阅读说明：本技术 一种利用小断面组合顶管实现大断面地下空间开挖的方法 (Method for realizing large-section underground space excavation by using small-section combined jacking pipe ) 是由 黄伟 杜宇 朱勇士 张哲强 李晓亮 张美琴 张总纲 张超东 山迪浩 于 2019-09-17 设计创作，主要内容包括：一种利用小断面组合顶管实现大断面地下空间开挖的方法,本发明涉及隧道施工技术领域,明挖施做顶管始发井与接收井；将各小断面顶管管节连接成为整体结构框架；在管节整体形成的支护条件下从上到下依次分层开挖地下结构内部土体；拆除立柱位置处的钢筋混凝土与型钢组合式管节中的钢管节以及中间的通用管节,施做立柱结构；拆除立柱与立柱之间的钢筋混凝土与型钢组合式管节中的钢管节以及中间的通用管节,设置角部加强支托,施做洞门环梁。施工占用场地小,对地面交通基本无影响,无需改迁市政管线,施工效率较高；同时利用结构自身支挡土体,省去了围护结构,节省了工程投资,也满足绿色施工的要求。(The invention discloses a method for realizing large-section underground space excavation by using small-section combined jacking pipes, which relates to the technical field of tunnel construction, and comprises the steps of constructing a jacking pipe starting well and a receiving well in open cut construction; connecting all the small-section pipe jacking pipe joints into an integral structural frame; sequentially excavating soil bodies in the underground structure layer by layer from top to bottom under the supporting condition of the pipe joint integrated structure; dismantling steel pipe joints and middle universal pipe joints in the reinforced concrete and section steel combined pipe joints at the positions of the stand columns and constructing stand column structures; and (3) removing the steel pipe joints and the middle universal pipe joints in the reinforced concrete and section steel combined pipe joints between the stand columns, arranging corner reinforcing supports, and constructing the portal ring beam. The construction occupies a small area, basically has no influence on ground traffic, does not need to change municipal pipelines, and has higher construction efficiency; meanwhile, the self-supporting structure is utilized to support and block the soil body, so that an enclosing structure is omitted, the engineering investment is saved, and the requirement of green construction is met.)

1. A method for realizing large-section underground space excavation by using small-section combined jacking pipes is characterized by comprising the following steps of: the construction steps are as follows:

(1) the method comprises the following steps of constructing a jacking pipe starting well and a receiving well by open cut construction, wherein the jacking pipe starting well and the receiving well are shared by all small-section jacking pipes;

(2) erecting small-section pipe jacking machine equipment on the starting well, and sequentially jacking along the underground space profile to perform construction to form an outer profile structure section;

(3) after all the jacking pipes are pushed into the tunnel, performing transverse connection between pipe joints from the interior of each jacking pipe, and connecting each small-section jacking pipe joint into an integral structural frame;

(4) sequentially excavating soil bodies in the underground structure layer by layer from top to bottom under the supporting condition of the pipe joint integrated structure;

(5) binding top and bottom longitudinal beam steel bars in the reinforced concrete and profile steel combined pipe joint between the top and the bottom, pouring the top and bottom longitudinal beams, and reserving upright column steel bars;

(6) dismantling steel pipe joints and middle general pipe joints in the reinforced concrete and section steel combined pipe joints at the positions of the stand columns and constructing stand column structures;

(7) removing steel pipe joints and middle general pipe joints in the reinforced concrete and section steel combined pipe joints between the stand columns, arranging corner reinforcing supports, and backfilling the inner cavities of the pipe joints with lightweight concrete;

(8) and constructing the portal ring beam, and constructing an internal structure according to the existing procedures.

2. The method for excavating the large-section underground space by using the small-section combined jacking pipe as claimed in claim 1, wherein the method comprises the following steps: the pipe jacking joints in the step (3) comprise reinforced concrete universal pipe joints and reinforced concrete and profile steel combined pipe joints, and the pipe joints are transversely connected through high-strength bolts, prestressed steel strands or locking notches and the like.

3. The method for excavating the large-section underground space by using the small-section combined jacking pipe as claimed in claim 1, wherein the method comprises the following steps: and (5) connecting the reinforced concrete pipe sections in the reinforced concrete and section steel combined pipe sections as permanent parts with the top longitudinal beam and the bottom longitudinal beam into a whole.

4. The method for excavating the underground space with the large section by using the small-section combined jacking pipe as claimed in claim 3, wherein the method comprises the following steps: the reinforced concrete pipe sections and the steel pipe sections are fixedly connected through bolts.

Technical Field

The invention relates to the technical field of tunnel construction, in particular to a method for realizing large-section underground space excavation by using a small-section combined jacking pipe.

Background

At present, underground engineering construction methods at home and abroad mainly comprise an open cut method, a cover cut method, a mine method, a shield method and a pipe jacking method, wherein the open cut method is simple in process, high in construction speed and good in economy, but the construction occupies a large field, occupies a long road for a long time, needs to transfer pipelines, and often does not have open cut construction conditions under complex urban environments; although the cover-excavation method reduces the influence of construction on urban traffic, the defects of multiple road breaking, municipal pipeline moving and changing and large environmental pollution are still inevitable; the method has the advantages that the method occupies small ground, has little influence on ground traffic, does not need to change pipelines, but has long construction period, great influence on the surrounding environment, high requirement on stratum, narrow construction space, unsuitability for mechanized construction and larger construction risk; the large-diameter shield and large-section pipe-jacking construction equipment occupies a large area, has low section size adaptability, needs to customize equipment according to the size requirement of a section limit, and has high equipment research and development cost, low repeated utilization rate and poor economy; in order to meet the requirement of urban modern construction and comprehensively consider the influence of construction on urban traffic, environmental protection and the like, a method for excavating underground space, which can reduce the occupied area of construction as much as possible, has small environmental influence, avoids repeated road breaking and pipeline moving and changing, is convenient to operate, economic and effective, is urgently sought.

Disclosure of Invention

The invention aims to provide a method for realizing large-section underground space excavation by utilizing a small-section combined jacking pipe, which is reasonable in design, small in construction occupied area, basically free of influence on ground traffic, free of changing municipal pipelines and high in construction efficiency, aiming at overcoming the defects and the defects of the prior art; meanwhile, the structure is used for supporting and retaining the soil body, so that an enclosing structure is omitted, the engineering investment is saved, the requirement of green construction is met, the method is suitable for various complex engineering environments, the engineering safety is guaranteed, meanwhile, the construction efficiency is high, the single-layer single-span structure, the multi-layer multi-span structure and other structures are suitable, the method is not limited by the engineering scale, and the method has good popularization value.

In order to achieve the purpose, the invention adopts the following technical scheme: the construction steps are as follows:

1. constructing a jacking pipe starting well and a receiving well by open cut construction, wherein the jacking pipe starting well and the receiving well are shared by all small-section jacking pipes;

2. erecting equipment such as a small-section pipe jacking machine and the like in an originating well, and sequentially jacking along the underground space profile for construction to form an outer profile structural section;

3. after all the jacking pipes are pushed into the tunnel to be communicated, transverse connection among pipe joints is performed from the interior of each jacking pipe, and all the small-section jacking pipe joints are connected into an integral structural frame;

4. sequentially excavating soil bodies in the underground structure layer by layer from top to bottom under the supporting condition of the pipe joint integrated structure;

5. binding top and bottom longitudinal beam steel bars in the reinforced concrete and profile steel combined pipe joint between the top and the bottom, pouring the top and bottom longitudinal beams, and reserving upright column steel bars;

6. dismantling steel pipe joints and middle universal pipe joints in the reinforced concrete and section steel combined pipe joints at the positions of the stand columns and constructing stand column structures;

7. removing steel pipe joints and middle general pipe joints in the reinforced concrete and section steel combined pipe joints between the stand columns, arranging corner reinforcing supports, and backfilling the inner cavities of the pipe joints with lightweight concrete;

8. and constructing the portal ring beam, and constructing an internal structure according to the existing procedures.

Further, the underground space profile in the step 2 is composed of a plurality of small-section jacking pipes with the same scale.

Further, the transverse connection among the pipe joints in the step 3 is realized through high-strength bolts, prestressed steel strands or locking notches and the like.

Furthermore, the pipe sections of the jacking pipe in the step 3 comprise general reinforced concrete pipe sections and combined reinforced concrete and section steel pipe sections, and the transverse connection among the pipe sections is realized through high-strength bolts, prestressed steel strands or locking notches and the like.

Further, the reinforced concrete pipe sections in the reinforced concrete and section steel combined pipe sections in the step 5 are used as permanent parts to be connected with the top longitudinal beam and the bottom longitudinal beam into a whole.

Furthermore, the corner reinforcing bracket in the step 7 adopts various forms such as a section steel structure, a reinforced concrete structure and the like.

Further, the reinforced concrete pipe joint 5-2 and the steel pipe joint 5-1 are fixedly connected through bolts.

After the process is adopted, the invention has the beneficial effects that: the invention provides a method for realizing large-section underground space excavation by using a small-section combined jacking pipe, which occupies a small construction area, basically has no influence on ground traffic, does not need to change municipal pipelines, and has higher construction efficiency; meanwhile, the structure is used for supporting and retaining the soil body, so that an enclosing structure is omitted, the engineering investment is saved, the requirement of green construction is met, the method is suitable for various complex engineering environments, the engineering safety is guaranteed, meanwhile, the construction efficiency is high, the single-layer single-span structure, the multi-layer multi-span structure and other structures are suitable, the method is not limited by the engineering scale, and the method has good popularization value.

Description of the drawings:

fig. 1 is a schematic plan view of the present invention.

Fig. 2 is a schematic view of the vertical cross-sectional layout of the present invention.

FIG. 3 is a cross-sectional view of the transverse arrangement of the jacking pipes in the present invention.

FIG. 4 is a schematic view of the transverse connection of the jacking pipe in the invention.

FIG. 5 is a schematic view of the construction of step 5 in the present invention.

FIG. 6 is a schematic view of the construction of step 8 in the present invention.

FIG. 7 is a schematic view of the construction of step 7 in the present invention.

FIG. 8 is a schematic view of the reserved bolt holes of the pipe jacking pipe joint located at the middle position in the invention.

Fig. 9 is an exploded view of the reinforced concrete and section steel combined pipe joint according to the present invention.

Description of reference numerals:

the pipe jacking system comprises a pipe jacking starting well 1, a pipe jacking receiving well 2, a reinforced concrete universal pipe joint 3, a pipe jacking device 4, a reinforced concrete and section steel combined pipe joint 5, a steel pipe joint 5-1, a reinforced concrete pipe joint 5-2, a high-strength bolt 6, a top longitudinal beam 7, a bottom longitudinal beam 8, column reserved steel bars 9, a middle universal pipe joint 10, a structural column 11, light concrete 12, a corner reinforcing support 13 and pipe joint reserved bolt holes 14.

The specific implementation mode is as follows:

the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 9, the following technical solutions are adopted in the present embodiment: the construction steps are as follows:

1. a pipe jacking starting well 1 and a pipe jacking receiving well 2 are constructed in open cut construction, wherein the pipe jacking starting well 1 and the pipe jacking receiving well 2 are shared by all small-section pipe jacking;

2. erecting a small-section jacking pipe jacking device 4 in a jacking pipe initial well 1, transversely arranging jacking pipe joints (the jacking pipe joints comprise reinforced concrete universal pipe joints 3 and reinforced concrete and profile steel combined pipe joints 5, reserving high-strength pipe joint reserved bolt holes 14 at joints of the two jacking pipe joints) according to the diagram shown in FIG. 3, and sequentially jacking along underground space contours to construct to form an outer contour structure section (the underground space contour is composed of a plurality of small-section jacking pipes with the same scale);

3. after all the pipe joints of the jacking pipes are pushed into the tunnel and communicated, transverse connection among the pipe joints is performed from the inside of each pipe joint of the jacking pipes (two pipe joint reserved bolt holes 14 are symmetrically formed at two ends of the pipe joint of the jacking pipe positioned in the middle, two pipe joint reserved bolt holes 14 are formed at one end and one side surface of the pipe joint of the jacking pipe positioned at the vertex angle position of the outline section, and each small-section pipe joint of the jacking pipes is connected into an integral structure frame by using high-strength bolts 6 (or prestressed steel strands and locking notches);

4. sequentially excavating soil bodies in the underground structure layer by layer from top to bottom under the supporting condition of the integral pipe joints of the jacking pipes;

5. binding top and bottom longitudinal beam steel bars in the reinforced concrete and profile steel combined pipe joint 5 between the top and the bottom, pouring a top longitudinal beam 7 and a bottom longitudinal beam 8, and reserving a stand column reserved steel bar 9 for facilitating subsequent connection;

6. dismantling a reinforced concrete pipe joint 5-1 and a reinforced concrete universal pipe joint 3 in the middle of a reinforced concrete and section steel combined pipe joint 5 at the position of a structural upright post 11, binding an upright post reserved steel bar 9, and constructing an upright post structure 11 (the reinforced concrete pipe joint 5-2 in the reinforced concrete and section steel combined pipe joint 5 is used as a permanent part to be connected with a top longitudinal beam 7 and a bottom longitudinal beam 8 into a whole, and the reinforced concrete pipe joint 5-2 and the reinforced concrete pipe joint 5-1 are connected and fixed by bolts);

7. dismantling the reinforced concrete and steel pipe joints 5-1 in the section steel combined pipe joint 5 and the reinforced concrete general pipe joint 3 in the middle between the upright post structures 11, arranging corner reinforcing brackets 13 (or a section steel structure and a reinforced concrete structure), and backfilling a pipe joint cavity by adopting light concrete 12;

8. and constructing the portal ring beam, and constructing an internal structure according to the existing procedures.

After the process structure is adopted, the beneficial effects of the specific implementation mode are as follows: the specific embodiment provides a method for realizing large-section underground space excavation by using a small-section combined jacking pipe, the construction occupies a small field, the ground traffic is basically not influenced, municipal pipelines do not need to be changed, and the construction efficiency is higher; meanwhile, the structure is used for supporting and retaining the soil body, so that an enclosing structure is omitted, the engineering investment is saved, the requirement of green construction is met, the method is suitable for various complex engineering environments, the engineering safety is guaranteed, meanwhile, the construction efficiency is high, the single-layer single-span structure, the multi-layer multi-span structure and other structures are suitable, the method is not limited by the engineering scale, and the method has good popularization value.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.