Construction method of concrete dam cross corridor layer

Abstract

The application discloses a kind of concrete dam cross corridor layer construction methods, comprising the following steps: S1, corridor bottom layer construction;S2, set up corridor top arch mould body;S3, pours storehouse surface concrete: in the left and right sides of storehouse gap layer by layer stacking prefabricated block, after every stacking a layer of prefabricated block, prefabricated block between the left and right sides of storehouse gap is set up steel trestle, as the storehouse access of concrete construction machinery and equipment, and by concrete construction machinery and equipment with the height of stacking prefabricated block layer by layer pours storehouse surface concrete;S4, remove steel trestle;S5, storehouse gap vertical mode: the corridor top arch mould body of this position is assembled at storehouse gap;S6, pours top layer concrete: pours top layer concrete on the storehouse surface concrete and top arch mould body that have been poured, and overall forms concrete dam cross corridor layer.This concrete dam cross corridor layer construction method process design is reasonable, can improve construction efficiency and construction quality and reduce construction cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of roller compacted concrete dam construction, and particularly relates to a concrete dam cross corridor layer construction method. BACKGROUND

[0002] The roller compacted concrete dam adopts thin layer pouring and rolling, and the construction bin surface is large. However, 1-4 corridor layers are arranged in the conventional design of the roller compacted concrete dam, the maximum cross section size of the corridor is 3.0m*4.0m, and the height is large. Because the corridor divides the large bin into multiple independent small bins, especially the bottom corridor layer is arranged to be up and down grouting and traffic corridor, and multiple longitudinal and transverse corridors are arranged, the construction operation surface is limited, the construction operation space is reduced, the bin surface is too narrow, and many roller compacted concrete construction mechanical equipments such as self-unloading vehicle, rolling machine, bin leveling machine and joint cutting machine are difficult to smoothly pour the roller compacted concrete. In the past, the block pouring is usually adopted, and the specific steps are as follows: the longitudinal and transverse corridors are integrally formed, the large bin is divided into multiple independent small bins, then the cross bridge (bin access road) for the mechanical equipment to pass through is constructed on the top and both sides of the corridor formwork. First, the height of the corridor is generally 4m, the construction cross bridge is difficult, time-consuming and laborious, and the construction period is long. Second, the height of the cross bridge is high, the mechanical equipment is not convenient to pass through, needs to be poured into the bin, causes low construction efficiency and long construction period. Third, the cross bridge is arranged on the corridor formwork, the strength is difficult to guarantee, the mechanical equipment needs to pass through slowly, the construction efficiency is affected, and the cost is high. Fourth, the pouring into the bin road causes the structure to be disorderly, the image to be poor, the quality guarantee rate to be low and other defects, the roller compacted concrete is difficult to enter the bin, and the straight line construction period is long. SUMMARY

[0003] The present application aims to overcome the shortcomings of the prior art, and provide a concrete dam cross corridor layer construction method which has reasonable process design, can improve construction efficiency and construction quality, and reduce construction cost.

[0004] To solve the above technical problems, the present application adopts the following technical scheme:

[0005] A concrete dam cross corridor layer construction method, comprising the following steps:

[0006] S1, corridor bottom layer construction: the pre-bound corridor bottom layer mesh steel is hoisted and installed in sections, the corridor bottom layer mesh steels at the construction positions of the longitudinal and transverse corridors are spliced, the corner bars are bound on the two sides of the bottom layer mesh steel, the drainage ditch formwork is arranged on the bottom layer mesh steel, the corridor bottom layer formwork is laid, then the concrete is poured on the bottom layer mesh steel to form the corridor bottom layer and the drainage ditch;

[0007] S2, corridor top arch formwork is built: the corridor top arch formwork is built on the corridor bottom layer, and the bin connecting gap is reserved on the transverse corridor top arch formwork;

[0008] S3, pouring the concrete of the warehouse face: placing the prefabricated blocks layer by layer on the left and right sides of the continuous warehouse gap, after placing a layer of prefabricated blocks, erecting a steel trestle between the prefabricated blocks on the left and right sides of the continuous warehouse gap as the access of the concrete construction machinery and equipment into the warehouse, and pouring the concrete of the warehouse face layer by layer along with the height of the prefabricated blocks placed by the concrete construction machinery and equipment;

[0009] S4, removing the steel trestle: after the concrete of the warehouse face rises to the top of the inverted arch of the gallery top arch formwork, the steel trestle is removed;

[0010] S5, erecting the formwork at the continuous warehouse gap: assembling the gallery top arch formwork at the continuous warehouse gap;

[0011] S6, pouring the top layer of concrete: pouring the top layer of concrete on the already poured concrete of the warehouse face and the gallery top arch formwork, and forming the concrete dam gallery layer as a whole.

[0012] As a further improvement of the above technical solution:

[0013] In step S2, after reserving the continuous warehouse gap, a sealing formwork is erected at one end of the gallery top arch formwork communicating with the continuous warehouse gap, and after step S3, the sealing formwork is removed and S5 is performed again.

[0014] After removing the sealing formwork, the continuous warehouse gap is cleaned, and S5 is performed again.

[0015] A water stop rubber ring is arranged on the side of the sealing formwork facing the continuous warehouse gap, and in step S3, the prefabricated blocks placed abut against the water stop rubber ring.

[0016] In step S3, the concrete of the warehouse face on the left and right sides of the continuous warehouse gap is poured synchronously and rises synchronously.

[0017] In step S2, before erecting the gallery top arch formwork, the trolley formwork is first hoisted and placed on the gallery bottom layer, and then the gallery top arch reinforcement is bound outside the trolley formwork, and the trolley formwork and the gallery top arch reinforcement form the gallery top arch formwork.

[0018] In step S2, wooden formwork is used to supplement the joints at the corner positions of the gallery top arch formwork.

[0019] The gallery includes longitudinal grouting drainage gallery, transverse grouting drainage gallery, foundation transverse drainage gallery and traffic gallery, the longitudinal grouting drainage gallery and the transverse grouting drainage gallery are 3.0m wide and 4.0m high, the foundation transverse drainage gallery and the traffic gallery are 2.5m wide and 3.0m high, and the longitudinal grouting drainage gallery, the transverse grouting drainage gallery, the foundation transverse drainage gallery and the traffic gallery are intersected to enclose each pouring warehouse.

[0020] The continuous warehouse gap is 6.0m long and 4.8m wide.

[0021] The prefabricated blocks are rectangular, 5m long, 0.3m wide and 0.3m high; the steel trestle is 8.01m long and 1.6m wide.

[0022] Compared with the prior art, the present application has the following advantages:

[0023] The concrete dam cross corridor layer construction method of the present application has the following advantages: first, the reserved connecting-bin gap serves as a connecting passage for left and right pouring bins, facilitating the passage of concrete construction machinery and equipment, enabling the left and right pouring bins to be poured simultaneously, improving construction efficiency and quality; second, pouring bin surface concrete layer by layer as the height of the stacked prefabricated blocks increases enables the concrete on both sides of the top arch mold to be symmetrically extruded, avoiding deformation of the top arch mold and improving construction effect; third, the reserved connecting-bin gap is first reserved, then the top arch mold at the connecting-bin gap is assembled after pouring concrete on both sides to pour top layer concrete, the process design is reasonable, and the construction is smooth and efficient; fifth, the reserved connecting-bin gap during pouring, the prefabricated blocks on both sides are stacked layer by layer, and the steel trestle is erected on the prefabricated blocks as a bin access channel, realizing the connection of the corridor layer bin surface, solving the problem of simultaneous pouring of the high-fall divided area of the corridor layer, speeding up the construction progress of the corridor layer and ensuring the construction quality. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a flowchart of the concrete dam cross corridor layer construction method of the present application.

[0025] Figure 2 is a layout diagram of the corridor of the concrete dam cross corridor layer construction method of the present application.

[0026] Figure 3 is a construction schematic diagram of a single connecting-bin gap of the concrete dam cross corridor layer construction method of the present application.

[0027] Figure 4 is a structural schematic diagram of the prefabricated blocks of the concrete dam cross corridor layer construction method of the present application.

[0028] Figure 5 is a structural schematic diagram of the steel trestle of the concrete dam cross corridor layer construction method of the present application.

[0029] The various reference numbers in the figure represent:

[0030] 1, bottom mesh reinforcement; 101, longitudinal grouting drainage gallery; 102, transverse grouting drainage gallery; 103, foundation transverse drainage gallery; 104, traffic gallery; 105, pouring bin; 2, corner bar; 3, gallery bottom formwork; 4, trolley formwork; 5, top arch form; 51, bin connecting gap; 6, precast block; 7, steel trestle; 8, water stop rubber ring; 9, sealing formwork; 10, bolt; 11, anchoring steel bar. DETAILED DESCRIPTION

[0031] The application will be further described below in conjunction with the accompanying drawings and specific examples.

[0032] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0033] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0034] In the present application, unless otherwise explicitly specified and limited, the terms "assembly", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0035] Example one:

[0036] Figures 1 to 5 An embodiment of the concrete dam cross gallery layer construction method of the present application is shown, the concrete dam cross gallery layer construction method of the embodiment includes the following steps:

[0037] S1, construction of the gallery bottom layer: the pre-bundled gallery bottom layer mesh reinforcement 1 is hoisted in sections, so that the gallery bottom layer mesh reinforcement 1 is spliced at the horizontal and vertical gallery construction position, then the corner reinforcement 2 is bound on both sides of the bottom layer mesh reinforcement 1, the drainage ditch formwork is arranged on the bottom layer mesh reinforcement 1, and the gallery bottom layer formwork 3 is laid, then the concrete is poured on the bottom layer mesh reinforcement 1 to form the gallery bottom layer and the drainage ditch;

[0038] S2, erect the gallery top arch formwork 5: the gallery top arch formwork 5 is erected on the gallery bottom layer, and the warehouse connecting gap 51 is reserved on the horizontal gallery top arch formwork 5;

[0039] S3, pouring of the warehouse surface concrete: the precast blocks 6 are stacked layer by layer on both sides of the warehouse connecting gap 51, the steel trestle 7 is erected between the precast blocks 6 on both sides of the warehouse connecting gap 51 as the warehouse access for the concrete construction machinery and equipment after each layer of precast blocks 6 is stacked, and the warehouse surface concrete is poured layer by layer with the height of the stacked precast blocks 6 by the concrete construction machinery and equipment;

[0040] S4, removal of the steel trestle 7: the steel trestle 7 is removed after the warehouse surface concrete rises to the top of the gallery top arch formwork 5;

[0041] S5, warehouse connecting gap 51 formwork erection: the gallery top arch formwork 5 at the warehouse connecting gap 51 is assembled;

[0042] S6, pouring of the top layer concrete: the top layer concrete is poured on the already poured warehouse surface concrete and the top arch formwork 5 to form the gallery layer of the concrete dam as a whole.

[0043] The concrete dam cross corridor layer construction method of the present application has the following advantages: first, the reserved continuous warehouse gap 51 serves as a connecting channel for the left and right pouring warehouses 105, facilitating the passage of concrete construction machinery and equipment, enabling the left and right pouring warehouses 105 to be poured simultaneously, improving construction efficiency and quality; second, pouring warehouse surface concrete layer by layer as the height of the stacked precast blocks 6 increases, enabling the concrete on both sides of the top arch formwork 5 to be symmetrically extruded, avoiding deformation of the top arch formwork 5, and improving construction effectiveness; third, the continuous warehouse gap 51 is first reserved, the top arch formwork 5 at the continuous warehouse gap 51 is assembled after pouring the concrete on both sides, and the top layer of concrete is poured, the process design is reasonable, and the construction is smooth and efficient; fifth, the continuous warehouse gap 51 is reserved during pouring, precast blocks 6 are stacked layer by layer on the left and right sides, the height of the precast blocks 6 is increased layer by layer during the concrete pouring process, a steel trestle 7 is erected on the precast blocks 6 as a warehouse access channel, realizing the connection of the warehouse surface of the corridor layer, solving the problem of simultaneous pouring of the high-fall divided areas of the corridor layer, speeding up the construction progress of the corridor layer, and ensuring the construction quality.

[0044] In this embodiment, after the continuous warehouse gap 51 is reserved, a sealing formwork 9 is erected at one end of the corridor top arch formwork 5 that communicates with the continuous warehouse gap 51, and the sealing formwork 9 is removed before S5. The sealing formwork 9 is erected at one end of the corridor top arch formwork 5 that communicates with the continuous warehouse gap 51 to prevent debris from entering the corridor top arch formwork 5.

[0045] In this embodiment, after the sealing formwork 9 is removed, the continuous warehouse gap 51 is cleaned, and then S5 is performed.

[0046] In this embodiment, a water stop rubber ring 8 is arranged on the side of the sealing formwork 9 facing the continuous warehouse gap 51, and the stacked precast blocks 6 abut against the water stop rubber ring 8 in step S3. This prevents water from entering the continuous warehouse gap 51 during pouring.

[0047] In this embodiment, in step S3, the warehouse surface concrete on both sides of the continuous warehouse gap 51 is poured simultaneously and rises simultaneously. This enables the concrete on both sides of the top arch formwork 5 to be symmetrically extruded, avoiding deformation of the top arch formwork 5 and ensuring construction quality.

[0048] In this embodiment, in step S2, before the corridor top arch formwork 5 is erected, the trolley formwork 4 is first hoisted onto the corridor bottom layer, and then the corridor top arch reinforcement is tied outside the trolley formwork 4, and the trolley formwork 4 and the corridor top arch reinforcement form the corridor top arch formwork 5.

[0049] In this embodiment, in step S2, wooden molds are used to fill the gaps at the corner positions of the corridor arch mold 5.

[0050] In this embodiment, the corridor includes a longitudinal grouting drainage corridor 101, a transverse grouting drainage corridor 102, a foundation transverse drainage corridor 103, and a traffic corridor 104. The longitudinal grouting drainage corridor 101 and the transverse grouting drainage corridor 102 are 3.0m wide and 4.0m high, while the foundation transverse drainage corridor 103 and the traffic corridor 104 are 2.5m wide and 3.0m high. The longitudinal grouting drainage corridor 101, the transverse grouting drainage corridor 102, the foundation transverse drainage corridor 103, and the traffic corridor 104 intersect to form each pouring chamber 105. Specifically, as shown... Figure 1 As shown, there are three longitudinal grouting drainage galleries 101, two transverse grouting drainage galleries 102, and two foundation transverse drainage galleries 103. The longitudinal grouting drainage galleries 101 are arranged transversely at intervals. The two transverse grouting drainage galleries 102 are located at the left and right ends of the longitudinal grouting drainage galleries 101 respectively and connect with the two external longitudinal grouting drainage galleries 101. The foundation transverse drainage galleries 103 are located between the two transverse grouting drainage galleries 102 and intersect with the three longitudinal grouting drainage galleries 101. The traffic corridor 104 connects to the junction of one longitudinal grouting drainage gallery 101 and one transverse grouting drainage gallery 102. Figure 1 The bottom right corner.

[0051] In this embodiment, the gap 51 of the warehouse is 6.0m long and 4.8m wide.

[0052] In this embodiment, the precast block 6 is rectangular, with a length of 5m, a width of 0.3m, and a height of 0.3m; the steel trestle bridge 7 is 8.01m long and 1.6m wide.

[0053] The precast block 6 is provided with insertion holes. The upper and lower precast blocks 6 are positioned by inserting pins 10 into the insertion holes to achieve splicing. Anchor steel bars 11 are provided on the outer side of the precast block 6. After the surface concrete is poured, the anchor steel bars 11 are embedded in the concrete and fixed to the surface concrete as one unit.

[0054] Example 2:

[0055] The 6m trolley template is pre-assembled at the processing plant, and lifting holes are welded on the trolley support. It is then transported to the wide platforms on the left and right banks using 20t flatbed trailers and hoisted into the warehouse using 30t cable cranes.

[0056] After the upper section of roller-compacted concrete is poured and roughened, the pre-tied bottom layer steel mesh 1 of the corridor is hoisted in sections, and then the corner bars 2 are tied. At the same time, the bottom layer formwork 3 of the corridor is erected, and the bottom layer concrete of the corridor and drainage ditch is poured.

[0057] After the bottom layer of concrete is poured and cured, the whole trolley formwork 4 is hoisted and installed, the corridor top arch reinforcement is bound, and wood formwork is used to supplement the joints at the corridor corner positions.

[0058] A continuous pouring gap 51 is reserved in the transverse corridor, and a circle of water stop rubber ring 8 is additionally arranged on the upstream and downstream sides of the continuous pouring gap 51 to prevent water leakage during pouring of the second-stage concrete. Prefabricated blocks 6 are stacked layer by layer on the left and right sides, and are gradually increased in height during the RCC pouring process. A steel trestle 7 is used as a pouring access, and the steel trestle 7 is unloaded, spread, and compacted on one side first, and then the concrete is transported to the other side for unloading, spreading, and compacting. After the compacting, the steel trestle 7 can be passed through, and the RCC in each bin is simultaneously raised.

[0059] The normal concrete or mechanism abnormal concrete (concrete poured outside the bin) around the corridor and the RCC (concrete poured inside the bin) are simultaneously raised, and are vibrated and compacted during pouring. After the corridor top arch elevation is reached, the steel trestle 7 is removed.

[0060] After the RCC is simultaneously raised, the formwork at the continuous pouring gap 51 is removed, the foundation is cleaned, the corridor formwork at this position is assembled, the reinforcement is bound, and the normal concrete is poured to make up the gap.

[0061] Compared with the conventional corridor construction method, the method does not need to occupy the dam bin surface construction working surface, the bottom layer of mesh reinforcement 1 and the trolley formwork 4 are assembled in advance, are transported to the bin, are hoisted and installed as a whole, are quickly installed, improve the bin preparation efficiency, shorten the key construction period, are safer and faster, and have high quality guarantee rate. The method meets the requirements of rapid and continuous RCC construction of the dam, is beneficial to the interlayer combination of the concrete, greatly reduces the engineering quantity of the corridor itself, and has the advantages of convenient construction, investment saving, and speed-up of the construction progress.

[0062] Although the present application has been disclosed with reference to the preferred embodiments, it is not intended to limit the present application. Any person skilled in the art can make many possible changes and modifications to the technical solutions disclosed above, or modify equivalent embodiments with equivalent changes, without departing from the scope of the technical solutions of the present application. Therefore, any simple modification, equivalent change, and modification made to the above embodiments according to the technical essence of the present application, without departing from the content of the technical solutions of the present application, should fall within the scope of protection of the technical solutions of the present application.

Claims

1. A method of constructing a concrete dam cross corridor layer, characterized by, It comprises the following steps: S1, gallery bottom layer construction: sub-section hoisting the gallery bottom layer mesh steel (1) which is bound in advance, so that the gallery bottom layer mesh steels (1) are spliced at the horizontal and vertical gallery construction positions, then the corner bars (2) are bound on both sides of the bottom layer mesh steel (1), the drainage ditch formwork is arranged on the bottom layer mesh steel (1), and the gallery bottom layer formwork (3) is laid, then the concrete is poured on the bottom layer mesh steel (1) to form the gallery bottom layer and the drainage ditch; S2, building gallery top arch form (5): building gallery top arch form (5) on the gallery bottom layer, and reserving a continuous warehouse gap (51) on the horizontal gallery top arch form (5); S3, pouring warehouse surface concrete: layer by layer stacking precast blocks (6) on the left and right sides of the continuous warehouse gap (51), after stacking a layer of precast blocks (6), steel trestle (7) is erected between the precast blocks (6) on the left and right sides of the continuous warehouse gap (51) as the warehouse access for concrete construction machinery and equipment, and the warehouse surface concrete is poured layer by layer with the height of the precast blocks (6) by the concrete construction machinery and equipment; the warehouse surface concrete on the left and right sides of the continuous warehouse gap (51) is poured synchronously and rises synchronously; S4, removing steel trestle (7): after the warehouse surface concrete rises to the top of the gallery top arch form (5), the steel trestle (7) is removed; S5, erecting formwork at the continuous warehouse gap (51): assembling the gallery top arch form (5) at the continuous warehouse gap (51); S6, pouring top layer concrete: pouring top layer concrete on the poured warehouse surface concrete and the gallery top arch form (5) to form the concrete dam gallery layer as a whole; In step S2, after reserving the continuous warehouse gap (51), a sealing formwork (9) is erected at one end of the gallery top arch form (5) which communicates with the continuous warehouse gap (51), and in step S3, the sealing formwork (9) is removed before S5.

2. The method of constructing a concrete dam cross gallery layer according to claim 1, characterized in that: After removing the sealing formwork (9), the continuous warehouse gap (51) is cleaned before S5.

3. The method of constructing a concrete dam cross gallery course according to claim 1, characterized in that: A water stop rubber ring (8) is arranged on the side of the sealing formwork (9) facing the continuous warehouse gap (51), and in step S3, the stacked precast blocks (6) abut against the water stop rubber ring (8).

4. The method of constructing a concrete dam cross gallery course according to claim 1, characterized in that: In step S2, before erecting the gallery top arch form (5), a trolley formwork (4) is hoisted and placed on the gallery bottom layer, and then the gallery top arch steel is bound outside the trolley formwork (4), and the trolley formwork (4) and the gallery top arch steel form the gallery top arch form (5).

5. The method of constructing a concrete dam cross gallery course according to claim 1, wherein: In step S2, wooden formwork is used to supplement the joints at the corner positions of the gallery top arch form (5).

6. The method of constructing a concrete dam cross gallery layer according to any one of claims 1 to 5, characterized in that: The gallery comprises longitudinal grouting drainage gallery (101), horizontal grouting drainage gallery (102), foundation horizontal drainage gallery (103) and traffic gallery (104), the longitudinal grouting drainage gallery (101) and the horizontal grouting drainage gallery (102) are 3.0m wide and 4.0m high, the foundation horizontal drainage gallery (103) and the traffic gallery (104) are 2.5m wide and 3.0m high, and the longitudinal grouting drainage gallery (101), the horizontal grouting drainage gallery (102), the foundation horizontal drainage gallery (103) and the traffic gallery (104) are intersected horizontally and vertically to enclose various pouring warehouses (105).

7. The method of constructing a concrete dam cross gallery layer according to any one of claims 1 to 5, characterized in that: The continuous bin gap (51) is 6.0 m long and 4.8 m wide.

8. The method of constructing a concrete dam cross gallery layer according to any one of claims 1 to 5, characterized in that: The prefabricated block (6) is rectangular, 5 m long, 0.3 m wide and 0.3 m high; the steel trestle (7) is 8.01 m long and 1.6 m wide.

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