CN220434293U - Size-adjustable tunnel portal protection device - Google Patents

Abstract

The utility model relates to the technical field of constructional engineering, in particular to a size-adjustable tunnel portal protection device. The vertical bars are vertical square steel with the lower ends supported at the outer side of the hole; the side support structure is a side enclosure structure capable of adjusting the length in the transverse direction and the longitudinal direction, and is detachably connected to the vertical rods and forms a side part of the protection device with the vertical rods; the inner side support structure is a lateral and longitudinal length adjustable inner side support structure and is detachably connected to the inner side of the side support structure; the bottom support frame structure is detachably connected to the bottommost side support structure and the inner side support structure. The entrance to a cave protector simple structure of this application, it is very convenient to install and dismantle, can carry out fine adaptability according to the entrance to a cave size and adjust.

Description

Size-adjustable tunnel portal protection device

Technical Field

The utility model relates to the technical field of constructional engineering, in particular to a size-adjustable tunnel portal protection device.

Background

In civil engineering construction, the protection of high altitude construction entrance to a cave generally adopts customization rail or steel pipe scaffold to enclose the vertical direction around the entrance to a cave to adopt steel pipe etc. as main atress structure upper berth plank or pocket net to carry out horizontal protection, so as to prevent when working near the hole personnel fall or the high altitude weight causes the injury to entrance to a cave below and surrounding on-site personnel, guarantee on-site personnel's safety.

When the customized fence is adopted around the hole, the fence is easy to deform or shift after being impacted by certain external force due to the fact that the special lining structure is not used, and the stability is poor. When adopting steel pipe scaffold around the entrance to a cave, there are the connecting rod piece more, set up and dismantle time long, bottom baseboard and member are not connected in advance and are unified whole, need the scene to adopt steel wire etc. to fix, and fixed quality is generally relatively poor. The horizontal protection adopts the upper plank to lay at will, and is fixed insecure scheduling problem, has when adopting the horizontal pocket net and does not have fixed reliable connection with vertical protection rail or steel pipe and need to adopt ribbon or iron wire to fix. When the two modes are adopted to protect the tunnel portal, no special fixed material is generally adopted, the tunnel portal is installed by temporarily adjusting the tunnel portal from the site turnover material, the form is not uniform, and the site safety civilized construction quality is poor.

In order to solve the technical problems, the utility model of China with the patent number of CN217577981U and named as an air entrainment block anti-falling hanging fence provides a hanging fence structure, wherein the air entrainment block anti-falling hanging fence comprises a protection frame and hanging rings, the protection frame comprises upright posts, transverse connecting rods and longitudinal connecting rods connected between the upright posts, and the length of at least one of the transverse connecting rods and the longitudinal connecting rods can be adjusted; the lifting ring is a closed long ring and comprises vertical sections welded with each transverse or longitudinal connecting rod on the side surface of the lifting ring and U-shaped sections connected to the two ends, the top of the lifting ring and the protective frame form lifting holes for a steel wire rope or a lifting hook to pass through, the bottom of the lifting ring and the protective frame form bearing rod perforation for a bearing rod for supporting an air-adding block clamping support to pass through, the lifting ring is arranged on two opposite side surfaces of the protective frame in pairs, and at least two pairs of lifting rings are arranged along the side surfaces at intervals. The hanger can be adjusted in size by adjusting the length of at least one of the transverse and longitudinal connecting rods. However, the adjustment of the hanger structure is only the adjustment of the lengths of the transverse connecting rod and the longitudinal connecting rod, and in a strict sense, the adjustment mode can only be used for adjusting the cross section area of the hanger, but for the guardrail structure, the whole guardrail is not only composed of the transverse connecting rod and the longitudinal connecting rod, and the protection supporting structure related to the inner side of the guardrail also needs to be correspondingly adjusted, but the hanger structure is not described. In addition, the hanger structure involves a plurality of welding connections, which are unfavorable for the subsequent disassembly and rotation.

Disclosure of Invention

The utility model aims to solve the defects of the background technology and provide an adjustable-size tunnel portal protection device.

The technical scheme of the utility model is as follows: an adjustable-size opening protection device comprises,

the vertical rods are arranged at intervals along the circumferential direction of the hole, and the lower ends of the vertical rods are vertical square steel supported at the outer side of the hole;

the side support structure is a side enclosure structure capable of adjusting the length in the transverse direction and the longitudinal direction, and is detachably connected to the vertical rods and forms a side part of the protection device with the vertical rods;

an inner support structure, which is an inner support structure with adjustable transverse and longitudinal length, and is detachably connected to the inner side of the side support structure;

and the bottom supporting frame structure is detachably connected to the bottommost side supporting structure and the inner side supporting structure.

According to the size-adjustable tunnel portal protection device provided by the application, the side support structure comprises a plurality of side support rods; the side support rods comprise side end angle steel and side middle angle steel; a plurality of side through holes which are arranged at intervals along the length direction are uniformly formed in the side middle angle steel and the side end angle steel; the two ends of the side face middle angle steel are respectively overlapped with the side face end angle steel parts on the two sides, and are connected into a whole through a side face screw rod penetrating through the overlapped side face through hole.

According to the size-adjustable tunnel portal protection device provided by the application, the side support structure comprises a plurality of side support layers which are arranged at intervals vertically, and each side support layer comprises two side support rods which are arranged horizontally and transversely and two side support rods which are arranged horizontally and longitudinally.

According to the size-adjustable tunnel portal protection device provided by the application, the inner side support structure comprises a plurality of inner side support layers which are vertically arranged at intervals; the inner side supporting layers are in one-to-one correspondence with the side supporting layers, and the transverse ends and the longitudinal ends of the inner side supporting layers are connected to the side supporting layers with the same height.

According to the size-adjustable tunnel portal protection device provided by the application, the inner support layer comprises a plurality of inner support rods which are arranged along the longitudinal direction and a plurality of inner support rods which are arranged along the transverse direction; the inner support rod comprises an inner middle angle steel and an inner end angle steel; a plurality of inner through holes which are arranged at intervals along the length direction are uniformly formed in the inner middle angle steel and the inner end angle steel; the two ends of the inner middle angle steel are respectively overlapped with the inner end angle steel parts on the two sides and are connected into a whole through an inner screw rod penetrating through the overlapped inner through hole.

According to the size-adjustable tunnel portal protection device provided by the application, the inner side supporting layer further comprises a plurality of inclined supporting rods which are horizontally and obliquely arranged; the diagonal support bar comprises a pair of support bars,

one end of the inclined end sleeve is connected to the side support rod on the same layer by a bolt, and the other end of the inclined end sleeve is provided with an internal thread;

the two ends of the inclined middle sleeve are provided with internal threads;

one end of the connecting screw rod is connected to the end parts of the inclined end sleeve and the inclined middle sleeve through an internal thread telescopic screw;

the other end of the connecting screw is provided with a steel plate; screw holes are formed in the steel plates, and the steel plates at the end parts of adjacent connecting screws are fixedly connected into a whole through bolts.

According to the adjustable-size tunnel portal protection device provided by the application, the side support structure further comprises corner connecting pieces; the corner connecting piece is an L-shaped angle steel arranged at the joint of the adjacent side support rods on the same layer, and the corner connecting piece is fixedly connected with the two adjacent side support rods through bolts.

According to the size-adjustable tunnel portal protection device, the side support rods at the bottommost layer are provided with the plurality of vertical screws at intervals along the length direction of the side support rods; a bottom plate is arranged at the lower end of the vertical rod; the bottom plate is provided with screw holes; the vertical screw rod passes through a screw hole on the bottom plate and is fixedly connected with the bottom plate through a bolt structure.

According to an adjustable size tunnel portal protection device provided herein, the bottom support structure includes a mesh or sheet of steel laid on the bottommost inner support layer.

The application has the advantages that: 1. the lateral support structure and the inner support structure can be adjusted transversely and longitudinally, and the corresponding adjustment can be carried out according to the size of the opening to be installed, so that the formed protection device can completely adapt to the size specification of the opening, the whole protection device is simple in structure, convenient to adjust and use, and extremely easy to install and detach, and has great popularization value;

2. the side support structure is extremely simple, the side support rod can be adjusted along the length direction through the combined structure of the side end angle steel and the side middle angle steel, the adjusting mode is simple, the adjustment along the length direction can be realized through the side middle angle steel in the middle of expansion and contraction, and the side support structure is extremely convenient;

3. the side support structure is provided with a plurality of layers, adjacent side support structures are vertically arranged at intervals, the side support structures and the vertical rods can form a stable side protection structure, the multi-layer side support structure is simple to install, the formed hole maintenance structure is stable and firm, and the whole structure is extremely convenient to install and detach;

4. the inner side supporting structure comprises the inner side supporting layers, the inner side supporting layers can be in one-to-one correspondence with the side supporting layers, the inner side supporting layers can be arranged on the bottommost layer and the uppermost layer according to actual requirements, and the inner side supporting layers and the side supporting layers form a stable supporting structure, so that the structural stability and the firmness of the whole protecting device are greatly improved;

5. the inner support layer comprises the inner support rod, the inner support rod adopts a structure like a side support rod, the inner middle angle steel and the inner end angle steel which are sleeved with each other are utilized for connection, the length of the inner support rod can be conveniently and rapidly adjusted, the adjustment mode is simple, and the installation and the disassembly are easy;

6. the inner side supporting layer further comprises an inclined supporting rod, the inclined supporting rod is connected with the adjacent inclined end sleeve and the inclined middle sleeve through the connecting screw, the connecting screw is in spiral connection with the inclined end sleeve and the inclined middle sleeve, continuous length adjustment can be performed, the adjusting mode is simple, and the installation and the disassembly are convenient;

7. the side support structure further comprises corner connecting pieces, wherein the corner connecting pieces are structures for connecting adjacent side support rods, the side support rods on the same layer can be connected into a whole at the corners through the corner connecting pieces, so that a stable and firm side enclosure structure is formed, the installation is simple, and the disassembly is convenient;

8. according to the vertical screw rod fixing device, the plurality of vertical screws are arranged on the side support rod of the bottommost layer, and the plurality of vertical screws are equidistantly arranged at intervals along the length direction, so that the interval length of the adjacent vertical rods can be adjusted according to actual requirements, the vertical rods can be stably fixed on the side support rod of the bottommost layer, the installation and adjustment modes are relatively simple, and the applicability is good;

9. the bottom support structure of this application is very simple, can realize the bottom protection to the entrance to a cave through the pocket net and sheet steel, and it is all very convenient that its installation of no matter is pocket net or sheet steel and dismantles.

The entrance to a cave protector simple structure of this application, it is very convenient to install and dismantle, can carry out fine adaptability according to the entrance to a cave size and adjust, can be applicable to the entrance to a cave protection of various different specification sizes, has very big spreading value.

Drawings

Fig. 1: the protective device structure of the application is schematic (overlook view);

fig. 2: corner position schematic of the guard of the present application;

fig. 3: the connection structure of adjacent connecting screws is schematically shown in the application;

fig. 4: view a-a in fig. 1 of the present application;

fig. 5: view B-B in fig. 1 of the present application;

wherein: 1-a vertical rod; 2-side end angle steel; 3-side middle angle steel; 4-inner middle angle steel; 5-inner end angle steel; 6-oblique end sleeve; 7-oblique middle sleeve; 8-connecting a screw; 9-corner connectors; 10-a vertical screw; 11-a bottom plate.

Detailed Description

Embodiments of the present utility model are described in detail below, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

The utility model will now be described in further detail with reference to the drawings and to specific examples.

The application relates to an adjustable size's entrance to a cave protector, mainly used prevents constructor or object from dropping inside the entrance to a cave to the protection of entrance to a cave. The opening protecting device constructed by the method can be used for adjusting the size, and can be used for rapidly adjusting the transverse size and the longitudinal size, so that the opening protecting device is suitable for the opening size specification. The entrance to a cave protector application scope of this application is very extensive, and whole dismantlement installation is also very convenient.

Specifically, as shown in fig. 1 to 5, the size-adjustable tunnel portal protection device comprises a plurality of vertical rods 1, a side support structure, an inner support structure and a bottom support structure, wherein the plurality of vertical rods 1 are circumferentially arranged at intervals along the tunnel portal, the lower ends of the vertical rods 1 are vertical square steel supported at the outer side of the tunnel portal, the vertical rods 1 are vertical support structures, and the plurality of vertical rods 1 surround the tunnel portal to form a vertical support structure of the whole protection device; the side support structure is a side enclosure structure capable of adjusting the length in the transverse direction and the longitudinal direction, and is detachably connected to the vertical rod 1 and forms a side part of the protection device with the vertical rod 1; the inner side support structure is a lateral and longitudinal length adjustable inner side support structure and is detachably connected to the inner side of the side support structure; the bottom support frame structure is detachably connected to the bottommost side support structure and the inner side support structure.

The bottom sprag structure, inboard bearing structure, side bearing structure and montant of this application form whole entrance to a cave protective structure jointly, and its simple structure, inboard bearing structure, side bearing structure can carry out corresponding regulation according to the entrance to a cave size, can adapt to the entrance to a cave protection of various dimension specifications.

In some embodiments of the present application, the above side supporting structure is optimized in this embodiment, and specifically, as shown in fig. 1, 4 and 5, the side supporting structure of the present application includes multiple side supporting layers arranged at intervals vertically, each side supporting layer includes four side supporting rods, and each side supporting layer includes two side supporting rods arranged horizontally and laterally and two side supporting rods arranged horizontally and longitudinally.

As shown in fig. 1, 4 and 5, the side support rod comprises side end angle steel 2 and side middle angle steel 3, wherein a plurality of side through holes which are arranged at intervals along the length direction are uniformly formed in the side middle angle steel 3 and the side end angle steel 2, and two ends of the side middle angle steel 3 are respectively overlapped with the side end angle steel 2 on two sides in a part and are connected into a whole through side screws penetrating through the overlapped side through holes.

The side face middle angle steel 3 and the side face end angle steel 2 are provided with overlapping parts in the length direction, the length of the side face supporting rods can be changed by changing the length of the overlapping parts, each side face supporting rod comprises two side face end angle steels 2 and one side face middle angle steel 3, the side face middle angle steel 3 is positioned between the two side face end angle steels 2 on two sides, the overlapping lengths of the two side face end angle steels 2 and the side face middle angle steel 3 are adjusted, then the side face screw rod is used for penetrating through the overlapping side face through holes, and the side face end angle steels 2 and the side face middle angle steels 3 can be fixedly connected into a whole to form the side face supporting rod with the required length.

Four side bracing pieces head and tail connections form square frame construction, carry out fixed connection through turning connecting piece 9 between the adjacent side bracing piece, as shown in fig. 1 and 2, turning connecting piece 9 is the L type angle steel that sets up in the adjacent side bracing piece junction of same floor, turning connecting piece 9 pass through the bolt respectively with two adjacent side bracing pieces fixed connection.

In addition, for the arrangement of the side supporting structures, the embodiment has a targeted design, namely, the side supporting rod at the bottommost layer is positioned at the outer side of the vertical rod 1 far away from the hole, and the side supporting rods at other layers are positioned at the inner side of the vertical rod 1 facing the hole. The side support bars of other layers are fixed on the vertical bars through horizontal bolts except the side support bar of the bottommost layer.

As shown in fig. 4 and 5, in this embodiment, a notch for accommodating the vertical rod 1 is formed in the side end angle steel 2 of the side support rod except for the bottommost layer, a plurality of through holes are formed in the vertical rod 1 and are arranged at intervals vertically, during installation, the vertical rod 1 is inserted into the notch, so that the through holes in the vertical rod 1 correspond to the through holes in the side end angle steel 2, and then the through holes are connected into a whole through bolts penetrating through the through holes.

For the connection mode of the side support bar at the bottommost layer and the vertical bar 1, as shown in fig. 1, 2, 4 and 5, a plurality of vertical screws 10 are arranged on the side support bar at the bottommost layer along the length direction of the side support bar at intervals, the lower end of the vertical bar 1 is provided with a bottom plate 11, screw holes are formed in the bottom plate 11, and the vertical screws 10 penetrate through the screw holes in the bottom plate 11 and are fixedly connected with the bottom plate 11 through a bolt structure.

According to the embodiment, the vertical screw rod 10 is arranged on the side support rod of the bottommost layer (comprising the side end angle steel 2 of the bottommost layer and the side middle angle steel 3 of the bottommost layer), so that the bottom plate 11 is conveniently and quickly connected with the side support rod, meanwhile, the contact area between the vertical rod 1 and the side support rod can be increased by the bottom plate 11, and the stability of the vertical rod 1 is improved.

In other embodiments of the present application, the above-mentioned inner support structure is optimized in this embodiment, and specifically, as shown in fig. 1, the inner support structure includes multiple layers of inner support layers arranged at intervals vertically, where the inner support layers are in one-to-one correspondence with the side support layers, and two ends of the inner support layers in a transverse direction and two ends of the inner support layers in a longitudinal direction are connected to the side support layers with equal heights.

The inner side supporting structure and the side supporting structure are arranged in the same layer, so that a horizontal supporting structure of the whole protecting device is formed together, and a good stable protecting device structure can be formed by matching the vertical rods 1. The inner side supporting structure can be arranged without each layer, the inner side supporting layer can be arranged at the bottommost layer and the topmost layer, other layers can be arranged without being arranged, and the inner side supporting layers in the two layers can also play a good supporting effect.

As shown in fig. 1, the inner supporting layer of this embodiment includes a plurality of inner supporting rods arranged longitudinally and a plurality of inner supporting rods arranged transversely, the inner supporting rods include an inner middle angle steel 4 and an inner end angle steel 5, a plurality of inner through holes arranged at intervals along the length direction are uniformly formed in the inner middle angle steel 4 and the inner end angle steel 5, and two ends of the inner middle angle steel 4 are respectively overlapped with the inner end angle steel 5 on two sides partially and are connected into a whole through inner screws penetrating through the overlapped inner through holes.

The structure of the inner side supporting rod is similar to that of the side supporting rod, the inner side supporting rod and the side supporting rod can be practically used by adopting the same unit rod, the inner side supporting rod and the side supporting rod can be commonly used in practical use, and different functions are generated by different installation positions.

The inner end angle steel 5 at two ends of the inner support rod is fixedly connected with the side end angle steel 2 of the side support rod at two sides through a bolt structure, in this embodiment, as shown in fig. 1, the inner support rod is arranged at the bottommost layer, and the inner end angle steel 5 of the rod piece longitudinally arranged in the inner support rod is fixedly connected with the side end angle steel 2 of the side support rod at the bottommost layer through a bolt.

In addition, the inner support layer of the embodiment further comprises a plurality of inclined support rods which are horizontally and obliquely arranged, as shown in fig. 1 and 3, each inclined support rod comprises an inclined end sleeve 6, an inclined middle sleeve 7 and a connecting screw rod 8, one end of each inclined end sleeve 6 is connected to the side support rod on the same layer through bolts, and the other end of each inclined end sleeve 6 is provided with internal threads; internal threads are formed at two ends of the inclined middle sleeve 7; one end of the connecting screw rod 8 is connected to the ends of the inclined end sleeve 6 and the inclined middle sleeve 7 through telescopic screws with internal threads, a steel plate is arranged at the other end of the connecting screw rod 8, screw holes are formed in the steel plate, and the steel plates at the ends of the adjacent connecting screw rods 8 are fixedly connected into a whole through bolts.

One end of the inclined end sleeve 6 is welded with a steel plate structure, the steel plate structure is fixedly connected with the side end angle steel 2 of the side support rod through a bolt structure, and the inner side of the other end of the inclined end sleeve 6 is tapped to form an inner thread structure. One end of the connecting screw rod 8 is spirally connected in the inclined end sleeve 6 through an internal thread structure, and the length of the connecting screw rod 8 extending into the inclined end sleeve 6 can be changed through rotation adjustment. The two ends of the inclined middle sleeve 7 are respectively provided with an internal thread structure, and the two ends are respectively connected with a connecting screw rod 8 in a spiral way. The end parts of the connecting screw rods 8 are provided with steel plates, the steel plates of two adjacent connecting screw rods 8 are mutually attached, and then are connected into a whole through bolts penetrating through the steel plates.

The length of the diagonal support rod is adjusted by screwing in the connecting screw rod 8, and the adjustment mode is simple, continuously adjustable and better in adaptability. In this embodiment, an oblique support bar is disposed between the side support bar at the bottommost layer and the side support bar at the topmost layer, and each layer includes two oblique support bars that are horizontally crossed.

In a preferred embodiment of the present application, the bottom support structure of the present embodiment comprises a mesh or sheet of steel laid over the innermost inner support layer. In the case of the net, the periphery of the net can be fixedly connected with the corner connecting pieces 9 at the bottommost layer, and in the case of the steel sheet, the net can be fixedly connected with the side support rods, the inner support rods and the inclined support rods at the bottommost layer through bolt structures.

The sheet steel may be provided as a plurality of unitary sheet steel panels, i.e., a multi-segment structure, with adjacent sheet steel panels being partially overlapped and the plurality of unitary sheet steel panels being positioned in a partially overlapping manner to form a bottom support structure adapted to the opening area.

When the device is actually installed, the size of the opening is confirmed, the length of the side support rod, the length of the inner support rod and the length of the inclined support rod are determined according to the size of the opening, and the specific length is adjusted and installed for adjustment; corner connecting pieces 9 are arranged between the side support rods at the bottommost layer, so that the side support rods at the bottommost layer are tightly attached to the hole surface; an inner side support rod and an inclined support rod are arranged between the side support rods of the bottommost layer; after the installation and fixation of the vertical rods 1 are completed based on the side support rods at the bottommost layer, the side support rods, the inner side support rods and the inclined support rods at other layers are installed and fixed by using through holes on the vertical rods 1, and the side support rods at each layer are installed and fixed by corner connecting pieces 9; the end part of the oblique support rod is fixedly connected with the side support rod; the side support rods, the inner support rods and the inclined support rods at the bottommost layer are provided with the stomachers or/and the thin steel plates to form a bottom support structure, so that the whole opening protecting device is installed.

When the device is removed, the device can be removed according to the reverse direction of the process, so that the device is convenient for subsequent repeated use.

As shown in fig. 1, the lateral direction of the present application refers to the left-right direction in fig. 1, the longitudinal direction refers to the up-down direction in fig. 1, and the vertical direction refers to the direction perpendicular to fig. 1.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (9)

1. An adjustable size's entrance to a cave protector, its characterized in that: comprising the steps of (a) a step of,

the vertical rods (1) are arranged at intervals along the circumferential direction of the hole, and the vertical rods (1) are vertical square steel with the lower ends supported at the outer side of the hole;

the side support structure is a side enclosure structure capable of adjusting the length in the transverse direction and the longitudinal direction, is detachably connected to the vertical rod (1) and forms a side part of the protection device with the vertical rod (1);

an inner support structure, which is an inner support structure with adjustable transverse and longitudinal length, and is detachably connected to the inner side of the side support structure;

and the bottom supporting structure is detachably connected to the bottommost side supporting structure and the inner side supporting structure.

2. The adjustable size opening protection device of claim 1, wherein: the side support structure comprises a plurality of side support bars; the side support rod comprises side end angle steel (2) and side middle angle steel (3); a plurality of side through holes which are arranged at intervals along the length direction are uniformly formed in the side middle angle steel (3) and the side end angle steel (2); the two ends of the side face middle angle steel (3) are respectively overlapped with the side face end angle steel (2) at the two sides, and are connected into a whole through side face screws penetrating through the overlapped side face through holes.

3. An adjustable size opening guard according to claim 2, wherein: the side support structure comprises a plurality of side support layers which are arranged at intervals along the vertical direction, and each side support layer comprises two side support rods which are arranged along the horizontal transverse direction and two side support rods which are arranged along the horizontal longitudinal direction.

4. A size adjustable threshold guard according to claim 3, wherein: the inner support structure comprises a plurality of inner support layers which are vertically arranged at intervals; the inner side supporting layers are in one-to-one correspondence with the side supporting layers, and the transverse ends and the longitudinal ends of the inner side supporting layers are connected to the side supporting layers with the same height.

5. The adjustable size opening guard of claim 4, wherein: the inner support layer comprises a plurality of inner support rods arranged along the longitudinal direction and a plurality of inner support rods arranged along the transverse direction; the inner support rod comprises an inner middle angle steel (4) and an inner end angle steel (5); a plurality of inner through holes which are arranged at intervals along the length direction are uniformly formed in the inner middle angle steel (4) and the inner end angle steel (5); the two ends of the inner middle angle steel (4) are respectively overlapped with the inner end angle steel (5) at the two sides, and are connected into a whole through an inner screw rod penetrating through the overlapped inner through hole.

6. The adjustable size opening guard of claim 4, wherein: the inner support layer also comprises a plurality of oblique support rods which are horizontally and obliquely arranged; the diagonal support bar comprises a pair of support bars,

one end of the inclined end sleeve (6) is connected to the side support rod on the same layer by a bolt, and the other end of the inclined end sleeve (6) is provided with an internal thread;

the two ends of the inclined middle sleeve (7) are provided with internal threads;

one end of the connecting screw rod (8) is connected with the ends of the inclined end sleeve (6) and the inclined middle sleeve (7) through an internal thread telescopic screw;

the other end of the connecting screw rod (8) is provided with a steel plate; screw holes are formed in the steel plates, and the steel plates at the end parts of the adjacent connecting screws (8) are fixedly connected into a whole through bolts.

7. An adjustable size opening guard according to claim 2, wherein: the side support structure further comprises corner connectors (9); the corner connecting piece (9) is an L-shaped angle steel arranged at the joint of the adjacent side support rods on the same layer, and the corner connecting piece (9) is fixedly connected with the two adjacent side support rods through bolts.

8. An adjustable size opening guard according to claim 2, wherein: a plurality of vertical screws (10) are arranged on the side support rods at the bottommost layer at intervals along the length direction of the side support rods; the lower end of the vertical rod (1) is provided with a bottom plate (11); screw holes are formed in the bottom plate (11); the vertical screw rod (10) passes through a screw hole on the bottom plate (11) and is fixedly connected with the bottom plate (11) through a bolt structure.

9. An adjustable size opening guard according to claim 2, wherein: the bottom support structure includes a mesh or sheet of steel laid over the bottommost inner support layer.