Underground limited space inner bottom plate post-cast strip construction structure and method

Abstract

The invention discloses a bottom plate post-cast strip construction structure in an underground limited space, two sides of the bottom of a bottom plate post-cast strip groove are respectively provided with a protective moulding bed, the protective moulding beds are partially embedded into a pre-cast concrete layer on the side edge of the bottom plate post-cast strip groove, and longitudinal main ribs of the bottom plate post-cast strip groove are tightly matched with the tops of the protective moulding beds. The invention further discloses a construction method for the bottom plate post-cast strip in the underground limited space. The construction method comprises the steps that firstly, the positions of steel bars are marked; 2, laying a protective moulding bed at the marked position of the longitudinal main reinforcement, and pouring a basement bottom plate; thirdly, a reserved pipeline is installed on a basement top plate; fourthly, a supporting trolley with the width larger than that of a bottom plate post-cast strip groove is manufactured; 5, the concrete is transported into a basement through a reserved pipeline; sixthly, concrete is poured through the frustum funnel and the herringbone chute; 7, concrete is continuously poured; and 8, vibrating, pouring and maintaining. Concrete is prevented from flowing into the post-cast strip through protective layer gaps, the follow-up pouring effect is guaranteed, and the method can be widely applied to the field of building construction.

Description

Technical Field

[0001] The invention relates to the field of building construction, and in particular to a construction structure and method for a post-cast strip of a bottom plate in an underground limited space. Background Art

[0002] In longer and larger structures, post-cast strips are usually set up to avoid cracking and extrusion caused by concrete temperature. In the construction of underground slab post-cast strips, due to the setting of the slab steel bar protective layer, the concrete will flow into the post-cast strip through the gaps in the protective layer during the pouring process, resulting in a lot of concrete lumps in the post-cast strip, which are difficult to remove and are easy to damage the slab waterproof structure during the chiseling process, affecting the subsequent pouring results.

[0003] Due to the uneven settlement of the structure, the large basement post-casting zone can usually be poured and sealed only after the underground structure is completed and the above-ground structure reaches a certain height. After the basement structure is completed, it is difficult to enter the basement due to the limited space, and it is impossible to quickly pour concrete using a pump truck. If a ground pump is used for pouring, because the underground post-casting zone is usually long and the interval is large, it is necessary to constantly move and remove the pump pipe, which increases the pouring time and makes it difficult to ensure that there are no cold joints in the concrete structure in the post-casting zone.

[0004] Common basement slab post-casting belt pouring can be divided into the following two categories: Category 1: Ground pump pipe pouring, the pouring pipeline is arranged in advance according to the pouring plan. There are easy pipe blockages, and the concrete placing machine, pipelines, etc. need to be constantly removed, and the transfer volume is large. Because it is difficult to ensure the continuous pouring process, a long period of stagnation in pouring can easily cause structural cracks between the new and old concrete in the post-casting zone.

[0005] Category 2 uses bucket trucks for transportation and pouring. Due to the limited transportation volume and transportation distance, it is necessary to transport concrete back and forth continuously. At the same time, due to the influence of the uncast post-casting joint, large-scale transportation vehicles are difficult to form rapid transportation, resulting in slow concrete pouring and huge pouring and transportation workload. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the above-mentioned background technology and provide a construction structure and method for the post-cast strip of the base plate in an underground limited space, which avoids the concrete from flowing into the post-cast strip through the gap of the protective layer, ensures the subsequent pouring effect, and is more economical, efficient in transportation, high in pouring efficiency, and has a short construction period; the present invention is not only simple to operate, efficient, and cost-saving, but also ensures that the structure of the post-cast strip that is prone to water seepage is firmly connected, and at the same time meets the requirements of civilized construction and green construction on site.

[0007] The present invention provides a construction structure of a basement post-cast strip in an underground limited space, comprising a basement basement basement and a pre-cast concrete layer arranged on the basement basement basement basement, wherein the basement basement basement exposed between adjacent pre-cast concrete layers serves as a basement post-cast strip groove, a protective layer is provided at the bottom of the basement post-cast strip groove, a steel mesh is provided on the protective layer, and protective formworks arranged along the longitudinal main reinforcements are respectively provided on both sides of the bottom of the basement post-cast strip groove, wherein the protective formworks are partially embedded in the pre-cast concrete layer on the side of the basement post-cast strip groove, and the longitudinal main reinforcements at the bottom edge of the basement post-cast strip groove are tightly matched with the top of the protective formworks.

[0008] In the above technical solution, the basement top plate is provided with a plurality of vertically arranged reserved pipes corresponding to the post-cast strip grooves of the bottom plate, and the plurality of reserved pipes are arranged along the length direction of the post-cast strip grooves of the bottom plate.

[0009] In the above technical solution, a supporting trolley is provided below the multiple reserved pipes and spans the post-cast strip groove of the bottom plate. An inlet opposite to the bottom opening of the reserved pipe is provided on the top of the supporting trolley, and an outlet corresponding to the post-cast strip groove of the bottom plate is provided at the bottom of the supporting trolley inlet.

[0010] In the above technical solution, the supporting trolley has a bracket, and rollers are provided at the bottom of the bracket. The rollers are respectively located outside the two sides of the bottom plate post-casting groove. The top entrance of the supporting trolley is a frustum funnel for receiving concrete, and a chute is provided at the bottom of the frustum funnel.

[0011] In the above technical solution, the chute is a herringbone structure formed by a first chute and a second chute as a whole, wherein the top of the first chute is connected to the bottom of the frustum funnel and tilted to one side, and the top of the second chute is connected to the middle of the first chute and tilted to the other side.

[0012] In the above technical solution, the height of the protective tire mold is the same as the thickness of the protective layer.

[0013] In the above technical solution, the protective mold is a conical mortar protective mold.

[0014] In the above technical solution, the reserved pipeline is a PVC pipe.

[0015] The present invention also provides a method for constructing a post-cast strip of a base plate in an underground limited space, which comprises the following steps: step 1: according to the positions of the longitudinal main reinforcements on both sides of the boundary of the post-cast strip groove of the base plate, the lines are laid out and positioned in advance, and the contour of the post-cast strip groove of the base plate and the position of the reinforcements are marked; step 2: a protective formwork is laid at the marked position of the longitudinal main reinforcements, and the longitudinal main reinforcements on both sides of the boundary of the post-cast strip groove of the base plate are in close contact with the top of the protective formwork, so that a closed interval is formed between the protective layer and the first cast concrete layer, and the basement base plate between adjacent first cast concrete layers is cast; step 3: at the position of the post-cast strip groove of the basement top plate corresponding to the basement top plate, a pipe diameter is reserved in advance on the basement top plate template, and the pipe diameter is installed. Multiple reserved pipes, the spacing between the reserved pipes is determined according to the position of the shear wall and the column; Step 4: According to the width of the bottom plate post-casting belt groove, make a supporting trolley with a width greater than the width of the bottom plate post-casting belt groove, including a frustum funnel, a herringbone chute, a bracket and a roller; Step 5: When pouring the concrete of the bottom plate post-casting belt groove, the concrete is transported to the basement through the reserved pipe of the top plate by a concrete truck pump; Step 6: The concrete is poured into the bottom plate post-casting belt groove through the frustum funnel and the herringbone chute; Step 7: Move the supporting trolley along the bottom plate post-casting belt groove to continuously pour concrete; Step 8: Continuously vibrate during the pouring process and fully maintain after the pouring is completed.

[0016] In the above technical solution, in step 2, the height of the protective tire mold is the same as the thickness of the protective layer.

[0017] The construction structure and method of the post-cast strip of the base plate in an underground limited space of the present invention have the following beneficial effects: 1. Use protective formwork to effectively isolate the basement floor slab post-casting strip and the first poured concrete layer at the basement floor protective layer, ensuring that no concrete penetrates into the post-casting strip of the basement floor, thus avoiding the formation of hard-to-remove compaction.

[0018] 2. Set up reserved pipes in advance at the position of the basement top plate corresponding to the post-cast joint of the basement bottom plate, so that the concrete required for pouring the basement bottom plate can be transported through the reserved pipes by a concrete truck pump, thereby speeding up the concrete pouring rate and reducing the workload of concrete transportation.

[0019] 3. By supporting the trolley's herringbone chute while pouring concrete, the concrete will slow down when passing through the fork of the herringbone chute, thereby reducing the separation that is easily caused by concrete falling from a high altitude.

[0020] 4. Through the moving herringbone chute, the concrete pouring work can be carried out uninterruptedly, which can ensure the concrete pouring effect and avoid the construction cold joints caused by long stop time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of various structures at the bottom plate post-casting belt groove in the bottom plate post-casting belt construction structure in the underground limited space of the present invention; Figure 2 It is a structural front view of the post-cast strip construction structure of the bottom plate in the underground limited space of the present invention; Figure 3 It is a right side view of the structure of the post-cast strip construction structure of the bottom plate in the underground limited space of the present invention; Figure 4 It is a schematic diagram of the process of the construction method of the post-cast strip of the base plate in the underground limited space of the present invention. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments, but the embodiments should not be construed as limiting the present invention.

[0023] The present invention discloses a post-cast strip construction structure of a bottom plate in an underground limited space. For specific embodiments, please refer to the following disclosure: Example 1 See also Figure 1 The present invention provides a construction structure of a post-cast strip of a basement slab in an underground limited space, comprising a basement basement slab 1 and a pre-cast concrete layer 2 arranged on the basement basement slab 1, wherein the basement basement slab 1 exposed between adjacent pre-cast concrete layers 2 serves as a basement post-cast strip groove 3, wherein a protective layer 4 is provided at the bottom of the basement post-cast strip groove 3, wherein a steel mesh is provided on the protective layer 4, and protective formworks 6 arranged along longitudinal main reinforcements 5 are respectively provided on both sides of the bottom of the basement post-cast strip groove 3, wherein a portion of the protective formworks 6 is embedded in the pre-cast concrete layer 2 on the side of the basement post-cast strip groove 3, and the longitudinal main reinforcements 5 at the bottom edge of the basement post-cast strip groove 3 are tightly matched with the top of the protective formworks 6.

[0024] Example 2 Embodiment 2 is substantially the same as Embodiment 1, except that: See also Figures 2 to 3 The basement top plate 7 is provided with a plurality of vertically arranged reserved pipes 8 corresponding to the post-cast strip grooves 3 of the bottom plate. In one or more embodiments, the reserved pipes 8 are PVC pipes; the plurality of reserved pipes 8 are arranged along the length direction of the post-cast strip grooves 3 of the bottom plate.

[0025] A supporting trolley 9 is provided below the multiple reserved pipes 8 and spans the bottom plate post-cast strip groove 3. The top of the supporting trolley 9 is provided with an inlet opposite to the bottom opening of the reserved pipes 8, and the bottom of the inlet of the supporting trolley 9 is provided with an outlet corresponding to the bottom plate post-cast strip groove 3.

[0026] The support trolley 9 has a bracket 91, and rollers 92 are provided at the bottom of the bracket 91. The rollers 92 are respectively located outside the two sides of the bottom plate post-casting groove 3. The top entrance of the support trolley 9 is a frustum funnel 93 for receiving concrete, and a chute is provided at the bottom of the frustum funnel 93.

[0027] The chute is a herringbone structure formed by a first chute 94 and a second chute 95, wherein the top of the first chute 94 is connected to the bottom of the frustum funnel 93 and tilted to one side, and the top of the second chute 95 is connected to the middle of the first chute 94 and tilted to the other side.

[0028] The height of the protective mold 6 is the same as the thickness of the protective layer 4. In one or more embodiments, the protective mold 6 is a conical mortar protective mold.

[0029] See also Figure 4 The method for constructing a post-cast strip of a floor slab in an underground limited space of the present invention comprises the following steps: Step 1: According to the design documents, lay out the steel bars of the basement floor 1 in advance, and mark the position of the longitudinal main reinforcement 5 at the connection between the floor post-casting belt groove 3 and the first cast concrete layer 2, and lay a conical mortar protective formwork 6 below the position of the longitudinal main reinforcement 5. The bottom width of the conical mortar protective formwork 6 is not more than 50mm, and the height of the protective formwork 6 is consistent with the thickness of the protective layer 4 between the floor steel bars and the floor post-casting belt groove 3; Step 2: Install the steel bars, wherein the longitudinal main bars 5 are in close contact with the mortar formwork 2, so that the post-casting strip at the protective layer 4 of the basement floor 1 and the first cast concrete layer 2 can be effectively isolated. After the steel bars are installed, the concrete of the first cast concrete layer 2 is cast, and no concrete penetrates into the post-casting strip groove 3 of the floor; Step 3: reserve a pipe diameter of 300 mm at the position of the post-casting strip groove 3 of the basement top plate 7 corresponding to the bottom plate, and install a PVC pipe as a reserved pipe 8. The length is appropriately adjusted according to the height of the basement, and the spacing is based on the actual length of the post-casting strip. In one or more embodiments, when the length of the post-casting strip reaches 3 m, 1 to 2 reserved pipes 8 are set within the length range, and when the length of the post-casting strip reaches 6 m, 2 to 3 reserved pipes 8 are set within the length range; Step 4: According to the width of the bottom plate post-casting belt groove 3, a support trolley 9 is prepared in advance, including a cone funnel 93, a herringbone chute and a bracket 91 that are reliably fixed, and four rollers 92 are connected to the lower part of the bracket 91. The height of the bottom end of the herringbone chute from the top of the bottom plate post-casting belt groove 3 does not exceed 300mm; Step 5: When pouring the post-casting groove 3 of the bottom plate in the underground limited space, the pump pipe of the concrete truck pump 10 is inserted into the reserved pipe 8, and the concrete is transported downward through the reserved pipe 8. The concrete is collected by the frustum funnel 5, passes through the herringbone structure composed of the first chute 94 and the second chute 95, and freely slides down and is poured into the post-casting groove 3 of the bottom plate; Step 6: During the pouring process, the support trolley 9 is moved to continuously pour concrete into the bottom plate post-casting groove 3. The whole process only requires two people to cooperate to complete the continuous pouring. Step 7: Vibrate and compact the concrete and fully cure it; Step 8: Since the support trolley 9 is easy to disassemble and has a high degree of free transferability, it can be recycled after cleaning and trimming after the pouring is completed.

[0030] Innovation: 1. Conical mortar protective formwork 6 with the same height as the protective layer 4 is designed on both sides of the post-casting belt groove 3 of the bottom plate to effectively isolate the gap at the junction of the poured concrete layer 2 and the post-casting belt to avoid the infiltration of concrete due to loose compaction at this location.

[0031] 2. Design a mobile support trolley 9 with a herringbone chute to ensure continuous concrete pouring and greatly reduce the workload of concrete transportation.

[0032] 3. A PVC pipe is reserved as a reserved pipeline 8 at the position of the basement top plate 7 corresponding to the bottom plate post-casting strip groove 3 in advance. This will not affect the early construction of the basement top plate 7 post-casting strip, and can provide a concrete transportation channel for the construction of the bottom plate post-casting strip in the underground limited space.

[0033] 4. A frustum funnel 93 is provided on the top of the mobile herringbone chute, which can effectively collect the concrete transported by the reserved pipeline 8, thereby reducing the waste of concrete.

[0034] 5. The structural characteristics of the herringbone chute allow concrete to be poured on both sides of the chute at the same time, improving the pouring efficiency.

[0035] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0036] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A basement post-cast strip construction structure in an underground limited space, comprising a basement basement (1) and a pre-cast concrete layer (2) arranged on the basement basement (1), the basement basement (1) exposed between adjacent pre-cast concrete layers (2) serving as a basement post-cast strip groove (3), a protective layer (4) being provided at the bottom of the basement post-cast strip groove (3), a steel mesh being provided on the protective layer (4), and characterized in that: Both sides of the bottom of the bottom plate post-casting groove (3) are provided with protective molds (6) arranged along the longitudinal main reinforcement (5), respectively; the protective molds (6) are partially embedded in the first cast concrete layer (2) on the side of the bottom plate post-casting groove (3); the longitudinal main reinforcement (5) at the bottom edge of the bottom plate post-casting groove (3) is tightly matched with the top of the protective molds (6).

2. The underground limited space floor post-casting strip construction structure according to claim 1 is characterized in that: The basement top plate (7) is provided with a plurality of vertically arranged reserved pipes (8) corresponding to the bottom plate post-cast strip grooves (3), and the plurality of reserved pipes (8) are arranged along the length direction of the bottom plate post-cast strip grooves (3).

3. The underground limited space floor post-casting strip construction structure according to claim 2 is characterized in that: A support trolley (9) is provided below the plurality of reserved pipes (8) and straddles the bottom plate post-casting strip groove (3); an inlet is provided at the top of the support trolley (9) and is opposite to the bottom opening of the reserved pipes (8); and an outlet is provided at the bottom of the inlet of the support trolley (9) and corresponds to the bottom plate post-casting strip groove (3).

4. The underground limited space floor post-casting strip construction structure according to claim 3 is characterized in that: The support trolley (9) comprises a bracket (91), the bottom of which is provided with rollers (92), the rollers (92) being respectively located outside two sides of the bottom plate post-casting groove (3), the top entrance of the support trolley (9) being a frustum funnel (93) for receiving concrete, the bottom of which is provided with a chute.

5. The underground limited space floor post-casting strip construction structure according to claim 4 is characterized in that: The chute is a herringbone structure formed by a first chute (94) and a second chute (95), wherein the top of the first chute (94) is connected to the bottom of the frustum funnel (93) and is inclined to one side, and the top of the second chute (95) is connected to the middle of the first chute (94) and is inclined to the other side.

6. The underground limited space floor post-casting strip construction structure according to claim 5 is characterized in that: The height of the protective tire mold (6) is the same as the thickness of the protective layer (4).

7. The underground limited space floor post-casting strip construction structure according to claim 6 is characterized in that: The protective mold (6) is a conical mortar protective mold.

8. The underground limited space floor post-casting strip construction structure according to claim 7 is characterized in that: The reserved pipeline (8) is a PVC pipe.

9. A method for constructing a post-cast strip of a floor slab in an underground limited space, characterized in that: The following steps are involved: Step 1: according to the positions of the longitudinal main reinforcements (5) on both sides of the bottom plate post-casting groove (3), lay out the lines and position them in advance, and mark the contour of the bottom plate post-casting groove (3) and the positions of the reinforcements; Step 2: laying a protective formwork (6) at the marked position of the longitudinal main reinforcement (5), the longitudinal main reinforcement (5) at both sides of the bottom plate post-casting groove (3) is in close contact with the top of the protective formwork (6), so that a closed interval is formed between the protective layer (4) and the first cast concrete layer (2), and the basement bottom plate (1) between adjacent first cast concrete layers (2) is cast; Step 3: At the position of the post-cast strip groove (3) of the basement top plate (7) corresponding to the bottom plate, a pipe diameter is reserved in advance on the template of the basement top plate (7), and a plurality of reserved pipes (8) are installed. The spacing between the reserved pipes (8) is determined according to the position of the shear wall and the column; Step 4: according to the width of the bottom plate post-casting groove (3), a supporting trolley (9) having a width greater than the width of the bottom plate post-casting groove (3) is manufactured, comprising a frustum funnel (93), a herringbone chute, a bracket (91) and a roller (92); Step 5: When pouring concrete in the bottom slab post-casting groove (3), the concrete is transported to the basement through the reserved pipe (8) of the top slab by a concrete truck pump (10); Step 6: Concrete is poured into the bottom plate post-casting groove (3) through the cone funnel (93) and the herringbone chute; Step 7: Move the support trolley (9) along the bottom plate post-casting groove (3) to continuously pour concrete; Step 8: Vibrate continuously during the pouring process and fully cure after pouring is completed.

10. The method for constructing a post-cast strip of the base plate in an underground limited space according to claim 9, characterized in that: In the step 2, the height of the protective tire mold (6) is the same as the thickness of the protective layer (4).

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