A deep foundation pit construction dynamic support device and method

Abstract

The application discloses a kind of deep foundation pit construction dynamic support device and method, it is related to engineering construction technical field.The application is installed dynamic monitoring component by seeking location between the support pad of expansion shell prestressed anchor rod and channel steel solid part, when installing dynamic monitoring component, the fastening installation of all dynamic monitoring components on the same support pad is rapidly assisted to complete using tester, and dynamic monitoring component on support pad is connected with branch line, the initial current test of dynamic monitoring component (group) connected by all branch lines is independently carried out using multiple I / O output ports of single-chip microcomputer, and the normal current monitoring of dynamic monitoring component (group) connected by all branch lines is periodically carried out by single-chip microcomputer, to detect the stress posture change of anchor rod support pad timely and accurately, to provide convenience for engineering personnel to find potential safety hazard of foundation pit soil layer in time, to prevent the occurrence of engineering accident to some extent.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engineering construction, and in particular to a deep foundation pit construction dynamic supporting device and method. BACKGROUND

[0002] With the rapid development and promotion of economic construction, the construction and safety protection of foundation pits are problems that many construction units need to pay great attention to in the construction process of various building projects. After the expansion shell prestressed anchor rod is inserted into the stable soil layer obliquely downward through the sliding surface and is completely fixed by rapid grouting, the entire foundation pit surface layer can be fixed by means of the installed channel steel.

[0003] However, after the expansion shell prestressed anchor rod is installed, it is still necessary to regularly inspect the reinforcement stability of the foundation pit surface layer. Sometimes, due to various external factors, the internal stress of the soil layer changes slightly, which is difficult for people to directly observe with the naked eye. The slight change in the internal stress of the soil layer leads to a decrease in the reinforcement degree of the expansion shell prestressed anchor rod in the local area, which may cause a large potential safety hazard. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a deep foundation pit construction dynamic supporting device and method, so as to timely and accurately detect the stress posture change of the anchor rod supporting pad, provide convenience for engineers to timely find potential safety hazards of the foundation pit soil layer, and prevent engineering accidents to a certain extent.

[0005] To solve the above technical problems, the present application is realized by the following technical scheme:

[0006] The present application provides a deep foundation pit construction dynamic supporting device, which comprises a channel steel for supporting the foundation pit surface layer, a supporting pad is installed on one side of the channel steel of the channel steel, the supporting pad is provided with a center hole, the supporting pad is provided with a hollow anchor rod body obliquely inserted into the foundation pit surface layer, the hollow anchor rod body is provided with an inclined pad in contact with the supporting pad, the hollow anchor rod body is provided with an anchor rod fixing nut in extrusion contact with the inclined pad, the supporting pad is provided with a plurality of plug-in areas, the plug-in area comprises a group of oppositely arranged edge frame plates, the edge frame plate is L-shaped, a plurality of T-shaped frame plates are arranged between the group of edge frame plates, the edge frame plates and the T-shaped frame plates in the same plug-in area are parallel to each other, and the edge frame plates and the T-shaped frame plates and the adjacent T-shaped frame plates form outer gaps and inner gaps. Wherein, a plurality of array insertion holes in communication with the inner gaps are formed in the supporting pad at the position of each inner gap.

[0007] One of the inner gap positions of each insertion area is provided with a clamping nut aligned with any one array jack, and each insertion area is provided with a dynamic monitoring assembly installed at the position of the outer gap, the clamping nut and the array jack.

[0008] The dynamic support device further comprises a tester, which is provided with a constant voltage source and an external interface, and a circuit connected between the constant voltage source and the external interface is provided with an ammeter and an ammeter display. The dynamic support device further comprises a host computer, which is provided with a single-chip microcomputer, a power module and a current detection module connected to the single-chip microcomputer, and a bus connected to an I / O output terminal of the single-chip microcomputer, wherein each branch line is independently connected to one of the I / O output terminals of the single-chip microcomputer.

[0009] As a preferred technical solution of the present application: the distance between one group of opposite edges of the clamping nut is h, the diameter of the screw hole of the clamping nut is Da, the opening longitudinal height of the outer gap is Lw, the longitudinal height of the inner gap section is Ln, and the hole diameter of the array jack is Dc, then Ln>h>Lw>Da>Dc.

[0010] As a preferred technical solution of the present application: the hollow bolt comprises a hexagonal nut, a first threaded rod, and a threaded groove penetrating the hexagonal nut and the first threaded rod, and the first threaded rod is screwed on the clamping nut. The pressure-sensitive piece comprises a second threaded rod fixedly connected with the pressure-sensitive resistor, and the second threaded rod is screwed on one side of the threaded groove. The electric connector comprises a third threaded rod, and the third threaded rod is screwed on the other side of the threaded groove. The screw thread direction of the second threaded rod is opposite to that of the third threaded rod.

[0011] As a preferred technical solution of the present application: the second threaded rod is provided with an electric socket at the side end, the electric socket is provided with a first inner electric contact inside, and the second threaded rod is provided with a first outer electric contact ring on the side surface. The third threaded rod is provided with an electric plug rod at one end, the electric plug rod is inserted into the electric socket, the electric plug rod is provided with a front end electric contact at the front end, and the electric plug rod is provided with a ring side electric contact ring matched with the first outer electric contact ring.

[0012] As a preferred technical solution of the present application: the pressure-sensitive resistor is inserted into the array jack, and the length of the pressure-sensitive resistor is greater than the length of the array jack.

[0013] As a preferred technical solution of the present application: the ammeter and the ammeter display are connected through an analog-to-digital conversion module, and when testing, the electric plug is inserted into the external interface.

[0014] As a preferred technical scheme of the present application: each branch line is connected with a branch connector, and the electric plug is plugged in the position of the branch connector.

[0015] The present application provides a deep foundation pit construction dynamic support method, comprising the following contents:

[0016] Link one, support installation: the channel steel part, support pad, inclined pad, hollow anchor rod body and anchor rod fixing nut are fixedly installed, and the grouting operation of the hollow anchor rod body is completed.

[0017] Link two, dynamic monitoring component positioning installation: on the "up", "down", "left" and "right" four plug-in areas of the support pad, find the arrayed jack that is blocked by the channel steel solid part on each plug-in area, and install the dynamic monitoring component at the position of the arrayed jack that is closest to the center of the plug-in area.

[0018] Link three, contact degree test and fastening: first, plug the electric plug into the external interface of the tester, turn on the tester, and observe the current meter display of the tester. Then, rotate the hollow bolt of the dynamic monitoring component at one of the plug-in area positions in the tightening direction, and observe the change of the current meter display of the tester again. If the current meter display decreases, it means that the fastening has been completed, and the dynamic monitoring component is stopped from being continuously tightened. Finally, rotate the hollow bolts of the dynamic monitoring components at the remaining three plug-in area positions in the tightening direction until the current meter display is observed to decrease, and the dynamic monitoring component is stopped from being continuously tightened.

[0019] Link four, access to the monitoring line system: first, after the dynamic monitoring components are installed at the four plug-in area positions of the support pad, electrically connect the dynamic monitoring components with the branch lines. Then, after the dynamic monitoring components on all support pads are electrically connected with the branch lines at the corresponding positions, turn on the main control machine, and the single-chip microcomputer in the main control machine performs multiple initial current parameter test collections. Each initial current parameter test collection only tests and collects the initial current of one branch line, and the obtained initial current parameter information is stored in the ROM memory of the single-chip microcomputer.

[0020] Link five, normal monitoring: the single-chip microcomputer in the main control machine periodically collects normal currents of all branch lines. Each time the normal current is collected, only the circuit in which one branch line is located is turned on, and the obtained normal current is compared with the initial current. If the difference between the normal current and the initial current is greater than the threshold value preset by the system, an alarm information is output.

[0021] In addition, when performing the initial current parameter test collection and the normal current collection, the single-chip microcomputer sequentially controls the single I / O output port according to the address order of the I / O output port.

[0022] Compared with the prior art, the present application has the beneficial effects that:

[0023] The present application installs the dynamic monitoring assembly between the support pad plate and the channel steel body of the expanded shell prestressed anchor rod, uses the tester to quickly and auxiliary complete the fastening installation of all dynamic monitoring assemblies on the same support pad plate during installation of the dynamic monitoring assembly, connects the dynamic monitoring assemblies on the support pad plate with branch lines, uses the multiple I / O output ports of the single-chip microcomputer to independently perform initial current testing on the dynamic monitoring assemblies (groups) connected with the branch lines, and periodically performs normal current monitoring on the dynamic monitoring assemblies (groups) connected with the branch lines through the single-chip microcomputer, so as to timely and accurately detect the stress posture change of the anchor rod support pad plate, provide convenience for engineers to timely find potential safety hazards of the foundation pit soil layer, and to a certain extent, prevent the occurrence of engineering accidents. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a schematic view of the expanded shell prestressed anchor rod installed in the foundation pit surface layer in the present application.

[0025] Figure 2 It is a schematic view of the front side of the support pad plate in the present application.

[0026] Figure 3 It is a (side view section) schematic view of the dynamic monitoring assembly when installed on the support pad plate and the connection of the dynamic monitoring assembly with the tester.

[0027] Figure 4 It is a (side view section) schematic view of the mutual cooperation of the dynamic monitoring assembly, the clamping nut and the support pad plate in the present application.

[0028] Figure 5 It is a disassembled schematic view of the dynamic monitoring assembly components in the present application.

[0029] Figure 6 It is a schematic view of the electrical connector in the present application.

[0030] Figure 7 It is a schematic view of the hollow bolt in the present application.

[0031] Figure 8 It is a schematic view of the pressure-sensitive piece in the present application.

[0032] Figure 9 It is a circuit logic schematic view of the tester and the pressure-sensitive resistor in the present application.

[0033] Figure 10 It is a connection schematic view of the dynamic monitoring assembly and the branch line in the present application.

[0034] Figure 11 It is a circuit logic schematic view of the host computer in the present application.

[0035] Wherein: 1 - foundation pit surface layer; 2 - channel steel; 3 - channel steel solid part; 4 - support pad, 401 - center hole, 402 - array jack, 403 - T-shaped frame plate, 404 - edge frame plate, 405 - outer gap, 406 - inner gap; 5 - hollow anchor rod body; 6 - inclined pad; 7 - anchor rod fixing nut; 8 - steel expansion shell anchor head; 9 - dynamic monitoring assembly, 901 - hollow bolt, 9011 - hexagonal nut, 9012 - first threaded rod, 9013 - threaded slot, 902 - pressure sensitive component, 9021 - pressure sensitive resistor, 9022 - second threaded rod, 9023 - electrical socket, 9024 - first internal electrical contact, 9025 - first external electrical contact ring, 903 - electrical connector, 9031 - third threaded rod, 9032 - electrical plug rod, 9033 - front end electrical contact, 9034 - ring side electrical contact ring, 9035 - rotary mounting rod, 904 - wire, 905 - electrical plug; 10 - clamping nut; 11 - bus; 12 - branch line; 13 - branch plug-in connector; 14 - tester, 1401 - constant voltage source, 1402 - external interface, 1403 - ammeter, 1404 - ammeter display; 15 - host computer, 1501 - single-chip microcomputer, 1502 - power module; 1503 - current detection module; S - plug-in area. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0037] Example one, the present application relates to a deep foundation pit construction dynamic support device, its main structure characteristics are as follows:

[0038] Please refer to Figure 1 , channel steel 2 supports foundation pit surface layer 1, support pad 4 is located outside the channel steel solid part 3 of channel steel 2, the most front end of hollow anchor rod body 5 is spirally installed with steel expansion shell anchor head 8, hollow anchor rod body 5 is inserted into foundation pit surface layer 1 obliquely through support pad 4, hollow anchor rod body 5 passes through the center hole 401 in the middle of support pad 4, inclined pad 6 is sleeved on hollow anchor rod body 5, inclined pad 6 is in contact with support pad 4, anchor rod fixing nut 7 is installed on the outer side of inclined pad 6, and anchor rod fixing nut 7 tightly fixes hollow anchor rod body 5.

[0039] Please refer to Figure 2 , support pad 4 can be provided with plug-in area S on the upper, lower, left, right or other areas, each plug-in area S is provided with a group of relatively arranged edge frame plates 404, and a plurality of T-shaped frame plates 403 are arranged between the group of edge frame plates 404. The same plug-in area S: the edge frame plates 404 and the T-shaped frame plates 403 are parallel to each other.

[0040] Please refer to Figure 3 、 Figure 4 , the edge frame plate 404 is L-shaped in cross section, and the T-shaped frame plate 403 is T-shaped in cross section, and the edge frame plate 404 and the T-shaped frame plate 403 and the adjacent T-shaped frame plate 403 form an outer gap 405 and an inner gap 406. At the position of each inner gap 406, the support pad plate 4 is provided with a plurality of array insertion holes 402, and the array insertion hole 402 is communicated with the inner gap 406, for example Figure 2 At the position of each inner gap 406, the support pad plate 4 is provided with at least three array insertion holes 402. One of the inner gaps 406 at each insertion area S is provided with a clamping nut 10, and the clamping nut 10 is aligned with any one of the array insertion holes 402. Each insertion area S is provided with at least one dynamic monitoring assembly 9, and the dynamic monitoring assembly 9 is installed at the position of the outer gap 405, the clamping nut 10 and the array insertion hole 402. The longitudinal height dimension of the inner gap 406 section, the distance between the opposite sides of the clamping nut 10, the opening longitudinal height dimension of the outer gap 405, the hole diameter dimension of the clamping nut 10 and the hole diameter dimension of the array insertion hole 402 are reduced one by one. As Figure 4 The longitudinal height dimension of the inner gap 406 section is greater than the cross-sectional height dimension of the outer gap 405.

[0041] Please refer to Figure 5 The dynamic monitoring assembly 9 comprises a hollow bolt 901, a pressure-sensitive part 902 and an electrical connector 903. The pressure-sensitive part 902 is screwed on one side of the hollow bolt 901, and the electrical connector 903 is screwed on the other side of the hollow bolt 901. In combination Figure 10 The electrical connectors 903 of a plurality of dynamic monitoring assemblies 9 are connected in parallel through wires 904 and connected to the same electrical plug 905.

[0042] Please refer to Figure 6 The electrical connector 903 comprises a third threaded rod 9031. In combination Figure 8 The second threaded rod 9022 and the third threaded rod 9031 are opposite in screw direction. In combination Figure 5 、 Figure 7 The third threaded rod 9031 is screwed in the other side of the threaded groove 9013. The third threaded rod 9031 is provided with an electrical plug rod 9032 at one side end, and the electrical plug rod 9032 is provided with a front end electrical contact 9033 at the front side end. In combination Figure 8 The electrical plug rod 9032 is inserted into the electrical slot 9023, and the electrical plug rod 9032 is provided with a ring side electrical contact ring 9034 matched with the first outer electrical contact ring 9025. The front end electrical contact 9033 and the ring side electrical contact ring 9034 are electrically connected with the wire 904.

[0043] Please refer to Figure 7The hollow bolt 901 comprises a hexagonal nut 9011, a first threaded rod 9012, and a threaded through slot 9013. The threaded through slot 9013 penetrates the hexagonal nut 9011 and the first threaded rod 9012. Figure 3 、 Figure 5 The first threaded rod 9012 is screwed on the clamping nut 10.

[0044] Please refer to Figure 8 The pressure-sensitive member 902 comprises a second threaded rod 9022 (in combination with Figure 5 、 Figure 7 The second threaded rod 9022 is screwed on one side of the threaded through slot 9013. The second threaded rod 9022 is fixedly connected with the pressure-sensitive resistor 9021. An electric plug slot 9023 is formed at the side end of the second threaded rod 9022. A first inner electric contact 9024 is arranged inside the electric plug slot 9023. A first outer electric contact ring 9025 is arranged on the side end surface of the second threaded rod 9022. The first inner electric contact 9024 and the first outer electric contact ring 9025 are connected in series with the pressure-sensitive resistor 9021. In combination with Figure 1 、 Figure 3 The pressure-sensitive resistor 9021 of the pressure-sensitive member 902 is in extrusion contact with the groove steel solid part 3 of the groove steel member 2.

[0045] Please refer to Figure 3 、 Figure 4 、 Figure 8 The pressure-sensitive resistor 9021 is inserted at the position of the array jack 402. The length of the pressure-sensitive resistor 9021 is greater than the length of the array jack 402, and can also be considered to be greater than the thickness of the support backing plate 4.

[0046] Please refer to Figure 9 The tester 14 is configured with a constant voltage source 1401, an external interface 1402, an ammeter 1403, and an ammeter display 1404. The ammeter 1403 and the ammeter display 1404 are connected in series on the circuit between the constant voltage source 1401 and the external interface 1402. An analog-to-digital conversion module is arranged between the ammeter 1403 and the ammeter display 1404. (in combination with Figure 3 、 Figure 5 When testing, the electric plug 905 is plugged at the position of the external interface 1402.

[0047] Please refer to Figure 10 、 Figure 11The master control machine 15 is provided with a single-chip microcomputer 1501, a power module 1502, and a current detection module 1503, and the power module 1502 and the current detection module 1503 are connected with the single-chip microcomputer 1501. The I / O output end of the single-chip microcomputer 1501 is connected with the bus 11, and the bus 11 comprises a plurality of branch lines 12, each of which is independently connected with one of the I / O output ports of the single-chip microcomputer 1501. Each branch line 12 is connected with a branch connector 13, and the electric plug 905 is connected with the branch connector 13.

[0048] In the embodiment two, when the dynamic monitoring assembly is installed, the second threaded rod 9022 of the pressure-sensitive part 902 is screwed and installed in the threaded through slot 9013 of the hollow bolt 901, and attention is paid to the installation from the side of the first threaded rod 9012. Then, the clamping nut 10 is installed in the inner gap 406 from the side, an array jack 402 blocked (or partially blocked) by the solid part 3 of the channel steel is found, the clamping nut 10 is aligned with the array jack 402, the pressure-sensitive resistor 9021 of the pressure-sensitive part 902 is passed through the clamping nut 10, the pressure-sensitive resistor 9021 is inserted into the array jack 402, the first threaded rod 9012 of the hollow bolt 901 is screwed on the clamping nut 10, and the first threaded rod 9012 of the hollow bolt 901 is further screwed until the hollow bolt 901 is not shaken and the screwing of the hollow bolt 901 is stopped. Then, the electric connector 903 is installed, the third threaded rod 9031 of the electric connector 903 is screwed and installed in the threaded through slot 9013 of the hollow bolt 901 exposed outside, and the installation of the entire dynamic monitoring assembly 9 on the support pad 4 is completed.

[0049] In the embodiment three, the deep foundation pit construction dynamic supporting method mainly includes the following steps: supporting installation, dynamic monitoring assembly positioning installation, contact degree testing and fastening, monitoring line system connection, and normalization monitoring.

[0050] I. Supporting installation: the channel steel 2, the support pad 4, the inclined pad 6, the hollow anchor rod body 5, and the anchor rod fixing nut 7 are fixed and installed, and the grouting operation of the hollow anchor rod body 5 is completed.

[0051] II. Dynamic monitoring assembly positioning installation: in the "up", "down", "left", and "right" four plug-in areas S of the support pad 4, an array jack 402 blocked by the solid part 3 of the channel steel is found in each plug-in area S, and a dynamic monitoring assembly 9 is installed at a position of the array jack 402 closest to the center of the plug-in area S.

[0052] III. Contact test and fastening: First, plug the electrical plug 905 into the external interface 1402 of the tester 14, open the tester 14, and observe the ammeter display of the tester 14. Then, rotate the hollow bolt 901 of the dynamic monitoring assembly 9 in the position of one of the four installation areas S in the tightening direction, and observe the change of the ammeter display 1404 of the tester 14 again. If the ammeter display 1404 decreases, it means that the fastening has been completed, and the rotation of the dynamic monitoring assembly 9 is stopped. Finally, rotate the hollow bolts 901 of the dynamic monitoring assemblies 9 in the positions of the remaining three installation areas S in the tightening direction in turn until the ammeter display 1404 is observed to decrease, and the rotation of the dynamic monitoring assembly 9 is stopped.

[0053] IV. Access to the monitoring line system: First, after the dynamic monitoring assemblies 9 are installed in the positions of the four installation areas S of the support pad 4, the dynamic monitoring assemblies 9 are electrically connected to the branch lines 12, that is, the electrical plug 905 is plugged into the branch connector 13. Then, after the dynamic monitoring assemblies 9 on all support pads 4 are electrically connected to the branch lines 12 in the corresponding positions, the main control machine 15 is turned on, and the single-chip microcomputer 1501 in the main control machine 15 performs multiple initial current parameter test and collection. Each initial current parameter test and collection is only for testing and collecting the initial current on one branch line 12, that is, only for testing and collecting the total current generated by the four pressure-sensitive resistors 9021 on one support pad 4. The obtained initial current parameter information is stored in the ROM memory of the single-chip microcomputer 1501.

[0054] V. Normalization monitoring: The single-chip microcomputer 1501 in the main control machine 15 periodically performs normal current collection on all branch lines 12. Each time the normal current collection is performed, only the circuit in which the branch line 12 is located is turned on, and the obtained normal current is compared with the initial current. If the difference between the normal current and the initial current is greater than the threshold value preset by the system, an alarm information is output.

[0055] Note: When performing initial current parameter test and collection and normal current collection, the single-chip microcomputer 1501 sequentially controls the single I / O output port according to the address order of the I / O output port.

[0056] The above only describes the preferred embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A deep foundation construction dynamic support device, comprising a channel steel piece (2) for supporting a foundation surface layer (1), a channel steel solid part (3) of the channel steel piece (2) is provided with a support base plate (4) on one side, the support base plate (4) is provided with a center hole (401), the support base plate (4) is provided with a hollow anchor rod body (5) inserted into the foundation surface layer (1) in an inclined manner, the hollow anchor rod body (5) is provided with an inclined base plate (6) in contact with the support base plate (4), the hollow anchor rod body (5) is provided with an anchor rod fixing nut (7) in extrusion contact with the inclined base plate (6), characterized in that: the support base plate (4) is provided with a plurality of plug-in areas (S), the plug-in area (S) comprises a set of oppositely arranged edge frame plates (404), the edge frame plate (404) is L-shaped, a plurality of T-shaped frame plates (403) are arranged between a set of edge frame plates (404), the edge frame plates (404) and the T-shaped frame plates (403) of the same plug-in area (S) are all parallel to each other, the edge frame plates (404) and the T-shaped frame plates (403) and the adjacent T-shaped frame plates (403) form outer gaps (405) and inner gaps (406) therebetween; wherein, a plurality of array insertion holes (402) in communication with the inner gaps (406) are formed at the positions of each inner gap (406) of the support base plate (4); one of the inner gaps (406) of each plug-in area (S) is provided with a clamping nut (10) aligned with any one of the array insertion holes (402), and each plug-in area (S) is provided with a dynamic monitoring assembly (9) installed at the positions of the outer gap (405), the clamping nut (10) and the array insertion hole (402); the dynamic monitoring assembly (9) comprises a hollow bolt (901), a pressure-sensitive piece (902) screwed on one side of the hollow bolt (901), and an electrical connector (903) screwed on the other side of the hollow bolt (901), the electrical connectors (903) of a plurality of dynamic monitoring assemblies (9) are connected in parallel through wires (904) to the same electrical plug (905), wherein the pressure-sensitive piece (902) is provided with a pressure-sensitive resistor (9021) in extrusion contact with the channel steel solid part (3) of the channel steel piece (2); the hollow bolt (901) comprises a hexagonal nut (9011), a first threaded rod (9012), and a threaded through slot (9013) penetrating the hexagonal nut (9011) and the first threaded rod (9012), and the first threaded rod (9012) is screwed on the clamping nut (10); the pressure-sensitive piece (902) comprises a second threaded rod (9022) fixedly connected with the pressure-sensitive resistor (9021), and the second threaded rod (9022) is screwed on one side of the threaded through slot (9013); the electrical connector (903) comprises a third threaded rod (9031), and the third threaded rod (9031) is screwed on the other side of the threaded through slot (9013); wherein, the screw thread directions of the second threaded rod (9022) and the third threaded rod (9031) are opposite. ​ ​ ​ ​ ​ ​ ​ ​ The side end of the second threaded rod (9022) is provided with an electric socket (9023), and the electric socket (9023) is internally provided with a first inner electric contact (9024); and the side end face of the second threaded rod (9022) is provided with a first outer electric contact ring (9025). The side end of the third threaded rod (9031) is provided with an electric plug rod (9032), the electric plug rod (9032) is inserted at the position of the electric socket (9023), the front side end of the electric plug rod (9032) is provided with a front end electric contact (9033), and the electric plug rod (9032) is provided with a ring side electric contact ring (9034) matched with the first outer electric contact ring (9025). The dynamic support device further comprises a tester (14), which is provided with a constant voltage source (1401) and an external interface (1402), and a circuit connected between the constant voltage source (1401) and the external interface (1402) is provided with a current meter (1403) and an ammeter display (1404). The dynamic support device further comprises a host computer (15), which is provided with a single-chip microcomputer (1501), a power supply module (1502) and a current detection module (1503) connected with the single-chip microcomputer (1501), and an I / O output end of the single-chip microcomputer (1501) is connected with a bus (11) comprising a plurality of branch lines (12), wherein each branch line (12) is independently connected with one I / O output port of the single-chip microcomputer (1501).

2. The dynamic support device for deep foundation pit construction according to claim 1, characterized in that: The distance between the opposite edges of the clamping nut (10) is h, the diameter of the screw hole of the clamping nut (10) is Da, the opening longitudinal height of the outer gap (405) is Lw, the longitudinal height of the cross section of the inner gap (406) is Ln, and the hole diameter of the array jack (402) is Dc, and Ln>h>Lw>Da>Dc.

3. The dynamic support device for deep foundation pit construction according to claim 1, characterized in that: The pressure sensitive resistor (9021) is inserted at the position of the array jack (402), and the length of the pressure sensitive resistor (9021) is greater than the length of the array jack (402).

4. The dynamic support device for deep foundation pit construction according to claim 1, characterized in that: The current meter (1403) and the ammeter display (1404) are connected through an analog-to-digital conversion module, and when testing, the electric plug (905) is inserted at the position of the external interface (1402).

5. The dynamic support device for deep foundation pit construction according to claim 1, characterized in that: Each branch line (12) is connected with a branch plug-in device (13), and the electric plug (905) is inserted at the position of the branch plug-in device (13).

6. A method for dynamic support of deep foundation pit construction, characterized in that, The dynamic support device for deep foundation pit construction according to any one of claims 1 to 5 comprises the following links: Link one, support installation The channel steel piece (2), the support pad plate (4), the inclined pad plate (6), the hollow anchor rod body (5), and the anchor rod fixing nut (7) are fixedly installed, and the grouting operation of the hollow anchor rod body (5) is completed. Link two, dynamic monitoring component positioning installation On the "upper", "lower", "left" and "right" four plug-in areas (S) of the support pad plate (4), find the array jack (402) blocked by the channel steel solid part (3) on each plug-in area (S), and install the dynamic monitoring component (9) at the position of the array jack (402) blocked by the channel steel solid part (3) closest to the center of the plug-in area (S). Link three, contact degree test and fastening First, plug the electrical plug (905) into the external interface (1402) of the tester (14), turn on the tester (14), and observe the current meter display of the tester (14); Then, rotate the hollow bolt (901) of the dynamic monitoring component (9) at one of the plug-in areas (S) in the tightening direction, and observe the change of the current meter display (1404) of the tester (14) again. If the current meter display (1404) decreases, it means that it has been tightened, and the dynamic monitoring component (9) should be stopped from being tightened further; Finally, rotate the hollow bolts (901) of the dynamic monitoring components (9) at the remaining three plug-in areas (S) in the tightening direction until the current meter display (1404) is observed to decrease, and the dynamic monitoring component (9) is stopped from being tightened further; Link four, access to the monitoring line system First, after the dynamic monitoring components (9) are installed at the four plug-in areas (S) of the support pad plate (4), electrically connect the dynamic monitoring components (9) with the branch lines (12); Then, after the dynamic monitoring components (9) on all support pad plates (4) are electrically connected with the branch lines (12) at the corresponding positions, turn on the main control machine (15), and the single-chip microcomputer (1501) in the main control machine (15) performs multiple initial current parameter test collections. Each initial current parameter test collection only tests and collects the initial current on one branch line (12), and the obtained initial current parameter information is stored in the ROM memory of the single-chip microcomputer (1501); Link five, normal monitoring The single-chip microcomputer (1501) in the main control machine (15) periodically collects normal currents of all branch lines (12). Each time the normal current is collected, only the circuit in which the branch line (12) is located is turned on, and the obtained normal current is compared with the initial current. If the difference between the normal current and the initial current is greater than the threshold value preset by the system, an alarm information is output.

7. The deep foundation pit construction dynamic support method according to claim 6, characterized in that: When performing initial current parameter test collection and normal current collection, the single-chip microcomputer (1501) sequentially controls the single I / O output port according to the address order of the I / O output port.

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