阅读说明：本技术 一种不影响主线通行的匝道连接部位的施工方法 (Construction method of ramp connecting part without influencing main line traffic ) 是由 张阿晋 王新新 孙廉威 程子聪 沈蓉 于 2021-07-22 设计创作，主要内容包括：本发明公开了一种不影响主线通行的匝道连接部位的施工方法,所述施工方法通过在主线两侧分别形成围护型地连墙和直线型地连墙,在围护型地连墙内开挖形成条形基坑,在条形基坑内施工钢管桩及支撑板对主线围护结构进行保护,拆除主线围护结构的部分盾构管片,并使主线围护结构与匝道围护结构形成拼接,从而在不影响主线通行的前提下,实现了匝道与主线结构连接部位的快速暗挖,相对于异形工作井对施工空间的苛刻要求,该方法降低了对施工环境空间要求,并降低了施工成本、提高了施工速度。(The invention discloses a construction method of a ramp connecting part without influencing main line traffic, which comprises the steps of forming an enclosure type diaphragm wall and a linear type diaphragm wall on two sides of a main line respectively, digging in the enclosure type diaphragm wall to form a strip-shaped foundation pit, constructing a steel pipe pile and a support plate in the strip-shaped foundation pit to protect a main line enclosure structure, dismantling partial shield segments of the main line enclosure structure, and splicing the main line enclosure structure and a ramp enclosure structure, thereby realizing the quick underground excavation of the ramp and main line structure connecting part on the premise of not influencing the main line traffic, reducing the requirement on construction environment space, reducing the construction cost and improving the construction speed relative to the harsh requirement on the construction space of a special-shaped working well.)

1. A construction method of a ramp connection part without influencing main line traffic is characterized in that a shield segment is adopted for a main line to form a containment structure, and the road surface of the main line is arranged on a road plate; the construction method comprises the following steps:

constructing an enclosure type diaphragm wall around a strip-shaped foundation pit on one side of a ramp of a main road, and constructing a linear type diaphragm wall on the other side of the main road;

excavating a strip foundation pit in the enclosure type diaphragm wall, constructing a transverse supporting structure, excavating the strip foundation pit to the bottom elevation, and reinforcing a pit bottom soil body;

thirdly, installing construction equipment in the strip-shaped foundation pit, horizontally driving the steel pipe piles into the soil, forming an upper row of steel pipe piles and a lower row of steel pipe piles on the upper side and the lower side of the enclosure structure of the main line road respectively, and supporting two ends of the upper row of steel pipe piles and the lower row of steel pipe piles on the enclosure type ground diaphragm walls and the linear type ground diaphragm walls on the two sides respectively; guide rails are arranged at the bottom of the upper row of steel pipe piles and at the top of the lower row of steel pipe piles;

step four, sequentially constructing a plurality of rows of supporting plates which are arranged in parallel at intervals along the length direction of the main line road, wherein the distance between two adjacent supporting plates is matched with the length of the shield segment; the upper end and the lower end of the supporting plate are respectively provided with a sliding groove matched with the guide rail, and the supporting plate is guided through the guide rail and the sliding groove; the supporting plate comprises a C-shaped notch, the diameter of the C-shaped notch is matched with the outer diameter of the shield segment, and the C-shaped notch of the supporting plate covers the shield segment;

fifthly, excavating a soil body between the adjacent supporting plates, and fixing the upper end and the lower end of each supporting plate with the guide rails at the top and the bottom respectively;

and step six, sequentially removing segments of the main line road tunnel, constructing a ramp enclosure structure, and finally performing earthwork backfilling.

2. The method of constructing a ramp junction not affecting the passage of a main line of claim 1,

the supporting plate comprises a plurality of supporting plate units, the supporting plate unit at the front end comprises a C-shaped notch, the supporting plate units are sequentially spliced, and the supporting plate at the tail part is fixed with the enclosure type ground connecting wall.

3. The method of constructing a ramp junction not affecting the passage of a main line according to claim 2,

the number of the support plate units is N +1, the support plate units are distinguished according to the driving sequence and are respectively marked as a No. 0 block, a No. 1 block, … and a No. N block, and the front end of the No. 0 block is provided with a C-shaped notch; in the fifth step, the excavation sequence of the soil body is as follows:

firstly, excavating soil bodies between N blocks of adjacent supporting plates, and then fixedly connecting the top and the bottom of each N block with the guide rails on the upper side and the lower side respectively;

then soil bodies among the No. N-1 block, the No. N-2 block, the No. … block and the No. 0 block between adjacent supporting plates are excavated in sequence, and after each excavation is finished, the top and the bottom of each supporting plate unit are respectively and fixedly connected with the guide rails on the upper side and the lower side.

4. The construction method of the ramp connection part not affecting the main line traffic of claim 1, wherein the distances between the upper row of steel pipe piles and the lower row of steel pipe piles and the main line enclosure structure are not less than 2.0 m.

5. The construction method of the ramp connection part not affecting the main line traffic according to claim 1, wherein the guide rail is rectangular, the rectangular steel pipe is welded and fixed with the upper row of steel pipe piles or the lower row of steel pipe piles, and the notch of the chute is rectangular.

Technical Field

The invention relates to a construction technology of an underground road, in particular to a construction method of a ramp connecting part which does not influence the main line passing.

Background

In urban road construction, underground express ways are increasingly constructed. At present, ramp construction of an underground road is mainly realized by excavating construction while a main line and a ramp structure are completed through a special-shaped working well, and the special-shaped working well is large in size, large in occupied area, long in construction period and high in safety risk and is increasingly limited when applied to a city core area. Especially for the newly added ramp in the later period, when the main road needs to pass, the cost for adopting the special-shaped working well is higher, and the potential safety hazard endangering the passing of the main road exists.

Disclosure of Invention

Aiming at the problems of high cost and danger of main line passing existing in a special-shaped working well adopted by underground ramp construction in the prior art, the invention provides a construction method of a ramp connecting part without influencing main line passing, which realizes quick underground excavation of the connecting part of a ramp and a main line structure on the premise of not influencing main line passing, and compared with the harsh requirement of the special-shaped working well on a construction space, the method reduces the requirement on the construction environment space, reduces the construction cost and improves the construction speed.

In order to solve the technical problems, the invention comprises the following technical scheme:

a construction method of a ramp connection part without influencing main line traffic is disclosed, wherein a shield segment is adopted for a main line to form a containment structure, and the road surface of the main line is arranged on a road plate; the construction method comprises the following steps:

constructing an enclosure type diaphragm wall around a strip-shaped foundation pit on one side of a ramp of a main road, and constructing a linear type diaphragm wall on the other side of the main road;

excavating a strip foundation pit in the enclosure type diaphragm wall, constructing a transverse supporting structure, excavating the strip foundation pit to the bottom elevation, and reinforcing a pit bottom soil body;

thirdly, installing construction equipment in the strip-shaped foundation pit, horizontally driving the steel pipe piles into the soil, forming an upper row of steel pipe piles and a lower row of steel pipe piles on the upper side and the lower side of the enclosure structure of the main line road respectively, and supporting two ends of the upper row of steel pipe piles and the lower row of steel pipe piles on the enclosure type ground diaphragm walls and the linear type ground diaphragm walls on the two sides respectively; guide rails are arranged at the bottom of the upper row of steel pipe piles and at the top of the lower row of steel pipe piles;

step four, sequentially constructing a plurality of rows of supporting plates which are arranged in parallel at intervals along the length direction of the main line road, wherein the distance between two adjacent supporting plates is matched with the length of the shield segment; the upper end and the lower end of the supporting plate are respectively provided with a sliding groove matched with the guide rail, and the supporting plate is guided through the guide rail and the sliding groove; the supporting plate comprises a C-shaped notch, the diameter of the C-shaped notch is matched with the outer diameter of the shield segment, and the C-shaped notch of the supporting plate covers the shield segment;

fifthly, excavating a soil body between the adjacent supporting plates, and fixing the upper end and the lower end of each supporting plate with the guide rails at the top and the bottom respectively;

and step six, sequentially removing segments of the main line road tunnel, constructing a ramp enclosure structure, and finally performing earthwork backfilling.

Furthermore, the supporting plate comprises a plurality of supporting plate units, the supporting plate unit at the front end comprises a C-shaped notch, the supporting plate units are sequentially spliced, and the supporting plate at the tail part is fixed with the enclosure type underground connecting wall.

Furthermore, the number of the support plate units is N +1, the support plate units are distinguished according to the driving sequence and are respectively marked as a No. 0 block, a No. 1 block, … and a No. N block, and the front end of the No. 0 block is provided with a C-shaped notch; in the fifth step, the excavation sequence of the soil body is as follows:

firstly, excavating soil bodies between N blocks of adjacent supporting plates, and then fixedly connecting the top and the bottom of each N block with the guide rails on the upper side and the lower side respectively;

then soil bodies among the No. N-1 block, the No. N-2 block, the No. … block and the No. 0 block between adjacent supporting plates are excavated in sequence, and after each excavation is finished, the top and the bottom of each supporting plate unit are respectively and fixedly connected with the guide rails on the upper side and the lower side.

Further, the distance between the upper row of steel pipe piles and the distance between the lower row of steel pipe piles and the main line enclosure structure are not less than 2.0 m.

Further, the guide rail is rectangular steel pipe, the rectangular steel pipe is welded and fixed with the upper row of steel pipe piles or the lower row of steel pipe piles, and the notch of the sliding groove is rectangular.

Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects: in summary, according to the construction method of the ramp connection portion without affecting the main line traffic provided by the invention, the enclosure type diaphragm wall and the linear type diaphragm wall are respectively formed on the two sides of the main line, the strip-shaped foundation pit is formed in the enclosure type diaphragm wall in an excavating mode, the steel pipe pile and the support plate are constructed in the strip-shaped foundation pit to protect the main line enclosure structure, partial shield segments of the main line enclosure structure are removed, and the main line enclosure structure and the ramp enclosure structure are spliced, so that the rapid underground excavation of the ramp connection portion with the main line structure is realized on the premise that the main line traffic is not affected, and compared with the harsh requirement of a special-shaped working well on the construction space, the method reduces the requirement on the construction environment space, reduces the construction cost and improves the construction speed.

Drawings

FIG. 1 is a diagram showing the positional relationship among a main line, a ramp, a rectangular diaphragm wall, and a linear diaphragm wall according to the present invention;

FIG. 2 is a cross-sectional view of the construction stage of the stripe-shaped foundation pit according to the present invention;

FIG. 3 is a cross-sectional view of the upper row and the lower row of steel pipe piles at the construction stage according to the present invention;

FIG. 4 is a schematic view of the support plate construction stage of the present invention;

FIG. 5 is a cross-sectional view taken along A-A of FIG. 4;

FIG. 6 is a cross-sectional view taken along line B-B of FIG. 4;

fig. 7 is a schematic view of the structure of the guide rail and the chute in the invention.

The numbers in the figures are as follows:

1-a main road; 2-ramp; 3-soil body;

11-shield segments; 12-a roadway plate;

21-enclosing and protecting type connecting walls; 22-a strip foundation pit; 23-linear diaphragm wall; 24-reinforcing the soil body; 25-a lateral support structure;

31-upward row of steel pipe piles; 32-lower row of steel pipe piles; 33-a guide rail;

40-a support plate; 41-a chute; 42-bolt.

Detailed Description

The construction method of the ramp connection portion that does not affect the main line traffic provided by the present invention is further described in detail with reference to the accompanying drawings and the specific embodiments. The advantages and features of the present invention will become more apparent in conjunction with the following description. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.

The present embodiment provides a construction method of a ramp connection portion that does not affect main line traffic, and the construction method will be further described with reference to fig. 1 to 7.

It should be noted that, a shield segment 11 is adopted for forming a containment structure for a main line road located underground, a road surface of the main line is arranged on a roadway plate 2, a ramp 2 outlet needs to be newly added at a later stage, the ramp 2 is arranged on the right side of the main line road 1 (below the main line in fig. 1), and a traditional open cut mode cannot be applied under the conditions of large underground burial depth and main line traffic. The method comprises the steps of arranging a strip-shaped foundation pit 22 maintained by a ground diaphragm wall on one side of a ramp, constructing horizontal steel pipe piles (including an upper row of steel pipe piles 31 and a lower row of steel pipe piles 32) and a supporting plate 40 in the strip-shaped foundation pit 22, supporting a main line shield segment 11, and enabling an enclosure structure of the ramp 2 and an enclosure structure of a main line road 1 to form a whole, so that the construction speed of the joint of the main line road 1 and the ramp 2 is increased, and the influence degree on traffic of the main line road is reduced.

The construction method comprises the following steps:

step one, as shown in fig. 1, a surrounding type diaphragm wall 21 around a strip-shaped foundation pit 22 is constructed on one side of the ramp 2 of the main road 1, and a linear type diaphragm wall 23 is constructed on the other side of the main road 1. In fig. 1, the enclosure type ground wall is a rectangular structure.

And step two, as shown in fig. 2, excavating the strip-shaped foundation pit 22 in the enclosure type diaphragm wall, constructing a transverse supporting structure 25, excavating the strip-shaped foundation pit 22 to the bottom elevation, and reinforcing the soil body at the pit bottom to form a reinforced soil body 24. By way of example, the transverse support structure 25 may be a steel support or a concrete beam; the reinforced soil body 24 may be a hardened concrete or concrete floor.

Thirdly, as shown in fig. 3 and 7, installing construction equipment in the strip-shaped foundation pit 22, horizontally driving the steel pipe piles into the soil, forming an upper row of steel pipe piles 31 and a lower row of steel pipe piles 32 on the upper side and the lower side of the enclosure structure of the main road respectively, and supporting two ends of the upper row of steel pipe piles 31 and the lower row of steel pipe piles 32 on the enclosure type ground diaphragm wall and the linear type ground diaphragm wall 23 on the two sides respectively; guide rails 33 are arranged at the bottom of the upper row of steel pipe piles 31 and at the top of the lower row of steel pipe piles 32. The distance between the upper row of steel pipe piles 31 and the lower row of steel pipe piles 32 and the main line enclosure structure is not less than 2.0 m. The guide rail 33 may be a protruding rectangular steel pipe. In a preferred embodiment, the steel pipe piles 31 in the upper row are tightly connected or connected, or the maximum allowable distance between adjacent steel pipe piles is set, so that the pile distance is controlled.

Step four, as shown in fig. 6 in combination with fig. 4, a plurality of rows of support plates 40 arranged in parallel at intervals are sequentially constructed along the length direction of the main road, and the distance between two adjacent support plates 40 is matched with the length of the shield segment 11; the supporting plate 40 comprises a plurality of supporting plate 40 units, the upper end and the lower end of each supporting plate 40 unit are respectively provided with a sliding groove 41 matched with the guide rail 33, and the supporting plate 40 units are guided by the guide rail 33 and the sliding grooves 41; the supporting plate 40 unit at the front end comprises a C-shaped notch, the diameter of the C-shaped notch is matched with the outer diameter of the shield segment 11, the C-shaped notch of the supporting plate 40 unit at the front end covers the shield segment 11, other supporting plate 40 units are sequentially spliced, and the supporting plate 40 at the tail part is fixed with the enclosure type ground connecting wall. In fig. 5, the supporting plate 40 comprises 4 supporting plate 40 units which are sequentially spliced, wherein the supporting plate 40 units are respectively a 0 number block, a 1 number block, a 2 number block and a 3 number block, the end part of the 0 number block supporting plate 40 unit comprises a C-shaped notch, and the adjacent supporting plate 40 units are fixed at the splicing part through bolts. Preferably, earth excavation is performed in the area of the No. 2 block between any two adjacent support plates 40, and after the excavation is completed, the No. 2 block is connected with the guide rails 33 of the upper and lower rows of steel pipe piles 32. Meanwhile, the No. 3 block is dismantled, and a temporary vertical supporting structure is arranged. And sequentially finishing the earthwork excavation of the No. 1 block and the No. 0 block area.

And step five, as shown in fig. 4 to 7, excavating soil between the adjacent support plates 40, and fixing the upper and lower ends of the support plate 40 unit with the guide rails 33 at the top and the bottom respectively.

And step six, sequentially removing segments of the main line road tunnel, constructing a surrounding structure of the ramp 2, and finally performing earthwork backfilling. The main line tunnel segment is partially dismantled, and the structure at the junction of the main line tunnel segment and the ramp structure is dismantled. The ramp structure is connected with the main line tunnel through the anisotropic connecting piece, and can be realized through the prior art. The supporting plate can be combined with the construction of the ramp structure, namely the ramp structure is firstly constructed and then the supporting plate is gradually dismantled.

In summary, according to the construction method of the ramp connection portion without affecting the main line traffic provided by the invention, the enclosure type diaphragm wall and the linear type diaphragm wall 23 are respectively formed on the two sides of the main line, the strip-shaped foundation pit 22 is formed in the enclosure type diaphragm wall in an excavating mode, the steel pipe pile and the support plate 40 are constructed in the strip-shaped foundation pit 22 to protect the main line enclosure structure, part of shield segments 11 of the main line enclosure structure are removed, and the main line enclosure structure and the ramp 2 enclosure structure are spliced, so that the fast underground excavation of the ramp 2 and main line structure connection portion is realized on the premise of not affecting the main line traffic, and compared with the harsh requirement of a special-shaped working well on the construction space, the method reduces the requirement on the construction environment space, reduces the construction cost and improves the construction speed.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.