Underground excavation primary support device closely attached to and under penetrating existing structure

Abstract

The utility model provides an underground excavation primary support device for a closely-attached underneath-penetrating existing structure, which comprises a bottom support, and the two ends of the bottom support are connected with a lower support; the other end of the lower support is connected with the lower end of the upper support; a plurality of lower reinforcing plates are uniformly arranged at the upper part of the upper support; the upper end part of the upper support is connected with the lower part of the jack; a top support is arranged at the upper end of the jack; a plurality of upper reinforcing plates are uniformly arranged at two ends of the top support; the bottom support, the lower support and the upper support are connected through connecting plates, and penetrating holes are symmetrically formed in the connecting plates. After the bolts penetrate through the penetrating holes, the nuts are screwed on the bolts, and the connected connecting plates are fixed. The primary supporting device is installed through splicing, and transportation and installation are convenient. The primary supporting device can effectively support the excavation space and ensure the safety of the excavation space; according to settlement monitoring data of the existing structure, the primary supporting device can control settlement of the existing structure through jacking of the jack, and safe use of the existing structure is ensured.

Description

Technical Field

[0001] The utility model relates to a support device, in particular to an initial support device for supporting soil excavation when closely spaced and mined-under existing structures Background Technique

[0002] When constructing an underground tunnel or an underground structure, due to the limitations of the construction environment, it is necessary to closely space and mine-under an existing structure under the existing structure. When constructing processes such as earth excavation and initial support are carried out under the existing structure, the settlement of the existing structure may be caused, thereby affecting the use of the existing structure or the operation of the equipment inside the existing structure. Therefore, when closely spaced and mined-under existing structures, the settlement of the existing structure should be strictly controlled. However, during the actual mined-under construction process, due to reasons such as unclear geological conditions, too fast soil excavation, and changes in the earth pressure distribution after excavation, the settlement of the existing structure is caused, affecting the safety of the use of the existing structure and also affecting the construction safety of closely spaced and mined-under existing structures. Summary of the Invention

[0003] The purpose of the utility model is to provide an initial support device for closely spaced and mined-under existing structures to solve the above problems. The initial support device is installed by splicing, which is convenient for transportation and installation. The initial support device can effectively support the excavation space and serve as the initial support of the structure to ensure the safety of the excavation space. According to the settlement monitoring data of the existing structure, the initial support device can control the settlement of the existing structure through the jacking of the jack to ensure the safe use of the existing structure.

[0004] The utility model mainly realizes the above purpose through the following technical solutions:

[0005] An initial support device for closely spaced and mined-under existing structures, which is mainly characterized in that: it includes a bottom support, and both ends of the bottom support are connected to the lower support; the other end of the lower support is connected to the lower end of the upper support; a plurality of lower reinforcing plates are evenly arranged on the upper part of the upper support, and the upper end of the upper support is connected to the lower part of the jack; the upper end of the jack is provided with a top support, and a plurality of upper reinforcing plates are evenly arranged at both ends of the top support; the bottom support, the lower support and the upper support are connected by a connecting plate, and through holes are symmetrically arranged on the connecting plate; after the bolt passes through the through hole, the nut is screwed onto the bolt to fix the connected connecting plates.

[0006] Preferably, the bottom support, the top support, the upper support and the lower support are made of I-beams or H-beams.

[0007] The utility model has at least the following advantages or beneficial effects:

[0008] The present utility model provides a closely-fitting undercrossing existing structure excavation primary support device. The primary support device is installed by splicing, which is convenient for transportation and installation. The primary support device can effectively support the excavation space and serve as the initial support of the structure to ensure the safety of the excavation space. According to the settlement monitoring data of the existing structure, the primary support device can control the settlement of the existing structure through the jacking of the jacks to ensure the safe use of the existing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions of the present utility model, the drawings required for the present utility model will be briefly introduced below. It should be understood that the following drawings should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0010] Figure 1 is the front view of the closely-fitting undercrossing existing structure excavation primary support device;

[0011] Figure 2 is the side view of the closely-fitting undercrossing existing structure excavation primary support device;

[0012] Figure 3 is the top view of the closely-fitting undercrossing existing structure excavation primary support device;

[0013] Figure 4 is the usage state diagram of the closely-fitting undercrossing existing structure excavation primary support device.

[0014] Reference numerals: 1 - bottom support; 2 - lower support; 3 - upper support; 31 - lower reinforcement plate; 4 - jack; 5 - top support; 51 - upper reinforcement plate; 6 - connecting plate; 61 - perforation; 7 - bolt; 71 - nut; A - existing structure; B - primary support device without jack. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] To make the objectives, technical solutions, and advantages of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings of the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model.

[0016] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of the present utility model.

[0017] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0018] In the description of the embodiments of the present invention, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed in this invention, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0019] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "linked" are understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a welded connection, etc.; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Specific embodiments

[0020] Please refer to Figures 1 to 3 the structural schematic diagram of the close-fitting undercrossing existing structure excavation primary support device shown in Figure 4 the usage state diagram of the close-fitting undercrossing existing structure excavation primary support device shown in, where the existing structure (A) and the primary support device without jacks (B) are not included in the present invention.

[0021] A close-fitting undercrossing existing structure excavation primary support device, which is mainly characterized in that it includes a bottom support (1), both ends of the bottom support (1) are connected to a lower support (2); the other end of the lower support (2) is connected to the lower end of an upper support (3); a plurality of lower reinforcing plates (31) are evenly arranged on the upper part of the upper support (3), and the upper end of the upper support (3) is connected to the lower part of a jack (4); the upper end of the jack (4) is provided with a top support (5), and a plurality of upper reinforcing plates (51) are evenly arranged at both ends of the top support (5); the bottom support (1), the lower support (2) and the upper support (3) are connected by a connecting plate (6), and through holes (61) are symmetrically arranged on the connecting plate (6); after a bolt (7) passes through the through hole (61), a nut (71) is screwed onto the bolt (7) to fix the connected connecting plates (6).

[0022] It should be noted that: The initial support device is applied to closely spaced mined tunneling under the existing structure (A). After the installation of the initial support device is completed, the top support (5) should be in close contact with the lower part of the existing structure (A) to ensure that the jack (4) jacks up the existing structure (A) through the top support (5).

[0023] Before fabricating the shown initial support device, the number of the installed initial support devices should be determined according to the geological conditions of the existing structure (A), the self-weight of the existing structure (A), the jacking parameters of the jack (4), etc. Generally speaking, as Figure 4 shown, the initial support devices and the initial support devices without jacks (B) should be arranged at intervals.

[0024] As the soil is excavated, install the initial support device or the initial support device without jacks (B) in a timely manner.

[0025] When installing the initial support device, first install the bottom support (1), and then install the lower supports (2) on both sides. Connect the connecting plate (6) of the bottom support (1) with the connecting plate (6) of the lower support (2) so that the corresponding through holes (61) coincide. After passing the bolts (7) through the through holes (61) in sequence, screw the nuts (71) into the bolts (7) to fix the connection between the bottom support (1) and the lower support (2).

[0026] Then install the upper supports (3) on both sides. Connect the connecting plate (6) of the upper support (3) with the connecting plate (6) of the lower support (2) so that the corresponding through holes (61) coincide. After passing the bolts (7) through the through holes (61) in sequence, screw the nuts (71) into the bolts (7) to fix the connection between the upper support (3) and the lower support (2).

[0027] After the installation of the upper support (3) is completed, install the jack (4) at the upper end of the upper support (2). The jack (4) can be fixed to the upper end of the upper support (3) by welding.

[0028] Finally, install the top support (5). The top support (5) can be fixedly connected to the upper end of the jack (4) by welding, and then level the top support (5) through the jack (4).

[0029] After the installation of the initial support device is completed, synchronously jack up the top support (5) through the jack (4) to make the top support (5) closely contact with the lower part of the existing structure (A).

[0030] According to the settlement monitoring of the existing structure (A), synchronously jack up through the jack (4) in a timely manner to adjust the elevation of the top support (5), control the settlement of the existing structure (A), and ensure that the settlement of the existing structure (A) meets the requirements.

[0031] Then, according to the construction plan, timely carry out subsequent processes such as shotcreting with wire mesh for the initial support.

[0032] The above are only the preferred embodiments of the invention of the present utility model and are not intended to limit the invention of the present utility model. For those skilled in the art, various modifications and changes can be made to the invention of the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the invention of the present utility model shall be included within the protection scope of the invention of the present utility model.

Claims

1. A closely-fitting initial support device for mined tunneling under an existing structure, and its main characteristics are as follows: It includes a bottom support (1), both ends of the bottom support (1) are connected to a lower support (2); the other end of the lower support (2) is connected to the lower end of an upper support (3); several lower reinforcement plates (31) are evenly arranged on the upper part of the upper support (3), and the upper end of the upper support (3) is connected to the lower part of a jack (4); the upper end of the jack (4) is provided with a top support (5), and several upper reinforcement plates (51) are evenly arranged at both ends of the top support (5); the bottom support (1), the lower support (2) and the upper support (3) are connected by a connecting plate (6), and perforations (61) are symmetrically arranged on the connecting plate (6); after a bolt (7) passes through the perforation (61), a nut (71) is screwed onto the bolt (7) to fix the connected connecting plate (6).

2. The closely-fitting initial support device for mined tunneling under an existing structure according to claim 1, wherein: The bottom support (1), the top support (5), the upper support (3) and the lower support (2) are made of I-beams or H-beams.

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