Pre-buried straight thread bolt type prefabricated road plate

Abstract

The utility model relates to the technical field of building prefabricated parts, in particular to a pre-buried straight thread bolt type prefabricated road plate which is composed of a plain soil layer, a gravel layer, a medium-coarse sand layer, a waterproof plastic film and a concrete layer from bottom to top, and reinforcing steel bars and straight bolts are pre-buried in the pre-buried straight thread bolt type prefabricated road plate. The straight bolt is fixedly connected with the reinforcing steel bar, and a bolt protection device is arranged at the outer end part of the straight bolt. According to the pre-buried straight thread bolt type prefabricated road plate, a traditional pre-buried shaping steel frame is replaced by the pre-buried straight threads, so that the cost of shaping steel frame materials is saved; the straight threads at the lifting holes are well protected by arranging the protection bowls and the protection caps when the straight threads are pre-buried, so that the prefabricated road plate can obtain more turnover times.

Description

Technical Field

[0001] The utility model relates to the technical field of building precast components, and particularly relates to a precast road slab with embedded straight thread bolts. Background Technique

[0002] At present, in China, the construction of precast road slabs mostly adopts the form of pre-embedded lifting lugs in a fixed steel frame. Through the form of pre-embedding a fixed steel frame in the precast road slab, although the fixed steel frame obtains a large connection strength with the concrete by using the concrete grip force, the material cost of the pre-embedded fixed steel frame is high. At the same time, since the lifting lugs are easily damaged during turnover or use, the turnover rate is low. Therefore, to solve the above problems of the existing technology, a precast road slab with embedded straight thread bolts needs to be proposed. Content of the Utility Model

[0003] In order to solve the above problems, the utility model provides a precast road slab with embedded straight thread bolts. The precast road slab with embedded straight thread bolts replaces the traditional pre-embedded fixed steel frame with embedded straight threads, saving the cost of the fixed steel frame material; by setting protection bowls and protection caps during the embedding of the straight threads, the straight threads at the lifting holes are well protected, enabling the precast road slab to obtain more turnover times.

[0004] The technical solution of the utility model is as follows:

[0005] A precast road slab with embedded straight thread bolts is composed of a plain soil layer, a gravel layer, a medium-coarse sand layer, a waterproof plastic film, and a concrete layer from bottom to top. Reinforcing bars and straight bolts are embedded in the precast road slab with embedded straight thread bolts. The straight bolts are fixedly connected to the reinforcing bars, and a bolt protection device is arranged at the outer end of the straight bolts.

[0006] The bolt protection device includes a protection bowl, and the bowl-shaped protection bowl is sleeved on the outer end of the straight bolt with the flared opening facing outward.

[0007] The bolt protection device further includes a protection cap, and the protection cap is sleeved on the end of the straight bolt in a threaded connection with the straight bolt.

[0008] The thickness of the gravel layer is 200 mm.

[0009] The thickness of the medium-coarse sand is 50 mm.

[0010] The thickness of the waterproof plastic film is 0.7 mm.

[0011] The concrete layer is a C30 concrete layer.

[0012] The thickness of the concrete layer is 150 mm.

[0013] The pre-embedded straight thread bolt type precast road slab further includes a sleeve and a lifting ring, and the sleeve is threadedly connected to the straight bolt and the lifting ring respectively.

[0014] One straight bolt is pre-embedded at each of the four corners of the pre-embedded straight thread bolt type precast road slab.

[0015] The beneficial effects of the present utility model are as follows:

[0016] 1. A pre-embedded straight thread bolt type precast road slab disclosed by the present utility model replaces the traditional pre-embedded shaped steel frame with pre-embedded straight threads, saving the cost of shaped steel frame materials.

[0017] 2. A pre-embedded straight thread bolt type precast road slab disclosed by the present utility model protects the straight threads at the lifting holes well by setting protective bowls and protective caps when pre-embedding the straight threads, enabling the precast road slab to have more turnover times.

[0018] 3. A pre-embedded straight thread bolt type precast road slab disclosed by the present utility model generates a grip force between the concrete and the embedded parts through the pre-embedded straight threads, so that the component obtains greater connection strength.

[0019] 4. A pre-embedded straight thread bolt type precast road slab disclosed by the present utility model uses a sleeve to connect the pre-embedded straight threads and the lifting ring, thereby forming a straight thread sleeve connecting piece and obtaining greater mechanical connection strength.

[0020] 5. A pre-embedded straight thread bolt type precast road slab disclosed by the present utility model uses a round pipe rectangular adapter, making the included angle between the steel wire rope and the horizontal lifting angle of the component 90° during the lifting process, maximizing the safety factor during the lifting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] By reading the detailed description of the preferred embodiments below, the solutions and advantages of the present application will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present utility model.

[0022] In the drawings:

[0023] Figure 1 is a cross-sectional structural schematic diagram of a pre-embedded straight thread bolt type precast road slab according to an embodiment of the present utility model;

[0024] The components represented by the reference numerals in the drawings are:

[0025] The utility model: 1. Formwork, 2. Steel bars, 3. Plain soil layer, 4. Gravel layer, 5. Medium coarse sand layer, 6. Waterproof plastic film, 7. Concrete layer, 8. Protection bowl, 9. Protection cap, 10. Straight bolt. Specific implementation mode

[0026] As Figure 1 shown, the pre-embedded straight thread bolt type precast road slab is composed of a plain soil layer 3, a gravel layer 4, a medium coarse sand layer 5, a waterproof plastic film 6 and a concrete layer 7 from bottom to top; the thickness of the gravel layer is 200 mm; the thickness of the medium coarse sand is 50 mm; the thickness of the waterproof plastic film is 0.7 mm; the concrete layer is a C30 concrete layer; the thickness of the concrete layer is 150 mm.

[0027] Steel bars 2 and straight bolts 10 are pre-embedded in the pre-embedded straight thread bolt type precast road slab, the straight bolts 10 are fixedly connected with the steel bars 2, and one straight bolt 10 is pre-embedded at each of the four corners of the pre-embedded straight thread bolt type precast road slab, and a bolt protection device is arranged at the outer end of the straight bolt 10.

[0028] The bolt protection device includes a protection bowl 8, and the bowl-shaped protection bowl 8 is sleeved on the outer end of the straight bolt 10 with the flared opening facing outward.

[0029] The bolt protection device further includes a protection cap 9, and the protection cap 9 is sleeved on the end of the straight bolt 10 in a threaded connection with the straight bolt.

[0030] The pre-embedded straight thread bolt type precast road slab further includes a sleeve and a lifting ring, and the sleeve is respectively in threaded connection with the straight bolt 9 and the lifting ring.

[0031] The specific construction process flow is as follows:

[0032] 1. Subgrade setting → 2. Precast road slab steel bar formwork setting → 3. Pre-embedding straight thread bolts and protection devices → 4. Concrete pouring and curing → 5. Straight thread sleeve lifting ring connection → 6. On-site hoisting → 7. Precast road on-site assembly → 8. Hoisting hole protection → 9. Turnover and withdrawal.

[0033] The pre-embedded straight thread bolt type precast road slab generates a grip force between the concrete and the embedded parts through the pre-embedded straight thread, so that the component obtains a greater connection strength; then a sleeve is used to connect the pre-embedded straight thread and the lifting ring to form a straight thread sleeve connector, obtaining a greater mechanical connection strength; a round pipe rectangular adapter is used to make the steel wire rope and the horizontal lifting angle of the component 90° during the lifting process, maximizing the safety factor during the lifting process; by using pre-embedded straight threads instead of traditional pre-embedded shaped steel frames, the cost of the shaped steel frame materials is saved; a series of measures such as setting a protective bowl and a protective cap when pre-embedding the straight thread well protect the straight thread at the lifting hole, enabling the precast road slab to obtain more turnover times.

Claims

1. A prefabricated road slab with embedded straight thread bolts, characterized in that: From bottom to top, it is composed of a plain soil layer (3), a crushed stone layer (4), a medium-coarse sand layer (5), a waterproof plastic film (6) and a concrete layer (7). Steel bars (2) and straight bolts (10) are pre-embedded in the pre-embedded straight threaded bolt type prefabricated road slab. The straight bolts (10) are fixedly connected to the steel bars (2). A bolt protection device is provided at the outer end of the straight bolt (10), and the bolt protection device includes a protection bowl (8).

2. The prefabricated road slab with embedded straight thread bolts according to claim 1, characterized in that: The bowl-shaped bell mouth of the protective bowl (8) is mounted on the outer end of the straight bolt (10) with the mouth facing outward.

3. The prefabricated road slab with embedded straight thread bolts according to claim 2, characterized in that: The bolt protection device further comprises a protection cap (9), wherein the protection cap (9) is threadably connected to the straight bolt and sleeved on the end of the straight bolt (10).

4. The prefabricated road slab with embedded straight thread bolts according to claim 1, characterized in that: The thickness of the crushed stone layer is 200 mm.

5. The prefabricated road slab with embedded straight thread bolts according to claim 4, characterized in that: The thickness of the medium-coarse sand is 50 mm.

6. The prefabricated road slab with embedded straight thread bolts according to claim 5, characterized in that: The waterproof plastic film has a thickness of 0.7 mm.

7. The prefabricated road slab with embedded straight thread bolts according to claim 6, characterized in that: The concrete layer is a C30 concrete layer.

8. The prefabricated road slab with embedded straight thread bolts according to claim 6, characterized in that: The thickness of the concrete layer is 150 mm.

9. The prefabricated road slab with embedded straight thread bolts according to claim 1, characterized in that: It also comprises a sleeve and a lifting ring, wherein the sleeve is threadedly connected to the straight bolt (10) and the lifting ring respectively.

10. The prefabricated road slab with embedded straight thread bolts according to claim 1, characterized in that: One straight bolt (10) is pre-embedded at each of the four corners of the pre-embedded straight thread bolt type prefabricated road slab.

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