Underground foundation pit deep foundation pit support safety protection device and construction technology

Abstract

The invention relates to the technical field of foundation pit construction, in particular to an underground foundation pit deep foundation pit supporting safety protection device and a construction technology, the underground foundation pit deep foundation pit supporting safety protection device comprises a supporting steel plate, the supporting steel plate is tightly attached to the inner side wall of a foundation pit body, the supporting steel plate is fixed through a fixing anchor rod, and corner steel columns are erected at the corner positions of the foundation pit body; the supporting and protecting work of the foundation pit body is mainly achieved through the arranged supporting steel plates, and on the basis that the supporting steel plates conduct supporting and protecting, building of the supporting steel plates is reinforced through the arranged supporting and protecting auxiliary mechanisms; the contact tightness between the adjacent supporting steel plates is improved through the cooperative use of the supporting bone rods, the positioning clamping plates and the positioning clamping grooves; in addition, the arranged supporting bone rods are used in cooperation with the auxiliary assemblies, an auxiliary supporting effect is provided for the supporting steel plates, and therefore the supporting and protecting effect on the foundation pit body is improved.

Description

Technical Field

[0001] This invention relates to the field of foundation pit construction technology, and in particular to a safety protection device and construction process for deep foundation pit support. Background Technology

[0002] After the foundation pit is excavated, the soil on the side wall of the foundation pit will naturally collapse into the foundation pit. Therefore, it is necessary to use support steel plates (steel sheet piles) to solidify the side wall of the foundation pit. In order to further improve the strength of the support steel plates, reinforcement structures are generally adopted.

[0003] A Chinese patent document with publication number CN219118180U discloses a seepage-proof support structure fixing device for underground construction. The device includes a support steel plate wall installed on the sidewall of the foundation pit. A retaining strip is welded to the upper part of the support steel plate wall. Several support rods are welded between the retaining strips of adjacent support steel plate walls. A support column is installed at the lower end of the middle of each support rod, and the support column is a cement pile perpendicular to the foundation pit surface. The mutual support between adjacent support steel plate walls prevents the pressure from the support steel plate walls into the foundation pit from being directed to the foundation surface, reducing the possibility of damage to the foundation surface. The support rods use vertical cement piles for support, which does not hinder workers' construction on the foundation surface.

[0004] The above-mentioned scheme for the protection construction of the foundation pit, in order to improve the support strength of the supporting steel plate wall for the foundation pit sidewall, uses a combination of retaining strips and support rods to improve its protective stability. However, the support rods and retaining strips are fixedly connected by welded plates, which has poor disassembly capability. That is, when it is necessary to remove the foundation pit support device, the support rods are generally cut off by a cutting device. On the other hand, for the supporting steel plate wall on the sidewall of a large foundation pit, it is generally formed by splicing multiple supporting steel plates. However, the connection strength between adjacent supporting steel plates also needs to be further improved to meet its support requirements.

[0005] Therefore, this invention proposes a safety protection device and construction process for deep foundation pit support in underground foundation pits to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a safety protection device and construction process for deep foundation pit support in underground foundation pits, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a safety protection device for deep foundation pit support, comprising a supporting steel plate, wherein the supporting steel plate is tightly attached to the inner wall of the foundation pit body and is fixed by a fixed anchor rod, and corner steel columns are erected at the corners of the foundation pit body; The supporting steel plate is symmetrically provided with positioning slots, and a supporting and protective auxiliary mechanism is provided on the supporting steel plate to provide stable support for the supporting steel plate.

[0008] Preferably, the support and protection auxiliary mechanism includes a support rod and an auxiliary component. Connecting plate seats are symmetrically fixed at both ends of the support rod. The connecting plate seats are provided with mounting holes and are fixedly connected to the bearing body by bolts.

[0009] Preferably, the bottom end of the support body is symmetrically provided with positioning plates, and the thickness of the positioning plates is greater than the width of the positioning slot.

[0010] Preferably, an auxiliary inclined surface is provided on the inner side of the positioning plate.

[0011] Preferably, a pull slot is symmetrically provided at the middle of the front side of the support rod. The pull slot is connected to an auxiliary component, which includes a pull plate, a fastening screw, and a locking component. An auxiliary block is fixedly provided at one end of the pull plate, and a folded protrusion is integrally formed on the other side of the pull plate. The auxiliary block is adapted to and inserted into the pull slot on the front side of the support rod.

[0012] Preferably, a circular hole is provided in the folded flange, and the fastening screw is inserted through the circular hole.

[0013] Preferably, a cylindrical screw head is fixedly provided at one end of the fastening screw, and an internal thread fastening ring is provided at the other end of the fastening screw in a corresponding threaded connection.

[0014] Preferably, a locking component is provided in the internal threaded fastening ring, and the locking component locks the internal threaded fastening ring. The locking component includes a threaded cavity, a locking screw, and an auxiliary handle; wherein the threaded cavities are symmetrically arranged in the internal threaded fastening ring, and the threaded cavities are threadedly connected to the locking screws.

[0015] Preferably, two sets of threaded cavities are symmetrically arranged in the internal thread fastening ring, and an auxiliary handle is fixedly provided at one end of the locking screw.

[0016] A construction technique includes a safety protection device for deep foundation pit support in underground foundation pits. S1: First, the corner steel columns are erected at the inner corner of the foundation pit, so that the corner steel columns are in contact with the foundation pit. S2: Construct the supporting steel plate, on the one hand, tightly attach the supporting steel plate to the foundation pit, and on the other hand, tightly attach the end of the supporting steel plate to the corner steel column; S3: During the construction of the supporting steel plates, the supporting steel plates are spliced ​​one by one. Before using the fixed anchor rods to fix the supporting steel plates, it is necessary to ensure the tightness of the splicing of adjacent supporting steel plates. That is, the supporting steel plates are assisted in the construction by setting up the supporting protection auxiliary mechanism. The contact tightness between adjacent supporting steel plates is improved by the cooperation of the supporting rods, positioning plates and positioning slots. S4: The supporting steel plate is fixed by anchor bolts. For multi-layer supporting steel plates, the upper and lower adjacent supporting rods are connected by auxiliary components. The stability of the supporting rods is improved by the use of tie plates and fastening screws.

[0017] Compared with the prior art, the beneficial effects of the present invention are: This invention relates to a safety protection device for deep foundation pit support, comprising a supporting steel plate. The supporting steel plate is tightly attached to the inner wall of the foundation pit and fixed by anchor bolts. Corner steel columns are erected at the corners of the foundation pit. Positioning slots are symmetrically arranged on the supporting steel plate, and a support and protection auxiliary mechanism is also provided to stabilize the supporting steel plate. This solution primarily achieves support and protection for the foundation pit through the supporting steel plate. Furthermore, the auxiliary mechanism reinforces the support plate by coordinating the supporting rods, positioning plates, and positioning slots. Firstly, the coordinated use of the supporting rods, positioning plates, and positioning slots improves the contact tightness between adjacent supporting steel plates. Secondly, the coordinated use of the supporting rods and auxiliary components provides supplementary support to the supporting steel plate, thereby enhancing the support and protection effect on the foundation pit. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a partial structure connection of the foundation pit support safety protection device of the present invention; Figure 2 for Figure 1 Enlarged schematic diagram of the structural connection at point A; Figure 3 for Figure 1 Enlarged schematic diagram of the structural connection at point B; Figure 4 A schematic diagram of the partial structural connection of the foundation pit support safety protection device; Figure 5 This is an exploded view of the supporting protective auxiliary mechanism structure of the present invention; Figure 6 for Figure 5 Enlarged schematic diagram of the structural connection at point C; Figure 7 for Figure 5 Enlarged schematic diagram of the structural connection at point D; Figure 8 This is an exploded view of the auxiliary component structure of the present invention; Figure 9 for Figure 8 Enlarged schematic diagram of the structural connection at point E in the middle.

[0019] In the diagram: 1. Excavation pit body; 2. Supporting steel plate; 21. Positioning slot; 3. Angle steel column; 4. Fixed anchor rod; 501. Supporting frame; 502. Connecting plate seat; 503. Bearing seat; 504. Positioning plate; 505. Auxiliary inclined surface; 506. Pull-out slot; 601. Pull-out plate; 602. Folded edge protrusion plate; 604. Round hole body; 605. Fastening screw; 606. Columnar screw head; 607. Internal thread fastening ring; 701. Threaded cavity; 702. Locking screw; 703. Auxiliary handle. Detailed Implementation

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below. All other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0021] Example 1: Please refer to Figures 1-9 A safety protection device for deep foundation pit support in underground foundation pits includes a support steel plate 2, which is tightly attached to the inner wall of the foundation pit body 1 and fixed by a fixed anchor rod 4. Corner steel columns 3 are erected at the corners of the foundation pit body 1. Positioning slots 21 are symmetrically arranged on the support steel plate 2, and a support protection auxiliary mechanism is provided on the support steel plate 2 to provide stable support for the support steel plate 2.

[0022] This solution primarily utilizes supporting steel plates 2 to provide support and protection for the foundation pit 1. Furthermore, in addition to the supporting steel plates 2, auxiliary support mechanisms further reinforce the structure. Firstly, the cooperation of the supporting struts 501, positioning plates 504, and positioning slots 21 enhances the contact tightness between adjacent supporting steel plates 2. Secondly, the cooperation of the supporting struts 501 and auxiliary components provides supplementary support to the supporting steel plates 2, thereby improving the overall support and protection effect for the foundation pit 1.

[0023] According to the appendix Figure 1 and attached Figure 4As shown, during the support and protection construction of the foundation pit 1, the corner steel columns 3 are first erected at the inner corner of the foundation pit 1, so that the corner steel columns 3 are in contact with the foundation pit 1; the support steel plates 2 are then erected, on the one hand, the support steel plates 2 are tightly attached to the foundation pit 1, and on the other hand, the ends of the support steel plates 2 are tightly attached to the corner steel columns 3; that is, one corner of the corner steel column 3 is in contact with the inner corner of the foundation pit 1. During the construction of the support steel plates 2, the support steel plates 2 are spliced ​​one by one, that is, the support steel plates 2 are stacked and spliced; before using the fixed anchor rods 4 to fix the support steel plates 2, it is necessary to ensure the tightness of the splicing of adjacent support steel plates 2, that is, the support protection auxiliary mechanism is set to assist in the construction of the support steel plates 2. The contact tightness between adjacent support steel plates 2 is improved by the cooperation of the support rods 501, the positioning plates 504 and the positioning slots 21.

[0024] According to the appendix Figure 2 and appendix Figure 5-6As shown, the supporting protective auxiliary mechanism includes a supporting frame 501 and auxiliary components. Connecting plate seats 502 are symmetrically fixed at both ends of the supporting frame 501. The connecting plate seats 502 have mounting holes and are fixedly connected to the bearing seat 503 by bolts. Positioning plates 504 are symmetrically arranged at the bottom end of the bearing seat 503, and the thickness of the positioning plates 504 is greater than the width of the positioning slot 21. An auxiliary inclined surface 505 is provided on the inner side of the positioning plates 504. For the construction of the supporting steel plates 2, after placing the first supporting steel plate 2... The first support steel plate 2 is placed at the lowest end of the foundation pit 1, and then the second support steel plate 2 is erected, that is, the second support steel plate 2 is placed on top of the first support steel plate 2, and the positioning slots 21 on the two support steel plates 2 are on the same vertical line. In order to ensure that the two adjacent support steel plates 2 are in close contact, the positioning plates 504 on the bottom side of the bearing seat 503 are then inserted into the positioning slots 21 near the gap between the adjacent support steel plates 2. During the process of inserting the positioning plates 504 into the positioning slots 21, the auxiliary parts set inside the positioning plates 504 are... The inclined surface 505 provides a squeezing effect on one side of the positioning slot 21; that is, in this solution, an auxiliary inclined surface 505 is set on the inner side of the positioning plate 504. Since the thickness of the positioning plate 504 is greater than the width of the slot of the positioning slot 21, the auxiliary inclined surface 505 makes the thickness of the insertion end of the positioning plate 504 less than the width of the slot of the positioning slot 21. That is, as the positioning plate 504 is gradually inserted into the positioning slot 21, the auxiliary inclined surface 505 on the inner side of the positioning plate 504 will contact one side of the slot of the positioning slot 21, and then the bearing seat is pressed. 503. The positioning plate 504 is clamped to the positioning slot 21. During this process, the purpose of setting the auxiliary inclined surface 505 on the inner side of the positioning plate 504 is twofold. First, it squeezes one side of the slot opening of the positioning slot 21, thereby providing a pressing effect on the supporting steel plate 2, making the contact between adjacent supporting steel plates 2 more secure. Second, due to the setting of the auxiliary inclined surface 505, the thickness of the insertion end of the positioning plate 504 is less than the width of the slot opening of the positioning slot 21, making it easier for the positioning plate 504 to be inserted into the positioning slot 21, thus improving its construction convenience.

[0025] After inserting the positioning plate 504 into the positioning slot 21 on the support steel plate 2, and then pressing the bearing seat 503, the support rod 501 is fixedly connected to the bearing seat 503 by attaching the connecting plates 502 at both ends of the support rod 501 to the bearing seat 503, and then fixing them with bolts. Finally, the support steel plate 2 is fixed by the anchor rod 4. After the construction is completed, another support steel plate 2 is spliced ​​and assembled, and the same operation is performed as described above.

[0026] According to the appendix Figure 1 and attached Figure 5-9 As shown, symmetrical pull slots 506 are provided at the middle of the front side of the support rod 501. The pull slots 506 are connected to the auxiliary components, which include pull plates 601, fastening screws 605, and locking components. An auxiliary block 602 is fixedly provided at one end of the pull plate 601, and a folded flange 603 is integrally formed on the other side of the pull plate 601. The auxiliary block 602 connects with the pull slots 506 on the front side of the support rod 501. The fitting is plugged in; a circular hole 604 is provided in the folded convex plate 603, and a fastening screw 605 is inserted through the circular hole 604; a cylindrical screw head 606 is fixedly provided at one end of the fastening screw 605, and an internal thread fastening ring 607 is provided at the other end of the fastening screw 605 for a threaded connection; that is, the supporting steel plate 2 is fixed by the fixed anchor rod 4. For the multi-layer supporting steel plate 2, the upper and lower adjacent supporting rods 501 are connected by the provided auxiliary components. The use of tie plates 601 and fastening screws 605 improves the stability of the support rod 501 during construction. To further enhance the stability of the support rod 501, this solution involves further stabilizing adjacent support rods 501 by engaging the auxiliary locking block 602 at one end of the tie plate 601 into the tie-locking groove 506 on one of the support rods 501, and then securing the other tie plate 601... The auxiliary locking block 602 of the part is locked in the pull slot 506 on another adjacent support rod 501. Finally, the fastening screw 605 is inserted into the round hole 604 in the end flange protrusion 603 of one of the pull plates 601, and then passes through the round hole 604 in the end flange protrusion 603 of the other pull plate 601. Then, the internal thread fastening ring 607 is used to connect with the fastening screw 605 by thread until the internal thread fastening ring 607 is tightened.

[0027] To further improve the connection stability between the internal threaded fastening ring 607 and the fastening screw 605, this solution also includes a locking component in the internal threaded fastening ring 607. This locking component locks the internal threaded fastening ring 607 and includes a threaded cavity 701, a locking screw 702, and an auxiliary handle 703. The threaded cavities 701 are symmetrically arranged within the internal threaded fastening ring 607, and are threadedly connected to the locking screws 702. Two sets of threaded cavities 701 are symmetrically arranged within the internal threaded fastening ring 607. An auxiliary handle 703 is fixedly installed at one end of the locking screw 702; that is, after the internal threaded fastening ring 607 is tightened, the auxiliary handle 703 is used to further tighten it. The locking screw 702 is moved so that one end of the locking screw 702 presses against the side wall of the fastening screw 605 until the locking screw 702 is tightened. The purpose of setting the locking screw 702 and the auxiliary handle 703 at the end of the locking screw 702 is, on the one hand, to provide a locking function for the connection between the internal thread fastening ring 607 and the fastening screw 605; on the other hand, when the construction personnel rotate the internal thread fastening ring 607, the locking screw 702 and the auxiliary handle 703 on the internal thread fastening ring 607 can provide a corresponding auxiliary function, that is, to provide an auxiliary rotation function when the construction personnel rotate the internal thread fastening ring 607 by hand.

[0028] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A safety protection device for deep foundation pit support in underground foundation pit, comprising a support steel plate (2), wherein the support steel plate (2) is tightly attached to the inner wall of the foundation pit body (1), and the support steel plate (2) is fixed by a fixed anchor rod (4), and corner steel columns (3) are erected at the corners of the foundation pit body (1). Its features are: A positioning slot (21) is symmetrically arranged on the supporting steel plate (2), and a supporting and protective auxiliary mechanism is provided on the supporting steel plate (2) to provide stable support for the supporting steel plate (2).

2. The underground deep foundation pit support safety protection device according to claim 1, characterized in that: The supporting and protective auxiliary mechanism includes a supporting rod (501) and auxiliary components. Connecting plate seats (502) are symmetrically fixed at both ends of the supporting rod (501). The connecting plate seats (502) are provided with mounting holes, and the connecting plate seats (502) are fixedly connected to the bearing seat body (503) by bolts.

3. The safety protection device for deep foundation pit support according to claim 2, characterized in that: The bottom end of the support body (503) is symmetrically provided with positioning plates (504), and the thickness of the positioning plates (504) is greater than the groove width of the positioning slot (21).

4. The underground deep foundation pit support safety protection device according to claim 3, characterized in that: An auxiliary inclined surface (505) is provided on the inner side of the positioning plate (504).

5. The underground deep foundation pit support safety protection device according to claim 3, characterized in that: A pull slot (506) is symmetrically provided at the middle of the front side of the support rod (501). The pull slot (506) is connected to an auxiliary component. The auxiliary component includes a pull plate (601), a fastening screw (605), and a locking component. An auxiliary block (602) is fixedly provided at one end of the pull plate (601), and a folded protrusion (603) is integrally formed on the other side of the pull plate (601). The auxiliary block (602) is adapted to be inserted into the pull slot (506) on the front side of the support rod (501).

6. The safety protection device for deep foundation pit support according to claim 5, characterized in that: A circular hole (604) is provided in the folded flange (603), and the fastening screw (605) is inserted through the circular hole (604).

7. The safety protection device for deep foundation pit support according to claim 5, characterized in that: A cylindrical screw head (606) is fixedly provided at one end of the fastening screw (605), and an internal thread fastening ring (607) is provided at the other end of the fastening screw (605) in a threaded connection.

8. The safety protection device for deep foundation pit support according to claim 7, characterized in that: A locking component is provided in the internal threaded fastening ring (607), and the locking component locks the internal threaded fastening ring (607). The locking component includes a threaded cavity (701), a locking screw (702), and an auxiliary handle (703). The threaded cavity (701) is symmetrically arranged in the internal threaded fastening ring (607), and the threaded cavity (701) is threadedly connected to the locking screw (702).

9. The safety protection device for deep foundation pit support according to claim 8, characterized in that: The threaded cavity (701) has two sets symmetrically arranged in the internal threaded fastening ring (607), and an auxiliary handle (703) is fixedly provided at one end of the locking screw (702).

10. A construction process, comprising the underground foundation pit deep foundation pit support safety protection device as described in any one of claims 1-9, characterized in that: S1: First, the corner steel column (3) is erected at the inner corner of the foundation pit (1) so that the corner steel column (3) contacts the foundation pit (1); S2: The supporting steel plate (2) is constructed. On the one hand, the supporting steel plate (2) is tightly attached to the foundation pit (1). On the other hand, the end of the supporting steel plate (2) is tightly attached to the corner steel column (3). S3: During the construction of the support steel plate (2), the support steel plate (2) is spliced ​​one by one. Before fixing the support steel plate (2) with the fixed anchor rod (4), it is necessary to ensure the tightness of the splicing of the adjacent support steel plates (2). That is, the support steel plate (2) is assisted in the construction by the set support protection auxiliary mechanism. The contact tightness between the adjacent support steel plates (2) is improved by the cooperation of the support rod (501), the positioning plate (504) and the positioning slot (21). S4: The support steel plate (2) is fixed by the fixed anchor rod (4). For the multi-layer support steel plate (2), the upper and lower adjacent support rods (501) are connected by the set auxiliary components. The stability of the support rod (501) is improved by the cooperation of the tie plate (601) and the fastening screw (605).

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