A cemented sand and gravel integrated paving corridor structure and construction method

Abstract

The present invention relates to the technical field of water conservancy and hydropower engineering, and specifically to an integrated cemented gravel paving corridor structure. The corridor has a rectangular cross-section and comprises a base plate and side walls paved with grouting and vibrating cemented gravel. Steel reinforcement is arranged on the free-facing surface of the grouting and vibrating cemented gravel. A precast reinforced concrete top plate is hoisted from the top, and grouting and vibrating cemented gravel is arranged above and on both sides of the top plate. Dam body cemented gravel is paved on the outside of the base plate and side walls. The dam body cemented gravel and the grouting and vibrating cemented gravel are constructed and raised synchronously in layers. The present invention simplifies the cast-in-place corridor construction process, allowing for simultaneous construction of the corridor and the cemented gravel dam. This effectively leverages the advantages of continuous construction of the cemented gravel dam, shortens the construction period, and improves construction efficiency.

Description

Technical Field

[0001] The present 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] Cemented gravel dams, a new dam construction technology, fully utilize on-site gravel and sand, adding a small amount of cementitious material for rolling or vibrating construction. They offer advantages such as safety, reliability, low investment, continuous paving, short construction periods, and environmental friendliness. Galleries are often installed in cemented gravel dams, primarily to provide access and working surfaces for curtain grouting, maintenance, transportation, drainage, and pressure reduction. Common construction methods include prefabricated galleries and cast-in-place galleries. Prefabricated galleries require no formwork and simplify construction. However, galleries are prone to engineering problems such as misalignment, stress concentration, and leakage during construction. Furthermore, large galleries and confined construction sites can make prefabricated galleries difficult to fabricate and install. Cast-in-place galleries, constructed integrally with the dam body, offer greater structural integrity and can avoid these challenges. However, the low cementitious content of cementitious gravel makes it difficult to bond effectively with the rebar. Furthermore, cemented gravel typically requires compaction during construction, and to prevent compression deformation, rebar must be placed away from the compaction zone.

[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 corridor of a cemented gravel dam, which simplifies the construction process of the cast-in-place corridor and enables the corridor and the cemented gravel dam to be constructed synchronously, thereby better leveraging the advantages of continuous construction of the cemented gravel dam, shortening the construction period, and improving construction efficiency.

[0005] The technical solution of the present invention is: an integrated paving corridor structure for a cemented gravel dam, the corridor cross-section 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 in layers synchronously.

[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 constructing the corridor structure, comprising the following steps:

[0010] S1. Tie the corridor structural steel bars according to the steel bar diameter, size, spacing and cover thickness requirements given in the design drawings;

[0011] S2. Divide the material boundary areas according to the thickness requirements of the cemented gravel and mortar, and mark the construction site; set up formwork and support for the corridor floor and side walls;

[0012] S3. Spread cemented gravel to form cemented gravel inside the dam body. Simultaneously, spread cemented gravel on the gallery floor and side walls to form a grouting and vibrating cemented gravel area.

[0013] S4. Roll the cemented gravel inside the dam body and vibrate the gallery floor and side walls before the cemented gravel begins to set. The reinforcement binding area must be vibrated thoroughly.

[0014] S5. Steps S3 and S4 above should be paved layer by layer according to the layering plan, and the upper layer of cemented gravel should be laid before the initial setting of the cemented gravel. If the cemented gravel has already initially set, a cushion mortar should be laid before the upper layer of cemented gravel should be laid. If the cemented gravel has already completely set, it should be roughened and a cushion mortar should be laid before the upper layer of cemented gravel should be laid.

[0015] 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;

[0016] S7. When the cemented gravel is paved to the corridor top plate elevation, the precast 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;

[0017] 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.

[0018] 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.

[0019] In a further solution, 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 ≥30 cm, and should be specially compacted after the mortar-added and vibrated, with the compacted overlap width being 20 cm to 30 cm.

[0020] In a further solution, 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 in this area should be manually removed and vibrated sufficiently to avoid the formation of water seepage channels.

[0021] 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.

[0022] Compared with the existing technology, 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) This 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 paved continuously 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

[0023] Figure 1 It is a schematic cross-sectional structural diagram of an embodiment of the present invention.

[0024] Figure 2 It is a schematic diagram of the cross-sectional structure of the construction zones according to an embodiment of the present invention.

[0025] In the figure: dam body cemented 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, cemented gravel / grouting and vibrating cemented gravel construction layer 9, grouting and vibrating cemented gravel reinforcement area 10. DETAILED DESCRIPTION

[0026] In order to enable ordinary technicians in this field to more clearly understand the objectives, technical solutions and advantages of the present invention, the present invention is further explained below with reference to the accompanying drawings and embodiments, but the present invention is not limited to the following embodiments.

[0027] 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 to indicate positions or location relationships are based on the positions or location relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0028] like Figures 1 and 2As shown, the integrated paved gallery structure of the cemented gravel dam provided in this embodiment has a rectangular cross-section, including a bottom plate 3 and side walls 4 paved with grouting and vibrating cemented gravel 2. Surface reinforcement 8 is arranged on the free-facing surface of the grouting and vibrating cemented gravel. A prefabricated reinforced concrete top plate 5 is hoisted on the top. Grouting and vibrating cemented gravel is arranged above and on both sides of the top plate. The grouting and vibration form an effective closed body with good integrity, which is beneficial to structural stress and anti-seepage. A temporary support for the top plate 5 is provided on the inside of the gallery. An embedded part can be added to the reinforced concrete top plate to connect it to the gallery support to fix the position of the top plate.

[0029] The outside of the bottom plate 3 and the side walls 4 are paved with dam body cemented gravel 1 (i.e., the large volume of cemented gravel on the dam body outside the corridor). The dam body cemented gravel 1 and the mortar-vibrated cemented gravel 2 need to be constructed and raised in layers simultaneously. The cemented gravel / mortar-vibrated cemented gravel construction layer 9 is as follows: Figure 2 shown.

[0030] The corridor's structural dimensions are determined based on actual scenarios, for example, 2.5m x 3.5m (width x height). The thickness of the mortared and vibrated cemented gravel 2 within the corridor's floor 3, side walls 4, and roof 5 should be no less than 1m. The reinforced concrete roof at the top of the corridor measures 2m x 3.5m x 0.5m (length x width x thickness) and is precast using C30 concrete.

[0031] This embodiment also provides a construction method for constructing the corridor structure, comprising the following steps:

[0032] S1. Tie the corridor structural steel bars 8 according to the steel bar diameter, size, spacing and cover thickness requirements given in the design drawings;

[0033] S2. Divide the material boundary area according to the thickness requirements of the mortar-vibrated cemented gravel 2 and mark the construction site; set up formwork and support for the corridor floor 3 and the side walls 4 on both sides;

[0034] S3. Pave cemented gravel to form cemented gravel 1 inside the dam body. Simultaneously, pave cemented gravel on the gallery floor 3 and side walls 4 to form grouting and vibrating cemented gravel 2. During the paving process, pay attention to large-sized boulders near the gallery to prevent them from falling on the steel bars 8 and causing deformation.

[0035] S4. Roll the cemented gravel 1 inside the dam body and perform grouting and vibrating on the gallery floor 3 and the side walls 4 before the cemented gravel begins to set. The reinforcement 8 binding area needs to be vibrated thoroughly. The grouting and vibrating cemented gravel reinforcement area 10 should be vibrated thoroughly. Figure 2 As shown, the thickness of the key vibration area is ≥0.5m;

[0036] During the construction of cemented gravel with grouting and vibrating at the reinforcement binding site, measures should be taken to properly protect the reinforcement, large aggregates in this area should be manually removed, and vibration should be carried out carefully and thoroughly to avoid the formation of water seepage channels.

[0037] S5. Steps S3 and S4 above should be paved layer by layer according to the layering plan, and the upper layer of cemented gravel should be laid before the initial setting of the cemented gravel. If the cemented gravel has already initially set, a cushion mortar should be laid before the upper layer of cemented gravel should be laid. If the cemented gravel has already completely set, it should be roughened and a cushion mortar should be laid before the upper layer of cemented gravel should be laid.

[0038] S6. While paving the cemented gravel on both sides of the corridor, pour the corridor floor concrete 6, and reserve drainage ditches 7 on both sides. The construction is completed before the corridor is capped;

[0039] S7. When the cemented gravel is paved to the corridor top plate elevation, the precast 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;

[0040] S8. Continue paving the cemented gravel dam body 1. After the cemented gravel around the corridor reaches the age, remove the internal support and formwork of the corridor.

[0041] In step S4 and step S7, the overlap width of the joint between the cemented gravel and the dam body cemented gravel should be ≥30cm, and should be specially rolled and compacted after the grouting and vibration, with the rolled overlap width of 20cm~30cm.

[0042] The above description is merely a preferred embodiment of the present invention. For those skilled in the art, the present invention may be modified and varied in various ways. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of protection 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 of the mortar-vibrated cemented gravel facing the free surface is arranged with surface reinforcement. A precast 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-added and vibrated bonded gravel need to be constructed and raised in layers synchronously.

2. The integrated paving corridor structure for cemented gravel dam according to claim 1, characterized in that: 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 for cemented gravel dam according to claim 1, characterized in that: The top plate is prefabricated using C30 concrete.

4. The integrated paving corridor structure for cemented gravel dam according to claim 1, characterized in that: 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 the corridor structural steel bars according to the steel bar diameter, size, spacing and cover thickness requirements given in the design drawings; S2. Divide the material boundary areas according to the thickness requirements of the cemented gravel and mortar, and mark the construction site; set up formwork and support for the corridor floor and side walls; S3. Spread cemented gravel to form cemented gravel inside the dam body. Simultaneously, spread cemented gravel on the gallery floor and side walls to form a grouting and vibrating cemented gravel area. S4. Roll the cemented gravel inside the dam body and vibrate the gallery floor and side walls before the cemented gravel begins to set. The reinforcement binding area must be vibrated thoroughly. S5. Steps S3 and S4 above should be paved layer by layer according to the layering plan, and the upper layer of cemented gravel should be laid before the initial setting of the cemented gravel. If the cemented gravel has already initially set, a cushion mortar should be laid before the upper layer of cemented gravel should be laid. If the cemented gravel has already completely set, it should be roughened and a cushion mortar should be laid before the upper layer of cemented gravel should be laid. 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 corridor top plate elevation, the precast 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 cemented gravel and the dam body cemented gravel should be ≥30cm, and should be specially rolled and compacted after the grouting and vibration, 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 the 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 vibration should be performed 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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