Underground structure construction method

Abstract

The invention discloses an underground structure construction method. The method comprises the following steps: arranging a pipe-roofing tool pipe at the center line position of a cross section structure of an underground road to be built; a first batch of pipe roof tool pipes are jacked along the longitudinal axis of the underground road to be built; jacking a first batch of pipe-roofing combined section steel pipes, and replacing a first batch of pipe-roofing tool pipes; jacking a second batch of pipe-roofing tool pipes into gaps of the first batch of pipe-roofing combined section steel pipes; jacking a second batch of pipe-roofing combined section steel pipes, and replacing a second batch of pipe-roofing tool pipes; and the adjacent parts of the first batch of pipe-roofing combined section steel pipes and the adjacent second batch of pipe-roofing combined section steel pipes are fixed through first fasteners to form a combined section steel pipe overall frame. According to the invention, the safety of underground construction is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of underground engineering construction, and in particular to an underground structure construction method. Background Art

[0002] With rapid economic development and the continued acceleration of urbanization, large and megacities are exhibiting a powerful siphoning effect on population and social resources. At the same time, traffic congestion has become the most persistent obstacle to urban development, and the contradiction between transportation demand and spatial resources is becoming increasingly acute. Traditional surface road systems are no longer able to meet the growing traffic volume and the needs of expanding urban functions. The construction of underground road systems is an effective way to resolve urban traffic congestion and optimize urban spatial layout.

[0003] There is a growing demand for denser road and transportation infrastructure networks, building a complex above- and underground transportation system, and fully developing and utilizing three-dimensional space resources. It is common for new underground roads to pass under existing surface roads, railway lines, rail transit lines, or other buildings.

[0004] The construction of new underground roads faces the dual challenges of complex geological conditions and the protection of surrounding environmental risk sources. Under the premise of ensuring safety, the construction of new underground roads is required to minimize the demolition and modification of adjacent buildings (structures) or pipelines, avoid the impact on existing traffic as much as possible, and reduce the disturbance to the surrounding environment as much as possible, so as to ensure construction safety, environmental safety, and achieve low-impact construction.

[0005] In the relevant technologies, the main methods used for underground road structure construction include open-cut method, mining method (blind excavation method) and shield method. In areas with dense existing buildings (structures), a combined construction method of "advanced pipe curtain + integral jacking box culvert" is often used. This method can form an advanced support structure in the stratum without affecting the normal traffic of the ground road, providing conditions for subsequent excavation and structural jacking. However, there are many shortcomings in the existing technical methods: for example, the pipe curtain layout requires high precision, the construction period is long, and the jacking construction causes great disturbance to the surrounding strata, which can easily lead to settlement or even collapse of the upper road or adjacent buildings (structures). Summary of the Invention

[0006] The present invention aims to provide an underground road structure construction method that can solve the problem in related technologies that underground road structure construction causes collapse and settlement of upper road traffic infrastructure and existing buildings (structures), thereby affecting normal operation.

[0007] According to one aspect of the present invention, there is provided an underground structure construction method, comprising: arranging pipe curtain tool tubes at the midline position of the cross-sectional structure of a proposed underground road; jacking a first batch of pipe curtain tool tubes along the longitudinal axis of the proposed underground road, wherein the first batch of pipe curtain tool tubes are arranged at intervals and constructed by a skip-hole jacking method; jacking a first batch of pipe curtain composite cross-section steel tubes along the longitudinal axis of the proposed underground road to replace the first batch of pipe curtain tool tubes, wherein the outer diameter of the first batch of pipe curtain composite cross-section steel tubes is equal to the outer diameter of the first batch of pipe curtain tool tubes; jacking a second batch of pipe curtain tool tubes into the gaps between the first batch of composite cross-section steel tubes; jacking a second batch of pipe curtain composite cross-section steel tubes to replace the second batch of pipe curtain tool tubes, wherein the outer diameter of the second batch of pipe curtain composite cross-section steel tubes is equal to the outer diameter of the second batch of pipe curtain tool tubes, and the first batch of pipe curtain composite cross-section steel tubes and the second batch of pipe curtain tool tubes are equal. The pipe-curtain composite cross-section steel pipes form a closed curtain; the adjacent parts of the first batch of pipe-curtain composite cross-section steel pipes and the adjacent second batch of pipe-curtain composite cross-section steel pipes are fixed by first fasteners to form a composite cross-section steel pipe overall frame; the reinforced concrete closed frame structure of the proposed underground road is prefabricated; the second fasteners of the first batch of pipe-curtain composite cross-section steel pipes and the third fasteners of the second batch of pipe-curtain composite cross-section steel pipes are removed; the reinforced concrete closed frame structure of the proposed underground road is pushed forward as a whole to replace the first replacement part in the first batch of composite cross-section steel pipe overall frame and the second replacement part in the second batch of composite cross-section steel pipe overall frame to complete the replacement of the proposed underground road structure; the internal soil of the reinforced concrete closed frame structure of the proposed underground road is excavated to form the space required for underground passage, thereby completing the construction of the underground road structure.

[0008] Preferably, the first batch of pipe curtain tool tubes for jacking include: the first batch of pipe curtain tool tubes are divided into multiple segments along the longitudinal axis of the underground road to be constructed, the multiple segments are connected end to end and run through the entire length of the underground road to be constructed, wherein the cross-section of the first batch of pipe curtain tool tubes is circular, and the internal space of the first batch of pipe curtain tool tubes is used for discharging debris during the jacking construction of the first batch of pipe curtain tools.

[0009] Preferably, pushing in the first batch of pipe-roof composite cross-section steel pipes and replacing the first batch of pipe-roof tool pipes includes: the first batch of pipe-roof composite cross-section steel pipes includes: a first steel component part and a plain concrete part; wherein, the first steel component part includes a first retained part, a first replacement part, and a first demolished part, the interiors of the first retained part, the first replacement part and the first demolished part are welded into a whole, and the contact surfaces between the first retained part, the first replacement part and the first demolished part are connected by a second fastener; the first batch of pipe-roof composite cross-section steel pipes are divided into multiple segments along the longitudinal axis of the proposed underground road, and the multiple segments are connected end to end and run through the entire length of the proposed underground road.

[0010] Preferably, the type of the first pipe-roof combined cross-section steel pipe includes at least one of the following: L-type, I-type, T-type;

[0011] The L-type is set at the connection between the side wall and the top plate, and the side wall and the bottom plate of the cross-section of the structure of the proposed underground road; the A-type is arranged at the top plate and the bottom plate of the cross-section of the structure of the proposed underground road; and the T-type is set at the connection between the middle wall and the top plate, and the middle wall and the bottom plate of the cross-section of the structure of the proposed underground road.

[0012] Preferably, jacking the second batch of pipe curtain tool tubes in the gaps of the first batch of pipe curtain composite cross-section steel tubes includes: cutting the plain concrete portions of the first batch of pipe curtain composite cross-section steel tubes during the jacking construction of the second batch of pipe curtain tool tubes; wherein the second batch of pipe curtain tool tubes are divided into a plurality of segments along the longitudinal axis of the proposed underground road, the plurality of segments being connected end to end and running through the entire length of the proposed underground road, wherein the cross-section of the second batch of pipe curtain tool tubes is circular, and the internal space of the second batch of pipe curtain tool tubes is used for discharging debris during the jacking construction of the second batch of pipe curtain tool tubes.

[0013] Preferably, pushing in the second batch of pipe-curtain combined cross-section steel pipes and replacing the second batch of pipe-curtain tool pipes includes: the second batch of pipe-curtain combined cross-section steel pipes includes a second steel component part, wherein the second steel component part includes: a second retained part, a second replacement part and a second demolished part, the interiors of the second retained part, the second replacement part and the second demolished part are welded into a whole, and the contact surfaces between the second retained part, the second replacement part and the second demolished part are connected by a third fastener; the second batch of pipe-curtain combined cross-section steel pipes are divided into multiple segments along the longitudinal axis of the proposed underground road, and the multiple segments are connected end to end and run through the entire passage of the proposed underground road; the first batch of pipe-curtain combined cross-section steel pipes and the second batch of pipe-curtain combined cross-section steel pipes are structurally engaged with each other to form a closed combined cross-section steel pipe overall frame.

[0014] Preferably, the adjacent parts of the first batch of pipe-curtain composite cross-section steel pipes and the adjacent second batch of pipe-curtain composite cross-section steel pipes are fixed by first fasteners to form an overall frame of composite cross-section steel pipes, which includes: recombining the first batch of pipe-curtain composite cross-section steel pipes and the second batch of pipe-curtain composite cross-section steel pipes by dismantling and connecting through the following steps: connecting the first replacement part and the second replacement part of the first batch of pipe-curtain composite cross-section steel pipes and the second batch of pipe-curtain composite cross-section steel pipes into a whole; removing the second fasteners between the following components: between the first retained part and the first replacement part; between the first replacement part and the first removed part; removing the third fasteners between the following components: between the second retained part and the second replacement part; between the second replacement part and the second removed part; the first replacement part and the second replacement part are fixed by the first fasteners; wherein, the first replacement part and the first retained part are separated, and the first replacement part and the first removed part are separated; the second replacement part and the second retained part are separated, and the second replacement part and the second removed part are separated.

[0015] Preferably, after the reinforced concrete closed frame structure of the proposed underground road is pushed forward as a whole, the first replacement part in the first batch of pipe-roof composite cross-section steel pipe integral frames and the second replacement part in the second batch of pipe-roof composite cross-section steel pipe integral frames are replaced, and the structural replacement of the proposed underground road is completed, it also includes: excavating the interior of the reinforced concrete closed frame structure of the proposed underground road after the overall pushing into place, and dismantling the first demolition part and the second demolition part.

[0016] Preferably, it also includes: pouring self-compacting concrete to fill the gaps inside the first retained part and the second retained part; constructing an armpit structure, wherein the armpit structure is located at the following positions of the reinforced concrete closed frame main structure: between the side wall and the top plate, between the side wall and the bottom plate, between the middle wall and the top plate, and between the middle wall and the bottom plate.

[0017] The present invention provides an underground road structure construction method, comprising: arranging pipe curtain tool pipes at the center line position of the cross-sectional structure of the proposed underground road; jacking a first batch of pipe curtain tool pipes along the longitudinal axis of the proposed underground road, wherein the first batch of pipe curtain tool pipes are arranged at intervals and constructed by a skip-hole jacking method; jacking a first batch of pipe curtain combined cross-section steel pipes along the longitudinal axis of the proposed underground road to replace the first batch of pipe curtain tool pipes, wherein the outer diameters of the first batch of pipe curtain combined cross-section steel pipes are equal to the outer diameters of the first batch of pipe curtain tool pipes; jacking a second batch of pipe curtain tool pipes into the gaps between the first batch of combined cross-section steel pipes; jacking a second batch of pipe curtain combined cross-section steel pipes to replace the second batch of pipe curtain tool pipes, wherein the outer diameters of the second batch of pipe curtain combined cross-section steel pipes are equal to the outer diameters of the second batch of pipe curtain tool pipes, and the first batch of pipe curtain combined cross-section steel pipes and the second batch of pipe curtain tool pipes are equal to the outer diameters of the second batch of pipe curtain tool pipes. A batch of pipe-curtain composite cross-section steel pipes form a closed curtain; the adjacent parts of the first batch of pipe-curtain composite cross-section steel pipes and the adjacent second batch of pipe-curtain composite cross-section steel pipes are fixed by a first fastener to form a composite cross-section steel pipe overall frame; the reinforced concrete closed frame structure of the proposed underground road is prefabricated; the second fasteners of the first batch of pipe-curtain composite cross-section steel pipes and the third fasteners of the second batch of pipe-curtain composite cross-section steel pipes are removed; the reinforced concrete closed frame structure of the proposed underground road is pushed forward as a whole to replace the first replacement part in the first batch of composite cross-section steel pipe overall frame and the second replacement part in the second batch of composite cross-section steel pipe overall frame to complete the structural replacement of the proposed underground road; the internal soil of the reinforced concrete closed frame structure of the proposed underground road is excavated to form the space required for underground passage, thereby completing the construction of the underground road structure. Through the method in the present application, a horizontal advanced interlocking pipe curtain is constructed along the center line of the cross-sectional structure of the proposed underground road. The steel pipes of the pipe curtain are a composite section of steel-concrete components and steel components. After the steel pipes of the pipe curtain pass through the entire length of the underground road and enclose a closed structure, the prefabricated main structure of the underground road closed frame is pushed in by the overall jacking method to replace a part of the composite section of the advanced pipe curtain steel pipe. After the main structure is in place, soil excavation is carried out to build the underground structure and form a tunnel functional space. This construction method solves the problem in related technologies that underground structure construction in areas with dense existing buildings (structures) is prone to cause settlement and collapse, affecting the normal operation of upper buildings (structures) or road traffic facilities, and improves the safety of underground engineering construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 is a flow chart of an underground structure construction method according to an embodiment of the present invention; Figure 2 is a schematic diagram of jacking a first batch of pipe curtain tool pipes according to an embodiment of the present invention; Figure 3 is a schematic diagram of jacking the first batch of pipe-roof composite cross-section steel pipes according to an embodiment of the present invention; FIG4( a ) is an exploded view of an “L”-shaped steel pipe in the first batch of pipe-roof composite cross-section steel pipes according to an embodiment of the present invention; FIG4( b ) is an exploded view of a “I” type steel pipe in the first batch of pipe-roof composite cross-section steel pipes according to an embodiment of the present invention; FIG4( c ) is an exploded view of a “T”-shaped steel pipe in the first batch of pipe-roof composite cross-section steel pipes according to an embodiment of the present invention; FIG5( a ) is a schematic diagram of the combined connection of “L”-shaped steel pipes in the first batch of pipe-roof composite cross-section steel pipes according to an embodiment of the present invention; FIG5( b ) is a schematic diagram of the combined connection of “I”-shaped steel pipes in the first batch of pipe-roof composite cross-section steel pipes according to an embodiment of the present invention; FIG5( c ) is a schematic diagram of the combined connection of “T”-shaped steel pipes in the first batch of pipe-roof composite cross-section steel pipes according to an embodiment of the present invention; Figure 6 is a schematic diagram of a second batch of pipe curtain tool tubes according to an embodiment of the present invention; Figure 7 is an enlarged schematic diagram of the combined connection of the first batch of pipe-roof composite cross-section steel pipes during the process of jacking the second batch of pipe-roof tool pipes according to an embodiment of the present invention; Figure 8 2. It is a schematic diagram of jacking a second batch of pipe-roof composite cross-section steel pipes and replacing a second batch of pipe-roof tool pipes according to an embodiment of the present invention; Figure 9 1 is an exploded view of a second batch of advanced pipe curtain composite cross-section steel pipes according to an embodiment of the present invention; Figure 10 Schematic diagram of the connection between the interior of the steel components of the first batch of pipe-roof composite cross-section steel pipes and the interior of the steel components of the second batch of pipe-roof composite cross-section steel pipes according to an embodiment of the present invention; Figure 11 is a partially enlarged schematic diagram of the reassembly of the steel components of the first batch of pipe-roof composite cross-section steel pipes and the steel components of the second batch of pipe-roof composite cross-section steel pipes by disengaging and reconnecting according to an embodiment of the present invention; Figure 12 2. It is an overall schematic diagram of a replacement portion of a steel pipe in a pipe-roof composite cross-section replacing a reinforced concrete closed frame main structure according to an embodiment of the present invention; Figure 13 is a partially enlarged schematic diagram of a replacement portion of a steel pipe in a pipe-roof composite cross-section replacing a reinforced concrete closed frame main structure according to an embodiment of the present invention; Figure 14is a schematic diagram of excavating the soil inside the reinforced concrete closed frame structure of an underground road and simultaneously removing the removed portion of the steel pipe in the pipe-roof composite cross-section according to an embodiment of the present invention; Figure 15 is a schematic diagram of filling voids with materials such as self-compacting concrete according to an embodiment of the present invention; Figure 16 Schematic diagram of applying an axillary angle structure according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0020] This embodiment provides a method for constructing an underground structure. Figure 1 Flowchart of the underground structure construction method according to an embodiment of the present invention. Figure 1 As shown, the method includes the following steps S101 to S109.

[0021] Step S101: Arrange pipe curtain tool pipes at the center line of the cross-sectional structure of the planned underground road; jack the first batch of pipe curtain tool pipes 11 along the longitudinal axis of the planned underground road. The first batch of pipe curtain tool pipes 11 are arranged at intervals and constructed using a skip-hole jacking method.

[0022] Step S102 : pushing in the first batch of pipe-roof composite cross-section steel pipes 21 to replace the first batch of pipe-roof tool pipes 11 , wherein the outer diameter of the first batch of pipe-roof composite cross-section steel pipes 21 is equal to the outer diameter of the first batch of pipe-roof tool pipes 11 .

[0023] Step S103 : Pushing the second batch of pipe-roof tool tubes 12 into the gaps between the first batch of pipe-roof composite cross-section steel tubes 21 .

[0024] In step S104, the second batch of pipe-curtain composite cross-section steel tubes 22 are pushed in to replace the second batch of pipe-curtain tool tubes 12. The outer diameter of the second batch of pipe-curtain composite cross-section steel tubes 22 is equal to the outer diameter of the second batch of pipe-curtain tool tubes 12, and the first batch of pipe-curtain composite cross-section steel tubes 21 and the second batch of pipe-curtain composite cross-section steel tubes 22 form a closed curtain.

[0025] In step S105 , the adjacent portions of the first batch of pipe-roof composite cross-section steel pipes 21 and the adjacent second batch of pipe-roof composite cross-section steel pipes 22 are fixed by first fasteners to form an integral composite cross-section steel pipe frame.

[0026] Step S106: prefabricate the reinforced concrete closed frame structure of the planned underground road.

[0027] Step S107 , removing the second fasteners of the first batch of pipe-roof composite cross-section steel pipes 21 and the third fasteners 43 of the second batch of pipe-roof composite cross-section steel pipes 22 .

[0028] In step S108, the reinforced concrete closed frame structure 51 of the proposed underground road is pushed forward as a whole, replacing the first replacement part 212 in the overall frame of the first batch of composite cross-section steel pipes 21 and the second replacement part 222 in the overall frame of the second batch of composite cross-section steel pipes 22, thereby completing the replacement of the proposed underground road structure.

[0029] Step S109: excavate the soil inside the reinforced concrete closed frame structure of the planned underground road to form the space required for underground passage, thereby completing the construction of the underground road structure.

[0030] Through this embodiment, a horizontal advanced interlocking pipe curtain is constructed along the center line of the cross-sectional structure of the proposed underground road. The steel pipes of the pipe curtain are a composite section of steel-concrete components and steel components. After the pipe curtain steel pipes run through the entire length of the underground road and enclose a closed structure, the prefabricated underground road closed frame main structure is pushed in by the overall jacking method to replace a part of the composite section of the advanced pipe curtain steel pipes. After the main structure is in place, soil excavation is carried out to build the underground structure and form a tunnel functional space. This construction method solves the problem in related technologies that underground structure construction in areas with dense existing buildings (structures) is prone to cause settlement and collapse, affecting the normal operation of upper buildings (structures) or road traffic facilities, thereby improving the safety of underground engineering construction.

[0031] During implementation, the first batch of pipe roof tool pipes 11 in step S101 can be pushed in as follows:

[0032] The first batch of pipe curtain tool tubes 11 are divided into multiple segments along the longitudinal axis of the proposed underground road. These segments are connected end-to-end and extend throughout the entire length of the proposed underground road. The first batch of pipe curtain tool tubes 11 have a circular cross-section. The interior space of the first batch of pipe curtain tool tubes 11 is used to remove debris during the jacking operation of the first batch of pipe curtain tools. In this embodiment, the first batch of pipe curtain tool tubes are jacked, and the first batch of pipe curtain tool tubes are connected end-to-end.

[0033] As a preferred embodiment, step S102 can be implemented in the following manner:

[0034] The first batch of pipe-roof composite cross-section steel pipes 21 includes: a first steel component portion and a plain concrete portion 31. Preferably, the plain concrete portion 31 and the first steel component portion are connected using a material that can be cut by the pipe jacking machine tool, such as fiberglass reinforcement. The first steel component portion includes a first retained portion 211, a first replacement portion 212, and a first removed portion 213. The interiors of the first retained portion 211, the first replacement portion 212, and the first removed portion 213 are welded together into a single piece. The contact surfaces between the first retained portion 211, the first replacement portion 212, and the first removed portion 213 are connected by second fasteners 41.

[0035] The first batch of pipe-roof composite cross-section steel pipes 21 are divided into multiple segments along the longitudinal axis of the planned underground road. The multiple segments are connected end to end and run through the entire length of the planned underground road.

[0036] This preferred embodiment achieves the jacking of the first batch of pipe-roof composite cross-section steel pipes. The first batch of pipe-roof composite cross-section steel pipes 21 comprises a first steel component portion and plain concrete. The first steel component portion is then divided into a first retained portion, a first replacement portion, and a first demolished portion, which are subsequently formed into an overall framework.

[0037] Preferably, the first pipe curtain composite cross-section steel pipes include at least one of the following types: L-shaped, I-shaped, and T-shaped (see Figures 4 and 5 for details). For example, the L-shaped pipes are installed at the connection locations between the side walls and the top plate, and between the side walls and the bottom plate of the cross section of the proposed underground road structure; the I-shaped pipes are installed at the connection locations between the top plate and the bottom plate of the cross section of the proposed underground road structure; and the T-shaped pipes are installed at the connection locations between the middle wall and the top plate, and between the middle wall and the bottom plate of the cross section of the proposed underground road structure.

[0038] Through this preferred embodiment, multiple types of combined cross-section steel pipes of the first pipe curtain are realized. The three different types can realize the adjacent interlocking laying of the cross-section steel pipes in the subsequent process, which has better water-stopping performance, is beneficial to improving the working environment during jacking construction, and is also beneficial to controlling soil erosion in the surrounding strata, and reducing the risk of excessive settlement or deformation of surrounding environmental risk sources during construction.

[0039] In practice, step S103 may be performed in the following manner:

[0040] During the jacking construction of the second batch of pipe-roof tool pipes 12, the plain concrete portion 31 of the first batch of pipe-roof composite cross-section steel pipes 21 is cut;

[0041] Among them, the second batch of pipe curtain tool tubes 12 are divided into multiple segments along the longitudinal axis of the planned underground road. The multiple segments are connected end to end and run through the entire length of the planned underground road. Among them, the cross-section of the second batch of pipe curtain tool tubes 12 is circular, and the internal space of the second batch of pipe curtain tool tubes 12 is used to discharge debris during the jacking construction of the second batch of pipe curtain tool tubes 12.

[0042] As a preferred implementation, step S104 can be implemented in the following manner:

[0043] The second batch of pipe-roof composite cross-section steel pipes 22 include a second steel component portion, such as Figure 9 As shown, the second steel component portion includes: a second retained portion 221, a second replacement portion 222, and a second removed portion 223. The interiors of the second retained portion 221, the second replacement portion 222, and the second removed portion 223 are welded together as a whole, and the contact surfaces between the second retained portion 221, the second replacement portion 222, and the second removed portion 223 are connected by a third fastener 43 (as shown in FIG. Figure 10 shown).

[0044] The second batch of pipe-roof composite cross-section steel pipes 22 are divided into multiple segments along the longitudinal axis of the planned underground road. The multiple segments are connected end to end and run through the entire length of the planned underground road.

[0045] The first batch of pipe-curtain combined cross-section steel pipes 21 and the second batch of pipe-curtain combined cross-section steel pipes 22 are structurally engaged with each other to form a closed curtain.

[0046] In practice, step S105 may be performed in the following manner:

[0047] The adjacent portions of the first batch of pipe-roof composite cross-section steel pipes 21 and the adjacent second batch of pipe-roof composite cross-section steel pipes 22 are fixed by first fasteners 42 (e.g. Figure 11 As shown), the overall frame of the combined cross-section steel pipe includes:

[0048] The first batch of pipe-roof composite cross-section steel pipes 21 and the second batch of pipe-roof composite cross-section steel pipes 22 are dismantled and reassembled by connecting them together in the following steps, and the first replacement parts 212 and the second replacement parts 222 of the first batch of pipe-roof composite cross-section steel pipes 21 and the second batch of pipe-roof composite cross-section steel pipes 22 are connected into a whole. (See Figure 10 and Figure 11 )

[0049] Remove the second fastener 41 between the following components: between the first remaining portion 211 and the first replacement portion 212; between the first replacement portion 212 and the first removed portion 21;

[0050] Remove the third fastener 43 between the following components: between the second remaining portion 221 and the second replacement portion 222; between the second replacement portion 222 and the second removed portion 223;

[0051] The first replacement part 212 and the second replacement part 222 are fixed by a first fastener 42;

[0052] The first replacement part 212 is separated from the first remaining part 211 , and the first replacement part 212 is separated from the first demolished part 213 ; the second replacement part 222 is separated from the second remaining part 221 , and the second replacement part 222 is separated from the second demolished part 221 .

[0053] Through this preferred embodiment, the adjacent parts of the first batch of pipe curtain combined cross-section steel pipes 21 and the adjacent second batch of pipe curtain combined cross-section steel pipes 22 are fixed by the first fasteners 42 to form an overall frame of combined cross-section steel pipes, which has better water-stopping performance, is conducive to improving the working environment during jacking construction, and is also conducive to controlling soil erosion in the surrounding strata, and reducing the risk of excessive settlement or deformation of surrounding environmental risk sources during construction.

[0054] In practice, step S108 can be performed as follows: after the reinforced concrete closed frame structure of the proposed underground road is entirely jacked up, replacing the first replacement portion of the first batch of pipe-roof composite cross-section steel pipes 21 integral frame and the second replacement portion of the second batch of pipe-roof composite cross-section steel pipe integral frame, and completing the structural replacement of the proposed underground road, the method further includes: removing the first removal portion 21 and the second removal portion 223. This preferred embodiment further improves the implementation of the composite cross-section steel pipe integral frame by removing the removal portion.

[0055] The construction process of the underground structure may also include: pouring self-compacting concrete 32 to fill the gaps inside the first remaining part 211 and the second remaining part 221; constructing the armpit structure 52 (see Figure 16 ), wherein the armpit structure 52 can be located at the following positions of the reinforced concrete closed frame main structure: between the side wall and the top plate, between the side wall and the bottom plate, between the middle wall and the top plate, and between the middle wall and the bottom plate. This preferred embodiment can further ensure the waterproof quality of the underground road structure.

[0056] This embodiment provides a method for constructing an underground road structure. The method may include: constructing an interlocking pipe curtain along the centerline of the cross-sectional structure of the proposed underground road. The pipe curtain steel pipes (the first batch of pipe curtain combined steel pipes and the second batch of pipe curtain combined steel pipes) are steel-concrete components and steel component combined sections. The pipe curtain steel pipes run through the entire length of the underground road and enclose a closed structure. The prefabricated underground road closed frame main structure is pushed in using an integral jacking method to replace a portion of the combined sections of the first and second batches of pipe curtain steel pipes. After the main structure is in place, soil excavation is carried out to construct the underground structure and form a tunnel functional space.

[0057] For better explanation, the specific implementation steps are described in detail below.

[0058] Step 1: Preparation and construction of the working well.

[0059] The main tasks in this step include construction site preparation, material and equipment preparation, surveying and setting out, and construction of the working pit structure. The working pit is located at both ends of the section where the proposed underground road passes through the existing building (structure), with one end being the starting end and the other end being the receiving end.

[0060] Step 2: Push in the first batch of horizontal advance pipe curtain tool pipes.

[0061] In this step, the pipe curtain tool pipes are constructed in two batches using the jacking method. The first batch of pipe curtain tool pipes 11 are arranged at intervals, that is, the first batch of pipe curtain tool pipes 11 are installed in the stratum using the jump hole jacking method. Figure 2 As shown, the tool tubes are circular steel tubes. Their internal space can be used to remove debris during jacking construction. Grouting and other ground reinforcement operations can be performed as needed within the first batch of pipe curtain tool tubes 11. The first batch of pipe curtain tool tubes 11 are manufactured longitudinally in several segments, each connected end to end, with their total length running the entire length of the proposed underground road structure.

[0062] Step 3: Push in the first batch of pipe-roof composite section steel pipes 21 and replace the first batch of pipe-roof tool steel pipes 11. Figure 3 shown.

[0063] In this step, the first batch of pipe-roof composite cross-section steel pipes 21 are composite cross-section components with the same outer diameter as the first batch of pipe-roof tool steel pipes 11, as shown in Figures 4(a)(b)(c) and Figures 5(a), (b)(c).

[0064] The first batch of pipe-roof composite cross-section steel pipes 21 are composed of a steel component part and a plain concrete part 31. The plain concrete part 31 and the steel component part of the composite cross-section steel pipe 21 are connected by materials and structures that can be cut by the pipe jacking machine tool (such as glass fiber reinforcement, etc.).

[0065] The steel components of the first batch of pipe-roof composite cross-section steel pipes 21 consist of a first retained portion 211, a first replacement portion 212, and a first removed portion 213. The three portions are welded together using steel plates, and the contact surfaces between the three portions are connected using bolts (second fasteners 41).

[0066] The first batch of pipe-roof composite cross-section steel pipes 21 are divided into three types according to their location. The "L" type is suitable for the connection between the side walls and the top and bottom plates of the proposed underground road cross section, as shown in Figures 4(a) and 5(a); the "I" type is suitable for the top and bottom plates, as shown in Figures 4(b) and 5(b); and the "T" type is suitable for the connection between the middle wall and the top and bottom plates, as shown in Figures 4(c) and 5(c).

[0067] Figures 4 and 5 only show one example of "L"-shaped, "I"-shaped, and "T"-shaped combined cross-section steel pipes. Depending on the specific locations of the top plate, bottom plate, side wall, and middle wall, those skilled in the art can arrange them in a mirrored or rotated manner according to actual construction needs.

[0068] The first batch of pipe-roof composite cross-section steel pipes 21 are divided into several segments along the longitudinal direction, and the segments are connected end to end. The total length of the segments runs through the entire length of the planned underground road structure.

[0069] Step 4: Push in the second batch of pipe-roof tool steel pipes 12, as shown in the following example: Figure 6 、 Figure 7 shown.

[0070] A second batch of pipe-roof tool tubes 12 are laid between the first batch of composite-section steel tubes 21. During the jacking process, the plain concrete portion 31 of the first batch of pipe-roof composite-section tubes 21 is removed. The tool tubes can be circular-section steel tubes, and their internal space can be used to remove excavated material during jacking. Grouting and other ground reinforcement operations can also be performed from within the tool tubes as needed. The tool tubes are manufactured longitudinally in several segments, connected end-to-end, with their total length running the entire length of the proposed underground roadway structure.

[0071] Step 5: Push in the second batch of pipe-roof composite section pipes 22 and replace the second batch of pipe-roof tool steel pipes 12. Figure 8 shown.

[0072] The second batch of pipe-roof composite cross-section steel pipes 22 are composite cross-section components with the same outer diameter as the second batch of pipe-roof tool pipes 12. Figure 9 、 Figure 10 shown.

[0073] The second batch of pipe-roof composite cross-section steel pipes 22 are assembled from second steel components.

[0074] The second steel component assembly of the second batch of combined cross-section steel pipes 22 consists of three parts: the second retained part 221, the second replacement part 222 and the second removed part 223. The three parts are welded into a whole by steel plates, and the contact surfaces between the three parts are connected by third fasteners 43 (such as Figure 10 shown).

[0075] The second batch of pipe-roof composite cross-section steel pipes 22 are divided into several segments along the longitudinal direction, and the segments are connected end to end. The total length of the segments runs through the entire length of the planned underground road structure.

[0076] The second batch of composite cross-section steel pipes 22 and the first batch of composite cross-section steel pipes 21 are in a mutually interlocking relationship, forming a closed curtain in the stratum to be excavated.

[0077] Step 6, remove the connecting bolts (second fasteners 41) between the retained portion (first retained portion 211) and the replacement portion (first replacement portion 212), and between the replacement portion (first replacement portion 212) and the removed portion (first removed portion 213) of the first batch of pipe-curtain composite cross-section steel pipes 21, and the connecting bolts (third fasteners 43) between the retained portion (second retained portion 221) and the replacement portion (second replacement portion 222), and between the replacement portion (second replacement portion 222) and the removed portion (second removed portion 223) of the second batch of pipe-curtain composite cross-section steel pipes 22. The replacement portion of the first batch of pipe-curtain composite cross-section steel pipes 21 and the adjacent replacement portion of the second batch of pipe-curtain composite cross-section steel pipes 22 are connected by bolts (first fasteners 42). The steel components of the first batch of cross-section steel pipes and the second batch of cross-section steel pipes are recombined by releasing and reconnecting, so that the replacement portion of each composite cross-section steel pipe is connected as a whole, and the replacement portion is separated from the retained portion and the removed portion. Figure 11 shown.

[0078] Step 7: Prefabricate the underground road reinforced concrete closed frame structure 51 to achieve the designed strength, and at the same time carry out preparation work such as slide plate, back, jacking equipment and measurement.

[0079] Step 8: From the starting working pit, the prefabricated reinforced concrete closed frame structure 51 is pushed in as a whole. At the same time, the replacement parts 212 and 222 of the advanced pipe-roof composite cross-section steel pipes 21 and 22 are pulled in the receiving working pit. The steel components exposed in the receiving working pit are cut in sections to replace the replacement parts 212 and 222 of the pipe-roof composite cross-section steel pipes 21 and 22 with the reinforced concrete closed frame main structure 51. Figure 12 、 Figure 13 shown.

[0080] Step 9: After the underground road reinforced concrete closed frame structure 51 is pushed into place, the soil 6 inside is excavated and the demolished parts 213 and 223 of the advanced pipe curtain composite cross-section steel pipes 21 and 22 are removed. Figure 14 shown.

[0081] Step 10: Use self-compacting concrete or other materials to fill the gaps 32 of the remaining parts 211 and 221 of the first batch of pipe-roof composite cross-section steel pipes 21 and the second batch of pipe-roof composite cross-section steel pipes 22. Figure 15 shown.

[0082] Step 11, construct the underground road reinforced concrete closed frame main structure between the side wall and the top and bottom plates, between the middle wall and the top and bottom plates, as well as the roadbed pavement, roadside curbs, drainage, and other ancillary facilities, such as Figure 16 shown.

[0083] Through this embodiment and its preferred implementation, a method for constructing an underground road structure is provided, which can achieve the following technical effects:

[0084] (1) The pipe-roof steel pipe adopts innovative steel-concrete components and steel component combined sections, which can meet the needs of different construction stages. Its cross section has high flexibility and applicability.

[0085] (2) The pipe curtain is laid using steel pipes, which has a larger operating space, making the disconnection and reconnection of the various parts of its combined cross-section more operable in construction.

[0086] (3) The pipe curtain is laid using steel pipes, which have greater structural rigidity and stronger support capabilities, and can achieve more reliable advanced stratum reinforcement and protection effects. While improving its own support capabilities, grouting and other stratum reinforcement operations can be carried out from inside the steel pipes to further enhance stratum stability and environmental risk source protection.

[0087] (4) The pipe curtain is installed in batches according to the skip hole sequence. The process is mature and reliable, which can effectively reduce the overall disturbance to the surrounding strata and the construction risk is controllable.

[0088] (5) The adjacent steel pipes of the advanced pipe curtain are laid in an adjacent interlocking manner, which has better water-stopping performance and is conducive to improving the working environment during jacking construction. It is also conducive to controlling soil erosion in the surrounding strata and reducing the risk of excessive settlement or deformation of the surrounding environmental risk sources during construction.

[0089] (6) After the overall closed frame structure is jacked into place, the internal gaps of the advanced pipe curtain steel pipes are filled with self-compacting concrete, which can further ensure the waterproof quality of the underground road structure.

[0090] (7) The overall construction plan is carried out in the order of first constructing the pipe curtain, then pushing the closed frame structure into place as a whole, and finally excavating the earth. This ensures that the main structure of the underground road is excavated before the earth. This fundamentally avoids the risk of face stability caused by the existing traditional construction plan of excavating the earth first and then constructing the structure, and the risk of collapse and subsidence of the upper road or adjacent buildings (structures) that cannot be interrupted by traffic being crossed, thereby greatly improving construction safety.

[0091] (8) Since the reinforced concrete closed frame structure is pushed inside the steel pipe of the advanced pipe curtain composite section, a part of the steel pipe composite section is "replaced" during the pushing, and the outer contour of the structure is not in direct contact with the surrounding stratum soil. While reducing the overall pushing friction resistance, it isolates the disturbance of the surrounding stratum during the pushing construction of the closed frame structure, thereby ensuring the normal use of the upper road, adjacent buildings (structures) or underground pipelines, and realizing low-disturbance construction.

[0092] (9) Since the layout of the advanced pipe curtain steel pipes does not need to occupy the space outside the main structure of the underground road, the underground space can be used efficiently as a limited resource, especially when the new underground road and the existing transportation infrastructure need to be arranged close to each other in the vertical direction.

[0093] (10) As the advanced pipe curtain adopts a combined cross-section structure, some of the steel components are replaced by the overall jacking closed frame structure or are removed during the internal soil excavation, which enables the steel to be recycled and reused.

[0094] The present invention relates to the technical field of underground engineering construction, and specifically to a construction method in which, when using a concealed excavation method to pass under an existing road or other building (structure), a horizontal advance pipe curtain is first constructed in the stratum, the steel pipe of the pipe curtain being a composite cross-section of a steel-concrete member and a steel member, and then a portion of the advance pipe curtain steel pipe is replaced by an overall jacking method of a prefabricated reinforced concrete closed frame structure, and finally the soil is excavated to construct an underground structure and form a functional space. Specifically, a horizontal advance interlocking pipe curtain is constructed along the center line of the cross-sectional structure of the proposed underground road, the steel pipe of the pipe curtain being a composite cross-section of a steel-concrete member and a steel member, the steel pipe of the pipe curtain passes through the entire length of the underground road, and after enclosing it into a closed structure, the main structure of the prefabricated underground road closed frame is pushed in by an overall jacking method to replace a portion of the composite cross-section of the advance pipe curtain steel pipe, and after the main structure is in place, the soil is excavated to construct the underground structure and form a tunnel functional space.

[0095] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for constructing an underground structure, characterized in that: include: Arrange pipe curtain tool pipes at the center line of the cross-sectional structure of the proposed underground road; jack the first batch of pipe curtain tool pipes along the longitudinal axis of the proposed underground road, wherein the first batch of pipe curtain tool pipes are arranged at intervals and constructed using a skip-hole jacking method; Pushing in a first batch of pipe-roof composite cross-section steel pipes to replace the first batch of pipe-roof tool pipes, wherein the outer diameter of the first batch of pipe-roof composite cross-section steel pipes is equal to the outer diameter of the first batch of pipe-roof tool pipes; Pushing the second batch of pipe-roof tool pipes into the gaps between the first batch of pipe-roof composite cross-section steel pipes; jacking in a second batch of pipe-curtain composite cross-section steel pipes to replace the second batch of pipe-curtain tool pipes, wherein the outer diameters of the second batch of pipe-curtain composite cross-section steel pipes are equal to the outer diameters of the second batch of pipe-curtain tool pipes, and the first batch of pipe-curtain composite cross-section steel pipes and the second batch of pipe-curtain composite cross-section steel pipes form a closed curtain; The adjacent portions of the first batch of pipe-roof composite cross-section steel pipes and the adjacent second batch of pipe-roof composite cross-section steel pipes are fixed by first fasteners to form an integral frame of composite cross-section steel pipes; Prefabricate the reinforced concrete closed frame structure of the proposed underground road; Remove the second fasteners of the first batch of pipe-roof composite cross-section steel pipes and the third fasteners of the second batch of pipe-roof composite cross-section steel pipes; The reinforced concrete closed frame structure of the proposed underground road is integrally jacked in, replacing the first replacement portion in the first batch of composite cross-section steel tube integral frames and the second replacement portion in the second batch of composite cross-section steel tube integral frames, thereby completing the replacement of the proposed underground road structure; Excavate the soil inside the reinforced concrete closed frame structure of the proposed underground road to form the space required for underground passage, and complete the construction of the underground road structure.

2. The method according to claim 1, characterized in that The first batch of pipe roof tool pipes for jacking include: The first batch of pipe curtain tool tubes are divided into multiple segments along the longitudinal axis of the planned underground road. The multiple segments are connected end to end and run through the entire length of the planned underground road. The cross-section of the first batch of pipe curtain tool tubes is circular, and the internal space of the first batch of pipe curtain tool tubes is used to discharge debris during the jacking construction of the first batch of pipe curtain tools.

3. The method according to claim 1, characterized in that The first batch of pipe-roof composite cross-section steel pipes are pushed in, and the replacement of the first batch of pipe-roof tool pipes includes: The first batch of pipe-roof composite cross-section steel pipes includes: a first steel component part and a plain concrete part; The first steel component comprises a first retained portion, a first replacement portion, and a first removed portion, wherein the interiors of the first retained portion, the first replacement portion, and the first removed portion are welded together, and the contact surfaces between the first retained portion, the first replacement portion, and the first removed portion are connected by a second fastener; The first batch of pipe-roof composite cross-section steel pipes are divided into multiple segments along the longitudinal axis of the planned underground road. The multiple segments are connected end to end and run through the entire length of the planned underground road.

4. The method according to claim 3, characterized in that The type of the first pipe-roof composite cross-section steel pipe includes at least one of the following: L-type, I-type, T-type; The L-type is set at the connection between the side wall and the top plate, and the side wall and the bottom plate of the cross section of the proposed underground road structure; the A-type is arranged at the top plate and the bottom plate of the cross section of the proposed underground road structure; and the T-type is set at the connection between the middle wall and the top plate, and the middle wall and the bottom plate of the cross section of the proposed underground road.

5. The method according to claim 1, characterized in that: The second batch of pipe-roof tool pipes are pushed into the gaps between the first batch of pipe-roof composite cross-section steel pipes, including: During the jacking construction of the second batch of pipe-roof tool pipes, cutting the plain concrete portion of the first batch of pipe-roof composite cross-section steel pipes; The second batch of pipe curtain tool tubes are divided into multiple segments along the longitudinal axis of the planned underground road, and the multiple segments are connected end to end and run through the entire length of the planned underground road. The cross-section of the second batch of pipe curtain tool tubes is circular, and the internal space of the second batch of pipe curtain tool tubes is used to discharge debris during the jacking construction of the second batch of pipe curtain tool tubes.

6. The method according to claim 5, characterized in that The second batch of pipe-roof composite section steel pipes are pushed in and the tool pipes for replacing the second batch of pipe-roof tool pipes include: The second batch of pipe-roof composite cross-section steel pipes includes a second steel component portion, wherein the second steel component portion includes: a second retained portion, a second replacement portion, and a second removed portion, wherein the interiors of the second retained portion, the second replacement portion, and the second removed portion are welded together, and contact surfaces between the second retained portion, the second replacement portion, and the second removed portion are connected by a third fastener; The second batch of pipe-roof composite cross-section steel pipes are divided into a plurality of segments along the longitudinal axis of the proposed underground road, and the plurality of segments are connected end to end and run through the entire length of the proposed underground road; The first batch of pipe-curtain combined cross-section steel pipes and the second batch of pipe-curtain combined cross-section steel pipes are structurally engaged with each other to form a closed curtain.

7. The method according to claim 6, characterized in that The adjacent portions of the first batch of pipe-roof composite cross-section steel pipes and the adjacent second batch of pipe-roof composite cross-section steel pipes are fixed by first fasteners to form an overall composite cross-section steel pipe frame, which includes: The first batch of pipe-roof composite cross-section steel pipes and the second batch of pipe-roof composite cross-section steel pipes are reassembled by dismantling and connecting, and the first replacement parts and the second replacement parts of the first batch of pipe-roof composite cross-section steel pipes and the second batch of pipe-roof composite cross-section steel pipes are connected into a whole by the following steps: removing the second fastener between the following components: between the first remaining portion and the first replacement portion; between the first replacement portion and the first removed portion; Removing the third fastener between the following components: between the second remaining portion and the second replacement portion; between the second replacement portion and the second removed portion; The first replacement part and the second replacement part are fixed by the first fastener; The first replacement part is separated from the first retained part, and the first replacement part is separated from the first demolished part; the second replacement part is separated from the second retained part, and the second replacement part is separated from the second demolished part.

8. The method according to claim 6 or 7, characterized in that: After the reinforced concrete closed frame structure of the proposed underground road is integrally jacked in, replacing the first replacement portion of the first batch of pipe-roof combination cross-section steel pipe integral frames and the second replacement portion of the second batch of pipe-roof combination cross-section steel pipe integral frames, and completing the structural replacement of the proposed underground road, the method further includes: The first removal portion and the second removal portion are removed.

9. The method according to claim 6 or 7, characterized in that: Also includes: pouring self-compacting concrete to fill the gaps inside the first remaining part and the second remaining part; An armpit corner structure is constructed, wherein the armpit corner structure is located at the following positions of the reinforced concrete closed frame main structure: between the side wall and the top plate, between the side wall and the bottom plate, between the middle wall and the top plate, and between the middle wall and the bottom plate.

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