阅读说明：本技术 一种二道坝过坝交通廊道结构及其施工方法 (Two-dam-crossing traffic corridor structure and construction method thereof ) 是由 周强 黄熠辉 刘明生 谢斌 殷亮 庄海龙 蒋胜祥 帅彬 魏海宁 范维 于 2020-05-25 设计创作，主要内容包括：一种二道坝过坝交通廊道结构及其施工方法,属水利水电工程建设技术领域,尤其是拱坝工程中的水垫塘、二道坝施工通道结构,以及它的施工方法。它是在二道坝靠岸坡的一个坝段的斜坡廊道下方部位设置交通廊道作为至水垫塘基坑底板的施工通道,交通廊道上游侧底板与水垫塘基坑底板齐平,下游侧底板与护坦底板齐平。本发明具有的有益效果是：1、交通廊道在二道坝靠岸坡的一个坝段布置,且布置在二道坝斜坡廊道下方,避免了交通廊道与二道坝本身设置的排水廊道、泵房等结构交叉,为施工提供便利性。2、交通廊道上游侧底板与水垫塘底板齐平,下游侧底板与护坦底板齐平,可直接形成畅通的交通路面,节约施工时间和施工成本。(A dam-crossing traffic corridor structure of a secondary dam and a construction method thereof belong to the technical field of hydraulic and hydroelectric engineering construction, in particular to a plunge pool and a secondary dam construction corridor structure in arch dam engineering and a construction method thereof. A traffic corridor is arranged at the lower part of a slope corridor of a dam section of a second dam close to a bank slope and serves as a construction passage to a foundation pit bottom plate of a plunge pool, a bottom plate on the upstream side of the traffic corridor is flush with the foundation pit bottom plate of the plunge pool, and a bottom plate on the downstream side of the traffic corridor is flush with a flat protection bottom plate. The invention has the beneficial effects that: 1. the traffic corridor is arranged at a dam section of the second dam close to the bank slope and below the slope corridor of the second dam, so that the traffic corridor is prevented from crossing with a drainage corridor, a pump room and other structures arranged on the second dam, and convenience is brought to construction. 2. The upstream side bottom plate of the traffic corridor is flush with the bottom plate of the water-filled reservoir, and the downstream side bottom plate of the traffic corridor is flush with the apron bottom plate, so that a smooth traffic road surface can be directly formed, and the construction time and the construction cost are saved.)

1. A dam-crossing traffic corridor structure of a two-way dam is characterized in that a traffic corridor (2) is arranged at the lower part of a slope corridor (3) of a dam section of the two-way dam close to a bank slope and serves as a construction channel to a foundation pit (9) of a plunge pool, a bottom plate on the upstream side of the traffic corridor (2) is flush with a bottom plate of the foundation pit (9) of the plunge pool, and a bottom plate on the downstream side of the traffic corridor is flush with a bottom plate of a apron (8).

2. The structure of a traffic corridor with two dams as claimed in claim 1, wherein the cross section of the traffic corridor (2) is 4.5-5 m wide and 5.5-6 m high, the top plate (2.2) of the traffic corridor is a straight cross section, the corners (2.1) at two sides of the traffic corridor are chamfered at 45 degrees, and the side length of the chamfer is 50-55 cm.

3. The structure of a dam-crossing traffic corridor of claim 1, wherein the copper seal (7) is arranged around the traffic corridor (2) and protected by a steel plate (11), and the sand bag (6) is covered and protected above the steel plate (11) at the bottom of the traffic corridor.

4. The structure of a dam-crossing traffic corridor of two dams of claim 1, wherein the concrete around the traffic corridor (2) is provided with reinforcing ribs transversely and longitudinally.

5. A construction method of a two-way dam-crossing traffic corridor structure is characterized by comprising the following steps:

1) calculating the section size of the traffic corridor, arranging the position of the traffic corridor according to the size of the traffic corridor, the size of the structure of the secondary dam and a layout chart of the secondary dam, and calculating the reinforcing steel bar arrangement of the traffic corridor according to the relationship between the position of the traffic corridor and the structure of the secondary dam;

2) the method comprises the following steps of (1) carrying out foundation cleaning on a secondary dam section provided with a traffic corridor, then constructing a secondary dam body (10) at a position below the elevation of a bottom plate of the traffic corridor, and embedding a copper water stop (7) along with a spare warehouse;

3) after the construction reaches the elevation of the bottom plate of the traffic corridor, starting to prepare a side wall (2.3) of the traffic corridor, and simultaneously constructing the bottom plate of the foundation pit (9) of the plunge pool at the upstream side and the bottom plate of the apron (8) at the downstream side of the traffic corridor in the construction process of the side wall;

4) constructing the side walls of the traffic corridor to be 0.5-1 m below the height of the top plate of the corridor, and constructing the top plate of the corridor and the rest side walls in a standby warehouse at the same time;

5) in the age-equal-strength period of the gallery top plate concrete, the dam foundation consolidation grouting of a second dam below the traffic gallery is carried out by utilizing the reserved space in the section steel portal;

6) the concrete of the gallery top plate reaches the design strength, after the supports and the templates are removed, the exposed copper water stop (7) of the traffic gallery is bent and is fixedly protected by a steel plate (11), and the upper part of the steel plate (11) at the gallery bottom plate is covered and protected by a sand bag (6); and when the reinforcing steel bars on the dam face of the upstream and downstream of the secondary dam are intersected with the traffic corridor, cutting and bending the reinforcing steel bars on the dam face of the secondary dam after the reinforcing steel bars are exposed out of the concrete face, well protecting the exposed reinforcing steel bars, completing the cut reinforcing steel bars on the dam face when the traffic corridor is plugged in the later period, and completing the implementation of the whole traffic corridor structure.

The technical field is as follows:

a dam-crossing traffic corridor structure of a secondary dam and a construction method thereof belong to the technical field of hydraulic and hydroelectric engineering construction, in particular to a plunge pool and a secondary dam construction corridor structure in arch dam engineering and a construction method thereof.

Background art:

for arch dam construction in water conservancy and hydropower engineering, buildings such as an upstream cofferdam, an arch dam, a plunge pool, a secondary dam, a fender, a downstream cofferdam and the like are generally and sequentially arranged at a river channel part from upstream to downstream, and a closed plunge pool foundation pit is formed between the arch dam and the secondary dam. During concrete construction, a large amount of personnel, materials, equipment and the like need to enter the foundation pit bottom plate of the plunge pool, but a permanent automobile transportation channel is not arranged (if the permanent automobile transportation channel is arranged, the influence on flood discharge and energy dissipation of the arch dam is firstly caused, and the economic cost is higher secondly), so that the arrangement of a channel in a construction period to enter the foundation pit bottom plate of the plunge pool is necessary. The prior art generally has two construction modes for the channel in the construction period: firstly, a lower foundation pit road is arranged from a downstream cofferdam back slope to a flat protection bottom plate, a dam section is reserved on the secondary dam without concrete construction, namely, a dam body notch is reserved to serve as a transport channel, the water cushion pond bottom plate is connected again to form a construction road, and after the construction of the water cushion pond part and the downstream part of the arch dam is completed, the notch dam body reserved on the secondary dam is constructed again. The disadvantages are that: 1. the height difference between the reserved gap of the secondary dam and the dam bodies on the left side and the right side of the gap is too large, generally exceeds 18m, does not meet the specification requirement, and needs structural stress rechecking; 2. under the condition that the height difference structural stress recheck meets the standard, if the height difference is too large, the construction period of the gap dam body constructed in the later period is longer, taking a 30 m-high secondary dam as an example, the gap part constructed in the later period generally needs 6-7 months. And secondly, a traffic transportation road passing through a dam at a low line arranged in a bank slope mountain body is descended according to the slope of about 10 percent of the road surface, a traffic hole is dug in the mountain body to be used as a transportation channel, and the traffic hole is blocked after the construction of the pond filling position, the downstream position of the arch dam and the upstream position of the secondary dam is completed. The disadvantages are that: in the general arch dam design, the low-line dam-passing traffic transportation road arranged in a bank slope mountain body and the top elevation of the side wall of the plunge pool are combined together and arranged in a flush manner, so that a maintenance channel from the low-line dam-passing traffic transportation road to the top of the plunge pool can be conveniently arranged; the height difference from the bottom plate of a common plunge pool to the top of the side wall usually exceeds 30m, so that the length of a channel for arranging a traffic hole to descend to the height of the bottom plate of the plunge pool from a low-line dam-passing traffic transportation road can be more than 300m, the excavation period of the channel can be more than 3 months, the cost can exceed 300 ten thousand yuan, the cost is high, and the traffic hole plugging construction must be carried out at the later stage.

The invention content is as follows:

the invention aims to solve the problems and provides a transportation channel which is low in cost, can be effectively formed to a foundation pit bottom plate of a plunge pool and is short in later plugging period and a construction method thereof.

The technical scheme is as follows:

a dam-crossing traffic corridor structure of a secondary dam is characterized in that a traffic corridor is arranged at the lower part of a slope corridor of a dam section of the secondary dam close to a bank slope and serves as a construction channel to a foundation pit bottom plate of a plunge pool, the upstream side bottom plate of the traffic corridor is flush with the foundation pit bottom plate of the plunge pool, and the downstream side bottom plate of the traffic corridor is flush with a flat protection bottom plate.

The cross section width of the traffic corridor is 4.5-5 m, the height of the traffic corridor is 5.5-6 m, the traffic corridor top plate adopts a straight cross section, corners on two sides of the traffic corridor are chamfered by 45 degrees, and the side length of the chamfer is 50-55 cm.

Copper water stop is arranged around the traffic corridor and protected by a steel plate, and a sand bag is used for covering and protecting the upper part of the steel plate at the bottom plate of the traffic corridor.

Reinforcing ribs are transversely and longitudinally arranged on the concrete around the traffic corridor.

The construction method of the second dam crossing traffic corridor structure comprises the following steps:

1) calculating the section size of the traffic corridor, arranging the position of the traffic corridor according to the size of the traffic corridor, the size of the structure of the secondary dam and a layout chart of the secondary dam, and calculating the reinforcing steel bar arrangement of the traffic corridor according to the relationship between the position of the traffic corridor and the structure of the secondary dam;

2) carrying out foundation cleaning on a secondary dam section provided with a traffic corridor, then constructing a secondary dam body at a position below the elevation of a bottom plate of the traffic corridor, and embedding copper water stop along with a spare warehouse;

3) after the construction reaches the elevation of the bottom plate of the traffic corridor, starting to prepare a side wall of the traffic corridor, and simultaneously constructing the bottom plate of the foundation pit of the plunge pool at the upstream side and the bottom plate of the apron at the downstream side of the traffic corridor in the construction process of the side wall;

4) constructing the side walls of the traffic corridor to be 0.5-1 m below the height of the top plate of the corridor, and constructing the top plate of the corridor and the rest side walls in a standby warehouse at the same time;

5) in the age-equal-strength period of the gallery top plate concrete, the dam foundation consolidation grouting of a second dam below the traffic gallery is carried out by utilizing the reserved space in the section steel portal;

6) the concrete of the gallery top plate reaches the design strength, after the supports and the templates are removed, the exposed copper water stop of the traffic gallery is bent and is fixedly protected by a steel plate, and the upper part of the steel plate at the gallery bottom plate is covered and protected by a sand bag; and when the reinforcing steel bars on the dam face of the upstream and downstream of the secondary dam are intersected with the traffic corridor, cutting and bending the reinforcing steel bars on the dam face of the secondary dam after the reinforcing steel bars are exposed out of the concrete face, well protecting the exposed reinforcing steel bars, completing the cut reinforcing steel bars on the dam face when the traffic corridor is plugged in the later period, and completing the implementation of the whole traffic corridor structure.

Compared with the prior art, the invention has the following beneficial effects:

1. the traffic corridor is arranged at a dam section of the second dam close to the bank slope and below the slope corridor of the second dam, so that the traffic corridor is prevented from crossing with a drainage corridor, a pump room and other structures arranged on the second dam, and convenience is brought to construction.

2. The upstream side bottom plate of the traffic corridor is flush with the bottom plate of the plunge pool, and the downstream side bottom plate of the traffic corridor is flush with the apron bottom plate, so that a smooth traffic road surface can be directly formed, the height difference between the road surfaces does not need to be connected in other ways, the running road of the plunge pool bottom plate is effectively formed, the construction efficiency of the plunge pool, the downstream of the arch dam, the upstream of the secondary dam and other parts is improved, and the construction time and the construction cost are saved.

1) The construction cost is saved: if the form of arranging the traffic holes is adopted, the direct cost is more than 300 ten thousand yuan, and the direct economic cost is less than 10 ten thousand yuan by adopting the structure and the method.

2) The construction time is saved: if the construction of the reserved gap dam section is adopted, the time of constructing the gap dam section in the later period is about 6-7 months, but by adopting the structure and the method, the later-period plugging construction period is about 3 months (the construction period contains concrete and grouting, no matter how long the length of the plugging section is, the construction period is about 3 months, and the plugging section can be constructed by section jumping or sequential staggering).

Description of the drawings:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a view of FIGS. 1A-A;

FIG. 3, is a view of FIGS. 1B-B;

FIG. 4 is an enlarged view of a portion I of FIG. 2;

FIG. 5 is an enlarged schematic view of a portion II of FIG. 2;

fig. 6 is a schematic view of the structure of the traffic corridor of the present invention.

The specific implementation mode is as follows:

referring to fig. 1-6, the invention relates to a dam-crossing traffic corridor structure of a two-way dam, as shown in fig. 1-3, the key technology is that a traffic corridor 2 is arranged at the lower part of a slope corridor 3 of a dam section of the two-way dam close to a bank slope as a construction passage to a foundation pit 9 bottom plate of a plunge pool, as shown in fig. 2, the upstream side bottom plate of the traffic corridor 2 is flush with the foundation pit 9 bottom plate of the plunge pool, and the downstream side bottom plate is flush with a bottom plate of a protection platform 8. The traffic corridor is arranged at the lower part of the slope corridor, so that the traffic corridor is prevented from being crossed with the drainage corridor 1, the pump room 5 and other structures arranged on the secondary dam.

The cross section width of the traffic corridor 2 is 4.5-5 m, the height is 5.5-6 m, the traffic corridor top plate 2.2 adopts a straight cross section, later-stage plugging construction and plugging quality are facilitated, the corners 2.1 on two sides of the traffic corridor are chamfered by 45 degrees, and the side length of the chamfer is 50-55 cm.

As shown in fig. 2, 4 and 5, a composite W-shaped copper water stop 7 is respectively arranged at the top of the traffic corridor 2 at a distance of 50-60 cm from the upstream dam face of the secondary dam along the periphery of the traffic corridor 2, the outer side of the copper water stop is bent and stuck to a wall and then protected by a steel plate 11, the steel plate is fixed on concrete by a dowel, and the upper part of the steel plate 11 at the bottom plate of the traffic corridor is covered and protected by a sand bag 6.

Because the distance between the structure side line of the traffic corridor 2 and the bottom plate of the top secondary dam slope corridor 3 and the transverse seam 4 is short, the peripheral concrete of the traffic corridor 2 is transversely provided with reinforcing ribs phi 32 multiplied by 20 and longitudinally provided with reinforcing ribs phi 28 multiplied by 20, and the corridor reinforcing ribs are disconnected at the copper water stop 7.

The construction method of the second dam crossing traffic corridor structure comprises the following steps:

1) calculating the section size of a traffic corridor according to the sizes of transport vehicles and transport objects entering a foundation pit bottom plate of the plunge pool, then arranging the position of the traffic corridor according to the size of the traffic corridor, the structural size of the secondary dam and a layout chart of the secondary dam, and calculating the reinforcing steel bar arrangement of the traffic corridor according to the relationship between the position of the traffic corridor and the structure of the secondary dam;

2) cleaning the foundation of the dam section of the secondary dam with the traffic corridor, constructing a dam body 10 of the secondary dam at the position below the elevation of the bottom plate of the traffic corridor, and embedding the copper water stop 7 along with the spare warehouse (the same below);

3) after the construction reaches the elevation of the bottom plate of the traffic corridor, starting to carry out the preparation of a side wall 2.3 of the traffic corridor (a dam body of a secondary dam with the same elevation as the side wall 2.3 of the traffic corridor is synchronously constructed with the traffic corridor), wherein the layering height of the side wall is 1.5-3 m, and in the construction process of the side wall 2.3, the bottom plate of a foundation pit 9 of a water cushion pond on the upstream side of the traffic corridor and the bottom plate of a protection dam 8 on the downstream side are simultaneously constructed;

4) when the side wall of the traffic corridor is constructed to be 0.5-1 m away from the height of a corridor top plate, the corridor top plate and the rest side walls are simultaneously subjected to warehouse construction, the first covering thickness of concrete above the height of the corridor top plate is 1m, the second covering thickness is 1.5-2.5 m, the lower part of the template support mode in the corridor top plate construction adopts a structural form of a section steel portal frame, the upper part of the template support mode adopts a structural form of a full-hall frame, the two are combined, and the support is removed after the concrete of the top plate reaches the designed strength;

5) in the age-equal-strength period of the gallery top plate concrete, the dam foundation consolidation grouting of a second dam below the traffic gallery is carried out by utilizing the reserved space in the section steel portal;

6) the concrete of the gallery top plate reaches the design strength, after the top plate support and the template are removed, the copper sealing water 7 exposed out of the traffic gallery is bent and is fixedly protected by a steel plate 11, and the upper part of the steel plate 11 at the gallery bottom plate is covered and protected by a sand bag 6; meanwhile, when the dam face reinforcing steel bars on the upstream and downstream sides of the secondary dam are intersected with the traffic corridor, the dam face reinforcing steel bars of the secondary dam are exposed out of the concrete surface by about 20cm and then cut off and bent, the exposed reinforcing steel bars are well protected in the construction period, and when the traffic corridor is plugged in the later period, the cut-off dam face reinforcing steel bars are completed according to the original design drawing of the secondary dam;

7) the whole traffic corridor structure is implemented, and in the subsequent passing process, the passing intermittent time is utilized to carry out roughening treatment on a corridor bottom plate, side walls and a corridor top plate in time so as to shorten the linear construction period of concrete backfill plugging in the later period.

As shown in fig. 3, since the traffic corridor is disposed at the dam section of the second-way dam near the bank slope and below the slope corridor, the position and structure of the traffic corridor are limited, and the intersection between the upstream and downstream sides of the traffic corridor and the entrance and exit of the second-way dam may encroach on the upstream side pond side wall structure line 12 and the downstream side flat-protecting side wall structure line, so as not to affect the traffic effect, the traffic corridor structure is taken as the main structure, and the traffic is preferentially ensured. And constructing the plunged pool side wall or the apron side wall structure 14 after the traffic corridor 2 is blocked, and constructing the upper side wall 15 in advance by arranging a construction joint 13 on the side wall of the non-plunged part.

The arrow direction in the figure is the water flow direction.