortar, which will reduce the strength of the mortar and increase the difficulty of the mortar transportation construction.
degree.
4.4.5 The density of the mortar can be tested with a specific gravity scale, a hydrometer, etc., which should meet the required density of the mix ratio. The mortar must be evenly mixed before testing.
In case of high intensity of on-site construction, the density of mortar shall be checked once without exceeding 2 hours of continuous mortar supply.
4.5 Slurry
4.5.1 The mixed mortar will precipitate when it is not left to stand for a long time. If it is used directly without treatment, it may cause poor penetration uniformity of the mortar, and construction
Mass dispersion is large, and then there are quality defects. Therefore, the mixed mortar should be stored in a paddle-type mixing bucket, and then transported to the construction site through a pipeline.
The warehouse surface is equipped with a mobile container. In principle, the mortar is added as soon as it comes. When the warehouse surface mortar is not consumed for a long time, manual use of wooden sticks should be used.
Stirring in one direction or directly using paddle-type stirring barrel as storage container to ensure its homogeneity.
4.5.2 According to engineering practice, the first part of the mortar concentration may be somewhat low when the slurry is fed for the first time, and should be discarded until the concentration meets the mix ratio requirements.
Can be used. In addition, the slurry pipe should be cleaned during the intermittent period of construction to prevent the mortar from solidifying and blocking the pipe.
Set the vent valve to facilitate actual operation.
4.6 Adding pulp
4.6.2 The automatic grouting and vibrating trolley for abnormal concrete is a new...
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