Multi-head perforating apparatus and method for breaking a diaphragm wall

Abstract

The present application relates to a multi-head punching device for punching a diaphragm wall to break the diaphragm wall, and a method for breaking a diaphragm wall, comprising: a plurality of punching units arranged in one or more columns, at least one column of the one or more columns having two or more punching units, the spacing between adjacent punching units of the two or more punching units being no more than a predetermined spacing, the predetermined spacing being equal to or a multiple of a specific length at which a main reinforcement in the diaphragm wall is expected to be finally cut off; and a driving mechanism, the plurality of punching units being arranged on one side of the driving mechanism, at least one driving device being arranged in the driving mechanism and capable of driving the plurality of punching units to operate. The multi-head punching device can weaken the structural strength of the main reinforcement in the diaphragm wall, and further cut the main reinforcement into a specific length or less.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel construction, in particular, to a multi-head punching device and a method for breaking a underground continuous wall. BACKGROUND

[0002] In the construction of underground space, such as the construction of a subway line, it is often necessary to build underground continuous walls (referred to as continuous walls or diaphragm walls) and various protective pile structures for support and waterproofing. Such structures contain a large amount of steel reinforcement, among which the main reinforcement is usually anti-seismic reinforcement with a diameter of up to 28mm or 32mm, which has superior shear resistance, making the overall structure of the underground continuous wall particularly strong.

[0003] However, these underground continuous walls occupy a large amount of underground space, greatly limiting the further development of underground space. For example, the batch planning of subway lines results in many completed subway stations being converted into transfer stations, but there is no reserved portal for tunneling equipment such as shield machines to cut or dig in the original planning (or not reserved due to cost reasons), so the existing underground continuous wall needs to be broken in the new construction process.

[0004] There are two methods for breaking the underground continuous wall, namely manual breaking and direct grinding by a shield machine.

[0005] When the manual breaking method is used, a vertical shaft is excavated next to the position of the underground continuous wall to be broken and a new underground continuous wall is poured. The new underground continuous wall uses cuttable or excavable materials, such as glass fiber reinforcement, instead of steel reinforcement at the position where the tunneling equipment such as the shield machine needs to pass through, and the rest still uses thick steel reinforcement. The new underground continuous wall itself forms a square well as a clearing well, and the soil inside the well is reinforced and excavated layer by layer, supported layer by layer, until the shield passing area is excavated, and then the surrounding continuous wall is structurally reinforced as necessary. The soil between the old continuous wall and the new continuous wall also needs to be reinforced. Then, the new continuous wall, soil, and old continuous wall reinforced concrete on the side facing the old continuous wall are manually broken by using engineering water drill, rope saw, air pick, etc. Finally, it is backfilled. This method usually takes 3 to 6 months and costs 10 to 20 million yuan.

[0006] When the direct grinding method is adopted, the shield machine cutter head needs to be first modified and the cutter configuration needs to be improved (special cutting knives are installed on the cutter head of the shield machine to cut the steel bars in the underground continuous wall); secondly, even if alloy steel is used to make the cutting knives, it is still impossible to avoid damage to the cutting knives when cutting the steel bars or problems such as entanglement of the steel bars on the cutter head, so it is necessary to open the chamber for manual replacement of the cutting knives and processing of the entangled steel bars. However, when the shield machine is opened, the soil needs to be reinforced and the environment needs to be pressurized (for example, to 3 atmospheres), which means that additional construction costs are faced and the safety risk to the construction personnel is huge under pressure. This method usually takes 1 month and costs more than 5 million yuan.

[0007] Overall, both methods are time-consuming, costly, and may face huge safety risks. Therefore, it is urgent to find a new method to complete the breaking of the underground continuous wall in a faster, lower-cost and safer way. SUMMARY

[0008] The purpose of the present application is to provide a multi-head punching device for punching on an underground continuous wall to break the underground continuous wall and a method for breaking the underground continuous wall by using the multi-head punching device, so that the breaking of the underground continuous wall by the tunneling equipment can be completed in a faster, lower-cost and safer way.

[0009] The applicant found in the research that the main difficulty in breaking the underground continuous wall by the tunneling equipment comes from the long and strong main steel bars in the underground continuous wall. If the structural strength of the main steel bars can be weakened in advance, for example, the main steel bars are partially damaged or even completely cut into a length less than or equal to a certain length to reduce the possibility of entanglement of the steel bars on the cutter head, the efficiency of the tunneling equipment in breaking the underground continuous wall can be greatly improved and the risk of equipment damage can be reduced.

[0010] For example, during the execution of the direct grinding method of the shield machine, the damage to the cutter head mainly comes from the long and strong main steel bars in the underground continuous wall. If the length of the main steel bars is controlled within a certain length, the wear of the cutters on the cutter head can be greatly reduced, the service life of the cutters can be prolonged, and the entanglement of the main steel bars on the cutter head or the blockage of the screw conveyor in the shield machine can be avoided, so that the shield machine can smoothly pass through the underground continuous wall without the need to open the chamber (replace the cutting knives or process the entangled steel bars), and the shield machine will not be damaged to the extent that it cannot work. At the same time, the use of manual chipping method to chip the entire underground continuous wall is also not necessary, so that the construction period, cost and construction safety risk can be greatly reduced.

[0011] In order to weaken the structural strength of the main reinforcement in the underground continuous wall in advance, and preferably also to directly process the main reinforcement into short reinforcement of a specific length or less, the applicant, according to the first aspect of the present application, proposes a multi-head punching device for punching a hole in an underground continuous wall to break the underground continuous wall, comprising: a plurality of punching units arranged in one or more columns, at least one column of the one or more columns having two or more punching units, the spacing between adjacent punching units in the two or more punching units being not greater than a predetermined spacing, the predetermined spacing being equal to or a multiple of a specific length at which the main reinforcement in the underground continuous wall is expected to be finally cut off; and a driving mechanism, the plurality of punching units being arranged on one side of the driving mechanism, at least one driving device being arranged in the driving mechanism, the at least one driving device being capable of driving the plurality of punching units to operate. By setting the predetermined spacing for the punching units in the same column, the main reinforcement in the underground continuous wall can be effectively processed into a specific length or less, or partially cut off at a spacing of a specific length or less, so that it is very easy to break or shear into a specific length or less when cut or excavated by a tunneling device. When the predetermined spacing is substantially equal to the specific length, the main reinforcement can be at least partially cut off to the specific length in one punching operation. When the predetermined spacing is substantially equal to a multiple of the specific length, the main reinforcement can be at least partially cut off to the specific length in multiple punching operations.

[0012] In addition, the multi-head punching device can also damage the concrete structure of the underground continuous wall, making it easier to break the underground continuous wall.

[0013] Preferably, the diameter of the punching unit is greater than or equal to the diameter of the main reinforcement in the continuous wall. In this way, when the punching unit is directly opposite the main reinforcement, the main reinforcement can be guaranteed to be cut off. More preferably, in order to improve the cutting rate, the diameter of the punching unit can be set to be greater than or equal to 100 mm, and relatively, the diameter of the conventional main reinforcement is 28 mm or 32 mm, so that without deliberately aligning the punching unit with the main reinforcement, the cutting of the main reinforcement can be achieved in most cases.

[0014] Preferably, the above-mentioned predetermined spacing can be 300 mm, preferably 250 mm, and more preferably 200 mm.

[0015] Preferably, when the plurality of punching units are arranged in a plurality of columns, each punching unit in adjacent columns is arranged staggered in a vertical direction and overlapped in a horizontal direction, so that in a single punching, the strength of the main reinforcement can be weakened regardless of the arrangement of the main reinforcement. More preferably, the width of the portion in which the plurality of punching units in adjacent columns are overlapped in the horizontal direction is greater than or equal to a predetermined width. The predetermined width can be set in relation to the diameter of the main reinforcement used in the underground continuous wall. For example, the predetermined width can be 28 mm or 32 mm. In this way, in a single punching, the main reinforcement can be cut off to be less than or equal to a certain length regardless of the arrangement of the main reinforcement.

[0016] Preferably, the plurality of punching units can be arranged in a substantially linear, triangular, circular, diamond, or rectangular structure.

[0017] Preferably, the number of the plurality of punching units is greater than or equal to 4, preferably greater than or equal to 10, and more preferably greater than or equal to 50.

[0018] Preferably, the multi-head punching apparatus can further include a support assembly including a first support member, a second support member, and a first displacement mechanism, wherein the first displacement mechanism causes relative linear motion between the first support member and the second support member. The first displacement mechanism can move the first support member relative to the second support member in order to support and fix the multi-head punching apparatus in a work area, facilitating stable and efficient performance of the punching operation.

[0019] Preferably, the support assembly can further include a second displacement mechanism that causes relative linear motion between the first support member and the driving mechanism, alone or in cooperation with the first displacement mechanism.

[0020] Preferably, the first support member is arranged on one side of the driving mechanism where the plurality of punching units are arranged and is connected to the driving mechanism by the second displacement mechanism, and the second support member is arranged on the other side of the driving mechanism and is connected to the driving mechanism by the first displacement mechanism.

[0021] Preferably, the first support member includes a guide end surface on which a plurality of guide through-holes corresponding to the plurality of punching units are arranged, and when the second displacement mechanism causes relative motion between the first support member and the driving mechanism, the plurality of punching units move in the plurality of guide through-holes, respectively, to protrude or retract from the guide end surface.

[0022] Preferably, the first displacement mechanism and the second displacement mechanism can comprise a cylinder and a stroke sensor for measuring the stroke of the cylinder, and the plurality of perforating units can be individually driven or driven in groups according to the measurement data of the stroke sensor.

[0023] Preferably, a wear-resistant sleeve or a wear-resistant coating can be arranged in the guide through hole. The wear-resistant sleeve or the wear-resistant coating can significantly reduce the wear of the perforating unit when it moves in the guide through hole.

[0024] Preferably, the multi-head perforating device can further comprise a hoisting member fixedly connected with the driving mechanism.

[0025] Preferably, the multi-head perforating device can further comprise a bracket for slidably supporting the driving mechanism, the first support component and / or the second support component. The multi-head perforating device can be provided with a hoisting member to be fixedly connected with the bracket.

[0026] Preferably, the driving mechanism is configured as a driving box with a sealing structure to prevent fluid outside the driving mechanism from entering the inside of the driving mechanism.

[0027] According to the second aspect of the present application, the applicant proposes a method for breaking a underground continuous wall, which comprises: performing a trenching step to excavate a working trench on one side of the underground continuous wall, the working trench extending in a vertical direction to a working area of the underground continuous wall; performing a lowering step to lower the multi-head perforating device into the working trench by a hoisting device, the hoisting device being capable of performing lifting and translation operations on the multi-head perforating device; performing a perforating step to perforate the working area to a predetermined depth by the multi-head perforating device; and performing a breaking step to break the underground continuous wall via the working area. In this method, there is no need to build a new continuous wall, and there is no need for personnel to enter the working trench, which is low in safety risk, short in construction period and greatly reduces the cost.

[0028] Preferably, the working area comprises a plurality of working sub-areas, and the method further comprises: performing a lowering step to lower the multi-head perforating device to a first working sub-area in the plurality of working sub-areas by the hoisting device; performing a perforating step to perforate the first working sub-area to a predetermined depth by the multi-head perforating device; performing a displacement step to displace the multi-head perforating device to a next working sub-area in the plurality of working sub-areas by the hoisting device; performing a perforating step to perforate the next working sub-area to a predetermined depth by the multi-head perforating device; and repeating the displacement step and the perforating step until the multi-head perforating device traverses the plurality of working sub-areas.

[0029] Preferably, the plurality of working sub-areas are arranged continuously or overlappingly on the underground continuous wall.

[0030] Preferably, the working area formed by the plurality of working sub-areas covers the tunnel section left after breaking the underground continuous wall.

[0031] Preferably, the hoisting device is provided with a sensor assembly capable of sensing the horizontal position and vertical position of the multi-head drilling device.

[0032] Preferably, the lowering step and / or the shifting step are executed based on the data sensed by the sensor assembly.

[0033] Preferably, before the drilling step, a supporting step is further included, in which a shifting mechanism of the multi-head drilling device supports a supporting part of the multi-head drilling device on a supporting wall in the working slot. In one embodiment, the shifting mechanism can be a first shifting mechanism and a second shifting mechanism, the supporting part can be a first supporting part and a second supporting part, and the supporting wall can be a wall of the underground continuous wall and a slot wall of the working slot opposite to the wall. In another embodiment, the shifting mechanism can be a third shifting mechanism, the supporting part can be a third supporting part, and the supporting wall can be a side wall of the working slot.

[0034] Preferably, after the drilling step, a releasing step is further included, in which the shifting mechanism is driven to move the supporting part away from the supporting wall.

[0035] Preferably, the multi-head drilling device comprises a multi-head drilling device group assembled by a plurality of multi-head drilling devices. By using the multi-head drilling device group assembled by a plurality of multi-head drilling devices, the number of drilling times can be significantly reduced, and the drilling positions can be arranged on the ground, so that the drilling operation is more efficient and accurate.

[0036] Optionally, the multi-head drilling device group comprises a first multi-head drilling device and a second multi-head drilling device, and the shapes and / or sizes of the drilling units of the first multi-head drilling device and the second multi-head drilling device are inconsistent.

[0037] Preferably, the method further comprises a filling step of filling the working slot with a fluid filling. More preferably, the fluid filling comprises mud, and the mud forms a mud protection wall on the slot wall of the working slot. In this way, the strength of the working slot can be enhanced to prevent collapse, and the mud protection wall can also serve as a supporting wall for the multi-head drilling device when it is supported.

[0038] In case the filling step is performed, the method can further comprise performing a backfilling step, backfilling earth material into the working trench and drawing off the fluid filler. This is important when the tunneling machine is crossing the continuous wall and building the tunnel wall.

[0039] Preferably, before the trenching step, soil reinforcement is performed at the trench wall of the working trench. Alternatively or additionally, a reinforced concrete continuous wall or a cuttable concrete continuous wall can also be made at the periphery of the working trench, the thickness of the reinforced concrete continuous wall or the cuttable concrete continuous wall preferably being 600 mm.

[0040] Preferably, the method further comprises performing a hoisting step, hoisting the multi-head perforating device by the hoisting device. The hoisting step can be performed before the backfilling step, for example, when the continuous wall is broken; or the hoisting step can be performed after the breaking step, for example, without performing the backfilling step.

[0041] Preferably, the breaking step comprises crossing the underground continuous wall by a tunneling machine via the working area.

[0042] It should be noted that, unless otherwise specified, other steps can be added between the steps of the above method, and several steps can be performed in parallel.

[0043] The device and method for breaking an underground continuous wall according to the present application can have the following advantages in addition to being able to complete the breaking of the underground continuous wall in a faster, lower-cost and safer manner:

[0044] 1. The structure strength of the main reinforcement can be weakened, and even the vertical main reinforcement can be completely cut off, regardless of the distribution of the vertical main reinforcement in the working area;

[0045] 2. The strength of the concrete structure can be weakened;

[0046] 3. The defects of insufficient spacing of the adjacent perforating units in the same column or insufficient transverse overlap of the adjacent columns of perforating units of the multi-head perforating device can be compensated by reasonably arranging the working sub-areas;

[0047] 4. The perforating units can be controlled individually or in groups;

[0048] 5. The position of the multi-head perforating device, the nearby working conditions and the construction progress can be sensed by sensors;

[0049] 6. The multi-head perforating device can be stably hoisted and accurately positioned. BRIEF DESCRIPTION OF DRAWINGS

[0050] For a better understanding of the above-mentioned and other objects, features, advantages and functions of the present application, reference should be made to the preferred embodiments hereinafter described. The same reference numerals will be used throughout the description and / or drawings to refer to the same or like parts. It is to be understood that the drawings are designed solely for purposes of illustration and not as a definition of the limits of the application, for which reference should be made only to the appended claims. Various components in the drawings are not drawn to scale.

[0051] Figure 1 A schematic view of the multi-head punching device of the present application in a field operation is shown;

[0052] Figure 2a A perspective view of a first embodiment of the multi-head punching device of the present application is shown;

[0053] Figure 2b A perspective view of a second embodiment of the multi-head punching device of the present application is shown;

[0054] Figure 2c A perspective view of a third embodiment of the multi-head punching device of the present application is shown;

[0055] Figures 3a to 3g A schematic view of various arrangements of the plurality of punching units of the multi-head punching device of the present application is shown;

[0056] Figures 4a to 4g A schematic view of various arrangements of the plurality of punching units of the multi-head punching device of the present application is shown; Figures 3a to 3g A schematic view of various arrangements of the plurality of punching units of the multi-head punching device of the present application is shown;

[0057] Figure 5 A flow chart of the process of breaking a diaphragm wall using the multi-head punching device of the present application is shown. DETAILED DESCRIPTION

[0058] Reference will now be made in detail to the preferred embodiments of the present application, examples of which are illustrated in the accompanying drawings. The preferred embodiments described herein are merely exemplary and not limiting, as the present application can be applied to other ways as well, which will be apparent to those skilled in the art.

[0059] Figure 1 A schematic view of the multi-head punching device 100 of the present application in a field operation is shown. The multi-head punching device 100 is lowered into the excavation slot 200 next to the diaphragm wall 500 by the travelling crane mechanism 300 set on the ground 700, for punching holes on the region of the diaphragm wall 500 to be crossed by the shield machine 600, i.e. the working region, so as to allow the shield machine 600 to cross the diaphragm wall 500.

[0060] Here, although the shield machine 600 is taken as an example to cross the underground continuous wall 500, the present application is still applicable in the case where other tunnel boring equipment breaks the underground continuous wall by cutting, digging, etc.

[0061] In Figure 1 The underground space occupied by the underground continuous wall 500 is deeper than the existing underground depth of the subway station 800. On the one hand, this is determined by industry regulations; on the other hand, it reflects the necessity of crossing the underground continuous wall in an efficient and safe manner, and its important significance for the development of underground space.

[0062] Figure 2a A perspective view of the first embodiment of the multi-head perforating device 100 of the present application is shown in detail. The multi-head perforating device 100 includes a plurality of perforating units 110, such as drill bits of a plurality of engineering water drills. The engineering water drill is usually powered by an electric motor, uses a single diamond thin-wall drill bit as a drilling blade, and drills holes in building materials such as concrete, stone, and ceramic tiles, and has a self-contained liquid source. These perforating units 110 can perform a perforating operation on the underground continuous wall 500, which requires the ability to penetrate the underground continuous wall to a certain depth, preferably more than 1 meter, in order to weaken the structural strength of the main reinforcement inside the underground continuous wall, and preferably to cut the main reinforcement to a length less than or equal to a certain length. In order to perforate a large area of the underground continuous wall 500 and increase work efficiency, the number of perforating units can be greater than or equal to 4, preferably greater than or equal to 10, and more preferably greater than or equal to 50.

[0063] Considering that the main reinforcement in the underground continuous wall 500 is mainly vertically arranged, it is necessary to arrange these perforating units 110 into one or more columns, at least one column of which has two or more perforating units, and when the vertical main reinforcement falls into a column with two or more perforating units, the two or more perforating units in the same column can cut the main reinforcement, and the length of the cut main reinforcement is approximately the spacing between adjacent perforating units in the same column.

[0064] Preferably, in order to cut the main reinforcement to less than a certain length with a single perforation, the spacing between adjacent perforating units in the same column can be set to be less than or equal to a predetermined spacing, which can be 300 mm, preferably 250 mm, and more preferably 200 mm.

[0065] However, the choice of the predetermined spacing is not limited to the above-mentioned preferred spacing. The predetermined spacing can be related to the specific length of the reinforcement bar that is desired to be finally cut off, and both can be substantially equal as mentioned above, but also the former can be several times the latter. The effect of the predetermined spacing being equal to the specific length of the reinforcement bar that is desired to be finally cut off can be compensated or replaced by an overlapping arrangement of a plurality of work sub-areas that together form the entire work area. The overlapping arrangement of the work sub-areas helps to ensure that the reinforcement bar is cut off to a length that is less than or equal to the specific length. This is advantageous for some punching units that cannot be densely arranged, as will be explained below with reference to the example of Figure 3f

[0066] Considering that the arrangement of the reinforcement bars within the underground continuous wall 500 is difficult to monitor, it is desirable that the multi-head punching device 100 is able to weaken the structural strength of all the reinforcement bars within the work area or work sub-area in one punching operation, regardless of the arrangement of the reinforcement bars. Thus, a plurality of columns of punching units 110 is provided, and each punching unit 110 in adjacent columns is arranged staggered in the vertical direction and overlapping in the lateral direction. The punching units 110 arranged staggered in the vertical direction and overlapping in the lateral direction ensure that the structure of the reinforcement bars in the vertical direction is at least partially destroyed.

[0067] In particular, in order to achieve that the multi-head punching device 100 is able to cut off all the reinforcement bars within the work area or work sub-area in one punching operation, regardless of the arrangement of the reinforcement bars, the width of the portion in which the punching units 110 in adjacent columns overlap in the lateral direction can be set to be greater than or equal to a predetermined width. The predetermined width is related to the diameter of the reinforcement bars used within the underground continuous wall 500. In common underground continuous walls, the diameter of the reinforcement bars is 28 mm or 32 mm, in which case the predetermined width can be selected accordingly to be 28 mm or 32 mm. Thus, it can be ensured that all the reinforcement bars within the work area or work sub-area are cut off by the punching units.

[0068] However, the punching units 110 in adjacent columns can also not overlap in the lateral direction, in which case the effect of the overlapping arrangement in the lateral direction can be compensated or replaced by an arrangement of a plurality of work sub-areas. The overlapping arrangement of the work sub-areas helps to ensure that all the reinforcement bars are cut off. This is advantageous for some punching units 110 that cannot be densely arranged, as will be explained below with reference to the example of Figure 3g

[0069] Figures 3a to 3g various possible arrangements of the punching units 110 are shown, Figures 4a to 4g corresponding arrangements of all or part of the work sub-areas are shown.

[0070] in Figure 3a ​​In the middle, 10 punching units 110 are arranged in a separate column, forming a linear structure. The diameter D of each punching unit is... a The spacing L between adjacent punching units is 100mm. a It is 300mm.

[0071] In order to ensure that the drilling operation of the multi-head drilling machine 100 covers the entire working area. Figure 4a It shows the relationship with Figure 3a The diagram shows the arrangement of the drilling units 110 and the corresponding work sub-area layout. The linear multi-head drilling device performs drilling operations in work sub-areas A1 to An. The vertical drop between adjacent work sub-areas is 200mm, and the horizontal overlap is greater than 0. Thus, all work sub-areas A1 to An together form a square work area S with a certain side length. a This allows tunnel boring machines with a diameter less than or equal to the stated side length to pass through. Because the working sub-regions have a lateral overlap width, regardless of the arrangement of the main reinforcing bars, holes can be drilled at least partially in the main reinforcing bars to weaken their strength.

[0072] exist Figure 3b In the middle, three punching units 110 are arranged in two columns, forming a triangular structure. The diameter D of each punching unit 110 is... b The horizontal overlap width W between adjacent columns is 200mm. b Greater than 0, the spacing L between adjacent punched units 110 in the same column b It is 250mm.

[0073] In order to ensure that the drilling operation of the multi-head drilling machine 100 covers the entire working area. Figure 4b It shows the relationship with Figure 3b The diagram shows the arrangement of the drilling units 110 and the corresponding work sub-area layout. The triangular multi-head drilling device 100 performs drilling operations in work sub-areas B1 to Bn, which are arranged in an alternating pattern. In some work sub-areas, such as B2 and B4, the multi-head drilling device 100 needs to be rotated 180 degrees for operation. Thus, all work sub-areas B1 to Bn together form a work area S of suitable size. b This allows tunnel boring machines of the corresponding diameter to pass through. Because adjacent columns of the perforation unit have a lateral overlap, holes can be drilled in the main reinforcing bars at least partially, regardless of their arrangement, to weaken their strength.

[0074] exist Figure 3c In the design, 64 punching units 110 are arranged in fifteen columns in a rhomboid structure. The diameter D of each punching unit 110 is... c The horizontal overlap width W between adjacent columns is 250mm. c The diameter is greater than that of the main reinforcing bar, and the spacing L between adjacent drilling units 110 in the same column is greater than that of the main reinforcing bar.c is 200 mm.

[0075] In order to make the punching operation of the multi-head punching device 100 cover the entire working area, Figure 4c The working sub-area layout corresponding to the arrangement of the punching units 110 in Figure 3c is shown. The multi-head punching device 100 of the circular structure performs the punching operation in the working sub-areas C1 to C9, which are arranged in a roughly nine-square grid as shown in the figure. In this way, the working area S c for the shield machine 600C to pass through. Since the lateral overlap width is greater than the diameter of the main reinforcement, the main reinforcement can be completely cut off regardless of the arrangement of the main reinforcement.

[0076] In Figure 3d , 52 punching units 110 are arranged in eleven columns, forming a circular structure. The diameter D d of each punching unit 110 is 250 mm, and the lateral overlap width W d between adjacent columns is greater than the diameter of the main reinforcement, and the spacing L d between adjacent punching units 110 in the same column is 200 mm.

[0077] In order to make the punching operation of the multi-head punching device 100 cover the entire working area, Figure 4d The working sub-area layout corresponding to the arrangement of the punching units 110 in Figure 3d is shown. The multi-head punching device 100 of the circular structure performs the punching operation in the working sub-areas D1 to D9, which are arranged in a roughly nine-square grid and slightly overlap as shown in the figure. In this way, the working area S d for the shield machine 600D to pass through. Similarly, since the lateral overlap width is greater than the diameter of the main reinforcement, the main reinforcement can be completely cut off regardless of the arrangement of the main reinforcement.

[0078] In Figure 3e , 112 punching units 110 are arranged in fifteen columns, forming a rectangular structure. The diameter D e of each punching unit 110 is 250 mm, and the lateral overlap width W e between adjacent columns is greater than the diameter of the main reinforcement, and the spacing L e between adjacent punching units 110 in the same column is 200 mm.

[0079] In order to make the punching operation of the multi-head punching device 100 cover the entire working area, Figure 4e The working sub-area layout corresponding to the arrangement of the punching units 110 in Figure 3eThe arrangement of the punching units 110 corresponds to the layout of the working sub-areas. The rectangular multi-head punching device 100 performs punching operations in working sub-areas E1 to E4, which are arranged in a continuous four-grid pattern as shown in the figure. Thus, all working sub-areas E1 to E4 together form the working area S. e This allows the 600E tunnel boring machine to pass through. Similarly, because the lateral overlap width is greater than the diameter of the main reinforcing bars, the main reinforcing bars can be completely cut off regardless of their arrangement.

[0080] exist Figure 3f In the design, 60 punching units are arranged in fifteen columns in a rectangular structure. Each punching unit has a diameter D of 110. f The horizontal overlap width W between adjacent columns is 250mm. f =W e The spacing L between adjacent punching units 110 in the same column f It is 650mm, which is essentially Figure 3e This is part of the arrangement of the punching units in the process.

[0081] In order to Figure 3f The punching unit in the middle implements Figure 3e The effect of the punched unit in the middle, Figure 4f The layout diagram of the corresponding partial work sub-area is shown. Figure 4f middle, Figure 3f The punching unit performs punching operations in working sub-regions F1 and F2, where the punching unit in working sub-region F2 is indicated by dashed lines. By overlapping two punching operations, the process roughly achieves... Figure 3e The single-drilling effect of the drilling unit in the image. Figure 4f On this basis, and then through similar Figure 4e The layout diagram of the working sub-areas allows for complete drilling operations within the working area. It is evident that to cut the main reinforcing bars to a length less than or equal to a specific value, in addition to setting the spacing between adjacent drilling units in the same column, this can also be achieved through a reasonable arrangement of the working sub-areas.

[0082] exist Figure 3g In the design, 56 punching units 110 are arranged in seven columns in a rectangular structure. The diameter D of each punching unit is... g The spacing is 250mm, and adjacent columns do not overlap in the horizontal direction. The spacing L between adjacent punched units 110 in the same column is [missing information]. g It is 200mm, and Figure 3f Similarly, Figure 3g The arrangement of the punching units in the middle is essentially as follows: Figure 3e This is part of the arrangement of the punching units in the process.

[0083] In order to Figure 3g The punching unit in the middle implementsFigure 3e the effect of the perforating units in the working sub-area G1, Figure 4g The corresponding working sub-area layout is shown. In Figure 4g the perforating units in the working sub-area G1, Figure 3g The perforating units in the working sub-area G1 and G2 perform the perforating operation, wherein the perforating units in the working sub-area G2 are indicated by dashed lines. Through the two times of perforating overlap, the single perforating effect of the perforating units in the working sub-area G1 is approximately achieved. On the basis of Figure 3e the perforating units in the working sub-area G1, Figure 4g the perforating units in the working sub-area G1, Figure 4e the perforating units in the working sub-area G1,

[0084] In particular, by reasonably controlling the number of perforating units 110, the distance between the adjacent perforating units 110 in each column, and the lateral distance between the perforating units 110 in adjacent columns, the perforating units 110 in Figure 3c and Figure 3e the perforating units 110 can be arranged in a substantially square structure. The perforating unit arrangement in the square structure helps to reduce the overlap area between adjacent working sub-areas and improve the working efficiency.

[0085] The perforating unit arrangement in the circular structure is particularly suitable for the crossing of small or micro shield machines. A plurality of perforating units are arranged in a circular structure with a diameter greater than or equal to the diameter of the shield machine, which can achieve single perforating crossing, greatly improving the construction efficiency.

[0086] The perforating units can also be arranged in other suitable manners, and the working sub-area layout is designed accordingly to cut the main reinforcement into a length less than or equal to a specific length.

[0087] In addition, in order to more efficiently and accurately complete the perforating operation, a plurality of multi-head perforating devices can be assembled into a multi-head perforating device group for use. The multi-head perforating device group can form a working area with sufficient area for the shield machine to cross through fewer perforating times, especially one time of perforating. In this case, the multi-head perforating device group can include a first perforating device and a second perforating device, and the two perforating devices can have different perforating unit arrangement manners, i.e., the shapes and / or sizes of the perforating units arranged in the two perforating devices are inconsistent.

[0088] Continuing to refer to FIG. 2, the multi-head perforating device 100 further includes a driving mechanism 120, and the plurality of perforating units 110 are arranged on one side of the driving mechanism 120. A driving device, such as a driving motor, is arranged in the driving mechanism 120, and the driving device can drive the plurality of perforating units 110 to operate.

[0089] Preferably, the plurality of perforating units 110 are divided into a plurality of groups of perforating units, each group of perforating units being independently driven, i.e. each group of perforating units can be selectively driven by its corresponding driving device independently.

[0090] Preferably, each perforating unit 110 is independently driven, i.e. each perforating unit 110 can be selectively driven by its corresponding driving device independently.

[0091] The driving mechanism 120 can be configured as a driving box with a sealing structure to prevent fluid outside the driving mechanism 120 from entering the inside of the driving mechanism 120.

[0092] The multi-head perforating device 100 can further comprise a support assembly, which is mainly used to support and fix the multi-head perforating device 100 in the working trench 200.

[0093] In the embodiment as shown in Figure 2a The support assembly comprises a first support part 130, a second support part 140, a first displacement mechanism 170 and a second displacement mechanism 180, wherein the first support part 130 is arranged on the side of the driving mechanism 120 where the plurality of perforating units 110 are arranged and is connected to the driving mechanism 120 through the second displacement mechanism 180, and the second support part 140 is arranged on the other side of the driving mechanism 120 and is connected to the driving mechanism 120 through the first displacement mechanism 170, so that the first displacement mechanism 170 can cause the relative movement between the first support part 130 and the second support part 140 and make the first support part 130 and the second support part 140 stretch in the longitudinal direction to support on the support wall in the longitudinal direction (including Figure 1 the wall of the underground continuous wall 500 and the retaining wall 400 opposite to it) to support and fix the multi-head perforating device 100, so as to facilitate the smooth perforating operation.

[0094] In this embodiment, when the multi-head perforating device 100 is supported and fixed, the second displacement mechanism 180 cooperates with the first displacement mechanism 170 to move the driving mechanism 120 relative to the first support part 130, so as to realize the feeding movement of the perforating units 110, e.g. the drill bit of the engineering water drill. In this case, the first displacement mechanism 170 and the second displacement mechanism 180 require smaller structure and occupy smaller space in the transverse direction, so that the multi-head perforating device 100 is more compact in structure and lighter in weight.

[0095] Similarly, the first shifting mechanism 170 can be positioned between the first support member 130 and the second support member 140, while the second shifting mechanism 180 can be positioned between the first support member 130 or the second support member 140 and the drive mechanism 120. In this way, the first support member 130 can still cause relative movement between the first support member 130 and the second support member 140, while the second shifting mechanism 180 independently causes the feed movement of the drive mechanism 120. In this case, the control of the feed movement of the drilling unit becomes relatively simple, requiring only the control of the second shifting mechanism 180.

[0096] In the above embodiments, the first shifting mechanism 170 can also minimize the distance between the first support component 130 and the second support component 140 to reduce the footprint of the multi-head punching device and facilitate transportation.

[0097] exist Figure 2a In a preferred embodiment, the first shifting mechanism 170 may include a plurality of first cylinders arranged between the drive mechanism 120 and the second support member 140 and a plurality of first stroke sensors for measuring the cylinder stroke of the plurality of first cylinders, the plurality of first cylinders driving the second support member 140 to move linearly relative to the drive mechanism 120 and thus relative to the first support member 130; the second shifting mechanism 180 may include a plurality of second cylinders arranged between the drive mechanism 120 and the first support member 130 and a plurality of second stroke sensors for measuring the cylinder stroke of the plurality of second cylinders, the plurality of second cylinders driving the drive mechanism 120 in a manner cooperating with the plurality of first cylinders to move linearly relative to the first support member 130.

[0098] When multiple first hydraulic cylinders drive the second support component 140 to move linearly relative to the drive mechanism 120 and the first support component 130, the first support component 130 and the second support component 140 can be supported on the support wall in the longitudinal direction to support and fix the multi-head drilling device 100. After the support and fixation are completed, if there is a large difference in the values ​​of multiple first stroke sensors, it indicates that the multi-head drilling device 100 has encountered tilting or uneven support wall. At this time, the position of the multi-head drilling device 100 can be readjusted, or during drilling, the multiple drilling units 110 can be driven individually or in groups according to the measurement data of the stroke sensors. In this way, the drilling unit 110 can be prevented from running idle, which would cause an imbalance in the load of the device 100.

[0099] In addition, the first and second stroke sensors can also provide ground operators with the ability to sense the forward and backward movement of the punching unit 110.

[0100] The first support component 130 can further include a guide end surface 132 which is substantially a flat surface for supporting on the support wall. A plurality of guide through holes 134 corresponding to the plurality of punching units 110 can be arranged on the guide end surface 132, and the plurality of punching units 110 respectively move in the plurality of guide through holes 134 to extend out of or retract from the guide end surface 132 under the cooperative driving of the first displacement mechanism 170 and the second displacement mechanism 180 to the driving mechanism 120, so as to realize the advancing and retreating of the punching units 110, so that the punching units 110 can penetrate or cut the steel bars inside the underground continuous wall 500. The guide through holes 134 can guide the plurality of punching units 110 and prevent the punching units 110 from tilting when resistance is encountered during the punching operation. A wear-resistant sleeve or wear-resistant coating can also be arranged in the guide through holes 134 to reduce wear when the punching units 110 extend out of or retract therefrom.

[0101] The second support component 140 can be configured in a ring shape, such as a circular ring or a rectangular ring, and the side surface opposite to the first support component 130 is substantially a flat surface for supporting on the support wall.

[0102] The multi-head punching device 100 can further include a hoisting member 160 which can be arranged in fixed connection with the driving mechanism 120.

[0103] The multi-head punching device 100 can further include a bracket for slidably supporting the driving mechanism 120, the first support component 130 and / or the second support component 140. The bracket can play a guiding and stabilizing role when hoisting the multi-head punching device 100, prevent the multi-head punching device 100 from turning during the process of being lowered, and also can play a protective role for the multi-head punching device. The hoisting member 160 described above can also be additionally or alternatively arranged in fixed connection with the bracket.

[0104] Figure 2b A perspective view of a second embodiment of the multi-head punching device 100 of the present application is shown, in addition to including the plurality of punching units 110, the driving mechanism 120 and the support assembly, the support assembly further includes a third support component 150 and a third displacement mechanism 190, wherein the four third support components 150 are connected with the first support component 130 through the four third displacement mechanisms 190, and the third support component 150 extends in the transverse direction and is finally supported on the support wall in the transverse direction under the action of the third displacement mechanism 190, where the support wall in the transverse direction can be the side wall of the working trench 200 or the mud protection wall formed on the side wall.

[0105] Figure 2c A perspective view of a third embodiment of the multi-head punching device 100 of the present application is shown, in addition to including the plurality of punching units 110, the driving mechanism 120 and the support assembly, the support assembly further includes a third support component 150 and a third displacement mechanism 190, wherein the four third support components 150 are connected with the first support component 130 through the four third displacement mechanisms 190, and the third support component 150 extends in the transverse direction and is finally supported on the support wall in the transverse direction under the action of the third displacement mechanism 190, where the support wall in the transverse direction can be the side wall of the working trench 200 or the mud protection wall formed on the side wall. Figure 2bDifferent from the first and second support components 130 and 140, the third support components 150 are connected to the second support components 140 through the third displacement mechanisms 190 (two third support components 150 and two third displacement mechanisms 190 are not shown). The third support components 150 are extended along the transverse direction under the action of the third displacement mechanisms 190 and are finally supported on the support wall in the transverse direction. The support wall in the transverse direction can be the side wall of the working trench 200 or the slurry protection wall formed on the side wall.

[0106] In the embodiments as shown in Figure 2b and Figure 2c , the third support components 150 can be legs arranged on both sides of the first support components 130 or the second support components 140, and the third displacement mechanisms 190 can be oil cylinders for driving the third support components 150 to extend or retract along the transverse direction, so that the multi-head perforating device 100 is fixedly supported or released.

[0107] In addition, in the embodiments as shown in Figure 2b and Figure 2c , the first support components 130 and the second support components 140 can be selectively supported on the support wall in the longitudinal direction; or after the third support components 150 are supported in the transverse direction by the third displacement mechanisms 190, the distance between the first support components 130 and the second support components 140 can be maintained by the cooperation of the first displacement mechanisms 170 and the second displacement mechanisms 180, and only the driving mechanism 120 can be driven to advance and retreat between the first support components 130 and the second support components 140.

[0108] Figure 5 The main steps of breaking the underground continuous wall 500 using the multi-head perforating device 100 are shown, including a trenching step, a lowering step, a perforating step and a breaking step. Other operation steps can also be added between the above steps to achieve specific functions. The steps will be described in detail below.

[0109] In the trenching step, the working trench 200 needs to be excavated on one side of the underground continuous wall 500, usually the side opposite to the side where the shield machine 600 is located. Referring to Figure 1 , the working trench 200 is usually excavated by using an existing trenching machine. The excavation site is located directly above the working area of the underground continuous wall 500, i.e., directly above the position where the shield machine 600 is intended to pass through. The trenching machine excavates along the vertical direction close to the wall of the underground continuous wall 500, so that the working trench 200 extends in the vertical direction until the working area on the underground continuous wall 500.

[0110] Depending on the geographical location of the construction site, the soil condition at the trenching site can vary greatly. In the case of a relatively solid soil, no special treatment of the soil can be required, and the trench wall of the working trench 200 can be ensured not to collapse during the construction. In the case of a soil that is not solid enough, soil reinforcement, such as tri-axial mixing pile, can be performed before the trenching step, and / or the filling step can be performed. In the case of a weaker soil, a reinforced concrete free continuous wall or a cuttable concrete continuous wall, for example, with a thickness of 600 mm, preferably three sides (the fourth side leaning against the old continuous wall to be broken) can be made as a retaining wall around the working trench 200.

[0111] In the filling step, the working trench 200 can be filled with a fluid filling material. The fluid filling material can be a bentonite-modified mud, which can also form a mud retaining wall 400 on the trench wall of the working trench 200. The mud retaining wall 400 not only prevents the trench wall from collapsing, but also serves as a support wall for the multi-head boring device 100.

[0112] By using the filling step, soil reinforcement, and / or using a reinforced concrete free continuous wall or a cuttable concrete continuous wall to prevent the trench wall from collapsing and to establish a mud retaining wall 400 that can be supported, the underground construction can be ensured to proceed smoothly, and the safety risk is greatly reduced since no workers need to enter the working trench 200 for construction. This method has great advantages in terms of cost, safety risk, and construction period compared to the method of constructing a new four-sided reinforced underground continuous wall to form a clearance working well, and then dispatching workers to manually break down the underground continuous wall in the well.

[0113] In the lowering step, the multi-head boring device 100 is lowered into the working trench 200 by a hoisting device until the working area on the underground continuous wall 500. The hoisting device can perform lifting and translation operations on the multi-head boring device 100 to transport the multi-head boring device 100 to the working area.

[0114] The hoisting device can be provided with sensor assemblies, such as displacement sensors, angle sensors, etc. These sensor assemblies can sense the horizontal and vertical positions of the multi-head boring device 100 to accurately position the multi-head boring device 100. Thus, in the lowering step, the lowering step of the multi-head boring device 100 can be performed using the sensor assemblies on the hoisting device and based on the data sensed by the sensor assemblies, and it can be determined whether the multi-head boring device 100 has reached the predetermined working area.

[0115] The hoisting device can include a movable crane and Figure 1The fixed gantry-type line-hoist mechanism 300 is shown in FIG. 1. When the line-hoist mechanism 300 is used, a rigging step needs to be performed before the lowering step is performed, to rig the line-hoist mechanism 300 on the ground around the work trench 200.

[0116] To enable the multi-head perforating apparatus 100 to be supported and fixed at the work area, a supporting step can also be performed, for example, in which the first displacement mechanism 170 is driven to support the first support member 130 on the underground continuous wall 500 and the second support member 140 on the wall of the work trench 200 or the slurry protection wall 400 formed by the slurry. Figure 2a In an embodiment of the multi-head perforating apparatus 100, the first displacement mechanism 170 is driven to support the first support member 130 on the underground continuous wall 500 and the second support member 140 on the wall of the work trench 200 or the slurry protection wall 400 formed by the slurry.

[0117] In the perforating step, the multi-head perforating apparatus 100 is used to perforate the work area to a predetermined depth. For example, when the perforating unit is a drill bit of a water jet machine, the second displacement mechanism 180 is driven to feed the drill bit of the water jet machine forward, extending from the guide end surface 132 of the first support member 130, to drill the drill bit into the underground continuous wall 500 and further into the underground continuous wall 500 to achieve cutting or truncation of the reinforcing steel bars in the underground continuous wall 500. After the drill bit is fed to the predetermined depth, the second displacement mechanism 180 is driven to withdraw the drill bit backward, retracting from the guide end surface 132 of the first support member 130.

[0118] In the case where the supporting step is performed, to release the support and fixation of the multi-head perforating apparatus 100, a releasing step can also be included, for example, in which the first displacement mechanism 170 is driven to move the first support member 130 and the second support member 140 away from the underground continuous wall 500 and the slurry protection wall 400, respectively, to achieve the purpose of releasing the multi-head perforating apparatus 100. Figure 2a In an embodiment of the multi-head perforating apparatus 100, the first displacement mechanism 170 is driven to move the first support member 130 and the second support member 140 away from the underground continuous wall 500 and the slurry protection wall 400, respectively, to achieve the purpose of releasing the multi-head perforating apparatus 100.

[0119] As mentioned previously, when the perforating unit 110 of the multi-head perforating apparatus 100 cannot completely cover the entire area of the work area, it is necessary to consider performing the perforating operation on the work area in steps, i.e., dividing the work area into a plurality of work sub-areas and having the multi-head perforating apparatus 100 perform the perforating operation on each of the plurality of work sub-areas in turn.

[0120] As mentioned previously, an assembling step can also be performed to assemble a plurality of multi-head perforating apparatuses 100 into a multi-head perforating apparatus group, where the plurality of multi-head perforating apparatuses 100 can be identical or different, for example, in the shape and / or size in which the perforating units 110 are arranged.

[0121] In one embodiment, the following steps can be performed to implement the perforating operation of the multi-head perforating device 100 on the plurality of working sub-areas: performing a hoisting step, hoisting the multi-head perforating device 100 to a first working sub-area in the plurality of working sub-areas by the hoisting device and based on, for example, data sensed by the sensor assembly; performing a perforating step, perforating on the first working sub-area by the multi-head perforating device 100 to a predetermined depth; performing a shifting step, shifting the multi-head perforating device 100 to a next working sub-area in the plurality of working sub-areas by the hoisting device and based on, for example, data sensed by the sensor assembly; performing a perforating step, perforating on the next working sub-area by the multi-head perforating device 100 to a predetermined depth; and repeating the shifting step and the perforating step until the multi-head perforating device 100 traverses each working sub-area in the plurality of working sub-areas.

[0122] As mentioned above, in order to stably perform the perforating step, the supporting step and the releasing step can also be performed before and after each perforating step, respectively.

[0123] As mentioned above, the plurality of working sub-areas can be arranged continuously or overlappingly on the underground diaphragm wall 500. In addition, the working area formed by the plurality of working sub-areas covers the tunnel cross-section left by the shield machine 600 when traversing the underground diaphragm wall 500, i.e., the area of the working area is greater than or equal to the tunnel cross-sectional area.

[0124] When the multi-head perforating device 100 completes the perforating operation on the working area or all the working sub-areas, a breaking step is performed to break the underground diaphragm wall 500 via the working area. Figure 1 In the illustrated embodiment, the breaking step includes maneuvering the shield machine 600 to break and traverse the underground diaphragm wall 500 via the working area.

[0125] In certain embodiments, for example, before the shield machine 600 traverses the underground diaphragm wall 500, a hoisting step and a backfilling step also need to be performed. In the hoisting step, the multi-head perforating device 100 is hoisted by the hoisting device to provide sufficient space for the traversal of the shield machine 600. In the backfilling step, earthwork needs to be backfilled into the working trench 200, and when the filling step exists, the fluid filler can also be extracted synchronously in the backfilling step.

[0126] Since the multi-head perforating device 100 has completely cut the steel bars in the working area of the underground diaphragm wall 500 to a length less than or equal to a specific length, the shield machine 600 is less likely to damage the blades when traversing the underground diaphragm wall 500 via the working area, and the problems of steel bar entangling the cutterhead or clogging the auger are also less likely to occur, so that the shield machine 600 can continuously traverse the underground diaphragm wall 500 without the need to open the chamber to replace the blades, greatly reducing the safety risks in construction and also reducing the construction period and cost.

[0127] The above description of various embodiments of the application is provided to one of ordinary skill in the relevant art for the purpose of demonstrating the application. The application is not intended to be exclusive or limited to a single disclosed embodiment. As described above, various alternatives and modifications to the present application are of course possible. Accordingly, while specific embodiments have been illustrated and described, it is the intention that the application be practiced otherwise than as specifically described. The present application is intended to cover what is claimed and any equivalents.

[0128] BRIEF DESCRIPTION OF DRAWINGS

[0129] 100 multi-head perforating apparatus

[0130] 110 perforating unit

[0131] 120 drive mechanism

[0132] 130 first support member

[0133] 132 guide end face

[0134] 134 guide through hole

[0135] 140 second support member

[0136] 150 third support member

[0137] 160 hoisting member

[0138] 170 first displacement mechanism

[0139] 180 second displacement mechanism

[0140] 190 third displacement mechanism

[0141] 200 work slot

[0142] 300 row hoist mechanism

[0143] 400 slurry wall

[0144] 500 diaphragm wall

[0145] 600, 600C, 600D, 600E shield machine

[0146] 700 ground surface

[0147] 800 subway station

[0148] A1-An work sub-area

[0149] B1-Bn work sub-area

[0150] C1-C9 working sub-areas

[0151] D1-D9 working sub-areas

[0152] E1-E4 working sub-areas

[0153] F1-F2 working sub-areas

[0154] G1-G2 working sub-areas

[0155] S n working area

[0156] D n punch unit diameter

[0157] W n lateral overlap width between adjacent columns of punch units

[0158] L n pitch between adjacent punch units in the same column

Claims

1. A multi-head piercing device (100) for piercing a diaphragm wall (500) to break the diaphragm wall, the multi-head piercing device comprising: a plurality of piercing units (110) arranged in one or more columns, at least one of the one or more columns having two or more piercing units, a spacing between adjacent piercing units of the two or more piercing units being no more than a predetermined spacing, the predetermined spacing being equal to or a multiple of a specific length at which a main reinforcement in the diaphragm wall is desired to be finally cut; a driving mechanism (120) on a side of which the plurality of piercing units are arranged, the driving mechanism having at least one driving device arranged therein, the at least one driving device being capable of driving the plurality of piercing units to operate; and a support assembly comprising a first support member (130), a second support member (140) and a first displacement mechanism (170), wherein the first displacement mechanism causes a relative linear motion between the first support member and the second support member.

2. The multi-head perforating apparatus of claim 1, wherein, The diameter of the piercing unit is no less than the diameter of the main reinforcement in the diaphragm wall, and the diameter of the piercing unit is no less than 100 mm.

3. The multi-head perforating apparatus of claim 1, wherein, The predetermined spacing is 300 mm, or 250 mm, or 200 mm.

4. The multi-head perforating apparatus of claim 2, wherein, When the plurality of piercing units are arranged in multiple columns, each piercing unit in adjacent columns is arranged staggered in a vertical direction and overlapped in a horizontal direction.

5. The multi-head perforating apparatus of claim 4, wherein, The plurality of piercing units in adjacent columns are overlapped in the horizontal direction by a width no less than a predetermined width.

6. The multi-head perforating apparatus of claim 5, wherein, The predetermined width is related to the diameter of the main reinforcement used in the diaphragm wall, and the predetermined width is 28 mm or 32 mm.

7. The multi-head perforating apparatus of claim 1, wherein, The plurality of piercing units are arranged in a substantially linear, triangular, circular, diamond or rectangular structure.

8. The multi-head perforating apparatus of claim 1, wherein, The number of the plurality of piercing units is no less than 4, or no less than 10, or no less than 50.

9. The multi-head perforating apparatus of claim 1, wherein, The support assembly further comprises a second displacement mechanism (180) which separately or in cooperation with the first displacement mechanism causes a relative linear motion between the first support member and the driving mechanism.

10. The multi-head perforating apparatus of claim 9, wherein, The first support member is arranged on a side of the driving mechanism on which the plurality of piercing units are arranged and is connected to the driving mechanism by the second displacement mechanism, and the second support member is arranged on the other side of the driving mechanism and is connected to the driving mechanism by the first displacement mechanism.

11. The multi-head perforating apparatus of claim 10, wherein, The first support member comprises a guide end face (132) on which a plurality of guide through holes (134) corresponding to the plurality of piercing units are arranged, when the second displacement mechanism causes a relative motion between the first support member and the driving mechanism, the plurality of piercing units respectively move in the plurality of guide through holes to extend out of or retract from the guide end face.

12. The multi-head perforating apparatus of claim 9, wherein, The first and second displacement mechanisms include a cylinder and a stroke sensor for measuring a stroke of the cylinder, and the plurality of perforating units can be individually driven or collectively driven according to the measurement data of the stroke sensor.

13. The multi-head perforating apparatus of claim 11, wherein, A wear-resistant sleeve or a wear-resistant coating is arranged in the guide through hole.

14. The multi-head perforating apparatus of claim 1, wherein, The multi-head perforating device further comprises a hoisting member (160) fixedly connected with the driving mechanism.

15. The multi-head perforating apparatus of claim 1, wherein, The multi-head perforating device further comprises a bracket for slidably supporting the driving mechanism, the first support component and / or the second support component.

16. The multi-head perforating apparatus of claim 15, wherein, The multi-head perforating device further comprises a hoisting member fixedly connected with the bracket.

17. The multi-head perforating apparatus of claim 1, wherein, The driving mechanism is configured as a driving box with a sealing structure to prevent fluid outside the driving mechanism from entering the inside of the driving mechanism.

18. A method for breaking a underground continuous wall, the method comprising: performing a trenching step to excavate a work trench on one side of the underground continuous wall, the work trench extending in a vertical direction to a work area of the underground continuous wall; performing a lowering step to lower the multi-head perforating device according to any one of claims 1 to 17 into the work trench by a hoisting device, until a work area on the underground continuous wall, wherein the hoisting device is capable of performing lifting and translation operations on the multi-head perforating device; performing a perforating step to perforate the work area to a predetermined depth by the multi-head perforating device; and performing a breaking step to break the underground continuous wall via the work area.

19. The method of claim 18, wherein, The work area comprises a plurality of work sub-areas, and the method further comprises: performing a lowering step to lower the multi-head perforating device to a first work sub-area of the plurality of work sub-areas by the hoisting device; performing a perforating step to perforate the first work sub-area to a predetermined depth by the multi-head perforating device; performing a displacement step to displace the multi-head perforating device to a next work sub-area of the plurality of work sub-areas by the hoisting device; performing a perforating step to perforate the next work sub-area to a predetermined depth by the multi-head perforating device; repeating the displacement step and the perforating step until the multi-head perforating device traverses the plurality of work sub-areas.

20. The method of claim 19, wherein, The plurality of work sub-areas are arranged continuously or overlappingly on the underground continuous wall.

21. The method of claim 19, wherein, The work area formed by the plurality of work sub-areas covers a tunnel cross-section left after breaking the underground continuous wall.

22. The method of claim 18 or 19, wherein, The hoisting device is provided with a sensor assembly capable of sensing the horizontal and vertical positions of the multi-head perforating device.

23. The method of claim 22, wherein, The lowering step or the displacement step is performed based on the data sensed by the sensor assembly.

24. The method of claim 18 or 19, wherein, Before the perforating step, a supporting step is further included, in which a displacement mechanism of the multi-head perforating device supports a support component of the multi-head perforating device on a support wall in the work trench.

25. The method of claim 24, wherein, After the perforating step, a releasing step is further included, in which the displacement mechanism is driven to move the support component away from the support wall.

26. The method of claim 18, wherein, The multi-head piercing device includes a multi-head piercing device group assembled by a plurality of multi-head piercing devices.

27. The method of claim 26, wherein, The multi-head piercing device group includes a first multi-head piercing device and a second multi-head piercing device, and the piercing units of the first multi-head piercing device and the second multi-head piercing device are arranged in different shapes and / or sizes.

28. The method of claim 18, wherein, The method further includes a filling step of filling the work trench with a fluid filler.

29. The method of claim 28, wherein, The method further includes a backfilling step of backfilling earthwork into the work trench and drawing out the fluid filler.

30. The method of claim 28 or 29, wherein, The fluid filler includes a slurry, and the slurry forms a slurry protection wall on the trench wall of the work trench.

31. The method of claim 18, wherein, Before the trenching step, soil reinforcement is performed at the trench wall of the work trench.

32. The method of claim 18, wherein, before the trenching step, a reinforced concrete continuous wall or a cuttable concrete continuous wall is made at the periphery of the work trench, and the reinforced concrete continuous wall or the cuttable concrete continuous wall has a thickness of 600 mm.

33. The method of claim 18, wherein, The method further includes a hoisting step of hoisting the multi-head piercing device by the hoisting device.

34. The method of claim 18, wherein, The breaking step includes crossing the underground continuous wall via the working area by a shield machine.

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