CN114108614A

CN114108614A - Construction method for sublevel sinking of underground building composed of connecting piles

Info

Publication number: CN114108614A
Application number: CN202111226314.XA
Authority: CN
Inventors: 王树生
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-10-21
Filing date: 2021-10-21
Publication date: 2022-03-01

Abstract

The invention discloses a construction method for the subsection sinking of an underground building composed of connecting piles, which relates to the technical field of underground building construction, wherein the underground building comprises a plurality of pipe joints, interfaces, connecting piles and construction devices, the pipe joints comprise vertical bosses and pipe bodies positioned on the side parts of two ends, the construction devices comprise pipe joint construction devices and pile construction devices, the interfaces are positioned at the connecting positions of two adjacent pipe bodies and positioned between two transversely arranged connecting piles, the shape of an inner cavity of the cross section of each interface is the same as that of an inner cavity of the cross section of each pipe body, the interfaces are constructed after the adjacent pipe joints and the connecting piles are completed, the connecting piles comprise grooves, and the bosses are embedded with the grooves; the pipe joint construction device comprises an excavating device and a hanging device located at the top of the pipe joint, the excavating device comprises end portion racks located at two ends, chain cutters arranged longitudinally and a driving device installed above the pipe body, each chain cutter comprises a chain and a cutter installed on the chain, and the chain cutters are wrapped on the pipe body through the end portion racks.

Description

Construction method for sublevel sinking of underground building composed of connecting piles

Technical Field

The invention relates to the technical field of underground building construction, in particular to a construction method for the subsection sinking of an underground building consisting of connecting piles.

Background

The existing large-scale underground building is constructed by an open cut method, the open cut method needs to firstly open a foundation pit for supporting and lowering water, then the underground building is poured or assembled in the foundation pit, the process is complex, the cost is high, the construction period is long, and the construction method is large for surrounding high-rise buildings.

The existing technical scheme of the integral sinking of the underground building is that the underground building sinks by self weight, the self weight is completely pressed on a chain cutter at the bottom, the chain cutter is easy to break, and the driving power is greatly increased; the inclination is easy to generate during descending, and the deviation is difficult to correct; the descending speed, namely the feed amount, can not be controlled, the sinking speed is in an out-of-control state, and the cutter head is easy to wear.

Disclosure of Invention

The present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a construction method for the segmental sinking of an underground structure consisting of connecting piles, which solves the above-mentioned problems occurring in the background art.

In order to achieve the purpose, the invention provides the following technical scheme: the underground building comprises a plurality of pipe joints, interfaces, connecting piles and construction devices, wherein each pipe joint comprises a boss and a pipe body which are vertically positioned on the side parts of two ends, each construction device comprises a pipe joint construction device and a pile construction device, each interface is positioned at the joint of two adjacent pipe bodies and is positioned between two transversely arranged connecting piles, the shape of an inner cavity of each cross section is the same as that of the inner cavity of the cross section of each pipe body, each interface is constructed after the adjacent pipe joints and the adjacent connecting piles are completed, each connecting pile comprises a groove, and each boss is embedded into each groove; the pipe body comprises a bottom plate positioned at the bottom and a top plate positioned at the top, and the transverse width of the boss is greater than or equal to the width of the pipe body; the pipe joint construction device comprises an excavating device and a hanging device positioned at the top of the pipe joint, the excavating device comprises end part racks positioned at two ends, chain cutters arranged longitudinally and a driving device arranged above the pipe body, each chain cutter comprises a chain and a cutter arranged on the chain, and each chain cutter is wrapped on the pipe body through the end part racks; the pipe joint is manufactured on the ground, the pipe joint including the excavating device is in a suspended state through the hanging device, the driving device is started, the chain cutter at the bottom of the bottom plate excavates rock soil, the excavated rock soil is brought to the upper side by the chain cutter running from bottom to top, sinking operation of the pipe joint is realized, the pipe joint sinks to a set depth, the chain cutter is pulled out, the end part rack is detached, and construction of the joint is completed until all construction of the pipe joint is completed; the construction of the connecting pile is completed by using the pile construction device, and the adjacent two pipe joints which are constructed later are connected into a whole at the side surface through the connecting pile which is constructed earlier in a sinking way.

As a further scheme of the invention: the joints comprise bottom plate joints and top plate joints, and the joints are constructed after the construction of connecting piles and pipe joints is finished; the bottom of the boss comprises an inclined plane, and rock soil in the groove is squeezed to the middle in the process of sinking of the boss through the inclined plane, so that the chain cutter in the excavating device is taken away.

As a further scheme of the invention: the both ends of body include interim breakwater, make the body form the room body, the tube coupling sinks to the degree of depth of setting for, when groundwater equals the dead weight that the tube coupling includes excavating gear to the buoyancy of tube coupling and ground to the tube coupling, is in critical state, through aggravating to the body, makes the tube coupling sink the in-process, is in the suspension state all the time.

As a further scheme of the invention: the water retaining wall at the front end of the previous sinking pipe joint, the end part rack at the rear end of the sinking pipe joint and the two connecting piles form a space to form a soil outlet groove hole when the excavating device excavates soil; the cobblestones under the bottom plate are brought to the unearthed slotted holes, and the cobblestones in the unearthed slotted holes reach a certain degree and are cleaned.

As a further scheme of the invention: the water retaining wall comprises a soil outlet bottom slotted hole, cobbles are brought to the soil outlet slotted hole by the chain cutter, and soil is discharged through the bottom slotted hole.

As a further scheme of the invention: the bottom of the connecting pile comprises a pile bottom inclined plane, the pile construction device comprises a drilling machine, the drilling machine comprises a rack, a drill rod and a drilling tool, the drill rod is positioned in the groove, and the drilling tool at the bottom of the drill rod is positioned at the bottom of the connecting pile; when the connecting pile is sunk for construction, the inclined plane of the pile bottom extrudes the rock soil below the bottom of the connecting pile to the drilling tool, and the drilling machine sends the excavated rock soil at the bottom of the connecting pile to the upper part.

As a further scheme of the invention: the bottom of the pipe body comprises a strip base, the chain knife comprises a strip base chain knife A, and the strip base chain knife A envelopes the pipe body containing the strip base.

As a further scheme of the invention: the chain knife comprises a chain plate, the chain plate is arranged on the chain, and the knife is arranged on the chain plate; the chain cutter comprises a plurality of groups of tapered strip chain cutters, the cutters in the strip chain cutters comprise head cutters positioned at the front ends, middle cutters positioned in the middle and scraping plates positioned at the tail ends, each head cutter comprises a long cutter, each middle cutter comprises two short cutters, the height of each scraping plate is slightly lower than that of the head cutter and the middle cutters, the head cutters and the middle cutters excavate rock soil, and the scraping plates bring the excavated rock soil to the front.

As a further scheme of the invention: the hanging device comprises a steel strand hydraulic lifting jack, the jack adopts a hydraulic lifter with a core-penetrating structure as a lifting machine, wedge-shaped anchors at two ends of the hydraulic lifter have a one-way self-locking function, the steel strand can be automatically locked when the anchors work, the steel strand is released when the anchors do not work, the steel strand can move up and down, the pipe joints sink under a hanging state, and the jacks synchronously and slowly lift.

As a further scheme of the invention: when the chain cutter is used for excavating rock and soil, different geological conditions are met by controlling the descending speed of the hanging device, and when the chain cutter is worn, the chain cutter is replaced at the top.

In summary, the invention has the advantages that the sinking speed is controllable due to the addition of the hanging device, compared with the prior art, the invention has the following advantages: because the chain cutter is in a suspension state, the vertical force of the bottom pressing on the chain cutter is extremely small, so that the stress of the chain cutter is small, and the driving force is sharply reduced; because of multi-point hanging, the synchronous descending is easy to realize, the inclination can not be generated due to the huge dead weight, and the deviation rectification is not needed; because the descending speed is controllable, for different geological conditions, different feed amounts can be designed according to the requirements, namely different descending speeds, the cutter head is not worn, and the service life is greatly prolonged.

Compared with the whole sinking of the building, the invention has large self weight, and the invention reduces the weight of sinking construction of single structural members by splitting the building into pipe joints and connecting piles and conducting sinking construction in sequence, and particularly for underground buildings with large longitudinal length, such as an underground comprehensive pipe gallery, a tunnel, a subway station and the like, the invention has the advantages of line production, simple construction and short period.

Drawings

FIG. 1 is a schematic structural diagram of a building 1 which is an underground comprehensive pipe gallery, connecting piles 1-3 are constructed in place in advance, and a pipe joint construction device 4 is used for sinking one pipe joint 1-1;

fig. 2 is a top view of the building 1;

FIG. 3 is a view A-A of FIG. 2, the gap between the sinking-constructed pipe joint 1-1 and the pipe body 3 is formed by the bottom plate joint 1-2-1 and the top plate joint 1-2-2 of the joint 1-2 through secondary pouring or assembling;

FIG. 4 is a schematic diagram of a mechanism of the pipe joint construction device 4 for sinking the pipe body 3, and is also a schematic diagram of a structure in which an inclined surface 2-1 is provided at the bottom of the boss 2;

FIG. 5 is a schematic structural view showing that the strip bases 3-3 are arranged on the left and right sides of the bottom of the pipe body 3, and the strip base chain knife 7A envelopes the strip bases 3-3;

fig. 6 is a schematic structural view of the pile constructing apparatus 5 for sinking the connecting piles 1-3;

FIG. 7 is a schematic structural diagram of a drilling machine 8 comprising two sets of drill rods 8-2 and drilling tools 8-3, excavating rock soil in the left and right grooves 1-3-1 of the connecting piles 1-3, connecting two inclined planes 1-3-2 at the bottoms of the piles 1-3 to make the bottoms tapered, extruding the middle rock soil into the left and right grooves 1-3-1 in the sinking process, and excavating and conveying the rock soil to the upper side by the drilling tools 8-3;

fig. 8 is a top view of the connection piles 1-3;

FIG. 9 is a schematic view of link plate 7-3 mounted on chain 7-1 and knife 7-2 mounted on link plate 7-3;

fig. 10 is a schematic structural view of the strip-shaped chain cutter 9;

FIG. 1 is a building; 1-1 is a pipe section; 1-2 is an interface; 1-2-1 is a backplane interface; 1-2-2 is a top plate interface; 1-3 are connecting piles; 1-3 are connecting piles; 1-3-2 is a pile bottom inclined plane; 1-4 are construction devices; 2 is a boss; 2-1 is an inclined plane; 3 is a tube body; 3-1 is a bottom plate; 3-2 is a top plate; 3-3 is a bar base; 4 is a pipe joint construction device; 4-1 is a hanging device; 4-2 is a temporary water retaining wall; 4-3 is a unearthed slot; 4-4 is a unearthed bottom slot; 5 is a pile construction device; 6 is an excavating device; 6-1 is an end frame; 6-2 is a driving device; 7 is a chain knife, comprising a chain 7-1 and a knife 7-2 arranged on the chain 7-1; 7-1 is a chain; 7-2 is a knife; 7-3 is a chain plate; 7A is a chain cutter with a base; 8 is a drilling machine; 8-1 is a frame; 8-2 is a drill rod; 8-3 is a drilling tool; 9 is a strip chain cutter; 9-1 is a head knife; 9-1-1 is a long knife; 9-2 is a middle knife; 9-2-1 is a short knife; 9-3 is a scraper; and 10 is a steel strand hydraulic lifting jack.

Detailed Description

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 embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.

Referring to fig. 1 to 10, in the embodiment of the present invention, as shown in fig. 1, a building 1 is an underground comprehensive pipe gallery, and includes a plurality of pipe joints 1-1, joints 1-2, connecting piles 1-3, and construction devices 1-4, the pipe joints 1-1 include bosses 2 and pipe bodies 3 which are located vertically at the side portions of both ends, the construction devices 1-4 include pipe joint construction devices 4 and pile construction devices 5, the joints 1-2 are located at the connecting positions of two adjacent pipe bodies 3 and between the two connecting piles 1-3 which are arranged transversely, the shape of the inner cavity of the cross section of the connecting pile is the same as that of the inner cavity of the cross section of the pipe body 3, the connector 1-2 is constructed after the adjacent pipe joint 1-1 and the connecting pile 1-3 are completed, the connecting pile 1-3 comprises a groove 1-3-1, and the boss 2 is embedded with the groove 1-3-1; the pipe body 3 comprises a bottom plate 3-1 positioned at the bottom and a top plate 3-2 positioned at the top, and the transverse width of the boss 2 is more than or equal to that of the pipe body 3; the pipe joint construction device 4 comprises an excavating device 6 and a hanging device 4-1 positioned at the top of a pipe joint 1-1, the excavating device 6 comprises end part frames 6-1 positioned at two ends, chain cutters 7 arranged longitudinally and a driving device 6-2 arranged above the pipe body 3, the chain cutters 7 comprise chains 7-1 and cutters 7-2 arranged on the chains 7-1, and the chain cutters 7 envelop the pipe body 3 through the end part frames 6-1; the pipe joint 1-1 is manufactured on the ground, the pipe joint 1-1 including the excavating device 6 is in a suspension state through the hanging device 4-1, the driving device 6-2 is started, the chain cutter 7 at the bottom of the bottom plate 3-1 excavates rock soil, the excavated rock soil is brought to the upper side by the chain cutter 7 which runs from bottom to top, the pipe joint 1-1 is sunk to a set depth, the chain cutter 7 is drawn out, the end part rack 6-1 is disassembled, and the construction of the interface 1-2 is completed until the whole construction of the pipe joint 1-1 is completed; the construction of the connecting piles 1-3 is completed by using the pile construction device 5, and the adjacent two pipe joints 1-1 which are constructed later are connected into a whole at the side surface through the connecting pile 1-3 which is constructed first and is constructed later.

It should be noted that the pipe joint 1-1 can be cast in place and can also be an assembly type building; and the pipe section 1-1 can sink in sections in the height direction.

As shown in fig. 3, the interface 1-2 includes a bottom plate interface 1-2-1 and a top plate interface 1-2-2, and the interface 1-2 is constructed after the construction of the connecting pile 1-3 and the pipe joint 1-1 is completed; the bottom of the boss 2 comprises an inclined surface 2-1, and rock soil in the groove 1-3-1 is squeezed to the middle in the sinking process of the boss 2 through the inclined surface 2-1, so that a chain cutter 7 in the excavating device 6 is taken away.

The two ends of the pipe body 3 comprise temporary water retaining walls 4-2, so that the pipe body 3 forms a chamber body, the pipe joint 1-1 sinks to a set depth, when the buoyancy of underground water to the pipe joint 1-1 and the friction of rock and soil to the pipe joint 1-1 are equal to the self weight of the pipe joint 1-1 comprising the excavating device 6, the pipe joint is in a critical state, and the pipe joint 1-1 is always in a suspended state in the sinking process by weighting the pipe body 3, for example, filling water into the pipe body 3; before the pipe joint 1-1 is in a critical state, partial dead weight of the pipe joint 1-1 can be balanced by buoyancy in a water filling mode.

The water retaining wall 4-2 at the front end of the previous sinking pipe joint 1-1, the end part frame 6-1 at the rear end of the sinking pipe joint 1-1 and the two connecting piles 1-3 enclose a space which is a soil outlet slotted hole 4-3 when the excavating device 6 excavates rock soil; the cobblestones under the bottom plate 3-1 are brought to the unearthed slotted hole 4-3, and the cobblestones in the unearthed slotted hole 4-3 reach a certain degree and are cleaned.

The water retaining wall 4-2 comprises a unearthed bottom slotted hole 4-4, cobbles are brought to the unearthed slotted hole 4-3 by the chain cutter 7, and then unearthed through the bottom slotted hole 4-4.

The bottom of the connecting pile 1-3 comprises a pile bottom inclined plane 1-3-2, the pile construction device 5 comprises a drilling machine 8, the drilling machine 8 comprises a rack 8-1, a drilling rod 8-2 and a drilling tool 8-3, the drilling rod 8-2 is positioned in the groove 1-3-1, and the drilling tool 8-3 at the bottom of the drilling rod 8-2 is positioned at the bottom of the connecting pile 1-3; during the sinking construction of the connecting pile 1-3, the pile bottom inclined plane 1-3-2 extrudes the rock soil below the bottom of the connecting pile 1-3 to the drilling tool 8-3, and the drilling machine 8 sends the excavated rock soil at the bottom of the connecting pile 1-3 to the upper part.

The bottom of the pipe body 3 comprises a strip base 3-3, the chain knife 7 comprises a strip base chain knife 7A, and the strip base chain knife 7A envelops the pipe body 3 containing the strip base 3-3.

The chain knife 7 comprises a chain plate 7-3, the chain plate 7-3 is arranged on the chain 7-1, and the knife 7-2 is arranged on the chain plate 7-3; the chain cutter 7 comprises a plurality of groups of conical strip chain cutters 9, cutters 7-2 in the strip chain cutters 9 comprise head cutters 9-1 positioned at the front ends, middle cutters 9-2 positioned in the middle and scraping plates 9-3 positioned at the tail ends, the head cutters 9-1 comprise long cutters 9-1-1, the middle cutters 9-2 comprise two short cutters 9-2-1, the height of the scraping plates 9-3 is slightly lower than that of the head cutters 9-1 and the middle cutters 9-2, the head cutters 9-1 and the middle cutters 9-2 dig rock soil, and the scraping plates 9-3 bring the dug rock soil to the front.

It should be noted that: if the width of each group of chain knives is B, the pitch of the chain is T, n middle knives 9-2 are arranged, the length of the short knife 9-2-1 is a, the length of the long knife 9-1-1 is 2a, B = (2 n + 1) a, and the length of each group of strip chain knives 9 is equal to (n + 2) T, so that the length of the upper knife 7-2 of each chain plate 7-3 is equal.

The hanging device 4-1 comprises a steel strand hydraulic lifting jack 10, the jack 10 adopts a hydraulic lifter with a core-through structure as a lifting machine tool, wedge-shaped anchors at two ends of the hydraulic lifter have a one-way self-locking function, when the anchors work tightly, the steel strand can be automatically locked, when the anchors do not work loose, the steel strand is released, the steel strand can move up and down, the pipe joint 1-1 sinks under a hanging state, and a plurality of jacks 10 synchronously and slowly lift; because the pipe joint 1-1 has huge dead weight, the pipe joint is difficult to deviate, and deviation rectification is not needed.

When the chain cutter 7 excavates rock soil, different geological conditions are met by controlling the descending speed of the hanging device 4-1, and when the cutter 7-2 is worn, the cutter is replaced at the top.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, only for the convenience of description of the present invention and for simplicity of description, rather than to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, the present invention should not be construed as being limited thereto, and it should be noted that the terms "mounted" and "connected" should be interpreted broadly, for example, as being able to be fixedly connected, detachably connected, or integrally formed, mechanically connected or indirectly connected through an intermediate, and the specific meaning of the terms in the invention can be understood through specific situations.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A construction method for the sectional sinking of an underground building consisting of connecting piles is characterized in that the underground building (1) comprises a plurality of pipe sections (1-1), connectors (1-2), connecting piles (1-3) and construction devices (1-4), the pipe sections (1-1) comprise bosses (2) and pipe bodies (3) which are vertically arranged at the side parts of two ends, the construction devices (1-4) comprise pipe section construction devices (4) and pile construction devices (5), the connectors (1-2) are arranged at the connecting positions of two adjacent pipe bodies (3) and between the two transversely arranged connecting piles (1-3), the shape of an inner cavity of the cross section of each connector is the same as that of an inner cavity of the cross section of the pipe body (3), and the connectors (1-2) are constructed after the adjacent pipe sections (1-1) and the connecting piles (1-3) are finished, the connecting pile (1-3) comprises a groove (1-3-1), and the boss (2) is embedded with the groove (1-3-1); the pipe body (3) comprises a bottom plate (3-1) positioned at the bottom and a top plate (3-2) positioned at the top, and the transverse width of the boss (2) is more than or equal to the width of the pipe body (3); the pipe joint construction device (4) comprises an excavating device (6) and a hanging device (4-1) positioned at the top of the pipe joint (1-1), the excavating device (6) comprises end part racks (6-1) positioned at two ends, chain cutters (7) arranged longitudinally and a driving device (6-2) arranged above the pipe body (3), the chain cutters (7) comprise chains (7-1) and cutters (7-2) arranged on the chains (7-1), and the chain cutters (7) envelop the pipe body (3) through the end part racks (6-1); the pipe joint (1-1) is manufactured on the ground, the pipe joint (1-1) including the excavating device (6) is in a suspension state through the hanging device (4-1), the driving device (6-2) is started, the chain cutter (7) at the bottom of the bottom plate (3-1) excavates rock soil, the chain cutter (7) running from bottom to top brings the excavated rock soil to the top, sinking operation of the pipe joint (1-1) is achieved, the pipe joint (1-1) sinks to a set depth, the chain cutter (7) is pulled out, the end part rack (6-1) is detached, construction of the interface (1-2) is completed, and all construction of the pipe joint (1-1) is completed; the construction of the connecting piles (1-3) is completed by using the pile construction device (5), and the adjacent two pipe joints (1-1) which are constructed later are connected into a whole at the side surface through the connecting piles (1-3) which are constructed earlier.

2. The construction method for the segmental sinking of the underground building consisting of the connecting piles as claimed in claim 1, wherein the joints (1-2) comprise a floor joint (1-2-1) and a roof joint (1-2-2), and the joints (1-2) are constructed after the construction of the connecting piles (1-3) and the pipe joints (1-1) is completed; the bottom of the boss (2) comprises an inclined plane (2-1), and rock soil in the groove (1-3-1) is squeezed to the middle in the sinking process of the boss (2) through the inclined plane (2-1), so that a chain cutter (7) in the excavating device (6) is taken away.

3. The construction method for the sublevel sinking of an underground building consisting of connecting piles according to claim 2, wherein both ends of the pipe body (3) include temporary retaining walls (4-2) to make the pipe body (3) form a chamber body, the pipe joints (1-1) are sunk to a set depth, and the pipe joints (1-1) are always in a suspended state by adding weight to the pipe body (3) when buoyancy of groundwater to the pipe joints (1-1) and friction of rock soil to the pipe joints (1-1) are equal to the self weight of the pipe joints (1-1) including the excavating means (6).

4. A construction method for the segmental sinking of an underground building consisting of connecting piles as claimed in claim 3, wherein the retaining wall (4-2) of the front end of the previous completed sinking pipe section (1-1) and the end frame (6-1) of the rear end of the sinking pipe section (1-1) are formed, and the two connecting piles (1-3) enclose a space for the unearthed slot hole (4-3) of the excavating means (6) when excavating the soil; the cobblestones positioned below the bottom plate (3-1) are brought to the unearthed slotted holes (4-3), and the cobblestones in the unearthed slotted holes (4-3) are cleaned on time or according to quantity.

5. The construction method for the sublevel sinking of an underground building consisting of connecting piles as claimed in claim 4, wherein the dam (4-2) comprises a unearthed bottom slot (4-4), and the chain cutter (7) brings the cobbles to the unearthed slot (4-3) and then unearthes through the bottom slot (4-4).

6. The construction method for the sublevel sinking of an underground building composed of connecting piles according to claim 5, wherein the bottoms of the connecting piles (1-3) include pile bottom slopes (1-3-2), the pile construction apparatus (5) includes a drilling machine (8), the drilling machine (8) includes a frame (8-1), a drill rod (8-2) and a drilling tool (8-3), the drill rod (8-2) is located in the groove (1-3-1), the drilling tool (8-3) at the bottom of the drill rod (8-2) is located at the bottom of the connecting pile (1-3); when the connecting pile (1-3) sinks for construction, the pile bottom inclined plane (1-3-2) extrudes the rock soil below the bottom of the connecting pile (1-3) to the drilling tool (8-3), and the drilling machine (8) sends the excavated rock soil at the bottom of the connecting pile (1-3) to the upper part.

7. A construction method for sinking a section of an underground building consisting of connecting piles according to claim 6, wherein the bottom of the tubular body (3) comprises a bar foundation (3-3), the chain cutter (7) comprises a bar foundation chain cutter (7A), and the bar foundation chain cutter (7A) envelops the tubular body (3) containing the bar foundation (3-3).

8. The construction method for the sublevel sinking of an underground building consisting of connecting piles as claimed in claim 7, wherein the chain cutter (7) comprises a link plate (7-3), the link plate (7-3) is installed on the chain (7-1), and the cutter (7-2) is installed on the link plate (7-3); the chain cutter (7) comprises a plurality of groups of conical strip chain cutters (9), the cutters (7-2) in the strip chain cutters (9) comprise head cutters (9-1) located at the front ends, middle cutters (9-2) located in the middles and scraping plates (9-3) located at the tail ends, the head cutters (9-1) comprise long cutters (9-1-1), the middle cutters (9-2) comprise two short cutters (9-2-1), the heights of the scraping plates (9-3) are slightly lower than those of the head cutters (9-1) and the middle cutters (9-2), the head cutters (9-1) and the middle cutters (9-2) dig rock soil, and the scraping plates (9-3) bring the dug rock soil to the front.

9. The construction method for the sectional subsidence of the underground building composed of the connecting piles according to claim 8, wherein the hanging means (4-1) comprises a hydraulic lifting jack (10) for the steel strand, the hydraulic lifting jack (10) adopts a hydraulic lifter with a core-through structure as a lifting machine, wedge-shaped anchors at both ends of the hydraulic lifter have a one-way self-locking function, when the anchors are operated, the steel strand is automatically locked, when the anchors are not operated, the steel strand is released, the steel strand can move up and down, the pipe joint (1-1) is sunk in a hanging state, and a plurality of the jacks (10) are synchronously and slowly lifted.

10. The construction method for the sublevel sinking of an underground building consisting of connecting piles according to claim 9, wherein the chain cutter (7) is used to satisfy different geological conditions by controlling the descending speed of the suspender (4-1) when excavating the soil, and is replaced at the top when the cutter (7-2) is worn.