A dowel bar structure for post-cast strip in deep foundation pits

Abstract

This utility model relates to a dowel bar structure for post-cast strips in deep foundation pits, including embedded anchor plates, mounting bases, bolt rods, dowel bars, and end plates. Two sets of embedded anchor plates are provided, respectively fixedly attached to the opposite end faces of the frame beams on both sides of the post-cast strip. Multiple embedded reinforcing bars are vertically fixedly connected to the side of the embedded anchor plate closest to the frame beam, and these reinforcing bars are embedded in the corresponding frame beams. The outer end face of the mounting base is fixedly connected to the side of the embedded anchor plate away from the frame beam, and the inner end face of the mounting base has a T-shaped through groove in the front-to-back direction. One end of the bolt rod is placed in the T-shaped through groove, and the other end extends inward out of the T-shaped through groove. End plates are fixedly connected to both ends of the dowel bar, and the end plates are fixedly connected to the bolt rods and attached to the inner end face of the mounting base. This design achieves rapid plug-in assembly of the dowel bar, avoiding on-site welding between the dowel bar and the embedded anchor plate, thus improving construction efficiency and the reliability of the dowel bar assembly.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, specifically to a force transmission bar structure for post-cast strips in deep foundation pits. Background Technology

[0002] Diaphragm walls and internal bracing systems for deep foundation pits are now widely used in foundation pit support construction. However, as underground structures are constructed, the existing internal bracing system hinders the construction of the main structure, necessitating its removal from the bottom up.

[0003] The replacement support system consists of three parts: the main structural beams and slabs at the same floor level, the replacement support slab strip of the foundation pit trench, and the dowel bars of the post-cast strip. Before removing the lowest internal support beam, such as... Figure 1 ( Figure 1 (This is only for demonstrating the situation when removing the internal support using existing technology). After the construction of the basement main structure beams and slabs, the replacement support plate and the post-cast strip dowel rods are completed and the concrete structure reaches the design strength, they can replace the lowest support beam to complete the foundation pit support function. Only then can the lowest internal support beam be removed.

[0004] During the removal of the internal support beams, the concrete internal support beams need to be cut and broken, which may cause displacement of the main structural beams and slabs, affecting the safety of the main structure. At the same time, to reduce concrete shrinkage, uneven settlement of the main structural beams may occur. Installing steel dowel bars at the post-cast strip beam locations to transfer horizontal loads can, to some extent, reduce structural deformation and cracking caused by the removal of internal supports, and reduce cracks and leaks caused by concrete shrinkage and uneven settlement of the main structure.

[0005] In traditional processes, the dowel bar is usually hoisted into place on site as a whole and then welded to the embedded plate on the structural beam. Due to the limited space in the basement and the weight of the components, the welding process is quite difficult, often resulting in the two ends of the dowel bar being difficult to align accurately, causing assembly difficulties, and even requiring secondary cutting or welding reinforcement. This not only results in low construction efficiency but also makes it difficult to guarantee welding quality and poses safety hazards.

[0006] Therefore, it is necessary to study a force-transfer bar structure for post-cast strips in deep foundation pits. Utility Model Content

[0007] Therefore, the purpose of this utility model is to provide a force transmission rod structure for post-cast strips in deep foundation pits, which can effectively solve the problems of low assembly efficiency and difficulty in guaranteeing welding quality of existing force transmission rod structures.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0009] A dowel bar structure for post-cast strip in deep foundation pits includes an embedded anchor plate, a mounting base, bolt rods, dowel bars, and end plates;

[0010] The pre-embedded anchor plates are provided in two sets, which are respectively fixed and attached to the opposite end faces of the frame beams on both sides of the post-cast strip;

[0011] The embedded anchor plate is vertically fixed to one side of the frame beam with multiple embedded bars, which are embedded in the corresponding frame beam.

[0012] The outer end face of the mounting base is fixedly connected to the side of the pre-embedded anchor plate away from the frame beam, and the inner end face of the mounting base is provided with a T-shaped through groove in the front-back direction.

[0013] One end of the bolt rod is set in a T-shaped through groove, and the other end extends inward out of the T-shaped through groove;

[0014] Both ends of the force transmission rod are fixedly connected to end plates, which are fixedly connected to bolt rods and fit against the inner end face of the mounting base.

[0015] Furthermore, the force transmission rod is I-shaped, including an upper edge plate, a lower edge plate, and a web plate. The upper and lower ends of the web plate are respectively vertically fixed to the upper edge plate and the lower edge plate. A through-hole is provided in the middle of the web plate.

[0016] Furthermore, multiple sets of reinforcing ribs are fixedly connected at intervals between the upper edge plate and the lower edge plate, and the reinforcing ribs are symmetrically distributed on the front and rear sides of the force transmission rod.

[0017] Furthermore, each set of reinforcing bars includes two diagonal bars arranged in a cross pattern.

[0018] Furthermore, horizontal ribs are fixedly connected between the two end plates, and the horizontal ribs are fixedly connected to the reinforcing ribs.

[0019] Furthermore, the transverse ribs are symmetrically arranged on the front and rear sides of the force transmission rod, and two sets of transverse ribs are arranged vertically and vertically on each side.

[0020] Furthermore, the end plate is provided with mounting holes corresponding to the positions of the transverse ribs; the transverse ribs pass through the mounting holes and are fixedly connected to the outer end face of the end plate by fasteners.

[0021] Furthermore, the end plate is provided with an elongated hole corresponding to the position of the bolt rod, with the length of the elongated hole being in the vertical direction.

[0022] The beneficial effects of the above technical solution are:

[0023] This utility model constructs a segmented, mechanically connected force transmission rod structure by setting up a pre-embedded anchor plate, mounting base, bolt rod, force transmission rod, and end plate. The pre-embedded anchor plate can be pre-connected to the frame beam, and the end plate can be pre-welded to the force transmission rod. The mounting base is fixedly set on the pre-embedded anchor plate. One end of the bolt rod is set in a T-shaped through groove, and the other end extends inward to connect with the end plate through a T-shaped through groove, realizing the quick plug-in assembly of the force transmission rod. This avoids on-site welding operations between the force transmission rod and the pre-embedded anchor plate, avoiding hidden dangers such as false welds and cracks caused by factors such as limited working space and uncontrollable weld quality. It improves the reliability of structural connection and construction safety, effectively solving the problems of low assembly efficiency and difficulty in guaranteeing welding quality in existing force transmission rod structures, and improving construction efficiency and the reliability of force transmission rod assembly. Attached Figure Description

[0024] Figure 1 This is a schematic diagram illustrating the removal of internal supports in existing technology.

[0025] Figure 2 This is a front sectional view of the present invention;

[0026] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0027] Figure 4 This is a part drawing of the end plate.

[0028] Attached reference numerals: 1 is embedded anchor plate, 2 is mounting base, 3 is bolt rod, 4 is force transmission rod, 5 is end plate, 6 is frame beam, 7 is reinforcing bar, 8 is horizontal bar, 9 is post-cast strip, 10 is fastener, 11 is diaphragm wall, 12 is replacement support plate, 13 is basement structural exterior wall, 14 is basement frame beam, 15 is post-cast strip force transmission rod, 16 is basement raft slab, 17 is internal support, 101 is embedded bar, 201 is T-shaped through groove, 401 is upper edge plate, 402 is lower edge plate, 403 is web plate, 404 is connecting hole, 501 is mounting hole, 502 is elongated hole. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0030] This embodiment aims to provide a force transmission rod structure for post-cast strips in deep foundation pits, addressing the problems of low assembly efficiency and difficulty in guaranteeing welding quality in existing force transmission rod structures.

[0031] A dowel bar structure for post-cast strips in deep foundation pits, such as Figure 2 It includes a pre-embedded anchor plate 1, a mounting base 2, a bolt rod 3, a force transmission rod 4, and an end plate 5.

[0032] Two sets of pre-embedded anchor plates 1 are provided, which are fixedly attached to the opposite end faces of the frame beams 6 on both sides of the post-cast strip 9. Multiple pre-embedded reinforcing bars 101 are vertically welded to the side of the pre-embedded anchor plate 1 closest to the frame beam 6. The pre-embedded reinforcing bars 101 are pre-embedded in the corresponding frame beam 6 to fix the pre-embedded anchor plate 1 to the frame beam 6.

[0033] like Figure 3 The outer end face of the mounting base 2 is welded to the side of the embedded anchor plate 1 away from the frame beam 6, with the outer direction being away from the post-pouring strip 9, which is the area between the two frame beams 6. At least four sets of mounting bases 2 are provided, located at the four end areas of the embedded anchor plate 1. There should be a gap between the mounting bases 2 to facilitate the flow of grout when pouring concrete into the post-pouring strip 9. The inner end face of the mounting base 2 has a T-shaped through groove 201 in the front-to-back direction, with the inner direction facing the post-pouring strip 9. In this embodiment, the mounting base 2 is a bent sheet metal part.

[0034] One end of the bolt rod 3 is set in the T-shaped through groove 201, that is, the bolt head of the bolt rod 3 enters the T-shaped through groove 201 from the side and cannot be vertically removed from the T-shaped through groove 201; the other end of the bolt rod 3 extends inward out of the T-shaped through groove 201.

[0035] Both ends of the force transmission rod 4 are welded and fixedly connected to end plates 5, which can be pre-welded on the ground, such as... Figure 4 The end plate 5 has an elongated hole 502 corresponding to the position of the bolt rod 3. The other end of the bolt rod 3 passes through the elongated hole 502 and is fixedly connected to the end plate 5 by a nut. The elongated hole 502 is vertical, allowing the force transmission rod 4 to be adjusted vertically, and can moderately absorb and absorb the uneven settlement difference of the main structure on both sides of the post-pouring strip 9.

[0036] During on-site installation, the bolt rod 3 needs to be inserted into the slot of the end plate 5 in advance. Then, the force transmission rod 4 and the end plate 5 are hoisted to the designated position. The end plate 5 is aligned with the pre-embedded anchor plate 1 from the front and back, so that the bolt head of the bolt rod 3 enters the T-shaped through groove 201 from the side. After the alignment is completed, the nut on the bolt rod 3 is tightened to achieve the fixed connection between the force transmission rod 4 and the pre-embedded anchor plate 1.

[0037] The dowel bar 4 is I-shaped, including an upper edge plate 401, a lower edge plate 402, and a web plate 403, and can be made of appropriately sized I-beams. The upper edge plate 401 and the lower edge plate 402 are vertically fixed to the upper and lower ends of the web plate 403, respectively. In this embodiment, the dowel bar 4 can be directly used as the skeleton structure of the post-cast strip 9. The web plate 403 has through holes 404 spaced apart in the middle to facilitate communication between the two sides of the web plate 403 during the later pouring of the post-cast strip 9, thereby improving the flow of concrete and enhancing the uniformity of concrete distribution on both sides of the web plate 403.

[0038] The web 403 has through holes 404 spaced apart in the middle. These holes should be installed according to construction standards and should not affect the mechanical properties of the force transmission rod 4. Additional reinforcing structures can be added if necessary. In this embodiment, multiple sets of reinforcing ribs 7 are welded and fixedly connected between the upper edge plate 401 and the lower edge plate 402 at intervals. The reinforcing ribs 7 are symmetrically distributed on the front and rear sides of the force transmission rod 4. Each set of reinforcing ribs 7 includes two diagonally intersecting ribs to form an additional supporting structure between the upper edge plate 401 and the lower edge plate 402, thereby enhancing the mechanical properties of the force transmission rod 4. Furthermore, the reinforcing ribs 7 can also be used as a skeleton structure during the later pouring of the post-pouring strip 9 to form a skeleton for the concrete structure on both sides of the web 403.

[0039] A horizontal rib 8 is fixedly connected between the two end plates 5. The horizontal rib 8 is symmetrically arranged on the front and rear sides of the force transmission rod 4, and two sets of horizontal rib 8 are arranged vertically on each side. The horizontal rib 8 is welded or tied to the reinforcing rib 7 to connect the various reinforcing ribs 7 into a whole. This can not only improve the stability of the reinforcing rib 7 and prevent the reinforcing rib 7 from shifting and shaking, but also improve the lateral tensile strength of the overall structure.

[0040] like Figure 4 The end plate 5 has an installation corresponding to the position of the horizontal rib 8. The horizontal rib 8 passes through the installation hole 501 and is fixedly connected to the outer end face of the end plate 5 through the fastener 10. The two ends of the horizontal rib 8 have external threads. The fastener 10 is a nut. The fastener 10 is located in the gap between the end plate 5 and the pre-embedded anchor plate 1 due to the thickness of the mounting seat 2.

Claims

1. A deep foundation pit post-cast strip force transmission rod structure, characterized in that: This includes embedded anchor plates, mounting bases, bolt rods, force transmission rods, and end plates; The pre-embedded anchor plates are provided in two sets, which are respectively fixed and attached to the opposite end faces of the frame beams on both sides of the post-cast strip; The embedded anchor plate is vertically fixed to one side of the frame beam with multiple embedded bars, which are embedded in the corresponding frame beam. The outer end face of the mounting base is fixedly connected to the side of the pre-embedded anchor plate away from the frame beam, and the inner end face of the mounting base is provided with a T-shaped through groove in the front-back direction. One end of the bolt rod is set in a T-shaped through groove, and the other end extends inward out of the T-shaped through groove; Both ends of the force transmission rod are fixedly connected to end plates, which are fixedly connected to bolt rods and fit against the inner end face of the mounting base.

2. The deep foundation pit post-cast strip force transmission rod structure according to claim 1, characterized in that: The force transmission rod is I-shaped and includes an upper edge plate, a lower edge plate, and a web plate. The upper and lower ends of the web plate are respectively vertically fixed to the upper edge plate and the lower edge plate. A through hole is provided in the middle of the web plate.

3. The deep foundation pit post-cast strip force transmission rod structure according to claim 2, characterized in that: Multiple sets of reinforcing ribs are fixedly connected at intervals between the upper and lower edge plates, and the reinforcing ribs are symmetrically distributed on the front and rear sides of the force transmission rod.

4. The post-cast strip force transmission bar structure for deep foundation pits according to claim 3, characterized in that: Each set of reinforcing bars includes two diagonal bars arranged in a cross pattern.

5. The post-cast strip force transmission bar structure for deep foundation pits according to claim 4, characterized in that: A horizontal bar is fixedly connected between the two end plates, and the horizontal bar is fixedly connected to the reinforcing bar.

6. The post-cast strip force transmission bar structure for deep foundation pits according to claim 5, characterized in that: The horizontal ribs are symmetrically arranged on the front and rear sides of the force transmission rod, and two sets of horizontal ribs are arranged at intervals on each side.

7. The post-cast strip force transmission bar structure for deep foundation pits according to claim 6, characterized in that: The end plate has mounting holes corresponding to the positions of the transverse ribs; the transverse ribs pass through the mounting holes and are fixedly connected to the outer end face of the end plate by fasteners.

8. A deep foundation pit post-cast strip force transmission bar structure according to any one of claims 1-7, characterized in that: The end plate has an elongated hole corresponding to the position of the bolt rod, with the length of the elongated hole in the vertical direction.

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