Construction structure between elevator bottom plate and raft foundation
By setting up an elevated floor and steel formwork structure between the elevator base slab and the raft foundation, the construction difficulties in the confined space were solved, concrete cracking was prevented, construction quality and seismic performance were ensured, and a convenient construction process and structural safety were achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-18
- Publication Date
- 2026-03-24
AI Technical Summary
In modern building engineering, the narrow space between the elevator base slab and the raft foundation is difficult to construct, and the concrete is prone to cracking due to excessive load, affecting quality and seismic performance.
An elevated structure is adopted, including a sand cushion layer, a leveling layer, and an isolation layer. Steel formwork and limiting joists are used, combined with tie bolts for fixation, to form a stable construction structure and avoid direct load on the concrete layer that has not reached the compressive strength.
It enables efficient construction in confined spaces, prevents concrete cracking, ensures construction convenience and structural safety, and does not affect the seismic function of the elastic sliding bearing, making subsequent cleaning easy.
Smart Images
Figure CN224031738U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to building construction technical field especially, relate to a construction structure between elevator bottom plate and raft foundation. BACKGROUND
[0002] In modern building engineering, in order to meet the requirement of anti-seismic, the elastic sliding support between elevator bottom plate and raft foundation is usually needed to set up. However, in the traditional construction method, the lower space of elevator bottom plate is narrow, and it is difficult to set up the formwork and support the formwork, leading to the great construction difficulty. In addition, if the elevator bottom plate concrete bears too large load before reaching the compressive strength, the quality problems such as concrete cracking are prone to occur. Therefore, how to efficiently construct in the narrow space and guarantee the quality of elevator bottom plate concrete is the technical problem to be solved at present. SUMMARY
[0003] In view of this, the utility model discloses a construction structure between elevator bottom plate and raft foundation, which can be constructed in a narrow space, effectively prevent the cracking of elevator bottom plate concrete caused by excessive load, and facilitate subsequent cleaning without affecting the anti-seismic function of the elastic sliding support.
[0004] In order to achieve the above-mentioned utility model purposes, the technical scheme adopted is as follows:
[0005] A construction structure between elevator bottom plate and raft foundation, comprising a raft foundation and an outer formwork, a concrete layer of elevator bottom plate is arranged on the raft foundation, an elastic sliding support is arranged between the bottom four corners of the concrete layer of elevator bottom plate and the raft foundation, an overhead layer is arranged between the concrete layer of elevator bottom plate and the raft foundation, the overhead layer comprises a sand cushion layer, a leveling layer and an isolation layer arranged in sequence from bottom to top, the outer formwork comprises a first steel formwork, a second steel formwork and a limiting keel, the first steel formwork is arranged between the circumferential inner side wall of the concrete layer of elevator bottom plate and the overhead layer, the second steel formwork and the limiting keel are arranged in sequence from inside to outside in the circumferential outer side wall of the concrete layer of elevator bottom plate, a plurality of first tension bolts are arranged between the two limiting keels arranged oppositely, and a second tension bolt is arranged between the adjacent two limiting keels.
[0006] As a further improvement of the utility model, the outer formwork further comprises a limiting formwork fixed around the outer side wall of the concrete layer of elevator bottom plate, and the limiting formwork is located on the outer side of the limiting keel, and the limiting formwork is a right-angled triangle support structure.
[0007] As a further improvement of the utility model, the concrete layer of elevator bottom plate comprises an elevator base layer and an elevator shaft support concrete column arranged at the bottom four corners of the elevator base layer.
[0008] As a further improvement of the utility model, the elevator base layer is a 300mm-thick reinforced concrete layer, and the cross section of the elevator shaft supporting concrete column is a square of 600mm*600mm.
[0009] As a further improvement of the utility model, the height of the overhead layer is 460mm, the sand cushion layer is a 440mm-thick medium-coarse sand cushion layer, the leveling layer is a 20mm-thick 1:3 cement mortar leveling layer, and the isolation layer adopts 200g / m2 polyester fiber non-woven fabric.
[0010] As a further improvement of the utility model, the limiting formwork is made of angle steel, and the bottom of the limiting formwork is fixed on the raft foundation through expansion bolts.
[0011] The utility model discloses a construction structure between elevator bottom plate and raft foundation, can construct in the narrow space, and effectively prevent the elevator bottom plate concrete from cracking due to excessive load, facilitate subsequent cleaning, do not influence the anti-seismic function of elastic sliding support, have construction convenience, structural safety and economy, have the significant technical progress and the popularization value of value. BRIEF DESCRIPTION OF DRAWINGS
[0012] The drawings constituting a part of this application are used to provide further understanding of the utility model, and the illustrative embodiment of the utility model and the explanation thereof are used to explain the utility model, and do not constitute improper limitation to the utility model. In the drawings, the utility model is shown in the drawings:
[0013] Figure 1 It is the planing drawing of overhead layer of the utility model;
[0014] Figure 2 It is the planing drawing of first and second pull bolts of the utility model;
[0015] Figure 3 It is the structural schematic view of the utility model related to the outer formwork;
[0016] Figure 4 It is the second perspective structural schematic view of the utility model related to the outer formwork.
[0017] In the drawing: 1, raft foundation, 2, outer formwork, 3, elevator bottom plate concrete layer, 4, elastic sliding support, 5, overhead layer, 6, sand cushion layer, 7, leveling layer, 8, isolation layer, 9, first steel formwork, 10, second steel formwork, 11, limiting batten, 12, first pull bolt, 13, second pull bolt, 14, limiting formwork, 15, elevator base layer, 16, elevator shaft supporting concrete column. DETAILED DESCRIPTION
[0018] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0019] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.
[0020] like Figures 1-4 As shown, a construction structure between an elevator base slab and a raft foundation includes a raft foundation 1 and an outer formwork 2. An elevator base slab concrete layer 3 is provided on the raft foundation 1. Elastic sliding supports 4 are provided between the bottom four corners of the elevator base slab concrete layer 3 and the raft foundation 1. An elevated layer 5 is provided between the elevator base slab concrete layer 3 and the raft foundation 1. The elevated layer 5 includes a sand cushion layer 6, a leveling layer 7, and an isolation layer 8 arranged sequentially from bottom to top. The outer formwork 2 includes a first steel formwork 9, a second steel formwork 10, and limiting joists 11. The first steel formwork 9 is provided between the inner sidewall of the elevator base slab concrete layer 3 and the elevated layer 5. The second steel formwork 10 and limiting joists 11 are arranged sequentially from the inside to the outside of the outer sidewall of the elevator base slab concrete layer 3. Multiple first tie bolts 12 are provided between two opposite limiting joists 11, and second tie bolts 13 are provided between two adjacent limiting joists 11.
[0021] The outer template 2 also includes a limiting template 14 fixed around the outer wall of the elevator base concrete layer 3, and the limiting template 14 is located outside the limiting keel 11. The limiting template 14 is a right-angled triangular support structure.
[0022] The elevator base concrete layer 3 includes an elevator base layer 15 and elevator shaft support concrete columns 16 located at the four corners of the bottom of the elevator base layer 15.
[0023] The elevator base 15 is a 300mm thick reinforced concrete layer, and the cross-section of the elevator shaft supporting concrete column 16 is a 600mm×600mm square.
[0024] The height of the elevated layer 5 is 460mm, the sand cushion layer 6 is a 440mm thick medium-coarse sand cushion layer 6, the leveling layer 7 is a 20mm thick 1:3 cement mortar leveling layer 7, and the isolation layer 8 is made of 200g / ㎡ polyester fiber non-woven fabric.
[0025] The limiting template 14 is made of angle steel, and the bottom of the limiting template 14 is fixed on the raft foundation 1 through expansion bolts.
[0026] The limiting keel 11 is a square steel pipe with a diameter of 50 mm.
[0027] Due to the anti-seismic requirement, the elastic sliding support 4 needs to be arranged between the elevator bottom plate and the raft foundation, so the 460mm height overhead layer 5 is arranged below the elevator bottom plate concrete layer 3, and due to the too narrow space height, the formwork and the formwork cannot be erected. Since the internal scaffold of the elevator shaft and the surrounding wall need to be constructed together with the main body, if the elevator bottom plate concrete does not reach the compressive strength requirement, the bottom plate concrete cracking and other quality accidents will be caused.
[0028] The sand cushion layer 6 is filled in the overhead layer 5, and the 20mm thick 1:3 cement mortar leveling layer 7 is constructed on the surface of the cushion layer. In order to avoid the adhesion between the elevator bottom plate concrete layer 3 and the leveling layer 7, the 200g / m2 polyester fiber non-woven fabric is arranged as the isolation layer 8 between the leveling layer 7 and the elevator bottom plate concrete layer 3.
[0029] After the elevator bottom plate concrete is poured and constructed, before the compressive strength of the concrete reaches the compressive strength, the outer formwork is not removed, the self-weight and the upper load of the elevator bottom plate concrete layer 3 are transmitted to the raft foundation 1 through the sand cushion layer 6, and the lateral pressure is borne by the outer formwork 2. It is guaranteed that the elevator bottom plate concrete will not be cracked due to the excessive load.
[0030] After the elevator bottom plate concrete layer 3 reaches the compressive strength requirement, the outer formwork 2 around the elevator bottom plate is removed, and the sand cushion layer 6 in the overhead layer 5 is cleaned out. Since the isolation layer 8 is arranged between the elevator bottom plate concrete layer 3 and the leveling layer 7, the mortar of the isolation layer 8 is also easy to peel off and clean. Therefore, the constraint material around the elastic sliding support 4 can be easily cleaned, and the anti-seismic function of the elastic sliding support 4 will not be affected.
[0031] The above only describes the preferred embodiments of the utility model, and is not used to limit the utility model. For those skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement, component disassembly or combination, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.
Claims
1. A construction structure between an elevator base slab and a raft foundation, characterized in that: The system includes a raft foundation and an outer formwork. An elevator base concrete layer is installed on the raft foundation. Elastic sliding supports are installed between the bottom four corners of the elevator base concrete layer and the raft foundation. An elevated layer is installed between the elevator base concrete layer and the raft foundation. The elevated layer includes a sand cushion layer, a leveling layer, and an isolation layer arranged sequentially from bottom to top. The outer formwork includes a first steel formwork, a second steel formwork, and limiting joists. A first steel formwork is installed between the inner circumference of the elevator base concrete layer and the elevated layer. A second steel formwork and limiting joists are arranged sequentially from the inside to the outside of the outer circumference of the elevator base concrete layer. Multiple first tie bolts are installed between two opposite limiting joists, and second tie bolts are installed between two adjacent limiting joists.
2. The construction structure between the elevator base slab and the raft foundation according to claim 1, characterized in that: The outer template also includes a limiting template fixed around the outer wall of the elevator base concrete layer, and the limiting template is located outside the limiting keel. The limiting template is a right-angled triangular support structure.
3. The construction structure between the elevator base slab and the raft foundation according to claim 1, characterized in that: The elevator base concrete layer includes the elevator base and the elevator shaft support concrete columns set at the four corners of the bottom of the elevator base.
4. The construction structure between the elevator base slab and the raft foundation according to claim 3, characterized in that: The elevator base is a 300mm thick reinforced concrete layer, and the cross-section of the concrete column supporting the elevator shaft is a 600mm×600mm square.
5. The construction structure between the elevator base slab and the raft foundation according to claim 1, characterized in that: The height of the elevated layer is 460mm, the sand cushion layer is a 440mm thick medium-coarse sand cushion layer, the leveling layer is a 20mm thick 1:3 cement mortar leveling layer, and the isolation layer is made of 200g / ㎡ polyester fiber non-woven fabric.
6. The construction structure between the elevator base slab and the raft foundation according to claim 2, characterized in that: The limiting template is made of angle steel, and the bottom of the limiting template is fixed to the raft foundation by expansion bolts.