Cemented sand gravel integrated paving gallery structure and construction method

Abstract

The invention relates to the technical field of water conservancy and hydropower engineering, in particular to a cemented sand gravel integrated paving gallery structure, the section form of a gallery is a rectangular structure, the gallery is provided with a bottom plate and two side walls paved by slurry-added vibrating cemented sand gravel, and surface layer steel bars are arranged on a free face of the slurry-added vibrating cemented sand gravel; a prefabricated reinforced concrete top plate is hoisted at the top, and slurry-adding vibration cemented sand gravels are arranged above and on the two sides of the top plate; dam body cemented sand gravels are laid on the outer sides of the bottom plate and the side walls on the two sides, and the dam body cemented sand gravels and the slurry adding and vibrating cemented sand gravels need to be constructed and ascended synchronously in a layered mode. The construction technology of the cast-in-place gallery is simplified, the gallery and the cemented sand gravel dam can be constructed synchronously, the advantage of continuous construction of the cemented sand gravel dam is well played, the construction period is shortened, and the construction efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of water conservancy and hydropower engineering, and in particular to a cemented sand and gravel integrated paving corridor structure and a construction method. Background Art

[0002] As a new dam construction technology, cemented gravel dam makes full use of gravel and stone materials at the project site, adds a small amount of cementitious materials for rolling or vibrating construction, and has the advantages of safety, reliability, low investment, continuous paving, short construction period, and environmental friendliness. Corridors are usually set up in cemented gravel dams, and their main function is to provide channels and working surfaces for curtain grouting, maintenance, transportation, drainage and pressure reduction. The common practices in general engineering are divided into prefabricated corridors and cast-in-place corridors. Prefabricated corridors do not require the erection of formwork, and the construction process is simple. However, during the construction of corridors, engineering problems such as installation dislocation, stress concentration, and leakage are prone to occur; and when the cross-sectional size of the corridor is large and the construction site is narrow, the production and hoisting of the prefabricated corridor will be difficult to carry out. The cast-in-place corridor is integrated with the dam body, and the structural integrity is good, which can avoid the above-mentioned adverse situations. However, the amount of cementitious materials used in cemented gravel is small, and it is difficult to bond with steel bars to form an effective whole. In addition, cemented gravel generally needs to be rolled. In order to avoid compression deformation, the steel bar layout needs to avoid the rolling area.

[0003] In view of this, an object of the present invention is to provide an integrated gallery structure of a cemented gravel dam to overcome the above problems. Summary of the invention

[0004] The present invention provides a structure and construction method for an integrated paved gallery of a cemented gravel dam, simplifies the cast-in-place gallery construction process, enables the gallery and the cemented gravel dam to be constructed synchronously, better utilizes the advantages of continuous construction of the cemented gravel dam, shortens the construction period, and improves construction efficiency.

[0005] The technical solution of the present invention is: an integrated paving gallery structure of a cemented gravel dam, the cross-section of the gallery adopts a rectangular structure, and is provided with a bottom plate and side walls paved with mortar-vibrated cemented gravel, and surface steel bars are arranged on the free surface of the mortar-vibrated cemented gravel; a prefabricated reinforced concrete top plate is hoisted on the top, and mortar-vibrated cemented gravel is arranged above and on both sides of the top plate; the dam body cemented gravel is paved on the outside of the bottom plate and the side walls on both sides, and the dam body cemented gravel and the mortar-vibrated cemented gravel need to be constructed and raised synchronously in layers.

[0006] In a further solution, the thickness of the mortar-vibrated cemented gravel in the corridor bottom plate, side wall and top plate is ≥1m.

[0007] In a further solution, the top plate is prefabricated using C30 concrete.

[0008] In a further solution, a passable concrete layer is paved on the bottom plate, and drainage ditches are reserved on both sides of the passable concrete layer.

[0009] Another technical solution of the present invention is: a construction method for the construction of the corridor structure, comprising the following steps: S1. Tie up the corridor structural steel bars according to the steel bar diameter, size, spacing and protective layer thickness requirements given in the design drawings; S2. Divide the material boundary area according to the thickness requirements of the cemented gravel and vibrated mortar, and make markings on the construction site; set up formwork and support for the corridor floor and the side walls on both sides; S3. Spread cemented gravel to form cemented gravel inside the dam body, and at the same time spread cemented gravel on the gallery floor and the side walls on both sides to form a mortar-added and vibrated cemented gravel area; S4. Roll the cemented gravel inside the dam body, and add grout and vibrate the gallery floor and the side walls before the cemented gravel begins to set. The steel bar binding area needs to be fully vibrated. S5. The above steps S3 and S4 should be paved layer by layer in accordance with the layering scheme, and the upper layer of cemented gravel should be paved before the initial setting of the cemented gravel; if the cemented gravel has already initially set, it is necessary to lay the cushion mortar before paving the upper layer of cemented gravel; if the cemented gravel has already finally set, it is necessary to roughen it and lay the cushion mortar before paving the upper layer of cemented gravel; S6. While paving the cemented gravel on both sides of the corridor, pour the corridor floor concrete, reserve drainage ditches on both sides, and complete the construction before the corridor is capped; S7. When the cemented gravel is paved to the elevation of the corridor top plate, the prefabricated reinforced concrete top plate is hoisted, the upper layer of cemented gravel is paved, and the cemented gravel around the corridor is mortared and vibrated; S8. Continue to pave the cemented gravel dam body. When the cemented gravel around the corridor reaches the age, remove the internal support and formwork of the corridor.

[0010] In a further solution, in step S4, the thickness of the key vibration parts of the corridor grouting and vibrating cemented gravel and steel bar area is ≥0.5m.

[0011] In a further solution, in step S4 and step S7, the overlap width of the joint between the grouting and vibrating cemented gravel and the dam body cemented gravel is ≥30cm, and compaction should be carried out specifically after the grouting and vibrating, with the compacted overlap width of 20cm~30cm.

[0012] In a further solution, in step S4, during the construction of grouting and vibrating the cemented gravel at the reinforcement binding site, measures should be taken to properly protect the reinforcement, the large aggregates in this area should be manually removed and the vibration should be fully carried out to avoid the formation of water seepage channels.

[0013] As a further solution, in step S3, during the paving process, it is necessary to prevent large-sized rocks near the corridor from falling onto the steel bars and causing deformation.

[0014] Compared with the prior art, the present invention has the following advantages: (1) The integrated construction structure of the corridor and the dam body has better integrity. Compared with the prefabricated corridor, the construction quality is easier to ensure, which greatly reduces the possibility of adverse conditions such as stress concentration and leakage around the corridor; (2) The present structure only adopts grouting and vibration measures in a local area around the corridor, and a prefabricated concrete cover plate is used on the top of the corridor. The cemented gravel dam body can be continuously paved and constructed, and the construction speed is fast; (3) The amount of cemented gravel cementitious material used is small, and there is no need to take temperature control measures such as water cooling, which can save investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic cross-sectional structure diagram of an embodiment of the present invention.

[0016] Figure 2 It is a schematic diagram of the cross-sectional structure of the construction partitions of an embodiment of the present invention.

[0017] In the figure: dam body bonded gravel 1, grouting and vibrating cemented gravel 2, bottom plate 3, side wall 4, top plate 5, traffic concrete layer 6, drainage ditch 7, steel bars 8, bonded gravel / grouting and vibrating cemented gravel construction layer 9, grouting and vibrating cemented gravel reinforcement area 10. DETAILED DESCRIPTION

[0018] In order to enable ordinary technicians in the field to more clearly understand the objectives, technical solutions and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited to the following embodiments.

[0019] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operate in a specific position, and therefore should not be understood as limiting the present invention. like Figure 1~2As shown, the integrated paving gallery structure of the cemented gravel dam provided in this embodiment has a rectangular gallery cross-section, including a bottom plate 3 and side walls 4 paved with cemented gravel 2 with grouting and vibration, surface steel bars 8 are arranged on the free surface of the cemented gravel with grouting and vibration, a prefabricated reinforced concrete top plate 5 is hoisted on the top, and cemented gravel with grouting and vibration is arranged above and on both sides of the top plate, and an effective closed body is formed by grouting and vibration, which has good integrity and is conducive to structural stress and anti-seepage; a temporary support of the top plate 5 is arranged on the inner side of the gallery, and an embedded part can be added to the reinforced concrete top plate to connect with the gallery support part to fix the position of the top plate; The dam body cemented gravel 1 (i.e., the large volume of cemented gravel of the dam body outside the corridor) is paved on the outside of the bottom plate 3 and the side walls 4. The dam body cemented gravel 1 and the mortar-vibrated cemented gravel 2 need to be constructed and raised in layers synchronously. The cemented gravel / mortar-vibrated cemented gravel construction layer 9 is as follows: Figure 2 shown.

[0020] The dimensions of the corridor structure are determined according to the actual scenario, for example, 2.5m×3.5m (width×height). The thickness of the mortar-vibrated cemented gravel 2 in the corridor floor 3, side wall 4 and top plate 5 is not less than 1m. The dimensions of the reinforced concrete top plate at the top of the corridor are 2m×3.5m×0.5m (length×width×thickness), and the top plate is prefabricated with C30 concrete.

[0021] This embodiment also provides a construction method for constructing the corridor structure, comprising the following steps: S1. Tie the corridor structural steel bars 8 according to the steel bar diameter, size, spacing and protective layer thickness requirements given in the design drawings; S2. Divide the material boundary area according to the thickness requirements of the cemented gravel 2 with mortar and vibration, and make markings on the construction site; set up formwork and support for the corridor floor 3 and the side walls 4 on both sides; S3, paving cemented gravel to form cemented gravel 1 inside the dam body, and paving cemented gravel on the gallery floor 3 and the side walls 4 on both sides to form a mortar-added and vibrated cemented gravel 2 area. During the paving process, attention should be paid to the large-sized boulders near the gallery to avoid them falling on the steel bars 8 and causing deformation; S4. Roll the cemented gravel 1 inside the dam body, and perform grouting and vibrating construction on the gallery floor 3 and the side walls 4 on both sides before the cemented gravel is initially set. The steel bar 8 binding area needs to be fully vibrated. The grouting and vibrating cemented gravel reinforcement area 10 should be vibrated as follows: Figure 2 As shown, the thickness of the key vibrating part is ≥0.5m; During the construction of cemented gravel and mortar at the steel bar binding site, measures should be taken to properly protect the steel bars, large aggregates in this area should be removed manually and the vibration should be carried out carefully and fully to avoid the formation of water seepage channels; S5. The above steps S3 and S4 should be paved layer by layer in accordance with the layering scheme, and the upper layer of cemented gravel should be paved before the initial setting of the cemented gravel; if the cemented gravel has already initially set, it is necessary to lay the cushion mortar before paving the upper layer of cemented gravel; if the cemented gravel has already finally set, it is necessary to roughen it and lay the cushion mortar before paving the upper layer of cemented gravel; S6. While paving the cemented gravel on both sides of the corridor, pour the corridor floor concrete 6, reserve drainage ditches 7 on both sides, and complete the construction before the corridor is capped; S7, when the cemented gravel is paved to the elevation of the corridor top plate, the prefabricated reinforced concrete top plate 5 is hoisted, the upper layer of cemented gravel is paved, and the cemented gravel around the corridor is mortared and vibrated; S8. Continue to pave the cemented gravel dam body 1. When the cemented gravel around the corridor reaches the age, remove the internal support and formwork of the corridor.

[0022] In step S4 and step S7, the overlap width of the joint between the mortar-added and vibrated cemented gravel and the dam body cemented gravel is ≥30cm, and rolling compaction should be carried out after the mortar-added and vibrated, with the rolled overlap width of 20cm~30cm.

[0023] The above is only a preferred embodiment of the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An integrated paving corridor structure for a cemented gravel dam, characterized by: The corridor adopts a rectangular cross-section structure, with a bottom plate and two side walls paved with mortar-vibrated cemented gravel. The surface layer of steel bars is arranged on the free surface of the mortar-vibrated cemented gravel. A prefabricated reinforced concrete top plate is hoisted on the top, and mortar-vibrated cemented gravel is set above and on both sides of the top plate. The dam body-bonded gravel is paved on the outside of the bottom plate and the side walls. The dam body-bonded gravel and the mortar-vibrated cemented gravel need to be constructed and raised in layers synchronously.

2. The integrated paving corridor structure of a cemented gravel dam according to claim 1 is characterized by: The thickness of the mortar-vibrated cemented gravel in the corridor bottom plate, side wall and top plate is ≥1m.

3. The integrated paving corridor structure of a cemented gravel dam according to claim 1 is characterized by: The top plate is prefabricated using C30 concrete.

4. The integrated paving gallery structure of a cemented gravel dam according to claim 1 is characterized by: A passable concrete layer is paved on the bottom plate, and drainage ditches are reserved on both sides of the passable concrete layer.

5. A construction method for the construction of the corridor structure according to any one of claims 1 to 4, characterized in that The following steps are involved: S1. Tie up the corridor structural steel bars according to the steel bar diameter, size, spacing and protective layer thickness requirements given in the design drawings; S2. Divide the material boundary area according to the thickness requirements of the cemented gravel and vibrated mortar, and make markings on the construction site; set up formwork and support for the corridor floor and the side walls on both sides; S3. Spread cemented gravel to form cemented gravel inside the dam body, and at the same time spread cemented gravel on the gallery floor and the side walls on both sides to form a mortar-added and vibrated cemented gravel area; S4. Roll the cemented gravel inside the dam body, and add grout and vibrate the gallery floor and the side walls before the cemented gravel begins to set. The steel bar binding area needs to be fully vibrated. S5. The above steps S3 and S4 should be paved layer by layer in accordance with the layering scheme, and the upper layer of cemented gravel should be paved before the initial setting of the cemented gravel; if the cemented gravel has already initially set, it is necessary to lay the cushion mortar before paving the upper layer of cemented gravel; if the cemented gravel has already finally set, it is necessary to roughen it and lay the cushion mortar before paving the upper layer of cemented gravel; S6. While paving the cemented gravel on both sides of the corridor, pour the corridor floor concrete, reserve drainage ditches on both sides, and complete the construction before the corridor is capped; S7. When the cemented gravel is paved to the elevation of the corridor top plate, the prefabricated reinforced concrete top plate is hoisted, the upper layer of cemented gravel is paved, and the cemented gravel around the corridor is mortared and vibrated; S8. Continue to pave the cemented gravel dam body. When the cemented gravel around the corridor reaches the age, remove the internal support and formwork of the corridor.

6. The construction method according to claim 5, characterized in that: In step S4, the thickness of the key vibration parts of the corridor grouting and vibrating cemented gravel and steel bar area is ≥0.5m.

7. The construction method according to claim 5, characterized in that: In step S4 and step S7, the overlap width of the joint between the mortar-added and vibrated cemented gravel and the dam body cemented gravel is ≥30cm, and rolling compaction should be carried out after the mortar-added and vibrated, with the rolled overlap width of 20cm~30cm.

8. The construction method according to claim 5, characterized in that: In step S4, during the construction of grouting and vibrating cemented gravel at the reinforcement binding site, measures should be taken to properly protect the reinforcement, large aggregates at this site should be manually removed and vibrated sufficiently to avoid the formation of water seepage channels.

9. The construction method according to claim 5, characterized in that: In step S3, during the paving process, it is necessary to prevent large-sized rocks near the corridor from falling onto the steel bars and causing deformation.

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